Methanol consumption
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Our company uses the Linde 5-tower low-temperature methanol washing process. Recently, the methanol consumption in this system has increased, while the CO2 emission levels remain stable. There are no signs of internal leaks in any of the drainage systems. The only possible reason for the increased consumption is an increase in the amount of sulfur-recovered acid gas being released. This can be addressed by reducing the ammonia discharge valve, but when this valve is closed, the ammonia level in the system rises slowly and may even exceed the allowed limits. Have other companies encountered similar issues? What measures can be taken to reduce both methanol consumption and ammonia levels in the system?
The acid gas flow rate is 1100 kg/h; the temperature is 33°C. The methanol content in the acid gas is around 4% (V), while the ammonia content has reached 100 mg/L