9 results about "Inlet velocity" patented technology

The invention relates to the technical field of boiler energy conservation, in particular to a gas boiler flue gas fan intelligent regulation and control method which comprises the following steps: S1, collecting the temperature of gas and the wind speed parameter information of a fan inlet in real time, and smoothing the collected temperature parameter and wind speed parameter to obtain a temperature smooth value Tfilt and a wind speed smooth value vfilt; s2, calculating a total correction coefficient Ktotal according to a temperature smooth value and a wind speed smooth value by taking the temperature of the fuel gas and the inlet wind speed of the fan as influence items on the rotating speed of the fan; s3, correcting the reference rotating speed of the fan according to the total correction coefficient Ktotal to obtain a target rotating speed narget; and S4, smoothing the target rotating speed narget to obtain the output rotating speed of the fan. According to the method, through a multi-parameter cooperative regulation and control strategy, it can be ensured that the draught fan always operates near the optimal state under various working conditions, and the overall heat efficiency of the gas boiler and the operation efficiency of the draught fan are remarkably improved.

A kind of thickness control compensation method for ultra-high strength steel cold continuous rolling acceleration and deceleration process, by the evaluation model based on strip outlet thickness out-of-tolerance rate set, in combination with the actual value of each rack rolling force, each rack inlet speed, each rack outlet speed, each rack inlet thickness, each rack outlet thickness, the optimization evaluation of set front tension and set rear tension is completed, according to the evaluation result, the optimization of front tension and rear tension set value is completed, and the thickness control compensation of ultra-high strength steel cold continuous rolling acceleration and deceleration process is completed accordingly.A kind of thickness control compensation method for ultra-high strength steel cold continuous rolling acceleration and deceleration process according to actual multidimensional data and in combination with the evaluation model set, establishes the thickness control compensation optimization based on multiple factors.

The invention provides an intelligent pneumoperitoneum system with dynamic smoke removal and constant pressure functions and a using method, the intelligent pneumoperitoneum system comprises a suction and pneumoperitoneum all-in-one machine and a double-cavity aspirator head, the suction and pneumoperitoneum all-in-one machine comprises a shell and a containing space located in the shell, and a control module, a gas supply channel and a gas recovery and purification channel are arranged in the shell; the double-cavity aspirator head is connected with the gas supply passage and the gas recovery and purification passage; the system collects smoke concentration and pressure signals in the abdominal cavity in real time through the smoke concentration detection module and the outlet pressure gauge which are integrated in the double-cavity aspirator head and feeds back the smoke concentration and pressure signals to the control module. The control module constructs a closed-loop control algorithm based on an ideal gas state equation, the suction power of the suction module and the gas inlet rate of the pressure regulating module are dynamically and cooperatively regulated, and rapid removal of smoke in an operation and dynamic stability of pneumoperitoneum pressure are achieved. Two-stage waste gas filtration is integrated, it is ensured that exhausted gas is harmless, and the integrated guarantee of clear surgical view, coherent operation and patient safety is achieved.

The application discloses a multi-component powder mixing uniformity evaluation method based on digital twinning, relates to the technical field of powder mixing evaluation, and establishes a virtual model coupled with computational fluid dynamics and discrete elements and synchronizes with monitoring data such as on-site flow, wind speed, particle count and speed, and temperature and humidity; the gas flow field and particle forced motion are iteratively solved in the virtual space to obtain the residence time, circulation trajectory and component concentration distribution of typical regions such as the injection zone, fountain zone and annular zone; the gas flow unevenness index, particle residence time error and aligned mass component are constructed, feedback control is used to correct parameters such as inlet speed, outlet pressure, gas flow direction and screw rotation speed, and the twin parameters are updated in stages according to the working condition; based on the Rasi uniformity index and variance decomposition, the evaluation result is formed, the uniformity grade, abnormal area positioning, key influence factor and traceable evaluation report are output, and a basis is provided for subsequent process parameter setting and online adjustment.

This invention provides a method for arranging baffles in a high-pressure hydrogen storage tank based on the jet dissipation transition point, and a hydrogen storage tank in the field of hydrogen storage. The method includes: establishing a baseline flow field of the high-pressure hydrogen storage tank under conditions where no baffles are installed; obtaining the axial velocity distribution and turbulent kinetic energy distribution along the central axis of the high-pressure hydrogen storage tank in the baseline flow field; identifying the location where the turbulent kinetic energy of the fluid first reaches its peak value in the region where the ratio of axial velocity to fluid inlet velocity first decays below a preset ratio threshold, and determining this spatial location as the jet dissipation transition point; arranging baffles at the jet dissipation transition point, or arranging baffles within a preset axial range near the jet dissipation transition point. This method can determine a more optimal baffle position. By arranging the baffles at the jet dissipation transition point, the residual axial kinetic energy of the jet is efficiently converted into radial turbulent kinetic energy, inducing large-scale vortex structures, thereby significantly enhancing downstream wall heat transfer.

The invention discloses a plasma burner based on active decoking and air film protection, the plasma burner comprises a burner main body, a first-stage cylinder and an air powder pipeline, the inlet section of the first-stage cylinder is set to be of a horn-shaped flaring structure so as to reduce the flow speed of a pulverized coal airflow inlet and reduce the impact of molten ash particles on the cylinder wall; an annular wall-attached air cavity is formed in the horn-shaped flaring structure, and a slit type air outlet is formed in the inner wall of the horn-shaped flaring structure and used for forming a wall-attached cooling air film, so that cylinder wall cooling and molten ash isolation are achieved. A mechanical rotary propelling decoking device is integrated on the burner main body and comprises a driving motor, a trapezoidal screw rod, a screw rod nut and a rotary outer protective pipe, a decoking head is fixed at the front end of the rotary outer protective pipe, the screw rod nut is fixedly connected with the rotary outer protective pipe, and the trapezoidal screw rod drives the decoking head to rotate and axially feed when rotating and extends into the first-stage cylinder to execute decoking operation. Passive prevention and active removal are combined, the operation stability of the combustor is remarkably improved, and the service life of the combustor is remarkably prolonged.

The invention discloses a multi-component powder mixing uniformity evaluation method based on digital twinning, and relates to the technical field of powder mixing evaluation, and the method comprises the steps: building a virtual model for calculating fluid dynamics and discrete element coupling, and synchronizing the virtual model with monitoring data such as field flow, wind speed, particle counting and speed, temperature and humidity; iteratively solving the airflow field and particle stress motion in the virtual space to obtain the residence time, the circulation track and the component concentration distribution of typical areas such as an injection area, a fountain area and an annular space area; constructing an airflow non-uniformity index, a particle retention time error and an alignment mass component, correcting parameters such as an inlet speed, an outlet pressure, an airflow direction and a screw rotating speed by adopting feedback control, and updating twin parameters in stages according to working conditions; and an evaluation result is formed based on the Raschig uniformity index and variance decomposition thereof, and a uniformity level, abnormal region positioning, key influence factors and a traceable evaluation report are output, so that a basis is provided for subsequent process parameter setting and online adjustment.

The utility model relates to the technical field of fluidized bed boilers, and discloses a circulating fluidized bed boiler with a high-temperature separation function, which comprises a hearth, a boiler barrel device, an air distribution device, a separator, a return feeder and a tail flue, the separator adopts a high-temperature cyclone separator design, an inlet of the separator is in an inclined and tapered form, a central barrel is arranged at the top of the separator, and the tail flue is arranged in the central barrel. An inlet is formed in the left side of the separator. According to the utility model, by optimizing the design of the high-temperature cyclone separator, the separation efficiency is improved to more than 99.5%, the fine ash share is increased, the flow rate of a flue gas inlet is effectively improved, the speed of external swirling air flow is increased, and the air flow field is optimized, so that the separation efficiency is obviously improved; according to the bell jar type coal-leakage-free air cap, through multi-dimensional innovation and optimization of the structure, the material, the air distribution performance, the maintainability and the like, the operation efficiency and stability of the boiler are remarkably improved, meanwhile, the maintenance requirement is reduced, and a guarantee is provided for safe and efficient operation of the circulating fluidized bed boiler.

The invention relates to a regulating valve prediction model construction method based on instantaneous multi-opening response. According to the method, a multi-opening-degree three-dimensional model is constructed based on actual structure parameters, and flow field data including outlet pressure, steam volume fraction and outlet speed are obtained through CFD transient simulation. The time, the opening degree and the inlet speed are used as input, the outlet parameters are used as output, a multi-layer feedforward neural network is adopted to establish an agent model, and a Levenberg-Marquardt algorithm is used for training and optimization. The established model can quickly predict the valve flow response under any opening degree and time conditions, has the characteristics of high efficiency, good precision, strong generalization and the like, and is suitable for real-time state prediction, intelligent control and optimization design of the regulating valve.