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Optimization of pump settings to reduce system energy consumption CAI Qilin, School of Architecture, Tsinghua University Abstract: This paper discusses the system modes, regulating methods and control strategies of energy-saving from the function of water pump in district heating system.It is proposed to optimize the setting of water pump in the system to reduce the system pressure Level and save the total power consumption of the system pump; the use of hierarchical Burgundy method to adjust the temperature of water supply to achieve low-power operation of the system and its corresponding computer monitoring strategy. Keywords: heating system; optimize pump settings; variable flow operation; system Energy consumption; monitoring strategy 1 Foreword December 8, 2005 Ministry of Construction and other eight ministries << on further promoting the views of urban heating system reform >> stated: 'adhere to the principle of environmental protection and energy conservation, and strengthen awareness of conservation and vigorously promote building energy efficiency and System energy conservation and reduce energy consumption "is a basic principle for the development of heating for our future development and transformation of the Central Heating pointed out that the rapid development of China's central heating, but the energy consumption of production and transportation is still relatively high. In the transport area , Large flow rate, small temperature difference, high consumption of operating mode of ubiquitous, I last year on the scene to understand a square meter heating surface Recycled water up to 7 kg / h, about three times the normal situation, the pump power consumption can be imagined.For hot water heating, the heating costs of heating units, in addition to purchase heat (boiler room Therefore, adopting advanced and applicable technology to design and reform the pipe network system to fully tap the potential of system energy saving, especially reducing the pump power consumption, is an important way to save energy. In recent years, some heating companies, some users set the terminal pressure pump to reduce the circulating pump head: the user set the terminal pressure pump instead of the relay pump; to set the terminal pressure pump to increase the user pressure head, etc., have been made Reduce investment, improve the hydraulic conditions and reduce the energy consumption of the pump system. In previous years, Mongolia to use international financing large-scale transformation of the heating system, extensive use of end-user mixed-water circuit technology to expand the heat network temperature difference in order to reduce system energy consumption It can be seen that the setting of the water pump in the scientific and optimized system plays an important role in reducing the energy consumption of the system, and only some opinions on the energy saving of the water pump setting and operation regulation in the system are given below. Set and function by purpose, the heating system set the pump shown in Figure 1: l-- circulating pump 2 - water relay pump 3 - backwater relay pump 4 - user pressurized pump 5 - l_ Replenishment pump 6 - User mixed water pump 7 - Hot water mixed water pump 8 - Heat mixed water pump Figure l Heating system pump settings Figure 2.1 Circulating pumps: generally installed in the heating plant (for the secondary network is a thermal station) Located on the main pipe at the inlet / outlet of the heating equipment (boilers or heat exchange equipment), it drives the entire system of heating medium to circulate and distribute heat to the user's main power plant through the pipe network (1 in Figure 1). Installed in the import of the main pipe, heating equipment, high pressure (high pressure system point), but the pump low temperature (the system backwater temperature); installed in the export of the main pipe, heating equipment, low pressure Of the low pressure point), but the pump temperature high (water temperature system.) Circulating pump flow and lift with the expansion of the heating increases, the pressure on the hot network also will increase .2.2 heat network relay (pressure) Pump: According to the heating system hydraulic conditions, set in the main heat pipe network (booster) pump. Circulating pumps in series with the drive all System heating medium circulation, and through the pipe network to distribute heat to the user. Set in the system of water supply Fengdu Road pump called the water relay (pressurized) pump (Figure 1, 2); set in the system back to the main water pump (3) in Figure 1. Setting the relay (pressurization) pump can reduce the head circulation of the main circulating pump and reduce the pressure level of the hot network. Reasonable setting of the hot-wire relay (pressurization) pump , Which can effectively reduce the running power consumption of the pump system.According to the theoretical analysis, it is concluded that setting the heat net relay (pressurization) pump to reduce the power consumption coefficient of the system is l ~ 0.5, that is, if the heat net relay In the no-load (no heat load on the upper part of the heat network), its running power consumption coefficient of 1, does not save running power consumption: If set in the non-load (the upper section of the user heat load) The system operating power consumption coefficient is less than 1 and decreases as the number of relayed (pressurized) pumping stations increases. 2.3 Replenishment pump: To maintain the heating system at constant pressure at a set point, replenish the heating system Heating medium pump (5 in Fig. 1). In any condition F keep the system pressure steady so that no part of the heat network is vaporized, not emptied, not empty Bad heating equipment, to ensure safe heating .2.4 Terminal pressure pump: set in the user (heating station or heating system) into the El supply / return pipe to enhance the user differential pressure pump (Figure l, 4) . When the system is not enough circulating pump head leading to the end of some users lack of heat, set up in these users at the pump, to reduce the loop line characteristics, improve user funding head, can be a good solution User funding head pressure is not enough to cause the hydraulic imbalance; This technical measures and replacement of high-lift pump compared to reduce the transformation of capital and save system operation power consumption. Optimization of circulating pump and terminal pressure pump configuration is the new energy-saving system System mode (described below) 2.5 Mixed water pump: In the heating system, for the extraction part of the water (backwater) and backwater (water) to enhance (reduce) into the water temperature of the pump equipment commonly known as mixed water pump. : Set at the user (heating station or heating system) entrance, with some of the backwater and water supply to reduce the water temperature of the user system water pump called the user system mixed water pump (Figure l 6) .User system water pump can improve hot network operation Water temperature, increase its temperature , To reduce the energy consumption of circulating pump units for heating.At the same time, for the existing pipe network can increase the amount of heat for the new design heat network can reduce the construction investment.Hot net mixed water pump: set in the heating network circulating pump near the suction inlet Backwater connection pipe, used to extract part of the backwater and heat water supply to reduce the hot water temperature of the water pump network called hot water mixed with water pump (Figure l in Figure 7.) Hot water network mixed water pump heat source can make the water temperature is higher than the heat network Water temperature, reduce the water resistance of heat source equipment, reduce the power consumption of circulating pump operation Heat source mixed water pump: Set in the heat source (hot water boiler or the first station) import and export of connecting pipe for extracting part of the heat source water supply and heating network backwater mixing, To increase the temperature of the heat pipe into the heat backwater temperature of the water pump water pump known as the heat source mixed water pump can increase the temperature of the system into the boiler backwater so that the boiler inlet temperature higher than the tail to prevent corrosion temperature and improve boiler life. Thermal System Mode 3.1 Simple Heating System Mode Only the circulating water pump and makeup water pump heating system mode are set in the heat network, which is currently the most used one in our country. The mode is based on the resistance loss of the most adverse loop Including the pipeline, accessories, heating equipment) plus user capital pressure head as the head of the system to choose the circulating pump; circulating pump set in the return pipe, make-up pump constant pressure point set in the circulating pump suction near its features are: (1) The system pressure depends on the value of the head and the constant pressure point of the circulating pump, the pressure of the system increases with the expansion of the scale; (2) In the case of no perfect regulating equipment (such as balancing valve, self-operated flow regulating valve, Valve, etc.) conditions, the prevalence of hydraulic imbalance, and with the expansion of the system and serious, resulting in energy waste and affect the quality of heating; (3) to solve the majority of users in the system there is too much pressure on the issue of capital, In the user entrance to improve the regulation and control equipment, to increase the user's throttling method to achieve the resistance of the user loop balance, which not only increase capital investment, but there is a potential energy waste of circulating water pump.3.2 end-user pressurized heating System mode In the heat network not only in the heat source set circulation pump and makeup pump, but also part of the user entrance is also set terminal pressure pump heating system mode.This mode of transmission and distribution by the circulating pump and the end Pressure pump in series to complete, the sum of both lift equal to the total resistance loss of the system, the terminal pressure pump can be installed in the water supply or return pipe.Compared with the first mode has the following advantages: (1) (2) As the user's loop resistance is basically the same or a small difference, the system does not appear after the initial adjustment of hydraulic imbalance, to avoid energy waste and improve the quality of heating; (3) due to All part of the user terminal pressure pump flow is less than the sum of the circulation pump, each terminal pressure pump lift less than the system resistance need to make up the lift value (the most unfavorable loop user terminal pressure pump lift), reduce the system (4) If the terminal pressure pump with variable frequency speed pump, it directly adjust the heat load, you can not set the electric control valve to simplify equipment configuration and reduce investment.3.3 end-user Mixed heating circuit heating system mode In the heating network not only in the heat source set circulation pump and makeup pump, but also at the user entrance to set the user system mixing pump heating system mode.This mode directly connected to the heat network points The system that two fluids do not separate and the hydraulic conditions are separated, namely, the end-user heating system and the heating network operate under different working conditions (for example, the heating system of the user is a constant-flow regulating operation mode and the heating grid is a variable-flow regulating operation mode); Depending on the pressure head of the user, the mixing pump at the terminal is installed along with the pipe, or the inlet water supply pipe, or the inlet return pipe, and the head of the mixed water pump must overcome the resistance of the end user system. Compared with the first mode, (1) Has the function of connecting with the heater, but does not need the heat exchanger and make-up water pump. It takes up less land and less investment. (2) The temperature difference of the heating network is large, and the circulating water that delivers the same heat to the user is small. Low investment, low running cost and low thermal cost; (3) Because the hydraulic user's working conditions are independent, the operation parameters and adjustment mode of each user's system can be determined by themselves without generating hydraulic imbalance and avoiding energy waste Improve the heating quality; (4) mixed water circuit suitable for heat load in 2Mw below the end user .3.4 set relay pump and bypass fixed pressure heating system mode in the heat network not only in the heat source set circulating water pump And make up the pump, and dry The middle of the tube set heat network relay pump, and the system constant pressure point is not set near the inlet of the circulating pump, but set in the bypass pump inlet and outlet bypass pipe.This mode of flow distribution by the circulating pump and the Following the completion of the pressure pump in series, the sum of the lift of the two is equal to the total resistance loss of the system, and the relay pump can be set on the water supply or (and) backwater trunk according to the actual needs. The advantages compared with the first mode are as follows : (1) As the circulation pump head decreases, the system pressure decreases; (2) Bypass pressure control can make the move