Does the reboiler still meet the production requirements?
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How to determine whether the reboilers used in production meet the production requirements. During further operation, all the bypasses of the system’s steam control valves are opened to just meet the system’s heating requirements. How can one determine whether this reboiler is sufficient for these needs? If it is sufficient, then other possible causes should be investigated. :There is a handshake process, and ASPEN software can help with the calculations. My WeChat ID is 13561669417; I can provide the necessary parameters.
This question is actually very simple: reboiler, heat exchanger. A heat exchanger must meet certain application conditions. Such as medium pressure, flow rate, temperature, phase state, and the difference in conditions from that of the adjacent heat exchange medium. The setting capacity of a reboiler in a set of equipment must be matched to the associated equipment. It is recommended that, before carrying out the renovation, one should first check whether the necessary usage conditions are met. Otherwise, it constitutes overuse, and in severe cases, production and equipment accidents may occur; this is for reference only.
I want to know what calculations can be used to determine that this reboiler is indeed overloaded
The requirement can only be met by opening the bypass valve of the steam valve; in other words, it is necessary to improve the pressure quality of the steam. Try opening the bypass of the steam trap to see if insufficient heating capacity is caused by poor drainage of condensate
There are many who want to obtain answers through calculation. Calculations require numerous conditions, such as the thermal conductivity of the equipment material, various parameter values determined by the medium and its phase state, the heat exchange area, the structure of the equipment, and so on. These are tasks done by designers; there are some things that remain unknown, such as the thermal conductivity of the materials used. As the user of the equipment, it is sufficient to follow the operating conditions specified by the equipment manufacturer. For reference.
We are not using a steam trap; instead, we use a gas-liquid separation tank to control the liquid level of the condensate, which is already very low
If the liquid level in the gas-liquid separation tank can be controlled and kept at a very low level, then it indicates that the problem is not related to drainage; rather, it’s definitely due to insufficient capacity of the reboiler. However, exactly how much capacity is lacking needs to be determined on a case-by-case basis
I just want to calculate it myself to see if it’s enough, but I don’t know how to do the calculation
1. Consider that fouling on the heat exchanger or polymerization of the fluid can affect heat transfer efficiency; is it possible to isolate it, open it up for inspection and cleaning? 2. The medium temperature is lower than the normal operating temperature.
The calculation is preliminary; practice is the best teacher, and it depends on the conditions at the operating point. According to your description, the heat exchange area has been maximized; yet even with the inlet control valve fully open, the requirements cannot be met, which indicates that either the heat exchange area is insufficient or the heat transfer capacity has decreased. (The former is more likely)