What are the causes of scaling in ammonia synthesis waste boilers?
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This post was last edited by caocheng on 2019-10-18 08:39. There is severe scaling on the steam side of our ammonia synthesis waste heat exchangers; white crystals cover the tubes, and analysis shows that the main components are oxides of magnesium and calcium. Has anyone encountered a similar issue? Please ask an expert to help analyze what the reason is The water we use is deoxygenated water (thermally deoxygenated).
The hardness of the boiler feed water is too high, and the silica content is likely to be above the specified limits as well – is the water treatment upstream not up to standard? If water treatment is inadequate, the greater the evaporation rate in the waste boiler, the more pronounced the scaling becomes. Implement continuous online monitoring of boiler feedwater, enhance the quality control of water treatment, operate in strict accordance with the specified parameters for boiler feedwater, add descaling agents as appropriate, and increase blowdown.
If you are using deoxygenated demineralized water, then it is most likely that there is a problem with your demineralization process, and the demineralized water is not of satisfactory quality. Of course, you can also check whether the pipelines of your desalinated water and deoxygenated desalinated water systems are properly isolated from any connections to high-hardness water sources such as primary water and circulating water.
Scaling is mainly caused by inadequate desalination of the demineralized water, and this can be determined by analyzing the conductivity of the make-up water. There are also cases where boiler recycled water mixes with substandard water. Synthetic-related factors may also be responsible for insufficient waste discharge; it is necessary to increase the amount of waste discharged, as well as the frequency and duration of such discharge. Additionally, the steam condensate should be analyzed to determine whether there are any leaks inside the boiler. If ammonia leaks into the water, scaling is more likely to occur