JPS6342126Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to the structure of a concentrate burner in which a smelting reaction is carried out by blowing air or oxygen-enriched air as a reaction gas with concentrate in a flash smelting furnace. It is.

[Conventional technology]

In a flash-smelting furnace, dry concentrate, such as copper concentrate, is blown together with reaction air or oxygen-enriched air from a concentrate burner installed at the top of the reaction shaft, and the concentrate is instantly oxidized and melted to produce copper, etc. Concentrate the valuable metals as glue. In this case, it is important that the concentrate and the reaction air or oxygen-enriched air are uniformly mixed so that a uniform oxidation reaction proceeds within a very short period of time as they fall through the reaction shaft. If this mixing condition is poor and unreacted or undissolved substances are generated locally, this may accumulate in the settler at the bottom of the reaction shaft, hindering glue formation, causing large fluctuations in glue temperature and glue quality, and causing dust. This not only causes difficulties in operating the reactor due to the increased amount of scattering outside the reactor, but also causes local heating in areas where reactions occur in a concentrated manner, resulting in damage to the bricks of the reaction shaft.

In order to obtain such uniform mixing and reaction conditions, it is necessary to maintain the flow rate of the reaction gas blown into the concentrate falling from the concentrate chute at 80 m/sec or more. However, in conventional concentrate burners,
The opening area of the ventilate part, which is formed by the gap between the inner wall of the narrowest part of the burner body and the outer periphery of the concentrate chute, is constant, and it is used to supply oxygen into the concentrate chute and to supply oxygen-enriched air as a reaction gas. When using oxygen, there is a problem in that the amount of oxygen used decreases and the required flow rate of the reaction gas cannot be maintained, making it impossible to freely select the amount of oxygen to be used. Those who have already applied for practical application 1986-124820
(Utility Model No. 60-38665) was filed. In this invention, a repositionable flow rate adjusting cone is provided on the outer periphery near the lower end of the concentrate chute so as to adjust the flow rate of the reaction gas in the ventilate-like constriction section of the conventional concentrate burner. Although good combustion conditions can be obtained by using this flow rate adjustment cone, when processing a large amount of concentrate, it is necessary to increase the flow rate to improve mixing with the reaction gas, and the power cost of the blower increases. There were problems such as an increase in flow rate and wear of the flow rate adjustment cone.

[Problem that the invention attempts to solve]

The present invention solves the above-mentioned problems, strengthens the mixing and stirring force by giving the reaction gas a swirling flow at the part where it contacts the concentrate at the bottom of the concentrate burner, and does not disturb the generated swirling flow. The object of the present invention is to provide a concentrate burner that can reduce the flow rate by that amount.

[Means for solving problems]

In order to achieve this purpose, the present invention provides a flow rate regulating cone in contact with the outer periphery of the concentrate chute near the ventilated constriction, and a pipe surrounding the concentrate chute having an outer diameter equal to the outer diameter of the flow rate regulating cone continuous above the cone. The cone with this pipe can be moved up and down along the concentrate chute to adjust the position of the cone, and the reaction gas has a swirling flow at the part where it passes through a ventilated constriction at the bottom of the concentrate burner. Guide vanes are provided around the pipe that is movable up and down in the tapered part of the lower part of the concentrate burner body so as to cause this, and the presence of the cone disturbs the swirling flow and reduces the mixing effect. It was designed to prevent this.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a concentrate chute 2 is provided in the center of the burner body 1, and the lower end 3 of the concentrate chute 2 is located near a ventilate-like constriction part 4, and the flow rate regulating cone 5 is used for the reaction that passes through this part. In order to increase the flow rate of the gas for use, it is formed into a ring shape so as to be in contact with the outer periphery of the concentrate chute 2, and the lower side is formed into a conical shape, and its taper angle is approximately the same as the taper angle of the burner body 1. It's getting old. 6
is a pipe having a diameter equal to the outer diameter of the cone that is continuous with the upper part of the flow rate regulating cone, and is extended into the burner body 1 along the concentrate chute 2, and a plurality of hanging rods 7 are fixed to the upper end of the pipe, and a plurality of hanging rods 7 are fixed to the burner body. The height of the flow rate adjusting cone 5 can be adjusted up or down by penetrating the upper surface of the flow rate adjusting cone 5 and changing its fixed position using a stopper 8. Reference numeral 9 denotes a blower pipe for feeding the reaction gas, and 10 a guide vane for generating a swirling flow in the reaction gas. It is provided at an appropriate angle with respect to the axial direction of the concentrate chute 2. FIG. 2 is a top view and a longitudinal sectional view of the guide vane 10, in which 11 is an outer casing, 12 is an inner casing, the outer casing 11 has the same slope as the tapered part of the concentrate burner 1, and the inner casing The inner diameter of the pipe 6 is slightly larger than the outer diameter of the pipe 6, and the pipe 6 can be moved up and down as necessary. The guide vanes 10 are provided between the outer casing 11 and the inner casing 12 at equal intervals and inclined at a constant angle of 20 to 70 degrees with respect to the axial direction of the concentrate chute 2. This guide blade 10
If assembled within the concentrate burner body, no special fixing is required.

The opening area of the lower end of the guide vane 10 is desirably selected so that the flow velocity of the reaction gas at this position is at least 10% of the required passage velocity of the reaction gas passing through the ventilated constriction part. The pitch of the blade is at the position of inner casing 12.
The height and inclination angle of the guide vanes 10 are preferably 20 to 55 mm, and it is desirable that the lower ends of the guide vanes overlap by at least half a pitch when viewed from the top. However, if the pitch of the guide vanes is small, the height of the vanes is high, and the overlap is too large, the air blowing resistance becomes large, which is not preferable.

〔effect〕

When the concentrate burner of the present invention is used, compared to a concentrate burner that has a flow rate adjustment cone whose height can be adjusted only by a conventional hanging rod and does not create a swirling flow in the reaction gas, the Due to the installation of the blades, a sufficient swirling flow is generated in the ventilate-shaped constriction part of the concentrate burner, so when the flow velocity of the reaction gas in the concentrate burner ventilate-shaped constriction part is the same, the temperature inside the burner cone is rises,
It was confirmed that the mixing and stirring power of the reactant gas and the concentrate was increased, and the generation of swirling flow extended the residence time in the shaft, reducing the dust generation rate, and furthermore, the generation rate of dust was reduced. When a very high flow rate is required, there is no problem in reducing the flow rate by an amount commensurate with the increase in the mixing and stirring force due to the swirling flow, so the power cost of the blower can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the concentrate burner of the present invention, FIG. 2 a is a top view of a guide vane, and FIG. 2 b is a longitudinal sectional view thereof. 1... Burner body, 2... Concentrate chute, 5
...Flow rate adjustment cone, 6...Pipe, 7...Hanging rod, 9...Blow pipe, 10...Guide vane.

Claims (1)

[Scope of utility model registration request] It has a tubular concentrate chute that is located in the center of the burner body and extends to the ventilate-shaped constriction part of the burner body, and reacts the reaction gas from between the concentrate chute and the ventilate-shaped constriction part. In a concentrate burner for a flash smelting furnace that blows into the upper part of the shaft, a flow rate adjusting cone and
A pipe surrounding a continuous concentrate chute having the outer diameter of the cone is provided above the concentrate chute so as to be movable up and down along the concentrate chute, and a burner is installed so as to generate a swirling flow in the reaction gas passing through the ventilated constriction part. A concentrate burner for a flash smelting furnace, characterized in that guide vanes are provided around the pipe at the bottom of the main body.