The Development And Application Of Colloid–inhibition–foam Fire Prevention Devices In Spontaneous Combustion Of Coal

Coal energy system of the main body status in our country, the rapid development of economy in our country and coal matter, and in the future for a long time, the status of the coal body energy will not change. In the process of the development of the industry in the future, the coal is an important support of energy will be more and more important role. With the grows of coal mining scale, the deepening of mining depth, the coal spontaneous combustion occurred frequently, seriously affecting the life safety of the coal mine workers, restricts the economic development of the enterprise.Coal mined-out area there are a lot of, and have a constant air leakage, and in turn provide oxygen, the mined-out area, good heat storage environment, gob area is larger, the spontaneous combustion "three zones" in dynamic movement, wide range of high temperature, high temperature point is more covert, spontaneous, if the affected area is large, the difficulty of the fire. The current coal spontaneous combustion prevention and control technology is mainly to reduce temperature, such as irrigation, grouting, pressure injection gel, betting three-phase foam, etc.) and the inert gas injection(wound nitrogen and carbon dioxide injection, etc.), these techniques in the fire prevention and control of coal mine goaf low close space effect is obvious, but for long distance high of mined-out area of fire prevention and control of the effect not beautiful. Coal spontaneous combustion in goaf internal easy, the environment is complex in the mined-out area, the area is large, the point of ignition is hidden, fire location is difficult to determine, the general fire prevention materials can’t be widespread in filling, sex differences and accumulation, the gob fire control effect is poorer. Therefore put forward colloid inhibition foam fire protection technology, developed the colloid inhibition bubbles preparation device, it is a good way to make a goaf oxygen reduction, inerting, plugging, and brought the inhibitor material to traces of the inhibitor of coal spontaneous combustion hidden area, over a long distance and easy accumulation and reach high mined-out area.On the basis of theoretical analysis, this paper designed two levels of foaming device, foaming device to select jet proportioner polymer gel inhibitor for liquid automatic proportioning, using fluid mechanics knowledge, through a large number of theoretical calculate and determine the proportion of jet mixer parts size, through the experiment of jet proportioner, choose suitable for gel preparation of inhibition bubble device jet proportioner and best supply pressure is 0.8MPa. Device of colloid inhibition bubble was prepared the industrial experiment, and determine the optimal working parameters. By temperature programmed experiments, analysis of coal samples before and after treatment were the colloid inhibition bubble oxygen consumption rate and index of gas concentration change. Using ANSYS numerical simulation software, the colloid, numerical simulation device of inhibition bubble and further to determine the working parameters, establishes the mathematical model suitable for the actual status of the mined-out area of colloid inhibition bubble flow in goaf are simulated. By application of 7309 working face in coal mine, determines the colloid inhibition during coal combustion foam fire-fighting technology and equipment parameters, achieved good effect, play out of the colloid fire extinguishing effect of inhibition bubbles.