Control device and control method for electrostatic dust collector

Abstract

The invention discloses a control device and a control method for an electrostatic dust collector. The device comprises a power supply circuit, a polarity control circuit, a dust collection bin and a dust storage bin, the openable and closable isolation plate is arranged in the dust removal bin; when the isolation plate is closed, the cavity of the dust removal bin is divided into an upper cavity and a lower cavity; the vertically arranged corona electrode is positioned in the upper cavity; the horizontally arranged dust collection polar plate is positioned at the bottom of the lower cavity; a dust removal brush for pushing and sweeping dust is arranged on the dust collection polar plate; the corona electrode and the dust collection polar plate are connected in parallel to a power supply circuit through respective connection ports; a corona electrode control branch circuit of the polarity control circuit is used for controlling the on-off of a corona electrode branch loop according to the control electric signal; a polarity control branch of the polarity control circuit is used for controlling the electrifying polarity of the dust collection polar plate according to the control electric signal. According to the invention, the possibility that dust enters the air outlet can be effectively prevented; and the dust removal effect of the electrostatic dust remover is improved.

Description

Technical Field

[0001] The present invention relates to the field of industrial control, and in particular to a control device and a control method for an electrostatic precipitator. Background Art

[0002] The working principle of the electrostatic precipitator is: high voltage is applied between the dust collecting electrode and the corona electrode to cause a corona phenomenon at the corona electrode, which generates a large number of positive ions and free electrons by breaking down the air. In the process of the free electrons moving toward the dust collecting electrode under the action of the high voltage electric field force between the positive and negative electrodes, the dust particles in contact with them will be charged, which will cause the dust particles to move toward the dust collecting electrode plate and eventually be adsorbed by the dust collecting electrode plate.

[0003] In the prior art, in order to maintain the dust removal efficiency of the electrostatic precipitator, it is necessary to periodically shake off the dust adsorbed on the dust collecting plate by mechanical shaking.

[0004] The inventors have found through research that the conventional method of maintaining the dust removal efficiency of the electrostatic precipitator has at least the following defects:

[0005] The vibration process takes a long time and easily causes secondary dust, so the traditional mechanical vibration method will affect the dust removal efficiency of the electrostatic precipitator.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The object of the present invention is to improve the dust removal efficiency of an electrostatic precipitator.

[0008] The present invention provides a control device for an electrostatic precipitator, comprising: a power supply circuit, a polarity control circuit, a dust removal bin and a dust storage bin;

[0009] An openable and closable isolation plate is arranged in the dust removal bin; when the isolation plate is closed, the cavity of the dust removal bin is divided into an upper cavity and a lower cavity; a vertically arranged corona electrode is located in the upper cavity; a horizontally arranged dust collecting electrode plate is located at the bottom of the lower cavity; a dust gas inlet connected to the dust removal bin is arranged at the lower part of the upper cavity; a dust outlet for connecting to the dust collecting bin is arranged at the lower part of the lower cavity; a dust brush for sweeping dust is arranged on the dust collecting electrode plate;

[0010] The corona electrode and the dust collecting electrode plate are respectively connected in parallel to a power supply circuit through their respective connection ports;

[0011] The polarity control circuit includes a corona electrode control branch and a polarity control branch; the corona electrode control branch is used to control the on and off of the corona electrode branch circuit according to the control electrical signal; the polarity control branch is used to control the electrification polarity of the dust collecting electrode plate according to the control electrical signal.

[0012] Preferably, in an embodiment of the present invention, the power supply circuit includes:

[0013] The industrial frequency power supply interface, the rectifier circuit, the high frequency inverter, the transformer, the high frequency rectifier circuit and the filter are connected in sequence.

[0014] Preferably, in an embodiment of the present invention, the corona electrode control branch comprises:

[0015] A first bridge arm of an IGBT module is provided; the IGBT module can switch on and off the corona pole branch circuit according to a control electrical signal.

[0016] Preferably, in an embodiment of the present invention, the polarity control branch includes a plurality of bridge arms provided with IGBT modules, including:

[0017] The second bridge arm and the third bridge arm are connected in series and connected between the positive and negative ends of the power supply circuit; the fourth bridge arm and the fifth bridge arm are connected in series and connected between the positive and negative ends of the power supply circuit;

[0018] The connection point of the second bridge arm and the third bridge arm is connected to the circuit at one end of the dust collecting plate, and the connection point of the fourth bridge arm and the fifth bridge arm is connected to the circuit at the other end of the dust collecting plate.

[0019] Preferably, in the embodiment of the present invention, it also includes:

[0020] An adsorption amount monitoring unit for collecting dust adsorption amount of dust collecting plates, and a processing unit for generating a control electrical signal of the polarity control circuit according to the monitoring information;

[0021] Preferably, in an embodiment of the present invention, the adsorption amount monitoring unit includes a sensor group consisting of a plurality of photoelectric sensors; the photoelectric sensors are arranged on the dust collecting plate.

[0022] Preferably, in an embodiment of the present invention, the processing unit includes:

[0023] Generate control electrical signals for each IGBT module, control instructions for the isolation plate, and control instructions for the dust removal brush according to preset rules; the preset rules are used to:

[0024] During the dust adsorption stage:

[0025] The isolation plate is controlled to be in an open state, and the isolation plate is closed when the proportion of the photoelectric sensors whose photoelectric signals are blocked in the sensor group exceeds a preset threshold value; the corona electrode is electrified with negative polarity through a polarity control circuit, and the dust collecting electrode is electrified with positive polarity;

[0026] During the dust collection stage:

[0027] Close the isolation plate, disconnect the circuit loop of the corona electrode in the electrostatic precipitator, and convert the circuit polarity of the dust collecting plate to connect to the negative polarity and then disconnect the circuit loop of the dust collecting plate; control the dust removal brush to sweep the dust on the dust collecting plate to the dust storage bin through the dust outlet.

[0028] In another aspect of the present invention, a control method for an electrostatic precipitator is also provided, which is applicable to the above control device, comprising the steps of:

[0029] S11, controlling the isolation plate to be in an open state to introduce the dust gas into the dust removal bin;

[0030] S12, performing dust adsorption, including: applying negative polarity electricity to the corona electrode through a polarity control circuit, and applying positive polarity electricity to the dust collecting electrode plate;

[0031] S13, when the dust adsorption amount of the dust collecting plate reaches a preset threshold, the isolation plate is closed;

[0032] S14, disconnecting the circuit loop of the corona electrode in the electrostatic precipitator, and immediately disconnecting the circuit loop of the dust collecting electrode plate after converting the circuit polarity of the dust collecting electrode plate to negative polarity electricity;

[0033] S15, the air after dust removal in the upper cavity is discharged from the dust removal bin through the gas outlet, and the dust removal brush is controlled to sweep the dust on the dust collecting plate to the dust collecting bin through the dust outlet.

[0034] Preferably, in an embodiment of the present invention, it includes:

[0035] The IGBT module is used as a circuit switch to realize the circuit loop of the corona electrode and to change the circuit polarity of the dust collecting electrode.

[0036] Preferably, in an embodiment of the present invention, determining the dust adsorption amount of the dust collecting plate includes:

[0037] Acquire photoelectric signals collected by multiple photoelectric sensors in a sensor group arranged on the dust collecting plate;

[0038] The dust adsorption capacity of the dust collecting plate is determined according to the proportion of the photoelectric sensors whose photoelectric signals are blocked in the sensor group.

[0039] Preferably, in an embodiment of the present invention, the step of passing negative polarity electricity to the corona electrode and positive polarity electricity to the dust collecting electrode plate through a polarity control circuit comprises:

[0040] The first bridge arm, the second bridge arm and the fifth bridge arm are turned on, and the third bridge arm and the fourth bridge arm are turned off.

[0041] Preferably, in an embodiment of the present invention, the circuit loop of the corona electrode in the electrostatic precipitator is disconnected, and the circuit polarity of the dust collecting electrode plate is converted to the negative polarity and then the circuit loop of the dust collecting electrode plate is disconnected immediately, comprising:

[0042] The first bridge arm, the second bridge arm and the fifth bridge arm are turned off, and the third bridge arm and the fourth bridge arm are turned on momentarily and then turned off immediately.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] In the present invention, a partition plate is provided which can divide the cavity of the dust removal bin into an upper cavity and a lower cavity, and a dust collecting electrode plate is horizontally arranged at the bottom of the lower cavity; in this way, when the electrostatic precipitator enters the dust adsorption stage, the dust in the dust removal bin will drop to the lower cavity and be adsorbed on the dust collecting electrode plate at the bottom; when the dust adsorption amount of the dust collecting electrode plate reaches a certain threshold, it enters the dust collection stage, at this time, on the one hand, the lower cavity where the dust is concentrated is isolated from the upper cavity with a very small dust content by closing the partition plate; on the other hand, the corona electrode is also closed and the polarity of the dust collecting electrode plate is instantly converted to eliminate the adsorption force of the dust on the dust collecting electrode plate; in this way, the gas after dust removal in the upper cavity can be discharged from the dust removal bin through the gas outlet, and at the same time, the dust falling on the dust collecting electrode plate is swept into the dust collection bin through the dust outlet by the dust removal brush; when the dust collection stage is completed, it returns to the dust adsorption stage.

[0045] Since the present invention adopts a non-vibrating method when removing dust from the electrode plates and isolates the dust from the gas after dust removal, it can effectively avoid the flying of dust, thus effectively preventing the possibility of dust entering the air outlet; thereby improving the dust removal effect of the electrostatic precipitator.

[0046] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the structure of the control device for the electrostatic precipitator in the present invention;

[0048] Figure 2 It is another structural schematic diagram of the control device for the electrostatic precipitator in the present invention;

[0049] Figure 3 It is a step diagram of the control method for an electrostatic precipitator described in the present invention. DETAILED DESCRIPTION

[0050] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0051] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0052] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0053] Embodiment 1

[0054] In order to improve the dust removal effect of electrostatic precipitator, Figure 1 As shown, in an embodiment of the present invention, a control device for an electrostatic precipitator is provided, including a power supply circuit 01, a polarity control circuit 02, a dust removal bin 03 and a dust collection bin 04; an openable and closable isolation plate 31 is arranged in the dust removal bin 03; when the isolation plate 31 is closed, the cavity of the dust removal bin 03 is divided into an upper cavity 32 and a lower cavity 33; a vertically arranged corona electrode 34 is located in the upper cavity 32; a horizontally arranged dust collecting electrode plate 35 is located at the bottom of the lower cavity 33; a dust gas inlet 36 connected to the dust removal bin 03 is arranged in the upper cavity 32 The lower part of the lower cavity 33; the dust outlet 37 for connecting to the dust storage bin 04 is arranged at the lower part of the lower cavity 33; the dust collecting electrode plate 35 is provided with a dust brush 38 for sweeping the dust; the corona electrode 34 and the dust collecting electrode plate 35 are respectively connected in parallel to the power supply circuit 01 through their respective connection ports; the polarity control circuit 02 includes a corona electrode control branch 21 and a polarity control branch 22; the corona electrode control branch 21 is used to control the on and off of the corona electrode branch circuit according to the control electrical signal; the polarity control branch 22 is used to control the electrification polarity of the dust collecting electrode plate 35 according to the control electrical signal.

[0055] In practical applications, the power supply circuit 01 of the embodiment of the present invention for providing the required high-voltage pulse power for electrostatic precipitator may specifically include: an industrial frequency power supply interface, a rectifier circuit, a high-frequency inverter, a transformer, a high-frequency rectifier circuit and a filter connected in sequence.

[0056] The specific working principle of the embodiment of the present invention includes:

[0057] First, a partition plate 31 is provided to divide the cavity of the dust removal bin 03 into an upper cavity 32 and a lower cavity 33; the partition plate 31 in the embodiment of the present invention can be switched between closed and open states through a driving mechanism; preferably, reference Figure 1 and Figure 2 The isolation plate 31 in the embodiment of the present invention can be divided into two parts, which are respectively hinged on the two sides of the dust removal bin (similar to two doors); in this way, the closing and opening of the isolation plate 31 can be controlled like opening and closing a door.

[0058] refer to Figure 1 When the isolation plate 31 is open (i.e., in an open state), the cavity of the dust removal bin 03 is integrated, and dust adsorption can be performed at this time. The specific method can be:

[0059] The dust gas is introduced into the dust removal bin 03 through the dust gas inlet 36, and then, the corona electrode 34 is negatively charged and the dust collecting electrode plate 35 is positively charged through the polarity control circuit 02; at this time, the dust gas in the dust removal bin 03 will produce a corona phenomenon, and a large number of positive ions and free electrons are generated by breaking down the air. The free electrons move toward the dust collecting electrode under the action of the high-voltage electric field force between the positive and negative electrodes, and collide with the dust particles in the dust removal bin 03 during the process of forced movement, so that the dust particles are charged, and the charged dust particles are affected by the high-voltage electric field force and move toward the dust collecting electrode plate 35 at a certain rate, and are finally adsorbed on the dust collecting electrode plate 35.

[0060] When the dust adsorption amount on the dust collecting plate 35 exceeds a certain threshold, it will affect the subsequent dust adsorption efficiency. Therefore, in the embodiment of the present invention, periodic dust collection is also required to clean and collect the dust on the dust collecting plate 35; in actual applications, the timing of dust collection can be determined by estimating a fixed time period based on the actual working conditions, or the timing of dust collection can be determined based on the monitoring results of the dust adsorption amount on the dust collecting plate 35.

[0061] In order to prevent the dust generated during the dust collection process from causing secondary pollution to the exhaust air after dust removal in the embodiment of the present invention, when performing dust collection, the isolation plate 31 must first be closed, so that the cavity of the dust collection bin 03 is divided into an upper cavity 32 and a lower cavity 33; in the upper cavity 32 is the clean air after dust removal, and this part of the clean air can be discharged through the gas outlet; then, since the dust collecting electrode plate 35 adsorbed with dust is in the lower cavity 33, in this way, by disconnecting the circuit loop of the corona electrode in the electrostatic precipitator and converting the circuit polarity of the dust collecting electrode plate to the circuit loop of the dust collecting electrode plate immediately after connecting the negative polarity electricity, the polarity of the dust collecting electrode plate 35 is opposite to that of the previous moment, generating an instantaneous reverse electric field force, thereby eliminating the adsorption force of the dust particles on the dust collecting electrode plate 35 caused by the charge; then, by controlling the pushing and sweeping action of the dust removal brush 38, the dust on the dust collecting electrode plate 35 can be pushed and swept into the dust collection bin 04.

[0062] Preferably, in an embodiment of the present invention,

[0063] The corona electrode control branch 21 in the embodiment of the present invention may specifically include a first bridge arm 101 provided with an IGBT module; the IGBT module can switch on and off the corona electrode branch circuit according to a control electrical signal;

[0064] The polarity control branch 22 may include a plurality of bridge arms provided with IGBT modules; wherein the second bridge arm 102 and the third bridge arm 103 are connected in series to the positive and negative ends of the power supply circuit 01; the fourth bridge arm 104 and the fifth bridge arm 105 are connected in series to the positive and negative ends of the power supply circuit 01; the connection point of the second bridge arm 102 and the third bridge arm 103 is connected to one end of the dust collecting electrode plate 35, and the connection point of the fourth bridge arm 104 and the fifth bridge arm 105 is connected to the other end of the dust collecting electrode plate 35. By changing the positive and negative poles at both ends of the dust collecting electrode plate 35, the circuit polarity of the dust collecting electrode plate 35 can be changed.

[0065] When the electrostatic precipitator is in the dust removal working state (i.e., performing dust adsorption), the generated control electrical signal controls the state of the IGBT module of each bridge arm as follows:

[0066] The IGBT module of the first bridge arm 101 is turned on, and the corona electrode 34 is in a powered state;

[0067] The IGBT modules of the second bridge arm 102 and the fifth bridge arm 105 are turned on, and the IGBT modules of the third bridge arm 103 and the fourth bridge arm 104 are turned off;

[0068] When the electrostatic precipitator is switched to dust collection, the generated control electrical signal controls the state of the IGBT modules of each bridge arm as follows:

[0069] The IGBT module of the first bridge arm 101 is disconnected, and the corona electrode 003 is in a non-powered state;

[0070] The IGBT modules of the second bridge arm 102 and the fifth bridge arm 105 are turned on, and the IGBT modules of the third bridge arm 103 and the fourth bridge arm 104 are turned on and then immediately turned off;

[0071] In practical applications, when determining the timing of dust collection based on the monitoring result of the dust adsorption amount on the dust collecting plate 35, the timing of dust collection can be:

[0072] It also includes an adsorption amount monitoring unit (not shown in the figure) for collecting the dust adsorption amount of the dust collecting plate 35 and a processing unit (not shown in the figure) for generating a control electrical signal of the polarity control circuit according to the monitoring information; the adsorption amount monitoring unit includes a sensor group composed of a plurality of photoelectric sensors; and the plurality of photoelectric sensors are arranged on the dust collecting plate 35.

[0073] The processing unit in the embodiment of the present invention can generate control electrical signals of each IGBT module, control instructions of the isolation plate 31 and control instructions of the dust removal brush 38 according to preset rules; wherein the preset rules are used to:

[0074] In the dust adsorption stage: the isolation plate 31 is controlled to be in an open state; the corona electrode 34 is charged with negative polarity and the dust collecting electrode plate 35 is charged with positive polarity through the polarity control circuit;

[0075] When the proportion of photoelectric sensors whose photoelectric signals are blocked in the sensor group exceeds a preset threshold, the dust collection stage is entered, including: closing the isolation plate 31, disconnecting the circuit loop of the corona electrode 34 in the electrostatic precipitator, and converting the circuit polarity of the dust collecting electrode plate 35 to connect to the negative polarity and then disconnecting the circuit loop of the dust collecting electrode plate 35; controlling the dust removal brush 38 to sweep the dust on the dust collecting electrode plate 35 to the dust collection bin 04 through the dust outlet 37.

[0076] To sum up, in the embodiment of the present invention, a partition plate is provided which can divide the cavity of the dust removal bin into an upper cavity and a lower cavity, and the dust collecting electrode plate is horizontally arranged at the bottom of the lower cavity; in this way, when the electrostatic precipitator enters the dust adsorption stage, the dust in the dust removal bin will drop to the lower cavity and be adsorbed on the dust collecting electrode plate at the bottom; when the dust adsorption amount of the dust collecting electrode plate reaches a certain threshold, it enters the dust storage stage, at this time, on the one hand, the lower cavity where the dust is concentrated is isolated from the upper cavity with a very small dust content by closing the partition plate; on the other hand, the corona electrode is also closed and the polarity of the dust collecting electrode plate is instantly converted to eliminate the adsorption force of the dust on the dust collecting electrode plate; in this way, the gas after dust removal in the upper cavity can be discharged from the dust removal bin through the gas outlet, and at the same time, the dust falling on the dust collecting electrode plate is swept into the dust storage bin through the dust outlet by the dust removal brush; when the dust storage stage is completed, it returns to the dust adsorption stage.

[0077] Since the embodiment of the present invention adopts a non-vibrating method when removing dust from the electrode plates and isolates the dust from the gas after dust removal, it can effectively avoid the flying of dust, thus effectively preventing the possibility of dust entering the air outlet, thereby improving the dust removal effect of the electrostatic precipitator.

[0078] Embodiment 2

[0079] Corresponding to the device embodiment in the first embodiment, a control method for an electrostatic precipitator is also provided in the embodiment of the present invention, such as Figure 3 As shown, the steps include:

[0080] S11, controlling the isolation plate to be in an open state to introduce the dust gas into the dust removal bin;

[0081] S12, performing dust adsorption, including: applying negative polarity electricity to the corona electrode through a polarity control circuit, and applying positive polarity electricity to the dust collecting electrode plate;

[0082] S13, when the dust adsorption amount of the dust collecting plate reaches a preset threshold, the isolation plate is closed;

[0083] S14, disconnecting the circuit loop of the corona electrode in the electrostatic precipitator, and immediately disconnecting the circuit loop of the dust collecting electrode plate after converting the circuit polarity of the dust collecting electrode plate to negative polarity electricity;

[0084] S15, the air after dust removal in the upper cavity is discharged from the dust removal bin through the gas outlet, and the dust removal brush is controlled to sweep the dust on the dust collecting plate to the dust collecting bin through the dust outlet.

[0085] In the embodiment of the present invention, the control device used for the electrostatic precipitator is as follows: Figure 1 and Figure 2As shown in the corresponding embodiment, the specific working principle of the embodiment of the present invention includes:

[0086] The control device for the electrostatic precipitator used in the embodiment of the present invention is provided with a partition plate 31 capable of dividing the cavity of the dust removal bin 03 into an upper cavity 32 and a lower cavity 33; the partition plate 31 can be switched between the closed state and the open state through a driving mechanism; Figure 1 and Figure 2 The isolation plate 31 can be specifically divided into two parts, which are respectively hinged on both sides of the dust removal bin (similar to two doors); in this way, the closing and opening of the isolation plate 31 can be controlled like opening and closing a door.

[0087] When the electrostatic precipitator enters the dust removal working state, the isolation plate 31 is opened. At this time, the cavity of the dust removal bin 03 is integrated, and dust adsorption can be performed. The specific method can be:

[0088] The dust gas is introduced into the dust removal bin 03 through the dust gas inlet 36, and then, the corona electrode 34 is negatively charged and the dust collecting electrode plate 35 is positively charged through the polarity control circuit 02; at this time, the dust gas in the dust removal bin 03 will produce a corona phenomenon, and a large number of positive ions and free electrons are generated by breaking down the air. The free electrons move toward the dust collecting electrode under the action of the high-voltage electric field force between the positive and negative electrodes, and collide with the dust particles in the dust removal bin 03 during the process of forced movement, so that the dust particles are charged, and the charged dust particles are affected by the high-voltage electric field force and move toward the dust collecting electrode plate 35 at a certain rate, and are finally adsorbed on the dust collecting electrode plate 35.

[0089] When the dust adsorption amount on the dust collecting plate 35 exceeds a certain threshold, it will affect the subsequent dust adsorption efficiency. Therefore, periodic dust collection is required to clean and collect the dust on the dust collecting plate 35. In practical applications, the timing of dust collection can be determined by estimating a fixed time period based on the actual working conditions, or by monitoring the dust adsorption amount on the dust collecting plate 35.

[0090] In order to prevent the dust generated during the dust collection process from causing secondary pollution to the exhaust air after dust removal, when performing dust collection, the isolation plate 31 must first be closed, so that the cavity of the dust collection bin 03 is divided into an upper cavity 32 and a lower cavity 33; in the upper cavity 32 is the clean air after dust removal, and this part of the clean air can be discharged through the gas outlet; then, since the dust collecting electrode plate 35 adsorbed with dust is in the lower cavity 33, in this way, by disconnecting the circuit loop of the corona electrode in the electrostatic precipitator and converting the circuit polarity of the dust collecting electrode plate to the circuit loop of the dust collecting electrode plate immediately after connecting the negative polarity electricity, the polarity of the dust collecting electrode plate 35 is opposite to that of the previous moment, generating an instantaneous reverse electric field force, thereby eliminating the adsorption force of the dust particles on the dust collecting electrode plate 35 caused by the charge; then, by controlling the pushing and sweeping action of the dust removal brush 38, the dust located on the dust collecting electrode plate 35 can be pushed and swept into the dust collection bin 04.

[0091] Preferably, in an embodiment of the present invention,

[0092] The corona electrode control branch 21 in the embodiment of the present invention may specifically include a first bridge arm 101 provided with an IGBT module; the IGBT module can switch on and off the corona electrode branch circuit according to a control electrical signal;

[0093] The polarity control branch 22 may include multiple bridge arms equipped with IGBT modules; wherein the second bridge arm 102 and the third bridge arm 103 are connected in series and connected between the positive and negative of the power supply circuit 01; the fourth bridge arm 104 and the fifth bridge arm 105 are connected in series and connected between the positive and negative of the power supply circuit 01; the connection point of the second bridge arm 102 and the third bridge arm 103 is connected to one end of the dust collecting plate 35, and the fourth bridge arm 104 and the fifth bridge arm 105 are connected to the other end of the dust collecting plate 35.

[0094] When the electrostatic precipitator is in the dust removal working state (i.e., performing dust adsorption), the generated control electrical signal controls the state of the IGBT module of each bridge arm as follows:

[0095] The IGBT module of the first bridge arm 101 is turned on, and the corona electrode 34 is in a powered state;

[0096] The IGBT modules of the second bridge arm 102 and the fifth bridge arm 105 are turned on, and the IGBT modules of the third bridge arm 103 and the fourth bridge arm 104 are turned off;

[0097] When the electrostatic precipitator is switched to dust collection, the generated control electrical signal controls the state of the IGBT modules of each bridge arm as follows:

[0098] The IGBT module of the first bridge arm 101 is disconnected, and the corona electrode 003 is in a non-powered state;

[0099] The IGBT modules of the second bridge arm 102 and the fifth bridge arm 105 are turned on, and the IGBT modules of the third bridge arm 103 and the fourth bridge arm 104 are turned on and then immediately turned off;

[0100] In practical applications, when determining the timing of dust collection based on the monitoring result of the dust adsorption amount on the dust collecting plate 35, the timing of dust collection can be:

[0101] It also includes an adsorption amount monitoring unit (not shown in the figure) for collecting the dust adsorption amount of the dust collecting plate 35 and a processing unit (not shown in the figure) for generating a control electrical signal of the polarity control circuit according to the monitoring information; the adsorption amount monitoring unit includes a sensor group composed of a plurality of photoelectric sensors; and the plurality of photoelectric sensors are arranged on the dust collecting plate 35.

[0102] The processing unit in the embodiment of the present invention can generate control electrical signals of each IGBT module, control instructions of the isolation plate 31 and control instructions of the dust removal brush 38 according to preset rules; wherein the preset rules are used to:

[0103] In the dust adsorption stage: the isolation plate 31 is controlled to be in an open state; the corona electrode 34 is charged with negative polarity and the dust collecting electrode plate 35 is charged with positive polarity through the polarity control circuit;

[0104] When the proportion of photoelectric sensors whose photoelectric signals are blocked in the sensor group exceeds a preset threshold, the dust collection stage is entered, including: closing the isolation plate 31, disconnecting the circuit loop of the corona electrode 34 in the electrostatic precipitator, and converting the circuit polarity of the dust collecting electrode plate 35 to connect to the negative polarity and then disconnecting the circuit loop of the dust collecting electrode plate 35; controlling the dust removal brush 38 to sweep the dust on the dust collecting electrode plate 35 to the dust collection bin 04 through the dust outlet 37.

[0105] To summarize, in the embodiment of the present invention, when the electrostatic precipitator enters the dust adsorption stage, the isolation plate is opened, and the dust in the dust removal bin will drop to the lower cavity and be adsorbed on the dust collecting plate at the bottom; when the dust adsorption amount of the dust collecting plate reaches a certain threshold, it enters the dust storage stage. At this time, on the one hand, the lower cavity where the dust is concentrated is isolated from the upper cavity with a very small dust content by closing the isolation plate; on the other hand, the corona electrode is closed and the polarity of the dust collecting plate is instantly converted to eliminate the adsorption force of the dust on the dust collecting plate; in this way, the gas after dust removal in the upper cavity can be discharged from the dust removal bin through the gas outlet, and at the same time, the dust falling on the dust collecting plate is swept into the dust storage bin through the dust outlet by a dust removal brush; when the dust storage stage is completed, it returns to the dust adsorption stage.

[0106] Since the embodiment of the present invention adopts a non-vibrating method when removing dust from the plate, and isolates the dust from the gas after dust removal, it can effectively prevent the dust from flying, thus effectively preventing the possibility of dust entering the gas outlet; thereby improving the dust removal effect of the electrostatic precipitator

[0107] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0108] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0109] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0110] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage device, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage device includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), ReRAM, MRAM, PCM, NAND Flash, NOR Flash, Memristor, disk or optical disk and other media that can store program codes.

[0111] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control device for an electrostatic precipitator, characterized in that: include: Power supply circuit, polarity control circuit, dust removal bin and dust storage bin; An openable and closable isolation plate is arranged in the dust removal bin; When the isolation plate is closed, the cavity of the dust removal bin is divided into an upper cavity and a lower cavity; the vertically arranged corona electrode is located in the upper cavity; the horizontally arranged dust collecting electrode plate is located at the bottom of the lower cavity; the dust gas inlet connected to the dust removal bin is arranged at the lower part of the upper cavity; the dust outlet for connecting to the dust collecting bin is arranged at the lower part of the lower cavity; the dust collecting electrode plate is provided with a dust brush for sweeping dust; The corona electrode and the dust collecting electrode plate are respectively connected in parallel to a power supply circuit through their respective connection ports; The polarity control circuit includes a corona electrode control branch and a polarity control branch; the corona electrode control branch is used to control the on and off of the corona electrode branch circuit according to the control electrical signal; the polarity control branch is used to control the electrification polarity of the dust collecting electrode plate according to the control electrical signal.

2. The control device for an electrostatic precipitator according to claim 1, characterized in that: The power supply circuit comprises: The industrial frequency power supply interface, the rectifier circuit, the high frequency inverter, the transformer, the high frequency rectifier circuit and the filter are connected in sequence.

3. The control device for an electrostatic precipitator according to claim 2, characterized in that: The corona electrode control branch comprises: A first bridge arm of an IGBT module is provided; the IGBT module can switch on and off the corona pole branch circuit according to a control electrical signal.

4. The control device for an electrostatic precipitator according to claim 3, characterized in that: The polarity control branch includes a plurality of bridge arms provided with IGBT modules, including: The second bridge arm and the third bridge arm are connected in series and connected between the positive and negative ends of the power supply circuit; the fourth bridge arm and the fifth bridge arm are connected in series and connected between the positive and negative ends of the power supply circuit; The connection point of the second bridge arm and the third bridge arm is connected to the circuit at one end of the dust collecting plate, and the connection point of the fourth bridge arm and the fifth bridge arm is connected to the circuit at the other end of the dust collecting plate.

5. The control device for an electrostatic precipitator according to claim 4, characterized in that: Also includes: An adsorption monitoring unit for collecting dust adsorption of dust collecting plates, and a processing unit for generating a control electrical signal of the polarity control circuit according to the monitoring information.

6. The control device for an electrostatic precipitator according to claim 5, characterized in that: The adsorption amount monitoring unit includes a sensor group consisting of a plurality of photoelectric sensors; the photoelectric sensors are arranged on the dust collecting plate.

7. The control device for an electrostatic precipitator according to claim 6, characterized in that: The processing unit comprises: Generate control electrical signals for each IGBT module, control instructions for the isolation plate, and control instructions for the dust removal brush according to preset rules; the preset rules are used to: During the dust adsorption stage: Control the isolation plate to be in an open state; pass negative polarity electricity to the corona electrode through the polarity control circuit, and pass positive polarity electricity to the dust collecting electrode plate; During the dust collection stage: When the proportion of photoelectric sensors whose photoelectric signals are blocked in the sensor group exceeds a preset threshold, the isolation plate is closed, the circuit loop of the corona electrode in the electrostatic precipitator is disconnected, and the circuit polarity of the dust collecting plate is converted to negative polarity and then the circuit loop of the dust collecting plate is disconnected; the dust removal brush is controlled to sweep the dust on the dust collecting plate to the dust storage bin through the dust outlet.

8. A control method for an electrostatic precipitator, applicable to the control device as claimed in any one of claims 1 to 6, characterized in that: Includes steps: S11, controlling the isolation plate to be in an open state to introduce the dust gas into the dust removal bin; S12, performing dust adsorption, including: applying negative polarity electricity to the corona electrode through a polarity control circuit, and applying positive polarity electricity to the dust collecting electrode plate; S13, when the dust adsorption amount of the dust collecting plate reaches a preset threshold, the isolation plate is closed; S14, disconnecting the circuit loop of the corona electrode in the electrostatic precipitator, and immediately disconnecting the circuit loop of the dust collecting electrode plate after converting the circuit polarity of the dust collecting electrode plate to negative polarity electricity; S15, the air after dust removal in the upper cavity is discharged from the dust removal bin through the gas outlet, and the dust removal brush is controlled to sweep the dust on the dust collecting plate to the dust collecting bin through the dust outlet.

9. The control method for an electrostatic precipitator according to claim 8, characterized in that: include: The IGBT module is used as a circuit switch to realize the circuit loop of the corona electrode and to change the circuit polarity of the dust collecting electrode.

10. The control method for an electrostatic precipitator according to claim 9, characterized in that: Determine the dust adsorption capacity of the dust collecting plate, including: Acquire photoelectric signals collected by multiple photoelectric sensors in a sensor group arranged on the dust collecting plate; The dust adsorption capacity of the dust collecting plate is determined according to the proportion of the photoelectric sensors whose photoelectric signals are blocked in the sensor group.

11. The control method for an electrostatic precipitator according to claim 10, characterized in that: The method of passing negative polarity electricity to the corona electrode and positive polarity electricity to the dust collecting electrode plate through the polarity control circuit comprises: The first bridge arm, the second bridge arm and the fifth bridge arm are turned on, and the third bridge arm and the fourth bridge arm are turned off.

12. The control method for an electrostatic precipitator according to claim 11, characterized in that: The method of disconnecting the circuit loop of the corona electrode in the electrostatic precipitator and immediately disconnecting the circuit loop of the dust collecting electrode plate after converting the circuit polarity of the dust collecting electrode plate to negative polarity electricity comprises: The first bridge arm, the second bridge arm and the fifth bridge arm are turned off, and the third bridge arm and the fourth bridge arm are turned on momentarily and then turned off immediately.

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