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

A circulating fluidized bed and methane steam technology, applied in the petrochemical field, can solve the problems of high equipment cost, increased market demand, and high reaction energy consumption, and achieve the effects of high equipment cost, simple design structure and cost reduction.

Inactive Publication Date: 2007-10-17
TSINGHUA UNIV
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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-resistan...

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

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Embodiment 1

[0032] In the circulating fluidized bed methane steam reforming hydrogen production reactor shown in Figure 1, feed gas A at 400°C to 450°C and catalyst particles at a temperature of 850°C to 860°C are catalyzed in riser reactor 2 Reforming reaction, the molar flow rate ratio of water vapor and methane in feed gas A is 1.5, and the total volume flow rate is 9×10 4 m 3 / hr, the superficial gas velocity is 15m / s; the particle size of the catalyst particles is 0.06-0.10mm, and the density is 2200kg / m 3 , the circulation rate is about 700kg / s; the outlet temperature of the catalyst in the riser reactor 2 is 800°C to 810°C, and the methane conversion rate in the reforming process is greater than 95%; the first cyclone separator 3a with a separation efficiency of 98% is used; After leaving the first fluidized bed combustion reactor 5a, the temperature of the catalyst rises to 1190°C-1220°C, and then passes through the second fluidized bed reactor 5b to realize catalyst regeneration...

Embodiment 2

[0034] In the circulating fluidized bed methane steam reforming hydrogen production reactor shown in Figure 2, feed gas A at 400°C to 450°C and catalyst particles at a temperature of 850°C to 860°C are catalyzed in riser reactor 2 Reforming reaction, the molar flow rate ratio of water vapor and methane in feed gas A is 1.2, and the total volume flow rate is 7.9×10 4 m 3 / hr, the superficial gas velocity is 13.2m / s; the particle size of the catalyst particles is 0.06-0.10mm, and the density is 2200kg / m 3 , the circulation rate is about 620kg / s; the temperature of the catalyst at the outlet of the riser reactor 2 is 800°C to 805°C, and the methane conversion rate in the reforming process is greater than 95%; the first cyclone separator 3a with a separation efficiency of 98% is used; After the first fluidized bed combustion reactor 5a, the temperature of the catalyst is raised to 1170°C-1190°C, and then the catalyst is regenerated through the downcomer reactor 1. The regeneratio...

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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, ...

Claims

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Application Information

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IPC IPC(8): C01B3/44C01B3/34C01B3/50B01J23/755B01J21/04B01J23/90
CPCY02P20/52Y02P20/584
Inventor 程易王琦丁石金涌
Owner TSINGHUA UNIV
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