低压缸零出力技术可有效实现热电联产机组热电解耦，提升机组供热能力和调峰能力。对某350 MW机组低压缸零出力试验方案和试验过程进行了详细分析。试验研究显示,在280 t/h供热抽汽流量下，低压缸零出力技术可降低机组负荷52 MW。受试验条件限制，为获取全负荷范围内低压缸零出力工况下机组性能，采用Ebsilon软件对低压缸零出力工况进行仿真计算。结果表明：与抽凝工况相比，低压缸零出力运行方式下，热网抽汽量可提高90 t/h，相同供热量下机组负荷可降低29%，最小电负荷率可降至28.5%，在176 MW供热负荷下供电煤耗可降低51.2 g/(kW·h)。

The zero output technology of low pressure cylinder can effectively realize the thermoelectric decoupling of heat and power cogeneration units,and improve the heating capacity and peak shaving capacity of the units.The zero output test scheme and test process of low pressure cylinder of a 350 MW unit are analyzed in detail.The experimental study shows that the zero output technology of low pressure cylinder can reduce the unit load by 52 MW under the condition of 280 t/h heating extraction steam flow.Limited by the test conditions,in order to obtain the unit performance under the zero output condition of lowpressure cylinder within the full load range,Ebsilon software is used to simulate and calculate the zero output condition of lowpressure cylinder.The results show that compared with the condensate extraction condition,the steam extraction capacity of the heating network can be increased by 90 t/h in the zero output operation mode of the lowpressure cylinder.Under the same heating capacity,the unit load can be reduced by 29%,the minimum electric load rate can be reduced to 28.5%,and the coal consumption of power supply can be reduced by 51.2 g/(kW·h) at 176 MW heating load.

TK262

京能秦皇岛热电厂汽轮机低压末级流场测量研究项目（JQRD-FW-2019-051）