Catalytic pressure-reducing orifice plate
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What is the approximate pressure after the pressure-reducing orifice plate? Is it positive pressure or negative pressure?
It is generally positive pressure. Because the medium in front of the pressure-reducing orifice plate is flue gas that has just come out of the three-spinner, and it is under positive pressure at that time; passing through the pressure-reducing orifice plate serves to lower the pressure, after which the gas either passes through the waste heat boiler or is discharged directly through the chimney via a bypass. It depends on the actual conditions. If the draft in the chimney is very strong and the flue gas does not pass through the waste heat boiler, negative pressure can still be generated in that area; however, this negative pressure is mainly caused by the suction force of the chimney, and the flue gas ultimately exits through the chimney.
The pressure reduction orifice plate of the unit equipped with a flue gas extractor has an outlet pressure of around 3 to 7 Kpa
In actual operation, the pressures before and after the pressure-reducing orifice plate in the downstream section of flue gas after catalytic regeneration vary depending on different operating conditions, and it is not possible to generalize. For example: 1. The presence or absence of a waste heat boiler; 2. The presence or absence of a desulfurization and denitrification system; 3. In the case of both a boiler and a dual-desulfurization/denitrification system, whether the bypass to the direct exhaust chimney is active and to what extent; 4. Whether the double-acting slide valve is opened to a large extent. All of these factors affect the pressure at the pressure-reducing orifice plate