A flue gas condensation and demisting device

Abstract

A flue gas condensation de-whitening and demisting device, characterized in that: it is installed above a granulation tower or an exhaust chimney, and includes an air heat exchange condenser, an exhaust fan, and an air mixing chamber arranged in sequence from bottom to top; the air heat exchange condenser includes a shell and a heat exchange tube, an air passage with a closed lower end and an open upper end is formed in the middle of the shell, a heat exchange chamber is formed around the outer side, an air inlet is formed at the lower end of the outer side wall of the heat exchange chamber, and an air outlet is formed at the upper end of the inner side wall of the heat exchange chamber; the heat exchange tubes are evenly and densely installed in the heat exchange chamber and are vertically arranged, the lower end of the heat exchange tubes is connected to the granulation tower or the exhaust chimney, and the upper end is connected to the air mixing chamber. The advantage is that the air heat exchange condenser, the exhaust fan, the air mixing chamber and the granulation tower or the exhaust chimney are directly integrated into one, and the exhaust fan can simultaneously attract two media, namely, external air and evaporated water mist, which not only occupies a smaller area, but also has low equipment investment and operating costs, greatly reducing costs.

Description

Technical Field

[0001] The invention relates to a whitening and demisting device, and in particular to a flue gas condensation whitening and demisting device. Background Art

[0002] During the blast furnace smelting production process, a large amount of evaporated water mist will be generated during the water quenching and slag flushing process of 1400 to 1500 ℃ blast furnace slag. The water mist temperature is about 70-90 ℃. Since the water mist contains corrosive compounds such as sulfur, it has a great impact on the surrounding environment. Water mist rain often occurs, corroding and polluting the steel structure and equipment on site. In response to this problem, many de-whitening technologies have emerged, which not only solve the environmental pollution problem, but also recycle the water in the evaporated water mist. However, the shortcoming of these de-whitening devices is that they need to use fans to lead the evaporated water mist in the granulation tower or exhaust chimney through pipelines to the condensation heat exchange chamber, and then enter the mixing chamber through the fan, and then discharge into the atmosphere. Not only does it occupy a large area, but it also has high equipment investment and operating costs. Summary of the invention

[0003] In order to overcome the shortcomings of the background technology, the present invention provides a flue gas condensation de-whitening and demisting device to solve the problems of large footprint and high cost of the existing de-whitening technology.

[0004] The technical solution adopted by the present invention is: a flue gas condensation, de-whitening and demisting device, which is installed above a granulation tower or an exhaust chimney, and includes an air heat exchange condenser, an exhaust fan, and an air mixing chamber arranged in sequence from bottom to top; the air heat exchange condenser includes an outer shell and a heat exchange tube, an air passage which is closed at the lower end and open at the upper end is formed in the middle of the outer shell, a heat exchange chamber is formed around the outer side, an air inlet is formed at the lower end of the outer side wall of the heat exchange chamber, and an air outlet is formed at the upper end of the inner side wall of the heat exchange chamber; the heat exchange tubes are evenly and densely installed in the heat exchange chamber and are vertically arranged, the lower end of the heat exchange tubes is connected to the granulation tower or the exhaust chimney, and the upper end is connected to the air mixing chamber.

[0005] An air volume regulating device for regulating the air volume is provided at the air inlet.

[0006] The cross section of the shell is annular, the air inlet is a strip-shaped structure and is evenly arranged along the circumference of the outer side wall of the shell, and the air outlet is a strip-shaped structure and is evenly arranged along the circumference of the inner side wall of the shell.

[0007] An air volume regulating device for regulating the air volume is provided at the air inlet, and the air volume regulating device comprises an regulating door, an annular toggle plate, and an regulating toggle connecting rod; the middle part of the regulating door is hinged at the air inlet through a rotating shaft, the annular toggle plate is rotatably arranged along the center of the granulating tower or the exhaust chimney, the regulating door and the annular toggle plate are connected through an regulating toggle connecting rod, and the annular toggle plate is connected to a power source for driving it to rotate.

[0008] The exhaust fan includes a plurality of circumferentially evenly distributed air-inducing blades, wherein the air-inducing blades include inner blades corresponding to the air passages, and outer blades located outside the inner blades and extending above the heat exchange chamber.

[0009] Corresponding cylindrical bosses are formed on the inner blades and the outer blades, and the cylindrical bosses of the inner blades and the outer blades are connected to each other in a relatively rotatable manner via a connector.

[0010] The connecting body comprises two semicircular ring-shaped connecting pieces, and the two connecting pieces are fastened and connected by bolts to clamp the cylindrical boss.

[0011] The air mixing chamber comprises an outer cylinder and an inner cylinder arranged at the center of the outer cylinder. The inner wall of the outer cylinder and the outer wall of the inner cylinder are further provided with guide plates with a spiral structure.

[0012] A spray atomizing nozzle is also provided below the air heat exchange condenser, and the spray atomizing nozzle is connected to the blast furnace water supply system through a pipeline.

[0013] The beneficial effects of the present invention are as follows: by adopting the above scheme, the air heat exchange condenser, the exhaust fan, the air mixing chamber and the granulation tower or the exhaust chimney are directly integrated into one, so that the structure is more compact, and through the ingenious structural design of the air heat exchange condenser, the exhaust fan can simultaneously attract two media, namely, the outside air and the evaporated water mist, without the need for an additional induced draft fan to induce the evaporated water mist, which not only occupies a smaller area, but also has low equipment investment and operating costs, thereby greatly reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The structure of the smoke condensation and demisting device according to the embodiment of the present invention is shown in FIG. Figure 1 .

[0015] Figure 2 The structure of the smoke condensation and demisting device according to the embodiment of the present invention is shown in FIG. Figure 2 .

[0016] Figure 3 It is a cross-sectional view of an air heat exchange condenser according to an embodiment of the present invention.

[0017] Figure 4 It is a structural schematic diagram of a flue gas condensation de-whitening and demisting device with an air volume regulating device according to an embodiment of the present invention.

[0018] Figure 5 It is a schematic structural diagram of an air volume regulating device according to an embodiment of the present invention.

[0019] Figure 6 for Figure 5 A magnified schematic diagram of center A.

[0020] Figure 7It is a schematic structural diagram of an exhaust fan according to an embodiment of the present invention.

[0021] Figure 8 Schematic diagram of the structure of a connector according to an embodiment of the present invention.

[0022] Fig. 9 Schematic diagram of the structure of the air mixing chamber according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0024] like Figure 1-3 As shown, a flue gas condensation whitening and demisting device is installed above the granulation tower 1, and includes an air heat exchange condenser 2, an exhaust fan 3, and an air mixing chamber 4 arranged in sequence from bottom to top; the air heat exchange condenser 2 includes a shell 21 and a heat exchange tube 22, an air passage 211 with a closed lower end and a conductive upper end is formed in the middle of the shell 21, and a heat exchange chamber 212 is formed around the outer side, an air inlet 213 is formed at the lower end of the outer side wall of the heat exchange chamber 212, and an air outlet 214 is formed at the upper end of the inner side wall of the heat exchange chamber 212; the heat exchange tube 22 is evenly and densely installed in the heat exchange chamber and is vertically arranged, the lower end of the heat exchange tube 22 is connected to the granulation tower 1 or the exhaust chimney, and the upper end is connected to the air mixing chamber 4.

[0025] The cross section of the shell 21 is annular or square, which is compatible with the granulating tower 1. In this embodiment, it is an annular structure. Further, the air inlet 213 is a strip structure and is evenly arranged along the outer side wall of the shell 21. The air outlet 214 is a strip structure and is evenly arranged along the inner side wall of the shell 21, ensuring better rapid and balanced air circulation, ensuring effective and rapid heat exchange effect in the heat exchange chamber 212, and ensuring that the evaporated water mist is effectively condensed and dehydrated.

[0026] A spray atomizing nozzle 6 is also provided below the air heat exchange condenser 2. The spray atomizing nozzle 6 is connected to the blast furnace water supply system through a pipeline. The spray atomizing nozzle 6 is directly used for spraying and misting in the granulation tower to cool and condense part of the evaporated water mist, perform cooling pretreatment on the evaporated water mist, and further ensure the sufficient and rapid condensation effect of the evaporated water mist.

[0027] The exhaust fan 3 adopts a wing-shaped exhaust fan similar to that used for cooling towers, which has the advantages of large air volume, high total pressure, high efficiency, stable rotation, long service life, corrosion resistance, and easy maintenance.

[0028] During the blast furnace smelting production process, blast furnace slag at 1400 to 1500°C enters the granulation tower for water quenching, and the generated 70-90°C evaporated water mist will rise along the granulation tower 1. The rising evaporated water mist will first be sprayed by the spray atomizing nozzle 6 to achieve preliminary cooling, and then enter the heat exchange tube 22. At the same time, the exhaust fan 3 is turned on. The exhaust fan 3 can not only draw the external cold air into the heat exchange chamber 212 through the air inlet 213, thereby forming heat exchange with the evaporated water mist in the heat exchange tube 22, but also can further attract the evaporated water mist to rise.

[0029] The evaporated water mist in the heat exchange tube 22 is cooled by the cold air outside the heat exchange tube 22, thereby realizing condensation and dehydration of the evaporated water mist. The condensed water formed by condensation can flow directly back to the granulation tower slag water along the heat exchange tube 22 to achieve recycling, and the dehydrated evaporated water mist will continue to rise and enter the air mixing chamber 4. At the same time, the air after heat exchange in the heat exchange chamber 212 will go out of the air outlet 21 and enter the air channel 211 under the action of the exhaust fan 3, and rise into the air mixing chamber 4. The evaporated water mist and the hot air can mix with each other to reduce the relative humidity of the mixed gas and ensure that the gas is in an unsaturated state, thereby achieving the goal of not forming water mist during discharge.

[0030] The above-mentioned flue gas condensation whitening and demisting device directly integrates the air heat exchange condenser 2, the exhaust fan 3, the mixing chamber 4 and the granulation tower 1 into one, making the structure more compact. Moreover, through the ingenious structural design of the air heat exchange condenser 2, the exhaust fan 3 can attract the evaporated water mist while attracting the outside air, so that one exhaust fan 3 can attract both the outside air and the evaporated water mist at the same time, and no additional induced draft fan is required to induce the evaporated water mist. Not only does it occupy a smaller area, but it also has low equipment investment and operating costs, thereby greatly reducing costs.

[0031] In addition, when the mixing ratio of evaporated mist and hot air is within a certain range, a better de-whitening effect can be achieved. Therefore, in order to improve the de-whitening effect, the flow rates of evaporated mist and hot air can also be adjusted and controlled to maintain a suitable mixing ratio of evaporated mist and hot air.

[0032] like Figure 4-6 As shown, an air volume regulating device 5 is provided at the air inlet 213, through which the air flow rate entering the heat exchange chamber can be adjusted, thereby controlling the flow rate of hot air, and better adjusting the mixing ratio of evaporated mist and hot air to ensure the de-whitening effect.

[0033] Specifically, the air volume regulating device 5 includes an adjusting door 51, an annular toggle plate 52, and an adjusting toggle connecting rod 53; the middle part of the adjusting door 51 is hinged at the air inlet 213 through a rotating shaft 54, and the annular toggle plate 52 is rotatably arranged along the center of the granulating tower 1 or the exhaust chimney. The adjusting door 51 and the annular toggle plate 52 are connected through an adjusting toggle connecting rod 53, and the annular toggle plate 52 is connected to a power source for driving it to rotate. The power source is usually a cylinder or a hydraulic cylinder. The annular toggle plate 52 is driven by the power source to reciprocate, and the annular toggle plate 52 drives the adjusting door 51 to rotate along the rotating shaft 54 ​​through the adjusting toggle connecting rod 53, thereby realizing the opening of the air inlet 213 and realizing air volume regulation.

[0034] like Figure 7-8 As shown, in addition to regulating the air flow, the induced draft blades of the exhaust fan 3 can also be specially designed to achieve the regulation of the evaporated mist.

[0035] Specifically, the induced draft blades are designed to be a two-body structure, i.e., an inner blade 31 and an outer blade 32. The inner blade 31 corresponds to the air channel 211 and is used to attract air to meet the air flow design requirements. The outer blade is arranged on the outside of the inner blade 31 and extends to the top of the heat exchange chamber 212 to attract evaporated mist to meet the evaporated mist flow and pressure requirements.

[0036] Furthermore, the inner blade 31 and the outer blade 32 are of a split structure and are relatively rotatably connected via a connector 33. Specifically, corresponding cylindrical bosses 34 are formed on the inner blade 31 and the outer blade 32. The connector 33 includes two semi-circular connecting parts 331. The two connecting parts 331 are fastened and connected by bolts 332 to clamp the cylindrical boss 34. This structure enables the outer blade 32 to be manually adjusted, and the inclination angle is changed to adjust the air volume, thereby controlling the flow rate of the evaporated mist, better adjusting the mixing ratio of the evaporated mist and the hot air, and ensuring the whitening effect.

[0037] like Fig. 9 As shown, the air mixing chamber 4 includes an outer cylinder 41 and an inner cylinder 42 arranged at the center of the outer cylinder 41. The inner wall of the outer cylinder 41 and the outer wall of the inner cylinder 42 are also provided with a guide plate 43 with a spiral structure. In the air mixing chamber 4, the evaporated water mist after condensation and dehydration is mixed with the hot air. Due to the spiral guide plate, the mixed air flow rises in a spiral manner, which not only achieves a better mixing effect, but also the spirally rising mixed air flow forms a certain negative pressure on the evaporated water mist in the heat exchange, which is more conducive to the discharge of the evaporated water mist along the granulation tower.

[0038] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0040] Technical personnel should note that although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A flue gas condensation and demisting device, characterized in that: It is installed above the granulation tower (1) or the exhaust chimney, and comprises an air heat exchange condenser (2), an exhaust fan (3), and an air mixing chamber (4) which are arranged in sequence from bottom to top; The air heat exchange condenser (2) comprises a shell (21) and a heat exchange tube (22); an air passage (211) with a closed lower end and an open upper end is formed in the middle of the shell (21); a heat exchange chamber (212) is formed around the outer periphery; an air inlet (213) is formed at the lower end of the outer side wall of the heat exchange chamber (212); and an air outlet (214) is formed at the upper end of the inner side wall of the heat exchange chamber (212); The heat exchange tubes (22) are evenly and densely installed in the heat exchange chamber (212) and are arranged vertically. The lower ends of the heat exchange tubes (22) are connected to the granulation tower (1) or the exhaust chimney, and the upper ends are connected to the air mixing chamber (4).

2. The smoke condensation and demisting device according to claim 1 is characterized in that: An air volume regulating device (5) for regulating the air volume is provided at the air inlet (213).

3. The smoke condensation and demisting device according to claim 1 is characterized in that: The cross section of the outer shell (21) is annular, the air inlet (213) is strip-shaped and evenly arranged along the circumference of the outer side wall of the outer shell (21), and the air outlet (214) is strip-shaped and evenly arranged along the circumference of the inner side wall of the outer shell (21).

4. The smoke condensation and demisting device according to claim 3 is characterized in that: An air volume regulating device (5) for regulating the air volume is provided at the air inlet (213), and the air volume regulating device (5) comprises an regulating door (51), an annular toggle plate (52), and an regulating toggle connecting rod (53); the middle portion of the regulating door (51) is hinged to the air inlet (213) via a rotating shaft (54); the annular toggle plate (52) is rotatably arranged along the center of the granulating tower (1) or the exhaust chimney; the regulating door (51) and the annular toggle plate (52) are connected via the regulating toggle connecting rod (53), and the annular toggle plate (52) is connected to a power source for driving the annular toggle plate (52) to rotate.

5. The smoke condensation and demisting device according to claim 1 is characterized in that: The exhaust fan (3) comprises a plurality of circumferentially evenly distributed air-inducing blades, the air-inducing blades comprising inner blades (31) corresponding to the air passage (211), and outer blades (32) located outside the inner blades (31) and extending above the heat exchange chamber (212).

6. The smoke condensation and demisting device according to claim 5 is characterized in that: The inner blade (31) and the outer blade (32) are both formed with corresponding cylindrical bosses (34), and the cylindrical bosses (34) of the inner blade (31) and the outer blade (32) are connected to each other in a relatively rotatable manner via a connecting body (33).

7. The smoke condensation and demisting device according to claim 6 is characterized in that: The connecting body (33) comprises two semi-circular connecting pieces (331), and the two connecting pieces (331) are fastened and connected by bolts (332) to clamp the cylindrical boss (34).

8. The smoke condensation and demisting device according to claim 1 is characterized in that: The air mixing chamber (4) comprises an outer cylinder (41) and an inner cylinder (42) arranged at the center of the outer cylinder (41), and guide plates (43) with a spiral structure are also provided on the inner wall of the outer cylinder (41) and the outer wall of the inner cylinder (42).

9. The smoke condensation demisting device according to claim 1 is characterized in that: A spray atomizing nozzle (6) is also provided below the air heat exchange condenser (2), and the spray atomizing nozzle (6) is connected to the blast furnace water supply system through a pipeline.

Images