Preparation Of Microcapsule Inhibitor Suspension Sludge And Its Pipe Transport Characteristics

In view of the existing microcapsule inhibitor agent in the defects existing in the actual use process,through the screening of wall and core material,compound with a new type of microcapsule inhibitor agent,studied the coal oxygen thermal dynamic characteristics,analyses its feasibility in the pipeline transport,developed the microcapsule inhibitor agent suspension slurry,improves the microcapsule inhibitor agent used in mine fire effect.Through Gaussian simulation and practical application,melatonin and magnesium chloride were selected,and the core material was made in a ratio of 1:4,and the core material was microencapsulated by mixing 70#chlorinated paraffin and 52#chlorinated paraffin in a ratio of 5:1.In the experiment of coal oxythermal kinetics,it was found that the prepared microcapsule inhibitor reached the expectation of releasing the core material at 70?,and the effect of inhibiting coal spontaneous combustion was the best.Its resistance rate reached the maximum at about 110?,0.72.It can be seen from the oxidation kinetics test that the microcapsule inhibitor can increase the temperature at the intersection of the coal sample by 31?,and the calculated coal spontaneous combustion tendency determination index I reaches 976.41,which is the best inhibition effect of the three inhibitors.Therefore,microcapsule inhibitors can be used in coal spontaneous combustion fires.The maximum pressure of the microcapsule inhibitor during pipeline transportation was determined by COMSOL simulation.Based on this,the compressive test was designed,and the retention of the core material of the microcapsule inhibitor after the experiment was determined as well as the thermal kinetic analysis of coal oxygen.It is determined that the microcapsule inhibitor needs to bear the pressure of17MPa in the pipeline transportation,and the wall shell is slightly damaged after the pressure,and the loss of core material decreases by 23%.However,according to the coal oxygen thermal kinetics experiment,the inhibition rate of coal is 0.71 at most,which is second only to the original microcapsule inhibitor.According to the analysis of coal spontaneous combustion tendency,the determination index of coal spontaneous combustion is only lower than the original microcapsule inhibitor,which is 903.18,which reduces the spontaneous combustion tendency of coal from easy to spontaneous combustion to spontaneous combustion.And according to the release law of coal sample CO,it can be seen that the microcapsule inhibitor after pressure achieves the effect of releasing the inhibitor at 70?.Therefore,the microcapsule inhibitor can be transported to the ignition point by pipeline to extinguish the fire and can be attached to the surface of the coal seam to inhibit the spontaneous combustion of coal.The surface tension of the foaming agent was analyzed by interfacial rheometer,and the surfactant was selected as the foaming agent in the experiment.The sample was prepared,the foam was made by foam scanner and the data were recorded.The initial foaming volume V0 of the solution and the time t_1/2 needed for the foam to decrease from the initial volume to half of the original volume were analyzed.The foaming capacity and foaming stability were characterized by these two data.Based on the above research,A1 and B1 were selected as the foaming agent of the slurry in a ratio of 1:1when manufacturing the microcapsule inhibitor suspended slurry.The concentration of the foaming agent was 0.2%,the ratio of the microcapsule inhibitor to water was controlled between 1:4?1:2,and the particle size of the microcapsule inhibitor was as small as possible.