Application Of Equalizer In Heating System And Numerical Simulation Of Its Parameters

In China,for a long time,the vast majority of central heating system in cities and towns has used a single heat source to supply heat by constant flow control.The connection of thermal network and users is direct;later,the multiple heat source supply heat,the indirect connection of thermal network and users and the installation of water mixing devices in direct heating system have arisen.In recent years,applications such as the speed control water pump and the distributed water pump in heating system have promoted the development of heating technology in China.The pace of heating technology development is precisely the step exploration of China in improving the quality of heating,improving the operating conditions of the pipeline network and achieving energy conservation and emission reduction.Although the heating technology continues to advance,the problem of uneven heat distribution,large energy consumption of circulating water pumps and the effect of the thermal network's hydraulic stability that caused by self-regulation of the thermal users is always existed.How to improve the hydraulic stability of thermal network,how to use heat energy effectively and reduce energy consumption and how to fundamentally optimize the heating system operation is the focus of the current heating research.The equalizer is a new type of heat exchange equipment that appears under this condition.Applying it to the heating system can effectively improve the hydraulic imbalance of the system and reduce the energy consumption of the pump.Firstly,for this new type of heat exchange equipment,this paper introduces the structure,principle and simple thermal properties of the equalizer.Five kinds of heating schemes were established for traditional direct-connected heating system and the system with equalizer.For the five schemes,by comparing the total energy consumption of the circulating pumps,the pressure consumption of the control valves and the hydraulic stability of the system,get:?1?Compared with the traditional direct-connected heating system,the total energy consumption of the circulating pump for the system with equalizer can save up to 40%.?2?The heating system with equalizer can indeed improve the hydraulic stability of the heating network.When the secondary side of the equalizer independently adjusts the flow,the operation condition of the primary heating network and other heat users will not be affected.?3?For the heating system with equalizer,the pressure consumption of the control valves is small,and the energy efficiency of the circulating water pump is relatively high.Then,based on the FLUENT software,this paper examines the effects of single factor?thermal load,equalizer diameter,Spacing ratio of the pipe on the opposite side and center distance of the pipe on the same side?to the temperature deviation of the equalizer.The two temperature deviations are related to the secondary side water supply and the primary side water return of the equalizer when it is placed horizontally.Finally,this paper aims to find the optimal parameters of equalizer when it is placed horizontally,which selects the process parameters and structural parameters of equalizer as the influencing factors of the test and uses orthogonal test method to simulate different equalizer models.Through the analysis of the orthogonal test results,it is found that:?1?For the secondary side water supply deviation,the order of each factor's influence is:thermal load>equalizer diameter>center distance of the pipe on the same side>Spacing ratio of the pipe on the opposite side,the optimal level combination is:thermal load is 720kw,equalizer diameter is 3.5d₁,Spacing ratio of the pipe on the opposite side is 2/8,center distance of the pipe on the same side is 2d₁;For the primary side water return deviation,the order of each factor's influence is:equalizer diameter>Spacing ratio of the pipe on the opposite side>thermal load>center distance of the pipe on the same side,the optimal level combination is:thermal load is 240kw,equalizer diameter is 2d₁,Spacing ratio of the pipe on the opposite side is 2/8,center distance of the pipe on the same side is 4d₁;?2?Through the simulation verification of the two optimal combinations,we obtains a relatively favorable parameter value:equalizer diameter is 3.5d₁,Spacing ratio of the pipe on the opposite side is 2/8,center distance of the pipe on the same side is 2d₁.