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Tube-tube type plasma reactor for preparing hydrogen through ammonia decomposition

A tubular reactor and plasma technology, applied in the fields of ion chemistry and hydrogen energy, can solve the problems of different temperature sensitivity, the reduction of gas-phase plasma ammonia decomposition conversion rate, etc. rate increase effect

Inactive Publication Date: 2015-07-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, different discharge forms will cause ammonia to produce different free radicals and active particles, and the difference in active particles will lead to different sensitivity of the entire reaction to temperature. In arc discharge plasma, the temperature rise will lead to the decomposition of ammonia in the gas phase plasma. conversion rate drop

Method used

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  • Tube-tube type plasma reactor for preparing hydrogen through ammonia decomposition

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Comparison scheme
Effect test

Embodiment 1

[0030] Lead anhydrous liquid ammonia from the storage tank through the pressure reducing valve, control the flow meter and regulating valve to make the ammonia flow rate reach 40 ml / min, and use the metal tube grounding electrode 1 as the air inlet (Figure 1) to send it into the tube- Tubular Electrode Catalytic Plasma Reactor. The metal tube discharge electrodes 1 and 5 of the reactor are made of ordinary stainless steel with a diameter of 3 mm, and the insulating sealing device 4 between it and the reactor shell is made of polytetrafluoroethylene material, and the distance between the two metal electrodes is 4 mm. The shell 2 is made of quartz material, with an outer diameter of 12 mm and an inner diameter of 10 mm. The thermal insulation material 3 outside the housing adopts asbestos. Ammonia gas enters the reactor through the feed port 1, and the reacted gas flows out of the reactor through the cracked gas outlet 5. After the flow of ammonia gas in the reactor is stabili...

Embodiment 2

[0032] Example 1 was repeated, but the discharge parameters were set as follows: the initial voltage of the transformer was 65 volts, and the discharge frequency was 5 kHz. Then the power of the high-voltage power supply reaches 21 watts, the actual discharge voltage is 4.2 kV, the temperature of the reactor is stabilized at 657°C after the reaction is stable, and the ammonia decomposition conversion rate reaches 98%.

Embodiment 3

[0034] Example 1 was repeated, but the discharge parameters were set as follows: the initial voltage of the transformer was 76 volts, and the discharge frequency was 9 kHz. Then the power of the high-voltage power supply reaches 21 watts, the actual discharge voltage is 4.5 kV, the temperature of the reactor is stabilized at 618°C after the reaction is stable, and the ammonia decomposition conversion rate reaches 83%.

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Abstract

The invention belongs to the technical field of plasma chemistry and hydrogen energy, and relates to a tube-tube type plasma reactor for preparing hydrogen through ammonia decomposition. The tube-tube type plasma reactor is characterized in that two metal tubes used by the reactor are respectively a high-pressure electrode and a grounding electrode, one is used as an ammonia feed port, the other is used as a product discharge port, at least one metal tube comprises the material containing metal element catalyzing ammonia decomposition activity, and a thermal insulation layer is arranged outside the shell of the reactor. The tube-tube type plasma reactor has the beneficial effects that ammonia is decomposed in the plasma reactor through combined action of air phase plasma decomposition reaction and electrode surface catalyzed reaction, a tubular electrode is used for forcing ammonia to pass through a plasma discharge area and the internal surface of the electrode, so that the energy usage ratio is improved, the bulk temperature of the interior of the reactor and the temperature of the electrode are improved by the thermal insulation layer, the capacity of the surface of the electrode in catalyzing ammonia decomposition is improved, and the ammonia conversion efficiency is further improved.

Description

technical field [0001] The invention belongs to the technical fields of plasma chemistry and hydrogen energy, and relates to a new method for hydrogen production by plasma ammonia gas decomposition. Background technique [0002] In recent years, ammonia has been increasingly regarded as an ideal non-carbon-based hydrogen source. Using ammonia to produce hydrogen has the following advantages: (1) The energy density of ammonia is high (the maximum specific energy of ammonia cracking gas is 5.59KWh / Kg, and the maximum specific energy of methanol steam reforming gas is 3.8KWh / Kg); (2 ) High degree of greening (there is only H in the ammonia cracking gas 2 and N 2 , so that the fuel cell does not emit greenhouse gases); (3) the fuel load is light (1Kg H 2 Consumption of 5.67Kg ammonia. However, steam reforming of methanol consumes 5.17Kg of methanol and 3.0Kg of water, and the fuel load is 44% higher than that of ammonia cracking); (4) Ammonia can be liquefied when the pressu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/08C01B3/04
CPCY02E60/36
Inventor 郭洪臣赵越王丽
Owner DALIAN UNIV OF TECH