Method for prolonging service life of reverberatory furnace

Abstract

The invention relates to the technical field of non-ferrous metal smelting, and aims to provide a method for prolonging the service life of a reverberatory furnace, the reverberatory furnace comprises a furnace body, a flame nozzle is arranged on the side edge of the furnace body, and the method specifically comprises the following steps: 1) adjusting the diameter of the flame nozzle from 250 mm to 280 mm; (2) the horizontal included angle between the flame nozzle and the furnace body is adjusted from 9 degrees to 12 degrees; and the mounting height of the flame nozzle on the furnace body is adjusted from 2165mm to 1850mm. The flame nozzle is optimized and modified, so that scouring of reducing high-temperature flue gas to the furnace top is reduced, the service life of the reverberatory furnace top is prolonged, the flue gas is more effectively in contact with materials in the furnace, formation of furnace hearth caking is avoided, the effective volume of a molten pool is enlarged, meanwhile, the flue gas is directly in contact with the materials, and it is guaranteed that the reducing atmosphere in the furnace is fully used; and the high-temperature precipitation time is prolonged while the material melting time is shortened, and the lead content of matte is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of nonferrous metal smelting, and in particular relates to a method for prolonging the service life of a reverberatory furnace. Background Art

[0002] Lead slag reverberatory furnace is the core equipment of slag smelting, which consists of furnace base, furnace hearth, molten pool, combustion device, flue, waste heat boiler and dust collection facilities. The lead is separated into metallic lead, copper enters copper matte, zinc enters flue gas recovery, and other impurity components are removed by reacting flux (Na2CO3) and reducing agent coke powder with various components of slag at high temperature. The high-temperature flue gas of the lead slag reverberatory furnace enters the molten pool through the flame nozzle to increase the furnace temperature. The horizontal angle between the flame nozzle and the furnace body is 9°. Based on the bottom of the furnace cylinder, the flame nozzle is 2165mm high and 250mm in diameter. The flame nozzle has a high height, a small angle and a small diameter. The top of the reverberatory furnace, especially near the charging port, is easily eroded by the dual effects of charging collision and high-temperature flue gas scouring, which affects the life of the reverberatory furnace top. The original high-temperature flue gas not only affects the life of the reverberatory furnace due to its flow direction, but most of the high-temperature flue gas cannot directly contact the material pile in the furnace, resulting in a long smelting time and insufficient separation of copper and lead. During operation, the material fluidity is limited, resulting in certain restrictions on the quality of copper-lead alloy products. Summary of the invention

[0003] The object of the present invention is to provide a method for prolonging the service life of a reverberatory furnace, so as to solve the problems raised in the above background technology.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for improving the life of a reverberatory furnace, comprising a furnace body, wherein a flame nozzle is arranged on the side of the furnace body, and the method is characterized in that the method specifically comprises the following contents:

[0006] 1) Adjust the outer diameter of the flame nozzle from 250mm to 280mm;

[0007] 2) Adjust the horizontal angle between the flame nozzle and the furnace body from 9° to 12°;

[0008] 3) Adjust the installation height of the flame nozzle on the furnace body from 2165mm to 1850mm.

[0009] The flame spray nozzle comprises a straight pipe and a bell mouth which are connected to each other. The outer end of the bell mouth is provided with a connecting flange. The outer diameter of the straight pipe is 280 mm.

[0010] The inner diameter of the bell mouth opening is 375 mm.

[0011] The wall thickness of the flame spray nozzle is 20 mm.

[0012] The length of the flame spray nozzle is 820 mm, and the length of the straight tube is 580 mm.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0014] The present invention optimizes and transforms the flame spray nozzle so that the reducing high-temperature flue gas reduces the scouring of the furnace top, increases the life of the reverberatory furnace top, and more effectively contacts the materials in the furnace, thereby preventing the formation of furnace knots and expanding the effective volume of the molten pool. At the same time, the flue gas directly contacts the materials to ensure full use of the reducing atmosphere in the furnace, shortens the material smelting time, increases the high-temperature precipitation time, and reduces the lead content of the matte. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the angle and height of the reverberatory furnace flame nozzle before the transformation of the present invention.

[0016] Figure 2 This is a schematic diagram of the angle and height of the flame nozzle of the reverberatory furnace after the modification of the present invention.

[0017] Figure 3 This is a schematic diagram of the size of the reverberatory furnace flame nozzle before the transformation of the present invention.

[0018] Figure 4 This is a schematic diagram of the size of the reverberatory furnace flame nozzle after the modification of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In order to better understand the present invention, the following description is made:

[0022] During the daily smelting process of charge, when the reducing high-temperature flue gas enters the furnace body through the flame nozzle before the transformation, due to the high installation height, small angle and small diameter of the flame nozzle, the high-temperature flue gas height is high and relatively concentrated. The furnace roof masonry is flushed by the high-temperature flue gas for a long time, and the bricks become thinner and loose, resulting in the falling of the reverberatory furnace roof bricks, and the furnace needs to be stopped for maintenance; for the pile of materials in the reverberatory furnace, the pile heats up slowly, the charge melting time increases, and the copper and lead separation is not complete. Therefore, the height, angle and size of the flame nozzle are optimized and transformed.

[0023] like Figure 1-4 As shown, the present invention provides a method for improving the service life of a reverberatory furnace, comprising a furnace body, wherein a flame nozzle is arranged on the side of the furnace body, and specifically comprises the following contents:

[0024] 1) Adjust the outer diameter of the flame nozzle from 250mm to 280mm;

[0025] 2) Adjust the horizontal angle between the flame nozzle and the furnace body from 9° to 12°;

[0026] 3) Adjust the installation height of the flame nozzle on the furnace body from 2165mm to 1850mm.

[0027] The flame spray nozzle comprises a straight tube and a bell mouth connected to each other, the outer end of the bell mouth is provided with a connecting flange, the outer diameter of the straight tube is 280 mm, the inner diameter of the bell mouth opening is 375 mm, the wall thickness of the flame spray nozzle is 20 mm, the length of the flame spray nozzle is 820 mm, and the length of the straight tube is 580 mm.

[0028] Depend on Figure 1 It can be seen that the high-temperature flames from the nozzles of the lead slag reverberatory furnace travel upward, which not only scours the furnace top to a certain extent, but also more than 80% of the piles in the furnace are not directly in contact with the high-temperature flue gas. Figure 2 The range of high-temperature flue gas scouring the furnace top is significantly reduced, and 60% of the pile in the furnace is in direct contact with the high-temperature flue gas. Figure 4 Compare Figure 3 Increase Φ30mm to increase the radiation range of high-temperature flue gas.

[0029] The flame nozzle is optimized and transformed through the above three methods, and the specific effects are:

[0030] 1) Furnace temperature: increased from 1200℃ before transformation to 1280℃;

[0031] 2) Charge melting time: reduced from 3.5h / furnace before transformation to 3h / furnace;

[0032] 3) The life of the reverberatory furnace is increased from 21 months to 24 months;

[0033] 4) The reverberatory furnace roof inspection was reduced from 2 times / cycle to 1 time / cycle;

[0034] 5) Lead content in matte: reduced from 23% before transformation to 21%.

Claims

1. A method for increasing the life of a reverberatory furnace, comprising a furnace body, wherein a flame nozzle is arranged on the side of the furnace body, characterized in that: The specific contents include the following: 1) Adjust the outer diameter of the flame nozzle from Φ250mm to Φ280mm; 2) Adjust the horizontal angle between the flame nozzle and the furnace body from 9° to 12°; 3) Adjust the installation height of the flame nozzle on the furnace body from 2165mm to 1850mm.

2. A method for increasing the life of a reverberatory furnace according to claim 1, characterized in that: The flame spray nozzle comprises a straight pipe and a bell mouth which are connected to each other. The outer end of the bell mouth is provided with a connecting flange. The outer diameter of the straight pipe is 280 mm.

3. A method for increasing the life of a reverberatory furnace according to claim 1, characterized in that: The inner diameter of the bell mouth opening is 375 mm.

4. A method for increasing the life of a reverberatory furnace according to claim 1, characterized in that: The wall thickness of the flame spray nozzle is 20 mm.

5. The method for increasing the service life of a reverberatory furnace according to claim 1, characterized in that: The length of the flame spray nozzle is 820 mm, and the length of the straight tube is 580 mm.

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