Abstract:
Processes and systems are provided that include introducing ammonia liberated from organic waste to a coal burner in a coal burning power plant, preferably for NO x removal at the power plant. The ammonia is preferably either ammonia liberated upon drying a mixture of organic waste and coal combustion by-products or ammonia liberated when organic waste is mixed with coal combustion by-products and one or more alkaline additives. Also provided are processes and systems of fueling a coal burner of a power plant with coal and either a dried mixture of organic waste and coal combustion by-products, or a mixture of organic waste, coal combustion by-products and one or more alkaline additives. The present invention is further directed to mixtures of either organic waste and coal combustion by-products, or mixtures of organic waste, coal combustion by-products and alkaline additives made by the processes of the present invention.
Abstract:
A process is provided for NOx removal at coal burning power plants, which includes introducing ammonia that is liberated upon drying a mixture of organic waste, coal combustion by-products, and optionally lime, having a pH of at least 9.5, to a coal burner in the power plant. A process is also provided for fueling a coal burner of a power plant with coal and a dried mixture of organic waste and coal combustion by-products. The present invention is further directed to the dried mixture of organic waste and coal combustion by-products made by the processes of the present invention, which may optionally be used as a soil additive or as a supplemental fuel.
Abstract:
A plurality of fluxing agent inlets (320) are provided at the lower part of a waste processing chamber (10) to enable the direct application of fluxing agents to deposited "unprocessed solids" and/or to liquid products of high viscosity therein. Means (46, 330, 600) are provided for sensing the presence of such blockages in the lower part of the chamber and for providing the fluxing agents thereto to remove the blockage.
Abstract:
One or more auxiliary plasma torches (20) are provided to a waste processing plant at strategic locations within the chamber (10) and directed towards the waste column. When a bridge (A) forms within the chamber the auxiliary plasma torches may be operated such as to provide an additional heat source where needed, quickly heating the organic solids, which thus pass through the bituminsation and charcoal formation stages quickly. The additional heat source may be in the neighborhood of the bridge, but may also be near the bottom end of the chamber, in which case the additional temperature at the bottom of the chamber effectively moves the combustion and gasification zones for the charcoal to a higher part of the chamber, altering the temperature profile. The heat source also enables the inorganic wastes to be heated rapidly to pass beyond the melting stage relatively quickly. The debridging process may be further enhanced by providing secondary plasma torches at various levels upwards of the primary torches, the secondary torches at any level being operated as and when needed to achieve the desired effect.
Abstract:
The invention relates to a method and a device for the autocombustion of a fuel comprising organic, vegetable or mineral materials, said device comprising a combustion chamber, at least one injection means for the combustible material, at least one air inlet, and means for evacuating hot fumes. The chamber (1) comprises a cylindrical jacket (11), the evaluating means comprise a duct (6) with the same axis as that of the chamber and the injection means (7) is arranged substantially tangentially in relation to the cylindrical jacket, in such a way that the combustible material is caused to move in a circular motion around the duct in the chamber.
Abstract:
The invention relates to a method for thermally disposing of fractions having a high calorific value and contained in refuse and/or residual materials in fossil-fired power plants, especially in coal-fired power stations with wet flue gas desulfurization. The inventive method is characterized in that the refuse/residual materials (2) is/are prepared and treated and is/are then compacted to form known pellets/briquettes or is/are subjected to a thermal treatment (homogenization) in order to form a coke-like material (15) and high-energy gas (7). In addition, the refuse/residual materials is/are optionally mixed with additives in a controlled manner according to required gas and coke analyses as well as to required quantities of gas and coal. The refuse/residual materials is/are directly fed into the coal stream in the discharging hopper and/or a coal belt, and/or in a steam generator hopper and/or a coal distributor in front of or in the area of a coal fall shaft and/or of a flue gas recirculation device. The refuse/residual materials is/are fed in a maximum proportion of 5 % with regard to the quantity of coal located in the coal distributor as from preferably 60 % of the firing capacity of the boiler, is/are fed together to a coal mill and is/are burned in the steam generator, whereby the high-energy gas (7) generated during the thermal treatment is fed by direct route to the steam generator (14) in a partial or complete manner, and is burned while partially or completely disposing of a separate purification (10).
Abstract:
A waste incineration method and a device therefor that incinerate waste, such as urban refuse, by using a grate incineration furnace, fluidized bed incineration furnace or the like while suppressing the concentration of dioxins, characterized, in that it is found that the S component or nitrides contained in sludge is effective in suppressing formation of dioxins, and waste, sludge, solid fuel, plastics and the like are mix-burned in a waste incineration system; in addition, the temperature of combustion exhaust gases and the SOx concentration after mix-burning are controlled, thereby reducing generation of dioxins.
Abstract:
In this process for more complete burning of waste, the substantially plastic waste is burned in a revolving tubular kiln (9) with the admixture of at least one finely ground solid additive (3, 4, 5) which contains at least one component with a melting temperature higher than the melting temperature of the plastic material.
Abstract:
Oxycombustion process wherein a combustor is fed with a fuel, a comburent and compounds under the form of coherent aggregates having Young modulus ≥104 MPa,the combustor being isothermal and flameless.
Abstract:
Oxycombustion process wherein a combustor is fed with a fuel, a comburent and compounds under the form of coherent aggregates having Young modulus ≥10 4 MPa,the combustor being isothermal and flameless.