CN107632119B - Comparison device for ammonia escape monitoring instrument and application method thereof - Google Patents
Comparison device for ammonia escape monitoring instrument and application method thereof Download PDFInfo
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- CN107632119B CN107632119B CN201710900523.5A CN201710900523A CN107632119B CN 107632119 B CN107632119 B CN 107632119B CN 201710900523 A CN201710900523 A CN 201710900523A CN 107632119 B CN107632119 B CN 107632119B
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- temperature
- sampling
- instrument
- flue gas
- smoke
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 27
- 238000012544 monitoring process Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 78
- 239000000779 smoke Substances 0.000 claims abstract description 37
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003546 flue gas Substances 0.000 claims abstract description 25
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 20
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 239000003365 glass fiber Substances 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000003556 assay Methods 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a comparison device for an ammonia escape monitoring instrument and a use method thereof, wherein the comparison device comprises a flue gas sampling rod, a comparison branch sampling rod, a filtering device, a temperature thermocouple, a three-way joint, an electromagnetic angle valve and a temperature measurement control unit, wherein the flue gas sampling rod is inserted into a flue; one end of the temperature thermocouple is welded into the filter device in a sealing way and is used for measuring the temperature of the flue gas passing through the filter device; the temperature measurement control unit is in wireless connection with the temperature thermocouple, the electromagnetic angle valve and the smoke sampling instrument and is used for controlling the electromagnetic angle valve and the smoke sampling instrument to work according to the temperature measured by the temperature thermocouple. The invention solves the problem that the ammonia escape monitoring instrument cannot be compared and verified regularly to be accurate.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a comparison device for an ammonia escape monitoring instrument and a use method thereof.
Background
Selective non-catalytic reduction (SNCR) and Selective Catalytic Reduction (SCR) are the main methods for flue gas denitration. In order to monitor the SNCR and the SCR operation state, online monitoring of the NH3 content in the flue gas is required.
In the related art, an ammonia escape monitoring instrument is often adopted to perform online monitoring on the NH3 content in the flue gas, and because the ammonia escape monitoring instrument extracts the flue gas with stronger corrosiveness for a long time and the NH3 content in the flue gas is lower, the accuracy of an output measurement result is poor, and the ammonia escape monitoring instrument is required to be detected and calibrated.
At present, the ammonia escape monitoring instrument is lack of a convenient and reliable technical method for detection and calibration, a power plant technician cannot calibrate and compare the ammonia escape monitoring instrument through a standard gas comparison method in daily work, and the accuracy of the ammonia escape monitoring instrument cannot be verified and calibrated in daily work.
Disclosure of Invention
In view of the above, the present invention provides an alignment device for ammonia slip monitoring meters and a method of using the same.
The aim of the invention is realized by adopting the following technical scheme:
the utility model provides a compare device for ammonia escape monitoring instrument, including flue gas sampling rod, compare branch road sampling rod, filter equipment, temperature thermocouple, three way connection, electromagnetic angle valve, temperature measurement control unit, the flue gas sampling rod inserts in the flue, and the flue gas sampling rod exposes the part of flue and sets up two exports, connects ammonia escape monitoring instrument respectively, compares branch road sampling rod, filter equipment's entry linkage compares branch road sampling rod, and filter equipment's exit linkage three way connection's entry, a smoke and dust sampling instrument is connected to three way connection's ordinary export, and three way connection's free exit linkage aspiration pump sets up electromagnetic angle valve between free exit and the aspiration pump; one end of the temperature thermocouple is welded into the filter device in a sealing way and is used for measuring the temperature of the flue gas passing through the filter device; the temperature measurement control unit is in wireless connection with the temperature thermocouple, the electromagnetic angle valve and the smoke sampling instrument and is used for controlling the electromagnetic angle valve and the smoke sampling instrument to work according to the temperature measured by the temperature thermocouple.
Preferably, the filtering device comprises a superfine glass fiber gel-free filter cylinder, an opening for inserting a temperature thermocouple is formed in the space cylinder wall of the superfine glass fiber gel-free filter cylinder outlet, the temperature thermocouple is welded with the periphery of the opening in a sealing manner, a porous partition plate is arranged in the space cylinder wall and used for supporting the tail part of the superfine glass fiber gel-free filter cylinder and isolating a space inside the filtering device for inserting the temperature thermocouple.
Preferably, the outer surface of the flue gas sampling rod is provided with a heat preservation sleeve capable of resisting 200 ℃.
Further, a bracket for stably placing two 250ml bubble absorbing bottles is fixedly arranged near the free outlet of the three-way joint.
The invention also provides a using method for the comparison device, which specifically comprises the following steps:
s1, installing a filter element in a filter device, placing two bubble sampling bottles filled with absorption liquid on a bracket, and connecting the two bubble sampling bottles with a smoke sampling instrument;
s2, starting an air pump, detecting the temperature of the flue gas by a temperature measurement control unit through a temperature measurement thermocouple, sending a control signal by the temperature measurement control unit when the temperature of the flue gas reaches a set temperature threshold value, starting an electromagnetic angle valve, starting a smoke sampling instrument, stopping the smoke sampling instrument after running for a set period of time, and closing the electromagnetic angle valve;
s3, closing the air pump and recording the sampling amount;
and S4, after sampling is finished, the bubble sampling bottle is retracted, and assay analysis is carried out according to the relevant protocol.
The ammonia escape data of the ammonia escape monitoring instrument are continuously recorded while sampling is carried out, and then the ammonia escape data are compared with ammonia escape data obtained through laboratory test calculation. For reliable alignment, multiple alignments may be performed for verification.
The beneficial effects of the invention are as follows: the comparison device for the ammonia escape monitoring instrument realizes detection and calibration of the ammonia escape monitoring instrument, and is simple in installation and convenient and fast to use.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is a schematic diagram of the structural connection of one embodiment of the present invention;
FIG. 2 is an enlarged schematic view of a filter device coupled to a thermocouple according to one embodiment of the present invention;
reference numerals:
the smoke sampling rod 1, the comparison branch sampling rod 2, the filtering device 3, the temperature thermocouple 4, the three-way joint 5, the electromagnetic angle valve 6, the temperature measurement control unit 7, the smoke sampling instrument 8, the air pump 9, the heat preservation sleeve 10, the bracket 11, the opening 12 and the porous partition 13.
Detailed Description
The invention will be further described with reference to the following examples.
Referring to fig. 1, the comparison device for an ammonia escape monitoring instrument provided in this embodiment includes a smoke sampling rod, a comparison branch sampling rod, a filtering device, a temperature thermocouple, a three-way joint, an electromagnetic angle valve, and a temperature measurement control unit, wherein the smoke sampling rod is inserted into a flue, two outlets are disposed at a portion of the smoke sampling rod exposed out of the flue, the ammonia escape monitoring instrument and the comparison branch sampling rod are respectively connected, an inlet of the filtering device is connected with the comparison branch sampling rod, an outlet of the filtering device is connected with an inlet of the three-way joint, a common outlet of the three-way joint is connected with a smoke sampling instrument, a free outlet of the three-way joint is connected with an air pump, and the electromagnetic angle valve is disposed between the free outlet and the air pump; one end of the temperature thermocouple is welded into the filter device in a sealing way and is used for measuring the temperature of the flue gas passing through the filter device; the temperature measurement control unit is in wireless connection with the temperature thermocouple, the electromagnetic angle valve and the smoke sampling instrument and is used for controlling the electromagnetic angle valve and the smoke sampling instrument to work according to the temperature measured by the temperature thermocouple.
When the measured temperature of the temperature thermocouple is higher than a set temperature threshold, the temperature measurement control unit controls the electromagnetic angle valve to be opened, the smoke sampling instrument is started, the smoke sampling instrument automatically stops after extracting smoke with set time, and the temperature measurement control unit controls the electromagnetic angle valve to be closed after recording the extracted smoke quantity.
In the above embodiment, the smoke sampling instrument is started to sample after the temperature of the smoke is higher than a certain temperature, and the smoke sampling instrument needs to record the sampling quantity. The air pump is arranged, so that a pipeline can be preheated before the smoke sampling instrument is started, the smoke sampling instrument reaches the sampling temperature, and the sampling error is reduced. In addition, the air pump works simultaneously during sampling, so that the pipeline can be continuously heated at a large flow, and the problem that the smoke dust sampling instrument cannot be cooled too fast to reach the sampling temperature due to low flow of the pipeline during sampling is avoided.
As a preferred embodiment, the set temperature threshold is 150 ℃.
In one embodiment, a bracket for stably placing two 250ml bubble absorbing bottles is fixedly arranged near the free outlet of the three-way joint. In practice, the bracket may be placed in a position selected to be adjacent to the free outlet of the three-way fitting.
In one embodiment, the outer surface of the smoke sampling rod is provided with a heat preservation sleeve capable of resisting 200 ℃.
In one embodiment, as shown in fig. 2, the filtering device comprises a superfine glass fiber gel-free filter cylinder, an opening for inserting a temperature thermocouple is formed in a space cylinder wall of an outlet of the superfine glass fiber gel-free filter cylinder, the temperature thermocouple is welded with the periphery of the opening in a sealing manner, and a porous partition plate is arranged in the space cylinder wall and used for supporting the tail part of the superfine glass fiber gel-free filter cylinder and isolating a space inside the filtering device for inserting the temperature thermocouple. Preferably, the diameter of the superfine glass fiber gel-free filter cylinder is 28mm, and the length of the superfine glass fiber gel-free filter cylinder is 70mm.
In one embodiment, the connection mode of the comparison branch sampling rod and the filter device is threaded connection, so that the filter device is convenient to detach and replace the filter element.
When the comparison device of the above embodiment is used, a filter element is installed in the filter device 3, and two bubble sampling bottles containing absorption liquid are placed on the bracket 11 and connected with a smoke sampling instrument. The air pump 9 is started, the temperature measurement control unit 7 detects the temperature of the flue gas through the temperature measurement thermocouple 4, when the temperature of the flue gas reaches a set temperature threshold value, the temperature measurement control unit 7 sends out a control signal, the electromagnetic angle valve 6 is started, then the smoke sampling instrument 8 is started, the smoke sampling instrument 8 stops after a period of time of operation, the electromagnetic angle valve 6 is closed, and the air pump 9 is closed. And after the sampling is finished, the sampling personnel records the sampling amount, and the bubble sampling bottle is retracted to perform assay analysis according to the relevant regulations.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (4)
1. The comparison device for the ammonia escape monitoring instrument is characterized by comprising a flue gas sampling rod, a comparison branch sampling rod, a filtering device, a temperature thermocouple, a three-way joint, an electromagnetic angle valve and a temperature measurement control unit, wherein the flue gas sampling rod is inserted into a flue, two outlets are formed in the part, exposed out of the flue, of the flue gas sampling rod, the ammonia escape monitoring instrument and the comparison branch sampling rod are respectively connected, an inlet of the filtering device is connected with the comparison branch sampling rod, an outlet of the filtering device is connected with an inlet of the three-way joint, a common outlet of the three-way joint is connected with a smoke sampling instrument, a free outlet of the three-way joint is connected with an air pump, and the electromagnetic angle valve is arranged between the free outlet and the air pump; one end of the temperature thermocouple is welded into the filter device in a sealing way and is used for measuring the temperature of the flue gas passing through the filter device; the temperature measurement control unit is in wireless connection with the temperature thermocouple, the electromagnetic angle valve and the smoke sampling instrument and is used for controlling the electromagnetic angle valve and the smoke sampling instrument to work according to the temperature measured by the temperature thermocouple; a bracket for stably placing a bubble absorption bottle is fixedly arranged near a free outlet of the three-way joint, the bubble absorption bottle is connected with a smoke dust sampling instrument, and a sample obtained from the bubble absorption bottle is detected by an assay analysis instrument.
2. The device for comparing ammonia escape monitoring instrument according to claim 1, wherein the filtering device comprises a superfine glass fiber gel-free filter cartridge, an opening for inserting a temperature thermocouple is arranged on a space cylinder wall of an outlet of the superfine glass fiber gel-free filter cartridge, the temperature thermocouple is welded with the periphery of the opening in a sealing manner, a porous partition plate is arranged in the space cylinder wall and used for supporting the tail part of the superfine glass fiber gel-free filter cartridge and isolating a space inside the filtering device for inserting the temperature thermocouple.
3. The comparison device for ammonia escape monitoring instruments according to claim 1, wherein the outer surface of the flue gas sampling rod is provided with a heat preservation sleeve capable of resisting 200 ℃.
4. The comparison device for ammonia slip monitoring meters according to claim 1, characterized by comprising the steps of:
s1, installing a filter element in a filter device, placing two bubble sampling bottles filled with absorption liquid on a bracket, and connecting the two bubble sampling bottles with a smoke sampling instrument;
s2, starting an air pump, detecting the temperature of the flue gas by a temperature measurement control unit through a temperature measurement thermocouple, sending a control signal by the temperature measurement control unit when the temperature of the flue gas reaches a set temperature threshold value, starting an electromagnetic angle valve, starting a smoke sampling instrument, stopping the smoke sampling instrument after running for a set period of time, and closing the electromagnetic angle valve;
s3, closing the air pump and recording the sampling amount;
and S4, after sampling is finished, the bubble sampling bottle is retracted, and assay analysis is carried out according to the relevant protocol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710900523.5A CN107632119B (en) | 2017-09-28 | 2017-09-28 | Comparison device for ammonia escape monitoring instrument and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710900523.5A CN107632119B (en) | 2017-09-28 | 2017-09-28 | Comparison device for ammonia escape monitoring instrument and application method thereof |
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| Publication Number | Publication Date |
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| CN107632119A CN107632119A (en) | 2018-01-26 |
| CN107632119B true CN107632119B (en) | 2024-04-12 |
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| CN107632119A (en) | 2018-01-26 |
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