Integrated system for bog helium extraction process

Abstract

The invention provides an integrated system for a bog helium extraction process. The integrated system comprises a catalytic oxidation reactor, a low-temperature adsorber and a mixing tank, the catalytic oxidation reactor is provided with an anti-impact cap, so that the impact of mixed gas on a catalyst bed layer can be reduced, and catalyst abrasion is reduced; the catalyst can be conveniently replaced by arranging a charging opening and a discharging pipe; by arranging a plurality of side temperature monitoring devices, the bed temperature and the catalytic oxidation reaction position can be monitored; and by arranging the lower -temperature monitoring device which is as high as the side temperature monitoring device at the bottommost part, the temperature can be monitored, and the flowing uniformity of the mixed gas in the bed layer can be analyzed. An inner separator is arranged in the low-temperature adsorber, nitrogen with the content exceeding 4.5% in crude helium is converted into liquid nitrogen to be separated out, the adsorption load of the adsorber on high nitrogen is reduced, and the adsorption time is prolonged; in order to ensure that the activated carbon adsorbent can be in a low-temperature state, a liquid nitrogen central pipe is arranged in the center of each adsorber; and the five adsorbers are connected in series, so that the activated carbon adsorbent is completely in a low-temperature state.

Description

technical field [0001] The invention specifically relates to an integrated system for bog helium extraction process. Background technique [0002] BOG gas refers to the non-condensable gas that cannot be liquefied or evaporated from the liquefied natural gas storage tank during the liquefaction of natural gas to produce LNG. The flow rate of BOG gas is considerable, accounting for about 8% of the raw gas flow at most. Therefore, LNG The production process will have a special recovery process to recover BOG gas. The common BOG recovery scheme for LNG is that the BOG gas in the LNG storage tank is compressed to medium pressure through the BOG compressor, part of the gas is burned as fuel gas, and the rest is passed through the BOG compressor. It is further compressed to the same pressure as the raw gas, and according to the conditions of the LNG device, it is merged back to the pretreatment of the raw gas or after the pretreatment of the raw gas, and then liquefied again. [...

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Problems solved by technology

[0003] The existing equipment for bog helium extraction process has problems of low stability and safety in the catalytic oxidation reactor, cryogenic adsorber and mixing tank due to unreasonable structural design. Therefore, an integrated bog helium extraction process is proposed. system to solve this problem

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