In low-temperature methanol washing, is ammonia in methanol detected?
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As the title suggests, for low-temperature methanol washing, is there any detection of ammonia in the methanol within the system? We only test for ammonia in gas samples.
We conduct regular monitoring to prevent high ammonia levels from affecting liquid nitrogen washing and sulfur recovery
Generally, no testing is required. Could you tell me more about the situation in your factory? 1. Why is testing necessary? The ammonia level upstream is high ； The ammonia scrubber does not provide good cleaning efficiency ； Ammonia cooler leak? 2. What is the testing cycle? What are the control indicators? 3. What do you do once you detect that the standards have been exceeded? I hope we can discuss this in depth; before you answer, please tell us about our situation. We have been driving for over two years, and there has never been a high level of ammonia in the methanol, nor is there any plan for testing. When the pressure difference in the heat exchanger at the top of the thermal regeneration tower increases, the cryocooler is shut down to restore temperature. I didn’t take it seriously either, but as environmental regulations have become stricter over the years, CEMS have been installed for sulfur recovery, and the previous methods are no longer viable; nitrogen oxides levels can exceed the allowed limits. So I want to see what other factories are like.
The ammonia content in lean methanol at our facility is an item checked during shift inspections
It is mainly used to detect the ammonia content in methanol-poor solutions; the target value is 60 mg/l, in order to prevent poor performance of the ammonia washing tower
The performance of our ammonia washing tower is poor; during the major repair, it was found that the trays were severely damaged, with almost no floating valves left. Before the major repair, the ammonia content at the top of the thermal regeneration was 1-2%, while after the repair it was around 200 ppm.
The cold box was blocked once due to liquid nitrogen carbon washing, and ammonium sulfate was formed once as a result of sulfur recovery. . . . :Q
White crystals, with analytical components of CO2 and NH3