CN111662751A - Briquette pyrolysis gas power generation system and control method - Google Patents
Briquette pyrolysis gas power generation system and control method Download PDFInfo
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- CN111662751A CN111662751A CN201910209268.9A CN201910209268A CN111662751A CN 111662751 A CN111662751 A CN 111662751A CN 201910209268 A CN201910209268 A CN 201910209268A CN 111662751 A CN111662751 A CN 111662751A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/58—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
- C10J3/60—Processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1671—Integration of gasification processes with another plant or parts within the plant with the production of electricity
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Abstract
The invention provides a briquette pyrolysis gas power generation system and a control method thereof, and the briquette pyrolysis gas power generation system comprises a dry distillation pyrolysis gasification device, a briquette production processing device, a gas refining device, a tar production processing device and a gas purification device, wherein the dry distillation pyrolysis gasification device is respectively connected with the briquette production processing device and the gas refining device, the gas refining device is respectively connected with the tar production processing device and the gas purification device, the briquette molding production device and the gas power generation device are connected, the briquette molding production device is connected with the dry distillation pyrolysis gasification device and used for processing pulverized coal or powdered carbon, and the gas power generation device is connected with the gas purification device to generate power by taking generated gas as fuel. According to the invention, a thermal power plant and a low-rank coal pyrolysis quality-separation oil-gas-carbon device system are coupled to form a coalification electric system, tar and formed carbon with high additional values are obtained by using inferior coal resources such as pulverized coal and the like, and the coal gas is used for generating electricity, so that the energy conservation, emission reduction and efficiency improvement of the thermal power plant are realized, and meanwhile, the environmental protection treatment of the formed carbon pyrolysis waste gas and smoke is realized.
Description
Technical Field
The invention relates to the field of coal pyrolysis, in particular to a briquette pyrolysis gas power generation system and a control method.
Background
The energy structure of China is expressed as rich coal, lean oil and little gas, compared with petroleum, natural gas and other energy resources, the coal resources of China are rich and are the largest coal producing and consuming countries in the world, and the yield accounts for 37 percent of the total coal yield in the world. The proportion of coal in the primary energy structure of China is about 70%, and the situation is expected not to change fundamentally in the next decades. However, at present, about 80% of coal in China generates electric energy in a direct combustion mode, so that the efficiency is low, resources are wasted, and the environment is polluted, so that the comprehensive utilization of the coal is sought, and the improvement of the added value of the coal becomes a hot spot in the coal chemical industry in recent years.
Shaped carbon (called semi-coke after some coal types are carbonized) is a product converted from coal, and is a solid carbonaceous product with lower volatile content obtained after high volatile content bituminous coal without viscosity or weak viscosity is subjected to low-temperature dry distillation. In the pyrolysis process of the coal, more volatile matters, sulfur, nitrogen and other heteroatoms and moisture are released in advance, and high-quality carbon with low sulfur content (< 0.5%), low volatile matters (< 7%), low ash content (< 10%), high fixed carbon (> 82%), high heat productivity (> 25MJ) and high chemical activity is obtained. As an environment-friendly fuel, the molded carbon has various indexes superior to those of bituminous coal and part of anthracite. The formed carbon has many high-quality characteristics, can replace partial metallurgical coke in the industries of ferroalloy, chemical fertilizer, calcium carbide, blast furnace injection and the like, can also be used as a raw material for preparing methanol, oil, coal water slurry, active carbon, ultra-pure coal and the like from coal, can be directly used for civil and industrial combustion, gasification and the like, and has good market competitiveness.
The existing carbon production process (internal heating carbonization) generally adopted requires that raw material coal has certain granularity (>30mm), and ensures that sufficient gaps exist in the coal so that a flue gas heat carrier can pass through smoothly. However, a large amount of pulverized coal is generated in the coal mining and transporting process, and about 15% of type carbon powder by-products are generated in the type carbon production process. The pulverized coal and the molded carbon powder are difficult to utilize, and easily cause a large amount of overstocking and even waste of resources; in addition, most of raw coke oven gas generated by pyrolysis and carbonization in the shaped carbon production process is returned to the pyrolysis furnace for incineration or discharged by air incineration, so that the utilization efficiency of the raw coke oven gas is low, and the air pollution is serious.
In summary, the technical staff in the field needs to solve the problem of how to use the coal dust and the shaped carbon powder which are difficult to be used for producing the shaped carbon with high added value and other chemical raw materials, and efficiently use the raw coke oven gas to generate electricity, so as to initially realize the industrial mode of the thermal power plant coupled with the coal chemical plant.
Disclosure of Invention
In view of the above, the invention aims to combine the preparation of the molded coal with coal pyrolysis gasification and power generation in a power plant in the coal chemical industry, so that not only can the utilization of coal powder and carbon powder be realized, but also chemical raw materials such as the molded coal and tar can be prepared through pyrolysis gasification, the additional value of the coal powder can be improved, the raw coke oven gas can be used for power generation, and the generated flue gas can be treated to realize clean production.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the briquette pyrolysis gasification device is respectively connected with the briquette production processing device and the coal gas refining device, the coal gas refining device is respectively connected with the tar production processing device and the coal gas purifying device, the briquette forming production device is connected with the briquette pyrolysis gasification device and used for processing raw coal, coal powder or carbon powder, and the coal gas generating device is connected with the coal gas purifying device to generate electricity by taking the generated coal gas as fuel.
Furthermore, the molded coal forming production device comprises a coal preparation device, a bonding agent supply device and a bonding, compressing and shaping device.
Further, the gas power generation device is any one of a pulverized coal boiler co-combustion gas power generation device of a power station, a gas and gas turbine power generation device, a gas internal combustion power generation device, a gas boiler steam turbine power generation device and a gas Stirling power generation device.
Furthermore, the briquette pyrolysis gas power generation system also comprises an ammonia gas treatment device, wherein the ammonia gas treatment device is respectively connected with the coal gas refining device and the coal gas purification device to generate low-temperature ammonia gas to cool and purify the coal gas.
Furthermore, the molded carbon production and treatment device comprises a coke quenching device, a drying device and a coke screening device which are connected in sequence.
Furthermore, the coke quenching device adopts any one of processes of clear water coke quenching, circulating cooling coke quenching, inert gas coke dry quenching and nitrogen coke quenching.
Furthermore, the coal gas refining device comprises a gas collection unit, a gas-liquid separator and a direct cooling tower.
Further, the dry distillation pyrolysis gasification device adopts any one of low-temperature dry distillation, medium-low temperature dry distillation, medium-temperature dry distillation and high-temperature dry distillation.
Further, the tar production and treatment device comprises a tar ammonia water clarification tank and a tar tank.
A control method of a briquette pyrolysis gas power generation system is implemented according to the following steps:
s1: according to the state of raw coal, selectively feeding the raw coal into a molded coal forming production device to produce molded coal meeting the requirements of subsequent processes;
s2: selecting a briquette coal gasification process according to the type and size of the briquette coal, and carrying out gasification reaction to obtain a shaped carbon crude product and raw coke oven gas;
s3: the molded carbon crude product obtained in the step S2 is sent to a molded carbon production processing device for processing;
s4: the raw gas obtained in the step S2 is sent to a gas refining device for processing to obtain gas and crude tar;
s5: the coal gas obtained in the step S4 is sent to a coal gas purification device for purification treatment, and the purified coal gas is sent to a coal gas power generation device for power generation and generates waste gas;
s6: the generated waste gas circularly enters a dry distillation pyrolysis gasification device or is discharged after being treated by a waste gas treatment device.
The invention has the beneficial effects that:
(1) according to the invention, a thermal power plant and a low-rank coal pyrolysis quality-separation oil-gas-carbon device system are coupled to form a coalification electric system, and a process flow for preparing molded carbon by pyrolyzing molded coal is utilized, so that tar and molded carbon with high additional values are obtained, and coal gas is used for generating electricity, thereby realizing energy conservation, emission reduction and efficiency improvement of the thermal power plant.
(2) In the invention, the waste gas or waste water generated by the pyrolysis gasification device and the coal gas purification device is concentrated and then enters the waste gas treatment device for flue gas treatment, thereby realizing clean production.
(3) The invention uses low-price coal surface, coal powder, molded carbon powder and other inferior coal resources as the production raw materials of the molded coal, and reduces the cost of the final product of clean molded carbon.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of the internal structure of a coal briquette pyrolysis gas power generation system.
Fig. 2 is a schematic structural diagram of a coal pyrolysis gas power generation system provided in embodiment 3.
Fig. 3 is a schematic structural diagram of a coal pyrolysis gas power generation system provided in embodiment 4.
Description of the reference numerals
A molded coal forming production device-1,
A dry distillation pyrolysis gasification device-2, a carbonization furnace 202 and an air fan 203;
a gas refining device-3, a gas collecting tank 301, a gas-liquid separator 302 and a direct cooling tower 303;
a coal gas purification device-4, a transverse pipe primary cooler 401, a cold water tank 402, an electric tar precipitator 403, a desulfurization purification device 404, a fresh water pump 405, a first fan 406 and a second fan 407;
gas power generation device-5, power station co-combustion boiler-501, gas turbine or internal combustion engine-502 and power generator-503
A molded carbon production and treatment device-6, a coke quenching device 601, a dryer 602 and a coke screening device 603;
a tar production and treatment device-7, a tar ammonia water clarification tank 701 and a tar tank 702;
an ammonia gas treatment device-8, an ammonia water circulation tank 801 and a steam ammonia generation device 802;
an exhaust gas treatment device-10.
Detailed Description
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
As shown in fig. 1, a briquette pyrolysis gas power generation system includes:
(a) the coal briquette forming production device 1, the dry distillation pyrolysis gasification device 2, the coal gas refining device 3 and the coal gas purification device 4 are sequentially connected and are used for preparing clean coal gas from coal powder or carbon powder;
(b) the molded carbon production and treatment device 6 is connected with the dry distillation pyrolysis gasification device 2 and is used for preparing finished molded carbon;
(c) the tar production and treatment device 7 connected with the coal gas refining device 3 is used for producing finished tar with high added value;
(d) and the gas power generation device 5 is connected with the gas purification device 4 and is used for combusting the gas to generate power.
(e) An ammonia gas treatment device 8 respectively connected with the coal gas refining device 3 and the tar oil production device 7;
(f) and the waste gas treatment device 10 is respectively connected with the coal gas power generation device 5 and the coal gas refining device 3.
Coal powder or carbon powder which has low added value and is difficult to utilize is processed by a coal briquette forming production device 1 to generate formed coal, and the formed coal is subjected to dry distillation, pyrolysis and gasification by a coal briquette forming device 2 to obtain a formed carbon crude product and raw coke oven gas; forming carbon crude products pass through a forming carbon production treatment device 6 to form finished product forming carbon; meanwhile, the raw gas passes through a gas refining device 3 and a tar production and treatment device 7 to generate finished tar; and the coal gas generated by the coal gas refining device 3 is processed by the coal gas purifying device 4 and finally enters the coal gas power generation device 5 to generate power. The waste gas generated by the gas refining device 3 and the gas power generation device 5 is treated by the waste gas treatment device 10 and then is discharged after reaching the standard.
Further, the molded coal forming production device 1 comprises a coal preparation device, a bonding agent supply device and a bonding, compressing and shaping device. And screening the particle size of the coal powder or the carbon powder by the coal dressing equipment. Preferably, the coal powder or carbon powder for forming the briquette has a particle size of less than 0.15mm in a proportion of more than 40 percent. The binder is supplied to the coal dust by a binder supply device, preferably the binder is composed of starch: bentonite: coal tar pitch 2: 7: 5. fully stirring the adhesive and the coal powder (the time is more than 20min), uniformly mixing, and forming by an adhesive compression forming device, wherein the preferable conditions are as follows: the molding pressure is 20MPa, and the molding moisture is 10 percent.
The dry distillation pyrolysis gasification device 2 comprises a carbonization furnace 202 and an air fan 203 connected with the carbonization furnace. The dry distillation pyrolysis gasification device 2 adopts any one of low-temperature dry distillation, medium-low temperature dry distillation, medium-temperature dry distillation and high-temperature dry distillation. Preferably, the invention adopts a medium-temperature dry distillation pyrolysis gasification device. The molded coal forming production device 1 is used for preparing molded coal and supplying the molded coal to the carbonization furnace 202, and the air fan 203 is used for providing air required by combustion for the carbonization furnace 202.
The coal gas refining device 3 is connected with the dry distillation pyrolysis gasification device 2 and comprises a gas collecting tank 301, a gas-liquid separator 302 and a direct cooling tower 303 which are connected in sequence. Raw gas generated by the carbonization furnace 202 is collected in the gas collecting tank 301, and then gas-liquid separation is carried out through a gas-liquid separator 302 to generate a mixture of gas and tar ammonia water; the generated coal gas enters a direct cooling tower 303 for cooling to generate purer coal gas, tar ammonia water mixture and pure ammonia water, and the purer coal gas, the tar ammonia water mixture and the pure ammonia water respectively enter a coal gas purification device 4, a tar production treatment device 7 and an ammonia gas treatment device 8 for further treatment.
The coal gas purification device 4 is connected with the direct cooling tower 303 and comprises a transverse pipe primary cooler 401, a cold water tank 402, an electric tar precipitator 403 and a desulfurization purification device 404. The cross pipe primary cooler 401 is connected with the cold water tank 402 to establish a circulating water path, so that a cold source is provided for the cross pipe primary cooler 401. Preferably, a fresh water pump 405 is arranged on the transverse pipe primary cooler 401, and the fresh water pump 405 is used for supplementing fresh water to the transverse pipe primary cooler 401 to avoid reduction of cold water in the cold water tank 402. The coal gas passing through the direct cooling tower 303 enters a transverse pipe primary cooler 401 for secondary cooling, and then tar in the coal gas is further separated through an electric tar precipitator 403; preferably, a first fan 406 is arranged on a passage between the horizontal pipe primary cooler 401 and the electric tar precipitator 403, and the first fan 406 is used for enhancing the blowing of coal gas into the electric tar precipitator 403; the sulfur in the gas is removed by the desulfurization purification device 404, and finally clean finished gas is produced. Preferably, a second fan 407 is provided on a passage between the electrical tar precipitator 403 and the desulfurization purification apparatus 404, and the second fan 407 is used to reinforce the blowing of the gas into the desulfurization purification apparatus 404.
The gas power generation device 5 comprises a power station co-fired boiler 501, a gas turbine or an internal combustion engine 502 and a generator-503. The finished product gas is introduced into the power station co-combustion boiler 501 for combustion, and the generated steam drives the turbine to do work, thereby driving the generator 503 to generate electricity. Or the finished gas is introduced into a gas turbine or an internal combustion engine 502 for combustion, and then the generator 503 is directly driven to generate electric energy. The gas power generation device 5 is any one of a pulverized coal boiler co-combustion gas power generation device, a gas-gas turbine power generation device, a gas internal combustion power generation device, a gas boiler steam turbine power generation device and a gas Stirling power generation device.
The molded carbon production treatment device 6 is connected with the dry distillation pyrolysis gasification device 2 and comprises a coke quenching device 601, a dryer 602 and a coke screening device 603 which are connected in sequence. The coke quenching device 601 adopts any one of the processes of clear water coke quenching, circulating cooling coke quenching, inert gas coke dry quenching and nitrogen coke quenching. Preferably, the invention adopts a clear water coke quenching process. The formed carbon produced after carbonization and combustion generated by the carbonization furnace 202 of the carbonization pyrolysis gasification device 2 is quenched by a quenching device 601 to generate water-containing formed carbon, and the water-containing formed carbon is sequentially dried by a dryer 602 and screened by a coke screening device 603 to generate finished formed carbon.
The tar production and treatment device 7 is connected with the gas refining device 3 and comprises a tar ammonia water clarification tank 701 and a tar tank 702, wherein the tar ammonia water clarification tank 701 is respectively connected with the gas-liquid separator 302, the direct cooling tower 303, the ammonia water circulating tank 801 and the tar tank 702. Collecting the tar ammonia water mixture generated by the gas-liquid separator 302 and the direct cooling tower 303 to a tar ammonia water clarification tank 701, clarifying, and inputting the clarified tar into a tar tank 452 to obtain finished tar; the separated pure ammonia water is introduced into an ammonia water circulation tank 801. Further, the tar ammonia water clarification tank 701 is connected with a cold water tank 402, cold water can be provided for the tar ammonia water clarification tank 701, and due to the fact that the temperature of coal gas and tar is high, the temperature of the clarification tank after ammonia spraying is high, and water cooling heat absorption waste heat utilization is needed.
The ammonia gas treatment device 8 includes an ammonia water circulation tank 801 and a steam ammonia generation device 802. The ammonia water circulation tank 801 is respectively connected with the tar ammonia water clarification tank 701, the direct cooling tower 303 and the steam ammonia generating device 802. The ammonia water separated in the tar ammonia water clarification tank 701 and the direct cooling tower 303 is collected in an ammonia water circulation tank 801, and the ammonia water is converted into steam ammonia through a steam ammonia generating device 802 and is introduced into a desulfurization purification device 404 for desulfurization purification of coal gas.
The exhaust gas treatment device 10 comprises a flue gas treatment device, an activated carbon adsorption device and a dust remover which are connected in sequence, wherein the flue gas generated by the coal gas power generation device is subjected to denitration and desulfurization through the flue gas treatment device so as to be purified for the first time, then is subjected to secondary purification through the activated carbon adsorption device, and is subjected to solid particle removal through the dust remover so as to form the standard exhaust gas.
Example 2
The invention also provides a control method of the briquette pyrolysis gas power generation system, which is implemented according to the following steps:
s1: according to the state of the coal powder, the coal powder is selectively fed into a coal briquette forming production device 1 to produce the coal briquette meeting the requirements of the subsequent process;
if the particle size of the coal powder meets the molding requirement of the molded coal, namely the particle size is less than 0.15mm and is more than 40%, directly mixing and molding in a molded coal molding production device 1; if the particle size of the coal dust does not meet the molding requirement of the briquette, the coal dust needs to be sent into coal preparation equipment for particle size screening.
S2: selecting a briquette coal gasification process according to the type and size of the briquette coal, and carrying out gasification reaction to obtain a shaped carbon crude product and raw coke oven gas;
the briquette coal gasification process is any one of a fixed bed gasification technology, a fluidized bed gasification technology and an entrained flow bed gasification technology; if the particle size of the briquette is larger than 10mm, a fixed bed gasification technology is selected; if the briquette is of the grain size: selecting a fluidized bed gasification technology for small-particle coal with the particle size of 0.1-10mm, and selecting an entrained flow bed gasification technology if the molded coal is micro-particle coal with the particle size of less than 100 mu m;
the heat-carrying agent of the gasification reaction adopts at least one of flue gas, air and water vapor;
according to the gasification reaction energy balance equation, the amount of the molded coal fed into the dry distillation pyrolysis gasification device 2 and the temperature and the flow of the heat-carrying agent are controlled to carry out gasification reaction,
s3: the molded carbon crude product obtained in the step S2 is sent to a molded carbon production processing device 6 for processing;
quenching the crude molded carbon product by a quenching device 601 to obtain water-containing molded carbon, drying the water-containing molded carbon by a dryer 602, and screening the dried molded carbon by a screening coke device 603 to obtain finished molded carbon with high added value;
s4: the raw gas obtained in the step S2 is sent to a gas refining device for processing 3 to obtain gas and crude tar;
the raw gas is collected in the gas collecting tank 301 and is subjected to gas-liquid separation through the gas-liquid separator 302, so that a gas-tar ammonia water mixture is obtained. Wherein, the tar ammonia water mixture is introduced into a tar ammonia water clarification tank 701 for separating tar and ammonia water, and the separated tar is temporarily stored in a tar tank 702 to obtain finished tar with high added value;
s5: the coal gas obtained in the step S4 is sent to a coal gas purification device 4 for purification treatment, and the purified coal gas is sent to a coal gas power generation device 5 for power generation to generate waste gas;
the gas separated from the gas-liquid separator 302 is cooled by a direct cooling tower 303, and further a gas, tar ammonia water mixture and pure ammonia water are separated. After flowing out of the direct cooling tower 303, the coal gas is secondarily cooled by a transverse pipe primary cooler 401. The cooled gas is deeply decoked by an electric tar precipitator 403 and is desulfurized and purified by a desulfurization and purification device 404, so that finished product gas is obtained and power generation is performed.
S6: the generated waste gas is circularly sent into the dry distillation pyrolysis gasification device 2 or discharged after being processed by the waste gas processing device 10.
Carrying out denitration and desulfurization on waste gas generated from a gas power generation device through a flue gas treatment device so as to carry out primary purification, then carrying out secondary purification through an activated carbon adsorption device, and removing solid particles through a dust remover so as to form waste gas reaching the standard;
in addition, the exhaust gas generated from the desulfurization purification device 404 and the coal gas power generation device 5 may also enter the carbonization pyrolysis gasification device 2 for circulation as required, so as to provide heat for the pyrolysis gas reaction.
Example 3
As shown in figure 2, after the coal powder or the carbon powder is screened by a coal preparation device, a certain amount of adhesive is added, after the mixture is fully stirred and uniformly mixed, the wet coal briquette is formed by a bonding, compressing and shaping device. After removing powder on the surface of the briquette coal, wet briquette coal is put into a carbonization furnace 202 for carbonization, and the carbonization furnace 202 uses the briquette coal as a raw material under the blast of an air fan 203 to produce shaped carbon and raw coke oven gas;
quenching the formed carbon by a quenching device 601 to obtain water-containing formed carbon, drying the water-containing formed carbon by a dryer 602, and screening the dried formed carbon by a screening coke device 603 to obtain finished formed carbon with high added value;
the raw gas is collected in the gas collecting tank 301, and then gas-liquid separation is carried out through the gas-liquid separator 302, so that a gas-tar ammonia water mixture is obtained. Wherein, the tar ammonia water mixture is introduced into a tar ammonia water clarification tank 701 for separating tar and ammonia water, and the separated tar is temporarily stored in a tar tank 702 to obtain finished tar with high added value;
the gas separated from the gas-liquid separator 302 is cooled by a direct cooling tower 303, and further a gas, tar ammonia water mixture and pure ammonia water are separated. Wherein, the tar ammonia water mixture is introduced into a tar ammonia water clarification tank 701 for treatment, and pure ammonia water is introduced into an ammonia water circulation tank 801 for treatment;
and after flowing out of the direct cooling tower 303, the coal gas is secondarily cooled through a transverse pipe primary cooler 401. The cooled coal gas is subjected to deep decoking through an electric tar precipitator 403; then the gas is introduced into the desulfurization purification device 404, and simultaneously the steam ammonia prepared by the steam ammonia generation device 802 is introduced to perform desulfurization purification on the gas, the gas flowing out of the desulfurization purification device 404 is the finished product gas, and power generation is performed.
The gas power generation device 5 is composed of a gas turbine or an internal combustion engine 502 and a power generator 503. The finished gas is introduced into a gas turbine or an internal combustion engine 502 to be combusted instead of part of the fire coal, and the gas turbine or the internal combustion engine 502 converts the heat energy into kinetic energy to drive a generator 503 to generate electricity.
The coal briquette pyrolysis gas power generation system can fully utilize coal powder or carbon powder, can generate high-added-value shaped carbon and tar, and the evolved coal gas can be combusted in a gas turbine or an internal combustion engine 502 to do work to drive a power generator 503 to generate electric energy, so that a complete coal gasification power generation system is formed, and the double aims of energy conservation, emission reduction and efficiency increase of a thermal power plant are fulfilled.
Example 4
As shown in figure 3, after the coal powder or the carbon powder is screened by a coal preparation device, a certain amount of adhesive is added, after the mixture is fully stirred and uniformly mixed, the wet coal briquette is formed by a bonding, compressing and shaping device. After removing powder on the surface of the briquette coal, wet briquette coal is put into a carbonization furnace 202 for carbonization, and the carbonization furnace 202 uses the briquette coal as a raw material under the blast of an air fan 203 to produce shaped carbon and raw coke oven gas;
quenching the formed carbon by a quenching device 601 to obtain water-containing formed carbon, drying the water-containing formed carbon by a dryer 602, and screening the dried formed carbon by a screening coke device 603 to obtain finished formed carbon with high added value;
the raw gas is collected in the gas collecting tank 301, and then gas-liquid separation is carried out through the gas-liquid separator 302, so that a gas-tar ammonia water mixture is obtained. Wherein, the tar ammonia water mixture is introduced into a tar ammonia water clarification tank 701 for separating tar and ammonia water, and the separated tar is temporarily stored in a tar tank 702 to obtain finished tar with high added value;
the gas separated from the gas-liquid separator 302 is cooled by a direct cooling tower 303, and further a gas, tar ammonia water mixture and pure ammonia water are separated. Wherein, the tar ammonia water mixture is introduced into a tar ammonia water clarification tank 701 for treatment, and pure ammonia water is introduced into an ammonia water circulation tank 801 for treatment;
and after flowing out of the direct cooling tower 303, the coal gas is secondarily cooled through a transverse pipe primary cooler 401. The cooled coal gas is subjected to deep decoking through an electric tar precipitator 403; then the gas is introduced into the desulfurization purification device 404, and simultaneously the steam ammonia prepared by the steam ammonia generation device 802 is introduced to perform desulfurization purification on the gas, the gas flowing out of the desulfurization purification device 404 is the finished product gas, and power generation is performed.
The coal gas power generation device 5 is composed of a power station co-combustion boiler 501, a steam turbine and a power generator 503. The finished product gas is introduced into the station co-combustion boiler 501 to be combusted instead of part of the fire coal, so that water is converted into high-temperature steam, the high-temperature steam drives the steam turbine to move to do work, and the generator 503 is driven to generate power.
The coal briquette pyrolysis gas power generation system can fully utilize coal powder or carbon powder, can generate high-added-value shaped carbon and tar, and the evolved coal gas can be combusted in the mixed combustion boiler 501 of the power station to convert water into high-temperature steam, the high-temperature steam drives the steam turbine to move to do work, and further drives the generator 503 to generate electric energy, so that a complete coal gasification power system is formed, and the double aims of energy conservation, emission reduction and efficiency improvement of a thermal power plant are fulfilled.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A briquette pyrolysis gas power generation system, which comprises a dry distillation pyrolysis gasification device (2), a briquette production treatment device (6), a coal gas refining device (3), a tar production treatment device (7) and a coal gas purification device (4), the dry distillation pyrolysis gasification device (2) is respectively connected with a molded carbon production treatment device (6) and a coal gas refining device (3), the coal gas refining device (3) is respectively connected with the tar production and treatment device (7) and the coal gas purification device (4), it is characterized by also comprising a molded coal forming production device (1) and a coal gas power generation device (5), the molded coal forming production device (1) is connected with the dry distillation pyrolysis gasification device (2) and is used for treating raw coal, coal powder or carbon powder, the gas power generation device (5) is connected with the gas purification device (4) to generate power by taking the generated gas as fuel.
2. The system for generating power by pyrolyzing coal and according to claim 1, wherein the briquette coal briquette forming and producing device (1) comprises a coal preparation device, an adhesive supply device and an adhesive compression and shaping device.
3. The briquette pyrolysis gas power generation system according to claim 1, wherein the gas power generation device (5) is any one of a pulverized coal boiler co-fired gas power generation device of a power station, a gas-gas turbine power generation device, a gas internal combustion power generation device, a gas boiler steam turbine power generation device and a gas Stirling power generation device.
4. The briquette pyrolysis gas power generation system according to claim 1, further comprising an ammonia gas treatment device (8), wherein the ammonia gas treatment device (8) is respectively connected with the gas refining device (3) and the gas purifying device (4) to generate low-temperature ammonia gas to cool and purify the gas.
5. The moulded coal pyrolysis gas power generation system of claim 1, wherein the moulded coal production processing device (6) comprises a coke quenching device (601), a dryer (602) and a coke screening device (603) which are connected in sequence.
6. The briquette pyrolysis gas power generation system according to claim 5, wherein the quenching device (601) adopts any one of processes of clear water quenching, circulating cooling quenching, inert gas dry quenching and nitrogen quenching.
7. The coal briquette pyrolysis gas power generation system according to claim 1, wherein the gas refining device (3) comprises a gas collecting tank (301), a gas-liquid separator (302) and a direct cooling tower (303).
8. The briquette pyrolysis gas power generation system according to claim 1, wherein the dry distillation pyrolysis gasification device (2) adopts any one of low-temperature dry distillation, medium-temperature dry distillation and high-temperature dry distillation.
9. The briquette pyrolysis gas power generation system according to claim 1, wherein the tar production and treatment device (7) comprises a tar ammonia water clarification tank (701) and a tar tank (702).
10. The control method of the briquette pyrolysis gas power generation system is characterized by comprising the following steps:
s1: according to the state of raw coal, selectively feeding the raw coal into a molded coal forming production device (1) to produce molded coal meeting the requirements of subsequent processes;
s2: selecting a briquette coal gasification process according to the type and size of the briquette coal, and carrying out gasification reaction to obtain a shaped carbon crude product and raw coke oven gas;
s3: the molded carbon crude product obtained in the step S2 is sent to a molded carbon production processing device (6) for processing;
s4: the raw gas obtained in the step S2 is sent to a gas refining device for treatment (3), and gas and crude tar are obtained;
s5: the coal gas obtained in the step S4 is sent to a coal gas purification device (4) for purification treatment, the purified coal gas is sent to a coal gas power generation device (5) for power generation, and waste gas is generated;
s6: the generated waste gas is circularly fed into the dry distillation pyrolysis gasification device (2) or is discharged after being treated by the waste gas treatment device (10).
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