CN215297137U - In-situ ammonia gas analyzer for measuring dry basis concentration - Google Patents
In-situ ammonia gas analyzer for measuring dry basis concentration Download PDFInfo
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- CN215297137U CN215297137U CN202121461356.7U CN202121461356U CN215297137U CN 215297137 U CN215297137 U CN 215297137U CN 202121461356 U CN202121461356 U CN 202121461356U CN 215297137 U CN215297137 U CN 215297137U
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Abstract
The application relates to an in-situ ammonia gas analyzer for measuring dry basis concentration, which comprises a transmitting module, a receiving module and a power supply unit, wherein the transmitting module is used for emitting laser beams with wavelength ranges covering absorption peaks of ammonia gas and water vapor simultaneously; the transmitting module comprises a laser transmitter and a first control unit, and the first control unit is used for controlling the laser transmitter to transmit a laser beam capable of passing through the target gas and receiving a synchronous signal from the receiving module; the receiving module comprises a signal receiving unit and a second control unit, the signal receiving unit is used for receiving laser beams penetrating through the target gas and converting optical signals into electric signals, the second control unit analyzes and processes the electric signals, and the second control unit is connected with an output interface used for outputting the dry gas concentration of the target gas. The method has the effect of obtaining the high-precision ammonia gas dry basis concentration value in real time.
Description
Technical Field
The application relates to the field of gas detection and analysis, in particular to an in-situ ammonia gas analyzer for measuring dry basis concentration.
Background
Nitrogen oxide is one of main pollutants in the atmosphere, and the current mature flue gas denitration technology reduces nitrogen oxide into nitrogen gas in an ammonia spraying mode to achieve the purpose of removing nitrogen oxide. However, excessive ammonia spraying can cause the discharge of excessive ammonia gas through a chimney (ammonia escape), thereby causing environmental pollution; and excess ammonia has a corrosive effect on equipment downstream of the boiler. Therefore, the concentration value of the ammonia gas in the flue gas needs to be controlled within a certain range. In addition, according to the requirements specified by the industry, the flue gas concentration value should be reported by taking the dry basis as a standard.
The existing ammonia escape measurement technology generally adopts extraction type and in-situ type measurement technologies. The smoke sampling system extracts a smoke sample to an external measurement air chamber, and then the smoke concentration is measured by an instrument. The dehumidification module is arranged in the existing flue gas sampling system, and water vapor in a flue gas sample can be removed before detection, so that a measured value is a dry basis concentration value, and the industrial requirements can be met. The in-situ measurement technology directly installs the equipment on the side wall of the flue, and can measure the concentration change of the ammonia gas in the flue in real time.
Aiming at the related technologies, the inventor thinks that the process of transmitting the flue gas sample from the sampling point to the measuring gas chamber in the extraction type measuring technology needs a period of time, so that the measured value has hysteresis and can not immediately reflect the concentration change in the flue; meanwhile, the flue gas sample is easy to lose and change gas characteristics in the transmission process of the sampling system, so that the measured ammonia gas dry basis concentration value is not high in precision. In the in-situ measurement technology, because the wavelength scanning range of the laser is limited, the absorption peaks of ammonia gas and water vapor cannot be covered at the same time, so that only the wet basis concentration value of the ammonia gas can be output, and the reported requirement cannot be directly met. Therefore, the two schemes are not convenient for obtaining the high-precision ammonia gas dry basis concentration value in real time.
SUMMERY OF THE UTILITY MODEL
In order to obtain the high-precision ammonia gas dry basis concentration value in real time, the application provides an in-situ ammonia gas analyzer for measuring the dry basis concentration.
The application provides a measure normal position ammonia gas analyzer of dry basis concentration adopts following technical scheme:
an in-situ ammonia gas analyzer for measuring dry basis concentration comprises a transmitting module, a receiving module and a power supply unit;
the emission module is arranged on the side wall of the flue and used for emitting light beams covering absorption peaks of ammonia gas and water vapor at the same time;
the receiving module is arranged on the side wall of the flue at the other end opposite to the transmitting module and used for receiving the light beam passing through the target gas, analyzing the received light beam and obtaining the dry-based gas concentration of the target gas through water vapor compensation;
the power supply unit is used for supplying required electric energy to the transmitting module and the receiving module;
the transmitting module comprises a laser transmitter and a first control unit, the first control unit is in signal connection with the laser transmitter, and the first control unit is used for controlling the laser transmitter to transmit a laser beam capable of passing through a target gas and receiving a synchronization signal from the receiving module;
the receiving module comprises a signal receiving unit and a second control unit, the second control unit is in signal connection with the signal receiving unit, the signal receiving unit is used for receiving laser beams penetrating through target gas and converting optical signals into electric signals, the second control unit analyzes and processes the electric signals, and the second control unit is connected with an output interface used for outputting the concentration of the dry-based gas of the target gas.
By adopting the technical scheme, the transmitting module and the receiving module are arranged on the side wall of the flue, namely, the concentration values of ammonia gas and water vapor are measured by adopting an in-situ installation mode, and the high-precision ammonia gas dry-based concentration value is obtained by water vapor compensation. The concentration change of escaping ammonia in the flue gas can be immediately reflected, the measuring effectiveness is improved, the dry-based concentration value of the ammonia gas is directly output through the output interface, dry-wet-based conversion calculation is not needed, and the working efficiency is improved.
Optionally, a first beam adjusting unit is disposed on one side of the emitting end of the laser emitter, and the first beam adjusting unit is configured to adjust the laser beam emitted by the laser emitter, so that the laser beam forms a parallel beam.
By adopting the technical scheme, the first light beam adjusting unit is arranged, so that the diffused laser beam forms a parallel light beam, and the laser beam can conveniently penetrate through the target gas and then be captured by the receiving module; and the first light beam adjusting unit is arranged on one side of the transmitting end of the laser transmitter, so that the laser beams can be conveniently converted.
Optionally, the first beam adjusting unit adopts an optical collimating lens.
By adopting the technical scheme, the laser beam is converted into the parallel beam by the arrangement of the optical collimating lens.
Optionally, the transmitting module is provided with a first communication unit, and the receiving module is provided with a second communication unit corresponding to the first communication unit; the first communication unit is in signal connection with the second communication unit, and the first communication unit is also in signal connection with the first control unit.
By adopting the technical scheme, the signal connection between the transmitting module and the receiving module is realized by arranging the first communication unit and the second communication unit, so that the synchronization between the measurement data and the parameters in the transmitting module and the receiving module is facilitated, and the target gas is accurately measured.
Optionally, the first communication unit and the second communication unit communicate by using a wired connection.
By adopting the technical scheme, the data synchronization and the data communication are carried out in a wired connection mode, so that the interference of environmental factors on signal transmission can be reduced, and the communication is more stable.
Optionally, a second light beam adjusting unit is disposed at one end of the signal receiving unit facing the transmitting module, and the second light beam adjusting unit is configured to converge the parallel laser light beams to the signal receiving unit.
Through adopting above-mentioned technical scheme, through the setting to second light beam regulating unit, can assemble the laser beam of parallel in signal receiving unit, improved the acceptance rate that signal receiving unit received the laser beam to further improve the accuracy of measured ammonia and steam concentration.
Optionally, the second beam adjusting unit employs a converging lens.
By adopting the technical scheme, the parallel laser beams are conveniently converged on the signal receiving unit through the arrangement of the converging lens.
Optionally, a signal amplifying unit is connected between the signal receiving unit and the second control unit, and the signal amplifying unit is configured to amplify the electrical signal converted by the signal receiving unit.
By adopting the technical scheme, if the signal strength of the electric signal is weak, partial signal distortion can be caused, the accuracy of the second control unit on signal processing can be influenced, the electric signal converted by the signal receiving unit is further amplified by the signal amplifying unit, and the second control unit can accurately process the signal conveniently.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the concentration change of escaping ammonia in the flue gas can be immediately reflected by adopting an in-situ installation mode for the transmitting module and the receiving module, and the effect of improving the measurement effectiveness is achieved;
2. through the arrangement of the signal receiving unit and the second control unit, concentration values of ammonia gas and water vapor can be measured, and a high-precision ammonia gas dry basis concentration value is obtained through water vapor compensation; the ammonia gas dry-basis concentration value is directly output through the output interface, dry-wet basis conversion calculation is not needed, and the effect of improving the measurement working efficiency is achieved;
3. through the arrangement of the first light beam adjusting unit and the second light beam adjusting unit, the laser light beams are converted into parallel light beams before passing through the target gas, and the parallel light beams are converged after passing through the target gas, so that the target gas can be conveniently measured.
Drawings
FIG. 1 is a block diagram of the overall architecture of an embodiment of the present application;
fig. 2 is a schematic diagram of the overall working principle of the embodiment of the present application.
Description of reference numerals: 1. a transmitting module; 11. a laser transmitter; 12. a first control unit; 13. a first beam adjusting unit; 14. a first communication unit; 2. a receiving module; 21. a second communication unit; 22. a signal receiving unit; 23. a second control unit; 24. a second beam adjusting unit; 25. a signal amplification unit; 3. a power supply unit; 4. a target gas; 5. and (6) an output interface.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses an in-situ ammonia gas analyzer for measuring dry basis concentration. Referring to fig. 1 and 2, the in-situ ammonia gas analyzer comprises an emission module 1, a receiving module 2 and a power supply unit 3, wherein the emission module 1 and the receiving module 2 are both arranged on the side wall of the flue. The emitting module 1 is used for emitting a light beam capable of passing through the target gas 4, and the receiving module 2 is used for receiving the light beam passing through the target gas 4, analyzing the received light beam and calculating the dry-based gas concentration of the target gas 4. The power supply unit 3 is used for supplying the required power to the transmitting module 1 and the receiving module 2.
Referring to fig. 1 and 2, the transmitting module 1 includes a laser transmitter 11 and a first control unit 12, wherein the first control unit 12 is in signal connection with the laser transmitter 11, and the first control unit 12 is used for controlling the laser transmitter 11 to emit a laser beam capable of passing through the target gas 4 and receiving a synchronization signal from the receiving module 2; wherein the synchronization signal includes, but is not limited to, a dry basis concentration value, a light transmittance, etc. of the target gas 4.
Referring to fig. 1 and 2, in the present application, the concentrations of ammonia and water vapor need to be measured, and then an appropriate central wavelength and an appropriate wavelength scanning range need to be selected; the central wavelength of the laser emitter 11 is controlled by the temperature of the laser emitter 11, a proper central wavelength position is selected according to the positions of ammonia and water vapor absorption peaks, and the stable output of the central wavelength is realized through the temperature control of the first control unit 12. The wavelength scanning range of the laser emitter 11 is controlled by the scanning current of the laser emitter 11, the first control unit 12 controls the scanning current range, the central position and the scanning amplitude of the output wavelength of the laser emitter 11 are controlled, the wide-spectrum scanning of the output wavelength of the laser emitter 11 is realized, and therefore the wavelength scanning range covers the absorption peaks of ammonia gas and water vapor gas at the same time.
Referring to fig. 1 and 2, in order to facilitate that laser emitted by the laser emitter 11 can be captured by the receiving module 2 after passing through the target gas 4, a first beam adjusting unit 13 is disposed on a side of the emitting end of the laser emitter 11 facing the emitting end, and the first beam adjusting unit 13 is configured to adjust a laser beam emitted by the laser emitter 11, so that the divergent laser beam forms a parallel laser beam, and is convenient to be received by the receiving module 2 after passing through the target gas 4. In the present application, the first beam adjusting unit 13 preferably employs an optical collimating lens.
Referring to fig. 1 and 2, since the measurement data and parameters in the transmitting module 1 and the receiving module 2 need to be synchronized, the target gas 4 can be accurately measured; in order to facilitate the signal transmission between the transmitting module 1 and the receiving module 2, the transmitting module 1 is provided with a first communication unit 14, and the receiving module 2 is provided with a second communication unit 21 corresponding to the first communication unit 14. The first communication unit 14 is in signal connection with the second communication unit 21, and the first communication unit 14 is also in signal connection with the first control unit 12. The data processed by the receiving module 2 is sent to the first communication unit 14 by the second communication unit 21, and then is transmitted to the first control unit 12 for signal synchronization, so that the measured data and parameters in the transmitting module 1 and the receiving module 2 are synchronized. The signal connection between the first communication unit 14 and the second communication unit 21 may be a wired connection or a wireless connection, where the wireless connection includes, but is not limited to, a 4G connection, a 5G connection, a Wi-Fi connection, a bluetooth connection, and a Zigbee networking connection. The data synchronization and the data communication are carried out by adopting a wire connection mode in wired connection, so that the interference of environmental factors on signal transmission can be reduced.
Referring to fig. 1 and 2, after the receiving module 2 receives the laser beam passing through the target gas 4, the laser beam needs to be analyzed, so as to obtain concentration values of ammonia gas and water vapor. The receiving module 2 comprises a signal receiving unit 22 for receiving the laser beam and a second control unit 23 for analyzing and processing the laser beam, the second control unit 23 is in signal connection with the signal receiving unit 22, the signal receiving unit 22 converts the optical signal into a specific electric signal after receiving the laser beam passing through the target gas 4, and the specific electric signal is transmitted to the second control unit 23 for signal processing and concentration calculation, so that the concentration values of ammonia gas and water vapor are obtained. First control unit 12 and second control unit 23 all adopt MCU (little the control unit) in this application, and wherein the MCU model includes but not limited to STM32H7 series, EFM32 series, GD32F3 series, all can realize the function in this application can, and the MCU model preferably adopts STM32H750VBT6 chip in this application.
Referring to fig. 1 and 2, since the concentration values of ammonia gas and water vapor are obtained at this time, the concentration values of ammonia gas and water vapor need to be further processed since the concentration values of ammonia gas and water vapor need to be accurately obtained in the present application. The second control unit 23 processes and obtains the ammonia gas wet-based concentration value
Water vapor concentration value
Dry basis concentration value of ammonia
The calculation formula of (2) is as follows:
according to a formula, obtaining and outputting an ammonia gas dry basis concentration value
. The second control unit 23 is connected with an output interface 5 for outputting the dry-based concentration value of ammonia gas
And so on.
Referring to fig. 1 and 2, the laser beam passing through the target gas 4 is a parallel laser beam under the adjustment of the first beam adjusting unit 13; in order to improve the receiving rate of the signal receiving unit 22 for receiving the laser beam, along the irradiation direction of the laser beam, a second beam adjusting unit 24 is arranged at one end of the signal receiving unit 22 facing the emitting module 1, and the second beam adjusting unit 24 is used for converging the parallel laser beam onto the signal receiving unit 22, so that the receiving rate of the laser beam on the signal receiving unit 22 is improved, and the accuracy of the measured ammonia and water vapor concentration is improved. In the present application, the second beam adjusting unit 24 is preferably a converging lens.
Referring to fig. 1 and 2, the signal receiving unit 22 converts the optical signal into an electrical signal, which may cause distortion of a part of the signal if the signal strength of the electrical signal is weak, and may affect the accuracy of the signal processing performed by the second control unit 23; therefore, in order to avoid the above situation, the signal amplification unit 25 is connected between the signal receiving unit 22 and the second control unit 23 through a signal, in this application, an LM358 operational amplifier module is preferably used as the signal amplification unit 25, and the signal amplification unit 25 is used to further amplify the electrical signal converted by the signal receiving unit 22, so that the second control unit 23 can accurately process the signal.
The implementation principle of the in-situ ammonia gas analyzer for measuring the dry basis concentration is as follows: the power supply unit 3 supplies power to the transmitting module 1 and the receiving module 2, the first control unit 12 controls the laser transmitter 11 to emit laser beams, the first beam adjusting unit 13 adjusts the laser beams into parallel laser beams, the parallel laser beams are converged to the signal receiving unit 22 under the adjustment of the second beam adjusting unit 24 after passing through the target gas 4, the signal receiving unit 22 converts optical signals into electric signals, the electric signals are transmitted to the signal amplifying unit 25 to be amplified, and finally the amplified electric signals are transmitted to the second control unit 23 to be subjected to signal processing, so that the ammonia gas dry basis concentration value is obtained and output.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a measure normal position ammonia gas analysis appearance of dry basis concentration which characterized in that: the device comprises a transmitting module (1), a receiving module (2) and a power supply unit;
the emission module (1) is arranged on the side wall of the flue and used for emitting laser beams with wavelength ranges covering absorption peaks of ammonia gas and water vapor;
the receiving module (2) is arranged on the side wall of the flue at the other end opposite to the transmitting module (1) and is used for receiving the laser beam passing through the target gas (4), analyzing the received beam and obtaining the dry-based gas concentration of the target gas (4) through water vapor compensation;
the power supply unit (3) is used for supplying required electric energy to the transmitting module (1) and the receiving module (2);
the transmitting module (1) comprises a laser transmitter (11) and a first control unit (12), the first control unit (12) is in signal connection with the laser transmitter (11), and the first control unit (12) is used for controlling the laser transmitter (11) to transmit a laser beam capable of passing through a target gas (4) and receiving a synchronization signal from the receiving module (2);
the receiving module (2) comprises a signal receiving unit (22) and a second control unit (23), the second control unit (23) is in signal connection with the signal receiving unit (22), the signal receiving unit (22) is used for receiving laser beams penetrating through the target gas (4) and converting the optical signals into electric signals, the second control unit (23) analyzes and processes the electric signals, and the second control unit (23) is connected with an output interface (5) used for outputting the dry gas concentration of the target gas (4).
2. An in-situ ammonia gas analyzer for measuring dry basis concentration according to claim 1, wherein: a first light beam adjusting unit (13) is arranged on one side of the emitting end of the laser emitter (11), and the first light beam adjusting unit (13) is used for adjusting the laser beams emitted by the laser emitter (11) to enable the laser beams to form parallel light beams.
3. An in-situ ammonia gas analyzer for measuring dry basis concentration according to claim 2, wherein: the first beam adjusting unit (13) adopts an optical collimating lens.
4. An in-situ ammonia gas analyzer for measuring dry basis concentration according to claim 1, wherein: the transmitting module (1) is provided with a first communication unit (14), and the receiving module (2) is provided with a second communication unit (21) corresponding to the first communication unit (14); the first communication unit (14) is in signal connection with the second communication unit (21), and the first communication unit (14) is also in signal connection with the first control unit (12).
5. The in-situ ammonia gas analyzer for measuring dry basis concentration according to claim 4, wherein: the first communication unit (14) and the second communication unit (21) communicate by using a wired connection.
6. An in-situ ammonia gas analyzer for measuring dry basis concentration according to claim 1, wherein: one end of the signal receiving unit (22) facing the transmitting module (1) is provided with a second light beam adjusting unit (24), and the second light beam adjusting unit (24) is used for converging parallel laser light beams on the signal receiving unit (22).
7. The in-situ ammonia gas analyzer for measuring dry basis concentration according to claim 6, wherein: the second beam adjusting unit (24) employs a condensing lens.
8. An in-situ ammonia gas analyzer for measuring dry basis concentration according to claim 1, wherein: a signal amplifying unit (25) is connected between the signal receiving unit (22) and the second control unit (23) through signals, and the signal amplifying unit (25) is used for amplifying the electric signals converted by the signal receiving unit (22).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116183550A (en) * | 2023-04-25 | 2023-05-30 | 一念传感科技(深圳)有限公司 | Hydrogen concentration measurement method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116183550A (en) * | 2023-04-25 | 2023-05-30 | 一念传感科技(深圳)有限公司 | Hydrogen concentration measurement method and system |
| CN116183550B (en) * | 2023-04-25 | 2023-09-22 | 一念传感科技(深圳)有限公司 | Hydrogen concentration measurement method and system |
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