Process method for preparing synthesis gas by using zero carbon or negative carbon emission system

Abstract

The present invention discloses a process method for preparing synthesis gas by using a zero carbon or negative carbon emission system. The process method comprises that: 1) first raw material gas is subjected to desulfurization, steam is matched, pressurization and heating are performed, a reaction is performed to obtain first conversion gas, the first conversion gas is output, the output first conversion gas and pure oxygen are mixed and then enter a two-stage furnace to react so as to obtain second conversion gas, and the second conversion gas is output from the two-stage furnace; 2) second raw material gas is subjected to desulfurization, pressurization and heating and then is mixed with pure oxygen and carbon dioxide, then a reforming reaction is performed to obtain third conversion gas, and the third conversion gas is output from the reforming reactor; and 3) the second conversion gas is subjected to heat recovery and then is mixed with the third conversion gas to form crude synthesis gas, wherein the crude synthesis gas is adopted as the subsequent synthesis gas with or without a decarbonization device. According to the present invention, the greenhouse gas emission is reduced, the carbon efficiency is improved, the recycling of the carbon resources of the energy source chemicals is achieved, the hydrogen-carbon ratio of the synthesis gas achieves the ideal ratio of the downstream process requirement, and the zero carbon or negative carbon emission of the whole system is achieved.

Description

technical field [0001] The invention relates to a process method for preparing synthesis gas, in particular to a process method for preparing synthesis gas using a zero-carbon or negative carbon emission system. Background technique [0002] In 2005, in response to the trend of continuous warming of the national climate, in order to protect human beings from the threat of drastic climate change, the Kyoto Protocol to reduce carbon dioxide emissions was promulgated. Therefore, the reduction and effective use of carbon dioxide emissions have become an urgent issue. Using carbon dioxide as a carbon and oxygen resource to prepare synthesis gas through high-temperature catalytic conversion has become an important way for large-scale chemical utilization of carbon dioxide. Using two greenhouse gases, methane and carbon dioxide, to carry out reforming reactions to prepare synthesis gas can not only achieve direct reduction of carbon dioxide emissions under low-carbon scenarios, but...

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Problems solved by technology

However, this process cannot realize the efficient utilization of carbon dioxide, therefore, the reduction of greenhouse gas emissions and the recycling of carbon resources of energy chemicals cannot be carried out

[0006] Chinese Patent No. 200710177471.X's "Methane Reforming Method and System for Coal Gasification Sensible Heat Polygeneration Energy Method and System" also mentioned the characteristics of carbon-rich gasification gas and hydrogen-rich reforming reaction gas, according to the characteristics of chemical products Production requires mixing the two in different proportions, eliminating the need for conversion processes in the production process of traditional coal-based chemical products. However, this process also cannot achieve efficient use of carbon dioxide

However, the process system control is complex

[0008] Therefore, in the existing synthesis gas preparation process, in order to achieve a suitable hydrogen-to-carbon ratio, a large amount of carbon dioxide is produced by the CO shift reaction or the resource utilization of carbon dioxide cannot be realized, or the synthesis gas produced by a single carbon dioxide-methane reforming reaction has a low hydrogen-to-carbon ratio and cannot Directly used in methanol synthesis or the defect of Fischer-Tropsch process, it is necessary to develop a synthesis gas preparation method that can not only improve carbon utilization efficiency but also realize resource utilization of greenhouse gases

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