1000MW超超临界汽轮机排汽焓和冷端能量损失模型
发布时间：2018-08-09 13:08
【摘要】：建立凝汽式汽轮机冷源损失热量和排汽焓的计算模型,实时分析负荷和机组状态对冷端损失、低压缸排汽湿度和凝汽器总体换热系数的影响规律。基于别尔曼公式的形式,提出凝汽器总体换热系数的经验预测公式。结果表明,冷端能量损失百分比随负荷增大而单调降低。冷端能量损失占机组总输入能量的48.4%,占总能量损耗的85%~88%。低压缸排汽焓随负荷增加而单调降低,排汽湿度随负荷增加而单调增大。低负荷下,低压缸排汽为微过热蒸汽;高负荷下,低压缸排汽为饱和湿蒸汽。凝汽器总体换热系数随负荷增加而单调增加,且正比于低压缸排汽流量。
[Abstract]:The calculation model of cooling source heat loss and exhaust enthalpy of condensing steam turbine is established, and the influence of load and unit state on cold end loss, low pressure cylinder exhaust humidity and overall heat transfer coefficient of condenser is analyzed in real time. Based on the form of Vielman formula, an empirical prediction formula for the total heat transfer coefficient of condenser is presented. The results show that the percentage of energy loss at the cold end decreases monotonously with the increase of load. The energy loss at the cold end accounts for 48.4% of the total input energy of the unit, and 858.88% of the total energy loss. The exhaust enthalpy of low pressure cylinder decreases monotonously with the increase of load, and the exhaust humidity increases monotonously with the increase of load. Under low load, the exhaust steam of low pressure cylinder is slightly superheated steam, and the exhaust steam of low pressure cylinder is saturated wet steam at high load. The overall heat transfer coefficient of the condenser increases monotonously with the increase of the load and is proportional to the exhaust flow of the low pressure cylinder.
【作者单位】： 国电浙江北仑第一发电有限公司;国电集团国电电力发展股份有限公司;
【分类号】：TM621
[Abstract]:The calculation model of cooling source heat loss and exhaust enthalpy of condensing steam turbine is established, and the influence of load and unit state on cold end loss, low pressure cylinder exhaust humidity and overall heat transfer coefficient of condenser is analyzed in real time. Based on the form of Vielman formula, an empirical prediction formula for the total heat transfer coefficient of condenser is presented. The results show that the percentage of energy loss at the cold end decreases monotonously with the increase of load. The energy loss at the cold end accounts for 48.4% of the total input energy of the unit, and 858.88% of the total energy loss. The exhaust enthalpy of low pressure cylinder decreases monotonously with the increase of load, and the exhaust humidity increases monotonously with the increase of load. Under low load, the exhaust steam of low pressure cylinder is slightly superheated steam, and the exhaust steam of low pressure cylinder is saturated wet steam at high load. The overall heat transfer coefficient of the condenser increases monotonously with the increase of the load and is proportional to the exhaust flow of the low pressure cylinder.
【作者单位】： 国电浙江北仑第一发电有限公司;国电集团国电电力发展股份有限公司;
【分类号】：TM621
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