山西寺河矿“三进三回”通风系统优化设计

寺河矿当前采用分区通风方式，由3个进风井和3个回风井组成，通风系统复杂。随着生产的持续，出现1#回风井所在分区通风系统风量利用率低、电力消耗较大、风机低压供电不稳定和2#回风井所在通风区域巷通风距离长、阻力大、通风能力近饱和等问题，整个矿井安全可靠性较差。通过对矿井进行通风参数测试与数据处理、通风系统网络普查，构建了通风仿真解算网络，从通风系统阻力合理性、矿井各用风地点风量供需对比、三区阻力分布和公共进风路线对风机工况扰动等角度详细分析了当前通风系统存在的具体问题。对主干风路（3个进风井和3个回风井）的过风能力和各用风点的需风量进行了核定，根据总进风量满足生产需求且总进风量与总回风量相匹配的原则，提出将当前3#进风井变为回风井、将1#回风井和2#回风井变为进风井的改造方案，即将“三进三回”通风系统改造为“四进两回”通风系统。对改造后的通风系统重新进行了盘区划分，按照选定的最优盘区划分方案对“四进两回”通风系统进行了调整，最终总回风量达到17 743.2 m3/min，回风量增加，总阻力降低，各用风点的风量满足要求，系统阻力分布合理，风机能耗降低。

Optimization Design of the “Three Intake Shafts and Three Return Shafts” Ventilation System of Sihe Mine in Shanxi Province

Zoning ventilation system is used in Sihe Mine currently，which consists of three intake shafts and three return shafts，and the ventilation system is complex.As production continues，many problems have arisen，such as low utilization rate of air volume，greater power consumption，unstable low-voltage power supply of fun in ventilation system of No.1 return shaft，long ventilation distance，large resistance and ventilation capacity near saturation in ventilation system of No. 2 return shaft，the safety and reliability of the whole mine is poor.In order to solve the above existing problems，the ventilation simulation computation network is established by means of ventilation parameters testing，data processing and ventilation system network surveying，and so on.The specific problems of current ventilation system of the mine are analyzed in detail from the aspects of resistance rationality of ventilation system，comparison between supply and demand of air volume in different using places，resistance distribution in the three zones and disturbance of public air intake route to fan working conditions.The ventilation capacity of main air routes （three intake shafts and three return shafts） and the required air volume of each using places are checked.According to the principle that the total air intake should meet the production demand and the total air intake should match the total air return，the optimization and improvement scheme of transforming 3# air intake shaft into return shaft and transforming 1# and 2# return shafts into intake shafts is proposed，that is，the “three intake shafts and three return shafts” ventilation system is transformed into “four intake shafts and two return shafts” ventilation system.The “four intake shafts and two return shafts” ventilation system is re-divided into different sections，and the new ventilation system is adjusted according to the selected optimal partition scheme.The study results show that the final total return air volume reaches 17 743.2 m3/min，the return air volume is increased，the total resistance is decreased，the air volume at each using place meets the requirements，the system resistance distribution is reasonable and the energy consumption of the fan is reduced.