600 MW燃煤机组SO2、烟尘综合治理技术经济性分析

针对燃煤电厂烟尘、SO₂超低排放要求，简述目前多采用的高效脱硫技术，脱硫系统协同除尘技术和湿式电除尘器技术。以某燃用高硫、高灰煤600 MW机组SO₂、烟尘超低排放改造为例，在技术参数、工程量、适应能力、投资及运行成本方面，对双塔双循环脱硫协同除尘方案（方案1）及双塔双循环+湿式电除尘器脱硫除尘方案（方案2）进行技术经济比较。由比较结果可知，方案1的改造工程量、检修维护工作量及增加的厂用电耗小于方案2；方案2在机组负荷和入口烟尘浓度适应性、烟尘理化特性敏感度、运行稳定性方面优于方案1；方案2的总投资费用、运行维护成本高于方案1，但能够进一步协同脱除SO₃，有助于消除蓝色烟羽现象。

Techno-Economic Analysis on Comprehensive SO2 and Dust Treatment Technologies of 600 MW Coal-Fired Units

In view of the requirements of ultra-low SO₂ and dust emission in coal-fired power plants, the currently widely-used technologies of high-efficiency desulfurization, collaborative dust removal of desulfurization system and wet electrostatic precipitator have been briefly described. Taking the example of ultra-low SO₂ and dust emission renovation in 600 MW units burning coal with high sulfur and high ash content, the techno-economic assessment has been performed to study the scheme of double-tower double-cycle collaborative desulfurization and dust removal (i.e. scheme one) and the scheme of double-tower double-cycle design equipped with wet electrostatic precipitator (i.e. scheme two) in terms of technical parameters, engineering work load, adaptability, investment expense and the cost of operation. The comparison result shows that the scheme one comes with less renovation engineering work load, maintenance work load or additional auxiliary power consumption of power plant, while scheme two has advantages over scheme one in the aspects of the adaptabilities of unit load and inlet dust concentration, the physicochemical property sensitivities of dust and the operation stability. Although the total investment expense and the cost of operation and maintenance of scheme two are higher than those of scheme one, scheme two is capable of promoting further collaborative SO₃ removal and contributing to eliminating the issue of blue smoke plume.