Strategies For Designing A Safe And Energy-saving System Of Industrial Circulating Cooling Water

For a system of industrial circulating cooling water, its working principles was analyzed, which shows the complexity, multi terminal, high circulating rate and the media adoption points. These points assure the right operation of the production and the security of the production. Its design methods were developed and strategized for designing a safe and energy-saving system, eliminating the risk and decreasing the energy consumption of the production. To get control of all the points above, several plans of design are developed, including the piping system plans and equipment calculation and adoptions, solution for flow and pressure balancing, improvement for low operation efficiency of the cooling tower and protection of the overloading of the circulating pump. Main conclusions are as follows:(1)For a countercurrent cooling tower,a thermal dynamic model based on the enthalpy potential method was developed, a numerical solution for the dynamic model was proposed.Methods of calculating the cooling number and characteristic number of a cooling tower were suggested, and the effects of filler’s character and ratio of air to water on the cooling performance were analyzed.( 2) For a typical task of cooling water, based on the curves of cooling number and characteristic number of a cooling tower, methods and procedures of determining the proper ratio of air to water, air flow rate and volumes of filler were developed. Factors influencing the water losses by evaporation, wind blowing and pollution discharge were investigated, and the methods of calculating the water losses were proposed. Methods of designing the pumping and fanning units of a circulating cooling water system were proposed.(3)Aiming at the common running problems of a circulating cooling water system, the causes of these problems were analyzed from the aspect of designing. The water flow rates and water pressures can be balanced by improving the water distribution system and reversed return pipes system. The cooling performance of a cooling tower can be improved by determining the proper volumetric heat transfer coefficient of filler in the cooling tower and setting the inlet water pipe system to be circular. Pumping out a water collection tank problem can be avoided by enlarging the water collection tank or setting slow-close valves at the end of water return pipes. Water competingof pumps and overload operation of motors can be effectively avoided by improving the flow conditions of water suction wells and determining the proper numbers of working pumps.( 4) Bases on the energy consuming of circulating pump and fan turbine for industrial circulating cooling water system, the energy saving could be carried on as following methods.Perform systematic measurements of the thermal and hydraulic characters of filler in the cooling tower, designing and optimizing the circulating cooling water system scientifically. Utilize the reclaimed heat from the circulating cooling water system comprehensively in industrial enterprises with complicated production processes. Run the dynamic system efficiently by adopting variable frequency technology, introducing energy-saving equipment and processes, and treating the cooling water pipe system against erosion and deposition.