Study on matching characteristics of centrifugal vapor compressor and evaporator in MVR system

doi:10.3785/j.issn.1006-754X.2022.00.071

Chin J Eng Design

2022, Vol. 29

Issue (5): 595-606 DOI: 10.3785/j.issn.1006-754X.2022.00.071

Modeling, Simulation, Analysis and Decision

Study on matching characteristics of centrifugal vapor compressor and evaporator in MVR system

Dong ZHOU^1,²(

),Xin WEN^1,³,Jing WANG^2,³,Tao XIONG¹,Dong-ting SUN¹,Guang-ju DAN¹,Yang LIU²

^1.Chongqing Jiangjin Shipbuilding Heavy Industry Co. , Ltd. , Chongqing 402263, China
^2.National Engineering Research Center of Special Equipment and Power System for Ship and Marine Engineering, Shanghai 201108, China
^3.Key Laboratory of Marine Turbocharger Research and Development, Chongqing Industry and Information Technology, Chongqing 402263, China

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Abstract

In order to ensure the operation economy and stability of mechanical vapor recompression (MVR) system, the matching characteristics of centrifugal vapor compressor and evaporator in the MVR system were studied. In view of the change of heat transfer coefficient of evaporator under new operation, operation and scaling conditions, the concept of temperature resistance characteristic curve of evaporator operation was put forward, and it was superposed with the temperature rise characteristic curve of centrifugal vapor compressor, so as to carry out matching analysis of centrifugal vapor compressor and evaporator. Through analysis, it was found that the design flow of centrifugal vapor compressor was too large or the heat transfer area of evaporator was too small, which would lead to insufficient matching and easy surge, thus affecting the operation stability of MVR system. However, the design flow of centrifugal vapor compressor was too small or the heat transfer area of evaporator was too large, which led to excessive matching, resulting in poor operating economy of the MVR system, and may even cause the MVR system to be unable to establish thermal self cycle. The results showed that the centrifugal vapor compressor had unstable surge during the startup of MVR system, and the unstable area could be avoided by temporary adjustment of system parameters or by taking auxiliary measures. The surge margin of centrifugal vapor compressor should be more than 20% and the design margin of heat transfer area of evaporator should be 30% during design; the deviation between actual evaporation temperature and design temperature during MVR system operation should be controlled within ±5 ℃. The research results can provide reference for the design and debugging of MVR system.

Key words： mechanical vapor recompression centrifugal vapor compressor evaporator matching surge

Received: 20 January 2022 Published: 02 November 2022

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	Dong ZHOU
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	Guang-ju DAN
	Yang LIU

Cite this article:

Dong ZHOU,Xin WEN,Jing WANG,Tao XIONG,Dong-ting SUN,Guang-ju DAN,Yang LIU. Study on matching characteristics of centrifugal vapor compressor and evaporator in MVR system. Chin J Eng Design, 2022, 29(5): 595-606.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2022.00.071 OR https://www.zjujournals.com/gcsjxb/Y2022/V29/I5/595

MVR系统中离心式蒸汽压缩机与蒸发器的匹配特性研究

为了保证机械式蒸汽再压缩（mechanical vapor recompression， MVR）系统的运行经济性和稳定性，对MVR系统中离心式蒸汽压缩机与蒸发器的匹配特性进行研究。针对蒸发器换热系数在新投、工作和结垢工况下的变化，提出了蒸发器运行温阻特性线的概念，并将其与离心式蒸汽压缩机的温升特性线叠加，从而开展离心式蒸汽压缩机与蒸发器的匹配分析。通过分析发现，离心式蒸汽压缩机的设计流量偏大或蒸发器的换热面积过小会导致匹配不足，易发生喘振，从而影响MVR系统的运行稳定性。而离心式蒸汽压缩机的设计流量偏小或蒸发器的换热面积过大会导致匹配过度，致使MVR系统的运行经济性差，甚至可能造成MVR系统无法建立热力自循环。结果表明，离心式蒸汽压缩机在MVR系统启动过程中会出现不稳定的喘振现象，可以通过系统参数的临时调节或采取辅助措施来避开不稳定区。设计时应保证离心式蒸汽压缩机的喘振裕度大于20%，蒸发器换热面积的设计裕度为30%；MVR系统运行时实际蒸发温度与设计温度的偏差应控制在±5 ℃以内。研究结果可为MVR系统的设计和调试提供参考。

关键词： 机械式蒸汽再压缩, 离心式蒸汽压缩机, 蒸发器, 匹配, 喘振

Fig.1 Schematic of main equipment composition of MVR system

Fig.2 Schematic of thermal process of MVR system

Table 1 Main design parameters of MVR system

Table 2 Main design parameters of centrifugal vapor compressor

Fig.3 Schematic of material balance and heat balance of evaporator

Table 3 Main design parameters of evaporator

Fig.4 Temperature rise characteristic curves of centrifugal vapor compressor

Fig.5 Characteristic curves of evaporator

Fig.6 Characteristic matching of centrifugal vapor compressor and evaporator at speed of N_c2

Fig.7 Characteristic matching of centrifugal vapor compressor and evaporator in MVR system (T_e=80 °C，S=177 m²)

Fig.8 Matching operation range of centrifugal vapor compressor in MVR system (T_e=80 °C，S=177 m²)

Fig.9 Matching operation range of evaporator in MVR system (T_e=80 °C，S=177 m²)

Fig.10 Operation site of MVR system

Table 4 Operating parameters of centrifugal vapor compressor with rated evaporation capacity

Fig.11 Change of operating point of centrifugal vapor compressor (T_e=80 °C，S=177 m²)

Table 5 Heat transfer area of evaporator under different matching conditions

Fig.12 Matching of centrifugal vapor compressor and evaporator with heat transfer area of 120 m² (T_e=80 °C)

Fig.13 Matching of centrifugal vapor compressor and evaporator with heat transfer area of 289 m² (T_e=80 °C)

Fig.14 Matching of centrifugal vapor compressor and evaporator with heat transfer area of 235 m²(T_e=80 °C)

Fig.15 Matching of centrifugal vapor compressor and evaporator with actual evaporation temperature of 90 °C^{(S=177 m²)}

Fig.16 Matching of centrifugal vapor compressor and evaporator with actual evaporation temperature of 70 °C (S=177 m²)

Table 6 Comparison of evaporator quality and pneumatic power of centrifugal vapor compressor under different heat transfer areas

Fig.17 Characteristic line of temperature rise‒pneumatic power of centrifugal vapor compressor


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