Control of environmental protection indicators during the start-up and shutdown processes of catalytic cracking
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Dear experts: I would like to ask for advice. During the start-up and shutdown of catalytic cracking units, although the exhaust gases are sent to a desulfurization tower for treatment, how can sulfur dioxide and nitrogen oxides be kept within acceptable levels during operation? How should the operations be adjusted? Please share any relevant experience. I asked for advice. Thank you
Adding alkaline solution and spraying ammonia – what other methods are there for control: L
You are referring to those with a denitration module; what about those without one? I would appreciate it if experts could provide some guidance
First, replace the raw materials in advance with those that have low sulfur and nitrogen content; then, during the shutdown period, keep the oxygen level in the flue gas at a low level. Finally, increase the amount of water used for flushing in the desulfurization tower, which will help ensure that the actual average hourly levels of NOx and SO2 in the flue gas do not exceed the allowed limits