The results showed that the system operated stably,separation efficiency reached 99.998%,catalyst consumption in regenerator decreased below 0.5 kg/t from 0.3 kg/t,overall pressure drop decreased from 6.8 kPa to 5.5 kPa; this system had better operation flexibility and adaptability.

The restrictive effect of the open-extent of discharge valve on solid circulating rate is obvious, and the increase of overall pressure drop in the holding gas section is more notable than that in the stripping gas section.

The overall pressure drop for return bends may be accounted for gravitational component, accelerational component, wall frictional component,frictional componet due to return flow, and additional pressure drop due to saltation,when the saltation was happened.

In this paper,through theoretical analysis,considering gas frictional pressure drop and pressure regain in diverging section due to droplet′s deceleration,a simple and accurate model for the prediction of overall pressure drop in Venturi scrubbers is deduced.

Through theoretical analysis and based on the gas frictional pressure drop and pressure regain in diverging section due to droplet′s deceleration, a simple and accurate model for the prediction of overall pressure drop in venturi scrubbers was deduced, and calculation data made with this model were compared with experimental data for three venturi scrubbers in different throat length operated at liquid-gas-ratio from 0.4 to 1.0 L/m~3 at throat velocities from 33 to 58 m/s.

The flow equations that are derived were used to calculate dynamic immiscible displacements of oil by water under the constraint of a constant overall pressure drop across the tube bundle.

Shear is the dominant factor controlling the overall pressure drop in flows through small contraction angles.

Good agreement on the overall pressure drop was achieved.

The presence of bubbles as a consequence of heating flow through a vertical rectangular channel has a significant effect on the overall pressure drop along the channel.

Therefore, for the tube-banks considered, the mass transfer rate can be obtained just from measurements of the overall pressure drop and the pressure distribution around a single tube inside the bank.

The vertical tubular leacher was equipped with curved or Square return bends. Pressure drop for flowing mixture of sized sand particles in water through the leacher has been measured, when the equivalent diameter of particle is 0.194, 0.210 and 0.298 mm, the volume fraction of solid is smaller than 0.14, and the flowing velocities between 0.1 and 1.3 m/s, the operation is stable. The saltation in bends was described. For different solid/liquid ratios,and for different types of bends, the experimental curves...

The vertical tubular leacher was equipped with curved or Square return bends. Pressure drop for flowing mixture of sized sand particles in water through the leacher has been measured, when the equivalent diameter of particle is 0.194, 0.210 and 0.298 mm, the volume fraction of solid is smaller than 0.14, and the flowing velocities between 0.1 and 1.3 m/s, the operation is stable. The saltation in bends was described. For different solid/liquid ratios,and for different types of bends, the experimental curves for pressure drop for return bends versus flowing velocity showed that all of ofe curves had a minimum. The greater the particle size and solid/liquid ratio, the higher the saltation velocity and the higher the flowing velocity at which the minimum occurs. The overall pressure drop for return bends may be accounted for gravitational component, accelerational component, wall frictional component,frictional componet due to return flow, and additional pressure drop due to saltation,when the saltation was happened. The additional frictional pressure drop for vertical tubes due to its connection with the bend was accounted into the frictional component due to return flow. The suggested model for the estimation of pressur drop for tubular leacher was confirmed by experimental results.

Various components of the overall pressure drop of tray floor in the presence of both vapor and liquid phases are specifically analysed using float valve tray as an example,the concepts of the corresponding dry-tray pressure drop[ΔP_(De)]and of the corresponding liquid layer pressure head(ΔP_(Le))are proposed to modify the conventional summation model. The pressure drop of Hy-contact valve tray was experimentally tested by the Princl method,from which were derived the formulae...

Various components of the overall pressure drop of tray floor in the presence of both vapor and liquid phases are specifically analysed using float valve tray as an example,the concepts of the corresponding dry-tray pressure drop[ΔP_(De)]and of the corresponding liquid layer pressure head(ΔP_(Le))are proposed to modify the conventional summation model. The pressure drop of Hy-contact valve tray was experimentally tested by the Princl method,from which were derived the formulae for calculating C_3(the total friction drag coefficient of the vapor flow at the aperture and the seam of the valve),C_(1-g)(the friction darg coefficient of vapor- liquid),and h_l(the average clear liquild height of five rows above the tray). The formulae of modified summation model can be applied not only to Hy-contact valve tray,but also agree well with the reported data of F_(-1) valve tray for use in air-diesel testing system.

aking the plain tube and transversely corrugated tube as the elements and the compressed air and water as the mediums,an experimental study of heat transfer of practical machine has been done. The experimental results have shown that the transversely corrugated tube is very effective for heat transfer enhancement of compressed air cooler.It′s overall heat transfer coefficient is as much as 1.77～1.66 times of plain tube within the range...

aking the plain tube and transversely corrugated tube as the elements and the compressed air and water as the mediums,an experimental study of heat transfer of practical machine has been done. The experimental results have shown that the transversely corrugated tube is very effective for heat transfer enhancement of compressed air cooler.It′s overall heat transfer coefficient is as much as 1.77～1.66 times of plain tube within the range of experimental mass flow.Under the special mass folw,It′s overall heat transfer coefficient is as much as 1.75 times of plain tube,or It′s heat exchange area can be cut down by 43%.The overall pressure drop of air cooler of transversely corrugated tube is about as much as 2 times of plain tube. The mechanism of heat transfer enhancement of transversely corrugated tube was discussed.