CN210176797U

CN210176797U - Tar removing device for Lurgi gasification furnace

Info

Publication number: CN210176797U
Application number: CN201920751283.1U
Authority: CN
Inventors: Changlun Li; 李昌伦; Daifu Tan; 谭代福; Jinchang Wang; 王进昌; Yibo Zhang; 张一波; Yajun Wei; 魏亚军; Chen Zhang; 张晨; Biwu Liu; 刘碧武; Shiliang Han; 韩世良; Danzhu Wang; 王丹竹
Original assignee: Shanxi Lushui River Is Pacified Coal-Based Synthetic Oil Co Ltd; Shanxi Luan Mining Group Co Ltd
Current assignee: Shanxi Lushui River Is Pacified Coal-Based Synthetic Oil Co Ltd; Shanxi Luan Mining Group Co Ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-03-24
Anticipated expiration: 2029-05-23

Abstract

The utility model relates to the technical field of coal chemical industry, and discloses a tar removing device for a Lurgi gasifier, aiming at reducing the tar content in the synthetic gas of the Lurgi gasifier and solving the relevant problems caused by large tar amount; the gasification furnace comprises a gasification furnace body, wherein an air inlet device is arranged at the bottom of the gasification furnace body, a pyrolysis disc is transversely arranged in the gasification furnace body, the bottom of the pyrolysis disc is connected with a gas pipeline, the gas pipeline is connected with a temperature adjusting device, and a plurality of air holes are formed in the pyrolysis disc; the utility model combines the catalytic structure with the lurgi gasification furnace, in the furnace, the catalyst and the coal fall into the pyrolysis disc and above area in the falling process, and fully contact with the material volatilized from the coal pyrolysis in the pyrolysis area; can effectively inhibit tar volatilized from coal; can effectively reduce the amount of tar carried in the synthetic gas at the outlet of the Lurgi pressurized gasifier, and has the advantages of simple and convenient operation, low use cost and easy popularization and use.

Description

Tar removing device for Lurgi gasification furnace

Technical Field

The utility model relates to a coal chemical industry technical field, concretely relates to tar removing device for lurgi gasifier.

Background

The lurgi gasifier has the advantages of low investment and operation cost, simple equipment, reliable operation, high content of hydrogen and methane in the synthesis gas and the like, and has the highest thermal efficiency compared with other furnaces. However, since the gasifying agent is in countercurrent contact with coal in the furnace, a pyrolysis layer is present and results in a large amount of tar being entrained in the synthesis gas, thereby generating a large amount of wastewater containing heavy tar, light tar and phenols. This not only increases the difficulty and cost of subsequent water treatment, but has become the biggest bottleneck limiting the use and development of lurgi furnaces. Reducing the tar yield is the key to overcome this problem.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes prior art's is not enough, provides a tar removing device for lurgi gasifier, and the purpose reduces the tar content in lurgi gasifier synthetic gas, solves because the tar volume is the relevant problem of bringing greatly.

The utility model provides a technical scheme that its technical problem adopted is:

the utility model provides a take off tar device for lurgi gasifier, includes the gasifier furnace body, gasifier furnace body bottom is provided with air inlet unit gasifier furnace body in horizontal have the pyrolysis dish, pyrolysis dish bottom is connected with gas pipeline, gas pipeline be connected with attemperator, the pyrolysis dish on be provided with a plurality of bleeder vents. The pyrolysis disc is provided with a catalyst with the particle size of 3-5 mm. A plurality of layers of parallel pyrolysis disks are transversely arranged in the gasification furnace body, and the bottom of each layer of pyrolysis disk is connected with a gas pipeline. The gas pipelines connected with each layer of pyrolysis disc are communicated to form a continuous gas conveying pipeline.

The structure of the device is further optimized, the pyrolysis disc comprises an upper disc and a lower disc, the upper disc and the lower disc are connected through an annular fixed surrounding edge, an interlayer is formed between the upper disc and the lower disc, a temperature adjusting device is arranged in the interlayer, and a plurality of air holes corresponding to the positions are formed in the upper disc and the lower disc.

The structure of the device is further optimized, and the pyrolysis disc is welded on the gasifier body.

The structure of the device is further optimized, and the temperature adjusting device is a temperature control heating plate.

The structure of this device further optimization, the pyrolysis dish be connected with temperature monitoring devices.

The utility model discloses produced beneficial effect does for prior art.

The utility model combines the catalytic structure with the lurgi gasification furnace, controls the catalytic structure in a reasonable particle size range by means of the characteristic of good tar decomposition of the catalytic function, controls the action temperature of the catalyst by the temperature control device, and in the furnace, the catalyst and the coal fall into a pyrolysis disc and above areas by utilizing the buoyancy of the countercurrent synthetic gas in the falling process under the action of airflow, and are fully contacted with the substances volatilized from the coal pyrolysis in the pyrolysis area; the tar formation of macromolecular fragments volatilized from coal in the synthesis gas can be effectively inhibited by virtue of the good adsorption and catalytic capabilities of the catalyst; the catalyst with smaller particle size can be taken away by the gas flow, and can also play a role in reducing tar in the gas conveying process; the coal-based catalyst has low price, does not need to be recycled, can be directly gasified or combusted along with raw coal without secondary treatment, is convenient to use, and is economic and environment-friendly; the utility model can effectively reduce the tar entrainment in the synthetic gas at the outlet of the Luqi pressure gasification furnace, and has the advantages of simple operation, low use cost and easy popularization and use.

Drawings

Fig. 1 is a schematic sectional view of a lurgi gasifier of example 1.

FIG. 2 is a schematic view of the structure of a pyrolysis tray in example 1.

Fig. 3 is a schematic sectional view of a lurgi gasifier of example 2.

FIG. 4 is a schematic view of the structure of a pyrolysis tray of example 2.

Wherein, 1 is a gasification furnace body, 2 is an air inlet, 3 is a pyrolysis disc, 4 is a gas pipeline, 5 is a circulating heating temperature controller, 6 is an air pump, 7 is an air hole, 8 is a temperature control electric heating plate, 301 is an upper disc, 302 is a lower disc, and 303 is an annular fixed surrounding edge.

Detailed Description

In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, combine embodiment and attached drawing, it is right to go on further detailed description the utility model discloses. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.

Example 1

As shown in fig. 1 and 2, the tar removing device for the lurgi gasifier comprises a gasifier body 1, wherein a gas inlet 2 is arranged at the bottom of the gasifier body 1, three layers of pyrolysis trays 3 are horizontally arranged in the gasifier body 1, the three layers of pyrolysis trays 3 are horizontally welded on the gasifier body 1, the spacing distance of the coal layer pyrolysis trays 3 is 20-40cm, the bottom of each pyrolysis tray 3 is connected with a gas pipeline 4, the gas pipelines 4 connected with each layer of pyrolysis tray 3 are communicated to form a continuous gas conveying pipeline, and one end of each gas conveying pipeline is provided with a gas pump 6; the gas pipeline 4 is connected with a circulating heating temperature controller 5 with the model of ZT-20-200-80H, and the gas pipeline 4 and the circulating heating temperature controller 5 form a temperature adjusting channel together for adjusting and controlling the temperature of the pyrolysis disc; a plurality of air holes 7 are uniformly arranged on the pyrolysis disc 3. A catalyst is placed on the pyrolysis disc 3 in advance, and the particle size of the catalyst is 3-5 mm; in the embodiment, the catalyst is prepared by loading metal calcium ions on low-ash low-sulfur lignite and pyrolyzing the low-ash low-sulfur lignite at 900 ℃ to remove volatile components. The gas pipeline 4 is externally connected with the circulating heating temperature controller 5 and used for adjusting the temperature of the catalyst in real time according to the actual production temperature so as to avoid the inactivation of the catalyst at high temperature and achieve the purposes of improving the effect of the catalyst and reducing the coal tar.

In the using process, the catalyst and the raw material coal are blown up by airflow in the gasification furnace, and most of the catalyst falls into the pyrolysis disc 3 and above by utilizing the buoyancy of the countercurrent synthetic gas in the falling process and is fully contacted with substances volatilized from the coal by the pyrolysis disc 3; the tar formation of macromolecular fragments volatilized from coal in the synthesis gas can be effectively inhibited by virtue of the good adsorption and catalytic capabilities of the catalyst; the catalyst with smaller particle size can be carried away by the gas flow, and can also play a role in reducing tar in the gas conveying process.

Example 2

As shown in fig. 3 and 4, the tar removing device for the lurgi gasifier is different from that of embodiment 1 in that the adopted pyrolysis disc 3 comprises an upper disc 301 and a lower disc 302, the upper disc 301 and the lower disc 302 are connected through an annular fixed surrounding edge 303, so that an interlayer is formed between the upper disc 301 and the lower disc 302, a temperature-controlled electric heating plate 8 is arranged in the interlayer, and a plurality of air vents 7 corresponding to the positions are arranged on the upper disc 301 and the lower disc 302.

Thus, the temperature control electric heating plate 8 is combined with the pyrolysis disc 3, gas heating relieving and matched gas pump facilities are omitted, and the device is more concise and convenient.

In the using process, a jaw crusher is used for uniformly crushing the coal-based tar-removing catalyst to below 3-5mm, and the powder is allowed to be stored without sieving. The proportion of fines (particle size less than 1 mm) in the catalyst should be less than 30%.

Uniformly mixing the catalyst with the grain diameter meeting the requirement with the gasification raw material. In order to avoid the problems of slag formation, slag melting and the like, the addition amount of the catalyst is not more than 10% in principle, namely the mass ratio of the catalyst to the gasification raw material is not more than 1: 9.

adding the catalyst and raw material coal into a gasification furnace, and making most of the catalyst fall into a pyrolysis disc 3 or above by using the buoyancy of the countercurrent synthetic gas in the falling process to fully contact with substances volatilized from coal in a pyrolysis zone; the surface temperature of the pyrolysis disc 3 is controlled through the temperature control electric heating plate 8, and the temperature of the catalyst is adjusted, so that the catalyst is prevented from being inactivated at high temperature, and the purposes of improving the effect of the catalyst and reducing the coal tar are achieved. The tar formation of macromolecular fragments volatilized from coal in the synthesis gas can be effectively inhibited by virtue of the good adsorption and catalytic capabilities of the catalyst; the catalyst with smaller particle size can be taken away by the gas flow, and can also play a role in reducing tar in the gas conveying process; can effectively reduce the amount of tar carried in the synthetic gas at the outlet of the Lurgi pressurized gasifier, and has the advantages of simple and convenient operation, low use cost and easy popularization and use.

The above description is for further details of the present invention with reference to specific preferred embodiments, and it should not be understood that the embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in a plurality of simple deductions or substitutions without departing from the scope of the present invention, and all such alterations and substitutions should be considered as belonging to the present invention, which is defined by the appended claims.

Claims

1. A tar removing device for a Lurgi gasifier comprises a gasifier body, wherein an air inlet device is arranged at the bottom of the gasifier body, and the tar removing device is characterized in that a pyrolysis disc is transversely arranged in the gasifier body, the bottom of the pyrolysis disc is connected with an air pipeline, the air pipeline is connected with a temperature adjusting device, a plurality of air holes are formed in the pyrolysis disc, and a catalyst with the particle size of 3-5mm is placed on the pyrolysis disc; a plurality of layers of parallel pyrolysis trays are transversely arranged in the gasifier body, and the bottom of each layer of pyrolysis tray is connected with a gas pipeline; the gas pipelines connected with each layer of pyrolysis disc are communicated to form a continuous gas conveying pipeline.

2. The tar removing device for the lurgi gasifier as claimed in claim 1, wherein the pyrolysis tray comprises an upper tray and a lower tray, the upper tray and the lower tray are connected through an annular fixed surrounding edge, so that an interlayer is formed between the upper tray and the lower tray, a temperature adjusting device is arranged in the interlayer, and a plurality of air holes corresponding to the positions of the upper tray and the lower tray are formed in the upper tray and the lower tray.

3. The tar removing device for the lurgi gasifier as claimed in claim 1, wherein the pyrolysis tray is welded on the gasifier body.

4. The tar removing device for the lurgi gasifier as claimed in claim 1, wherein the temperature regulating device is a temperature-controlled heating plate.

5. The tar removing device for the lurgi gasifier as claimed in claim 1, wherein the pyrolysis tray is connected with a temperature monitoring device.