Study on the Improvement of Methane Explosion Inhibition Effect by Ultrafine Water Mist Containing Methanotroph-inorganic Salt

ABSTRACT

The explosion of combustible gas is an urgent problem to be solved in production safety accidents. In this paper, the experiment of methanotroph degradation of CH₄ and the experiment of the water mist containing methanotroph-inorganic salt inhibiting the methane explosion were carried out respectively based on a self-designed and built semi-closed small-scale experimental platform. We studied different volumes of the water mist containing methanotroph-inorganic salt to inhibit 5%, 8%, 9.5%, 12%, 15% methane explosion, and analyzed the relationship between time and relevant experimental parameters such as flame structure, flame average propagation velocity, maximum explosion overpressure, and average pressure rise rate, etc. The result showed that the water mist containing methanotroph-inorganic salt had a quite restrain effect on the methane explosion. At the same time, for first spray, when the degradation time is constant, with the increase of spraying volume, the explosion suppression effect is better. And when the spraying volume remains the same, the longer the degradation time is, the better the explosion suppression effect. As for the secondary spray, when spraying volume remains the same, the explosion suppression effect under the condition of Degradation with spray + explosion suppression with spray is superior to that of direct explosion suppression, whose reason is that the first spray mainly plays the biodegradation role of methanotroph, while the secondary spray mainly plays the physicochemical synergistic explosion inhibition role of the water mist containing methanotroph-inorganic salt.

KEYWORDS:

• Methane explosion
• ultrafine water mist
• first spray
• secondary spray
• methanotroph-inorganic salt

Additional information

Funding

This work was financially supported by National Natural Science Foundation of China (51704041, 51574046), Jiangsu Natural Science Foundation (BK20140264, BK20150269), Jiangsu Province Postgraduate Research and Practice Innovation Project (KYCX20_2588), Changzhou University Funds (ZMF14020052, ZMF14020055).