6 results about "Collision frequency" patented technology

This invention discloses a multi-domain coupled uniform flow high-efficiency electrostatic precipitator, relating to the technical field of electrostatic precipitator equipment. It includes a precipitator housing with inlets and outlets on both sides. The interior of the precipitator housing is sequentially divided along the gas flow direction into multiple conventional electric field adsorption zones and at least one low-velocity electric field adsorption zone. The low-velocity electric field adsorption zone includes multiple anode units, multiple flow guiding components, and multiple cathode units. This invention utilizes the flow guiding components, the corrugated anode plate, and through holes on the first and second sidewalls. The flow guiding components divert the flue gas, allowing some gas to directly impact the V-shaped groove. Compared to conventionally designed through holes, the staggered arrangement of the through holes disrupts the stable airflow path, causing more intense collisions, shearing, and turbulence in the airflow entering the V-shaped groove from different directions. This significantly increases the collision frequency and energy between particles, resulting in larger and more easily captured particles.

The invention discloses a dynamic electromagnetic reverberation chamber based on plasma regulation and control and a control method thereof, and belongs to the technical field of electromagnetic testing. A plasma array module and a driving control module are arranged on the inner wall surface of a cavity of the reverberation chamber; the electronic density and the collision frequency of the plasma unit are changed by adjusting the discharge parameters of the plasma unit in real time, so that the equivalent quality factor Q value, the normalized field intensity and the energy attenuation time constant of the reverberation chamber are dynamically and continuously adjusted and controlled; the limitation that a traditional reverberation chamber depends on a fixed wave-absorbing material or a mechanical stirrer is broken through, millisecond-level rapid switching of key electromagnetic parameters is achieved, the device has the advantages of being high in space efficiency, compatible in broadband and flexible in working mode, and the testing efficiency and the application range of the reverberation chamber are remarkably improved.

The invention provides an arc wind tunnel dynamic flow field plasma parameter microwave measurement device and method, the device comprises an arc wind tunnel, a microwave system, a vector analyzer and a data processing module, a transmitting antenna and a receiving antenna of the microwave system are coaxially and horizontally arranged on two sides of a plasma flow field, and a beam waist is accurately aligned with the center of the flow field. According to the method, static and dynamic S parameters are measured through system self-calibration and wide-frequency-band frequency sweeping, a net transmission coefficient is calculated, and the electron density and the collision frequency are synchronously obtained by combining a forward calculation model, a residual objective function, a genetic algorithm and a Levenberg-Marquardt combined inversion algorithm. According to the invention, non-contact measurement is adopted, and a time domain gating filtering technology is matched, so that the problems of clutter interference and equipment ablation are avoided, online real-time accurate measurement of plasma parameters is realized, and reliable data support is provided for research on related characteristics of aircrafts.

The invention relates to the field of coal-fired flue gas treatment, and discloses a method for removing SO3 in coal-fired flue gas through charge coagulation, which comprises the following steps: S1, a pre-charging step: enabling SO3 aerosol to carry first polar charges; s2, a generation and injection step: atomizing the alkaline solution into alkaline microdroplets carrying second polar charges; s3, coagulation: driving the two kinds of particles to move relatively by utilizing the traveling wave electric field; s4, acquiring a real-time feedback signal reflecting the coagulation efficiency; and S5, dynamically adjusting the operation parameters based on the feedback signal. According to the invention, electric field forces with opposite directions are applied to SO3 aerosol and alkaline microdroplets carrying charges with opposite polarities through a traveling wave electric field to drive the two kinds of particles to generate relative motion, and the particle coagulation is converted from a passive process depending on slow Brown diffusion into a capture process dominated by an external electric field, so that the particle coagulation efficiency is improved. Furthermore, the collision frequency and the coagulation rate among the submicron particles are improved.

This invention proposes a variable scaling method for PIC-MCC models, comprising: establishing an initial PIC-MCC physical model; selecting a scaling factor and, following the discharge similarity law, constructing variable scaling relationships between plasma density, collision cross section, and particle kinetic energy in a scaled-down PIC-MCC simulation model corresponding to the PIC-MCC physical model; determining variable scaling relationships between thermocurrent density, plasma frequency, particle collision frequency, and particle collision probability in the scaled-down PIC-MCC simulation model; determining the variable scaling relationship parameters in the scaled-down PIC-MCC simulation model, conducting plasma particle simulation, and mapping the calculation results of the scaled-down PIC-MCC simulation model back to the initial PIC-MCC physical model. This invention solves the problems of existing scaling techniques exacerbating plasma instability and local electric field effects, and maintains undistorted simulation results even at large scaling ratios, significantly improving calculation accuracy.

The application relates to the field of coal-fired flue gas treatment, and discloses a method for removing SO3 in coal-fired flue gas through charging and coagulation, which comprises the following steps: step S1, a pre-charging step: making the SO3 aerosol carry a first polarity charge; step S2, a generating and injecting step: atomizing an alkaline solution into alkaline droplets carrying a second polarity charge; step S3, a coagulation step: using the traveling wave electric field to drive the relative movement of the two kinds of particles; step S4, obtaining a real-time feedback signal reflecting the coagulation efficiency; and step S5, dynamically adjusting the operation parameters based on the feedback signal. Through the traveling wave electric field, the SO3 aerosol carrying opposite polarity charges and the alkaline droplets are subjected to electric field forces in opposite directions, the relative movement between the two kinds of particles is driven, the particle coagulation is changed from a passive process depending on slow Brownian diffusion into a capture process dominated by an external electric field, and then the collision frequency and coagulation rate between submicron particles are improved.