Method for increasing yield of rectisol and/or liquid oxygen wash greatly and saving energy through pressure swing adsorption technique and device thereof

Abstract

According to a method disclosed in the invention for increasing yield of rectisol and / or liquid oxygen wash greatly and saving energy through pressure swing adsorption technique, the desulfurized gas or transformed gas is divided into two branches. One branch enters a pressure swing adsorption decarburization device for decarburization, and the other branch enters a low-temperature methanol carbon washing device for decarburization. The decarburized gas after decarburization of the voltage swing adsorption decarburization device enters a voltage swing adsorption hydrogen purification device for obtaining hydrogen product, and a hydrogen-nitrogen synthesis gas is obtained after allocating the nitrogen. The decarburized gas after decarburization of the voltage swing adsorption decarburization device enters a liquid hydrogen washing device, and the hydrogen-nitrogen synthesis gas is obtained after purification. After mixing the two branches of hydrogen-nitrogen synthesis gas and compressing the mixture in a synthesis gas compressor, the compressed gas enters an ammonia synthesis period. The invention also discloses a device for realizing the method. A yield increase amplitude which is higher than 50% can be realized according to the invention.

Description

technical field [0001] The invention belongs to the technical field of synthesis gas production, and is particularly applicable to a synthesis gas device using coal, residual oil, asphalt, petroleum coke, etc. Energy saving method and device. technical background [0002] At home and abroad, the purification section of most ammonia synthesis plants with a scale of 1,000 tons / day and above that uses coal or residual oil as raw materials uses low-temperature methanol to elute sulfur and decarbonization, and liquid nitrogen to remove methane and carbon oxides for deep purification. Produce fresh synthesis gas that meets the requirements of ammonia synthesis; there are also ammonia synthesis devices that use polyethylene glycol dimethyl ether method (Selexol method abroad, NHD method in China) for desulfurization, decarbonization and purification. [0003] The low-temperature methanol elution sulfur decarburization purification method uses low-temperature methanol as a solvent ...

AI Technical Summary

Problems solved by technology

Its process is complicated, the process is long, there are many equipments, the layout is compact, the transformation is difficult, the transformation time is long, and it is closely related to the liquid nitrogen washing device, which is the core section of the ammonia synthesis device; Causing the chain transformation of refrigeration equipment, so the correlation between the sections is strong, and the transformation of low-temperature methanol washing is difficult

[0006] The liquid nitrogen washing device includes molecular sieve purification and cold box. The investment of molecular sieve purification accounts for more than half of the liquid nitrogen washing device. In particular, the program-controlled shut-off valve is the core and the price is high; the working temperature of the cold box is lower, the equipment layout is compact, and it is difficult to transform

[0007] Therefore, it is very difficult to increase the production of the low-temperature methanol washing device and the liquid nitrogen washing device, and it is even more difficult to transform them together.

Coupled with the corresponding supporting modification of the refrigeration unit, such a modification is almost impossible

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