Recovery processing device for disordered emission of coal gasification device

Abstract

The utility model discloses a disordered emission recovery treatment device for a coal gasification device, which is characterized by comprising a group of collectors arranged at an emission point, any collector is connected with a pretreatment tower, a gas phase outlet at the top of the pretreatment tower is connected with an air suction fan, and the air suction fan is connected with an air outlet of the coal gasification device. An outlet of the air suction fan is sequentially connected with an incinerator and a waste heat boiler, and an outlet of the waste heat boiler is connected with a chimney through an exhaust fan. The disordered emission recovery treatment device of the coal gasification device can solve the pollution caused by disordered emission on site of the device and eliminate peculiar smell on site.

Description

Technical Field

[0001] This utility model belongs to the field of coal gasification technology, specifically relating to a disordered emission recovery and treatment device for coal gasification equipment. Background Technology

[0002] Pressurized coal-water slurry gasification is the mainstream gasification technology in the current large-scale coal chemical industry. It uses coal-water slurry as raw material, pressurizing it before feeding it into a gasifier to react with oxygen. It features high carbon conversion rate, low pollutant emissions, and long operating time. The coal-water slurry is produced by grinding coal in a coal mill. The gasification reaction takes place in the gasifier. During this process, unreacted coal and syngas enter the quench chamber together. After quenching, coarse slag is collected at the bottom of the gasifier, and the syngas is sent to a scrubbing tower to remove fine slag, producing crude coal gas. In addition to the gasifier and scrubbing tower, coal gasification plants contain numerous other equipment such as coal mills, slag removers, pressure relief buffer tanks, and blowdown expansion tanks. Numerous unregulated emission points exist at the coal gasification plant site. During production, these include heat emissions from the mill outlet, the slag-water deaerator, and high-temperature gases escaping during periodic slag discharge from the lock hopper. In normal production, the lack of sealing equipment or inadequate sealing systems leads to significant emissions. Disorderly emissions are characterized by dispersed emission points, irregular emission times, wide emission range, and a diffuse, ground-level appearance that is difficult to quantify and treat. This makes them difficult to manage, resulting in unpleasant odors on-site and causing resource waste and environmental pollution. Summary of the Invention

[0003] The purpose of this utility model is to provide a device for the recovery and treatment of disordered emissions from a coal gasification unit, which solves the pollution caused by disordered emissions at the unit site, eliminates on-site odors, recovers useful substances contained in the emissions, and comprehensively utilizes the waste gas.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0005] A device for recovering and treating disordered emissions from a coal gasification unit, characterized in that the device includes a set of collectors installed at the emission point, any one of the collectors being connected to a pretreatment tower, the gas phase outlet at the top of the pretreatment tower being connected to an intake fan, the outlet of the intake fan being sequentially connected to an incinerator and a waste heat boiler, and the outlet of the waste heat boiler being connected to a chimney via an exhaust fan.

[0006] Furthermore, the collectors include blow-suction type, external type, and closed type collectors. The collectors can be rationally selected and installed according to the actual conditions of the site, and based on different production operation processes and equipment characteristics.

[0007] Furthermore, the pretreatment tower includes internal components and packing material, with a spray water device installed at the top and a spray water circulation pump at the bottom. The gas collected by the collector enters from the middle of the pretreatment tower packing and exits from the top. Preferably, the pretreatment tower is also equipped with a chemical dosing device to ensure the stability of the water quality within the tower and maintain the pH at approximately 7-9.

[0008] Furthermore, the incinerator includes a perpetual flame.

[0009] Beneficial effects: The uncontrolled emission recovery and treatment device for coal gasification plants can solve the pollution caused by uncontrolled emissions on-site, effectively eliminate on-site odors, and recover useful substances contained in the emissions, enabling comprehensive utilization of waste gas. It also increases the recovery of heat from waste heat boilers to generate steam, producing certain economic benefits. Attached Figure Description

[0010] Figure 1 is a schematic diagram of the disordered emission recovery and treatment device of the coal gasification device of this utility model;

[0011] Among them, 1-collector, 2-collector, 3-pretreatment tower, 4-inhalation fan, 5-incinerator, 6-waste heat boiler, 7-exhaust fan, 8-chimney. Detailed Implementation

[0012] The technical solution of this utility model will be further described in detail below through specific embodiments. However, it should be noted that the following embodiments are only used to describe the content of the invention and do not constitute a limitation on the protection scope of this utility model.

[0013] like Figure 1 As shown, the disordered emission recovery and treatment device of this utility model for a coal gasification unit includes collectors 1 and 2, a pretreatment tower 3, an intake fan 4, an incinerator 5, a waste heat boiler 6, an exhaust fan 7, and an emission chimney 8. The collectors 1 are set according to the disordered emission points at the site. Each collector 1 is connected to the pretreatment tower 3. The gas phase outlet at the top of the pretreatment tower 3 is connected to the intake fan 4. The outlet of the intake fan 4 is sequentially connected to the incinerator 5 and the waste heat boiler 6. The outlet of the waste heat boiler 6 is connected to the chimney 8 via the exhaust fan 7 for emission.

[0014] The collector 1 includes blow-suction type, external type, and closed type collectors, which can be reasonably selected and installed according to the actual situation of the equipment site, production operation process, equipment characteristics, etc. For example, the external type collector usually includes a gas collection hood, with an arc-shaped baffle installed inside the hood, dividing the overall large hood opening into smaller openings, which can be precisely aligned with the top of the pollution source. This greatly reduces the area of ​​the hood opening, and the corresponding exhaust volume is also reduced. A smaller suction volume can effectively recover the corresponding disorderly emission gas. As another example, the blow-suction combined gas collection hood has the characteristic that the blowing airflow velocity is reduced by tens of times compared with the suction airflow velocity. While suction is applied on one side, airflow is blown out on the other side, forming an air curtain, thus forming a blow-suction combined gas collection hood, which effectively prevents the escape and diffusion of harmful gases and improves the control effect. Because the blow-suction type collector relies on the combined blow-suction airflow to control and transport harmful gases, it has the advantages of small air volume, good pollution control effect, strong anti-interference ability, and no impact on process operation, and has been increasingly widely used.

[0015] The pretreatment tower 3 includes trays and packing material, with a spray water device added to the upper part of the tower. The exhaust gas collected by collectors 1 and 2 enters from the middle of the packing material in the pretreatment tower 3 and exits from the top. The transported gas comes into full contact with the spray water in the trays and the packing layer, absorbing useful substances while washing away dust and impurities. The pretreatment tower 3 also includes a circulation pump to recycle the spray water. Furthermore, the pretreatment tower 3 is equipped with a chemical dosing device to ensure the stability of the water quality inside the tower and maintain the pH at approximately 7-9.

[0016] To ensure normal combustion in incinerator 5, fuel gas burners, a small flow control valve group, a continuous flame, and a normal flow valve group are installed in the furnace to ensure the combustion effect of incinerator 5. The high-temperature gas after combustion is sent to the downstream waste heat boiler 6.

[0017] Waste heat boiler 6 recovers heat to generate steam, and the gas after combustion is vented and disposed of.

[0018] Collectors 1 and 2 are installed at the mill discharge port, slag-water deaerator thermal emissions, and high-temperature escaping gases during periodic slag discharge from the lock hopper, where disorderly emissions occur. These collectors are primarily located at the slag remover discharge port, pressure relief buffer tank, and methanol synthesis wastewater expansion tank. The collected emissions are first sent to the pretreatment tower 3 for washing. The gas is then transported via pipeline, powered by a suction fan 4 at the end of the pipeline. The washed gas is then sent to the incinerator 5, where a permanent flame is added to ensure complete combustion. The collected gas is then piped into the incinerator for combustion. After combustion, the gas passes through a waste heat boiler 6 for heat recovery and utilization, generating 0.5 MPa steam, thus generating economic benefits. Finally, the combusted gas is vented to the chimney 8 by an exhaust fan 7 for venting.

Claims

1. A device for recovering and treating disordered emissions from a coal gasification unit, characterized in that, The device includes a set of collectors (1, 2) set at the emission point, any one of the collectors (1, 2) being connected to a pretreatment tower (3), the gas phase outlet at the top of the pretreatment tower (3) being connected to a suction fan (4), the outlet of the suction fan (4) being connected in sequence to an incinerator (5) and a waste heat boiler (6), and the outlet of the waste heat boiler (6) being connected to a chimney (8) via an exhaust fan (7).

2. The disorderly emission recovery and treatment device for coal gasification equipment according to claim 1, characterized in that, The collectors (1, 2) are blow-suction type, external type or closed type collectors.

3. The disorderly emission recovery and treatment device for coal gasification equipment according to claim 1, characterized in that, The pretreatment tower (3) includes tower internals and packing, a spray water device is installed at the top of the tower, and a spray water circulation pump is installed at the bottom of the tower.

4. The disorderly emission recovery and treatment device for coal gasification equipment according to claim 3, characterized in that, The gas collected by the collectors (1, 2) enters from the middle of the packing of the pretreatment tower (3) and exits from the top of the tower.

5. The disorderly emission recovery and treatment device for coal gasification equipment according to claim 1, characterized in that, The pretreatment tower (3) is equipped with a dosing device.

6. The disorderly emission recovery and treatment device for coal gasification equipment according to claim 1, characterized in that, The incinerator (5) contains a perpetual flame.

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