中温中压垃圾焚烧发电机组提效改造研究

Research on Improving Efficiency and Transformation of Refuse-fired Generators Set with Mid-temperature and Mid-pressure

针对中温中压等级垃圾焚烧发电机组发电效率偏低的现状,研究了主蒸汽参数提级、增设再热循环和余热回收利用装置等措施,同时选取某15 MW机组分别按中温次高压和中温次高压再热方案进行改造分析,评价机组改造后的性能参数和经济效益。结果表明:采用中温次高压改造技术方案后,锅炉受热面质量增加9%,发电效率提高1.52个百分点,垃圾发电量增加43 kW·h/t,改造费用约为2005万元,管材更换费用增加657万元,内部收益率为17.47%,投资回收期为6.31 a;采用中温次高压再热改造技术方案后,锅炉受热面质量增加24%,发电效率提高2.35个百分点,垃圾发电量增加64 kW·h/t,改造费用为2490万元,管材更换费用增加1363万元,内部收益率为21.53%,投资回收期为5.15 a。研究结果可为中温中压垃圾焚烧发电机组改造提供参考。

In view of the low power generation efficiency of refuse-fired generators set with mid-temperature and mid-pressure,the quality and efficiency improvement measures such as upgrading main steam parameters,adding reheat cycle and waste heat recovery and utilization device were researched.A 15 MW refuse-fired generators set was selected to analyse,according to mid-temperature and sub-high pressure scheme and mid-temperature,sub-high pressure and reheating scheme respectively,the performance parameters and economic benefit after transformation were analysed.Results show that,after the application of mid-temperature and sub-high pressure technology scheme,the mass of boiler heating surface increases by 9%,the power generation efficiency increases by 1.52 percentage points,the waste power generation increases by 43 kW·h/t,the transformation cost is about 20.05 million yuan,the cost of pipes replacement increases by 6.57 million yuan,the internal rate of return is 17.47%,and the investment payback time is 6.31 years.After the application of mid-temperature,sub-high pressure and reheating technology scheme,the mass of boiler heating surface increases by 24%,the power generation efficiency increases by 2.35 percentage points,the waste power generation increases by 64 kW·h/t,the transformation cost is 24.90 million yuan,the cost of pipes replacement increases by 13.63 million yuan,the internal rate of return is 21.53%,and the investment payback time is 5.15 years.The research results can provide some reference for the application of reconstruction engineering for refuse-fired generators set with mid-temperature and mid-pressure.