Research and Development of Steam Twin Screw Expander

doi:10.7652/xjtuxb201403001

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Research and Development of Steam Twin Screw Expander

更新时间：2025-04-29

- Research and Development of Steam Twin Screw Expander
- Vol. 48, Issue 3, Pages: 1-5+16(2014)
- 作者机构：
  
  西安交通大学压缩机工程系,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201403001
  CLC： TB653
- Online First：10 March 2014，
  
  Published：2014
- 稿件说明：
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Research and Development of Steam Twin Screw Expander[J]. 2014, 48(3): 1-5+16.
DOI：

Research and Development of Steam Twin Screw Expander[J]. 2014, 48(3): 1-5+16. DOI： 10.7652/xjtuxb201403001.

摘要

针对双螺杆水蒸气膨胀机的工作过程进行了理论研究

结果表明

在欠、过膨胀工作过程中回收功减少

且当压差相等时欠膨胀引起的做功能力下降幅度较小。通过研究内容积比、进口蒸汽热力参数和欠、过膨胀对双螺杆水蒸气膨胀机回收功和容积流量影响时发现:内容积比存在最优值

其可使膨胀机回收功最大; 欠膨胀会导致膨胀功下降

膨胀机的容积流量减少。由此

提出了双螺杆膨胀机的经济性设计思路:在大中型双螺杆膨胀机的设计时宜采用欠膨胀工况

使膨胀终了压力接近且略大于出口背压

相应的内容积比小于最优内容积比。采用该思路进行设计

不仅可以得到较好的回收功

而且可使得膨胀机容积流量减少、经济性提高

为指导双螺杆膨胀机的设计提供借鉴。

Abstract

The expansion working process of a steam twin screw expander was theoretically studied. The influences of internal volume ratio

thermal parameters of inlet steam

under-and over-expansion on the recovery work of the steam screw expander were investigated. The effects of the deviation between the optimum internal volume ratio and the actual internal volume ratio on the recovery work and volume flow of the steam screw expander were analyzed. The results show that under-expansion and over-expansion can lead to the decrease in recovery work of the steam twin screw expander compared with full expansion. The decrement of recovered power by under-expansion is less than that by over-expansion when the pressure difference between the internal pressure of end expansion and discharge pressure is the same. There is an optimum internal volume ratio matching the maximum recovery work at certain thermal parameters of inlet steam. It is suggested that large scale twin screw expanders should be designed according to the under-expansion condition because under-expansion will cause small drop in the recovery work and significant decrease in the volume flow ratio.

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references

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