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Central heating heating network circulating pump energy saving 70% technical methods
Abstract: This paper discusses the energy-saving effect of 70% energy saving of circulating water pump and the adjustment tool to realize "quality and adjust" operation mode of central heating "quality and adjust" operation mode --- self-operated resistance balancing valve The principle of the type of resistance balance valve and the use of self-balancing resistance valve heat network to adjust the basic process. Key words: quality adjustment, quality control and mass adjustment, balance valve, self-operated flow control valve, self-operated differential pressure control valve, self-operated resistance balance valve, initial adjustment and operation adjustment. As we all know, due to the characteristics of the heating system itself, under the premise of ensuring the best heating quality (indoor temperature is not too high nor too low), for a given heating system, at different outdoor temperatures, there is a Corresponding to the best circulation flow and the best temperature (temperature difference). Therefore, the best way to adjust the operation is the "quality" and "quantity" of the comprehensive adjustment, that is, in the regulation of heating operation, according to changes in outdoor temperature, both to change the circulating flow and change the water temperature. This quality adjustment, on the one hand to achieve the best heating effect, on the other hand reached the maximum to reduce heat and power consumption. However, due to the "quality and adjust" mode of operation there is difficulty in balancing the heat network, so although in recent years many domestic heating enterprises in the first and second heat network implementation of circulating pump frequency control variable flow operation, "quality "And" quantity "and adjust the project practice more, but the actual operation is not satisfactory. The concrete manifestation is that the change of the flow rate is not big, can not drop down, and the running flow is mostly higher than the calculated flow under the design state, which is far from the parameter state of achieving the best adjustment working condition. The circulating pump frequency control speed regulation Become a means to solve the equipment of the horse-drawn car, heating system energy saving potential is not really tapped out. The most fundamental reason is that the lack of a simple and effective means of adjusting the heat balance hinders the popularization and application of the "quality and adjust" operation method. This paper will explain the energy-saving effect of "quality and adjust" mode of operation, and introduce the principle and application of self-acting resistance balance valve . 1, "quality and tune" mode of operation of energy-saving effect: Changchun City, Jilin Province, for example, Changchun City heating period is 165 days, a total of 3960 hours, according to data from many thermoelectric companies, Changchun City, the design of outdoor temperature The actual consumption of heat indicator is about 52 kcal. See Table 1. 1.1, the entire heating period does not change the flow of mass adjustment mode of operation, circulating pump consumption flow is 100%, circulating pump consumption of electricity is 100%. 1.2, if the use of quality control mode of operation to change the flow step by step, the heating period can be divided into three stages: the first 50 days of cold, circulating flow by 80%; 50 days of the end of the cold cycle, circulating flow by 80% Cold period of 65 days, the circulating flow at 100% operation. The flow ratio used by the actual flowrate and pure qualitative adjustment operation mode is: (80% * 50 + 100% * 65 + 80% * 50) /165=87.9% The circulating pump According to the formula: The proportion of the power consumption of the circulation pump adopting the quality-adjusted operation mode of changing the flow in stages and that of the pure-quality operation mode are respectively as follows: The initial cooling-off period: N1 = 51.2% Cold period: N1 = 100% Winter period: N1 = 51.2% 1.3 When adopting the mode of "quality and adjustment", different circulating flow rate is adopted according to the outdoor temperature. The mass flow ratio used in purely qualitative mode of operation is: 2606 / (3960 * 100%) = 65.81% According to the formula: The ratio of the power consumption of the circulating pump with the "quality and adjustment" Is: N1 = (65.81%) 3 = 28.5% As can be seen from the above analysis: When using a simple qualitative adjustment operation, the circulating pump power consumption is 100%; when using a phased Circulation pump power consumption is 70.4%, energy saving is 29.6%; when using the "quality and tune" mode of operation, the circulating pump power consumption is 28.5%, power saving is 71.5 %. See Table II. Although there may be some differences between theoretical calculation and actual engineering, it is enough to show that the energy-saving effect is considerable. Its significance lies not only in saving the heat company cost and increasing profits, but also making due contributions to the country's energy conservation and emission reduction and the improvement of the global environment so as to make contributions to the benefit of future generations. Project quality control phase change flow quality control quality and adjust the power consumption 100% 70.4% 28.5% Power Saving 100% 29.6% 71.5% 2, Self-acting resistance balancing valve Currently, adjustable for heat network with adjustable The hydraulic components are mainly balanced valve, self-flow control valve, self-operated pressure control valve. Among them, self-operated flow control valve has a constant flow characteristics, the target of regulation is flow, the most suitable for qualitative adjustment mode of operation, the disadvantage can not be applied to the "quality and tune" mode of operation; Temperature control valve supporting the use of, suitable for heat metering system, the characteristics of the heat metering system is the user active variable flow and thermal company passive variable flow system, due to various reasons can not be widely promoted; balance valve regulation goal is to balance the resistance, The manifestation is flow balance, so a heat network system, which theoretically uses balance valves for balance adjustment, can be adapted to the "quality and tune" mode of operation. However, the balance valve is poorly adjusted for large-scale pipe network systems, the balance effect is poor, the mediation process is too complicated, and users rarely use it. In order to make the "quality and tune" this significant energy-saving heating operation has been widely promoted, it is necessary to invest one is not high, energy-saving effect, good balance of hydraulic regulation products. Mr. Liu Zhaojun engaged in hydraulic balance for many years, after repeated research, and finally invented a self-balancing resistance valve, self-balancing valve resistance self-flow control valve and balancing valve to absorb their own advantages, to make up for their shortcomings, completely suitable In the "quality and tune" mode of operation, applicable to all sizes of primary and secondary networks. To understand the self-force balancing valve, we must first clear the hot net hydraulic characteristics. 2.1, heat network hydraulic characteristics formula: heating system in the hot network of users in general are in parallel. According to the characteristic formula of parallel network: △ P = S · V2 △ P = S1 · V12 = S2 · V22 = S3 · V32 = ... Got the parallel network V1: V2: V3 ... = 1 /: 1 /: 1 / ... Wherein V1, V2, V3, respectively, that the parallel section of pipe 1,2,3 flow, m3 / h; where S1, S2, S3, said the parallel section of pipe 1,2,3 drag coefficient, Pa / (m3 / h ). According to the above basic formula, the following conclusions can be drawn: 1. For a hydraulic component and pipe section, the square of the flow and the pressure drop across it are proportional as long as its specific structure does not change. 2. When the resistance of each branch pipe in the parallel pipe section is constant (that is, the value of the resistance coefficient S), that is, when the resistance coefficient of each hot user in the heating system is constant, how many times the total network traffic increases or how many times decrease, How many times or decrease the traffic of each hot user in each branch pipe section in the pipe section, that is, the heating system, should be correspondingly increased? 3. When the resistance condition of any branch pipe section in the parallel pipe section changes (ie, the resistance coefficient S value), the total drag coefficient of the network inevitably varies with each other, and the proportion of the total network traffic flow in each branch pipe section is correspondingly Change. Based on the above formulas and conclusions, we can deduce the following conclusion: After the resistance coefficient of a certain point in the heating network changes, the pipe section (ie, hot user) in front of this point will have a disproportionate change in the flow rate; Pipe segment (that is, hot users), traffic will show a proportional change. According to these hydraulic characteristics of heating pipe network, when a heating system adopts quality adjustment mode, the variable speed operation of circulating water pump is equivalent to the change of the resistance condition (ie, the resistance coefficient S value) of the total outlet of the heating net, Circulating pump outlet after the hot user that is all the hot users, the circulation flow will be a proportional change. Heat network through the initial adjustment to achieve the resistance balance, the pipe network on each branch, the user valve is no longer operating, its opening is fixed (all hot user loop resistance coefficient constant), heat network total flow and then change how much change, Each user traffic online also increase or decrease the number of changes in the same proportion, without changing the original balance. 2.2, Self-acting resistance balancing valve works: The production retained in the self-flow control valve automatic adjustment orifice, differential pressure automatic balancing mechanism, manually adjust the orifice, the pressure control feedback pipe, set the flow of Scale scale and other structures based on the increase of locking devices and pressure detection hole. The valve does exactly the same function as a self-acting flow control valve without a locking mechanism - a constant flow function. In the initial stage of heating network, the locking device is fully opened, the valve is adjusted by the self-operated flow control valve adjustment method, the heat user's flow quickly reaches the equilibrium state, and the self-operated flow control valve is exerted on the heat balance control Advantage. The lock is then activated and the valve becomes a counterbalance valve with variable flow capacity. As each hot user balances, circulating pump and then change speed, the user traffic will be a proportional change, still maintain the balance. Constant flow control valve constant flow and balance method of variable flow, two functions can be converted according to specific needs. Pressure measurement hole used to measure the valve inlet and outlet pressure, and under the state of the flow under the state of the actual flow to calculate the corresponding state of the resistance and resistance factor, the performance of the designer for hydraulic balance project design and operation of the analysis staff The pressure, flow, resistance situation provides a simple and accurate tool. 2.3, Self-acting resistance balancing valve general application: As shown in Figure 1, during the initial adjustment of the resistance balance, the first locking mechanism, the use of self-balancing resistance valve constant flow function, the flow of 5 hot users according to the design Flow regulation is good, at this moment, the flowrate of 5 heat users is balanced, the resistance (resistance coefficient) of 5 heat user loops in this flow state is balanced too. At this point, the use of self-acting resistance balancing valve locking device, which is locked five thermal users in this flow equilibrium state of resistance equilibrium (ie, five thermal user loop resistance and drag coefficient), due to the heat The user's resistance coefficient at a more accurate level