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A nitrogen oxide generation system

A technology of nitrogen oxides and generating systems, applied in nitrogen compounds, gas generating devices, chemical/physical processes, etc., can solve problems such as corrosion of devices and pipelines, serious problems, difficulty in long-term stable operation of devices, etc., and achieve full utilization of raw materials , the effect of reducing waste

Active Publication Date: 2021-11-02
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
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  • 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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  • A nitrogen oxide generation system
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Establishment figure 1 , figure 2 The nitrogen oxide generated system shown, wherein the nitrogen oxide generator 7 has a diameter of 200 mm, length 1450mm, a total of 7-level plate, and an external design of an electric heating belt, a material liquid inlet and an exit flange, and air drums in each stage .

[0049] A nitrogen oxide preparation experiment was carried out based on the established nitrogen oxide generated system. The resulting nitrogen oxide was analyzed by a nitrogen oxide concentration analysis system, and the prepared nitrogen oxide finally was absorbed with sodium hydroxide saturated solution.

[0050] The nitrogen oxide generating system operation process conditions:

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

[0052] First, heating nitric acid, sodium nitrite, and nitrogen oxide generators to 70 ° C, and then simultaneously open the two binders and compressed air feeds. The react...

Embodiment 2

[0058] The nitrogen oxide generating system is in Example 1.

[0059] The nitrogen oxide generating system operation process conditions:

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

[0061] First, the nitric acid, nitrite solution and nitrogen oxide generator are first heated to 70 ° C, and then simultaneously open the two branches and compressed air feed, and the reflective fluid flows to the sodium nitrate solution collecting tank 14, resulting nitrogen oxidation The material gas is stored until the supercharged pump is boosted to a nitrogen oxide gas buffer tank 11. The pressure of the buffer tank gradually increases. When the buffer tank pressure is increased to 0.15 MPa (this value can be set by itself), the nitrogen oxide outlet valve is started, and the nitrogen oxide gas is discharged, the discharged nitrogen oxide gas is buffered. After absorption of sodium hydroxide solution. When the pressure of ...

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Abstract

The invention belongs to the technical field of nuclear fuel reprocessing, and relates to a nitrogen oxide generation system. The generating system includes 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 various flow line. The nitrogen oxide generation system of the present invention can continuously and steadily produce nitrogen oxide gas with a certain concentration (1-99v / v%).

Description

Technical field [0001] The present invention belongs to the technical field of nuclear fuel treatment, and is related to a nitrogen oxide generating system. Background technique [0002] At present, the preparation method of nitrogen oxides mainly has the following: [0003] (1) Liquid N 2 O 4 Law [0004] Liquid N 2 O 4 As a raw material, a nitrogen oxide gas is converted through heated gas. The advantage of this method is that the reagent is simple, only needs to be used by the heating gas carrier belt; the disadvantage is that liquid N 2 O 4 There is uncertainty, and it is stored, and the transportation related procedures is more complicated. Transportation requires special transport tank cars, only one in the country. [0005] (2) Concentrated nitric acid [0006] The concentrated nitric acid was heated to 400-600 ° C to decompose the nitrogen oxide gas. The advantage of this method is that the process is simple, the reagent is simple, and the disadvantage is that the thermal...

Claims

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Application Information

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Patent Type & Authority Patents(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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