Liquid heaters and vaporizers – Plants – Feed water heaters
Patent
1992-09-05
1994-07-05
Favors, Edward G.
Liquid heaters and vaporizers
Plants
Feed water heaters
622386, 165 2, 237 2B, F22B 3300
Patent
active
053258215
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for utilizing effectively the high energy values of fossile fuels in closed boiler systems, with the aid of a processor which includes an air heat pump and a heat exchanger in which air is cooled for cooling the flue gases generated in the boiler system, said heat exchange taking place between two circulating air flows through the heat exchanger. The invention also relates to an arrangement for carrying out the method.
Such arrangements are known from the Swedish Patent Specifications 7909528 and 8306259-6, and also from Swedish Patent Application 8300609-8.
The main object of the invention is to improve the operation of arrangements of this kind, particularly with regard to ensuring that the flue gases will always exit from the boiler system, even in the event of a heat-exchanger malfunction or some similar malfunction.
A further object of the invention is to improve the boiler system so that the energy values of the fuel used can be utilized effectively.
These and other objects of the invention are achieved by means of the inventive method and arrangement having the characteristic features set forth in the following Claims.
The invention will now be described in more detail with reference to the accompanying drawings, in which
FIG. 1 is a schematic, cross-sectional view of the inventive boiler system;
FIG. 2 is a cross-sectional view of a condensation trap or collector included in said system; and
FIG. 3 is a sectional view, similar to the view of FIG. 1, of a modified embodiment of the system.
The system illustrated in FIG. 1 includes an oil or gas burner 1 mounted in a boiler 2. The boiler 2 is connected to a condensation trap K by means of a channel 3, as described in more detail herebelow, said condensation trap K being connected upstream of a heat exchanger 4. Connected to the channel 3 is a shunt channel 11 which extends to an exhaust pipe or smoke stack 9 through which exhaust air or flue gas/air mixture exits from the system. The system includes a shut-off valve V.sub.1, V.sub.2 and V.sub.3 by means of which the flue gases or flue gas/air mixture can be selectively passed through the channel 3 to the condensation trap K, or through the channel 11 to the flue stack 9, this latter case being applicable, for instance, when carrying out maintenance or repair on the processor components, such as on the heat-pump or heat exchanger.
Arranged above the heat exchanger 4 is a suction chamber 6, which is equipped with a fan 7 connected to a suction pipe 9. The system also includes an air heat pump 5 which is spaced from the heat exchanger 4. Arranged in this space is a fan 10 to which a fresh-air intake channel 12 is connected. A condensation line 13 extends from the condensation trap K to a neutralising vessel 14. The entire system is incorporated in a closed boiler room, from which only the air inlet, air outlet and flue stack will normally communicate with the ambient atmosphere.
The system illustrated in FIG. 1 operates in the following manner: As shown in broken lines, the system includes a first circulation path C.sub.1 around which boiler-room air circulates, said air being drawn into the heat pump 5 by the fan 10, which forces the air into the heat exchanger, optionally through the admixture of fresh air, as indicated by the double-dot-dash line in the pipe 12, when the burner 1 is in operation, as described below. The admixture of fresh air has thus two functions; because hydrogen gas is generated during the combustion process, the amount of condensation formed can be increased threefold by introducing fresh air and by cooling of the flue gases to the low temperature; and because the amount of condensation is increased, the extraction of sulphur contaminants from the flue gases is improved, i.e. the condensation will be less corrosive and therefore cause less corrosion damage to equipment. The air passes from the heat exchanger 4 back to the boiler room. When the boiler 1 is functioning, a subpressure is generated in the boiler room, therewith causing fresh
REFERENCES:
patent: 4178988 (1979-12-01), Cann et al.
patent: 4687133 (1987-08-01), Karlstedt
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