As a supplier of oil fired thermal oil boilers, I understand the critical role of water quality in the auxiliary systems of these boilers. The auxiliary systems, which include water treatment, cooling, and feedwater systems, are essential for the efficient and reliable operation of the boiler. In this blog post, I will discuss the requirements for water quality in the auxiliary systems of an oil fired thermal oil boiler.
1. Water Treatment System
The water treatment system is designed to remove impurities from the water before it enters the boiler. These impurities can include dissolved solids, suspended solids, and dissolved gases. If these impurities are not removed, they can cause a variety of problems in the boiler, such as scale formation, corrosion, and foaming.
Dissolved Solids
Dissolved solids are minerals and salts that are dissolved in the water. These solids can include calcium, magnesium, sodium, and chloride. When the water is heated in the boiler, these solids can precipitate out of the water and form scale on the heat transfer surfaces. Scale can reduce the efficiency of the boiler by insulating the heat transfer surfaces and preventing the transfer of heat from the combustion gases to the thermal oil.
To prevent scale formation, the water treatment system should be designed to remove dissolved solids from the water. This can be achieved through a variety of methods, such as ion exchange, reverse osmosis, and evaporation. Ion exchange is a process in which the dissolved solids are exchanged for other ions, such as hydrogen or sodium. Reverse osmosis is a process in which the water is forced through a semi-permeable membrane, which removes the dissolved solids. Evaporation is a process in which the water is heated to its boiling point, and the steam is condensed to remove the dissolved solids.
Suspended Solids
Suspended solids are particles that are suspended in the water. These particles can include sand, silt, and organic matter. Suspended solids can cause abrasion and erosion of the boiler components, such as the tubes and pumps. They can also clog the water treatment system and reduce its efficiency.
To prevent the problems caused by suspended solids, the water treatment system should be designed to remove these particles from the water. This can be achieved through a variety of methods, such as filtration, sedimentation, and coagulation. Filtration is a process in which the water is passed through a filter, which removes the suspended solids. Sedimentation is a process in which the water is allowed to settle, and the suspended solids are removed from the bottom of the tank. Coagulation is a process in which chemicals are added to the water to cause the suspended solids to clump together and settle out of the water.
Dissolved Gases
Dissolved gases are gases that are dissolved in the water. These gases can include oxygen, carbon dioxide, and nitrogen. Oxygen can cause corrosion of the boiler components, such as the tubes and pumps. Carbon dioxide can react with the water to form carbonic acid, which can also cause corrosion. Nitrogen is an inert gas, but it can displace oxygen in the water and reduce the efficiency of the boiler.
To prevent the problems caused by dissolved gases, the water treatment system should be designed to remove these gases from the water. This can be achieved through a variety of methods, such as deaeration and chemical treatment. Deaeration is a process in which the water is heated to its boiling point, and the steam is vented to remove the dissolved gases. Chemical treatment is a process in which chemicals are added to the water to react with the dissolved gases and remove them from the water.
2. Cooling System
The cooling system is designed to remove heat from the thermal oil and maintain its temperature within a safe operating range. The cooling system typically consists of a heat exchanger, a cooling tower, and a pump. The heat exchanger transfers heat from the thermal oil to the cooling water, and the cooling tower removes heat from the cooling water by evaporating a portion of it.
Water Quality Requirements for the Cooling System
The water quality requirements for the cooling system are similar to those for the water treatment system. The cooling water should be free of dissolved solids, suspended solids, and dissolved gases. In addition, the cooling water should have a low pH and a low hardness to prevent corrosion and scale formation in the heat exchanger and the cooling tower.
To prevent corrosion and scale formation in the cooling system, the water treatment system should be designed to treat the cooling water. This can be achieved through a variety of methods, such as chemical treatment, filtration, and ion exchange. Chemical treatment is a process in which chemicals are added to the cooling water to prevent corrosion and scale formation. Filtration is a process in which the cooling water is passed through a filter to remove suspended solids. Ion exchange is a process in which the dissolved solids are exchanged for other ions to reduce the hardness of the cooling water.
3. Feedwater System
The feedwater system is designed to supply water to the boiler. The feedwater should be free of impurities and have a high quality to prevent problems in the boiler, such as scale formation, corrosion, and foaming.
Water Quality Requirements for the Feedwater System
The water quality requirements for the feedwater system are similar to those for the water treatment system and the cooling system. The feedwater should be free of dissolved solids, suspended solids, and dissolved gases. In addition, the feedwater should have a low pH and a low hardness to prevent corrosion and scale formation in the boiler.
To prevent problems in the boiler, the water treatment system should be designed to treat the feedwater. This can be achieved through a variety of methods, such as chemical treatment, filtration, and ion exchange. Chemical treatment is a process in which chemicals are added to the feedwater to prevent corrosion and scale formation. Filtration is a process in which the feedwater is passed through a filter to remove suspended solids. Ion exchange is a process in which the dissolved solids are exchanged for other ions to reduce the hardness of the feedwater.
4. Conclusion
In conclusion, the water quality requirements for the auxiliary systems of an oil fired thermal oil boiler are critical for the efficient and reliable operation of the boiler. The water treatment system, cooling system, and feedwater system should be designed to remove impurities from the water and maintain its quality within a safe operating range. By ensuring that the water quality in the auxiliary systems is appropriate, you can prevent problems in the boiler, such as scale formation, corrosion, and foaming, and extend the life of the boiler.
If you are interested in purchasing an oil fired thermal oil boiler or need more information about the water quality requirements for the auxiliary systems, please feel free to contact us. We are a leading supplier of Oil And Gas Fired Thermal Oil Boiler, Diesel Oil Fired Thermal Oil Boiler, and Skid Mounted Thermal Oil Boiler. Our team of experts can provide you with the guidance and support you need to select the right boiler for your application and ensure that it operates efficiently and reliably.
References
- ASME Boiler and Pressure Vessel Code
- API Recommended Practice 537
- National Fire Protection Association (NFPA) 85