Experimental study on pyrolysis of black non-charring polymers in the reduced pressure environment

R. Zong^ab, R. Kang^a, Y. Zhi^c, Ch. Liu<sup>a

a</sup> State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230027, China
^b Suzhou Key Laboratory of Urban Public Safety, Suzhou Institute for Advanced Study, University of Science and Technology of China, Suzhou, 215123, China
^c School of Mechanical Engineering, Nanjing Institute of Technology, Nanjing, 211167, China

Abstract: A series of experiments on a black non-charring polymer in the low-pressure chamber is conducted under different external heat fluxes. The surface and bottom temperatures and the mass loss of the sample are measured. A parameter $T_p$ is introduced to describe the impact of pressure on the surface temperature. There is a loose layer of the char residue left with significant pyrolysis bubbles under the low heat flux, and the bubble size decreases with pressure. The parameter $T_p$ is found to exhibit a significant decline trend with increasing pressure, and the mass loss rate of the sample decreases apparently as the pressure increases. However, under a high heat flux, the char residue is denser, and the pyrolysis bubbles are not observed. The value of $T_p$ and the mass loss rate of the sample have no obvious relationship with pressure. The average pyrolysis rate is linearly proportional to $p^a$.

Keywords: reduced pressure, surface temperature, bottom temperature, mass loss rate, char residue.

UDC: 536.46+541.42

Received: 02.08.2017

DOI: 10.15372/FGV20180307

 English version: Combustion, Explosion and Shock Waves, 2018, 54:3, 309–315

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