Deep recovery and optimization of waste heat and energy quality for coal-fired units
In response to significant increase in energy consumption caused by low-grade waste heat and energy waste in coal-fired power plants,a 350 MW unit is selected as the research object,the Ebsilon software is used to model and simulate different deep recovery schemes for low-grated waste heat and residue.The operating data of the unit under two schemes of"organic Rankine cycle(ORC)"and"Heater"are calculated.The energy consumption characteristics,revenue characteristics and differences are analyzed,and the mechanism and optimization plan for deep recovery of waste heat and energy are obtained.The results show that,the energy consumption characteristics of the unit improve significantly under both schemes,and the"heater"scheme has lower energy consumption.As the organic working fluid flow rate increases,the power generation of the ORC system gradually increases,but the thermoelectric efficiency of the ORC system gradually increases at first and then tends to stabilize and has a downward trend,with a range of 6.94%～7.75%.The organic working fluid flow rate has a relatively small effect on circulation efficiency of the ORC system.Both schemes are technically and economically feasible.The"ORC"scheme can bring direct electricity benefits to the power plant,while the"Heater"scheme is slightly more economical.
coal-fired power unitwasted heat and substancedeep recyclingORCoptimization
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