CN212701965U - Device for efficient regeneration and waste gas treatment of powdered activated carbon - Google Patents
Device for efficient regeneration and waste gas treatment of powdered activated carbon Download PDFInfo
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- CN212701965U CN212701965U CN202021063531.2U CN202021063531U CN212701965U CN 212701965 U CN212701965 U CN 212701965U CN 202021063531 U CN202021063531 U CN 202021063531U CN 212701965 U CN212701965 U CN 212701965U
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Abstract
The utility model belongs to the technical field of industrial equipment and process, in particular to a device for high-efficiency regeneration and waste gas treatment of powdered activated carbon, which comprises a biodegradation tank, a spiral shell stacking dehydrator, a dryer and a modular regeneration furnace which are sequentially communicated; the device also comprises a waste gas heat exchanger, a pulse bag type dust collector, a heat storage incinerator, an oxidation reactor, an alkali liquor spray tower, a powder activated carbon adsorption tower and a chimney which are sequentially communicated; the dryer and the modular regenerative furnace are both communicated with the waste gas heat exchanger; the biodegradation tank is provided with a microorganism adding device; the heat accumulation incinerator is provided with a reducing agent feeding device. The utility model discloses a device degree of automation is high, can retrieve heat energy, emission tail gas up to standard by great degree, and can realize powdered activated carbon high efficiency regeneration and exhaust-gas treatment in succession.
Description
Technical Field
The utility model belongs to the technical field of industrial equipment and technology, concretely relates to a device for powdered activated carbon high efficiency regeneration and exhaust-gas treatment.
Background
Powdered activated carbon is widely used in the fields of industry and environmental protection due to good adsorption performance, and cannot be used continuously after being saturated in adsorption, so that secondary pollution can be caused by improper disposal, the activated carbon with saturated adsorption is treated as hazardous waste, the treatment price of each ton is up to 3000 yuan along with the increasing strictness of environmental protection policies, the use cost is greatly increased, and many enterprises develop technical researches related to the regeneration of saturated powdered activated carbon in order to realize the reasonable utilization of resources.
The powdered activated carbon has small particle size, so that materials are easy to lose during regeneration, and the current common carbon regeneration process at home and abroad comprises the following steps: the method comprises the following steps of traditional kiln thermal regeneration, wet oxidation regeneration, microwave regeneration, photocatalytic regeneration, full-automatic high-temperature regeneration and the like. The heat regeneration time of the traditional furnace kiln generally exceeds 24 hours, the environmental pollution is large, the labor intensity is high, the regeneration efficiency is low, and the automation degree is low; the wet oxidation regeneration method has small occupied area and short regeneration time, but adopts high-temperature and high-pressure operation environment with higher investment, higher running cost, extremely complex equipment maintenance and secondary pollution caused by using the catalyst; the microwave regeneration method has short regeneration time and good effect, but has expensive investment, higher energy consumption and smaller regeneration scale, and can not meet the requirements of large-scale activated carbon regeneration projects; the photocatalytic regeneration method is an environment-friendly method, but the method has long regeneration time and low regeneration efficiency, and the same batch of carbon needs to be repeatedly regenerated for many times, so that the standard and the requirement of industrial production are difficult to meet. Compared with the process, the full-automatic high-temperature regeneration furnace has the advantages of short regeneration time, high regeneration efficiency, small occupied area, convenience in maintenance, high automation degree, suitability for large-scale carbon regeneration and the like.
The high temperature of more than 700 ℃ in the regeneration process of the powdered activated carbon can cause the massive pyrolysis of organic pollutants adsorbed by the carbon to generate organic waste gas with a certain concentration, and an effective tail gas treatment facility must be configured for the waste gas to avoid the secondary pollution of the waste gas to the environment; otherwise, the process advantages of the high-temperature regenerating furnace cannot be exerted, so that the process is limited due to cracking of waste gas when the process is widely applied at home and abroad.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device for high-efficient regeneration of powdered activated carbon and exhaust-gas treatment, degree of automation is high, can great degree retrieve heat energy, discharge tail gas up to standard, and can realize powdered activated carbon high-efficient regeneration and exhaust-gas treatment in succession.
The utility model discloses the scheme that the realization purpose adopted is: a device for high-efficiency regeneration and waste gas treatment of powdered activated carbon comprises a biodegradation tank, a spiral-stacked dehydrator, a dryer and a modular regeneration furnace which are sequentially communicated; the device also comprises a waste gas heat exchanger, a pulse bag type dust collector, a heat storage incinerator, an oxidation reactor, an alkali liquor spray tower, a powder activated carbon adsorption tower and a chimney which are sequentially communicated; the dryer and the modular regenerative furnace are both communicated with the waste gas heat exchanger; the biodegradation tank is provided with a microorganism adding device; the heat accumulation incinerator is provided with a reducing agent feeding device.
Preferably, a stainless steel stirrer is arranged in the biodegradation tank.
Preferably, the dryer is a paddle dryer, the rotating speed is 10-20r/min, and the heat transfer area is 25-35m2Effective volume of 1.0-1.9m3And the power is 11-15 kw.
Preferably, the modular regenerative furnace is composed of a plurality of high-temperature resistant components, and the single high-temperature resistant component is detachable.
Preferably, a ceramic heat accumulator is arranged in the regenerative incinerator for heat accumulation.
Preferably, the bottom of the oxidation reactor is provided with an air pipe, and the outer wall of the oxidation reactor is provided with a jacket cooling water device.
Preferably, the top of the alkali liquor spray tower is provided with a sodium hydroxide adding device.
Preferably, the waste gas heat exchanger, the modular regenerator, the pulse bag type dust collector, the heat storage incinerator, the oxidation reactor, the alkali liquor spray tower, the centrifugal fan, the powder activated carbon adsorption tower and the chimney are communicated through air pipes.
The utility model has the advantages of it is following and beneficial effect:
compared with the traditional powdered activated carbon regeneration process, the device for the efficient regeneration and the waste gas treatment of the powdered activated carbon can continuously and fully automatically carry out the regeneration treatment of large-scale powdered activated carbon, the process combining biological regeneration and high-temperature regeneration can obtain higher regeneration efficiency and lower material loss compared with the traditional process, and the adsorption capacity of the treated powdered activated carbon reaches or even exceeds the adsorption capacity of new carbon; adopt thermal storage oxidation to burn, air oxidation, alkali lye to spray, a series of processes such as active carbon adsorption to the tail gas that produces like nitrogen oxide, sulfur dioxide etc. in the high temperature process have carried out multistage effectual processing to carry out maximum recovery to heat energy, the utility model discloses regeneration effect is good, take up an area of less, running cost is lower, degree of automation is high, the module is maintained conveniently, tail gas nitrogen oxide content is low, avoided secondary pollution, applicable in continuous big batch industrial production.
The utility model has the advantages of high-efficiency regeneration, high automation degree, capability of recovering heat energy to a greater extent, standard tail gas emission and continuous realization of high-efficiency regeneration and waste gas treatment of powdered activated carbon; the powdered activated carbon regenerated by the method can be recycled, so that the use cost is greatly saved.
Drawings
FIG. 1: the system structure chart of the embodiment 1 of the utility model;
FIG. 2: the utility model discloses embodiment 2's process flow diagram.
In the figure, 1, a biodegradation tank; 2. a microorganism adding device; 3. a carbon slurry delivery pump; 4. a spiral shell stacking dehydrator; 5. a feeding auger; 6. a dryer; 7. an exhaust gas heat exchanger; 8. a modular regenerative furnace; 9. a pulse bag type dust collector; 10. a regenerative incinerator; 11. a reducing agent feeding device; 12. an oxidation reactor; 13. an alkali liquor spray tower; 14. a centrifugal fan; 15. a powdered activated carbon adsorption tower; 16. a chimney; 17. a stirrer; 18. a high temperature resistant component; 19. a ceramic heat accumulator; 20. an air tube; 21. jacket cooling water devices; 22. a sodium hydroxide adding device; 23. and (7) an air pipe.
Detailed Description
For better understanding of the present invention, the following examples are further illustrative of the present invention, but the present invention is not limited to the following examples.
Example 1
As shown in figure 1, the embodiment provides a device for efficient regeneration of powdered activated carbon and waste gas treatment, which comprises a biodegradation tank 1, a microorganism adding device 2, a carbon slurry conveying pump 3, a spiral-stacked dehydrator 4, a feeding auger 5, a dryer 6, a waste gas heat exchanger 7, a modular regeneration furnace 8, a pulse bag type dust collector 9, a regenerative incinerator 10, a reducing agent adding device 11, an oxidation reactor 12, an alkali liquor spray tower 13, a centrifugal fan 14, a powdered activated carbon adsorption tower 15, a chimney and a chimney16; the used saturated powdered activated carbon is firstly discharged into a biodegradation tank 1, microbial degradation liquid with certain concentration is added through a microbial adding device 2, the powdered activated carbon is subjected to biodegradation regeneration, the adsorption capacity of the powdered activated carbon is recovered to 25-30%, and the treated carbon slurry is conveyed to a spiral-stacked dehydrator 4 through a carbon slurry conveying pump 3 for mechanical dehydration; the dehydrated wet carbon powder is conveyed to a dryer 6 for drying through a feeding auger 5, and the dried carbon powder is conveyed to a modular regeneration furnace 8 for full-automatic high-temperature regeneration through the feeding auger 5. The treated powdered activated carbon recovers the initial adsorption performance and can be recycled. Waste gas generated by gradual cracking of organic matters adsorbed by the carbon powder at high temperature in the dryer 6 and the modular regenerative furnace 8 firstly enters the waste gas heat exchanger 7 for heat exchange, the temperature of the waste gas is reduced to 50-100 ℃, and then the waste gas enters the pulse bag type dust collector 9 for dust collection, a small amount of carbon powder in the waste gas is separated, and the carbon powder enters the front end of the modular regenerative furnace 8; the dedusted waste gas enters a regenerative incinerator 10 to be subjected to oxidative decomposition of organic waste gas at high temperature, a liquid ammonia reducing agent is sprayed into the incinerator by a reducing agent adding device 11 in the regenerative incinerator 10 to remove nitrogen oxides in the waste gas, the denitrated waste gas enters an oxidation reactor 12, and air is introduced to oxidize NO into NO2Then enters the alkali liquor spray tower 13 to remove acid gas such as NO in the waste gas2、SO2And (3) neutralizing and absorbing, conveying the treated waste gas to a powdered activated carbon adsorption tower 15 through a centrifugal fan 14 to adsorb residual pollutants, and finally discharging the waste gas to reach the comprehensive emission standard of atmospheric pollutants (GB16297-1996) and discharging the waste gas to the atmosphere through a chimney 16.
The biodegradation tank 1 of this embodiment is further provided with a stainless steel stirrer 17 for uniform mixing of the microorganisms and the carbon powder.
The dryer 6 of the embodiment is a paddle dryer, the rotating speed is 10-20r/min, the heat transfer area is 25-35m2, the effective volume is 1.0-1.9m3, and the power is 11-15 kw.
The modular regeneration furnace 8 of the embodiment is composed of 6 high-temperature resistant components 18 in a combined mode, and the single high-temperature resistant component 18 can be flexibly disassembled.
The pulse bag type dust collector 9 of the embodiment adopts PTFE composite filter materials, and can resist the high temperature of 150 ℃.
The regenerative thermal oxidizer 10 of this embodiment is provided with a special ceramic heat storage body 19 for heat storage.
The bottom of the oxidation reactor 12 of the embodiment is also provided with an air pipe 20 for further oxidation of NO; the outer layer of the oxidation reactor 12 is also provided with a jacket cooling water device 21.
The top of the alkali liquor spray tower 13 of this embodiment is further provided with a sodium hydroxide adding device 22.
The waste gas heat exchanger 7, the modular regenerator 8, the pulse bag type dust collector 9, the regenerative thermal oxidizer 10, the oxidation reactor 12, the alkali liquor spray tower 13, the centrifugal fan 14, the powdered activated carbon adsorption tower 15 and the chimney 16 of the embodiment are all connected by an air pipe 23.
The utility model discloses carried out full-automatic biological regeneration + thermal regeneration to saturated powdered activated carbon and handled, carried out innocent treatment to the tail gas that pyrolysis produced simultaneously, had that regeneration efficiency is high, degree of automation is high, heat recovery rate is high, tail gas concentration is low, avoid secondary pollution, produced powder charcoal each item performance all can reach or exceed advantages such as new charcoal standard, and its technical principle is as follows:
the saturated powdered activated carbon is firstly biodegraded, microbial powder with a certain concentration is added into the biodegradation tank 1, organic matters adsorbed on the surface and in the powdered activated carbon are degraded through the biochemical action of microorganisms, the activated carbon can be partially desorbed, and finally, the adsorption capacity of the powdered activated carbon is recovered to about 25-30%. The biodegradable powdered activated carbon is dehydrated, enters a full-automatic modular regeneration furnace 8, organic matters adsorbed by the powdered activated carbon are gradually cracked at the high temperature of 800-850 ℃ to form waste gas to be discharged, the whole process can be automatically controlled by a PLC (programmable logic controller), the feeding, heating, discharging and tail gas collection are automatically realized, and the regenerated powdered activated carbon recovers the adsorption performance and can be recycled.
For the high-temperature tail gas at the outlet of the dryer 6 and the full-automatic modular regenerative furnace 8, the temperature is firstly reduced through the waste gas heat exchanger 7, and the maximum distance isThe heat energy is recycled, and the heat energy can be used as a supplementary heat source of the dryer 6 or other heating devices, so that the energy consumption is saved. Low-temperature waste gas is dedusted and then enters a regenerative incinerator 10 with a built-in ceramic heat accumulator 19, the temperature of the waste gas reaches about 750 ℃ under the action of fuel, the waste gas is subjected to thermal oxidation decomposition, organic matters contained in the waste gas are fully oxidized and decomposed, a liquid ammonia reducing agent is sprayed into an oxidation chamber of a furnace body to perform SNCR (selective non catalytic reduction) denitration, and NO in the waste gas are subjected to oxidation reduction reaction2Reduction to harmless N2The treated exhaust gas enters the oxidation reactor 12 due to NO2Unstable at high temperature, the gas is firstly cooled, and then air is introduced to further oxidize NO which is not completely reacted in the previous process to generate NO which is easily dissolved in water2Then the tail gas enters an alkali liquor spray tower 13, sodium hydroxide solution with certain concentration is sprayed on the tower top, and acid gas such as NO in the tail gas is treated2、SO2And the like, to be absorbed and removed. And finally, tail gas enters a powdered activated carbon adsorption tower 15, a small amount of residual organic matters after a series of front-end working procedures are deeply adsorbed by utilizing the excellent adsorption performance of the powdered activated carbon, and finally the tail gas reaches the standard and is discharged.
Example 2
As shown in fig. 2, the present embodiment provides a method for efficient regeneration of powdered activated carbon and treatment of exhaust gas, comprising the steps of:
step 1: the used saturated powdered activated carbon is firstly discharged into a biodegradation tank 1, a microorganism degradation liquid with a certain concentration is added through a microorganism adding device 2, the powdered activated carbon is subjected to biodegradation regeneration, the adsorption capacity of the powdered activated carbon is recovered by 25-30%, and the treatment load of subsequent thermal regeneration is reduced; the carbon slurry in the biodegradation tank 1 stays for 24-30 hours, the biodegradation reaction temperature is 15-25 ℃, and the PH value is controlled to be 5.0-8.0, so that the optimal degradation effect on the adsorbed organic matters in the carbon slurry is obtained.
Step 2: conveying the biologically regenerated carbon slurry to a spiral shell stacking dehydrator 4 through a carbon slurry conveying pump 3 for mechanical dehydration to reduce the water content to 50-55%; the dehydrated wet carbon powder is sent to a dryer 6 through a feeding auger 5 for rapid drying, the heating temperature is 260-330 ℃, and the drying time is 30-45min, so that the water content is reduced to below 1%; in the drying process, a part of organic matters adsorbed in the powdered activated carbon is cracked to form organic waste gas to be discharged due to high temperature.
And step 3: and the dried carbon powder is conveyed to a modular regeneration furnace 8 through the feeding auger 5 for full-automatic high-temperature regeneration, air is isolated, the regeneration temperature in the furnace is 800-850 ℃, the regeneration time is 120-180min, and organic pollutants adsorbed by the powdered activated carbon are gradually cracked at high temperature to form waste gas to be discharged. The treated powdered activated carbon recovers the initial adsorption performance and can be recycled.
And 4, step 4: in the dryer 6 and the modular regenerative furnace 8, the organic matters adsorbed by the carbon powder are gradually cracked at high temperature to generate waste gas, and the waste gas enters the waste gas heat exchanger 7 for heat exchange to reduce the temperature of the waste gas to 50-100 ℃.
And 5: the cooled waste gas enters a pulse bag type dust collector 9 for dust removal, a small amount of carbon powder in the waste gas is separated, and the carbon powder enters the front end of the modular regeneration furnace 8; the dedusted exhaust gas enters the regenerative incinerator 10.
Step 6: the waste gas is oxidized and decomposed at high temperature in the regenerative incinerator 10, the ignition temperature in the incinerator is 700 ℃, and the treatment air volume range is 5000-10000Nm3And h, spraying a liquid ammonia reducing agent into the furnace by using a reducing agent adding device 11 to remove nitrogen oxides in the waste gas, wherein the temperature of the outlet waste gas is about 100 ℃.
And 7: and (3) enabling the denitrated waste gas to enter an oxidation reactor 12, cooling the waste gas in the oxidation reactor 12 through a jacket cooling water device 21, introducing air to oxidize NO into NO2, wherein the temperature of the oxidation reaction is 30-50 ℃, and the reaction time is 1.0-2.0 hours. Then enters an alkali liquor spray tower 13, and acidic gases such as NO2, SO2 and the like in the waste gas are neutralized and absorbed by spraying sodium hydroxide solution with certain concentration at the top.
And 8: the treated waste gas is conveyed to a powdered activated carbon adsorption tower 15 through a centrifugal fan 14, the residual pollutants in the gas are adsorbed through the built-in powdered activated carbon, and finally the discharged waste gas can meet the integrated emission standard of atmospheric pollutants (GB16297-1996) and is discharged to the atmosphere through a chimney 16. The powdered activated carbon filled in the powdered activated carbon adsorption tower 15 is replaced for 1 time in 3 months, and the powdered activated carbon with saturated adsorption can be regenerated and reused.
Although the terms of the biodegradation tank 1, the microorganism adding device 2, the carbon slurry delivery pump 3, the spiral-stacked dehydrator 4, the feeding auger 5, the dryer 6, the waste gas heat exchanger 7, the modular regenerator 8, the pulse bag type dust collector 9, the regenerative incinerator 10, the reducing agent adding device 11, the oxidation reactor 12, the alkali liquor spray tower 13, the centrifugal fan 14, the powdered activated carbon adsorption tower 15, the chimney 16, the stainless steel stirrer 17, the high temperature resistant component 18, the ceramic heat accumulator 19, the air pipe 20, the jacket cooling water device 21, the sodium hydroxide adding device 22, the air pipe 23 and the like are used more frequently in the present specification, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe the nature of the invention and should not be construed as imposing any additional limitations thereon which would depart from the spirit of the invention.
It should be understood that parts of the specification not set forth in detail are well within the prior art. While the foregoing is directed to the preferred embodiment of the present invention, it will be understood that the invention is not limited thereto, and that various modifications and changes can be made by those skilled in the art without departing from the principles of the invention.
Claims (8)
1. The utility model provides a device that is used for high-efficient regeneration of powdered activated carbon and exhaust-gas treatment which characterized in that: comprises a biodegradation tank (1), a spiral-stacked dehydrator (4), a dryer (6) and a modular regenerative furnace (8) which are communicated in sequence; the device also comprises a waste gas heat exchanger (7), a pulse bag type dust collector (9), a heat storage incinerator (10), an oxidation reactor (12), an alkali liquor spray tower (13), a powder activated carbon adsorption tower (15) and a chimney (16) which are communicated in sequence; the dryer (6) and the modular regenerative furnace (8) are both communicated with the waste gas heat exchanger (7); the biodegradation tank (1) is provided with a microorganism adding device (2); the regenerative incinerator (10) is provided with a reducing agent feeding device (11).
2. The apparatus for efficient regeneration of powdered activated carbon and treatment of exhaust gas according to claim 1, wherein: a stainless steel stirrer (17) is arranged in the biodegradation tank (1).
3. The apparatus for efficient regeneration of powdered activated carbon and treatment of exhaust gas according to claim 1, wherein: the dryer (6) is a paddle type dryer, the rotating speed is 10-20r/min, and the heat transfer area is 25-35m2Effective volume of 1.0-1.9m3And the power is 11-15 kw.
4. The apparatus for efficient regeneration of powdered activated carbon and treatment of exhaust gas according to claim 1, wherein: the modular regeneration furnace (8) is formed by combining a plurality of high-temperature resistant components (18), and the single high-temperature resistant component (18) can be detached.
5. The apparatus for efficient regeneration of powdered activated carbon and treatment of exhaust gas according to claim 1, wherein: a ceramic heat accumulator (19) is arranged in the heat accumulation incinerator (10) for heat accumulation.
6. The apparatus for efficient regeneration of powdered activated carbon and treatment of exhaust gas according to claim 1, wherein: an air pipe (20) is arranged at the bottom of the oxidation reactor (12), and a jacket cooling water device (21) is arranged on the outer wall of the oxidation reactor (12).
7. The apparatus for efficient regeneration of powdered activated carbon and treatment of exhaust gas according to claim 1, wherein: and a sodium hydroxide adding device (22) is arranged at the top of the alkali liquor spray tower (13).
8. The apparatus for efficient regeneration of powdered activated carbon and treatment of exhaust gas according to claim 1, wherein: the waste gas heat exchanger (7), the modular regenerative furnace (8), the pulse bag type dust collector (9), the heat storage incinerator (10), the oxidation reactor (12), the alkali liquor spray tower (13), the centrifugal fan (14), the powder activated carbon adsorption tower (15) and the chimney (16) are communicated through air pipes (23).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115945062A (en) * | 2023-02-08 | 2023-04-11 | 安道麦安邦(江苏)有限公司 | Waste gas treatment method and system in process of producing clethodim emulsifiable concentrate |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115945062A (en) * | 2023-02-08 | 2023-04-11 | 安道麦安邦(江苏)有限公司 | Waste gas treatment method and system in process of producing clethodim emulsifiable concentrate |
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Address after: 430074 No. 3 Huangjiahu University Town, Hongshan District, Wuhan City, Hubei Province Patentee after: Junji Environmental Technology Co.,Ltd. Address before: 430074 No. 3 Huangjiahu University Town, Hongshan District, Wuhan City, Hubei Province Patentee before: HUBEI JUNJI WATER TREATMENT Co.,Ltd. |
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