CN115231656A - Water distribution method with multiple flow rates and high adaptability - Google Patents
Water distribution method with multiple flow rates and high adaptability Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/006—Water distributors either inside a treatment tank or directing the water to several treatment tanks; Water treatment plants incorporating these distributors, with or without chemical or biological tanks
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- G06F30/00—Computer-aided design [CAD]
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Abstract
The invention provides a water distribution method with multiple flow rates and high adaptability, and the comparative water distribution method comprises the following steps: 1) Dyeing tracing uniformity simulation: the method comprises the following steps of dividing a numerical calculation model, a geometric model and a grid, setting simulation parameters, comparing experiments with simulation qualitatively and comparing experiments with simulation quantitatively; 2) Analyzing the simulation result of the all-condition: the method comprises the following steps of (1) analyzing and comparing a porous medium flow model, a uniformity index, a geometric model and grid division, simulation parameter setting and simulation results; the uniformity of the baffle-porous plate type and the uniformity of the branch and mother pipe type are compared under different flow velocities, the degree of reduction of the baffle-porous plate type uniformity index is lower than that of the branch and mother pipe type along with the increase of the flow velocity, the influence rule of the different flow velocities on the flow field of the mixed bed is analyzed, the simulation correctness and reliability are verified through comparison with a simulation result, the water distribution uniformity of the branch and mother pipe water distribution structure and the baffle-porous plate structure is analyzed through full-working-condition simulation comparison, and the high-uniformity water distribution device is optimally designed.
Description
Technical Field
The invention relates to the field of water replenishing of ion exchangers, in particular to a water distribution method with multiple flow rates and high adaptability.
Background
The ion exchanger is mainly used for preparing pure water and high-purity water, and has been widely applied in various industrial fields such as medium-high pressure boiler water supply and the like. The design of ion exchange equipment with reasonable structure directly relates to the periodic water production quantity and the effluent quality of the ion exchanger. The internal structure of the ion exchanger, particularly the water distribution device, relates to the distribution of the flow field and the water distribution in the whole module, and ideally, the water to be treated is uniformly distributed downwards in the module, so that the synchronous failure of the resin on each section in the resin tank is ensured, the resin layer is stable and undisturbed, and the flow resistance is small.
The influence rule of different flow velocities on the flow field of the mixed bed is analyzed by comprehensively analyzing and comparing the uniformity index, manufacturability and advantages and disadvantages of various design structures through different branch and mother pipe structures, branch and mother pipe-porous plate mechanisms, branch and mother pipe-porous plate-foamed nickel structures, octopus-porous plate structures, baffle-porous plate structures and circumferential hole-porous plate structures on the market, so that how to optimize the structure of the water distribution device of the ion exchanger becomes a key research direction.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a water distribution method with multiple flow rates and high adaptability to solve the problems in the background art, the water distribution method is novel in structure, the influence rule of different flow rates on the flow field of a mixed bed is analyzed, the simulation accuracy and reliability are verified by comparing with a simulation result, the water distribution uniformity of a branch and main pipe water distribution structure and a baffle-porous plate structure is analyzed by full-working-condition simulation comparison, and a high-uniformity water distribution device is optimally designed.
In order to achieve the purpose, the invention is realized by the following technical scheme: a water distribution method with multiple flow rates and high adaptability comprises the following steps:
1) Simulating dyeing tracing uniformity;
a numerical calculation model;
geometric model and mesh division: establish 1 by SOLIDWORKS: 1, establishing a fluid region branch and mother pipe model, namely establishing a flow path of 1:1, a fluid region baffle-porous plate model, wherein the grid division adopts free tetrahedral grid division, and the middle uniform part of a resin tank adopts a sweeping mode to establish a grid;
setting simulation parameters: the fluid medium used for the mold is water.
Qualitative comparison of experiments and simulations: the simulated interface diagram and the experimental diagram of the branch-and-mother pipe type water distribution device at the flow rate of 20.23m/h and the flow rate of 37.54 m/h are compared with the simulated interface diagram and the experimental diagram of the baffle-porous plate type water distribution device.
Experimental and simulated quantitative comparisons: and adopting MATLAB software to grab a rectangular area above the porous medium surface in the experimental video, carrying out partition calculation according to a mixedness calculation formula, wherein MI is a mixing index, MI =0 represents a non-mixing condition, MI =1 represents complete uniform mixing, exporting the three-dimensional concentration in the simulation into an animation format, and carrying out mixedness calculation through the MATLAB.
2) Analyzing the simulation result of the all-condition;
a porous medium flow pattern;
an index of homogeneity;
dividing a geometric model and a grid;
setting simulation parameters: the porosity and permeability parameters are required to be determined in a porous medium model, the size of the parameters is related to factors such as porosity, geometric shape of gaps in the liquid permeation direction, particle size, arrangement direction and the like, spherical particles with the resin particle size of 400-600 microns are adopted, the porosity of a porous resin matrix is set to be 0.35 according to the arrangement rule of a porous medium, and the permeability is set to be 1.69 multiplied by 10 according to experimental parameters -10 m²；
Analyzing and comparing simulation results: the cross-sectional cloud images above the resin tank branch pipe type and the baffle-porous plate type porous medium at different flow rates are compared.
Among the above-mentioned technical scheme, entire system includes water tank, water pump, toper delivery water tank and resin jar, and the water that the water tank flows reaches the test flow after the water pump pressurization, reaches the resin jar water inlet through toper delivery water tank, and rivers top-down discharge from the delivery port after passing through the resin jar.
Among the above-mentioned technical scheme, test device adopts transparent ya keli board to make, because actual technology problem and ya keli board intensity restriction, test device can't make jar body size among the operating condition: the height was 3m and the diameter was 1.2m.
In the above technical solution, in the step 1, according to the mixing index calculation method, the method for determining the flow rate uniformity by software includes the following steps:
(1) Selecting a rectangular area on a specific section in the picture;
(2) When the fluid is not dyed, the rectangular area is in a transparent state, and after the rectangular area is completely dyed, the area is filled with the dyeing fluid and forms an interface with water in the flowing process;
(3) After the interface enters the rectangular area, the rectangular area presents the condition of partial dyeing and partial transparency due to the nonuniformity of the interface, a high-speed camera is adopted to shoot a video, MATLAB is used to capture a dyeing agent, a picture of the interface reaching the selected area is extracted, sampling points are divided, and the mixing index of color distribution in the rectangular area, namely the uniformity of water distribution, is calculated.
In the technical scheme, the chemical coloring agent used in the test is methyl blue, and the maximum flow of the water pump can reach 5.8m 3 The maximum lift reaches 34.5m.
The invention has the beneficial effects that: the invention relates to a water distribution method with multiple flow rates and high adaptability,
1. the water distribution method with multiple flow rates and high adaptability distinguishes that the uniformity of the baffle-porous plate type is compared with that of the branch and mother pipe type under different flow rates, and the degree of reduction of the uniformity index of the baffle-porous plate type is lower than that of the branch and mother pipe type along with the increase of the flow rate.
2. According to the water distribution method with the multiple flow rates and the high adaptability, eight symmetrical high-flow-rate regions are formed at the periphery of the flow interface of the branch-and-mother pipe type water distribution device, an octopus-shaped low-speed region is formed at the center of the flow interface, the speed uniformity is obviously reduced along with the increase of the flow rate, the flow interface of the baffle-porous plate type water distribution device is relatively uniform, no obvious high-flow-rate region or low-flow-rate region exists, and the speed uniformity is slightly reduced along with the increase of the flow rate.
3. The water distribution method with multiple flow rates and high adaptability analyzes the influence rule of different flow rates on the flow field of the mixed bed, compares the influence rule with a simulation result to verify the correctness and reliability of simulation, analyzes the water distribution uniformity of a branch and main pipe water distribution structure and a baffle-porous plate structure through full-working-condition simulation comparison, and optimally designs a high-uniformity water distribution device.
Drawings
Fig. 1 is a diagram of a test system of a water distribution method with high adaptability to multiple flow rates according to the present invention;
fig. 2 is a schematic diagram illustrating a mixing index calculation of a water distribution method with high flow rate and high adaptability according to the present invention;
FIG. 3 is a model diagram of a branch-and-mother pipe type and baffle-porous plate type for a water distribution method with multiple flow rates and high adaptability of the invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 1 to 3, the present invention provides a technical solution: a water distribution method with multiple flow rates and high adaptability comprises the following steps:
1) Simulating dyeing tracing uniformity; adding a dyeing fluid into the transparent colorless fluid, arranging a position in the measured flow field, continuously releasing the dyeing fluid at the position, enabling the dyeing fluid to flow downstream along with fluid micelles flowing through the position, dyeing the color of all the fluid micelles flowing through the position, forming a visible dyeing flow field by the fluid micelles to display the flow characteristic, and finally shooting a colored fluid flow image by using a high-speed camera and analyzing the colored fluid flow image through software;
in order to explore the water distribution conditions of the branch main pipe type and the baffle-porous plate type at each flow speed, the three-dimensional numerical simulation is carried out on the mixed bed device, the simulation result is compared with the experiment result, the accuracy and the reliability of the model are verified, and then the full-flow-speed working condition simulation is carried out, so that the flowing condition of the fluid in the resin tank is comprehensively mastered.
As shown in FIG. 3, wherein (a) is a model diagram of a branch and mother pipe type, and (b) is a model diagram of a baffle-porous plate type; geometric model and mesh division: establish 1 by SOLIDWORKS: 1, establishing a fluid region branch and mother pipe model, namely establishing a flow path of 1:1 fluid zone baffle-perforated plate model, the meshing adopts free tetrahedral meshing, and the middle uniform part of the resin tank adopts a sweeping mode to establish the mesh.
Setting simulation parameters: the fluid medium used by the model is water, and relevant parameters are as follows: performing thin-material transfer with density of 998.2kg/m and dynamic viscosity of 1.005 mPa.s, wherein inlet flow rate is controlled to be 1.73t/h and 3.21t/h as same as experimental flow rate, outlet is pressure outlet, boundary does not slide, diffusion coefficient in thin-material transfer module is reduced to 0, and initial value is 0mol/m 3 The inlet concentration is 3mol/m 3 。
Qualitative comparison of experiments and simulations: the simulation interface diagram and the experimental diagram of the branch-and-mother pipe type water distribution device at the flow rate of 20.23m/h and the flow rate of 37.54 m/h are compared with the simulation interface diagram and the experimental diagram of the baffle-porous plate type water distribution device.
Experimental and simulated quantitative comparisons: adopting MATLAB software to grab a rectangular area above the porous medium surface in the experimental video, and carrying out partition calculation according to a mixedness calculation formula, wherein MI is a mixing index, MI =0 represents a non-mixing condition, MI =1 represents complete uniform mixing, three-dimensional concentration in the simulation is led out to be in an animation format, and similarly carrying out mixedness calculation through MATLAB, so that the baffle-porous plate type uniformity is superior to a branch pipe type at all flow speeds, and the error between the experimental mixing index and the simulated mixing index is smaller no matter whether the branch pipe type or the baffle-porous plate type structure is adopted, therefore, the correctness of the model can be verified within an experimental allowable error range.
2) Analyzing the simulation result of the all-condition; from the comparison of the results of the simulation and the experiment, the correctness of the model is verified, and the following conclusion can be obtained: with the increase of the flow velocity, the uniformity of the branch and main pipes and the baffle-perforated plate is gradually reduced, and in order to explore the uniformity of the flow velocity under all practical conditions, a Computational Fluid Dynamics (CFD) method is used for carrying out three-dimensional numerical simulation on the mixed-bed water distribution device under the condition of considering a porous medium, so that the distribution uniformity degree of the water distribution device to the inlet water is comprehensively mastered.
A porous medium flow pattern;
dividing a geometric model and a grid;
setting simulation parameters;
analyzing and comparing simulation results;
under each flow velocity condition, the highest flow velocity of the branch and mother pipe type structure is higher than that of the baffle-porous plate type structure, the speed difference is higher than that of the baffle-porous plate type structure, the difference of the uniformity of the two structures is further increased along with the increase of the flow, the uniformity of the baffle-porous plate type structure under different flow velocities is better than that of the branch and mother pipe type structure, when the flow velocity is increased, the uniformity indexes of the branch and mother pipe type structure and the baffle-porous plate type structure are reduced to some extent, but the branch and mother pipe type structure is reduced more obviously, so that under the high flow velocity condition, the advantages of the baffle-porous plate type structure are more obvious, and the baffle-porous plate type structure is better than the branch and mother pipe type structure in the water distribution uniformity.
This embodiment, entire system includes water tank, water pump, toper delivery tank and resin jar (as shown in fig. 1), and after the water that the water tank flows out reached experimental flow after the water pump pressurization, reachd the resin jar water inlet through toper delivery tank, rivers top-down discharge from the delivery port after passing through the resin jar, the used chemical coloring agent of experiment is methyl blue, and water pump maximum flow can reach 5.8m 3 The maximum lift of the dye per hour reaches 34.5m, and methyl blue is also called royal blue, is an aromatic heterocyclic compound, is very easy to dissolve in cold water or hot water, is blue, has good dyeing performance, and is widely used for test dyeing.
This embodiment, test device adopts transparent acrylic plate to make, jar body size: the height is 3m, the diameter is 1.2m, and the water inlet and distribution device is designed and developed. The water distribution device is of a branch pipe type and a baffle plate-porous plate type, five flows are adopted in the experiment, the flow velocity of the resin tank is respectively 20m/h, 40m/h, 80m/h, 120m/h and 160m/h, and a dyeing tracer method is used for representing the flow field shape of the water distribution device in the resin tank and describing the flow uniformity of the fluid.
In this embodiment, the method for determining the flow rate uniformity by software and the steps thereof are as follows:
(1) Selecting a rectangular area on a specific section in the picture;
(2) When the fluid is undyed, the rectangular area is transparent. After the rectangular area is completely dyed, the area is filled with dyeing fluid and forms an interface with water in the flowing process;
(3) After the interface enters the rectangular area, the rectangular area is partially dyed and partially transparent due to the nonuniformity of the interface. And (3) shooting a video by adopting a high-speed camera, grabbing a coloring agent by using MATLAB, extracting a picture of which an interface reaches a selected region, dividing sampling points and calculating a mixing index of color distribution in a rectangular region, namely the uniformity of water distribution.
According to a similarity criterion, designing an acrylic plate model which is reduced in equal proportion, carrying out an experiment by using a dyeing tracing method, exploring the flow field forms of the lower branch pipe and the baffle-porous plate water distribution structure at different flow rates, analyzing the formation reason of the flow field forms, summarizing the influence rules of the flow fields caused by the different flow rates, comparing with a simulation result, verifying the correctness and reliability of the simulation model, and finally comprehensively analyzing the water distribution uniformity of the lower branch pipe water distribution structure and the baffle-porous plate structure at the actual working condition flow rate through full-working-condition simulation. From the above experimental and simulation results, the following conclusions can be drawn:
1. eight symmetrical high-flow-velocity areas are formed at the periphery of a flow interface of the branch and mother pipe type water distribution device, an octopus-shaped low-speed area is formed at the center of the flow interface, and the speed uniformity is obviously reduced along with the increase of the flow velocity.
2. The flow interface of the baffle-porous plate type water distribution device is uniform, no obvious high and low flow velocity region exists, and the velocity uniformity is slightly reduced along with the increase of the flow velocity.
3. The uniformity of the baffle-porous plate type is better than that of the branch pipe type and the mother pipe type under different flow rates, and the index reduction degree of the baffle-porous plate type uniformity is lower than that of the branch pipe type and the mother pipe type along with the increase of the flow rate.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A water distribution method with multiple flow rates and high adaptability is characterized in that: the comparative water distribution method comprises the following steps:
1) Dyeing tracing uniformity simulation;
a numerical calculation model;
geometric model and grid division: establish 1 by SOLIDWORKS: 1, establishing a fluid region branch and mother pipe model, namely establishing a flow path of 1:1, a fluid area baffle-porous plate model, wherein the grid division adopts free tetrahedral grid division, and the middle uniform part of a resin tank adopts a sweeping mode to establish a grid;
setting simulation parameters: the fluid medium used by the model is water;
experimental and simulated qualitative comparisons: comparing a simulation interface diagram and an experimental diagram of the branch and mother pipe type water distribution device with a simulation interface diagram and an experimental diagram of the baffle-porous plate type water distribution device at the flow rate of 20.23m/h and the flow rate of 37.54 m/h;
experimental and simulated quantitative comparisons: adopting MATLAB software to grab a rectangular area above the porous medium surface in the experimental video, carrying out partition calculation according to a mixedness calculation formula, wherein MI is a mixing index, MI =0 represents a non-mixing condition, MI =1 represents complete uniform mixing, deriving the three-dimensional concentration in the simulation into an animation format, and carrying out mixedness calculation through MATLAB;
analyzing the simulation result of the all-condition;
a porous medium flow pattern;
a uniformity index;
dividing a geometric model and a grid;
setting simulation parameters: the porosity and permeability parameters are required to be determined in a porous medium model, the size of the parameters is related to factors such as porosity, geometric shape of gaps in the liquid permeation direction, particle size, arrangement direction and the like, spherical particles with the resin particle size of 400-600 microns are adopted, the porosity of a porous resin matrix is set to be 0.35 according to the arrangement rule of a porous medium, and the permeability is set to be 1.69 multiplied by 10 according to experimental parameters -10 m²；
Analyzing and comparing simulation results: the cross-sectional cloud images above the resin tank branch pipe type and the baffle-porous plate type porous medium at different flow rates are compared.
2. The water distribution method with multiple flow rates and high adaptability according to claim 1, characterized in that: the whole system comprises a water tank, a water pump, a conical conveying water tank and a resin tank, wherein water flowing out of the water tank reaches a test flow after being pressurized by the water pump, and then reaches a water inlet of the resin tank through the conical conveying water tank, and water flow is discharged from a water outlet after passing through the resin tank from top to bottom.
3. The water distribution method with multiple flow rates and high adaptability according to claim 2, characterized in that: the test device adopts transparent acrylic plate to make, because actual technology problem and acrylic plate intensity restriction, test device's jar body size: height 3m and diameter 1.2m.
4. The water distribution method with multiple flow rates and high adaptability according to claim 1, characterized in that: in the step 1, according to the mixing index calculation method, the method for judging the flow velocity uniformity through software comprises the following steps:
(1) Selecting a rectangular area on a specific section in the photo;
(2) When the fluid is not dyed, the rectangular area is in a transparent state, and after the rectangular area is completely dyed, the area is filled with the dyeing fluid and forms an interface with water in the flowing process;
(3) After the interface enters the rectangular area, the rectangular area presents the condition of partial dyeing and partial transparency due to the nonuniformity of the interface, a high-speed camera is adopted to shoot a video, MATLAB is used for grabbing a dyeing agent, a picture of the interface reaching the selected area is extracted, sampling points are divided, and the mixing index of color distribution in the rectangular area, namely the uniformity of water distribution, is calculated.
5. The water distribution method with multiple flow rates and high adaptability according to claim 1, characterized in that: the chemical coloring agent used in the test is methyl blue, and the maximum flow of the water pump can reach 5.8m 3 The maximum lift reaches 34.5m.
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| CN (1) | CN115231656A (en) |
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