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Steam electric pneumatic valve selection improper harm big adjustment
by：AIRWOLF
2020-10-15
Steam electric regulating pneumatic valve consists of electric temperature control pneumatic valve, electric pressure regulating pneumatic valve, pneumatic valve and the electric flow control because of its use of high temperature and high pressure, so when the selection is exquisite, if improper selection, will be in use process fault occurs frequently, seriously affect the normal operation of the equipment and systems.
Below we talk about steam electric regulation by an instance of pneumatic valve selection and use of some problems need to be aware of.
there was a large chemical enterprises, the need to control the temperature of the reaction tank, the steam of steam from thermal power plant steam heat, the temperature about 200 ℃, pressure 1. Around 2 mpa, asked to use steam electric regulating pneumatic valve to control the steam pressure constant, pneumatic valve inlet pressure of 0. 8 to 1. 0 mpa, the outlet pressure of 0. 4 to 0. 5MPa。 Began to selection, because there is no clear field parameters, selection of electric single-seat regulating pneumatic valve, using fault frequently soon, actuator motor burn out, break control module damage, reduction gear, often happen.
send someone to the scene after the observation, analysis, to find out the cause of the problem. Originally, steam electric regulating import and export pressure difference is bigger, pneumatic valve actuator at work load is too large, or overload, so there will be a reduction gear, several times destroyed, module and motor damage, what's more, when users in the system design take improper selection pressure point ( Changes in pressure particularly fast) Pressure control module, the control system of PID parameters setting also has a problem, and the system sensitivity is high, the pressure a bit of a change, regulator can adjust output control signal to drive, pneumatic valve, regulating pneumatic valve caused by frequent action, so that the shock, which caused the shock of the whole system, not only cannot be stable, the controlled variables to adjust the pneumatic valve, unable to complete the task of adjustment.
after consultation with users, decisive decided to use electric socket regulating pneumatic valve as a substitute for single-seat pneumatic valve, because the socket of the pneumatic valve balance structure of the pneumatic valve core, can be greatly offset steam generated by the unbalanced force, reduce the load of electric actuator, is conducive to regulating pneumatic valve run stably for a long time. Did not choose balanced single-seat regulating pneumatic valve, is considering the single-seat pneumatic valve guide sealing ring is not resistant to steam conditions of long-term wear and tear, and the system of regulating pneumatic valve leakage standard is not high, the sleeve pneumatic valve fully qualified for this kind of condition. At the same time, to determine the pressure points, when the sleeve regulating pneumatic valve change after debugging system, reset the PID parameters, reduce the proportional band, the increasing integration time, the system response time to adjust a little bit, steam pressure fluctuations on the premise of can satisfy the use. After such an adjustment, basically solved the problem.
in fact, if from the ideal solution to consider, according to the site conditions and requirements, selection of pneumatic two-seater regulating pneumatic valve is more appropriate, just the user laid air pipe is not convenient, didn't adopted.
the place on put together is narrated, pneumatic valve for steam electric adjustment, selection is important, installation, debugging and maintenance is more important, there are a lot of failure are users not familiar with the performance of the regulating pneumatic valve and characteristics in operation and maintenance. You can't adjust the pneumatic valve is isolated from the control system, and need to take it and consider together, the whole system to adjust, and adjust the pneumatic valve actuators is a dynamic, prone to various faults, this is the manual pneumatic valve can't than. And, with the increasingly popularization of field bus control pneumatic valve, originally by the system task, down to the adjustment of the pneumatic valve body, the use and maintenance of steam regulating pneumatic valve is put forward higher requirements.
drainage engineering company for many fields such as chemical industry, metallurgy, formulate reasonable solution, pneumatic valve for high temperature and high pressure conditions, selection of suitable steam electric adjustment of pneumatic valve and pneumatic valve control system.
there was a large chemical enterprises, the need to control the temperature of the reaction tank, the steam of steam from thermal power plant steam heat, the temperature about 200 ℃, pressure 1. Around 2 mpa, asked to use steam electric regulating pneumatic valve to control the steam pressure constant, pneumatic valve inlet pressure of 0. 8 to 1. 0 mpa, the outlet pressure of 0. 4 to 0. 5MPa。 Began to selection, because there is no clear field parameters, selection of electric single-seat regulating pneumatic valve, using fault frequently soon, actuator motor burn out, break control module damage, reduction gear, often happen.
send someone to the scene after the observation, analysis, to find out the cause of the problem. Originally, steam electric regulating import and export pressure difference is bigger, pneumatic valve actuator at work load is too large, or overload, so there will be a reduction gear, several times destroyed, module and motor damage, what's more, when users in the system design take improper selection pressure point ( Changes in pressure particularly fast) Pressure control module, the control system of PID parameters setting also has a problem, and the system sensitivity is high, the pressure a bit of a change, regulator can adjust output control signal to drive, pneumatic valve, regulating pneumatic valve caused by frequent action, so that the shock, which caused the shock of the whole system, not only cannot be stable, the controlled variables to adjust the pneumatic valve, unable to complete the task of adjustment.
after consultation with users, decisive decided to use electric socket regulating pneumatic valve as a substitute for single-seat pneumatic valve, because the socket of the pneumatic valve balance structure of the pneumatic valve core, can be greatly offset steam generated by the unbalanced force, reduce the load of electric actuator, is conducive to regulating pneumatic valve run stably for a long time. Did not choose balanced single-seat regulating pneumatic valve, is considering the single-seat pneumatic valve guide sealing ring is not resistant to steam conditions of long-term wear and tear, and the system of regulating pneumatic valve leakage standard is not high, the sleeve pneumatic valve fully qualified for this kind of condition. At the same time, to determine the pressure points, when the sleeve regulating pneumatic valve change after debugging system, reset the PID parameters, reduce the proportional band, the increasing integration time, the system response time to adjust a little bit, steam pressure fluctuations on the premise of can satisfy the use. After such an adjustment, basically solved the problem.
in fact, if from the ideal solution to consider, according to the site conditions and requirements, selection of pneumatic two-seater regulating pneumatic valve is more appropriate, just the user laid air pipe is not convenient, didn't adopted.
the place on put together is narrated, pneumatic valve for steam electric adjustment, selection is important, installation, debugging and maintenance is more important, there are a lot of failure are users not familiar with the performance of the regulating pneumatic valve and characteristics in operation and maintenance. You can't adjust the pneumatic valve is isolated from the control system, and need to take it and consider together, the whole system to adjust, and adjust the pneumatic valve actuators is a dynamic, prone to various faults, this is the manual pneumatic valve can't than. And, with the increasingly popularization of field bus control pneumatic valve, originally by the system task, down to the adjustment of the pneumatic valve body, the use and maintenance of steam regulating pneumatic valve is put forward higher requirements.
drainage engineering company for many fields such as chemical industry, metallurgy, formulate reasonable solution, pneumatic valve for high temperature and high pressure conditions, selection of suitable steam electric adjustment of pneumatic valve and pneumatic valve control system.
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