A method for optimizing and transforming a double-chamber four-field electrostatic precipitator

Abstract

The present invention relates to the technical field of electrostatic precipitator, and in particular to a method for optimizing and transforming a double-chamber four-field electrostatic precipitator, comprising the following steps: S1, cleaning the inside of the double-chamber four-field electrostatic precipitator; S2, reinforcing and upgrading the corroded and worn pole lines of the second and third electric fields; S3, changing the ash conveying pipelines of the first and second electric fields to separate ash conveying, and upgrading the power supplies of the third and fourth electric fields to high-efficiency pulse power supplies; S4, inspecting the wear of accessories in a rapping system, replacing them, and installing monitoring equipment for monitoring whether the rapping shaft is deformed; S5, simulating an inlet flue using computational fluid dynamics (CFD), and transforming the inlet flue while ensuring uniform airflow; the present invention maximizes the dust removal effect of the equipment through overall transformation, avoids the secondary flying of dust, and is equipped with monitoring equipment to detect the deformation of the rapping shaft in real time to ensure the effectiveness of the eccentric rapping force.

Description

Technical Field

[0001] The invention relates to the technical field of electrostatic precipitators, and in particular to an optimization and transformation method for a double-chamber four-electric-field electrostatic precipitator. Background Art

[0002] The double-chamber four-field electrostatic precipitator is a highly efficient dust removal equipment, mainly used for the treatment of industrial waste gas. Its working principle is to use a high-voltage electric field to ionize the gas to generate a large number of electrons and ions. These charged particles combine with the dust particles in the airflow under the action of the electric field, making them charged and moving toward the electrode, thereby achieving gas-solid separation. The charged dust is deposited on the electrode with opposite polarity under the action of the electric field force. After being vibrated by the cleaning device, the deposited dust is removed and the purified gas is discharged;

[0003] As the equipment works longer, there will be many factors that affect the dust removal effect, so it needs to be overhauled. The maintenance content is to replace the parts according to the wear and tear. However, although the simple replacement of parts can improve the dust removal effect;

[0004] However, it not only increases the cost, but also fails to maximize the dust removal efficiency. Summary of the invention

[0005] In view of the problems existing in the above-mentioned existing optimization and transformation method of the double-chamber four-field electrostatic precipitator, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a method for optimizing and transforming a double-chamber four-electric-field electrostatic precipitator.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for optimizing and transforming a double-chamber four-electric-field electrostatic precipitator, comprising the following steps:

[0008] S1. Clean the inside of the double-chamber four-field electrostatic precipitator;

[0009] S2, reinforcement and upgrading of the pole lines due to corrosion and wear in the second and third electric fields, including: replacement of cathode lines, correction of cathode frames, correction and reinforcement of anode plates, and adjustment of pole distance;

[0010] S3, change the ash conveying pipelines of the first and second electric fields into separate ash conveying pipelines, and upgrade the power supplies of the third and fourth electric fields to high-efficiency pulse power supplies;

[0011] S4. Check and replace the accessories in the rapping system for wear and install monitoring equipment to monitor whether the rapping shaft is deformed;

[0012] S5. Use computational fluid dynamics (CFD) to simulate the inlet flue and modify the inlet flue while ensuring uniform airflow;

[0013] S6. Eliminate air leakage inside the electrostatic precipitator.

[0014] As a preferred solution of the optimization and transformation method of the double-chamber four-field electrostatic precipitator of the present invention, the cathode line replacement method is as follows:

[0015] Isolate the connecting bolts at the root of the corroded cathode wire;

[0016] Prepare the cathode wire, install the bolts at the bottom of the cathode wire on the cathode small frame, and after tightening the bolts, spot weld the nuts;

[0017] After completion, check that each row of pole lines should be in the same plane.

[0018] As a preferred solution of the optimization and transformation method of the double-chamber four-field electrostatic precipitator of the present invention, the cathode frame correction method is as follows:

[0019] Check the cathode frame for damage, deformation, or cracking;

[0020] Correct the misalignment of the cathode frame and reinforce it with angle steel welding after correction;

[0021] After the cathode frame is adjusted, all bolt and nut connections are spot welded.

[0022] As a preferred solution of the optimization and transformation method of the double-chamber four-field electrostatic precipitator of the present invention, the anode plate correction and fixing method is as follows:

[0023] Check whether the cathode plate is deformed and determine the deformation condition;

[0024] Make corresponding corrections according to the deformation position and deformation intensity;

[0025] A comb plate is welded at the bottom of the cathode plate after correction to avoid excessive swing and insufficient expansion.

[0026] As a preferred solution of the optimization and transformation method of the double-chamber four-field electrostatic precipitator described in the present invention, the anode plate model is T05A-01-B, the surface of the flat steel belt is provided with a burr tip, and the flatness tolerance of the belt plate after installation is 10 mm.

[0027] As a preferred solution of the optimization and transformation method of the double-chamber four-field electrostatic precipitator of the present invention, wherein: the pole distance adjustment includes the same pole distance and the different pole distance, wherein the same pole distance of the first and second electric fields is 395±10mm, and the different pole distance is 197.5±5mm;

[0028] The same pole distance of the third and fourth electric fields is 450±10mm, and the different pole distance is 225±5mm.

[0029] As a preferred scheme for the optimization and transformation method of the double-chamber four-field electrostatic precipitator described in the present invention, the transformation method of separate ash transportation is as follows: two coarse ash pipes are respectively set on the left and right sides of the first and second electric fields of the electrostatic precipitator, and switched to any one of the three ash bins through the switching valve on the top of the ash bin.

[0030] As a preferred scheme for the optimization and transformation method of the dual-chamber four-field electrostatic precipitator described in the present invention, the specification of the high-efficiency pulse power supply is 80kV / 2.2A, the high-voltage power supply input power supply adopts three-phase 380V / 50Hz, and the high-voltage power supply output rated current is: 2200mA.

[0031] As a preferred solution of the optimization and transformation method of the double-chamber four-field electrostatic precipitator of the present invention, the wear inspection includes the rapping hammer head, the wear-resistant sleeve, the wear-resistant sleeve bushing, the rapping shaft, and the bearing seat;

[0032] The monitoring equipment adopts multiple groups of distance sensors, which are arranged horizontally and equidistantly along the axial direction of the rapping shaft, and are used to monitor the distance between each section of the rapping shaft and the corresponding distance sensor.

[0033] As a preferred solution of the optimization and transformation method of the double-chamber four-field electrostatic precipitator described in the present invention, the transformation of the inlet flue includes adding a guide plate to the inlet flue and installing an airflow distribution plate in the expansion section.

[0034] Beneficial effects of the present invention: The present invention maximizes the dust removal effect of the equipment through overall transformation, avoids the secondary flying of dust, and is equipped with monitoring equipment to detect the deformation of the vibration shaft in real time to ensure the effectiveness of the eccentric vibration force. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0036] Figure 1 This is a step diagram of the optimization and transformation method of the double-chamber four-electric field electrostatic precipitator of the present invention. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0041] Example 1

[0042] See the instruction manual Figure 1 , a method for optimizing and transforming a double-chamber four-field electrostatic precipitator, comprising the following steps:

[0043] S1. Clean the inside of the double-chamber four-field electrostatic precipitator;

[0044] Specifically, open all manhole doors to check the dust accumulation inside the double-chamber four-field electrostatic precipitator. If there is dust accumulation in the ash hopper, the expansion joint must be removed for dry cleaning to ensure that the ash hopper is unobstructed;

[0045] Remove all expansion joints connecting the ash hopper and silo pump, and connect drainage water bags at the ash outlet;

[0046] Drain and isolate all silo pump inlets, first seal them with thick double-layer plastic sheeting, and then protect them with rubber or iron plates to prevent falling objects from penetrating the sealed plastic sheeting and causing water to enter the silo pumps;

[0047] Use plastic sheets to waterproof and isolate all electrical cabinets, pneumatic control cabinets and other equipment in the double-chamber four-field electrostatic precipitator room;

[0048] Two water reservoirs are built on the ground between the first and second electric fields and the third and fourth electric fields respectively using sandbags or poles. The inside of the water reservoirs are covered with multiple layers of plastic sheets to ensure that water does not seep out of the water reservoirs.

[0049] On the ground outside the double-chamber four-field electrostatic precipitator, use sandbags or poles to build simple stepped first, second and third-level gray water sedimentation tanks, and use mud pumps to discharge the mud in the reservoir into the first-level sedimentation tank;

[0050] The fire water is connected to the high-pressure washing truck and pressurized by the booster pump, and then the internal components of the double-chamber four-field electrostatic precipitator are repeatedly washed from top to bottom until they are clean;

[0051] The grey water is discharged to a designated location after sedimentation, completing the cleaning work.

[0052] S2, reinforcement and upgrading of the pole lines due to corrosion and wear in the second and third electric fields, including: replacement of cathode lines, correction of cathode frames, correction and reinforcement of anode plates, and adjustment of pole distance;

[0053] Specific method for replacing the cathode wire:

[0054] Isolate the connecting bolts at the root of the corroded cathode wire;

[0055] Prepare the cathode wire, install the bolts at the bottom of the cathode wire on the cathode small frame, and after tightening the bolts, spot weld the nuts;

[0056] After completion, check that each row of cathode wires should be in the same plane. This method only replaces the cathode wires that are severely worn or corroded by cutting and bolting, without the need for overall replacement, effectively reducing maintenance costs.

[0057] Further, cathode frame correction method:

[0058] Check the cathode frame for damage, deformation, or cracking;

[0059] Correct the misalignment of the cathode frame and reinforce it with 50×5 angle steel after correction;

[0060] After the cathode frame is adjusted, all bolt and nut connections are spot welded. The strength of the cathode frame after correction will become lower, and angle steel welding is used to effectively ensure the overall strength.

[0061] Further, the anode plate correction and fixing method:

[0062] Check whether the cathode plate is deformed and determine the deformation condition;

[0063] Correct the deformation according to the deformation position and strength. Correct the anode plate with less deformation. Use a gas cutting gun to bake the deformed position of the plate. Use a rubber hammer to knock. If the clamp on the anode plate is bent, it must be straightened. If the clamp is severely deformed, replace it with angle steel to increase its stress and prevent deformation.

[0064] Weld a comb plate at the bottom of the corrected cathode plate to avoid excessive swing and insufficient expansion;

[0065] Install a flat steel belt on the upper side of the cathode plate, and use angle irons on both sides of the cathode plate for support and reinforcement, and install bolts and spot weld them to prevent the belt from falling off; both ends of the lower hem of the anode plate must be reinforced with concave and convex sleeves and fixed with high-strength bolts.

[0066] Furthermore, the anode plate model is T05A-01-B, the flat steel belt surface has no burr tips, and the flatness tolerance of the belt plate after installation is 10mm.

[0067] Furthermore, the pole pitch adjustment includes the same pole pitch and different pole pitch, wherein the same pole pitch of the first and second electric fields is 395±10mm, and the different pole pitch is 197.5±5mm;

[0068] The same pole distance of the third and fourth electric fields is 450±10mm, and the different pole distance is 225±5mm.

[0069] Through correction, reinforcement, adjustment and partial replacement, the maintenance cost is reduced and resources are saved while ensuring the effect of use.

[0070] S3, change the ash conveying pipelines of the first and second electric fields into separate ash conveying pipelines, and upgrade the power supplies of the third and fourth electric fields to high-efficiency pulse power supplies;

[0071] Specifically, the transformation method of separate ash conveying is as follows: two coarse ash pipes are set on the left and right sides of the first and second electric fields of the electrostatic precipitator, and switched to any of the three ash silos through the switching valve on the top of the ash silo. The pipe diameter is DN200, and the pipeline output is 35t / h. The signal is connected to the No. 2 furnace dry ash removal control system to achieve comprehensive control of the ash conveying system;

[0072] The specification of high-efficiency pulse power supply is 80kV / 2.2A. The input power of high-voltage power supply adopts three-phase 380V / 50Hz without neutral line requirement. All electrical equipment and control systems should be able to work normally when changing within the following range: AC power supply (+10%~-10%) Ue, frequency 50±2%Hz; when the voltage is -22.5% Ue, the time does not exceed one minute, it should not cause permanent damage to the equipment. The rated current of high-voltage power supply output is 2200mA, the voltage adjustment range is 0~100%, the rated output voltage is 80kV, and the output current adjustment range is 0~100%. The output voltage, output current and input current of the high-voltage power supply can be set within the range of 0~100% according to the needs, and it can respond quickly and track the target value;

[0073] Power switching frequency: ≥15kHz;

[0074] Switching / resonance mode: soft switching / secondary side resonance (primary side resonance is not allowed): using efficient pure sinusoidal inverter mode, using special power supply design to achieve secondary side resonance and IGBT soft switching, improving the power supply conversion efficiency, and reducing the failure rate of high voltage power supply;

[0075] Output regulation mode: DC bus voltage regulation (frequency modulation is not allowed);

[0076] The power conversion efficiency of high voltage power supply is ≥95%;

[0077] The high-voltage power supply adopts the "spark critical adaptive" control mode to automatically optimize and maximize the "effective field strength" and "spatial free ion concentration", thereby improving the reliability and stability of the equipment, reducing arc corrosion in the electrostatic precipitator, and increasing the service life of the electrostatic precipitator itself.

[0078] The high-voltage signal uses isolated sampling to improve the stability of the control system and can truly reflect the output voltage and output current;

[0079] High-speed control signals (such as conduction angle control, IGBT control) are transmitted using optical fiber to improve the anti-interference performance of the high-voltage power supply;

[0080] Spark flashover judgment time is less than 4us, and it can respond quickly when flashover occurs;

[0081] The thyristor uses an RC protection circuit to improve the reliability of the thyristor's operation;

[0082] The thyristor control adopts high-precision microcomputer control to achieve three-phase load balance.

[0083] S4. Check and replace the accessories in the rapping system for wear and install monitoring equipment to monitor whether the rapping shaft is deformed;

[0084] Specifically, the wear inspection includes the rapping hammer head, wear-resistant sleeve, wear-resistant sleeve, rapping shaft, bearing seat, and the rapping shaft and the electrostatic precipitator housing are sealed to prevent cold air from leaking in during operation. The specification model of the anode rapping hammer head is Y05E-CX.55.02;

[0085] The anode vibration acceleration is not less than 150g, and the cathode vibration acceleration is not less than 50g;

[0086] The monitoring equipment uses multiple groups of distance sensors, which are equidistantly arranged horizontally along the axial direction of the rapping shaft to monitor the distance between each section of the rapping shaft and the corresponding distance sensor. The rapping shaft is monitored in real time to ensure the linearity of the rapping shaft, avoid problems such as insufficient centrifugal rapping force or interference due to deformation, and ensure the rapping cleaning effect by correcting the impact eccentricity.

[0087] Example 2

[0088] This embodiment is different from the first embodiment in that: the optimization and transformation method of a dual-chamber four-electric field electrostatic precipitator disclosed in this embodiment also includes:

[0089] The inlet flue was simulated by computational fluid dynamics (CFD) and modified while ensuring uniform airflow;

[0090] Specifically, the inlet flue modification includes installing guide plates in the inlet flue and air flow distribution plates in the expansion section to make the airflow uniform, avoid unbalanced air flow in the dust collector, and ensure the air flow distribution coefficient in the dust collector.

[0091] The implementation conditions of the flow-guiding airflow distribution form are based on laboratory simulation tests. Under the premise of similar geometry and dynamics of the dust collector, a 1:10 simulation test is carried out to determine the uniformity of the airflow distribution so that the uniformity of the airflow distribution in the electric field is less than 0.2.

[0092] The rest of the structure is the same as that of Example 1.

[0093] Example 3

[0094] This embodiment is different from the above embodiments in that: the optimization and transformation method of a dual-chamber four-electric field electrostatic precipitator disclosed in this embodiment also includes eliminating air leakage inside the electrostatic precipitator.

[0095] Specifically, check the wear of the electrostatic precipitator bell mouth (inlet and outlet) and the electrostatic precipitator body. The wall thickness of the precipitator shell should not be less than 6mm. Weld and repair the serious thinning and leakage points.

[0096] There shall be no pores or slag inclusions in the welds at the sealing welding position;

[0097] The support pipe seat and the bottom plate of the electromagnetic vibrator must be fully welded;

[0098] Check and clean high-voltage porcelain parts to ensure the surface of insulating porcelain parts is clean to prevent creepage breakdown caused by dust accumulation.

[0099] 6.16.20 After optimization and transformation, the dust removal efficiency of the electrostatic precipitator shall not be less than 99.83%, the outlet dust concentration shall be less than 20mg / Nm3, the resistance of the electrostatic precipitator body shall be ≤245Pa, the air leakage rate of the body shall be ≤2.5%, and the heating temperature of the beam and porcelain shaft shall be between 80 and 100℃.

[0100] The rest of the structure is the same as that of Example 2.

[0101] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0102] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0103] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0104] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for optimizing and transforming a double-chamber four-field electrostatic precipitator, characterized in that: The following steps are involved: S1. Clean the inside of the double-chamber four-field electrostatic precipitator; S2, reinforcement and upgrading of the pole lines due to corrosion and wear in the second and third electric fields, including: replacement of cathode lines, correction of cathode frames, correction and reinforcement of anode plates, and adjustment of pole distance; S3, change the ash conveying pipelines of the first and second electric fields into separate ash conveying pipelines, and upgrade the power supplies of the third and fourth electric fields to high-efficiency pulse power supplies; S4. Check and replace the accessories in the rapping system for wear and install monitoring equipment to monitor whether the rapping shaft is deformed; S5. Use computational fluid dynamics (CFD) to simulate the inlet flue and modify the inlet flue while ensuring uniform airflow; S6. Eliminate air leakage inside the electrostatic precipitator.

2. The optimization and transformation method of the double-chamber four-electric-field electrostatic precipitator according to claim 1 is characterized in that: Cathode line replacement method: Isolate the connecting bolts at the root of the corroded cathode wire; Prepare the cathode wire, install the bolts at the bottom of the cathode wire on the cathode small frame, and after tightening the bolts, spot weld the nuts; After completion, check that each row of pole lines should be in the same plane.

3. The optimization and transformation method of the double-chamber four-electric-field electrostatic precipitator according to claim 2 is characterized in that: Cathode frame correction method: Check the cathode frame for damage, deformation, or cracking; Correct the misalignment of the cathode frame and reinforce it with angle steel welding after correction; After the cathode frame is adjusted, all bolt and nut connections are spot welded.

4. The optimization and transformation method of the double-chamber four-electric-field electrostatic precipitator according to claim 3 is characterized in that: Anode plate correction and fixing method: Check whether the cathode plate is deformed and determine the deformation condition; Make corresponding corrections according to the deformation position and deformation intensity; A comb plate is welded at the bottom of the cathode plate after correction to avoid excessive swing and insufficient expansion.

5. The optimization and transformation method of the double-chamber four-electric-field electrostatic precipitator according to claim 4 is characterized in that: The anode plate model is T05A-01-B. The surface of the flat steel belt is provided with a burr tip. After installation, the flatness tolerance of the belt plate is 10mm.

6. The optimization and transformation method of the double-chamber four-electric-field electrostatic precipitator according to claim 5, characterized in that: The pole distance adjustment includes the same pole distance and different pole distance (the same pole refers to the corona pole and the corona pole or the dust collecting pole and the dust collecting pole; the different pole refers to the corona pole and the dust collecting pole). Among them, the same pole distance of the first and second electric fields is 395±10mm, and the different pole distance is 197.5±5mm. The same pole distance of the third and fourth electric fields is 450±10mm, and the different pole distance is 225±5mm.

7. The optimization and transformation method of the double-chamber four-electric-field electrostatic precipitator according to claim 6, characterized in that: The modification method of separate ash transportation: two coarse ash pipes are set on the left and right sides of the first and second electric fields of the electrostatic precipitator, and switched to any of the three ash silos through the switching valve on the top of the ash silo.

8. The optimization and transformation method of the double-chamber four-electric-field electrostatic precipitator according to claim 7, characterized in that: The specification of the high-efficiency pulse power supply is 80kV / 2.2A, the high-voltage power supply input power adopts three-phase 380V / 50Hz, and the high-voltage power supply output rated current is: 2200mA.

9. The optimization and transformation method of the double-chamber four-electric-field electrostatic precipitator according to claim 8, characterized in that: Wear inspection includes rapping hammer head, wear-resistant sleeve, wear-resistant bushing, rapping shaft, and bearing seat; The monitoring equipment adopts multiple groups of distance sensors, which are arranged horizontally and equidistantly along the axial direction of the rapping shaft, and are used to monitor the distance between each section of the rapping shaft and the corresponding distance sensor.

10. The optimization and transformation method of the double-chamber four-electric-field electrostatic precipitator according to claim 9, characterized in that: The modification of the inlet flue includes installing guide plates on the inlet flue and air flow distribution plates in the expansion section.

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