Cooling & DH
In biomass plants with high efficiency are there two types of gas coolers:
Approximately 2/3 of the energy is recovered in the high temperature cooler and 1/3 of the energy is recovered in the low temperature cooler.
Dall Energy have developed a concept, where the flue gas is cooled by a high temperature quench. Hereby is the investment and maintenance costs of the boiler reduced.
The plants in Sønderborg and at Warwick Mills was a first step to demonstrate the concept. Here a compact boiler is cooling the flue gas to app 400C before the quench.
Boiler free biomass plant
The ultimative solution is a boiler free biomass plant. Here are the investment- and maintenance costs of the boiler eliminated. Such project is being prepared in Holte, Denmark.
Principle layout of the "Boiler free biomass plant" in Holte.
Air moisturizers are used to warm up and moisturize the combustion air and to cool the condendate.
System layout with high temperature quench, recirkulation of particles to furnace and airmoisturizers