FI103365B - The flue gas heater - Google Patents

Description

1 103365

The present invention relates to a radiator-type heat exchanger which recovers fuel, e.g., but not exclusively, the heat contained in the flue gases formed by burning wood, said recovery device being disposed between a furnace and a flue. The device consists of a radial outer casing as well as internal parts inside.

A variety of solutions and devices have been made to recover the heat contained in the flue gases leaving the furnace 10. Good results have been achieved, as in reserving counter-currents. However, due to the variety of heating devices and heating needs, not all heating devices have reached a satisfactory solution. Some of these heaters are fireplace-type heaters with a flue gas temperature of up to 700 degrees Celsius. Efforts have been made to improve the efficiency of some fireplaces by placing draft barriers in the furnace so that the flue gases circulate a longer distance in the furnace and thus release more heat before exiting the flue, but in these solutions with a light smoke chimney on the roof. However, this design has the disadvantage that due to the good thermal conductivity of the metal: -e :: V: 25 and the thinness of the pipe wall, the pipe · .. · condenses the flue gas and condenses the pipe. There are rji / there have been cast iron flue extensions which are: ·; ”· 1 equipped with heat sinks to increase heat transfer but *.: ./ · these have the same carding problem and heat transfer is not '':: T: 30 has not been able to increase much . There are also fully cast iron fireplaces where the whole fireplace is a fireplace and: -:. the bottom of the nest is close to the floor level. These fireplaces have a large, 1V: 1 fuel inlet so that large trees can be burned and V: the firebox can hold a lot of fuel at a time. These combs 35 provide high heating power because of the high radiation surface area.

The drawbacks are the poor heat control and the high price of the fireplaces, which are not widely sold.

It is an object of the present invention to eliminate the drawbacks, the principles of which are set forth above, in the heat recovery of flue gases from fireplace-type heating devices and to provide an acceptable solution to these problems.

According to the invention, this is achieved by the radiator 5-like heat recovery device comprising a tube around which opposing walls have tube-like housings. Said pipe collects the flue gases from the housing and leads them to the top of the pipe and then horizontally extending through the housings extending through the housing from the opposite walls of the pipe, from where the flue gases flow into the housings In the first embodiment, said pipe, comprising an inlet for flue gases, also comprises two rectangular tapered dust openings on opposite walls at the top of the pipe, and said pipe also has a pivotable smoke damper which closes the pipe end and opens 20. The structures described above engage with one another and form the interior of said radiator-like device. Said device also has a radial-shaped outer sheath where the interior portions are located and where the flue gases are discharged from the horizontal housings before returning to the stationary fixed ·. 25, said outer sheath also acts as a heat transfer surface for said device, from where heat is transferred to room air.

• "*»

The invention provides considerable advantages. The radiative heat exchanger of the invention provides a heat transfer of almost min. 50% of the surface area of the min-type heaters and a significant reduction in fuel consumption. Also-:*·!:. Fire safety is also increased because the spark jet leaving the furnace stays in the radiator and does not reach the suspended ceiling. * V: The temperature of the flue gas flowing from the flue gas radiator to the chimney drops significantly after v: 35 chimneys, which reduces the risk of damage to masonry cold smoke chimneys in cabin conditions where:} 'y fireplaces are commonly used as heating : the cooling effect of the materials and the room air warms up to 3 103365 head. The flue gas radiator provides good heat control. The temperature of the radiator can be adjusted by pulling from a few tens of degrees to 280 degrees.

One significant advantage is that the radiator is a separate device from the furnace and can be placed in existing fireplace type heaters.

5

The invention will now be described with reference to the accompanying drawings. Figures 1-2 show the interior of a flue gas radiator. Figures 3-4 show the outer shell of a flue gas radiator.

10 In the first embodiment, figure (2) shows a pipe (1) from which the flue gases enter the radiator. The top of said tube has rectangular tapered apertures. The openings are vertical and on opposite sides of the pipe. The openings are provided with openings in the form of openings (2). Said housings extend horizontally through the walls of the housings (4) from the openings in the form of the housings (2) to the housings (3). (Figs. 3) In said tube (1) above the housings (2) there are also holes transverse to the tube in both walls extending through the holes through the tube shaft. A shaft is provided with a circular direct flow damper (6), the aforementioned housings (4) through which the housings (2) project to engage the pipe (1).

Fig. 4 shows the outer casing of the flue gas radiator, the body of the outer casing being formed by a rigidly-sterilized metal plate (7) to which the back damper (8) is fastened. Said radiator-like outer sheath also comprises an upper. y. ·. 25 and lower end plates (9) with a through hole in the lower plate: * ·. ' to the pipe joint (1) and where the pipe (1) attaches at the lead-through.

• A: A pipe section (10) is secured to the opening in the top end of the damper, whereby the flue gases are discharged from the radiator into the flue. Said rear-view mirror (8): .Γ \. at the bottom on either side has tuhkaJuukkureiät (5). In the figure: -: y; 3 shows the outer jacket of the flue gas radiator with the inner package inside. The outer jacket also comprises in claim 1; * · * .; said housings 3 formed on the outer edges of the outer jacket.

• · · V ·; The invention works as follows * · · ·: y The flue gases from the furnace rise into the flue gas inlet 1 and yj protrude from the discharge openings 2 into the outer peripheral housings 3. The heat of the 1 V pipe heats the air in the inner housings 4. absorbs gases from the housings 3. The negative pressure exerted by the hot flue gases on the tube 1 and the housings 4 4 103365 overrides the flow resistance of the cooled flue gases flowing downwardly in the outer peripheral housings 3. In this way, the flue gas radiator is pulled at an acceleration so good that the draft and subsequent heat 5 that the soot and sludge that had previously entered the radiator will burn off, become ash and fall to the ash hatch. The casing in the center of the battery keeps the cabinet clean. In order to facilitate the starting of the drawing cycle in cold conditions, a direct flow damper 6 is provided at the top of the pipe 1.

10 You can already increase or decrease the heat transfer area of the flue gas printer by changing the length of the radiator vertically. Also, the structure of the outer jacket of the radiator can be modified within certain limits for manufacturing reasons, for example, by making the outer jacket completely by means of a popping technique. Alternatively, the pipe 1 may be extended uniformly through the radiator completely, if openings for the flue gases are made in the upper end of the pipe above the direct flow damper, then said pipe part 10 is not required.

Figure 5 is a schematic top view of a radiator. In Figure 6, arrows 20 indicate the flow of flue gases in the radiator housings.

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Claims (3)

1. Flue gas battery characterized by it consists of an inlet pipe (1) for flue gases, two outlet openings (2), outer housings (3) and inner housings (4). Flue gas battery according to claim 1, characterized in that the outer surfaces of the casings with outlet openings (2) are located inside the inner casings (4). Flue gas battery according to claim 1, characterized in that a straight-flow damper (6) is provided in the upper end of the pipe (1). ,, t I I I | <«« «• · • · · • · · · · · · · · · · · · 1 · · · · · · · · · · · · ** 1 • · · • · A · · · · · · · · · · · · · · · ·