Crude neon and helium extracting device suitable for force-exhaust nitrogen in air separation column and extracting method of crude neon and helium extracting device

Abstract

The invention discloses a crude neon and helium extracting device suitable for force-exhaust nitrogen in an air separation column and an extracting method of the crude neon and helium extracting device. A circulating pipeline is connected to a poor neon and helium column and the bottom of an upper column; a liquid nitrogen pipeline, a pressure nitrogen pipeline and a liquid-air pipeline are connected to a lower column and the poor neon and helium column; a poor neon and helium gas pipeline is connected between the crude neon and helium column and the poor neon and helium column; a main pipeline communicates with the top of the crude neon and helium column; a crude neon and helium gas collecting opening is also formed in the crude neon and helium column; liquid nitrogen and pressure nitrogen are introduced into the poor neon and helium column for extracting neon and helium components; the poor neon and helium column obtains the poor neon and helium gas and pressure nitrogen product gas;liquid nitrogen at the bottom of the poor neon and helium column enters the upper column and the crude neon ad helium column respectively; the poor neon and helium gas is transmitted into the crude neon and helium column for further rectification, and crude neon and helium gas is obtained in the crude neon and helium column; and the liquid nitrogen obtained in the crude neon and helium column istransported back to the poor neon and helium column for further rectification. According to the crude neon and helium extracting device disclosed by the invention, the total extraction rate of the neon and helium in the air separation column is as high as 90% or above, the pressure, the yield and the purity of the pressure nitrogen are not influenced, the heat load of a main cooling column is shared, and the air separation energy consumption is reduced.

Description

technical field [0001] The invention relates to a crude neon-helium extraction device and an extraction method thereof, more specifically, to a crude neon-helium extraction device and an extraction method suitable for pumping nitrogen air separation, and belongs to the field of rectification air separation. Background technique [0002] Compared with oxygen and nitrogen, rare gases have higher value, and are mainly extracted through cryogenic separation air separation equipment. China has a large amount of air separation equipment, but to extract rare gases, further transformation is required to increase rare gas extraction equipment. The boiling point of neon and helium is low, and a large amount is enriched at the top of the lower air separation tower. For the air separation with a large amount of nitrogen product under the pumping pressure of the lower tower, a large amount of neon and helium components are pumped away with the pressure nitrogen product. If the existing cr...

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Problems solved by technology

[0004] The above-mentioned method for extracting thick neon-helium products from air separation liquid nitrogen has the following problems: the method only extracts neon-helium in liquid nitrogen, and the extraction rate of neon-helium in liquid nitrogen is greater than 80%, but does not extract neon-helium in pressure nitrogen For the helium component, for the air separation where the ratio of pressure nitrogen output to air separation oxygen output is 1:2, the content of neon and helium in the pressure nitrogen accounts for about 40% of the content of neon and helium in the total raw material air. This part of neon and helium is not extracted, and the total amount of neon and helium The extraction rate will not exceed 60%

Therefore, the market is in urgent need of an extraction device and its extraction method that can not only solve the problem of low extraction rate of neon and helium in air separation with a large amount of pressure nitrogen products, but also ensure the output and purity requirements of users' pressure nitrogen products.

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