Air separating system utilizing cold energy of liquefied natural gas
A technology of liquefied natural gas and liquefied natural gas tank, which is applied in the directions of cold treatment separation, liquefaction, refrigeration and liquefaction, etc., can solve the problem of no recycling and utilization of the cryogenic part, and achieve the effect of reducing system area, flexible adjustment, and reduced engineering investment.
Pending Publication Date: 2018-07-03
BEIJING PIONEER IND FURNACE
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Problems solved by technology
[0005] At present, the utilization rate of LNG cooling capacity by conventional air separation process technology using liquefied natural gas is less than 40%, only the shallow cooling part is used, and the more valuable cryogenic part is not recycled.
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[0024] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0025] as attached figure 1 As shown, the present invention provides an air separation system utilizing the cold energy of liquefied natural gas, the system comprising a liquefied natural gas tank, a liquefied natural gas cold energy recovery system, an argon tank, a crude argon rectification tower, a liquid nitrogen tank, and pure nitrogen rectification tower, pure oxygen rectification tower, liquid oxygen tank, air purification system and waste nitrogen cold energy recovery system;
[0026] The liquefied natural gas 1 is output from the storage tank and enters the LNG cold energy recovery system. In the LNG cold energy recovery system, the liquefied natural gas is vaporized, and the cold energy is transferred to the gaseous refrigerant 4. The gaseous refrigerant 4 changes from a gaseous state to a liquid state 3. After exchanging heat with the refrigera...
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The invention discloses an air separating system utilizing cold energy of liquefied natural gas. The system comprises a liquefied natural gas tank, a liquefied natural gas cold energy recycling system, a raw argon rectifying tower, a pure nitrogen rectifying tower, a pure oxygen rectifying tower, an air purifying system and a waste nitrogen cold energy recycling system. After the liquefied naturalgas conduct heat exchange with the liquefied natural gas cold energy recycling system, the liquefied natural gas is pressurized and output to be used by a user, a refrigerant circulation loop is formed by the liquefied natural gas cold energy recycling system and the pure nitrogen rectifying tower, and the tower bottom and the tower top of the pure nitrogen rectifying tower communicate with the tower bottom and the tower top of the pure oxygen rectifying tower correspondingly to form feeding loops. An argon purifying and liquid oxygen cooling loop is formed between the raw argon rectifying tower and the pure nitrogen rectifying tower. The air purifying system communicates with the waste nitrogen cold energy recycling system to form a sweeping gas loop. A waste nitrogen cold energy recycling loop is formed by the waste nitrogen cold energy recycling system, the pure oxygen rectifying tower and the raw argon rectifying tower. By means of the air separating system, the unit energy consumption of an air separation gas product is reduced by 20% or higher.
Description
technical field [0001] The invention relates to an air separation system, in particular to a system for separating oxygen and nitrogen in air by using the cold energy of liquefied natural gas. Background technique [0002] Air separation is the separation, purification and storage of oxygen and nitrogen in the air for subsequent industrial applications. The main components in the air are oxygen and nitrogen, which have different boiling points; the air separation process first compresses, pre-cools, purifies, and further cools the air to minus 100 degrees Celsius to make it into liquid air, and then uses oxygen to The difference between the boiling point of nitrogen and nitrogen, the liquid air is evaporated and condensed multiple times through the rectification tower, so that oxygen and nitrogen are separated, and purified liquid oxygen and liquid nitrogen products are obtained. [0003] The air separation system needs a lot of low-temperature cold energy. Conventional liq...
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IPC IPC(8): F25J3/04
CPCF25J3/04636F25J3/04787F25J2210/40
Inventor 郝兆龙曹建喜杨彩玲周海波
Owner BEIJING PIONEER IND FURNACE