CN212262910U - Ultra-clean discharge system for desulfurization, denitrification and waste heat recovery of coke oven flue gas - Google Patents
Ultra-clean discharge system for desulfurization, denitrification and waste heat recovery of coke oven flue gas Download PDFInfo
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- CN212262910U CN212262910U CN202020901941.3U CN202020901941U CN212262910U CN 212262910 U CN212262910 U CN 212262910U CN 202020901941 U CN202020901941 U CN 202020901941U CN 212262910 U CN212262910 U CN 212262910U
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Abstract
The utility model provides a coke oven flue gas desulfurization denitration and waste heat recovery utilize's ultra-clean discharge system, the system includes: the device comprises a waste heat utilization device, a desulfurization reaction device, a dust removal device, an ammonia spraying device and a denitration reaction device; the waste heat utilization device is connected with the desulfurization reaction device through a pipeline to obtain cooling coke oven flue gas, and the cooling coke oven flue gas enters the desulfurization reaction device; an inlet of the dust removal device is connected with an outlet of the desulfurization reaction device through a pipeline to obtain dedusted gas; the inlet of the ammonia spraying device is connected with the outlet of the dust removal device through a pipeline, the outlet of the ammonia spraying device is connected with the inlet of the denitration reaction device through a pipeline, and the dedusted gas enters the ammonia spraying device for denitration treatment. The system can effectively remove the coke oven smoke pollutants, realize ultralow emission, and has the desulfurization efficiency of more than 99 percent and the denitration efficiency of more than 90 percent; the waste of heat resources is reduced, and the investment and the operation cost are reduced.
Description
Technical Field
The utility model belongs to the technical field of coke oven flue gas desulfurization denitration, concretely relates to coke oven flue gas desulfurization denitration and waste heat recovery utilize's ultra-clean discharge system.
Background
With the continuous development and progress of modern economic society, the coke oven flue gas desulfurization and denitrification work of coke plants is receiving attention from more and more environmental protection departments and experts and scholars.
The flue gas discharged in the production process of the coke oven is a main atmospheric pollutant in the coking industry and is also a key field of national atmospheric pollution control. The coke oven flue gas has the following characteristics: the smoke pollutants having complex composition, e.g. SO2、 NOx、H2S, tar, organic matters and the like, and the treatment difficulty is high; the flue gas amount fluctuation is large, and the flue gas amount is greatly fluctuated due to the fact that the flue gas amount is usually required to be reversed in the production process of the coke oven; the temperature of the coke oven smoke is high and the fluctuation is large; the humidity of the smoke is large, and is usually more than 10%.
In order to enable the coke oven smoke emission to meet the increasingly severe environmental protection requirements, various desulfurization and denitrification processes are adopted in the prior art, but desulfurization and denitrification byproducts are generated in the implementation process, pollutants are increased, and the use requirements cannot be met.
The combination of SDS desulfurization (sodium bicarbonate desulfurization) and active coke denitration solves the dilemma that the byproducts are too many and difficult to treat, can recycle and utilize resources, and provides a reliable process scheme for realizing ultralow emission of the coke oven flue gas.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coke oven flue gas desulfurization denitration and waste heat recovery utilize's ultra-clean discharge system to solve present coke oven flue gas desulfurization denitration in-process at least and produce the accessory substance, the pollutant increases, and the processing degree of difficulty is big, can't accomplish the problem of ultra-clean emission.
In order to achieve the above object, the present invention provides the following technical solutions:
an ultra-clean discharge system for desulfurization, denitrification and waste heat recovery of coke oven flue gas, comprising: the device comprises a waste heat utilization device, a desulfurization reaction device, a dust removal device, an ammonia spraying device and a denitration reaction device;
the waste heat utilization device is connected with the desulfurization reaction device through a pipeline, the waste heat utilization device absorbs heat to obtain cooling coke oven flue gas, the cooling coke oven flue gas enters the desulfurization reaction device, and the desulfurization reaction device is used for desulfurization treatment;
the inlet of the dust removal device is connected with the outlet of the desulfurization reaction device through a pipeline, and the dust removal device is used for removing dust and purifying the flue gas after desulfurization reaction to obtain the gas after dust removal;
an inlet of the ammonia spraying device is connected with an outlet of the dust removal device through a pipeline, an outlet of the ammonia spraying device is connected with an inlet of the denitration reaction device through a pipeline, the dedusted gas enters the ammonia spraying device, and enters the denitration reaction device together with ammonia water sprayed by the ammonia spraying device, denitration treatment is carried out under the action of a catalyst in the denitration reaction device, and flue gas is further purified;
and a thermal desorption system is arranged on a pipeline between the dust removal device and the ammonia injection device, and is used for heating the gas after dust removal so as to improve the activity of the catalyst after denitration.
In the ultra-clean discharge system as described above, preferably, the thermal desorption system heats the dedusted gas to a temperature of 300 ℃.
In the ultra-clean discharge system, preferably, an ash conveying branch pipe is arranged at the bottom of the dust removal device, one end of the ash conveying branch pipe is connected with an ash hopper at the bottom of the dust removal device, the other end of the ash conveying branch pipe is connected with the desulfurization reaction device, and the solid product in the dust removal device is conveyed to the desulfurization reaction device through the ash conveying branch pipe to further participate in the reaction;
the dust removal device comprises a plurality of ash hoppers, wherein an ash conveying branch pipe is arranged at the bottom of one ash hopper;
and the outlet of the ash bucket is connected with a pneumatic conveying pump, and a reaction product in the ash bucket is conveyed to the desulfurization reaction device through the pneumatic conveying pump.
In the ultra-clean discharge system as described above, preferably, the desulfurization reaction apparatus is an SDS desulfurization reactor; the denitration reactor is an activated carbon denitration reactor, and the activated carbon is uniformly distributed in the denitration reactor; the dust removing device is a bag-type dust remover.
In the ultra-clean discharge system as described above, preferably, the ammonia injection device is an ammonia injection grid.
In the ultra-clean discharge system as described above, preferably, the thermal desorption system comprises an in-line direct-fired furnace.
In the ultra-clean discharge system as described above, preferably, the waste heat utilization device is a waste heat boiler;
in the ultra-clean discharge system, the temperature of the flue gas of the cooling coke oven obtained by the waste heat utilization device is preferably between 145 ℃ and 150 ℃.
In the ultra-clean discharge system, the wind speed of the flue gas entering the dust removal device is preferably 0.78-0.8 m/min.
Compared with the closest prior art, the utility model provides a technical scheme has following excellent effect:
the utility model discloses a combine together SDS desulfurization and active carbon denitration technique, can effectively get rid of coke oven flue gas pollutant, realize the ultralow emission requirement of coke oven flue gas, the utility model discloses a system desulfurization efficiency can be > 99%, and denitration efficiency can be > 90%.
The utility model discloses earlier pass through exhaust-heat boiler recovery heat with high temperature coke oven flue gas for the flue gas temperature reaches SOx/NOx control temperature requirement about 140 ℃, reduces heat resource waste, has reduced follow-up dust collecting equipment's operating temperature simultaneously, has reduced investment cost and running cost.
The flue gas after dust removal further participates in flue gas desulfurization, so that the desulfurization rate of the desulfurizer is improved, the discharge amount of pollutants is reduced, and the later-stage operation cost is reduced.
The activated carbon is used as a denitration catalyst, the reaction temperature is about 140 ℃, the denitration reaction temperature is reduced, the operability is high, the denitration efficiency is high, and meanwhile, the activated carbon can continuously adsorb residual pollutant SO in the flue gas2And the standard of ultralow emission of flue gas is realized. The catalyst active carbon can be used as a catalyst for continuous use after thermal desorption or directly discharged to be used as fuel for recycling, so that the value of resource recycling is realized.
When the catalyst is blocked, the flue gas is heated by using a built-in direct-fired furnace, so that substances adsorbed on the surface of the catalyst are thermally resolved, the loss of heat is reduced, the occupied area is reduced, and the operation cost and the investment cost are reduced.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a flow chart illustrating a structure of an ultra-clean discharge system according to an embodiment of the present invention.
In the figure: 1. a waste heat boiler; 2. an SDS desulfurization reactor; 3. a bag-type dust collector; 31. an ash hopper; 4. A pneumatic conveying pump; 5. ash conveying branch pipes; 6. a built-in direct-fired furnace; 7. an ammonia injection grid; 8. a denitration reactor; 9. and (4) a chimney.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, and may be, for example, either fixed or detachable; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
As shown in figure 1, according to the utility model discloses an embodiment provides a coke oven flue gas desulfurization denitration and waste heat recovery utilize's ultra-clean discharge system, the utility model provides an ultra-clean discharge system adopts waste heat utilization + SDS sodium bicarbonate desulfurization treatment + dust removal treatment + activated carbon denitration treatment's mode to obtain pollutant content few, can directly follow the ultra-clean coke oven flue gas that discharges in the chimney, the utility model discloses the temperature range of the coke oven flue gas that well adopts need satisfy the temperature > 150 ℃.
The utility model discloses an ultra-clean discharge system includes: the device comprises a waste heat utilization device, a desulfurization reaction device, a dust removal device, an ammonia spraying device and a denitration reaction device.
The waste heat utilization device is connected with the desulfurization reaction device through a pipeline, the waste heat utilization device absorbs heat to obtain cooling coke oven flue gas, the cooling coke oven flue gas enters the desulfurization reaction device, and the desulfurization reaction device is used for desulfurization treatment.
The inlet of the dust removal device is connected with the outlet of the desulfurization reaction device through a pipeline, and the dust removal device is used for removing dust and purifying the flue gas after desulfurization reaction to obtain the gas after dust removal.
The entry of spouting the ammonia device passes through the exit linkage of pipeline with dust collector, and the exit of spouting the ammonia device passes through the entry linkage of pipeline with denitration reaction device, and the gas gets into after the dust removal spouts the ammonia device, gets into denitration reaction device jointly with the aqueous ammonia that spouts the ammonia device and spray, carries out denitration treatment under the inside catalyst effect of denitration reaction device, further purifies the flue gas.
In the specific embodiment of the utility model, the waste heat utilization device is a waste heat boiler 1; the desulfurization reaction device is an SDS desulfurization reactor 2, namely the desulfurizer is NaHCO3The powder, preferably the desulfurizing agent fine powder has a particle size satisfying D90 < 20 μm.
The coke oven smoke with the temperature of more than 150 ℃ firstly enters the waste heat boiler 1 for waste heat recovery and utilization to generate steam under different pressure conditions, and the temperature of the coke oven smoke is reduced to the range of 145-150 ℃ after the coke oven smoke passes through the waste heat boiler 1. The cooled coke oven flue gas enters an SDS (sodium dodecyl sulfate) desulfurization reactor 2 for desulfurization, the flue gas enters from an upper distributor of the SDS desulfurization reactor 2, and a desulfurizing agent NaHCO is used3Spraying the fine powder into flue gas at a temperature higher than 140 deg.C, and NaHCO at a temperature higher than 140 deg.C3Decomposition to Na2CO3、H2O and CO2At the moment, the flue gas and the desulfurizer are fully contacted in the SDS desulfurization reactor 2, and the desulfurizer rapidly completes physical and chemical reactions (absorbs SO) in the process2While absorbing HCL and HF), due to newly formed Na2CO3Has high reaction activity at the moment of reaction, and can spontaneously react with acidic pollutants in the flue gas to generate Na2SO4Realization of SO2Absorbing and purifying, and completing the first stage of desulfurization reaction inside the desulfurization reaction device, wherein 80-85% of desulfurization reaction is completed.
In the embodiment of the utility model, the dust collector is a bag-type dust collector 3. Preferably, the bottom of the dust removing device is provided with an ash conveying branch pipe 5One end of the pipe 5 is connected with an ash hopper 31 at the bottom of the dust removal device, the other end of the pipe is connected with the desulfurization reaction device, and the solid product in the dust removal device is conveyed to the desulfurization reaction device through the ash conveying branch pipe 5 to further participate in the reaction; preferably, the dust removing device comprises a plurality of ash hoppers 31, wherein the bottom of one ash hopper 31 is provided with an ash conveying branch pipe 5; still preferably, the outlet of the ash bucket 31 is connected with the pneumatic conveying pump 4, and the reacted product inside the ash bucket 31 is conveyed to the desulfurization reaction device through the pneumatic conveying pump 4. Preferably, the number of the ash hoppers 31 is set according to project conditions, an outlet of each ash hopper 31 is connected with an air conveying pump 4, a product obtained after reaction in one ash hopper 31 is conveyed to the SDS desulfurization reactor 2 through the air conveying pump 4, and products obtained after reaction in the other ash hoppers 31 are output through the air conveying pumps 4 for recycling. The product in the hopper 31 contains a portion of unreacted Na2CO3And Na after reaction2SO4The recycling of the partial solid products in the bag-type dust collector 3 to the SDS desulfurization reactor 2 can improve the utilization rate of the desulfurizer, and the desulfurization efficiency can be reduced if the solid products in the ash bucket 31 are completely recycled to the SDS desulfurization reactor 2, so that only partial solid products are recycled, the utilization rate of the desulfurizer can be improved, and the desulfurization efficiency of the system can not be reduced.
In the specific embodiment of the utility model, the flue gas wind speed entering the interior of the dust removing device is 0.78-0.8m/min (such as 0.782m/min, 0.784m/min, 0.786m/min and 0.788 m/min). The bag-type dust collector 3 has two functions: firstly, collecting precipitated fly ash and reaction product, and secondly, adsorbing SO by pollutant in the second stage2Reaction (Na will be adhered on the surface of the bag-type dust collector 32CO3Internal SO2Will further react with Na2CO3Reaction). Typically 10-20% of the contaminants will react in the dust removal unit and therefore a thick dust bed and low flue gas flow rate (i.e. flue gas velocity of 0.75-0.8m/min) is advantageous for the second stage desulfurization absorption process. After the second stage of desulfurization treatment, the desulfurization efficiency of the system can reach more than 99 percent.
In the embodiment of the utility model, the denitration reactor is an activated carbon denitration reactor 8, and the activated carbon is uniformly distributed in the denitration reactor 8; the activated carbon as the catalyst can reduce the temperature of denitration reaction, the denitration reaction temperature needs to be above 800 ℃ under the condition of no catalyst, the optimal reaction temperature is 850-1100 ℃, the reaction temperature is about 140 ℃ under the catalytic action of the activated carbon, the denitration reaction temperature is reduced, the operability is high, and the denitration efficiency is high.
In the specific embodiment of the utility model, the ammonia spraying device is an ammonia spraying grid 7; the mass concentration of the ammonia water sprayed in the ammonia spraying grid 7 is 15-18%. The flue gas from the bag-type dust collector 3 enters an active carbon denitration reactor 8, the active carbon exists as a low-temperature catalyst, the reaction temperature is about 140 ℃, NOx in the coke oven flue gas is subjected to a reduction reaction under the action of the catalyst and sprayed ammonia water to generate N2And H2And O, cooling the denitrated flue gas, and then discharging the denitrated flue gas into a chimney 9.
Ammonia water is injected into an ammonia injection flow field of the activated carbon denitration reactor 8 through an ammonia injection grid 7 arranged at the upstream of the denitration reactor 8. Through spraying ammonia grid 7, the aqueous ammonia can spray to the flue gas uniformly, and the flue gas stream that contains ammonia carries out denitration reaction through active carbon catalyst bed, sets up and sprays ammonia grid 7 and sprays the aqueous ammonia, and the aqueous ammonia sprays more evenly, and is more abundant with coke oven flue gas contact, can improve denitration efficiency.
In the specific embodiment of the utility model, the pipeline between the dust removing device and the ammonia spraying device is provided with a thermal desorption system, and the thermal desorption system is used for heating the gas after dust removal so as to improve the activity of the catalyst after denitration; preferably, the thermal desorption system heats the dedusted gas to a temperature above 300 ℃. The purpose of thermal desorption system setting in this position is, to the flue gas temperature heating that gets into denitration reactor 8 to analytic temperature, and high temperature flue gas gets into denitration reactor 8, and denitration reactor 8 is inside to heat up to analytic temperature, and the flue gas gets into the upward movement from the entrance below, and the removal in-process active carbon is also resolved, and the material that has resolved gets into chimney 9 along with the flue gas is discharged.
Thermal desorption system is usually when the denitration effect of active carbon descends, opens work, can close thermal desorption system again after desulfurization efficiency improves, can make the utility model discloses a system takes offThe nitre efficiency can reach more than 90 percent. When the concentration of the nitride at the outlet of the chimney 9 does not reach the specified discharge standard for a long time, thermal desorption is carried out on the activated carbon. In the denitration process, factors influencing the activity of the catalyst mainly comprise pollution (or blockage), poisoning, abrasion and the like. The most serious cause of pollution (or blockage) is NH4HSO4。SO2And NH3NH is generated under the state of containing water4HSO3，NH4HSO3Is very easy to be oxidized into NH4HSO4，NH4HSO4The catalyst has low decomposition rate below 280 ℃, is easy to remain and difficult to clean, can be attached to the surface of the catalyst, and can affect the activity and the use of the catalyst after long-time running and accumulation. NH at 300 ℃ or higher4HSO4Will decompose and resolve, and will leave the catalyst surface.
In order to ensure the long-term stable operation of the denitration system, a thermal analysis system is arranged. The thermal desorption system comprises a built-in direct-fired furnace 6. The thermal desorption system heats the catalyst to be above 300 ℃, so that substances on the surface of the catalyst are desorbed and taken away with flue gas, and ammonium bisulfate and the like bonded on the surface of the catalyst are decomposed at high temperature. The built-in direct-fired furnace 6 is characterized in that a burner is directly arranged on a smoke exhaust pipeline. The built-in direct-fired furnace 6 consists of a combustion system, a flue gas system and a control system. The combustion system consists of a combustor, a combustion-supporting air system, a gas system and an ignition system; the combustion-supporting air system adopts air for supporting combustion and directly introduces air into the furnace; the ignition system adopts coke oven gas for ignition; the control system mainly comprises: the control system can adopt local control or remote control and is provided with perfect safety interlock.
The built-in direct-fired furnace 6 has the advantages that the burner is directly arranged on the smoke exhaust pipeline, the heat loss of the furnace body is saved compared with the prior art, and the heat generated after combustion is almost used for raising the temperature of the smoke, so that the consumed energy is less, the equipment investment expenditure is reduced, and the economic effect is very strong. Compared with the traditional heating furnace, the built-in direct-fired furnace 6 has the most remarkable advantages that the consumption of coal gas can be greatly reduced, and the coal gas used for combustion is saved by about 10 to 15 percent compared with the traditional heating furnace; the direct plug-in heating of the burner saves a furnace body, saves the occupied area, the space and the load of the original furnace body, and has short installation time and convenient and simple maintenance.
In order to further understand the utility model discloses a coke oven flue gas desulfurization denitration and waste heat recovery utilize's ultra-clean discharge system, the utility model provides a coke oven flue gas desulfurization denitration and waste heat recovery utilize's ultra-clean discharge method, this method can adopt foretell discharge system to accomplish, mainly includes following step:
the method comprises the following steps of firstly, recycling waste heat of coke oven flue gas through a waste heat boiler 1, cooling the high-temperature coke oven flue gas to 145-plus-150 ℃, performing desulfurization treatment after cooling, performing desulfurization through an SDS desulfurization reactor 2, and enabling the coke oven flue gas after desulfurization to enter a bag-type dust remover 3 for dust removal to obtain dust-removed gas; the reaction solid product in one of the ash hoppers 31 at the bottom of the bag-type dust collector 3 returns to the desulfurization reactor 2 again through the pneumatic conveying pump 4 for secondary reaction, so that the utilization rate of the baking soda is improved, and the products in the other ash hoppers 31 are mainly sodium sulfate and are recycled.
The gas after dust removal enters the activated carbon denitration reaction device after the ammonia spraying treatment of the ammonia spraying grid 7, the denitration treatment of the flue gas is carried out under the action of a catalyst in the denitration reaction device, and the ultra-clean flue gas (meeting the flue gas emission standard) is obtained after the denitration treatment and is discharged from a chimney 9.
Preferably, the gas after dust removal is subjected to ammonia spraying treatment after combustion and heating; preferably, a built-in direct-fired furnace 6 is adopted for combustion heating to heat the flue gas; when the concentration of the nitride at the outlet of the chimney 9 does not reach the specified discharge standard for a long time, thermal analysis is needed to be carried out on the activated carbon, at the moment, a thermal analysis system is started, and after a period of time, the concentration index of the nitride of the discharged flue gas meets the discharge standard and can be closed again, so that the coke oven flue gas can be subjected to denitration reaction at low temperature of about 140 ℃ for most of time, and the consumption of heat resources and the investment and operation cost of equipment are reduced. The thermal desorption time can be set to be 5h, the specific desorption time is determined according to the desorption effect, the higher the temperature is, the better the desorption effect is, and meanwhile, the denitration reaction efficiency is higher, but the thermal desorption can be carried out in a short time of more than 300 ℃ in consideration of the high temperature, the required gas quantity is large, and the operation cost is increased, so that the activity of the catalyst is improved, and the operation cost can be reduced.
To sum up, the utility model discloses a combine together SDS desulfurization and active carbon denitration technique, can effectively get rid of coke oven flue gas pollutant, realize the ultralow emission requirement of coke oven flue gas, the utility model discloses a system desulfurization efficiency can be > 99%, and denitration efficiency can be > 90%.
The utility model discloses earlier pass through exhaust-heat boiler recovery heat with high temperature coke oven flue gas for the flue gas temperature reaches SOx/NOx control temperature requirement about 140 ℃, reduces heat resource waste, has reduced follow-up dust collecting equipment's operating temperature simultaneously, has reduced investment cost and running cost.
The flue gas after dust removal further participates in flue gas desulfurization, so that the desulfurization rate of the desulfurizer is improved, the discharge amount of pollutants is reduced, and the later-stage operation cost is reduced.
The activated carbon is used as a denitration catalyst, the reaction temperature is about 140 ℃, the denitration reaction temperature is reduced, the operability is high, the denitration efficiency is high, and meanwhile, the activated carbon can continuously adsorb residual pollutant SO in the flue gas2And the standard of ultralow emission of flue gas is realized. The catalyst active carbon can be used as a catalyst for continuous use after thermal desorption, or directly discharged to be used as fuel for recycling, so that the value of resource recycling is realized.
When the catalyst is blocked, the flue gas is heated by using a built-in direct-fired furnace, so that substances adsorbed on the surface of the catalyst are thermally resolved, the loss of heat is reduced, the occupied area is reduced, and the operation cost and the investment cost are reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a coke oven flue gas desulfurization denitration and waste heat recovery utilize's ultra-clean discharge system which characterized in that, ultra-clean discharge system includes: the device comprises a waste heat utilization device, a desulfurization reaction device, a dust removal device, an ammonia spraying device and a denitration reaction device;
the waste heat utilization device is connected with the desulfurization reaction device through a pipeline, the waste heat utilization device absorbs heat to obtain cooling coke oven flue gas, the cooling coke oven flue gas enters the desulfurization reaction device, and the desulfurization reaction device is used for desulfurization treatment;
the inlet of the dust removal device is connected with the outlet of the desulfurization reaction device through a pipeline, and the dust removal device is used for removing dust and purifying the flue gas after desulfurization reaction to obtain the gas after dust removal;
an inlet of the ammonia spraying device is connected with an outlet of the dust removal device through a pipeline, an outlet of the ammonia spraying device is connected with an inlet of the denitration reaction device through a pipeline, the dedusted gas enters the ammonia spraying device, and enters the denitration reaction device together with ammonia water sprayed by the ammonia spraying device, denitration treatment is carried out under the action of a catalyst in the denitration reaction device, and flue gas is further purified;
and a thermal desorption system is arranged on a pipeline between the dust removal device and the ammonia injection device, and is used for heating the gas after dust removal so as to improve the activity of the catalyst after denitration.
2. The ultra-clean discharge system of claim 1, wherein the thermal desorption system heats the dedusted gas to a temperature above 300 ℃.
3. The ultra-clean discharge system of claim 2, wherein an ash conveying branch pipe is arranged at the bottom of the dust removing device, one end of the ash conveying branch pipe is connected with an ash hopper at the bottom of the dust removing device, the other end of the ash conveying branch pipe is connected with the desulfurization reaction device, and the solid products in the dust removing device are conveyed to the desulfurization reaction device through the ash conveying branch pipe to further participate in the reaction.
4. The ultra-clean discharge system of claim 3, wherein the dust removing device comprises a plurality of ash hoppers, wherein an ash conveying branch pipe is arranged at the bottom of one of the ash hoppers; and the outlet of the ash bucket is connected with a pneumatic conveying pump, and a reaction product in the ash bucket is conveyed to the desulfurization reaction device through the pneumatic conveying pump.
5. The ultra-clean discharge system of claim 1 or 3, wherein the desulfurization reaction device is an SDS desulfurization reactor; the denitration reactor is an activated carbon denitration reactor, and the activated carbon is uniformly distributed in the denitration reactor; the dust removing device is a bag-type dust remover.
6. The ultra-clean discharge system of claim 1, wherein the ammonia injection device is an ammonia injection grid.
7. The ultra-clean discharge system of claim 2, wherein the thermal resolution system comprises a direct fired furnace in-line.
8. The ultra-clean exhaust system of claim 1, wherein the waste heat utilization device is a waste heat boiler.
9. The ultra-clean exhaust system of claim 8, wherein the temperature of the cooled coke oven flue gas obtained through the waste heat utilization device is between 145 ℃ and 150 ℃.
10. The ultra-clean discharge system of claim 1, wherein the velocity of the flue gas entering the interior of the dust removal device is 0.78-0.8 m/min.
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| CN111715068A (en) * | 2020-05-25 | 2020-09-29 | 北京中航泰达环保科技股份有限公司 | Ultra-clean discharge system and method for desulfurization, denitrification and waste heat recycling of coke oven flue gas |
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