Key Features

HRTOH-HLZ helicoidal-coil waste heat boilers are designed for systems in which process waste gases, or biogas / syngas obtained from gasifiers and similar equipment, are used as the heat source in order to meet heat demands for various purposes.

The vertical design with a helicoidal coil allows operation at high efficiency.

The helicoidal design is patented by Akkaya A.Ş. under number TPE-2006-00598 and provides significant advantages in thermal oil applications. This design eliminates the risk of cracking and degradation that results from the thermal oil remaining in the boiler for a prolonged period. In addition, with the helicoidal construction, the length of tube through which the oil circulates corresponds fully to the lengths obtained in the design calculations.

With heat transfer oils of suitable chemical composition, an operating temperature as high as 300°C can be reached safely, at an operating pressure of 6 bar.

Thermal oil boilers designed so that the oil velocity inside the coil is of the order of 2.5 – 3 m/s preserve the chemical structure and the heat-carrying ability of the heat transfer oil.

In order to obtain the required heat transfer surface, they are manufactured as towers connected in parallel, made up of wet-type helicoidal tube bundles joined in a sufficient number of groups.

The tube bundles in which heat transfer takes place can be added to one another in any required number, and this design provides capacity flexibility on HRTOH-HLZ boilers.

Pressure losses on the oil side and on the gas side are low. The investment cost and the energy consumption of the selected equipment are therefore lower.

Thanks to the service doors and the ease of dismantling, repair and replacement of the helicoidal tube bundles are straightforward.

The system is designed to maintain continuous operation if any problem occurs (leakage, corrosion, etc.). Because the tube bundles are independent of one another, only the bundle in which the problem has occurred needs to be blanked off until maintenance and repair are carried out, and the system can continue to operate without interruption on the other tube bundles.

Thermal bridges that could arise from the lifting and insulation support elements on the boiler shell are prevented, and heat losses are reduced to a minimum.

It can be manufactured with an open expansion tank or with a closed, nitrogen-blanketed expansion tank.

Automatic ash extractors fitted under each tower, and a compressed-air pneumatic boiler cleaning system for cleaning the spaces between the tube bundles, can be added according to the characteristics of the waste gas.

Thanks to optional systems that allow unattended operation, such as “Automatic Ash Removal System” and  “Automatic Tube Cleaning System“, efficient, stable and fully automatically controlled operation is achieved.

The flue gas filter selected to suit the chemical properties of the waste gas  (“Multicyclone”, “Cyclone”, “Wet Flue Gas Filter”,  “Bag Filter”) keeps emission values below the permitted limits.

High-quality safety equipment provides safe and stable operation.

Thanks to the PLC-controlled touchscreen control panel, operation is straightforward, and remote access from mobile devices makes fast technical support available anywhere in the world.

It is supplied with long-life insulation that reduces heat losses to a minimum.

Manufactured in accordance with EN12952 and the PED2014/68 CE directive.

Weld inspection on our boilers is carried out by non-destructive testing (NDT) within the scope and rates specified in EN 12952-6.

Our welded fabrication is carried out by our certified welders in accordance with approved WPS and WPQR. In manufacture, MIG-MAG and SMAW welding techniques are applied in accordance with the standards.

It is manufactured from high-quality certified boiler plate and seamless drawn steel boiler tube, in accordance with the requirements of the standards.

System Components

Akkaya high-efficiency helicoidal-coil waste heat thermal oil boiler

High-quality boiler oil inlet and outlet valve

Boiler oil inlet and outlet temperature sensor

Boiler oil inlet and outlet pressure transmitter

Boiler oil inlet and outlet pressure gauge and three-way connection valve

Boiler oil inlet and outlet pressure switch

Boiler oil inlet and outlet thermometer

Long-life thermal oil circulation pump group, one duty and one standby, complete with inlet and outlet valves, strainers, expansion joints and check valves

Boiler oil inlet and outlet vent valve

Ari Armaturen safety valve

Flue gas temperature sensor  

Boiler leak detection tank and accessories

Thermal oil filling pump and accessories

Deaerator tank and accessories

Expansion tank and accessories (open type or closed nitrogen-blanketed type)

PLC-based control panel with touch screen and remote access

Stack

Automatic ash removal system, automatic tube cleaning system (optional)