CN113203827B - NO is measured in multichannel sampling mixing stirring x Method and apparatus of (a) - Google Patents
NO is measured in multichannel sampling mixing stirring x Method and apparatus of (a) Download PDFInfo
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- CN113203827B CN113203827B CN202010139959.9A CN202010139959A CN113203827B CN 113203827 B CN113203827 B CN 113203827B CN 202010139959 A CN202010139959 A CN 202010139959A CN 113203827 B CN113203827 B CN 113203827B
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- 238000003756 stirring Methods 0.000 title claims abstract description 93
- 238000002156 mixing Methods 0.000 title claims abstract description 31
- 238000005070 sampling Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 19
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000003546 flue gas Substances 0.000 claims abstract description 47
- 230000005540 biological transmission Effects 0.000 claims abstract description 36
- 239000000779 smoke Substances 0.000 claims abstract description 31
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims description 27
- 238000013019 agitation Methods 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N33/0073—Control unit therefor
- G01N33/0075—Control unit therefor for multiple spatially distributed sensors, e.g. for environmental monitoring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N33/0011—Sample conditioning
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a method and a device for measuring NOx by multi-path sampling, mixing and stirring, wherein the method comprises the following steps of S1, arranging an acquisition unit between a sampling point and a stirring unit, and establishing connection between a control unit and the acquisition unit as well as between the stirring unit and a measuring unit; the method comprises the steps that transmission data of flue gas when the flue gas is transmitted through an acquisition unit are acquired through a control unit; controlling the start and stop of the stirring unit according to the transmission data acquired by the control unit; the flue gas passing through the stirring unit enters the measuring unit, and the entering flue gas is detected by the measuring unit, so that the NOx content in the flue gas is obtained; one end of the acquisition unit is communicated with the smoke sampling point; the stirring unit is communicated with the other end of the acquisition unit; the control unit is respectively connected with the acquisition unit and the stirring unit; the measuring unit is connected with the control unit. The method and the device for measuring the NOx by multi-path sampling mixing stirring have simpler overall structure, and can reduce the cost and simultaneously lead the measurement result to be more accurate.
Description
Technical Field
The invention relates to the field of thermal power generation, in particular to a method and a device for measuring NOx by multi-way sampling, mixing and stirring.
Background
The China is a large country of energy utilization, the world of the use amount of electric power is ranked first, the thermal power generation occupies more than 80% of the total power generation of China, the flue gas emission cleanliness of the thermal power plant is related to the health of the living environment of people, and the thermal power plant is also an object for important monitoring in the thermal power generation field.
Ammonia spraying denitration is an important link of flue gas treatment of a thermal power plant, and whether the NOx content of the flue gas influences the rationality and economical efficiency of ammonia spraying (urea spraying) can be accurately monitored, so that the NOx content of the flue gas discharged into the atmosphere is influenced, and a plurality of problems such as resource waste and the like are caused.
The multi-measuring point sampling device in the prior art solves the problem of inaccurate concentration of NOx by adding measuring equipment, and the specific steps are as follows: firstly, adding sampling measuring points and measuring equipment; step two, collecting NOx concentration data of each measuring device; thirdly, taking the average value as a concentration value of NOx in the flue gas; however, the multi-site sampling device has the following defects: 1. equipment investment is large, and equipment cost is increased; 2. the workload of detection personnel and maintenance is increased, and the labor cost is increased; 3. the average value fluctuates greatly due to the sensitivity difference of the device.
Disclosure of Invention
The invention provides a method and a device for measuring NOx by multi-path sampling, mixing and stirring, which solve the problems in the prior art.
The technical scheme of the invention is realized as follows:
a method for measuring NOx by multi-sample mixing and stirring, comprising the steps of:
s1, arranging an acquisition unit between a sampling point and a stirring unit, and establishing connection among a control unit, the acquisition unit, the stirring unit and a measurement unit;
s2, acquiring transmission data of the flue gas when the flue gas is transmitted through the acquisition unit through the control unit;
s3, controlling the start and stop of the stirring unit according to the transmission data acquired by the control unit;
s4, the flue gas passing through the stirring unit enters the measuring unit, and the entering flue gas is detected through the measuring unit, so that the NOx content in the flue gas is obtained.
As a further technical scheme, the step S1 is as follows: and arranging a plurality of acquisition pipelines provided with detection devices between the sampling points and the stirring units, and establishing connection between the control unit and the detection devices, the stirring units and the measurement units on the acquisition pipelines.
As a further technical scheme, the step S2 is as follows: and acquiring data acquired by the detection device when the flue gas passes through the plurality of acquisition pipelines through the control unit.
As a further technical scheme, the step S3 is as follows: the control unit controls the start and stop of the stirring unit according to the data acquired by the detection device.
The present invention also provides an apparatus for measuring NOx using a multi-sampling mixing agitation method, comprising:
the acquisition unit is used for acquiring and transmitting the smoke, acquiring a smoke transmission state, and communicating one end of the smoke transmission state with a smoke sampling point;
the stirring unit is used for temporarily storing the flue gas transmitted in the acquisition unit and is communicated with the other end of the acquisition unit;
the control unit is used for acquiring the flue gas transmission data of the acquisition unit, controlling the stirring unit to start and stop, and being respectively connected with the acquisition unit and the stirring unit;
and the measuring unit is used for detecting the flue gas passing through the stirring unit, feeding back the detection result to the control unit and connecting with the control unit.
As a further technical solution, the acquisition unit comprises:
the collecting pipelines are arranged between the sampling points and the stirring unit;
and the detection devices are respectively arranged on the acquisition pipeline.
Preferably, the detection device is a smoke sensor.
As a further technical solution, the stirring unit includes:
the mixing box body is communicated with one end of the acquisition unit;
the stirring blade is arranged in the mixing box body;
and the output shaft of the stirring motor penetrates through the mixing box body and then is connected with the stirring blade, and the stirring motor is connected with the control unit.
As a further technical solution, the control unit includes:
a console arranged at a use place;
the control device is arranged in the control console and is respectively connected with the acquisition unit, the stirring unit and the measuring unit.
As a further technical solution, the measurement unit includes:
one end of the measuring pipeline is communicated with the stirring unit;
and the measuring device is arranged on the measuring pipeline and is connected with the control unit.
According to the technical scheme, the data of the acquisition unit are acquired under the control of the control unit, whether the smoke passes through single-channel transmission or multiple-channel transmission is judged, and then the starting and stopping of the stirring unit are controlled according to the judging result; the equipment investment is reduced, and the measurement is performed in the advance, so that the investment of detection personnel can be reduced, and the workload of maintenance is reduced; in addition, the simultaneous measurement is realized after the concentrated mixing of multiple paths, and the measurement result is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for measuring NOx by multi-way sampling, mixing and stirring according to the present invention;
FIG. 2 is a block diagram of a device for measuring NOx by multi-way sampling, mixing and stirring according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the invention provides a method for measuring NOx by multi-way sampling, mixing and stirring, which comprises the following steps:
arranging an acquisition unit between the sampling point and the stirring unit, and establishing connection among the control unit, the acquisition unit, the stirring unit and the measurement unit; specifically, a plurality of acquisition pipelines provided with detection devices are arranged between sampling points and stirring units, and a control unit is connected with the detection devices, the stirring units and the measurement units on the acquisition pipelines; namely, each acquisition point is required to be connected with an acquisition pipeline aiming at different acquisition points, and the flue gas is transmitted through the acquisition pipelines; a detection device is arranged in each acquisition pipeline, so that when the flue gas transmission conditions are different, the acquired data are different; namely, the acquired data is divided into single acquisition pipeline transmission or multiple acquisition pipeline transmission;
the method comprises the steps that transmission data of flue gas when the flue gas is transmitted through an acquisition unit are acquired through a control unit; specifically, the control unit is used for acquiring data acquired by the detection device when the flue gas passes through the plurality of acquisition pipelines; the acquired data are different according to different states, namely single pipeline transmission smoke or multiple pipeline transmission smoke can be acquired;
controlling the start and stop of the stirring unit according to the transmission data acquired by the control unit; specifically, the control unit controls the start and stop of the stirring unit according to the data acquired by the detection device; of course, in the present invention, the state of the stirring unit is switched by the control unit according to the difference of the transmission data acquired by the situation; namely, when a single collecting pipeline transmits smoke, the stirring unit does not work, the smoke directly passes through the stirring unit, and when a plurality of collecting pipelines transmit, the stirring unit acts through the control unit; the flue gas entering the stirring unit is stirred, so that the flue gas is more uniform after being stirred;
the flue gas passing through the stirring unit enters the measuring unit, and the entering flue gas is detected by the measuring unit, so that the NOx content in the flue gas is obtained; when the flue gas is transmitted through a single collecting pipeline, the NOx content of the flue gas transmitted through the single pipeline is directly measured through the measuring unit, and when the flue gas is transmitted through a plurality of collecting pipelines, after the flue gas is stirred by the stirring unit, the NOx content after stirring is measured through the measuring unit.
As shown in fig. 2, the present invention also provides an apparatus for measuring NOx using a multi-sampling mixing agitation method, comprising:
one end of the acquisition unit 1 is communicated with the smoke sampling point, and the acquisition and the transmission of the smoke are carried out through the acquisition unit 1, and the smoke transmission state is obtained; the stirring unit 2 is communicated with the other end of the acquisition unit 1, and is used for temporarily storing the flue gas transmitted in the acquisition unit 1 through the stirring unit 2; the control unit 3 is respectively connected with the acquisition unit 1 and the stirring unit 2; the control unit 3 acquires the flue gas transmission data of the acquisition unit 1 and controls the stirring unit 2 to start and stop; the measuring unit 4 is connected with the control unit 3; the flue gas passing through the stirring unit 2 is detected through the measuring unit 4, and the detection result is fed back to the control unit 3;
wherein,,
the acquisition unit 1 comprises a plurality of acquisition pipelines and a plurality of detection devices, wherein the acquisition pipelines are arranged between the sampling points and the stirring unit 2; the detection devices are respectively arranged on the acquisition pipeline; in the invention, preferably, the detection device is a smoke sensor, and the transmission condition of the smoke in the acquisition pipeline is acquired through the smoke sensor; the use conditions of the acquisition pipelines are different according to different states, in the actual use process, the transmission can be carried out through a single acquisition pipeline, the transmission can also be carried out through a plurality of acquisition pipelines, and the signals fed back by the detection device are different according to the different transmission conditions; that is, the transmission data acquired by the control unit 3 are also different; the control unit 3 controls the stirring unit 2 differently according to different transmission data;
specifically, when single pipeline transmission is adopted, the control unit 3 does not control the stirring unit 2 to act after acquiring transmission data, and when a plurality of pipelines are adopted for transmission, the control unit 3 controls the stirring unit 2 to act after acquiring transmission data, so that the flue gas entering the stirring unit 2 is stirred, and the entering flue gas is more uniform; further, the accuracy of the measurement result is improved in the subsequent measurement process of the measurement unit 4; and, in addition, the method comprises the steps of,
the control unit 3 includes a console and a control device, the console being provided at a use place; the control device is arranged in the control console and is respectively connected with the acquisition unit 1, the stirring unit 2 and the measuring unit 4; the control console performs corresponding operation, receives data and sends control signals through the control device, and the control device is preferably a circuit board arranged in the control console;
in addition, the stirring unit 2 includes a mixing box body, a stirring blade, and a stirring motor, the mixing box body being communicated with one end of the collecting unit 1; the stirring blade is arranged in the mixing box body; the output shaft of the stirring motor passes through the mixing box body and then is connected with the stirring blade, and the stirring motor is connected with the control unit 3; when the control device acquires output data to transmit smoke through a plurality of acquisition pipelines, the control device controls the stirring motor to act so as to drive the stirring blades to rotate in the mixing box body, so that the smoke entering the mixing box body is stirred, and the smoke in the mixing box body is more uniform;
the measuring unit 4 comprises a measuring pipeline and a measuring device, and one end of the measuring pipeline is communicated with the stirring unit 2; the measuring device is arranged on the measuring pipeline and is connected with the control unit 3; when the flue gas transmitted through the single acquisition pipeline enters the measurement pipeline, the flue gas is single, the measurement is directly carried out through the measurement device, the NOx content is obtained, and the obtained result is sent to the control unit 3; when the mixed gas is transmitted through a plurality of collecting pipelines, the mixed gas is stirred in a mixing box and then enters a measuring pipeline, the entering smoke is measured through a measuring device, the NOx content is obtained, the obtained result is sent to a control unit 3, and the control unit 3 performs corresponding operation on subsequent data; in the present invention, the measuring device is preferably a NOx detector.
According to the technical scheme, the data of the acquisition unit 1 are acquired under the control of the control unit 3, whether the smoke passes through single-path transmission or multi-path transmission is judged, and then the starting and stopping of the stirring unit 2 are controlled according to the judging result, when the smoke passes through the multi-path transmission, the smoke enters the stirring unit 2, enters the measurement unit 4 after being stirred by the stirring unit 2, and the measurement result of the multi-path smoke is acquired by the measurement unit 4; the equipment investment is reduced, and the measurement is performed in the advance, so that the investment of detection personnel can be reduced, and the workload of maintenance is reduced; in addition, the simultaneous measurement is realized after the multi-path centralized mixing, so that the smoke after stirring is more uniform, and the measurement result measured by the measuring device is more accurate after reaching the measuring device.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. A method for measuring NOx by multi-sample mixing and stirring, comprising the steps of:
s1, arranging a plurality of acquisition pipelines provided with detection devices between sampling points and a stirring unit, and establishing connection between a control unit and the detection devices, the stirring unit and a measurement unit on the acquisition pipelines;
s2, acquiring data acquired by a detection device when the flue gas passes through a plurality of acquisition pipelines through a control unit;
s3, the control unit controls the start and stop of the stirring unit according to the data acquired by the detection device;
s4, the flue gas passing through the stirring unit enters the measuring unit, and the entering flue gas is detected through the measuring unit, so that the NOx content in the flue gas is obtained.
2. An apparatus for measuring NOx using the multiple sample mixing agitation method of claim 1, comprising:
the acquisition unit is used for acquiring and transmitting the smoke, acquiring a smoke transmission state, and communicating one end of the smoke transmission state with a smoke sampling point;
the stirring unit is used for temporarily storing the flue gas transmitted in the acquisition unit and is communicated with the other end of the acquisition unit;
the control unit is used for acquiring the flue gas transmission data of the acquisition unit, controlling the stirring unit to start and stop, and being respectively connected with the acquisition unit and the stirring unit;
and the measuring unit is used for detecting the flue gas passing through the stirring unit, feeding back a detection result to the control unit and connecting the control unit.
3. The apparatus for measuring NOx by multi-sampling mixing stirring according to claim 2, wherein the collecting unit comprises:
the collecting pipelines are arranged between the sampling points and the stirring unit;
and the detection devices are respectively arranged on the acquisition pipeline.
4. A device according to claim 3, wherein the detection means is a smoke sensor.
5. The apparatus of claim 2, wherein the stirring unit comprises:
the mixing box body is communicated with one end of the collecting unit;
the stirring blade is arranged in the mixing box body;
and the output shaft of the stirring motor penetrates through the mixing box body and then is connected with the stirring blade, and the stirring motor is connected with the control unit.
6. The apparatus of claim 2, wherein the control unit comprises:
a console;
the control device is arranged in the control console and is respectively connected with the acquisition unit, the stirring unit and the measuring unit.
7. The apparatus of claim 2, wherein the measurement unit comprises:
one end of the measuring pipeline is communicated with the stirring unit;
and the measuring device is arranged on the measuring pipeline and is connected with the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010139959.9A CN113203827B (en) | 2020-03-03 | 2020-03-03 | NO is measured in multichannel sampling mixing stirring x Method and apparatus of (a) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010139959.9A CN113203827B (en) | 2020-03-03 | 2020-03-03 | NO is measured in multichannel sampling mixing stirring x Method and apparatus of (a) |
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| CN113203827B true CN113203827B (en) | 2023-09-29 |
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2020
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