Übersetzung für "Bed ash" in Deutsch

Known fluidized-bed combustion chambers operate with a strictly stationary fluidized bed and without ash feedback.

Moreover, a recycling of the bed ash drawn off from the combustion chamber is also customary.

If you're lucky, and you dig a place like that, you actually find the ash bed to dig it, and we did.

This invention relates to a process of gasifying solid fuels in a fixed bed with oxygen, steam and/or carbon dioxide as gasifying agents passed through the fixed bed from below, wherein the gasification residues are withdrawn under the fixed bed as solid ash or liquid slag and the fixed bed is charged with solid fuels through a lock chamber and with tar through a supply conduit, and to a reactor for carrying out the process.

Suitable processes, in which the fuel is kept in a fixed bed and the incombustible mineral constituents of the fuel are withdrawn under the fixed bed as solid ash, are described, e.g., in Ullmanns Enzyklopadie der technischen Chemie, 4th edition (1977), volume 14, pages 383 to 386.

This invention relates to a process of gasifying solid fuels with gasifying agents that contain oxygen, water vapor and/or carbon dioxide, wherein coarse-grained solid fuels in particle sizes of at least 2 mm are gasified under a pressure of 5 to 150 bars in a fixed bed while said bed is slightly descending, the gasifying agents are introduced into the fixed bed from below and the incombustible mineral constituents are withdrawn from the lower end of the fixed bed as solid ash or liquid slag, and wherein fine-grained solid fuels are gasified in a fluidized bed under a pressure of 1 to 100 bars.

For load-bearing building components, it is advantageous, depending on the intended application, to replace up to about 90% by weight of gypsum, that is to say calcium sulphate alpha- and if appropriate beta-hemihydrate by a substitute in the form of ground blast furnace slag, sand and/or lignite ash and/or bituminous coal ash and/or fluidised bed ash, the substitutes preferably having a Blaine specific surface area greater than 3000 cm2 /g.

The use of fluidised bed ash for the production of additive materials, for example for lightweight concrete or dry building plates and panels is referred to in German laid-open application (De-OS) No 38 08 519.

German laid-open application (De-OS) No 33 24 708 discloses the use of fluidised bed ash in building materials for underground working or mining, for example for building dams or embankments, columns or piers.

The solids (coal or bed ash) that are supplied by conveyor air through inner pipe 13 emerge through the outlet 5 from pipe 4, are gently deflected at deflection surface 9, and arrive in the fluidized bed through outlet cross-section 10.

I claim: A process for treating aqueous condensate obtained by the cooling of raw gas produced by the gasification of granular solid fuels with gasifying agents which contain oxygen, water vapor and carbon dioxide under a pressure of 5 to 100 bars, wherein the fuels constitute a fixed bed which descends slowly and the incombustible mineral constituents of the fuel are withdrawn below the bed as solid ash or liquid slag, comprising the steps of:

This contrast is largely due to the re-categorization of fluidized bed ash from the power plant at the Chempark Leverkusen site, which now has to be classified as hazardous waste.

Direct firing or introduction of thermal energy in the form of hot bed ash and bed material from the gasifier is also possible.

The substoichiometric combustion/gasification of the solid fuel (e.g., biomass, household waste, or substitute fuel, but also coal) takes place in fluidized bed 54, which is continuously renewed by, preferably jointly, introducing fuel and sand, as indicated by reference numeral 55, and by discharging combustion bed ash and sand, as indicated by reference numeral 56 .

Due to the gas flow over the ash bed, which is required for the cooling according to EP-A-0 252 967, EP-A-2 665 971 and DE 10 2009 060 305 A1, this involves introducing a relatively large quantity of air into the internal space of the corresponding conveying device.

The problem of dust formation—which arises in the methods according to EP-A-0 252 967, DE 10 2009 060 305 A1 and EP-A-2 665 971 and is caused by the fact that air is introduced over the ash bed or through the ash bed and thus, necessarily, an air-solid mixture is produced during the transport of the solid residues—can thus be avoided by means of the invention.

Against this backdrop, EP-A-2 665 971 for example proposes a device for cooling ashes from a combustion chamber, comprising a conveyor belt whose conveying surface is provided with openings in order to allow a flow of air through the conveying surface and through the ash bed.

By the mixing together of the ash mixture coming from the combustion chamber of the circulating fluidized-bed firing system (ash, reaction product, and unreacted SO 2 sorbent) with water or with an aqueous, sodium-containing solution in a mechanical mixing unit at a reaction temperature of 60° to 100° C. and at atmospheric pressure, and by recycling this into the combustion chamber of the circulating fluidized-bed firing system, the degree of utilization of the sorbent is considerably increased compared to a simple recycling of filter ash or bottom ash.