Why do heat transfer oil boilers have to be cleaned after coking and scaling?

According to the long-term practice of Wenzhou Nanxing Environmental Protection Company, which specializes in boiler maintenance, it has been proved that during the operation of the heat transfer oil boiler, carbon deposits and scaling will be generated due to:

Carbon deposition (coking): The heat transfer oil is easy to be oxidized during the heating process, and the acid value of the oil increases at high temperature, its kinematic viscosity gradually increases, and the residence time is prolonged, so cracking and thermal polycondensation reaction will occur. After cracking, small molecules are produced, volatilized at the same temperature, and the heat condensation reaction produces polymer products, which increases the viscosity of the oil, so that carbon deposits are generated inside the pipelines and equipment, which affects the heat transfer effect and accelerates the aging and failure of the heat transfer oil.

It may also overheat the furnace pipeline, damage the mechanical strength, and endanger personal safety in serious cases.

Scaling: The heat transfer oil transfers heat energy while producing gum, which adheres to the inner wall and is easy to form coking. In addition, if air enters, degradation and polymerization reactions are easy to occur, and the solubility of the high-boiling matter formed in the heat transfer oil reaches a supersaturated state, resulting in the formation of coking.

The operating temperature exceeds the design temperature of the heat transfer oil itself, and the contamination of corrosion products and impurities will cause coking to form on the inner wall of the pipe.

If carbon deposits and fouling are generated, it is very harmful:

Due to pollution, thermal degradation and polycondensation reaction, leakage of oxidation system, residues, corrosion products, overheating, colloidal deposition, small molecule volatilization and other factors, the viscosity, total acid number, moisture and acetone insoluble matter increase, low boiling matter and high boiling matter change and the change rate is large, causing poor heat transfer speed, pump cavitation, high vapor pressure, system overpressure and pump seal wear, reducing the oil transmission capacity of the oil pipeline, increasing friction resistance, increasing the energy consumption of transportation, and even sometimes leading to accidents such as initial condensation and flow stoppage.

A small amount of light components in the heat transfer fluid system are discharged through the exhaust line. Light components will cause low pump-out flow and cascading shutdowns. The recombinant components will lead to coking of the inner wall, increase the temperature difference between the inside and outside of the furnace tube, burn through the furnace tube, and even cause serious safety accidents. Pipes that are coking or clogged must be cleaned.

Insufficient heat conductivity will directly affect the quality of the product.

If the boiler is not cleaned, it will pollute the new oil, reduce its quality and shorten its service life.

Therefore, the heat transfer oil boiler must be cleaned after coking and scaling.

The heat transfer oil boiler is mostly heated by the heat transfer medium of the controlled temperature material indirectly through the heat exchanger, once coking and scaling occur, it will affect the heat exchange of the heat exchanger, and if it is not cleaned, a lot of heat will be lost.

For example, if the temperature of the heat transfer oil boiler pipeline system reaches 200 before coking and scaling, the material temperature can reach 200 after passing through the heat exchanger. When the heat transfer oil boiler piping system is coking and scaling, when the heat transfer oil temperature is 200, the material temperature may only reach 195 or even lower after passing through the heat exchanger.

If it is not cleaned, it will cause the pipe to be heated locally, which will seriously lead to pipe bursting, leading to disasters and major accidents.

It leads to a decrease in heat transfer speed, a waste of energy, and a serious temperature difference that causes accidents.

1. Decoking and cleaning: add the diluted cleaning agent to the guide hot oil furnace system, and fill it to the water level of the high tank 1 2. The amount of coke removal cleaning agent added:

12-72 hours, depending on the thickness of the scale.

2. Rinse and clean: After the cleaning of the heat conduction oil furnace and the acacia base, drain the residual liquid in the system, add clean water and rinse twice until the coke cleaning agent is free of foam and the water is clear. Temperature: 85-95, Time: 5-8 hours.

3. Water blowing steps: After the cleaning of the heat conduction oil furnace, connect the air compressor at the pressure check Kaili meter or other places that can be connected, use compressed air to boost the system to, and vent it at each low point, and so on until the water is blown out.

1. Decoking and cleaning: add the diluted cleaning agent to the guide hot oil furnace system, and fill it to the water level of the high tank 1 2. The amount of coke removal cleaning agent added:

12-72 hours, depending on the thickness of the scale.

2. Rinse and clean: After the cleaning of the heat conduction oil furnace, drain the residual liquid in the system, add clean water and rinse twice, and smile until the coke cleaning agent is foam-free and the water is clear. Temperature: 85-95, Time: 5-8 hours.

3. Water blowing steps: After the cleaning of the heat conduction oil furnace, connect the air compressor at the pressure gauge or other places that can be connected, and use the compressed air to boost the system to the bright air, and vent at each low point, and so on until the water is blown out.