JP4597443B2 - Deposit removing apparatus for roasting furnace and roasting furnace provided with the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a deposit removing apparatus for a roasting furnace for removing deposits attached to an inner wall of a roasting furnace and a roasting furnace provided with the apparatus.
[0002]
[Prior art]
Usually, a roasting furnace is used for recovering hydrochloric acid and producing iron oxide from a pickling waste liquid after being used for pickling of steel. The roasting furnace has a substantially cylindrical body, and includes a spraying port for spraying pickling waste liquid into the furnace and a combustion gas blowing port for blowing combustion gas into the furnace. The pickling waste liquid is thermally decomposed into hydrochloric acid gas and iron oxide by the combustion gas blown into the furnace so as to form a swirl flow.
[0003]
However, the generated iron oxide or the like adheres to the inner wall of such a roasting furnace, particularly in the vicinity of the combustion gas inlet, and tends to become a large block-shaped lump as time passes. For this reason, since the combustion gas that should be swirled along the inner wall of the roasting furnace is blown toward the center of the roasting furnace, a normal swirl flow is not formed, and hot air is scattered throughout the furnace. . As a result, the roasting reaction in the roasting furnace becomes abnormal, causing a problem that the quality of the iron oxide produced is deteriorated. Then, when using a roasting furnace, the operation | work which removes deposits, such as iron oxide adhering to the furnace inner wall of a roasting furnace, is performed regularly.
[0004]
As a method for removing this deposit, as disclosed in Japanese Patent Application Laid-Open No. 4-292788, a steel rope is hung from the top of the furnace of the roasting furnace, and a long stick is inserted into the furnace wall. Means have been proposed to squeeze off the adhered deposits (first conventional example).
Japanese Patent Application Laid-Open No. 7-41321 discloses a combustion gas injection port in the inner wall of a roasting furnace by providing a rotatable blade or brush near the combustion gas injection port and periodically operating the blade or brush. Means for reducing the generation of deposits in the vicinity are disclosed (second conventional example).
[0005]
[Problems to be solved by the invention]
However, in the first conventional example, since it is difficult to carry out the operation during the operation of the roasting furnace, it is necessary to temporarily stop the operation of the roasting furnace and start the operation again after completion of the deposit removal work. The efficiency was not good. Moreover, there was a possibility that the inner wall of the furnace was accidentally damaged by the stick. Furthermore, since the inside of the furnace is high temperature, it was a harsh work for the workers who operate the long sticks.
[0006]
Further, in the second conventional example, since the drive shaft is provided in the vicinity of the combustion gas inlet through which high-temperature hot air is blown out, the seal portion cannot be held for a long time, and long-term stable continuous operation is difficult. There was a problem that.
Therefore, the present invention has been made in view of the above circumstances, and it is possible to safely and surely remove deposits adhering to the inner wall of the roasting furnace and to ensure stable operation of the roasting furnace. It is an object of the present invention to provide a deposit removing apparatus for a roasting furnace and a roasting furnace equipped with the apparatus.
[0007]
[Means for Solving the Problems]
In order to solve such a problem, the invention described in claim 1 is attached to the inner wall of a roasting furnace provided with a combustion gas inlet for injecting combustion gas from the inner wall of the furnace into the furnace. In the deposit removing apparatus for a roasting furnace for removing deposits, the deposit scraping portion for removing the deposits has a shape along the inner wall of the furnace, and the combustion communicates from the combustion gas inlet to the furnace. The apparatus is provided with a deposit removing apparatus for a roasting furnace which has a gas blowing passage and can move up and down along the inner wall of the furnace.
[0008]
The invention described in claim 2 is the apparatus for removing deposits for a roasting furnace according to claim 1, wherein the deposit scraping part is two upper and lower flat plates having a shape along the inner wall of the furnace, A plurality of reinforcing plates are fixed with a gap therebetween so that the combustion gas blowing passage is formed between the flat plates.
According to a third aspect of the present invention, there is provided a roasting device comprising: a combustion gas inlet for injecting combustion gas from the furnace inner wall into the furnace; and deposit removing means for removing deposits adhering to the furnace inner wall. In the furnace, the deposit removing means includes a deposit scraping portion having a shape along the inner wall of the furnace, and includes a combustion gas blowing passage communicating from the combustion gas blowing port into the furnace. It is assumed that it can move up and down along the inner wall of the furnace.
[0009]
According to a fourth aspect of the present invention, in the roasting furnace according to the third aspect, the deposit removing means includes two upper and lower flat plates having a shape along the inner wall of the furnace as the deposit scraping portion. A plurality of reinforcing plates are fixed with a gap therebetween so that the combustion gas blowing passage is formed between the flat plates.
In the apparatus for removing deposits for a roasting furnace according to the present invention, the deposit removing part for removing deposits has a shape along the inner wall of the furnace, so that the deposit removing apparatus moves up and down along the inner wall of the furnace. Therefore, it is possible to easily remove deposits attached to the inner wall of the furnace.
[0010]
In addition, since the deposit removing device includes a combustion gas blowing passage communicating from the combustion gas blowing port into the furnace, the deposit removing device is prevented from being pushed into the roasting furnace by the blown combustion gas. Therefore, it is possible to reliably remove deposits even during the operation of the roasting furnace. Therefore, it is possible to stabilize the operation over a long period of time and reduce the operation cost.
[0011]
In particular, in the apparatus for removing deposits for a roasting furnace according to claim 2, a combustion gas blowing passage from the combustion gas blowing port into the furnace is formed between two upper and lower flat plates shaped along the inner wall of the furnace. As described above, by fixing a plurality of reinforcing plates with gaps, it is possible to easily and reliably form the combustion gas blowing passage and to easily secure the weight and strength necessary for removing the deposits. can do. Therefore, the deposits can be reliably removed, and the deposit removing device can be easily formed at a relatively low cost.
[0012]
In the roasting furnace according to the present invention, since the deposit removal device for a roasting furnace according to claim 1 or 2 is provided, the deposit can be removed safely and reliably. It is possible to prevent the swirling flow of the combustion gas from being disturbed by the kimono. Therefore, it is possible to stabilize the operation of the roasting furnace over a long period of time and reduce the operation cost, and to improve the quality of the iron oxide produced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a roasting furnace according to the present invention, in which (A) is a longitudinal sectional view and (B) is a transverse sectional view. FIG. 2 shows a deposit removing apparatus for a roasting furnace according to the present invention, wherein (A) is a plan view and (B) is a front view.
[0014]
As shown in FIG. 1, a roasting furnace 100 showing an embodiment of the present invention is for recovering hydrochloric acid gas 2 and producing iron oxide 3 from a pickling waste liquid 1 after being used for pickling steel. The body from the upper part to the middle part of the roasting furnace 100 is a cylinder, and a cone-like cylinder is integrally formed below the cylinder. In the roasting furnace 100, combustion is formed on the top 100 a of the furnace and sprayed on the pickling waste liquid 1 and on the side wall of the lower part 100 b of the roasting furnace 100 to generate hot air of the swirl flow 21. A gas blowing port 20, an iron oxide recovery port 30a for recovering the generated iron oxide 3 formed in the furnace bottom 100c, a hydrochloric acid gas recovery port 30b for recovering the hydrochloric acid gas 2 formed in the vicinity of the furnace top 100a, And a deposit removing device 40 that removes deposits made of generated iron oxide 3 and the like adhering to the furnace inner wall in the vicinity of the combustion gas inlet 20. In FIG. 1B, the deposit removing device 40 provided in the combustion gas blowing ports 20b and 20c is omitted.
[0015]
The combustion gas injection ports 20 are provided with three combustion gas injection ports 20 a, 20 b, and 20 c that are spaced at predetermined intervals so as to generate hot air swirling in the roasting furnace 100 along the inner wall of the roasting furnace 100. It is inclined and attached to the inner wall of the furnace 100 in a tangential direction. The angle X formed by the central axis 20A of the combustion gas inlet 20 and the tangent line 100A of the inner wall of the roasting furnace 100 varies depending on the size of the roasting furnace, which is large in a large roasting furnace and small in a small roasting furnace. However, in the roasting furnace 100 according to the present embodiment, the angle is set to 8 to 30 degrees. Here, the combustion gas G injected from the combustion gas injection port 20 generates a clockwise swirl flow 21 in a plan view in the roasting furnace 100.
[0016]
The deposit removing device 40 includes an upper and lower flat plates 41a and 41b having an arcuate shape along the inner wall of the roasting furnace 100, and a vertical direction with respect to the flat plate 41 between the two flat plates 41a and 41b. The plate-shaped reinforcing plates 42a, 42b, 42c, and 42d are fixed, and a cylindrical support bar 40A fixed to the upper surface of the flat plate 41a and connected to the wire rope 40B is provided. The winch 40C installed outside the furnace is supported so as to be movable up and down.
[0017]
The deposit removing device 40 is usually stored in a storage unit (not shown) installed outside the furnace near the side of the furnace top 100a. For example, the deposit removing apparatus made of iron oxide 3 or the like is removed. When performing, the wire rod 40B is pulled out by the winch 40C to move the support bar 40A downward, and the deposit removing device 40 is inserted into the roasting furnace 100. At this time, the deposit removing device 40 is installed with a predetermined interval (40 mm in this embodiment) between the inner wall of the roasting furnace 100.
[0018]
Here, the flat plates 41a and 41b are made of SUS (stainless steel) and function as a deposit cleaning part for scraping the deposit. That is, when the deposit removing device 40 is moved downward, the lower surface of the flat plate 41a or the lower surface of the flat plate 41b comes into contact with the deposit, while when the deposit removing device 40 is moved upward, the upper surface or the flat plate of the flat plate 41a. Since the upper surface of 41b comes into contact with the deposit, the deposit attached to the inner wall of the roasting furnace 100 can be removed.
[0019]
Further, the reinforcing plate 42 is made of SUS (stainless steel) like the flat plate 41 and prevents the combustion gas G from being blown into the roasting furnace 100 from the combustion gas blowing port 20 as shown in FIG. The two reinforcing plates 42a and 42b are fixed in a direction perpendicular to the flat plates 41a and 41b at a predetermined interval in parallel with the blowing direction of the combustion gas G. A space between the two reinforcing plates 42a and 42b serves as a combustion gas blowing passage. In addition, two reinforcing plates 42c and 42d are fixed between the flat plates 41a and 41b that are not in the combustion gas G blowing direction in the same direction as the width direction of the flat plate 41 (the vertical direction in FIG. 2A). Yes. By fixing the reinforcing plates 42a, 42b, 42c, and 42d between the flat plates 41a and 41b, it is possible to secure the weight and strength necessary for removing the deposits.
[0020]
In the roasting furnace 100 having the above-described configuration, the pickling waste liquid 1 sprayed from the spray port 10 of the furnace top 100a is roasted by the swirl flow 21 of hot air sprayed from the three combustion gas injection ports 20 on the side wall of the furnace lower part 100b. A firing reaction occurs, and hydrochloric acid gas 2 and iron oxide 3 are generated. The hydrochloric acid gas 2 is recovered from the hydrochloric acid gas recovery port 30b together with the combustion gas G, and the iron oxide 3 is recovered from the iron oxide recovery port 30a.
[0021]
Next, the operation of the deposit removal device 40 installed in the roasting furnace 100 having the above configuration will be described.
First, the deposit removing device 40 stored in the storage unit is inserted along the inner wall of the roasting furnace 100 by moving the support bar 40A downward by pulling out the wire rope 40B from the winch 40C.
[0022]
Next, in the vicinity of the inner wall near the combustion gas inlet 20, the winch 40C is adjusted to move the deposit removing device 40 up and down. Here, when the support bar 40A is moved downward, the deposit is in contact with the lower surface of the flat plate 41a or the lower surface of the flat plate 41b of the deposit removing device 40. On the other hand, when the support bar 40A is moved upward, the deposit is removed. Since the deposits come into contact with the upper surface of the flat plate 41a or the upper surface of the flat plate 41b of the apparatus 40, the deposits adhered to the inner wall of the roasting furnace 100 are scraped off. At this time, the deposit made of iron oxide 3 or the like scraped off falls down along the side wall of the furnace lower part 100b and is recovered from the iron oxide recovery port 30a provided in the furnace bottom part 100c.
[0023]
Subsequently, the deposit removing device 40 that has finished the deposit removing operation moves the support rod 40A of the deposit removing device 40 to the upper outside of the furnace again by the operation of the winch 40C and stores it in the storage unit.
Here, the removal work by the deposit removing device 40 can be carried out even during operation of the roasting furnace 100 or when the operation is stopped, but is preferably carried out during operation in consideration of production efficiency. . In addition, the removal work of the deposit removing device 40 may be performed periodically, or may be performed at any time when the deposit is found.
[0024]
In the roasting furnace 100 configured as described above, the deposit removing device 40 in which the plurality of reinforcing plates 42a to 42d are fixed between the two flat plates 41a and 41b is attached to the inner wall of the roasting furnace 100. Sufficient weight and strength that can withstand removal of deposits can be secured, and the structure can be easily manufactured. Further, the reinforcing plates 42a and 42b are formed along the combustion gas blowing passage so as not to hinder the blowing of the combustion gas G from the combustion gas blowing port 20 into the roasting furnace 100. Therefore, it is possible to suppress the deposit removing device 40 from being pushed into the roasting furnace 100. For this reason, the deposit removing device 40 can reliably remove deposits attached to the inner wall of the roasting furnace 100 and perform the deposit removing operation even while the roasting furnace 100 is in operation. Became possible.
[0025]
Furthermore, since the vertical movement of the deposit removal device 40 is automated by the winch 40C, it is possible to improve the work efficiency and safety of the deposit removal operation.
Further, the winch 40C for automatically moving the deposit removing device 40 up and down is installed outside the roasting furnace 100, and the flat plate 41 and the reinforcing plate 42 as the deposit cleaning unit are both formed of SUS. As a result, it is possible to suppress deterioration of the deposit removing device 40 due to the high-temperature combustion gas G, so that stable continuous operation over a long period of time can be performed.
[0026]
Here, in the deposit removing apparatus 40 according to the present embodiment, the deposit scraping portion is composed of two flat plates 41a and 41b, and four reinforcing plates 42a to 42d are fixed between the flat plates 41a and 41b. However, the number of reinforcing plates 42 or the position where the reinforcing plates 42 are formed is not limited to this, and at least the shape along the inner wall of the roasting furnace 100 and the strength necessary for removing deposits are provided. If it has a shape that does not prevent the combustion gas G from being blown out, it can be changed at any time.
[0027]
In addition, in the deposit removing apparatus 40 in the present embodiment, the support bar 40A connected to the winch 40C is used as the means that enables the vertical movement, but not limited to this, any moving means may be applied. I do not care.
Furthermore, although the deposit removal apparatus 40 in this Embodiment was applied to the roasting furnace 100 which thermally decomposes the iron chloride aqueous solution which is a pickling waste liquid after being used for the pickling of steel materials, it is not limited to this, Any solution may be applied to a roasting furnace for thermally decomposing.
[0028]
【The invention's effect】
As described above, according to the deposit removing apparatus for a roasting furnace in the present invention, it is possible to remove deposits attached to the inner wall of the furnace safely and reliably.
In addition, since the deposit removal operation can be performed safely and reliably even during the operation of the roasting furnace, the operation can be stabilized over a long period of time and the cost can be reduced. Become.
[0029]
According to the roasting furnace of the present invention, since the deposit removing device for the roasting furnace is provided, the deposits attached to the inner wall of the furnace can be removed safely and reliably. It is possible to produce high-quality iron oxide without disturbing the normal swirl flow.
Moreover, even during the operation of the roasting furnace, it is possible to remove the deposits, so that it is possible to stabilize the operation over a long period of time and reduce the cost.
[Brief description of the drawings]
FIG. 1 shows a roasting furnace according to the present invention, in which (A) is a longitudinal sectional view and (B) is a transverse sectional view.
2A and 2B show a roasting furnace deposit removing apparatus according to the present invention, in which FIG. 2A is a plan view and FIG. 2B is a front view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pickling waste liquid 2 Hydrochloric acid gas 3 Iron oxide 10 Spraying port 20, 20a, 20b, 20c Combustion gas injecting port 20A Center axis 21 Swirling flow 30a Iron oxide recovery port 30b Hydrochloric acid gas recovery port 40 )
41, 41a, 41b Flat plate (attachment scraping part)
42, 42a, 42b, 42c, 42d Reinforcing plate 40A Support rod 40B Wire rope 40C Winch 100 Roasting furnace 100a Furnace top part 100b Furnace lower part 100c Furnace bottom part 100A Tangent G Combustion gas X Angle

Claims (4)

In the roasting furnace deposit removal apparatus for removing deposits adhered to the furnace inner wall of the roasting furnace having a combustion gas blowing port for blowing combustion gas from the furnace inner wall into the furnace,
The deposit cleaning part for removing the deposit is shaped along the inner wall of the furnace, has a combustion gas injection passage communicating from the combustion gas injection port into the furnace, and is vertically moved along the inner wall of the furnace. An apparatus for removing deposits for a roasting furnace, which is movable. The adhering matter scraping portion is two upper and lower flat plates having a shape along the inner wall of the furnace, and a plurality of reinforcements are provided with a gap so that the combustion gas blowing passage is formed between the flat plates. The apparatus for removing deposits for a roasting furnace according to claim 1, wherein a plate is fixed. In a roasting furnace comprising a combustion gas blowing port for blowing combustion gas from the furnace inner wall into the furnace, and deposit removing means for removing deposits attached to the furnace inner wall,
The deposit removing means includes a deposit scraping portion having a shape along the inner wall of the furnace, and includes a combustion gas blowing passage communicating from the combustion gas blowing port into the furnace, and along the inner wall of the furnace. A roasting furnace characterized by being vertically movable. The deposit removing means includes two upper and lower flat plates having a shape along the inner wall of the furnace as the deposit scraping portion, and a gap is formed so that the combustion gas blowing passage is formed between the flat plates. The roasting furnace according to claim 3, wherein a plurality of reinforcing plates are fixed with a gap therebetween.

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