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On-line defect diagnosis method for rolling type reverse osmosis membrane device

A technology of reverse osmosis membrane and diagnosis method is applied in the field of online diagnosis of defects of roll reverse osmosis membrane device, which can solve the problems of reducing membrane device performance, membrane fouling, uneven fluid flow, etc., and achieves low equipment cost and application scope. Wide, simple and convenient diagnostic procedures

Inactive Publication Date: 2006-11-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned defects exist in the membrane, thereby reducing the performance of the membrane
Relevant studies have shown that this uneven fluid flow can cause a great negative impact on the CaSO in the roll-type reverse osmosis membrane. 4 and CaCO 3 The research on the fouling problem shows that the most prone to fouling is the contact point between the membrane surface and the separator, even when the main solution is not saturated, the membrane has fouled

Method used

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  • On-line defect diagnosis method for rolling type reverse osmosis membrane device
  • On-line defect diagnosis method for rolling type reverse osmosis membrane device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this example, a diagnostic test is performed on a new SWC1 roll-type reverse osmosis membrane device with a diameter of 8 inches from Hyde Energy.

[0018] Install the tracer NaCl solution injection container and injection valve at the inlet of the roll-type reverse osmosis membrane device, and connect it to a 60bar high-pressure air bottle; install a high-speed response conductivity meter at the outlet of the roll-type reverse osmosis membrane device and connect it to the computer.

[0019] Adjust the inlet water pressure and the inlet water flow rate of the membrane device to stabilize to the set value. When performing the residence time distribution test, the pulse mode is used. Open the valve for 1 second, and use 60bar high-pressure air to inject the NaCl injected into the container into the roll-type reverse osmosis membrane device. The NaCl concentration used was 300 g / L. The tracer outlet concentration value corresponding to every 0.1 second is collected at...

Embodiment 2

[0025] In this example, a diagnostic test is performed on an old 8-inch-diameter SWC1 roll-type reverse osmosis membrane device of Hyde Energy Company.

[0026] Install the tracer NaCl solution injection container and injection valve at the inlet of the roll-type reverse osmosis membrane device, and connect it to a 60bar high-pressure air bottle; install a high-speed response conductivity meter at the outlet of the roll-type reverse osmosis membrane device and connect it to the computer.

[0027] Adjust the inlet water pressure and the inlet water flow rate of the membrane device to stabilize to the set value. When performing the residence time distribution test, the pulse mode is used. Open the valve for 1 second, and use 60bar high-pressure air to inject the NaCl injected into the container into the roll-type reverse osmosis membrane device. The NaCl concentration used was 300 g / L. The tracer outlet concentration value corresponding to every 0.1 second is collected at the ...

Embodiment 3

[0033] In this example, a diagnostic test is performed on a new 2.5-inch TW30-2514 roll-type reverse osmosis membrane device from Dow Company.

[0034] Install the tracer NaCl solution injection container and injection valve at the inlet of the roll-type reverse osmosis membrane device, and connect it to a 60bar high-pressure air bottle; install a high-speed response conductivity meter at the outlet of the roll-type reverse osmosis membrane device and connect it to the computer.

[0035] When performing the residence time distribution test, the pulse mode is used. Open the valve for 1 second, and use 60bar high-pressure air to inject the NaCl injected into the container into the roll-type reverse osmosis membrane device. The NaCl concentration used was 20 g / L. The tracer outlet concentration value corresponding to every 0.1 second is collected at the outlet of the membrane device, and the residence time distribution test is carried out.

[0036] Adjust the inlet water pressu...

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Abstract

An on-line diagnosis method for defects of a roll-type reverse osmosis membrane device adopts a residence time distribution method to diagnose fluid defects of a roll-type reverse osmosis membrane device. Using NaCl as a tracer, inject it into the inlet of the roll-type reverse osmosis membrane device to be tested during operation through high-voltage pulse injection technology, and then use a conductivity meter to detect the change curve of NaCl concentration over time at the outlet of the membrane device. The numerical transformation of the curve can obtain the characteristic parameter D / uL of the membrane defect, so as to obtain the information of the membrane defect. The diagnosis procedure adopted by the invention is simple and convenient, and the equipment cost is low, and the degree of deviation between the flow pattern in the roll-type reverse osmosis membrane device and the ideal plug flow can be diagnosed quickly, so as to determine the fluid flow defect and provide a basis for optimizing the design of the membrane device.

Description

technical field [0001] The invention relates to an online diagnosis method for defects of a roll-type reverse osmosis membrane device, which uses a residence time distribution technology to diagnose fluid flow defects in the membrane device, detect fouling conditions, and improve the overall operating performance of the roll-type reverse osmosis membrane device. Membrane design provides a basis. The invention belongs to the technical field of membrane separation in chemical engineering science. Background technique [0002] Reverse osmosis (RO) water treatment technology has outstanding advantages such as operation at room temperature, low energy consumption, compact equipment structure, and economical operating costs. It has become the most economical seawater and brackish water desalination technology, and is widely used in ultrapure water Preparation, desalination and purification of high-pressure boiler water in power plants, industrial wastewater treatment, food and be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/12B01D65/10
Inventor 杨庆峰
Owner SHANGHAI JIAO TONG UNIV
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