Abstract
The aim of the work is to improve the energy efficiency of heating boiler plants by reducing the spe-cific electric energy consumption for heat supply by using the variable-frequency drive (VFD) with different methods of heat supply regulation. Hydraulic and thermal calculations of the heating net-work are performed on the example of the real district heating system. Heat network temperature charts of district heating are selected and calculated considering preservation of high quality of district heating. The description of the calculation algorithm of the research and the results of the calculation of the basic mode of district heating heat supply according to the standard temperature chart of varia-ble temperature control are given in the article. Places of installation of VFD are determined on the base of the basic mode. The results of calculation of three different methods of heat supply regulation are presented: standard heat network temperature chart of variable temperature control with using the VFD, extended heat network temperature chart of constant temperature/variable flow control, extend-ed heat network temperature chart using the VFD.
Highlights
The main centralized sources of heat in Russia are combined heat and power plants (CHP) and heating water boiler plants
There is a reserve of energy saving in almost every boiler house [2, 3]
Regulation is carried out by throttling in valves, or by means of control valves [6, 7]. Such regulation is costly in terms of power consumption and equipment life due to large loss of hydraulic and, electri-cal
Summary
The main centralized sources of heat in Russia are combined heat and power plants (CHP) and heating water boiler plants. The efficiency of heat energy production in a boiler house and transportation of heat carrier in the heat network is determined by the possibility of controlling the heat carrier parameters at all stages with the least losses, as well as the technology and equipment used [4,5]. Regulation is carried out by throttling in valves (which is prohibited), or by means of control valves [6, 7]. The demand for the transition to an adjustable electric drive of the boiler house equipment, first of all pumps, is very high and this problem is urgent [10,11,12,13,14,15]
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