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Nitrous oxide low-temperature recycling system and method

A nitrous oxide recovery system technology, applied in liquefaction, refrigeration and liquefaction, solidification, etc., can solve the problems of not being suitable for large separation devices, unsatisfactory condensation effect, large consumption of condensing agent, etc., to achieve good refrigeration effect and automation High effect with less equipment

Inactive Publication Date: 2015-10-07
KAIFENG AIR SEPARATION GROUP
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Problems solved by technology

[0004] The application number is 201310308364.1, and the Chinese patent titled a system for recovering and purifying argon oxide and nitrogen in industrial tail gas provides a recovery and purification process for nitrous oxide, but the separation and purification process has the following disadvantages: two-stage Separation of the rectification tower requires complex operation; the use of antifreeze as the condensing agent in the rectification tower condenser is likely to cause secondary pollution, and the condensation effect is not ideal. In addition, it needs to consume a large amount of condensing agent when it is large-scale, so it is not suitable for large-scale separation devices

Method used

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  • Nitrous oxide low-temperature recycling system and method

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Embodiment 1

[0019] A low-temperature recovery system for nitrous oxide, such as figure 1 As shown, the main equipment is a low-temperature liquefaction separation cold box 1 and a nitrogen cycle compressor 7, and the low-temperature liquefaction separation cold box 1 includes a main heat exchanger 3, a condenser 4, a rectification tower 2, a separator 5, and an expander 6; the rectification tower 2 includes a tower body and a reboiler 8 . Described main heat exchanger 3, rectifying tower 2, condenser 4, separator 5 are connected successively; Described nitrogen cycle compressor 7, compressor aftercooler 9, reboiler 8, main heat exchanger 3. The expander 6 and the condenser 4 are connected in sequence to form a nitrogen circulation loop.

[0020] The main heat exchanger 3, the condenser 4 and the reboiler 8 are vacuum brazed aluminum plate-fin heat exchangers; the rectification tower 2 is a packed tower or a plate tower; the expander 6 is an air shaft expander or an oil shaft expander; t...

Embodiment 2

[0022] A low-temperature recovery method for nitrous oxide, comprising the following steps: the pretreated nitrous oxide-containing feed gas enters a main heat exchanger 3 and is cooled to -50°C~-60°C, and then enters the rectification tower 2 for rectification Separation, the nitrous oxide product with a purity greater than 99.999% is obtained at the bottom of the rectification tower 2, the liquid product is sent to the liquefaction cold box 1, the temperature of the evaporation side of the reboiler at the bottom of the tower is -15°C~-25°C, and the second tower of the rectification tower The gas extracted from the top enters the condenser 4 to condense to -80°C~-88°C and enters the vapor-liquid separator 5, the liquid phase reflux rectification column 2 The top of the column is used as reflux liquid, the separator gas phase reflux condenser 4, and the main heat exchanger 3. The reheated liquefaction separation cold box 1, the gaseous phase after reheated can be used as a supp...

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Abstract

The invention relates to a nitrous oxide low-temperature recycling system and method. Main devices include a main heat exchanger, a condenser, a fractionating tower, a separator, an expansion machine and a nitrogen circulation compressor. Single-tower low-temperature fractionation is adopted, and a liquid nitrous oxide product with the purity higher than 99.999% can be obtained; in addition, waste gas obtained by separating raw material gas is used for supplementing the nitrogen circulation compressor to manufacture a refrigerating medium, the refrigerating medium does not need to be specially purchased, expansion refrigeration is achieved through an expansion machine, the nitrous oxide low-temperature recycling system and method are economical and applicable, operation is easy, load varying is more flexible, and the nitrous oxide low-temperature recycling system and method are suitable for small or large nitrous oxide purifying and separating devices.

Description

technical field [0001] The invention relates to the field of gas separation, in particular to a low-temperature recovery system and recovery method for nitrous oxide. Background technique [0002] Nitric acid and adipic acid are both important chemical raw materials. A large amount of nitrogen oxide gas tail gas is produced during production. The main components of the pretreated tail gas are nitrogen and nitrous oxide. Nitrous oxide gas is the most serious damage to the earth's atmosphere. One of the gases, it can cause the greenhouse effect and the destruction of the ozone layer, direct emission will cause serious environmental problems. Usually complex catalytic reduction method is used to decompose it into harmless nitrogen and oxygen for emission. [0003] Nitrous oxide has important applications and can be used in the electronics industry, fuel for racing car acceleration systems, and rocket oxidizers. Certain methods can be used to purify and recover the nitrous oxid...

Claims

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Application Information

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IPC IPC(8): F25J3/02
Inventor 韦向攀王剑峰卓跃光
Owner KAIFENG AIR SEPARATION GROUP
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