Hot air unblocking device for air pre-heater

Abstract

The utility model discloses a hot air unblocking device of an air pre-heater, which relates to the technical field of air pre-heaters, and comprises an air pre-heater body, a primary air duct, a secondary air duct and a flue gas duct are arranged in the air pre-heater body, an unblocking mechanism is arranged in the secondary air duct, and the flue gas duct is arranged in the air pre-heater body. The blockage removing mechanism comprises a base fixedly installed on the inner wall of the secondary air duct, a rotating seat is rotationally installed in the base, a steam spraying pipe is installed on the top of the rotating seat, a plurality of evenly-distributed spraying heads are arranged on the steam spraying pipe, and a connecting pipe is installed at the bottom of the steam spraying pipe in a communicating mode. A support is fixedly installed on one side of the top of the base, and a cleaning roller making contact with the steam spraying pipe is rotationally installed at one end of the support. Steam can be uniformly conveyed into the secondary air duct through an external high-temperature steam source, a blocked part is rapidly heated, ammonium hydrogen sulfate is gasified, and blockage clearing operation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air preheaters, in particular to a hot air blockage cleaning device for an air preheater. Background Art

[0002] An air preheater is a heating surface in the flue gas duct at the tail of a boiler, where the flue gas in the duct preheats the air entering the boiler to a certain temperature through internal fins. It is a device used to improve the heat exchange performance of the boiler and reduce energy consumption. Currently, in order to reduce the emission of nitrogen oxides, a catalytic reduction device is usually installed in a boiler unit. Under the action of the catalyst, the conversion of SO2 to SO3 in the flue gas increases. SO3 combines with ammonia to form ammonium bisulfate, which deposits on the air preheater, causing ash blockage of the air preheater, resulting in an increase in the pressure difference in the air duct, an increase in the power consumption of the fan, and in severe cases, causing induced draft stall, affecting the load-carrying capacity of the unit. Therefore, it is necessary to invent a hot air blockage cleaning device for an air preheater. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a hot air blockage cleaning device for an air preheater, which solves the technical problems put forward in the above background art.

[0004] To solve the above technical problems, the utility model provides the following technical solutions: A hot air blockage cleaning device for an air preheater includes an air preheater body. Inside the air preheater body, a primary air duct, a secondary air duct, and a flue gas duct are installed. A blockage cleaning mechanism is arranged inside the secondary air duct. The blockage cleaning mechanism includes a base fixedly installed on the inner wall of the secondary air duct. A rotating seat is rotatably installed inside the base. A steam spray pipe is installed on the top of the rotating seat. A plurality of uniformly distributed nozzles are arranged on the steam spray pipe. A connecting pipe is connected and installed at the bottom of the steam spray pipe. A support is fixedly installed on one side of the top of the base. One end of the support is rotatably installed with a cleaning roller in contact with the steam spray pipe.

[0005] Further, the steam spray pipe is arranged in a circumferentially continuous and radially decreasing tree structure.

[0006] Further, a driving member for driving the steam spray pipe and the cleaning roller to rotate reciprocally is arranged on the support. The driving member includes a servo motor fixedly installed on the inner bottom wall of the base. The output end of the servo motor passes through the base and is fixedly connected to the center of the rotating seat.

[0007] Further, a driving gear is also fixedly sleeved on the output end of the servo motor. A sliding rod is rotatably installed inside the support. The lower end of the sliding rod passes through and is fixedly connected with a driven gear. The driven gear meshes with the driving gear. A bevel gear one is fixedly connected to the upper end of the sliding rod. A bevel gear two meshing with the bevel gear one is fixedly sleeved on the lower end of the cleaning roller.

[0008] Furthermore, a sonic generator is installed on the inner wall of the flue gas duct.

[0009] Furthermore, hot air pipes are provided on both the primary air duct and the secondary air duct.

[0010] By means of the above technical solution, the present utility model provides a hot air clogging removal device for an air preheater, which has at least the following beneficial effects:

[0011] 1. By arranging the steam spray pipe and setting the steam spray pipe into a tree-shaped structure with continuous circumferential and decreasing radial directions, the present utility model can evenly transport steam into the secondary air duct through an external high-temperature steam source, quickly heat the clogged part, vaporize ammonium bisulfate, and achieve the clogging removal operation.

[0012] 2. By arranging the cleaning roller, the present utility model can drive the steam spray pipe and the cleaning roller to rotate reciprocally through the driving member, realize the comprehensive cleaning of the nozzle, avoid the nozzle from being clogged, and ensure the normal transportation of steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments and descriptions thereof of the present application are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0014] Figure 1 is the overall structural schematic diagram of the present utility model;

[0015] Figure 2 is the structural schematic diagram of the clogging removal mechanism of the present utility model;

[0016] Figure 3 is the internal structural schematic diagram of the outer support of the present utility model;

[0017] Figure 4 is the structural schematic diagram of the driving member of the present utility model.

[0018] In the figure: 1. Air preheater body; 2. Primary air duct; 3. Secondary air duct; 4. Flue gas duct; 5. Hot air pipe; 6. Sonic generator; 7. Clogging removal mechanism; 71. Base; 72. Steam spray pipe; 73. Connecting pipe; 74. Rotating seat; 75. Nozzle; 76. Bracket; 77. Cleaning roller; 78. Driving member; 781. Servo motor; 782. Driving gear; 783. Slide bar; 784. Driven gear; 785. Bevel gear 1; 786. Bevel gear 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the protection scope of the present utility model.

[0020] When the existing air preheater is in use, a catalytic reduction device is usually installed in the boiler unit. Under the action of the catalyst, the conversion of SO2 to SO3 in the flue gas will increase. SO3 combines with ammonia to form ammonium bisulfate, which deposits on the air preheater, causing ash blockage of the air preheater, resulting in an increase in the pressure difference in the air duct, an increase in the power consumption of the fan, and in severe cases, causing induced draft stall, affecting the load-carrying capacity of the unit. Therefore, it is necessary to invent a hot air cleaning and blockage removal device for the air preheater.

[0021] To solve the defects existing in the above air preheater during use, please refer to Figures 1 - 4, a hot air blockage clearing device provided by the utility model can achieve the purpose of gasifying ammonium bisulfate and removing blockages through a high-temperature steam source. The blockage clearing device is based on an air preheater body 1. Inside the air preheater body 1, a primary air duct 2, a secondary air duct 3, and a flue gas duct 4 are installed. Hot air pipes 5 are provided on both the primary air duct 2 and the secondary air duct 3. The primary air duct 2 is connected to the secondary air duct 3 through the hot air pipe 5, and the secondary air duct 3 is connected to the flue gas duct 4 through the hot air pipe 5. The hot air taken from the primary air duct 2 is led out and sent into the sealing compartment at the cold end of the secondary air duct 3 through the hot air pipe 5. After heating the heat storage elements at the cold end of the air preheater, it enters the secondary air duct 3. The hot air taken from the secondary air duct 3 is led out and sent into the sealing compartment at the cold end of the flue gas duct 4 through the hot air pipe 5. After heating the heat storage elements at the cold end of the air preheater body 1, it enters the flue. Among them, the cold storage elements and the sealing compartments are both prior arts. In order to prevent ammonium bisulfate generated by the flue gas from depositing on the heat storage elements at the cold end of the air preheater body 1, a blockage clearing mechanism 7 is provided inside the secondary air duct 3. There is a base 71 fixedly installed on the inner wall of the secondary air duct 3. A rotating seat 74 is rotatably installed inside the base 71. A steam spray pipe 72 is installed on the top of the rotating seat 74. A plurality of evenly distributed nozzles 75 are provided on the steam spray pipe 72. A connecting pipe 73 is connected and installed at the bottom of the steam spray pipe 72. The outside of the connecting pipe 73 is connected to a high-temperature steam source (not shown in the figure). The steam is introduced into the cold end of the secondary air duct 3 through the connecting pipe 73 and the steam spray pipe 72, which can quickly heat the blocked part, gasify ammonium bisulfate, and achieve the blockage clearing operation. On one side of the top of the base 71, a bracket 76 is provided. One end of the bracket 76 is rotatably installed with a cleaning roller 77 in contact with the steam spray pipe 72, and a driving member 78 for driving the cleaning roller 77 to rotate is provided on the bracket 76. The cleaning roller 77 is used to clean the nozzles 75 on the steam spray pipe 72 to prevent the nozzles 75 from being blocked and ensure the normal spraying of steam.

[0022] In order to optimize the spraying effect of the steam spray pipe 72 on the steam, the steam spray pipe 72 is set into a tree-shaped structure with continuous circumferential direction and decreasing radially, which can ensure the uniform distribution of steam in the entire annular area and improve the gasification efficiency.

[0023] In order to achieve a comprehensive cleaning of the nozzle 75 by the cleaning roller 77, a driving member 78 for driving the steam nozzle 72 and the cleaning roller 77 to rotate reciprocally is provided on the bracket 76. Since the bottom of the steam nozzle 72 is also connected with a connecting pipe 73, and the steam nozzle 72 needs to rotate reciprocally to avoid affecting the connecting pipe 73, the driving member 78 is set as a servo motor 781 fixedly installed on the inner bottom wall of the base 71. The output end of the servo motor 781 passes through the base 71 and is fixedly connected to the center of the rotating seat 74. Moreover, the output end of the servo motor 781 is also fixedly sleeved with a driving gear 782. A sliding rod 783 is rotatably installed inside the bracket 76. The lower end of the sliding rod 783 passes through and is fixedly connected with a driven gear 784. The driven gear 784 meshes with the driving gear 782. Driving the servo motor 781 drives the driving gear 782 and the rotating seat 74 to rotate reciprocally. The rotation of the rotating seat 74 drives the steam nozzle 72 to rotate reciprocally. The connecting pipe 73 is a telescopic pipe that can adapt to the rotation of the steam nozzle 72. The rotation of the driving gear 782 drives the rotation of the driven gear 784 through the meshing. The rotation of the driven gear 784 drives the rotation of the sliding rod 783. The upper end of the sliding rod 783 is fixedly connected with a first bevel gear 785. The lower end of the cleaning roller 77 is fixedly sleeved with a second bevel gear 786 that meshes with the first bevel gear 785. The rotation of the sliding rod 783 drives the rotation of the second bevel gear 786 through the first bevel gear 785. The rotation of the second bevel gear 786 drives the cleaning roller 77 to rotate reciprocally. The left and right rotation of the cleaning roller 77 can clean the nozzles 75 on the steam nozzle 72. The reciprocal rotation of the steam nozzle 72 enables the cleaning roller 77 to be in full contact with the nozzles 75 on the steam nozzle 72, thereby achieving a comprehensive cleaning of the nozzles 75 and preventing the nozzles 75 from being blocked.

[0024] Since the flue gas will carry dust particles and may adhere to the inner wall of the flue gas duct 4 when passing through the flue gas duct 4, therefore, a sound wave generator 6 is installed on the inner wall of the flue gas duct 4. Regularly driving the sound wave generator 6 can shake off the dust accumulated on the inner wall of the flue gas duct 4 and ensure the flow effect of the flue gas duct 4.

[0025] The control method of the present utility model is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming by those skilled in the art. The provision of the power supply also belongs to the common knowledge in the art. And the present utility model is mainly used to protect mechanical devices, so the control method and circuit connection of the present utility model will not be explained in detail.

[0026] It should be noted that the term "comprises", "comprising", or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements but also other elements that are not explicitly listed, or elements that are inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An air preheater hot air blockage clearing device, comprising an air preheater body (1), characterized in that: Inside the air preheater body (1), a primary air duct (2), a secondary air duct (3) and a flue gas duct (4) are installed. A clogging clearing mechanism (7) is arranged inside the secondary air duct (3). The clogging clearing mechanism (7) includes a base (71) fixedly installed on the inner wall of the secondary air duct (3). A rotating seat (74) is rotatably installed inside the base (71). A steam spray pipe (72) is installed on the top of the rotating seat (74). A plurality of uniformly distributed nozzles (75) are arranged on the steam spray pipe (72). A connecting pipe (73) is connected and installed at the bottom of the steam spray pipe (72). A support (76) is fixedly installed on one side of the top of the base (71). One end of the support (76) is rotatably installed with a cleaning roller (77) in contact with the steam spray pipe (72).

2. The hot air blockage clearing device for the air preheater according to claim 1, wherein: The steam spray pipe (72) is arranged in a tree-shaped structure with circumferential continuity and radial decrease.

3. The hot air blockage clearing device for the air preheater according to claim 1, wherein: A driving member (78) for driving the steam spray pipe (72) and the cleaning roller (77) to rotate reciprocally is arranged on the support (76). The driving member (78) includes a servo motor (781) fixedly installed on the inner bottom wall of the base (71). The output end of the servo motor (781) passes through the base (71) and is fixedly connected to the center of the rotating seat (74).

4. The hot air blockage clearing device for the air preheater according to claim 3, wherein: A driving gear (782) is also fixedly sleeved on the output end of the servo motor (781). A slide bar (783) is rotatably installed inside the support (76). The lower end of the slide bar (783) passes through and is fixedly connected with a driven gear (784). The driven gear (784) meshes with the driving gear (782). A first bevel gear (785) is fixedly connected to the upper end of the slide bar (783). A second bevel gear (786) meshing with the first bevel gear (785) is fixedly sleeved on the lower end of the cleaning roller (77).

5. The air preheater hot air blockage clearing device according to claim 1, wherein: An acoustic wave generator (6) is installed on the inner wall of the flue gas duct (4).

6. The hot air blockage clearing device for the air preheater according to claim 1, wherein: Hot air pipes (5) are arranged on both the primary air duct (2) and the secondary air duct (3).

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