2×1000MW机组WFGD布置优化及主要技术经济指标研究

Research on the arrangement optimization and main technical and economic targets of wet FGD for 2×1000 MW power unit

对煤收到基硫分高低、烟气量大小、是否设置GGH(烟气换热器)等对WFGD布置优化及主要技术经济指标的影响进行了分析。认为国内现设计的2×1 000MW机组WFGD布置应根据我国南方、北方地区的特点及是否设置GGH等条件进行优化:对于南方地区,不带GGH时,WFGD每MW占地能够控制在4．9 m2以内,带GGH时,WFGD每MW占地能控制在7．3 m2以内;对于北方地区,不带GGH时,WFGD每MW占地能控制在5．9 m2以内,带GGH时,WFGD每MW占地能控制在8．54m2以内。2×1 000 MW机组WFGD当设置GGH时,厂用电率比不设GGH时全厂厂用电率增加0．2％左右。影响WFGD工艺水耗量的主要是烟气量大小和是否设置GGH,当烟气量为440万m2/h且设置GGH时,WFGD带GGH比不带GGH节水87 t／h。应根据工程特点及煤种情况对WFGD布置优化,并考虑WFGD是否设置或取消GGH。

The effects of sulfur content in coal, flue gas flow and GGH installation on the WFGD arrangement optimization as well as the technical and economic target were analyzed. Taking the home-designed 2 ×1 000 MW power units for instant, the WFGD arrangement optimization should be carried out based on the local conditions and the installation of GGH. Typically, the unit coverage of WFGD without GGH can be controlled within 4.9 m^2/MW in south area, and within 7.3 m^2/MW for WFGD with GGH; The corresponding data in north area would be 5.9 m^2/MW and 8.54 m^2/MW respectively. Equipped with GGH, the self-service power consumption is 0.2% more than that of WFGD without GGH. Major factors contributing to the.water consumption of WFGD are flue gas flow and installation of GGH. If the flue gas flow is 4.4Mm^3/h, the water consumption of W FGD with GGH is 87 t/h less than that without GGH.