Online hydrogen production method and equipment with methanol oxidation and steam reforming segmental combined

A methanol oxidation and water vapor technology, applied in chemical instruments and methods, hydrogen/syngas production, hydrogen and other directions, can solve the problems of inevitable local overheating and bed overheating, affecting hydrogen online production, poor thermal stability of catalysts, etc. , to achieve the effect of low cost, fast reaction start and high hydrogen concentration

Active Publication Date: 2016-10-12
DALIAN UNIV OF TECH
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  • Summary
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AI Technical Summary

Problems solved by technology

However, due to the poor thermal stability of existing catalysts, the temperature must be controlled below 300°C, otherwise thermal deactivation will occur
In the process of catalytic oxidation reforming, the exothermic heat of the oxidation reaction directly leads to the inevitable local overheating of the catalyst and the overheating of the bed layer, resulting in the thermal deactivation of the catalyst, which instead affects the online production of hydrogen.

Method used

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  • Online hydrogen production method and equipment with methanol oxidation and steam reforming segmental combined

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Equipment used such as figure 1 As shown: there is a stainless steel cylindrical reactor 1, and the outer side of the cylindrical reactor 1 has an insulating layer 2 to insulate the cylindrical reactor 1. The top of the cylindrical reactor 1 has a ceramic insulating cover 3, which is in phase with the high-voltage power supply 4. The connected discharge electrode 5 (sliding arc discharge high-voltage electrode) vertically passes through the axis of the cover 3, and a section of gas inlet 6 is provided on the cylindrical reactor 1 above the end of the discharge electrode 5, and a gas inlet 6 is provided in the cylindrical reactor 1. Catalyst bed 8 is arranged, and the distance between described discharge electrode 5 ends and catalyst bed 8 is 8 cm, is provided with the second stage gas between discharge electrode 5 ends and catalyst bed 8 on cylinder reactor 1 Inlet 7, below the catalyst bed 8 is a gas outlet 9. The high-voltage power supply 4 can be a DC high-voltage p...

Embodiment 2

[0033] Equipment used such as figure 1 As shown, except that the distance between the end of the discharge electrode 5 and the catalyst bed 8 is 15 cm, the other structures are the same as those in Example 1. What this embodiment 2 adopted is commercial copper-based catalyst (Cu / ZnO / Al 2 o 3 ), the space velocity is 8000 ml / g h.

[0034] The method is to follow the steps as follows:

[0035] a. Mix water and methanol at a molar ratio of 0.5:1, vaporize or atomize to obtain methanol and water mixed steam A, mix methanol and water mixed steam A with air to obtain a mixed gas, in which methanol and water The molar ratio of oxygen is 1:0.3;

[0036] b. Make the resulting mixed gas tangentially enter the reactor 1 through a section of gas inlet 6 to carry out the sliding arc discharge plasma oxidation reforming reaction to obtain the reforming hot gas, and the specific energy input of the plasma (the ratio of the input power to the total flow rate of methanol ) is 0.34 kW: 1kg...

Embodiment 3

[0049] Equipment used such as figure 1 As shown, except that the distance between the end of the discharge electrode 5 and the catalyst bed 8 is 20 cm, the other structures are the same as those in Example 1. What this embodiment 3 adopted is commercial copper-based catalyst (Cu / ZnO / Al 2 o 3 ), the space velocity is 6000 ml / g h.

[0050] The method is to follow the steps as follows:

[0051] a. Mix water and methanol at a molar ratio of 0.5:1, vaporize or atomize to obtain methanol and water mixed steam A, mix methanol and water mixed steam A with air to obtain a mixed gas, and in the mixed gas, methanol and The molar ratio of oxygen is 1:0.3;

[0052] b. Make the resulting mixed gas tangentially enter the reactor 1 through a section of gas inlet 6 to carry out the sliding arc discharge plasma oxidation reforming reaction to obtain reforming hot gas, and the specific energy input of the plasma (the ratio of the input power to the total flow rate of methanol ) is 0.44 kW: ...

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Abstract

The invention discloses an online hydrogen production method and equipment with methanol oxidation and steam reforming segmental combined. The method includes the steps that methanol oxidation reforming and steam catalytic reforming are segmentally combined, the first segment is methanol plasma oxidation reforming reaction, released heat serves as a heat source of steam catalytic reforming in the second segment, external heat supply is not needed, and the equipment is simple in structure. The problems that in existing conventional catalysis technology, reaction starting is slow, the output rate is small, cost is high, and a catalyst is deactivated are solved. The method has the advantages that reaction starting is fast, the output rate is large and cost is low, is suitable for producing hydrogen online for fuel cells and is particularly suitable for producing hydrogen online for fuel cells in vehicles, ships and other transportation means.

Description

technical field [0001] The invention relates to an on-line hydrogen production method and equipment, in particular to an on-line hydrogen production method and equipment combining methanol oxidation and steam reforming in stages with fast reaction start-up, high hydrogen concentration and low cost. Background technique [0002] Hydrogen is a renewable and clean energy that can directly convert chemical energy into electrical energy in a green and efficient way through hydrogen fuel cells, providing the required power for portable mobile devices, vehicles, and stationary power stations. On-line hydrogen production is to produce hydrogen through the chemical reaction of hydrogen-containing fuels (such as methanol and ethanol) at the site of use, realizing the immediate production and use of hydrogen, and solving the safety problems of flammability and explosion in hydrogen storage and transportation. . Since methanol is a liquid fuel that is easy to store and transport, has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/32
CPCC01B3/323C01B2203/0233
Inventor 朱爱民李小松刘景林朱晓兵连昊宇
Owner DALIAN UNIV OF TECH
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