Tail gas treatment flue structure of incinerator

Abstract

The application discloses a flue structure for treating tail gas of an incineration device, and solves the problem that the difficulty of a transformation process is relatively high when a subsequent treatment device is added to an existing incineration device, and the technical scheme is as follows: the incineration device is connected with a chimney, the flue structure comprises an outgoing flue and a returning flue; the outgoing flue penetrates through the chimney, and the outgoing flue is connected with the incineration device and an alkali washing device at two ends respectively; one end of the returning flue is connected with the alkali washing device, and the other end extends into the chimney. The application can achieve the purpose of adding the subsequent treatment device without changing the original equipment layout, and reduces the difficulty of the transformation process.

Description

Technical Field

[0001] This invention belongs to the field of flue gas treatment technology, and more specifically, relates to a flue structure for treating exhaust gas from an incineration device. Background Technology

[0002] In the past 20 years, the sulfur recovery equipment built in my country has produced sulfur dioxide emissions that are often too high after incineration. This does not meet the current environmental standards for sulfur-containing waste gas in various regions. Therefore, the high-sulfur waste gas needs to be introduced into alkaline scrubbing equipment to reduce the sulfur content to within the environmental standards before being emitted.

[0003] The existing design directly discharges exhaust gas into the chimney. However, in order to meet the site layout design requirements of the combustion device, the space between the combustion device and the chimney is usually small, which cannot meet the layout of the flue gas outlet structure and is not convenient for the layout of the flue gas alkaline scrubbing device. This greatly increases the construction difficulty and cost of adding alkaline scrubbing equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a flue structure for treating exhaust gas in an incineration device. By connecting the flue through the chimney body and linking the combustion device and the alkaline scrubbing device, the flue gas can be rationally drawn out for treatment, thereby reducing sulfide emissions.

[0005] To achieve the above objectives, the present invention provides a flue structure for treating exhaust gas from an incineration device, wherein the incineration device is connected to a chimney, and the flue structure includes an outlet flue and a return flue.

[0006] The exhaust flue passes through the chimney, and its two ends are connected to the incineration device and the alkaline washing device, respectively.

[0007] One end of the return flue is connected to the alkaline washing device, and the other end extends into the chimney.

[0008] Preferably, the flue includes a constricted flue, a flue pipe, and a flue gas outlet pipe connected in sequence. The open end of the constricted flue is connected to the tail flue of the incineration device, and the narrow end of the constricted flue is connected to the flue pipe. One end of the flue gas outlet pipe is located inside the chimney and connected to the flue pipe, and the other end passes through the side wall of the chimney and is connected to the alkaline washing device.

[0009] Preferably, the sidewall of the chimney is provided with a first through hole for the flue gas outlet pipe to pass through and a second through hole for the return flue to pass through. An annular first connector is provided on the outer side of the first through hole, and a first flange is connected to the first connector. The flue gas outlet pipe is provided with a first fixed flange connected to the first flange. An annular second connector is provided on the outer side of the second through hole, and a second flange is connected to the second connector. The return flue is provided with a second fixed flange connected to the second flange.

[0010] Preferably, a first insulation blanket is filled between the inner circumference of the first connector and the outer wall of the flue gas outlet pipe, and between the inner circumference of the second connector and the outer wall of the return flue. A second insulation blanket is sealed and filled between the wall of the first through hole and the flue gas outlet pipe, and between the wall of the second through hole and the return flue.

[0011] Preferably, the outer wall of the chimney is provided with a connecting steel plate, and the first connecting member and the second connecting member are both welded to the connecting steel plate. A first sealing strip is provided between the first flange and the first fixed flange, and a second sealing strip is provided between the second flange and the second fixed flange.

[0012] Preferably, one end of the flue gas outlet pipe is fitted with a third flange and an annular third connector, the third connector and the third flange are connected, and one end of the flue pipe is provided with a third fixed flange connected to the third flange.

[0013] Preferably, a third insulation blanket is filled between the inner circumference of the third connector and the outer wall of the flue pipe, and a third sealing strip is provided between the third flange and the third fixed flange.

[0014] Preferably, the inner or outer wall of the flue pipe is provided with a heat insulation layer.

[0015] Preferably, the diameter of the open end of the constricted flue matches the diameter of the tail flue, and the diameter of the narrow end of the constricted flue matches the diameter of the flue pipe.

[0016] Preferably, the return flue is located above the outlet flue, the return flue and the outlet flue are horizontally arranged, the bottom of the constricted flue is flush with the bottom of the flue pipe, the top of the constricted flue is an inclined structure, and the angle between the top and the horizontal direction is 20°-60°.

[0017] The advantages of this invention over the prior art are as follows: By connecting the flue through the chimney, this invention avoids the problems of complicated modifications to the tail flue of the incineration device, the connection between the tail flue and the chimney, and the original opening of the chimney, as well as the limitation of modification space that prevents the exhaust of flue gas. Furthermore, it can exhaust the flue gas that cannot be directly emitted to post-treatment equipment such as alkaline scrubbing, thereby reducing pollutants such as sulfur and nitrogen oxides to within the environmental protection requirements.

[0018] Meanwhile, the use of thermal insulation blankets at the sealing flange structure achieves the functions of releasing expansion and sealing; moreover, the structure of this invention is simple, practical, and easy to modify and construct.

[0019] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0020] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure at point A in the middle;

[0023] Figure 3 for Figure 2 A sectional view of the CC section in the image.

[0024] In the diagram: 1. Tail flue; 2. Chimney; 3. Narrow flue; 4. Flue pipe; 5. Insulation layer; 6. First connector; 7. First flange; 8. Second connector; 9. Second flange; 10. Third connector; 11. Third flange; 12. First insulation blanket; 13. Second insulation blanket; 14. Third insulation blanket; 15. Connecting steel plate; 16. Flue gas outlet pipe; 17. Return flue. Detailed Implementation

[0025] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0026] Reference Appendix Figure 1-3 This embodiment provides a flue structure for treating exhaust gas from an incineration device. The incineration device is connected to a chimney 2, and the flue structure includes an outgoing flue and a return flue 17.

[0027] The exhaust flue passes through the chimney 2, and its two ends are connected to the incineration device and the alkaline washing device, respectively.

[0028] One end of the return flue 17 is connected to the alkaline washing device, and the other end extends into the chimney 2.

[0029] Specifically, by having the flue gas outlet run through the chimney, the complex modifications to the tail flue of the incineration unit, the connection between the tail flue and the chimney, and the original opening of the chimney can be avoided. This saves the space occupied by the flue gas outlet structure and does not change the original equipment layout.

[0030] Preferably, the flue includes a constricted flue 3, a flue pipe 4, and a flue gas outlet pipe 16 connected in sequence. The open end of the constricted flue 3 is connected to the tail flue 1 of the incineration device, and the narrow end of the constricted flue 3 is connected to the flue pipe 4. One end of the flue gas outlet pipe 16 is located inside the chimney 2 and connected to the flue pipe 4, and the other end passes through the side wall of the chimney 2 and is connected to the alkaline washing device.

[0031] Specifically, the flue pipe 4 can be made of carbon steel, stainless steel, composite steel or non-metallic materials, and a corrugated expansion joint or non-metallic expansion joint is provided on the flue pipe 4 to release thermal expansion.

[0032] Preferably, the side wall of the chimney 2 is provided with a first through hole for the flue gas outlet pipe 16 to pass through and a second through hole for the return flue duct 17 to pass through. An annular first connector 6 is provided on the outer side of the first through hole, and a first flange 7 is connected to the first connector 6. The flue gas outlet pipe 16 is provided with a first fixed flange connected to the first flange 7. An annular second connector 8 is provided on the outer side of the second through hole, and a second flange 9 is connected to the second connector 8. The return flue duct 17 is provided with a second fixed flange connected to the second flange 9.

[0033] One end of the flue gas outlet pipe 16 is fitted with a third flange 11 and an annular third connector 10, the third connector 10 and the third flange 11 are connected, and one end of the flue pipe 4 is provided with a third fixed flange connected to the third flange 11.

[0034] Specifically, the connection between flue pipe 4 and flue gas outlet pipe 16, as well as between return flue 17 and chimney 2, adopts a socket connection method, which can effectively release thermal expansion and ensure reliable sealing; flue pipe 4 and flue gas outlet pipe 16 can also be connected by a corrugated expansion joint, which can also achieve the purpose of releasing thermal expansion.

[0035] The aforementioned connectors and pipes are either welded together or form an integral structure, and the flanges and connectors are either welded together or form an integral structure.

[0036] The first and second through holes can be square, racetrack-shaped, or round. In this embodiment, both the first and second through holes are round openings. The first and second through holes can be the chimney's own cleaning port or existing openings to save on modification steps. The flue pipe 4, the flue gas outlet pipe 16, and the return flue 17 are all round pipes.

[0037] Preferably, a first insulation blanket 12 is filled between the inner circumference of the first connector 6 and the outer wall of the flue gas outlet pipe 16, and between the inner circumference of the second connector 8 and the outer wall of the return flue duct 17. A second insulation blanket 13 is sealed and filled between the wall of the first through hole and the flue gas outlet pipe 16, and between the wall of the second through hole and the return flue duct 17.

[0038] Specifically, both the first insulation blanket 12 and the second insulation blanket 13 use non-metallic fillers, which can absorb thermal expansion while increasing the sealing and insulation effect.

[0039] Preferably, the outer wall of the chimney 2 is provided with a connecting steel plate 15, and the first connecting member 6 and the second connecting member 8 are both welded to the connecting steel plate 15. A first sealing strip is provided between the first flange 7 and the first fixed flange, and a second sealing strip is provided between the second flange 9 and the second fixed flange.

[0040] Specifically, the connecting steel plate 15 is welded to the outer wall of the chimney 2; the flange and the fixed flange are connected by bolts and nuts, and a sealing strip is added between the flange and the connecting parts to enhance the heat preservation and sealing effect.

[0041] Preferably, a third insulation blanket 14 is provided between the inner circumference of the third connector 10 and the outer wall of the flue pipe 4, and a third sealing strip is provided between the third flange 11 and the third fixed flange.

[0042] Preferably, the inner or outer wall of the flue pipe 4 is provided with a heat insulation layer.

[0043] Specifically, if the insulation layer 5 is an inner insulation layer, it can be made of castable refractory, anti-corrosion paint, ceramic fiber material, or a metal heat insulation cover; if the insulation layer 5 is an outer insulation layer, it can be made of castable refractory, anti-corrosion paint, ceramic fiber material, or a metal heat insulation cover. The insulation layer 5 can prevent heat loss of flue gas in the flue pipe 4.

[0044] Preferably, the diameter of the open end of the constricted flue 3 matches the diameter of the tail flue 1, and the diameter of the narrow end of the constricted flue 3 matches the diameter of the flue pipe 4.

[0045] Specifically, the diameter of the open end of the constricted flue 3 is the same as the diameter of the tail flue 1, and the diameter of the narrow end of the constricted flue 3 is the same as the diameter of the flue pipe 4. Pipes with the same diameter are easy to connect and assemble, and the sealing effect is better after assembly.

[0046] Preferably, the return flue 17 is located above the outlet flue, the return flue 17 and the outlet flue are horizontally arranged, the bottom of the constricted flue 3 is flush with the bottom of the flue pipe 4, the top of the constricted flue 3 is an inclined structure, and the angle between the top and the horizontal direction is 20°-60°.

[0047] Specifically, the return flue 17 is located above the flue pipe 4 to prevent the low-temperature flue gas discharged from the return flue 17 from passing through the flue pipe 4, thereby reducing the temperature of the high-temperature flue gas in the flue pipe 4 and affecting the reaction efficiency in the subsequent alkaline washing process. In this embodiment, the angle between the top and the horizontal direction is 30°.

[0048] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A flue gas treatment structure for an incineration device, characterized in that, The incineration device is connected to a chimney (2), and the flue structure includes an outgoing flue and a return flue (17); The exhaust flue passes through the chimney (2), and the two ends of the exhaust flue are respectively connected to the incineration device and the alkaline washing device; One end of the return flue (17) is connected to the alkaline washing device, and the other end extends into the chimney (2); The exhaust flue includes a constricted flue (3), a flue pipe (4), and a flue gas outlet pipe (16) connected in sequence. The open end of the constricted flue (3) is connected to the tail flue (1) of the incineration device, and the narrow end of the constricted flue (3) is connected to the flue pipe (4). One end of the flue gas outlet pipe (16) is located inside the chimney (2) and connected to the flue pipe (4), and the other end passes through the side wall of the chimney (2) and is connected to the alkaline washing device. The inner or outer wall of the flue pipe (4) is provided with a heat insulation layer (5); The flue pipe and the flue gas outlet pipe are connected by a socket.

2. The flue gas treatment structure of the incineration device according to claim 1, characterized in that, The chimney (2) has a first through hole for the flue gas outlet pipe (16) to pass through and a second through hole for the return flue (17) to pass through. The first through hole has an annular first connector (6) on its axial outer side. A first flange (7) is connected to the first connector (6). The flue gas outlet pipe (16) is provided with a first fixed flange connected to the first flange (7). The second through hole has an annular second connector (8) on its axial outer side. A second flange (9) is connected to the second connector (8). The return flue (17) is provided with a second fixed flange connected to the second flange (9).

3. The flue gas treatment structure of the incineration device according to claim 2, characterized in that, The inner circumference of the first connector (6) and the outer wall of the flue gas outlet pipe (16) and the inner circumference of the second connector (8) and the outer wall of the return flue (17) are both filled with a first insulation blanket (12). The wall of the first through hole and the flue gas outlet pipe (16) and the wall of the second through hole and the return flue (17) are both sealed and filled with a second insulation blanket (13).

4. The flue gas treatment structure of the incineration device according to claim 2, characterized in that, The outer wall of the chimney (2) is provided with a connecting steel plate (15). The first connecting piece (6) and the second connecting piece (8) are both welded to the connecting steel plate (15). A first sealing strip is provided between the first flange (7) and the first fixed flange, and a second sealing strip is provided between the second flange (9) and the second fixed flange.

5. The flue gas treatment structure of the incineration device according to claim 1, characterized in that, One end of the flue gas outlet pipe (16) is fitted with a third flange (11) and an annular third connector (10), the third connector (10) and the third flange (11) are connected, and one end of the flue pipe (4) is provided with a third fixed flange connected to the third flange (11).

6. The flue gas treatment structure of the incineration device according to claim 5, characterized in that, A third insulation blanket (14) is filled between the inner circumference of the third connector (10) and the outer wall of the flue pipe (4), and a third sealing strip is provided between the third flange (11) and the third fixed flange.

7. The flue gas treatment structure of the incineration device according to claim 1, characterized in that, The diameter of the open end of the constricted flue (3) matches the diameter of the tail flue (1), and the diameter of the narrow end of the constricted flue (3) matches the diameter of the flue pipe (4).

8. The flue gas treatment structure of the incineration device according to claim 1, characterized in that, The return flue (17) is located above the outlet flue. The return flue (17) and the outlet flue are set horizontally. The bottom of the constricted flue (3) is flush with the bottom of the flue pipe (4). The top of the constricted flue (3) is an inclined structure. The angle between the top and the horizontal direction is 20°-60°.

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