ammonia coal burner

Abstract

This utility model relates to an ammonia-coal burner, comprising: a main shell of the burner, with a coal pulverizer and primary air supply pipe on one side of the main shell for supplying coal pulverizer and primary air; a mixing chamber and a combustion chamber within the main shell, the coal pulverizer and primary air supply pipe being sequentially connected to the mixing chamber and the combustion chamber; an ammonia gas inlet mechanism, with multiple first cyclone ducts disposed on the main shell corresponding to the mixing chamber, the ammonia gas inlet mechanism being connected to the mixing chamber through the first cyclone ducts and forming a cyclone airflow within the mixing chamber; and a secondary air inlet mechanism, with multiple second cyclone ducts disposed on the main shell corresponding to the combustion chamber next to the mixing chamber, the secondary air inlet mechanism being connected to the combustion chamber through the second cyclone ducts and forming a cyclone airflow in the combustion chamber in the opposite direction to that in the mixing chamber. This application aims to improve upon traditional coal pulverizers by enabling them to perform ammonia-coal co-combustion.

Description

Technical Field

[0001] This utility model relates to the field of ammonia-coal combustion equipment, and in particular to an ammonia-coal burner. Background Technology

[0002] Against the backdrop of a global push for clean energy transition and energy conservation and emission reduction, ammonia, as a zero-carbon fuel, has broad application prospects. Blending ammonia with traditional coal can effectively reduce pollutant emissions and contribute to achieving carbon neutrality. However, the pulverized coal burners widely used in the market are primarily designed and operate based on the combustion characteristics of pulverized coal alone, aiming to meet the demands for stable ignition and efficient combustion. Ammonia and pulverized coal differ significantly in fuel form, combustion characteristics, and chemical reaction mechanisms; for example, ammonia has a higher ignition temperature, slower combustion rate, and unique combustion products. Therefore, directly using existing pulverized coal burners for ammonia-coal co-combustion makes it difficult to achieve uniform mixing, stable ignition, and complete combustion of the two fuels, easily leading to problems such as low combustion efficiency, unstable flames, and excessive pollutant emissions.

[0003] Currently, although the research and application of ammonia-coal co-combustion technology are gradually attracting attention, there is still a lack of effective solutions in the market for improving traditional pulverized coal burners into ammonia-coal burners. Summary of the Invention

[0004] The purpose of this utility model is to solve the above-mentioned technical problems and provide an ammonia-coal burner. This application is to improve the traditional pulverized coal burner so that it has the function of ammonia-coal co-combustion.

[0005] Ammonia-coal burner includes: a main shell of the burner, with a coal powder and primary air conveying pipe on one side of the main shell for supplying coal powder and primary air; a mixing chamber and a combustion chamber are also provided inside the main shell, and the coal powder conveying pipe is connected to the mixing chamber and the combustion chamber in sequence; an ammonia gas inlet mechanism, with multiple first cyclone air pipes provided on the main shell corresponding to the mixing chamber, the ammonia gas inlet mechanism being connected to the mixing chamber through the first cyclone air pipes and forming a cyclone airflow in the mixing chamber; and a secondary air inlet mechanism, with multiple second cyclone air pipes provided on the main shell corresponding to the combustion chamber next to the mixing chamber, the secondary air inlet mechanism being connected to the combustion chamber through the second cyclone air pipes and forming a cyclone airflow in the combustion chamber in the opposite direction to that in the mixing chamber.

[0006] According to the ammonia-coal burner of this application, a simple modification can be made to the existing pulverized coal burner to enable the burner to have the function of ammonia-coal co-combustion, so as to achieve efficient mixing and combustion of ammonia and coal and reduce carbon emissions. Specifically, an ammonia air inlet mechanism and a secondary air inlet mechanism are added to the outside of the main shell of the existing burner. After the pulverized coal and primary air are mixed and sent into the air-coal conveying pipe, they will first be fully mixed with the ammonia forming a cyclone airflow, and then enter the reverse cyclone airflow formed by the secondary air for further full mixing and ignition. In this way, a stable and efficient combustion environment is formed in the combustion chamber, ensuring efficient energy release and pollutant control.

[0007] Furthermore, the ammonia gas inlet mechanism includes an ammonia gas inlet shell, an ammonia gas flow regulation module, an ammonia gas inlet pipe, and an ammonia gas pump. The ammonia gas inlet shell is fixed outside the mixing chamber at the first cyclone duct to form an ammonia gas inlet chamber. The ammonia gas inlet pipe connects the ammonia gas inlet chamber and the ammonia gas pump. The ammonia gas flow regulation module is installed on the ammonia gas inlet pipe to regulate the ammonia gas intake. The ammonia gas pump pressurizes the ammonia gas, creating a cyclone airflow in the mixing chamber. The ammonia gas inlet mechanism has a simple structure and can be used to improve existing pulverized coal burners to form ammonia-coal burners at a relatively low cost.

[0008] Furthermore, the ammonia flow rate regulation module includes a first servo motor, a first valve body, and a first baffle. One end of the first baffle is rotatably mounted inside the first valve body, and the other end of the first baffle extends out of the first valve body and is driven by the first servo motor. The intake volume of ammonia can be easily adjusted by regulating the rotation angle of the first baffle (i.e., the opening degree of the first baffle). The first servo motor drives the first baffle, and since the first servo motor has a built-in encoder, the rotation angle data of the first baffle can be obtained through the encoder, thus facilitating subsequent control of the rotation angle data of the first baffle.

[0009] Furthermore, the secondary air intake mechanism includes a secondary air intake shell, a secondary air flow rate adjustment module, a secondary air intake pipe, and a secondary air pump. The secondary air intake shell is fixed outside the combustion chamber at the second cyclone duct to form a secondary air intake chamber. The secondary air intake pipe connects the secondary air intake chamber and the secondary air pump. The secondary air flow rate adjustment module is installed on the secondary air intake pipe to adjust the intake volume of the secondary air. The secondary air pump pressurizes the secondary air, creating a cyclone airflow within the combustion chamber. The secondary air intake mechanism has a simple structure and can be used to improve existing pulverized coal burners into ammonia-coal burners at a relatively low cost.

[0010] Furthermore, the secondary airflow regulation module includes a second servo motor, a second valve body, and a second baffle. One end of the second baffle is rotatably mounted inside the second valve body, and the other end extends out of the second valve body and is connected to the second servo motor for transmission. The intake air volume of the secondary airflow can be easily adjusted by regulating the rotation angle of the second baffle (i.e., the opening degree of the second baffle). The second servo motor drives the second baffle, and since it has a built-in encoder, the rotation angle data of the second baffle can be obtained through the encoder, facilitating subsequent control of the second baffle's rotation angle. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of the ammonia-coal burner of this utility model.

[0012] Figure 2 This is a perspective view of the ammonia-coal burner of this utility model.

[0013] Figure 3 This is a cross-sectional view of the mixing chamber of the ammonia-coal burner of this utility model.

[0014] Figure 4 This is a cross-sectional view of the combustion chamber of the ammonia-coal burner of this utility model.

[0015] Figure 5 This is a line graph showing the experimental data for the mass ratio of pulverized coal to ammonia in the ammonia-coal burner of this utility model, which is 9:1.

[0016] Figure 6 This is a line graph showing the experimental data for the mass ratio of pulverized coal to ammonia in the ammonia-coal burner of this utility model, which is 8:2.

[0017] Figure 7 This is a line graph showing the experimental data for the mass ratio of pulverized coal to ammonia in the ammonia-coal burner of this invention, which is 7:3.

[0018] Figure 8 This is a line graph showing the experimental data for the mass ratio of pulverized coal to ammonia in the ammonia-coal burner of this utility model, which is 5:5.

[0019] Figure 9 This is a flowchart of the control system for the ammonia-coal burner of this utility model.

[0020] Figure 10 The flowchart of the cloud platform of this utility model dynamically adjusting PID parameters using AI is shown.

[0021] Figure 11 The cloud platform of this utility model uses a multivariable decoupling control flowchart.

[0022] Figure 12 This utility model presents a flowchart of the cloud platform's AI-based dynamic parameter tuning strategy. Detailed Implementation

[0023] The present invention relates to an ammonia-coal burner, illustrated in conjunction with the accompanying drawings.

[0024] Example 1

[0025] like Figures 1 to 4 The ammonia-coal burner shown includes: a main shell 1 of the burner, with a coal powder and primary air supply pipe 11 on one side of the main shell 1; a mixing chamber 12 and a combustion chamber 13 are also provided inside the main shell 1, and the coal powder supply pipe 11 is connected to the mixing chamber 12 and the combustion chamber 13 in sequence; and an ammonia gas inlet mechanism 2, with a plurality of first cyclone air pipes 25 provided on the main shell 1 corresponding to the mixing chamber 12. The ammonia gas inlet mechanism 2 is connected to the mixing chamber 12 through the first cyclone air pipes 25, and forms a cyclone airflow in the mixing chamber 12. The secondary air intake mechanism 3, corresponding to the main shell 1 of the combustion chamber 13 next to the mixing chamber 12, is provided with multiple second cyclone air ducts 35. The secondary air intake mechanism 3 is connected to the combustion chamber 13 through the second cyclone air ducts 35, forming a cyclone airflow in the combustion chamber 13 that is opposite to that in the mixing chamber 12. Existing pulverized coal burners generally mix pulverized coal and air through the air-coal conveying pipe 11 and send it into the combustion chamber 13 for ignition by an ignition device. When improving the existing pulverized coal burner, a mixing chamber 12 is added between the air-coal conveying pipe 11 and the ignition device, such as... Figure 3 As shown, multiple holes are then made on the main shell 1 of the mixing chamber 12 for welding and fixing the first cyclone duct 25. Ammonia gas will eventually be blown into the mixing chamber 12 through the first cyclone duct 25, so that a cyclone airflow is formed in the mixing chamber 12. When the pulverized coal and primary air are blown into the mixing chamber 12, the pulverized coal, ammonia gas and primary air can be fully mixed. Since the primary air of the original burner is configured according to the amount of pulverized coal, the amount of oxygen in the primary air is insufficient to support the full combustion of pulverized coal and ammonia gas. In order to enable the mixed gas with added ammonia gas to burn fully, this application sets a secondary air inlet mechanism 3 next to the mixing chamber 12, such as Figure 4 As shown, multiple holes are also made on the main shell 1 for welding and fixing the second cyclone duct 35. Preferably, the second cyclone duct 35 is set in the same place as the original ignition device of the burner. The secondary air will eventually be blown into the combustion chamber 13 through the second cyclone duct 35, so that a cyclone airflow opposite to that in the mixing chamber 12 can be formed in the burner, which completely breaks the laminar boundary layer, increases the diffusion speed of ammonia molecules, and allows ammonia and coal powder to be mixed more fully. This allows the original ignition device of the burner to still be able to quickly ignite the mixed gas with ammonia, while providing sufficient oxygen for the combustion of ammonia and coal powder. This enables the ammonia-coal burner to achieve "high efficiency, low nitrogen, and stable" combustion, reducing carbon emissions and the generation of nitrogen oxides.

[0026] like Figure 1 and Figure 2 As shown, the ammonia inlet mechanism 2 includes an ammonia inlet shell 24, an ammonia flow rate regulating module 22, an ammonia inlet pipe 21, and an ammonia pump 23. The ammonia inlet shell 24 is fixed outside the mixing chamber 12 at the first cyclone pipe 25 to form an ammonia inlet chamber 241. The ammonia inlet pipe 21 connects the ammonia inlet chamber 241 and the ammonia pump 23. The ammonia flow rate regulating module 22 is installed on the ammonia inlet pipe 21 to regulate the ammonia intake volume. The ammonia pump 23 pressurizes the ammonia to form a cyclone airflow in the mixing chamber 12. The ammonia inlet shell 24 is welded and fixed to the main shell 1, and an ammonia inlet chamber 241 connecting the first cyclone pipe 25 is formed between the ammonia inlet shell 24 and the main shell 1.

[0027] The ammonia flow rate regulating module 22 includes a first servo motor 221, a first valve body, and a first baffle 222. The first valve body is connected to the ammonia inlet pipe 21. One end of the first baffle 222 is rotatably disposed within the first valve body, and the other end of the first baffle 222 extends out of the first valve body and is connected to the first servo motor 221 for transmission. Figure 1 As shown, the first baffle 222 and the first servo motor 221 are connected by a first gear train 223. The intake of ammonia can be easily adjusted by adjusting the rotation angle of the first baffle 222 (i.e., the opening degree of the first baffle 222). The first baffle 222 is driven by the first servo motor 221. Since the first servo motor 221 has a built-in encoder, the rotation angle data of the first baffle 222 can be obtained through the encoder, which facilitates subsequent control of the rotation angle data of the first baffle 222.

[0028] like Figure 1 and Figure 2 As shown, the secondary air intake mechanism 3 includes a secondary air intake shell 34, a secondary air flow rate adjustment module 32, a secondary air intake pipe 31, and a secondary air pump 33. The secondary air intake shell 34 is fixed outside the combustion chamber 13 at the second cyclone pipe 35 to form a secondary air intake chamber 341. The secondary air intake pipe 31 connects the secondary air intake chamber 341 and the secondary air pump 33. The secondary air flow rate adjustment module 32 is installed on the secondary air intake pipe 31 to adjust the intake volume of the secondary air. The secondary air pump 33 pressurizes the secondary air to form a cyclone airflow in the combustion chamber 13.

[0029] The secondary airflow regulation module 32 includes a second servo motor 321, a second valve body, and a second baffle 322. The second valve body is connected to the secondary air inlet pipe 31. One end of the second baffle 322 is rotatably disposed within the second valve body, and the other end of the second baffle 322 extends out of the second valve body and is connected to the second servo motor 321 for transmission. Figure 1As shown, the second baffle 322 and the second servo motor 321 are connected by a second gear train 323. The intake air volume of the secondary air can be easily adjusted by adjusting the rotation angle of the second baffle 322 (i.e., the opening degree of the second baffle 322). The second baffle 322 is driven by the second servo motor 321. Since the second servo motor 321 has a built-in encoder, the rotation angle data of the second baffle 322 can be obtained through the encoder, which facilitates subsequent control of the rotation angle data of the second baffle 322.

[0030] like Figure 1 and Figure 2 As shown, it also includes a base bracket 14, on which the main housing 1 is supported and fixed. The base bracket 14 also has side plates extending to both sides, which provide support and installation positions for the newly added ammonia air inlet mechanism 2 and secondary air inlet mechanism 3.

[0031] Example 2

[0032] like Figures 5 to 8 As shown, multiple experiments were conducted on the mixing ratio of pulverized coal and ammonia in the ammonia-coal burner of Example 1. In the attached figure, the horizontal axis of the line graph represents the distance from the initial measurement point, and the vertical axis, from left to right and from top to bottom, represents the temperature, NO emission mass fraction, CO2 emission mass fraction, and CO emission mass fraction, respectively.

[0033] The first group is as follows Figure 5 As shown, the mass ratio of pulverized coal to ammonia was 9:1. The experimental data are shown in the table below:

[0034]

[0035] The second group is as follows Figure 6 As shown, the mass ratio of pulverized coal to ammonia was 8:2. The experimental data are shown in the table below:

[0036]

[0037] The third group is as follows Figure 7 As shown, the mass ratio of pulverized coal to ammonia was 7:3. The experimental data are shown in the table below:

[0038]

[0039] Group 4 Figure 8 As shown, the mass ratio of pulverized coal to ammonia was 5:5, and the experimental data are shown in the table below:

[0040]

[0041] Based on experimental data, it can be seen that among the above ratios, a coal powder to ammonia mass ratio of 8:2 is the optimal choice, for the following reasons:

[0042] Based on the converted nitrogen oxide emission density data, it can be seen that the second group is much lower than the other three groups.

[0043] The second group also had the lowest carbon dioxide emissions among the four groups, resulting in a smaller impact on the environment.

[0044] Because nitrogen oxide emissions are minimal, the exhaust gas is more likely to meet national emission standards after being treated by a gas absorption tower.

[0045] The second group does not produce other harmful gases, and the combustion process is more stable compared to other cases.

[0046] Example 3

[0047] like Figure 9 As shown, a control system for the aforementioned ammonia-coal burner is described. Due to improvements in the burner's structure, existing burner control systems are no longer sufficient to regulate the burner's internal temperature. Therefore, a new control system and method are needed to control the ammonia-coal burner. The control system includes a temperature sensor, a flow sensor, and an encoder. The temperature sensor monitors the temperature of the combustion chamber. The flow sensor monitors the flow rates of the air-coal delivery pipe, the ammonia inlet mechanism, and the secondary air inlet mechanism. The encoder monitors the angle of the baffles within the air-coal delivery pipe, the ammonia inlet mechanism, and the secondary air inlet mechanism. The system consists of: a PLC (Power Controller), a control system, and a microcontroller. The PLC generates a control signal based on the sensor data and transmits the control strategy to the PLC. If the control strategy is to adjust the baffle angle, the PLC transmits the control signal to the microcontroller, which then uses a PID control algorithm to adjust the baffle angle of the monitoring air-powder conveying pipe, ammonia inlet mechanism, or secondary air inlet mechanism. The PLC controls the air pump based on the control signal generated by the control strategy if the control strategy is to adjust the air pump. The actuator is used to adjust the baffle angle of the air-powder conveying pipe, ammonia inlet mechanism, or secondary air inlet mechanism.

[0048] The actuator includes a servo motor, the encoder is disposed inside the servo motor, and the servo motor is connected to the baffle for transmission.

[0049] It also includes a cloud platform for acquiring historical and real-time sensor data in the background to optimize PID parameters, which are then transmitted to the microcontroller via a PLC.

[0050] A control method for a control system using the aforementioned ammonia-coal burner includes the following steps: acquiring sensor data through sensors and transmitting it to a PLC; generating a control strategy based on the sensor data; if the control strategy is to adjust the baffle angle, the PLC transmits the control signal generated according to the control strategy to a microcontroller, and the microcontroller adjusts the baffle angle of the monitoring air-coal conveying pipe, ammonia inlet mechanism, or secondary air inlet mechanism based on a PID control algorithm; if the control strategy is to adjust the air pump, the PLC controls the air pump according to the control signal generated according to the control strategy.

[0051] The temperature sensor is a wireless temperature sensor that communicates with the PLC via a built-in WIFI module. Ideally, multiple temperature sensors are evenly distributed on the main housing to more accurately acquire temperature data within the burner. At least three flow sensors are installed, located in the air-coal delivery pipe, ammonia inlet pipe, and secondary air inlet pipe, respectively, to monitor the flow rate in these three areas. The flow sensors communicate directly with the PLC via cables. The microcontroller is a microcontroller with a built-in PID algorithm chip, facilitating subsequent calculation of control signals based on PID parameters. The system is equipped with a PC for manual monitoring of data and adjustment of the burner. The cloud platform is deployed on a commercial company's cloud ECS server and uses an LSTM neural network model. It is trained using laboratory simulation data (covering 0-100% load) and historical field operation data. The subsequent input is time-series data of temperature, flow rate, and baffle angle (time window of 60 seconds). It can output optimized PID parameters Kp, Ki, and Kd. If the temperature and flow rate are strongly coupled, the cloud platform can also provide feedforward compensation or decoupling strategies to decouple temperature and flow control into independent loops, assisting the PID in achieving multi-objective control.

[0052] The following is a PID control process using the baffle angle of the ammonia gas inlet mechanism as an example;

[0053] Control objective:

[0054] Temperature control target: Stabilize the combustion chamber temperature at 800℃ (set value).

[0055] Flow control objective: Adjust the ammonia flow rate to match combustion requirements, such as matching 10 m³ / min at 800℃.

[0056] The combustion chamber temperature is monitored in real time by a temperature sensor, and the current temperature is measured to be 790℃. The ammonia gas flow rate of the ammonia inlet mechanism is measured to be 9.5 m³ / min by a flow sensor. The encoder of the servo motor detects that the rotation angle of the baffle (i.e., the gear lever opening) is 45°. After receiving this sensor data, the PLC uploads it to the backend. The backend analyzes the data and generates a strategy to adjust the baffle of the ammonia gas inlet mechanism. The PLC generates a control signal according to the control strategy. After receiving the control signal, the microcontroller starts calculation based on the PID parameters. The calculation process is as follows:

[0057] Initial state:

[0058]

[0059] Error calculation:

[0060] Temperature error .

[0061] Flow error .

[0062] PID calculation:

[0063] The cloud platform optimizes PID parameters. PID parameters: .

[0064] PID output calculation (discretization formula with period T of 1s):

[0065] Proportional term (P): 2.0 × 0.5 = 1.0 2.0 × 0.5 = 1.0

[0066] Integral term (I) (assuming historical error accumulation = 2): 0.5 × 2 × 1 = 1.0.

[0067] Differential term (D) (assuming the error at the previous time step = 0.3): 1.0 × (0.5 - 0.3) / 1 = 0.21.

[0068] Control the total amount:

[0069] .

[0070] (Unit: percentage, e.g., 2.2% opening increment).

[0071] Execution control:

[0072] The microcontroller sends a signal, and the servo motor adjusts the baffle from 45° to 47.2°.

[0073] A closed-loop feedback mechanism will then be implemented.

[0074] The temperature sensor detected that the temperature rose to 795°C (still below 800°C).

[0075] The flow sensor detected a flow rate of 9.8 m³ / min (still below 10 m³ / min).

[0076] The PID controller continues to iterate and adjust until the error approaches zero.

[0077] The following are examples of decoupling strategies:

[0078] Control objective:

[0079]

[0080] Example of a coupling matrix:

[0081] Dynamic coupling relationships are obtained through system identification:

[0082]

[0083] The AI ​​dynamic adjustment process of PID parameters is as follows: Figure 10 As shown.

[0084] Process description:

[0085] Data flow (solid arrow):

[0086] Sensor data (temperature, O2, NOx) is preprocessed and then input into the AI ​​decision engine.

[0087] The AI ​​outputs dynamic PID parameters and feedforward compensation, which are applied to the microcontrollers and decouplers of the three PID controllers, respectively.

[0088] After the actuator (baffle) moves, the combustion system status changes and new data is fed back.

[0089] AI functional modules:

[0090] Coupled model: quantifying the interactive effects of pulverized coal, secondary air, and ammonia.

[0091] Cost function optimization: Balancing the control priorities of temperature, O2, and NOx.

[0092] Decoupling and feedforward: generating dynamic matrices and compensation coefficients.

[0093] Basic cost function formula:

[0094]

[0095] Parameter Description

[0096]

[0097] Dynamic weight adjustment strategy

[0098] In practical applications, the weighting coefficients can be dynamically adjusted according to the operating conditions:

[0099]

[0100] Dynamic logic:

[0101] When the temperature error remains large, α is automatically increased to prioritize stabilizing the temperature.

[0102] When the O2 concentration approaches the safety limit, reduce β to avoid over-adjustment.

[0103] The NOx weight γγ decays during the start-up and shutdown phases to avoid conflict with temperature control.

[0104] The specific steps include:

[0105] Step 1: Data acquisition and preprocessing.

[0106] Input data is collected through sensors, including the burner's combustion temperature, secondary air oxygen content, combustion exhaust NOx concentration, the opening of each damper, and load commands, and then uploaded to the AI ​​model on the cloud platform.

[0107] The sampling frequency is 1 second. If it is a high dynamic process, the sampling frequency can be increased.

[0108] Step 2, AI dynamic parameter tuning (cloud platform / edge computing).

[0109] Model selection: 1. LSTM: Predicts the dynamic response of the system (e.g., temperature hysteresis characteristics). 2. Reinforcement Learning (PPO): Optimizes long-term control costs.

[0110] Step 3: Multivariable decoupling control.

[0111] Flowchart as follows Figure 11 As shown. Decoupling matrix calculation (inverse coupling matrix):

[0112]

[0113] Feedforward compensation:

[0114] When the opening of the pulverized coal damper increases by 5%, the secondary air damper should be increased in advance:

[0115] ΔUair = 0.4 × 5% = 2%

[0116] Step 4: AI dynamic parameter tuning strategy.

[0117] Flowchart as follows Figure 12 As shown, the parameter tuning logic is as follows:

[0118] Proportional gain (Kp): Increased when the response speed is insufficient (e.g., the temperature delay caused by a pulverized coal baffle).

[0119] Integral gain (Ki): Adjusted when steady-state error persists (e.g., O2 deviates from the target for a long time).

[0120] Differential gain (Kd): Suppresses high-frequency oscillations (such as rapid fluctuations in NOx concentration).

[0121] Control Example:

[0122] Scenario: Load suddenly increases by 10%

[0123] 1. Initial state:

[0124] Temperature = 790°C, O2 = 2.8%, NOx = 55 mg / m³

[0125] Baffle opening: Pulverized coal = 50%, Secondary air = 40%, Ammonia = 30%

[0126] 2. AI Decision Making:

[0127] Target changes: Temperature needs to increase by 10°C, O2 needs to increase by 0.2%, NOx needs to decrease by 5 mg / m³

[0128]

[0129] 3. Feedforward compensation:

[0130] Secondary wind additionally increases: 0.4 × 12.6% ≈ 5%

[0131] Additional ammonia gas: 0.8 × 5 = 4%

[0132] 4. Execution control:

[0133] Pulverized coal baffle: 50% → 62.6%

[0134] Secondary air damper: 40% → 40 + 6.2 + 5 = 51.2%

[0135] Ammonia gas baffle: 30% → 30 + 12.5 + 4 = 46.5%

[0136] 5. Result Verification:

[0137] After steady state: temperature = 800.5°C, O2 = 3.02%, NOx = 49 mg / m³

[0138] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. An ammonia coal burner characterized by, include: The burner has a main housing, and one side of the main housing is provided with an air-coal conveying pipe for supplying pulverized coal and primary air. The main housing is also provided with a mixing chamber and a combustion chamber, and the air-coal conveying pipe is connected to the mixing chamber and the combustion chamber in sequence. The ammonia gas inlet mechanism has multiple first cyclone ducts installed on the main shell of the mixing chamber. The ammonia gas inlet mechanism is connected to the mixing chamber through the first cyclone ducts and forms a cyclone airflow in the mixing chamber. The secondary air intake mechanism has multiple second cyclone ducts installed on the main shell of the combustion chamber next to the mixing chamber. The secondary air intake mechanism is connected to the combustion chamber through the second cyclone ducts, forming a cyclone airflow in the combustion chamber that is opposite to that in the mixing chamber.

2. The ammonia coal combustor of claim 1, wherein, The ammonia gas inlet mechanism includes an ammonia gas inlet shell, an ammonia gas flow regulation module, an ammonia gas inlet pipe, and an ammonia gas pump. The ammonia gas inlet shell is fixed outside the mixing chamber at the first cyclone duct to form an ammonia gas inlet chamber. The ammonia gas inlet pipe connects the ammonia gas inlet chamber and the ammonia gas pump. The ammonia gas flow regulation module is installed on the ammonia gas inlet pipe and is used to regulate the intake volume of ammonia gas. The ammonia gas pump pressurizes the ammonia gas to form a cyclone airflow in the mixing chamber.

3. The ammonia-coal burner according to claim 2, characterized in that, The ammonia flow regulation module includes a first servo motor, a first valve body, and a first baffle. One end of the first baffle is rotatably disposed in the first valve body, and the other end of the first baffle extends out of the first valve body and is drivenly connected to the first servo motor.

4. The ammonia-coal burner according to claim 1, characterized in that, The secondary air intake mechanism includes a secondary air intake shell, a secondary air flow rate adjustment module, a secondary air intake pipe, and a secondary air pump. The secondary air intake shell is fixed outside the combustion chamber at the second cyclone duct to form a secondary air intake chamber. The secondary air intake pipe connects the secondary air intake chamber and the secondary air pump. The secondary air flow rate adjustment module is installed on the secondary air intake pipe to adjust the intake volume of the secondary air. The secondary air pump pressurizes the secondary air to form a cyclone airflow in the combustion chamber.

5. The ammonia-coal burner according to claim 4, characterized in that, The secondary airflow regulation module includes a second servo motor, a second valve body, and a second baffle. One end of the second baffle is rotatably disposed in the second valve body, and the other end of the second baffle extends out of the second valve body and is connected to the second servo motor for transmission.

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