1 reform operation time
Most of the underground operation time in mines in China is implemented in the “three shifts and eight hours†work system. This is not very suitable for the main production types of the underground production areas where the production environment is effective and the physical labor is heavy. The observation and analysis of the work type shows that the actual working time of the main types of work produced in the underground is only 5 to 6 hours. However, the working environment in the underground is poor, and it is difficult to increase the quota for 8 hours. If the eight-hour work system can be changed to a six-hour work system without reducing the labor quota, output and quality, the production time of production workers can be shortened, the time of exposure to dust can be reduced, and the health of employees can be improved. Improve the production enthusiasm of workers, and use six hours of idle time to stop production at the peak of electricity consumption, and contribute to regional adjustment. It can also greatly reduce energy consumption. With 6 hours of downtime, the equipment maintenance and repair work is strengthened to keep the equipment in good condition for greater efficiency. In January 1980, the three-shift and six-hour work system was piloted in the West Main Well section. The results were super-expected in the month.
In the second month, it was implemented in various sections of the entire mining area. After three months, it will be extended to all major types of work in the whole mine.
After half a year, in terms of production and electricity consumption, compared with 1979: the output increased by more than 10%. The electricity consumption was reduced from the previous year's average of 1711918kWh/(t mine) to 1112449kWh/(t mine), down by 3618%. At the beginning, it was concentrated power outages, only avoiding the late peaks, and later implemented a sectional power outage. The power outage was from 8:00 to 11:00 and from 6:00 to 9:00. This avoids the peak electricity consumption in the morning and evening, greatly improving the electricity consumption of the peaks and valleys, and has played a powerful role in the regional load adjustment work. To this end, the mine has received nearly a million yuan in electricity from the Shaoxing Electric Power Bureau. This system has been in place since 1980. Practice has proved that this is an effective way to adjust the load and save electricity, reduce costs, welcome workers, and benefit enterprises.
2Select the optimal air pressure of the air compressor station and reform the cooling water
A mine with wind pressure as its power, its air compressor station is a large power consumer, the eastern mine area of ​​Yantie Mine. In 1990, the total electricity consumption in the whole district was 5.82 million kWh. The air compressor station used electricity was 31.115 million kWh. It accounts for 5315% of the total electricity consumption. Therefore, the air compressor station should be listed as the main target of mine energy conservation and consumption reduction.
The air pressure delivered by the air compressor station directly affects the efficiency of the pneumatic equipment, which directly affects the energy consumption. Long-term on-site observation and analysis found that: 1 When the wind pressure is below 0.4 MPa, the efficiency of other pneumatic equipment is significantly reduced except for the ZY-24 rock drill. Some pneumatic equipments are more than 50% less efficient than normal wind pressure. 2 When the wind pressure is 015~0. 7MPa, all the downhole pneumatic equipments operate normally and have high efficiency. 3 When the wind pressure is above 0.7 MPa, the efficiency of the pneumatic equipment is high, but the vibration is large, the equipment is easily damaged, and the operation of the workers is difficult. 5 å·¦å³å·¦å³ã€‚ The wind pressure of the standard is about 0. 5MPa or so.
5 Increase the wind pressure of about 0 MPa, and increase the air volume of the air compressor on the original basis. 5至0. 65MPa (wind pressure of the production working surface), the optimum wind pressure section of the venting area is 0. 5 ~ 0. 65MPa. In order to achieve this optimal wind pressure section, the following measures have been taken:
(1) Adjust the air pressure of the air compressor safety valve. The pressure drop is generally 0. 05~0. 15MPa). The pressure is reduced from 0. 05 to 0. 15MPa.
(2) The air pressure of the air compressor station is changed from 0. 5 to 0. 6MPa, and changed to 0. 6 to 0. 7MPa. Use the start-stop air compressor for control adjustment.
(3) Strictly control the wind equipment and arrange the three shifts in a reasonable balance to ensure the balance of wind pressure.
(4) Strictly manage the air leakage under the well, regularly check the air leakage of the underground pipeline and the pneumatic machinery from time to time, and find that the air leakage is handled in time. It is also linked to the economic responsibility system to ensure that wind leakage is avoided.
The best wind pressure section is selected for air supply, the annual electricity consumption is 431676kWh, and the power saving is 12165%. After the cooling water purification of the air compressor is reformed, the electricity consumption is reduced by 1314%. The annual electricity consumption is 903961kWh, the power saving is 26149%, and the economic benefit is near. 16.15 million yuan.
3 utilization of residual heat of air compressor
The air compressor exhaust pipe temperature is 120-160 °C. In summer, the temperature is as high as 166 ° C, which exceeds the design temperature, which has a serious impact on the lubrication of the pressure fan and the operation of the machine. The temperature of the compressor is directly proportional to the power consumption. In the case of the same production volume in the eastern mining area, the total electricity consumption of the cold sky press is about 200,000 kWh per month. In the summer, the monthly power consumption is above 300,000 kWh. Therefore, reducing the temperature of the blower is the key to reducing power consumption, reducing spare parts consumption, and increasing operating rate and service life.
In order to reduce the air-voltage consumption of the air compressor and make full use of the remaining heat, install the pipe sleeve or the slot in the exhaust pipe of the air compressor, and then connect them in parallel to concentrate on the bathroom for the employees to take a bath. The residual heat of the exhaust pipe of the air compressor station of such a medium-sized mine can be used for bathing by about 1,000 people, saving about 200 tons of coal per year. For the pressure fan, the temperature of the exhaust pipe can be lowered by about 20 ° C to achieve energy saving.
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