Double-efficient energy-saving methanol rectifying apparatus and method

Abstract

A methanol dual-effect rectification energy-saving apparatus and its method are disclosed. The apparatus consists of crude methanol pre-heater, pre-rectified tower, pressurizing tower, normal-pressure tower, re-boiler, condenser and methanol recovering tower. The normal-pressure tower and methanol recovering tower have whole-body structure, both them are connected with rising cap, steam condensing pipes of re-boilers of pre-rectified tower, pressurizing tower and methanol recovering towers are communicated with crude methanol pre-heaters separately, discharging pipe on bottom of pressurizing tower is connected with charging pipe in middle of methanol recovering tower. It can make full use of space, save the floor area, power and heat energy and has less consumption.

Description

Technical field [0001] The invention relates to the technical field of rectification, and particularly relates to a methanol double-effect rectification energy-saving equipment and method. Background technique [0002] Methanol is a very important basic chemical raw material and a promising clean energy and power fuel. It plays a pivotal role in the current global chemical product market. In recent years, due to the development of methanol and changes in the world's energy structure, new products using methanol as raw materials have been continuously developed, and the world's production and demand for methanol have been increasing year by year. [0003] Distillation is a very important chemical unit operation in methanol production, and it is directly related to product quality, environmental protection, energy consumption and production costs. The energy consumption of the distillation process accounts for 10-20 of the total energy consumption. %, so ...

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Problems solved by technology

But there are still many deficiencies: first, the pipelines of the whole rectification process are complicated, especially in the three-plus-one-tower process, the methanol recovery tower and its ancillary equipment take up a lot of space; second, in the current methanol double-effect rectification process, often The pressure column reboiler is a vertical heat exchanger. In order to make the material flowing out from the bottom of the atmospheric column enter the atmospheric column after heat exchange, the base of the atmospheric column is usually very high, generally reaching 5 to 6 meters, which wastes the space at the bottom of the column.

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