Boiler flue gas desulfurization tower

Abstract

The utility model belongs to the technical field of desulfurization devices, and relates to a boiler flue gas desulfurization tower, which comprises a cylindrical tower body, a spray layer, a filler layer, a demister and a sieve tray, the side lower part of the tower body is communicated with a gas inlet pipe, the top of the tower body is provided with an exhaust pipe, the bottom of the tower body is provided with a liquid collecting tank, the exhaust pipe is arranged above the liquid collecting tank, and the sieve tray is arranged above the exhaust pipe. The demister is arranged below the exhaust pipe, the spraying layer and the packing layer are arranged between the sieve plate and the demister, the left end and the right end of the sieve plate are rotationally connected with the tower body through rotating shafts respectively, one rotating shaft penetrates through the tower body to be in transmission connection with a driving device, and the other rotating shaft penetrates through the tower body to be detachably connected with a limiting assembly; and a sealing assembly in sliding contact with the inner wall of the tower body is arranged on the periphery of the sieve pore plate. According to the device, on-line overturning of the sieve tray can be realized, so that dust, gypsum and other sediments on the sieve tray can be efficiently cleaned under the non-stop condition, the running resistance of the device can be reduced, and the desulfurization efficiency of the device can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of desulfurization devices, and in particular relates to a boiler flue gas desulfurization tower. Background Art

[0002] A boiler flue gas desulfurization tower is a device used to desulfurize boiler exhaust gases. Most are tower-type equipment, also known as a desulfurization tower. Its purpose is to remove sulfur and compounds (primarily sulfur dioxide) from flue gas to meet environmental requirements. It is suitable for various industries, such as the chemical industry, metallurgy, and power industry.

[0003] Existing boiler flue gas desulfurization towers include dry desulfurization towers, semi-dry desulfurization towers, and wet desulfurization towers. Wet desulfurization towers include dual-alkali, magnesium, calcium, sodium, ammonia, and organic alkali methods. Currently, dual-alkali wet desulfurization tower technology is relatively mature and widely used due to its relatively high desulfurization efficiency. Traditional dual-alkali wet desulfurization towers are usually equipped with a fixed sieve plate below the spray layer to evenly distribute the airflow and increase the gas-liquid contact time. However, as the operating time increases, dust in the flue gas and a small amount of gypsum produced during the desulfurization process will deposit on the sieve plate, affecting the desulfurization efficiency and increasing the operating resistance of the desulfurization tower flue gas system. Online cleaning is impossible and requires regular shutdown for cleaning.

[0004] Therefore, it is urgent for people in this field to optimize the existing boiler flue gas desulfurization tower to solve the problem of online cleaning after dust and gypsum deposition on the sieve plate. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a boiler flue gas desulfurization tower, comprising a cylindrical tower body, a spray layer, a packing layer, a demister and a sieve plate, the lower side of the tower body is connected to an air inlet pipe, an exhaust pipe is provided on the top, and a liquid collecting tank is provided at the bottom of the tower body, the exhaust pipe is provided above the liquid collecting tank, the sieve plate is provided above the exhaust pipe, the demister is provided below the exhaust pipe, the spray layer and the packing layer are provided between the sieve plate and the demister, the sieve plate is disc-shaped, and the left and right ends of the sieve plate are respectively rotatably connected to the tower body by rotating shafts, the rotating shaft is sealed with the tower body, one of the rotating shafts passes through the tower body and is connected to a driving device for transmission, and the other rotating shaft passes through the tower body and can be detached from a limiting component, the outer periphery of the sieve plate is provided with a sealing component in sliding contact with the inner wall of the tower body, and after the limiting component is disengaged from the corresponding rotating shaft, the driving device can drive the sieve plate to flip 180 degrees.

[0006] Preferably, the driving device adopts a servo motor, and the output shaft of the servo motor is connected to the rotating shaft at the corresponding end through a coupling. By setting up the servo motor, the flipping angle of the sieve plate can be accurately controlled.

[0007] Preferably, the limiting assembly includes a first telescopic rod, which is connected to the side wall of the tower body through a limiting support, and the telescopic end of the first telescopic rod is a rectangular structure. A rectangular plug interface matching the telescopic end of the first telescopic rod is provided on the rotating shaft at the corresponding end of the limiting assembly, which is used to limit and fix the sieve plate when it is placed horizontally.

[0008] Preferably, the sealing assembly includes an upper ring groove and a lower ring groove symmetrically arranged on the side wall of the sieve plate, and an annular corrosion-resistant airbag is provided in the upper ring groove and the lower ring groove. The annular corrosion-resistant airbag is provided with an inflation port, and an embedded sealing plug is provided at the inflation port. This arrangement can ensure the sealing of the sieve plate and the inner wall of the tower body when the sieve plate is working normally, and can also isolate the rotating shaft from the flue gas, thereby extending the service life of the rotating shaft.

[0009] Preferably, the rotating shaft is disposed between the upper and lower annular grooves, and auxiliary limiting holes are symmetrically provided at the front and rear ends of the sieve plate. Second telescopic rods are symmetrically provided on the front and rear side walls of the tower body, and the telescopic ends of the second telescopic rods slide through the side walls of the tower body and are detachable from the auxiliary limiting holes. The provision of the auxiliary limiting holes and the second telescopic rod further improves the stability of the sieve plate during normal operation. When the sieve plate needs to be flipped, the second telescopic rod is simply retracted. After the sieve plate is flipped into place, the second telescopic rod is reset to achieve auxiliary limiting of the sieve plate.

[0010] Preferably, the first telescopic rod and the second telescopic rod are both electric telescopic rods or pneumatic telescopic rods, which are easy to operate.

[0011] Preferably, the spray layer and the packing layer are respectively provided with two layers, and a spray layer is correspondingly provided above each packing layer, which helps to improve the desulfurization efficiency.

[0012] Preferably, the spray layer includes a spray grid tube and atomizing nozzles evenly distributed at the bottom of the spray grid tube. The liquid inlet of the spray grid tube is connected to a spray liquid main pipe, and the spray liquid main pipe is connected to an external spray liquid supply pipe.

[0013] Preferably, a side-entry agitator is provided in the liquid collecting tank, and a liquid discharge port is provided at the bottom side of the liquid collecting tank, and a pH detector is provided at the liquid discharge port.

[0014] The present invention also includes other devices or components that can enable the boiler flue gas desulfurization tower to operate normally, which are all conventional technical means in the field. In addition, the devices or components not limited in the present invention all adopt conventional technical means in the field.

[0015] The working principle of the present utility model is that the boiler flue gas enters the tower body through the air inlet pipe, flows evenly through the sieve plate and contacts the spray liquid flowing through the sieve plate, then passes upward through the packing layer, spray layer and demisting layer in sequence, and is finally drawn into the chimney through the exhaust port and the external induced draft fan for discharge. In the case that the resistance of the flue gas inside the device increases significantly during the operation of the device, the limit assembly can be disengaged from the rotating shaft at the corresponding end of the sieve plate, and then the sieve plate is driven by the driving device to flip 180 degrees, so that the material deposited on the sieve plate can fall into the liquid collecting tank under the action of gravity and the flushing of the flue gas, thereby reducing the resistance of the flue gas inside the device. After the sieve plate is reversed, the limit assembly is reset to ensure the stability of the sieve plate after flipping. In order to ensure the stability of the unit operation during the flipping process, the sieve plate flipping operation can be performed under low boiler load.

[0016] The beneficial effect of the present invention is that the device can realize online flipping of the sieve plate, thereby achieving efficient cleaning of dust, gypsum and other deposits on the sieve plate without stopping the machine, which helps to reduce the operating resistance of the device and improve the desulfurization efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model in Example 1.

[0019] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure of part A.

[0020] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure of part B.

[0021] Figure 4 This is a schematic diagram of the top view of the sieve plate in Example 2. DETAILED DESCRIPTION

[0022] The present invention is described below in conjunction with the accompanying drawings and specific embodiments of the present invention. The description herein is intended only to explain the present invention and is not intended to limit the present invention. Based on the embodiments of the present invention, any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without creative work to all other embodiments obtained based on the embodiments of the present invention shall be included within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figures 1 to 3As shown, the utility model provides a boiler flue gas desulfurization tower, including a cylindrical tower body 1, a spray layer 2, a packing layer 3, a demister 4 and a sieve plate 5. The lower side of the tower body is connected with an air inlet pipe 6, an exhaust pipe 7 is provided on the top, and a liquid collecting tank 8 is provided at the bottom of the tower body. The exhaust pipe is arranged above the liquid collecting tank, the sieve plate is arranged above the exhaust pipe, and the demister is arranged below the exhaust pipe. The spray layer and the packing layer are arranged between the sieve plate and the demister. The sieve plate is disc-shaped, and the left and right ends of the sieve plate are respectively rotatably connected to the tower body by a rotating shaft 9. The rotating shaft is sealed with the tower body, one of the rotating shafts passes through the tower body and is connected to a driving device 10 for transmission, and the other rotating shaft passes through the tower body and can be detached from a limiting component. The outer periphery of the sieve plate is provided with a sealing component that is in sliding contact with the inner wall of the tower body. After the limiting component is detached from the corresponding rotating shaft, the driving device can drive the sieve plate to flip 180 degrees.

[0025] Specifically, the driving device adopts a servo motor, and the output shaft of the servo motor is connected to the rotating shaft at the corresponding end through a coupling. By setting the servo motor, the flipping angle of the sieve plate can be accurately controlled.

[0026] In this embodiment, the limiting assembly includes a first telescopic rod 11, which is connected to the side wall of the tower body through a limiting support 12, and the telescopic end of the first telescopic rod is a rectangular structure. A rectangular plug interface matching the telescopic end of the first telescopic rod is provided on the rotating shaft at the corresponding end of the limiting assembly, which is used to limit and fix the sieve plate when it is placed horizontally.

[0027] More specifically, the sealing assembly includes an upper annular groove 13 and a lower annular groove 14 symmetrically arranged on the side wall of the sieve plate. An annular corrosion-resistant airbag 15 is provided in each of the upper and lower annular grooves. Each of the annular corrosion-resistant airbags is provided with an inflation port (not shown in the figure), and an embedded sealing plug (not shown in the figure) is provided at the inflation port. The rotating shaft is provided between the upper and lower annular grooves. This arrangement ensures the sealing between the sieve plate and the inner wall of the tower body when the sieve plate is operating normally, while also isolating the rotating shaft from the flue gas, thereby extending the service life of the rotating shaft. In addition, the first telescopic rod is an electric telescopic rod, which is easy to operate.

[0028] In this embodiment, the spray layer and packing layer are each comprised of two layers, with a corresponding spray layer positioned above each packing layer, which helps improve desulfurization efficiency. The spray layer comprises a spray grid tube and atomizing nozzles evenly distributed across the bottom of the spray grid tube. The liquid inlet of the spray grid tube is connected to a spray liquid main pipe 16, which is in communication with an external spray liquid supply pipe (not shown). The sump is equipped with a side-entry agitator 17, and a drain port 18 is located at the bottom of the sump, where a pH meter is located.

[0029] The working principle of the present utility model is that the boiler flue gas enters the tower body through the air inlet pipe, flows evenly through the sieve plate and contacts the spray liquid flowing through the sieve plate, then passes upward through the packing layer, spray layer and demisting layer in sequence, and is finally drawn into the chimney through the exhaust port and the external induced draft fan for discharge. In the case that the resistance of the flue gas inside the device increases significantly during the operation of the device, the limit assembly can be disengaged from the rotating shaft at the corresponding end of the sieve plate, and then the sieve plate is driven by the driving device to flip 180 degrees, so that the material deposited on the sieve plate can fall into the liquid collecting tank under the action of gravity and the flushing of the flue gas, thereby reducing the resistance of the flue gas inside the device. After the sieve plate is reversed, the limit assembly is reset to ensure the stability of the sieve plate after flipping. In order to ensure the stability of the unit operation during the flipping process, the sieve plate flipping operation can be performed under low boiler load.

[0030] Example 2

[0031] like Figure 4 As shown, the only difference between this embodiment and Example 1 is that auxiliary limiting holes (not shown in the figure) are symmetrically provided at the front and rear ends of the sieve plate, and second telescopic rods 19 are symmetrically provided on the front and rear side walls of the tower body. The telescopic ends of the second telescopic rods slide through the side walls of the tower body and can be disconnected from the auxiliary limiting holes. The provision of the auxiliary limiting holes and the second telescopic rod can further improve the stability of the sieve plate during normal operation. When the sieve plate needs to be flipped, the second telescopic rod can be controlled to retract synchronously with the first telescopic rod. After the sieve plate is flipped into place, the second telescopic rod is reset to achieve auxiliary limiting of the sieve plate.

[0032] Specifically, the second telescopic rods are all electric telescopic rods.

[0033] While the embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not 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 boiler flue gas desulfurization tower, comprising a cylindrical tower body, a spray layer, a packing layer, a demister, and a sieve plate, wherein an air inlet pipe is connected to the lower side of the tower body, an exhaust pipe is provided at the top, and a liquid collecting tank is provided at the bottom of the tower body, the exhaust pipe is provided above the liquid collecting tank, the sieve plate is provided above the exhaust pipe, the demister is provided below the exhaust pipe, the spray layer and the packing layer are provided between the sieve plate and the demister, and characterized in that: The sieve plate is disc-shaped, and the left and right ends of the sieve plate are rotatably connected to the tower body through rotating shafts respectively. The rotating shafts are sealed with the tower body. One of the rotating shafts passes through the tower body and is connected to a driving device, and the other rotating shaft passes through the tower body and can be detached from the limited position component. The outer periphery of the sieve plate is provided with a sealing component that is in sliding contact with the inner wall of the tower body. After the limiting component is detached from the corresponding rotating shaft, the driving device can drive the sieve plate to flip 180 degrees.

2. A boiler flue gas desulfurization tower according to claim 1, characterized in that: The driving device adopts a servo motor, and the output shaft of the servo motor is transmission-connected to the rotating shaft at the corresponding end through a coupling.

3. A boiler flue gas desulfurization tower according to claim 1, characterized in that: The limiting assembly includes a first telescopic rod, which is connected to the side wall of the tower body through a limiting support, and the telescopic end of the first telescopic rod is a rectangular structure. The rotating shaft at the corresponding end of the limiting assembly is provided with a rectangular plug interface that matches the telescopic end of the first telescopic rod.

4. A boiler flue gas desulfurization tower according to claim 3, characterized in that: The sealing assembly includes an upper annular groove and a lower annular groove symmetrically arranged on the side wall of the sieve plate. An annular corrosion-resistant airbag is provided in the upper annular groove and the lower annular groove. The annular corrosion-resistant airbag is provided with an inflation port, and an embedded sealing plug is provided at the inflation port.

5. A boiler flue gas desulfurization tower according to claim 4, characterized in that: The rotating shaft is arranged between the upper ring groove and the lower ring groove, and auxiliary limiting holes are symmetrically provided at the front and rear ends of the sieve plate. Second telescopic rods are symmetrically provided on the front and rear side walls of the tower body. The telescopic ends of the second telescopic rods slide through the side walls of the tower body and can be disconnected from the auxiliary limiting holes.

6. A boiler flue gas desulfurization tower according to claim 5, characterized in that: The first telescopic rod and the second telescopic rod are both electric telescopic rods or pneumatic telescopic rods.

7. A boiler flue gas desulfurization tower according to claim 6, characterized in that: The spray layer and the filler layer are respectively provided with two layers, and a spray layer is correspondingly provided above each filler layer.

8. A boiler flue gas desulfurization tower according to claim 7, characterized in that: The spray layer includes a spray grid tube and atomizing nozzles evenly distributed at the bottom of the spray grid tube. The liquid inlet of the spray grid tube is connected to a spray liquid main pipe, and the spray liquid main pipe is connected to an external spray liquid supply pipe.

9. The boiler flue gas desulfurization tower according to claim 8, characterized in that: A side-entry stirrer is provided in the liquid collecting tank, and a liquid discharge port is provided at the bottom side of the liquid collecting tank, and a pH detector is provided at the liquid discharge port.

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