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A device and method for cryogenic separation and purification of nitrogen and liquid nitrogen

A cryogenic separation, liquid nitrogen technology, applied in refrigeration and liquefaction, liquefaction, solidification and other directions, can solve the problems of high energy consumption, complex operation, not easy for users to operate, etc., to achieve low energy consumption, simple operation, small footprint small effect

Active Publication Date: 2016-05-18
GUCHENG HONGTAI GAS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above process forms are suitable for small-scale nitrogen-generating equipment. With the expansion of the scale of nitrogen-generating equipment, the disadvantages of the above-mentioned process forms are high energy consumption, complicated operation, and not easy for users to operate.

Method used

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  • A device and method for cryogenic separation and purification of nitrogen and liquid nitrogen

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Embodiment 1

[0026] A device for cryogenic separation and purification of nitrogen and liquid nitrogen, such as figure 1As shown, it includes an air compression system 1, an air precooling system 2, an air purification system 3 and a fractionation tower system 4, and the fractionation tower system includes a main heat exchanger 7, a booster end 5 of a turboexpander, a turboexpansion Expansion end 8 of machine, single-stage rectifying tower 9, liquid nitrogen subcooler 11; Described air compression system is connected with air precooling system by first pipeline 101, and described air precooling system is connected with air precooling system by second pipeline 102 The air purification system is connected, the air purification system is connected to the third pipeline 103, the third pipeline is connected to the fourth pipeline 104 and the fifth pipeline 105, and the fourth pipeline is connected to the single-stage rectification system through the main heat exchanger. At the gas inlet of the ...

Embodiment 2

[0029] A method for cryogenic separation and purification of nitrogen and liquid nitrogen, the method comprising:

[0030] 1) The raw material gas is air, and the air is first compressed by the air compression system 1. After compression, the pressure is 0.48Mpa and the temperature is 100°C. The gas enters the air precooling system 2 through the first pipeline 101 for cooling, and is cooled to 8~17°C. The cooled gas enters the air purification system 3 through the second pipeline 102, and after the air purification system absorbs water, carbon dioxide and some hydrocarbons, enters the fractionation tower system 4 through the third pipeline 103, and the gas entering the fractionation tower system is divided into Two parts: a part of the gas enters the supercharging end 5 of the turboexpander through the fifth pipeline 105, and then is sent to the cooler 6 through the sixth pipeline 106, and then passes through the seventh pipeline 107 in the main heat exchanger 7 after being coo...

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Abstract

The invention relates to a device and a method for cryogenic separation and purification of nitrogen and liquid ammonia. According to the method, the air as a raw material sequentially passes through an air compression system for compression, a pre-cooling system for cooling, and a purification system for impurity removal, followed by entering a fractionating tower; the air entering the fractionating tower is divided into two parts, wherein one part of the air enters a pressure boost end for boosting pressure, is subjected to heat exchange through a cooler, and enters a main heat exchanger, the air is pumped by the lower portion of the main heat exchanger to enter an expansion end for heat insulation expansion, and the expanded air is recuperated by the main heat exchanger and discharged out of a cooling box; the other part of the air directly enters the main heat exchanger to be cooled to a liquefaction point and then enters a single-stage rectifying tower for rectification. A nitrogen product is pumped from the top of the single-stage rectifying tower, is recuperated to a normal temperature by the main heat exchanger, and enters a nitrogen collection unit through a valve, a liquid ammonia product is pumped from a main cooled liquid nitrogen side, the liquid ammonia product and a small part of returned liquid ammonia are subjected to heat exchange and supercooling through a liquid ammonia supercooler, and subsequently, the liquid ammonia product enters a liquid ammonia collection unit through a valve. According to the device and the method for cryogenic separation and purification of the nitrogen and the liquid ammonia, the process flow is simple in operation, high in extraction rate, low in energy consumption, and meanwhile, device investment costs are low.

Description

technical field [0001] The invention relates to the field of air separation, in particular to a device and method for cryogenically separating and purifying nitrogen and liquid nitrogen. Background technique [0002] With the rapid development of industry, nitrogen has been widely used in chemical industry, electronics, metallurgy, food, machinery and other fields. Nitrogen is a chemically inert gas that does not react easily with other substances. Therefore, nitrogen is widely used as protective gas and sealing gas in metallurgical industry, food refrigeration, electronic industry and chemical industry. Generally, the purity requirement of protective gas is 99.99%, and some require pure nitrogen above 99.998%. [0003] As the demand for nitrogen products increases, the scale of pure nitrogen equipment is also increasing. The process form of pure nitrogen equipment has also been changing and introducing new ones. [0004] At present, the processes adopted by pure nitrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/04
Inventor 卓跃光王庆波彭喜魁年涛孟庆烜任铁柱陈国庆赵洪赵媛媛张惠媛张勇强
Owner GUCHENG HONGTAI GAS CO LTD
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