CN108913222B - Pyrolysis gas treatment device and treatment method in pulverized coal pyrolysis tar production process - Google Patents

Abstract

The application relates to a pyrolysis gas treatment device in the process of producing tar by pyrolyzing pulverized coal, which comprises a semicoke filter, a cyclone separator and a spray tower module, wherein the semicoke filter comprises a cylindrical outer shell, an outer pipe network and an inner pipe network are annularly arranged in the outer shell, 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 primary spray tower, a secondary spray tower and a condenser; and using the device to treat pyrolysis gas; the application not only can effectively remove dust, but also can realize multistage separation and collection of tar.

Description

Pyrolysis gas treatment device and treatment method in pulverized coal pyrolysis tar production process

Technical Field

The application belongs to the technical field of energy and chemical industry, and particularly relates to a pyrolysis gas treatment device and a treatment method in the process of producing tar by pyrolyzing pulverized coal.

Background

In China, coal is used as a main energy source and a chemical raw material, and is also a main pollution source of the environment. Accordingly, various related technologies have been developed around the multi-stage utilization of coal. At present, the coal pyrolysis technology mainly comprises a rotary furnace pyrolysis process, a moving bed pyrolysis process, a fluidized bed pyrolysis process, an entrained flow pyrolysis process and the like according to a pyrolyzer process. The rotary furnace pyrolysis process and the moving bed pyrolysis process mainly use lump coal as raw materials, have low tar yield, and are not suitable for the coal pyrolysis oil production technology; the fluidized bed pyrolysis process and the entrained flow pyrolysis process utilize pulverized coal feed, the tar yield is high, but the content of pulverized coke in the tar is high, and the pulverized coke is not easy to separate, and the existing separation technology such as a settler, a cyclone separator, a filter and the like can not effectively separate dust, so that the popularization and the application of the pulverized coal pyrolysis technology are severely restricted.

In Chinese application patent, application number: 201410624018.9 uses seed coal or semicoke as filter medium to remove dust from raw gas. On one hand, as the grain size of the seed coal is larger, the gap of the bed layer is larger, so that the fine powder filtering effect is not ideal, and especially the dust removing effect is not ideal when the seed coal is used for pyrolyzing the pulverized coal to obtain the crude gas with more dust; on the other hand, the raw gas cannot be too high in the linear speed of the filter, semicoke is carried into the inner tube slightly too much, and the flowing state of the filter bed layer is damaged, so that the filter structure is huge.

Therefore, based on the problems, the pyrolysis gas treatment device and the pyrolysis gas treatment method in the process of producing the tar by the pulverized coal pyrolysis, which can not only effectively remove dust, but also realize multistage separation and collection of the tar, are provided, and have important practical significance.

Disclosure of Invention

The application aims to overcome the defects of the prior art and provide a dust removal treatment device and a dust removal treatment method for raw coal gas, which can not only effectively remove dust, but also realize two-stage separation and utilization of tar.

The application solves the technical problems by adopting the following technical scheme:

the pyrolysis gas treatment device comprises a semicoke filter, a cyclone separator and a spray tower module, wherein a gas outlet of the semicoke filter is connected with a gas inlet of the cyclone separator through a pipeline, and a gas 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.

And at least two semicoke inlets are arranged on the cover plate and symmetrically distributed, and the semicoke is pulverized coal pyrolysis semicoke.

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.

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 of an equal-diameter annular shape, the steel wires are uniformly sleeved and fixed on the support columns, the distance between 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 spray tower can be any one of a packed tower, a floating valve tower, a sieve plate tower and a baffle plate.

And a part of tar mixture obtained at the bottom of the primary spray tower is recycled to be used as spray liquid after heat exchange.

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.

The temperature of the semicoke filter, the cyclone separator and the pipeline is not lower than 450 ℃.

A pyrolysis gas treatment method in a pulverized coal pyrolysis tar production process, the method comprising 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.

The application has the advantages and positive effects that:

1. the semicoke filter provided by the application realizes coarse dust removal of pyrolysis gas, and can remove a large amount of coke breeze in raw coke oven gas through the link, and meanwhile, the coke breeze can be carried out of the system along with hot semicoke, so that the condition of coking during the outward discharge of the coke breeze is avoided;

2. the cyclone separator provided by the application realizes fine dust removal of raw gas, and can further remove fine dust in pyrolysis gas filtered by the semicoke filter;

3. the primary spray tower adopts the circulating oil with the temperature of more than 180 ℃ as the spray liquid, so that heavy tar in pyrolysis gas can be collected, and the secondary spray tower adopts ammonia water as the spray liquid, so that light tar in pyrolysis gas can be collected; the pyrolysis gas discharged from the top of the secondary spray tower is condensed by a condenser to condense the rest light tar and moisture, the rest light tar and moisture are stored by a tertiary liquid collecting tank, and the tar in the pyrolysis gas can be collected in a grading way to the maximum extent after tertiary treatment;

4. the outer pipe network and the inner pipe network adopt steel wires and support column structures, compared with the common steel wire network structure, the continuous gaps greatly increase the area of the raw coke oven gas, and the steel wires are of a wedge type structure, so that pyrolysis gas enters the inner pipe network through the steel wires, entrained semicoke is easy to flow downwards along with the semicoke, the inner pipe network is effectively prevented from being blocked, and the trimming period is prolonged.

Drawings

The technical solution of the present application will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present application. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

FIG. 1 is a schematic diagram of a pyrolysis gas treatment device in a pulverized coal pyrolysis tar production process according to an embodiment of the present application;

FIG. 2 is a top view of a semicoke filter of a pyrolysis gas treatment device in a pulverized coal pyrolysis tar production process, provided by an embodiment of the application;

FIG. 3 is a schematic view of a dispersion fan of a pyrolysis gas treatment device in the process of producing tar by pyrolysis of pulverized coal according to the embodiment of the application;

FIG. 4 is a schematic structural diagram of an inner pipe network or an outer pipe network of a pyrolysis gas treatment device in a pulverized coal pyrolysis tar production process according to an embodiment of the present application;

FIG. 5 is a schematic longitudinal section of FIG. 4;

FIG. 6 is a schematic structural view of a secondary liquid collecting tank of a pyrolysis gas treatment device in the process of producing tar by pyrolysis of pulverized coal, which is provided by the embodiment of the application;

in the figure:

1. semicoke filter 2, cyclone separator 3 and outer shell

4. Outer pipe network 5, inner pipe network 6 and semicoke outlet

7. Pyrolysis gas inlet 8, feed dispersion cylinder 9, dispersion fan

10. Driving motor 11, cover plate 12, primary spray tower

13. Second-stage spray tower 14, condenser 15 and first-stage liquid collecting tank

16. Secondary liquid collecting tank 17, tertiary liquid collecting tank 18 and semicoke inlet

19. Support column 20, steel wire 21 and heat exchanger

22. Baffle 23, pipette 24, bellows

25. Liquid suction pump 26 and ammonia water storage box

Detailed Description

First, it should be noted that the following detailed description of the specific structure, characteristics, advantages, and the like of the present application will be given by way of example, however, all descriptions are merely illustrative, and should not be construed as limiting the present application in any way. Furthermore, any single feature described or implicit in the embodiments referred to herein may still be combined or truncated in any way between such features (or equivalents thereof) to obtain still further embodiments of the application that may not be directly referred to herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and the terms "comprising" and "having" and any variation thereof are intended to cover a non-exclusive inclusion, e.g., a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The present application will be described in detail with reference to fig. 1 to 3.

Example 1

FIG. 1 is a schematic diagram of a pyrolysis gas treatment device in a pulverized coal pyrolysis tar production process according to an embodiment of the present application; FIG. 2 is a top view of a semicoke filter of a pyrolysis gas treatment device in a pulverized coal pyrolysis tar production process, provided by an embodiment of the application; FIG. 3 is a schematic view of a dispersion fan of a pyrolysis gas treatment device in the process of producing tar by pyrolysis of pulverized coal according to the embodiment of the application; FIG. 4 is a schematic structural diagram of an inner pipe network or an outer pipe network of a pyrolysis gas treatment device in a pulverized coal pyrolysis tar production process according to an embodiment of the present application; FIG. 5 is a schematic longitudinal section of FIG. 4; FIG. 6 is a schematic structural view of a secondary liquid collecting tank of a pyrolysis gas treatment device in the process of producing tar by pyrolysis of pulverized coal, which is provided by the embodiment of the application; as shown in fig. 1 to 6, the pyrolysis gas treatment device in the pulverized coal pyrolysis tar production process provided by the embodiment comprises a semicoke filter 1, a cyclone separator 2 and a spray tower module, wherein a gas outlet of the semicoke filter 1 is connected with a gas inlet of the cyclone separator 2 through a pipeline, and a gas outlet of the cyclone separator 2 is connected with the spray tower module through a pipeline;

the semicoke filter 1 comprises a cylindrical outer shell 3, an outer pipe network 4 and an inner pipe network 5 are annularly arranged in the outer shell 3, steel wires of the inner pipe network 5 and the outer pipe network 4 are steel wires with triangular cross sections, the distance between the outer pipe network 4 and the inner wall of the outer shell 3 is not more than 5mm, the inner pipe network 5 is vertically arranged at the central position of the outer shell 3, the top of the inner pipe network 5 extends out of the outer shell 3 through a connecting pipe, the bottom of the outer shell 3 is contracted to form a semicoke outlet 6, a semicoke distribution feeding mechanism is fixedly arranged at the top of the outer shell 3, and a pyrolysis gas inlet 7 is arranged at the lower part of the side wall of the outer shell 3;

the semicoke distribution feeding mechanism comprises a feeding dispersion cylinder 8, a dispersion fan 9 and a driving motor 10, wherein a cover plate 11 is fixedly arranged at the top of the feeding dispersion cylinder 8, the driving motor 10 is fixedly arranged at the top of the cover plate 11, the dispersion fan 9 is positioned in the feeding dispersion cylinder 8 and is driven by the driving motor 10, the blades of the dispersion fan 9 incline downwards from top to bottom, the inclination angle is 30-60 DEG, at least two semicoke inlets 18 are arranged on the cover plate 11, the semicoke inlets 18 are symmetrically distributed, semicoke is pulverized coal pyrolysis semicoke, the semicoke enters the feeding dispersion cylinder 8 from the semicoke inlets 18, and after being dispersed by the dispersion fan 9, the semicoke falls between the outer pipe network 4 and the inner pipe network 5, and as the blades of the dispersion fan 9 are of an inclined structure, the dispersion fan can drive the semicoke to rotate and enable the semicoke to fall down when rotating, so that the semicoke is more uniformly scattered between the outer pipe network 4 and the inner pipe network 5, and is better contacted with pyrolysis gas to remove dust;

the spray tower module comprises a first-stage spray tower 12, a second-stage spray tower 13 and a condenser 14, wherein an air outlet of the first-stage spray tower 12 is connected with an air inlet of the second-stage spray tower 13, circulating oil is adopted as spray liquid of the first-stage spray tower 12, ammonia water is adopted as spray liquid of the second-stage spray tower 13, an air outlet of the second-stage spray tower 13 is connected with an air inlet of the condenser 14, and an air outlet of the condenser 14 is used for obtaining coal gas; the bottoms of the first-stage spray tower 12 and the second-stage spray tower 13 are respectively connected with a first-stage liquid collecting tank 15 and a second-stage liquid collecting tank 16, and the bottom of the condenser 14 is connected with a third-stage liquid collecting tank 17.

The outer pipe net 4 and the inner pipe net 5 are composed of a plurality of stainless steel support columns 19 and steel wires 20, the steel wires 20 are in an equal-diameter circular ring shape, the steel wires 20 are uniformly sleeved and fixed on the support columns 19, the distance between the adjacent steel wires 20 is 0.1mm, the support columns 19 are uniformly distributed in the circumferential direction, the support columns 19 and the steel wires 20 form a cylindrical outer pipe net 4 and an inner pipe net 5, and when the steel wires 20 with triangular sections and the support columns 19 form a tubular structure, the outer surface of the tubular structure is of a smooth structure, as shown in fig. 4 and 5, compared with a common steel wire net structure, the continuous gap greatly increases the area of raw gas, and the steel wire wedge structure enables pyrolysis gas to flow downwards along with semicoke in the whole process of entering the inner pipe net through the steel wires, so that the inner pipe net is effectively prevented from being blocked, and the trimming period is prolonged.

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

The tar mixture obtained at the bottom of the primary spray tower 12 is partially circulated through a heat exchanger 21 and then used as spray liquid.

The middle position inside the secondary liquid collection tank 16 is provided with a baffle 22, the liquid level on one side far away from the tar mixture inlet is provided with a horn-shaped liquid suction nozzle 23, the liquid suction nozzle 23 is connected with a corrugated pipe 24, the corrugated pipe 24 is connected to an ammonia water storage tank 26 through a liquid suction pump 25 by a connecting pipeline, and ammonia water in the ammonia water storage tank 26 is circulated to be used as spray liquid after heat exchange of the heat exchanger 21.

After tar and aqueous ammonia layering, the baffle structure makes one side of keeping away from tar mixture entry more stable, and the imbibition mouth of being convenient for absorbs aqueous ammonia, is less than aqueous ammonia density through the density of control bellows and imbibition mouth for imbibition mouth floats on aqueous ammonia surface, thereby simple realization aqueous ammonia is as the function of circulating spray liquid.

The temperature of the semicoke filter 1, the cyclone separator 2 and the pipeline is not lower than 450 ℃.

It should be noted that, the fixing connection manner in the present application adopts conventional means such as mature bolts, rivets, welding in the prior art, which are not described herein, but for the above reasons, repeated reproduction by those skilled in the art is not affected.

In order to facilitate the installation of structures such as all parts of the pyrolysis gas treatment device, a plurality of support structures can be arranged according to the landform structure, and the specific shape is designed according to the installation space.

Example 2

The pyrolysis gas treatment method for the pulverized coal with the particle size of 0-7mm in the pyrolysis process 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, semicoke falls into the space between the outer pipe network and the inner pipe network through a semicoke distribution feeding mechanism, the pyrolysis gas and semicoke are contacted with each other, the semicoke temperature is 450-800 ℃, the semicoke filter temperature is about 500 ℃, dust in the pyrolysis gas is primarily removed, the removed pulverized coal 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, the temperature is maintained at about 500 ℃, secondary dust removal is carried out, 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 ℃ as spray liquid, and the mixture of oil residue and tar 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.

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

Example 3

The pyrolysis gas treatment method for the pulverized coal with the particle size of 0.3-3mm in the pyrolysis process 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, semicoke falls into the space between the outer pipe network and the inner pipe network through a semicoke distribution feeding mechanism, the pyrolysis gas and semicoke are contacted with each other, the semicoke temperature is 450-800 ℃, the semicoke filter temperature is about 500 ℃, dust in the pyrolysis gas is primarily removed, the removed pulverized coal 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, the temperature is maintained at about 500 ℃, secondary dust removal is carried out, 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.

Calculated, the coal feeding amount of the pulverized coal with the grain diameter of 0.3-3mm is 10kg/h, the dust amount generated by pyrolysis is about 10% of the total coal feeding amount, and the dust content in the tar is less than 0.5% after dust removal.

Example 4

The pyrolysis gas treatment method for the pulverized coal with the particle size of 1-2mm in the pyrolysis process 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, semicoke falls into the space between the outer pipe network and the inner pipe network through a semicoke distribution feeding mechanism, the pyrolysis gas and semicoke are contacted with each other, the semicoke temperature is 450-800 ℃, the semicoke filter temperature is about 500 ℃, dust in the pyrolysis gas is primarily removed, the removed pulverized coal 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, the temperature is maintained at about 500 ℃, secondary dust removal is carried out, 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 ℃ as spray liquid, and the mixture of oil residue and tar 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.

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

The foregoing examples illustrate the application in detail, but are merely preferred embodiments of the application and are not to be construed as limiting the scope of the application. All equivalent changes and modifications within the scope of the present application are intended to be covered by the present application.

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.