Intelligent self-cleaning insulation system to prevent pollution flashover

Abstract

The present invention relates to an intelligent self-cleaning insulation system for preventing pollution flashover, comprising an insulator body, a surface self-cleaning mechanism, a leakage detection mechanism and an intelligent power supply mechanism, wherein the surface self-cleaning mechanism is covered on the inner wall of the insulator body, and a leakage detection mechanism is provided at the bottom end of the insulator body, wherein the leakage detection mechanism comprises a leakage micro-current collection ring sleeve and a micro-current sensor, wherein the leakage micro-current collection ring sleeve is connected to the micro-current sensor, and the surface self-cleaning mechanism and the leakage detection mechanism are respectively connected to the intelligent power supply mechanism. The present invention enables the insulation system to operate stably in combustion flue gas under complex working conditions through real-time online monitoring of leakage and intelligent adjustment of the working state of the surface self-cleaning mechanism, which is conducive to promoting the development and popularization of electrostatic dust removal in non-electrical industries.

Description

Technical Field

[0001] The invention belongs to the technical field of electrostatic dust removal, and in particular relates to an intelligent self-cleaning insulation system for preventing pollution flashover. Background Art

[0002] Air pollution seriously harms human health, damages the ecological environment, and hinders the sustainable development of cities and regions. my country's primary energy is mainly coal. In 2015, my country's total primary energy consumption reached 4.3 billion tons of standard coal, accounting for 23% of the world's total energy consumption, of which coal consumption accounted for 55.7% of the world's total coal consumption, ranking first in the world. The large amount of SO2, NOx, smoke, heavy metals and other pollutants produced during the combustion of coal are one of the important causes of my country's complex atmospheric pollution. In addition to the power industry, key industries such as cement, steel, glass, and petrochemicals are also major coal consumers. Among them, particulate matter is the core pollutant of atmospheric complex pollution, and its efficient and coordinated removal is the key to improving air quality.

[0003] Electrostatic precipitator technology is the mainstream technology for controlling particulate matter in coal-fired flue gas, with outstanding advantages such as high dust removal efficiency (>99.9%), low resistance (<300Pa), low energy consumption, large flue gas treatment capacity, simple maintenance, low long-term operating costs and no secondary pollution. Although the total dust removal efficiency of the electrostatic precipitator can reach more than 99.9%, the creepage phenomenon caused by the flashover of the electrostatic precipitator insulator is common, which causes insulation failure, equipment creepage, short-circuit shutdown and damage, resulting in great economic losses, and poses a challenge to the reliable compliance of particulate matter.

[0004] In recent years, a lot of research has been conducted at home and abroad on improving the insulation performance of insulators. At present, in thermal power, cement and other industries, electrostatic precipitators are equipped with insulation boxes and use electric heaters to heat their insulators, or use dry spiral wind to blow the insulators to ensure that the insulators are dry and condense-free, so as to achieve the purpose of preventing insulators from flashover. However, for combustion flue gas under complex working conditions, especially under special working conditions such as high temperature, high humidity, and high resistivity, the above methods do not significantly improve the insulation performance of insulators. At the same time, the insulators currently used cannot realize real-time monitoring functions for creepage phenomena and perform intelligent regulation, which poses a safety hazard. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides an intelligent self-cleaning insulation system for industrial combustion flue gas particulate removal system with reasonable structure, strong integrity, automatic dust cleaning and anti-pollution capability, good internal and external insulation performance, real-time online leakage monitoring and intelligent adjustment of working status, high safety performance and high stability.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A pollution flashover-proof intelligent self-cleaning insulation system, the intelligent self-cleaning insulation system comprising an insulator body, a surface self-cleaning mechanism, a leakage detection mechanism and an intelligent power supply mechanism, the surface self-cleaning mechanism covers the inner surface of the insulator body, a leakage detection mechanism is provided at the bottom end of the insulator body, the leakage detection mechanism comprises a leakage microcurrent collection ring and a microcurrent sensor, the leakage microcurrent collection ring is connected to the microcurrent sensor, and the surface self-cleaning mechanism and the leakage detection mechanism are respectively connected to the intelligent power supply mechanism.

[0008] Preferably, the insulator body is a straight porcelain sleeve or a tapered porcelain sleeve.

[0009] Preferably, the straight insulator sleeve has an outer diameter of 300-700 mm, a wall thickness of 25-35 mm, and a height of 350-700 mm; the conical insulator sleeve has a wall thickness of 25-40 mm, a height of 400-800 mm, a top circle outer diameter of 100-450 mm, and a bottom circle outer diameter of 350-700 mm.

[0010] Preferably, the surface self-cleaning mechanism comprises a discharge electrode and an insulating layer, the discharge electrode is etched in parallel on the surface of the insulator body, and the insulating layer is formed by spraying a dielectric film material on the discharge electrode and the surface of the insulator body.

[0011] Preferably, the discharge electrodes are arranged in a ring shape, and the spacing between the discharge electrodes is 0.1-0.7 mm.

[0012] The annular arrangement of the discharge electrodes forms a standing wave AC electric field between the discharge electrodes. This arrangement ensures that slight dust accumulation at the discharge electrode gap will not form a continuous path on the surface of the insulator body, achieving better insulation performance and effect. The spacing of the discharge electrodes is set to ensure that the particles can form a continuous movement in the standing wave AC electric field formed between the discharge electrodes, achieving better cleaning performance and effect.

[0013] Preferably, the leakage micro-current collecting ring is embedded in the insulator body, and the micro-current sensor is embedded in the insulator body. This arrangement can ensure the versatility of the insulation system and have stronger integrity.

[0014] Preferably, the width of the leakage micro-current collection ring is 0.5-1 mm. This width can ensure that the leakage micro-current is accurately captured, while not affecting the insulation performance of the insulator body. The material of the leakage micro-current collection ring is a metal with good conductivity.

[0015] Preferably, the intelligent power supply mechanism includes a leakage monitoring module for collecting micro-current signals, an intelligent calculation module for processing the output voltage, and a three-phase AC power supply.

[0016] The intelligent operation module is a device that converts the micro-current signal collected by the leakage monitoring module into a power control signal through a genetic algorithm, a particle swarm algorithm, an ant colony algorithm, etc., to achieve precise control of the output voltage of the three-phase AC power supply.

[0017] Preferably, the output voltage of the three-phase AC power supply is nine levels: 200V, 400V, 600V, 800V, 1000V, 1200V, 1400V, 1600V and 1800V, among which 200V, 400V and 600V are low-range - particle shielding mode, 800V, 1000V and 1200V are mid-range - particle removal mode, and 1400V, 1600V and 1800V are high-range - high-efficiency cleaning mode. When the output voltage of the three-phase AC power supply is in low-speed mode, the self-cleaning insulation system has the function of shielding particle adhesion, so that most particles do not fall onto the surface of the insulator body; when there are many particles accumulated on the inner wall of the insulator body, the leakage monitoring module captures the micro-current signal, and the intelligent operation module automatically adjusts the output voltage of the three-phase AC power supply to the mid-speed mode, and the self-cleaning insulation system enters the particle removal mode; if the dust particles on the inner wall of the insulator body are still seriously accumulated and some particles cannot be removed, and the leakage monitoring module still captures the micro-current signal, the intelligent operation module automatically adjusts the output voltage of the three-phase AC power supply to the high-speed mode, and the self-cleaning insulation system enters the high-efficiency cleaning mode, and removes the stubborn dust particles attached to the inner wall surface of the insulator body under high voltage.

[0018] Preferably, the leakage monitoring module is connected to the leakage microcurrent collection ring through a microcurrent sensor, the leakage monitoring module is connected to the intelligent computing module, the intelligent computing module is connected to the three-phase AC power supply, and the three-phase AC power supply is connected to the surface self-cleaning mechanism. The leakage monitoring module monitors the data collected by the microcurrent sensor through the leakage microcurrent collection ring in real time. If leakage is detected in the insulator body, the intelligent computing module immediately sends a signal to the control system of the three-phase AC power supply to adjust the output voltage of the three-phase AC power supply, thereby changing the standing wave AC electric field formed by the discharge electrode, and finally realizing the self-cleaning process of the insulation system to ensure the insulation performance and effect of the insulation system.

[0019] The technical effects of the present invention are:

[0020] The inner wall of the insulator body is covered with a surface self-cleaning system, and a leakage detection system is provided at the bottom end of the insulator body. In conjunction with the leakage monitoring module and the intelligent computing module, the operating quality of the insulation performance and self-cleaning performance of the inner wall of the insulator body can be detected online in real time, and the output voltage of the three-phase AC power supply can be intelligently corrected and precisely controlled. The present invention can quickly and effectively perform the self-cleaning function on the dust particles on the inner wall of the insulator body, and realize the real-time monitoring of the creepage phenomenon of the insulator, so that the insulation system has good insulation performance and is intelligent; at the same time, the intelligent self-cleaning insulation system can stably operate in complex working conditions of combustion flue gas (such as high temperature, high humidity, high resistivity and other special working conditions of combustion flue gas). For example, when the electrostatic precipitator processes high-humidity sulfur-containing flue gas, ordinary conical electric porcelain sleeves are used, and the creepage phenomenon caused by the insulator flashover occurs frequently, and the insulation fails; after the modification, the intelligent self-cleaning insulation system is used, and no creepage or leakage phenomenon is observed in the insulation system. The present invention is conducive to promoting the development and popularization of electrostatic precipitators in non-electrical industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the insulator body of the present invention being a straight electric porcelain sleeve;

[0023] Figure 3 It is a schematic diagram of the structure of the insulator body of the present invention being a conical electric porcelain sleeve;

[0024] Figure 4 It is a structural schematic diagram of the surface self-cleaning mechanism of the present invention;

[0025] Figure 5 It is a working flow chart of the intelligent power supply system of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0027] Example 1

[0028] Reference Figures 1 to 4, an anti-pollution flashover intelligent self-cleaning insulation system, comprising an insulator body 1, a surface self-cleaning mechanism 2, a leakage detection mechanism 3 and an intelligent power supply mechanism 4, wherein the surface self-cleaning mechanism is covered on the inner surface (inner wall) of the insulator body 1, and a leakage detection mechanism 3 is provided at the bottom end of the insulator body 1, wherein the leakage detection mechanism comprises a leakage micro-current collecting ring 5 and a micro-current sensor 6, wherein both the leakage micro-current collecting ring 5 and the micro-current sensor 6 are provided with leads, and the leakage micro-current collecting ring is connected to the micro-current sensor; the intelligent power supply mechanism 4 comprises a leakage monitoring module 7 for collecting micro-current signals, an intelligent computing module 8 for processing the output voltage, and a three-phase AC power supply 9.

[0029] The insulator body 1 has an outer shape of a straight porcelain sleeve or a tapered porcelain sleeve. The straight porcelain sleeve has an outer diameter of 300 to 700 mm, a wall thickness of 25 to 35 mm, and a height of 350 to 700 mm.

[0030] The wall thickness of the conical electric porcelain sleeve is 25-40 mm, the height is 400-800 mm, the outer diameter of the top circle is 100-450 mm, and the outer diameter of the bottom circle is 350-700 mm.

[0031] The surface self-cleaning mechanism 2 comprises a discharge electrode 10 and an insulating layer 11. The discharge electrode 10 is parallelly etched on the surface of the insulator body, and the insulating layer 11 is formed by spraying a dielectric film material on the discharge electrode 10 and the surface of the insulator body.

[0032] The arrangement of the discharge electrodes 10 is annular, forming a standing wave AC electric field between the discharge electrodes 10. This arrangement ensures that slight dust accumulation at the gaps between the discharge electrodes 10 will not form a continuous path on the surface of the insulator body 1, achieving better insulation performance and effect.

[0033] The spacing between the discharge electrodes 10 is 0.1-0.7 mm, which can ensure that the particles can form a continuous movement in the standing wave AC electric field formed between the discharge electrodes 10, thereby achieving better dust cleaning performance and effect.

[0034] The leakage micro-current collecting ring sleeve 5 is embedded in the insulator body 1. This arrangement can ensure the versatility of the insulation system and at the same time have stronger integrity.

[0035] The width of the leakage micro-current collecting ring sleeve 5 is 0.5-1 mm, which can ensure that the leakage micro-current is accurately captured without affecting the insulation performance of the insulator body 1.

[0036] The leakage micro-current collecting ring sleeve 5 is made of a metal with good electrical conductivity.

[0037] The micro-current sensor 6 is embedded in the insulator body 1. This arrangement can ensure the versatility of the insulation system and at the same time have stronger integrity.

[0038] The leakage monitoring module is connected to the leakage microcurrent collection ring through a microcurrent sensor, the leakage monitoring module is connected to the intelligent computing module, the intelligent computing module is connected to the three-phase AC power supply, and the three-phase AC power supply is connected to the surface self-cleaning mechanism.

[0039] Reference Figure 5 The leakage monitoring module 7 performs real-time leakage micro-current monitoring on the data collected by the micro-current sensor 6 through the leakage micro-current collection ring 5. If leakage is detected in the insulator body 1, the intelligent operation module 8 immediately sends a signal to the control system of the three-phase AC power supply 9 to adjust the output voltage of the three-phase AC power supply 9, thereby changing the standing wave AC electric field formed by the discharge electrode 10 and realizing the self-cleaning process of the insulation system. At the same time, the leakage monitoring module 7 continues to perform real-time leakage micro-current monitoring. If no leakage current is detected, the original state is maintained and continued to operate. If leakage current is still detected, the output voltage of the three-phase AC power supply 9 is continued to be adjusted through the intelligent operation module 8, ultimately ensuring the insulation performance and effect of the insulation system.

[0040] The output voltage of the three-phase AC power supply 9 is 200V, 400V, 600V, 800V, 1000V, 1200V, 1400V, 1600V and 1800V. 200V, 400V and 600V are low-range-particle shielding mode, 800V, 1000V and 1200V are medium-range-particle removal mode, and 1400V, 1600V and 1800V are high-range-high-efficiency cleaning mode. When the output voltage of the three-phase AC power supply 9 is in the low-speed mode, the self-cleaning insulation system has the function of shielding particle adhesion, so that most particles do not fall onto the surface of the insulator body 1; when there are many particles accumulated on the inner wall of the insulator body 1, the leakage monitoring module 7 captures the micro-current signal, and the intelligent operation module 8 automatically adjusts the output voltage of the three-phase AC power supply 9 to the mid-speed mode, and the self-cleaning insulation system enters the particle removal mode; if the dust particles on the inner wall of the insulator body 1 are still seriously accumulated and some particles cannot be removed, and the leakage monitoring module 7 still captures the micro-current signal, the intelligent operation module 8 automatically adjusts the output voltage of the three-phase AC power supply 9 to the high-speed mode, and the self-cleaning insulation system enters the high-efficiency cleaning mode, and removes the stubborn dust particles attached to the inner wall surface of the insulator body 1 under high voltage.

[0041] The intelligent operation module 8 is a device that converts the micro-current signal collected by the leakage monitoring module 7 into a power control signal through a genetic algorithm, a particle swarm algorithm, an ant colony algorithm, etc., to achieve precise control of the output voltage of the three-phase AC power supply 9.

[0042] Example 2

[0043] An intelligent self-cleaning insulation system for preventing pollution flashover has the same structure as that of Example 1.

[0044] This example is based on a coal-fired power generation unit with a capacity of 660MW in a power plant, burning high-sulfur coal with a sulfur content of 3.9%. A wet electrostatic precipitator is used to achieve efficient removal of particulate matter after the wet flue gas desulfurization device. The average mass concentration of sulfuric acid mist at the inlet of the precipitator is 36.7mg / m 3 The average median particle size of sulfuric acid mist is 0.097 μm.

[0045] The insulator body 1 has a conical electric porcelain sleeve shape, the conical electric porcelain sleeve has a wall thickness of 35 mm, a height of 520 mm, a top circle outer diameter of 350 mm, and a bottom circle outer diameter of 550 mm.

[0046] The distance between the discharge electrodes 10 is 0.2 mm.

[0047] The width of the leakage micro-current collecting ring sleeve 5 is 0.6 mm.

[0048] The wet electrostatic precipitator first uses an ordinary conical porcelain sleeve. After running for 30 minutes, sulfuric acid mist and particles adhere to the inner wall of the conical porcelain sleeve. The creepage phenomenon caused by the flashover of the insulator occurs frequently, and the insulation fails. After the transformation, the intelligent self-cleaning insulation system is used. The intelligent operation module 8 automatically selects the output voltage of the three-phase AC power supply 9 as the mid-range-particle removal mode of 1000V. The leakage monitoring module 7 does not capture the micro-current signal during the subsequent operation. The self-cleaning insulation system ensures good insulation performance and effect. It can be seen that the surface self-cleaning system 2 ensures the safety and stability of the insulation system in high humidity and high concentration flue gas.

[0049] Example 3

[0050] An intelligent self-cleaning insulation system for preventing pollution flashover has the same structure as that of Example 1.

[0051] This embodiment is based on a coal-fired power generation unit with a capacity of 1000MW in a power plant. A dry electrostatic precipitator is used to achieve efficient removal of particulate matter. After testing, the average median particle size of the flue gas particulate matter at the inlet of the dedusting device is 10μm. When the coal-fired power generation unit is running at 75% load, the average mass concentration of the particulate matter at the inlet of the dedusting device is 7g / m 3 When the coal-fired power generation unit is running at full load, the average mass concentration of particulate matter at the inlet of the dust removal device is 10g / m 3 .

[0052] The insulator body 1 has an outer shape of a straight porcelain sleeve, and the straight porcelain sleeve has an outer diameter of 460 mm, a wall thickness of 30 mm, and a height of 550 mm.

[0053] The distance between the discharge electrodes 10 is 0.3 mm.

[0054] The width of the leakage micro-current collecting ring sleeve 5 is 0.7 mm.

[0055] When the coal-fired generator set is running at 75% load, the intelligent operation module 8 automatically selects the output voltage of the three-phase AC power supply 9 to be 1200V in the mid-range-particle removal mode. When the coal-fired generator set is adjusted to full load operation, the leakage monitoring module 7 captures the micro-current signal, and the intelligent operation module 8 automatically adjusts the output voltage of the three-phase AC power supply 9 to 1400V in the high-end-high-efficiency cleaning mode. After running for 1 hour, the leakage monitoring module 7 captures the micro-current signal again. The dust particles on the inner wall of the insulator body 1 are still seriously accumulated, and some particles cannot be removed. The intelligent operation module 8 automatically adjusts the output voltage of the three-phase AC power supply 9 to 1600V in the high-end-high-efficiency cleaning mode. In the subsequent operation process, the leakage monitoring module 7 does not capture the micro-current signal again. The self-cleaning insulation system ensures good insulation performance and effect. It can be seen that the leakage detection system 3 can perform leakage monitoring online in real time, and cooperate with the intelligent power supply system 4 to perform intelligent adjustment of the working state, ensuring the safety and stability of the insulation system under different working conditions.

[0056] The present invention is described in detail above in conjunction with the embodiments, but the contents are only specific implementations of the present invention, and should not be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, all modifications and improvements made according to the scope of the application of the present invention should still fall within the scope of the patent of the present invention.

Claims

1. An intelligent self-cleaning insulation system for preventing pollution flashover, characterized in that: The intelligent self-cleaning insulation system includes an insulator body, a surface self-cleaning mechanism, a leakage detection mechanism and an intelligent power supply mechanism. The surface self-cleaning mechanism covers the inner surface of the insulator body. The bottom end of the insulator body is provided with a leakage detection mechanism. The leakage detection mechanism includes a leakage micro-current collection ring and a micro-current sensor. The leakage micro-current collection ring is connected to the micro-current sensor. The surface self-cleaning mechanism and the leakage detection mechanism are respectively connected to the intelligent power supply mechanism; the surface self-cleaning mechanism includes a discharge electrode and an insulating layer. The discharge electrode is etched in parallel on the surface of the insulator body. The insulating layer is formed by spraying a dielectric film material on the discharge electrode and the surface of the insulator body.

2. The intelligent self-cleaning insulation system for preventing pollution flashover according to claim 1 is characterized in that: The insulator body is a straight electric porcelain sleeve or a tapered electric porcelain sleeve.

3. The intelligent self-cleaning insulation system for preventing pollution flashover according to claim 2 is characterized in that: The straight electric porcelain sleeve has an outer diameter of 300-700mm, a wall thickness of 25-35mm, and a height of 350-700mm; the conical electric porcelain sleeve has a wall thickness of 25-40mm, a height of 400-800mm, a top circle outer diameter of 100-450mm, and a bottom circle outer diameter of 350-700mm.

4. The intelligent self-cleaning insulation system for preventing pollution flashover according to claim 1 is characterized in that: The discharge electrodes are arranged in a ring-shaped manner, and the interval between the discharge electrodes is 0.1-0.7 mm.

5. The anti-pollution flashover intelligent self-cleaning insulation system according to claim 1 is characterized by: The leakage micro-current collecting ring sleeve is embedded in the insulator body, and the micro-current sensor is embedded in the insulator body.

6. The anti-pollution flashover intelligent self-cleaning insulation system according to claim 1 is characterized by: The width of the leakage micro-current collecting ring sleeve is 0.5-1 mm.

7. The intelligent self-cleaning insulation system for preventing pollution flashover according to claim 1 is characterized in that: The intelligent power supply mechanism comprises a leakage monitoring module for collecting micro-current signals, an intelligent calculation module for processing output voltage, and a three-phase AC power supply.

8. The intelligent self-cleaning insulation system for preventing pollution flashover according to claim 7 is characterized in that: The output voltage of the three-phase AC power supply is nine levels of 200V, 400V, 600V, 800V, 1000V, 1200V, 1400V, 1600V and 1800V, among which 200V, 400V and 600V are low-range - particle shielding mode, 800V, 1000V and 1200V are mid-range - particle removal mode, and 1400V, 1600V and 1800V are high-range - high-efficiency cleaning mode.

9. The intelligent self-cleaning insulation system for preventing pollution flashover according to claim 7 is characterized in that: The leakage monitoring module is connected to the leakage microcurrent collection ring through a microcurrent sensor, the leakage monitoring module is connected to the intelligent computing module, the intelligent computing module is connected to the three-phase AC power supply, and the three-phase AC power supply is connected to the surface self-cleaning mechanism.

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