CN105032618A - Control method and system of electrostatic dust remover used for power plant - Google Patents
Control method and system of electrostatic dust remover used for power plant Download PDFInfo
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- CN105032618A CN105032618A CN201510310270.7A CN201510310270A CN105032618A CN 105032618 A CN105032618 A CN 105032618A CN 201510310270 A CN201510310270 A CN 201510310270A CN 105032618 A CN105032618 A CN 105032618A
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Abstract
The invention discloses a control method and system of an electrostatic dust remover used for a power plant. According to the method, the dust removal effect of a vibrator in the electrostatic dust remover is improved through the following measures that the vibration frequency of the vibrator is controlled between 1.5 Hz and 3 Hz, during vibration, an electric field power supply is cut off or the voltage of the electric field power supply is lowered, and the vibration mode that matrix vibration and grouped vibration are combined is adopted. The control method and system of the electrostatic dust remover used for the power plant are easy to implement and good in dust removal effect.
Description
Technical field
The present invention relates to control method and the system of a kind of thermal power plant electrostatic precipitator.
Background technology
The employing Thermal generation unit that thermal power generation is long, dedusting method generally adopts electrostatic precipitator, and electrostatic precipitator adopts electromagnetic rapping system.Electrostatic precipitator normal operation, but electric cleaner outlet dust concentration is 25 ~ 30mg/Nm
3, but because smoke dust discharge concentration is close to the high limit of country's permission discharge, there is larger environment hidden danger.
In addition, the inner dust stratification of electric field often causes tripping operation, and mainly because as-fired coal is mostly local lambskin, ash (exceedes design load 38%) more than 40%, and dust specific resistance can reach 9.56 × 10
12Ω cm.High resistivity dust can bring be difficult to trapping, dust adhesion is high, form the adverse effects such as inverse corona in electric field inside.Along with running time increases, the inner dust stratification of electric field increases gradually, and die opening reduces.One, after two electric fields change high frequency electric source into by power frequency supply, the high resistivity dust trapped in operation is more comparatively before, and the dust stratification thus on one, two Electrodes, polar curve increases, and frequently causes electric field overcurrent protection to trip.
So must be optimized further, to outlet dust concentration is down to 25 ~ 30mg/Nm the combustion adjustment of electric cleaner and maintenance
3below, therefore, the control method and the system that design a kind of thermal power plant electrostatic precipitator is necessary.
Summary of the invention
Technical problem to be solved by this invention is to provide control method and the system of a kind of thermal power plant electrostatic precipitator, and control method and the system of this thermal power plant's electrostatic precipitator are easy to implement, good dedusting effect.
The technical solution of invention is as follows:
A control method for thermal power plant's electrostatic precipitator, adopts following measures to improve the dust removing effects of vibrator in electrostatic precipitator:
(1) the rapping FREQUENCY CONTROL of vibrator is at 1.5 ~ 3Hz;
(2) voltage of electric field power supply or reduction electric field power supply is cut off during rapping to zero volt;
(3) the rapping pattern that matrix rapping and grouping rapping combine is adopted;
Described matrix rapping refers to and is numbered in order by all vibrators by controller, then by this numbering successively, each vibrator of loop start implements rapping dedusting;
Described grouping rapping, part or all of vibrator in all vibrators is divided into many groups, and [first time first starts first group, then starts second group to start each group of vibrator enforcement rapping dedusting successively by controller,, last group restarts first group after having beaten];
Described matrix rapping and grouping rapping combine and refer to that matrix rapping and grouping rapping hocket.
The rapping frequency of vibrator adopts 2Hz.
Cutting off electric field power supply during rapping refers in rapping process, and electric field power supply was stopped transport 10 minutes every 45 minutes, circulated successively.
In the rapping pattern that described matrix rapping and grouping rapping combine, adopt packet mode to run 30 minutes in one day, all the other time adopts matrix rapping pattern.
Controlling electric field operation secondary voltage is 30 ~ 40KV, and the secondary current that electric field runs is 260 ~ 400mA.The current limitation percentage value of adjustment electric field, until secondary voltage 30 ~ 40KV, secondary current 260 ~ 400mA.Concrete adjustment mode is prior art.
Controlling electric field operation secondary voltage is 35KV, and the secondary current that electric field runs is 300mA.
The control system of described thermal power plant's electrostatic precipitator, is characterized in that, comprises controller, vibrator power supply circuits, rapping array and electric field power supply circuits;
Described electric field power supply circuits are the power supply that electrostatic precipitator is provided for being formed electric field;
Vibrator power supply circuits are bridge rectifier, the interchange side joint alternating current 220V power supply of bridge rectifier; The DC side of bridge rectifier connects described rapping array through 2 fly-wheel diodes;
Rapping array comprises the longitudinal control line of M bar crosswise joint line and N bar [horizontal and vertical to be in logic horizontal and vertical, and be not understood to practical wiring direction]; M and N is the integer being greater than 2;
The negative pole short circuit of 2 fly-wheel diodes, the positive pole of 2 fly-wheel diodes connects two outputs of bridge rectifier outlet side respectively;
One end of M bar crosswise joint line is all shorted together, and is connected with the negative pole of 2 fly-wheel diodes; All be connected to a switch between each crosswise joint line and negative pole of 2 fly-wheel diodes, be designated as KRi, i=0,1,2 ..., M-1;
The shorted on one end of the longitudinal control line of N bar, and is connected with the negative pole of the negative feeder ear [also can hold with being called] of bridge rectifier outlet side together; All be serially connected with a switch between each crosswise joint line and described negative feeder ear, be designated as KCi, i=0,1,2 ..., N-1;
Controller has M+N the IO port for gauge tap KRi and the KCi section of leading to; Wherein M IO port is used for gauge tap KRi, and N number of IO port is used for gauge tap KCi.
All be connected to a rapping module between each crosswise joint line and longitudinal control line, form the rapping array be made up of M*N rapping module; Each rapping module is in series by a vibrator and an isolating diode.
Described M and N is 16.
A control system for thermal power plant's electrostatic precipitator, comprises controller, vibrator power supply circuits, rapping array and electric field power supply circuits;
Described electric field power supply circuits are the power supply that electrostatic precipitator is provided for being formed electric field;
Vibrator power supply circuits are bridge rectifier, the interchange side joint alternating current 220V power supply of bridge rectifier; The DC side of bridge rectifier connects described rapping array through 2 fly-wheel diodes;
Rapping array comprises the longitudinal control line of M bar crosswise joint line and N bar [horizontal and vertical to be in logic horizontal and vertical, and be not understood to practical wiring direction]; M and N is the integer being greater than 2;
The negative pole short circuit of 2 fly-wheel diodes, the positive pole of 2 fly-wheel diodes connects two outputs of bridge rectifier outlet side respectively;
One end of M bar crosswise joint line is all shorted together, and is connected with the negative pole of 2 fly-wheel diodes; All be connected to a switch between each crosswise joint line and negative pole of 2 fly-wheel diodes, be designated as KRi, i=0,1,2 ..., M-1;
The shorted on one end of the longitudinal control line of N bar, and is connected with the negative pole of the negative feeder ear [also can hold with being called] of bridge rectifier outlet side together; All be serially connected with a switch between each crosswise joint line and described negative feeder ear, be designated as KCi, i=0,1,2 ..., N-1;
Controller has M+N the IO port for gauge tap KRi and the KCi section of leading to;
All be connected to a rapping module between each crosswise joint line and longitudinal control line, form the rapping array be made up of M*N rapping module; Each rapping module is in series by a vibrator and an isolating diode;
The control method of aforesaid thermal power plant electrostatic precipitator is adopted to implement to control to thermal power plant's electrostatic precipitator.
Described M and N is 16.
Beneficial effect:
The control method of thermal power plant of the present invention electrostatic precipitator and system, can (1), optimize electromagnetic rapping system cloud gray model, 2, adjustment electric field operational factor, set up electric cleaner optimal working point, reach energy-conservation two excellent with discharge, improve ash-removal effect; Effectively can reduce electric cleaner outlet dust concentration, decrease energy input.The invention solves the contradiction of Electric Scrubber Efficiency and energy consumption, achieve the object reducing soot emissions and power consumption.
Accompanying drawing explanation
Fig. 1 is the first VA characteristic curve schematic diagram;
Fig. 2 is the second VA characteristic curve schematic diagram;
Fig. 3 is electromagnetic rapping system wiring schematic diagram.
Detailed description of the invention
Below with reference to the drawings and specific embodiments, the present invention is described in further details:
Embodiment 1:
Optimize electromagnetic rapping system cloud gray model, improve ash-removal effect
The efficiency of dust collection of electric cleaner depends primarily on the size of electric-field intensity, and corona voltage between electric-field intensity and electrode and current related, relation between corona voltage and corona current is called C-V characteristic by us, according to the curve map of drafting be called VA characteristic curve, it be weigh that electric cleaner is installed, the important evidence of repair quality and operating condition.
After Retrofit on electrostatic precipitator completion, namely no-load test is carried out to each electric field, draw cold conditions VA characteristic curve, the curve data that contrast producer provides, for the examination of improvement project provides foundation, ensure that the original state that electric cleaner is good.
Follow the tracks of by having carried out 24 hours to unit electric cleaner, copy data, draw hot VA characteristic curve.Through great efforts, have found two kinds of VA characteristic curves before electric field tripping operation, as shown in " Fig. 1 ", " Fig. 2 ".
In " Fig. 1 ", VA characteristic curve is to right translation, i.e. same electrical pressure, corona current reduces comparatively fifty-fifty, and this is generally caused by discharge failure, and that is inner dust stratification is more causes corona blocking for electric field.In " Fig. 2 ", electric field VA characteristic curve rotates to the right, and under same voltage, corona current significantly reduces, and analyzes accordingly, and electric field inside there occurs back corona phenomenon.The generation of corona blocking and inverse corona, basic reason is that high resistivity dust causes dust stratification in positive plate or cathode line too much.Eliminate this problem, must be started with by vibrated system.First analyze electromagnetic rapping system wiring principle, see " Fig. 3 ".
In native system, vibrator connects into matrix form (rapping of each room forms a matrix), any moment, and in matrix, each only permission vibrator puts into operation.Meanwhile, the internal height due to vibrator is fixing, therefore, strengthen rapping, the method strengthened rapping frequency, adjust the rapping method of operation can only be taked to realize, solution:
A) reduce the interval time of vibrator to strengthen rapping frequency, be reduced to 0.5s by the former 1s established.Like this, within the identical time, the rapping number of times of every platform vibrator all doubles, and rapping intensity is improved.
B) adjust the rapping method of operation, under field operation state, due to the effect of electrostatic force, the dust adhesion performance on pole plate, polar curve is very strong, is difficult to thoroughly be shaken.In order to reduce the absorption affinity of dust, in the control software design that producer provides, embedded in rapping off power logic, namely in same electric field, as long as there is a vibrator to enter rapping state, namely stopping powering to electric field or reducing secondary voltage.Till, carried out secondary reinforcement to rapping off power logic, high-frequency electric field, every stoppage in transit in 45 minutes 10 minutes (time adjustable), circulates successively.After electric field is stopped transport, the dust adhesion ability caused because of electrostatic interaction obviously reduces, and ramping effect is strengthened greatly, and completely avoid the problem that the inner dust stratification of electric field causes secondary current to reduce gradually, exerting oneself of electric field remains at optimum state.
C) take matrix and the rapping mode of dividing into groups to combine, be main in a matrix fashion, middle class in a kindergarten every day is adjusted to packet mode and runs 30 minutes.Like this, the advantage of quick rapping under namely having played matrix-style, make again cathode frame obtain abundant rapping, ash-removal effect is good.
Practice shows, after the optimizing operation to electromagnetic rapping system, electric field is inner substantially without fouling phenomenon.
Other Optimized Measures is adjustment electric field operational factor, sets up electric cleaner optimal working point, reaches energy-conservation two excellent with discharge.
For 3 600MW Thermal generation unit, dedusting method adopts electrostatic precipitator, and 2BE486/2-5 two rooms horizontal type electric dust collector that a clean environmental protection of Fujian dragon is produced installed by every platform stove.
After Retrofit on electrostatic precipitator completion, in trial run, in order to ensure that soot emissions are up to standard, take electric field high parameter to run, the current limitation of electric field runs more than 80%, but shows the data that return according to desulfurization entrance CEMS, and high electric pulse field parameter does not bring minimum emission effect.Meanwhile, because electric field running current is large, energy consumption also improves gradually.In order to find efficiency of dust collection and energy-conservation best joint, carry out a large amount of tests.
First, under have collected each load point of boiler, the former flue gas flue dust of desulfurization entrance, desulfurization outlet neat stress flue dust and chimney neat stress flue dust data during different current limitation, with electric pulse field parameter during boiler load 600MW and soot emissions data instance, see " table 1 ":
Table 1
As shown in " table 1 ", electric field runs secondary voltage 30 ~ 40KV, and during secondary current 260 ~ 400mA, electric cleaner outlet soot emissions are minimum, and energy consumption is minimum.In order to the accuracy of demonstration test data, be adjusted to 35KV, secondary current 300mA by unified for the operation secondary of electric field pressure, three electric cleaner outlet dust concentration measured values are all at 12mg/Nm
3below, 50mg/Nm is reduced before higher-frequency transformation
3, comparatively reduce 16.5mg/Nm before optimizing operation
3, by exhaust gas volumn 1800000Nm
3/ h calculates, and every day can reduce soot emissions 712Kg, and DCO data are shown in " table 2 ":
Table 2
Because electric pulse field parameter has obvious reduction comparatively before, so consumption rate declines to a great extent, " table 3 " is the forward and backward electric quantity data contrast of Retrofit on electrostatic precipitator:
Table 3
According to " table 3 ", carry out high frequency transformation and after optimizing operation at electric cleaner, average day power consumption reduce 10487KWh, electric precipitation station service power consumption rate declines 45%.
2014, certain #1 unit electric cleaner is accumulative ran 2965h, and economize on electricity 1294490KWh, reduces soot emissions total amount 87946Kg; #2 unit electric cleaner runs 3361h altogether, and economize on electricity 1235027KWh, reduces soot emissions total amount 99698Kg; #3 unit electric cleaner is accumulative runs 7183h, and economize on electricity 3638100KWh, reduces soot emissions total amount 207147Kg.Utilize hour 5000h to calculate according to unit annual, unit can reduce dedusting station-service electricity 2180000KWh, dust emission 148T every year, significantly reduces the pollution to environment, achieves good economic benefit and social benefit.After the transformation of electric cleaner high frequency electric source, run by double optimization, successfully have chosen optimal operating condition point, effectively improve the operational efficiency of electric cleaner, reduce outlet soot emissions, accomplish energy-conservation two up to standard with environmental protection.
Claims (10)
1. a control method for thermal power plant's electrostatic precipitator, is characterized in that, adopts following measures to improve the dust removing effects of vibrator in electrostatic precipitator:
(1) the rapping FREQUENCY CONTROL of vibrator is at 1.5 ~ 3Hz;
(2) voltage of electric field power supply or reduction electric field power supply is cut off during rapping to zero volt;
(3) the rapping pattern that matrix rapping and grouping rapping combine is adopted;
Described matrix rapping refers to and is numbered in order by all vibrators by controller, then by this numbering successively, each vibrator of loop start implements rapping dedusting;
Described grouping rapping, is divided into many groups by the part or all of vibrator in all vibrators, starts each group of vibrator successively implement rapping dedusting by controller;
Described matrix rapping and grouping rapping combine and refer to that matrix rapping and grouping rapping hocket.
2. the control method of thermal power plant according to claim 1 electrostatic precipitator, is characterized in that, the rapping frequency of vibrator adopts 2Hz.
3. the control method of thermal power plant according to claim 1 electrostatic precipitator, is characterized in that, cut off electric field power supply during rapping and refer in rapping process, electric field power supply was stopped transport 10 minutes every 45 minutes, circulated successively.
4. the control method of thermal power plant according to claim 1 electrostatic precipitator, is characterized in that, in the rapping pattern that described matrix rapping and grouping rapping combine, adopt packet mode to run 30 minutes in one day, all the other time adopts matrix rapping pattern.
5. the control method of the thermal power plant's electrostatic precipitator according to any one of claim 1-4, is characterized in that, controlling electric field operation secondary voltage is 30 ~ 40KV, and the secondary current that electric field runs is 260 ~ 400mA.
6. the control method of thermal power plant according to claim 5 electrostatic precipitator, is characterized in that, controlling electric field operation secondary voltage is 35KV, and the secondary current that electric field runs is 300mA.
7. the control method of thermal power plant according to claim 5 electrostatic precipitator, it is characterized in that, the control system of described thermal power plant's electrostatic precipitator, is characterized in that, comprises controller, vibrator power supply circuits, rapping array and electric field power supply circuits;
Described electric field power supply circuits are the power supply that electrostatic precipitator is provided for being formed electric field;
Vibrator power supply circuits are bridge rectifier, the interchange side joint alternating current 220V power supply of bridge rectifier; The DC side of bridge rectifier connects described rapping array through 2 fly-wheel diodes;
Rapping array comprises M bar crosswise joint line and the longitudinal control line of N bar; M and N is the integer being greater than 2;
The negative pole short circuit of 2 fly-wheel diodes, the positive pole of 2 fly-wheel diodes connects two outputs of bridge rectifier outlet side respectively;
One end of M bar crosswise joint line is all shorted together, and is connected with the negative pole of 2 fly-wheel diodes; All be connected to a switch between each crosswise joint line and negative pole of 2 fly-wheel diodes, be designated as KRi, i=0,1,2 ..., M-1;
The shorted on one end of the longitudinal control line of N bar, and is connected with the negative pole of the negative feeder ear of bridge rectifier outlet side together; All be serially connected with a switch between each crosswise joint line and described negative feeder ear, be designated as KCi, i=0,1,2 ..., N-1;
Controller has M+N the IO port for gauge tap KRi and the KCi section of leading to;
All be connected to a rapping module between each crosswise joint line and longitudinal control line, form the rapping array be made up of M*N rapping module; Each rapping module is in series by a vibrator and an isolating diode.
8. the control system of thermal power plant according to claim 7 electrostatic precipitator, is characterized in that, described M and N is 16.
9. a control system for thermal power plant's electrostatic precipitator, is characterized in that, comprises controller, vibrator power supply circuits, rapping array and electric field power supply circuits;
Described electric field power supply circuits are the power supply that electrostatic precipitator is provided for being formed electric field;
Vibrator power supply circuits are bridge rectifier, the interchange side joint alternating current 220V power supply of bridge rectifier; The DC side of bridge rectifier connects described rapping array through 2 fly-wheel diodes;
Rapping array comprises M bar crosswise joint line and the longitudinal control line of N bar; M and N is the integer being greater than 2;
The negative pole short circuit of 2 fly-wheel diodes, the positive pole of 2 fly-wheel diodes connects two outputs of bridge rectifier outlet side respectively;
One end of M bar crosswise joint line is all shorted together, and is connected with the negative pole of 2 fly-wheel diodes; All be connected to a switch between each crosswise joint line and negative pole of 2 fly-wheel diodes, be designated as KRi, i=0,1,2 ..., M-1;
The shorted on one end of the longitudinal control line of N bar, and is connected with the negative pole of the negative feeder ear of bridge rectifier outlet side together; All be serially connected with a switch between each crosswise joint line and described negative feeder ear, be designated as KCi, i=0,1,2 ..., N-1;
Controller has M+N the IO port for gauge tap KRi and the KCi section of leading to;
All be connected to a rapping module between each crosswise joint line and longitudinal control line, form the rapping array be made up of M*N rapping module; Each rapping module is in series by a vibrator and an isolating diode;
The control method of thermal power plant according to claim 5 electrostatic precipitator is adopted to implement to control to thermal power plant's electrostatic precipitator.
10. the control system of thermal power plant according to claim 9 electrostatic precipitator, is characterized in that, described M and N is 16.
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Cited By (3)
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| CN106583049A (en) * | 2017-01-06 | 2017-04-26 | 浙江浙能嘉华发电有限公司 | Control method for preventing electric dust removal caking blockage |
| CN109967258A (en) * | 2019-04-25 | 2019-07-05 | 芜湖新兴铸管有限责任公司 | Sintering machine head end electric precipitator ash-discharging device |
| CN110597175A (en) * | 2019-10-22 | 2019-12-20 | 紫金铜业有限公司 | Waste heat boiler vibration control system and method |
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