CN212152188U - Lump coal pyrolysis device - Google Patents
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- CN212152188U CN212152188U CN202020559332.4U CN202020559332U CN212152188U CN 212152188 U CN212152188 U CN 212152188U CN 202020559332 U CN202020559332 U CN 202020559332U CN 212152188 U CN212152188 U CN 212152188U
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Abstract
The utility model relates to a lump coal pyrolysis device, pyrolysis device includes: the device comprises a gas supply unit, a pyrolysis unit and a fractionation unit; the gas supply unit comprises a reheating device, a waste heat recovery device, a first gas-solid separator and a coal gas heating device; the reheating device is provided with a fuel inlet, a heat medium recycling port, a heat medium outlet and a waste heat recycling port; the discharge hole of the gas heating device is connected with the feed hole of the first gas-solid separator; the slag outlet of the first gas-solid separator is connected with the heat medium recovery port; the pyrolysis unit comprises a pyrolysis part and a cooling part which are connected in sequence; the pyrolysis part comprises a drying section, a pyrolysis section and a heat recovery section which are connected in sequence; the gas outlet of the first gas-solid separator is connected with the pyrolysis section of the pyrolysis part; an oil gas outlet is formed in the upper part of the pyrolysis section; an oil gas outlet at the upper part of the pyrolysis section is connected with a feed inlet of the second gas-solid separator; the gas outlet of the second gas-solid separator is connected with the fractionating unit. The whole pyrolysis process in the device has higher efficiency and is more environment-friendly.
Description
Technical Field
The utility model relates to a coal pyrolysis field, concretely relates to lump coal pyrolysis device.
Background
At present, the reserves of low-rank coal in China are abundant and account for 55% of the total reserves of the explored coal, and with the expansion of the application range of the low-rank coal and the improvement of the mechanical mining rate of the coal, the coal pyrolysis technology taking the low-rank coal as a main object is gradually developed into a graded pyrolysis technology divided by the particle size of the coal, wherein the technology taking lump coal as a raw material mainly comprises vertical type semi-coke furnace, rotary kiln, Guofu furnace technology and the like. The technology using lump coal as raw material is continuously improved, the production efficiency is continuously improved, and the current application scale reaches tens of millions of tons for years. Lump coal pyrolysis technology is the most representative of the current semi-coke production process.
The semi-coke originates from Shenfu and surrounding areas in Shanxi province, is an important raw material for producing calcium carbide and iron-magnesium alloy, and is also an important application in blast furnace ironmaking, household heating and the like. The semi-coke production and application have very important significance for constructing a local and special industrial chain and promoting the clean and efficient utilization of coal.
The semi-coke production process is mainly an external combustion internal heating type vertical carbonization technology, and the process is developed from early wood furnaces and Lurgi three-section furnaces. In the nineties of the last century, Shenfu coal field development and Shenmu county introduced and applied vertical carbonization technology to develop large-scale semi coke production, through continuous improvement for many years, the external combustion internal heating vertical carbonization technology gradually tends to mature, and the vertical carbonization technology is widely applied due to simple process, stable operation and investment saving. For example, CN106701129A discloses a lump coal heat accumulating type pyrolysis reaction system and method, the system adopts a built-in external heating type, the heating capacity of pyrolysis gas is high, the subsequent utilization of pyrolysis gas is facilitated, the pyrolysis treatment of low-rank coal is realized, the problem that low-rank coal is fragile in the pyrolysis process is overcome, and long flame coal and lignite can be treated. CN105062526A discloses a coal pyrolysis gasification poly-generation system and a pyrolysis gasification method thereof, which have the advantages of reduced energy consumption, good environmental protection performance, good coal adaptability, convenient processing and manufacturing of equipment, elimination of potential safety hazards and improvement of effect.
Although the technology of the external combustion internal heating vertical carbonization furnace is widely applied, the production process of the semi-coke still has a lot of problems due to the simple and extensive production process. The main problems of the vertical carbonization technology are high inert gas content of pyrolysis gas and low heat value of the gas; the pyrolysis wastewater has large yield, various pollutant types and difficult treatment; the semi coke cooling generally adopts water quenching, the heat efficiency is low, and the product quality is poor; the tar yield is low, the heavy component content is high, and the subsequent processing is not facilitated.
SUMMERY OF THE UTILITY MODEL
In view of the problems existing in the prior art, the utility model aims to provide a lump coal pyrolysis device, the utility model provides a device does not contain because of the combustion-supporting N that produces of air as the coal gas of carrier gas because high temperature coal gas energy comes from the heat transfer of solid heat carrier2CO and CO2And the heat value of the coal gas produced in the pyrolysis process is increased, the quality is greatly improved, and the efficiency of the whole pyrolysis process is improved and the whole pyrolysis process is more environment-friendly.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a lump coal pyrolysis device, pyrolysis device includes: the device comprises a gas supply unit, a pyrolysis unit and a fractionation unit;
the gas supply unit comprises a reheating device, a waste heat recovery device, a first gas-solid separator and a coal gas heating device;
the reheating device is provided with a fuel inlet, a heat medium recovery port, a heat medium outlet and a waste heat recovery port;
the waste heat recovery port of the reheating device is connected with the waste heat recovery device;
the heat medium outlet is connected with the feed inlet of the coal gas heating device;
the discharge hole of the coal gas heating device is connected with the feed hole of the first gas-solid separator;
the slag outlet of the first gas-solid separator is connected with the heat medium recovery port;
the pyrolysis unit comprises a pyrolysis part, a cooling part and a second gas-solid separator which are sequentially connected;
the pyrolysis part comprises a drying section, a pyrolysis section and a heat recovery section which are connected in sequence;
the waste heat recovery device is connected with the drying section of the pyrolysis part;
the gas outlet of the first gas-solid separator is connected with the pyrolysis section of the pyrolysis part;
the cooling part is connected with the conveying device;
an oil gas outlet is formed in the upper part of the pyrolysis section;
an oil gas outlet at the upper part of the pyrolysis section is connected with a feed inlet of the second gas-solid separator;
and the gas outlet of the second gas-solid separator is connected with the fractionation unit.
The utility model provides a lump coal pyrolysis new installation of coupling fluidization heating, the device heat pyrolysis coal gas through the solid heat carrier of coupling circulation fluidization, and the high temperature coal gas after the heating carries out the pyrolysis as gas heat carrier to raw materials coal. Because the energy of the high-temperature coal gas comes from the heat exchange of the solid heat carrier, the coal gas used as the carrier gas does not contain N generated by air combustion supporting2CO and CO2And the gas is mixed, so that the heat value of the gas produced in the pyrolysis process is increased, the quality is greatly improved, the whole pyrolysis process is promoted to be higher in efficiency and more environment-friendly, and meanwhile, the process has the advantages of high heat value of the gas, less sewage, full energy utilization and the like, and the whole pyrolysis process is higher in efficiency and more environment-friendly.
As the preferable technical proposal of the utility model, the raw material lump coal is fed from the drying section;
the drying section is connected with a feeding port of the third gas-solid separator;
the gas outlet of the third gas-solid separator is connected with the feed inlet of the first cooler;
the discharge hole of the first cooler is connected with a first liquid separation tank;
the first liquid separation tank is provided with a smoke outlet and a condensed water outlet.
As the preferable technical proposal of the utility model, the bottom of the reheating device is also connected with an auxiliary combustion furnace.
As the preferable technical proposal of the utility model, the gas heating device comprises a mixing heating pipe and/or a fluidized heater;
the cooling section comprises a circulating convection cooler;
the circulating convection cooler is provided with at least 2.
As a preferred technical solution of the present invention, the fractionating unit includes a fractionating tower;
and the gas outlet of the second gas-solid separator is connected with the lower part of the fractionating tower.
As the preferable technical proposal of the utility model, the top of the fractionating tower is connected with the air inlet of the second cooler;
the discharge hole of the second cooler is connected with the feed inlet of the second liquid separation tank;
the second branch liquid tank is provided with a light oil outlet, a coal gas outlet and a sewage outlet.
As the preferable technical proposal of the utility model, the upper part of the fractionating tower is provided with a phenol-containing light oil outlet and a light oil inlet;
the phenol-containing light oil outlet is connected with a feed inlet of the on-line phenol extraction device;
the oil outlet of the on-line phenol extracting device is connected with a light oil inlet arranged at the upper part of the fractionating tower;
and a light oil outlet of the second liquid separation tank is connected with a light oil inlet arranged at the upper part of the fractionating tower.
As the preferable technical proposal of the utility model, the bottom of the fractionating tower is connected with a first liquid pump in sequence;
the first liquid pump is provided with a first liquid outlet and a second liquid outlet;
the first liquid outlet is connected with a coal tar inlet at the lower part of the fractionating tower;
and the second liquid outlet is connected with the feed inlet of the centrifugal machine.
As the preferable technical proposal of the utility model, the liquid outlet of the centrifuge is connected with the middle part of the flash tower;
the bottom of the flash tower is connected with a second liquid pump;
the top of the flash tower is connected with the feed inlet of the centrifuge.
As the preferable technical proposal of the utility model, the heat recovery section comprises a steam generator and a gas inlet which are arranged outside;
the gas inlet of the gas heating device and the gas inlet of the heat recovery section are connected with the gas outlet of the second liquid separation tank connecting fan;
the reheating device comprises a reheater;
the conveying device comprises a conveying belt.
In the utility model, the solid heat carrier after fluidized heating heats the heat carrier coal gas, and the heated coal gas is used as the gas heat carrier to pyrolyze the raw material lump coal;
wherein the raw material lump coal is low-rank lump coal; the granularity of the raw material lump coal is 6-80 mm; drying the raw material lump coal before pyrolysis; the temperature of the drying gas in the drying treatment is 100-300 ℃; the wet flue gas formed in the drying treatment is subjected to dust removal and condensation to recover condensed water; the temperature of the wet flue gas is 50-150 ℃; the heat source of the drying treatment is the waste heat recovered in the coal gas heating process; the pyrolysis is countercurrent pyrolysis; the pyrolysis is carried out to obtain semicoke and oil gas; the temperature of the oil gas is 250-350 ℃; the pyrolysis is also provided with heat recovery operation; introducing the oil gas subjected to dust removal into a fractionating tower for fractionating; the dust removal equipment comprises a gas-solid separator; introducing the oil gas through the lower part of the fractionating tower; the oil gas enters a fractionating tower and is washed by coal tar to cool and exchange heat to 100-120 ℃; the coal tar used for washing is extracted from the bottom of the fractionating tower, 50-80% of the coal tar is returned to the bottom of the fractionating tower for circular washing after cooling and dedusting operation, the rest part of the coal tar is heated and then enters the flash tower, and before the coal tar at the top of the flash tower returns to the dedusting operation, the coal tar at the bottom of the flash tower is output as a product; the cooled oil gas is separated from the top of the fractionating tower; separating the cooled oil gas to obtain light oil, water and coal gas; the light oil returns to the fractionating tower; 80-95% of the coal gas is returned as heat carrier coal gas, and the rest is used as a product; the fractionation also comprises the extraction of light oil containing phenol from the 170-210 ℃ section of the fractionation tower; extracting phenol from the phenol-containing light oil to obtain dephenolized light oil and crude phenol; returning the dephenolized light oil to the fractionating tower; the content of phenol in the water is less than 1500ppm, and the content of oil is less than 800 ppm; the semicoke obtained by pyrolysis is sent to a coke plant after three-stage cooling treatment; the third-stage cooling comprises cooling of a water wall tube, circulating convection cooling and water spray cooling which are sequentially carried out; the pressure of steam in the heat exchange tube after heat exchange in the cooling of the water wall tube is 0.5-1 MPa; the temperature of the semicoke after the water wall tube is cooled is 350-450 ℃; a cold gas injection port is arranged at the cooling lower part of the water wall pipe, and the cold gas and the semicoke are subjected to heat exchange and temperature rise and then enter a pyrolysis section to be mixed with heat carrier gas; the cooling carrier in the circulating convection cooling is inert gas; the temperature of the semicoke after the circulating convection cooling is 100-180 ℃; the water spraying cooling mode is water mist cooling; the temperature of the semicoke after water spraying and cooling is less than 70 ℃; the heat carrier gas is pressurized before being heated; the solid heat carrier heats the heat carrier coal gas in the mixing heating pipe and/or the fluidizing heater; the temperature of the heated coal gas is 600-800 ℃; after the coal gas is heated, the coal gas is separated from the solid heat carrier through a separator; the separator is a gas-solid separator; reheating the solid heat carrier obtained by separation; in the reheating process, air is introduced for combustion to remove coke formed on the surface of the solid heat carrier when the heat carrier gas is heated, and reheating is realized; the reheating is carried out in a reheating device; the reheating can also be realized by supplementing heavy fuel or heat medium for heat exchange; flue gas is formed in the reheating process; the flue gas is treated by a waste heat recovery system and then is used as a drying gas in drying treatment; the temperature of the flue gas is 500-1000 ℃.
The utility model discloses in, the equipment of dust removal includes cyclone, sieve and/or the container of baffle, high temperature bag collector and electricity bag dust remover etc. but not limited to the equipment listed, other equipment that can reach same effect also can. Further, the utility model discloses well semicoke can be through the heat recovery operation before the cooling to retrieve the high energy heat that the semicoke was taken, the heat of retrieving can be used as other places heating and use such as electricity generation usefulness.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
(1) in the utility model, because the energy of the high-temperature coal gas comes from the heat exchange of the solid heat carrier, the coal gas as the carrier gas does not contain N generated by air combustion supporting2CO and CO2Wait gaseous, promptly the utility model provides an advantage such as technology coal gas calorific value is high, the sewage volume is few, energy utilization is abundant, and whole pyrolysis process efficiency is higher, environmental protection more.
(2) The utility model discloses in, through dephenolization on line to the oil reflux, the phenol-containing of control top of the tower waste water is less than 1500ppm, the oiliness is less than 800ppm, reduces the waste water treatment degree of difficulty by a wide margin.
(3) The utility model discloses in, carry out drying process before carrying out the pyrolysis through increasing raw materials lump coal, can reduce the waste water volume that the pyrolysis produced to 1/2-1/3 of traditional blue charcoal technique.
Drawings
FIG. 1 is a schematic diagram of a lump coal pyrolysis apparatus provided by the present invention;
in the figure: 1-reheating device, 2-waste heat recovery device, 3-first gas-solid separator, 4-gas heating device, 5-auxiliary combustion furnace, 6-drying section, 7-pyrolysis section, 8-heat recovery section, 9-cooling part, 10-conveying device, 11-third gas-solid separator, 12-first cooler, 13-first liquid separation tank, 14-second gas-solid separator, 15-fractionating tower, 16-second cooler, 17-second liquid separation tank, 18-online phenol extraction device, 19-first liquid pump, 20-centrifuge, 21-flash tower, 22-second liquid pump and 23-steam generator.
The present invention will be described in further detail below. However, the following examples are only simple examples of the present invention, and do not represent or limit the scope of the present invention, which is defined by the appended claims.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
To better illustrate the present invention, facilitating the understanding of the technical solutions of the present invention, typical but not limiting embodiments of the present invention are as follows:
examples
This embodiment provides a lump coal pyrolysis apparatus, as shown in fig. 1, the pyrolysis apparatus includes: the device comprises a gas supply unit, a pyrolysis unit and a fractionation unit;
the gas supply unit comprises a reheating device 1, a waste heat recovery device 2, a first gas-solid separator 3 and a coal gas heating device 4;
the reheating device 1 is provided with a fuel inlet, a heat medium recovery port, a heat medium outlet and a waste heat recovery port;
the waste heat recovery port of the reheating device 1 is connected with the waste heat recovery device 2;
the heat medium outlet is connected with the feed inlet of the coal gas heating device 4;
the discharge hole of the coal gas heating device 4 is connected with the feed hole of the first gas-solid separator 3;
the slag outlet of the first gas-solid separator 3 is connected with the heat medium recovery port;
the pyrolysis unit comprises a pyrolysis part, a cooling part and a second gas-solid separator 9 which are connected in sequence;
the pyrolysis part comprises a drying section 6, a pyrolysis section 7 and a heat recovery section 8 which are connected in sequence;
the waste heat recovery device 2 is connected with the drying section 6 of the pyrolysis part;
the gas outlet of the first gas-solid separator 3 is connected with the pyrolysis section 7 of the pyrolysis part;
the cooling part 9 is connected with a conveying device 10;
an oil gas outlet is formed in the upper part of the pyrolysis section 7;
an oil gas outlet at the upper part of the pyrolysis section 7 is connected with a feed inlet of the second gas-solid separator 14;
the outlet of the second gas-solid separator 14 is connected to the fractionation unit.
Further, raw lump coal is fed from the drying section 6; the drying section 6 is connected with a feeding port of a third gas-solid separator 11; the gas outlet of the third gas-solid separator 11 is connected with the feed inlet of the first cooler 12; the discharge port of the first cooler 12 is connected with a first liquid separation tank 13; the first liquid separation tank 13 is provided with a smoke outlet and a condensed water outlet.
Further, an auxiliary combustion furnace 5 is connected to the bottom of the reheating device 1.
Further, the gas heating device 4 comprises a mixing heating pipe and/or a fluidizing heater; the cooling section 9 comprises a circulating convection cooler; the circulating convection cooler is provided with at least 2.
Further, the fractionation unit includes a fractionation column 15; the outlet of the second gas-solid separator 14 is connected to the lower part of the fractionation column 15.
Further, the top of the fractionating tower 15 is connected with the gas inlet of the second cooler 16; the discharge hole of the second cooler 16 is connected with the feed inlet of a second liquid separation tank 17; the second branch liquid tank 17 is provided with a light oil outlet, a coal gas outlet and a sewage outlet.
Further, the upper part of the fractionating tower 15 is provided with a phenol-containing light oil outlet and a light oil inlet; the phenol-containing light oil outlet is connected with a feed inlet of the on-line phenol extracting device 18; the oil outlet of the on-line phenol extracting device 18 is connected with a light oil inlet arranged at the upper part of the fractionating tower 15; and a light oil outlet of the second separation liquid tank 17 is connected with a light oil inlet arranged at the upper part of the fractionating tower 15.
Further, a first liquid pump 19 is sequentially connected to the bottom of the fractionating tower 15; the first liquid pump is provided with a first liquid outlet and a second liquid outlet; the first liquid outlet is connected with a coal tar inlet at the lower part of the fractionating tower; the second liquid outlet is connected with the feed inlet of the centrifuge 20.
Further, a liquid outlet of the centrifuge 20 is connected with a tower in the flash tower 21; the bottom of the flash tower 21 is connected with a second liquid pump 22; the top of the flash column 21 is connected to the feed inlet of the centrifuge 20.
Further, the heat recovery section 8 comprises an externally arranged steam generator 23 and a gas inlet; the gas inlet of the gas heating device 4 and the gas inlet of the heat recovery section 8 are connected with the gas outlet of the fan connected with the second liquid separation tank 17; the reheating device 1 comprises a reheater; the conveyor 10 comprises a conveyor belt.
The utility model discloses in, the solid heat carrier through the coupling circulation fluidization heats pyrolysis coal gas, and the high temperature coal gas after the heating carries out the pyrolysis as gas heat carrier to raw materials coal. Because the energy of the high-temperature coal gas comes from the heat exchange of the solid heat carrier, the coal gas used as the carrier gas does not contain N generated by air combustion supporting2CO and CO2And the heat value of the coal gas produced in the pyrolysis process is increased, the quality is greatly improved, and the efficiency of the whole pyrolysis process is improved and the whole pyrolysis process is more environment-friendly. Meanwhile, the phenol content of the tower top wastewater is controlled to be less than 1500ppm and the oil content is controlled to be less than 800ppm by carrying out online dephenolization on the reflux oil, so that the wastewater treatment difficulty is greatly reduced.
The applicant states that the present invention is described by the above embodiments, but the present invention is not limited to the above detailed structural features, i.e. the present invention can be implemented only by relying on the above detailed structural features. It should be clear to those skilled in the art that any modifications to the present invention, to the equivalent replacement of selected parts and the addition of auxiliary parts, the selection of specific modes, etc., all fall within the scope of protection and disclosure of the present invention.
The above detailed description describes the preferred embodiments of the present invention, but the present invention is not limited to the details of the above embodiments, and the technical idea of the present invention can be within the scope of the present invention, and can be right to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.
In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.
Claims (10)
1. A lump coal pyrolysis apparatus, comprising: the device comprises a gas supply unit, a pyrolysis unit and a fractionation unit;
the gas supply unit comprises a reheating device, a waste heat recovery device, a first gas-solid separator and a coal gas heating device;
the reheating device is provided with a fuel inlet, a heat medium recovery port, a heat medium outlet and a waste heat recovery port;
the waste heat recovery port of the reheating device is connected with the waste heat recovery device;
the heat medium outlet is connected with the feed inlet of the coal gas heating device;
the discharge hole of the coal gas heating device is connected with the feed hole of the first gas-solid separator;
the slag outlet of the first gas-solid separator is connected with the heat medium recovery port;
the pyrolysis unit comprises a pyrolysis part, a cooling part and a second gas-solid separator which are sequentially connected;
the pyrolysis part comprises a drying section, a pyrolysis section and a heat recovery section which are connected in sequence;
the waste heat recovery device is connected with the drying section of the pyrolysis part;
the gas outlet of the first gas-solid separator is connected with the pyrolysis section of the pyrolysis part;
the cooling part is connected with the conveying device;
an oil gas outlet is formed in the upper part of the pyrolysis section;
an oil gas outlet at the upper part of the pyrolysis section is connected with a feed inlet of the second gas-solid separator;
and the gas outlet of the second gas-solid separator is connected with the fractionation unit.
2. The lump coal pyrolysis device of claim 1, wherein raw lump coal is fed from the drying section;
the drying section is connected with a feeding port of the third gas-solid separator;
the gas outlet of the third gas-solid separator is connected with the feed inlet of the first cooler;
the discharge hole of the first cooler is connected with a first liquid separation tank;
the first liquid separation tank is provided with a smoke outlet and a condensed water outlet.
3. The lump coal pyrolysis device of claim 1, wherein an auxiliary burner is further connected to a bottom of the reheating device.
4. The lump coal pyrolysis device of claim 1, wherein the gas heating device comprises a hybrid heating pipe and/or a fluidized heater;
the cooling section comprises a circulating convection cooler;
the circulating convection cooler is provided with at least 2.
5. The lump coal pyrolysis device of claim 1, wherein the fractionation unit comprises a fractionation column;
and the gas outlet of the second gas-solid separator is connected with the lower part of the fractionating tower.
6. The lump coal pyrolysis device of claim 5, wherein the top of the fractionating tower is connected to the inlet of the second cooler;
the discharge hole of the second cooler is connected with the feed inlet of the second liquid separation tank;
the second branch liquid tank is provided with a light oil outlet, a coal gas outlet and a sewage outlet.
7. The lump coal pyrolysis device of claim 6, wherein the fractionating tower is provided at an upper portion thereof with a phenol-containing light oil outlet and a light oil inlet;
the phenol-containing light oil outlet is connected with a feed inlet of the on-line phenol extraction device;
the oil outlet of the on-line phenol extracting device is connected with a light oil inlet arranged at the upper part of the fractionating tower;
and a light oil outlet of the second liquid separation tank is connected with a light oil inlet arranged at the upper part of the fractionating tower.
8. The lump coal pyrolysis device of claim 5, wherein a first liquid pump is connected to the bottom of the fractionating tower in sequence;
the first liquid pump is provided with a first liquid outlet and a second liquid outlet;
the first liquid outlet is connected with a coal tar inlet at the lower part of the fractionating tower;
and the second liquid outlet is connected with the feed inlet of the centrifugal machine.
9. The lump coal pyrolysis device of claim 8, wherein the liquid outlet of the centrifuge is connected to a column of the flash tower;
the bottom of the flash tower is connected with a second liquid pump;
the top of the flash tower is connected with the feed inlet of the centrifuge.
10. The lump coal pyrolysis device of claim 7, wherein the heat recovery section comprises an externally disposed steam generator and a gas inlet;
the gas inlet of the gas heating device and the gas inlet of the heat recovery section are connected with the gas outlet of the fan connected with the second liquid separation tank;
the reheating device comprises a reheater;
the conveying device comprises a conveying belt.
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| CN202020559332.4U CN212152188U (en) | 2020-04-15 | 2020-04-15 | Lump coal pyrolysis device |
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| CN202020559332.4U CN212152188U (en) | 2020-04-15 | 2020-04-15 | Lump coal pyrolysis device |
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