CN218974167U - Boiler flue gas monitoring system of power plant - Google Patents
Boiler flue gas monitoring system of power plant Download PDFInfo
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- CN218974167U CN218974167U CN202120630775.2U CN202120630775U CN218974167U CN 218974167 U CN218974167 U CN 218974167U CN 202120630775 U CN202120630775 U CN 202120630775U CN 218974167 U CN218974167 U CN 218974167U
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- infrared laser
- flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a power plant boiler flue gas monitoring system, which comprises: an infrared laser emitting device; an infrared laser receiving device; an optical conversion module; a signal processing module; the infrared laser emission device and the infrared laser receiving device are respectively arranged on two sides of the flue, the optical conversion module is connected with the infrared receiving device, and the signal processing module is connected with the optical conversion module and used for analyzing and processing collected data. The system adopts TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology to set up hardware equipment at the flue gas passageway of power plant boiler, realizes the detection to the flue gas through the mode of software and hardware combination, can accurately acquire flue gas composition and content, can be used to the judgement of combustion material for adjust and divide the coal ratio and the flue gas leakage detects.
Description
Technical Field
The utility model relates to the field of flue gas monitoring, in particular to a flue gas monitoring system
Background
A large amount of flue gas is discharged in the operation process of the power plant boiler, and various other gas components are mixed in the flue gas in the recycling and purifying processes of the flue gas, so that the components of the flue gas are more complex. If the concentration value of a certain gas in the smoke components can be monitored, whether the ratio of the air to the coal is proper when the boiler burns or not can be known and adjusted, and whether equipment such as a smoke heat exchanger and the like is leaked or not can be monitored and judged, and the loss can be reduced by timely replacing a module.
The current monitoring means cannot meet the real-time performance and rapidity of monitoring, cannot meet the monitoring requirement under the condition of rapid change of smoke components, and in addition, if some equipment in a boiler leaks, the initial leakage quantity is very small, the traditional monitoring means cannot monitor, so that a method with high sensitivity and high accuracy is needed for monitoring.
Disclosure of Invention
One of the purposes of the utility model is to provide a power plant boiler flue gas monitoring system, wherein a TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology is adopted in the system, hardware equipment is arranged in a flue gas channel of a power plant boiler, the detection of flue gas is realized in a mode of combining software and hardware, the components and the content of the flue gas can be accurately obtained, and the system can be used for judging combustion substances and adjusting the coal distribution ratio and the flue gas leakage detection.
One of the purposes of the utility model is to provide a power plant boiler flue gas monitoring system, wherein the system is provided with a protection device at an infrared laser emitting device and a receiving device, so that the influence of adhesion of impurities such as dust of flue gas on the detection effect can be effectively avoided.
One of the purposes of the utility model is to provide a power plant boiler flue gas monitoring system, wherein an anti-interference device is arranged on an infrared laser transmitting device and an infrared laser receiving device, and the robustness of the system can be enhanced through the anti-interference device.
One of the purposes of the utility model is to provide a power plant boiler flue gas monitoring system, which is provided with a self-calibration module and performs gain adjustment after photoelectric conversion, so that the flue gas concentration data is more accurate.
One of the purposes of the utility model is to provide a power plant boiler flue gas monitoring system, which adopts the existing infrared laser absorption spectra of different components to calibrate, thereby realizing rapid and accurate identification of flue gas components.
In order to achieve at least one of the above objects, the present utility model further provides a power plant boiler flue gas monitoring system comprising:
an infrared laser emitting device;
an infrared laser receiving device;
an optical conversion module;
a signal processing module;
the infrared laser emission device and the infrared laser receiving device are respectively arranged on two sides of the flue, the optical conversion module is connected with the infrared receiving device, and the signal processing module is connected with the optical conversion module and used for analyzing and processing collected data.
According to one preferred embodiment of the present utility model, the infrared laser emitting device and the infrared laser receiving device are respectively disposed opposite to each other, and the emitting port of the infrared laser emitting device is opposite to the receiving port of the infrared laser device.
According to another preferred embodiment of the present utility model, the infrared laser emitting device is connected to an optical fiber, and the optical fiber is used for transmitting infrared laser with a preset wavelength to the infrared laser emitting device.
According to another preferred embodiment of the present utility model, the infrared laser emitting device comprises a laser collimator, which is arranged in an emission channel of the infrared laser emitting device.
According to another preferred embodiment of the present utility model, the infrared laser emitting device and the infrared laser receiving device are respectively provided with an ash removing air channel, the ash removing air channels are respectively arranged at the openings of the infrared laser emitting device and the infrared laser receiving device, and the ash removing air channels are transversely arranged, and the ash removing air channels are connected with an air pump and are used for respectively forming movable air flows at the infrared laser emitting device and the infrared laser receiving device.
According to another preferred embodiment of the present utility model, the emitting ports of the infrared laser emitting device and the infrared laser receiving device are respectively provided with a quartz window layer.
According to another preferred embodiment of the present utility model, the light conversion module includes a photodetector, and the bottom of the infrared laser receiving device is provided with the photodetector, so as to convert the received infrared laser into an electrical signal.
According to another preferred embodiment of the present utility model, an input end of the photodetector is connected to the receiving channel, and an output end of the photodetector is connected to the signal processing module, and the signal processing module is used for analyzing the smoke component and the concentration.
According to another preferred embodiment of the present utility model, a filter and a focusing lens are disposed in a receiving channel of the infrared laser receiving device, wherein the filter is disposed between the quartz window layer and the focusing lens, and the focusing lens is used for focusing the incident infrared laser.
According to another preferred embodiment of the present utility model, the laser emitting device comprises a laser self-calibration sensor for self-calibration of the emitted laser.
According to one preferred embodiment of the present utility model, a focusing lens is disposed in the receiving channel of the infrared laser receiving device, and the focusing lens is disposed near the photodetector.
According to one preferred embodiment of the utility model, the system comprises a wavelength calibration module for calibrating the infrared laser emission wavelength.
In order to achieve at least one of the above objects, the present utility model further provides a method for monitoring flue gas of a power plant boiler, the method comprising the steps of:
setting target detection gas, and acquiring Voigt line type of the target detection gas according to a TDLAS technology;
setting infrared laser emission wavelength according to the set target detection gas;
transmitting infrared laser with the selected transmitting wavelength into the flue;
acquiring attenuation degree of infrared laser in a flue, and establishing Voigt line type of detection gas;
and (3) comparing with the Voigt line type of the target detection gas, and if the line type is the same, calculating the concentration of the target gas.
According to one preferred embodiment of the utility model, the emitted infrared laser light is collimated and the laser drift is compensated and corrected.
According to another preferred embodiment of the present utility model, a concentration threshold of the target detection gas is set, and if the detected concentration of the target detection gas is greater than the concentration threshold, alarm information is generated for alerting the outside.
Drawings
FIG. 1 shows a schematic diagram of a flue gas monitoring system for a power plant boiler according to the present utility model;
FIG. 2 is a schematic diagram showing the connection structure of an infrared laser emitting device in a power plant boiler flue gas monitoring system according to the present utility model;
FIG. 3 is a schematic diagram showing the connection structure of an infrared laser receiving device in a power plant boiler flue gas monitoring system;
FIG. 4 shows the flow chart of a method for monitoring the flue gas of a power plant boiler according to the utility model.
Wherein, the flue-10, the infrared laser emitting module-20, the optical fiber-21, the laser collimator-22, the infrared laser receiving module-30, the filter-31, the focusing lens-32, the device comprises an ash removal air passage-40, a quartz window layer-50, a light conversion module-40, a photoelectric detector-41, a coaxial cable-42, a signal processing module-50 and a calibration module-60.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.
It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present utility model.
Referring to fig. 1-4, the utility model discloses a power plant boiler flue gas monitoring system and a method, wherein the system applies TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology to a power plant boiler to achieve the purposes of component detection, gas leakage detection and the like of power plant boiler combustion.
It should be noted that the principle of TDLAS technology is that different gases have unique absorption spectra that are not interfered by other gases. It is thus possible to determine whether or not the gas is present by irradiating the corresponding gas with infrared laser light of a specific wavelength. In one preferred embodiment of the present utility model, since the absorption spectra of different components of the mixed gas are different in corresponding wavelength, the wavelength range corresponding to the gas to be detected is calculated, and the presence or absence of the corresponding gas and the concentration of the corresponding gas can be detected by emitting infrared laser light in the required wavelength range.
Since the frequency width of different gas absorption spectral lines is limited by a plurality of broadening conditions, the utility model adopts two standard line types: lorentz and Gauss patterns, and further convolving the two patterns in combination to obtain a Focus-Dart (Voigt) pattern that can interpret the gas absorption spectrum. It should be noted that the above-mentioned line type selection and combination are based on the prior art of TDLAS technology, and the present utility model will not be described in detail.
The utility model can also directly obtain the target gas pattern Buddha-style (Voigt) line form from the measured databases at home and abroad based on the TDLAS technology, wherein the target gas line form comprises but is not limited to SO 2 、NO 2 And (3) waiting for the line type of the gas.
Specifically, the system comprises an infrared laser emission device, an infrared laser receiving device, a light conversion module and a signal processing module, wherein the infrared laser emission device and the infrared laser receiving device are respectively arranged on two sides of the flue, and the infrared laser emission device and the infrared laser receiving device are oppositely arranged, so that the infrared laser receiving device can receive infrared laser emitted by the infrared laser emission device.
The infrared laser emission device comprises an emission port, an emission channel is arranged below the emission port, a quartz window layer is arranged in the corresponding emission channel, a laser collimator is arranged in the emission channel of the infrared laser emission device and used for adjusting the emitted infrared laser angle, the bottom of the infrared laser emission device is also communicated with an optical fiber, and the optical fiber is used for transmitting infrared laser with a selected wavelength and externally emits through the infrared laser emission device.
It is worth mentioning that the emission mouth edge of infrared laser emission device is equipped with the ash removal air flue of transverse arrangement, the air pump is connected to the ash removal air flue, the ash removal air flue is in the both ends of emission mouth have an opening respectively, when the air pump during operation, the air current in the ash removal air flue is from an opening blowout, another opening of ash removal air flue can be absorbed the air current on the emission mouth, thereby make keep certain air current to flow on the emission mouth, can avoid impurity such as dust to gather on the emission mouth effectively, and is similarly be equipped with on the infrared laser receiving mouth with the ash removal air flue of emission mouth the same structure. So that dust and the like are prevented from collecting on the receiving port.
The infrared laser receiving device comprises an infrared laser receiving device, wherein a receiving port of the infrared laser receiving device is internally provided with a receiving channel, a quartz window layer is arranged in the receiving channel, and particularly, in order to make the collected laser signals clearer, a filter plate and a focusing lens are arranged in the receiving channel, and the filter plate can effectively filter light with impurity wavelengths in the environment.
The focusing lens can collect scattered infrared laser and can effectively improve the effect of light detection.
The system includes an optical conversion module including, but not limited to, a photodetector, which in one preferred embodiment of the utility model is disposed at the bottom of the receiving channel, the photodetector being configured to convert the received optical signal into an electrical signal, and a coaxial cable configured to upload the converted electrical signal.
The system also comprises an infrared laser compensation module, wherein the infrared laser compensation module is connected with the light conversion module and used for compensating wavelength drift of infrared laser in the receiving channel for correction, and the infrared laser compensation module comprises but is not limited to a temperature regulating device and corrects laser wavelength drift by increasing or decreasing the temperature of the received infrared laser.
The system also comprises a signal processing module, wherein the signal processing module can be composed of a CPU (central processing unit) with a data processing function, the signal processing module is connected with the light conversion module and is used for carrying out data processing on the electric signals converted by the light conversion module, the TDLAS technology is adopted in the data processing method, the specific wavelength absorption spectrum line type is calculated, whether corresponding gas exists or not is judged according to the absorption spectrum line type, and the concentration of the corresponding gas is calculated according to the absorption rate.
The photoelectric detector is also used for performing gain processing on the received infrared laser and improving the light intensity of the received infrared laser, so that the light conversion effect can be better.
Further, the photoelectric detector further comprises a wavelength calibration module, the wavelength calibration module obtains standard wavelengths of the absorption spectrum corresponding to the target detection gas, and the infrared laser emitted by the laser emitting device is adjusted so that the emitted infrared laser meets the wavelength required by the target detection gas.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present utility model. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.
It will be understood by those skilled in the art that the embodiments of the present utility model described above and shown in the drawings are merely illustrative and not restrictive of the current utility model, and that this utility model has been shown and described with respect to the functional and structural principles thereof, without departing from such principles, and that any modifications or adaptations of the embodiments of the utility model may be possible and practical.
Claims (9)
1. A power plant boiler flue gas monitoring system, comprising:
an infrared laser emitting device;
an infrared laser receiving device;
an optical conversion module;
a signal processing module;
the infrared laser emission device and the infrared laser receiving device are respectively arranged at two sides of the flue, the optical conversion module is connected with the infrared laser receiving device, and the signal processing module is connected with the optical conversion module and used for analyzing and processing the acquired data;
the infrared laser emission device and the infrared laser receiving device are respectively provided with an ash removal air passage, the ash removal air passages are respectively arranged at the openings of the infrared laser emission device and the infrared laser receiving device, the ash removal air passages are transversely arranged, and the ash removal air passages are connected with an air pump and are used for respectively forming movable air flows through the infrared laser emission device and the infrared laser receiving device.
2. The power plant boiler flue gas monitoring system according to claim 1, wherein the infrared laser emitting device and the infrared laser receiving device are respectively arranged oppositely, an emitting port of the infrared laser emitting device is opposite to a receiving port of the infrared laser receiving device, the infrared laser emitting device is connected with an optical fiber, and the optical fiber is used for transmitting infrared laser with preset wavelength to the infrared laser emitting device.
3. A plant boiler flue gas monitoring system according to claim 1, wherein the infrared laser emitting device comprises a laser collimator arranged in the emission channel of the infrared laser emitting device.
4. The power plant boiler flue gas monitoring system according to claim 1, wherein quartz window layers are respectively arranged in the emitting ports of the infrared laser emitting device and the infrared laser receiving device.
5. The power plant boiler flue gas monitoring system according to claim 4, wherein the light conversion module comprises a photoelectric detector, and the photoelectric detector is arranged at the bottom of the infrared laser receiving device and is used for converting received infrared laser into an electric signal.
6. The power plant boiler flue gas monitoring system according to claim 5, wherein the input end of the photoelectric detector is connected with the receiving channel, and the output end of the photoelectric detector is connected with the signal processing module, and the signal processing module is used for analyzing the flue gas components and the concentration.
7. The power plant boiler flue gas monitoring system according to claim 6, wherein a focusing lens is arranged in the receiving channel of the infrared laser receiving device, and the focusing lens is arranged near the end of the photoelectric detector.
8. The utility boiler flue gas monitoring system of claim 7, wherein a filter is disposed in a receiving channel of the infrared laser receiving device, wherein the filter is disposed between the quartz window layer and a focusing lens for focusing the incident infrared laser, and wherein the laser emitting device comprises a laser self-calibration sensor for self-calibration of the infrared laser emission.
9. A plant boiler flue gas monitoring system according to claim 1, wherein the system comprises a wavelength calibration module for calibrating the infrared laser emission wavelength.
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| CN202120630775.2U CN218974167U (en) | 2021-03-29 | 2021-03-29 | Boiler flue gas monitoring system of power plant |
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| CN202120630775.2U CN218974167U (en) | 2021-03-29 | 2021-03-29 | Boiler flue gas monitoring system of power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858207A (en) * | 2021-03-29 | 2021-05-28 | 浙江浙能嘉华发电有限公司 | Power plant boiler flue gas monitoring system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858207A (en) * | 2021-03-29 | 2021-05-28 | 浙江浙能嘉华发电有限公司 | Power plant boiler flue gas monitoring system and method |
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