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Cooling circulating system, natural gas liquefaction device, operation method and improvement method of cooling circulating system

A circulation system and operation method technology, applied in refrigeration and liquefaction, irreversible cycle compressors, liquefaction, etc., can solve the problems of time-consuming discharge pressure of refrigerant compressors, reduced efficiency of driving sources, and increased equipment costs.

Inactive Publication Date: 2009-06-03
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Including the technology described in Patent Document 1 above, the method of throttling the suction flow rate of the compressor at start-up can reduce the volumetric flow rate of suction air, but the refrigerant temperature and even the saturation pressure at start-up are different from those without air intake control. The same is true for the throttling of the flow rate, so reducing the mass flow rate of the suction air to reduce the torque required for starting has a limited effect
[0004] In addition, the method of pre-installing a driving source with a large capacity may reduce the efficiency of the driving source during rated operation, and the equipment cost may also increase.
[0005] The method of discharging the refrigerant discharged from the refrigerant compressor to the outside at startup can avoid the pressure fluctuation of the refrigerant compressor and reduce the starting torque, but it is expensive to increase the discharge pressure of the refrigerant compressor. There is a tendency that the time required until the end of the start of the cooling cycle is prolonged
Also, wasting refrigerant is a disadvantage

Method used

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  • Cooling circulating system, natural gas liquefaction device, operation method and improvement method of cooling circulating system
  • Cooling circulating system, natural gas liquefaction device, operation method and improvement method of cooling circulating system
  • Cooling circulating system, natural gas liquefaction device, operation method and improvement method of cooling circulating system

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no. 1 approach

[0028] (structure)

[0029] figure 1 It is an overall configuration diagram of a natural gas liquefaction facility using the cooling cycle system according to the first embodiment of the present invention.

[0030] The main structural elements of the natural gas liquefaction plant shown in the figure include: the main heat exchanger 21 for cooling and liquefying the natural gas (gas state) introduced from the natural gas introduction pipeline 20; The first refrigerant") cools the natural gas refrigerant (hereinafter referred to as "second refrigerant") to the first cooling cycle system 61; and the second refrigerant cooled by the first cooling cycle system 61 is sent to the main The heat exchanger 21 supplies the second cooling circulation system 60 . The characteristic structure is that the first cooling cycle system 61 has an auxiliary cooling mechanism 62 for cooling the first refrigerant using a refrigerant as a working medium (hereinafter referred to as “auxiliary refri...

no. 2 approach

[0089] (structure)

[0090] Figure 7 It is an overall configuration diagram of a natural gas liquefaction facility using a cooling cycle system according to a second embodiment of the present invention.

[0091] This embodiment is the same as the first embodiment and relates to natural gas liquefaction equipment with a cooling cycle system. Since the structure of the first cooling cycle system 61, the second cooling cycle system 60, and the main heat exchanger 21 are the same as those of the first embodiment, except Except for a part of the first cooling circulation system 61 , illustration is omitted. For the first cooling cycle system 61 , only the refrigerant compressor 1 , the condenser 10 , the accumulator 11 , the expansion mechanism 18 , and the evaporation mechanism 19 are briefly shown. In the present embodiment, the compressors of the first cooling cycle system 61 and the cooling cycle 60 are also driven by electric motors, and the natural gas liquefaction facilit...

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Abstract

The invention provides a cooling circulating system (61). The cooling circulating system (61) is equipped with a refrigerant compressor (1) for compressing a refrigerant, a condenser (10) for cooling and condensing the refrigerant which is compressed by the refrigerant compressor (1), a reservoir (11) for accommodating the refrigerant which is condensed by the condenser (10), dilation mechanism (18) for dilating the refrigerant from the reservoir (11), an evaporation mechanism (19) for cooling an object to be cooled by heat exchange with the refrigerant which is dilated by the dilation mechanism (18) and vaporizing the refrigerant which is provided by the refrigerant compressor (1), and an auxiliary cooling mechanism (62) which is equipped with a line (47) for an auxiliary refrigerant to flow in and run through the reservoir (11) and cools the refrigerant in the reservoir (11) by the heat exchange with the refrigerant which flow in the line (47) before the refrigerant compressor (1) is started. Therefore, the power for starting the refrigerant compressor can be reduced, and the refrigerant compressor can be stably started by a drive source with a small torque.

Description

technical field [0001] The invention relates to a cooling circulation system, a natural gas liquefaction equipment, an operation method and a transformation method of the cooling circulation system. Background technique [0002] In order to turn gaseous natural gas into liquefied natural gas suitable for transportation, it is necessary to cool the natural gas to a low temperature of about -150°C in a pressurized state and then expand it to near the external pressure. This cooling is realized by combining a plurality of cooling cycles such as propane and a mixed refrigerant. When starting these cooling cycles, since the temperature and pressure of the refrigerant in the process are different from those during rated operation, the torque required for starting the refrigerant compressor (hereinafter referred to as starting torque) is lower than that during rated operation. is large, indicating that the refrigerant compressor may not be able to be started depending on the torqu...

Claims

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Application Information

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IPC IPC(8): F25B1/00C10L3/06F25J1/00
CPCF25J1/0268F25J1/0215F25J1/0284F25J1/0218F25J1/0212F25J2270/906F25J1/0279F25J2270/12F25J1/0052F25J1/0216F25J2270/60F25J2290/34F25J2270/90F25J1/0244F25J2280/10F25J1/0055F25J1/0087F25J2240/82F25J1/0211F25J2270/18F25J2240/80F25J1/0242F25J1/0298F25J1/0022F25J2260/02F25J1/0236F25J1/0247
Inventor 荒木秀文坂内正明福岛康雄堀次睦
Owner HITACHI LTD