56 / 2023-05-15 22:07:06

Study on the influence law of secondary dynamic titration flow rate of dust suppressan

Dust, secondary dynamic mixing, titration flow, dust reduction effect

High methane coal mines are characterized by high respiratory dust and high gas content, which can easily cause pneumoconiosis and gas explosion. At present, dust suppressant used to reduce dust concentration has been widely used in various industries, however, the dust suppressant dust reduction effect is affected by the titration flow of dust suppressant, so it is necessary to carry out research on the influence law of titration flow, optimize the structure of dust suppressant mixing device, improve the mixing uniformity and dust reduction efficiency of dust suppressant mixing device, and improve the working environment of underground personnel. In this paper, by using the titration mixing method of dust suppressant mixing device, the principle of hydration is used to achieve the pre-mixing and secondary dynamic mixing function of the new dust suppressant mixing device, and the capacity of the traditional single direct mixing device is reduced by 90%. Through the dust suppressant premixed solution level - titration flow experiments, dust suppressant premixed solution level - average titration flow correspondence curve, and then the initial selection of 0.8%  and 1% concentration as the premixed dust suppressant   mixing device premixed concentration. Through the premixed dust suppressant concentration - actual average titration flow rate relationship experiment, to get the dust suppressant concentration and flow rate maximum minimum relationship, and determine the 1% concentration of dust suppressant as premixed solution titration concentration. Through theoretical titration flow - actual valve diameter relationship experiment, get 1% premixed concentration of dust suppressant average flow rate and valve diameter relationship, and determine the 1% concentration of premixed dust suppressant solution corresponding valve diameter should be 3 mm. through the valve structure of the titration flow relationship experiment, get the valve opening angle and flow rate relationship and valve flow rate and liquid surface height relationship, and finally determine the small diameter ball valve opening angle of 62.5 ° ,and the initial liquid level of dust suppressant premixed solution is 29.7cm, which can meet the requirement of titration flow rate of 6.87ml/s in this study. The use of SolidWorks software to build a premix box, mixing stirrer, water inlet, titration port and liquid level window structure, size 500mm × 500mm × 320mm premix box, build by the container, titration port, liquid level window and dust suppressant spray solution outlet composed of 500mm × 500mm × 80mm mixing box. By building a simulated dust reduction experiment platform, the four control experiments of natural deposition of coal dust, water spray dust reduction, dust suppressant direct mixing dust reduction and new dust suppressant mixing device dust reduction were conducted, and the dust reduction efficiency of the four dust reduction methods within 30 min was 84.01%, 88.44%, 92.17% and 95.54%, and the dust reduction efficiency of new dust suppressant mixing device dust reduction was higher than that of natural deposition, water spray dust reduction and dust suppressant direct mixing. The dust reduction efficiency of the new dust suppressant mixing device controlled by titration flow rate is 11.53%, 7.10% and 3.37% higher than that of the other three dust reduction methods.. Ultimately by the dust suppressant secondary dynamic titration flow influence law research, to achieve the dust suppressant secondary uniform mixture of efficient dust reduction device development.