太阳能集热器与燃煤机组回热系统耦合的性能研究

Performance research on thermal regenerative system coupling solar collector with coal-fired unit

提出了利用LS-3型抛物面槽式太阳能集热器对燃煤机组凝结水或给水进行辅助加热的两种集成方案,分别对N300-16.67/537/537,N600-24.2/566/566,N1000-25/600/600等3种不同型号的机组进行经济性能评价。研究结果表明:与大容量机组相比,小容量燃煤机组的投资节煤比较大,节煤量较大,投资成本较小;集成系统热经济性随太阳能集热系统辅助加热的凝结水(给水)流量比率的增大而提高,投资节煤比则相反;用太阳能集热器加热给水泵出口到省煤器入口的水,对改善机组热经济性和降低投资成本有利;在太阳能辐射强度1 000 W/m2的情况下,N300-16.67/537/537型机组的流量比率为5%时,节煤率为3.29 g/kWh。

Two integration solutions were put forward,which heat the condensate or feed water of the coal-fired unit by using type of LS-3 parabolic trough solar energy collector, the economic performance of the unit such as type N300-16.67/537/537, N600-24.2/566/566 and N1000-25/600/600 has been evaluated respectively. The results show that coal saving investment ratio （the ratio of coal saving to investment） of small capacity coal-fired unit is larger, more coal saving, less investment cost, comparing with large capacity units ;The thermal economy of integration system improves with increasing flow rate of the condensate water （feed water） through the auxiliary heating solar system, coal saving investment ratio is just the opposite ;To heat the water from the water pump outlet to economizer inlet by the solar collectors is better to increase the thermal economy and decrease the investment cost. N300-16.67/537/537 type unit saves coal 3.29 g/kWh at solar radiation intensity of 1 000 W/m2 and the flow rate of 5%.