Mass loss rate-based combustible liquid heat release rate testing system

Abstract

The invention discloses a mass loss rate-based combustible liquid heat release rate testing system, and belongs to the field of testing systems used for determining combustible matter heat release rate in fire disaster developing processes. According to the mass loss rate-based combustible liquid heat release rate testing system, a thermal insulation exhaust fume collecting hood and a natural-type discharge flue are arranged on the upper part of a steel structured flame resistant glass restricted space; the center of the steel structured flame resistant glass restricted space is provided with a pool fire combustion platform which is arranged on a recording balance with heat exposure protection; the recording balance with heat exposure protection is connected with a microcomputer via a mass change collector; a temperature measuring thermocouple tree is arranged on the steel structured flame resistant glass restricted space via penetrating, and is connected with the microcomputer via a temperature data collector; a flue gas sampling probe is arranged on the center line of the natural-type discharge flue, and is connected with the microcomputer via a flue gas component analyzer . Processing and assembling of unit modules of the mass loss rate-based combustible liquid heat release rate testing system are simple; using method and operation processes are simple; and the mass loss rate-based combustible liquid heat release rate testing system possesses certain practical significance and economic application value.

Description

technical field [0001] The invention relates to a test system for measuring the heat release rate of combustibles during the occurrence and development of a fire, in particular to a test system for the heat release rate of combustible liquids based on the mass loss rate. Background technique [0002] Carrying out scientific research on various types of fires is of great scientific significance for the subsequent effective prevention of similar fires and the reduction of casualties and property losses in fires. Usually, when describing a specific type of fire, some fire parameters are quoted, such as release Heat rate, fire growth rate and other measurable parameters related to fire are used to describe its characteristics. Among them, heat release rate is regarded as one of the important parameters to reflect fire scene and evaluate fire hazard in numerical simulation. [0003] The heat release rate refers to the value of the rate at which the flammable sample releases heat ...

AI Technical Summary

Problems solved by technology

Traditionally, the simplest test method for heat release rate is to directly measure the enthalpy of flue gas in an adiabatic environment with thermal hysteresis, but it is difficult to realize a real adiabatic device. Most of the heat release rate test methods currently used are based on the principle of oxygen consumption (combustion The proportional relationship between the mass of oxygen consumed and the heat released) test platform built, such as the well-known small-scale experimental platform cone calorimeter based on the ISO5660 standard and the full-scale measurement system based on the ISO 9705 standard; but based on the consumption The combustion chamber involved in the test platform built by the principle of oxygen adopts a simple heat insulation method, so the heat release rate obtained is obviously lower than the real value, and the ash content of combustibles will also have a greater impact on the results. More advanced designs It is to use a constant temperature instrument instead of the combustion chamber, and measure the heat release rate in an instrument that can maintain a constant temperature. This design will get better results, but the actual instrument is complex and expensive

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