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Method for removing nitrogen monoxide gathering in large oxygen-making machine

A nitrous oxide and oxygen generator technology, applied in refrigeration and liquefaction, liquefaction, solidification and other directions, can solve the problems of waste of cooling capacity, non-recovery, and explosion of hydrocarbons in oxygen generators, so as to reduce and eliminate power costs. Potential safety hazards and small cooling loss

Active Publication Date: 2007-10-10
WUHAN IRON & STEEL GRP GAS CO LTD
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AI Technical Summary

Problems solved by technology

[0003] However, in large oxygen generators, due to the limited diameter of the non-condensable gas pipe in the methane removal tower (such as the non-condenser pipe DN25 in Figure 1), it is not enough to discharge the non-condensable gas in the liquid oxygen at the bottom of the methane removal tower through this pipeline.
After the oxygen generator runs for a long time, the nitrous oxide and other hydrocarbons in the liquid oxygen at the bottom of the methane removal tower will be concentrated and accumulated on the surface of the heat exchanger for a long time, resulting in the reduction of the heat exchange area of ​​the liquid oxygen evaporator and resulting in methane removal. The evaporation pressure of the tower drops, which may cause the explosion of hydrocarbons
[0004] In order to remove the nitrous oxide accumulated on the surface of the liquid oxygen evaporator, the usual method is to heat the oxygen generator as a whole. Although this can completely remove nitrous oxide and other hydrocarbons, it will cause cold in the oxygen generator. Quantity (including liquid) is completely wasted, cannot be recycled, and the economic loss is huge

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  • Method for removing nitrogen monoxide gathering in large oxygen-making machine

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Embodiment Construction

[0016] 1 preliminary preparation

[0017] As shown in Figure 1, before the large-scale oxygen generator is ready to stop, the liquid oxygen at the bottom of the low-pressure tower 23 is sent into the tank to reduce the liquid oxygen level as much as possible; the liquid in the pressure tower 22 is sent to the low-pressure tower 23 to reduce the pressure as much as possible The liquid air liquid level of tower 22; Open the drain valve at the bottom of methane removal tower 20 to drain liquid, make the liquid oxygen liquid level at the bottom of methane removal tower 20 lower as far as possible; Air compressor 29 is unloaded; Stop the gas and liquid of large oxygen generator product output.

[0018] 2 switch valve

[0019] As shown in Figure 1, open the air outlet valve 2 of the argon plate heat exchanger 26, open the safety valve 3 on the top of the demethanizer 20, and open the air channel from the liquid oxygen evaporator 24 to the argon plate heat exchanger 26 in the demeth...

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Abstract

A method for removing off accumulation of nitrogen oxide in oxygenerator includes stopping output of gas and liquid product from oxygenerator, opening certain valves and closing certain valves, leading in dried and normal-temperature compressed air to demethane tower from top and bottom of demethane tower then carrying out mono-block heating on demethane tower.

Description

technical field [0001] The invention relates to a method for removing the accumulation of nitrous oxide, in particular to a method for removing the accumulation of nitrous oxide in a large oxygen generator. Background technique [0002] Most of the large oxygen generators are equipped with a methane removal tower, whose main function is to remove most of the methane in the liquid oxygen and bring it out of the methane removal tower after the liquid oxygen evaporates; after the liquid oxygen evaporates, the pressure of the methane removal tower is increased, increasing Oxygen penetrates the suction pressure to reduce energy consumption; secondly, it plays the role of rectifying the content of krypton and xenon components in concentrated liquid oxygen. A small amount of compressed air entering the lower tower is condensed into liquid air and returned to the lower tower to increase the moisture content in the air entering the lower tower, which is essentially an auxiliary conde...

Claims

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Application Information

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IPC IPC(8): F25J3/04
CPCF25J3/04745F25J2215/56F25J3/04412F25J3/04824F25J3/0486F25J2220/52F25J2200/34F25J3/04878
Inventor 曹尚峰田明勇张立周伟
Owner WUHAN IRON & STEEL GRP GAS CO LTD
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