JPH06101977A - Cyclone inner cylinder for suspension preheater - Google Patents

Abstract

PURPOSE:To obtain a cyclone inner cylinder for a suspension preheater which is capable of releasing strains induced by temperature changes and being assembled easily without producing a turbulent flow in the stream of exhaust gas. CONSTITUTION:A cyclone inner cylinder 10 consists of a plurality of components 11a and 11b and suspended and connected in the direction of circumference and height, thereby forming the inner cylinder with a specified size and height. Two hooks 12 are installed to the upper part of these components while two penetration holes 15 into which the hooks are inserted, are installed to the lower part. Extension edges 16 and 17, which are adjoined when assembled, are formed on both sides of the components. When the hooks 12 and the penetration holes 15 are connected to the components 11a and 11b in the circumferential direction, there are formed the adjacent extension edges 16 and 17 of the components, which are positioned in such a manner that they may stack with the components in a sliding manner and when they are connected in the height direction, they are installed to such a position that they may bridge and stretch over the both adjacent components on the upper stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cyclone of a suspension preheater in which a plurality of constituent elements are connected in a circumferential direction and a height direction to form a cyclone inner cylinder having a predetermined diameter and a predetermined height. It is about the cylinder.

[0002]

2. Description of the Related Art As is well known, a cement manufacturing apparatus has a rotary kiln. Then, the mixed raw material of finely crushed cement made of limestone, clay, silica stone, etc. is put into this rotary kiln, and, for example, 1450 ° C.
It is baked at a high temperature of the order. At this time, the temperature of the exhaust gas discharged from the rotary kiln reaches about 1000 ° C. Therefore, the mixed raw material supplied to the rotary kiln is preheated with this exhaust gas. A cyclone is generally used for this preheating. As is well known, the cyclone is roughly composed of a cylindrical main body and a tapered portion that is tapered from the main body. A cyclone inner cylinder is provided inside the main body. Therefore, when the mixed raw material and the exhaust gas are supplied to the cyclone, the mixture of the raw material and the exhaust gas swirls inside the cyclone body outside the cyclone inner cylinder, and the raw material having a large specific gravity is discharged from below the tapered portion, and the exhaust gas emits the cyclone inner cylinder. Is discharged from above through. During this period, the mixed raw material and the exhaust gas are separated, and heat is exchanged to preheat the raw material.

As described above, since the cyclone inner cylinder is provided inside the cyclone body, the separation of the mixture of the raw material and the exhaust gas is enhanced and the heat exchange rate is also improved, but the exhaust gas discharged from the rotary kiln is As mentioned above, it has a high temperature and also contains components that corrode metals. Therefore, the cyclone inner cylinder is bent from a rust-free steel plate into a cylindrical shape, and the ends are joined by welding to be integrated into a cylindrical shape. Alternatively, it is integrally formed by casting from a heat-resistant alloy. By the way, as described above, high heat is non-uniformly applied to the cyclone inner cylinder to generate thermal stress. However, since the cyclone inner cylinder is an integral structure, the thermal stress causes distortion, cracking and the like. In addition, there is a part where the temperature becomes abnormally high locally, and corrosion also occurs from this part. Then, although it must be replaced, the cyclone inner cylinder used in the cement manufacturing device has a diameter of 2600 to 4000 mm,
Since it has a height of about 2000 mm, the replacement of a single piece is a large-scale work using a hoisting machine or the like. It is also uneconomical because it must be replaced in its entirety despite being locally damaged.

Therefore, a split assembly type cyclone inner cylinder formed of constituent members divided in the circumferential direction and the height direction is
For example, it is proposed by Jpn. The constituent members described in this publication have joint portions formed at the upper and lower ends thereof, and both side portions are provided with vertically projecting flanges at portions located inside when assembled, and the flanges are provided with bolts. A hole for insertion is formed. Therefore, the tubular cyclone inner cylinder can be assembled by tightening the flanges of the adjacent constituent members with bolts in the circumferential direction and by suspending and connecting using the coupling portion in the vertical direction.

[0005]

Since the cyclone inner cylinder described above is of the split and assembled type, the problems with respect to strain, cracking, etc. due to thermal stress are improved to some extent as compared with the aforementioned integrated cyclone inner cylinder. ing. Further, since it is a split type, one component is relatively light, and it is recognized that it is relatively easy to carry it into the cyclone body and assemble it. Furthermore, it is recognized that the cyclone inner cylinder can be locally repaired or replaced. However, there are many problems in the above-mentioned split assembly type cyclone inner cylinder. For example, since the constituent members are integrated by bolting the flanges in the circumferential direction, thermal contraction in the circumferential direction cannot be absorbed, and problems such as distortion and cracks cannot be avoided. Moreover, since many bolts are used, there is a drawback that it is troublesome to assemble and disassemble. Further, since the flange is provided inside the cyclone inner cylinder and in the vertical direction, the flow of exhaust gas or hot air hits the flange at a right angle and the flow is disturbed, for example, a vortex is generated on the downstream side of the flange and the cyclone inner cylinder is generated. There is a spot on the inner surface of the body that receives localized abnormal heating. Even if the inner cylinder is made of a heat-resistant alloy at this point, material deterioration occurs and cracks occur.
And this crack may spread all over. Therefore, the present invention, while taking advantage of the split assembly type, can eliminate the strain due to the temperature change, that is, the cyclone inner cylinder that solves the conventional problems described above,
It is an object of the present invention to provide a cyclone inner cylinder of a suspension preheater that is easy to assemble and that does not disturb the flow of exhaust gas or hot air.

[0006]

In order to achieve the above object, the present invention provides a plurality of constituent elements connected in a circumferential direction and a height direction to form an inner cylinder having a predetermined diameter and a predetermined height. In the formed cyclone inner cylinder, a plurality of first engaging elements are provided in an upper part of the above-mentioned components which is located above when assembled, and a first engaging member is provided in a lower part located below. A second engaging element that engages with the mating element is provided, and a seal portion that slidably overlaps adjacent components when assembled is formed on both sides of the first and second engaging elements. Is connected in a position such that when the constituent elements are circumferentially connected by the first and second engaging elements, the seal portions of the adjacent constituent elements are slidably overlapped with each other and in the height direction. You can suspend it over both adjacent components in the upper row. It is provided in the Do not position.

[0007]

Since the present invention is constructed as described above,
First, for example, a mounting bracket is attached to the upper inside of the cyclone body. An engaging element that can be engaged with the first engaging element of the constituent element is also formed on this mounting bracket. Next, the first engagement element of the component is engaged with the engagement element of the mounting bracket to connect the components circumferentially. At this time, the first engagement element is
When the constituent elements are connected in the circumferential direction, the seal portions of the adjacent constituent elements are provided so as to slidably overlap each other, so that the seal portions formed on the side portions of the constituent elements overlap each other. . As described above, the suspension assembly of the upper component is completed, and the middle component is engaged with the upper component. At this time, since the first and second engaging elements of the constituent elements are provided at positions so as to be able to be suspended over both of the adjacent constituent elements in the upper stage when the constituent elements are connected in the height direction, When the first and second engaging elements are engaged, the middle-stage component is attached while the upper-stage adjacent components are constrained. By repeating this operation, the components in the middle stage are connected in the circumferential direction. Thereafter, similarly, the required number of steps are connected in the vertical direction, and the assembly of the cyclone inner cylinder having the predetermined diameter and the predetermined height is completed. After assembly, the cement mixture is preheated in the same way as a conventional cyclone. If necessary, disassemble and remove the cyclone inner cylinder by reversing the above procedure. Also, replace damaged or damaged components by the above procedure.

[0008]

The present invention can be implemented in various forms. For example, the cyclone inner cylinder is composed of a plurality of components, but these components can also be cast from a heat-resistant alloy.
At this time, it is desirable that the first and second engagement elements are integrally cast. However, instead of casting, it is also possible to perform sheet metal working from a non-rust steel plate. At this time, the hook, which is the engaging element, is attached by welding separately, and the through hole into which the hook is inserted is drilled. The first and second engagement elements can be implemented with hooks and through holes into which the hooks are inserted. The hook and the through hole are provided above and below the component, respectively, but since the hook and the through hole are relative, when the through hole is provided at the upper part of the component, the hook is provided at the lower part. However, the figure only shows an example in which the hook is provided at the upper part and the through hole is provided at the lower part. When connecting the components of the cyclone inner cylinder in the height direction, the second and subsequent stages are connected to the components of the upper stage, but a mounting bracket is applied to suspend the components of the uppermost stage. The mounting bracket can also be composed of divided elements similar to the components of the cyclone inner cylinder. Then, assembling and disassembling becomes easy. However, since the mounting bracket is provided at the upper position of the cyclone body where assembly is difficult, it is desirable to have a structure that does not require replacement. For example, the components of the cyclone inner cylinder applied to the uppermost stage may be extended upward, and the extended portion may protect the inner surface of the fitting. At this time, the constituent elements of the cyclone inner cylinder applied to the uppermost stage can be made thicker than other elements. The components are connected in the circumferential direction to form a cyclone inner cylinder having a predetermined diameter, but the components connected in the circumferential direction are
It is desirable to carry out with an even number. This is because the shape of the seal portions formed on both sides of the component becomes simple and the work of suspending the component becomes easy. In the embodiment shown in the drawings, the sealing portion is composed of flared edges that project circumferentially from both sides of the component, but instead of the flared edges, both sides of the component are tapered. It can also be cut off.

An embodiment of the present invention will be described below. Figure 1
Cyclone 1 according to the present embodiment, as shown in FIG.
Like the conventional cyclone, the external shape is a cylindrical portion 2 having a substantially tubular shape, a tapered portion 3 that is gradually reduced in diameter downward from the cylindrical portion 2, and a cylindrical portion 2 that is connected above the cylindrical portion 2. A discharge pipe 4 and a supply pipe 5 that is open tangentially to the peripheral wall of the cylindrical portion 2 are provided. The cyclone inner cylinder 10 is suspended from above inside the cylindrical portion 2. Therefore, when the exhaust gas and the cement raw material are supplied from the supply pipe 5 in the arrow direction, the mixture thereof swirls inside the cylindrical portion 2 and in the outer space of the cyclone inner cylinder 10. In this process, the raw material having a large specific gravity descends along the inner wall of the tapered portion 3 and is discharged from the underflow pipe 6 to, for example, a rotary kiln. On the other hand, the exhaust gas having a small specific gravity is supplied from the cyclone inner cylinder 10 through the discharge pipe 4 to, for example, the cyclone in the next stage. In this way
The raw material is preheated. Such cyclones are provided in multiple stages.

FIG. 2A is a front view of the components of the cyclone inner cylinder 10 partially assembled and seen from the inside of the cyclone inner cylinder 10. FIG. 4A is an arrow A-- in FIG. Although it is a cross-sectional view as seen in the direction A, as shown in these figures, the constituent elements of the cyclone inner cylinder 10 are two types of first and second irrespective of the position where they are suspended in this embodiment.
It is composed of the components 11a and 11b. That is, the first and second components 11a and 11b are different only in the structure of the seal portions S on both sides, and the other parts have the same structure and the same size. First and second components 11
Each of a and 11b has a substantially rectangular shape when viewed from the front, and has a circular arc shape in plan view as shown in FIG.
And above these components 11a, 11b,
As shown in FIG. 2, two hooks 12, 12 protruding outward and facing downward are provided at a distance L1. The distance L1 between the hooks 12 and 12 is also equal to the distance Lt between the hooks 12 adjacent to each other when the hooks 12 are assembled by being suspended in the circumferential direction, as shown in FIG.
At the lower part of the first and second components 11a and 11b, a step 13 is formed which is radially outwardly protruded by approximately the same dimension as the thickness of the components 11a and 11b. That is, the expanded diameter portion 14 is formed in the lower portion of the components 11a and 11b. Then, the enlarged diameter portion 14 is provided with a through-hole 1 which is directed obliquely downward.
Two 5 and 15 are provided. These through holes 15, 1
The spacing L2 of 5 is also the same as the spacing L1 of the hooks 12, 12, and this spacing L2 is the first and second components 11 as well.
When assembling a and 11b by suspending them in the circumferential direction, it is also equal to the distance Lh from the adjacent through hole 15.

Both side portions of the first and second constituent elements 11a and 11b constitute a seal portion S. That is, both sides of the first constituent element 11a located on both sides in FIG. 4 are cut out from the inside by a predetermined width and a predetermined depth, and overhanging edges 16, 16 projecting outward in the circumferential direction are formed. Both sides of the second component 11b located in the center are similarly cut out on the outside, and are formed with overhanging edges 17, 17 projecting in the circumferential direction on the inside. These overhangs 16, 1
The thickness of 7 is about half the thickness of the components 11a, 11b. Therefore, the first and second components 11a and 11b
Are alternately assembled in the circumferential direction, the protruding edges 16 and 17 engage with each other inward and outward, and the first and second components 11a and 11
The inner and outer surfaces of b are substantially flush with each other.

The mounting member 20 for suspending the first and second components 11a and 11b is also composed of a plurality of suspension elements 21, which are divided as shown in FIGS. . The hanging element 21, also has through holes 22, 22 into which the hooks 12, 12 of the first and second constituent elements 11a, 11b are inserted, and the through holes 15, 22 of the constituent elements 11a, 11b.
It is formed in the portion 23 whose diameter is expanded to the same interval L1 as 15. Further, a flange 24 for fixing to the cylindrical portion 2 of the cyclone 1, a rib 25 for reinforcement, and the like are integrally formed on the outside of the hanging element 21.

Next, the operation of the above embodiment will be described.
First, the suspension elements 21, ... Are mounted above the cylindrical part 2. The partially attached state is shown in FIGS. The cyclone inner cylinder 10 has a diameter of 2 as described above.
Since it reaches 600 to 4000 mm, a person enters inside and suspends in the following manner. That is, first of all the upper part U, the first components 11a, 11a with the flared edges 16, 16 on the outside, every other hook as shown in FIG. 21 through holes 2
Suspend by inserting into 2, 22. Then the second component 11b, 11b with the overhanging edges 17, 17 inside
The first component 11a, 1 which has already been hung
In the same manner, the space between 1a is filled and suspended. Then, since the intervals between the hooks are L1 and Lt, the seal portion S of the first and second components 11a and 11b is
The overhanging edges 16, 17 of one another overlap and slidably engage each other, as shown in FIG. First component 1
Although the overhanging edges 16 and 16 of 1a are formed on the outside,
First, the first component 11a and the second component 11b
It is easy to hang because it hangs after the part where it is hung. When suspending the second component 11b, the overhanging edges 16, 17 of the seal S overlap one another, as shown in FIG. 4, but the overhanging edge 17, of the second component 11b, Since 17 is formed on the inner side, the projecting edges 17, 17 do not hinder the suspending work. Also, the through hole 2 of the hanging element 21 ,.
2 and 22 are formed in the enlarged diameter portion 23, and both the through holes 22 and 22 and the hooks 12 and 12 of the first and second components 11a and 11b face downward, so that the suspension element 21, the surface of the expanded portion 23 of the
The surface of the upper part of 1a, 11b has the components 11a, 11b.
The first and second components 11a and 11b that are hung from each other and act in close contact with each other face substantially the vertical direction. Therefore, the hanging operation is easy.

The next middle stage M is similarly suspended and assembled. At this time, the interval L1 between the hooks 12 and 12 of the first and second components 11a and 11b and the adjacent component 11
The intervals Lt between the hooks 12 and 12 of a and 11b are equal,
This interval L1 is further determined by the first and second components 11a, 1
Since the distance L2 between the through holes 15 and 15 of 1b and the distance Lh between the through holes 15 and 15 of the adjacent constituent elements 11a and 11b are equal, the first and second constituent elements 11 of the upper stage U
The first and second constituent elements 11 of the middle stage M straddling a and 11b.
The a and 11b are suspended from the first and second components 11a and 11b of the upper stage U as described above. When suspended in this manner, the first and second components 11a, 11 of the upper stage U are
The seal portion S of b is the first and second components 11a of the middle stage M,
It comes to the center of 11b. As a result, the movement of the first and second components 11a and 11b of the upper stage U is restricted. In the same way, suspend the required number of steps and assemble. At this time as well, it is clear that the constituent elements 11a and 11b face the substantially vertical direction.

Finally, as shown by the chain line in FIG. 2, the lower ends of the first and second components 11a and 11b adjacent to each other are connected by the connecting fitting 30 to complete the assembly. In addition,
The connecting fitting 30 includes hooks 1 of the components 11a and 11b.
Since the hooks 31 are formed to have the same size and the same interval as those of 2 and 12, the hooks 31 are used for connection. Clearly, the reverse procedure can be used for removal.

According to this embodiment, various effects can be obtained.
For example, the seal portion S of the first and second components 11a and 11b
Is composed of the projecting edges 16 and 17, the components can be easily suspended and assembled. That is, when a person enters the inside of the cyclone inner cylinder 10 to assemble it,
Finally, when the second components 11b, 11b are suspended from the inside and a person is assembled on the outside to assemble, the suspension work is facilitated by suspending the first components 11a, 11a from the outside at the end. . Further, in the assembled state, the overhang edges 16 and 17 overlap each other, so that the sealing effect is high. Also, since they are slidably overlapped with each other, the stress due to heat can be released. The through holes 22 and 22 of the mounting member 20 and the through holes 15 and 15 of the first and second components 11a and 11b are respectively formed in the enlarged diameter portions 23 and 14 so as to face obliquely downward, and the components 11
Since the hooks 12 and 12 of a and 11b are also directed diagonally downward, when the components 11a and 11b are suspended, the components 11a and 11b are oriented in the vertical direction, and the suspension assembly is easy and the diameter is increased. The surface in the vicinity of the portions 23, 14 and the surface in the vicinity of the hooks 12, 12 are in close contact with each other, and there is also an effect that there is no leakage of exhaust gas. Further, since the through holes 15 and 22 are formed in the expanded diameter portions 14 and 23, the constituent elements 11a and 11b are suspended, and the cyclone inner cylinder 10 is suspended.
When the above is formed, the inner peripheral surface of the cyclone inner cylinder 10 becomes substantially the same surface, and the gas flow is not disturbed. According to this embodiment, the first and second components 11a and 11 which are adjacent to each other
Since the lower end portion of b is connected by the connecting fitting 30, the constituent elements 11a and 11b sway in the radial direction during operation, and the seal portion S does not open abnormally or cross.

[0017]

As described above, according to the present invention, the cyclone inner cylinder has a plurality of constituent elements connected in the circumferential direction and the height direction, and is formed to have a predetermined diameter and a predetermined height. No matter which direction the heat stress occurs, it can be absorbed, and the component will not be distorted or cracked. A plurality of first engaging elements are provided in an upper portion of the component that is located above when assembled, and a second engaging element that engages with the first engaging element is provided in a lower portion located below the component. Elements are provided, but these first and second engagement elements are arranged at positions such that the seal portions of the adjacent components slidably overlap each other when the components are connected in the circumferential direction. When they are connected in the height direction, they are provided at positions so that they can be suspended over both of the adjacent upper components, so that the first and second engaging elements are used to form the components. When engaged in the circumferential direction, the seal portions of adjacent components are slidably superposed on each other and sealed. Further, when connected in the height direction, the constituent elements in the upper stage are suspended by the constituent elements in the lower stage, so that the movement is restricted by the constituent elements in the lower stage. Therefore, the connection strength in the circumferential direction becomes large, the constituent elements do not sway during operation, there is no troublesome bolt tightening as in the past, and the suspension assembly can be easily performed and the disassembly is easy. . Moreover, since there is no conventional flange inside the cyclone inner cylinder, the exhaust gas is not disturbed. Further, according to the present invention, the cyclone inner cylinder is composed of a plurality of constituent elements, but since the seal portions of the adjacent constituent elements are slidably overlapped with each other and sealed, the stress due to heat is Since it can be absorbed even if it occurs in the direction of, and no distortion or cracking occurs in the constituent elements, there is also an effect that there is no pressure loss due to a short path of exhaust gas.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of components, (a) is a front view as seen from the inside of a cyclone inner cylinder, and (b) is a cross-sectional view as seen in the direction of arrow BB in (a). Is.

FIG. 3 is a plan view seen from the direction of arrow C in FIG.

FIG. 4 is a cross-sectional view as seen in the direction of arrow AA in FIG.

[Explanation of symbols]

1 cyclone 10
Cyclone inner cylinder 11a, b First and second components 12
Hook 13 Through hole 16, 17
Overhang edge S seal part

Claims (2)

[Claims] 1. A cyclone inner cylinder in which a plurality of constituent elements are connected in a circumferential direction and a height direction to form an inner cylinder having a predetermined diameter and a predetermined height, the assembly of the constituent elements. The plurality of first engaging elements are provided in the upper portion located above when being pulled, and the second engaging element that engages with the first engaging element is provided in the lower portion located below. At the same time, a seal portion is formed on both sides so as to slidably overlap the adjacent constituent elements when assembled, and the first and second engaging elements are the first and second constituent elements.
When connected in the circumferential direction by the engaging element, the seal parts of the adjacent components are slidably overlapped with each other, and when connected in the height direction, the upper adjacent components are A cyclone inner cylinder of a suspension preheater, which is provided at a position where it can be suspended over both sides. 2. The cyclone inner cylinder of the suspension preheater according to claim 1, wherein the first engaging element is a hook and the second engaging element is a through hole.