Process and apparatus for ducting flue gas within a boiler
AssigneePPT Pyrolyse-und Prozessanlagentechnik GmbH & Co.
InventorWilfried Boder
Life of this patent
Estimating the term…
Abstract
In the boiler plant the flue gases coming from the firing space undergo division into at least two part-currents which are cooled to different degrees by giving up heat to a heat exchange medium and are then mixed together partly for producing a gas current with a desired temperature dependent on the rates of mixing of the two part-currents. The mixed current is then taken up by a heat user. Parts of the flue gases not going to the heat user are run through all heat absorbers of the system as far as the off-gas stack. The amounts of the part-currents of flue gases, used for forming the gas current with the desired temperature of mixing, are controlled dependent on the mixing temperature.
Claims29
A process for ducting flue gases produced in the firing space of a boiler, said boiler being of the type in which the flue gases within the boilder give up heat by being passed through heat absorbers, themselves cooled by heat transport fluid, and run ultimately to an off-gas stack, said process comprising the steps of:
- dividing at least a portion of the flue gases coming from the firing space into at least two part-currents,
- cooling the separate part-currents to different degrees by having them give up heat to the transport fluid,
- mixing at least a portion of the part-currents together again to form a mixed gas current whose temperature, following mixing, is controlled by selecting the proportions of the part-currents in said mixed gas current;
- running at least part of the mixed gas current to an external flue gas user.
- the undivided portion of the flue gases and the portion of the mixed gas current not going to the user being run as far as through the last heat absorber to the off-gas stack.
Apparatus for ducting or routing flue gases produced in the firing space of a boiler, said boiler being of the type in which the flue gases within the boiler give up heat by being passed through heat absorbers cooled by a heat transport fluid, said flue gases being ultimately provided to an off-gas stack, said apparatus comprising:
- means for dividing at least a portion of the flue gases from said firing space into at least two part-currents;
- means including at least one heat absorber for cooling the separate part-currents to different degrees;
- means for mixing at least a portion of the part-currents together again to form a mixed gas current, said mixing means including means for controlling the temperature of said mixed gas current by selecting the proportions of the separate part-currents included therein;
- means for providing at least a portion of said mixed gas current to an external glue gas user;
- and
- means for running the undivided portion of the flue gases and the portion of the mixed gas current not going to the user as far as through the last of said heat absorbers to said off-gas stack.
Dependencies are inferred from the claim text.