Characteristics of rotating speed of expander rotor in liquefied air energy storage system during load rejection

XU Guizhi; LIANG Lixiao; LU Chang; CUI Shuangshuang; BAI Ziwei; SONG Jie; DENG Zhanfeng; HE Qing

doi:10.19666/j.rlfd.202004117

English

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Characteristics of rotating speed of expander rotor in liquefied air energy storage system during load rejection

Thermal Power Generation Vol. 49, Issue 9, Pages: 72-79(2020)

更新时间：2025-09-28

- Characteristics of rotating speed of expander rotor in liquefied air energy storage system during load rejection
- 作者机构：
  
  1. 全球能源互联网研究院有限公司
  2. 华北电力大学能源动力与机械工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202004117
  CLC： TK02
- Published Online：15 August 2020，
  
  Published：2020
- 稿件说明：
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XU Guizhi, LIANG Lixiao, LU Chang, et al. Characteristics of rotating speed of expander rotor in liquefied air energy storage system during load rejection[J]. Thermal Power Generation, 2020, 49(9): 72-79.
DOI：

XU Guizhi, LIANG Lixiao, LU Chang, et al. Characteristics of rotating speed of expander rotor in liquefied air energy storage system during load rejection[J]. Thermal Power Generation, 2020, 49(9): 72-79. DOI： 10.19666/j.rlfd.202004117.

摘要

为了研究液化空气储能系统甩负荷时膨胀机转子的转速飞升问题

建立500 k W液化空气储能系统膨胀机组的动态模型

并对不同的调节阀关闭时间和转子时间常数时膨胀机组的甩负荷过程进行仿真计算和分析。结果表明:当阀门关闭时间为5 s、转子时间常数为15 s时

甩负荷过程中第1、2级膨胀机转速的超速比为142.2%

甩负荷过程用时为7 071 s

第3、4级转速的超速比为141.2%

用时为4 550 s;当阀门关闭时间缩短到0.5 s、转子时间常数减小到6 s时

甩负荷过程中第1、2级膨胀机转速的超速比降低至120.9%

甩负荷过程用时缩短至2 552 s

第3、4级转速的超速比为120.3%

用时缩短至2 200 s。因此

在液化空气储能系统甩负荷时

可以通过缩短调节阀的关闭时间来实现膨胀机转子最高转速在安全范围之内;同时

为了缩短甩负荷过程的持续时间

应适当减小转子的时间常数。

Abstract

To study the speed change of expander rotor during the load rejection of liquefied air energy storage(LAES) system

a dynamic model of expander unit of 500 kW LAES system is established. The load rejection process of the expander unit with different closing times of adjustment valve and time constants of rotor is simulated and analyzed. The results show that

when the closing time of adjustment valve is 5 s and the time constant of the rotor is 15 s

the over speed ratio of expander 1's speed to expander 2's speed is 142.2%

and the load rejection time is 7 071 s. The over speed ratio of expander 3's speed to expander 4's speed is 141.2%

and the load rejection time is 4 550 s during the load rejection. When the closing time of adjustment valve is shortened to 0.5 s and the time constant of the rotor is reduced to 6 s

the over speed ratio of expander 1's speed to expander 2's speed reduces to 120.9%

and the load rejection time shortens to 2 552 s. The over speed of expander 3's speed to expander 4's speed is 120.3%

and the load rejection time is 2 200 s during the load rejection. Thus

during the load rejection of the LAES system

shortening the closing time of adjustment valve can make the maximum speed of expander rotor within the safe range. Moreover

to shorten the time of load rejection

the time constant of the rotor should be appropriately reduced.

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