生物质炉排炉超低排放技术研究

Study on ultra-low emission technology of biomass grate furnace

总结了生物质炉排炉目前污染物排放控制措施,分析了各项措施的优缺点,提出“达标第一、综合治理”的控制理念,以反应机理为基础,从燃烧调整角度控制原始排放,优化改造实现脱除能力,动态控制实现最终目标,在实现脱硫、脱硝达标基础上,尽量降低改造及运行成本。通过实际项目应用结果表明:生物质炉排炉通过燃烧优化、逻辑优化、脱硝系统改造、脱硫系统改造,最终可以实现脱硫、脱硝超低排放运行,即SO_(2)≤35 mg/m^(3),NOx≤50 mg/m^(3)。同时此方法可有效降低原始排放,并提升锅炉效率,经燃烧控制逻辑优化后,NO_(x)原始生成量降低50~70 mg/m^(3),SO_(2)原始生成量降低5~10 mg/m^(3),炉内CO含量由之前的8 000~11 000 mg/m^(3)降至1 000~4 000 mg/m^(3)。

The current pollutant emission control measures for biomass grate furnaces were summarized,the advantages and disadvantages of each measure were analyzed,and the control concept of"standard first,comprehensive treatment"was put forward.Based on the reaction mechanism,the original emission was controlled from the perspective of combustion adjustment.Optimize the transformation to achieve removal capacity,dynamic control to achieve the ultimate goal,and reduce the transformation and operation costs as much as possible on the basis of achieving desulphurization and denitrification standards.Through practical project application,the results showed that biomass grate furnace can finally achieve ultra-low emission operation of desulfurization and denitration through combustion optimization,logic optimization,denitration system transformation,and desulfurization system transformation,that was SO_(2)≤35 mg/m^(3),NO_(x)≤50 mg/m^(3).At the same time,this method can effectively reduce the original emission and improve the boiler efficiency.After the optimization of combustion control logic,the original generation of NO_(x) was reduced by about 50~70 mg/m^(3),and the original generation of SO 2 was reduced by about 5~10 mg/m^(3).The CO content in the furnace was reduced from 8000~11000 mg/m^(3) to 1000~4000 mg/m^(3).