Sample heating and post-cooling device for detecting propellant decomposition gas

A technology of cooling device and propellant, which is applied in the direction of measuring device, material separation, and analysis of materials, etc. It can solve the problems of accelerated decomposition reaction, long warm-up time, uneven temperature distribution of samples, etc.

Active Publication Date: 2021-07-06
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The preheating time of the sample is long. The propellant is a poor conductor of heat. In the early stage of heating, the temperature distribution of the sample in the tank is uneven. The samples close to the side wall and bottom of the sample tank reach 90°C faster, while the internal samples reach 90°C. It takes a long time. In order to ensure that the samples in the sample tank reach 90°C, it needs to be preheated for 30 minutes;
[0006] (2) The cooling time of the gas to be tested is long. After the sample tank is heated, it needs to be cooled for 30 minutes before the gas can be extracted with an airtight needle for detection.
[0007] (3) The repeatability of the test results is poor. In the middle and later stages of the thermal decomposition of the sample, since the propellant is a poor conductor of heat, heat accumulation will occur in the densely packed parts of the sample. This heat accumulation will further accelerate the decomposition reaction and correspondingly produce more decomposition. Due to the randomness of the contact between the sample particles when filling the sample tank, the detection data of the same sample will fluctuate greatly due to different filling states

Method used

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  • Sample heating and post-cooling device for detecting propellant decomposition gas
  • Sample heating and post-cooling device for detecting propellant decomposition gas
  • Sample heating and post-cooling device for detecting propellant decomposition gas

Examples

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Effect test

Embodiment 1

[0068] Use the device of the present invention to heat a certain batch of small propellants produced in 2017, and detect the CO in the pyrolysis gas 2 and NO 2 content.

[0069] A sample heating and post-cooling device for detecting propellant decomposition gas, characterized in that the device includes a tank body 1, a cap 2, a cooling pipe 3, a gas sampling port 4 and a heating furnace 5;

[0070] Such as figure 1 As shown, the tank body 1 is a revolving body, and the tank body 1 is composed of two parts, the inside and the outside. On the plane; the diameter of the heat conduction column is 2mm, the height is 60mm, and the heat conduction column is evenly distributed on the circle with a radius of 4mm from the center of the inner bottom plane of the cylinder; the wall thickness of the tank body 1 cylinder is 2mm, the outer diameter is 30mm, and the outer height is 82mm , the upper end of the outer surface of the barrel is the first external thread area, and the height o...

Embodiment 2

[0087] Prepare a batch of simulated stock propellants by aging in the laboratory: thermally age a batch of tubular propellants at 95°C, and confirm through the bromination method that the stabilizer content has been reduced by 80%, which is equivalent to the propellants that have been in stock for many years , the stabilizer is too small to be able to absorb NO in the decomposition gas 2 , using the present invention to detect CO in the pyrolysis gas of the simulated stockpile propellant sample 2 and NO 2 content.

[0088] Such as figure 2 As shown, a sample heating and post-cooling device for detecting propellant decomposition gas is characterized in that the device includes a tank body 1, a cap 2, a cooling pipe 3, a gas sampling port 4 and a heating furnace 5;

[0089] The tank body 1 is a revolving body, the tank body 1 is composed of two parts inside and outside, the outside of the tank body 1 is divided into a drum body, and the inside of the tank body 1 is divided i...

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Abstract

The invention discloses a sample heating and post-cooling device for detecting propellant decomposition gas. The sample heating and post-cooling device comprises a tank body, a cap, a cooling pipe, a gas production port and a heating furnace, the tank body is a barrel body, a heat conduction column is arranged in the tank body, the cap is provided with an air hole, and the cap and the tank body are assembled into the sample tank by tightening threads. The left end of the spring-shaped cooling pipe is connected with the air hole of the sample tank cap, and the right end of the cooling pipe is communicated with the sampling port. The sample tank filled with the propellant powder into a heating hole of a heating furnace, heating is performed at 90 DEG C for 3 hours, and gas in the sample tank is extracted for detection. Compared with an original device, the device disclosed by the invention has the advantages of uniform sample heating, high sample temperature rising speed, capability of rapidly cooling decomposition gas to be detected and the like, the precision of a detection result is improved, and the sample heating and post-cooling time is shortened.

Description

technical field [0001] The invention belongs to the field of quantitative detection of propellant thermal decomposition gas, mainly relates to a propellant sample heating and post-cooling device, in particular to a propellant sample rapid heating and decomposition gas rapid cooling device. Background technique [0002] Propellant is one of the energy sources for the launch of gun projectiles, and it plays a certain role in gun weapons. The propellant needs to be stored for a long time and must have stable performance. The stability performance of propellant is mainly chemical stability, which refers to the ability to delay decomposition and prevent automatic chemical changes during the storage period of propellant. Propellants contain nitrate compounds such as nitrocellulose, which contain nitrate groups, which can decompose slowly by themselves and release CO 2 , NO 2 and heat. NO 2 It has the function of self-catalyzing the decomposition reaction of propellant. On th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/86
CPCG01N30/02G01N30/06G01N30/8624G01N30/8631
Inventor 贾林张冬梅许志峰杜姣姣顾妍张林军
Owner XIAN MODERN CHEM RES INST
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