IES84861Y1 - Improvements to boilers - Google Patents
Improvements to boilersInfo
- Publication number
- IES84861Y1 IES84861Y1 IE2006/0143A IE20060143A IES84861Y1 IE S84861 Y1 IES84861 Y1 IE S84861Y1 IE 2006/0143 A IE2006/0143 A IE 2006/0143A IE 20060143 A IE20060143 A IE 20060143A IE S84861 Y1 IES84861 Y1 IE S84861Y1
- Authority
- IE
- Ireland
- Prior art keywords
- boiler
- condensing
- side walls
- water
- fins
- Prior art date
Links
- 239000000567 combustion gas Substances 0.000 claims abstract description 15
- 239000003546 flue gas Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 210000001503 Joints Anatomy 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 2
- 239000000284 extract Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 240000004317 Spathodea campanulata Species 0.000 description 1
- 235000017899 Spathodea campanulata Nutrition 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Abstract
ABSTRACT The present invention relates to improvements to boilers, in particular boilers used as heat exchangers in heating installations, such as oil fired boilers. The invention also relates to condenser boilers, i.e. oil fired boilers including a condensing unit which extracts additional heat from the combustion or flue gases as they exit an oil fired boiler.
Description
IMPROVEMENTS TO BOILERS
The present invention relates to improvements to boilers, in particular boilers used
as heat exchangers in heating installations, such as oil fired boilers. The invention
also relates to condenser boilers, i.e. oil fired boilers including a condensing unit
which extracts additional heat from the combustion or flue gases as they exit an oil
fired boiler.
In order to increase the efficiency of oil fired boilers, there are numerous boilers on
the market which have increasingly complex internal baffle arrangements and
tortuous passageways for the flue gases to follow. Such baffle arrangements
require regular maintenance in order to keep the passageways clear of soot,
debris and deposits. Also, they require the use of oil-fired burners with high
pressure fans in order to drive the gases through the passageways. There is
therefore a need for a boiler which is easy and inexpensive to manufacture,
provides good heat transfer and does not generate a large back pressure for a fan.
Also, there are many types of condensing boilers on the market. Usually these are
purpose built boilers which include a condensing unit and therefore are quite
expensive. There is a need for a condensing unit which can be added if desired
to a standard boiler during manufacture and can also be retrofitted to existing
boilers to convert them into condensing boilers
The present invention provides a boiler for a fan assisted burner, the boiler being
of generally rectangular construction having a base, a top plate, four sidewalls
extending between the base and the top plate, one or more of the side walls being
of hollow construction so as to act as heat exchangers for water flowing through
the hollow side walls, a plurality of fins being fixed to the inner surfaces of the side
walls, one or more transverse baffle plates engaged with the fins, spacer means
being provided between the baffle plates and the fins so as to generate an
elongate gap between the baffle plates and the two opposing side walls and the
rearmost side wall, whereby combustion and flue gases emanating from the
combustion chamber extend through said elongate gaps between the fins, baffle
plates and side walls to provide heat transfer from the combustion and flue gases
to the water passageways.
Ideally, the fins are welded to the side walls of the boiler so as to provide for good
thermal transfer.
The present invention also provides a condensing apparatus for fitting to a water
heating boiler having a fan assisted fuel burner, an inlet and an outlet for the
passage of water through heat exchanger passageways for the transfer of heat to
the water, an exhaust flue port at the upper end of the boiler for conveying exhaust
flue gases to an outside atmosphere through a flue pipe, the condensing
apparatus comprising a first manifold for fitting to the exhaust flue port of the
boiler, a second manifold for fitting to an end of the flue pipe and a compact
condensing heat exchanger clampable between the first and second manifolds,
whereby the condensing heat exchanger is adapted to extract additional heat from
the exhaust flue gases and transfer the additional heat to the water of a heating
system.
Advantageously, the condensing heat exchanger is removably mountable on the
boiler by the use of swivel joints for connection of the apparatus to the water
supply system. In this way the condensing heat exchanger can be readily
removed for cleaning and maintenance.
The invention will hereinafter be more particularly described with reference to the
accompanying drawings which show, by way of example only, one embodiment of
a boiler according to the invention and one embodiment of a condensing
apparatus according to the invention. In the drawings:
Figure 1 is a perspective view from the front and one side of the boiler; and
illustrating the passage of combustion gases at one side of the boiler;
Figure 1A is a second perspective view from the front of the boiler;
Figure 2 is a front view of the boiler illustrating the passage of combustion
gases at two sides of the boiler;
Figure 3 is a perspective view of four baffle plates used in the boiler;
Figure 4 is a front view of the four baffle plates;
Figure 5 is an exploded perspective view from one side of the main
components of the condensing apparatus for mounting on the boiler; and
Figure 6 is an exploded perspective view from another side of the main
components of the condensing apparatus.
Referring to the drawings, the boiler 10 comprises a left hand side wall 12, a rear
side wall 14 and a right hand side wall 16 and an access door (not shown for
clarity purposes). The side walls 12. 14 and 16 include hollow passageways for
conducting water for a heating system. The boiler also includes a base 20 and a
top plate 22 which has an outlet port 24 for combustion gases. Lower front wall
26 is provided with an orifice 28 for mounting a fan assisted oil fired burner (not
shown) which fires into combustion chamber 30 at the lower portion of the boiler
Located above the combustion chamber is a series of baffle plates 40, 41, 42 and
43 whose function is to impede the passage of combustion and flue gases from
the combustion chamber 30. Each of the baffle plates is supported on fins 50
transversely extending into the boiler region. Each of the fins 50 is an elongate
strip of metal welded to the inner surface 18 of the boiler so as to achieve good
thermal transfer. In this particular embodiment the fins are 5mm thick steel plates
and 30mm wide but these dimensions can be varied.
The bottom baffle plate 40 has a V shaped formation 45 which is used to deflect
the fire ball produced by the burner. In this embodiment it is 5mm thick and the
upper baffles 41, 42, 43 are manufactured from 3mm thick steel plates. A slot 46
is formed at each side of the baffle plate 40 so that the flue gases can escape at
the sides of the baffle plate 40 adjacent the side walls 12 and 16 of the boiler
Each of the baffles plates 41, 42 and 43 is
provided with four support legs 60, one at each corner and a spacing tab 62 at the
back of each plate. When installed, the legs 60 stand on the respective fins 50
thereby giving good heat transfer.
thus creating a gap at the side of each baffle plate so that the combustion gases
can travel around each fin 50. The passage of the combustion gases is indicated
by the flow paths A and B as shown in Figure 2. Flue gases also flow at the back
of the baffle plates 41, 42 and 43. The passage of flue gases is then kept close to
the inner walls of the sidewalls of the boiler and assists in the heat transfer. In this
embodiment, the legs 60 are 15mm high and the gap from the legs 60 to the inner
surface 18 of the side walls is approximately 12mm. These dimensions may of
course be varied to suit requirements as can the vertical distance between each
fin which in the current embodiment is 40mm.
In the operation of the boiler, the combustion gases travel upwards. The gases
firstly come in contact with the lower baffle 40 and divert outwards in three
directions to the left, rear and right to contact the vertical water filled surfaces of
the sidewalls. In order for the gases to travel upwards, they must come in contact
with the fins 60 and are then diverted inwards into open space below the baffle
plates. To exit from this area, the gases escape between the gap formed at the
sides of each baffle plate and scrub off the fins 60 and so on until the gases finally
leave the boiler.
The continuous vertical movement of the combustion gases reduces the
combustion pressure in the boiler, thus requiring a lower pressure fan of
approximately 1.2 MBars instead of a 3MBars fan which is in common usage.
The condensing apparatus 100 shown in Figures 5 and 6, is fitted to the top of the
The
condensing apparatus 100 comprises three main components, a first manifold
boiler 10 if it is required to convert the boiler into a condensing boiler.
, a compact condensing heat exchanger 120 and a second manifold 130. The
first manifold 110 is seated over the flue outlet port so that the combustion gases
are directed out of the first manifold 110, into the heat exchanger 120 and onto the
second manifold 130. Included in the second manifold 130 is an outlet port 132 to
which the flue pipe (not shown) is connected. Separate gaskets (not shown) are
provided between the manifolds 110 and 130 and the heat exchanger 120. The
entire assembly is clamped together by elongate bolts (not shown) which extend
between the holes 112 in the first manifold 110 and the holes 134 in the second
manifold 130. The water inlet and outlet for the condensing heat exchanger 120 is
provided through the inlet and outlet pipes 122 and 124. These are connected into
the water heating system using swivel joints (not shown) which are used to readily
connect and disconnect a circulating pump into the system. In this way, the heat
exchanger can be readily removed for cleaning and maintenance by undoing the
manifold clamping screws and the swivel joints. Although the pipes 122 and 124
are shown extending from the upper surface of the heat exchanger 120, they can
also extend from the sides. The heat exchanger as shown is a plate heat
exchanger but any other known compact heat exchanger can be used. The
manifolds 110 and 130 and the heat exchanger 120 are all manufactured from
stainless steel.
The condensing apparatus 100 can be fitted to the boiler 10 if required. Also it
can be retrofitted to existing boilers in situ. Different shaped manifolds 110 and
130 would be required depending on the configuration of the boiler type being
converted to function as a condensing boiler.
It will of course be understood that the present invention is not limited to the
specific details herein described, which are given by way of example only, and that
various alterations and modifications may be made without departing from the
scope of the invention.
MACLACHLAN & DONALDSON
Applicant's Agents,
Merrion Square,
Dublin 2.
Claims (5)
1. A condensing apparatus for fitting to a water heating boiler having a fan assisted fuel burner, an inlet and an outlet for the passage of water through heat exchanger passageways for the transfer of heat to the water, an exhaust flue port at the upper end of the boiler for conveying exhaust flue gases to an outside atmosphere through a flue pipe, the condensing apparatus comprising a first manifold for fitting to the exhaust flue port of the boiler, a second manifold for fitting to an end of the flue pipe and a compact condensing heat exchanger clampable between the first and second manifolds, whereby the condensing heat exchanger is adapted to extract additional heat from the exhaust flue gases and transfer the additional heat to the water of a heating system.
2. A condensing apparatus as claimed in Claim 1 in which the condensing heat exchanger is removably mountable on the boiler by the use of swivel joints for connection of the apparatus to the water supply system, whereby the condensing heat exchanger can be readily removed for cleaning and maintenance.
3. A condensing apparatus as claimed in Claim 1 or Claim 2 fitted to a boiler for use with a fan assisted burner, the boiler being of generally rectangular construction having a base, a top plate, four sidewalls extending between the base and the top plate, one or more of the side walls being of hollow construction so as to act as heat exchangers for water flowing through the hollow side walls, a plurality of fins being fixed to the inner surfaces of the side walls, one or more transverse baffle plates engaged with the fins, spacer means being provided between the baffle plates and the fins so as to generate an elongate gap between the baffle plates and the two opposing side walls and the rearmost side wall, whereby combustion and flue gases emanating from the combustion chamber extend through said elongate gaps between the fins, baffle plates and side walls to provide heat transfer from the combustion and flue gases to the water passageways.
4. A condensing apparatus fitted to a boiler as claimed in Claim 3 in which the fins are welded to the side walls of the boiler so as to provide for good thermal transfer.
5. A condensing apparatus fitted to a boiler substantially as herein described with reference to and as shown in the accompanying drawings.
Publications (1)
Publication Number | Publication Date |
---|---|
IES84861Y1 true IES84861Y1 (en) | 2008-04-16 |
Family
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