基于数据集成的GTCC进气余热制冷的经济评价

Economic Evaluation of GTCC Inlet Air Cooling Based on Numerical Integration

为更准确地评价燃气-蒸汽联合循环(GTCC)进气冷却方案,提出了基于数据集成的进气余热制冷经济评价方法.该方法综合了GTCC系统的进气温度特性、进气冷却系统的变工况特性、机组负荷规律以及当地全年标准气象参数等.对华南地区某GTCC进气余热制冷方案的经济评价表明,进气温度每降低1℃,联合循环功率约增大0.5%,而热耗率变化不大.对进气温度从环境温度(30℃)冷却至10℃的冷却方案,按当地气象条件,进气温降年平均可达16℃,GTCC年功率增大8.27%,热耗率增大1.03%,当增容尖峰电价为1.00元/(kW·h)及油价为2200元/t时,投资回收期约两年.

In order to correctly evaluate the validity of the scheme of GTCC （Gas-Steam Combined Cycle） inlet air cooling, a method based on numerical integration is presented, which integrates the temperature characteristics of the GTCC inlet air, the off-design performance of the inlet air cooling system, the loading rules of the machine and the local yearly standard weather data, etc. The economic evaluation to the scheme of GTCC inlet air cooling in a power plant located in South China is then carried out, with the results showing that, for every 1 ℃ inlet air temperature depression, the GTCC output power increases by 0.5 %, while the heat rate varies slightly. Furthermore, the results of the scheme of cooling the inlet air temperature from the ambient temperature （30 ℃ ） to 10 ℃ show that, in the local weather conditions, an annual average temperature decrease of 16 ℃ of the inlet air can be obtained, as well as an annual output power increase of 8.27% and a fuel consumption rate increase of 1.03%. It is also shown that the payback period approximately amounts to 2.0 years when the peak power price is 1. 00 Yuan/（ kW · h） and the fuel cost is 2 200 Yuan/t.