Nitrogen self-pressurization air separation device

An air separation unit and self-pressurization technology, which is applied in the direction of cold treatment separation, liquefaction, solidification, etc., can solve the problems of investment cost and operation cost increase, and achieve the effect of saving one-time investment, improving distillation efficiency and high profit

Pending Publication Date: 2020-07-24
苏州制氧机股份有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0002] Air separation equipment is widely used in the fields of petroleum, chemical industry, building materials, metallurgy and environmental protection; in the air separation process of conventional molecular sieve purification and supercharged turbo expander refrigeration, in order to obtain the pressure of the corresponding nitrogen

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  • Nitrogen self-pressurization air separation device

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, technical content of the present invention will be further described:

[0020] Such as figure 1 As shown, a nitrogen self-pressurized air separation plant includes an air compressor 1 that compresses external air, a molecular sieve purification device 2 that purifies the air output by the air compressor 1, and a device that expands and refrigerates the purified air. Supercharged turboexpansion device 3, the rectification tower 5 that will separate the air passing through supercharged turboexpansion device 3 into oxygen and nitrogen, and the heat exchanger 4 for the gas in the air separation device to exchange heat; the heat exchange The device 4 and the rectifying column 5 are located in the cold box 9.

[0021] Described air separation unit also comprises that described pre-cooling device 8 that is located between air compressor 1 and molecular sieve purification unit 2 is a water chiller, and it is according to the vari...

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Abstract

The invention discloses a nitrogen self-pressurization air separation device which comprises an air compressor used for compressing external air, a molecular sieve purification device used for purifying air output by the air compressor, a pressurization turbine expansion device used for conducting expansion refrigeration on the purified air, a rectifying tower used for separating air passing through the pressurization turbine expansion device into oxygen and nitrogen, and a heat exchanger used for conducting heat exchange on gas in the air separation device. The rectifying tower comprises an upper tower and a lower tower, and a main condensation evaporator is arranged at the bottom of the upper tower. The air separation device further comprises a liquid nitrogen evaporator, and the liquidnitrogen evaporator is arranged to be lower than the main condensation evaporator. By means of the nitrogen self-pressurization air separation device, the requirements for nitrogen and oxygen of userscan be met at the same time, in addition, both the pressure and purity of nitrogen and oxygen can meet the requirements of users, and the gas production cost is reduced.

Description

technical field [0001] The present invention relates to an improvement of air separation equipment, in particular to a nitrogen gas that utilizes the static pressure of the liquid nitrogen itself to increase the pressure of nitrogen gas, without raising the exhaust pressure of a matching air compressor to make nitrogen self-pressurized Self-pressurizing air separation unit. Background technique [0002] Air separation equipment is widely used in the fields of petroleum, chemical industry, building materials, metallurgy and environmental protection; in the air separation process of conventional molecular sieve purification and supercharged turbo expander refrigeration, in order to obtain the pressure of the corresponding nitrogen product, it is necessary to match the corresponding The exhaust pressure of the air compressor is matched; if the user wants to increase the pressure of the nitrogen product, the exhaust pressure of the air compressor needs to be increased accordingl...

Claims

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Application Information

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IPC IPC(8): F25J3/04
CPCF25J3/04054F25J3/04157F25J3/04169F25J2210/40F25J2220/40F25J3/04084F25J3/04103F25J3/04206F25J3/04303F25J3/04393F25J3/04412F25J3/04884F25J3/04957F25J2230/24F25J2230/40F25J2240/04F25J2245/40F25J2250/40F25J2250/42
Inventor 缪华
Owner 苏州制氧机股份有限公司
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