Wet-type electric dust collector with front and rear partitioned inverter electric field

Abstract

The utility model provides a wet type electric dust collector of inverter flow electric field with front and back partition, including air inlet tank, casing, one to two inverter flow electric fields and air outlet tank, the inverter flow electric field includes inverter flow electric field front area and inverter flow electric field rear area, and is equipped with the inverter flow electric field front area spray set, inverter flow electric field rear area spray set respectively with inverter flow electric field front, rear area correspondingly setting, the inverter flow electric field front area includes a plurality of front area cathode line groups and a plurality of front area through -type anode plate rows of interval arrangement, and the inverter flow electric field rear area includes a plurality of rear area cathode line groups and a plurality of rear area through -type anode plate rows of interval arrangement, and is provided with a piece of water mist barrier plate that stands on the boundary line between the inverter flow electric field front area and inverter flow electric field rear area, a plurality of front area cathode line groups and a plurality of rear area cathode line groups are connected with the negative high -voltage output end of inverter flow electric field front, rear area high -voltage power supply device respectively.

Description

Technical Field

[0001] This utility model relates to the field of electrostatic precipitators, and more particularly to a wet electrostatic precipitator with a front and rear partitioned inverter electric field. Background Technology

[0002] In common wet electrostatic precipitators, charged dust particles flowing with the airflow within their plate-and-wire electric field are captured by the electric field force and can flow downwards through a water film distributed on the electrode surface, falling into the dust hopper. Therefore, unlike dry electrostatic precipitators, they do not generate secondary dust during electrode cleaning, thus improving dust removal efficiency. Under the same conditions of dust-laden airflow parameters, spray device, electrode configuration, effective cross-sectional area of ​​the electric field, and effective length of the electric field, although the dust-laden electric field of a wet electrostatic precipitator has a stronger dust-capturing ability than a single ordinary plate-and-wire electric field in a common dry electrostatic precipitator, its PM2.5 capture efficiency is still relatively low. Therefore, wet electrostatic precipitators with front and rear partitions in the inverter electric field structure have been developed. In this type of wet electrostatic precipitator, each inverter electric field has a labyrinthine structure. In the front zone of this inverter current electric field, several front zone air inlet channels and several front zone air outlet channels are arranged alternately. Each front zone air outlet channel has a front baffle plate at its front end, and each front zone air inlet channel has an airflow blocking plate at its rear end—to seal the end of each front zone air inlet channel, thereby preventing dust-laden airflow from flowing directly from the front zone air inlet channel into the rear zone air outlet channel located directly behind it. In the rear zone of this inverter current electric field, several rear zone air inlet channels and several rear zone air outlet channels are arranged alternately. Each rear zone air inlet channel is unobstructed by a front zone air outlet channel located directly in front of it, and each rear zone air inlet channel has a rear zone baffle plate at its rear end.

[0003] In the inverter current electric field of this wet electrostatic precipitator, any airflow entering a front zone inlet channel flows towards the rear end of that inlet channel while simultaneously branching off into multiple narrow airflow channels within one (or two) front zone transparent anode plate arrays located on one side (or on either side). Furthermore, each small stream of airflow entering these narrow airflow channels will flow into one (or two) adjacent front zone outlet channels at an obtuse angle to the direction of the dust-laden airflow at the outlet of the corresponding narrow airflow channel, and then exit into that one (or two) front zone outlet channels. The airflow flows out of the channel until it enters the inlet of one (or two) rear air inlet channels that are open to it; then, the airflow entering any of the above rear air inlet channels flows forward while being diverted to multiple narrow airflow channels in the two rear airflow channels located on both sides of it. Moreover, each small stream of airflow entering those narrow airflow channels will flow into the two rear air outlet channels adjacent to the rear air inlet channel in the form of an obtuse angle between the direction of the dust-laden airflow at the outlet of the corresponding narrow airflow channel and the direction of the dust-laden airflow at the inlet of the rear air inlet channel, and flow towards the outlet of the two rear air outlet channels until it exits the two rear air outlet channels.

[0004] In the inverter electric field of this type of wet electrostatic precipitator, when the airflow moves to the left (or right) side of any of the front or rear inlet channels of the inverter electric field, without considering the gravity of the dust particles, the resultant force is obtained by adding the wind force and the electric field force vector of each charged dust particle in the airflow. Because the component of this resultant force in the direction of the electric field force is significantly greater than the electric field force itself, its effective induction velocity can be significantly increased. In addition, as the airflow passes through the labyrinthine structure of the inverter electric field in the front and rear sections, the airflow velocity changes abruptly five times, thus enhancing the effect of the charged dust particles separating from the airflow due to inertia. Therefore, this inverter electric field with a front-and-back partitioned structure has a strong ability to capture charged dust. Moreover, under the same conditions of dust-laden airflow parameters, spray device, electrode configuration, effective cross-sectional area of ​​the electric field, and effective length of the electric field, the dust removal efficiency of such an inverter electric field with a front-and-back partitioned structure is equivalent to that of two ordinary plate-wire electric fields connected in series in a common wet electrostatic precipitator. Therefore, compared with common wet electrostatic precipitators, this type of wet electrostatic precipitator has a higher dust removal efficiency and a lower dust concentration in its outlet airflow.

[0005] However, people still urgently hope to further enhance the ability of the inverter electric field of this wet electrostatic precipitator to capture charged dust, so as to further improve the dust removal efficiency of this wet electrostatic precipitator and reduce the dust concentration in its outlet airflow, thereby meeting people's growing need for a beautiful ecological environment. Utility Model Content

[0006] The purpose of this invention is to provide a wet electrostatic precipitator with a front and rear partitioned inverter electric field. By implementing partitioned power supply to the inverter electric field and correspondingly using a spray device in the front and / or rear partitions of the inverter electric field to spray the plates and wires of the front and / or rear partitions, the front and rear partitions of the inverter electric field are each operated in their optimal state. This significantly improves their respective operating voltage and the dust removal efficiency of the inverter electric field, thereby enabling the wet electrostatic precipitator to operate efficiently and stably throughout the day and significantly reducing the maximum instantaneous and daily average dust concentration of the outlet airflow.

[0007] Therefore, the present invention adopts the following technical solution:

[0008] A wet electrostatic precipitator with front and rear partitioned inverter electric fields includes an inlet box, a shell, and an outlet box, and further includes one or two inverter electric fields. The inverter electric fields comprise a front inverter electric field region and a rear inverter electric field region, and are equipped with front and rear inverter electric field spray devices respectively corresponding to the front and rear inverter electric field regions. The front inverter electric field region includes multiple alternating front cathode wire groups and multiple alternating front transparent anode plate rows, while the rear inverter electric field region includes multiple alternating rear cathode wire groups and multiple alternating rear transparent anode plate rows. Each front zone cathode wire group is not electrically connected to any rear zone cathode wire group. The upper rear end of each front zone transparent anode plate row and the upper front end of each rear zone transparent anode plate row are fixedly connected to the bottom end of a water mist barrier plate with a height between 500mm and 1000mm, which is located on the dividing line between the front zone and the rear zone of the inverter electric field and is fixedly connected to the left and right side plates of the housing, respectively. This is to prevent the water mist sprayed by the front zone spraying device and the rear zone spraying device of the inverter electric field from entering the rear zone and the front zone of the inverter electric field, respectively.

[0009] The multiple front cathode wire groups and the multiple rear cathode wire groups are respectively electrically connected to the negative high voltage output terminal of the inverter electric field front high voltage power supply device and the negative high voltage output terminal of the inverter electric field rear high voltage power supply device, and the discharge performance of the front cathode wire in the front cathode wire group is stronger than that of the rear cathode wire in the rear cathode wire group.

[0010] Preferably, both the high-voltage power supply device in the front region of the inverter electric field and the high-voltage power supply device in the rear region of the inverter electric field are frequency converters.

[0011] Preferably, the front cathode wire in the front cathode wire group and the rear cathode wire in the rear cathode wire group are respectively tubular barbed wire and straight fishbone needle wire, or respectively straight fishbone needle wire and CS10A needle wire, or respectively straight fishbone needle wire and serrated wire, or respectively CS10A needle wire and CS10B needle wire, or respectively serrated wire and V0 wire.

[0012] Preferably, the front-area transparent anode plate row includes a front-area electrode plate fixing frame and multiple front-area anode plates installed therein in a grid-like manner, while the rear-area transparent anode plate row includes a rear-area electrode plate fixing frame and multiple rear-area anode plates installed therein in a grid-like manner. Both the front-area anode plate and the rear-area anode plate include an electrode plate main part and an electrode plate left-side curved part and / or electrode plate right-side curved part integrated therewith. Moreover, the cross-sectional dimensions of the front-area anode plate are the same as those of the rear-area anode plate.

[0013] Preferably, the cross-sections of the front anode plate and the rear anode plate are both trapezoidal grooves, or both are integral symbols ∫, or both are F-shaped;

[0014] In the front-area transparent anode plate array, the distance between the main plates of any two adjacent front-area anode plates is between 41mm and 55mm; in the rear-area transparent anode plate array, the distance between the main plates of any two adjacent rear-area anode plates is between 31mm and 40mm, or is equal to the distance between the main plates of any two adjacent front-area anode plates in the front-area transparent anode plate array.

[0015] Preferably, the angle between the air inlet end and the air outlet end of the main part of the front anode plate and the dust-laden airflow direction at the outlet of the front air outlet channel of the inverter electric field is between 100° and 130°.

[0016] The angle between the direction of the air inlet end to the air outlet end of the main part of the anode plate in the rear region and the direction of the dust-laden airflow at the inlet of the rear air inlet channel of the inverter electric field is also between 100° and 130°.

[0017] Preferably, the front zone transparent anode plate array, the rear zone transparent anode plate array, the water mist barrier plate, the front zone cathode wire, and the rear zone cathode wire are all made of 316L stainless steel or duplex stainless steel.

[0018] Preferably, the inverter electric field front zone spray device includes a front zone spray main pipe connected to the water inlet main pipe of the spray device and multiple front zone spray branch pipes connected thereto, as well as a front zone spray electric control valve installed on the front zone spray main pipe and located upstream of the multiple front zone spray branch pipes, wherein each front zone spray branch pipe is provided with multiple front zone nozzles located above each of the front zone transparent anode plate rows at intervals;

[0019] The inverter electric field back zone spray device includes a back zone spray main pipe connected to the water inlet main pipe of the spray device and multiple back zone spray branch pipes connected thereto, as well as a back zone spray electric control valve installed on the back zone spray main pipe and located upstream of the multiple back zone spray branch pipes, wherein each back zone spray branch pipe is provided with multiple back zone nozzles located above each of the back zone transparent anode plate rows.

[0020] Preferably, the discharge capability of the front cathode line of the preceding inverter electric field is stronger than that of the front cathode line of the following inverter electric field, and the discharge capability of the rear cathode line of the preceding inverter electric field is stronger than that of the rear cathode line of the following inverter electric field.

[0021] In any of the inverter electric fields of the wet electrostatic precipitator with front and rear partitioned inverter electric fields provided by this utility model, which adopts a partitioned power supply method, the front cathode wire group and the front transparent anode plate row in the front zone of the inverter electric field have respectively adsorbed a portion of the positively charged dust and a portion of the negatively charged dust in the dust-laden airflow. As a result, the average dust concentration in the airflow in the rear zone of the inverter electric field is significantly lower than that in the front zone of the inverter electric field. In addition, the operation of the front zone and the rear zone of the inverter electric field do not affect each other, and their lengths in the shell length direction are only about half the length of the inverter electric field in the shell length direction. This results in a relatively small difference in the dust concentration of the inlet and outlet airflow of each electric field partition, thus enabling each set of high-voltage power supply devices to be better matched with the corresponding electric field partition.

[0022] Therefore, considering the influence of airflow dust concentration within the electric field partition on corona current and electric field strength, it can be seen that the operating voltage of the rear region of the inverter electric field is significantly higher than that of the front region. Furthermore, compared to the operating voltage of the inverter electric field without partitioned power supply, the operating voltage of the front region is also relatively high. Additionally, because the discharge characteristic of the front cathode line in the front region of the inverter electric field is stronger than that of the rear cathode line in the rear region within the same inverter electric field, the operating voltage of the rear region can be further increased. In short, the partitioned power supply technology of the inverter electric field can significantly improve the operating voltage and dust removal efficiency of each electric field partition, thereby significantly improving the dust removal efficiency of the wet electrostatic precipitator and reducing the dust concentration in its outlet airflow.

[0023] Furthermore, when both the inverter electric field front zone spray device and the inverter electric field rear zone spray device adopt the continuous spray working mode, they are used to continuously and uninterruptedly spray the plates and wires of the inverter electric field front zone and the inverter electric field rear zone respectively, thereby enabling the wet electrostatic precipitator to operate continuously, efficiently and stably.

[0024] When both the inverter electric field front zone spray device and the inverter electric field rear zone spray device adopt the intermittent spray working mode, and it is necessary to periodically and intermittently spray the plates and wires of the inverter electric field front zone and / or the inverter electric field rear zone, the inverter electric field front zone spray device and / or the independent inverter electric field rear zone spray device are used to periodically and intermittently spray the plates and wires individually or sequentially. Because the water mist barrier can prevent a portion of the water mist sprayed by the spraying device in the front or rear zone of the inverter electric field from crossing the boundary line and entering the rear or front zone of the inverter electric field, as long as the front or rear zone of the inverter electric field operates at reduced voltage, the rear or front zone of the inverter electric field can continue to operate normally. This avoids a significant short-term decrease in the dust removal efficiency of the inverter electric field caused by spraying any electric field zone of the inverter electric field, which in turn significantly reduces the maximum instantaneous value and daily average value of the dust concentration in the outlet airflow of the wet electrostatic precipitator.

[0025] When the front and rear spray devices of the inverter electric field adopt continuous spraying and intermittent spraying modes respectively, the former is used to continuously spray the plates and wires of the front zone of the inverter electric field, and the latter is used to periodically spray the plates and wires of the rear zone of the inverter electric field. Because the water mist barrier plate can prevent a portion of the water mist sprayed by the front zone spray device from crossing the boundary line and entering the rear zone of the inverter electric field, the front zone of the inverter electric field always needs to operate with reduced voltage, while the rear zone only needs to operate with reduced voltage when the rear zone spray device is spraying. This allows the wet electrostatic precipitator to operate continuously, efficiently, and stably, and significantly reduces the maximum instantaneous value and daily average value of dust concentration in its outlet airflow.

[0026] In summary, in the wet electrostatic precipitator with front and rear partitioned inverter electric fields provided by this utility model, a rear cathode line with weaker discharge characteristics than the front cathode line is set in the rear region of the inverter electric field, and the inverter electric field is powered by partitions. The plates and electrodes of the front and rear regions of the inverter electric field are continuously sprayed, or the plates and electrodes of any one electric field partition of the inverter electric field are periodically sprayed, or the plates and electrodes of the front and rear regions of the inverter electric field are periodically sprayed in sequence. Therefore, whether from the perspective of dust collection or spray cleaning, the front and rear regions of the inverter electric field are independent of each other, and each can operate at its optimal state—thus significantly improving their respective operating voltage and dust removal efficiency, thereby significantly improving the dust removal efficiency of the inverter electric field and the wet electrostatic precipitator; moreover, when both the front and rear spray devices of the inverter electric field adopt an intermittent spraying mode, and each electric field zone of the inverter electric field is individually or sequentially... When the plates and wires of each electric field zone are periodically and intermittently sprayed, it can also avoid the short-term significant drop in the operating voltage and dust removal efficiency of each electric field zone of the inverter electric field caused by the periodic and intermittent spraying of the plates and wires of each electric field zone of the inverter electric field. In other words, it can also prevent the short-term significant increase in the dust concentration of the outlet airflow of the wet electrostatic precipitator caused by the periodic and intermittent spraying of the various electric field zones of the inverter electric field, thereby further reducing the maximum instantaneous value and daily average value of the dust concentration of the outlet airflow.

[0027] Furthermore, because the front and rear zones of the inverter electric field are powered separately by their respective high-voltage power supply devices, if a short circuit occurs in the front (or rear) zone due to the breakage of a cathode wire, it is not necessary to immediately shut down the entire inverter electric field as in existing inverter electric fields that use a front-and-rear partitioned structure but not a partitioned power supply method. Instead, as long as the front (or rear) zone of the inverter electric field stops operating immediately, the rear (or front) zone of the same inverter electric field can continue to operate normally. This avoids a sharp drop in the dust removal efficiency of the wet electrostatic precipitator, or in other words, avoids a sharp increase in the dust concentration in the outlet airflow of the wet electrostatic precipitator.

[0028] Furthermore, when both the high-voltage power supply device in the front zone and the high-voltage power supply device in the rear zone of the inverter electric field are frequency converters, each frequency converter can automatically adjust its operating frequency and modulation according to the operating conditions of the front (or rear) zone of the inverter electric field. Moreover, by automatically adjusting its operating frequency, its output impedance can track the dynamic changes in the operating conditions of the front (or rear) zone of the inverter electric field in real time—for example, during the process of adjusting the spray volume of the spray device from large to small until the spray stops, the characteristics of the dust-laden airflow will change significantly, achieving dynamic optimal matching with the corresponding electric field zone impedance, thereby enabling the... The corresponding electric field zones achieve higher corona power and better power supply characteristics. Furthermore, each frequency converter is highly sensitive to electric sparks and can quickly restore the operating voltage of its corresponding electric field zone, thus improving the average operating voltage of that zone. Moreover, different intermittent power supply ratios can be selected based on the differences in dust resistivity within each electric field zone (note: the dust resistivity in the dust-laden airflow in the rear zone of the inverter electric field is higher than that in the front zone), thereby increasing the peak operating voltage of each electric field zone. This achieves the goal of reducing the specific power consumption of the wet electrostatic precipitator and further improving its dust removal efficiency. In addition, because the frequency converter adopts a structure where the control cabinet and rectifier transformer are separated, and its control cabinet is installed in a well-ventilated dust removal control room, the operational stability of the inverter electric field of the wet electrostatic precipitator is significantly improved, and the frequency converter also offers the advantage of convenient operation and maintenance. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a wet electrostatic precipitator with a front and rear partitioned inverter electric field provided by this utility model.

[0030] Figure 2 yes Figure 1 Enlarged view of a portion of the image (I);

[0031] Figure 3 yes Figure 1Partial enlarged view II therein;

[0032] Figure 4 is a schematic structural diagram of the first inverse current electric field when the cross-sections of the first front and rear area anode plates are both changed to be in the shape of the integral symbol ∫, the schematic structural diagram of the first inverse current electric field;

[0033] Figure 5 is a schematic structural diagram of the first inverse current electric field when the cross-sections of the first front and rear area anode plates are both changed to be in the shape of a factory character, and the first front and rear area cathode wires respectively adopt CS10A needle-punched wires and CS10B needle-punched wires. Detailed implementation manners

[0034] In order to make the purpose and technical solutions of the present utility model clearer, the present utility model will be further described below in conjunction with embodiments.

[0035] As Figures 1-5 shown, a wet electrostatic precipitator with a front and rear partitioned inverse current electric field includes an air inlet box 11, a housing 20, a first inverse current electric field, a second inverse current electric field and an air outlet box 12, as well as a first ash hopper and a second ash hopper not shown in the drawings. The first inverse current electric field includes a first front area of the inverse current electric field and a first rear area of the inverse current electric field, and is equipped with a first front area spraying device of the inverse current electric field and a first rear area spraying device of the inverse current electric field respectively arranged corresponding thereto, while the second inverse current electric field includes a second front area of the inverse current electric field and a second rear area of the inverse current electric field, and is equipped with a second front area spraying device of the inverse current electric field and a second rear area spraying device of the inverse current electric field respectively arranged corresponding thereto. The outlet end of the air inlet box 11 is close to the first inverse current electric field, and the inlet end of the air outlet box 12 is close to the second inverse current electric field. The first front area of the inverse current electric field and the first rear area of the inverse current electric field are respectively powered by a first front area high-voltage power supply device 71 and a first rear area high-voltage power supply device 72 of the inverse current electric field alone, while the second front area of the inverse current electric field and the second rear area of the inverse current electric field are respectively powered by a second front area high-voltage power supply device 73 and a second rear area high-voltage power supply device 74 of the inverse current electric field alone, and the above four sets of high-voltage power supply devices are all variable-frequency power supplies, so as to make the output impedance thereof track the dynamic changes of the operating conditions of the above respective electric field partitions in real time by automatically adjusting the operating frequency of the variable-frequency power supply and achieve dynamic optimal matching with the impedance of the corresponding electric field partition. Therefore, the operating conditions of the first (or second) front area of the inverse current electric field and the first (or second) rear area of the inverse current electric field do not affect each other, so that these two electric field partitions each work in an optimal state, significantly increase their operating voltages, and then significantly improve their dust removal efficiencies and the dust removal efficiency of this wet electrostatic precipitator, especially significantly improve the capture efficiency of the first (or second) rear area of the inverse current electric field for PM2.5 in the dusty gas stream.

[0036] Moreover, if a cathode wire in the front (or rear) region of the first or second inverter electric field breaks, causing a short circuit in the front (or rear) region of the inverter electric field, it is not necessary to immediately shut down the entire first or second inverter electric field as in existing technologies that use a front-and-back partitioned structure but not a partitioned power supply method. Instead, it is only necessary to immediately shut down the front (or rear) region of the inverter electric field, while the rear (or front) region can continue to operate normally. This avoids a sharp drop in the dust removal efficiency of the wet electrostatic precipitator and a sharp increase in the dust concentration in its outlet airflow due to the shutdown of the entire first or second inverter electric field.

[0037] The technical characteristics and functions of the first inverter electric field will be further explained below.

[0038] The first inverter electric field front zone includes nine first front zone cathode wire groups 33, eight first front zone transparent anode plate rows 43, and two first front zone ordinary anode plate rows located on its left and right sides, wherein each first front zone ordinary anode plate row includes four C480 anode plates. All nine first front zone cathode wire groups 33 are electrically connected to the negative high-voltage output terminal of the first inverter electric field front zone high-voltage power supply device 71, and each first front zone cathode wire group 33 is located in the corresponding first front zone air inlet channel or first front zone air outlet channel of the first inverter electric field front zone. The orientation of each first front zone transparent anode plate row 43 and each first front zone ordinary anode plate row is parallel to the symmetrical center line of any first front zone air outlet channel. Each first front zone transparent anode plate row 43 located on the left side of any first front zone air outlet channel is symmetrically distributed with the other first front zone transparent anode plate row 43 located on its right side.

[0039] The first inverter electric field rear zone includes nine first rear zone cathode wire groups 34, eight first rear zone transparent anode plate rows 44, and two first rear zone ordinary anode plate rows located on its left and right sides, wherein each first rear zone ordinary anode plate row includes four C480 anode plates. All nine first rear zone cathode wire groups 34 are electrically connected to the negative high-voltage output terminal of the first inverter electric field rear zone high-voltage power supply device 72, and each first rear zone cathode wire group 34 is located in the corresponding first rear zone air inlet channel or first rear zone air outlet channel of the first inverter electric field rear zone. The arrangement direction of each first rear zone transparent anode plate row 44 and each first rear zone ordinary anode plate row is parallel to the symmetrical center line of any first rear zone air inlet channel. Each first rear zone transparent anode plate row 44 located on the left side of any first rear zone air inlet channel is symmetrically distributed with the other first rear zone transparent anode plate row 44 located on its right side. It should be further noted that each of the first rear cathode wire groups 34 is not electrically connected to any of the first front cathode wire groups 33; the distance b between any two adjacent first rear cathode wire groups 34 is equal to the distance between any two adjacent first front cathode wire groups 33.

[0040] Each first front-zone cathode wire group 33 includes seven straight-line herringbone needle-punched wires (i.e., first front-zone cathode wires) with a discharge intensity stronger than CS10A needle-punched wires, while each first rear-zone cathode wire group 34 includes seven CS10A needle-punched wires (i.e., first rear-zone cathode wires)—each discharge needle protrudes 10mm from the φ8 round steel, and the tips of the discharge needles are conical, while the main diameter of the discharge needles is 2mm. However, this can be modified as follows: each first front-zone cathode wire group 33 includes four tubular barbed wires (i.e., RS barbed wires), and each first rear-zone cathode wire group 34 includes seven straight-line herringbone needle-punched wires; or the former includes seven straight-line herringbone needle-punched wires, and the latter includes seven serrated wires. Both the first front-zone cathode wires and the first rear-zone cathode wires are made of 316L stainless steel or duplex stainless steel.

[0041] Let's start with... Figure 2Taking a first front zone cathode wire group 33 and a first rear zone cathode wire group 34, which are adjacent to the first front zone ordinary anode plate row and the first rear zone ordinary anode plate row respectively, as examples, the specific positions of each cathode wire in each first front zone cathode wire group 33 and first rear zone cathode wire group 34 in the corresponding front zone ( / or rear zone) air inlet ( / or air outlet) channel are explained. From front to back ( / or from back to front), the first and second cathode wires in the first front zone cathode wire group 33 ( / or first rear zone cathode wire group 34) are matched with the first C480 anode plate in the first front zone ordinary anode plate row ( / or first rear zone ordinary anode plate row), the third and fourth cathode wires are matched with the second C480 anode plate, the fifth and sixth cathode wires are matched with the third C480 anode plate, and the seventh cathode wire is matched with the fourth C480 anode plate. The first half (or the second half) is matched to ensure that the net distance between the 7th cathode wire and the pair of adjacent central inferior arc plates 53 is significantly greater than the net distance between the first front region cathode wire group 33 and the first front region transparent anode plate row 43 (or the net distance between the first rear region cathode wire group 34 and the first rear region transparent anode plate row 44), thereby avoiding the decrease in both the breakdown voltage and the operating voltage of the first inverter electric field front region (or rear region).

[0042] Each first front-area open-type anode plate row 43 includes a first front-area electrode plate fixing frame 431 and multiple first front-area anode plates 432 installed therein in a grid-like manner, while each first rear-area open-type anode plate row 44 includes a first rear-area electrode plate fixing frame 441 and multiple first rear-area anode plates 442 installed therein in a grid-like manner. Both the first front-area anode plate 432 and the first rear-area anode plate 442 can be rolled from thin steel sheet—the material is 316L stainless steel or duplex stainless steel. Both the first front-area anode plate 432 and the first rear-area anode plate 442 include an electrode plate main portion and an integrally formed left-side curved portion and right-side curved portion, and both have a trapezoidal groove cross-section (see...). Figure 2 Moreover, both have the same cross-sectional dimensions.

[0043] In each of the first front zone permeable anode plate rows 43 or the first rear zone permeable anode plate rows 44, the distance F between the main plates of any two adjacent first front zone anode plates 432 or the distance G between the main plates of two first rear zone anode plates 442 is between 41mm and 55mm, for example, 52mm. This is to control the net distance between the left and right curved portions of the anode plates and the left and right curved portions of the anode plates adjacent to the anode plates in the above-mentioned anode plates within an appropriate range, thereby reducing the resistance of the dust-laden airflow through the first front zone permeable anode plate rows 43 or the first rear zone permeable anode plate rows 44.

[0044] Of course, the cross-sections of the first front anode plate 432 and the first rear anode plate 442 can be changed to be in the shape of an integral symbol ∫ (see...). Figure 4 Furthermore, both have the same cross-sectional dimensions—in this case, they both include the main part of the electrode plate and the left and right curved parts of the electrode plate integrated with it, and the distance F between the main parts of any two adjacent first front anode plates and the distance G between the main parts of the electrode plates of the two first rear anode plates are both between 41mm and 55mm, for example, 48mm; or both have cross-sections changed to a C-shape and both have the same cross-sectional dimensions—in this case, they both include the main part of the electrode plate and the left or right curved part of the electrode plate integrated with it, and the distance F between the main parts of any two adjacent first front anode plates and the distance G between the main parts of the electrode plates of the two first rear anode plates are both between 41mm and 55mm (for example, 50mm), and the first front cathode wire in the first front cathode wire group 33 is changed to CS10A needle wire, while the first rear cathode wire in the first rear cathode wire group 34 is changed to CS10B needle wire, see Figure 5 Each discharge needle of the CS10B needle-punching wire has an exposed length of 10mm from the φ8 round steel, and the tip of each discharge needle is made by beveling a cylinder at a 45° angle, while the diameter of the main part of the discharge needle is 2mm.

[0045] When the cross-sections of the first front anode plate 432 and the first rear anode plate 442 are both trapezoidal grooves (or integral symbols ∫, or F-shaped) (see...) Figure 2 and Figures 4-5 The angle α between the direction of the air inlet to the air outlet of the main portion of the first front anode plate 432 and the direction of the dust-laden gas flow at the outlet of the first front air passage is 120° (or angle λ is 105°, or angle ρ is 114°); while the angle β between the direction of the air inlet to the air outlet of the main portion of the first rear transparent anode plate 442 and the direction of the dust-laden gas flow at the inlet of the first rear air passage is 120° (or angle μ is 105°, or angle ψ is 114°). Of course, the aforementioned angles α and β (or angles λ and μ, or angles ρ and ψ) can be changed to any other value between 100° and 130°, such as 110° or 125°. Figures 1-5 In the diagram, each arrow located between the first (or second) front air outlet duct and the first (or second) rear air inlet duct represents the direction of dust-laden airflow at its location.

[0046] Obviously, when the cross-section of the first front anode plate 432 is changed to be in the shape of an integral symbol ∫ or in the shape of a factory (see... Figures 4-5Each first front anode plate 432 with a cross-section in the shape of an integral symbol ∫ includes a main plate portion and a left curved portion and a right curved portion of the plate integrally connected thereto. Each first front anode plate 432 with a cross-section in the shape of a factory character includes a main plate portion and a left curved portion or a right curved portion of the plate integrally connected thereto.

[0047] At the left front or right front of each of the first front zone ordinary anode plate rows, a straight-line side baffle 51 is respectively provided, with its front end welded to the left or right side plate of the housing 20. At the left rear or right rear of each of the first rear zone ordinary anode plate rows, a straight-line side baffle 51 is respectively provided, with its rear end welded to the left or right side plate of the housing 20. At the front end of each first front zone air outlet channel, a V-shaped front baffle 52 is provided; the left and right sides of each V-shaped front baffle 52 are respectively tightly connected to the front rectangular tubes of the two adjacent first front zone electrode plate fixing frames 431, so that the front end of each first front zone air outlet channel is closed, thereby preventing dust-laden airflow from directly flowing into the first front zone air outlet channel from the front of the first inverter current electric field.

[0048] A pair of slightly curved plates 53 are provided at the rear end of each first front zone air inlet channel. Each pair of slightly curved plates 53 includes two plates that stand back-to-back and are fixedly connected. The left and right sides of the plate with the slot facing forward are respectively tightly connected to the rear rectangular tubes of the two adjacent first front zone electrode plate fixing frames 431, or one side is tightly connected to the rear rectangular tube of an adjacent first front zone electrode plate fixing frame 431, while the other side is tightly connected to the rear end of an adjacent first front zone ordinary anode plate array. This ensures that the ends of each first front zone air outlet channel are sealed, thereby preventing dust-laden airflow from directly flowing from the first front zone air inlet channel into the first rear zone air outlet channel located directly behind it. The left and right sides of the plate with the slot facing backward are respectively... It is tightly connected to the front rectangular tubes of the two adjacent first rear zone electrode plate fixing frames 441, or one side of it is tightly connected to the front rectangular tube of the adjacent first rear zone electrode plate fixing frame 441, while the other side is tightly connected to the front end of the adjacent first rear zone ordinary anode plate row. This can prevent dust-laden airflow from entering each first rear zone air outlet channel from the front, and reduce the turbulence intensity of the dust-laden airflow at its front end. This is beneficial for the front end of the first rear zone permeable anode plate row 44 to capture charged dust and charged mist droplets (Note: the water mist sprayed by the first inverter electric field front zone spray device and / or the first inverter electric field rear zone spray device will be charged after entering the first inverter electric field).

[0049] In addition, a slightly curved rear baffle plate 54 with its slot facing forward is provided at the rear end of each of the first rear zone air outlet channels. Each slightly curved rear baffle plate 54 is tightly connected on its left and right sides to the rear rectangular tube ends of the two adjacent first rear zone electrode fixing frames 441. This not only seals the end of the air outlet channel in the rear zone of the first inverter electric field, preventing dust-laden airflow from directly exiting the first inverter electric field from the first rear zone air inlet channel, but also reduces the turbulence intensity of the dust-laden airflow at the rear end of the first rear zone air inlet channel, thus facilitating the capture of charged dust and charged droplets at the rear end of the first rear zone permeable anode plate array 44. It is important to note that the net distance between each slightly curved rear baffle plate 54 and an adjacent first rear zone cathode wire must be significantly greater than the net distance between the first rear zone cathode wire group 34 and the first rear zone permeable anode plate array 44, thereby avoiding a decrease in both the breakdown voltage and operating voltage of the first inverter electric field's rear zone.

[0050] It is worth mentioning that the upper rear end of each of the first front-area transparent anode plate rows 43 and the upper front end of each of the first rear-area transparent anode plate rows 44 are fixedly connected to the bottom end of a water mist barrier plate 55 with a height between 500 and 1000 mm (for example, a height equal to 600 or 900 mm) erected on the boundary line between the first inverter electric field front area and the first inverter electric field rear area. The water mist barrier plate 55 is made of 316L stainless steel or duplex stainless steel, and its left and right ends are fixedly connected to the left and right side plates of the housing 20, respectively, to prevent the first... A portion of the water mist sprayed by the front zone spray device and the rear zone spray device of the first inverter electric field crosses the boundary line and flows into the rear zone and front zone of the first inverter electric field, respectively. This strictly controls the coverage of the water mist sprayed by the front (or rear) zone spray device of the first inverter electric field within the front (or rear) zone of the first inverter electric field, thereby enabling the rear (or front) zone of the first inverter electric field to continue to operate normally, i.e., it does not need to operate with reduced voltage like the front (or rear) zone of the first inverter electric field.

[0051] Under the combined action of the aforementioned straight side baffles 51, V-shaped front baffles 52, central inferior arc plates 53, and inferior arc rear baffles 54, the dust-laden airflow from the air inlet box 1 first flows into each of the first front zone air inlet channels, then passes through multiple narrow channels in the first front zone provided on one or both sides, that is, multiple narrow passages between multiple first front zone anode plates 432 provided on one or both sides of the first front zone permeable anode plate row 43, and enters one or two corresponding first front zone outlets. The airflow then flows directly into one or two first rear zone air inlet channels that are unobstructed by the airflow. The dust-laden airflow then passes through multiple first rear zone narrow channels set on both sides of each first rear zone air inlet channel, that is, multiple narrow passages between multiple first rear zone anode plates 442 set on both sides of the first rear zone transparent anode plate row 44, and enters the corresponding two or four first rear zone air outlet channels. After the dust-laden airflow has been initially dusted by the first inverter current electric field, it flows out from the outlet of these first rear zone air outlet channels.

[0052] The first inverter electric field front zone spray device includes a first front zone spray main pipe 81 connected to the main water inlet pipe 80 of the spray device and four (or five) first front zone spray branch pipes connected to it, and a first front zone spray electric control valve installed on the first front zone spray main pipe 81 and located upstream of these first front zone spray branch pipes. Each first front zone spray branch pipe is in the same plane, and the distance between two adjacent first front zone spray branch pipes is between 400 and 700 mm—for example, about 550 mm. Each of the spray branch pipes is equipped with multiple first front zone nozzles located above each first front zone transparent anode plate row 43. These are solid cone-shaped 90° nozzles, and the distance between two adjacent first front zone nozzles is between 500 and 750 mm (for example, about 550 mm). This allows the spray zone formed when all the first front zone nozzles spray together to fully and completely cover the entire front zone of the first inverter electric field, and allows the captured dust to flow downwards along with the water film distributed on the surface of the anode plate or cathode wire and fall into the first ash hopper.

[0053] The first inverter electric field rear-zone spray device includes a first rear-zone spray main pipe 82 connected to the main water inlet pipe 80 of the spray device and four (or five) first rear-zone spray branch pipes connected to it, and a first rear-zone spray electric control valve installed on the first rear-zone spray main pipe 82 and located upstream of these first rear-zone spray branch pipes. Each first rear-zone spray branch pipe is in the same plane, and the distance between any two adjacent first rear-zone spray branch pipes is between 400 and 700 mm—for example, approximately 550 mm. Furthermore, each first rear zone spray branch pipe is equipped with multiple first rear zone nozzles located above each first rear zone transparent anode plate row 44. These are solid conical 90° nozzles, and the distance between two adjacent first rear zone nozzles is between 400 and 700 mm (for example, about 550 mm). This ensures that when all the first rear zone nozzles spray together, the spray area formed can fully and completely cover the entire rear zone of the first inverter current electric field, and the captured dust flows downward with the water film distributed on the surface of the anode plate or cathode wire and falls into the first ash hopper.

[0054] In addition, the first front zone spray branch pipe, the first rear zone spray branch pipe, the first front zone nozzle and the first rear zone nozzle are all made of PE material or stainless steel; the first front zone spray electric control valve is used to control whether all the first front zone nozzles spray, while the first rear zone spray electric control valve is used to control whether all the first rear zone nozzles spray.

[0055] The operating modes of the first inverter electric field front zone spray device and the first inverter electric field rear zone spray device should be selected according to the humidity of the dust-laden airflow at the inlet of the wet electrostatic precipitator. When the humidity of the dust-laden airflow at the inlet is relatively low (or relatively high), both the first inverter electric field front zone spray device and the first inverter electric field rear zone spray device operate in continuous spray (or intermittent spray) mode; when the humidity of the dust-laden airflow at the inlet is neither low nor high, the first inverter electric field front zone spray device operates in continuous spray mode, while the first inverter electric field rear zone spray device operates in intermittent spray mode.

[0056] When both the spray device in the front zone and the spray device in the rear zone of the first inverter electric field adopt the continuous spraying mode, they are used to continuously spray the plates and wires in the front and rear zones of the first inverter electric field, respectively. This continuously humidifies the airflow in the first inverter electric field and also distributes a uniform and continuous downward-flowing water film on the surface of the anode plate and the cathode wire in the front and rear zones of the first inverter electric field. The captured dust falls into the first ash hopper along with the water film, thereby enabling the front and rear zones of the first inverter electric field to operate continuously, efficiently and stably.

[0057] When the spray devices in the front and rear zones of the first inverter electric field adopt continuous spraying and intermittent spraying modes respectively, the former is used to continuously spray the plates and wires in the front zone of the first inverter electric field, and the latter is used to periodically spray the plates and wires in the rear zone of the first inverter electric field under the premise of reduced voltage operation, so that both the front and rear zones of the first inverter electric field can operate continuously, efficiently and stably.

[0058] When both the first inverter electric field front zone spray device and the first inverter electric field rear zone spray device adopt the intermittent spray working mode, and it is necessary to periodically and intermittently spray the plates and wires of the first inverter electric field front zone (or the first inverter electric field rear zone) separately, under the premise of the first inverter electric field front zone (or the first inverter electric field rear zone) operating at reduced voltage, the first inverter electric field front zone spray device (or the first inverter electric field rear zone spray device) is used to periodically and intermittently spray the plates and wires separately, so that the surface of the anode plate and the surface of the cathode wire are uniformly and continuously distributed with downward flowing water film - and the captured dust falls into the first ash hopper with the water film. Since the upper rear end of each of the first front zone transparent anode plate rows 43 and the upper front end of each of the first rear zone transparent anode plate rows are fixedly connected to the bottom end of a water mist barrier plate 55 erected on the boundary line between the first inverter electric field front zone and the first inverter electric field rear zone, the water mist barrier plate 55 can prevent a portion of the water mist sprayed by the first inverter electric field front zone spray device (or the first inverter electric field rear zone spray device) from crossing the boundary line and rushing into the first inverter electric field rear zone (or the first inverter electric field front zone). This allows the first inverter electric field rear zone (or the first inverter electric field front zone) to continue operating normally, that is, it does not need to operate with reduced voltage like the first inverter electric field front zone (or the first inverter electric field rear zone). This avoids a significant decrease in the dust removal efficiency of the first inverter electric field due to the above-mentioned spraying, and thus avoids the problem of a short-term significant increase in the dust concentration of the outlet airflow of the wet electrostatic precipitator.

[0059] When both the front and rear spray devices of the first inverter electric field operate in intermittent spraying mode, and periodic intermittent spraying is required on the plates and wires of the first inverter electric field, if the front and rear spray devices are used simultaneously to periodically spray the plates and wires of the first inverter electric field, both the front and rear zones of the first inverter electric field should operate with reduced voltage. This results in a significant decrease in voltage in both zones, causing a short-term significant increase in the dust concentration of the outlet airflow of the wet electrostatic precipitator. Furthermore, since the dust concentration of the inlet airflow in the rear zone of the first inverter electric field is significantly lower than that in the front zone, the spraying interval of the rear zone should ideally be longer than that in the front zone. Therefore, this synchronous spraying method also increases the consumption of spray water.

[0060] Therefore, when both the spray device in the front zone and the spray device in the rear zone of the first inverter electric field adopt an intermittent spraying mode, and it is necessary to periodically and intermittently spray the plates and wires in the front and rear zones of the first inverter electric field, under the premise that the front and rear zones of the first inverter electric field are operated with sequential voltage reduction, the spray devices in the front and rear zones of the first inverter electric field are used to periodically and intermittently spray the plates and wires in sequence. This avoids a significant decrease in the dust removal efficiency of the first inverter electric field due to the periodic and intermittent spraying of the plates and wires in the front and rear zones of the first inverter electric field simultaneously, thereby avoiding the problem of a short-term significant increase in the dust concentration of the outlet airflow of the wet electrostatic precipitator.

[0061] As described above, when both the first inverter electric field front zone spray device and the first inverter electric field rear zone spray device adopt the intermittent spraying working mode, and it is necessary to periodically and intermittently spray the plates and wires of the first inverter electric field front zone and / or the first inverter electric field rear zone individually or sequentially, the dust removal efficiency of the first inverter electric field will not decrease significantly, thereby avoiding the problem of a short-term significant increase in the dust concentration of the outlet airflow of the wet electrostatic precipitator. Furthermore, because the first inverter electric field adopts a front and rear partitioned power supply method, the front and rear zones of the first inverter electric field can operate in the best state when their plates and wires are sprayed and when they are not sprayed. Therefore, the first inverter electric field can operate efficiently and stably all day long, thus laying the foundation for the wet electrostatic precipitator to operate efficiently and stably all day long and significantly reduce the maximum instantaneous value and daily average value of dust concentration in its outlet airflow.

[0062] In summary, regardless of whether the first inverter electric field's front and rear spray devices are used to continuously spray the plates and wires of the first inverter electric field's front and rear zones, or whether the first inverter electric field's front zone spray device and / or the first inverter electric field's rear zone spray device are used to periodically spray the plates and wires, individually or sequentially, the first inverter electric field's front and rear zones can each operate at their optimal state when using a front-rear partitioned power supply method. Moreover, using the first inverter electric field spray device and / or the first inverter electric field's rear zone spray device to periodically spray the plates and wires, individually or sequentially, will not cause a short-term significant increase in the dust concentration of the outlet airflow of the wet electrostatic precipitator, as is the case when the first inverter electric field's front and rear zone spray devices simultaneously spray the first inverter electric field's front and rear zones periodically.

[0063] Then, the technical characteristics and functions of the second inverter electric field will be further explained.

[0064] The second inverter electric field front zone includes nine second front zone cathode wire groups 35, eight second front zone transparent anode plate rows 45, and two second front zone ordinary anode plate rows disposed on its left and right sides, wherein each second front zone ordinary anode plate row includes four C480 anode plates. All nine second front zone cathode wire groups 35 are electrically connected to the negative high-voltage output terminal of the second inverter electric field front zone high-voltage power supply device 73, and each second front zone cathode wire group 35 is located in the corresponding second front zone air inlet channel or second front zone air outlet channel of the second inverter electric field front zone. The arrangement direction of each second front zone transparent anode plate row 45 and each second front zone ordinary anode plate row is parallel to the symmetrical center line of any second front zone air outlet channel. Each second front zone transparent anode plate row 45 located on the left side of any second front zone air outlet channel is symmetrically distributed with the other second front zone transparent anode plate row 45 located on its right side.

[0065] The second inverter electric field rear zone includes nine second rear zone cathode wire groups 36, eight second rear zone transparent anode plate rows 46, and two second rear zone ordinary anode plate rows located on its left and right sides. Each second rear zone ordinary anode plate row also includes four C480 anode plates. All nine second rear zone cathode wire groups 36 are electrically connected to the negative high-voltage output terminal of the second inverter electric field rear zone high-voltage power supply device 74, and each second rear zone cathode wire group 36 is located in the corresponding second rear zone air inlet or outlet channel of the second inverter electric field rear zone. The orientation of each second rear zone transparent anode plate row 46 and each second rear zone ordinary anode plate row is parallel to the symmetrical center line of any second rear zone air inlet channel. Each second rear zone transparent anode plate row 46 located on the left side of any second rear zone air inlet channel is symmetrically distributed with the other second rear zone transparent anode plate row 46 located on its right side. It should be further noted that each of the second rear cathode wire groups 36 is not electrically connected to any of the second front cathode wire groups 35; in addition, the distance c between any two adjacent second rear cathode wire groups 36 is equal to the distance between any two adjacent second front cathode wire groups 35, and is also equal to the distance b between any two adjacent first rear cathode wire groups 34.

[0066] Each second front-zone cathode wire group 35 includes seven sawtooth wires (i.e., second front-zone cathode wires) with discharge characteristics significantly weaker than CS10A needle-punched wires, while each second rear-zone cathode wire group 36 includes seven V0 wires (i.e., second rear-zone cathode wires) with discharge characteristics weaker than the sawtooth wires. This is to ensure that the discharge characteristics of the cathode wires in the front zones of the first and second inverter electric fields are stronger than those in the rear zones of the first and second inverter electric fields, respectively, and that the discharge characteristics of the cathode wires in the front and rear zones of the first inverter electric field are stronger than those in the front and rear zones of the second inverter electric field, respectively. On the one hand, the operating voltage and electric field strength of the rear region of the first (or second) inverter electric field are respectively higher than those of the front region of the first (or second) inverter electric field, thereby further improving the dust removal efficiency of the first (or second) inverter electric field. On the other hand, the operating voltage and electric field strength of the front region (or rear region) of the second inverter electric field are respectively significantly higher than those of the front region (or rear region) of the first inverter electric field, thereby further improving the dust removal efficiency of both the first and second inverter electric fields. The cathode wires of the second front region and the second rear region are both made of 316L stainless steel or duplex stainless steel.

[0067] Each cathode wire in each of the second front zone cathode wire group 35 and the second rear zone cathode wire group 36 is arranged in the corresponding front zone ( / or rear zone) air inlet ( / or air outlet) channel, just like each cathode wire in each of the first front zone cathode wire group 33 and the first rear zone cathode wire group 34 (see [reference]). Figures 2-3 In the above two inverter electric fields, the main barbs of the tubular barbed wire, the needle-shaped discharge bodies of the fishbone needle wire, CS10A needle wire, CS10B needle wire and V15 wire, the serrations of the sawtooth wire, and the flat steel of the V0 wire are all parallel to the direction of dust-laden gas flow at the outlet of the first front zone air outlet channel.

[0068] Each second front-area open-type anode plate row 45 includes a second front-area electrode plate fixing frame 451 and multiple second front-area anode plates 452 installed therein in a grid pattern, while each second rear-area open-type anode plate row 46 includes a second rear-area electrode plate fixing frame 461 and multiple second rear-area anode plates 462 installed therein in a grid pattern. Both the second front-area anode plate 452 and the second rear-area anode plate 462 can be rolled from thin steel sheet—the material is also 316L stainless steel or duplex stainless steel. Furthermore, like the first front-area anode plate 432 and the first rear-area anode plate 442, the second front-area anode plate 452 and the second rear-area anode plate 462 include a left-side curved portion and a right-side curved portion of the electrode plate integrally connected to the main electrode plate portion, and both have a trapezoidal groove cross-section (see...). Figures 2-4 Moreover, both have the same cross-sectional dimensions.

[0069] Just as the cross-sections of the first front anode plate 432 and the first rear anode plate 442 are changed to be in the shape of an integral symbol ∫ (or in the shape of a factory), the cross-sections of the second front anode plate 452 and the second rear anode plate 462 can also be changed to be in the shape of an integral symbol ∫ (or in the shape of a factory), and the cross-sectional dimensions of the two anode plates are the same.

[0070] Regardless of whether the cross-section of these two types of anode plates is trapezoidal groove, integral symbol ∫, or F-shaped, in each second front-zone permeable anode plate row 45, the distance f between the main plates of any two adjacent second front-zone anode plates 452 is between 41mm and 55mm (e.g., 43mm or 48mm). In each second rear-zone permeable anode plate row 46, the distance g between the main plates of any two adjacent second rear-zone anode plates 462 is between 31mm and 40mm (e.g., 35mm), further improving the PM2.5 capture efficiency of each second rear-zone permeable anode plate row 46 for dust-laden airflow. However, provided that the dust concentration in the outlet airflow of the wet electrostatic precipitator meets its design requirements, this distance g can also be changed to be equal to the aforementioned distance f to reduce the resistance of the airflow through the second rear-zone permeable anode plate row 46.

[0071] Furthermore, regardless of whether the cross-section of these two types of anode plates is trapezoidal groove, integral symbol ∫, or F-shaped, the angle γ between the setting direction of the air inlet end to the air outlet end of the main part of the second front zone anode plate 452 and the direction of the dust-laden gas flow at the outlet of the second front zone air outlet channel is 120°; while the angle θ between the setting direction of the air inlet end to the air outlet end of the main part of the second rear zone permeable anode plate 462 and the direction of the dust-laden gas flow at the inlet of the second rear zone air inlet channel is 120° (see...). Figure 3 Of course, the included angles γ and θ can be changed to any other value between 100° and 130°, such as 105° or 125°.

[0072] Similar to the first inverter electric field, the second inverter electric field also includes four straight side baffles 51, four V-shaped front baffles 52, five pairs of centrally curved plates 53, four centrally curved rear baffles 54, and one water mist barrier 55. Furthermore, the connection methods of each of these baffles to the side plates of the housing 20, the second front-area transparent anode plate row 45, or the second rear-area transparent anode plate row 46 are the same as their connection methods to the side plates of the housing 20, the first front-area transparent anode plate row 43, or the first rear-area transparent anode plate row 44. Therefore, the functions of each straight side baffle 51, V-shaped front baffle 52, centrally curved rear baffle 54, and each pair of centrally curved plates 53, as well as the water mist barrier 55, in the second inverter electric field are the same as their functions in the first inverter electric field.

[0073] As described above, the four types of anode plates—the first front anode plate 432, the first rear anode plate 442, the second front anode plate 452, and the second rear anode plate 462—have the same structure. Furthermore, the structures of the second front-area transparent anode plate array 45 and the second rear-area transparent anode plate array 46 are essentially the same as those of the first front-area transparent anode plate array 43 and the first rear-area transparent anode plate array 44, respectively. In addition, the environments in which the former two are located are roughly the same as those in which the latter two are located. Therefore, the roles played by the former two in the second inverter electric field are essentially the same as the roles played by the latter two in the first inverter electric field.

[0074] Within the second inverter current electric field, under the combined action of the straight side baffles 51, the V-shaped front baffles 52, the middle inferior arc plates 53, and the inferior arc rear zone baffles 54, the dust-laden airflow treated by the first inverter current electric field first flows into each of the second front zone air inlet channels, then passes through multiple narrow channels of the second front zone set on one or both sides, enters the corresponding second front zone air outlet channel, then flows directly into one or two second rear zone air inlet channels that are unobstructed with it, then passes through multiple narrow channels of the second rear zone set on both sides, enters the corresponding two or four second rear zone air outlet channels, and then flows out from the outlets of these second rear zone air outlet channels—finally, the airflow further dust-removed by the second inverter current electric field is discharged from the wet electrostatic precipitator through the air outlet box 12.

[0075] The second inverter electric field front zone spray device includes a second front zone spray main pipe 83 connected to the main water inlet pipe 80 of the spray device and four (or five) second front zone spray branch pipes connected to it, and a second front zone spray electric control valve installed on the second front zone spray main pipe 83 and located upstream of these second front zone spray branch pipes. Each second rear zone spray branch pipe and each second front zone spray branch pipe are in the same plane, and the distance between two adjacent second front zone spray branch pipes is between 400 and 700 mm—for example, around 550 mm. Furthermore, each second front zone spray branch pipe is equipped with multiple second front zone nozzles located above each second front zone transparent anode plate row 45. These are solid cone-shaped 90° nozzles, and the distance between two adjacent second front zone nozzles is between 500 and 750 mm (for example, about 550 mm). This ensures that when all the second front zone nozzles spray together, the spray zone formed can fully and completely cover the entire front zone of the second inverter electric field, and the captured dust flows downward with the water film distributed on the surface of the anode plate or cathode wire and falls into the second ash hopper.

[0076] The second inverter electric field rear zone spray device includes a second rear zone spray main pipe 84 connected to the main water inlet pipe 80 of the spray device and four (or five) second rear zone spray branch pipes connected to it, and a second rear zone spray electric control valve installed on the second rear zone spray main pipe 84 and located upstream of these second rear zone spray branch pipes. Each second rear zone spray branch pipe and each second front zone spray branch pipe are in the same plane, and the distance between two adjacent second rear zone spray branch pipes is between 400 and 700 mm—for example, about 550 mm. Each of the second rear zone spray branch pipes is equipped with multiple second rear zone nozzles located above each second rear zone transparent anode plate row 46. These are solid conical 90° nozzles, and the distance between two adjacent second rear zone nozzles is between 400 and 700 mm, for example, about 550 mm. This ensures that when all the second rear zone nozzles spray together, the spray area formed can fully and completely cover the entire rear zone of the second inverter electric field, and the captured dust flows downward with the water film distributed on the surface of the anode plate or cathode wire and falls into the second ash hopper.

[0077] In addition, the second front zone spray branch pipe, the second rear zone spray branch pipe, the second front zone nozzle, and the second rear zone nozzle are all made of PE material or stainless steel; the second front zone spray electric control valve is used to control whether all the second front zone nozzles spray, and the second rear zone spray electric control valve is used to control whether all the second rear zone nozzles spray.

[0078] After the wet electrostatic precipitator is put into operation, even when the humidity of the inlet airflow is relatively low, the continuous and uninterrupted spraying of the electrodes and wires in the front and rear zones of the first inverter electric field by the spray devices in those zones simultaneously humidifies the airflow within the first inverter electric field. This results in an increase in the humidity of the dust-laden airflow at the outlet of the first inverter electric field. Therefore, both the front and rear spray devices of the second inverter electric field can employ intermittent spraying. The operating mode is similar to that of the first inverter electric field front zone spray device and the first inverter electric field rear zone spray device. When periodic intermittent spraying is required on the second inverter electric field front zone and / or the second inverter electric field rear zone, the periodic intermittent spraying using the second inverter electric field front zone spray device and / or the second inverter electric field rear zone spray device individually or sequentially will not cause a significant decrease in the dust removal efficiency of the second inverter electric field, nor will it cause a short-term significant increase in the dust concentration of the outlet airflow of the wet electrostatic precipitator. Furthermore, because the second inverter electric field adopts a front and rear zone power supply method, both the front and rear zones of the second inverter electric field can operate in optimal condition whether their plates and wires are sprayed or not. Therefore, the second inverter electric field can operate efficiently and stably throughout the day, thus laying the foundation for the wet electrostatic precipitator to operate efficiently and stably throughout the day and significantly reduce the maximum instantaneous value and daily average value of the dust concentration in its outlet airflow.

[0079] In summary, the operation method of a wet electrostatic precipitator with a front and rear partitioned inverter electric field, as described above, includes:

[0080] The first inverter electric field front zone and the first inverter electric field rear zone are each powered separately by the first inverter electric field front zone high-voltage power supply device 71 and the first inverter electric field rear zone high-voltage power supply device 72, respectively. Conversely, the second inverter electric field front zone and the second inverter electric field rear zone are each powered separately by the second inverter electric field front zone high-voltage power supply device 73 and the first inverter electric field rear zone high-voltage power supply device 74, respectively. Therefore, the operation of the first (or second) inverter electric field front zone and the first (or second) inverter electric field rear zone does not affect each other, allowing each of these two electric field zones to operate independently. The system operates at its optimal state and significantly increases the operating voltage of the rear region of the first (or second) inverter electric field, thereby significantly improving the dust removal efficiency of the front region of the first (or second) inverter electric field, the rear region of the first (or second) inverter electric field, and the dust removal efficiency of the wet electrostatic precipitator. Furthermore, the spray devices in the front and rear regions of the first inverter electric field can both adopt continuous or intermittent spraying modes, while the spray devices in the front and rear regions of the second inverter electric field can both adopt intermittent spraying modes.

[0081] When both the spray device in the front zone of the first inverter electric field and the spray device in the rear zone of the first inverter electric field adopt the continuous spraying working mode, they are used to continuously spray the plates and wires in the front zone and the rear zone of the first inverter electric field, respectively. This continuously humidifies the airflow in the first inverter electric field and also makes the surface of the anode plate and the cathode wire in the front and rear zones of the first inverter electric field uniformly and continuously distributed with downward flowing water film. The captured dust falls into the first ash hopper along with the water film.

[0082] When the spray devices in the front and rear zones of the first inverter electric field adopt continuous spraying and intermittent spraying modes respectively, the former is used to continuously spray the plates and wires in the front zone of the first inverter electric field, and the latter is used to periodically spray the plates and wires in the rear zone of the first inverter electric field under the premise of reduced voltage operation, so that both the front and rear zones of the first inverter electric field can operate continuously, efficiently and stably.

[0083] When both the first inverter electric field front zone spray device and the first inverter electric field rear zone spray device adopt the intermittent spraying working mode, and it is necessary to periodically and intermittently spray the plates and wires of the first inverter electric field front zone and / or the first inverter electric field rear zone, then the first inverter electric field front zone spray device and / or the first inverter electric field rear zone spray device are used individually or sequentially to periodically and intermittently spray the plates and wires; due to a water mist blocking plate 55 erected on the boundary line between the first inverter electric field front zone and the first inverter electric field rear zone, This system prevents a portion of the water mist sprayed by the spray device in the front (or rear) zone of the first inverter electric field from crossing the boundary line and entering the rear (or front) zone of the first inverter electric field. This strictly controls the coverage area of ​​the water mist sprayed by the spray device in the front (or rear) zone of the first inverter electric field within that zone, allowing the rear zone (or front) of the first inverter electric field to continue operating normally without needing to operate at reduced voltage like the front (or rear) zone. Therefore, although the dust removal efficiency of the front (or rear) zone of the first inverter electric field will decrease slightly, the dust removal efficiency of the rear (or front) zone will not decrease. Thus, the spraying will only slightly reduce the dust removal efficiency of the first inverter electric field, but will not cause a significant short-term increase in the dust concentration in the outlet airflow of the wet electrostatic precipitator.

[0084] When both the second inverter electric field front zone spray device and the second inverter electric field rear zone spray device operate in intermittent spraying mode, and it is necessary to periodically spray the second inverter electric field front zone and / or the second inverter electric field rear zone, then the second inverter electric field front zone spray device and / or the second inverter electric field rear zone spray device are used individually or sequentially for periodic intermittent spraying. Similarly, because a water mist barrier plate 55 erected on the boundary line between the second inverter electric field front zone and the second inverter electric field rear zone can prevent... A portion of the water mist sprayed by the spray device in the front (or rear) zone of the second inverter electric field crosses the boundary line and flows into the rear (or front) zone of the second inverter electric field. This strictly controls the coverage area of ​​the water mist sprayed by the spray device in the front (or rear) zone of the second inverter electric field within the front (or rear) zone, allowing the rear zone (or front zone) of the second inverter electric field (or front zone) to continue operating normally, i.e., it does not need to operate with reduced voltage like the front (or rear) zone. Therefore, although the dust removal efficiency of the front (or rear) zone of the second inverter electric field will decrease slightly at this time, the dust removal efficiency of the rear (or front) zone will not decrease. Thus, the above spraying will only slightly decrease the dust removal efficiency of the second inverter electric field, but will not cause a significant short-term increase in the dust concentration of the outlet airflow of the wet electrostatic precipitator.

[0085] In short, in a wet electrostatic precipitator with a front and rear partitioned inverter electric field as described above, the above-mentioned operating method can be used to remove dust from the dust-laden airflow, enabling it to operate efficiently and stably throughout the day. Moreover, periodic and intermittent spraying of any one of its electric field partitions or sequentially spraying the plates and wires of each electric field partition will not cause a significant short-term increase in the dust concentration of the outlet airflow of the wet electrostatic precipitator.

[0086] Furthermore, both the first (or second) front zone nozzle and the first (or second) rear zone nozzle can be replaced with solid cone 60° nozzles or solid cone 120° nozzles. However, several first (or second) front zone spray branch pipes and first (or second) rear zone spray branch pipes should be appropriately added or removed simultaneously. The distances between two adjacent first (or second) front zone spray branch pipes and between two adjacent first (or second) rear zone spray branch pipes should also be appropriately adjusted. For example, both distances could be set to approximately 450mm or 650mm. Additionally, several first (or second) front zone spray branch pipes should be appropriately added or removed simultaneously on each spray branch pipe. The nozzle and the first (or second) rear area nozzle, and also need to make appropriate adjustments to the distance between two adjacent first (or second) front area nozzles and the distance between two adjacent first (or second) rear area nozzles, for example, setting both distances to about 450mm or about 650mm, so that the spray area formed by all the first (or second) front area nozzles spraying together can fully and completely cover the entire front area of ​​the first (or second) inverter electric field, and the spray area formed by all the first (or second) rear area nozzles spraying together can fully and completely cover the entire rear area of ​​the first (or second) inverter electric field.

[0087] Finally, five more points should be added:

[0088] First, the air intake box, the outer shell, and the air outlet box all need to be protected against corrosion, or all of them should be made of stainless steel.

[0089] Secondly, if the dust concentration in the airflow to be purified is relatively low, the second inverter electric field can be eliminated based on the wet electrostatic precipitator, and the length of its shell 20 can be shortened accordingly, thereby creating a new wet electrostatic precipitator with appropriate dust removal efficiency and an inverter electric field with front and rear partitions.

[0090] Thirdly, in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "lateral," "longitudinal," "vertical," "horizontal," "left side," "right side," "front," "back," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0091] Fourth, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "set with," "connected," "interlocked," and "connected" should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0092] Fifth, the components used in this utility model are all general standard parts or components known to those skilled in the art, and their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods.

Claims

1. A wet electrostatic precipitator of the reverse flow type having a front and back section, comprising an inlet box, a housing and an outlet box, characterized in that: It also includes one or two inverter electric fields; the inverter electric field includes a front region and a rear region, and is equipped with a front region spray device and a rear region spray device respectively corresponding to the front region and the rear region; the front region includes multiple front region cathode wire groups and multiple front region transparent anode plate rows arranged alternately, while the rear region includes multiple rear region cathode wire groups and multiple rear region transparent anode plate rows arranged alternately, wherein each front region cathode wire group is not adjacent to any rear region cathode plate row. The cathode wire groups are electrically connected, and the upper rear end of each front zone transparent anode plate array and the upper front end of each rear zone transparent anode plate array are all fixedly connected to the bottom end of a water mist blocking plate with a height between 500mm and 1000mm, which is erected on the dividing line between the front zone and the rear zone of the inverter electric field and is fixedly connected to the left and right side plates of the housing, respectively. This is to prevent the water mist sprayed by the front zone spraying device and the rear zone spraying device of the inverter electric field from rushing into the rear zone and the front zone of the inverter electric field, respectively. The multiple front cathode wire groups and the multiple rear cathode wire groups are respectively electrically connected to the negative high voltage output terminal of the inverter electric field front high voltage power supply device and the negative high voltage output terminal of the inverter electric field rear high voltage power supply device, and the discharge performance of the front cathode wire in the front cathode wire group is stronger than that of the rear cathode wire in the rear cathode wire group.

2. A wet electrostatic precipitator of the reverse flow electrostatic field type having a front and back section as defined in claim 1, characterized in that: Both the high-voltage power supply device in the front region of the inverter electric field and the high-voltage power supply device in the rear region of the inverter electric field are frequency converters.

3. A wet electrostatic precipitator with a front and rear partitioned inverter electric field according to claim 1, characterized in that: The front cathode wire in the front cathode wire group and the rear cathode wire in the rear cathode wire group are respectively tubular barbed wire and straight fishbone needle wire, or straight fishbone needle wire and CS10A needle wire, or straight fishbone needle wire and serrated wire, or CS10A needle wire and CS10B needle wire, or serrated wire and V0 wire.

4. A wet electrostatic precipitator of the reverse flow electrostatic field type having a front and back section as defined in claim 1, characterized in that: The front-area transparent anode plate row includes a front-area electrode plate fixing frame and multiple front-area anode plates installed in a grid-like manner within it, while the rear-area transparent anode plate row includes a rear-area electrode plate fixing frame and multiple rear-area anode plates installed in a grid-like manner within it. Both the front-area anode plate and the rear-area anode plate include an electrode plate main part and an electrode plate left-side curved part and / or electrode plate right-side curved part integrated with it. Moreover, the cross-sectional dimensions of the front-area anode plate are the same as those of the rear-area anode plate.

5. A wet electrostatic precipitator of the reverse flow electrostatic field type provided with a front and back section as defined in claim 4, characterized in that: The cross-sections of the front anode plate and the rear anode plate are both trapezoidal grooves, or both are integral symbols ∫, or both are F-shaped; In the front-area transparent anode plate array, the distance between the main plates of any two adjacent front-area anode plates is between 41mm and 55mm; in the rear-area transparent anode plate array, the distance between the main plates of any two adjacent rear-area anode plates is between 31mm and 40mm, or is equal to the distance between the main plates of any two adjacent front-area anode plates in the front-area transparent anode plate array.

6. A wet electrostatic precipitator of the reverse flow electrostatic field type having a front and back section as defined in claim 5, characterized in that: The angle between the setting direction of the air inlet end to the air outlet end of the anode plate of the front zone and the direction of the dust-laden airflow at the outlet of the front zone air outlet channel of the inverter electric field is between 100° and 130°. The angle between the direction of the air inlet end to the air outlet end of the main part of the anode plate in the rear region and the direction of the dust-laden airflow at the inlet of the rear air inlet channel of the inverter electric field is also between 100° and 130°.

7. A wet electrostatic precipitator with a front and rear partitioned inverter electric field according to claim 1, characterized in that: The front zone transparent anode plate array, the rear zone transparent anode plate array, the water mist barrier plate, the front zone cathode wire, and the rear zone cathode wire are all made of 316L stainless steel or duplex stainless steel.

8. A wet electrostatic precipitator of the reverse flow electrostatic field type having a front and back section as defined in claim 1, characterized in that: The inverter electric field front zone spray device includes a front zone spray main pipe connected to the water inlet main pipe of the spray device and multiple front zone spray branch pipes connected thereto, as well as a front zone spray electric control valve installed on the front zone spray main pipe and located upstream of the multiple front zone spray branch pipes, wherein each front zone spray branch pipe is provided with multiple front zone nozzles located above each of the front zone transparent anode plate rows; The inverter electric field back zone spray device includes a back zone spray main pipe connected to the water inlet main pipe of the spray device and multiple back zone spray branch pipes connected thereto, as well as a back zone spray electric control valve installed on the back zone spray main pipe and located upstream of the multiple back zone spray branch pipes, wherein each back zone spray branch pipe is provided with multiple back zone nozzles located above each of the back zone transparent anode plate rows.

9. A wet electrostatic precipitator of the reverse flow electrostatic field type having a front and back section as defined in claim 1, characterized in that: The discharge capability of the front cathode line of the preceding inverter electric field is stronger than that of the front cathode line of the following inverter electric field, and the discharge capability of the rear cathode line of the preceding inverter electric field is stronger than that of the rear cathode line of the following inverter electric field.

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