Porous medium burner for controlling high flow rate of gas based on constant pressure tank and working method

Abstract

The invention discloses a porous medium burner capable of controlling high gas flow rate based on a constant pressure tank and a working method, and belongs to the field of porous medium burners, the porous medium burner comprises a constant pressure tank body and a porous medium burner body, a buffer cavity is formed in the constant pressure tank body, and a pressure stabilizing assembly is arranged in the buffer cavity; the gas inlet end of the buffer cavity communicates with the gas mixer through the gas filter, the gas outlet end of the buffer cavity communicates with the gas inlet end of the porous medium burner body through a gas outlet pipeline, and a flow stabilizing assembly is arranged on the gas outlet pipeline. According to the porous medium combustor for controlling the high flow velocity of the gas based on the constant pressure tank and the working method, through cooperative work of the constant pressure tank and the flow stabilizing assembly, accurate control over the high flow velocity of the gas can be achieved, the problem of unstable combustion caused by fluctuation of the flow velocity of the gas is effectively solved, and the reliability and repeatability of the combustion process are improved.

Description

Technical Field

[0001] The invention relates to the technical field of porous medium burners, and in particular to a porous medium burner based on a constant pressure tank to control high gas flow rate and a working method. Background Art

[0002] Porous media burners have attracted much attention due to their advantages such as efficient combustion and low pollutant emissions, and are widely used in industrial heating, heat treatment, incineration and other fields. During its operation, the stability and precise control of gas flow rate play a vital role in combustion stability and temperature uniformity. Traditional gas flow rate working methods, such as regulating valves and proportional valves, often fail to meet the requirements of porous media burners for stability and accuracy under high flow rate conditions, resulting in unstable flames and uneven temperature distribution during the combustion process, which in turn affects combustion efficiency and equipment life.

[0003] Specifically, when the gas flow rate fluctuates greatly, it will lead to inadequate mixing of fuel and air, forming local over-rich or over-lean areas, which will cause flameout, flashback or incomplete combustion. These problems not only reduce combustion efficiency, but may also increase the emission of harmful pollutants, causing adverse effects on the environment and human health. In addition, uneven temperature distribution will also accelerate thermal fatigue and material aging of burner components, shorten equipment service life, and increase maintenance costs.

[0004] In order to solve the above problems, researchers and engineers have been exploring more advanced gas flow rate control technologies. As a device that can stabilize gas pressure and flow, the constant pressure tank has potential advantages and broad application prospects. The constant pressure tank ensures the stability of the gas flow rate by maintaining a constant pressure, especially under high flow rate conditions, which can effectively reduce air flow pulsation and pressure fluctuations, and improve the stability and reliability of the combustion process. However, there is currently no mature technical solution to combine the constant pressure tank with a porous media burner. The main reasons are:

[0005] 1. Difficulty in system integration: The combination of constant pressure tank and porous medium burner requires solving problems such as interface design and control system compatibility between the two.

[0006] 2. Slow dynamic response: Although the constant pressure tank can stabilize the gas pressure, its dynamic response speed may not keep up with the actual demand under rapidly changing working conditions.

[0007] 3. High cost: The introduction of a constant pressure tank will increase the complexity and cost of the system, and the performance improvement and economic benefits it brings need to be weighed. Summary of the invention

[0008] The purpose of the present invention is to provide a porous medium burner and a working method for controlling high gas flow rate based on a constant pressure tank, so as to solve the above technical problems.

[0009] To achieve the above-mentioned purpose, the present invention provides a porous medium burner based on a constant pressure tank to control high gas flow rate, including a constant pressure tank body and a porous medium burner body, a buffer chamber is arranged in the constant pressure tank body, a pressure stabilizing component is arranged inside the buffer chamber, the air inlet end of the buffer chamber is connected with the gas mixer through a gas filter, the air outlet end of the buffer chamber is connected with the air inlet end of the porous medium burner body through an air outlet pipe, and a flow stabilizing component is arranged on the air outlet pipe.

[0010] Preferably, the pressure stabilizing component includes a pressure sensor and a pressure regulating valve. The pressure sensor is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the pressure regulating valve, and is used to adjust the opening of the pressure regulating valve according to the result of comparing the internal pressure of the buffer chamber collected by the pressure sensor with the preset pressure range, so as to control the internal pressure of the buffer chamber within the preset pressure range.

[0011] Preferably, the flow stabilization component includes a flow regulating valve and a flow velocity sensor which are sequentially arranged on the air intake pipe, the flow velocity sensor is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the flow regulating valve, and is used to adjust the opening of the flow regulating valve according to the result of comparing the input flow velocity of the porous medium burner body collected by the flow velocity sensor with the preset flow velocity range, so as to control the input flow velocity of the porous medium burner body within the preset flow velocity range.

[0012] Preferably, the porous medium burner body includes an outer shell, a combustion chamber and an air outlet channel opened inside the outer shell, and a porous medium filled between the combustion chamber and the air outlet channel. The porous medium is a layered structure, and the porous medium includes a bottom layer medium, a middle layer medium and a top layer medium arranged in sequence from the combustion chamber to the air outlet channel, and the pore size and porosity of the bottom layer medium, the middle layer medium and the top layer medium decrease in sequence.

[0013] Preferably, a heat insulating layer is provided on the inner wall of the shell, and a circulating cooling channel is provided on the outer wall of the shell. The circulating cooling channel is filled with a cooling medium, and the cooling medium is cooling water or cooling air.

[0014] Preferably, the porous medium is made of porous foam ceramic, the shell is made of ceramic fiber, and the constant pressure tank body is made of stainless steel.

[0015] Preferably, a plurality of temperature sensors are evenly arranged axially on the gas outlet channel, an emission monitor is arranged at the output end of the gas outlet channel, a flame monitor and a temperature sensor are arranged in the combustion chamber, and the temperature sensor, flame monitor and emission monitor are all electrically connected to the controller.

[0016] The working method of a porous medium burner based on a constant pressure tank to control a high gas flow rate comprises the following steps:

[0017] S1. Installation and commissioning;

[0018] S11, assembly: connect the porous medium burner body with the constant pressure tank body through the air inlet pipe, and arrange the pressure stabilizing component and the flow stabilizing component;

[0019] S12, pressure test: test the sealing and pressure resistance of the constant pressure tank to ensure that it can stably maintain the preset pressure;

[0020] S13, Calibration: Use standard flow meter to calibrate the steady flow component to ensure measurement and control accuracy;

[0021] S14, linkage debugging: simulate different working conditions and check the collaborative working ability of each component;

[0022] S2, start and run;

[0023] Fill the constant pressure tank body with gas and adjust it to the preset pressure, then start the pressure stabilizing component to allow the gas to enter the multi-media burner body at a set flow rate to ignite the fuel in the combustion chamber. During the combustion process, use temperature sensors, flame monitors and emission monitors to detect the local temperature, flame and exhaust gas in real time, and then adjust the flow regulating valve of the flow stabilizing component in real time according to the monitoring results, so as to adaptively adjust the flow rate of the gas entering the multi-media burner body.

[0024] The adaptive adjustment described in step S2 includes a temperature-based adaptive adjustment method and an emission-based adaptive adjustment method;

[0025] The temperature-based adaptive adjustment method specifically includes the following steps:

[0026] The first step is to use a temperature sensor to collect temperature data at multiple locations in the combustion chamber and perform preprocessing to obtain multiple actual temperature values;

[0027] Step 2: Deviation calculation: compare multiple actual temperature values ​​with the preset temperature uniform distribution target value to calculate the temperature deviation ΔT;

[0028] Step 3: Based on the improved algorithm of PID control, calculate the gas flow rate change ΔV and the constant pressure tank pressure change ΔP that need to be adjusted:

[0029]

[0030] ΔP=f(ΔV);

[0031] In the formula, K p , K i and K d Respectively represent the proportional coefficient, integral coefficient and differential coefficient; T irepresents the i-th actual temperature value; n represents the number of actual temperature values; ΔT prev Indicates the temperature deviation of the previous calculation; f(ΔV) indicates that the input is the change in gas flow rate and the output is the function of the change in constant pressure tank pressure;

[0032] Step 4: Determine the opening value k of the flow control valve based on the gas flow rate change ΔV and the constant pressure tank pressure change ΔP:

[0033]

[0034] Where ΔV i Indicates the change in the i-th gas flow rate; ΔV prev Indicates the change in gas flow rate calculated last time; γ indicates the adjustment coefficient;

[0035] The emission-based adaptive regulation method specifically includes the following steps:

[0036] The first step is to formulate the gas flow rate adjustment level and the opening value of the flow control valve based on the comprehensive emission excess multiple M;

[0037] The second step is to use the emission monitor to monitor multiple types of emission gases in real time and calculate the concentration C of each type of emission gas. j The environmental protection standard value S of the corresponding category j Compare and calculate the excess multiple M of each type of gas emissions j :

[0038]

[0039] Step 3: Calculate the comprehensive emission excess multiple M:

[0040] M=w 1 ×M 1 +…+w j ×M j ;

[0041] In the formula, w 1 …w j All are weight coefficients;

[0042] Step 4: Compare and determine the opening value of the flow control valve corresponding to the comprehensive emission excess multiple M.

[0043] Therefore, the present invention adopts the porous medium burner and working method based on the constant pressure tank to control the high flow rate of gas, which has the following beneficial effects:

[0044] 1. Accurately control high gas flow rate: Through the coordinated work of the constant pressure tank and the flow stabilization component, accurate control of high gas flow rate is achieved; specifically, the constant pressure tank is used to provide a stable pressure source, and the flow stabilization component is accurately adjusted according to real-time data to ensure that the gas flow rate is always within the preset range, avoid unstable combustion, and improve combustion reliability and repeatability;

[0045] 2. Improve combustion stability and efficiency: The stable high flow rate allows the fuel and air to be fully mixed in the porous medium, improving the combustion efficiency; at the same time, the flow rate can be adjusted in real time according to the working conditions to ensure flame stability, reduce flameout and flashback, and reduce energy consumption and operating costs;

[0046] 3. Improve temperature distribution uniformity: The combination of the layered structure of the porous medium and the stable gas flow rate under the control of the constant pressure tank makes the heat more evenly distributed in the burner, avoiding local overheating or overcooling, improving temperature uniformity, and helping to improve product quality and extend equipment life;

[0047] 4. Reduce pollutant emissions: Precisely controlled high flow rates and optimized combustion processes promote complete combustion of fuel, reduce the generation of incomplete combustion products (such as CO), and reduce emissions of pollutants such as nitrogen oxides (NOx), meeting environmental protection requirements and having good environmental benefits.

[0048] In summary, the porous medium burner described in the present invention has the advantages of high efficiency, stability, uniformity and environmental protection.

[0049] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic diagram of the overall structure of a porous medium burner based on a constant pressure tank to control high gas flow rate according to the present invention;

[0051] Figure 2 It is an axial cross-sectional view of a porous medium burner body of a porous medium burner based on a constant pressure tank to control a high gas flow rate according to the present invention;

[0052] Figure 3 This is a control block diagram of a porous medium burner based on a constant pressure tank to control high gas flow rate according to the present invention.

[0053] Reference numerals

[0054] 1. Constant pressure tank body; 2. Air outlet pipe; 3. Flow stabilization component; 4. Porous medium burner body; 41. Combustion chamber; 42. Bottom layer medium; 43. Middle layer medium; 44. Top layer medium; 45. Insulation layer; 46. Air outlet channel; 47. Circulating cooling channel; 5. Controller; 6. Emission monitor; 7. Gas mixer; 8. Temperature sensor. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not used to limit the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0056] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0057] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0058] like Figure 1-Figure 3 As shown, a porous medium burner based on a constant pressure tank to control high gas flow rate includes a constant pressure tank body 1 and a porous medium burner body 4. A buffer chamber is arranged in the constant pressure tank body 1, and a pressure stabilizing component is arranged inside the buffer chamber. The air inlet end of the buffer chamber is connected with the gas mixer 7 through a gas filter. The gas filter can effectively filter out impurities and particulate matter in the gas to prevent them from entering the constant pressure tank and subsequent burner systems, avoid clogging or damage to valves, pipelines, porous media and other components, and ensure the normal operation and long-term stability of the system. The air outlet end of the buffer chamber is connected with the air inlet end of the porous medium burner body 4 through an air outlet pipe 2, and a flow stabilizing component 3 is arranged on the air outlet pipe 2.

[0059] The air outlet pipe in this embodiment adopts a variable diameter pipe designed as follows:

[0060] 1. Pipe diameter calculation based on fluid mechanics model: Use CFD software to simulate gas flow, and calculate the pipe diameter using the Darcy-Weisbach formula based on the input gas physical properties (density, viscosity), flow range, porous medium burner working pressure and other parameters, combined with the Reynolds number (Re) and the drag coefficient along the way (λ):

[0061]

[0062] In the formula, h fHead loss along the way, L is the length of the pipeline, d is the pipe diameter, v is the flow velocity, and g is the gravitational acceleration;

[0063] After multiple iterations of calculation, the optimal pipe diameter is obtained.

[0064] 2. Variable diameter pipeline design: According to the gas flow characteristics, a larger pipe diameter is used at the end close to the constant pressure tank to reduce the flow velocity and pressure loss; the pipe diameter is reduced at the end close to the porous medium burner to maintain a high flow velocity, and the length and the slope of the variable diameter are determined by CFD simulation to ensure smooth airflow.

[0065] 3. Pipe diameter redundancy design considering flow rate changes: Consider the gas flow rate changes when the porous medium burner is working, and take the normal working flow rate Q n As a benchmark, multiply it by the flow fluctuation coefficient k (1.2-1.5) to get the maximum flow Q max =kQ n , combined with this as a constraint condition to calculate the pipe diameter, so as to meet the high flow rate requirements when the flow fluctuates.

[0066] At the same time, the outlet pipe in this embodiment adopts the following inner wall treatment:

[0067] 1. Ultra-precision machining: Use electrolytic polishing or chemical mechanical polishing to reduce the roughness of the inner wall of the pipeline to the nanometer level and reduce the gas flow resistance;

[0068] 2. Chemical cleaning: Soak the pipe in ethanol or sodium hydroxide to remove oil, rust and other impurities on the inner wall to improve the cleanliness and flatness of the inner wall. After cleaning, rinse with clean water and dry.

[0069] 3. Apply anti-rust paint: Evenly apply anti-rust paint on the inner wall of the pipe, which can not only prevent the pipe from rusting and corrosion, but also make the inner wall surface smoother to a certain extent and reduce gas flow resistance.

[0070] Among them, the pressure stabilizing component includes a pressure sensor and a pressure regulating valve. The pressure sensor is electrically connected to the input end of the controller 5, and the output end of the controller 5 is electrically connected to the pressure regulating valve, which is used to adjust the opening of the pressure regulating valve according to the result of comparing the internal pressure of the buffer chamber collected by the pressure sensor with the preset pressure range, so as to control the internal pressure of the buffer chamber within the preset pressure range, so that the gas pressure in the constant pressure tank remains stable, thereby providing a gas source with stable pressure for the porous medium burner body 4, thereby ensuring the stability of the high gas flow rate. For example, when it is detected that the gas flow rate is lower than the preset value, the controller 5 increases the opening of the flow regulating valve to allow more gas to enter the porous medium burner, thereby increasing the flow rate; conversely, when the flow rate is too high, the regulating valve opening is reduced to reduce the flow rate. Through this closed-loop control method, accurate and stable control of the high gas flow rate is achieved, ensuring that the porous medium burner operates under optimal conditions.

[0071] The flow stabilizing component 3 includes a flow regulating valve and a flow velocity sensor which are sequentially arranged on the air intake pipe. The flow velocity sensor is electrically connected to the input end of the controller 5, and the output end of the controller 5 is electrically connected to the flow regulating valve. It is used to adjust the opening of the flow regulating valve according to the result of comparing the input flow velocity of the porous medium burner body 4 collected by the flow velocity sensor with the preset flow velocity range, so as to control the input flow velocity of the porous medium burner body 4 within the preset flow velocity range.

[0072] The porous medium burner body 4 includes an outer shell, a combustion chamber 41 and an air outlet channel 46 opened inside the outer shell, and a porous medium filled between the combustion chamber 41 and the air outlet channel 46. The porous medium is a layered structure, and the porous medium includes a bottom layer medium 42, a middle layer medium 43 and a top layer medium 44 arranged in sequence from the combustion chamber 41 to the air outlet channel 46, and the pore size and porosity of the bottom layer medium 42, the middle layer medium 43 and the top layer medium 44 are reduced in sequence. The above-mentioned structural arrangement can facilitate the rapid and uniform diffusion of gas into the combustion area, stabilize the flame and promote the combustion reaction, and ensure complete combustion and reduce heat loss.

[0073] A heat insulating layer 45 is provided on the inner wall of the outer shell, which can effectively reduce the heat loss to the outer shell of the porous medium burner and improve the combustion efficiency. A circulating cooling channel 47 is provided on the outer wall of the outer shell. The circulating cooling channel 47 is filled with a cooling medium. The cooling medium is cooling water or cooling air. It is used to take away excess heat from the wall of the combustion chamber 41 to prevent the wall temperature from being too high, thereby ensuring the safe operation and long-term stability of the porous medium burner, and also helping to maintain the uniformity of the temperature in the combustion chamber 41.

[0074] The porous medium is made of porous foam ceramic, the shell is made of ceramic fiber, and the constant pressure tank body 1 is made of stainless steel to ensure stable and reliable operation in a high temperature and high pressure gas environment.

[0075] A plurality of temperature sensors 8 are evenly arranged axially on the gas outlet channel 46 , an emission monitor 6 is arranged at the output end of the gas outlet channel 46 , a flame monitor and a temperature sensor are arranged in the combustion chamber 41 , and the temperature sensor 8 , the flame monitor and the emission monitor 6 are all electrically connected to the controller 5 .

[0076] It should be noted that the above-mentioned electronic components are mature products on the market. This embodiment only needs to purchase them and connect them according to the instructions. No improvement is made to their circuit connection structure and principle, so their circuit connection structure and principle will not be repeated here.

[0077] The working method of a porous medium burner based on a constant pressure tank to control a high gas flow rate comprises the following steps:

[0078] S1. Installation and commissioning;

[0079] S11, assembly: connect the porous medium burner body 4 with the constant pressure tank body 1 through the air inlet pipe, and arrange the pressure stabilizing component and the flow stabilizing component;

[0080] S12, pressure test: testing the sealing and pressure resistance of the constant pressure tank body 1 to ensure that it can stably maintain the preset pressure;

[0081] S13, calibration: use a standard flow meter to calibrate the flow stabilization component 3 to ensure measurement and control accuracy;

[0082] S14, linkage debugging: simulate different working conditions and check the collaborative working ability of each component;

[0083] S2, start and run;

[0084] Gas is filled into the constant pressure tank body 1 and adjusted to a preset pressure, and the pressure stabilizing component is started to allow the gas to enter the multi-media burner body at a set flow rate to ignite the fuel in the combustion chamber 41. During the combustion process, the local temperature, flame (flame stability, shape and position) and exhaust gas (such as nitrogen oxides and carbon monoxide) are detected in real time with the help of the temperature sensor 8, flame monitor and emission monitor 6. The flow regulating valve of the flow stabilizing component 3 is adjusted in real time according to the monitoring results, thereby adaptively adjusting the flow rate of the gas entering the multi-media burner body.

[0085] The adaptive adjustment described in step S2 includes a temperature-based adaptive adjustment method and an emission-based adaptive adjustment method;

[0086] The temperature-based adaptive adjustment method specifically includes the following steps:

[0087] The first step is to use the temperature sensor to collect temperature data at multiple locations in the combustion chamber, and perform preprocessing (convert the analog quantity into the actual temperature value through the S_ITR instruction, and perform filtering to remove noise interference. For example, a sliding average filtering algorithm is used, the window size is set to n, and the average value of n consecutive temperature data is calculated as the current effective temperature value) to obtain multiple actual temperature values;

[0088] Step 2: Deviation calculation: compare multiple actual temperature values ​​with the preset temperature uniform distribution target value to calculate the temperature deviation ΔT;

[0089] Step 3: Based on the improved algorithm of PID control, calculate the gas flow rate change ΔV and the constant pressure tank pressure change ΔP that need to be adjusted:

[0090]

[0091] ΔP=f(ΔV);

[0092] In the formula, K p , K i and K d Respectively represent the proportional coefficient, integral coefficient and differential coefficient; T i represents the i-th actual temperature value; n represents the number of actual temperature values; ΔT prev represents the temperature deviation of the previous calculation; f(ΔV) represents a function whose input is the change in gas flow rate and whose output is the change in pressure of the constant pressure tank, which is obtained through fitting experiments;

[0093] Step 4: Determine the opening value k of the flow control valve based on the gas flow rate change ΔV and the constant pressure tank pressure change ΔP:

[0094]

[0095] Where ΔV i Indicates the change in the i-th gas flow rate; ΔV prev Indicates the change in gas flow rate calculated last time; γ indicates the adjustment coefficient;

[0096] The emission-based adaptive regulation method specifically includes the following steps:

[0097] The first step is to formulate the gas flow rate adjustment level and the opening value of the flow control valve based on the comprehensive emission excess multiple M;

[0098] The second step is to use emission monitors to monitor multiple types of emission gases in real time, such as nitrogen oxides (NOx) and carbon monoxide (CO), and calculate the concentration C of each type of emission gas. j The environmental protection standard value S of the corresponding category j Compare and calculate the excess multiple M of each type of gas emissions j :

[0099]

[0100] Step 3: Calculate the comprehensive emission excess multiple M:

[0101] M=w 1 ×M 1 +…+w j ×M j ;

[0102] In the formula, w 1 …w j All are weight coefficients;

[0103] Step 4: Compare and determine the opening value of the flow control valve corresponding to the comprehensive emission excess multiple M.

[0104] In this embodiment, after running for a period of time, the following repairs and maintenance are required:

[0105] Regularly maintain the constant pressure tank and check the working conditions of the buffer chamber, pressure stabilizing components and gas filters in the tank. Clean the impurities and dust in the gas filter to ensure the purity of the gas; check the accuracy and reliability of the pressure regulating valve and pressure sensor, and calibrate or replace them if necessary. Regularly maintain the flow regulating valve and flow velocity sensor of the flow stabilizing component, check the sealing and flexibility of the valve, and calibrate the measurement accuracy of the flow velocity sensor. Check the porous medium of the porous medium burner to see if there is any blockage, sintering or damage. If necessary, replace some of the porous media in time. At the same time, check and maintain the insulation layer, cooling channel and combustion chamber wall of the burner to ensure good insulation and cooling effects. Regularly check and maintain the sensors, controllers and actuators of the operation monitoring and adaptive adjustment system, update the control software and algorithms, and ensure that the monitoring and control functions of the system are accurate and reliable. Through regular maintenance, the service life of the entire burner system can be extended to ensure its long-term stable and efficient operation.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A porous medium burner based on a constant pressure tank to control high gas flow rate, comprising a constant pressure tank body and a porous medium burner body, characterized in that: A buffer chamber is provided in the constant pressure tank body, and a pressure stabilizing component is provided inside the buffer chamber. The air inlet end of the buffer chamber is connected with the gas mixer through a gas filter, and the air outlet end of the buffer chamber is connected with the air inlet end of the porous medium burner body through an air outlet pipe, and a flow stabilizing component is provided on the air outlet pipe.

2. The porous medium burner based on a constant pressure tank to control high gas flow rate according to claim 1, characterized in that: The pressure stabilizing component includes a pressure sensor and a pressure regulating valve. The pressure sensor is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the pressure regulating valve. It is used to adjust the opening of the pressure regulating valve according to the result of comparing the internal pressure of the buffer chamber collected by the pressure sensor with the preset pressure range, so as to control the internal pressure of the buffer chamber within the preset pressure range.

3. The porous medium burner based on a constant pressure tank to control high gas flow rate according to claim 2, characterized in that: The flow stabilization component includes a flow regulating valve and a flow velocity sensor which are sequentially arranged on the air intake pipe. The flow velocity sensor is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the flow regulating valve. It is used to adjust the opening of the flow regulating valve according to the result of comparing the input flow velocity of the porous medium burner body collected by the flow velocity sensor with the preset flow velocity range, so as to control the input flow velocity of the porous medium burner body within the preset flow velocity range.

4. The porous medium burner based on a constant pressure tank to control high gas flow rate according to claim 3 is characterized in that: The porous medium burner body includes an outer shell, a combustion chamber and an air outlet channel opened inside the outer shell, and a porous medium filled between the combustion chamber and the air outlet channel. The porous medium is a layered structure, and the porous medium includes a bottom layer medium, a middle layer medium and a top layer medium arranged in sequence from the combustion chamber to the air outlet channel, and the pore size and porosity of the bottom layer medium, the middle layer medium and the top layer medium decrease in sequence.

5. The porous medium burner based on a constant pressure tank to control high gas flow rate according to claim 4, characterized in that: A heat insulating layer is arranged on the inner wall of the shell, and a circulating cooling channel is arranged on the outer wall of the shell. The circulating cooling channel is filled with a cooling medium, and the cooling medium is cooling water or cooling air.

6. The porous medium burner based on a constant pressure tank to control high gas flow rate according to claim 5, characterized in that: The porous medium is made of porous foam ceramic, the outer shell is made of ceramic fiber, and the constant pressure tank body is made of stainless steel.

7. The porous medium burner based on a constant pressure tank to control high gas flow rate according to claim 4, characterized in that: A plurality of temperature sensors are evenly arranged axially on the gas outlet channel, an emission monitor is arranged at the output end of the gas outlet channel, a flame monitor and a temperature sensor are arranged in the combustion chamber, and the temperature sensor, the flame monitor and the emission monitor are all electrically connected to the controller.

8. The method for operating a porous medium burner based on a constant pressure tank to control a high gas flow rate according to any one of claims 4 to 7, characterized in that: The following steps are involved: S1. Installation and commissioning; S11, assembly: connect the porous medium burner body with the constant pressure tank body through the air inlet pipe, and arrange the pressure stabilizing component and the flow stabilizing component; S12, pressure test: test the sealing and pressure resistance of the constant pressure tank to ensure that it can stably maintain the preset pressure; S13, Calibration: Use standard flow meter to calibrate the steady flow component to ensure measurement and control accuracy; S14, linkage debugging: simulate different working conditions and check the collaborative working ability of each component; S2, start and run; Fill the constant pressure tank body with gas and adjust it to the preset pressure, then start the pressure stabilizing component to allow the gas to enter the multi-media burner body at a set flow rate to ignite the fuel in the combustion chamber. During the combustion process, use temperature sensors, flame monitors and emission monitors to detect the local temperature, flame and exhaust gas in real time, and then adjust the flow regulating valve of the flow stabilizing component in real time according to the monitoring results, so as to adaptively adjust the flow rate of the gas entering the multi-media burner body.

9. The working method of a porous medium burner based on a constant pressure tank to control a high gas flow rate according to claim 8, characterized in that: The adaptive adjustment described in step S2 includes a temperature-based adaptive adjustment method and an emission-based adaptive adjustment method; The temperature-based adaptive adjustment method specifically includes the following steps: The first step is to use a temperature sensor to collect temperature data at multiple locations in the combustion chamber and perform preprocessing to obtain multiple actual temperature values; Step 2: Deviation calculation: compare multiple actual temperature values ​​with the preset temperature uniform distribution target value to calculate the temperature deviation ΔT; Step 3: Based on the improved algorithm of PID control, calculate the gas flow rate change ΔV and the constant pressure tank pressure change ΔP that need to be adjusted: ΔP=f(ΔV); In the formula, K p , K i and K d Respectively represent the proportional coefficient, integral coefficient and differential coefficient; T i represents the i-th actual temperature value; n represents the number of actual temperature values; ΔT prev Indicates the temperature deviation of the previous calculation; f(ΔV) indicates that the input is the change in gas flow rate and the output is the function of the change in constant pressure tank pressure; Step 4: Determine the opening value k of the flow control valve based on the gas flow rate change ΔV and the constant pressure tank pressure change ΔP: Where, ΔV i Indicates the change in the i-th gas flow rate; ΔV prev Indicates the change in gas flow rate calculated last time; γ indicates the adjustment coefficient; The emission-based adaptive regulation method specifically includes the following steps: The first step is to formulate the gas flow rate adjustment level and the opening value of the flow control valve based on the comprehensive emission excess multiple M; The second step is to use the emission monitor to monitor multiple types of emission gases in real time and calculate the concentration C of each type of emission gas. j The environmental protection standard value S of the corresponding category j Compare and calculate the excess multiple M of each type of gas emissions j : Step 3: Calculate the comprehensive emission excess multiple M: M=w1×M1+…+w j ×M j ; Where w1…w j All are weight coefficients; Step 4: Compare and determine the opening value of the flow control valve corresponding to the comprehensive emission excess multiple M.

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