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Heat and pressure utilization project is China one of the key energy saving projects. Currently in our industry there are a lot of small-scale waste heat resources, the lack of effective technical means have not been fully utilized, resulting in an overall energy efficiency is low. Therefore, the development of new and efficient low-temperature waste heat power generation system for the improvement of energy efficiency, waste heat utilization technology to improve the country's situation with the lack of significance. The issue of resources according to the characteristics of low-temperature waste heat is proposed using a single screw expander and an organic Rankine cycle combined heat power generation system to solve the problem of efficient use of resources. This article first designed and built a single-screw expander basic performance test bench, with compressed air as a power source for a single screw expander basic performance tests conducted research, has been single-screw expander full load curve, different valve opening degrees and the humidity and the performance curve backpressure on the expander performance curve. The results showed that: a single-screw expander smooth running, low noise, power output characteristics of a good process, the temperature drop significantly, the maximum output power expander up to 5kW, temperature drop of up to 63 ℃; prototype efficiency is not very ideal expander, there are still many imperfections, especially mechanical loss is too large. Wherein the mechanical efficiency up to 95% isentropic efficiency of up to 59%, the overall efficiency can be up to 35%. Comprehensive view, the prototype basically reached the preliminary design requirements, but also there is considerable room for improvement. In addition, this paper to 400 ℃ flue gas to heat the organic Rankine cycle system, the main parameters to determine the system proposed method, the two kinds of refrigerants R134a and R245fa, were calculated using Matlab. Compared two heat the working fluid in this condition as well as the merits of superheat of organic Rankine cycle system. Through the flue gas as a heat source in an organic Rankine cycle system calculations show that for R134a and R245fa two kinds of working fluid, overheat thermal system for increasing the output power is not much sense. Comprehensive comparison of view, R134a at both the low performance better than R245fa, while the high temperature section R245fa better performance. Finally, still on the expander basic performance test basis, designed and built a single-screw expander Organic Rankine cycle power generation system. Meanwhile, innovative design and analysis of single screw expander Organic Rankine cycle power generation system at low temperature waste heat power recovery aspects of the application cases, as in the field of low-temperature waste heat utilization opened up ideas.
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