Cooling wall of smelting reduction furnace

Abstract

The utility model relates to the technical field of smelting reduction ironmaking, in particular to a cooling wall of a smelting reduction furnace. An opening of a slag hanging groove of the cooling wall of the smelting reduction furnace is inclined upwards, the included angle between the opening and the horizontal line is 30-60 degrees, and the inclined upward opening is filled with splashing slag; the cooling wall of the smelting reduction furnace is provided with an S-shaped cooling water channel which is provided with a water inlet and a water outlet; the cooling wall of the smelting reduction furnace is made of a copper-steel composite material, the hot surface and the slag hanging groove are made of copper, and the cold surface is made of steel. The cooling wall is high in cooling strength and good in slag hanging effect, and heat taken away by cooling water is reduced.

Description

Technical Field

[0001] A cooling wall technology for a smelting reduction furnace The present invention relates to the technical field of smelting reduction ironmaking, and in particular to a cooling wall for a smelting reduction furnace. Background Art

[0002] The molten reduction furnace directly uses iron ore powder and coal powder to make iron, eliminating the coking and sintering processes. The molten reduction ironmaking directly sprays ore powder and coal powder into the slag iron molten pool, where a reduction reaction occurs to generate CO. The CO rising from the molten pool and the ore and coal powder carrier gas bring the molten slag iron droplets into the upper space, forming "fountain"-like slag iron droplets; the rising CO gas and the hot air sprayed from the top hot air gun undergo a secondary combustion reaction, generating a large amount of heat, and the "fountain"-like slag iron droplets are heated and brought back to the molten pool. The slag droplets entering the upper part splash onto the furnace wall to form a slag shell to protect the furnace wall. Because the membrane water-cooled wall installed on the furnace wall of the molten reduction furnace has gaps between its cooling water pipes and poor slag hanging effect, the cooling water takes away a lot of heat, which also causes the furnace shell temperature on the outside of the water-cooled wall of the model wall to be high, and it will turn red in severe cases.

[0003] Similar blast furnace cooling walls have dovetail grooves for brick inlay, and their opening direction is perpendicular to the cooling wall body, which also cannot solve the slag hanging problem of the cooling wall of the molten reduction furnace. Summary of the invention

[0004] Technical issues solved

[0005] The slagging effect is poor, resulting in a large amount of heat being taken away by the cooling water.

[0006] Solutions to technical problems

[0007] During production, hot air is sprayed into the smelting reduction furnace through a hot air spray gun, and mineral powder and coal powder are sprayed into the slag and molten iron pool through mineral and coal spray guns. The iron oxide in the mineral powder and the carbon in the coal powder react in the molten pool to generate CO, and the rising CO gas flow brings part of the slag and part of the molten iron into the upper space to form a slag fountain. CO burns in the secondary combustion zone and releases a large amount of heat. The temperature in the secondary combustion zone reaches above 1600℃, and the heated slag and molten iron fall back into the molten pool to heat the molten pool. The molten iron generated by the reaction is discharged through the fore furnace.

[0008] Provided is a cooling wall for a smelting reduction furnace, wherein a slag hanging groove of the cooling wall for the smelting reduction furnace opens obliquely upward, and the angle between the slag hanging groove and the horizontal line is 30° to 60°, and the oblique upward opening is filled with splashing slag to form a stable slag shell. The cooling wall for the smelting reduction furnace is installed on the inner side of the furnace shell of the smelting reduction furnace.

[0009] The cooling wall of the smelting reduction furnace is provided with a cooling water channel, which is S-shaped and is provided with a water inlet and a water outlet. There may be one water inlet and one water outlet, or there may be more than two water inlets and more than two water outlets.

[0010] The cooling wall of the molten reduction furnace is made of copper-steel composite, the hot surface and slag trough are made of copper, and the cold surface is made of steel.

[0011] The cooling wall of the molten reduction furnace of the present invention has high cooling strength, stable slag hanging, good heat insulation effect, reduces the heat taken away by cooling water, effectively avoids the furnace shell from becoming red, and reduces heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the cooling wall of the smelting reduction furnace

[0013] Figure 2 It is a smelting reduction furnace

[0014] Figure 3 Schematic diagram of the cooling wall water channel of the smelting reduction furnace

[0015] Figure 4 Schematic diagram of slag hanging on the cooling wall of molten reduction furnace

[0016] Legend Marker

[0017] 1 Melting reduction furnace, 2 Hot air spray gun, 3 Ore and coal spray gun, 4 Melting reduction furnace cooling wall, 5 Secondary combustion zone, 6 Slag fountain, 7 Slag, 8 Molten iron, 9 Melting reduction furnace cooling wall, 10 Water inlet pipe, 11 Water outlet pipe, 12 Slag trough, 13 Slag trough wall, 14 Cooling water channel, 15 Slag shell, 16 Fore furnace, 17 Furnace shell Specific embodiments

[0018] The following is a detailed description of the implementation of the present invention with reference to the accompanying drawings so that a person skilled in the art in the art can easily implement the present invention. The present invention can be embodied in many different forms and is not limited to this description.

[0019] In production, hot air is sprayed from the hot air lance 2 into the molten reduction furnace 1, and the ore powder and coal powder are sprayed into the slag 7 and molten iron 8 through the ore and coal lance 3. The iron oxide in the ore powder and the carbon in the coal powder react in the molten pool to generate CO. The rising CO gas flow brings part of the slag 7 and part of the molten iron 8 into the upper space to form a slag fountain 6. CO burns in the secondary combustion zone 5 to release a large amount of heat. The temperature of the secondary combustion zone 5 reaches above 1600°C. The heated slag 7 and molten iron 8 fall back into the molten pool to heat the molten pool. The molten iron 8 generated by the reaction is discharged through the forehearth 16. The slag droplets of the slag fountain 6 splash into the slag trough 12 of the cooling wall 4 of the molten reduction furnace. The slag trough of the cooling wall 4 of the molten reduction furnace opens obliquely upward, with an angle of 45° with the horizontal line. The oblique slag trough 12 is filled with slag, which solidifies into a slag shell 15 after cooling.

[0020] The smelting reduction furnace cooling wall 4 includes a smelting reduction furnace cooling wall body 9 , a cooling water channel 14 , a water inlet pipe 10 , a water outlet pipe 11 , a slag trough 12 , and a slag trough wall 13 .

[0021] The material of the cooling stave 4 of the molten reduction furnace is a copper-steel composite material. The hot surface and the slag trough are made of copper, and the cold surface is made of steel. When manufacturing the cooling stave 4 of the molten reduction furnace, the copper plate and the steel plate are first composited together, and then an S-shaped cooling water channel 14 is opened on the cold surface. The cooling water channel penetrates 10mm into the copper, and the cooling water channel is 80mm wide and 30mm high. After the cooling water channel 14 is opened, the cooling water channel is closed by welding with a steel plate, and then the inlet and outlet water pipes are installed. The specifications of each piece of the cooling stave 4 of the molten reduction furnace are mainly: length × width: 1500×1000; 1000×800; 800×600, etc.

[0022] Figure 2 The smelting reduction furnace has a cooling stave 4 installed inside the furnace shell 17. 10 to 28 cooling staves 4 are installed in the circumferential direction of the smelting reduction furnace 1, and 6 to 15 rows of cooling staves 4 are installed vertically.

Claims

1. A cooling wall of a smelting reduction furnace, the smelting reduction furnace comprising: The smelting reduction furnace shell, hot air spray gun, ore and coal spray gun, smelting reduction furnace cooling wall and fore furnace are characterized in that the smelting reduction furnace cooling wall is installed on the inner side of the smelting reduction furnace shell; 10 to 28 pieces of the smelting reduction furnace cooling wall are installed in the circumferential direction of the smelting reduction furnace and 6 to 15 rows are installed vertically; the slag trough opening of the smelting reduction furnace cooling wall is inclined upward.

2. A smelting reduction furnace cooling wall according to claim 1, characterized in that the cooling water channel of the smelting reduction furnace cooling wall is S-shaped and is provided with a water inlet and a water outlet.

3. A cooling wall of a smelting reduction furnace according to claim 1, characterized in that the material of the cooling wall of the smelting reduction furnace is a copper-steel composite, the hot surface and the slag trough are made of copper, and the cold surface is made of steel.

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