CN111610296A - Sampling absorption measurement device and method for multi-point automatic switching of ammonia in flue gas - Google Patents
Sampling absorption measurement device and method for multi-point automatic switching of ammonia in flue gas Download PDFInfo
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- CN111610296A CN111610296A CN202010565934.5A CN202010565934A CN111610296A CN 111610296 A CN111610296 A CN 111610296A CN 202010565934 A CN202010565934 A CN 202010565934A CN 111610296 A CN111610296 A CN 111610296A
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- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0022—General constructional details of gas analysers, e.g. portable test equipment using a number of analysing channels
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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Abstract
The device comprises a sampling and absorbing unit, an absorbing liquid conveying unit, an absorbing liquid discharging unit, an ammonia analyzing unit and a data analyzing and controlling unit, wherein the data analyzing and controlling unit is used for analyzing the test result of the ammonia analyzing unit, controlling the sampling and absorbing unit to sample and stop sampling, controlling the absorbing liquid conveying unit and the absorbing liquid discharging unit to discharge absorbing liquid in the sampling and absorbing unit in sequence, and controlling the ammonia analyzing unit to analyze the ammonia concentration in the sampling and absorbing unit in sequence. According to the invention, the data analysis control unit controls the sampling time and the sampling sequence of different sampling pumps, so that the ammonia analyzer is controlled to analyze the concentration of the ammonia escaping from the absorption bottle in sequence, and thus, a set of ammonia analysis device can complete flexible differential processing of different measuring points, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of denitration ammonia escape measurement, in particular to a sampling absorption measurement device and method for multi-point automatic switching of ammonia in flue gas.
Background
In the flue gas denitration technology of the thermal power plant, along with the improvement of denitration efficiency, the risk of increasing the ammonia escape value is also improved. At present, single-point measurement is generally adopted for measuring the escape of the denitrified ammonia, namely, only one area in a flue is sampled, the representativeness is poor, and the ammonia escape distribution of the whole denitration outlet flue cannot be reflected, so that the ammonia escape measurement is needed to be carried out on different areas of the denitration outlet flue.
The significance of ammonia escape measurement is to ensure that the design value cannot be exceeded for a long time, the influence on the safe and stable operation of the system is avoided, and if an independent ammonia escape measurement device is arranged in each measurement area, the cost is high and the maintenance amount is large, so that the ammonia escape analysis system capable of realizing multi-point sampling analysis is invented, the automatic switching of the sequence among different sampling points can be realized, and the significance is achieved.
Disclosure of Invention
The invention aims to provide a sampling absorption measurement device and a sampling absorption measurement method for multi-point automatic switching of ammonia in flue gas, and aims to realize sequential sampling analysis of different measuring points by adopting a set of ammonia analyzer and realize automatic switching, so that the requirement of measuring ammonia escape at a denitration outlet can be met, and the cost is reduced.
Therefore, the invention provides a sampling absorption measuring device for automatically switching ammonia in flue gas at multiple points, which comprises:
the sampling and absorbing units are at least two in number and correspond to NOx measuring points of the denitration outlet flue one by one, the sampling and absorbing units are communicated with an external absorbing liquid supply unit, and the sampling and absorbing units are used for collecting and absorbing ammonia escaping from the flue gas;
the absorption liquid conveying units are respectively communicated with the sampling and absorption units and are used for conveying the absorption liquid in the sampling and absorption units;
the absorption liquid discharge unit is communicated with the absorption liquid conveying unit and is used for discharging the absorption liquid in the sampling and absorption unit;
the ammonia analysis units are respectively communicated with the sampling and absorption units and are used for detecting the ammonia concentration in the sampling and absorption units;
and the data analysis control unit is respectively connected with the sampling and absorbing unit, the absorption liquid conveying unit, the absorption liquid discharging unit and the ammonia analysis unit and is used for analyzing the test result of the ammonia analysis unit, controlling the sampling and absorbing unit to sample and stop sampling, controlling the absorption liquid conveying unit and the absorption liquid discharging unit to discharge the absorption liquid in the sampling and absorbing unit in sequence and controlling the ammonia analysis unit to analyze the ammonia concentration in the sampling and absorbing unit in sequence.
Preferably, each sampling and absorption unit comprises:
the sampling probe is arranged in the denitration outlet flue and comprises a first sampling probe, a second sampling probe, a third sampling probe … … and an nth sampling probe which are respectively in one-to-one correspondence with NOx measuring points in the denitration outlet flue;
the absorption bottle is arranged outside the denitration outlet flue, is communicated with an external absorption liquid supply unit, and comprises a first absorption bottle, a second absorption bottle, a third absorption bottle … … and an nth absorption bottle which are respectively in one-to-one correspondence with the first sampling probe, the second sampling probe, the third sampling probe … … and the nth sampling probe;
the sampling pump comprises a first sampling pump, a second sampling pump, a third sampling pump … … and an nth sampling pump which are correspondingly connected with the first absorption bottle, the second absorption bottle, the third absorption bottle … … and the nth absorption bottle respectively.
Preferably, the absorption liquid transfer unit includes an absorption liquid transfer pump connected to the first absorption bottle, the second absorption bottle, the third absorption bottle … …, and the nth absorption bottle, respectively, and further includes a first switching valve, a second switching valve, a third switching valve … …, and an nth switching valve provided on the pipelines between the first absorption bottle, the second absorption bottle, the third absorption bottle … …, and the nth absorption bottle and the absorption liquid transfer pump.
Preferably, the absorption liquid discharge unit includes a waste liquid tank connected to the absorption liquid feed pump, and further includes a waste liquid tank isolation valve provided on a pipe between the waste liquid tank and the absorption liquid feed pump.
Preferably, the ammonia analysis unit comprises an ammonia analyzer connected with the absorption liquid delivery pump, and further comprises an isolation valve to the ammonia analyzer, which is arranged on a pipeline between the ammonia analyzer and the absorption liquid delivery pump.
Preferably, the data analysis control unit is connected to the first sampling pump, the second sampling pump, the third sampling pump … … nth sampling pump, the first switching valve, the second switching valve, the third switching valve … … nth switching valve, the absorption liquid delivery pump, the to-waste liquid tank isolation valve, the to-ammonia analyzer isolation valve, and the ammonia analyzer, respectively.
Preferably, n is any integer between 2 and 30.
In addition, the invention also provides a method of the sampling absorption measurement device for automatically switching ammonia in flue gas at multiple points, which specifically comprises the following steps:
s1, setting the sampling time and the ammonia analysis sequence of the sampling and absorbing units by the data analysis control unit, wherein the ammonia analysis sequence is the nth sampling and absorbing unit of the first sampling and absorbing unit, the second sampling and absorbing unit and the third sampling and absorbing unit … …, controlling to start each sampling and absorbing unit to start sampling, automatically stopping sampling when the sampling time of each sampling and absorbing unit is up, and waiting for the sampling of the ammonia analyzer;
s2, stopping sampling by a certain sampling and absorbing unit when the sampling time of the sampling and absorbing unit in the analysis sequence is up, starting an absorbing liquid conveying unit, starting an ammonia analysis unit, and starting the sampling by the ammonia analysis unit;
s3, when the sampling time of the ammonia analysis unit is up, closing the ammonia analysis unit, opening the absorption liquid discharge unit, and discharging the residual absorption liquid in the sampling and absorption unit;
s4, closing the absorption liquid discharging unit, stopping the absorption liquid conveying unit, conveying new absorption liquid into the sampling and absorption unit by the external absorption liquid supply unit, and starting the sampling and absorption unit to start sampling;
s5, next sampling in the analysis order and sampling time of the absorption unit, and repeating the steps S2-S4.
Preferably, the specific operations of the steps S2-S5 are:
step one, when the sampling time of a first sampling pump is up, closing the first sampling pump, starting an absorption liquid delivery pump, opening a first switching valve and an isolation valve of an ammonia analyzer, and starting sampling by the ammonia analyzer;
step two, after sampling of the ammonia analyzer is completed, opening an isolation valve of a waste liquid tank, closing the isolation valve of the ammonia analyzer, and discharging the absorption liquid in the first absorption bottle to the waste liquid tank;
step three, after the discharge is finished, closing the isolating valve of the waste liquid tank, stopping the absorption liquid conveying pump, closing the first switching valve, starting the first sampling pump, and supplying new absorption liquid into the first absorption bottle by the external absorption liquid supply unit;
step four, when the sampling time of the second sampling pump is up, closing the second sampling pump, starting the absorption liquid delivery pump, opening the second switching valve and the isolation valve of the ammonia analyzer, and starting sampling by the ammonia analyzer;
fifthly, after sampling of the ammonia analyzer is completed, opening an isolation valve of the waste liquid tank, closing the isolation valve of the ammonia analyzer, and discharging the absorption liquid in the second absorption bottle to the waste liquid tank;
step six, after the discharge is finished, closing the isolating valve of the waste liquid tank, stopping the absorption liquid conveying pump, closing the second switching valve, starting the second sampling pump, and supplying new absorption liquid into the second absorption bottle by the external absorption liquid supply unit;
step seven, when the sampling time of the third sampling pump is up, closing the third sampling pump, starting the absorption liquid delivery pump, opening the third switching valve and the isolation valve of the ammonia analyzer, and starting the sampling of the ammonia analyzer;
step eight, after sampling of the ammonia analyzer is completed, opening an isolation valve of the waste liquid tank, closing the isolation valve of the ammonia analyzer, and discharging the absorption liquid in the third absorption bottle to the waste liquid tank;
step nine, after the discharge is finished, closing the isolating valve of the waste liquid tank, stopping the absorption liquid conveying pump, closing the third switching valve, starting the third sampling pump, and supplying new absorption liquid into the third absorption bottle by the external absorption liquid supply unit;
and step ten, repeating the step one to the step nine.
Compared with the prior art, the invention has the characteristics and beneficial effects that: the invention respectively arranges a sampling and absorbing unit at different NOx measuring points of a flue, and a plurality of sampling and absorbing units share a set of absorbing liquid conveying unit, a set of absorbing liquid discharging unit and a set of ammonia analyzing unit. The sampling time and the sampling sequence of different sampling pumps are controlled by the data analysis control unit, so that the ammonia analyzer is controlled to analyze the concentration of the ammonia escaping from the absorption bottle in sequence, and thus, one set of ammonia analysis device can complete flexible differential processing of different measuring points, and the cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a sampling absorption measurement device with multi-point automatic switching of ammonia in flue gas.
The attached drawings are marked as follows: 11-a first sampling probe, 12-a second sampling probe, 13-a third sampling probe, 21-a first absorption bottle, 22-a second absorption bottle, 23-a third absorption bottle, 31-a first sampling pump, 32-a second sampling pump, 33-a third sampling pump, 4-a denitration outlet flue, a 5-absorption liquid delivery pump, 61-a first switching valve, 62-a second switching valve, 63-a third switching valve, 71-a waste liquid tank, 72-a waste liquid tank isolating valve, 81-an ammonia analyzer, 82-an ammonia analyzer isolating valve and 9-a data analysis control unit.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a sampling absorption measuring device for multi-point automatic switching of ammonia in flue gas includes a sampling and absorption unit, an absorption liquid conveying unit, an absorption liquid discharging unit, an ammonia analysis unit, and a data analysis control unit 9. The number of the sampling and absorbing units is at least two and is in one-to-one correspondence with NOx measuring points of the denitration outlet flue 4, the sampling and absorbing units are communicated with an external absorbing liquid supply unit, and the sampling and absorbing units are used for collecting and absorbing ammonia escaping from flue gas. The absorption liquid conveying unit is one in number, is respectively communicated with the sampling and absorption unit and is used for conveying the absorption liquid in the sampling and absorption unit. The absorption liquid discharge unit is communicated with the absorption liquid conveying unit and is used for discharging the absorption liquid in the sampling and absorption unit. The number of the ammonia analysis units is one, and the ammonia analysis units are respectively communicated with the sampling and absorption units and used for detecting the ammonia concentration in the sampling and absorption units. The data analysis control unit 9 is connected to the sampling and absorption unit, the absorption liquid delivery unit, the absorption liquid discharge unit, and the ammonia analysis unit, respectively, and is configured to analyze a test result of the ammonia analysis unit, control the sampling and absorption unit to sample and stop sampling, control the absorption liquid delivery unit and the absorption liquid discharge unit to discharge absorption liquid in the sampling and absorption unit in sequence, and control the ammonia analysis unit to analyze ammonia concentration in the sampling and absorption unit in sequence.
Each sampling and absorption unit comprises a sampling probe, an absorption bottle and a sampling pump. The sampling probe is arranged in the denitration outlet flue 4 and comprises a first sampling probe 11, a second sampling probe 12, a third sampling probe 13 … … and an nth sampling probe which are respectively in one-to-one correspondence with NOx measuring points in the denitration outlet flue 4. n is any integer between 2 and 30. The absorption bottle is arranged outside the denitration outlet flue 4, is communicated with an external absorption liquid supply unit, and comprises a first absorption bottle 21, a second absorption bottle 22, a third absorption bottle 23 … … and an nth absorption bottle which are respectively in one-to-one correspondence with the first sampling probe 11, the second sampling probe 12, the third sampling probe 13 … … and the nth sampling probe. The sampling pump includes a first sampling pump 31, a second sampling pump 32, a third sampling pump 33 … …, and an nth sampling pump respectively connected to the first absorption bottle 21, the second absorption bottle 22, the third absorption bottle 23 … …, and the nth absorption bottle.
The absorption liquid delivery unit includes an absorption liquid delivery pump 5, and the absorption liquid delivery pump 5 is connected to the first absorption bottle 21, the second absorption bottle 22, the third absorption bottle 23 … …, and the nth absorption bottle, respectively. The absorption liquid transfer unit further includes a first switching valve 61, a second switching valve 62, a third switching valve 63 … …, and an nth switching valve provided on the pipelines between the first absorption bottle 21, the second absorption bottle 22, the third absorption bottle 23 … …, and the nth absorption bottle and the absorption liquid transfer pump 5. The first switching valve 61, the second switching valve 62, the third switching valve 63 … …, and the nth switching valve may be solenoid valves or other valves that may be used for isolation.
The absorption liquid discharge unit includes a waste liquid tank 71 connected to the absorption liquid feed pump 5, and further includes a waste liquid tank isolation valve 72 provided on a pipe between the waste liquid tank 71 and the absorption liquid feed pump 5.
The ammonia analysis unit includes an ammonia analyzer 81 connected to the absorption liquid feed pump 5, and further includes an to-ammonia analyzer isolation valve 82 provided on a pipe between the ammonia analyzer 81 and the absorption liquid feed pump 5.
The data analysis control unit 9 is connected to the first sampling pump 31, the second sampling pump 32, the third sampling pump 33 … …, the nth sampling pump, the first switching valve 61, the second switching valve 62, the third switching valve 63 … …, the nth switching valve, the absorbing liquid transfer pump 5, the waste liquid tank isolation valve 72, the ammonia analyzer isolation valve 82, and the ammonia analyzer 81, respectively. The to waste tank isolation valve 72 and to ammonia analyzer isolation valve 82 may be solenoid valves or other valves that may be used for isolation.
The data analysis control unit 9 includes a data analysis unit and a switching control unit, the ammonia analyzer 81 transmits data to the data analysis unit, the data analysis unit outputs instructions to the switching control unit, and then controls the switching of the first switching valve 61, the second switching valve 62, the third switching valve 63 … …, the nth switching valve, the waste liquid tank isolation valve 72, and the ammonia analyzer isolation valve 82, and controls the opening or closing of the first sampling pump 31, the second sampling pump 32, the third sampling pump 33 … …, the nth sampling pump, and the absorption liquid delivery pump 5. The switching control unit controls the analysis sequence and the sampling time of the absorption liquid in each sampling and absorption unit, and controls the opening and closing of the nth sampling pump and the absorption liquid delivery pump 5 of the first sampling pump 31, the second sampling pump 32, the third sampling pump 33 … …. The switching control unit can independently control a certain sampling pump to hang up, so that the sampling device at a certain measuring point is stopped without influencing the operation of other sampling devices at the measuring point.
Since the ammonia analyzer 81 has a certain detection range, the sampling time is related to the concentration of the ammonia escaping from the upper cycle. The lower the concentration of the escaped ammonia in the upper period is, the longer the sampling time in the period is, so that the detected concentration is in the range of the ammonia analyzer 81, and the detection accuracy is ensured. The length of the sampling time in the present invention is preferably determined by the concentration of the escaped ammonia in the first 5-10 cycles.
The method for the sampling absorption measurement device for automatically switching ammonia in the flue gas at multiple points specifically comprises the following steps:
s1, the data analysis control unit 9 sets the sampling time and the ammonia analysis sequence of the sampling and absorption units, the ammonia analysis sequence is the first sampling and absorption unit, the second sampling and absorption unit and the third sampling and absorption unit … … th sampling and absorption unit, the sampling of the sampling and absorption units is started under control, the sampling is automatically stopped when the sampling time of the sampling and absorption units is up, and the ammonia analyzer 81 is waited for sampling.
And S2, stopping sampling by the sampling and absorption unit when the sampling time of a certain sampling and absorption unit in the analysis sequence is up, starting the absorption liquid conveying unit, starting the ammonia analysis unit, and starting sampling by the ammonia analysis unit.
And S3, when the sampling time of the ammonia analysis unit is up, closing the ammonia analysis unit, opening the absorption liquid discharge unit, and discharging the residual absorption liquid in the sampling and absorption unit.
S4, closing the absorption liquid discharge unit, stopping the absorption liquid supply unit, feeding new absorption liquid into the sampling and absorption unit by the external absorption liquid supply unit, and starting the sampling and absorption unit to start sampling.
S5, next sampling in the analysis order and sampling time of the absorption unit, and repeating the steps S2-S4.
The specific operations of steps S2-S5 are:
step one, when the sampling time of the first sampling pump 31 is up, the first sampling pump 31 is closed, the absorption liquid delivery pump 5 is opened, the first switching valve 61 and the ammonia analyzer isolation valve 82 are opened, and the ammonia analyzer 81 starts sampling.
And step two, after the sampling of the ammonia analyzer 81 is completed, opening the waste liquid tank isolation valve 72, closing the ammonia analyzer isolation valve 82, and discharging the absorption liquid in the first absorption bottle 21 to the waste liquid tank 71.
And step three, after the discharge is finished, closing the waste liquid tank isolating valve 72, stopping the absorption liquid conveying pump 5, closing the first switching valve 61, starting the first sampling pump 31, and supplying new absorption liquid into the first absorption bottle 21 by the external absorption liquid supply unit.
And step four, when the sampling time of the second sampling pump 32 is up, closing the second sampling pump 32, opening the absorption liquid delivery pump 5, opening the second switching valve 62 and the ammonia analyzer isolation valve 82, and starting sampling by the ammonia analyzer 81.
And step five, after the sampling of the ammonia analyzer 81 is completed, opening the waste liquid tank isolation valve 72, closing the ammonia analyzer isolation valve 82, and discharging the absorption liquid in the second absorption bottle 22 to the waste liquid tank 71.
And step six, after the discharge is finished, closing the waste liquid tank isolating valve 72, stopping the absorption liquid conveying pump 5, closing the second switching valve 62, starting the second sampling pump 32, and supplying new absorption liquid into the second absorption bottle 22 by the external absorption liquid supply unit.
And step seven, when the sampling time of the third sampling pump 33 is up, closing the third sampling pump 33, opening the absorption liquid delivery pump 5, opening the third switching valve 63 and the ammonia analyzer isolation valve 82, and starting sampling by the ammonia analyzer 81.
And step eight, after the sampling of the ammonia analyzer 81 is completed, opening the waste liquid tank isolation valve 72, closing the ammonia analyzer isolation valve 82, and discharging the absorption liquid in the third absorption bottle 23 to the waste liquid tank 71.
And step nine, after the discharge is finished, closing the waste liquid tank isolating valve 72, stopping the absorption liquid conveying pump 5, closing the third switching valve 63, starting the third sampling pump 33, and supplying new absorption liquid into the third absorption bottle 23 by the external absorption liquid supply unit.
And step ten, repeating the step one to the step nine.
Specifically, taking a certain project as an example, n is 3, and the sampling sequence of each sampling pump is a first sampling pump, a second sampling pump and a third sampling pump. The sampling time of the sampling and absorbing unit is 0.5min-80 min. The sampling time of the first sampling pump 31 is 18min, and the sampling time of the ammonia analyzer 81 corresponding to this cycle is 1 min. The sampling time of the second sampling pump 32 is 20min, and the sampling time of the ammonia analyzer 81 corresponding to this cycle is 3 min. The sampling time of the third sampling pump 33 is 22min, and the sampling time of the ammonia analyzer 81 corresponding to this cycle is 3 min. The time for each absorption bottle to discharge the absorption liquid to the waste liquid tank 71 is 2 min.
The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (9)
1. A sampling absorption measuring device for automatically switching ammonia in flue gas at multiple points is characterized by comprising:
the sampling and absorbing units are at least two in number and correspond to NOx measuring points of the denitration outlet flue (4) one by one, the sampling and absorbing units are communicated with an external absorbing liquid supply unit, and the sampling and absorbing units are used for collecting and absorbing ammonia escaping from flue gas;
the absorption liquid conveying units are respectively communicated with the sampling and absorption units and are used for conveying the absorption liquid in the sampling and absorption units;
the absorption liquid discharge unit is communicated with the absorption liquid conveying unit and is used for discharging the absorption liquid in the sampling and absorption unit;
the ammonia analysis units are respectively communicated with the sampling and absorption units and are used for detecting the ammonia concentration in the sampling and absorption units;
and the data analysis control unit (9) is respectively connected with the sampling and absorbing unit, the absorbing liquid conveying unit, the absorbing liquid discharging unit and the ammonia analysis unit and is used for analyzing the test result of the ammonia analysis unit, controlling the sampling and absorbing unit to sample and stop sampling, controlling the absorbing liquid conveying unit and the absorbing liquid discharging unit to discharge the absorbing liquid in the sampling and absorbing unit in sequence and controlling the ammonia analysis unit to analyze the ammonia concentration in the sampling and absorbing unit in sequence.
2. The sampling absorption measurement device for the automatic multipoint switching of ammonia in flue gas according to claim 1, characterized in that each sampling and absorption unit comprises:
the sampling probe is arranged in the denitration outlet flue (4) and comprises a first sampling probe (11), a second sampling probe (12), a third sampling probe (13) … … and an nth sampling probe which are respectively in one-to-one correspondence with NOx measuring points in the denitration outlet flue (4);
the absorption bottle is arranged outside the denitration outlet flue (4), is communicated with an external absorption liquid supply unit, and comprises a first absorption bottle (21), a second absorption bottle (22), a third absorption bottle (23), a … … and an nth absorption bottle which are respectively in one-to-one correspondence with the first sampling probe (11), the second sampling probe (12), the third sampling probe (13), … … and the nth sampling probe;
the sampling pump comprises a first sampling pump (31), a second sampling pump (32), a third sampling pump (33) … … and an nth sampling pump which are correspondingly connected with a first absorption bottle (21), a second absorption bottle (22), a third absorption bottle (23) … … and the nth absorption bottle respectively.
3. The sampling absorption measuring device according to claim 2, wherein the absorption liquid conveying unit comprises an absorption liquid conveying pump (5), the absorption liquid conveying pump (5) is respectively connected with the first absorption bottle (21), the second absorption bottle (22), the third absorption bottle (23) … … and the nth absorption bottle, and the absorption liquid conveying unit further comprises a first switching valve (61), a second switching valve (62), a third switching valve (63) … … and an nth switching valve which are arranged on pipelines between the first absorption bottle (21), the second absorption bottle (22), the third absorption bottle (23) … … and the nth absorption bottle and the absorption liquid conveying pump (5).
4. The sampling absorption measurement device for multi-point automatic switching of ammonia in flue gas according to claim 3, characterized in that: the absorption liquid discharge unit comprises a waste liquid tank (71) connected with the absorption liquid conveying pump (5), and further comprises a waste liquid tank isolating valve (72) arranged on a pipeline between the waste liquid tank (71) and the absorption liquid conveying pump (5).
5. The sampling absorption measurement device for multi-point automatic switching of ammonia in flue gas according to claim 4, characterized in that: the ammonia analysis unit comprises an ammonia analyzer (81) connected with the absorption liquid delivery pump (5), and further comprises an ammonia analyzer isolation valve (82) arranged on a pipeline between the ammonia analyzer (81) and the absorption liquid delivery pump (5).
6. The sampling absorption measurement device for multi-point automatic switching of ammonia in flue gas according to claim 5, characterized in that: the data analysis control unit (9) is connected with a first sampling pump (31), a second sampling pump (32), a third sampling pump (33), an nth sampling pump (… …), a first switching valve (61), a second switching valve (62), a third switching valve (63), a … … nth switching valve, an absorption liquid delivery pump (5), a waste liquid tank isolating valve (72), an ammonia analyzer isolating valve (82) and an ammonia analyzer (81) respectively.
7. The sampling absorption measurement device for the automatic multi-point switching of ammonia in flue gas according to any one of claims 2 to 6, characterized in that: and n is any integer between 2 and 30.
8. The method for the sampling absorption measurement device for the automatic multi-point switching of the ammonia in the flue gas as claimed in claim 7 is characterized by comprising the following steps:
s1, the data analysis control unit (9) sets the sampling time and the ammonia analysis sequence of the sampling and absorption units, the ammonia analysis sequence is the first sampling and absorption unit, the second sampling and absorption unit and the third sampling and absorption unit … … th sampling and absorption unit, the sampling and absorption units are controlled to start to sample, the sampling is automatically stopped when the sampling time of the sampling and absorption units is up, and the ammonia analyzer (81) is waited to sample;
s2, stopping sampling by a certain sampling and absorbing unit when the sampling time of the sampling and absorbing unit in the analysis sequence is up, starting an absorbing liquid conveying unit, starting an ammonia analysis unit, and starting the sampling by the ammonia analysis unit;
s3, when the sampling time of the ammonia analysis unit is up, closing the ammonia analysis unit, opening the absorption liquid discharge unit, and discharging the residual absorption liquid in the sampling and absorption unit;
s4, closing the absorption liquid discharging unit, stopping the absorption liquid conveying unit, conveying new absorption liquid into the sampling and absorption unit by the external absorption liquid supply unit, and starting the sampling and absorption unit to start sampling;
s5, next sampling in the analysis order and sampling time of the absorption unit, and repeating the steps S2-S4.
9. The method for sampling absorption measurement device of ammonia in flue gas with multi-point automatic switching according to claim 8, characterized in that the specific operations of the steps S2-S5 are as follows:
step one, when the sampling time of the first sampling pump (31) is up, closing the first sampling pump (31), starting the absorption liquid conveying pump (5), opening the first switching valve (61) and the isolating valve (82) of the ammonia analyzer, and starting sampling by the ammonia analyzer (81);
step two, after sampling by the ammonia analyzer (81), opening a waste liquid tank isolation valve (72), closing an ammonia analyzer isolation valve (82), and discharging the absorption liquid in the first absorption bottle (21) to a waste liquid tank (71);
step three, after the discharge is finished, closing the isolating valve (72) of the waste liquid tank, stopping the absorption liquid conveying pump (5), closing the first switching valve (61), starting the first sampling pump (31), and supplying new absorption liquid into the first absorption bottle (21) by the external absorption liquid supply unit;
step four, when the sampling time of the second sampling pump (32) is up, the second sampling pump (32) is closed, the absorption liquid conveying pump (5) is started, the second switching valve (62) and the isolating valve (82) of the ammonia analyzer are opened, and the ammonia analyzer (81) starts to sample;
fifthly, after sampling by the ammonia analyzer (81), opening an isolation valve (72) of the waste liquid tank, closing an isolation valve (82) of the ammonia analyzer, and discharging the absorption liquid in the second absorption bottle (22) to the waste liquid tank (71);
step six, after the discharge is finished, closing the isolating valve (72) of the waste liquid tank, stopping the absorption liquid conveying pump (5), closing the second switching valve (62), starting the second sampling pump (32), and supplying new absorption liquid into the second absorption bottle (22) by the external absorption liquid supply unit;
step seven, when the sampling time of the third sampling pump (33) is up, closing the third sampling pump (33), starting the absorption liquid conveying pump (5), opening the third switching valve (63) and the isolating valve (82) of the ammonia analyzer, and starting sampling by the ammonia analyzer (81);
step eight, after sampling by the ammonia analyzer (81), opening a waste liquid tank isolation valve (72), closing an ammonia analyzer isolation valve (82), and discharging the absorption liquid in the third absorption bottle (23) to a waste liquid tank (71);
step nine, after the discharge is finished, closing the isolating valve (72) of the waste liquid tank, stopping the absorption liquid conveying pump (5), closing the third switching valve (63), starting the third sampling pump (33), and supplying new absorption liquid into the third absorption bottle (23) by the external absorption liquid supply unit;
and step ten, repeating the step one to the step nine.
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