Split-flow rectisol device

Abstract

The present invention discloses a split-flow rectisol device, which comprises an absorption tower, a medium pressure flash tower, a reabsorber, a hot regenerating tower, a methanol water tower, a tail gas washing tower, a plurality of heat exchangers, pumps and a circulation compressor; and the upper section of the reabsorber is provided with a flash distillation section. The split-flow rectisol device is not provided with a CO2 product tower, and reduces the complexity of the flow and the investment on the premise of ensuring that CO2 product gas is qualified. The split-flow rectisol device is provided with a novel split-flow rectisol (acid gas removal) flow for absorption from a semi-lean methanol liquid feeding absorption tower on the upper section of the reabsorber, reduces the dosage of lean methanol of the absorption tower, further can reduce the energy consumption of the hot regenerating tower for hot regeneration, and saves the dosage of gas stripping nitrogen, consumption of steam, and low level cold quantity used when the lean methanol is cooled.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to a split-flow low-temperature methanol washing device that uses low-temperature methanol as an absorbent to remove impurities such as organic impurities, CO2, sulfide, and moisture in mixed gas. The split-type low-temperature methanol washing device is suitable for purification of synthetic gas (containing hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, nitrogen, methane, etc.) to produce synthetic ammonia, synthetic methanol, synthetic oil (gasoline, diesel, etc.) and synthetic natural gas (SNG) Low-energy new split-type low-temperature methanol washing (acid gas removal technology) for LNG (liquefied natural gas) purification in other fields or natural gas purification. Background technique [0002] The low-temperature methanol washing technology uses low-temperature methanol as an absorbent, and uses the physical characteristics of methanol to have a high ...

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Problems solved by technology

[0016] (1) The heat exchange network is complex, the logistics are highly correlated, the whole device takes a long time to start, and the control stability is difficult

[0017] (2) Methanol used for absorption is all heat-regenerated lean methanol, and the regeneration energy consumption is high

[0018] (3) Multiple coiled tube heat exchangers are used, for example, the first multi-stream heat exchanger E1, the third heat exchanger E3, and the fourth heat exchanger E4 must use coiled tube heat exchangers; the seventh heat exchanger The heat exchanger E7, the eighth heat exchanger E8, and the ninth heat exchanger E9 also use coiled tube heat exchangers, and the heat balance between the heat exchangers has a large influence on each other, and the investment is large.

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