Insulator air sealing system of wet electric dust collector with adjusting plate

Abstract

The utility model relates to the technical field of dust collectors, in particular to an insulator air sealing system of a wet electric dust collector with an adjusting plate, which comprises a main air supply unit, a distribution module, a redundancy protection unit and a pressure closed-loop control module. The main air supply unit conveys dry hot air to the main pipe through an air adjusting door, a high-pressure centrifugal fan, an electric heater and the like. The distribution module distributes the air volume to each insulator chamber through an air volume adjusting plate as required, and dynamically adjusts the air volume according to the feedback of the temperature measuring resistor; the redundant protection unit realizes seamless switching within 3 seconds through a standby pipeline; the pressure closed-loop module adjusts the pressure of the mother pipe in real time to be higher than the internal pressure of the dust remover. The system balances the temperature of each insulator chamber, prevents moisture permeation, improves the system reliability, and is suitable for high-humidity and high-pressure scenes such as thermal power and chemical engineering.

Description

Technical Field

[0001] This utility model relates to the field of dust collector technology, specifically an insulator air sealing system for a wet electrostatic precipitator with an adjustment plate. Background Technology

[0002] A wet electrostatic precipitator (WESP) is a high-voltage electrostatic dust removal device used to treat humid gases. It primarily removes dust, acid mist, water droplets, aerosols, odors, PM2.5, and other harmful substances from humid gases, making it an ideal device for controlling atmospheric dust pollution. WESPs, often abbreviated as WESP, operate on the same basic principle as dry electrostatic precipitators, involving three stages: charging, collection, and cleaning.

[0003] Currently, wet electrostatic precipitators are widely used in thermal power plants for the purification of flue gas after wet desulfurization. The flue gas after wet desulfurization is high-pressure flue gas, and the wet electrostatic precipitator has an anode spray system. Due to the high pressure, this part of the flue gas is prone to carrying moisture.

[0004] In a wet scrubber, all insulators are installed in an insulator chamber, which contains heating elements and temperature control sensors to prevent condensation and to prevent moisture from entering the porcelain bushing and causing creepage. Due to the different positions of the insulators, the air intake of the air seal system varies, resulting in different internal temperatures for some insulators.

[0005] Therefore, the development of a sealing system capable of adjusting the airflow inside the insulator room is essential. Utility Model Content

[0006] The purpose of this invention is to provide an insulator air sealing system with an adjustable plate wet electrostatic precipitator to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An insulator air sealing system with a wet electrostatic precipitator with an adjustment plate includes a main air supply unit, a distribution module, a redundant protection unit, and a pressure closed-loop control module.

[0009] The main air supply unit includes a regulating damper, a main fan, a plate check valve, an expansion joint, an electric butterfly valve, and an electric heater connected in sequence.

[0010] Its specific connection path is: outside air → damper → main fan → plate check valve → expansion joint → electric butterfly valve → electric heater → main pipe. Through the above process, dry hot air can be provided to the main pipe and then distributed to the rear.

[0011] The distribution module includes multiple branch pipes connected to the main pipe. The end of each branch pipe is connected to an insulator chamber via an airflow adjustment plate. The insulator chamber contains a temperature measuring resistor, and the opening and closing angle of the corresponding airflow adjustment plate is dynamically adjusted based on temperature feedback.

[0012] Its specific connection path is: main pipe → multiple branch pipes → air volume adjustment plate → insulator compartment;

[0013] The redundancy protection unit includes a backup pipeline connected in parallel with the main air supply unit. The backup pipeline also includes a backup fan, a plate check valve, an expansion joint, and an electric butterfly valve. When the main fan fails, the backup fan starts within 3 seconds, the electric butterfly valve at the outlet of the original fan closes, and the electric butterfly valve in the backup pipeline opens to ensure uninterrupted air supply.

[0014] The pressure closed-loop control module includes a pressure transmitter installed on the main pipe and a local pressure gauge. By cooperating with the air damper, it achieves the purpose of making the pressure of the sealing system higher than the internal pressure of the dust collector.

[0015] A pressure transmitter is installed on the main pipe → the signal is transmitted to the PLC / DCS → the opening of the damper and the speed of the fan are controlled to maintain a constant pressure in the main pipe (e.g., 5.2 kPa) and ensure that the pressure of the sealing system is always higher than the internal pressure of the dust collector (about 0.3-0.5 kPa).

[0016] Compared with the prior art, the beneficial effects of this utility model are: the air volume of each insulator chamber is accurately distributed through the air volume adjustment plate, eliminating temperature differences;

[0017] The redundant protection unit ensures that the system switches within 3 seconds in the event of a main fan failure, ensuring uninterrupted system operation.

[0018] The pressure closed-loop control module maintains constant pressure in the main pipe and prevents moisture backflow.

[0019] Replaceable perforated plates reduce maintenance costs and adapt to different operating conditions. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an insulator air seal system for a wet electrostatic precipitator with an adjustment plate.

[0021] The components include: 1. Air damper; 2. Main fan; 3. Plate check valve; 4. Expansion joint; 5. Electric butterfly valve; 6. Electric heater; 7. Local pressure gauge; 8. Pressure transmitter; 9. Air volume adjustment plate; 10. Insulator chamber; 11. Temperature measuring resistor; and 12. Spare piping. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] Please see Figure 1 An insulator air sealing system with a wet electrostatic precipitator with an adjustment plate includes a main air supply unit, a distribution module, a redundant protection unit, and a pressure closed-loop control module.

[0027] The main air supply unit includes a regulating damper 1, a main fan 2, a plate check valve 3, an expansion joint 4, an electric butterfly valve 5, and an electric heater 6 connected in sequence.

[0028] Its specific connection path is: outside air → damper 1 → main fan 2 → plate check valve 3 → expansion joint 4 → electric butterfly valve 5 → electric heater 6 → main pipe. Through the above process, dry hot air can be provided to the main pipe and then distributed to the rear.

[0029] The distribution module includes multiple branch pipes connected to the main pipe. The end of each branch pipe is connected to an insulator chamber 10 via an airflow adjustment plate 9. The insulator chamber 10 has a built-in temperature measuring resistor 11, which dynamically adjusts the opening and closing angle of the corresponding airflow adjustment plate 9 through temperature feedback.

[0030] Its specific connection path is: main pipe → multiple branch pipes → air volume adjustment plate 9 → insulator compartment 10;

[0031] The redundant protection unit includes a backup pipeline 12 connected in parallel with the main air supply unit. The backup pipeline 12 also includes a backup fan, a plate check valve 3, an expansion joint 4, and an electric butterfly valve 5. When the main fan 2 fails, the backup fan starts within 3 seconds, the electric butterfly valve 5 at the outlet of the original fan closes, and the electric butterfly valve 5 in the backup pipeline opens to ensure uninterrupted air supply.

[0032] The pressure closed-loop control module includes a pressure transmitter 8 installed on the main pipe and a local pressure gauge 7. By cooperating with the regulating damper 1, it achieves the purpose of making the pressure of the sealing system higher than the internal pressure of the dust collector.

[0033] A pressure transmitter 8 is installed on the main pipe → the signal is transmitted to the PLC / DCS → the opening of the regulating damper 1 and the fan speed are controlled, so as to maintain the pressure of the main pipe constant (e.g. 5.2 kPa) and ensure that the pressure of the sealing system is always higher than the internal pressure of the dust collector (about 0.3-0.5 kPa).

[0034] In this embodiment of the invention, the main pipe is a horizontal or vertical main pipe connecting the outlet of the electric heater 6 to each branch pipe, and is the core gas transmission channel connecting the main fan 2, the standby fan, the electric heater 6 and the insulator chamber.

[0035] The main pipe is located downstream of the electric heater 6 and is in the form of a main pipe. It is connected to multiple branch pipes by flanges or welding. The end of each branch pipe is connected to the corresponding insulator chamber 10 through the air volume adjustment plate 9.

[0036] In a preferred embodiment of the present invention, the air volume adjustment plate 9 is a replaceable perforated plate with a gradient distribution of pore size to achieve uniform airflow diffusion.

[0037] Expansion joint 4 adopts a metal-non-metal composite structure with an axial compensation of ≥20mm;

[0038] The switching response time of backup pipeline 12 is ≤3s, ensuring that the pressure fluctuation in the insulator chamber is ≤5%;

[0039] The temperature sensing resistor 11 is a PT100 type with a temperature measurement accuracy of ±0.5℃. The data is connected to the DCS system to realize temperature-airflow PID closed-loop control.

[0040] As a preferred embodiment 1 of the present invention, this system should be equipped with a wet electrostatic precipitator in a 1000MW coal-fired unit:

[0041] Installation and configuration:

[0042] The main fan 2 is a 9-26 type high-pressure centrifugal fan with an air volume of 8000 m³ / h and an air pressure of 4500 Pa.

[0043] The air volume adjustment plate 9 is made of 304 stainless steel perforated plate with three groups of hole diameters: 5mm / 8mm / 12mm, which are configured according to the gradient of the insulator chamber position.

[0044] Operating procedure: Before starting, open the regulating damper 1 to 50% opening, then start the main fan 2, and stabilize the main pipe pressure at 5.2 kPa (0.3 kPa higher than the dust collector pressure) through the pressure transmitter 8.

[0045] The DCS system collects the temperature of each insulator compartment 10 in real time. If the temperature of a compartment is lower than the set value (e.g., 65℃), the opening of the corresponding air volume adjustment plate 9 is increased to increase the heating air volume.

[0046] Fault drill: Simulates a power outage of the main fan 2. When the pressure transmitter 8 detects that the pressure has dropped to 4.5 kPa, the standby fan starts within 3 seconds, the electric butterfly valve 5 switches synchronously, and the pressure is restored to 5.0 kPa.

[0047] During the switching process, the temperature fluctuation of each insulator chamber was ≤3℃, and the protection shutdown was not triggered.

[0048] As a preferred embodiment 2 of the present invention, this system should be used in high-temperature and high-humidity chemical waste gas treatment scenarios:

[0049] Replace the air volume adjustment plate 9 with an electric louvered regulating valve to achieve automatic and continuous adjustment of the opening degree;

[0050] Expansion joint 4 is made of fluororubber non-metallic material and is resistant to temperatures above 200℃.

[0051] The system pressure control accuracy is ±0.5 kPa, the annual failure rate is reduced to 0.3 times / year, and the remaining installation configuration and operation process are the same as in Example 1.

[0052] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An air seal system for an insulator of a belt adjuster wet electrostatic precipitator, characterized by, include The main air supply unit consists of a regulating damper (1), a main fan (2), a plate check valve (3), an expansion joint (4), an electric butterfly valve (5), and an electric heater (6) connected in sequence, and is used to provide dry hot air; The distribution module includes multiple branch pipes connected to the main air supply unit main pipe. The end of the branch pipe is connected to the insulator chamber (10) through the air volume adjustment plate (9). The insulator chamber (10) is equipped with a temperature measuring resistor (11). The redundant protection unit includes a backup pipeline (12) connected in parallel with the main air supply unit. The backup pipeline includes a backup fan, a plate check valve (3), an expansion joint (4), and an electric butterfly valve (5). The pressure closed-loop control module consists of a pressure transmitter (8) and a damper (1) on the main pipe, which maintains the pressure of the main pipe higher than the internal pressure of the dust collector.

2. The insulator air-sealing system according to claim 1, characterized in that, The air volume adjustment plate (9) is set as a replaceable perforated plate with the pore size distributed in a gradient.

3. The insulator air-sealing system according to claim 1, characterized in that, The expansion joint (4) is a metal-nonmetal composite structure.

4. The insulator air-sealing system according to claim 1, characterized in that, The temperature measuring resistor (11) is a PT100 type with a temperature measurement accuracy of ±0.5℃. The data is connected to the DCS system to realize temperature-airflow PID closed-loop control.

5. The insulator air-sealing system according to claim 1, characterized in that, The pressure of the outlet main pipe of the electric heater (6) is fed back to the damper (1) and the main fan (2) through the pressure transmitter (8) to maintain the pressure at a constant 5.2 kPa, which is 0.3-0.5 kPa higher than the dust collector pressure.

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