Circulation fluid bed hydrogen preparation reaction technology and reaction device by reforming methane and water steam

Abstract

A reaction technics of producing hydrogen from methane reforming with steam on circulating fluidized bed and reaction apparatus thereof, belongs to petrochemical industry technique field. The technics comprises three main steps of reforming methane with steam, oxidating catalyst for removing carbon deposit and reducing and regenerating catalyst, the whole process combines selfrecharging of reaction heat with catalyst regeneration to reduce energy consumption and increase productivity of hydrogen; the invention utilizes combination of endothermic and exothermic and reaction combination of reduction of metal oxide and metal oxidizing reaction, uses catalyst solid particles as carrier of heat and oxygen to realize binary cycle of heat and oxygen; main reaction apparatus of the technics comprises: a riser reactor for reforming methane with steam, a fluidized bed combustion reactor for removing catalyst oxidation and carbon deposit, and a catalyst regeneration device; whole apparatus of the invention have simple and compact structure.

Description

technical field [0001] The invention relates to a circulating fluidized bed methane steam reforming hydrogen production reaction process and a reaction device, which belong to the technical field of petrochemical industry. Background technique [0002] Steam reforming of methane has been applied for the first time since 1926 [Satterfield C.N., Heterogeneous Catalysis in Industrial Practice. New York: McGraw-Hill, 1991]. Hydrogen is the most widely used method. The traditional methane steam reforming process includes: preheating and pretreatment of raw materials, steam reforming, high and low temperature conversion of carbon monoxide, waste heat recovery, and hydrogen purification. The core is the reformer. [0003] The steam reforming reaction of methane is a strong endothermic reaction, which needs to be carried out at high temperature, 750℃~900℃. At the same time, in order to improve the conversion rate, the pressure must be increased. The reaction condition is 1.5~3MPa, ...

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Problems solved by technology

[0006] Disadvantages of the traditional process: Since the currently used catalysts usually require excessive water vapor to inhibit the deposition of carbon on the surface of the catalyst, H in the general feed gas 2 O and CH 4 The molar ratio is 3 to 5, resulting in high energy consumption for the reaction. In addition, the reaction needs to be carried out in a reactor made of expensive high-temperature-resistant stainless steel tubes, resulting in high equipment costs.

Considering that the application of hydrogen is becoming more and more extensive, especially in the future energy field, the market demand will increase sharply, and the hydrogen production process technology of steam reforming of methane cannot meet the requirements of large-scale hydrogen production in the future, so there is an urgent need develop new processes

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