Method for producing hydrogen by light hydrocarbon primary steam reforming with heat exchange pre-reforming

A pre-reforming, steam technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., to reduce exhaust emissions and save hydrogen production costs

Active Publication Date: 2014-11-19
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above technical and economical problems of hydrogen production, the present invention provides a method for hydrogen production by one-stage steam reforming of light hydrocarbons with heat exchange pre-reformation, which reduces the consumption of more and more expensive light hydrocarbons in the hydrogen production process of light hydrocarbon conversion, At the same time reduce or cancel the external supply of by-product water vapor to reduce the cost of hydrogen production

Method used

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  • Method for producing hydrogen by light hydrocarbon primary steam reforming with heat exchange pre-reforming

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Embodiment 1

[0028] A first-stage steam reforming method for hydrogen production of light hydrocarbons with heat exchange and pre-reformation, comprising light hydrocarbons as raw materials, steam as oxidizing medium for light hydrocarbon conversion, heat-exchange pre-reforming furnaces, and first-stage steam reforming furnaces, among which the first-stage steam reforming furnaces Including convection section and radiation section, it is characterized by the following steps:

[0029] (1) Light hydrocarbons and steam enter the convection section of the first steam reformer for preheating, and the preheating temperature is 500-650℃;

[0030] (2) The preheated mixed gas A enters the heat-exchange pre-reforming furnace for pre-reforming reaction to obtain gas B. The pre-conversion rate of total hydrocarbon carbon is 10-50%;

[0031] (3) Gas B enters the radiant section of the first steam reformer for deep conversion reaction, and gas C is obtained. The conversion temperature at the outlet of the rad...

Embodiment 2

[0037] The hydrogen production method of natural gas first-stage steam reforming with heat exchange and pre-reformation includes the following steps:

[0038] The natural gas and steam are preheated to 530℃ in the convection section of the first steam reformer.

[0039] The preheated raw material mixed gas A (natural gas + steam) enters the heat exchange pre-reforming furnace, and the pre-reforming reaction is carried out under the action of the reforming catalyst. The pre-conversion rate of total hydrocarbon carbon in the imported raw materials is about 18%.

[0040] The heat exchange pre-reforming furnace is a vertical shell-and-tube type, with a reforming catalyst inside the tube to pre-reform the preheated raw material mixture A (light hydrocarbons + steam); a section of the steam reformer exits the high-temperature section of the tube outside the tube Gas is responsible for providing heat for the pre-conversion reaction in the tube.

[0041] The pre-reformed gas B at the o...

Embodiment 3

[0046] The hydrogen production method with heat exchange and pre-reformation of refinery dry gas first-stage steam reforming method includes the following steps:

[0047] Steam and desulfurized refinery dry gas are preheated to 530°C in the convection section of a steam reformer.

[0048] The preheated raw material mixed gas A (dry gas from the refinery + steam) enters the heat exchange pre-reformer and undergoes a pre-reformation reaction under the action of the reforming catalyst. The pre-conversion rate of total hydrocarbon carbon in the imported feedstock is about 24% .

[0049] The heat exchange pre-reforming furnace is a series of casing pipes, with reforming catalyst in the tube, pre-reforming the pre-heated raw material mixture A (dry gas from the refinery + steam); inside the casing jacket is a section of the steam reforming furnace outlet The high-temperature one-stage reforming gas is responsible for providing heat for the pre-reforming reaction in the tube.

[0050] ...

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Abstract

The invention belongs to the field of hydrogen production and in particular relates to a method for producing hydrogen by using light hydrocarbons as raw materials and adopting a light hydrocarbon primary steam reforming technology with heat exchange pre-reforming. The method is characterized by comprising the following steps: introducing a heat exchange type pre-reforming furnace, providing part of heat for reforming reaction by sensible heat of high-temperature reforming gas at the outlet of a primary steam reforming furnace, instead of part of fuel gas, and pre-reforming mixed raw material gas before entering the primary steam reforming furnace, so that a large amount of fuel required for the primary steam reforming furnace and a large amount of byproduct steam of a reforming gas waste heat boiler and a flue gas waste heat boiler at the convection section of the primary steam reforming furnace can be reduced, and the purposes of reducing the light hydrocarbon raw material and fuel consumption and the hydrogen production cost in a hydrogen production process can be achieved. Compared with a conventional method for producing hydrogen by the light hydrocarbon primary steam reforming technology, the method provided by the invention has the characteristics that the total light hydrocarbon consumption (raw materials and replenished fuel) can be reduced by about 7%-15%; at present, the price of light hydrocarbons is increasingly raised, the hydrogen production cost can be greatly reduced and the discharge of waste gas is reduced.

Description

technical field [0001] The invention belongs to the field of hydrogen production, and in particular relates to a method for producing hydrogen by using light hydrocarbons as raw materials and adopting a one-stage steam reforming technology of light hydrocarbons with heat exchange pre-reformation. [0002] Background technique [0003] To produce hydrogen from light hydrocarbons such as natural gas, refinery dry gas, oilfield associated gas, coke oven gas, dry distillation gas, naphtha, etc., it is first necessary to convert the light hydrocarbons into H-rich 2 The reformed gas, and then use gas separation methods, such as pressure swing adsorption separation method and freezing separation method, to achieve the purpose of producing hydrogen. [0004] The existing hydrogen production from light hydrocarbon conversion generally adopts a one-stage steam reforming method to produce reformed gas. 2 O reaction transforms into H 2 and CO 2 , and finally use the gas separation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/34
CPCY02P20/129
Inventor 王良辉
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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