TWI460145B - A cooling unit and a cooler device having the same - Google Patents

Description

Cooling unit and cooler device therewith

The present invention relates to a cooling unit for a cooler device that cools a high-temperature granular material, for example, a granular cement clinker while being conveyed.

In the cement plant equipment, there is provided a cooler that transports the high-temperature cement clinker produced by preheating, calcining, and firing while cooling, and is, for example, a cooler of Patent Document 1. The cooler has a plurality of cooling grids, and the cooling grids are assembled in a longitudinal direction. The cooling grid has a plurality of V-shaped profiles, and is configured such that the V-shaped outer shapes are mirror-symmetrically separated and offset from each other. Further, the leg portions of the adjacent V-shaped outer shapes are disposed so as to be spaced apart from each other, and a path of the intricate flow for the cooling air to flow is formed by the gap. The high-temperature cement clinker is placed on the cooling grid thus constituted, and the cement clinker can be conveyed while being cooled while conveying the cooling air through the intricate path.

Patent Document 1: Japanese Laid-Open Patent Publication No. 2007-515365

The cooler described in Patent Document 1 forms a complicated path in the cooling grid, and prevents the cement clinker from falling by conveying the cooling air through the intricate path. However, it is not because the cooling grid forms an intricate path to prevent all the cement clinker from falling, and there is still a case where a finer granular shape falls through the intricate path. In order to prevent the fall of the finer granular cement clinker, it is mentioned that there is a flow path area for narrowing the intricate path, but once the flow path area of the intricate path is reduced, the passing pressure of the cooling air is increased. Cooling grid The over-voltage loss is preferably about 30% of the laminate loss, and once it is above, the power consumption is unnecessarily increased.

Accordingly, it is an object of the present invention to provide a granular material that can be transported uniformly Cooling unit, which not only prevents the falling of larger granules, but also prevents the falling of finer granules and the chiller device provided therewith.

The cooling unit of the present invention is equipped to move to a high-temperature granular conveying object a cooling device that performs cooling while providing a support member having a bottom plate, and depositing a granular embedded material having a lower temperature than the granular material on the bottom plate to form a dead layer, and transmitting the dead layer The granular carrier is supported by the static load layer; and the diffuser is configured to release cooling air to the static load layer at a position buried in the static load layer.

According to the present invention, the air diffusing pipe and the bottom plate are separately provided for conveying the cooling air. Therefore, there is no need to form an intricate path for conveying cooling air to the bottom plate. Thereby, the granules can be prevented from falling from the bottom plate.

In addition, in the present invention, since the diffusing pipe can be buried in the static load layer, The cooling air released from the air diffusing pipe is transported to the granular conveyed material via the static load layer. Thereby, a moderate pressure loss can be imparted to the cooling air, and appropriate heat exchange can be performed. Thereby, the granular conveyance can be uniformly cooled.

Further, in the present invention, since the low temperature particles can be disposed on the bottom plate The diffusing pipe is buried in the static load layer of the buried body, so that the diffusing pipe does not directly contact the high-temperature granular conveying material. Therefore, it is possible to prevent the air diffusing pipe from being damaged by heat or being worn by the transport of the granular transporting material.

In the above invention, preferably, the air diffusing tube has a configuration and a transporting the granular shape The plurality of air diffusing ports for discharging the cooling air are parallel to each other, and the plurality of air diffusing ports are disposed in the air diffusing pipe at intervals in the transporting direction.

According to the above configuration, since the air diffusing pipe extends in the conveying direction and the air diffusing port is moved Since the feeding direction is arranged at intervals, the movement and stop of the granular conveyance can be repeated one at a time. In the cooler device that performs the transfer, the granular conveyance is uniformly cooled.

Further, in the present invention, since the cooling air is supplied from the plurality of air diffusing ports, the opening area, the number of the air diffusing ports, and the appropriate arrangement can be performed between the cooling air and the high temperature cement clinker. The best heat exchange.

In the above invention, it is preferable that the air diffusing opening is opened downward.

According to the above configuration, it is possible to prevent the granular embedded material from entering the diffusing pipe from the air diffusing port.

In the above invention, it is preferable that a plurality of the air diffusing tubes are provided at a position buried in the static load layer, and a header for connecting the plurality of air diffusing tubes and supplying cooling air to the air diffusing tubes is provided. And the header is disposed in a direction orthogonal to the transport direction.

According to the above configuration, the cooling air can be collectively supplied to the plurality of diffusing tubes by the header.

In the above invention, it is preferable that the support member has a wall that is erected on a peripheral portion of the bottom plate and formed in a box shape.

According to the above configuration, not only the granular embedded material can be prevented from falling from the bottom side, but also the granular embedded material can be prevented from falling from the front, back, left, and right.

The cooler device of the present invention includes a plurality of cooling unit rows configured such that any one of the cooling units is arranged in a row in the conveying direction, and the plurality of cooling unit rows are arranged side by side in the conveying direction Orthogonal direction.

According to the above configuration, the cooler device having the function as described can be realized.

The above and other objects, features and advantages of the present invention will become apparent from

According to the present invention, the granulated material to be conveyed can be uniformly cooled, and not only the falling of the larger granules but also the dropping of the fine granules can be prevented.

1‧‧‧Cooling unit

2‧‧‧ cooler device

Firing 13‧‧‧Cooling unit column

14‧‧‧Clinker layer

21‧‧‧ cabinet

21a‧‧‧floor

22‧‧‧Management

25‧‧‧Distribution tube

26‧‧‧ vents

27‧‧‧Static carrier layer

Fig. 1 is a schematic view showing the configuration of a cement plant apparatus having a cooler device of the present invention.

Fig. 2 is a perspective view showing the outline of the configuration of the cooler device of Fig. 1.

Fig. 3 is a front elevational view showing the configuration of a cooling unit provided in the cooler unit of Fig. 2.

Fig. 4 is a cross-sectional view showing the configuration of a cooling unit taken along the cutting line A-A shown in Fig. 3.

Fig. 5 is an enlarged cross-sectional view showing the vicinity of the diffusing pipe shown in Fig. 4 in an enlarged manner.

Hereinafter, the cooling unit 1 and the cooler device 2 including the same according to the embodiment of the present invention will be described with reference to the drawings. In addition, in the embodiment, the concept of the direction of the top, bottom, left, and right directions in the embodiment is for the convenience of the user, and the cooling unit 1 and the cooler device 2 are not limited to the arrangement and orientation of the components, and the like. In addition, the cooling unit 1 and the cooler device 2 described below are only one embodiment of the present invention, and the present invention is not limited to the embodiment, and may be added, deleted, or changed without departing from the scope of the invention. By.

<Cement Plant Equipment>

The cement is produced by a raw material pulverizing step of pulverizing a cement raw material containing limestone, clay, vermiculite, and iron, a firing step of firing the pulverized cement raw material, and a final step, that is, a finishing step. The three steps are taken in the cement plant equipment. In one of the three steps, that is, the calcination step, the pulverized cement raw material is fired and cooled to form a granular cement clinker. The configuration shown in Fig. 1 is a section showing the firing equipment 3 of the cement plant equipment, which is a part of the firing step in the cement manufacturing. In the firing apparatus 3, the cement raw material pulverized in the raw material pulverization step is preheated, calcined, and fired, and the granular cement clinker which is fired to a high temperature is cooled.

When the portion for performing the firing step is described in more detail, the firing device 3 is provided with a preheater 4, and the preheater 4 is composed of a plurality of cyclones 5. The cyclone separator 5 is arranged in a segment shape in the up-and-down direction, and the exhaust gas is blown up to the cyclone separator 5 in the upper stage (refer to the arrow of the dotted line in FIG. 1), and the input cement raw material is separated by the rotary flow. And it is put into the cyclone separator 5 of the lower stage (refer the arrow of the solid line of FIG. 1). The cyclone separator 5 located at a section above the lowermost stage serves to feed the cement raw material into the pre-burning furnace 6. The pre-baking furnace 6 has a burner for performing a reaction for separating carbon dioxide in the input cement raw material (that is, a calcination reaction) by the heat generated by the burner and the heat of the exhaust gas described below. In the pre-baking furnace 6, the cement raw material for promoting the calcination reaction is introduced into the cyclone separator 5 of the lowermost stage as the cement raw material in the cyclone separator 5 as described below, and further to the rotary furnace (rotary kiln) 7 supply.

The rotary furnace 7 is a so-called rotary kiln and is formed to have a horizontal length of several tens of meters or more. Cylindrical. The rotary furnace 7 is disposed such that the outlet from the side of the cyclone 5, that is, the inlet toward the front end side, is only slightly inclined downward. Therefore, by rotating the rotary furnace 7 around the axis, the cement raw material on the inlet side is transported to the outlet side. Further, a combustion device 8 is provided at the outlet of the rotary furnace 7. The combustion device 8 forms a high-temperature flame and fires the cement raw material.

Further, the combustion device 8 sprays a high-temperature combustion gas toward the inlet side, and burns The combustion gas injected from the burning device 8 flows into the rotary furnace 7 toward the inlet side while firing the cement raw material. The combustion gas is blown upward from the lower end of the preheating furnace 6 as a jet stream in the preheating furnace 6 as a high-temperature exhaust gas (see an arrow of a broken line in FIG. 1), and is put into the pre-burning furnace 6 The cement raw material is blown up. The cement raw material is heated to about 900 ° C by the exhaust gas and the burner, that is, calcined. Further, the blown cement raw material flows together with the exhaust gas to the lowermost cyclone separator 5, where the inflowing exhaust gas is separated from the cement raw material. The separated cement raw material is supplied to the rotary furnace 7, and the exhaust gas is blown up to the cyclone separator 5 of the upper stage. The blown exhaust gas heats the cement raw material by heat exchange with each of the cyclone separator 5 and the cement raw material supplied thereto, and is again separated from the cement raw material. The separated exhaust gas is further raised to the cyclone separator 5 thereon and the heat exchange is repeated. Then, it is discharged to the atmosphere from the cyclone separator 5 of the uppermost stage.

In the firing apparatus 3 thus constituted, the cement raw material is separated from the uppermost cyclone In the vicinity of the device 5, the cyclone separator 5 is sufficiently preheated and cooled to the uppermost stage while being heat-exchanged with the exhaust gas, and then introduced into the pre-baking furnace 6. In the pre-baking furnace 6, the cement raw material is pre-fired by a burner and a high-temperature gas, and then the cement raw material is introduced into the lowermost cyclone separator 5, where it is separated from the exhaust gas and supplied to the rotary furnace 7. The cement raw material to be supplied is conveyed to the outlet side while being fired in the rotary furnace 7. Thus, cement clinker is formed by preheating, calcining, and firing. At the outlet of the rotary furnace 7, a cooler device 2 is provided, and the formed cement clinker is discharged from the outlet of the rotary furnace 7 to the cooler device 2.

<cooler device>

The cooler device 2 cools the cement clinker (high-temperature granular material) discharged from the rotary furnace 7 while being transported in a predetermined transport direction. As shown in Fig. 2, the cooler unit 2 has a fixed inclined grate 11 immediately below the outlet of the rotary furnace 7. The fixed inclined furnace 11 is inclined downward from the outlet side of the rotary furnace 7 toward the conveyance direction. The granular cement clinker discharged from the outlet of the rotary furnace 7 is dropped in the conveying direction so as to roll on the fixed inclined furnace. Further, a plurality of cooling unit rows 13 are provided at the front end portion of the fixed inclined furnace 11 in the conveying direction, and cement clinker is deposited on the plurality of cooling unit rows 13 to form the mature layer 14.

The cooling unit row 13 is arranged side by side in the lateral direction (hereinafter, also referred to as "orthogonal direction") orthogonal to the conveyance direction so as not to be adjacent to each other with a gap therebetween. Further, between the cooling unit rows 13, the cement clinker is sealed so as not to fall below. The clinker layer 14 is placed thereon so as to cover all of the plurality of cooling unit rows 13 arranged side by side without gaps and sealed (see the 2-point chain line of FIG. 2).

Further, the plurality of cooling unit rows 13 are conveyed in the conveying direction while cooling the clinker layer 14. In the cooling unit row 13, the granular cement clinker is conveyed while repeating the movement and stopping of the clinker layer 14. As a specific transfer method, for example, after all the cooling unit rows 13 are advanced, the adjacent cooling unit columns 13 are divided into plural times. a method of retreating in a manner; or a crossbar extending in an orthogonal direction is disposed on an upper portion of the cooling unit row 13, and transporting the clinker layer 14 in a conveying direction by moving the crossbar in a conveying direction method. In addition, the configuration and method of conveying the clinker layer 14 in the conveying direction are not limited to the above-described configuration and method, and may be any configuration and method for conveying the clinker layer 14 in the conveying direction. The cooling unit row 13 configured as described above has a plurality of cooling units 1 and is configured such that the cooling units 1 are arranged in a row in the conveying direction.

As shown in FIGS. 3 and 4, the cooling unit 1 has a box shape forming a substantially rectangular parallelepiped. The casing 21 is. The casing 21 has a flat bottom plate 21a on the lower side and an upper side opening. Further, the casing 21 has four walls 21b to 21e which are erected on the bottom plate 21a. The bottom plate 21a of the casing 21 thus constructed is provided with a header 22 extending in the orthogonal direction.

The header 22 has a substantially U-shaped cross section having an opening on the lower side thereof, and An opening groove 21f extending in the orthogonal direction is formed at a position of the bottom plate 21a corresponding to the opening of the header 22. Further, the header 22 extends from one side wall 21d to the other side wall 21e, and the left and right end portions thereof are blocked by the two side walls 21d and 21e. Thereby, a supply passage 22a that communicates with the lower space 23 of the bottom plate 21a is formed in the header 22. The cooling air supply unit 24 (see FIG. 2) for supplying cooling air is connected to the space 23 below the bottom plate 21a, and the cooling air is supplied to the supply passage 22a via the space below the bottom plate 21a. In the header 22 thus configured, a plurality of (two in the present embodiment) are disposed in the casing 21 at intervals in the conveying direction, and a plurality of diffusing pipes 25 are provided in the headers 22.

The air diffusing pipe 25 is a cylindrical member that extends in the conveying direction. Air pipe 25, system They are disposed at intervals in the orthogonal direction, and are respectively disposed between the adjacent two headers 22 and between the header 22 and the front and rear walls 21b and 21c. The air diffusing pipe 25 has a cooling passage 25a therein, and the cooling passage 25a communicates with the supply passage 22a in the header 22. On the other hand, the end portions of the air diffusing tubes 25 provided in the front and rear walls 21b and 21c, respectively, are blocked by the front and rear walls 21b and 21c. The air diffusing pipe 25 provided in this manner supplies cooling air from the header 22, and the cooling air flows in the cooling passage 25a. and Further, a plurality of air diffusing ports 26 are provided in the air diffusing pipe 25.

As shown in FIG. 5, the air diffusing port 26 is tied to the axis orthogonal to the axis of the air diffusing pipe 25. The surface is disposed on both sides in the orthogonal direction on the lower half of the diffuser tube 25, and is opened in the radial direction and obliquely downward. The air diffusing ports 26 thus opened are formed in the air diffusing pipe 25 so as to be disposed at substantially equal intervals in the conveying direction. The air diffusing pipe 25 is provided so as to be separated from the bottom plate 21a by a height h so that the air diffusing ports 26 are not covered by the bottom plate 21a, and is disposed in parallel with the bottom plate 21a. Thereby, the cooling air flowing in the air diffusing pipe 25 is released to the outside from the air diffusing port 26.

In the casing 21 in which the diffusing pipe 25 is disposed, the charging is discharged from the furnace 7. Usually, the cement clinker is made of cement clinker which is lower in temperature (for example, normal temperature of 20 ° C to 60 ° C), and the tank 21 is filled with cement clinker. Thereby, cement clinker is deposited on the bottom plate 21a to form a static load layer 27 (refer to the two-point chain line of FIGS. 3 to 5). On the static load layer 27, a granular cement clinker to be conveyed (clinker layer 14, see the two-point chain line of FIGS. 3 and 4) is placed, and the bottom plate 21a is supported by the static load layer 27 to support the granular shape. Cement clinker (clinker layer 14).

In addition, the gas pipe 25 is buried by filling the inside of the casing 21 with cement clinker. Enter the static load layer 27. That is, the air diffusing pipe 25 is buried in the static load layer 27. Thus, by embedding the diffuser tube 25 in the static load layer 27, the cooling air discharged from the diffuser tube 25 can be passed between the cement clinker of the static load layer 27 to be transported to the clinker layer 14 thereon. Thereby, an appropriate passing pressure loss can be imparted to the cooling air by the static load layer 27.

The pressure loss of the static load layer 27 becomes the height of the layer and the arrangement of the air diffusing port 26, The layer corresponding to the size and the height of the static load layer 27 formed by filling the inside of the casing 21 is determined by the side walls 21d and 21c of the casing 21. Therefore, the pressure loss of the static load layer 27 is set to a value corresponding to the shape of the casing 21 and the arrangement of the air diffusing ports 26, and the arrangement height h of the air diffusing pipe 25 and the diameter of the air diffusing port 26 are appropriately set. The number of passes through the pressure loss of the entire cooling unit 1 can be a desired value.

By making the pressure loss into a desired value in this way, the clinker layer can be suppressed The deviation of the cooling air in the clinker layer 14 caused by the deviation of the layer height of 14 or the particle size distribution of the cement clinker. That is, the clinker layer 14 can be supplied with a substantially evenly distributed flow of cooling air, and the clinker layer 14 can be uniformly cooled. Specifically, by making the pressure loss of the entire cooling unit 1 into an appropriate value, it is possible to reduce the pressure loss difference due to the variation in the layer height of the clinker layer 14 or the particle size distribution of the cement clinker relative to the cooling. The ratio of the pressure loss of the unit 1 and the clinker layer 14 through. Thereby, the cooling air flows into the clinker layer 14 substantially directly above, and the drift of the cooling air can be suppressed. Therefore, the clinker layer 14 can be uniformly cooled.

Further, since the diffusing pipe 25 is buried in the static load layer 27, the diffusing pipe 25 does not directly contact the clinker layer 14 which is heated and moves. Therefore, the air diffusing pipe 25 can be prevented from being damaged by heat or worn by the movement of the clinker layer 14.

Further, since it is not necessary to form the grooves or holes for supplying the cooling air to the bottom plate 21a by using the air diffusing pipe 25 as in the prior art, the cement clinker and the granular cement clinker do not leak downward from the bottom plate 21a. Further, since the walls 21b to 21e are vertically provided in the conveying direction and the orthogonal direction, it is possible to prevent the cement clinker from leaking from the inside of the casing 21 to the conveying direction and the orthogonal direction (that is, the front, rear, left and right). Further, since the air diffusing port 26 of the air diffusing pipe 25 is opened obliquely downward, the cement clinker can be prevented from entering the air diffusing pipe 25 via the air diffusing port 26. That is, the air diffusing port 26 is formed at an angle θ such that the cement clinker does not enter the diffusing pipe 25 through the air diffusing port 26. Thereby, it is possible to prevent the air diffusing port 26 and the air diffusing pipe 25 from being clogged by the cement clinker, and the cooling air of a desired flow rate can be transported to the clinker layer 14 via the static load layer 27.

In the cooler device 2 configured as above, the granular cement clinker discharged from the rotary furnace 7 is received by the fixed inclined furnace 11 and rolled toward the cooling unit row 13 side. Then, cement clinker is deposited on the cooling unit row 13, and the mature layer 14 is formed on the cooling unit row 13, and the clinker layer 14 is conveyed in the conveying direction by the method described above. During the conveyance, the cooling air supply unit 24 (fan) is operated, and the cooling air is supplied from the cooling air supply unit 24 to the supply passage 22a of the header 22 via the lower space 23. Cooling air in the header 22, The cooling passages 25a that reciprocate the plurality of air diffusing pipes 25 are simultaneously conveyed and released to the outside through the respective air diffusing ports 26. The cooling air released from the air diffusing port 26 rises in the manner of passing through the cement clinker of the static load layer 27 to reach the clinker layer 14. The cooling air is heat-exchanged with the granular cement clinker of the clinker layer 14 and is discharged from the upper portion of the clinker layer 14 while being cooled while passing therethrough. The air discharged to the upper portion has been heated to a high temperature by heat exchange with the granular cement clinker, and becomes a part of the high-temperature air, is discharged from the cooler device 2, and is directly introduced into the pre-burning through the furnace 7 or the discharge pipe 31. Furnace 6.

In the cooler device 2, the granular cement clinker of the clinker layer 14 is cooled by the cooling unit 1 while being cooled, and the granular cement clinker is continuously cooled to a relatively high temperature of several tens of degrees. The temperature.

<About other embodiments>

In the present embodiment, as the granular material forming the static load layer 27, cement clinker is used, but a heat-resistant granular material other than cement clinker, for example, a granular material such as metal or ceramic, may be used. Further, the size of the particle size of the transferred granules and the granules forming the static load layer 27 is not limited. The shape and arrangement position of the air diffusing pipe 25 are not limited to the shape and position as described above, and may be orthogonal to the conveying direction, and the air diffusing pipe 25 may be arranged to form a bellows shape (expanding shape). Further, in the present embodiment, the bottom plate 21a is a flat plate, but may be a V-shaped plate that protrudes downward or upward, or an inclined plate that is inclined in the orthogonal direction or the conveying direction.

Numerous modifications or other embodiments of the invention will be apparent to those skilled in the <RTIgt; Accordingly, the description is to be construed as illustrative only, and the description of the embodiments of the invention. The details of construction and/or function may be varied substantially without departing from the spirit of the invention.

1‧‧‧Cooling unit

14‧‧‧Clinker layer

21‧‧‧ cabinet

21a‧‧‧floor

21b, 21c, 21d‧‧‧ wall

21f‧‧‧Open slot

22‧‧‧Management

22a‧‧‧Supply access

23‧‧‧Lower space

25‧‧‧Distribution tube

25a‧‧‧Cooling path

26‧‧‧ vents

27‧‧‧Static carrier layer

H‧‧‧height

Claims (6)

A cooling unit is a cooling unit of a cooler device that cools a high-temperature granular material while being conveyed, and includes a support member having a bottom plate and depositing the granular material on the bottom plate a lower temperature granular embedded body to form a static load layer, and supporting the granular transport material through the static load layer; and a diffusing gas tube for releasing the static load layer at a position buried in the static load layer Cool the air. The cooling unit of claim 1, wherein the air diffusing pipe has a plurality of air diffusing ports arranged to be parallel to a conveying direction for transporting the granular conveying material and releasing the cooling air; the plurality of air diffusing ports, The air diffusing ducts are disposed at intervals in the transport direction. A cooling unit according to claim 2, wherein the air diffusing opening is open toward the lower side. The cooling unit of claim 3, wherein a plurality of the air diffusing tubes are disposed at a position buried in the static load layer, and the plurality of air diffusing tubes are connected and the cooling air is supplied to the air diffusing tubes. a tube; the header is disposed in a direction orthogonal to the transport direction. The cooling unit of claim 1, wherein the support member has a wall that is erected on a peripheral portion of the bottom plate and is formed in a box shape. A chiller device comprising a plurality of cooling unit rows configured such that the cooling units of the first aspect of the patent application are arranged in a row in the conveying direction; the plurality of cooling unit rows are arranged side by side in the direction of the conveying direction The direction of the exchange.