Boiler flue connection structure with self-regulating ventilation volume

Abstract

This utility model relates to the field of boiler technology, specifically a boiler flue connection structure with self-adjusting ventilation volume. It includes a boiler flue pipe with a first pressure sensor installed on its inner wall. The boiler flue pipe is connected to a flue pipe via a self-adjusting ventilation assembly. The flue pipe has a second pressure sensor, a temperature sensor, and a flow sensor installed on its inner wall. The self-adjusting ventilation assembly includes a rectangular housing with a rectangular movable plate fitted inside. A vertical slot for the movable plate to pass through is provided on the rear side of the rectangular housing. A connecting plate is provided on the rear side of the movable plate. L-shaped mounting seats are provided on both the upper and lower sides of the rectangular housing, and electric cylinders are installed on both L-shaped mounting seats. The movable rods of both electric cylinders are fixedly connected to the front side of the connecting plate. This self-adjusting ventilation volume boiler flue connection structure dynamically adjusts the flue cross-sectional area through the rectangular movable plate, enabling real-time response to boiler load changes and solving the problem of non-adjustable ventilation volume in traditional fixed flue systems.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, specifically to a boiler flue connection structure with self-regulating ventilation volume. Background Technology

[0002] A boiler is a device that heats water to produce steam or hot water by burning fuel or utilizing other heat sources. It is widely used in various fields such as industry, building heating, and power generation. The efficiency and safety of a boiler directly affect the overall system's performance. To ensure the boiler operates safely and stably under high temperature and high pressure conditions, the exhaust gases generated within the boiler must be discharged through a flue. As a crucial component of the boiler, the flue plays a vital role in improving boiler operating efficiency and reducing environmental pollution.

[0003] Boiler flues are crucial channels connecting boilers to the atmosphere or waste gas treatment systems. Their primary function is to effectively discharge combustion gases and maintain negative pressure within the boiler, thereby ensuring smooth combustion. The design and connection structure of boiler flues directly affect the resistance to flue gas flow, heat loss, and emission safety.

[0004] Existing boiler flue connection structures are typically fixed designs, lacking flexibility and adaptability. This fixed design means that the flue's ventilation volume cannot be adjusted in time when the boiler load changes, potentially causing problems such as poor flue gas flow and incomplete emissions. Furthermore, fixed ventilation settings may lead to reduced boiler efficiency, increased energy consumption, and potential safety hazards, such as flue gas backflow. Therefore, we propose a boiler flue connection structure with self-adjusting ventilation volume. Utility Model Content

[0005] The purpose of this invention is to provide a boiler flue connection structure with self-adjusting ventilation volume to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] The boiler flue connection structure with self-regulating ventilation volume includes a boiler flue pipe. The inner wall of the boiler flue pipe is equipped with a first pressure sensor for real-time monitoring of the boiler furnace pressure and feeding it back to the controller via an electrical signal. The boiler flue pipe is connected to a flue pipe through a self-regulating ventilation component. The inner wall of the flue pipe is equipped with a second pressure sensor, a temperature sensor, and a flow sensor for continuously collecting pressure, flue gas temperature, and flow rate data in the flue pipe, and transmitting them to the controller via wires for dynamic analysis.

[0008] The self-regulating ventilation assembly includes a rectangular shell. The boiler flue and the flue gas duct are both connected to the rectangular shell, which serves as a flue gas flow channel. A rectangular movable plate is fitted inside the rectangular shell. The movable plate changes the cross-sectional area of ​​the flue by moving horizontally back and forth, thereby adjusting the ventilation volume. A strip-shaped vertical opening is provided on the rear side of the rectangular shell for the movable plate to pass through. A connecting plate is provided on the rear side of the movable plate, which serves as a rigid connection between the electric cylinder and the movable plate, transmitting the linear motion of the electric cylinder to the movable plate. L-shaped mounting seats are provided on the upper and lower sides of the rectangular shell. The L-shaped mounting seats are fixed to the outer wall of the rectangular shell by bolts, providing a stable mounting base for the electric cylinder. An electric cylinder is provided on each of the two L-shaped mounting seats. The electric cylinder has a stroke accuracy of ±0.1mm and a response time of 50ms, and can precisely drive the movable plate to move horizontally back and forth according to the controller command. The movable rods of the two electric cylinders are fixedly connected to the front side of the connecting plate. An anti-backflow valve is provided inside the flue gas duct near the flue gas outlet to prevent external airflow from flowing back.

[0009] Preferably, the flue gas outlet end of the boiler flue is detachably connected to the left side of the rectangular shell by bolts, and the flue gas inlet end of the flue gas guide pipe is detachably connected to the right side of the rectangular shell by bolts. The bolts are M12 high-strength stainless steel bolts with a preload of 80 N.m to ensure airtightness and shock resistance of the connection.

[0010] Preferably, the rectangular movable plate is provided with high-temperature resistant sealing rubber on both the left and right sides. The high-temperature resistant sealing rubber is made of silicone rubber and has a temperature resistance range of -50℃ to 300℃, so as to achieve dynamic sealing when the rectangular movable plate moves back and forth. The opposite sides of the two high-temperature resistant sealing rubbers are tightly fitted to the left and right sides of the inner wall of the rectangular shell to ensure that there is no leakage of flue gas.

[0011] Preferably, the inner wall of the strip-shaped vertical opening is bonded with a frame-shaped sealing rubber. The frame-shaped sealing rubber is made of fluororubber and has a temperature tolerance range of -20℃ to 250℃. It is interference-fitted with the outer side of the rectangular movable plate to form a sealing barrier. The inner wall of the frame-shaped sealing rubber is tightly fitted with the outer side of the rectangular movable plate to prevent flue gas from overflowing through the strip-shaped vertical opening.

[0012] Preferably, the first pressure sensor is located near the inlet end of the boiler flue pipe and is used to monitor the boiler furnace pressure. Its range is -10kPa to +10kPa and its accuracy class is 0.5. The real-time data is transmitted to the controller via a 4-20mA current signal.

[0013] Preferably, the second pressure sensor, temperature sensor, and flow sensor are all located near the smoke inlet end of the flue gas duct, and are used to monitor the pressure, flue gas temperature, and flue gas velocity in the flue gas duct, respectively. The second pressure sensor has a range of -5 kPa to +5 kPa and is used to monitor pressure fluctuations in the flue gas duct. The temperature sensor is a type K thermocouple with a measurement range of 0°C to 600°C and is used to detect the flue gas temperature. The flow sensor is a thermal mass flow meter with a measurement accuracy of ±1%FS and is used to provide real-time feedback on the flue gas velocity.

[0014] Preferably, a controller is provided on the right side of the rectangular housing. The electric cylinder, the first pressure sensor, the second pressure sensor, the temperature sensor, and the flow sensor are electrically connected to the controller via wires. The controller has a built-in control algorithm that calculates the target position of the electric cylinder and outputs a control signal based on the feedback signals from the first pressure sensor, the second pressure sensor, the temperature sensor, and the flow sensor.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This self-regulating flue gas connection structure dynamically adjusts the cross-sectional area of ​​the flue gas through a rectangular movable plate, which can respond to changes in boiler load in real time, solve the problem of the non-adjustable ventilation volume of traditional fixed flue gas, avoid poor flue gas flow or incomplete emission, significantly improve boiler operating efficiency and reduce energy consumption.

[0017] 2. The boiler flue connection structure with self-regulating ventilation volume, based on multi-sensor data feedback of furnace pressure, flue gas pressure, flue gas temperature and flow rate, ensures that safety regulation is prioritized under abnormal operating conditions such as high temperature and overpressure, preventing flue gas backflow or equipment overheating damage, and greatly improving system safety.

[0018] 3. The boiler flue connection structure with self-regulating ventilation volume adopts a dual dynamic sealing structure of high-temperature resistant sealing rubber and frame-shaped sealing rubber. It maintains the airtightness of the flue during the movement of the rectangular movable plate, avoids flue gas leakage, and reduces environmental pollution. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall first-view structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall second-view structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the self-adjusting ventilation component in this utility model;

[0022] Figure 4 This is a schematic diagram of the assembly structure of the rectangular shell and the frame-shaped sealing rubber in this utility model;

[0023] Figure 5 This is a cross-sectional structural diagram of the smoke guiding pipe in this utility model;

[0024] In the diagram: 1. Boiler flue; 2. Self-regulating ventilation assembly; 20. Rectangular housing; 200. Strip-shaped vertical opening; 21. Rectangular movable plate; 22. High-temperature resistant sealing rubber; 23. Connecting plate; 24. L-shaped mounting base; 25. Electric cylinder; 26. Frame-shaped sealing rubber; 3. Flue gas duct; 4. First pressure sensor; 5. Second pressure sensor; 6. Temperature sensor; 7. Flow sensor; 8. Anti-backflow valve; 9. Controller. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Please see Figures 1-5 This utility model provides a technical solution:

[0028] The boiler flue connection structure with self-regulating ventilation volume includes a boiler flue pipe 1. The inner wall of the boiler flue pipe 1 is equipped with a first pressure sensor 4, which is used to monitor the boiler furnace pressure in real time and feed it back to the controller 9 via an electrical signal. The boiler flue pipe 1 is connected to a flue duct 3 through a self-regulating ventilation component 2. The inner wall of the flue duct 3 is equipped with a second pressure sensor 5, a temperature sensor 6, and a flow sensor 7, which are used to continuously collect the pressure, flue gas temperature, and flow rate data in the flue duct 3, and transmit them to the controller 9 via wires for dynamic analysis.

[0029] The self-adjusting ventilation assembly 2 includes a rectangular housing 20. The boiler flue pipe 1 and the flue gas duct 3 are both connected to the rectangular housing 20. The rectangular housing 20 serves as a flue gas flow channel. A rectangular movable plate 21 is fitted inside the rectangular housing 20. The rectangular movable plate 21 adjusts the ventilation volume by moving horizontally back and forth, changing the cross-sectional area of ​​the flue. A strip-shaped vertical opening 200 is provided on the rear side of the rectangular housing 20 for the rectangular movable plate 21 to pass through. A connecting plate 23 is provided on the rear side of the rectangular movable plate 21. The connecting plate 23 serves as a rigid connection between the electric cylinder 25 and the rectangular movable plate 21, transmitting the linear motion of the electric cylinder 25 to the rectangular movable plate. 21. L-shaped mounting seats 24 are provided on both the upper and lower sides of the rectangular housing 20. The L-shaped mounting seats 24 are fixed to the outer wall of the rectangular housing 20 by bolts and are used to provide a stable mounting base for the electric cylinder 25. The electric cylinder 25 is provided on both L-shaped mounting seats 24. The stroke accuracy of the electric cylinder 25 is ±0.1mm and the response time is 50ms. It can precisely drive the rectangular movable plate 21 to move horizontally back and forth according to the instructions of the controller 9. The movable rods of the two electric cylinders 25 are fixedly connected to the front side of the connecting plate 23. An anti-backflow valve 8 is provided in the smoke guide pipe 3 near the smoke outlet. The anti-backflow valve 8 prevents the external airflow from flowing back.

[0030] In this embodiment, the smoke outlet end of the boiler smoke outlet pipe 1 is detachably connected to the left side of the rectangular shell 20 by bolts, and the smoke inlet end of the smoke guide pipe 3 is detachably connected to the right side of the rectangular shell 20 by bolts. The bolts are M12 high-strength stainless steel bolts with a preload of 80 N.m to ensure airtightness and shock resistance of the connection.

[0031] Specifically, high-temperature resistant sealing rubber 22 is provided on both the left and right sides of the rectangular movable plate 21. The high-temperature resistant sealing rubber 22 is made of silicone rubber and has a temperature resistance range of -50℃ to 300℃. It achieves dynamic sealing when the rectangular movable plate 21 moves back and forth. The opposite sides of the two high-temperature resistant sealing rubbers 22 are tightly fitted to the left and right sides of the inner wall of the rectangular shell 20 to ensure that there is no leakage of flue gas.

[0032] Furthermore, a frame-shaped sealing rubber 26 is bonded to the inner wall of the strip vertical opening 200. The frame-shaped sealing rubber 26 is made of fluororubber and has a temperature resistance range of -20℃ to 250℃. It is interference-fitted with the outer side of the rectangular movable plate 21 to form a sealing barrier. The inner wall of the frame-shaped sealing rubber 26 is tightly fitted with the outer side of the rectangular movable plate 21 to prevent flue gas from overflowing through the strip vertical opening 200.

[0033] Furthermore, the first pressure sensor 4 is located near the inlet end of the boiler flue pipe 1 and is used to monitor the boiler furnace pressure. Its range is -10kPa to +10kPa and its accuracy class is 0.5. Real-time data is transmitted to the controller 9 via a 4-20mA current signal.

[0034] Furthermore, the second pressure sensor 5, temperature sensor 6, and flow sensor 7 are all located near the smoke inlet end of the flue gas duct 3, and are used to monitor the pressure, flue gas temperature, and flue gas velocity within the flue gas duct 3, respectively. The second pressure sensor 5 has a range of -5 kPa to +5 kPa and is used to monitor pressure fluctuations within the flue gas duct 3. The temperature sensor 6 is a type K thermocouple with a measurement range of 0℃ to 600℃ and is used to detect the flue gas temperature. The flow sensor 7 is a thermal mass flow meter with a measurement accuracy of ±1%FS and is used to provide real-time feedback on the flue gas velocity.

[0035] Furthermore, a controller 9 is provided on the right side of the rectangular housing 20. The electric cylinder 25, the first pressure sensor 4, the second pressure sensor 5, the temperature sensor 6, and the flow sensor 7 are electrically connected to the controller 9 via wires. The controller 9 has a built-in control algorithm that calculates the target position of the electric cylinder 25 and outputs a control signal based on the feedback signals from the first pressure sensor 4, the second pressure sensor 5, the temperature sensor 6, and the flow sensor 7.

[0036] It should be added that the control logic of controller 9 is explained as follows:

[0037] 1. Triggering conditions and actions

[0038] A. Furnace pressure too high: The reading detected by the first pressure sensor 4 exceeds the safety threshold.

[0039] The controller 9 controls the extension of the movable rod of the electric cylinder 25, which pushes the rectangular movable plate 21 to move backward, increasing the cross-sectional area of ​​the flue and increasing the ventilation volume to reduce the furnace pressure.

[0040] B. Low pressure in the smoke extraction duct: The second pressure sensor 5 detects a value below the set range.

[0041] The controller 9 controls the retraction of the movable rod of the electric cylinder 25, which pulls the rectangular movable plate 21 forward, reducing the cross-sectional area of ​​the flue and decreasing the ventilation volume in order to increase the duct pressure.

[0042] C. Abnormal flue gas temperature: Temperature sensor 6 detected a value exceeding the set threshold.

[0043] High temperature: The controller 9 controls the extension of the movable rod of the electric cylinder 25, which pushes the rectangular movable plate 21 to move backward, increasing the ventilation volume to accelerate the exhaust of flue gas and reduce the temperature inside the flue.

[0044] Low temperature: The controller 9 controls the electric cylinder 25 to retract its movable rod, pulling the rectangular movable plate 21 forward to reduce the ventilation volume and reduce heat loss.

[0045] D. Insufficient flue gas velocity: The flow sensor 7 detects a value lower than the set value.

[0046] If the first pressure sensor 4 detects that the furnace pressure is within a safe range, the controller 9 controls the electric cylinder 25 to extend its movable rod, pushing the rectangular movable plate 21 to move backward to increase the flow rate.

[0047] 2. Sensor Priority

[0048] Highest priority: first pressure sensor 4 and temperature sensor 6.

[0049] Secondary priority: second pressure sensor 5 and flow sensor 7.

[0050] Control principle: When multiple sensor data conflict, prioritize responding to abnormal furnace pressure or high temperature alarms, and then optimize secondary parameters.

[0051] 3. Comprehensive adjustment

[0052] The controller 9 integrates data from various sensors using a PID algorithm and dynamically adjusts the extension and retraction of the electric cylinder 25's movable rod according to priority to ensure that the ventilation volume is optimal within a safe range.

[0053] In this embodiment, the boiler flue connection structure with self-regulating ventilation volume is used by first connecting the outlet end of the boiler flue pipe 1 to the left flange of the rectangular housing 20 of the self-regulating ventilation component 2 using high-strength bolts, and connecting the inlet end of the flue pipe 3 to the right flange of the rectangular housing 20 using bolts of the same specification, ensuring that the boiler flue pipe 1, the rectangular housing 20, and the flue pipe 3 form a sealed flue. After startup, the controller 9 receives in real time the furnace pressure data monitored by the first pressure sensor 4 installed on the inner wall of the boiler flue pipe 1, as well as the pipe pressure, flue gas temperature, and flow rate data fed back by the second pressure sensor 5, temperature sensor 6, and flow sensor 7 installed on the inner wall of the flue pipe 3, respectively. When the furnace pressure is detected to be too high, the controller 9 controls the movable rod of the electric cylinder 25 to extend, pushing the connecting plate 23 and the rectangular movable plate 21 fixed thereon to move backward, increasing the flue cross-sectional area of ​​the rectangular housing 20 to increase the ventilation volume. Airflow; When the pressure in the flue duct 3 is too low, the controller 9 controls the movable rod of the electric cylinder 25 to retract, pulling the rectangular movable plate 21 forward to reduce the cross-sectional area; When the flue gas velocity in the flue duct 3 is insufficient, the controller 9 controls the movable rod of the electric cylinder 25 to extend, pushing the rectangular movable plate 21 backward to increase the cross-sectional area of ​​the flue and increase the flow velocity; When the temperature in the flue duct 3 is too high, the controller 9 controls the movable rod of the electric cylinder 25 to extend, pushing the rectangular movable plate 21 backward to increase the ventilation volume to accelerate the exhaust of flue gas and reduce the temperature in the flue; The high-temperature resistant sealing rubber 22 on the left and right sides of the rectangular movable plate 21 is always in close contact with the inner wall of the rectangular shell 20 during the movement, and the frame-shaped sealing rubber 26 at the strip vertical opening 200 deforms synchronously to prevent flue gas leakage; The L-shaped mounting base 24 provides stable support for the electric cylinder 25 to ensure the horizontal movement accuracy of the rectangular movable plate 21; The anti-backflow valve 8 prevents backflow of airflow.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A self-regulating flue gas connection structure of a boiler, comprising a boiler flue gas outlet pipe (1), characterized in that: The inner wall of the boiler flue pipe (1) is provided with a first pressure sensor (4). The boiler flue pipe (1) is connected to a flue pipe (3) through a self-adjusting ventilation assembly (2). The inner wall of the flue pipe (3) is provided with a second pressure sensor (5), a temperature sensor (6), and a flow sensor (7). The self-adjusting ventilation assembly (2) includes a rectangular housing (20). The boiler flue pipe (1) and the flue pipe (3) are both connected to the rectangular housing (20). A rectangular movable plate (2) is sleeved inside the rectangular housing (20). 1) The rectangular shell (20) has a strip-shaped vertical opening (200) on the rear side for the rectangular movable plate (21) to pass through. The rectangular movable plate (21) has a connecting plate (23) on the rear side. The rectangular shell (20) has L-shaped mounting seats (24) on both the upper and lower sides. Both L-shaped mounting seats (24) have electric cylinders (25). The movable rods of both electric cylinders (25) are fixedly connected to the front side of the connecting plate (23). The smoke guide pipe (3) has an anti-backdraft valve (8) in the middle and near the smoke outlet.

2. The self-regulating flue gas connection of a boiler according to claim 1, characterized in that: The smoke outlet end of the boiler flue pipe (1) is detachably connected to the left side of the rectangular shell (20) by bolts, and the smoke inlet end of the flue pipe (3) is detachably connected to the right side of the rectangular shell (20) by bolts.

3. The self-regulating flue gas connection of claim 1, wherein: The rectangular movable plate (21) is provided with high temperature resistant sealing rubber (22) on both the left and right sides, and the opposite sides of the two high temperature resistant sealing rubbers (22) are tightly attached to the left and right sides of the inner wall of the rectangular shell (20).

4. The self-regulating flue gas connection of claim 1, wherein: The inner wall of the strip-shaped vertical opening (200) is bonded with a frame-shaped sealing rubber (26), and the inner wall of the frame-shaped sealing rubber (26) is tightly fitted to the outer side of the rectangular movable plate (21).

5. The self-regulating flue gas connection of claim 1, wherein: The first pressure sensor (4) is located near the inlet end of the boiler flue pipe (1) and is used to monitor the boiler furnace pressure.

6. The boiler flue connection structure with self-adjusting ventilation volume according to claim 1, characterized in that: The second pressure sensor (5), temperature sensor (6) and flow sensor (7) are all located near the smoke inlet end of the smoke guide pipe (3) and are used to monitor the pressure, flue gas temperature and flue gas flow rate in the smoke guide pipe (3), respectively.

7. The boiler flue connection structure with self-regulating ventilation volume according to claim 1, characterized in that: The right side of the rectangular housing (20) is provided with a controller (9), and the electric cylinder (25), the first pressure sensor (4), the second pressure sensor (5), the temperature sensor (6) and the flow sensor (7) are electrically connected to the controller (9) through wires.

Images