CN216023924U - Powdered activated carbon high-temperature thermal regeneration waste gas purification equipment - Google Patents

Powdered activated carbon high-temperature thermal regeneration waste gas purification equipment Download PDF

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CN216023924U
CN216023924U CN202121579011.1U CN202121579011U CN216023924U CN 216023924 U CN216023924 U CN 216023924U CN 202121579011 U CN202121579011 U CN 202121579011U CN 216023924 U CN216023924 U CN 216023924U
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activated carbon
waste gas
fan
dust
outlet end
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覃将伟
杜汉桥
张小松
岳彪
肖长生
张岚欣
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Shengzhou Tanding Carbon Technology Co ltd
Junji Environmental Technology Co ltd
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Shengzhou Tanding Carbon Technology Co ltd
Junji Environmental Technology Co 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
    • 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
    • Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/20—Capture or disposal of greenhouse gases of methane

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Abstract

The utility model provides a hot regeneration exhaust gas purification equipment of powdered activated carbon high temperature, belongs to industrial waste gas purification field, and it includes: the device comprises a first dust removal mechanism, a first fan, a heat accumulating type thermal oxidation furnace, a second dust remover, a second fan, a water washing tower, an absorption tower and an adsorption box; the air outlet end of the first dust removal mechanism for removing dust from the activated waste gas is connected with the air inlet end of the heat accumulating type thermal oxidation furnace through a first fan, the air outlet end of the second dust remover for removing dust from the dry waste gas is connected with the air inlet end of the water washing tower through a second fan, the air outlet end of the heat accumulating type thermal oxidation furnace and the air outlet end of the water washing tower are both connected with the air inlet end of the absorption tower, and the air outlet end of the absorption tower is connected with the air inlet end of the adsorption box. The device has the advantages of simple structure, high purification efficiency of the powder activated carbon high-temperature thermal regeneration waste gas, stability and reliability, and the emission concentration of particulate matters, sulfur dioxide, nitrogen oxides, hydrogen chloride and non-methane total hydrocarbons in the discharged waste gas is lower than the limit value of the comprehensive emission standard of atmospheric pollutants.

Description

Powdered activated carbon high-temperature thermal regeneration waste gas purification equipment
Technical Field
The utility model relates to the field of industrial waste gas purification, in particular to powdered activated carbon high-temperature thermal regeneration waste gas purification equipment.
Background
The activated carbon is widely applied to the aspects of environmental protection, chemical industry, pharmacy, food processing, military, chemical protection and the like, wherein the water treatment is the largest market in application. The activated carbon shows excellent effect in treating low-concentration sewage. After biochemical effluent of urban sewage treatment plant is adsorbed by powdered activated carbon, COD of effluentCrCan be reduced to 30-35 mg/L, which is obviously lower than cityIndex of first class A of pollutant discharge standard of town sewage treatment plant. The repeated use of the regenerated powdered activated carbon is beneficial to saving resources and reducing the operation cost of enterprises. At present, the most effective method for regenerating powdered activated carbon for water treatment is high-temperature thermal regeneration which can be divided into three stages of drying, carbonization and activation, and waste gas generated in the regeneration process needs to be treated. The waste gas generated in the drying stage contains dust, water vapor, trace volatile phenol and other low-boiling point organic matters. The waste gas generated in the activation stage comprises dust and H2、CO、CH4、C2H4、CO2Nitrogen-containing organic substances such as dioxin and pyridine. The activated waste gas is characterized by low calorific value and reducibility. The traditional method for purifying the waste gas generated by the thermal regeneration of the powdered activated carbon discharges dry waste gas and activated waste gas into a secondary combustion chamber, and fuel and air are sprayed into the secondary combustion chamber for high-temperature incineration.
Patent 201810074630.1 proposes that the activated waste gas is dedusted by a bag-type dust collector and then combined with the dry waste gas, and the combined activated waste gas passes through a multi-stage alkali liquid absorption tower, a heat accumulation type thermal oxidation furnace, a multi-stage alkali liquid absorption tower and a high-voltage electrostatic demister in sequence, and is finally discharged in high altitude through a discharge fan and a chimney. This patent has the following disadvantages: firstly, a large amount of active carbon dust is carried in the dry waste gas, and if the dry waste gas directly enters the alkali liquor absorption tower, the recycled absorbent is seriously polluted, and even the absorption tower is blocked. (II) burning and decomposing nitrogen-containing organic matters in the waste gas in a regenerative thermal oxidation furnace to convert the nitrogen-containing organic matters into NO with low oxidation degreeXNO accounts for about 90%. Low solubility of NO in water, absorption of NO in alkali solutionXThe removal rate is only 50-60% (Lvquqiu. chemical industry general theory of environmental protection [ M ]]Beijing: chemical industry Press 1995, 100-. NO in exhaust gasXThe concentration may exceed the limit of the "integrated emission Standard for atmospheric pollutants".
Therefore, there is a need to design a powdered activated carbon high-temperature thermal regeneration exhaust gas purification device to overcome the above problems.
SUMMERY OF THE UTILITY MODEL
In order to avoid the problems, the powder activated carbon high-temperature thermal regeneration waste gas purification equipment is provided, the structure is simple, the purification efficiency of the powder activated carbon high-temperature thermal regeneration waste gas is high, the emission concentration of particulate matters, sulfur dioxide, nitrogen oxides, hydrogen chloride and non-methane total hydrocarbons in the discharged waste gas is lower than the limit value of the comprehensive emission standard of atmospheric pollutants, and the equipment is stable and reliable.
The utility model provides a powdered activated carbon high-temperature thermal regeneration waste gas purification device, which comprises: the device comprises a first dust removal mechanism, a first fan, a heat accumulating type thermal oxidation furnace, a second dust remover, a second fan, a water washing tower, an absorption tower and an adsorption box; the air outlet end of the first dust removal mechanism for removing dust from the activated waste gas is connected with the air inlet end of the heat accumulating type thermal oxidation furnace through a first fan, the air outlet end of the second dust remover for removing dust from the dry waste gas is connected with the air inlet end of the water washing tower through a second fan, the air outlet end of the heat accumulating type thermal oxidation furnace and the air outlet end of the water washing tower are both connected with the air inlet end of the absorption tower, and the air outlet end of the absorption tower is connected with the air inlet end of the adsorption box.
Preferably, the first dust removal mechanism includes a first dust remover and a dry filter that sequentially remove dust from the activated exhaust gas.
Preferably, the first precipitator and the second precipitator are both pulse bag precipitators.
Preferably, the activated waste gas dedusted by the first dedusting mechanism is introduced into the regenerative thermal oxidation furnace through a flame arrester by a first fan.
Preferably, the regenerative thermal oxidation furnace is a three-chamber type, is used for burning and degrading organic waste gas at high temperature, and has the oxidation temperature of 850-920 ℃.
Preferably, the absorption tower is a three-stage absorption tower, and the absorption liquid is a mixed aqueous solution of sodium hydroxide and sodium chlorite and is used for removing NOx and SO in the waste gas2、CO2HCl and trace low-boiling point organic matter, and the spraying density is 8-15 m3/(m2·h)。
Preferably, the adsorption tank is an activated carbon adsorption tank, and the air outlet end of the adsorption tank is connected with the exhaust funnel through a third fan.
Preferably, the adsorption tank is filled with honeycomb activated carbon or granular activated carbon.
Compared with the prior art, the utility model has the following beneficial effects: the device has the advantages of simple structure, high purification efficiency of the powder activated carbon high-temperature thermal regeneration waste gas, stability and reliability, and the emission concentration of particulate matters, sulfur dioxide, nitrogen oxides, hydrogen chloride and non-methane total hydrocarbons in the discharged waste gas is lower than the limit value of the comprehensive emission standard of atmospheric pollutants.
Drawings
FIG. 1 is a schematic structural view of a powdered activated carbon high-temperature thermal regeneration exhaust gas purification apparatus according to a preferred embodiment of the present invention;
FIG. 2 is a graph showing the results of exhaust gas pollutant concentration detection by sampling at the outlet of the exhaust stack;
detailed description of the embodiments reference is made to the accompanying drawings in which:
1. the device comprises a second dust remover, 2, a second fan, 3, a water washing tower, 4, a first dust remover, 5, a dry filter, 6, a first fan, 7, a thermal oxidation furnace, 8, an absorption tower, 9, an adsorption box, 10, a third fan, 11 and an exhaust funnel.
Detailed Description
The technical scheme of the utility model is clearly and completely described in the following with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a powdered activated carbon high-temperature thermal regeneration exhaust gas purification apparatus, including: the device comprises a first dust removal mechanism, a first fan 6, a heat accumulating type thermal oxidation furnace 7, a second dust remover 1, a second fan 2, a water washing tower 3, an absorption tower 8 and an adsorption box 9, wherein the gas outlet end of the first dust removal mechanism for removing dust from the activated waste gas is connected with the gas inlet end of the heat accumulating type thermal oxidation furnace 7 through the first fan 6, the gas outlet end of the second dust remover 1 for removing dust from the dry waste gas is connected with the gas inlet end of the water washing tower 3 through the second fan 2, the gas outlet end of the heat accumulating type thermal oxidation furnace 7 and the gas outlet end of the water washing tower 3 are both connected with the gas inlet end of the absorption tower 8, and the gas outlet end of the absorption tower 8 is connected with the gas inlet end of the adsorption box 9.
Wherein the first dust removal mechanism includes a first dust remover 4 and a dry filter 5 that remove dust from the activated exhaust gas in this order. The shell material of dry filter 5 is 304 stainless steel, and dry filter 5 includes three layers of filtration, and is in proper order for coarse filter, F7 level bag filtration and F9 level bag filtration.
And the first dust remover 4 and the second dust remover 1 are both pulse bag type dust removers. The vast majority of dust in the dry waste gas is intercepted by the second dust remover 1, the residual dust in the filtered waste gas is removed in the water washing tower 3, and the liquid-gas ratio of the water washing tower 3 is 1: 800 to 1000.
The activated waste gas dedusted by the first dedusting mechanism is introduced into the heat accumulating type thermal oxidation furnace 7 through the flame arrester by the first fan 6. The heat accumulating type thermal oxidation furnace 7 is a three-chamber type and is used for burning and degrading organic waste gas at high temperature, and the oxidation temperature is 850-920 ℃. During the purification treatment, H is contained2、CO、CH4、C2H4The activated waste gas of the organic odor enters a three-chamber heat accumulating type thermal oxidation furnace 7, flows through a heat accumulating chamber, is heated and then enters an oxidation chamber for incineration; the oxidation chamber of the thermal oxidation furnace 7 is filled with fuel gas and air, the oxidation temperature is 850-920 ℃, and the retention time is not less than 2 seconds. Volatile organic compoundsIs oxidatively decomposed in the oxidation chamber to generate NOx、SO2、CO2HCl, etc. Wherein the fuel gas is natural gas or liquefied petroleum gas. After the treatment of the heat accumulating type thermal oxidation furnace 7, the removal rate of volatile organic compounds reaches 98 percent, and the thermal efficiency of the thermal oxidation furnace 7 reaches 95 percent. The heat exchange medium of the heat storage chamber of the thermal oxidation furnace 7 is a ceramic heat storage body.
The absorption tower 8 is a three-stage absorption tower 8, and the mixed aqueous solution of sodium hydroxide and sodium chlorite is used as absorption liquid for removing NO in the waste gasX、SO2、CO2HCl and trace low-boiling point organic matter, and the spraying density is 8-15 m3/(m2H). In an alkaline medium, NO is oxidized into sodium nitrate and sodium nitrite by sodium chlorite, so that the NO is improved by the absorption tower 8XThe removal rate of (2).
2NO+NaClO2+2NaOH＝NaNO3+NaNO2+NaCl+H2O
And a trace amount of phenols in the dry waste gas are converted into sodium salt by the absorption liquid and absorbed and removed.
The oxidation-reduction potential (ORP) value of the absorption liquid is 400 mv-600 mv, the pH value of the absorption liquid is 7.5-10.0, and the removal rate of nitrogen oxides in the waste gas by the absorption tower 8 is 90% -95%.
Meanwhile, the effluent of the absorption tower 8 is collected into a circulating water tank, the circulating water tank is made of carbon steel lined with glass fiber reinforced plastics, a cooling tower is arranged above the circulating water tank, a dosing system is arranged on the circulating water tank, and the absorption liquid circularly flows between the absorption tower 8 and the circulating water tank. And the material of absorption tower 8 is glass steel, and absorption tower 8 is the packed tower, and every grade of packed tower is equipped with two-layer and sprays, and every grade of packed tower packs two-layer pall ring packing, and the upper portion of packed tower is installed the demister.
The adsorption tank 9 is an activated carbon adsorption tank 9, and the air outlet end of the adsorption tank 9 is connected with an exhaust funnel 11 through a third fan 10. The adsorption tank 9 is filled with honeycomb activated carbon or granular activated carbon. The material of the activated carbon adsorption tank 9 is 304 stainless steel. The activated carbon adsorption tank 9 is filled with honeycomb activated carbon or granular activated carbon, and the activated carbon adsorbs residual dioxin and nitrogen oxides in the exhaust gas, so that the exhaust gas is ensured to be discharged up to the standard.
Specifically, the activated waste gas is dedusted by a first deduster 4 and a dry filter 5, is guided into a three-chamber heat accumulating type thermal oxidation furnace 7 through a flame arrester for high-temperature incineration and degradation, is combined with the dry waste gas dedusted by a second deduster 1 and a water washing tower 3, sequentially enters a three-stage absorption tower 8 and an active carbon adsorption box 9, and is discharged in high altitude through a discharge fan and an exhaust funnel 11.
When the device is actually used, the purification method of the powdery activated carbon high-temperature thermal regeneration waste gas for sewage advanced treatment comprises the following steps:
1. activated waste gas G1 is introduced into a dry filter 5 for dust removal after activated carbon is recovered by a first dust remover 4, and is introduced into a three-chamber heat accumulating type thermal oxidation furnace 7 by a first fan 6 for high-temperature incineration and degradation after passing through a flame arrester. Natural gas and air are introduced into an oxidation chamber of the thermal oxidation furnace 7, the combustion temperature is 850 ℃, and the retention time is 2 seconds. The volatile organic compound removal rate is 98 percent after the treatment of the heat accumulating type thermal oxidation furnace 7; the thermal efficiency is 95%.
2. The dry waste gas G2 is dedusted by the second deduster 1, pressurized by the second fan 2 and then fed into the water washing tower 3 to remove dust and soluble organic matters in the dry waste gas.
3. The exhaust G1 of the regenerative thermal oxidation furnace 7 is combined with the pretreated dry exhaust G2 and is connected to a tertiary absorption tower 8. The mixed solution of sodium hydroxide and sodium chlorite is used as absorption liquid. The pH value of the absorption liquid is 7.5-10.0. The initial concentration of sodium chlorite in the absorption solution was 0.15 wt%. The oxidation-reduction potential (ORP) value of the absorption liquid is 400 mv-600 mv. The absorption liquid is in countercurrent contact with the waste gas, and the third-stage absorption tower 8 is a packed tower. Each stage of packed tower is provided with two layers of spraying, each stage of packed tower is filled with two layers of pall ring packing, and the upper part of the packed tower is provided with a demister. The removal rate of nitrogen oxides in the waste gas by the three-stage absorption tower 8 is 90-95%; SO in the waste gas is removed by the three-stage absorption tower 82、CO2And HCl. The moisture in the exhaust gas of the third-stage absorption tower 8 is less than 5%.
4. The waste gas from the absorption tower 8 enters an activated carbon adsorption box 9, the activated carbon adsorption box 9 is filled with granular activated carbon, the waste gas flows through an activated carbon layer, residual dioxin, nitric oxide and odor in the waste gas are trapped by the activated carbon, and the purified qualified tail gas is pressurized by a third fan 10 and is exhausted into the atmosphere from an outlet flue to an exhaust funnel 11.
Drying waste gas flow of powdery activated carbon thermal regeneration device for advanced sewage treatment of certain enterprise is 18500Nm3H, activated exhaust gas flow 6500Nm3H, total flow rate 25000Nm3The size of the water washing tower 3 is phi 1800 mm 6000mm, and the design water inlet flow of the water washing tower 3 is 20m3The liquid-gas ratio of the water washing tower 3 is 1: 900, spray density 8m3/(m2H). 6500Nm of designed waste gas flow of heat accumulating type thermal oxidation furnace 73The combustion temperature was 850 ℃ and the residence time was 2 seconds. The heat accumulating type thermal oxidation furnace 7 has the removal rate of 98 percent of volatile organic compounds and the thermal efficiency of 95 percent. The sizes of the first, second and third absorption towers 8 are phi 2400 x 7000mm, the absorption towers are made of glass fiber reinforced plastics, and the designed absorbent flow of each absorption tower 8 is 36m3H, spray density 8m3/(m2H). The removal rate of nitrogen oxides in the waste gas by the third-stage absorption tower 8 is 95%; the size of the activated carbon adsorption box 9 is 4000 x 1600 x 2000mm, and the volume space velocity is 2000hr-1。
And sampling the outlet of the exhaust funnel 11 to detect the concentration of the pollutants in the tail gas, wherein the detection result is shown in figure 2.
When the method is used for purifying the high-temperature thermal regeneration waste gas of the powdered activated carbon, the emission concentrations of particulate matters, sulfur dioxide, nitrogen oxides, hydrogen chloride and non-methane total hydrocarbons at the outlet of the exhaust funnel 11 are all lower than the emission limit value of the comprehensive emission standard of atmospheric pollutants.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. The utility model provides a powdered activated carbon high temperature thermal regeneration exhaust gas purification equipment which characterized in that includes: the device comprises a first dust removal mechanism, a first fan, a heat accumulating type thermal oxidation furnace, a second dust remover, a second fan, a water washing tower, an absorption tower and an adsorption box; the air outlet end of the first dust removal mechanism for removing dust from the activated waste gas is connected with the air inlet end of the heat accumulating type thermal oxidation furnace through a first fan, the air outlet end of the second dust remover for removing dust from the dry waste gas is connected with the air inlet end of the water washing tower through a second fan, the air outlet end of the heat accumulating type thermal oxidation furnace and the air outlet end of the water washing tower are both connected with the air inlet end of the absorption tower, and the air outlet end of the absorption tower is connected with the air inlet end of the adsorption box.
2. The powdered activated carbon high-temperature thermal regeneration exhaust gas purifying apparatus as set forth in claim 1, wherein: the first dust removal mechanism includes a first dust remover and a dry filter that remove dust from the activated exhaust gas in sequence.
3. The powdered activated carbon high-temperature thermal regeneration exhaust gas purifying apparatus as set forth in claim 2, wherein: the first dust remover and the second dust remover are both pulse bag type dust removers.
4. The powdered activated carbon high-temperature thermal regeneration exhaust gas purifying apparatus as set forth in claim 1, wherein: the activated waste gas dedusted by the first dedusting mechanism is guided into the heat accumulating type thermal oxidation furnace by the first fan through the flame arrester.
5. The powdered activated carbon high-temperature thermal regeneration exhaust gas purifying apparatus as set forth in claim 1, wherein: the heat accumulating type thermal oxidation furnace is a three-chamber type and is used for burning and degrading organic waste gas at high temperature.
6. The powdered activated carbon high-temperature thermal regeneration exhaust gas purifying apparatus as set forth in claim 1, wherein: the absorption tower is a three-stage absorption tower and is used for removing NO in the waste gasx、SO2、CO2HCl and trace amounts of low boiling point organics.
7. The powdered activated carbon high-temperature thermal regeneration exhaust gas purifying apparatus as set forth in claim 1, wherein: the adsorption tank is an activated carbon adsorption tank, and the air outlet end of the adsorption tank is connected with the exhaust funnel through a third fan.
8. The powdered activated carbon high-temperature thermal regeneration exhaust gas purifying apparatus as set forth in claim 1, wherein: the adsorption tank is filled with honeycomb activated carbon or granular activated carbon.
CN202121579011.1U 2021-07-12 2021-07-12 Powdered activated carbon high-temperature thermal regeneration waste gas purification equipment Active CN216023924U (en)

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