WO2003100321A1 - Movable stoker - Google Patents

Abstract

A ventilation passage formed to penetrate between the upper and lower surfaces of a movable grating and a fixed grating comprises a rear ventilation passage disposed in the rear of the movable and fixed gratings, and a front ventilation passage disposed in front of the movable and fixed gratings. At least the upper end side of the rear ventilation passage is formed in the direction perpendicular to the upper surface and at least the upper end side of the front ventilation passage is formed to incline forward with respect to the upper surface. Supply air can thereby touch a matter being processed located in the rear of the movable and fixed gratings while preventing the supply air from flowing through and preventing a mass of the matter being processed from being caught by the movable and fixed gratings, and cooling/protective effect of the supply air is enhanced in the rear of the movable and fixed gratings.

Description

 Description Movable grate Technical field

 The present invention relates to a movable fire grate used for a clinker cooling cooler in a cement burning facility or an incinerator in a garbage incineration facility, for example. Background art

 Conventionally, as a movable grate used for a clinker cooling cooler, a movable grate plate and a fixed grid plate each having an air passage penetrating between upper and lower surfaces, and a fixed grid plate having a front portion adjacent to the front thereof. Alternatively, the workpiece can be pressed forward by reciprocating the movable grid plate back and forth so that it can be pressed forward and the air supplied from below is ventilated. A movable grate capable of being cooled by contacting an object to be processed through a path, wherein the ventilation path is penetrated only at the front of the lattice plate at a right angle to the upper surface of the lattice plate. Also, it is known that only the front part of the lattice plate is penetrated by being inclined with respect to the upper surface of the lattice plate (Japanese Patent Laid-Open Publication No. Hei 9-188582).

 Although not a movable grate, each grate plate is a fixed grate with all grate plates fixed, and each grate plate is box-shaped with air supplied inside, and the top plate is inclined with respect to the top surface. It is also known that a ventilation path is formed by performing the process (Japanese Patent Publication No. 6-33551).

However, in the above-mentioned movable grate, when the air passage penetrates at right angles to the upper surface of the grate plate, the air blown out there rises upward, so that the material layer to be treated placed on the grate plate is removed. There is a problem that it is easy to break through through thin parts. When this stairwell occurs, The amount of air supplied to the thick part of the treatment layer decreases, and overall cooling efficiency decreases. In addition, a part of the air heated by cooling the workpiece is reused as fuel combustion air. Increasing the supply will reduce the temperature of the recycled air and reduce the fuel combustion efficiency.

 On the other hand, a structure in which the ventilation path is penetrated at an angle to the upper surface of the lattice plate has an advantage that the Coanda effect in which air is blown out along the upper surface of the lattice plate is easily obtained. Due to the Coanda effect, when air is blown out from the ventilation path along the upper surface of the grid plate, not only the above-mentioned blow-through does not easily occur, but also the grid plate is easily cooled, and the protection effect by cooling the grid plate is enhanced. Further, it is possible to suppress the object to be dropped from the ventilation path.

 On the other hand, since the ventilation path in the conventional movable grate is formed only in the front part of the grid plate, it does not come into contact with air while the object remains at the rear part of the grid plate. There is a problem of poor cooling efficiency. In addition, at the rear part of the grid plate without an air passage, there is no cooling protection effect of the grid plate due to the passage of air through the air passage, and there is a problem that the grid plate is easily overheated and easily damaged.

 In order to solve the above problem while preventing the blow-by, it is conceivable to form the inclined air passage not only at the front part of the lattice plate but also at the rear part.

 However, as shown in Fig. 6, the inclined ventilation path 2 has a large opening on the upper surface, and the lump 3 of the object to be fitted is fitted therein. When the movable lattice plate 1a is retracted (when moving forward) In the meantime, the mass 3 of the object to be processed is sandwiched in the gap between the fixed grid plate 1 b adjacent to the rear (front), causing meshing, and the two grid plates la and 1 b are easily damaged. There is.

With the conventional fixed grate, there is no movement of the grate plate. The inclined ventilation passages are formed at both the front and rear of the grid plate without worrying about the interlock, thereby preventing blow-through and improving the overall cooling protection effect.

 However, since the fixed grate does not have the function of transporting the processed object by moving the grid plate, there is a problem that when a large lump is supplied, it is seized and the transfer of the processed object is easily hindered. : In addition, in general, a movable grate that is excellent in the function of transporting an object to be treated is often used, and there is a problem that it requires a large amount of cost to convert it into the fixed grate.

 The present invention has been made in view of the above-described problems, and has a function of transporting an object to be processed, and furthermore, a movable grate that is widely used by a blow-through of supply air and pinching of a lump of the object to be processed. To prevent contact between the workpiece and the supply air at the rear part of the movable and fixed grid plates while suppressing interference, and to improve the cooling protection effect of the movable and fixed grid plate rear parts by the supplied air. Its purpose is to: Disclosure of the invention

The movable grate of the present invention further includes a ventilation path formed through the upper and lower surfaces of the movable lattice plate and the fixed lattice plate, a rear ventilation path provided at a rear portion of the movable and fixed lattice plates, There are two types of front air passages provided at the front of the movable and fixed grid plates. At least the upper end of the rear air passage is formed at right angles to the upper surface, and at least the upper end of the front air passage Is formed to be inclined forward with respect to the upper surface. Further, according to the present invention, the movable and fixed grids are suppressed while suppressing the supply air blow-through and the interlocking of the lump of the object to be processed between the movable grid plate and the fixed grid plate by having the above-mentioned features. The contact between the workpiece and the supply air at the rear of the plate can be made possible, and the cooling protection effect of the movable and fixed grid plate rear by the supply air can be enhanced. It can be. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a perspective view showing a schematic configuration of a movable grate according to the present invention. FIG. 2 is a partially sectional perspective view showing an example of a movable and fixed grid plate used in the movable grate of FIG. FIG. 3 is an explanatory diagram of the operation of the present invention. FIG. 4 is another explanatory view of the operation of the present invention. FIG. 5 is a schematic diagram showing an example of a cooling power cooler provided with a movable grate according to the present invention. FIG. 6 is an explanatory diagram of the problem of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, the present invention will be described in detail.

 As shown in FIG. 1, the movable and fixed grid plates 1a and 1b are plate-like bodies each having an air passage 2 penetrating between upper and lower surfaces, and are arranged in the front-rear direction. The movable lattice plate la is attached to the movable frame 4 located below, and is reciprocally movable with the movable frame 4 in the front-rear direction. The fixed grid plate lb is attached to, for example, the side wall of a clinker cooler or the side wall of an incinerator, and is fixed at a fixed position.

 The movable lattice plate 1a and the fixed lattice plate 1b are provided alternately in the front-to-rear direction with their front portions superimposed on the rear portion of the fixed lattice plate 1b or the movable lattice plate 1a adjacent to the front. . The movable and fixed grid plates l a, lb are each slightly inclined backward, and are arranged such that the lines connecting the front ends of the movable and fixed grid plates l a, 1 b are substantially straight.

The movable frame 4 is a frame-shaped structure having wheels 6 supported on guide rails 5, and reciprocates back and forth while rolling the wheels 6 along the guide rails 5. Has become. This guide The movable frame 4 has an inclination corresponding to the inclination of the movable and fixed lattice plates 1a and lb.When the movable frame 4 reciprocates in a slightly diagonal front-back direction along the inclination of the guide rail 5, the movable lattice The plate la reciprocates in the front-back direction slightly obliquely within a range that can partially overlap the fixed grid plate 1b. The reciprocating movement of the movable frame 4 can be performed by, for example, a crank mechanism or a hydraulic cylinder mechanism.

 The movable and fixed lattice plates la and lb are for placing and sequentially transporting the objects to be processed. When the movable lattice plate 1a is reciprocated forward and backward as described above, the movable lattice plates During forward movement of 1a, the front end of the movable grid presses the workpiece forward, whereby the workpiece can be transported. Further, when the movable lattice plate 1a is retracted, the front end of the fixed lattice plate 1b locks the object to be processed, and it is possible to prevent the object from being retracted together with the movable lattice plate 1a. At the same time as the transport of the workpiece, air is supplied from below and is brought into contact with the workpiece via the air passage 2 to cool the workpiece, promote combustion, etc. As shown in FIG. 2, the ventilation path 2 formed in the fixed lattice plate 1 b includes a rear ventilation path 2 a formed in a rear part, and a front ventilation path 2 b formed in a front part. It is composed of

 The rear ventilation passage 2a in this example is a vertical slit penetrating at right angles to the upper surface between the upper and lower surfaces of the movable or fixed lattice plates 1a and 1b where the rear ventilation passage 2a is formed. ing. In addition, the lower end of the front ventilation path 2b in this example is formed at right angles to the upper surfaces of the movable or fixed grid plates la and 1b on which the front ventilation path 2b is formed. At the same time, the upper end side is a rectangular slit (bent slit) which is formed to be inclined forward with respect to the upper surface of the movable or fixed grid plate 1a, 1b in which the front ventilation path 2b is formed. .

The rear air passage 2a and the front air passage 2b in the present invention are It can be a hole instead of a hole.However, it is easy for air to uniformly contact the workpiece on the movable grid plate la and the fixed grid plate 1b in the width direction. Preferably, the slit is a horizontally long slit formed in a direction perpendicular to the plane.

 The rear ventilation path 2a in the present invention may be bent or inclined at the lower end side as long as at least the upper end side is formed at a right angle to the upper surface, but since it is easy to form and the air resistance is reduced, It is preferable that the whole is formed at right angles to the upper surface. Further, the front vent 2b can be formed diagonally as a whole, but as the inclination increases, the number of front vents 2b that can be formed decreases, so in order to reduce this, Preferably, only the upper end is inclined, and the lower end is formed at right angles to the upper surface.

 The rear ventilation path 2a and the front ventilation path 2b can have the same slit width or hole diameter over the entire length, but the upper end slit is designed to make it easier to drop and discharge when the workpiece enters. It is preferable that the slit width or the hole diameter on the lower end side be larger than the width or the hole diameter.

Assuming that the rear ventilation channel 2a and the front ventilation channel 2b are as described above, as shown in Fig. 3, the rear ventilation channel 2a and the front ventilation channel have a slit width or hole diameter that facilitates obtaining the required airflow. road 2 when expressed by a and b, respectively, can be smaller fence from the upper surface opening width W ₂ of the upper opening width of the rear vent passage 2 a front air passage 2 b. Therefore, for example, even if the lump 3 of the object to be processed is put on the upper opening of the rear ventilation passage 2a of the movable lattice la (fixed lattice portion 1b), it fits in the small opening of the rear ventilation passage 2a. As shown in Fig. 4, when the movable grid plate la is retracted (forward), the movable grid plate la is pushed backward and forward (forward), and is pressed against the front end face of the adjacent fixed grid plate 1b (movable grid plate 1a). It can be prevented from being pushed out and entering the gap between the movable grid plate la and the fixed grid plate 1b and causing meshing. In the present invention, a rear ventilation passage 2a is formed at the rear of the movable lattice portion 1a and the fixed lattice portion 1b, and the air blown out from the rear ventilation passage 2a can be brought into contact with the workpiece. Processing efficiency is improved. Further, the rear can be cooled by the air passing through the rear vent passage 2 a, the way _c can prevent the back of overheating, the rear vent passage 2 a is at a right angle at least upper side with respect to the upper surface formed The air passing there rises directly and is easily blown. However, the rear part of the movable lattice plate 1a and the fixed lattice plate 1b is covered with the front part of the fixed lattice plate 1b or the movable lattice plate 1a adjacent to the rear as the movable lattice plate 1a reciprocates. In addition, since the object to be processed deposited thereon is reliably moved, blow-through is substantially unlikely to occur, and even if a blow-through occurs, its influence can be minimized. Further, in order to reliably obtain such an effect, the rear ventilation path 2a is movable with the reciprocating movement of the movable grid plate 1a even at the rear of the movable and fixed grid plates 1a and lb. It is preferable to provide it only in the region where the grid plate 1a and the fixed grid plate 1b overlap.

 On the other hand, at least the upper end side of the front ventilation path 2b is inclined forward with respect to the upper surface, so that air can be blown out along the upper surface by the Coanda effect, and the air is efficiently treated while suppressing blow-through. Air can be brought into contact with the physical material, and the front part can be cooled to prevent overheating. The front ventilation passage 2b is designed to easily obtain the Coanda effect without being greatly restricted by the number of formed passages. At least the inclination angle S (see FIG. 3) with respect to the upper surface on the upper end side should be 15 to 60 degrees. Preferably, it is 20 to 30 degrees. Further, at least the upper end side of the front ventilation path 2b is inclined forward with respect to the upper surface, and the air blows forward, so that the workpiece can be transported by the flow of the air.

The rear air passage 2a in the present invention is, for example, as shown in FIG. When the movable lattice plate 1a reciprocates, the rear part of the movable lattice plate 1a (fixed lattice plate 1b) overlaps most of the front part of the fixed lattice plate lb (movable lattice plate la) and is fixed. It also serves to supply air to the front ventilation passage 2b formed in front of the grid lb (movable grid 1a). At this time, if the gap between the lower surface of the fixed lattice plate lb (movable lattice plate la) and the upper surface of the movable lattice plate la (fixed lattice plate lb) is small, the front air passage 2b and the rear air passage 2a It is difficult to supply air to the front ventilation path 2b due to the displacement of the position. Therefore, the edges 7 are respectively projected downward at least at the front ends of the lower surfaces of the movable lattice plate 1a and the fixed lattice plate 1b, and the lower surface of the fixed lattice plate lb (movable lattice plate la) and the movable lattice plate It is preferable to ensure a gap between the upper surface of la (fixed grid plate lb) and the space that facilitates the flow of air. The edge 7 may be provided on the lower surface periphery of the movable grid plate 1a and the fixed grid plate 1b.

 The thickness of the movable grid plate 1a and the fixed grid plate 1b is not particularly limited as long as the required strength can be obtained even if the rear ventilation path 2 and the front ventilation path 2a are formed. When used for a cooling cooler and made of iron, the thickness is generally preferably 10 mm or more, particularly preferably about 15 to 70 mm.

 Next, an example of a clean cooling cooler provided with the movable grate according to the present invention will be described with reference to FIG.

 In the figure, reference numeral A denotes a movable grate according to the present invention. On this movable grate A, a high-temperature burner 9 fired from a kiln 8 is discharged.

 The lower part of the movable grate A is partitioned into a plurality of air chambers 10 arranged in series along the conveying direction of the cleaning force 9, and each air chamber 10 has an air supply port 1 opened to the side. The air is sent from the fan 11 via the pump 2.

Assuming the above-mentioned clean power cooler, above the movable grate A The clinker 9 can be efficiently cooled by the air supplied from below while being transported, and the movable grid plate 1a and the fixed grid plate 1b can be easily prevented from being damaged by the heat of the clinking force 9. Become. Industrial applicability

 First, the movable grate of the present invention includes a rear ventilation path having at least an upper end formed in a direction perpendicular to the upper surface at a rear portion of the movable and fixed lattice plates, and the rear ventilation path has at least an upper end. Since the width of the upper surface opening can be made smaller than that of the front air passage formed so that the side is inclined forward with respect to the upper surface, a large lump of the workpiece does not fit into the upper surface opening. Therefore, a large lump of the workpiece is fitted into the opening on the upper surface, and when the movable grid plate is retracted (forward), the workpiece is inserted into a gap between the movable grid plate and the fixed grid plate adjacent to the rear (front). It is possible to prevent the two grid plates from being damaged due to the interlocking of the lumps, which results in less trouble.

 Second, since the movable grate of the present invention has not only the front ventilation path but also the rear ventilation path, the air flowing through the rear ventilation path can protect the rear part from cooling. In addition, the rear portions of the movable grid plate and the fixed grid plate are covered with the front portion of the fixed grid plate or the movable grid plate adjacent to the rear with the reciprocating movement of the movable grid plate, and are covered on the movable grid plate. Since the movement of the processed material is surely performed, blow-through is substantially unlikely to occur, and even if a blow-by occurs, its influence can be minimized. Therefore, it is possible to effectively prevent a decrease in the temperature of the recycle air when used in, for example, a clean cooling cooler, thereby achieving high cooling efficiency and maintaining a high temperature of the recycle air.

Thirdly, the movable grate of the present invention has a front portion having at least an upper end side inclined forward with respect to the upper surface at a front portion of a movable and fixed grid plate on which an object to be processed is always placed. Because it has a ventilation path, Coanda It is possible to prevent blow-through due to the effect and to achieve good cooling protection of the front part.

 Fourth, the movable grate according to the present invention is not only unlike a normal movable grate, but is not only unlikely to have large lumps like a fixed grate, but also has a basic structure similar to that of a commonly used movable grate. Therefore, the existing movable grate can be easily and inexpensively converted into the movable grate of the present invention.

Claims

The scope of the claims 1. A movable grid plate and a fixed grid plate each having an air passage penetrating between the upper and lower surfaces are stacked with their front portions on the front of the fixed grid plate or the movable grid plate that is adjacent to the front. The movable grid plate reciprocates in the front-rear direction and presses the workpiece forward, and the air supplied from below contacts the workpiece via the ventilation path. On the grate,  The air passage comprises a rear air passage provided at a rear portion of the movable and fixed grid plate, and a front air passage provided at a front portion of the movable and fixed grid plate, and at least the rear air passage. A movable grate, wherein an upper end is formed in a direction perpendicular to the upper surface, and at least an upper end of the front ventilation passage is formed to be inclined forward with respect to the upper surface.  2 · The rear air passage extends perpendicularly to the upper surface between the upper and lower surfaces of the movable or fixed grid plate where the rear air passage is formed, and the lower end of the front air passage is connected to the front air passage. Are formed at right angles to the upper surface of the movable or fixed lattice plate on which the front air passage is formed, and the upper end side of the front air passage is formed with respect to the upper surface of the movable or fixed lattice plate on which the front air passage is formed. The movable grate according to claim 1, wherein the movable grate is formed so as to be inclined forward.  3. The rear ventilation path and the front ventilation path are slits formed in a direction orthogonal to the front-rear direction, and each slit width is wider on the lower surface side than on the upper surface side. The movable grate according to paragraph 1.  4. The movable grate according to claim 1, wherein the edges protrude downward at least at the front end portions of the lower surfaces of the movable and fixed grate plates. 5. The rear air passage is moved by the movable grid plate The movable grate according to any one of claims 1 to 4, wherein the movable grate and the fixed grate plate are formed in an overlapping region.