"双碳"背景下,开展生物质掺烧利用是大型燃煤机组实现降低 CO2 排放最经济、可靠的技术手段之一.该文总结国内近 15 年大型燃煤机组耦合生物质发电技术路线,并对其痛点进行剖析.首次提出和设计全链条的生物质直接耦合发电模式,并在内蒙某电厂进行实施.充分利用电厂周边边际土地科学种植沙柳能源作物,改进并开发了机械化收割及生物质破碎压型工艺和装备,把控"种植-收割-转运-储存-预处理-燃烧"全链条每一个环节,保证生物质原料稳定及低成本供应.通过电厂试验数据验证,对生物质小比例掺烧(重量比例小于 20%),推荐采用电厂零投资的"基于电厂现有制粉及燃烧设备的生物质耦合发电"技术路线;对于更大比例掺烧(重量比例大于 20%),建议采用"新增生物质独立制粉及燃烧设备的生物质耦合发电"技术路线.
Whole-chain Biomass Direct Co-firing Technology for the Coal-fired Power Plant to Reduce CO2 Emission
Under the background of China's carbon peak and carbon neutrality,the development of biomass co-firing with coal is one of the most economical and reliable technical routes for the large coal-fired power plants to significantly reduce CO2 emissions.This work summarizes the technical routes of the biomass direct co-firing in the power plant during the past 15 years,and analyzes the disadvantages.Moreover,a whole-chain biomass co-firing mode is proposed and implemented for the first time in a power plant in Inner Mongolia:the desert marginal land is reserved to plant Salix psammophila near the power plant;the devices of the mechanized harvesting and biomass crushing are modified;the whole-chain technical route of"plant-harvest-transport-storage-pretreatment-combustion"is adopted to provide the stable and low-cost biomass.Based on the field test data,when the biomass co-firing ratio is less than 20%,the technical route of"biomass co-firing in power plants based on the existing pulverizing and combustion equipment"with zero investment is recommended.When a large proportion of biomass is combusted with coal in the power plant,the technical route of"biomass co-firing in power plants with additional biomass independent pulverizing and combustion equipment"is preferential.
coal-fired power plantbiomass co-firingdirect co-firingCO2 emission reduction
国家科技期刊平台
NSTL
万方数据
维普
