脱硫装置中百叶窗式挡板门密封节能优化方案

Energy-saving program optimization for louver baffle seal

介绍利用脱硫前原烟气的热量加热密封风的量及换热量的理论计算方法。以某300MW机组脱硫装置为例,比较密封风分别采用气-气换热、电加热和蒸汽加热3种方案的配置、投资成本及运行费用。结果表明,采用气-气换热方案的投资成本比电加热方案高42万元,比蒸汽换热方案高48万元,但采用气-气换热方案较电加热器方案节约运行费162.4万元/年,3个月即可收回初投资。气-气换热用于密封风加热方案系统相对较复杂、投资费用相对较高,但其运行费用较低,优势明显,适用于各种锅炉烟气脱硫装置。

To reduce the energy consumption of heating damper seal air,the flue gas before desulfurization was used to heat the seal air.The theoretical calculation method for seal air volume and heat transfer quantity was presented in detail.Take the desulfurization equipment on a 300 MW unit as the example,the configuration,investment and running cost of three seal air heating schemes(by gas-gas heat exchanger,electric heat exchanger and steam heat exchanger)was compared.The results showed that,the investment cost of gas-gas heating scheme was 4.2×105 yuan and 4.8×105 yuan higher than that of the electrical heating and steam heating scheme,respectively.However,compared to electric heating scheme,the gas-gas heating scheme can save running cost of 1.624×106 yuan per year and can recover the investment in 3months.Although the system is complicate and the investment cost is high,with low running cost,the gas-gas heating scheme has obvious advantages and is suitable for flue gas desulfurization equipments in all kinds of boilers.