CN104636552A - Numerical simulation computing method based on ANSYS CFX software and used for desulphurization process in amidogen wet desulphurization spray single tower - Google Patents
Numerical simulation computing method based on ANSYS CFX software and used for desulphurization process in amidogen wet desulphurization spray single tower Download PDFInfo
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Abstract
The invention provides a numerical simulation computing method based on ANSYS CFX software and used for a desulphurization process in an amidogen wet desulphurization spray single tower, and relates to the technical field of amidogen wet desulphurization. The method can be used for numerical simulation of different mass transfer and heat transfer processes in the amidogen wet desulphurization tower, can be used for predicting the flow field in the tower in a short time, plays a positive role in optimizing the tower body structure and process operating parameters of the tower, and improves efficiency.
Description
Technical field
The present invention relates to amino Wet Flue Gas Desulfurization Technique field, particularly to the numerical simulation calculation of sweetening process in its desulfurization spraying single-tower.
Background technology
Amino wet desulphurization is compared with traditional calcium method desulfurization, and have system simple, equipment volume is little, energy consumption is low, and desulfuration efficiency is high, and operating cost is low, accessory substance can utilize, and can realize the advantages such as combined denitration, but the amino Wet Flue Gas Desulfurization Technique being applied to sinter fume is not yet ripe.Especially in amino wet method list tower desulphurization system, " the escaping of ammonia ", " gasoloid " phenomenon are very serious, wherein sulfur removal technology operational factor is unreasonable, air flow method is uneven and the too high escape amount that all can increase ammonia of local gas speed, easily forms gasoloid, severe contamination surrounding environment.Because traditional tower equipment design method can only provide some analysis results qualitatively, the optimal design etc. adopting conventional research method to carry out bench run or to carry out actual loading test on the device put into operation costly, and for specific equipment or structure, larger limitation can only be had.At present, CFD software, for the physical chemical phenomenon of various complexity, adopts different numerical computation methods, makes computing velocity and precision reach best of breed in field undetermined, thus the computational problem of high efficiency solution institute research field.Wherein, ANSYS CFX is due to the working interface of its close friend, and powerful pre-process and post-process function, stable convergence, the user interface program of accurate result of calculation and a series of different levels, thus applies comparatively extensive.Therefore, with CFD software ANSYS CFX for analog computation platform, set up a kind of computing method that can realize simulating sweetening process in amino wet desulphurization spray column, to realize the optimization of desulfuration spray tower structure, Process operating parameters etc., improve desulfuration efficiency, reduce the generation of " the escaping of ammonia ", " gasoloid ", have and important realize meaning.
Summary of the invention
For problems of the prior art, the object of the invention is to provide a kind of computing method realizing simulating sweetening process in amino wet desulphurization spraying single-tower, that is: the method for fluid mechanics and mass transfer, heat transfer aspect and desulfurizer are combined, in this patent, research to as if amino wet desulphurization spraying single-tower.This technology can study flow field in desulfurizer and mass transfer, diabatic process effectively, provides a kind of new method for improving the phenomenons such as " the escaping of ammonia " " gasoloid " further.
In order to achieve the above object, technical scheme of the present invention comprises the following steps:
1, institute's produced problem in running according to on-the-spot desulfurizer, determines to emulate object, then does certain structure according to literature survey and emulation object to tower body and simplifies, then adopt three-dimensional drawing software UG to set up the full-scale 3-D geometric model of desulfurizer;
2, because housing structure is comparatively simple, adopt ANSYS ICEM CFD software to carry out stress and strain model to geometric model, export with the form of CFX, and carry out the analysis of grid independence, obtain the grid file of Bestgrid number;
3, grid file is imported in ANSYS CFX-Pre carry out physical definition, according to the running environment in the amino wet desulphurization spraying single-tower in scene and when not affecting calculating accuracy, certain hypothesis and simplification are done to gas liquid two-phase flow situation in absorption tower, are specifically set as follows:
1) definition of liquid phase material: arrange flue gas and slurries data under on-the-spot operating condition, sets the density of flue gas and slurries under this operating mode, kinematic viscosity, the parameters such as coefficient of heat conductivity;
2) definition of Chemical Reaction Model: set up SO in amino wet desulphurization spraying single-tower according to double-film theory
2the chemical reaction correlation absorbed, in conjunction with the experience in document and semiempirical correlation and experimental result, draws SO in amino wet desulphurization list tower
2the mathematical model absorbed, is written as user-defined CCL (CFX Command Language) file, then imports in pre-treatment CFX-Pre the definition completed expression formula by each mathematic(al) representation;
3) definition in heterogeneous basin: porous medium territory will be set as except fog-zone, other tower body space is set as fluid domain, the setting of model in Simulation of Multiphase Flow, comprising: the collision model between turbulent flow computation model, alternate heat TRANSFER MODEL, drop and breakup of drop model etc.;
4) definition of nozzle: each nozzle defines separately, the position of nozzle is in strict accordance with design drawing with in the form of three-dimensional rectangular coordinate input CFX-Pre, and the characteristic of each nozzle can be characterized by series of characteristics parameters such as form of nozzle, spray angle, atomization droplets diameter distribution, drop outlets speed and mass flowrates thereof;
5) definition of boundary condition: the boundary condition in corresponding field is set, as tower body import, outlet, wall border are arranged, and the arranging of territory interface;
6) setting solves calculating controling parameters: arrange according to concrete case and solve form, physical time yardstick, particle under-relaxation factor and the condition of convergence etc.;
4, the numerical evaluation file that suffix is called def is exported, import in CFX-Solver and define analog computation, finite volume method is adopted to solve, by the observation to information in working interface, check that the residual sum of variable solves information, produced problem or check the order of accuarcy solved in Timeliness coverage computation process;
5, carry out visual analyzing by the analog computation result of aftertreatment CFX-Post to convergence, obtain the velocity distribution of flue gas in desulfurizer, Temperature Distribution, pressure distribution and SO
2removal efficiencies etc., derive the velocity standard deviation that analog computation result obtains cross section air-flow in tower, judge flow distribution evenness;
6, the analog computation result under different operating mode and experimental result are compared, the rationality of verification model.
The advantage that the present invention has is: 1. finite volume method applies in the analysis of desulfurizer inner transmission matter, heat transfer by this method, effectively can overcome the dependence to experimental facilities in conventional research method, the method of using numerical analysis instead is simulated mass transfer, heat transfer in sweetening process in wet desulphurization spraying single-tower amino under multiple operating mode, make sightless flow field change in tower visual, and reach optimal design effect by change correlation parameter, accelerate housing structure and Process operating parameters optimization progress thereof, reduce design cost.2. this method take into account the collision of sprayed slurry drops with broken, and demist layer is on the impact in whole flow field.3. this method is according to actual column body structure and Process operating parameters modeling, and the result of calculation of simulation and experimental result contrast, can the reliability of verification model.
Accompanying drawing explanation
Fig. 1 is techniqueflow chart of the present invention.
Fig. 2 is the three-dimensional modeling figure of the amino wet desulphurization spraying single-tower of certain sintering plant flue gas in case study on implementation.
Fig. 3 is the Structure Network trrellis diagram of desulfurization spraying single-tower flow field regions in case study on implementation.
Fig. 4 is velocity of flue gas motion pattern in desulfurization spraying single-tower in case study on implementation.
Fig. 5 is section temperature cloud atlas in desulfurization spraying single-tower in case study on implementation.
Fig. 6 is sectional pressure cloud atlas in desulfurization spraying single-tower in case study on implementation.
Embodiment
Below in conjunction with concrete case study on implementation, the present invention is described in more detail.
As shown in Figure 1, specific embodiment of the invention step comprises:
1. according to sintering plant desulfurization single stripper operation institute produced problem in case, " the escaping of ammonia " " gasoloid " phenomenon is more serious, need to study housing structure and Process operating parameters thereof, then do certain structure according to domestic and international present Research and emulation object to this tower body to simplify, adopt three-dimensional drawing software UG to set up the full-scale 3-D geometric model of desulfurizer again, Fig. 2 is the three-dimensional modeling figure after the amino wet desulphurization spraying single-tower of certain sintering plant flue gas simplifies.Three-dimensional modeling figure after simplification is provided with smoke inlet and outlet, is provided with slurries liquid level, the first spraying layer, the second spraying layer, the 3rd spraying layer and removes fog-zone in tower body.
2. because housing structure in case is comparatively simple, ANSYS ICEM CFD software is adopted geometric model to be divided into mesh quality and convergence hexahedron structure grid all preferably, as shown in Figure 3, export with the form of CFX, and carry out the analysis of grid independence, obtaining Bestgrid number is about 1,000,000.
3. grid file is imported in ANSYS CFX-Pre and carry out physical definition, in case, research emphasis is flue gas and the Flow Field Distribution situation of sprayed slurry in tower of more than Starch Level, according to the running environment in the amino wet desulphurization spraying single-tower in scene and when not affecting calculating accuracy, certain hypothesis and simplification are done to gas liquid two-phase flow situation in absorption tower.
1) definition of liquid phase material: arrange flue gas and slurries data under on-the-spot operating condition, smoke components is by 380 ppm SO
2, 210 ppm NO, 0.548% CO, 5.7% CO
2, 15% O
2, 10% H
2o and 68.694% N
2composition, slurries are by NH
4hSO
3, (NH
4)
2sO
3(NH
4)
2sO
4composition, obtains the density of flue gas and slurries under this operating mode, kinematic viscosity, the parameters such as coefficient of heat conductivity.
2) definition of Chemical Reaction Model: set up SO in amino wet desulphurization spraying single-tower according to double-film theory
2the chemical reaction correlation absorbed, in conjunction with the experience in document and semiempirical correlation and experimental result, draws SO in amino wet desulphurization list tower
2the mathematical model absorbed, is written as user-defined CCL (CFX Command Language) file, then imports in pre-treatment CFX-Pre the definition completed expression formula by each mathematic(al) representation.
3) definition in heterogeneous basin: the mist eliminator that the corrugated plate diamond by band barb is arranged is set as porous medium territory, and other tower body space is set as fluid domain.In running according to scene, the height of demist layer is 2.5 m, the permeability of pressure drop to be 100 pa and velocity of flue gas be 3.5 m/s obtain porous medium is 1.68 × 10
-6m
2.
Due in amino wet method list tower spray desulphurization system, shared by its Particle Phase, the volume fraction of gas phase is far below 10%, flue gas is considered as continuous phase, sprayed slurry is considered as discrete phase, adopt Euler-Lagrangian model to solve quality, momentum, the energy conservation equation of particle, obtain the various changes of particle at track, the heat transmission between two-phase adopts Ranz-Marshall model, the collision model of slurry drops selects Sommerfeld model, breakup of drop model selection TAB model.Practical sulphur removal tower fluid flow inside is complicated Three dimensional Turbulent flow field, and when adopting three-dimensional Reynolds during calculating, equal N-S equation is to describe the turbulent flow of incompressible fluid in tower, and turbulence model adopts the RNG with swirling modification
k-
εmodel, concrete equation is as follows:
Continuity equation:
4) definition of nozzle: arrange three layers of nozzle (dual-purpose standby) in case in flue gas desulfurization spray tower, each nozzle defines separately, the position of nozzle inputs in CFX-Pre in strict accordance with design drawing with the form of three-dimensional rectangular coordinate, the characteristic of each nozzle is: form of nozzle selects Cone type, spray angle is 90 °, injection direction is contrary with flue gas flow direction, and atomization droplets diameter distribution meets Rosin-Rammler distribution, drop outlets speed be 6 m/s and mass flowrate thereof is 18.2 m/s etc.
5) definition of boundary condition: velocity of flue gas import is set: 13 m/s, export boundary condition: static pressure is 0 Pa, wall condition: adopt based on
εthe Scalable Wall-function of Equation Turbulence Model, thinks fluid at wall without slippage with without mass osmosis condition, drop and wall generation perfectly elastic impact.The interface in fluid domain and porous medium territory sets: interface Model Selection General Connection, and Border-zone infarcts connected mode selects GGI.
6) setting solves calculating controling parameters: difference scheme selects the mixed mode all can taken into account result reliability and convergence, hybrid cytokine is 0.9, solve form and select high-order Solution model, physical time yardstick is 0.01, the condition of convergence is 1e-4, particle under-relaxation factor sets: speed 0.3, energy 0.7.
4. export the numerical evaluation file that suffix is called def, import in CFX-Solver and define analog computation, finite volume method is adopted to solve, by the observation to information in working interface, check that the residual sum of variable solves information, see its convergence situation and energy conservation situation, improve convergence situation by change analog computation optimum configurations.
5. carry out visual analyzing by the result of calculation of aftertreatment CFX-Post to simulation, obtain the velocity distribution of flue gas in desulfurizer, Temperature Distribution, pressure distribution and SO
2removal efficiencies etc., derive the velocity standard deviation that analog computation result obtains cross section air-flow in tower, judge the homogeneity of air flow method in tower.
6. the analog computation result under different operating mode and experimental result are compared, the rationality of verification model.
The method of this numerical simulation of the present invention, not only can observe tower inner fluid flow state intuitively, and provides strong basis for the optimization of amino wet desulphurization tower structure and Process operating parameters thereof.Numerical simulation method based on sweetening process in the amino wet desulphurization spraying single-tower of ANSYS CFX software of the present invention can for the numerical simulation of the amino wet desulfuration tower inner transmission matter of difference, diabatic process, flow field in tower can be predicted within a short period of time, the optimization of housing structure and Process operating parameters thereof is played and acts on energetically, raise the efficiency.This method can reflect the mass-and heat-transfer process of gas-liquid in tower more exactly, more perfect only to the numerical simulation of flow field in tower research, certain facilitation is played to traditional method for designing.
Claims (1)
1., based on a numerical simulation method for sweetening process in the amino wet desulphurization spraying single-tower of ANSYS CFX software, it is characterized in that comprising the following steps:
1) do certain structure to tower body to simplify, then adopt three-dimensional drawing software UG to set up the full-scale 3-D geometric model of desulfurizer;
2) adopt ANSYS ICEM CFD software to carry out stress and strain model to described geometric model, export with the form of CFX, and carry out the analysis of grid independence, obtain the grid file of Bestgrid number;
3) physical definition is carried out by described grid file importing ANSYS CFX-Pre, according to the running environment in the amino wet desulphurization spraying single-tower in scene and when not affecting calculating accuracy, do suppose and simplify to gas liquid two-phase flow situation in absorption tower, be specifically set as follows:
A. the definition of liquid phase material: arrange flue gas and slurries data under on-the-spot operating condition, sets the density of flue gas and slurries under this operating mode, kinematic viscosity and coefficient of heat conductivity parameter;
B. the definition of Chemical Reaction Model: set up SO in amino wet desulphurization spraying single-tower according to double-film theory
2the chemical reaction correlation absorbed, in conjunction with experience and semiempirical correlation and experimental result, draws SO in amino wet desulphurization list tower
2the mathematical model absorbed, is written as user-defined CCL file by each mathematic(al) representation, then imports in pre-treatment CFX-Pre the definition completed expression formula;
C. the definition in heterogeneous basin: porous medium territory will be set as except fog-zone, other tower body space is set as fluid domain, the setting of model in Simulation of Multiphase Flow, comprising: the collision model between turbulent flow computation model, alternate heat TRANSFER MODEL, drop and breakup of drop model;
D. the definition of nozzle: each nozzle defines separately, the position of nozzle is with in the form of three-dimensional rectangular coordinate input CFX-Pre, and the characteristic of each nozzle is characterized by form of nozzle, spray angle, atomization droplets diameter distribution, drop outlets speed and mass flowrate characterisitic parameter thereof;
E. the definition of boundary condition: set the boundary condition in corresponding field, comprises tower body import, outlet, the setting of wall border, and the setting of territory interface;
F. arrange and solve calculating controling parameters: arrange according to concrete case and solve form, physical time yardstick, particle under-relaxation factor and the condition of convergence;
4) the numerical evaluation file that suffix is called def is exported, import in CFX-Solver and define analog computation, finite volume method is adopted to solve, by the observation to information in working interface, check that the residual sum of variable solves information, produced problem or check the order of accuarcy solved in Timeliness coverage computation process;
5) carry out visual analyzing by the analog computation result of aftertreatment CFX-Post to convergence, obtain the velocity distribution of flue gas in desulfurizer, Temperature Distribution, pressure distribution and SO
2removal efficiency, derives the velocity standard deviation that analog computation result obtains cross section air-flow in tower, judges flow distribution evenness;
6) the analog computation result under different operating mode and experimental result are compared, the rationality of verification model.
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