CN112044250A - Comprehensively-utilized activated carbon desulfurization and denitrification system and method - Google Patents

Comprehensively-utilized activated carbon desulfurization and denitrification system and method Download PDF

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CN112044250A
CN112044250A CN201910485646.6A CN201910485646A CN112044250A CN 112044250 A CN112044250 A CN 112044250A CN 201910485646 A CN201910485646 A CN 201910485646A CN 112044250 A CN112044250 A CN 112044250A
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activated carbon
flue gas
active carbon
conveying
fluidized bed
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刘旭华
李勇
刘昌齐
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Hunan Zhongye Changtian Energy Conservation And Environmental Protection Technology Co ltd
Zhongye Changtian International Engineering Co Ltd
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Hunan Zhongye Changtian Energy Conservation And Environmental Protection Technology Co ltd
Zhongye Changtian International Engineering Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/76—Gas phase processes, e.g. by using aerosols
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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Abstract

The invention discloses a comprehensive utilization active carbon desulfurization and denitrification system and method. The discharge port of the activated carbon desorption tower is provided with an activated carbon vibrating screen connected with an activated carbon powder bin, and the activated carbon powder bin is connected to an activated carbon powder storage and conveying system; the bottom of the circulating fluidized bed device is provided with an activated carbon powder spraying device connected with an activated carbon powder storage and conveying system; the exhaust port of the circulating fluidized bed device is connected to the air inlet of the bag-type dust collector; the air outlet of the bag-type dust collector is connected to the air inlet of the activated carbon adsorption tower. The invention replaces a primary active carbon adsorption tower with a circulating fluidized bed device and a bag-type dust collector, simultaneously adds a waste carbon powder collecting and utilizing device, and is assisted with ammonia spraying equipment and the like to reduce investment and operation cost, and the invention has simple process, safe production and less pollutants.

Description

Comprehensively-utilized activated carbon desulfurization and denitrification system and method
Technical Field
The invention relates to an activated carbon flue gas purification process, in particular to a system and a method for desulfurization and denitrification of activated carbon by comprehensive utilization, and belongs to the field of comprehensive treatment of flue gas pollutants.
Background
The activated carbon desulfurization has the advantages of high desulfurization rate, realization of denitration, dioxin removal, dust removal, no generation of waste water and waste residue and the like, so that the activated carbon desulfurization and denitration process is an ideal scheme for industrial flue gas, particularly sintered pellet flue gas in the steel industry.
The active carbon which adsorbs the pollutants in the active carbon adsorption tower is conveyed to the active carbon desorption tower by a conveying device from the active carbon adsorption tower to the active carbon desorption tower. Activated carbon high temperature regeneration in the analytic tower, the active carbon after the regeneration is carried to reuse in the active carbon adsorption tower by active carbon analytic tower to active carbon adsorption tower conveyor again, has the active carbon dust to produce in active carbon transportation process, and these dusts are collected to the active carbon dust removal sack cleaner by dust pelletizing system. Generally, these activated carbon powders are utilized as fuel. Part of the activated carbon is crushed or even extruded and abraded into powder in the activated carbon adsorption tower and the activated carbon desorption tower due to gravity; meanwhile, part of the activated carbon is pressed by moving equipment (such as a rotary valve) in the activated carbon adsorption tower and the activated carbon desorption tower and is also changed into powder, so an activated carbon vibrating screen is required to be arranged at a discharge port of the activated carbon desorption tower to screen out the powder and fine activated carbon particles. The screened activated carbon powder and particles are sent to an activated carbon powder bin for storage, and the activated carbon is also used as fuel.
At present, the methodThe emission requirements of atmospheric pollutants in the steel industry are increasingly strict, and the requirements of parts of regions meet the ultralow emission standard. The traditional activated carbon desulfurization and denitrification process can meet the requirement of ultralow emission only by adopting two-stage activated carbon adsorption. The flue gas of the traditional active carbon desulfurization process is introduced into a primary active carbon adsorption tower by a booster fan, and mixed gas of ammonia gas and air is sprayed into the tower inlet to improve NOXThe flue gas after primary purification enters a secondary activated carbon adsorption tower, mixed gas of ammonia and air is sprayed into the tower inlet of the secondary activated carbon adsorption tower, and the flue gas after secondary purification is sent to a chimney for emission.
The active carbon absorbed with the pollutants is discharged from the bottom of the active carbon adsorption tower and is conveyed to the active carbon desorption tower through the active carbon adsorption tower to the active carbon desorption tower conveying device. The function of the desorption tower is to recover the activity of the activated carbon and release or decompose harmful substances. SO in a stripper2Is released by high-temperature analysis to obtain SO-rich gas2The gas is sent to an acid making system to make high-concentration sulfuric acid. The waste water produced in the acid making process enters a waste water treatment system for treatment, and the investment cost is high.
The invention adopts the circulating fluidized bed device with lower investment and the bag-type dust collector to replace a primary active carbon adsorption tower, can also meet the requirement of ultralow emission, and can utilize active carbon powder generated in the active carbon conveying process and spray the wastewater generated in acid making into the circulating fluidized bed device for desulfurization, thereby greatly reducing the investment and the operation cost.
Disclosure of Invention
Aiming at the defects of the prior art and overcoming the technical problems of unreasonable utilization of waste carbon powder, high investment cost of desulfurization and denitrification, wide equipment floor area, unsatisfactory waste flue gas purification effect and the like in the prior art, the active carbon desulfurization and denitrification system and the method which use a circulating fluidized bed device and a bag-type dust collector to replace a primary active carbon adsorption tower, simultaneously increase a waste carbon powder collecting and utilizing device, and use ammonia spraying equipment and the like to reduce investment and operation cost, have simple process and safe production and can achieve the comprehensive utilization of national ultralow emission standard are provided.
In order to achieve the purpose, the invention provides the following specific technical scheme:
according to a first embodiment of the invention, a comprehensive utilization activated carbon desulfurization and denitrification system is provided:
this active carbon SOx/NOx control system includes: the device comprises an active carbon powder storage and conveying system, a circulating fluidized bed device, a bag-type dust collector, an active carbon adsorption tower, an active carbon desorption tower, an active carbon vibrating screen and an active carbon powder bin. Wherein: the active carbon bin outlet of active carbon adsorption tower is connected with the active carbon feed inlet of active carbon desorption tower through first active carbon conveyor. An active carbon discharge port of the active carbon desorption tower is connected with an active carbon feed port of the active carbon adsorption tower through a second active carbon conveying device; an active carbon vibrating screen is arranged between the active carbon discharge port of the active carbon desorption tower and the second active carbon conveying device. The active carbon vibrating screen is connected with an active carbon powder bin, and the active carbon powder bin is connected to an active carbon powder storage and conveying system. The bottom of the circulating fluidized bed device is provided with an activated carbon powder spraying device and a flue gas inlet, and an activated carbon powder storage and conveying system is connected with the activated carbon powder spraying device. The flue gas conveying pipe is connected to the flue gas inlet. An exhaust port of the circulating fluidized bed device is connected to an air inlet of the bag-type dust collector through a first conveying pipeline; the air outlet of the bag-type dust collector is connected to the air inlet of the active carbon adsorption tower through a second conveying pipeline.
Preferably, the system further comprises a dust collection system. The first active carbon conveying device is arranged above the position of an active carbon discharge port of the active carbon adsorption tower and is provided with a dust collector. The first active carbon conveying device is arranged above an active carbon feeding hole of the active carbon desorption tower and is provided with a dust collector. And a dust collector is arranged above the position of the active carbon feed inlet of the active carbon adsorption tower of the second active carbon conveying device. And a dust collector is arranged above the active carbon vibrating screen.
Preferably, the dust collector is connected to the inlet of the dust collection system, and the outlet of the dust collection system is connected to the activated carbon powder storage and delivery system through a dust delivery pipe.
Preferably, the activated carbon desorption tower is provided with an SRG gas outlet, and the SRG gas outlet is connected to the acid making system through an SRG gas conveying pipeline.
Preferably, the bottom of the circulating fluidized bed device is also provided with an acid making wastewater spraying device, and an acid making wastewater outlet of the acid making system is communicated to the acid making wastewater spraying device through a wastewater conveying pipeline.
Preferably, the system further comprises a flue gas cooling system. The flue gas cooling system is arranged on the flue gas conveying pipeline.
Preferably, the system further comprises a first ammonia gas injection device. The first ammonia gas injection device is arranged on the flue gas conveying pipeline and is positioned at the downstream of the flue gas cooling system.
Preferably, the system further comprises a second ammonia gas injection device. The second ammonia gas injection device is arranged on the second conveying pipeline.
Preferably, the system further comprises a booster fan. The booster fan is arranged on the second conveying pipeline and is positioned at the upstream of the second ammonia gas injection device.
Preferably, the dust collection system comprises a second bag-type dust collector and a dust removal fan. The dust removal fan is connected with the second bag-type dust remover. The dust collector is connected to the feed inlet of the second bag-type dust collector, and the discharge outlet of the second bag-type dust collector is connected to the activated carbon powder storage and conveying system through a dust conveying pipe.
According to a second embodiment of the present invention, there is provided a method for desulfurization and denitrification (raw flue gas treatment) by using the integrated activated carbon desulfurization and denitrification system according to the first embodiment of the present invention, comprising the steps of:
1) the original flue gas is conveyed to a flue gas inlet of the circulating fluidized bed device through a flue gas conveying pipeline for desulfurization treatment, and the flue gas after desulfurization treatment is conveyed to a bag-type dust remover through a first conveying pipeline for dust removal and secondary desulfurization. Flue gas after dust removal and secondary desulfurization by the bag-type dust remover is conveyed to the activated carbon adsorption tower through a second conveying pipeline for denitration treatment, and the flue gas after denitration treatment of the activated carbon adsorption tower is clean flue gas.
2) The active carbon is delivered to the active carbon adsorption tower through the second active carbon delivery device after being analyzed and activated by the active carbon analysis tower, the active carbon adsorbs pollutants in the active carbon adsorption tower, and the active carbon adsorbed with the pollutants is delivered to the active carbon analysis tower through the first active carbon delivery device for analysis and activation, and the operation is circulated.
Preferably, the activated carbon desorbed and activated by the activated carbon desorption tower is screened by an activated carbon vibrating screen, and the granular activated carbon sieved by the activated carbon vibrating screen is conveyed to the activated carbon adsorption tower by a second activated carbon conveying device.
Preferably, the activated carbon powder obtained by screening through the activated carbon vibrating screen enters an activated carbon powder bin, and the activated carbon in the activated carbon powder bin is conveyed to an activated carbon powder storage and conveying system through a dust conveying pipeline.
Preferably, the activated carbon in the activated carbon powder storage and conveying system is conveyed to an activated carbon powder spraying device at the bottom of the circulating fluidized bed device.
Preferably, the method further comprises the steps of:
3) the dust collector in the dust collecting system collects activated carbon dust above the position of an activated carbon discharge port of the activated carbon adsorption tower, above the position of an activated carbon feed inlet of the activated carbon desorption tower, above the position of an activated carbon feed inlet of the activated carbon adsorption tower and above the activated carbon vibrating screen.
Preferably, the dust collected by the dust collection system is transported to the activated carbon powder storage and transportation system through a dust transportation pipeline.
Preferably, the method further comprises the steps of:
4) SRG gas generated by the activated carbon desorption tower is connected to an acid making system through an SRG gas conveying pipeline. Acid-making wastewater generated by the acid-making system is communicated to an acid-making wastewater spraying device of the circulating fluidized bed device through a wastewater conveying pipeline, and the acid-making wastewater and activated carbon powder are used for carrying out desulfurization treatment on raw flue gas in the circulating fluidized bed device and the bag-type dust collector.
Preferably, a flue gas cooling system is arranged on the flue gas conveying pipeline, and the raw flue gas is cooled by the flue gas cooling system and then conveyed to a flue gas inlet of the circulating fluidized bed device for desulfurization treatment.
Preferably, the flue gas conveying pipeline is provided with a first ammonia gas spraying device. In the first ammonia gas spraying device, the original flue gas and the ammonia gas are mixed and then conveyed to a flue gas inlet of the circulating fluidized bed device for desulfurization treatment.
Preferably, the second ammonia gas injection device is arranged on the second conveying pipeline. And in the second ammonia gas injection device, mixing the gas subjected to dust removal by the bag-type dust remover and secondary desulfurization with ammonia gas, and conveying the mixture to an activated carbon adsorption tower for denitration treatment.
Preferably, the flue gas cooling system is used for cooling the raw flue gas by directly adding cold air into the raw flue gas or indirectly exchanging heat of the raw flue gas through the flue gas cooling system.
Preferably, the temperature of the flue gas which is cooled by the flue gas cooling system and then conveyed to the circulating fluidized bed device is 160 ℃, preferably 105 ℃ to 150 ℃, and more preferably 110 ℃ to 140 ℃.
In the invention, the activated carbon powder injection device and/or the acid-making wastewater injection device arranged at the bottom of the circulating fluidized bed device comprise at least one activated carbon powder spray head and/or acid-making wastewater spray head, and a plurality of or a plurality of groups of activated carbon powder spray heads and/or acid-making wastewater spray heads can be arranged according to actual production requirements (such as different pollutant contents of raw flue gas or different specifications of the circulating fluidized bed).
In the technical scheme of the invention, activated carbon dust or powder generated by an activated carbon adsorption system and an activated carbon desorption system is fully utilized, a scheme of combining a circulating fluidized bed device and a bag-type dust remover is adopted, the activated carbon powder is conveyed to the circulating fluidized bed device, and the circulating fluidized bed device and the bag-type dust remover are utilized to carry out desulfurization treatment on the raw flue gas. Meanwhile, ammonia gas is sprayed at the position where the flue gas enters the circulating fluidized bed device. In the production, ammonia gas is sprayed into the flue gas, the ammonia gas and most of sulfides in the flue gas can form ammonium sulfate or ammonium sulfite crystals at a certain temperature, and the part of crystals is mixed with activated carbon powder and then is easily collected by a bag-type dust collector; meanwhile, the activated carbon powder can adsorb the residual sulfide in the smoke. The activated carbon powder is adhered to the cloth bag to form an activated carbon layer with a certain thickness, and the activated carbon layer has a good adsorption effect on pollutants in the smoke.
After the flue gas is introduced, the temperature of the flue gas is firstly reduced to about 100-160 ℃ by a flue gas cooling system, and the cooled flue gas enters a circulating fluidized bed device. The bottom of the circulating fluidized bed device is provided with an activated carbon powder spraying device, activated carbon powder and activated carbon powder stored by the conveying system can be sprayed out of the device, so that the activated carbon powder is fully contacted with flue gas, and pollutants in the flue gas are adsorbed by the activated carbon powder.
The flue gas is provided with an ammonia gas injection device before entering the circulating fluidized bed device, and ammonia gas and most of sulfides in the flue gas form ammonium sulfate or ammonium sulfite crystals after being uniformly mixed, and then enter the circulating fluidized bed device for further full mixing and adsorption. The flue gas then enters a bag-type dust collector. The bag-type dust collector is mainly used for collecting activated carbon dust and other dust in flue gas, and simultaneously, the activated carbon dust is adhered to a bag to form an activated carbon layer with a certain thickness, so that ammonium sulfate or ammonium sulfite crystals formed before can be collected, and meanwhile, the activated carbon layer has a good adsorption effect on other pollutants in the flue gas. The activated carbon dust and the mixture thereof collected by the bag-type dust collector can be sent to a regeneration device for regeneration, and the adsorbed sulfide can be released and sent to an acid making system for acid making.
In the invention, the dust collecting system is respectively connected with the inlet and the outlet of the activated carbon adsorption tower and the inlet and the outlet of the activated carbon desorption tower through pipelines, which means that suction ports of a dust collector for absorbing activated carbon powder of the dust collecting system are respectively arranged between the outlet of the activated carbon adsorption tower and the inlet of the first activated carbon conveying device, between the inlet of the activated carbon adsorption tower and the outlet of the second activated carbon conveying device, between the inlet of the activated carbon desorption tower and the outlet of the first activated carbon conveying device, and between the outlet of the activated carbon desorption tower and the inlet of the second activated carbon conveying device and/or the inlet of the activated carbon vibrating screen; and under the action of an activated carbon dust removal fan, activated carbon powder generated in the conveying process of the activated carbon is collected into a second bag-type dust remover in a dust collection system, and then the collected activated carbon powder is conveyed into an activated carbon powder storage and conveying system through a dust conveying pipe to be recycled.
According to the invention, by additionally arranging the dust collection system and the dust collector, powder generated by adopting activated carbon in all systems for treating flue gas by activated carbon can be collected, and activated carbon powder resources are fully utilized for subsequent flue gas desulfurization treatment; meanwhile, dust pollutants are reduced, the technical characteristics change waste into valuable, resources are fully utilized, and environmental pollution is reduced. The activated carbon powder collected by the dust collection system and the dust collector can be just used for the flue gas desulfurization and denitration system provided by the invention, so that subsequent activated carbon treatment and utilization devices are reduced, and the cost is reduced.
The active carbon desorption tower releases the pollutants adsorbed in the active carbon in the process of desorbing and activating the active carbon, and the released pollutants enter the SRG gas. In the prior art, SRG gas is delivered to an acid production system, the acid production system uses active ingredients in the SRG gas, and a large amount of water is needed to flush the SRG gas, so that the acid production system generates a large amount of wastewater, and a wastewater treatment system is needed to be specially equipped to treat the wastewater generated by the acid production system in the prior art. According to the technical scheme, the wastewater generated by the acid making system is conveyed to the circulating fluidized bed device and is sprayed into the circulating fluidized bed device through the acid making wastewater spraying device arranged in the circulating fluidized bed device. After the acid making wastewater is pressurized, the acid making wastewater is sprayed into flue gas from the acid making wastewater spraying device, the wastewater is evaporated by utilizing the high-temperature condition of the flue gas, and ammonia in the wastewater is utilized and used for the desulfurization and denitration process of the original flue gas. Other pollutants in the wastewater are absorbed by the activated carbon powder and then collected by the bag-type dust collector.
The acid making wastewater is conveyed to the circulating fluidized bed device, so that the method has the following effects: 1. the wastewater generated by the acid making system is efficiently treated, so that the investment of a wastewater treatment system specially arranged for treating the wastewater generated by the acid making system is saved; 2. the waste water is evaporated by utilizing the high-temperature environment of the original flue gas, thereby being beneficial to subsequent utilization; meanwhile, the temperature of the original flue gas is reduced by using the waste water, and the processing load of an original flue gas cooling system is reduced; 3. residual ammonia gas in the acid-making wastewater is conveyed to a circulating fluidized bed device, and the ammonia gas is reused, so that the high-efficiency utilization of resources is realized, and the cost is saved; 4. the acid making waste water itself is because the active carbon SOx/NOx control system produces, directly carries to the circulation vulcanization bed device, and make full use of active carbon powder absorbs the pollutant in the waste water, and the rethread sack cleaner is collected, reduces the emission of pollutant, and the waste water and the pollutant that this system produced are handled to the device among the make full use of this system, improve and handle and utilization efficiency.
In the invention, the activated carbon adsorption tower is a cross-flow activated carbon adsorption device or a counter-flow activated carbon adsorption device or any one of the existing activated carbon adsorption devices with the function of purifying flue gas.
In the invention, the first ammonia gas injection device is arranged on the flue gas conveying pipeline and is positioned at the downstream of the flue gas cooling system, the booster fan is arranged on the second conveying pipeline, and the upstream and the downstream of the upstream of the second ammonia gas injection device are judged according to the flow direction of the flue gas, generally, the source direction of the flue gas is considered to be the upstream, and the conveying direction of the flue gas is considered to be the downstream.
In the invention, the booster fan is used for overcoming the system resistance; the flue gas after primary purification by the circulating fluidized bed device and the bag-type dust remover is sent to an active carbon adsorption tower by a booster fan; an ammonia gas spraying device is also arranged between the booster fan and the activated carbon adsorption tower, and the aim is to improve the removal effect of the nitrogen oxides in the flue gas. Most of sulfide in the flue gas is removed in the circulating fluidized bed device and the bag-type dust remover, so that the effect of removing the nitrogen oxide in the flue gas can be greatly improved only by spraying a small amount of ammonia gas. In the activated carbon adsorption tower, nitrogen oxides are reduced under the catalytic action of ammonia gas and activated carbon, residual pollutants (such as dust, dioxin, heavy metals, a small amount of sulfides and the like) in the flue gas are removed, and the flue gas is purified and then discharged to the atmosphere through a chimney.
In the invention, to remove the nitrogen oxides in the flue gas, a certain amount of ammonia gas is required to be sprayed into the flue gasThe following reaction occurs under the catalysis of activated carbon: NOx+NH3+1/2O*→N2+3/2H2O; the nitrogen oxides are reduced to harmless nitrogen and water. However, if there are sulfides in the flue gas, the injected ammonia gas will react preferentially with the sulfides in the flue gas to produce ammonium sulfate or ammonium sulfite crystals, which affects the efficiency of removing nitrogen oxides, so that most of the sulfides in the flue gas need to be removed in one step.
In the invention, the circulating fluidized bed device and the bag-type dust collector are utilized to remove sulfides in the flue gas, and a group of activated carbon adsorption towers are used to remove nitrogen oxides in the flue gas, so that the purified flue gas meets the national ultra-low emission requirement. If the sulfide in the flue gas is removed firstly without a circulating fluidized bed device and a bag-type dust collector, the purified flue gas can meet the national ultra-low emission requirement, at least two groups of activated carbon adsorption towers are generally needed to meet the standard emission requirement, and the investment and operation cost is greatly increased.
In the invention, the activated carbon absorbed with pollutants is discharged from the bottom of the activated carbon adsorption tower and is sent to the activated carbon desorption tower through the first activated carbon conveying device; the function of the desorption tower is to recover the activity of the activated carbon and release or decompose harmful substances. SO in a stripper2Is released by high-temperature analysis, and the dioxin destroys the oxygen radical between benzene rings under the action of a catalyst in the activated carbon, so that the benzene rings are subjected to structural transformation and cracking to form harmless substances. The analyzed active carbon is screened by an active carbon vibrating screen at the bottom end of the analyzing tower, large-particle active carbon falls into a second active carbon conveying device and is conveyed to an active carbon adsorption tower for cyclic utilization, and small-particle active carbon powder is conveyed into an active carbon powder bin. Activated carbon dust is generated in the conveying process, and the second bag-type dust collector and the activated carbon dust removal fan are arranged to collect and convey the generated activated carbon dust to the activated carbon powder storage and conveying system for reuse. In the traditional activated carbon flue gas purification process, activated dust collected by the activated carbon powder bin and the second bag-type dust collector is generally sent to a factory to be used as fuel, and the utilization value is low. In the process of the invention, the collected activated carbon powder is sent to the activated carbon powder and a conveying system and is sprayed into the circulation as a desulfurizing agentThe vulcanizing bed device can be repeatedly used, and the utilization value of the vulcanizing bed device is improved.
According to the invention, by reasonably arranging the circulating fluidized bed device and arranging the activated carbon powder spraying device and/or the acid making waste book spraying device in the circulating fluidized bed device, most sulfides in the flue gas can be removed in one step, and then the flue gas enters the bag-type dust remover to collect and separate various dusts, so that the raw flue gas is further purified, the pressure of a subsequent activated carbon adsorption tower is reduced, the subsequent flue gas purification effect is enhanced, and then only less ammonia gas needs to be sprayed, so that the nitrogen oxides in the raw flue gas can be removed to a great extent, and the flue gas treatment cost is reduced.
In the present invention, the height of the activated carbon adsorption column is 20 to 120m, preferably 30 to 100m, more preferably 40 to 80m, and further preferably 50 to 60 m.
In the present invention, the height of the activated carbon desorption column is 15 to 100m, preferably 20 to 80m, more preferably 30 to 70m, and still more preferably 40 to 60 m.
In the present invention, the height of the circulating fluidized bed apparatus is 20 to 180m, preferably 30 to 150m, more preferably 40 to 120m, further preferably 50 to 80 m.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention fully utilizes the activated carbon dust or powder generated by the activated carbon adsorption system and the activated carbon desorption system, adopts the scheme of combining the circulating fluidized bed device and the bag-type dust remover, conveys the activated carbon powder to the circulating fluidized bed device, and utilizes the circulating fluidized bed device and the bag-type dust remover to carry out desulfurization treatment on the raw flue gas.
2. According to the invention, by additionally arranging the dust collection system and the dust collector, powder generated by adopting activated carbon in all systems for treating flue gas by activated carbon can be collected, and activated carbon powder resources are fully utilized for subsequent flue gas desulfurization treatment; meanwhile, dust pollutants are reduced, the technical characteristic changes waste into valuable,
3. according to the technical scheme, the waste water generated by the acid making system is conveyed to the circulating fluidized bed device, and is sprayed into the circulating fluidized bed device through the acid making waste water spraying device arranged in the circulating fluidized bed device, so that residual ammonia gas and activated carbon powder in the acid making waste water are fully utilized.
4. In the traditional activated carbon flue gas purification process, after ammonia gas is sprayed into flue gas, the flue gas and sulfide form ammonium sulfate or ammonium sulfite crystals, and the ammonium sulfate or ammonium sulfite crystals directly enter an activated carbon adsorption tower to be adsorbed by activated carbon. Due to the fact that the ammonium sulfite is high in viscosity, the ammonium sulfite is easily blocked and hardened when being mixed with the activated carbon, blanking is not smooth, the activated carbon is further heated, and fire risks are caused. According to the scheme, the cloth bag dust remover is used for collecting ammonium sulfate or ammonium sulfite in the flue gas, so that the ammonium sulfate or ammonium sulfite entering the flue gas of the activated carbon adsorption tower is greatly reduced.
Drawings
FIG. 1 is a structural diagram of a desulfurization and denitrification system for activated carbon according to the present invention;
FIG. 2 is a structural diagram of an activated carbon desulfurization and denitrification system with a dust collection system according to the present invention;
FIG. 3 is a structural diagram of an activated carbon desulfurization and denitrification system with an SRG gas acid production system according to the present invention;
FIG. 4 is a structural diagram of an activated carbon desulfurization and denitrification system with an ammonia gas injection device according to the present invention.
Reference numerals: 1: an activated carbon powder storage and delivery system; 2: a circulating fluidized bed device; 3: a bag-type dust collector; 4: an activated carbon adsorption tower; 5: an activated carbon desorption tower; 6: a first activated carbon delivery device; 7: a second activated carbon delivery device; 8: an active carbon vibrating screen; 9: an activated carbon powder bin; 10: a dust collection system; 11: a dust removal fan; 12: a booster fan; 13 a flue gas cooling system; 14: activated carbon powder spraying device; 15: acid-making wastewater is sprayed into the device; 16: a first ammonia gas injection device; 17: a second ammonia gas injection device; 18: raw flue gas; 19: a flue gas outlet; 20: a flue gas inlet; 21: an acid making system; 22: a second bag-type dust collector; l0: a flue gas conveying pipeline; l1: a first delivery conduit; l2: a second delivery conduit; l3: a wastewater delivery pipeline; l4 gas delivery line; l5: a dust conveying pipe; l6: a dust conveying pipe; 101: a dust collector; 401: and an SRG gas outlet.
Detailed Description
A comprehensive-utilization activated carbon desulfurization and denitrification system comprises: the device comprises an active carbon powder storage and conveying system 1, a circulating fluidized bed device 2, a bag-type dust collector 3, an active carbon adsorption tower 4, an active carbon desorption tower 5, an active carbon vibrating screen 8 and an active carbon powder bin 9. Wherein: the active carbon discharge port of the active carbon adsorption tower 4 is connected with the active carbon feed port of the active carbon desorption tower 5 through a first active carbon conveying device 6. The active carbon discharge port of the active carbon desorption tower 5 is connected with the active carbon feed port of the active carbon adsorption tower 4 through a second active carbon conveying device 7. An active carbon vibrating screen 8 is arranged between the active carbon discharge port of the active carbon desorption tower 5 and the second active carbon conveying device 7. The active carbon vibrating screen 8 is connected with an active carbon powder bin 9, and the active carbon powder bin 9 is connected to the active carbon powder storage and conveying system 1. The bottom of the circulating fluidized bed device 2 is provided with an activated carbon powder spraying device 14 and a flue gas inlet 20, and the activated carbon powder storage and conveying system 1 is connected with the activated carbon powder spraying device 14. A flue gas duct L0 is connected to the flue gas inlet 20. The exhaust port of the circulating fluidized bed device 2 is connected to the inlet port of the bag-type dust collector 3 through a first delivery pipe L1. The air outlet of the bag-type dust collector 3 is connected to the air inlet of the activated carbon adsorption tower 4 through a second conveying pipeline L2.
Preferably, the system further includes a dust collection system 10. The first active carbon conveying device 6 is provided with a dust collector 101 above the position of the active carbon discharge port of the active carbon adsorption tower 4. The first active carbon conveying device 6 is provided with a dust collector 101 above the active carbon feeding hole of the active carbon desorption tower 5. The second active carbon conveying device 7 is provided with a dust collector 101 above the active carbon feed inlet of the active carbon adsorption tower 4, and the dust collector 101 is arranged above the active carbon vibrating screen 8. The dust collector 101 is connected to the inlet of the dust collection system 10. The discharge port of the dust collection system 10 is connected to the activated carbon powder storage and conveyance system 1 through a dust conveyance pipe L6.
Preferably, the activated carbon desorption column 5 is provided with an SRG gas outlet 401. SRG gas outlet 401 is connected to acid making system 21 by SRG gas delivery line L4. The bottom of the circulating fluidized bed device 2 is also provided with an acid-making wastewater spraying device 15. An acid making wastewater outlet of the acid making system 21 is communicated to the acid making wastewater spraying device 15 through a wastewater conveying pipeline L3.
Preferably, the system further comprises a flue gas cooling system 13. The flue gas cooling system 13 is arranged on the flue gas conveying pipeline L0.
Preferably, the system further comprises a first ammonia gas injection means 16. The first ammonia gas injection device 16 is arranged on the flue gas conveying pipeline L0 and is positioned at the downstream of the flue gas cooling system 13.
Preferably, the system further comprises a second ammonia gas injection device 17. The second ammonia gas injection device 17 is provided on the second delivery pipe L2.
Preferably, the system further comprises a booster fan 12. The booster fan 12 is provided on the second delivery pipe L2, and is located upstream of the second ammonia gas injection device 17.
Preferably, the dust collection system 10 includes a second bag-type dust collector 22 and a dust removal fan 11. The dust removing fan 11 is connected with the second bag-type dust remover 22. The dust collector 101 is connected to the inlet of the second bag-type dust collector 22. The discharge port of the second bag-type dust collector 22 is connected to the activated carbon powder storage and delivery system 1 through a dust delivery pipe L6.
The technical solution of the present invention is illustrated below, and the claimed scope of the present invention includes, but is not limited to, the following examples.
Example 1
As shown in fig. 1, a comprehensive utilization activated carbon desulfurization and denitrification system comprises: the device comprises an active carbon powder storage and conveying system 1, a circulating fluidized bed device 2, a bag-type dust collector 3, an active carbon adsorption tower 4, an active carbon desorption tower 5, an active carbon vibrating screen 8 and an active carbon powder bin 9. Wherein: the active carbon discharge port of the active carbon adsorption tower 4 is connected with the active carbon feed port of the active carbon desorption tower 5 through a first active carbon conveying device 6. An active carbon discharge port of the active carbon desorption tower 5 is connected with an active carbon feed port of the active carbon adsorption tower 4 through a second active carbon conveying device 7; an active carbon vibrating screen 8 is arranged between the active carbon discharge port of the active carbon desorption tower 5 and the second active carbon conveying device 7. The active carbon vibrating screen 8 is connected with an active carbon powder bin 9, and the active carbon powder bin 9 is connected to the active carbon powder storage and conveying system 1. The bottom of the circulating fluidized bed device 2 is provided with an activated carbon powder spraying device 14 and a flue gas inlet 20, and the activated carbon powder storage and conveying system 1 is connected with the activated carbon powder spraying device 14. A flue gas duct L0 is connected to the flue gas inlet 20. The exhaust port of the circulating fluidized bed device 2 is connected to the air inlet of the bag-type dust collector 3 through a first conveying pipeline L1; the air outlet of the bag-type dust collector 3 is connected to the air inlet of the activated carbon adsorption tower 4 through a second conveying pipeline L2.
Example 2
Example 1 is repeated, as shown in fig. 2, the system further comprising a dust collection system 10. The dust collector 101 is arranged above the position of the active carbon discharge port of the active carbon adsorption tower 4 of the first active carbon conveying device 6, the dust collector 101 is arranged above the position of the active carbon feed port of the active carbon desorption tower 5 of the first active carbon conveying device 6, the dust collector 101 is arranged above the position of the active carbon feed port of the active carbon adsorption tower 4 of the second active carbon conveying device 7, and the dust collector 101 are arranged above the active carbon vibrating screen 8.
The dust collector 101 is connected to the inlet of the dust collection system 10, and the outlet of the dust collection system 10 is connected to the activated carbon powder storage and transportation system 1 through the dust transportation pipe L6.
Example 3
Example 2 was repeated, and the dust-collecting system 10 included the second bag-type dust collector 22 and the dust-removing fan 11. The dust removing fan 11 is connected with the second bag-type dust remover 22. The dust collector 101 is connected to the inlet of the second bag-type dust collector 22, and the outlet of the second bag-type dust collector 2 is connected to the activated carbon powder storage and delivery system 1 through a dust delivery pipe L6.
Example 4
Example 3 is repeated, as shown in fig. 3, the activated carbon desorption tower 5 is provided with an SRG gas outlet 401, and the SRG gas outlet 401 is connected to the acid making system 21 through an SRG gas conveying pipeline L4.
The bottom of the circulating fluidized bed device 2 is also provided with an acid making wastewater spraying device 15, and an acid making wastewater outlet of the acid making system 21 is communicated to the acid making wastewater spraying device 15 through a wastewater conveying pipeline L3.
Example 5
Example 4 was repeated, and as shown in fig. 4, the system further included a first ammonia gas injection device 16. The first ammonia gas injection device 16 is arranged on the flue gas conveying pipeline L0 and is positioned at the downstream of the flue gas cooling system 13.
Example 6
Example 5 was repeated, and as shown in FIG. 4, the system further included a second ammonia gas injection device 17. The second ammonia gas injection device 17 is provided on the second delivery pipe L2.
Example 7
Example 6 is repeated, as shown in fig. 4, the system further comprising a booster fan. The booster fan is arranged on the second conveying pipeline and is positioned at the upstream of the second ammonia gas injection device.
Example 8
In embodiment 7, as shown in fig. 3 or 4, the system further includes a flue gas cooling system 13, the flue gas cooling system 13 is disposed on the flue gas conveying pipeline L0, and the raw flue gas is cooled by the flue gas cooling system 13 and then conveyed to the flue gas inlet 20 of the circulating fluidized bed device 2 for desulfurization.
The temperature of the flue gas which is cooled by the flue gas cooling system 13 and then conveyed to the circulating fluidized bed device 2 is 110 ℃.
Example 9
Example 8 was repeated except that the temperature of the flue gas delivered to the circulating fluidized bed apparatus 2 after being cooled by the flue gas cooling system 13 was 130 ℃.
Example 10
Example 8 is repeated, except that the upper part of the activated carbon adsorption tower 4 is also provided with a flue gas outlet 19, and the flue gas outlet 19 is connected with a chimney.
Example 11
The method for treating flue gas by using the activated carbon desulfurization and denitrification system in the embodiment 1 comprises the following steps:
1) the original flue gas 18 is conveyed to a flue gas inlet 20 of the circulating fluidized bed device 2 through a flue gas conveying pipeline L0 for desulfurization treatment, and the flue gas after desulfurization treatment is conveyed to a bag-type dust remover 3 through a first conveying pipeline L1 for dust removal and secondary desulfurization; the flue gas subjected to dust removal by the bag-type dust remover 3 and secondary desulfurization is conveyed to the activated carbon adsorption tower 4 through a second conveying pipeline L2 for denitration treatment, and the flue gas subjected to denitration treatment by the activated carbon adsorption tower 4 is clean flue gas;
2) after being resolved and activated by the activated carbon resolving tower 5, the activated carbon is conveyed to the activated carbon adsorption tower 4 through the second activated carbon conveying device 7, the activated carbon adsorbs pollutants in the activated carbon adsorption tower 4, the activated carbon adsorbing the pollutants is conveyed to the activated carbon resolving tower 5 through the first activated carbon conveying device 6 to be resolved and activated, and the process is circulated;
wherein: the activated carbon analyzed and activated by the activated carbon analyzing tower 5 is screened by the activated carbon vibrating screen 8, the granular activated carbon obtained by screening by the activated carbon vibrating screen 8 is conveyed to the activated carbon adsorption tower 4 through the second activated carbon conveying device 7, the activated carbon powder obtained by screening by the activated carbon vibrating screen 8 enters the activated carbon powder bin 9, the activated carbon in the activated carbon powder bin 9 is conveyed to the activated carbon powder storage and conveying system 1 through the dust conveying pipeline L5, and the activated carbon in the activated carbon powder storage and conveying system 1 is conveyed to the activated carbon powder spraying device 14 at the bottom of the circulating fluidized bed device 2.
Example 12
Example 11 is repeated except that the method further comprises the steps of:
3) a dust collector 101 in the dust collection system 10 collects activated carbon dust of which the first activated carbon conveying device 6 is positioned above the position of an activated carbon discharge port of the activated carbon adsorption tower 4, the first activated carbon conveying device 6 is positioned above the position of an activated carbon feed port of the activated carbon desorption tower 5, the second activated carbon conveying device 7 is positioned above the position of the activated carbon feed port of the activated carbon adsorption tower 4 and above the activated carbon vibrating screen 8; the dust collected by the dust collection system 10 is transported to the activated carbon powder storage and transport system 1 through the dust transport duct L6.
Example 13
Example 12 is repeated except that the method further comprises the steps of: 4) SRG gas generated by the activated carbon desorption tower 5 is connected to the acid making system 21 through an SRG gas conveying pipeline L4, acid making wastewater generated by the acid making system 21 is communicated to the acid making wastewater injection device 15 of the circulating fluidized bed device 2 through a wastewater conveying pipeline L3, and the acid making wastewater and activated carbon powder carry out desulfurization treatment on raw flue gas in the circulating fluidized bed device 2 and the bag-type dust collector 3.
Example 14
Example 13 was repeated except that the flue gas duct L0 was provided with a first ammonia gas injection means 16. In the first ammonia gas injection device 16, the raw flue gas and the ammonia gas are mixed and then conveyed to a flue gas inlet 20 of the circulating fluidized bed device 2 for desulfurization treatment. The second ammonia gas injection device 17 is provided on the second delivery pipe L2. In the second ammonia gas injection device 17, the gas subjected to dust removal by the bag-type dust remover 3 and secondary desulfurization is mixed with ammonia gas and then is conveyed to the activated carbon adsorption tower 4 for denitration treatment.
Example 15
The embodiment 14 is repeated, except that the flue gas conveying pipeline L0 is provided with the flue gas cooling system 13. The original flue gas is cooled by the flue gas cooling system 13 and then conveyed to the flue gas inlet 20 of the circulating fluidized bed device 2 for desulfurization treatment. The flue gas cooling system 13 is used for cooling the raw flue gas by directly adding cold air into the raw flue gas, and the temperature of the flue gas which is cooled by the flue gas cooling system 13 and then conveyed to the circulating fluidized bed device 2 is 110 ℃.
Comparative example
The traditional process is adopted, two stages of activated carbon adsorption towers are adopted for treating the flue gas, and ammonia gas is sprayed at flue gas inlets of the two stages of activated carbon adsorption towers.
At 600m2For example, in the flue gas purification process of a sintering machine, in order to meet the national ultra-low emission requirement, a two-stage active carbon adsorption tower adsorption process is adopted, and in the process, a circulating fluidized bed device and a bag-type dust collector are used for replacing one stage of active carbon adsorption tower, and the investment contrast is as follows:
Figure BDA0002085291450000121
the price of the activated carbon is calculated according to 8000 yuan/ton
Compared with the traditional two-stage active carbon adsorption tower adsorption process, the process has the advantages that:
1. the investment cost of flue gas treatment is saved: the investment savings is 15200+ 4000-8200-11000 ten thousand yuan;
2. saving the investment cost of wastewater treatment: in the invention, the acid-making wastewater can be directly sprayed into the circulating fluidized bed device, so that an acid-making wastewater treatment system can be omitted. At present, the investment of the acid-making wastewater treatment system is about 1500-;
3. the operation cost can be reduced: the process uses the circulating fluidized bed device and the bag-type dust collector to replace a primary activated carbon adsorption tower in the prior art, thereby reducing the abrasion of activated carbon. A plurality of star-shaped ash discharge valves are arranged on the adsorption tower, and the activated carbon can be crushed by the valves when passing through the star-shaped ash discharge valves; meanwhile, the height of the active carbon in the adsorption tower is more than 20 meters, the active carbon at the bottom can be crushed, and the process and the system of the invention reduce the loss of the active carbon;
4. at present, if the CFB process adopted by the existing steel plant desulfurization is changed into an activated carbon purification process, only a primary activated carbon adsorption system needs to be added, the original circulating fluidized bed and the original bag-type dust collector can be continuously utilized, and the reconstruction cost is greatly reduced.

Claims (10)

1. The utility model provides an active carbon SOx/NOx control system who synthesizes and utilize, this active carbon SOx/NOx control system includes: the device comprises an active carbon powder storage and conveying system (1), a circulating fluidized bed device (2), a bag-type dust collector (3), an active carbon adsorption tower (4), an active carbon analysis tower (5), an active carbon vibrating screen (8) and an active carbon powder bin (9); wherein: an active carbon discharge port of the active carbon adsorption tower (4) is connected with an active carbon feed port of the active carbon desorption tower (5) through a first active carbon conveying device (6); an active carbon discharge port of the active carbon desorption tower (5) is connected with an active carbon feed port of the active carbon adsorption tower (4) through a second active carbon conveying device (7); an active carbon vibrating screen (8) is arranged between an active carbon discharge port of the active carbon desorption tower (5) and the second active carbon conveying device (7); the active carbon vibrating screen (8) is connected with an active carbon powder bin (9), and the active carbon powder bin (9) is connected with an active carbon powder storage and conveying system (1); the bottom of the circulating fluidized bed device (2) is provided with an activated carbon powder spraying device (14) and a flue gas inlet (20), and the activated carbon powder storage and conveying system (1) is connected with the activated carbon powder spraying device (14); a flue gas conveying pipe (L0) is connected to the flue gas inlet (20); the exhaust port of the circulating fluidized bed device (2) is connected to the air inlet of the bag-type dust collector (3) through a first conveying pipeline (L1); the air outlet of the bag-type dust collector (3) is connected to the air inlet of the activated carbon adsorption tower (4) through a second conveying pipeline (L2).
2. The activated carbon desulfurization and denitrification system according to claim 1, wherein: the system further comprises a dust collection system (10); a dust collector (101) is arranged above the position of an active carbon discharge port of the active carbon adsorption tower (4) of the first active carbon conveying device (6), the dust collector (101) is arranged above the position of an active carbon feed inlet of the active carbon desorption tower (5) of the first active carbon conveying device (6), the dust collector (101) is arranged above the position of an active carbon feed inlet of the active carbon adsorption tower (4) of the second active carbon conveying device (7), and the dust collector (101) is arranged above the active carbon vibrating screen (8); the dust collector (101) is connected to the feed inlet of the dust collection system (10), and the discharge outlet of the dust collection system (10) is connected to the activated carbon powder storage and conveying system (1) through a dust conveying pipe (L6).
3. The activated carbon desulfurization and denitrification system according to claim 1 or 2, characterized in that: an SRG gas outlet (401) is arranged on the active carbon desorption tower (5), and the SRG gas outlet (401) is connected to the acid making system (21) through an SRG gas conveying pipeline (L4); the bottom of the circulating fluidized bed device (2) is also provided with an acid making wastewater spraying device (15), and an acid making wastewater outlet of the acid making system (21) is communicated to the acid making wastewater spraying device (15) through a wastewater conveying pipeline (L3); and/or
The system also comprises a flue gas cooling system (13); the flue gas cooling system (13) is arranged on the flue gas conveying pipeline (L0).
4. The activated carbon desulfurization and denitrification system according to claim 3, wherein: the system also comprises a first ammonia gas injection device (16); the first ammonia gas injection device (16) is arranged on the flue gas conveying pipeline (L0) and is positioned at the downstream of the flue gas cooling system (13); and/or
The system further comprises a second ammonia gas injection device (17); the second ammonia gas injection device (17) is arranged on the second conveying pipeline (L2).
5. The activated carbon desulfurization and denitrification system according to claim 4, wherein: the system further comprises a booster fan (12); the booster fan (12) is arranged on the second conveying pipeline (L2) and is positioned at the upstream of the second ammonia gas injection device (17); and/or
The dust collecting system (10) comprises a second bag-type dust collector (22) and a dust removing fan (11), and the dust removing fan (11) is connected with the second bag-type dust collector (22); the dust collector (101) is connected to the feeding hole of the second bag-type dust collector (22), and the discharging hole of the second bag-type dust collector (22) is connected to the activated carbon powder storage and conveying system (1) through a dust conveying pipe (L6).
6. A method for desulfurization and denitrification by integrated utilization of activated carbon or a method for treating flue gas by using the activated carbon desulfurization and denitrification system as set forth in any one of claims 1-5, which comprises the steps of:
1) the method comprises the following steps that original flue gas (18) is conveyed to a flue gas inlet (20) of a circulating fluidized bed device (2) through a flue gas conveying pipeline (L0) for desulfurization treatment, and the flue gas after desulfurization treatment is conveyed to a bag-type dust remover (3) through a first conveying pipeline (L1) for dust removal and secondary desulfurization; the flue gas subjected to dust removal and secondary desulfurization by the bag-type dust remover (3) is conveyed to the activated carbon adsorption tower (4) through a second conveying pipeline (L2) for denitration treatment, and the flue gas subjected to denitration treatment by the activated carbon adsorption tower (4) is clean flue gas;
2) the activated carbon is analyzed and activated by the activated carbon analyzing tower (5) and then is conveyed to the activated carbon adsorption tower (4) through the second activated carbon conveying device (7), the activated carbon adsorbs pollutants in the activated carbon adsorption tower (4), the activated carbon adsorbing the pollutants is conveyed to the activated carbon analyzing tower (5) through the first activated carbon conveying device (6) to be analyzed and activated, and the process is circulated;
the method is characterized in that: the activated carbon analyzed and activated by the activated carbon analyzing tower (5) is screened by the activated carbon vibrating screen (8), the granular activated carbon obtained by screening by the activated carbon vibrating screen (8) is conveyed to the activated carbon adsorption tower (4) through the second activated carbon conveying device (7), the activated carbon powder obtained by screening by the activated carbon vibrating screen (8) enters the activated carbon powder bin (9), the activated carbon in the activated carbon powder bin (9) is conveyed to the activated carbon powder storage and conveying system (1) through the dust conveying pipeline (L5), and the activated carbon in the activated carbon powder storage and conveying system (1) is conveyed to the activated carbon powder spraying device (14) at the bottom of the circulating fluidized bed device (2).
7. The method of claim 6, wherein: the method further comprises the steps of:
3) a dust collector (101) in the dust collection system (10) collects activated carbon dust of which a first activated carbon conveying device (6) is positioned above an activated carbon discharge port of an activated carbon adsorption tower (4), the first activated carbon conveying device (6) is positioned above an activated carbon feed port of an activated carbon desorption tower (5), a second activated carbon conveying device (7) is positioned above the activated carbon feed port of the activated carbon adsorption tower (4) and above an activated carbon vibrating screen (8); the dust collected by the dust collecting system (10) is conveyed to the activated carbon powder storage and conveying system (1) through a dust conveying pipeline (L6).
8. The method according to claim 6 or 7, characterized in that: the method further comprises the steps of:
4) SRG gas generated by the activated carbon desorption tower (5) is connected to an acid making system (21) through an SRG gas conveying pipeline (L4), acid making wastewater generated by the acid making system (21) is communicated to an acid making wastewater spraying device (15) of the circulating fluidized bed device (2) through a wastewater conveying pipeline (L3), and the acid making wastewater and activated carbon powder are used for carrying out desulfurization treatment on raw flue gas in the circulating fluidized bed device (2) and the bag-type dust collector (3); and/or
A flue gas cooling system (13) is arranged on the flue gas conveying pipeline (L0), and the raw flue gas is cooled by the flue gas cooling system (13) and then conveyed to a flue gas inlet (20) of the circulating fluidized bed device (2) for desulfurization treatment.
9. The method according to any one of claims 6-8, wherein: a first ammonia gas injection device (16) is arranged on the flue gas conveying pipeline (L0); in the first ammonia gas injection device (16), mixing the original flue gas and ammonia gas, and conveying the mixture to a flue gas inlet (20) of the circulating fluidized bed device (2) for desulfurization treatment; and/or
A second ammonia gas injection device (17) is arranged on the second conveying pipeline (L2); in the second ammonia gas injection device (17), the gas subjected to dust removal and secondary desulfurization by the bag-type dust remover (3) is mixed with ammonia gas and then conveyed to the activated carbon adsorption tower (4) for denitration treatment.
10. The method according to any one of claims 6-9, wherein: the flue gas cooling system (13) is used for cooling the raw flue gas by directly adding cold air into the raw flue gas or indirectly exchanging heat of the raw flue gas through the flue gas cooling system (13); and/or
The temperature of the flue gas which is cooled by the flue gas cooling system (13) and then is conveyed to the circulating fluidized bed device (2) is 160 ℃ below zero, preferably 150 ℃ below zero and more preferably 140 ℃ below zero.
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EP0515696A1 (en) * 1990-12-17 1992-12-02 Mitsui Mining Company, Limited Process for producing formed active coke for desulfurization and denitrification with high denitrification performance
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