CN112892216A - Device and method for preventing reverse osmosis membrane back pressure from being damaged - Google Patents
Device and method for preventing reverse osmosis membrane back pressure from being damaged Download PDFInfo
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- CN112892216A CN112892216A CN202110348304.7A CN202110348304A CN112892216A CN 112892216 A CN112892216 A CN 112892216A CN 202110348304 A CN202110348304 A CN 202110348304A CN 112892216 A CN112892216 A CN 112892216A
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- reverse osmosis
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- fresh water
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- 239000012528 membrane Substances 0.000 title claims abstract description 179
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000013505 freshwater Substances 0.000 claims abstract description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 230000006378 damage Effects 0.000 claims abstract description 18
- 230000008676 import Effects 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 231100000989 no adverse effect Toxicity 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 description 3
- 230000002427 irreversible effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/08—Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/10—Accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/12—Controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a device for preventing reverse osmosis membrane back pressure from being damaged, which comprises a high-pressure pump, a first section of reverse osmosis membrane, a second section of reverse osmosis membrane, a stop valve, a concentrated water tank, a fresh water tank, a membrane fresh water outlet discharge valve and a pressure transmitter, wherein the high-pressure pump is connected with the first section of reverse osmosis membrane; the high pressure pump export is connected to one section reverse osmosis membrane import, and one section reverse osmosis membrane links to each other with second section reverse osmosis membrane, and the dense water exit linkage of second section reverse osmosis membrane is to dense water tank, is equipped with the stop valve between second section reverse osmosis membrane and the dense water tank, and one section reverse osmosis membrane fresh water export and second section reverse osmosis membrane fresh water exit linkage are to fresh water tank. The invention has the beneficial effects that: the pressure transmitter is arranged at the membrane fresh water outlet, and the pressure relief is completed by controlling the opening and closing of the membrane fresh water outlet discharge valve through the backpressure value of the reverse osmosis membrane, so that the damage of the reverse osmosis membrane caused by the backpressure can be avoided; the device for preventing the reverse osmosis membrane from being damaged by the back pressure has low cost, simple method, almost no adverse effect and strong applicability, and can be used for various reverse osmosis membrane systems.
Description
Technical Field
The invention belongs to the technical field of environment-friendly water treatment, and particularly relates to a device and a method for preventing reverse osmosis membrane back pressure from being damaged.
Background
The reverse osmosis system is widely applied to the water treatment industry, is used for removing most of salt-containing substances in water treatment, and has the advantages of environmental protection, economy, simple and convenient system and low consumption of chemical agents, so the reverse osmosis system is in a large-scale application trend in recent years. However, reverse osmosis membranes also have many problems in use, such as oxidation, fouling and back pressure damage, wherein the damage of oxidation and back pressure damage is the most and irreversible, and the back pressure of reverse osmosis membranes can cause the stripping damage of membrane desalination layers and is irreversible and very harmful.
In general reverse osmosis membrane systems, under the daily operation condition, the outlet pressure of a reverse osmosis membrane is fixed, only one membrane outlet is in static pressure to a water tank, and the inlet pressure of the membrane is very high in operation, generally about 1MPa, so that back pressure cannot exist. A check valve is arranged on a pipeline from the membrane outlet to the water tank, water is prevented from flowing back to the membrane system from the water tank, the check valve is generally arranged at the membrane outlet, when the reverse osmosis membrane is stopped, the inlet pressure disappears, the discharge valve of the fresh water outlet is also opened, the pressures at the two sides are all discharged, and the back pressure is 0. Therefore, the membrane fresh water outlet side is not provided with a pressure transmitter, which is safer in daily operation and shutdown and does not have the back pressure condition.
However, reverse osmosis membranes may also have back pressure conditions in some cases:
1. when the membrane system stops running, the outlet check valve is damaged and is not normally closed, the water tank backwater pressure is transmitted to the membrane outlet, and the backpressure is established with the membrane inlet pressure, and the numerical value of the backpressure is the maximum height pressure of the inlet pipe of the water tank at the moment.
2. When the membrane is in the chemical cleaning process, the pipeline to the water tank is closed, the pipeline to the cleaning system is opened, when the two-section membrane is cleaned independently, cleaning liquid enters from the inlet of the two-section membrane, the pressure of the inlet of the one-section membrane is almost 0, and the outlet has certain pressure at this time, so that certain back pressure exists.
When the reverse osmosis membrane is subjected to a large back pressure for some reason, irreversible membrane damage may occur.
Therefore, there is a need to develop a new device and method for preventing reverse osmosis membrane from back pressure damage, which can avoid back pressure damage and ensure long-term reliable operation of reverse osmosis system.
Disclosure of Invention
The invention aims to provide a device and a method for preventing reverse osmosis membrane back pressure damage, aiming at solving the problem that the prior reverse osmosis membrane system is easy to generate back pressure damage.
The device for preventing the reverse osmosis membrane from being damaged by back pressure comprises a high-pressure pump, a first section of reverse osmosis membrane, a second section of reverse osmosis membrane, a stop valve, a concentrated water tank, a fresh water tank, a membrane fresh water outlet discharge valve and a pressure transmitter; the high-pressure pump is exported and is connected to one section reverse osmosis membrane import, and one section reverse osmosis membrane links to each other with second section reverse osmosis membrane, and the dense water outlet of second section reverse osmosis membrane is connected to dense water tank, is equipped with the stop valve between second section reverse osmosis membrane and the dense water tank, and one section reverse osmosis membrane fresh water export and second section reverse osmosis membrane fresh water export are connected to fresh water tank, and one section reverse osmosis membrane fresh water export and second section reverse osmosis membrane fresh water export are equipped with membrane fresh water export discharge valve respectively, are equipped with the stop valve on the way of one.
Preferably, the method comprises the following steps: and a pressure transmitter is arranged on a main path of the fresh water outlet of the first reverse osmosis membrane and the second reverse osmosis membrane.
Preferably, the method comprises the following steps: and the branches of the fresh water outlet of the first reverse osmosis membrane and the second reverse osmosis membrane are respectively provided with a pressure transmitter.
Preferably, the method comprises the following steps: a pressure gauge PI and a pressure transmitter PT are arranged at the inlet of the reverse osmosis membrane at one section.
Preferably, the method comprises the following steps: and a pressure gauge PI is arranged between the first section of reverse osmosis membrane and the second section of reverse osmosis membrane.
Preferably, the method comprises the following steps: and a pressure gauge PI is arranged at the concentrated water outlet of the second-stage reverse osmosis membrane.
The control method of the device for preventing the reverse osmosis membrane from being damaged comprises the steps of setting a section of membrane back pressure A as membrane fresh water outlet pressure-a section of membrane inlet pressure, displaying that the back pressure value is too high when the A value is more than 0.03MPa, opening a membrane fresh water outlet discharge valve, and discharging the outlet pressure to 0; and setting a two-stage membrane back pressure B which is the membrane fresh water outlet pressure-the two-stage membrane inlet pressure, when the B value is more than 0.03MPa, displaying that the back pressure value is too high, opening a membrane fresh water outlet discharge valve, and discharging the outlet pressure to 0.
The invention has the beneficial effects that:
1. the pressure transmitter is arranged at the membrane fresh water outlet, and the pressure relief is completed by controlling the opening and closing of the membrane fresh water outlet discharge valve through the backpressure value of the reverse osmosis membrane, so that the damage of the reverse osmosis membrane caused by the backpressure can be avoided.
2. The device for preventing the reverse osmosis membrane from being damaged by the back pressure has the advantages of low cost, simple method, almost no adverse effect and strong applicability, and can be used for various reverse osmosis membrane systems.
Drawings
FIG. 1 is a schematic view of an apparatus for preventing back pressure destruction of a reverse osmosis membrane.
Description of reference numerals: the device comprises a high-pressure pump 1, a first section reverse osmosis membrane 2, a second section reverse osmosis membrane 3, a stop valve 4, a concentrated water tank 5, a fresh water tank 6 and a membrane fresh water outlet discharge valve 7.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Example one
The embodiment provides a device for preventing reverse osmosis membrane back pressure from destroying, increases pressure transmitter at membrane fresh water outlet side to calculate and monitor reverse osmosis membrane back pressure value, the former system of one section membrane inlet pressure and two sections membrane inlet pressure has been equipped with, no longer increases pressure transmitter. The device structurally comprises a high-pressure pump 1, a first section reverse osmosis membrane 2, a second section reverse osmosis membrane 3, a stop valve 4, a concentrated water tank 5, a fresh water tank 6, a membrane fresh water outlet discharge valve 7 and a pressure transmitter; 1 exit linkage of high-pressure pump is to one section reverse osmosis membrane 2 import, one section reverse osmosis membrane 2 links to each other with two sections reverse osmosis membrane 3, 3 dense water exports of two sections reverse osmosis membrane are connected to dense water tank 5, be equipped with stop valve 4 between two sections reverse osmosis membrane 3 and the dense water tank 5, 2 fresh water exports of one section reverse osmosis membrane and 3 fresh water exports of two sections reverse osmosis membrane are connected to fresh water tank, 2 fresh water exports of one section reverse osmosis membrane and 3 fresh water exports of two sections reverse osmosis membrane are equipped with membrane fresh water outlet discharge valve 7 respectively, be equipped with stop valve 4 on the way of 2 fresh water export.
As a preferred embodiment, a pressure transmitter is arranged on a main path of the fresh water outlet of the first reverse osmosis membrane 2 and the second reverse osmosis membrane 3. As an alternative embodiment, a pressure transmitter is respectively arranged on the branches of the fresh water outlet of the first reverse osmosis membrane 2 and the second reverse osmosis membrane 3.
As a preferred embodiment, a pressure gauge PI and a pressure transmitter PT are arranged at the inlet of the reverse osmosis membrane 2.
As a preferred embodiment, a pressure gauge PI is arranged between the first section of reverse osmosis membrane 2 and the second section of reverse osmosis membrane 3.
As a preferred embodiment, a pressure gauge PI is arranged at a concentrated water outlet of the two-stage reverse osmosis membrane 3.
Example two
The present embodiment provides a control method of an apparatus for preventing reverse osmosis membrane back pressure from being damaged, in which the following logic is added to a membrane control program:
1. setting a first-stage membrane back pressure A as membrane fresh water outlet pressure-a first-stage membrane inlet pressure in unit of MPa
The back pressure value of the common reverse osmosis membrane is safe when being less than 0.03MPa and is unsafe when being more than 0.03MPa according to field tests.
When the A value is more than 0.03MPa, the back pressure value is too high, and the membrane fresh water outlet discharge valve is opened to discharge the outlet pressure to 0.
2. Setting two-stage membrane back pressure B as membrane fresh water outlet pressure-two-stage membrane inlet pressure, unit MPa
When the B value is more than 0.03MPa, the back pressure value is too high, and the membrane fresh water outlet discharge valve is opened to discharge the outlet pressure to 0.
By adopting the control method of the device for preventing the reverse osmosis membrane from being damaged by the back pressure, the back pressure values of all sections of the reverse osmosis membrane can be monitored at any time, and the discharge valve of the membrane fresh water outlet is opened in an interlocking manner, so that the phenomenon of back pressure damage can not be generated any more.
EXAMPLE III
The reverse osmosis system of a certain coal-fired power plant is rated for 100 tons/hour and consists of a high-pressure pump, a first section of reverse osmosis membrane, a second section of reverse osmosis membrane, an outlet pipeline, an outlet discharge valve, a product water tank, corresponding pipelines and valves. The membrane pressure monitoring points arranged in the original system are 3, namely a first-section membrane inlet, a second-section membrane inlet and a second-section membrane concentrated water outlet, the membrane fresh water outlet is free of a pressure transmitter, the back pressure phenomenon frequently occurs due to the failure of an outlet check valve in operation, the membrane damage phenomenon frequently occurs, and the operation of the water treatment equipment is seriously threatened. As shown in figure 1, the device of this patent is installed, can only increase a pressure transmitter on membrane fresh water export main road, increases backpressure monitoring data on reverse osmosis membrane system control picture, increases logical judgement signal, when the backpressure is greater than 0.03MPa, opens membrane fresh water export discharge valve pressure release immediately, can not produce the backpressure, uses the device after, the membrane backpressure destruction phenomenon no longer takes place.
After the device is normally put into operation, the reverse osmosis membrane has qualified water quality during operation and operates normally. The above results indicate that the device and the method for preventing the reverse osmosis membrane from back pressure damage have good performance of preventing back pressure damage.
Claims (7)
1. The utility model provides a prevent device that reverse osmosis membrane backpressure destroyed which characterized in that: comprises a high-pressure pump (1), a first section reverse osmosis membrane (2), a second section reverse osmosis membrane (3), a stop valve (4), a concentrated water tank (5), a fresh water tank (6), a membrane fresh water outlet discharge valve (7) and a pressure transmitter; high-pressure pump (1) exit linkage to one section reverse osmosis membrane (2) import, one section reverse osmosis membrane (2) link to each other with two section reverse osmosis membrane (3), two section reverse osmosis membrane (3) dense water exit linkage to dense water tank (5), be equipped with between two section reverse osmosis membrane (3) and dense water tank (5) stop valve (4), one section reverse osmosis membrane (2) fresh water export and two section reverse osmosis membrane (3) fresh water exit linkage to fresh water tank, one section reverse osmosis membrane (2) fresh water export and two section reverse osmosis membrane (3) fresh water export are equipped with membrane fresh water export discharge valve (7) respectively, be equipped with stop valve (4) on the way of one section reverse osmosis membrane (2) fresh water export and two section reverse osmosis membrane (3) fresh.
2. The apparatus of claim 1 for preventing back pressure disruption in a reverse osmosis membrane, wherein: a pressure transmitter is arranged on a main path of the fresh water outlet of the first section of reverse osmosis membrane (2) and the second section of reverse osmosis membrane (3).
3. The apparatus of claim 1 for preventing back pressure disruption in a reverse osmosis membrane, wherein: and the branches of the fresh water outlets of the first section of reverse osmosis membrane (2) and the second section of reverse osmosis membrane (3) are respectively provided with a pressure transmitter.
4. The apparatus of claim 1 for preventing back pressure disruption in a reverse osmosis membrane, wherein: a pressure gauge PI and a pressure transmitter PT are arranged at the inlet of the first section of reverse osmosis membrane (2).
5. The apparatus of claim 1 for preventing back pressure disruption in a reverse osmosis membrane, wherein: a pressure gauge PI is arranged between the first section reverse osmosis membrane (2) and the second section reverse osmosis membrane (3).
6. The apparatus of claim 1 for preventing back pressure disruption in a reverse osmosis membrane, wherein: a pressure gauge PI is arranged at the concentrated water outlet of the second-stage reverse osmosis membrane (3).
7. A control method of the reverse osmosis membrane back pressure destruction preventing apparatus according to claim 1, characterized in that: setting a section of membrane back pressure A as membrane fresh water outlet pressure-a section of membrane inlet pressure, when the A value is more than 0.03MPa, displaying that the back pressure value is too high, opening a membrane fresh water outlet discharge valve, and discharging the outlet pressure to 0; and setting a two-stage membrane back pressure B which is the membrane fresh water outlet pressure-the two-stage membrane inlet pressure, when the B value is more than 0.03MPa, displaying that the back pressure value is too high, opening a membrane fresh water outlet discharge valve, and discharging the outlet pressure to 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110348304.7A CN112892216A (en) | 2021-03-31 | 2021-03-31 | Device and method for preventing reverse osmosis membrane back pressure from being damaged |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110348304.7A CN112892216A (en) | 2021-03-31 | 2021-03-31 | Device and method for preventing reverse osmosis membrane back pressure from being damaged |
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| CN112892216A true CN112892216A (en) | 2021-06-04 |
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| CN202110348304.7A Pending CN112892216A (en) | 2021-03-31 | 2021-03-31 | Device and method for preventing reverse osmosis membrane back pressure from being damaged |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203370465U (en) * | 2013-05-31 | 2014-01-01 | 天津开发区天元康宇环保科技发展有限公司 | Backpressure prevention device of reverse osmosis system |
| CN206064167U (en) * | 2016-08-30 | 2017-04-05 | 南京中电环保工程有限公司 | A kind of counter-infiltration system overpressure protection apparatus |
| CN206886751U (en) * | 2017-05-23 | 2018-01-16 | 西安聚方环境科技有限公司 | A kind of high-recovery energy-saving reverse osmosis system for Desultwater Station |
| CN107638811A (en) * | 2017-10-20 | 2018-01-30 | 陕西省石油化工研究设计院 | A kind of reverse osmosis unit rinses closing method without reverse flow |
| CN214552566U (en) * | 2021-03-31 | 2021-11-02 | 浙江浙能技术研究院有限公司 | Device for preventing reverse osmosis membrane back pressure from being damaged |
-
2021
- 2021-03-31 CN CN202110348304.7A patent/CN112892216A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203370465U (en) * | 2013-05-31 | 2014-01-01 | 天津开发区天元康宇环保科技发展有限公司 | Backpressure prevention device of reverse osmosis system |
| CN206064167U (en) * | 2016-08-30 | 2017-04-05 | 南京中电环保工程有限公司 | A kind of counter-infiltration system overpressure protection apparatus |
| CN206886751U (en) * | 2017-05-23 | 2018-01-16 | 西安聚方环境科技有限公司 | A kind of high-recovery energy-saving reverse osmosis system for Desultwater Station |
| CN107638811A (en) * | 2017-10-20 | 2018-01-30 | 陕西省石油化工研究设计院 | A kind of reverse osmosis unit rinses closing method without reverse flow |
| CN214552566U (en) * | 2021-03-31 | 2021-11-02 | 浙江浙能技术研究院有限公司 | Device for preventing reverse osmosis membrane back pressure from being damaged |
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