CN105093924A - Method for lifting deep ocean water rich in nutritive salts by controlling air bubble curtain - Google Patents

Method for lifting deep ocean water rich in nutritive salts by controlling air bubble curtain Download PDF

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CN105093924A
CN105093924A CN201510402402.9A CN201510402402A CN105093924A CN 105093924 A CN105093924 A CN 105093924A CN 201510402402 A CN201510402402 A CN 201510402402A CN 105093924 A CN105093924 A CN 105093924A
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plume
sea water
deep sea
separated
gas injection
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CN201510402402.9A
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CN105093924B (en
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樊炜
强永发
陈鹰
徐驰骋
潘依雯
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浙江大学
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Abstract

The invention discloses a method for lifting deep ocean water rich in nutritive salts by controlling an air bubble curtain. The method belongs to the technical field of manually lifting current. The invention overcomes the deficiency of the manual lifting current theory in the prior art by providing such a controlling method to lift deep ocean water rich in nutritive salts with different flows and densities. The method controls the air bubble curtain in a manually lifting current to lift the height of deep ocean water rich in nutritive salts so that the deep ocean water rich in nutritive salts can be effectively captured at a density surface. Based on the method, it is possible for a performer to effectively adjust for a best air injection amount according to different ocean conditions, and therefore, energy consumption is reduced, gains are increased, and assistance is provided to scientists for them to carry out manually lifting current.

Description

A kind of air curtain promotes the control method of eutrophy salt deep sea water
Technical field
The present invention relates to artificial ocean upward flow technical field, particularly relate to the control method that a kind of air curtain promotes eutrophy salt deep sea water, be mainly used in controlling air curtain in artificial upward flow, promote the height of eutrophy salt deep sea water, caught by density interface with being effective.
Background technology
Have abundant nutriment in deep sea water (DOW), if carry it into ocean have photosphere, take in by phytoplankton, together with dissolve carbon dioxide and solar energy, can organism be produced by photosynthesis.No matter in any marine site and season, the nutritive salt composition such as nitrogen and phosphorus rising to photosphere can make phytoplankton blooms, just can promote the conversion to animal plankton and fish with the power of nature.Artificial ocean upward flow technology is exactly a kind of by laying marine settings at sea like this, forms a kind of technology to the marine stream on sea from seabed.Artificial ocean upward flow, as being conducive to a kind of method of repairing the marine eco-environment, can not only regulate the nutrition condition of seawater, promotes fecundity of the sea, can also increase carbon and converge, improve global warming.Current artificial ocean upward flow implementation mainly contains water pump type, wave pump type, riser type and airlift formula.Open type airlift artificial upward flow technology belongs to a kind of not containing the open type gas injection system gushing riser, it utilizes air pump to be directly pressed onto in deep sea water by air, drive eutrophy sea brine around to top layer by air curtain, compared with several artificial upward flow technology above, the advantages such as airlift has multiple confession to select the energy, lays conveniently, economic benefit is high.The shortcoming of airlift is the impact being subject to the factors such as gas injection rate, the gas injection degree of depth, ocean current speed, and the height driving DOW plume to rise is difficult to control.Gas injection rate is too low or the gas injection degree of depth is too dark or ocean current speed is excessive, DOW plume all may be caused to fail through density interface, thus can not caught by density interface and rest on top layer, so, artificial upward flow is just failed to reach and is promoted the object of deep sea water to top layer.Therefore how effectively regulating gas injection rate and the gas injection degree of depth to control by the height promoting DOW plume, is one of gordian technique of the artificial upward flow of open type airlift.
Drive at present the theoretical research comparative maturity of surrounding water about air curtain, but be mostly confined in the water body of static or non-layering, the research under the briny environment of flowing or different densities layering be there is no.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, propose the control method that a kind of air curtain promotes eutrophy salt deep sea water.
In order to achieve the above object, the technical solution adopted in the present invention is as follows: a kind of air curtain promotes the control method of eutrophy salt deep sea water, comprises the following steps:
(1) parameter acquiring of sea area condition: utilize conductivity-temperature-depth system CTD, temperature, salt profile and ocean current situation that acoustic Doppler fluid velocity profile instrument ADCP measures marine site to be measured, obtains the depth H of the density stratification in this marine site s, lower layer density value ρ a1and horizontal direction ocean current speed u c;
(2) track of air curtain track and deep sea water plume is calculated: set up x-z plane coordinate system in gas injection shower nozzle center; Just establish gas injection rate Q b0, and by the depth H of density stratification swith horizontal direction ocean current speed u csubstitute into formula (1) and (2), by formula (1) can obtain air curtain be separated with deep sea water plume before air curtain centrode, be called for short separation before air curtain centrode; By formula (2) can obtain air curtain be separated with deep sea water plume before deep sea water plume centrode, be called for short be separated before deep sea water plume centrode;
AB 4 u c x = B 3 z - 3 2 B 2 z 2 3 + 3 Bz 1 3 + 3 l n z - 1 3 z - 1 3 + B - - - ( 1 )
A u c x = 3 4 z 4 3 - - - ( 2 )
Wherein, coefficient A = [ 25 gQ b 0 H 0 ( 1 + λ 2 ) 24 α 2 π ( H 0 + Z 0 ) ] 1 / 3 , Coefficient B = v s A , Coefficient H 0=10.4 meters, Z 0for the degree of depth at gas injection shower nozzle place, α is for entrainmenting coefficient, and λ is Schmidt turbulence constant, u cfor horizontal direction ocean current speed, v sfor bubble slippage speed, g is acceleration of gravity;
(3) the front air curtain up-and-down boundary track of separation is calculated and deep sea water plume up-and-down boundary track before being separated:
According to width calculation formula (3), and in conjunction with formula (1) and (2), obtain being separated front air curtain up-and-down boundary track and being separated front deep sea water plume up-and-down boundary track:
w = d N 2 + z · t a n θ 2 - - - ( 3 )
Wherein, w is width; θ is cone angle; f rmfor revised Froude number; d nfor injection diameter, ρ bfor bubble density, d nfor gas injection jet diameters;
(4) before the separation obtained according to step (3) air curtain lower boundary track be separated before deep sea water plume coboundary track, obtain air curtain lower boundary track and the burble point being separated front deep sea water plume coboundary track before being separated, i.e. intersection point (x d, z d);
(5) the rear deep sea water plume centrode of separation is calculated:
According to the burble point (x that step (4) obtains d, z d), this burble point is brought into formula (4), obtains plume central speed v when being separated pm(z d):
v p m = [ 25 gQ b 0 H 0 ( 1 + λ 2 ) 24 α 2 π ( H 0 + Z 0 ) ] 1 / 3 · z - 1 / 3 - - - ( 4 )
Plume width w (z when being separated is obtained according to formula (3) d):
w ( z d ) = d N 2 + z d · t a n θ 2
By plume central speed v when being separated pm(z d) with plume width w (z when being separated d) be brought into formula (5), obtain being separated rear deep sea water plume centrode:
z ( x ) = z d + E [ M p 0 . x - x d u c - G p - B p 2 · ( x - x d u c ) 2 ] - - - ( 5 )
Wherein, M p 0 = π ( v p m 2 ( z d ) + u c 2 ) · w 2 ( z d ) · ρ p ( z d ) 2 s i n β ( z d ) , M p0represent the momentum flux of deep sea water plume; β (z d) for being separated time plume speed and the angle of horizontal direction; E = 2 ρ p ( z d ) · π v p m 2 ( z d ) + u c 2 · w 2 ( z d ) For coefficient; G p - B p = π v p m 2 ( z d ) + u c 2 ( ρ p ( z d ) - ρ a 1 ) gw 2 ( z d ) s i n β ( z d ) , G p-B prepresent the gravitational flux G of deep sea water plume pwith buoyance flux B pdifference; ρ p(z d) be plume density during separation;
(6) separation deep sea water plume centrode peak is solved:
When time, the momentum M of deep sea water plume vertical direction pvanishing, obtains the peak (x of deep sea water plume centrode after being separated max, z max),
x m a x = x d + M p 0 u c G p - B p
z m a x = z d + G p - B p 2 · E · ( x - x d u c ) 2
(7) relatively and regulate gas injection rate:
According to the peak (x of deep sea water plume centrode after the separation that step (6) obtains max, z max); By the maximum height z that deep sea water plume centrode after separation can arrive maxwith density stratification height H scompare; If z max< H s, gas injection rate Q is described b0not, need to improve gas injection rate Q b0; If z max> H s, gas injection rate Q is described b0surplus, can suitably reduce gas injection rate Q b0; If z max=H sgas injection rate Q is now described b0for promoting the best gas injection rate of eutrophy salt deep sea water;
(8) try to achieve best gas injection rate: the step repeating step (2)-(7), repeatedly regulate gas injection rate Q b0, until obtain best gas injection rate.
Compared with prior art, the invention has the beneficial effects as follows: the present invention proposes the control method that a kind of air curtain promotes eutrophy salt deep sea water, can according to the situation of the ocean current of different waters and density stratification, calculate best gas injection rate, make it possible to lowest energy consumption, eutrophy salt deep sea water be risen on density interface, and catch by density interface, thus greatly reduce energy consumption and increase the benefit, carry out the engineering projects such as artificial upward flow, blue carbon engineering, marine ecology pasture and harbour ice for scientist and provide help.
Accompanying drawing explanation
Fig. 1 is the artificial upward flow overall schematic of open type airlift;
In figure, Q b0for gas flow, u cfor horizontal direction ocean current speed, Z 0for the degree of depth at gas injection port place, H sfor the degree of depth of density stratification, z dfor the degree of depth of burble point, d nfor gas injection jet diameters, z maxfor being separated rear DOW plume centrode maximum height;
Fig. 2 is gas injection rate control flow chart.
Embodiment
Below in conjunction with Figure of description, the present invention is described further.
In order to can the eutrophy salt of deep sea water be risen on density interface, the invention provides the control method that a kind of air curtain promotes eutrophy salt deep sea water, specifically comprise the following steps:
(1) parameter acquiring of sea area condition: utilize conductivity-temperature-depth system CTD, temperature, salt profile and ocean current situation that acoustic Doppler fluid velocity profile instrument ADCP measures marine site to be measured, obtains the depth H of the density stratification in this marine site s, lower layer density value ρ a1and horizontal direction ocean current speed u c;
(2) track of air curtain track and DOW plume is calculated: set up x-z plane coordinate system in gas injection shower nozzle center; Just establish gas injection rate Q b0, and by the depth H of density stratification swith horizontal direction ocean current speed u csubstitute into formula (1) and (2), by formula (1) can obtain air curtain be separated with DOW plume before air curtain centrode, be called for short separation before air curtain centrode; By formula (2) can obtain air curtain be separated with DOW plume before DOW plume centrode, be called for short be separated before DOW plume centrode;
AB 4 u c x = B 3 z - 3 2 B 2 z 2 3 + 3 Bz 1 3 + 3 l n z - 1 3 z - 1 3 + B - - - ( 1 )
A u c x = 3 4 z 4 3 - - - ( 2 )
Wherein, coefficient A = &lsqb; 25 gQ b 0 H 0 ( 1 + &lambda; 2 ) 24 &alpha; 2 &pi; ( H 0 + Z 0 ) &rsqb; 1 / 3 , Coefficient B = v s A , Coefficient H 0=10.4 meters, Z 0for the degree of depth at gas injection shower nozzle place, α is for entrainmenting coefficient, and λ is Schmidt turbulence constant, u cfor horizontal direction ocean current speed, v sfor bubble slippage speed, g is acceleration of gravity;
(3) the front air curtain up-and-down boundary track of separation is calculated and DOW plume up-and-down boundary track before being separated:
According to width calculation formula (3), and in conjunction with formula (1) and (2), obtain being separated front air curtain up-and-down boundary track and being separated front DOW plume up-and-down boundary track:
w = d N 2 + z &CenterDot; t a n &theta; 2 - - - ( 3 )
Wherein, w is width; θ is cone angle; f rmfor revised Froude number; d nfor injection diameter, ρ bfor bubble density, d nfor gas injection jet diameters;
(4) before the separation obtained according to step (3) air curtain lower boundary track be separated before DOW plume coboundary track, obtain air curtain lower boundary track before being separated and be separated the burble point of front DOW plume coboundary track, i.e. intersection point (x d, z d);
(5) the rear DOW plume centrode of separation is calculated:
According to the burble point (x that step (4) obtains d, z d), this burble point is brought into formula (4), obtains plume central speed v when being separated pm(z d):
v p m = &lsqb; 25 gQ b 0 H 0 ( 1 + &lambda; 2 ) 24 &alpha; 2 &pi; ( H 0 + Z 0 ) &rsqb; 1 / 3 &CenterDot; z - 1 / 3 - - - ( 4 )
Plume width w (z when being separated is obtained according to formula (3) d):
w ( z d ) = d N 2 + z d &CenterDot; t a n &theta; 2
By plume central speed v when being separated pm(z d) with plume width w (z when being separated d) be brought into formula (5), obtain being separated rear DOW plume centrode:
z ( x ) = z d + E &lsqb; M p 0 . x - x d u c - G p - B p 2 &CenterDot; ( x - x d u c ) 2 &rsqb; - - - ( 5 )
Wherein, M p 0 = &pi; ( v p m 2 ( z d ) + u c 2 ) &CenterDot; w 2 ( z d ) &CenterDot; &rho; p ( z d ) 2 s i n &beta; ( z d ) , M p0represent the momentum flux of DOW plume; β (z d) for being separated time plume speed and the angle of horizontal direction; E = 2 &rho; p ( z d ) &CenterDot; &pi; v p m 2 ( z d ) + u c 2 &CenterDot; w 2 ( z d ) For coefficient; G p - B p = &pi; v p m 2 ( z d ) + u c 2 ( &rho; p ( z d ) - &rho; a 1 ) gw 2 ( z d ) s i n &beta; ( z d ) , G p-B prepresent the gravitational flux G of DOW plume pwith buoyance flux B pdifference; ρ p(z d) be plume density during separation;
(6) separation DOW plume centrode peak is solved:
When time, the momentum M of DOW plume vertical direction pvanishing, obtains the peak (x of DOW plume centrode after being separated max, z max),
x m a x = x d + M p 0 u c G p - B p
z m a x = z d + G p - B p 2 &CenterDot; E &CenterDot; ( x - x d u c ) 2
(7) relatively and regulate gas injection rate:
According to the peak (x of DOW plume centrode after the separation that step (6) obtains max, z max); By the maximum height z that DOW plume centrode after separation can arrive maxwith density stratification height H scompare; If z max< H s, gas injection rate Q is described b0not, need to improve gas injection rate Q b0; If z max> H s, gas injection rate Q is described b0surplus, can suitably reduce gas injection rate Q b0; If z max=H sgas injection rate Q is now described b0for promoting the best gas injection rate of eutrophy salt deep sea water;
(8) try to achieve best gas injection rate: the step repeating step (2)-(7), repeatedly regulate gas injection rate Q b0, until obtain best gas injection rate.

Claims (1)

1. air curtain promotes a control method for eutrophy salt deep sea water, and it is characterized in that, the method comprises the steps:
(1) parameter acquiring of sea area condition: utilize conductivity-temperature-depth system CTD, temperature, salt profile and ocean current situation that acoustic Doppler fluid velocity profile instrument ADCP measures marine site to be measured, obtains the depth H of the density stratification in this marine site s, lower layer density value ρ a1and horizontal direction ocean current speed u cetc. parameter;
(2) track of air curtain track and deep sea water plume is calculated: set up x-z plane coordinate system in gas injection shower nozzle center; Just establish gas injection rate Q b0, and by the depth H of density stratification swith horizontal direction ocean current speed u csubstitute into formula (1) and (2), by formula (1) can obtain air curtain be separated with deep sea water plume before air curtain centrode, be called for short separation before air curtain centrode; By formula (2) can obtain air curtain be separated with deep sea water plume before deep sea water plume centrode, be called for short be separated before deep sea water plume centrode;
AB 4 u c x = B 3 z - 3 2 B 2 z 2 3 + 3 Bz 1 3 + 3 l n z - 1 3 z 1 3 + B - - - ( 1 )
A u c x = 3 4 z 4 3 - - - ( 2 )
Wherein, coefficient A = &lsqb; 25 gQ b 0 H 0 ( 1 + &lambda; 2 ) 24 &alpha; 2 &pi; ( H 0 + Z 0 ) &rsqb; 1 / 3 , Coefficient B = v s A , Coefficient H 0=10.4 meters, Z 0for the degree of depth at gas injection shower nozzle place, α is for entrainmenting coefficient, and λ is Schmidt turbulence constant, u cfor horizontal direction ocean current speed, v sfor bubble slippage speed, g is acceleration of gravity;
(3) the front air curtain up-and-down boundary track of separation is calculated and deep sea water plume up-and-down boundary track before being separated:
According to width calculation formula (3), and in conjunction with formula (1) and (2), obtain being separated front air curtain up-and-down boundary track and being separated front deep sea water plume up-and-down boundary track:
w = d N 2 + z &CenterDot; t a n &theta; 2 - - - ( 3 )
Wherein, w is width; θ is cone angle; f rmfor revised Froude number; d nfor injection diameter, ρ bfor bubble density, d nfor gas injection jet diameters;
(4) before the separation obtained according to step (3) air curtain lower boundary track be separated before deep sea water plume coboundary track, obtain air curtain lower boundary track and the burble point being separated front deep sea water plume coboundary track before being separated, i.e. intersection point (x d, z d);
(5) the rear deep sea water plume centrode of separation is calculated:
According to the burble point (x that step (4) obtains d, z d), this burble point is brought into formula (4), obtains plume central speed v when being separated pm(z d):
v p m = &lsqb; 25 gQ b 0 H 0 ( 1 + &lambda; 2 ) 24 &alpha; 2 &pi; ( H 0 + Z 0 ) &rsqb; 1 / 3 &CenterDot; z - 1 / 3 - - - ( 4 )
Plume width w (z when being separated is obtained according to formula (3) d):
w ( z d ) = d N 2 + z d &CenterDot; t a n &theta; 2
By plume central speed v when being separated pm(z d) with plume width w (z when being separated d) be brought into formula (5), obtain being separated rear deep sea water plume centrode:
z ( x ) = z d + E &lsqb; M p 0 . x - x d u c - G p - B p 2 &CenterDot; ( x - x d u c ) 2 &rsqb; - - - ( 5 )
Wherein, M p 0 = &pi; ( v p m 2 ( z d ) + u c 2 ) &CenterDot; w 2 ( z d ) &CenterDot; &rho; p ( z d ) 2 s i n &beta; ( z d ) , M p0represent the momentum flux of deep sea water plume; β (z d) for being separated time plume speed and the angle of horizontal direction; E = 2 &rho; p ( z d ) &CenterDot; &pi; v p m 2 ( z d ) + u c 2 &CenterDot; w 2 ( z d ) For coefficient; G p - B p = &pi; v p m 2 ( z d ) + u c 2 ( &rho; p ( z d ) - &rho; a 1 ) gw 2 ( z d ) s i n &beta; ( z d ) , G p-B prepresent the gravitational flux G of deep sea water plume pwith buoyance flux B pdifference; ρ p(z d) be plume density during separation;
(6) separation deep sea water plume centrode peak is solved:
When time, the momentum M of deep sea water plume vertical direction pvanishing, obtains the peak (x of deep sea water plume centrode after being separated max, z max),
x m a x = x d + M p 0 u c G p - B p
z m a x = z d + G p - B p 2 &CenterDot; E &CenterDot; ( x - x d u c ) 2
(7) relatively and regulate gas injection rate:
According to the peak (x of deep sea water plume centrode after the separation that step (6) obtains max, z max); By the maximum height z that deep sea water plume centrode after separation can arrive maxwith density stratification height H scompare; If z max< H s, gas injection rate Q is described b0not, need to improve gas injection rate Q b0; If z max> H s, gas injection rate Q is described b0surplus, can suitably reduce gas injection rate Q b0; If z max=H sgas injection rate Q is now described b0for promoting the best gas injection rate of eutrophy salt deep sea water;
(8) try to achieve best gas injection rate: the step repeating step (2)-(7), repeatedly regulate gas injection rate Q b0, until obtain best gas injection rate.
CN201510402402.9A 2015-07-08 2015-07-08 A kind of air curtain lifts the control method of eutrophy salt deep sea water CN105093924B (en)

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Publication number Priority date Publication date Assignee Title
CN111302473A (en) * 2020-03-04 2020-06-19 浙江大学 Sediment nutritive salt lifting device based on air curtain type artificial upwelling

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CN203827876U (en) * 2014-05-20 2014-09-17 杭州电子科技大学 Thermal differential type seafloor nutritive salt lifting device
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