Online cleaning tubular membrane system
By cleaning the tube membrane system online, solid particles are used to form a fluidized bed under gravity and injector pressurization, the problems of dirt blockage and filter cake blockage in the inner wall of the tube membrane are solved, and the long-term and efficient operation of the membrane is achieved and the reduction of energy consumption and wastewater is achieved.
Patent Information
- Application Number
- CN202311736913.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-18
- Publication Date
- 2025-06-27
AI Technical Summary
The prior art is difficult to effectively solve the problems of dirt blockage in the inner wall of the tube membrane and filter cake blockage, resulting in reduced membrane working efficiency, increased energy consumption and wastewater generation, affecting the normal operation of filtration.
An online cleaning tube membrane system is designed, which uses solid particles to enter the tube membrane under the action of gravity and injector pressurization to form a fluidized bed, and cleansing is achieved through frequent contact and friction with the inner wall of the membrane, and wastewater treatment is achieved through circulating water tanks and sewage valves.
It realizes the online self-cleaning of tubular membranes without stopping, ensuring long-term and efficient continuous operation of the equipment, reducing energy consumption and wastewater generation, and extending the service life of the membrane.
Smart Images
Figure CN120204933A_ABST
Abstract
Description
[0001] The present invention belongs to an in-pipe dirt cleaning device and method, which is applied to solve the problems of tubular membrane pollution and cake blockage. It can clean the inner wall of the tubular membrane online, prevent and remove the attachment and scaling of the inner membrane pollutants in the above-mentioned tube, and ensure the normal operation of the tubular membrane with high efficiency in a long cycle. Background Art
[0002] Tubular membranes are widely used in many industries such as water treatment, chemical engineering, and energy. However, with the increase of the usage time, dirt blockage and adhesion inevitably exist on the inner wall of the tubular membrane, resulting in the reduction of the working efficiency of the above-mentioned tubular membrane, the increase of resistance and energy consumption, affecting the normal operation of filtration. In severe cases, it is necessary to stop the machine for cleaning, and a large amount of cleaning wastewater needs to be treated during cleaning, which in turn increases the investment in wastewater treatment equipment and treatment costs. Developing an in-line cleaning system for tubular membranes can improve the working efficiency of the filtration system, effectively extend the operation time of the device, reduce energy consumption, reduce the generation of wastewater, save water resources, and has great economic benefits.
[0003] In order to solve the fouling and cake blockage of the tubular membrane, people generally adopt the cross-flow method of high-speed water flow, and use the high-speed water flow generated by the large flow of the water pump to impact the membrane surface to reduce the surface fouling, but it cannot completely solve the problem of membrane surface fouling, especially has limited effect on high-organic matter water quality, and the energy consumption of the water pump is huge. There is an urgent need for a better solution.
[0004] In order to solve the fouling problem of the existing tubular membrane, an in-line cleaning system for tubular membranes has been invented. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide an in-line cleaning system for tubular membranes, which can realize the in-line cleaning of the tubular membrane, avoid the surface pollution and cake generation of the tubular membrane, and maintain the normal operation of the tubular membrane in a long cycle and operate efficiently.
[0006] To achieve the above object, the technical solution of the present invention is realized as follows:
[0007] An on-line cleaning tube membrane system of the present invention comprises a tube membrane 1, a membrane tube 2, a membrane circulation outlet pipe 3, a filter cap 4, a blowdown valve 5, a blowdown pipe 6, solid particles 7, a storage chamber 8, a particle regulating valve 9, an injector 10, a pressurizing pump 11, a circulation inlet pipe 12, a filtrate outlet 13, a circulation water tank 14 and a control system. Its characteristics are as follows: both the tube membrane 1 and the storage chamber 8 are vertical structures. The tube membrane can be multiple membranes, and the volume of the storage chamber is 1-2 times larger than the volume of the content of a single tube membrane to be cleaned (including the volume of the connecting pipes and components). The suction port of the injector 10 is connected to the solid particles 7 through the particle regulating valve 8 at the bottom of the storage chamber 8. The water inlet of the injector is connected to the water outlet of the pressurizing pump 11, and the water outlet of the injector 10 is connected to the circulation inlet pipe 12 of the tube membrane to be cleaned. The specific gravity of the solid particles 3 is greater than 1, the particle size is 0.05-1.5 mm, and the volume of the solid particles is 0.1-1.5 times the volume of the content of the tube membrane to be cleaned. The membrane circulation outlet pipe 3 is tangentially connected to the upper part of the storage chamber 8. The filter cap 4 is located at the top of the storage chamber 8, and the screen aperture of the filter cap is smaller than the particle size of the solid particles. The circulation water tank 14 is connected to the pressurizing pump 11 and the blowdown pipe 6, and the circulation water tank 14 can operate under full closed pressure or normal pressure.
[0008] The on-line cleaning tube membrane system is characterized in that the solid particles enter the injector under the dual action of gravity and the suction force generated by the injector under the action of the pressurizing pump, are pressurized by the injector and then enter the tube membrane to be cleaned from the outlet of the injector, form a fluidized bed in the tube membrane and move upward, and flow out from the tube membrane circulation outlet pipe and enter the storage chamber. The solid particles 7 fall back into the storage chamber under the action of gravity and are ready to participate in the next cycle.
[0009] The on-line cleaning tube membrane system is characterized in that the cleaning intensity inside the tube is determined by comprehensive factors such as controlling the flow velocity of the fluid inside the tube, the specific gravity and content of the solid particles, the selection of the solid particles, and the flow state of the fluid inside the tube.
[0010] The on-line cleaning tube membrane system is characterized in that a set of storage chamber system can be combined with multiple tube membranes, and on-line cleaning of multiple tube membranes can be realized through the control system.
[0011] The beneficial effects of the present invention: It can realize on-line non-stop self-cleaning of the tube membrane, ensuring long-term, efficient and continuous operation of the equipment. Description of the Drawings
[0013] Figure 1 It is a general structural schematic diagram of the on-line cleaning tube membrane system described in the present invention.
[0014] Figure 2 It is a general application structural schematic diagram of the on-line cleaning tube membrane system described in the present invention, and the tube membrane is of a multiple structure.
[0015] The present invention will be further described below in conjunction with the accompanying drawings.
[0016] As shown in the Figure 1 accompanying drawings, it is a schematic diagram of the overall structure of an on-line cleaning tubular membrane system according to the present invention. As Figure 1 shown, during operation, the solid particle regulating valve 9, the sewage discharge valve 5 are opened, and the pressurizing pump 11 is started. Under the action of the pump, the ejector 10 generates a suction effect to suck the solid particles 7 in the storage chamber 8, pressurize them, and then enter the tubular membrane through the ejector outlet and the membrane circulation inlet pipe 12. During the flow of the solid particles along with the water in the tubular membrane, they frequently come into contact with and rub against the inner wall of the membrane tube, achieving the purpose of cleaning the dirt on the inner wall of the membrane tube. As the water continues to flow, the mixture of solid particles 7 and water flows out from the other end of the tubular membrane, tangentially enters the storage chamber 8 through the membrane circulation outlet pipe 3, and separates. The solid particles 7 move downward in the storage chamber under the action of gravity and participate in the next cycle again; water and substances lighter than water, such as oil, move upward through the filter cap under the action of buoyancy, and enter the circulation water tank 14 through the sewage discharge valve 5 and the sewage discharge pipe, thus completing the circulating cleaning of the tubular membrane.
[0017] As shown in the Figure 2 accompanying drawings, it is an overall structure schematic diagram of the application of an on-line cleaning tubular membrane system according to the present invention, where the tubular membrane is multiple. As Figure 2 shown, the tubular membranes are three in parallel, each tubular membrane circulation inlet pipe is provided with a valve, and the circulation water outlet is provided with a check valve, and a water supply pump system is added. During operation, the inlet valve of the tubular membrane to be cleaned is opened, and the other two are in the closed state. The solid particle regulating valve 9, the sewage discharge valve 5 are opened, and the pressurizing pump 11 is started. Under the action of the pump, the ejector 10 generates a suction effect to suck the solid particles 7 in the storage chamber 8, pressurize them, and then enter the tubular membrane through the ejector outlet and the valve of the membrane circulation inlet pipe. During the flow of the solid particles along with the water in the tubular membrane, they frequently come into contact with and rub against the inner wall of the membrane tube, achieving the purpose of cleaning the dirt on the inner wall of the membrane tube. As the water continues to flow, the mixture of solid particles 7 and water flows out from the other end of the tubular membrane, tangentially enters the storage chamber 8 through the check valve and the membrane circulation outlet pipe, and separates. The solid particles 7 move downward in the storage chamber under the action of gravity and participate in the next cycle again; water and substances lighter than water, such as oil, move upward through the filter cap under the action of buoyancy, and enter the circulation water tank 14 through the sewage discharge valve 5 and the sewage discharge pipe. The same operation is performed on the other two tubular membranes in turn, thus completing the circulating cleaning of the entire tubular membrane.
Claims
1. An online cleaning tubular membrane system, comprising a tubular membrane, membrane tubes, a membrane circulation outlet pipe, filter caps, drain valves, drain pipes, solid particles, a storage chamber, a particle regulating valve, an injector, a pressurizing pump, a circulation inlet pipe, a filtrate outlet, a circulation water tank and a control system, characterized in that: Both the tubular membrane and the storage chamber are vertical structures. The tubular membrane can be multiple membranes, and the volume of the storage chamber is 1 - 2 times greater than the volume of the content in a single tubular membrane tube to be cleaned (including the volume of the connecting pipes and components). The suction port of the injector is connected to the solid particles through a particle regulating valve at the bottom of the storage chamber. The water inlet of the injector is connected to the outlet of the pressure pump, and the water outlet of the injector is connected to the circulating water inlet pipe of the tubular membrane to be cleaned. The specific gravity of the solid particles is greater than 1, the particle size is 0.05 - 1.5 mm, and the volume of the solid particles is 0.1 - 1.5 times the volume of the content of the tubular membrane to be cleaned. The membrane circulating water outlet pipe is tangentially connected to the upper part of the storage chamber. The filter cap is located at the top of the storage chamber, and the mesh aperture of the filter cap is smaller than the particle size of the solid particles. The circulating water tank is connected to the pressure pump and the sewage pipe, and the circulating water tank can operate under fully enclosed pressurized or atmospheric pressure.
2. The on-line cleaning tubular membrane system according to claim 1, characterized in that: The high-pressure fluid at the inlet of the injector can be the action of a pressure pump or the action of other high-pressure fluids.
3. The on-line cleaning tubular membrane system according to claim 1, characterized in that: The specific gravity of the solid particles is less than 1, and the material is not limited. It can be a single material or a combination of multiple materials.
4. An on-line cleaning tubular membrane system according to claim 1, characterized in that: To enhance the cleaning effect, one or more combinations of the following are adopted: increasing the specific gravity of the solid particles, the concentration of solid particles in the fluid, the flow rate of the fluid, and setting turbulators in the pipe.
5. An on-line cleaning tubular membrane system according to claim 1, characterized in that: This device is suitable for cleaning membrane filtration equipment with pipes and channels with a diameter greater than 0.05 mm, such as tubular membranes and plate membranes, and multiple membranes can be connected in parallel.