System. The system includes a high-pressure gas source high-pressure water source mixer nozzle high-pressure water pipe and the like. Through experiments, the research determined the optimum aeration area of ​​the gas-liquid mixer of the foam dedusting agent and the type of nozzle. The installation test was carried out at the site. The results showed that the dust removal efficiency reached 93, and the dust removal efficiency of the respiratory dust reached 87, which had a good effect.
With the improvement of the mechanization degree of the roadway, the use of high-efficiency high-power roadheader transporter and local ventilation equipment will increase the dust production in the roadway, and the dust concentration in the air in the roadway will increase greatly. The main dust-producing sources in the roadway are the sub-discharge points of the transportation equipment for the excavation working face and the secondary dust of the dust on the peripheral wall of the roadway. Among them, the largest amount of dust is the driving face. The ship is scheduled to be inserted into the machine. The dust concentration is up to 1 and the next is the transfer point of the transport equipment. The dust concentration is also as high as 300,500%. The large amount of dust generated disperses the entire working surface and the roadway, so that the dust concentration in the roadway is seriously exceeded. These high-concentration and high-dispersion dusts seriously affect the health of the miners and threaten the safety of the mine to produce dust at a transfer point. Through the sealing, etc., the dust removal technology of the dust equipment can be better solved, and the excavation work surface is complicated due to the process state. Space is limited. The dust generated during the coal cutting process is not easy to control, so it needs to be based on the existing dust removal technology. Develop a new type of dust removal system. The new dust removal system needs to have the characteristics of low cost, low energy consumption, low operation, easy maintenance and repair, etc., in order to meet the complicated and difficult work fund project of the Ministry of Education, the special professional funded project of the Ministry of Education, Ding La, 53. Male. Hebei Zhao, the price of people.
surroundings.
Conventional spray watering and dust removal is simple and easy. However, the dust removal efficiency of respiratory dust is about 3, 5, 2 is not very satisfactory. Foam dust removal has the characteristics of simple structure, low cost, low water consumption and high efficiency of respirable dust removal. Therefore, foam dedusting technology is adopted. This paper will analyze the application effect of the foam dedusting agent dust removal system.
1Compressed air bubble, structure and working principle of dust removal system The foaming device used in this experiment is hydraulic ejector device, structure such as high pressure water pipe 1 system working principle high pressure compressed air enters gas-liquid mixer 5 through gas pipe 9, by The foam mixture provided by the water pump is discharged from the water pipe 7 into the mixer 5, and the bubble is concentrated in the mixer to be ejected through the nozzle of the outlet tube. Therefore, the dust removal work can be performed, and the system can be operated by the flow meter and the pressure. Engaged in research on mine safety.
1 adding liquid tank; 2 water pump; 3 filter; 4 filter sewage outlet; 5 gas-liquid mixer; 6 pump cable; 7 water valve; 8 gas valve; 9 gas pipe 10, quick joint; 10 nozzle; Knowing the flow rate of the foaming liquid and the pressure of the compressed air, the gas-liquid mixture can be adjusted through the foaming liquid control valve and the air tube control to produce foams with different properties. The compressed air foam dedusting system can be used for dust removal in different dust environments. The foam mixture in the dosing tank was experimentally determined.
2 Determination of structural parameters of gas-liquid mixer The mixer is the main place for gas-liquid mixing to produce foam. The design structure of the mixer directly affects the performance of the final dust-removing foam. The basic structure of the experimental design mixer. The laboratory uses a 0-electric tape conveyor type air compressor to provide high-pressure gas. When the system enters the mine, the high-pressure gas pipe in the mine can be directly connected to the gas-liquid mixer through the joint. The air compressor is only the simulation. Air power source.
When the foam liquid enters the special mixer through the water pump and is immersed in the aeration tube with a large number of small holes, under the aeration of the high pressure gas, a large amount of powder source generated by the cutting machine cutting and crushing the coal block may be generated. To achieve the purpose of dust reduction, the dust reduction effect on respiratory dust is good 1451.
1 intake pipe; 2 inlet pipe; 3 casing; 4 aeration pipe; 5 aeration pipe bracket; 6 foam outlet on the exposure of the product to the performance of the foam ah contrast research, design AB., group mixer, mixing The aeration tube added by the device is one, and the aeration tube added by the first version is similar. The aeration tube added by the mixer is 4, the aeration tube added by the mixer is 5 mixers with aeration area of ​​8 mixers, the aeration area of ​​the 3 mixer is 5 coffees of the mixer. The aeration area of ​​the mixer is that the 67 of the coupler is selected to produce a mixer with good foam performance, requiring a large expansion ratio, a long liquid discharge time, and a stable foam size.
The structure of the mixer is basically the same, and the input compressed air pipe has the same caliber, the difference is that the number of compressed air pipes input is different.
The mixer is a root snorkel. The distribution of small holes in the pipeline is 4 columns in the circumferential direction, 15 small holes with a diameter of 12 per column, and the total number of small holes is 60. The total number of small holes of the two vent pipes of the mixer 8 is 12, and the total number of small holes of the vent pipe is 240; the total number of small holes of the six vent pipes is 360, in the phase 1 The gas-liquid mixing parameter conditions were compared by comparing the expansion ratios. 25.0 liquid deposition time, 5, liquid separation time, the measurement results were recorded, and the structure of the mixer was determined.
The mixer with the smallest gas-liquid mixing area produces the shortest liquid-discharging time and the stability is relatively poor; the foaming time of the mixer can be relatively short compared to the mixer. The stability is relatively poor, indicating that it is within the range and conditions. The mixer has a large number of venting orifices, a large gas-liquid mixing area, and produces relatively good foam performance. The mixer and the mixer, by comparison, found that the foaming time of the foam produced by the mixer was relatively shorter than that of the mixer, and the stability was relatively poor, which indicated that the aeration area of ​​the mixer was not as large as possible, and the aeration tube was over. A large number of aeration holes can increase the aeration area, but too many small holes will also cause the airflow speed to decrease. The partial pressure reduction is not conducive to producing a foam of stable quality. Therefore, the mixer; the aeration hole and the aeration area are in a reasonable range, and the foaming time is the longest and the stability is relatively good.
3 nozzle selection design nozzles are the following two structures, the first nozzle is a fan-shaped duckbill nozzle, 3 through high-pressure external force processing, the foam liquid sprayed from the nozzle is a thin unfolded water curtain; the first nozzle is a fan-shaped distribution The nozzle type has a total of 9 sets of nozzles. The most basic nozzle component is a ferrule-type flat-head hex nut-shaped nozzle. It is easy to install and has a design function of anti-clogging. 4 The pressure in the mixer is adjusted under the same experimental conditions. The first type of nozzle and the first type of nozzle were separately installed for in-situ simulation experiments. By paying, the process consumes water and looks at it. Analysis of dust removal efficiency, etc., select a better nozzle. Two kinds of nozzles for different dispersion dust particle size 10 small to 4 compressed air bubbles, dust removal system field effect test 4. Compressed air foam dust removal system installed in the tunneling machine body, there is a suitable flat position at each box, can be placed Place and install a foam injection system including a water tank mixer high pressure line pump cable.
Connect the entire system to the design. If 6 does not. After the basic test is completed, the configured foam liquid is added to the water tank, and water is added to the position of the water tank water inlet. The water tank is filled with the water flow agitation, and the storage is full of the 1 roadheader; 2 gas-liquid mixer; 3 high pressure Air tube; 4 foam liquid human water pipe; 5 filter; 6 water tank; 7 water pump cable; 8 foam nozzle dust removal efficiency of breathing dust reached 8, or more, compared with the foam produced by the first nozzle for dust of different particle sizes Dust removal efficiency is relatively high.
The reason for the analysis is that the foam liquid sprayed by the first nozzle has a fan-shaped water curtain shape, and the coverage area is large, and the foam liquid spray distance is relatively far, and the water consumption is relatively small. +4 blocked this. 8 kinds of nozzles are the best choice. It can be seen from 7 that the dust removal efficiency of the compressed air foam dedusting system increases with the increase of the dust particle size, and the dust removal efficiency of the respiratory dust is 8;
The efficiency of the foam dedusting agent depends on the formulation of the foaming agent, including the choice and ratio of each agent. The basic formula of the foaming agent was determined through experiments, and then different proportions of additives were added thereto, and the optimum formula was determined by comparing the foaming height and surface tension of the foaming agents of different formulations.
The structure and aeration area of ​​the mixer directly affect the stability of the foam and can increase or decrease the aeration tube as needed. Increasing the aeration area is beneficial to improve foam stability, but an excessive aeration area will cause a decrease in the gas pressure at the gas-liquid mixture to adversely affect the stability of the foam. Considering the problem of equipment clogging in the downhole environment, a fan-shaped duckbill nozzle was selected, and a filter was installed at the water inlet of the pump and at the inlet of the mixer.
Foam nozzle 4.2 On-site dust removal effect analysis The foam sprayed by the compressed air foam dust-removing system can quickly cover the dust generated by the excavation operation, and can capture the floating dust in the air. The mixing point pressure used is 3, the dust-reducing effect is obvious, and the airborne The matching is good, the work is stable, the installation and maintenance are simple, and there is no bad l, l.
Mixed pressurization time 8 dust removal dust dust removal efficiency expansion ratio 2 liquid separation time efficiency field application dust dust removal efficiency average 919 respirable dust dust removal efficiency average 87.9 greatly improved the working environment of the working surface.
After field application, the compressed air foam dedusting system has stable operation. In addition to the high rate of left rose, structure; 1 single. The operation is 4, and the safety is high.
The analysis of the progress of dust dispersion has obtained the relationship between foam dust removal efficiency and dust particle size.
Prediction of Gas Emission in Mine Unexploited Area Based on Grey Theory Li Guozhen, Li Xijian, Meng Zhaojun 12. Dong Li 121. School of Mining, Guizhou University. Guiyang, Guizhou 550003, China 2. Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources in Guizhou Province, 55ooo3 gushing data of Guizhou Guiyang is the original sequence, and non-equal interval sequences are converted into equally spaced sequences. The differential equation prediction model is established by gray processing, and the non-mining gas emission amount after the deepening of the mining depth is predicted by the black color prediction model. The data support for the gas control work in the lower coal seam is provided. The amount of change is subject to a regular increase in the gas content of gas pressure with increasing burial depth. The relative amount of gas is also increased with the depth of mining, and the gradient of growth is different in different geological structures of coal. The conditions are different under the conditions of existence.
The amount of gas emission is affected by various factors such as the coal seam thickness and the geological structure propulsion speed of the mining method. The amount of gas emission is the result of a combination of known and unknown factors, so the mine gas emission is actually a gray system. The prediction of the mine's burial depth with the increase of the burial depth of the coal seam can avoid the influence process of various specific factors and adjust the position and angle of the spray head according to the needs when using the boring surface, and improve the dust removal effect. After field testing, the paper has been developed above and has high dust removal efficiency.
1 Jiang Zhongan, Jin Longzhe. Research on Dust Control Technology for Driving Roadway 2 Jiang Zhongan, Li Badyu. Du Cuifeng. Foam dust removal mechanism and bubble, Liu Jin, Zhang Yinghua, Huang Zhian. Mineral foam, dust collector composition and properties. 1.2008 Proceedings of Shenyang International Safety Science and Technology Symposium, Qi Zhilin, Wang Deming, Lu Wei, et al. Bubble, dust removal mechanism research, coal responsibility editor Zhao Qiaozhi Received date 2010, 26 fund project Guizhou Science and Technology Department International Cooperation Project Jinketong 2,98, No. 2, 98, Ministry of Education Chunhui plan teaching foreign minister to stay in 2008704 No. Project age section compositing word 20063029; national science and technology support plan special 200 he 08 rose 1
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