In pneumatic conveying system, the dome valve is the main equipment. Usually, because of the physical separation of pneumatic part and electronic part of the control box and insufficient collection of valve status signals, the open-loop control of the dome valve reduces its service life and makes it difficult to deal with faults. After using the dome valve AI intelligent controller, the integration of pneumatic and electronic control and AI of the dome valve can be realized. Intelligent control and real-time monitoring of valve status are convenient for field debugging and later maintenance, which greatly prolongs the service life of dome valve and fully ensures the reliable and stable operation of pneumatic conveying system. The pneumatic conveying system of Guohua Sanhe Co., Ltd. Phase I 2 *350 MW unit and Phase II 2 *310 MW unit, Xinjiang Huadian Hongyanchi Power Plant Phase II 2 *200 MW unit and Huadian Wangting Power Plant Phase 1 *600 MW unit used German Muller and British Clyde dome valves. The original in-situ control box was exploited for bare pneumatic system and signal of valve status. Insufficient collection results in corrosion of pneumatic system, frequent extrusion or wear of seal ring, erosion of valve body, and frequent failure, which seriously affects the normal operation of pneumatic conveying system. Remove the original local control box and replace it with the dome valve controller, introduce the feedback signals of full opening and full closing of the valve into the control loop, integrate the pneumatic and electronic control part, and install the operation display unit, so as to realize the AI intelligent control of the dome valve and the quick positioning of the valve fault, etc.
Physically, the pneumatic part is outside the pneumatic part.
Bad working conditions are isolated to extend the service life of the dome valve as much as possible. Therefore, according to the actual problems on the spot, Northwest Electric Power Design Institute Co., Ltd.
and Shaanxi Chengguan Electric Power Environmental Protection Development Co., Ltd. cooperated to develop a dome valve controller (patented), which solved the problems of open-loop control of the dome valve in-situ control box and decentralized layout of gas and electricity control. After field installation and debugging, the damage rate of sealing ring is obviously reduced, the fault location is accurate, the service life of the dome valve is effectively prolonged, and the reliable and stable operation of the pneumatic conveying system is fully guaranteed. The solid latching of switch signal can be realized by using the integrated camshaft and spring clamping mechanism.
The “on-off feedback” signal and “sealing ring pressure” signal of the valve are introduced into the control loop, and the AI intelligent control of the dome valve is realized by the integrated circuit in the control unit. The fault type of the valve can be accurately located by calculating, analyzing and counting the feedback status and valve instructions of the control unit. By operating the display unit and receiving the signal from the control unit, the actual state of the valve can be monitored in real time. By using new technologies such as miniaturization of solenoid valve, microprocessor chip, memory, integrated circuit and LED miniature indicator lamp, combined with intelligent control principle of automatic control AI, the functions of AI intelligent control, fault location and status display of dome valve are realized. The principle is that when the valve is opened or closed, the feedback signals of “on-off” and “pressure of sealing ring” on the camshaft are collected first, and then the control unit analyses, calculates logically, counts and delays these signals, outputs control instructions, opens and closes the valve, fills and discharges the sealing ring, etc.
at the same time, on the circuit board. The integrated fault display LED indicator lamp can prompt the fault type quickly, and real-time monitor the actual state of the valve through the side operation display unit. Aluminum alloy shell, pneumatic control block, control unit, camshaft, operation display unit, etc. Feeding dome valve or discharging dome valve. High integration: The pneumatic part and electronic control part are integrated in a closed controller, and they are separated from the bad working conditions outside, which can fully guarantee the stable and reliable operation of precision components. Signal locking is firm and reliable: the integrated camshaft with spring clamping mechanism is developed, which not only facilitates the adjustment of on-off feedback in an operation plane, but also securely latches these signals.
AI intelligent control: The “on-off feedback” signal and “seal ring pressure” signal of the valve are introduced into the control loop, and the AI intelligent control of the dome valve is realized by CPU, memory and integrated circuit in the control unit. Fault location is accurate and fast: the fault type of the valve can be accurately located by logical calculation, analysis and statistics of the feedback status and valve instructions of the control unit. Real-time monitoring: The actual state of the valve is transmitted to the operation display unit by receiving the signal from the control unit in real time. It has strong logic operation ability and can locate fault types quickly.
The controller effectively protects the valve body and sealing ring of the dome valve, guarantees the safe and stable operation of the pneumatic conveying system, and effectively reduces the work intensity of the maintenance personnel and shortens the maintenance time. Its effectiveness and stability have been verified in practice. Therefore, thermostatic element we think that in the pneumatic conveying system, the dome valve can be generally replaced or added to the controller, which is a good solution to protect the valve body and seal ring, shorten maintenance time and reduce operating costs. At present, the controller has been successfully applied in the pneumatic conveying system of Guohua Sanhe Co., Ltd. Phase I 2 *350 MW unit and Phase II 2 *310 MW unit, Guohua Hulunbeier Co.
, Ltd. 2 *600 MW unit, Huadian Hongyanchi Co., Ltd. 4 *200 MW unit and Huadian Wangting 1 *600 MW unit, because of the high failure rate of the local control box and the grinding of the dome valve. Severe damage, serious corrosion of pneumatic components and other issues, so it is urgent to install a controller. Controller is designed on the basis of actual production applications and users’own interests. Its advanced design concept and excellent design structure can fully protect the interests of users. Each sub-unit in the controller has powerful function, high integration and perfect interface, which can be easily embedded into the existing control system. The convenience of field installation, simple daily maintenance and the versatility and high interchangeability of spare parts in the later period all make the operation cost and maintenance cost of the controller to be lowest in production. There are MCU control unit, pneumatic unit and operation display unit in the controller, which are used to realize the action of the valve body and the filling and deflating of the sealing ring. In addition, there are peripheral interfaces in the control unit, which can be easily embedded in the existing PLC or DCS control system. The controller is equipped with control unit, pneumatic unit and operation display unit.