基于炉烟的生物质炭化系统研究

Study on Biomass Carbonization System Based on Furnace Smoke

为解决生物质在锅炉内燃烧易结焦、氮氧化物排放不稳定且极易超标的问题,研究设计炉烟炭化生物质系统。以某超超临界燃煤机组抽取的炉烟为热介质,分析秸秆颗粒在干燥和炭化反应过程的物态变化和炭化产物,研究表明:利用炉烟炭化生物质系统可以实现生物质燃料的全面炭化,同时将焦油和挥发分喷入锅炉燃烧,灰分和固定碳保留在生物质炭中。改造后的锅炉没有灰熔点降低和氮氧化物排放超标的风险,燃料消耗量也相应降低,生物质炭可作为成品对外出售,经济和环境效益显著。

In order to solve the problems that biomass is easy to coke and nitrogen oxide emission is unstable and easy to exceed the standard in boiler combustion,a furnace smoke carbonization biomass system has been studied and designed.Taking the furnace smoke extracted from an ultra-supercritical coal-fired unit as the thermal medium,the physical state changes and carbonization products of straw particles in the process of drying and carbonization reaction are analyzed.The research shows that the comprehensive carbonization of biomass fuel can be realized by using the furnace smoke carbonization biomass system.At the same time,tar and volatile components are injected into the boiler for combustion,and ash and fixed carbon are retained in the biomass carbon.The reformed boiler has no risk of reducing ash melting point and exceeding NO_(x) emission,and the fuel consumption is also reduced accordingly.The biomass carbon can be sold as a finished product,with remarkable economic and environmental benefits.