Boiler combustion stabilizing device

Abstract

The utility model relates to the technical field of boiler combustion stabilizing devices, and discloses a boiler combustion stabilizing device which comprises an outer pipe and an inner pipe, the outer portion of the inner pipe is assembled in an inner cavity of the outer pipe through a bearing, the upper end and the lower end of the outer pipe are communicated with an air inlet and outlet pipe, and a motor is assembled outside the outer pipe. The output end of the motor is connected with a first conical tooth, and the outer portion of the first conical tooth is connected with a second conical tooth in an engaged mode. According to the boiler combustion stabilizing device, accurate temperature control is achieved through continuous flowing of water vapor or boiling water, the local overheating phenomenon is avoided, meanwhile, maximization of the heat exchange area is guaranteed through the structural design that the heating groove extends in the axial direction of the inner pipe, and after external gas enters the inner pipe through the gas inlet and outlet pipe at the bottom of the outer pipe, a spiral ascending flow field is formed in the inner pipe; the gas retention time is obviously prolonged, the temperature uniformity is improved, stable rotating movement of the inner pipe is achieved, and the dynamic heat exchange process of gas in an inner cavity of the inner pipe and a heat medium in the heating groove is effectively promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler combustion stability devices, and specifically relates to a boiler combustion stability device. Background Art

[0002] In the technical field of boiler equipment, the stability of the combustion process and the thermal efficiency have always been the core optimization directions. Most traditional boiler combustion devices use a fixed pipeline structure for gas transportation and heat exchange. The internal cavity air flow organization method and the heat medium conduction path often have design limitations, resulting in the combustion conditions being easily affected by fuel characteristics, load fluctuations, and environmental conditions. Especially in the working conditions that require rapid adjustment or maintaining a constant temperature output, problems such as uneven temperature distribution and excessive harmful gas emissions are likely to occur.

[0003] The structural designs of existing similar devices usually have the following deficiencies: The inner pipe and the outer pipe mostly use a rigid connection method and cannot achieve relative rotational motion, resulting in it being difficult to form an effective dynamic heat exchange between the internal cavity gas and the heat medium; The air flow guiding structure is single and lacks a periodic disturbance mechanism, causing the gas boundary layer to continuously thicken and reducing the mixing efficiency. At the same time, the gas flow field mostly has a straight motion trajectory, resulting in a relatively short residence time in the pipeline and a large axial temperature gradient; The heat medium circulation system often uses an open or semi-closed design, making it difficult to accurately control the medium flow rate and temperature distribution, and easily causing local overheating or insufficient heat exchange; In addition, the mechanical transmission components of traditional devices lack coordinated optimization with fluid dynamics characteristics, and there is room for improvement in combustion stability and emission control capabilities when dealing with fuel calorific value fluctuations or load mutations. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a boiler combustion stability device to solve the technical problems that the heat medium circulation system often uses an open or semi-closed design, making it difficult to accurately control the medium flow rate and temperature distribution, and easily causing local overheating or insufficient heat exchange.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A boiler combustion stability device, comprising: an outer pipe and an inner pipe. The outer of the inner pipe is assembled in the inner cavity of the outer pipe through a bearing. Both the upper and lower ends of the outer pipe are connected with intake and exhaust pipes. An electric motor is assembled on the outer of the outer pipe. The output end of the electric motor is connected with a first bevel gear. The outer of the first bevel gear is meshed and connected with a second bevel gear. The second bevel gear is sleeved on the outer of the inner pipe. The inner cavity of the inner pipe is evenly provided with spoiler plates. Both the upper and lower ends of the inner pipe are inserted with intake and exhaust short pipes. Both the left and right sides of the inner pipe are connected with intake and drain pipes. Heating grooves are opened on the inner wall of the inner pipe, and the heating grooves are communicated with the intake and drain pipes.

[0006] Preferably, a motor bracket is fixed to the outer wall of the outer pipe by bolts. The motor bracket is an L-shaped sheet metal structure and its surface is sprayed with a heat-insulating ceramic coating. A servo motor is locked to the motor bracket by bolts. The output shaft of the motor penetrates through the pipe wall of the outer pipe and forms a rotational support through an angular contact ball bearing. The bearing adopts a double-row configuration structure, and the bearing seat is welded and fixed to the pipe wall of the outer pipe. A double-lip skeleton oil seal is provided between the inner and outer rings of the bearing to form a dynamic seal. The end of the motor output shaft is connected with a first bevel gear, and the first bevel gear meshes with a second bevel gear sleeved on the outer wall of the inner pipe to form a meshing drive. The second bevel gear is circumferentially positioned with the keyway on the outer wall of the inner pipe through a flat key, and the meshing tooth surfaces are coated with a solid lubricant.

[0007] Preferably, an outer connecting pipe is welded to the top of the intake and exhaust pipe. The outer connecting pipe is made of 304 stainless steel of the same material as the intake and exhaust pipe, and a flange is provided at its pipe end. The connection between the outer connecting pipe and the intake and exhaust pipe is welded by argon arc welding, and the weld seam is qualified after X-ray flaw detection.

[0008] Preferably, a double-lip seal bearing is assembled at the junction of the intake and drain pipe and the outer pipe. The inner ring of the seal bearing is in interference fit with the intake and drain pipe, and the outer ring is in clearance fit with the pipe wall of the outer pipe. A flange with a limit step is welded to the outside of the intake and drain pipe, and the surface of the flange is provided with an anti-corrosion coating made of 316L stainless steel.

[0009] Preferably, the intake and exhaust short pipe includes a circular groove, which is opened outside the inner pipe, and a diversion pipe is embedded in the inner cavity of the circular groove.

[0010] Preferably, there are at least two groups of intake and exhaust pipes, which are staggered and arranged at the upper and lower ends of the outer pipe, and the intake and exhaust pipes facilitate the intake and exhaust of gas or fluid.

[0011] Compared with the prior art, the utility model provides a boiler combustion stability device, which has the following beneficial effects:

[0012] The boiler combustion stabilization device has an outer tube and an inner tube that form a rotatable connection structure through a bearing, so that the inner tube can rotate independently in the inner cavity of the outer tube, and cooperate with an externally mounted motor to drive the first conical teeth and the second conical teeth to engage and transmit, so as to realize the stable rotation movement of the inner tube, and effectively promote the dynamic heat exchange process between the gas in the inner cavity of the inner tube and the heat medium in the heating tank; the spoilers evenly arranged on the inner wall of the inner tube generate periodic disturbances to the airflow during the rotation process, destroy the boundary layer and enhance the gas mixing effect, and cooperate with the inlet and exhaust short pipes plugged at the upper and lower ends to form a convection channel, so that the external gas enters through the inlet and exhaust pipes at the bottom of the outer tube, and enters the inner tube A spiral upward flow field is formed inside, which significantly prolongs the gas residence time and improves temperature uniformity. The inlet and outlet pipes connected to the heating tank on the left and right sides form a closed-loop heat medium circulation system, which achieves precise temperature control through the continuous flow of water vapor or boiling water to avoid local overheating. At the same time, the structural design of the heating tank extending along the axial direction of the inner tube ensures that the heat exchange area is maximized. Through the synergistic effect of mechanical transmission and fluid dynamics, the device reduces the fluctuation range of the boiler inlet temperature, improves the stability of the combustion conditions, and can adapt to different fuel characteristics and load changes. Requirements, while ensuring combustion efficiency and reducing harmful gas emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front schematic diagram of the utility model;

[0014] Figure 2 It is the external schematic diagram of the utility model;

[0015] Figure 3 It is a plan view of the utility model;

[0016] Figure 4 It is a partial cross-sectional view of the inner tube of the utility model.

[0017] In the figure: 1, outer tube; 2, inlet and exhaust pipes; 21, external tube; 3, motor; 31, motor frame; 32, first conical teeth; 4, inner tube; 41, second conical teeth; 42, inlet and exhaust short pipes; 43, spoiler; 44, heating tank; 45, inlet and outlet pipes; 46, sealed bearing. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] The utility model provides a technical solution, please refer to Figure 1 and Figure 2, a boiler combustion stability device, comprising an outer tube 1 and an inner tube 4 arranged coaxially. The outside of the inner tube 4 is assembled on the inner wall surface of the inner cavity of the outer tube 1 through two groups of deep groove ball bearings to form a rotatable sealing structure. The outer tube 1 is made of 304 stainless steel. Both the upper and lower ends of the outer tube 1 are welded with intake and exhaust pipes 2, and the diameter of the intake and exhaust pipes 2 is DN80.

[0020] A motor 3 is fixed to the outside of the outer tube 1 by bolts. The output end of the motor 3 is connected with a first bevel gear 32 through a flat key. The motor 3 is an explosion-proof three-phase asynchronous motor, and its protection level reaches IP65. The surface of the output shaft is chrome-plated to enhance wear resistance. The module of the first bevel gear 32 is 2.5, and its outside is meshed and connected with a second bevel gear 41 with the same module. The second bevel gear 41 is sleeved on the outside of the inner tube 4 through interference fit to form a transmission mechanism.

[0021] Please refer to Figure 3 and Figure 4 , the inner tube 4 is made of Inconel 625 alloy, and 12 groups of spoiler plates 43 are evenly arranged along the axial direction in its inner cavity. Each group of spoiler plates 43 is composed of 3 arc-shaped blades distributed at 120°. The blades are welded at an angle of 30° with the axis, and the surface is coated with a high-temperature resistant ceramic coating. Both the upper and lower ends of the inner tube 4 are inserted with intake and exhaust short pipes 42. The intake and exhaust short pipes 42 include circular grooves opened on the tube wall of the inner tube 4. A ceramic material guide pipe is embedded in the inner cavity of the circular groove, and the end of the guide pipe is provided with a 45° chamfer structure.

[0022] Intake and drain pipes 45 are symmetrically welded on the left and right sides of the inner tube 4. The intake and drain pipes 45 are connected to the external circulating water system by means of flange connection. A double O-ring sealing structure is provided at the connection between the intake and drain pipes 45 and the inner tube 4, and the outer surface of the pipe body is coated with a 50mm thick rock wool insulation layer. A spiral heating groove 44 is opened on the inner wall of the inner tube 4. The depth of the heating groove 44 is 3mm and the pitch is 50mm. It forms a closed water circulation channel with the intake and drain pipes 45 by welding.

[0023] A motor bracket 31 is fixed to the outer wall of the outer tube 1 by bolts. The motor bracket 31 is an L-shaped sheet metal structure and its surface is sprayed with a heat-insulating ceramic coating. A servo motor 3 is locked to the motor bracket 31 by bolts. The output shaft of the motor 3 penetrates through the tube wall of the outer tube 1 and forms a rotating support through angular contact ball bearings. The bearings are arranged in a double-row configuration structure. The bearing seat is welded and fixed to the tube wall of the outer tube 1. A double-lip skeleton oil seal is provided between the inner and outer rings of the bearings to form a dynamic seal. The end of the output shaft of the motor 3 is connected with a first bevel gear 32. The first bevel gear 32 and a second bevel gear 41 sleeved on the outer wall of the inner tube 4 form a meshing transmission. The second bevel gear 41 is circumferentially positioned through a flat key and the key groove on the outer wall of the inner tube 4, and the meshing tooth surfaces are coated with solid lubricant.

[0024] The top of the intake and exhaust pipe 2 is welded with an external connecting pipe 21. The external connecting pipe 21 is made of 304 stainless steel with the same material as the intake and exhaust pipe 2, and a flange is provided at its pipe end. The connection between the external connecting pipe 21 and the intake and exhaust pipe 2 is welded by argon arc welding, and the weld seam is qualified after X-ray flaw detection.

[0025] A double-lip seal bearing 46 is assembled at the junction of the intake and drain pipe 45 and the outer pipe 1. The inner ring of the seal bearing 46 is in interference fit with the intake and drain pipe 45, and the outer ring is in clearance fit with the wall of the outer pipe 1. A flange with a limit step is welded to the outside of the intake and drain pipe 45, and an anti-corrosion coating made of 316L stainless steel is provided on the surface of the flange.

[0026] The intake and exhaust short pipe 42 includes a circular groove. The circular groove is opened outside the inner pipe 4, and a diversion pipe is embedded in the inner cavity of the circular groove.

[0027] There are at least two groups of intake and exhaust pipes 2, which are staggered at the upper and lower ends of the outer pipe 1. The intake and exhaust pipes 2 facilitate the intake and exhaust of gas or fluid.

[0028] In this solution, boiling water or steam is connected to the intake and drain pipe 45 through a water pump, and then discharged into the inner cavity of the heating tank 44 for flow. The external gas is connected to the intake and exhaust pipe 2 at the bottom of the outer pipe 1, discharged into the inside of the inner pipe 4 through the intake and exhaust short pipe 42, and then discharged through the intake and exhaust short pipe 42 and the intake and exhaust pipe 2 at the top of the inner pipe 4, and introduced into the inner cavity of the boiler to stabilize the combustion operation in the inner cavity of the boiler.

[0029] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0030] Although the embodiments of the present invention 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 invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A boiler combustion stability device, comprising: An outer tube (1) and an inner tube (4), the exterior of the inner tube (4) is assembled in the inner cavity of the outer tube (1) through bearings, and it is characterized in that: both the upper and lower ends of the outer tube (1) are communicated with an intake and exhaust pipe (2), a motor (3) is assembled on the exterior of the outer tube (1), the output end of the motor (3) is connected with a first bevel gear (32), the exterior of the first bevel gear (32) is meshed and connected with a second bevel gear (41), the second bevel gear (41) is sleeved on the exterior of the inner tube (4), the inner cavity of the inner tube (4) is evenly provided with spoiler plates (43), intake and exhaust short pipes (42) are inserted at both the upper and lower ends of the inner tube (4), water inlet and outlet pipes (45) are communicated on both the left and right sides of the inner tube (4), a heating groove (44) is formed on the inner wall of the inner tube (4), and the heating groove (44) is communicated with the water inlet and outlet pipes (45).

2. A boiler combustion stability device according to claim 1, characterized in that: A motor bracket (31) is assembled on the exterior of the motor (3), the motor bracket (31) is connected with the outer tube (1), and a bearing is assembled at the junction of the output end of the motor (3) and the outer tube (1).

3. The boiler combustion stability device according to claim 1, characterized in that: An outer connection pipe (21) is communicated at the top of the intake and exhaust pipe (2), and a flange is assembled on the exterior of the outer connection pipe (21).

4. A boiler combustion stability device according to claim 1, characterized in that: A sealed bearing (46) is assembled at the junction of the water inlet and outlet pipe (45) and the outer tube (1), and a flange is assembled on the exterior of the water inlet and outlet pipe (45).

5. A boiler combustion stability device according to claim 1, characterized in that: The intake and exhaust short pipe (42) includes a circular groove formed on the exterior of the inner tube (4), and a diversion pipe is embedded in the inner cavity of the circular groove.

6. The boiler combustion stability device according to claim 1, characterized in that: There are at least two groups of the intake and exhaust pipes (2), and they are staggeredly arranged at the upper and lower ends of the outer tube (1).

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