CN210765154U - System for coal pyrolysis gas power generation of thermal power plant - Google Patents
System for coal pyrolysis gas power generation of thermal power plant Download PDFInfo
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- CN210765154U CN210765154U CN201921285163.3U CN201921285163U CN210765154U CN 210765154 U CN210765154 U CN 210765154U CN 201921285163 U CN201921285163 U CN 201921285163U CN 210765154 U CN210765154 U CN 210765154U
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Abstract
The utility model discloses a coal pyrolysis gas power generation system of a thermal power plant, which comprises a coal dry distillation pyrolysis furnace, a gas purification and separation device and a gas combustion power generation device; a coke gas outlet of the coal dry distillation pyrolysis furnace is communicated with a coke gas inlet of a gas purification and separation device, and a gas outlet of the gas purification and separation device is communicated with a gas inlet of a gas combustion power generation device through a pipeline with a valve; the electric energy output end of the gas combustion generating set is connected with the power grid. The utility model discloses utilize the facility in the thermal power plant, set up coal pyrolysis stove production coal gas, recycle coal gas and pass through internal-combustion engine or gas turbine and drive the generator electricity generation to make coal gas generating set can regard as thermal power plant nimble change response electric wire netting peak shaving frequency modulation demand in certain load range, thereby effectively increase thermal power plant's flexibility.
Description
Technical Field
The invention relates to the field of coal pyrolysis, in particular to a system for generating power by utilizing coal gas generated by pyrolyzing coal in a thermal power plant.
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.
In addition, the peak load regulation and frequency modulation of the power grid auxiliary service in domestic thermal power plants are under increasingly large pressure, and as the power generation proportion of renewable energy sources is increased year by year, large thermal power generating units increasingly undertake the tasks of the power grid auxiliary service such as the peak load regulation and frequency modulation of the power grid. According to the technical experience of flexibility of European thermal power, a gas turbine generating set with the capacity of 50 MW-5 MW is arranged in a large-scale European coal-fired thermal power plant and is used as a requirement for the thermal power plant to quickly respond to the auxiliary service load adjustment of a power grid. However, the direct use of natural gas as a fuel has a problem of high fuel cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a system of pyrolysis of coal gas electricity generation of thermal power plant utilizes the facility in the thermal power plant, sets up pyrolysis of coal stove production coal gas, recycles coal gas and passes through internal-combustion engine or gas turbine and drive the generator electricity generation to make coal gas generating set can regard as thermal power plant nimble change response electric wire netting peak shaving frequency modulation demand in certain load range, thereby effectively increase thermal power plant's flexibility.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a system for generating power by pyrolyzing coal gas in a thermal power plant comprises a coal dry distillation pyrolysis furnace, a coal gas purification and separation device and a coal gas combustion power generation device; the coal dry distillation pyrolysis furnace comprises a coal feeding port, a residue discharge port and a coke gas discharge port; the coal gas purification and separation device comprises a coke gas inlet, a coal gas outlet and a tar outlet; a coke gas outlet of the coal dry distillation pyrolysis furnace is communicated with a coke gas inlet of the coal gas purification and separation device, and a coal gas outlet of the coal gas purification and separation device is communicated with a coal gas inlet of the coal gas combustion power generation device through a pipeline with a valve; and the electric energy output end of the gas combustion generating set is connected with a power grid.
Further, a tar outlet of the gas purification and separation device is communicated with a tar storage tank.
Furthermore, the gas combustion power generation device adopts an internal combustion engine power generation device or a gas turbine power generation device.
Furthermore, a flue gas discharge pipeline of the coal gas combustion power generation device is communicated with the coal dry distillation pyrolysis furnace.
Furthermore, a flue gas discharge pipeline of the gas combustion power generation device is communicated with a hearth or a flue of a pulverized coal boiler of a thermal power plant.
Furthermore, a coal gas outlet of the coal gas purifying and separating device is also communicated with a fuel input port of a multi-fuel burner of the pulverized coal boiler through another pipeline with a valve.
Furthermore, the system also comprises a gas storage device, wherein the inlet of the gas storage device is communicated with the gas outlet of the gas purification and separation device, and the outlet of the gas storage device is communicated with the gas input port of the gas combustion power generation device through a pipeline with a valve and/or communicated with the fuel input port of the multi-fuel burner of the pulverized coal boiler through another pipeline with a valve.
Still further, the gas storage device adopts a high-pressure gas storage device, a high-pressure liquefaction storage device or a cryogenic liquefaction storage device.
Furthermore, the gas purification and separation device adopts any one of a water cooling flushing purification and separation device, an ammonia water cooling flushing purification and separation device, a molecular sieve purification and separation device, a pressure swing adsorption purification and separation device, a cryogenic liquefaction heating gasification separation device and a solution absorption and separation device.
Further, the coal dry distillation pyrolysis furnace adopts any one of a low-temperature dry distillation pyrolysis furnace with the dry distillation temperature of 500-600 ℃, a medium-temperature dry distillation pyrolysis furnace with the dry distillation temperature of 600-800 ℃ or a high-temperature dry distillation pyrolysis furnace with the dry distillation temperature of 800-1100 ℃.
The beneficial effects of the utility model reside in that:
1. the gas, especially clean gas, has high heat value and can be directly used for burning power generation, and the power generation efficiency is higher than that of the power station boiler to generate water vapor to drive a steam turbine no matter the internal combustion engine or the gas turbine is adopted for power generation. The utility model discloses the system prepares coal gas through carrying out the dry distillation pyrolysis, recycles gas burning power generation facility and carries out high-efficient electricity generation, can realize energy saving and emission reduction and increase of thermal power plant to promote thermal power plant's thermal power flexibility, increase thermal power plant peak regulation frequency modulation income.
2. The utility model discloses the inferior coal resources such as low price coal face, buggy, moulded coal powder, moulded carbon powder can be utilized as raw materials for production to the system, reduces the cost of the clean moulded carbon of final product.
3. The utility model discloses the produced waste gas of system gets into thermal power plant's flue gas processing apparatus and carries out the flue gas processing in the lump, can realize cleaner production.
Drawings
Fig. 1 is a schematic diagram of a system structure according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a system structure according to embodiment 2 of the present invention;
fig. 3 is a schematic diagram of a system structure according to embodiment 3 of the present invention;
fig. 4 is a schematic diagram of a system structure according to embodiment 4 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed embodiments and the specific operation processes are provided, but the protection scope of the present invention is not limited to the present embodiment.
Example 1
A system for generating power by coal pyrolysis gas of a thermal power plant is shown in figure 1 and comprises a coal dry distillation pyrolysis furnace 102, a gas purification and separation device 103 and a gas combustion power generation device 104; the coal dry distillation pyrolysis furnace 102 comprises a coal feeding port, a residue discharging port and a coke gas discharging port; the coal gas purification and separation device 103 comprises a coke gas inlet, a coal gas outlet and a tar outlet; a coke gas outlet of the coal dry distillation pyrolysis furnace 102 is communicated with a coke gas inlet of the coal gas purification and separation device 103, and a coal gas outlet of the coal gas purification and separation device 103 is communicated with a coal gas inlet of the coal gas combustion power generation device 104 through a pipeline with a valve; the electric energy output end of the gas combustion generating set 104 is connected to the power grid.
The working principle of the system is as follows: and adding a coal raw material into the coal dry distillation pyrolysis furnace through a coal feeding port, and performing coal pyrolysis through the coal dry distillation pyrolysis furnace to generate coke gas. Discharging the generated coke gas into the gas purification and separation device from the coke gas outlet, and separating tar in the coke gas through the gas purification and separation device to obtain clean coal gas. The coal gas is sent into a coal gas combustion power generation device through a pipeline with a valve, the coal gas combustion power generation device utilizes the coal gas as fuel to burn and generate power, and the generated power can be transmitted to a power grid through a booster station of a thermal power plant. The solid obtained by coal pyrolysis contains carbon, waste residue and/or waste liquid, the carbon can be recycled, and the waste residue and the waste liquid can be treated by using a waste residue treatment device and a waste liquid treatment device of a thermal power plant. The heat source of the coal carbonization pyrolysis furnace can be from flue gas of a pulverized coal boiler, steam of a main steam pipeline or a steam extraction pipeline of a steam turbine of a thermal power plant, and the like.
Through the system, the gas combustion power generation device can be used as a peak-shaving frequency-modulation response unit of a thermal power plant, and when the load of a power grid needs to be quickly lifted, the power generation load of the gas combustion power generation device can be increased or decreased by controlling the conveying capacity of gas, so that the demand of the power grid peak-shaving frequency-modulation auxiliary service is responded.
In this embodiment, the tar outlet of the gas purification and separation device 103 is communicated with the tar storage tank 105. The separated tar is discharged to a tar storage tank 105 for storage.
In the present embodiment, the gas combustion power generation device 104 is an internal combustion engine power generation device or a gas turbine power generation device. The internal combustion engine generator device or the gas turbine generator device drives the generator to generate electricity through the burning of the internal combustion engine or the gas turbine, and the generated energy is fed to a power grid through a booster station of a thermal power plant.
In the present embodiment, the flue gas discharge pipeline of the gas combustion power generation device 104 (internal combustion engine or gas turbine) is communicated with the coal carbonization pyrolysis furnace 102. Through the arrangement, high-temperature flue gas discharged by the coal gas combustion power generation device can be used as a supplementary heat source for dry distillation and gasification of the coal dry distillation pyrolysis furnace.
In this embodiment, the gas outlet of the gas purification and separation device 103 is also connected to the fuel inlet of the multi-fuel burner 106 of the pulverized coal boiler 101 through another pipeline with a valve. The clean coal gas obtained by the coal gas purification and separation device can also be conveyed to a multi-fuel burner of the pulverized coal boiler for combustion-supporting incineration.
Further, in this embodiment, the system further includes a gas storage device 107, an inlet of the gas storage device 107 is communicated with a gas outlet of the gas purification and separation device 103, an outlet of the gas storage device 107 is communicated with a gas inlet of the gas combustion power generation device 104 through a pipeline with a valve, and/or is communicated with a fuel inlet of the multi-fuel burner 106 of the pulverized coal boiler 101 through another pipeline with a valve.
Further, the gas storage device 107 may employ a high-pressure gas storage device, a high-pressure liquefaction storage device, or a cryogenic liquefaction storage device.
In this embodiment, the gas purification and separation device 103 is any one of a water cooling flushing purification and separation device, an ammonia water cooling flushing purification and separation device, a molecular sieve purification and separation device, a pressure swing adsorption purification and separation device, a cryogenic liquefaction warming gasification separation device, and a solution absorption and separation device.
Further, the coal dry distillation pyrolysis furnace 102 is any one of a low-temperature dry distillation pyrolysis furnace with a dry distillation temperature of 500-600 ℃, a medium-temperature dry distillation pyrolysis furnace with a dry distillation temperature of 600-800 ℃ or a high-temperature dry distillation pyrolysis furnace with a dry distillation temperature of 800-1100 ℃.
In this embodiment, the coal dry distillation pyrolysis furnace 102 is a low-temperature dry distillation pyrolysis furnace. After the coal pyrolysis, the discharged solid contains one or more of semi coke, formed coke and coarse coke, and can be further deeply utilized.
Example 2
The system structure of the present embodiment is substantially the same as that of embodiment 1, and the main difference is that, as shown in fig. 2, the flue gas discharge pipeline of the gas combustion power generation device 104 (internal combustion engine or gas turbine) is also communicated with the hearth or flue of the pulverized coal fired boiler 101 of the thermal power plant. When the coal dry distillation pyrolysis furnace can not completely utilize the high-temperature flue gas discharged by the coal gas combustion power generation device, the residual high-temperature flue gas can be conveyed to a furnace chamber or a flue of a pulverized coal boiler of a thermal power plant, so that the residual high-temperature flue gas and the flue gas generated by the pulverized coal boiler are conveyed into a flue gas treatment device together for harmless treatment.
High-temperature flue gas generated after coal gas combustion power generation can heat low-load flue gas of a pulverized coal boiler of a thermal power plant, the temperature of the flue gas is not lower than 310 ℃ before entering SCR, and ammonium bisulfate in the SCR is not condensed.
Example 3
The system structure of this embodiment is substantially the same as that of embodiment 1, and the main difference is that, as shown in fig. 3, the flue gas discharge pipeline of the gas combustion power generation device 104 is not communicated with the coal dry distillation pyrolysis furnace 101, but is conveyed to a raw coal drying device or a heat supply network water pipeline of a thermal power plant to dry raw coal or heat supply network water. In addition, in this embodiment, the coal feeding port is communicated with a coal mill 108 of a thermal power plant, and pulverized coal is directly prepared by the coal mill 108 as a coal raw material.
Example 4
The system structure of this embodiment is substantially the same as that of embodiment 1, and the main difference is that, as shown in fig. 4, in this embodiment, the coal feeding port is communicated with a briquette coal preparation device 109 of a thermal power plant, briquette coal is used as a coal raw material and is added into a coal carbonization pyrolysis furnace 101, and briquette coal can be obtained after pyrolysis of coal.
Various corresponding changes and modifications can be made by those skilled in the art according to the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (10)
1. A system for generating power by coal pyrolysis gas of a thermal power plant is characterized by comprising a coal dry distillation pyrolysis furnace (102), a gas purification and separation device (103) and a gas combustion power generation device (104); the coal dry distillation pyrolysis furnace (102) comprises a coal feeding port, a residue discharging port and a coke gas discharging port; the coal gas purification and separation device (103) comprises a coke gas inlet, a coal gas outlet and a tar outlet; a coke gas outlet of the coal dry distillation pyrolysis furnace (102) is communicated with a coke gas inlet of the coal gas purification and separation device (103), and a coal gas outlet of the coal gas purification and separation device (103) is communicated with a coal gas inlet of the coal gas combustion power generation device (104) through a pipeline with a valve; the electric energy output end of the gas combustion generating set (104) is connected with a power grid.
2. The system for generating power by pyrolyzing coal gas in thermal power plant coal according to claim 1, wherein the tar outlet of the coal gas purifying and separating device (103) is communicated with the tar storage tank (105).
3. The system for generating power by pyrolyzing coal gas in thermal power plant according to claim 1, wherein said gas combustion power generation device (104) is an internal combustion engine power generator device or a gas turbine power generator device.
4. The system for generating power by pyrolyzing coal gas in thermal power plant according to claim 1, wherein the flue gas discharge pipeline of the coal gas combustion power generation device (104) is communicated with the coal dry distillation pyrolysis furnace (102).
5. The system for generating power by pyrolyzing coal in coal of a thermal power plant according to claim 1 or 4, wherein a flue gas discharge pipeline of the coal gas combustion power generation device (104) is communicated with a hearth or a flue of a pulverized coal boiler (101) of the thermal power plant.
6. The system for generating power by pyrolyzing coal gas in thermal power plant according to claim 1, wherein the coal gas outlet of the coal gas purifying and separating device (103) is further communicated with the fuel inlet of the multi-fuel burner (106) of the pulverized coal boiler (101) through another pipeline with a valve.
7. The system for generating power by pyrolyzing coal gas in thermal power plant according to claim 1 or 6, further comprising a coal gas storage device (107), wherein an inlet of the coal gas storage device (107) is communicated with a coal gas outlet of the coal gas purifying and separating device (103), and an outlet of the coal gas storage device (107) is communicated with a coal gas inlet of the coal gas combustion power generation device (104) through a pipeline with a valve and/or communicated with a fuel inlet of a multi-fuel burner (106) of the pulverized coal boiler (101) through another pipeline with a valve.
8. The system for generating power from coal pyrolysis gas of a thermal power plant according to claim 7, wherein the gas storage device (107) adopts a high-pressure gaseous storage device, a high-pressure liquefied storage device or a cryogenic liquefied storage device.
9. The system for generating power by pyrolyzing coal gas in thermal power plant coal according to claim 1, wherein the coal gas purifying and separating device (103) is any one of a water cooling washing purifying and separating device, an ammonia water cooling washing purifying and separating device, a molecular sieve purifying and separating device, a pressure swing adsorption purifying and separating device, a cryogenic liquefaction heating gasification separating device and a solution absorption separating device.
10. The system for generating power by coal pyrolysis gas of a thermal power plant according to claim 1, wherein the coal dry distillation pyrolysis furnace (102) adopts any one of a low-temperature dry distillation pyrolysis furnace with a dry distillation temperature of 500-600 ℃, a medium-temperature dry distillation pyrolysis furnace with a dry distillation temperature of 600-800 ℃ or a high-temperature dry distillation pyrolysis furnace with a dry distillation temperature of 800-1100 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113416562A (en) * | 2021-07-16 | 2021-09-21 | 中煤能源研究院有限责任公司 | Oxygen-enriched low-carbon pyrolysis system utilizing boiler flue gas and using method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113416562A (en) * | 2021-07-16 | 2021-09-21 | 中煤能源研究院有限责任公司 | Oxygen-enriched low-carbon pyrolysis system utilizing boiler flue gas and using method |
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