Countercurrent Cyclone Research Articles

Numerical Modeling of Cyclone Machine for Cleaning Gas Generator Gases

Analysis of contemporary cyclone gas purification apparatus was carried out in this article Calculation of the characteristics of the counterflow cyclone in application of pressurization system of the LV fuel tanks with gas pressure accumulator has been executed. 3D-model of the counter-flow cyclone was built. Numerical modeling of soot-cleaning process in countercurrent cyclone has been performed using ANSYS Fluent.

The Calculated Ratio of the Gas Flow in a Countercurrent Cyclone Dust Concentrator

There are numerous studies of the structure of swirling flow in a variety of devices in which the peculiarities of the parameters associated with the twist flow. The values of the local parameters of the twist of the axial direction are experimentally and connect them with a constructive twist parameter, which is built from the idealized repose of the gas flow in vortex distribution and speed at the exit of the swirl. For counter flow chamber is the equation for the input pulse in the radial direction and the twist parameter is provided in the radial direction. It allows us to estimate the maximum radius of the circumferential velocity not only near the outlet, but also near the end surface of the chamber. On a cylindrical surface with a radius of outlet cyclone tangential turbulent friction in the radial direction depends on the product of a circle and radial speeds. Compiled equation changes the flow of angular momentum in the axial zone, depending on the force of friction tangential flow on the surface with the radius of the outlet pipe of the cyclone. This equation allowed assessing the circulation of gas in the axial zone.

Gas Dynamics in a Counterflow Cyclone with Conical Nozzles on the Exhaust Pipe

Countercurrent cyclones have been quite widely applied in various industries [1-12]. In this paper, on the example of classical construction of countercurrent cyclone considers the impact of the conical nozzle on the exhaust pipe to the gas-dynamic picture and efficiency dedusting.

Studying the aerodynamic parameters characterizing motion of gas suspension in a countercurrent cyclone heat exchanger

The physical pattern of flow in a countercurrent cyclone heat exchanger obtained from experiments carried out on a small-scale model of it is presented. Self-oscillation behavior of a toroidal vortex occurring in the apparatus was experimentally observed. A possibility of reducing the quantity of large particles of solid materials 0.07–0.15 mm in size entrained from a countercurrent cyclone heat exchanger is investigated.

A study of heat-transfer processes in a countercurrent cyclone heat exchanger

Heat-transfer processes in a countercurrent cyclone heat exchanger are investigated on a pilot installation. Volumetric coefficients of heat transfer from gases to a flow of solid particles are determined during operation with tangentially swirled flow of gas suspension, separation of solid particles on the heat-exchanger walls, and deceleration of flue gas flows as they collide with the charge mixture fed to the apparatus.

Hydrocyclone Circuits

A number of plant surveys have shown that hydrocyclones used for classification have significant problems with respect to the efficiency of size separation and the particle density effect. The issues of minimizing the amount of ultrafines and maximizing the amount of light coarse particles in the oversize flowstream require conflicting operational approaches with a single cyclone. Earlier modelling work suggested that the Three Stage Counter Current Cyclone Circuit was able to provide the best mechanism for addressing these issues compared to a single cyclone. In order to evaluate the potential of this type of circuit, a pilot-scale investigation program was initiated. This involved identifying the relationship between the key control variables and response variables in order to optimize the circuit. This circuit has been shown to achieve the following: ” A much sharper separation with a low level of ultrafines in the oversize stream due to two stages of cycloning. ” Marked reduction in the amount of misplaced coarse clean coal in the undersize flowstream. ” Reduction in the amount of ultrafine pyrite in the oversize flowstream. ” Lower separation sizes without impacting efficiency.

One-dimensional model of the acid hydrolysis of cellulosic substrates in a solid-liquid cyclone reactor

The use of rotating flow in an annulus is investigated as a means of enhancing the yield of glucose and xylose in the acid hydrolysis of cellulosic slurries. A one-dimensional model of such a cyclone reactor is developed for flow cases, co-current and counter-current flow. For the case of 250°C, 1% w/w acid, the one-dimensional model indicates an increase in the maximum glucose yield from 48.1% in a plug flow reactor to 69.3% in a co-current cyclone reactor, and up to 81.0% in a countercurrent cyclone reactor. The corresponding xylose yields are 91.6% for co-current operation and 97.7% for countercurrent operation. In the co-current case the maximum glucose and xylose yields do not occur at the same location in the reactor; however, in the countercurrent case they do. Although product yields are dramatically improved over those obtained in a plug flow reactor, the product concentrations are lower than would typically be obtained in a plug flow reactor.