Heat exchange issues in reaction vessels
Thread Content
There are 8 reaction vessels numbered 1 to 8; the coils in these vessels are equipped with jackets for cooling. With the exception of vessels 5 and 6, the reaction time for the other vessels is 40 minutes, while vessels 5 and 6 require a reaction time of just over 1 hour. Could an expert please explain what the cause of this is?
There are many reasons for this: dirt, pipeline resistance; it’s necessary to briefly illustrate the process flow
It’s difficult to analyze; a comprehensive assessment of the situation on site is needed
My personal analysis is as follows: 1. The heat transfer efficiency of the jackets or coils in these two reactors is low (due to scaling or material issues)； 2. The flow rate of the refrigerant entering these two reactors is low ； 3. Is the mixing style the same? 4. Are the material quantities and ratios the same?
It is recommended that the original poster provide a detailed description of the situation, so that experts can analyze it
The basic conditions are as described on the 5th floor, with primary consideration given to heat exchange efficiency and the frequency of heat exchange within the reactor. The heat exchange efficiency is related to many factors at the site, such as whether there is scaling in the heat exchange system, the presence of steam traps, steam pressure, etc., as well as the structure of the reactor and the properties of the materials contained within it.
I think the situation isn’t explained clearly; if it’s in series, then indeed the reaction time gets longer as we move further forward, and equilibrium is gradually reached. In the case of parallel operation, factors such as mixing in the reactor and temperature need to be taken into consideration. As for heat exchange, it can be determined from the temperature measurement points; in fact, the reaction rate is primarily influenced by mixing or feed distribution, reaction temperature, pressure, and other factors.
This is somewhat similar to our actual production process; let’s talk about our situation first! The reactors should all be the same, including the mixing mechanism and the materials used. The reasons for this issue are, firstly, the different amounts of circulating water distributed to each reactor, due to factors such as pipe resistance; secondly, scaling in the jackets. Because these two reasons on our side can both be verified. Reducing the other kettle cooling valves and cleaning the scale also helps improve the situation
Thank you to all the experts for their answers. Now a problem has been identified: one of the layers of the dual-layer parallel coil is blocked