High-temperature flue gas desulfurization device

Abstract

The high-temperature flue gas desulfurization device comprises an absorption tower and a smoke exhaust pipe, the smoke exhaust pipe comprises two connecting pipes and a cooling chamber, the cooling chamber is connected with the absorption tower and a rotary kiln through the two connecting pipes, a plurality of flow dividing pipes are arranged in the cooling chamber, and connecting devices are arranged at the positions, located at the two ends of the flow dividing pipes, of the cooling chamber. The connecting device is used for connecting the flow dividing pipe and the connecting pipe, and a cooling system is arranged in the cooling chamber and used for cooling the flow dividing pipe. High-temperature flue gas firstly enters the flow dividing pipe before desulfurization and is subjected to flow dividing cooling in the flow dividing pipe, then sulfur-containing flue gas is conveyed into the absorption tower through the connecting pipe for desulfurization, and due to the fact that the temperature is reduced, the corrosion of the sulfur-containing flue gas to the desulfurization tower is reduced; meanwhile, a desulfurizing agent and a catalyst in the desulfurizing tower cannot be excessively oxidized due to too high temperature, and the service life of the desulfurizing agent is prolonged.

Description

Technical Field

[0001] The present application relates to the field of flue gas desulfurization devices, and in particular to a high-temperature flue gas desulfurization device. Background Art

[0002] The rotary kiln will produce high-temperature sulfur-containing waste gas during operation, so the waste gas generated by the rotary kiln needs to be desulfurized before it can be discharged.

[0003] There are three common desulfurization methods: wet desulfurization technology, semi-dry desulfurization technology and dry desulfurization technology, named after the state of the final product.

[0004] Among them, the desulfurization efficiency of the wet flue gas desulfurization process reaches more than 90%. According to the different types of absorption towers, it can be divided into three categories: countercurrent spray tower, cocurrent packed tower and jet bubble reactor. Although the forms of the three absorption towers are different, the absorption towers are all in high temperature and high humidity conditions. Under high temperature conditions, the decomposition rate of the desulfurizer inside the absorption tower is accelerated, which in turn leads to an increase in the use cost of the absorption tower; under high temperature and high humidity conditions, the tower body of the absorption tower is easily corroded by sulfur-containing flue gas, so it is necessary to transform the absorption tower, improve the working environment of the absorption tower, and increase the service life and use cost of the absorption tower. Utility Model Content

[0005] In order to solve the problem that the working environment of the absorption tower in the wet flue gas desulfurization process is relatively harsh, resulting in high use cost and shortened service life of the absorption tower, the present application provides a high-temperature flue gas desulfurization device.

[0006] The high-temperature flue gas desulfurization device provided in this application adopts the following technical solution:

[0007] A high-temperature flue gas desulfurization device comprises an absorption tower and an exhaust pipe, wherein the exhaust pipe comprises two connecting pipes and a cooling chamber, wherein the cooling chamber is respectively connected to the tower body of the absorption tower and the exhaust pipe of a rotary kiln through the two connecting pipes, wherein a plurality of shunt pipes are arranged in the cooling chamber, and connecting devices are arranged at both ends of the shunt pipes in the cooling chamber, wherein the connecting devices are used to connect the shunt pipes and the connecting pipes, and wherein a cooling system is arranged in the cooling chamber, wherein the cooling system is used to cool the shunt pipes.

[0008] By adopting the above technical scheme, the high-temperature flue gas first enters the diversion pipe before desulfurization. After diversion and cooling in the diversion pipe, the sulfur-containing flue gas is transported to the absorption tower through the connecting pipe for desulfurization. Due to the lower temperature, the corrosiveness of the sulfur-containing flue gas to the desulfurization tower is reduced. At the same time, the desulfurizer and catalyst in the desulfurization tower will not be over-oxidized due to excessively high temperature, and the service life of the desulfurizer is extended.

[0009] Optionally, the cooling system includes a plurality of nozzles, which are installed on the inner wall of the cooling chamber. The cooling system also includes a circulating water tank and a water pump. The circulating water tank is installed at the bottom of the cooling chamber. The cooling chamber is connected to the circulating water tank, the water pump is installed in the circulating water tank, and the nozzles are connected to the water pump through water pipes.

[0010] By adopting the above technical solution, the water pump transports the water to the nozzle and sprays it out to cool the diversion pipe. The cooled water can be recycled, which is more energy-saving and environmentally friendly, and has a good cooling effect. After cooling the diversion pipe, the water sprayed from the nozzle will directly fall into the circulating water tank, which is more convenient and quick to recycle, and does not require additional pipes and additional consumption. At the same time, during the recycling process, the heat in the water will be dissipated into the air, and the water will cool faster.

[0011] Optionally, the connecting device includes a first connecting plate, a second connecting plate and a third connecting plate, the first connecting plate and the second connecting plate each having a plurality of connecting holes, the connecting holes corresponding to the shunt pipe one-to-one, the first connecting plate is installed on the cooling chamber, the second connecting plate is installed on the first connecting plate by bolts, the connecting holes on the first connecting plate and the second connecting plate correspond one-to-one, one end of the shunt pipe passes through the connecting holes one-to-one, a first sealing ring is sleeved on the shunt pipe, the first sealing ring is located between the first connecting plate and the second connecting plate, the first connecting plate and the second connecting plate both press against the first sealing ring, the third connecting plate is installed on the second connecting plate by bolts, a mounting hole is opened on the third connecting plate, one end of the connecting pipe slides through the mounting hole in cooperation, a second sealing ring is sleeved on the connecting pipe, the second sealing ring is located between the second connecting plate and the third connecting plate, and the second connecting plate and the third connecting plate both press against the second sealing ring.

[0012] By adopting the above technical solution, the first connecting plate and the second connecting plate support the diverter pipe, and the first sealing ring located between the first connecting plate and the second connecting plate is used to seal the diverter pipe and the first connecting plate and the second connecting plate, so that the smoke in the diverter pipe is not easy to leak. At the same time, the sealing structure is relatively simple, and replacement and maintenance are relatively convenient. The second connecting plate and the third connecting plate have the same effect on the connecting pipe as described above, and because both the diverter pipe and the connecting pipe have supporting points, the positions of the diverter pipe and the connecting pipe are relatively stable, and thus the connection sealing between the two is relatively stable and not easy to leak.

[0013] Optionally, an annular groove is formed on the second connecting plate, and one end of the connecting pipe is embedded in the annular groove.

[0014] By adopting the above technical solution, the annular groove is used to assist in positioning the connecting pipe, so that the connecting pipe is less likely to shake and thus damage the sealing effect.

[0015] Optionally, a sealing layer is provided in the annular groove, and the sealing layer is tightly fitted against the inner wall and the outer wall of the connecting pipe and the end surface of one end of the connecting pipe located in the annular groove.

[0016] By adopting the above technical solution, the sealing layer increases the sealing between the connecting pipe and the second connecting plate, making it more difficult for smoke to leak.

[0017] Optionally, a pressure measuring tube is installed on the side wall of the connecting tube, the pressure measuring tube is connected to the inside of the connecting tube, and a pressure gauge is sealably installed on one end of the pressure measuring tube.

[0018] By adopting the above technical solution, since the temperature of the flue gas is positively correlated with the gas pressure of the flue gas, the temperature of the sulfur-containing flue gas after cooling can be obtained by comparing the pressure difference between the two connecting pipes, and then the cooling effect of the cooling system can be adjusted in a targeted manner so that the temperature of the sulfur-containing flue gas is within an appropriate range.

[0019] Optionally, several mounting rings are provided in the cooling chamber, the diversion pipes all pass through the mounting rings, the mounting rings are connected by water pipes, the water pipes are parallel to each other and evenly distributed around the axis of the mounting rings, the water pipes are connected in parallel to the water pump, and a valve is provided on any of the water pipes.

[0020] By adopting the above technical solution, the staff can control the water flow in the water pipe through the valve, so as to control the cooling efficiency of the cooling system more conveniently.

[0021] Optionally, an exhaust pipe is installed on the side wall of the cooling chamber, a ventilation hole is opened on the side wall of the cooling chamber, the exhaust pipe is connected to the interior of the cooling chamber, and an exhaust fan is installed in the exhaust pipe, and the exhaust fan blows air in a direction away from the cooling chamber.

[0022] By adopting the above technical solution, the exhaust fan circulates air inside the cooling chamber, and accelerates the discharge of heat inside the cooling chamber to the outside atmosphere through air circulation, so that the cooling effect of the cooling system inside the cooling chamber is not easily affected by the excessively high air temperature. At the same time, if there is a leakage of sulfur-containing flue gas, since the inside of the cooling chamber is in a low-pressure state, the leaked sulfur-containing flue gas will enter the inside of the cooling chamber under the action of atmospheric pressure, and then dissolve in water. By detecting the pH value of the cooling water, it is relatively convenient to detect whether there is a leakage.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The high-temperature flue gas first enters the diversion pipe before desulfurization. After diversion and cooling in the diversion pipe, the sulfur-containing flue gas is transported to the absorption tower through the connecting pipe for desulfurization. As the temperature is reduced, the corrosiveness of the sulfur-containing flue gas to the desulfurization tower is reduced. At the same time, the desulfurizer and catalyst in the desulfurization tower will not be excessively oxidized due to excessive temperature, and the service life of the desulfurizer is extended;

[0025] 2. The water pump transports the water to the nozzle and sprays it out to cool the shunt pipe. The cooled water can be recycled, which is energy-saving and environmentally friendly, and has a good cooling effect. After cooling the shunt pipe, the water sprayed from the nozzle will directly fall into the circulating water tank, which is convenient and fast to recycle, and no additional pipes and additional consumption are required. At the same time, the heat in the water will be dissipated into the air during the recycling process, and the water will cool faster;

[0026] 3. The first connecting plate and the second connecting plate support the diverter pipe, and the first sealing ring located between the first connecting plate and the second connecting plate is used to seal the diverter pipe and the first connecting plate and the second connecting plate, so that the smoke in the diverter pipe is not easy to leak. At the same time, the sealing structure is relatively simple, and replacement and maintenance are relatively convenient. The second connecting plate and the third connecting plate have the same effect on the connecting pipe as mentioned above, and because both the diverter pipe and the connecting pipe have supporting points, the position of the diverter pipe and the connecting pipe is relatively stable, and thus the connection sealing between the two is relatively stable and not easy to leak. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional structural schematic diagram of the present application, and the absorption tower is not shown in the figure.

[0028] Figure 2 It is an exploded schematic diagram of the present application, in which the cooling chamber is cut away and the absorption tower is not shown.

[0029] Figure 3 It is a cross-sectional view of the smoke exhaust pipe of the present application.

[0030] Figure 4 yes Figure 3 Enlarged schematic diagram of part A in the middle.

[0031] Those skilled in the art will appreciate that elements in the drawings are illustrated for simplicity and clarity and are not necessarily drawn to scale. For example, the size and position of some elements in the drawings may be exaggerated relative to other elements to help improve understanding of embodiments of the present invention.

[0032] Figure numerals: 1. exhaust pipe; 2. connecting pipe; 21. pressure measuring tube; 22. pressure gauge; 3. cooling chamber; 31. mounting ring; 32. exhaust pipe; 33. exhaust fan; 34. ventilation hole; 4. diverter pipe; 5. connecting device; 51. first connecting plate; 511. connecting hole; 52. second connecting plate; 521. annular groove; 522. sealing layer; 53. third connecting plate; 531. mounting hole; 6. cooling system; 61. nozzle; 62. circulating water tank; 63. water pump; 64. water pipe; 65. valve; 7. bolt; 8. first sealing ring; 9. second sealing ring; 10. bracket. Implementation

[0033] The following is combined with Figure 1-4 This application is described in further detail.

[0034] The present application discloses a high-temperature flue gas desulfurization device, referring to Figure 1 and Figure 2 , including an absorption tower and a smoke exhaust pipe 1, the smoke exhaust pipe 1 includes a rectangular cooling chamber 3 and two connecting pipes 2, the cooling chamber 3 is in a rectangular parallelepiped shape and both ends of the cooling chamber 3 are open. A plurality of diverter pipes 4 are arranged in the cooling chamber 3, the diverter pipes 4 are parallel to each other and the axes of the diverter pipes 4 are parallel to the length direction of the cooling chamber 3.

[0035] Reference Figure 1 and Figure 2 A connecting device 5 is provided at both ends of the cooling chamber 3. The connecting device 5 includes a first connecting plate 51, a second connecting plate 52 and a third connecting plate 53 in a rectangular shape. The first connecting plate 51 is fixedly installed on the cooling chamber 3 by bolts 7 to close one end of the cooling chamber 3.

[0036] Reference Figure 2 and Figure 3 The first connecting plate 51 is provided with a plurality of connecting holes 511 corresponding to the shunt pipe 4 one by one, and one end of the shunt pipe 4 slides through the connecting hole 511 in a one-to-one manner. A first sealing ring 8 is sleeved on one end of the shunt pipe 4 passing through the connecting hole 511. The second connecting plate 52 is also provided with a plurality of connecting holes 511 corresponding to the connecting holes 511 on the first connecting plate 51. The second connecting plate 52 is fixedly mounted on the first connecting plate 51 by bolts 7, and the second connecting plate 52 presses the first sealing ring 8 against the first connecting plate, and one end of the shunt pipe 4 passes through the connecting holes 511 on the second connecting plate 52 in a one-to-one manner.

[0037] Reference Figure 2 and Figure 4The third connecting plate 53 is also fixedly mounted on the second connecting plate 52 by bolts 7, and the outer edges of the first connecting plate 51, the second connecting plate 52 and the third connecting plate 53 are aligned. A mounting hole 531 is formed through the third connecting plate 53, and one end of the connecting pipe 2 slides through the mounting hole 531, and one end of all the shunt pipes 4 is located inside one end of the connecting pipe 2. A second sealing ring 9 is sleeved on one end of the connecting pipe 2 passing through the mounting hole 531, and the third connecting plate 53 pushes the second sealing ring 9 to fit tightly against the second connecting plate 52.

[0038] Reference Figure 2 and Figure 4 An annular groove 521 is provided on one surface of the second connecting plate 52 facing the third connecting plate 53. The annular groove 521 is coaxial with the mounting hole 531. A sealing layer 522 is fixedly provided in the annular groove 521. One end of the connecting pipe 2 is fitted and embedded in the annular groove 521. The sealing layer 522 wraps the one end of the connecting pipe 2 in a close fit.

[0039] Reference Figure 2 A cooling system 6 is arranged in the cooling chamber 3. The cooling system 6 includes three mounting rings 31 and a plurality of nozzles 61. The mounting ring 31 is coaxially fixedly mounted on the inner wall of the cooling chamber 3. The axis of the mounting ring 31 is parallel to the axis of the shunt pipe 4. The shunt pipe 4 passes through the mounting ring 31. A plurality of water pipes 64 are fixedly mounted on the outer wall of the mounting ring 31. The water pipes 64 are parallel to each other, the water pipes 64 are parallel to the shunt pipe 4, and the water pipes 64 are arranged at intervals along the circumferential direction of the axis of the mounting ring 31. The nozzles 61 are evenly mounted on the water pipes 64, and the nozzles 61 on the same water pipe 64 are arranged at intervals along its length direction. The nozzles 61 spray toward the shunt pipe 4.

[0040] Reference Figure 2 and Figure 3 The cooling system 6 further includes a circulating water tank 62 and a water pump 63. The circulating water tank 62 is fixedly mounted on the bottom wall of the cooling chamber 3, and the top wall of the circulating water tank 62 is connected to the bottom wall of the cooling chamber 3. The water pump 63 is fixedly mounted in the circulating water tank 62, and a water pipe 64 is connected in parallel with the water outlet of the water pump 63. A valve 65 is fixedly mounted on each water pipe 64, and the water spraying amount of the nozzle 61 is controlled by the valve 65. A bracket 10 is fixedly mounted on the bottom of the water tank, and the bracket 10 is placed on the ground to support the cooling chamber 3 and the circulating water tank 62.

[0041] Reference Figure 1 The two connecting pipes 2 are connected to the absorption tower and the rotary kiln respectively. The sulfur-containing flue gas generated by the rotary kiln enters the cooling chamber 3 along the connecting pipe 2 and is diverted by the diverter pipe 4. At this time, the water pump 63 works to spray cooling water to the nozzle 61 to cool the sulfur-containing flue gas in the diverter pipe 4.

[0042] Reference Figure 1A pressure measuring tube 21 is fixedly installed on each of the two connecting pipes 2, and a pressure gauge 22 is sealed and fixedly installed on the pressure measuring tube 21. Since the air pressure of high-temperature flue gas is proportional to the temperature, the specific temperature drop of the flue gas can be calculated by detecting the pressure difference at the two connecting pipes 2, and then the water spraying amount of the nozzle 61 can be adjusted through the valve 65 to adjust the cooling efficiency, so that the sulfur-containing flue gas is at a suitable temperature and enters the absorption tower for desulfurization.

[0043] Reference Figure 1 An exhaust pipe 32 is integrally provided on the side wall of the cooling chamber 3, and a ventilation hole 34 is also opened on the side wall of the cooling chamber 3. An exhaust fan 33 is fixedly installed in the exhaust pipe 32 to circulate the air in the cooling chamber 3. If a leakage occurs at the connecting device 5, since the interior of the cooling chamber 3 is in a low-pressure state, the leaked sulfur-containing flue gas will enter the interior of the cooling chamber 3 under the action of the external atmospheric pressure, and then dissolve in the cooling water. By regularly detecting the pH value of the cooling water, the leakage between the connecting pipe 2 and the shunt pipe 4 can be more conveniently monitored.

[0044] The implementation principle of a high-temperature flue gas desulfurization device in an embodiment of the present application is as follows: the sulfur-containing flue gas from the rotary kiln is transported to the branch pipe 4 in the cooling chamber 3 through the connecting pipe 2, the water pump 63 is started to transport cooling water to the water pipe 64, and then the cooling water is sprayed from the nozzle 61 toward the branch pipe 4 to cool the branch pipe 4, and the cooled sulfur-containing flue gas is transported along the connecting pipe 2 to the absorption tower for absorption.

[0045] The staff calculates the temperature of the output sulfur-containing flue gas by observing the pressure difference between the two pressure gauges 22, and then adjusts the valve 65 to control the injection amount of cooling water to adjust the cooling efficiency. At the same time, the exhaust fan drives the air in the cooling chamber 3 and the outside air to circulate and dissipate heat. The staff also needs to regularly check the pH value of the cooling book to monitor whether there is leakage between the connecting pipe 2 and the shunt pipe 4.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-temperature flue gas desulfurization device, comprising an absorption tower and a flue gas exhaust pipe (1), characterized in that: The smoke exhaust pipe (1) comprises two connecting pipes (2) and a cooling chamber (3); the cooling chamber (3) is respectively connected to the tower body of the absorption tower and the exhaust pipe (32) of the rotary kiln through the two connecting pipes (2); a plurality of branch pipes (4) are arranged in the cooling chamber (3); connecting devices (5) are arranged at both ends of the branch pipe (4) in the cooling chamber (3); the connecting devices (5) are used to connect the branch pipe (4) and the connecting pipe (2); a cooling system (6) is arranged in the cooling chamber (3); the cooling system (6) is used to cool the branch pipe (4).

2. A high temperature flue gas desulfurization device according to claim 1, characterized in that: The cooling system (6) comprises a plurality of nozzles (61), wherein the nozzles (61) are mounted on the inner wall of the cooling chamber (3). The cooling system (6) further comprises a circulating water tank (62) and a water pump (63), wherein the circulating water tank (62) is mounted at the bottom of the cooling chamber (3), the cooling chamber (3) is connected to the circulating water tank (62), the water pump (63) is mounted in the circulating water tank (62), and the nozzles (61) are connected to the water pump (63) via a water pipe (64).

3. A high temperature flue gas desulfurization device according to claim 1, characterized in that: The connecting device (5) comprises a first connecting plate (51), a second connecting plate (52) and a third connecting plate (53); the first connecting plate (51) and the second connecting plate (52) are each provided with a plurality of connecting holes (511); the connecting holes (511) correspond one-to-one to the flow diverter pipes (4); the first connecting plate (51) is mounted on the cooling chamber (3); the second connecting plate (52) is mounted on the first connecting plate (51) by means of bolts (7); the connecting holes (511) on the first connecting plate (51) and the second connecting plate (52) correspond one-to-one; one end of the flow diverter pipes (4) passes through the connecting holes (511) one-to-one; a first sealing ring (8) is sleeved on the flow diverter pipes (4); The first sealing ring (8) is located between the first connecting plate (51) and the second connecting plate (52), and the first connecting plate (51) and the second connecting plate (52) are both tightly pressed against the first sealing ring (8). The third connecting plate (53) is mounted on the second connecting plate (52) by means of bolts (7), and a mounting hole (531) is provided on the third connecting plate (53), and one end of the connecting pipe (2) is slidably passed through the mounting hole (531). A second sealing ring (9) is sleeved on the connecting pipe (2), and the second sealing ring (9) is located between the second connecting plate (52) and the third connecting plate (53), and the second connecting plate (52) and the third connecting plate (53) are both tightly pressed against the second sealing ring (9).

4. A high temperature flue gas desulfurization device according to claim 3, characterized in that: The second connecting plate (52) is provided with an annular groove (521), and one end of the connecting pipe (2) is fitted and embedded in the annular groove (521).

5. A high temperature flue gas desulfurization device according to claim 4, characterized in that: A sealing layer (522) is provided in the annular groove (521), and the sealing layer (522) is tightly fitted against the inner wall and the outer wall of the connecting tube (2) and the end surface of one end of the connecting tube (2) located in the annular groove (521).

6. A high temperature flue gas desulfurization device according to claim 2, characterized in that: A pressure measuring tube (21) is installed on the side wall of the connecting tube (2), the pressure measuring tube (21) is in communication with the interior of the connecting tube (2), and a pressure gauge (22) is sealedly installed on one end of the pressure measuring tube (21).

7. A high temperature flue gas desulfurization device according to claim 6, characterized in that: A plurality of mounting rings (31) are provided in the cooling chamber (3), the flow distribution pipes (4) all pass through the mounting rings (31), the mounting rings (31) are connected by water pipes (64), the water pipes (64) are parallel to each other and evenly distributed around the axis of the mounting ring (31), the water pipes (64) are connected in parallel to the water pump (63), and a valve (65) is provided on any of the water pipes (64).

8. A high temperature flue gas desulfurization device according to claim 1, characterized in that: An exhaust pipe (32) is installed on the side wall of the cooling chamber (3), a ventilation hole (34) is opened on the side wall of the cooling chamber (3), the exhaust pipe (32) is connected to the interior of the cooling chamber (3), and an exhaust fan (33) is installed in the exhaust pipe (32), and the exhaust fan (33) discharges air in a direction away from the cooling chamber (3).

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