A self-filtering spray tower circulating water waste gas treatment system

Abstract

The utility model discloses a kind of self-filtering spray tower circulating water waste gas treatment systems, including tower body, circulating water pool, at least two layers of filler layer, spraying structure, microbubble generating unit, slag scraper and automatic slag discharge device, and the bottom of tower body is equipped with waste gas entrance, and the top of tower body is equipped with waste gas outlet, and tower body is equipped with circulating water pool;At least two layers of filler layer at least two layers of filler layer are vertically spaced and located in tower body: spraying structure includes multiple spraying heads evenly arranged above filler layer, and is communicated with circulating water pool by circulating pipeline;Microbubble generating unit is used to release microbubble to liquid layer of circulating water pool;Slag scraper is arranged at the liquid level of circulating water pool;Automatic slag discharge device is used to receive and handle the dross scraped by slag scraper.This application realizes the internal self-purification of spraying liquid, fundamentally solves the problem that traditional spray tower needs frequent water change due to water quality deterioration, achieves the goal of water-saving, energy-saving "zero water change".

Description

Technical Field

[0001] This utility model relates to the field of industrial waste gas treatment technology, and in particular to a self-filtering spray tower circulating water waste gas treatment system. Background Technology

[0002] The spray tower circulating water system is a crucial component in industrial waste gas treatment, and its structural design and technological maturity directly impact treatment efficiency and operational economy. Currently, this system typically consists of a waste gas inlet, packing layer, circulating water tank, water pumps and pipelines, spraying devices, and filters (such as high-efficiency filters, reverse osmosis membranes, or activated carbon filter units). Wastewater generated during the spraying process is initially filtered by the filters in the circulating water tank, then collected through guide plates and a recovery tank, and finally pumped back to the spray tower for reuse.

[0003] However, existing technologies require periodic shutdowns and water changes to maintain water quality, typically 2-3 times per month, increasing the operational and maintenance burden. Furthermore, the system generates considerable wastewater treatment costs and production downtime losses, driving up overall operating costs. In addition, pollutants transferred from the circulating water to the aqueous phase may cause secondary pollution, requiring further treatment. These problems severely restrict the widespread application and effectiveness of spray towers in waste gas treatment. Utility Model Content

[0004] The purpose of this utility model is to provide a self-filtering spray tower circulating water and waste gas treatment system to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0006] This utility model provides a self-filtering spray tower circulating water waste gas treatment system, including a tower body, a circulating water tank, at least two layers of packing material, a spray structure, a microbubble generating unit, a sludge scraper, and an automatic sludge discharge device. The tower body has a waste gas inlet at the bottom and a waste gas outlet at the top. The tower body includes a circulating water tank. At least two layers of packing material are vertically spaced within the tower body. The spray structure includes multiple spray heads evenly distributed above the packing material layers, connected to the circulating water tank via a circulation pipe. The microbubble generating unit releases microbubbles into the liquid layer of the circulating water tank. The sludge scraper is positioned on the surface of the circulating water tank to remove scum. The automatic sludge discharge device receives and processes the scum collected by the scraper. The purified water outlet of the circulating water tank is connected to the circulation pipe of the spray structure via a pipeline to return the purified water to the spray structure for recycling. The circulation pipe is connected to a circulating water pump.

[0007] The beneficial effects of this utility model are:

[0008] Industrial waste gas enters the spray tower from the bottom, and the spray liquid, atomized through nozzles, comes into countercurrent contact with the waste gas. The gas and liquid mix thoroughly in the packing layer, and pollutants are absorbed and transferred to the liquid phase. Micron-sized bubbles generated by the microbubble generation unit carry suspended solids to the surface for separation. The purified water is clear and is returned to the spray tower for reuse via a circulating pump. Surface scum is collected by a scraper and dewatered by a sludge press; the dried scum is transported off-site, and the filtrate is reused, achieving zero wastewater discharge. This application achieves internal self-purification of the spray liquid, fundamentally solving the problem of frequent water changes required by traditional spray towers due to water quality deterioration, achieving the water-saving and energy-saving goal of "zero water change." Simultaneously, pollutants are concentrated into dry scum and discharged, avoiding secondary pollution caused by large-scale wastewater discharge, resulting in significant environmental benefits.

[0009] As a further improvement to the above technical solution, the automatic slag discharge device includes an automatic slag press, which is provided with a filtrate outlet connected to the circulating water tank.

[0010] As a further improvement to the above technical solution, the microbubble generating unit includes a microbubble releaser and a dissolved air pump, wherein the dissolved air pump is connected to the microbubble releaser.

[0011] As a further improvement to the above technical solution, the microbubble releaser releases microbubbles with a particle size of 20 to 50 micrometers.

[0012] As a further improvement to the above technical solution, the tower body is provided with multiple detection ports, which are arranged vertically at intervals.

[0013] As a further improvement to the above technical solution, the channel diameter of the spray head is not less than 15 mm.

[0014] As a further improvement to the above technical solution, the slag scraper is a chain plate type slag scraper; the scraper part of the slag scraper is submerged below the liquid surface, and its operating speed is adjustable.

[0015] As a further improvement to the above technical solution, the scraper of the slag scraper is a rubber component, and its edge shape matches the cross-sectional shape of the circulating water tank to ensure that there are no dead corners in the slag scraping.

[0016] As a further improvement to the above technical solution, the filler layer includes multiple filler layers with different filler types and / or different filler densities.

[0017] As a further improvement to the above technical solution, the circulating water tank is equipped with a pH sensor. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1This utility model provides a self-filtering spray tower circulating water and waste gas treatment system.

[0020] Figure label:

[0021] Tower body 100, exhaust gas inlet 110, exhaust gas outlet 120, circulating water pool 130, detection port 140, packing layer 200, spray head 300, circulating pipeline 400, microbubble releaser 510, dissolved air pump 520, slag scraper 600, automatic slag discharge device 700, circulating water pump 800. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] Reference Figure 1 The present invention provides an embodiment of a self-filtering spray tower circulating water and waste gas treatment system:

[0027] A self-filtering circulating exhaust gas spray tower system is characterized by integrating a microbubble flotation unit with a circulating water tank 130 at the bottom of the spray tower, enabling internal self-purification and recycling of water. Daily operation requires no manual water replacement. Suspended solids and sediments separated by the air flotation system can be separated into mud and water by the deer press built into the microbubble flotation system, thus solving the problem of pollutant transfer in traditional spray tower systems.

[0028] The main body of the system is a vertical spray tower. The tower body 100 has an exhaust gas inlet at the bottom and an exhaust gas outlet 120 at the top. The tower body 100 has multiple detection ports 140, which are vertically spaced for observation and monitoring of the conditions inside the tower. Two layers of packing material 200 are arranged inside the tower from top to bottom. A spray structure is arranged above the packing layer 200, comprising multiple nozzles evenly distributed above the packing layer 200. The packing layer 200 uses large-diameter nozzles to prevent clogging, and the channel diameter of the spray heads 300 is no less than 15 mm to further prevent clogging; traditionally, the channel diameter is 8-10 mm. The bottom of the tower body 100 integrates a circulating water tank 130 that combines collection and treatment functions.

[0029] The circulating water tank 130 contains a microbubble flotation unit. The inlet pipe of a dissolved air pump 520 is connected to the purified water area in the lower part of the circulating water tank 130, and its outlet is connected to a microbubble releaser 510 located at the bottom of the tank. This releaser generates a large number of uniform micron-sized bubbles. The microbubble releaser 510 generates 20-50µm microbubbles under reduced pressure, carrying suspended solids to the surface. The purified water has a suspended solids concentration ≤30mg / L and a turbidity ≤15NTU. A surface scraper 600 is installed across the surface of the tank, smoothly scraping scum into a scum collection tank located at one end. The scum collection tank is connected to an automatic scum press, and the filtrate produced by the scum press is returned to the circulating water tank 130 through a pipe.

[0030] The system's workflow is as follows: Industrial waste gas enters from the bottom of the tower, and during its upward movement, it comes into countercurrent contact with the spray liquid. Pollutants are washed, absorbed, and transferred to the liquid phase, while the purified gas is discharged from the top of the tower. The wastewater, having absorbed pollutants, naturally flows back to the bottom circulating water tank 130 under gravity. The dissolved air pump 520 pressurizes the water in the tank, dissolves it in gas, and then delivers it to the microbubble releaser 510. The fine bubbles released under reduced pressure combine with suspended pollutants in the tank and carry them to the surface to form a scum layer. The scum scraper 600 works continuously to remove the scum and sends it to the scum press for dewatering, forming dry scum that is transported off-site, while the filtrate is returned to the system. The purified water, after flotation, remains in the lower part of the tank and is drawn by the circulating pump and transported to the top spray layer of the tower, completing the entire self-filtration cycle.

[0031] This system continuously purifies the circulating liquid through its built-in flotation unit, effectively solving the technical problems of traditional spray towers being prone to clogging and requiring frequent water changes, and achieving long-term, stable, and near-zero water consumption operation of the system.

[0032] The two packing layers 200 within the system employ a differentiated design. The upper packing layer 200 uses multi-faceted hollow spherical packing, which has a large porosity and is mainly used for the initial removal of larger particles in the exhaust gas and for uniform airflow distribution, effectively preventing clogging. The lower packing layer 200 uses structured honeycomb packing, which has a large specific surface area, designed to provide sufficient contact area for the gas and liquid phases, achieving efficient and deep absorption of pollutants such as acid mist and VOCs. This staged packing arrangement significantly improves the overall treatment efficiency and anti-clogging capability of the tower 100. Specifically, the packing layer 200 can be filled with quartz sand particles.

[0033] The slag scraper 600 is a chain-plate type. Its scraper is made of wear-resistant rubber, and the shape of its bottom edge perfectly matches the rectangular cross-section of the circulating water tank 130, ensuring that there are no dead angles in the slag scraping process. The operating speed of the slag scraper 600 can be frequency-controlled according to the amount of scum generated on the liquid surface, thus optimizing operating energy consumption while ensuring that the scum is removed in a timely manner.

[0034] The core of the automatic slag discharge device 700 is a disc filter press. The slag scraped into the collection trough by the slag scraper 600 is automatically fed into the feed inlet of the filter press via a screw conveyor. The filter press operates automatically under program control, using high-pressure extrusion to fully separate the water from the slag, ultimately producing a blocky filter cake with low moisture content. The filter cake falls into a storage bag below through the slag outlet for easy sealing and periodic removal. The filtrate produced by extrusion flows back to the circulating water tank 130 via pipeline, achieving fully closed-loop treatment and recycling of the material.

[0035] The inlet of the dissolved air pump 520 is directly connected to the purified water intake at the lower side wall of the circulating water tank 130 via a dedicated pipeline, thereby consistently drawing the cleanest water from the circulating water tank 130 to prepare dissolved air water. This ensures the high quality of the dissolved air water, avoids the potential wear and blockage risk to the microbubble generator 510 caused by residual microparticles in the water, and ensures the long-term stable operation of the microbubble generation system.

[0036] To further optimize the system's ability to treat acidic or alkaline waste gases and achieve refined control, a pH sensor is also installed in the circulating water tank 130.

[0037] The pH sensor uses corrosion-resistant electrodes, and its probe is directly immersed in the purified water layer in the lower part of the circulating water tank 130 to monitor the pH value of the circulating spray liquid in real time. The sensor's signal output is connected to the system's central control unit.

[0038] Based on real-time data from the pH sensor, the system achieves intelligent dosing control. When the pH value of the circulating liquid deviates from the preset optimal reaction range (for example, when the pH value rises during the treatment of acid mist exhaust gas), the control unit automatically starts the dosing pump to add a quantitative amount of acid or alkali solution to the circulating water tank, thereby automatically stabilizing the pH value of the circulating liquid within the required range.

[0039] This closed-loop control ensures that the spray liquid maintains a consistently high level of chemical absorption, which is particularly crucial for neutralizing acid or alkaline mist exhaust gases. It not only significantly improves pollutant removal efficiency but also effectively prevents equipment corrosion or packing scaling problems that may result from uncontrolled pH levels, further enhancing the automation level and operational reliability of the entire system.

[0040] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A self-filtering spray tower circulating water and waste gas treatment system, characterized in that, include: The tower body has an exhaust gas inlet at the bottom and an exhaust gas outlet at the top. The tower body is also equipped with a circulating water pool. At least two packing layers, wherein the at least two packing layers are arranged vertically spaced apart within the tower body: The spray structure includes multiple spray heads evenly arranged above the packing layer, which are connected to the circulating water tank through a circulation pipe; The microbubble generating unit is used to release microbubbles into the liquid layer of the circulating water tank; A scum scraper is installed on the surface of the circulating water tank to remove floating scum. An automatic slag discharge device is used to receive and process the slag collected by the slag scraper; The purified water outlet of the circulating water tank is connected to the circulation pipe of the spray structure through a pipeline to send the water purified by flotation back to the spray structure for recycling. The circulation pipe is connected to a circulating water pump.

2. The self-filtering spray tower circulating water and waste gas treatment system according to claim 1, characterized in that: The automatic slag discharge device includes an automatic slag press, which is equipped with a filtrate outlet connected to the circulating water tank.

3. The self-filtering spray tower circulating water and waste gas treatment system according to claim 1, characterized in that: The microbubble generating unit includes a microbubble releaser and a dissolved air pump, wherein the dissolved air pump is connected to the microbubble releaser.

4. The self-filtering spray tower circulating water and waste gas treatment system according to claim 3, characterized in that: The microbubble releaser releases microbubbles with a particle size of 20 to 50 micrometers.

5. The self-filtering spray tower circulating water and waste gas treatment system according to claim 1, characterized in that: The tower body is provided with multiple detection ports, which are arranged vertically at intervals.

6. The self-filtering spray tower circulating water and waste gas treatment system according to claim 1, characterized in that: The diameter of the spray head channel is not less than 15 mm.

7. The self-filtering spray tower circulating water and waste gas treatment system according to claim 1, characterized in that: The scraper is a chain-plate type scraper; the scraper plate part of the scraper is submerged below the liquid surface, and its operating speed is adjustable.

8. The self-filtering spray tower circulating water and waste gas treatment system according to claim 1, characterized in that: The scraper blade of the slag scraper is a rubber component, and its edge shape matches the cross-sectional shape of the circulating water tank to ensure that there are no dead corners in the slag scraping.

9. The self-filtering spray tower circulating water and waste gas treatment system according to claim 1, characterized in that: The filler layer includes multiple filler layers with different filler types and / or different filler densities.

10. The self-filtering spray tower circulating water and waste gas treatment system according to claim 1, characterized in that: The circulating water tank is equipped with a pH sensor.

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