CN114904658A - On-line ash deposition thickness measuring device and electric dust collector control method - Google Patents
On-line ash deposition thickness measuring device and electric dust collector control method Download PDFInfo
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- CN114904658A CN114904658A CN202210487772.7A CN202210487772A CN114904658A CN 114904658 A CN114904658 A CN 114904658A CN 202210487772 A CN202210487772 A CN 202210487772A CN 114904658 A CN114904658 A CN 114904658A
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- 239000000428 dust Substances 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008021 deposition Effects 0.000 title claims abstract description 14
- 230000005684 electric field Effects 0.000 claims abstract description 34
- 230000008054 signal transmission Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 239000012717 electrostatic precipitator Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/74—Cleaning the electrodes
- B03C3/76—Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact
- B03C3/763—Electricity supply or control systems therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Electrostatic Separation (AREA)
Abstract
The invention discloses an online ash deposition thickness measuring device and an electric dust collector control method, wherein the electric dust collector control method comprises the following steps: s1, obtaining the thickness of a dust layer on an anode plate, comparing the thickness with a preset thickness value, and entering the next step when the thickness of the dust layer is larger than the preset value; s2, obtaining an operation value of the secondary voltage, comparing the operation value with the operation value of the secondary voltage subjected to dust removal by rapping last time, and entering the next step when the variation value is larger than a preset voltage value; s3, obtaining the operation value of the secondary current, comparing the operation value with the operation value of the secondary current after the dust is removed by rapping last time, and generating a rapping dust-removing signal when the variation value is larger than a preset current value. The method can effectively avoid secondary dust raising caused by the rapping dust of the electric dust collector, improve the operation efficiency of equipment, improve the corona discharge efficiency of different electric fields of the electric dust collector, effectively reduce the power consumption and avoid the problem that the dust cannot be effectively cleaned due to large dust deposition thickness caused by too late time of rapping dust.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of flue gas pollutant treatment, in particular to the technical field of an online ash deposition thickness measuring device and an electric dust collector control method.
[ background of the invention ]
The electric dust remover is the main stream equipment for treating the large-scale industrial flue gas dust, and has the advantages of simple maintenance, low cost and the like. The secondary raise dust when ash pile up thickness direct influence ash whereabouts on the anode plate when electric precipitation shakes and beats the deashing influences dust collection efficiency greatly, and there is following defect in the mode that current electrostatic precipitator control was shaken and is beaten:
1. because the dust properties are different, the speed of dust adsorbed to the surface of the anode plate is different, the timing of vibration for ash removal cannot be accurately controlled, and the vibration time interval can only be set manually, so that the dust removal efficiency of the electric dust remover is low, and the interval time of vibration is difficult to determine by the conventional electric dust remover, so that the dust removal efficiency cannot be efficiently exerted.
2. When the rapping interval time is short, the dust layer can not be effectively agglomerated to form a cake shape, and the cake shape is rapped to strip the anode plate, and the dust is broken by the air flow again when falling to form secondary dust raising, so that the dust emission interval exceeds the standard.
3. When the rapping interval is long, the dust layer is condensed on the anode plate to form a cluster, the field intensity in an electric field is reduced, even back corona is caused to cause that the dust in the flue gas cannot be charged, one section of running time of the electric dust remover cannot work effectively, the electric energy is wasted, and the dust removal efficiency is low.
[ summary of the invention ]
The invention aims to solve the problems in the prior art and provides an online ash deposition thickness measuring device and an electric dust collector control method.
In order to achieve the aim, the invention provides a control method of an electric dust collector, which comprises the following steps:
s1, obtaining the thickness of a dust layer on an anode plate, comparing the thickness with a preset thickness value, and entering the next step when the thickness of the dust layer is larger than the preset value;
s2, obtaining an operation value of the secondary voltage, comparing the operation value with the operation value of the secondary voltage obtained after the ash removal by rapping last time, and entering the next step when the variation value is larger than a preset voltage value;
s3, obtaining the operation value of the secondary current, comparing the operation value with the operation value of the secondary current after the ash removal by rapping last time, and generating a rapping ash removal signal when the variation value is larger than a preset current value.
Preferably, the rapping timings of the electric fields of the electric dust collector are different, the rapping timings of the anode plates of different electric fields inversely calculate the dust specific resistance according to the secondary current and the secondary voltage of the electric field, and the preset thickness value of the dust layer of each electric field is set according to the specific resistance.
Preferably, in step S1, the preset thickness value is set by: and measuring the online specific resistance of the dust according to the thickness of the dust layer, the secondary current and the secondary voltage, and setting a preset thickness value of the dust layer according to the online specific resistance range of the dust.
Preferably, when the dust on-line specific resistance value is 10 8 -10 10 When the thickness is omega cm, the preset thickness value is 2cm-3 cm; when the online specific resistance value of the dust is 10 10 -10 11 When the thickness is omega cm, the preset thickness value is 1.2cm-2 cm; when the online specific resistance value of the dust is 10 11 -10 13 The preset thickness value is 0.8cm-1.2cm when the omega cm is used.
Preferably, the dust on-line specific resistance value calculation formula:
in formula (1): rho R Is an on-line specific resistance with the unit of ohm centimeter; a is the area of the anode plate measured in square centimeter; v is a secondary voltage value and has a unit of volt; h is the thickness of the dust layer and the unit is centimeter; i is the secondary current value in amperes.
Preferably, each electric field of the electric dust collector is provided with at least one measuring anode plate and is provided with a weight and current measuring device, and the weight and current measuring device comprises a current sensor and a weight sensor which are used for detecting the current on the measuring anode plate and the weight of the current.
Preferably, the dust layer thickness of each electric field of the electric dust collector is obtained by reversely calculating the dust thickness according to the dust weight measured by the weight sensor, and the running value of the secondary current of each electric field of the electric dust collector is measured by the current sensor.
Preferably, the operation value of the secondary voltage and the operation value of the secondary current are obtained by obtaining continuous fixed interval time sampling values, calculating to obtain a slope, and setting the secondary voltage value or the secondary current as a corresponding operation value when the slope is lower than a slope set value.
The invention also provides an online measuring device for the thickness of the deposited dust, which comprises a weight and current measuring device, a measuring anode plate, a grounding device and a high-voltage power supply, the grounding device is connected with the anode frame of the electric dust collector and is separately arranged with the high-voltage power supply of the electric dust collector, the measuring anode plate is arranged on an anode frame of the electric dust collector through an insulating hook, the weight and current measuring device is arranged on the insulating hook, the weight and current measuring device comprises a current sensor and a weight sensor which are respectively used for detecting the current on the measuring anode plate and the weight of the measuring anode plate, and the current sensor and the weight sensor are respectively connected with the controller through the current signal transmission shielding cable and the gravity signal transmission shielding cable.
Preferably, the overall resistance of the grounding device is not higher than 1.5 Ω.
The invention has the beneficial effects that:
1. effectively avoids secondary dust raising caused by the rapping dust removal of the electric dust collector, and improves the operation efficiency of the equipment.
2. By effectively controlling the deposition thickness of different electric fields of the electric dust remover, the corona discharge efficiency of different electric fields of the electric dust remover is improved, and the power consumption is effectively reduced.
3. The problem that the ash can not be effectively cleaned due to large ash deposition thickness caused by too late ash cleaning vibration time is avoided.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a flow chart of a method of controlling an electric precipitator in accordance with the present invention;
FIG. 2 is a schematic structural diagram of an on-line measuring device for ash deposition thickness according to the present invention;
fig. 3 is a schematic view of fig. 1 from AA.
[ detailed description ] embodiments
Referring to fig. 1, the control method of the electric dust collector of the present invention includes the following steps:
s1, obtaining the thickness of a dust layer on an anode plate, comparing the thickness with a preset thickness value, and entering the next step when the thickness of the dust layer is larger than the preset value;
s2, obtaining an operation value of the secondary voltage, comparing the operation value with the operation value of the secondary voltage obtained after the ash removal by rapping last time, and entering the next step when the variation value is larger than a preset voltage value;
s3, obtaining the operation value of the secondary current, comparing the operation value with the operation value of the secondary current after the ash removal by rapping last time, and generating a rapping ash removal signal when the variation value is larger than a preset current value.
Furthermore, the electric fields of the electric dust collector have different rapping timings, the anode plates of different electric fields reversely calculate the dust specific resistance according to the secondary current and the secondary voltage of the electric field, and the preset thickness value of the dust layer of each electric field is set according to the specific resistance.
Further, in step S1, the preset thickness value is set by: and measuring the online specific resistance of the dust according to the thickness of the dust layer, the secondary current and the secondary voltage, and setting a preset thickness value of the dust layer according to the online specific resistance range of the dust.
Further, when the on-line specific resistance value of the dust is 10 8 -10 10 When the thickness is omega cm, the preset thickness value is 2cm-3 cm; when the online specific resistance value of the dust is 10 10 -10 11 When the thickness is omega cm, the preset thickness value is 1.2cm-2 cm; when the online specific resistance value of the dust is 10 11 -10 13 The preset thickness value is 0.8cm-1.2cm when the omega cm is used.
Further, the dust online specific resistance value calculation formula is as follows:
in formula (1): rho R Is an on-line specific resistance with the unit of ohm centimeter; a is the area of the anode plate measured in square centimeter; v is a secondary voltage value and has a unit of volt; h is the thickness of the dust layer, and the thickness is inversely calculated according to the thickness of the dust measured by the weight sensor 12, and the unit is centimeter; i is the secondary current value measured in amperes by the current sensor 11.
Further, referring to fig. 2 and 3, at least one measuring anode plate 2 is arranged in each electric field (area supplied by a single high-voltage power supply 4) of the electric dust collector, and a weight and current measuring device 1 is arranged, wherein the weight and current measuring device 1 comprises a current sensor 11 and a weight sensor 12 for detecting the current on the measuring anode plate 2 and the weight of the measuring anode plate.
Further, the dust layer thickness of each electric field of the electric dust collector is obtained by back-calculating the dust thickness (the area and the dust density of the anode plate 2 are known to be measured, and the weight is divided by the area and the density is known to be thickness) by the dust weight measured by the weight sensor 12 of the online dust thickness measuring device, and the running value of the secondary current of each electric field of the electric dust collector is obtained by measuring the current sensor 11 of the online dust thickness measuring device.
Furthermore, the operation value of the secondary voltage and the operation value of the secondary current are used for obtaining a continuous fixed interval time sampling value, calculating to obtain a slope, and when the slope is lower than a slope set value, setting the secondary voltage value or the secondary current as a corresponding operation value; wherein, the secondary current slope calculation method is a secondary current difference mA measured before and after every minute, and the specific range is 0.1-0.2; the secondary voltage slope calculation method is a secondary voltage difference value kV measured before and after every minute, and the specific range is 5-10.
Further, referring to fig. 2 and 3, the weight and the secondary current of the anode plate to be measured are detected by using an online ash deposition thickness measuring device, so as to calculate the thickness of the dust layer, the online ash deposition thickness measuring device comprises a weight and current measuring device 1, a measuring anode plate 2, a grounding device 3 and a high-voltage power supply 4, the grounding device 3 is connected with an anode frame of the electric dust remover, the grounding device 3 is separately grounded with the high-voltage power supply 4 of the electric dust remover, the measuring anode plate 2 is installed on the anode frame of the electric dust remover through an insulating hook 5, the weight and current measuring device 1 is installed on the insulating hook 5, the weight and current measuring device 1 comprises a current sensor 11 and a weight sensor 12, a current signal transmission shielding cable 13, a current signal transmission shielding cable 12, and a power supply cable for respectively detecting the current on the anode plate 2 and the weight of the anode plate and the weight and the current on the anode plate 2, A gravity signal transmission shielded cable 14 and a controller 15, wherein the current sensor 11 and the weight sensor 12 are respectively connected with the controller 15 through the current signal transmission shielded cable 13 and the gravity signal transmission shielded cable 14. The overall resistance of the grounding device 3 is not higher than 1.5 omega.
Specifically, in this embodiment, every electric field (the region of single high voltage power supply) sets up one at least and measures anode plate 2 and be equipped with weight and current measuring device 1, and every anode plate upside of other anode plates hangs on the anode plate crossbeam through 2 metal hangers in the electric field, and the downside prevents through insulating pull rod spacing that the anode plate rocks, and the anode plate is electrically conductive through metal hanger and frame, rethread frame ground connection. The measuring anode plate 2 is connected with the anode frame through the weight and current measuring device 1, so that the current and the weight on the measuring anode plate 2 can be fed back to the weight and current measuring device 1. The weight signal and the current signal are measured by the weight and current measuring device 1 and fed back to the controller 15, when the control method from the step S1 to the step S3 judges that the rapping is needed, the rapping dust-cleaning device in the power supply area of the high-voltage power supply 4 is started, after one round of dust cleaning is finished (all anode plates finish the dust cleaning in staggered positions row by row), the rapping dust-cleaning device is closed, after a period of time, the rapping dust-cleaning device is started according to the signal, and a cycle is completed. The secondary voltage can be directly obtained from a high-voltage power supply, the data are conventional measurement signal data, and the conventional high-voltage power supply controller can acquire the secondary voltage data in real time.
Because the characteristics of dust collected by different electric fields are different, for example, the dust collected by a front-end electric field has large particle size, the dust collected by a rear-end electric field has small particle size and large specific resistance, so that the resistance of current passing through a dust layer is different, secondary current under the same secondary voltage is fed back to be different, and the current signals collected by a weight and current measuring device under the same dust layer thickness have different sizes, therefore, different electric fields need to calibrate a preset voltage value and a preset current value, and when the working condition of flue gas (including unit load and coal type) changes, automatic recalibration is needed.
In high-voltage electric field corona discharge, dust in the flue gas adsorbs negative charges, moves under the electric field force and adsorbs to the surface of the measurement anode plate, and the thickness of the dust layer on the surface of the measurement anode plate is gradually thickened. At a fixed inter-pole distance, the smoke between inter-pole distances in a high-voltage electric field can be conductive, the dust layer can also be conductive, and a resistance value exists, current is formed between a high-voltage power supply → the smoke between inter-pole distances → the dust layer → a measurement anode plate → a lead → a current sensor → a lead → a frame → ground, a current sensor 11 is arranged between the measurement anode plate 2 and a grounding device 3, a current signal is collected, the collected current signal is transmitted to a controller 15 through a current signal transmission shielding cable 13, and after the thickness of the dust layer is increased, the current signal is reduced along with the increase of the dust under a fixed secondary voltage, so that the thickness of the dust layer is judged through the current signal.
On the other hand, the self weight of the anode plate 2 is fixed, the anode plate 2 is hung on the frame through the single insulating hook 5 of the anode plate 2, the weight of the dust layer on the anode plate 2 is collected and measured by arranging the weight sensor 12 on the insulating hook 5, the signal of the weight sensor 12 is transmitted to the controller through the gravity signal transmission shielding cable 14, and the controller 15 calculates the thickness of the dust layer reversely, so that the collection and calculation of the thickness of the dust deposition of the anode plate are realized.
Due to the fact that certain errors exist in the two methods, for example, secondary voltage cannot be completely controlled in customization through a current signal method, so that errors exist in current signals, and the anode plate shakes due to air flow fluctuation through a weight signal method. The method improves the accuracy of measuring the thickness of the dust layer by combining two methods.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.
Claims (10)
1. A control method of an electric dust collector is characterized by comprising the following steps: the method comprises the following steps:
s1, obtaining the thickness of a dust layer on an anode plate, comparing the thickness with a preset thickness value, and entering the next step when the thickness of the dust layer is larger than the preset value;
s2, obtaining an operation value of the secondary voltage, comparing the operation value with the operation value of the secondary voltage obtained after the ash removal by rapping last time, and entering the next step when the variation value is larger than a preset voltage value;
s3, obtaining the operation value of the secondary current, comparing the operation value with the operation value of the secondary current after the ash removal by rapping last time, and generating a rapping ash removal signal when the variation value is larger than a preset current value.
2. The control method of the electric dust collector as claimed in claim 1, wherein: the electric fields of the electric dust collector have different rapping timings, the anode plates of different electric fields inversely calculate the dust specific resistance according to the secondary current and the secondary voltage of the electric field, and the preset thickness value of the dust layer of each electric field is set according to the specific resistance value.
3. The control method of the electric dust collector as claimed in claim 1 or 2, wherein: in step S1, the preset thickness value is set by: and measuring the online specific resistance of the dust according to the thickness of the dust layer, the secondary current and the secondary voltage, and setting a preset thickness value of the dust layer according to the online specific resistance range of the dust.
4. The control method of the electric dust collector as claimed in claim 3, wherein: when the online specific resistance value of the dust is 10 8 -10 10 When the thickness is omega cm, the preset thickness value is 2cm-3 cm; when the online specific resistance value of the dust is 10 10 -10 11 When omega cm, preSetting the thickness value to be 1.2cm-2 cm; when the online specific resistance value of the dust is 10 11 -10 13 The preset thickness value is 0.8cm-1.2cm when the omega cm is used.
5. The control method of the electric dust collector as claimed in claim 3, wherein: the dust on-line specific resistance value calculation formula is as follows:
in formula (1): rho R Is an on-line specific resistance with the unit of ohm centimeter; a is the area of the anode plate measured in square centimeter; v is a secondary voltage value and has a unit of volt; h is the thickness of the dust layer and the unit is centimeter; i is the secondary current value in amperes.
6. The control method of the electric dust collector as claimed in claim 2, wherein: each electric field of the electric dust collector is at least provided with one measuring anode plate (2) and is provided with a weight and current measuring device (1), and the weight and current measuring device (1) comprises a current sensor (11) and a weight sensor (12) which are used for detecting the current and the weight of the current on the measuring anode plate (2).
7. The control method of the electric dust collector as claimed in claim 6, wherein: the dust weight of the dust layer thickness of each electric field of the electric dust collector is measured by a weight sensor (12) to calculate the dust thickness, and the running value of the secondary current of each electric field of the electric dust collector is measured by a current sensor (11).
8. The control method of the electric dust remover as claimed in claim 1, wherein: and when the slope is lower than a slope set value, setting the secondary voltage value or the secondary current as a corresponding operating value.
9. The utility model provides an online measuring device of deposition thickness which characterized in that: including weight and current measurement device (1), measurement anode plate (2), earthing device (3), high voltage power supply (4), earthing device (3) are connected with the positive pole frame of electrostatic precipitator, earthing device (3) separately set up with high voltage power supply (4) ground connection of electrostatic precipitator, it installs on the positive pole frame of electrostatic precipitator through insulating couple (5) to measure anode plate (2), weight and current measurement device (1) are installed on insulating couple (5), weight and current measurement device (1) are including being used for detecting respectively current sensor (11) and weight sensor (12) with and weight on measuring anode plate (2) to and current signal conveying shielded cable (13), gravity signal conveying shielded cable (14), controller (15), current sensor (11) and weight sensor (12) are respectively through current signal conveying shielded cable (13), The gravity signal transmission shielded cable (14) is connected with the controller (15).
10. The on-line measuring device of ash deposition thickness according to claim 9, wherein: the overall resistance of the grounding device (3) is not higher than 1.5 omega.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210487772.7A CN114904658A (en) | 2022-05-06 | 2022-05-06 | On-line ash deposition thickness measuring device and electric dust collector control method |
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| CN202210487772.7A CN114904658A (en) | 2022-05-06 | 2022-05-06 | On-line ash deposition thickness measuring device and electric dust collector control method |
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-
2022
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| Title |
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