Optimization of air supply ducts for air compressors in the central area of ​​Xishimen Mine

Minmetals Xingming Mining Co., Ltd. Xishimen Iron Mine is one of the four underground metallurgical mining enterprises in China. It was officially put into operation in 1985. The air supply of Xishimen Mine uses air compressors to supply wind to the mining area equipment. There is an empty surface in the central area. There are 6 air compressors in the press station, which are maintained and managed by the machine repair power workshop. The medium air compressors in the middle area of ​​the machine repair power workshop in Zhongyi and Zhonger District are concentrated for air supply. The North Mining District and the South 1st and 2nd Districts use underground mobile air compressors for centralized supply of air.

The surface air compressor in the Central District is used by the Central 1 and 2nd mining areas, and is supplied by the 35kV station 635 and 641 lines to the Central District Substation, and the Central District Substation is given to the Central Area Air Compressor. The displacement is 40m3/min. It passes through the inclined shaft of Zhongyi District to the stope of Zhongyi and Zhonger District.

The air compressor in Nanyi District has 3 sets of 80 levels and 17 Sichuan, model SAT-75A, displacement 14.1m3/min, maximum discharge pressure 0.75MPa.40 level 5 Sichuan, model XP450E, nominal volume flow 12.7m3 For the South District to use the wind.

There are 8 mobile air compressors in the 4th level of the South 2nd 40th, and the mobile screw air compressor model SAT-75A has a displacement of 14.1m3/min for the wind in the South Second District.

In the original development area 0 level, there are 7 mobile air compressors in the south 2rd Sichuan area, and the air compressor type 1 middle area air supply pipeline overview. The first and middle second mining areas adopt the centralized air supply mode, which is passed by the surface air compressor station. The pipe network supplies air to the underground. The path is used by the central air compressor station to make the 377mm pipe pass through the middle zone inclined well to the 120 level drop point, and use the ¢150mm pipe to pass the 120 level 4 Sichuan from the 120 level to the 80 level horizontal well to the 80 horizontal transport alley to the middle. In the 80-level clamp work room of the mining area, the 80-level clamp work room in the middle-meter area is divided into two roads. The one-way use 150mm pipe to the middle one-meter area, and the other way uses the 150mm pipe to the middle two mining area.

2 The reason for the reconstruction of the air supply pipeline in the central area is that the wind pressure is 0.3 MPa when the normal use wind is reflected in the middle and second mining areas. If the wind is used for excavation and stop, the wind pressure should be above 0.45 MPa, and the wind pressure should be above 0.5 MPa to meet the requirements. The mining area is excavated and the medium and deep holes are used for normal production. The wind supply and wind pressure need to be modified.

The air supply equipment is normal, and the reason is the pipeline.

According to the air volume statistics of the wind power equipment in the first and second mining areas, the normal air consumption is 135m3/min, and the total air volume is 165m3/min, totaling 300m3/min. The air supply pipe inner diameter d is calculated according to the following formula. : The flow rate (mVmin) 4 in the free state of the compressed air passing through the J pipe section is the sum of the lengths of the sections from the gas point to the compressor section, and this length should be included in the partial equivalent length (m).

(1500x225L81/5=208mm Through the above calculation, the inner diameter i of the first and second air supply pipes must be greater than 210mm. At present, the actual air supply pipe inner diameter J of the middle first and middle second mining areas is 150mm, which cannot meet the air supply demand.

3 Central District Air Supply Pipeline Optimization Plan According to the current actual production wind conditions, consider the medium and middle two residual ore. The optimization scheme for the central district air supply pipeline has the following three: the first one mining area uses the current air supply pipeline. . After the horizontal section of the first mining area 124 reaches the horizontal slope of 105 and forms the independent ramp of the middle one mining area, the middle first mining area is leveled from the 120 level to the 377mm pipeline, and a six-inch air duct is communicated to form the middle one. District independent air supply system.

Form an independent air supply system in the first mining area.

The No. 2 mining area is connected to a 377mm main pipe from the 160 level, and a four-inch air duct is connected along the 160 level to the 80 horizontal slope to communicate with the original supply air line at the 80 level for the production of the secondary second mining area. Originally in the Zhongyi mining area 80 horizontal bench work room all the way to the wind to the second two mining area valve switch removed.

The main pipe of 377mm is connected to the upper pipe, and the pipe is connected to the original air supply pipe along the horizontal level of 160 to 80.

From the 120 level 4 Sichuan to the Zhongyi mining area 80 horizontal clamp work room, the 50mm pipe of the 80-level clamp work room in the middle first mining area is changed to the 00mm pipe, and the length is 400m (determined by the above calculation).

A mobile air compressor station is established underground, and each of the first and second centers forms its own independent air supply system. Mobile air compressors have been used in many mining units, and the West Shimen Mine has been used in some mining areas.

Proposal I is recommended for the following reasons: (1) Impact on production. The construction of the scheme is simple and safe, because the entire construction site is along the slopes and all the way, which does not affect the current production. The construction of the slippery shaft is difficult and affects production.

(2) Long-term consideration. If the plan is adopted, 120 horizontal stop (down to page 85) 1 - balance beam 2 upper roll assembly 3 - connecting plate 4 in the roll assembly 3 transformation effect is now averaged each time the specification change roll time (average 171min) and Compared with before the technical transformation (average 434min), each roll change time saved 263min, and the whole line of large roll change was realized within 3h. At present, the average roll change is 10 times per month, which saves 44h per month, thus realizing rough rolling mill. After quick roll change, the labor intensity of the workers is greatly reduced, the work efficiency is improved, and the rolling time and strength of the rolling mill are optimized, and the roll change work of concentration, tension and high strength before the transformation is avoided, and more manpower and material resources can be invested. Focus on rolling mill adjustments to reduce the occurrence of process accidents and increase the yield. At the same time, the travel time is reduced and the equipment maintenance efficiency is improved.

4 Conclusion The small wire of Laigang Steel Co., Ltd. is one of the main production lines of Laigang Hot Rolled H-beam. It starts with the technology of digestion and absorption, and takes the technological innovation measures to maximize the capacity of the process. Maximize production capacity, optimize process coordination, and optimize economic indicators. Comprehensive research and innovation in terms of equipment, process and product performance, promoting the development of new products, improving production capacity and improving product quality. In the small-scale hot-rolled H-beam roughing mill rapid roll change device transformation and application, production capacity improvement, production system automation construction and other aspects of systematic and in-depth research, carried out a lot of fruitful work to make the production line production The capacity has been greatly improved, and the main economic and technical indicators have completely surpassed the original design level, creating huge economic and social benefits.

National Hydraulic and Pneumatic Standardization Technical Committee. China Machinery Industry Standards Compilation of Hydraulic and Pneumatic Volumes. China Standard Press, 1999 Hydraulic equipment innovative design and manufacturing and quality inspection technical standards (implementation manual). Anhui Culture Audiovisual Publishing House, 2004 Wen Bangyi editor. Mechanical design manual. Fifth edition. Mechanical Industry Press, 2010 responsible for the small-line hydraulic technology work of steel-type steel mills.

(Continued from page 83) After the end of the remnant, if the roadway collapses, it will affect the wind supply in the central area, and finally the plan will need to be adopted.

(3) Input costs. To use the program, you only need to invest 1 plan. You need to invest 400m8 inch tube and one slide, and the direct cost is 400x78=31,200 yuan. The cost of hitting the well is 40mx2000 yuan = 80,000 yuan. A total of 111,200 ytj program I input costs are greater. Zhongyi and Zhongji each purchased 6 sets of 20.5m3/min mobile air compressors to meet the air supply requirements. Each unit is calculated at 160,000 yuan, and the direct cost is 12x16=1.92 million yuan. More funds are invested, and according to the limit of mining resources, the program I cannot be adopted.

Temporary measures for January-February 2011 (1) The first-stage mining area shall remove all the air supply pipes and valves used for the loss of the 120-level four rivers to reduce the amount of air used in the mains. From the 120 level drop point to the 377mm pipe, communicate one (100mm pipe, dedicated to the 116 level 6, 7, 8 way to the stop hole in the wind, 124 level to use the wind.

(2) Immediately handle the running wind of 160 horizontal port and 120 level-80 horizontal chute to reduce the loss of air volume on the main pipe.

5 The first and second mining areas adopted by the plan adopted the plan and strictly followed the construction organization design plan. In April 2011, the two mining areas took 6 days to re-discharge the pipes, and the organization personnel replaced the air supply pipes and reached the wind pressure requirements after replacement. To meet the normal production needs of the two mining areas for tunneling and medium-deep holes.

6 Conclusion In the first and second mining areas, after adopting the scheme, after the air supply pipeline was reconstructed, the independent pipelines in the two mining areas reached the wind pressure requirements, which met the wind requirements of the stope equipment and eliminated the tubes. The safety hazard of the roadmaster has ensured the normal production of the two mining areas, and it is expected to increase the indirect efficiency by 300,000 yuan.

1 programming technology practical tutorial. China Railway Publishing House, Shi Boqiang, Shen Yuhua compiled. Fractal methods for mechanical fault diagnosis - theory and practice. Metallurgical Industry Press, 2001 Institute of Electrical and Electronic Engineering Research.

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