Study On Preparation And Generation Device Of Mine-used Fire Prevention And Extinguishing Organic Curing Foam

In view of the present insufficiency in the mine fire prevention and extinguishing technology and sealing materials, in order to effectively prevent and control mine fires, close fire zone, plugging the pores and crack in gob, prevent and control gas emission and accumulation, and extinguish mine fire quickly and efficiently, organic curing foam techniques and machine for mine fire prevention and extinguishing are proposed.Firstly, in order to work out the optimum preparation formula of organic foam, liquid resin, foaming agent, and the mass ratio of these two were studied respectively applying the orthogonal test, obtained: the molar equivalent ratio of liquid resin raw materials A1 and A2 was 1:1; foaming agent was comprised of soluble solid, who is easy to sublimate, and organic foaming agent; the mass ratio of liquid resin and foaming agent was 1:0.3. The research results showed that to maximize the adhesion of organic curing foam, one must jet the organic curing foam to the attachments surface when the foam multiple was 25. In order to work out the optimum curing time, the relationship between foam drainage volume and time was studied applying the analysis instrument of foam liquid membrane drainage, obtained: in the range of 5-30 min, foam liquid membrane mainly drained under the gravity; in the range 30-60min, foam liquid membrane drained under the action of the gravity and PB area surface pressure difference; after 60min, mainly for the PB zone surface pressure difference drain. The results showed that to obtain the best organic curing foam, organic foam crosslinking reaction must be carried out in 5min.Secondly, in order to work out the optimum combination of curing agent materials and catalysts, four kinds of curing agents and two types of catalysts were studied applying organic curing foam experimental system, obtained: curing agent raw materials A&B and foam liquid occurred propagating reaction, the foam viscosity rapidly largened until curing, it primarily acted on the gel reaction, the resulting foam cured evenly, with strong stability, but Curing Agent A produced gas with strong smell in the reaction; Curing Agent C&D responded slowly with the foam fluid, the foaming multiple was high, it primarily acted on the foaming reaction, but the product was brittle, with poor stability, the action time of Curing Agent D was too long. Tertiary amine catalysts could promote the foaming reaction and effectively balance the foaming reaction and gel reaction; metal organic compounds catalysts could rapidly promote gel reaction and cured, the foaming multiple was low, could not balance the foaming reaction and gel reaction. The research results showed the optimum curing agents combination of mine-used organic curing foam was B&C and tertiary amine catalysts.Thirdly, in order to develop a two-component organic curing foam foaming machine, the foaming agent nozzle, resin solution tube and foaming agent solution tube simultaneously formed angles of 30 o, 45 o and 60 o with-x axis at the entrance speed of 3 m/s, these three cases were studied applying Fluent simulation software, obtained: the maximum relative negative pressure value of the foam nozzle diffuser could form was 12200Pa, the place of the maximum negative pressure was 0.0025m far from the throat; the foaming effect of two-component organic curing foam was optimum when the resin solution tube and foaming agent solution tube were 60o with -x-axis. On the basis of the results, two-component organic curing foam negative pressure foam generating machine was designed. In order to develop the one-component organic curing foam packing system, the resin liquid raw materials and containers were studied, obtained: single-component organic curing foam prepolymer with unsaturation, since the prepolymer would occur curing reaction with the air, and the propellent would vaporize when into the air, etc, single-component organic curing foam packing system packing liquid resin, surfactant and propellent all in one was developed.Finally, experiment results showed the foaming multiples of the two-component foam and the one-component foam were respectively 32 times and 66 times; the surface drying time and the pragmatic drying time of two-component foam were respectively 7.3min and 78.3min, those of single-component foam were respectively 5.8min and 72.1min. Organic curing foam adhesion to the rock and coal was 2.1MPa; the flaming combustion time was 5s, and the flameless combustion time was 18s; the air leakage flow rate was 2×10-5m3/s when the pressure difference was 125Pa.