CN110776958B - Low-rank coal partition pyrolysis gasification multi-combined supply system and method based on molten bath bed - Google Patents
Low-rank coal partition pyrolysis gasification multi-combined supply system and method based on molten bath bed Download PDFInfo
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
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- C10J2300/00—Details of gasification processes
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- C10J2300/00—Details of gasification processes
- C10J2300/12—Heating the gasifier
- C10J2300/1207—Heating the gasifier using pyrolysis gas as fuel
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Abstract
The invention relates to a low-rank coal partition pyrolysis gasification multi-combined supply system and method based on a molten bath bed, which comprises a molten bath bed partition pyrolysis gasification furnace (1), a spiral stirring propeller (2), a spiral feeder (3), an electrostatic oil fume purifier (4), a centrifugal fan (5), an anti-backfire device (6), an air blower (7), a waste heat boiler (8) and an ash collector (9). Is favorable for energy conservation and consumption reduction.
Description
Technical Field
The invention relates to the technical field of low-rank coal pyrolysis gasification treatment, in particular to a low-rank coal partition pyrolysis gasification multi-combined supply system and method based on a molten bath bed.
Background
Coal pyrolysis and gasification are one of key technologies for coal quality-based utilization, and through decades of development, various coal pyrolysis and gasification technologies emerge endlessly, and through long-term development, a series of mature technologies and processes are formed, and mainly three major types, namely a fixed bed, a fluidized bed and a gas flow bed, are seen. With the continuous development of scientific technology and the continuous improvement of environmental protection requirements, the molten bath bed gasification technology is paid sufficient attention and developed, the molten bath bed coal pyrolysis gasification technology has the characteristics of wide adaptability of coal types, high gasification strength, good pollutant control, lower gasification agent requirement, large gas production and the like, and is superior to other gasification technologies, and the characteristics just meet the requirements of the development trend of clean production and coal gasification of coal, so the development and innovation of the molten bath bed coal pyrolysis gasification equipment have very important and long-term significance for promoting the coordinated development of society, economy and environment.
Disclosure of Invention
The invention aims to provide a low-rank coal partition pyrolysis gasification multi-combined supply system and method based on a molten bath bed, the system and method are novel in structure, practical in function and mature and complete in gasification process method, low-rank coal pyrolysis gasification is realized by using high-temperature and thermally stable molten salt as a catalytic medium and a heat carrier, reaction energy consumption can be reduced, equipment cost and loss can be reduced, meanwhile, harmful gas generated by pyrolysis can be absorbed by the molten salt, environmental pollution is reduced, environmental protection is facilitated, gasification efficiency and gasification purity can be improved by a partition pyrolysis gasification technology, energy can be recycled to the maximum extent by a multi-combined supply technology, and energy saving and consumption reduction are facilitated.
The technical scheme adopted by the invention is as follows: a low-rank coal partition pyrolysis gasification multi-combined supply system based on a molten bath bed comprises a molten bath bed partition pyrolysis gasification furnace 1, a spiral stirring propeller 2, a spiral feeder 3, an electrostatic oil smoke purifier 4, a centrifugal fan 5, an anti-backfire device 6, a blower 7, a waste heat boiler 8 and an ash collector 9, wherein a heat-insulating wall is arranged outside the molten bath bed partition pyrolysis gasification furnace 1, a molten salt mixture is arranged inside the molten bath bed partition pyrolysis gasification furnace 1, a pyrolysis furnace chamber 11, a gasification furnace chamber 12 and a combustion furnace chamber 13 are sequentially arranged inside the molten bath bed partition pyrolysis gasification furnace 1 from front to back in parallel, a separation partition plate 14 is arranged among the pyrolysis furnace chamber 11, the gasification furnace chamber 12 and the combustion furnace chamber 13, the bottoms of the separation partition plate 14 are mutually communicated, the lower end of the separation partition plate 14 is immersed in the molten salt mixture, a feed inlet and a pyrolysis gas outlet are arranged on the pyrolysis furnace, a water vapor inlet and a water gas outlet are arranged on a gasification furnace chamber 12, coke powder is gasified in the gasification furnace chamber 12, a pyrolysis gas return port, an air inlet, a flue gas outlet and an ash residue outlet are arranged on a combustion furnace chamber 13, pyrolysis gas is combusted in the combustion furnace chamber 13, a fused salt mixture is heated, a spiral stirring propeller 2 is arranged in a pyrolysis furnace chamber 11 and is used for stirring, mixing, propelling and circulating low-rank coal particles and the fused salt mixture, a spiral feeder 3 is arranged at the front end of a molten bath bed partition pyrolysis gasification furnace 1, a discharge port of the spiral feeder is communicated with a furnace body feed port on the pyrolysis furnace chamber 11, the spiral feeder 3 is used for feeding the low-rank coal particles into the pyrolysis furnace chamber 11, an air inlet of an electrostatic oil smoke purifier 4 is communicated with the pyrolysis gas outlet on the pyrolysis furnace chamber 11 and is used for separating oil smoke from the pyrolysis gas, an air suction port of a centrifugal, an air outlet of the centrifugal fan 5 is communicated with an air inlet of the anti-backfire device 6 to discharge the pyrolysis gas for backflow conveying, an air outlet of the anti-backfire device 6 is communicated with a pyrolysis gas backflow port on the combustion furnace chamber 13 to control the pyrolysis gas to flow in a single direction and isolate flame propagation, an air outlet of the air blower 7 is communicated with an air inlet on the combustion furnace chamber 13 to input air into the combustion furnace chamber 13, an air inlet pipe of the waste heat boiler 8 is connected with a flue gas outlet on the combustion furnace chamber 13, an air outlet pipe of the waste heat boiler 8 is connected with a water steam inlet on the gasification furnace chamber 12 to produce water steam by using waste heat of flue gas, the ash collector 9 is arranged at the rear end of the molten bath bed partition pyrolysis gasifier 1 and is connected with an ash outlet on the combustion furnace chamber 13 to collect carbon-fixed.
A low-rank coal partition pyrolysis gasification multi-combined supply method based on a molten bath bed comprises the following steps:
feeding low-rank coal particles, uniformly feeding the low-rank coal particles into a pyrolysis furnace chamber 11 by a screw feeder 3 in a fixed-time fixed-quantity and continuous mode, fully and uniformly stirring and mixing the low-rank coal particles and a molten salt mixture in the pyrolysis furnace chamber 11 by a screw stirring propeller 2,
step two, pyrolyzing the low-rank coal, fully pyrolyzing the low-rank coal particles under the catalytic action of the molten salt mixture in the pyrolysis furnace chamber 11 to generate pyrolysis gas and coke powder,
step three, pyrolysis gas treatment and backflow, wherein the pyrolysis gas flows back into a combustion furnace chamber 13 through an electrostatic oil fume purifier 4, a centrifugal fan 5 and an anti-backfire device 6 in sequence under the blowing and sucking action of the centrifugal fan 5,
fourthly, the coke powder is pushed to flow, and enters the gasification furnace chamber 12 along with the flow of the molten salt mixture under the pushing of the spiral stirring propeller 2,
step five, air is fed for combustion and heating, the backflow pyrolysis gas and the air input by the blower 7 are subjected to low-oxygen air combustion in the combustion furnace chamber 13, the generation of NOx is inhibited, toxic gases such as dioxin are burnt out, the molten salt mixture in the combustion furnace chamber 13 is heated,
step six, collecting ash, wherein the ash collector 9 collects carbon solid ash generated by combustion in the combustion furnace chamber 13,
seventhly, recycling waste heat, namely receiving the flue gas generated by combustion in the combustion furnace chamber 13 by the waste heat boiler 9, producing water vapor by using the waste heat of the gas, inputting the water vapor into the gasification furnace chamber 12,
and step eight, gasifying to generate water gas, gasifying the coke powder and the water vapor to generate water gas in the gasification furnace chamber 12, and outputting the water gas through a water gas outlet on the gasification furnace chamber 12.
Compared with the prior art, the invention has the following beneficial effects: novel structure function is practical, and the gasification process method is mature perfect, utilizes high temperature thermal stability's fused salt to realize low order coal pyrolysis gasification as catalytic medium and heat carrier, not only can reduce the reaction energy consumption, can also reduce the cost and the loss of equipment, and the harmful gas that the fused salt can absorb the pyrolysis and produce simultaneously reduces the pollution to the environment, is favorable to the environmental protection, and subregion pyrolysis gasification technique can improve gasification efficiency and gasification pure and clean degree, and the confession technique can furthest cyclic utilization energy more, is favorable to energy saving and consumption reduction.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
As shown in figure 1, the low-rank coal partition pyrolysis gasification multi-combined supply system based on the molten bath bed comprises a molten bath bed partition pyrolysis gasification furnace 1, a spiral stirring propeller 2, a spiral feeder 3, an electrostatic oil fume purifier 4, a centrifugal fan 5, an anti-backfire device 6, an air blower 7, a waste heat boiler 8 and an ash collector 9, wherein a heat insulation wall is arranged outside the molten bath bed partition pyrolysis gasification furnace 1, a molten salt mixture is arranged inside the molten bath bed partition pyrolysis gasification furnace 1, a pyrolysis furnace chamber 11, a gasification furnace chamber 12 and a combustion furnace chamber 13 are sequentially arranged inside the molten bath bed partition pyrolysis gasification furnace 1 from front to back in parallel, a separation partition plate 14 is arranged among the pyrolysis furnace chamber 11, the gasification furnace chamber 12 and the combustion furnace chamber 13, the bottoms of the separation partition plate 14 are communicated with each other, the lower end of the separation partition plate 14 is immersed in the molten salt mixture, a furnace body feed inlet and a pyrolysis gas outlet are, a water vapor inlet and a water gas outlet are arranged on a gasification furnace chamber 12, coke powder is gasified in the gasification furnace chamber 12, a pyrolysis gas return port, an air inlet, a flue gas outlet and an ash residue outlet are arranged on a combustion furnace chamber 13, pyrolysis gas is combusted in the combustion furnace chamber 13, a fused salt mixture is heated, a spiral stirring propeller 2 is arranged in a pyrolysis furnace chamber 11 and is used for stirring, mixing, propelling and circulating low-rank coal particles and the fused salt mixture, a spiral feeder 3 is arranged at the front end of a molten bath bed partition pyrolysis gasification furnace 1, a discharge port of the spiral feeder is communicated with a furnace body feed port on the pyrolysis furnace chamber 11, the spiral feeder 3 is used for feeding the low-rank coal particles into the pyrolysis furnace chamber 11, an air inlet of an electrostatic oil smoke purifier 4 is communicated with the pyrolysis gas outlet on the pyrolysis furnace chamber 11 and is used for separating oil smoke from the pyrolysis gas, an air suction port of a centrifugal, an air outlet of the centrifugal fan 5 is communicated with an air inlet of the anti-backfire device 6 to discharge the pyrolysis gas for backflow conveying, an air outlet of the anti-backfire device 6 is communicated with a pyrolysis gas backflow port on the combustion furnace chamber 13 to control the pyrolysis gas to flow in a single direction and isolate flame propagation, an air outlet of the air blower 7 is communicated with an air inlet on the combustion furnace chamber 13 to input air into the combustion furnace chamber 13, an air inlet pipe of the waste heat boiler 8 is connected with a flue gas outlet on the combustion furnace chamber 13, an air outlet pipe of the waste heat boiler 8 is connected with a water steam inlet on the gasification furnace chamber 12 to produce water steam by using waste heat of flue gas, the ash collector 9 is arranged at the rear end of the molten bath bed partition pyrolysis gasifier 1 and is connected with an ash outlet on the combustion furnace chamber 13 to collect carbon-fixed.
The molten bath bed pyrolysis gasification low order coal mainly utilizes the fused salt of high temperature thermal stability to carry out the subregion pyrolysis gasification as catalytic medium and heat carrier to the low order coal, fused salt has good heat accumulation ability, mass transfer heat transfer coefficient is high, can high efficiency decompose the organic matter, can absorb the harmful gas that the pyrolysis produced simultaneously, reduce the pollution to the environment, be favorable to the environmental protection, pyrolysis gas can regard as energy and synthetic gas to utilize, not only can reduce the reaction energy consumption, can also reduce the cost and the loss of equipment, reduce the pollution to the environment simultaneously.
The pyrolysis gas reflux combustion fundamentally improves the energy utilization rate of the combustion furnace chamber, particularly reasonably utilizes low-calorific-value fuel, reduces the emission of pollutants, saves energy, strengthens the furnace gas circulation in the combustion furnace chamber, homogenizes the temperature field of molten salt, improves the gasification quality, and has very obvious pyrolysis gasification effect on low-rank coal.
The inside of the bath bed zoning pyrolysis gasification furnace 1 is provided with a pyrolysis furnace chamber 11, a gasification furnace chamber 12 and a combustion furnace chamber 13 in parallel from front to back in sequence, a separation baffle plate 14 is arranged among the pyrolysis furnace chamber 11, the gasification furnace chamber 12 and the combustion furnace chamber 13, the bottoms of the separation baffle plates are mutually communicated, and the lower end of the separation baffle plate 14 is immersed in a molten salt mixture.
Pyrolysis gas is used for reflux combustion heating in the combustion furnace chamber 13, the waste heat boiler 8 generates steam by using the waste heat of the flue gas, and the steam is input into the gasification furnace chamber 12, so that the energy is recycled to the maximum extent, and the energy conservation and consumption reduction are facilitated.
A low-rank coal partition pyrolysis gasification multi-combined supply method based on a molten bath bed comprises the following steps:
feeding low-rank coal particles, uniformly feeding the low-rank coal particles into a pyrolysis furnace chamber 11 by a screw feeder 3 in a fixed-time fixed-quantity and continuous mode, fully and uniformly stirring and mixing the low-rank coal particles and a molten salt mixture in the pyrolysis furnace chamber 11 by a screw stirring propeller 2,
step two, pyrolyzing the low-rank coal, fully pyrolyzing the low-rank coal particles under the catalytic action of the molten salt mixture in the pyrolysis furnace chamber 11 to generate pyrolysis gas and coke powder,
step three, pyrolysis gas treatment and backflow, wherein the pyrolysis gas flows back into a combustion furnace chamber 13 through an electrostatic oil fume purifier 4, a centrifugal fan 5 and an anti-backfire device 6 in sequence under the blowing and sucking action of the centrifugal fan 5,
fourthly, the coke powder is pushed to flow, and enters the gasification furnace chamber 12 along with the flow of the molten salt mixture under the pushing of the spiral stirring propeller 2,
step five, air is fed for combustion and heating, the backflow pyrolysis gas and the air input by the blower 7 are subjected to low-oxygen air combustion in the combustion furnace chamber 13, the generation of NOx is inhibited, toxic gases such as dioxin are burnt out, the molten salt mixture in the combustion furnace chamber 13 is heated,
step six, collecting ash, wherein the ash collector 9 collects carbon solid ash generated by combustion in the combustion furnace chamber 13,
seventhly, recycling waste heat, namely receiving the flue gas generated by combustion in the combustion furnace chamber 13 by the waste heat boiler 9, producing water vapor by using the waste heat of the gas, inputting the water vapor into the gasification furnace chamber 12,
and step eight, gasifying to generate water gas, gasifying the coke powder and the water vapor to generate water gas in the gasification furnace chamber 12, and outputting the water gas through a water gas outlet on the gasification furnace chamber 12.
Without being limited thereto, any changes or substitutions that are not thought of through the inventive work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (2)
1. A low-rank coal partition pyrolysis gasification multi-combined supply system based on a molten bath bed is characterized by comprising a molten bath bed partition pyrolysis gasification furnace (1), a spiral stirring propeller (2), a spiral feeder (3), an electrostatic oil fume purifier (4), a centrifugal fan (5), an anti-backfire device (6), a blower (7), a waste heat boiler (8) and an ash collector (9), wherein a heat-insulating wall is arranged outside the molten bath bed partition pyrolysis gasification furnace (1), a molten salt mixture is arranged inside the molten bath bed partition pyrolysis gasification furnace (1), a pyrolysis furnace chamber (11), a gasification furnace chamber (12) and a combustion furnace chamber (13) are sequentially arranged inside the molten bath bed partition pyrolysis gasification furnace (1) from front to back in parallel, separation partition plates (14) are arranged among the pyrolysis furnace chamber (11), the gasification furnace chamber (12) and the combustion furnace chamber (13), the bottoms of the separation partition plates are mutually communicated, and the lower ends of the separation partition plates (, a furnace body feed inlet and a pyrolysis gas outlet are arranged on the pyrolysis furnace chamber (11), pyrolysis treatment is carried out on low-rank coal particles in the pyrolysis furnace chamber (11), a water vapor inlet and a water gas outlet are arranged on the gasification furnace chamber (12), the coke powder is gasified in the gasification furnace chamber (12), a pyrolysis gas return port, an air inlet, a flue gas outlet and an ash residue outlet are arranged on the combustion furnace chamber (13), pyrolysis gas is combusted in the combustion furnace chamber (13), a fused salt mixture is heated, a spiral stirring propeller (2) is arranged in the pyrolysis furnace chamber (11), stirring, mixing, propelling and circulating are carried out on the low-rank coal particles and the fused salt mixture, a spiral feeder (3) is arranged at the front end of the melting bath bed partition pyrolysis gasifier (1), a discharge port of the spiral stirring propeller is communicated with the furnace body feed inlet on the pyrolysis furnace chamber (11), and the spiral feeder (3) feeds the low-rank coal particles into the pyrolysis, an air inlet of the electrostatic oil fume purifier (4) is communicated with a pyrolysis gas outlet on a pyrolysis furnace chamber (11) to carry out oil fume separation treatment on pyrolysis gas, an air suction opening of a centrifugal fan (5) is communicated with an air outlet of the electrostatic oil fume purifier (4), an air outlet of the centrifugal fan (5) is communicated with an air inlet of an anti-backfire device (6) to discharge, reflux and convey the pyrolysis gas, an air outlet of the anti-backfire device (6) is communicated with a pyrolysis gas backflow opening on a combustion furnace chamber (13) to control the unidirectional flow of the pyrolysis gas and isolate flame propagation, an air outlet of a blower (7) is communicated with an air inlet on the combustion furnace chamber (13) to carry out air input on the combustion furnace chamber (13), an air inlet pipe of a waste heat boiler (8) is connected with a flue gas outlet on the combustion furnace chamber (13), an air outlet pipe of the waste heat boiler (8) is connected with a water vapor inlet, the water vapor is produced by utilizing the waste heat of the flue gas, and the ash collector (9) is arranged at the rear end of the melting bath bed partition pyrolysis gasification furnace (1) and is connected with an ash outlet on the combustion furnace chamber (13) to collect carbon solid ash generated in the combustion furnace chamber (13).
2. A low-rank coal partition pyrolysis gasification multi-combined supply method based on a molten bath bed is characterized by comprising the following steps:
feeding low-rank coal particles, uniformly feeding the low-rank coal particles into a pyrolysis furnace chamber (11) by a screw feeder (3) in a timed, quantitative and continuous mode, fully and uniformly stirring and mixing the low-rank coal particles and a molten salt mixture in the pyrolysis furnace chamber (11) by a screw stirring propeller (2),
step two, pyrolyzing the low-rank coal, fully pyrolyzing the low-rank coal particles under the catalytic action of a molten salt mixture in a pyrolysis furnace chamber (11) to generate pyrolysis gas and coke powder,
thirdly, pyrolysis gas is treated and reflows, the pyrolysis gas sequentially passes through the electrostatic oil fume purifier (4), the centrifugal fan (5) and the anti-backfire device (6) under the blowing and sucking action of the centrifugal fan (5) and flows back into the combustion furnace chamber (13),
fourthly, the coke powder is pushed to flow, and enters a gasification furnace chamber (12) along with the flow of the molten salt mixture under the pushing of a spiral stirring propeller (2),
step five, air is fed for combustion and heating, the backflow pyrolysis gas and the air input by the blower (7) are subjected to low-oxygen air combustion in a combustion furnace chamber (13), the generation of NOx is inhibited, dioxin is burnt out, and the molten salt mixture in the combustion furnace chamber (13) is heated,
sixthly, collecting ash, wherein the ash collector (9) collects carbon solid ash generated by combustion in the combustion furnace chamber (13),
seventhly, waste heat is recycled, the waste heat boiler (9) receives flue gas generated by combustion in the combustion furnace chamber (13), water vapor is produced by utilizing gas waste heat, the water vapor is input into the gasification furnace chamber (12),
and step eight, gasifying to generate water gas, gasifying the coke powder and the water vapor in the gasification furnace chamber (12) to generate water gas, and outputting the water gas through a water gas outlet on the gasification furnace chamber (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911179098.0A CN110776958B (en) | 2019-11-20 | 2019-11-20 | Low-rank coal partition pyrolysis gasification multi-combined supply system and method based on molten bath bed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911179098.0A CN110776958B (en) | 2019-11-20 | 2019-11-20 | Low-rank coal partition pyrolysis gasification multi-combined supply system and method based on molten bath bed |
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