CN108913222B - A pyrolysis gas treatment device and treatment method during the pyrolysis of pulverized coal to produce tar. - Google Patents

Abstract

The invention relates to a pyrolysis gas treatment device during the tar production process of pulverized coal. The treatment device includes a semi-coke filter, a cyclone separator and a spray tower module. The semi-coke filter includes a cylindrical outer shell. , an outer pipe network and an inner pipe network are arranged annularly inside the outer casing, a semi-coke distributed feeding mechanism is fixed on the top of the outer casing, and a pyrolysis gas inlet is provided at the lower part of the side wall of the outer casing; The coke distribution feeding mechanism includes a feeding dispersion cylinder, a dispersion fan and a drive motor. The top of the dispersion cylinder is fixed with a cover plate. The drive motor is fixedly located on the top of the cover plate. The dispersion fan is located in the dispersion cylinder and is driven by the drive motor. , and the blades of the dispersion fan are tilted from top to bottom, with an inclination angle of 30°-60°; the spray tower module includes a first-level spray tower, a second-level spray tower and a condenser; and use this device to heat Degassing for treatment; the present invention can not only effectively remove dust, but also achieve multi-stage separation and collection of tar.

Description

A pyrolysis gas treatment device and treatment method during the pyrolysis of pulverized coal to produce tar.

Technical field

The invention belongs to the technical field of energy and chemical engineering, and in particular relates to a pyrolysis gas treatment device and a treatment method in the process of producing tar through pyrolysis of pulverized coal.

Background technique

In my country, coal, as the main energy and chemical raw material, is also the main source of environmental pollution. Therefore, various related technologies have been developed around the multi-stage utilization of coal. At present, coal pyrolysis technology mainly includes rotary furnace pyrolysis technology, moving bed pyrolysis technology, fluidized bed pyrolysis technology and entrained bed pyrolysis technology based on pyrolyzer technology. The rotary furnace pyrolysis process and the moving bed pyrolysis process mainly use lump coal as raw material, and the tar yield is low, so they are not suitable for coal pyrolysis to produce oil. The fluidized bed pyrolysis process and the entrained bed pyrolysis process use pulverized coal. The tar output is high, but the coke content in the tar is high and difficult to separate. Existing separation technologies, such as settlers, cyclones, filters, etc., cannot effectively separate dust, which seriously restricts the use of pulverized coal. Promotion and application of pyrolysis technology.

In the Chinese invention patent, application number: 201410624018.9, it is introduced to use seed coal or seed coal semi-coke as filter media to remove waste gas dust. On the one hand, due to the large particle size of seed coal and the large gaps in the bed, the fine powder filtration effect is not ideal, especially when the amount of dust in the pulverized coal pyrolysis waste gas is larger, the dust removal effect will be unsatisfactory; on the other hand, the dust removal effect will be unsatisfactory; On the one hand, when using this filter, the linear velocity of raw gas in the filter cannot be too large. If it is too large, it will carry semi-coke into the inner tube and destroy the flow state of the filter bed. Therefore, the filter structure will be relatively large.

Therefore, based on these problems, it is of great practical significance to provide a pyrolysis gas treatment device and treatment method that can not only effectively remove dust, but also achieve multi-stage separation and collection of tar during the pyrolysis of pulverized coal to produce tar.

Contents of the invention

The object of the present invention is to overcome the shortcomings of the prior art and provide a dust removal treatment device and treatment method for waste gas, a pulverized coal pyrolysis product, which can not only effectively remove dust, but also achieve two-stage separation and utilization of tar.

The present invention solves its technical problems by adopting the following technical solutions:

A pyrolysis gas treatment device in the process of tar production from pyrolysis of pulverized coal. The treatment device includes a semi-coke filter, a cyclone separator and a spray tower module. The air outlet of the semi-coke filter is connected to the gas through a pipeline. The air inlet of the cyclone separator is connected, and the air outlet of the cyclone separator is connected to the spray tower module through a pipeline;

The semi-coke filter includes a cylindrical outer shell, an outer pipe network and an inner pipe network are arranged in an annular shape inside the outer shell, and the steel wires of the inner pipe network and the outer pipe network are all made of triangular steel wires in cross section. The distance between the pipe network and the inner wall of the outer shell is no more than 5mm. The inner pipe network is vertically located at the center of the outer shell, and the top of the inner pipe network extends out of the outer shell through a connecting pipe. The outer shell The bottom shrinks to form a semi-coke outlet, the top of the outer casing is fixed with a semi-coke distributed feeding mechanism, and the lower part of the side wall of the outer casing is provided with a pyrolysis gas inlet;

The semi-coke distributed feeding mechanism includes a feeding dispersion cylinder, a dispersion fan and a drive motor. The top of the dispersion cylinder is fixed with a cover plate. The drive motor is fixedly located on the top of the cover plate. The dispersion fan is located in the dispersion cylinder and passes through It is driven by a driving motor, and the blades of the dispersion fan are tilted from top to bottom, with an inclination angle of 30°-60°;

The spray tower module includes a first-level spray tower, a second-level spray tower and a condenser. The air outlet of the first-level spray tower is connected to the air inlet of the second-level spray tower. The first-level spray tower The spray liquid uses circulating oil, the spray liquid of the secondary spray tower uses ammonia water, the air outlet of the secondary spray tower is connected to the air inlet of the condenser, and the gas is obtained from the air outlet of the condenser; the primary spray The bottoms of the spray tower and the secondary spray tower are respectively connected to the primary liquid collecting tank and the secondary liquid collecting tank, and the bottom of the condenser is connected to the third level liquid collecting tank.

The cover plate is provided with at least two semi-coke inlets, and the semi-coke inlets are symmetrically distributed. The semi-coke is pulverized coal pyrolysis semi-coke.

The semi-coke enters the feed dispersion cylinder from the semi-coke inlet, and after being dispersed by the dispersion fan, falls between the outer pipe network and the inner pipe network.

The outer pipe network and the inner pipe network are composed of a number of stainless steel support columns and steel wires. The steel wires are circular rings of equal diameters. The steel wires are evenly sleeved and fixed on the support columns, and the distance between adjacent steel wires is is 0.1mm, and the support columns are evenly distributed in the circumferential direction, so that the support columns and steel wires form a cylindrical outer pipe network and an inner pipe network.

The spray tower can be any one of a packed tower, a float valve tower, a sieve plate tower, and a baffle tower.

The tar mixture obtained at the bottom of the first-stage spray tower is circulated as spray liquid after heat exchange.

There is a partition plate at the center of the secondary liquid collection tank, and a trumpet-shaped liquid suction nozzle is provided on the liquid surface on the side away from the tar mixture inlet. The liquid suction nozzle is connected to a bellows, and the bellows absorbs liquid through the connecting pipeline. The pump is connected to an ammonia water storage tank, and the ammonia water in the ammonia water storage tank is circulated as a spray liquid after heat exchange.

The temperature of the semi-coke filter, cyclone separator and pipeline shall not be lower than 450°C.

A method for treating pyrolysis gas during tar production from pyrolysis of pulverized coal. The method includes the following steps:

(1) The pyrolysis gas produced by pyrolysis of pulverized coal first enters the outer shell through the pyrolysis gas inlet of the semi-coke filter, and then enters between the outer pipe network and the inner pipe network through the outer pipe network. At the same time, The semi-coke falls into the space between the outer pipe network and the inner pipe network from the semi-coke distributed feeding mechanism. The pyrolysis gas and the semi-coke are in contact with each other. The temperature of the semi-coke is 450-800°C, and the dust in the pyrolysis gas is initially removed. Dust removal, the removed powder coke will be used as semi-coke product along with the semi-coke, and the pyrolysis gas after preliminary dust removal will be discharged through the top of the inner pipe network;

(2). The pyrolysis gas after preliminary dust removal in step (1) enters the cyclone separator through the top of the inner pipe network for secondary dust removal. The dust emitted by the cyclone separator is also used as a semi-coke product;

(3). The pyrolysis gas after dust removal in step (2) first enters the first-level spray tower. The first-level spray tower uses circulating oil with a temperature greater than 180° as the spray liquid, and is discharged from the first-level spray tower. The mixture of oil residue and tar is discharged from the bottom to the first-level liquid collecting tank; then the pyrolysis gas is passed into the second-level spray tower. The second-level spray tower uses ammonia water as the spray liquid, and the oil residue is discharged from the bottom of the second-level spray tower. and tar mixture to the secondary liquid collection tank; the pyrolysis gas discharged from the top of the secondary spray tower enters the condenser, where the light tar and moisture are condensed through the condenser, and the light tar and moisture are stored in the third-level liquid collection tank , and finally discharge the gas through the bottom side wall of the condenser.

The advantages and positive effects of the present invention are:

1. The semi-coke filter of the present invention realizes coarse dust removal of pyrolysis gas. Through this link, a large amount of powder coke in raw coal gas can be removed. At the same time, the powder coke will be carried out of the system along with the hot semi-coke, avoiding the dust The situation of coking when the coke is discharged outside;

2. The cyclone separator of the present invention realizes fine dust removal of raw coal gas, and the cyclone separator can further remove fine dust in the pyrolysis gas filtered by the semi-coke filter;

3. The first-level spray tower of the present invention uses circulating oil with a temperature greater than 180°C as the spray liquid, which can collect heavy tar in the pyrolysis gas. The second-level spray tower uses ammonia water as the spray liquid, which can collect heat. The light tar in the decomposition gas is collected; the pyrolysis gas discharged from the top of the secondary spray tower is condensed by the condenser to condense the remaining light tar and moisture, and the remaining light tar and moisture are condensed by the third-stage liquid collecting tank. The moisture is stored, and after three-stage treatment, the tar in the pyrolysis gas can be collected in a graded manner to the maximum extent;

4. The outer and inner pipe networks adopt steel wire and support column structures. Compared with ordinary steel wire mesh structures, the continuous gaps greatly increase the area for gas to pass through, and the steel wire wedge-shaped structure allows pyrolysis gas to enter through the steel wires. During the process of inner pipe network, the entrained semi-coke easily flows downward with the whole semi-coke, which effectively prevents the inner pipe network from being blocked and prolongs the trimming cycle.

Description of the drawings

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples. However, it should be understood that these drawings are only designed for explanation purposes and therefore do not limit the scope of the present invention. Furthermore, unless otherwise specified, the drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

Figure 1 is a schematic structural diagram of a pyrolysis gas treatment device in the tar production process of pulverized coal pyrolysis provided by an embodiment of the present invention;

Figure 2 is a top view of the semi-coke filter of the pyrolysis gas treatment device in the tar production process of pulverized coal pyrolysis provided by the embodiment of the present invention;

Figure 3 is a schematic structural diagram of the dispersion fan of the pyrolysis gas treatment device during the tar production process of pulverized coal pyrolysis provided by an embodiment of the present invention;

Figure 4 is a schematic structural diagram of the inner pipe network or the outer pipe network of the pyrolysis gas treatment device during the tar production process of pulverized coal according to the embodiment of the present invention;

Figure 5 is a schematic longitudinal section of Figure 4;

Figure 6 is a schematic structural diagram of the secondary liquid collection tank of the pyrolysis gas treatment device in the tar production process of pulverized coal pyrolysis provided by the embodiment of the present invention;

In the picture:

1. Semi-coke filter 2. Cyclone separator 3. Outer shell

4. External pipe network 5. Internal pipe network 6. Semi-coke outlet

7. Pyrolysis gas inlet 8. Feed dispersion cylinder 9. Dispersion fan

10. Drive motor 11. Cover 12. First-level spray tower

13. Secondary spray tower 14. Condenser 15. First-level liquid collection tank

16. Secondary liquid collecting tank 17. Third level liquid collecting tank 18. Semi-coke inlet

19. Support column 20. Steel wire 21. Heat exchanger

22. Partition 23. Liquid suction nozzle 24. Bellows

25. Suction pump 26. Ammonia storage tank

Detailed ways

First of all, it should be noted that the specific structure, features, advantages, etc. of the present invention will be specifically described below by way of examples. However, all descriptions are only for illustration and should not be understood as forming any limitation on the present invention. . In addition, any single technical feature described or implied in the embodiments mentioned herein can still be combined or deleted in any way between these technical features (or their equivalents), thereby obtaining the results that may not be disclosed herein. Further embodiments of the invention are directly mentioned in .

It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms, and further, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, e.g., includes A series of steps or units of a process, method, system, product, or apparatus need not be limited to those steps or units expressly listed, but may include other steps or units not expressly listed or inherent to the process, method, product, or apparatus. steps or units.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is customarily placed when used. It is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply. The devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations of the invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions and shall not be understood as indicating or implying relative importance.

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other.

The present invention will be described in detail below with reference to FIGS. 1 to 3 .

Example 1

Figure 1 is a schematic structural diagram of a pyrolysis gas treatment device in the tar production process of pulverized coal pyrolysis provided by an embodiment of the present invention; Figure 2 is a pyrolysis gas treatment device in the tar production process of pulverized coal pyrolysis provided by an embodiment of the present invention. A top view of the semi-coke filter; Figure 3 is a schematic structural diagram of the dispersion fan of the pyrolysis gas treatment device in the tar production process of pulverized coal pyrolysis provided by an embodiment of the present invention; Figure 4 is a schematic view of the pulverized coal thermal process provided by an embodiment of the present invention. A schematic structural diagram of the inner or outer pipe network of the pyrolysis gas treatment device in the process of tar production; Figure 5 is a schematic longitudinal section of Figure 4; Figure 6 is a schematic diagram of the tar production process of pulverized coal pyrolysis provided by an embodiment of the present invention. Structural diagram of the secondary liquid collection tank of the pyrolysis gas treatment device; as shown in Figures 1 to 6, this embodiment provides a pyrolysis gas treatment device in the tar production process of pulverized coal pyrolysis. The treatment device includes a semi- Coke filter 1, cyclone separator 2 and spray tower module. The air outlet of the semi-coke filter 1 is connected to the air inlet of the cyclone separator 2 through a pipeline. The air outlet of the cyclone separator 2 is connected through a pipeline. Connected to the spray tower module;

The semi-coke filter 1 includes a cylindrical outer shell 3. An outer pipe network 4 and an inner pipe network 5 are arranged annularly inside the outer shell 3. The steel wires of the inner pipe network 5 and the outer pipe network 4 are made of steel wires with a cross section of Triangular steel wire, the distance between the outer pipe network 4 and the inner wall of the outer shell 3 is no more than 5mm, the inner pipe network 5 is vertically located in the center of the outer shell 3, and the top of the inner pipe network 5 is connected by The tube extends out of the outer casing 3, and the bottom of the outer casing 3 shrinks to form a semi-coke outlet 6. A semi-coke distributed feeding mechanism is fixed on the top of the outer casing 3, and a pyrolysis device is provided on the lower side wall of the outer casing 3. air inlet 7;

The semi-coke distributed feeding mechanism includes a feeding dispersing cylinder 8, a dispersing fan 9 and a driving motor 10. The feeding dispersing cylinder 8 is fixed with a cover plate 11 on the top, and the driving motor 10 is fixed on the top of the cover plate 11. , the dispersing fan 9 is located in the feed dispersing cylinder 8 and is driven by the driving motor 10, and the blades of the dispersing fan 9 are inclined from top to bottom, with an inclination angle of 30°-60°, and the cover plate 11 is provided with at least two There are three semi-coke inlets 18, and the semi-coke inlets 18 are symmetrically distributed. The semi-coke is pulverized coal pyrolysis semi-coke. The semi-coke enters the feed dispersion tube 8 from the semi-coke inlet 18, and is dispersed by the dispersion fan 9. Falling between the outer pipe network 4 and the inner pipe network 5, since the blades of the dispersing fan 9 have an inclined structure, when the dispersing fan rotates, it can drive the semi-coke to rotate and make the semi-coke fall, making the semi-coke more uniform. are scattered between the outer pipe network 4 and the inner pipe network 5, so as to better contact with the pyrolysis gas for dust removal;

The spray tower module includes a first-level spray tower 12, a second-level spray tower 13 and a condenser 14. The air outlet of the first-level spray tower 12 is connected to the air inlet of the second-level spray tower 13. The spray liquid of the first-level spray tower 12 uses circulating oil, and the spray liquid of the second-level spray tower 13 uses ammonia water. The air outlet of the second-level spray tower 13 is connected to the air inlet of the condenser 14. The condenser 14 Gas is obtained from the gas outlet; the bottoms of the first-level spray tower 12 and the second-level spray tower 13 are respectively connected to the first-level liquid collection tank 15 and the second-level liquid collection tank 16, and the bottom of the condenser 14 is connected to the third-level liquid collection tank. Can 17.

The outer pipe network 4 and the inner pipe network 5 are composed of a number of stainless steel support columns 19 and steel wires 20. The steel wires 20 are circular rings of equal diameters, and the steel wires 20 are evenly sleeved and fixed on the support columns 19. And the distance between adjacent steel wires 20 is 0.1mm, and the support columns 19 are evenly distributed in the circumferential direction, so that the support columns 19 and the steel wires 20 form a cylindrical outer pipe network 4 and an inner pipe network 5. It should be noted that, When the steel wire 20 with a triangular cross-section forms a tubular structure with the support column 19, the outer surface of the tubular structure is a smooth structure, as shown in Figures 4 and 5. Compared with the ordinary steel wire mesh structure, this structure has greatly increased continuous gaps. The area of waste gas is reduced, and the steel wire wedge structure allows the pyrolysis gas to enter the inner pipe network through the steel wire, and the entrained semi-coke easily flows downward with the entire semi-coke, effectively preventing the inner pipe network from being blocked and prolonging the trimming cycle. .

The spray tower can be any one of a packed tower, a float valve tower, a sieve plate tower, and a baffle tower.

The tar mixture obtained at the bottom of the first-stage spray tower 12 is circulated as spray liquid after passing through the heat exchanger 21 .

The secondary liquid collection tank 16 is provided with a partition 22 at the center, and a trumpet-shaped liquid suction nozzle 23 is provided on the liquid surface on one side away from the tar mixture inlet. The liquid suction nozzle 23 is connected to a bellows 24, and the bellows 24 passes through The connecting pipeline is connected to the ammonia water storage tank 26 through the liquid suction pump 25. The ammonia water in the ammonia water storage tank 26 is circulated as a spray liquid after being heat exchanged by the heat exchanger 21.

After the tar and ammonia water are stratified, the partition structure makes the side away from the entrance of the tar mixture more stable, making it easier for the suction nozzle to absorb ammonia water. By controlling the density of the bellows and suction nozzle to be smaller than the density of ammonia water, the suction nozzle floats on the surface of ammonia water. , thus simply realizing the function of ammonia water as circulating spray liquid.

The temperature of the semi-coke filter 1, cyclone separator 2 and pipeline shall not be lower than 450°C.

It should be noted that the fixed connection method in the present invention adopts conventional means such as bolts, rivets, and welding that are mature in the prior art, and will not be described in detail here. However, due to the above reasons, it will not affect the repeated reproduction by those skilled in the art.

In order to facilitate the installation of various components and other structures of the pyrolysis gas treatment device, some bracket structures can be equipped according to the landform structure, and the specific shape is designed according to the installation space.

Example 2

For pyrolysis of pulverized coal with a particle size of 0-7mm at 600°C, the pyrolysis gas treatment method during the pyrolysis process includes the following steps:

(1) The pyrolysis gas produced by pyrolysis of pulverized coal first enters the outer shell through the pyrolysis gas inlet of the semi-coke filter, and then enters between the outer pipe network and the inner pipe network through the outer pipe network. At the same time, The semi-coke falls into the space between the outer pipe network and the inner pipe network from the semi-coke distributed feeding mechanism. The pyrolysis gas and the semi-coke are in contact with each other. The temperature of the semi-coke is 450-800°C, and the temperature of the semi-coke filter is 500°C. Left and right, the dust in the pyrolysis gas is preliminarily removed, and the removed powder coke is used as a semi-coke product along with the semi-coke. The pyrolysis gas after preliminary dust removal is discharged through the top of the inner pipe network;

(2). The pyrolysis gas after preliminary dust removal in step (1) enters the cyclone separator through the top of the inner pipe network. The temperature is maintained at about 500°C for secondary dust removal. The dust emitted by the cyclone separator is also used as a semi-coke product;

(3). The pyrolysis gas after dust removal in step (2) first enters the first-level spray tower. The first-level spray tower uses circulating oil with a temperature greater than 180°C as the spray liquid, and is discharged from the first-level spray tower. The mixture of oil residue and tar is discharged from the bottom to the first-level liquid collecting tank; then the pyrolysis gas is passed into the second-level spray tower. The second-level spray tower uses ammonia water as the spray liquid, and the oil residue is discharged from the bottom of the second-level spray tower. and tar mixture to the secondary liquid collection tank; the pyrolysis gas discharged from the top of the secondary spray tower enters the condenser, where the light tar and moisture are condensed through the condenser, and the light tar and moisture are stored in the third-level liquid collection tank , and finally discharge the gas through the bottom side wall of the condenser.

After calculation, the amount of pulverized coal with a particle size of 0-7mm is 10kg/h, and the amount of dust produced by pyrolysis is about 10% of the total amount of coal. After dust removal, the dust content in the tar is less than 0.5%.

Example 3

For pyrolysis of pulverized coal with a particle size of 0.3-3mm at 600°C, the pyrolysis gas treatment method during the pyrolysis process includes the following steps:

(1) The pyrolysis gas produced by pyrolysis of pulverized coal first enters the outer shell through the pyrolysis gas inlet of the semi-coke filter, and then enters between the outer pipe network and the inner pipe network through the outer pipe network. At the same time, The semi-coke falls into the space between the outer pipe network and the inner pipe network from the semi-coke distributed feeding mechanism. The pyrolysis gas and the semi-coke are in contact with each other. The temperature of the semi-coke is 450-800°C, and the temperature of the semi-coke filter is 500°C. Left and right, the dust in the pyrolysis gas is preliminarily removed, and the removed powder coke is used as a semi-coke product along with the semi-coke. The pyrolysis gas after preliminary dust removal is discharged through the top of the inner pipe network;

(2). The pyrolysis gas after preliminary dust removal in step (1) enters the cyclone separator through the top of the inner pipe network. The temperature is maintained at about 500°C for secondary dust removal. The dust emitted by the cyclone separator is also used as a semi-coke product;

(3). The pyrolysis gas after dust removal in step (2) first enters the first-level spray tower. The first-level spray tower uses circulating oil with a temperature greater than 180° as the spray liquid, and is discharged from the first-level spray tower. The mixture of oil residue and tar is discharged from the bottom to the first-level liquid collecting tank; then the pyrolysis gas is passed into the second-level spray tower. The second-level spray tower uses ammonia water as the spray liquid, and the oil residue is discharged from the bottom of the second-level spray tower. and tar mixture to the secondary liquid collection tank; the pyrolysis gas discharged from the top of the secondary spray tower enters the condenser, where the light tar and moisture are condensed through the condenser, and the light tar and moisture are stored in the third-level liquid collection tank , and finally discharge the gas through the bottom side wall of the condenser.

After calculation, the amount of pulverized coal with a particle size of 0.3-3mm is 10kg/h, and the amount of dust produced by pyrolysis is about 10% of the total amount of coal. After dust removal, the dust content in the tar is less than 0.5%.

Example 4

For pyrolysis of pulverized coal with a particle size of 1-2 mm at 600°C, the pyrolysis gas treatment method during the pyrolysis process includes the following steps:

(1) The pyrolysis gas produced by pyrolysis of pulverized coal first enters the outer shell through the pyrolysis gas inlet of the semi-coke filter, and then enters between the outer pipe network and the inner pipe network through the outer pipe network. At the same time, The semi-coke falls into the space between the outer pipe network and the inner pipe network from the semi-coke distributed feeding mechanism. The pyrolysis gas and the semi-coke are in contact with each other. The temperature of the semi-coke is 450-800°C, and the temperature of the semi-coke filter is 500°C. Left and right, the dust in the pyrolysis gas is preliminarily removed, and the removed powder coke is used as a semi-coke product along with the semi-coke. The pyrolysis gas after preliminary dust removal is discharged through the top of the inner pipe network;

(2). The pyrolysis gas after preliminary dust removal in step (1) enters the cyclone separator through the top of the inner pipe network. The temperature is maintained at about 500°C for secondary dust removal. The dust emitted by the cyclone separator is also used as a semi-coke product;

(3). The pyrolysis gas after dust removal in step (2) first enters the first-level spray tower. The first-level spray tower uses circulating oil with a temperature greater than 180°C as the spray liquid, and is discharged from the first-level spray tower. The mixture of oil residue and tar is discharged from the bottom to the first-level liquid collecting tank; then the pyrolysis gas is passed into the second-level spray tower. The second-level spray tower uses ammonia water as the spray liquid, and the oil residue is discharged from the bottom of the second-level spray tower. and tar mixture to the secondary liquid collection tank; the pyrolysis gas discharged from the top of the secondary spray tower enters the condenser, where the light tar and moisture are condensed through the condenser, and the light tar and moisture are stored in the third-level liquid collection tank , and finally discharge the gas through the bottom side wall of the condenser.

After calculation, the amount of pulverized coal with a particle size of 1-2mm is 10kg/h, and the amount of dust produced by pyrolysis is about 13% of the total coal amount. After dust removal, the dust content in the tar is less than 0.5%.

The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the implementation scope of the present invention. All equivalent changes and improvements made within the scope of the present invention shall still fall within the scope of the patent of the present invention.

Claims (6)

1. Pyrolysis gas processing apparatus in tar production process is pyrolyzed to fine coal, its characterized in that: the treatment device comprises a semicoke filter, a cyclone separator and a spray tower module, wherein an air outlet of the semicoke filter is connected with an air inlet of the cyclone separator through a pipeline, and an air outlet of the cyclone separator is connected with the spray tower module through a pipeline;

the semicoke filter comprises a cylindrical outer shell, an outer pipe network and an inner pipe network are annularly arranged in the outer shell, steel wires of the inner pipe network and the outer pipe network are steel wires with triangular cross sections, the distance between the outer pipe network and the inner wall of the outer shell is not more than 5mm, the inner pipe network is vertically arranged at the central position of the outer shell, the top of the inner pipe network extends out of the outer shell through a connecting pipe, the bottom of the outer shell is contracted to form a semicoke outlet, a semicoke distribution feeding mechanism is fixedly arranged at the top of the outer shell, and a pyrolysis gas inlet is arranged at the lower part of the side wall of the outer shell;

the semicoke distribution feeding mechanism comprises a feeding dispersing cylinder, a dispersing fan and a driving motor, wherein a cover plate is fixedly arranged at the top of the dispersing cylinder, the driving motor is fixedly arranged at the top of the cover plate, the dispersing fan is positioned in the dispersing cylinder and driven by the driving motor, and the fan blades of the dispersing fan incline downwards from top to bottom, and the inclination angle is 30-60 degrees;

the spray tower module comprises a first-stage spray tower, a second-stage spray tower and a condenser, wherein an air outlet of the first-stage spray tower is connected with an air inlet of the second-stage spray tower, circulating oil is adopted as spray liquid of the first-stage spray tower, ammonia water is adopted as spray liquid of the second-stage spray tower, an air outlet of the second-stage spray tower is connected with an air inlet of the condenser, and gas is obtained from an air outlet of the condenser; the bottoms of the first-stage spray tower and the second-stage spray tower are respectively connected with a first-stage liquid collecting tank and a second-stage liquid collecting tank, and the bottom of the condenser is connected with a third-stage liquid collecting tank;

the outer pipe network and the inner pipe network are composed of a plurality of stainless steel support columns and steel wires, the steel wires are in an equal-diameter annular shape, the steel wires are uniformly sleeved and fixed on the support columns, the distance between the adjacent steel wires is 0.1mm, and the support columns are uniformly distributed in the circumferential direction, so that the support columns and the steel wires form a cylindrical outer pipe network and an inner pipe network;

the tar mixture obtained at the bottom of the primary spray tower is partially subjected to heat exchange and then circulated to be used as spray liquid;

the middle position inside the secondary liquid collecting tank is provided with a baffle, a horn-shaped liquid suction nozzle is arranged on the liquid level on one side far away from the tar mixture inlet, the liquid suction nozzle is connected with a corrugated pipe, the corrugated pipe is connected to an ammonia water storage box through a liquid suction pump through a connecting pipeline, and ammonia water in the ammonia water storage box is circulated as spray liquid after heat exchange.

2. The pyrolysis gas treatment device in the process of producing tar by pyrolysis of pulverized coal according to claim 1, wherein: and at least two semicoke inlets are arranged on the cover plate and symmetrically distributed, and the semicoke is pulverized coal pyrolysis semicoke.

3. The pyrolysis gas treatment device in the process of producing tar by pyrolysis of pulverized coal according to claim 2, wherein: semicoke enters the feeding dispersion cylinder from the semicoke inlet, and falls between the outer pipe network and the inner pipe network after being dispersed by the dispersion fan.

4. The pyrolysis gas treatment device in the process of producing tar by pyrolysis of pulverized coal according to claim 1, wherein: the spray tower can be any one of a packed tower, a floating valve tower, a sieve plate tower and a baffle plate.

5. The pyrolysis gas treatment device in the process of producing tar by pyrolysis of pulverized coal according to claim 1, wherein: the temperature of the semicoke filter, the cyclone separator and the pipeline is not lower than 450 ℃.

6. A pyrolysis gas treatment method in the process of producing tar by pyrolyzing pulverized coal by using the device as claimed in claim 1, which is characterized in that: the method comprises the following steps:

(1) Pyrolysis gas generated by pyrolysis of pulverized coal firstly enters the shell through a pyrolysis gas inlet of a semicoke filter, then enters a space between an outer pipe network and an inner pipe network through an outer pipe network, and meanwhile semicoke falls into the space between the outer pipe network and the inner pipe network through a semicoke distribution feeding mechanism, wherein the pyrolysis gas and semicoke are in contact with each other, the semicoke temperature is 450-800 ℃, dust in the pyrolysis gas is primarily removed, the removed semicoke is taken as a semicoke product along with semicoke, and the pyrolysis gas after primary dust removal is discharged from the space above the inner pipe network;

(2) The pyrolysis gas after preliminary dust removal in the step (1) enters a cyclone separator from the upper part of the inner pipe net to carry out secondary dust removal, and dust discharged by the cyclone separator is also used as a semicoke product;

(3) Firstly, the pyrolysis gas subjected to dedusting in the step (2) enters a first-stage spray tower, the first-stage spray tower adopts circulating oil with the temperature of more than 180 degrees as spray liquid, and oil residue and tar mixture is discharged from the bottom of the first-stage spray tower to a first-stage liquid collecting tank; then the pyrolysis gas is introduced into a secondary spray tower, the secondary spray tower adopts ammonia water as spray liquid, and the mixture of oil residue and tar is discharged from the bottom of the secondary spray tower to a secondary liquid collecting tank; the pyrolysis gas discharged from the top of the secondary spray tower enters a condenser, light tar and water are condensed by the condenser, the light tar and the water are stored by a tertiary liquid collecting tank, and finally coal gas is discharged from the side wall of the bottom of the condenser.