A low-pressure flash pyrolysis flow tube reaction device based on a continuous molecular beam source

Abstract

The invention belongs to the technical field of pyrolysis instruments, in particular to a low-pressure flash pyrolysis flow tube reaction device based on a continuous molecular beam source. It includes a test bench, an installation mechanism, a flash pyrolysis mechanism and a vacuum box; the flash pyrolysis mechanism includes a cylindrical cavity horizontally arranged in the vacuum box, and a sample injection pipe, a water inlet pipe and a water outlet pipe arranged in the cylindrical cavity, and a water cooling chamber It is slidably arranged in the cavity at the other end of the cylindrical cavity, the other end of the injection tube penetrates the water cooling cavity, and the extension end is connected with a silicon carbide tube, and a pair of graphite electrodes is sleeved on the silicon carbide tube; the extension end of the push rod of the linear introducer A sliding table is arranged in the corresponding cylindrical cavity, the extension end of the push rod is fixedly connected with the sliding block, and the upper end of the sliding block is fixedly connected with the corresponding sampling tube. The silicon carbide tube of the invention is used as a reactor, and the graphite electrode is heated to realize rapid temperature rise and reduce secondary reactions, and can reduce the annihilation of active and important reaction intermediates such as free radicals under low pressure, and can realize continuous sampling and improve the reaction power of pyrolysis samples. study research.

Description

technical field [0001] The invention belongs to the technical field of pyrolysis reactors, and in particular relates to a low-pressure flash pyrolysis flow tube reaction device based on a continuous molecular beam source. Background technique [0002] In the current scientific research experiments, various reaction devices and equipment emerge in an endless stream, and a large number of experiments provide a broad data base for the development and verification of reaction kinetics. Pyrolysis reaction is the first stage of high temperature combustion, and it is a key process to explore the decomposition path of fuel and other samples in the initial stage. [0003] The current pyrolysis reactor mainly has the following problems: [0004] (1) The pyrolysis reaction cannot be carried out in a relatively high vacuum environment, and most active intermediate products such as free radicals are easily annihilated under normal pressure or high pressure, and cannot be observed; [0...

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Problems solved by technology

[0004] (1) The pyrolysis reaction cannot be carried out in a relatively high vacuum environment, and most active intermediate products such as free radicals are easily annihilated under normal pressure or high pressure and cannot be observed;

[0005] (2) Slow pyrolysis reaction device, the pyrolysis reaction is slow, secondary reactions are prone to occur, and the reaction intermediates cannot be accurately captured, that is, the reaction network cannot be accurately given;

[0006] (3) Discontinuous sampling, unable to conduct continuous sampling research by coupling molecular beam sampling system and photoionization mass spectrometry, which greatly increases the experimental period and error;

[0007] (4) The material of the reactor is mostly not up to the higher temperature range. There are many species that have a higher boiling point. The temperature requirement for complete decomposition of the species parent

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