Vølund water-cooled combustion grate - the grate for high calorific waste
High availability and operational reliability
The water-cooled Vølund combustion grate is fully compatible with the traditional air-cooled Vølund grate. The stepped grate has a rigid design, specially developed for heavy-duty and high-temperature operation with high availability and operational reliability, ensuring minimal shutdown time for routine maintenance and cleaning.
|
Application: |
Features: |
|
|
Process advantages of the water-cooled Vølund grate
- Grate surface cooling is independent of combustion air so that air can be added and adjusted for optimum combustion
- Minimal corrosion due to low grate surface temperature
- Energy from grate cooling used for air preheating
- Constant high cooling water flows under the grate surface preventing boiling
- Low differential temperature over the grate results in low thermal stress
- Simple control
Grate design
Our water-cooled Vølund grate is fully compatible with the traditional Vølund air-cooled waste combustion grate, i.e. with the same modular design, lengths, widths, declination, vertical grate transition, etc. The air-cooled grate blocks on the grate girder are replaced by water-filled blocks, and thus water-cooled long blocks in the full length of each grate girder.
Our grate solutions can have partly or fully water-cooled sections. For example, the combustion grate sections can be water-cooled while the burn-out grate sections can be air-cooled.
The water-cooled grate has relatively few inlet holes for combustion air, which is injected at high speed. This largely prevents burned-out ash and molten metals such as aluminium from falling through the grate down into the primary air hoppers underneath the grate.
The water-cooling of the grate allows the operator to inject combustion air when considered necessary, and also to reduce the injection of combustion air to zero in certain areas because the water is doing the cooling, and the air is used for combustion of the waste only. For the same reason, preheating of the combustion air becomes a very flexible option which can be used in order to improve an optimal combustion.
How the grate works
The cooling water enters the bottom of the long block and flows down to the lower end, then goes up and flows along the grate surface in a separate upper chamber to the upper end and then down to the outlet close to the inlet at the bottom.
The heated water is cooled down again, typically in a heat exchanger to preheat the combustion air, or in a water heat exchanger connected to a district heating system.
Want to know more? Read about the air-cooled Vølund grate
Patented design
