Self-cleaning type exhaust gas multi-channel anti-blocking monitoring device

Abstract

The utility model discloses a kind of self-cleaning type waste gas multi-channel anti-blocking monitoring devices, realize multi-channel waste gas sampling by multi-pass switching valve, improve gas cleanliness in combination with two-stage filtration and condensation dehumidification pretreatment;Electric cylinder is driven to scrape component and remove filter screen impurities, while the inner wall of pipeline is cleaned by reverse pulse airflow;Intelligent control module triggers self-cleaning program according to differential pressure or timing strategy.The device can significantly reduce the risk of blockage, support multi-channel continuous monitoring, and is suitable for petrochemical, metallurgical and other high-dust, high-humidity conditions.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater waste heat recovery devices, specifically to a self-cleaning multi-channel anti-clogging monitoring device for exhaust gas. Background Technology

[0002] Existing exhaust gas monitoring devices in industrial applications generally face problems such as decreased detection accuracy and increased maintenance costs due to easy clogging of the filter structure. Traditional technologies using multi-channel gas monitoring systems commonly suffer from low pipeline reuse rates and insufficient automatic cleaning capabilities, making it difficult to guarantee continuous system operation. Furthermore, conventional cleaning devices have the following technical shortcomings: low mechanical cleaning efficiency (early solutions relied on manual intervention or simple scraping structures, failing to thoroughly remove adhesive contaminants); short filter component lifespan (fixed filters are prone to irreversible clogging over long-term use, requiring frequent replacement of core components); and poor multi-channel coordination (traditional patrol detection systems lack integrated anti-clogging design, increasing the risk of cross-contamination between channels). Utility Model Content

[0003] This utility model discloses a self-cleaning multi-channel anti-clogging monitoring device for exhaust gas. The device uses a multi-channel switching valve to achieve multi-channel exhaust gas sampling, and combines two-stage filtration and condensation dehumidification pretreatment to improve gas cleanliness.

[0004] A self-cleaning multi-channel anti-clogging monitoring device for exhaust gas includes an air intake channel connected to a filter with a filter screen. The air intake channel has multiple branch channels, which are switched on and off by a multi-channel switching valve. Each branch channel is equipped with a filter, a filter screen, and a solenoid valve. The filter screen is inside the filter and performs the filtering function. There are two filter screens, with the front screen having larger mesh size than the rear screen, forming a two-stage filtration. Each filter screen has an ash trough below it to collect particles blocked by the filter screen. The solenoid valve is located after the filter and is normally closed. It opens when the branch channel is ventilated.

[0005] A condenser dehumidifier is connected to the pipeline after the branch channel. A liquid collection tank is connected to the lower part of the condenser dehumidifier. A detection system is connected to the pipeline after the condenser dehumidifier. The condenser dehumidifier is used to remove water vapor from the exhaust gas.

[0006] It is equipped with a self-cleaning mechanism, including:

[0007] A mechanical scraping brush driven by an electric cylinder is placed on the windward side of the filter screen to periodically remove impurities from the surface of the filter screen.

[0008] A reverse pulse airflow air compressor is installed after the branch channels. Multiple branch channels are combined into one pipe, which is connected to an exhaust valve. The reverse pulse airflow air compressor is then connected after the exhaust valve to perform pulse purging on each branch channel.

[0009] Furthermore, an intelligent control module is provided, integrating a differential pressure sensor and a PLC controller. The differential pressure sensor is set before and after the filter screen, and the PLC controller is connected to the differential pressure sensor, electric cylinder, and the outlet valve of the reverse pulse airflow air compressor. The cleaning action is triggered according to the change in differential pressure or a preset cycle.

[0010] Preferably, the multi-channel switching valve is a rotary multi-way valve, whose valve core surface is covered with a wear-resistant ceramic coating, and the channel switching is achieved by servo motor drive.

[0011] Furthermore, a guide channel is provided below the mechanical scraping brush, the bottom edge of the guide channel is inclined, and the lower side of the bottom edge is connected to the ash trough.

[0012] Preferably, the jet pressure of the reverse pulse airflow air compressor is 0.4~0.6MPa.

[0013] Furthermore, the intelligent control module also integrates a wireless communication unit, supporting remote start and stop of the cleaning program and real-time uploading of blockage alarm signals.

[0014] The beneficial effects of this utility model are as follows: Multi-channel collaborative anti-blockage: By linking air path switching with self-cleaning action, long-term pressure on a single path is avoided; Composite cleaning mechanism: The combination of mechanical scraping (physical removal) and reverse airflow (dynamic stripping) improves cleaning efficiency; Intelligent operation and maintenance: Based on pressure difference sensing, the adaptive cleaning strategy reduces ineffective energy consumption. Attached Figure Description

[0015] Figure 1 This is a diagram of a self-cleaning multi-channel anti-clogging monitoring device for exhaust gas according to this utility model;

[0016] 1-Multi-channel switching valve, 2-Differential pressure sensor, 3-Condensation dehumidifier, 4-Detection system, 5-Liquid collection tank, 6-Reverse pulse airflow air compressor, 7-Ash trough, 8-Mechanical scraping brush, 9-Filter, 10-Filter screen, 11-Solenoid valve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1 A self-cleaning multi-channel anti-clogging monitoring device for exhaust gas is disclosed. The device includes an air intake channel connected to a filter 9, which has a filter screen 10. The air intake channel has multiple branch channels, each with its own filter 9, filter screen 10, and solenoid valve 11. The filter screen 10 is located inside the filter 9 and performs filtration. There are two filter screens 10, with the front screen having larger mesh sizes than the rear screen, forming a two-stage filtration process: first removing particles >50μm, then removing particles >5μm. Each filter screen 10 has a ash trough 7 below it to collect particles blocked by the filter screen. The solenoid valve 11 is located after the filter 9 and is normally closed. It opens when the corresponding branch channel is ventilated.

[0019] A condenser dehumidifier 3 is connected to the pipeline after the branch channel. A collection tank 5 is connected to the lower part of the condenser dehumidifier 3. A detection system 4 is connected to the pipeline after the condenser dehumidifier 3. The condenser dehumidifier 3 is used to remove water vapor from the exhaust gas. The condenser dehumidifier 3 uses a semiconductor cooling chip to cool the gas to 4 degrees Celsius and is equipped with a spiral air-water separator. The condensate collected in the collection tank 5 flows into the collection tank, which is equipped with a drain valve at the bottom and is opened periodically to discharge the water.

[0020] It is equipped with a self-cleaning mechanism, including:

[0021] A mechanical scraping brush 8, driven by an electric cylinder (stroke 100mm), is positioned on the windward side of the filter screen 10. Equipped with a displacement sensor to provide position feedback, it is linked to the electric cylinder stroke to control the movement. It reciprocates along the filter screen surface to scrape periodically (frequency 0.5Hz) remove impurities from the filter screen surface.

[0022] A reverse pulse airflow air compressor 6 is installed after the branch channels. Multiple branch channels are combined into one pipe, which is connected to an outlet valve. The reverse pulse airflow air compressor 6 is then connected after the outlet valve to perform pulse purging on each branch channel. The outlet valve is a 0.6MPa pulse solenoid valve assembly, which generates a reverse shock wave airflow (duration 200ms / cycle) through a venturi tube to backflush the branch channels.

[0023] The system is equipped with an intelligent control module, integrating a differential pressure sensor 2 and a PLC controller. The differential pressure sensor 2 is positioned before and after the filter 10. The PLC controller is connected to the differential pressure sensor 2, the electric cylinder, and the outlet valve of the reverse pulse airflow air compressor 6. It triggers the cleaning action of the self-cleaning mechanism based on changes in differential pressure or a preset cycle. The PLC main control module monitors in real time: the differential pressure before and after the filter (trigger threshold: ΔP≥3kPa); and the cumulative running time (timed cleaning interval: adjustable from 4-8 hours). The intelligent control module also integrates a wireless communication unit, supporting remote start and stop of the cleaning program and real-time uploading of blockage alarm signals (including filter blockage, condenser overload, etc.).

[0024] The multi-channel switching valve 1 is a rotary multi-way valve with a stainless steel body and a wear-resistant ceramic coating on the valve core surface. It is driven by a servo motor to achieve channel switching. The multi-channel switching valve 1 has a temperature range of -20 degrees to 200 degrees and can achieve cyclic switching of 1-8 branch channels. The branch channel pipelines are equipped with heat tracing lines (maintained at 60±5 degrees) to prevent condensation.

[0025] The mechanical scraping brush 8 is provided with a guide channel below it. The bottom edge of the guide channel is inclined and the lower side of the bottom edge is connected to the ash trough 7, so that the scraped dust can easily enter the ash trough 7 for collection.

[0026] The device operates as follows: A branch channel is opened via a multi-channel switching valve, opening the solenoid valve 11 of that branch channel while closing the solenoid valves 11 of other branch channels. Exhaust gas passes through the filter 10 and solenoid valves 11, reaching the condenser dehumidifier 3. The condenser dehumidifier 3 dehumidifies the exhaust gas before it enters the detection system 4 for gas detection. A reverse pulse airflow air compressor 6 performs pulse purging on the opened branch channel, blowing off dust adhering to the windward side of the filter 10, which falls into the ash trough 7. Mechanical scraping brushes 8 automatically open periodically to clean impurities from the filter surface. When a branch channel has been used for an extended period, or when the intelligent control module detects that the differential pressure exceeds the trigger threshold, and backflushing and scraping are ineffective, the multi-channel switching valve closes that branch channel and opens another branch channel, diverting the exhaust gas to that channel for treatment. The closed branch channel is then inspected, and the filter is replaced if necessary.

Claims

1. A self-cleaning multi-channel anti-clogging monitoring device for exhaust gas, wherein the monitoring device is provided with an air inlet channel, the air inlet channel is connected to a filter (9), and the filter is provided with a filter screen (10), characterized in that, The intake channel is provided with multiple branch channels. The branch channels are switched to be open or closed by a multi-channel switching valve (1). Each branch channel is provided with a filter (9), a filter screen (10), and a solenoid valve (11). The filter screen (10) is inside the filter (9) and plays a filtering role. There are two filter screens (10), with the mesh size of the front screen being larger than that of the rear screen, forming a two-stage filtration. Each filter screen (10) is provided with a ash trough (7) below it. The ash trough (7) is used to collect the particles blocked by the filter screen. The solenoid valve (11) is located after the filter (9). The solenoid valve (11) is normally closed. When the branch channel is open, the solenoid valve (11) is opened. A condenser dehumidifier (3) is connected to the pipeline after the branch channel. A liquid collection tank (5) is connected to the lower part of the condenser dehumidifier (3). A detection system (4) is connected to the pipeline after the condenser dehumidifier (3). The condenser dehumidifier (3) is used to remove water vapor from the exhaust gas. It is equipped with a self-cleaning mechanism, including: A mechanical scraping brush (8) driven by an electric cylinder is set on the windward side of the filter screen (10) to periodically remove impurities from the surface of the filter screen. A reverse pulse airflow air compressor (6) is installed after the branch channel. Multiple branch channels are combined into one pipe, and an exhaust valve is connected to the pipe. The reverse pulse airflow air compressor (6) is connected after the exhaust valve to perform pulse purging on each branch channel.

2. The self-cleaning anti-clogging monitoring device according to claim 1, wherein: It is equipped with an intelligent control module that integrates a differential pressure sensor (2) and a PLC controller. The differential pressure sensor (2) is set in front of and behind the filter screen (10). The PLC controller is connected to the differential pressure sensor (2), the electric cylinder, and the outlet valve of the reverse pulse airflow air compressor (6). It triggers the cleaning action of the self-cleaning mechanism according to the change of differential pressure or the preset cycle.

3. The self-cleaning multi-channel anti-clogging monitoring device for exhaust gas according to claim 1, characterized in that: The multi-channel switching valve (1) is a rotary multi-way valve with a wear-resistant ceramic coating on its valve core surface and channel switching is achieved by servo motor drive.

4. The self-cleaning anti-clogging monitoring device according to claim 1, wherein: The mechanical scraping brush (8) is provided with a guide groove below it. The bottom edge of the guide groove is inclined and the lower side of the bottom edge is connected to the ash trough (7).

5. The self-cleaning anti-clogging monitoring device according to claim 1, wherein: The jet pressure of the reverse pulse airflow air compressor (6) is 0.4 to 0.6 MPa.

6. The self-cleaning anti-clogging monitoring device according to claim 2, wherein: The intelligent control module also integrates a wireless communication unit, which supports remote start and stop of the cleaning program and real-time uploading of blockage alarm signals.

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