CN202290307U - High voltage intermediate frequency (IF) power supply for electrostatic precipitator - Google Patents
High voltage intermediate frequency (IF) power supply for electrostatic precipitator Download PDFInfo
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- CN202290307U CN202290307U CN2011203963008U CN201120396300U CN202290307U CN 202290307 U CN202290307 U CN 202290307U CN 2011203963008 U CN2011203963008 U CN 2011203963008U CN 201120396300 U CN201120396300 U CN 201120396300U CN 202290307 U CN202290307 U CN 202290307U
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Abstract
The utility model relates to a high voltage intermediate frequency (IF) power supply for an electrostatic precipitator. The high voltage IF power supply for the electrostatic precipitator comprises a rectifier unit, an inverter, a high voltage rectifier transformer and a controller, wherein the rectifier unit is used for rectifying input three-phase 380V power frequency 50Hz AC (alternating current) to DC (direct current), and then carrying out filter output, and the inverter is used for inverting the filtered DC into two-phase IF AC; the high voltage rectifier transformer is used for boosting and rectifying the two-phase IF AC for supplying power to the electrostatic precipitator, and the controller is used for controlling the frequency size of the IF AC inverted by the inverter. The high voltage IF power supply solves the technical problems that the power supply of the electrostatic precipitator in the prior art is a low frequency (power frequency) or high frequency power supply, the response time is slow, and the collection efficiency is low when the power supply adopts the low frequency power supply; and the cost is high, a high-power device technology is immature, the waste of resources is caused by replacing corresponding equipment in transformation of an old precipitator when the power supply adopts the high frequency power supply. According to the high voltage IF power supply for the electrostatic precipitator, an IF power supply is used to supply power, the response time is prolonged, the collection efficiency is improved, and the equipment does not need to be replaced.
Description
Technical field
The utility model relates to a kind of power supply, and specifically a kind of electrostatic precipitator is with high pressure intermediate frequency power supply and control method thereof.
Background technology
Electrostatic precipitator (electrostatic precipitator is called for short ESP) is that a kind of highfield that utilizes makes dust particles, and the device that under the effect of electrostatic field, grit is separated, captures.The operation principle of electrostatic precipitator is to utilize high voltage electric field to make flue gas generation ionization; Produce a large amount of electronics and ion; Under the effect of electric field force, move to the two poles of the earth, the dust granules of in moving process, running in the air-flow makes it charged, and charged dust moves to opposite polarity pole plate or polar curve with flow separation under the electric field force effect; Be adsorbed on pole plate or the polar curve by electrostatic force when charged dust arrives pole plate or polar curve, make gas cleaning thereby make dust fall into ash bucket through rapping apparatus.
The efficiency of dust collection of electrostatic precipitator depends on the average supply voltage that is applied to electric field and the height of electric current.At present, the used power supply of electrostatic precipitator has three kinds, introduces respectively below:
First kind: the input power supply is two phase 380V power frequency 50Hz, and the power supply that is input to high-voltage rectifying transformer is two phase 0-380V power frequency 50Hz power supplys.The shortcoming of this power supply is that power frequency is supplied power, silicon-controlled voltage regulation mode owing to adopt, when deduster electric field generation flashover; The dynamic response time of this power supply is slow partially; About about 10ms, the high-voltage rectifying transformer secondary voltage falls amplitude and reaches 35-40%, influences the efficiency of dust collection of deduster.And the power factor that should import power supply is lower, generally has only about 0.5.
Second kind: the input power supply is three-phase 380V power frequency 50Hz, and the power supply that is input to high-voltage rectifying transformer is a three-phase 0-380V power frequency 50Hz power supply.The shortcoming of this power supply is still to adopt power frequency power supply, silicon-controlled voltage regulation mode, when deduster electric field generation flashover; The dynamic response time of this power supply is still slow partially; About about 3.3ms, the high-voltage rectifying transformer secondary voltage falls amplitude and reaches 20-30%, influences the efficiency of dust collection of deduster.And equipment volume is huge, and cost is higher.In addition, adopt this power supply transformation to have deduster now, must change existing precipitator energisation equipment, cause the wasting of resources.
The third: the input power supply is three-phase 380V power frequency 50Hz, and the power supply that is input to high-voltage rectifying transformer is two phase 0-380V high frequencies, 20,000 Hz power supplys.As disclosing the high-frequency and high-voltage power supply that a kind of electric precipitation is used among the Chinese patent document CN201399383Y, form by high-frequency and high-voltage silicon stack, step-up transformer, microcomputerized controller, fuel tank and switch board with constant-current characteristics.Though this power supply can be improved the efficiency of dust collection of electrostatic precipitator,, cause that cost is generally higher, reliability is low owing to reasons such as the reason of technical reason, device itself and production technologies.And the power of such power supply is less than normal, ripe at present deduster high frequency electric source, and peak power is merely 72KV/1.2A, is difficult to satisfy the power reguirements of deduster.In addition, adopt this power supply transformation to have deduster now, must change existing precipitator energisation equipment, cause the wasting of resources.
Can know that by above analysis there is the problem that dynamic response time is slow partially, secondary voltage falls amplitude height (20%-40%) in the power supply that electrostatic precipitator is used, the technical problem that efficiency of dust collection is low during as power frequency (50Hz); The power supply that electrostatic precipitation uses is during as high frequency, though improved efficiency of dust collection, owing to do not match with the equipment of old deduster power supply, needs all to change new equipments, can not be used for the transformation of former old deduster power supply, causes the wasting of resources.
The utility model content
For this reason; The utility model technical problem to be solved is that the power supply of static electricity dust catcher power supply input high-voltage rectifying transformer is low frequency (power frequency) or high frequency; There is the problem that the response time is slow, efficiency of dust collection is low during low frequency; There is the problem that cost is high, needs replacing relevant device causes the wasting of resources during high frequency; Thereby propose a kind of use intermediate frequency power supply high-voltage rectifying transformer is supplied power, improved response time and efficiency of dust collection and need not more a kind of electrostatic precipitator of exchange device and used the high pressure intermediate frequency power supply.
For solving the problems of the technologies described above, the described electrostatic precipitator of the utility model is used the high pressure intermediate frequency power supply, comprising:
Rectification unit comprises rectifier and wave filter, and said rectifier is a direct current with the AC rectification of the three-phase 380V power frequency 50Hz of input, and said direct current is exported behind said filter filtering again;
Inverter is with the said filtered dc inverter medium frequency alternating current that is two phases;
High-voltage rectifying transformer is used for being the electrostatic precipitator power supply after the midfrequent ac electric boost rectification of said two phases;
Also comprise controller; The frequency of the medium frequency alternating current after the inversion of said controller control inverter size comprises that frequency selects converting unit, obtains the said optimal frequency of the medium frequency alternating current after the said inverter inversion; Be said high-voltage rectifying transformer power supply, thereby be the electrostatic precipitator power supply.
The frequency range of said medium frequency alternating current is 100Hz-1000Hz
Be provided with the IGBT switching tube in the said inverter.
Output at said high-voltage rectifying transformer is provided with voltage acquisition module and current acquisition module, and said voltage acquisition module and current acquisition module send to said controller with detected voltage and current information.
Also comprise human-computer interaction interface, can set the frequency of the medium frequency alternating current after the said inversion through this human-computer interaction interface.
Said inverter is two phase full-bridge inverters.
Said rectifier is the three phase full wave rectification bridge of being made up of commutation diode.
The technique scheme of the utility model is compared prior art and is had the following advantages,
(1) electrostatic precipitator of the utility model is used the high pressure intermediate frequency power supply, comprises rectification unit, inverter, high-voltage rectifying transformer and controller, and said rectification unit comprises rectifier and wave filter; The frequency size of the medium frequency alternating current after the inversion of said controller control inverter, said controller is provided with a plurality of frequency values through its frequency translation unit in selectable frequency range, measure the output current and the voltage of the high-voltage rectifying transformer that obtains under each frequency values; Calculate the product of said current value and magnitude of voltage, the frequency size of the medium frequency alternating current when selecting product maximum after the inverter inversion of correspondence is an optimal frequency, and the medium frequency alternating current after the said inverter inversion is provided with optimal frequency for this reason; Be said high-tension transformer power supply, thereby, obtain intermediate frequency power supply in this way for the electrostatic precipitator power supply; Using intermediate frequency power supply is said electrostatic precipitator power supply; Compare with the power frequency supply power supply, can improve its operating efficiency greatly, inverter output intermediate frequency power supply is given high-voltage rectifying transformer; Can power factor be brought up to 0.95; Through using intermediate frequency power supply, can reduce the sudden change of high-voltage rectifying transformer secondary voltage, improve the average voltage of electric field and the ratio of crest voltage; Improve the voltage-to-current curve of electrostatic precipitator; The use of intermediate frequency power supply can reduce falling of high-voltage rectifying transformer secondary voltage, only falls 5%-10%, so the mean value of high-voltage rectifying transformer secondary voltage will increase greatly; The increase of secondary voltage will cause the increase of secondary current, improve the efficiency of dust collection of electrostatic precipitator; In addition; Owing to be directed against the operating frequency range that type being provided with of high-voltage rectifying transformer can be selected; Obtain the optimal frequency in this scope according to actual condition, make said deduster be operated under this optimal frequency then, obtain best efficiency of dust collection with power supply; And through controller and frequency translation unit thereof; Make the high-voltage rectifying transformer of controller and dissimilar impedances match, when transforming old cleaner, need not change other equipment, practiced thrift resource greatly; Improved the operating efficiency of said electrostatic precipitator, efficiently solve in the prior art powerful device technology immature, need change the technical problem that relevant device causes the wasting of resources when being used for old cleaner reform.
(2) electrostatic precipitator of the utility model is used the high pressure intermediate frequency power supply, and when said high-voltage rectifying transformer was the high resistant impedance, said selectable operating frequency range was 100Hz-400Hz; When said high-voltage rectifying transformer was middle resistance impedance, said selectable operating frequency range was 200Hz-600Hz; When said high-voltage rectifying transformer was the low-resistance impedance, said selectable operating frequency range was 300Hz-1000Hz, the frequency of the medium frequency alternating current that can select according to the type setting of high-voltage rectifying transformer; Owing to receive the restriction of high-voltage rectifying transformer,, need design according to its original equipment in order to transform this power supply; Like this; Improved the scope of application of controller, also enlarged The reconstruction scope, obtained suitable reform of middle frequency power mode through using controller to various old power supplys; Promptly improve the operating efficiency of old power supply, also improved usage ratio of equipment.
(3) electrostatic precipitator of the utility model is used the high pressure intermediate frequency power supply; Be provided with the IGBT switching tube in the said inverter; Being different from SCR control must could effectively turn-off when the alternating voltage waveform zero crossing; The inverter that is provided with the IGBT switching tube can realize turn-offing fast (microsecond level) in the random time section of alternating voltage waveform, this means falling of secondary voltage when having reduced electrostatic precipitator flashing and flashover widely, thereby reduces the electrostatic precipitator electric field inner part that causes owing to the spark flashover and the loss of insulating element; And the short circuit peak the when response time has reduced the deduster flashover has fast reduced energy loss.
(4) electrostatic precipitator of the utility model is used the high pressure intermediate frequency power supply; Also comprise human-computer interaction interface; Can set the frequency of the medium frequency alternating current after the said inversion through this human-computer interaction interface, the frequency of said like this intermediate frequency can also be provided with through manual work, has further improved its scope of application.
(5) electrostatic precipitator of the utility model is used the high pressure intermediate frequency power supply, and said inverter is two phase full-bridge inverters, and said rectifier is the three phase full wave rectification bridge of being made up of commutation diode, and is easy to use, cheap.
Description of drawings
For the content that makes the utility model is more clearly understood,, the utility model is done further detailed explanation, wherein below according to the specific embodiment of the utility model and combine accompanying drawing
Fig. 1 is the system construction drawing of the electrostatic precipitator that provides of the utility model with the high pressure intermediate frequency power supply;
Fig. 2 is the structural representation of the electrostatic precipitator that provides of the utility model with the high pressure intermediate frequency power supply.
Reference numeral is expressed as among the figure: 1-imports power supply, 2-rectifier, 3-wave filter, 4-inverter, 5-high-voltage rectifying transformer, 6-controller, 7-IGBT driver, 8-human-computer interaction interface, 9-power transfer module, 10-signal converter.
The specific embodiment
Provide the described electrostatic precipitator of the utility model below with one of the high pressure intermediate frequency power supply concrete embodiment; Electrostatic precipitator is used the high pressure intermediate frequency power supply; As shown in Figure 1; Comprise: the input power supply 1 of three-phase 380V power frequency 50Hz, rectification unit, inverter 4, high-voltage rectifying transformer 5 and controller 6 with rectifier 2 and wave filter 3
Rectification unit; Comprise rectifier 2 and wave filter 3; The rectifier of here selecting 2 is the three phase full wave rectification bridge of being made up of commutation diode, and said rectifier 2 is a direct current with the AC rectification of the three-phase 380V power frequency 50Hz of input, and said direct current is exported after said wave filter 3 filtering again;
Inverter 4; Said inverter 4 is two phase full-bridge inverters 4; Wherein be provided with the IGBT switching tube; The on off state of said IGBT switching tube is driven by IGBT driver 7, and with the medium frequency alternating current that said filtered dc inverter is two phases, the frequency size of the alternating current here is between 100Hz-1000HZ;
High-voltage rectifying transformer 5 is used for being the electrostatic precipitator power supply after the midfrequent ac electric boost rectification of said two phases;
Controller 6; The frequency of the medium frequency alternating current after 4 inversions of said controller 6 control inverters size comprises that frequency selects converting unit, obtains the optimal frequency of the medium frequency alternating current after the said inverter inversion; Be said high-voltage rectifying transformer power supply, thereby be the electrostatic precipitator power supply.The process that obtains said optimal frequency is: said frequency selects converting unit according to the type of high-voltage rectifying transformer 5 selectable operating frequency range to be set; N frequency values is set in said selectable operating frequency range; The frequency of the medium frequency alternating current after said inverter 4 transmission signals make inversion sets gradually the frequency values into said n then; Detect and write down the output current and the voltage of the corresponding said high-voltage rectifying transformer 5 of each frequency values then successively, calculate the product of said current value and magnitude of voltage; Frequency value corresponding is an optimal frequency when selecting the product of said current value and magnitude of voltage maximum, and the medium frequency alternating current that is provided with after said inverter 4 inversions is said optimal frequency, is said high-voltage rectifying transformer 5 power supplies, thereby supplies power for electrostatic precipitator.
Because the impedance of the high-voltage rectifying transformer 5 that generally uses now is divided into high resistant, middle resistance, low-resistance, rule of thumb value and field condition are set, if said high-voltage rectifying transformer 5 is the high resistant impedance, are prone to select low operating frequency such as 100-400Hz; If said high-voltage rectifying transformer 5 is middle resistance impedance, the operating frequency that then is prone to select is 200-600Hz; If said high-voltage rectifying transformer 5 is the impedance of low rent, the operating frequency that then is prone to select is 300-1000Hz.For high-voltage rectifying transformer 5 operate as normal that guarantee above-mentioned different impedance types, when said high-voltage rectifying transformer 5 was the high resistant impedance, said selectable operating frequency range was 100Hz-400Hz; When said high-voltage rectifying transformer 5 was middle resistance impedance, said selectable operating frequency range was 200Hz-600Hz; When said high-voltage rectifying transformer 5 was the low-resistance impedance, said selectable operating frequency range was 300Hz-1000Hz.
Output at said high-voltage rectifying transformer 5 is provided with voltage acquisition module and current acquisition module; Said voltage acquisition module and current acquisition module send to said controller 6 with detected voltage and current information; Said voltage acquisition module can be realized by divider resistance; As shown in Figure 2; Output at high-voltage rectifying transformer 5 connects the first divider resistance R1 and the second divider resistance R2 that connects, and as feedback voltage, this feedback voltage is sent to controller 6 through the voltage on the 3rd resistance R 3 collections second divider resistance R2.Because the output voltage of high-voltage rectifying transformer 5 is high pressure, controller 6 manageable signals are low-voltage signal, so send to controller 6 after needing signal converter 10 that the forceful electric power signal is transformed to weak electric signal; Said current acquisition module can be gathered the output current of high-voltage rectifying transformer 5 through the 4th resistance R 4, and an end of the 4th resistance R 4 connects the negative output terminal of high-voltage rectifying transformer 5, and the other end connects the input of signal converter 10.Signal converter 10 sends to controller 6 after current signal is transformed to the range of signal that controller 6 can receive.In addition, human-computer interaction interface 8 can also be set, can set the size of the frequency of the medium frequency alternating current after the said inversion through this human-computer interaction interface 8.The described electrostatic precipitator of present embodiment is used the high pressure intermediate frequency power supply; Also power transfer module 9 need be set; Be used for importing power supply 1 (alternating current of three-phase 380V) convert into+12V ,-12V ,+power supply of 5V, wherein ,+12V is the circuit part power supply of IGBT driver 7; + 12V ,-12V is the power supply of interface board integrated operational amplifier ,+5V is that controller 6 is supplied power with the interface board digital circuit.
Provide the method for supplying power to of above-mentioned electrostatic precipitator below, comprise the steps: with the high pressure intermediate frequency power supply
(1) with the alternating current input rectifier 2 of three-phase 380V power frequency 50HZ, be direct current with said input power supply 1 rectification;
(2) with said direct current through wave filter 3 filtering, in filtered direct current input inverter 4;
(3) frequency translation unit of said controller 6 is provided with selectable operating frequency range according to the type of said high-voltage rectifying transformer 5; High-voltage rectifying transformer described in the present embodiment 5 is middle resistance impedance; Its selectable operating frequency range is 200-600Hz, and 9 frequency value F 1=200, F2=250, F4=300, F4=350, F5=400, F6=450, F7=500, F8=550, F9=600 are set in said operating frequency range;
(4) frequency of the medium frequency alternating current of said controller 6 after said inverter 4 transmission signals make inversion is F1; Said inverter 4 receives the control signal of controller 6; The frequency that is two phases with said filtered dc inverter is the alternating current of F1, exports to high-voltage rectifying transformer 5;
(5) said high-voltage rectifying transformer 5 is that the alternating current of F1 boosts and exports after the rectification with the frequency of said two phases; Said controller 6 detects and writes down the electric current I 1 and voltage U 1 of said high-voltage rectifying transformer 5 outputs through measurement mechanism, calculate the product A1 of said electric current I 1 and voltage U 1 then;
(6) with said F1 set gradually into F2 ..., F9, repeating step (4)-(5) successively, said controller 6 obtains that frequency is (F1 after the inversions;, the product of current corresponding and voltage in the time of F9) (A1 ... A9); Select wherein maximum max A1 ..., A9 } and corresponding frequency is optimal frequency F;
(7) frequency of the medium frequency alternating current of said controller 6 after said inverter 4 transmission signals make inversion is said optimal frequency F; Said inverter 4 receives the control signal of controller 6; The frequency that is two phases with said filtered dc inverter is the alternating current of said optimal frequency, exports to high-voltage rectifying transformer 5;
(8) said high-voltage rectifying transformer 5 is that the alternating current of optimal frequency boosts and exports after the rectification with the frequency of said two phases, is the electrostatic precipitator power supply.
In said step (3), if when said high-voltage rectifying transformer 5 is middle resistance impedance, then said selectable operating frequency range is 200Hz-600Hz; If when said high-voltage rectifying transformer 5 was the high resistant impedance, then said selectable operating frequency range was 300Hz-1000Hz, when said high-voltage rectifying transformer 5 was the low-resistance impedance, said selectable operating frequency range was 300Hz-1000Hz; The frequency values that is provided with in the said selectable operating frequency range is 2-100, in said selectable frequency range, evenly distributes.
The electrostatic precipitator that present embodiment provides is used the high pressure intermediate frequency power supply; The intermediate frequency power supply approaching with the high frequency electric source performance can be provided, and its operating frequency is 100Hz-1000Hz, because the induction reactance of high-voltage rectifying transformer 5 is different under the different working frequency; Frequency is high more; Induction reactance is big more, and the trailing edge and the rising edge of secondary voltage and secondary current waveform are slow more, so its product is not necessarily big more; And the efficient of deduster is not necessarily high more, makes deduster can be operated in the best state of efficient through the working method of selecting optimal frequency.Adopt this intermediate frequency power supply to need not to change equipment such as existing high-voltage rectifying transformer 5, power line, isolating switch.Under same electric field, use intermediate frequency power supply can make deduster improve about 15% operating voltage, increase by about 25% dedusting power, and effectively suppress the flashover strength of electrostatic precipitator electric field, the unnecessary loss when reducing deduster generation flashover.Through the intermediate frequency power supply that uses the utility model to provide, can reduce the ripple of the AC power of high-voltage rectifying transformer 5 secondary side voltages, improve the ratio of secondary side average voltage and crest voltage, improve the voltage-to-current curve of electrostatic precipitator.Simultaneously, falling of secondary side voltage will reduce, and the increase of secondary side voltage causes the increase of secondary current, thereby improve the efficiency of dust collection of electrostatic precipitator.
Obviously, the foregoing description only be for explanation clearly done for example, and be not qualification to embodiment.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being extended out thus or change still are among the protection domain of the utility model creation.
Claims (7)
1. an electrostatic precipitator is used the high pressure intermediate frequency power supply, comprising:
Rectification unit comprises rectifier and wave filter, and said rectifier is a direct current with the AC rectification of the three-phase 380V power frequency 50Hz of input, and said direct current is exported behind said filter filtering again;
Inverter is with the said filtered dc inverter medium frequency alternating current that is two phases;
High-voltage rectifying transformer is used for being the electrostatic precipitator power supply after the midfrequent ac electric boost rectification of said two phases;
It is characterized in that: also comprise controller; The frequency size of the medium frequency alternating current after the inversion of said controller control inverter; Comprise frequency selection converting unit; Obtaining the optimal frequency of the medium frequency alternating current after the said inverter inversion, is said high-voltage rectifying transformer power supply, thereby supplies power for electrostatic precipitator.
2. electrostatic precipitator according to claim 1 is used the high pressure intermediate frequency power supply, it is characterized in that: the frequency range of said medium frequency alternating current is 100Hz-1000Hz.
3. electrostatic precipitator according to claim 1 and 2 is used the high pressure intermediate frequency power supply, it is characterized in that: be provided with the IGBT switching tube in the said inverter.
4. electrostatic precipitator according to claim 3 is used the high pressure intermediate frequency power supply; It is characterized in that: the output at said high-voltage rectifying transformer is provided with voltage acquisition module and current acquisition module, and said voltage acquisition module and current acquisition module send to said controller with detected voltage and current information.
5. electrostatic precipitator according to claim 4 is used the high pressure intermediate frequency power supply, it is characterized in that: also comprise human-computer interaction interface, can set the frequency of the medium frequency alternating current after the said inversion through this human-computer interaction interface.
6. electrostatic precipitator according to claim 5 is used the high pressure intermediate frequency power supply, it is characterized in that: said inverter is two phase full-bridge inverters.
7. electrostatic precipitator according to claim 6 is used the high pressure intermediate frequency power supply, it is characterized in that: the three phase full wave rectification bridge of said rectifier for being made up of commutation diode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203963008U CN202290307U (en) | 2011-10-18 | 2011-10-18 | High voltage intermediate frequency (IF) power supply for electrostatic precipitator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203963008U CN202290307U (en) | 2011-10-18 | 2011-10-18 | High voltage intermediate frequency (IF) power supply for electrostatic precipitator |
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| CN202290307U true CN202290307U (en) | 2012-07-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108187914A (en) * | 2018-01-17 | 2018-06-22 | 厦门龙净环保节能科技有限公司 | A kind of dedusting power control method, device and power-supply device |
| CN108448914A (en) * | 2018-05-22 | 2018-08-24 | 东南大学 | A kind of intermediate frequency static dust-removing power circuit |
-
2011
- 2011-10-18 CN CN2011203963008U patent/CN202290307U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108187914A (en) * | 2018-01-17 | 2018-06-22 | 厦门龙净环保节能科技有限公司 | A kind of dedusting power control method, device and power-supply device |
| CN108448914A (en) * | 2018-05-22 | 2018-08-24 | 东南大学 | A kind of intermediate frequency static dust-removing power circuit |
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Denomination of utility model: High-voltage and medium-frequency power supply for electrostatic dust collector and power supply method thereof Effective date of registration: 20121112 Granted publication date: 20120704 Pledgee: Bengbu SME finance Company limited by guarantee Pledgor: Enelco Environmental Technology Co., Ltd. Registration number: 2012990000682 |
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Change date: 20141231 Registration number: 2012990000682 Pledgee after: Bengbu financing guarantee Group Co., Ltd. Pledgee before: Bengbu SME finance Company limited by guarantee |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: High-voltage and medium-frequency power supply for electrostatic dust collector and power supply method thereof Effective date of registration: 20150116 Granted publication date: 20120704 Pledgee: Bengbu hi tech Investment Group Limited Pledgor: Enelco Environmental Technology Co., Ltd. Registration number: 2015990000041 |
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Date of cancellation: 20160607 Granted publication date: 20120704 Pledgee: Bengbu hi tech Investment Group Limited Pledgor: Enelco Environmental Technology Co., Ltd. Registration number: 2015990000041 |
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