Large-flux low-energy-consumption membrane element

Abstract

The utility model provides a large-flux low-energy-consumption membrane element, which belongs to the technical field of membrane separation and comprises a central pipe, a water inlet separation net and a membrane bag unit, the membrane bag units are nanofiltration membrane bag units or reverse osmosis membrane bag units, and a plurality of layers of water inlet separation nets and membrane bag units are sequentially stacked and wound on the central pipe; the membrane bag unit is of a rectangular three-layer structure, the first layer and the third layer are membranes, the second layer in the middle is a water production flow guide net, the three rectangular edges of the membrane bag unit are sealed, the fourth edge is connected with the center pipe, the water inlet partition net is of a double-layer net structure, the partition net A layer is parallel lines in the water flow direction, and the partition net B layer is oblique interweaving lines. The membrane element disclosed by the utility model has the characteristics of smooth flow channel, small resistance, large flux and low energy consumption, and is suitable for deep purification treatment of various water qualities.

Description

Technical Field

[0001] The utility model belongs to the technical field of membrane separation, and specifically relates to a large-flux and low-energy-consumption membrane element. Background Art

[0002] Membrane separation technology refers to the technology of selectively separating a mixture of molecules of different particle sizes at the molecular level when passing through a semipermeable membrane. The semipermeable membrane is also called a separation membrane or a filter membrane. The membrane wall is covered with small holes. According to the pore size, it can be divided into: microfiltration membrane (MF), ultrafiltration membrane (UF), nanofiltration membrane (NF), reverse osmosis membrane (RO), etc. Membrane separation is a new separation technology that appeared in the early 20th century and rose rapidly after the 1960s. Membrane separation technology has the functions of separation, concentration, purification and refinement, and has the characteristics of high efficiency, energy saving, environmental protection, molecular filtration and simple filtration process, and easy control. Therefore, it has been widely used in food, medicine, biology, environmental protection, chemical industry, metallurgy, energy, petroleum, water treatment, electronics, bionics and other fields, generating huge economic and social benefits, and has become one of the most important means in today's separation science.

[0003] A unit consisting of a membrane, a support for fixing the membrane, a spacer, and a container that holds these components is called a membrane assembly / element. The types of membrane assemblies / elements include tubular, hollow fiber curtain, flat, roll, and disc tube types. Nanofiltration and reverse osmosis generally use roll type.

[0004] In the rolled membrane element, the membrane bag (one or more) is wound around the axis and the permeate collection tube together with the mesh separation layer, wherein the mesh separation layer between the membrane bags not only ensures the flow of the raw liquid through the channel spacing, but also improves the flow conditions on the membrane surface and controls the concentration polarization on the membrane surface. Summary of the invention

[0005] In order to give full play to the role of the mesh separation layer in ensuring circulation, reducing resistance, preventing concentration polarization and membrane surface pollution, the utility model is proposed to provide a membrane element with large flux and low energy consumption.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a large-flux, low-energy consumption membrane element, including a central tube, a water inlet spacer and a membrane bag unit; the membrane bag unit is a nanofiltration membrane bag unit or a reverse osmosis membrane bag unit, and the water inlet spacer and the membrane bag unit are several layers stacked and wound on the central tube in sequence; the membrane bag unit is a rectangular three-layer structure, the first and third layers are membranes, and the second layer in the middle is a water production diversion net or diversion cloth, the three sides of the rectangle of the membrane bag unit are sealed, and the fourth side is connected to the central tube, the water inlet spacer is a double-layer net structure, the spacer A layer is a parallel line along the direction of water flow, and the spacer B layer is an oblique interwoven line.

[0007] Compared with the prior art, the utility model has the characteristics of unobstructed flow channel and small resistance, and therefore has the advantages of large flux and low energy consumption, and is particularly suitable for nanofiltration membranes and reverse osmosis membrane elements for deep purification of various water qualities. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the membrane element;

[0009] Figure 2 It is a structural schematic diagram of the membrane bag unit;

[0010] Figure 3 It is a schematic diagram of the water inlet screen;

[0011] Among them, 1 is a central tube, 2 is a water inlet screen, 3 is a membrane bag unit, 4 is a membrane, 5 is a water production guide screen, 6 is a screen A layer, and 7 is a screen B layer. DETAILED DESCRIPTION

[0012] The present invention is described in detail below in conjunction with the embodiments and drawings. This embodiment is a non-limiting embodiment of the present invention.

[0013] Embodiment 1, the high-flux, low-energy consumption reverse osmosis membrane element of this embodiment comprises a central tube (1), a water inlet spacer (2) and a membrane bag unit (3); the membrane bag unit (3) is a reverse osmosis membrane bag unit, the water inlet spacer (2) and the membrane bag unit (3) are two layers stacked in sequence and wound on the central tube; the membrane bag unit (3) is a rectangular three-layer structure, the first and third layers are membranes (4), the second middle layer is a water production diversion net (5), the three sides of the rectangle of the membrane bag unit are sealed, and the fourth side is connected to the central tube, the water inlet spacer is a double-layer net structure, the spacer A layer (6) is a parallel line along the direction of water flow, and the spacer B layer (7) is an oblique interwoven line.

[0014] Embodiment 2, the high-flux, low-energy consumption nanofiltration membrane element of this embodiment comprises a central tube (1), a water inlet spacer (2) and a membrane bag unit (3); the membrane bag unit (3) is a nanofiltration membrane bag unit, the water inlet spacer (2) and the membrane bag unit (3) are two layers stacked in sequence and wound on the central tube; the membrane bag unit (3) is a rectangular three-layer structure, the first and third layers are membranes (4), the second middle layer is a water production diversion net (5), the three sides of the rectangle of the membrane bag unit are sealed, and the fourth side is connected to the central tube, the water inlet spacer is a double-layer net structure, the spacer A layer (6) is a parallel line along the direction of water flow, and the spacer B layer (7) is an oblique interwoven line.

[0015] The beneficial effects of the utility model include: the water inlet screen is a double-layer screen structure, the flow channel is unobstructed, the resistance is small, the flux of the membrane element is large, and the energy consumption is low.

Claims

1. A high flux and low energy consumption membrane element, characterized by: It includes a central tube, a water inlet spacer and a membrane bag unit; the membrane bag unit is a nanofiltration membrane bag unit or a reverse osmosis membrane bag unit, and the water inlet spacer and the membrane bag unit are several layers stacked in sequence and wound on the central tube; the membrane bag unit is a rectangular three-layer structure, the first and third layers are membranes, and the second layer in the middle is a water production diversion net, the three sides of the rectangle of the membrane bag unit are sealed, and the fourth side is connected to the central tube, the water inlet spacer is a double-layer net structure, the spacer A layer is a parallel line along the direction of water flow, and the spacer B layer is an oblique interwoven line.

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