Discussion on the process measures for energy saving in mine ventilation
The successful experience of using this ventilation method in Xihuashan Mine and the application of other mines prove that all qualified mines should be given priority. For mines with large mine fields, deep mines and long mining time, in order to improve the ventilation difficulties, waste wells should be used as much as possible to form a parallel ventilation network for multiple wells. The single wing is a two-wing exhaust system, which can effectively reduce the total wind resistance of the mine and reduce the ventilation energy consumption. The wind resistance of a single-wing diagonal exhaust shaft in a gold mine accounts for 80% of the total wind resistance of the whole mine. After transformation into a two-wing diagonal system, the ventilation power consumption is reduced from 473.5kW to 105.1kW, and the energy saving is over 75%.
Optimize the ventilation network. Optimizing the ventilation network is to solve the problem of the network, and to minimize the power consumption of the entire network under the premise of meeting the requirements of the working face and the air volume of the roadway. Ventilation networks can be divided according to their degree of control: natural wind network: For multi-wind well natural wind network, the minimum power consumption condition is that the working wind pressure of each fan is equal, which has been proved by many researchers. Controlled Ventilation Network: The air volume of each branch of this type of network is known, requiring the location and operating conditions of the fan and control facilities to achieve the required pressure drop and to meet the loop wind pressure balance. The main methods are linear programming and critical path method. . General-type ventilation network: that is, part of the natural wind-dividing part controls the wind-dividing network. The optimization research of such networks is relatively difficult and the development is slow. Such problems are generally solved by nonlinear programming, and various applicable solving methods are also available. Diversified, such as penalty function method, constrained variable scale method, generalized parsimony method and mixed penalty function method.
Through continuous improvement of this type of fan and continuous improvement of performance, good energy saving and consumption reduction effects have been achieved. Especially after the country ordered the fan to eliminate the product, it increased the efforts to develop new alternative products. In a short period of time, it developed K-series, FZ series and FS series and other ventilation equipment suitable for metal mines. These new fans have improved blade shape parameters, good aerodynamic performance, large air volume, low wind pressure, high fan efficiency, low noise, elimination of "hump", simple structure and easy installation, thus quickly replacing the old fashioned Fan. These fans not only match the characteristics of the metal mine network, but also have obvious energy-saving effects, creating good economic and environmental benefits.
Beryllium Copper
One of the highest strength copper based alloys available on the market today is beryllium copper, also known as spring copper or beryllium bronze. The commercial grades of beryllium copper contain 0.4 to 2.0 percent beryllium. The small ratio of beryllium to copper creates a family of high copper alloys with strength as high as alloy steel. The first of the two families, C17200 and C17300, includes high strength with moderate conductivity, while the second family, C17500 and C17510, offers high conductivity with moderate strength. The principle characteristics of these alloys are their excellent response to precipitation-hardening treatments, excellent thermal conductivity, and resistance to stress relaxation.
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