CN202909607U - Waste gas treatment device - Google Patents

Waste gas treatment device Download PDF

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Publication number
CN202909607U
CN202909607U CN2012206362110U CN201220636211U CN202909607U CN 202909607 U CN202909607 U CN 202909607U CN 2012206362110 U CN2012206362110 U CN 2012206362110U CN 201220636211 U CN201220636211 U CN 201220636211U CN 202909607 U CN202909607 U CN 202909607U
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adsorption tower
mentioned
desorption gas
gas
loopback
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田中建夫
森本启太
后藤浩平
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Nippon Steel Engineering Co Ltd
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Sumitomo Heavy Industries Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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Abstract

The utility model provides a waste gas treatment device which is characterized by comprising an adsorption tower and a sulfur oxide feeding part, wherein the adsorption tower is used for removing sulfur oxides and nitrogen oxides contained in waste gas with carbonaceous adsorbent and NH3 which are fed from the upper part of the adsorption tower, and discharging the carbonaceous adsorbent adsorbed with sulfur oxides and nitrogen oxides from the bottom of the adsorption tower; and the sulfur oxide feeding part is used for feeding sulfur oxide-contained gas to the upper part of the adsorption tower. Therefore, the waste gas treatment device can prevent the generation and outflow of leaked NH3.

Description

Emission-control equipment
Technical field
The utility model relates to emission-control equipment.
Background technology
From the waste gas of the equipment (for example, boiler and sintering machine) that uses fossil fuel, after having carried out desulfurization and denitration and process by the whole bag of tricks, discharge from chimney.The emission-control equipment of implementing this desulfurization and denitration processing for example has adsorption tower (carbonaceous adsorbent mobile layer) and regenerator.
In adsorption tower, waste gas and NH 3Mix, and contact with the carbonaceous adsorbent such as activated carbon.SO in the waste gas XAfter being adsorbed by carbonaceous adsorbent, as H 2SO 4Be fixed in carbonaceous adsorbent.On the other hand, NO XThat cause by the catalytic effect by carbonaceous adsorbent and NH 3Between reduction reaction, be broken down into N 2This reduction reaction with for NO XThe denitration that is formed by metallic catalyst in reduction reaction identical.
In addition, in adsorption tower, supply to the NH of waste gas 3With NO XCompare easier H with being fixed in carbonaceous adsorbent 2SO 4Reaction.Therefore, in order fully to remove NO XAnd supply with a large amount of NH 3In addition, carbonaceous adsorbent originally had easy absorption acidic materials and was not easy absorption such as NH 3The character of such alkaline matter.Its result is not with H 2SO 4Perhaps NO XThe NH of reaction 3(produce so-called leakage NH from the outlet discharge of adsorption tower 3).This leaks NH 3Flow out to chimney.
On the other hand, under many circumstances, also to the waste gas of the chimney importing that is connected with emission-control equipment from other treating apparatus.If have HCl in such waste gas, then sometimes this HCl and above-mentioned leakage NH 3Reaction, thus ammonium chloride (NH generated 4Cl).If it condenses, then from dragging, chimney has the white cigarette (visible smoke) of observability after chimney is discharged.
The utility model content
The purpose of this utility model is to provide a kind of can suppress such leakage NH 3Generation and the emission-control equipment of the type of outflow.
Emission-control equipment of the present utility model (this device) is characterized in that, has: adsorption tower, it utilizes carbonaceous adsorbent and the NH that supplies with from top 3Remove the sulfur and nitrogen oxides that contains in the waste gas, and have the carbonaceous adsorbent of sulfur and nitrogen oxides to discharge from the bottom absorption; With the oxysulfide supply unit, the gas that contains oxysulfide is supplied with on its top to above-mentioned adsorption tower.
Waste gas from the equipment (for example boiler and sintering machine) that uses fossil fuel is carried out desulfurization to this device and denitration is processed.Adsorption tower for from this processing to this device is filled carbonaceous adsorbent.This carbonaceous adsorbent is supplied with from the top of adsorption tower and is slowly flowed to the bottom.In addition, also supply with the NH that is used for denitration to the adsorption tower of this device 3Waste gas with NH 3The state that mixes contacts with carbonaceous adsorbent.Thus, from waste gas, removed its oxysulfide that contains (SO for example 2) and nitrogen oxide (for example NO).In addition, absorption has the carbonaceous adsorbent of these oxides to discharge from the bottom of adsorption tower.
Like this, in adsorption tower, carbonaceous adsorbent from it section is supplied with and is discharged from the bottom.Thereby in adsorption tower, the carbonaceous adsorbent that is in its underpart was exposed in the waste gas within the long time.Therefore, be in the SO of the carbonaceous adsorbent of bottom 2Adsorbance is more.On the other hand, be in the SO of carbonaceous adsorbent on the top of adsorption tower 2Adsorbance is less.For this reason, be not easy to occur NH on the top of adsorption tower 3With the SO that is adsorbed in carbonaceous adsorbent 2Between reaction.Thereby, carry out based on NH actively on the top of adsorption tower 3Denitration reaction.
In addition, usually, consider the SO that is adsorbed in carbonaceous adsorbent 2(H 2SO 4) and NH 3React, and the NH that is used for denitration that supplies with to adsorption tower that supplies with more 3In addition, NH3 is not easy to be adsorbed by carbonaceous adsorbent.
Therefore, in this device, the oxysulfide supply unit is supplied with the gas that comprises oxysulfide to the top of adsorption tower.Thus, oxysulfide is adsorbed the carbonaceous adsorbent absorption on the top of tower.Its result is used for the unnecessary NH of denitration 3React and adsorbed by carbonaceous adsorbent by the oxysulfide with carbonaceous adsorbent.Thus, this device can suppress to leak NH 3Generation and outflow.
In addition, the preferred regenerator that also has for processing that the carbonaceous adsorbent of discharging from above-mentioned adsorption tower is regenerated, above-mentioned oxysulfide supply unit is desorption gas loopback mechanism, and this desorption gas loopback mechanism will carry out the desorption gas that contains oxysulfide of discharging when above-mentioned regeneration is processed and contain the gas of oxysulfide and supply with to the top of adsorption tower as above-mentioned.
In addition, preferred above-mentioned adsorption tower has a plurality of adsorption chambers of arranging along the importing direction of waste gas,
Above-mentioned desorption gas loopback mechanism supplies with above-mentioned desorption gas to the top that waste gas imports the adsorption chamber in the downstream on the direction.
In addition, preferred also have a desorption gas washing facility that the desorption gas that carries out discharging when above-mentioned regeneration is processed is washed, and above-mentioned desorption gas loopback mechanism will be supplied with to the top of the adsorption chamber in above-mentioned downstream by the desorption gas after the above-mentioned desorption gas washing facility washing.
In addition, preferred above-mentioned desorption gas loopback mechanism comprises: the loopback desorption gas feeder that is arranged at above-mentioned adsorption tower; With the desorption gas loopback pipeline that this loopback desorption gas feeder and above-mentioned desorption gas washing facility are coupled together.
In addition, preferred above-mentioned loopback desorption gas feeder constitutes, and to the top of the adsorption chamber in above-mentioned downstream, distributes equably above-mentioned desorption gas along the long side direction of this adsorption chamber.
In addition, preferred above-mentioned adsorption tower possesses for the dividing plate that this adsorption tower is isolated into top and bottom.
Description of drawings
Fig. 1 is the key diagram of formation of the emission-control equipment of an expression embodiment of the present utility model.
Fig. 2 is the key diagram of formation of the adsorption tower of expression emission-control equipment.
Fig. 3 is the key diagram of watching the adsorption tower main body of adsorption tower from the top.
Fig. 4 is the key diagram of watching from the side the adsorption tower main body of adsorption tower.
Fig. 5 is the key diagram of the formation of expression loopback desorption gas feeder.
Fig. 6 is the SO of the carbonaceous adsorbent in the expression adsorption tower main body 2The key diagram of the distribution of adsorbance.
The specific embodiment
Below, the emission-control equipment (this device) of an embodiment of the present utility model is described.This device is for the treatment of the gas (waste gas) of discharging from the sintering machine (not shown) that uses fossil fuel.
Fig. 1 is the key diagram of the formation of this device of expression.As shown in the drawing, this device possesses: adsorption tower 11, regenerator 13, carbonaceous adsorbent circulation circulate with conveyer 17, by-product recovery unit 21, desorption gas washing facility 23, intermediate box 24, drainage treatment equipment 25, water-circulating pump 26, NH with conveyer 15, carbonaceous adsorbent 3Feeder 27, and desorption gas loopback pipeline 29.
Adsorption tower 11 utilizes carbonaceous adsorbent to process (purification) by the waste gas of self.That is, in adsorption tower 11, carbonaceous adsorbent from it layer section flows to lower layer part.In addition, the oxysulfide (SO in the carbonaceous adsorbent absorption waste gas in the adsorption tower 11 X) and with nitrogen oxide (NO X) be reduced into N 2Thus, from waste gas, remove harmful substance.Afterwards, chimney 31 is discharged and flowed to waste gas from adsorption tower 11.
NH 3Feeder 27 is supplied with ammonia (NH to adsorption tower 11 3).Thus, ammonia (NH 3) be blended in the waste gas of adsorption tower 11 importings.
Therefore, in adsorption tower 11, the nitrogen oxide (NO in the waste gas X), as shown in Equation 1, utilize NH 3Be broken down into nitrogen (N 2).
NO+NH 3+ 1/4O 2→ N 2+ 3/2H 2O ... (formula 1)
In addition, the sulfur dioxide (SO in the waste gas 2) in the pore of carbonaceous adsorbent, carry out chemical reaction.Thus, as shown in Equation 2, generate sulfuric acid (H 2SO 4) and be adsorbed in carbonaceous adsorbent.
SO 2+ 1/2O 2+ H 2O → H 2SO 4(sulfuric acid) ... (formula 2)
In addition, this sulfuric acid suc as formula 3 and formula 4 shown in, utilize NH 3And become sour sulfur acid ammonium or ammonium sulfate, and be adsorbed on carbonaceous adsorbent.
NH 3+ H 2SO 4→ NH 4HSO 4(acid ammonium sulfate) ... (formula 3)
NH 3+ NH 4HSO 4→ (NH 4) 2HSO 4(ammonium sulfate) ... (formula 4)
In addition, the more than half SO in the waste gas XSO 2, more than half NO XNO.Therefore, in above-mentioned reaction equation, to SO 2And the reaction of NO represents.
In addition, (absorption has SO to adsorption tower 11 with the carbonaceous adsorbent that uses XDeng carbonaceous adsorbent) discharge from its bottom.
The carbonaceous adsorbent circulation is accepted from the carbonaceous adsorbent that uses of adsorption tower 11 discharges with conveyer 17.The carbonaceous adsorbent circulation is transported to regenerator 13 with conveyer 17 with this carbonaceous adsorbent that uses.
13 pairs of carbonaceous adsorbents that use of regenerator regenerate (activation) process.That is, regenerator 13 is heated to the carbonaceous adsorbent that uses more than 400 ℃, thus, is regenerated as and can reuses.Carbonaceous adsorbent after regenerator 13 will be regenerated (regeneration carbonaceous adsorbent) is discharged from its bottom.
The carbonaceous adsorbent circulation is accepted from the carbonaceous adsorbent of regenerator 13 discharges with conveyer 15.The carbonaceous adsorbent circulation is supplied with from the top of adsorption tower 11 this carbonaceous adsorbent with conveyer 15 to adsorption tower 11.
In regenerator 13, by to carbonaceous adsorbent heating, sulfuric acid reacts with carbon (C) as the Constitution Elements of carbonaceous adsorbent, thus, shown in following formula 5, is broken down into SO 2In addition, ammonium sulfate and acid ammonium sulfate are broken down into N shown in following formula 6 and formula 7 2In addition, in this process, generated NH 3That is, in regenerator 13, produce and contain N 2, SO 2And NH 3Desorption gas (gas that contains oxysulfide).
H 2SO 4+ 1/2C → SO 2+ H 2O+1/2CO 2(formula 5)
(NH 4) 2HSO 4→ NH 4HSO 4+ NH 3(formula 6)
NH 4HSO 4→ SO 2+ 2H 2O+1/3N 2+ 1/3NH 3(formula 7)
This desorption gas is by N 2The inert gas dilutions such as gas.Thus, desorption gas is as the SO with 10～30%-dry 2The gas of concentration is discharged from regenerator 13.
23 pairs of desorption gas of discharging from regenerator 13 of desorption gas washing facility wash.Thus, from desorption gas, remove NH 3And dust.NH 3Being washed water absorbs.
Intermediate box 24 is baffle-boxs of these washings.Intermediate box 24 will be from the NH that contains of desorption gas washing facility 23 discharges 3Washings temporarily store and deliver to drainage treatment equipment 25.Drainage treatment equipment 25 is processed and is contained NH 3Washings.Water-circulating pump 26 is the pumps for the washing water circuit of realizing 25 of desorption gas washing facility 23, intermediate box 24 and drainage treatment equipments.
Removed NH by desorption gas washing facility 23 3And the desorption gas (desorption gas after the washing) of dust contains SO 2Desorption gas loopback pipeline 29 is the paths that send back to adsorption tower 11 for the part of the desorption gas after will washing as the loopback desorption gas.In addition, other parts in the desorption gas after the washing are directed to by-product recovery unit 21.By-product recovery unit 21 is any one of sulfuric acid manufacturing equipment or gypsum manufacturing equipment.
Below, the formation of the adsorption tower 11 in this device is at length described.Fig. 2 is the key diagram of the formation of expression adsorption tower 11.As shown in the drawing, adsorption tower 11 possesses: adsorption tower main body 71, entrance air funnel 73 and outlet air funnel 75.
Adsorption tower main body 71 is cross-flow mobile layers.That is, in adsorption tower main body 71, carbonaceous adsorbent is supplied with from top and is discharged from the bottom.In addition, waste gas along with the flow direction of carbonaceous adsorbent roughly the direction of quadrature adsorption tower main body 71 interior flowing.Adsorption tower main body 71 is utilized carbonaceous adsorbent and the NH that supplies with from top 3Remove the oxysulfide and the nitrogen oxide that contain in the waste gas.
As shown in Figure 2, adsorption tower main body 71 comprises cup 91, middle chamber 92 and rear chamber 93.These cups 91, middle chamber 92 and rear chamber 93 are a plurality of adsorption chambers of arranging along the importing direction of waste gas.Cup 91, middle chamber 92 and rear chamber 93 utilize the louver (wire netting) 94 that is represented by dotted lines among Fig. 2 and are separated from each other.
Therefore, the carbonaceous adsorbent of supplying with from the top of adsorption tower main body 71 be directed to cup 91, in chamber 92 and the rear chamber 93 any one.The carbonaceous adsorbent that louver 94 suppresses to be directed to any one chamber moves to other chambers in that adsorption tower main body 71 is interior.
The carbonaceous adsorbent of supplying with from the top of adsorption tower main body 71 cup 91, any one inside in chamber 92 and the rear chamber 93 flow towards the bottom.Cup 91, middle chamber 92 and rear chamber 93 have respectively roll feeder 101,102 and 103 in its lower end.These roll feeders 101,102 and 103 are controlled at respectively the speed of the interior mobile carbonaceous adsorbent in cup 91, middle chamber 92 and rear chamber 93.
Fig. 3 is that (arrow A direction shown in Figure 2) watches the key diagram of the adsorption tower main body 71 of adsorption tower 11 from the top.In addition, Fig. 4 is that (arrow B direction shown in Figure 2) watches the key diagram of adsorption tower main body 71 from the side.
As shown in Figures 3 and 4, adsorption tower main body 71 possesses entrance air chamber 41, two carbonaceous adsorbent layers 43, two outlet air chambers 45 and internal partition 47.
Entrance air chamber 41 is the parts that are configured in the importing waste gas of adsorption tower main body 71 central authorities.Carbonaceous adsorbent layer 43 is the parts that are filled with carbonaceous adsorbent.In carbonaceous adsorbent layer 43, carbonaceous adsorbent flows downwards from the top.Outlet air chamber 45 is connected with chimney 31 by means of outlet air funnel 75.
Internal partition 47(dividing plate) is the plate of isolating up and down for entrance air chamber 41.Thus, adsorption tower main body 71(entrance air chamber 41) be divided into upper layer part (top) 51 and lower layer part (bottom) 53.Its result has suppressed the situation that waste gas and NH3 come and go between upper layer part 51 and lower layer part 53.
Waste gas is directed to the entrance air chamber 41 of upper layer part 51 and the lower layer part 53 of adsorption tower 11.Afterwards, waste gas passes the carbonaceous adsorbent layer 43 that is disposed at its two sides, and flows to chimney 31 by outlet air chamber 45 and outlet air funnel 75.
Entrance air funnel 73 guides waste gas to adsorption tower main body 71.Entrance air funnel 73 (is supplied with waste gas and NH with the side that covers adsorption tower main body 71 shown in Figure 4 3Face) mode be installed on adsorption tower main body 71.That is, entrance air funnel 73 forms to the path of the waste gas of adsorption tower main body 71.Entrance air funnel 73 possesses air funnel outer wall 81, NH 3 Injection nozzle 83, waste gas are taken into mouth 85 and next door 87.
Waste gas is taken into the bottom that mouth 85 is arranged at entrance air funnel 73.
Air funnel outer wall 81 is taken into mouthfuls 85 the end apart from adsorption tower main body 71 side far away from waste gas and gently tilts upward and extend.The upper end of air funnel outer wall 81 is connected with the upper end of the upper layer part 51 of adsorption tower main body 71.
NH 3Injection nozzle 83 is for NH 3From NH shown in Figure 1 3The nozzle that feeder 27 is supplied with to adsorption tower main body 71.NH 3The waste gas that injection nozzle 83 is arranged at the below of air funnel outer wall 81 be taken into mouthfuls 85 apart from adsorption tower main body 71 side far away.In the mode of joining with air funnel outer wall 81 NH is set 3 Injection nozzle 83.
Next door 87 is taken into mouthfuls 85 mediad top from waste gas and gently tilts and extend.The upper end in next door 87 is connected with the internal partition 47 of adsorption tower main body 71.Next door 87 is to be divided into apart from adsorption tower main body 71 side far away with apart from the wall of the near side of adsorption tower main body 71 for the inside (that is, the path of waste gas) with entrance air funnel 73.
Outlet air funnel 75 will pass the carbonaceous adsorbent layer 43 of adsorption tower main body 71 and enter into the waste gas that exports air chamber 45 and guide to chimney 31.
In the adsorption tower 11 with such formation, be taken into mouthfuls 85 the waste gas that enters apart from adsorption tower main body 71 side-draws far away from waste gas, such shown in dotted line C among Fig. 2, inclination along air funnel outer wall 81, by entrance air funnel 73 formed exhaust path apart from adsorption tower main body 71 side far away, flow to the upper layer part 51 of adsorption tower main body 71.
On the other hand, be taken into mouthfuls 85 the waste gas that enters apart from adsorption tower main body 71 near side-draws from waste gas, shown in dotted line D among Fig. 2 like that, by entrance air funnel 73 formed exhaust path apart from the near side of adsorption tower main body 71, flow to the lower layer part 53 of adsorption tower main body 71.In addition, shown in dotted line C among Fig. 2, like that, be taken into mouthful 85 NH that inject from waste gas 3 Upper layer part 51 to adsorption tower main body 71 flows.
Like this, the NH3 that supplies with to adsorption tower 11 is directed to the upper layer part 51 of adsorption tower main body 71 with a part of waste gas.In addition, as mentioned above, carbonaceous adsorbent is supplied with to adsorption tower 11 from the top of adsorption tower 11.Thereby, have many SO after just having regenerated in the upper layer part 51 of adsorption tower 11 2The carbonaceous adsorbent that adsorbance is less.
Its result, in upper layer part 51, many NH 3Not can with SO 2The reaction, and can with waste gas in NO XReact.Thereby, can effectively carry out denitration to waste gas.
In addition, adsorption tower main body 71 possesses for the internal partition 47 that adsorption tower main body 71 is isolated into upper layer part 51 and lower layer part 53.Thus, suppressed NH 3In adsorption tower main body 71 from upper layer part 51 to lower layer part 53 situations about flowing.Therefore, can further improve NH 3Denitration efficiency.
Then the desorption gas loopback mechanism (oxysulfide supply unit) in this device is described.As shown in Figure 2, as desorption gas loopback mechanism, adsorption tower 11 has above-mentioned desorption gas loopback pipeline 29 and loopback desorption gas feeder (loopback desorption gas distributor) 77.As shown in Figure 2, loopback desorption gas feeder 77 is installed on the top of the rear chamber 93 of adsorption tower main body 71.Should after chamber 93 are adsorption chambers that waste gas imports the downstream of direction.
Fig. 5 is the key diagram of the formation of expression loopback desorption gas feeder 77.In the figure, from arrow A direction shown in Figure 2 loopback desorption gas feeder 77 is represented.Loopback desorption gas feeder 77 extends with roll feeder 103 almost parallel ground.In addition, the same length of the length L of loopback desorption gas feeder 77 and roll feeder 103.
Loopback desorption gas feeder 77 will be supplied with to the top of the rear chamber 93 of adsorption tower main body 71 by the loopback desorption gas that 29 loopbacks of desorption gas loopback pipeline come from desorption gas washing facility 23.As shown in Figure 5, loopback desorption gas feeder 77 with the loopback desorption gas with along the long side direction (direction vertical with the paper of Fig. 2) of rear chamber 93 roughly uniformly mode supply with (distribution) in the top of chamber 93 backward.
Fig. 6 is the SO of the carbonaceous adsorbent in the expression adsorption tower main body 71 2The key diagram that adsorbance distributes.Arrow Y shown in this figure represents the flow direction of the carbonaceous adsorbent in the adsorption tower main body 71.In addition, arrow X represents the flow direction of waste gas.In addition, regional R1(has hatched part) be to contain more SO 2The zone of the carbonaceous adsorbent that adsorbance is many.In addition, regional R2(does not have hatched part) be to contain more SO 2The zone of the carbonaceous adsorbent that adsorbance is few.
As shown in the drawing, regional R1 is partial to the gas access side of adsorption tower main body 71 more.In addition, the bottom of adsorption tower main body 71 then regional R1 also more to the gas vent Directional Extension.On the other hand, regional R2 is partial to the gas vent side of adsorption tower main body 71 more.In addition, the top of adsorption tower main body 71 then regional R2 also more expand to the gas access side.
Like this, in adsorption tower main body 71, be positioned at low position, and near exhaust gas entrance, then the SO of carbonaceous adsorbent 2Adsorbance is more.On the other hand, be positioned at high position, and away from exhaust gas entrance, then the SO of carbonaceous adsorbent 2Adsorbance is fewer.
Therefore, be positioned at apart from exhaust gas entrance position far away and be the SO of the carbonaceous adsorbent of higher position (that is, the top of rear chamber 93) 2Adsorbance is less.In addition, as mentioned above, NH 3 Upper layer part 51 to adsorption tower main body 71 is supplied with.Thereby the top of rear chamber 93 is in the SO of carbonaceous adsorbent 2Less and the NH of adsorbance 3More state.Therefore, so that on the top of rear chamber 93, by NH 3The denitration reaction that carries out carries out actively.
In addition, usually, consider the SO that is adsorbed in carbonaceous adsorbent 2And NH 3React, and many slightly supplies are from NH 3The NH that is used for denitration that injection nozzle 83 is supplied with 3In addition, NH 3Be difficult to be adsorbed in carbonaceous adsorbent.Therefore, might be from adsorption tower main body 71(especially, the top of rear chamber 93) produce and leak NH 3
Consider this point, in this device, loopback desorption gas feeder 77 is supplied with the loopback desorption gas to the top that is in the rear chamber 93 in the regional R2.Thus, the SO in the loopback desorption gas 2Be adsorbed on the carbonaceous adsorbent in the regional R2.Its result is used for the unnecessary NH of denitration 3By with the SO of carbonaceous adsorbent 2React and be adsorbed on carbonaceous adsorbent.Thus, in this device, can suppress to leak NH 3Generation and outflow.
Like this, in this device, need not be provided in addition removing leakage NH 3Device and need not supply be used for and NH from the outside 3The material of reaction leaks NH and can reduce 3Thereby, also can suppress to leak NH for reducing 3Investment and operating cost.
In addition, preferred, loopback desorption gas feeder 77 is controlled the SO that supplies with to adsorption tower main body 71 by means of the loopback desorption gas by the amount of control to the loopback desorption gas of adsorption tower main body 71 loopbacks 2Amount.That is, preferred, loopback desorption gas feeder 77 is with the SO of following amount 2The top of chamber 93 is supplied with backward,, realizes utilizing NH that is 3The sufficient denitration of carrying out, and leak NH 3Generation such amount below setting.
At this, with leakage NH 3Relevant above-mentioned " setting " of generation for example be, even leak NH 3To the chimney 31 mobile amounts that also can not produce from chimney 31 degree of visible smokes.This visible smoke comprises owing to leak NH 3Ammonium chloride (the NH that reacts with the HCl that discharges from other treating apparatus and produce 4Cl) etc.
In addition, loopback desorption gas feeder 77 also can utilize N with the loopback desorption gas from desorption gas loopback pipeline 29 2Perhaps air etc. has carried out after the dilution, and chamber 93 is supplied with backward.Thus, the SO in the loopback desorption gas 2Concentration is diluted.Loopback desorption gas feeder 77 also can be controlled the SO that supplies with to adsorption tower main body 71 by means of the loopback desorption gas according to the degree of this dilution 2Amount.
In addition, in the present embodiment, loopback desorption gas feeder 77 is supplied with at the top of chamber 93 the loopback desorption gas backward.At this moment, preferred loopback desorption gas feeder 77 is supplied with the loopback desorption gas to the side than the more close waste gas outlet of central portion of rear chamber 93.
That is, in rear chamber 93, the central authorities of chamber 93 were the coniform of summit after carbonaceous adsorbent was piled into, and kept this state to descend downwards.At this moment, being present in carbonaceous adsorbent than a side of the more close waste gas outlet of central portion of rear chamber 93 moves on one side to waste gas outlet on one side and descends.Therefore, the carbonaceous adsorbent that is present in this is difficult near central portion.Thereby, in rear chamber 93, can form to contain and adsorb SO 2The thin layer of carbonaceous adsorbent.Thus, can improve denitration performance, and reduce leakage NH 3
In addition, in the present embodiment, loopback desorption gas feeder 77 will be supplied with to adsorption tower main body 71 by the part of the desorption gas after 23 washings of desorption gas washing facility.But, being not limited to this, loopback desorption gas feeder 77 also can be supplied with the unwashed desorption gas of discharging from regenerator 13 to adsorption tower 11.
In addition, in this device, to the SO that contains of adsorption tower main body 71 interior supplies 2Gas be the desorption gas of discharging from desorption gas washing facility 23.But, to the SO that contains of adsorption tower main body 71 interior supplies 2Gas (gas that comprises oxysulfide) also can be gas beyond the desorption gas.For example, this device also can possess to have put aside and contains SO 2The gas tank of gas.In this case, by desorption gas loopback pipeline 29 and loopback desorption gas feeder 77,71 interior supplies contain SO from this gas tank to the adsorption tower main body 2Gas.
In addition, in the present embodiment, loopback desorption gas feeder 77 along the width of rear chamber 93 roughly equably backward the top of chamber 93 supply with (distribution) loopback desorption gas.But, be not limited to this, loopback desorption gas feeder 77 also backward the part of chamber 93 supply with the loopback desorption gas.In addition, loopback desorption gas feeder 77 is chamber 93 backward not only, also can supply with the loopback desorption gas to cup 91 and/or middle chamber 92.
Adsorption tower main body 71 also can not have internal partition 47.In this case, the NH that supplies with to the top of adsorption tower main body 71 3May have on a small quantity and flow to the bottom.But, even this formation also is NH 3Major part supply with to the top of adsorption tower main body 71.Therefore, compare with formation in the past, can effectively carry out by NH 3The denitration of carrying out.
In addition, in the present embodiment, as the equipment that imports the use fossil fuel of waste gas to this device, enumerated sintering machine.But, being not limited to this, this equipment also can be boiler (for example, coal fired boiler).
In addition, the carbonaceous adsorbent shown in the present embodiment for example comprises activated carbon, active lignite, activated charcoal or activated charcoal.
In addition, the emission-control equipment of present embodiment also can be the 1st～the 3rd following emission-control equipment.That is, the 1st emission-control equipment is to leak NH 3The emission-control equipment of minimizing type, it is the device that uses the regenerative desulfurizing and denitrifying process, this regenerative desulfurizing and denitrifying process has used carbonaceous adsorbent mobile layer (adsorption layer), and this emission-control equipment is characterised in that, with contained SO in the regeneration gas (desorption gas) 2Directly be recycled to the top of adsorption layer and be near the carbonaceous adsorbent layer of waste gas outlet side.
The 2nd emission-control equipment is the emission-control equipment that leaks NH3 minimizing type, it is characterized in that, on the basis of the 1st emission-control equipment, possesses the exhaust-gas treatment adsorption layer with a plurality of adsorption layers of arranging along the waste gas streams Inbound, near near the loopback SO top of the adsorption layer of waste gas outlet side 2
The 3rd emission-control equipment is to leak NH 3The emission-control equipment of minimizing type is characterized in that, on the basis of the 1st or the 2nd emission-control equipment, with SO 2The position of carrying out loopback is provided with for SO 2The distributor of supplying with equably.

Claims (7)

1. emission-control equipment is characterized in that having:
Adsorption tower, it utilizes carbonaceous adsorbent and the NH that supplies with from top 3Remove the sulfur and nitrogen oxides that contains in the waste gas, and have the carbonaceous adsorbent of sulfur and nitrogen oxides to discharge from the bottom absorption; With
The oxysulfide supply unit, the gas that contains oxysulfide is supplied with on its top to above-mentioned adsorption tower.
2. emission-control equipment according to claim 1 is characterized in that,
Also have the regenerator of regenerating and processing for to the carbonaceous adsorbent of discharging from above-mentioned adsorption tower,
Above-mentioned oxysulfide supply unit is desorption gas loopback mechanism, and this desorption gas loopback mechanism will carry out the desorption gas that contains oxysulfide of discharging when above-mentioned regeneration is processed and contain the gas of oxysulfide and supply with to the top of adsorption tower as above-mentioned.
3. emission-control equipment according to claim 2 is characterized in that,
Above-mentioned adsorption tower has a plurality of adsorption chambers of arranging along the importing direction of waste gas,
Above-mentioned desorption gas loopback mechanism supplies with above-mentioned desorption gas to the top that waste gas imports the adsorption chamber in the downstream on the direction.
4. emission-control equipment according to claim 3 is characterized in that,
Also have the desorption gas washing facility that the desorption gas that carries out discharging when above-mentioned regeneration is processed is washed,
Above-mentioned desorption gas loopback mechanism will be supplied with to the top of the adsorption chamber in above-mentioned downstream by the desorption gas after the above-mentioned desorption gas washing facility washing.
5. emission-control equipment according to claim 4 is characterized in that,
Above-mentioned desorption gas loopback mechanism comprises:
Be arranged at the loopback desorption gas feeder of above-mentioned adsorption tower; With
The desorption gas loopback pipeline that this loopback desorption gas feeder and above-mentioned desorption gas washing facility are coupled together.
6. emission-control equipment according to claim 5 is characterized in that,
Above-mentioned loopback desorption gas feeder constitutes, and to the top of the adsorption chamber in above-mentioned downstream, distributes equably above-mentioned desorption gas along the long side direction of this adsorption chamber.
7. the described emission-control equipment of any one according to claim 1～6 is characterized in that,
Above-mentioned adsorption tower possesses for the dividing plate that this adsorption tower is isolated into top and bottom.
CN2012206362110U 2012-11-27 2012-11-27 Waste gas treatment device Expired - Lifetime CN202909607U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103585868A (en) * 2013-11-27 2014-02-19 张博 Flue gas treating device capable of synchronously removing sulfur, saltpeter, mercury and dedusting and its method
CN108014628A (en) * 2016-10-31 2018-05-11 中国石油化工股份有限公司 A kind of absorber and a kind of adsorbent equipment and its application and a kind of flue gas purifying method
CN108332565A (en) * 2018-01-23 2018-07-27 宁波市鄞州区达之丰工业产品设计有限公司 A kind of metallurgy pollution emission reduction device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103585868A (en) * 2013-11-27 2014-02-19 张博 Flue gas treating device capable of synchronously removing sulfur, saltpeter, mercury and dedusting and its method
CN103585868B (en) * 2013-11-27 2016-06-08 张博 The flue gas processing device of the de-mercury dedusting of a kind of synchronized desulfuring and denitrifying and method
CN108014628A (en) * 2016-10-31 2018-05-11 中国石油化工股份有限公司 A kind of absorber and a kind of adsorbent equipment and its application and a kind of flue gas purifying method
CN108014628B (en) * 2016-10-31 2019-12-27 中国石油化工股份有限公司 Adsorber, adsorption device and application thereof, and flue gas purification method
CN108332565A (en) * 2018-01-23 2018-07-27 宁波市鄞州区达之丰工业产品设计有限公司 A kind of metallurgy pollution emission reduction device

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