Circulating water pump selection error is a common big problem, as all heating plants and thermal power plant circulating pump almost the same status quo, so few people find and attention. This is the worst place to waste electrical energy in the heating industry. According to the current national total heating area of ​​1.8 billion square meters roughly estimated that at least more energy consumption per year more than 4 billion yuan worth. Completely correct the selection of circulating pump error heating industry and the power plant an urgent major problem. If we can quickly in the national heating industry and thermal power plant to carry out a replacement of circulating pump technical measures, will save a lot of energy to the country. The main mistakes of their selection are: the pump head is too high and more than one pump running in parallel the traditional concept, resulting in electricity consumption than the actual needs, or even higher than several times. The reasons for the error are many, the main analysis of the following aspects: 1, to determine the pump head design and actual needs vary greatly Circulation pump head and the actual difference is too large, the main reason is that designers "rather big" psychology prompted them to apply the design specifications, all the "ceiling superimposed" approach, and finally by a safety factor . Others do not do hydrodynamic calculations at all, but apply similar designs; or set them irresponsibly according to their own and others' habits; and even some of them who have unclear basic heating knowledge, Also added to the circulation pump head caused. When the pump head more than the actual needs, the operation will cause the pump outlet valve can not open large, or the motor will be overloaded, while a large number of waste of electricity. Correct way to determine the pump head is: should be based on the actual situation of hydraulic calculations, rather than a rigid set of norms. Available in the following ways: First, if the design information is complete, the correct choice of operating parameters, based on the detailed hydraulic calculations to determine. Second, if the original heating system is running or has a historical record of operation, the resistance loss of each part can be calculated according to the readings of pressure gauges in different places so as to make reference to check the hydraulic calculation results to determine the head of the pump. Among them: the total pressure drop of the heat source is the total resistance loss of the outer net, the pressure difference between the inlet and outlet of the boiler or the heat exchange device is the resistance loss of the device; the pressure difference between the inlet and outlet of the pump is the lift of the actual work of the pump, Table set in front of the pump inlet valve, the pump outlet valve, the pressure difference between the two is the heating system actually needed pump head. 2, unclear understanding of the pump parallel operation conditions A lot of heating enterprises in accordance with a boiler or a heat exchanger with a pump to determine the way. They mistakenly think that the actual parameters of the pump operation should be the same as those on the nameplate. The parameters (flow and lift) on the actual pump nameplate are only the values ​​of the pump when it is operating at its highest efficiency point. The actual operating parameters of the pump is the characteristic curve of the pump and pipeline characteristics of the intersection of the decision. The actual parameters of multiple pumps operating in parallel are determined by the intersection of the characteristic curve and the characteristic curve generated by the pump in parallel. When more than one pump of the same type is working in parallel, its lift should be higher than that of a single pump, and its flow rate is generally smaller than the algebraic sum of the flow when a single pump is working. Also less than the algebraic sum of the flow of each pump's nameplate. And at this point, the actual efficiency of each pump is lower than the efficiency of the nameplate. Only when the diameter of the pipe network is coarse, the characteristic curve of the pipelines is more likely to be the algebraic sum of the nameplate flow rate. However, design time is often based on the nameplate flow algebra and to determine the parallel operation of the pump flow, so the operation of each pump are not efficient point of work, thus wasting electricity. And sometimes will not be able to meet the requirements of the system flow, thereby increasing the number of running or increase the pump model. If a unit running six pumps still can not meet the hot network traffic in the case of an additional three large pumps. 3, a variety of operating conditions simply using multiple pumps in parallel In a heating system may have a variety of operating conditions, such as: the use of quality control mode to change the flow step by step operation, will use multiple models with the same type of pump design in parallel. The solution looks superficially, but as a result each pump does not work in the high-efficiency zone, wasting power. In response to this situation, should promote a single pump operation of the program. To change more than one pump running parallel to the habit of running under any single pump program is the best design. If the heat source or heat station is a constant flow and quality control program, you should re-elect a flow and lift the appropriate pump as a working pump, the original number of pumps as a backup pump. Practice has proved that such transformation, can be recovered within 1-2 months from the savings in electricity costs. For example, there is an enterprise heating area of ​​1.8 million 3. Taiwan pump, running 6, into a pump after saving 2.8 million yuan each year. If the heat source is phased to change the flow of quality control program, choose a variable speed pump to solve. If a heat source has a variety of operating conditions, or increasing year by year system, you can choose several different types of circulating pump, depending on the conditions of departure different types of pumps. Various pumps according to the actual situation each other spare. For example, a unit of peak heat source has 6 29MW water heaters, using a small, a large, two CPC 4 sets of constant speed pump installed in parallel, under various operating conditions, only one of the pump operation, Special circumstances lucky two pumps, has been in normal operation for more than 10 years. 4, the wrong technical measures to pump more and more power Some enterprises in the heating system due to hydraulic imbalance caused by the remote user heating is not good, often do not understand the reasons for the generation of hydraulic imbalance, do not seriously adjust the network to solve the problem, but based on the heating effect of poor users The "lack of pressure" on the surface of this phenomenon, mistakenly think that the pump head is low, or insufficient flow caused. Therefore, the replacement of large flow, high-range way to solve the pump. As a result, the power of the pump is further increased. Although this method can relatively improve the heating effects of some end users, it does not solve the problem of uneven heating and cooling, but further causes a great waste of electric energy and makes the operation cost of the enterprise higher. This error has occurred in many heating enterprises from time to time, but even more regrettably, some enterprises promote it as a good experience. 5, selected by non-professional and technical staff to pump What is even more serious is the heating system of many privately-run heating enterprises or small towns that are not formally designed. Instead, they are arbitrarily determined by the boiler supplier, the boiler plant, or the installation company installer, according to their own so-called experience, or the old water pumps used elsewhere can be directly transferred. The power of these circulating pumps is far more than the actual need. 6, from the actual election according to the planned load pump For the construction or expansion of the heating system, commissioned the design, the general plan only to provide long-term heating load to the designer, not at the same time to provide designers with the size of the heat load in the near future. Then the designer will choose circulating pump model according to the planning load, but the recent heat load is often small, a few years to achieve planning. Well, in the next few years working with this pump will be a lot of waste of energy. Although sometimes the construction unit provides the designers with the load of the near, middle and far phases, the designer will design the parallel connection of multiple pumps according to the long-term load. However, the lift of the pump is determined according to the long-term load. When only one pump is used in the near future, since the pipe diameter is determined by the long-term load, the heat load is small in the near future, and the resistance loss of the pipe network will be very low and the result will appear
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