Start-up and shutdown of catalytic off-take units
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As an auxiliary device to the catalytic unit, how should the flue gas denitration, desulfurization, and dust removal device be handled during operation? Since our plant uses SCR technology, the denitration catalyst has specific temperature requirements; therefore, it is necessary to first start up the main equipment. Only after the flue gas is introduced and the temperature in the denitration reactor reaches the required level can ammonia be injected. Is there any case where the denitration unit was put into operation first, followed by the main catalytic unit? Can the main equipment be shut down first, and then the flue gas denitration equipment, during the shutdown?
It’s better not to turn it on; this technology is a mess – the boiler crystallizes, and it simply doesn’t work
First, start up the water treatment system; once the regenerator begins to add chemicals, introduce the water treatment agents as well. There’s no rush with the SCR system – it can be added before feeding begins. Be careful not to let the SCR catalyst overheat. The shutdown will definitely involve stopping the smoking process and shutting down the system first, in order to ensure that the exhaust gases meet the required standards.
First, circulate the desulfurization wastewater, including that from the dust removal tower; at the same time, increase the temperature at no more than 60 degrees per hour, and ammonia can only be sprayed once the temperature exceeds 320 degrees. We are adjusting the ammonia emissions or NOX levels, but I think our removal efficiency for these pollutants isn’t very good – it’s dropped from 115 to 100 PPM