Air supply device and method for automatically adjusting air supply amount and oxygen content based on boiler temperature

Abstract

The invention discloses an air supply device and method for automatically adjusting the air supply amount and the oxygen content based on the boiler temperature. The device comprises a draught fan, an air supply pipeline, an auxiliary oxygen pipeline, an adjusting mechanism, an air storage part, a heating part and a thermal expansion and cold contraction part. One end of the air supply pipeline is communicated with the fan, and the other end is butted with a boiler air inlet; two ends of the auxiliary oxygen pipeline are respectively communicated with the air storage cavity of the air storage part and the air supply pipeline; the heating piece is assembled on the gas storage piece and is used for heating oxygen in the gas storage cavity and the thermal expansion and cold contraction piece; the heat expansion and cold contraction piece is fixedly connected with the sealing plate, the sealing plate can be driven to move in a reciprocating mode through the heat expansion and cold contraction effect so as to adjust the through-flow area of a communication channel between the gas storage cavity and the auxiliary oxygen pipeline, the heat expansion and cold contraction piece and the draught fan cooperate to achieve automatic adjustment of the air supply amount and the oxygen content based on the boiler temperature, manual intervention is reduced, and the efficiency is improved. The service life of equipment is prolonged, and stable and efficient operation of the boiler is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of boiler air volume regulation technology, specifically relating to an air supply device and method for automatically adjusting air volume and oxygen content based on boiler temperature. Background Technology

[0002] As the core equipment of a thermal power plant, the boiler's combustion efficiency and operational stability directly affect the power plant's capacity and equipment lifespan. During the boiler combustion heating process, the traditional air supply method has the problem of uneven distribution of the introduced air inside the boiler, resulting in incomplete fuel combustion and unbalanced heat distribution. This uneven combustion can easily cause the temperature in some areas of the boiler to be too low, causing the unburned fuel to sinter. This not only reduces fuel utilization but also seriously damages boiler components, shortens the equipment's service life, and restricts the long-term stable operation of the boiler. Summary of the Invention

[0003] The purpose of this invention is to provide an air supply device and method that automatically adjusts the air supply volume and oxygen content based on boiler temperature, in order to solve the technical defects of traditional air supply methods, such as uneven air distribution in the boiler, incomplete fuel combustion, unbalanced heat distribution, and localized low temperature leading to fuel sintering, boiler component wear, and shortened equipment life.

[0004] To achieve the above objectives, this application provides the following technical solution: A first aspect of this application provides an air supply device that automatically adjusts the air volume and oxygen content based on boiler temperature, comprising: The components include a blower, an air supply duct, an auxiliary oxygen duct, a regulating mechanism, an air storage device, a heating device, and thermal expansion and contraction components; one end of the air supply duct is connected to the blower, and the other end is used to connect to the boiler air inlet. The two ends of the auxiliary oxygen pipeline are respectively connected to the gas storage chamber of the gas storage device and the air supply pipeline; The heating element is assembled on the gas storage component and is used to heat the oxygen in the gas storage cavity and the thermal expansion and contraction component. The thermal expansion and contraction component is fixedly connected to the sealing plate and can drive the sealing plate to move back and forth through thermal expansion and contraction to adjust the flow area of ​​the communication channel between the gas storage chamber and the auxiliary oxygen pipeline. The thermal expansion and contraction component works in conjunction with the fan to achieve automatic adjustment of the air volume and oxygen content based on the boiler temperature.

[0005] In one optional embodiment, the gas storage component is provided with a mounting cavity adapted to the thermal expansion and contraction component; The mounting cavity and the gas storage cavity are arranged at intervals by a partition structure, and the heating element is provided with an independent heating part corresponding to the cavity wall area of ​​the mounting cavity and the cavity wall area of ​​the gas storage cavity. The independent heating part synchronously responds to the boiler temperature change and heats the thermal expansion and contraction component and the oxygen in the gas storage cavity respectively.

[0006] In one optional embodiment, the partition structure is a heat-insulating partition plate, which is embedded inside the gas storage component to block heat conduction between the mounting cavity and the gas storage cavity; Furthermore, the independent heating components are respectively fitted to the inner wall of the mounting cavity and the inner wall of the gas storage cavity to improve the heating efficiency and temperature control accuracy of the thermally expanding and contracting components and the oxygen in the gas storage cavity.

[0007] In one optional embodiment, a sealing gasket is fixedly provided on the side of the sealing plate facing the communication channel between the gas storage chamber and the auxiliary oxygen pipeline. The sealing gasket is made of high-temperature resistant elastic sealing material and its shape is adapted to the port contour of the communication channel. This is used to enhance the sealing performance of the sealing plate to the communication channel and ensure the accuracy of the on / off control when the oxygen content is adjusted by the thermal expansion and contraction components.

[0008] In one optional embodiment, the thermal expansion and contraction component is a shape memory alloy rod. One end of the shape memory alloy rod is fixedly connected to the inner wall of the mounting cavity of the gas storage component, and the other end is fixedly connected to the side of the sealing plate opposite to the communication channel. The phase change temperature range of the shape memory alloy rod is adapted to the preset operating temperature range of the boiler, so as to drive the sealing plate to move through precise thermal expansion and contraction deformation, thereby achieving adaptive adjustment of oxygen content.

[0009] In one optional embodiment, the adjustment mechanism includes: A flow sensor and a controller are provided, wherein the flow sensor is embedded in the auxiliary oxygen pipeline and is used to collect the oxygen flow signal in the auxiliary oxygen pipeline in real time and transmit it to the controller. The controller is electrically connected to the flow sensor, heating element, and fan respectively. It can dynamically adjust the heating power of the heating element and the air supply power of the fan by combining the temperature signal and oxygen flow signal of the boiler, so as to achieve coordinated control of air supply and oxygen content.

[0010] In one optional embodiment, a mixing chamber is provided at the connection node between the air supply duct and the auxiliary oxygen duct, and the inner wall of the mixing chamber is integrally formed with a plurality of spaced turbulence protrusions. The aforementioned turbulence protrusions are arranged in an alternating pattern to disrupt the airflow layer and enhance the turbulent mixing effect of air and oxygen, so as to ensure that the mixed airflow is evenly delivered into the boiler and improve combustion efficiency.

[0011] In one optional embodiment, a pressure detection interface is provided through the side wall of the gas storage device, and a pressure sensor is sealed and fitted at the pressure detection interface. The detection end of the pressure sensor is connected to the inside of the gas storage chamber, and is used to collect the oxygen pressure signal in the gas storage chamber in real time, so as to provide pressure feedback basis for dynamic control of air volume and oxygen content and ensure oxygen supply stability.

[0012] In one optional embodiment, the heating element is an embedded electric heating tube, which is disposed inside the wall of the gas storage component. Its heating area covers the bottom area of ​​the gas storage cavity and the outer periphery of the thermal expansion and contraction component to achieve directional heating. The auxiliary oxygen pipeline is sealed with a one-way valve, which is directed from the gas storage chamber to the air supply pipeline to prevent the airflow from flowing back.

[0013] A second aspect of this application provides a method for automatically adjusting the air supply volume and oxygen content based on boiler temperature. The method employs the air supply device described above for automatically adjusting the air supply volume and oxygen content based on boiler temperature, and includes: Connect the air supply duct to the boiler air inlet and connect the air storage chamber to the oxygen source; Real-time acquisition of temperature signals inside the boiler, oxygen flow signals in the auxiliary oxygen pipeline, and oxygen pressure signals in the gas storage chamber; The controller adjusts the fan power and heating element power based on the boiler temperature signal, along with the oxygen flow and pressure signals. The heating element heats the oxygen and thermal expansion and contraction components in the gas storage chamber through independent heating sections. The thermal expansion and contraction components deform with temperature changes, driving the sealing plate to move back and forth and adjusting the flow area of ​​the communication channel between the gas storage chamber and the auxiliary oxygen pipeline. Air is sent into the air supply duct by the fan, and mixed with oxygen supplied by the auxiliary oxygen duct in the mixing chamber through turbulent flow caused by turbulent protrusions. Then, it is evenly sent into the boiler, realizing adaptive dynamic adjustment of air supply volume and oxygen content.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By supplementing the oxygen required for combustion through auxiliary oxygen pipelines, and cooperating with the mixing structure to enhance the uniformity of air-oxygen mixing, fuel utilization is significantly improved. The heating element simultaneously heats the oxygen in the gas storage chamber and the thermal expansion and contraction parts, which not only meets the heat requirements of boiler combustion, but also precisely controls the oxygen supply flux through the deformation of the thermal expansion and contraction parts. The overall structure enables adaptive dynamic adjustment of air supply parameters, reduces manual intervention costs, reduces boiler operating losses, extends equipment service life, and ensures long-term stable and efficient boiler operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of an air supply device for automatically adjusting air volume and oxygen content based on boiler temperature, with one side of the gas storage component removed, provided by the present invention. Figure 2 This is a schematic diagram of the structure of an air supply device that automatically adjusts the air supply volume and oxygen content based on boiler temperature, with the upper part of the gas storage component removed.

[0017] In the diagram: 1. Fan; 2. Air supply duct; 3. Auxiliary oxygen duct; 4. Adjustment mechanism; 5. Gas storage component; 6. Gas storage chamber; 7. Heating component; 8. Support component; 9. Thermal expansion and contraction component; 10. Insert shaft; 11. Sealing plate. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] To address the technical deficiencies mentioned in the background section, this embodiment provides an air supply device and method for automatically adjusting the air supply volume and oxygen content based on boiler temperature.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings: like Figures 1-2As shown, in the first aspect of the present invention, an air supply device for automatically adjusting the air supply volume and oxygen content based on boiler temperature is provided, including a fan 1, an air supply duct 2, an auxiliary oxygen duct 3, an adjustment mechanism 4, an air storage component 5, an air storage chamber 6, a heating component 7, a support component 8, a thermal expansion and contraction component 9, a plug shaft 10, and a sealing plate 11.

[0023] Among them, the gas storage component 5, as the core load-bearing component of the device, is made of high temperature and corrosion resistant alloy material. It has a hollow cavity structure. The interior of the gas storage component 5 is divided into two independent cavities by a partition structure, namely the gas storage cavity 6 and the installation cavity. The gas storage cavity 6 is used to store the oxygen to be transported to the boiler, and the installation cavity is used to accommodate the thermal expansion and contraction component 9, ensuring that the deformation of the thermal expansion and contraction component 9 is not affected by the oxygen pressure and temperature fluctuations in the gas storage cavity 6, and at the same time providing stable installation support for the thermal expansion and contraction component 9.

[0024] The support component 8 is made of high-strength metal and is symmetrically assembled on the bottom and sides of the gas storage component 5. The bottom of the support component 8 is equipped with anti-slip pads and fixing holes, and is fixedly connected to the ground or bracket around the boiler using expansion bolts. This ensures the stability of the entire air supply device during operation, preventing displacement or shaking caused by vibrations from the fan 1 or impacts from component movements, and guaranteeing the sealing and operational accuracy of all component connections. The height of the support component 8 can be finely adjusted according to the height of the boiler's air inlet, adapting to the installation requirements of different boiler models and improving the device's versatility.

[0025] The air supply duct 2 is made of high-temperature resistant and wear-resistant seamless steel pipe. Its diameter is designed according to the rated air supply volume of the boiler to ensure that the air resistance is small when flowing in the duct, and to avoid duct vibration caused by excessive airflow speed.

[0026] One end of the air supply duct 2 is sealed to the air outlet of the fan 1 through a flange structure. A sealing gasket is provided at the flange connection to prevent air leakage. The other end of the air supply duct 2 is connected to the boiler air inlet through a flexible joint. The flexible joint can effectively buffer the vibration generated by the operation of the fan 1 and the airflow impact in the duct, avoid damage to the boiler air inlet, and facilitate fine-tuning of the position during installation to ensure the sealing of the connection.

[0027] The auxiliary oxygen pipeline 3 is made of corrosion-resistant stainless steel and has a smaller diameter than the air supply pipeline 2. Its diameter is determined according to the rated oxygen supply requirements of the boiler and the output capacity of the gas storage chamber 6. One end of the auxiliary oxygen pipeline 3 is sealed to the side wall of the gas storage component 5 by welding and is connected to the inside of the gas storage chamber 6. The connection part is inspected for flaws to ensure that there is no oxygen leakage. The other end of the auxiliary oxygen pipeline 3 is connected to the air supply pipeline 2 through a T-joint. The T-joint is embedded in the inner wall of the air supply pipeline 2 so that the oxygen transported by the auxiliary oxygen pipeline 3 can be directly injected into the main air flow channel of the air supply pipeline 2, which facilitates the initial mixing of air and oxygen.

[0028] A one-way valve is sealed and installed on the auxiliary oxygen pipeline 3. The one-way valve adopts a high-temperature resistant sealing structure, and its conduction direction is strictly limited to from the gas storage chamber 6 to the air supply pipeline 2. The one-way valve can effectively block the backflow of airflow, prevent air and combustion products in the air supply pipeline 2 from flowing back into the gas storage chamber 6, avoid contaminating the oxygen in the gas storage chamber 6, and prevent pressure imbalance in the gas storage chamber 6, ensuring the one-way nature of the oxygen delivery path and the stability of oxygen supply. The valve body of the one-way valve adopts an integrated molding structure, and the internal valve core uses elastic sealing material to ensure reliable conduction within the rated pressure range and achieve a tight seal under reverse pressure.

[0029] Fan 1 is a variable frequency centrifugal fan, whose rated air volume and pressure are matched with the rated combustion requirements of the boiler. Fan 1 is fixed to one side of support member 8 by bracket. The power interface of fan 1 is electrically connected to an external control system. The air supply power can be changed by adjusting the variable frequency parameters of fan 1, so as to achieve precise adjustment of air supply volume. The air inlet of fan 1 is equipped with a filter screen to filter impurities and particulate matter in the air, preventing impurities from entering the air supply duct 2 and the boiler, and preventing wear or blockage of the boiler combustion components and pipes.

[0030] The heating element 7 uses an embedded electric heating tube made of high-temperature resistant alloy. Its resistance value is designed according to the heating power requirements to ensure rapid heating and maintain a stable heating effect. The heating element 7 is embedded inside the wall of the gas storage component 5. This embedded installation method avoids direct contact between the heating element 7 and the oxygen in the gas storage cavity 6, preventing the oxygen from reacting with the heating element 7 at high temperatures and improving heat transfer efficiency. The heating area of ​​the heating element 7 precisely covers the bottom area of ​​the gas storage cavity 6 and the outer periphery of the thermal expansion and contraction component 9, achieving directional heating of the oxygen in the gas storage cavity 6 and the thermal expansion and contraction component 9. This ensures that heat is concentrated on the target area, improving temperature control accuracy.

[0031] The thermal expansion and contraction component 9 is made of shape memory alloy rod. The material of the shape memory alloy rod is nickel-titanium alloy, which has excellent thermal expansion and contraction deformation performance and shape memory effect, and can undergo recoverable deformation within a specific temperature range.

[0032] One end of the thermal expansion and contraction component 9 is fixedly connected to the inner wall of the installation cavity of the gas storage component 5 by welding. The connection part adopts a reinforced structure to ensure that it can withstand the driving force generated when the thermal expansion and contraction component 9 deforms. The other end of the thermal expansion and contraction component 9 is fixedly connected to the insertion shaft 10. The insertion shaft 10 is made of high-strength metal rod, and its axis is consistent with the axis of the thermal expansion and contraction component 9 to ensure that the deformation of the thermal expansion and contraction component 9 can be accurately transmitted to the sealing plate 11 through the insertion shaft 10.

[0033] The other end of the insert shaft 10 is fixedly connected to the sealing plate 11. The sealing plate 11 is made of high-temperature resistant alloy material and has an overall circular structure. Its diameter is slightly larger than the port diameter of the connecting channel between the gas storage chamber 6 and the auxiliary oxygen pipeline 3, ensuring effective sealing of the connecting channel. A sealing gasket is fixed to the side of the sealing plate 11 facing the connecting channel by bolts. The sealing gasket is made of high-temperature resistant elastic sealing material, and its shape is adapted to the port contour of the connecting channel. The thickness of the sealing gasket is designed according to the sealing pressure requirements to ensure that it can tightly fit the port of the connecting channel under the compression of the sealing plate 11, achieving a tight seal.

[0034] A guide structure is provided between the sealing plate 11 and the gas storage component 5. The guide structure includes a guide groove on the inner wall of the mounting cavity of the gas storage component 5 and a guide block on the side of the sealing plate 11. The guide block slides within the guide groove, and the clearance between the guide groove and the guide block is controlled between 0.1-0.2 mm to ensure that the sealing plate 11 can move smoothly back and forth along the guide groove, preventing the sealing plate 11 from shifting or getting stuck during movement, and ensuring the accuracy of the sealing plate 11 in adjusting the flow area of ​​the connecting channel. The inner wall of the guide groove is provided with a lubrication layer filled with high-temperature resistant grease to reduce the friction between the guide block and the guide groove and improve the smoothness of the movement of the sealing plate 11.

[0035] The regulating mechanism 4 includes a flow sensor, a controller, and a temperature sensor. The temperature sensor is installed inside the boiler to collect the temperature signal inside the boiler in real time and transmit the temperature signal to the controller.

[0036] The flow sensor is embedded in the auxiliary oxygen pipeline 3. It adopts a high-precision flow detection element and can collect the oxygen flow signal in the auxiliary oxygen pipeline 3 in real time. After processing, the flow signal is transmitted to the controller, providing a basis for the controller to adjust the oxygen supply parameters.

[0037] The controller adopts an industrial-grade programmable logic controller (PLC). The controller is installed close to the gas storage unit 5, which facilitates electrical connection with various detection elements and actuators. The controller is electrically connected to the flow sensor, heating element 7, fan 1 and temperature sensor respectively. It can receive signals transmitted by each detection element and dynamically adjust the heating power of heating element 7 and the air supply power of fan 1 according to the preset control logic to achieve coordinated control of air supply volume and oxygen content.

[0038] The controller is equipped with a display screen and operation buttons, which can display parameters such as boiler temperature, oxygen flow rate, and fan power in real time. It also supports manual intervention and adjustment, which allows operators to correct parameters according to actual working conditions.

[0039] A pressure detection interface is provided through the side wall of the gas storage component 5. A pressure sensor is installed at the pressure detection interface with a threaded seal. The detection end of the pressure sensor extends into the gas storage chamber 6 to collect the oxygen pressure signal in the gas storage chamber 6 in real time. The pressure sensor is electrically connected to the controller and transmits the collected pressure signal to the controller. When the pressure in the gas storage chamber 6 is lower than the preset value, the controller issues an alarm signal to remind the operator to replenish oxygen in time. When the pressure is higher than the preset value, the controller can control the exhaust valve (not shown) of the gas storage chamber 6 to open, release excess pressure, ensure the safe operation of the gas storage chamber 6, and provide pressure feedback for the dynamic control of air volume and oxygen content.

[0040] A mixing chamber is provided at the connection node between the air supply duct 2 and the auxiliary oxygen duct 3. The mixing chamber adopts an integrated molding structure and is seamlessly connected to the air supply duct 2 and the auxiliary oxygen duct 3. The inner diameter of the mixing chamber is larger than the inner diameter of the air supply duct 2, so that air and oxygen can have sufficient mixing space in the mixing chamber. The inner wall of the mixing chamber is integrally molded with several spaced turbulence protrusions. The turbulence protrusions are arranged in an alternating manner, and the spacing between the protrusions is uniformly set.

[0041] The turbulence protrusions effectively disrupt the laminar flow of the airflow, creating turbulence between the air in the supply air duct 2 and the oxygen delivered by the auxiliary oxygen duct 3 within the mixing chamber. This turbulence ensures thorough mixing of the air and oxygen, guaranteeing a uniform oxygen content in the mixed airflow. This uniformly mixed airflow, once introduced into the boiler, allows for full contact between the fuel and oxygen, improving combustion uniformity and preventing incomplete or excessive combustion in certain areas, thus further optimizing boiler combustion efficiency.

[0042] The mounting cavity of the gas storage component 5 and the gas storage cavity 6 are arranged at intervals by a partition structure. The partition structure is a heat-insulating partition plate, which is made of high-temperature heat-insulating material and is embedded inside the gas storage component 5. The edge of the heat-insulating partition plate is tightly fitted to the inner wall of the gas storage component 5 and sealed with sealant to block heat conduction between the mounting cavity and the gas storage cavity 6.

[0043] The heat insulation partition can prevent the heat from the heating element 7 from heating the oxygen in the gas storage chamber 6 and affecting the deformation accuracy of the thermal expansion and contraction element 9. It also prevents the heat generated by the thermal expansion and contraction element 9 from being transferred back to the gas storage chamber 6, ensuring that the heating of oxygen and the thermal expansion and contraction element 9 can be controlled independently and improving the overall temperature regulation accuracy.

[0044] The heating element 7 has an independent heating section in the cavity wall area of ​​the mounting cavity and the cavity wall area of ​​the gas storage cavity 6. The two independent heating sections are electrically connected to the controller, which can realize independent start-stop and power adjustment.

[0045] The independent heating elements are respectively fitted to the inner walls of the mounting cavity and the gas storage cavity 6. Thermally conductive silicone is used to fill the space between the heating elements and the cavity walls to improve heat conduction efficiency and ensure that heat can be quickly transferred to the thermal expansion and contraction parts 9 and the oxygen in the gas storage cavity 6, while reducing heat loss and improving energy utilization.

[0046] The overall dimensions of the gas storage unit 5 are designed according to the rated oxygen supply requirements of the boiler, and it can store a sufficient amount of oxygen to ensure that the device can still maintain normal oxygen supply and ensure the continuity of boiler combustion when the oxygen supply is interrupted for a short period of time.

[0047] The gas storage component 5 has a wall thickness of 10-15mm and is forged from high-strength alloy material. It can withstand the rated pressure of oxygen in the gas storage chamber 6 (usually 0.5-1MPa) and has good high-temperature resistance, so it can work stably for a long time in the high-temperature environment around the boiler.

[0048] The inner wall of the gas storage chamber 6 is polished to reduce resistance to oxygen flow and prevent impurities from adhering to the chamber wall. An oxygen replenishment port is located at the top of the gas storage chamber 6 for connection to an external oxygen supply mechanism. A solenoid valve is installed at the oxygen replenishment port, electrically connected to a controller. The controller controls the opening and closing of the solenoid valve based on the pressure signal within the gas storage chamber 6, enabling automatic oxygen replenishment. A drain port is located at the bottom of the gas storage chamber 6 for periodically draining accumulated water and impurities. The drain port is sealed under normal conditions and opened for drainage during periodic maintenance.

[0049] The dimensions of the mounting cavity are matched with the dimensions of the thermal expansion and contraction component 9 to ensure that the thermal expansion and contraction component 9 can deform freely in the mounting cavity. The top of the mounting cavity is provided with an inspection port, and a sealing cover is provided at the inspection port to facilitate maintenance and repair of the thermal expansion and contraction component 9, the insert shaft 10 and the sealing plate 11.

[0050] Temperature detection points are provided on the inner wall of the mounting cavity to monitor the temperature inside the mounting cavity in real time. The temperature detection points are electrically connected to the controller to provide auxiliary basis for power adjustment of the heating element 7.

[0051] The shape memory alloy rod used in the thermal expansion and contraction component 9 has a phase transformation temperature range that matches the preset operating temperature range of the boiler, ensuring that the shape memory alloy rod can be indirectly driven to deform through changes in boiler temperature.

[0052] The length of the insert shaft 10 is adapted to the deformation stroke of the shape memory alloy rod. Both ends of the insert shaft 10 are fixedly connected to the thermal expansion and contraction component 9 and the sealing plate 11 by threads, respectively. The connection parts are locked with anti-loosening nuts to prevent loosening during long-term deformation transmission. The surface of the insert shaft 10 is hardened to improve wear resistance and fatigue strength, ensuring that it can withstand the driving force of the shape memory alloy rod for a long time.

[0053] The sealing plate 11 has sufficient structural strength to prevent deformation under pressure. The sealing gasket is made of fluororubber, which has excellent high-temperature resistance and elastic sealing performance, maintaining a sealing effect under long-term high-temperature environments. It also has good corrosion resistance, preventing reaction with oxygen. The sealing gasket is fixedly connected to the sealing plate 11 by countersunk bolts. The bolt heads are embedded inside the sealing gasket to ensure that the surface of the sealing gasket is flat and can fit tightly with the port of the connecting channel.

[0054] The number of embedded electric heating tubes in the heating element 7 is set according to the heating power requirements, usually 2-4, and they are evenly distributed inside the wall of the gas storage component 5 to ensure that the heating area can evenly cover the bottom of the gas storage cavity 6 and the outer periphery of the thermal expansion and contraction component 9. The rated voltage of the electric heating tube is 380V and the rated power is 2-5kW. The heating power can be adjusted by the controller to achieve precise temperature control.

[0055] The heating element 7 has independent heating sections corresponding to the gas storage chamber 6 and the mounting chamber, respectively. The heating section corresponding to the gas storage chamber 6 has a slightly higher power than the heating section corresponding to the mounting chamber, ensuring that the oxygen in the gas storage chamber 6 can be rapidly heated to the preset temperature, while preventing excessive deformation of the thermal expansion and contraction component 9 due to excessively high temperature in the mounting chamber. The electric heating tube of the heating element 7 is equipped with an insulating protective sleeve made of high-temperature resistant insulating material to prevent short circuits between the electric heating tube and the wall of the gas storage component 5, ensuring electrical safety.

[0056] An overheat protection device is installed in the circuit of the heating element 7. When the temperature of the heating element 7 exceeds a preset threshold, the overheat protection device automatically cuts off the power supply to prevent the heating element 7 from being damaged due to overheating. At the same time, it avoids overheating of the oxygen in the gas storage chamber 6 and the thermal expansion and contraction component 9, ensuring the safe operation of the device. The overheat protection device is electrically connected to the controller. When the overheat protection is activated, the controller issues an alarm signal to remind the operator to troubleshoot the fault in time.

[0057] The flow sensor is an electromagnetic flow sensor with a measurement range of 0-50 m³ / h and a measurement accuracy of ±1%, capable of accurately acquiring the oxygen flow signal within the auxiliary oxygen pipeline 3. The flow sensor is installed close to the connection point between the auxiliary oxygen pipeline 3 and the air supply pipeline 2 to ensure that the acquired flow signal accurately reflects the amount of oxygen entering the air supply pipeline 2. The probe of the flow sensor is made of corrosion-resistant material to avoid reaction with oxygen, and also possesses good high-temperature resistance to adapt to the high-temperature environment inside the pipeline.

[0058] The temperature sensor uses a thermocouple with a measurement range of 0-1200℃ and an accuracy of ±2℃, enabling precise acquisition of temperature signals within the boiler. The sensor's probe extends into the core combustion zone inside the boiler, ensuring that the acquired temperature signal accurately reflects the boiler's combustion temperature. The sensor's leads are made of high-temperature shielded wire to prevent external interference from affecting the temperature measurement accuracy, and the leads are protected by a sheath to prevent damage from the boiler's high temperatures.

[0059] The pressure sensor is a diffused silicon pressure sensor with a measurement range of 0-2 MPa and a measurement accuracy of ±0.5%, capable of acquiring the oxygen pressure signal within the gas storage chamber 6 in real time. The sensing end of the pressure sensor is made of stainless steel, possessing excellent corrosion resistance and high-temperature resistance. The pressure sensor outputs a 4-20mA analog signal, facilitating reception and processing by the controller. The mounting area of ​​the pressure sensor is sealed to ensure no oxygen leakage.

[0060] The controller uses a Siemens S7-200 PLC, capable of simultaneously receiving multiple signals such as temperature, flow rate, and pressure, and adjusting the operating parameters of fan 1 and heating element 7 according to a preset algorithm. The controller is powered by AC220V and operates in an ambient temperature range of 0-60℃, adapting to the ambient temperature around the boiler. The controller is equipped with an RS485 communication interface, enabling data exchange with the power plant's central control system for convenient remote monitoring and management.

[0061] First, based on the boiler's installation location and air inlet height, the core components such as the gas storage unit 5 and the fan 1 are fixed in their preset positions using the support member 8. The height of the support member 8 is adjusted to ensure that the axis of the air supply duct 2 is aligned with the axis of the boiler's air inlet, guaranteeing a smooth connection. After the support member 8 is fixed, the stability of the device is checked to ensure there is no shaking.

[0062] Secondly, connect one end of the air supply duct 2 to the air outlet of the fan 1 through a flange, lay a sealing gasket at the flange connection, and then tighten it with bolts. During the tightening process, ensure that the bolts are evenly stressed to avoid uneven stress on the sealing gasket, which could lead to air leakage. Connect the other end of the air supply duct 2 to the boiler air inlet through a flexible joint. After the connection is completed, tighten it with a hose clamp to ensure a tight seal at the connection.

[0063] Subsequently, one end of the auxiliary oxygen pipeline 3 is sealed and connected to the gas storage chamber 6 of the gas storage component 5. The connection is inspected for flaws to ensure there is no oxygen leakage. The other end of the auxiliary oxygen pipeline 3 is connected to the air supply pipeline 2 via a tee connector, and sealant is applied to the connection to enhance the seal. A one-way valve is installed on the auxiliary oxygen pipeline 3, ensuring that the one-way valve's conduction direction is from the gas storage chamber 6 to the air supply pipeline 2. After assembly, the flexibility and sealing of the one-way valve are checked.

[0064] Next, complete the assembly and wiring of the regulating mechanism 4 and each detection component. Insert the temperature sensor into the core combustion area inside the boiler and fix it firmly to ensure that the temperature sensor can stably collect temperature signals. Embed the flow sensor in the auxiliary oxygen pipeline 3 and ensure that the sensor probe is in full contact with the oxygen flow channel. Assemble the pressure sensor on the side wall of the gas storage component 5 through the pressure detection interface, ensuring that the detection end extends into the gas storage cavity 6 and that the connection is tightly sealed. Connect the wires of each detection component to the controller. After wiring, check the correctness of the wiring connection to avoid damage to the components caused by incorrect wiring.

[0065] Finally, a pretreatment operation is performed. The oxygen supply interface of the gas storage chamber 6 is connected to the external oxygen supply mechanism. The valve of the external oxygen supply mechanism is opened to inject oxygen into the gas storage chamber 6. At the same time, the drain port at the bottom of the gas storage chamber 6 is opened to release air and impurities from the chamber. After pure oxygen is discharged from the drain port, the drain port is closed. The preset operating temperature range of the boiler, the rated pressure range of the gas storage chamber 6, the rated air supply power of the fan 1, and the rated heating power of the heating element 7 are set through the controller. After the parameters are preset, the device is powered on for testing to check whether each component is working properly and whether each detection component can accurately transmit signals, ensuring that the device is in normal standby mode.

[0066] Once the equipment is installed and pre-treated, it can be started and put into operation, entering an automatic adjustment state for air volume and oxygen content based on boiler temperature. The entire working process is divided into a low-temperature adjustment stage, a constant temperature maintenance stage, and a shutdown stage. The working principle and operation logic of each stage are as follows: When the boiler starts up or operates and the temperature is lower than the preset lower limit of the operating temperature, the device enters the low temperature regulation stage. The core objective is to increase the air supply and oxygen content, enhance the boiler combustion intensity, and rapidly raise the boiler temperature to the preset range.

[0067] The specific working process is as follows: A temperature sensor inside the boiler collects the temperature signal in real time and transmits it to the controller. After processing the temperature signal, the controller determines that the boiler temperature is below a preset lower limit. At this time, the controller issues a control command to adjust the frequency conversion parameters of fan 1, increasing the air supply power of fan 1, so that fan 1 delivers more air into the air supply duct 2. After the air supply power of fan 1 increases, the air flow and pressure in the air supply duct 2 increase simultaneously, and the air flows through the air supply duct 2 to the mixing chamber.

[0068] Simultaneously, the controller controls the external oxygen supply mechanism to maintain oxygen supply to the gas storage chamber 6, ensuring that the oxygen pressure in the gas storage chamber 6 is maintained within the rated range. The controller issues a command to control the heating element 7 to start working. The two independent heating parts of the heating element 7 begin to heat the oxygen in the gas storage chamber 6 and the thermal expansion and contraction element 9 in the mounting cavity, respectively. The heating part corresponding to the gas storage chamber 6 heats up rapidly, transferring heat to the oxygen in the gas storage chamber 6, raising the oxygen temperature, increasing the oxygen's activity, and facilitating fuel combustion after mixing with air; the heating part corresponding to the mounting cavity heats up synchronously, transferring heat to the thermal expansion and contraction element 9 (shape memory alloy rod).

[0069] The thermal expansion and contraction component 9 gradually undergoes thermal expansion and deformation under the action of heat. Since one end of the shape memory alloy rod is fixed to the inner wall of the mounting cavity, an axial driving force is generated during the deformation process. This driving force is transmitted to the sealing plate 11 through the insert shaft 10.

[0070] Under the action of driving force, the sealing plate 11 moves away from the gas storage chamber 6 and the auxiliary oxygen pipeline 3 through the guide groove of the guide structure. That is, the insertion shaft 10 becomes longer with the deformation of the thermal expansion and contraction component 9, and the distance between the sealing plate 11 and the port of the connecting channel gradually increases, and the flow area of ​​the connecting channel increases accordingly.

[0071] Oxygen in the gas storage chamber 6, under pressure, enters the auxiliary oxygen pipe 3 through the connecting channel. Due to the increased flow area of ​​the connecting channel, the oxygen flow rate increases simultaneously. The oxygen is then transported through the auxiliary oxygen pipe 3 to the tee joint and injected into the main air flow channel of the air supply pipe 2, subsequently entering the mixing chamber together. Inside the mixing chamber, air and oxygen form turbulence under the action of the turbulence protrusions, achieving thorough mixing. The resulting uniform airflow is then transported to the boiler through the air supply pipe 2, providing sufficient air and oxygen for fuel combustion.

[0072] During this stage, the flow sensor collects the oxygen flow signal in the auxiliary oxygen pipeline 3 in real time, and the pressure sensor collects the oxygen pressure signal in the gas storage chamber 6 in real time. All signals are transmitted synchronously to the controller. The controller combines the boiler temperature signal, oxygen flow signal, and pressure signal to dynamically adjust the heating power of the heating element 7 and the air supply power of the fan 1: if the boiler temperature rises slowly, the controller increases the heating power of the heating element 7, which accelerates the deformation rate of the thermal expansion and contraction component 9, further increasing the flow area of ​​the connecting channel and increasing the oxygen flow. At the same time, the controller increases the air supply power of the fan 1 to increase the air volume. If the pressure in the gas storage chamber 6 is lower than the rated range, the controller controls the solenoid valve of the external oxygen supply mechanism to open, supplementing oxygen and ensuring pressure stability. If the oxygen flow exceeds the preset value, the controller appropriately reduces the heating power of the heating element 7 to slow down the deformation rate of the thermal expansion and contraction component 9 and avoid excessive oxygen.

[0073] As the mixed airflow continues to be delivered, the combustion intensity of the fuel in the boiler continuously increases, the heat generated by combustion gradually increases, and the temperature inside the boiler slowly rises. The temperature of the thermal expansion and contraction component 9 continues to rise with the increase of heating time, the degree of deformation continuously increases, the distance between the sealing plate 11 and the port of the connecting channel continuously increases, the flow area of ​​the connecting channel further increases, the oxygen supply continuously increases, forming a virtuous cycle, and pushing the boiler temperature to rapidly approach the preset range.

[0074] When the temperature inside the boiler rises to the preset operating temperature range, the device enters the constant temperature maintenance stage. The core objective is to precisely adjust the air supply volume and oxygen content to keep the boiler temperature within the preset range, ensuring complete combustion of fuel and avoiding excessively high or low local temperatures.

[0075] The specific working process is as follows: The temperature sensor continuously collects the temperature signal inside the boiler. After the controller determines that the temperature is within the preset range, it issues a control command to adjust the air supply power of the blower 1 to the rated value and maintain a stable air supply. At the same time, the controller adjusts the heating power of the heating element 7 to reduce the heating intensity, so that the heating element 7 reduces the heating of oxygen in the gas storage chamber 6 and also reduces the heating of the thermal expansion and contraction component 9.

[0076] As the heating power decreases, the temperature of the thermal expansion and contraction component 9 gradually decreases, and it begins to shrink and deform, gradually returning to its initial shape. The insertion shaft 10 shortens as the thermal expansion and contraction component 9 deforms, causing the sealing plate 11 to move along the guide groove towards the port of the connecting channel, so that the flow area of ​​the connecting channel between the gas storage chamber 6 and the auxiliary oxygen pipeline 3 gradually decreases, and the oxygen flow rate decreases synchronously.

[0077] The controller monitors changes in oxygen flow in real time by collecting oxygen flow signals from flow sensors and dynamically fine-tunes the heating power of heating element 7 in conjunction with temperature signals: If the boiler temperature shows an upward trend, the controller further reduces the heating power of heating element 7, causing thermal expansion and contraction component 9 to contract further, and sealing plate 11 to move closer to the connecting channel port, reducing the flow area and reducing oxygen flow. At the same time, the controller appropriately reduces the air supply power of fan 1 to reduce air volume and suppress temperature rise; If the boiler temperature shows a downward trend, the controller appropriately increases the heating power of heating element 7, causing thermal expansion and contraction component 9 to deform slightly, and sealing plate 11 to move slightly away from the connecting channel port, increasing the flow area and increasing oxygen flow. At the same time, the controller appropriately increases the air supply power of fan 1 to increase air volume and suppress temperature drop.

[0078] During the constant temperature maintenance phase, the pressure sensor continuously monitors the oxygen pressure in the gas storage chamber 6 to ensure that the pressure is maintained within the rated range. If the pressure is too high, the controller controls the exhaust valve of the gas storage chamber 6 to open and release excess pressure; if the pressure is too low, the controller controls the solenoid valve to open and replenish oxygen. The flow sensor and temperature sensor work together to provide the controller with accurate feedback signals, ensuring the precision of the air volume and oxygen content regulation, so that the temperature inside the boiler is always maintained within the preset range, the fuel is fully combusted, the heat is evenly distributed, and local sintering and component wear are avoided.

[0079] When fuel consumption in the boiler causes changes in combustion intensity, the temperature sensor will promptly capture the temperature fluctuation signal, and the controller will respond quickly, repeating the above adjustment process. By adjusting the air supply power of the blower 1 and the heating power of the heating element 7, the air supply volume and oxygen flow are changed to adapt to changes in combustion intensity and maintain stable boiler temperature.

[0080] When the boiler finishes combustion or needs to be shut down for maintenance, the unit enters the shutdown phase. The specific working process is as follows: the operator issues a shutdown command through the controller. The controller first controls the fan 1 to reduce the air supply power and gradually stop the air supply; at the same time, it controls the heating element 7 to stop working and no longer heats the oxygen in the gas storage chamber 6 and the thermal expansion and contraction element 9.

[0081] After the heating element 7 stops working, the temperature of the thermal expansion and contraction element 9 gradually drops to the ambient temperature, undergoes complete contraction deformation, and returns to its initial state. The insertion shaft 10 shortens, causing the sealing plate 11 to move to a position that completely fits the port of the connection between the gas storage chamber 6 and the auxiliary oxygen pipeline 3, blocking the connection and stopping the oxygen supply. The controller then closes the solenoid valve of the external oxygen supply mechanism, stopping the replenishment of oxygen into the gas storage chamber 6.

[0082] Subsequently, the controller shuts off the power supply to each detection component, and the device enters a standby state. If maintenance is required, the operator can shut off the main power supply to the device, open the drain port at the bottom of the gas storage chamber 6 to release the remaining oxygen in the chamber, and then inspect and maintain components such as the thermal expansion and contraction component 9, the insert shaft 10, and the sealing plate 11 through the maintenance port of the gas storage component 5 installation chamber. At the same time, check the sealing of the pipeline connections, the flexibility of the one-way valve, and the working status of each detection component to ensure that the device can operate normally when it is started up next time.

[0083] This device is mainly used in the air supply system of thermal power plant boilers, especially suitable for various types of thermal power plant boilers such as pulverized coal boilers and circulating fluidized bed boilers with a rated evaporation capacity of 10-100t / h. This device can effectively solve problems such as incomplete combustion, uneven heat distribution, local sintering, and component wear in the combustion process of thermal power plant boilers, improve boiler combustion efficiency and operational stability, extend boiler service life, and reduce fuel consumption and pollutant emissions, which meets the development needs of energy conservation, emission reduction, and green environmental protection in thermal power plants.

[0084] In addition, after appropriate modifications, this device can also be applied to other thermal equipment such as industrial boilers and metallurgical furnaces that require precise control of combustion temperature, air volume, and oxygen content, and has broad application prospects.

[0085] A second aspect of the present invention provides a method for automatically adjusting the air supply volume and oxygen content based on boiler temperature. The method employs the air supply device described above for automatically adjusting the air supply volume and oxygen content based on boiler temperature, and includes: Connect the air supply duct 2 to the boiler air inlet and connect the air storage chamber 6 to the oxygen source; Real-time acquisition of temperature signals inside the boiler, oxygen flow signals in auxiliary oxygen pipeline 3, and oxygen pressure signals in gas storage chamber 6; The controller adjusts the air supply power of fan 1 and the heating power of heating element 7 based on the boiler temperature signal, in conjunction with the oxygen flow and pressure signals. The heating element 7 heats the oxygen in the gas storage chamber 6 and the thermal expansion and contraction element 9 separately through independent heating parts. The thermal expansion and contraction element 9 deforms with temperature changes, driving the sealing plate 11 to move back and forth, adjusting the flow area of ​​the communication channel between the gas storage chamber 6 and the auxiliary oxygen pipeline 3. Air is sent into the air supply duct 2 by the fan 1, and mixed with oxygen supplied by the auxiliary oxygen duct 3 in the mixing chamber by turbulent flow through the turbulent protrusions. Then, it is evenly sent into the boiler to achieve adaptive dynamic adjustment of air supply volume and oxygen content.

[0086] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An air supply device that automatically adjusts the air volume and oxygen content based on boiler temperature, characterized in that, The utility model relates to a kind of oxygen content automatic regulating device for boiler, including: Fan, air supply pipeline, auxiliary oxygen pipeline, adjusting mechanism, gas storage, heating element and thermal expansion and contraction element;One end of the air supply pipeline is communicated with the fan, the other end is used to butt joint with boiler air inlet; Two ends of the auxiliary oxygen pipeline are respectively communicated with the gas storage cavity of the gas storage and the air supply pipeline; The heating element is assembled in the gas storage, for heating oxygen in the gas storage cavity and the thermal expansion and contraction element; The thermal expansion and contraction element is fixedly connected with sealing plate, can drive the reciprocating movement of the sealing plate by thermal expansion and contraction effect, to adjust the flow area of the communication passage between the gas storage cavity and the auxiliary oxygen pipeline, and the thermal expansion and contraction element cooperates with the fan, to realize the automatic regulation of the air supply volume and oxygen content based on boiler temperature.

2. The air supply device based on automatic adjustment of the air supply amount and oxygen content according to the boiler temperature according to claim 1, characterized by, The gas storage is provided with mounting cavity matched with the thermal expansion and contraction element; The mounting cavity and the gas storage cavity are arranged by separation structure, and the heating element is respectively provided with independent heating part corresponding to the cavity wall area of the mounting cavity and the cavity wall area of the gas storage cavity, and the independent heating part synchronously responds to boiler temperature change, and respectively heats the thermal expansion and contraction element and oxygen in the gas storage cavity.

3. The air supply device according to claim 2, wherein The separation structure is heat insulation partition plate, which is embedded in the gas storage, for blocking the heat conduction between the mounting cavity and the gas storage cavity; And the independent heating part is respectively arranged on the inner wall of the mounting cavity and the inner wall of the gas storage cavity, to improve the heating efficiency and temperature control precision of thermal expansion and contraction element and oxygen in the gas storage cavity.

4. The air supply device based on automatic adjustment of the air supply amount and oxygen content according to the boiler temperature according to claim 1, characterized by, The sealing plate is fixedly provided with sealing pad on the side of the communication passage of the gas storage cavity and auxiliary oxygen pipeline, the sealing pad is made of high-temperature-resistant elastic sealing material, its shape is matched with the port profile of the communication passage, for enhancing the sealing property of the sealing plate to the communication passage, to ensure the on-off control precision of the thermal expansion and contraction element when adjusting oxygen content.

5. The air supply device according to claim 1, wherein The thermal expansion and contraction element is shape memory alloy rod, one end of the shape memory alloy rod is fixedly connected with the inner wall of the mounting cavity of the gas storage, the other end is fixedly connected with the side of the sealing plate away from the communication passage, and the phase transition temperature interval of the shape memory alloy rod is matched with the preset working temperature interval of the boiler, to drive the sealing plate to move by precise thermal expansion and contraction deformation, to realize self-adaptive adjustment of oxygen content.

6. The air supply device based on automatic adjustment of the air supply amount and oxygen content according to the boiler temperature according to claim 1, characterized by, The adjusting mechanism includes: Flow sensor and controller, the flow sensor is embedded in the auxiliary oxygen pipeline, for collecting oxygen flow signal in the auxiliary oxygen pipeline in real time and transmitting to the controller; The controller is electrically connected with the flow sensor, heating element and fan, can dynamically adjust the heating power of the heating element and the air supply power of the fan, to realize the collaborative regulation of air supply volume and oxygen content, combined with the temperature signal and oxygen flow signal of the boiler.

7. The air supply device according to claim 1, wherein The communication node of the air supply pipeline and auxiliary oxygen pipeline is provided with mixing cavity, the inner wall of the mixing cavity is integrally formed with a plurality of interval distribution turbulence protrusions; Wherein, each turbulence protrusion is staggered arrangement, for destroying air layer state and enhancing the turbulent mixing effect of air and oxygen, to make mixed gas flow uniformly delivered to the boiler to improve combustion efficiency.

8. The air supply device based on automatic adjustment of the air supply amount and oxygen content according to the boiler temperature according to claim 1, characterized by, The side wall of the gas storage member is provided with a pressure detection interface, and a pressure sensor is sealingly assembled at the pressure detection interface; The detection end of the pressure sensor is connected with the inside of the gas storage cavity, for collecting the oxygen pressure signal in the gas storage cavity in real time, providing pressure feedback basis for dynamic regulation of the air supply amount and oxygen content, and ensuring oxygen supply stability.

9. The air supply device based on automatic adjustment of the air supply amount and oxygen content according to the boiler temperature according to claim 1, characterized by, The heating member is an embedded electric heating pipe, which is arranged inside the wall of the gas storage member, and its heating area covers the bottom area of the gas storage cavity and the outer periphery of the thermal expansion and contraction member, so as to realize directional heating. A one-way valve is sealingly assembled on the pipeline of the auxiliary oxygen pipeline, and the conduction direction of the one-way valve is from the gas storage cavity to the air supply pipeline, for blocking the reverse flow of air flow.

10. A method of automatically adjusting the amount of air supply and oxygen content based on the temperature of a boiler, characterized by, The method is performed by using the air supply device for automatically regulating the air supply amount and oxygen content based on the boiler temperature according to any one of claims 1-9, and includes: The air supply pipeline is connected with the boiler air inlet, and the gas storage cavity is connected with the oxygen source; The temperature signal in the boiler, the oxygen flow signal in the auxiliary oxygen pipeline, and the oxygen pressure signal in the gas storage cavity are collected in real time; The controller adjusts the air supply power of the fan and the heating power of the heating member according to the boiler temperature signal, the oxygen flow signal, and the pressure signal; The heating member heats the oxygen in the gas storage cavity and the thermal expansion and contraction member through independent heating parts. The thermal expansion and contraction member deforms with temperature change, drives the sealing plate to reciprocate, and adjusts the flow area of the communication passage between the gas storage cavity and the auxiliary oxygen pipeline. Air is sent into the air supply pipeline by the fan, and the oxygen delivered by the auxiliary oxygen pipeline is mixed with the air in the mixing cavity through the turbulent mixing of the turbulent convex, and then the air and the oxygen are uniformly sent into the boiler, so as to realize self-adaptive dynamic regulation of the air supply amount and oxygen content.

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