JPH0755363A - High-temperature gas duct - Google Patents

Abstract

PURPOSE:To produce a big cooling effect with a small amount of water by a method wherein an outer tube is provided with a pocket, opened so as to have an area enough to introduce the discharged amount of water from a spray nozzle with respect to a space, at the lower part thereof while the pocket is provided with a water discharging port at the lower part of the same. CONSTITUTION:Cooling water, sprayed against an inner tube 28 in a slanted duct 4, flows down along the outer surface of the inner tube 28 or is collected by an outer tube 29 and is brought to the lower part of the same, then, enters a pocket 35 through a communicating port 36. In this case, cooling water in an upper part 6a does not flow down along the outer surface of the inner tube 52b whereby the amount of water, which flows down along the outer surface of the inner tube 52b, is comparatively small and the thickness of the water film thereof is comparatively thin. Accordingly, the cooling water, sprayed from the spray nozzle 69 in the lower part of the inner tube 52b, is collided surely against the outer surface of the inner tube 52b whereby a specified big cooling effect can be developed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot gas duct used for guiding hot gas.

[0002]

2. Description of the Related Art As a hot gas duct of this type, a recumbent inner cylinder for passing a high temperature gas, a recumbent outer cylinder surrounding the inner cylinder with a cooling space therebetween, and the inner cylinder. There is a plurality of spray nozzles arranged in the space for spraying cooling water on the outer surface thereof, and a cooling water drain port is provided in the lower portion of the outer cylinder. In some cases, the inner cylinder and the outer cylinder are oriented vertically.

In these high-temperature gas ducts, when the high-temperature gas is passed through the inner cylinder, the peripheral wall of the inner cylinder can be cooled, and it can be protected from damage due to heat and have a long life. Moreover, since the above cooling can be performed by spraying fine water droplets from the spray nozzle onto the outer surface of the inner cylinder, a large cooling effect can be achieved with a small amount of water. Furthermore, the cooling water after spraying can be collected by the outer cylinder and drained from the drain port at a certain place, so that the treatment is easy.

[0004]

In this conventional high temperature gas duct, in the former case, all the cooling water after spraying gathers in the lower part of the outer cylinder and is discharged from the drain port there. If the spray nozzle is arranged near the inner surface of the lower part of the outer cylinder, the spray nozzle will be submerged in the collected cooling water and the cooling water cannot be sprayed, and the cooling effect will be reduced. It was

In the latter case, if the inner cylinder and the outer cylinder are long,
After being sprayed on the outer surface of the inner cylinder, the amount of water flowing down along the outer surface of the inner cylinder becomes extremely large in the lower part, and the water film there becomes thicker. There was a problem that the cooling effect deteriorates without being sprayed.
In order to solve this problem, in the applicant company, the space between the inner cylinder and the outer cylinder is divided into upper and lower parts by partition walls, and it is attempted to discharge the cooling water from the lower part of each space to the outside of the outer cylinder. It was By doing so, the water film of the cooling water on the outer surface of the inner cylinder can be thinned even in the lower section, and the cooling can be favorably performed by spraying water. However, since water must be discharged in each of the above sections, many pipelines must be laid to guide the discharged water,
There is a problem that the appearance becomes unsightly and a great deal of time and labor is required for laying the pipeline.

The present invention has been made in order to solve the above-mentioned problems (technical problems) of the prior art. A large cooling effect can be obtained with a small amount of water, and the presence of an outer cylinder is effective for cooling. The water can be easily treated after it has been heated, and even if it has an outer cylinder, it can prevent the spray nozzle from submersing in water and can maintain a stable cooling effect. It is also an object of the present invention to provide a high temperature gas duct which has a high cooling effect, has a good appearance, and can facilitate the work of laying a pipeline.

[0007]

In order to achieve the above object, a high temperature gas duct in the present invention has a recumbent inner cylinder for passing a high temperature gas and a cooling space around the inner cylinder. A reclining outer cylinder surrounding the inner cylinder and a plurality of spray nozzles arranged in the cooling space for spraying cooling water on the outer surface of the inner cylinder are provided, and cooling water is drained to a lower portion of the outer cylinder. In a high temperature gas duct provided with a mouth, the structure of the arrangement of the drainage port has an area large enough to introduce the amount of water discharged from the spray nozzle into the space in the lower portion of the outer cylinder. Is provided with a pocket that opens, and the drain port is provided at the bottom of the pocket. The hot gas duct in another invention of the present application is
A vertically oriented inner cylinder for passing high-temperature gas, a vertically oriented outer cylinder surrounding the inner cylinder with a cooling space between them, and the cooling for spraying cooling water on the outer surface of the inner cylinder. In a high temperature gas duct having a plurality of spray nozzles arranged in a space, and a cooling water drain port being provided in a lower portion of the outer cylinder, the space is provided between the inner cylinder and the outer cylinder. The partition wall is divided into a plurality of upper and lower parts, and the partition wall has a water passage hole for dropping the cooling water in the upper space to the lower space, and the cooling water from the outer surface of the inner cylinder of the lower space. It is provided at a position away from the outer surface of the inner cylinder in order to drop it to a distant position.

[0008]

Since the water droplets are sprayed from the spray nozzle onto the inner cylinder, the inner cylinder can be cooled and protected from heat with a small amount of water. The water sprayed on the inner cylinder and cooled by it is collected by the outer cylinder, enters the large opening pocket, and is drained from the drain port there. In the case where the hot gas duct is vertical, the water that has traveled down the outer surface of the inner cylinder in the upper section passes through the water passage holes in the partition wall and falls into the space in the lower section. Therefore, the water film that travels down the outer surface of the inner cylinder is kept thin in the lower section, and cooling can be effectively performed by the cooling water sprayed there.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is an arc furnace shown as an example of equipment for generating high-temperature gas, and 2 and 3 are well-known members for guiding the high-temperature gas discharged from the arc furnace 1, which are a furnace top elbow and a sliding duct, respectively. Show each. Reference numerals 4 and 4 denote inclined ducts shown as an example of the high temperature gas duct, 5 a gate valve, and 6 a combustion tower shown as another example of the high temperature gas duct.

The arc furnace 1 has a well-known structure.
Is a furnace bottom, the upper surface of which is made of refractory bricks 9, and a well-known tap hole 10 is provided at a part of the position unevenly distributed from the center. Reference numeral 11 is a furnace wall, for example, a water-cooled furnace wall. Reference numeral 12 denotes a furnace lid, which has an electrode insertion port 13 and a gas discharge port 14 and has a water cooling structure. For example, 15 is the inner wall, 16 is the cooling space 17
An outer wall 18 separated by a plurality of nozzle branch pipes 18 is connected to a header pipe (not shown). Reference numeral 19 denotes a large number of spray nozzles, and 20 denotes a drain port provided in a part of the outer wall 16. In the water-cooled furnace lid having such a structure, the cooling water is sprayed from the spray nozzle 19 onto the upper surface of the inner wall 15 as fine water droplets to cool the cooling water, and the sprayed cooling water is cooled to the inner wall 15
It flows down along the upper surface of and is discharged from the drainage port 20. Reference numeral 21 is a well-known arc electrode.

Next, the furnace top elbow 2 has a water cooling structure, 23 is an inner cylinder through which a high temperature gas is passed, 24 is an outer cylinder around which a cooling space is provided, and 25 Is the inner cylinder
Multiple spray nozzles for spraying cooling water on 23,
Reference numeral 26 denotes a drain port provided in a part of the outer cylinder 24 for cooling water after being blown out from the nozzle 25 and used for cooling the inner cylinder 23.
It is designed to be discharged into the cooling space 17 of.

Next, the above-mentioned inclined duct 4 will be described with reference to FIG. 2 showing a part of it in detail. 28 is a recumbent inner cylinder for passing a high-temperature gas, and is made of a steel plate having a diameter of, for example, 1500 mm according to the amount of gas to be passed. Recumbent inner cylinder 28
The degree of inclination of the horizontal axis varies from about 45 °, which is larger than that shown, to horizontal. Reference numeral 29 denotes a recumbent outer cylinder that surrounds the inner cylinder 28 with a cooling space 30 in between and is made of, for example, a steel plate, like the inner cylinder 28. The width W of the cooling space 30 is preferably large in that the cooling water blown out from the spray nozzle described later is sufficiently spread and sprayed on the inner cylinder 28, and the diameter of the outer cylinder 29 is made as small as possible. The smaller the size, the better, and it is better to decide the balance between the two. For example, it is about 250 mm. Reference numeral 31 is a flange for connecting the ducts 4 to each other, and the entire circumference is welded to the inner cylinder 28 and the outer cylinder 29 in order to prevent water leakage from the cooling space 30. 31a is a packing for preventing gas leakage from the space in the inner cylinder 28.

Next, a structure for spraying cooling water on the inner cylinder 28 will be described. A header pipe 32 is connected to a water supply pipe (not shown). Reference numeral 33 denotes a nozzle branch pipe connected to the header pipe 32. A plurality of nozzle branch pipes are arranged around the inner cylinder 28, and each of the inner cylinders has the above-mentioned inner cylinder.
A plurality of spray nozzles 34 for spraying cooling water are attached to the outer surface of 28. The arrangement of the plurality of spray nozzles 34 is such that the outer surface of the inner cylinder 28 is such that the water droplets blown out from each spray nozzle 34 are sufficiently spread, and the entire outer peripheral surface of the inner cylinder 28 is covered by the water droplets. It is preferable to dispose them as far as possible and to arrange them evenly over the entire cooling space 30.

Next, 35 is a pocket for promptly receiving the cooling water in the outer cylinder 29 so that the water level of the cooling water in the outer cylinder 29 does not rise. It is attached to the lower portion 29a and opens to the cooling space 30 with a large opening area. For example, as shown in the figure
The outer cylinder 29 and the flange 31 are attached to the outer cylinder 29 and the flange 31 by welding in a state of surrounding the communication port 36 formed in 29 so as to prevent water leakage.
The area of the communication port 36 is an area large enough to introduce the amount of water discharged from the spray nozzle 34 in order to promptly receive the cooling water, for example, the spray nozzle 34 sprays the inner cylinder 28. After that, the cooling water collected by the outer cylinder 29 has an area such that it can be introduced into the pocket 35 without being held in the outer cylinder 29. 37 is a drain port provided at the bottom of the pocket 35, for example, on the bottom surface thereof so that most of the space in the pocket 35 can be used for temporarily receiving water, and a drain pipe 38 is connected to the drain port 37. The drain pipe 38 is designed to allow the cooling water to be naturally drained to, for example, a water collecting pit, and has a pipe diameter such that the maximum internal flow velocity of the cooling water is 1.5 m / sec.

Next, the sluice valve 5 has a well-known structure, 41 is a vertically movable valve element, 42 is an opening / closing device thereof, 43 is a hanging rope connected to the valve element 41, and 44 is a hoisting rope 43. Pulleys for, 45
Are motors for rotating the pulley 44, respectively.

Next, the combustion tower 6 will be described. 48 is a high temperature gas inlet, 49 is an exhaust port, 50 is a dust outlet, and a door 51
Equipped with. Since the combustion tower 6 is long in the vertical direction, the upper part
6a and the lower part 6b are divided into two parts, and both parts 6a,
6b is connected by flanges 62 and 63. The configuration may be divided into a larger number. Such a structure is adopted, for example, in order to clear the transportation limit. Next, both parts 6
It will be described with reference to FIG. 3 which shows the structure in the vicinity of the connecting portions of a and 6b in detail. 52a and 52b are vertically oriented inner cylinders for passing a high temperature gas, and are formed to have a size sufficient to exhibit the function of a combustion tower. Reference numerals 53a and 53b denote vertically oriented outer cylinders surrounding the inner cylinders 52a and 52b with cooling spaces 54a and 54b, respectively. The outer cylinders 53a and 53b and the cooling spaces 54a and 54b.
The size of is set in the same manner as the case of the duct 4 in the previous term. Reference numeral 55 denotes a ceiling that closes the upper end of the space inside the inner cylinder 52a, and is formed in a camp shape so that the water can flow down favorably in the radial direction. Reference numeral 56 denotes a closing member that closes the upper end of the outer cylinder 53a, and is provided on the ceiling 55 with a cooling space 57 that communicates with the cooling space 54a. Reference numeral 58 is a member that closes the lower end of the cooling space 54b and also functions as a seat for the door 51, and is formed in an annular shape according to the shape of the lower end of the space 54b. Reference numeral 59 denotes a cooling water drainage port provided at a lower portion of the outer cylinder 53b, to which a drainage pipe 60 is connected. This drain pipe 60 is also constructed similarly to the drain pipe 38.

The flange 62 is an inner cylinder in the upper portion 6a.
It is watertightly welded to the outer circumference 52a and the outer cylinder 53a over the entire circumference so that no water leaks from the cooling space 54a in the upper portion 6a. The flange 63 has a similar structure to the lower portion 6b. 64 is a packing for preventing leakage of gas from between the flanges 62 and 63. Reference numeral 65 denotes a partition wall for partitioning the upper and lower cooling spaces 54a and 54b from each other, and the flanges 62 and 63 are used as an example.
Two or more partition walls may be provided to divide into three or more cooling spaces. Reference numeral 66 is a water passage hole provided in the partition wall 65 for dropping the cooling water in the upper cooling space 54a into the lower cooling space 54b, and the cooling water is the outer surface 52b of the inner cylinder 52b in the lower space 54b. '
The inner cylinder to drop it away from the outer surface 52b 'so that it does not touch the
It is provided at a position apart from the outer surface of 52b, for example, in the middle between the inner cylinder and the outer cylinder as shown in the figure (a position closer to the outer cylinder may be used), and cooling water is provided on the outer surface of the inner cylinder 52b in the lower section. A guide tube 67 is attached to ensure that it is not touched. In order to prevent water from accumulating on the partition wall 65, the water passage holes 66 may be provided at, for example, three places in the circumferential direction of the inner cylinder 52a as shown in FIG. Each water passage hole 66 is located so as not to interfere with the water sprayed from the spray nozzle 69 in the lower cooling space 54b, so that the water dropped therefrom does not interfere with the place where the spray water will exist. It is provided in.

Next, the structure for spraying the cooling water on the inner cylinders 52a, 52b provided in the cooling spaces 54a, 54b is the same as the structure in the duct 4, 68 is a nozzle branch pipe, and 69 is the above. A plurality of spray nozzles for spraying cooling water on the outer surfaces of the inner cylinders 52a, 52b are shown. Next, the structure for cooling the ceiling 55 is also the same, 70 is a nozzle branch pipe, and 71 is a plurality of spray nozzles. Next, in FIG. 5 showing the configuration of the peripheral portion of the ceiling 55, 74 and 75 are guide members for dropping the cooling water flowing down the upper surface of the ceiling 55 into the space 54a at a position apart from the outer peripheral surface of the inner cylinder 52a. , Is provided around the periphery of the ceiling 55. The guide member 75 may be formed in a water channel shape, and a through hole for dropping water may be provided at a position corresponding to the water passage hole 66.

In the structure described above, the high temperature gas generated by the operation of the arc furnace 1 is discharged from the discharge port 14, and the furnace top elbow 2, the sliding duct 3, the inclined duct 4, and the sluice valve 5 are discharged. Through it reaches the combustion tower 6. And combustion tower 6
Exhaust gas discharged from the exhaust port 49 of the exhaust gas reaches the dust collector. In the above-mentioned case, the cooling water is sprayed from the spray nozzles in the respective parts in the form of fine water droplets on the inner wall 15 and the inner cylinders 23, 29, 52.
It is sprayed on a, 52b, the ceiling 55, etc. to cool each.
The cooling water that has been sprayed onto the inner cylinder 28 in the inclined duct 4 flows down along the outer surface of the inner cylinder 28 or is collected by the outer cylinder 29 to reach the lower portion thereof, and from the communication port 36 to the pocket 35. Get in Then, it is discharged from the drain port 37, and the drain pipe 38
Through to the water collection pit. Upper part of combustion tower 6
In 6a, the cooling water sprayed on the inner cylinder 52a there is
It flows down along the outer surface 52a 'and reaches the partition wall 65. Then, the cooling water flows from the water passage 66 to the cooling space 54 of the lower portion 6b.
fall to b. Also in the lower part 6b, the inner cylinder 52b there
The cooling water sprayed on the water flows down along the outer surface 52b '. In this case, since the cooling water of the upper portion 6a does not flow down to the outer surface of the inner cylinder 52b, the amount of water flowing down the outer surface of the inner cylinder 52b is relatively small and the thickness of the water film is relatively thin. . Therefore, the spray nozzle 69 is also provided below the inner cylinder 52b.
The cooling water sprayed from the nozzle reliably hits the outer surface of the inner cylinder 52b and exerts a predetermined large cooling effect. The cooling water that has reached the drainage port 59 in the lower portion 6b is discharged through the drainage pipe 60.

Next, FIG. 6 shows a different embodiment of a recumbent hot gas duct, showing a hot gas duct in which the inner cylinder rotates. In the figure, the inner cylinder 28e and the outer cylinder 29e are inclined at a slight angle θ with respect to the horizontal, and the former is rotatably supported by the support mechanism 107 while the latter is fixedly supported. Regarding the relationship between the inner cylinder 28e and the outer cylinder 29e, 110 and 111 are flanges for supporting the inner cylinder 28e by the support structure 107 and fixed to the outer circumference of the inner cylinder 28e.
It is made to project to the outside through a housing 112 provided around 29e. Reference numerals 113 and 114 are tires mounted around the respective flanges 110 and 111. Reference numeral 115 is a seal member that seals between the flanges 110 and 111 and the edge of the housing 112 in a watertight manner. 117 is a driven gear attached to the tire 114. Next, the support mechanism 107 will be described. 120 is a support,
Reference numerals 121 and 122 denote rotatable support wheels provided thereon, on which the tires 113 and 114 are mounted, respectively. The wheel 122 has a collar 123 for receiving the thrust of the inner cylinder 28e. Reference numeral 124 is a motor for rotationally driving the inner cylinder 28e, 125 is a drive speed reducer connected to the rotary shaft of the motor 124, 126 is a drive pinion gear connected to the output shaft of the drive speed reducer 125, and is the driven gear.
It meshes with 117. In this example, the wheel 122 and the drive gear 126 are mounted on the same shaft body, but they may be mounted on separate shaft bodies. 127 is a support body for supporting the outer cylinder 29e. In the case of the above-mentioned structure, the outer cylinder 29e is divided into the flanges 110 and 111, and each range is defined as one section for spraying the cooling water indicated by reference numerals 32e to 38e and draining the cooling water after the spraying. The above structure is provided, and the submerged nozzle 34e is prevented from being submerged in each section.

In the above structure, when the high temperature gas is passed through the inner cylinder 28e, the inner cylinder 28e is actuated by the operation of the motor 124.
Is rotated. Therefore, even if dust is mixed in the above-mentioned high temperature gas and falls into the inner cylinder 28e, the dust remains in the inner cylinder.
As 28e rotates, it moves sequentially to the lower side which is in an inclined state and is discharged from the end of the inner cylinder 28e, so that it does not accumulate in the inner cylinder 28e. In addition, parts that are considered to be the same or equivalent in configuration to those in the previous figure in terms of function are denoted by the same reference numerals as those in the previous figure with the letter e added to omit redundant description.
(Also, in the following figure, the same letter is added to the letter "f" to omit the duplicated explanation.)

Next, FIG. 7 shows another example of the pocket structure. The pocket 35f has a sectional structure as shown in the figure and is formed to be long over the entire length of the outer cylinder, and has an extremely wide communication port 36f having a length over the entire length of the outer cylinder 29f with respect to the cooling space 30f. It is open at. With such a structure, the cooling water collected by the outer cylinder 29f is
Immediately at any position in the longitudinal direction of f, the pocket 35f
Since it can enter, it is possible to reliably prevent the lower spray nozzle in the outer cylinder 29f from being submerged.

[0023]

As described above, according to the present invention, the inner cylinder
When high-temperature gas is passed through 28, the peripheral surface of the inner cylinder 28 can be cooled, and there is an effect that it can be protected from damage due to heat and the life can be extended.

Moreover, since the above cooling can be performed by spraying fine water droplets from the spray nozzle 34 onto the outer surface of the inner cylinder 28, there is a feature that a large cooling effect can be achieved with a small amount of water.

Moreover, even in the case of spraying water droplets as described above, the cooling water after spraying can be collected by the outer cylinder 29 and drained from the drain port 37 at a certain place, so that the treatment is easy. There is.

Further, even if the cooling water after spraying is collected by the outer cylinder 29, it is sufficient to introduce the amount of water sprayed from the spray nozzle 34 into the space 30 in the outer cylinder at the lower portion of the outer cylinder 29. Since the pocket 35 that opens in a large area is attached, the cooling water has a feature that it can be guided to the pocket 35 promptly (without stagnation in the outer cylinder 29).
This means that even if the spray nozzle 34 is disposed near the inner surface of the lower portion of the outer cylinder 29, the spray nozzle 34 can be prevented from being submerged in water and the cooling by spraying the water droplets can be performed without any trouble. Has utility.

When the inner cylinder 52 is vertically long, the cooling space 54 between the inner cylinder 52 and the outer cylinder 53 is vertically divided into a plurality of spaces, and the cooling water flowing down the outer surface of the inner cylinder 52a in the upper space 54a is Space 54b
First, first, in the upper space 54a, water droplets can be sprayed from the spray nozzle 69 for efficient cooling, and secondly, in the lower space. Even in the space 54b, the water film of the cooling water on the outer surface of the inner cylinder 52a can be made thin, and cooling can be effectively performed by spraying water droplets from the spray nozzle 69 on the outer surface of the inner cylinder. , Third
In addition, even if the spaces 54a and 54b are vertically divided into a plurality of spaces as described above, the structure in which the cooling water is discharged from the upper space 54a is not visible from the outside, so the appearance is good, and the upper space is There is an advantage that the laying work of the pipeline for guiding the drainage as in the above-mentioned prior art can be made unnecessary.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a system through which high-temperature gas passes.

FIG. 2 is an enlarged sectional view of a II portion in FIG.

FIG. 3 is an enlarged sectional view of a portion III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an enlarged view of a V portion in FIG.

FIG. 6 is a cross-sectional view showing another embodiment of a recumbent hot gas duct.

FIG. 7 is a partial sectional view showing an embodiment having a different pocket structure.

[Explanation of symbols]

 28,52 Inner cylinder 29,53 Outer cylinder 30,54 Cooling space 34,69 Spray nozzle

Claims (2)

[Claims] 1. A recumbent inner cylinder for passing a high-temperature gas,
A recumbent outer cylinder surrounding the inner cylinder with a cooling space therebetween, and a plurality of spray nozzles arranged in the cooling space for spraying cooling water on the outer surface of the inner cylinder, In a high temperature gas duct in which a cooling water drainage port is provided in the lower part of the outer cylinder, the structure of the disposition of the drainage port is as follows: A high-temperature gas duct characterized in that a pocket opening in an area large enough to introduce the amount of water discharged is additionally provided, and the drain port is provided at the bottom of the pocket. 2. A vertically oriented inner cylinder for passing a high temperature gas,
A vertically-oriented outer cylinder surrounding the inner cylinder with a cooling space therebetween, and a plurality of spray nozzles arranged in the cooling space for spraying cooling water on the outer surface of the inner cylinder, In the high temperature gas duct in which a cooling water drainage port is provided in the lower portion of the outer cylinder, the space is divided into a plurality of upper and lower parts by a partition wall provided between the inner cylinder and the outer cylinder, and the partition wall In order to drop the cooling water in the upper space into the lower space, a water passage hole should be provided at a location distant from the outer surface of the inner cylinder in order to drop the cooling water into a position far from the outer surface of the inner cylinder in the lower space. A high-temperature gas duct characterized by being provided.