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

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...

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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

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