Method and device for the production of superheated steam
AssigneeEcoenergy Gesellschft fur Energie -Und Umwelttichnik mbH
InventorReinhard Schu
Life of this patent
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Abstract
The invention relates to a method and an apparatus for the generation of superheated steam. According to the invention, essentially saturated or wet steam is generated in a main vessel in which superheating is technically not possible or only restrictedly possible and which is superheated in an auxiliary plant whereby the superheater of the auxiliary plant is controlled dependent upon the steam production of the main plant.
Claims10
A system for making superheated steam, the system comprising:
- a main plant having a drum for making saturated high-pressure steam;
- an auxiliary plant;
- means for transferring the saturated high-pressure steam to an auxiliary plant;
- and
- means in the auxiliary plant for superheating the saturated or wet steam in the auxiliary plant by circulating fluidized-bed combustion or gasification with heat transfer with solid particles of the fluidized bed;
- and
- two fluidized-bed heat exchangers of which one is used for superheating and the other for evaporation including feed water preheating in the case of failure of the main plant, as a start-up boiler and regulating variable.
A method of making superheated steam, the method comprising the steps of sequentially:
- making saturated high-pressure steam in a main plant;
- transferring the saturated high-pressure steam to an auxiliary plant;
- superheating the saturated or wet steam in the auxiliary plant by circulating fluidized-bed combustion or gasification with heat transfer with solid particles of the fluidized bed and by low-pressure heat exchange with flue gas in a waste-heat superheater;
- and
- further cooling the flue gases in the auxiliary plant by an air preheater.
A method of making superheated steam, the method comprising the steps of sequentially:
- making saturated high-pressure steam in a main plant;
- transferring the saturated high-pressure steam to an auxiliary plant;
- superheating the saturated or wet steam in the auxiliary plant by circulating fluidized-bed combustion or gasification with heat transfer with solid particles of the fluidized bed and by low-pressure heat exchange with flue gas in a waste-heat superheater;
- cooling the flue gas to the water dew point by condensate preheating to produce condensate water;
- and
- using the resultant condensate water for flue gas cleaning or as input for feed water treatment.
A method for making superheated steam, the method comprising the steps of sequentially:
- incinerating waste biomass or substitute fuel in a main plant such that heat is released to heat and evaporate water and make saturated high-pressure steam in the main plant;
- transferring the saturated high-pressure steam to an auxiliary plant;
- and
- combusting particles of coal in a fluidized bed in the auxiliary plant to the saturated or wet steam in the auxiliary plant by circulating fluidized-bed combustion or gasification with heat transfer with solid particles of the fluidized bed and by low-pressure heat exchange with flue gas in a waste-heat superheater.
Dependencies are inferred from the claim text.