CN218554397U - Novel control system of electric dust remover - Google Patents
Novel control system of electric dust remover Download PDFInfo
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- CN218554397U CN218554397U CN202220412500.6U CN202220412500U CN218554397U CN 218554397 U CN218554397 U CN 218554397U CN 202220412500 U CN202220412500 U CN 202220412500U CN 218554397 U CN218554397 U CN 218554397U
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Abstract
The utility model discloses a novel electrostatic precipitator control system, including three-phase ac contactor, three-phase rectifier, chopper, wave filter, dc-to-ac converter, high frequency step up transformer, high frequency rectifier, electrostatic precipitator that loop through circuit electric connection, chopper, dc-to-ac converter are all connected on digital signal processor, digital signal processor communication connection has a plurality of samplers that are used for gathering flue gas flow, smoke and dust concentration, the electric line connection between digital signal processor and high frequency rectifier, electrostatic precipitator has simple structure, can satisfy the requirement of dust removal operating efficiency, can greatly reduce technical characterstic such as the loss of electric quantity again.
Description
Technical Field
The utility model relates to a control system, more specifically say a bit, relate to a novel electrostatic precipitator control system, belong to the power plant field.
Background
Generally, an electric dust collector and an ash conveying system are almost maintained to operate under the design working condition when the corresponding design coal type is full load, manual adjustment amount in the medium-load and low-load stages is mainly based on an operation experience value, and the adjustment amount is limited, so that the medium-load and low-load sections are low in dust removal efficiency, more electric energy is wasted, the power consumption of a plant is influenced, and the overall economy of the plant is reduced. In the process of electric dust removal operation, due to the influences of factors such as boiler load, coal quality change and the like, the operation working condition of the electric dust remover is always in the dynamic change process, the power supply parameters of the electric dust remover cannot synchronously change along with the operation working condition, and the electric dust remover cannot be operated in the optimal condition all the time.
SUMMERY OF THE UTILITY MODEL
In order to solve the prior art problem, the utility model provides a novel electrostatic precipitator control system who has simple structure, can satisfy the requirement of dust removal operating efficiency, can greatly reduce technical characterstic such as the loss of electric quantity again.
In order to achieve the above purpose, the utility model discloses a realize through following technical scheme:
the utility model provides a novel electrostatic precipitator control system, includes three-phase ac contactor, three-phase rectifier, chopper, wave filter, dc-to-ac converter, high frequency step-up transformer, high frequency rectifier, electrostatic precipitator that loop through circuit electric connection, chopper, dc-to-ac converter are all connected on digital signal processor, digital signal processor communication connection has a plurality of samplers that are used for gathering flue gas flow, smoke and dust concentration, the electric line connection between digital signal processor and high frequency rectifier, electrostatic precipitator.
Preferably, the chopper and the inverter are both connected with the digital signal processor through a driving circuit with isolation.
Preferably, the device comprises a first sampler and a second sampler, wherein the first sampler is used for collecting the total smoke quantity and the smoke concentration value at the inlet of the electric dust remover, and the second sampler is used for collecting the smoke concentration value at the outlet of the electric dust remover.
Preferably, the inverter is an IGBT full bridge inverter.
Preferably, the digital signal processor adopts a TMS320F28335 chip of TI company as a main controller.
Has the beneficial effects that: the dust removal device has the technical characteristics of simple structure, capability of meeting the requirement of dust removal operation efficiency, capability of greatly reducing the loss of electric quantity and the like.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following embodiments.
The prior high-frequency switching power supply technology is widely applied to the field of electric precipitation, and has the following great advantages: the efficiency and power factors are higher, generally more than 0.9; the pollution to the power grid is obviously reduced; the working frequency of the high-voltage rectifier transformer is improved, the volume of the transformer is greatly reduced, and the manufacturing cost of the product is correspondingly reduced; the parameters of the output voltage waveform such as amplitude and period can be adjusted in a large range. Therefore, the problems of corona closing and back corona of the electric dust remover can be effectively solved, and the running performance of the electric dust remover is greatly improved.
As shown in fig. 1, the embodiment of the novel control system for the electric precipitator is a novel control system for the electric precipitator, which comprises a three-phase ac contactor, a three-phase rectifier, a chopper, a filter, an inverter, a high-frequency step-up transformer, a high-frequency rectifier and an electric precipitator which are sequentially electrically connected through a line, wherein the chopper and the inverter are both connected to a digital signal processor, the digital signal processor is in communication connection with a plurality of samplers for collecting flue gas flow and flue gas concentration, and the digital signal processor is connected with the electric line between the high-frequency rectifier and the electric precipitator.
In a preferred embodiment, the chopper and the inverter are both connected to the digital signal processor through a driving circuit with isolation, the driving circuit is an intermediate circuit for amplifying a signal of the control circuit (digital signal processor), and a specific structure of the driving circuit belongs to the prior art, which is not described in detail in this application.
The chopper is a dc power supply device that converts dc power having a fixed voltage value into dc power having a variable voltage value. The inverter outputs flexible and variable alternating current pulses with frequency, amplitude and width according to the working condition change of the electric dust collector. The chopper and the inverter are in the prior art, and the structure of the chopper and the inverter is not described in detail in the application.
The sampling device comprises a first sampling device and a second sampling device, wherein the first sampling device is used for collecting the total smoke quantity and the smoke concentration value at the inlet of the electric dust remover, and the second sampling device is used for collecting the smoke concentration value at the outlet of the electric dust remover. The digital signal processor obtains the total ash amount according to the total flue gas amount and the smoke concentration value (increasing the flue gas flow and the total smoke concentration measuring point) at the inlet of the electric dust remover, and then uses the total ash amount as feedforward (the coefficient can be manually and finely adjusted by an operator), on the other hand, the digital signal processor uses the fly ash concentration in the current smoke as feedback to realize closed-loop control, thereby improving the dust removal efficiency and saving the energy consumption to the maximum extent, preventing the problem that the fly ash concentration in the smoke can exceed the standard under special working conditions, and the digital signal processor can increase the pulse period of the high-frequency power supply at an ultra-late time when the fly ash concentration in the smoke reaches the early warning value, thereby realizing high-efficiency dust removal and ensuring that the fly ash concentration in the smoke does not exceed the standard.
In a preferred embodiment, the inverter is an IGBT full bridge inverter. And triggering the IGBT full-bridge inverter through the digital signal processor to realize inversion. The digital signal processor samples signals, analyzes and judges the working state of the electric dust remover, analyzes the working condition of the electric dust remover while finishing spark judgment, and performs automatic closed-loop regulation on the premise that conditions allow. The closed loop dynamic optimization control ensures that the dust remover always works in the optimal state. The system is convenient to adjust in real time according to the working condition, so that the optimal working point of the dust remover is tracked, and the system runs in the optimal state.
In a preferred embodiment, the DSP chip is a TMS320F28335 chip from TI corporation as a master controller. The digital signal processor triggers the high-frequency inversion control of the IGBT full-bridge inverter, the adjustment of duty ratio and amplitude ratio is realized, the working state of the electric dust remover can be sampled, analyzed, judged and processed, the reliable driving of the IGBT full-bridge inverter is realized, the inversion reliability is ensured, the working condition of the electric dust remover is analyzed, and the automatic closed-loop adjustment is realized.
The principle is as follows: the method comprises the steps of outputting and rectifying an input three-phase 380V power frequency 50Hz alternating current power supply through a three-phase rectifier, a chopper and a filter after controllable rectification and filtering to obtain 540V direct current voltage with a variable voltage value, supplying the direct current voltage to a high-frequency inverter circuit (an IGBT full-bridge inverter), outputting alternating current pulses with variable frequency, amplitude and width flexibly according to the working condition change of the electric dust collector by the high-frequency inverter circuit, outputting high-voltage direct current pulse voltage after boosting and rectifying through a high-frequency boosting transformer and a high-frequency rectifier to supply an electric field of the electric dust collector, and realizing signal acquisition and driving control of an inverter circuit by a digital signal processor. The method comprises the following steps: according to the change of the total ash amount and the fly ash concentration in the flue gas, the duty ratio of the high-frequency pulse and the low-frequency pulse in the whole period is changed by automatically adjusting the frequency and the pulse number of the high-frequency pulse and the low-frequency pulse in the high-frequency power supply, and when the unit load is higher, the generated total ash amount is larger, and the fly ash concentration in the flue gas is higher, the pulse period of the input high-frequency power supply is relatively increased; when the unit load is lower, the total ash amount produced is small, and the fly ash concentration in the flue gas is less, the pulse period of the input high-frequency power supply is relatively reduced, so that the requirement of dust removal operation efficiency can be met, the loss of electric quantity can be greatly reduced, and the high-frequency power supply can play a greater role particularly under the working condition of high specific resistance dust.
According to the electric dust collector, closed-loop optimization control is performed, the high-frequency high-voltage pulse power supply of the electric dust collector and the smoke dust emission concentration of the electric dust collector are improved by about 10% -30% compared with those of a conventional power supply under the same condition, the electric energy consumption of the electric dust collector is reduced by more than 80% at most on the original basis, and the energy-saving and emission-reduction operation of the electric dust collector is really realized. The closed loop dynamic optimization control ensures that the dust remover always works in the optimal state. The system is convenient to adjust in real time according to the working condition, so that the optimal working point of the dust remover is tracked, and the system runs in the optimal state.
Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.
Claims (4)
1. The utility model provides a novel electrostatic precipitator control system which characterized in that: the system comprises a three-phase alternating current contactor, a three-phase rectifier, a chopper, a filter, an inverter, a high-frequency step-up transformer, a high-frequency rectifier and an electric dust remover which are electrically connected in sequence through a line, wherein the chopper and the inverter are both connected to a digital signal processor, the digital signal processor is in communication connection with a plurality of samplers for collecting flue gas flow and smoke dust concentration, and the digital signal processor is connected with an electric line between the high-frequency rectifier and the electric dust remover;
the chopper and the inverter are both connected with the digital signal processor through a drive circuit with isolation.
2. The novel electric dust collector control system as claimed in claim 1, wherein: the device comprises a first sampler (1) and a second sampler (2), wherein the first sampler (1) is used for collecting the total smoke amount and the smoke concentration value at the inlet of the electric dust remover, and the second sampler (2) is used for collecting the smoke concentration value at the outlet of the electric dust remover.
3. The novel electric dust collector control system as claimed in claim 1, wherein: the inverter is an IGBT full-bridge inverter.
4. The novel electric dust collector control system as claimed in claim 1, wherein: the digital signal processor adopts a TMS320F28335 chip as a main controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220412500.6U CN218554397U (en) | 2022-02-28 | 2022-02-28 | Novel control system of electric dust remover |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220412500.6U CN218554397U (en) | 2022-02-28 | 2022-02-28 | Novel control system of electric dust remover |
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| CN218554397U true CN218554397U (en) | 2023-03-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116689152A (en) * | 2023-07-03 | 2023-09-05 | 河南龙泉金亨电力有限公司 | Electrostatic dust-removing high-voltage power supply device for thermal power generating unit |
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2022
- 2022-02-28 CN CN202220412500.6U patent/CN218554397U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116689152A (en) * | 2023-07-03 | 2023-09-05 | 河南龙泉金亨电力有限公司 | Electrostatic dust-removing high-voltage power supply device for thermal power generating unit |
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