Application Of Equalizer In Heat-Supply Project And Numerical Simulation

Since 2006, China has accelerated the pace of reform of heating supply measurement, the government has issued a lot of regulations to extend household metering.it need to measure the quality of heating on the premise that we can meet the personalized needs of heat users.But in recent years, China’s central heating still has a lot of problems such as the heat users is uneven in the place far or near, the circulating pumps of Large flow, large power have a excessive energy consumption, mutual interference of the users’ regulation makes the regulation and control strategy very complex.All of the problems are greatly restricting the reform of central heating. So how to improve the hydraulic stability of heating network, how to reduce energy consumption, how to provide corresponded hardware conditions for the reform of heat metering become a subject of extensive researchThe equalizer is composed of a cylinder body, the supply and return pipes on the both sides. The cylinder body connects the supply and return pipes of the primary network(External network) on one side,and connects the supply and return pipes of the secondary network (users Internal network) on the other side.There have been a lot of years of history since the equalizer is used in heating system.But in China, it is in a stage of development. This paper introduces the principle, structure and hydraulic characteristics of the principle,and with the use of the secondary pump, Installed in the user thermal entrance,to Improve the user’s independent regulation ability, By separating the user and the network, make the network operating with a larger temperature difference, smaller flow rate.In the other side of the equalizer,the user Using the mode of operation of "high flow, low temperature difference".Compared with traditional network,it has advantages in energy saving.Because of structure characteristics of the equalizer,when it is Installed on the user’s thermal entrance, user’s autonomic regulation will not impact the network flow.The user has steady flow distribution,that is very fit in the using of central heating household metering and can solve the problem of pressure shortage in the end of the network effectively.This paper also do research on the connection mode of networks users and equalizer. Through the Simulation for a variety of models by the software of fluent,and comparethe simulation results with the ideal situation, get the optimal law for the design of equalizer, which has no clear design method in China. At the same time, this paper conbines with the national policy and the development of the heating household metering reform. Combinat the equalizer with balance valve and secondary pump, establish a set of integral thermal entrance.Which has the function of balance the flow、measure the heat and self-determination regulating. The integral thermal entrance is overall designed assembled,which solve the problem of original heating chamber seepage,has a lot of advantages such as flexible combination and shape design.