Flue gas treatment waste heat recovery device

Abstract

The utility model relates to a flue gas treatment waste heat recovery device, which belongs to the technical field of flue gas treatment and comprises a heat exchanger and a cooling treatment spray tower, a flue gas outlet pipe is arranged on the upper portion of the heat exchanger, a flue gas inlet pipe is arranged on the lower portion of the heat exchanger, and an air distribution ring pipe communicated with the flue gas inlet pipe is arranged on the inner side wall of the lower portion of the heat exchanger. A plurality of air outlets spraying air downwards are formed in the inner side of the air distribution ring pipe, a liquid collecting partition plate dividing the cooling treatment spray tower into an upper part and a lower part is fixed to the upper middle portion of the cooling treatment spray tower, the liquid collecting partition plate is in a step shape, and a first sprayer, a first filler layer, a second sprayer, a cooling water inlet pipe, a second filler layer and a first air distribution disc are arranged in the cooling treatment spray tower. Flue gas entering the heat exchanger is evenly distributed on the lower portion of the heat exchanger through the air distribution ring pipe, the air outlets spraying air downwards are formed in the inner side of the air distribution ring pipe, the time of the flue gas in the heat exchanger can be prolonged, the heat exchange effect is improved, cooling treatment is conducted before spraying treatment, and the flue gas treatment effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to a flue gas treatment waste heat recovery device, belonging to the technical field of flue gas treatment. Background Art

[0002] In the daily production process of steel mills and ceramic factories, kilns will generate a lot of flue gas, which contains a lot of heat energy. If this heat energy is not recycled, it will cause serious waste of heat energy. At present, the waste heat recovery of flue gas is to pass it into a heat exchanger for heat exchange before spraying treatment to recover the waste heat. However, the flue gas is unevenly distributed when entering the heat exchanger, which affects the heat exchange effect. In addition, it is not cooled before entering the spray tower, which easily affects the treatment effect of the flue gas. Utility Model Content

[0003] The utility model provides a flue gas treatment waste heat recovery device to solve the problems that the flue gas in the current device is unevenly distributed when entering the heat exchanger, affecting the heat exchange effect, and is not cooled before entering the spray tower, which easily affects the treatment effect of the flue gas.

[0004] The utility model relates to a flue gas treatment waste heat recovery device, comprising a heat exchanger and a cooling treatment spray tower, wherein a heat exchange liquid outlet pipe and a heat exchange liquid inlet pipe are respectively arranged at the top and bottom of the heat exchanger, an air outlet pipe is arranged at the top of the cooling treatment spray tower, a liquid outlet pipe is arranged at the bottom of the cooling treatment spray tower, a plurality of heat exchange pipes connected with the heat exchange liquid outlet pipe and the heat exchange liquid inlet pipe are arranged in the heat exchanger, a smoke outlet pipe connected with the lower part of the cooling treatment spray tower is arranged at the upper part of the heat exchanger, a smoke inlet pipe is arranged at the lower part of the heat exchanger, an air distribution ring pipe connected with the smoke inlet pipe is arranged on the inner side wall of the lower part of the heat exchanger, a plurality of air outlets spraying downward are arranged on the inner side of the air distribution ring pipe, a solid gas outlet is arranged at the middle and upper part of the cooling treatment spray tower, and a smoke outlet pipe is arranged at the lower part of the heat exchanger. There must be a liquid collecting partition which divides it into two parts, the upper and lower parts. The liquid collecting partition is stepped. The cooling treatment spray tower at the lower end of the liquid collecting partition is connected with a liquid extraction pipe, the liquid extraction pipe is connected with a buffer tank, the buffer tank is connected with a reflux pipe, the reflux pipe is provided with a liquid pump, the upper part of the reflux pipe extends to the upper part of the cooling treatment spray tower and is fixedly connected with a sprayer 1, a packing layer 1 is provided below the sprayer 1, a ventilation pipe is fixed to the higher end of the liquid collecting partition, a sprayer 2 is provided below the liquid collecting partition, the sprayer 2 is connected with a cooling water inlet pipe, a packing layer 2 is provided below the sprayer 2, a hollow air distribution plate 1 connected to the smoke outlet pipe is provided below the packing layer 2, and smoke outlet holes are evenly provided at the bottom of the air distribution plate 1.

[0005] As a preferred embodiment, a positioning boss is provided at the bottom of the air distribution ring tube, and a plurality of support plates are provided at the lower part of the air distribution ring tube. The support plates are provided with positioning grooves that cooperate with the positioning bosses. A fixing groove for inserting the support plates is provided on the inner side wall of the heat exchanger, which can quickly locate the air spray direction of the air outlet on the air distribution ring tube.

[0006] As a preferred embodiment, a hollow air distribution plate 2 is fixed on the top of the ventilation duct. The top of the air distribution plate 2 is conical, and air outlet holes are evenly arranged on the bottom of the air distribution plate 2, which can evenly distribute the air discharged from the ventilation duct and increase the effect of the smoke spray treatment.

[0007] As a preferred embodiment, sprayer 1 and sprayer 2 both include a conical spray barrel, a hemispherical spray head is fixed at the bottom of the spray barrel, spray holes are evenly arranged on the spray head, a plurality of liquid distribution plates are fixed in the spray barrel, the diameter of the liquid distribution holes on the upper liquid distribution plate is larger than the diameter of the liquid distribution holes on the lower liquid distribution plate, the spray treatment liquid and cooling water can be distributed once through the plurality of liquid distribution plates, and then sprayed out through the spray holes on the spray head, the liquid distribution is more even, and the cooling and treatment effects are better.

[0008] As a preferred embodiment, a filter box is provided on the smoke inlet pipe, and an inlet and outlet are provided on the top of the filter box. A plurality of filter plates are provided inside the inlet and outlet along the axial direction of the smoke inlet pipe. The bottom of the filter plate is in contact with the bottom inner wall of the filter box. A detachable cover plate for closing the inlet and outlet is fixed on the top of the filter plate. A sealing gasket is provided between the cover plate and the top wall of the filter box. The front and rear side walls of the filter plate are in contact with the front and rear inner walls of the filter box. The smoke entering the heat exchanger can be filtered to filter out sticky particles in the smoke, so as to prevent the sticky particles from sticking to the outside of the heat exchange tube and affecting the heat exchange effect. The filter plate can also be conveniently pulled out for cleaning.

[0009] The utility model has the following beneficial effects:

[0010] The flue gas entering the heat exchanger is evenly distributed in the lower part of the heat exchanger through the air distribution ring pipe, and a plurality of downward air outlets are provided on the inner side of the air distribution ring pipe, which can increase the time of the flue gas in the heat exchanger and increase the heat exchange effect. In addition, the treatment spray setting and the cooling spray setting are arranged at the upper and lower positions of a spray tower, which can save installation space, and the cooling treatment is performed before the spraying treatment to ensure the flue gas treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a structural schematic diagram of the liquid collecting partition;

[0013] Figure 3 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0014] Figure 4 It is a structural schematic diagram of the filter box;

[0015] Figure 5 for Figure 1 A schematic diagram of the enlarged structure at B in the middle;

[0016] Figure 6 for Figure 1 Schematic diagram of the enlarged structure at C in the middle;

[0017] In the figure: 1. cooling treatment spray tower; 2. spray barrel; 3. spray head; 4. packing layer one; 5. air distribution plate two; 6. liquid collecting partition; 7. cooling water inlet pipe; 8. packing layer two; 9. air distribution plate one; 10. heat exchange tube; 11. air distribution ring tube; 12. support plate; 13. smoke inlet pipe; 14. filter box; 15. liquid pump; 16. buffer tank; 17. ventilation pipe; 18. liquid distribution plate; 19. spray hole; 20. filter plate; 21. cover plate; 22. positioning boss; 23. fixing groove; 24. heat exchanger. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with embodiments.

[0019] Embodiment 1, as Figures 1 to 6 As shown, the utility model is a flue gas treatment waste heat recovery device, including a heat exchanger 24 and a cooling treatment spray tower 1, the top and bottom of the heat exchanger 24 are respectively provided with a heat exchange liquid outlet pipe and a heat exchange liquid inlet pipe, the top of the cooling treatment spray tower 1 is provided with an air outlet pipe, the bottom of the cooling treatment spray tower 1 is provided with a liquid outlet pipe, a plurality of heat exchange tubes 10 connected with the heat exchange liquid outlet pipe and the heat exchange liquid inlet pipe are provided in the heat exchanger 24, a smoke outlet pipe connected with the lower part of the cooling treatment spray tower 1 is provided at the upper part of the heat exchanger 24, a smoke inlet pipe 13 is provided at the lower part of the heat exchanger 24, an air distribution ring pipe 11 connected with the smoke inlet pipe 13 is provided on the inner side wall of the lower part of the heat exchanger 24, a plurality of air outlets for spraying air downward are provided on the inner side of the air distribution ring pipe 11, and the cooling treatment spray tower 1 is provided with a plurality of air outlets for spraying air downward. A liquid collecting partition 6 is fixed to the upper middle part to divide it into two parts, the upper and lower parts. The liquid collecting partition 6 is stepped. The cooling treatment spray tower 1 at the lower end of the liquid collecting partition 6 is connected to a liquid extraction pipe, the liquid extraction pipe is connected to a buffer tank 16, the buffer tank 16 is connected to a reflux pipe, the reflux pipe is provided with a liquid pump 15, the upper part of the reflux pipe extends to the upper part of the cooling treatment spray tower 1 and is fixedly connected to a sprayer 1, a packing layer 4 is provided below the sprayer 1, a ventilation pipe 17 is fixed to the higher end of the liquid collecting partition 6, a sprayer 2 is provided below the liquid collecting partition 6, the sprayer 2 is connected to a cooling water inlet pipe 7, a packing layer 2 8 is provided below the sprayer 2, a hollow air distribution plate 9 connected to the smoke outlet pipe is provided below the packing layer 2 8, and smoke outlet holes are evenly provided at the bottom of the air distribution plate 9.

[0020] During use, the flue gas enters the air distribution ring tube 11 through the smoke inlet pipe 13, and is then discharged toward the bottom at the air outlet. The flue gas discharged from the air outlet avoids the outermost heat exchange tube 10, and then moves upward and contacts the heat exchange tube 10 for heat exchange. The cold water entering from the heat exchange liquid inlet pipe will be discharged from the heat exchange liquid inlet pipe into the steam generator or reboiler for treatment after absorbing heat energy, which is convenient for subsequent utilization. The flue gas after heat exchange enters the lower part of the cooling treatment spray tower 1 from the smoke outlet pipe, and then the flue gas is evenly distributed from the air distribution plate 9 and contacts the cooling water sprayed by the sprayer 2 in the packing layer 8 to cool the flue gas. Then the flue gas enters the upper part of the cooling treatment spray tower 1 through the ventilation pipe 17, and then contacts the treatment agent sprayed by the sprayer 1 in the packing layer 4 for flue gas treatment. Then the flue gas is discharged from the air outlet pipe, and the liquid collecting partition 6 will collect the flowing treatment agent, and then it is discharged into the buffer tank 16, and the liquid supply pump 15 circulates and sprays.

[0021] Embodiment 2, based on Embodiment 1, a positioning boss 22 is provided at the bottom of the air distribution ring tube 11, a plurality of support plates 12 are provided at the lower part of the air distribution ring tube 11, a positioning groove cooperating with the positioning boss 22 is provided on the support plate 12, and a fixing groove 23 for inserting the support plate 12 is provided on the inner wall of the heat exchanger 24.

[0022] A hollow air distribution plate 2 5 is fixed on the top of the ventilation pipe 17 . The top of the air distribution plate 2 5 is conical, and air outlet holes are evenly arranged on the bottom of the air distribution plate 2 5 .

[0023] Both sprayer 1 and sprayer 2 include a conical spray barrel 2, a hemispherical spray head 3 is fixed at the bottom of the spray barrel 2, and spray holes 19 are evenly arranged on the spray head 3. A plurality of liquid distribution plates 18 are fixed in the spray barrel 2, and the diameter of the liquid distribution holes on the upper liquid distribution plate 18 is larger than the diameter of the liquid distribution holes on the lower liquid distribution plate 18.

[0024] A filter box 14 is provided on the smoke inlet pipe 13. An inlet and outlet are provided on the top of the filter box 14. A plurality of filter plates 20 are provided in the inlet and outlet along the axial direction of the smoke inlet pipe 13. The bottom of the filter plate 20 contacts the bottom inner wall of the filter box 14. A detachable cover plate 21 for closing the inlet and outlet is fixed on the top of the filter plate 20. A sealing gasket is provided between the cover plate 21 and the top wall of the filter box 14. The front and rear side walls of the filter plate 20 contact the front and rear inner walls of the filter box 14. When cleaning the filter plate 20, unscrew the bolts on the cover plate 21, then pull the cover plate 21 upwards, remove the filter plate 20, and then clean it. After cleaning, insert the filter plate 20 back into the inlet and outlet, then press down the cover plate 21, so that the bottom of the filter plate 20 contacts the bottom inner wall of the filter box 14, and then tighten the bolts to fix it.

[0025] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0026] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

Claims

1. A flue gas treatment waste heat recovery device, comprising a heat exchanger (24) and a cooling treatment spray tower (1), wherein a heat exchange liquid outlet pipe and a heat exchange liquid inlet pipe are respectively provided at the top and bottom of the heat exchanger (24), an air outlet pipe is provided at the top of the cooling treatment spray tower (1), and a liquid outlet pipe is provided at the bottom of the cooling treatment spray tower (1), a plurality of heat exchange pipes (10) connected to the heat exchange liquid outlet pipe and the heat exchange liquid inlet pipe are provided in the heat exchanger (24), a smoke outlet pipe connected to the lower part of the cooling treatment spray tower (1) is provided at the upper part of the heat exchanger (24), and a smoke inlet pipe (13) is provided at the lower part of the heat exchanger (24), characterized in that: An air distribution ring pipe (11) connected to the smoke inlet pipe (13) is provided on the inner wall of the lower part of the heat exchanger (24). A plurality of air outlets for spraying air downward are provided on the inner side of the air distribution ring pipe (11). A liquid collecting partition (6) is fixed to the middle and upper part of the cooling treatment spray tower (1) to divide it into upper and lower parts. The liquid collecting partition (6) is stepped. The cooling treatment spray tower (1) at the lower end of the liquid collecting partition (6) is connected to a liquid extraction pipe. The liquid extraction pipe is connected to a buffer tank (16). The buffer tank (16) is connected to a return pipe. The return pipe is provided with A liquid pump (15) is provided, the upper part of the reflux pipe extends to the upper part of the cooling treatment spray tower (1) and is fixedly connected to a sprayer 1, a packing layer 1 (4) is provided below the sprayer 1, a ventilation pipe (17) is fixed to the higher end of the liquid collecting partition (6), a sprayer 2 is provided below the liquid collecting partition (6), the sprayer 2 is connected to a cooling water inlet pipe (7), a packing layer 2 (8) is provided below the sprayer 2, a hollow air distribution plate 1 (9) connected to a smoke outlet pipe is provided below the packing layer 2 (8), and smoke outlet holes are evenly arranged at the bottom of the air distribution plate 1 (9).

2. The flue gas treatment waste heat recovery device according to claim 1, characterized in that: A positioning boss (22) is provided at the bottom of the air distribution ring tube (11), a plurality of support plates (12) are provided at the lower portion of the air distribution ring tube (11), positioning grooves matching the positioning bosses (22) are provided on the support plates (12), and fixing grooves (23) for inserting the support plates (12) are provided on the inner side walls of the heat exchanger (24).

3. The flue gas treatment waste heat recovery device according to claim 1, characterized in that: A hollow air distribution plate 2 (5) is fixed on the top of the ventilation pipe (17); the top of the air distribution plate 2 (5) is conical, and air outlet holes are evenly arranged on the bottom of the air distribution plate 2 (5).

4. The flue gas treatment waste heat recovery device according to claim 1, characterized in that: The first sprayer and the second sprayer both comprise a conical spray barrel (2), a hemispherical spray head (3) being fixed at the bottom of the spray barrel (2), spray holes (19) being evenly arranged on the spray head (3), a plurality of liquid distribution plates (18) being fixed inside the spray barrel (2), the diameter of the liquid distribution holes on the upper liquid distribution plate (18) being larger than the diameter of the liquid distribution holes on the lower liquid distribution plate (18).

5. The flue gas treatment waste heat recovery device according to claim 4, characterized in that: A filter box (14) is provided on the smoke inlet pipe (13); an inlet and outlet are provided on the top of the filter box (14); a plurality of filter plates (20) are provided in the inlet and outlet along the axial direction of the smoke inlet pipe (13); the bottom of the filter plate (20) contacts the bottom inner wall of the filter box (14); a detachable cover plate (21) for sealing the inlet and outlet is fixed on the top of the filter plate (20); a sealing gasket is provided between the cover plate (21) and the top wall of the filter box (14); and the front and rear side walls of the filter plate (20) contact the front and rear inner walls of the filter box (14).

Images