Energy-saving and production-increasing method and device adopting low temperature methanol cleaning technology

Abstract

The invention discloses an energy-saving and production-increasing method and an energy-saving and production-increasing device both adopting the low temperature methanol cleaning technology, and the method is mainly characterized in that liquid phase sulphur-free methanol from a rich methanol medium pressure flash vaporization tank V02 enters a newly added rich methanol medium pressure flash vaporization tank V09 for flash vaporization; the liquid phase, after flash vaporization, is pressurized by a semi-lean methanol pump P09 first and is conveyed, as semi-lean liquid, to the middle part of the ninth section of an absorption tower C01; the semi-lean liquid, serving as the main absorption methanol, is capable of reducing energy consumption during the low temperature methanol cleaning; besides, as a rich methanol turbine pump and a sulphur-containing methanol turbine pump are additionally arranged between a rich methanol ammonia cooler and a sulphur-containing methanol ammonia cooler, and the rich methanol medium pressure flash vaporization tank and the sulphur-containing methanol medium pressure flash vaporization tank, the energy generated during decompression of sulphur-free rich methanol and sulphur-containing rich methanol is fully recovered and can be further used to replace part of the electric energy needed by a lean liquid pump and a newly added semi-lean liquid pump, so that the power consumption of the device can be reduced.

Description

technical field [0001] The present invention relates to the technical field of low-temperature methanol washing and purifying synthesis gas treatment, and in particular to a method and device for energy-saving and production-increasing low-temperature methanol washing. On the basis of the original process, semi-lean methanol is introduced as the main washing methanol to reduce the amount of lean methanol, so as to achieve the goal of energy saving and production increase. Background technique [0002] Given that my country is a country with a lot of coal and little gas, at present, most chemical companies use coal as raw material to make synthetic gas. In view of the wide applicability of low-temperature methanol washing and the cheap and easy-to-obtain raw materials, almost all coal chemical enterprises are equipped with low-temperature methanol washing sections to remove H from syngas. 2 S / CO 2 and other components. [0003] At present, the low-temperature methanol wash...

AI Technical Summary

Problems solved by technology

The temperature of the exhaust gas after scrubbing is usually low and it is directly discharged into the atmosphere, so the low-temperature cooling capacity in the exhaust gas is not used

[0012] (5) According to the actual operation effect of the above process, the acid gas H at the top of the thermal regeneration tower C04 2 S concentration is low

Increased fuel consumption for downstream Claus sulfur recovery

[0013] (6) Judging from many actual production conditions, most of the low-temperature methanol washing devices using the above-mentioned process currently have high methanol consumption and high methanol concentration in the tail gas

caused some harm to the environment

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