Flue gas mixing device

Abstract

The application provides a flue gas mixing device, a flue pipe is inserted into a barrel cavity of a barrel, a pipe end of the flue pipe is close to a barrel bottom of the barrel, an air inlet is formed on a barrel wall of the barrel, an annular sealing plate is arranged at a barrel opening of the barrel, an inner ring of the annular sealing plate is in sealing cooperation with an outer peripheral wall of an inner pipe, an annular cavity is formed between the flue pipe and the barrel, and the flue pipe is provided with distributed air holes and air pipes which are in communication with the inside and outside of the flue pipe, and the air holes and the air pipes are staggered. The flue gas entering the flue pipe is increased, and the position of the flue gas entering the flue pipe is dispersed, so that the energy consumption of flue gas mixing is reduced.

Description

Technical Field

[0001] This invention specifically relates to a flue gas mixing device. Background Technology

[0002] In the process of producing acid from copper smelting flue gas, it is necessary to mix the flue gas evenly. Nowadays, gas mixing devices often use methods such as pipe welding, adding baffles inside the pipe, and expanding the gas mixing cavity to allow the gas to diffuse and mix within the gas mixing device cavity. However, the above-mentioned gas mixing devices are prone to problems such as insufficient uniformity of flue gas mixing and high airflow resistance.

[0003] In the scheme disclosed in the document entitled "Flue Gas Mixing Generator" (Document No. CN107570001A, hereinafter referred to as Document 1), there is a cylinder 1 and a turbulence device 2 installed inside the cylinder 1. The guide plate is arranged on a fixed frame, and the flue gas is uniformly mixed under the guidance and constraint of the guide plate.

[0004] The scheme disclosed in the document entitled "Flue Gas Mixing Device" (Document No. CN106440835A, hereinafter referred to as Document 2) discloses at least two mixing cylinders connected in series, a turbulence structure 3 located on the inner wall of each mixing cylinder, a flue gas inlet and a flue gas outlet 5. Under the combined action of the diameter change at the junction of adjacent mixing cylinders and the turbulence structure 3 on the inner wall of the mixing cylinder, the airflow is mixed with each other.

[0005] The aforementioned references 1 and 2, as common flue gas mixing schemes, share the common feature that during the process of flue gas entering and being transported within the flue pipe, the flow direction is changed and mixed by components such as baffles or turbulence plates inside the flue pipe cavity. The schemes provided in references 1 and 2 not only increase flow resistance and consume a lot of energy, but also make it difficult to maintain the baffles or turbulence plates inside the cavity during use. Summary of the Invention

[0006] The purpose of this invention is to provide a flue gas mixing device that increases the channels for flue gas to enter the flue pipe and disperses the positions where flue gas enters the flue pipe, thereby reducing the energy consumption of flue gas mixing.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A flue gas mixing device includes an exhaust pipe inserted into the cavity of a cylindrical body with its end close to the bottom of the body. The core of the exhaust pipe and the core of the cylindrical body are arranged coaxially. An air inlet is opened on the wall of the cylindrical body, and an annular sealing plate is provided at the opening of the cylindrical body. The inner ring of the annular sealing plate is sealed to the outer circumferential wall of the inner pipe. An annular cavity is formed between the exhaust pipe and the cylindrical body. The wall of the exhaust pipe has vent holes and vent pipes that connect the inside and outside of the exhaust pipe, and the vent holes and vent pipes are arranged alternately.

[0009] In the above scheme, the upstream flue pipe delivers the flue gas into the cylinder and fills the annular chamber formed between the exhaust pipe and the cylinder. With the help of the vent holes and vent pipes on the wall of the exhaust pipe, the flue gas enters the exhaust pipe from almost all directions and positions of the exhaust pipe wall in the cylinder, achieving full mixing of the flue gas. Furthermore, the low flow resistance of the flue gas in the annular chamber between the exhaust pipe and the cylinder, which allows the flue gas to directly enter the exhaust pipe, facilitates rapid flow of the flue gas and further improves the uniformity of mixing. Attached Figure Description

[0010] Figure 1 A three-dimensional structural diagram of a flue gas mixing device;

[0011] Figure 2 This is a top view of the flue gas mixing device;

[0012] Figure 3 for Figure 2 A sectional view along the A-A' direction. Detailed Implementation

[0013] See Figures 1-3 The flue gas mixing device shown has an exhaust pipe 20 inserted into the cavity of a cylinder 10 with its end close to the bottom 13 of the cylinder 10. The core of the exhaust pipe 20 and the core of the cylinder 10 are arranged coaxially. An air inlet 11 is opened on the cylinder wall of the cylinder 10. An annular sealing plate 12 is provided at the cylinder opening of the cylinder 10. The inner ring of the annular sealing plate 12 is sealed to the outer peripheral wall of the inner pipe 20. An annular cavity is formed between the exhaust pipe 20 and the cylinder 10. Ventilation holes 21 and ventilation pipes 22 are distributed on the pipe wall of the exhaust pipe 20, which connect the inside and outside of the exhaust pipe 20. The ventilation holes 21 and ventilation pipes 22 are arranged alternately.

[0014] The flue gas generated during the copper smelting process is transported to the acid production workshop after dust removal and connected to the air inlet 11 on the wall of the cylinder 10. The flue gas then fills the annular cavity between the exhaust pipe 20 and the cylinder 10. With the help of the vent holes 21 and vent pipes 22 on the wall of the exhaust pipe 20, the flue gas enters the exhaust pipe 20 from almost all directions and positions on the wall of the exhaust pipe 20 inside the cylinder 10, achieving full mixing of the flue gas. Furthermore, the low flow resistance of the flue gas in the annular cavity between the exhaust pipe 20 and the cylinder 10 directly entering the exhaust pipe 20 facilitates rapid flow of the flue gas, further improving the uniformity of mixing.

[0015] One end of the vent pipe 22 on the exhaust pipe 20 is fixed to the exhaust pipe 20, and the other end extends suspended towards the middle of the core of the exhaust pipe 20. The suspended arrangement of the vent pipe 22 on the exhaust pipe 20 ensures that the position of the vent pipe 22 inside the exhaust pipe 20, i.e., the suspended end of the vent pipe 22, maintains a certain distance from the vent hole 21 on the pipe wall of the exhaust pipe 20, which is conducive to the full mixing of the flue gas.

[0016] The ventilation pipes 22 are arranged in unit ventilation pipe rows at intervals along the core direction on the exhaust pipe 20, and ventilation holes 21 are evenly distributed on the pipe wall between the unit ventilation pipe rows at intervals in the circumferential range.

[0017] The exhaust pipes 20 are arranged vertically as columns, and ventilation pipes 22 are arranged along the generatrix of the exhaust pipes 20 to form a pipe column, i.e. a unit ventilation pipe column. Since the length direction of the ventilation pipes 22 is basically consistent with the radial direction of the exhaust pipes 20, the inner ends of the ventilation pipes 22 in two adjacent columns in the circumferential direction are close, while the outer ends maintain a certain arc length distance in the circumferential direction. Within this arc length distance range, ventilation holes 21 are opened, thereby significantly increasing the channels or paths for flue gas to enter the exhaust pipes 20.

[0018] Preferably, the overhang lengths of the vent pipes 22 in adjacent unit vent pipe rows are different, while the lengths of the vent pipes 22 in the same unit vent pipe row are the same. This scheme ensures that the different positions of the outlet ends of the vent pipes 22 facilitate flue gas mixing, and avoids interference between the inner ends of the vent pipes 22 when their outer ends are basically flush with or slightly convex to the outer wall of the exhaust pipe 20. This improves the efficiency of the welding connection between the vent pipes 22 and the exhaust pipe 20; otherwise, it would be necessary to frequently select vent pipes 22 of appropriate length for welding to the exhaust pipe 20. Figure 2 As shown, there are a total of 9 rows of ventilation tubes in the unit.

[0019] See Figure 1 , 3 The section of the exhaust pipe 20 inserted into the cylinder 10 is a conical pipe with the same taper as the cylinder wall of the cylinder 10. Since the outer end of the vent pipe 22 is basically flush with or slightly convex with the outer wall of the exhaust pipe 20, and the conical exhaust pipe 20 and the cylinder 10 are interlocked, it is easy to separate the two so as to collect and treat the smoke and dust and clean the vent hole 21 and the vent pipe 22.

[0020] To eliminate the leakage of smoke from the gap between the exhaust pipe 20 and the annular sealing plate 12, a sealing filler 30 is provided between the exhaust pipe 20 and the annular sealing plate 12. To ensure the sealing effect of the sealing filler, an annular pressure plate can be added to the outside of the sealing filler. The annular pressure plate and the annular sealing plate 12 can be connected in a detachable manner. Since this solution is very easy to implement, it is not shown in the figure.

Claims

1. A flue gas mixing device, characterized in that: The exhaust pipe (20) is inserted into the cavity of the cylinder (10) and the end of the exhaust pipe (20) is close to the bottom (13) of the cylinder (10). The core of the exhaust pipe (20) and the core of the cylinder (10) are arranged in the same core. The cylinder (10) has an air inlet (11) on its wall. The cylinder (10) has an annular sealing plate (12) at its opening. The inner ring of the annular sealing plate (12) is sealed to the outer circumference of the inner pipe (20). The exhaust pipe (20) and the cylinder (10) form an annular cavity. The exhaust pipe (20) has a ventilation hole (21) and a ventilation pipe (22) connecting the inside and outside of the exhaust pipe (20). The ventilation hole (21) and the ventilation pipe (22) are arranged alternately.

2. The flue gas mixing device according to claim 1, characterized in that: One end of the ventilation pipe (22) on the exhaust pipe (20) is fixed to the exhaust pipe (20), and the other end is suspended and extended to the middle of the core of the exhaust pipe (20).

3. The flue gas mixing device according to claim 1, characterized in that: The ventilation pipe (22) is arranged in a unit ventilation pipe row at intervals along the core direction on the exhaust pipe (20), and ventilation holes (21) are evenly distributed on the pipe wall between the unit ventilation pipe rows arranged at intervals in the circumferential range.

4. The flue gas mixing device according to claim 3, characterized in that: The overhang lengths of the vent tubes (22) in adjacent unit vent tube rows are different, while the lengths of the vent tubes (22) in the same unit vent tube row are the same.

5. The flue gas mixing device according to claim 1, 2, 3, or 4, characterized in that: The section of the exhaust pipe (20) inserted into the cylinder (10) is a conical pipe with the same taper as the cylinder wall (10).

6. The flue gas mixing device according to claim 5, characterized in that: There is a sealing filler (30) between the exhaust pipe (20) and the annular sealing plate (12).

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