Preparation of gasification ash slag gel and its inhibitory performance to coal spontaneous combustion

Abstract

In view of the high cost of the gel fire-fighting technology in the field and the difficulty of large-scale use, the relatively cheap coal chemical solid waste gasification ash is used as the base material and hydroxypropyl methylcellulose gelling agent (HPMC) is added. Later, a new type of gasification ash gel material was prepared. Meanwhile, taking lignite as the research object, the coal spontaneous combustion retardant properties of CaCl2 inhibitor and gasification ash gel were compared and analyzed by temperature-programmed gas chromatography combined experiment and FTIR Fourier transform spectrometer. The results show that with the increase of coal temperature, the release concentrations of CO and C2H4 in the coal samples with the addition of CaCl2 inhibitor and gasification ash gel are significantly lower than those in the raw coal, and the CO inhibition rates reach 46% and 67.5% at 110 ℃, respectively; gasification ash gel can increase the oxygen activation energy of coal by 25.2% in the temperature range of 30 ℃ to 200 ℃; the gasification ash gel can reduce the content of C-O, C=C functional group, effectively inhibit the free radical chain reaction, and its inhibition effect is better.

Keywords

• gasification ash gel
• cacl2 inhibitor
• spontaneous combustion of coal
• indicator gas
• reactive functional groups
• fire-fighting