Biomass Gasification Plants

Biomass gasification may become a key technology in the future energy market.
Electricity, biofuels and heat can be produced with high efficiencies by use of biomass gasification.
Several different biomass gasification technologies are under development, aiming at different applications and markets. For many applications, such as gas turbines, gas engines, synthesis processes as well as fuel cells, it is important that the produced gas is cooled and cleaned.

Dall Energy provides simple and reliable gas cooling and cleaning technologies for gasification plants.

Standard gasification plant

Agricultural residues

Agricultural residues are characterized by being cheap and plentiful in many regions. Hence there is a strong interest in having reliable systems that can utilise agricultural residues as fuel. However, these fuels often have a high content of ashes with alkali metals (e.g. potassium) and chlorine, which cause technical problems in the gas cooler.

As the gasifier operates at about 800°C, the alkali metals and chlorine are in gas phase. When the gas is cooled after the gasifier, the alkali metals and chlorine form salts. These salts are sticky, and they build up and clog in traditional heat exchangers.

Dall Energy gasification plant

Simple cooling

Dall Energy propose a new simple and reliable solution to cooling product gas in biomass gasifiers.
In our solution, the product gas is cooled by use of evaporative cooling.
The cooling is done by injection of water droplets into the hot gas. As water has high evaporation energy, the gases are cooled effectively, while the water evaporates.

Gas cleaning

The cooled gas can be cleaned with traditional gas cleaning technologies, e.g. bag filters.

Heat recovery

After the gas cleaning unit, the energy of the product gas can be recovered in a condensation unit such as a scrubber system or a shell and tube heat exchanger.