CN110646112A - Ultrasonic industrial furnace temperature measurement system and method based on multiple sound source arrangement modes - Google Patents
Ultrasonic industrial furnace temperature measurement system and method based on multiple sound source arrangement modes Download PDFInfo
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- CN110646112A CN110646112A CN201910930268.8A CN201910930268A CN110646112A CN 110646112 A CN110646112 A CN 110646112A CN 201910930268 A CN201910930268 A CN 201910930268A CN 110646112 A CN110646112 A CN 110646112A
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
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Abstract
The invention provides a system and a method for measuring temperature of an ultrasonic industrial furnace based on a plurality of sound source arrangement modes, and relates to the technical field of acoustic temperature measurement. The system comprises an ultrasonic transmitter, an ultrasonic receiver, an ultrasonic transmitting/receiving module, an ash blowing cooler, a high-temperature alarm protector, an STM32 microprocessor, an LCD display and a PC; the method is characterized in that 8 pairs of ultrasonic wave transmitting/receiving devices are arranged on the periphery of one section of a furnace wall, the same amount of ultrasonic wave transmitting/receiving devices are arranged on different sections in the same mode, each acoustic wave transmitting/receiving device is sequentially started and stopped in a detection period according to a set program, a group of acoustic wave propagation time values are obtained, and temperature distribution on the section of a temperature field is reconstructed through a once reconstruction algorithm. The ultrasonic wave is used as a signal source, so that background noise interference of the hearth of the industrial furnace is reduced, the faster response time advantage of the ultrasonic wave is utilized, the flight time of the sound wave temperature measurement signal is accurately measured, and an accurate temperature field in the industrial furnace is obtained.
Description
Technical Field
The invention relates to the technical field of acoustic temperature measurement, in particular to a temperature measurement system and method for an ultrasonic industrial furnace based on a plurality of sound source arrangement modes.
Background
Complex temperature fields exist in the industry in a variety of devices for combustion or heating. In industrial furnaces of the metallurgical and other industries, the industrial furnace hearth is a complex reaction site in which complex chemical reactions and physical changes are carried out, accompanied by transient changes in temperature. The temperature is one of the most important parameters of thermal equipment and a thermal system, the distribution of the temperature field can be used for measuring the stability and the economical efficiency of combustion, and the change of the temperature field directly influences the combustion and the burnout of fuel and the safe and stable operation of an industrial furnace. The temperature field with reasonable organization is beneficial to the combustion and the burnout of fuel, the heat economy and the heat stability of the industrial furnace are ensured, the utilization rate of energy is improved, and the formation of sulfide and nitrogen oxide is reduced, thereby reducing the emission of pollutants.
For furnace and kiln equipment, it is very important to accurately measure the distribution of the temperature field in the furnace to improve the economy and safety of large industrial furnace equipment. Along with the increase of the national attention on energy consumption and environmental protection problems, how to improve the economical efficiency and safety of the operation of industrial furnace equipment and reduce NOxAnd the problem of pollutant emission needs to be solved. These problems are closely related to the combustion conditions, so that real-time and accurate measurement of the combustion temperature becomes a key point for solving the problems. The combustion process of industrial furnace equipment has the characteristics of random turbulence, high-temperature corrosion, temperature transient change, background noise in the furnace and the like, so that certain difficulty is brought to accurate real-time measurement of temperature field parameters. However, most of the conventional furnace temperature measuring methods are contact-type measuring methods, which put higher requirements on materials of measuring instruments, and the conventional contact-type measuring methods have certain problems in reliability and accuracy, so that certain errors exist in the obtained combustion parameters, and accurate control of a temperature field is hindered. Therefore, finding a simple and accurate measurement method becomes the key to solve the problem.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an ultrasonic industrial furnace temperature measuring system and method based on a plurality of sound source arrangement modes aiming at the defects of the prior art, and the temperature of the industrial furnace is measured by ultrasonic waves.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: on one hand, the invention provides an ultrasonic industrial furnace temperature measurement system based on a plurality of sound source arrangement modes, which comprises a plurality of ultrasonic transmitters, a plurality of ultrasonic receivers, an ultrasonic transmitting/receiving module, an ash blowing cooler, a high-temperature alarm protector, a microprocessor, an LCD display and a PC; the ultrasonic transmitter and the ultrasonic receiver are respectively connected with the ultrasonic transmitting module and the ultrasonic receiving module, and the ultrasonic transmitting/receiving module, the ash blowing cooler, the high-temperature alarm protector, the LCD display and the PC are respectively connected with the microprocessor;
the ultrasonic transmitter is used for transmitting an amplified ultrasonic temperature measurement signal;
the ultrasonic receiver is used for receiving an ultrasonic temperature measurement signal returned by the industrial furnace;
the ultrasonic transmitting/receiving module is used for amplifying and filtering signals; the ultrasonic transmitting/receiving module comprises an amplifying circuit and a filtering circuit; the ash blowing cooler is used for cleaning sound wave guide pipes in the ultrasonic transmitter and the ultrasonic receiver;
the high-temperature alarm protector is used for giving an alarm when the temperatures of the ultrasonic transmitter and the ultrasonic receiver reach the set protection temperature;
the microprocessor is used for controlling the ultrasonic transmitter, the ultrasonic receiver, the ash blowing cooler and the high-temperature alarm protector;
the LCD is used for displaying real-time ultrasonic signal waveform and temperature measurement results;
the PC is used for calculating the flight time of the ultrasonic waves by using a correlation analysis algorithm, calculating an average temperature value on an ultrasonic wave path according to a certain algorithm, and simultaneously setting and calibrating the whole system;
the setting and calibration comprises setting of a calculation algorithm built in the PC and calibration of circuit connection of the microprocessor and other modules;
preferably, the plurality of ultrasonic transmitters and the plurality of ultrasonic receivers are arranged in pairs around the furnace wall.
Preferably, 8 pairs of ultrasonic transmitters and ultrasonic receivers are arranged on one cross section of the furnace wall of the industrial furnace in an axisymmetric mode, and the temperature field on the cross section is averagely divided into 16 small areas and 24 independent sound emission and receiving paths.
Preferably, the same 8 pairs of ultrasonic transmitters and ultrasonic receivers are respectively arranged on different parallel cross sections of the industrial furnace in an axisymmetric mode, the ultrasonic transmitters and the ultrasonic receivers on the different parallel cross sections can transmit and receive ultrasonic signals from other cross sections, and each acoustic transmitter and each ultrasonic receiver are sequentially turned on and off in one temperature measurement period on the different cross sections to obtain a group of ultrasonic propagation time values.
On the other hand, the invention also provides an ultrasonic industrial furnace temperature measurement method based on a plurality of sound source arrangement modes, and the measurement in one period comprises the following steps:
step 1, resetting all built-in counters by a microprocessor, and waiting for a temperature measuring system to start working;
step 2, when the combustion of the industrial furnace starts, a P1.0 port of the microprocessor generates a pulse signal with the frequency of 40KHz, the pulse signal is amplified by an ultrasonic emission driving circuit of the ultrasonic emission module and then an ultrasonic probe of the ultrasonic emitter is excited to emit an ultrasonic pulse signal, and the recording time of the system at the moment is t1Meanwhile, a pulse signal of the microprocessor starts a counter through a trigger to sample ultrasonic pulse counting;
step 3, when the port P1.1 of the microprocessor detects a high level, an ultrasonic return signal penetrating through a fixed gas medium distance D is received, and the system records time t at the moment2The microprocessor turns off the counter through the trigger, and then the P1.1 port sends out two continuous pulses, the first pulseThe count value in the counter is stored in a storage, the second pulse is used for resetting the counter to prepare for counting for the next time, and meanwhile, the ultrasonic receiver receives a pulse signal received by the probe to trigger the transmitting probe of the next ultrasonic transmitter to transmit the next ultrasonic pulse signal;
step 4, the pulse signal received by the ultrasonic receiver is filtered, gain-amplified, sent to the microprocessor, and then sent to the PC through the microprocessor, and the time t recorded by the system in the PC is used as the time t1And t2Calculating the flight time of the ultrasonic wave emitted by the ultrasonic transmitter as tau-t2-t1According to the relationship between the time of flight τ of the ultrasonic wave and the temperature T of the medium
Calculating the medium temperature, namely reconstructing a temperature field in the industrial furnace in a PC (personal computer), wherein Z is a sound wave propagation medium constant, and D is the distance of sound wave propagation, namely the distance from the ultrasonic transmitter to the ultrasonic receiver;
and 5, repeating the steps 1-4 in different sections of the industrial furnace, and establishing a three-dimensional temperature field of the industrial furnace.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the ultrasonic industrial furnace temperature measurement system and method based on the multiple sound source arrangement mode can avoid the adverse effect of noise in the furnace on the sound wave signal and accurately measure the flight time of the sound wave temperature measurement signal; the ultrasonic wave flying path can be accurately established, and the ultrasonic wave flying path covers the whole temperature field; the temperature measuring device can avoid disturbance to a temperature field caused by a contact type temperature measuring device, more accurately measure the average temperature of a certain area, and establish a three-dimensional temperature field.
Drawings
FIG. 1 is a schematic structural diagram of an ultrasonic industrial furnace temperature measurement system based on a plurality of sound source arrangement modes according to an embodiment of the present invention;
FIG. 2 is a schematic view of an ultrasonic transmitter and ultrasonic receiver arrangement on a cross section of an industrial furnace according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for measuring temperature of an ultrasonic industrial furnace based on a plurality of sound source arrangements according to an embodiment of the present invention.
In the figure: 1. an ultrasonic receiver; 2. a hearth; 3. an ultrasonic transmitter.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the embodiment, 8 sound sources are arranged as an example, and the temperature of the industrial furnace is measured by using the ultrasonic industrial furnace temperature measuring system and method based on the arrangement mode of the sound sources.
An ultrasonic industrial furnace temperature measurement system based on a plurality of sound source arrangement modes is shown in figure 1 and comprises a plurality of ultrasonic transmitters 3, a plurality of ultrasonic receivers 1, an ultrasonic transmitting/receiving module, an ash blowing cooler, a high-temperature alarm protector, a microprocessor, an LCD display and a PC; the ultrasonic transmitter 3 and the ultrasonic receiver 1 are respectively connected with an ultrasonic transmitting module and an ultrasonic receiving module, and the ultrasonic transmitting/receiving module, the ash blowing cooler, the high-temperature alarm protector, the LCD display and the PC are respectively connected with the microprocessor;
the ultrasonic transmitter 3 is used for transmitting an amplified ultrasonic temperature measurement signal;
the ultrasonic receiver 1 is used for receiving an ultrasonic temperature measurement signal returned by the industrial furnace;
the plurality of ultrasonic transmitters 3 and the plurality of ultrasonic receivers 1 are arranged in pairs around the furnace wall. 8 pairs of ultrasonic transmitters 3 and ultrasonic receivers 1 are arranged on one cross section of the furnace wall of the industrial furnace in an axisymmetric mode, the temperature field on the cross section is averagely divided into 16 small areas, and 24 independent sound emission and receiving paths are shown in figure 2. The same 8 pairs of ultrasonic transmitters 3 and ultrasonic receivers 1 are respectively arranged on different parallel sections of the industrial furnace in an axisymmetric mode, the ultrasonic transmitters 3 and the ultrasonic receivers 1 on different parallel sections can transmit and receive ultrasonic signals from other sections, and each acoustic transmitter 3 and each ultrasonic receiver 1 are sequentially opened and closed in a temperature measurement period on different sections to obtain a group of ultrasonic propagation time values.
The ultrasonic transmitting/receiving module is used for amplifying and filtering signals; the ultrasonic transmitting/receiving module comprises an amplifying circuit and a filtering circuit; the ash blowing cooler is used for cleaning sound wave guide pipes in the ultrasonic transmitter 3 and the ultrasonic receiver 1;
the high-temperature alarm protector is used for giving an alarm when the temperatures of the ultrasonic transmitter 3 and the ultrasonic receiver 1 reach the set protection temperature;
the microprocessor is used for controlling the ultrasonic transmitter 3, the ultrasonic receiver 1, the ash blowing cooler and the high-temperature alarm protector;
the LCD is used for displaying real-time ultrasonic signal waveform and temperature measurement results;
the PC is used for calculating the flight time of the ultrasonic waves by using a correlation analysis algorithm, calculating an average temperature value on an ultrasonic wave path according to a certain algorithm, and simultaneously setting and calibrating the whole system;
the setting and calibration comprises setting of a calculation algorithm built in the PC and calibration of circuit connection of the microprocessor and other modules;
in this embodiment, the microprocessor is an STM32 microprocessor.
As shown in FIG. 3, the method for measuring the temperature of the ultrasonic industrial furnace based on the arrangement mode of a plurality of sound sources comprises the following steps:
step 1, resetting all built-in counters by a microprocessor, and waiting for a temperature measuring system to start working;
step 2, when the combustion of the industrial furnace starts, a P1.0 port of the microprocessor generates a pulse signal with the frequency of 40KHz, the pulse signal is amplified by an ultrasonic emission driving circuit of the ultrasonic emission module and then an ultrasonic probe of the ultrasonic emitter is excited to emit an ultrasonic pulse signal, and the recording time of the system at the moment is t1At the same time, micro-positioningA pulse signal of the processor starts a counter through a trigger to sample ultrasonic pulse counting;
step 3, when the port P1.1 of the microprocessor detects a high level, an ultrasonic return signal penetrating through a fixed gas medium distance D is received, and the system records time t at the moment2The microprocessor closes the counter through the trigger, then the P1.1 port sends out two continuous pulses, the first pulse stores the count value in the counter into the memory, the second pulse is used for clearing the counter to prepare for counting next time, and simultaneously, the ultrasonic receiver receives the pulse signal received by the probe to trigger the transmitting probe of the next ultrasonic transmitter to transmit the next ultrasonic pulse signal;
step 4, the pulse signal received by the ultrasonic receiver is filtered, gain-amplified, sent to the microprocessor, and then sent to the PC through the microprocessor, and the time t recorded by the system in the PC is used as the time t1And t2Calculating the flight time of the ultrasonic wave emitted by the ultrasonic transmitter as tau-t2-t1According to the relationship between the time of flight τ of the ultrasonic wave and the temperature T of the medium
Calculating the medium temperature, namely reconstructing a temperature field in the industrial furnace in a PC (personal computer), wherein Z is a sound wave propagation medium constant, and D is the distance of sound wave propagation, namely the distance from the ultrasonic transmitter to the ultrasonic receiver;
and 5, repeating the steps 1-4 in different sections of the industrial furnace, and establishing a three-dimensional temperature field of the industrial furnace.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (5)
1. The utility model provides an ultrasonic wave industrial furnace temperature measurement system based on a plurality of sound source arrangement modes which characterized in that: the device comprises a plurality of ultrasonic transmitters, a plurality of ultrasonic receivers, an ultrasonic transmitting/receiving module, an ash blowing cooler, a high-temperature alarm protector, a microprocessor, an LCD display and a PC; the ultrasonic transmitter and the ultrasonic receiver are respectively connected with the ultrasonic transmitting module and the ultrasonic receiving module, and the ultrasonic transmitting module, the ultrasonic receiving module, the ash blowing cooler, the high-temperature alarm protector, the LCD display and the PC are respectively connected with the microprocessor;
the ultrasonic transmitter is used for transmitting an amplified ultrasonic temperature measurement signal;
the ultrasonic receiver is used for receiving an ultrasonic temperature measurement signal returned by the industrial furnace;
the ultrasonic transmitting/receiving module is used for amplifying and filtering signals; the ultrasonic transmitting/receiving module comprises an amplifying circuit and a filtering circuit; the ash blowing cooler is used for cleaning sound wave guide pipes in the ultrasonic transmitter and the ultrasonic receiver;
the high-temperature alarm protector is used for giving an alarm when the temperatures of the ultrasonic transmitter and the ultrasonic receiver reach the set protection temperature;
the microprocessor is used for controlling the ultrasonic transmitter, the ultrasonic receiver, the ash blowing cooler and the high-temperature alarm protector;
the LCD is used for displaying real-time ultrasonic signal waveform and temperature measurement results;
the PC is used for calculating the flight time of the ultrasonic waves by using a correlation analysis algorithm, calculating an average temperature value on an ultrasonic wave path according to a certain algorithm, and simultaneously setting and calibrating the whole system;
the setting and calibration includes setting of a calculation algorithm built in the PC and calibration of the circuit connections of the microprocessor and other modules.
2. The ultrasonic industrial furnace temperature measurement system based on the arrangement mode of the plurality of sound sources as claimed in claim 1, wherein: the plurality of ultrasonic transmitters and the plurality of ultrasonic receivers are arranged in pairs around the furnace wall.
3. The ultrasonic industrial furnace temperature measurement system based on the arrangement mode of the plurality of sound sources as claimed in claim 1, wherein: 8 pairs of ultrasonic transmitters and ultrasonic receivers are arranged on one cross section of the furnace wall of the industrial furnace in an axisymmetric mode, the temperature field on the cross section is averagely divided into 16 small areas, and 24 independent acoustic emission and receiving paths are arranged.
4. The ultrasonic industrial furnace temperature measurement system based on the arrangement mode of the plurality of sound sources according to any one of claims 1 to 3, wherein: the same 8 pairs of ultrasonic transmitters and ultrasonic receivers are respectively arranged on different parallel sections of the industrial furnace in an axisymmetric mode, the ultrasonic transmitters and the ultrasonic receivers on different parallel sections can transmit and receive ultrasonic signals from other sections, and each acoustic transmitter and each ultrasonic receiver are sequentially opened and closed in a temperature measurement period on different sections to obtain a group of ultrasonic propagation time values.
5. The ultrasonic industrial furnace temperature measurement method based on the arrangement mode of a plurality of sound sources is based on the system of claim 4 for temperature measurement, and is characterized in that: the measurement in one cycle comprises the following steps:
step 1, resetting all built-in counters by a microprocessor, and waiting for a temperature measuring system to start working;
step 2, when the combustion of the industrial furnace starts, a P1.0 port of the microprocessor generates a pulse signal with the frequency of 40KHz, the pulse signal is amplified by an ultrasonic emission driving circuit of the ultrasonic emission module and then an ultrasonic probe of the ultrasonic emitter is excited to emit an ultrasonic pulse signal, and the recording time of the system at the moment is t1Meanwhile, a pulse signal of the microprocessor starts a counter through a trigger to sample ultrasonic pulse counting;
step 3, when the port P1.1 of the microprocessor detects a high level, an ultrasonic return signal penetrating through a fixed gas medium distance D is received, and the system records time t at the moment2The microprocessor closes the counter through the trigger, then the P1.1 port sends out two continuous pulses, the first pulse stores the count value in the counter into the memory, the second pulse is used for clearing the counter to prepare for counting next time, and simultaneously, the ultrasonic receiver receives the pulse signal received by the probe to trigger the transmitting probe of the next ultrasonic transmitter to transmit the next ultrasonic pulse signal;
step 4, the pulse signal received by the ultrasonic receiver is filtered, gain-amplified, sent to the microprocessor, and then sent to the PC through the microprocessor, and the time t recorded by the system in the PC is used as the time t1And t2Calculating the flight time of the ultrasonic wave emitted by the ultrasonic transmitter as tau-t2-t1According to the relationship between the time of flight τ of the ultrasonic wave and the temperature T of the medium
Calculating the medium temperature, namely reconstructing a temperature field in the industrial furnace in a PC (personal computer), wherein Z is a sound wave propagation medium constant, and D is the distance of sound wave propagation, namely the distance from the ultrasonic transmitter to the ultrasonic receiver;
and 5, repeating the steps 1-4 in different sections of the industrial furnace, and establishing a three-dimensional temperature field of the industrial furnace.
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Application publication date: 20200103 |