600MW机组干式除渣系统应用研究

Study of the Optimization and Application of a Dry Type Slag Removal System for 600 MW Units

针对某电厂600 MW机组的干式排渣系统进行了应用试验,通过测量锅炉排烟温度、飞灰含碳量、炉渣含碳量、炉渣冷却风入炉温度、排渣温度、排渣量等参数,研究了干除渣系统对锅炉效率的影响,并对整个锅炉系统进行优化。研究表明:炉底进风的临界温度为247.3℃,风温若低于临界温度则随着冷却风风量的增加,锅炉效率逐渐降低;600 MW机组采用干除渣系统后,锅炉效率提高约0.023%,解决了改造初期出现的排烟温度高,钢带机卡涩的问题。

An optimization and applied experiment were performed of a 600 MW unit dry type slag removal system in a power plant. Through measuring the exhaust flue gas temperature of the boilers,carbon content of flying ash,carbon content of slag,temperature of the air cooling the slag when entering into the furnace,slag temperature and the quantity of slag when discharged etc. parameters,the authors studied the influence of the slag removal system on the boiler efficiency and optimized the whole boiler system. It has been found that the critical temperature of the air fed from the bottom of the furnace should be 247. 3 ℃. If the temperature of the air is lower than this critical temperature,the boiler efficiency will gradually decline with an increase of the amount of cooling air. After a dry type slag removal system has been adopted for a 600 MW unit,the boiler efficiency will increase by about 0. 023%,thus solving the problem that there emerged a high temperature of flue gases in the initial stage of the reconstruction and the steel belt conveyer got stuck.