High-quality coal gasification coarse slag treatment device and method

Abstract

The invention discloses a high-quality coal gasification coarse slag treatment device and method, and belongs to the technical field of coal water slurry gasification. The device is provided with an inclined submerged chain conveyor lifting section, the submerged chain conveyor lifting section is provided with a submerged chain conveyor discharging port close to the lifting top end, the submergedchain conveyor discharging port is connected with one port of an electric discharging tee joint, one of the other two ports is connected with an accident slag discharging pipe, a vibration dewateringscreen is arranged below the other port, a water collecting tank is connected below the vibration dewatering screen, the side face of the water collecting tank is connected with the submerged chain conveyor lifting section through a return pipeline, and the side face of the vibration dewatering screen is connected with the dry discharge hopper. After the technology is implemented, the content of black water in slag is obviously reduced and is normally 10-15%, and the black water is not separated out any more after the slag is loaded by a vehicle.

Description

technical field [0001] The invention belongs to the technical field of coal-water slurry gasification, and in particular relates to a high-quality coal gasification coarse slag processing device and method. Background technique [0002] For the gasification process of conventional gasification equipment, six gasification furnaces are designed, with four operating modes and one standby. The current operation mode of the gasifier is five open and one standby. The gasifier is a multi-nozzle opposed coal-water slurry pressurized gasifier. The coal input of a single furnace of the gasifier is 3000t / d. It is excreted to the slag scraper, and the slag of the slag scraper is transported to the head of the slag scraper through the scraper of the slag scraper, enters the transport vehicle through the hopper of the nose, and is transported out by the vehicle. There are 6 gasifier slag extractors, specifications and models: DLHL / GBL1.2X24, one gasifier corresponds to one slag extractor...

AI Technical Summary

Problems solved by technology

[0005] 2. Slag density and particle size

[0012] b. Disadvantages: The slag collected in the slag tank 4 is taken out by the rising section at the front of the scraper slag extractor, part of the water is precipitated in the rising section and flows back to the slag pool, and the water content of the slag loaded into the slag truck is still about 50%

After the gasification slag is loaded into the vehicle, the black water in the slag is precipitated, and the black water contains fine particles of ash, which makes the surrounding of the slag removal machine sanitary and the vehicle transportation route is polluted. There is no successful case in the industry to solve this bottleneck, and it has become a persistent problem in the industry.

[0013] In the prior art, the normal production of coal gasification equipment is 95-105t / h (dry basis) and the single gasification furnace produces 19.356t / h of coarse slag, and the water control in the lifting section of the existing slag extractor is not ideal. , the water content of the slag is 50%, the practice shows that the coarse slag has a lot of water, which is not conducive to transportation. Due to the high water content, black water will be precipitated after being loaded into a vehicle, and at the same time, there will be fine particles of ash, which will affect the sanitation around the slag removal machine; during vehicle transportation The continuous dripping of black water affects the sanitation of the transportation road surface, thereby affecting the sanitation of the environment; the dripping water on the road surface evaporates and leaves black dust, which is easy to pollute the environment; the high moisture content restricts the effective transportation volume; Environmental sanitation, recycling water resources, saving energy and reducing consumption, it is necessary to carry out technological innovation

Images