螺杆膨胀机有机朗肯循环系统的变工况特性

摘要/Abstract

摘要：

针对螺杆膨胀机的工作特点，建立了其简化热力计算模型及示功图.以R123制冷剂为工质，采用螺杆膨胀机有机朗肯循环系统进行华北油田中低温采油伴生热液的利用发电，筛选了变工况下影响系统性能的主要因素，通过迭代求解系统的稳态参数，并对比了净功率、热效率及火用损失.结果表明：过热蒸汽有利于提高单位工质的输出功率，但会引起系统的净功率下降；冷却水进口温度对系统的影响最大，夏季温度较高，将会使得系统的输出功率严重偏离额定功率，保证冷凝器的冷凝效果是改善系统性能的有效措施；热源温度对系统输出功率的影响大于热源流量的影响.

关键词: 螺杆膨胀机, 变工况, 有机朗肯循环, 中低温, 余热回收

Abstract:

Simplified models for thermodynamic calculation and indicator diagrams were established based on the operating feature of screw expander．A screw expander system based on organic Rankine cycle (ORC) using R123 as working medium was applied to power generation with associated hot fluid during oil recovery in Huabei Oil Field. After screening main factors, systematic characteristics under variable conditions were attained, by solving new steady state using iteration, analyzing net power, thermal efficiency and energy destructions. The result shows that superheated vapor leads to the decline of output network, although it benefits the output power per unit working medium. The temperature of inlet cooling water affects system performance most and the higher temperature in hot summer results in great deviation of systematic output from design condition. Ensuring the cooling capacity is an effective way to improve the performance. The influence of the change of heat source temperature is larger than that of mass flow．

Key words: screw expander, variable working conditions, organic Rankine cycle (ORC), medium and low temperature, recovery of waste heat

中图分类号:

TK 11

梁任1，余岳峰1，陈亮乐2，邓志强2，黄云2. 螺杆膨胀机有机朗肯循环系统的变工况特性[J]. 上海交通大学学报（自然版）, 2014, 48(09): 1291-1296.

LIANG Ren1,YU Yuefeng1,CHEN Liangle2,DENG Zhiqiang2,HUANG Yun2. Characteristics of Variable Conditions of Screw Expander System Based on Organic Rankine Cycle[J]. Journal of Shanghai Jiaotong University, 2014, 48(09): 1291-1296.

参考文献

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