CN113028836A - Method and system for controlling discharge of hydrogen chloride and sulfur dioxide by sintering source - Google Patents

Method and system for controlling discharge of hydrogen chloride and sulfur dioxide by sintering source Download PDF

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Publication number
CN113028836A
CN113028836A CN202110419717.XA CN202110419717A CN113028836A CN 113028836 A CN113028836 A CN 113028836A CN 202110419717 A CN202110419717 A CN 202110419717A CN 113028836 A CN113028836 A CN 113028836A
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flue gas
gas channel
channel
flue
sintering
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CN113028836B (en
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李俊杰
魏进超
曾辉
胡兵
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Zhongye Changtian International Engineering Co Ltd
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Zhongye Changtian International Engineering Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0028—Regulation
    • F27D2019/0031—Regulation through control of the flow of the exhaust gases

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Treating Waste Gases (AREA)

Abstract

A method for controlling the discharge of hydrogen chloride and sulfur dioxide from a sintering source comprises dividing a wind box below a sintering trolley into 3 sections; wherein, the flue gas belonging to each air box of the first section is conveyed to a large flue; the flue gas belonging to each air box of the second section is respectively conveyed to a large flue or a desulfurization system; the flue gas of each air box belonging to the third section is respectively conveyed to a dechlorination system or a desulfurization system; the invention is adopted to treat the sintering flue gas, reduces the discharge of hydrogen chloride and sulfur dioxide from the source, controls the concentration of the hydrogen chloride entering the downstream process, improves the utilization rate of the hydrogen chloride and the sulfur dioxide, and ensures the operation safety of the downstream process and equipment.

Description

Method and system for controlling discharge of hydrogen chloride and sulfur dioxide by sintering source
Technical Field
The invention relates to treatment of sintering flue gas, in particular to a method and a system for controlling chlorine and sulfur emission at a sintering source, and belongs to the field of sintering flue gas treatment.
Background
The sintering process is a high-energy-consumption and high-pollution concentration link in the steel process, the amount of discharged waste gas accounts for 40 percent of the total waste gas amount in the steel industry (the amount of flue gas per hour reaches million standard cubic meters), and SO in the flue gasx、NOxThe emission of pollutants such as ultrafine particles (PM10), persistent organic matters, heavy metals and the like is in the head of the steel industry, and the pollutants are also the main emission source of hydrogen chloride gas. In recent years, with the requirement of ultralow emission, the method for deeply treating the sintering flue gas with ultra-large flue gas amount and heavy pollutants and realizing ultralow emission and resource utilization of the pollutants is the key point in the field of steel and iron. The currently and generally applied active carbon two-stage adsorption process and the semi-dry method and SCR combined process belong to a typical tail end flue gas treatment technology, can achieve standard emission, but have the problems of high investment and high operating cost. Based on the characteristics of the sintering process, the release characteristics of pollutants, such as SO, are different at different positions along the sintering running direction2HCl is released in a centralized way at the rear section in sintering, the method has the characteristics of high pollutant concentration and low flue gas quantity, the flue gas is difficult to treat in a centralized way, the treatment cost is greatly reduced compared with that of the tail end, the investment and the operation cost are greatly reduced, and NO is reduced in the tail end treatmentxThe removal of (a) will be more efficient.
Disclosure of Invention
According to the invention, through researching the release rule of hydrogen chloride and sulfur dioxide in the sintering process, SO suitable for different concentrations is developed2The method and the system for treating the HCl flue gas can accurately reduce HCl and SO in the iron ore sintering process2The purpose of discharging. The initial stage of the sintering flue gas emission is controlled, the problem that hydrogen chloride and sulfur dioxide are not independently treated in advance in the conventional sintering process is solved, and the aim of removing the hydrogen chloride and the sulfur dioxide in the original flue gas in advance is fulfilled.
In accordance with a first embodiment of the present invention, a method for controlling hydrogen chloride and sulfur dioxide emissions from a sintering source is provided.
A method for controlling hydrogen chloride and sulfur dioxide emissions from a sintering source, the method comprising the steps of:
1) paving sintering raw materials on a sintering trolley, igniting and sintering, wherein j air boxes are arranged below the sintering trolley, and numbered from the head of a sintering machine, namely a1 st air box, a2 nd air box and a … … th j air box in sequence; discharging sintering flue gas through an air box;
2) dividing the bellows into 3 sections according to the running direction of the sintering trolley, wherein the first section comprises 1 st bellows to g th bellows, the second section comprises (g +1) th bellows to h th bellows, and the third section comprises (h +1) th bellows to j th bellows; wherein, the flue gas belonging to each air box of the first section is conveyed to a large flue through a respective flue gas channel; the flue gas belonging to each air box of the second section is conveyed to a desulfurization system through respective flue gas channels; the flue gas of each air box belonging to the third section is conveyed to a dechlorination system through a respective flue gas channel; wherein: g is j/2 to 2j/3, h is 3j/4 to 4 j/5; rounding up j/2, 2j/3, 3j/4 and 4 j/5;
3) carrying out desulfurization treatment on the air box flue gas conveyed to the desulfurization system to obtain desulfurization tail gas, and conveying the desulfurization tail gas to a dechlorination system;
4) carrying out dechlorination treatment on the desulfurized tail gas conveyed to the dechlorination system and the flue gas of the air box to obtain dechlorinated tail gas, and conveying the dechlorinated tail gas to the large flue;
5) and (3) conveying the air box flue gas and the dechlorination tail gas in the large flue to a flue gas treatment system for flue gas purification treatment.
Preferably, step 2) is dividing the windboxes into 5 sections, the first section comprising the 1 st to (g-a) th windboxes, the second section comprising the (g-a +1) th to (g + a) th windboxes, the third section comprising the (g + a +1) th to (h-a) th windboxes, the fourth section comprising the (h-a +1) th to (h + a) th windboxes, the fifth section comprising the (h + a +1) th to j-th windboxes; wherein, the flue gas belonging to each air box of the first section is conveyed to a large flue through a respective flue gas channel; the flue gas of each air box belonging to the second section is respectively and independently conveyed to a large flue or a desulfurization system through respective flue gas channels and switching valves on the corresponding flue gas channels in a switchable manner; the flue gas belonging to each bellows of the third section is conveyed to a desulfurization system through a respective flue gas channel; the flue gas of each air box belonging to the fourth section is respectively and independently conveyed to a desulfurization system or a dechlorination system in a switchable manner through respective flue gas channels and switching valves on the corresponding flue gas channels; the flue gas of each air box belonging to the fifth section is conveyed to a dechlorination system through a respective flue gas channel; wherein: a is 1 to 5, preferably 2 to 4; (h-g) > 2 a; g is more than a; (j-h) > a.
Preferably, the wind boxes comprise wind box bodies and flue gas channels, and the flue gas channel connected with the wind boxes in the second section is provided with an SO2 concentration detector and a switching valve.
Preferably, a flue gas channel connected with the wind box of the fourth section is provided with an HCl concentration detector and a switching valve.
Preferably, the SO2 concentration detector detects SO in the sintering flue gas discharged by the second section wind box in real time2Judging the SO in the sintering flue gas discharged by the air box2Whether the concentration of (b) reaches the pretreatment target value a: if the bellows discharges SO in the sintering flue gas2If the concentration of the smoke reaches the pre-treatment target value a, the smoke discharged by the air box is introduced into the large flue through the switching valve; if the bellows discharges SO in the sintering flue gas2When the concentration of the flue gas reaches the pre-treatment target value a, the flue gas discharged by the air box is introduced into a desulfurization system through a switching valve; wherein: a is 200mg/Nm3。
Preferably, the HCl concentration detector detects the concentration of HCl in the sintering flue gas discharged from the wind box in the fourth section in real time, and determines whether the concentration of HCl in the sintering flue gas discharged from the wind box reaches a processing target value b: if the concentration of HCl in the sintering flue gas discharged by the air box does not reach the treatment target value b, introducing the flue gas discharged by the air box into a desulfurization system through a switching valve; if the concentration of HCl in the sintering flue gas discharged by the air box reaches a treatment target value b, introducing the flue gas discharged by the air box into a dechlorination system through a switching valve; wherein: b is 10mg/Nm3。
Preferably, SO in flue gas in adjacent flue gas channels in the windbox is set2The rate of change of concentration is k1：
Figure BDA0003027344420000021
In the formula, k1SO of ith flue gas channel2The concentration is based on SO in the last flue gas channel2The rate of change of concentration; c. CiIs SO in the flue gas in the ith flue gas channel2Concentration in mg/Nm3；ci-1Is SO in the flue gas in the (i-1) th flue gas channel2Concentration in mg/Nm3(ii) a L is the length of the branch pipe air box and is m; n is the number of the air boxes connected with the smoke channels; i is more than or equal to 1 and less than or equal to n; and when i is 1, (i-1) is the last flue gas channel connected with the previous air box.
Preferably, the flue gas belonging to each wind box of the second section is independently conveyed to the large flue or the desulfurization system through the switching valves on the respective flue gas channels and the corresponding flue gas channels in a switchable manner, and the method specifically comprises the following steps: the SO2 concentration detector detects SO in flue gas in each flue gas channel connected with each air box in the second section in real time2Calculating the SO in the flue gas in each flue gas channel2Rate of change of concentration k1Judgment of k1A positive value and a negative value;
a) if k is positive, compare ciAnd a:
a1) if c isiA is more than or equal to a, the flue gas conveyed by the flue gas channel connected with each air box in the second section from the beginning of the flue gas channel to the back is introduced into a desulfurization system, and SO in the flue gas in the previous flue gas channel is detected2The content of (A);
a2) if c isiIf < a, introducing the flue gas conveyed by all the flue gas channels from the beginning to the front of the flue gas channel into a large flue, and detecting SO in the flue gas in the next flue gas channel2The content of (A);
b) if k is 0, compare ciAnd a:
b1) if c isiA is more than or equal to a, the flue gas conveyed by the flue gas channel is introduced into a desulfurization system, and SO in the flue gas in the previous flue gas channel and the next flue gas channel is detected2The content of (A);
b2) if c isiIf < a, then willThe flue gas conveyed by the flue gas channel is introduced into a large flue and SO in the flue gas in the next flue gas channel is detected2The content of (A);
c) if k is negative, compare ciAnd a:
c1) if c isiA is larger than or equal to a, the flue gas conveyed by the flue gas channel is introduced into a desulfurization system, and SO in the flue gas in the next flue gas channel is detected2The content of (A);
c2) if c isiIf < a, the flue gas conveyed by the flue gas channel is introduced into a large flue, and SO in the flue gas in the previous flue gas channel is detected2The content of (a).
Preferably, each wind box belonging to the fourth section is connected with n flue gas channels; each flue gas channel is correspondingly and independently provided with an HCl concentration detector, and each flue gas channel can respectively and independently convey flue gas to a desulfurization system or a dechlorination system in a switchable manner through a switching valve; n is 1 to 5, preferably 2 to 4.
Preferably, the change rate of HCl concentration in the flue gas in the adjacent flue gas channels in the wind box is set to be k2：
Figure BDA0003027344420000031
In the formula, k2The change rate of the HCl concentration of the pth flue gas channel is based on the HCl concentration in the last flue gas channel; c. CpThe HCl concentration in the flue gas in the p-th flue gas channel is in mg/Nm3；cp-1The HCl concentration in the flue gas in the (p-1) th flue gas channel is in mg/Nm3(ii) a L is the length of the branch pipe air box and is m; n is the number of the air boxes connected with the smoke channels; p is more than or equal to 1 and less than or equal to n; when p is 1, (p-1) is the last flue gas channel connected with the previous air box.
Preferably, the flue gas belonging to each wind box of the fourth section is independently conveyed to the desulfurization system or the dechlorination system in a switchable manner through the respective flue gas channel and the switching valve on the corresponding flue gas channel, which specifically comprises: the HCl concentration detector detects in real time each cigarette connected with each air box in the fourth sectionThe content of HCl in the flue gas in the gas channel is calculated, and the change rate k of the HCl concentration in the flue gas in each flue gas channel is calculated2Judgment of k2A positive value and a negative value;
a) if k is2Positive, compare ciAnd b:
a1) if c isiB, introducing the flue gas conveyed by all the flue gas channels from the beginning to the end of the flue gas channel to a dechlorination system, and detecting the content of HCl in the flue gas in the previous flue gas channel;
a2) if c isiIf the number of the sections is less than b, introducing the flue gas conveyed by the flue gas channel connected with each air box in the fourth section from the beginning of the flue gas channel to the front into a desulfurization system, and detecting the content of HCl in the flue gas in the next flue gas channel;
b) if k is2Is 0, compare ciAnd b:
b1) if c isiB, introducing the flue gas conveyed by the flue gas channel into a dechlorination system, and detecting the content of HCl in the flue gas in the previous flue gas channel and the flue gas in the next flue gas channel;
b2) if c isiIf the content of HCl in the flue gas channel is less than b, introducing the flue gas conveyed by the flue gas channel into a large flue, and detecting the content of HCl in the flue gas in the next flue gas channel;
c) if k is2Is negative, compare ciAnd b:
c1) if c isiB, introducing the flue gas conveyed by the flue gas channel into a dechlorination system, and detecting the content of HCl in the flue gas in the next flue gas channel;
c2) if c isiIf the number of the smoke channels is less than b, the smoke conveyed by the smoke channel is introduced into a large flue, and the content of HCl in the smoke in the previous smoke channel is detected.
Preferably, before the flue gas conveyed to the desulfurization system enters the desulfurization system, the flue gas is uniformly mixed by a first flue gas mixer and then enters the desulfurization system; before the flue gas conveyed to the dechlorination system enters the dechlorination system, the flue gas is uniformly mixed by a second flue gas mixer and then enters the dechlorination system; j is 12 to 48, preferably 18 to 42, more preferably 20 to 36.
In accordance with a second embodiment of the present invention, a system for controlling hydrogen chloride and sulfur dioxide emissions from a sintering source is provided.
A system for controlling the discharge of hydrogen chloride and sulfur dioxide from a sintering source comprises a sintering machine, a desulfurization system, a dechlorination system and a flue gas treatment system. Wherein: the sintering machine comprises a sintering trolley, an air box and a large flue. The plurality of air boxes are arranged below the sintering trolley in parallel and are numbered as the 1 st air box, the 2 nd air box and the … … th air box in sequence; the air box comprises an air box body and a flue gas channel; wherein: the 1 st wind box to the g th wind box are connected to a large flue through respective flue gas channels, the (g +1) th wind box to the h th wind box are connected to a desulfurization system through respective flue gas channels, and the (h +1) th wind box to the j th wind box are connected to a dechlorination system through respective flue gas channels; the tail end of the large flue is connected to a flue gas treatment system. Wherein: g is j/2 to 2j/3, h is 3j/4 to 4 j/5; j/2, 2j/3, 3j/4, 4j/5 are rounded.
Preferably, j wind boxes are arranged below the sintering trolley in parallel and are numbered as the No. 1 wind box, the No. 2 wind box and the No. … … j wind box in sequence; the 1 st to (g-a) th windboxes are connected to a large flue through respective flue gas channels, the (g-a +1) th to (g + a) th windboxes are respectively and independently connected to the large flue and a desulfurization system through respective flue gas channels and switching valves arranged on the flue gas channels in a switchable manner, the (g + a +1) th to (h-a) th windboxes are connected to the desulfurization system through respective flue gas channels, the (h-a +1) th to (h + a) th windboxes are respectively and independently connected to the desulfurization system and a dechlorination system through respective flue gas channels and switching valves arranged on the flue gas channels in a switchable manner, and the (h + a +1) th to jth windboxes are connected to the dechlorination system through respective flue gas channels; wherein: a is 1 to 5, preferably 2 to 4; (h-g) > 2 a; g is more than a; (j-h) > a.
Preferably, the (g-a +1) th wind box to the (g + a) th wind box are connected with n flue gas channels, and each flue gas channel is correspondingly provided with SO2Concentration detector and diverter valve.
Preferably, the (h-a +1) th wind box to the (h + a) th wind box are connected with n flue gas channels, and each flue gas channel is correspondingly provided with an HCl concentration detector and a switching valve;
preferably, n is 1 to 5; more preferably 2-4.
In the invention, the system also comprises a first flue gas mixer and a second flue gas mixer, wherein a flue gas channel connected to the desulfurization system is firstly connected to the first flue gas mixer, and an air outlet of the first flue gas mixer is connected to an air inlet of the desulfurization system; the flue gas channel connected to the dechlorination system is connected to the second flue gas blending device, and the air outlet of the second flue gas blending device is connected to the air inlet of the dechlorination system.
Preferably, the gas outlet of the desulfurization system is connected to the gas inlet of the dechlorination system; the air outlet of the dechlorination system is connected with the large flue.
Preferably, the flue gas treatment system comprises a dust remover, an exhaust fan, a flue gas purification system and a chimney.
In the invention, j wind boxes are arranged at the bottom of the sintering trolley in parallel, and are numbered as the 1 st wind box, the 2 nd wind box and the … … th wind box in sequence along the movement direction of the sintering trolley. After the system starts to operate, HCl and SO are added into each air box2And (5) detecting the concentration. SO was detected due to uncertainty in the sintering end point2The amount released at the initial stage of sintering (1 st to g th windboxes) was small, the middle windboxes (g +1 th to h th windboxes) started to release concentratedly, and thereafter, slowly decreased, and the amount released at the end windboxes (h +1 th to j th windboxes) continued to decrease, but at a higher concentration than at the front windboxes. HCl is released less in the early stage of sintering (1 st to h th windboxes), and the middle and rear windboxes (h +1 th to j th windboxes) start to release intensively and continue to be in the higher stage. Wherein g is j/2 to 2j/3, and h is 3j/4 to 4 j/5; j/2, 2j/3, 3j/4, 4j/5 are rounded.
In the present invention, reference SO2The release profile of HCl at a different location. In the initial stage of sintering, SO2The emission concentration of HCl is lower, and SO is generated along with the progress of sintering2Firstly, a large amount of HCl is released in SO with the highest concentration reaching the percentage level2After the release of a large amount of the raw materials is finished, the raw materials are released and are maintained until the sintering is finished,the highest concentration is hundreds mg/Nm3Several bellows at the sintering tail, albeit SO2The emission is remarkably reduced, but SO2Concentration is of the order of magnitude of that of HCl, and SO is released during the initial release of HCl2At the peak of release, the concentration is very different. The hydrogen chloride content of the tail air box is at the peak value, SO2The content is lower and is in the same order of magnitude as that of hydrogen chloride; in the middle and rear part of the bellows, hydrogen chloride begins to be released in large quantity, SO2The concentration starts to decrease, but SO2The concentration is much higher than the hydrogen chloride concentration.
In the present invention, according to the above HCl and SO2The discharge rule of (2) divides the sintering bellows into a first section, a second section and a third section. Wherein the first section comprises 1 st wind box to g th wind box, and sintering flue gas HCl and SO in the wind boxes2The content is extremely low, and the part of flue gas directly enters a large flue. The second section comprises (g +1) th air box to h-th air box, and sintering flue gas in the air boxes contains a large amount of SO2And a small amount of HCl, and the part of the flue gas enters a desulfurization system. The third section comprises (h +1) th wind box to jth wind box, and the flue gas contains a large amount of HCl and a relatively small amount of SO2At this time, HCl and SO2And the flue gas enters a dechlorination system in the same order of magnitude.
Preferably, HCl and SO are due to uncertainty in the sintering end point2Is uncertain. The invention adopts the switching valve to flexibly adjust the trend of the air box branch pipe. According to HCl and SO in each bellows2The trend of the air box branch pipe is changed according to the concentration and the concentration change rate of the air box branch pipe. The number of bellows belonging to the first, second and third sections will vary accordingly.
In the present invention, as a preferred embodiment, according to HCl and SO2The discharge rule of (2) divides the sintering bellows into five parts, namely a first section, a second section, a third section, a fourth section and a fifth section. Wherein the first segment comprises 1 st wind box to (g-a) th wind box, and sintering flue gas HCl and SO in the wind boxes of the first segment2The content is extremely low, and sintering flue gas directly enters a large flue. The second oneThe section comprising the (g-a +1) th windbox to the (g + a) th windbox, the section SO2Starting to release, and detecting SO in the sintering flue gas2The flue gas channel is provided with a switching valve, and SO in the sintering flue gas is used as the concentration of the sintering flue gas2And introducing sintering flue gas in the air box into a desulfurization system when the concentration begins to rise. The third section comprising the (g + a +1) th windbox to the (h-a) th windbox, this section SO2And (4) releasing a large amount of sintering flue gas in the air box of the section, and introducing the sintering flue gas into a desulfurization system. The fourth section comprises the (h-a +1) th to (h + a) th windboxes, this section SO2And after a large amount of HCl is released, HCl begins to be released, the concentration of HCl in the sintering flue gas is detected, a switching valve is arranged on a flue gas channel, and the sintering flue gas in the air box is introduced into a dechlorination system when the concentration of HCl in the sintering flue gas begins to rise. The fifth section comprises (h + a +1) th wind box to the jth wind box, HCl in the fifth section is released in a large amount, and sintering flue gas in the wind boxes in the fifth section is introduced into a dechlorination system.
Preferably, the desulfurization system adopts dry desulfurization, and the function is to remove high-concentration SO in the sintering flue gas2And a small amount of HCl. The desulfurization system adopts an activated carbon adsorbent or other adsorbents with the same functions. Dechlorination system adopts alkaline substances such as magnesium oxide, calcium oxide, and sodium bicarbonate.
In the present invention, the desulfurization system and the dechlorination system are separately arranged. The desulfurization tower adopts an active carbon dry desulfurization technology to adsorb SO2The activated carbon can be sent to a downstream flue gas purification desorption tower for regeneration, SO that SO can be realized2The complete resource utilization of the raw materials is realized. The dechlorination system can improve the purity of the byproduct calcium chloride and realize the secondary utilization of the chloride.
In the invention, SO in each flue gas channel in a certain air box is measured2Concentration and calculating SO in adjacent flue gas channels2Concentration change rate k of1. From SO2Concentration and SO2The trend of the sintering flue gas is judged by two angles of the concentration change rate. SO can be more accurately treated2High-concentration sintering flue gas and SO2And separating sintering flue gas with low concentration. Wherein SO is set2Is aimed at passing k1And SO2Concentration ciJudging whether the current flue gas channel is in SO state2The position of the air box in the releasing process is further deduced to further deduce the trend of all the air to the internal sintering flue gas, SO that the detection of SO in all the air boxes is avoided2The concentration of (c).
In the present invention, if k is in a certain windbox1A positive value indicates SO in the windbox2The concentration gradually increases. Then judging SO in each flue gas channel in the air box2The concentration of (c). If c in the windboxiAre all less than a or c in the windboxiExtremely greater than a, respectively, the flue gas passage is at SO2The release process is carried out at SO2Before release. If c isiIf a is larger than a, the flue gas channel is in SO2The release process is carried out at SO2After the start of the bulk release or the substantial release completion phase.
In the present invention, if k is in a certain windbox1The value is 0. Then to SO in the flue gas channel2And (5) judging the concentration. If c isiIf a is larger than a, the flue gas channel is in SO2The release process is carried out at SO2A bulk release phase. If all the flue gas channels c in the air boxiAll are less than a, the flue gas channel is in SO2The release process is carried out at SO2Before release. The SO in the sintering flue gas in the next air box needs to be detected and judged2And (4) concentration.
In the present invention, if k is in a certain windbox1The value is negative. Then SO in each flue gas channel in the wind box2And (5) judging the concentration. If c is in a certain flue gas channeliIf a is larger than a, the flue gas channel is in SO2The release process is carried out at SO2If the smoke channel is c after the release is basically finishediIf the value is less than a, SO in the flue gas channel2The concentration is lower, and the latter smoke channel is detected.
In the invention, the HCl concentration in each flue gas channel in a certain air box is measured, and the change rate k of the HCl concentration in the adjacent flue gas channels is calculated2. And judging the trend of the sintering flue gas from two angles of HCl concentration and HCl concentration change rate. The sintering flue gas with high HCl concentration can be more accurately separated from the sintering flue gas with low HCl concentration. Wherein, it is provided withTarget concentration b of HCl is determined so as to pass k2And HCl concentration ciThe position of the current flue gas channel in the HCl release process is judged, the trend of all wind toward the inner sintering flue gas is further deduced, and the detection of the HCl concentration in all the flue gas channels is avoided.
In the present invention, if k is in a certain windbox2Positive values indicate a gradual increase in HCl concentration in the windbox. And then judging the concentration of HCl in each flue gas channel in the air box. If c in the windboxiAre all less than b or c in the windboxiVery much greater than b, the flue gas channel is located before the HCl release process. If c isiAnd b is larger than the first threshold value, the flue gas channel is positioned in the HCl releasing process at a stage after HCl is released in a large amount or after HCl is released basically.
In the present invention, if k is in a certain windbox2The value is 0. And then judging the concentration of HCl in the flue gas channel. If c isiAnd if the value is larger than b, the position of the flue gas channel in the HCl release process is an HCl large-amount release stage. If all the flue gas channels c in the air boxiAll are less than b, the flue gas channel is located before HCl is released in the HCl releasing process. And (4) detecting and judging the HCl concentration in the sintering flue gas in the next air box.
In the present invention, if k is in a certain windbox2The value is negative. And then judging the HCl concentration in each flue gas channel in the air box. If c is in a certain flue gas channeliIf the position of the flue gas channel in the HCl release process is more than b, if the position of the flue gas channel in a certain flue gas channel is c after HCl release is basically finishediAnd if the concentration of HCl in the flue gas channel is less than b, detecting the next flue gas channel.
In the present invention, the length of the sintering machine is 20 to 200m, preferably 24 to 180m, and more preferably 30 to 150 m. The width of the sintering machine is 2 to 20m, preferably 3 to 15m, more preferably 4 to 10 m.
In the present invention, the number of windboxes (i.e., the value of j) is 12 to 48, preferably 14 to 42, and more preferably 16 to 36.
Compared with the prior art, the invention has the following beneficial effects:
1. the emission of hydrogen chloride and sulfur dioxide is reduced from the source, the concentration of the hydrogen chloride and the sulfur dioxide entering the downstream flue gas purification process is controlled, and the running safety of downstream processes and equipment is ensured.
2. Through the sectional treatment of the sintering flue gas, the hydrogen chloride and the sulfur dioxide are respectively and independently collected and separately treated, so that the dechlorination and desulfurization costs are effectively reduced, and the hydrogen chloride and the sulfur dioxide in the flue gas can be completely recycled.
3. By researching the release rules of hydrogen chloride and sulfur dioxide in the sintering flue gas, the method for judging the release point of the sulfur dioxide and further deducing the content of the sulfur dioxide in the sintering flue gas in each air box is summarized, the concentration of the sulfur dioxide in each air box is prevented from being detected, and the cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a system for controlling hydrogen chloride and sulfur dioxide emissions from a sintering source according to the present invention;
FIG. 2 is a schematic structural view of a single windbox corresponding to a plurality of flue gas ducts in the present invention;
FIG. 3 is a schematic view of the flue gas treatment system of the present invention;
FIG. 4 is a diagram illustrating the determination of SO in the wind box according to the present invention2A schematic flow chart of a first case in concentration;
FIG. 5 is a diagram illustrating the determination of SO in the wind box according to the present invention2A schematic flow chart of a second case in concentration;
FIG. 6 is a diagram illustrating the determination of SO in the wind box according to the present invention2A schematic flow chart of a third case in concentration;
FIG. 7 is a schematic flow chart illustrating the first case of determining HCl concentration in the wind box according to the present invention;
FIG. 8 is a schematic flow chart illustrating the second case of determining HCl concentration in the wind box according to the present invention;
FIG. 9 is a schematic flow chart illustrating a third aspect of determining HCl concentration in a wind box according to the present invention;
reference numerals:
a: sintering machine; 1: sintering the trolley; 2: an air box; 201: a bellows body; 202: a flue gas channel; 203: SO (SO)2Concentration ofA detector; 204: an HCl concentration detector; 205: a switching valve; 3: a large flue; 4: a first flue gas mixer; 5: a second flue gas mixer; 6: a flue gas treatment system; 601: an electrostatic precipitator; 602: a main exhaust fan; 603: a flue gas purification system; 604: a chimney; 7: a desulfurization system; 8: a dechlorination system.
Detailed Description
In accordance with a first embodiment of the present invention, a method for controlling hydrogen chloride and sulfur dioxide emissions from a sintering source is provided.
A method for controlling hydrogen chloride and sulfur dioxide emissions from a sintering source, the method comprising the steps of:
1) paving sintering raw materials on a sintering trolley 1, igniting and sintering, wherein j air boxes 2 are arranged below the sintering trolley 1, and numbered from the head of a sintering machine, namely, the 1 st air box, the 2 nd air box and the … … th air box in sequence; the sintering flue gas is discharged through the air box 2;
2) dividing the bellows into 3 sections according to the running direction of the sintering trolley 1, wherein the first section comprises 1 st bellows to g th bellows, the second section comprises (g +1) th bellows to h th bellows, and the third section comprises (h +1) th bellows to j th bellows; wherein, the flue gas belonging to each wind box 2 of the first section is conveyed to the large flue 3 through the respective flue gas channel 202; the flue gas belonging to each wind box 2 of the second section is conveyed to the desulfurization system 7 through a respective flue gas channel 202; the flue gas belonging to each wind box 2 of the third section is conveyed to a dechlorination system 8 through a respective flue gas channel 202; wherein: g is j/2 to 2j/3, h is 3j/4 to 4 j/5; rounding up j/2, 2j/3, 3j/4 and 4 j/5;
3) carrying out desulfurization treatment on the air box flue gas conveyed to the desulfurization system 7 to obtain desulfurization tail gas, and conveying the desulfurization tail gas to a dechlorination system 8;
4) carrying out dechlorination treatment on the desulfurized tail gas and the flue gas of the air box which are conveyed to the dechlorination system 8 to obtain dechlorinated tail gas, and conveying the dechlorinated tail gas to the large flue 3;
5) and (3) conveying the air box flue gas and dechlorination tail gas in the large flue 3 to a flue gas treatment system for flue gas purification treatment.
Preferably, step 2) is dividing the windboxes into 5 sections, the first section including the 1 st to g-a th windboxes, the second section including the (g-a +1) th to (g + a) th windboxes, the third section including the (g + a +1) th to (h-a) th windboxes, the fourth section including the (h-a +1) th to (h + a) th windboxes, and the fifth section including the (h + a +1) th to j-th windboxes; wherein, the flue gas belonging to each wind box 2 of the first section is conveyed to the large flue 3 through the respective flue gas channel 202; the flue gas belonging to each wind box 2 of the second section is respectively and independently conveyed to the large flue 3 or the desulfurization system 7 through the respective flue gas channel 202 and the switching valve 204 on the corresponding flue gas channel 202 in a switchable manner; the flue gas belonging to each wind box 2 of the third section is conveyed to a desulfurization system 7 through a respective flue gas channel 202; the flue gas belonging to each wind box 2 of the fourth section is respectively and independently conveyed to the desulfurization system 7 or the dechlorination system 8 through the respective flue gas channel 202 and the switching valve 204 on the corresponding flue gas channel 202 in a switchable manner; the flue gas belonging to each wind box 2 of the fifth section is conveyed to a dechlorination system 8 through a respective flue gas channel 202; wherein: a is 1 to 5, preferably 2 to 4; (h-g) > 2 a; g is more than a; (j-h) > a.
Preferably, the wind boxes 2 each comprise a wind box body 201 and a flue gas channel 202, and the flue gas channel 202 connected to the wind box in the second section is provided with an SO2 concentration detector 203 and a switching valve 205.
Preferably, a flue gas channel 202 connected with the wind box of the fourth section is provided with an HCl concentration detector 204 and a switching valve 205.
Preferably, the SO2 concentration detector 203 detects the SO in the sintering flue gas discharged by the second segment wind box in real time2Judging the SO in the sintering flue gas discharged by the air box2Whether the concentration of (b) reaches the pretreatment target value a: if the bellows discharges SO in the sintering flue gas2If the concentration of the flue gas reaches the pre-treatment target value a, the flue gas discharged by the wind box is introduced into the large flue 3 through the switching valve 204; if the bellows discharges SO in the sintering flue gas2When the concentration of the flue gas reaches the pre-treatment target value a, the flue gas discharged by the air box is introduced into the desulfurization system 7 through the switching valve 204;
wherein:a is 200mg/Nm3。
Preferably, the HCl concentration detector 204 detects the concentration of HCl in the sintering flue gas discharged from the wind box in the fourth section in real time, and determines whether the concentration of HCl in the sintering flue gas discharged from the wind box reaches the processing target value b: if the concentration of HCl in the sintering flue gas discharged by the air box does not reach the treatment target value b, introducing the flue gas discharged by the air box into a desulfurization system 7 through a switching valve 204; if the concentration of HCl in the sintering flue gas discharged by the wind box reaches the treatment target value b, introducing the flue gas discharged by the wind box into a dechlorination system 8 through a switching valve 204;
wherein: b is 10mg/Nm3。
Preferably, each wind box belonging to the second section is connected to n flue gas channels 202; SO is respectively and independently arranged on each flue gas channel2 A concentration detector 203, each of the flue gas channels independently transmits flue gas to the large flue 3 or the desulfurization system 7 through a switching valve 205 in a switchable manner; n is 1 to 5, preferably 2 to 4.
In the invention, the SO in the flue gas in the adjacent flue gas channels in the air box is set2The rate of change of concentration is k1：
Figure BDA0003027344420000101
In the formula, k1SO of ith flue gas channel2The concentration is based on SO in the last flue gas channel2The rate of change of concentration; c. CiIs SO in the flue gas in the ith flue gas channel2Concentration in mg/Nm3；ci-1Is SO in the flue gas in the (i-1) th flue gas channel2Concentration in mg/Nm3(ii) a L is the length of the branch pipe air box and is m; n is the number of the air boxes connected with the smoke channels; i is more than or equal to 1 and less than or equal to n; and when i is 1, (i-1) is the last flue gas channel connected with the previous air box.
In the present invention, the flue gas belonging to each wind box 2 of the second section is independently transported to the large flue 3 or to the desulfurization system 7 through the respective flue gas channel 202 and the switching valve 204 on the corresponding flue gas channel 202 in a switchable manner, which specifically comprises:
the SO2 concentration detector 203 detects SO in flue gas in each flue gas channel connected with each wind box in the second section in real time2Calculating the SO in the flue gas in each flue gas channel2Rate of change of concentration k1Judgment of k1A positive value and a negative value;
a) if k is positive, compare ciAnd a:
a1) if c isiA is more than or equal to a, the flue gas conveyed by the flue gas channel connected with each air box in the second section from the beginning of the flue gas channel to the back is introduced into a desulfurization system 7, and SO in the flue gas in the previous flue gas channel is detected2The content of (A);
a2) if c isiIf < a, the flue gas conveyed by all the flue gas channels from the beginning to the front of the flue gas channel is introduced into a large flue 3, and SO in the flue gas in the next flue gas channel is detected2The content of (A);
b) if k is 0, compare ciAnd a:
b1) if c isiA is more than or equal to a, the flue gas conveyed by the flue gas channel is introduced into a desulfurization system 7, and SO in the flue gas in the previous flue gas channel and the next flue gas channel is detected2The content of (A);
b2) if c isiIf < a, the flue gas conveyed by the flue gas channel is introduced into a large flue 3, and SO in the flue gas in the next flue gas channel is detected2The content of (A);
c) if k is negative, compare ciAnd a:
c1) if c isiA is more than or equal to a, the flue gas conveyed by the flue gas channel is introduced into a desulfurization system 7, and SO in the flue gas in the next flue gas channel is detected2The content of (A);
c2) if c isiIf < a, the flue gas conveyed by the flue gas channel is introduced into a large flue 3, and SO in the flue gas in the previous flue gas channel is detected2The content of (a).
In the invention, each wind box belonging to the fourth section is connected with n flue gas channels 202; each flue gas channel 202 is correspondingly and independently provided with an HCl concentration detector 204, and each flue gas channel respectively and independently conveys flue gas to the desulfurization system 7 or the dechlorination system 8 in a switchable manner through a switching valve 205; n is 1 to 5, preferably 2 to 4.
Preferably, the change rate of HCl concentration in the flue gas in the adjacent flue gas channels in the wind box is set to be k2：
Figure BDA0003027344420000111
In the formula, k2The change rate of the HCl concentration of the pth flue gas channel is based on the HCl concentration in the last flue gas channel; c. CpThe HCl concentration in the flue gas in the p-th flue gas channel is in mg/Nm3；cp-1The HCl concentration in the flue gas in the (p-1) th flue gas channel is in mg/Nm3(ii) a L is the length of the branch pipe air box and is m; n is the number of the air boxes connected with the smoke channels; p is more than or equal to 1 and less than or equal to n; when p is 1, (p-1) is the last flue gas channel connected with the previous air box.
Preferably, the flue gas belonging to each wind box 2 of the fourth section is independently conveyed to the desulfurization system 7 or to the dechlorination system 8 through the switching valve 204 on the flue gas channel 202 and the flue gas channel 202, which are specifically:
the HCl concentration detector 204 detects the content of HCl in flue gas in each flue gas channel connected with each bellows in the fourth section in real time, and calculates the change rate k of the HCl concentration in the flue gas in each flue gas channel2Judgment of k2A positive value and a negative value;
a) if k is2Positive, compare ciAnd b:
a1) if c isiB, introducing the flue gas conveyed by all the flue gas channels from the beginning to the end of the flue gas channel to a dechlorination system 4, and detecting the content of HCl in the flue gas in the previous flue gas channel;
a2) if c isiIf the number of the sections is less than b, introducing the flue gas conveyed by the flue gas channel connected with each air box in the fourth section from the beginning of the flue gas channel to the front into a desulfurization system 7, and detecting the content of HCl in the flue gas in the next flue gas channel;
b) if k is2Is 0 toC is compared withiAnd b:
b1) if c isiB, introducing the flue gas conveyed by the flue gas channel into a dechlorination system 4, and detecting the content of HCl in the flue gas in the previous flue gas channel and the flue gas in the next flue gas channel;
b2) if c isiIf the content of HCl in the flue gas channel is less than b, the flue gas conveyed by the flue gas channel is introduced into a large flue 3, and the content of HCl in the flue gas in the next flue gas channel is detected;
c) if k is2Is negative, compare ciAnd b:
c1) if c isiB, introducing the flue gas conveyed by the flue gas channel into a dechlorination system 4, and detecting the content of HCl in the flue gas in the next flue gas channel;
c2) if c isiIf the number of the smoke channels is less than b, the smoke conveyed by the smoke channel is introduced into the large flue 3, and the content of HCl in the smoke in the previous smoke channel is detected. 12. The method according to any one of claims 1-11, wherein: before the flue gas conveyed to the desulfurization system 7 enters the desulfurization system 7, the flue gas is uniformly mixed by the first flue gas mixer 4 and then enters the desulfurization system 7; before the flue gas conveyed to the dechlorination system 8 enters the dechlorination system 8, the flue gas is uniformly mixed by the second flue gas mixer 5 and then enters the dechlorination system 8; and/or
j is 12 to 48, preferably 18 to 42, more preferably 20 to 36.
In accordance with a second embodiment of the present invention, a system for controlling hydrogen chloride and sulfur dioxide emissions from a sintering source is provided.
A system for controlling the discharge of hydrogen chloride and sulfur dioxide from a sintering source comprises a sintering machine A, a desulfurization system 7, a dechlorination system 8 and a flue gas treatment system 6. Wherein: the sintering machine A comprises a sintering trolley 1, an air box 2 and a large flue 3. The plurality of air boxes 2 are arranged below the sintering trolley 1 in parallel and are numbered as the 1 st air box, the 2 nd air box and the … … th air box in sequence; the bellows comprises a bellows body 201 and a flue gas channel 202; wherein: the 1 st to the g th windboxes are connected to the large flue 3 through respective flue gas channels 202, the (g +1) th to the h th windboxes 2 are connected to the desulfurization system 7 through respective flue gas channels 202, and the (h +1) th to the j th windboxes are connected to the dechlorination system 8 through respective flue gas channels 202; the end of the large flue 3 is connected to a flue gas treatment system. Wherein: g is j/2 to 2j/3, h is 3j/4 to 4 j/5; j/2, 2j/3, 3j/4, 4j/5 are rounded.
Preferably, j wind boxes 2 are arranged below the sintering trolley 1 in parallel and numbered as the 1 st wind box, the 2 nd wind box and the … … th wind box in sequence; the 1 st to g-a th windboxes are connected to the large flue 3 through respective flue gas channels 202, the (g-a +1) th to (g + a) th windboxes are respectively and independently connected to the large flue 3 and the desulfurization system 7 through respective flue gas channels 202 and switching valves 204 provided on the flue gas channels 202 in a switchable manner, the (g + a +1) th to (h-a) th windboxes are connected to the desulfurization system 7 through respective flue gas channels 202, the (h-a +1) th to (h + a) th windboxes are respectively and independently connected to the desulfurization system 7 and the dechlorination system 8 through respective flue gas channels 202 and switching valves 204 provided on the flue gas channels 202 in a switchable manner, and the (h + a +1) th to jth windboxes are connected to the dechlorination system 8 through respective flue gas channels 202;
wherein: a is 1 to 5, preferably 2 to 4; (h-g) > 2 a; g is more than a; (j-h) > a.
Preferably, the (g-a +1) th to (g + a) th wind boxes are connected with n flue gas channels 202, and each flue gas channel is correspondingly provided with SO2 A concentration detector 203 and a switching valve 205.
Preferably, the (h-a +1) th wind box to the (h + a) th wind box are connected with n flue gas channels 202, and each flue gas channel is correspondingly provided with an HCl concentration detector 204 and a switching valve 205;
preferably, n is 1 to 5; more preferably 2-4.
Preferably, the system further comprises a first flue gas mixer 4 and a second flue gas mixer 5, wherein a flue gas channel 202 connected to the desulfurization system 7 is firstly connected to the first flue gas mixer 4, and an air outlet of the first flue gas mixer 4 is connected to an air inlet of the desulfurization system 7; the flue gas channel 202 connected to the dechlorination system 8 is connected to the second flue gas mixer 5, and the air outlet of the second flue gas mixer 5 is connected to the air inlet of the dechlorination system 8.
Preferably, the gas outlet of the desulfurization system 7 is connected to the gas inlet of the dechlorination system 8; the air outlet of the dechlorination system 8 is connected with the large flue 3. The flue gas treatment system 6 comprises a dust remover 601, an exhaust fan 602, a flue gas purification system 603 and a chimney 604.
Example 1
A system for controlling the discharge of hydrogen chloride and sulfur dioxide from a sintering source comprises a sintering machine A, a desulfurization system 7, a dechlorination system 8 and a flue gas treatment system 6. Wherein: the sintering machine A comprises a sintering trolley 1, an air box 2 and a large flue 3. The 30 wind boxes 2 are arranged below the sintering trolley 1 in parallel and are numbered as the No. 1 wind box, the No. 2 wind box and the No. 30 wind box of … … in sequence; the bellows comprises a bellows body 201 and a flue gas channel 202; wherein: the 1 st to 17 th windboxes are connected to the large flue 3 through respective flue gas channels 202, the 18 th to 24 th windboxes 2 are connected to the desulfurization system 7 through respective flue gas channels 202, and the 25 th to 30 th windboxes are connected to the dechlorination system 8 through respective flue gas channels 202. The end of the large flue 3 is connected to a flue gas treatment system.
Example 2
A system for controlling the discharge of hydrogen chloride and sulfur dioxide from a sintering source comprises a sintering machine A, a desulfurization system 7, a dechlorination system 8 and a flue gas treatment system 6. Wherein: the sintering machine A comprises a sintering trolley 1, an air box 2 and a large flue 3. The 30 air boxes 2 are arranged below the sintering trolley 1 in parallel and are numbered as the 1 st air box, the 2 nd air box and the … … 30 th air box in sequence; the 1 st to 15 th windboxes are connected to the large flue 3 through respective flue gas passages 202, the 16 th to 19 th windboxes are respectively and independently connected to the large flue 3 and the desulfurization system 7 through respective flue gas passages 202 and switching valves 204 provided on the flue gas passages 202 in a switchable manner, the 20 th to 22 th windboxes are connected to the desulfurization system 7 through respective flue gas passages 202, the 23 rd to 26 th windboxes are respectively and independently connected to the desulfurization system 7 and the dechlorination system 8 through respective flue gas passages 202 and switching valves 204 provided on the flue gas passages 202 in a switchable manner, and the 27 th to 30 th windboxes are connected to the dechlorination system 8 through respective flue gas passages 202. The end of the large flue 3 is connected to a flue gas treatment system.
Example 3
Example 2 was repeated except that the 16 th to 19 th wind boxes were connected to 4 flue gas channels 202, each provided with SO2 A concentration detector 203 and a switching valve 205; the 23 rd wind box to the 26 th wind box are all connected with 4 flue gas channels 202, and each flue gas channel is correspondingly provided with an HCl concentration detector 204 and a switching valve 205.
Example 4
The embodiment 3 is repeated, except that the system further comprises a first flue gas mixer 4 and a second flue gas mixer 5, the flue gas channel 202 connected to the desulfurization system 7 is firstly connected to the first flue gas mixer 4, and the air outlet of the first flue gas mixer 4 is connected to the air inlet of the desulfurization system 7; the flue gas channel 202 connected to the dechlorination system 8 is connected to the second flue gas mixer 5, and the air outlet of the second flue gas mixer 5 is connected to the air inlet of the dechlorination system 8. The air outlet of the desulfurization system 7 is connected to the air inlet of a dechlorination system 8; the air outlet of the dechlorination system 8 is connected with the large flue 3. The flue gas treatment system 6 comprises a dust remover 601, an exhaust fan 602, a flue gas purification system 603 and a chimney 604.
Example 5
A method of controlling hydrogen chloride and sulfur dioxide emissions from a sintering source using the system of example 4, the method comprising the steps of:
1) paving sintering raw materials on a sintering trolley 1, igniting and sintering, wherein 30 air boxes 2 are arranged below the sintering trolley 1, and numbered from the head of a sintering machine, namely a1 st air box, a2 nd air box and a … … th 30 th air box in sequence; the sintering flue gas is discharged through the air box 2;
2) dividing the windboxes into 3 sections according to the running direction of the sintering trolley 1, wherein the first section comprises 1 st to 17 th windboxes, the second section comprises 18 th to 24 th windboxes, and the third section comprises 25 th to 30 th windboxes; wherein, the flue gas belonging to each wind box 2 of the first section is conveyed to the large flue 3 through the respective flue gas channel 202; the flue gas belonging to each wind box 2 of the second section is conveyed to the desulfurization system 7 through a respective flue gas channel 202; the flue gas belonging to each wind box 2 of the third section is conveyed to a dechlorination system 8 through a respective flue gas channel 202;
3) carrying out desulfurization treatment on the air box flue gas conveyed to the desulfurization system 7 to obtain desulfurization tail gas, and conveying the desulfurization tail gas to a dechlorination system 8;
4) carrying out dechlorination treatment on the desulfurized tail gas and the flue gas of the air box which are conveyed to the dechlorination system 8 to obtain dechlorinated tail gas, and conveying the dechlorinated tail gas to the large flue 3;
5) and (3) conveying the air box flue gas and dechlorination tail gas in the large flue 3 to a flue gas treatment system for flue gas purification treatment.
Example 6
Example 5 was repeated except that step 2) was performed by dividing the windboxes into 5 segments, the first segment comprised the 1 st to 15 th windboxes, the second segment comprised the 16 th to 19 th windboxes, the third segment comprised the 20 th to 22 th windboxes, the fourth segment comprised the 23 rd to 26 th windboxes, and the fifth segment comprised the 27 th to 30 th windboxes; wherein, the flue gas belonging to each wind box 2 of the first section is conveyed to the large flue 3 through the respective flue gas channel 202; the flue gas belonging to each wind box 2 of the second section is respectively and independently conveyed to the large flue 3 or the desulfurization system 7 through the respective flue gas channel 202 and the switching valve 204 on the corresponding flue gas channel 202 in a switchable manner; the flue gas belonging to each wind box 2 of the third section is conveyed to a desulfurization system 7 through a respective flue gas channel 202; the flue gas belonging to each wind box 2 of the fourth section is respectively and independently conveyed to the desulfurization system 7 or the dechlorination system 8 through the respective flue gas channel 202 and the switching valve 204 on the corresponding flue gas channel 202 in a switchable manner; the flue gases belonging to each windbox 2 of the fifth section are conveyed to the dechlorination system 8 through a respective flue gas channel 202.
Example 7
Example 6 is repeated except that the wind boxes 2 each include a wind box body 201 and a flue gas channel 202, and the flue gas channel 202 connected to the wind box in the second section is provided with an SO2 concentration detector 203 and a switching valve 205; a flue gas channel 202 connected with the wind box of the fourth section is provided with an HCl concentration detector 204 and a switching valve 205.
Example 8
Example 7 was repeated except that the SO2 concentration detector 203 was used to detect SO in the sintering flue gas discharged from the windbox in the second zone in real time2Judging the SO in the sintering flue gas discharged by the air box2Whether the concentration of (b) reaches the pretreatment target value a:
if the bellows discharges SO in the sintering flue gas2If the concentration of the flue gas reaches the pre-treatment target value a, the flue gas discharged by the wind box is introduced into the large flue 3 through the switching valve 204;
if the bellows discharges SO in the sintering flue gas2When the concentration of the flue gas reaches the pre-treatment target value a, the flue gas discharged by the air box is introduced into the desulfurization system 7 through the switching valve 204;
wherein: a is 200mg/Nm 3.
Example 9
Example 7 was repeated except that the HCl concentration detector 204 detected the HCl concentration in the sintering flue gas discharged from the fourth segment wind box in real time, and determined whether the HCl concentration in the sintering flue gas discharged from the wind box reached the processing target value b:
if the concentration of HCl in the sintering flue gas discharged by the air box does not reach the treatment target value b, introducing the flue gas discharged by the air box into a desulfurization system 7 through a switching valve 204;
if the concentration of HCl in the sintering flue gas discharged by the wind box reaches the treatment target value b, introducing the flue gas discharged by the wind box into a dechlorination system 8 through a switching valve 204;
wherein: b is 10mg/Nm 3.
Example 10
Example 8 was repeated except that each windbox belonging to the second section was connected to 4 flue gas channels 202; SO is respectively and independently arranged on each flue gas channel2And a concentration detector 203, wherein each flue gas channel independently conveys flue gas to the large flue gas channel 3 or the desulfurization system 7 through a switching valve 205 in a switchable manner.
Example 11
Example 10 was repeated except that SO in the flue gas in the adjacent flue gas passages in the windbox was set2The rate of change of concentration is k1：
Figure BDA0003027344420000161
In the formula, k1SO of ith flue gas channel2The concentration is based on SO in the last flue gas channel2The rate of change of concentration; c. CiIs SO in the flue gas in the ith flue gas channel2Concentration in mg/Nm3；ci-1Is SO in the flue gas in the (i-1) th flue gas channel2Concentration in mg/Nm3(ii) a L is the length of the branch pipe air box and is m; n is the number of the air boxes connected with the smoke channels; i is more than or equal to 1 and less than or equal to n; and when i is 1, (i-1) is the last flue gas channel connected with the previous air box.
Example 12
Example 11 is repeated, except that the flue gas belonging to each wind box 2 of the second section is independently conveyed to the large flue 3 or to the desulfurization system 7 through the respective flue gas channel 202 and the switching valve 204 on the corresponding flue gas channel 202 in a switchable manner, which specifically comprises:
the SO2 concentration detector 203 detects SO in flue gas in each flue gas channel connected with each wind box in the second section in real time2Calculating the SO in the flue gas in each flue gas channel2Rate of change of concentration k1Judgment of k1A positive value and a negative value;
a) if k is positive, compare ciAnd a:
a1) if c isiA is more than or equal to a, the flue gas conveyed by the flue gas channel connected with each air box in the second section from the beginning of the flue gas channel to the back is introduced into a desulfurization system 7, and SO in the flue gas in the previous flue gas channel is detected2The content of (A);
a2) if c isiIf < a, the flue gas conveyed by all the flue gas channels from the beginning to the front of the flue gas channel is introduced into a large flue 3, and SO in the flue gas in the next flue gas channel is detected2The content of (A);
b) if k is 0, compare ciAnd a:
b1) if c isiA is more than or equal to a, the flue gas channel is conveyedThe flue gas is introduced into a desulfurization system 7, and SO in the flue gas in the previous flue gas channel and the flue gas in the next flue gas channel are detected2The content of (A);
b2) if c isiIf < a, the flue gas conveyed by the flue gas channel is introduced into a large flue 3, and SO in the flue gas in the next flue gas channel is detected2The content of (A);
c) if k is negative, compare ciAnd a:
c1) if c isiA is more than or equal to a, the flue gas conveyed by the flue gas channel is introduced into a desulfurization system 7, and SO in the flue gas in the next flue gas channel is detected2The content of (A);
c2) if c isiIf < a, the flue gas conveyed by the flue gas channel is introduced into a large flue 3, and SO in the flue gas in the previous flue gas channel is detected2The content of (a).
Example 13
Example 9 was repeated except that each windbox belonging to the fourth section was connected to 4 flue gas channels 202; each flue gas channel 202 is provided with an HCl concentration detector 204 independently, and each flue gas channel independently conveys flue gas to the desulfurization system 7 or to the dechlorination system 8 in a switchable manner through a switching valve 205.
Example 14
Example 13 was repeated except that the change rate of HCl concentration in the flue gas in the adjacent flue gas passages in the windbox was set to k2：
Figure BDA0003027344420000171
In the formula, k2The change rate of the HCl concentration of the pth flue gas channel is based on the HCl concentration in the last flue gas channel; c. CpThe HCl concentration in the flue gas in the p-th flue gas channel is in mg/Nm3；cp-1The HCl concentration in the flue gas in the (p-1) th flue gas channel is in mg/Nm3(ii) a L is the length of the branch pipe air box, and the unit is L is 4 m; n is the number of the air boxes connected with the smoke channels; p is more than or equal to 1 and less than or equal to n; when p is 1, (p-1) is the last flue gas channel connected with the previous air box.
Example 15
Example 12 is repeated, except that the flue gas belonging to each windbox 2 of the fourth section is independently conveyed to the desulfurization system 7 or to the dechlorination system 8 through the respective flue gas channel 202 and the switching valve 204 on the corresponding flue gas channel 202 in a switchable manner, which specifically comprises:
the HCl concentration detector 204 detects the content of HCl in flue gas in each flue gas channel connected with each bellows in the fourth section in real time, and calculates the change rate k of the HCl concentration in the flue gas in each flue gas channel2Judgment of k2A positive value and a negative value;
a) if k is2Positive, compare ciAnd b:
a1) if c isiB, introducing the flue gas conveyed by all the flue gas channels from the beginning to the end of the flue gas channel to a dechlorination system 4, and detecting the content of HCl in the flue gas in the previous flue gas channel;
a2) if c isiIf the number of the sections is less than b, introducing the flue gas conveyed by the flue gas channel connected with each air box in the fourth section from the beginning of the flue gas channel to the front into a desulfurization system 7, and detecting the content of HCl in the flue gas in the next flue gas channel;
b) if k is2Is 0, compare ciAnd b:
b1) if c isiB, introducing the flue gas conveyed by the flue gas channel into a dechlorination system 4, and detecting the content of HCl in the flue gas in the previous flue gas channel and the flue gas in the next flue gas channel;
b2) if c isiIf the content of HCl in the flue gas channel is less than b, the flue gas conveyed by the flue gas channel is introduced into a large flue 3, and the content of HCl in the flue gas in the next flue gas channel is detected;
c) if k is2Is negative, compare ciAnd b:
c1) if c isiB, introducing the flue gas conveyed by the flue gas channel into a dechlorination system 4, and detecting the content of HCl in the flue gas in the next flue gas channel;
c2) if c isiIf the number of the smoke channels is less than b, the smoke conveyed by the smoke channel is introduced into the large flue 3, and the content of HCl in the smoke in the previous smoke channel is detected. 12. The method according to any one of claims 1 to 11, whereinThe method comprises the following steps: before the flue gas conveyed to the desulfurization system 7 enters the desulfurization system 7, the flue gas is uniformly mixed by the first flue gas mixer 4 and then enters the desulfurization system 7; before the flue gas conveyed to the dechlorination system 8 enters the dechlorination system 8, the flue gas is uniformly mixed by the second flue gas mixer 5 and then enters the dechlorination system 8.

Claims (16)

1. A method for controlling hydrogen chloride and sulfur dioxide emissions from a sintering source, the method comprising the steps of:
1) paving sintering raw materials on a sintering trolley (1), igniting and sintering, wherein j air boxes (2) are arranged below the sintering trolley (1), and are numbered from the head of a sintering machine, namely a1 st air box, a2 nd air box and a … … th j air box in sequence; the sintering flue gas is discharged through a wind box (2);
2) according to the running direction of the sintering trolley (1), dividing the bellows into 3 sections, wherein the first section comprises 1 st bellows to g th bellows, the second section comprises (g +1) th bellows to h th bellows, and the third section comprises (h +1) th bellows to j th bellows; wherein the flue gas belonging to each wind box (2) of the first section is conveyed to the large flue (3) through a respective flue gas channel (202); the flue gas belonging to each wind box (2) of the second section is conveyed to a desulfurization system (7) through a respective flue gas channel (202); the flue gas of each wind box (2) belonging to the third section is conveyed to a dechlorination system (8) through a respective flue gas channel (202); wherein: g is j/2 to 2j/3, h is 3j/4 to 4 j/5; rounding up j/2, 2j/3, 3j/4 and 4 j/5;
3) carrying out desulfurization treatment on the air box flue gas conveyed to the desulfurization system (7) to obtain desulfurization tail gas, and conveying the desulfurization tail gas to a dechlorination system (8);
4) carrying out dechlorination treatment on the desulfurized tail gas and the flue gas of the air box which are conveyed to a dechlorination system (8) to obtain dechlorinated tail gas, and conveying the dechlorinated tail gas to a large flue (3);
5) the air box flue gas and dechlorination tail gas in the large flue (3) are sent to a flue gas treatment system for flue gas purification treatment.
2. The method of claim 1, wherein: step 2) dividing the windboxes into 5 sections, wherein the first section comprises the 1 st to the (g-a) th windboxes, the second section comprises the (g-a +1) th to the (g + a) th windboxes, the third section comprises the (g + a +1) th to the (h-a) th windboxes, the fourth section comprises the (h-a +1) th to the (h + a) th windboxes, and the fifth section comprises the (h + a +1) th to the jth windboxes; wherein the flue gas belonging to each wind box (2) of the first section is conveyed to the large flue (3) through a respective flue gas channel (202); the flue gas belonging to each wind box (2) of the second section is respectively and independently conveyed to the large flue (3) or the desulfurization system (7) through the respective flue gas channel (202) and the switching valve (204) on the corresponding flue gas channel (202) in a switchable manner; the flue gas belonging to each wind box (2) of the third section is conveyed to a desulfurization system (7) through a respective flue gas channel (202); the flue gas belonging to each wind box (2) of the fourth section is respectively and independently conveyed to a desulfurization system (7) or a dechlorination system (8) through a switching valve (204) on each flue gas channel (202) and the corresponding flue gas channel (202) in a switchable manner; the flue gas of each wind box (2) belonging to the fifth section is conveyed to a dechlorination system (8) through a respective flue gas channel (202); wherein: a is 1 to 5, preferably 2 to 4; (h-g) > 2 a; g is more than a; (j-h) > a.
3. The method of claim 2, wherein: the air boxes (2) respectively comprise an air box body (201) and a flue gas channel (202), and an SO2 concentration detector (203) and a switching valve (205) are arranged on the flue gas channel (202) connected with the air box in the second section; and/or
A flue gas channel (202) connected with the wind box of the fourth section is provided with an HCl concentration detector (204) and a switching valve (205).
4. The method of claim 3, wherein: the SO2 concentration detector (203) detects SO in the sintering flue gas discharged by the second section air box in real time2Judging the SO in the sintering flue gas discharged by the air box2Whether the concentration of (b) reaches the pretreatment target value a:
if the bellows discharges SO in the sintering flue gas2Does not reach the pretreatment targetThe value a is that the flue gas discharged by the wind box is introduced into the large flue (3) through the switching valve (204);
if the bellows discharges SO in the sintering flue gas2When the concentration of the flue gas reaches a pre-treatment target value a, the flue gas discharged by the air box is introduced into a desulfurization system (7) through a switching valve (204);
wherein: a is 200mg/Nm3。
5. The method of claim 3, wherein: an HCl concentration detector (204) detects the concentration of HCl in the sintering flue gas discharged by the wind box in the fourth section in real time, and judges whether the concentration of HCl in the sintering flue gas discharged by the wind box reaches a processing target value b:
if the concentration of HCl in the sintering flue gas discharged by the air box does not reach the treatment target value b, introducing the flue gas discharged by the air box into a desulfurization system (7) through a switching valve (204);
if the concentration of HCl in the sintering flue gas discharged by the wind box reaches a treatment target value b, introducing the flue gas discharged by the wind box into a dechlorination system (8) through a switching valve (204);
wherein: b is 10mg/Nm3。
6. The method of claim 4, wherein: each wind box belonging to the second section is connected with n smoke channels (202); SO is respectively and independently arranged on each flue gas channel2The concentration detector (203) is used for conveying the flue gas to the large flue (3) or the desulfurization system (7) in a switchable manner through the switching valve (205) independently for each flue gas channel; n is 1 to 5, preferably 2 to 4.
7. The method of claim 6, wherein: setting SO in flue gas in adjacent flue gas channels in wind box2The rate of change of concentration is k1：
Figure FDA0003027344410000021
In the formula, k1SO of ith flue gas channel2The concentration is based on SO in the last flue gas channel2The rate of change of concentration; c. CiIs SO in the flue gas in the ith flue gas channel2Concentration in mg/Nm3；ci-1Is SO in the flue gas in the (i-1) th flue gas channel2Concentration in mg/Nm3(ii) a L is the length of the branch pipe air box and is m; n is the number of the air boxes connected with the smoke channels; i is more than or equal to 1 and less than or equal to n; and when i is 1, (i-1) is the last flue gas channel connected with the previous air box.
8. The method of claim 7, wherein: the flue gas belonging to each wind box (2) of the second section is respectively and independently conveyed to the large flue (3) or the desulfurization system (7) through the respective flue gas channel (202) and the switching valve (204) on the corresponding flue gas channel (202) in a switchable manner, and the method specifically comprises the following steps:
the SO2 concentration detector (203) detects SO in flue gas in each flue gas channel connected with each wind box in the second section in real time2Calculating the SO in the flue gas in each flue gas channel2Rate of change of concentration k1Judgment of k1A positive value and a negative value;
a) if k is positive, compare ciAnd a:
a1) if c isiA is more than or equal to a, the flue gas conveyed by the flue gas channel connected with each air box in the second section from the beginning of the flue gas channel to the back is introduced into a desulfurization system (7), and SO in the flue gas in the previous flue gas channel is detected2The content of (A);
a2) if c isiIf < a, the flue gas conveyed by all the flue gas channels from the beginning to the front of the flue gas channel is introduced into a large flue (3), and SO in the flue gas in the next flue gas channel is detected2The content of (A);
b) if k is 0, compare ciAnd a:
b1) if c isiA is more than or equal to a, the flue gas conveyed by the flue gas channel is introduced into a desulfurization system (7), and SO in the flue gas in the previous flue gas channel and the next flue gas channel is detected2The content of (A);
b2) if c isiIf < a, the flue gas conveyed by the flue gas channel is introducedA large flue (3) and detects SO in the flue gas in the latter flue gas channel2The content of (A);
c) if k is negative, compare ciAnd a:
c1) if c isiA is more than or equal to a, the flue gas conveyed by the flue gas channel is introduced into a desulfurization system (7), and SO in the flue gas in the next flue gas channel is detected2The content of (A);
c2) if c isiIf < a, the flue gas conveyed by the flue gas channel is introduced into a large flue (3), and SO in the flue gas in the previous flue gas channel is detected2The content of (a).
9. The method of claim 5, wherein: each wind box belonging to the fourth section is connected with n smoke channels (202); an HCl concentration detector (204) is respectively and independently arranged on each flue gas channel (202), and each flue gas channel respectively and independently conveys flue gas to a desulfurization system (7) or a dechlorination system (8) in a switchable manner through a switching valve (205); n is 1 to 5, preferably 2 to 4.
10. The method of claim 9, wherein: setting the change rate of HCl concentration in the flue gas in the adjacent flue gas channels in the air box to be k2：
Figure FDA0003027344410000031
In the formula, k2The change rate of the HCl concentration of the pth flue gas channel is based on the HCl concentration in the last flue gas channel; c. CpThe HCl concentration in the flue gas in the p-th flue gas channel is in mg/Nm3；cp-1The HCl concentration in the flue gas in the (p-1) th flue gas channel is in mg/Nm3(ii) a L is the length of the branch pipe air box and is m; n is the number of the air boxes connected with the smoke channels; p is more than or equal to 1 and less than or equal to n; when p is 1, (p-1) is the last flue gas channel connected with the previous air box.
11. The method of claim 8, wherein: the flue gas belonging to each wind box (2) of the fourth section is respectively and independently conveyed to a desulfurization system (7) or a dechlorination system (8) in a switchable manner through a switching valve (204) on each flue gas channel (202) and the corresponding flue gas channel (202), and the method comprises the following specific steps:
an HCl concentration detector (204) detects the content of HCl in flue gas in each flue gas channel connected with each bellows in the fourth section in real time, and calculates the change rate k of the HCl concentration in the flue gas in each flue gas channel2Judgment of k2A positive value and a negative value;
a) if k is2Positive, compare ciAnd b:
a1) if c isiB, introducing the flue gas conveyed by all the flue gas channels from the beginning to the end of the flue gas channel to a dechlorination system (4), and detecting the content of HCl in the flue gas in the previous flue gas channel;
a2) if c isiIf the number of the sections is less than b, introducing the flue gas conveyed by the flue gas channel connected with each air box in the fourth section from the beginning of the flue gas channel to the front into a desulfurization system (7), and detecting the content of HCl in the flue gas in the next flue gas channel;
b) if k is2Is 0, compare ciAnd b:
b1) if c isiB, introducing the flue gas conveyed by the flue gas channel into a dechlorination system (4), and detecting the content of HCl in the flue gas in the previous flue gas channel and the flue gas in the next flue gas channel;
b2) if c isiIf the number of the smoke channels is less than b, the smoke conveyed by the smoke channel is introduced into a large flue (3), and the content of HCl in the smoke in the next smoke channel is detected;
c) if k is2Is negative, compare ciAnd b:
c1) if c isiB, introducing the flue gas conveyed by the flue gas channel into a dechlorination system (4), and detecting the content of HCl in the flue gas in the next flue gas channel;
c2) if c isiIf the number of the smoke channels is less than b, the smoke conveyed by the smoke channel is introduced into a large flue (3), and the content of HCl in the smoke in the previous smoke channel is detected.
12. The method according to any one of claims 1-11, wherein: before flue gas conveyed to the desulfurization system (7) enters the desulfurization system (7), the flue gas is uniformly mixed by the first flue gas uniformly-mixing device (4) and then enters the desulfurization system (7); before the flue gas conveyed to the dechlorination system (8) enters the dechlorination system (8), the flue gas is uniformly mixed by the second flue gas uniformly-mixing device (5) and then enters the dechlorination system (8); and/or
j is 12 to 48, preferably 18 to 42, more preferably 20 to 36.
13. A system for controlling hydrogen chloride and sulphur dioxide emissions from a sintering source or a system for controlling hydrogen chloride and sulphur dioxide emissions from a sintering source for use in the process of any of claims 1 to 12, the system comprising a sintering machine (a), a desulphurization system (7), a dechlorination system (8), a flue gas treatment system (6); wherein: the sintering machine (A) comprises a sintering trolley (1), an air box (2) and a large flue (3); the plurality of air boxes (2) are arranged below the sintering trolley (1) in parallel and are numbered as the 1 st air box, the 2 nd air box and the … … th air box in sequence; the air box comprises an air box body (201) and a flue gas channel (202); wherein: the 1 st to the g th windboxes are connected to a large flue (3) through respective flue gas channels (202), the (g +1) th to the h th windboxes (2) are connected to a desulfurization system (7) through respective flue gas channels (202), and the (h +1) th to the j th windboxes are connected to a dechlorination system (8) through respective flue gas channels (202); the tail end of the large flue (3) is connected to a flue gas treatment system (6); wherein: g is j/2 to 2j/3, h is 3j/4 to 4 j/5; j/2, 2j/3, 3j/4, 4j/5 are rounded.
14. The system of claim 13, wherein: j wind boxes (2) are arranged below the sintering trolley (1) in parallel and are numbered as the 1 st wind box, the 2 nd wind box and the … … th wind box in sequence; the 1 st to (g-a) th windboxes are connected to the large flue (3) through respective flue gas channels (202), the (g-a +1) th to (g + a) th windboxes are respectively and independently connected to the large flue (3) and the desulfurization system (7) through respective flue gas channels (202) and switching valves (204) provided on the flue gas channels (202) in a switchable manner, the (g + a +1) th to (h-a) th windboxes are connected to the desulfurization system (7) through respective flue gas channels (202), the (h-a +1) th to (h + a) th windboxes are respectively and independently connected to the desulfurization system (7) and the dechlorination system (8) through respective flue gas channels (202) and switching valves (204) provided on the flue gas channels (202) in a switchable manner, the (h + a +1) th wind box to the jth wind box are connected to a dechlorination system (8) through respective flue gas channels (202);
wherein: a is 1 to 5, preferably 2 to 4; (h-g) > 2 a; g is more than a; (j-h) > a.
15. The system of claim 14, wherein: the (g-a +1) th air box to the (g + a) th air box are connected with n flue gas channels (202), and each flue gas channel is correspondingly provided with SO2A concentration detector (203) and a switching valve (205); and/or
The (h-a +1) th air box to the (h + a) th air box are connected with n flue gas channels (202), and each flue gas channel is correspondingly provided with an HCl concentration detector (204) and a switching valve (205);
preferably, n is 1 to 5; more preferably 2-4.
16. The system according to any one of claims 13-16, wherein: the system also comprises a first flue gas blending device (4) and a second flue gas blending device (5), wherein a flue gas channel (202) connected to the desulfurization system (7) is connected to the first flue gas blending device (4) firstly, and an air outlet of the first flue gas blending device (4) is connected to an air inlet of the desulfurization system (7); a flue gas channel (202) connected to the dechlorination system (8) is connected to the second flue gas mixer (5), and an air outlet of the second flue gas mixer (5) is connected to an air inlet of the dechlorination system (8); and/or
The air outlet of the desulfurization system (7) is connected to the air inlet of a dechlorination system (8); the air outlet of the dechlorination system (8) is connected with the large flue (3); and/or
The flue gas treatment system (6) comprises a dust remover (601), an exhaust fan (602), a flue gas purification system (603) and a chimney (604).
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