热电联产减温减压器供热优化分析

减温减压器供热由于节流损失能耗大，削弱了热电联产的节能优势。小型热电联产，改用工业蒸汽热能驱动背压式汽轮机供热，同时替代电力拖动给水泵，增加了给水的安全可靠性，降低了厂用电消耗，实现能量的梯级利用，减小能量转换中的各项损失。背压式汽轮机能用变速方式调节给水量和压力，在机组变负荷时给水压力和流量不再依靠阀门调节，避免大量节流损失。研究可知，减温减压器改汽轮机供生产蒸汽2t/h，可增加发电量75kW·h；该技术系统设备投资回收周期短，技术成熟，节能效果显著。

Optimization analysis on heat supply of combined heat and power temperature and pressure reducter

Owing to the throttling losses, the large energy consumption for temperature and pressure reducer heating weakened energy- saving advantages of cogeneration. For small cogeneration, industrial steam heating was used to drive the back- pressure steam turbine and substitute for electric power to drive the feed- water pump, which strengthened safe reliability for water supply, reduced power consumption, achieved cascade utilization of energy and decreased the losses in energy conversion. Back- pressure steam turbine could adjust the water supply and pressure by means of variable speed regulation. Therefore, adjustment for the pressure and flow of water supply did not depend on regulating valve any more in the case of varying load of the steam turbine being, which avoided huge throttling losses. The electric energy production increased by 75kW·h on the condition that the steam flow provided by the temperature and pressure reducer turbine was 2t/h. The technology,for which the payback period of equipment investment was short, had been matured and exhibited obvious energy saving.