Ternary-cycle cascade refrigeration natural gas liquefaction system and method thereof

A natural gas, cascading technology, applied in the direction of refrigeration and liquefaction, liquefaction, gas fuel, etc., can solve the problem that the construction cost of large-scale liquefaction plants cannot be effectively controlled, and achieve rich system adjustment methods, no heat transfer bottlenecks, procurement convenient effect

Active Publication Date: 2012-08-08
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, due to the monopoly of foreign natural gas liquefaction technology and key equipment, the

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  • Ternary-cycle cascade refrigeration natural gas liquefaction system and method thereof
  • Ternary-cycle cascade refrigeration natural gas liquefaction system and method thereof

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[0030] A three-cycle cascade refrigeration natural gas liquefaction system, such as figure 1As shown, including: propylene compressor 1, ethylene compressor 2, formula refrigerant compressor 3, high-pressure propylene evaporator 4, medium-pressure propylene evaporator 5, low-pressure propylene evaporator 6, low-pressure propylene evaporator 7, high-pressure ethylene Evaporator 8, medium pressure ethylene evaporator 9, low pressure ethylene evaporator 10, natural gas subcooler 11, propylene cooler 12, ethylene cooler 13, formula refrigerant cooler 14, propylene storage tank 15, ethylene storage tank 16, The first-stage J-T valve 17, the second-stage J-T valve 18, the third-stage J-T valve 19, the fourth-stage J-T valve 20, the fifth-stage J-T valve 21, the sixth-stage J-T valve 22, and the seventh-stage J-T valve 23, among which:

[0031] Propylene compressor 1, propylene cooler 12, propylene storage tank 15, primary J-T valve 17, high-pressure propylene evaporator 4, medium-pr...

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Abstract

The invention discloses a ternary-cycle cascade refrigeration natural gas liquefaction system and a method thereof. Heat is transferred from a relatively low temperature level cycle to an adjacent relatively high temperature level cycle: a first stage propylene refrigeration cycle provides cold energy for natural gas, refrigerant ethene, and formulated refrigerant; a second stage ethene refrigeration cycle provides cold energy for the natural gas and the formulated refrigerant; and a third stage formulated refrigerant refrigeration cycle provides cold energy for the natural gas and the formulated refrigerant itself. Through the cooling by seven heat exchangers and one plate-fin heat exchanger, temperature of the natural gas is reduced gradually till the natural gas is liquefied. In the invention, temperature of purified natural gas is reduced gradually in seven heat exchangers and one plate-fin heat exchanger till the purified natural gas is liquefied. The cold energy needed in a liquefaction process is provided by the three systems of propylene refrigerant, ethene refrigerant, and formulated refrigerant. The systems have abundant adjusting means, and can provide matching cold energy for the natural gas liquefaction process, thereby showing operation flexibility and adaptability to raw materials of the method.

Description

technical field [0001] The invention relates to a natural gas liquefaction process, in particular to a three-cycle cascade refrigeration natural gas liquefaction system and method. Background technique [0002] LNG is clean and environmentally friendly, and it has been rapidly promoted in many application fields such as urban gas, industrial fuel, urban gas peak shaving and accident emergency, gas vehicles, and high-end porcelain processing in areas without natural gas pipelines. However, due to the impact of international crude oil prices, the price of natural gas continues to rise, and the cost of raw materials for natural gas liquefaction plants continues to increase, resulting in a continuous decline in the profit margins of liquefaction plants. In recent years, natural gas liquefaction plants at home and abroad have developed towards large-scale and large-scale development. At present, the maximum liquefaction capacity of a single set has reached 7.8 million tons per ye...

Claims

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Application Information

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IPC IPC(8): F25J1/02C10L3/10
Inventor 刘家洪宋德琦孙林龙增兵蒲黎明宋光红汪宏伟郭成华陆永康胡益武陈运强冼祥发胡平郑颖黄勇琚宜林仲文旭田广新法玉晓刘红清
Owner BC P INC CHINA NAT PETROLEUM CORP
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