WASTE-FIRED BOILER INSTALLATIONS

The highly efficient HoSt waste-fired boiler installations are capable of firing waste for the production of renewable heat, power and steam with the lowest emissions.

Applications are for example district heating, power generation, industrial steam for industrial processes, such as breweries, paper/carton factories, cheese factories and heat and CO₂ for the greenhouse horticulture.

Waste such as chicken manure and poultry litter, refuse-derived fuel (RDF) and sewage / municipal sludge / wastewater. Combustion or incineration of sludge has, besides renewable energy production, the advantage of eliminating the sludge. This way, waste is not wasted but used as a useful source for valuable end-products.

Optimized waste-fired boiler technology

HoSt designed the waste‐fired boiler accordingly to the IED (Industrial Emissions Directive) rules. The WID (Waste Incineration Directive) was recast within the IED rules. The flue gases are cooled down in an empty radiation draft. This way, the flue gases come below ash‐melting points before they will hit the convection parts of the boiler. The boiler is equipped with soot blowers to clean the boiler, even when firing the high ash contents in waste fuels. These two characteristics are typically not applied in a standard wood fired boiler. The boiler is designed to handle high ash load, high temperature chlorine corrosion and low temperature acid dew point corrosion problems.

Pre-treatment & Flue Gas Cleaning

In the HoSt waste-fired boiler installation, rejects and RDF fuels are first pre‐treated by shredding down to below 250mm. The iron and aluminium are taken out as much as possible. The firing grate is cooled with recirculation of flue gases. This system is a state‐of‐the‐art technology and requires less maintenance than water cooled grates. The furnace is designed with 3 stages of air and with flue gas recirculation. By doing this, a controlled combustion takes place and evaporation of unwanted elements is minimized (including thermal NOx). HoSt’s flue gas cleaning technology is applied for the lowest emissions.