A systematic review of supercritical carbon dioxide(S-CO2) power cycle for energy industries: Technologies, key issues, and potential prospects

Multi-objective optimization of guide vanes for axial flow cyclone using CFD, SVM, and NSGA II algorithm

The properties and advantages of axial flow cyclones are presented; several dozen of them are already widely used as the first stage of inlet air filtration in internal combustion motor vehicle engines, work machines and helicopters. The necessity to conduct research on cyclones to improve separation efficiency has been demonstrated. Using the commercial engineering software Ansys Fluent, at a constant inlet velocity of 10 m/s, an assessment was made on the effect of the separation length and inlet diameter of the outlet tube on changes in separation efficiency in axial flow cyclone. Each of the examined parameters was variable while maintaining other factors at a constant level. In the numerical calculations, test dust was used, which was the equivalent of AC fine dust, the particle size composition of which was taken into account using the Rosin–Rammler model. Increase in the separation efficiency was observed with an increase in the separation length and a decrease in the diameter of the cyclone inlet tube. For the cyclone model with an increased separation length and reduced diameter of the inlet pipe, numerical tests of separation efficiency and pressure drop were performed for various velocities at cyclone inlet in the range of 2.5–15 m/s. The obtained characteristics of modified axial flow cyclone were experimentally verified on a laboratory stand during cyclone prototype tests, the model of which was printed using the additive manufacturing technique.

Computational and Experimental Analysis of Axial Flow Cyclone Used for Intake Air Filtration in Internal Combustion Engines

Study of dynamic response characteristics of S-CO2 cycle in coal-fired power plants based on real-time micro-grid load and a novel synergistic control method with variable working conditions

Numerical analysis of separation performance of an axial-flow cyclone for supercritical CO2-water separation in CO2 plume geothermal systems

In order to improve the performance of the separation device, a novel kind of cyclone separator is designed. The effects of the structure parameters and operation parameters on pressure drop and separation efficiency are investigated based on orthogonal experimental through the test platform. In addition, the internal flow characteristics in the optimized swirl generator are investigated by numerical simulation. Accordingly, the pressure drop of the optimized swirl generator is 170.9 Pa and its separation efficiency is 68.23% when extraction ratio is 5%. The blade shape and the blade outlet angle can influence the pressure drop and efficiency. The diameter of guiding cone has influence on pressure drop, but has no influence on the efficiency. When the extraction ratio is increased to 10%, the efficiency could be raised to 79.97%, and it has no significant increase at higher extraction ratio. The separation efficiency can reach to 88.10% when it is used to separate 180–250 u m sand. Finally, the simulation reveals that the flow features and distribution in the optimized swirl generator. Therefore, the new-type cyclone separator, which is expected to be applied in separation fields, has great actual using value.

Orthogonal experimental design of an axial flow cyclone separator

Supercritical Carbon Dioxide (S-CO2) Brayton cycles and Concentrating Solar Power (CSP) plants are gaining increasing attention due to environment pollution problems and their higher efficiencies. ...

Thermal performance analysis on steady-state and dynamic response characteristic in solar tower power plant based on supercritical carbon dioxide Brayton cycle

The invention discloses a trepanning electrolytic machining clamp for diffusers with insoluble blade trailing edges and a method thereof, and belongs to the field of electrolytic machining. The clampcomprises a left part and a right part, a cathode and an insulating block are located between a left clamp body and a right clamp body, a controllable liquid outlet gap is formed between the clamp bodies on two sides and the outer contour of the cathode, a liquid outlet corner type is used as the flowing way of electrolyte, the electrolyte flows in from the upper ends of blades and flows out fromthe liquid outlet gap, and a closed flow field is formed by the gap among an insulating sleeve, the cathode and the clamp. The insulating block is attached to the non-machining face of the cathode, sothat three-face machining of the leading edges, the concave surfaces and the convex surfaces of the blades is achieved. Concentric arc surfaces of leading and trailing edge supporting blocks are usedfor clamping annular workpieces. In the machining process, the adjacent machined blades are always sleeved with machined blade protecting sleeves, so that stray corrosion of the machined blades is effectively avoided. Through the trepanning electrolytic machining clamp and the method thereof, the problems of overlarge clamp pressure and electrolyte leakage easiness during diffuser trepanning electrolytic machining are solved, the stability of the flow field is improved easily, and machining quality is improved.

Trepanning electrolytic machining clamp for diffusers with insoluble blade trailing edges and method thereof

The invention discloses a dedusting device using a multi-stage direct current cyclone separator combined array and a method thereof, and belongs to the dedusting field. The device includes a multi-stage direct current cyclone separator array, a gas intake port, a gas discharging port, a dust discharging port, a dust discharging fan and the like. The device is characterized in that the direct current cyclone separator array is used for treating dust-containing gas flow; the dust-containing gas flow enters the device from the gas intake port, is treated by the multi-stage direct current cycloneseparator array and then is divided into two strands of gas with a large flow quantity and a small flow quantity respectively; clean gas flow having relatively large flow quantity is discharged from the gas discharging port; the dust-containing gas flow having relatively small flow quantity and carrying a large amount of dust is discharged from the dust discharging port under the action of the dust discharging fan, and the dust-containing gas flow is separated. Compared with a conventional gas separation and purification device, the device has the advantages that the pressure dropping caused by separation is greatly reduced, and the device can work continuously with mass flow for a long time without replacement of any parts under a condition of maintaining relatively high separation efficiency.

Dedusting device using multi-stage direct current cyclone separator combined array and method thereof

The utility model discloses an axial flow combined dust removal system for high-temperature high-dust-content flue gas, and belongs to the field of gas-solid separation According to the dust removalsystem, the dust content in the flue is reduced by removing dust at the upstream of the flue, and the dust removal system mainly comprises an axial flow type cyclone separation device, a settling chamber, an air extractor and a fluidized bed heat exchanger The working principle of the system is as follows: the axial flow type cyclone separation device separates fly ash from high-temperature high-dust-content flue gas, waste gas carrying the separated fly ash is discharged into the settling chamber from the ash discharging chamber, and secondary separation of the flue gas and the fly ash is realized in the settling chamber when the waste gas passes through a special filler structure of the system; an air extractor is arranged to extract flue gas separated in the second separation process,and a fluidized bed heat exchanger is arranged to collect fly ash and recover waste heat in the fly ash According to the dust removal system, the dust content in the flue can be greatly reduced underthe condition that the temperature of flue gas is not reduced, the effect of protecting the heat exchange surface is achieved, and the use performance of the dust removal system can be greatly improved

Mao Yanqin

Papers

Orthogonal experimental design of an axial flow cyclone separator

Thermal performance analysis on steady-state and dynamic response characteristic in solar tower power plant based on supercritical carbon dioxide Brayton cycle

Trepanning electrolytic machining clamp for diffusers with insoluble blade trailing edges and method thereof

Dedusting device using multi-stage direct current cyclone separator combined array and method thereof

Axial-flow combined dust removal system for high-temperature and high-dust-content flue gas