CN105093924B - A kind of air curtain lifts the control method of eutrophy salt deep sea water - Google Patents

A kind of air curtain lifts the control method of eutrophy salt deep sea water Download PDF

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CN105093924B
CN105093924B CN201510402402.9A CN201510402402A CN105093924B CN 105093924 B CN105093924 B CN 105093924B CN 201510402402 A CN201510402402 A CN 201510402402A CN 105093924 B CN105093924 B CN 105093924B
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sea water
plume
deep sea
separation
air curtain
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CN201510402402.9A
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CN105093924A (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 the control method that a kind of air curtain lifts eutrophy salt deep sea water, belong to artificial ocean upper up-flow technical field.The present invention is for the theoretical deficiency of existing artificial upper up-flow airlift, and proposition research air curtain under the marine environment that flowing, different densities are layered lifts the control method of eutrophy deep sea water.Present invention is mainly used for control air curtain in artificial upper up-flow, lift the height of eutrophy salt deep sea water, captured by density interface with being effective, so that optimal gas injection rate can be effectively adjusted according to different waters situation in practical operation, reduce energy consumption to increase the benefit, carrying out the projects such as artificial upper up-flow, blue carbon engineering, marine ecology pasture for scientist provides help.

Description

A kind of air curtain lifts the control method of eutrophy salt deep sea water
Technical field
The present invention relates to artificial ocean upper up-flow technical field, more particularly to a kind of air curtain lifting eutrophy salt deep layer sea The control method of water, is mainly used in controlling air curtain in artificial upper up-flow, lifts the height of eutrophy salt deep sea water, be allowed to Effect ground is captured by density interface.
Background technology
There is abundant nutriment in deep sea water (DOW), if carrying it into ocean has photosphere, taken the photograph by phytoplankton Enter, together with the carbon dioxide and solar energy of dissolving, organic matter can be produced by photosynthesis.No matter in any marine site And season, phytoplankton blooms can be made by rising to the nutrition such as nitrogen and phosphorus of photosphere salt component, can just be pushed away with the power of nature Trend zooplankter and the conversion of fish.Artificial ocean rising Flow Technique is exactly such a by sea laying ocean dress It is standby, form a kind of technology of the seawater flowing from seabed to sea.Artificial ocean upper up-flow as be conducive to repair marine ecology A kind of method of environment, can not only adjust the nutrition condition of seawater, lift fecundity of the sea, moreover it is possible to increase carbon remittance, improve the whole world Warm.Current artificial ocean upper up-flow implementation mainly has water pump type, wave pump type, riser type and airlift formula.Open Formula airlift manually rises Flow Technique and belongs to a kind of not containing the open type gas injection system for gushing riser, and it is directly by sky using air pump Air pressure is into deep sea water, by the eutrophy sea brine around air curtain drive to top layer, with above several artificial upper up-flows Technology is compared, and airlift has a variety of for selecting the energy, laying the advantages such as convenience, economic benefit height.The shortcoming of airlift is Easily influenceed by factors such as gas injection rate, gas injection depth, ocean current speed, the height for driving DOW plumes to rise is difficult to control to.Gas injection rate Too low or gas injection depth too depth or ocean current speed are excessive, may all cause DOW plumes to fail through density interface, so as to have not been able to Captured by density interface and rest on top layer, thus, artificial upper up-flow just fails to reach lifting deep sea water to the purpose on top layer. Therefore gas injection rate and gas injection depth how effectively to be adjusted to control the height of elevated DOW plumes, is open type airlift people One of key technology of work upper up-flow.
The theoretical research comparative maturity of surrounding water is driven on air curtain at present, but is confined to static or does not divide mostly In the water body of layer, it there is no for the research under the briny environment of flowing or different densities layering.
The content of the invention
The purpose of the present invention is in view of the shortcomings of the prior art, to propose a kind of air curtain lifting eutrophy salt deep sea water Control method.
In order to achieve the above object, the technical solution adopted in the present invention is as follows:A kind of air curtain lifting eutrophy salt is deep The control method of layer seawater, comprises the following steps:
(1) parameter acquiring of sea area condition to be measured:Surveyed using conductivity-temperature-depth system CTD, acoustic Doppler fluid velocity profile instrument ADCP Temperature, salt profile and the ocean current situation in marine site to be measured are measured, the depth H of the density stratification in marine site to be measured is obtaineds, lower layer density Value ρa1And horizontal direction ocean current speed uc
(2) air curtain track and the track of deep sea water plume are calculated:X-z-plane coordinate is set up in gas injection shower nozzle center System;Preliminary design gas injection rate Qb0, and by the depth H of density stratificationsWith horizontal direction ocean current speed ucFormula (1) and (2) is substituted into, by public affairs Formula (1) can obtain the air curtain centrode before air curtain is separated with deep sea water plume, the air curtain central track before referred to as separating Mark;Deep sea water plume centrode before air curtain is separated with deep sea water plume can be obtained by formula (2), before referred to as separating Deep sea water plume centrode;
Wherein, (x1, it is z) air curtain centrode, (x before separation2, it is z) deep sea water plume centrode before separation, CoefficientCoefficientCoefficient H0=10.4 meters, Z0For the depth where gas injection shower nozzle, α is Volume inhales coefficient, and λ is Schmidt turbulence constants, ucFor horizontal direction ocean current speed, vsFor bubble slippage speed, g accelerates for gravity Degree;
(3) air curtain up-and-down boundary track and deep sea water plume up-and-down boundary track before separation before separation are calculated:
Before separation, air curtain is identical with the width of deep sea water plume, is obtained according to width calculation formula (3):
Wherein, w is width;θ is cone angle; FrmFor revised Froude number;dnFor injection diameter, ρbFor bubble density, dNFor gas injection jet diameters;
In conjunction with formula (1) and (2), obtain separating preceding air curtain up-and-down boundary track and divide by the method for numerical computations From preceding deep sea water plume up-and-down boundary track;
(4) deep sea water plume coboundary before air curtain lower boundary track and separation before the separation obtained according to step (3) Track, obtains the burble point of air curtain lower boundary track and the preceding deep sea water plume coboundary track of separation before separation, i.e. intersection point (xd,zd);
(5) deep sea water plume centrode after separation is calculated:
Burble point (the x obtained according to step (4)d,zd), the burble point is brought into formula (4), plumage during separation is obtained Flow center speed vpm(zd):
Plume width w (z during separation are obtained according to formula (3)d):
By plume central speed v when separatingpm(zd) and separation when plume width w (zd) formula (5) is brought into, obtain Deep sea water plume centrode after separation:
Wherein,Mp0Represent the dynamic of deep sea water plume Measure flux;β(zd) for separation when plume speed and horizontal direction angle; For coefficient;Gp-BpRepresent deep sea water plume Gravitational flux GpWith buoyance flux BpDifference;ρp(zd) it is plume density when separating;
(6) separation deep sea water plume centrode peak is solved:
WhenWhen, the momentum M of deep sea water plume vertical directionpVanishing, is obtained after separation Peak (the x of deep sea water plume centrodemax,zmax),
(7) relatively and gas injection rate is adjusted:
Peak (the x of deep sea water plume centrode after the separation obtained according to step (6)max,zmax);After separating The maximum height z that deep sea water plume centrode can be reachedmaxWith the depth H of density stratificationsIt is compared;If zmax<Hs, Illustrate gas injection rate Qb0Not enough, it is necessary to improve gas injection rate Qb0;If zmax>Hs, illustrate gas injection rate Qb0Surplus, reduces gas injection rate Qb0;If zmax=HsIllustrate gas injection rate Q nowb0To lift the optimal gas injection rate of eutrophy salt deep sea water;
(8) optimal gas injection rate is tried to achieve:The step of repeat step (2)-(7), gas injection rate Q is adjusted repeatedlyb0, it is optimal until obtaining Gas injection rate.
Compared with prior art, the beneficial effects of the invention are as follows:The present invention proposes a kind of air curtain lifting eutrophy salt The control method of deep sea water, can calculate optimal gas injection rate according to the ocean current and the situation of density stratification of different waters, Make it possible to lift eutrophy salt deep sea water on density interface with lowest energy consumption, and captured by density interface, from And greatly reduce energy consumption and increase the benefit, it is that scientist carries out artificial upper up-flow, blue carbon engineering, marine ecology pasture and port The engineering projects such as mouthization ice provide help.
Brief description of the drawings
Fig. 1 is the artificial upper up-flow overall schematic of open type airlift;
In figure, Qb0For gas flow, ucFor horizontal direction ocean current speed, Z0For the depth where gas injection port, HsFor density point The depth of layer, zdFor the depth of burble point, dNFor gas injection jet diameters, zmaxFor DOW plumes centrode maximum height after separation;
Fig. 2 is gas injection rate control flow chart.
Embodiment
The present invention is described further with reference to Figure of description.
In order to be able to which by the eutrophy salt of deep sea water lifting to density interface, the present invention provides a kind of air curtain lifting The control method of eutrophy salt deep sea water, specifically includes following steps:
(1) parameter acquiring of sea area condition to be measured:Surveyed using conductivity-temperature-depth system CTD, acoustic Doppler fluid velocity profile instrument ADCP Temperature, salt profile and the ocean current situation in marine site to be measured are measured, the depth H of the density stratification in marine site to be measured is obtaineds, lower layer density Value ρa1And horizontal direction ocean current speed uc
(2) air curtain track and the track of DOW plumes are calculated:X-z-plane coordinate system is set up in gas injection shower nozzle center;Just If gas injection rate Qb0, and by the depth H of density stratificationsWith horizontal direction ocean current speed ucFormula (1) and (2) is substituted into, by formula (1) The air curtain centrode before air curtain is separated with DOW plumes, the air curtain centrode before referred to as separating can be obtained;By formula (2) the DOW plume centrodes before air curtain is separated with DOW plumes, the DOW plume centrodes before referred to as separating can be obtained;
Wherein, (x1, it is z) air curtain centrode, (x before separation2, it is z) deep sea water plume centrode before separation, CoefficientCoefficientCoefficient H0=10.4 meters, Z0For the depth where gas injection shower nozzle, α is Volume inhales coefficient, and λ is Schmidt turbulence constants, ucFor horizontal direction ocean current speed, vsFor bubble slippage speed, g accelerates for gravity Degree;
(3) air curtain up-and-down boundary track and DOW plume up-and-down boundaries track before separation before separation are calculated:
Before separation, air curtain is identical with the width of deep sea water plume, is obtained according to width calculation formula (3):
Wherein, w is width;θ is cone angle; FrmFor revised Froude number;dnFor injection diameter, ρbFor bubble density, dNFor gas injection jet diameters;
In conjunction with formula (1) and (2), obtain separating preceding air curtain up-and-down boundary track and divide by the method for numerical computations From preceding deep sea water plume up-and-down boundary track;
(4) DOW plumes coboundary track before air curtain lower boundary track and separation before the separation obtained according to step (3), Obtain the burble point of air curtain lower boundary track and the preceding DOW plumes coboundary track of separation before separation, i.e. intersection point (xd,zd);
(5) DOW plume centrodes after separation are calculated:
Burble point (the x obtained according to step (4)d,zd), the burble point is brought into formula (4), plumage during separation is obtained Flow center speed vpm(zd):
Plume width w (z during separation are obtained according to formula (3)d):
By plume central speed v when separatingpm(zd) and separation when plume width w (zd) formula (5) is brought into, obtain DOW plumes centrode after separation:
Wherein,Mp0Represent that the momentum of DOW plumes leads to Amount;β(zd) for separation when plume speed and horizontal direction angle;To be Number;Gp-BpRepresent the gravitational flux G of DOW plumesp With buoyance flux BpDifference;ρp(zd) it is plume density when separating;
(6) separation DOW plume centrode peaks are solved:
WhenWhen, the momentum M of DOW plume vertical directionspVanishing, obtains DOW plumages after separation Peak (the x of flow center trackmax,zmax),
(7) relatively and gas injection rate is adjusted:
Peak (the x of DOW plume centrodes after the separation obtained according to step (6)max,zmax);DOW plumages after separating The maximum height z that flow center track can be reachedmaxWith the depth H of density stratificationsIt is compared;If zmax<Hs, illustrate gas injection rate Qb0Not enough, it is necessary to improve gas injection rate Qb0;If zmax>Hs, illustrate gas injection rate Qb0Surplus, reduces gas injection rate Qb0;If zmax=HsExplanation Gas injection rate Q nowb0To lift the optimal gas injection rate of eutrophy salt deep sea water;
(8) optimal gas injection rate is tried to achieve:The step of repeat step (2)-(7), gas injection rate Q is adjusted repeatedlyb0, it is optimal until obtaining Gas injection rate.

Claims (1)

1. a kind of air curtain lifts the control method of eutrophy salt deep sea water, it is characterised in that this method comprises the following steps:
(1) parameter acquiring of sea area condition to be measured:Treated using conductivity-temperature-depth system CTD, acoustic Doppler fluid velocity profile instrument ADCP measurements Temperature, salt profile and the ocean current situation in marine site are surveyed, the depth H of the density stratification in marine site to be measured is obtaineds, lower layer density value ρa1 And horizontal direction ocean current speed ucParameter;
(2) air curtain track and the track of deep sea water plume are calculated:X-z-plane coordinate system is set up in gas injection shower nozzle center; Preliminary design gas injection rate Qb0, and by the depth H of density stratificationsWith horizontal direction ocean current speed ucFormula (1) and (2) is substituted into, by formula (1) the air curtain centrode before air curtain is separated with deep sea water plume, the air curtain centrode before referred to as separating can be obtained; Deep sea water plume centrode before air curtain is separated with deep sea water plume, the depth before referred to as separating can be obtained by formula (2) Layer seawater plume centrode;
AB 4 u c x 1 = 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 2 = 3 4 z 4 3 - - - ( 2 )
Wherein, (x1, it is z) air curtain centrode, (x before separation2, it is z) deep sea water plume centrode, coefficient before separationCoefficientCoefficient H0=10.4 meters, Z0For the depth where gas injection shower nozzle, α inhales for volume Coefficient, λ is Schmidt turbulence constants, ucFor horizontal direction ocean current speed, vsFor bubble slippage speed, g is acceleration of gravity;
(3) air curtain up-and-down boundary track and deep sea water plume up-and-down boundary track before separation before separation are calculated:
Before separation, air curtain is identical with the width of deep sea water plume, is obtained according to width calculation formula (3):
w = d N 2 + z &CenterDot; t a n &theta; 2 - - - ( 3 )
Wherein, w is width;θ is cone angle;Frm For revised Froude number;dnFor injection diameter, ρbFor bubble density, dNFor gas injection jet diameters;
In conjunction with formula (1) and (2), obtain separating before preceding air curtain up-and-down boundary track and separation by the method for numerical computations Deep sea water plume up-and-down boundary track;
(4) deep sea water plume coboundary track before air curtain lower boundary track and separation before the separation obtained according to step (3), Obtain the burble point of air curtain lower boundary track and the preceding deep sea water plume coboundary track of separation before separation, i.e. intersection point (xd, zd);
(5) deep sea water plume centrode after separation is calculated:
Burble point (the x obtained according to step (4)d,zd), the burble point is brought into formula (4), in plume when obtaining separation Heart speed vpm(zd):
v p m ( z d ) = &lsqb; 25 gQ b 0 H 0 ( 1 + &lambda; 2 ) 24 &alpha; 2 &pi; ( H 0 + Z 0 ) &rsqb; 1 / 3 &CenterDot; z d - 1 / 3 - - - ( 4 )
Plume width w (z during separation are 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 separatingpm(zd) and separation when plume width w (zd) formula (5) is brought into, separated Deep sea water plume centrode afterwards:
z ( x 2 ) = z d + E &lsqb; M p 0 &CenterDot; x 2 - x d u c - G p - B p 2 &CenterDot; ( x 2 - x d u c ) 2 &rsqb; - - - ( 5 )
Wherein,Mp0Represent that the momentum of deep sea water plume leads to Amount;β(zd) for separation when plume speed and horizontal direction angle;To be Number;Gp-BpRepresent the gravity of deep sea water plume Flux GpWith buoyance flux BpDifference;ρp(zd) it is plume density when separating;
(6) separation deep sea water plume centrode peak is solved:
WhenWhen, the momentum M of deep sea water plume vertical directionpVanishing, obtains deep layer after separation Peak (the x of seawater plume centrodemax,zmax),
x max = x d + M p 0 u c G p - B p
z max = z d + G p - B p 2 &CenterDot; E &CenterDot; ( x 2 - x d u c ) 2
(7) relatively and gas injection rate is adjusted:
Peak (the x of deep sea water plume centrode after the separation obtained according to step (6)max,zmax);Deep layer after separating The maximum height z that seawater plume centrode can be reachedmaxWith the depth H of density stratificationsIt is compared;If zmax<Hs, explanation Gas injection rate Qb0Not enough, it is necessary to improve gas injection rate Qb0;If zmax>Hs, illustrate gas injection rate Qb0Surplus, reduces gas injection rate Qb0;If zmax= HsIllustrate gas injection rate Q nowb0To lift the optimal gas injection rate of eutrophy salt deep sea water;
(8) optimal gas injection rate is tried to achieve:The step of repeat step (2)-(7), gas injection rate Q is adjusted repeatedlyb0, until obtaining optimal gas injection Amount.
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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CN203827876U (en) * 2014-05-20 2014-09-17 杭州电子科技大学 Thermal differential type seafloor nutritive salt lifting device
CN104472409A (en) * 2014-12-30 2015-04-01 朱祖阳 Green geo-engineering system device for regulating global climate change

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CN102138541A (en) * 2010-11-30 2011-08-03 杭州电子科技大学 Shallow sea pipeline seafloor nutrient salt gas injecting and elevating device
CN102524124A (en) * 2012-01-04 2012-07-04 浙江大学舟山海洋研究中心 Device and method for lifting shallow sea bed nutrients by air injection
CN103782935A (en) * 2014-01-10 2014-05-14 浙江大学 Adaptive-control artificial upwelling pipe
CN104026048A (en) * 2014-05-20 2014-09-10 杭州电子科技大学 Device and method for lifting seabed nutritive salt in thermal differential mode
CN203827875U (en) * 2014-05-20 2014-09-17 杭州电子科技大学 Device for lifting seabed nutritive salt based on inertial pump theory
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CN104472409A (en) * 2014-12-30 2015-04-01 朱祖阳 Green geo-engineering system device for regulating global climate change

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