Nitrogen oxide generating system

A nitrogen oxide and generation system technology, applied in nitrogen compounds, gas generating devices, chemical/physical processes, etc., can solve the problems of difficult long-term stable operation of devices, corrosion of devices and pipelines, and serious problems, so as to make full use of raw materials , high safety, and the effect of reducing waste

Active Publication Date: 2020-12-08
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this method is that concentrated nitric acid can be directly decomposed to produce nitrogen oxides without additional reagents; the disadvantage is that the high temperature decomposition of concentrated nitric acid will cause serious corrosion to the device and pipeline, and it is difficult for the device to run stably for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] established as figure 1 , figure 2 In the nitrogen oxide generation system shown, the nitrogen oxide generator 7 has a diameter of 200mm and a length of 1450mm. There are 7 levels of baffles in total. The external design is an electric heating belt. The inlet and outlet of the material liquid are connected by flanges, and each level has an air blowing tube. .

[0049] Based on the established nitrogen oxide generation system, the nitrogen oxide preparation experiment was carried out. The nitrogen oxide produced was analyzed by the nitrogen oxide concentration analysis system, and the prepared nitrogen oxide was finally absorbed and treated with a saturated sodium hydroxide solution.

[0050] The operating process conditions of the nitrogen oxide generation system:

[0051] Nitric acid concentration 10mo / L, sodium nitrite concentration 4mol / L, air flow 4.2m 3 / h, the running time is 4h.

[0052] Firstly, the nitric acid, sodium nitrite solution and nitrogen oxide ge...

Embodiment 2

[0058] Nitrogen oxide generating system is the same as in Example 1.

[0059] The operating process conditions of the nitrogen oxide generation system:

[0060] Nitric acid concentration 12mo / L, sodium nitrite concentration 6mol / L, air flow 4.2m 3 / h, the running time is 4h.

[0061] Firstly, nitric acid, sodium nitrite solution and nitrogen oxide generator are heated to 70°C, and then two feed liquids and compressed air feed are opened at the same time, and the reacted feed liquid flows to the sodium nitrate solution collection tank 14, and the nitrogen oxide produced The nitrogen oxide gas buffer tank 11 stores the nitrogen oxide gas after being pressurized by the booster pump. The pressure of the buffer tank increases gradually. When the pressure of the buffer tank increases to 0.15MPa (this value can be set by yourself), the nitrogen oxide outlet valve starts to be opened to discharge the nitrogen oxide gas. The discharged nitrogen oxide gas passes through the buffer tan...

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Abstract

The invention belongs to the technical field of nuclear fuel post-treatment, and relates to a nitrogen oxide generation system. The generation system comprises a nitric acid liquid storage tank, a sodium nitrite liquid storage tank, a first pump, a second pump, a nitrogen oxide generator, a compressed air system, a nitrogen oxide gas buffer tank, a sodium nitrate solution collection tank and circulation pipelines. By means of the nitrogen oxide generation system, nitrogen oxide gas with a certain concentration (1-99v / v%) can be continuously and stably prepared.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel reprocessing, and relates to a nitrogen oxide generating system. Background technique [0002] At present, the preparation methods of nitrogen oxides mainly include the following two types: [0003] (1) Liquid N 2 o 4 Law [0004] liquid N 2 o 4 As a raw material, it is converted into nitrogen oxide gas by heating and gasification. The advantage of this method is that the reagent is easy to obtain, and it can be used only by heating and vaporizing the air; the disadvantage is that the liquid N 2 o 4 There is uncertainty in the supply, and the procedures related to storage and transportation are relatively complicated. The transportation requires a special tanker, and there is only one in the country. [0005] (2) Concentrated nitric acid pyrolysis method [0006] Heat concentrated nitric acid to 400-600°C to decompose it to obtain nitrogen oxide gas. The advantage of this method is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J7/02C01B21/20
CPCB01J7/02C01B21/20
Inventor 李高亮唐洪彬兰天刘金平常尚文李斌何辉叶国安
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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