WO2013047640A1 - Raw material heating device - Google Patents

Abstract

To address the problem of providing a raw material heating device capable of continuing with a subsequent process, a tubular body (3), which is formed in a tubular shape centered on a horizontally extending axis (2) and rotates around said axis, has apertures (6A, 6B) at both ends in the axial direction. A raw material input pipe (7) is arranged at the aperture (6A) at one end in the axial direction, and introduces a raw material which is a water-containing combustible material into the tubular body (3) as the material to be heated, and a superheated steam feeding pipe (8) is arranged at either the aforementioned aperture at one end or the aperture at the other end, and feeds superheated steam into the tubular body from the one aperture toward the other. In addition, transport means, which transport the raw material from the aperture at one end to the aperture at the other end, are provided within the tubular body (3) except at both ends thereof in the axial direction, and the water content of the raw material is dried by heating the raw material with the superheated steam as it is transported, with the raw material being discharged in a high-temperature state from the aperture part at the other end after being dried.

Description

Raw material heating device

This invention relates to the raw material heating apparatus which heats the raw material which is a water-containing combustible material.

For example, an apparatus disclosed in Patent Document 1 is known as an apparatus for heating and drying a raw material that is a hydrated combustible material.

In the apparatus in Patent Document 1, an inner cylinder having both ends opened is concentrically disposed in a horizontal cylindrical body having one end opened and the other end closed, and the inner cylinder and the cylindrical body are disposed from one end side. The water-containing carbonaceous material is charged into the annular space as a raw material, and the cylindrical body is heated from the outer surface, so that the raw material is heated, dried, carbonized and activated while being conveyed toward the other end, and then the other end side. The product is discharged from one end side while being introduced into the inner cylinder from the annular space and cooled in the inner cylinder.

In Patent Document 1, the flow of the raw material in the annular space between the inner cylinder and the cylindrical body is opposite to the flow of the raw material in the inner cylinder, and the other end is introduced from the annular space into the inner cylinder. At that time, the high temperature raw material is cooled by exchanging heat with the raw material immediately after being put into the annular space that has not been sufficiently heated as the conveyance proceeds toward the one end side in the inner cylinder. Discharged as a product.

Japanese Patent No. 3558353

∙ Products obtained by heat-treating hydrous raw materials may be further subjected to processing such as compression in subsequent steps. In that case, the product may have to be heated again to a temperature suitable for processing for subsequent processing.

However, in Patent Document 1, the device has a structure in which an annular space is formed by a cylindrical body and an inner cylinder, and the raw material in the annular space is heated by heating the cylindrical body from the outer surface. The heated material is cooled by heat exchange with the material in the annular space while being conveyed in the inner cylinder. Therefore, in order to compress this product in the subsequent process, for example, the compression process in the briquette apparatus, it is necessary to heat the product again to a temperature suitable for compression and raise the temperature, and the briquette apparatus must be directly connected. Can not. For example, when the raw material is lignite, since the lignite has a high water content, the transportation cost is high and the energy efficiency as a fuel is low as it is. Therefore, the lignite is dried for improvement, but when it is dried, it becomes a powder and reacts with oxygen in the air to cause a dust explosion. Therefore, briquettes are used for storage and transportation, and the contact area with air is reduced. However, in order to briquette, it is necessary to perform compression processing at an appropriate high temperature state, and the apparatus of Patent Document 1 is suitable for performing processing at a high temperature such as briquetting after drying a raw material such as lignite. I can not say.

This invention makes it a subject to provide the raw material heating apparatus which can discharge | emit the raw material which is a water-containing combustible material by heat processing, such as drying, and can discharge | emit this raw material in the high-temperature state convenient for performing subsequent high temperature processing.

According to the present invention, the above-described problem is that a cylindrical body that is formed in a cylindrical shape around an axis extending in the lateral direction and that rotates around the axis has openings at both ends in the axial direction. A raw material injection pipe for introducing a raw material, which is a hydrous combustible material, into the cylindrical body as an object to be heated is located, and superheated steam is directed to one of the opening on the one end side and the opening on the other end side in the cylindrical body. The superheated steam feed pipe to be fed is located, and the cylindrical body is provided with a transport means for transporting the raw material from the opening on one end side to the opening on the other end side in an intermediate area excluding both ends in the axial direction. It is solved by a raw material heating device characterized in that the moisture of the raw material is dried by heating with superheated steam during transportation, and the raw material is discharged from the opening on the other end side in a high temperature state after drying. The

According to the raw material heating apparatus of the present invention having such a configuration, the raw material that is the hydrated combustible material introduced from the opening on one end side is conveyed by the conveying means toward the opening on the other end side in the rotating cylindrical body. In the meantime, it is brought into contact with the superheated steam in a countercurrent or cocurrent flow, gradually dried and subjected to a treatment such as thermal decomposition. Since the raw material which received this process is heated with superheated steam and is not cooled during conveyance, it is discharged | emitted from the opening part of the other end side, maintaining the high temperature state. Therefore, if an apparatus for performing subsequent processing at a high temperature is connected to the opening on the other end side, the raw material can be directly subjected to subsequent processing without additional heating energy.

In the present invention, the cylindrical body has an opening on one end and an opening on the other end connected to the circulation path and a superheated steam feed pipe outside the cylindrical body, and a superheated steam heating section is connected to the circulation path. The temperature of the low-temperature superheated steam extracted from the cylindrical body after being heated and lowered after heating the raw material in the cylindrical body is increased by heating in the superheated steam heating section, thereby forming superheated steam. It is preferable to feed into the cylindrical body through the circulation path and the superheated steam feed pipe. In this way, even if the superheated steam is cooled down after heating the raw material to become low-temperature superheated steam, the superheated steam is heated again in the superheated steam heating section using only the insufficient energy using the remaining retained heat. As a result, it becomes possible to feed the cylindrical body. Specifically, the superheated steam heating unit is realized as a heat exchanger that receives a high temperature fluid from the outside and exchanges the low temperature heated steam with high temperature superheated steam by heat exchange between the high temperature fluid and the low temperature superheated steam in the circulation path. it can. Here, in the present application, the low temperature superheated steam refers to superheated steam that is cooled down after being heated in the cylindrical body and then extracted to the outside of the cylindrical body. Separated.

In the present invention, it is preferable that the cylindrical body is connected to a briquette apparatus that receives the raw material in a high temperature state discharged from the opening on the other end side and compresses it at the opening on the other end side. By doing so, the heat-treated raw material is made into briquettes as it is. At that time, the briquette device may be directly connected to the opening on the other end side of the cylindrical body, or may be connected via a conveyor or the like. When a conveyor or the like is used, consideration must be given to avoid that the temperature of the raw material drops to a temperature unsuitable for subsequent processing during conveyance to the briquetting apparatus on the conveyor or the like.

In the present invention, the cylindrical body is preferably provided with a lifter member that scoops up the raw material along with the rotation of the cylindrical body on the inner peripheral surface of the cylindrical body. By using the lifter member, the raw material being conveyed in the cylindrical body is stirred and heated uniformly and satisfactorily.

In the present invention, the conveying means has a partition plate extending in the axial direction and in the radial direction to partition the cylindrical body space into a plurality of parts, and an inclined guide plate standing from the surface of the partition plate and having an inclination angle with respect to the axis. Can be like that. By providing the partition plate having the inclined guide plate, even if the raw material is charged at a high filling rate with respect to the volume of the cylindrical body, the conveying speed is lowered while sufficient stirring is performed, and the residence time in the cylindrical body is reduced. It becomes long and it is not necessary to increase the length of the cylindrical body, so that the apparatus can be miniaturized.

In the present invention, the conveying means has inclined guide plates on both surfaces of the partition plate, and the inclined guide plates on both surfaces have their inclination angles with respect to the axis reversed when both surfaces come to the same direction. In addition, it is preferable that the raw material circulates through the space at both end edges in the axial direction of the partition plate during conveyance. By carrying out like this, since a raw material circulates as mentioned above during conveyance, the residence time in a cylindrical body becomes still longer.

In the present invention, as described above, since the raw material which is a hydrated combustible material is directly contacted with superheated steam in the cylindrical body and subjected to heat treatment such as drying, the dried raw material is discharged as a product in a high temperature state. As a result, it becomes possible to receive subsequent high-temperature processing as it is, and energy saving and downsizing of the equipment as a whole can be achieved. Further, even if the superheated steam becomes low-temperature superheated steam after the raw material is heated, it can be reused as high-temperature superheated steam only by adding a deficient amount of energy to the remaining retained energy, so that energy efficiency is good. Furthermore, water vapor generated when the raw material is dried can be used as a part of the superheated water vapor, and energy efficiency is improved also in this respect.

It is a schematic block diagram of the apparatus of one Embodiment of this invention. It is sectional drawing in a surface orthogonal to the axis line of the cylindrical body in FIG. It is a schematic block diagram of the other embodiment apparatus of this invention. It is a schematic block diagram of the apparatus of further another embodiment of the present invention. It is a schematic block diagram of the apparatus of further another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1, the raw material heating apparatus 1 of the present embodiment includes a cylindrical body 3 that rotates around an axis 2 having a downward inclination of 3 ° or less toward the right or the horizontal with respect to the horizontal or horizontal line. The cylindrical body 3 is, for example, a cylindrical shape, and annular flanges 4A and 4B are provided on the outer periphery in the vicinity of both ends in the axial direction, and are supported by the bearings 5A and 5B by the annular flanges 4A and 4B. It is slowly rotated around the axis 2 by a driving means (not shown), for example, at 1 to 10 rpm.

The cylindrical body 3 has an opening 6A and an opening B on one end (left end in FIG. 1) and the other end (right end in FIG. 1) in the direction of the axis 2, respectively. The raw material charging pipe 7 enters the opening 6A, and the superheated steam feed pipe 8 is arranged so as to communicate with the opening 6B on the other end side. The raw material charging pipe 7 and the superheated steam feeding pipe 8 form rotational seals with the openings 6A and 6B, respectively, so as to allow the cylindrical body 3 to rotate.

An exhaust pipe 9 is connected to the opening 6A on one end side so as to form a rotational seal with the opening 6A so as to allow the cylindrical body 3 to rotate. 3 gas (mainly low-temperature superheated steam that has been cooled after heating the raw material, so hereinafter referred to as low-temperature superheated steam, distinguishing superheated steam fed into the cylindrical body as high-temperature superheated steam) is extracted. ing. The exhaust pipe 9 is separated, and the low-temperature superheated steam is appropriately discharged to the outside, while the circulation path 10 is arranged so that a part of the low-temperature superheated steam is converted into high-temperature superheated steam and then returned to the cylindrical body 3 again. Is provided. A blower 11 and a superheated steam heating unit 12 are connected to the circulation path 10. The blower 11 heats a part of the low-temperature superheated steam from the exhaust pipe 9 by the superheated steam heating unit 12 to form high-temperature superheated steam, and then opens the opening 6B at the other end of the cylindrical body 3 from the superheated steam feed pipe 8. Pump to return to. The superheated steam heating unit 12 is in the form of a heat exchanger, and a high-temperature fluid from the outside is received from the supply pipe 12A in the container through which the circulation path 10 passes, and the circulation path 10 is connected to the superheated steam heating unit. The low-temperature superheated steam flowing into the heat source 12 is heated by heat exchange with the high-temperature fluid and flows out as high-temperature superheated steam. The hot fluid is cooled by heat exchange and discharged from the exhaust pipe 12B. The product discharge pipe 13 communicates with the opening 6B of the cylindrical body 3 through which the superheated steam feed pipe 8 communicates and extends downward.

In the inner space of the rotating cylindrical body 3, two partition plates 14 and 15 extending in the diametrical direction and the axial direction through the axis 2 are axially disposed in an intermediate area excluding the areas A and C near both ends in the axial direction. The partition plates 14 and 15 are divided into the above-mentioned internal spaces to form two spaces (see also FIG. 2). As described above, the partition plates 14 and 15 communicate with each other in the vicinity of both ends in the axial direction and between the two partition plates 14 and 15. Each of the partition plates 14 and 15 is provided on both surfaces with inclined guide plates 16 and 17 which are perpendicular to the surface and inclined with respect to the axis 2 in a blade shape at a plurality of positions in the axial direction as conveying means. Yes. The inclined guide plates 16 and 17 are inclined when, for example, the plate surface opposite to the front plate surface of the partition plates 14 and 15 in FIG. Are provided in the same direction. Since the partition plates 14 and 15 rotate in one direction around the axis 2 together with the cylindrical body 3, the plate surfaces of the partition plates 14 and 15 face one side, for example, the front side with respect to the paper surface in FIG. The raw material in the cylindrical body 3 is scraped up by this plate surface while the raw material slides along the inclined guide plates 16 and 17 when facing the opposite side. Since the inclined guide plates 16 and 17 on both plate surfaces of the partition plates 14 and 15 are inclined in the same direction, when the raw material comes to the near side with respect to the paper surface, the raw material is transferred to the partition plates 14 and 15. It slides along the inclined guide plates 16 and 17 on each plate surface, and proceeds to the other end side (right end side) in the axial direction, and proceeds to one end side (left end side) on the other plate surface. Since the two partitioned spaces partitioned by the partition plates 14 and 15 communicate with each other at both ends in the axial direction to form the communication areas A, B, and C, the raw material passes through the communication areas A, B, and C. Circulate through the two compartments. That is, this circulation forms two circulations around the partition plate 14 passing through the regions A and B and around the partition plate 15 passing through the regions B and C. Thus, the residence time of the raw material in the cylindrical body 3 is increased, and the raw material is scraped up by the partition plates 14 and 15, so that the raw material is sufficiently heated and superheated steam flowing from the other end side to the one end side in the cylindrical body 3. Direct contact with a large area. As a result, the filling rate of the raw material in the cylindrical body 3 can be increased, and a filling rate of 10 to 30% can be obtained.

According to the apparatus of this embodiment, the raw material that is a hydrated combustible material is heat-treated in the following manner.

First, in the one end side opening 6A, a hydrated combustible material such as lignite is introduced from the raw material input pipe 7 into the cylindrical body 3, and in the other end side opening 6B, a high temperature of 150 to 1200 ° C. is supplied from the superheated steam inlet pipe 8. Superheated steam is fed into the cylindrical body 3.

The raw material passes through both sides of the partition plate 14 and the areas A and B by the action of the partition plate 14 with the tilt guide plate 16 and the partition plate 15 with the tilt guide plate 17 that rotate together with the cylindrical body 3. Circulates toward the other end while circulating, and then transports toward the other end while circulating around the partition plate 15 through both sides B and C of the partition plate 15 and reaches the opening 6B. The raw material is heated in direct contact with the high-temperature superheated steam fed from the superheated steam feed pipe 8 on the other end side while being transported, heated, dried, and then subjected to a heat treatment such as pyrolysis to be in a high temperature state. The product is discharged from the product discharge pipe 13 while maintaining the above. This high-temperature product can be subjected to processing such as compression in a high-temperature state in the next step.

The high-temperature superheated steam sent into the cylindrical body 3 from the other end side heats the raw material and itself cools down to become low-temperature superheated steam at 120 to 300 ° C. to form the low-temperature superheated steam along with the steam and gas generated from the raw material. To the outside of the cylindrical body 3. Most of the low-temperature sound superheated steam is discharged to the outside, but a part of the low-temperature sound superheated steam is sent to the superheated steam heating unit 12 via the circulation path 10 by the blower 11, where heat with the high-temperature fluid flowing in from the supply pipe 12 </ b> A. The temperature is raised by the exchange to become high-temperature superheated steam, which is sent again into the cylindrical body 3 from the superheated steam feed pipe 8 through the circulation path 10 and used for heating the raw material.

In the form of FIG. 1, the raw material is fed from the raw material charging pipe 7 on one end side of the cylindrical body 3, the high-temperature superheated steam is fed from the superheated steam feed pipe 8 on the other end side, and the raw material is high-temperature superheated steam. However, as in the other embodiment shown in FIG. 3, it may be a cocurrent contact.

In FIG. 3, the raw material input pipe 7 and the superheated steam feed pipe 8 are concentrically arranged on one end side of the cylindrical body 3, and the raw material and the high temperature superheated steam are in parallel flow contact with each other inside the cylindrical body 3. To the other end. The circulation path 10 is provided with a superheated steam heating unit 12 and a blower 11 similar to the case of FIG. 1, and a part of the low-temperature superheated steam from the other end of the cylindrical body 3 is heated by the blower 11. It is to be sent to the part 12.

In the embodiment of FIG. 1, the partition plates 14 and 15 in the cylindrical body 3 are separated, but both may be partially connected as in another embodiment shown in FIG. 4. In this case, both the partition plates 14 and 15 are connected by the connection plate 19 on the inner peripheral surface side of the cylindrical body 3, and a region B corresponding to the region B communicating in FIG. It is preferable to form '. By providing the connection plate 19 on the inner peripheral surface side of the cylindrical body 3, the raw material is scraped up by the connection plate 19, and the raw material can be stirred well.

In order to more actively scrape the raw material, a plurality of bucket-shaped lifter members 20 distributed in the circumferential direction are provided on the inner peripheral surface of the cylindrical body 3 as shown by a two-dot chain line in FIG. It is preferable. The lifter member 20 is provided at least in the range where the partition plates 14 and 15 exist in the axial direction. At that time, it is preferable that the partition plates 14 and 15 partially form window-like notches to avoid interference at positions where the lifter member 20 interferes with the partition plates 14 and 15.

In still another embodiment of the present invention, as shown in FIG. 5, the opening 6 </ b> B on the other end side of the cylindrical body 3 has a briquette device 21 as an example of subsequent processing, below the product discharge pipe 13. Is arranged. The briquette device 21 includes a compression unit 22 having a pair of compression rollers 22 </ b> A and a cooling unit 23.

The product (intermediate product) that has been subjected to heat treatment such as thermal decomposition after being dried in the cylindrical body 3 and discharged from the product discharge pipe 13 in a high temperature state is compressed into a briquette by being compressed by the compression unit 22 of the briquette device 21. Then, it is cooled by the cooling unit 23 to become a final product and is discharged from the discharge unit 24. For the purpose of briquetting lignite, the temperature of the product (intermediate product) when discharged from the product discharge pipe 13 is preferably 300 to 400 ° C. When the product (intermediate product) is intended for biomass-reducing pyrolysis, the temperature at which the product is heated is 150 to 400 ° C., and when the purpose is a gasification reaction with char steam generated by heating, 1000 to 1200 ° C.

DESCRIPTION OF SYMBOLS 1 Raw material heating apparatus 2 Axis 3 Tubular body 6A Opening part 6B Opening part 8 Superheated steam feed pipe 10 Circulation path 12 Superheated steam heating part (heat exchanger)
14 Partition plate (conveying means)
15 Partition plate (conveying means)
16 Inclined guide plate (conveying means)
17 Inclined guide plate (conveying means)
20 Lifter member 21 Briquetting equipment

Claims (7)

1. A cylindrical body that is formed in a cylindrical shape around an axis extending in the lateral direction and that rotates around the axis has openings at both ends in the axial direction, and a raw material that is a hydrated combustible material at the opening at one end in the axial direction. There is a raw material charging pipe to be charged into the cylindrical body as a product, and a superheated steam feeding pipe for feeding superheated steam into one of the opening on the one end side and the opening on the other end side into the cylindrical body. Located in the cylindrical body, in the intermediate area excluding both axial ends, a conveying means for conveying the raw material from the opening on one end side to the opening on the other end side is provided, and the moisture of the raw material is conveyed A raw material heating apparatus, wherein the raw material is dried by being heated with superheated steam, and the raw material is discharged from an opening on the other end side in a high temperature state after drying.
2. The cylindrical body has an opening on one end and an opening on the other end connected to the circulation path and a superheated steam feed pipe outside the cylindrical body, and a superheated steam heating section is provided in the circulation path. In addition, the temperature of the low-temperature superheated steam extracted from the cylindrical body after the raw material is heated and lowered after being heated in the cylindrical body is heated by the superheated steam heating section, and the circulation path and superheated steam are heated. The raw material heating apparatus according to claim 1, wherein the raw material heating apparatus is fed into a cylindrical body through a superheated steam feed pipe.
3. The superheated steam heating unit is a heat exchanger that receives a high temperature fluid from the outside and exchanges the low temperature heated steam with higher temperature superheated steam by heat exchange between the high temperature fluid and the low temperature superheated steam in the circulation path. The raw material heating apparatus according to claim 2.
4. The cylindrical body is connected to a briquette device that receives a raw material in a high temperature state discharged from the opening on the other end side and compresses it at the opening on the other end side. Item 3. The raw material heating apparatus according to Item 2.
5. The cylindrical body is provided with a lifter member for scraping a raw material along with the rotation of the cylindrical body on the inner peripheral surface of the cylindrical body. The raw material heating apparatus as described in one.
6. The conveying means has a partition plate extending in the axial direction and in the radial direction to partition the cylindrical body space into a plurality, and an inclined guide plate standing from the surface of the partition plate and having an inclination angle with respect to the axis. The raw material heating apparatus according to claim 1.
7. The conveying means has inclined guide plates on both sides of the partition plate, and the inclined guides on both sides are opposite to each other in the inclination angle with respect to the axis when the both surfaces come to the same direction. The raw material heating apparatus according to claim 1 or 6, wherein the raw material heating apparatus circulates through a space at both end edges in the axial direction of the partition plate.

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