Overtemperature on the outer surface of the boiler furnace
Thread Content
This post was last edited by chuan21206 on 2023-10-19 at 21:48. The steel shell of the boiler furnace newly installed in our project is made of Q235 material; recent external temperature measurements showed that the highest temperature reached 538 degrees Celsius. I consulted the manufacturer, who stated that the maximum operating temperature can reach 540 degrees Celsius. I would like to ask my seniors: what kind of damage might occur to Q235 material at a temperature of 538 degrees Celsius? Can Q235 withstand such high temperatures? Thank you!
There may be several reasons for overheating on the outer surface of the boiler furnace: 1. Damaged or insufficient insulation material inside the furnace: Please check the thickness and integrity of the insulation material; if it is damaged or missing, it needs to be replaced and supplemented promptly. 2. Excessive operating load of the boiler: When the boiler is operated under an excessive load, the heat generated by fuel combustion inside the furnace exceeds the designed tolerance level, which can lead to excessively high surface temperatures. It is necessary to reduce the operating load of the boiler at this time. 3. Incomplete fuel combustion: Incomplete fuel combustion results in some of the heat not being transferred to the working fluid, which leads to an increase in the furnace temperature. Inspect the combustion system to ensure proper fuel combustion. 4. Poor heat dissipation inside the boiler: Faults in the cooling system or clogs in the radiators can prevent heat from being effectively dispersed within the furnace, resulting in overheating of its exterior surface. Check the cooling system to ensure it is working properly. 5. Unreasonable boiler structure design: Issues in the boiler’s structural design can lead to an ineffective transfer of heat, resulting in a higher temperature on the outer surface of the furnace. The boiler manufacturer or a professional engineer can be asked to re-evaluate the boiler design. For the above reasons, it is recommended that you have a professional conduct an inspection and repair to resolve the issue of excessive temperature on the outside of the boiler furnace. At the same time, pay attention to monitoring the operating parameters of the boiler and ensure that it operates within safe limits. .
Furnace type, temperature measurement location, and temperature measurement interval.
“Can Q235 withstand such high temperatures? ”This statement should be based on the data provided by the equipment manufacturer. It is the temperature determined through design based on factors such as equipment structural stress and metal deformation. Usually, a layer of refractory material is used as lining inside the furnace shell. Whether the high temperature of the furnace shell is related to the thickness of this lining material is provided for reference.
According to API 571 standards, when operating at temperatures above 538 degrees Celsius for five years, the material may undergo graphitization.