Re-understanding of the electro-hydraulic control system for high-pressure fire-resistant fuel

Abstract: Re-understanding the information of the electro-hydraulic control system of high-pressure fire-resistant oil is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. From June 5th to June 6th, 2002, an expert meeting was held in Beijing, and the 'Guidelines for the Retrofit of Steam Turbine Control System' issued by the State Power Company were carefully discussed. The meeting unanimously agreed on the following four-point steam turbine control system reconstruction suggestions: , 100MW and below. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. From June 5th to June 6th, 2002, an expert meeting was held in Beijing, and the 'Guidelines for the Retrofit of Steam Turbine Control System' issued by the State Power Corporation were carefully discussed. The meeting unanimously agreed on the following four-point steam turbine control system retrofit suggestions: 1 , 100MW and below units (including heating units), it is recommended to use the turbine oil electro-hydraulic coexistence joint control system, or the turbine oil pure electro-hydraulic control system. 2. It is recommended to use the turbine oil pure electro-hydraulic control system for 125MW~200MW units. 3. For units above 200MW, it is recommended to use a pure electro-hydraulic control system for turbine oil. When a pure electro-hydraulic control system for high-pressure fire-resistant oil is used, its necessity should be fully demonstrated. 4. For the electro-hydraulic control system that has been transformed into the coexistence, tracking and switching of turbine oil and electro-hydraulic oil, if the system runs well, in principle, no further modification is required, but it is also possible to further simplify the system and remove the electro-hydraulic control system according to the actual situation of the unit. Switching device, tracking device and other hydraulic components realize the operation of the turbine oil pure electro-hydraulic control system. Experts at the meeting believed that the pure electro-hydraulic control system of high-pressure fire-resistant oil should be re-understood, mainly due to the following three reasons: 1. Liquid working medium. The high ignition point of the fire-resistant oil is conducive to preventing fire, and the use of high-pressure fire-resistant oil is conducive to reducing the structural size of the oil engine. However, the fire-resistant oil is a slightly toxic working substance. At present, there are no specific and effective measures against the treatment of waste fuel oil in China. Although the anti-fuel oil production plant promises to recycle it, it is rarely performed. impact on environmental pollution. Due to the enhanced awareness of environmental protection, in Europe, the pollution of fire-resistant oil has been treated the same as nuclear pollution. The French Alstom 300MW unit has changed the original 12Mpa high-pressure fire-resistant oil pure electro-hydraulic control system to about 7.0Mpa turbine oil pure electric Hydraulic control system, ABB and Siemens no longer use high-pressure fire-resistant oil on the new unit. Mitsubishi, Hitachi and Toshiba all have the trend of developing from high-pressure fire-resistant oil to turbine oil. Therefore, in order to strengthen the awareness of environmental protection, the wide-scale application of fire-resistant oil should be limited. 2. According to the survey, the failure rate of the control system after the transformation, especially the recently transformed units, the pure electro-hydraulic control system of high-pressure anti-fuel oil is relatively more than the pure electro-hydraulic control system of turbine oil. In addition to the frequent occurrence of electro-hydraulic servo valve failures, it is also manifested in the leakage, jamming, refusal or misoperation of various valves, rupture of high-pressure oil pipes; abnormal phenomena such as the failure of the unit to hang the gate, resulting in the drift of the working point of the oil pump, oil Pressure fluctuations and oil pressure drop, resulting in unstable system operation. There are many reasons for the problem, including product quality problems, design and installation problems, but most of them are oil quality problems. For the pure electro-hydraulic control system of turbine oil, the purification device and oil regeneration device with good performance are adopted. In addition, the current electro-hydraulic converter technology has lower requirements for oil quality. From the perspective of some power plant renovation practices, it is very successful. 3. Valve management problems. One of the reasons for adopting the pure electro-hydraulic control system of high-pressure fire-resistant oil is that each regulating valve can be equipped with a servo machine to realize the precise and adjustable valve management function. However, at present, domestic units are basically equipped with a steam distribution mechanism with a hybrid adjustment method, which already has a fixed valve management function. If it is transformed into an adjustable valve management, the economic improvement of the unit is not obvious. Due to the increase operation, it is also rarely used at present. Not all imported units are installed, especially the turbine oil electro-hydraulic control system. For example, Hitachi's 300MW turbine oil pure electro-hydraulic control system uses one electro-hydraulic converter to control four high-pressure regulating valves. , through the cam distribution mechanism to achieve fixed-sliding-fixed operation mode. Therefore, the concept that the valve management function must be provided when transforming into a pure electro-hydraulic control system is not comprehensive, and there is no need to adopt a complex system for the pursuit of valve management functions. At present, the guidelines are being revised according to the opinions of the meeting, and will soon be submitted to the National Electric Power Company for approval and issued in an appropriate form. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Re-understanding of the electro-hydraulic control system for high-pressure fire-resistant fuel'

is emerging as one of the most popular mass flow meter, moving beyond its insertion ultrasonic flow meter benefits, with conclusive scientific evidence suggesting the positive role play in v shape coriolis mass flow meter.

Beijing Sincerity Automatic Equipment Co., Ltd, to be the world leader in products, services and solutions that enable and transform the way consumers and businesses gather, manage, distribute and communicate information.

Beijing Sincerity Automatic Equipment Co., Ltd can reassign work or shuffle around assigned tasks if one team member is overwhelmed while others are not, more effectively managing resources on the fly. With detailed overviews and reports, manufacturers also can more easily stay abreast of new developments.

Beijing Sincerity Automatic Equipment Co., Ltd believes that the shorter the path between consumer and product, the more likely businesses are to convert more sales.