pressure control issues
Thread Content
If you want to make a pressure reactor, the temperature is about 200 degrees, and the water phase is continuously fed. When the temperature is about 200 degrees, it is necessary to ensure that the water phase is in a liquid state, so the reactor must ensure a certain pressure. Since continuous feeding and continuous discharging are required, can a safety valve be used to control the reactor outlet, which can not only ensure stable pressure control of the reactor, but also stabilize the opening and enable continuous discharging? Is it feasible to use a safety valve for control in this way? Please give guidance.
It is not advisable to use a safety valve to control discharging. The safety valve works in a gap manner. It would be unsafe to operate continuously for a long time, and it is not allowed to be used in this way. This equipment of yours is quite dangerous, so be sure to pay attention to safety.
Safety valve cannot be used to control discharging: The safety valve opens when facing pressure and resets after pressure relief. It is operated by a spring. When opening, the discharge volume cannot be stable because the flow rate is related to the pressure difference. The safety valve is always in a fully open state when the pressure is not released below the safety pressure. At this time, the flow rate gradually decreases as the pressure decreases. Moreover, the safety valve must be pressure calibrated after opening to ensure a safe value. Such frequent opening cannot guarantee it at all! Absolutely not
The safety valve cannot be used as a discharging control valve. The safety valve should be operated by spring. After continuous operation, the constant pressure value will change, and the controlled pressure is also unstable, which will have a great impact on the operation. It is recommended that you use discharge flow control, and feed pressure control is more reliable.
Safety valves must not be used as discharge control valves according to specifications. Some other fluid self-operated regulating valves such as liquid level control valves should be available.