Summary of coal mine work

The four-month internship life is just like the end of the water flow. It is very deep to review the internship life, and the harvest is also rich. During the internship, I took advantage of this rare opportunity to work hard, strictly demanding myself, and humbly ask the older generation of underground technical staff to use the rest time to carefully learn some knowledge outside the textbook content and master some coal mine related skills. So as to further consolidate the professional knowledge that they have learned, and lay a firm foundation for the future to work. To be a combination of theory and practice, not to be completed during the internship, listen carefully to the leadership command, and get the unit leader and colleagues consistent Praise. Through the practice, I learned a lot of things that I couldn't learn in the textbook, and I got a deeper understanding of the underground coal mine production.

Our family has been working in coal mines for three generations of my family. I have to study hard and work hard with my grandfather and father. Through this internship, I have a deeper affection for the coal mine, and I want to join the coal mine work immediately and become an excellent coal mine technician. Zhang Mining Group Elk Mining Company is located in the 15km mining area of ​​the west of Zhuolu County. The mining area is convenient to the Zhuolu County, and the lower garden - Guangling Road, Jingzhang Highway and Beijing-Baotou Line Xinbaoquan Station are 45 kilometers away. It is 30 kilometers away, 80 kilometers away from Zhangjiakou City and 180 kilometers away from Beijing.

Elk Mining currently has three production mines: Xishanpo Well, Huangtuwan Well and Xisiwan Well. With the development of “safety first, prevention first, comprehensive control, overall promotion”, Elk Mining Company has moved to a new industrial road and joined the big group to become a state-owned key coal mine.

On the 25th of the internship, he started his internship at the Xishanpo Well of the Elk Mining Company.

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Xishanpojing well construction date December 1973, commissioning date January 1979, mine design energy country 210,000 tons / year approval capacity 150,000 tons / year, the existing capacity of 6 - 80,000 tons / year, the development method is Diagonal well development. The West Hillside Mine Field is 1900m long from east to west and 1500m wide from north to south, with an area of ​​1.3054km2. The north is adjacent to the Wujiagou coal mine of the village-run coal mine and the Hanjialiang coal mine of the individual mine. The east is adjacent to the company's Huangtuwan minefield; the south is bordered by the company's original Baijiawan well.

First of all, I learned about the major systems of Xishanpojing. There are three levels of improvement in the Xishanpo well, which are 410 level, 200 level and 85 level. It is a multi-horizon series of trucks. The three horizontal wells are all used in the ramp yard. The main well storage line has water tanks at each level. There is a ground fire pool outside the main inclined wellhead. The water capacity of each water tank is about 300m3. The normal water inflow of the mine is 30m3/h, and the maximum water inflow is 40m3/h.

In the underground, we worked internship with the old workers at the 802 coal mining face, which was 8 hours. Because it is the second working face of No. 8 coal, it is called 802 mining face.

The 802 coal mining faces are in the west wing of the 85th level, and the mining method of the working face is blasting. The working face is arranged along the inclined direction and advances. The length of the working face is 80 meters, the strike is 137 meters, the average thickness of the coal seam is 2.2 meters, the dip angle of the coal seam is 23 degrees, and the recoverable reserve is 95500t. The recovery rate is 95%. The coal seam exists in the mining area. , towards the se60 degree, the southwest slope, according to the roadway exposed, step-like, normal fault combination development, towards ne30 - 65 degrees. The coal seam is the No. 8 coal, which belongs to medium ash and low phosphorus. It is mainly powered coal. The direct top is medium-fine gray-white sandstone with black horizontal stripes. The pseudo-top is muddy shale. The roof of No. 8 coal contains The siberian gingival fossils are easily weathered and disintegrated. The bottom plate is gray-yellow grain sandstone, gray-black sandy mudstone, and the water is easy to expand the bottom drum. The relative emission of coal seam gas is 10.62m3/t, which belongs to high gas coal seam. The spontaneous combustion period of coal seam is 3-6 months, and the coal dust explosion index is 37%, which has explosion hazard.

The working face is a full-thick coal seam. The working face is made of sg420/22 flexible scraper transporter, then transferred to the sg620/40t flexible scraper transporter, which enters the coal-burning eye and is loaded by 85 horizontal lanes. The ton electric storage vehicle pulls 1 ton mine car to the external 85 level parking lot, and the second main main dark shaft winch enhances the outbound transportation. The working face adopts backward coal mining with a circulating progress of 1 meter. It adopts the operation mode of “three shifts of coal mining and side-by-side mining”. It adopts single hydraulic pillar support, positive cantilever beam beam support, and maximum control top distance 4 Meter, the minimum control top distance is 3 meters, the top step is 1 meter, and the goaf treatment method is all slumping. The face of the working face is blasted with three eyes, the depth of the blasthole is 1.2 meters, the distance between the eyes is 1 meter, the distance between the top eyes is 1 meter, the angle between the blasthole and the coal wall is 70 degrees - 80 degrees, and the inclination of the slab is 5 degrees - 10 degrees. The top plate is 0.3 m - 0.4 m, the bottom eye is 10 degrees - 20 degrees, the bottom of the eye is 0.3 m above the bottom, and the length of the cannon is not less than 0.5 m. The working face is equipped with “gas electric lock” device, adopting kj86 gas monitoring system, and two monitoring probes on the working surface. One is in the working face, the alarm concentration is greater than or equal to 1%, the power-off concentration is greater than or equal to 1.5%, and the re-concentration concentration Less than 1%, the other is located in the return wind tunnel, the top of the roadway. Set the alarm concentration to be greater than or equal to 1%, the power-off concentration to be greater than or equal to 1%, and the re-energization concentration to be less than 1%. The control range is all non-intrinsically safe electrical equipment on the working surface.

The working face mining process is: eye-catching - blasting - hanging beam - coal - moving - pillar

The upper and lower exits of the working face adopt 4 pairs of 8 beam end supports, which support the single hydraulic props in advance, double rows of 10 meters and then return to the single row of 10 meters. When the pressure is large, one beam and two columns are used for support.

The blasting method uses mhb-100 detonators, and the line-connecting method is used in series. The working surface types include: shooting gunners, gas clerk, returning column workers, driving slippers, eye-catching workers, coal-loading workers, shifting workers, etc.

In the second two months of internship in the air traffic control area of ​​the security, mainly to master the distribution of air volume and ventilation facilities.

The West Hillside well adopts central parallel extraction ventilation mode, the main well enters the wind, and the auxiliary shaft returns to the wind. The main fan model is: bo——11——6——no:18, the main well is mainly to enhance transportation and intake, and the auxiliary well It is the next person to transport materials and return to the wind.

The air distribution is distributed according to the working surface and the required air volume of the diversion room, and the effective air volume rate must reach 85%. The Xishanpo well is a high gas mine with a relative gas emission of more than 10m3/t.

Ventilation is divided into five groups: gas crew, gunner group, underground monitoring group, dust group, and ventilation group. In the ventilation area, five kinds of drawings were also drawn: the dustproof system diagram, the fire prevention system diagram, the disaster avoidance route map, the monitoring system diagram, and the ventilation system diagram followed by the ventilation west hillside well ventilation network diagram.

In the ventilation and also understand the installation of the explosion-proof water shed, the explosion-proof water shed is divided into the main explosion-proof and auxiliary explosion-proof. The main explosion is installed in the main inlet and return air passageway connecting the two wings of the mine with the wellbore, and between the mining area and the mining area, between the coal seam and the coal seam, and between the horizontal and horizontal levels. The auxiliary explosion-proofing is installed between the mining face and the digging well, the coal mining face into the return airway and the series working face.

Dust prevention measures in the underground include: mixed drilling, spray sprinkling, and water foam. And also know the installation of high and low gas mine probes.

In the interns, a new "series ventilation safety technical measures" and "safety technical measures for roadway penetration" were prepared for the safety supervision ventilation area. If the two roadways are facing each other, the work of the face must be stopped 30 meters apart, but Can not stop the wind, you must set a warning to block people, and then take a look at the direction of the wind flow when you cross, you should be prepared where to install the damper or adjust the wind window, the through point must be back to strong support. Also draw a front and rear schematic diagram of the ventilation system.

The fresh air of the Xishanpo well: the main inclined shaft - the main dark well - the second main dark well - 85 horizontal west alley - 802 mining face wind tunnel - 802 coal mining face

Stained wind: 802 coal mining face - 802 mining face return airway - secondary sub-dark well - sub-dark well - de-slanting well - ground.

I use my own professional knowledge to practice, and use practical work to consolidate the theory. I must not be afraid of hard work and hard work, and continue to consult with the old work and technical personnel. I have learned a lot of professional knowledge in this mine. There are still a lot of them that are not mentioned one by one, and they have to continue to learn in the future work. Guaranteed to live up to the expectations of teachers, parents, and mine leaders. Since you have studied this major, you can't learn from it. You have to learn a line. I believe that I will be able to make a successful achievement in my future jobs. .