CN213761280U - Organic waste pyrolysis gasification burning is sintering denitration integration system in coordination - Google Patents
Organic waste pyrolysis gasification burning is sintering denitration integration system in coordination Download PDFInfo
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- CN213761280U CN213761280U CN202022841852.7U CN202022841852U CN213761280U CN 213761280 U CN213761280 U CN 213761280U CN 202022841852 U CN202022841852 U CN 202022841852U CN 213761280 U CN213761280 U CN 213761280U
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Abstract
The utility model belongs to the technical field of flue gas denitration, the utility model relates to an organic waste pyrolysis gasification burning is sintering denitration integration system in coordination, and concrete step is: carrying out pyrolysis gasification on the organic waste to obtain activated carbon and pyrolysis gas; introducing the pyrolysis gas into the sintering furnace to be used as reducing gas to participate in combustion and reduction reaction; and carrying out denitration treatment on the flue gas in the sintering furnace under the condition that the activated carbon is used as a carrier. The solid organic waste pyrolysis gas is used as the reducing gas in the denitration process, the reducing gas in the pyrolysis gas replaces or partially replaces the commonly used amino reducing gas, the problems of ammonia gas leakage, ammonia escape and the like are solved, the process control is carried out in the sintering process of a steel plant, and meanwhile, the activated carbon generated by the pyrolysis gasification furnace is used as a sintering flue gas denitration catalyst carrier, so that the comprehensive denitration cost is obviously reduced.
Description
Technical Field
The utility model belongs to the technical field of flue gas denitration, concretely relates to organic waste pyrolysis gasification burning is sintering denitration integration system in coordination.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
In the sintering production process of iron ore in a sintering plant of iron and steel companies, sintering flue gas contains various atmospheric pollutants, mainly comprises toxic and harmful substances such as particulate matters, sulfur dioxide, nitrogen oxides and the like, and seriously influences the natural ecological environment.
At present, the emission of sulfur dioxide in the sintering process is gradually controlled by the existing high-efficiency desulfurization technology and desulfurization facilities; aiming at flue gas denitration, the flue gas denitration technology widely adopted by the power system cannot be directly applied to sintering flue gas denitration due to the fact that the sintering flue gas temperature is not matched, in order to meet the activity of a sintering flue gas denitration catalyst, flue gas heating and tempering are generally adopted at present, sintering flue gas is improved to 300-350 ℃ from 180-220 ℃, the sintering flue gas after the temperature is improved meets the activity of a low-temperature denitration catalyst, and high-efficiency denitration is realized. Therefore, the energy consumption of the flue gas reheating and tempering process is high; meanwhile, ammonia is used as a reducing agent for denitration in the process, ammonia escape is caused, ozone is generated, and the ecological environment is seriously damaged.
Obviously, the 'end treatment' is not the best choice for solving the environmental pollution, and the 'source reduction-process control-end treatment' three aspects are the optimal strategy for cooperatively controlling the generation and the emission of pollutants in the sintering process. The source control of the sintering process generally adopts coke powder with lower nitrogen content as fuel, but the coal dressing difficulty is higher, the cost is higher, and if biomass fuel is adopted, the occupation problem in a sintering machine is difficult to solve.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the above-mentioned prior art, the utility model aims at providing organic waste pyrolysis gasification burning is sintering denitration integration system and method in coordination. The method has the advantages that organic solid waste pyrolysis gas is used as the reducing gas in the denitration process, the reducing gas in the pyrolysis gas replaces or partially replaces the commonly used amino reducing gas, the problems of ammonia leakage, ammonia escape and the like are solved, process control is carried out in the sintering process of a steel plant, meanwhile, activated carbon generated by a pyrolysis gasification furnace is used as a sintering flue gas denitration catalyst carrier, comprehensive denitration cost is obviously reduced, in addition, the pyrolysis gas has high heat value, heat can be provided for the sintering process, the use ratio of nitrogen-containing fuel is reduced, NOx emission is reduced fundamentally, and simultaneously, the organic waste realizes the optimal utilization of resources.
In order to solve the technical problem, the technical scheme of the utility model is that:
in a first aspect, an organic waste pyrolysis, gasification, combustion, collaborative sintering and denitration integrated method comprises the following specific steps:
carrying out pyrolysis gasification on the organic waste to obtain activated carbon and pyrolysis gas;
introducing the pyrolysis gas into the sintering furnace to be used as reducing gas to participate in combustion and reduction reaction;
and carrying out denitration treatment on the flue gas in the sintering furnace under the catalysis condition that the activated carbon is used as a carrier in a flue.
The organic waste is pyrolyzed to produce reducing gas and obtain porous active carbon, and the reducing gas is introduced into the sintering furnace to reduce NOxGases, reducing the generation of NO in the sintering furnace from the sourcex。
The problems of low sintering flue gas temperature and low denitration efficiency are solved. Reducing NO in flue gas from sintering machinexGas content, reducing gas then enabling combustion to produce most of the NOxReduction of gas to N2And H2O gas greatly reduces the content of NOx in the sintering flue gas, improves the temperature of the flue gas generated by the sintering furnace, and is favorable for improving the denitration efficiency of the denitration device.
In the denitration device, the porous active carbon generated in the pyrolysis process is used as a carrier to remove the residual NO in the flue gasxThe gas is catalytically removed.
In some embodiments of the present invention, the temperature at which the organic waste is pyrolyzed is 750-. The oxygen content is extremely low and close to zero. The pyrolysis gasification process controls a certain air-fuel ratio, maintains specific temperature and oxygen content, realizes gas-carbon CO-production, can adjust the yield of the activated carbon, and ensures that the main components of the obtained pyrolysis gas are reducing gases (CO and H)2、CH4Etc.).
In some embodiments of the present invention, the organic waste is organic solid waste, in particular agricultural waste, lignin, wood, bamboo, etc.
In some embodiments of the present invention, the main components of the pyrolysis gas are CO and H2、CH4And the like. Through the pyrolysis process of the organic solid waste, gas having reducibility is generated.
In some embodiments of the present invention, the pyrolysis gas is subjected to a dust removal purification process before being introduced into the sintering furnace. Dust particles and part of tar are removed.
In some embodiments of the present invention, in the sintering furnace, the iron ore powder, the flux and the fuel are mixed and combusted to generate the flue gas, and the pyrolysis gas and NO in the flue gasxAnd (4) reacting. Iron powder ore, flux (limestone, quicklime, slaked lime, dolomite, magnesite and the like) and fuel (coke powder and anthracite) and the like are matched according to the required proportion, are flatly paved on a sintering trolley, and are sintered into blocks through ignition and air draft, and the sintering process can be divided into the following steps: drying to remove water, preheating sintering material, burning fuel, high-temperature consolidation and cooling. The solid fuel is burned in the combustion layer to release heat, thereby obtaining a high temperature. Pyrolysis gas and high concentration NOxSufficiently contacting to complete chemical reaction to make part of NOxReduction to N2And H2O gas to realize denitration in the sintering process, and belongs to a process control method for reducing NOxAnd (5) discharging. The reductive combustible gas participates in combustion, contributes a large amount of heat energy, and can reduce the use ratio of the nitrogenous fuelExample, reduction of NO by "source reduction" methodxDischarging without affecting the main sintering process and sintering quality.
In some embodiments of the present invention, the temperature of the reaction in the sintering furnace is 1250 to 1500 ℃.
In some embodiments of the present invention, the flue gas generated by the sintering furnace is subjected to a dust removal process before the denitration. Removing dust particles in the flue gas.
The second aspect, organic waste pyrolysis gasification burning is sintering denitration integration system in coordination, including the pyrolysis gasifier, first dust remover, fritting furnace, the denitrification facility that loop through the gas piping connection, the top of fritting furnace sets up two air distributors, is located the middle section and the back end of fritting furnace respectively, and denitrification facility is sent into to the active carbon that pyrolysis gasifier produced.
The problems of high coal preparation difficulty, high cost, adoption of biomass fuel and occupation in a sintering machine are solved. The organic solid waste is pyrolyzed to obtain porous activated carbon, then reducing gas is generated and enters the sintering furnace, and the reducing gas is combusted to generate a large amount of heat, so that the temperature in the sintering furnace is favorably improved.
The pyrolysis gas is sent into a sintering furnace to participate in combustion reduction reaction, the activated carbon generated by the pyrolysis gasification furnace is used as a carrier in a denitration device to denitrate the flue gas in the sintering furnace, and the pyrolysis gas and NO of the flue gas are heated in the sintering furnacexReaction is carried out to reduce NO in the flue gas in the sintering furnacexAnd (4) discharging. The denitration device uses activated carbon as a carrier for catalysis, so that the denitration efficiency is improved.
In some embodiments of the present invention, the first dust collector is connected to the sintering furnace through the pyrolysis gas inlet pipe, and the two air distributors are connected to the pyrolysis gas inlet pipe respectively.
The utility model discloses an among some embodiments, still include the second dust remover, the second dust remover is located the pipeline that fritting furnace and denitrification facility are connected.
The utility model discloses an among some embodiments, still include the chimney, denitrification facility is connected with the chimney.
The utility model discloses an in some embodiments, still include first fan, second fan, third fan, first fan is located the pipeline that first dust remover and fritting furnace are connected, and the second fan is located the pipeline that fritting furnace and denitrification facility are connected, and the third fan is located the connecting pipeline of denitrification facility and chimney.
The utility model discloses one or more technical scheme has following beneficial effect:
1. the utility model adopts the strategy of 'source reduction-process control-end treatment' to control the generation of NOx in the sintering section of the steel plant, and reduces the denitration treatment cost of sintering flue gas;
2. the reducing gas of the utility model reduces NOx in the sintering process, and reduces the use of amino reducing agent, thereby obviously reducing the problems of ammonia gas leakage, ammonia escape and the like;
3. the utility model discloses insert the reducing combustible gas in the sintering machine, reduce the use proportion of nitrogenous fuel, adopt "source to cut down" the method and reduce NOx and discharge, do not influence sintering raw materials ratio, do not influence main sintering technology and sintering quality;
4. the activated carbon produced by the pyrolysis gasification furnace is utilized in situ and used as a carrier of a low-temperature denitration catalyst, so that high-efficiency denitration is realized, the tail end treatment denitration efficiency is improved, and the emission of toxic and harmful gases in the sintering process is reduced;
5. the utility model discloses to organic solid waste multi-stage utilization, realize organic solid waste pyrolysis in coordination with nonselective denitration integration, simple process, equipment cost is low
6. The utility model discloses denitration can adopt current SCR low temperature denitration technology in the flue gas behind the sintering machine, and the formation of about 35-40% NOx can be reduced in the pyrolysis gas reduction denitration in the sintering machine, the utility model discloses "source reduction-process control" denitration technology reduces the formation of NOx, and subsequent active carbon carrier denitration catalyst has further synergism to "end treatment";
7. the utility model discloses also can be used for large-scale coal fired boiler, but its "not occupy the place" advantage is most outstanding in sintering process, and the sintering raw materials has the strict control, simultaneously because sintering flue gas volume is big, NOx's production proportion is high, and the denitration is with high costs, the utility model discloses be applied to sintering plant NOx's "the source and cut down-process control-terminal improvement", to steel plant sintering process denitration validity most showing.
Drawings
The accompanying drawings, which form a part of the specification, 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 unduly.
FIG. 1 is a structural diagram of an organic waste pyrolysis gasification combustion synergistic sintering denitration integrated system;
FIG. 2 is a block diagram of a sintering machine section;
the device comprises a pyrolysis gasification furnace 1, a bag type dust collector 2, a first fan 3, a sintering machine 4, an air distributor 5, an electric dust collector 6, a second fan I, a second fan 8, an SCR reactor 9, a third fan 10, a chimney 11 and pyrolysis activated carbon.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. The present invention will be further explained with reference to the following examples
Example 1
Organic waste pyrolysis gasification burning is sintering denitration integration system in coordination, including the pyrolysis gasifier, first dust remover, fritting furnace, the denitrification facility that loop through the gas piping connection, the top of fritting furnace sets up two air distributors, is located the middle section and the back end of fritting furnace respectively, and denitrification facility is sent into to the active carbon that pyrolysis gasifier produced.
The top of the sintering furnace is provided with an air distributor for distributing the pyrolysis gas, so that the pyrolysis gas is fully dispersed. The amount of gas entering the middle section may be less than the amount of gas entering the rear section.
The pyrolysis gas inlet of the sintering furnace is positioned at the middle section and the rear section of the sintering furnace and has the following functions: a large amount of NO is generated in the middle and rear sections of the sintering furnacexAnd in a sintering machine of an iron and steel plant, the material trolley is gradually moved backwards after being ignited at the front end of the sintering machine, and sintering is completed in the process of moving from the front end to the rear end, so that pyrolysis gas is respectively introduced into the middle section and the rear section to perform reaction, and insufficient reaction is avoided during concentrated reaction of the rear section. The reaction is firstly carried out in the middle section, then the concentrated reaction is carried out in the rear section, the reaction efficiency can be improved, the reaction is more sufficient, the combustion reaction in the sintering machine is more concentrated, and the generated NO isxMore gas is generated, so that the pyrolysis gas is fully participated in the reaction in the sintering furnace, and the NO in the flue gas is fully reducedxGas content.
Organic solid waste has produced pyrolysis gas and porous active carbon after carrying out the pyrolysis in the pyrolysis gasifier, and pyrolysis gas gets into the sintering furnace and participates in the reaction after first dust remover dust removal, then the flue gas that the sintering furnace produced gets into denitrification facility and carries out the denitration, and first dust remover can be the bag collector.
The two air distributors are respectively connected with an inlet pipe of pyrolysis gas.
The device also comprises a second dust remover, wherein the second dust remover is positioned on a pipeline for connecting the sintering furnace and the denitration device. The second dust remover can be an electric dust remover, and the smoke generated by the sintering furnace is subjected to the electric dust remover to remove dust.
Still include the chimney, denitrification facility is connected with the chimney. The denitration device can be an SCR denitration integrated device, and in the denitration device, the low-temperature denitration catalyst takes activated carbon as a carrier to carry out catalytic reaction denitration on flue gas. And then the flue gas is discharged through a chimney.
The device is characterized by further comprising a first fan, a second fan and a third fan, wherein the first fan is located on a pipeline where the first dust remover is connected with the sintering furnace, the second fan is located on a pipeline where the sintering furnace is connected with the denitration device, and the third fan is located on a connecting pipeline where the denitration device is connected with the chimney. The first fan, the second fan and the third fan provide power for the gas.
Example 2
On the basis of the denitration integrated system in the embodiment 1, the organic waste pyrolysis gasification combustion and sintering denitration integrated method is carried out, organic waste solid waste is pyrolyzed and gasified in the pyrolysis furnace gasification 1, the pyrolysis gasification process is controlled at a certain air-fuel ratio of 0.25-0.35, and the pyrolysis temperature is 800 ℃. Realizes the CO-production of gas and carbon, can adjust the yield of the active carbon, and obtains pyrolysis gas (CO and H)2、CH4Etc.) through the bag-type dust removal purification device 2, filtering out more than 95% of dust particles and part of tar, then pressurizing and sending the dust particles and part of tar into the sintering machine 4 through a pipeline system by a first fan 3, distributing and controlling the dust particles and part of tar at the middle rear end of the sintering machine 4 through an air distributor 5, fully contacting with high-concentration NOx, and ensuring that the reaction condition in the sintering furnace is 1350 ℃. Complete chemical reaction to reduce part of NOx to N2And H2And O gas is used for realizing denitration in the sintering process, and the method belongs to a process control method for reducing NOx emission. The reducing combustible gas participates in combustion, contributes a large amount of heat energy, can reduce the use proportion of nitrogenous fuel, belongs to a source reduction method to reduce NOx emission, and does not influence the main sintering process and sintering quality; after dust particles of sintering flue gas are removed by an electric dust collector 6, the sintering flue gas is sent into a denitration reactor 8 by a second fan 7, pyrolysis activated carbon 11 generated by a pyrolysis gasification furnace 1 is converted into a low-temperature denitration catalyst carrier in situ and is used for a flue gas denitration process in the sintering tail flue gas denitration reactor 8, the method belongs to a 'tail end treatment' method for reducing NOx emission, after denitration is completed, clean flue gas is pressurized by a third fan 9 and sent into a chimney 10 to be discharged at high altitude, and after sintering denitration is completed, the clean flue gas is discharged.
The utility model provides a solid organic waste pyrolysis gas is non-catalytic denitration integration technique and system of selectivity in coordination, integrated "the source is reduced", "process control" and "end is administered" full flow and is reduced the technology that pollutant discharged in coordination, system simple structure, equipment processing cost is low, energy-conserving effect is showing for the denitration cost of sintering plant reduces about 35-40%, and has realized the optimal utilization of organic solid waste resource.
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 (5)
1. Organic waste pyrolysis gasification burning is sintering denitration integration system in coordination, its characterized in that: including the pyrolysis gasifier, first dust remover, fritting furnace, the denitrification facility that loop through the gas piping connection, the top of fritting furnace sets up two air distributors, is located the middle section and the back end of fritting furnace respectively, and denitrification facility is sent into to the active carbon that pyrolysis gasifier produced.
2. The organic waste pyrolysis, gasification, combustion, co-sintering and denitration integrated system as claimed in claim 1, wherein: the first dust remover is connected with the sintering furnace through a pyrolysis gas inlet pipe, and the two air distributors are respectively connected with the pyrolysis gas inlet pipe.
3. The organic waste pyrolysis, gasification, combustion, co-sintering and denitration integrated system as claimed in claim 1, wherein: the device also comprises a second dust remover, wherein the second dust remover is positioned on a pipeline for connecting the sintering furnace and the denitration device.
4. The organic waste pyrolysis, gasification, combustion, co-sintering and denitration integrated system as claimed in claim 1, wherein: still include the chimney, denitrification facility is connected with the chimney.
5. The organic waste pyrolysis, gasification, combustion, co-sintering and denitration integrated system as claimed in claim 1, wherein: the device is characterized by further comprising a first fan, a second fan and a third fan, wherein the first fan is located on a pipeline where the first dust remover is connected with the sintering furnace, the second fan is located on a pipeline where the sintering furnace is connected with the denitration device, and the third fan is located on a connecting pipeline where the denitration device is connected with the chimney.
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| CN114191963A (en) * | 2021-12-28 | 2022-03-18 | 醴陵市永诚电瓷电器有限公司 | Batch-type electric porcelain kiln flue gas denitration device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114191963A (en) * | 2021-12-28 | 2022-03-18 | 醴陵市永诚电瓷电器有限公司 | Batch-type electric porcelain kiln flue gas denitration device |
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