CN110909469B - Low-low temperature electric dust collector model selection design device and model selection design method - Google Patents
Low-low temperature electric dust collector model selection design device and model selection design method Download PDFInfo
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Abstract
The invention discloses a type selection design device and a type selection design method for a low-temperature electric precipitator, wherein a round line-plate structure is adopted to replace a needling line-plate model, a numerical model of the low-temperature electric precipitator is established on the basis of the round line-plate structure, the time for predicting the performance of the needling line-plate model low-temperature electric precipitator through numerical simulation is greatly reduced, the numerical simulation is realized to predict the performance of the low-temperature electric precipitator and is directly used for the type selection design of the low-temperature electric precipitator, the problems of large simulation calculation amount and long calculation time consumption of the needling line-plate low-temperature electric precipitator in the prior art are solved through the method, and the direct engineering application of the numerical simulation prediction low-temperature electric precipitator performance technology is realized. The comparison and verification of actual engineering tests prove that the method is a simple and reliable method, can be directly applied to the model selection design of the low-low temperature electric dust collector, and has very important application value.
Description
Technical Field
The invention relates to the technical field of dust removal and purification, in particular to a type selection design device and a type selection design method for a low-low temperature electric dust remover.
Background
In order to improve the environment, the state continuously improves the emission standard of atmospheric pollutants of thermal power plants, and the emission concentration limit value of smoke dust of a chimney is required to be 100mg/m from 2004 3 And the ultra-low emission requires that the smoke emission concentration of the chimney is not higher than 2014Higher than 5mg/m 3 。。
In the face of increasingly strict emission requirements, a new technology of a low-low temperature electric dust remover appears in the field of dust removal. The low-low temperature electric dust remover utilizes a low-temperature coal economizer or an MGGH heat exchanger which takes water as a medium to recover the flue gas waste heat, so that the flue gas temperature is reduced to be below an acid dew point, the working condition flue gas quantity is reduced, and the dust property is changed, thereby improving the performance of the electric dust remover. Compared with the conventional electric dust remover, the low-temperature electric dust remover has the technical advantages of higher dust removal efficiency, obvious energy-saving effect and the like, and is standard configuration equipment for dust removal under the ultralow emission condition of a coal-fired power plant. Before the low-temperature electric dust removal technology is not applied to the coal-fired power plant, the inlet smoke temperature of the conventional electric dust remover is approximately 120-140 ℃, and a large amount of electric dust remover engineering applications exist in the temperature interval, so that performance prediction in the model selection design can be performed by combining modified multi-foundation-odd formula with experience. However, the working temperature of the low-low temperature electric dust collector is mostly about 90 ℃, the smoke temperature is reduced from 120-140 ℃ to 90 ℃, the performance of the electric dust collector is changed, and the corrected electric dust collector is almost independent of an odd formula. Therefore, how to predict the improvement coefficient of the electric dust collector performance under the low-temperature condition in the actual engineering becomes a prominent difficult problem in the design of the electric dust collector engineering model selection.
In the prior art, a numerical simulation method can be adopted to simulate the electric dust removal process, the performance of the electric dust remover is predicted, the difficulty that people are difficult to accurately predict the designed performance of the electric dust remover is solved, and the prediction of volt-ampere characteristics, electric field distribution, back corona formation, dust removal efficiency and corona power of the electric dust remover under different conditions can be realized. Because the pole matching used by the low-temperature electric dust remover for industrial application is mainly a needling line-plate structure, please refer to fig. 1 and fig. 2a, the calculation amount of the numerical simulation prediction performance of the needling line-plate model low-temperature electric dust remover is huge, and the complete simulation calculation of one needling line-plate pole matching type low-temperature electric dust remover needs about four to five months, which is allowed in the mechanism research of the low-temperature electric dust remover, but the engineering design of the low-temperature electric dust remover is unacceptable, the construction period of the low-temperature electric dust remover is often short, and the time left for the model selection design is less than half a month.
Therefore, how to reduce the technical problems of large calculation amount and long calculation time in the numerical simulation of the existing low-low temperature electric dust remover is a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to solve the technical problems of large calculation amount and long calculation time in numerical simulation of low-temperature and low-temperature electric precipitators in the prior art.
In order to solve the technical problems, the invention provides a model selection design method for a low-low temperature electric dust remover, which specifically comprises the following steps:
designing a cathode wire and an anode plate in the low-temperature electric dust collector according to a simulation model to be selected to establish a needling wire-plate model, wherein the needling wire-plate model comprises two electrode plates and at least one needling wire positioned between the two electrode plates, and the needling wire-plate model and the two electrode plates are respectively used for being the same as the cathode wire and the anode plate to be simulated in size and shape;
determining a circular line-plate model equivalent to the needling line-plate model; wherein the voltammetry characteristics of both the circular line-plate model and the needled line-plate model are within a predetermined deviation range under equivalent design parameters; the circular line-plate model comprises two plate bodies and a cylinder positioned between the two plate bodies, and the outer surface of the cylinder is cylindrical; the volt-ampere characteristic is a change relation of current with voltage;
replacing a cathode wire in the design to be selected with a cylinder in the circular wire-plate model, and establishing a numerical model of the low-low temperature electric dust collector;
inputting design parameters to the established numerical model of the low-low temperature electric dust remover to obtain the corresponding dust removal efficiency of the low-low temperature electric dust remover;
and taking the obtained dust removal efficiency of the low-temperature electric dust remover as a model selection design basis.
Firstly, establishing a needling line-plate model based on a cathode line and an anode plate in a low-low temperature electric precipitator to be designed, wherein the needling line and the anode plate in the needling line-plate model are respectively the same as the cathode line and the anode plate in the low-low temperature electric precipitator in size and shape; then determining a circular line-plate model equivalent to the needling line-plate model according to the condition that the volt-ampere characteristics are basically the same; and then replacing the pricked wires in the pricked wire-plate model with the round wires in the round wire-plate model to establish a numerical model of the low-low temperature electric dust remover.
Because the circular line-plate model is a two-dimensional electric field, the number of grids is less than 1% of the number of grids of the three-dimensional electric field of the needling line-plate model, the calculation time is 5% of that of the needling line-plate model, the time for predicting the performance of the needling line-plate model electric dust remover through numerical simulation is greatly reduced, and the purpose of predicting the performance of the electric dust remover at low temperature through numerical simulation directly used for the model selection design of the electric dust remover at low temperature is achieved.
The method solves the problems of large simulation calculation amount and long calculation time consumption of the needling line-plate model low-temperature electric dust remover in the prior art, and realizes the direct engineering application of the numerical simulation prediction low-temperature electric dust remover performance technology. Through equivalent numerical simulation, the overall dust removal efficiency and the approach speed of the low-low temperature electric dust remover are predicted, and the dust classification dust removal efficiency, the dust removal efficiency of PM2.5 which is focused by ultralow emission and the performance improvement coefficient of the low-low temperature electric dust remover are obtained. The method is provided based on the principle of consistency of relative change trend of the basis of electric precipitation mechanism, the equivalence is carried out by considering the application characteristics of engineering, and the comparison and verification of actual engineering tests prove that the method is a simple and reliable method, can be directly applied to the model selection design of the low-low temperature electric precipitator, and has very important application value.
Alternatively to this, the first and second parts may,
the number of the needling lines between the two polar plates in the needling line-plate model is 1 to 3;
the round wire-plate model is obtained by:
firstly, acquiring the volt-ampere characteristic of the acupuncture line-plate model; then establishing an initial circular line-plate structure model, and then according to a formula
Adjusting the surface roughness coefficient m and the circle of the cylinder in the initially established circular line-plate modelThe radius r of the peripheral surface of the cylinder is set so that the volt-ampere characteristics of the circular line-plate model and the volt-ampere characteristics of the acupuncture line-plate model are within a preset deviation range under the equivalent design parameters;
wherein E is 0 Representing the field intensity of the corona onset with the unit of V/m; δ represents a relative density equal in magnitude to the ratio of the actual state gas density to the standard state density; m is the surface roughness coefficient of the acupuncture line or the cylinder, and the value of m is less than 1; r is the radius of curvature of the tip of the needle-punched wire or the outer diameter of the cylinder.
Optionally, by adjusting the surface roughness coefficient m of the cylinder and the radius r of the cylinder, the voltage-current characteristic curve of the circular line-plate model substantially coincides with the voltage-current characteristic curve of the acupuncture line-plate model.
Optionally, when the m and r are adjusted by obtaining the circular line-plate model, the following conditions are satisfied in addition to the voltammetry characteristics: the dust removal efficiency of the circular line-plate model and the dust removal efficiency of the needling line-plate model are within a preset numerical range.
Optionally, the line plate distance and the adjacent corona wire distance in the circular line-plate model are respectively equal to the line plate distance and the adjacent corona wire distance of the needling line-plate model.
Optionally, the specific content of the model selection design of the low-low temperature electric dust collector includes:
and when the obtained dust removal efficiency of the low-temperature electric dust remover is smaller than a preset efficiency value, adjusting the temperature of a flue gas inlet or/and the dust collection area until the dust removal efficiency of the low-temperature electric dust remover is equal to or larger than the preset efficiency value.
Optionally, the design parameters at least include parameters such as dust concentration, dust particle size, dust component, flue gas inlet temperature, flue gas flow, flue gas water content, dust collection area, and the like.
In addition, the invention also provides a low-low temperature electric dust remover model selection design device which comprises a control part and a display interface, wherein the control part is internally provided with any one of the low-low temperature electric dust remover model selection design methods, the display interface can be communicated with the control part, and the control part can at least display the dust removal efficiency of the low-low temperature electric dust remover on the display part.
Optionally, a design parameter input window is further arranged on the display interface, and the design parameter includes one or more of dust concentration, dust particle size, dust component, flue gas inlet temperature, flue gas flow, flue gas water content, and dust collection area.
The device of the invention integrates the model selection design method, so the device also has the technical effects of the model selection design method.
Drawings
FIG. 1 is a schematic view of a partial structure of a needle-punched cathode wire in the prior art;
FIG. 2a is a schematic diagram of a needle punching-type plate structure in the prior art;
FIG. 2b is a cross-sectional view of a round wire-plate structure provided by the present invention;
FIG. 3 is a schematic diagram of a simulated partial grid of a needled thread-plate model;
FIG. 4 is a schematic diagram of a simulated partial mesh of a circular line-plate model in an embodiment of the present invention.
FIG. 5 is a graph showing the volt-response curves of the circular wire-plate structure and the needlepunch-plate model in one embodiment of the present invention;
FIG. 6 is a flow chart of a design method for the model selection of the electric precipitator with low and medium temperature in a specific mode of the present invention;
FIG. 7 is a graph illustrating the movement of dust particles between two dust plates prior to modification in an embodiment of the present invention;
FIG. 8 is a graph showing the movement of dust particles between two dust plates after modification in accordance with one embodiment of the present invention;
FIG. 9 is a schematic view of the particle size distribution of the inlet and outlet before and after the equipment is modified according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of the dust removal efficiency before and after the modification of the apparatus according to an embodiment of the present invention.
In fig. 1 and 2, reference numerals are illustrated as follows:
10-round line-plate model; 11-a plate body; 12-a cylinder;
20-needling the thread; 21-a polar body; 22-polar needle.
Detailed Description
Aiming at the technical problems of large calculation amount and long calculation time in the numerical simulation of the low-low temperature electric dust remover in the prior art, the application carries out deep research and finds that the main reasons for causing the technical problems are as follows:
first, the number of grids is large. Referring to fig. 3, the needle-punched line-plate type is a three-dimensional structure, and the size of the needle tip is very small and in the micron size, so that in order to ensure the calculation quality, a local area near the needle tip needs to be extremely dense grids, and the number of the whole space grids is large. Generally, the number of local area grids of a single needle is about one million, while the number of acupuncture lines in a single channel of a single electric field can reach hundreds, and the number of calculation grids is very large.
Secondly, the simulation model is complex. Numerical simulation of an electric precipitator involves numerous equations such as electric field, air flow motion, particle charge, particle motion, and the like. On one hand, the processes are mutually coupled, so that the convergence speed is low, and the iteration times are more; on the other hand, data needs to be frequently called among all submodels, and the calculation speed is reduced.
In order to solve at least one of the above technical problems, the present invention proposes a specific technical solution.
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail with reference to a model selection design method, a model selection design device, a drawing, and specific embodiments.
Referring to fig. 2b, fig. 4, fig. 5 and fig. 6, the invention provides a type selection design method for a low-low temperature electric precipitator, which is mainly applied to improve the existing electric precipitator into the low-low temperature electric precipitator, wherein the temperature of a flue gas inlet in the low-low temperature electric precipitator is lower than that of a common electric precipitator, and the temperature of the flue gas inlet in the low-low temperature electric precipitator is approximately 85-95 ℃.
The type selection design method of the low-temperature electric dust remover specifically comprises the following steps:
s1, designing a cathode wire and an anode plate in a low-temperature electric precipitator according to a simulation model to be selected to establish a needling wire-plate model, wherein the needling wire-plate model comprises two electrode plates and at least one needling wire 20 positioned between the two electrode plates, and the two are respectively used for a round wire-plate model 10 which is the same as the cathode wire and the anode plate to be simulated in size and shape;
that is, the punched lines 20 in the punched line-plate model have the same size and shape as the anode plate and cathode line, respectively, they simulate. In a preferred embodiment, the number of needle lines 20 between the two plates in the needle line-plate model may be relatively small, and it is preferred herein that the number of needle lines between the two plates is 1 to 3.
S2, determining a circular line-plate model equivalent to the needling line-plate model; wherein under the same design parameters, the volt-ampere characteristics of the circular line-plate model and the needling line-plate model are within a preset deviation range; the circular line-plate model comprises two plate bodies 11 and a cylinder 12 positioned between the two plate bodies, wherein the outer surface of the cylinder 12 is cylindrical; the current-voltage characteristic is a current-voltage variation.
The size and shape of the plate body 11 in the round wire-plate model are preferably the same as those of the dust collecting plate in the low-low temperature electric dust collector.
Inputting design parameters such as voltage, smoke temperature and the like in the needling line-plate model and the circular line-plate model respectively; and performing analog calculation, outputting the current-voltage characteristics of the two and comparing the current-voltage characteristics. And adjusting parameters such as the diameter and the surface roughness of a cylinder in the circular wire-plate model according to the volt-ampere characteristics of the acupuncture wire-plate model, so that the volt-ampere characteristics of the circular wire-plate model and the volt-ampere characteristics of the acupuncture wire-plate model are within a preset deviation range, and determining the circular wire-plate model at the moment.
As mentioned above, the needle stick thread-plate model herein mainly includes a needle stick thread 20 and a pole plate, the needle stick thread 20 further includes a pole thread body 21, at least one pole needle 22, the pole needle 22 extends radially outward from the outer surface of the pole thread body 21, and the tip of the pole needle 22 is generally in the shape of a needle tip, and is also called needle stick. The number of the needle lines may be one or two or more, and is not limited herein. When in use, the polar line body 21 is connected with the negative pole of the power supply, and the dust collecting plate is connected with the positive pole of the power supply.
The specific shapes of the polar body 21 and the polar needle 22 are not limited herein. The polar body 21 may have a cylindrical surface on which the polar pins 22 are distributed. Of course, the shapes of the polar body 21 and the polar needle 22 are not limited to the above description, and for the simplicity of describing the technical solution, the polar body 21 is taken as a cylinder as an example for description.
The plate body in the round wire-plate model 10 and the polar plate in the needling wire-plate model can be the same in size and shape; and the distance between the wire plates and the distance between the adjacent corona wires in the circular wire-plate model 10 are respectively consistent with the distance between the wire plates and the distance between the adjacent corona wires of the acupuncture wire-plate model.
The pitch of the wire plates refers to the distance from the central line of the needle-punched wire to the polar plate or the distance from the central line of the cylinder to the plate body.
Theoretically, the volt-ampere characteristics of the circular line-plate model 10 and the volt-ampere characteristics of the needling line-plate model are the same and optimal, but a predetermined deviation between the circular line-plate model 10 and the needling line-plate model in the low-temperature electric precipitator to be type-designed can be allowed on the premise of not influencing the subsequent type selection design of the low-temperature electric precipitator, namely, the volt-ampere characteristics of the circular line-plate model 10 and the needling line-plate model in the low-temperature electric precipitator to be type-designed are within a predetermined deviation range, the predetermined deviation range can be reasonably selected according to actual simulation accuracy, and the predetermined deviation range is not disclosed herein, and the understanding and implementation of the technical scheme of the present document by a person skilled in the art are not influenced.
Preferably, when determining the circular line-plate model, the following conditions are satisfied in addition to that the current-voltage characteristics are within a predetermined deviation range: the dust removal efficiency of the circular line-plate model and the dust removal efficiency of the needling line-plate model are within a preset numerical range.
S3, replacing a cathode line in the design to be selected with a cylinder in the circular line-plate model, and establishing a numerical model of the low-low temperature electric dust collector;
that is, the cathode lines between the dust collecting plates are replaced by cylinders in the numerical modeling of the low-low temperature electric dust collector, and a two-dimensional numerical simulation model is established.
S4, inputting design parameters to the established numerical model of the low-low temperature electric dust remover to obtain the dust removal efficiency eta of the corresponding low-low temperature electric dust remover; and taking the obtained dust removal efficiency eta of the low-temperature electric dust remover as a model selection design basis.
And adjusting the design parameters of the low-temperature electric dust remover according to the obtained eta so that the eta meets the requirement.
The design parameters in the text are parameters of dust concentration, dust particle size, dust component, flue gas inlet temperature, flue gas flow, flue gas water content, dust collection area and the like. The main parameters to be adjusted are dust collecting area A and flue gas inlet temperature T.
Firstly, establishing a needling line-plate model by taking a cathode line and an anode plate in a low-low temperature electric dust remover to be selected as a basis, wherein the needling line and the anode plate in the needling line-plate model are respectively the same as the cathode line and the anode plate in the low-low temperature electric dust remover in size and shape; then determining a circular line-plate model equivalent to the needling line-plate model according to the condition that the volt-ampere characteristics are basically the same; and then replacing the pricked wires in the pricked wire-plate model with the round wires in the round wire-plate model to establish a numerical model of the low-low temperature electric dust remover.
The circular line-plate model 10 is a two-dimensional electric field, the number of grids is less than 1% of the number of the three-dimensional electric field grids of the needling line-plate model, the calculation time is 5% of that of the needling line-plate model 20, the time for predicting the performance of the needling line-plate model low-temperature electric dust remover through numerical simulation is greatly reduced, and the purpose of predicting the performance of the low-temperature electric dust remover through numerical simulation is achieved and directly used for the model selection design of the low-temperature electric dust remover.
The method solves the problems of large simulation calculation amount and long calculation time consumption of the needling line-plate model low-temperature electric dust remover in the prior art, and realizes the direct engineering application of the numerical simulation prediction low-temperature electric dust remover performance technology. Through equivalent numerical simulation, the overall dust removal efficiency and the approach speed of the low-low temperature electric dust remover are predicted, and the dust classification dust removal efficiency, the dust removal efficiency of PM2.5 which is focused by ultralow emission and the performance improvement coefficient of the low-low temperature electric dust remover are obtained. The method is provided based on the principle of consistency of relative change trend of the basis of electric precipitation mechanism, the equivalence is carried out by considering the application characteristics of engineering, and the comparison and verification of actual engineering tests prove that the method is a simple and reliable method, can be directly applied to the model selection design of the low-low temperature electric precipitator, and has very important application value.
In a particular embodiment, the round wire-plate model 10 is obtained by:
s11, establishing a three-dimensional numerical simulation model of the needling line-plate model containing 1-3 polar lines for numerical calculation, and acquiring the volt-ampere characteristic of the needling line-plate model 20;
s12, establishing an initial circular line-plate structure model and then according to a formula
And adjusting the surface roughness coefficient m of the cylinder and the radius r of the peripheral surface of the cylinder in the initially established circular line-plate model so that the volt-ampere characteristic of the circular line-plate model and the volt-ampere characteristic of the acupuncture line-plate model are within a preset deviation range under the equivalent design parameters.
Wherein E is 0 Expressing the field intensity of the corona onset in the unit of V/m (the Chinese unit is volt/meter); δ represents a relative density equal in magnitude to the ratio of the actual state gas density to the standard state density; the standard state is a standard state, and refers to a state condition with the temperature of 0 ℃ and the pressure of 1 atmosphere; m is the surface roughness coefficient of polar line or circular line, and the value of m is less than 1; r is the radius of curvature of the tip of the needle or the outer diameter of the cylinder.
The method for determining the specific structural parameters of the circular line-plate structure 10 through the above equation is simple and easy to implement and has high accuracy.
In this preferred embodiment, the current-voltage characteristic curve of the circular line-plate model 10 substantially coincides with the current-voltage characteristic curve of the acupuncture line-plate model 20 model by adjusting the surface roughness coefficient m and the radius r of the cylinder.
In the above embodiment, when the circular line-plate model 10 is obtained to adjust m and r, the following conditions are satisfied in addition to the voltammetry characteristics: the dust removal efficiency of the round wire-plate model 10 and the dust removal efficiency of the needle punched wire-plate model are within a preset numerical range.
The dust removal efficiency of the round wire-plate model 10 can be obtained from the low-low temperature electric dust removal numerical model.
Thus, the volt-ampere characteristics and the dust removal efficiency of the round wire-plate model 10 and the needling wire-plate model are basically the same, and the equivalence of the two models is improved.
Practice proves that if the volt-ampere characteristics of the circular line-plate model 10 and the needling line-plate model are only guaranteed to be within a preset deviation, the deviation of the dust removal efficiency of the circular line-plate model 10 and the needling line-plate model is not higher than three percent, and the requirement of subsequent simulation model selection design can be met.
In the above embodiments, the main parameters in the model selection design of the low-low temperature electric precipitator are the dust collection area a and the flue gas inlet temperature T, and the specific contents include:
when the dust removal efficiency of the low-temperature electric dust remover is less than a preset efficiency value, adjusting the temperature of a flue gas inlet or/and the dust collection area A until the dust removal efficiency of the low-temperature electric dust remover is equal to or greater than the preset efficiency value.
In addition, the invention also provides a low-low temperature electric dust remover model selection design device which comprises a control part and a display interface, wherein the control part is internally provided with the low-low temperature electric dust remover model selection design method in any embodiment, the display interface can be communicated with the control part, and the control part can at least display the dust removal efficiency of the low-low temperature electric dust remover on the display part.
Specifically, the display interface is further provided with a design parameter input window, and the design parameters comprise one or more of dust concentration, dust particle size, dust components, flue gas inlet temperature, flue gas flow, flue gas water content and dust collection area.
The control part can be a controller of a computer, and a low-low temperature electric dust remover model selection design method is integrated in the controller. The display interface can be a display screen of a computer.
Taking a certain electric dust collector transformation project as an example, the flue gas inlet temperatures of the electric dust collector before and after transformation are respectively 125 ℃ and 93 ℃, and the performance of the electric dust collector is numerically simulated according to design parameters, so that when the flue gas inlet temperature is 125 ℃, the dust removal efficiency is 99.368 percent, and the driving speed is 4.819cm/s. The inlet temperature of the flue gas is changed to 93 ℃, the dedusting efficiency is 99.845%, the driving speed is 5.658cm/s, and the improvement coefficient of the driving speed after low-temperature and low-temperature transformation is predicted to be 1.174. Wherein the driving speed refers to the speed of the charged particles moving to the dust collecting electrode.
The simulation also can obtain the motion tracks of the dust particles at the flue gas inlet temperature of 125 ℃ and 93 ℃ as shown in fig. 7 and 8, the track of the dust particles at 93 ℃ is thinner than 125 ℃, which shows that more particles are collected at 93 ℃ and the dust removal efficiency is higher.
In addition, the simulation also obtains the particle size distribution of the inlet and the outlet of the electric dust remover and the dust classification dust removal efficiency when the temperature of the flue gas inlet is 125 ℃ and 93 ℃, and the detailed results are shown in fig. 9 and fig. 10. The dust classification and dust removal efficiency is approximately U-shaped, and the dust classification and dust removal efficiency at 93 ℃ is higher than the dust classification and dust removal efficiency at 125 ℃.
Simulating to obtain the dust removal efficiency of the PM10 and the PM2.5 of 96.626 percent and 88.617 percent when the temperature of the flue gas inlet is 125 ℃; when the temperature of the flue gas inlet is 93 ℃, 99.174% and 97.176% of PM10 and PM 2.5.
Testing the performance of the electric dust collector when the temperature of the flue gas inlet before modification is 125 ℃ to obtain the flue gas volume of 1529090m 3 H, dust concentration 12.2g/Nm 3 Specific dust collecting area of 105.1m 2 /m 3 The dust removal efficiency is 99.432 percent, and the advancing speed is 4.921cm/s. Testing the performance of the electric precipitator when the temperature of the modified flue gas inlet is 93 ℃ to obtain the flue gas amount of 1381681m 3 H, dust concentration 12.2g/Nm 3 Specific dust collecting area of 116.4m 2 /m 3 The dust removal efficiency is 99.864 percent, and the advancing speed is 5.670cm/s.
Table 1 shows the comparison of the test results and simulation results of the low-low temperature electrostatic precipitator before and after the transformation. As can be seen from the table, the simulated value of the dust removal efficiency at the flue gas inlet temperature of 125 ℃ and 93 ℃ is close to the test value. When the temperature of the flue gas inlet is reduced to 93 ℃ from 125 ℃, the improvement coefficient of the advancing speed w obtained through simulation is 1.174, the improvement coefficient of the advancing speed w obtained through test is 1.152, the simulated improvement coefficient of the advancing speed is close to the test value, the relative deviation is about-1.91 percent, and the simulation result can be well applied to engineering model selection design and modification. Because the dust removal performance of the equivalent circular line-plate structure 10 and the dust removal performance of the needling line-plate model 20 have the consistency of relative change trend, the dust removal performance of the needling line-plate model 20 can be accurately simulated by applying the equivalent circular line-plate model 10.
Table 1 comparison of test results and simulation results of low-low temperature electrostatic precipitator before and after modification
The equivalent method simulates and predicts the performance cycle of the low-temperature and low-temperature electric dust collector for about 7 to 10 days, greatly shortens the time consumption compared with the direct simulation of a needling line-plate model, and is suitable for engineering model selection design. Through comparison and verification of a large number of practical engineering tests, the method is proved to be a reliable and effective method for the model selection design of the low-low temperature electric dust remover, and can be popularized and applied to the model selection design of the low-low temperature electric dust remover.
Since the device of the present invention integrates the above-mentioned model selection design method, the device also has the above-mentioned technical effects of the model selection design method.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (9)
1. A type selection design method for a low-low temperature electric dust collector is characterized by comprising the following steps:
designing a cathode wire and an anode plate in the low-temperature electric dust collector according to a simulation model to be selected to establish a needling wire-plate model, wherein the needling wire-plate model comprises two electrode plates and at least one needling wire positioned between the two electrode plates, and the size and the shape of the needling wire-plate model are respectively the same as those of the cathode wire and the anode plate to be simulated;
determining a circular line-plate model equivalent to the needling line-plate model; wherein the voltammetric characteristics of both the circular line-plate model and the needled line-plate model are within a predetermined deviation range under equivalent design parameters; the circular line-plate model comprises two plate bodies and a cylinder positioned between the two plate bodies, and the outer surface of the cylinder is cylindrical; the volt-ampere characteristic is a change relation of current with voltage;
replacing a cathode wire in the design to be selected with a cylinder in the circular wire-plate model, and establishing a numerical model of the low-low temperature electric dust collector;
inputting design parameters to the established numerical model of the low-low temperature electric dust remover to obtain the corresponding dust removal efficiency of the low-low temperature electric dust remover;
taking the obtained dust removal efficiency of the low-temperature electric dust remover as a model selection design basis;
the round wire-plate model is obtained by:
firstly, acquiring the volt-ampere characteristic of the acupuncture line-plate model; then establishing an initial circular line-plate structure model, and then according to a formula
Adjusting the surface roughness factor of a cylinder in an initial circular line-plate modelmAnd a radius r of the outer circumferential surface of the cylinder such that the current-voltage characteristic of the circular line-plate model and the current-voltage characteristic of the needlepunch line-plate model are within a predetermined deviation range under equivalent design parameters;
wherein E is 0 Representing the initial corona field strength with the unit of V/m;
representing the relative density, which is equal to the ratio of the actual state gas density to the standard state density; m is the surface roughness coefficient of the acupuncture line or the cylinder, and the value of m is less than 1; r is the radius of curvature of the tip of the needle-punched wire or the outer diameter of the cylinder.
2. The type selection design method for the low-low temperature electric dust collector as claimed in claim 1, wherein the number of the needling lines between the two pole plates in the needling line-plate model is 1 to 3.
3. The type selection design method of the low-low temperature electric dust remover as claimed in claim 2, wherein the surface roughness coefficient of the cylinder is adjustedmAnd the radius r of the cylinder, wherein the volt-ampere characteristic curve of the circular line-plate model is basically coincident with the volt-ampere characteristic curve of the acupuncture line-plate model.
4. The type selection design method for the low and low temperature electric dust collector as claimed in any one of claims 2 to 3, wherein when the m and r are adjusted by obtaining the circular line-plate model, the following conditions are satisfied in addition to the volt-ampere characteristics: the dust removal efficiency of the circular line-plate model and the dust removal efficiency of the needling line-plate model are within a preset numerical range.
5. The model selection design method for the low and low temperature electric dust collector as claimed in claim 1, wherein the line plate pitch and the adjacent corona wire pitch in the circular line-plate model are respectively consistent with the line plate pitch and the adjacent corona wire pitch in the needling line-plate model.
6. The type selection design method of the low-low temperature electric dust remover as claimed in claim 1, wherein the specific content of the type selection design of the low-low temperature electric dust remover comprises:
when the dust removal efficiency of the low-temperature electric dust remover is less than the preset efficiency value, the temperature of the flue gas inlet or/and the dust collection area are adjusted until the dust removal efficiency of the low-temperature electric dust remover is equal to or greater than the preset efficiency value.
7. The type selection design method of the low and low temperature electric dust collector as claimed in claim 1, wherein the design parameters at least comprise one or more of dust concentration, dust particle size, dust composition, flue gas inlet temperature, flue gas flow rate, flue gas water content and dust collection area.
8. The low-low temperature electric dust remover model selection design device is characterized by comprising a control component and a display interface, wherein the control component is internally provided with the low-low temperature electric dust remover model selection design method according to any one of claims 1 to 7, the display interface can be communicated with the control component, and the control component can display the dust removal efficiency of the low-low temperature electric dust remover on the display interface.
9. The type-selecting design device of the low-low temperature electric dust remover as claimed in claim 8, wherein a design parameter input window is further arranged on the display interface, and the design parameters comprise one or more of dust concentration, dust particle size, dust composition, flue gas inlet temperature, flue gas flow, flue gas water content and dust collection area.
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