Influence of intake pressure on the performance of single screw expander working with compressed air

He, Wei; Wu, Yuting; Peng, Yanhai; Zhang, Yeqiang; Ma, Chongfang; Ma, Guoyuan

doi:10.1016/j.applthermaleng.2012.10.013

Cited by 76 publications

(34 citation statements)

References 6 publications

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“…Any failure in the pressure power generation can be readily cut off, while the original natural gas pressure system continues to run. Single-screw expanders with 117 and 175 mm diameter screw have been developed by our team [34,36]. On the basis of our performance experiments on these single-screw expanders, a single-screw expander with a 195 mm diameter screw was developed last year; the in volume ratio of this expander is 4.5.…”

Section: Introductionmentioning

confidence: 99%

Performance Study on a Single-Screw Expander for a Small-Scale Pressure Recovery System

Zhang

et al. 2016

Energies

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Abstract:A single-screw expander with 195 mm diameter is developed to recover pressure energy in letdown stations. An experiment system is established using compressed air as a working fluid instead of natural gas. Experiments are conducted via measurements for important parameters, such as inlet and outlet temperature and pressure, volume flow rate and power output. The influence of inlet pressure and rotational speed on the performance are also analyzed. Results indicate that the single-screw expander achieved good output characteristics, in which 2800 rpm is considered the best working speed. The maximum volumetric efficiency, isentropic efficiency, overall efficiency, and the lowest air-consumption are 51.1 kW, 83.5%, 66.4%, 62.2%, and 44.1 kg/(kW·h), respectively. If a single-screw expander is adopted in a pressure energy recovery system applied in a certain domestic natural gas letdown station, the isentropic efficiency of the single-screw expander and overall efficiency of the system are found to be 66.4% and 62.2%, respectively. Then the system performances are predicted, in which the lowest methane consumption is 27.3 kg/(kW·h). The installed capacity is estimated as 204.7 kW, and the annual power generation is 43.3 MWh. In the next stage, a pressure energy recovery demonstration project that recycles natural gas will be established within China, with the single-screw expander serving as the power machine.

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Section: Introductionmentioning

confidence: 99%

Performance Study on a Single-Screw Expander for a Small-Scale Pressure Recovery System

Zhang

et al. 2016

Energies

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“…The suction slide valve makes the SSE run at a fixed speed and the volume ratio slide valve prevents it from under-expansion and over-expansion, and thus the SSE can work at a better efficiency point. After adding both the suction slide valve and the volume ratio slide valves for a SSE, the power output and the net power output increases linearly with the growth of waste heat availability, as can be seen from the power output and net power output equation, i.e., Equations (11) and (24). Therefore, the power output of SSE and the net power output Now, SV represents the slide valve in the following figures.…”

Section: Resultsmentioning

confidence: 99%

“…In the medium-low power range, the displacement expander is a better choice than the turbo generator, because the former has a low flow rate, low rotational speed and a high pressure ratio [29]. In the development of expander technologies for small-scale ORC units, the single-screw expander (SSE) has gained popularity because of its superior characteristics of balanced loads, small noise, long life service, little vibration, and simple structure [21][22][23][24][25][26][27]. SSE is a good choice for power generating ORC units ranging from 1 kW to 1000 kW.…”

Section: Introductionmentioning

confidence: 99%

“…Based on comparison between the performance of prototypes with different gate rotor/shell and screw/shell gaps, they concluded that the prototype with a medium gate rotors/shell gap of 0.04 mm and a screw/shell 0.05 mm gap demonstrates the best overall performance, with an expander shaft efficiency of 60%. He et al [24] investigated the influence of intake pressure on the performance of a self-developed SSE with a 175 mm diameter rotor. Aside from obtaining the performance parameters of the SSE from a test, they discovered a negative effect of high backing pressure values on the power output.…”

Section: Introductionmentioning

confidence: 99%

“…Expanders come in two types: dynamic (turbine) [8,9] and positive displacement (volumetric) [10] such as rotary vane [11][12][13][14], scroll [15][16][17][18][19], twin screw [20], single-screw [21][22][23][24][25][26][27] and reciprocating expanders [28]. In the medium-low power range, the displacement expander is a better choice than the turbo generator, because the former has a low flow rate, low rotational speed and a high pressure ratio [29].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Slide Valves for Single-Screw Expanders Working Under Varied Operating Conditions

Zhi

Lei

et al. 2016

Energies

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This paper fully describes the working principle of slide valves in single-screw expanders (SSEs). A geometric analysis of suction and volume ratio slide valves is presented to determine the relations between volume ratio, suction closure volume, discharge opening volume and slide valves displacement. An organic Rankine cycle (ORC) thermodynamic model with SSE integrated with slide valves is developed to analyze the power output of SSE and the net power output of ORC system and variation law of slide valves displacement. Analysis of a typical ORC system under changing operating conditions shows that the power output of the expander and the net output power of the ORC system with slide valves are much better than those without slide valves. When the condensing temperature is 40˝C and the waste availability is 80 kW, the increase in output power and net output power are approximately 3.4 kW and 5 kW, respectively. The presented geometric analysis of slide valves and the thermodynamic model integrated with slide valves can be used to provide a theoretical and technical basis for designing the slide valves of SSEs and the control strategies of slide valves under varied operating conditions.

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Organic Rankine Cycles Including Fluid Selection

Lemort

Declaye

Quoilin

2015

Handbook of Clean Energy Systems

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The Handbook of Clean Energy Systems brings together an international team of experts to present a comprehensive overview of the latest research, developments and practical applications throughout all areas of clean energy systems. Consolidating information which is currently scattered across a wide variety of literature sources, the handbook covers a broad range of topics in this interdisciplinary research field including both fossil and renewable energy systems. The development of intelligent energy systems for efficient energy processes and mitigation technologies for the reduction of environmental pollutants is explored in depth, and environmental, social and economic impacts are also addressed.

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Influence of intake pressure on the performance of single screw expander working with compressed air

Cited by 76 publications

References 6 publications

Performance Study on a Single-Screw Expander for a Small-Scale Pressure Recovery System

Performance Study on a Single-Screw Expander for a Small-Scale Pressure Recovery System

Slide Valves for Single-Screw Expanders Working Under Varied Operating Conditions

Organic Rankine Cycles Including Fluid Selection

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