CN204529482U - Launch the jet aerator of turn type jet - Google Patents

Abstract

The utility model provides a kind of jet aerator launching turn type jet, and it comprises: suction chamber, and the top of described suction chamber is provided with injection medium entrance, and the both sides sidewall that described suction chamber is relative is provided with import and outlet; Spray chamber, described spray chamber is communicated with described suction chamber, the import of the import of described spray chamber, nozzle and described suction chamber, exports coaxial, and described nozzle points to the outlet of described suction chamber, the ingress of described spray chamber is provided with rotational flow generator, to produce turn type jet; Hybrid chamber, the outlet of described hybrid chamber and described suction chamber, and the import of described hybrid chamber, outlet and the import of described suction chamber, export coaxial; Diffuser tube, the outlet of described diffuser tube and described hybrid chamber, and the import of described diffuser tube, outlet and the import of described hybrid chamber, export coaxial.The jet aerator launching turn type jet adds jet less turbulence and entrainments ability, thus improves dynamic efficiency and the coefficient of oxygen utilization of jet aerator.

Description

Launch the jet aerator of turn type jet

Technical field

The utility model relates to jet aerator, specifically, relates to a kind of jet aerator launching turn type jet.

Background technology

In biochemical wastewater treatment, sewage aeration must be allowed, for the oxygen that oxidizing is decomposed dirty Organic substance in water and maintained needed for microbial life activity.Wherein, jet-flow aeration method occupies an important position in biochemical wastewater treatment with its higher dynamic efficiency and coefficient of oxygen utilization.

Jet-flow aeration utilizes high-speed water jet to make sewage oxygenation to the suction function of air, and the powerful turbulence formed after utilizing jet and air mixed is to reach mixing wastewater with air.Because jet-flow aeration has oxygenation capacity by force, coefficient of oxygen utilization high (blast aeration is generally 6 ~ 10%, and jet-flow aeration is generally 30 ~ 50%), thus power consumption is economized, and the advantages such as working cost is low, occupy critical role in biochemical wastewater treatment.

Jet aerator is the conveying equipment for fluid substances that collection mixes, reacts, is absorbed in one as a kind of fluid machinery, by momentum, energy, the mass transfer of high-speed jet, aspirates and compress gas.Jet aerator is primarily of parts compositions such as nozzle, suction chamber, mixing section and diffuser tubes.Fluid through nozzle injection is called working medium, working medium is to flow out from nozzle at a high speed, enter suction chamber, gas outside suction chamber is entrainmented into suction chamber, the gas be inhaled into is called injection medium, working medium with together with the injection medium that entrainments, enter mixing section, air-water mixture experienced by mixing wastewater with air in mixing section, finally becomes emulsus air water two-phase mixture to flow into sewage from diffuser tube.Emulsus air-water mixture is in sewage, and gas phase dispersion enters liquid phase, has carried out mass transfer at gas-liquid surface, transfers in sewage by the oxygen in air, achieves the biochemical treatment of sewage.Can the pattern of jet aerator improve one of the dynamic efficiency of jet-flow aeration system and the key part of coefficient of oxygen utilization, and how improve further existing jet aerator oxygen transfer mass, to be transferred in sewage by the oxygen in air be a problem demanding prompt solution.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of jet aerator launching turn type jet, rotational flow generator will make working fluid be that precession swirling flows out along conical nozzle, form high-speed rotary ejector half jet to penetrate from nozzle, effectively increase the less turbulence of jet and entrainment ability, improve the unit time oxygen transfer amount of jet-flow aeration process, thus improve dynamic efficiency and the coefficient of oxygen utilization of jet aerator.

For achieving the above object, the utility model provides a kind of jet aerator launching turn type jet, and it comprises: suction chamber, and the top of described suction chamber is provided with injection medium entrance, and the both sides sidewall that described suction chamber is relative is provided with import and outlet; Spray chamber, described spray chamber is communicated with described suction chamber, the import of the import of described spray chamber, nozzle and described suction chamber, exports coaxial, and described nozzle points to the outlet of described suction chamber, the ingress of described spray chamber is provided with rotational flow generator, to produce turn type jet; Hybrid chamber, the outlet of described hybrid chamber and described suction chamber, and the import of described hybrid chamber, outlet and the import of described suction chamber, export coaxial; Diffuser tube, the outlet of described diffuser tube and described hybrid chamber, and the import of described diffuser tube, outlet and the import of described hybrid chamber, export coaxial.

Preferably, described rotational flow generator comprises at least one helical layer blade.

Preferably, the turn intensity of the turn type jet that described rotational flow generator produces equals the tangential flow velocity of turn type jet that penetrates from described nozzle and the ratio of axial flow velocity, the turn intensity of the turn type jet that described rotational flow generator produces represents with turn number S, according to following formulae discovery turn intensity:

$S=\frac{w}{u}---\left(1\right)$

In formula, w represents the tangential flow velocity of turn type jet;

U represents the axial flow velocity of turn type jet;

Tangential flow velocity and the following algebraic equation of axial flow velocity of turn type jet represent:

$\frac{u_m\left(x\right)}{u_0}=K_1\frac{d}{x+a}{f_1}^{1/2}---\left(2\right)$

$\frac{w_m\left(x\right)}{w_0}=K_2{{\left(\frac{d}{x+a}\right)}^2{f}_1}^{-1/2}---\left(3\right)$

In formula, u _mfor axial flow velocity is in the maximum value at axis place;

U ₀for turn type jet is in the axial velocity of nozzle exit;

W _mfor tangential flow velocity is in the maximum value at axis place;

W ₀for turn type jet is in the tangential velocity of nozzle exit;

D is the diameter of nozzle;

A is the length of nozzle;

k ₁it is the function of turn number S;

k ₂have nothing to do with turn number S;

F ₁and f ₂be the function of turn number S, wherein:

$f_1=[1-N^2+\sqrt{(1-N^2)+{\left(\frac{2N{K}_{1}d}{x+a}\right)}^2}]/2---\left(4\right)$

$f_2=[1-N^2+\sqrt{(1-N^2)+{\left(\frac{2\mathrm{Na}}{x+a}\right)}^2}]/2---\left(5\right)$

$N=\frac{w_0}{u_0}H\left(S\right)---\left(6\right)$

H＝-0.94559S+1.327715 (7)

Preferably, ability of entrainmenting and the turn intensity of the turn type jet that described rotational flow generator produces are proportional, and the relation of the two is:

$\frac{{\stackrel{\·}{m}}_s}{{\stackrel{\·}{m}}_0}=(k_0+k_{s}S)\frac{x}{d}---\left(8\right)$

In formula: for x point place is by the mass rate of injection medium of entrainmenting in jet;

for the mass rate of nozzle exit;

X is take jet exit as the jet axial distance of starting point;

D is nozzle diameter;

K ₀and k _sfor constant, wherein, k ₀=0.32 and k _s=0.8.

Preferably, spread angle and the turn intensity of the turn type jet that described rotational flow generator produces are proportional, and the relation of the two is:

θ＝4.8+14S (9)

In formula: θ is the spread angle of jet, the angle namely between jet axial sectional edge line, wherein θ=7.60 ° ~ 10.96 °.

Preferably, the optimum value of turn number S is 0.416.

In addition, preferably, described injection medium is the gas containing oxygen; The working medium of described spray chamber is liquid.

From above-mentioned description with put into practice, the jet aerator of the transmitting turn type jet that the utility model provides, its beneficial effect is: the spray chamber adding rotational flow generator can make working medium produce motion track change, precession whirlpool is produced in nozzle cone region, and form turn type jet at nozzle exit, that improves jet aerator entrainments ability, the ability of entrainmenting of turn type jet increases with the increase of turn number, the increase of the ability of entrainmenting with jet increases by the air imbibed quantity of jet aerator, therefore go out the air-water mixture of stream from jet aerator, the amount of gas phase will increase, thus add the mass transfer area at gas-liquid two-phase interface, mass transfer coefficient also will increase thereupon, improve the unit time oxygen transfer amount of jet-flow aeration process, thus improve dynamic efficiency and the coefficient of oxygen utilization of jet aerator.

Accompanying drawing explanation

By below in conjunction with the description of accompanying drawing to embodiment, above-mentioned characteristic sum technological merit of the present utility model will become apparent and easy understand.In the accompanying drawings,

Fig. 1 is the schematic diagram of the jet aerator of transmitting turn type jet described in the utility model embodiment;

Fig. 2 is the spray regime schematic diagram of the jet aerator of the transmitting turn type jet shown in Fig. 1;

Fig. 3 is the spray regime schematic diagram of conventional jet aerator in prior art.

Reference numeral:

Launch the jet aerator 100 of turn type jet:

1: suction chamber; 11: injection medium entrance; 12: import; 13: outlet;

2: spray chamber; 21: import; 22: nozzle; 23: rotational flow generator;

3: hybrid chamber; 31: import; 32: outlet;

4: diffuser tube; 41: import; 42: outlet;

2': spray chamber.

Embodiment

For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, are described in further detail the utility model below in conjunction with the drawings and specific embodiments.

Fig. 1 is the schematic diagram of the jet aerator of transmitting turn type jet described in the utility model embodiment.As shown in Figure 1, the jet aerator 100 launching turn type jet comprises suction chamber 1, spray chamber 2, hybrid chamber 3 and diffuser tube 4.

The top of suction chamber 1 offers injection medium entrance 11, injection medium enters in suction chamber 1 from this import, the both sides sidewall that suction chamber 1 is relative is provided with import 12 and the outlet 13 of working medium, and coaxially, import 12 and outlet 13 are about rotational symmetry for import 12 and outlet 13.Injection medium is the gas containing oxygen, such as air.

Spray chamber 2 is communicated with suction chamber 1, and spray chamber 2 is for spraying working medium, and the working medium that spray chamber 2 sprays is liquid, such as water.The entrance end of spray chamber 2 is fixed on import 12 place of suction chamber 1, the body of spray chamber 2 is positioned at suction chamber 1, the import 12 of the import 21 of spray chamber 2, nozzle 22 and suction chamber 1, export 13 coaxial, and spray chamber 2 is axially symmetric structures, and nozzle 22 points to the outlet 13 of suction chamber 1.Import 21 place of spray chamber 2 is provided with rotational flow generator 23, and preferably, rotational flow generator 23 comprises at least one helical layer blade.Through rotational flow generator 23, the motion track of working medium changes, and to form turn type jet, thus increases the less turbulence of jet and entrainments ability.

The import 31 of hybrid chamber 3 is communicated with the outlet 13 of suction chamber 1, hybrid chamber 3 for mixing injection medium and working medium, the import 31 of hybrid chamber 3, outlet 32 about rotational symmetry, the import 12 of the import 31 of hybrid chamber 3, outlet 32 and suction chamber 1, export 13 coaxial.

The import 41 of diffuser tube 4 is communicated with the outlet 32 of hybrid chamber 3, import 41 diameter of diffuser tube 4 is less than it and exports 42 diameters, mixed injection medium and working medium spray from the outlet 42 of diffuser tube 4, the import 41 of diffuser tube 4, outlet 42 about rotational symmetry, the import 31 of the import 41 of diffuser tube 4, outlet 42 and hybrid chamber 3, export 32 coaxial.

Rotational flow generator 23 is installed on the front end of aerator nozzle 22, working fluid will should be made to be that precession swirling flows out along conical nozzle with the rotational flow generator 23 of screw-blade, form high-speed rotary ejector half jet to penetrate from nozzle 22, effectively add the turbulence degree of jet and entrainment ability, strong turbulence is formed at the suction chamber 1 of aerator, Air Entrainment is entered in turn type jet, enter the hybrid chamber 3 of aerator together, due to powerful turbulence in hybrid chamber 3, air is fully mixed with water, air is cut into countless small bubbles, two-phase mixtures fluid flows out the jet aerator launching turn type jet with emulsus state, enter in sewage.

Fig. 2 is the spray regime schematic diagram of the jet aerator of the transmitting turn type jet shown in Fig. 1.Fig. 3 is the spray regime schematic diagram of conventional jet aerator in prior art.Known by Fig. 2 and Fig. 3, in fig. 2, after increasing rotational flow generator 23, working fluid not only comprises horizontal direction speed and vertical direction speed at the jet that nozzle penetrates, and also comprises tangential velocity.In figure 3, spray chamber 2' does not increase any equipment, and working fluid only comprises horizontal direction speed and vertical direction speed at the jet that nozzle penetrates, and there is not tangential velocity.In fig. 2, rotational flow generator 23 is installed on the front end of spray chamber 2 nozzle, it makes the working fluid of the import 21 of spray chamber 2 produce precession whirlpool at the conical region of nozzle 22, and spray from nozzle 22 at nozzle 22 exit formation turn type jet, effectively add the turbulence degree of jet and entrainment ability, greatly improving dynamic efficiency and the coefficient of oxygen utilization of jet aerator.

Prove that the performance of the jet aerator with turn type jet gets a promotion below further according to the angle of theoretical investigation.Two-film theory thinks the mass transfer process that the water-soluble process of gas is made up of four-stage.First stage gas is passed to gas-liquid interface by gas phase, and subordinate phase gas is by the air film of gas side, interface, and the phase III, last fourth stage gas was diffused in whole solution by the liquid film of liquid side, interface.Two-film theory thinks that gas is when to liquid mass transfer, and the resistance through liquid-gas interface mainly comes from the liquid film of liquid side.Research shows, the Main Means affecting total oxygen transfer coefficient has two, and one is reduce thickness of liquid film, and another is then the mass transfer area increasing unit volume solution interface.

Fig. 2 is the spray regime schematic diagram of the jet aerator of the transmitting turn type jet shown in Fig. 1.Fig. 3 is the spray regime schematic diagram of conventional jet aerator in prior art.As shown in Figure 2, compared with common jet, turn type jet of the present utility model is a many tangential flow velocity w, the turn intensity of turn type jet that rotational flow generator 23 produces equals the tangential flow velocity w of turn type jet that penetrates from nozzle 22 and the ratio of axial flow velocity u, and in figure 3, owing to there is not tangential flow velocity w, then there is not turn intensity, namely turn number is zero.And the turn intensity of the turn type jet that the rotational flow generator 23 shown in Fig. 2 produces represents with turn number S,

According to following formulae discovery turn intensity:

$S=\frac{w}{u}---\left(1\right)$

In formula, w represents the tangential flow velocity of turn type jet;

U represents the axial flow velocity of turn type jet;

Tangential flow velocity and the following algebraic equation of axial flow velocity of turn type jet represent:

$\frac{u_m\left(x\right)}{u_0}=K_1\frac{d}{x+a}{f_1}^{1/2}---\left(2\right)$

$\frac{w_m\left(x\right)}{w_0}=K_2{{\left(\frac{d}{x+a}\right)}^2{f}_1}^{-1/2}---\left(3\right)$

In formula, u _mfor axial flow velocity is in the maximum value at axis place;

U ₀for turn type jet is in the axial velocity of nozzle exit;

W _mfor tangential flow velocity is in the maximum value at axis place;

W ₀for turn type jet is in the tangential velocity of nozzle exit;

D is the diameter of nozzle;

A is the length of nozzle;

k ₁it is the function of turn number S;

k ₂have nothing to do with turn number S;

F ₁and f ₂be the function of turn number S, wherein:

$f_1=[1-N^2+\sqrt{(1-N^2)+{\left(\frac{2N{K}_{1}d}{x+a}\right)}^2}]/2---\left(4\right)$

$f_2=[1-N^2+\sqrt{(1-N^2)+{\left(\frac{2\mathrm{Na}}{x+a}\right)}^2}]/2---\left(5\right)$

$N=\frac{w_0}{u_0}H\left(S\right)---\left(6\right)$

H＝-0.94559S+1.327715 (7)

Ability of entrainmenting and the turn intensity of the turn type jet that rotational flow generator 23 produces are proportional, and the relation of the two is:

$\frac{{\stackrel{\·}{m}}_s}{{\stackrel{\·}{m}}_0}=(k_0+k_{s}S)\frac{x}{d}---\left(8\right)$

In formula: for x point place is by the mass rate of injection medium of entrainmenting in jet;

for the mass rate of nozzle exit;

X is take jet exit as the jet axial distance of starting point;

D is nozzle diameter;

K ₀and k _sfor constant, wherein, k ₀=0.32 and k _s=0.8.

From formula (8), the ability of entrainmenting of jet increases with the increase of turn number S.

Spread angle and the turn intensity of the turn type jet that rotational flow generator 23 produces are proportional, and the relation of the two is:

θ＝4.8+14S (9)

In formula: θ is the spread angle of jet, the angle namely between jet axial sectional edge line, wherein θ=7.60 ° ~ 10.96 °.

From formula (9), along with the increase of turn number S, the spread angle θ of jet also increases thereupon, but the axial flow velocity u of jet will decay thereupon, and this will be unfavorable for the optimization of device geometry.Experiment shows, generally gets S=0.416 and is advisable.

According to the angle value of spread angle, the turn number representing turn intensity can be obtained, ability of entrainmenting and the turn intensity of the turn type jet that rotational flow generator 23 produces are proportional, and therefore, that can compare the jet aerator of launching turn type jet and conventional jet aerator entrainments ability.

When θ=7.60 °, can be obtained by formula (9), S=0.2, now, k ₀=0.32, k _s=0.8, can be obtained by formula (8), launch the jet aerator of turn type jet ${\stackrel{\·}{m}}_s/{\stackrel{\·}{m}}_0=(0.32+0.8\×0.2)x/d=0.48x/d;$ And common jet aerator, due to S=0, then the ratio of the two is 1.5, and the ability of entrainmenting of namely launching the turn type jet of the jet aerator of turn type jet is 1.5 times of the ability of entrainmenting of common jet aerator.

When θ=10.96 °, can be obtained by formula (9), S=0.44, now, k ₀=0.32, k _s=0.8, can be obtained by formula (8), launch the jet aerator of turn type jet ${\stackrel{\·}{m}}_s/{\stackrel{\·}{m}}_0=(0.32+0.8\×0.44)x/d=0.672x/d;$ And common jet aerator, due to S=0, then the ratio of the two is 2.1, and the ability of entrainmenting of namely launching the turn type jet of the jet aerator of turn type jet is 2.1 times of the ability of entrainmenting of common jet aerator.

Work as S=0.416, k ₀=0.32, k _s=0.8, can be obtained by formula (8), launch the jet aerator of turn type jet ${\stackrel{\·}{m}}_s/{\stackrel{\·}{m}}_s=(0.32+0.8\×0.44)x/d=0.6528x/d;$ And common jet aerator, due to S=0, then the ratio of the two is 2.04, and the ability of entrainmenting of namely launching the turn type jet of the jet aerator of turn type jet is 2.04 times of the ability of entrainmenting of common jet aerator.

Above-mentioned calculating shows, the jet aerator of turn type jet of the present utility model, and its ability of entrainmenting is 1.5 ~ 2.1 times of the ability of entrainmenting of the jet aerator of tradition application.

The embodiment provided by above-mentioned the utility model launches the jet aerator of turn type jet, its beneficial effect is: the spray chamber adding rotational flow generator can make working medium produce motion track change, precession whirlpool is produced in nozzle cone region, and form turn type jet at nozzle exit, that improves jet aerator entrainments ability, the ability of entrainmenting of turn type jet increases with the increase of turn number, the increase of the ability of entrainmenting with jet increases by the air imbibed quantity of jet aerator, therefore go out the air-water mixture of stream from jet aerator, the amount of gas phase will increase, thus add the mass transfer area at gas-liquid two-phase interface, mass transfer coefficient also will increase thereupon, improve the unit time oxygen transfer amount of jet-flow aeration process, thus improve dynamic efficiency and the coefficient of oxygen utilization of jet aerator.

The above; be only the utility model preferably embodiment; but protection domain of the present utility model is not limited thereto; any people being familiar with this technology is in the technical scope disclosed by the utility model; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.

Claims (7)

1. launch a jet aerator for turn type jet, it is characterized in that, it comprises:

Suction chamber, the top of described suction chamber is provided with injection medium entrance, and the both sides sidewall that described suction chamber is relative is provided with import and outlet;

Spray chamber, described spray chamber is communicated with described suction chamber, the import of the import of described spray chamber, nozzle and described suction chamber, exports coaxial, and described nozzle points to the outlet of described suction chamber, the ingress of described spray chamber is provided with rotational flow generator, to produce turn type jet;

Hybrid chamber, the outlet of described hybrid chamber and described suction chamber, and the import of described hybrid chamber, outlet and the import of described suction chamber, export coaxial;

Diffuser tube, the outlet of described diffuser tube and described hybrid chamber, and the import of described diffuser tube, outlet and the import of described hybrid chamber, export coaxial.

2. the jet aerator launching turn type jet as claimed in claim 1, it is characterized in that, described rotational flow generator comprises at least one helical layer blade.

3. the jet aerator launching turn type jet as claimed in claim 1 or 2, it is characterized in that, the turn intensity of the turn type jet that described rotational flow generator produces equals the tangential flow velocity of turn type jet that penetrates from described nozzle and the ratio of axial flow velocity, the turn intensity of the turn type jet that described rotational flow generator produces represents with turn number S, according to following formulae discovery turn intensity:

$S=\frac{w}{u}$

In formula, w represents the tangential flow velocity of turn type jet;

U represents the axial flow velocity of turn type jet;

Tangential flow velocity and the following algebraic equation of axial flow velocity of turn type jet represent:

$\frac{u_m\left(x\right)}{u_0}=K_1\frac{d}{x+a}{f}_1^{1/2}$

$\frac{w_m\left(x\right)}{w_0}=K_2{\left(\frac{d}{x+a}\right)}^2{f}_2^{-1/2}$

In formula, u _mfor axial flow velocity is in the maximum value at axis place;

U ₀for turn type jet is in the axial velocity of nozzle exit;

W _mfor tangential flow velocity is in the maximum value at axis place;

W ₀for turn type jet is in the tangential velocity of nozzle exit;

D is the diameter of nozzle;

A is the length of nozzle;

k ₁it is the function of turn number S;

k ₂have nothing to do with turn number S;

F ₁and f ₂be the function of turn number S, wherein:

$f_1=[1-N^2+\sqrt{(1-N^2)+{\left(\frac{{2\mathrm{NK}}_{1}d}{x+a}\right)}^2}]/2$

$f_2=[1-N^2+\sqrt{(1-N^2)+{\left(\frac{2Na}{x+a}\right)}^2}]/2$

$N=\frac{w_0}{u_0}H\left(S\right)$

H＝-0.94559S+1.327715。

4. the jet aerator launching turn type jet as claimed in claim 3, it is characterized in that, ability of entrainmenting and the turn intensity of the turn type jet that described rotational flow generator produces are proportional, and the relation of the two is:

$\frac{{\stackrel{\·}{m}}_s}{{\stackrel{\·}{m}}_0}=(k_0+k_{s}S)\frac{x}{d}$

In formula: for x point place is by the mass rate of injection medium of entrainmenting in jet;

for the mass rate of nozzle exit;

X is take jet exit as the jet axial distance of starting point;

D is nozzle diameter;

K ₀and k _sfor constant, wherein, k ₀=0.32 and k _s=0.8.

5. the jet aerator launching turn type jet as claimed in claim 3, it is characterized in that, spread angle and the turn intensity of the turn type jet that described rotational flow generator produces are proportional, and the relation of the two is:

θ＝4.8+14S

In formula: θ is the spread angle of jet, the angle namely between jet axial sectional edge line, wherein θ=7.60 ° ~ 10.96 °.

6. the jet aerator launching turn type jet as claimed in claim 3, it is characterized in that, the optimum value of turn number S is 0.416.

7. the jet aerator launching turn type jet as claimed in claim 1, it is characterized in that, described injection medium is the gas containing oxygen; The working medium of described spray chamber is liquid.