Biomass gasification

Organic matter such as residues from wood, agricultural crops, etc. all contains chemical energy and is categorized as biomass. If we combust this biomass, the chemical energy is transferred into another energy carrier – heat. The heat can in turn do some type of work, for instance dry grains, heat a building, melt a material, run an engine or boil water. However, if we instead gasify the biomass we create an energy carrier – gas, that has a higher energy density and will result in a more complete combustion once the gas is combusted. To create a fire or combustion, three parts are needed: something burnable, oxygen and heat. Gasifying means that we expose the biomass (burnable material) to heat, but the amount of oxygen is lower than for combustion and thus a combustible gas is created. There are different gasification principles, for instance updraft, downdraft, fluidized bed, dual beds etc. Meva Energy’s uniqueness lies in our patented gasification technology that is based on an entrained flow gasifier.

Meva Energy’s gasification principle

Meva’s technology is a biomass gasification system of entrained flow gasifier type. The gasification reactions take place in a dense cloud of biomass particles that is blown into the preheated gasification reactor where it forms a vortex (whirl) spinning down the reactor and allowing the particles to be gasified into renewable syngas.

Meanwhile the resulting biochar is separated from the renewable gas due to the centrifugal forces of the cyclone. When reaching the bottom walls the almost particle free renewable gas changes direction and flows back up where it exits in a centrally located pipe. The separated biochar is however forced down towards the bottom where it is collected. Contrasting to most gasifiers of entrained flow type, the Meva technology is fed with air and not oxygen, thereby constituting a far less expensive solution. Meva Energy has filed several patent applications covering key functionality of the technology.

The most important feature of the technology is its ability to produce true high quality gas.

What does our technology lead to?

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What could you do with the decentralized produced renewable gas?

The Meva process

Meva Energy´s technology is a complete system from gasifier to syngas cleaning for production of renewable fuel gas which is fed to a power engine genset for distributed production of power and heat. Alternatively the resulting renewable gas can be used to replace fossil gases such as natural gas or propane in e.g. an industrial drying process.

The system is designed as a closed loop leaving no residues other than biochar. Also, the entire system is fully automatized and is designed to be remotely and continuously operated.

The most important feature of the technology is its ability to produce true high quality gas. It all started with the fundamental engineering insight that in order to achieve a defined result you need to define the starting point.

For the Meva technology that is manifested by specifying the feedstock particle size to a maximum of 1 mm. If it is larger, it needs to be grinded. But the output of that extra effort is just great, the system produces gas with extraordinarily even quality. This is due to the inherent continuous character of cyclone gasification of small fraction feedstocks and the avoidance all sorts of batch-like injecting and ejecting resulting in sudden changes of process conditions. Thanks to this, we are able to use our syngas with highly effective lean burn combustion engines – a unique ability within the gasification industry.