GB2422893A

GB2422893A - A boiler with baffle plate assembly

Info

Publication number: GB2422893A
Application number: GB0600899A
Authority: GB
Inventors: Stephen William John Grant
Original assignee: Alley Enterprises Ltd
Current assignee: Alley Enterprises Ltd
Priority date: 2006-01-17
Filing date: 2006-01-17
Publication date: 2006-08-09
Anticipated expiration: 2026-01-17
Also published as: GB2422893B; GB0600899D0

Abstract

An enclosed boiler 1 comprises a rectangular heat exchange combustion chamber 2 having a base wall 3, a top wall 4 and upstanding side walls 5, at least a portion of which side walls 5 are hollow for containing and circulating system water in a conventional manner. Mounted within the enclosure 2 are a plurality of heat transferring baffle plate assemblies 8, 9,10,11 each comprising a baffle base plate 12,13,14,15 and an upstanding deflector baffle plate 16,17,18 which together form a combustion chamber extension cavity 24 within the enclosure 2 which extends upwards from a main combustion chamber 22. The provision of such a combustion chamber extension cavity 24 provides additional capacity within the enclosure 2 for the full development of the burner flame to aid increased combustion within the boiler 1.

Description

"A boiler" Thtroduction The present invention relates to a boiler and in

particular to an enclosed boiler, such as an oil fired boiler.

There are many constructions of such boilers and the present invention is specifically directed to improvements in the invention of European Patent No. EP 0 616 676B, the disclosure of which is included herein in it's entirety by way of reference. This is a very efficient construction of enclosed boiler. However, since this invention was devised there have been developments directed to improving the combustion of gases within the combustion chamber of this boiler.

With boilers of this type flame and gases are delivered from an oil burner into a combustion chamber within which they are burned. However, with present boiler configurations there is often incomplete combustion of fuels within the combustion chamber due to the incomplete formation of the flames produced by the burner. This is problematic as it reduces the efficiency of the combustion process, which in turn reduces the fuel efficiency of the boiler. Furthermore, the incomplete combustion of gases within the combustion chamber will also cause quantities of unburned dangerous combustibles to be emitted from the boiler which is particularly dangerous as these gases, which will typically include carbon monoxide, are often highly explosive and poisonous. Moreover, the damage caused to the environment by such gas emissions is also significant, and with ever more stringent laws evolving the increased costs associated with environmental compliance are now being passed onto gas producers.

To increase gas combustion within boiler combustion chambers it is known to increase the capacity of the combustion chamber. For example, French Patent No. 71.09084 (to Perinelle) describes a boiler enclosure mounting a cylindrical pot which has an open end facing a fuel burner and has disposed on its external wall a plurality of fins or baffles. The provision of such an open cylindrical pot within the boiler enclosure provides an açkJitiqnal qpj,acity withLn enclosure which enables the flame produced by the fuel burner to fully develop and therefore go some way towards completely burning the fuel supplied thereto. This prior art configuration for a boiler is however difficult to maintain and is not optimally fuel efficient.

It is a therefore one object of the present invention to provide an improved construction of boiler of the aforesaid type which goes someway toward overcoming at least the above problems, and/or which will provide the public and/or industry with a useful choice. It is a further object of the present invention is to provide an improved boiler based on the principles of the boiler described in the aforementioned European Patent No. 0616676B.

It S acknowledged that the term comprise' may, under varying jurisdictions be provided with either an exclusive or inclusive meaning. For the purpose of this specification, and unless otherwise noted explicitly, the term comprise shall have an inclusive meaning - i.e. that it may be taken to mean an inclusion of not only the listed components it directly references, but also other non-specified components.

Accordingly, the term comprise' is to be attributed with as broader interpretation as possible within any given jurisdiction and this rationale should also be used when the terms comprised' and/or comprising' are used.

Further aspects of the present invention will become apparent form the ensuing

description which is given by way of example only.

Statements of Invention

According to the invention, there is provided an enclosed boiler comprising: a substantially rectangular heat exchange combustion enclosure formed by a base wall, upstanding side walls on the base and a top wall, at least a portion of which walls are hollow for containing system water, a gas inlet located adjacent the base wall and a gas discharge outlet located adjacent the top wall, * * *** * S..

* S I * * S * * S * * * . S S S. S I * S * S S S *5 5 5 * S I. * * S I a plurality of heat transferring baffle plate assemblies, each stacked one above the other within the enclosure and comprising a substantially rectangular baffle base plate which is configured to fit relatively snugly transversely across the enclosure, which baffle base plate is also one of a lower baffle base plate, an intermediate baffle base plate and an upper baffle base plate, the lower baffle base plate and intermediate baffle base plates each having upstanding thereon an endless deflector baffle plate having an outer facing peripheral wall and an inner facing peripheral wall, wherein the base wall forms, with the upstanding side walls below the lower baffle base plate, a combustion chamber, and the lower baffle base plate and intermediate baffle base plates each have a central hole which, with the inner facing peripheral wall of the deflector baffle plates on the lower baffle base plate and intermediate baffle base plates, form a combustion chamber extension cavity, which combustion chamber extension cavity extends upwards from the combustion chamber between those inner facing peripheral walls to the underside of the upper baffle base plate, and wherein each base plate also comprises a corner cut-out portion adjacent one corner forming one of a base plate inlet and outlet so that the outer facing peripheral walls of deflector baffle plates and the base plates of each heat transferring baffle plate assembly, and the underside of the base plate of the heat transferring baffle plate assembly stacked on it form, with the side walls of the enclosure, a passageway for leading combustion gases from the base plate gas inlet formed in the lower baffle base plate and then back and forth across the enclosure and out of the gas discharge outlet.

The provision of a combustion cavity in communication with the combustion chamber provides additional capacity within the boiler so that the flames produced by the burner will be able to fully develop, which will in turn facilitate greater fuel combustion than hereto before. Furti-ermore;u a boiler wilL jso provide an increase in heat transfer efficiency. This is because the hot gases produced will be giving up a high proportion of their heat against the inward facing peripheral walls of the deflector baffle plates whilst still Occupying the combustion cavity, which deflector baffle plates, it will be appreciated, are in contact with the base plates, which are themselves in contact with the side walls of the boiler. Such overall heat transfer is not alone more efficient, but will have the effect of reducing distortion of the baffle plate assemblies.

In one embodiment of the invention, the inward facing peripheral walls of the deflector baffle plates and the underside of the upper baffle base plate are together arranged to turn the gases through between 1800 and 360 when in the combustion chamber extension cavity, which turning causes the gases to evacuate the combustion chamber extension cavity via the combustion chamber and through the base plate gas inlet formed on the lower baffle base plate.

Turning the gases in this way will cause the gases to lick the inward facing peripheral walls of the deflector baffle plates, which will further aid heat transfer efficiency of the boiler.

In another embodiment of the invention, each heat transferring baffle plate assembly is separately removable from within the boiler enclosure.

Such an arrangement will enable the boiler to be easily accessed so that each baffle plate assembly in the stack of assemblies can be removed for cleaning.

In one embodiment of the invention, the endless deflector baffle plates upstanding on each of the lower baffle base plate and intermediate baffle base plates comprise: a pair of side deflector baffle plates each substantially parallel with and spaced apart from a side wall of the boiler, which side deflector baffle plates are integrally fixed to, a front substantially V-shaped deflector baffle plate having an open mouth forming an inner wall of the combustion chamber extension cavity and an apex which abuts a pprtio, t the front aU f the boiler to follow the contour -5- - of the corner cut-outs in the base plates to direct gases into and out of the passageway formed by the stacked baffle plate assemblies, and a rear deflector baffle plate substantially parallel with and spaced apart from the rear wall of the boiler.

The advantage of such a configuration of baffle plates is that they provide a better support for stacking one on top of another and also each other and there is less warping of the baffle plate assemblies in use.

In one embodiment of the invention, there is upstanding on the upper baffle base plate a single deflector baffle plate which is substantially parallel with and spaced apart from a side wall of the boiler substantially near the corner cut-out in the upper baffle base plate.

Preferably, hot gases and flame are delivered to the boiler through the gas inlet.

In one embodiment of the invention, the boiler is down fired, the gas inlet being provided adjacent the top wall and the gas discharge outlet being provided adjacent the base wall.

Detailed Description of the Invention

The invention will be more clearly understood from the following description of some embodiments thereof, given by way of example only, with reference to the accompanying drawings, in which: Fig. 1 is a perspective partially cut-away view of a boiler according to the invention, Fig. 2 is a sectional view of the boiler shown in Fig. 1, Fig. 3 is an exploded view of a number of baffle plate assemblies, and Fig. 4 is a PersPeptive1view*o the baffle pjt,e assemblies shown in Fig. 3 stacked on top of one another; Referring to the drawings, and initially to Fig. 1 thereof, there is illustrated an enclosed boiler, indicated generally by the reference numeral 1. The boiler 1 comprises a substantially rectangular heat exchange combustion chamber, indicated generally by the reference numeral 2, having a base wall 3, a top wall 4 and upstanding side walls 5, at least a portion of which side walls 5 are hollow for containing system water which is circulated through the side walls 5 in conventional manner. Also shown is a gas inlet 6 located substantially adjacent the base wall 3 for delivering hot gases and flame to the boiler 1, and a gas outlet 7 located adjacent the top wall 4 through which exhaust gases leave the boiler 1.

Mounted within the enclosure are a plurality of heat transferring baffle plate assemblies, indicated generally by the reference numerals 8, 9, 10 and 11. It will be noted that the heat transferring baffle plate assemblies 8, 9, 10 and 11 are stacked one on top of the other (as shown in Fig. 4) within the enclosure 2. In the instance shown, the baffle plate assembly 8 comprises a lower baffle base plate 12, the baffle plate assemblies 9 and 10 each respectively comprise an intermediate baffle base plate 13 and 14, and the baffle plate assembly 11 comprises an upper baffle base plate 15. The lower baffle base plate 12 and intermediate baffle base plates 13 and 14 each have mounted thereon an upstanding endless deflector baffle plate 16, 17 and 18, which deflector baffle plates have an outer facing peripheral side wall 20 and an inner facing peripheral side wall 21 (see Fig. 3). The upper baffle base plate 15 has upstanding thereon a single deflector baffle plate 19 which is substantially rectangular and parallel with and spaced apart from a side wall 5 of the boiler enclosure 2. It is optimally located near a corner of the upper baffle base plate 15.

It should also be appreciated that each base plate 12, 13, 14 and 15 is substantially rectangular and is configured to fit relatively snugly transversely across the enclosure 2 between the side walls 5. The lower baffle base plate 12 may, for example, be mounted on inwardly directed lugs or support plates extending from the side walls 5.

Referring now to Fig. 2, with parts similar to those described with reference to Fig. 1 above also identified by tlip sapie rejçence nurreraj there is shown the base wall 3 which forms, with the upstanding side waIls 5 below the lower baffle base plate 12, a combustion chamber 22.

With specific reference to Fig. 3, again with parts similar to those already described identified by the same reference numerals, the lower baffle base plate 12 and the intermediate baffle base plates 13 and 14 each have a central hole 23, which form, with the inner facing peripheral walls 21 of the deflector baffle plates 16, 17 and 18, a combustion chamber extension cavity 24 (see Fig. 2). It should be understood that the extension cavity 24 extends upwards from the combustion chamber 22 between the inner facing peripheral walls 21 of the deflector baffle plates 16, 17 and 18 to the underside 25 of the upper baffle base plate 15. Such an extension cavity 24 provides additional capacity within the boiler enclosure 2 to facilitate the full development of combustion flames which enter the combustion chamber 22 through the gas inlet 6 to therefore provides better combustion of combustibles within the enclosure 2.

Each baffle base plate 12, 13, 14 and 15 further comprises a corner cutout portion 26 (see Fig. 3) which forms one of a base plate gas inlet and a base plate gas outlet.

The inner facing peripheral walls 21 of the deflector baffle plates 16, 17 and 18 and the underside 25 of the upper baffle base plate 15 are together arranged to turn the gases through between 180 and 360 when in the combustion chamber extension cavity 24. Such turning will facilitate the evacuation of exhaust gases from the extension cavity 24 via the combustion chamber 22 and out of the corner cut-out portion 26 in the lower baffle base plate 12. The direction of such gas flow through the boiler 1 is indicated in Fig. 2 by the directional arrows shown.

As the position of the heat transferring baffle plate assemblies 8, 9, 10 and 11 within the boiler 1, as well as the location of the corner cut-out portions 26 in the baffle base plates 12, 13, 14 and 15 are generally the same as that described in European Patent No. 0616676B they will not therefore be further described herein. The only exception to this is in the uppermost heat transferring baffle plate assembly 11, which, as already described, comprises only a single upstanding deflector baffle plate 19 on the upper baffle base plate 15.

Accordingly, and as shown n Fins. 1 pd 2, the oyter.fpcing peripheral walls 20 of the deflector baffle plates 16, 17 18, and 19 and the baffle base plates 12, 13, 14 and 15 form, with the underside of the base plate stacked on it and the side walls 5 of the enclosure 2, a passageway for leading combustion gases from the corner cut-out portion 26 formed in the lower baffle base plate 12 and then back and forth across the enclosure 2 and out of the gas outlet 7.

In operation, as can be seen from Figs. 1 and 2, the combustion gases initially pass under pressure from the combustion chamber extension cavity 24 down to the combustion chamber 22 and then rise through the cut- out portion 26 in the lower baffle base plate 12 and then move along the side wall 5 of the boiler in a clockwise direction around the deflector baffle plate 16. The gases then rise up the cut-out portion 26 formed in the intermediate baffle base plate 13 and then move along the side wall 5 of the boiler in a counter-clockwise direction around the deflector baffle plate 17 and on up through the cut-out portion in the intermediate baffle base plate 14. This movement of gases through the passageway formed continues until the gases emerge through the cut-out portion 26 in the upper baffle base plate 15, which gases are then delivered out of the boiler through the gas outlet 7 which will generally be connected to a standard boiler gas exhaust flue, It should appreciate that the number of passes made by the gases may be increased by simply providing additional heat transferring baffle plate assemblies.

Each heat transferring baffle plate assembly 8, 9, 10 and 11 is separately removable from within the boiler enclosure 2 so the boiler 1 may be cleaned.

The invention is not limited to the embodiment hereinbefore described, but may be varied in both construction and detail within the scope of the claims.

* I *IS * *** * 4 S * I * * * I S a S I $ S I S I I I * I * S II I S I S IS I 5 5 S

Claims

An enclosed boiler comprising: a substantially rectangular heat exchange combustion enclosure formed by a base wall, upstanding side walls on the base and a top wall, at least a portion of which walls are hollow for containing system water, a gas inlet located adjacent the base wall and a gas discharge outlet located adjacent the top wall, a plurality of heat transferring baffle plate assemblies, each stacked one above the other within the enclosure and comprising a substantially rectangular baffle base plate which is configured to fit relatively snugly transversely across the enclosure, which baffle base plate is also one of a lower baffle base plate, an intermediate baffle base plate and an upper baffle base plate, the lower baffle base plate and intermediate baffle base plates each having upstanding thereon an endless deflector baffle plate having an outer facing peripheral wall and an inner facing peripheral wall, wherein the base wall forms, with the upstanding side walls below the lower baffle base plate, a combustion chamber, and the lower baffle base plate and intermediate baffle base plates each have a central hole which, with the inner facing peripheral wall of the deflector baffle plates on the lower baffle base plate and intermediate baffle base plates, form a combustion chamber extension cavity, which combustion chamber extension cavity extends upwards from the combustion chamber between those inner facing peripheral walls to the underside of the upper baffle base plate, and wherein each base plate also comprises a corner cut-out portion adjacent one corner forming one of a base plate inlet and outlet so that * I *as * I..

* * S S S S I * I S S I I S I I. * S I I I S * S S *5 S I I I a. * * * the outer facing peripheral walls of deflector baffle plates and the base plates of each heat transferring baffle plate assembly, and the underside of the base plate of the heat transferring baffle plate assembly stacked on it form, with the side walls of the enclosure, a passageway for leading combustion gases from the base plate gas inlet formed in the lower baffle base plate and then back and forth across the enclosure and out of the gas discharge outlet.
2. An enclosed boiler as claimed in claim 1, in which the inward facing peripheral walls of the deflector baffle plates and the underside of the upper baffle base plate are together arranged to turn the gases through between 180 and 360 when in the combustion chamber extension cavity, which turning causes the gases to evacuate the combustion chamber extension cavity via the combustion chamber and through the base plate gas inlet formed on the lower baffle base plate.
3. An enclosed boiler as claimed in claims 1 or 2, in which each heat transfemng baffle plate assembly is separately removable from within the boiler enclosure.
4. An enclosed boiler as claimed in any preceding claim, in which the deflector baffle plates upstanding on each of the lower baffle base plate and intermediate baffle base plates comprise: a pair of side deflector baffle plates each substantially parallel with and spaced apart from a side wall of the boiler which side deflector baffle plates are integrally fixed to, a front substantially V-shaped deflector baffle plate having an open mouth forming an inner wall of the combustion chamber extension cavity and an apex which abuts a portion of the front wall of the boiler to follow the contour of the corner cut-outs in the base plates to direct gases into and out of the passageway formed by the stacked baffle plate assemblies, and * * *a* S *SS * S S S S S S * S I I I S S S IS I I I I 5 * S S 55 5 5 5 S I. I * S S a rear deflector baffle plate substantially parallel with and spaced apart from the rear wall of the boiler.
5. An enclosed boiler as claimed in any preceding claim, in which there is upstanding on the upper baffle base plate a single deflector baffle plate which is substantially parallel with and spaced apart from a side wall of the boiler substantially near the corner cut-out in the upper baffle base plate.
6. An enclosed boiler as claimed in any preceding claim, in which hot gases and flame are delivered to the boiler through the gas inlet.
7. An enclosed boiler as claimed in any preceding claim, in which, the boiler is down fired, the gas inlet being provided adjacent the top wall and the gas discharge outlet being provided adjacent the base wall.
8. A boiler substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

* * U.. S ala * . I a S S S * S I S S a S * *. * a a S S S * U a *S S S