WO2018166587A1

WO2018166587A1 - Grate bar, grate, and combustion system

Info

Publication number: WO2018166587A1
Application number: PCT/EP2017/056054
Authority: WO
Inventors: Theodor Koch
Original assignee: Seko-Patent Gmbh
Priority date: 2017-03-15
Filing date: 2017-03-15
Publication date: 2018-09-20
Also published as: EP3596390A1

Abstract

The invention relates to a grate bar (100) for combustion systems, comprising a substantially closed surface facing the combustion side, a rear support region which is designed to be supported on a grate support, a front nose region which runs between the surface and the front edge and which comprises a support region formed on the lower face, and a grate cooling tube system (102) which is integrated in the grate bar (100) for conducting a cooling liquid, wherein the grate cooling tube system (102) has an inlet distributor (104) for supplying the cooling liquid, an outlet collector (114) for discharging the cooling liquid, and multiple cooling tubes (108', 108", 112', 112"), each of which is individually connected to the inlet distributor (104) and the outlet collector (114) in a fluid-tight manner.

Description

Grate, rust and incinerator

The present invention relates to a grate bar, a grate and an incinerator.

For the combustion of different fuels, e.g. Household waste, industrial waste, wood waste, solid or porous fuels, as well as fuels with high and low ignition, come conventionally

Combustion systems with combustion chambers for use, in which the fuel is applied, for example, to a mechanically operated grate and burned on it. Combustion plants are generally processed combustion material with high and low calorific value, so that in the grate elements used large heat-related problems can occur. Especially in Rostköpfbereich the

Grate elements may burn or corrode due to excessive thermal stress.

In order to solve the heat-related problems, grate bars are known, which are cooled by means of cooling water, wherein the cooling water is passed through a grate bar cast in a 1-strand cooling coil of a cooling pipe system. The cooling water enters the cooling pipe system and is redirected in the cooling coil via deflections, turns and / or bends until it exits several times in the grate bar body. There are several juxtaposed grate bars of a grate with each other via connecting lines connected. Thus, the cooling water dissipates the heat from the grate, whereby it is cooled.

A disadvantage is that due to the overall long way and by the deflections, turns and / or bends to the outlet, a high pressure loss arises. This pressure loss is due to the interconnection of several

Rost bars next to each other additionally reinforced. in the

Conversely, a high pressure must be built to the cooling water with sufficient for cooling

Flow rate to transport through the very long cooling tube coil. This has u.a. to the disadvantage that cooling water pumps must be operated to carry the cooling water at high power. Also, cooling water pumps must be provided at all, which spend a correspondingly high performance. These previously necessary measures to ensure adequate cooling of the grate bars and the grate as a whole are expensive, expensive and maintenance-prone.

The object of the present invention is to provide a grate bar in which the problems known in the prior art are solved.

The object is achieved according to the invention by a

Grate bar for incinerators with a substantially closed, facing the combustion side

Surface, one rear, to rest on one Rostträger trained support area and a front, extending between the surface and leading edge

Nose area with a support area formed on the underside, as well as an integrated in the grate bar

Rust cooling tube system for passing one

Coolant. The grate cooling tube system has a

Input manifold for supplying the cooling liquid, an output collector for discharging the cooling liquid and a plurality, each individually fluid-tight with the

Input manifold and output collector connected cooling tubes. In the grate bar according to the invention, the cooling water is thus conducted via cooling tubes which are laid or interconnected in parallel. As a result, the total flow cross-section increases, which is advantageously a

significantly reduced compared to the prior art

Pressure loss has the consequence. The cross-sectional area of each of the input manifold and output collector can be selected correspondingly large. For example, the cross-sectional area of each of the input manifold and the output collector may be selected to be in the

Substantially of the summed cross-sectional area of each branching or diverging herefrom, connected in parallel cooling tubes (flow or return)

corresponds.

In a preferred embodiment, a plurality of the cooling tubes are substantially in a plane parallel to

Surface of the grate bar and preferably parallel to each other, preferably parallel to the longitudinal extent of the Rust bar, arranged. In this embodiment, several cooling tubes (eg, two, three, or more cooling tubes) branch off the input manifold and extend into

Longitudinal extension of the grate bar towards the front of the grate bar. The cooling water flows through these cooling tubes to the front of the grate bar and is deflected here. Thereafter, the cooling water also flows back through several cooling tubes (preferably also two, three or more cooling tubes) to the output collector in the rear region of the grate bar. It can thus be a uniform

Distribution of the cooling tubes and thus the total cooling can be achieved within the RostStabkörpers. In one example, at least two adjacent cooling tubes are connected to the input manifold via a first end thereof

Supply of the cooling liquid connected (flow) and further at least two adjacent cooling tubes via the first end to the output collector for discharging the cooling liquid (return) fluid-tightly connected. The number of cooling tubes for each of the flow and return can be identical.

In a preferred embodiment, the

Input distributor and output collector preferably

next to each other in the rear area of the grate bar

arranged. The input manifold and output collector may each be aligned substantially perpendicular to the extension of the cooling tubes and are with all

Cooling tubes connected fluid-tight. The cross-sectional area of the input distributor can be substantially equal to the be summed cross-sectional area of the branching therefrom cooling tubes. Also, the cross-sectional area of the output header may be substantially equal to the summed cross-sectional area of the cooling tubes opening into the output header. By the total increased

Cross-sectional area, a pressure loss can be minimized.

In a preferred embodiment, the cooling tubes open into a deflecting distributor of the grate bar arranged in the front region of the grate bar. The Umlenkverteiler may be aligned substantially perpendicular to the extension of the cooling tubes and is fluid-tightly connected to all cooling tubes. The cross-sectional area of the deflection distributor can be substantially equal to the summed cross-sectional area of those cooling tubes through which the cooling water flows into the deflection distributor. Conversely, the

Cross-sectional area of the Umlenkverteilers be substantially equal to the summed cross-sectional area of those cooling tubes through which the cooling water flows out of the Umlenkverteiler. The cross-sectional area of all the cooling tubes may be substantially the same. Due to the arrangement of the

Umlenkverteilers in the front region of the grate bar, this front area, which is exposed during operation of the grate bar (firing) a very high heat input, cooled particularly reliable. In continuation of the aforementioned example, the cooling tubes are connected via a second end thereof, which is opposite to the first end, fluid-tightly connected to the Umlenkverteiler. In a further preferred embodiment of the grate bar according to the invention, the input distributor and output collector are arranged in the region of the side wall of the grate bar and for this purpose run essentially parallel. In this embodiment, the

Input manifold and output collector substantially in the direction of the longitudinal extent of the grate bar and the cooling tubes extend substantially perpendicular thereto. In one example, a cooling tube in the front region of the grate bar may have a cross-sectional area which is increased in relation to the cross-sectional area of the respective further cooling tubes. As a result, the particularly great heat in the front region of the grate bar can be better dissipated during operation.

In a preferred embodiment, at least one support area cooling tube is arranged offset to a plane along which the further cooling tubes extend. Due to the staggered arrangement, portions of the grate bar which are exposed to a very high heat input, such as e.g. the front area of the grate bar

Overall, the leading edge, the support area, etc., are better cooled.

In a preferred embodiment, the at least one offset to the plane support area cooling tube in

Support area of the grate bar arranged. Through this

Arrangement, the particularly high heat in operation at the Leading edge and / or be better dissipated in the support area of the grate bar.

In a preferred embodiment, the cooling tubes are round, oval or angular in cross-section. In other words, in relation to the grate bar, the aspect ratio between the maximum width and maximum height of at least one of the cooling tubes in cross section may be greater than 1, wherein the width of the cooling tube is defined parallel to the surface of the grate bar, and wherein the height of the cooling tube segment perpendicular to Width is defined. In one example, the aspect ratio is in a range between greater than 1 and 5.

In a preferred embodiment, the grate bar comprises at least one grate bar connecting pipe, which for

Fluid communication with at least one further, adjacent grate bar is formed, preferably such that the grate bar connecting pipe with the input manifold and output collector of each adjacent grate bars

is fluid-tight connectable and preferably U-shaped

is formed and at least partially runs below the side edge of the grate bar. Thus, that can

Cooling water reliably between the adjacent grate bars by a row of a grate - for example, starting from an outer grate bar to the opposite outer grate bar - are passed. The wiring effort is thereby reduced. In one example, the connections of the grate bar connecting tube between the output collector of a grate bar and the input manifold of a respective adjacent grate bar respectively welded joints. In another example, the connections may each be flange connections.

The invention further relates to a grate comprising a plurality of grate bars according to any one of claims 1-9, wherein each adjacent grate bars are fluid-tightly interconnected via at least one grate bar connecting tube.

Thus, a grate with several transverse rows is made

created next to each other arranged grate bars. In one example, the rust in a grate firing of

Incineration plants are used, wherein at least one

Transverse row is arranged with grate bars according to the invention movable in the grate and, following the first transverse row, a next transverse row with grate bars according to the invention is fixedly arranged. It can thereby be achieved that the combustion material is continuously in the direction of

Combustion side is moved. In one example, the grate bar with its contact surface overlaps the surface of a subsequent grate bar in an imbricated manner.

The invention further relates to a combustion plant comprising a grate according to claim 10.

Embodiments of the present invention will be explained in more detail below with reference to figures. Show it : Fig. 1 is a sectional view of a grate bar in

Top view in a first aspect of a first embodiment;

2A, B show several sectional views of a grate bar in a second aspect of the first embodiment;

3A, B show several sectional views of a grate bar in a third aspect of the first embodiment;

Fig. 4 is a sectional view of a grate bar in

Top view in a first aspect of a second embodiment;

5A, B show several sectional views of a grate bar in a second aspect of the second embodiment;

Fig. 6 is a sectional view of a grate bar transverse row comprising a plurality of grate bars; and

Fig. 7 exemplary cross-sections of cooling tubes.

Figure 1 shows a sectional view of a grate bar 100 in plan view in a first aspect according to a first embodiment. The grate bar 100 is a cast element with a cast and thus in the grate bar 100 integrated grate cooling tube system 102 for passing a

Coolant, e.g. Cooling water. Thus, the cooling water can be passed through the grate bar 100 by means of the grate cooling tube system 102 to cool it or dissipate heat. The cooling water can be passed through a plurality of juxtaposed grate bars (not shown), these grate bars via corresponding

Connecting lines are interconnected, as in the following in connection with FIG. 6 in more detail

described. The cooling water can then one

Heat exchanger (not shown) can be supplied, in which the cooling water can be cooled before it is fed back to a respective grate bar in a closed circuit. Alternatively and depending on

respective operation, the cooling water can also be heated.

The grate cooling tube system 102 includes an input manifold 104 for distributing the cooling water. Of the

Input distributor 104 may be connected at a portion to an input line 106 via which the

Cooling water is passed into the grate bar 100. In the embodiment shown in FIG

Input manifold 104 two cooling tubes 108 ', 108 ^{1 1} from which extend to the front portion of the grate bar 100, parallel to each other. The two cooling tubes 108 ', 108''in turn lead into a Umlenkverteiler 110, which in the front region of the grate bar 100 in Substantially perpendicular to the cooling tubes 108 ', 108 ^{1 1} extends. Here, the Umlenkverteiler 110 may extend over the essential width of the front portion of the grate bar 100. From Umlenkverteiler 110 in turn show two other cooling tubes 112 ', 112'', which - also substantially parallel to each other - extend to the rear of the grate bar 100. These cooling tubes 112 ', 112''open into an output collector 114. The output collector 114 is in turn with a

Output line 116 connected via which in the

Output collector 114 parallel incoming cooling water from the grate bar 100 is discharged. The input distributor 104 and the output collector 114 are thus arranged together in the rear region of the grate bar 100. Further, the input manifold 104 and output collector 114 may be disposed at the same level.

In the front region of the grate bar 100, for example in the section of the support region, a further cooling tube or support region cooling tube 118 can also be arranged, which can likewise extend substantially over the width of the front region. This bearing area cooling tube 118 is thus arranged offset with respect to a plane to which the cooling tubes 108 ', 108'',112', 112 '' extend, more precisely arranged offset in the downward direction. This support region cooling tube 118 is connected via respective connecting lines (described later) to individual ones of the cooling tubes 108 ', 108 ", 112', 112" and thus likewise flows through cooling water. For example, the support area cooling tube 118 is connected to the respective outer cooling tubes 108 'and 112'. Thus, the support area, which is exposed to a particularly strong heat in operation, be further reliably cooled.

In summary, the cooling water flows over the

Input line 106 into the input manifold 104 and then flows in a direction indicated by arrows in parallel over the two cooling pipes 108 ', 108' '(ie divided into several parallel lines) to the front region of the grate bar 100 and the Umlenkverteiler 110 arranged therein. The cooling water is deflected by the Umlenkverteiler 110 in a direction indicated by arrows and then passes also distributed in parallel in the two cooling tubes

112 ', 112' '. In addition to the diverter manifold 110, a portion of the cooling water is also diverted over the support section cooling tube 118, as indicated by arrows

clarified. The cooling water then flows in the opposite direction in parallel over the two cooling tubes 112 ', 112' '

(i.e., also split into multiple parallel lines) to the rear of the grate bar 100 in here

arranged output collector 114, as indicated by arrows

displayed. Starting from the output collector 114, the

Cooling water discharged via the output line 116 from the grate bar 100, whereby heat is dissipated.

Thus, the cooling water via a parallel interconnection of the respective combination of cooling tubes, that is Cooling tubes 108 ', 108''(for the flow) and cooling tubes

112 ', 112' '(for the return) are passed through the grate bar 100. The total cross-sectional area of the entire line of the cooling water from the rear area to the front area of the grate bar 100 is composed of the

Single cross-sectional areas of the cooling tubes 108 ', 108' '. Furthermore, the total cross-sectional area of the entire

Direction of the cooling water from the front to the rear of the grate bar 100 from the

Single cross-sectional areas of the cooling tubes 112 ', 112' '

together. Compared to previously known solutions in which the cooling water is passed through a single-strand path through the grate bar, resulting from the inventive solution thus a much reduced pressure loss. in the

Conversely, compared to the prior art, only a reduced pump power has to be applied in order to convey the cooling water through the grate bar 100 between input line 106 and output line 116.

FIGS. 2A, B show the grate bar 100 in a second

Aspect according to the first embodiment in several

Section views. Here, FIG. 2A shows the grate bar 100 in a frontal sectional view, while FIG. 2B shows the grate bar 100 in a side sectional view. In this aspect, the grate bar 100 has a total of six

Cooling tubes arranged, namely cooling tubes 108 ', 108'',108''' (flow) and cooling tubes 112 ', 112'',112''' (return). The rear portion of the grate bar 100 (ie, the right end of the grate bar 100 in FIG. 2B) is referred to as a support portion 120 formed with a cup-shaped socket. In this socket engages a suitably trained pin 122 of a scaffold tower of an incinerator (both not shown). The front portion of the grate bar 100 includes one between its surface and

Combustion surface 124 and front edge 126 of the grate bar 100 rounded nose portion 128. The nose portion 128 is hereby as a continuation of the overhead

Combustion surface 124 continues. At the bottom of the front portion of the grate bar 100 is the aforementioned one

Support area 130 formed. The grate bar 100 is bounded on its underside by edge edges and longitudinal side edges 132 ', 132 ", respectively.

In this exemplary aspect according to the first

Embodiment, the input manifold 104 is fed via the input line 106 with cooling water. In this aspect, the input line 106 is laid in a portion behind the pin 122. As described above in connection with FIG. 1, the support area 130 is cooled by the support area cooling tube 118 arranged therein. This support region cooling tube 118 is connected, for example via respective intermediate tubes with the cooling tubes. In the aspect shown in FIG. 2B, the support area cooling tube 118 is connected to the

Cooling tube 108 'connected. For illustrative reasons, the connection between the support region cooling tube 118 and a further cooling tube, eg cooling tube 112 ', via a respective further intermediate line is not shown. FIGS. 3A, B show the grate bar 100 according to the first embodiment in a third aspect. Compared to the second aspect shown in Figures 2A, B, the

Leading edge 126 further down so that the

Bottom thereof can make up the support portion 130 of the grate bar 100. In this aspect, the cooling tubes (for illustrative reasons, only cooling tube 108 'can be seen) follow the course from the curvature in the portion of the leading edge 126 to a portion in the support area

130. The respective ends of the cooling tubes are connected to the deflection manifold 110 in the manner previously described. In this aspect, therefore, the leading edge 126 and / or the support area 130, which are exposed during operation a particularly high heat input, reliably through the flowing through the cooling tubes and at the same time by the Umlenkverteiler 110 cooling water

reliably cooled.

Figure 4 shows a grate bar 200 in a sectional view in plan view in a first aspect according to a second embodiment. In the grate bar 200, a grate cooling tube system 202 for removing heat by flowed through

Integrated cooling water. The grate cooling tube system 202 includes an input manifold 204 for distributing the cooling water. The input distributor 204 is arranged in the region of the side wall of the grate bar 200 and extends for this purpose in the

Essentially parallel. From the input manifold 204, twelve cooling tubes 206 ¹ -206 ⁿ branch off in this exemplary aspect. Of course, more or fewer cooling pipes can branch off from the input distributor 204. In the front region of the grate bar 200 is at the distal end of

Input manifold 204 further arranged a front edge cooling tube 210 with an enlarged cross-section. About this leading edge cooling tube 210, the front edge of

Roststabes 200 cooled particularly reliable.

The leading edge cooling tube 210 and the individual cooling tubes 206 ¹ -206 ⁿ , in turn, individually discharge into an output manifold 214. Thus, the cooling water can be distributed through the input manifold 204 to the cooling tubes 206 ¹ -206 ⁿ and the diverter manifold 210 as indicated by arrows. Over this, the heated cooling water flows to the output collector 214, is collected there, and then flows over the

Output collector 214 toward the rear of the grate bar 200, as indicated by arrows. Finally, the heated cooling water is discharged from the grate bar 200. By discharging the heated cooling water of the

Rust bar 200 completely reliably cooled.

FIGS. 5A, B show the grate bar 200 in a second

Aspect according to the second embodiment in several

Section views. Also in this aspect, the rear portion of the grate bar 200, in Fig. 5B, the right end of the grate bar 200, as a support portion 220 with a

cup-shaped socket formed in which a

appropriately trained pin 222 of the scaffold of a combustion system can intervene. The grate bar 200 is bounded on its underside by edge edges and longitudinal side edges 232 ', 232 ", respectively. In the support area 230 is also a

Pad cooling tube 234 is arranged, which may extend substantially across the width of the front portion 230. About this support area cooling tube 234 of the support area 230 is cooled separately. The

Support area cooling tube 234 is replaced by the

Input distributor 204 via a shown in the figure

Intermediate line 236 'fed with cooling water. At the

the opposite end of the support area cooling tube 234, the heated cooling water flows via a further intermediate line not shown in the figure in the output collector 214. In the aspect shown in Figure 5B is the

Input manifold 204 fed via an input line 238 with cooling water. The heated cooling water is

subsequently removed from the grate bar 200 via an output line (not shown).

Figure 6 shows sectional views of a plurality of grate bars 100'-100 "" arranged side by side to form a transverse row 300 from a grate for an incinerator. In the example shown in FIG. 6, the individual grate bars 100'-100 "'are configured according to the second aspect of the first embodiment shown in FIGS. 2A, B.

Of course, the grate bars may also be configured according to other examples, aspects or designs. An outer grate bar 100 'of the transverse row 300 (in FIG. 6, the grate bar 100' on the far left) is supplied via a supply line 302 with cooling water. The cooling water flows into one with the

Feed line 302 fluid-tightly connected input manifold 104 of the grate bar 100 '. Starting from this input distributor 104, the cooling water flows distributed in parallel over the three cooling tubes 108 '- 108' ^{1 1} (into the plane of the figure) in the direction of the front region of the grate bar 100 '. The heated cooling water can then be deflected via a Umlenkverteiler not shown in Figure 6 and the three

Cooling tubes 112 '-112' '' distributed. The cooling water then also passes in parallel across the three cooling tubes 112'-112 '' '(out of the plane of the figure) back to the rear region of the grate bar 100' and opens into the output collector 114.

The output manifold 114 is fluid tightly connected to one end of a grate bar connecting tube 304 ', which in turn is connected at its other end to the input manifold of the adjacent grate bar 100 ". Thus, the cooling water flows in the previously described way and

Through the first grate bar 100 'and then passes through the grate bar connection pipe 304' to the respective adjacent grate bar 100 ', etc. The respective grate bar connecting pipes 304'-304' '' are U-shaped and each extending below the respective side edges

132 ', 132' 'of the grate bars 100' -100 '' ''. From the last grate bar 100 '' '' of the grate bar transverse row 300 will heat up

Cooling water discharged via a discharge line 306 from the grate bar transverse row 300 and then can not eg one shown are supplied to the heat exchanger in which the cooling water is cooled before it is returned to the grate bar 100 'in a closed circuit, for example. The grate bar connection pipes 304'-304 '''may be welded to the respective output manifold and input manifold of the adjacent grate bars 100'-100''''.

Alternatively, a flange connection can be provided for connection.

Figure 7 illustratively illustrates different

Cross sections of exemplary cooling tubes 108, 112 which may be used in the previously described exemplary configurations. The cooling tubes 108,112 may be round, oval or angular in cross-section (with or without

rounded corners). The cross-sectional areas can be different. When installed in a grate bar, the aspect ratio between maximum width and

maximum height of one or more of the cooling tubes

108,112 in cross section <1. Under this assumption, the width of the cooling tube 108, 112 is defined parallel to the surface of the grate bar and the height of the cooling tube 108, 112 is defined perpendicular to the width. In one example, the aspect ratio may be between 1 and 5.

Alternatively or additionally, the input distributors described above and shown in the drawing,

Output collector and / or deflecting distributor in cross-section round, oval or square (not shown). By the embodiment described above take the

Cooling tubes, input distributor, output collector and / or deflection distributor with a simultaneously large

Cross-sectional area a small height. Thus, since the flow cross-section of the individual cooling tubes,

Input manifold, output collector and / or Umlenkverteiler is still large, the height of the grate bar body can be reduced in total, without the limitations in the

Cooling capacity occur. This advantage allows total material (casting material) of the grate bar can be saved, which costs and weight of the grate bar can be reduced.

Claims

claims

1. grate bar (100, 200) for incinerators with

a substantially closed, the

A rear face (120; 220) formed to rest on a grate support and a forward nose portion (124; 224) and leading edge (126; 226) extending therefrom

(128; 228) with one on the bottom

trained support area (130, 230), and one in the grate bar (100, 200) integrated

A grate cooling tube system (102, 202) for passing a cooling fluid, the grate cooling tube system

(102; 202) an input manifold (104; 204) for supplying the cooling liquid, an output collector

(114; 214) for discharging the cooling liquid and a plurality of fluid-tight in each case with the input manifold (104; 204) and output collector

(114, 214) has associated cooling tubes (108 '- 108''', 112 '- 112''', 206 ¹ - 206 ⁿ ).

2. grate bar (100) according to claim 1, wherein a plurality of the cooling tubes (108 '-108' '', 112 '-112' '') substantially in a plane parallel to the surface of the grate bar (100) and preferably parallel to each other , preferably parallel to

Longitudinal extension of the grate bar (100), are arranged.

3. grate bar (100) according to claim 1 or 2, wherein the input manifold (104) and output collector (114) preferably side by side in the rear

Area of the grate bar (100) are arranged.

4. Grate bar (100) according to one of the preceding

Claims in which the cooling tubes (108 ')

108 '' ', 112' -112 '' ') into a deflecting distributor (110) of the grate bar (100) arranged in the front region of the grate bar (100).

5. grate bar (200) according to claim 1, wherein the input manifold (204) and output collector (214) in the region of the side wall of the grate bar (200) are arranged and extend substantially parallel thereto.

6. grate bar (100; 200) according to any one of the preceding claims, wherein at least one

Supporting region cooling tube (118, 234) is arranged offset to a plane along which extend the further cooling tubes (108 '-108''', 112 '-112'''; 206 ¹ -206 '').

7. grate bar (100; 200) according to claim 6, wherein the at least one offset to the plane support area- Cooling tube (118, 234) in the support area (130, 230) of the grate bar (100, 200) is arranged.

A grate bar (100; 200) according to any one of the preceding claims, wherein the cooling tubes (108'-108 ''',112' -112 ''', 206 ¹ -206 ⁿ ) are round, oval or angular in cross-section.

A grate bar (100; 200) according to any one of the preceding claims, further comprising at least one

Grate bar connecting pipe (304 '- 304' ''), which is designed for fluid communication with at least one further, adjacent grate bar, preferably such that the grate bar connecting pipe (304 '- 304' '') with the input manifold and

Output collector of each adjacent grate bars is fluid-tightly connected and preferably U-shaped forms and extends at least partially below the side edge of the grate bar.

Grate comprising a plurality of transverse rows (300) of grate bars (100; 200) according to any one of

preceding claims, wherein each adjacent grate bars via at least one grate bar connecting pipe (304 '-304' '') fluid-tight

connected to each other. Combustion plant comprising a grate according to claim 10.