CN116500294A - Pulverized coal particle flow velocity detection method - Google Patents
Pulverized coal particle flow velocity detection method Download PDFInfo
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- CN116500294A CN116500294A CN202310476277.0A CN202310476277A CN116500294A CN 116500294 A CN116500294 A CN 116500294A CN 202310476277 A CN202310476277 A CN 202310476277A CN 116500294 A CN116500294 A CN 116500294A
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- 239000003245 coal Substances 0.000 title claims abstract description 73
- 239000002245 particle Substances 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 title abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 76
- 238000012545 processing Methods 0.000 claims abstract description 24
- 230000006698 induction Effects 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 230000002776 aggregation Effects 0.000 claims abstract description 4
- 238000004220 aggregation Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 26
- 238000000605 extraction Methods 0.000 claims description 16
- 238000005303 weighing Methods 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 4
- 239000002817 coal dust Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 239000000523 sample Substances 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000000428 dust Substances 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013499 data model Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012821 model calculation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/08—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring variation of an electric variable directly affected by the flow, e.g. by using dynamo-electric effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Life Sciences & Earth Sciences (AREA)
- Measuring Volume Flow (AREA)
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention relates to the technical field of pulverized coal flow detection, in particular to a pulverized coal particle flow velocity detection method, which comprises the following steps: s1, setting a physical sampling assembly and a sensor sampling assembly; s2, extracting air from a physical part, sampling, and acquiring signal data by a sensor main body of a sensor part; s3, measuring the flow velocity of the physical part through the wind speed and the weight of the pulverized coal; the sensor part outputs through analog calculation; physical data average value processing and sensor data impurity removal processing; s4, carrying out aggregation processing on the physical result and the sensor result to form final flow velocity data; by adopting the invention, the whole flow is optimized, the constant-speed sampling weight measurement of the physical automatic sampling is realized, and the sensor probe is combined to induce the alternating current charge; double insurance of physical and digital detection is realized; and because the characteristic of exchanging the induction detection, the influence of immature coating and surface dust, the characteristic of avoiding maintaining promotes the operating efficiency, but the cooperation blowback type physics is weighed and is sampled, avoids error and the danger of manual sampling.
Description
Technical Field
The invention relates to the technical field of pulverized coal flow detection, in particular to a pulverized coal particle flow velocity detection method.
Background
The flow rate of pulverized coal particles is an important operation parameter of a primary air pipe in thermal power generation, the size of the flow rate of the pulverized coal directly influences the amount of the pulverized coal in a powder conveying pipeline, and too much and too little pulverized coal can influence the combustion efficiency of the pulverized coal; insufficient combustion can also cause the emission of nitrogen oxides to increase and pollute the environment, and serious problems of partial combustion and coking of the boiler can be caused. The method has close relations on the overall economic benefit, safety and environmental protection of the power enterprise;
most of the measuring methods of the flow rate and the flow rate of the pulverized coal stay in a theoretical stage, such as a microwave method, an ultrasonic method, a capacitance tomography method, a capacitance method and the like, and the measuring environments are complex due to different pulverized coal qualities, different water contents of the pulverized coal and different pulverized coal temperatures on site, and the methods are all indirect measuring methods, so that the detected physical quantity of the methods is difficult to correspond to the flow rate of the pulverized coal, and the methods cannot be effectively used on an industrial site;
therefore, there is a need for a parallel on-line detection method that can combine physical sampling test and charge-inductance synchronization.
Disclosure of Invention
The invention aims to provide a method for detecting the flow velocity of pulverized coal particles so as to solve the technical problems.
In order to achieve the above object, the present invention provides the following technical solutions;
the method for detecting the flow velocity of the pulverized coal particles comprises the following steps:
s1, arranging a plurality of groups of physical sampling components and sensor sampling components in a coal powder pipeline to be tested;
s2, in a testing stage, the physical sampling assembly performs air extraction sampling, and a sensor main body on the sensor sampling assembly acquires a coal dust concentration signal; the method comprises the steps of physically sampling part of pulverized coal particles, entering a subsequent weighing stage, and performing analog calculation on a sensor sampling signal by a signal processing unit;
s3, calculating the collected pulverized coal weight data and the set wind speed in the pipeline to obtain the real flow velocity of the pulverized coal; the industrial control host performs average value processing on a plurality of groups of physical samples, and performs impurity removal processing on a plurality of groups of sensor samples;
s4, based on the physical sampling result after the mean value and the sensor sampling result, carrying out data aggregation processing, and outputting the final pulverized coal particle flow velocity;
further, the physical sampling assembly in the step S1 comprises a multipoint sampling gun, an air extraction assembly, a separation mechanism and a weighing assembly; the sensor sampling assembly comprises a sensor body, a signal processing unit and an analog calculation unit; the weighing assembly is a gravity sensor, and data processing is carried out by the analog computing unit together with the data acquired by the gravity sensor and the data acquired by the sensor body:
further, the air extraction component is connected with an external negative pressure structure, and the air speed in the air extraction pipeline and the flow speed in the coal powder pipeline are synchronized through a negative pressure regulator; the air exhaust pipeline is connected with the separating mechanism;
further, the air extraction separation mechanism comprises a cyclone separator and a sampling tank; the sampling tank is arranged above the weighing assembly;
further, the sensor body is a charge induction sensor, and a high-temperature resistant insulating coating is arranged on the outer surface of the charge induction sensor;
further, the multipoint sampling guns are arranged into two groups with different heights;
compared with the prior art, the invention has the following beneficial effects:
by adopting the invention, the whole flow is optimized, the constant-speed sampling weight measurement of the physical automatic sampling is realized, and the sensor probe is combined to induce the alternating current charge; double insurance of physical and digital detection is realized; and because the characteristic of exchanging the response and surveying, the influence of immature coating and surface dust, the characteristic of avoiding maintaining promotes the operating efficiency more, but the cooperation blowback type physics is weighed the sample, avoids error and the danger of manual sampling.
Drawings
FIG. 1 is a schematic diagram of 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.
Referring to fig. 1, a method for detecting the flow rate of pulverized coal particles comprises the following steps:
the method for detecting the flow velocity of the pulverized coal particles comprises the following steps:
s1, arranging a plurality of groups of physical sampling components and sensor sampling components in a coal powder pipeline to be tested;
the physical sampling assembly comprises a multipoint sampling gun, an air extraction assembly, a separation mechanism and a weighing assembly; the sensor sampling assembly comprises a sensor body, a signal processing unit and an analog calculation unit; the weighing assembly is a gravity sensor, and data acquisition of the weighing assembly and data acquisition of the sensor body are processed together by the analog computing unit; the air extraction component is connected with an external negative pressure structure, and the air speed in the air extraction pipeline and the flow speed in the coal powder pipeline are synchronized through a negative pressure regulator; the air exhaust pipeline is connected with the separating mechanism; the air extraction separation mechanism comprises a cyclone separator and a sampling tank; the sampling tank is arranged above the weighing assembly;
in the physical sampling stage, in the air extraction assembly, the pulverized coal particles in the pulverized coal pipeline are extracted into a sampling pipe of the multipoint sampling gun, and the negative pressure regulator can change the flow velocity in the sampling pipe to ensure that the pulverized coal flow velocity V1 in the pulverized coal pipeline is equal to the pulverized coal flow velocity V2 in the sampling pipe;
s2, in a testing stage, the physical sampling assembly performs air extraction sampling, and a sensor main body on the sensor sampling assembly acquires a coal dust concentration signal; the method comprises the steps of physically sampling part of pulverized coal particles, entering a subsequent weighing stage, and performing analog calculation on a sensor sampling signal by a signal processing unit;
the pulverized coal particles are collected under the action of a cyclone separator, and the pulverized coal particles are collected in a constant-speed sampling mode; the air speed sensor is arranged on the raw coal powder pipeline to realize the measurement of the flow velocity V1 in the coal powder pipeline, the industrial control host controls the negative pressure regulator through the difference DeltaV of the two coal powder flow velocities, and then the air suction pressure is adjusted, so that the flow velocity V2 of the sampling pipeline is changed, the two coal powder flow velocities V1 and V2 are ensured to be equal, and the constant-speed sampling is realized;
the sensor body is a charge induction sensor, and the outer surface of the charge induction sensor is provided with a high-temperature resistant insulating coating;
in the sampling of the sensor, a charge induction sensor is arranged on a coal powder pipeline, an equivalent induction charge is generated by utilizing a charge field generated by coal powder in the pipeline in real time, the concentration in the coal powder pipeline is directly measured by an alternating current coupling charge induction technology, a signal processing unit is used for acquiring the equivalent induction charge from an induction charge component and processing the equivalent induction charge, and a model calculation unit calculates related signals through a data model in an industrial personal computer to obtain online measurement of the concentration, the wind speed and the fineness in a primary air pipeline;
s3, calculating the collected pulverized coal weight data and the set wind speed in the pipeline to obtain the real flow velocity of the pulverized coal; the industrial control host performs average value processing on a plurality of groups of physical samples, and performs impurity removal processing on a plurality of groups of sensor samples;
in the physical sampling data, the collected pulverized coal particles are weighed through a weighing assembly mechanism to obtain the mass of a coal sample, and the mass flow of the pulverized coal is calculated, wherein the process is as follows: before sampling starts, the electric signal of the industrial control host is used for obtaining the processing gravity M0 of the gravity sensor; during sampling, after the pulverized coal particles collected from the pulverized coal pipeline are separated by the industrial control host through the cyclone separator, the pulverized coal is collected into a sampling tank to obtain the processing gravity M1 of the gravity sensor 12, the sampled pulverized coal mass M=M1-M0 is obtained through calculation by the analog calculation unit, and the pulverized coal mass flow in the pulverized coal pipeline is further calculated; knowing the mass of the pulverized coal and the wind speed in a pulverized coal pipeline, the mass of pulverized coal particles in a required unit time can be obtained, and the average value of the multiple groups of physical sampling data is obtained;
the physical sampling assembly also comprises a compressed air source and an electric ball valve, wherein the external air source is connected with the sampling tank and is controlled to be opened and closed by the electric ball valve; when the electric ball valve is fully opened, the external air source is controlled to be opened, compressed air sequentially blows the weighed pulverized coal into the pulverized coal pipeline through the cyclone separator and the sampling tank through the electric ball valve, after the pulverized coal in the sampling tank is completely purged, the external air source is closed, the electric ball valve is closed at the same time, the whole measuring process is finished, the whole measuring process returns to an initial state, and the starting of the next system flow is waited.
S4, based on the physical sampling result after the mean value and the sensor sampling result, carrying out data aggregation processing, and outputting the final pulverized coal particle flow velocity;
further, the multipoint sampling guns are arranged into two groups with different heights;
by adopting the invention, the whole flow is optimized, the constant-speed sampling weight measurement of the physical automatic sampling is realized, and the sensor probe is combined to induce the alternating current charge; double insurance of physical and digital detection is realized; and because the characteristic of exchanging the response and surveying, the influence of immature coating and surface dust, the characteristic of avoiding maintaining promotes the operating efficiency more, but the cooperation blowback type physics is weighed the sample, avoids error and the danger of manual sampling.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the scope of the invention as defined in the accompanying claims.
Claims (6)
1. The method for detecting the flow velocity of the pulverized coal particles is characterized by comprising the following steps of:
s1, arranging a plurality of groups of physical sampling components and sensor sampling components in a coal powder pipeline to be tested;
s2, in a testing stage, the physical sampling assembly performs air extraction sampling, and a sensor main body on the sensor sampling assembly acquires a coal dust concentration signal; the method comprises the steps of physically sampling part of pulverized coal particles, entering a subsequent weighing stage, and performing analog calculation on a sensor sampling signal by a signal processing unit;
s3, calculating the collected pulverized coal weight data and the set wind speed in the pipeline to obtain the real flow velocity of the pulverized coal; the industrial control host performs average value processing on a plurality of groups of physical samples, and performs impurity removal processing on a plurality of groups of sensor samples;
and S4, based on the physical sampling result after the mean value and the sensor sampling result, carrying out data aggregation processing, and outputting the final pulverized coal particle flow velocity.
2. The method according to claim 1, wherein the physical sampling assembly in S1 comprises a multipoint sampling gun, an air extraction assembly, a separation mechanism and a weighing assembly; the sensor sampling assembly comprises a sensor body, a signal processing unit and an analog calculation unit; the weighing assembly is a gravity sensor, and data processing is carried out by the analog computing unit together with data acquired by the gravity sensor and data acquired by the sensor body.
3. The method for detecting the flow rate of pulverized coal particles according to claim 2, wherein the air extraction component is connected with an external negative pressure structure, and the air speed in the air extraction pipeline and the flow rate in the pulverized coal pipeline are synchronized through a negative pressure regulator; the air exhaust pipeline is connected with the separating mechanism.
4. A method for detecting the flow rate of pulverized coal particles according to claim 3, wherein the air extraction separation mechanism comprises a cyclone separator and a sampling tank; the sampling tank is arranged above the weighing assembly.
5. The method for detecting the flow rate of pulverized coal particles according to claim 2, wherein the sensor body is a charge induction sensor, and the outer surface of the charge induction sensor is provided with a high-temperature resistant insulating coating.
6. A method for detecting the flow rate of pulverized coal particles according to claim 2, wherein the multipoint sampling guns are arranged in two groups of different heights.
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| CN202310476277.0A CN116500294A (en) | 2023-04-28 | 2023-04-28 | Pulverized coal particle flow velocity detection method |
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| CN202310476277.0A CN116500294A (en) | 2023-04-28 | 2023-04-28 | Pulverized coal particle flow velocity detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117368518A (en) * | 2023-12-04 | 2024-01-09 | 湖北工业大学 | System and method for measuring ultrasonic flight time in pipeline |
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- 2023-04-28 CN CN202310476277.0A patent/CN116500294A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117368518A (en) * | 2023-12-04 | 2024-01-09 | 湖北工业大学 | System and method for measuring ultrasonic flight time in pipeline |
| CN117368518B (en) * | 2023-12-04 | 2024-02-23 | 湖北工业大学 | System and method for measuring ultrasonic flight time in pipeline |
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