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A system and method for measuring ignition temperature of particle-containing airflow

An ignition temperature and particle technology, which is used in the field of systems for measuring the ignition characteristics of airflow, and achieves a wide range of effects.

Active Publication Date: 2017-11-07
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current experimental methods for stagnant flow field are mainly used for gas-phase homogeneous ignition and combustion tests, but there is no method for heterogeneous particle-containing gas flow ignition

Method used

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  • A system and method for measuring ignition temperature of particle-containing airflow
  • A system and method for measuring ignition temperature of particle-containing airflow
  • A system and method for measuring ignition temperature of particle-containing airflow

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Embodiment

[0034] Example: such as figure 1 As shown, a system for measuring the ignition temperature of air flow containing particles, the system includes a particle generating device (2), a gas preheating nozzle assembly, an air flow nozzle assembly containing particles, a pressure chamber (18), a thermocouple (16), an imaging device (20) and speed measuring device (21).

[0035] The gas preheating nozzle assembly includes a first-stage heating device (3), an upper nozzle gas inlet (4), an upper nozzle protective gas inlet (5), a water-cooled shell (6), an upper nozzle (7) and a second-stage heating device ( 8); the upper nozzle (7) is a double-layer concentric structure nozzle, including an inner wall and an outer wall, the inner wall is a central channel, and an outer layer channel is formed between the inner wall and the outer wall; the first stage heating device (3) is installed on the upper nozzle Inside the inner wall of (7), the second-stage heating device (8) is installed arou...

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Abstract

The invention provides a system and method for measuring the ignition temperature of air flow containing particles, wherein the measurement system includes a particle generating device, a gas preheating nozzle assembly, an air flow nozzle assembly containing particles, a pressure chamber, an imaging device, and a speed measuring device; the measurement method includes a gas There are three parts: warm-up hedging, quasi-steady-state heating and visual analysis. The principle of the device is: a uniform particle-containing airflow is formed through the particle generator, and a particle-containing airflow with different particle concentrations is generated by adjusting the powder feeding amount. Two jet nozzles arranged oppositely form a hedging structure, and a heating device is arranged in the upper nozzle. , Arrange the rotating vane and the equalizing plate inside the lower nozzle to carry out secondary dispersion of the solid particles in the airflow, and shape the airflow velocity distribution, so that the nozzle outlet can obtain a symmetrically distributed particle-containing airflow and form a stagnant flow field. The device and method of the invention can generate and measure the ignition temperature of a uniform particle-containing airflow, and are widely used in scientific research and production practice in the fields of energy, environmental protection, chemical industry, metallurgy, pharmacy, biology and the like.

Description

technical field [0001] The present invention relates to a system and method for measuring the ignition characteristics of airflow, specifically a system and method for measuring the ignition temperature of airflow containing particles, which uses the advantages of pure one-dimensional characteristics and controllable elongation rate of opposing jet flow to visually measure the ignition temperature of airflow containing particles. Ignition characteristics of particulate airflow in extensional flow field. Background technique [0002] The common methods currently used to study the ignition characteristics of particle-laden flow, especially pulverized coal flow, include drop tube furnace method (DTF), thermogravimetric analysis (TGA), wire mesh reactor method, and laser heating reactor method , flat flame burner method, etc. These methods all place the particle-containing gas flow particles in a flow field condition that is homogeneous, unstretched or uncontrollable, and diffi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/50
Inventor 吴宁李水清姚强
Owner TSINGHUA UNIV
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