The Influence of the Closure Law of the Hydraulic Butterfly Valve on the Water Hammer of the Accident of the Parallel Group of Large Centrifugal Pumps
Taking the Quanmutang water conveyance project as an example,the one-dimensional characteristic line method was used to numerically simulate the water hammer of the accident shutdown,and the influence of the linear closing law and the two-stage closing law of the hydraulic butterfly valve on the water hammer of the accident shutdown pump in the parallel group of large centrifugal pumps was analyzed.The control variable method was adopted to analyze the changes of the maximum pressure of the water supply system and the maximum reversal speed of the pump under the two-stage closing law by taking the fast closing time,slow closing time and fast closing valve closing amount as variables,and the optimal valve closing law was obtained by comparing the water hammer of the pump stop under the condition of 2 pumps stopping at the same time and 1 pump running and 1 pump stopping.The results show that compared with the linear closing rule,the appropriate two-stage closing law can significantly reduce the maximum pressure of the pipeline and the maximum reversal speed of the pump,and the main factors affecting the maximum reversal speed of the pump are the closing amount of the fast-closing valve,and the secondary factors are the fast-closing time of the valve and the slow-closing time of the valve.Within the appropriate threshold,the larger the fast-closing valve,the shorter the fast-closing time and the shorter the slow-closing time of the valve,the optimal two-stage valve closing rule.
large centrifugal pumpsthe transition processhydraulically controlled butterfly valveclosing lawwater hammer of the pump stopped
NETL
NSTL
万方数据
