Hydraulic Characteristics Analysis And Operation Regulation Of Distributed District Heating Hot Water System

Along with economic development and the improvement of people’s living standard, the urban central heating has grown into an important part of municipal public utilities, heating pipe network hydraulic balance and running regulation is becoming a hot spot of research.This paper introduces the basic knowledge of graph theory, and the main equipment such as pipeline network of water pump, heat exchanger, the regulator model respectively, using the kirchhoffs law and pipeline characteristic equation, the working condition of central heating pipe network hydraulic computation model was established, with the improved square root method for solving.Then, in view of the town of hot water of central heating pipelines or common hydraulic disorder and caused by the thermal imbalance and mutual influence between the user of the network, this paper proposes a new operation mode, namely the differential pressure at the ends of pipe is fixed value operation mode.With the end user of the differential pressure value by working backward pipeline characteristic equation, the heat pump lift is deduced.Based on Matlab development platform to establish the operation mode under the hydraulic model and analyzes the hydraulic characteristics, and with the pump head for setting the operation mode of hydraulic characteristics comparison, found that the constant pressure difference at the end of the pipe network operation mode can be very good to alleviate the network interaction between each user:when a user’s valve regulating network, adjusting valve hydraulic characteristics of the user is not affected, the regulating valve in front of the user as close to the adjustable valve, the smaller the impact.Secondly, based on the working condition of central heating pipe network hydraulic computation model analysis of hydraulic characteristics of distributed pump heating system.Pump for several different forms of distributed heating system and traditional heating system, using laingen law respectively calculate the water pump power consumption, it is concluded that the former is the latter has the energy saving effect, and the source of heat pump set alone, the unity of pump and pump and heat users system form is the most energy-efficient, worthy of promotion and application in practical engineering.Finally, in view of the current urban development and the present situation of the large complex hot water round the central heating pipe network is very common, based on the above model analysis, the most unfavorable loop calculation model is set up, first run to draw the pressure of each node and pipeline section flow value, there are many simplified branch in one of the most unfavorable loop, and then in turn set up branch of the simplified model, to run the program until obtaining for hydraulic characteristic value of the secondary station.Network basic data input through the form of Excel spreadsheets, flow rate and pressure drop are node pressure, pipe section of pipeline network using Excel line chart and table format output.Through the layered idea to handle large complex pipe network, can get ideal result.That network layered ideas for solving large-scale complex networks simulation analysis is the effective method.