SU757168A1 - Valve disc for mass exchange apparatus - Google Patents

Description

The invention relates to the contact plates of mass-exchange apparatus and can be used in the processes of rectification and absorption.

The literature describes direct-flow plates with disk or rectangular 5 valves [1]. When such plates are in operation, the flow comes out from under the valves in one direction with the movement of the fluid. Due to the energy of the steam jet, the speed of movement of the liquid on the plate increases, which allows increasing its performance.

However, the main disadvantage of direct-flow valve trays is the low efficiency due to the short phase contact time and low fluid reserves, especially in the area of increased steam load values.

Known valve plate, on the horizontal blade of which there are trapezoid valves, facing a smaller base in the direction of the drain walls [2]. Steam flow from the valve You are a ²⁰ goes at an angle to the direction of fluid movement. The performance of such plates largely depends on the angle

2

between the sides of the trapezoid valves and grows with the increase of the latter. However, this reduces the efficiency and, in addition, increases the hydraulic resistance of the plate, as it decreases the angle between the large base and the sides of the trapezoid.

Thus, such a design cannot provide operation simultaneously with high efficiency and productivity.

The aim of the invention is to increase the efficiency of mass transfer in a wide range of workloads.

This is achieved by the fact that the trapezoid valves face the drain septum with a large base, in the center of the board of which a slot is made, and the walls of the board are bent inward of the valve.

This design of the valve provides a more intensive contact of the interacting phases and greater efficiency of the mass transfer process.

FIG. 1 depicts the proposed

plate, longitudinal section; Fig 2 -

757168

section A — A in FIG. one; in fig. 3 - valve incision; in fig. 4 - the same plan.

The proposed plate includes blade 1, in the holes of which trapezoid valves 2 and overflow device 3 are installed in a checkerboard pattern. Trapezoid valves are equipped with vertical sides 4 at each base, pointing downwards and facing a large base towards the drain partition.

In the center of the vertical side, at the larger base, a slot is made, and the side walls are bent towards the inside of the valve, forming guide ribs 5. Each valve has limiters for the initial gap 6 and the maximum lift height 7.

The plate works as follows.

The vapors rising from the underlying plate pass through the holes in the web of the plate, the liquid enters from the overlying plate through the drainage device and moves along the plate to the discharge point on the lower plate. Due to the slot and guide ribs 5 in the vertical side at the larger valve base, the steam flow is divided into three parts. One part goes cocurrently with the liquid through the window ¹⁵ between the guide reb- ramie, and the other two parts of the vapor stream are located at an angle to the direction of fluid flow through the lateral gap between the flap and the web plates. In the space between any two valves in each ₅₀ row, steam jets intersect. This ensures intensive interaction of the contacting phases and high efficiency. By varying the distance between the guide ribs, it is possible, with a constant valve configuration, to vary by a ratio of 3ί between the steam flows along the fluid flow and at an angle to it. This allows you to get the specified characteristics of the plate and maintain high contact efficiency with increased performance.

The proposed design has several advantages and provides highly efficient operation in a wide range of workloads. The interaction of three steam jets between any two valves provides an intensive interaction of the contacting phases and the renewal of the interfacial surface. This increases the supply of fluid and the contact time of the phases, which also leads to an increase in efficiency.

The features listed above make the proposed plate promising for use in high-performance installations in the oil refining, petrochemical, and related industries.

Claims (1)

Claim Valve plate for mass transfer apparatus, including overflow devices with a drain partition and a horizontal blade, in the holes of which trapezoid valves are installed, equipped with vertical sides at the bases, directed downwards, characterized in that, in order to increase the mass transfer efficiency in a wide range of operating loads, the valves are turned in the direction of the drain septum with a large base, in the middle of the board of which a slot is made, and the walls of the board are bent inward of the valve.