How to choose a safety valve for fine chemical reaction kettles?
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In fine chemical reaction vessels, reactions take place, and these reactions can lead to overpressure; therefore, safety valves must be installed to protect the vessels. Since the process package does not provide various parameters related to the conditions during reactions, such as the volume expansion coefficient, maximum heat transfer rate, and specific heat at constant pressure when there is no mixture present, how can the appropriate safety valve be selected?
If the process package doesn’t even provide this, then what’s the use of it?
Many fine chemical companies are unable to provide this parameter
That’s indeed the case; if the cost of decorating the package isn’t high, just endure it. In terms of the manufacturing process, it is determined based on the ratios of various process materials and the minimum pressure that can be tolerated. If the process is complex, safety valves are used in accordance with the design parameters of the equipment
If there aren’t many parameters, you can take a look at this logic. 1. Overpressure can occur as a result of reactions taking place in the reactor; theoretically, the safety valve will open to release the medium after the reaction occurs (there will still be medium present before the reaction, but this is sufficient to address the issue of overpressure). 2. The discharge temperature can be set at the maximum allowable temperature, which is also the design temperature of the reactor – this design temperature already takes into account scenarios of excessive pressure during reactions. 3. The discharge volume should be determined based on the reaction; this value is necessary. 3. The setting pressure can be set at or below the design pressure. 4. Since reactions in reactors can cause overpressure, it’s not a fire scenario; therefore, the overpressure threshold for the safety valve can be set at 10% (in the case of a single valve). Thus, the key parameters for the safety valve—such as the medium, discharge temperature, discharge volume, setting pressure, and overpressure threshold—have been determined, allowing the safety valve to be specified.
I still agree more with the view from floor 5
I have handled a case of a reactor explosion: a 5,000L reactor was used to mix various materials at low temperatures, and then the mixture was transferred to another reactor. The temperature distortion in the reaction vessel caused the next reaction to occur earlier than expected. Within 13 seconds, from pressure overload to explosion. The rupture of the on-site burst disc (DN125) also did not prevent the explosion of the reactor; it caused damage to nearby equipment, pipelines, instrumentation, and buildings. Fortunately, no one was injured at the scene.
In this way, two sets of thermometers can be installed on the configuration tank, allowing for more reliable comparative monitoring of temperatures
It is indicated in the diagram; since it is a configuration kettle, the client, based on years of experience, removed one of them. Another one is located in the dead zone, but it is convenient for observation. The dead zone is blocked
It’s better that the process package is provided; what I want to know is what should be done if it isn’t provided!