CN103258085A - Method for determining quantity of sewage deep sea discharging diffuser ascension pipes - Google Patents

Abstract

The invention provides a method for determining quantity of sewage deep sea discharging diffuser ascension pipes. The method comprises the following steps of estimating the length of a main pipe of a diffuser and determining a preliminary scheme of the quantity of the ascension pipes, building a two-dimensional numerical model of a diffuser sewage discharging sea area and conducting two-dimensional numerical simulation on the diffuser ascension pipe quantity scheme, building a three-dimensional numerical model of the diffuser sewage discharging sea area and conducting three-dimensional numerical simulation on the diffuser ascension pipe quantity scheme, and analyzing diffuser numerical simulation data and determining the quantity of the ascension pipes. The method accurately determines the quantity of the ascension pipes, effectively solves the difficult problem of the quantity of the ascension pipes of the diffuser and ensures diluted diffusion effects of diffuser sewage discharging, the dilution degree in the range of kilometers to an outlet of the diffuser can be maximally hundreds of times, waste caused by too many ascension pipes is avoided, engineering cost is reduced by more than a half of conventional manufacturing cost, consumption of personnel, money and articles of follow-up diffuser research and experiments is reduced, technological support is provided for determining the length of the diffuser and the design of environment-friendly type diffusers, and foundations are established for the development of sewage deep sea discharging engineering.

Description

The method that a kind of sewage deep sea emission fan diffuser tedge quantity is determined

Technical field

The present invention relates to the method that a kind of deep sea emission fan diffuser tedge quantity is determined, be particularly useful for the tedge quantity method for designing in many standpipes structure of sewage deep sea emission fan diffuser.

Background technology

Sewage carries out the Harbor sewage disposal method that deep sea emission is a kind of environmental protection and economy, obtains coastal cities and extensively adopts.The optimal design of diffuser structure is one of gordian technique of effluent engineering of sewage construction scheme, and its organization plan mainly comprises the factors such as horizontal azimuth, flow angle and caliber of the length of fan diffuser and caliber, tedge number spacing and caliber, spout.

The diffuser structure scheme directly has influence on dilution of sewage diffusion effect and construction investment, studies each factor to the effect of dilution of sewage diffusion, and determines to arrange under the prerequisite of extra large environmental requirement reaching sewage, and reducing to invest is the main target of demanding urgently studying.At present, tedge quantity is mainly determined according to engineering experience, exist the very few environmental impact difference of the inaccurate quantity of bringing of tedge quantity and the too much serious problem of construction investment waste, determine that therefore the tedge quantity of environmental protection and economy is a problem demanding prompt solution.

Summary of the invention

At the problems referred to above, the purpose of this invention is to provide a kind of for the definite method of sewage deep sea emission fan diffuser tedge quantity, be conducive to guarantee the dilution diffusion effect of fan diffuser blowdown, length that simultaneously can more high-precision definite fan diffuser and the spacing of tedge, and provide testing program for the Area Near Diffuser physical experiments, the manpower and materials that reduced a large amount of testing programs expend, be the method for carrying out the environmental protection and economy of diffuser design, for the fan diffuser of design compliance with environmental protection requirements provides technical support and reference frame.

The technical solution used in the present invention provides a kind of sewage deep sea emission fan diffuser tedge quantity and determines method, and the step of this method comprises:

(1) fan diffuser is responsible for the estimation of length and tentatively determining of tedge quantity

Be responsible for length primary Calculation formula according to fan diffuser and determine fan diffuser person in charge length, determine tedge spacing minimum value according to the hydrostatic of Brooks, Wiullam and Agg Wakeford and the fan diffuser tedge spacing formula in the moving water, and then be responsible for the maximal value that length and tedge spacing minimum value have been determined tedge quantity according to the above-mentioned fan diffuser that obtains, thereafter according to the actual fan diffuser tedge quantity tentative programme that further proposes to have different tedge quantity of engineering;

(2) set up fan diffuser blowdown marine site two Dimension Numerical model and fan diffuser tedge quantity scheme Two-dimensional numerical simulation

Fan diffuser blowdown marine site two Dimension Numerical model, adopt hydrodynamics module and the convection current diffuse module of the MIKE2 of Denmark hydrodynamic force research institute to set up, respectively the hydrodynamic force in marine site, blowdown place and defeated the moving of pollutant are diffused into the simulation of line number value, described numerical simulation comprises that Numerical Control equation, boundary condition, computer capacity are chosen with computing grid and divides: two-dimentional hydrodynamic force numerical model and pollutant be defeated to be moved and spreads control equation of numerical simulation and comprise hydrodynamic force continuity equation, the equation of momentum, convective-diffusive equation; Boundary condition arranges starting condition, boundary condition; Grid adopts triangle irregular network, and the sewage draining exit part is encrypted; And the tidal level of logarithm value model, flow velocity and the flow direction are verified; Utilize the two Dimension Numerical model of setting up that different fan diffuser tedge quantity schemes are carried out Two-dimensional numerical simulation, obtain two-dimentional concentration distribution of pollutants and the envelope area of fan diffuser blowdown at last according to numerical simulation result;

(3) set up the simulation of fan diffuser blowdown marine site three-dimensional numerical value model and fan diffuser tedge quantity scheme three-dimensional numerical value

Fan diffuser blowdown marine site three-dimensional numerical value model, adopt hydrodynamics module and the convection current diffuse module of the MIKE3 of Denmark hydrodynamic force research institute to set up, move diffusion and simulate the hydrodynamic force in marine site, blowdown place and pollutant are defeated respectively, the realization of numerical simulation comprises that Numerical simulation equation, boundary condition, computer capacity are chosen and computing grid is divided, and three-dimensional hydrodynamic force module and convection current diffuse module governing equation comprise hydrodynamic force continuity equation, the equation of momentum, convective-diffusive equation; Boundary condition arranges starting condition, boundary condition; Grid mainly adopts triangle irregular network, and the sewage draining exit part is encrypted; And logarithm value model tidal level, flow velocity and the flow direction are verified, utilize the three-dimensional numerical value model of setting up that different fan diffuser tedge quantity schemes are carried out the three-dimensional numerical value simulation, obtain three-dimensional top layer concentration distribution of pollutants and the envelope area of fan diffuser blowdown at last according to numerical simulation;

(4) data analysis of fan diffuser numerical simulation and tedge quantity determines

Choose on the basis of fan diffuser tedge quantity tentative programme by fan diffuser person in charge's length and fan diffuser tedge minimum spacing in step (1); Two-dimensional analog and the three-dimensional simulation of the fan diffuser tedge spacing tentative programme by step (2) and step (3), obtain two-dimentional concentration distribution of pollutants and envelope area and three-dimensional concentration distribution of pollutants and the envelope area of fan diffuser blowdown, and by two and three dimensions concentration distribution of pollutants and envelope areal analysis, obtain fan diffuser and go out to flow the tedge quantity scheme that concentration of wastewater envelope area is little, high concentration region is few, determined the quantity of tedge at last.

Effect of the present invention is person in charge's caliber and the length that fan diffuser multi-port structure Design main contents have fan diffuser, tedge spacing and number, spout number and angle etc., the present invention calculates by the comprehensive formula that adopts, the method of Two-dimensional numerical simulation and three-dimensional numerical value simulation, determined the tedge quantity of fan diffuser accurately, efficiently solve the problem that fan diffuser quantity all the time is difficult to determine, guaranteed the dilution diffusion effect of fan diffuser blowdown, make the dilutability that exports in the kilometer range apart from fan diffuser reach as high as hundred times, the waste of having avoided too much tedge to cause, can reduce expense over half at most, the manpower and materials that reduced follow-up fan diffuser development test simultaneously expend, for diffuser length determine and the diffuser design of environmental protection and economy provides technical support, for the engineering development of sewage deep sea emission lays the foundation.

Description of drawings

Fig. 1 is of the present invention to determine method step figure for sewage deep sea emission fan diffuser tedge quantity;

Fig. 2 fan diffuser tedge of the present invention structural representation

Fig. 3 fan diffuser blowdown of the present invention marine site computing grid figure;

Fig. 4 fan diffuser blowdown of the present invention marine site flow field figure;

Fig. 5 a Fig. 5 b Fig. 5 c is respectively fan diffuser blowdown of the present invention marine site numerical simulation tidal level, flow velocity and flows to proof diagram;

Fig. 6 a Fig. 6 b Fig. 6 c is respectively different tedge quantity scheme Two-dimensional numerical simulation concentration profile of the present invention;

Fig. 7 a Fig. 7 b is respectively different tedge quantity scheme three-dimensional numerical value simulated concentration distribution plan of the present invention.

1, the fan diffuser person in charge 2, fan diffuser tedge

Embodiment

By reference to the accompanying drawings a kind of method of determining for sewage deep sea emission fan diffuser tedge quantity of the present invention is illustrated.

A kind of method of mainly passing through the calculating of comprehensive employing formula, Two-dimensional numerical simulation and three-dimensional numerical value simulation for the definite method of sewage deep sea emission fan diffuser tedge quantity of the present invention, the simulating pollution thing is discharged into defeated behind the marine site and moves diffusion, obtain concentration distribution of pollutants and envelope area, by concentration and environmental index analysis-by-synthesis, especially the tedge quantity of fan diffuser has been determined in the dilution analysis in top layer accurately.Fan diffuser tedge quantity is determined method such as Fig. 1, fan diffuser tedge structure such as Fig. 2.

A kind of sewage deep sea emission fan diffuser tedge quantity of the present invention is determined method, and the step of this method comprises:

(1) fan diffuser is responsible for the formula estimation of length and tentatively determining of tedge quantity

Be responsible for length primary Calculation formula according to fan diffuser and determine fan diffuser person in charge length, determine tedge spacing minimum value according to the hydrostatic of Brooks, Wiullam and Agg Wakeford and the fan diffuser tedge spacing formula in the moving water, and then be responsible for the maximal value that length and tedge spacing minimum value have been determined tedge quantity according to the above-mentioned fan diffuser that obtains, thereafter according to the actual fan diffuser tedge quantity tentative programme that further proposes to have different tedge quantity of engineering;

(2) set up fan diffuser blowdown marine site two Dimension Numerical model and fan diffuser tedge quantity scheme Two-dimensional numerical simulation

Fan diffuser blowdown marine site two Dimension Numerical model, adopt hydrodynamics module and the convection current diffuse module of the MIKE2 of Denmark hydrodynamic force research institute to set up, respectively the hydrodynamic force in marine site, blowdown place and defeated the moving of pollutant are diffused into the simulation of line number value, described numerical simulation comprises that Numerical Control equation, boundary condition, computer capacity are chosen with computing grid and divides: two-dimentional hydrodynamic force numerical model and pollutant be defeated to be moved and spreads control equation of numerical simulation and comprise hydrodynamic force continuity equation, the equation of momentum, convective-diffusive equation; Boundary condition arranges starting condition, boundary condition; Grid adopts triangle irregular network, and the sewage draining exit part is encrypted; And the tidal level of logarithm value model, flow velocity and the flow direction are verified; Utilize the two Dimension Numerical model of setting up that different fan diffuser tedge quantity schemes are carried out Two-dimensional numerical simulation, obtain two-dimentional concentration distribution of pollutants and the envelope area of fan diffuser blowdown at last according to numerical simulation result;

(3) set up the simulation of fan diffuser blowdown marine site three-dimensional numerical value model and fan diffuser tedge quantity scheme three-dimensional numerical value

Fan diffuser blowdown marine site three-dimensional numerical value model, adopt hydrodynamics module and the convection current diffuse module of the MIKE3 of Denmark hydrodynamic force research institute to set up, move diffusion and simulate the hydrodynamic force in marine site, blowdown place and pollutant are defeated respectively, the realization of numerical simulation comprises that Numerical simulation equation, boundary condition, computer capacity are chosen and computing grid is divided, and three-dimensional hydrodynamic force module and convection current diffuse module governing equation comprise hydrodynamic force continuity equation, the equation of momentum, convective-diffusive equation; Boundary condition arranges starting condition, boundary condition; Grid mainly adopts triangle irregular network, and the sewage draining exit part is encrypted; And logarithm value model tidal level, flow velocity and the flow direction are verified, utilize the three-dimensional numerical value model of setting up that different fan diffuser tedge quantity schemes are carried out the three-dimensional numerical value simulation, obtain three-dimensional top layer concentration distribution of pollutants and the envelope area of fan diffuser blowdown at last according to numerical simulation;

(4) data analysis of fan diffuser numerical simulation and tedge quantity determines

Choose on the basis of fan diffuser tedge quantity tentative programme by fan diffuser person in charge's length and fan diffuser tedge minimum spacing in step (1); Two-dimensional analog and the three-dimensional simulation of the fan diffuser tedge spacing tentative programme by step (2) and step (3), obtain two-dimentional concentration distribution of pollutants and envelope area and three-dimensional concentration distribution of pollutants and the envelope area of fan diffuser blowdown, and by two and three dimensions concentration distribution of pollutants and envelope areal analysis, obtain fan diffuser and go out to flow the tedge quantity scheme that concentration of wastewater envelope area is little, high concentration region is few, determined the quantity of tedge at last.

A kind of sewage deep sea emission fan diffuser tedge quantity of the present invention determines that method is achieved in that the step of this method comprises:

(1) fan diffuser is responsible for the estimation of 1 length and determining of tedge 2 quantity tentative programmes

This method is carried out diffuser design, a large amount of experiments and the existing achievement in research of case history according to sewage deep sea emission fan diffuser, whether the fan diffuser person in charge 1 length can satisfy blowdown requires to depend on multiple factors such as deep-sea drainage project, marine site environmental requirement, ocean current dilution capacity, especially factors such as sewage quantity, initial dilutability, the marine site depth of water and residual current play a part particularly key to the fan diffuser person in charge 1 length, and therefore can try to achieve preliminary fan diffuser according to following experimental formula is responsible for 1 length.

Fan diffuser is responsible for 1 length primary Calculation formula:

In the formula: [s]---initial dilutability;

---sewage quantity; H---the depth of water; V---residual current

According to hydrostatic and the 2 spacing formula of the fan diffuser tedge in the moving water of Brooks, Wiullam and Agg Wakeford, tedge 2 spacings should be not less than:

S=0.3H

$S=H\×[0.3+0.4\×{\left(\frac{U_a}{V_j}\right)}^{1/3}]$

In the formula: S---fan diffuser tedge 2 spacings; H---jet pipe is to the height on sea; U _a---the environment flow velocity; V _j---the spout flow velocity

Be responsible for 1 length primary Calculation formula according to fan diffuser and determine that fan diffuser is responsible for 1 length, hydrostatic and the 2 spacing formula of the fan diffuser tedge in the moving water according to Brooks, Wiullam and Agg Wakeford are determined tedge 2 spacing minimum value, and then be responsible for the maximal value that 1 length and tedge 2 spacing minimum value have been determined tedge 2 quantity according to the above-mentioned fan diffuser that obtains, thereafter according to the actual fan diffuser tedge 2 quantity tentative programmes that further propose to have different tedge 2 quantity of engineering.For example, certain embodiment has determined that by formula it is 90 meters that the fan diffuser of this embodiment is responsible for 1 preliminary length, tedge 2 minimum spacings are 3 meters, and then tedge 2 quantity of definite fan diffuser mostly are 30 most, and determine further that rule of thumb fan diffuser tedge 2 quantity tentative programmes are 10,20,30.

(2) set up fan diffuser blowdown marine site two Dimension Numerical model and fan diffuser tedge 2 quantity scheme Two-dimensional numerical simulation

Fan diffuser blowdown marine site two Dimension Numerical model mainly is to adopt hydrodynamics module and the convection current diffuse module of the MIKE2 of Denmark hydrodynamic force research institute to set up, and moves diffusion and simulates the hydrodynamic force in marine site, blowdown place and pollutant are defeated respectively.The realization of numerical simulation comprises that mainly Numerical simulation equation, boundary condition, computer capacity choose and computing grid division etc.Two dimension hydrodynamic force module and convection current diffuse module governing equation mainly comprise hydrodynamic force continuity equation, the equation of momentum, convective-diffusive equation; Boundary condition mainly arranges starting condition, boundary condition; Grid mainly adopts triangle irregular network, and the sewage draining exit part is encrypted.At last tidal level, flow velocity and the flow direction of model are verified.Wherein, two-dimentional hydrodynamic force module and convection current diffuse module governing equation are as follows, and the grid in fan diffuser marine site of living in and flow field tidal level, flow velocity, flow to proof diagram, as shown in Figure 5 as shown in Figure 3, Figure 4.Fig. 5 a is the trend size tidal level proof diagram of numerical simulation, and curve wherein is numerical simulation calculation tidal level value, and "+" is big or small tidal level measured value; Fig. 5 b is the tidal current speed proof diagram of numerical simulation, and curve wherein is the numerical simulation calculation flow speed value, and "+" is marine site flow velocity measured value; Fig. 5 c is that the trend of numerical simulation flows to proof diagram, and curve wherein is numerical simulation calculation flow direction value, and "+" flows to measured value for the marine site.

The hydrodynamic force equation:

$\frac{\∂\mathrm{\ζ}}{\∂t}+\frac{\∂p}{\∂x}+\frac{\∂q}{\∂y}=\frac{\∂d}{\∂t}$

$\frac{\&PartialD;p}{\&PartialD;t}+\frac{\&PartialD;}{\&PartialD;x}\left(\frac{p^2}{h}\right)+\frac{\&PartialD;}{\&PartialD;y}\left(\frac{\mathrm{pq}}{h}\right)+\mathrm{gh}\frac{\&PartialD;\mathrm{\&zeta;}}{\&PartialD;x}+\frac{\mathrm{<figure-callout\; id="2"\; label="gp\; p"\; filenames="HDA00003103312800012.png"\; state="\{\{state\}\}">gp</figure-callout>}\sqrt{p^{}}\sqrt{{}^2+q^2}}{C^2{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA00003103312800012.png"\; state="\{\{state\}\}">h</figure-callout>}}^2}$

$-\frac{1}{{\mathrm{\&rho;}}_w}[\frac{\&PartialD;}{\&PartialD;x}\left({\mathrm{h\&tau;}}_{\mathrm{xx}}\right)+\frac{\&PartialD;}{\&PartialD;y}\left({\mathrm{h\&tau;}}_{\mathrm{xy}}\right)]-\mathrm{\&Omega;q}-f{\mathrm{VV}}_X+\frac{h}{{\mathrm{\&rho;}}_w}\frac{\&PartialD;}{\&PartialD;x}\left(p_a\right)=0$

$\frac{\&PartialD;p}{\&PartialD;t}+\frac{\&PartialD;}{\&PartialD;y}\left(\frac{p^2}{h}\right)+\frac{\&PartialD;}{\&PartialD;x}\left(\frac{\mathrm{pq}}{h}\right)+\mathrm{gh}\frac{\&PartialD;\mathrm{\&zeta;}}{\&PartialD;y}+\frac{\mathrm{<figure-callout\; id="2"\; label="gp\; p"\; filenames="HDA00003103312800012.png"\; state="\{\{state\}\}">gp</figure-callout>}\sqrt{p^{}}\sqrt{{}^2+q^2}}{C^2{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA00003103312800012.png"\; state="\{\{state\}\}">h</figure-callout>}}^2}$

$-\frac{1}{{\mathrm{\&rho;}}_w}[\frac{\&PartialD;}{\&PartialD;y}\left({\mathrm{h\&tau;}}_{\mathrm{xx}}\right)+\frac{\&PartialD;}{\&PartialD;x}\left(h{\mathrm{\&tau;}}_{\mathrm{xy}}\right)]-\mathrm{\&Omega;q}-{\mathrm{fVV}}_y+\frac{h}{{\mathrm{\&rho;}}_w}\frac{\&PartialD;}{\&PartialD;y}\left(p_a\right)=0$

Convective-diffusive equation:

$\frac{\&PartialD;}{\&PartialD;t}\left(\mathrm{hc}\right)+\frac{\&PartialD;}{\&PartialD;x}\left(\mathrm{uhc}\right)+\frac{\&PartialD;}{\&PartialD;y}\left(\mathrm{vhc}\right)=\frac{\&PartialD;}{\&PartialD;x}(h\&CenterDot;D_x\&CenterDot;\frac{\&PartialD;c}{\&PartialD;x})+\frac{\&PartialD;}{\&PartialD;y}(h\&CenterDot;D_y\&CenterDot;\frac{\&PartialD;c}{\&PartialD;y})-F\&CenterDot;h\&CenterDot;c+s.$

The Two-dimensional numerical simulation of fan diffuser tedge 2 quantity schemes is on the basis of tedge 2 quantity tentative programmes, adopt the two Dimension Numerical model of the fan diffuser blowdown water quality impact of above-mentioned foundation, simulated the fan diffuser blowdown of different tedge 2 quantity schemes, obtained pollutant two dimension CONCENTRATION DISTRIBUTION and the envelope area of fan diffuser blowdown, and by getting rid of the tedge 2 spacing scheme optimizations that the envelope area is big, high concentration region is many.For example among the embodiment, it is 10,20,30 according to the fan diffuser tedge 2 quantity schemes of determining in the step 1, in the selective diffuser sewage effluent material of water environmental impact maximum is carried out the Two-dimensional numerical simulation of Pollutants Diffusion, its pollutant levels envelope area statistics and CONCENTRATION DISTRIBUTION see Table 1 and as shown in Figure 6.Fig. 6 a is the two-dimentional concentration distribution of pollutants figure of 10 schemes, and wherein curve represents concentration value; Fig. 6 b is the two-dimentional concentration distribution of pollutants figure of 20 schemes, and wherein curve represents concentration value; Fig. 6 c is the two-dimentional concentration distribution of pollutants figure of 30 schemes, and wherein curve represents concentration value.

The pollutant levels envelope area (m of the different tedge 2 quantity scheme Two-dimensional numerical simulation of table 1 ²)

Tedge 2 quantity	>0.005mg/L	>0.01mg/L
			10	9600	2400
20	9200	2000
			30	8400	-

(3) set up the simulation of fan diffuser blowdown marine site three-dimensional numerical value model and fan diffuser tedge 2 quantity scheme three-dimensional numerical values

Fan diffuser blowdown marine site three-dimensional numerical value model mainly is to adopt hydrodynamics module and the convection current diffuse module of the MIKE3 of Denmark hydrodynamic force research institute to set up, and moves diffusion and simulates the hydrodynamic force in marine site, blowdown place and pollutant are defeated respectively.The realization of numerical simulation comprises that mainly Numerical simulation equation, boundary condition, computer capacity choose and computing grid division etc.Three-dimensional hydrodynamic force module and convection current diffuse module governing equation mainly comprise hydrodynamic force continuity equation, the equation of momentum, convective-diffusive equation; Boundary condition mainly arranges starting condition, boundary condition; Grid mainly adopts triangle irregular network, and the sewage draining exit part is encrypted.At last tidal level, flow velocity and the flow direction of testing model are verified.Wherein, three-dimensional hydrodynamic force module and convection current diffuse module governing equation are as follows, the grid in fan diffuser marine site of living in and flow field shown in Fig. 3,4, tidal level, flow velocity, flow direction checking, as shown in Figure 5.Fig. 5 a is the trend size tidal level proof diagram of numerical simulation, and curve wherein is numerical simulation calculation tidal level value, and "+" is big or small tidal level measured value; Fig. 5 b is the tidal current speed proof diagram of numerical simulation, and curve wherein is the numerical simulation calculation flow speed value, and "+" is the flow velocity measured value; Fig. 5 c is that the trend of numerical simulation flows to proof diagram, and curve wherein is numerical simulation calculation flow direction value, and "+" flows to measured value for the marine site.

The hydrodynamic force equation:

$\frac{\&PartialD;u}{\&PartialD;x}+\frac{\&PartialD;v}{\&PartialD;y}+\frac{\&PartialD;w}{\&PartialD;\mathrm{\&sigma;}}=S$

$\frac{\&PartialD;u}{\&PartialD;t}+\frac{\&PartialD;\left(u^2\right)}{\&PartialD;x}+\frac{\&PartialD;\left(\mathrm{vu}\right)}{\&PartialD;y}+\frac{\&PartialD;\left(\mathrm{wu}\right)}{\&PartialD;\mathrm{\&sigma;}}=\mathrm{fv}-g\frac{\&PartialD;\mathrm{\&eta;}}{\&PartialD;x}-\frac{1}{{\mathrm{\&rho;}}_0}\frac{\&PartialD;p_a}{\&PartialD;x}$

$+\frac{g}{{\mathrm{\&rho;}}_0}{\&Integral;}_{\mathrm{\&sigma;}}^0\frac{\&PartialD;\mathrm{\&rho;}}{\&PartialD;x}\mathrm{dz}-\frac{1}{{\mathrm{\&rho;}}_{0}h}(\frac{{\&PartialD;s}_{\mathrm{xx}}}{\&PartialD;x}+\frac{{\&PartialD;s}_{\mathrm{yy}}}{\&PartialD;y})+F_u+\frac{\&PartialD;}{\&PartialD;\mathrm{\&sigma;}}\left(v_t\frac{\&PartialD;u}{\&PartialD;\mathrm{\&sigma;}}\right)+u_{s}S$

$\frac{\&PartialD;v}{\&PartialD;t}+\frac{\&PartialD;\left(v^2\right)}{\&PartialD;x}+\frac{\&PartialD;\left(\mathrm{uv}\right)}{\&PartialD;y}+\frac{\&PartialD;\left(\mathrm{wv}\right)}{\&PartialD;\mathrm{\&sigma;}}=-\mathrm{fu}-g\frac{\&PartialD;\mathrm{\&eta;}}{\&PartialD;y}-\frac{1}{{\mathrm{\&rho;}}_0}\frac{\&PartialD;p_a}{\&PartialD;y}$

$+\frac{g}{{\mathrm{\&rho;}}_0}{\&Integral;}_{\mathrm{\&sigma;}}^{\mathrm{\&eta;}}\frac{\&PartialD;\mathrm{\&rho;}}{\&PartialD;y}\mathrm{dz}-\frac{1}{{\mathrm{\&rho;}}_{0}h}(\frac{{\&PartialD;s}_{\mathrm{yx}}}{\&PartialD;x}+\frac{{\&PartialD;s}_{\mathrm{yy}}}{\&PartialD;y})+F_v+\frac{\&PartialD;}{\&PartialD;\mathrm{\&sigma;}}\left(v_t\frac{\&PartialD;v}{\&PartialD;\mathrm{\&sigma;}}\right)+v_{s}S$

$F_u=\frac{\&PartialD;}{\&PartialD;x}\left(2A\frac{\&PartialD;u}{\&PartialD;x}\right)+\frac{\&PartialD;}{\&PartialD;y}(A\frac{\&PartialD;u}{\&PartialD;y}+\frac{\&PartialD;v}{\&PartialD;x})$

$F_v=\frac{\&PartialD;}{\&PartialD;y}\left(2A\frac{\&PartialD;v}{\&PartialD;y}\right)+\frac{\&PartialD;}{\&PartialD;x}(A\frac{\&PartialD;u}{\&PartialD;y}+\frac{\&PartialD;v}{\&PartialD;x})$

Convective-diffusive equation:

$\frac{\&PartialD;C}{\&PartialD;t}+\frac{\&PartialD;\mathrm{uC}}{\&PartialD;x}+\frac{\&PartialD;\mathrm{vC}}{\&PartialD;y}+\frac{\&PartialD;\mathrm{wC}}{\&PartialD;\mathrm{\&sigma;}}=F_C+\frac{\&PartialD;}{\&PartialD;\mathrm{\&sigma;}}\left(D_v\frac{\&PartialD;C}{\&PartialD;\mathrm{\&sigma;}}\right)-k_{p}C+C_{s}S$

$F_C=[\frac{\&PartialD;}{\&PartialD;x}\left(D_h\frac{\&PartialD;}{\&PartialD;x}\right)+\frac{\&PartialD;}{\&PartialD;y}\left(D_h\frac{\&PartialD;}{\&PartialD;y}\right)]C.$

The three-dimensional numerical value simulation in fan diffuser tedge 2 quantity scheme blowdown marine sites mainly is that the fan diffuser scheme of two-dimensional analog analysis is further optimized, ratio choosing based on the two-dimensional mathematics model, carry out Study on Three Dimensional Numerical Simulation to choosing scheme, further study the concentration situation of its pollution of surface thing, obtained the three-dimensional top layer CONCENTRATION DISTRIBUTION of pollutant and the envelope area of fan diffuser blowdown, and by getting rid of tedge 2 quantity that top layer envelope area is big, high concentration region is many scheme has been optimized.For example among the embodiment, by the Two-dimensional numerical simulation in the step 2,10 tedge 2 schemes are not considered because high concentration region exists, and therefore follow-up is carried out the three-dimensional numerical value simulation to 20,30 tedge 2 schemes.6 σ layers of vertical branch are adopted in three-dimensional simulation, and its pollutant levels envelope area statistics and CONCENTRATION DISTRIBUTION see Table 2 and as shown in Figure 7.Fig. 7 a is the three-dimensional top layer concentration distribution of pollutants figure of 20 schemes, and wherein curve represents concentration value; Fig. 7 b is the three-dimensional top layer concentration distribution of pollutants figure of 30 schemes, and wherein curve represents concentration value.

The pollutant levels envelope area (m on the three-dimensional numerical value simulation top layer of different tedge 2 schemes of table 2 ²)

Tedge 2 quantity	>0.005mg/L	>0.01mg/L
			20	8400	1200
30	8000	-

(4) data analysis of fan diffuser numerical simulation and tedge 2 quantity determines

This step be step 1 by fan diffuser preliminary length and fan diffuser tedge 2 minimum spacings choose on the basis of fan diffuser tedge 2 quantity tentative programmes, two-dimensional analog and the three-dimensional simulation of the fan diffuser tedge 2 quantity tentative programmes by step 2 and step 3 obtain two-dimentional concentration distribution of pollutants and envelope area and three-dimensional concentration distribution of pollutants and the envelope area of fan diffuser blowdown.

Numerical simulation gained CONCENTRATION DISTRIBUTION and envelope area show, environmental impact after the fan diffuser blowdown and the tedge of fan diffuser 2 quantity have close contacting, fan diffuser tedge 2 quantity are more many, the pollutant levels in marine site are more low after the fan diffuser blowdown, the mixed zone area that exceeds standard is more little, more be conducive to the environmental protection blowdown, vice versa.This is because under the certain situation of blowdown flow rate; fan diffuser tedge 2 quantity are more many; the sewage outflow of single tedge 2 is more little; dilution effect is more good; concentration after the pollutant dilution diffusion is also just more little; but take all factors into consideration the fan diffuser investment; choosing of fan diffuser tedge 2 quantity also is limited; this shows that the mixed zone area that exceeds standard that forms after the fan diffuser blowdown is more little; the more little effect that then more is conducive to the fan diffuser blowdown of high concentration region proportion more be conducive to environmental protection, otherwise dilution effect is poor after the fan diffuser blowdown; environmental impact is bigger, does not recommend to adopt.Therefore, by two and three dimensions simulating pollution concentration profile and envelope areal analysis, obtain fan diffuser and go out to flow the tedge 2 quantity schemes that concentration of wastewater envelope area is little, high concentration region is few, determined tedge 2 quantity at last.

Embodiment for example, by above-mentioned research, choose 10,20,30 tedge 2 quantity schemes at last according to the fan diffuser person in charge's 1 preliminary length and fan diffuser tedge 2 minimum spacings in the step 1, by the Two-dimensional numerical simulation of the fan diffuser tedge 2 quantity tentative programme water environmental impacts in the step 2, the scheme of 10 tedges 2 of discovery surpasses two classes and three class mixed zone areas are 9600m ²And 2400m ², 20 the 9200m that is that surpasses two classes and three classes ²And 2000m ²30 surpass two class 8400m ²Do not surpass three class zones, owing to exceeding standard the mixed zone area after 10 the scheme blowdown greatly and having high concentration region, and the actual existence that should avoid high concentration region, therefore the scheme of getting rid of 10 tedges 2, the simulation of follow-up three-dimensional numerical value only needs 20 and 30 s' scheme is studied, and analyzes discovery, and the area that the top layer of 20 tedge 2 schemes surpasses two classes and three class water quality standard is 8400m ²And 1200m ², exist the zonule to surpass the zone of the initial dilute concentration 0.083mg/l in top layer, the area that the top layer of 30 tedge 2 schemes surpasses two class water quality standard is 8000m ²Do not exist and surpass three class zones, also do not surpass the zone of initial dilute concentration, this shows that 30 schemes can better meet the demands, but in view of the more big factor of the more many investments of tedge 2 quantity, though the initial dilution in scheme top layer of considering 20 simultaneously slightly exceeds standard, because actual top layer dilution effect also is subjected to the influence of fan diffuser blowdown near region bouyant jet, specifically whether satisfies environmental requirement, also need to verify by physical experiments, therefore, determine that at last tedge 2 quantity are 20.

Claims (1)

1. a sewage deep sea emission fan diffuser tedge quantity is determined method, and the step of this method comprises:

(1) fan diffuser is responsible for the estimation of length and tentatively determining of tedge quantity

Be responsible for length primary Calculation formula according to fan diffuser and determine fan diffuser person in charge length, determine tedge spacing minimum value according to the hydrostatic of Brooks, Wiullam and Agg Wakeford and the fan diffuser tedge spacing formula in the moving water, and then be responsible for the maximal value that length and tedge spacing minimum value have been determined tedge quantity according to the above-mentioned fan diffuser that obtains, thereafter according to the actual fan diffuser tedge quantity tentative programme that further proposes to have different tedge quantity of engineering;

(2) set up fan diffuser blowdown marine site two Dimension Numerical model and fan diffuser tedge quantity scheme Two-dimensional numerical simulation

Fan diffuser blowdown marine site two Dimension Numerical model, adopt hydrodynamics module and the convection current diffuse module of the MIKE2 of Denmark hydrodynamic force research institute to set up, respectively the hydrodynamic force in marine site, blowdown place and defeated the moving of pollutant are diffused into the simulation of line number value, described numerical simulation comprises that Numerical Control equation, boundary condition, computer capacity are chosen with computing grid and divides: two-dimentional hydrodynamic force numerical model and pollutant be defeated to be moved and spreads control equation of numerical simulation and comprise hydrodynamic force continuity equation, the equation of momentum, convective-diffusive equation; Boundary condition arranges starting condition, boundary condition; Grid adopts triangle irregular network, and the sewage draining exit part is encrypted; And the tidal level of logarithm value model, flow velocity and the flow direction are verified; Utilize the two Dimension Numerical model of setting up that different fan diffuser tedge quantity schemes are carried out Two-dimensional numerical simulation, obtain two-dimentional concentration distribution of pollutants and the envelope area of fan diffuser blowdown at last according to numerical simulation result;

(3) set up the simulation of fan diffuser blowdown marine site three-dimensional numerical value model and fan diffuser tedge quantity scheme three-dimensional numerical value

Fan diffuser blowdown marine site three-dimensional numerical value model, adopt hydrodynamics module and the convection current diffuse module of the MIKE3 of Denmark hydrodynamic force research institute to set up, move diffusion and simulate the hydrodynamic force in marine site, blowdown place and pollutant are defeated respectively, the realization of numerical simulation comprises that Numerical simulation equation, boundary condition, computer capacity are chosen and computing grid is divided, and three-dimensional hydrodynamic force module and convection current diffuse module governing equation comprise hydrodynamic force continuity equation, the equation of momentum, convective-diffusive equation; Boundary condition arranges starting condition, boundary condition; Grid mainly adopts triangle irregular network, and the sewage draining exit part is encrypted; And logarithm value model tidal level, flow velocity and the flow direction are verified, utilize the three-dimensional numerical value model of setting up that different fan diffuser tedge quantity schemes are carried out the three-dimensional numerical value simulation, obtain three-dimensional top layer concentration distribution of pollutants and the envelope area of fan diffuser blowdown at last according to numerical simulation;

(4) data analysis of fan diffuser numerical simulation and tedge quantity determines

Choose on the basis of fan diffuser tedge quantity tentative programme by fan diffuser person in charge's length and fan diffuser tedge minimum spacing in step (1); Two-dimensional analog and the three-dimensional simulation of the fan diffuser tedge spacing tentative programme by step (2) and step (3), obtain two-dimentional concentration distribution of pollutants and envelope area and three-dimensional concentration distribution of pollutants and the envelope area of fan diffuser blowdown, and by two and three dimensions concentration distribution of pollutants and envelope areal analysis, obtain fan diffuser and go out to flow the tedge quantity scheme that concentration of wastewater envelope area is little, high concentration region is few, determined the quantity of tedge at last.

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