Briefly describe the optimization of multi-stage station wind distribution system

Advantages and main problems of multi-stage station ventilation system. Advantages, multi-stage station ventilation system, from the perspective of energy saving, its significant economic benefits are obvious. From the situation of the ventilation system of the multi-stage machine station of the Jingtieshan Mine I ore body, it has produced considerable economic benefits. At present, according to the technical process of the Jingtieshan Mine and the requirements of the blasting operation, the system can be fixed and fixed according to the specific conditions of the production of the stope. If the adjustment is properly commanded, the system running time of at least 4 hours per day can be calculated according to the total power of the system of 799kw, and only one item can save more than 250,000 yuan per year, and the system runs according to the requirements of production level according to the demand for air supply. It also produces very significant economic benefits. Compared with the main fan ventilation, its economic benefits are more impressive. The ventilation system is easy to adjust, which is another advantage of the multi-stage station ventilation system. Whether it is from the adjustment aspect of the stope or from the perspective of the system's on-demand air supply, we have realized the benefits of easy adjustment. In the process of system operation, according to the actual production process of mining, mining and other processes, the position of the I and l-class machine fans can be adjusted at any time according to the progress or requirements of the stope adjustment, so as to improve the ventilation effect; According to the requirements of each level of wind demand, the fans of all levels of the station can be activated to adjust the operation of the system in real time to achieve energy saving.

Problems in the ore body ventilation system (1) 15 fans of the ventilation system, except for the 4 fans of the I-class station, the n-class fan and the facilities of the I-class and melon-level machine stations are all arranged in the stope, and the power is The control cable is also placed along the veins of all levels of the stope, within the range of blasting shock waves and seismic waves, and with the advancement and adjustment of the stope, this effect will become more and more, especially the stope advances to the Pulse, the fan of this level can not be set, and because the mining and other units use wet operation, the machine side Control Cabinet and the power distribution cabinet are seriously affected by the tide, which causes the accident of the short-circuited spare parts of the electrical department of Baoding Tianwei Transformer Co., Ltd. to occur. It seriously affected the operation and maintenance of the system, reduced the fan drive rate, and seriously restricted the safe production of the mine. At the same time, due to the fan and other supporting facilities in the stope, the operation and maintenance of the system is relatively difficult, and the cost is correspondingly increased. (2) According to the original design requirements, when the mining operation is advanced to a certain extent, the fan of this level must be dismantled, so as to be installed to the next level of operation, the removal and installation cost of the fan is large and seriously affects the system. normal operation. (3) Considering in the long run, to ensure that the ventilation system ventilates above the 2655m level of the I ore body, it is necessary to consider the current mining actuality of the I ore body and its propulsion speed, especially the two return air wells of the ventilation system. Arranged at the 2715m level, when the mining is reduced to the east of the 2,715m level, the eastern return air system will be seriously affected, so it is necessary to consider the use of the western return air well to improve the return air rate. At the time of the mine I ore production, the above test data showed that the system design was quite successful. However, with the decline of the production level of I ore body, especially the gradual closure of the I and I ore bodies in the east and the tunneling of the 2700m horizontal development roadway have basically formed the inlet and return air system, and the air leakage and stringage of various horizontal wells are serious, resulting in the system. The effective air volume rate has also been reduced, and the fans of some I-class stations have even lost their functions. Therefore, it is imperative to transform according to the actual situation.

The overall idea of ​​the system transformation plan is to renovate the system: make full use of the existing ventilation facilities and ventilation tunnels, continue to play the advantages of multi-stage stations, improve the system operation efficiency and effective air volume rate, and minimize the maximum The operating and maintenance costs of the system itself. System transformation plan. According to the actual situation of the stope, it is preliminarily determined that the wind turbines of the Class I stations at all levels in the stope will be dismantled and directly moved to the inlets of the inlet air inlets in the 2655m horizontal intake tunnel for installation. It should also be installed nearby, so as to fundamentally solve the problem that the wind turbine and its power distribution facilities are affected by the production. The four wind turbines of the vessel-level station are retained. When the mining is advanced to a certain extent, it can be at the east of the 2715m level. 4 Remove the fan and re-select it. If the fan is difficult to install, you can re-select the 1st and 2nd fans of the 2715m horizontal western return airway according to the actual situation (mainly select high-power fan). ), adopting the single-wing return air method in the stope to achieve the predetermined ventilation effect.

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