CN110652815B - Sound wave dust removal method for cooperatively controlling smoke suspended particles through sound field test and simulation - Google Patents
Sound wave dust removal method for cooperatively controlling smoke suspended particles through sound field test and simulation Download PDFInfo
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Abstract
The invention discloses a sound wave dust removal method for cooperatively controlling suspended particles in flue gas through sound field testing and simulation, which comprises a sound wave dust removal device consisting of a plurality of device parts; the device components are mainly sound sources and waveguides; under the action of sinusoidal voltage signals with controllable input frequency, voltage amplitude and phase difference among the sound sources, the sound sources can radiate a plurality of sound waves to the inner space of the device, so that specific sound field distribution is formed in the device; the sound field distribution appears as a composite sound field having antinodes and nodes; the flue gas suspended particles in the device are subjected to the action processes of migration, mixing, collision, agglomeration, separation, growth or removal and the like under the action of specific sound field distribution. The invention realizes that the equipment operation condition and the regulation and control parameters of the target sound field distribution characteristics are quickly obtained by using a computer sound field simulation method on the premise of reducing the complexity of the test process, thereby obtaining the optimal particle control effect corresponding to the target sound field distribution characteristics.
Description
Technical Field
The invention relates to a sound wave dust removal method for smoke suspended particles through sound field testing and simulation cooperative control, and belongs to the field of engineering thermophysics and energy utilization.
Background
A large number of particle manipulation technologies with different sizes of a plurality of nanometer, micrometer, millimeter, centimeter and other particle diameters have potential research values for promoting the occurrence, development and change of behavior processes such as migration, mixing, collision, agglomeration, separation, growth, removal and the like of small particles in a gas medium, and the particle manipulation technologies can be obviously applied to manipulation, removal and collection of suspended particles in industries such as coal-fired power plants, smelting, chemical industry, powder pharmaceutical industry and the like.
At present, with the gradual enhancement of the attention degree of people to the control of atmospheric pollutants such as fossil fuel requirements and haze, the guarantee of human health and the safety of environmental quality, the PM2.5 control has become an important scientific and technical problem concerned by the research and development of flue gas pollutant systems of coal-fired power plants.
The acoustic wave dust removal technology is taken as a leading development direction of combustion source PM2.5 control research, and the challenges of variability and complexity of equipment operation conditions and regulation parameters are faced.
Disclosure of Invention
The purpose of the invention is as follows: the technical problem to be solved by the invention is to provide a sound wave dust removal technology capable of effectively regulating and controlling the running state of equipment, and the technology is combined with a sound field simulation and test method to cooperatively control the occurrence, development and change of behavior processes such as migration, mixing, collision, agglomeration, separation, growth, removal and the like of smoke suspended particles.
In order to solve the technical problems, the technical means adopted by the invention is as follows:
a sound field test and simulation cooperate to control the dust collection method of sound wave of the suspended particle of the flue gas, including the sound wave dust collector composed of multiple apparatus parts; the device components are mainly sound sources and waveguides; under the action of sinusoidal voltage signals with controllable input frequency and voltage amplitude, a plurality of sound sources can radiate a plurality of sound waves to the inner space of the device, so that specific sound field distribution is formed in the device; the sound field distribution appears as a composite sound field having antinodes and nodes; the flue gas suspended particles in the device are subjected to the action processes of migration, mixing, collision, agglomeration, separation, growth or removal and the like under the action of specific sound field distribution; the flue gas consists of a gaseous medium and suspended particles.
The first step is as follows: aiming at various smoke conditions and various arrangement methods and operation parameters of device components, firstly, an acoustic simulation method is adopted to obtain a simulation result of sound field distribution in the device under various conditions;
the second step is that: the method comprises the steps that the sound field distribution of the inner space of the device is presented as obvious fluctuation characteristics at different positions to serve as a judgment basis, and the arrangement method and the operation parameters (the operation number, the arrangement position, the input frequency, the input voltage amplitude, the phase position of input voltage among different sound sources and the like) of device parts (such as sound sources) are preliminarily drawn up;
the third step: aiming at the planned device component arrangement method and operation parameters, a test method is adopted to obtain a test result of sound field distribution, and the arrangement method and the operation parameters of the device components are selected after the test result is compared and corrected with a simulation result.
Preferably, the sound field distribution is represented by a spatial-temporal distribution of instantaneous sound pressures at a plurality of locations within the apparatus. The mathematical description basis of the control equation of the acoustic simulation method comprises an acoustic wave equation; the mathematical description of the boundary conditions of the acoustic simulation method is based on the characteristics of sound waves radiated by sound sources and the boundary characteristics between two adjacent sound sources.
Preferably, the sound source is a Helmholtz sound source; a plurality of Helmholtz acoustic sources are arranged symmetrically around the waveguide. The waveguide may be composed of a plurality of boundary surfaces where physical shapes are arranged between sound sources, may be composed of a boundary surface where no physical shape is arranged between sound sources, or may be composed of a plurality of boundary surfaces where physical shapes are arranged between sound sources and a boundary surface where no physical shape is arranged.
Preferably, the sound source is provided with a control bracket capable of changing the position thereof for adjusting the arrangement position of the device component.
Preferably, a plurality of temperature sensors are arranged inside the device for measuring the temperature of the gaseous medium and the device components; when the smoke condition changes, the measured temperature parameters are used for correcting the sound field distribution simulation result, and then the arrangement method and the operation parameters of the device components are reselected.
The method has the advantages that the method combining simulation and experiment is adopted, sound field distribution of the whole space in the device under various conditions is obtained through computer simulation, after the authenticity of the simulated sound field distribution is verified through a small number of characteristic position sound field test points, the sound field distribution of the inner space of the device is presented as obvious fluctuation characteristics at different positions to serve as a judgment basis, and an ideal device component arrangement method and operation parameters are obtained. The technology realizes that the equipment running condition and the regulation and control parameters of the target sound field distribution characteristics are quickly obtained by using a computer sound field simulation method on the premise of reducing the complexity of the test process, and further, the optimal particle control effect corresponding to the target sound field distribution characteristics is obtained.
Drawings
FIG. 1 is a schematic view of an acoustic dust collector of the present invention;
FIG. 2 is a schematic diagram of a Helmholtz sound source of a sound source according to an embodiment of the present invention;
FIG. 3 is a schematic view of a regular hexahedral waveguide that is a waveguide according to an embodiment of the present invention;
fig. 4 is a schematic illustration of a waveguide without physical shapes, in accordance with an embodiment of the present invention.
Detailed Description
The invention will be better understood from the following examples. However, those skilled in the art will readily appreciate that the description of the embodiments is only for illustrating the present invention and should not be taken as limiting the invention as detailed in the claims.
As shown in fig. 1, the sound wave dust removing method for the sound field test and simulation cooperative manipulation of the smoke suspended particles of the invention comprises a sound wave dust removing device 1 consisting of a plurality of device components; the device components are mainly the sound source 2 and the waveguide 3; under the action of a sinusoidal voltage signal with controllable input frequency and voltage amplitude, a plurality of sound sources 2 can radiate a plurality of sound waves to the inner space of the device, so that a specific sound field distribution is formed in the device; the sound field distribution appears as a composite sound field having antinodes and nodes; the flue gas suspended particles in the device are subjected to the action processes of migration, mixing, collision, agglomeration, separation, growth or removal and the like under the action of specific sound field distribution; the flue gas consists of a gaseous medium and suspended particles.
The first step is as follows: aiming at various smoke conditions and various arrangement methods and operation parameters of device components, firstly, an acoustic simulation method is adopted to obtain a simulation result of sound field distribution in the device under various conditions;
the second step is that: the method comprises the steps that the sound field distribution of the inner space of the device is presented as obvious fluctuation characteristics at different positions to serve as a judgment basis, and the arrangement method and the operation parameters (the operation number, the arrangement position, the input frequency, the input voltage amplitude, the phase position of input voltage among different sound sources and the like) of device parts (such as sound sources) are preliminarily drawn up;
the third step: aiming at the planned device component arrangement method and operation parameters, a test method is adopted to obtain a test result of sound field distribution, and the arrangement method and the operation parameters of the device components are selected after the test result is compared and corrected with a simulation result.
The sound field distribution is represented by a spatio-temporal distribution of instantaneous sound pressures at a plurality of locations within the device. The mathematical description basis of the control equation of the acoustic simulation method comprises an acoustic wave equation; the mathematical description of the boundary conditions of the acoustic simulation method is based on the characteristics of sound waves radiated by sound sources and the boundary characteristics between two adjacent sound sources.
The sound source 2 is a Helmholtz sound source; a plurality of Helmholtz acoustic sources are arranged symmetrically around the waveguide. The waveguide may be composed of a plurality of boundary surfaces where physical shapes are arranged between sound sources, may be composed of a boundary surface where no physical shape is arranged between sound sources, or may be composed of a plurality of boundary surfaces where physical shapes are arranged between sound sources and a boundary surface where no physical shape is arranged.
The sound source 2 is provided with a regulation and control support capable of changing the position of the sound source, the arrangement position of the adjusting device component is used for allowing the sound source 2 to be adjusted randomly in the three dimensional directions of a Cartesian rectangular coordinate system, a cylindrical coordinate system or a spherical coordinate system in the space.
A plurality of temperature sensors are arranged inside the device and used for measuring the temperature of the gas medium and the device components; when the smoke condition changes, the measured temperature parameters are used for correcting the sound field distribution simulation result, and then the arrangement method and the operation parameters of the device components are reselected.
Fig. 2 is a schematic diagram of a Helmholtz sound source of a sound source according to an embodiment of the present invention, where the Helmholtz sound source includes a through hole 2-1, a cavity 2-2, and a speaker diaphragm 2-3, which form a Helmholtz resonator structure.
The input frequency of the sound source 2 when in operation is equal to the resonance frequency of the Helmholtz resonator. The distance between a group of opposite acoustic sources 2 is such that the waveguide can approximately achieve an nth order resonance in the opposite direction when the acoustic sources 2 operate at the resonance frequency of the Helmholtz resonator.
In addition, for the function of the temperature sensor, when the temperature of the environment where the Helmholtz sound source is located changes, the resonance frequency of the Helmholtz resonator changes due to the corresponding change relationship between the temperature and the sound velocity; if the Helmholtz sound source still works according to the input frequency before the temperature change, the amplitude of the sound pressure radiated by the sound source is reduced, and the fluctuation intensity of the sound field distribution in the device is further weakened, so that the arrangement method and the operation parameters of the device components need to be reselected. Notably, the shape of the spatial structure of the waveguide is defined by the arrangement positions of all the operating sound sources.
Fig. 3 is a regular hexahedral-shaped waveguide of a waveguide according to an embodiment of the present invention, to each vertical side of which 12 Helmholtz acoustic sources are connected in an array arrangement.
The acoustic simulation method of the sound field distribution can adopt Ansys acoustic analysis software, and can also utilize computer languages such as C or Basic to compile a finite element partial differential equation solver under specific boundary conditions for simulation calculation.
The test method of sound field distribution can adopt a method of arranging an array microphone in the device to measure the change rule of instantaneous sound pressure at different positions along with time.
Fig. 4 is a schematic diagram of a waveguide without physical shape according to an embodiment of the present invention, where the waveguide 3-1 without physical shape is composed of four spaces where Helmholtz sound sources are located, and the adjusting and controlling bracket 4 can adjust and control spatial positions of any Helmholtz sound source in vertical and horizontal directions.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (5)
1. A sound field test and simulation cooperate control smoke suspended particle sound wave dust removal method is characterized by comprising the following steps: the sound wave dust removing device consists of a plurality of device components; the device components include an acoustic source and a waveguide; under the action of sinusoidal voltage signals with controllable input frequency, voltage amplitude and phase difference among the sound sources, the sound sources can radiate a plurality of sound waves to the inner space of the device, so that specific sound field distribution is formed in the device; the sound field distribution appears as a composite sound field having antinodes and nodes; the flue gas suspended particles in the device are subjected to the action processes of migration, mixing, collision, agglomeration, separation, growth or removal under the action of specific sound field distribution; the flue gas consists of a gas medium and suspended particles;
the first step is as follows: aiming at various smoke conditions and various arrangement methods and operation parameters of device components, firstly, an acoustic simulation method is adopted to obtain a simulation result of sound field distribution in the device under various conditions;
the second step is that: the sound field distribution of the internal space of the device is presented as obvious fluctuation characteristics at different positions as a judgment basis, different simulation results are compared, and the arrangement method and the operation parameters of the device parts are preliminarily formulated;
the third step: aiming at the layout method and the operation parameters of the proposed device components, a test method is adopted to obtain the test result of the sound field distribution, and the layout method and the operation parameters of the selected device components are corrected after the test result is compared with the simulation result.
2. The sound field testing and simulation cooperative manipulation sound wave dust removal method for the smoke suspended particles according to claim 1, characterized in that: the sound field distribution is represented by a spatial-temporal distribution of instantaneous sound pressures at a plurality of locations within the apparatus; the mathematical description basis of the control equation of the acoustic simulation method comprises an acoustic wave equation; the mathematical description of the boundary conditions of the acoustic simulation method is based on the characteristics of sound waves radiated by sound sources and the boundary characteristics between two adjacent sound sources.
3. The sound field testing and simulation cooperative manipulation sound wave dust removal method for the smoke suspended particles according to claim 1, characterized in that: the sound source is a Helmholtz sound source; a plurality of Helmholtz acoustic sources are symmetrically arranged around the waveguide; the waveguide is composed of a plurality of boundary surfaces with physical shapes arranged between sound sources, or is composed of boundary surfaces without physical shapes between sound sources, or is composed of a plurality of boundary surfaces with physical shapes arranged between sound sources and boundary surfaces without physical shapes.
4. The sound field testing and simulation cooperative manipulation sound wave dust removal method for the smoke suspended particles according to claim 1, characterized in that: the sound source is provided with a regulating bracket capable of changing the position of the sound source, and the regulating bracket is used for regulating the arrangement position of the device components in the space.
5. The sound field testing and simulation cooperative manipulation sound wave dust removal method for the smoke suspended particles according to claim 1, characterized in that: a plurality of temperature sensors are arranged inside the device and used for measuring the temperature of the gas medium and the device components; when the smoke condition changes, the measured temperature parameters are used for correcting the sound field distribution simulation result, and then the arrangement method and the operation parameters of the device components are reselected.
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Application publication date: 20200107 Assignee: Nanjing Geruns Environmental Protection Technology Co.,Ltd. Assignor: NANJING INSTITUTE OF TECHNOLOGY Contract record no.: X2023980035202 Denomination of invention: A Sound Field Testing and Simulation Collaborative Control Method for Acoustic Dust Removal of Smoke Suspended Particles Granted publication date: 20211228 License type: Common License Record date: 20230505 |