On temperature changes following a drop in the pressure of the boost air in catalytic cracking
Thread Content
Dear sea friends: The designed air volume for the pressurization air is 550 NM3/min, with an outlet air pressure of 0.499 MPAG and a temperature of 280~300°C. The inlet air is primary air (temperature: 220–250°C, pressure: 0.364 MPa). If the pressure of this air is reduced to 22 KPa, will its temperature drop? By how much will it decrease?
The temperature changes with pressure; so what’s the point of reducing the pressure?
1. According to the law of conservation of energy, there should be a temperature drop; as for by how much, it is necessary to consult tables or use certain software! 2. Import: 0.36, Export: 0.22. Is this a pressure booster? Let’s do experiments!
If the pressure of the pressurized air decreases, it is crucial to determine whether air can still be supplied and what impact this will have on fluidization.
Reduce this wind pressure to use it as a dilution air for medium-temperature SCR denitration in emergency situations.
You might have some misunderstandings. Here’s the situation: I’ve already specified the pressures at the inlet and outlet of the booster pump. What I want to know is, if the pressure of the air at the outlet of the booster pump drops from 0.499 MPa to 0.022 MPa, by how much will its temperature decrease? (0.022 MPa instead of 0.22 MPa)
I’m sorry; I wasn’t clear enough. It’s intended to be used as dilution air for medium-temperature SCR denitration in emergency situations. rather than the air for fluidization.
Will the environmental protection group agree to you doing this?
You have misunderstood; I’m not naively trying to use pressurized air to dilute the nitrogen oxides or sulfur oxides in the flue gas at 560,000 NM3/h. However, the medium-temperature SCR denitration process requires ammonia injection, and since the amount of ammonia used is small, it needs to be diluted in advance using dilution air; I would like to use pressurized air as a substitute for this dilution air. Now I know it can’t be replaced. The temperature at which the pressure drops to 0.022 MPa has been calculated.
Why is there so little pressurized air from you? . .
Thank you, it also cleared up some of my doubts!