A wind smoke monitoring control system and method
By combining the air and flue gas control platform with the frequency converter, the air preheater temperature and flue gas composition are monitored in real time, and the motor speed is adjusted, which solves the problems of air preheater blockage and low-temperature corrosion, and improves the stability and safety of the system.
Patent Information
- Application Number
- CN202610696456.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-20
- Publication Date
- 2026-07-31
AI Technical Summary
Existing flue gas monitoring and control systems cannot accurately control air preheaters, which can easily lead to air preheater blockage and affect the safety and economy of the system.
By combining sensors and frequency converters with the flue gas control platform, the temperature and flue gas composition of the air preheater are monitored in real time, and the motor speed is adjusted to control the flue gas outlet temperature of the air preheater and the exhaust temperature of the chimney, so as to prevent blockage and low-temperature corrosion.
It enables precise regulation of the flue gas outlet temperature of the air preheater and the exhaust temperature of the chimney, improving the stability and safety of the system, reducing energy consumption, and extending the service life of the equipment.
Smart Images
Figure CN122486402A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power technology, and in particular to a wind and smoke monitoring and control system and method. Background Technology
[0002] Flue gas monitoring and control systems are common configurations in thermal power plant boilers. They heat the primary and secondary air entering the boiler through an air preheater and recover waste heat from the flue gas, thereby improving combustion efficiency, reducing fuel consumption, and ensuring smooth flue gas discharge from the boiler. As a crucial component of thermal power plant boilers, the operation of the flue gas control system directly affects the boiler's safety and economy. However, existing flue gas monitoring and control systems still have technical problems in practical applications: existing flue gas monitoring and control systems can only perform simple start-up and shutdown control when controlling air preheaters, and cannot control them precisely, which can easily lead to air preheater blockage and affect the safety of flue gas monitoring and control systems. Summary of the Invention
[0003] This application is made in view of the above-mentioned problems. This application provides a smoke and dust monitoring and control system and method.
[0004] In a first aspect, embodiments of this application provide a smoke and gas monitoring and control system, including: Smoke and air control platform; An air preheater, wherein the flue gas outlet of the air preheater is connected to a chimney via a flue gas passage; An electric motor, connected to the air preheater, is used to drive the air preheater to rotate; A frequency converter, connected to the motor, is used to adjust the motor speed; The air preheater secondary air inlet temperature sensor is used to detect the secondary air inlet temperature of the air preheater; An air preheater flue gas detection device is used to detect the composition of the flue gas entering the air preheater; An air preheater flue gas outlet temperature sensor is used to detect the flue gas outlet temperature of the air preheater; A chimney exhaust temperature sensor is used to detect the exhaust temperature of the chimney. The flue gas control platform is connected to the frequency converter, the secondary air inlet temperature sensor of the air preheater, the flue gas detection device of the air preheater, the flue gas outlet temperature sensor of the air preheater, and the exhaust temperature sensor of the chimney.
[0005] Furthermore, a smoke monitoring and control system according to the first aspect of the embodiments of this application also includes: A flue gas heater is installed between the flue gas inlet of the chimney and the flue gas outlet of the air preheater, and is used to heat the flue gas entering the flue gas heater. A flue gas heater inlet temperature sensor is used to detect the temperature of the flue gas entering the flue gas heater; A chimney flue gas detection device is used to detect the composition of flue gas inside the chimney; The flue gas control platform is connected to the flue gas heater, the flue gas heater inlet temperature sensor, and the chimney flue gas detection device.
[0006] Furthermore, according to a smoke monitoring and control system based on a first aspect of the present application, the system further includes: A primary air heater is connected to the primary air inlet of the air preheater; A primary air heater inlet air temperature sensor is used to detect the inlet air temperature of the primary air heater. The primary air inlet temperature sensor for the air preheater is used to detect the primary air inlet temperature of the air preheater. A secondary air heater is connected to the secondary air inlet of the air preheater. A secondary air heater inlet air temperature sensor is installed at the inlet of the secondary air heater to detect the inlet air temperature of the secondary air heater. The air and smoke control platform is connected to the primary air heater, the primary air heater inlet temperature sensor, the air preheater primary air inlet temperature sensor, the secondary air heater, and the secondary air heater inlet temperature sensor, respectively.
[0007] Furthermore, according to a smoke monitoring and control system based on a first aspect of the present application, the system further includes: An anti-clogging ash blower is used for ash blowing operations on the air preheater; A monitoring device is installed in the air preheater to acquire a monitoring screen of the air preheater, which is used to determine whether the flue gas in the air preheater is blocked. The smoke control platform is connected to the anti-clogging fan and the monitoring device, respectively.
[0008] Secondly, embodiments of this application provide a smoke control method, applied to a smoke monitoring and control system according to any one of the second aspects, executed on a smoke control platform, the method comprising: The air preheater secondary air inlet temperature sensor, flue gas outlet temperature sensor, and exhaust gas temperature sensor are obtained to measure the air preheater secondary air inlet temperature, the air preheater flue gas outlet temperature sensor, and the chimney exhaust temperature sensor. The overall cold end temperature is determined based on the secondary air inlet temperature and the flue gas outlet temperature. The target exhaust gas temperature and the target cold end comprehensive temperature are obtained, wherein the target cold end comprehensive temperature is determined based on the flue gas composition detected by the air preheater flue gas detection device. The target speed of the motor is determined based on the overall cold end temperature, the target overall cold end temperature, the exhaust gas temperature, and the target exhaust gas temperature. Based on the target rotational speed, the frequency converter is controlled to adjust the motor speed.
[0009] Furthermore, according to a second aspect of the present application's smoke control method, obtaining the target exhaust temperature includes: Obtain the composition of flue gas inside the chimney as detected by the chimney flue gas detection device; The target exhaust temperature is determined based on the composition of the flue gas inside the chimney; The process of obtaining the target cold junction temperature includes: The composition of the flue gas entering the air preheater is obtained by the flue gas detection device for the air preheater. The target cold end temperature is determined based on the composition of the flue gas entering the air preheater.
[0010] Furthermore, according to a second aspect of the present application, a method for controlling smoke and gas emissions, wherein determining the target speed of the motor based on the overall cold-end temperature, the target overall cold-end temperature, the exhaust gas temperature, and the target exhaust gas temperature includes: The first target speed of the motor is determined based on the exhaust gas temperature and the target exhaust gas temperature; The second target speed of the motor is determined based on the combined cold end temperature and the target combined cold end temperature; The target speed is determined based on the first speed target and the second speed target.
[0011] Furthermore, according to a second aspect of the present application, a method for controlling exhaust gas includes determining a first target motor speed based on the exhaust gas temperature and the target exhaust gas temperature, comprising: When the exhaust gas temperature is higher than the target exhaust gas temperature, a first target speed of the motor is determined, and the first target speed is used to reduce the exhaust gas temperature. The method further includes: When the exhaust gas temperature is lower than the target exhaust gas temperature, the exhaust gas heater is controlled to increase its heating power.
[0012] Furthermore, according to a second aspect of the present application, a method for controlling smoke and dust, wherein determining a second target motor speed based on the combined cold-end temperature and the target combined cold-end temperature includes: Based on the inlet air temperature of the primary air heater, the primary air inlet air temperature of the air preheater, the inlet air temperature of the secondary air heater, the secondary air inlet air temperature of the air preheater, the overall cold end temperature, and the target overall cold end temperature, the heating power of the primary air heater, the heating power of the secondary air heater, and the target second speed of the motor are determined.
[0013] Furthermore, according to a second aspect of the embodiments of this application, a method for controlling smoke and dust further includes: Obtain the monitoring screen of the air preheater from the monitoring device; Based on the monitoring footage, determine whether the air preheater flue gas is blocked; If the flue gas in the air preheater becomes clogged, the anti-clogging fan is controlled to perform a soot blowing operation on the air preheater.
[0014] As will be described in detail below, the flue gas monitoring and control system and method according to the embodiments of this application control a frequency converter to adjust the motor speed based on the detected secondary air inlet temperature, air preheater flue gas outlet temperature, chimney exhaust temperature and air preheater flue gas composition, thereby achieving the purpose of controlling the air preheater speed, thereby achieving the adjustment of air preheater flue gas outlet temperature and chimney exhaust temperature, keeping them within a suitable temperature range, and improving the stability of system operation.
[0015] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description
[0016] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the accompanying drawings, the same reference numerals generally represent the same components or steps.
[0017] Figure 1 This is a schematic diagram of a smoke and gas monitoring and control system according to an embodiment of this application.
[0018] Figure 2 This is a flowchart illustrating a smoke monitoring and control method according to an embodiment of this application.
[0019] Figure 3 This is a flowchart illustrating the process of determining the target exhaust temperature in the smoke monitoring and control method of this application.
[0020] Figure 4 This is a flowchart illustrating the determination of the target cold end comprehensive temperature in the smoke monitoring and control method of this application.
[0021] Figure 5 This is a flowchart illustrating the determination of the target rotational speed in the smoke monitoring and control method of this application.
[0022] Figure 6 This is a flowchart further illustrating the soot blowing operation in the smoke monitoring and control method of this application embodiment; Figure 7 This is a schematic diagram illustrating the display content of a smoke and gas control platform according to an embodiment of this application. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this application more apparent, exemplary embodiments according to this application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.
[0024] Example 1: See Figure 1 A smoke and gas monitoring and control system, comprising: Smoke and air control platform 1; Air preheater 2, the flue gas outlet of air preheater 2 is used to connect to chimney 3 through flue gas passage; Motor 4 is connected to air preheater 2 and is used to drive air preheater 2 to rotate. Inverter 5 is connected to motor 4 and is used to adjust the speed of motor 4; The secondary air inlet temperature sensor 6 is used to detect the secondary air inlet temperature of the air preheater 2. The flue gas outlet temperature sensor 8 of the air preheater is used to detect the flue gas outlet temperature of the air preheater 2. The air preheater flue gas detection device 7 is used to detect the composition of the flue gas entering the air preheater 2; Chimney exhaust temperature sensor 9 is used to detect the exhaust temperature of chimney 3; The flue gas control platform 1 is connected to the frequency converter 5, the air preheater secondary air inlet temperature sensor 6, the air preheater flue gas detection device 7, the air preheater flue gas outlet temperature sensor 8, and the chimney exhaust temperature sensor 9, respectively.
[0025] According to the flue gas monitoring and control system of this application embodiment, based on the detected secondary air inlet temperature, air preheater flue gas outlet temperature, chimney exhaust temperature, and flue gas composition of the air preheater, the frequency converter is controlled to adjust the speed of the air preheater, thereby achieving the adjustment of the air preheater flue gas outlet temperature and the chimney exhaust temperature, keeping them within a suitable temperature range and improving the stability of system operation.
[0026] In this embodiment, the flue gas control platform 1 is connected to the frequency converter 5, enabling the platform 1 to control the frequency converter 5 to control the rotational speed of the air preheater 2 using a motor, thereby adjusting the flue gas outlet temperature of the air preheater 2 and the exhaust temperature of the chimney 3. The flue gas control platform 1 is connected to the air preheater secondary air inlet temperature sensor 6, the air preheater flue gas outlet temperature sensor 8, and the chimney exhaust temperature sensor 9, respectively. This allows the platform 1 to acquire the secondary air inlet temperature of the air preheater 2 detected by the secondary air inlet temperature sensor 6, the flue gas outlet temperature of the air preheater 2 detected by the flue gas outlet temperature sensor 8, and the exhaust temperature of the chimney 3 detected by the chimney exhaust temperature sensor 9. Based on these temperatures, the platform 1 controls the frequency converter to control the rotational speed of the air preheater 2 using a motor, thereby adjusting the flue gas outlet temperature of the air preheater 2 and the exhaust temperature of the chimney 3. It should be understood that by controlling the rotational speed of air preheater 2, the heat exchange rate of air preheater 2 can be controlled, thereby adjusting the overall cold-end temperature of air preheater 2 and the flue gas temperature of chimney 3. Knowing the secondary air inlet temperature, flue gas outlet temperature, and exhaust gas temperature, the overall cold-end temperature can be determined based on the secondary air inlet temperature and flue gas outlet temperature. Therefore, by obtaining the target value of the exhaust gas temperature (hereinafter referred to as the target exhaust gas temperature) and the target value of the adjusted overall cold-end temperature (hereinafter referred to as the target cold-end temperature), the required rotational speed target of air preheater 2 can be calculated. Based on the rotational speed target, the frequency converter 5 is controlled, thereby adjusting the flue gas outlet temperature of air preheater 2 and the exhaust gas temperature of chimney 3. This achieves a closed loop of monitoring, calculation, determination of the target rotational speed, frequency converter adjustment, feedback, and monitoring, avoiding temperature anomalies and effectively improving the stability and safety of system operation.
[0027] Excessively low cold-end integrated temperature of the air preheater can lead to ammonium bisulfate condensation, causing blockage and low-temperature corrosion. The target cold-end integrated temperature is a temperature value determined to prevent ammonium bisulfate condensation and blockage; the target flue gas temperature is a temperature value determined to prevent low-temperature corrosion. When determining the target flue gas temperature, the economic efficiency of system operation can also be considered. In other words, the target flue gas temperature can be a value determined by preventing low-temperature corrosion while considering economic factors. The target flue gas temperature can be preset or dynamically determined based on the composition of the flue gas inside the chimney 3; the target cold-end integrated temperature is determined based on the flue gas composition monitored in real time by the air preheater flue gas detection device 7, ensuring that the target cold-end integrated temperature matches the actual flue gas composition and guarantees the accuracy and timeliness of control. For example, target cold-end integrated temperatures can be set for each flue gas component. Based on the detected flue gas composition entering the air preheater 2, the corresponding target cold-end integrated temperature is determined. This step can be performed by the flue gas control platform 1 or by the air preheater flue gas detection device 7. It should be understood that excessively high flue gas temperature can also cause economic losses. When determining the target flue gas temperature, an economic loss factor can also be considered. The target flue gas temperature can be a specific value or a range of values.
[0028] Based on this, to avoid ambiguity, the terminology of relevant parts is explained in the embodiments of this application: air preheater 2 is an air preheater, secondary air inlet refers to the inlet of the secondary air passage of air preheater 2, and flue gas outlet refers to the outlet of the flue gas passage of air preheater 2. Similarly, in other embodiments, primary air inlet refers to the inlet of the primary air passage of air preheater 2. The air preheater 2 in the embodiments of this application can be an air preheater with a secondary air passage and a flue gas passage, for example, a rotary air preheater with a primary air passage, a secondary air passage, and a flue gas passage. In this structure, primary air enters through the primary air inlet, is heated through the primary air passage, and is then output to the hot primary air header 20; secondary air enters through the secondary air inlet, is heated through the secondary air passage, and is then output to the furnace 21; flue gas from the rear flue gas shaft 22 flows through the flue gas passage and is discharged to the chimney 3 through the flue gas outlet.
[0029] For example, the flue gas control platform 1 can acquire the air preheater secondary air inlet temperature detected by the air preheater secondary air inlet temperature sensor 6, the flue gas outlet temperature detected by the air preheater flue gas outlet temperature sensor 8, and the exhaust gas temperature detected by the chimney exhaust gas temperature sensor 9; determine the cold end comprehensive temperature based on the secondary air inlet temperature and the flue gas outlet temperature; acquire the target exhaust gas temperature and the target cold end comprehensive temperature, the target cold end comprehensive temperature being determined based on the flue gas composition detected by the air preheater flue gas detection device 7; determine the target speed of motor 4 based on the cold end comprehensive temperature, the target cold end comprehensive temperature, the exhaust gas temperature, and the target exhaust gas temperature; and control the frequency converter 5 to adjust the speed of motor 4 based on the target speed. This causes the cold end comprehensive temperature to change towards the target cold end comprehensive temperature and the exhaust gas temperature to change towards the target exhaust gas temperature, thereby reducing energy consumption and improving equipment operational stability.
[0030] The flue gas components in this application embodiment may include nitrogen oxides, sulfur oxides, moisture, and ash. Specifically, it may be the percentage content of nitrogen oxides, sulfur oxides, moisture, and ash.
[0031] In one implementation, the system further includes: The flue gas heater 10 is located between the flue gas inlet of the chimney 3 and the flue gas outlet of the air preheater 2, and is used to heat the flue gas entering the flue gas heater 10. The flue gas heater inlet temperature sensor 11 is used to detect the temperature of the flue gas entering the flue gas heater 10; Chimney flue gas detection device 12 is used to detect the composition of flue gas inside chimney 3; The flue gas control platform 1 is connected to the flue gas heater 10, the flue gas heater inlet temperature sensor 11, and the chimney flue gas detection device 12, respectively.
[0032] In this embodiment, the flue gas control platform 1 is connected to the exhaust gas heater 10, the exhaust gas heater inlet temperature sensor 11, and the chimney flue gas detection device 12, respectively, thereby enabling it to: acquire the flue gas temperature entering the exhaust gas heater 10; determine the target exhaust gas temperature based on the flue gas composition in the chimney 3; and control the exhaust gas heater 10 accordingly. Specifically, the flue gas control platform 1 can use the flue gas outlet temperature of the air preheater 2 and the target exhaust gas temperature as one of the reference bases for determining the target rotational speed of the air preheater 2, and at the same time use the target exhaust gas temperature and the exhaust gas heater inlet flue gas temperature as the adjustment basis for the exhaust gas heater 10, so as to achieve coordinated control of the air preheater rotational speed and the exhaust gas heating power, thereby ensuring that the exhaust gas temperature is within a reasonable range and improving the stability and economy of the system operation.
[0033] In one implementation, the system further includes: The primary air heater 13 is connected to the primary air inlet of the air preheater 2; The primary air heater inlet air temperature sensor 14 is used to detect the inlet air temperature of the primary air heater 13; The primary air inlet temperature sensor 15 is used to detect the primary air inlet temperature of the air preheater 2. The secondary air heater 16 is connected to the secondary air inlet of the air preheater 2; The secondary air heater inlet air temperature sensor 17 is installed at the inlet of the secondary air heater 16 to detect the inlet air temperature of the secondary air heater 16. The flue gas control platform 1 is connected to the primary air heater 13, the primary air heater inlet temperature sensor 14, the air preheater primary air inlet temperature sensor 15, the secondary air heater 16, and the secondary air heater inlet temperature sensor 17, respectively.
[0034] In this embodiment, the air intake 23 of the primary air heater 13 can be connected to the atmosphere, and the air intake 24 of the secondary air heater 16 can also be connected to the atmosphere, so that external air can be directly introduced for heating.
[0035] In this embodiment, the flue gas control platform 1 is connected to the primary air heater 13, the primary air heater inlet temperature sensor 14, the air preheater primary air inlet temperature sensor 15, the secondary air heater 16, and the secondary air heater inlet temperature sensor 17. It can acquire the primary air heater inlet temperature, the secondary air heater inlet temperature, and the air preheater primary air inlet temperature in real time, and adjust and control the primary air heater 13 and the secondary air heater 16 based on the acquired data, thereby ensuring that the primary and secondary air temperatures are within a reasonable range, improving the heat exchange efficiency of the air preheater and the stability of the system operation.
[0036] In one implementation, the system further includes: The anti-clogging ash blower 18 is used for blowing ash onto the air preheater 2; The monitoring device 19 is installed in the air preheater 2 and is used to acquire the monitoring screen of the air preheater 2. The monitoring screen is used to determine whether the flue gas in the air preheater 2 is blocked. The smoke and dust control platform 1 is connected to the anti-clogging ash fan 18 and the monitoring device 19 respectively.
[0037] In this embodiment, the flue gas control platform 1 is connected to the anti-clogging fan 18 and the monitoring device 19, and can obtain the monitoring screen of the monitoring device 19 and determine whether the flue gas in the air preheater 2 is blocked based on the screen; when the blockage is detected, the anti-clogging fan 18 is controlled to perform a soot blowing operation on the air preheater 2, so as to remove the accumulated ash in time, ensure the flue gas passage is unobstructed and maintain the stable operation of the system.
[0038] In one embodiment, the motor 4 includes a main motor M1 and an auxiliary motor M2. The main motor M1 is used to drive the normal operation of the air preheater 2, and the auxiliary motor M2 is used to provide supplementary power when the main motor M1 fails or needs auxiliary drive, so as to ensure the continuous and stable operation of the air preheater 2.
[0039] Example 2: The frequency converter 5 is powered by the power supply 25 to provide stable power for the operation of the frequency converter 5, thereby realizing the adjustment and control of the speed of the motor 4.
[0040] See Figure 1 and Figure 2 A smoke control method is applied to a smoke monitoring and control system according to an embodiment of this application, and is executed on a smoke control platform 1. The method includes: S201, acquire the air preheater secondary air inlet temperature detected by the air preheater secondary air inlet temperature sensor, the flue gas outlet temperature detected by the air preheater flue gas outlet temperature sensor, and the exhaust gas temperature detected by the chimney exhaust gas temperature sensor.
[0041] S202, determine the overall cold end temperature based on the secondary air inlet temperature and the flue gas outlet temperature.
[0042] In this step, the temperature can be determined based on the relevant cold-end comprehensive temperature determination method, specifically the secondary air inlet temperature and the flue gas outlet temperature. This application's embodiments are not limited to this step.
[0043] S203, obtain the target exhaust gas temperature and the target cold end comprehensive temperature. The target cold end comprehensive temperature is determined based on the flue gas composition detected by the air preheater flue gas detection device.
[0044] In this embodiment, the target cold-end comprehensive temperature is a temperature value determined to prevent air preheater blockage caused by ammonium bisulfate condensation; the target flue gas temperature is a temperature value determined to prevent low-temperature corrosion. When determining the target flue gas temperature, the economic efficiency of system operation can also be considered. The target flue gas temperature can be preset or dynamically determined based on the composition of the flue gas inside the chimney 3; the target cold-end comprehensive temperature is determined based on the flue gas composition monitored in real time by the air preheater flue gas detection device 7.
[0045] S204. Determine the target speed of the motor based on the cold end comprehensive temperature, the target cold end comprehensive temperature, the exhaust gas temperature, and the target exhaust gas temperature.
[0046] In this application, the target speed of the motor is determined based on the cold end temperature, the target cold end temperature, the exhaust gas temperature, and the target exhaust gas temperature.
[0047] S205 controls the frequency converter to adjust the motor speed according to the target speed.
[0048] In this embodiment of the application, when the air preheater 2 is running at the target speed, the cold end comprehensive temperature can be stably close to the target cold end comprehensive temperature, and the flue gas temperature can be stably close to the target flue gas temperature. This effectively avoids air preheater blockage caused by ammonium bisulfate condensation and inhibits low-temperature corrosion of the chimney 3, reducing the risk of air preheater blockage and low-temperature corrosion of the chimney, and ensuring the safe and stable operation of the flue gas control system.
[0049] In one implementation, see Figure 1 and Figure 3 To obtain the target flue gas temperature, including: S301, Obtain the composition of flue gas inside the chimney as detected by the chimney flue gas detection device.
[0050] S302, determine the target exhaust temperature based on the composition of the flue gas inside the chimney.
[0051] In this embodiment, the target exhaust temperature is determined based on the flue gas composition inside the chimney 3, so that the target exhaust temperature can be updated in real time according to the flue gas composition, making the air preheater speed control more adaptable to the real-time environment.
[0052] In one implementation, see Figure 1 and Figure 4 Obtain the target cold end comprehensive temperature, including: S401, Obtain the composition of the flue gas entering the air preheater as detected by the flue gas detection device.
[0053] S402, determine the target cold end integrated temperature based on the composition of the flue gas entering the air preheater.
[0054] In this embodiment, the target cold-end comprehensive temperature is determined based on the composition of the flue gas entering the air preheater 2. This makes the air preheater speed control more adaptable to the real-time environment.
[0055] In one implementation, see Figure 1 and Figure 5 The target speed of the motor is determined based on the combined cold end temperature, the target combined cold end temperature, the exhaust gas temperature, and the target exhaust gas temperature, including: S501 determines the first target speed of the motor based on the exhaust gas temperature and the target exhaust gas temperature.
[0056] S502 determines the second target speed of the motor based on the combined cold end temperature and the target combined cold end temperature.
[0057] S503, determine the target speed based on the first speed target and the second speed target.
[0058] In this embodiment, a first target rotational speed of motor 4 is determined based on the exhaust gas temperature and the target exhaust gas temperature. A second target rotational speed of motor 4 is determined based on the combined cold-end temperature and the target combined cold-end temperature. Finally, a target rotational speed is determined based on the first and second rotational speed targets.
[0059] In one embodiment, determining a first target speed for the motor based on the exhaust gas temperature and the target exhaust gas temperature includes: determining a first target speed for the motor when the exhaust gas temperature is higher than the target exhaust gas temperature, wherein the first target speed is used to determine the change in exhaust gas temperature toward the target exhaust gas temperature when the motor rotates at the first target speed.
[0060] In one implementation, determining the second target speed of the motor based on the combined cold-end temperature and the target combined cold-end temperature includes: Based on the inlet air temperature of the primary air heater 13, the primary air inlet temperature of the air preheater 2, the inlet air temperature of the secondary air heater 16, the secondary air inlet temperature of the air preheater 2, the overall cold-end temperature, and the target overall cold-end temperature, the heating power of the primary air heater 13, the heating power of the secondary air heater, and the second target motor speed are determined. The second target speed is used to determine the change in exhaust gas temperature towards the target overall cold-end temperature when the motor rotates at the second target speed. The heating power of the primary air heater 13 and the heating power of the secondary air heater can be used to adjust the primary air inlet temperature and the secondary air inlet temperature of the air preheater 2. In actual determination, the second target speed can be determined by comprehensive judgment.
[0061] In one implementation, see Figure 1 and Figure 6 The methods also include: S601, obtain the monitoring screen of the air preheater from the monitoring device.
[0062] S602, based on the monitoring screen, determines whether the air preheater flue gas is blocked.
[0063] S603 If the flue gas in the air preheater is blocked, the anti-clogging fan will be controlled to perform soot blowing operation on the air preheater.
[0064] The monitoring screen of air preheater 2 is a monitoring screen related to the flue gas passage inside air preheater 2, used to determine whether the flue gas in air preheater 2 is blocked. When it is determined that the flue gas in air preheater 2 is blocked, the anti-blockage ash blower 18 is controlled to perform soot blowing operation on air preheater 2.
[0065] Example 3: See Figure 1The flue gas monitoring and control system's flue gas control platform is an online flue gas monitoring DCS control platform. The flue gas control platform 1 collects data in real-time from the following sensors via signal transmission lines: primary air heater inlet temperature sensor 14, air preheater primary air inlet temperature sensor 15, secondary air heater inlet temperature sensor 17, air preheater secondary air inlet temperature sensor 6, air preheater flue gas detection device 7, air preheater flue gas outlet temperature sensor 8, exhaust heater inlet temperature sensor 11, chimney flue gas detection device 12, chimney exhaust temperature sensor 9, and monitoring device 19. The frequency converter 5 is used for frequency conversion control of the air preheater's main and auxiliary motors. The flue gas control platform 1 can adjust the air preheater speed in real-time as needed via the frequency converter 5. Based on the collected data, the flue gas control platform 1 can adjust the heating power of the primary air heater 13 in real-time, thereby adjusting the temperature of the primary air entering the air preheater. The flue gas control platform 1 can also adjust the temperature of the primary air entering the air preheater based on the collected data. The heating power of the secondary air heater 16 is adjusted in real time to adjust the temperature of the secondary air entering the air preheater; the air preheater flue gas detection device 7 can monitor the composition of the flue gas entering the air preheater in real time, which can include the content of nitrogen oxides, sulfur oxides, moisture and ash, and analyze the target cold end comprehensive temperature in real time, which can be the optimal cold end comprehensive temperature; the chimney flue gas detection device 12 can monitor the composition of the flue gas in real time and analyze the target exhaust temperature, which can be the optimal exhaust temperature; the flue gas control platform 1 can control the exhaust heater 10 to adjust the exhaust temperature based on the collected data; the monitoring device 19 is a real-time monitoring device installed on the air preheater, which can remotely monitor the blockage in the air preheater through related equipment; the flue gas online monitoring DCS flue gas control platform 1 can control the anti-clogging ash blower 18 to perform soot blowing operation based on the collected data.
[0066] See Figure 7 The display content of the smoke and dust control platform may include: Frequency converters: remote, local, upper frequency limit, lower frequency limit; Primary air heater: automatic, manual, primary air heater inlet temperature, air preheater primary air inlet temperature; Secondary air heater: automatic, manual, secondary air heater inlet temperature, air preheater secondary air inlet temperature; Flue gas heater: automatic, manual, air preheater flue gas outlet temperature, chimney flue gas temperature; Air preheater flue gas detection device: sulfur oxides, nitrogen oxides, moisture, ash content, and cold end temperature; Chimney flue gas detection device: sulfur oxides, nitrogen oxides, moisture, ash content; Cold end integrated temperature control, air preheater soot blowing control, and chimney exhaust temperature control; Alarm information and operational analysis.
[0067] In one embodiment, the frequency conversion control of the air preheater motor in the flue gas monitoring and control system includes: Real-time online acquisition of unit load, air preheater secondary air inlet temperature, air preheater flue gas outlet temperature, and chimney exhaust temperature; The combined cold end temperature of the air preheater is determined by summing the secondary air inlet temperature and the flue gas outlet temperature of the air preheater. The real-time speed of the air preheater is determined according to the principle that the air preheater operation meets the current load requirements, the combined cold end temperature meets the requirements, and the exhaust gas temperature is optimal. The DCS control system sends adjustment commands to the air preheater frequency converter in real time, controlling the air preheater motor to adjust its speed in real time, so as to meet the requirements of optimal air preheater operation and optimal flue gas temperature.
[0068] In one implementation, the chimney exhaust temperature of the flue gas monitoring and control system is controlled in real time, including: Real-time online acquisition of chimney exhaust temperature and chimney flue gas detection device data; Analyze the collected flue gas data to determine the optimal flue gas exhaust temperature and the relative magnitude of the real-time flue gas temperature and the optimal exhaust temperature. When the real-time flue gas temperature is low, the system sends an adjustment command to the flue gas heater in real time to control the flue gas heater to adjust the heating power in real time. When the real-time flue gas temperature is high, the system adjusts the air preheater outlet flue gas temperature by regulating the air preheater speed in real time through the air preheater frequency converter; ultimately obtaining the optimal flue gas temperature.
[0069] In one implementation, the real-time control of the cold-end integrated temperature of the flue gas monitoring and control system includes: The system acquires the following in real time online: primary air heater inlet temperature, air preheater primary air inlet temperature, secondary air heater inlet temperature, air preheater secondary air inlet temperature, air preheater flue gas outlet temperature, and flue gas composition detected by the air preheater flue gas monitoring device. The combined cold end temperature of the air preheater is determined by the sum of the secondary air inlet temperature and the flue gas outlet temperature of the air preheater. After the system obtains the overall cold end temperature in real time, it controls the overall cold end temperature of the air preheater by adjusting the heating power of the primary air heater, the heating power of the secondary air heater, and the speed of the air preheater.
[0070] In one implementation, the real-time control of the anti-clogging fan in the smoke monitoring and control system includes: The system can acquire the following information online in real time: real-time monitoring screen of the air preheater, flue gas monitoring device of the air preheater, and current operating status of the anti-clogging ash blower; Staff can use computers or other terminals to view the scaling and blockage inside the air preheater in real time to determine whether cleaning is necessary. If it is necessary to clear the blockage, the air preheater can be cleaned online by controlling the anti-blockage fan and the soot blowing system.
[0071] In this embodiment of the application, the air preheater is designed with a frequency conversion feature, which allows the air preheater speed to be adjusted in real time as needed, thereby reducing energy consumption and improving the stability of equipment operation.
[0072] This application embodiment can acquire flue gas temperature and gas composition online in real time, obtain the target cold end comprehensive temperature and target flue gas temperature in real time, and automatically or manually control related equipment in real time, thereby improving the safety and economy of power plant operation. In this embodiment, real-time monitoring of the air preheater allows staff to monitor the air preheater's blockage status in real time, and online soot blowing allows for remote adjustment of the soot blowing intensity as needed, reducing air preheater blockage and extending equipment lifespan.
[0073] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.
[0074] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” and “having” are open-ended terms meaning “including but not limited to” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to” and is used interchangeably with it.
[0075] Additionally, as used herein, the "or" used in a list of items beginning with "at least one" indicates a separate list, such that a list of, for example, "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC, i.e., A and B and C. Furthermore, the word "exemplary" does not imply that the described example is preferred or better than other examples.
[0076] It should also be noted that in the system and method of this application, the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of this application.
[0077] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims is not limited to the specific aspects of the processes, machines, manufactures, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufactures, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Therefore, the appended claims include such processes, machines, manufactures, events, means, methods, or actions within their scope.
[0078] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.
[0079] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.
Claims
1. A smoke and gas monitoring and control system, characterized in that, include: Smoke and air control platform (1); Air preheater (2), the flue gas outlet of which is connected to the chimney (3) through a flue gas passage; The motor (4) is connected to the air preheater (2) and is used to drive the air preheater (2) to rotate; A frequency converter (5) is connected to the motor (4) and is used to adjust the speed of the motor (4); The air preheater secondary air inlet temperature sensor (6) is used to detect the secondary air inlet temperature of the air preheater (2); Air preheater flue gas detection device (7) is used to detect the composition of flue gas entering the air preheater (2); The flue gas outlet temperature sensor (8) of the air preheater is used to detect the flue gas outlet temperature of the air preheater (2); Chimney exhaust temperature sensor (9) is used to detect the exhaust temperature of the chimney (3); The flue gas control platform (1) is connected to the frequency converter (5), the air preheater secondary air inlet temperature sensor (6), the air preheater flue gas detection device (7), the air preheater flue gas outlet temperature sensor (8), and the chimney exhaust temperature sensor (9), respectively.
2. The smoke and gas monitoring and control system according to claim 1, characterized in that, The system also includes: A flue gas heater (10) is installed between the flue gas inlet of the chimney (3) and the flue gas outlet of the air preheater (2) to heat the flue gas entering the flue gas heater (10); The flue gas heater inlet temperature sensor (11) is used to detect the temperature of the flue gas entering the flue gas heater (10); Chimney flue gas detection device (12) is used to detect the composition of flue gas inside the chimney (3); The flue gas control platform (1) is connected to the flue gas heater (10), the flue gas heater inlet temperature sensor (11), and the chimney flue gas detection device (12), respectively.
3. The smoke and gas monitoring and control system according to claim 1, characterized in that, The system also includes: A primary air heater (13) is connected to the primary air inlet of the air preheater (2); A primary air heater inlet air temperature sensor (14) is used to detect the inlet air temperature of the primary air heater (13); The primary air inlet temperature sensor (15) of the air preheater is used to detect the primary air inlet temperature of the air preheater (2); A secondary air heater (16) is connected to the secondary air inlet of the air preheater (2); A secondary air heater inlet air temperature sensor (17) is installed at the inlet of the secondary air heater (16) to detect the inlet air temperature of the secondary air heater (16); The air and smoke control platform (1) is connected to the primary air heater (13), the primary air heater inlet air temperature sensor (14), the air preheater primary air inlet temperature sensor (15), the secondary air heater (16), and the secondary air heater inlet air temperature sensor (17), respectively.
4. The smoke and gas monitoring and control system according to claim 1, characterized in that, The system also includes: An anti-clogging blower (18) is used to perform soot blowing operation on the air preheater (2); A monitoring device (19) is installed in the air preheater (2) to acquire the monitoring screen of the air preheater (2), and the monitoring screen is used to determine whether the flue gas of the air preheater (2) is blocked. The smoke control platform (1) is connected to the anti-clogging ash fan (18) and the monitoring device (19) respectively.
5. A method for controlling smoke and dust, characterized in that, Applied to the smoke and dust monitoring and control system according to any one of claims 1 to 4, and executed on the smoke and dust control platform (1), the method includes: The air preheater secondary air inlet temperature is obtained by the air preheater secondary air inlet temperature sensor (6), the flue gas outlet temperature is obtained by the air preheater flue gas outlet temperature sensor (8), and the exhaust temperature is obtained by the chimney exhaust temperature sensor (9). The overall cold end temperature is determined based on the secondary air inlet temperature and the flue gas outlet temperature. The target exhaust temperature and the target cold end comprehensive temperature are obtained, and the target cold end comprehensive temperature is determined based on the flue gas composition detected by the air preheater flue gas detection device (7). The target speed of motor (4) is determined based on the overall cold end temperature, the target overall cold end temperature, the exhaust temperature, and the target exhaust temperature. Based on the target speed, the frequency converter (5) is controlled to adjust the speed of the motor (4).
6. The method for controlling smoke and dust according to claim 5, characterized in that, The process of obtaining the target flue gas temperature includes: Obtain the flue gas composition inside the chimney (3) detected by the chimney flue gas detection device (12); The target exhaust temperature is determined based on the composition of the flue gas inside the chimney (3); The process of obtaining the target cold junction temperature includes: Obtain the composition of the flue gas entering the air preheater (2) as detected by the air preheater flue gas detection device (7); The target cold end temperature is determined based on the composition of the flue gas entering the air preheater (2).
7. The method for controlling smoke and dust according to claim 5, characterized in that, The step of determining the target speed of the motor (4) based on the overall cold end temperature, the target overall cold end temperature, the exhaust temperature, and the target exhaust temperature includes: The first target speed of the motor is determined based on the exhaust gas temperature and the target exhaust gas temperature; The second target speed of the motor is determined based on the combined cold end temperature and the target combined cold end temperature; The target speed is determined based on the first speed target and the second speed target.
8. The method for controlling smoke and dust according to claim 7, characterized in that, Determining the first target speed of the motor based on the exhaust gas temperature and the target exhaust gas temperature includes: When the exhaust gas temperature is higher than the target exhaust gas temperature, a first target speed of the motor is determined, and the first target speed is used to reduce the exhaust gas temperature. The method further includes: When the exhaust temperature is lower than the target exhaust temperature, the exhaust heater (10) is controlled to increase the heating power.
9. A method for controlling smoke and dust according to claim 7, characterized in that, Determining the second target speed of the motor based on the combined cold end temperature and the target combined cold end temperature includes: Based on the inlet air temperature of the primary air heater (13), the primary air inlet air temperature of the air preheater (2), the inlet air temperature of the secondary air heater (16), the secondary air inlet air temperature of the air preheater (2), the cold end comprehensive temperature, and the target cold end comprehensive temperature, the heating power of the primary air heater (13), the heating power of the secondary air heater, and the second speed target of the motor are determined.
10. A method for controlling smoke and dust according to claim 5, characterized in that, The method further includes: The monitoring screen of the air preheater (2) is obtained from the monitoring device (19); Based on the monitoring screen, determine whether the flue gas in the air preheater (2) is blocked; If the flue gas in the air preheater (2) is blocked, the anti-blockage blower (18) is controlled to perform a soot blowing operation on the air preheater (2).