CN114964652A - Air preheater section air leakage rate online monitoring system and method - Google Patents
Air preheater section air leakage rate online monitoring system and method Download PDFInfo
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- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The invention relates to an air preheater section air leakage rate on-line monitoring system and a method, wherein the system comprises a sampling device group, a sample gas mixing module group, a condensing module group, a TDLAS oxygen amount on-line monitoring device group and an air pumping module group for providing power for smoke gas flowing for the whole system; the sampling device group carries out multi-point sampling on the cross section of an inlet flue of the air preheater and the cross section of an outlet flue of the air preheater and transmits sampled flue gas to the sample gas mixing module group for mixing, and the mixed flue gas is transmitted to the condensing module group for condensing and dewatering, and then the sampled flue gas is transmitted to the TDLAS oxygen content online monitoring device group through the gas extraction module group; the TDLAS oxygen online monitoring device respectively monitors oxygen amount in flue gas sampled at the inlet flue section and the outlet flue section of the air preheater, and calculates air leakage rate of the section of the air preheater through the oxygen amount in the flue gas sampled at the inlet flue section and the outlet flue section of the air preheater. This application is based on TDLAS technique, improves air preheater air leakage rate on-line monitoring precision.
Description
Technical Field
The invention relates to the technical field of industrial air leakage rate monitoring, in particular to an air preheater section air leakage rate on-line monitoring system and method.
Background
In the prior art, the air leakage rate of the air preheater is monitored on line by depending on the measured value of a zirconia sensor, zirconia is only a single measuring point, the structure of the zirconia sensor is complex, a zirconia tube at the core of the zirconia sensor is arranged in a miniature electric furnace and is positioned at the top end of the whole probe, the zirconia tube needs ideal conditions for measurement to be more accurate, the actual application conditions and the field conditions are not ideal, and the accuracy of the zirconia probe and the service life of the probe can be seriously influenced by different conditions; in addition, the oxygen amount is not uniformly distributed on the cross sections of the front and rear flues of the air preheater, and a single measuring point has no representativeness; in summary, the air leakage rate monitoring of the existing air pre-heater has the problems of other gas interference, low measurement precision, short service life of a sensor, poor single-point measurement representativeness and the like.
Disclosure of Invention
The application provides an air preheater section air leakage rate on-line monitoring system and method, which are used for at least solving the problems of other gas interference, low measurement precision, short service life of a sensor, poor single-point measurement representativeness and the like in air preheater air leakage rate monitoring in the related technology.
The embodiment of the first aspect of the application provides an air preheater cross-section air leakage rate on-line monitoring system, the system includes:
the system comprises a sampling device group, a sample gas mixing module group, a condensing module group, an air pumping module group and a TDLAS oxygen on-line monitoring device group which are connected in sequence;
the sampling device group is arranged at the section of the inlet flue of the air preheater and the section of the outlet flue of the air preheater and is used for sampling the flue gas at the section of the inlet flue of the air preheater and the section of the outlet flue of the air preheater at multiple points and transmitting the sampled flue gas to the sample gas mixing module group;
the sample gas mixing module group is used for uniformly mixing the sampled flue gas, and the uniformly mixed flue gas is transmitted to the condensing module group for condensation and dehydration;
the gas extraction module group is used for providing power for the whole system to flow the flue gas, and the flue gas at the inlet flue of the air preheater and the outlet flue of the air preheater is subjected to multipoint sampling through the sampling device group under the action of the gas extraction module group and is transmitted to the TDLAS oxygen content online monitoring device group through the sample gas mixing module group, the condensing module group and the gas extraction module group in sequence;
TDLAS oxygen volume on-line monitoring device group for oxygen volume in the flue gas of sampling is located and air preheater export flue cross-section to air preheater entry flue cross-section respectively and monitors, calculates air preheater cross-section rate of leaking out through the oxygen volume in the flue gas of air preheater entry flue cross-section department and air preheater export flue cross-section department sample.
The embodiment of the second aspect of the application provides an air preheater section air leakage rate online monitoring method, which includes:
step 1: connecting and installing a sampling device group, a sample gas mixing module group, a condensing module group, an air pumping module group and a TDLAS oxygen amount online monitoring device group;
step 2: partitioning the section of an inlet flue of the air preheater, installing an inlet sampling probe at an inlet in each partition, partitioning the section of an outlet flue of the air preheater, and installing an outlet sampling probe at an inlet in each partition;
and step 3: starting the air pumping module group;
and 4, step 4: monitoring and recording oxygen quantity A of the inlet flue section of the air preheater obtained by a first TDLAS oxygen quantity online monitoring device and oxygen quantity B of the outlet flue section of the air preheater obtained by a second TDLAS oxygen quantity online monitoring device;
and 5: and obtaining the air leakage rate C according to the oxygen amount A at the section of the inlet flue of the air preheater and the oxygen amount B at the section of the outlet flue of the air preheater.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the invention provides an air preheater section air leakage rate on-line monitoring system and a method, wherein the system comprises: the system comprises a sampling device group, a sample gas mixing module group, a condensing module group, an air pumping module group and a TDLAS oxygen amount online monitoring device group which are connected in sequence; the sampling device group is arranged at the section of the inlet flue of the air preheater and the section of the outlet flue of the air preheater and is used for sampling the flue gas at the section of the inlet flue of the air preheater and the section of the outlet flue of the air preheater at multiple points and transmitting the sampled flue gas to the sample gas mixing module group; the sample gas mixing module group is used for uniformly mixing sampled flue gas, and the uniformly mixed flue gas is transmitted to the condensing module group for condensation and dehydration; the gas extraction module group is used for providing power for the whole system to flow the flue gas, and the flue gas at the inlet flue of the air preheater and the outlet flue of the air preheater is subjected to multipoint sampling through the sampling device group under the action of the gas extraction module group and is transmitted to the TDLAS oxygen content online monitoring device group through the sample gas mixing module group, the condensing module group and the gas extraction module group in sequence; TDLAS oxygen volume on-line monitoring device group for oxygen volume in the flue gas of sampling is located and air preheater export flue cross-section to air preheater entry flue cross-section respectively and monitors, calculates air preheater cross-section rate of leaking out through the oxygen volume in the flue gas of air preheater entry flue cross-section department and air preheater export flue cross-section department sample. This application is based on TDLAS technique for air preheater cross-section rate of leaking out on-line monitoring precision is higher, and the life-span is longer, has brought economic benefits simultaneously.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a structural diagram of an air preheater cross-section air leakage rate online monitoring system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an on-line TDLAS oxygen amount monitoring device in an on-line air leakage rate monitoring system for a cross section of an air preheater according to an embodiment of the present application;
fig. 3 is a flowchart of an online monitoring method for the air leakage rate of the cross section of the air preheater according to an embodiment of the present application.
Description of reference numerals:
an inlet sampling probe-1; a first heat trace line-201; second heat trace line-202 third heat trace line-203; a fourth satellite line-204; a first sample gas mixing module-3; a first condensing module-4; a first air extraction module-5; a first TDLAS oxygen amount online monitoring device-6; an outlet sampling probe-7; a second sample gas mixing module-8; a second condensing module-9; a second air extraction module-10; a second TDLAS oxygen amount online monitoring device-11; an air preheater inlet flue-12; an air preheater outlet flue-13; a photodetector-14; white pool-15; a main control module-16; an interface module-17; a collimator-18.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology, which is a prior art and will not be described herein in any detail.
The application provides an air preheater cross-section air leakage rate on-line monitoring system and method, the system includes: the system comprises a sampling device group, a sample gas mixing module group, a condensing module group, an air pumping module group and a TDLAS oxygen amount online monitoring device group which are connected in sequence; the sampling device group is arranged at the section of the inlet flue 12 of the air preheater and the section of the outlet flue 13 of the air preheater and is used for sampling the smoke at the sections of the inlet flue 12 and the outlet flue 13 of the air preheater at multiple points and transmitting the sampled smoke to the sample gas mixing module group; the sample gas mixing module group is used for uniformly mixing the sampled flue gas, and the uniformly mixed flue gas is transmitted to the condensing module group for condensation and dehydration; the gas extraction module group is used for providing the power for the flow of the flue gas for the whole system, the flue gas at the inlet flue section of the air preheater and the outlet flue section of the air preheater is subjected to multipoint sampling through the sampling device group under the action of the gas extraction module group, and is transmitted to the TDLAS oxygen content online monitoring device group through the sample gas mixing module group, the condensation module group and the gas extraction module group in sequence; TDLAS oxygen volume on-line monitoring device group for oxygen volume in the flue gas of sampling is located and 13 cross-sections of air preheater export flue 12 cross-sections of air preheater respectively monitors, calculates air preheater cross-section air leakage rate through the oxygen volume in the flue gas of sampling of air preheater export flue 13 cross-sections of air preheater entry flue 12 cross-sections department. This application is based on TDLAS technique for air preheater air leakage rate on-line monitoring precision is higher, and the life-span is longer, has brought economic benefits simultaneously.
Example 1
Fig. 1 is a structural diagram of an air preheater cross-section air leakage rate online monitoring system provided in an embodiment of the present disclosure, and as shown in fig. 1, the apparatus includes:
the system comprises a sampling device group, a sample gas mixing module group, a condensing module group, an air pumping module group and a TDLAS oxygen amount online monitoring device group which are connected in sequence;
the sampling device group is arranged at the section of the inlet flue 12 of the air preheater and the section of the outlet flue 13 of the air preheater and is used for carrying out multi-point sampling on the smoke at the section of the inlet flue 12 of the air preheater and the section of the outlet flue 13 of the air preheater and transmitting the sampled smoke to the sample gas mixing module group;
the sample gas mixing module group is used for uniformly mixing the sampled flue gas, and the uniformly mixed flue gas is transmitted to the condensing module group for condensation and dehydration;
the system comprises an air preheater inlet flue 12, an air preheater outlet flue 13, a sample gas mixing module group, a condensing module group and an air preheater on-line monitoring device group, wherein the air preheater inlet flue 12 and the air preheater outlet flue 13 are respectively connected with a sampling device group through a pipeline;
TDLAS oxygen volume on-line monitoring device group for oxygen volume in the flue gas of sampling is located and 13 cross-sections of air preheater inlet flue 12 cross-sections and air preheater outlet flue respectively monitors, calculates air preheater cross-section air leakage rate through the oxygen volume in the flue gas of air preheater inlet flue 12 and outlet flue 13 department sampling.
In an embodiment of the present disclosure, the sampling device set includes an inlet sampling device and an outlet sampling device; the inlet sampling device is arranged at the section of the inlet flue 12 of the air preheater and is used for sampling the smoke at the section of the inlet flue 12 of the air preheater in a multi-point manner; the outlet sampling device is arranged on the section of the outlet flue 13 of the air preheater and is used for carrying out multipoint sampling on the flue gas on the section of the outlet flue 13 of the air preheater.
The inlet sampling device comprises a plurality of inlet sampling probes 1, a plurality of inlet flue sampling areas for sampling are preset at the section of an inlet flue 12 of the air preheater, and the plurality of inlet sampling probes 1 are respectively arranged in the inlet sampling areas so as to perform multi-point sampling on the flue gas at the section of the inlet flue 12 of the air preheater;
the outlet sampling device comprises a plurality of outlet sampling probes 7, a plurality of outlet flue sampling areas for sampling are preset at the section of the outlet flue 13 of the air preheater, and the outlet sampling probes 7 are respectively arranged in the outlet sampling areas preset at the section of the outlet flue 13 of the air preheater so as to perform multipoint sampling on the flue gas at the section of the outlet flue 13 of the air preheater.
In the embodiment of the present disclosure, the sample gas mixing module set includes a first sample gas mixing module 3 corresponding to the inlet sampling device and a second sample gas mixing module 8 corresponding to the outlet sampling device.
The first sample gas mixing module 3 is communicated with the inlet sampling device through a first heat tracing pipe group, and the flue gas sampled by the inlet sampling device is transmitted to the first sample gas mixing module 3 through the first heat tracing pipe group; the second sample gas mixing module 8 is communicated with the outlet sampling device through a third heat tracing pipe group, and the flue gas sampled by the outlet sampling device is transmitted to the second sample gas mixing module 8 through the third heat tracing pipe group.
Specifically, the first heat tracing pipe group comprises a plurality of first heat tracing pipes 201, the first heat tracing pipes 201 are used for carrying out heat preservation and heat tracing on passing flue gas, the first heat tracing pipes 201 correspond to the inlet sampling probes 1 one by one, two ends of each first heat tracing pipe 201 are respectively connected with the inlet sampling probes 1 and the first sample gas mixing module 3, each inlet sampling probe 1 carries out flue gas sampling in an inlet sampling area corresponding to the section of the inlet flue 12 of the air preheater, and the sampled flue gas sequentially passes through the inlet sampling probes 1 and the first heat tracing pipes 201 and enters the first sample gas mixing module 3 for mixing;
the third heat tracing pipeline set comprises a plurality of third heat tracing pipelines 203, the third heat tracing pipelines 203 are used for carrying out heat preservation and heat tracing on passing smoke, the third heat tracing pipelines 203 correspond to the outlet sampling probes 7 one by one, two ends of each third heat tracing pipeline 203 are respectively connected with the outlet sampling probe 7 and the second sample gas mixing module 7, each outlet sampling probe 7 carries out smoke sampling in an outlet sampling area corresponding to the section of the outlet flue 13 of the air preheater, and the sampled smoke enters the second sample gas mixing module 8 to be mixed sequentially through the outlet sampling probes 7 and the second heat tracing pipelines 203.
In an embodiment of the present disclosure, the condensing module group includes: a first condensation module 4 corresponding to the first sampling device and a second condensation module 9 corresponding to the second sampling device; the first condensation module 4 is connected with the first sample gas mixing module 3 through a second heat tracing pipeline, the flue gas in the first sample gas mixing module 3 enters the first condensation module 4 through the second heat tracing pipeline 202 to be condensed and dewatered, and the second heat tracing pipeline 202 carries out heat preservation and heat tracing on the flue gas before entering the first condensation module 4; the second condensing module 9 is connected with the second sample gas mixing module 8 through a fourth heat tracing pipeline 204, flue gas in the second sample gas mixing module 8 enters the second condensing module 9 through the fourth heat tracing pipeline 204 to be condensed and dewatered, and the fourth heat tracing pipeline 204 performs heat preservation and heat tracing on the flue gas before entering the second condensing module 9.
In the embodiment of the present disclosure, the air pumping module set is used for providing the power for collecting and flowing the flue gas for the whole system, and the air pumping module set includes: a first air extraction module 5 corresponding to the first sampling device and a second air extraction module 10 corresponding to the second sampling device; TDLAS oxygen volume on-line monitoring device group includes first TDLAS oxygen volume on-line monitoring device 6 that corresponds with first sampling device and the second TDLAS oxygen volume on-line monitoring device 11 that corresponds with second sampling device, and wherein first TDLAS oxygen volume on-line monitoring device 6 and second TDLAS oxygen volume on-line monitoring device 11 structure is the same completely.
The input end of the first air extraction module 5 is connected with the first condensation module 4 through a pipeline, the output end of the first air extraction module is connected with the input end of the first TDLAS oxygen amount online monitoring device 6, the first air extraction module 5 is used for providing power for sampling of flue gas at the cross section of the inlet flue 12 of the air preheater and transmission of the sampled flue gas, the flue gas in the inlet flue 12 of the air preheater is subjected to multipoint sampling through the inlet sampling probe 1 under the action of the first air extraction module 5, and the sampled flue gas sequentially passes through the first sample gas mixing module 3, the first condensation module 4 and the first air extraction module 5, enters the first TDLAS oxygen amount online monitoring device 6 and is subjected to oxygen amount monitoring through the first TDLAS oxygen amount online monitoring device 6 to obtain the oxygen amount in the flue gas at the cross section of the inlet flue 12 of the air preheater;
the second module 10 input of bleeding links to each other through the output of pipeline with second condensation module 9, the output of second module 10 of bleeding links to each other with second TDLAS oxygen content on-line monitoring device 11's input, the second module 10 of bleeding is used for providing power for the transmission of air preheater export flue 13 cross-section department flue gas sample and sample flue gas, 13 cross-section department flue gas of air preheater export flue carries out the multiple spot sample through export sampling probe 7 under the effect of second module 10 of bleeding, the flue gas after the sample loops through second appearance gas mixing module 8, second condensation module 9, second module 10 of bleeding gets into in second TDLAS oxygen content on-line monitoring device 11 and carries out the oxygen content monitoring through second TDLAS oxygen content on-line monitoring device 11, obtain oxygen content in the flue gas in the air preheater export flue 13.
Fig. 2 is according to the structural schematic diagram of the TDLAS oxygen content on-line monitoring device in the air preheater cross-section air leakage rate on-line monitoring system that an embodiment of this application provides, and first TDLAS oxygen content on-line monitoring device 6 and 11 structures of second TDLAS oxygen content on-line monitoring device are the same, and as shown in fig. 2, TDLAS oxygen content on-line monitoring device includes: a white cell 15, a photodetector 14, a main control module 16, an interface module 17, a display module (the display module is not shown in the figure), and a collimator 18.
Specifically, a main control board, a laser controller for controlling the laser, and the like (the laser, the laser controller, and the main control board are not shown in the figure) are arranged in the main control module 16, the laser in the main control module 16 emits laser with a wavelength of 760.6mm, and the main control module 16 is connected with the photodetector 14, the interface module 17, and the display module through cables.
The white cell 15 is provided with an air chamber for holding the flue gas sampled by the sampling device group, and the white cell 15 is the prior art and is not described herein in any more detail. The collimator 18 is arranged at an entrance of the white cell 15, the photoelectric detector 14 is arranged at an exit of the white cell 15, laser emitted by the laser enters the air chamber of the white cell 15 through the collimator 18, and the laser is transmitted to the photoelectric detector 14 through the exit of the white cell 15 after being reflected for multiple times in the air chamber filled with sampling smoke;
Further, write down A with oxygen volume in the 12 cross-sections of air preheater entry flue gas that 6 monitoring of first TDLAS oxygen volume on-line monitoring device obtained, write down B with oxygen volume in 13 cross-sections of air preheater exit flue gas that 11 monitoring of second TDLAS oxygen volume on-line monitoring device obtained, write down C with the rate of air leakage, air leakage rate C's computational formula is as follows:
wherein a1 is the excess air coefficient of the flue gas inlet of the air preheater
a2 is the excess air coefficient of the smoke outlet of the air preheater, and a2 is 20.9 percent(20.9% -B); a1 is the air preheater flue gas inlet excess air ratio.
In summary, the present application provides an air preheater cross-section air leakage rate online monitoring system and method, the system includes: the system comprises a sampling device group, a sample gas mixing module group, a condensing module group, an air pumping module group and a TDLAS oxygen amount online monitoring device group which are connected in sequence; the sampling device group is arranged at an inlet flue 12 and an outlet flue 13 of the air preheater and is used for carrying out multi-point sampling on the smoke at the sections of the inlet flue 12 and the outlet flue 13 of the air preheater and transmitting the sampled smoke to the sample gas mixing module group; the sample gas mixing module group is used for uniformly mixing the sampled flue gas, and the uniformly mixed flue gas is transmitted to the condensing module group for condensation and dehydration; the gas extraction module group is used for providing the power for the flow of the flue gas for the whole system, the flue gas at the cross sections of the inlet flue and the outlet flue of the air preheater is subjected to multi-point sampling through the sampling device group under the action of the gas extraction module group, and is transmitted to the TDLAS oxygen content online monitoring device group through the sample gas mixing module group, the condensation module group and the gas extraction module group in sequence; TDLAS oxygen volume on-line monitoring device group for oxygen volume in the flue gas of sampling is located and 13 cross-sections of air preheater export flue 12 cross-sections of air preheater respectively monitors, calculates air preheater cross-section air leakage rate through the oxygen volume in the flue gas of sampling of air preheater export flue 13 cross-sections of air preheater entry flue 12 cross-sections department. This application is based on TDLAS technique for air preheater air leakage rate on-line monitoring precision is higher, and the life-span is longer, has brought economic benefits simultaneously.
Example 2
Fig. 3 is an online monitoring method for the cross-section air leakage rate of the air preheater provided by the embodiment of the disclosure, and the online monitoring method includes:
step 1: connecting and installing a sampling device group, a sample gas mixing module group, a condensing module group, an air pumping module group and a TDLAS oxygen amount online monitoring device group;
specifically, the sampling device group and the sample gas mixing module group as well as the sample gas mixing module group and the condensing module group are connected through corresponding heat tracing pipelines; the condensing module group is connected with the air exhaust module group, the air exhaust module group and the TDLAS oxygen amount on-line monitoring device through pipelines.
Step 2: partitioning the section of an inlet flue 12 of the air preheater and installing an inlet sampling probe 1 at the inlet in each zone, partitioning the section of an outlet flue 13 of the air preheater and installing an outlet sampling probe 7 at the inlet in each zone;
specifically, it is a plurality of thereby entry sampling probe 1 sets up respectively in each entry sampling area that air preheater entry flue 12 cross-section department was predetermine carries out the multiple spot sample to the flue gas of air preheater entry flue 12 cross-section department, and is a plurality of thereby export sampling probe 7 sets up respectively in each export sampling area that air preheater exit flue 13 cross-section department was predetermine and carries out the multiple spot sample to the flue gas of air preheater exit flue 13 cross-section department.
And 3, step 3: starting the air extraction module group, wherein smoke in the cross section of an inlet flue 12 of the air preheater and the cross section of an outlet flue 13 of the air preheater flows under the power provided by the air extraction module group, namely, the smoke in the inlet flue 12 of the air preheater carries out multipoint sampling through an inlet sampling probe 1, the sampled smoke sequentially passes through a first sample gas mixing module 3, a first condensation module 4 and a first air extraction module 5, enters a first TDLAS oxygen content online monitoring device 6 and carries out oxygen content monitoring through the first TDLAS oxygen content online monitoring device 6, and the oxygen content A in the smoke in the cross section of the inlet flue 12 of the air preheater is obtained;
the flue gas of 13 cross-sections departments of air preheater export flue carries out the multiple spot sample through export sampling probe 7, and the flue gas after the sample loops through second appearance gas mixing module 8, second condensation module 9, second bleed module 10 and gets into in second TDLAS oxygen content on-line monitoring device 11 and carries out the oxygen content monitoring through second TDLAS oxygen content on-line monitoring device 11, obtains oxygen content B in 13 cross-sections departments of air preheater export flue.
And 4, step 4: monitoring and recording first TDLAS oxygen volume on-line monitoring device obtains oxygen volume A of air preheater entry flue cross-section department and second TDLAS oxygen volume on-line monitoring device obtains oxygen volume B of air preheater exit flue cross-section department.
And 5: calculating according to the oxygen quantity A of the inlet flue section of the air preheater and the oxygen quantity B of the outlet flue of the air preheater, and obtaining the air leakage rate C through calculation;
further, the air leakage rate C is calculated as follows:
wherein a1 is the excess air coefficient of the flue gas inlet of the air preheater
a2 is the excess air coefficient of the smoke outlet of the air preheater, and a2 is 20.9% (20.9% -B); a1 is the air preheater flue gas inlet excess air ratio.
In summary, the air preheater section air leakage rate online monitoring method provided by the application is based on the TDLAS technology, so that the air leakage rate online monitoring precision of the air preheater is higher.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. An air preheater section air leakage rate on-line monitoring system is characterized by comprising:
the system comprises a sampling device group, a sample gas mixing module group, a condensing module group, an air pumping module group and a TDLAS oxygen amount online monitoring device group which are connected in sequence;
the sampling device group is arranged at the inlet flue section of the air preheater and the outlet flue section of the air preheater and is used for sampling the flue gas at the inlet flue section of the air preheater and the outlet flue section of the air preheater at multiple points and transmitting the sampled flue gas to the sample gas mixing module group;
the sample gas mixing module group is used for uniformly mixing the sampled flue gas, and the uniformly mixed flue gas is transmitted to the condensing module group for condensation and dehydration;
the gas extraction module group is used for providing power for the whole system to flow the flue gas, and the flue gas at the inlet flue of the air preheater and the outlet flue of the air preheater is subjected to multipoint sampling through the sampling device group under the action of the gas extraction module group and is transmitted to the TDLAS oxygen content online monitoring device group through the sample gas mixing module group, the condensing module group and the gas extraction module group in sequence;
TDLAS oxygen volume on-line monitoring device group for oxygen volume in the flue gas of air preheater entry flue cross-section department and air preheater export flue cross-section department sample respectively monitors, calculates air preheater cross-section air leakage rate through the oxygen volume in the flue gas of air preheater entry flue cross-section department and air preheater export flue cross-section department sample.
2. The system of claim 1, wherein the sampling device set comprises an inlet sampling device and an outlet sampling device;
the inlet sampling device is arranged at the section of the inlet flue of the air preheater and is used for sampling the smoke at the section of the inlet flue of the air preheater in a multi-point manner;
the outlet sampling device is arranged at the section of the outlet flue of the air preheater and is used for carrying out multipoint sampling on the smoke at the section of the outlet flue of the air preheater.
3. The device according to claim 2, wherein the inlet sampling device comprises a plurality of inlet sampling probes, and the plurality of inlet sampling probes are arranged in each inlet sampling area preset at the section of the inlet flue of the air preheater to perform multipoint sampling on the flue gas in the inlet flue of the air preheater;
the outlet sampling device comprises a plurality of outlet sampling probes, and the outlet sampling probes are arranged in each outlet sampling area preset at the cross section of the outlet flue of the air preheater to perform multipoint sampling on the smoke in the outlet flue of the air preheater.
4. The system of claim 1, wherein the set of sample gas mixing modules comprises a first sample gas mixing module and a second sample gas mixing module;
the first sample gas mixing module is communicated with the inlet sampling device through a first heat tracing pipe group, and the flue gas sampled by the inlet sampling device is transmitted to the first sample gas mixing module through the first heat tracing pipe group;
the second sample gas mixing module is communicated with the outlet sampling device through a third heat tracing pipe group, and the flue gas sampled by the outlet sampling device is transmitted to the second sample gas mixing module through the third heat tracing pipe group.
5. The system according to claim 4, wherein the first heat tracing pipe group comprises a plurality of first heat tracing pipes for heat preservation and heat tracing of passing flue gas, the first heat tracing pipes correspond to the inlet sampling probes one by one, two ends of each first heat tracing pipe are respectively connected with the inlet sampling probes and the first sample gas mixing module, each inlet sampling probe samples flue gas in an inlet sampling area corresponding to the inlet flue of the air preheater, and the sampled flue gas enters the first sample gas mixing module to be mixed sequentially through the inlet sampling probes and the first heat tracing pipes;
the third heat tracing pipe group comprises a plurality of third heat tracing pipes for heat preservation and heat tracing of passing smoke, the third heat tracing pipes correspond to the outlet sampling probes one to one, two ends of each third heat tracing pipe are respectively connected with the outlet sampling probes and the second sample gas mixing module, each outlet sampling probe samples smoke in an outlet sampling area corresponding to the outlet flue of the air preheater, and the sampled smoke sequentially passes through the outlet sampling probes and the second heat tracing pipes to enter the second sample gas mixing module for mixing.
6. The system of claim 1, wherein the set of condensing modules comprises: the first condensation module and the second condensation module;
the first condensation module is connected with the first gas mixing module through a second heat tracing pipeline, smoke in the first gas mixing module enters the first condensation module through the second heat tracing pipeline to be condensed and dewatered, and the second heat tracing pipeline carries out heat preservation and heat tracing on the smoke before entering the first condensation module;
the second condensing module is connected with the second sample gas mixing module through a fourth heat tracing pipeline, smoke in the second sample gas mixing module enters the second condensing module through the fourth heat tracing pipeline to be condensed and dewatered, and the fourth heat tracing pipeline performs heat preservation and heat tracing on the smoke before entering the second condensing module.
7. The system of claim 1, wherein the set of gas extraction modules comprises: the first air extraction module and the second air extraction module; the TDLAS oxygen amount on-line monitoring device group comprises a first TDLAS oxygen amount on-line monitoring device and a second TDLAS oxygen amount on-line monitoring device which are identical in structure;
the input end of the first air extraction module is connected with the first condensation module through a pipeline, the output end of the first air extraction module is connected with the first TDLAS oxygen content online monitoring device, the first air extraction module is used for providing power for sampling flue gas in an inlet flue of the air preheater and transmitting the sampled flue gas, the flue gas at the cross section of the inlet flue of the air preheater is subjected to multipoint sampling through the inlet sampling probe under the action of the first air extraction module, the sampled flue gas sequentially passes through the first sample gas mixing module, the first condensation module and the first air extraction module to enter the first TDLAS oxygen content online monitoring device for oxygen content monitoring, and the oxygen content in the flue gas at the cross section of the inlet flue of the air preheater is obtained;
the second module input of bleeding links to each other through pipeline and second condensation module, the output links to each other with second TDLAS oxygen content on-line monitoring device, the second module of bleeding is used for providing power for the transmission of air preheater export flue cross-section department flue gas sample and sample flue gas, the flue gas carries out the multiple spot sample through export sampling probe in the air preheater export flue under the second module effect of bleeding, flue gas after the sample loops through second appearance gas mixing module, the second condensation module, the second module of bleeding carries out the oxygen content monitoring in getting into second TDLAS oxygen content on-line monitoring device, obtain oxygen content in air preheater export flue cross-section department flue gas.
8. The system of claim 7, wherein each TDLAS oxygen online monitoring device comprises: the system comprises a white cell, a photoelectric detector, a main control module, an interface module and a display module;
the main control module is connected with the photoelectric detector, the interface module and the display module, and a laser, a laser controller and a main control board are arranged in the main control module;
the white cell is internally provided with an air chamber for containing the flue gas sampled by the sampling device group, and the laser emits laser light which enters the white cell and is transmitted to the photoelectric detector after being reflected for multiple times in the air chamber filled with the sampled flue gas;
the photoelectric detector is used for converting the received laser signals into electric data signals and transmitting the electric data signals to the main control module for carrying out data acquisition and oxygen amount calculation on the laser signals;
the interface module is used for storing the oxygen amount information calculated by the main control module;
and the display module displays the oxygen amount information calculated by the main control module.
9. The online monitoring method of the online monitoring system for the section air leakage rate of the air preheater according to any one of the preceding claims 1 to 8, wherein the method comprises the following steps:
connecting and installing a sampling device group, a sample gas mixing module group, a condensing module group, an air pumping module group and a TDLAS oxygen on-line monitoring device group;
partitioning an inlet flue of the air preheater, installing an inlet sampling probe at an inlet in each region, partitioning an outlet flue of the air preheater, and installing an outlet sampling probe at an inlet in each region;
starting the air pumping module group;
monitoring and recording oxygen quantity A of the inlet flue section of the air preheater obtained by a first TDLAS oxygen quantity online monitoring device and oxygen quantity B of the outlet flue section of the air preheater obtained by a second TDLAS oxygen quantity online monitoring device;
and obtaining the air leakage rate C according to the oxygen amount A at the section of the inlet flue of the air preheater and the oxygen amount B at the section of the outlet flue of the air preheater.
10. The method of claim 8, wherein the monitoring and recording the oxygen content A of the first TDLAS oxygen online monitoring device at the cross section of the inlet flue of the air preheater and the oxygen content B of the second TDLAS oxygen online monitoring device at the cross section of the outlet flue of the air preheater comprises:
the method comprises the following steps that flue gas in an inlet flue of the air preheater is subjected to multipoint sampling through an inlet sampling probe, the sampled flue gas sequentially passes through a first sample gas mixing module, a first condensing module and a first air extraction module and enters a first TDLAS oxygen content online monitoring device for oxygen content monitoring, and oxygen content A in the flue gas at the section of the inlet flue of the air preheater is obtained;
flue gas carries out the multiple spot sample through export sampling probe in the air preheater export flue, and the flue gas after the sample loops through second appearance gas mixing module, second condensation module, second bleed module and gets into and carry out the oxygen content monitoring in the second TDLAS oxygen content on-line monitoring device, obtains flue gas cross-section department oxygen content B in the air preheater export flue.
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