CN104258736B - The computational methods of a kind of counter-infiltration unit are diaphragm aquifer yield and membrane component aquifer yield conversion relation - Google Patents
The computational methods of a kind of counter-infiltration unit are diaphragm aquifer yield and membrane component aquifer yield conversion relation Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 142
- 238000000205 computational method Methods 0.000 title claims abstract description 14
- 238000001764 infiltration Methods 0.000 title claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000001514 detection method Methods 0.000 claims 1
- 238000001223 reverse osmosis Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000004907 flux Effects 0.000 description 8
- 239000004744 fabric Substances 0.000 description 5
- 150000003839 salts Chemical group 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003204 osmotic effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The invention discloses the computational methods of a kind of counter-infiltration unit are diaphragm aquifer yield and membrane component aquifer yield conversion relation, when Membrane probing is different from module testing condition, the pressure of Membrane probing follow-up water salinity is converted to the unit are diaphragm aquifer yield obtained under the pressure be equal to module testing follows concentration, just can draw actual membrane element aquifer yield, compared with prior art, advantage of the present invention is: when its unit are diaphragm aquifer yield of reverse-osmosis membrane element of certain model and the computing formula of membrane component aquifer yield conversion relation are once determine, effective help is provided to understanding the membrane component aquifer yield value range that will roll subsequently through diaphragm unit are aquifer yield, improve diaphragm utilization ratio, according to the difference of unit are diaphragm aquifer yield, can judge that this type diaphragm can roll into the membrane component of which kind of throughput requirements fast.
Description
Technical field
The invention belongs to reverse osmosis design basis and applied technical field, be specifically related to the computational methods of a kind of counter-infiltration diaphragm unit are aquifer yield and membrane component aquifer yield conversion relation.
Background technology
As the core parts of water treatment, reverse osmosis membrane is the key realizing water treatment field depth-type filtration, and it is a kind of artificial pellicle with certain characteristic of simulating biological semi-permeable film and making, and is all generally that the macromolecular material adopted is made.Such as CAM and aromatic polyhydrazide film and aromatic polyamide film etc.The diameter of the micropore on its surface is generally between 0.5 ~ 10nm, and the size of permeability has certain relation with the structure of the chemistry of of film itself.Along with the continuous application of the membrane separation technique of China, reverse osmosis technology is with one of technology the most with fastest developing speed becoming the application of China, the maximum field of the application of the industry of the reverse osmosis membrane of China is still be large-scale boiler feedwater and various industrial pure waters, and the scale in the market of drinking water is taken second place.Environmental protection and electronics and medical treatment, the application of food and drink and chemical industry is also in the scale that formation is gradually certain.
At present, reverse-osmosis membrane element is generally made up of the material of following difference in functionality: water inlet flow channel cloth, product water flow passage cloth, counter-infiltration diaphragm, collector pipe, Y-shaped ring etc.; By testing counter-infiltration diaphragm, suitable diaphragm performance is selected to roll reverse-osmosis membrane element, produce water flow passage cloth to be connected with collector pipe, blend compounds water along perpendicular to collector pipe both sides and be parallel to base and the counter-infiltration diaphragm sealing backside of collector pipe, play the collection guide functions of permeate, water inlet flow channel cloth and counter-infiltration diaphragm front face, play into water guide functions, membrane component roll-forming after finally being sealed by gluing, after drying, fitting tight circle uses.
Different model reverse-osmosis membrane element, the standard test condition of its performance characterization, normally according to the suitable operating pressure of difference water inlet salinity selective membrane element, reach membrane component nominal performance, the main two indices weighing reverse-osmosis membrane element is salt rejection rate and aquifer yield, and the present invention mainly discusses the influence factor, corresponding relation etc. of diaphragm and membrane component aquifer yield.Affect a lot of because have of aquifer yield in membrane element capability: temperature, produce water flow passage cloth material and structure, the quantity of gully-hole and arrangement in collector pipe, effective film area, diaphragm unit are aquifer yield etc., the influence factor of front several respects more depends on technological design in coiling process, the selection etc. of raw material, diaphragm unit are aquifer yield then becomes the deciding factor affecting membrane component aquifer yield, for now, in the diaphragm unit are aquifer yield that membrane component and diaphragm obtain under different test condition, and corresponding relation is not yet determined between membrane component aquifer yield.
Summary of the invention
In order to the performance of better controlling diaphragm element, must be definite know unit are diaphragm aquifer yield and roll into aquifer yield corresponding relation after membrane component, the invention provides the computational methods of a kind of counter-infiltration unit are diaphragm aquifer yield and membrane component aquifer yield conversion relation, directly can directly obtain its corresponding membrane component aquifer yield X by unit are diaphragm aquifer yield Y by these computational methods:
1) Membrane probing and module testing be same pressure, under salinity of intaking: the corresponding relation of membrane component aquifer yield and unit diaphragm aquifer yield is: the theoretical diaphragm aquifer yield Y* of theoretical membrane component aquifer yield X=theoretical effective film area S.
2) but in a lot of actual conditions, Membrane probing and module testing carry out when different pressures, different water inlet salinity, this kind of situation we by algorithm provided by the invention the test condition of diaphragm aquifer yield is converted into diaphragm aquifer yield under the test condition be equal to assembly, that is: actual membrane element aquifer yield X
/=with the diaphragm aquifer yield Y under assembly equality testing condition
/* actual effective film area S
/.
Above-mentionedly can to find out, when Membrane probing is different from module testing condition, the pressure of Membrane probing to be converted to the pressure that is equal to module testing with concentration with the unit are diaphragm aquifer yield Y obtained under concentration
/, just can draw actual membrane element aquifer yield X
/, for the ease of understanding, the theory first providing technical solution of the present invention illustrates:
1, the factor affecting diaphragm unit are aquifer yield is determined:
Affect diaphragm unit are aquifer yield because have: temperature, pressure, influent density, former water ph value and diaphragm water intake mode etc.
A, temperature.
Temperature is larger on diaphragm, the impact of membrane component aquifer yield, membrane component usually with 25 DEG C for standard test temperature, the aquifer yield surveyed at such a temperature is as the benchmark aquifer yield of membrane component or diaphragm, at other temperature, all can be remedied to the aquifer yield of unit plane integrated membrane sheet or the aquifer yield of membrane component under normal temperature by temperature correction facotor, therefore temperature can not produce considerable influence to this kind of computational methods.
B, water inlet salinity.
Osmotic pressure is the function of contained salinity or organic concentration and kind in water, and salinity increases, and osmotic pressure also can increase, and the size of water inlet driving pressure depends primarily on into the salt content in water.If maintain constant pressure, salt content is higher, and flux will be lower.Carrying out data analysis by doing diaphragm flux-concentration experiment, can find out that diaphragm flux slowly reduces along with the increase of influent density, as shown in Figure 1.
C, pressure.
Intake pressure is mainly used in overcoming naturally osmotic pressure, obtains: the aquifer yield (gpd) of diaphragm is proportional with intake pressure (mpa), as shown in Figure 2 through repeatedly doing diaphragm flux-intake pressure experiment.
D, water intake mode:
Because the final form of diaphragm and membrane component is inconsistent, diaphragm is planar structure, and membrane component is spiral wound configuration, then cause the diaphragm of the two different through water mode, the water of Membrane probing through mode be vertically through, membrane component test water through mode be spiral cross-flow through.The present invention consider Membrane probing water through mode be based on vertically through, for spiral wound film element, then can there is certain error with diaphragm aquifer yield actual value, the gap of the two can be taken into account by the present invention.
e、PH：
Ph value refers to the acid-base value of system water inlet, and the salt rejection rate of membrane component affects comparatively large by PH, water flux also has the impact of certain slight extent.As shown in Figure 3, under normal circumstances, for ensureing the salt rejection rate of membrane component, diaphragm and membrane component test condition generally maintain about PH=7.5, and the present invention ignores the impact of pH value on this computing formula.
F, other material factors are all got rid of, and contrast under selecting identical conditions
.
By the above-mentioned analysis on affecting diaphragm flux factor, we are following, provide concrete technical scheme of the present invention, namely how directly to calculate its corresponding membrane component aquifer yield by counter-infiltration diaphragm unit are aquifer yield, its defining method comprises the following steps:
(1) service condition of clear membrane element aquifer yield is first needed: operating pressure is P
1, water inlet salinity is μ
1, the rate of recovery controls 15%; Secondly the test condition of clear and definite unit are diaphragm aquifer yield: detected pressures is P
2, water inlet salinity is μ
2, temperature is 25 DEG C (as at other temperature, usable temp coefficient corrects), and when membrane component aquifer yield is different from unit diaphragm aquifer yield test condition, we need to know and the actual aquifer yield Y of unit are diaphragm under membrane component condition of equivalent
5, so membrane component aquifer yield X just can be determined by (a):
X=Y
5*S
2（a）
Wherein:
X is membrane component aquifer yield, and unit is gpd
Y
5for with the actual aquifer yield of unit are diaphragm under membrane component condition of equivalent, unit is gfd,
S
2for the actual effective film area of membrane component, unit is ft
2,
Can be found out by above-mentioned, membrane component actual effective film area S
2for definite value, as long as determine Y
5just can obtain corresponding membrane element aquifer yield X.
(2) we establish P
3, μ
3be respectively and the pressure of membrane component under equal testing conditions, salinity of intaking and temperature parameter value, then P in (1)
1=P
3, μ
1=μ
3, Y3, for testing obtained unit are diaphragm aquifer yield under this condition, ignores the impact of other factors, when salinity of intaking is certain, if only consider pressure on the impact of unit are diaphragm aquifer yield Y, pressure P and unit diaphragm aquifer yield Y proportional, then Y
2k is converted into by pressure dependence
3, μ
3unit are diaphragm aquifer yield Y under condition
4determine by (b):
Y
4=P
3/P
2*Y
2（b）
And Y
4< Y
3< Y
5
Wherein: Y
4for Y
2p is converted into by means of only pressure dependence
3, μ
3unit are diaphragm aquifer yield under condition, unit is gfd,
Y
3for P
3, μ
3unit are diaphragm aquifer yield under test condition, unit is gfd
Y
2for P
2, μ
2unit are diaphragm aquifer yield under standard test condition, unit is gfd
P
2for the standard testing pressure of unit area diaphragm aquifer yield, units MPa,
P
3for being equal to the pressure under testing conditions with membrane component, units MPa,
(3) if ignore the impact of other factors, only consider that water inlet salinity μ is on the impact of unit are diaphragm aquifer yield Y, by diaphragm checkout gear, carry out testing (diaphragm aquifer yield numerical value is same diaphragm gained under different condition test):
P
2, μ
2unit are diaphragm aquifer yield under standard test condition is Y
2,
P
2, μ
3the actual aquifer yield of unit are diaphragm under test condition is Y
6,
P
3, μ
3the actual aquifer yield of unit are diaphragm under test condition is Y
7,
P
3, μ
2the actual aquifer yield of unit are diaphragm under test condition is Y
8,
When Membrane probing constant pressure is at P
2time, water inlet salinity is by μ
2drop to μ
3time, then diaphragm aquifer yield changing value △ T=Y
6-Y
2,
When Membrane probing constant pressure is at P
3time, water inlet salinity is by μ
2drop to μ
3time, then diaphragm aquifer yield changing value △ N=Y
8-Y
7,
In sum, only consider that concentration is on the impact of unit are aquifer yield, when Membrane probing condition is by P
2, μ
2change into P
3, μ
3time, its unit are diaphragm aquifer yield changing value △ Y determines by (c):
△Y=（△T+△N）/2
=（Y6-Y2+Y8-Y7）/2
For ensureing the accuracy of Membrane probing data, can choose different RW Membrane probing, △ T, △ N average, that is:
△Y=（
△T+
△N）/2（c）
(4) the final form because of diaphragm and membrane component is inconsistent, diaphragm is planar structure, membrane component is spiral wound configuration, then cause the diaphragm of the two different through water mode, the water of Membrane probing through mode be vertically through, the water of membrane component test through mode be spiral cross-flow through, so we are different due to two kinds of water intake modes and unit are diaphragm aquifer yield difference △ Z that is that produce determines by (d)
△Z=X
1/S
2-Y
3（d）
Wherein: X
1for P
1, μ
1membrane component aquifer yield under test condition, unit is gpd,
Y
3for P
3, μ
3unit are diaphragm aquifer yield under test condition, unit is gfd
S
2for the actual effective film area of membrane component, unit is ft
2,
For making △ Z more accurate, many group diaphragms can be chosen at P
3, μ
3measuring unit area diaphragm aquifer yield Y under test condition
3, with roll-film corresponding with it to corresponding membrane element, test membrane element aquifer yield X at the standard conditions
1, calculate △ Z by formula (d), get its average, draw:
△ Z.
In sum, when membrane component aquifer yield is different from unit are diaphragm aquifer yield testing standard, at P
2, μ
2the unit are aquifer yield Y obtained under standard test condition
2and with the actual aquifer yield Y of unit are diaphragm under membrane component condition of equivalent
5between quantitative relationship as step (2) (3) (4) describe, so with the actual aquifer yield Y of unit are diaphragm under membrane component condition of equivalent
5determine by (e):
Y
5=Y
4+△Y+△Z
=P
3/P
2*Y
2+（△T+△N）/2+△Z
=P
3/P
2*Y
2+（Y
6-Y
2+Y
8-Y
7）/2+X
1/S
2-Y
3（e）
Wherein:
Y
2for P
2, μ
2unit are diaphragm aquifer yield under standard test condition, unit is gfd,
Y
6for P
2, μ
3the actual aquifer yield of unit are diaphragm under test condition, unit is gfd,
Y
7for P
3, μ
3the actual aquifer yield of unit are diaphragm under test condition, unit is gfd,
Y
8for P
3, μ
2the actual aquifer yield of unit are diaphragm under test condition, unit is gfd,
X
1for P
1, μ
1membrane component aquifer yield under test condition, unit is gpd,
P
2for the standard testing pressure of unit area diaphragm aquifer yield, units MPa,
P
3for being equal to the pressure under testing conditions with membrane component, units MPa,
Formula b, c, d are all substituted into formula f below, just can obtain membrane component aquifer yield X:
X=Y
5*S
2（f）
X=[P
3/P
2*Y
2+(
△T+
△N）/2+
△Z]*S
2（g）
Wherein:
△ T is that Membrane probing constant pressure is at P
2time, water inlet salinity is by μ
2drop to μ
3time the average of diaphragm aquifer yield changing value, unit is gfd,
△ N is that Membrane probing constant pressure is at P
3time, water inlet salinity is by μ
2drop to μ
3time the average of diaphragm aquifer yield changing value, unit is gfd,
△ Z is the average of the unit are diaphragm aquifer yield changing value that two kinds of water intake mode differences produce, and unit is gfd.
Compared with prior art, advantage of the present invention is: when its unit are diaphragm aquifer yield of reverse-osmosis membrane element of certain model and the computing formula of membrane component aquifer yield conversion relation are once determine, effective help is provided to understanding the membrane component aquifer yield value range that will roll subsequently through diaphragm unit are aquifer yield, improve diaphragm utilization ratio, according to the difference of unit are diaphragm aquifer yield, can judge that this type diaphragm can roll into the membrane component of which kind of throughput requirements fast.
Accompanying drawing explanation
Fig. 1 is the influence curve figure of influent density to flux;
Fig. 2 is the influence curve figure of intake pressure to flux;
Fig. 3 is the influence curve figure of pH value to flux.
Detailed description of the invention
According to above-mentioned analysis, below for 1812-50 membrane component, concrete set forth the aquifer yield how being gone out this membrane component by counter-infiltration unit are diaphragm Calculation of Water producing capacity, its circular comprises the following steps:
(1) selected diaphragm unit are diaphragm aquifer yield test condition is: water inlet salinity 2000 μ S/cm, detected pressures 1MPa, this diaphragm is used to roll 1812-50 membrane component, membrane component service condition is: water inlet salinity 600 μ S/cm, detected pressures 0.5MPa, measures 1812-50 membrane component effective film area average
s=4ft
2.
(2) selected 3 groups of different diaphragms, the following several groups of data of test:
1. at water inlet salinity 2000 μ S/cm, measuring unit area diaphragm aquifer yield under detected pressures 1MPa condition,
2. at water inlet salinity 600 μ S/cm, measuring unit area diaphragm aquifer yield under detected pressures 1MPa condition,
3. at water inlet salinity 2000 μ S/cm, measuring unit area diaphragm output under detected pressures 0.5MPa condition,
4. at water inlet salinity 600 μ S/cm, measuring unit area diaphragm aquifer yield under detected pressures 0.5MPa condition,
Concrete method of testing is as follows: test condition: A: constant pressure 0.5MPa; Former coolant-temperature gage remains on 25 DEG C, runs 15min, record aquifer yield.Pressure remains unchanged, and influent density is adjusted to 2000 μ S/cm, runs 15min, record aquifer yield.B: constant pressure 1MPa, other conditions are constant.(table 2-1 is the test data of 3 groups of different diaphragms)
Table 2-1(note: in table, unit are diaphragm aquifer yield GFD all obtains 25 DEG C of tests)
First unit are diaphragm aquifer yield changing value △ Y is determined:
△T
1=27-25，△T
2=26.5-24，△T
3=28.3-26
△N
1=15.2-12.7，△N
2=14.3-12.4，△N
3=16.1-13.3
△T=（△T
1+△T
2+△T
3）/3=（27-25+26.5-24+28.3-26）/3=2.27gfd
△N=（△N
1+△N
2+△N
3/3=（15.2-12.7+14.3-12.4+16.1-13.3）/3=2.4gfd
Then unit are diaphragm aquifer yield changing value △ Y is:
△Y=（
△T+
△N）/2=（2.27+2.4）/2=2.335gfd
(3) roll 1812-50 membrane component respectively with above-mentioned 3 groups of selected diaphragms, often organize diaphragm and roll up 1, at influent density 600 μ S/cm, test membrane element aquifer yield under the standard test condition of detected pressures 0.5MPa, test data is as table 2-2
Table 2-2(note: in table, unit are membrane component aquifer yield GPD all obtains 25 DEG C of tests)
So just can determine the unit are diaphragm aquifer yield changing value △ Z produced due to water intake mode difference according to data in table, by above-mentioned known: △ Z=X
1/ S
2-Y
3, so:
△Z
1=68/4-15.2，△Z
2=65/4-14.3，△Z
3=69/4-16.1
Then
△ Z=(△ Z
1+ △ Z
2+ △ Z
3)/3=(68/4-15.2+65/4-14.3+69/4-16.1)/3=1.63gfd
So 1812-50 membrane component Calculation of Water producing capacity formula can be determined according to formula (g):
X=[P
3/P
2*Y
2+(
△T+
△N）/2+
△Z]*S
2
=[(0.5/1)*Y
2+(2.27+2.4)/2+1.63]*4
Arrange: 1812-50 membrane component aquifer yield X=2Y
2+ 16
Wherein:
X is 1812-50 membrane component aquifer yield, and unit is gpd,
Y
2for at water inlet salinity 2000 μ S/cm, the unit are diaphragm aquifer yield under detected pressures 1MPa test condition, unit is gfd,
General 1812-50 membrane component aquifer yield is 50-65gpd, substitutes in formula (g), obtains rolling up the unit are diaphragm aquifer yield Y needed to 1812-50 membrane component under standard test condition
2at the diaphragm of 17-25gfd.
By above-mentioned analysis, choose the roll-film of flux at 17-25gfd to 1812-50 membrane component 5, (water inlet salinity 600 μ S/cm under following test condition afterwards, detected pressures 0.5MPa, it is 15% that the rate of recovery controls, temperature 25 DEG C) test membrane element aquifer yield, compare with the direct membrane component aquifer yield obtained by these computational methods, it is repeatedly below one group of actual test data, as table 2-3
Table 2-3
Can be found out by table 2-3: the aquifer yield of the 1812-50 membrane component drawn by these computational methods and the membrane component aquifer yield under standard test condition are close to consistent, its error is in allowed band, by above-mentioned test among a small circle and contrast, can produce a desired effect.
Instructed by these computational methods and roll membrane component, fast unit diaphragm aquifer yield value range can be determined, avoid the waste caused with the too high or too low roll-film masking element of unit diaphragm aquifer yield, further Cost optimization, improves production efficiency.
According to actual conditions, can there is certain error in measuring unit area diaphragm aquifer yield, and effective film area also can exist certain error, and the membrane component aquifer yield calculated by this formula can be existed usually ± error of 2gpd, belong to normal phenomenon.
In sum: when its unit are diaphragm aquifer yield of reverse-osmosis membrane element of certain model and the computing formula of membrane component aquifer yield conversion relation are once determine, effective help is provided to understanding the membrane component aquifer yield value range that will roll subsequently through diaphragm unit are aquifer yield, improve diaphragm utilization ratio, according to the difference of unit are diaphragm aquifer yield, can judge that this type diaphragm can roll into the membrane component of which kind of throughput requirements fast.Those skilled in the art are to be understood that; more than illustrating is only an exemplary embodiments of the present invention; when not exceeding or do not depart from scope; technical solutions and their implementation methods of the present invention have multiple modification, improvement or equivalent variations, and these all should fall within the scope of protection of the present invention.
Claims (3)
1. computational methods for counter-infiltration unit are diaphragm aquifer yield and membrane component aquifer yield conversion relation, is characterized in that, comprise the following steps:
(1), first, the service condition of clear membrane element aquifer yield: operating pressure is P
1, water inlet salinity is μ
1; Secondly the standard test condition of clear and definite unit are diaphragm aquifer yield: standard detection pressure is P
2, water inlet salinity is μ
2; If P
3, μ
3be respectively and the pressure under the equal testing conditions of the service condition of membrane component aquifer yield, intake salinity, i.e. P
1=P
3, μ
1=μ
3, Y
3for testing obtained unit are diaphragm aquifer yield under this condition, ignore other factors impact, when intake salinity certain, if only consider pressure on the impact of unit are diaphragm aquifer yield Y, pressure P and unit diaphragm aquifer yield Y proportional, then Y
2p is converted into by pressure dependence
3, μ
3unit are diaphragm aquifer yield Y under condition
4determine by formula (b):
Y
4=P
3/P
2*Y
2（b）
Wherein: Y
4for Y
2p is converted into by means of only pressure dependence
3, μ
3unit are diaphragm aquifer yield under condition, unit is gfd,
Y
3for P
3, μ
3unit are diaphragm aquifer yield under test condition, unit is gfd,
Y
2for P
2, μ
2unit are diaphragm aquifer yield under standard test condition, unit is gfd,
P
2for the standard testing pressure of unit area diaphragm aquifer yield, units MPa,
P
3for being equal to the pressure under testing conditions with membrane component, units MPa,
μ
3for with the water inlet salinity under the equal service condition of membrane component, unit μ S/cm,
(2) if ignore the impact of other factors, only consider that water inlet salinity μ is on the impact of unit are diaphragm aquifer yield Y, by diaphragm checkout gear, tests, diaphragm aquifer yield numerical value is same diaphragm gained under different condition test:
P
2, μ
2unit are diaphragm aquifer yield under standard test condition is Y
2,
P
2, μ
3the actual aquifer yield of unit are diaphragm under test condition is Y
6,
P
3, μ
3the actual aquifer yield of unit are diaphragm under test condition is Y
7,
P
3, μ
2the actual aquifer yield of unit are diaphragm under test condition is Y
8,
When Membrane probing constant pressure is at P
2time, water inlet salinity is by μ
2drop to μ
3time, then diaphragm aquifer yield changing value △ T=Y
6-Y
2,
When Membrane probing constant pressure is at P
3time, water inlet salinity is by μ
2drop to μ
3time, then diaphragm aquifer yield changing value △ N=Y
8-Y
7,
In sum, only consider that concentration is on the impact of unit are aquifer yield, when Membrane probing condition is by P
2, μ
2change into P
3, μ
3time, its unit are diaphragm aquifer yield changing value △ Y determines by following formula:
△Y=（△T+△N）/2
=（Y6-Y2+Y8-Y7）/2
(3) the final form, because of diaphragm and membrane component is inconsistent, diaphragm is planar structure, membrane component is spiral wound configuration, then cause the diaphragm of the two different through water mode, the water of Membrane probing through mode be vertically through, the water of membrane component test through mode be spiral cross-flow through, so different due to two kinds of water intake modes and unit are diaphragm aquifer yield difference △ Z that is that produce determines by (d)
△Z=X
1/S
2-Y
3（d）
Wherein: X
1for P
1, μ
1membrane component aquifer yield under test condition, unit is gpd,
Y
3for P
3, μ
3unit are diaphragm aquifer yield under test condition, unit is gfd
S
2for the actual effective film area of membrane component, unit is ft
2,
(4), in sum, when membrane component aquifer yield is different from unit are diaphragm aquifer yield testing standard, at P
2, μ
2the unit are aquifer yield Y obtained under standard test condition
2and with the actual aquifer yield Y of unit are diaphragm under membrane component condition of equivalent
5between quantitative relationship as step (1) (2) (3) describe, so with the actual aquifer yield Y of unit are diaphragm under membrane component condition of equivalent
5determine by (e):
Y
5=Y
4+△Y+△Z
=P
3/P
2*Y
2+（△T+△N）/2+△Z
=P
3/P
2*Y
2+（Y
6-Y
2+Y
8-Y
7）/2+X
1/S
2-Y
3（e）
Wherein:
Y
2for P
2, μ
2unit are diaphragm aquifer yield under standard test condition, unit is gfd,
Y
6for P
2, μ
3the actual aquifer yield of unit are diaphragm under test condition, unit is gfd,
Y
7for P
3, μ
3the actual aquifer yield of unit are diaphragm under test condition, unit is gfd,
Y
8for P
3, μ
2the actual aquifer yield of unit are diaphragm under test condition, unit is gfd,
X
1for P
1, μ
1membrane component aquifer yield under test condition, unit is gpd,
P
2for the standard testing pressure of unit area diaphragm aquifer yield, units MPa,
P
3for being equal to the pressure under testing conditions with membrane component, units MPa;
Finally, membrane component aquifer yield X just can be determined by (f):
X=Y
5*S
2
=[P
3/P
2*Y
2+（Y
6-Y
2+Y
8-Y
7）/2）+X
1/S
2-Y
3]*S
2（f）
Wherein: X is membrane component aquifer yield, unit is gpd
S
2for the actual effective film area of membrane component, unit is ft
2.
2. the computational methods of counter-infiltration unit are diaphragm aquifer yield according to claim 1 and membrane component aquifer yield conversion relation, is characterized in that,
For ensureing the accuracy of Membrane probing data in described step (2), can choose different Membrane probing, △ T, △ N average, and namely △ Y can determine further by following formula (c) coming:
△Y=（
△T+
△N）/2（c）
For making △ Z more accurate in described step (3), many group diaphragms can be chosen at P
3, μ
3measuring unit area diaphragm aquifer yield Y under test condition
3, then use roll-film corresponding with it to corresponding membrane element, test membrane element aquifer yield X at the standard conditions
1, calculate △ Z by formula (d), get its average, draw:
△ Z;
In described step (4), membrane component aquifer yield X just can determine further by following formula (g) coming:
X=Y
5*S
2
=[P
3/P
2*Y
2+(
△T+
△N）/2+
△Z]*S
2（g）
Wherein:
△ T is that Membrane probing constant pressure is at P
2time, water inlet salinity is by μ
2drop to μ
3time the average of diaphragm aquifer yield changing value, unit is gfd,
△ N is that Membrane probing constant pressure is at P
3time, water inlet salinity is by μ
2drop to μ
3time the average of diaphragm aquifer yield changing value, unit is gfd,
△ Z is the average of the unit are diaphragm aquifer yield changing value that two kinds of water intake mode differences produce, and unit is gfd.
3. the computational methods of counter-infiltration unit are diaphragm aquifer yield according to claim 1 and 2 and membrane component aquifer yield conversion relation, it is characterized in that: the temperature in each test condition related in described computational methods is all chosen as 25 DEG C, and at other temperature, usable temp coefficient corrects.
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