The Reject-to-Power Method
Reject-to-power plants can be fuelled using fine and large grain waste, as well as fibres mixed with bio-slurry from the processing of used paper. Biomass residues and surrogate fuels can equally be used. The plants are conceived in such a way that fuels with varying water content and calorific values can be employed. The mixture of fuels can also be changed once the plant is in operation.
Balance of Fuels
In a first step, the available fuels are shredded and any metal is removed. This preparation process homogenises the fuel mixture. Once prepared in this fashion, the fuel is stored in silos, from which the optimal combination of different fuels can be selected as and when required.
Conveyance and Loading
The fuel mixture is thrown into the furnace, which ensures an even spread of fuel across the grate. The firebed remains small, and it is possible to respond quickly to changes in load. The process is characterised by extremely low carbon and hydrocarbon emissions. Primary and secondary air intakes and flue gas recirculation make automatic operation possible, even when fuels with varying characteristics are used.
Ash is pushed back in the direction from whence the fuel is thrown by a reciprocating grate. An end zone with separate air intake ensures that the ash burns off completely. The ash is removed and stored in a silo.
The heat from the furnace is used in a heat recovery boiler to produce steam, the characteristics of which are adapted to suit the relevant requirements for heat or electricity production by means of a steam turbine.
Flue Gas Purification
An important component of the plant is the flue gas purification unit, which consists of an SNCR unit to reduce NOx emissions and a dry scrubber to remove the sour elements of the exhaust. The reaction products from the flue gas purification and any particles are reliably caught in a baghouse filter. The flue gas purification unit is constructed using the latest technologies and stays well within European and national emission limits.
REJECT POWER makes it possible to make efficient use of waste materials that arise, including biomass, thereby solving two challenges facing industrial plant operators at the same time. The incineration of waste materials reduces energy and disposal costs. The residual heat from the incineration process is used in a heat recovery boiler to produce either hot water, or low or high-pressure steam, the characteristics of which are adapted to suit the relevant requirements for heat or electricity production by means of a steam turbine.
The SAICA packaging factory in Partingon (UK) is our reference project; at this facility, up to 250 tonnes of waste are incinerated in an environmentally friendly fashion. The residual heat from the furnace is used to produce steam, which is then employed in the production of cardboard.
Optimal for industrial plant operators: You use less fossil fuels, reducing both your energy costs and your carbon emissions. Disposal costs for bio-slurry, fibres, and residues are eliminated.