Boiler bottom structure of submerged scraper conveyor in thermal power plant

Abstract

The invention discloses a boiler bottom structure of a submerged scraper conveyor in a thermal power plant. A transitional slag pit and a boiler bottom deslagging device are arranged between a boiler and the submerged scraper conveyor, and a boiler bottom is sealed between the boiler and the transitional slag pit through a mechanical sealing device. The boiler bottom deslagging device comprises hydraulic shutoff doors which all horizontally move during opening or closing. The mechanical sealing device absorbs expansion displacement of the boiler and seals the boiler bottom at the same time, the problems that the water level of a water seal tank cannot be controlled easily and periodical cleaning is needed are solved, and the hydraulic shutoff doors can be flexibly opened and closed, can serve as isolation doors and can effectively achieve pre-cooling and pre-crushing of large slag blocks. A system is safe and reliable, operation is easy, running is convenient, and the functions of large slag pre-crushing and temporary storage, non-stop overhaul of the submerged scraper conveyor and slag water ultralimit high-temperature protection of the submerged scraper conveyor are achieved.

Description

【Technical field】 [0001] The invention relates to the technical field of slag discharge for pulverized coal-fired boilers, and in particular to a furnace bottom structure of a scraper slag scraper in a thermal power plant. 【Background technique】 [0002] At present, when domestic and foreign pulverized coal-fired boilers and other slag discharge adopt scraper slag removal machine, there are mainly the following methods for furnace bottom slag discharge: [0003] Method 1: There is a transition slag well between the scraper slag extractor and the boiler, and there is a water seal groove between the transition slag well and the lower header of the boiler. The water level inside and the slag well are sealed. There is a hydraulic shut-off door under the transitional slag well, which is opened and closed by swinging. When it is opened, it is arranged vertically. It is inserted into the tank of the scraper slag extractor as the water seal plate of the boiler. When it is closed, i...

AI Technical Summary

Problems solved by technology

This method has no transitional slag well, and cannot realize the temporary storage of slag and large slag crushing functions. It is impossible to enter the scraper slag machine for maintenance during operation. It is necessary to lower the water level of the scraper slag machine to below the upper roller bearing. During the maintenance operation, the seal of the boiler furnace was damaged due to the lowering of the water level in the scraper scraper, and a large amount of cold air leaked in. There have been many trip accidents of the boiler fire extinguishing unit due to the damage of the water seal of the scraper scraper, which caused serious damage to the power plant. big economic loss

The temperature of the slag water in the tank is maintained at 50-70°C when the scraper scraper is running, and it can reach a high temperature of 80°C when the boiler is blowing soot. When hot slag falls into the scraper scraper, the slag water often splashes out. For the above two connection methods between the boiler and the scraper slag remover, it is unavoidable that large pieces of coked hot slag weighing several tons fall directly into the groove of the scraper slag remover from the height of the boiler furnace during operation, causing the scraper to scrape The slag water in the slag machine evaporates instantly, and the slag water and water vapor splash out. There have been many personal injury accidents in China caused by the leakage of hot water and water vapor after the large slag fell into the scraper slag machine.

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