定洲电厂脱硫烟气系统的设计和运行分析

介绍了河北省定洲电厂石灰石-石膏湿法FGD装置烟气系统的设计情况,重点对FGD系统气气换热器(GGH)差压大对系统阻力的影响从设计和运行方面进行了剖析,并提出了解决方案。系统分析了脱硫系统各部分阻力,针对GGH差压问题,分析了其对脱硫系统的电耗影响。停机后检查发现GGH冷端已发生石膏板结现象,无法通过压缩空气吹灰清除。利用停机检修时间,通过高压水冲洗试验,验证了在GGH冷端加装吹灰器的有效性,并在实际工程中实施,起到了很好的效果。并制定了运行控制措施:在GGH低温端加装高压清洗吹灰器,根据系统阻力增加情况,定期或不定期进行清洗,保证GGH差压维持在总阻力1.3kPa以下;调整除雾器清洗周期,保持其低阻力运行;加强锅炉运行调整,使排烟温度在设计范围内。

Design and Operation Analysis of Wet FGD System in Dingzhou Power Plant

The design of wet FGD system of Hebei Dingzhou Power Plant is introduced.The influence of GGH differential pressure of FGD system on system pressure is analyzed from design and operation aspects.The solution scheme for the above problem is proposed.All resistance of the FGD system and the influence of the GGH press difference on electricity consumption are analyzed.After the unit is stopped,the concretionary gesso is found in the cold side of GGH,and there is no method to clear up them by compressed air.The method of adding ash-blower in the cold side of GGH during the unit repair is proved to be effective by the high-pressure-ashing test,and has achieved good effect in real application.Some control measures are taken for unit operation,such as,adding high pressure ash-blower on the cold side of GGH,clearing up regularly according to the serious degree of the added resistance to guarantee the total resistance of GGH press difference under 1.3 kPa,regulating the demister-cleaning period to keep the running in low resistance,and regulating the equipment in the boiler side to keep the temperature in design range.