What to do if the deaeration effect of the deaerator is poor?
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Due to design issues, the deaerator in our facility has failed to achieve the required deoxidation levels despite several modifications. It is necessary to increase the amount of hydrazine used for chemical deoxygenation; the quantity of hydrazine used is very high, several dozen times or even a hundred times higher than the designed level. As we all know, hydrazine is carcinogenic, and continuing to use it in such large quantities is certainly not good. What I want to ask is: what impact does such a high amount of hydrazine have on the boiler equipment and the quality of the steam? Thank you
We still need to consider using thermal deoxidation to solve the problem. This can be addressed by the atomization of water and the distribution of steam. Our company has encountered such a problem before. The solutions are the two items mentioned above. The addition of a large amount of hydrazine leads to an increase in conductivity.
The deoxygenation effect is not good, and a detailed analysis is required. This is because there are many reasons for the low rate of satisfactory dissolved oxygen levels in the feedwater or for the persistent unsatisfactory quality of the water coming out of the deoxygenator. These reasons include: 1. The deoxygenator cannot operate at its rated parameters, which relates to aspects such as the heating steam source and the temperature of the incoming water； 2. High water replenishment rate and uneven water distribution ； 3. The deaerator is not maintained in a timely manner, and defects are not resolved promptly ； 4. The impact of the level of the water tray and changes in the area of the water spray holes. For the above reasons, we identified the main causes based on practical considerations and took corresponding measures, such as enhancing operational adjustments, upgrading spraying equipment, improving monitoring instruments, strengthening chemical monitoring, and deploying automatic control systems. With some effort, I think the deoxygenation effect will improve.
I wonder what system you use and whether there is a catalyst. Many catalysts are most sensitive to ammonia. An increase in conductivity also deteriorates steam quality. If the deoxygenation effect is poor, first check the operating parameters. If it’s operating normally, it might be due to poor contact with the vapor; it’s probably time for maintenance.
Just adjust the operations according to the working principle of the deaerator. Henry's law and Dalton's law. 1. Reach the saturation temperature at the corresponding pressure. 2. Slightly increase the temperature of the water entering the deaerator. 3. Adjust the amount of steam released.