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更新日期: 2019 - 03 - 20
Although there are many references for the design and selection of valves for chemical equipment, there are few references for the selection of valves for limestone wet desulfurization system. Combining with the case of 2x130t/h environmentally friendly thermoelectric boiler flue gas desulfurization system, the methods of valve setting and selection in FGD system of small boilers are summarized.Valve Setting and Type Selection Method of Desulfurization SystemFlue gas desulfurization (FGD) is the main measure to control SO2 emission in coal-fired power plants. Among them, wet flue gas desulfurization with limestone gypsum is the most widely used and mature technology in the world. Although there are many references for the design and selection of valves for chemical equipment, there are few...
浏览次数: 32
更新日期: 2019 - 03 - 20
Why should the control valve be fitted with accessories?In the production process, the control system puts forward various requirements for valves. Therefore, the control valve must be equipped with various accessories to meet the production process.Needs. The correct selection of valve accessories should be a useful guarantee and supplement to the function, safety and reliability of the valve, but if the selection is inappropriate,It will bring many negative effects, so we should attach great importance to the selection.What are the auxiliary devices of pneumatic control valves? What role does each play?Valve positioners - including electrical valve positioners and pneumatic valve positioners, are used to improve the working characteristics of control valves and achieve correct positionin...
浏览次数: 12
更新日期: 2019 - 03 - 20
The flow characteristics of electric control valve are divided into ideal flow characteristics and working flow characteristics. Generally, the flow characteristics provided by manufacturer are ideal flow characteristics, while the actual application needs the flow characteristics of workflow. Because the pressure drop ratio S is less than 1, the workflow characteristics are convex. Therefore, when choosing the flow characteristics of the control valve, the selection should be considered first.The flow characteristic of electric control valve directly affects the control quality and stability of the system, so correct selection is needed.The flow characteristics of electric control valve are divided into ideal flow characteristics and working flow characteristics. Generally, the flow chara...
浏览次数: 14
更新日期: 2019 - 03 - 20
In many control applications, valve positioner is one of the most important accessories of control valve. Especially for a specific application, if you want to choose the most suitable valve positioner, you should pay attention to the following factors:Regulating valve regulator valve positioner (also known as pneumatic valve positioner) is the main accessory of regulating valve. It is usually used with pneumatic valve. It receives the output signal of the regulator, and then controls the pneumatic regulating valve with its output signal. When the regulating valve operates, the displacement of the valve stem is fed back to the valve positioner through the mechanical device, and the status of the valve position is transmitted to the upper system through the signal. Unification.In many contr...
浏览次数: 15
更新日期: 2019 - 03 - 20
In recent years, with the continuous development of science and technology in China, the automation level of enterprise production has been continuously improved. Regulating valve is an important part of ensuring the automation of production process. Regulating valve is the terminal executing device in the automatic control system, which adjusts the production process by receiving the control signal. The control valve has the advantages of simple structure, high stability, low price, fire-proof and explosion-proof. It can be used with pneumatic and electric regulating instruments, and has a high degree of automation.Advantages of Regulating Valve in Use(1) Be agile and able to complete all adjusting orders in time;(2) When used with large cylinder, it has greater momentum driving force.(3)...
浏览次数: 9
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