Application of New Automation Technology in Thermal Power Plant

Abstract: The application information of new automation technology in thermal power plants is provided by excellent flowmeter and flowmeter production and quotation manufacturers. With the continuous deepening of the reform of the power industry and the further implementation of the separation of power plants and grids, and the further implementation of the bidding policy, it has become the primary task of each thermal power plant to ensure the safety, stability and economic operation of thermal power generating units. Automation is the realization of the safety and economy of thermal power units. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the application of new automation technology in thermal power plants. With the continuous deepening of the reform of the power industry and the further implementation of the separation of power plants and grids, and the further implementation of the bidding policy, it has become the primary task of each thermal power plant to ensure the safety, stability and economic operation of thermal power generating units. Automation is an important technical measure to realize the safe and economical operation of thermal power units. Therefore, all thermal power plants are very concerned about the development of new automation technologies and continue to apply new automation technologies in order to reduce power generation costs, improve labor productivity, and enhance the competitiveness of factory electricity prices. Purpose.  In recent years, the development of automation technology can be said to be changing with each passing day, and new scientific and technological achievements are constantly emerging. To sum up, the application of new automation technology in thermal power plants is mainly reflected in the following aspects. 1. Application (1) Automatic detection 1 Flame image detector At present, the capacity of a single burner of large boilers in thermal power plants is very large. Therefore, whether the burner flame can be detected correctly will directly affect the furnace safety monitoring system (FSSS) Action reliability. In order to prevent the occurrence of boiler deflagration accidents, the flame in the furnace must be effectively detected. Ordinary optical detectors (such as ultraviolet flame detectors, visible light flame detectors, and infrared light flame detectors) rely on only one photosensitive element to collect the average light intensity of the flame characteristic area, and the limitation of the amount of information obtained often leads to the flame as the foreground cannot be effectively distinguished from the background. The field of view of ordinary optical detector probes is very small, and when the flame fluctuation is large (the boiler is running at low load), it will falsely report that the furnace is extinguished. Therefore, in the future, the flame image detector will replace the ordinary optical detector, which is a new trend in the development of the boiler flame detection system. The flame image detector is different from the previous industrial TV. It has the following characteristics: (1) The flame image detector uses multiple miniature cameras (CCD) to detect the burning process of each burner or each layer or each corner. In fact, it has a larger field of view than ordinary optical detectors and collects more information.  (2) The flame image detector uses a microprocessor to process the flame information, converts it into numerical form, performs analysis and operation, and displays it on the digital image display, and stores the data in the computer memory for further analysis. deal with. The industrial TV is only an intuitive image display, without information processing and memory functions.  (3) The flame image detector displays multiple processed flame images, enabling operators to understand the brightness distribution of each flame, the ignition point and the combustion condition of the entire furnace, so as to optimize combustion and reduce NOX emissions. And industrial TV does not have this function.  At present, foreign flame image detector products mainly include DPTIS type from Japan's Mitsubishi Corporation and DIMAC type from Finland. Several domestic scientific research units have also successively launched flame image detector products, which have been operated on many domestic coal-fired units, basically achieving no false alarms, and increasing the alarm speed.  2 fiber optic sensors (1) Semiconductor fiber optic thermometer  Semiconductor fiber optic thermometer uses the principle that the light absorption of semiconductor materials changes with the change of temperature to measure temperature. For example, when the temperature increases, the light energy transmitted through the semiconductor material decreases, and the measured temperature value can be obtained by measuring this change in the light energy with a photoelectric element. The semiconductor fiber optic thermometer is mainly used in the direct measurement of the hot spot temperature of the ultra-high voltage transformer, which plays a decisive role in the safe and economical operation and service life of the transformer. The insulation of the hottest spot of the transformer coil will be aged due to overheating, which will cause the transformer to be damaged in light, and cause a major accident in serious cases. Conversely, if the temperature of the hottest spot of the coil is too low, the capacity of the transformer will not be fully utilized, reducing economic benefits. Therefore, in order to make the transformer in the best operating condition, the measurement of its hot spot temperature is very necessary. In the past, it was difficult to measure directly because the isolation problem of high voltage could not be solved very well. After using the semiconductor fiber optic thermometer, long-distance telemetry can be performed, and the isolation problem has been well solved.  (2) Optical fiber tachometer  The rotational speed of the steam turbine generator set in the thermal power plant is 3000r/min, which is an important parameter that determines whether the frequency of the power grid is stable or not. Conventional electrical and magnetic measurement methods, since the electrical signal and its signal transmission line are easily disturbed by the strong electromagnetic field of the generator,The meter is not working properly. This problem does not exist when using optical fiber to measure the rotational speed. The optical fiber tachometer consists of three parts: the rotational speed-optical pulse conversion, the optical fiber optical path and the signal processing device. A speed-measuring gear plate is fixed on the rotating shaft of the turbo-generator. There are 60 teeth on the edge of the gear plate. Each time the gear plate rotates, 60 light pulses are generated. These light pulses are sent to the signal processing device through the optical fiber. The light pulses are converted into electrical pulses, which are then sent to a digital frequency meter.

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