System and method for liquefying natural gas through multi-component refrigerant cycle refrigeration

A liquefied natural gas and refrigerant circulation technology, applied in the field of natural gas liquefaction, can solve the problems of high operation and maintenance requirements, high cost, large system area, etc., and achieve the effect of compact structure, high speed and small area.

Active Publication Date: 2015-07-15
SICHUAN HENGRI GAS ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned natural gas liquefaction system has high sectional refrigeration efficiency, which is conducive to the localization of key equipment and the large-scale liquefaction plant. However, the above-mentioned system occupies a large area, requires high operation and maintenance requirements, and is expensive

Method used

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  • System and method for liquefying natural gas through multi-component refrigerant cycle refrigeration
  • System and method for liquefying natural gas through multi-component refrigerant cycle refrigeration
  • System and method for liquefying natural gas through multi-component refrigerant cycle refrigeration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] use as figure 1 The shown multi-component refrigerant cycle refrigeration system for liquefied natural gas, the multi-component refrigerant is composed of 10wt% nitrogen, 23wt% methane, 35wt% ethylene, 15wt% propane and 17wt% isopentane, and the raw natural gas does not contain heavy hydrocarbons , and the processing capacity is 5×10 4 N m 3 / d.

[0083] The multi-component refrigerant is pressurized through the oil-injected screw compressor to obtain a multi-component refrigerant containing oil after pressurization, the pressure reaches 3.2MPa, and the temperature is 115°C; among them, the oil-injected screw compressor is lubricated with micro-oil , the amount of oil entering the compressor is 1.7L / min, the inlet pressure of the compressor is 0.2MPa, the outlet pressure is 3.2MPa, the inlet temperature is 10°C-45°C, and the outlet temperature is 115°C; the cycle of multi-component refrigerant The flow rate is 5200Nm 3 / h;

[0084] The pressurized oil-containing mu...

Embodiment 2

[0091] use as figure 2 The shown multi-component refrigerant cycle refrigeration system for liquefied natural gas, the multi-component refrigerant is composed of 10wt% nitrogen, 25wt% methane, 37wt% ethylene, 13wt% propane and 15wt% isopentane, and the raw natural gas contains a small amount of heavy hydrocarbons (C 6+ wt%: 0.02~0.09), and the processing capacity is 5×10 4 N m 3 / d.

[0092] The multi-component refrigerant is pressurized through an oil-injected screw compressor to obtain a multi-component refrigerant containing oil after pressurization, with a pressure of 3.5 MPa and a temperature of 120°C; among them, the oil-injected screw compressor is lubricated with minimal oil , the amount of oil entering the compressor is 1.7L / min, the inlet pressure of the compressor is 0.2MPa, the outlet pressure is 3.5MPa, the inlet temperature is 10°C-45°C, and the outlet temperature is 120°C; the cycle of multi-component refrigerant The flow rate is 5200Nm 3 / h;

[0093] The...

Embodiment 3

[0100] use as image 3 The shown multi-component refrigerant circulation refrigeration system for liquefied natural gas, multi-component refrigerant is composed of 10wt% nitrogen, 23wt% methane, 35wt% ethylene, 15wt% propane and 17wt% isopentane, raw natural gas contains variable weight Hydrocarbons, and the processing capacity is 5×10 4 N m 3 / d.

[0101] The multi-component refrigerant is pressurized through the oil-injected screw compressor to obtain a multi-component refrigerant containing oil after pressurization, the pressure reaches 3.2MPa, and the temperature is 115°C; among them, the oil-injected screw compressor is lubricated with micro-oil , the amount of oil entering the compressor is 1.7L / min, the inlet pressure of the compressor is 0.2MPa, the outlet pressure is 3.2MPa, the inlet temperature is 10°C-45°C, and the outlet temperature is 115°C; the cycle of multi-component refrigerant The flow rate is 5200Nm 3 / h;

[0102] The pressurized oil-containing multi-c...

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Abstract

The invention provides a system and method for liquefying natural gas through multi-component refrigerant cycle refrigeration. The system comprises an oil-injected screw compressor, a lubricating oil separating device, a lubricating oil filtering device, a refrigerant cooling device, a refrigerant separating device and a heat exchange device, wherein the oil-injected screw compressor, the lubricating oil separating device, the lubricating oil filtering device, the refrigerant cooling device, the refrigerant separating device and the heat exchange device are connected in sequence through pipelines; the oil-injected screw compressor is used for supercharging multi-component refrigerants, the lubricating oil separating device and the lubricating oil filtering device are used for oil removal of the supercharged oil-bearing multi-component refrigerants, the refrigerant cooling device is used for cooling the multi-component refrigerants obtained after oil removal, the refrigerant separating device is used for extracting gas phase refrigerants and liquid phase refrigerants from the cooled multi-component refrigerants, and the heat exchange device is used for heat exchange of mixed liquid multi-component refrigerants and raw natural gas to liquefy raw natural gas. The system and method for liquefying natural gas have the advantages of saving the floor area, being stable in performance, convenient to operate and maintain, low in running cost and investment cost, and the like.

Description

technical field [0001] The application belongs to the technical field of natural gas liquefaction, and in particular relates to a system and method for refrigerating liquefied natural gas with multi-component refrigerant circulation. Background technique [0002] The main component of natural gas, coalbed methane, and shale gas is methane. Methane at normal pressure becomes liquid methane (which can be called liquefied natural gas, or LNG) when the temperature is lower than -161.5°C. Liquefaction by pressurization requires the use of natural gas liquefaction process. The volume of liquefied natural gas is only 1 / 625 of the original gas state, the density is more than 600 times that of methane in the standard state, 42.5% of water, and the volumetric energy density is 75% of gasoline. Because of its clean burning quality, ease of use, and ease of transportation and storage, LNG is now a high-quality industrial and domestic fuel. [0003] The natural gas liquefaction refrige...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J1/02
Inventor 林辉何毅严丽君王清海
Owner SICHUAN HENGRI GAS ENG CO LTD
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