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This post was last edited by Beiqinghua Nangongda on 2021-5-28 08:03. None

Now, what we do is add insulation on the outside, and also design the distance of the waste heat boiler to reduce the length of the flue gas pipelines.

This post was last edited by Beiqinghua Nangongda on 2021-5-28 08:04

I’m not from the workshop; I need to ask you. I noticed that there is no insulation at the section coming out of the flue gas turbine, while there is insulation on the outside of the section leading to the flue gas desulfurization unit. As for whether there is a lining inside, I need to ask and then get back to you.

This post was last edited by Beiqinghua Nangongda on 2021-5-28 08:04

1. When determining the metal temperature, appropriate thermal conductivity values for insulation linings are selected based on specific conditions such as the temperature of the surrounding medium, ambient temperature, and wind speed, and the thickness of the lining is determined accordingly. 2. Once the lining is chosen, the metal surface is greatly affected by environmental changes, such as those between winter and summer, wind speed, and whether the surface is exposed to wind or not. 3. When designing the lining, it is not possible to take all operating conditions into account; if the temperature is to be kept above the dew point under any given condition, the thickness of the lining cannot be too great, as this would lead to increased heat loss. 4. Installing insulation on the outside is a way to raise the temperature of the metal, while at the same time reducing heat loss. However, when designing the insulation, attention must be paid to the appropriate thickness; if the medium reaches a temperature above the allowable stress range of the metal, excessive insulation on the outside of the steel plate will cause the metal temperature to rise rapidly, thereby reducing its strength.

When insulation is added around the pipes with linings, the temperature of these pipes can be well controlled; however, if the temperature rises very high (for example, to 300°C), the pipes will expand and deform, causing the welds to crack. The design institute required the installation of temperature-sensing resistors under the insulation layer, but this was ineffective; since the temperature was high, it was not possible to adjust the thickness of the protective layer. Use iron sheet to make a wind shield that seals well, which can significantly increase the wall temperature.