Reverse-flow-free nanofiltration apparatus or reverse osmosis apparatus and shutdown method thereof

A reverse osmosis device and reverse flow technology, applied in reverse osmosis, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., can solve the problem of reducing the service life of nanofiltration devices or reverse osmosis devices, nanofiltration membranes/reverse Problems such as physical damage to the permeable membrane, wrinkling and damage on the surface of the NF/RO membrane, to achieve the effect of ensuring the desalination performance and system stability, eliminating the damage to the membrane by chemical substances, and increasing the effective desalination life

Active Publication Date: 2016-04-27
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We found that in actual projects, if the high-salt nanofiltration device or reverse osmosis device is shut down in the traditional way, the high-pressure pump suddenly stops working, because the main driving pressure of the inner membrane of the permeation tube disappears, and the high-concentration on the concentrated water side Na 2 SO 4 Or high TDS will generate high osmotic pressure, which will cause the permeate water of the membrane to flow back to the concentrated water side, which will cause wrinkling damage on the surface of the NF / RO membrane, and cause large irreparable damage to the nanofiltration membrane / reverse osmosis membrane. Physical damage, which seriously affects the desalination performance of the membrane and system stability, and reduces the service life of the nanofiltration device or reverse osmosis device

Method used

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  • Reverse-flow-free nanofiltration apparatus or reverse osmosis apparatus and shutdown method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A kind of non-reverse flow nanofiltration device or reverse osmosis device according to the present invention includes a regulating tank 1 and a filter membrane unit connected thereto. There are three filter membrane units, which are respectively the first filter membrane unit 2 and the second filter membrane unit. Membrane filter unit 3 and the third membrane filter unit 4, each filter membrane unit is provided with a water inlet and two water outlets, one of which is the concentrated water outlet, and the other is the product water outlet, each filter membrane unit The concentrated water outlets are all connected to the water inlet of the next membrane filter unit, and the water outlets of the first membrane unit 2, the second membrane unit 3 and the third membrane unit 4 are connected in series to each other and then connected to the water tank 5; The water production tank 5 is also provided with two drains, one of which is connected to the water inlet of the first me...

Embodiment 2

[0027]This embodiment is basically the same as Embodiment 1, except that this embodiment adds a drain port on the concentrated water tank 6, which is connected to the water inlet of the first filter membrane unit 2, and the drain port is also The regulating valve FV01 is provided in turn, and the regulating valve FV01 is linked with the flowmeter F4. During the shutdown operation, the flow rate of the concentrated water outlet in the first membrane unit 2 can be effectively controlled by regulating the flowmeter F4 and the regulating valve. Further The amount of water in the first membrane unit 2 is controlled, which not only reduces the supply of water at the water inlet of the first membrane unit 2, but also further reduces and avoids damage to the inner membrane in the membrane unit.

Embodiment 3

[0029] This embodiment is basically the same as Embodiment 1 or 2, except that the method for controlling the shutdown of the nanofiltration device or reverse osmosis device described in this embodiment includes the following shutdown steps: (1) Start the flushing water pump M08, and close the water inlet valve XV15, after the water in the production water tank 5 is suppressed to 0.5MP on the pipeline, the constant pressure return valve DYV02 is opened; (2) Open the water inlet valve XV15, close the nanofiltration water inlet valve XV03, connect the high pressure pump M05 with the flowmeter F2 linkage control, high pressure pump M05 controls the flow meter F2 at 54m 3 / h; interlocking control between regulating valve F01V and flowmeter F4, flowmeter F4 is controlled at 42m 3 / h, the whole process is delayed for 60s; (3) The high-pressure pump M05 is adjusted by frequency conversion, and the chain control of the flowmeter F2 is transferred to the constant pressure control with ...

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Abstract

The present invention discloses a reverse-flow-free nanofiltration apparatus or a reverse-flow-free reverse osmosis apparatus, and in particular relates to a shutdown reverse-flow-free nanofiltration apparatus or a shutdown reverse-flow-free reverse osmosis apparatus. The shutdown reverse-flow-free nanofiltration apparatus or the shutdown reverse-flow-free reverse osmosis apparatus includes an adjusting tank and a filter film unit which is connected with the adjusting tank, the filter film unit is provided with a water inlet and two water outlets, the two water outlets are respectively connected with a production water tank and a concentration water tank, the concentration water tank and the production water tank are respectively provided with water discharge ports, the production water tank is provided with two water discharge ports, and one of the water discharge ports is connected with the water inlet of the filter film unit. When in shutdown work, water in the production water tank is led into the water inlet of the filter film unit by a pipe to replace water in the adjusting tank for sustained input, the phenomenon of reverse flow, which is caused by internal high osmotic pressure due to sudden shutdown of a high-pressure pump, of production water of a film to a concentration water side can be effectively avoided, filtrationfilm surface wrinkling and damage can be avoided, filtrationfilm desalination performance and system stability can be ensured, and the service life of the reverse-flow-free nanofiltration apparatus or the reverse-flow-free reverse osmosis apparatus can be prolonged.

Description

technical field [0001] The invention relates to a water purification device, in particular to a nanofiltration device or a reverse osmosis device without reverse flow when shut down. [0002] The invention relates to a shutdown method of a non-reverse flow nanofiltration device or a reverse osmosis device. Background technique [0003] In wastewater zero discharge projects, nanofiltration or RO is usually installed in the front of the evaporation crystallizer to re-concentrate the wastewater. The salt content of wastewater entering nanofiltration or RO is relatively high, reaching 40,000-50,000mg / L. We found that in actual projects, if the high-salt nanofiltration device or reverse osmosis device is shut down in the traditional way, the high-pressure pump suddenly stops working, because the main driving pressure of the inner membrane of the permeation tube disappears, and the high-concentration on the concentrated water side Na 2 SO 4 Or high TDS will generate high osmoti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D61/00B01D61/10
CPCY02A20/131Y02A20/144C02F1/442B01D61/025B01D61/027B01D61/10B01D2311/16C02F1/441C02F2209/40
Inventor 王林王淑莉
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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