Analysis of dual frequency non-interference switching system of circulating fluidized bed boiler fan

Abstract: Analysis information of circulating fluidized bed boiler fan dual-frequency non-interference switching system is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 0 Introduction With the continuous in-depth development of the Comprehensive Work Plan for Energy Conservation and Emission Reduction in the Twelfth Five-Year Plan, my country's electric power, steel and other industries strictly adhere to the combination of reducing energy consumption intensity, rationally controlling the total energy consumption, and promoting technological progress. increase in magnitude. For more flowmeter manufacturers to choose models and price quotations, you are welcome to inquire. The following is the details of the analysis article on the dual-frequency non-interference switching system of circulating fluidized bed boiler fans. 0 Introduction With the“Twelve Five”The Comprehensive Work Plan for Energy Conservation and Emission Reduction has been carried out in depth, and my country's electric power, steel and other industries have strictly followed the“Adhere to the combination of reducing energy consumption intensity, rationally controlling the total energy consumption, and promoting technological progress to greatly improve energy utilization efficiency”policy guidelines, and actively implement energy conservation and emission reduction measures to contribute to sustainable development. Shandong Weihai Botong Thermal Power Co., Ltd., as the main heating unit of Weihai Economic and Technological Development Zone, provides steam for production and undertakes the central heating task of nearly 5 million square meters for more than 130 enterprises and institutions in the area. The company has two 130t/h and one 220t/h boilers as the main boilers, which undertake most of the heating and heating tasks. However, due to the shortcomings of the traditional design scheme, relying on the wind baffle to adjust the wind pressure leads to a large amount of energy consumption and a serious waste. In order to actively respond to the call of national policies and improve comprehensive economic benefits, Shandong Weihai Botong Thermal Power Co., Ltd. has carried out frequency conversion and speed regulation transformation of fans. 1. Necessity of the reformation of the flue gas fan system of the circulating fluidized bed boiler First of all, the speed regulation operation of the fan was not considered in the initial stage of the boiler investment. The fan runs at a constant speed, and the wind pressure is completely adjusted by the air baffle. The adjustment and control characteristics of the baffle are poor, and the pressure loss is serious. The baffle is open at 30%~80% for a long time, and the system efficiency is low, resulting in high power consumption in the plant. The power consumption of 130t/h furnace ton of steam reaches 9~10kWh/t, and the power consumption of 220t/h ton of steam reaches 11~12kWh/t, resulting in a great waste of energy. Secondly, the traditionally designed primary fan, secondary fan and induced draft fan use the opening of the inlet restrictor (or baffle, damper) to adjust the pressure. Since the general design air volume and air pressure are required to have a larger design margin than the rated operating conditions, the general fan and motor selection are too large, so the actual air door opening is 30%~80%, resulting in the fan often working at a low efficient area, wasting a lot of energy. Thirdly, the linearity of the air volume adjusted by the damper is not good. When adjusting the damper opening, it often occurs that the opening degree changes little but the air volume changes greatly. It is difficult to achieve the automatic combustion required by the precise air volume ratio, which affects the circulating fluidized bed. The operating efficiency of the boiler. Therefore, the application of frequency conversion speed regulation equipment to the fan of the circulating fluidized bed boiler can reduce the power consumption rate of the unit, and due to the excellent characteristics of the frequency converter speed regulation, its application can lay the equipment foundation for the automatic control of the boiler unit. In terms of energy saving and operation management, the operating cost of the unit is reduced. 2. Energy-saving principle of high-voltage frequency converter speed regulation technology The frequency conversion speed regulation of asynchronous motors is achieved by changing the synchronous speed by changing the stator power supply frequency f. In the speed regulation, a small slip rate can be maintained from high speed to low speed. Therefore, the consumption of slip power is small and the efficiency is high, which is the most reasonable speed regulation method for asynchronous motors. It can be seen from the formula n=60f/p(1-s) that if the power supply frequency f is changed uniformly, the running speed n of the motor can be changed smoothly. Variable frequency speed regulation of asynchronous motors has the advantages of wide speed regulation range, high smoothness and hard mechanical characteristics. At present, variable frequency speed regulation has become the most important speed regulation method of asynchronous motors, and has been widely used in many fields. For centrifugal fans, the fluid mechanics has the following principles: the output air volume Q is proportional to the speed n; the output pressure H is proportional to the square of the speed n; the output shaft power P is proportional to the cube of the speed n. Namely: Q1/Q2=n1/n2; H1/H2=(n1/n2)2; P1/P2=(n1/n2)3. When the air volume of the fan needs to be changed, such as adjusting the opening of the damper, a large amount of electric energy will be consumed in vain on the resistance of the valve and the pipeline system. If the frequency conversion speed regulation is used to adjust the air volume, the shaft power can be greatly reduced with the decrease of the flow. In frequency conversion speed regulation, when the fan is lower than the rated speed, the theoretical power saving is: E=(1-(n′/n) 3)×P×T where: n is the rated speed, n′is the actual speed, P is the motor power at the rated speed, and T is the working time. It can be seen that the transformation of the fan by frequency conversion not only saves energy, but also greatly improves the operating performance of the equipment. The above formula provides a theoretical basis for frequency conversion energy saving. 3 Implementation plan for the technical transformation of dual-frequency non-disturbance switching of boiler fans Since the three boilers of Shandong Weihai Botong Thermal Power Co., Ltd. are all single fans, that is, each boiler is an induced draft fan, a primary fan, and a secondary fan, and there is no backup. The outage of any fan will cause the shutdown of the boiler. In order to avoid the normal operation of the boiler due to the unstable operation of the inverter, the boiler DCS system was reconfigured and seamlessly connected with the inverter. After many cold and hot state tests, the boiler DCS system was combined with the high-voltage inverter. Together, the function of automatic two-way switching between frequency conversion and power frequency is realized, and the non-disturbing switching is truly realized.

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