GB2261056A

GB2261056A - Boilers

Info

Publication number: GB2261056A
Application number: GB9122181A
Authority: GB
Inventors: Nicholas Julian Jan F Macphail
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-10-18
Filing date: 1991-10-18
Publication date: 1993-05-05
Anticipated expiration: 2011-10-18
Also published as: GB2261056B; GB9122181D0

Abstract

Within a boiler flue path removable guides 4, 5 define laterally displaced passes to reduce the required structural dimensions of the boiler. The passes may include turbulators. <IMAGE>

Description

"Heat Exchangers.

THIS INVENTION relates to heat exchangers: In a typical boiler In which water is to be heated, baffles are commonly fitted to turbulate the flue gases or squeeze plates utilised to keep the flue gases In close proximity to the heat exchanger wall. As disclosed in European Patent Application Number 891141277, removable conductive turbulators may be provided on the inside of a generally tubular water jacket and exposed to the products of combustion of a liquid, solid or gaseous fuel, thus increasing the transfer of heat energy from the products of combustion to the water jacket.

A disadvantage with the above prior art of is that to achieve a commercially acceptable efficiency the physical size of the means of increasing the transfer of heat energy has been comparatively large to accommodate sufficient length of flue pass for the required thermal efficiency thereby leading to large boiler dimensions.

The present invention seeks to provide an improved heat exchanger in which the drawbacks and disadvantages of the prior art are obviated or reduced.

According to the present invention there is provided a removable means of defining the path or paths of the products of combustion causing them to describe a plurality of laterally displaced passes in close proximity to the heat exchanger wall of a heat exchanger as might be used in a boiler.

Preferably the products of combustion traverse a central void between the laterally displaced-passes..

Advantageously the means of defining the path or paths incorporate means of increasing conduction or turbulation or conduction and turbulation as described in European Patent Application 891141277.

Preferably the means of defining the path or paths are in a form to enable its easy insertion and removal through the service access of a boiler.

Conveniently the means of defining the path or paths may be formed from stainless steel. Preferably the means of defining the path or paths includes a portion adapted to substantially seal the path or paths to ensure minimal leakage or short circuiting of the products of conduction to the boiler exhaust.

Advantageously the conductive heat exchanger wall may incorporate projections serving to support and or form seals.

While the present invention is described with two passes in series it should be understood that where boiler configurations dictate more than two passes in series or two or more passes in parallel may be utilised.

To facilitate better understanding of the invention and so its features may be appreciated the invention will now be described by way of example with reference to the accompanying drawings in which: figure I is front elevation view in cross-section through a boiler incorporating the present invention.

Figure 2 is a side elevation view in cross-section through the boiler of Figure 1.

Figure 4-4 is a horizontal sectional view through the boiler of Figure 1 Figure 5-5 is another horizontal sectional view through the boiler of Figure 1.

Figure 5 is a front elevation view in cross-section through a boiler incorporating a further example of the present invention Figure 6 is a side elevation view in cross-section through the boiler of Figure 5.

Figure 7- is a horizontal sectional view through the boiler of Figure 5.

Figure 8-8 is another horizontal sectional view through the boiler of Figure 5.

Figure 9 is a front elevation view in cross-section through a boiler incorporating a further example of the present invention.

Figure 10 is a side elevation view in cross-section through the boiler of Figure 9.

Figure 11-11 is a horizontal sectional view through the boiler of Figure 9.

Figure 12-12 is another horizontal sectional view through the boiler of Figure 9.

Referring firstly to Figure I and 2 of the accompanying drawlngs there is shown a boiler 1. provided with a burner 2. which produces hot gases of combustion within a combustion chamber 3.

The said hot products of combustion are caused to flow close to the boilers heat exchanger wall by a first pass flow plate 4.

Subsequent to the first pass of the said hot gases close to the boilers heat exchanger wall the said hot gases are caused to reverse flow diagonally downwards before describing a further pass close to the heat exchanger wall by second flow plate 5.

The flow plates 4. and 5. may incorporate conductive turbulators as described in European Patent Application 891141277.

Figure 4-4 and 5-5 are sections of Figure 1 showing in Figure 4-4 the first pass against the boilers heat exchanger wall furthest from the burner 2. and in Figure 5-5 the second pass against the boilers heat exchanger wall closest to the burner 2.

Figure 5, 6, 7 - 7 and 8 - 8 shows the boiler of Figure 1 with fiow plates that cause the said hot gases to pass close to two aaJacent waiis of the boilers heat exchanger on the first and subsequent passes.

Figure 9, 10, 11 - 11 and 12 - 12 shows the boiler of Figure 1 with flow plates that cause the said hot gases to pass close to two opposite walls of the boilers heat exchanger on the first and subsequent passes.

The flow plates shown in all the above Figures may be pivoted andior in component form to better facilitate insertion or removal via cleaning accesses.

Claims

I. A removable means of defining the path or paths of the products of combustion causing them to describe a plurality of laterally displaced passes in close proximity to the heat exchanger wall of a heat exchanger as might be used in a boiler.

2. A removable means according to Claim I wherein the products of combustion traverse a central void between the laterally displaced passes.

3. A removable means according to Claim 1 incorporating means of increasing conduction or turbulation or conduction and turbulation as described in European Patent Application 891141277.

removable means according to Claim 1, 2 or 3 wherein the means of defining the path or paths are in a form to enable insertion or removal through a service access.

Amendments to the claims have been filed as follows 1. A removable means of defining the path or paths of the products of combustion causing them to pass at least twice close to a wall of a heat exchanger such that one of the paths fold back at an angle greater than ninety degrees to its preceding pass.
2. A removable means according to Claim 1 wherein the products of combustion traverse a central void between laterally displaced passes.
3. A removable means according to Claim I incorporating means of increasing conduction or turbulation or conduction and turbulation as described in European Patent Application 891141277.
4. A removable means according to Claim 1, 2 or 3 wherein the means of defining the path or paths are in a form to enable insertion or removal through a service access.