Research On Power Consumption Of Distributed Heating System

One of the outstanding problems in China’s current heating field is that the technology lags behind the demand.With the acceleration of urbanization and the increase of heating scale,energy saving and consumption reduction has become the primary task of heating technology research.The present domestic research mostly focused on the energy performance of distributed system overall system energy saving situation,in order to further improve the system efficiency,do cut in energy saving,puts forward corresponding energy saving measures,will be more comprehensive understanding of the source of power and influence factors,this topic in system power consumption situation as the research content,from the perspective of system power consumption for distributed pipeline heating system is the study of many aspects.This paper firstly analyzes the distributed system principle,system form,system composition and system operating conditions,summarizes the installation location and application characteristics of the pumps in the two-stage pump system,three-stage pump system and three-stage pump mixed water system,and summarizes the functions of different components of the system and the effect of the system operating hydraulic conditions.Secondly,with the help of trangen theorem,a theoretical model of water pump power consumption is established,the principle of water pump variable frequency power saving is expounded,and the power consumption index of the system is determined.Finally,based on an engineering example of a residential area in xi’an and taking the heating system as the research object,the models of centralized system and distributed system are established respectively,and the calculation of installed power consumption and variable flow operation power consumption of a heating season system is carried out.Research results show that the distribution of heat pump heating system,are distributed along the pump and the mixed water pump power consumption accounted for 15.48%,74.85%and 9.67%respectively,compared with the centralized system total installed electricity quantity of 40.7%,run electricity quantity of 81.26%,use the static evaluation method in engineering economics and to repay the life method for comparing two systems research,to adopt pump power frequency and variable frequency pump centralized system to repay the duration of 2.3 years and 6.62 years,respectively,and the economic benefits of a distributed system with increasing age begins to show.In addition,on the basis of the original project,the project scale is changed,and the installed power consumption and operation power consumption of the system under different heating scale are studied.Finally,the influence factors of system power consumption are studied in detail based on an engineering example,and the influence of water mixing rate and water replenishment rate on the system is analyzed.Every 1%increase in the water replenishment rate of the heating system is equivalent to the ineffective waste of 0.6%of the heating quantity of the system.The heat loss can be reduced by 93.92kW for each degree of reduction of the return water temperature,that is,the temperature difference between the return water temperature and the make-up water temperature.In addition to study the influence of network on along the pump effect,including pipeline buried depth,thermal insulation layer thickness,diameter,for the return water temperature,backwater temperature,heating radius,summarizes and induces certain regularity and application experience,as well as the back pressure and zero pressure came close to the location of the energy saving effect of the system were analyzed to discuss,for the heating system of distributed transmission further promotion and application to provide the reference.