Low-pressure flash pyrolysis flow tube reaction device based on continuous molecular beam source

Abstract

The invention belongs to the technical field of pyrolysis instruments, and particularly relates to a low-pressure flash pyrolysis flow tube reaction device based on a continuous molecular beam source. The device comprises a test bed, a mounting mechanism, a flash pyrolysis mechanism and a vacuum box; the flash pyrolysis mechanism comprises a cylindrical cavity horizontally arranged in the vacuum box, and a sample injection pipe, a water inlet pipe and a water outlet pipe which are arranged in the cylindrical cavity, the water cooling cavity is slidably arranged in a cavity body at the other end of the cylindrical cavity, the other end of the sample injection pipe penetrates through the water cooling cavity, the extending end of the sample injection pipe is connected with a silicon carbide pipe, and the silicon carbide pipe is sleeved with a pair of graphite electrodes; and a sliding table is arranged in the cylindrical cavity corresponding to the extension end of a push rod of the linear introducer, the extension end of the push rod is fixedly connected with a sliding block, and the upper end of the sliding block is fixedly connected with a corresponding sample injection pipe. The silicon carbide tube is used as a reactor, the graphite electrode is used for heating, rapid heating is achieved, secondary reaction is reduced, annihilation of active and important reaction intermediates such as free radicals can be reduced under low pressure, continuous sampling can be achieved, and reaction kinetics research of pyrolysis samples can be perfected.

Description

technical field [0001] The invention belongs to the technical field of pyrolysis reactors, in particular to a low-pressure flash pyrolysis flow tube reaction device based on a continuous molecular beam source. Background technique [0002] In various current scientific research experiments, various reaction devices and equipment emerge in endlessly, and a large number of experiments provide a broad data basis 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 reaction device 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; [0005] (2)...

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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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