JP5549890B2 - Air-cooled grate block - Google Patents

Abstract

The air-cooled grate block (1) has a block body (5) embodied as a cast part, which has an upper wall (10) and a front wall (20). The upper wall forms a bearing surface (15), and a base (25) is pre-formed in the front wall. A cooling channel (40) is connected with another cooling channel (60). Another cooling channel is formed at a wall inlet (35) by one of an inlet opening (50) arranged adjacent to the base. The front wall and a cooling channel wall (55) are spaced from the upper wall. An independent claim is included for a grate with multiple grate block rows.

Description

The present invention relates to a grate block as part of a grate in a waste heat treatment plant.

  The core of the waste incineration plant is the incineration grate. Here, waste, for example household waste, is carried from one end of the incineration grate to the other. A sufficient amount of oxygen required for the combustion of waste is present in the air. In the process, air, also called primary air, is forcibly sent from below through the incineration grate and is supplied to the combustion space containing the waste to be incinerated.

  One of the various known incineration grate types is a “stair grate”. Such a staircase grate is composed of a plurality of grate blocks that are arranged side by side and fixedly coupled to form individual grate rows. The grate block rows that are connected to each other are offset from each other in a step-like manner and one is placed on the other, and the front wall of the grate block that forms the grate block row faces the combustion space. For example, every other grate block row is movably arranged. The waste is transported to the next grate block row in the transport direction by the lifting movement of these movably arranged grate block rows.

  The waste that is incinerated at the incineration plant described above is actually varied. The range extends from household waste to industrial waste and actual fuels such as sawdust, biomass, and wood in such forms. Of course, the calorific values of these wastes vary greatly depending on the type of waste. However, even one type of waste has a significant difference in terms of calorific value. These significant heat generation differences can cause considerable differences in the thermal and mechanical loads of the incineration grate, eg, individual grate blocks.

  At an average heating value (up to about 10 MJ / kg), the incineration grate or individual grate block can be sufficiently cooled by air (primary air). An incineration grate with a water-cooled grate block for waste with a high calorific value is known from the prior art. It is important to cool the grate block sufficiently, otherwise there is a risk that the incineration grate will melt.

  Patent Document 1 describes a grate block having a cooling space for water on the lower side in the opposite direction from the incineration space.

  U.S. Pat. No. 6,057,051 describes a grate block having a cooling element mounted under a waste support surface. Water is used for cooling.

  Patent Document 3 describes an air-cooled grate plant having a passage formed below the upper surface of the grate plant.

  Water-cooled grate blocks provide a means that allows the production of efficiently cooled incineration grate, but such incineration grate is both air-cooled grate block both in its manufacture and subsequent processing It has the disadvantage of being much more expensive than in the case of an incineration grate composed of

  The object of the present invention is to provide a grate block having at least superior wear resistance and an equivalently long service life compared to a water-cooled grate block, thereby simultaneously increasing the production and subsequent processing aspects. It is to avoid the disadvantages of the water-cooled grate block in terms of cost.

European Patent No. 1191282 European Patent No. 121989 German Patent No. 102004032291

  This object is achieved by a grate block having the features of independent claim 1. Preferred embodiments are the subject matter of the dependent claims.

  The grate block according to the invention has the features according to claim 1. The grate block has a block body designed as a cast part. The block body has an upper wall forming a support surface and a front wall integrally formed with feet. A grate block is a part of a grate for heat treatment of waste. In this case, the grate blocks are arranged stepwise up and down, and each grate block has a supporting surface formed by the upper wall of the next grate block with the foot part integrally formed on the front wall. Placed on top (stair grate). The waste to be heat treated is likewise placed on the support surface formed by the top wall. The grate can have a slope. This inclination is in the range of 0 ° to 26 °, preferably in the range of 10 ° to 18 ° with respect to the virtual horizontal plane. The wall entrance is located below the upper wall. This wall entrance is located on the side of the upper wall away from the combustion space. A first cooling passage section starting from the wall inlet extends along the top wall and the front wall to an outlet opening disposed in the front wall. The inlet opening is disposed adjacent to the front wall and the foot formed integrally therewith. A cooling passage wall located at a distance from the front wall forms a second cooling passage portion that begins at the inlet opening and fluidly connects to the first cooling passage portion at the wall inlet.

  The first cooling passage portion and the second cooling passage portion form a substantially S-shaped passage in the longitudinal section. The cross-sections or cross-sectional areas of the first cooling passage part and the second cooling passage part, and thus the cross-sections or cross-sectional areas of the substantially S-shaped passages are constant in the simplest embodiment. However, this cross section may vary.

  The grate block according to the invention allows the use of a gas cooling medium, in particular air, during the heat treatment of wastes with a high calorific value (> 10 MJ / kg). Water cooling, which is often required in the case of waste having a high calorific value, becomes unnecessary. The grate block of the present invention allows for excellent and fragmented cooling of such portions of the grate block that are subjected to maximum heat loads. This is very advantageous in the case of air because the primary air available for cooling is limited. Further, since the primary air used for cooling is heated to approximately 120 ° to 150 °, preheating of the primary air (which has been necessary so far) is unnecessary. In addition to eliminating primary air preheating, more cooling air can be used for cooling than previously possible. Thereby, the cooling is further improved overall. The grate according to the present invention achieves an excellent effect, that is, a long service life compared to the service life of a water-cooled grate block.

  In a preferred embodiment, the first cooling passage portion and the second cooling passage portion extend with a change in cross section. Here, the “cross section” refers to the cross sectional areas of the first and second cooling passage portions. The shape of the cross-sectional area may change. Possible cross-sectional shapes are rectangles, squares, polygons such as chamfered hexagons, circles or ellipses.

  Heat removal by a gas cooling medium, preferably primary air, determines the amount of heat release by the cooling medium per unit time. The heat removal depends in particular on the surroundings, in this case in particular the flow rate of the cooling medium relative to the first and second cooling passages. This increases as the flow rate of the cooling medium increases.

  If the cross-sections of the two cooling passages are different, this means that the cross-sectional area changes. Its cross-sectional area can be smaller or larger. For example, as the cross-sectional area becomes smaller, the flow rate of the gas cooling medium, preferably cooling air, increases, which increases cooling and, as a result, increases the heat removal by the gas cooling medium. Increased heat removal means that the gas cooling medium absorbs more heat from its surroundings and releases it by increasing the flow rate due to the reduced cross-sectional area. By corresponding changes in the cross-section of the first and second cooling passages, highly fragmented cooling of the individual parts of the grate block is achieved. As a result, this cooling can be adapted to the specific heat load at the site of the individual grate block. Thereby, for example, the front wall of the grate block can be intentionally increased in range and cooled.

  Enlarging the cross section of the first cooling passage or the second cooling passage in a region that is heat-loaded in a smaller range reduces the flow rate of the gas cooling medium, eg primary air, and thereby the heat achieved. Removal is also reduced. This allows a limited amount of cooling medium, for example primary air, to cool the grate, which is also clearly heat-loaded to a smaller area, thereby improving the overall cooling. The

  In another embodiment, the grate block has ribs extending in the longitudinal direction of the block body. The ribs are integrally formed on the upper wall and the front wall, and are arranged substantially perpendicular to them. The stability of the grate block is enhanced by the ribs.

  In a preferred embodiment, this rib is a central rib, i.e. arranged centrally as viewed in the transverse direction of the block body. Furthermore, the central arrangement of the ribs simplifies the production of the grate of the invention by casting by allowing the same half mold to be used.

  In a preferred embodiment, the first cooling passage portion of the grate block of the present invention and the second cooling passage portion connected thereto extend over the entire length of the upper wall. Cooling of the grate block over the entire length of the upper wall is thus achieved.

  However, according to a further embodiment, the first cooling passage part and the second cooling passage part may extend over only a part of the length of the upper wall. The first cooling passage portion and the second cooling passage portion preferably extend for 10% to 90%, particularly preferably 30% to 70%, of the length of the upper wall of the grate block.

  In a further embodiment of the grate block of the present invention, the cross section of the second cooling passage section increases from the inlet opening toward the wall inlet. On the other hand, the cross section of the first cooling passage portion decreases from the wall portion inlet toward the outlet opening. The cross-sectional change can be performed both continuously and stepwise. For example, if the first and / or second cooling passage portion has a conical portion, a continuous cross-sectional change is obtained. Zones that are cooled in different ranges are obtained in the first cooling passage portion and the second cooling passage portion by changing the cross sections of the first cooling passage portion and the second cooling passage portion. In this case, the cooling is weaker in zones with larger cross sections and stronger in zones with smaller cross sections.

  In another embodiment, the grate block has a deflection web that is integrally formed with the rib, preferably the central rib, and projects perpendicularly from the rib. These deflection webs are arranged offset from each other.

  In a further embodiment, the deflection web forms a serpentine passage that is fluidly connected to the second cooling passage portion at the inlet opening. In this case, the position of the passage entrance opening is determined by the position of the grate block relative to the grate block after a certain direction L.

  The direction L is the vertical direction of the grate and coincides with the transport direction of the waste. In the treatment process, waste passes through the various zones, starts at the drying zone at one end of the grate, passes through the combustion zone, and proceeds to the burnout zone at the other end of the grate opposite the drying zone.

  In a preferred embodiment, the upper wall of the grate has a trough-shaped recess on the side facing the combustion space.

  The trough-shaped recess is arranged in the region of the upper wall adjacent to the front wall of the grate block. Waste or slack is placed in this area continuously during operation of the grate, which creates a significant heat load.

  Incineration waste or slag collects in these trough-type recesses during operation of the incineration grate. Incineration waste or slag forms an insulating layer between the top wall and the combustion space, which reduces the amount of heat input from the combustion space to the grate block.

  The grate block according to the present invention can be used for a grate. Such a grate preferably consists only of the grate block of the present invention.

  The grate generally has a plurality of fixed grate block rows and a plurality of movable grate block rows. These grate block rows are formed by a plurality of grate blocks arranged side by side and attached to a block holding tube, and these adjacent grate blocks are fixedly coupled to each other. The fixed and movable grate block rows are arranged alternately in a staircase pattern. In this case, both the fixed and movable grate block rows are formed by the grate block of the present invention.

  The block holding tube of the fixed grate block is attached to the fixed bracket, while the block holding tube of the movable grate block is attached to the movable grate feed mechanism. These grate feeding mechanisms are driven by, for example, a hydraulic cylinder, and are moved forward and backward via rollers in a processing step. As a result, the movable grate block row is similarly moved, thereby exerting a pressing and shearing effect on the waste placed on the grate. As a result, the waste is first circulated and the new waste portion is continuously heat treated in the combustion chamber. Next, continuous transport of waste in this way towards one end of the grate is thus achieved.

  In the following, the grate block according to the invention will be described in more detail with reference to exemplary embodiments which are only schematically shown in the drawings.

It is a longitudinal cross-sectional view of 1st Embodiment of the grate block of this invention. FIG. 6 is a longitudinal sectional view of a further embodiment of the grate block of the present invention. And FIG. 6 is a longitudinal section view of a further embodiment with the upper wall of the grate block of the present invention extended. FIG. 6 is a longitudinal cross-sectional view of a further embodiment of the grate block of the present invention having a generally S-shaped cooling passage with a length intermediate the distance from the front wall to the rear wall. FIG. 6 is a longitudinal cross-sectional view of a further embodiment of the grate block of the present invention having a short generally S-shaped cooling passage. FIG. 6 is a longitudinal cross-sectional view of a further embodiment of the grate block of the present invention having a deflecting web offset in addition to a short substantially S-shaped cooling passage. It is sectional drawing of one Embodiment of the grate block of this invention. FIG. 6 is a cross-sectional view of a further embodiment of the grate block of the present invention. FIG. 6 is a cross-sectional view of a further embodiment of the grate block of the present invention having a trough-type recess on the side of the upper wall facing the combustion space. It is sectional drawing of three grate blocks arrange | positioned side by side according to FIG. It is sectional drawing of the three grate blocks arrange | positioned side by side according to FIG. It is sectional drawing of three grate blocks arrange | positioned side by side according to FIG. It is a figure which shows the state which the grate block arrange | positioned so that the movement of the four grate blocks arrange | positioned up and down stepwise according to embodiment of FIG. 6 has moved forward completely. It is a figure which shows the state by which the grate block arrange | positioned so that the movement of the four grate blocks arrange | positioned up and down stepwise according to embodiment of FIG. 6 was arrange | positioned in the center position. It is a figure which shows the state which the grate block arrange | positioned so that the movement of the four grate blocks arrange | positioned up and down stepwise according to embodiment of FIG. 6 was moved completely back. FIG. 10 is a perspective view according to the embodiment of FIG. 9 having trough-type recesses in four grate blocks arranged side by side. 14b is an enlarged detail view of one of the trough-type recesses according to FIG. 14a. FIG. 4 is a detailed view of a stair grate having a grate block arranged fixed and movable.

  FIG. 1 shows a grate block with a block body 5 designed as a cast part. The block body 5 has an upper wall 10 and a front wall 20 that form a support surface 15. A foot 25 is integrally formed on the front wall 20. The legs 25 are intended to be placed on the support surface 15 of the next grate block 1 so as to be relatively displaceable. A wall inlet 35 is disposed on the lower side 30 of the upper wall 10, that is, on the opposite side of the combustion space 2, from which the first cooling passage portion 40 extends along the upper wall 10 and the front wall 20 to the front part. It extends to an outlet opening 45 located in the wall 20. In the illustrated embodiment, the outlet opening 45 is oriented obliquely downward, ie in the direction of the support surface 15 of the next grate block 1. An inlet opening 50 is disposed adjacent to the foot 25 and the front wall 20, and a cooling passage wall 55 starting therefrom is disposed at a distance from the front wall 20 and the upper wall 10, so that a second cooling passage portion is formed. The second cooling passage portion 60 is fluidly connected to the first cooling passage portion 40 at the wall inlet 35. In the illustrated embodiment, the first and second cooling passage portions 40, 60 are not extended over the entire length of the upper wall 10. The cross sections or cross sectional areas of the first cooling passage portion 40 and the second cooling passage portion 60 shown in FIG. 1 change in the middle of the two cooling passage portions. However, this cross section may be kept constant.

  The grate block according to the present invention has the following dimensions, for example, a length of 500 mm to 700 mm, a height of about 150 mm, and a width of about 100 mm.

  FIG. 2 shows a further embodiment of a grate block according to the invention. The grate block of this embodiment has a rib 65 and a rear wall 75. The rib 65 is formed integrally with the front wall 20, the upper wall 10, the cooling passage wall 55, and the rear wall 75, and is disposed substantially perpendicular thereto. The rib 65 extends from the front wall 20 to the rear wall 75. A hook 80 is provided on the rear wall 75. The grate block 1 is attached to a block holding tube (not shown here) by hooks 80. The outer periphery of the block body 1 is not exactly rectangular. In the grate block 1, the region where the upper wall 10 intersects the front wall 20 is inclined.

FIG. 3 shows a further modified embodiment of the grate block 1 according to the invention. Front wall 20 and top wall 10 at the outer periphery has a result extended the inclined portion the lug 85 that exceeds the outer 21 facing the combustion space 2 of the front wall 20. Thereby, the lug 85 protrudes beyond the outer side 21 of the front wall 20. Thereby, the exit opening 45 is directed substantially vertically downward in the direction of the support surface 15 of the next block body 1.

  FIG. 4 shows another embodiment of a grate block 1 having a block body 5. The block body 5 has a front wall 20, an upper wall 10 and a rear wall 75. The foot 25 is formed integrally with the front wall 20, and the hook 80 is formed integrally with the rear wall 75. The first cooling passage portion 40 extends from the wall inlet 35 to the outlet opening 45 along the upper wall 10 and the front wall 20. A cooling passage wall 55 extending from an inlet opening 50 disposed adjacent to the foot 25 and the front wall 20 is disposed at a distance from the front wall 20 and the upper wall 10, and is first at the wall inlet 35. A second cooling passage portion 60 that is fluidly connected to the cooling passage portion 40 is formed. The first and second cooling passage portions 40 and 60 extend over only a part of the length of the upper wall 10. In the illustrated embodiment, they extend over approximately half the length of the top wall 10 and thus extend over an area that is subjected to a greater heat load.

  FIG. 5 shows an embodiment of a grate block according to the present invention similar to the embodiment illustrated in FIG. In this case, the first cooling passage portion 40 and the second cooling passage portion 60 are regions adjacent to the front wall 20 and extend over only about one third of the length of the upper wall 10.

FIG. 6 shows another embodiment of a grate block 1 according to the present invention. The grate block 1 designed as a cast part has an upper wall 10 and a front wall 20 that form a support surface 15, and a foot 25 is formed integrally with the front wall 20. The legs 25 are intended to be placed on the support surface 15 of the next grate block 1 so as to be relatively displaceable. On the opposite side of the combustion space 2, a wall inlet 35 is disposed on the lower side 30 of the upper wall 10, from which the first cooling passage portion 40 is disposed on the front wall 20 along the upper wall 10 and the front wall 20. Extending to the outlet opening 45 formed therein. In the illustrated embodiment, the outlet opening 4 5 obliquely downward, i.e., are oriented in the direction of the support surface 15 of the next grate blocks 1. An inlet opening 50 is disposed adjacent to the foot 25 and the front wall 20, and a cooling passage wall 55 starting therefrom is disposed at a distance from the front wall 20 and the upper wall 10. A second cooling passage portion 60 that is fluidly connected to the first cooling passage portion 40 is formed. In the illustrated embodiment, the first and second cooling passage portions 40, 60 extend over only about a third of the length of the front portion of the upper wall 10. The cross sections or cross sectional areas of the first cooling passage portion 40 and the second cooling passage portion 60 shown in FIG. 6 change in the middle of these two cooling passage portions. The second cooling passage section 60 starting from the inlet opening 50 has a cross-section that narrows along the front wall 20, and this cross-section extends considerably towards the wall inlet 35. In the first cooling passage portion 40, the expanded cross section narrows again toward the outlet opening 45 into a narrow cross section substantially the same as the flow path of the second cooling passage portion 60 along the front wall 20. Further, the block body 5 is integrally formed with the upper wall 10, the rear wall 75, and the front wall 20, and further has a rib 65 disposed substantially perpendicular thereto. In this embodiment, a hook 80 is provided on the rear wall 75. The deflection web 70 formed integrally with the rib 65 is disposed substantially perpendicular to the rib 65.

In the illustrated embodiment, a total of five deflection webs 70 extend obliquely downward from above the direction L. The direction L also coincides with the transport direction of waste (not shown) placed on the support surface 15. The deflection webs 70 are alternately offset. That is, the upper end of the deflection web 70 is formed integrally with the lower side 30 of the upper wall 10 or is arranged away from the lower side 30 of the upper wall 10, and the lower end portion 72 of the deflection web 70 is The feet 25 are arranged on a plane including the bottom surface 26.

  FIG. 7 shows a cross-sectional view of the grate block 1 of the present invention. The block body 5 has an upper wall 10 having a support surface 15 and a lower side 30 and a rib 65. The first cooling passage portion 40 extends along the upper wall 10. The cooling passage wall 55 spaced from the upper wall 10 forms a second cooling passage portion 60 together with the lower side 30 of the upper wall 10. In the illustrated embodiment, the rib 65 is disposed in the center.

  FIG. 8 shows a further sectional view of the grate block 1. Here, as shown in the drawing, the upper wall 10 of the block main body 5 is divided into four small cooling passages and extends along the upper wall 10 as seen in the sectional view. Further, the cooling passage wall 55 and the second cooling passage portion 60 that are spaced apart from the upper wall 10 can be seen. Furthermore, a rib 65 is shown at the center of the block body 5 and is arranged substantially perpendicularly thereto.

  FIG. 9 shows another embodiment of the grate block 1 of the present invention. Further, the block body 5 has an upper wall 10 that forms a support surface 15 and has a lower side 30, a cooling passage wall 55 that is spaced from the upper wall 10, and a rib 65 disposed in the center. . It can be seen that the first cooling passage portion 40 extends along the upper wall 10, and the second cooling passage portion 60 is similarly formed by the cooling passage wall 55 and the upper wall 10. Further, the upper wall 10 has a trough-type recess 90. As can be seen in the example of FIG. 14 a, this recess 90 extends only over approximately the front third of the grate block 1. The slag collects in the trough-type recess, and as a result, covers the grate block 1 with respect to the incineration space 2. The heat load on the grate block 1 is less in the covered area due to the reduced heat input.

  FIG. 10 shows in detail a cross section of a grate block row with three grate blocks 1 according to FIG. 7 arranged side by side. In this case, the 1st cooling channel | path part 40 and the 2nd cooling channel | path part 60 are combined and formed by the two grate blocks 1 arrange | positioned adjacently in any case. The first cooling passage portion 40 extends along the upper wall 10, whereas the second cooling passage portion 60 is formed by the cooling passage wall 55 and the upper wall 10 that are arranged at a distance from the upper wall 10. The The side boundaries of both the first cooling passage portion 40 and the second cooling passage portion 60 are formed by two adjacent grate block 1 ribs 65, which ribs 65 are individually grate block blocks. About the center.

  FIG. 11 shows in detail a cross section of a grate block row with three grate blocks 1 according to FIG. 8 arranged side by side. The upper wall 10 of the block body 5 of the three grate blocks 1 shown in the figure, the cooling passage wall 44 arranged at a distance from it, and the rib 65 arranged substantially in the center are shown. The first cooling passage portion 40 extends along the upper wall 10. It can further be seen that the first cooling passage section 40 is divided into four smaller cooling passage sections, which extend along the top wall 10 and the front wall 20 to the front wall 20. Opened at the outlet opening arranged. The second cooling passage portion 60 is formed by joining two adjacent grate blocks 1.

  FIG. 12 shows in detail a cross section of a grate block row with three grate blocks 1 according to FIG. 9 arranged side by side. The first cooling passage portion 40 and the second cooling passage portion 60 are formed by being joined by two block bodies 5 arranged adjacent to the grate block 1 in any case. The first cooling passage portion 40 extends along the upper wall 10, while the second cooling passage portion 60 is formed by the upper wall 10 and a cooling passage wall 55 disposed at a distance from the upper wall 10. The The side boundaries of the first cooling passage portion 40 and the second cooling passage portion 60 are formed by the ribs 65 of the two grate blocks 1 arranged adjacent to each other, and these ribs 65 are substantially related to the individual grate blocks. Located in the center. A trough-type recess 90 is likewise shown in the upper wall 10 of the block body 5.

  FIGS. 13a, 13b, and 13c show four grate block rows 100, 101, 102, and 103, each one arranged stepwise behind the other, each row being a plurality arranged side by side. It consists of the grate block 1. The grate block 1 of the illustrated embodiment corresponds to that of FIG. The grate block rows 101 and 103 are movably arranged, whereas the grate block rows 100 and 102 are fixed. The grate blocks 1 of the movable grate block rows 101 and 103 are shown in different positions in FIGS. 13a, 13b and 13c. In FIG. 13a, the grate blocks 1 of the movable grate block rows 101 and 103 are fully advanced in the direction L that coincides with the waste transport direction. In this case, the meandering passage 110 having the passage inlet opening 115 is formed by the deflection web 70 of the grate block 1 of the movable grate block rows 101 and 103, and the gas cooling medium, for example, primary air is passed through the meandering passage 110. Flowing along. In FIG. 13b, the grate block 1 of the movable grate block rows 101 and 103 is fully retracted in the direction L as shown in FIG. 13a and in the opposite direction to the direction L shown in FIG. 13c. It is shown in a central position arranged between the positions. As a result, the length of the serpentine passage 110 and the position of the inlet opening 115 change. As a result, the grate block 1 of the movable grate block rows 101 and 103 is always cooled in the area exposed to the waste in the combustion space 2.

  FIG. 14a shows a perspective view of a grate block row consisting of four grate blocks 1 arranged side by side. Shown here is the top wall 10 forming the support surface 15, the front wall 20 and the foot 25 formed integrally therewith. A rear wall 75 provided with a hook 80 and a rib 65 arranged in the center of the individual grate block 1 are likewise shown. The partially visible cooling passage wall 55 begins at the inlet opening 50 and extends away from the top wall 10 and the front wall 20 toward the wall inlet 35, where the first cooling passage portion 40 is located at the wall inlet 35. A second cooling passage portion 60 is formed in fluid connection with the first cooling passage portion 60. The first cooling passage 40 extends from the wall inlet 35 toward the outlet opening 45 along the upper wall 10 and the front wall 20. In the illustrated embodiment, the block body 5 has a trough-shaped recess 90 in the upper wall 10. Such a trough-shaped recess 90 is arranged on the upper wall 10 in the region of the grate block 1 adjacent to the front wall 20. This area continues to be exposed to the waste being processed.

  FIG. 14b shows an enlarged detail view of the trough-type recess 90 located in the upper wall 10 of FIG. 14a.

  FIG. 15 shows a longitudinal sectional view of an incineration grate with a grate block 1 one after the other arranged in a staircase shape known from the prior art. The grate block 1 is not arranged horizontally and rises obliquely in the direction L.

Claims (12)

A plurality of grate blocks (1) are air-cooled grate blocks for waste heat treatment grate arranged stepwise so that one of them is placed on the other,
Designed as a cast part, an upper wall (10) forming a support surface (15), a front wall (20) integrally formed with a foot (25), and a lower side of the upper wall (10) A first wall extending from the wall inlet (35) disposed in (30) along the upper wall (10) and the front wall (20) to an outlet opening (45) disposed in the front wall (20). A block body (5) having one cooling passage (40),
Starting from an inlet opening (50) located adjacent to the foot (25) and the front wall (20), and spaced from the front wall (20) and the upper wall (10) The grate characterized in that the cooling passage wall (55) forms a second cooling passage portion (60) fluidly connected to the first cooling passage portion (40) at the wall portion inlet (35). block.   The grate block according to claim 1, wherein the first cooling passage portion (40) and the second cooling passage portion (60) extend with a change in cross section. The grate block according to claim 1 or 2 , wherein the first cooling passage portion (40) and the second cooling passage portion (60) extend over the entire length of the upper wall (10). Said first cooling passage (40) and the second cooling passage (60), according to claim 1 or 2, characterized in that there extends the Activity over only a portion of the length of said top wall (10) Grate block. The cross section of the second cooling passage part (60) increases from the inlet opening (50) toward the wall part inlet (35), and the cross section of the first cooling passage part (40) is the wall part inlet. (35) grate block according to any of claims 1 to 4, characterized in that to reduce I toward or to said outlet opening (45) from. The block main body (5) has a rib (65) extending in the longitudinal direction, integrally formed with the upper wall (10) and the front wall (20), and arranged substantially perpendicular thereto. The grate block according to any one of claims 1 to 5 , wherein: The grate block according to claim 6 , wherein the rib is a central rib. Before Kivu lock body (5), characterized in that it has integrally formed, projecting perpendicularly from the rib, a plurality of deflection webs (70) which are arranged offset from one another in the rib (65) The grate block according to claim 6 or 7 .   The deflection web (70) is fluidly connected to the second cooling passage (60) at the inlet opening (50) to form a meandering passage (110) having a cooling inlet opening (115), and the cooling inlet opening. The grate block according to claim 8, wherein the position of (115) depends on the position of the grate block (1) relative to the next grate block in a certain direction (L).   Grate block according to any one of the preceding claims, characterized in that the upper wall (10) has a trough-shaped recess (90) facing the combustion space (2).   A grate comprising the grate block according to any one of claims 1 to 10.   A plurality of fixed grate block rows and a plurality of movable grate block rows arranged alternately, and the plurality of grate blocks are mounted side by side on the grate holding tube and fixedly coupled to each other. 11. Each of the grate block rows is formed, and both the fixed and movable grate block rows are formed by the grate block according to claim 1. Grate described in.

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