Optimization in the Control Modes for Propane Compressor in C3/MRC Liquefaction Process

Abstract

Abstract:

The flexibility of three reflux modes including overall reflux, gradual reflux and last stage reflux for propane compressor in C3/MRC liquefaction process is simulated respectively by dynamic simulation, on which basis high pressure control and low pressure control are added, respectively. In this way, the influence on liquefaction process and the response speed of the controller by changing the settings of controller can be analyzed. It is indicated that the high pressure control of gradual reflux can meet the demand of better stability and faster response in liquefaction process.

Key words: liquefaction process, C3/MRC, compressor, control mode, dynamic simulation

CLC Number:

TB657.8

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Hong-yu PAN, Shun-li LI, Yu-xing LI, Jian-lu ZHU. Optimization in the Control Modes for Propane Compressor in C3/MRC Liquefaction Process[J]. Ocean Engineering Equipment and Technology, 2015, 2(3): 157-162.

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URL: https://www.qk.sjtu.edu.cn/oeet/EN/

https://www.qk.sjtu.edu.cn/oeet/EN/Y2015/V2/I3/157

Figures/Tables 8

Fig.1

Flow chart of the overall reflux mode for propane compressor

Fig.1

Fig.2

Response for overall reflux

Fig.2

Fig.3

Flow chart of the gradual reflux mode for propane compressor

Fig.3

Fig.4

Failure of low pressure control for propane compressor

Fig.4

Fig.5

Response for the change of sp in gradual reflux pressure control

Fig.5

Fig.6

Flow chart of the 3rd stage reflux mode for propane compressor

Fig.6

Fig.7

Response for the change of sp in the 3rd stage reflux pressure control

Fig.7

Table 1

Comparison of reflux modes and control modes for propane compressor

控制方式			余差 /kPa	最大偏差/kPa	调节时间/min
大回流	高压控制		0	3	19.17
大回流	低压控制		0	3.1	123.33
逐级回流	高压控制	第三级	0	5	256.67
		第二级	0	2	60
		第一级	0	1.8	23.3
	低压控制	第三级	0	5	40
		第二级	0	3.17	173.33
		第一级	—	2.75	—
末级回流 (三级出口回流)	高压控制	第三级	—	—	—
		第二级	—	—	—
		第一级	—	—	—
	低压控制	第三级	0	3.74	66.67
		第二级	0	5	48.33
		第一级	—	5.7	—

Table 1

References 5

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[2]	van de Graaf J M, Pek B. The shell PMR process for large capacity LNG trains[C]. AICHE Spring Meeting, 2005.
[3]	Martin P Y, Pigourier J, Fischer B.LNG process selection no easy task[J], Hydrocarbon Engineering, 2004, 9(5): 75.
[4]	徐文渊. 小型液化天然气生产装置[J]. 石油与天然气化工, 2005, 34(3): 161. doi: 10.3969/j.issn.1007-3426.2005.03.004 URL
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