What causes ammonia solution to become ineffective?

It’s an amine solution, not “ammonia solution”; it seems there might be a leak inside the heat exchanger What is the hydrogen sulfide content in the lean amine solution?

The hydrogen sulfide content is between 3.5 and 4.2

This post was last edited by ylb913 on 2015-7-5 at 20:28. One needs to learn to analyze things and figure out the reasons on their own; too little information is provided. Questions are answered one by one, and it’s embarrassing to ask more questions. It’s too difficult to expect communication to take place in this way on the Haichuan platform. There is a saying that one should first check whether there are issues with the process parameters before suspecting the equipment. Since process-related issues are relatively easy to handle, dealing with equipment and shutdowns can be quite challenging. Is there internal leakage in the rich and lean amine fluid heat exchanger? There are a few questions: 1. What is the material of your heat exchanger? 2. How long has it been running? What are the other relevant parameters of its operation, the load, and what was the situation before? To determine whether there is an internal leak in the lean amine fluid heat exchanger, it is possible to do so by taking samples from the bottom of the regeneration tower or before the lean amine fluid enters the heat exchanger and analyzing their H2S content.

Does \"amine solution\" refer to monoethanolamine?

Our regeneration process has been quite stable, but starting today the amine solution has begun to lose its effectiveness. Why is that? The temperature during regeneration hasn’t exceeded 125 degrees. Your question is too simple; it’s the amine solution itself that’s at issue, not just “ammonia solution”. The loss of effectiveness could be due to a decrease in concentration or foaming and leakage – there are many possible reasons. There are many units that use shifted amine solutions; processes such as coking, catalysis, hydrogen addition, reforming, and exhaust gas absorption all make use of them. The first issue is that the systems get dirty ； The second issue is that the concentration is too high, causing foaming ； Third is leakage from the cold exchange equipment ； Fourth is the excessively high tower top temperature and excessive volume of acidic water ； Fifth, verify whether the low-temperature instruments are functioning correctly; also check whether your low-pressure steam at 0.3 MPa meets the standards. If the steam temperature is high, the initial contact will also affect the quality of the amine solution. The last point is to check for any other issues that may have arisen in the manufacturing process.