Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
The present invention relates to a tube panel for
heating surface groups. More specifically, the invention
relates to such a tube panel which is particularly suitable
for being used in the gas flue of a heat-exchanger flown through
by highly dust-laden gases. The tube panel comprises~ in ess-
ence, vertical tubes installed between a slightly sloping or
horizontal distrubutor and a collector pipe. The distributor
or collector pipes are connected to a principal distributor
pipe or principal collector pipe, respectively, by way of
elastic connection pipes~ i.e., pipes which are springy and
resilient.
In case of heat-exchangers serving for the utilizat-
ion of gases containing solids, cleaning of the heat-exchanging
surfaces is re~uired during the operation. Beating or shuttle
devices, by means of which the pipe elements of a tube panel
are brought into vibration in order to make the sticky deposits
fall down 7 are frequently used for this purpose. Such apparatus
are efficient only when freedom of movement is provided for the
pipe elements.
For this reason, the known tube panels have pipe
elements consisting of pipes, winded to and fro, which are sus-
pended at their upper9 reversing arc so that their lower ends
may vibrate freely. Exam~les for these types are given in
documents: US-PS 2 183 496, DT-OS 2 036 061, BE-PS 588 672,
DT-GM 7 035 269. Tube panels of these types could be used
either as an overheater, or the medium taking up the heat must
be forced through them. In case of natural or gravitational
circulation of the medium taking up the heat, no pipe elements
that contain sections with a downward flow can be used.
In order that heat-exchangers with natural circulation
could also be used with the utilization of highly dust-laden
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gases, these pipe elements were made of field pipes whose upper
ends were rigidly fixed in collector chambers, while -their
lower end remained movable so that -the field pipes may be
brought into vibration (DT-GM 1 656 591).
However, in heat-exchangers with natural circulation
it is tube panels with possibly straight pipes, connected with
a lower distributor and an upper collector, that are preferably
used since these have various advantages, e.g., in the cir~
culation of the working medium and in production. For example,
a tube panel of this kind is shown in DT-PS 1 231 257. If such
tube panels were to be used in a heat-exchanger whose heating
gases contain solids which would be deposited onto the pipes
in the element, one would be forced to apply other methods --
more expensive than the vibrating -- for cleaning since these
pipe elements are much too rigid to be brought into an efficient
vibration without damaging them.
In case of a tube panel of the type mentioned in the
introductory part (DT-GM 73 42 927), the elastic connection
(springy and resilient) pipes are positioned in the plane of the
tube panels. This position is disadvantageous since, to ensure
a sufficient elasticity, these connection pipes should have a
certain minimum length. If the need in space to fulfill this
requirement is sufficiently high, the additional space remains
unused since this space should be blocked against the gas flow
to force the gases through the pipe elements. A further dis-
advantage of positioning the elastic connection pipes in the
! plane of the tube panels results from the fact that the conn-
ection pipes are attached close to the one end of the tube
panel distribut:or or collector and this makes it difficult to
install cooling pipes into the walls of the gas flue.
The scope and aim of -the present invention is to
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create a tube panel which consists of essentially ver-tical
pipes installed between a slightly sloping or horizontal dis-
tributor and a col.lector, the d:istributor or collector pipes
being connected to a principal distributor or principal collect-
or by means of elastic connection (springy and resilient) pipes,
which element is adapted to be vibrated by means of beating or
vibration device to make the deposits on the vertical pipes
fall down; which element fully utilizes the space required for
the tube panel in the gas flue; and which element does not
complicate or hinder either the construction or the arrangement
of other structural parts.
With respect to the tube panels of this type, the
ojbectives are obtained by bending the connection pipes out of
the plane of the tube panels and by connecting them -- out-
side this plane --.to a principal distributor or a principal
collector, respectively.
In accordanc~ with one emhodiment, a tube panel for
heating surface groups, comprising: vertical tubes of said
panel mounted between a slightly sloping or horizontal dis-
~ 20 tributor pipe and a collector pipe and which is installed inthe gas flue flown-through by gases with particularly high dust
content in a heat exchanger, said distributor or connection
pipes being connected to a principal distr.ibutor and a prin-
~- cipal collector, respectively, by means of elastic connection
pipes, characterized in that said connection pipes are ben~ ~
out of the pla:ne of the vertical tubes and are connected to ~ -
a principal distributor or principal collector respectively, at
a position outside this plane.
` In this manner the stated objectives are obtained,
and a specialist may also see further essential characteristics
and advantages from the following description of the exemplified
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embodiments of the subject of the invention:
Figure 1 is a longitudinal vertical section through
a heat-exchanger (specifically, a steam generator with natural
circulation installed to a garbage incinerator),
Figure 2 is a cross-section along lines II-II of figure
1, i.e., through the gas flue wherein tube panels in the in-
vention are installed,
Figure 3 is the schematic drawing of a known tube
panel (DT-GM 7~ 4~ 927),
Figure 4 is a vertical, longitudinal partial section
through the gas flue of the heat-exchanger in Figure 1 with
tube panel accord;ng to the invention installed in this gas
flue;
Figure 5 is a vertical section along lines V-V through
`~ the gas flue in Figure 4,
Figure 6 is a section along lines VI-VI in Figure 4,
Figure 7 and 8 illustrate ~- similar to Figure 6 --
modifications of the subject of the invention.
In figure 1, the steam-generator has a radiation space
1 which the heating gases, generated in the process of burning
the garbage, enter in the direction of arrow A. The generator
could be equipped with supporting (oil, gas3 combustion means
located in space 2 and it further has a gas flue 3 which
communicates with the radiation space 1. Gases are flown
through the flue in the direction of arrow B~ Overheater sur-
faces 4 are installed in the gas flue 3. Tne overheater sur-
;~ faces 4 consist of pipes winding to and fro, which pipes are
arranged in a way that they can be vibrated in a known manner in
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order to make the deposits on the overheater pipesl which result
; 30 as known from heating-gases of high gas content, fall down.
Steam-generating heating surfaces 5 are installed in the part
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of gas flue 3 at-tached to overheater ~. These surfaces con-
sist of tube panel 6, as seen in figure 7.~
As seen in figures ~ and 5, each of these tube panel
6 is formed of vertical pipes 7, of pipes 8 or 9 serving as
distirbutors or collectors for these pipes, and of connection
pipes 10 or 11 for the principal distributor 12 or principal
collector 13, respectively.
Returning to figure 1, principal distributor 12 ls
connected to longitudinal distributor 12' which is supplied with
water -- via outlet pipe 14 -- from steam condensation drum 15
supplied with a steam/water mixture or steam only, via long-
~ itudinal collector 13' or via over supply or overflow pipes.
; Furthermore, the longitudinal distributors are also connected
with return pipes 16 supplying the water pre-separated in the
upper collector directly, thereby by-passing steam separator
drum 15.
In the case of the tube panel, according to the state
of art (see Figure 3), the elastic (i.e., springy and resilient)
connection pipes (input pipe lOa and output pipe lla) are
located in the plane of vertical pipes 7a and of their distri-
butors 8a and their collectors 9a. A comparison of Figure 3
; with Figure 4 and 5 shows that in the case of an equal distance
between longitudinal distributors 12' or 12a and longitudinal
collectors 13' and 13a, a much smaller heating surface can be
placed in a predetermined space designed according to Figure 3
as compared to those in Figures 4 and 5 (design according to
the invention). Contrarily, in case of design according to
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the invention, free spaces below distributors 8a and above
collectors 9a of the prior art are eliminated, i.e~, the height
of the gas flue could be smaller.
As shown in Figure 4, this is obtained by bending the
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elastic pipes 10, leading to distrihutor 8 of the pipe element,
as well as the elastic pipes 11 leading from the collectors 9
of this element, out of the plane of the vertical pipes of the
tube panel 7 and of the collectors and distributors 8 and 9
associated with them and by connecting them with the principal
distributor 12 and principal collector 13 at a position
outside this plane.
Since elastic connec-tions 10 and 11 can be attached
to distributor 8 and collector 9 at any position, the pipes 17
in the side walls of the gas flue could be connected vertically
to longitudinal distributor 12' or collector 13' which is not
possible in case of design according to Figure 3.
As shown in Figure 5, a beating device 18, which is
: illustrated only schematically and which may be of any known
design, vibrates distributors 8 in order to vibrate pipe
elements.
~ From the side of the working medium, principal dis-
:` tributor 12 and principal collector 13 are connected to long-
itudinal distributors 12' and longitudinal collectors 13' (see
Figures 4 - 6). Since from the side of working medium, there
are several tube panels connected to the same principal dis-
tributor or principal collector, elastic connections 10 or
11 should be of different lengths. As Figures 7 and 8 show, this
condition can be avoided by attaching the lower elastic con-
nections 1 and of course also the non-visible upper connections
~ 11 directly to longitudinal distributors 12' and longitudinal
; collectors 13'. In the exemplifying embodiment in Figure 7,
all tube panels are completely the same whi]e in exemplifying
embodiment in Figure 8, the two types of tube panels have conn-
ections 10 or 11 bent to the links and to the right side. Both
of these exemp:lifying embodiments (figures 7 and 8) give
technological advantages.
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