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对于有蒸汽动力循环的工矿企业,可将热管换热器回收的工业余热用于热力循环系统,加热蒸汽回热循环中的凝结水,以排挤部分回热抽汽,使之继续在汽轮机中膨胀作功。但是,由于余热利用在热力系统中应用后要降低热力系统的回热效果,从而降低了系统的热经济性。本文着重分析讨论在以上两个因素的作用下,余热用于热系统后的经济性、热效率变化规律,以及如何充分利用余热使其作功最大,热系统循环热效率最高等问题。通过理论分析及实践验证,得到了蒸汽回热动力循环热效率的计算公式,以及余热并联输入系统要使余热利用有效益必须满足的条件,可供工程设计中参考。
For industrial and mining enterprises with steam power cycle, the industrial waste heat recovered by the heat pipe heat exchanger can be used in the heat cycle system to heat the condensate in the steam heat recovery cycle to displace part of the heat recovery steam so as to continue to expand in the steam turbine Work. However, the heat economy of the system is reduced because the utilization of residual heat in the thermal system reduces the heat recovery effect of the thermal system. This article focuses on the analysis of the above two factors under the effect of waste heat for the thermal system after the economy, thermal efficiency changes, and how to make full use of waste heat to make maximum work, the thermal system cycle thermal efficiency and other issues. Through the theoretical analysis and practical verification, the calculation formula of the thermal efficiency of the steam recirculation thermal cycle and the conditions that the waste heat parallel input system must meet in order to make the waste heat utilization effective can be obtained for engineering design reference.