CN113446593A - Boiler pressure-bearing pipeline leakage detection system - Google Patents
Boiler pressure-bearing pipeline leakage detection system Download PDFInfo
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- CN113446593A CN113446593A CN202110711865.9A CN202110711865A CN113446593A CN 113446593 A CN113446593 A CN 113446593A CN 202110711865 A CN202110711865 A CN 202110711865A CN 113446593 A CN113446593 A CN 113446593A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/38—Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
- G01M3/243—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations for pipes
Abstract
The invention provides a boiler pressure-bearing pipeline leakage detection system, which comprises a digital audio signal collector and a main control unit; the digital audio signal collector comprises a sound signal collecting module, a filtering module, a first microprocessor and a bus interface; the main control unit comprises a field bus communication interface module, a second microprocessor, an audio signal conversion circuit, an alarm module, a communication interface module and an industrial personal computer, wherein the field bus communication interface module is used for carrying out digital signal transmission with a bus interface through a field bus; the audio signal conversion circuit is connected with the analog signal of the digital audio signal collector through the audio signal exchange control module. The invention can solve the problems of untimely alarm, complex transmission line, high cost, easy interference in the signal transmission process and the like in the prior art.
Description
Technical Field
The invention relates to the technical field of boiler pressure-bearing pipeline leakage detection, in particular to a boiler pressure-bearing pipeline leakage detection system.
Background
The power supply is mainly supplied by thermal power generation, and the capacity of a thermal generator set accounts for more than 50% of that of the generator set. According to statistics, boiler accidents account for 65.8% of all equipment faults of the thermal power generation, pressure-bearing pipeline leakage accounts for 71.7% of boiler leakage accidents, and the pressure-bearing pipeline leakage accounts for 47.2% of all equipment faults of the thermal power generation. The method has the advantages that the leakage fault of the boiler pressure-bearing pipeline is detected in time, and the method plays an important role in normal, reliable, safe, economical and stable operation of a thermal power station.
At present, the main method for detecting the pressure-bearing pipeline leakage of the boiler is the traditional sound spectrum analysis method, namely a Fourier transform (Fourier) method. The traditional sound spectrum analysis method is that sound guide pipes are arranged on a plurality of measuring points of a hearth, an audio signal collector comprising a microphone and a signal amplification and conversion circuit is installed on each sound guide pipe, the audio signal collector amplifies and converts collected audio signals into current signals and transmits the current signals to a host case, a signal processing circuit of the host converts the current signals into voltage signals and transmits the voltage signals to an A/D conversion card after band-pass filtering, and an industrial personal computer performs Fourier transformation on A/D conversion results, calculates characteristic values of the audio signals and displays and alarms. This technical approach has the following disadvantages:
the traditional audio signal acquisition and conversion technology is to amplify the leakage sound and the boiler background sound in the same proportion, then carry out V-I conversion and transmit the amplified sound to a host unit in a 4-20 mA current signal mode. Because the background sound generated by the combustion of the boiler furnace is far larger than the initial leakage sound, the early leakage sound can be submerged by the background sound in the collected signals, the system cannot give an accurate detection result at the initial leakage stage, and the technical problem of untimely alarm occurs;
digital communication in a field bus mode is not realized between a host unit and an audio signal acquisition terminal of a traditional pressure-bearing pipeline leakage detection system, a 4-20 mA current signal is output to the host by the audio signal acquisition terminal, and a self-checking signal sent to the audio signal acquisition terminal by the host is transmitted through a self-checking signal line. At least 2 x n +1 signal lines (n is the number of the audio signal acquisition terminals) are arranged between the main case and the plurality of audio signal acquisition terminals in consideration of power supply or ground line service. Therefore, the transmission line is complex and costly, and interference is also introduced in the signal transmission process.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a boiler pressure-bearing pipeline leakage detection system, so as to solve the problems that the existing boiler pressure-bearing pipeline leakage detection system cannot provide an accurate detection result at the initial stage of leakage, resulting in untimely alarm, complex transmission line, high cost, and easy interference introduced in the signal transmission process.
The invention provides a boiler pressure-bearing pipeline leakage detection system, comprising: the digital audio signal collector and the main control unit; the digital audio signal collector is arranged on a pressure-bearing pipeline to be detected; the digital audio signal collector comprises: the device comprises a sound signal acquisition module, a filtering module connected with the sound signal acquisition module, a first microprocessor connected with the filtering module and a bus interface connected with the first microprocessor; the main control unit includes: the system comprises a field bus communication interface module, a second microprocessor, an audio signal conversion circuit, an alarm module, a communication interface module and an industrial personal computer, wherein the field bus communication interface module is used for carrying out digital signal transmission with the bus interface through a field bus; the audio signal conversion circuit is connected with the analog signal of the digital audio signal collector through an audio signal exchange control module. In addition, the preferred scheme is that the industrial personal computer is connected with a cloud server through a network; the cloud server is connected with the database.
In addition, the preferable scheme is that a digital audio signal collector is arranged on each pressure-bearing pipeline to be detected.
In addition, it is preferable that the sound signal collection module includes a microphone; the filtering module comprises a band-pass filter connected with the microphone and a signal conditioning circuit connected with the band-pass filter; the signal conditioning circuit is connected with the first microprocessor.
In addition, it is preferable that the sound signal collection module further includes a self-inspection module; the self-checking module comprises a buzzer driving circuit and a buzzer connected with the buzzer driving circuit; the buzzer driving circuit is connected with the first microprocessor; the buzzer is connected with the microphone.
In addition, the preferred scheme is that the main control unit further comprises a steam flow acquisition circuit; the steam flow acquisition circuit is connected with the second microprocessor.
In addition, preferably, the main control unit further includes a switching value output circuit; and the switching value output circuit is connected with the second microprocessor.
In addition, preferably, the main control unit further comprises a switching value input circuit; the switching value input circuit is connected with the second microprocessor; and the second microprocessor is connected with the distributed control system.
In addition, it is preferable that the audio signal exchange control module includes: the device comprises a third microprocessor, an analog switch connected with the third microprocessor, a sampling circuit connected with the analog switch, a voltage-current conversion circuit connected with the analog switch and a third communication interface connected with the third microprocessor; the voltage-current conversion circuit is connected with the audio signal conversion circuit; the sampling circuit is connected with the digital audio signal collector; the third communication interface is connected with the field bus.
In addition, the preferred scheme is that the first microprocessor is an embedded microprocessor; and/or the second microprocessor is an embedded microprocessor; and/or the third microprocessor is an embedded microprocessor.
According to the technical scheme, the boiler pressure-bearing pipeline leakage detection system provided by the invention can detect the characteristic value of the audio signal generated in the working process in the boiler furnace through the digital audio signal collector, and uploads the characteristic value to the main control unit in a digital form through the field bus, and the digital quantity transmission mode can improve the reliability of signal transmission and avoid the interference caused by an analog signal transmission mode; the digital audio signal collector comprises a sound signal collecting module and a filtering module connected with the sound signal collecting module, wherein the filtering module is used for filtering after collecting sound and then amplifying after filtering, so that the influence of background sound on a leakage sound collecting result can be effectively reduced, the sensitivity of detecting the leakage sound is improved, an accurate detection result is given at the initial leakage stage, and the alarm is more timely; the audio signal conversion circuit of the main control unit is connected with the analog signal of the digital audio signal collector through the audio signal exchange control module, so that the line connection can be effectively reduced, the transmission line is simplified, the cost is reduced, and the interference in the signal transmission process is avoided.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a pressure-bearing pipeline leak detection system of a boiler according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a digitized audio signal collector according to an embodiment of the invention;
FIG. 3 is a circuit diagram of a bandpass filter and signal conditioning circuit according to an embodiment of the invention;
fig. 4 is a circuit diagram of a buzzer driving circuit according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a bus interface according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a power supply circuit according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of a steam flow acquisition circuit according to an embodiment of the present invention;
FIG. 8 is a circuit diagram of an alarm module according to an embodiment of the present invention;
fig. 9 is a circuit diagram of a switching value input circuit according to an embodiment of the present invention;
FIG. 10 is a block diagram of an audio handshake control module according to an embodiment of the present invention;
FIG. 11 is a basic peripheral circuit diagram of a first microprocessor according to an embodiment of the present invention;
FIG. 12 is a basic peripheral circuit diagram of a second microprocessor according to an embodiment of the present invention.
In the figure, 1-a digital audio signal collector, 111-a microphone, 112-a buzzer driving circuit, 113-a buzzer, 121-a band-pass filter, 122-a signal conditioning circuit, 13-a first microprocessor, 14-a bus interface, 2-a main control unit, 21-a field bus communication interface module, 22-a second microprocessor, 23-an audio signal conversion circuit, 24-an alarm module, 25-a communication interface module, 26-an industrial personal computer, 27-a steam flow acquisition circuit, 28-a switching value output circuit, 3-a field bus, 4-an audio signal exchange control module, 41-a third microprocessor, 42-an analog switch, 43-a sampling circuit, 44-a voltage current conversion circuit and 45-a third communication interface, 5-cloud server.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
The boiler pressure-bearing pipeline leakage detection system is provided aiming at the problems that the prior boiler pressure-bearing pipeline leakage detection system cannot provide an accurate detection result at the initial leakage stage, so that the alarm is not timely, the transmission line is complex, the cost is high, the signal transmission process is easy to introduce interference and the like.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to illustrate the pressure-bearing pipeline leakage detection system of the boiler provided by the present invention, fig. 1 shows a block diagram structure of the pressure-bearing pipeline leakage detection system of the boiler according to an embodiment of the present invention; fig. 2 shows a schematic structure of a digitized audio signal collector according to an embodiment of the present invention.
As shown in fig. 1 and 2, the present invention provides a system for detecting a leakage of a pressure-bearing pipeline of a boiler, comprising: the digital audio signal collector 1 and the main control unit 2; the digital audio signal collector 1 is arranged on a pressure-bearing pipeline to be detected; the digitized audio signal collector 1 includes: the voice signal acquisition module, the filtering module connected with the voice signal acquisition module, the first microprocessor 13 connected with the filtering module and the bus interface 14 connected with the first microprocessor 13; the main control unit 2 includes: a field bus communication interface module 21 for transmitting digital signals with the bus interface 14 through the field bus 3, a second microprocessor 22 connected with the field bus communication interface module 21, an audio signal conversion circuit 23, an alarm module 24, a communication interface module 25 and an industrial personal computer 26 which are respectively connected with the second microprocessor 22 through serial port communication; the audio signal conversion circuit 23 is connected with the analog signal of the digitized audio signal collector 1 through the audio signal exchange control module 4.
After the digital audio signal collector 1 analyzes and processes the collected sound, on one hand, the sound is uploaded to the main control unit 2 through the bus interface 14 in a digital form, on the other hand, the original analog signal is transmitted to the main control unit 2 in an analog mode, the main control unit 2 is arranged in a central control room, the digital audio signal collector 1 is arranged on a boiler leakage measuring point (namely on a pressure-bearing pipeline to be detected), a plurality of wires are connected to the main control unit 2 with huge workload, for this reason, an audio signal exchange control module 4 is arranged beside the boiler, a plurality of paths of analog signals enter the audio signal exchange control module 4, and the main control unit 2 can switch the digital audio signal collector 1 connected with the audio signal exchange control module 4 through a field bus. When an operator of the industrial personal computer 26 wants to specify data of a certain path of the digital audio signal collector 1, the industrial personal computer 26 sends the number of the digital audio signal collector 1 to the second microprocessor 22, the second microprocessor 22 sends the number to the audio signal exchange control module 4, and the audio signal exchange control module 4 selects the corresponding digital audio signal collector 1 according to an instruction sent by the industrial personal computer 26 and forwarded by the second microprocessor 22. The corresponding digital audio signal collector 1 sends the original analog signal to the main control unit 2, the received detection data of the corresponding digital audio signal collector 1 is summarized, analyzed and processed by the industrial computer 26 of the main control unit 2, the result is displayed on a display screen, if the leakage phenomenon occurs, the alarm signal is sent to the second microprocessor 22, and the second microprocessor 22 sends an alarm instruction to the alarm module 24 to give an alarm prompt.
The digital audio signal collector 1 can detect the characteristic value of the audio signal generated in the working process of the boiler furnace and upload the characteristic value to the main control unit 2 in a digital form through the field bus 3, and the digital quantity transmission mode can improve the reliability of signal transmission and avoid the interference caused by an analog signal transmission mode; the digital audio signal collector 1 comprises a sound signal collecting module and a filtering module connected with the sound signal collecting module, wherein the filtering module is used for filtering after sound is collected and then amplifying after the sound is filtered, so that the influence of background sound on a leakage sound collecting result can be effectively reduced, the sensitivity of detecting the leakage sound is improved, an accurate detection result is given at the initial leakage stage, and the alarm is more timely; the audio signal conversion circuit 23 of the main control unit 2 is connected with the analog signal of the digital audio signal collector 1 through the audio signal exchange control module 4, so that the line connection can be effectively reduced, the transmission line is simplified, the cost is reduced, and the interference introduced in the signal transmission process is avoided.
As a preferred embodiment of the present invention, the industrial personal computer 26 is connected to the cloud server 5 through a network; the cloud server 5 is connected to the database. The monitoring center opens and reads information in the database of the cloud server 5 through a Google web browser, outputs the information to an electronic display screen of the monitoring center in a digital and graphic mode, and generates corresponding alarm output according to the alarm information opened by the web browser.
As a preferred embodiment of the present invention, a digital audio signal collector 1 is disposed on each pressure-bearing pipeline to be detected. Because the boiler system is a huge system and is very huge in size, in order to better detect, a digital audio signal collector 1 is arranged on each pressure-bearing pipeline to be detected, and the number of the digital audio signal collectors 1 can be determined according to actual conditions.
As a preferred embodiment of the present invention, the sound signal collecting module includes a microphone 111; the filtering module comprises a band-pass filter 121 connected with the microphone 111 and a signal conditioning circuit 122 connected with the band-pass filter 121; the signal conditioning circuit 122 is connected to the first microprocessor 13. A band-pass filter 121 and a signal conditioning circuit 122, as shown in fig. 2.
Fig. 3 shows a circuit configuration of the band-pass filter and the signal conditioning circuit.
As shown in fig. 3, the microphone 111 converts the audio signal into a weak electrical signal (mV signal), which is mainly the background sound of the boiler furnace operation and also includes the leakage sound if there is a pressure line leakage fault. Because the background sound of the boiler furnace work is very strong, the frequency distribution is within 1500Hz, the traditional audio signal acquisition terminal has low gain in order to prevent signal saturation distortion on the circuit design, and the initial leakage sound signal is weaker than the background sound signal by more than one order of magnitude, so that the initial leakage fault cannot be identified. Therefore, the invention adopts a processing method that the front end of the signal conditioning circuit 122 is provided with the high-order band-pass filter 121, reduces the relative amplitude of the background sound of the boiler furnace work and then amplifies the background sound, thereby greatly improving the sensitivity of the system to the detection of the leakage sound.
The band-pass filter 121 is composed of a fourth-order high-pass filter and a second-order low-pass filter, and considering that the leakage sound main body is distributed near 4KHz to 5KHz and the frequency response characteristic of the microphone 111, the high-frequency cut-off frequency point and the low-frequency cut-off frequency point of the band-pass filter 121 are respectively:
in consideration of hardware cost and circuit structure simplification, the signal conditioning circuit 122 adopts a single power supply mode, in order to amplify audio ac signals, three pins of operational amplifiers U4A and U4B are connected to V _ (CC-a)/2, and the potentiometer R8 is used to adjust gain, so that the amplitude of the output signal ADC0 of the amplifying circuit meets the requirement of the a/D converter of the first microprocessor 13 for input signals under the input of standard sound source (frequency, sound intensity). For the convenience of system debugging, the signal conditioning circuit 122 further provides an analog current signal output interface, a V-I conversion circuit, and the signal transformation relationship is:
the amplified audio signal ADC0 is a voltage signal, the range is 0-VCC-A, the voltage signal is converted into LINOUT through V-I and output, and after the LINOUT is brought into circuit element parameters, the signal range is about 0-10 mA. The analog current signal output interface circuit can also remotely provide input signals for the sound card of the industrial personal computer through the audio signal exchange control module 4 so as to play the field sound of the boiler furnace working in real time in a control room, and the signals can be collected and stored by the sound card.
As a preferred embodiment of the present invention, the sound signal collection module further includes a self-test module; the self-checking module comprises a buzzer driving circuit 112 and a buzzer 113 connected with the buzzer driving circuit 112; the buzzer driving circuit 112 is connected with the first microprocessor 13; the buzzer 113 is connected to the microphone 111.
Fig. 4 shows a buzzer driving circuit according to an embodiment of the present invention.
As shown in fig. 4, the self-test function is realized by simulating a leakage sound by the buzzer 113. When self-checking is needed, the main control unit 2 sends a self-checking instruction to the digital audio signal collector 1 through the field bus 3, the digital audio signal collector 1 receives the instruction and outputs a 4KHz square wave through the I/O port to drive a SPEAK pin, the buzzer 113 is driven after optical coupling isolation to generate a same-frequency sound signal, the sound signal is received by the MIC and fed back to the band-pass filter 121 and the signal conditioning circuit 122, and finally the sound signal is collected and analyzed by the first microprocessor 13 to obtain a characteristic value of a preset audio frequency, so that the microphone 111, the band-pass filter 121, the signal conditioning circuit 122 and the buzzer driving circuit 112 of the digital audio signal collector 1 can be verified to work normally. If the first type microprocessor 13 does not receive the audio signal with the preset characteristic value after sending the audio driving signal, it indicates that the microphone 111, the band-pass filter 121, the signal conditioning circuit 122, and the buzzer driving circuit 112 of the digitized audio signal collector 1 are abnormal in operation.
Fig. 5 shows a circuit of a bus interface according to an embodiment of the invention.
As shown in fig. 5, the first microprocessor 13 performs fast fourier transform operation on the a/D conversion result to obtain the characteristic value of the measured audio, and the test analysis result is uploaded to the main control unit 2 through the fieldbus 13. In the embodiment of the invention, the field bus uses an RS485 protocol standard, balanced transmission and differential reception are realized, and the capability of inhibiting common-mode interference is strong. The bus transceiver has high sensitivity and can detect the voltage as low as 200mv, so that the transmission signal can be recovered beyond kilometer. The RS-485 bus network topology generally adopts a bus structure with matched terminals and a half-duplex working mode to support multipoint data communication.
As shown in fig. 5, the RS485 signal transceiver uses an SP3485 chip, where UART2-TX is a serial port transmitting signal, UART2-RX is a serial port receiving signal, T-R is a serial port transceiving control signal, and a _485 and B _485 are RS485 differential output/input signals. Z1 is TVS tube to prevent the SP3485 chip from burning by overvoltage.
Fig. 6 shows a power supply circuit according to an embodiment of the present invention.
As shown in fig. 6, the digitized audio signal collector 1 further includes a power supply circuit 15, and the power supply circuit 15 includes two parts, namely a DC-DC power conversion circuit and a multi-stage RC filter circuit. The DC-DC power conversion circuit is a main body of a power supply, a B2403XT-1WR2 type DC-DC power module produced by Guangzhou Jinsheng Yang science and technology Limited is adopted, and the B2403XT-1WR2 has the characteristics of low cost, capability of converting 24V input voltage into isolated 3.3V output and capability of reaching 1W of output power. The module is suitable for application occasions where an on-board power supply system needs to be isolated, and the voltage variation range of an input power supply is required to be within +/-10%, the isolation voltage between input and output is less than or equal to 1500VDC, and the requirements on the stability of output voltage and the output ripple noise are not high. The DC-DC conversion circuit designed by B2403XT-1WR2 is used.
As a preferred embodiment of the present invention, the main control unit 2 further includes a steam flow rate collecting circuit 27; the steam flow rate acquisition circuit 27 is connected to the second microprocessor 22. The steam flow conditions of all pipelines of the boiler can be acquired through the flow acquisition circuit and used as auxiliary statistical analysis data. The steam flow rate acquisition circuit 27 is shown in fig. 7.
Steam flow is an important reference for leak fault detection of a pressure-bearing pipeline, so the system needs to accurately detect a flow signal of steam in the pipeline. The output of the flow transmitter is a 4-20 mA standard current signal, which is converted into a 0.4-2V voltage signal by the I-V conversion circuit shown in FIG. 7 to meet the requirement of the ADC of the second microprocessor 22 on the input signal. The operational amplifier in the circuit is OPA2335 produced by Texas Instruments, which is a single power supply CMOS operational amplifier with a maximum drift of 0.05 uV/DEG C. R3 is a current sampling resistor, and requires the use of a metal film precision resistor of 100 omega/0.1%/20 PPm to ensure the reliability of operation.
As a preferred embodiment of the present invention, the main control unit 2 further includes a switching value output circuit 28; the switching value output circuit 28 is connected to the second microprocessor 22.
The main control unit 2 outputs alarms such as leakage alarm, fault, ash blockage and the like according to the detection and analysis result, and drives the ash blowing electromagnetic valve, and the functions are completed through the switching value output circuit 28. The switching value output circuit 28 has the same configuration. The circuit of the alarm module 24 is shown in fig. 8, and is a dry contact output circuit of a photoelectric isolation relay.
As a preferred embodiment of the present invention, the main control unit 2 further includes a switching value input circuit 29; the switching value input circuit 29 is connected with the second microprocessor 22; the second microprocessor 22 is connected to the distributed control system.
The pressure-bearing pipeline leakage detection system receives a soot blowing control instruction sent by a DCS (distributed control system) and executes soot blowing control operation. In order to improve the anti-interference capability of the system, the soot blowing control signal is converted by the photoelectric isolation switching value input interface circuit and then sent to the second microprocessor 22. The switching value input circuit is shown in fig. 9, wherein V _ G is a +5V isolated power supply, CHUIHUI-K is an input dry contact switching value signal, and TLP521-1 is a photocoupler. The on/off signal of the switch CHUIHUI-K is converted into a high/low level signal of CHUIHUI through circuit isolation, and is sampled by the second microprocessor 22.
Fig. 10 illustrates a structure of an audio handshake control module according to an embodiment of the present invention.
As shown in fig. 10, as a preferred embodiment of the present invention, the audio handshake control module 4 includes: a third microprocessor 41, an analog switch 42 connected to the third microprocessor 41, a sampling circuit 43 connected to the analog switch 42, a voltage-current conversion circuit 44 connected to the analog switch 42, and a third communication interface 45 connected to the third microprocessor 41; the voltage-current conversion circuit 44 is connected to the audio signal conversion circuit 23; the sampling circuit 43 is connected with the digital audio signal collector 1; the third communication interface 45 is connected to the field bus 3.
The system can comprise a plurality of paths of digital audio collectors 1, wherein each path of digital audio collector 1 transmits an analog audio signal to an industrial personal computer sound card of a main control unit 2, and the sound card can only receive one path of audio signal. Therefore, an audio signal exchange control module 4 is needed to be arranged and used for controlling and gating 0-10 mA current signals output by a certain path of digital audio collector 1 and uploading the current signals to the main control unit 2. A block diagram of the audio handshake control module 4 is shown in fig. 10.
As a preferred embodiment of the present invention, the first microprocessor 13 is an embedded microprocessor; and/or the second microprocessor 22 is an embedded microprocessor; and/or the third microprocessor is an embedded microprocessor 41.
The basic peripheral circuitry of the first microprocessor 13 is shown in figure 11; the basic peripheral circuitry of the second microprocessor 22 is shown in figure 12.
The first microprocessor 13 includes SWD four-wire debug download interfaces (VCC, SWDIO, SWCLK, and GND), a power-on reset signal circuit (NRST), an analog power supply (VDDA) supply filter circuit, and a digital power supply (VCC) filter circuit. The external interface signals of the embedded microprocessor comprise serial interface signals UART2-TX (serial sending signal), UART2-RX (serial receiving signal) and T-R (serial receiving and sending control signal), audio analog input signals (ADC0), buzzer driving control Signals (SPEAK) and 8-bit LED indicator lamp driving control signals.
The main chip of the second microprocessor 22 uses an STM32F103VCT6 embedded microprocessor produced by Italian semiconductor corporation, and the STM32F103VCT6 is a microcontroller which integrates an elegant peripheral on the basis of ARM Cortex-M architecture and has the advantages of low-voltage operation, low power consumption, high performance and the like. The debugging download interface is an SWD four-wire interface (VCC, SWDIO, SWCLK and GND), NRST is a power-on reset signal, VCC is a power supply of an internal digital circuit, and AV + is a power supply of an internal analog circuit. The serial UART1 is a field bus interface for communicating with a digital audio acquisition terminal at a baud rate of 9600 bps. The serial port UART3 is an industrial personal computer communication interface, and has a baud rate of 115200 bps. XIELOU, GUZHANG, MCU-K3-MCU-K8 are output I/O ports for controlling leakage and fault alarm and relevant solenoid valves. The CHUIHUI is an input I/O port and is used for detecting whether the system is in a soot blowing working state or not. And an input I/O port is reserved for the system by the YULU. XL-LED, GZH-LED and CHH-LED are used for controlling I/O of leakage, fault and soot blowing state indicator lamps. ADC1 and ADC2 are analog signal input pins of built-in ADC of the embedded microprocessor, and reference voltage is provided for the ADC by an external voltage-stabilizing reference LM336-2.5V, so that the precision and the stability of an A/D conversion result can be ensured.
According to the boiler pressure-bearing pipeline leakage detection system, the characteristic value of the audio signal generated in the working process in the boiler hearth can be detected through the digital audio signal collector, and the characteristic value is uploaded to the main control unit in a digital form through the field bus, so that the reliability of signal transmission can be improved through the digital quantity transmission mode, and the interference caused by the analog signal transmission mode is avoided; the digital audio signal collector comprises a sound signal collecting module and a filtering module connected with the sound signal collecting module, wherein the filtering module is used for filtering after collecting sound and then amplifying after filtering, so that the influence of background sound on a leakage sound collecting result can be effectively reduced, the sensitivity of detecting the leakage sound is improved, an accurate detection result is given at the initial leakage stage, and the alarm is more timely; the audio signal conversion circuit of the main control unit is connected with the analog signal of the digital audio signal collector through the audio signal exchange control module, so that the line connection can be effectively reduced, the transmission line is simplified, the cost is reduced, and the interference in the signal transmission process is avoided.
The pressure-bearing line leakage detection system for a boiler proposed according to the present invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the pressure-bearing line leak detection system for a boiler proposed by the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (10)
1. A boiler pressure-bearing pipeline leakage detection system, characterized by includes: the digital audio signal collector and the main control unit; wherein the content of the first and second substances,
the digital audio signal collector is arranged on the pressure-bearing pipeline to be detected;
the digital audio signal collector comprises: the device comprises a sound signal acquisition module, a filtering module connected with the sound signal acquisition module, a first microprocessor connected with the filtering module and a bus interface connected with the first microprocessor;
the main control unit includes: the system comprises a field bus communication interface module, a second microprocessor, an audio signal conversion circuit, an alarm module, a communication interface module and an industrial personal computer, wherein the field bus communication interface module is used for carrying out digital signal transmission with the bus interface through a field bus;
the audio signal conversion circuit is connected with the analog signal of the digital audio signal collector through an audio signal exchange control module.
2. The boiler pressure-bearing line leak detection system according to claim 1,
the industrial personal computer is connected with the cloud server through a network;
the cloud server is connected with the database.
3. The boiler pressure-bearing line leak detection system according to claim 1,
and a digital audio signal collector is arranged on each pressure-bearing pipeline to be detected.
4. The boiler pressure-bearing line leak detection system according to claim 1,
the sound signal acquisition module comprises a microphone;
the filtering module comprises a band-pass filter connected with the microphone and a signal conditioning circuit connected with the band-pass filter;
the signal conditioning circuit is connected with the first microprocessor.
5. The boiler pressure-bearing line leak detection system according to claim 4,
the sound signal acquisition module also comprises a self-checking module;
the self-checking module comprises a buzzer driving circuit and a buzzer connected with the buzzer driving circuit; the buzzer driving circuit is connected with the first microprocessor; the buzzer is connected with the microphone.
6. The boiler pressure-bearing line leak detection system according to claim 1,
the main control unit further comprises a steam flow acquisition circuit;
the steam flow acquisition circuit is connected with the second microprocessor.
7. The boiler pressure-bearing line leak detection system according to claim 1,
the main control unit also comprises a switching value output circuit;
and the switching value output circuit is connected with the second microprocessor.
8. The boiler pressure-bearing line leak detection system according to claim 1,
the main control unit also comprises a switching value input circuit;
the switching value input circuit is connected with the second microprocessor;
and the second microprocessor is connected with the distributed control system.
9. The boiler pressure-bearing line leak detection system according to claim 1,
the audio signal exchange control module includes: the device comprises a third microprocessor, an analog switch connected with the third microprocessor, a sampling circuit connected with the analog switch, a voltage-current conversion circuit connected with the analog switch and a third communication interface connected with the third microprocessor;
the voltage-current conversion circuit is connected with the audio signal conversion circuit;
the sampling circuit is connected with the digital audio signal collector;
the third communication interface is connected with the field bus.
10. The boiler pressure-bearing line leak detection system according to claim 9,
the first microprocessor is an embedded microprocessor; and/or the presence of a gas in the gas,
the second microprocessor is an embedded microprocessor; and/or the presence of a gas in the gas,
the third microprocessor is an embedded microprocessor.
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