| 摘要 |
PURPOSE:To prevent the pressure in a nozzle from decreasing to thereby enable cold water to be sprinkled uniformly and to improve the cooling capacity of the cooling tower by a method wherein a plurality of sprinkling pipes provided with independent valves, respectively, are arranged in the cooling tower and the opening and closing of the valves are controlled in proportion to the entire quantity of sprinkling water. CONSTITUTION:A main pipe 3a extending from a load 6 is separated into a plurality of sprinkling pipes 3A, 3B and 3C having the independent valves 9A, 9B and 9C through a branch header 12 and these sprinkling pipes are provided in a multiplicity of stages within the cooling tower. When the open air temperature and humidity lower and the load is reduced, the temperature of water at the outlet of a heat exchanger as the load lowers. Consequently, a temperature detecting flow rate control device 7 operates to reduce the entire quantity of the sprinkling water by a flow rate adjust valve 8 and a flow rate detection control device 10 operates the changeover valves 9A, 9B and 9C, selectively. That is, the device 10 which has detected the reduction of the flow rate through the main pipe first choke and then closes the valve 9A of the lowermost stage sprinkling pipe 3A and when the quantity of the entire sprinkling water decreases further, the valve 9B of the intermediate stage sprinkling pipe 3B is chocked. Thus, even when the entire quantity of the sprinkling water decreases, the valve of one of the sprinkling pipe is closed so that the pressures of the remaining sprinkling pipes do not lower and a uniform sprinkling operation is maintained. |
