CN112342046A - Low order coal double-decomposition double-purification dry quenching system - Google Patents
Low order coal double-decomposition double-purification dry quenching system Download PDFInfo
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- CN112342046A CN112342046A CN202011000971.8A CN202011000971A CN112342046A CN 112342046 A CN112342046 A CN 112342046A CN 202011000971 A CN202011000971 A CN 202011000971A CN 112342046 A CN112342046 A CN 112342046A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
Abstract
The invention discloses a low-rank coal double-decomposition double-purification dry quenching system which comprises a first treatment system and a second treatment system, wherein the first treatment system is composed of a drying device, a rotary dry distillation furnace and a cooling device and is used for realizing dry distillation pyrolysis, the second treatment system is used for realizing gas purification and low-temperature preheating, the second treatment system comprises an EN horizontal furnace and an EN vertical furnace, the EN horizontal low-temperature dry distillation furnace and the gas purification chamber form the EN horizontal furnace, and coal materials in the EN horizontal low-temperature dry distillation furnace are subjected to low-temperature dry distillation and then enter the EN vertical furnace and are conveyed to the cooling device through a pipeline; dry distillation gas in the rotary dry distillation furnace is conveyed to the EN vertical furnace through a pipeline and upwards penetrates through an internal coal bed of the EN vertical furnace to realize primary dust filtration; a small amount of dry distillation gas in the EN horizontal low-temperature dry distillation furnace realizes primary dust removal and purification through a screen plate dust remover, and the dry distillation gas after the primary dust removal and purification enters a coal gas purification chamber to realize secondary dust removal and purification through an impact type inertia large-space sedimentation dust removal device. The invention improves the oil gas quality and has good environmental protection.
Description
Technical Field
The invention relates to the technical field of coal pyrolysis, in particular to a low-rank coal double-decomposition double-purification dry quenching system.
Background
The low-rank coal refers to coal with low coalification degree, such as lignite, long-flame coal, non-caking coal, weakly caking coal, gas coal and the like. The low-rank coal has no caking property or small caking property and is not generally suitable for coking, but has larger volatile matter, and can recover tar and coal gas through medium-low temperature dry distillation and produce semicoke at the same time. The low-rank coal is divided into pulverized coal and lump coal according to the shape and size, and 70 percent of the low-rank coal obtained by the existing mechanical mining is pulverized coal and 30 percent of the low-rank coal is lump coal. In order to realize the cleanness of coal utilization, the method is particularly important for quality classification and efficient utilization of coal.
A typical low-rank coal dry distillation system in the prior art comprises a horizontal drying furnace, a rotary dry distillation furnace, a horizontal cooling furnace and the like which are connected in sequence, wherein coal materials are dried by the horizontal drying furnace and then enter the rotary dry distillation furnace for dry distillation and pyrolysis to generate pyrolysis gas and hot semicoke, the pyrolysis gas is separated by a separating device to obtain coal gas and tar, and the hot semicoke is cooled by the horizontal cooling furnace to generate semicoke.
The main problems to be urgently solved by the traditional low-rank coal carbonization system are as follows: due to the fact that the content of dust in the generated pyrolysis gas is high (up to 20%), the content of dust in tar is large, and therefore hydrogenation quality improvement treatment of tar cannot be achieved; in addition, the phenomena of easy blockage, easy coking and the like of the pipeline of the equipment are easily caused, the service life of the equipment is short, and the serious environmental protection problems of incomplete oil-water separation, difficult sewage treatment and the like are caused.
Disclosure of Invention
In order to solve the problems, the invention provides a low-rank coal double-decomposition double-purification dry quenching system, aims to improve the quality of oil gas, lays a foundation for the hydrogenation and quality improvement treatment of tar, and simultaneously prolongs the service life of equipment and improves the environmental protection performance. The specific technical scheme is as follows:
the low-rank coal double-decomposition double-purification dry quenching system comprises a first treatment system and a second treatment system, wherein the first treatment system consists of a drying device, a rotary type dry distillation furnace and a cooling device which are sequentially connected, the second treatment system is used for realizing dry distillation pyrolysis, the second treatment system is connected with the first treatment system and is used for realizing gas purification and low-temperature preheating, the second treatment system comprises an EN horizontal type low-temperature dry distillation furnace and an EN vertical furnace, the EN horizontal type low-temperature dry distillation furnace is connected with a gas purification chamber on the upper side of the EN horizontal type low-temperature dry distillation furnace, the EN vertical furnace is connected with the lower side of the EN horizontal type low-temperature dry distillation furnace, coal materials in the EN horizontal type low-temperature dry distillation furnace enter the EN vertical furnace from the upper end opening of the EN vertical furnace after low-temperature dry distillation, come out from the lower end opening of the EN vertical furnace; the dry distillation gas in the rotary dry distillation furnace is conveyed to the lower port part of the EN vertical furnace through a pipeline and upwards passes through the internal coal bed of the EN vertical furnace to realize primary dust filtration, and then is conveyed into the coal gas purification chamber through the pipeline; the low-temperature dry distillation gas in the EN horizontal low-temperature dry distillation furnace enters the coal gas purification chamber after primary dust removal and purification are realized through a screen plate dust remover arranged between the EN horizontal low-temperature dry distillation furnace and the coal gas purification chamber, and a dry distillation gas outlet part of the coal gas purification chamber is provided with an impact type inertia large-space sedimentation dust removal device to realize secondary dust removal and purification of the dry distillation gas; the impact type inertial large-space sedimentation dust removal device is connected with a coal gas purification system.
Preferably, the rotary retort and the EN horizontal low-temperature retort are respectively provided with a coal material inlet, a rotary rake for stirring coal materials is arranged in the EN horizontal low-temperature retort, a retort gas output hole is formed in the wall of the upper half cylinder of the EN horizontal low-temperature retort, the sieve plate dust remover is arranged above the retort gas output hole, and low-temperature retort gas in the EN horizontal low-temperature retort flows out of the retort gas output hole, then passes through the sieve plate dust remover for primary dust removal and purification and then enters the coal gas purification chamber.
Preferably, the impact type inertial large-space sedimentation dust removal device comprises a dust hopper arranged at a dry distillation gas outlet part of the gas purification chamber, and a plurality of baffle plates which are arranged in the dust hopper and distributed in a stepped manner at intervals, wherein dust in the dust hopper falls into the EN horizontal low-temperature dry distillation furnace through a dust outlet arranged at the bottom of the dust hopper, and dry distillation gas in the gas purification chamber is discharged from the dust hopper after impacting the baffle plates to realize secondary dust removal and purification, and then enters the gas purification system connected with the dust hopper.
In the invention, the gas purification system comprises an oil-gas separation device, a gas outlet of the oil-gas separation device is connected with a purification desulfurization machine, and a liquid-oil outlet of the oil-gas separation device is connected with a tar dehydrator.
According to the invention, a hot flue gas inlet and a hot flue gas outlet are respectively arranged on the rotary retort, the EN vertical furnace and the EN horizontal low-temperature retort, hot flue gas channels are respectively arranged in the rotary retort, the EN vertical furnace and the EN horizontal low-temperature retort, the hot flue gas outlet of the rotary retort is connected with the hot flue gas inlet of the EN vertical furnace through a flue gas pipeline, the hot flue gas outlet of the EN vertical furnace is connected with the hot flue gas inlet of the EN horizontal low-temperature retort through a flue gas pipeline, the hot flue gas inlet on the rotary retort is connected with a hot blast stove, and the hot blast stove adopts coal gas generated by the coal gas purification system as fuel for generating hot flue gas.
The low-rank coal double-decomposition double-purification dry quenching system is also provided with a flue gas waste heat recovery and purification system, the flue gas waste heat recovery and purification system comprises a waste heat boiler, a flue gas dust removal device, a desulfurization device and a chimney which are sequentially connected through a flue gas pipeline, a hot flue gas outlet of the EN horizontal low-temperature gas retort is connected with a hot flue gas inlet of the waste heat boiler, and a waste heat utilization steam pipe is arranged on the waste heat boiler.
Preferably, the drying device in the first treatment system is a drying furnace or a fluidized bed dryer with a built-in heating module.
Preferably, the cooling device in the first treatment system is a cooling furnace or a semicoke cooler.
In the invention, when the drying device in the first treatment system adopts a fluidized bed dryer, a steam pipe of the waste heat boiler is connected with a built-in heating module of the fluidized bed dryer; when the drying device in the first treatment system adopts the semicoke cooler, the semicoke cooler is connected with a blade type cooler; and a flue gas supply loop is led out from a flue gas pipeline of the waste heat boiler and is used for providing fluidized air of the fluidized bed dryer.
Preferably, the coal used by the first treatment system is pulverized coal, and the coal used by the second treatment system is lump coal, small-particle coal with a diameter of 6-30 mm or semicoke.
Preferably, a plurality of hot flue gas channels are arranged on the rotary retort and are arranged along the inner wall of the cylinder of the rotary retort, a plurality of hot flue gas channels in the EN vertical retort are vertically arranged and are distributed at intervals and communicated with each other, and a plurality of hot flue gas channels on the EN horizontal low-temperature retort are arranged along the inner wall of the cylinder of the EN horizontal low-temperature retort; and the coal ash after dust removal by the flue gas dust removal device is conveyed into the rotary dry distillation furnace through a pipeline.
In the invention, the ash blowing hole is arranged on a pipeline for the passing of the dry distillation gas connected between the rotary retort and the EN vertical furnace, and the ash blowing hole is arranged on a pipeline for the passing of the dry distillation gas connected between the EN vertical furnace and the coal gas purification chamber.
In the invention, a back-blowing device is arranged in the gas purification chamber and is used for carrying out back-blowing dust removal on the screen plate dust remover, and the back-blowing device uses purified gas treated by the gas purification system as back-blowing gas.
The material flow in the invention is as follows:
(1) in the first treatment system, after the pulverized coal enters a drying device (a drying furnace or a fluidized bed dryer) for drying, the pulverized coal is sent into a rotary dry distillation furnace by a screw feeder to indirectly transfer heat with high-temperature flue gas, dry distillation pyrolysis is realized, the pulverized coal is changed into semicoke, and then the semicoke is sent to a cooling device to generate cold semicoke;
(2) in the second treatment system, the coal material sequentially enters the EN horizontal low-temperature dry distillation furnace and the EN vertical furnace to indirectly transfer heat with the high-temperature flue gas, dry distillation pyrolysis is realized, the coal material is changed into semicoke, and then the semicoke is sent to a cooling device (a cooling furnace or a semicoke cooler) to generate cold semicoke.
The pyrolysis gas flow in the invention is as follows:
(1) in the first treatment system, pulverized coal in the rotary dry distillation furnace is subjected to dry distillation and pyrolysis to generate pyrolysis gas, the pyrolysis gas enters from the lower end opening of the EN vertical furnace, upwards passes through a coal bed in the EN vertical furnace to perform primary dust filtration, and enters a coal gas purification chamber;
(2) in a second treatment system, the coal material in the EN horizontal low-temperature dry distillation furnace is subjected to dry distillation pyrolysis to generate pyrolysis gas, primary dust filtration is carried out through a screen plate dust remover, and then the pyrolysis gas enters a coal gas purification chamber;
(3) pyrolysis gas entering the gas purification chamber is subjected to secondary dust filtration by an impact type inertia large-space sedimentation dust removal device and then is output to a gas purification system for oil-gas separation to generate gas and tar;
the flue gas flow in the invention is as follows:
and (2) feeding the coal gas generated by the treatment of the coal gas purification system into a hot blast stove for combustion, feeding the generated high-temperature flue gas into hot flue gas channels of a rotary retort furnace, an EN vertical furnace and an EN horizontal low-temperature retort furnace in sequence for indirect heat transfer, then feeding the flue gas into a waste heat boiler for heat exchange with water to about 130 ℃, discharging the flue gas out of the waste heat boiler, and emptying the flue gas after dust removal and desulfurization. Wherein, a part of the flue gas which is discharged from the waste heat boiler can be introduced into a drying device (a drying furnace or a fluidized bed dryer) to be used as a heat source for heating and drying and used as a fluidizing and moisture-carrying medium in the fluidized bed dryer.
The invention has the beneficial effects that:
firstly, the low-rank coal double-decomposition double-purification dry quenching system provided by the invention is additionally provided with the second treatment system on the basis of the first treatment system, so that the quality improvement treatment of low-rank coal fine coal is realized, the dust content of treated pyrolysis gas is greatly reduced, the traditional 20% dust content can be reduced to below 5%, the oil gas quality is greatly improved, the foundation is laid for the hydrogenation quality improvement treatment of tar, and the environmental protection performance is improved. The device is particularly suitable for carrying out technical transformation on the existing three-stage linkage dry distillation pyrolysis system integrating drying, dry distillation and cooling, can greatly reduce the dust content in dry distillation pyrolysis gas and tar, and lays a foundation for hydrogenation quality improvement treatment of the tar.
Secondly, the low-rank coal double-decomposition double-purification dry quenching system can greatly reduce the accumulation of dust on the inner wall of the system pipeline by additionally arranging the second treatment system, thereby prolonging the service life of equipment.
Thirdly, according to the low-rank coal double-decomposition double-purification dry quenching system, the EN horizontal low-temperature dry distillation furnace in the second treatment system adopts the built-in rotary rake to turn over the pulverized coal in the horizontal cylinder, so that the pulverized coal is uniformly heated, and meanwhile, the turned loose coal forms a dynamic pulverized coal filter layer for pyrolysis gas, so that a good dust removal effect on the pyrolysis gas is achieved, and the dust removal effect of the pyrolysis gas is improved.
Fourthly, the low-rank coal double-decomposition double-purification dry quenching system has the advantages that the dust amount can be greatly reduced by using lump coal in the second treatment system, so that the dust removal effect can be further improved.
Fifthly, according to the low-rank coal double-decomposition double-purification dry quenching system, the screen plate dust remover is arranged between the EN horizontal low-temperature dry distillation furnace and the coal gas purification chamber, and the impact type inertia large-space sedimentation dust removal device is arranged on the coal gas purification chamber, so that secondary dust filtration of pyrolysis gas is realized, and the dust removal effect is further improved.
Sixth, according to the low-rank coal double-decomposition double-purification dry quenching system, the first treatment system and the second treatment system are cooperated with each other, so that the production efficiency is improved, and the dust removal effect of pyrolysis gas is improved, and therefore the defects of high oil gas dust content and short service life of equipment in a traditional drying, dry distillation and cooling three-level linkage pulverized coal treatment system are overcome at one stroke.
Drawings
FIG. 1 is a schematic structural diagram of a low-rank coal double-decomposition double-purification dry quenching system (in the figure, a drying furnace is adopted as a drying device, and a cooling furnace is adopted as a cooling device);
FIG. 2 is another schematic structural diagram of a low-rank coal double-decomposition double-purification dry quenching system (in the figure, a fluidized bed dryer is adopted as a drying device, and a semicoke cooler is adopted as a cooling device);
FIG. 3 is an enlarged view of a portion of FIGS. 1 and 2 relating to a second processing system;
fig. 4 is a schematic structural view (left side view) of a screen plate dust remover arranged between the gas purification chamber and the EN horizontal low-temperature retort in fig. 1 and 2.
In the figure: 1. the system comprises a drying device, 2, a rotary retort, 3, a cooling device, 4, a first treatment system, 5, a second treatment system, 6, an EN horizontal low-temperature retort, 7, a coal gas purification chamber, 8, an EN vertical furnace, 9, a screen plate dust remover, 10, an impact type inertia large-space sedimentation dust removal device, 11, a coal gas purification system, 12, a coal material inlet, 13, a retort gas output hole, 14, a steam pipe, 15, a dust hopper, 16, a baffle, 17, a hot flue gas channel, 18, a hot flue gas inlet, 19, a hot flue gas outlet, 20, a hot blast stove, 21, a flue gas waste heat recovery and purification system, 22, a waste heat boiler, 23, a flue gas dust removal device, 24, a desulfurization device, 25, a chimney, 26 and a back flushing device.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in FIGS. 1 to 3, the embodiment of the low-rank coal double-decomposition double-purification dry quenching system of the invention comprises a first treatment system 4 for realizing dry distillation pyrolysis and a second treatment system 5 for realizing gas purification and low-temperature preheating, wherein the first treatment system 4 consists of a drying device 1, a rotary retort 2 and a cooling device 3 which are connected in sequence, the second treatment system 5 comprises an EN horizontal furnace consisting of an EN horizontal low-temperature carbonization furnace 6, a gas purification chamber 7 connected with the upper side of the EN horizontal low-temperature carbonization furnace 6, and an EN vertical furnace 8 connected with the lower side of the EN horizontal low-temperature carbonization furnace 6, the coal material in the EN horizontal low-temperature carbonization furnace 6 is subjected to low-temperature carbonization, enters the EN vertical furnace 8 from the upper end opening of the EN vertical furnace 8, comes out from the lower end opening of the EN vertical furnace 8, and is conveyed to the cooling device 3 through a pipeline; the dry distillation gas in the rotary dry distillation furnace 2 is conveyed to the lower port part of the EN vertical furnace 8 through a pipeline, upwards passes through the internal coal bed of the EN vertical furnace 8 to realize primary dust filtration, and then is conveyed into the coal gas purification chamber 7 through a pipeline; the low-temperature dry distillation gas in the EN horizontal low-temperature dry distillation furnace 6 is subjected to primary dust removal purification through a screen plate dust remover 9 arranged between the EN horizontal low-temperature dry distillation furnace 6 and the coal gas purification chamber 7 and then enters the coal gas purification chamber 7, and a dry distillation gas outlet part of the coal gas purification chamber 7 is provided with an impact type inertia large-space sedimentation dust removal device 10 to realize secondary dust removal purification of the dry distillation gas; the impact type inertia large-space sedimentation dust removal device 9 is connected with a coal gas purification system 11.
Preferably, the rotary retort 2 and the EN horizontal low-temperature retort 6 are respectively provided with a coal material inlet 12, a rotary rake for stirring coal materials is arranged in the EN horizontal low-temperature retort 6, a retort gas output hole 13 is arranged on the upper half cylinder wall of the EN horizontal low-temperature retort 6, the sieve plate dust remover 9 is arranged above the retort gas output hole 13, and low-temperature retort gas in the EN horizontal low-temperature retort 6 passes through the sieve plate dust remover 9 after coming out of the retort gas output hole 13 and then enters the gas purification chamber 7 after primary dust removal and purification.
Preferably, the impact type inertial large-space settling dust removal device 10 comprises a dust hopper 15 arranged at a dry distillation gas outlet of the gas purification chamber 7, and a plurality of baffle plates 16 which are arranged inside the dust hopper 15 and distributed in a stepped manner at intervals, wherein dust in the dust hopper 15 falls into the EN horizontal low-temperature retort 6 through a dust outlet arranged at the bottom of the dust hopper 15, and dry distillation gas in the gas purification chamber 7 is discharged from the dust hopper 15 after impacting the baffle plate 16 to realize secondary dust removal and purification, and then enters the gas purification system 11 connected with the dust hopper 15.
In this embodiment, the gas purification system 11 includes an oil-gas separation device, a gas outlet of the oil-gas separation device is connected to a purification desulfurization machine, and a liquid-oil outlet of the oil-gas separation device is connected to a tar dehydrator.
In this embodiment, a hot flue gas inlet 18 and a hot flue gas outlet 19 are respectively arranged on the rotary retort 2, the EN vertical furnace 8 and the EN horizontal low-temperature retort 6, hot flue gas channels are respectively arranged inside the rotary retort 2, the EN vertical furnace 8 and the EN horizontal low-temperature retort 6, the hot flue gas outlet 19 of the rotary retort 2 is connected with the hot flue gas inlet 18 of the EN vertical furnace 8 through a flue gas pipeline, the hot flue gas outlet 19 of the EN vertical furnace 8 is connected with the hot flue gas inlet 18 of the EN horizontal low-temperature retort 6 through a flue gas pipeline, the hot flue gas inlet 18 of the rotary retort 2 is connected with a hot blast stove 20, and the hot blast stove 20 adopts coal gas generated by the coal gas purification system 11 as fuel for generating hot flue gas.
The low-rank coal double-decomposition double-purification dry quenching system of the embodiment is further provided with a flue gas waste heat recovery and purification system 21, the flue gas waste heat recovery and purification system 21 comprises a waste heat boiler 22, a flue gas dust removal device 23, a desulfurization device 24 and a chimney 25 which are sequentially connected through a flue gas pipeline, a hot flue gas outlet 19 of the EN horizontal type low-temperature carbonization furnace 6 is connected with a hot flue gas inlet 18 of the waste heat boiler 22, and a waste heat utilization steam pipe 14 is arranged on the waste heat boiler 22.
Preferably, the drying device 1 in the first treatment system 4 is a drying furnace or a fluidized bed dryer having a built-in heating module.
Preferably, the cooling device 3 in the first treatment system 4 is a cooling furnace or a semicoke cooler.
In this embodiment, when the drying device 1 in the first treatment system 4 adopts a fluidized bed dryer, the steam pipe 14 of the exhaust-heat boiler 22 is connected to a built-in heating module of the fluidized bed dryer; when the drying device 1 in the first treatment system 4 adopts the semicoke cooler, the semicoke cooler is connected with a paddle cooler; a flue gas supply loop is led out from a flue gas pipeline of the waste heat boiler 22 and is used for providing fluidized air of the fluidized bed dryer.
Preferably, the coal used by the first treatment system 4 is pulverized coal, and the coal used by the second treatment system 5 is lump coal, small-particle coal with a diameter of 6-30 mm, or semicoke.
Preferably, a plurality of hot flue gas channels are arranged on the rotary retort 2 and arranged along the inner wall of the cylinder of the rotary retort 2, a plurality of hot flue gas channels are arranged in the EN vertical furnace 8, are vertically arranged and are distributed at intervals and communicated with each other, and a plurality of hot flue gas channels are arranged on the EN horizontal low-temperature retort 6 and are arranged along the inner wall of the cylinder of the EN horizontal low-temperature retort 6; and the coal ash after dust removal by the flue gas dust removal device 23 is conveyed into the rotary retort 2 through a pipeline.
In this embodiment, the ash blowing hole is formed in a pipeline for passing the dry distillation gas, which is connected between the rotary retort 2 and the EN vertical furnace 8, and the ash blowing hole is formed in a pipeline for passing the dry distillation gas, which is connected between the EN vertical furnace 8 and the gas purification chamber 7.
In this embodiment, a back-blowing device 26 is disposed in the gas purification chamber 7 for performing back-blowing dust removal on the screen plate dust remover 9, and the back-blowing device 26 uses purified gas processed by the gas purification system 11 as back-blowing gas.
The material flow in this example is as follows:
(1) in the first treatment system 4, after the pulverized coal enters a drying device 1 (a drying furnace or a fluidized bed dryer) for drying, the pulverized coal is sent into a rotary dry distillation furnace 2 by a screw feeder to indirectly transfer heat with high-temperature flue gas, so that dry distillation and pyrolysis are realized, the pulverized coal is changed into semicoke, and then the semicoke is sent to a cooling device 3 to generate cold semicoke;
(2) in the second treatment system 5, the coal material sequentially enters an EN horizontal low-temperature carbonization furnace 6 and an EN vertical furnace 8 to indirectly transfer heat with the high-temperature flue gas, so that carbonization and pyrolysis are realized, the coal material is changed into semicoke, and then the semicoke is sent to a cooling device 3 (a cooling furnace or a semicoke cooler) to generate cold semicoke.
The pyrolysis gas flow in this example is as follows:
(1) in the first treatment system 4, pulverized coal in the rotary retort 2 is subjected to dry distillation and pyrolysis to generate pyrolysis gas, the pyrolysis gas enters from the lower port part of the EN vertical furnace 8, upwards passes through a coal bed in the EN vertical furnace 8 to be subjected to primary dust filtration, and enters a coal gas purification chamber;
(2) in the second treatment system 5, the coal material in the EN horizontal low-temperature retort 6 is subjected to dry distillation and pyrolysis to generate pyrolysis gas, primary dust filtration is carried out through a screen plate dust remover 9, and then the pyrolysis gas enters a coal gas purification chamber 7;
(3) pyrolysis gas entering the gas purification chamber 7 is subjected to secondary dust filtration by an impact type inertia large-space sedimentation dust removal device 10 and then is output to a gas purification system 11 for oil-gas separation to generate gas and tar;
the flue gas flow in this embodiment is as follows:
the coal gas generated by the coal gas purification system 11 is sent into a hot blast stove 20 for combustion, the generated high-temperature flue gas sequentially enters hot flue gas channels 17 of a rotary retort 2, an EN vertical furnace 8 and an EN horizontal low-temperature retort 6 for indirect heat transfer, then enters a waste heat boiler 22 for heat exchange with water to about 130 ℃, then is discharged from the waste heat boiler 22, and is exhausted after dust removal and desulfurization. Wherein, part of the flue gas which is discharged from the waste heat boiler 22 can also be introduced into the drying device 1 (a drying furnace or a fluidized bed dryer) to be used as a heat source for heating and drying and be used as a fluidizing and moisture-carrying medium in the fluidized bed dryer.
In this embodiment, the EN vertical furnace and the EN horizontal low-temperature retort furnace are respectively an EN vertical furnace and an EN horizontal low-temperature retort furnace manufactured and sold by wu yan science and technology gmbh.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The low-rank coal double-decomposition double-purification dry quenching system is characterized by comprising a first treatment system and a second treatment system, wherein the first treatment system consists of a drying device, a rotary type dry distillation furnace and a cooling device which are sequentially connected, the second treatment system is used for realizing dry distillation pyrolysis, the second treatment system is connected with the first treatment system and is used for realizing gas purification and low-temperature preheating, the second treatment system comprises an EN horizontal furnace and an EN vertical furnace, the EN horizontal furnace consists of an EN horizontal low-temperature dry distillation furnace, a gas purification chamber is connected with the upper side of the EN horizontal low-temperature dry distillation furnace, the EN vertical furnace is connected with the lower side of the EN horizontal low-temperature dry distillation furnace, and coal materials in the EN horizontal low-temperature dry distillation furnace enter the interior of the EN vertical furnace from the upper end opening of the EN vertical furnace after low-temperature dry distillation and then come out from the lower end opening of the EN vertical furnace; the dry distillation gas in the rotary dry distillation furnace is conveyed to the lower port part of the EN vertical furnace through a pipeline and upwards passes through the internal coal bed of the EN vertical furnace to realize primary dust filtration, and then is conveyed into the coal gas purification chamber through the pipeline; the low-temperature dry distillation gas in the EN horizontal low-temperature dry distillation furnace enters the coal gas purification chamber after primary dust removal and purification are realized through a screen plate dust remover arranged between the EN horizontal low-temperature dry distillation furnace and the coal gas purification chamber, and a dry distillation gas outlet part of the coal gas purification chamber is provided with an impact type inertia large-space sedimentation dust removal device to realize secondary dust removal and purification of the dry distillation gas; the impact type inertial large-space sedimentation dust removal device is connected with a coal gas purification system.
2. The low-rank coal double-decomposition double-purification dry quenching system as claimed in claim 1, wherein the rotary retort and the EN horizontal low-temperature retort are respectively provided with a coal material inlet, the EN horizontal low-temperature retort is internally provided with a rotary rake for stirring coal materials, the upper half cylinder wall of the EN horizontal low-temperature retort is provided with a dry distillation gas output hole, the sieve plate dust remover is arranged above the dry distillation gas output hole, and low-temperature dry distillation gas in the EN horizontal low-temperature retort is discharged from the dry distillation gas output hole, is subjected to primary dust removal and purification through the sieve plate dust remover and then enters the coal gas purification chamber.
3. The low-rank coal double-decomposition double-purification dry quenching system as claimed in claim 1, wherein the impact type inertia large-space settling dust removal device comprises a dust hopper arranged at a dry distillation gas outlet of the coal gas purification chamber, and a plurality of baffle plates which are arranged inside the dust hopper and distributed in a stepped manner at intervals, wherein dust in the dust hopper falls into the EN horizontal low-temperature dry distillation furnace through a dust outlet arranged at the bottom of the dust hopper, and dry distillation gas in the coal gas purification chamber is discharged from the dust hopper after impacting the baffle plates to realize secondary dust removal and purification, and then enters the coal gas purification system connected with the dust hopper.
4. The low-rank coal double-decomposition double-purification dry quenching system as claimed in claim 1, wherein the gas purification system comprises an oil-gas separation device, a gas outlet of the oil-gas separation device is connected with a purification desulfurization machine, and a liquid-oil outlet of the oil-gas separation device is connected with a tar dehydrator.
5. The low-rank coal double-decomposition double-purification dry quenching system as claimed in claim 4, wherein the rotary retort, the EN vertical furnace and the EN horizontal low-temperature retort are respectively provided with a hot flue gas inlet and a hot flue gas outlet, the rotary retort, the EN vertical furnace and the EN horizontal low-temperature retort are respectively provided with a hot flue gas channel inside, the hot flue gas outlet of the rotary retort is connected with the hot flue gas inlet of the EN vertical furnace through a flue gas pipeline, the hot flue gas outlet of the EN vertical furnace is connected with the hot flue gas inlet of the EN horizontal low-temperature retort through a flue gas pipeline, the hot flue gas inlet of the rotary retort is connected with a hot blast stove, and the hot blast stove adopts coal gas generated by the coal gas purification system as fuel for generating hot flue gas.
6. The low-rank coal double-decomposition double-purification dry quenching system as claimed in claim 5, further comprising a flue gas waste heat recovery and purification system, wherein the flue gas waste heat recovery and purification system comprises a waste heat boiler, a flue gas dust removal device, a desulfurization device and a chimney which are sequentially connected through a flue gas pipeline, a hot flue gas outlet of the EN horizontal low-temperature retort is connected with a hot flue gas inlet of the waste heat boiler, and a waste heat utilization steam pipe is arranged on the waste heat boiler.
7. The low-rank coal double-decomposition double-purification dry quenching system as claimed in claim 6, wherein the drying device in the first treatment system adopts a drying furnace or a fluidized bed dryer with a built-in heating module.
8. The low-rank coal double-decomposition double-purification dry quenching system as claimed in claim 7, wherein a cooling device in the first treatment system adopts a cooling furnace or a semicoke cooler.
9. The low-rank coal double-decomposition double-purification dry quenching system as claimed in claim 8, wherein when a fluidized bed dryer is adopted as the drying device in the first treatment system, the steam pipe of the waste heat boiler is connected with a built-in heating module of the fluidized bed dryer; when the drying device in the first treatment system adopts the semicoke cooler, the semicoke cooler is connected with a blade type cooler; and a flue gas supply loop is led out from a flue gas pipeline of the waste heat boiler and is used for providing fluidized air of the fluidized bed dryer.
10. The low-rank coal double-solution double-purification dry quenching system as claimed in claim 9, wherein the coal used by the first treatment system is pulverized coal, and the coal used by the second treatment system is lump coal, small-particle coal with a diameter of 6-30 mm or semicoke; and a back-blowing device is arranged in the gas purification chamber and used for carrying out back-blowing dust removal on the screen plate dust remover, and the back-blowing device uses purified gas treated by the gas purification system as back-blowing gas.
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| CN113444532A (en) * | 2021-07-23 | 2021-09-28 | 河北领阔环保科技有限公司 | Low order coal pyrolysis purifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113444532A (en) * | 2021-07-23 | 2021-09-28 | 河北领阔环保科技有限公司 | Low order coal pyrolysis purifier |
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