CN117074107A - Online fly ash carbon content detecting system - Google Patents
Online fly ash carbon content detecting system Download PDFInfo
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- CN117074107A CN117074107A CN202310811706.5A CN202310811706A CN117074107A CN 117074107 A CN117074107 A CN 117074107A CN 202310811706 A CN202310811706 A CN 202310811706A CN 117074107 A CN117074107 A CN 117074107A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 72
- 239000010881 fly ash Substances 0.000 title claims abstract description 56
- 239000000843 powder Substances 0.000 claims abstract description 108
- 238000001514 detection method Methods 0.000 claims abstract description 42
- 238000002156 mixing Methods 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000003860 storage Methods 0.000 claims description 43
- 239000000463 material Substances 0.000 claims description 13
- 238000002536 laser-induced breakdown spectroscopy Methods 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 13
- 239000002956 ash Substances 0.000 description 12
- 238000005070 sampling Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 8
- 238000005303 weighing Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000009774 resonance method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000691 measurement method 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
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011897 real-time detection Methods 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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
-
- 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
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
-
- 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
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- 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
Abstract
The invention relates to an online fly ash carbon content detection system, which comprises a powder taking device, a carbon content detection device and a returning device, wherein the powder taking device is used for taking out the powder; the powder taking device is used for: the negative pressure is utilized to obtain a gas-powder mixture from a gas-powder mixing pipeline, gas-powder separation is carried out, and the collected powder is extruded and molded; the carbon content detection device is used for: detecting the carbon content of the extruded powder; the returning charge device is used for: mixing the detected extruded powder with air, and conveying the newly obtained gas-powder mixture into a gas-powder mixing pipeline. The device can ensure the detection precision, can stably operate for a long time, has low maintenance cost, can return the collected powder into the gas-powder mixing pipeline, and can be suitable for sites such as coal-fired power plants.
Description
Technical Field
The invention relates to the technical field of fly ash carbon content detection, in particular to an online fly ash carbon content detection system.
Background
With the perfection of a DCS system and monitoring control means, the safety operation technology of the coal-fired power generation boiler is guaranteed not to have too great problems, with the reform of an electric power system, the separation of factories and nets are being realized, price competing and surfing are carried out, electric power production enterprises pay more attention to the economy and environmental protection of boiler combustion, when the carbon content of fly ash is high, serious economic and environmental consequences are caused to a power plant, which means that fuel is not effectively utilized, the power generation cost is increased, and NO is caused x The discharge amount increases, affecting the environmental quality. In the past, a burning weighing method is used for measuring the carbon content of fly ash in a power plant, but the result is at least delayed for several hours compared with the actual working condition of a boiler, and the combustion adjustment of the boiler cannot be guided in real time. The carbon content of the boiler fly ash is one of main indexes of the combustion efficiency and the running economy of the coal-fired boiler of the thermal power plant. With the continuous development of large capacity and high parameters of the generator set, on-line detection of carbon content in boiler fly ash is realized, so as to control and optimize boiler combustion, reduce power generation coal consumption, and improve the competitive price surfing capability and the comprehensive utilization capability of fly ash are increasingly important and urgent.
The online real-time detection of the carbon content of the fly ash is beneficial to guiding operators to timely adjust the boiler combustion and the pulverizing system, and improves the boiler combustion efficiency and the control level.
At present, the fly ash carbon content online measurement method widely accepted at home and abroad is an online firing weightlessness method and a microwave method. The method is characterized in that: and collecting ash samples by using a sampling tube, then placing the ash samples in a microwave channel, and utilizing the change of the carbon content in the fly ash to cause the change of an electric signal so as to achieve the purpose of measurement. How to solve the representativeness and continuity of fly ash sampling and how to ensure the service life of the sampling device has become the most concerned problem for wide users and production factories.
The detection of boiler fly ash is realized by an on-line firing weightlessness method, and the system adopts a multi-point self-pumping sampling unit without external power to automatically collect ash samples in a flue into a crucible of a measuring unit. Firstly, weighing a crucible, then weighing the crucible with the collected ash sample, then sending the crucible with the ash sample into a burning device by an executing mechanism for high-temperature burning, then weighing the burned crucible, collecting an upper computer by a PLC (programmable logic controller) and calculating the three weight signals, wherein the carbon content of the obtained fly ash can be displayed on a PC interface, namely a display screen of a control unit. In addition, the ash discharging device arranged in the system can discharge the burnt ash sample back to the flue, and then the measurement of the next period is carried out. The technology needs the combination of the traditional high-precision measurement technology and the unique industrial field anti-interference design technology, and realizes the high-precision and intelligent continuous online measurement of the carbon content of the fly ash. The technology has high measurement accuracy, is not influenced by the change of coal types, and has wide measurement range of carbon content. The fly ash carbon detector of the cantilever type weightlessness method commonly used at present has poor stability and reliability in long-term operation, an actuating mechanism of the system needs to carry out a series of repeated actions such as sampling, burning, weighing, ash cleaning and the like, and the system needs to work under extremely severe conditions, so that long-term reliable operation is very difficult. In addition, oxidation of the heating element of the burning furnace, blockage of the fly ash separating device, abrasion of mechanical parts, and interference of the electronic weighing device in a high-temperature dusty environment are also important reasons for influencing the use measurement accuracy and service life of the electronic weighing device.
An online microwave attenuation method fly ash carbon content detection device and an online microwave resonance method fly ash carbon content detection device. The measurement principle is as follows: and analyzing and determining the content of carbon in the fly ash according to the absorption characteristic of unburned carbon in the fly ash to microwave energy.
The microwave attenuation method is to collect the ash sample in the flue into a sampling bottle by adopting a sampling method during impact, and then to carry out microwave measurement through a measuring device; the boiler fly ash contains unburned carbon particles, and the carbon has an absorption effect on microwaves due to conductivity, and the absorption requires that the measured medium is in a forbidden state, so that a short measurement process is required. The microwave absorption process has two main aspects: firstly, the carbon content of the tested fly ash sample is higher, and the higher the carbon content is, the higher the microwave absorption is. Conversely, the less the carbon content, the less the microwave is absorbed; secondly, the number of the tested fly ash samples is the same as the ash sample with the carbon content, the more the tested samples are, the more the tested samples absorb microwaves, and conversely, the fewer the tested samples are, the less the tested samples absorb microwaves.
Technical disadvantage: the detection modes of the microwave attenuation method and the microwave resonance method are both indirect deduction, curve calibration is needed, the calibration is needed frequently, the sampling mode is an impact type, and the single-point constant speed type is better, the calibration and the sampling modes cause large maintenance amount, and the accuracy of the coal type is also poor when the coal type is changed. At present, the fly ash carbon content on-line detection device of the microwave attenuation method and the microwave resonance method is basically paralyzed in the power plant.
In summary, no reliable and accurate equipment application exists in online fly ash carbon content detection, and the technology is improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing an online fly ash carbon content detection system aiming at the defects of the prior art.
The technical scheme of the online fly ash carbon content detection system provided by the invention is as follows:
comprises a powder taking device, a carbon content detecting device and a returning device;
the powder taking device is used for: the negative pressure is utilized to obtain a gas-powder mixture from a gas-powder mixing pipeline, gas-powder separation is carried out, and the collected powder is extruded and molded;
the carbon content detection device is used for: detecting the carbon content of the extruded powder;
the material returning device is used for: mixing the detected extruded powder with air, and conveying the newly obtained gas-powder mixture into the gas-powder mixing pipeline.
The invention has the following beneficial effects:
the detection precision can be ensured, the long-term stable operation can be realized, the maintenance cost is low, the collected powder can be returned to the gas-powder mixing pipeline, and the device can be suitable for fields such as power plants.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings in which:
FIG. 1 is a schematic diagram of an online fly ash carbon content detection system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing a state of an online fly ash carbon content detection system for collecting a gas-powder mixture according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing a state of carbon content detection by an online fly ash carbon content detection system according to an embodiment of the invention;
FIG. 4 is a schematic diagram showing a state of the online fly ash carbon content detection system for returning materials according to an embodiment of the invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. a gas-powder mixing pipeline; 2. an exhaust pipe; 3. a first valve; 4. a first negative pressure fan; 5. a pressure gauge; 6. a cyclone separator; 7. a second valve; 8. a feed pipe; 9. a first level gauge; 10. a first hopper; 11. a third valve; 12. a screw conveyor; 13. an open feed delivery tube; 14. a receiving hopper; 15. a negative pressure pipe; 16. a second negative pressure fan; 17. a fourth valve; 18. a fifth valve; 19. a second level gauge; 20. discharging guide pipes; 21. a sixth valve; 22. a seventh valve; 23. a compressed air tube; 24. a second hopper; 25. a flat transverse tube; 26. an eighth valve; 27. LIBS analyzer.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
As shown in FIG. 1, the online fly ash carbon content detection system of the embodiment of the invention comprises a powder taking device, a carbon content detection device and a returning device;
the powder taking device is used for: the negative pressure is utilized to obtain a gas-powder mixture from the gas-powder mixing pipeline 1, gas-powder separation is carried out, and the collected powder is extruded and molded;
the carbon content detection device is used for: detecting the carbon content of the extruded powder;
the returning charge device is used for: and mixing the detected extruded powder with air, and conveying the newly obtained gas-powder mixture into a gas-powder mixing pipeline 1.
Optionally, in the above technical solution, the powder taking device includes: a first negative pressure fan 4, a cyclone separator 6, a first storage hopper 10, a screw conveyor 12 and an open delivery pipe 13, and a feed pipe 8 and an exhaust pipe 2 which are respectively communicated with the gas-powder mixing pipeline 1; the other end of the exhaust pipe 2 is communicated with a first negative pressure fan 4, and the other end of the feed pipe 8 is communicated with a cyclone separator 6;
when the first negative pressure fan 4 operates, negative pressure is formed, so that a gas-powder mixture is obtained from the gas-powder mixing pipeline 1 through the feeding pipe 8 and is fed into the cyclone separator 6;
the cyclone separator 6 performs gas-powder separation on the obtained gas-powder mixture, and conveys the collected powder into the first storage hopper 10, and the spiral conveyor 12 extrudes the powder in the first storage hopper 10 and conveys the powder into the open conveying pipe 13 for forming;
the carbon content detection device is used for: the carbon content of the extruded powder in the open delivery pipe 13 was detected.
Optionally, in the above technical solution, the powder feeding device further includes a receiving hopper 14, and the open feeding pipe 13 is communicated with the receiving hopper 14 to feed the detected extruded powder into the receiving hopper 14.
Optionally, in the above technical solution, the material returning device includes a second storage hopper 24, a negative pressure pipe 15, a second negative pressure fan 16, a horizontal pipe 25, a compressed air pipe 23 and a discharge guide pipe 20;
two ends of the negative pressure pipe 15 are respectively communicated with the receiving hopper 14 and the gas-powder mixing pipeline 1, and a second negative pressure fan 16 is arranged on the negative pressure pipe 15;
the two ends of the horizontal pipe 25 are communicated with the negative pressure pipe 15 and the second storage hopper 24; when the second storage hopper 24 is charged, the gas in the second storage hopper 24 is sucked out by a second negative pressure fan connected with a balance pipe 25 and discharged into the gas-powder mixing pipeline 1 through a discharge guide pipe 20 and an exhaust pipe 2, so that the air in the second storage hopper 24 is eliminated.
The second storage hopper 24 is respectively communicated with the compressed air pipe 23 and the discharge guide pipe 20, and the other end of the discharge guide pipe 20 is communicated with the exhaust pipe 2;
when the second negative pressure fan 16 operates, negative pressure is generated in the negative pressure pipe 15, external air is sucked into the second storage hopper 24 through the compressed air pipe 23, so that the detected extruded powder is mixed with the gas of the compressed air pipe 23, and the newly obtained gas-powder mixture is conveyed into the gas-powder mixing pipeline 1 after sequentially passing through the discharge guide pipe 20 and the exhaust pipe 2.
Optionally, in the above technical solution, the exhaust pipe 2 is provided with a first valve 3, and the feed pipe 8 is provided with a second valve 7.
Optionally, in the above technical solution, a third valve 11 is disposed between the first storage hopper 10 and the screw conveyor 12, and a fourth valve 17 is disposed on a part of the negative pressure pipe 15 between the second negative pressure fan 16 and the gas-powder mixing pipe 1.
Optionally, in the above technical solution, a fifth valve 18 is disposed between the receiving hopper 14 and the second storage hopper 24, a sixth valve 21 is disposed on the discharge guide pipe 20, and a seventh valve 22 is disposed on the compressed air pipe 23.
Optionally, in the above technical solution, the first hopper 10 is provided with a first level gauge 9, and the second hopper 24 is provided with a second level gauge 19.
Alternatively, in the above-described technical solution, the carbon content detecting means is a LIBS analyzer 27.
The following examples are provided to illustrate the details:
the embodiment of the invention provides an online fly ash carbon content detection system, which comprises the following components: the device comprises an exhaust pipe 2, a first valve 3, a first negative pressure fan 4, a pressure gauge 5, a cyclone separator 6, a second valve 7, a feed pipe 8, a first material level gauge 9, a first storage hopper 10, a third valve 11, a screw conveyor 12, an open material conveying pipe 13, a material receiving hopper 14, a negative pressure pipe 15, a second negative pressure fan 16, a fourth valve 17, a fifth valve 18, a second material level gauge 19, a material discharging guide pipe 20, a sixth valve 21, a seventh valve 22, a compressed air pipe 23, a second storage hopper 24, a horizontal pipe 25, an eighth valve 26 and a LIBS analyzer 27;
the exhaust pipe 2 is inserted into the gas-powder mixing pipeline 1 to realize communication with the gas-powder mixing pipeline 1, the first valve 3 is arranged in the exhaust pipe 2, the inlet of the first negative pressure fan 4 is connected with the upper opening of the cyclone separator 6, and the outlet of the first negative pressure fan 4 is connected with the exhaust pipe 2; the upper part of the cyclone separator 6 is provided with a pressure gauge 5, the side surface of the cyclone separator 6 is provided with a feed pipe 8, the feed pipe 8 is internally provided with a second valve 7, the upper part of the first storage hopper 10 is connected with the lower opening of the cyclone separator 6, and the lower part of the first storage hopper 10 is connected with a third valve 11; the first level gauge 9 is arranged above the first storage hopper 10; the lower opening of the third valve 11 is connected with the feed inlet of the screw conveyor 12, and the discharge outlet of the screw conveyor 12 is connected with the open conveying pipe 13; the upper opening of the receiving hopper 14 is connected with the outlet of the open conveying pipe 13, and a negative pressure pipe 15 is arranged at the upper part of the receiving hopper 14; the negative pressure pipe 15 is close to the proximal end of the receiving hopper 14 and is connected with the inlet of the second negative pressure fan 16, the distal end of the negative pressure pipe 15 is connected with the fourth valve 17, the other end of the negative pressure pipe 15 is inserted into the gas-powder mixing pipeline 1 and is communicated with the gas-powder mixing pipeline 1, and the lower opening of the receiving hopper 14 is connected with the fifth valve 18; the upper opening of the second storage hopper 24 is connected with the fifth valve 18, the second level gauge 19 is arranged at the upper part of the second storage hopper 24, and the other end of the horizontal pipe 25 is connected with the negative pressure pipe 15; the discharge guide pipe 20 is arranged at the upper part of the second storage hopper 24, one end of the discharge guide pipe is inserted into the second storage hopper 24, the other end of the discharge guide pipe is inserted into the gas-powder mixing pipeline 1 and is communicated with the gas-powder mixing pipeline 1, an eighth valve 26 is arranged on the horizontal pipe 25, when the second storage hopper 24 is used for feeding materials, the gas in the second storage hopper 24 is sucked out through a second negative pressure fan connected with the balance pipe 25 and is discharged into the gas-powder mixing pipeline 1 through the discharge guide pipe 20 and the exhaust pipe 2, so that the air in the second storage hopper 24 is eliminated, and a sixth valve 21 is arranged in the middle of the discharge guide pipe 20; a compressed air pipe 23 is arranged at the side of the bottom of the second storage hopper 24, and a seventh valve 22 is arranged on the compressed air pipe 23; the LIBS analyser 27 is mounted at the upper opening of the open delivery conduit 13.
Wherein, the discharge pipe 2, the first valve 3, the first negative pressure fan 4, the pressure gauge 5, the cyclone separator 6, the second valve 7 and the feed pipe 8 form a negative pressure cyclone separation system, and the fly ash in the gas-powder mixing pipeline 1, namely powder, is pumped out and separated, and the separated gas is discharged back into the gas-powder mixing pipeline 1. The first storage hopper 10, the third valve 11, the screw conveyor 12 and the open conveying pipe 13 form a sample preparation system, the fly ash is extruded by the screw conveyor 12, the extruded fly ash is scraped to be flat by the open conveying pipe 13, a contour powder column is formed on the upper surface, and then the carbon content of the fly ash is detected by adopting a Laser Induced Breakdown Spectroscopy (LIBS) analysis technology.
The working mode of the online fly ash carbon content detection system provided by the invention is as follows:
firstly, all valves are in a closed state, and the first negative pressure fan 4, the second negative pressure fan 16 and the cyclone separator 6 are in a closed state;
the powder state is taken, as shown in fig. 2, the first valve 3 is opened, the second valve 7 is opened, then the first negative pressure fan 4 is opened, so that negative pressure is generated in the cyclone separator 6, the gas-powder mixture in the gas-powder mixing pipeline 1 is pumped into the cyclone separator 6 for gas-powder separation, the separated gas is discharged into the gas-powder mixing pipeline 1 through the exhaust pipe 2, the separated powder, namely the fly ash, falls into the first storage hopper 10, at the moment,
the carbon content detection state is shown in fig. 3, when the first level gauge 9 is started, a signal is sent to indicate that the first storage hopper 10 is full; when the third valve 11 receives the signal of the first level gauge 9, the third valve 11 is started to be opened, the second negative pressure fan 16 is started, the fifth valve 18 is started, and the eighth valve 26 is started; simultaneously, the screw conveyor 12 is started to extrude and shape the powder in the first storage hopper 10, the extruded powder passes through the open conveying pipe 13, the open conveying pipe 13 is a pipe with a D-shaped section, specifically, a round pipe is cut into two parts along the axial section, one part of the round pipe is taken, a cover plate is covered on the axial section to obtain a pipe with the D-shaped section, when the powder passes through the open conveying pipe 13, the powder is extruded into a D-shaped with a flat opening upwards, the extruded powder can be shaped into a D-shaped, the flat opening of the D-shaped is upwards, and one part of the D-shaped forms a horizontal plane; the LIBS analyzer 27 is started to detect the carbon content of the extruded powder; the powder material after detection falls through the hopper 14 into the second hopper 24.
The return state is shown in fig. 4, when the second level gauge 19 is started, a signal is sent to indicate that the second storage hopper 24 is full; when receiving the signal of the second level gauge 19, the fifth valve 18 is closed, the eighth valve 26 is closed, then the sixth valve 21 is opened, and the seventh valve 22 is opened; compressed air enters the second storage hopper 24 through the compressed air pipe 23, and after being mixed with powder in the second storage hopper 24, the air is discharged from the discharge guide pipe 20 and enters the gas-powder mixing pipeline 1 through the exhaust pipe 2. The first level gauge 9 is started and sends out a signal, the second level gauge 19 is started and sends out a signal, and subsequent linkage control can be controlled through PLC programming.
The invention relates to an online detection system for the carbon content of fly ash in a boiler flue, which is applied to the boiler flue of a coal-fired power generation unit, and the carbon content of the fly ash in the extraction flue is detected online in real time. And (3) automatically sampling by using a negative pressure extraction mode, and detecting the carbon content of the fly ash by using a Laser Induced Breakdown Spectroscopy (LIBS) analysis technology, wherein the detected fly ash is automatically returned to the flue. The invention can detect the carbon content data of the boiler fly ash on line in real time and complete sampling and returning to the flue fully automatically. No ash is deposited in the pipeline, negative pressure power is used for sucking materials, and the power is high. Can prevent from blocking during ash taking, and can sample in real time in the gas-powder mixing pipeline 1, thereby being representative. The detection accuracy is high.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. An online fly ash carbon content detection system is characterized by comprising a powder taking device, a carbon content detection device and a returning device;
the powder taking device is used for: the negative pressure is utilized to obtain a gas-powder mixture from a gas-powder mixing pipeline, gas-powder separation is carried out, and the collected powder is extruded and molded;
the carbon content detection device is used for: detecting the carbon content of the extruded powder;
the material returning device is used for: mixing the detected extruded powder with air, and conveying the newly obtained gas-powder mixture into the gas-powder mixing pipeline.
2. The on-line fly ash carbon content detection system of claim 1, wherein the dust extraction device comprises: the device comprises a first negative pressure fan, a cyclone separator, a first storage hopper screw conveyor, an opening conveying pipe, a feeding pipe and an exhaust pipe, wherein the feeding pipe and the exhaust pipe are respectively communicated with the gas-powder mixing pipeline; the other end of the exhaust pipe is communicated with the first negative pressure fan, and the other end of the feed pipe is communicated with the cyclone separator;
when the first negative pressure fan operates, negative pressure is formed, so that a gas-powder mixture is obtained from the gas-powder mixing pipeline through the feeding pipe and is fed into the cyclone separator;
the cyclone separator performs gas-powder separation on the obtained gas-powder mixture, and conveys the collected powder into the first storage hopper, and the screw conveyor extrudes the powder in the first storage hopper and conveys the powder into the open conveying pipe for forming;
the carbon content detection device is used for: and detecting the carbon content of the extruded powder in the open conveying pipe.
3. The on-line fly ash carbon content detection system of claim 2, further comprising a receiving hopper, wherein the open delivery conduit is in communication with the receiving hopper for delivering the detected extruded powder into the receiving hopper.
4. An online fly ash carbon content detection system according to claim 3, wherein the material returning device comprises a second storage hopper, a negative pressure pipe, a second negative pressure fan, a horizontal flat pipe, a compressed air pipe and a discharge guide pipe;
the two ends of the negative pressure pipe are respectively communicated with the receiving hopper and the gas-powder mixing pipeline, and the negative pressure pipe is provided with the second negative pressure fan;
two ends of the horizontal pipe are communicated with the negative pressure pipe and the second storage hopper;
the second storage hopper is respectively communicated with the compressed air pipe and the discharge guide pipe, and the other end of the discharge guide pipe is communicated with the exhaust pipe;
when the second negative pressure fan operates, negative pressure is generated in the negative pressure pipe, external air is sucked into the second storage hopper through the compressed air pipe, so that the detected extruded powder is mixed with sucked air, and the newly obtained gas-powder mixture is conveyed into the gas-powder mixing pipeline after sequentially passing through the discharge guide pipe and the exhaust pipe.
5. The system for detecting the carbon content of the fly ash on line according to claim 4, wherein the exhaust pipe is provided with a first valve, and the feed pipe is provided with a second valve.
6. An online fly ash carbon content detection system according to claim 5, wherein,
and a third valve is arranged between the first storage hopper and the screw conveyor, and a fourth valve is arranged on a part of the pipeline, which is positioned between the second negative pressure fan and the gas-powder mixing pipeline, on the negative pressure pipe.
7. The system for detecting the carbon content of the fly ash on line according to claim 6, wherein a fifth valve is arranged between the receiving hopper and the second storage hopper, a sixth valve is arranged on the discharge guide pipe, and a seventh valve is arranged on the compressed air pipe.
8. The system for detecting the carbon content of the fly ash on line according to claim 4, wherein the first storage hopper is provided with a first level gauge, and the second storage hopper is provided with a second level gauge.
9. An on-line fly ash carbon content detection system according to any one of claims 1 to 8, wherein the carbon content detection device is a LIBS analyser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310811706.5A CN117074107A (en) | 2023-07-04 | 2023-07-04 | Online fly ash carbon content detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310811706.5A CN117074107A (en) | 2023-07-04 | 2023-07-04 | Online fly ash carbon content detecting system |
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| Publication Number | Publication Date |
|---|---|
| CN117074107A true CN117074107A (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310811706.5A Pending CN117074107A (en) | 2023-07-04 | 2023-07-04 | Online fly ash carbon content detecting system |
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| Country | Link |
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| CN (1) | CN117074107A (en) |
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2023
- 2023-07-04 CN CN202310811706.5A patent/CN117074107A/en active Pending
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