Optimization Research On The Energy-saving System Of The Subway Tunnel Ventilation

With the rapid development of economy in our country, the level of urbanization in our country improves constantly and the, urban population increases rapidly. An increase in the number of private cars has led to the urban road congestion tend to be serious, so more and more cities make the development of the public transportation as an effective means. The subway is born as a modern underground rail transport, and it is with faster speed, larger load, lower energy consumption, lower pollution, safer,higher efficiency of operation and more comfortable, compared to the traditional public transport,, which has become a mainstay of urban public transport. At the same time, the subway can also be used as a guide of city layout, create new jobs and economic growth, promote the sustainable development of the city of the future, and to promote the comprehensive status of the city also is of great significance in terms of macro economy,.Metro Subway ventilation and piston wind during the metro operation in the tunnel is deeply related to the energy consumption. With the wide application of the subway, study on the underground ventilation system is of great significance and value for energy saving of subway operation. This paper mainly analyzed the tunnel ventilation system and put forward some feasible means for energy-saving. Metro tunnel ventilation system generally use the forward the most unfavorable conditions as a design standard of operation condition selection, which lead to larger waste of energy. In order to study the corresponding energy saving measures and achieve the goal of energy saving, the hourly thermal environment of different operation periods and different ventilation rates was studied numerically, based on the analysis of different operation load, the ventilation rate and the operation mode and taking the distribution of wind pressure into consideration. By establishing a simple system model, this paper simplifies the model design, ignoring the line, civil and other conditions on the running state of the system, outstanding the effect of the research factors on the running state of the system. Based on the numerical simulation results, the temperature distribution, air velocity distribution, pressure distribution of the tunnel and operation mode were analyzed. The energy saving way for the tunnel ventilation system is put forward. First of all, the tunnel ventilation system are introduced in this paper,, and the principle of tunnel ventilation system and simulation calculation is based on the theoretical calculation and derivation. Secondly, based on the ventilation rate of heat exhaust air fan, the logarithm of driving in station tunnel and the outdoor environment changes, the temperature, air velocity and pressure in the tunnel are analyzed, and the energy conservation plan of the station tunnel ventilation system is studied. Then, through the analysis of the tunnel ventilation system process model under various working conditions, a reference is provided for the optimization design for process model. At the same time, tunnel ventilation modes during day and night based on the tunnel length and the ventilation rate is analyzed, and optimization model for blocking the working condition of process from the standard interval blocking working process model and working condition of blocking technology with a wiring interval model simulates and analyses the two patterns. Finally, it is concluded that close the orbit hot well at the beginning of the subway operation and recently, the temperature in the tunnel can meet the specification requirements and it can save a large number of energy consumption; Forward the recommended reasonable row hot airflow is 40 m3 / s; In The forward, the main performance of the piston shaft is to introduce fresh air. The effect of the surrounding ventilation on the ventilation section is very small, but the vertical air distribution in the section is influenced by the interval length and the supply and exhaust ventilation rate of the station. Three energy-saving solutions to the station tunnel ventilation are provided. The first is a segmented adjustment, the second is it is contrast adjustment, and the third is a dynamic adjustment. According to the analysis of the three kinds of schemes above, in order to control the tunnel environment conveniently, simplify the system design and interface and reduce the equipment performance requirements, the recommend solution for adjustment is to combin the first and the second method. And it is found that a reasonable arrangement of the tunnel slope helps to decrease the temperature in the tunnel, and is also a kind of energy saving control mode. of. The frequency conversion technology in tunnel ventilation system also has a great application prospect, and its energy saving effect is significant.