JP6910623B1 - Cyclone inner cylinder configuration panel and Cyclone inner cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a panel constituting a cyclone inner cylinder having a long life. SOLUTION: A panel (15) in which a plurality of panels (15) are connected in a circumferential direction and a vertical direction to form a cyclone inner cylinder (3) is targeted. The panel (15) has a predetermined plate thickness having a rectangular planar shape, but in the present invention, the plate thickness is not uniform and a part of the panel (15) is formed to be thick. Specifically, the panel (15) is formed thick in the vicinity of both long sides of the rectangle. A hanging portion (17) is formed at the upper end portion corresponding to one short side of the rectangle, and a locking portion (18) is formed at the lower end portion corresponding to the other short side. [Selection diagram] Fig. 2

Description

The present invention forms of a suspension preheater that preheats raw material powder such as cement by high-temperature exhaust gas from a kiln, from a configuration panel of a cyclone inner cylinder provided inside the cyclone constituting the suspension preheater, and a configuration panel. It is about the cyclone inner cylinder to be made.

As is well known, cement is obtained by finely pulverizing a raw material powder composed of limestone, clay, silica stone, etc. and firing it at a high temperature with a rotary kiln or the like. The hot exhaust gas emitted from the rotary kiln is used to preheat the raw material powder by a suspension preheater. That is, the suspension preheater is composed of a plurality of cyclones connected in multiple stages, the exhaust gas from the rotary kiln is supplied to the lowermost cyclone, and the raw material powder is supplied to the uppermost cyclone. In the cyclone of each stage, the exhaust gas and the raw material powder are mixed and supplied. The raw material powder is separated from the exhaust gas after heating and supplied to the lower cyclone, and the exhaust gas is supplied to the upper cyclone. It has become so. That is, in a plurality of cyclones connected in multiple stages, the raw material powder flows from the upper stage to the lower stage, and the exhaust gas flows from the lower stage to the upper stage. become. The fully preheated raw material powder is supplied to the rotary kiln, and the cooled exhaust gas is discharged to the outside.

By the way, as is well known, the cyclone constituting the suspension preheater is composed of a substantially cylindrical main body portion and a tapered portion narrowed downward from the main body portion. A cyclone inner cylinder is provided inside the main body. When the raw material powder and the exhaust gas are supplied into the cyclone, the mixture of these swirls outside the cyclone inner cylinder inside the cyclone body, the raw material powder having a large specific gravity is discharged from below the tapered portion, and the exhaust gas is discharged from the cyclone inner cylinder. It is designed to be discharged from above through. Since such a cyclone inner cylinder is exposed to highly corrosive high-temperature exhaust gas, corrosion progresses due to long-term operation. It needs to be replaced when the corrosion becomes large. The cyclone inner cylinder may be formed as an integral structure, but the integral structure has a problem that the replacement work is complicated.

Japanese Unexamined Patent Publication No. 6-101977 Japanese Unexamined Patent Publication No. 2007-040574

The applicant proposes a split assembly type cyclone inner cylinder in Patent Documents 1 and 2. That is, the cyclone inner cylinder is composed of a plurality of components, that is, a plurality of panels. The panel 51 is made of, for example, stainless steel, a heat-resistant alloy, etc., and is formed in a substantially rectangular shape as shown in FIG. It forms a portion 53. In the cyclone main body, as shown in FIG. 4 (B), a hanging metal fitting 55 is provided above the cyclone main body. Although the metal fittings 55 are not shown in the figure, a plurality of metal fittings 55 are provided so as to be arranged in a circumferential shape. Then, the plurality of panels 51, 51, ... Are hung in a circumferential direction so as to engage the hanging portions 52, 52, ... With these plurality of metal fittings 55. As a result, the first stage 58 of the cyclone inner cylinder is formed. Then, a plurality of panels 52, 52, ... Are circled so that the hanging portions 52, 52, ... Engage with the locking portions 53, 53, ... Of the first-stage panels 51, 51, ... Suspend them side by side in the circumferential direction. That is, the second stage 59 of the cyclone inner cylinder is formed. The required number of stages is sequentially formed in this way to form the cyclone inner cylinder 50.

Since the cyclone inner cylinder 50 described in Patent Documents 1 and 2 can be configured only by suspending a plurality of panels 51, 51, ..., It can be easily configured. Therefore, even if the panels 51, 51, ... Are deteriorated or damaged due to corrosion, they can be replaced immediately and are excellent in maintainability. However, there are some points to be improved with respect to the cyclone inner cylinder 50 composed of such a plurality of panels 51, 51, .... Specifically, it seems that there is room to delay the progress of deterioration and increase the replacement cycle. FIG. 4 (C) shows a cross-sectional view of the panel 51 cut at the ZZ cross section in FIG. 4 (A). The panel 51 is formed from a uniform plate thickness. The panel 51 is corroded and deteriorated when exposed to high-temperature exhaust gas due to long-term operation. When the present inventors examined the panel 51 in which the corrosion had progressed, they found that the corrosion was large in the vicinity of the end face of the panel 51 as shown in FIG. 4 (D). It should be noted that what is shown in FIG. 4 (D) is a cross section in the vicinity of the long side of the panel 51, which is an enlarged portion of reference numeral 60 in FIG. 4 (C). As described above, the present inventors have found that the portion where the panel 51 has many surfaces in contact with the exhaust gas is more corroded than the other portions. There should be room for improvement in delaying the progress of such corrosion and extending the life of the panel 51.

According to the present invention, the cyclone inner cylinder is composed of a plurality of panels. For such a panel, the progress of deterioration due to high-temperature exhaust gas can be delayed and the replacement cycle can be lengthened as much as possible. It is an object of the present invention to provide a panel for a cyclone inner cylinder, and a cyclone inner cylinder composed of such a panel.

The present invention is intended for a panel for forming a cyclone inner cylinder, in which a plurality of panels are connected in the circumferential direction and the vertical direction to form a cyclone inner cylinder. The panel has a predetermined plate thickness having a rectangular planar shape, but in the present invention, the plate thickness is not uniform and a part is formed to be thick. Specifically, the panel is formed thick in the vicinity of both long sides of the rectangle. The panel is designed so that a hanging portion for hanging from a predetermined metal fitting or another panel is formed at the upper end portion corresponding to one short side of the rectangle, and the hanging portion of the other panel is formed at the lower end portion corresponding to the other short side. It is configured to form a locking portion with which it engages.

The plurality of panels constituting the inner cylinder of the cyclone have a rectangular planar shape and are connected in the circumferential direction and the vertical direction. Corrosion of such panels is promoted by high-temperature exhaust gas, and the rate of progress is remarkable near both long sides of the rectangle of the panel. This is because there are three surfaces in contact with the exhaust gas in the vicinity of the long side, and the proportion of the area in contact with the exhaust gas is large. Therefore, the plate thickness near the long side becomes thin relatively early. Alternatively, the end faces of the long sides recede, and the gap between the two adjacent panels becomes large. Then, it is necessary to replace the panel at an early stage. According to the present invention, the rectangular panel is formed thicker in the vicinity of both long sides of the panel as compared with the central portion. Then, even if corrosion progresses in the vicinity of the long side, it takes a long time until the plate thickness becomes thin enough to require replacement. In addition, the speed at which the end face on the long side recedes can also be reduced. As a result, it is possible to suppress the expansion of the gap between the two adjacent panels. In the panel according to the present invention, the rate of corrosion progress near the long side can be substantially the same as the rate of corrosion progress in the entire panel, and the life of the panel can be substantially extended. .. The effect that the life of the cyclone inner cylinder composed of such a panel is inevitably extended can be obtained.

It is a front sectional view which shows the cyclone which concerns on this embodiment. It is a figure which shows the panel which concerns on this embodiment which comprises the cyclone inner cylinder, (A) is the perspective view of the panel, (B) is the sectional view of the panel cut by the XX cross section in (A), (C) is a partial cross-sectional view of a panel in which the portion of reference numeral Y in (B) is enlarged. It is a figure which shows the cyclone inner cylinder which concerns on this embodiment formed by the panel which concerns on this embodiment, (A) is the sectional view which shows a part of the cyclone inner cylinder, (B) is (A). It is a front view which shows a part of the cyclone inner cylinder seen from the direction of arrow Y1. In the figure which shows the conventional example, (A) is the perspective view of the conventional panel which constitutes a cyclone inner cylinder, (B) is a partial sectional view of the conventional cyclone inner cylinder which consists of a conventional panel, (C). Is a cross-sectional view of a panel cut in cross-section ZZ in (A), and (D) is a partial cross-sectional view of a panel in which the portion of reference numeral 60 is enlarged in (C).

Hereinafter, the present embodiment will be described. The cyclone 1 according to the present embodiment is a cyclone for forming a suspension preheater. As shown in FIG. 1, the cyclone 1 is roughly composed of a cyclone main body 2 and a cyclone inner cylinder 3 according to the present embodiment provided in the cyclone main body 2. The cyclone main body 2 is composed of a cylindrical portion 5 having a cylindrical shape, a tapered portion 6 connected below the cylindrical portion 5 to reduce the diameter, and a head portion 8 connected above the cylindrical portion 5. It is configured. A supply pipe 10 opened in the tangential direction is provided on the peripheral wall of the cylindrical portion 5. An underflow pipe 11 is provided below the tapered portion 6, and an exhaust pipe 13 is provided at the head portion 8.

Therefore, when the raw material powder such as cement and the exhaust gas from the kiln are supplied from the supply pipe 10, the raw material powder is heated by swirling in the cyclone main body 2 in a mixed state. Eventually, the raw material powder having a large specific density descends along the tapered portion 6 and is discharged from the underflow pipe 11 and sent to another cyclone constituting the suspension preheater or to the kiln. On the other hand, the exhaust gas having a small specific density is exhausted from the exhaust pipe 13 through the cyclone inner cylinder 3 according to the present embodiment described below, and is supplied to other cyclones constituting the suspension preheater or exhausted to the outside. Will be done.

The cyclone inner cylinder 3 according to the present embodiment is composed of a plurality of panels 15, 15, ... According to the present embodiment. The panel 15 according to the present embodiment can be made of any metal such as a heat-resistant alloy and stainless steel, and has a rectangular planar shape as shown in FIG. 2 (A).

In the panel 15 according to the present embodiment, a hanging portion 17 is formed at the upper end portion corresponding to one short side of the rectangle, and a locking portion 18 is formed at the lower end portion corresponding to the other short side. The hanging portion 17 has a structure for hanging on a metal fitting provided on the cyclone main body portion 2 or on another panel 15. The structure and shape of the hanging portion 17 can be arbitrarily configured as long as it can be hung. In the present embodiment, the hanging portion 17 has a shape of valley folds at two points parallel to the short side at substantially right angles, and its cross-sectional shape is hook-shaped. The tip of the hanging portion 17 is formed on the three claw portions 20, 20, 20, and the vicinity of the claw portions 20, 20, ... Is formed to be thick and reinforced.

The structure and shape of the engaging portion 18 is not limited to a specific structure and shape as long as other panels can be suspended. In the present embodiment, the engaging portion 18 has a shape in which the engaging portion 18 is valley-folded at two points parallel to the short side at substantially right angles like the hanging portion 17, and the cross-sectional shape thereof is a hook shape. Alternatively, the cross-sectional shape is formed like a pocket. Ribs 21 and 21 are formed in the engaging portion 18, whereby the inside of the engaging portion 18 is divided into three parts.

In the panel 15 according to the present embodiment, the XX cross section is shown in FIG. 2 (B), and the portion of reference numeral Y is enlarged in FIG. 2 (C). Has the greatest feature in its plate thickness. That is, the panel 15 is formed to have a predetermined plate thickness as a whole, but is formed to be thick in the vicinity of both long sides of the rectangle. That is, it is formed thick in the vicinity of the long side where corrosion progresses quickly. In the present embodiment, the plate thickness is formed so as to continuously increase from the vicinity of the long side of the rectangle toward the end face of the long side, but if the thickness is thick in the vicinity of the long side, The plate thickness may be gradually increased.

The cyclone inner cylinder 3 according to the present embodiment is assembled as follows. As shown in FIG. 1, a plurality of hanging metal fittings 23, 23, ... Are provided in the circumferential direction on the head portion 8 of the cyclone main body portion 2. As shown in FIGS. 3A and 3B, the hanging portions 17, 17, ... Are engaged with these metal fittings 23, 23, ..., And a plurality of panels 15, 15, ... Are arranged side by side. .. That is, a plurality of panels 15, 15, ... Are hung by arranging them in the circumferential direction. As a result, the first-stage cyclone inner cylinder 3a is configured.

Then, with respect to the plurality of panels 15, 15, ... Constituting the first stage, the plurality of panels are engaged with the locking portions 18, 18, ..., And the hanging portions 17, 17, ... Suspend 15, 15, ... At this time, any one panel 15, 15, ... Is suspended over any two adjacent panels 15, 15, ... Constituting the first-stage cyclone inner cylinder 3a. That is, one panel 15 is suspended over the two panels 15 and 15. As a result, the second-stage cyclone inner cylinder 3b is configured. Hereinafter, in the same manner, a plurality of panels 15, 15, ... Are suspended to form a cyclone inner cylinder 3 having a required number of stages. The cyclone inner cylinder 3 according to the present embodiment shown in FIG. 1 is composed of three stages, but may be composed of only one stage, two stages, or four or more stages. It may be.

In the cyclone inner cylinder 3 according to the present embodiment, in the lowermost stage, that is, in the third stage cyclone inner cylinder 3c, the locking portions 18, 18, ... Of the plurality of panels 15, 15, ... Are connected. That is, any two adjacent panels 15, 15, ... Are connected by connecting metal fittings 25, 25, .... This prevents the cyclone cylinder 3 from falling apart.

When the cyclone 1 according to the present embodiment is operated for a long period of time, the cyclone inner cylinder 3 is exposed to high-temperature exhaust gas for a long time. Then, the plurality of panels 15, 15, ... Constituting the Sacron inner cylinder 3 are corroded by the exhaust gas. In FIG. 2C, the corroded state is shown by a dotted line. Since the panel 15 is formed with a thick wall near both long sides where corrosion is likely to proceed, in other words, the vicinity of the end faces on both sides is formed with a thick wall, so that sufficient meat is formed even if corrosion progresses in this portion. The thickness is maintained. In addition, the amount of retreat of the end face indicated by reference numeral 27 is also small. Therefore, the gap between the adjacent panels 15, 15, ... Is difficult to widen, and the life of the panels 15, 15, ... And the cyclone inner cylinder 3 is extended.

An experiment was conducted to confirm that the cyclone inner cylinder 3 according to the present embodiment, which comprises the panels 15, 15, ... According to the present embodiment, has a longer life than the conventional cyclone inner cylinder.
Experiment content:
At a predetermined cement manufacturing plant, an actual operation test was conducted on an actual cyclone constituting the suspension preheater. In this cyclone, the cyclone inner cylinder is composed of a conventional panel having a uniform plate thickness. If this cyclone inner cylinder is operated under normal operating conditions, corrosion will progress in about one year and it will be necessary to replace it. In this cyclone, the cyclone inner cylinder 3 was formed by the panels 15, 15, ... According to the embodiment of the present invention, and operated under the same conditions for one year. When the corrosion state of the panels 15, 15, ... Was examined one year later, the progress of corrosion in the vicinity of both long sides was smaller than the progress of corrosion of the conventional panel, and replacement was not necessary. The amount of retreat on the end faces of both long sides of the panels 15 and 15 was 40% or less, assuming that the amount of retreat on the end faces of both long sides of the conventional panel was 100%. That is, the gaps between the plurality of panels 15, 15, ... Arranged in the circumferential direction in the cyclone inner cylinder 3 were hardly enlarged and did not need to be replaced.
Consideration:
It was confirmed that the cyclone inner cylinder 3 according to the present embodiment, which comprises the panels 15, 15, ... According to the present embodiment, has a longer life than the conventional cyclone inner cylinder.

1 Cyclone 2 Cyclone body 3 Cyclone inner cylinder 5 Cylindrical part 6 Tapered part 8 Head part 10 Supply pipe 11 Underflow pipe 13 Exhaust pipe 15 Panel 17 Suspended part 18 Locking part 18
20 Claws 21 Ribs 23 Metal fittings 25 Connecting metal fittings

Claims (4)

A plurality of panels having a predetermined plate thickness and a rectangular planar shape are connected in the circumferential direction and the height direction so that their short sides are up and down to form a cyclone inner cylinder. It is a panel for the cyclone inner cylinder configuration that is
The panel is a panel for a cyclone inner cylinder configuration, characterized in that the panel is formed thicker in the vicinity of the long sides of one side and the other side as compared with the central part. The panel according to claim 1, wherein a predetermined metal fitting or a hanging portion for hanging from the other panel is formed at the upper end portion corresponding to one short side of the rectangle, and the other short side is formed. A panel for a cyclone inner cylinder configuration, characterized in that a locking portion with which the hanging portion of the other panel is engaged is formed at a corresponding lower end portion. A cyclone inner cylinder formed by connecting a plurality of panels having a predetermined plate thickness and having a rectangular planar shape in the circumferential direction and the height direction so that their short sides are up and down. There,
The cyclone inner cylinder is characterized in that the panel is formed thicker in the vicinity of the long sides of one side and the other side as compared with the central part. The cyclone inner cylinder according to claim 3, wherein the panel is formed with a predetermined metal fitting or a hanging portion for hanging from the other panel at an upper end portion corresponding to one short side of a rectangle, and the other short side. A cyclone inner cylinder, characterized in that a locking portion with which the hanging portion of the other panel is engaged is formed at a lower end portion corresponding to a side.

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