What materials are required for the initial startup of a catalytic cracking unit?
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Dear seniors, I would like to ask what materials are required for the initial commissioning of a catalytic cracking unit? Taking 3 million tons per year as an example, how many tons of various materials would be needed approximately?
Look at your design and feasibility study – is 300 the processing capacity?
Judging from the design, it is generally regular residue, vacuum distillate oil, and coking wax oil
Catalytic start-up materials: 1. Equilibrium catalyst, fresh catalyst, combustion promoter, propylene additive, scale inhibitor, titanium cyanocobalt sulfonate； 2. Fuel gas for furnace heating (natural gas or liquefied gas; propane can also be used if operations start in winter) ； 3. Feed oil (generally determined based on the design and the value of processing residue, to decide whether to use light paraffin oil or residue oil) ； 4. Diesel (catalyzed diesel or straight-run diesel): 5. Naphtha.
Balancing agent: 1000t; Preservative: 300t; Wax raw material: 2000t; Diesel cushion tower: 1000t; Gasoline cushion tower: 1000t; Natural gas fuel: 5000 Nm3/h – consumption for the next three months. Slurry scale inhibitor: 5t; Oxidizer: 4t; Passivator: 7t; Sulfur transfer aid: 15t; Coagulant: 12t; 30% alkaline solution: 200t; Liquid ammonia: 156t; Trisodium phosphate: 1t
These are basically all included in the initial design; they mainly consist of balance agents, new agents, diesel (combustion fuel), gasoline (used for startup spraying), wax oil, and residue. Once operation stabilizes, coker wax oil and hydrocracking tail oil can be introduced, along with pre-heated dry gas. I won’t go into detail about water, electricity, gas, and air. For auxiliary materials, it depends on what your plant uses: passivators, denitration agents, combustion promoters, corrosion inhibitors, liquid ammonia, liquid caustic soda, deoxidizers, etc