A certain film processing company

Energy saving of thermal oil boiler

A certain film processing company

High-temperature processing is required for the production of packaging materials that require high hermeticity, such as food products, and high-performance films used for insulation and protection of substrates, etc.
Thermal oil boilers, which heat and circulate thermal oil at 300°C or higher, are used for such production.


Reason for Selection

Consider energy savings by replacing aging equipment

We had been using a thermal oil boiler since the plant was completed, and it had been breaking down more frequently due to age, so we thought we needed to replace the boiler before a sudden shutdown would affect the production line. In planning for a new boiler with higher efficiency than the existing one, we looked at several manufacturers and chose NTEC after considering all the factors, including their past maintenance support. We had asked them for very strict energy saving requirements, but the results exceeded our expectations and we are satisfied that we made a good choice.

Person in charge of plant engineering

NTEC’s Proposal

Thermal oil boiler
Thermo Heater

Thermo Heater

Air preheater to recover heat from exhaust gas for increased boiler efficiency

A thermal oil boiler, which can supply heat at high temperatures that are difficult to supply with steam boilers, is essential for the production of highly functional films. On the other hand, the exhaust gas from a thermal oil boiler tends to be high in temperature, resulting in a large heat loss. In this replacement, we proposed a thermal oil boiler equipped with an air preheater that recovers heat from the exhaust gas. By recovering heat from the exhaust gas and utilizing it for combustion air, the efficiency of the boiler is increased and fuel consumption can be reduced.
They also use our boiler for other production lines, and since they consider the use and importance of the boiler, we propose that they have spare parts for pumps and other important equipment in case of failure, and we also try to provide after-sales service so that they can say “No way! (Already?)” instead of “Not yet?”

Air preheater (in the back of Thermo Heater)
Air preheater (in the back of Thermo Heater)
Thermo Heater NH-100A (with air preheater)
Thermo Heater NH-100A (with air preheater)
System of Thermo Heater NH-100A

What is a thermal oil boiler (Thermo Heater)?

A thermal oil boiler is a boiler that heats circulating thermal oil instead of water. Since the boiling point of thermal oil is much higher than that of water, heat can be supplied at a high temperature of 300℃ at atmospheric pressure. Unlike a steam boiler, a thermal oil boiler doesn’t require water treatment such as water softeners or boiler chemicals. Thermal oil boilers are mainly used in industrial plants that require uniform heating at high temperatures, and for proper heat supply it is very important to control the temperature of the thermal equipment and piping as well as the boiler itself. We have accumulated a wealth of knowledge through our many years of experience, and we can offer boilers suitable for thermal equipment, as well as system design and construction work that can take advantage of them.


Thermo Heater (with air preheater)

Due to the high temperature of the thermal oil, the exhaust gas is discharged at a much higher temperature than in a steam boiler. Heat is recovered from the exhaust gas as combustion air, which improves the boiler efficiency.

Significant reduction in fuel costs by air preheater

Boiler efficiency up by approx. 6% as 6-month average
Fuel costs (LPG) Reducing fuel costs for the entire plant in just six months

Related Products

NH-100A (with air preheater)

● Specification
Output : 1,163kW
Max. working temperature: 300℃
Fuel: LPG

Factory introductions and case studies

Thermo Heater
NH Series

Model Output
NH-10 116 kW
NH-20 233 kW
NH-30 349 kW
NH-40 465 kW
NH-60 698 kW
NH-80 930 kW
NH-100 1,163 kW
NH-125 1,453 kW
NH-150 1,744 kW
NH-200 2,326 kW
NH-250 2,907 kW
NH-300 3,488 kW
Thermo Heater NH Series

High temperatures at atmospheric pressure

A thermal oil boiler “Thermo Heater” uses thermal oil instead of water, which generates pressure at temperatures above 100℃, and the pressure rises sharply, such as about 4 MPa at 250℃ and about 15 MPa at 340℃. This means that in a steam heating system, your plant must be equipped with high-pressure equipment, and strict safety devices and water treatment are required, but this is not necessary for the Thermo Heater.

Structural drawing of Thermo Heater

Low operating costs

Since thermal oil is circulated and utilized indirectly in a closed system, there is no loss resulting from such as leakage, flash, blowdown and drainage (which typically cause 10-15% loss), and operating costs are low because the electrical power required during operation is minimal.

Uniform heating

Since thermal oil is used in the liquid phase, a small pipe diameter is sufficient for the Thermo Heater, and the temperature of the thermal oil hardly drops even in long-distance piping. It also prevents uneven temperatures and ensures uniform heating.

Precise temperature control

The Thermo Heater can control temperature easily, freely and precisely.

Available for many applications

The Thermo Heater can be used for many applications with different temperature conditions and also for both oil heating and oil cooling.

Application exapmle

Other various specifications also available

  • 390 spec. for silicon high-temperature thermal oil
  • Boiler with an air preheater recovering heat from exhaust gas (improved efficiency up to 92% depending on conditions)
  • Boiler with a dual fuel (oil/gas) burner
  • Boiler using by-product oil and by-product gas as fuel, etc.