An automatic flushing inertial impaction defogging system and its usage method

Abstract

This invention discloses an automatic flushing inertial collision-type demister system and its usage method, belonging to the field of industrial waste gas purification and treatment technology. The system includes a demister body, a water supply unit, a drainage unit, and a control unit. The demister body has a first treatment section, a second treatment section, and a third treatment section arranged sequentially along the airflow direction. The water supply unit provides washing water to the first and third treatment sections, the drainage unit collects the wastewater discharged from the second and third treatment sections, and the control unit controls the linkage operation between the water supply unit and the demister body. Through the synergistic design of the multi-stage treatment structure and the automatic flushing function, this invention can efficiently capture fine mist droplets in dust-laden wet flue gas, effectively prevent dirt accumulation, and has the advantages of high separation efficiency, stable operation, strong adaptability to working conditions, and convenient maintenance. It is suitable for the purification and treatment of exhaust gas from humidifying mixers in industries such as chemical, building materials, and environmental protection.

Description

Technical Field

[0001] This invention belongs to the field of industrial waste gas purification and treatment technology, specifically relating to an inertial collision-type demisting system for the outlet of a humidifying mixer, and more particularly to a demisting system with integrated automatic flushing function, suitable for efficient collection of mist droplets and dust in dusty wet flue gas, and its usage method. Background Technology

[0002] As a widely used process equipment, humidifying mixers generate a large amount of hot, humid waste gas carrying mist droplets, water vapor, and a small amount of dust during the mixing process. If this waste gas is discharged directly without effective treatment, it can easily cause emissions to exceed standards in the surrounding environment of the factory. In severe cases, the combined pollution of dust and mist droplets can have a lasting impact on the atmospheric environment and surrounding residents. Therefore, efficient purification of the exhaust gas from humidifying mixers has become a key step for the industry to implement environmental protection policies and achieve cleaner production.

[0003] Currently, the industry mainly uses single-stage demisters or simple spray scrubbing devices to treat this type of waste gas. However, practical applications have shown that existing technologies have the following shortcomings:

[0004] First, existing single-stage demisting equipment mostly adopts simple baffle or wire mesh structures, which have limited effect on capturing fine mist droplets with a particle size of less than 10μm. The demisting efficiency is generally low, and under the conditions of high exhaust gas humidity and significant fluctuations in dust content, the outlet flue gas still carries a large number of tiny mist droplets and dust.

[0005] Secondly, after dust-laden droplets accumulate on the surface of the demisting element over a long period of time, they gradually form a stubborn layer of dirt, which causes the equipment pressure drop to rise continuously and the separation efficiency to decline rapidly. Users often need to stop the machine frequently for manual cleaning.

[0006] Third, the existing equipment uses independent operation for water supply, flushing, and main unit start-up and shutdown. In actual operation, problems such as water shortage, untimely flushing, and motor overload are prone to occur, resulting in a high equipment failure rate.

[0007] Fourth, in low-temperature environments, the plastic or composite material blades in existing equipment are prone to brittle cracking, and there is also a risk of icing due to condensation inside the equipment. Under high-temperature or high-humidity conditions, some structures are prone to thermal deformation or corrosion damage. In addition, the equipment inlet and outlet are mostly rigidly connected, which is prone to resonance caused by fan vibration or airflow pulsation, resulting in structural fatigue and noise pollution.

[0008] Fifth, the existing demisters have insufficient cleaning nozzle coverage, resulting in cleaning dead zones. Furthermore, the blade area is mostly designed as a closed structure, making it inconvenient for manual inspection and thorough cleaning.

[0009] In summary, existing exhaust gas treatment equipment for humidifying mixers has significant shortcomings in terms of demisting efficiency, anti-clogging capability, operational reliability, adaptability to operating conditions, and ease of maintenance. Developing a multi-stage demisting device with high separation efficiency, automatic cleaning function, stable operation, and adaptability to complex operating conditions has become an urgent technical problem to be solved in this field. Summary of the Invention

[0010] To address the problems of low demisting efficiency, easy clogging, poor operational reliability, insufficient adaptability to working conditions, and inconvenient maintenance in existing humidifying mixer exhaust gas treatment equipment, this invention provides an automatic flushing inertial collision demisting system and its usage method. Through the coordinated design of a multi-stage treatment structure and an automatic flushing function, it achieves efficient capture of mist droplets and dust in dusty wet flue gas and ensures long-term stable operation of the system.

[0011] To achieve the above objectives, the present invention provides an automatic flushing inertial collision-type demisting system, comprising a demisting body, a water supply unit, a drainage unit, and a control unit.

[0012] The demister body has a first processing section, a second processing section and a third processing section arranged sequentially along the airflow direction. The water supply unit provides washing water to the first processing section and the third processing section, the drainage unit collects the wastewater discharged from the second processing section and the third processing section, and the control unit is used to control the linkage operation between the water supply unit and the demister body.

[0013] Specifically, the demister body includes a first compartment constituting a first processing section, a second compartment constituting a second processing section, and a third compartment constituting a third processing section.

[0014] The first chamber contains the main unit, and the first chamber also has a main unit inlet for receiving washing water from the water supply unit. After the airflow enters the first chamber, it mixes thoroughly with the washing liquid.

[0015] The second chamber is equipped with a dehydration system and a first drain outlet. The mixed airflow is dehydrated here, and the separated wastewater is discharged into the drainage unit through the first drain outlet.

[0016] The third compartment contains integrated blades and a pre-flushing system and a post-flushing system for cleaning the integrated blades. The third compartment is equipped with a flushing inlet and a second drain outlet. The flushing inlet receives flushing water from the water supply unit, while the second drain outlet discharges the wastewater generated after flushing into the drainage unit. The core component of the integrated blades in the third compartment captures residual mist droplets in the airflow onto the blade surface through inertial collision, centrifugal separation, and gravity settling. The droplets then converge into a liquid film and are discharged into the second drain outlet.

[0017] The water supply unit includes a clean water tank, which is connected to the main unit compartment water inlet and the rinsing water inlet via clean water pipes, thereby providing washing water and rinsing water to the first compartment and the third compartment respectively; the drainage unit includes a turbid water tank, which is connected to the first drain outlet and the second drain outlet via turbid water pipes, for collecting dust-containing wastewater discharged from each compartment.

[0018] Furthermore, the clean water tank is equipped with an external water source interface to connect to an external water source, ensuring a continuous and stable water supply; the turbid water tank is equipped with a sewage discharge pipe to facilitate the unified discharge or treatment of collected wastewater.

[0019] In addition, the system also includes a humidifying mixer and a manifold. The humidifying mixer is connected to the air inlet of the demister body through the manifold. The dust-laden wet flue gas generated by multiple humidifying mixers is collected and sent to the demister body for treatment. The air outlet of the demister body is connected to the atmosphere, and the purified gas is directly discharged into the atmosphere.

[0020] Based on the above system, the present invention also provides a method for using an automatic flushing inertial collision-type demisting system, including a gas-liquid mixing and separation step and an automatic flushing step.

[0021] The gas-liquid mixing and separation steps are as follows: the dust-laden wet flue gas generated by the humidifying mixer is introduced into the demister body and flows through the first treatment section, the second treatment section and the third treatment section in sequence; in the first treatment section, the airflow is mixed with the washing liquid from the water supply unit; in the second treatment section, the mixed airflow is dehydrated; in the third treatment section, the mist droplets in the airflow are captured on the surface of the integrated blades through inertial collision, centrifugal separation and gravity sedimentation, and then discharged after condensing into a liquid film, and the purified gas is discharged into the atmosphere.

[0022] The automatic flushing process is as follows: During the operation of the demister body, the water supply unit is controlled by the control unit to provide flushing water to the third treatment section according to the preset cycle. The front flushing system and the rear flushing system respectively flush both sides of the integrated blades to remove the dirt accumulated on the blade surface.

[0023] To further optimize the operating effect, this method also includes a start-up linkage step and a shutdown linkage step. In the start-up linkage step, the control unit controls the demister body and the water supply unit to start synchronously, so that the first treatment section and the third treatment section can obtain washing water at the same time, and automatically perform a flushing at the same time as starting. In the shutdown linkage step, the control unit controls the demister body and the water supply unit to stop synchronously, and automatically perform an automatic flushing step after stopping.

[0024] In addition, the control unit can automatically trigger an additional flushing procedure when it detects abnormal operation of the demister body or reaches the preset maintenance cycle, ensuring that the system is always in good operating condition.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Through a multi-stage treatment structure of gas-liquid mixing in the first chamber, dehydration in the second chamber, and inertial collision separation in the third chamber, fine mist droplets are effectively captured, ensuring that the exhaust gas meets emission standards.

[0027] 2. Front and rear flushing systems are installed on both sides of the integrated blades, combined with periodic automatic flushing, to prevent dirt accumulation from causing increased pressure drop and reduced efficiency. In addition, the water supply unit is linked with the demister body for control, eliminating water shortage operation and untimely flushing, and reducing equipment failure rate.

[0028] 3. The multi-compartment modular design facilitates the adjustment of operating parameters. The separation of the clean water tank and the turbid water tank ensures the quality of flushing water. Multiple control modes, such as start-up linkage, shutdown linkage, and abnormal triggering, meet the needs of different working conditions.

[0029] 4. Each compartment has observation ports for easy real-time monitoring, and the control system has protection functions such as overheating, overload, and phase loss to ensure long-term safe operation.

[0030] In summary, this invention effectively solves the problems of low defogging efficiency, easy clogging, poor operational reliability, insufficient adaptability to working conditions, and inconvenient maintenance in existing technologies, and has good application prospects. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of an automatic flushing inertial collision-type defogging system provided in an embodiment of the present invention.

[0032] Figure 2 for Figure 1 Enlarged schematic diagram of the demister.

[0033] Figure 3 A process flow diagram of an automatic flushing inertial collision-type demisting system provided in an embodiment of the present invention.

[0034] In the diagram: 1. Humidifying mixer; 2. Manifold; 3. Demister; 301. Air inlet; 302. Air outlet; 303. Observation port; 4. First compartment; 401. Main unit; 402. Main unit compartment water inlet; 5. Second compartment; 501. Dehydration system; 502. First drain outlet; 6. Third compartment; 601. Integrated blades; 602. Front flushing system; 603. Rear flushing system; 604. Flushing water inlet; 605. Second drain outlet; 7. Dual-purpose water tank; 701. Clean water tank; 702. Turbid water tank; 703. External water source interface; 704. Clean water pipe; 705. Turbid water pipe; 706. Sewage pipe. Detailed Implementation

[0035] To enhance understanding of the present invention, the invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only for explaining the invention and do not constitute a limitation on the scope of protection of the invention.

[0036] like Figures 1 to 3 As shown, this embodiment provides an automatic flushing inertial collision-type defogging system, which mainly includes four parts: a defogging unit 3, a water supply unit, a drainage unit, and a control unit.

[0037] Among them, the demister 3 is the core processing equipment of this system. Its interior is arranged with a first processing section, a second processing section and a third processing section in sequence along the airflow direction, which correspond to the first compartment 4, the second compartment 5 and the third compartment 6 respectively.

[0038] The water supply unit is used to provide washing water and rinsing water to the first and third treatment sections, the drainage unit is used to collect the wastewater discharged from the second and third treatment sections, and the control unit is used to control the linkage operation between the water supply unit and the demister 3.

[0039] Specifically, there are several humidifying mixers 1, and their outlets are connected to the manifold 2 through pipes. The manifold 2 collects the dust-laden wet flue gas generated by the multiple humidifying mixers 1 and sends it into the demister 3 through the air inlet 301.

[0040] The air outlet 302 of the demister 3 is connected to the atmosphere, which is used to directly discharge the purified gas into the atmosphere. The housing of the demister 3 is also provided with an observation port 303, which makes it convenient for operators to observe the internal operating status in real time.

[0041] The demister 3 has a first chamber 4, a second chamber 5, and a third chamber 6 arranged sequentially along the airflow direction.

[0042] The first chamber 4 is equipped with a main unit 401, which has an impeller inside. The first chamber 4 is also equipped with a main unit chamber water inlet 402. The main unit chamber water inlet 402 is connected to the clean water tank 701 through a clean water pipe 704 and is used to receive washing water from the water supply unit. When the dust-laden wet flue gas enters the first chamber 4, it is fully mixed with the washing liquid under the action of the impeller of the main unit 401 to form a gas-liquid mixture.

[0043] The second chamber 5 is equipped with a dehydration system 501, which is used to dehydrate the gas-liquid mixture from the first chamber 4, separating most of the water and coarse dust particles; the second chamber 5 is also equipped with a first drain outlet 502, through which the separated wastewater is discharged into the drainage unit.

[0044] The third compartment 6 is equipped with an integrated blade 601 and a front flushing system 602 and a rear flushing system 603 for cleaning the integrated blade 601. The third compartment 6 is also equipped with a flushing inlet 604 and a second drain outlet 605. The flushing inlet 604 is connected to the clean water tank 701 through a clean water pipe 704 to receive flushing water. The second drain outlet 605 is connected to the drainage unit to discharge the wastewater generated after flushing.

[0045] As the core separation element of this invention, the integrated blade 601 captures the fine mist droplets remaining in the airflow on the blade surface through the combined effects of inertial collision, centrifugal separation and gravity settling. After the mist droplets gather into a liquid film, they are discharged along the blade flow channel and finally enter the drainage unit through the second drain port 605.

[0046] The water supply unit includes a water purification tank 701, which is equipped with an external water source interface 703 for connecting to an external water source. The water purification tank 701 is also connected to the main unit compartment water inlet 402 and the rinsing water inlet 604 through water purification pipes 704, thereby providing washing water and rinsing water to the first compartment 4 and the third compartment 6, respectively.

[0047] The drainage unit includes a turbid water tank 702, which is connected to the first drain outlet 502 and the second drain outlet 605 via turbid water pipes 705. It is used to collect the dust-containing wastewater discharged from each compartment. The turbid water tank 702 is also equipped with a sewage pipe 706, which is used to discharge the collected wastewater into the ditch or sewage treatment system.

[0048] The control unit is electrically connected to the main unit 401, the water supply unit, and the flushing system respectively, and is used to control the coordinated operation of each part. Specifically, the control unit can realize the synchronous start and stop of the main unit 401 and the water supply unit, and can automatically trigger the front flushing system 602 and the rear flushing system 603 to flush the integrated blade 601 according to a preset cycle. In addition, the control unit also has protection functions such as overheating, overload, and phase loss to ensure the safe operation of the equipment.

[0049] During operation, the control unit controls the system's start-up, shutdown, and flushing according to a preset program.

[0050] When the equipment is started, the control unit controls the host 401 to start synchronously with the water supply unit, so that the first chamber 4 and the third chamber 6 can simultaneously obtain washing water and rinsing water, and automatically perform a rinsing at the same time as starting up to ensure that the integrated blade 601 is clean in the initial state.

[0051] When the equipment is running, the control unit automatically triggers the front flushing system 602 and the rear flushing system 603 according to the preset cycle to flush the front and rear sides of the integrated blade 601. The flushing time and flushing pressure can be adjusted according to the actual working conditions.

[0052] When the equipment stops, the control unit controls the host 401 to stop synchronously with the water supply unit, and automatically performs a flush after stopping to remove any dirt that may remain on the blade surface after shutdown.

[0053] When the control unit detects that the demister 3 is malfunctioning or has reached the preset maintenance cycle, it can also automatically trigger an additional flushing procedure to ensure that the system is always in good operating condition.

[0054] For blind spots that are difficult to cover by automatic flushing, the system has reserved a space for manual cleaning on the top of the shell of the third compartment 6. Operators can open the side flange and use the flushing nozzle to manually clean the integrated blades 601.

[0055] In terms of maintenance, operators should regularly observe the internal condition of each compartment through the observation port 303, check whether there is obvious dirt accumulation on the surface of the integrated blade 601, and check whether the first drain port 502 and the second drain port 605 are unobstructed.

[0056] Implementation Example

[0057] Taking a building materials company as an example, the company has three humidifying mixers 1 for mixing and stirring materials. During the mixing process, a large amount of hot and humid exhaust gas carrying mist droplets and dust is generated.

[0058] Before the upgrade, the company used a single-stage wire mesh demister, which had a demisting efficiency of less than 80% and required shutdown for cleaning every two weeks, seriously affecting the continuity of production. White smoke was visible in the exhaust gas, and the company was ordered to rectify the situation by the environmental protection department multiple times.

[0059] After adopting the automatic flushing inertial collision type demisting system provided by the present invention, the outlet pipes of the three humidifying mixers 1 are respectively connected to the manifold pipe 2, and after the manifold, they are sent into the demister 3 through the air inlet 301.

[0060] After the system is installed, the operator sets the automatic flushing cycle to 30 minutes and the flushing pressure to 2.5 bar through the control unit. After the equipment is started, the main unit 401 and the water supply unit operate synchronously. The dust-laden wet flue gas flows through the first chamber 4, the second chamber 5 and the third chamber 6 in sequence. After gas-liquid mixing, dehydration and inertial collision separation, the purified gas is discharged into the atmosphere through the air outlet 302.

[0061] After three months of continuous operation, the demisting efficiency was found to be stable at over 99%, the outlet flue gas was colorless and transparent, meeting environmental emission standards, the system's automatic flushing function was operating normally, there was no obvious scale buildup on the surface of the integrated blade 601, and the equipment pressure drop was consistently maintained within the range of 40-80Pa, significantly lower than the 120-200Pa before the modification. During operation, operators only needed to conduct a routine inspection once a week through the observation port 303 and manually inspect the side flange of the third compartment 6 every two weeks. No stubborn dirt requiring manual cleaning was found, and the equipment did not stop due to blockage or malfunction.

[0062] In terms of maintenance costs, the company used to have to shut down the machine twice a month for manual cleaning, with each cleaning requiring 3 people and 4 hours.

[0063] After adopting this invention, annual maintenance only requires routine inspection and nozzle cleaning once a quarter, while avoiding production losses caused by downtime. In addition, the system operates stably without water shortage, motor overload or other faults, and the service life of the equipment is expected to be more than doubled compared to the original equipment.

[0064] This example fully demonstrates that the present invention can effectively solve the problems of low demisting efficiency, easy clogging, and poor operational reliability of existing humidifying mixer outlet exhaust gas treatment equipment, and has good technical effects.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic flushing inertial impaction-type defogging system, characterized in that, include: The demister body, water supply unit, drainage unit, and control unit; The demister body is provided with a first processing section, a second processing section and a third processing section arranged sequentially along the airflow direction; The water supply unit provides washing water to the first treatment section and the third treatment section; The drainage unit collects the wastewater discharged from the second treatment section and the third treatment section; The control unit controls the coordinated operation of the water supply unit and the demister body.

2. The automatic flushing inertial collision-type defogging system according to claim 1, characterized in that, The demister body includes: a first compartment constituting the first processing section, a second compartment constituting the second processing section, and a third compartment constituting the third processing section; The first compartment is equipped with a main unit, and the first compartment is equipped with a main unit compartment water inlet to receive washing water from the water supply unit; The second chamber is equipped with a dehydration system, and the second chamber is equipped with a first drain outlet to discharge wastewater into the drainage unit; The third compartment is equipped with integrated blades and a pre-rinsing system and a post-rinsing system for cleaning the integrated blades. The third compartment is equipped with a rinsing inlet and a second drain outlet. The rinsing inlet receives rinsing water from the water supply unit, and the second drain outlet discharges wastewater into the drainage unit.

3. The automatic flushing inertial collision-type defogging system according to claim 2, characterized in that, The water supply unit includes a clean water tank, which is connected to the main unit compartment water inlet and the flushing water inlet via clean water pipes; the drainage unit includes a turbid water tank, which is connected to the first drain outlet and the second drain outlet via turbid water pipes.

4. The automatic flushing inertial collision-type defogging system according to claim 3, characterized in that, The clean water tank is equipped with an external water source interface for connecting to an external water source, and the turbid water tank is equipped with a sewage discharge pipe for discharging wastewater.

5. The automatic flushing inertial collision-type demisting system according to claim 2, characterized in that, It also includes a humidifying mixer and a manifold, wherein the humidifying mixer is connected to the air inlet of the demister body through the manifold, and the air outlet of the demister body is connected to the atmosphere.

6. A method of using an automatic flushing inertial impaction-type defogging system, characterized in that, The process includes the following steps: gas-liquid mixing and separation, and automatic rinsing. The gas-liquid mixing and separation step includes introducing dust-laden wet flue gas generated by the humidifying mixer into the demister body, which flows sequentially through the first processing section, the second processing section, and the third processing section; in the first processing section, the gas flow is mixed with washing liquid from the water supply unit; in the second processing section, the mixed gas flow undergoes dehydration treatment; in the third processing section, the mist droplets in the gas flow are captured on the surface of the integrated blades through inertial collision, centrifugal separation, and gravity sedimentation, and then discharged after forming a liquid film, and the purified gas is discharged into the atmosphere; The automatic rinsing step includes, during the operation of the demister body, controlling the water supply unit to provide rinsing water to the third processing section according to a preset cycle via the control unit to rinse the integrated blades.

7. The method of use according to claim 6, characterized in that, It also includes a startup linkage step: the control unit controls the demister body and the water supply unit to start synchronously, so that the first processing section and the third processing section can obtain washing water at the same time.

8. The method of use according to claim 6, characterized in that, In the automatic flushing step, the water supply unit flushes both sides of the integrated blade through the front flushing system and the rear flushing system, respectively.

9. The method of use according to claim 6, characterized in that, It also includes a shutdown linkage step: the control unit controls the demister body and the water supply unit to stop synchronously, and automatically performs the automatic flushing step once after stopping.

10. The method of use according to claim 6, characterized in that, When the control unit detects an abnormal operation of the demister body or the arrival of a preset maintenance cycle, it automatically triggers an additional flushing procedure.

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