CN110846060A - Pulverized coal pyrolysis and coke powder combustion power generation coupling system and method - Google Patents
Pulverized coal pyrolysis and coke powder combustion power generation coupling system and method Download PDFInfo
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- CN110846060A CN110846060A CN201911287314.3A CN201911287314A CN110846060A CN 110846060 A CN110846060 A CN 110846060A CN 201911287314 A CN201911287314 A CN 201911287314A CN 110846060 A CN110846060 A CN 110846060A
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- 239000003245 coal Substances 0.000 title claims abstract description 179
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 129
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 238000010248 power generation Methods 0.000 title claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 33
- 230000008878 coupling Effects 0.000 title claims abstract description 17
- 238000010168 coupling process Methods 0.000 title claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 7
- 239000000843 powder Substances 0.000 claims abstract description 97
- 238000000926 separation method Methods 0.000 claims abstract description 24
- 238000011084 recovery Methods 0.000 claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 18
- 239000000446 fuel Substances 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 85
- 239000011280 coal tar Substances 0.000 claims description 22
- 239000011269 tar Substances 0.000 claims description 19
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 14
- 239000003546 flue gas Substances 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000000571 coke Substances 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000011286 gas tar Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2201/00—Staged combustion
- F23C2201/30—Staged fuel supply
- F23C2201/301—Staged fuel supply with different fuels in stages
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Coke Industry (AREA)
Abstract
The invention provides a pulverized coal pyrolysis and coke powder combustion power generation coupling system, wherein a raw coal outlet of a raw coal bin is connected with a raw coal inlet of a mill, an outlet of the mill is connected with an inlet of a cyclone separator, a coarse coal powder outlet of the cyclone separator is connected with an inlet of a coarse coal powder buffer bin, a fine coal powder outlet of the cyclone separator is connected with an inlet of a bag-type dust collector, and a fine coal powder outlet of the bag-type dust collector is connected with an inlet of a fine coal powder buffer bin; a coarse coal powder outlet of the coarse coal powder buffer bin is connected with a coarse coal powder inlet of the pyrolysis reactor, an outlet of the pyrolysis reactor is connected with an inlet of the separation system, a solid outlet of the separation system is connected with an inlet of the coke powder buffer bin, and a gas outlet of the separation system is connected with an inlet of the tar recovery system; the fine coal powder outlet of the fine coal powder buffer bin and the hot coke powder outlet of the coke powder buffer bin are connected with a boiler fuel inlet, and the boiler steam outlet is connected with a generator set. The invention can not only improve the utilization rate of pulverized coal, but also reduce the energy consumption of combustion power generation, does not need to greatly reform a power generation boiler, and has low cost.
Description
Technical Field
The invention relates to the field of coal chemical industry, in particular to a system and a method for power generation coupling of pulverized coal pyrolysis and pulverized coke combustion.
Background
With the improvement of the mechanization degree of coal mining, a large amount of cheap pulverized coal resources in each large coal production area cannot be utilized. The coal pyrolysis technology is one of the important ways for the efficient and clean utilization of coal resources, and the pyrolysis of coal has become the focus of research of each unit in recent years, but the research mainly focuses on the aspect of block-surface pyrolysis, and the research and the report on the aspect of pulverized coal pyrolysis are not available.
The power industry has developed rapidly, with combustion power generation being the primary means of power supply. How to reduce the energy consumption of combustion power generation is a major subject of realizing the purposes of energy conservation and emission reduction in industry. IGCC (integrated gasification combined cycle power generation system) is an advanced power system that combines coal gasification technology with an efficient combined cycle. It is composed of two parts, namely a coal gasification and purification part and a fuel gas-steam combined cycle power generation part. However, the IGCC needs to be implemented by a large modification of the existing power generation boiler, requires a large amount of investment, is high in cost, and is not suitable for wide-range popularization.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system and a method for coupling pulverized coal pyrolysis and pulverized coke combustion power generation, which can improve the utilization rate of pulverized coal, reduce the energy consumption of combustion power generation, do not need to greatly transform a power generation boiler and have low cost.
A pulverized coal pyrolysis and coke powder combustion power generation coupling system comprises: the system comprises a raw coal bin, a mill, a cyclone separator, a bag type dust collector, a coarse coal powder buffer bin, a fine coal powder buffer bin, a pyrolysis reactor, a separation system, a coke powder buffer bin, a tar recovery system, a boiler and a generator set;
a raw coal outlet of the raw coal bin is connected with a raw coal inlet of a mill, an outlet of the mill is connected with an inlet of a cyclone separator, a coarse coal powder outlet of the cyclone separator is connected with an inlet of a coarse coal powder buffer bin, a fine coal powder outlet of the cyclone separator is connected with an inlet of a bag-type dust collector, and a fine coal powder outlet of the bag-type dust collector is connected with an inlet of a fine coal powder buffer bin;
a coarse coal powder outlet of the coarse coal powder buffer bin is connected with a coarse coal powder inlet of the pyrolysis reactor, an outlet of the pyrolysis reactor is connected with an inlet of the separation system, a solid outlet of the separation system is connected with an inlet of the coke powder buffer bin, and a gas outlet of the separation system is connected with an inlet of the tar recovery system;
the fine coal powder outlet of the fine coal powder buffer bin and the hot coke powder outlet of the coke powder buffer bin are connected with a boiler fuel inlet, and the boiler steam outlet is connected with a generator set.
Preferably, the tar recovery system is provided with a coal tar outlet and a pyrolysis gas outlet, the pyrolysis gas at the pyrolysis gas outlet is divided into two streams, one stream of pyrolysis gas is led out, and the other stream of pyrolysis gas enters the pyrolysis reactor;
still include air heater and fan, the air outlet and the air heater entry linkage of fan, air heater's hot-blast gas inlet connection that goes out pyrolysis reactor.
Further, still include the roots's fan, the air outlet and the fine coal powder export of fine coal powder surge bin and the hot burnt powder exit linkage of burnt powder surge bin of roots's fan, and air heater's hot air outlet still with boiler fuel entry linkage.
Preferably, the device also comprises a heat exchanger; the tar recovery system is provided with a coal tar outlet and a pyrolysis gas outlet, pyrolysis gas at the pyrolysis gas outlet is divided into two streams, one stream of pyrolysis gas is led out, the other stream of pyrolysis gas enters the heat exchanger from a cold fluid inlet of the heat exchanger, and the cold fluid outlet of the heat exchanger is connected with a gas inlet of the pyrolysis reactor;
the high-temperature flue gas outlet of the boiler is connected with the hot fluid inlet of the heat exchanger, and the hot fluid outlet of the heat exchanger is connected with the fine coal powder outlet of the fine coal powder buffer bin and the hot coke powder outlet of the coke powder buffer bin.
Still include air heater and fan, fan air outlet and air heater entry linkage, air heater hot air outlet and boiler fuel entry linkage.
Preferably, the tar recovery system is provided with a coal tar outlet and a pyrolysis gas outlet, and the pyrolysis gas outlet is connected with the fine coal powder outlet of the fine coal powder buffer bin and the hot coke powder outlet of the coke powder buffer bin;
still include air heater and fan, fan air outlet and air heater entry linkage, air heater hot air outlet and boiler fuel entry linkage.
Furthermore, a high-temperature flue gas outlet of the boiler is connected with a gas inlet of the pyrolysis reactor.
Preferably, the solid outlet of the separation system is connected with the inlet of the coke powder buffer bin through a dry quenching device.
Preferably, the grinding mill further comprises an air preheater and a fan, wherein an air outlet of the fan is connected with an inlet of the air preheater, and a hot air outlet of the air preheater is connected with a gas inlet of the grinding mill.
Preferably, the tail gas outlet of the bag type dust collector is connected with a chimney.
A power generation method coupling pulverized coal pyrolysis and pulverized coke combustion power generation is characterized in that raw coal is crushed and then separated into coarse pulverized coal and fine pulverized coal through a cyclone separator, the coarse pulverized coal is subjected to pyrolysis reaction, products of the pyrolysis reaction are separated to obtain pyrolysis gas, coal tar and hot pulverized coke, the hot pulverized coke and the fine pulverized coal are fed into a boiler to be combusted, and generated hot steam is fed into a generator set to generate power.
Compared with the prior art, the invention has the following beneficial technical effects:
the system couples semicoke generated by pyrolysis with a power plant boiler for power generation, obtains coarse coal powder and fine coal powder by separating coal powder, and carries out pyrolysis reaction on the coarse coal powder to generate pyrolysis gas, coal tar and hot coke powder, wherein the hot coke powder and the fine coal powder are all sent into the boiler for combustion and power generation. According to the invention, on the premise that the existing boiler is not changed, clean utilization of coal can be realized only by adding a small amount of investment, the system fully utilizes sensible heat of semicoke under the condition of additional production of coal tar and pyrolysis gas, the system energy efficiency is improved, the unit energy consumption of a power plant is obviously reduced, the stepped utilization of pulverized coal is realized, the utilization rate of the pulverized coal is improved, and the 'dry-eating and clean-pressing' is realized for the utilization of coal.
Furthermore, the pyrolysis gas at the pyrolysis gas outlet is divided into two parts, one part of the pyrolysis gas is led out, and the other part of the pyrolysis gas enters the pyrolysis reactor, so that the self-sufficiency of a heat source required by the pyrolysis reaction can be realized.
Furthermore, the fuel heat delivery is realized by utilizing a boiler heat source, and the energy consumption is reduced.
Furthermore, the high-temperature hot flue gas of the boiler is used for indirectly exchanging heat of the pyrolysis gas, so that the quality of the pyrolysis gas is improved.
Furthermore, the pyrolysis gas is used for conveying fuel and air to directly enter the boiler for combustion, so that the energy efficiency is improved.
Furthermore, the high-temperature hot flue gas of the boiler is used as a pyrolysis reaction to improve a heat source.
Further, a dry quenching device is arranged to realize the cooling of the high-temperature coke breeze.
Further, a hot air outlet of the air preheater is connected with a gas inlet of the mill, so that a heat source of the pulverizing system is provided by a boiler.
Drawings
FIG. 1 is a schematic view showing a flow of pulverized coal pyrolytic coke powder heat transfer and combustion power generation in example 1 of the present invention;
FIG. 2 is a schematic flow chart of pulverized coal pyrolysis coke powder heat transfer combustion power generation and high-temperature flue gas indirect heat exchange in embodiment 2 of the present invention;
FIG. 3 is a schematic flow chart of the pulverized coal pyrolysis coke powder hot feeding combustion power generation and the direct feeding of high temperature flue gas into the reactor in embodiment 3 of the present invention;
in the figure: the device comprises a raw coal bin 1, a coal feeder 2, a mill 3, a cyclone separator 4, a bag type dust collector 5, a chimney 6, a first Roots blower 7, a coarse coal powder buffer bin 8, a fine coal powder buffer bin 9, a pyrolysis reactor 10, a separation system 11, a coke powder buffer bin 12, a tar recovery system 13, a second Roots blower 14, a primary air box 15, a secondary air box 16, a combustor 17, a boiler 18, an air preheater 19, a fan 20, a generator set 21, pyrolysis gas 22, coal tar 23, a dry quenching device 24, high-temperature flue gas 25 and a heat exchanger 26.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Example 1
As shown in fig. 1, the pulverized coal pyrolysis and coke powder combustion power generation coupling system of the embodiment includes: the device comprises a raw coal bin 1, a coal feeder 2, a mill 3, a cyclone separator 4, a bag type dust collector 5, a chimney 6, a first Roots blower 7, a coarse coal powder buffer bin 8, a fine coal powder buffer bin 9, a pyrolysis reactor 10, a separation system 11, a coke powder buffer bin 12, a tar recovery system 13, a second Roots blower 14, a primary air box 15, a secondary air box 16, a combustor 17, a boiler 18, an air preheater 19, a fan 20, a generator set 21, pyrolysis gas 22, coal tar 23 and a dry quenching device 24.
The raw coal outlet of the raw coal bin 1 is connected with the raw coal inlet of the mill 3 through the coal feeder 2, the outlet of the mill 3 is connected with the inlet of the cyclone separator 4, the coarse coal powder outlet of the cyclone separator 4 is connected with the inlet of the coarse coal powder buffer bin 8, the fine coal powder outlet of the cyclone separator 4 is connected with the inlet of the bag-type dust collector 5, the tail gas outlet of the bag-type dust collector 5 is connected with the chimney 6, and the fine coal powder outlet of the bag-type dust collector 5 is connected with the inlet of the fine coal powder buffer bin 9.
The coarse coal powder outlet of the coarse coal powder buffer bin 8 is connected with the coarse coal powder inlet of the pyrolysis reactor 10, the outlet of the pyrolysis reactor 10 is connected with the inlet of the separation system 11, the solid outlet of the separation system 11 is connected with the inlet of the coke powder buffer bin 12 (or connected with the inlet of the coke powder buffer bin 12 through the dry quenching device 24), the gas outlet of the separation system 11 is connected with the inlet of the tar recovery system 13, the tar recovery system 13 is provided with a coal tar outlet and a pyrolysis gas outlet, the pyrolysis gas at the pyrolysis gas outlet is divided into two streams, one stream of pyrolysis gas is led out, and the other stream of pyrolysis gas is sent into the pyrolysis reactor 10 through the first roots blower 7.
The fine coal powder outlet of the fine coal powder buffer bin 9 and the hot coke powder outlet of the coke powder buffer bin 12 are sequentially connected with the raw material inlet of a boiler 18 through a second Roots blower 14, a primary air box 15 and a combustor 17, the air outlet of the blower 20 is connected with the inlet of an air preheater 19, the hot air outlet of the air preheater 19 is connected with the inlet of the combustor 17 through a secondary air box 16, and the steam outlet of the boiler 18 is connected with a generator set 21.
The hot air outlet of the air preheater 19 is also connected to the gas inlets of the mill 3 and the pyrolysis reactor 10, respectively.
Raw coal in a raw coal bin 1 is fed into a mill 3 through a coal feeder 2 and ground, then coarse coal powder is separated through a cyclone separator 4 and enters a coarse coal powder buffer bin 8, fine coal powder is collected by a bag type dust collector 5 and enters a fine coal powder buffer bin 9, tail gas is discharged through a chimney 6, a coal powder drying heat source is provided by preheated air of an air preheater 19, and power is provided by a fan 20;
the coarse coal powder in the coarse coal powder buffer bin 8 enters a pyrolysis reactor 10 for pyrolysis and then enters a separation system 11 for gas-solid separation, the separated hot coke powder enters a coke powder buffer bin 12 (or the hot coke powder enters the coke powder buffer bin 12 after being cooled by a dry quenching device 24), the separated gas enters a tar recovery system 13 for collection to obtain pyrolysis gas 22 and coal tar 23, wherein part of the pyrolysis gas is sent into the pyrolysis reactor 10 through a Roots blower 7, the reaction air is provided by an air preheater 19, and the power is provided by a blower 20;
the fine coal powder buffer bin 9 conveys the fine coal powder and the coke powder buffer bin 12 hot coke powder to a primary air box through a Roots blower 14 and air (or pyrolysis gas 22) is conveyed to a boiler 18 through a combustor 17 for combustion, secondary air is conveyed to an air preheater 19 through a blower 20 for preheating and then conveyed to the boiler through a secondary air box 16 for combustion supporting, and steam heated by the boiler 18 is conveyed to a generator set 21 for power generation;
the system produces pyrolysis gas 22 and coal tar 23;
wherein the temperature of hot coke powder in the coke powder buffer bin 12 is 450-550 ℃, and the temperature of fine coal powder in the fine coal powder buffer bin 9 is room temperature.
The system of the embodiment can realize the cascade utilization of the pulverized coal, fully utilize the sensible heat of the semicoke and improve the energy efficiency of the system; coal tar and pyrolysis gas are produced, and the economic benefit is good.
Example 2
As shown in fig. 2, unlike embodiment 1: this embodiment 2 does not set up second roots's fan 14, sets up heat exchanger 26, and one strand pyrolysis gas of tar recovery system 13 is drawn forth, and another strand pyrolysis gas sends into heat exchanger 26 cold fluid entry through first roots's fan 7, and the cold fluid export of heat exchanger 26 is connected with the gas inlet of pyrolytic reaction ware 10. The high-temperature flue gas outlet of the boiler 18 is connected with the hot fluid inlet of the heat exchanger 26, and the hot fluid outlet of the heat exchanger 26 is connected with the fine coal powder outlet of the fine coal powder buffer bin 9 and the hot coke powder outlet of the coke powder buffer bin 12. The hot air outlet of the air preheater 19 is not connected to the gas inlet of the pyrolysis reactor 10.
Raw coal in a raw coal bin 1 is fed into a mill 3 through a coal feeder 2 and ground, then coarse coal powder is separated through a cyclone separator 4 and enters a coarse coal powder buffer bin 8, fine coal powder is collected by a bag type dust collector 5 and enters a fine coal powder buffer bin 9, tail gas is discharged through a chimney 6, a coal powder drying heat source of the mill 3 is provided by preheated air of an air preheater 19, and power is provided by a fan 20;
the coarse coal powder buffer bin 8 is used for feeding the coarse coal powder into a pyrolysis reactor 10 for pyrolysis and then feeding the pyrolysis reactor 10 into a separation system 11 for gas-solid separation, the hot coke powder is fed into a coke powder buffer bin 12, the gas is fed into a tar recovery system 13 for collection to obtain pyrolysis gas 22 and coal tar 23, and part of the pyrolysis gas is fed into a heat exchanger 26 through a first roots blower 7 to exchange heat with high-temperature flue gas 25 and then is fed into the pyrolysis reactor 10;
the fine coal powder buffer bin 9 and the coke powder buffer bin 12 are used for conveying hot coke powder to a primary air box 15 through a high-temperature flue gas 25 subjected to heat exchange and temperature reduction through a heat exchanger 26, the hot coke powder is conveyed to a boiler 18 through a combustor 17 for combustion, secondary air is conveyed to an air preheater 19 through a fan 20 for preheating, the preheated secondary air is conveyed to the boiler through a secondary air box 16 for combustion supporting, and steam heated by the boiler 18 is conveyed to a generator set 21 for power generation;
the system produces pyrolysis gas 22 and coal tar 23, wherein the pyrolysis gas 22 can be used as a heat source to enter the boiler 18 for combustion;
wherein the temperature of the hot coke powder in the coke powder buffer bin 12 is 450-550 ℃, and the temperature of the fine coal powder in the fine coal powder buffer bin 9 is room temperature.
The system of the embodiment can realize cascade utilization of pulverized coal; the sensible heat of the semicoke is fully utilized, and the energy efficiency of the system is improved; coal tar and pyrolysis gas are produced as by-products, and the pyrolysis gas has excellent quality and good economic benefit.
Example 3
As shown in fig. 2, unlike embodiment 1: in this embodiment 3, only one pyrolysis gas is discharged from the pyrolysis gas outlet of the tar recovery system 13, the pyrolysis gas outlet is connected to the pulverized coal outlet of the pulverized coal bunker 9 and the hot coke powder outlet of the coke powder bunker 12 via the first roots blower 7, and the high-temperature flue gas outlet of the boiler 18 is connected to the gas inlet of the pyrolysis reactor 10. The hot air outlet of the air preheater 19 is not connected to the gas inlet of the pyrolysis reactor 10.
Raw coal in a raw coal bin 1 is fed into a mill 3 through a coal feeder 2 and ground, then coarse coal powder is separated through a cyclone separator 4 and enters a coarse coal powder buffer bin 8, fine coal powder is collected by a bag type dust collector 5 and enters a fine coal powder buffer bin 9, tail gas is discharged through a chimney 6, a coal powder drying heat source is provided by preheated air of an air preheater 19, and power is provided by a fan 20;
the coarse coal powder buffer bin 8 feeds the coarse coal powder into a pyrolysis reactor 10 for pyrolysis, then feeds the pyrolysis reactor 10 into a separation system 11 for gas-solid separation, hot coke powder enters a coke powder buffer bin 12, gas enters a tar recovery system 13 for collection to obtain pyrolysis gas and coal tar 23, and high-temperature flue gas 25 in a boiler 18 is fed into the pyrolysis reactor 10;
the fine coal powder buffer bin 9 conveys the fine coal powder and the coke powder buffer bin 12 hot coke powder to a primary air box 15 through a first Roots blower 7 by using pyrolysis gas 22, the primary air box is conveyed to a boiler 18 through a combustor 17 for combustion, secondary air is conveyed to an air preheater 19 through a blower 20 for preheating and then is conveyed to the boiler for combustion supporting through a secondary air box 16, and the boiler 18 heats steam and is conveyed to a generator set 21 for power generation;
wherein the temperature of the hot coke powder in the coke powder buffer bin 12 is 450-550 ℃, and the temperature of the fine coal powder in the fine coal powder buffer bin 9 is room temperature.
The embodiment can realize cascade utilization of pulverized coal; the sensible heat of the semicoke is fully utilized, and the energy efficiency of the system is improved; the coal tar produced by the method has good economic benefit.
Claims (10)
1. The utility model provides a fine coal pyrolysis and coke powder burning electricity generation coupled system which characterized in that includes: the system comprises a raw coal bin (1), a mill (3), a cyclone separator (4), a bag type dust collector (5), a coarse coal powder buffer bin (8), a fine coal powder buffer bin (9), a pyrolysis reactor (10), a separation system (11), a coke powder buffer bin (12), a tar recovery system (13), a boiler (18) and a generator set (21);
a raw coal outlet of the raw coal bin (1) is connected with a raw coal inlet of the mill (3), an outlet of the mill (3) is connected with an inlet of the cyclone separator (4), a coarse coal powder outlet of the cyclone separator (4) is connected with an inlet of the coarse coal powder buffer bin (8), a fine coal powder outlet of the cyclone separator (4) is connected with an inlet of the bag-type dust collector (5), and a fine coal powder outlet of the bag-type dust collector (5) is connected with an inlet of the fine coal powder buffer bin (9);
a coarse coal powder outlet of the coarse coal powder buffer bin (8) is connected with a coarse coal powder inlet of a pyrolysis reactor (10), an outlet of the pyrolysis reactor (10) is connected with an inlet of a separation system (11), a solid outlet of the separation system (11) is connected with an inlet of a coke powder buffer bin (12), and a gas outlet of the separation system (11) is connected with an inlet of a tar recovery system (13);
the fine coal powder outlet of the fine coal powder buffer bin (9) is connected with the hot coke powder outlet of the coke powder buffer bin (12) and the fuel inlet of the boiler (18), and the steam outlet of the boiler (18) is connected with the generator set (21).
2. The pulverized coal pyrolysis and coke powder combustion power generation coupling system according to claim 1, wherein the tar recovery system (13) is provided with a coal tar outlet and a pyrolysis gas outlet, pyrolysis gas at the pyrolysis gas outlet is divided into two streams, one stream of pyrolysis gas is led out, and the other stream of pyrolysis gas enters the pyrolysis reactor (10);
the device is characterized by further comprising an air preheater (19) and a fan (20), wherein an air outlet of the fan (20) is connected with an inlet of the air preheater (19), and hot air of the air preheater (19) is connected with a gas inlet of the pyrolysis reactor (10).
3. The pulverized coal pyrolysis and coke powder combustion power generation coupling system as claimed in claim 2, further comprising a roots blower, wherein an air outlet of the roots blower is connected with a pulverized coal outlet of the pulverized coal buffer bin (9) and a hot coke powder outlet of the coke powder buffer bin (12), and a hot air outlet of the air preheater (19) is further connected with a fuel inlet of the boiler (18).
4. The pulverized coal pyrolysis and coke powder combustion power generation coupling system as claimed in claim 1, further comprising a heat exchanger (26); the tar recovery system (13) is provided with a coal tar outlet and a pyrolysis gas outlet, pyrolysis gas at the pyrolysis gas outlet is divided into two streams, one stream of pyrolysis gas is led out, the other stream of pyrolysis gas enters the heat exchanger (26) from a cold fluid inlet of the heat exchanger (26), and the cold fluid outlet of the heat exchanger (26) is connected with a gas inlet of the pyrolysis reactor (10);
a high-temperature flue gas outlet of the boiler (18) is connected with a hot fluid inlet of a heat exchanger (26), and a hot fluid outlet of the heat exchanger (26) is connected with a fine coal powder outlet of a fine coal powder buffer bin (9) and a hot coke powder outlet of a coke powder buffer bin (12);
still include air heater (19) and fan (20), fan (20) air outlet and air heater (19) entry linkage, air heater (19) hot air outlet and boiler (18) fuel entry linkage.
5. The pulverized coal pyrolysis and coke powder combustion power generation coupling system as claimed in claim 1, wherein the tar recovery system (13) is provided with a coal tar outlet and a pyrolysis gas outlet, and the pyrolysis gas outlet is connected with the pulverized coal outlet of the pulverized coal buffer bin (9) and the hot coke powder outlet of the coke powder buffer bin (12);
still include air heater (19) and fan (20), fan (20) air outlet and air heater (19) entry linkage, air heater (19) hot air outlet and boiler (18) fuel entry linkage.
6. The pulverized coal pyrolysis and coke powder combustion power generation coupling system as claimed in claim 5, wherein the high temperature flue gas outlet of the boiler (18) is connected with the gas inlet of the pyrolysis reactor (10).
7. The pulverized coal pyrolysis and coke powder combustion power generation coupling system as claimed in claim 1, wherein the solid outlet of the separation system (11) is connected with the inlet of the coke powder surge bin (12) through a dry quenching device (24).
8. The pulverized coal pyrolysis and coke powder combustion power generation coupling system as claimed in claim 1, further comprising an air preheater (19) and a fan (20), wherein an air outlet of the fan (20) is connected with an inlet of the air preheater (19), and a hot air outlet of the air preheater (19) is connected with a gas inlet of the mill (3).
9. The pulverized coal pyrolysis and coke powder combustion power generation coupling system as claimed in claim 1, wherein the tail gas outlet of the bag type dust collector (5) is connected with a chimney (6).
10. A power generation method based on coupling of pulverized coal pyrolysis and pulverized coke combustion is characterized in that raw coal is crushed and then separated into coarse pulverized coal and fine pulverized coal through a cyclone separator, the coarse pulverized coal is subjected to pyrolysis reaction, products of the pyrolysis reaction are separated to obtain pyrolysis gas, coal tar and hot pulverized coke, the hot pulverized coke and the fine pulverized coal are sent into a boiler to be combusted, and generated hot steam is sent into a generator set to generate power.
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