A device and method for coupling carbon dioxide capture and methane reforming process to co-produce syngas

Abstract

A device and method for co-producing syngas by coupling carbon dioxide capture and methane reforming process, methane reacts with the first oxygen carrier in a fuel reactor to generate CO 2 and H 2 O, the reduced first oxygen carrier is transferred to the air reactor to react with the air to replenish lattice oxygen, and then the first oxygen carrier recovered after oxidation is returned to the fuel reactor again to provide lattice oxygen for the combustion reaction of methane, and the cycle Use: feed methane into the reduction reactor, methane reacts with the second oxygen carrier in the reduction reactor to generate synthesis gas CO and H 2 ; High-purity CO obtained by separation 2 After entering the oxidation reactor, the reduced second oxygen carrier in the reduction reactor is transferred to the oxidation reactor, re-oxidized and then enters the reduction reactor for recycling. This method implements the CO 2 The low-cost capture and on-site conversion and utilization of synthetic gas also improve the quality and selectivity of the synthesis gas, optimize the structure and composition of the reactor, and meet the requirements of the concept of circular economy.

Description

technical field [0001] The invention belongs to CO 2 Efficiency reduction and CH 4 In the field of conversion and utilization, it specifically relates to a device and method for coupling carbon dioxide capture and methane reforming process to co-produce syngas. Background technique [0002] The energy problem has always been a world problem. Under the dual pressure of resource depletion and ecological environment deterioration, it is inevitable to find clean energy. As one of the three major fossil energy sources, natural gas has the advantages of high calorific value per unit mass and low pollution in the combustion process. With the discovery of unconventional natural gas resources, the source and recoverable amount of natural gas are more abundant. Unconventional natural gas resources mainly include coalbed methane, shale gas, water-soluble gas, inorganic gas, natural gas hydrate, tight sandstone gas and shallow biogas etc. China's unconventional natural gas resources h...

AI Technical Summary

Problems solved by technology

But the process will also have 2CO=CO 2 +C,CH 4 =C+2H 2 ,CO+H 2 =C+2H 2 O and other side reactions, in which the main reaction is a strong endothermic reaction, is conducive to the occurrence of the reaction only under high temperature conditions, and high temperature increases energy consumption, and also causes side reactions to generate carbon deposits, which seriously affects the activity of the catalyst.

The reaction of POM to synthesis gas is: CH 4 +1 / 2O 2 =CO+2H 2 , the technology has a high reaction rate, and the H in the product gas 2 The molar ratio of / CO is 2, which can be directly applied to subsequent reaction sections such as Fischer-Tropsch synthesis, but this reaction needs to use pure oxygen as an oxidant, and the operation cost of preparing pure oxygen by air separation is relatively high; and pure oxygen is very easy to produce with methane Deep oxidation, which severely reduces the selectivity of syngas

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