The process

Primco’s biomass plant takes care of every step in the process: from the supply of wood chips to the heating of about 5,000 homes.

In 9 steps

From the incineration of biomass in a wood-fired thermal power station to providing sustainable heating to entire urban districts in Lelystad, we explain the entire process to you in nine steps.

STAP 1 | From waste wood to stored wood

Residual products are extracted through necessary and responsible forest maintenance. By means of local transport they end up at the storage location, where they are reduced to wood chips.

STAP 2 | Wood chips to the incinerator

The wood, which meets NTA 8080 certification standards, is then deposited into a wood storage bunker.

STAP 3 | Wood goes into the incinerator

The wood chips are transported from the bunker to intermediate storage via the wood transport chain. The wood is pushed into the incinerator directly from intermediate storage.

STAP 4 | Incineration

The incinerators have a total capacity of 12.5 MW and a wood consumption of six to eight metric tons per hour at full load. The wood is dried, gasified, and burned down to ash. The interior of the incinerators is constructed from one-meter thick refractory concrete for safety reasons. The ash is deposited into the water reservoir.

STAP 5 | Processing flue gases (NOx-care)

At the end of the incinerator, the harmless compound urea is added to the flue gases to bind the nitrogen oxides (NOx → H2O + N2), so that the applicable emission standards are not exceeded.

STAP 6 | Heating the heating water

The hot flue gases, which measure approximately 1,000 degrees Celsius, pass through a boiler which heats up the internal heating water to 125 degrees Celsius.

STAP 7 | Filtering flue gases

After transmitting their heat, the flue gases arrive in a filter. Any ash particles carried along are thrown out through a cyclone filter, which acts as a kind of centrifuge, and then collected and discharged into the combined ash outlet.
The flue gases continue to the bag filter, where the last fly ash particles are captured in a special textile and the flue gases are further filtered. This ash residue is also transported via the combined ash discharge to the ash storage.

STAP 8 | Flue gas condensor

The flue gas condenser extracts the last remaining usable energy. The cold water is heated by absorbing the heat of the hot flue gases. This hot water is used for preheating and district heating.

The flue gas condenser also acts as an extra filter for any remaining ash particles. The ash particles bind to the water droplets and are discharged via the condensation water.
Only then do the flue gases leave the plant via the chimney. This immediately explains the plume of smoke that you can see coming out of the chimney: it consists of condensation and is comparable to warm breath that is visible in cold air when you exhale.

STAP 9 | Transfer to the district heating grid

The heated water transfers its energy via heat exchangers to the city networks of Vattenfall and Ennatuurlijk. The temperature of the city heat water goes to the city districts with a maximum of 110 degrees Celsius and returns with a temperature of around 50 degrees Celsius.