Method for eliminating flashover and creepage faults of electric precipitation electric field of sintering machine head matched with nodular cast iron pipe production

Abstract

The invention discloses a method for eliminating flashover and creepage faults of an electric precipitation electric field of a sintering machine head matched with nodular cast iron pipe production, relates to the technical field of maintenance of equipment matched with nodular cast iron pipe production, and aims to eliminate flashover and creepage faults of a second electric field and a third electric field. The method comprises the following steps: eliminating the influence of an electric precipitation body structure, including heteropolar distance reduction or short circuit caused by deformation or damage of a cathode and an anode; the problems that an insulator is damaged or dust is accumulated, an insulator heater does not work and a damping resistor breaks down are solved; a cathode heat preservation box heater is improved, a whole heating device is replaced with a corrosion-resistant material, and meanwhile fins made of the corrosion-resistant material are additionally arranged on the periphery of a heating part; the electromagnetic vibrator installed outdoors is completely sleeved with the top-sealed sleeve, and water leakage and air leakage at the upper end of the cathode heat preservation box from the movable connection position of the electromagnetic vibrator and the heat preservation material are completely eradicated; according to the invention, the heater and the vibrator of the cathode heat preservation box are transformed, so that the faults of flashover and creepage of an electric field are solved, and the dust removal efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of maintenance of supporting equipment for ductile iron pipe production, in particular to a method for eliminating electric field flashover and creepage faults of an electrostatic precipitator of a sintering machine head supporting the production of ductile iron pipes. Background Art

[0002] The ductile iron pipe production workshop is equipped with a sintering machine. For dust removal needs, the equipment is also equipped with a sintering machine head electrostatic precipitator. In the past, when the equipment was new, its dust removal effect was good and could meet production needs. As time went by, the second and third electric fields of the company's sintering machine head electrostatic precipitator often experienced flashover and creepage, causing the electric field voltage and current to decrease and become unstable, and the dust removal efficiency to decrease, which has affected the smooth operation of the downstream flue gas desulfurization and denitrification process. In this regard, maintenance personnel have conducted problem investigation and found and replaced the damaged insulators, but the problem has not been solved. The flashover and creepage phenomena have seriously endangered normal production. Therefore, a method for eliminating electric field flashover and creepage faults of the sintering machine head electrostatic precipitator for ductile iron pipe production is urgently needed to solve this problem. Summary of the invention

[0003] The purpose of the present invention is to provide a method for eliminating electric field flashover and creepage faults of electrostatic precipitators in sintering machine heads for ductile iron pipe production, so as to eliminate the faults. In order to achieve this purpose, the possible causes of the faults are analyzed preferentially as follows:

[0004] 1. Factors related to the electrostatic precipitator

[0005] (1) The distance between the pole plates and pole wires is reduced due to deformation, and discharge occurs: During operation, when the ash hopper is full of ash and cannot be discharged in time, the expansion of the anode plate may be blocked, the pole plate may be partially bent, and the polar distance may be reduced; when the anode plate rapping rod is blocked, during the rapping process, the lower clamping plate of the anode plate is bent, resulting in the bending of the anode plate row as a whole, and the polar distance becomes smaller; the connection slots of the anode plate row are damaged, and the adjacent anode plates are not integrated with each other. Since the anode plates are relatively long and thin, they are not rigid enough and are prone to bending, and the polar distance becomes smaller; the expansion distance of the cathode wire is blocked, the pole wire is deformed, and the polar distance becomes smaller; the rigidity of the cathode wire body is insufficient, resulting in local bending and deformation, and the polar distance becomes smaller; the cathode thorn wire tip is bent a lot, and the discharge distance becomes smaller; the tightening force of the cathode spiral wire decreases, and loose swing occurs, and the local gap becomes smaller;

[0006] (2) The cathode small frame is partially deformed or displaced, causing discharge: During operation, the cathode small frame is subjected to the rapping force of the cathode rapping. The cathode rapping is operated for a long time, causing local deformation of the small frame, and the distance between the anode plate and the cathode frame becomes smaller; the cathode small frame connecting rod is partially welded or broken, causing the distance between the frame and the plate to become smaller; individual cathode hanging rods sink, causing the cathode frame to shift in a certain direction as a whole, and the overall polar distance becomes smaller;

[0007] (3) The anode plate limit is damaged or too low, and the plate is discharged from the slot. During operation, the anode plate rapping rod is subjected to the rapping force of the rapping system for a long time, and reciprocates as a piston. The limit plates on both sides are worn out or welded and fall off due to long-term contact. The lower part of the plate row swings to both sides, and sometimes it contacts the cathode system and causes a direct short circuit. When the ash hopper is full of ash, the accumulated ash reaches the plate row, and the expansion of the plate row is blocked. As the ash accumulates more and more, the plate row will be pushed out of the slot by the accumulated ash, resulting in spark discharge or direct short circuit.

[0008] 2. Factors related to power supply and control

[0009] (1) Insulators are damaged or heavily dusted, causing creepage discharge: The insulating porcelain sleeve and porcelain shaft are used to support and insulate the discharge system. During operation, a layer of dust and dirt often accumulates on the surface of the porcelain sleeve, reducing the insulation level. Under the action of high voltage, "creepage" occurs, and breakdown discharge occurs. Long-term discharge also causes carbonization of the dustproof plate surface, so that the electric field voltage flashes frequently and cannot operate at high voltage; the insulating porcelain sleeve and insulating porcelain shaft will crack or break after long-term operation because they are pressure-bearing parts, which reduces the insulation performance to the minimum and causes serious electric field discharge;

[0010] (2) The insulator heater does not heat and air leakage causes condensation, leading to discharge: This situation usually occurs after the electric field is overhauled. The weather temperature is low, the insulator heater is damaged and does not heat, water vapor condenses on the surface of the insulating parts, the insulation is seriously reduced, and discharge occurs; when the manhole door, electric heater and temperature measuring device are installed, there is serious air leakage, which can cause rainwater to directly invade the insulator chamber, and the surface of the high-voltage insulator and the cathode rapper porcelain shaft is contaminated by water vapor and creepage occurs; when the flue gas temperature is low, the temperature of the insulator chamber is mainly maintained by electric heating and hot air heating, and after the flue gas temperature rises, it is mainly maintained by the heat carried by the flue gas. The size of the insulator chamber has a great influence on the increase and maintenance of temperature;

[0011] (3) Damping resistor failure: When the damping resistor wire is partially broken or cracked, violent discharge will occur in the electric field; when the damping resistor fails or the tension decreases and becomes loose, discharge will occur in the operating electric field.

[0012] However, after eliminating all the above possible checks, the second and third electric field flashover and creepage phenomena of the sintering machine head electrostatic precipitator still frequently occur.

[0013] To achieve the above purpose, the present invention provides the following technical solution: a method for eliminating electric field flashover and creepage faults of electrostatic precipitator in sintering machine head for production of ductile iron pipes, including the following specific contents:

[0014] S1 eliminates the influence of the structure of the electrostatic precipitator, including the reduction of the inter-polar distance or short circuit caused by the deformation or damage of the cathode and anode;

[0015] S2 eliminates problems such as insulator damage or dust accumulation, insulator heater failure, and damping resistor failure;

[0016] S3 improves the cathode insulation box heater by replacing the entire heating device with corrosion-resistant materials, and adding fins made of corrosion-resistant materials around the heating part;

[0017] S4 will cover the electromagnetic vibrator installed outdoors with a capped casing to prevent water and air leakage from the active connection between the electromagnetic vibrator and the insulation material at the upper end of the cathode insulation box.

[0018] Preferably, in the above step S3, the heater is an annular tubular sleeve arranged on the outer periphery of the cathode insulation box, and the corrosion-resistant material is stainless steel.

[0019] Preferably, in the above step S3, a plurality of fins are fixedly provided at equal intervals along the annular tube, each fin is in a circular ring shape, and the inner diameter of the fin matches the diameter of the wall of the annular tube.

[0020] Preferably, in the above step S4, the outer periphery of the sleeve is made of UPVC material, the top end is made of a transparent acrylic plate, or the entire sleeve is made of a transparent acrylic plate.

[0021] Preferably, in the above step S1, the inspection to eliminate the influence of the electrostatic precipitator body structure includes: whether the anode plate has expansion obstruction and / or local bending, whether the connection slots of the anode plate row are damaged, whether the cathode wire has expansion and / or local bending deformation, whether the cathode thorn wire tip is bent, whether the cathode spiral wire tension meets the requirements, and whether there is loose swing; whether the cathode small frame has local deformation or displacement; whether the anode plate row is out of the groove.

[0022] Preferably, in the above step S2, the insulator damage includes cracks or fractures in the insulating porcelain sleeve and / or the insulating porcelain shaft, and the damping resistor failure includes local fracture or cracks, and the damping resistor fails or loosens due to reduced tightening force.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The method for eliminating electric field flashover and creepage faults of the electrostatic precipitator in the sintering machine head for the production of ductile iron pipes starts from the most basic problem. First, through inspection and analysis, the problems of the electrostatic precipitator body structure, insulators, insulator heaters, and damping resistors that may cause faults are eliminated. Then, through the transformation of the cathode insulation box heater and the vibrator, the faults of electric field flashover and creepage are solved, the hidden dangers are eliminated, and the dust removal efficiency is improved.

[0025] 2. The method for eliminating electric field flashover and creepage faults of the electrostatic precipitator in the sintering machine head for the production of ductile iron pipes uses a stainless steel fin heater to replace the original carbon steel heater, which is conducive to increasing and stabilizing the temperature of the cathode insulation box, preventing the generation of flue gas condensation water in the cathode insulation box, and ensuring the insulation performance of the internal high-voltage components. Compared with carbon steel heaters, it is easy to maintain in the later stage, has a long equipment life, and extends the replacement cycle of the heater.

[0026] 3. The method for eliminating electric field flashover and creepage faults of the electrostatic precipitator in the production of ductile iron pipes for sintering machine heads adopts a casing instead of the original rainproof plastic bag. The material of the rainproof plastic bag is not resistant to aging and has a short service life. The casing fundamentally eliminates the problem of water leakage and air leakage, and the working status of the electromagnetic vibrator can be observed from the acrylic plate. The entire protective device is easy to use and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the improved cathode insulation box heater of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the electromagnetic rapper casing of the present invention. DETAILED DESCRIPTION

[0029] The present invention is aimed at the electric field flashover and creepage faults of the electrostatic precipitator in the sintering machine head supporting the production of ductile iron pipes:

[0030] First, eliminate the influence of the main structure of the electrostatic precipitator, including the reduction of the polar distance or short circuit caused by the deformation or damage of the cathode and anode; specifically, including: whether the anode plate is blocked from expansion and / or partially bent, whether the connecting slots of the anode plate row are damaged, whether the cathode wire is expanded and / or locally bent, whether the cathode thorn wire tip is bent, whether the cathode spiral wire tension meets the requirements, and whether there is loose swing; whether the cathode small frame is locally deformed or displaced; whether the anode plate row is out of the slot.

[0031] Secondly, eliminate the problems of insulator damage or dust accumulation, insulator heater failure and damping resistor failure; specifically, insulator damage includes cracks or breakage of the insulating porcelain sleeve and / or insulating porcelain shaft, damping resistor failure includes local breakage or cracks, damping resistor failure or loosening due to reduced tightening force.

[0032] After eliminating the above faults (specific troubleshooting methods include replacing deformed or damaged parts and tightening loose parts), if the faults of electric field flashover and creepage of the electrostatic precipitator are not solved, you can continue with the following operations:

[0033] Improve the cathode insulation box heater by replacing the heating element with corrosion-resistant material and adding fins made of corrosion-resistant material around the heating part; Figure 1In a preferred embodiment, the heater is an annular tubular sleeve arranged at the outer periphery of the cathode insulation box, and the corrosion-resistant material is stainless steel; further optionally, a plurality of fins are fixed at equal intervals along the annular tube, each fin is annular, and the inner diameter of the fin matches the diameter of the annular tube wall. For reference, the heater adopts a 220V 3KW high-power model.

[0034] The reason for improving the cathode insulation box heater in the above manner is that, after analysis, the present invention has found that because the temperature inside the cathode insulation box has not reached the lower limit of the operating temperature of 70 degrees, and the sintered flue gas not only contains water vapor, but also has a temperature of only 110 to 130 degrees, part of the flue gas passes through the insulating layer into the cathode insulation box and condenses, forming condensed water on the insulating porcelain sleeve and the insulating shaft, causing discharge, flashover and creepage faults. Therefore, simply replacing the damaged insulator cannot solve the root cause of the problem. The original heater is made of carbon steel. In an environment with high humidity, the heater rusts and the heating capacity decreases rapidly, which in turn causes the temperature of the cathode insulation box to drop, which in turn leads to the generation of more condensed water.

[0035] In addition, see Figure 2 The structure of the existing electromagnetic rapper is as follows: the electromagnetic coil fixed in the protective cover is wound with enameled wire on a coil frame formed by bonding an insulating tube and an insulating plate. The electromagnetic coil, that is, the center of the insulating tube, is equipped with a rapping spring and a rapping rod. The lower end of the rapping rod is placed with a rapping gasket and a rapping anvil. The bolt passes through the flange of the protective cover and the sealing rubber ring and is connected to the rapping anvil flange to combine the electromagnetic rapping device into one. The lower end of the rapping anvil is connected to the rapping force transmission rod through the filling glue, passes through the insulation layer of the dust collector top plate (or wall panel) to enter the dust collector, and a retractable rubber tube is installed at the entrance. When the electromagnetic coil is energized, an electromagnetic field is generated, and the electromagnetic force quickly sucks the rapping rod into the center of the coil and compresses the rapping spring. When the power is off, the electromagnetic field disappears, and the rapping spring is released under the action of the elastic force, quickly hitting the rapping rod onto the rapping gasket and the rapping anvil, and the rapping force is transmitted to the dust collector electrode through the rapping force transmission rod, thereby achieving the effect of rapping and cleaning. In the past, a rainproof plastic bag was wrapped around the electromagnetic vibrator, but the ultraviolet rays of the sun and the wind and rain caused the bag to age and break quickly, causing the rainproof plastic bag to powder and break quickly outdoors.

[0036] In order to protect the cathode insulation box under the vibrator and reduce air and water leakage, the electromagnetic vibrator installed outdoors can be completely covered with a capped casing to prevent air and water leakage from the movable connection between the electromagnetic vibrator and the insulation material at the upper end of the cathode insulation box. Further preferably, the outer periphery of the casing is made of UPVC material, and the top is made of a transparent acrylic plate, or the entire casing is made of a transparent acrylic plate, so as to facilitate observation of the working status of the vibrator.

[0037] After our company adopted the above method, the temperature of the cathode insulation box of the three electric fields of the electrostatic precipitator at the sintering machine head increased significantly, the equipment operated stably, the original flashover and creepage faults were eliminated, and normal production was guaranteed.

[0038] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

[0039] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A method for eliminating electric field flashover and creepage faults of electrostatic precipitators in sintering machine heads for ductile iron pipe production, characterized in that: The specific contents include: S1 Eliminate the influence of the structure of the electrostatic precipitator, including the reduction of the inter-polar distance or short circuit caused by the deformation or damage of the cathode and anode; S2 eliminates problems such as insulator damage or dust accumulation, insulator heater failure, and damping resistor failure; S3 improves the cathode insulation box heater by replacing the entire heating device with corrosion-resistant materials, and adding fins made of corrosion-resistant materials around the heating part; S4 will cover the electromagnetic vibrator installed outdoors with a capped casing to prevent water and air leakage from the active connection between the electromagnetic vibrator and the insulation material at the upper end of the cathode insulation box.

2. The method for eliminating electric field flashover and creepage faults of sintering machine head electrostatic precipitator in the production of ductile iron pipes according to claim 1, characterized in that: In the step S3, the heater is an annular tubular sleeve arranged on the outer periphery of the cathode insulation box, and the corrosion-resistant material is stainless steel.

3. The method for eliminating electric field flashover and creepage faults of sintering machine head electrostatic precipitator for ductile iron pipe production according to claim 2 is characterized in that: In the step S3, a plurality of fins are fixedly arranged at equal intervals along the annular tube, each fin is in a circular ring shape, and the inner diameter of the fin matches the diameter of the wall of the annular tube.

4. The method for eliminating electric field flashover and creepage faults of sintering machine head electrostatic precipitator for ductile iron pipe production according to claim 1 is characterized in that: In step S4, the outer periphery of the sleeve is made of UPVC material, and the top end is made of a transparent acrylic plate, or the entire sleeve is made of a transparent acrylic plate.

5. The method for eliminating electric field flashover and creepage faults of sintering machine head electrostatic precipitator in ductile iron pipe production according to claim 1 is characterized in that: In step S1, the inspection to eliminate the influence of the electrostatic precipitator body structure includes: whether the anode plate is blocked from expansion and / or partially bent, whether the connection slots of the anode plate row are damaged, whether the cathode wire is expanded and / or partially bent and deformed, whether the thorn tip of the cathode thorn wire is bent, whether the tightening force of the cathode spiral wire meets the requirements, and whether there is loose swing; whether the cathode small frame is locally deformed or displaced; whether the anode plate row is out of the slot.

6. The method for eliminating electric field flashover and creepage faults of sintering machine head electrostatic precipitator for ductile iron pipe production according to claim 1 is characterized in that: In step S2, the insulator damage includes cracks or fractures of the insulating porcelain sleeve and / or the insulating porcelain shaft, and the damping resistor failure includes local fracture or cracks, and the damping resistor fails or loosens due to reduced tightening force.

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