低热值煤电厂配煤技术研究进展

Development tendency of coal blending technologies in coal-fired power plants burning low calorific value coal

针对低热值煤电厂单一来源燃煤偏离设计煤种，造成运行不稳、成本高等问题，系统论述了动力配煤的主要技术，分析了配煤工艺、设备及管理现状，并对山西境内5个电厂燃煤资源及煤质情况进行实地调研，结合煤质来源不稳定，煤种多，煤质复杂的情况，提出了基于煤质在线检测的无筒仓的封闭式储混配煤控制系统。结果表明，该系统考虑燃料全局管理，最终实现基于无筒仓的实时在线配煤，在大规模储煤的情况下，实现高效、精确、自动化配煤。可减少煤炭长期储存带来的热值损失，以及资金占用带来的成本增加，预计节约成本1％，降低煤耗1％-2％；可降低SO2、NOx的瞬时大量生成，减少瞬时超标排放的频次。无筒仓的封闭式储混配煤控制系统为实施配煤自动控制提供了一种新的方法，保证燃料的稳定供给。

Single and non-ideal coal led to unstable operation and high cost of coal-fired power plants which burnt low calorific value coal. The main technologies, equipments and management situation of coal blending were discussed. The coal resources and properties of five Shanxi coal-fired power plants were investigated. Overall design principle and objective were proposed based on the on-line analyzed results. A closed coal storing and blending control system without coal silo was designed. The system could blend coal efficiently and auto- matically even there were large coal. The system could reduce the cost by 1% , the coal loss were decreased by 1% to 2%. Benefit from the system ,there wasn＇t large SO2 ,NOx emission in a short time. The system also improved coal blending efficiency and stabilized the fuel supplement.