CN212532882U - Indirect cooling type moving bed non-slag pure oxygen continuous gasification device - Google Patents
Indirect cooling type moving bed non-slag pure oxygen continuous gasification device Download PDFInfo
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- CN212532882U CN212532882U CN202020702551.3U CN202020702551U CN212532882U CN 212532882 U CN212532882 U CN 212532882U CN 202020702551 U CN202020702551 U CN 202020702551U CN 212532882 U CN212532882 U CN 212532882U
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Abstract
The utility model discloses an indirect cooling type moving bed non-slag pure oxygen continuous gasification device, which comprises a gasification device, a dust removal device, a waste heat recovery device and a cold treatment device; the gasification equipment comprises a gasification furnace, the dust removal equipment comprises a cyclone dust collector and a high-temperature bag dust collector, the waste heat recovery equipment comprises a waste heat recoverer, and the cold treatment equipment comprises an intercooler; the optimized arrangement of the gasification furnace can further improve the gasification efficiency of the utility model and reduce the carbon residue of the ash residue of the utility model; the arrangement of the dust removal equipment is convenient for thoroughly removing dust carried in the coal gas output from the gasification furnace, the service life of the waste heat recoverer is prolonged, the waste of water resources caused by washing and dust removal is avoided, and meanwhile, secondary pollution is avoided; the indirect cooler replaces a conventional water washing tower, so that non-contact indirect heat exchange of coal gas can be realized, the problems of treatment and discharge of washing coal gas wastewater are solved, and zero discharge of the coal gas wastewater is realized.
Description
Technical Field
The utility model relates to a coal gasification technical field especially relates to a non-slag pure oxygen continuous gasification equipment of indirect cooling formula removal bed.
Background
At present, with the vigorous development of the coal chemical industry, higher and higher requirements are put forward on indexes of gasification strength, gasification efficiency, coal type adaptability, operation continuity, environmental friendliness and the like of a coal gasification technology. Most of the existing coal chemical industry enterprises and ceramic, glass and smelting enterprises still have the problems of incomplete pollution treatment, low treatment efficiency and the like, and the problems are particularly serious in the waste gas treatment process, wherein for dust removal operation, the existing enterprises mostly adopt wet washing dust removal, a large amount of sediments are generated by the wet washing dust removal, and the improper treatment of the sediments can cause pollution of water resources on one hand, waste of the water resources on the other hand and aggravation of the pollution damage degree of the environment; in addition, in cold areas, the wet type washing dust removal also needs to take anti-freezing measures so as not to influence normal work, and the work load is increased; the direct washing heat exchange is adopted for more heat exchange equipment in the existing waste gas treatment process, so that the discharge of waste water is increased, the hidden danger of secondary pollution to the environment is generated, and the treatment effect and the treatment efficiency of coal gas are seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a non-slag pure oxygen continuous gasification equipment of indirect cooling formula moving bed can promote the gasification effect, improves gasification efficiency to realize saving, high efficiency, no waste water discharge's purpose in the processing procedure.
The utility model adopts the following technical scheme:
an indirect cooling type moving bed non-slag pure oxygen continuous gasification device and a process thereof, which comprises gasification equipment, dust removal equipment, waste heat recovery equipment and cold treatment equipment;
the gasification equipment comprises a gasification furnace, the top of the gasification furnace is provided with a raw material coal hopper, the bottom of the gasification furnace is provided with a gasification agent inlet, the gasification furnace is provided with a coal gas outlet, and the coal gas outlet is connected with the dust removal equipment through a connecting pipeline;
the dust removing equipment comprises a cyclone dust remover and a high-temperature cloth bag dust remover, wherein a coal gas inlet and a coal gas outlet are arranged on the cyclone dust remover and the high-temperature cloth bag dust remover; the gas inlet of the cyclone dust collector is connected with the gas outlet of the gasification furnace through a connecting pipeline, and the gas outlet of the cyclone dust collector is connected with the gas inlet of the high-temperature bag-type dust collector through a connecting pipeline; the high-temperature bag-type dust collector is also provided with a gas back-blowing port, and the lower end of the high-temperature bag-type dust collector is provided with a dust outlet; a coal gas outlet of the high-temperature bag-type dust collector is connected with a waste heat recovery device through a connecting pipeline;
the waste heat recovery device comprises a waste heat recoverer, a coal gas inlet and a coal gas outlet are arranged on the waste heat recoverer, the coal gas inlet of the waste heat recoverer is connected with the coal gas outlet of the high-temperature bag type dust collector through a connecting pipeline, and the coal gas outlet of the waste heat recoverer is connected with the cold treatment device through a connecting pipeline;
the cold treatment equipment comprises an intercooler, wherein an intercooler coal gas inlet, an intercooler coal gas outlet, an intercooler water inlet and an intercooler water outlet are arranged on the intercooler; the indirect cooler coal gas inlet is connected with the coal gas outlet of the waste heat recoverer through a connecting pipeline, and the indirect cooler coal gas outlet is connected with the product coal gas connecting pipe network through a connecting pipeline.
The gasifier barrel is of a water-cooled wall structure in the whole section, the water-cooled wall is divided into an upper section and a lower section, the upper section is a low-pressure section, the lower section is a medium-pressure section, the upper section water-cooled wall is connected with a first low-pressure steam drum through a connecting pipeline, and the lower section water-cooled wall is connected with the first medium-pressure steam drum through a connecting pipeline.
The top of the gasification furnace is provided with an automatic coke feeder, and a raw material coal hopper is arranged on the automatic coke feeder; the bottom end of the gasification furnace is provided with a forced deslagging device which is arranged around the bottom end of the gasification furnace and has a four-ash bucket or six-ash bucket structure.
The inside 7 to 15 layers of polygonal grates that are provided with of gasifier and optimize the height-diameter ratio of gasifier, the height-diameter ratio of gasifier optimization is 2 to 5.
The bottom end of the cyclone dust collector is provided with a small ash bin, and the gas selected during the gas back blowing of the high-temperature bag-type dust collector is nitrogen or carbon dioxide.
The waste heat recoverer is internally provided with a medium-pressure evaporation section, a low-pressure overheating section, a low-pressure evaporation section and a soft water preheating section from top to bottom in sequence.
A high-temperature coal gas cooler is arranged between the cyclone dust collector and the high-temperature bag type dust collector, and a low-pressure overheating section, a low-pressure evaporation section and a soft water preheating section are sequentially arranged in the waste heat recoverer from top to bottom.
The intercooler inside be provided with the heat exchange tube, and the heat exchange tube adopts vertical distribution.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model relates to an indirect cooling formula removes continuous gasification equipment of non-slag pure oxygen can make through the setting that optimizes and the grate to the height-to-diameter ratio of gasifier the utility model discloses a gasification efficiency obtains further promotion, reduces the utility model discloses the ash residue carbon content promotes the utility model discloses an operating efficiency, the smooth discharge of the gasification ash residue in the gasifier can be guaranteed in the setting of sediment device is forced to the gasifier bottom, the continuous, stable operation of guarantee gasifier.
Furthermore, the arrangement of the dust removal equipment is convenient for thoroughly removing dust carried in the coal gas output from the gasification furnace, the service life of the waste heat recoverer is prolonged, the waste of water resources caused by washing and dust removal is avoided, and meanwhile, secondary pollution is avoided; the arrangement of the small ash bin at the bottom end of the cyclone dust collector in the dust removing equipment can realize unattended automatic operation, and the operation is safe and rapid.
Furthermore, the waste heat recoverer is arranged to achieve the maximization of waste heat recovery, saturated steam and superheated steam with different pressure levels can be produced secondarily, and gradient recovery of heat energy is achieved.
Further, indirect heat transfer of non-contact of coal gas can be realized to the substitution of intercooler to conventional scrubbing tower, has solved the difficult problem that washing coal gas waste water VOCs unorganized emission, has realized the zero release of coal gas waste water, strengthens the utility model discloses a gasification effect promotes gasification efficiency, has strengthened simultaneously the utility model discloses an environmental protection performance.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of the present invention;
fig. 2 is a schematic diagram of an embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the following figures and examples:
example one
As shown in figure 1, the device and the process for continuously gasifying non-slag pure oxygen by using the indirect cooling type moving bed of the invention comprise gasification equipment, dust removal equipment, waste heat recovery equipment and cold treatment equipment;
the gasification equipment comprises a gasification furnace 1, wherein a raw material coal hopper 10 is arranged at the top of the gasification furnace 1, a gasification agent inlet 16 is arranged at the bottom of the gasification furnace 1, a coal gas outlet 11 is arranged on the gasification furnace 1, and the coal gas outlet 11 is connected with the dust removal equipment through a connecting pipeline;
the dust removing equipment comprises a cyclone dust collector 2 and a high-temperature bag type dust collector 3, the cyclone dust collector 2 and the high-temperature bag type dust collector 3 are connected in series for operation, and dust carried in coal gas output from the gasification furnace 1 can be thoroughly removed, so that the coal gas is thoroughly purified, the scouring of the waste heat recoverer is reduced, the service life of the waste heat recoverer is prolonged, and meanwhile, the waste of water resources caused by washing and dust removal is avoided, and secondary pollution is also avoided; the cyclone dust collector 2 and the high-temperature bag type dust collector 3 are both provided with a coal gas inlet and a coal gas outlet; the coal gas inlet 21 of the cyclone dust collector 2 is connected with the coal gas outlet 11 of the gasification furnace 1 through a connecting pipeline, and the coal gas outlet 22 of the cyclone dust collector 2 is connected with the coal gas inlet 31 of the high-temperature bag type dust collector 3 through a connecting pipeline; the high-temperature bag type dust collector 3 is also provided with a gas back flushing port 33, and the gas back flushing port 33 regularly performs gas back flushing to ensure that coal ash dispersed in coal gas is fully purified and removed, so that the dust collection effect is improved; the lower end of the high-temperature bag type dust collector 3 is provided with a dust outlet 34 which is used for discharging the dust processed by the high-temperature bag type dust collector 3 in time, so that the continuity and the stability of the operation of the high-temperature bag type dust collector 3 are ensured; when the high-temperature bag type dust collector 3 is used, the temperature is preferably 400-800 ℃, and the pressure is preferably 30-70 kPa, so that the dust collection effect can be further improved; the coal gas outlet 32 of the high-temperature bag type dust collector 3 is connected with the waste heat recovery equipment through a connecting pipeline;
the waste heat recovery device comprises a waste heat recoverer 4, the waste heat recoverer 4 realizes the recovery of gradient heat through different heat exchange layers, the heat recovery maximization is realized, and the gasification efficiency and the gasification effect of the utility model are improved; the waste heat recoverer 4 is respectively connected with a second low-pressure steam pocket 4-1 and a second medium-pressure steam pocket 4-2 through connecting pipelines, medium-pressure saturated steam generated by the waste heat recoverer 4 in the working process is discharged out of the system through an outlet 43 arranged at the upper end of the second medium-pressure steam pocket 4-2, low-pressure superheated steam generated by the waste heat recoverer 4 in the working process enters the waste heat recoverer through a low-pressure superheated steam inlet 44, and is finally discharged out of the system through a low-pressure superheated steam outlet 49; a coal gas inlet 41 and a coal gas outlet 42 are arranged on the waste heat recoverer 4, the coal gas inlet 41 of the waste heat recoverer 4 is connected with the coal gas outlet 32 of the high-temperature bag type dust collector through a connecting pipeline, and the coal gas outlet 42 of the waste heat recoverer 4 is connected with cold treatment equipment through a connecting pipeline;
the cold treatment equipment comprises an intercooler 5, the intercooler 5 mainly cools the coal gas entering the interior of the cold treatment equipment, and the conventional washing tower is replaced by the intercooler 5, so that non-contact indirect heat exchange of the coal gas can be realized, the problem of unorganized discharge of VOCs (volatile organic compounds) in the coal gas washing wastewater is solved, zero discharge of the coal gas wastewater is realized, and the environmental protection performance of the utility model is further improved; the intercooler 5 is provided with an intercooler gas inlet 51, an intercooler gas outlet 52, an intercooler water inlet 54 and an intercooler water outlet 53; the intercooler coal gas inlet 51 is connected with the coal gas outlet 42 of the waste heat recoverer through a connecting pipeline, and the intercooler coal gas outlet 52 is connected with a product coal gas connecting pipe network through a connecting pipeline;
the whole section of the cylinder body of the gasification furnace 1 is of a water-cooled wall structure, the water-cooled wall is divided into an upper section and a lower section, the upper section is a low-pressure section, and the lower section is a medium-pressure section; the water-cooled wall is arranged for absorbing high-temperature radiant heat in the gasification furnace 1 and ensuring continuous and stable gasification; the upper section water cooled wall is connected with the first low pressure steam pocket 1-1 through a connecting pipeline to generate low pressure saturated steam of 0.6MPa, and the low pressure saturated steam is discharged out of the system through an outlet 12 arranged at the upper end of the first low pressure steam pocket 1-1; the lower section water-cooled wall is connected with the first medium-pressure steam drum 1-2 through a connecting pipeline to generate medium-pressure saturated steam of 1.6MPa, and the medium-pressure saturated steam is discharged out of the system through an outlet 13 arranged at the top end of the first medium-pressure steam drum 1-2; and each section of water-cooled wall is provided with two layers of temperature measuring devices, and 4 temperature measuring points of each layer of temperature measuring device are distributed at a right angle, so that the gasification temperature is conveniently controlled in a certain interval, and the gasification efficiency of coal gas is improved. The top of the gasification furnace 1 is provided with an automatic coke feeder 15, the raw material coal hopper 10 is arranged on the automatic coke feeder 15, and the automatic coke feeder 15 is provided with a coal gas locking and replacing system, so that pressurized coal feeding can be realized, the operation is simple and convenient, and the working efficiency is improved; 7-15 layers of polygonal grates are arranged in the gasification furnace 1, preferably 11-14 layers, the height-diameter ratio of the gasification furnace 1 is optimized, the optimized height-diameter ratio of the gasification furnace 1 is 2-5, and the preferred height-diameter ratio is 3.5-4.5; the optimal arrangement of the height-diameter ratio of the grate and the gasification furnace 1 can improve the gasification efficiency, so that the effective gas content reaches more than 85 percent, and the ash residue carbon content is lower than 0.5 percent; the bottom end of the gasification furnace 1 is provided with a forced deslagging device 14, the forced deslagging device 14 is arranged around the bottom end of the gasification furnace 1 and has a four-ash bucket or six-ash bucket structure, gasified ash in the gasification furnace 1 can be discharged in time, and continuous and stable operation of the gasification furnace 1 is guaranteed.
The small ash bin 23 is arranged at the bottom end of the cyclone dust collector 2, unattended automatic operation can be achieved due to the arrangement of the small ash bin 23, operation is safe and fast, meanwhile, dust collected in the working process of the cyclone dust collector 2 is conveniently and intensively cleaned, gasification efficiency is improved, and gasification effect is enhanced; the gas selected when the high-temperature bag type dust collector 3 is subjected to gas back flushing is nitrogen or carbon dioxide, the nitrogen and the carbon dioxide are stable and safe, and the dust collection efficiency and the safety in the operation process can be ensured.
The waste heat recovery device 4 is internally provided with a medium-pressure evaporation section, a low-pressure overheating section, a low-pressure evaporation section and a soft water preheating section from top to bottom in sequence, wherein the medium-pressure evaporation section is connected with a second medium-pressure steam pocket 4-2 through a connecting pipeline, medium-pressure saturated steam generated in the waste heat recovery process is discharged out of the system through an outlet 43 arranged at the upper end of the second medium-pressure steam pocket 4-2, the low-pressure overheating section and the low-pressure evaporation section are respectively connected with a second low-pressure steam pocket 4-1 through connecting pipelines, low-pressure overheated steam generated in the waste heat recovery process enters the low-pressure overheating section through a low-pressure overheated steam inlet 44 and is finally discharged out of the system through a low-pressure overheated steam; a soft water preheating section water inlet 46 is formed in the bottom end of the soft water preheating section, the soft water preheating section water inlet 46 is communicated with an external water source through a connecting pipeline, a water outlet 47 is formed in the top end of the soft water preheating section, and the soft water preheating section water outlet 47 is communicated with a water conveying pipeline 48 arranged between the second low-pressure steam pocket 4-1 and the second medium-pressure steam pocket 4-2 through the connecting pipeline; by inputting water flow into the soft water preheating section, the water flow circularly flows between the sections inside the second low-pressure steam pocket 4-1, the second medium-pressure steam pocket 4-2 and the waste heat recoverer 4, so that the operation performance of the utility model is further improved, and the gasification efficiency is enhanced;
the inside heat exchange tube that is provided with of intercooler 5, the heat exchange tube can adopt node heat exchange tube, snakelike heat exchange tube etc. and the heat exchange tube adopts vertical distribution, can realize the indirect heat transfer of non-contact of coal gas, has saved the scrubbing tower washing technology commonly used, has really realized the gasification and has not discharged waste water, promotes the utility model discloses a performance, water economy resource have also avoided the hidden danger of the water pollution that produces by scrubbing tower washing technology simultaneously.
Example two
As shown in FIG. 2, the device and process for continuously gasifying non-slag pure oxygen by using indirect cooling moving bed of the present invention comprises a gasification device, a dust removal device, a waste heat recovery device and a cold treatment device;
the gasification equipment comprises a gasification furnace 1, wherein a raw material coal hopper 10 is arranged at the top of the gasification furnace 1, a gasification agent inlet 16 is arranged at the bottom of the gasification furnace 1, a coal gas outlet 11 is arranged on the gasification furnace 1, and the coal gas outlet 11 is connected with the dust removal equipment through a connecting pipeline;
the dust removing equipment comprises a cyclone dust collector 2 and a high-temperature bag type dust collector 4, a high-temperature gas cooler 3 is arranged between the cyclone dust collector 2 and the high-temperature bag type dust collector 4, the high-temperature gas cooler 3 is respectively connected with the cyclone dust collector 2 and the high-temperature bag type dust collector 4 through connecting pipelines, and the top end and the bottom end of the high-temperature gas cooler 3 are both connected with a second medium-pressure steam pocket 3-1 through connecting pipelines; the high-temperature gas cooler 3 can discharge heat carried in the gas output from the cyclone dust collector 2 through an outlet 33 arranged at the top end of the second medium-pressure steam pocket 3-1, reduce the heat of the gas entering the high-temperature bag type dust collector 4, prolong the service life of the high-temperature bag type dust collector 4, increase the selectivity of the high-temperature bag type dust collector 4 and reduce the cost; the cyclone dust collector 2 and the high-temperature bag type dust collector 4 are both provided with a coal gas inlet and a coal gas outlet; the gas inlet 21 of the cyclone dust collector 2 is connected with the gas outlet 11 of the gasification furnace 1 through a connecting pipeline, and the gas outlet 22 of the cyclone dust collector 2 is connected with the gas inlet 31 of the high-temperature gas cooler through a connecting pipeline; the gas outlet 32 of the high-temperature gas cooler is connected with a gas inlet 41 arranged on the high-temperature bag type dust collector 4 through a connecting pipeline, a gas back-blowing port 44 is also arranged on the high-temperature bag type dust collector 4, and the gas back-blowing port 44 performs gas back-blowing at regular time to ensure that coal ash dispersed in the gas is fully purified and removed, so that the dust removal effect is improved; the lower end of the high-temperature bag type dust collector 4 is provided with a dust outlet 43 which is used for discharging the dust processed by the high-temperature bag type dust collector 4 in time, so that the continuity and the stability of the operation of the high-temperature bag type dust collector 4 are ensured; when the high-temperature bag type dust collector 4 is used, the temperature is preferably 400-800 ℃, and the pressure is preferably 30-70 kPa, so that the dust collection effect can be further improved; the coal gas outlet 42 of the high-temperature bag type dust collector 4 is connected with the waste heat recovery equipment through a connecting pipeline;
the waste heat recovery device comprises a waste heat recoverer 5, the waste heat recoverer 5 realizes the recovery of gradient heat through different heat exchange layers, the heat recovery maximization is realized, and the gasification efficiency and the gasification effect of the utility model are improved; the waste heat recoverer 5 is connected with a second low-pressure steam pocket 5-1 through a connecting pipeline, low-pressure superheated steam generated by the waste heat recoverer 5 in the working process enters the waste heat recoverer 5 through a low-pressure superheated steam inlet 53 and is finally discharged out of the system through a low-pressure superheated steam outlet 56; a coal gas inlet 51 and a coal gas outlet 52 are arranged on the waste heat recoverer 5, the coal gas inlet 51 of the waste heat recoverer 5 is connected with the coal gas outlet 42 of the high-temperature bag type dust collector 4 through a connecting pipeline, and the coal gas outlet 52 of the waste heat recoverer 5 is connected with cold treatment equipment through a connecting pipeline;
the cold treatment equipment comprises an intercooler 6, the intercooler 6 mainly cools the coal gas entering the interior of the cold treatment equipment, and the conventional washing tower is replaced by the intercooler 6, so that non-contact indirect heat exchange of the coal gas can be realized, the problem of unorganized discharge of VOCs (volatile organic compounds) in the coal gas washing wastewater is solved, zero discharge of the coal gas wastewater is realized, and the environmental protection performance of the utility model is further improved; the intercooler 6 is provided with an intercooler gas inlet 61, an intercooler gas outlet 62, an intercooler water inlet 64 and an intercooler water outlet 63; the intercooler coal gas inlet 61 is connected with the coal gas outlet 52 of the waste heat recoverer through a connecting pipeline, and the intercooler coal gas outlet 62 is connected with a product coal gas connecting pipe network through a connecting pipeline;
the whole section of the cylinder body of the gasification furnace 1 is of a water-cooled wall structure, the water-cooled wall is divided into an upper section and a lower section, the upper section is a low-pressure section, and the lower section is a medium-pressure section; the water-cooled wall is arranged for absorbing high-temperature radiant heat in the gasification furnace 1 and ensuring continuous and stable gasification; the upper section water cooled wall is connected with a first low pressure steam pocket 1-1 through a connecting pipeline and can generate low pressure saturated steam of 0.6MPa, the upper end of the first low pressure steam pocket 1-1 is provided with an outlet 12, the outlet 12 is communicated with the connecting pipeline arranged at the upper end of a second low pressure steam pocket 5-1 through the connecting pipeline, the generated low pressure superheated steam is conveyed into the waste heat recoverer 5 through the connecting pipeline from a low pressure superheated steam inlet 53, and finally the low pressure superheated steam is discharged out of the system through a low pressure superheated steam outlet 56; the lower section water cooled wall is connected with the first medium pressure steam drum 1-2 through a connecting pipeline to generate medium pressure saturated steam of 1.6MPa, and the medium pressure saturated steam is discharged out of the system through an outlet 13 arranged at the top end of the first medium pressure steam drum 1-2; and each section of water-cooled wall is provided with two layers of temperature measuring devices, and 4 temperature measuring points of each layer of temperature measuring device are distributed at a right angle, so that the gasification temperature is conveniently controlled in a certain interval, and the gasification efficiency of coal gas is improved. The top of the gasification furnace 1 is provided with an automatic coke feeder 15, the raw material coal hopper 10 is arranged on the automatic coke feeder 15, and the automatic coke feeder 15 is provided with a coal gas locking and replacing system, so that pressurized coal feeding can be realized, the operation is simple and convenient, and the working efficiency is improved; 7-15 layers of polygonal grates are arranged in the gasification furnace 1, preferably 11-14 layers, the height-diameter ratio of the gasification furnace 1 is optimized, the optimized height-diameter ratio of the gasification furnace 1 is 2-5, and the preferred height-diameter ratio is 3.5-4.5; the optimal arrangement of the height-diameter ratio of the grate and the gasification furnace 1 can improve the gasification efficiency, so that the effective gas content reaches more than 85 percent, and the ash residue carbon content is lower than 0.5 percent; the bottom end of the gasification furnace 1 is provided with a forced deslagging device 14, the forced deslagging device 14 is arranged around the bottom end of the gasification furnace 1 and has a four-ash bucket or six-ash bucket structure, gasified ash in the gasification furnace 1 can be discharged in time, and continuous and stable operation of the gasification furnace 1 is guaranteed.
The small ash bin 23 is arranged at the bottom end of the cyclone dust collector 2, unattended automatic operation can be realized due to the arrangement of the small ash bin 23, dust collected by the cyclone dust collector 2 in the working process can be conveniently and intensively cleaned, the gasification efficiency is improved, and the gasification effect is enhanced; the gas selected during the gas back flushing of the high-temperature bag type dust collector 4 is nitrogen or carbon dioxide, the nitrogen and the carbon dioxide are stable and safe, and the dust collection efficiency and the safety in the operation process can be ensured.
The waste heat recoverer 5 is internally provided with a low-pressure overheating section, a low-pressure evaporation section and a soft water preheating section from top to bottom in sequence, and the low-pressure overheating section and the low-pressure evaporation section are respectively connected with a second low-pressure steam pocket 5-1 through connecting pipelines; the low-pressure superheated steam generated in the process of waste heat recovery is conveyed into the low-pressure superheating section of the waste heat recoverer 5 through a low-pressure superheated steam inlet 53 after being communicated with a connecting pipeline arranged on an outlet 12 through a connecting pipeline arranged at the upper end of a second low-pressure steam pocket 5-1, and is finally discharged out of the system through a low-pressure superheated steam outlet 56; by inputting water flow into the soft water preheating section, the water flow circularly flows between the second low-pressure steam pocket 5-1 and each section in the waste heat recoverer 5, the operation performance of the utility model is further improved, and the gasification efficiency is enhanced;
the inside heat exchange tube that is provided with of intercooler 6, heat exchange tube can adopt node heat exchange tube, snakelike heat exchange tube etc. and the heat exchange tube adopts vertical distribution, can realize the indirect heat transfer of non-contact of coal gas, has saved the scrubbing tower washing technology commonly used, has really realized the gasification and has not discharged waste water, promotes the utility model discloses a performance, water economy resource have also avoided the hidden danger of the water pollution that produces by scrubbing tower washing technology simultaneously.
Claims (8)
1. An indirect cooling type moving bed non-slag pure oxygen continuous gasification device is characterized in that: the system comprises gasification equipment, dust removal equipment, waste heat recovery equipment and cold treatment equipment;
the gasification equipment comprises a gasification furnace, the top of the gasification furnace is provided with a raw material coal hopper, the bottom of the gasification furnace is provided with a gasification agent inlet, the gasification furnace is provided with a coal gas outlet, and the coal gas outlet is connected with the dust removal equipment through a connecting pipeline;
the dust removing equipment comprises a cyclone dust remover and a high-temperature bag type dust remover, wherein a coal gas inlet and a coal gas outlet are formed in the cyclone dust remover and the high-temperature bag type dust remover respectively; the gas inlet of the cyclone dust collector is connected with the gas outlet of the gasification furnace through a connecting pipeline, and the gas outlet of the cyclone dust collector is connected with the gas inlet of the high-temperature bag type dust collector through a connecting pipeline; the high-temperature bag type dust collector is also provided with a gas back flushing port, and the lower end of the high-temperature bag type dust collector is provided with a dust outlet; the coal gas outlet of the high-temperature bag type dust collector is connected with the waste heat recovery equipment through a connecting pipeline;
the waste heat recovery device comprises a waste heat recoverer, a coal gas inlet and a coal gas outlet are arranged on the waste heat recoverer, the coal gas inlet of the waste heat recoverer is connected with the coal gas outlet of the high-temperature bag type dust collector through a connecting pipeline, and the coal gas outlet of the waste heat recoverer is connected with the cold treatment device through a connecting pipeline;
the cold treatment equipment comprises an intercooler, wherein an intercooler coal gas inlet, an intercooler coal gas outlet, an intercooler water inlet and an intercooler water outlet are arranged on the intercooler; the indirect cooler coal gas inlet is connected with the coal gas outlet of the waste heat recoverer through a connecting pipeline, and the indirect cooler coal gas outlet is connected with the product coal gas connecting pipe network through a connecting pipeline.
2. The indirect-cooled moving bed non-molten slag pure oxygen continuous gasification device according to claim 1, which is characterized in that: the gasifier barrel is of a water-cooled wall structure in the whole section, the water-cooled wall is divided into an upper section and a lower section, the upper section is a low-pressure section, the lower section is a medium-pressure section, the upper section water-cooled wall is connected with a first low-pressure steam drum through a connecting pipeline, and the lower section water-cooled wall is connected with the first medium-pressure steam drum through a connecting pipeline.
3. The indirect-cooled moving bed non-molten slag pure oxygen continuous gasification device according to claim 1, which is characterized in that: the top of the gasification furnace is provided with an automatic coke feeder, and a raw material coal hopper is arranged on the automatic coke feeder; the bottom end of the gasification furnace is provided with a forced deslagging device which is arranged around the bottom end of the gasification furnace and has a four-ash bucket or six-ash bucket structure.
4. The indirect-cooled moving bed non-molten slag pure oxygen continuous gasification device according to claim 1, which is characterized in that: the inside 7 to 15 layers of polygonal grates that are provided with of gasifier and optimize the height-diameter ratio of gasifier, the height-diameter ratio of gasifier optimization is 2 to 5.
5. The indirect-cooled moving bed non-molten slag pure oxygen continuous gasification device according to claim 1, which is characterized in that: the bottom end of the cyclone dust collector is provided with a small ash bin, and the gas selected during the gas back blowing of the high-temperature bag-type dust collector is nitrogen or carbon dioxide.
6. The indirect-cooled moving bed non-molten slag pure oxygen continuous gasification device according to claim 1, which is characterized in that: the waste heat recoverer is internally provided with a medium-pressure evaporation section, a low-pressure overheating section, a low-pressure evaporation section and a soft water preheating section from top to bottom in sequence.
7. The indirect-cooling moving bed non-slag pure oxygen continuous gasification device according to claim 1, wherein a high-temperature gas cooler is arranged between the cyclone dust collector and the high-temperature bag type dust collector, and a low-pressure superheat section, a low-pressure evaporation section and a soft water preheating section are sequentially arranged in the waste heat recoverer from top to bottom.
8. The indirect-cooled moving bed non-molten slag pure oxygen continuous gasification device according to claim 1, which is characterized in that: the intercooler inside be provided with the heat exchange tube, and the heat exchange tube adopts vertical distribution.
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