Leakage inside the external heat exchanger
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This post was last edited by Shuichangshou on 2010-1-8 09:34. What symptoms occur when an external heat exchanger leaks, with all other parameters remaining unchanged?
1. The external heat extraction and the lean-phase and dense-phase temperatures of the regenerator drop sharply. II. The regeneration pressure rises rapidly. III. The pressure drop of the centrifuge increases significantly. IV. The density of the regenerated dense-phase catalyst increases. V. The external heat supply water flow rate is abnormally higher than the steam flow rate. VI. It cannot be maintained when the water level in the air tank drops significantly. VII. Steam flow rate decreases. VIII. Decrease in steam pressure.
1. The regeneration pressure increases suddenly. 2. The reserve in the regenerator changes significantly. III. Regenerator temperature drops sharply! IV. The swirl pressure drop increases. V. The drum liquid level is dropping rapidly!
If there is a leak in the external heat exchanger, then the catalyst will definitely be lost, there will be significant loss through the chimney, and the vibration of the smoke extractor may also increase.
This post was last edited by Refiner on 2010-1-9 02:22. There are 18 heat-exchange tubes for external heating; 8 of them have been removed so far, and the symptoms observed are not entirely the same. Main issues: 1. Increase in dilute phase density; 2. Increase in regeneration pressure; 3. Increased difference between water supply and steam generation; 4. Decrease in bed temperature
Brother on the 6th floor, I’m quite interested in the reason for your leakage. Could you share it? Thank you! Given your current level of operation, is there still a chance of leakage? How do you prevent that? Could we talk about it?
If external heat leakage occurs without any burst due to water shortage, it is generally caused by manufacturing defects; this is especially true for fin-type designs. If the heat treatment is not proper, welding stresses can lead to local cracking and thus leakage. Furthermore, the position of the wear-resistant lining must be appropriate; otherwise, catalyst erosion occurs quite rapidly.
In the case of internal leakage, the water inflow is much greater than the steam generation. 2. The temperature at the point of internal leakage in the external heat exchanger drops significantly. 3. The density and storage capacity of the external heat exchanger decrease. 4. Severe loss of catalyst occurs. I disagree with the idea that the regeneration pressure rises significantly; in cases of normal internal leakage, the pressure change is not noticeable
Agree with the view above; the key factors are water flow rate, steam generation rate changes, and the drum liquid level.
Whether it is a small leak or a large one, the changes in the total amount of water entering and air exiting can be used to tell. If the leakage is severe, pressure and temperature will also fluctuate; by monitoring the temperature changes at different points using thermocouples, it is possible to roughly determine the location of the leak