Study On Energy Conservation Of Pump Network For Recirculating Cooling Water System

Recirculating cooling water system is widely used in petrochemical and other industries.Transportation of recirculating water requires the pump network to supply energy.This process consumes a large amount of electric energy,and it is easy to cause a waste of energy.Reducing the power consumption of pump network has become a hot topic in the study of circulating cooling water system.In this paper,the method of using a parallel pump network composed of different sizes of pumps in the circulating water system which quantity of water supply changes periodically is proposed.With the flexibility of this kind of pump network,system can operate with higher efficiency and reasonable heads at different water supply quantities.The minimum water supply pressure head as a constraint in the transformation process is used to help select the program.A circulating water system is used as an example,transformation results show that the total system power consumption can be reduced by 1.2%.This kind of transformation way is suitable for circulating water system with a large amount of water supply.There is no obvious regularity in energy saving and the amount of change in water supply.The method of adding auxiliary pumps in the circulating water system is analyzed deeply.Explored the pressure distribution of the system,and the position of the minimum point of the circulating water pressure is found.Then put forward the constraint conditions for carrying out the transformation.Explained the concrete steps and scheme selection methods.A circulating water system is used as an example,transformation results show that the total system power consumption can be reduced by 28.32%,which has a good energy-saving effect.This paper discusses the dual transformation,which contains the method of using a parallel pump network composed of different sizes of pumps and adding auxiliary pumps in a circulating water system pump network.The priority of these two transformation ideas is analyzed,and the latter’s priority is higher than the former.It is necessary to discuss the transformation of adding auxiliary pumps first,and then the size of the pumps can be selected according to the needs of the new water pressure heads.Aiming at the optimization goal of operation cost,the specific steps of the dual transformation and transformation program’s determination is proposed.A circulating water system is used as an example,transformation results show that comparing the pump network only for adding auxiliary pumps,the energy saving has improved after carrying out the dual transformation.The total system power consumption can be reduced from 27.74% to 35.53%,and the energy saving effect is excellent.