Seek the process parameters for atmospheric and vacuum tubular heating furnaces (furnace tube material: 1Cr5Mo)

The furnace temperature should not exceed 800 degrees.

The temperature of the exhaust gases directly discharged must be at least 170 degrees to prevent dew point corrosion

I’m referring to the temperature of the retaining wall, that is, the temperature of the flue gas flowing from the radiation chamber into the convection chamber. Our plant stipulates that the temperature of the retaining wall in the pressure-reduction furnace should not exceed 700 degrees, but under our current load conditions, the temperature exceeds 700 degrees.

The temperature in the radiation chamber shall not exceed 800, and that in the convection chamber shall not exceed 750

I want to know which specification states this; we need to modify the metrics

You can check the Q&A on atmospheric and vacuum distillation technology regarding furnace wall temperature

This post was last edited by tjhxtgg on 2011-7-12 at 16:25. The average carbon content of 1Cr5Mo alloy steel pipes is 0.15%, the chromium content is 4.00–6.00%, and the molybdenum content is 0.45–0.60%. Heat treatment – annealing. Mechanical properties (minimum values): Tensile strength (σ^b) – 390 MPa; Yield strength (σ^s) – 185 MPa; Elongation (δ^5) – 22%. High-temperature strength (σ^D, 10^5 hours) – 27 MPa at 600°C. Examples of applications – high-temperature furnace tubes and components operating at temperatures up to 600°C. The average carbon content of 1Cr5Mo is 0.15%, the chromium content is 4.00–6.00%, and the molybdenum content is 0.45–0.60%. Heat treatment – annealing. Mechanical properties (minimum values): Tensile strength (σ^b) – 390 MPa; Yield strength (σ^s) – 185 MPa; Elongation (δ^5) – 22%. High-temperature strength (σ^D, 10^5 hours) – 27 MPa at 600°C. Examples of applications – high-temperature furnace tubes and components operating at temperatures up to 600°C.

The specific temperature needs to be calculated; it is certainly not appropriate to keep the furnace wall temperature below 700 degrees. It is necessary to check whether the area of the shielding tube exceeds the temperature limit; 800 should be sufficient.

Reply to 1# jianglijun: The furnace temperature is primarily determined by the refractory lining; generally, lightweight castables are sufficient for temperatures below 800 degrees； The convection chamber temperature is determined by the material of the convection furnace tubes ； The flue gas temperature is determined by the sulfur content of the fuel; it is generally sufficient for this temperature to be 10 degrees higher than the dew point ； The radiation outlet temperature can be below 380 degrees ；

The furnace temperature is primarily determined by the refractory lining; generally, lightweight castables are sufficient for temperatures below 800 degrees； The convection chamber temperature is determined by the material of the convection furnace tubes ； The flue gas temperature is determined by the sulfur content of the fuel; it is generally sufficient for this temperature to be 10 degrees higher than the dew point ； The radiation outlet temperature can be below 380 degrees