热压机喷射性能计算及探究

Calculation Method and Analysis on Thermal Compressor Ejection Characteristics

热压机技术作为电站灵活性改造的重要手段,其极限喷射能力的大小对电站改造方案的可行性评估意义重大。本文通过对热压机内部涉及的物理过程进行理论推导,建立了计算热压机可达最大喷射系数的理论模型。研究结果表明,当前计算模型可以很好地描述热压机的喷射能力,在最大喷射系数的计算方面具备较高的精度和适用性。与此同时,模型计算结果表明,热压机喷射能力随工作蒸汽和引射蒸汽压力的增加而增大,随压缩蒸汽压力的增加而减小;工作蒸汽过热度的增加对喷射能力的提升起积极作用,而引射蒸汽的过热度变化不会引起喷射能力出现显著改变。

The utilization of thermal compressors is an important way to exceed flexibility transformation of thermal power plants. The extreme ejection ability of thermal compressors is significant for the feasibility evaluation of transformation strategy.The present research conducts theoretical derivation of the related physical process inside the thermal compressor and builds a theoretical model for calculating the maximum entrainment ration. The results show that the present model can describe the ejection ability of the thermal compressor with satisfactory accuracy and application scope. Moreover, the results of the model calculation indicate that the ejection ability is enhanced with the increase of primary and suction steam pressure, but weakened by the increase of compressed steam pressure. The increase of primary steam pressure will promote the increase of entrainment ration while suction steam pressure does not affect the ejection ability.