Ventilation system design is actually the process of selecting critical fan and fan locations in a known ventilation network. By setting and optimizing the fan, the ventilation network realizes the orderly flow of the downhole air under the action of the fan power source to meet the wind requirements of the mine working face. System design must follow the basic principles of reasonable technology, economical, practical, safe and reliable.
The mine ventilation system is based on the development system and the stope structure. Therefore, when formulating the ventilation system, it is necessary to prepare the system map, mining method map, mining schedule, mining middle plan, service chamber (such as crushing system). Layout drawings, etc. The main contents of the ventilation system are: determining the ventilated roadway of the system, the ventilation network structure of the stope, and the working surface and location where ventilation is required. The drafting scheme is mainly based on the ventilation mode and the location of the fan. According to the characteristics of the mine, the fan can be selected for centralized ventilation (such as centralized ventilation) and the fan with more dispersed ventilation (such as multi-stage station). Select key installation lanes in the main roadway of the wind turbine. The installed roadway must have such characteristics: the screw unit roadway can control the total inlet or total return air of the system or section, and the independent ventilation system or the inlet and return air passages of the working face can be considered as the installed roadway. Centralized ventilation is actually a kind of ventilation method with less installed points and relatively concentrated fans. It is mainly suitable for the mines with relatively concentrated working faces, and a single mine with main inlet and return air shafts. Single main fan ventilation can not control the multi-middle working face of the underground to control the wind, and the reliability is poor. Multi-stage machine ventilation is a kind of ventilation method for multi-fan combined operation, suitable for the middle of the operation and the scattered working surface. The mine has high reliability and good ventilation effect.
Due to the backward calculation method and calculation tool, the traditional ventilation system design cannot solve the ventilation network iteratively, so it is impossible to know in advance the ventilation effect of the system design scheme. The ventilation expert introduces advanced mathematical models and calculation methods. The proposed ventilation system and ventilation scheme can be comprehensively calculated and optimized, and the optimization results of the network can be used to accurately evaluate the advantages and disadvantages of the design scheme. To carry out comprehensive network optimization design and calculation, it is necessary to prepare raw data related to the ventilation system, such as converting the ventilation network into a mathematical model (database) expressed by node number, node coordinates, node-related data, and if necessary, roadway must be prepared. Basic parameters (section, perimeter, support code) and basic data for the ventilation system.
Ventilation network generation is the initial processing of raw data, mainly to complete data conversion, independent loop delineation, air volume initial draft, network initial calculation and so on.
Fan optimization and selection of fan selection is the process of selecting the appropriate fan for all installed roadways in the proposed ventilation system. Due to the different network wind resistance and network characteristics of each installed point, the required fan models are different, the same installation point. There are also multiple optional fans or multiple installation angles in the roadway. Therefore, there must be an optimized selection process. The equipment operating cost and infrastructure cost within the service life of the ventilation system are the main function of the ventilation expert to optimize the selection of the fan. mathematical model.
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