锦界电厂600MW机组脱硫除尘系统改造研究

发布时间：2019-04-02 16:33

【摘要】：随着经济的发展,环境问题日趋严重,环保部关于大气污染物的排放标准也日趋严格。为响应国家环保政策,国华电力公司制定了“高品质绿色发电”计划,倡导烟气污染物“近零排放”,即烟尘、SO2和NOX排放浓度限值分别为5、35和50(mg/Nm3),对火电厂污染物排放的控制提出了更高要求。为进一步落实新的超低排放标准,国华锦界能源有限责任公司需要对其二期2台600MW亚临界直接空冷机组脱硫除尘系统实施改造。本文以该公司二期2台600MW亚临界直接空冷机组脱硫除尘系统为研究对象,对其污染物排放情况进行了调研与评估,考虑到本次改造脱硫及协同除尘效率要求高以及需充分利用现有设备等情况,提出了一些相应的改造方案并进行了分析比较,确定了SPC超净脱硫除尘一体化和烟囱雨酸液收集系统技术改造方案并实施之。对改造后的脱硫除尘系统进行了性能试验和效益评估,分析了其改造效果。结果表明:脱硫除尘系统改造后,锅炉在不同工况下燃用校核煤种时,脱硫效率均在99%以上,超过了设计值98.3%,且脱硫出口SO2浓度不高于25mg/Nm3,烟囱入口烟尘浓度不高于5mg/Nm3,烟气携带液滴浓度小于20mg/Nm3,消减了石膏雨现象;每年可削减SO2排放量约550t、烟尘排放量462t,排污费减少97.59万元,节省厂用电及费用分别为1.87×106 k W?h和26.18万元,经济效益明显。达到了预期的改造效果,产生了良好的环境正效应和社会效益。
[Abstract]:With the development of economy, the environmental problems are becoming more and more serious, and the emission standards of air pollutants of the Ministry of Environmental Protection are becoming more and more strict. In response to the national environmental protection policy, Guohua Electric Power Company has formulated a "high-quality green power generation" program, advocating "near-zero emissions" of flue gas pollutants, namely smoke, SO2 and NOX emission concentration limits of 5,35 and 50 (mg/Nm3), respectively. Higher requirements are put forward for pollutant emission control in thermal power plants. In order to further implement the new ultra-low emission standard, Guohua Jinjie Energy Co., Ltd needs to reform its second stage 2 600MW sub-critical direct air cooling unit desulphurization and dust removal system. In this paper, two 600MW sub-critical direct air-cooling unit desulfurization and dedusting system in the second phase of the company are taken as the research object, and the pollutant emission of the system is investigated and evaluated. Considering the high requirement of desulphurization and co-dedusting efficiency and the need to make full use of the existing equipment, some corresponding retrofit schemes are put forward and analyzed and compared. The integration of SPC ultra-clean desulfurization and dust removal and the technical transformation scheme of chimney rain acid collection system are determined and implemented. The performance test and benefit evaluation of the reformed desulphurization and dedusting system are carried out, and the retrofitting effect is analyzed. The results show that the efficiency of desulfurization is over 99%, which exceeds the designed value of 98.3%, and the concentration of SO2 at the outlet of desulphurization is not higher than 25 mg / m ~ (3), when the boiler is burning and checking coal under different working conditions after the reformation of the desulfurization and dust removal system. The smoke concentration at the entrance of the chimney is less than 5 mg / m ~ 3 and the concentration of droplets carried by the smoke is less than 20 mg / m ~ 3, which reduces the gypsum rain. The annual emission of SO2 is about 550 t, the emission of smoke and dust is 462 t, the sewage charge is reduced by nine hundred and seventy five thousand nine hundred yuan, the power consumption and the cost are 1.87 脳 10 ~ 6 kW / h and two hundred and sixty one thousand seven hundred and ninety nine yuan, respectively. The economic benefit is obvious. The expected transformation effect has been achieved, and good environmental positive effect and social benefit have been produced.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621.73

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