Hot oil boiler
A hot oil boiler is a type of heating system in which oil is used as a heat transfer fluid.
In the heating industry, a boiler is usually referred to as a closed tank under pressure. which is used to bring the temperature of a fluid to its boiling point or to heat it. According to the type of heating and heating fluid, the boiler has the following types.
- Steam boiler: A steam boiler is a tank under internal pressure that turns water into steam in contact with fire.
- Hot water boiler: The hot water boiler transfers the heat received from the burner to the water and causes it to heat up, which is one of the most important applications of building heating facilities.
- Hot oil boiler: In heat transfer systems with hot oil fluid, a hot oil boiler is used to generate heat.
Today, hot oil boiler is widely used in industry, for example, it is used in industries that need to transfer heat indirectly. Considering the high importance of this device and its various uses, we are going to introduce the hot oil boiler and its uses.
What is a hot oil boiler?
A hot oil boiler is a type of heating system in which oil is used as a heat transfer fluid. This system consists of a boiler and spiral tubes containing oil. The heat generated through combustion is absorbed by these pipes and causes the oil temperature to rise. In this way, high temperature can be reached without the need to increase the pressure and create a system under pressure. But in other heating systems such as steam and hot water boilers, to achieve high temperatures, it is necessary to design a pressurized system.
The hot oil boiler is very safe and has economical and affordable maintenance costs and is widely used in heat transfer today.
What components does the hot oil boiler consist of?
The main components of a hot oil boiler include a shell and a spiral coil. The oil flows through the spiral coil using a pump. With the help of the combustion of a burner, the oil inside the spiral tubes of the coil is heated. In general, a hot oil boiler consists of the following parts:
- Shell and body
- Thermal coils
- Doors and bases
- pump
- Sensors
- Temperature and pressure indicators
- Oil inlet and outlet valves
- Burner
- Thermostat
- Oil storage source
- Line filling pump
- Panel and command circuit
- Control equipment
- Valves and fittings
What is the use of hot oil boiler and for what purpose is it used?
In traditional methods for heating the desired materials, they are usually placed in a container with a suitable alloy. And they heated under it. But it is not always possible to do this, especially when the materials themselves are flammable. For this reason, indirect heat transfer methods were invented. in which a fluid or gas is used.
In many industrial heating systems, water and steam have been used as heat carriers, but this method is not very safe. And due to the need to work at high pressure, it costs a lot. For this reason, one of the most important applications of hot oil boilers is in industries where heat transfer is done indirectly. With the help of this system, you can indirectly heat your desired materials up to a temperature above 400 centigrade. A hot oil boiler is used to heat flammable materials such as crude oil and natural gas. This system is a suitable alternative for steam boiler due to the use of thermal oil fluid (mineral or synthetic). In the following, we introduce some of the most important applications of this thermal system.
Hot oil boilers are widely used for providing heat at high temperature and low pressure in the projects of industrial facilities, various food industries. For example, this system is used to transfer heat needed in chemical industries with the aim of carrying out chemical reactions inside reactors. In addition, hot oil boilers are used to produce products such as glue and resin, solvents and all kinds of petroleum derivatives and to make refined oils because they require very high temperatures. Manufacturing of products such as waterproofing, artificial leather, candies and candies, chips and other fried foods, wood chipboard and MDF manufacturing industries are other applications of this type of heat transfer system.
Applications of hot oil boiler
The hot oil boiler is a popular heating system in places that are not connected to the gas network. Also, heating and lubrication of heavy oil materials in tanks, indirect heating of huge industrial baking ovens and making heating for printing stages in large printing houses and use in industrial dryers are among the applications of hot oil boilers.
Note that in industrial processes that require high temperatures, steam or hot water can. It can be used as a heat exchanger to reach this temperature, but since the initial costs of installing heat transfer systems under pressure are very high, the maintenance costs of these facilities are also high. It also increases the risk of explosion. Therefore, the use of thermal oils as a fluid can not only solve these problems, it also brings other important advantages that we will introduce in the following.
Advantages of hot oil boilers
In addition to lower working pressure, using hot oil instead of water and steam at high temperatures has other advantages, including the following.
- At atmospheric pressure up to 350°C. (The system only has a pressure that is created by the lubrication pump and does not exceed a maximum of 5 bars)
- Thermal oil does not cause corrosion in boiler spiral pipes and installations.
- The boiler does not suffer from calcification problems. Many boilers are removed annually. This is mainly because as the water temperature increases, some calcium and magnesium ions in the water continue to precipitate as the temperature increases. Therefore, these calcifications stick to the inner wall of the boiler.
- No ventilation is required for thermal oil.
- In winter and under natural weather conditions, its facilities do not freeze.
- You can use this system at different temperatures up to 350 degrees Celsius. However, if the temperature increases, the working pressure in the boiler will never increase.
- You can use hot water, boiling water or steam. If necessary, produce indirectly using this oil.
- Does not cause deposits in the installation site, does not cause stones and prevents the formation of corrosion.
- Unlike a steam boiler, the heating system of a hot oil boiler does not require a trained boiler operator.
- The hot oil boiler is safer than the steam boiler and is more efficient.
- It is easier to adjust its temperature and it takes less time to reach the required temperature compared to steam boilers.
Disadvantages of hot oil boilers
Compared to other heating systems, hot oil boilers have the following disadvantages:
- Thermal oil that must be used in the system has a high price.
- If there is a hole or oil leakage in the boiler, there is a possibility of fire, because thermal oils are flammable.
- Some thermal oils in the system crack at high temperatures and lose their natural properties.
- As the temperature of thermal oil increases and in contact with oxygen (air), it oxidizes and loses its natural properties, and after a short period of time, a deposit layer forms on the heating surfaces.
- Over time, thermal oil may lose its natural properties and need to be replaced.
How does a hot oil boiler work?
The hot oil boiler works in such a way that the temperature of the oil in the spiral tubes. It rises through the heat generated from the combustion of the burner. And as a result, the heat is transferred to the desired destination. If you need a very high temperature, special thermal oils should be used. This system works as a closed loop and thermal oils circulate inside the pipes. Note that heat transfer should be uniform. and the same to be transferred to spiral tubes containing oil. Otherwise, the temperature of the oil will increase locally.
Thermal fluids usually contain hydrocarbons and can be synthetic or organic and circulate through gas, diesel, electric, etc. burners. The heat transfer capacity of thermal oil is not the same as that of water. During heating, like water, natural circulation does not occur easily. That is why there is a need for circulation. There should be no stagnation point in the thermal oil in the hot oil boiler. And turbulent flow should be created. The speed of thermal oil in the boiler is about 1.5 to 5 meters per second.
Although there is not much pressure in hot oil systems, the valves and fittings used, such as control valves, safety valves, etc., should be made of PN40 class steel. Oil circulation pumps should also be cast steel. Thermal oils are usually produced from fully synthetic heat transfer oils. Mineral based oils can also be used.
Types of hot oil boilers
The hot oil boiler has two types, horizontal and vertical, each of which has its own advantages and disadvantages. But according to the required capacity, design and installation space, they are used. In places where there is limited space to install this system. or a small capacity is needed, a horizontal boiler is used. Also, according to the fuel of the boiler burner, they can be classified into diesel, gas, and multi-burner types (diesel, gas, and fuel oil).
Top manufacturers of hot oil boilers
Buyers of hot oil boilers often identify the right quality as a determining factor in their choice. The quality of materials and equipment used in these boilers plays a fundamental role in increasing the quality of the final product. Of course, only the quality of materials and equipment used is not enough. Knowledge and experience in making these boilers is also very important.
GARMATAJHIZ is considered one of the top companies in the production of high-quality hot oil boilers. This company has the ability to produce all kinds of hot oil boilers with different capacities. The brilliant experience and history of GARMATAJHIZ company in the production of hot oil boilers has attracted various buyers from all over the world. GARMATAJHIZ company has been producing high-quality hot oil boilers according to today’s standards for several years using its experienced experts.
Summary and Conclusion
In some indirect heating systems, water and steam are used, but at very high temperatures, these materials require very high operating pressure. By substituting thermal oil for water and steam, high temperatures can be achieved at much lower operating pressures. Hot oil boilers are an example of heating systems. which use thermal oils.
The hot oil boiler has a simple structure, and its main components include boiler, burner and spiral tubes. which are used to create heat exchange between oil on one hand and hot gases inside the furnace on the other hand. Note. This system has many technical and safety complications. which must be paid attention to, otherwise, it may cause a fire and cause financial or life damages. For this reason, it is recommended to buy this product from top manufacturers.
GARMATAJHIZ is considered one of the top producers of hot oil boilers. This company produces and markets high-quality hot oil boilers with the combination of experience, knowledge and suitable materials.
For consultation and purchase of this company’s products, you can visit its website at http://garma-co.com/.
