KR20090083838A - Combustion apparatus for solid fuel - Google Patents

Abstract

A solid fuel combustion device is provided to burn solid fuel effectively and completely by burning the solid fuel while the solid fuel is lifted by a lifting unit and supplying air to the solid fuel. A solid fuel combustion device(10) comprises a furnace(11), a plurality of fire grates(20,21,22), a water cooling unit, a lifting unit, and a heat recovery unit. The fire grates burns solid fuel while the solid fuel is lifted. The water cooling unit cools the fire grates by circulating cooling water. The lifting unit lifts the slid fuel using the air supplied to the fire grates. The heat recovery unit surrounds the furnace, and is equipped with a water jacket which circulates cooling water to the exterior of the furnace to recovery the heat of the furnace and an air jacket which makes the outer wall of the heat recovery unit and the water jacket apart from each other to insulate the water jacket from the outside.

Description

Solid fuel combustion device {COMBUSTION APPARATUS FOR SOLID FUEL}

The present invention relates to a solid fuel combustion device capable of preventing solid fuel from adhering to a grate and effectively recovering heat generated during combustion of a solid fuel in a combustion device for burning solid fuel manufactured using waste plastic. will be.

Solid fuel (RPF; refuse plastic fuel, RDF; refuse derived fuel), developed as one of the alternative energy sources due to the depletion of petroleum resources, screens flammable wastes, and shreds, dries, compresses, dechlorins and additives such combustible wastes. It is manufactured through an injection process and a molding process.

The solid fuel has a high calorific value and is reproduced as a fuel using waste, so it is not only inexpensive but also obtains economic benefits from recycling waste resources. In addition, the solid fuel has a number of advantages, such as no risk of corrosion of the combustion device by the combustion gas generated from the fuel during combustion, and the need for a separate safety facility for the storage of the solid fuel. In addition, due to the advantages of such solid fuel, it is widely supplied as an alternative energy in various industries and farming and fishing villages where the cost of oil is high.

Disclosed are a solid fuel combustion apparatus, which is a boiler of various structures that burns solid fuel and uses heat generated therefrom. Existing solid fuel combustion apparatus is composed of a combustion furnace that provides a space in which the solid fuel is received and burned, and a grate in which the solid fuel is accommodated in the combustion furnace.

By the way, the solid fuel has a property that 40 to 60% or more of the components are made of plastic and easily coagulated due to plasticity and grain amorphousness. Therefore, when the solid fuel is burned, there is a problem in that the solid fuels are agglomerated with each other or adhered to the grate. Due to the coagulation and adhesion of the solid fuel, there is a problem that the particle size of the solid fuel is increased and combustion is not made smoothly. In addition, the coagulation and adhesion phenomenon of the solid fuel is incomplete combustion of the solid fuel, so that a lot of ash remains after combustion, so the amount of waste of the solid fuel is increased and waste in terms of energy and cost.

In addition, the process of burning solid fuel cannot be performed properly due to the solidified fuel, and the combustion efficiency is lowered, so the solidified fuel must be frequently removed. In addition, since the operation of the solid fuel combustion device needs to be stopped in order to remove the solid fuel thus adhered, the operation rate of the solid fuel combustion device is lowered and the productivity is lowered as the solid fuel removal operation is frequently performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a solid fuel combustion device which prevents agglomeration and adhesion of solid fuel and improves combustion efficiency.

Another object of the present invention is to provide a solid fuel combustion device which completely burns solid fuel and reduces the amount of ash after combustion.

In addition, the present invention provides a solid fuel combustion device for facilitating the maintenance of the solid fuel combustion device, reducing the downtime of the solid fuel combustion device due to the maintenance work, to improve the operation rate and productivity of the solid fuel combustion device. It aims to provide.

In addition, an object of the present invention is to provide a solid fuel combustion device that can effectively recover the heat generated during the combustion of the solid fuel.

According to the embodiments of the present invention for achieving the above object of the present invention, a solid fuel combustion device is a combustion furnace that provides a combustion space, accommodated in the combustion furnace to receive and combust the solid fuel in a floating state A plurality of grate, provided in the grate and the water cooling unit for cooling the grate by circulating a cooling water, supplying air to the grate to space the solid fuel over the grate a certain distance and to maintain the state of the solid fuel floating And a heat recovery unit provided to surround the floating unit and the combustion furnace, wherein the heat recovery unit is connected to the water cooling unit to recover the heat of the combustion furnace by circulating cooling water introduced from the water cooling unit to the outside of the combustion furnace. (water jacket) and air is filled outside the water jacket to the heat recovery portion An outer jacket and an air jacket are provided at a predetermined distance from each other to insulate the water jacket from the external environment, thereby transferring heat recovered by the water in the water jacket to an external boiler.

In an embodiment, the water cooling units of the plurality of grates are connected to each other so that the cooling water cooling one grate flows into the next grate.

In an embodiment, the floating unit is provided to spray air from the surface of the grate to the top and is provided in the plurality of nozzles and densely arranged on the grate surface and communicated with the plurality of nozzles in the air to the nozzle It includes a blowing line for providing a, and floating the solid fuel over a certain distance from the grate surface.

In an embodiment, a plurality of grate is disposed in the form of a staircase inside the combustion furnace, the floating unit is floated to be transferred to the next grate in the state in which the solid fuel is injured on the grate surface. Here, a moving grate for pushing and moving solid fuel in a state of floating on the surface of the grate above the grate and a driving cylinder coupled to the grate to transfer the driving force for moving the grate. In addition, a transfer part is provided at one side of the moving grate so that the moving grate is movable, and the transfer part is in contact with the guide rail provided at the side of the moving grate and the guide rail and supports the moving grate to move the grate. It is provided.

According to the present invention, first, since the floating unit is provided to inflate solid fuel on the surface of the grate by supplying air to the grate, the solid fuel is combusted in a state in which a predetermined height rises above the grate, so that the solid fuels aggregate and the solid fuel is grate To prevent it from adhering to In particular, the solid fuel is continuously injured on the grate and, when transported to the next grate, is also injured on the grate.

In addition, it is possible to reduce the number and time of maintenance work for removing the stuck solid fuel can increase the operating rate and productivity of the solid fuel combustion device.

Second, the air supplied to float the solid fuel effectively mixes and supplies the air between the solid fuels, and the solid fuel is agitated by the air, so that the combustion efficiency is improved, it can be completely burned, and the amount of ash remaining after the combustion is increased. Can be effectively reduced.

In addition, as the combustion efficiency of the solid fuel is improved, there is an effect of reducing the consumption of the solid fuel and reducing the cost.

Third, in order to float the solid fuel, the air to be supplied has a relatively low temperature, so the lower part of the solid fuel is in contact with the air can be condensed due to the temperature difference. Has an additional effect of preventing the grate from adhering to the grate even if it is in contact with the grate surface.

Fourth, by circulating the cooling water discharged from the water cooling unit for cooling the grate to the outside of the combustion furnace, heat is recovered twice in the grate and the combustion furnace, it is possible to improve the heat recovery efficiency.

In addition, by allowing the cooling water to circulate the plurality of grate sequentially, the heat recovery efficiency from the grate can be improved.

In addition, by providing an air jacket outside the water jacket, the heat recovery efficiency in the waste heat recovery unit can be improved.

Fifth, since the cooling water passes through the grate sequentially, the temperature of the cooling water flowing into the grate may be supplied to a predetermined temperature, and the grate surface temperature and the temperature of the air injected from the floating unit may be maintained at a predetermined temperature. This prevents the temperature around the solid fuel from dropping, thereby improving combustion efficiency.

Although the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, the present invention is not limited or restricted by the embodiments.

Hereinafter, a solid fuel combustion apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 9. For reference, Figure 1 is a longitudinal cross-sectional view of a solid fuel combustion apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the solid fuel combustion device 10 includes a combustion furnace 11, a grate 20, and a driving unit 30.

The combustion furnace 11 is a space in which the solid fuel is accommodated and burned, and recovers the waste heat generated when the solid fuel is burned to form hot water or hot air. The hot water and hot air thus formed are transferred to a home or factory to supply heat. The waste heat recovery in the combustion furnace 11 will be described later with reference to FIGS. 7 to 9.

The fuel supply unit 15 is provided above the combustion furnace 11. The fuel supply unit 15 automatically supplies a predetermined amount of solid fuel to the grate 20 at predetermined time intervals. For example, the fuel supply unit 15 is an automatic balance and may be provided between the storage tank (not shown) in which the solid fuel provided on the combustion furnace 11 and the combustion furnace 11 are stored.

The grate 20 is provided in the combustion furnace 11 so that the solid fuel is burned on the grate 20 in a state where the solid fuel is accommodated. Here, a plurality of grate 20 is provided in the combustion furnace 11, in particular, in the fuel supply unit 15 so that the plurality of grate 20 can sequentially burn a plurality of times the solid fuel Supplied solid fuel is arranged in a stepped form formed to be inclined from the top to the bottom to sequentially move to the next grate (20).

For example, the upper grate 20 and the lower grate 20 are provided spaced apart by a predetermined interval up and down, and at the same time, the lower grate 20 in the upper grate 20 is the combustion furnace 11 It is arrange | positioned in the position shifted a predetermined distance along the longitudinal direction of ().

The drive unit 30 is provided to move the solid fuel contained in the grate 20 to the next grate 20.

In detail, the driving unit 30 is provided to be movable in the upper portion adjacent to the grate 20 to move the solid fuel contained in the grate 20 to the next grate 20 and the grate It is coupled to the moving grate 31 includes a drive cylinder 32 for transmitting a driving force to the grate 20.

The driving unit 30 is provided with the driving cylinder 32 on one side of the combustion furnace 11, the moving grating 31 as the driving cylinder 32 is stretched in the direction of the combustion furnace 11 ) Is moved above the grate 20. And the solid fuel in the state injured on the grate 20 by the movement of the moving grate 31 is pushed to the next grate 20 to move.

For example, the four grate 20 is provided in the combustion furnace 11, the solid fuel is burned while being sequentially transferred from the grate 20 of the upper to the grate 20 of the lower. In addition, the ash of the solid fuel that has been burned in the last grate 20 is discharged to the outside of the combustion furnace 11 through the discharge portion 55 provided at the bottom of the combustion furnace 11.

6 is a plan view showing a moving grate 31 according to an embodiment of the present invention. 1 and 6, the moving grate 31 is provided to be movable along the longitudinal direction of the grate 20 in the combustion furnace 11, corresponding to the upper portion of the grate 20 Take form.

In addition, one side of the moving grate 31 is provided with a transfer unit 310 for the movement of the moving grate (31). The transfer part 310 is composed of a guide rail 311 and a transfer roller 312 provided on both sides of the moving grate 31.

The guide rails 311 are provided along both sides of the moving grate 31 so that the moving grate 31 can move along the length direction.

The transfer roller 312 is in contact with the guide rail 311 to support the movement of the moving grate 31 in accordance with the operation of the drive unit 30.

However, the present invention is not limited thereto, and the position and shape of the guide rail 311 and the conveying roller 312 may be substantially varied according to the moving direction of the moving grate 31. In addition, the transfer means of the moving grate 31 may have a variety of forms in addition to the guide rail 311 and the roller 312.

The grate 20 is provided with a floating unit 220 for floating the solid fuel to a predetermined height from the surface of the grate 20, for protecting the grate 20 from the heat generated during the combustion of the solid fuel The water cooling unit 250 and a heat resistant member (not shown) may be provided.

Hereinafter, the grate 20 will be described in detail with reference to FIGS. 2 to 5. For reference, FIG. 2 is a side view illustrating an example of the grate 20 in the solid fuel combustion device 10 of FIG. 1, and FIG. 3 is a longitudinal cross-sectional view of the grate 20 of FIG. 2. 4 is a plan view illustrating the floating unit 210 in the grate 20 of FIG. 2, and FIG. 5 is a plan view illustrating the water cooling unit 250 in the grate 20 of FIG. 2.

2, the grate 20 has a form capable of receiving solid fuel and combusting. For example, the grate 20 has a plate shape having a predetermined area, and has a predetermined volume so that the floating unit 210 and the water cooling unit 250 may be provided.

In addition, an air supply part 41 for supplying air to the floating unit 220 is connected to one side of the grate 20, and a cooling water supply part 42 for supplying cooling water to the water cooling part 250 is connected. . The moving grate 31 is coupled to the upper part of the grate 20 to move the solid fuel combusted from the upper part of the grate 20.

As shown in FIG. 3, the floating unit 210 injects solid fuel into the upper portion of the grate 20 by spraying air of a predetermined pressure from the surface of the grate 20 to the upper portion. The water cooling unit 250 is provided to communicate with the inside of the grate 20 to protect the grate 20 from the heat of combustion of the solid fuel by circulating the coolant into the grate 20. In addition, the water cooling unit 250 serves to generate hot water by absorbing heat generated when the solid fuel is burned as well as protecting the grate 20.

The floating unit 220 is composed of a nozzle unit 215 and a blowing line 216, the air supply portion 41 is connected to the blowing line 216.

Referring to FIG. 4, the nozzle unit 215 has a plurality of nozzle parts 215 dense on the grate 20 so as to inject air to the upper portion of the grate 20 to raise a solid fuel to a predetermined height. It is provided. For example, the nozzle unit 215 is arranged on the upper surface of the grate 20, a plurality of nozzles 215 are densely arranged at regular intervals.

The air supply part 41 is provided to communicate with the inside of the grate 20 to provide a high pressure air into the grate 20, the air introduced into the grate 20 is the nozzle unit 215 It is injected through the grate 20 at a predetermined pressure through.

One side of the grate 20 is in communication with the air supply unit 41 is provided with an air inlet 211 for supplying air into the grate 20. For example, the air inlet 211 is provided on one side of the grate 20, and at least one air inlet 211 is provided to uniformly inject air into the grate 20.

Alternatively, a blowing line 216 may be provided in the grate 20 to communicate with the air inlet 211 to guide air to the nozzle unit 215. For example, the blower line 216 communicates with a plurality of nozzle units 215, and corresponds to one row of the nozzle units 215 disposed along the longitudinal direction of the grate 20, so as to correspond to the corresponding column image. It may be formed to communicate with the nozzle portion 215 disposed in the. Alternatively, the grate 20 may be formed in one or two spaces.

Although not shown, a heat resistant member (not shown) may be provided as a means for protecting the grate 20 and the nozzle unit 215 from combustion heat of solid fuel.

In the state where the solid fuel is accommodated on the grate 20, when air is injected through the floating unit 220, the solid fuel is the surface of the grate 20 due to the pressure of the air injected through the floating unit 220 Combustion takes place in an injured state. In particular, the floating unit 210 is pressure enough to maintain a state of injury on the surface of the grate 20 until the solid fuel is supplied to the grate 20 and then moved to the next grate 20 Inject air. Therefore, the floating unit 210 may prevent the solid fuel from agglomerating or the solid fuel adhering to the grate 20 or the nozzle unit 215 during the combustion of the solid fuel. In addition, since the air is smoothly supplied between the solid fuel and the solid fuel is agitated by the air, the flotation unit 210 may improve the combustion efficiency of the solid fuel and allow complete combustion.

According to this embodiment, since the solid fuel that is completely burned increases, the amount of heat that can be generated by burning the same solid fuel increases, and the cost can be reduced. In addition, since the amount of waste after combustion, such as solid fuel deposits and ash, is significantly reduced, the maintenance of the solid fuel combustion device 10 is easy, and the maintenance interval of maintenance can be reduced. It prevents a decrease in utilization rate and productivity.

Referring to FIG. 5, the water cooling unit 250 may protect the grate 20 and the floating unit 220 from the heat of combustion of the solid fuel so that heat exchange occurs between the coolant and the grate 20. It forms a flow path for flowing.

For example, a predetermined flow path may be formed along the inner surface of the grate 20, and the water cooling part 250 may form an exterior of the grate 20. 216 is provided to surround. One side of the water cooling unit 250 is connected to a cooling water supply unit 42 for supplying cooling water into the water cooling unit 250.

The water cooling unit 250 is formed with a flow path so as to maximize the flow length of the cooling water passing through the grate 20. For example, a partition wall 255 is formed in the water cooling unit 250 to form a flow path such that the coolant repeatedly flows a plurality of times along the longitudinal direction of the grate 20. In addition, the coolant flowing from one side of the water cooling unit 250 flows along the water cooling unit 250 to generate heat exchange with the surface of the grate 20, and then the hot water flows out through the other side of the water cooling unit 250. .

The hot water flowing out of the water cooling unit 250 recovers heat generated in the combustion furnace 11 while flowing in and circulating out of the combustion furnace 11, and the hot water flowing out of the water cooling unit 250 is After recovering heat once again in the waste heat recovery unit 110 provided in the combustion furnace 11 is provided to an external boiler (not shown), the boiler serves to provide the provided hot water to the home or factory.

Hereinafter, referring to FIGS. 7 to 9, the waste heat recovery unit 110 according to an embodiment of the present invention will be described in detail. For reference, FIG. 7 is a plan view illustrating the combustion furnace 11 and the waste heat recovery unit 110 in the solid fuel combustion device 10 of FIG. 1, and FIG. 8 is a longitudinal cross-sectional view of the combustion furnace 11 of FIG. 7. to be. 9 is a block diagram for explaining the waste heat recovery operation of the solid fuel combustion apparatus according to an embodiment of the present invention.

Referring to FIGS. 7 and 8, the waste heat recovery unit 110 is provided in the combustion furnace 11 to circulate hot water introduced from the water cooling unit 250 to the outside of the combustion furnace 11. The waste heat in (11) is recovered.

In detail, the waste heat recovery unit 110 is a water jacket 111 provided outside the combustion furnace 11. The water jacket 111 is provided to surround the combustion furnace 11 and is heated by heat generated during the combustion of the solid fuel in the combustion furnace 11 while water flows into the water jacket 111. . The hot water heated by the water jacket 111 is supplied to a home or a factory.

In particular, according to the present embodiment, the waste heat recovery unit 110 forms the water jacket 111 to be connected to the water cooling unit 250 so that the heated hot water is cooled while the grate 20 is cooled. It is introduced into the 111, it is formed to be heated and discharged while passing through the water jacket (111). Therefore, according to the present embodiment, since heat is recovered first while passing through the grate 20, and heat is recovered while passing through the water jacket 111, heat is recovered twice, thereby improving heat recovery efficiency.

In addition, the water jacket 111 serves to protect the combustion furnace 11 from combustion heat by cooling the combustion furnace 11.

The outer side of the water jacket 111 may be provided with an air jacket (air jacket) (112) for protecting the water jacket (111). The air jacket 112 is spaced apart from the outer wall of the heat recovery part 110 and the water jacket 111 by a predetermined distance and filled with air in the spaced space, and insulates the water jacket 111 from the external environment. .

By providing the air jacket 112, the air filled in the air jacket 112 serves as a heat insulator separating the water jacket 111 from the outside and maintains the temperature of the hot water flowing inside the water jacket 111. It will act as a thermal insulation material. Therefore, by providing the air jacket 112, there is an advantage of increasing the heat recovery efficiency through the water jacket 111 and maintaining the temperature of hot water heated in the water jacket 111.

In addition, a fire brick may be provided on the outside of the air jacket 112.

On the other hand, the grate 20 is configured so that the water cooling unit 250 is connected to each other, the water jacket 111 after the water supplied from the cooling water supply unit 42 passes through the plurality of grate 20 in sequence Inflow). Water is heated by heat exchange with the grate 20 while passing through the plurality of grate 20.

Referring to the operation of the waste heat recovery unit 110 as follows.

First, cooling water is supplied from the cooling water supply part 42 to the water cooling part 250. While circulating along the water cooling unit 250, the cooling water is heated while cooling the grate 20 (the first grate 21 for convenience), and then the next grate 20 (the second grate 22 for convenience). Flows into.

Although only two grates 20 are illustrated in FIG. 9, such as the first grate 21 and the second grate 22, the present invention is not limited thereto, and the first and second grates 21 and 22 may be used. Denotes a plurality of grate 20, the water is circulated for substantially all the grate 20 provided in the combustion furnace (11).

The water discharged by being heated to a predetermined temperature in the second grate 22 is introduced into the water jacket 111 and heat-exchanged with the inside of the combustion furnace 11 while flowing out of the combustion furnace 11. It is heated to a temperature and flows into a waste heat recovery boiler (not shown) for supplying hot water to a home or factory.

Here, the cooling water flowing from the cooling water supply part 42 into the first grate 21 has a temperature of about room temperature, whereas the water flowing into the second grating 22 from the first grating 21 is Since is heated to a predetermined temperature it can be prevented that the temperature difference between the surface temperature of the second grate 22 and the internal temperature of the combustion furnace 11 is too large.

In addition, since the water cooling unit 250 surrounds the floating unit 210, the temperature of the air injected from the floating unit 210 is affected by the temperature of the water cooling unit 250. When the temperature of the air injected from the flotation unit 210 is too low, the combustion efficiency may be lowered by lowering the temperature around the solid fuel.

However, by circulating the water heated to a predetermined temperature of the water cooling unit 250 as in this embodiment, there is an advantage that can maintain the temperature of the air injected from the floating unit 210 above a certain temperature. In addition, since water is heated while passing through the first and second grate 21, 22, there is an advantage that a separate device for separately supplying water and air is not required.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a side cross-sectional view for explaining a solid fuel combustion device according to an embodiment of the present invention;

Figure 2 is a side view showing an example of the grate in the solid fuel combustion apparatus of Figure 1;

3 is a longitudinal sectional view of the grate of FIG. 2;

Figure 4 is a plan view for explaining the injury unit in the grate of Figure 2;

5 is a plan view for explaining a water cooling unit of the grate of FIG.

6 is a plan view illustrating an example of a moving grate for transporting solid fuel in the solid fuel combustion device of FIG. 1;

7 is a plan view of the solid fuel combustion device of FIG.

8 is a longitudinal sectional view for explaining an example of the waste heat recovery unit in the combustion furnace of FIG.

9 is a block diagram for explaining the operation of the waste heat recovery unit of the solid fuel combustion apparatus according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: solid fuel combustion device 11: combustion furnace

15: fuel supply 20, 21, 22: grate

30: drive unit 31: moving grate

32: drive cylinder 41: air supply

42: coolant supply 51: burner

55: discharge unit 110: waste heat recovery unit

111: water jacket 112: air jacket

210: floating unit 211: air inlet

215: nozzle unit 216: blowing line

250: water cooling part 251: inlet

252: outlet 255: diaphragm

310: transfer unit 311: guide rail

312: feed roller

Claims (6)

A combustion furnace providing a combustion space; A plurality of grate accommodated in the combustion furnace to receive and combust the solid fuel in a state of floating; A water cooling unit provided in the grate to cool the grate by circulating cooling water; A floating unit for supplying air to the grate to space the solid fuel over the grate a predetermined distance and to maintain the solid fuel in an injured state; And And a heat recovery unit provided to surround the combustion furnace. A water jacket connected to the water cooling unit to recover the heat of the combustion furnace by circulating the cooling water introduced from the water cooling unit to the outside of the combustion furnace; The air jacket is filled to the outside of the water jacket so that the outer wall of the heat recovery unit and the water jacket are separated by a predetermined distance to provide an air jacket to insulate the water jacket from the external environment. Solid fuel combustion device, characterized in that for transferring the heat recovered by the water of the water jacket to an external boiler. The method of claim 1, The water cooling unit of the plurality of grate is connected to each other solid fuel combustion apparatus, characterized in that the cooling water for cooling one grate flows into the next grate. The method of claim 1, The injury unit A plurality of nozzles provided to inject air from the surface of the grate to the top and are densely disposed on the grate surface; And A blowing line provided inside the grate to communicate with the plurality of nozzles to provide air to the nozzles; Solid fuel combustion apparatus comprising a. The method of claim 1, A plurality of grate is disposed in the combustion furnace in the form of a staircase, and the floating unit is a solid fuel combustion device, characterized in that to rise to be transported to the next grate in the state in which the solid fuel is injured on the surface of the grate. The method of claim 4, wherein A mobile grate for pushing and moving solid fuel in an injured state on the surface of the grate above the grate and a driving cylinder coupled to the grate for transmitting the driving force for moving the grate are further provided. Solid fuel combustion device. The method of claim 5, One side of the moving grate is provided with a transfer unit to move the moving grate, The conveying unit comprises a guide rail provided on the side of the moving grate and the roller in contact with the guide rail to support the moving grate to be movable.

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