Commissioning date of the new desulfurization and denitrification unit in the catalytic cracking unit
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The catalytic cracking unit was shut down, and a desulfurization and denitrification unit was installed. It is being put into operation for the first time; should it be started simultaneously with the catalytic unit, or after the catalytic unit has started operating normally? Which option is better?
Once the preparations here are complete, the first step is to transport the desulfurized water, and then we proceed to the next stage
The company’s internal environmental protection department requires that operations start first and then be stopped.
Of course, the desulfurization and denitrification units should be put into use once operations resume normally, in order to prevent a large amount of catalyst from entering the desulfurization tower.
If operations start simultaneously, and during the catalyst installation at the time of starting up the catalyst, some of the catalyst is lost and ends up in the desulfurization and denitrification sections, how can this problem be solved?
Both methods will work. 1 For the first start-up, it is carried out together with the catalyst; following the existing practice, it is possible to observe the catalyst loss during the addition process through the chimney. 2 After the catalytic process is operating normally, then start desulfurization and denitration; this approach is relatively simple. It is estimated that the flue gas should be switched over slowly (in fact, it cannot be done any faster). The advantage of this approach is that it avoids the risk of catalyst running in the regenerator. 3. Check what denitration process is used; it can generally be installed later, depending on environmental regulations.
In an era with strict environmental regulations, it is necessary to first activate the desulfurization and denitration systems, as well as the water treatment processes, before introducing flue gas into the desulfurization system; moreover, the catalyst powder must be intercepted by the dust collector prior to desulfurization.
If starting for the first time, it is best to do so after the unit is running smoothly, in order to prevent catalyst loss during startup from entering the equipment