CN112391208A - Gasification furnace fly ash recycling system capable of recycling coal gas and working method thereof - Google Patents
Gasification furnace fly ash recycling system capable of recycling coal gas and working method thereof Download PDFInfo
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- CN112391208A CN112391208A CN202011419079.3A CN202011419079A CN112391208A CN 112391208 A CN112391208 A CN 112391208A CN 202011419079 A CN202011419079 A CN 202011419079A CN 112391208 A CN112391208 A CN 112391208A
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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
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
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- C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
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Abstract
The invention discloses a gasification furnace fly ash recirculation system capable of recycling coal gas and a working method thereof, and belongs to the technical field of gasification furnaces. The fly ash lock hopper is connected with the fly ash gas stripping tank, the fly ash lock hopper and the fly ash gas stripping tank are respectively connected with the first exhaust filter, the fly ash gas stripping tank is connected with the fly ash accelerating unit, and the fly ash accelerating unit is connected with the pulverized coal conveying unit; the first exhaust filter is connected with the desulfurization unit, the desulfurization unit is connected with the hot blast stove unit, the hot blast stove unit is connected with the coal grinding drying device, the coal grinding drying device is connected with the second exhaust filter, and the second exhaust filter is respectively connected with the coal powder conveying unit and the hot blast stove unit; the pulverized coal conveying unit is connected with a burner of the gasification furnace. The system can make full use of the fly ash carbon residue and the carried coal gas, improves the utilization rate of energy, and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of gasification furnaces, and particularly relates to a gasification furnace fly ash recirculation system capable of recycling coal gas and a working method thereof.
Background
The coal gasification technology is a core technology for clean and efficient utilization of coal, is a key technology for developing advanced clean coal power generation, coal chemical industry, coal-based poly-generation and other energy systems, and has important influence on the operation reliability and economy of each system. Driven by the rapid development of modern coal chemical engineering projects, coal gasification technology is developing towards large-scale, clean, efficient and wide coal adaptability. The development of coal gasification technology presents a lot of flowers, but in the development process of the high-efficiency clean coal gasification technology at the present stage, a plurality of problems still exist and need to be solved.
In the existing gasification furnace system, coal gas in fly ash is replaced, the fly ash is removed from the air, and the coal gas is removed to a torch. By adopting the measure, on one hand, the fly ash with higher carbon residue content is directly sent out, so that the energy is wasted; on the other hand, the gas carried in the fly ash can not be effectively utilized, and the low-grade gas is burnt by the torch, and the low-grade gas needs to be burnt by the burner, so that the fly ash carbon residue can be wasted due to extra energy, and the gas carried in the fly ash can not be effectively utilized, thereby causing the waste of energy.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a fly ash recycling system of a gasification furnace capable of recycling gas and a method for operating the same, which can fully utilize residual carbon in fly ash and carried gas and improve the utilization rate of energy.
The invention is realized by the following technical scheme:
the invention discloses a gasification furnace fly ash recycling system capable of recycling coal gas, which comprises a coal gas ash remover, a fly ash storage tank, a fly ash lock hopper, a fly ash gas stripping tank, a first exhaust filter, a desulfurization unit, a hot blast stove unit, a fly ash acceleration unit, a coal grinding drying device, a second exhaust filter and a coal powder conveying unit, wherein the first exhaust filter is arranged on the fly ash storage tank;
the inlet of the gas ash remover is connected with the waste pot outlet of the gasification furnace, the bottom outlet of the gas ash remover is connected with the fly ash storage tank, the fly ash storage tank is connected with a stamping nitrogen gas inlet pipe, the fly ash storage tank is connected with a fly ash lock hopper, the fly ash lock hopper is connected with a high-pressure nitrogen gas inlet pipe, the fly ash lock hopper is connected with a fly ash gas stripping tank, the fly ash gas stripping tank is connected with a low-pressure nitrogen gas inlet pipe, the fly ash lock hopper and the fly ash gas stripping tank are respectively connected to a first exhaust filter, the fly ash gas stripping tank is connected with a fly ash accelerating;
the first exhaust filter is connected with the desulfurization unit, the desulfurization unit is connected with the hot blast stove unit, the hot blast stove unit is connected with the coal grinding drying device, the coal grinding drying device is connected with the second exhaust filter, and the second exhaust filter is respectively connected with the coal powder conveying unit and the hot blast stove unit; the pulverized coal conveying unit is connected with a burner of the gasification furnace.
Preferably, the hot blast stove unit comprises a hot blast stove and a hot blast stove circulating fan, the desulfurization unit is connected with a fuel inlet of the hot blast stove, a hot air outlet of the hot blast stove is connected with the coal grinding and drying device, the coal grinding and drying device is connected with the second exhaust filter, a gas outlet of the second exhaust filter is connected with the hot blast stove circulating fan, and the hot blast stove circulating fan is connected with an air inlet of the hot blast stove.
Preferably, the pulverized coal conveying unit comprises a pulverized coal conveying normal-pressure tank, a pulverized coal conveying variable-pressure tank and a pulverized coal conveying high-pressure tank; the inlet of the pulverized coal conveying normal pressure tank is connected with the fly ash accelerating unit and the second exhaust filter respectively, the outlet of the pulverized coal conveying normal pressure tank is connected with the pulverized coal conveying variable pressure tank, the pulverized coal conveying variable pressure tank is connected with a stamping nitrogen gas inlet pipe, the pulverized coal conveying variable pressure tank is connected with the pulverized coal conveying high pressure tank, the pulverized coal conveying high pressure tank is connected with a burner of the gasification furnace, and the pulverized coal conveying high pressure tank is connected with a high-pressure nitrogen gas inlet pipe.
Further preferably, valves are arranged on a connecting pipeline between the fly ash acceleration unit and the pulverized coal conveying normal pressure tank and a connecting pipeline between the second exhaust filter and the pulverized coal conveying normal pressure tank.
Further preferably, valves on a connecting pipeline between the fly ash acceleration unit and the pulverized coal conveying normal pressure tank and a connecting pipeline between the second exhaust filter and the pulverized coal conveying normal pressure tank are connected with a bridging blockage prevention device.
Preferably, the fly ash acceleration unit comprises a fly ash buffer tank and a pressurized nitrogen system, the fly ash buffer tank is connected with the pressurized nitrogen system, a connection pipeline of the fly ash buffer tank and the pressurized nitrogen system is provided with an adjusting valve, an inlet of the fly ash buffer tank is connected with the fly ash gas stripping tank, and an outlet of the fly ash buffer tank is connected with the pulverized coal conveying unit.
Further preferably, the fly ash buffer tank is connected with a fly ash carbon residue on-line detection device, the fly ash carbon residue on-line detection device is connected with a controller, an outlet of the fly ash buffer tank is connected with two branches, one branch is connected with the pulverized coal conveying unit, the other branch is connected with the fly ash bin, valves are arranged on the two branches, and the two valves are respectively connected with the controller.
Preferably, the first exhaust filter is connected with a back-blown nitrogen buffer tank.
Preferably, the coal gas ash remover adopts a cyclone separator, so that the separation efficiency is high, and the control and the maintenance are simple.
The invention discloses a working method of the gasification furnace fly ash recycling system capable of recycling coal gas, which comprises the following steps:
the ash-containing synthetic gas enters a gas ash remover from a waste boiler outlet of a gasification furnace and is separated by the gas ash remover, the clean synthetic gas is discharged from an upper outlet of the gas ash remover, the fly ash enters a fly ash storage tank from a bottom outlet of the gas ash remover, the fly ash sequentially enters a fly ash lock hopper and a fly ash gas-lifting tank under the action of stamping nitrogen, the gas carried in the fly ash is replaced and enters a first gas-discharging filter under the action of high-pressure nitrogen and low-pressure nitrogen, and the particles obtained by filtering return to the fly ash gas-lifting tank and are accelerated by a fly ash accelerating unit together with the fly ash and then enter a pulverized coal conveying unit;
the filtered coal gas enters a desulfurization unit for desulfurization and then enters a hot blast stove unit for combustion as fuel, hot air produced by the hot blast stove unit enters a coal grinding drying device as dry air, coal powder enters a second exhaust filter from the coal grinding drying device, gas discharged by the second exhaust filter enters the hot blast stove unit for heating, and the coal powder enters a coal powder conveying unit and is mixed with fly ash and then enters a hearth of a gasification furnace from a nozzle of the gasification furnace.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a gasification furnace fly ash recycling system capable of recycling gas, wherein ash-containing synthesis gas is separated and treated by a gas ash remover from a waste boiler outlet of a gasification furnace, then sequentially enters a fly ash storage tank, a fly ash lock hopper and a fly ash gas stripping tank, the gas carried in the fly ash is replaced, and the gas is filtered and desulfurized and then enters a hot blast stove unit to be burnt as fuel, so that the energy is recycled, and the purpose of saving energy is achieved. The gas discharged by the second exhaust gas filter is also fully utilized as the inlet air of the hot blast stove unit. The fly ash and the coal powder enter the coal powder conveying unit together, and finally enter a hearth of the gasification furnace through a burner of the gasification furnace to perform combustion circulation again. In addition, the replaced coal gas is used for removing the hot air furnace, the energy consumption of the flame-removing torch burner for burning is saved, and the load of the torch is reduced. The gasifier has reasonable structural design, makes full use of the residual carbon in the fly ash and the coal gas carried in the fly ash, and improves the overall efficiency of the gasifier and the comprehensive utilization rate of energy.
Furthermore, the fly ash from the fly ash accelerating unit enters the pulverized coal conveying normal pressure tank, and a fly ash silo does not need to be arranged independently, so that the system is simplified, and the design, manufacturing and maintenance costs are reduced.
Furthermore, valves are arranged on a connecting pipeline between the fly ash acceleration unit and the coal powder conveying normal pressure tank and a connecting pipeline between the second exhaust filter and the coal powder conveying normal pressure tank, the control system can control the coal powder and the fly ash to intermittently enter the coal powder conveying normal pressure tank, and the automation degree is high.
Furthermore, the bridging and blocking prevention device can prevent fly ash and coal powder from blocking the valve, and the safety and the stability of the system are improved.
Further, the fly ash in the fly ash buffer tank is conveyed through the pressurized nitrogen system, the regulating valve regulates the conveying pressure in real time according to the working condition of the system, the efficiency is improved, and meanwhile the stability of the system is guaranteed.
Furthermore, the residual carbon amount of the fly ash can be detected in real time through the fly ash residual carbon online detection device, when the fly ash residual carbon is high, the fly ash is controlled to enter the pulverized coal conveying unit through the valve, and then the fly ash is combusted and reused; when the carbon residue of fly ash is low, the fly ash is controlled by a valve to enter the fly ash bin to be discharged out of the system as a byproduct. The overall efficiency of the gasification rate is ensured while the energy is reasonably utilized.
Furthermore, the first exhaust filter is connected with a back-blowing nitrogen buffer tank, so that blockage is prevented, and the safety and the stability of the system are improved.
The working method of the gasifier fly ash recycling system capable of recycling the coal gas disclosed by the invention can fully utilize the fly ash carbon residue and the carried coal gas, improve the utilization rate of energy and has good application prospect.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: the device comprises a gas ash remover 1, a fly ash storage tank 2, a fly ash lock hopper 3, a fly ash gas stripping tank 4, a first exhaust filter 5, a desulfurization unit 6, a fly ash acceleration unit 7, a coal grinding drying device 8, a second exhaust filter 9, a hot-blast stove 10, a hot-blast stove circulating fan 11, a coal powder conveying normal-pressure tank 12, a coal powder conveying pressure-changing tank 13, a coal powder conveying high-pressure tank 14 and a nitrogen back-blowing buffer tank 15.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, which are included to illustrate and not to limit the invention:
referring to fig. 1, the fly ash recycling system of a gasification furnace capable of recycling gas according to the present invention includes a gas ash remover 1, a fly ash storage tank 2, a fly ash lock hopper 3, a fly ash stripping tank 4, a first exhaust filter 5, a desulfurization unit 6, a hot blast stove unit, a fly ash acceleration unit 7, a coal grinding and drying device 8, a second exhaust filter 9, and a pulverized coal conveying unit. The coal gas ash remover 1 preferably adopts a cyclone separator.
The inlet of a gas ash remover 1 is connected with the waste boiler outlet of a gasification furnace, the bottom outlet of the gas ash remover 1 is connected with a fly ash storage tank 2, the fly ash storage tank 2 is connected with a stamping nitrogen gas inlet pipe, the fly ash storage tank 2 is connected with a fly ash lock bucket 3, the fly ash lock bucket 3 is connected with a high-pressure nitrogen gas inlet pipe, the fly ash lock bucket 3 is connected with a fly ash gas stripping tank 4, the fly ash gas stripping tank 4 is connected with a low-pressure nitrogen gas inlet pipe, the fly ash lock bucket 3 and the fly ash gas stripping tank 4 are respectively connected to a first exhaust filter 5, and the first exhaust filter 5 is connected with; the fly ash gas stripping tank 4 is connected with a fly ash accelerating unit 7, and the fly ash accelerating unit 7 is connected with a coal powder conveying unit;
The fly ash acceleration unit 7 comprises a fly ash buffer tank and a pressurized nitrogen system, the fly ash buffer tank is connected with the pressurized nitrogen system, a regulating valve is arranged on a connecting pipeline of the fly ash buffer tank and the pressurized nitrogen system, the inlet of the fly ash buffer tank is connected with the fly ash gas stripping tank 4, and the outlet of the fly ash buffer tank is connected with the pulverized coal conveying unit. The fly ash buffer tank is connected with a fly ash residual carbon online detection device, the fly ash residual carbon online detection device is connected with a controller, an outlet of the fly ash buffer tank is connected with two branches, one branch is connected with the pulverized coal conveying unit, the other branch is connected with the fly ash bin, valves are arranged on the two branches, and the two valves are respectively connected with the controller.
The working method of the gasifier fly ash recycling system capable of recycling coal gas comprises the following steps:
the ash-containing synthetic gas enters a gas ash remover 1 from a waste boiler outlet of a gasification furnace and is separated by a gas ash remover 2, the clean synthetic gas is discharged from an upper outlet of the gas ash remover 1, the fly ash enters a fly ash storage tank 2 from a bottom outlet of the gas ash remover 1, the fly ash sequentially enters a fly ash lock bucket 3 and a fly ash gas-stripping tank 4 under the action of stamping nitrogen, the gas carried in the fly ash is replaced and enters a first gas-discharging filter 5 under the action of high-pressure nitrogen and low-pressure nitrogen, a back-blowing nitrogen buffer tank 15 periodically purges the first gas-discharging filter 5, and the particles obtained by filtration return to the fly ash gas-stripping tank 4 and enter a fly ash buffer tank of a fly ash acceleration unit 7 together with the fly ash, and enter a coal powder conveying normal-pressure tank 12 after being accelerated by a pressurized nitrogen system;
filtered coal gas enters a desulfurization unit 6 for desulfurization and then enters a hot blast stove 10 for fuel combustion, hot air produced by the hot blast stove 10 enters a coal grinding drying device 8 as dry air, coal powder enters a second exhaust filter 9 from the coal grinding drying device 8, gas discharged from the second exhaust filter 9 enters the hot blast stove 10 for heating through a hot blast stove circulating fan 11, and the coal powder enters a coal powder conveying normal pressure tank 12 to be mixed with fly ash and then enters a hearth of a gasification furnace through a nozzle of the gasification furnace. The residual carbon amount of the fly ash can be detected in real time through the fly ash residual carbon online detection device, when the fly ash residual carbon is high, the fly ash is controlled to enter the pulverized coal conveying unit through the valve, and then the fly ash is combusted and recycled; when the carbon residue of fly ash is low, the fly ash is controlled by a valve to enter the fly ash bin to be discharged out of the system as a byproduct.
The above description is only a part of the embodiments of the present invention, and although some terms are used in the present invention, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention and are to be construed as any additional limitation which is not in accordance with the spirit of the invention. The foregoing is merely an illustration of the present invention for the purpose of providing an easy understanding and is not intended to limit the present invention to the particular embodiments disclosed herein, and any technical extensions or innovations made herein are protected by the present invention.
Claims (10)
1. A gasification furnace fly ash recycling system capable of recycling coal gas is characterized by comprising a coal gas ash remover (1), a fly ash storage tank (2), a fly ash lock hopper (3), a fly ash gas stripping tank (4), a first exhaust filter (5), a desulfurization unit (6), a hot blast stove unit, a fly ash acceleration unit (7), a coal grinding drying device (8), a second exhaust filter (9) and a coal powder conveying unit;
the inlet of a gas ash remover (1) is connected with the waste boiler outlet of a gasification furnace, the bottom outlet of the gas ash remover (1) is connected with a fly ash storage tank (2), the fly ash storage tank (2) is connected with a stamping nitrogen gas inlet pipe, the fly ash storage tank (2) is connected with a fly ash lock hopper (3), the fly ash lock hopper (3) is connected with a high-pressure nitrogen gas inlet pipe, the fly ash lock hopper (3) is connected with a fly ash gas stripping tank (4), the fly ash gas stripping tank (4) is connected with a low-pressure nitrogen gas inlet pipe, the fly ash lock hopper (3) and the fly ash gas stripping tank (4) are respectively connected to a first exhaust filter (5), the fly ash gas stripping tank (4) is connected with a fly ash accelerating unit (7), and the fly ash accelerating;
the first exhaust filter (5) is connected with the desulfurization unit (6), the desulfurization unit (6) is connected with the hot blast stove unit, the hot blast stove unit is connected with the coal grinding drying device (8), the coal grinding drying device (8) is connected with the second exhaust filter (9), and the second exhaust filter (9) is respectively connected with the coal powder conveying unit and the hot blast stove unit; the pulverized coal conveying unit is connected with a burner of the gasification furnace.
2. The gasification furnace fly ash recycling system capable of recycling gas as claimed in claim 1, wherein the hot blast furnace unit comprises a hot blast furnace (10) and a hot blast furnace circulating fan (11), the desulfurization unit (6) is connected with a fuel inlet of the hot blast furnace (10), a hot air outlet of the hot blast furnace (10) is connected with the coal grinding and drying device (8), the coal grinding and drying device (8) is connected with the second exhaust filter (9), a gas outlet of the second exhaust filter (9) is connected with the hot blast furnace circulating fan (11), and the hot blast furnace circulating fan (11) is connected with an air inlet of the hot blast furnace (10).
3. The gasifier fly ash recirculation system capable of recycling gas according to claim 1, wherein the pulverized coal conveying unit comprises a pulverized coal conveying atmospheric tank (12), a pulverized coal conveying pressure swing tank (13) and a pulverized coal conveying high pressure tank (14); the inlet of a pulverized coal conveying normal pressure tank (12) is respectively connected with a fly ash accelerating unit (7) and a second exhaust filter (9), the outlet of the pulverized coal conveying normal pressure tank (12) is connected with a pulverized coal conveying variable pressure tank (13), the pulverized coal conveying variable pressure tank (13) is connected with a stamping nitrogen gas inlet pipe, the pulverized coal conveying variable pressure tank (13) is connected with a pulverized coal conveying high pressure tank (14), the pulverized coal conveying high pressure tank (14) is connected with a burner of a gasification furnace, and the pulverized coal conveying high pressure tank (14) is connected with a high pressure nitrogen gas inlet pipe.
4. The gasifier fly ash recirculation system capable of recycling gas according to claim 3, wherein a valve is disposed on a connecting pipeline between the fly ash acceleration unit (7) and the pulverized coal transportation atmospheric tank (12) and a connecting pipeline between the second exhaust filter (9) and the pulverized coal transportation atmospheric tank (12).
5. The gasifier fly ash recirculation system capable of recycling gas according to claim 4, wherein valves on the connecting pipeline between the fly ash acceleration unit (7) and the pulverized coal transportation atmospheric tank (12) and the connecting pipeline between the second exhaust filter (9) and the pulverized coal transportation atmospheric tank (12) are connected with a bridging blockage prevention device.
6. The gasifier fly ash recycling system capable of recycling gas according to claim 1, wherein the fly ash acceleration unit (7) comprises a fly ash buffer tank and a pressurized nitrogen system, the fly ash buffer tank is connected with the pressurized nitrogen system, a connection pipeline of the fly ash buffer tank and the pressurized nitrogen system is provided with a regulating valve, an inlet of the fly ash buffer tank is connected with the fly ash stripping tank (4), and an outlet of the fly ash buffer tank is connected with the pulverized coal conveying unit.
7. The gasifier fly ash recycling system capable of recycling gas as claimed in claim 6, wherein the fly ash buffer tank is connected to an online detection device for fly ash carbon residue, the online detection device for fly ash carbon residue is connected to the controller, the outlet of the fly ash buffer tank is connected to two branches, one branch is connected to the pulverized coal conveying unit, the other branch is connected to the fly ash bin, and both branches are provided with valves, and the two valves are respectively connected to the controller.
8. The gasifier fly ash recirculation system capable of recovering gas according to claim 1, wherein a back-blown nitrogen buffer tank (15) is connected to the first exhaust filter (5).
9. The gasifier fly ash recirculation system capable of recovering gas as claimed in claim 1, wherein the gas ash remover (1) is a cyclone separator.
10. The method of operating a gasifier fly ash recirculation system capable of recovering gas as claimed in any one of claims 1 to 9, comprising:
the ash-containing synthetic gas enters a gas ash remover (1) from a waste boiler outlet of a gasification furnace and is separated by a gas ash remover (2), the clean synthetic gas is discharged from an upper outlet of the gas ash remover (1), the fly ash enters a fly ash storage tank (2) from a bottom outlet of the gas ash remover (1), the fly ash sequentially enters a fly ash lock hopper (3) and a fly ash gas-stripping tank (4) under the action of stamping nitrogen, the gas carried in the fly ash is replaced to enter a first gas-discharging filter (5) under the action of high-pressure nitrogen and low-pressure nitrogen, and particles obtained by filtering return to the fly ash gas-stripping tank (4) and enter a pulverized coal conveying unit together with the fly ash after being accelerated by a fly ash accelerating unit (7);
filtered coal gas enters a desulfurization unit (6) for desulfurization and then enters a hot blast furnace unit to be burnt as fuel, hot air produced by the hot blast furnace unit enters a coal grinding drying device (8) as dry air, coal powder enters a second exhaust filter (9) from the coal grinding drying device (8), gas discharged by the second exhaust filter (9) enters the hot blast furnace unit for heating, and the coal powder enters a coal powder conveying unit to be mixed with fly ash and then enters a hearth of a gasification furnace through a burner of the gasification furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011419079.3A CN112391208A (en) | 2020-12-07 | 2020-12-07 | Gasification furnace fly ash recycling system capable of recycling coal gas and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011419079.3A CN112391208A (en) | 2020-12-07 | 2020-12-07 | Gasification furnace fly ash recycling system capable of recycling coal gas and working method thereof |
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| CN112391208A true CN112391208A (en) | 2021-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011419079.3A Pending CN112391208A (en) | 2020-12-07 | 2020-12-07 | Gasification furnace fly ash recycling system capable of recycling coal gas and working method thereof |
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| CN (1) | CN112391208A (en) |
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2020
- 2020-12-07 CN CN202011419079.3A patent/CN112391208A/en active Pending
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