CN111760445A - Desulfurizing tower flow field simulation method - Google Patents
Desulfurizing tower flow field simulation method Download PDFInfo
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- CN111760445A CN111760445A CN202010599445.1A CN202010599445A CN111760445A CN 111760445 A CN111760445 A CN 111760445A CN 202010599445 A CN202010599445 A CN 202010599445A CN 111760445 A CN111760445 A CN 111760445A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention provides a method for simulating a flow field of a desulfurizing tower, which comprises the following steps: based on the uniform air inlet device, a flow field simulation experiment system is established to perform detailed flow field analysis on the desulfurizing tower. Wherein, even air inlet unit can improve the inside gas distribution of desulfurizing tower, and then improves desulfurization efficiency. The simulation method based on the experimental system takes the pressure drop of the measured spraying layer as the simulated pressure drop, determines the resistance coefficient of the porous medium through formula fitting, provides a data base for equivalent replacement of the spraying layer, and ensures that the simulation is more rigorous and accurate. In the simulation process, pressure sampling is carried out through section point taking, and the pressure drop of a spraying layer of the experiment system can be accurately obtained; the E value is used as a standard for judging the distribution uniformity of the gas in the tower, and the variation condition of the E value of each section in the tower along with the tower height is obtained through quantitative calculation, so that the uniformity analysis result is visual and clear.
Description
Technical Field
The invention relates to the field of chemical equipment, in particular to a method for simulating a flow field of a desulfurizing tower.
Background
The wet desulphurization is the most effective flue gas desulphurization method in the current chemical industry, and has the advantages of high desulphurization efficiency, mature technology, stable operation and the like. The spray desulfurizing tower is a core device for wet desulfurization, and SO2 in the inlet flue gas in the desulfurizing tower and limestone slurry sprayed from the spray layer react through gas-liquid reaction to remove SO 2.
The uniformity of the flue gas distribution in the desulfurization tower is a key factor in maintaining desulfurization efficiency. If the speed fluctuation of the flue gas on the same section is large, the gas-liquid two-phase reaction in the high-speed area is insufficient, and the absorbent in the low-speed area is excessive, so that the desulfurization efficiency is reduced finally. Therefore, the uniformity of the flue gas distribution in the desulfurizing tower is kept, and the desulfurizing efficiency is favorably improved. The gas inlet device is an important component of the desulfurization tower, and directly influences the distribution uniformity of gas inside the desulfurization tower, and finally influences the desulfurization efficiency.
Fluent is a simulation software based on CFD (computational fluid dynamics) which simulates the flow of fluid in real engineering by a computer. Because the desulfurizing tower has a huge structure, the field experiment has great difficulty, and the experiment expense is not only a little. Although Fluent software can simulate the distribution of flue gas flow field inside a desulfurizing tower, nowadays, most desulfurizing tower simulations inevitably have structural equivalent replacement. Taking the porous medium as an example to replace the spray layer, the existing simulation obtains the resistance coefficient of the porous medium by assuming the pressure drop of the gas passing through the porous medium, so that the support of experimental data is lacked, and the simulation accuracy is not verified.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for simulating a flow field of a desulfurizing tower, which comprises the following steps: based on the uniform air inlet device, a simulation experiment system is established to carry out detailed simulation calculation on the flow field in the desulfurizing tower.
A uniform air inlet device of a desulfurizing tower is characterized by comprising,
the device comprises a circular distribution pipe, a main gas inlet pipe, a gas transmission pipeline and a support;
the annular distribution pipe is radially inwards provided with a gas transmission pipeline fixedly connected with the tower body, the gas transmission pipeline is provided with a plurality of gas transmission pipelines which are uniformly distributed along the circumferential direction of the distribution pipe, and the radial outwards-facing part of the distribution pipe is provided with a main gas inlet pipe.
In addition to the above-described aspects, it is preferable that,
the gas transmission pipeline comprises a pipe head, a connecting pipe and an expanding pipe, wherein the pipe head, the connecting pipe and the expanding pipe are arranged on the distribution pipe, the expanding pipe is fixedly installed on the tower body, two ends of the connecting pipe are respectively fixedly connected with the pipe head and the expanding pipe through flanges, and the inner diameter of the expanding pipe is linearly enlarged in the radial inward direction of the distribution pipe.
In addition to the above-described aspects, it is preferable that,
the support includes the brace table, and the brace table upper end has the recess, and installation lower fixing ring in the recess, lower fixing ring fixed connection upper fixing ring, lower fixing ring surround and form the staple bolt that is used for fixed distribution pipe, and the staple bolt passes through bolt and brace table fixed connection.
A flow field simulation experiment system of a desulfurizing tower comprises,
the tower body is provided with a flue gas inlet, and a slurry pool, an inlet flue section, a spraying layer and an outlet flue section are sequentially arranged in the tower body from bottom to top. And the tower body is a reduced version of the actual desulfurizing tower, and the reduction ratio can be freely selected according to simulation requirements.
A control system which comprises a fan connected with the flue gas inlet through a connecting pipe A, wherein the connecting pipe A is provided with a valve A and a flue gas flowmeter,
a circulating slurry pump communicated with the slurry pool through a connecting pipe B, the circulating slurry pump is connected to the spraying layer through a connecting pipe C, a slurry flowmeter and a valve B are arranged on the connecting pipe C,
the controller, the computer, the valve A, the valve B, the flue gas flowmeter, the slurry flowmeter and the circulating slurry pump are electrically connected, and the inlet face and the outlet face of the spraying layer are provided with pressure sampling devices.
A flow field simulation method of a desulfurizing tower comprises the following steps,
firstly, starting a control system, inputting spraying amount in a computer, keeping the spraying amount constant, respectively inputting different speed values into the computer so as to carry out experiments, wherein in the experiment process, pressure sampling is needed,
the pressure sampling process comprises the following steps: a plurality of points are taken on the circular cross section of the inlet and the outlet of the spraying layer, and the total number is 25 points. The method for taking the pressure value at each point is as follows: selecting a time interval, collecting a plurality of pressure values of the point in the time interval, wherein the output value of the point is the average value of the pressure values, and the pressure value of the whole section is the average value of the 25 pressure values. Then, calculating the pressure drop delta p of the spraying layer, wherein the pressure drop is equal to the value obtained by subtracting the pressure value of the outlet section from the value of the inlet section of the spraying layer, the spraying layer is a porous medium,
secondly, the velocity value and the corresponding pressure drop value in the first finishing step correspond to the V-delta p data,
fitting a formula, taking the air inlet speed in the experimental model as the simulated air inlet speed, taking the pressure drop of the spraying layer as the pressure drop of the porous medium,
when the porous medium is used for replacing the spraying layer for simulation, the resistance coefficient of the porous medium needs to be input, and the resistance coefficient can be determined by fitting a formula through V-delta p data. In Fluent, the empirical formula of V- Δ p fitting is
Where μ is the hydrodynamic viscosity (unit: Pa.s), t is the thickness of the porous medium (unit: m), ρ is the fluid density (unit: kg/m3), C1Is a viscous drag coefficient (unit: 1/m2), C2Is the inertial resistance coefficient (unit: 1/m),
carrying out resistance coefficient C according to the V-delta p data in the step (II)1And C2And (4) solving to finally obtain a complete equation.
And fourthly, formally carrying out Fluent simulation, comprising the following steps:
(1) establishing a uniform desulfurizing tower model: the spray layer is replaced by a porous medium,
(2) grid division: care is taken to maintain the quality of the grid,
(3) selecting a model: a standard turbulent flow model is selected and used,
(4) setting a boundary condition: inputting the speed data of the first step by adopting a speed inlet condition; the outlet condition is a pressure outlet; setting up the porous medium, inputting C in step three1And C2The data of the data is transmitted to the data receiver,
(5) adopting a simple algorithm to carry out iterative computation,
(6) selecting a plurality of circular sections in the model, sampling the speed, respectively taking points on inner and outer rings in the sections, totaling 25 points, and obtaining the speed value. After the velocity of each point is collected, the gas distribution uniformity of the whole section is calculated, the uniformity is expressed by E (hereinafter referred to as E value), and the formula is as follows:
wherein, ViFor each selected point speed, VaIs the average velocity between points. And after the speed sampling of the single section is finished, continuing the speed sampling of other sections, and finally drawing a transformation diagram of the E value in the tower height direction.
The invention has the advantages that:
1. the uniform gas inlet device provided by the invention can enable the gas inside the desulfurizing tower to be distributed more uniformly, so that the desulfurizing efficiency is improved, and specifically:
(1) the support among the even air inlet unit surrounds the staple bolt that is used for fixed distributing pipe with upper fixed ring, lower fixed ring, can make laying of annular distributing pipe become firm, causes too big vibration to the pipe wall impact when avoiding gaseous entering.
(2) The even air inlet device is provided with a plurality of air delivery pipes which are circumferentially arranged along the distribution pipe, so that the condition of air inlet disorder is avoided. The pipe that laminates with the pipe wall adopts the expand tube structure of the linear grow of internal diameter for each strand converges the regional centre circle area grow of converging of admitting air, has increased the area of admitting air, is favorable to improving the interior gas distribution homogeneity of tower.
2. The simulation method provided by the invention can be used for carrying out accurate numerical analysis on the gas distribution condition, and specifically comprises the following steps:
(1) a flow field simulation experiment system is provided, spraying layer pressure drop data measured by the system is used as simulation data, the resistance coefficient of a porous medium is determined through formula fitting, a data basis is provided for equivalent replacement of a spraying layer, and simulation is more rigorous and accurate.
(2) Pressure sampling is carried out through cross section point taking, and the pressure drop of the spraying layer of the experimental system can be accurately obtained. Compared with a method directly assuming pressure drop of a spraying layer, the data provided by the point sampling method is more accurate.
(3) The E value is used as a standard for judging the uniformity of gas distribution in the tower, and a variation graph of the E value of each section in the tower along with the tower height is obtained through quantitative calculation, so that the uniformity analysis result is visual and clear.
(4) A conventional air inlet tower model is established, and a flow field in the tower is analyzed. The conventional air inlet tower simulation analysis can be used as a reference object, and the superiority of the uniform air inlet device on the gas distribution can be clearly and prominently displayed.
Drawings
Fig. 1 is a structural view of a homogeneous intake apparatus.
FIG. 2 is a view showing the flange connection between the connecting member and the expanding pipe.
Fig. 3 is a view showing the structure of the stand.
Fig. 4 is a diagram of a desulfurizing tower flow field simulation experiment system.
Fig. 5 is a pressure acquisition diagram.
FIG. 6 is a three-dimensional model of two types of column equipment (a is a uniform air intake device and b is a conventional air intake device).
Fig. 7 is a diagram of the internal flow field of two tower models (a for a uniform air inlet and b for a conventional air inlet).
FIG. 8 is a graph showing the variation of E value of each section in the interior of two tower models with the tower height.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention, and in this context, detachable fixation means that the components can be detached without destroying their original performance.
As shown in the figures 1-8 of the drawings,
the uniform air inlet device is characterized by comprising,
annular distributing pipe 7, the main pipe of admitting air 1, gas transmission pipeline, support 2.
The annular distribution pipe 7 is radially inwards provided with a gas transmission pipeline fixedly connected with the tower body, the gas transmission pipeline is provided with a plurality of gas transmission pipelines which are uniformly distributed along the circumferential direction of the distribution pipe, and the radial outwards-facing part of the distribution pipe is provided with a main gas inlet pipe 1.
When the gas distribution device is used, smoke enters the distribution pipe from the gas inlet main pipe and flows to the periphery along the distribution pipe. And then, the diffused flue gas enters the tower body, namely the inside of the desulfurization tower, from the gas transmission pipeline of the inner ring. As shown in FIG. 1, after entering the desulfurization tower, the flue gas enters an annular region 5, which is a confluence region, after the inlet routes of the flue gas collide. And finally, the flue gas is uniformly filled in the circular cross section of the desulfurizing tower.
The gas transmission pipeline comprises a pipe head arranged on the distribution pipe, a connecting pipe 4 and an expanding pipe 3 fixedly arranged on the tower body, the two ends of the connecting pipe are respectively fixedly connected with the pipe head and the expanding pipe through flanges, and the inner diameter of the expanding pipe is linearly enlarged in the radial inward direction of the distribution pipe.
The expanding pipe is attached to the tower body 6, the inner ring of the distribution pipe is connected with the expanding pipe through a connecting piece in a connection mode shown in figure 2, and the upper flange 8 and the lower flange 9 are fixed through bolts 12, gaskets 11 and nuts 10.
Wherein, adopt the pipe structure that expands of the linear grow of internal diameter, its effect is: relative straight tube structure, the expand tube makes each share converge district center circle area grow that admits air to make gaseous evenly distributed at whole cross-section of admitting air, avoided the condition of admitting air disorder.
Still including the support 2 that is used for supporting the distributing pipe, the support includes brace table 203, and the brace table up end has the recess, and installation lower fixing ring 202 in the recess, lower fixing ring fixed connection upper fixing ring 201, upper fixing ring, lower fixing ring surround and form the staple bolt that is used for fixed distributing pipe, and the staple bolt passes through bolt and brace table fixed connection.
Wherein, the technical effect of support structure is: can make the laying of annular distribution pipe become firm, impact the pipe wall when avoiding gaseous entering and cause too big vibration.
The flow field simulation experiment system of the desulfurizing tower comprises a tower body 26, wherein a flue gas inlet 14 is arranged on the tower body, a slurry pool 19, an inlet flue section 17, a spraying layer 13, an outlet flue section 27 and a flue are sequentially arranged in the tower body from bottom to top
The control system comprises a fan 18 connected with the flue gas inlet through a connecting pipe A, a valve A16 and a flue gas flowmeter 15 are arranged on the connecting pipe A,
a circulating slurry pump 22 communicated with the slurry pool through a connecting pipe B, wherein the circulating slurry pump 22 is connected to the spraying layer through a connecting pipe C, a slurry flowmeter 23 and a valve B are arranged on the connecting pipe C,
the controller 20, the computer 21, the valve A, the valve B, the flue gas flowmeter, the slurry flowmeter and the circulating slurry pump are electrically connected,
pressure sampling devices are arranged on the inlet face and the outlet face of the spraying layer.
In the simulation experiment system, the computer controls the flow and speed of the flue gas and the flow of the circulating slurry through the opening of the controller control valve A, B according to the set working condition. The flowmeter can feed back the flow data of gas phase and liquid phase to the computer in real time.
Based on the experimental system, the invention provides a flow field simulation method, which comprises the following assumptions:
flue gas is replaced by air in the experimental system; the slurry section is not included in the simulation range; the circulating slurry is replaced by liquid water; in finite element simulation, the spray layer in the tower is replaced by a porous medium model.
The specific simulation steps are as follows:
firstly, starting a control system, inputting the spraying amount in a computer and keeping the spraying amount constant. And inputting different speed values into a computer respectively to carry out experiments, wherein pressure sampling is required in the experiment process.
The pressure sampling process comprises the following steps: several points (as shown in figure 5) are taken on the circular cross section of the inlet and the outlet of the spraying layer, and the total number of the points is 25. The method for taking the pressure value at each point is as follows: selecting a time interval, collecting a plurality of pressure values of the point in the time interval, wherein the output value of the point is the average value of the pressure values, and the pressure value of the whole section is the average value of the 25 pressure values. Then, the pressure drop Δ p of the spraying layer is calculated, and the pressure drop is equal to the value obtained by subtracting the pressure value of the outlet section from the value of the inlet section of the spraying layer.
And II, sorting the speed value in the step I and the corresponding pressure drop value thereof, and corresponding to the V-delta p data.
And thirdly, fitting by a formula, wherein a porous medium is used for replacing a spraying layer in the simulation, so that the principle of equivalent replacement of the porous medium is as follows: and taking the air inlet speed in the experimental model as the simulated air inlet speed, and taking the pressure drop of the spraying layer as the pressure drop of the porous medium.
When the porous medium is used for replacing the spraying layer for simulation, the resistance coefficient of the porous medium needs to be input. The drag coefficient can be determined from the V- Δ p data by fitting a formula. In Fluent, the empirical formula of V- Δ p fitting is
Where μ is the hydrodynamic viscosity (unit: Pa.s), t is the thickness of the porous medium (unit: m), ρ is the fluid density (unit: kg/m3), C1Is a viscous drag coefficient (unit: 1/m2), C2Is the coefficient of inertial resistance (unit: 1/m).
Subsequently, the resistance coefficient C is carried out according to the V-delta p data in the step (2)1And C2And (4) solving to finally obtain a complete equation.
And fourthly, formally carrying out Fluent simulation, comprising the following steps:
(1) establishing a conventional air inlet desulfurizing tower model: the spray layer is replaced with a porous media.
(2) And dividing the grid, and keeping the grid quality.
(3) Selecting a model: a standard turbulence model is selected.
(4) Setting a boundary condition: inputting the speed data of the first step by adopting a speed inlet condition; the outlet condition is a pressure outlet; setting up the porous medium, inputting C in step three1And C2And (4) data.
(5) And (5) performing iterative computation by using a simple algorithm.
(6) And selecting a plurality of circular sections in the model, and carrying out speed sampling. Points are respectively taken on the inner ring and the outer ring in the section, 25 points are counted, and the speed values are obtained. After the velocity of each point is collected, the gas distribution uniformity of the whole section is calculated, the uniformity is expressed by E (hereinafter referred to as E value), and the formula is as follows:
wherein, ViFor each selected point speed, VaIs the average velocity between points. And after the speed sampling of the single section is finished, continuing the speed sampling of other sections, and finally drawing a transformation diagram of the E value in the tower height direction.
And fifthly, simulating the uniform air inlet desulfurizing tower, selecting parameters and processes the same as those of the step four, and calculating the value E.
The following describes a simulation of a uniform air intake tower as compared to a conventional air intake tower, according to one embodiment of the present invention:
the uniform air inlet tower and the conventional air inlet tower are subjected to three-dimensional modeling by utilizing Solidworks, and as shown in FIGS. 6(a) and (b), the two towers are divided into an air inlet part, a porous medium area and an air outlet part.
Carrying out simulation: importing the model into Fluent software, and dividing grids; adopting a standard turbulence model, setting the inlet speed to be 4m/s, adopting a pressure outlet under the outlet condition, and adopting a porous medium area C1＝5.33e6 1/m2、C2The calculation was carried out for 2.33e 41/m data.
FIG. 7(a) is a gas flow diagram in the column of the present invention: when gas enters the distribution pipe from the main gas inlet pipe, the speed reduction amplitude is large. Then, the gas enters the expanding pipes from the periphery along the distribution pipe and finally uniformly enters the tower, and the gas inlet speed of each expanding pipe is balanced. Due to the circumferential air inlet, the confluence collision of the air inlet sections at the center of the tower is generated, and then the air inlet sections rise. The gas in the tower is not disturbed strongly, and the gas in the whole space in the tower does not generate reflux and vortex when rising, so that the gas distribution is relatively uniform.
Fig. 7(b) is a gas distribution flow chart in the conventional intake tower. Because the gas inlet is arranged obliquely downwards, baffling can be generated when the gas enters, so that the gas velocity in the left space and the right space in the tower is obviously layered, even reflux can be generated sometimes, and the uniformity of the gas velocity is to be improved.
In order to study the uniformity of the gas distribution more accurately, the value of gas E in the height direction of the column was calculated. From FIG. 8, it can be found that the uniform air intake tower (E)2) Is lower than that of a conventional air intake tower (E)1). If 0.15 is used as the standard for judging whether the gas distribution is uniform or not, the gas distribution of the two can reach the standard. The difference is that the uniform gas inlet tower can reach the standard before entering the porous medium area, while the conventional gas inlet tower needs to reach the standard through the action of the porous medium area. Simulations show that the homogeneous gas inlet device has an improved distribution of gas over conventional gas inlets.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes 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.
Claims (5)
1. A uniform air inlet device of a desulfurizing tower is characterized by comprising,
the device comprises a circular distribution pipe, a main gas inlet pipe, a gas transmission pipeline and a support;
the annular distribution pipe is radially inwards provided with a gas transmission pipeline fixedly connected with the tower body, the gas transmission pipeline is provided with a plurality of gas transmission pipelines which are uniformly distributed along the circumferential direction of the distribution pipe, and the radial outwards-facing part of the distribution pipe is provided with a main gas inlet pipe.
2. The uniform air intake apparatus of a desulfurization tower of claim 1,
the gas transmission pipeline comprises a pipe head arranged on the distribution pipe, a connecting pipe and an expanding pipe fixedly arranged on the tower body, and the two ends of the connecting pipe are fixedly connected with the pipe head and the expanding pipe through flanges respectively.
3. The uniform air intake apparatus of a desulfurization tower of claim 1,
the support includes the brace table, and the brace table upper end has the recess, and installation lower fixing ring in the recess, upper fixing ring is connected to lower fixing ring fixed connection, and upper and lower fixing ring surrounds the staple bolt that forms and is used for fixed distribution pipe, and the staple bolt passes through bolt and brace table fixed connection.
4. A flow field simulation experiment system of a desulfurizing tower is characterized by comprising,
the tower body is provided with a flue gas inlet, and a slurry pool, an inlet flue section, a spraying layer and an outlet flue section are sequentially arranged in the tower body from bottom to top.
A control system which comprises a fan connected with the flue gas inlet through a connecting pipe A, wherein the connecting pipe A is provided with a valve A and a flue gas flowmeter,
a circulating slurry pump communicated with the slurry pool through a connecting pipe B, the circulating slurry pump is connected to the spraying layer through a connecting pipe C, a slurry flowmeter and a valve B are arranged on the connecting pipe C,
the controller, the computer, the valve A, the valve B, the flue gas flowmeter, the slurry flowmeter and the circulating slurry pump are electrically connected, and the inlet face and the outlet face of the spraying layer are provided with pressure sampling devices.
5. A simulation method of a flow field of a desulfurizing tower is characterized by comprising the following steps,
firstly, starting a control system, inputting spraying amount in a computer, keeping the spraying amount constant, respectively inputting different speed values into the computer so as to carry out experiments, wherein in the experiment process, pressure sampling is needed,
the pressure sampling process comprises the following steps: taking a plurality of points on the circular cross section of the inlet and the outlet of the spraying layer, wherein the total number of the points is 25, and the pressure value of each point is obtained by the following method: selecting a time interval, collecting a plurality of pressure values of the point in the time interval, and finally calculating the pressure drop delta p of the spraying layer, wherein the output value of the point is the mean value of the pressure values, and the pressure value of the whole section is the mean value of the 25 pressure values, and the pressure drop is equal to the value obtained by subtracting the pressure value of the outlet section from the pressure value of the inlet section of the spraying layer.
Secondly, the velocity value and the corresponding pressure drop value in the step (I) are sorted, and the V-delta p data correspond to each other,
fitting a formula, taking the air inlet speed in the experimental model as the simulated air inlet speed, taking the pressure drop of the spraying layer as the pressure drop of the porous medium,
when a porous medium is used for replacing a spraying layer for simulation, the resistance coefficient of the porous medium needs to be input, the resistance coefficient can be determined by V-delta p data through formula fitting, and in Fluent, the empirical formula for V-delta p fitting is
Where μ is the hydrodynamic viscosity (unit: Pa.s), t is the thickness of the porous medium (unit: m), ρ is the fluid density (unit: kg/m3), C1Is a viscous drag coefficient (unit: 1/m2), C2Is the inertial resistance coefficient (unit: 1/m),
carrying out resistance coefficient C according to the V-delta p data in the step (II)1And C2And (4) solving to finally obtain a complete equation.
And fourthly, formally carrying out Fluent simulation, comprising the following steps:
(1) establishing a desulfurizing tower model: the spray layer is replaced by a porous medium,
(2) the mesh is divided, care is taken to maintain mesh quality,
(3) selecting a model: a standard turbulent flow model is selected and used,
(4) setting a boundary condition: inputting the speed data of the first step by adopting a speed inlet condition; the outlet condition is a pressure outlet; setting up the porous medium, inputting C in step three1And C2The data of the data is transmitted to the data receiver,
(5) adopting a simple algorithm to carry out iterative computation,
(6) selecting a plurality of circular sections in the model, sampling the speed, respectively taking points on inner and outer rings in the section, totaling 25 points to obtain the speed value, calculating the gas distribution uniformity of the whole section after collecting the speed of each point, wherein the uniformity is represented by E, and the formula is as follows:
wherein, ViFor each selected point speed, VaAnd (4) after the sampling of the speed of the single section is finished, continuing to sample the speeds of other sections, and finally drawing a transformation graph of the E value in the tower height direction.
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