JPH11337271A - Water cooled jacket for uptake output side horizontal coupling part of flash smelting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a water cooled jacket for naturally dropping most of an adhered and grown accretion to an uptake side without using a machine facility or the like. SOLUTION: The flash melting furnace comprises horizontal jackets 20, 21 placed on a lower surface of a horizontal coupler 10, and a triangular jacket 30 placed on an end to a waste heat boiler 11 side in a direction perpendicular to a gas flow in such a manner that a top surface of the former is a smooth descent gradient continued toward an uptake and that of the latter has two abrupt oblique surfaces to the uptake side and the boiler side at a ridge as a boundary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water cooling jacket for an uptake outlet horizontal connecting portion which is a gas discharge portion of a flash smelting furnace for smelting metals such as copper and nickel. The present invention relates to the water-cooled jacket configured to prevent a large lump of the fixed smoke ash (beco) from falling to the waste heat boiler side.

[0002]

2. Description of the Related Art A flash smelting furnace is generally used as a primary smelting furnace for nonferrous metals such as copper and nickel. An example of the flash smelting furnace will be described with reference to FIG. 1 is a flash smelting furnace, 2 is a shaft into which ore or fuel is charged, 3 is a concentrate burner, 4 is a settler as a hearth, 5 is an uptake as an exhaust gas discharge path, 6 is a slag hole, 7 is a mat hole, S is slag, M is a mat, 8 is a refining furnace (can = slag) which is a secondary slag smelting furnace attached to the flash smelting furnace 1, 9 is an electrode,
In the smelting furnace 8, the mat M contained in the slag S extracted in the flash smelting furnace 1 is separated again. There is also a flash smelting furnace which is not provided with a smelting furnace by directly attaching electrodes to the flash smelting furnace 1 (this is particularly called a flash furnace). Reference numeral 10 denotes a horizontal connecting portion for connecting the uptake and the waste heat boiler 11 on the outlet side.

[0003] In the case of copper smelting, for example, concentrate (pulverized ore of high quality by beneficiation) is mixed with fuel, oxygen-enriched air, flux, hot air and the like, and the concentrate burner at the top of the shaft 2. 3, the concentrate is oxidized and melted instantaneously, and the melted portion accumulates in the settler 4, and the exhaust gas mainly composed of sulfurous acid gas is discharged from the uptake 5 to the horizontal connection portion.
After passing through 10, the heat is recovered by the waste heat boiler 11, and then sent to the sulfuric acid factory to become a raw material for sulfuric acid. The slag S is separated into an upper layer and a lower layer M by the difference in specific gravity in the setter 4, and the slag S is continuously extracted from the slag hole 6. ) Is performed in batches from the mat hole 7 every several hours.

The exhaust gas generated in the setter 4 contains nitrogen gas, sulfur dioxide gas and carbon dioxide gas as main components and contains a large amount of dust. When the dust comes into contact with a water-cooled jacket provided on the uptake 5 or the like, a solid substance called fixed smoke ash (hereinafter, referred to as “beco”) mainly composed of copper sulfide, iron sulfide, iron oxide, ferrite, or the like. Adhere to the surface,
The soot blower is frequently operated and blown off by pressurized air, as this grows with the operation and causes troubles such as blocking the flue and a lump of material suddenly peeling off and falling, but it is too strong If it adheres to the surface, operations such as blasting and crushing are required.

FIG. 4 is a partial plan view of the flash smelting furnace showing the vicinity of the uptake, and FIG. On the lower side surface of the horizontal connecting portion 10 connecting the rising portion of the uptake 5 and the waste heat boiler 11, there is no natural fall due to its own weight, so that piles of beko are extremely large. Therefore, it is necessary to remove this by shaving or cracking it before it grows too much, but removing it while the furnace is operating is a work with high heat and groping, so the load on workers is enormous, However, shutting down the furnace and doing this was not desirable because it reduced the operating rate.

If the bevel of the horizontal connecting portion 10 falls to the uptake 5 side, it is re-dissolved in the molten slag, so that there is no problem because the copper is absorbed by the mat layer.
Even if it falls to the 11 side, it can be discharged to the outside by a dust discharge chain conveyor 12 or the like provided at the bottom and reused. However, if a large lump exceeding the capacity of the chain conveyor 12 falls on the boiler side, it becomes extremely difficult to discharge the lump.

According to Japanese Patent Application Laid-Open No. H8-159663, it has been proposed to provide a horizontal scraping means capable of moving in a horizontal direction in a flue horizontal section to scrape the bellows. This will be described briefly with reference to FIG. 50 is this beko scraper, 51 is its mount, 52
Is a hydraulic in / out cylinder for moving the gantry 51 in and out in the direction of arrow A, 53 is a hydraulic scraping cylinder attached to the gantry 51, 54 is an arm connected to the scraping cylinder, and 55 is a claw attached to the tip of the arm 54 It is.

In a normal operation state, this beko scraping machine
50 is outside the flue, but when performing scraping, first open the flue door H, let the head of the scraper 50 enter the flue by the in / out cylinder 52, and operate the scraping cylinder 53. When the claw 55 at the distal end is reciprocated in the direction B via the arm 54, the claw 55 is located immediately above the horizontal portion D of the flue, so that the piled-up beco can be scraped off. Further, it is possible to change the scraping position by operating the access cylinder 52 in various ways. In addition, although not shown, a pressurized air pipe and the like for blowing off the scraped beco into the flue are also provided.

[0009] In this way, it is possible to mechanically scrape the beco and blow it off into the flue. However, equipment costs are high, and the lump that has entered the boiler must be extracted and subjected to another treatment. There is a problem that the operation is affected because the operation is performed by opening the flue door.

[0010]

SUMMARY OF THE INVENTION The present invention does not require any mechanical equipment such as the above-mentioned beco scraper or the like, and the deposition and growth of beko are suppressed without any particular operation, so that most of the grown beko It is an object of the present invention to provide a water-cooled jacket installed at a horizontal connection portion so that the water-cooled jacket falls on the uptake side and hardly falls on the boiler side.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a water cooling jacket for a horizontal connecting portion connecting an uptake of a flash smelting furnace and a waste heat boiler. The jacket comprises a triangular jacket having a substantially triangular cross section which is mounted in a direction perpendicular to the gas flow at an end of the jacket close to the waste heat boiler, and a top surface of the horizontal jacket has a gentle downward slope continuous toward an uptake, The triangular jacket has two steep slopes near an uptake and a waste heat boiler at a ridgeline formed by a vertex of a triangular hypotenuse of a cross section. A water-cooled jacket, preferably, the horizontal jacket is divided into a plurality of sections, and the down slope of the horizontal jacket ranges from 3 to 10 degrees in angle. The water cooling jacket for an uptake exit side horizontal connection portion of the flash smelting furnace, wherein an angle of a slope of the triangular jacket is in a range of 30 to 60 degrees with respect to a horizontal plane.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial plan view of a flash smelting furnace showing the vicinity of a horizontal connection portion provided with a water-cooled jacket of the present invention. FIG. 2 is a front view of the same portion. A jacket, 30 is a triangular jacket placed on the end of the horizontal jacket 21 near the waste heat boiler, and 40 is a side wall hardware.

The horizontal jackets 20 and 21 are made of steel, and are provided with appropriate baffles and the like as in a general water cooling jacket, and are connected to a cooling water pipe to perform water cooling. Since the uptake 5 is cylindrical, the overall planar shape is obtained by cutting a square in half vertically and cutting off an inscribed semicircle. FIG. 1
As shown in FIG. 7, in this embodiment, the portion (20a, 20b) closer to the uptake 5 and the portion (21) closer to the boiler are divided into three parts in consideration of maintenance such as replacement and cooling capacity. The overall top surface is a gentle downward slope that continues toward uptake 5. If the angle is too small, the effect of dropping the beco to the uptake side will be insufficient, and if the angle is too large, the effective cross section of the flue will decrease, or the uptake side and boiler side will be reduced in the cross section of the water channel in the jacket. In this case, the difference in the thickness of the water flow becomes large, causing a problem in the cooling capacity. Therefore, the range of 3 to 10 degrees is appropriate.
Incidentally, the gradient in the present embodiment is about 6 degrees.

One triangular jacket 30 is also made of steel,
The shape is a bar having a substantially triangular cross section. Horizontal jacket 21
Of the waste heat boiler 11 near the horizontal jacket 2
At the top of the gradient of 0, 21 is mounted with the triangle oblique side downward and perpendicular to the gas flow direction, and the inside is water-cooled like the horizontal jackets 20, 21. This triangular jacket 30 has a steeper slope than the two horizontal jackets near the uptake and the waste heat boiler, with the ridge formed by the apex of the hypotenuse of the triangle of the cross section as a boundary. As shown, only the beco that adhered to the slope near the waste heat boiler from the ridge line and fell into the waste heat boiler, and the portion on the uptake side from the ridge line that occupies most of the attached area grows on the boiler side. Since it falls into the uptake and is melted by the setter without dropping, it is possible to leave it alone, but it is very easy to drop it, so it is desirable to scrape sometimes. The slope of the triangular jacket 30 near the waste heat boiler hardly grows, and even if it grows occasionally, it falls by its own weight, so that maintenance is unnecessary.

The angle of the slope of the triangular jacket must be naturally larger than the angle of the horizontal jacket in anticipation of natural falling of the beco, etc. However, it is not preferable that the height is too high. A range of degrees is appropriate. Incidentally, the angle of this embodiment is 45 degrees with respect to the horizontal plane on both the uptake side and the waste heat boiler side. Even if the triangular jacket 31 is removed for some reason, there is no hindrance to the operation.

[0016]

According to the present invention, it is possible to greatly reduce the trouble of falling down in a waste heat boiler, reduce the maintenance load, and improve the operating rate of the flash smelting furnace.
It has excellent effects.

[Brief description of the drawings]

FIG. 1 is a partial plan view showing the vicinity of a horizontal connecting portion according to an embodiment of the present invention.

FIG. 2 is a partial front view showing the vicinity of a horizontal connecting portion according to the embodiment of the present invention.

FIG. 3 is a conceptual diagram of a flash smelting furnace according to the present invention.

FIG. 4 is a plan view showing the vicinity of an uptake exit side of the flash smelting furnace according to the present invention.

FIG. 5 is a partial sectional view taken along the line XX of FIG. 4;

FIG. 6 is a front view of a beco scraping machine showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flash furnace 2 Shaft 3 Concentrate burner 4 Settler 5 Uptake 6 Slag hole 7 Mat hole 8 Smelting furnace 9 Electrode 10 Horizontal connection part 11 Waste heat boiler 12 Chain conveyor 20, 21 Horizontal jacket 30 Triangular jacket 40 Side wall hardware 50 Veco scraper 51 Frame 52 In / out cylinder 53 Scraping cylinder 54 Arm 55 Claw

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yuji Tanioka 6-1-1 Hibi, Tamano-shi, Okayama Mitsui Kinzoku Mining Co., Ltd.

Claims (4)

[Claims] 1. A water-cooled jacket for a horizontal connecting portion (10) connecting an uptake (5) of a flash furnace and a waste heat boiler (11), the horizontal jacket being placed on the lower surface of the horizontal connecting portion (10). (20, 21) and a triangular jacket (30) having a substantially triangular cross section which is mounted on the end of the horizontal jacket (20, 21) near the waste heat boiler (11) in a direction perpendicular to the gas flow. The top surfaces of the jackets (20, 21) have a gradual downward slope that continues toward the uptake (5), and the triangular jacket (30) has an uptake bordered by a ridge formed by the apex of the oblique side of the cross section. (5) A water-cooled jacket for the uptake outlet side horizontal connection part of the flash furnace, which has two steep slopes, one near the waste heat boiler and the other near the waste heat boiler (11). 2. The water-cooled jacket for the uptake outlet side horizontal connection part of the flash smelting furnace according to claim 1, wherein said horizontal jacket (20, 21) is divided into a plurality of parts. 3. The downslope of said horizontal jacket (20, 21) is in the range of 3 to 10 degrees in angle.
A water-cooled jacket for the horizontal connection of the up-take exit side of the flash smelting furnace according to Item 1. 4. The uptake outlet side horizontal connecting part of a flash smelting furnace according to claim 1, wherein the angle of the slope of the triangular jacket (30) is in a range of 30 to 60 degrees with respect to a horizontal plane. Water cooling jacket.