CN111617637B - Rolling method of roll type membrane element - Google Patents
Rolling method of roll type membrane element Download PDFInfo
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- CN111617637B CN111617637B CN202010524364.5A CN202010524364A CN111617637B CN 111617637 B CN111617637 B CN 111617637B CN 202010524364 A CN202010524364 A CN 202010524364A CN 111617637 B CN111617637 B CN 111617637B
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- film roll
- winding
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- carbon fiber
- membrane element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/10—Spiral-wound membrane modules
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a rolling method of a roll type membrane element, which comprises the following steps: 1) folding the membrane in half to form an n shape, and placing a concentrated water separation net in the middle of the n shape; 2) placing a light net on the folded diaphragm, and then coating glue on three sides of the diaphragm with openings; 3) winding the diaphragm after the step 2) on a central water production pipe to form a diaphragm roll; 4) winding the carbon fiber cloth into a film roll; 5) soaking the mixed fiber yarn wound by the carbon fiber yarn and the glass fiber in resin sealant: 6) and winding the soaked mixed fiber yarns on a film roll to finish the rolling of the roll type film element. The roll-type membrane element prepared by the method has high strength and anti-explosion capability, and is suitable for seawater desalination and treatment of various industrial wastewater with high salt content.
Description
Technical Field
The invention belongs to the technical field of membrane separation, and particularly relates to a rolling method of a spiral membrane element.
Background
The situation of water resources in China is very severe, fresh water resources are in short and distributed unevenly, and water quality in various regions is uneven. The population of the area north of the Yangtze river accounts for 46 percent of the total population, but the water resource accounts for 19 percent of the whole country; the water quality in the north and the west is too hard, and the water pollution problem in the east is very serious.
The open source throttling is two major approaches for solving the problem of water resources, and in the aspect of open source, seawater desalination is taken as an open source increment technology of seawater resources, so that the open source throttling is an important approach for solving the global water resource crisis; in the aspect of throttling, the industry is a large water consumer, and with the tightening of policies, the emission standard of China for industrial wastewater is higher and higher, and enterprises are required to adopt a water-saving strategy to realize the total reuse of the industrial wastewater as much as possible, so that the near-zero emission of the industrial wastewater is a popular technology researched at present.
The seawater desalination and near zero discharge technology can not be provided with high-pressure nanofiltration and high-pressure reverse osmosis membrane elements, the TDS of seawater desalination raw water inlet water is about 3-4 ten thousand ppm, the TDS of near zero discharge concentrated wastewater is even as high as 10-12 ten thousand ppm, high TDS needs high pressure to be driven, and part of high-salinity wastewater treatment systems reach 120 kilograms (12 MPa).
At present, the traditional enhancement layer of the spiral wound membrane element is generally composed of glass fiber and an adhesive, the membrane element rolled by the method can only bear about 80 kilograms of operating pressure, and when the operating pressure is further increased, the glass fiber reinforced plastic enhancement layer has the risk of 'wire explosion', so that the service life of the membrane element is greatly shortened.
Disclosure of Invention
The invention aims to solve the problems and provide a rolling method which can enable a rolled membrane element to have high strength and bursting resistance.
In order to achieve the purpose, the invention provides a rolling method of a roll type membrane element, which comprises the following steps:
step one, manufacturing a diaphragm; placing the edge of the membrane without the opening on the central water production pipe, and winding the membrane on the central water production pipe to form a membrane roll;
step two, winding the carbon fiber cloth from the center of the film roll, firstly winding the carbon fiber cloth to one end of the film roll, then winding the carbon fiber cloth to the other end of the film roll, finally winding the carbon fiber cloth back to the center of the film roll, and fixing the tail of the carbon fiber cloth on the film roll to form an inner enhancement layer;
and step three, placing the soaked mixed fiber yarns at one end of a membrane roll, and winding the mixed fiber yarns on the membrane roll to form an outer enhancement layer to obtain the roll-type membrane element.
Preferably, the manufacturing of the membrane in the first step specifically comprises: folding a piece of membrane in half along the length direction to form an n shape, and placing a concentrated water separation net in the middle of the n shape; placing a fresh water separation net on the folded diaphragm and coating resin sealing glue on the three connecting edges with openings; the membrane is spirally wound onto a central water-producing tube to form a roll.
As a further scheme of the invention: the membrane is wound onto the central water production tube in a spiral manner.
As a further scheme of the invention: the width of the carbon fiber cloth is set to be 5cm-10 cm.
As a further scheme of the invention: in the second step, the carbon fiber cloth is wound from the center of the film roll by 5-40 degrees, and the angle of the start of winding is preferably 10-25 degrees.
As a further scheme of the invention: the mixed fiber yarn comprises carbon fiber yarn and glass fiber yarn, and the carbon fiber yarn and the glass fiber yarn are bonded through resin sealant;
preferably, the ratio of the carbon fiber yarns to the glass fiber yarns is set to be (6-9) to (4-1).
As a further scheme of the invention: the winding method of the mixed fiber yarn on the film roll comprises the following steps: firstly, the film is wound in a hoop direction after being crossly wound at an angle of 5-40 degrees from one end of the film roll.
As a further scheme of the invention: the resin sealant is epoxy resin or polyurethane resin.
As a further scheme of the invention: the roll-type membrane element is one of a reverse osmosis roll-type membrane element, a nanofiltration roll-type membrane element, a forward osmosis roll-type membrane element and an ultrafiltration roll-type membrane element.
The technical scheme of the invention has the following beneficial effects:
(1) the roll-type membrane element prepared by the rolling method provided by the invention has very high strength and anti-explosion capability, and is suitable for seawater desalination and treatment of various industrial wastewater with high salt content.
(2) According to the invention, the carbon fiber layer is composed of the carbon fiber yarns and the glass fiber yarns, and the glass fiber yarns are added, so that the cost is reduced, the impregnation property of the glass fiber is superior to that of the carbon fiber, and the impregnation property of the resin glue solution can be improved by adding the glass fiber.
(3) According to the invention, the proportion of the carbon fiber yarns and the glass fiber yarns is set to be 60-90% so as to enhance the strength of the membrane element, so that the membrane element has the advantages of enhancing the strength by 40-60% and enhancing the modulus by 100-130% compared with a pure glass fiber reinforced enhancement layer.
(4) According to the invention, the resin sealant is epoxy resin or polyurethane resin, so that the permeability of the carbon fiber layer is effectively ensured.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below.
Detailed Description
The invention is described in detail in the following specific examples, but can be implemented in many different ways as defined and covered by the claims.
The invention provides a rolling method of a roll type membrane element, which comprises the following steps:
the method comprises the following steps: folding a piece of membrane in half along the length direction to form an n shape, and placing a thick water separation net in the middle of the n shape;
step two: placing a fresh water separation net on the folded diaphragm, and gluing three non-connecting edges;
step three: placing the edge without the opening of the membrane sheet in the second step on the central water production pipe, and winding the edge on the central water production pipe in a spiral mode to form a membrane roll;
step four: after the glue is dried, trimming the two ends of the film roll, and welding the end covers on the two ends of the central water production pipe by a hot melting technology to finish the manufacture of the roll film roll
Step five: winding carbon fiber cloth with the width of 5cm-10cm onto a film roll to form an inner enhancement layer, so as to fix the shape of the film roll;
step six: placing fiber yarns containing carbon fiber yarns and glass fiber yarns into epoxy resin glue or polyurethane resin glue for soaking;
step seven: and placing the soaked carbon fiber layer at one end of the membrane roll, starting the winding equipment, and winding the carbon fiber layer on the membrane roll to finish the winding of the roll-type membrane element.
As a further embodiment of the invention: the winding method of the inner enhancement layer in the fourth step is specifically as follows: the winding is carried out at the speed of 100-150 rpm and the moving speed of 4-8cm/s, and 1-3 layers are wound.
As a further embodiment of the invention: the winding of the inner enhancement layer in the fourth step comprises the following specific steps:
A. winding at an angle of 5-40 degrees from the center of the film roll;
B. winding from the center of the film roll to one end of the film roll;
C. then winding to the center of the film roll;
D. then winding to the other end of the film roll;
E. winding to the center of the film roll again, and fixing the tail part of the inner enhancement layer;
F. and finishing the winding of the inner enhancement layer.
As a further embodiment of the invention: the carbon fiber layer in the fifth step comprises carbon fiber yarns and glass fiber yarns, and the carbon fiber yarns and the glass fiber yarns are bonded through resin sealant;
preferably, the ratio of the carbon fiber yarns to the glass fiber yarns is set to be (6-9) to (4-1).
Preferably, the carbon fiber layer is wound by the following specific steps:
A. winding from one end of the film roll to the center of the film roll;
B. winding the film roll from the center of the film roll to the other end of the film roll;
C. then winding to the center of the film roll;
D. then winding to one end of the film roll;
E. repeating the steps B-D to perform back and forth cross winding and 6-8 layers of parallel winding, wherein the cross winding speed is 100-150 rpm and the moving speed is 20-40 cm/s;
F. winding the film roll from one end of the film roll to the center of the film roll;
G. winding the film roll from the center of the film roll to the other end of the film roll;
H. then winding the film back to the center of the film roll;
I. then winding to one end of the film roll;
J. repeating the step F-I to perform annular winding and wind the coil for 2 layers, wherein the annular winding speed is 100-150 revolutions per minute, and the moving speed is 1-4 cm/s;
K. and finishing the rolling of the roll type membrane element.
As a further embodiment of the invention: and after the roll-type membrane element is rolled, the resin sealant is dried, and then the roll-type membrane element can be packaged.
Comparative example 1
A rolling method of a roll-type membrane element comprises the following specific implementation steps:
the method comprises the following steps: folding a piece of membrane in half along the length direction to form an n shape, and placing a thick water separation net in the middle of the n shape;
step two: placing the folded diaphragm on three connecting edges of a fresh water separation net for gluing;
step three: placing the edge without the opening of the membrane sheet in the second step on the central water production pipe, and winding the edge on the central water production pipe in a spiral mode to form a membrane roll;
step four: after the glue is dried, trimming the two ends of the film roll, and welding the end covers on the two ends of the central water production pipe by a hot melting technology to finish the manufacture of the roll type film roll;
step five: winding 2 layers of glass fiber cloth with the width of 8cm on a film roll at an angle of 15 degrees, wherein the rotating speed of a winding machine is 120 revolutions per minute, the moving speed is 6cm per second, winding 2 layers of glass fiber cloth on the film roll to form an inner enhancement layer, and realizing the fixation of the shape of the film roll;
step six: placing the glass fiber yarn in epoxy resin glue for soaking;
step seven: placing the soaked glass fiber yarn layer at one end of a film roll, starting a winding device, and winding 6 layers by adopting a cross winding mode, wherein the cross winding speed is 120 revolutions per minute, and the moving speed is 25cm per second; then winding 2 layers by adopting a hoop winding mode, wherein the hoop winding speed is 120 revolutions per minute, the moving speed is 2cm per second, and winding the glass fiber layer on a film roll to finish the rolling of the roll type film element;
step eight: after the epoxy resin is dried, an outer reinforcement layer ring with the width of 5cm is taken by adopting a ring cutting mode, and a ring compression destructive power test is carried out (the test data is shown in a table 1).
Example one
The invention provides a rolling method of a roll type membrane element, which comprises the following specific implementation steps:
the method comprises the following steps: folding a piece of membrane in half along the length direction to form an n shape, and placing a concentrated water separation net in the middle of the n shape;
step two: placing the folded diaphragm on three connecting edges of a fresh water separation net for gluing;
step three: placing the edge of the diaphragm which is not provided with the opening and is subjected to the second step on the central water production pipe, and winding the edge of the diaphragm on the central water production pipe in a spiral manner to form a diaphragm roll;
step four: after the glue is dried, trimming the two ends of the film roll, and welding the end covers on the two ends of the central water production pipe by a hot melting technology to finish the manufacture of the roll film roll
Step five: winding 2 layers of carbon fiber cloth with the width of 8cm on a film roll at an angle of 15 degrees, wherein the rotating speed of a winding machine is 120 revolutions per minute, the moving speed is 6cm per second, winding 2 layers of carbon fiber cloth on the film roll to form an inner enhancement layer, and realizing the fixation of the shape of the film roll;
step six: placing fiber yarns containing carbon fiber yarns and glass fiber yarns into an epoxy resin adhesive for soaking; wherein the ratio of the carbon fiber yarns to the glass fiber yarns is 6: 4.
Step seven: placing the soaked fiber yarn layer at one end of a film roll, starting a winding device, and winding 6 layers by adopting a cross winding mode, wherein the cross winding speed is 120 revolutions per minute, and the moving speed is 25cm per second; then winding 2 layers by adopting a hoop winding mode, wherein the hoop winding speed is 120 revolutions per minute, the moving speed is 2cm/s, winding the glass fiber layer on a film roll, and finishing the rolling of the roll-type film element;
step eight: after the epoxy resin was dried, an outer reinforcement layer ring having a width of 5cm was taken by circular cutting to perform a circular compression failure test (test data is shown in table 1).
Example two
The invention provides a rolling method of a roll-type membrane element, which performs rolling according to the rolling steps of two pairs of membrane elements of an embodiment, and the difference lies in that: the ratio of the carbon fiber yarns to the glass fiber yarns in the sixth step is 7: 3; and
after the epoxy resin was dried, an outer reinforcing layer ring having a width of 5cm was taken by circular cutting, and subjected to a circular compression failure test (test data is shown in table 1).
EXAMPLE III
The invention provides a rolling method of a roll-type membrane element, which performs rolling according to the rolling steps of two pairs of membrane elements of an embodiment, and the difference lies in that: the proportion of the carbon fiber yarns to the glass fiber yarns in the sixth step is 8: 2; and
after the epoxy resin is dried, an outer reinforcement layer ring with the width of 5cm is taken by adopting a ring cutting mode, and a ring compression destructive force test is carried out (the test data is shown in a table 1).
Example four
The invention provides a rolling method of a roll-type membrane element, which performs rolling according to the rolling steps of two pairs of membrane elements of an embodiment, and the difference lies in that: the ratio of the carbon fiber yarns to the glass fiber yarns in the sixth step is 9: 1; and
after the epoxy resin was dried, an outer reinforcing layer ring having a width of 5cm was taken by circular cutting, and subjected to a circular compression failure test (test data is shown in table 1).
EXAMPLE five
The invention provides a rolling method of a roll-type membrane element, which rolls the membrane element according to two rolling steps of the membrane element, and the difference is that: the ratio of the carbon fiber yarns to the glass fiber yarns in the sixth step is 10: 0; and
after the epoxy resin is dried, an outer reinforcement layer ring with the width of 5cm is taken by adopting a ring cutting mode, and a ring compression destructive force test is carried out (the test data is shown in a table 1).
Example six
The invention provides a rolling method of a roll-type membrane element, which rolls the membrane element according to two rolling steps of the membrane element, and the difference is that: the number of layers wound in a cross winding manner in the seventh step is 8; and
after the epoxy resin is dried, an outer reinforcement layer ring with the width of 5cm is taken by adopting a ring cutting mode, and a ring compression destructive force test is carried out (the test data is shown in a table 1).
TABLE 1 pressure resistance of membrane element
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (3)
1. A rolling method of a roll-type membrane element is characterized by comprising the following steps: the method comprises the following steps:
firstly, folding a piece of membrane in half along the length direction to form an n shape, and placing a thick water separation net in the middle of the n shape; placing a fresh water separation net on the folded diaphragm, and coating resin sealant on the connecting edges of the three openings; the diaphragm is spirally wound on the central water production pipe to form a film roll, and the end covers are welded on the two ends of the central water production pipe through a hot melting technology;
winding carbon fiber cloth with the width of 5cm-10cm from the center of the film roll at an angle of 5-40 degrees, firstly winding the carbon fiber cloth from the center of the film roll to one end of the film roll, then winding the carbon fiber cloth to the center of the film roll, then winding the carbon fiber cloth to the other end, finally winding the carbon fiber cloth back to the center of the film roll, and fixing the tail part of the carbon fiber cloth on the film roll to form an inner enhancement layer;
step three, placing mixed fiber yarns formed by adhering carbon fiber yarns and glass fiber yarns in a ratio of (6-9) to (4-1) through resin sealant into the sealant for soaking, placing the soaked mixed fiber yarns at one end of a membrane roll, and winding the mixed fiber yarns on the membrane roll to form an outer enhancement layer to obtain a roll-type membrane element; the resin sealant is epoxy resin or polyurethane resin;
the specific steps of winding the mixed fiber yarn on the film roll are as follows:
winding 6-8 layers in a back-and-forth crossed manner from one end of the film roll → the center of the film roll → the other end of the film roll → the center of the film roll → one end of the film roll at a rotation speed of 100-150 rpm and a moving speed of 20-40 cm/s;
winding 2 layers of the film roll back and forth in a mode of rotating at the speed of 100-150 revolutions per minute and moving at the speed of 1-4cm/s from one end of the film roll → the center of the film roll → the other end of the film roll → the center of the film roll → one end of the film roll;
and step four, after the epoxy resin or the polyurethane resin is dried, taking the outer reinforcement layer circular ring with the width of 5cm by adopting a circular cutting mode, and carrying out annular compression destructive power test.
2. The rolling method according to claim 1, characterized in that: the winding angle of the carbon fiber cloth from the center of the film roll is set to be 10-25 degrees.
3. The rolling method according to any one of claims 1-2, characterized in that: the spiral wound membrane element is one of a reverse osmosis spiral wound membrane element, a nanofiltration spiral wound membrane element, a forward osmosis spiral wound membrane element and an ultrafiltration spiral wound membrane element.
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| CN202136922U (en) * | 2011-03-18 | 2012-02-08 | 杭州易膜环保科技有限公司 | Spiral roll type household membrane element |
| CN103899852B (en) * | 2014-04-16 | 2016-06-15 | 上海耀华玻璃钢有限公司 | Reinforced plastic glass fibre pipe making method and reinforced plastic glass fibre pipe |
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| WO1999011361A1 (en) * | 1997-08-29 | 1999-03-11 | Hydranautics | Reverse osmosis filter assembly and method of manufacture |
| CN102596376A (en) * | 2009-10-19 | 2012-07-18 | 陶氏环球技术有限责任公司 | Method of testing the integrity of spiral wound modules |
| CN101705922A (en) * | 2009-11-30 | 2010-05-12 | 株洲时代新材料科技股份有限公司 | Large-scale composite material wind-power blade and preparation method thereof |
| CN203710924U (en) * | 2013-10-31 | 2014-07-16 | 贵阳时代沃顿科技有限公司 | Rolled reverse osmosis membrane element |
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