General
- Forced circulation exhaust gas boiler/economizer
- Water tube boiler with gilled tubes for exhaust gas
- Robust, well-proven construction, able to withstand vibrations and exhaust gas pulsation
- Heating surface composition which ensures the required output from the most compact unit
- Efficient, well-proven cleaning system with steam or air soot blowers
- Stationary water washing system
- Superheater and preheater as option
Design data
| Capacity: |
0.5 - 5.0 t/h |
| Design pressure: |
up to 24 bar(g) |
| Steam pressure: |
up to 22 bar(g) |
Description
The UNEX™ G exhaust gas economizer is a water tube, forced circulation economizer designed for heat recovery from diesel engine exhaust gas.
The heat transfer surface consists of horizontal finned (gilled) twin steel tubes preventing vibrations from gas pulsation. The heating surface is covered with gas-tight steel casing.
Special attention is paid to flexible construction. Each twin tube can expand freely in relation to the end plate and other tubes in order to minimize thermal stresses. The heat transfer surface is divided into vertical sections facilitating the tube repair work.
Economizers are arranged with horizontal spaces for steam sootblowers at certain intervals. Vertical and straight exhaust gas passage with adequate spacing between the fins decreases soot build-up on surfaces. The spacing is determined depending on the type of the engine and the required heat transfer surface area. The heating surface dimensions are laid out to maintain sufficient gas velocity giving the best self-cleaning effect within the design limits.
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