Research & Analysis
Wen Zhe, Liu Kun, Zhao Wen
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.
