Shallow carbon monoxide conversion method and system

Abstract

The invention discloses a shallow carbon monoxide conversion method and a shallow carbon monoxide conversion system. The method comprises the following steps: introducing water gas into a front waste heat boiler, and absorbing sensible heat and latent heat, so that the water-gas ratio in the water gas is reduced; separating the condensate water, adding processing condensate water into a gasification island; heating the water gas; carrying out a detoxification reaction on the water gas; allowing the detoxified water gas to enter a water heat transfer shift converter, and recycling the reaction heat by adopting water; recycling the sensible heat and latent heat in the shifted gas by adopting deoxygenated water; continuously recycling the sensible heat and latent heat in the shifted gas in the previous step by virtue of desalted water, and separating the processing condensate water; washing ammonia in the converter by virtue of the desalted water; flashing gas in the processing condensate water by adopting low-pressure steam; performing torch burning on tail gas; and introducing the processing condensate water into the gasification island. The outlet temperature of the shifted gas is less than or equal to 40 DEG C under the condition that circulating cooling water is not used; and moreover, the practicality is high, all raw material gas conversion processes can be met, and the method can be used for new projects and also can be used for oil unit transformation.

Description

technical field [0001] The invention relates to a technology for converting raw gas CO, in particular to a method and system for shallow conversion of carbon monoxide. Background technique [0002] Coal chemical industry, natural gas chemical industry, coal bed methane chemical industry, and biogas chemical industry will have raw material gas CO that needs to be converted, especially pulverized coal gasification, coal water slurry gasification, GSP, multi-nozzle, Shell (shell) and other pressurized coal continuous gas The high water-gas ratio and high CO produced by the chemical furnace need to have a suitable temperature and pressure under the conditions of the presence of catalysts (catalyst types include iron-based catalysts, cobalt-molybdenum-based catalysts, and copper-zinc-based catalysts) to make CO and H 2 O generates CO 2 and H 2 achieve the conversion of CO into H 2 The purpose of its reaction equation is: [0003] The existing shift furnaces are all adiabati...

AI Technical Summary

Problems solved by technology

When selecting the amount of catalyst for the "one-stage adiabatic converter", if the TF is selected to be large, the amount of catalyst will be less, and the conversion rate of the "one-stage adiabatic converter" will not meet the requirements, which will increase the load on the subsequent converter, and the heat energy recovery and design of the system The deviation between the values ​​is very large; if TF is small, the amount of catalyst used in the "one-stage adiabatic shift furnace" will be large, and the "one-stage adiabatic shift furnace" will be overheated (catalyst burnout is likely to occur), and methane will be brought Chemical side reactions increase, and bring great safety hazards to system operation;

[0005] The transformation devices of large coal chemical plants such as coal-to-oil, coal-to-methanol, coal-to-olefins, coal-to-(cyclo)alkanes, coal-to-natural gas, coal-to-ethylene glycol, coal-to-formic acid, etc. still adopt the "transformation + no

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