【Ammonia Stripping】Issues with Adding Hydrogen Peroxide
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1. Are there any manufacturers that add hydrogen peroxide during ammonia stripping? Personally, I don’t think it’s necessary. 2. Are there any manufacturers that add hydrogen peroxide at the stripping tower? If so, where was it added?
Why do you still add hydrogen peroxide? Is the stripping tower severely corroded? It shouldn’t cause severe corrosion, right? At least it should be better than carbon dioxide stripping.
Based on the operational data from various plants over the past decade, the corrosion caused by ammonia stripping can be said to be more severe than that caused by CO2, and there are several reasons for this. Furthermore, the reason for exploring this issue is that an existing air compressor is used to supply air to the bottom of the stripping tower; this compressor has a high failure rate, high purchase costs, and high maintenance expenses. If it can be changed to hydrogen peroxide, the situation will be better!
It is understood that the main locations where hydrogen peroxide is added to the CO2-stripped urea plant are as follows: the first location is on the inlet pipe that carries the liquid coming out of the urea tower into the stripping tower; the second location is on the inlet pipe for the ammonium methane solution that goes from the ammonium methane pump to the high-pressure washer; the third location is at the outlet of the high-pressure ammonium methane injector. The first three specific installation locations may vary among different manufacturers. If there are different methods of addition, the specific location for addition in our factory and the effects of its use can be provided. The high-pressure section for ammonia stripping is not very different from that used in CO2 stripping; it is advisable to follow that approach as well.
The ammonia stripping tower is made of titanium, which offers excellent corrosion resistance; there is no need to add air or hydrogen peroxide. Titanium materials have poorer erosion resistance; turn around at the appropriate time depending on the degree of wall thickness reduction.
No one answered the original poster’s question: are there any manufacturers that add hydrogen peroxide during ammonia stripping? I’m also very curious; if possible, could fellow sea users provide the factory name? But I guess there isn’t; less ammonia vapor is added to the air, so it’s not easy to explode. Adding a hydrogen peroxide pump to the high-pressure system presents issues regarding both investment and safety.
If hydrogen peroxide is used to replace preservative air, it is not sufficient to use just one hydrogen peroxide pump to feed the high-pressure system; generally, at least two pumps are required. It is understood that, under normal circumstances, if hydrogen peroxide is used, one hydrogen peroxide pump is required for each point of injection; therefore, the number of hydrogen peroxide pumps needed equals the number of injection points. This post was last edited by Durian on 2009-4-28 11:32.]
Multiple pumps are not necessary; one hydrogen peroxide pump can have multiple nozzles.
Let’s discuss the following questions with cthlj2007 from Haiyou: 1. Are your hydrogen peroxide pumps of the centrifugal type or reciprocating type? 2. Since a multi-nozzle system is used, how should the amount of hydrogen peroxide at each injection point be controlled?
1. Centrifugal diaphragm type. 2. Each head functions as an individual diaphragm pump, except that they share one motor.
In my opinion, as long as the sulfur content in the CO2 gas is properly controlled and the oxygen content is kept at its upper limit (which is especially important during startup and shutdown), there is no need to invest in adding hydrogen peroxide.
We use ammonia stripping; no hydrogen peroxide is added, and the oxygen level is kept higher at low load levels.
Hydrogen peroxide has an excellent oxidizing capacity; its corrosion rate on system equipment is likely to be n times that of air, so we dare not use it.