Sound wave integration system and method for SCR denitration temperature measurement and soot blowing

Abstract

The invention provides a sound wave integration system and method for SCR denitration temperature measurement and soot blowing. The sound wave integration system comprises an SCR reactor, a data acquisition device, a data analysis device, a soot blowing controller, a temperature measurement controller, a sound wave generator and a sound wave receiver. The data acquisition device converts a sound wave reflection signal of the sound wave receiver to obtain a conversion signal, and the data analysis device generates a temperature measurement soot blowing control strategy according to the conversion signal and sends a control instruction to the soot blowing controller and the temperature measurement controller to control the sound wave soot blowing temperature measurement device to perform temperature measurement or soot blowing on the corresponding catalyst layer. The intelligent control system realizes coordinated operation of two functions, optimally controls the soot blower to blow soot as required, reduces pipe wall abrasion and steam electric energy consumption loss caused by unreasonable soot blowing, guarantees the performance of a catalyst and prolongs the service life of the catalyst. By the adoption of the technical scheme, accurate temperature monitoring and efficient soot blowing can be achieved, and the operation efficiency and safety of the SCR system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust gas denitration, and in particular to an acoustic wave integrated system and method for SCR denitration temperature measurement and soot blowing. Background Art

[0002] Temperature is a key factor affecting denitrification efficiency. The Selective Catalytic Reduction (SCR) denitrification reaction process must proceed within an appropriate temperature range. Excessively high or low temperatures can reduce catalyst activity, resulting in poor denitrification results. Real-time temperature monitoring can optimize reaction conditions and ensure efficient and stable operation of the denitrification system.

[0003] Sootblowing is performed to remove dust and impurities that accumulate on the catalyst surface. Dust accumulation can clog the catalyst pores, reducing its effective reaction area and lowering denitrification efficiency. Regular sootblowing keeps the catalyst clean, extending its service life and ensuring the continued efficient operation of the SCR unit.

[0004] The temperature measurement technologies currently used in SCR denitrification systems primarily include thermocouples, infrared thermometers, and fiber optic temperature measurement. Thermocouples obtain temperature data by measuring the potential difference generated by temperature changes and are suitable for high-temperature environments. Infrared thermometers measure temperature by detecting infrared radiation emitted by objects, offering non-contact and fast response. Fiber optic temperature measurement utilizes optical fiber sensors to measure temperature, offering advantages such as immunity to electromagnetic interference and corrosion resistance, making it suitable for complex operating conditions.

[0005] The main soot blowing technologies used in SCR denitrification systems include steam, sonic, and compressed air. Steam soot blowing removes accumulated soot by impacting the catalyst surface with high-pressure steam, but this can damage the catalyst. Sonic soot blowing uses acoustic vibrations to dislodge accumulated soot, offering the advantages of being contactless and non-destructive. Compressed air soot blowing removes accumulated soot with high-pressure air jets. While simple to operate, it requires high sealing performance.

[0006] However, the temperature measurement soot blowing in the prior art has the following technical problems: Conventional contact-type temperature measurement elements, such as thermocouples, require direct contact with the SCR denitrification system's high-temperature containers and flowing media. These elements are susceptible to high-temperature flue gas and corrosive media, leading to reduced temperature measurement performance and shortened lifespan. Furthermore, temperature measurement elements penetrating deep into the medium can alter the measured temperature distribution, introducing measurement errors. While non-contact temperature measurement devices avoid the contact issue, infrared thermometers are significantly affected by factors such as the object's emissivity, the intermediate medium, and environmental interference, resulting in significant measurement errors. Fiber-optic temperature measurement instruments are complex and expensive.

[0007] The main drawback of using steam sootblowing technology in SCR denitrification systems is that the high temperature and humidity of the steam can cause thermal stress and moisture damage to the catalyst, affecting its activity and lifespan. Steam sootblowing can also cause condensation inside the equipment, increasing the risk of corrosion, and consumes a lot of energy. In the sonic sootblowing devices used in SCR denitrification systems, sonic sootblowing loosens and removes accumulated soot through low-frequency, high-energy acoustic vibrations. However, excessively high operating frequencies can subject the catalyst surface to prolonged high-frequency vibrations, leading to fatigue of the catalyst's internal structure and reduced strength. High-frequency vibrations can loosen or even cause the active components within the catalyst's micropores to fall off, reducing the catalyst's catalytic activity. Repeated impacts of acoustic energy can also cause microcracks on the catalyst surface, further weakening its structural stability and shortening its service life.

[0008] Therefore, how to improve the temperature detection accuracy of the SCR denitration system, and ensure the performance of the catalyst and extend its life is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0009] The present invention provides an integrated acoustic wave system and method for SCR denitration temperature measurement and soot blowing, which are used to solve the defects of the SCR denitration system in the prior art, such as low temperature detection accuracy, low catalyst performance and short life.

[0010] In one aspect, the present invention provides an acoustic wave integrated system for SCR denitration temperature measurement and soot blowing, which includes an SCR reactor, an acoustic wave soot blowing temperature measurement device, a data acquisition device, and a data analysis device; The SCR reactor is provided with a plurality of catalyst layers; The sonic sootblowing temperature measurement device includes a sootblowing controller, a temperature measurement controller, a sonic wave generator, and a sonic wave receiver; wherein the sonic sootblowing temperature measurement device is arranged corresponding to the multiple catalyst layers; the sootblowing controller and the temperature measurement controller are respectively connected to the sonic wave generator; The data acquisition device is connected to the acoustic wave receiver and the data analysis device; the data analysis device is also connected to the soot blowing controller and the temperature measurement controller; The data acquisition device converts the acoustic wave reflection signal of the acoustic wave receiver to obtain a conversion signal, and sends it to the data analysis device. The data analysis device generates a temperature measurement and sootblowing control strategy based on the conversion signal, and sends control instructions to the sootblowing controller and the temperature measurement controller to control the acoustic wave sootblowing and temperature measurement device to measure the temperature or blow soot on the corresponding catalyst layer.

[0011] According to the present invention, a sound wave integration method for SCR denitration temperature measurement and soot blowing is provided, wherein the conversion signal includes at least one of the sound wave propagation time, the sound wave attenuation degree and the sound wave reflection intensity; the data acquisition device is further used to obtain the catalytic efficiency of each catalyst layer; The data analysis device is specifically used for: determining temperature data of each catalyst layer and dust accumulation data of each catalyst layer according to at least one of the sound wave propagation time, the sound wave attenuation degree, and the sound wave reflection intensity; determining a deterioration index of each catalyst layer according to the temperature data of each catalyst layer, the dust accumulation data of each catalyst layer, and the catalytic efficiency of each catalyst layer; According to the deterioration index of each catalyst layer, the temperature measurement time and the soot blowing time in the current temperature measurement and soot blowing cycle of each catalyst layer are determined as the temperature measurement and soot blowing control strategy.

[0012] According to an acoustic wave integration method for SCR denitration temperature measurement and soot blowing provided by the present invention, the temperature data of each catalyst layer includes the real-time temperature of each catalyst layer, and the soot accumulation data of each catalyst layer includes the pressure difference of each catalyst layer; The data analysis device is also used for: determining a temperature deviation of each catalyst layer according to the real-time temperature of each catalyst layer and the set temperature of each catalyst layer; determining a pressure difference change rate of each catalyst layer according to the pressure difference of each catalyst layer and the maximum allowable pressure difference of each catalyst layer; determining a catalytic efficiency loss of each catalyst layer according to the catalytic efficiency of each catalyst layer and a preset efficiency of each catalyst layer; A deterioration index of each catalyst layer is determined according to the temperature deviation of each catalyst layer, the pressure difference change rate of each catalyst layer, the catalytic efficiency loss of each catalyst layer, and their respective weights.

[0013] According to the acoustic wave integration method for SCR denitration temperature measurement and soot blowing provided by the present invention, the data analysis device is further used to: determining the proportion of the sootblowing time according to the pressure difference change rate of each catalyst layer, the catalytic efficiency loss of each catalyst layer, their respective weights, and the deterioration index of each catalyst layer; Determining the soot blowing time according to the proportion and the current temperature measurement soot blowing cycle; The temperature measurement time is determined according to the soot blowing time and the current temperature measurement soot blowing cycle.

[0014] According to the acoustic wave integration method for SCR denitration temperature measurement and soot blowing provided by the present invention, the data analysis device is further used to: determining a sootblowing efficiency of each catalyst layer; If the soot blowing efficiency of the i-th catalyst layer is greater than a preset efficiency, shortening the soot blowing time of the i-th catalyst layer based on a set shortening coefficient; wherein i is any one of the catalyst layers; If the sootblowing efficiency of the jth catalyst layer is less than or equal to the preset efficiency, the sootblowing time of any one of the catalyst layers is extended based on the set extension coefficient, where j is any one of the catalyst layers and i is not equal to j.

[0015] According to the acoustic wave integration method for SCR denitration temperature measurement and soot blowing provided by the present invention, the data analysis device is further used to: A current temperature measurement and sootblowing cycle of each catalyst layer is determined according to the deterioration index of each catalyst layer.

[0016] According to the present invention, an acoustic wave integrated method for SCR denitration temperature measurement and soot blowing is provided, wherein the acoustic wave soot blowing temperature measurement device further comprises a frame; The sound wave generator and the sound wave receiver are arranged on the frame; The acoustic wave generator includes an air inlet pipe, an air chamber, a flange, a resonance reed and a sound amplifier, and the sootblowing controller and the temperature measuring controller are arranged between the air chamber and the flange; The sound wave receiver includes a sound wave sensor, a horn-shaped receiver and a cavity connector; wherein, the sound wave sensor is arranged inside the horn-shaped receiver, one end of the horn-shaped receiver is connected to one end of the cavity connector, the other end of the cavity connector is arranged on the frame, and the data acquisition device is arranged inside the cavity connector.

[0017] According to an acoustic wave integrated method for SCR denitration temperature measurement and soot blowing provided by the present invention, the soot blowing frequency of each catalyst layer decreases from close to the flue gas inlet to away from the flue gas inlet.

[0018] According to an acoustic wave integration method for SCR denitration temperature measurement and soot blowing provided by the present invention, the data analysis device includes a human-computer interaction component; The human-computer interaction component is used to achieve human control of data analysis results and decision control.

[0019] On the other hand, the present invention also provides a control method for an acoustic wave integrated system for SCR denitration temperature measurement and soot blowing, which is used in any of the acoustic wave integrated systems described above, and the method comprises: Obtaining an acoustic wave reflection signal through an acoustic wave receiver in the acoustic wave integrated system; The data acquisition device in the acoustic wave integration system converts the acoustic wave reflection signal of the acoustic wave receiver to obtain a conversion signal, and sends the converted signal to the data analysis device in the acoustic wave integration system; The data analysis device generates a temperature measurement and sootblowing control strategy based on the conversion signal, and sends control instructions to the sootblowing controller in the acoustic wave integrated system and the temperature measurement controller in the acoustic wave integrated system to control the acoustic wave sootblowing and temperature measurement device to measure the temperature or sootblowing the corresponding catalyst layer.

[0020] The present invention provides an integrated acoustic wave system and method for SCR denitrification temperature measurement and sootblowing. This system optimizes the layout and connection of the equipment in terms of design, forming an integrated device that integrates temperature measurement and sootblowing. It also generates a temperature measurement and sootblowing control strategy based on the conversion signal obtained by the data acquisition device, and sends control instructions to the sootblowing controller and the temperature measurement controller to control the acoustic wave sootblowing and temperature measurement device to measure the temperature or blow soot on the corresponding catalyst layer. This enables the coordinated operation of the two functions of the intelligent control system, optimizes the control of the sootblower to blow soot on demand, reduces tube wall wear and steam and electricity consumption losses caused by unreasonable sootblowing, and ensures catalyst performance and extends its life. The technical solution of the present invention can achieve precise temperature monitoring and efficient sootblowing, improving the operating efficiency and safety of the SCR system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is one of the structural schematic diagrams of the acoustic wave integrated system for SCR denitration temperature measurement and soot blowing provided by an embodiment of the present invention; Figure 2 This is the second structural schematic diagram of the acoustic wave integrated system for SCR denitration temperature measurement and soot blowing provided by an embodiment of the present invention; Figure 3 yes Figure 2 Schematic diagram of the structure of the integrated device of medium-wave temperature measurement and soot blowing; Figure 4 It is a flow chart of a control method of an acoustic wave integrated system for SCR denitration temperature measurement and soot blowing provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] Figure 1 This is one of the structural diagrams of the acoustic wave integrated system for SCR denitration temperature measurement and soot blowing provided by the embodiment of the present invention. Figure 1 As shown, the system may include an SCR reactor 3, an acoustic sootblowing temperature measurement device 1, a data acquisition device 2, and a data analysis device 4. The SCR reactor 3 is provided with multiple catalyst layers, each with a corresponding acoustic sootblowing temperature measurement device 1. This allows temperature measurement or sootblowing to be performed on each catalyst layer. The data analysis device 4 includes a human-computer interaction component 41, which is used to implement human control of data analysis results and decision-making. The human-computer interaction component 41 is shown separately from the data analysis device 4 in the figure.

[0025] Continue to see Figure 1 The acoustic sootblowing and temperature measurement device 1 includes a sootblowing controller 25, a temperature measurement controller 24, a soot generator 7 and a soot receiver 19; wherein the sootblowing controller 25 and the temperature measurement controller 24 are respectively connected to the soot generator 7; the data acquisition device 2 is connected to the soot receiver 19 and the data analysis device 4; the data analysis device 4 is also connected to the sootblowing controller 25 and the temperature measurement controller 24.

[0026] In a specific implementation process, after the acoustic wave generator 7 emits an acoustic wave emission signal, the acoustic wave receiver 19 receives the acoustic wave reflection signal, and the acoustic wave reflection signal is converted by the data acquisition device 2 to obtain a conversion signal, which is sent to the data analysis device 4, so that the data analysis device 4 generates a temperature measurement and soot blowing control strategy according to the conversion signal, and sends control instructions to the soot blowing controller 25 and the temperature measurement controller 24 to control the acoustic wave soot blowing and temperature measurement device 1 to measure the temperature or soot of the corresponding catalyst layer.

[0027] In a specific implementation process, the use of acoustic wave temperature measurement is a non-contact measurement. At the same time, the acoustic wave signal has the advantages of high measurement accuracy, wide temperature measurement range, strong anti-interference ability, and is not affected by high temperature and corrosive media. It can effectively solve the temperature measurement problem of high-temperature equipment and improve the temperature detection accuracy of the SCR denitrification system. Compared with the optical fiber thermometer, it has a simple structure and low cost.

[0028] In one specific implementation, the conversion signal obtained by the data acquisition device 2 includes at least one of acoustic wave propagation time, acoustic wave attenuation, and acoustic wave reflection intensity. The data analysis device 4 can determine temperature data and dust accumulation data for each catalyst layer based on at least one of the acoustic wave propagation time, acoustic wave attenuation, and acoustic wave reflection intensity. The temperature data for each catalyst layer includes the real-time temperature of each catalyst layer, and the dust accumulation data for each catalyst layer includes the pressure difference of each catalyst layer.

[0029] Specifically, the real-time temperature of each catalyst layer can be calculated using the sound wave propagation time, sound wave attenuation, and sound wave reflection intensity according to existing relevant algorithms, which will not be described in detail here. After obtaining the real-time temperature of each catalyst layer, the real-time temperature can be further used in combination with the sound wave propagation time and sound wave attenuation to obtain the pressure difference of each catalyst layer. The pressure difference of each catalyst layer can be calculated according to the pressure difference calculation formula:

[0030] in, represents the pressure difference of each catalyst layer, It represents the difference between the SCR inlet flow rate and the outlet flow rate. Represents the speed of sound wave propagation, which can be obtained based on the sound wave propagation time and distance. represents the catalytic efficiency loss of each catalyst layer, Indicates the real-time temperature of each catalyst layer, represents the first fitting coefficient, which is a constant. Represents the second fitting coefficient, which is a constant.

[0031] The data analysis device 4 can further determine the deterioration index of each catalyst layer based on the temperature data of each catalyst layer, the dust accumulation data of each catalyst layer and the catalytic efficiency of each catalyst layer; wherein, the catalytic efficiency of each catalyst layer can be obtained by the difference between the SCR inlet concentration and the outlet concentration to obtain the total catalytic efficiency, and the product of the total catalytic efficiency and the sound wave attenuation degree of each layer is used as the catalytic efficiency of each catalyst layer.

[0032] Specifically, the temperature deviation of each catalyst layer can be determined based on the real-time temperature of each catalyst layer and the set temperature of each catalyst layer; the pressure difference change rate of each catalyst layer can be determined based on the pressure difference of each catalyst layer and the maximum allowable pressure difference of each catalyst layer; the catalytic efficiency loss of each catalyst layer can be determined based on the catalytic efficiency of each catalyst layer and the preset efficiency of each catalyst layer; the deterioration index of each catalyst layer can be determined based on the temperature deviation of each catalyst layer, the pressure difference change rate of each catalyst layer, the catalytic efficiency loss of each catalyst layer and their respective weights.

[0033] After obtaining the deterioration index of each catalyst layer, the temperature measurement time and soot blowing time in the current temperature measurement and soot blowing cycle of each catalyst layer can be determined as the temperature measurement and soot blowing control strategy according to the deterioration index of each catalyst layer.

[0034] Specifically, the proportion of the soot blowing time can be determined based on the pressure difference change rate of each catalyst layer, the catalytic efficiency loss of each catalyst layer, the respective weights and the deterioration index of each catalyst layer; the soot blowing time can be determined based on the proportion and the current temperature measurement soot blowing cycle; the temperature measurement time can be determined based on the soot blowing time and the current temperature measurement soot blowing cycle.

[0035] Specifically, it can be implemented by referring to the following time allocation calculation formula:

[0036] in, Indicates the soot blowing time, Indicates the current temperature measurement and soot blowing cycle. Indicates the temperature measurement time. represents the weight of the pressure difference change rate of each catalyst layer, Indicates the maximum allowable pressure difference of each catalyst layer, represents the weight of the catalytic efficiency loss of each catalyst layer, represents the catalytic efficiency of each catalyst layer, represents the preset efficiency of each catalyst layer, Indicates the deterioration index of each catalyst layer.

[0037] In a specific implementation process, the soot blowing efficiency of each catalyst layer can also be determined in real time; if the soot blowing efficiency of the i-th catalyst layer is greater than the preset efficiency, it means that the soot blowing effect is better. At this time, the soot blowing time of the i-th catalyst layer can be shortened based on the set shortening coefficient; wherein, i is any one of each catalyst layer; if the soot blowing efficiency of the j-th catalyst layer is less than or equal to the preset efficiency, it means that the soot blowing effect is poor. At this time, the soot blowing time of any one catalyst layer can be extended based on the set extension coefficient, wherein, j is any one of each catalyst layer, and i is not equal to j.

[0038] In a specific implementation, the current temperature measurement and sootblowing cycle for each catalyst layer can also be determined based on the deterioration index of each catalyst layer, thereby dynamically adjusting the current temperature measurement and sootblowing cycle. Specifically, if the deterioration index of the catalyst layer increases, the temperature measurement and sootblowing cycle can be shortened, thereby increasing the sootblowing frequency. If the deterioration index of the catalyst layer decreases, the temperature measurement and sootblowing cycle can be appropriately extended, thereby reducing the sootblowing frequency.

[0039] Among them, it can be obtained according to the following dynamic period adjustment calculation formula:

[0040] in, Indicates the reference temperature sootblowing cycle, represents the proportionality coefficient, Represents the integral coefficient.

[0041] Figure 2 This is the second structural diagram of the acoustic wave integrated system for SCR denitration temperature measurement and soot blowing provided by an embodiment of the present invention. Figure 3 yes Figure 2 Schematic diagram of the structure of the integrated device of medium-wave temperature measurement and soot blowing. Figures 2 to 3 As shown, the system can also include a flue gas rectifier 5, a catalyst layer 6, an acoustic wave generator 7, an acoustic wave air intake regulating valve 8, an air preheater 9, a catalyst layer air intake valve 10, an instrument air intake valve 11, a check valve 12, a manual door 13 in front of the safety valve, a safety valve 14, a filter 15, a pressure regulating tank outlet door 16, a compressed air pressure regulating tank 17, a mounting frame 18, an acoustic wave receiver 19, a sensor 20, a horn-shaped receiver 21, an air intake pipe 22, an air chamber 23, a temperature measuring controller 24, a soot blowing controller 25, a flange 26, a resonance reed 27, and a loudspeaker 28.

[0042] In a specific implementation process, the flue gas sprayed with ammonia enters the SCR reactor 3, passes through the flue gas rectifier 5 and the three-layer catalyst layer 6 in turn for denitrification treatment, and the flue gas after denitrification enters the air preheater 9. The SCR reactor 3 adopts a fixed bed form, and the catalyst layer 6 is placed in a module, and the layout method is to arrange the ABC three-layer catalyst layer 6. Above the top catalyst layer is a catalyst-free rectifier layer, whose function is to ensure that the flue gas is evenly distributed when entering the catalyst layer 6. A spare space is set under the second catalyst layer so that the third catalyst layer can be added when the catalyst activity decreases. The soot blowing frequency of the first layer of catalyst is higher than that of the second and third layers, which can better remove the accumulated dust on the catalysts of different layers. An ash hopper is provided under the reactor, which is connected to the ash discharge system for regular ash discharge.

[0043] Compressed air enters the compressed air surge tank 17 through the instrument air inlet valve 11 and the check valve 12. The compressed air surge tank 17 is equipped with a manual door 13 and a safety valve 14. The compressed air then passes through the filter 15, the surge tank outlet door 16, the catalyst layer inlet valve 10, and the acoustic wave inlet regulating valve 8, and enters the acoustic wave generator 7 of the acoustic wave system arranged in different catalyst layers 6 in layers and on different walls as the air source.

[0044] like Figure 3The integrated device shown is composed primarily of an acoustic wave generator 7 and an acoustic wave receiver 19, connected by a heat-resistant metal mounting frame 18. It also includes a sensor 20, a horn-shaped receiver 21, an air inlet pipe 22, an air chamber 23, a temperature measurement controller 24, a sootblowing controller 25, a flange 26, a resonant reed 27, and a megaphone 28. The acoustic wave receiver 19 receives sound waves through the horn-shaped receiver 21. This highly sensitive acoustic wave sensor, employing a piezoelectric or capacitive transducer, receives the reflected acoustic wave signal. The receiver can detect weak reflected signals and convert them into electrical signals. A signal processing module analyzes parameters such as the propagation time and attenuation of the acoustic waves to achieve temperature measurement. The sensor 20 housing is constructed of high-temperature and corrosion-resistant materials, achieving an IP65 rating or higher to withstand harsh operating conditions. The acoustic wave receiver 19 integrates a signal amplifier, filter, and analog-to-digital converter (ADC). The signal amplifier amplifies the weak received acoustic signal to a processable voltage range; the filter removes noise interference and extracts signals of specific frequencies; and the analog-to-digital converter converts the analog signal into a digital signal, which is transmitted to the control unit for further processing. The acoustic wave generator 7 comprises an air inlet pipe 22, an air chamber 23, a temperature controller 24, a sootblowing controller 25, a flange 26, a resonant reed 27, and a loudspeaker 28. The temperature controller 24 is responsible for receiving and processing the signal from the acoustic wave receiving module, calculating the flue gas temperature, and determining whether to activate the sootblowing function based on this temperature data. In temperature measurement mode, the temperature controller 24 operates, controlling the system to send a low-frequency drive signal, generating acoustic waves suitable for temperature measurement. In sootblowing mode, the sootblowing controller 25 controls the system to send a high-frequency drive signal, generating high-intensity sootblowing acoustic waves. The acoustic wave generator 7 is connected to an external compressed air pipeline, which connects to the compressed air buffer tank through the air inlet pipe 22 and the acoustic wave inlet regulating valve 8.

[0045] Furthermore, the installation position and angle of the acoustic wave transmitters and receivers 19 involved in the present invention can be optimized based on the geometry of the SCR system to ensure that acoustic waves cover critical areas. The number of acoustic wave transmitters and receivers can be increased in specific locations, depending on the specific structure and actual operating conditions of the SCR reactor 3. For example, in areas within the reactor prone to flue gas deflection, eddy currents, or ash accumulation, the density of temperature measurement devices can be appropriately increased to more accurately monitor temperature changes in these areas and enable timely adjustments and treatments.

[0046] In a specific implementation process, corresponding shielding measures can be taken and the signal processing algorithm can be optimized to cope with the possible impact of electromagnetic interference and mechanical vibration on the measurement of acoustic signals under complex working conditions.

[0047] In a specific implementation process, a temperature display and alarm unit can also be added to display temperature data in real time and alarm in abnormal situations such as over-temperature.

[0048] In a specific implementation process, the sound wave generator 7 can adopt high-performance piezoelectric ceramic materials or electromagnetic drive devices, which can emit sound waves of different frequencies and intensities according to the control signal. Piezoelectric ceramic materials have high energy conversion efficiency and good frequency response characteristics, and can quickly switch frequency and intensity according to the input signal. The electromagnetic drive device generates sound waves through the interaction between the coil and the magnet, which is suitable for high-frequency, high-intensity soot blowing mode. The soot blowing diaphragm adopts a titanium alloy diaphragm, which is not easy to fatigue and fracture under high-frequency vibration, and has good resistance to corrosive flue gases such as acidic and alkaline gases, ensuring the continuous and stable soot blowing effect. The transmitter housing is made of high-temperature resistant and corrosion-resistant alloy materials to adapt to the high temperature and high dust environment in the SCR system of the thermal power plant.

[0049] The sound wave generator 7 has an external air source connected to the supercharger, and the supercharger is connected to the sound wave generator 7. The sound wave generator 7 uses the air pressurized by the supercharger to emit pulse sound waves.

[0050] This acoustic wave transmitter integrates a frequency controller and a power amplifier. The frequency controller uses a digital signal processor (DSP) to achieve precise frequency adjustment, covering a wide range of frequencies from low to high. In temperature measurement mode, the acoustic wave energy is moderate, allowing it to penetrate the flue gas and produce a stable reflection signal. In soot blowing mode, the high-intensity acoustic wave generates sufficient vibration energy to loosen and dislodge accumulated soot. The power amplifier adjusts the acoustic wave intensity based on the control signal to ensure optimal performance in each mode. The acoustic wave frequency for temperature measurement is typically between 100Hz and 500Hz. Low-frequency acoustic waves are suitable for large-scale temperature monitoring, while high-frequency acoustic waves are suitable for localized, high-precision measurements. Adjustable frequency technology provides greater flexibility. The acoustic wave frequency for soot blowing is typically between 75Hz and 250Hz. Low-frequency acoustic waves have a longer wavelength, travel farther, and are less susceptible to absorption, making them suitable for large-scale soot cleaning. The specific frequency can be adjusted based on actual soot accumulation and equipment requirements to achieve optimal soot blowing results.

[0051] In a specific implementation, the acoustic wave receiver 19 is composed of a highly sensitive acoustic wave sensor 20, which uses a piezoelectric or capacitive transducer to receive reflected acoustic wave signals. The acoustic wave receiver 19 can detect weak reflected signals and convert them into electrical signals. The signal processing module analyzes parameters such as the propagation time and attenuation of the acoustic wave to achieve temperature measurement. The sensor 20 housing is made of high-temperature and corrosion-resistant materials, with a protection level of IP65 or above to withstand harsh operating conditions. The acoustic wave receiver 19 integrates a signal amplifier, a filter, and an analog-to-digital converter (ADC). The signal amplifier amplifies the received weak acoustic wave signal to a processable voltage range; the filter is used to remove noise interference and extract signals of specific frequencies; and the ADC converts the analog signal into a digital signal, which is transmitted to the control unit for further processing.

[0052] The acoustic receiver 19 is mounted opposite the acoustic transmitter, forming a complete acoustic transmission and reflection path. The receiver is secured to the reactor's inner wall using a dedicated bracket, with the mounting angle matching the transmitter to ensure optimal reception. A shielded cable connects the acoustic receiver 19 to the data acquisition device 2, ensuring signal integrity.

[0053] In a specific implementation process, a compressed air buffer tank is provided on the compressed air pipeline to stabilize the air source pressure and flow.

[0054] In a specific implementation, the integrated acoustic temperature measurement and sootblowing system is divided into multiple parallel units with identical structures and made of high-temperature and wear-resistant materials. These identical units are staggered in opposite directions to mitigate the risk of acoustic power attenuation caused by excessive axial travel, ensuring sufficient cleaning power in each area.

[0055] The acoustic wave integrated system for SCR denitrification temperature measurement and soot blowing of this embodiment optimizes the equipment layout and connection from the design perspective, forming an integrated device for temperature measurement and soot blowing. It also generates a temperature measurement and soot blowing control strategy based on the conversion signal obtained by the data acquisition device 2, and sends control instructions to the soot blowing controller 25 and the temperature measurement controller 24 to control the acoustic wave soot blowing and temperature measurement device 1 to measure the temperature or soot blow the corresponding catalyst layer 6. This realizes the coordinated operation of the two functions of the intelligent control system, optimizes the control of the soot blower to blow soot on demand, reduces the pipe wall wear and steam power consumption loss caused by unreasonable soot blowing, and ensures the performance of the catalyst and extends its life. The technical solution of the present invention can achieve accurate temperature monitoring and efficient soot blowing, improving the operating efficiency and safety of the SCR system.

[0056] Based on the same general inventive concept, the present invention also protects a control method for an SCR denitrification temperature measurement and soot blowing acoustic wave integrated system. The control method for the SCR denitrification temperature measurement and soot blowing acoustic wave integrated system provided by the present invention is described below. The control method for the SCR denitrification temperature measurement and soot blowing acoustic wave integrated system described below and the acoustic wave integrated system for SCR denitrification temperature measurement and soot blowing described above can be referenced to each other.

[0057] Figure 4 Schematic diagram of the control method of the acoustic wave integrated system for SCR denitration temperature measurement and soot blowing provided by an embodiment of the present invention; Figure 4 As shown, the method may include the following steps: 401. Obtaining an acoustic wave reflection signal through an acoustic wave receiver in the acoustic wave integration system; 402. Convert the acoustic wave reflection signal of the acoustic wave receiver by a data acquisition device in the acoustic wave integration system to obtain a conversion signal, and send the converted signal to a data analysis device in the acoustic wave integration system; 403. Generate a temperature measurement and sootblowing control strategy based on the conversion signal through the data analysis device, and send control instructions to the sootblowing controller in the acoustic wave integrated system and the temperature measurement controller in the acoustic wave integrated system to control the acoustic wave sootblowing and temperature measurement device to measure the temperature or blow soot on the corresponding catalyst layer.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An integrated acoustic wave system for SCR denitration temperature measurement and soot blowing, characterized in that: It includes SCR reactor, sonic soot blowing temperature measuring device, data acquisition device and data analysis device; The SCR reactor is provided with a plurality of catalyst layers; The sonic sootblowing temperature measurement device includes a sootblowing controller, a temperature measurement controller, a sonic wave generator, and a sonic wave receiver; wherein the sonic sootblowing temperature measurement device is arranged corresponding to the multiple catalyst layers; the sootblowing controller and the temperature measurement controller are respectively connected to the sonic wave generator; The data acquisition device is connected to the acoustic wave receiver and the data analysis device; the data analysis device is also connected to the soot blowing controller and the temperature measurement controller; The data acquisition device converts the acoustic wave reflection signal of the acoustic wave receiver to obtain a conversion signal, and sends it to the data analysis device. The data analysis device generates a temperature measurement and sootblowing control strategy based on the conversion signal, and sends control instructions to the sootblowing controller and the temperature measurement controller to control the acoustic wave sootblowing and temperature measurement device to measure the temperature or blow soot on the corresponding catalyst layer.

2. The acoustic wave integrated system for SCR denitration temperature measurement and soot blowing according to claim 1 is characterized in that: The conversion signal includes at least one of the acoustic wave propagation time, the acoustic wave attenuation degree and the acoustic wave reflection intensity; the data acquisition device is also used to obtain the catalytic efficiency of each catalyst layer; The data analysis device is specifically used for: determining temperature data of each catalyst layer and dust accumulation data of each catalyst layer according to at least one of the sound wave propagation time, the sound wave attenuation degree, and the sound wave reflection intensity; determining a deterioration index of each catalyst layer according to the temperature data of each catalyst layer, the dust accumulation data of each catalyst layer, and the catalytic efficiency of each catalyst layer; According to the deterioration index of each catalyst layer, the temperature measurement time and the soot blowing time in the current temperature measurement and soot blowing cycle of each catalyst layer are determined as the temperature measurement and soot blowing control strategy.

3. The acoustic wave integrated system for SCR denitration temperature measurement and soot blowing according to claim 2 is characterized in that: The temperature data of each catalyst layer includes the real-time temperature of each catalyst layer, and the dust accumulation data of each catalyst layer includes the pressure difference of each catalyst layer; The data analysis device is also used for: determining a temperature deviation of each catalyst layer according to the real-time temperature of each catalyst layer and the set temperature of each catalyst layer; determining a pressure difference change rate of each catalyst layer according to the pressure difference of each catalyst layer and the maximum allowable pressure difference of each catalyst layer; determining a catalytic efficiency loss of each catalyst layer according to the catalytic efficiency of each catalyst layer and a preset efficiency of each catalyst layer; A deterioration index of each catalyst layer is determined according to the temperature deviation of each catalyst layer, the pressure difference change rate of each catalyst layer, the catalytic efficiency loss of each catalyst layer, and their respective weights.

4. The acoustic wave integrated system for SCR denitration temperature measurement and soot blowing according to claim 3 is characterized in that: The data analysis device is also used for: determining the proportion of the sootblowing time according to the pressure difference change rate of each catalyst layer, the catalytic efficiency loss of each catalyst layer, their respective weights, and the deterioration index of each catalyst layer; Determining the soot blowing time according to the proportion and the current temperature measurement soot blowing cycle; The temperature measurement time is determined according to the soot blowing time and the current temperature measurement soot blowing cycle.

5. The acoustic wave integrated system for SCR denitration temperature measurement and soot blowing according to claim 3 is characterized in that: The data analysis device is also used for: determining a sootblowing efficiency of each catalyst layer; If the soot blowing efficiency of the i-th catalyst layer is greater than a preset efficiency, shortening the soot blowing time of the i-th catalyst layer based on a set shortening coefficient; wherein i is any one of the catalyst layers; If the sootblowing efficiency of the jth catalyst layer is less than or equal to the preset efficiency, the sootblowing time of any one of the catalyst layers is extended based on the set extension coefficient, where j is any one of the catalyst layers and i is not equal to j.

6. The acoustic wave integrated system for SCR denitration temperature measurement and soot blowing according to claim 2, characterized in that: The data analysis device is also used for: A current temperature measurement and sootblowing cycle of each catalyst layer is determined according to the deterioration index of each catalyst layer.

7. The acoustic wave integrated system for SCR denitration temperature measurement and soot blowing according to any one of claims 1 to 6, characterized in that: The acoustic wave sootblowing temperature measurement device also includes a frame; The sound wave generator and the sound wave receiver are arranged on the frame; The acoustic wave generator includes an air inlet pipe, an air chamber, a flange, a resonance reed and a sound amplifier, and the sootblowing controller and the temperature measuring controller are arranged between the air chamber and the flange; The sound wave receiver includes a sound wave sensor, a horn-shaped receiver and a cavity connector; wherein, the sound wave sensor is arranged inside the horn-shaped receiver, one end of the horn-shaped receiver is connected to one end of the cavity connector, the other end of the cavity connector is arranged on the frame, and the data acquisition device is arranged inside the cavity connector.

8. The acoustic wave integrated system for SCR denitration temperature measurement and soot blowing according to any one of claims 1 to 6, characterized in that: The soot blowing frequency of each catalyst layer decreases from the direction close to the flue gas inlet to the direction far away from the flue gas inlet.

9. The acoustic wave integrated system for SCR denitration temperature measurement and soot blowing according to any one of claims 1 to 6, characterized in that: The data analysis device includes a human-computer interaction component; The human-computer interaction component is used to achieve human control of data analysis results and decision control.

10. A control method for an SCR denitration temperature measurement and soot blowing acoustic wave integrated system, characterized in that: For use in an acoustic wave integration system according to any one of claims 1 to 9, the method comprising: Obtaining an acoustic wave reflection signal through an acoustic wave receiver in the acoustic wave integrated system; The data acquisition device in the acoustic wave integration system converts the acoustic wave reflection signal of the acoustic wave receiver to obtain a conversion signal, and sends the converted signal to the data analysis device in the acoustic wave integration system; The data analysis device generates a temperature measurement and sootblowing control strategy based on the conversion signal, and sends control instructions to the sootblowing controller in the acoustic wave integrated system and the temperature measurement controller in the acoustic wave integrated system to control the acoustic wave sootblowing and temperature measurement device to measure the temperature or sootblowing the corresponding catalyst layer.

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