Hot Oil Boilers And Systems

Hot Oil Boilers And Systems

Heat Transfer Oil System

Organic heat transfer systems in accordance with EN4574

  • fuel oil
  • natural gas
  • liquid fuels
  • solid waste fuels
  • coal
  • wood and sawdust
  • pomace
  • rice husk, nutshell

Liquid output temperatures

  • 330° C with mineral oils
  • 370° C with synthetic oils
  • 550°C with heat transfer salt solution circulation
  • Thermal Efficiency

Up to efficiency regardless of fluid temperature, using flue gas to heat combustion air
Minimum combustion air and high efficiency with Oxygen Control System

Liquid - Gas Fueled Boilers

  • Vertical or Horizontal Placement
  • Heat recovery and high efficiency with addition of Recuperator
  • Easy cleaning and maintenance
  • Long lived heat transfer fluid
    • Hardware and design that does not cause thermal cracking
    • Design that prevents oxidation of heat transfer fluid

Solid fuel boilers with rotary grates
Solid fuel heat transfer systems can use wood industry byproducts as fuel. It offers economical solutions by burning waste wood pieces (sawdust, wood chips, high bark, wood veneer scraps, etc.) in the heating system. Other solid fuels (pomace, coal, wood, packaging and paper wastes, etc.) are used to meet the high temperature heat requirement of facilities such as packaging, textile, chemistry, food, feed industry.

Cheap energy provision with waste fuel

Production residues from wood; bark, chips, sawdust, wood veneer scraps or other wastes, for example; olive pomace, charcoal powder, palm fibers, nutshells from nuts and peanuts, pulp or straw, etc. All of these can be used in solid fuel heating systems, and they are valuable heating resources. As an example, the heating value of bark; 17 m3 (1 m3 shell is approximately 375 kg) bark means 1000 liters of fuel oil saving.

Incinerable waste will be a constantly cheap fuel source for operation, although the price of other petroleum fuels will constantly increase. An additional benefit that it will provide is the inconvenience and cost of waste disposal being eliminated.

Typical applications for solid fuel hot oil systems

Solid fuel heating systems are produced for industrial facilities where high and precise temperature control is required. The main applications are;

  • Foil press machines
  • Plywood press machines
  • Driers
  • Heated pools
  • Lamination
  • Heating of sealing lathes
  • Solid fuel heat systems will provide similar advantages for all sectors operating in industries such as wood, textile, food, etc.

Modular Design, Compact Construction

Serpentine heater and combustion chamber, cyclone dust filter, economizer and fuel feed bunker are collected to form a compact unit. All these structural elements are pre-installed and checked in our factory after manufacturing. The system, which is disassembled after the installation and test phase, is easily re-installed in the operation, thus minimizing transportation and assembly costs. At the same time, a minimum settlement area is provided within the facility.

The manufacturing and installation efficiency of the systems is guaranteed by the use of international standards and standard materials as stated in EN4754 and EN12952. Manufacturing and material selections are made and certified in accordance with CE directives.

We should point out that in the design and engineering services of hot oil systems, the utmost attention to these requirements are fully implemented. The combustion chamber is manufactured in appropriate sizes, the hot oil system is in accordance with the EN4754 standard, the boiler construction, manufacturing and material selection using serpentine pipes in accordance with EN12952 and EN17175 standards.

Our company manufactures with high quality, proven, certified materials. The necessary parts of the productions made by the experienced and EN 288 standard certified welders and installers, are radiographically controlled.

Maximum Benefit From Heat Transfer Oil

Thermal breakdown of oil with low heat transfer per surface area; In accordance with the EN 4754 standard, prevention of thermal cracking is guaranteed by the modulation operation of the oil flow control and combustion system as stipulated by design.

Meanwhile, special measures have been taken to prevent thermal oxidation, which shortens the life of the heat transfer oil.

By doing these, we increase the service life of the heat transfer oil to more than 5 years.

Accessory materials are equally important, for example; burner, pumps, valves, strainers, compensators, check valves, control equipment, etc.

*** All of these equipment are products of certified and proven companies.

Hot oil boilers are designed to work under these conditions;

For mineral based heat transfer oils: 330°C, 10 bars

For synthetic heat transfer oils: 360°C, 10 bars

For heat transfer salts: 450°C, 10 bar

The system will normally be operated at a pressure equal to the pressure created by the pump, ie at a maximum pressure of 5.5 bar. This means; that the system is very safe and reliable.

Solid fuel hot oil boiler system capacities are between 600.000 Kcal / h - 8.000.000 Kcal / h (700 - 9.300 KW). Waste combustion hot oil boiler and its armatures - economizer - cyclone filter - water absorber filter section are designed in a compact way that requires minimum space.

Maximum effective combustion is achieved with "gasification combustion" and a cooled combustion chamber, even wet materials can be burned 100% (wet basis) or 50% (dry basis) effectively. The system can be operated fully automatically, the maintenance requirements are at minimum level and the economic payback is less than 1 year according to the operating time. Another expression of these factors means a significant decrease in investment expenses.


In solid fuel hot oil systems, 2 types of combustion chambers are manufactured depending on the boiler capacity.

Cylindrical combustion chamber with fixed grate; WOOD, TIRE, PLASTIC WASTE, HIGH-CALORED COALS for fuels with a capacity of up to 3.000.000 Kcal / h and low ash content

Rotary grate combustion chamber; Suitable for all kinds of fuel, up to 600,000 -8,000,000 kcal/h capacity


With this grate design, which is very suitable for ashes melting at low temperatures, cheap poor quality coal can be burned. The grate has the feature of scraping off the melted and clumped ashes during discharge.


· In order for the combustion to be perfect and the boiler to work with high thermal efficiency; Yeşil Çevre applies proportional control system for fuel and air delivery in the combustion chamber. Fuel fed proportionally according to the thermal load is burned with the air given to the combustion chamber from 4 zones, in addition to this, the secondary combustion air given at the exit of the combustion chamber enables the burning of unburned volatiles.

· In fixed grate systems, fuel is delivered into the boiler with thread stoker or pneumatic transmission, depending on fuel type and size.

· In the rotary grate system, fuel of all types and sizes is laid on the grate from the bunker, the laying thickness is kept at a constant height on the grid with the guillotine, thus a thin fuel layer that will ensure complete combustion is obtained. For fuels with high volatile matter ratio, the secondary air ducts at the exit of the combustion chamber enable the volatiles to be burned again.

· Ash is taken out from the ash chamber at the end of the rotary grate combustion chamber via stoker and it is cooled by wetting.

With these systems, it is possible to work 24 hours a day. Maintenance and cleaning is done in an extremely simple way, the surface of the serpentine heater can be cleaned even during operation.
Heat transfer oil maintains its properties even after years in hot oil systems.


Heat recovery; Energy costs are reduced by utilizing hot flue gases.

Wherever there are industrial exhaust gases, these gases are released into the atmosphere at high temperatures. It should be noted that it can be provided with a heat recovery system (economizer). Fuel consumption will be significantly reduced, or capacity will increase without additional fuel consumption. Additionally, the potential for operating costs is preserved, and heat recovery will also reduce the environmental impact of a production process.

Heat recovery covers different systems, these are designed individually with expertise within the framework of various needs and customer demands. The applications are wide-ranging: similar process types are used in the food production industry, the chemical industry, the wood industry, the textile, plastic, glass, ceramic industry, as well as the iron and steel industry, power plants.

Heat recovery systems are manufactured with high quality and high safety standards.

Sadece yeni tesisler de değil, aynı zamanda halı hazırda olan tesislere adapte edilebilir bu sayede tesiste daha verimli çalışma şartları sağlanır.

Örneğin; baca gazı sıcaklığının yalnızca 100 °C indirgenmesi ile, ısı üretim tesisinin toplam kapasitesi % 5 artırılmış olacaktır. Sisteme göre, % 30 ve daha fazlası da başarılabilir. Enerji giderleri oldukça azaltılmış olacaktır.

Heat recovery from hot flue gases can be used for a wide variety of purposes. Energy recovered by heating thermal oil can be transmitted to many parts of the enterprise through pipelines, the energy transmitted in this way can be used;

  • In air and water heaters
  • In the production of heat for heating
  • In industrial furnaces
  • In Drying of solid fuels

More precisely, heat is required in steam production, which is necessary for many users. Wherever there are industrial exhaust gases, these gases are released into the atmosphere at high temperatures. It should be noted that it can be provided with a heat recovery system (economizer). Fuel consumption will be significantly reduced, or capacity will increase without additional fuel consumption. In addition, operating expenses are also preserved, while heat recovery also reduces the environmental impact of a production process.


    Dust particles are kept by multi cyclone filters.
    In the next stage after the cyclone, the flue gas is washed with water and harmful gases and fine dust that cannot be kept in the cyclone are removed.
    Particles that cannot be precipitated with water are filtered to a particle size of 0.01 micron in bag filters made of special fabrics.