What faults are prone to occur in electric thermal oil furnaces

Mainly manifested in the following aspects: firstly, heat transfer oil is produced by mixing or adsorbing moisture in the air during storage and transportation. If the heat transfer oil mixed with water is heated to 100, it is very easy to cause boiling oil to overflow, causing an explosion or fire. Bag filtration makes the carbon residue of heat transfer oil exceed the standard. The heat exchange system is heated during operation. Under high temperature conditions, the heat transfer medium is cracked and Condensation reaction, producing a certain amount of colloidal polymer; A portion of the overheated medium will also produce coke, which is insoluble in oil and suspended in petroleum. These substances deposit at the bottom of the drum during combustion, and when overheated, they bulge and deposit on the pipe wall, forming an overheated tube explosion. Therefore, sampling and analysis of heat transfer oil should be carried out to timely grasp the quality changes of the oil, analyze the reasons for the changes, and timely supplement new heat transfer oil to stabilize the residual carbon content. It is necessary to pre dehydrate the heat transfer oil in the boiler and take corresponding measures in a timely manner if problems are found.
Sometimes, due to the high oil temperature, the use of a hot engine temperature cannot meet production requirements. Some units use forward and discharge methods to ensure heating, resulting in the outlet water temperature approaching or even exceeding the allowable temperature of the heat carrier, which exacerbates the degree of coking and scaling. The heat dissipation power of the radiator using the heat engine is low, forming a vicious cycle. In addition, due to the low flow rate, the temperature of most or some of the pipe walls in the heating surface is higher than the allowed oil film temperature, which shortens the normal service life of the heat transfer oil and causes overheating, bulges, and tube explosions. Therefore, the outlet oil temperature of the boiler should be around 30 ℃ lower than the working temperature of the heat carrier to prevent overheating, decomposition, and deterioration of the oil during use. When in use, the flow rate of the conductive oil inside the radiation heating surface pipeline shall not be less than 2m/s, and the convective heating inside the pipeline shall not be less than 1.5m/s to prevent carbon residue, blockage of the pipe diameter, and the formation of overheating of the pipe wall.

Assuming there is a problem with the welding point of the electric heater of the heat transfer oil boiler, and there are multiple evaporation points when the welding seam of the heat transfer pipe falls off or exceeds the temperature, causing many leaks of the heat transfer oil, and even causing vibration or even damage to the pipeline. The penetration ability of the heat transfer oil is strong, especially at the flange gasket, which is more severe. Fire accidents caused by encountering fire sources after leakage are common. Therefore, when selecting equipment, it is necessary to choose qualified equipment companies. Welding is preferred for pipeline connections, and flange connections are appropriate. Hydraulic hoists should use high-strength graphite products that are resistant to oil, pressure, and high temperature when connecting flanges. Hydraulic hoists should use high-strength graphite products that are resistant to oil and high temperature when connecting flanges. All accessories that come into contact with the heat carrier cannot choose non iron or cast iron. The pipe material should be 20 # seamless steel pipe, especially the fasteners, and the main circuit connecting bolts should be made of 35 # steel drum, which is more stable. Before the boiler burns, the boiler supervision office and equipment company should conduct a pressure test on all pipelines, valves, etc. until there are no leaks. The circulation time of heat transfer oil in the system pipeline should not be less than one hour. After careful inspection and confirmation, it can be put into normal operation.
In normal use, assuming that the oil heater occasionally experiences a sudden power outage, the circulating oil pump stops working, and the coal in the furnace continues to burn, causing the boiler oil temperature to continue to rise. Assuming that the oil temperature is too fast to drop, it will cause partial overheating and coking in a short period of time, resulting in overheating and pipe explosion fire. For this reason, when encountering power outages and other shortcomings, all furnace doors should be opened to immediately remove the remaining coal in the furnace, allowing cold air to quickly rush into the furnace and quickly reduce the furnace temperature. At the same time, the boiler oil drain valve should be opened to slowly put high-temperature oil into the oil storage tank, allowing the cold oil in the expansion oil tank to gradually flow into the boiler and take away heat in a timely manner. For units with conditions, a dual power supply can be set up, such as installing a small gasoline generator whose circuit switches with the circulating oil pump circuit to prevent high oil temperature in a short period of time after a power outage, thereby preventing unnecessary incidents caused by the power outage.