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Low-pressure-drop spiral coil type membrane element

A low pressure drop and membrane element technology, applied in the field of filters in water purification devices, can solve the problems of increased operating energy consumption and ignoring operating costs, and achieve the effects of high water flow rate, reduced resistance, and reduced system energy consumption

Inactive Publication Date: 2012-07-18
SHANDONG JOZZON MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the operation of membrane elements, pressure plays a very important role in the filtration process of membrane elements. In the actual operation process, pressure loss is an important index to evaluate the energy consumption of the whole system. In the past, in the process of membrane element design, only the membrane The anti-fouling performance and manufacturing cost of components, while ignoring the operating cost, increases the operating energy consumption

Method used

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  • Low-pressure-drop spiral coil type membrane element
  • Low-pressure-drop spiral coil type membrane element
  • Low-pressure-drop spiral coil type membrane element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] When designing membrane elements with the same diameter and the same membrane area, ensure that other raw materials and design parameters are consistent, and only increase the number of sheets of rolled diaphragms to reduce the pressure drop of the designed membrane element system by 10%-15%.

[0020] Taking the 8-inch membrane element as an example, the membrane area is 400ft 2 , under the condition that the performance of the diaphragm remains the same, two kinds of membrane elements are designed, and the number of diaphragm sheets is 20 and 30 respectively. The initial performance test of the two membrane elements and the comparison of the average system pressure drop for 5 months of long-term operation on the two systems (a single system is 4 membrane elements connected in series). Table 1 shows the test results of the two systems. The inlet water pressure of the membrane element system is 225psi, and the inlet water salt concentration is 2000ppm.

[0021] Table 1...

Embodiment 2

[0024] When designing membrane elements with the same diameter and the same membrane area, ensure that other raw materials and design parameters are consistent, and only increase the width of the water inlet flow channel (that is, increase the thickness of the water inlet flow channel cloth), so that the flow resistance of the water inlet inside the membrane element is reduced, so that After calculation, the pressure drop of the membrane element system is reduced by 20%-25%.

[0025] Taking the 8-inch membrane element as an example, the membrane area is 400ft 2 , under the condition that the performance of the diaphragm remains the same, two kinds of membrane elements are designed, and the widths of the water inlet channels are 28mil and 34mil respectively. The initial performance test of the two membrane elements and the comparison of the average system pressure drop for 5 months of long-term operation on the two systems (a single system is 4 membrane elements connected in se...

Embodiment 3

[0029] When designing membrane elements with the same diameter and the same membrane area, ensure that other raw materials and design parameters are consistent, and correspond to the actual operation of membrane elements through computer theoretical simulation. The water flow rate can reduce the resistance of the water running inside the membrane element, so that the calculated pressure drop of the membrane element system can be reduced by 25%-30%.

[0030] Theoretical basis: Carry out specific assumptions based on the structure of the 8-inch membrane element, and perform simulation calculations. In this simulation calculation, the channel width is selected as 28mil, the water inlet angle is simulated from 30 degrees to 120 degrees, and the diagonal length of the inlet channel grid is From 1.553mm-5.196mm (different diagonal lengths and longitude and latitude distances are different). After theoretical simulation, the relationship between water entry angle and pressure drop is...

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Abstract

The invention relates to a membrane element design method capable of reducing running presser drop of a single spiral coil type membrane and system and a low-pressure-drop membrane element optimized and designed with the method. In a process coiling the membrane element, coiling page number, length of each page, width of a water inlet runner and a water inlet angle of the membrane element are comprehensively designed according to total membrane area. In a running process using the single membrane elements with the same size and the same membrane area, water inlet resistance is smallest, flow resistance of inlet water in the membrane element is smallest, pressure loss is smallest, and accordingly energy consumption of the whole membrane casing and the system is reduced. Compared with the prior art, pressure drop of the low-pressure-drop membrane element is reduced by 50% to 55%, and energy consumption of the system is greatly reduced.

Description

technical field [0001] The invention relates to a rolling design method for reducing the pressure drop of a spiral-wound membrane element and its product, belonging to the technical field of filters in water purification devices. Background technique [0002] Membrane technology is widely used for its simplicity, high packing density, good water quality, suitable for automatic operation, and convenient maintenance. At present, the membrane elements used for filtration devices in membrane technology mainly include: spiral wound membrane elements, hollow fiber membrane elements , Tubular membrane elements, plate and frame membrane elements, etc., due to the compact design and low price of coiled membrane elements, they occupy a large part of the market share. These include microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes, electrodialysis membranes, pervaporation membranes, etc. These membrane elements use the separation ...

Claims

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Application Information

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IPC IPC(8): B01D69/06
Inventor 王丽华邓子华
Owner SHANDONG JOZZON MEMBRANE TECH
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