Air cap structure in sintering flue gas multi-pollutant collaborative purification device

Abstract

The utility model discloses an air cap structure in a sintering flue gas multi-pollutant collaborative purification device. The air cap structure solves the problem of how to prevent an air cap head from being blown off or inclined by hot flue gas. Arc-shaped lower clamping tongues (5) are arranged on the outer side wall of the horizontal annular step (4) at equal intervals of 120 radians; a hat-shaped jacket (6) is buckled at the top end of the tubular air cap seat (2), jacket air outlets (7) are formed in the side wall of the jacket below a cap top plugging plate (8) of the hat-shaped jacket (6) at equal intervals of radians, the air cap head (3) is sleeved on the hat-shaped jacket (6), and air cap arc-shaped clamping tongues (10) are arranged on the inner side wall of a lower port of the air cap head (3) at equal intervals of 120 radians. An air cap arc-shaped channel (11) is arranged between every two adjacent air cap arc-shaped clamping tongues (10), the air cap arc-shaped channels (11) and the arc-shaped lower clamping tongues (5) are correspondingly arranged, and the arc-shaped lower clamping tongues (5) are movably connected in the air cap arc-shaped channels (11) in a sleeved mode.

Description

Technical Field

[0001] The utility model relates to a sintering fume multi-pollutant collaborative purification device for purifying sintering fume, in particular to an anti-tilting and anti-corrosion hood structure in the sintering fume multi-pollutant collaborative purification device. Background Art

[0002] Existing circulating fluidized bed boilers are generally divided into two types: steam boilers and hot water boilers. The fuel of circulating fluidized bed boilers is coal or other fuels with calorific value. The combustion air in the boiler is generally air, and the oxygen content in the air is about 21%. The flue gas generated in the furnace is discharged through the furnace, separator and tail flue in turn. The medium of the boiler is heat-exchanged with the high-temperature flue gas in the boiler through the economizer, water cooling system and superheater to form high-quality steam or hot water; in the iron smelting plant, the iron ore is first crushed into iron ore powder, mixed evenly with coke, limestone powder, etc., and then fired in a sintering machine for hot agglomeration and then used for subsequent iron smelting. In this process, the sintering machine will generate a large amount of sintering flue gas, which contains CO, SO2, NO x Toxic and harmful gases such as HCl and dioxins. The traditional process for treating these harmful gases is to add environmental protection equipment, which has the disadvantages of large equipment investment, high use and maintenance costs, and limited elimination of harmful gases. In view of the above situation, the prior art has adopted a technology for treating sintering flue gas with a circulating fluidized bed boiler. This special circulating fluidized bed boiler is also called a sintering flue gas multi-pollutant coordinated purification device. The main principle of the sintering flue gas multi-pollutant coordinated purification device is to replace the air with the sintering flue gas generated in the sintering machine as the combustion-supporting air of the circulating fluidized bed boiler, and through the high temperature environment in the furnace of the circulating fluidized bed boiler and the unique environmental protection advantages of the circulating fluidized bed boiler, the harmful gases in the sintering flue gas are burned and removed, and the steam or hot water generated by the circulating fluidized bed boiler is supplied to other processes in the iron and steel plant, achieving the effect of killing two birds with one stone.

[0003] A hood seat is provided on the furnace air distribution plate in the sintering flue gas multi-pollutant coordinated purification device, and a hood head is movably sleeved on the hood seat, and the hood head is pressed onto the hood seat by its own weight, and the hood seat distributes air to the fuel in the furnace to assist combustion under the blowing of combustion-supporting air; the hood in the existing circulating fluidized bed boiler as a sintering flue gas multi-pollutant coordinated purification device has the following two problems: first, due to the high pressure in the water-cooled air chamber of the boiler, when the sintering flue gas from the sintering machine blows the hood head upward from the water-cooled air chamber through the hood seat, the hood head is prone to tipping over; second, due to the alkali metals and corrosive gases of sodium, potassium and chlorine contained in the sintering flue gas used as a combustion aid, the top of the hood head is prone to corrosion and penetration under the blowing of the corrosive flue gas; how to ensure that the hood head is not blown off by the hot flue gas and to avoid the sintering flue gas containing alkali metals and corrosive gases directly washing the top of the hood head, so as to extend the service life of the hood head, has become a problem that needs to be solved on site. Summary of the invention

[0004] The utility model provides a hood structure in a sintering flue gas multi-pollutant collaborative purification device, which solves the technical problems of how to prevent the hood head from being blown off or tilted by hot flue gas and how to prolong the service life.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A hood structure in a sintering flue gas multi-pollutant coordinated purification device comprises an in-furnace air distribution plate, a tubular hood seat is arranged on the in-furnace air distribution plate, a horizontal annular step is arranged at the upper end of the outer wall of the tubular hood seat, and arc-shaped lower tongues are arranged at equal intervals of 120 arcs on the outer wall of the horizontal annular step; a top hat-shaped jacket is buckled on the top of the tubular hood seat, and jacket air outlets are arranged at equal intervals of arcs on the side wall of the jacket below the top sealing plate of the top hat-shaped jacket, and the jacket air outlets are connected to the tube cavity of the tubular hood seat; the hood head is sleeved on the top hat-shaped jacket, and hood arc-shaped tongues are arranged at equal intervals of 120 arcs on the inner wall of the lower port of the hood head, and a hood arc channel is arranged between two adjacent hood arc tongues, the hood arc channel and the arc-shaped lower tongue are arranged correspondingly, and the arc-shaped lower tongue is movably sleeved in the hood arc channel.

[0007] An arc-shaped upper tongue is arranged on the annular brim at the bottom end of the top hat-shaped jacket, and an arc-shaped upper tongue embedding groove is arranged on the side wall inside the lower port of the hood head above the arc-shaped upper tongue of the hood, the arc-shaped upper tongue and the arc-shaped upper tongue embedding groove are arranged correspondingly, and the arc-shaped upper tongue is movably sleeved in the arc-shaped upper tongue embedding groove; hood air outlets are arranged at equal intervals of arc on the hood head above the arc-shaped upper tongue embedding groove.

[0008] The tubular hood seat and the top-hat-shaped jacket are spot-welded together after being sleeved.

[0009] The hood head, jacket and hood seat of the utility model are all made of cast iron. The hood head and the jacket are first welded together. After the hood head is rotated, the hood head and the hood seat are locked and fixed by the cooperation of the tongue and the slot to prevent them from tipping over. The top of the jacket of the utility model is provided with a thickened upper cover plate, which plays a role in preventing sintering smoke from directly scouring the top of the hood head, thereby extending the service life of the hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model;

[0011] Figure 2 It is a structural schematic diagram of the hood seat 2 of the utility model;

[0012] Figure 3 is a schematic structural diagram of the hood seat 2 in a top view;

[0013] Figure 4 It is a structural schematic diagram of the top hat-shaped jacket 6 of the utility model;

[0014] Figure 5 yes Figure 4 Sectional view in the middle AA direction;

[0015] Figure 6 It is a structural schematic diagram of the hood head 3 of the utility model;

[0016] Figure 7 It is a schematic structural diagram of the hood head 3 in the upward direction. DETAILED DESCRIPTION

[0017] The utility model is described in detail below with reference to the accompanying drawings:

[0018] A hood structure in a sintering flue gas multi-pollutant coordinated purification device, comprising an in-furnace air distribution plate 1, a tubular hood seat 2 is fixedly arranged on the in-furnace air distribution plate 1, a horizontal annular step 4 is arranged at the upper end of the outer wall of the tubular hood seat 2, and the horizontal annular step 4 is used to support and connect the hood head 3; on the outer wall of the horizontal annular step 4, arc-shaped lower latches 5 are arranged at equal intervals of 120 arcs; a top hat-shaped jacket 6 is buckled at the top of the tubular hood seat 2, and a top hat-shaped jacket 6 is provided below the top cap sealing plate 8 of the top hat-shaped jacket 6. On the side wall of the jacket, jacket air outlets 7 are arranged at equal intervals of arc, and the jacket air outlets 7 are connected to the tube cavity of the tubular hood seat 2; the hood head 3 is sleeved on the top hat-shaped jacket 6, and on the inner wall of the lower port of the hood head 3, hood arc tongues 10 are arranged at equal intervals of 120 arcs, and a hood arc channel 11 is arranged between two adjacent hood arc tongues 10, and the hood arc channel 11 is arranged corresponding to the arc lower tongue 5, and the arc lower tongue 5 is movably sleeved in the hood arc channel 11.

[0019] An arc-shaped upper tongue 9 is arranged on the annular brim at the bottom end of the top hat-shaped jacket 6, and an arc-shaped upper tongue embedding groove 13 is arranged on the side wall inside the lower port of the hood head 3 above the arc-shaped upper tongue 10 of the hood. The arc-shaped upper tongue 9 and the arc-shaped upper tongue embedding groove 13 are arranged correspondingly, and the arc-shaped upper tongue 9 is movably sleeved in the arc-shaped upper tongue embedding groove 13; hood air outlets 12 are arranged at equal intervals of arc on the hood head 3 above the arc-shaped upper tongue embedding groove 13.

[0020] The tubular hood seat 2 and the top hat-shaped jacket 6 are spot welded together after being sleeved; during installation, the top hat-shaped jacket 6 is first sleeved into the hood head 3, and by rotating the top hat-shaped jacket 6, the arc-shaped upper tongues 9 arranged every 120 degrees on the lower end brim of the top hat-shaped jacket 6 are embedded into the arc-shaped upper tongue embedding groove 13 of the hood head 3; then the assembled hood head 3 and the top hat-shaped jacket 6 are sleeved together on the upper end of the tubular hood seat 2, so that the hood arc channel 1 on the inner side wall of the lower port of the hood head 3 1 is correspondingly sleeved together with the arc-shaped lower tongue 5. Finally, the hood head 3 is rotated to make the arc-shaped lower tongue 5 enter the arc-shaped lower tongue embedding groove 14. The arc-shaped lower tongue embedding groove 14 is arranged above the hood arc-shaped tongue 10 and is used to cooperate with the arc-shaped lower tongue 5, so that the arc-shaped lower tongue 5 on the horizontal annular step 4 locks the hood head 3 to prevent it from tipping over. Then the hood head 3 is welded to the circumference of the top hat-shaped jacket 6 as a whole, and the small ring at the bottom of the hood seat is positioned and welded to the fins on the air distribution plate as a whole.

Claims

1. A hood structure in a sintering flue gas multi-pollutant coordinated purification device, comprising an in-furnace air distribution plate (1), a tubular hood seat (2) being arranged on the in-furnace air distribution plate (1), and a horizontal annular step (4) being arranged at the upper end of the outer side wall of the tubular hood seat (2), characterized in that: On the outer wall of the horizontal annular step (4), arc-shaped lower tongues (5) are arranged at equal intervals of 120 degrees of arc; a top hat-shaped jacket (6) is buckled on the top of the tubular hood seat (2); on the jacket side wall below the top cap blocking plate (8) of the top hat-shaped jacket (6), jacket air outlets (7) are arranged at equal intervals of arc, and the jacket air outlets (7) are connected to the tubular cavity of the tubular hood seat (2); the hood head (3) is sleeved on the top hat-shaped jacket (6); on the inner wall of the lower port of the hood head (3), hood arc-shaped tongues (10) are arranged at equal intervals of 120 degrees of arc, and a hood arc-shaped channel (11) is arranged between two adjacent hood arc-shaped tongues (10); the hood arc-shaped channel (11) and the arc-shaped lower tongue (5) are arranged correspondingly, and the arc-shaped lower tongue (5) is movably sleeved in the hood arc-shaped channel (11).

2. The hood structure in the sintering flue gas multi-pollutant coordinated purification device according to claim 1 is characterized in that: An arc-shaped upper tongue (9) is arranged on the annular brim at the bottom end of the top hat-shaped jacket (6); an arc-shaped upper tongue embedding groove (13) is arranged on the side wall inside the lower end of the hood head (3) above the hood arc-shaped tongue (10); the arc-shaped upper tongue (9) and the arc-shaped upper tongue embedding groove (13) are arranged correspondingly, and the arc-shaped upper tongue (9) is movably sleeved in the arc-shaped upper tongue embedding groove (13); and hood air outlets (12) are arranged at equal intervals of arc on the hood head (3) above the arc-shaped upper tongue embedding groove (13).

3. The hood structure in the sintering flue gas multi-pollutant coordinated purification device according to claim 2 is characterized in that: The tubular hood seat (2) and the top-hat-shaped jacket (6) are connected together by spot welding.

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