烟气抽取位置对抽烟气干化污泥耦合发电机组的影响

Effects of flue gas extraction position on sludge-coal blending combustion generation units

为了掌握燃煤发电机组抽烟气干化污泥后掺烧对锅炉运行参数的影响规律,针对某电厂300MW等级燃煤发电机组,通过热平衡和热力校核计算分析了该机组在BMCR、75%THA、50%THA和30%THA工况时,抽烟气干化污泥后掺烧对烟气抽取比例、锅炉热效率、燃煤量、烟气温度及减温水量等参数的影响。结果表明:掺烧污泥会影响锅炉主要运行参数,且影响幅度随机组负荷的降低和抽取点烟温的降低而增加;综合考虑现场施工和改造成本等因素,建议选择低温过热器出口作为烟气抽取点。

To study the influence of blending flue gas dried sludge on operating parameters of the coal-fired boiler, thermal balance and thermal check calculation was carried out for a 300 MW unit, and the effects of sludge-coal co-combustion on such parameters as flue gas extraction ratio, boiler thermal efficiency, coal consumption, flue gas temperature and spray water flux were analyzed, under the load of BMCR, 75%THA, 50%THA and 30%THA. The results show that, blending sludge will cause deterioration of the boiler main parameters, and the influence degree increased with the decrease of unit load and flue gas extraction temperature. Comprehensively considering the site construction and retrofit costs, low temperature superheater outlet is suggested to be a proper position for flue gas extraction.