Slag water self-balancing heat exchange method of water-cooled mechanical slag-removal system in thermal power plant

Abstract

The invention relates to a slag water self-balancing heat exchange method of a water-cooled mechanical slag-removal system in a thermal power plant, and refers to the slag removals of fire coal powder boiler and the like, the hot slag and the heat transfer medium of the cooling water are adopted to satisfy effective pelletization and cooling to the hot slag in a water-cooled mechanical slag-removal system; a slag conveyor is in operation manners that the slag water cannot overflow and the water level is maintained, and external slag water processing systems are not used for cooling; the upper limit of the slag water temperature, which is regularly specified at 60, is maximally determined at 80 DEG C; the evaporation rate of the slag water is increased and the discharged heat is increased along the raise of the slag water temperature, and the hot slag is cooled to reach energy conservation; the mass balance of the slag water is realized through quantitative supplementing of water, the temperature of the slag water and the liquid level are controlled through an automatic monitoring control technique, the slag water cannot overflow, and the slag water is in a controllable self-balancing state; and the urgent water supplementing is carried out in an accident state that the temperature of the slag water exceeds 80 DEG C to quickly lower the temperature, the overflowed water is collected in an accident overflow pool, and can be recycled and used after the system is stable.

Description

【Technical field】 [0001] The invention relates to the technical field of slag discharge for pulverized coal-fired boilers, and in particular to a slag-water self-balanced heat exchange method for a water-cooled mechanical slag removal system in a thermal power plant. 【Background technique】 [0002] At present, when domestic and foreign coal-fired boilers and other slag discharge adopt water-cooled mechanical slag removal system, most of the hot slag cooling adopts a closed cycle operation mode with cold slag water overflow recovery, treatment and reuse. overflow state, and ensure that the temperature of the mixture in the tank of the slag extractor is not greater than 60°C. There are mainly the following ways: [0003] Method 1: The slag water closed cycle is cooled by a slag water cooler. The overflow water of the scraper slag remover first overflows to the buffer water tank, and is pumped by the slag water circulating water to the automatic backwash filter and the slag w...

AI Technical Summary

Problems solved by technology

The advantage is that the water consumption is small and the pipeline is simple; the main disadvantage is that there are many equipments, the operation is slightly complicated, the energy consumption is high, and the problem of scaling

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