CN108659890B - Separation device and separation method for dust, coal tar and coal gas after pyrolysis of pulverized coal - Google Patents
Separation device and separation method for dust, coal tar and coal gas after pyrolysis of pulverized coal Download PDFInfo
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- CN108659890B CN108659890B CN201810670440.6A CN201810670440A CN108659890B CN 108659890 B CN108659890 B CN 108659890B CN 201810670440 A CN201810670440 A CN 201810670440A CN 108659890 B CN108659890 B CN 108659890B
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- 238000000926 separation method Methods 0.000 title claims abstract description 69
- 239000003245 coal Substances 0.000 title claims abstract description 45
- 239000011280 coal tar Substances 0.000 title claims abstract description 45
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 44
- 239000000428 dust Substances 0.000 title claims abstract description 40
- 239000003034 coal gas Substances 0.000 title claims abstract description 33
- 229910052751 metal Inorganic materials 0.000 claims abstract description 198
- 239000002184 metal Substances 0.000 claims abstract description 198
- 239000007787 solid Substances 0.000 claims description 16
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- 238000002309 gasification Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
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- UJOBWOGCFQCDNV-UHFFFAOYSA-N 9H-carbazole Chemical compound C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 2
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- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/024—Dust removal by filtration
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/026—Dust removal by centrifugal forces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses a separation device and a separation method for dust, coal tar and coal gas after pyrolysis of pulverized coal, wherein the separation device comprises a first air inlet and outlet channel, a second air inlet and outlet channel and a plurality of combined sieve plates, and each combined sieve plate is provided with an inlet and an outlet; the combined screen plate comprises a metal plate frame, a metal coil and a metal screen, wherein the metal plate frame is of a frame structure with an inlet, an outlet and side walls, the inlets of all the metal plate frames are communicated with the first air inlet and outlet channels, the outlets of all the metal plate frames are communicated with the second air inlet and outlet channels, and a plurality of metal screens are arranged in the metal plate frame; the mesh number of the metal screen mesh is increased along the direction from the inlet to the outlet of the metal plate frame; the metal coil is arranged on the side wall of the metal plate frame. The device has the functions of separating and dedusting (separating and dedusting chamber) and back-blowing purification (back-blowing purification chamber) so as to realize the separation of solid products and the function regeneration of the device.
Description
Technical Field
The invention belongs to the field of coal pyrolysis, in particular to the field of pyrolysis product separation, and particularly relates to a separation device and a separation method for dust, coal tar and coal gas after pulverized coal pyrolysis.
Background
Petroleum, coal and natural gas are main primary energy sources in the world, coal resources are taken as solid fossil fuels, and occupy important positions in the energy structure of China, and from the aspect of primary energy resource reserve distribution of China, china is in the energy distribution situation of 'lean oil, rich coal and less gas'. Coal is the fossil energy source with the highest carbon content and is also an important chemical raw material. The coal has complex and various component structures, the hydrocarbon ratio is about 1:0.8, and the components not only have long-chain and polycyclic organic matters, but also have inorganic matters such as mineral ash and the like which are difficult to decompose. The chemical bond in the coal has higher energy, is difficult to break and open, and the structure is mainly split at high temperature at present, namely the thermal processing technology of the coal.
The coal pyrolysis technology is a series of complex structures and physical and chemical changes of components, which occur when coal is heated and decomposed under the condition of isolating air or inert atmosphere, and particularly relates to reactions such as coal pyrolysis, gasification, polymerization and the like, and the generated products mainly comprise coke/semicoke, coal tar and coal gas. Coke is an important raw material in metallurgical industry such as iron and steel, and 'triphenyl', anthracene, naphthalene, carbazole, quinoline, thiophene and the like in coal tar are important chemical raw materials, and hydrogen, methane and carbon monoxide in coal gas are high in content, so that the coke can be used as raw materials of high-heat-value coal gas or synthetic ammonia. In the way of processing and utilizing coal resources in China, although the research and application of the medium-low temperature pyrolysis technology of coal are relatively wide and mature, various pyrolysis technologies are developed and applied, the technical problems of low pyrolysis efficiency, low product yield, difficult separation of products, difficult treatment of wastewater and the like still exist.
At present, the existing separation methods of the pyrolysis products of the coal comprise cyclone separation, cloth bag dust collection, electrical tar capture and the like, but as dust is wrapped by coal tar, the conventional method can not completely separate the coal tar and the dust.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a separation device and a separation method for dust, coal tar and coal gas after pyrolysis of pulverized coal.
In order to achieve the above purpose, the present invention is realized by adopting the following technical scheme.
The device for separating dust from coal tar and coal gas after pyrolysis of pulverized coal comprises a first air inlet and outlet channel, a second air inlet and outlet channel and a plurality of combined sieve plates, wherein each combined sieve plate is provided with an inlet and an outlet;
the combined screen plate comprises a metal plate frame, a metal coil and a metal screen, wherein the metal plate frame is of a frame structure with an inlet, an outlet and side walls, the inlets of all the metal plate frames are communicated with the first air inlet and outlet channels, the outlets of all the metal plate frames are communicated with the second air inlet and outlet channels, and a plurality of metal screens are arranged in the metal plate frame; the mesh number of the metal screen mesh is increased along the direction from the inlet to the outlet of the metal plate frame; the metal coil is arranged on the side wall of the metal plate frame.
All the metal screens are divided into a plurality of metal screen groups, and the mesh numbers of the metal screens in each metal screen group are the same; each metal screen group comprises three single-layer metal screens, and the three single-layer metal screens are arranged in a Z-shaped structure; the axis of the inlet and outlet directions of each single-layer metal screen and the metal plate frame are included angles of non-90 degrees.
The mesh numbers of the metal screen mesh are sequentially 120 meshes, 140 meshes, 170 meshes and 200 meshes and are gradually increased along one end to the other end of the metal plate frame.
And welding between the metal screen and the metal plate frame.
The metal coil is spirally coiled on the side wall of the metal plate frame along one end to the other end of the metal plate frame.
When the cross section of the metal plate frame is rectangular, the metal coil is arranged in a continuous S-shaped or zigzag detour on each side wall of the metal plate frame.
The inlet and outlet of the metal coil pipe are respectively arranged at two ends of the metal plate frame.
The lateral wall of the metal plate frame is provided with a sandwich structure, and the metal coil is arranged in the sandwich layer.
The metal coil is tightly attached to the interlayer wall.
The separation method of dust, coal tar and coal gas after pyrolysis of powdered coal comprises the following steps of introducing a high-temperature medium into a metal coil, heating a metal screen to above 300 ℃, introducing mixed gas after pyrolysis of powdered coal into an inner cavity of a metal plate frame from a first air inlet and outlet channel, heating the mixed gas in the inner cavity of the metal plate frame, gasifying coal tar in the heated mixed gas, filtering solid particles by the metal screen when the mixed gas passes through the metal screen, and degassing coal tar gas and coal gas generated by gasification of the coal tar by the metal screen and discharging the mixed gas from an outlet of the metal plate frame through a second air inlet and outlet channel;
when the pressure drop from the first air inlet and outlet channel to the second air inlet and outlet channel is increased, stopping introducing the mixed gas after pulverized coal pyrolysis; and then introducing purified gas into the inner cavity of the metal plate frame from the second air inlet and outlet channel, so that solid particles on the metal screen are separated from the metal screen, and the separated solid particles are discharged from the inlet of the metal plate frame through the first air inlet and outlet channel.
The flow direction of the mixed gas after the pyrolysis of the pulverized coal is opposite to the flow direction of the high-temperature medium in the metal coil.
The invention has the following beneficial effects:
according to the separating device, the high-temperature medium is introduced into the metal coil pipe, so that the inner cavity of the metal plate frame and the metal screen mesh can be heated; when the mixed gas after the pulverized coal pyrolysis is introduced into the inner cavity of the metal plate frame from the inlet, the mixed gas is heated in the inner cavity of the metal plate frame, coal tar in the heated mixed gas is gasified, and when the mixed gas passes through the metal screen, the mesh number of the metal screen is increased along the direction from the inlet to the outlet of the metal plate frame, solid particles in the mixed gas can be filtered step by the metal screen in the arranging mode of the metal screen, the metal screen is not easy to be blocked by the step by step filtration, the separation time of the separation device can be prolonged, and coal tar gas and coal gas generated by the coal tar gasification are degassed through the metal screen and flow out from the outlet, so that the separation and purification of the mixed gas after the pulverized coal pyrolysis are realized;
in the separation and purification process, when the pressure drop of the separation device from the first air inlet and outlet channel to the second air inlet and outlet channel is increased, stopping introducing the mixed gas after pyrolysis of pulverized coal from the inlet; and then the purifying gas is introduced into the inner cavity of the metal plate frame from the outlet, so that the solid particles on the metal screen are separated from the metal screen, and the separated solid particles are discharged from the inlet.
Furthermore, the axes of the inlet and outlet directions of the metal screen mesh and the metal plate frame of each single layer are included angles other than 90 degrees, namely, the metal screen mesh of each single layer is obliquely arranged in the metal plate frame, so that solid particles at the separation position can be prevented from being deposited on the metal screen mesh.
The effect of the separation device can be known that the separation method can effectively separate dust in the mixed gas after pyrolysis of the pulverized coal from coal tar and coal gas; when the pressure drop in the separation device is increased, the purpose of cleaning the separation device can be achieved by back blowing the separation device, so that the separation dust removal function of the separation device is regenerated, the separation can be carried out relatively continuously, and the separation efficiency is improved.
Further, the flow direction of the mixed gas after the pulverized coal pyrolysis is opposite to the flow direction of the high-temperature medium in the metal coil, so that the temperature difference in the direction from the outlet to the inlet of the separation device is small, and the phenomenon that dust in the mixed gas, coal tar and coal gas are incompletely separated due to the fact that the local temperature is low can be prevented.
Drawings
FIG. 1 is a schematic view of a separation apparatus of the present invention;
FIG. 2 is a schematic view of a plate and frame structure in a separation device according to the present invention;
FIG. 3 is a schematic view of the structure of a metal screen pack in the separation apparatus of the present invention;
FIG. 4 is a schematic view of the structure of the separation device of the present invention after combining all metal screens;
FIG. 5 is a schematic view of the structure of a composite screen panel in the separation apparatus of the present invention;
FIG. 6 is a schematic diagram of the operation of the separation device of the present invention as a separation dust chamber;
FIG. 7 is a schematic diagram of the operation of the separation device of the present invention as a blowback clean room.
In the figure, 1-first air inlet and outlet channels, 1-1-second air inlet and outlet channels, 2-high temperature gas inlet header pipes, 3-high temperature gas outlet header pipes, 4-metal plate frames, 5-metal coils, 6-metal screens with different meshes, 7-high temperature gas inlet pipelines, 8-high temperature gas outlet pipelines and 9-combined screen plates.
Detailed Description
The following detailed description of specific embodiments of the invention is provided in connection with the accompanying drawings and examples in order to provide a better understanding of the invention and its various aspects and advantages.
The device for separating dust from coal tar and coal gas after pyrolysis of pulverized coal, shown in fig. 1, comprises a first air inlet and outlet channel 1, a second air inlet and outlet channel 1-1 and a plurality of combined sieve plates 9, wherein each combined sieve plate 9 is provided with an inlet and an outlet;
referring to fig. 2 to 5, the combined screen plate 9 includes a metal plate frame 4, a metal coil 5 and a metal screen 6, the metal plate frame 4 is a frame structure having an inlet, an outlet and side walls, the metal coil 5 is disposed on the side walls of the metal plate frame 4, the inlets and outlets of the metal coil 5 are respectively disposed at two ends of the metal plate frame 4 (see fig. 2), the inlets of all the metal plate frames 4 are communicated with the first air inlet and outlet channel 1, the outlets of all the metal plate frames 4 are communicated with the second air inlet and outlet channel 1-1 (see fig. 1), the metal screen 6 is disposed in plurality and disposed in the metal plate frame 4 (see fig. 5), and the metal screen 6 is welded with the metal plate frame 4; the mesh number of the metal screen 6 increases in the inlet-to-outlet direction of the metal plate frame 4 (see fig. 4);
referring to fig. 1, all inlets of the metal coil 5 (i.e., the high temperature gas inlet pipe 7) are in communication with the high temperature gas inlet manifold 2, and all outlets of the metal coil 5 (i.e., the high temperature gas outlet pipe 8) are in communication with the high temperature gas outlet manifold 3.
As shown in fig. 4 and 3, all the metal screens 6 are divided into a plurality of metal screen groups, and the mesh numbers of the metal screens 6 in each metal screen group are the same; each metal screen group comprises three single-layer metal screens 6, and the three single-layer metal screens 6 are arranged in a Z-shaped structure (see figure 3); the axis of the inlet and outlet directions of each single-layer metal screen 6 and the metal plate frame 4 are included at an angle of not 90 degrees (see fig. 5-7).
As shown in fig. 4, the mesh number of the metal screen 6 is preferably gradually increased from 120 mesh, 140 mesh, 170 mesh and 200 mesh along one end to the other end of the metal plate frame 4.
Referring to fig. 2, preferably, the metal coil 5 is spirally coiled on the side wall of the metal plate frame 4 along one end to the other end of the metal plate frame 4; also, preferably, when the cross section of the metal plate frame 4 is rectangular, the metal coil 5 is continuously provided in a zigzag or S-shaped detour on each side wall of the metal plate frame 4.
Preferably, the side wall of the metal plate frame 4 is provided with a sandwich structure, the metal coil 5 is arranged in the sandwich layer, the metal coil 5 is clung to the sandwich wall, and the sandwich wall is made of metal material easy to transfer heat and has the thickness of 2mm; the metal coil pipe 5 is made of high temperature resistant metal pipe by bending, and the pipeline specification is
When the coal tar exists in a high-temperature environment in the form of coal tar gas, the solid-gas separation device can be used for separating trace solid particles in the mixed gas, and then liquid-gas products are further separated. The process of separating dust from coal tar and coal gas after pyrolysis of pulverized coal by the separation device of the invention is as follows (refer to fig. 1 to 7):
the high-temperature medium is introduced into the metal coil 5 through the high-temperature gas inlet header pipe 2 to heat the whole separation device, when the temperature of the metal screen 6 reaches more than 300 ℃, mixed gas obtained after pyrolysis of pulverized coal is introduced into the inner cavity of the metal plate frame 4 from the first air inlet and outlet channel 1, the mixed gas is heated in the inner cavity of the metal plate frame 4, coal tar in the heated mixed gas is gasified, when the mixed gas passes through the metal screen 6, solid particles are filtered by the metal screen 6, coal tar vapor and coal gas generated by gasification of the coal tar are degassed through the metal screen, and are discharged from the outlet of the metal plate frame 4 through the second air inlet and outlet channel 1-1;
when the pressure drop from the first air inlet and outlet channel 1 to the second air inlet and outlet channel 1-1 is increased, the mixed gas after pyrolysis of pulverized coal is stopped being introduced, and then the purifying gas is introduced into the inner cavity of the metal plate frame 4 from the second air inlet and outlet channel 1-1, so that the solid particles on the metal screen 6 are separated from the metal screen 6, and the separated solid particles are discharged from the inlet of the metal plate frame 4 through the first air inlet and outlet channel 1.
Preferably, during the separation process, the flow direction of the mixture after pyrolysis of the pulverized coal in the single combined screen plate 9 is reversed to the flow direction of the high-temperature medium in the metal coil 5.
In the invention, high-temperature gas is adopted as a high-temperature medium, the temperature is above 350 ℃, the high-temperature gas passes through a metal coil pipe and heats a metal screen to above 300 ℃, the mixed gas containing coke powder, coal tar gas and coal gas is heated, coal tar in the mixed gas is gasified, solid particles are clamped on the metal screen, and the coal tar gas and the coal gas pass through a gas and liquid separation section of the metal screen, so that the separation and purification functions of the separation device are realized. When the pressure drop of the separation device from the first air inlet and outlet channel 1 to the second air inlet and outlet channel 1-1 is increased, purified coal gas is reversely blown into the separation device, and solid products clamped on the screen mesh are blown out of the separation device, so that the separation dust removal function of the separation device is regenerated.
As shown in fig. 6, the mixed gas containing the coke powder, the coal tar gas and the coal gas enters from the lower part (i.e. inlet) of the metal plate frame 4, and escapes from the upper part (i.e. outlet), and the process is a dust removal and separation process; as shown in fig. 7, the back-blowing air enters from the upper part (i.e., outlet) of the metal plate frame 4, and escapes from the lower part (i.e., inlet).
Referring to fig. 1, in the structure of the two separating devices according to the present invention, the two separating devices are a separating device a and a separating device B, which are symmetrically disposed in left and right, and when dust removal is performed, a small amount of mixed pyrolysis gas mixed with dust from primary cyclone separation is removed through the separating device a, the separating device a is used as a separating dust chamber, and coal tar coated with dust is gasified after contacting with a high temperature metal screen, so that the dust and the coal tar are separated, and the coal tar steam and the coal gas pass through the separating dust chamber to be removed from the condensation section. When the pressure drop of the first air inlet and outlet channel 1 to the second air inlet and outlet channel 1-1 of the separation device A is increased, the mixed pyrolysis gas mixed with a small amount of dust, which is separated by the primary cyclone, is subjected to dust removal through the separation device B, and a part of clean gas condensed in the condensation section is reversely introduced into the separation device A to realize the back-blowing purification of the separation device A. The pyrolysis gas mixed with trace dust after being separated by the secondary cyclone separator is mixed with the mixed gas after primary cyclone separation and then enters a separation device B for dust removal and separation;
when the pressure drop of the first air inlet and outlet channel 1 to the second air inlet and outlet channel 1-1 of the separation device B is increased, the air channel is switched, so that the separation device A is used as a separation dust removal chamber again to separate and remove dust from the mixed pyrolysis gas, and the separation device B is used as a back-blowing purification chamber again to carry out self back-blowing purification, and the purpose of continuous separation dust removal is achieved in a circulating manner.
The invention not only can effectively solve the technical problem that the solid and liquid products are difficult to separate, but also has simple operation, safety and reliability. The above embodiments are only for illustrating the technical scheme of the present invention and are not limiting. Although the invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that modifications and equivalents of the invention are intended to be encompassed within the scope of the invention without departing from the spirit and scope of the invention.
Claims (8)
1. The device for separating dust from coal tar and coal gas after pyrolysis of pulverized coal is characterized by comprising a first air inlet and outlet channel (1), a second air inlet and outlet channel (1-1) and a plurality of combined sieve plates, wherein each combined sieve plate is provided with an inlet and an outlet;
the combined screen plate comprises a metal plate frame (4), metal coil pipes (5) and metal screen meshes (6), wherein the metal plate frame (4) is of a frame structure with an inlet, an outlet and side walls, the inlets of all the metal plate frames (4) are communicated with the first air inlet and outlet channels (1), the outlets of all the metal plate frames (4) are communicated with the second air inlet and outlet channels (1-1), and the metal screen meshes (6) are arranged in a plurality of metal plate frames (4); the mesh number of the metal screen mesh (6) increases gradually along the direction from the inlet to the outlet of the metal plate frame (4); the metal coil pipe (5) is arranged on the side wall of the metal plate frame (4);
all the metal screens (6) are divided into a plurality of metal screen groups, and the mesh numbers of the metal screens (6) in each metal screen group are the same; each metal screen group comprises three single-layer metal screens (6), and the three single-layer metal screens (6) are arranged in a Z-shaped structure; the axial line of the inlet and outlet directions of each single-layer metal screen (6) and the metal plate frame (4) are included angles of non-90 degrees;
the inner cavity of the metal plate frame and the metal screen mesh can be heated by introducing a high-temperature medium into the metal coil;
and a metal screen (6) is welded with the metal plate frame (4).
2. The device for separating dust from coal tar and coal gas after pyrolysis of pulverized coal according to claim 1, wherein the mesh number of the metal screen (6) is sequentially 120 meshes, 140 meshes, 170 meshes and 200 meshes from one end to the other end of the metal plate frame (4).
3. The device for separating dust from coal tar and coal gas after pyrolysis of pulverized coal according to claim 1, wherein the metal coil (5) is spirally coiled on the side wall of the metal plate frame (4) from one end to the other end of the metal plate frame (4).
4. The device for separating dust from coal tar and coal gas after pyrolysis of pulverized coal according to claim 1, wherein when the cross section of the metal plate frame (4) is rectangular, the metal coil (5) is continuously arranged in a zigzag or zigzag shape on each side wall of the metal plate frame (4).
5. The device for separating dust from coal tar and coal gas after pyrolysis of pulverized coal according to claim 1, wherein the inlet and outlet of the metal coil (5) are respectively arranged at two ends of the metal plate frame (4).
6. The device for separating dust from coal tar and coal gas after pyrolysis of pulverized coal according to claim 1, wherein the side wall of the metal plate frame (4) is provided with a sandwich structure, and the metal coil (5) is arranged in the sandwich structure.
7. The separation method of dust, coal tar and coal gas after pulverized coal pyrolysis is characterized in that the separation device is adopted to separate the dust, the coal tar and the coal gas after pulverized coal pyrolysis, the process is as follows, a high-temperature medium is introduced into a metal coil (5), a metal screen (6) is heated to more than 300 ℃, then a mixed gas after pulverized coal pyrolysis is introduced into an inner cavity of a metal plate frame (4) from a first air inlet and outlet channel (1), the mixed gas is heated in the inner cavity of the metal plate frame (4), coal tar in the heated mixed gas is gasified, solid particles are filtered by the metal screen (6) when the mixed gas passes through the metal screen (6), and coal tar gas and coal gas generated by coal tar gasification pass through the metal screen and are discharged from an outlet of the metal plate frame (4) through a second air inlet and outlet channel (1-1);
when the pressure drop from the first air inlet and outlet channel (1) to the second air inlet and outlet channel (1-1) is increased, stopping introducing the mixed gas after pulverized coal pyrolysis; and then, introducing purified gas into the inner cavity of the metal plate frame (4) from the second air inlet and outlet channel (1-1), so that solid particles on the metal screen (6) are separated from the metal screen (6), and the separated solid particles are discharged from the inlet of the metal plate frame (4) through the first air inlet and outlet channel (1).
8. The method for separating dust from coal tar and coal gas after pulverized coal pyrolysis according to claim 7, wherein the flow direction of the mixed gas after pulverized coal pyrolysis is opposite to the flow direction of the high-temperature medium in the metal coil (5).
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