Oxygen-nitrogen separation system utilizing liquefied natural gas cold energy
A technology of liquefied natural gas and liquefied natural gas tanks, which is applied in the direction of cold treatment separation, liquefaction, refrigeration and liquefaction, etc., can solve the problem of no recycling of cryogenic parts, and achieve the effects of reduced system occupation, flexible adjustment, and reduced engineering investment
Pending Publication Date: 2018-07-10
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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[0023] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0024] as attached figure 1 As shown, the present invention provides an oxygen and nitrogen separation system utilizing the cold energy of liquefied natural gas, which system includes a liquefied natural gas tank, a liquefied natural gas cold energy recovery system, a liquid nitrogen tank, a pure nitrogen rectification tower, a pure oxygen rectification tower, Liquid oxygen tank, air purification system and waste nitrogen cold energy recovery system;
[0025] Liquefied natural gas LNG is output from the storage tank and pressurized to a specific pressure. The liquefied natural gas 1 enters the liquefied natural gas cold energy recovery system. In the liquefied natural gas cold energy recovery system, the liquefied natural gas is gasified, and the cold energy is transferred to the gaseous refrigerant 4. The gaseous state is changed into liquid refrigerant ...
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The invention discloses an oxygen-nitrogen separation system utilizing liquefied natural gas cold energy. The oxygen-nitrogen separation system comprises a liquefied natural gas tank, a liquefied natural gas cold energy recovery system, a liquid nitrogen tank, a pure nitrogen rectifying tower, a pure oxygen rectifying tower, a liquid oxygen tank, an air purification system and a waste nitrogen cold energy recovery system. After heat exchange of liquefied natural gas and a refrigerant of the liquefied natural gas cold energy recovery system, the liquefied natural gas is pressurized and conveyedoutside to be used by a user, and the natural gas cold energy recovery system and the pure nitrogen rectifying tower form a refrigerant circulation loop. The tower bottom and tower top of the pure nitrogen rectifying tower communicate with the tower bottom and tower top of the pure oxygen rectifying tower correspondingly to form a feed loop. The air purification system communicates with the wastenitrogen cold energy recovery system to form a sweeping gas loop. The waste nitrogen cold energy recovery system and the pure nitrogen rectifying tower form a waste nitrogen cold energy recovery loop. Through the oxygen-nitrogen separation system, the unit energy consumption of air separation gas products can be lowered by 20% or above.
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...
Claims
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Patent Timeline
Login to View More 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