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目前我国大中型煤矿,多采用风机并联运行进行矿井通风。风机的和功率、电耗均很大,因而在保证矿井足够风量的前提下使风机处在能耗最低的工况下运行是具有巨大的经济意义的。应当指出,矿用通风机联合工作的工况调节带有主观的随意性,其工况确定常用的是图解法。本文利用解析法确定风机并联运行的每台风机工况。一、按风机并联运行和功率最小进行风路的风量分配如已知网路风阻 R_i,可根据风流能量平衡式建立如下的非线性方程组:f_1(Q_1,Q_2,…,Q_n)=0f_2(Q_1,Q_2,…,Q_n)=0……………………………… (1)………………………………f_a(Q_1,Q_2,…,Q_n)=0对上方程组线性化之后,给出风量初值经多次重复计算才能求各风路的风量 Q_1,Q_2…Q_n 的数值。1.确定风机联合工作的理论的允许风量变化域。
At present, China’s large and medium-sized coal mines, more use of fan operation in parallel mine ventilation. Fan and power, power consumption are very large, and thus to ensure that the mine air flow under the premise of the fan in the lowest energy consumption operating conditions are of great economic significance. It should be pointed out that the working conditions of mine ventilator joint work with subjective randomness, the working conditions are often used to determine the graphical method. In this paper, the analytic method is used to determine the operating condition of each fan running in parallel. First, according to the fan parallel operation and the minimum power to carry out the air distribution of the wind If the wind resistance of the network is known R_i, the following nonlinear equations can be established according to the wind energy balance: f_1 (Q_1, Q_2, ..., Q_n) = 0f_2 Q_1, Q_2, ..., Q_n) = 0 (1) .................. f_a (Q_1, Q_2, ..., Q_n) = 0 pairs After linearization of the upper system, the numerical value of air volume Q_1, Q_2 ... Q_n of each air duct can be obtained after repeated initial calculation of initial air volume. 1. Determine the theoretical allowable air volume change field for combined fan operation.