RU2117511C1 - Valve tray - Google Patents

Abstract

FIELD: petrochemical engineering. SUBSTANCE: invention concerns heat-mass-exchange apparatuses and aims at increasing reliability and extending efficient operation range of tray at the expense of passing vapor (gas) into the top section of column thereby sharply expanding it in volume. Valve tray has perforated base with valves in the form of plates provided with side walls bent downward and having facilities preventing vapor (gas) from ascent and turn to leave sideways. Plates also have side walls bent upward with descent stops less high and wide than side walls bent downward. There are axial fingers between the walls. EFFECT: increased reliability. 2 dwg

Description

 The invention relates to devices for heat and mass transfer in steam (gas) -liquid systems and can find application in the oil refining, petrochemical and other industries.

 Known valve plate containing a perforated base with valves in the form of plates equipped with side walls with lift limiters and hinged devices providing one-way opening of the valves [1].

 The disadvantage of this plate is the difficulty of mounting valves due to the presence of special articulated devices.

 The closest in technical essence and the achieved effect is a valve plate containing a perforated base with valves in the form of plates equipped with side walls in the form of bent down sectors with lift limiters, fenders and overflow device [2].

 The implementation of the side walls in the form of sectors allowed to simplify the design by eliminating the articulation of the valve plates with the base of the plate.

 However, this design of the plate does not have sufficient flexibility in operation. With an increase in steam consumption, the plate becomes “choked” with foam, which sharply worsens the separation performance. A sharp increase in steam consumption leads to the destruction of the plates: the valves break out from their places.

 The aim of the invention is to increase the reliability and range of effective operation of the plate by ensuring the passage of steam into the upper part of the column with a sharp increase in its volume.

 This goal is achieved by the fact that in a valve plate containing a perforated base with valves in the form of plates equipped with side walls bent down with lift-turn and steam (gas) limiters, the plates are equipped with additional side walls bent upward with lowering limiters, with smaller height and width than the height and width of the side walls, bent down, and the fingers of the axis located between them.

 A comparative analysis of the proposed solution with the prototype shows that it differs from the known one in that the valve plate is equipped with additional side walls bent upwards with lift-turn limiters with a smaller width and height than the width and height of the side walls bent down and the fingers of the axis located between them. Thus, the inventive valve disc meets the criterion of "novelty."

 Comparison of the claimed technical solution not only with the prototype, but also with other technical solutions in this technical field did not allow us to identify the features that distinguish them from the prototype, which allows us to conclude that the criterion of "significant differences".

 In FIG. 1 shows the proposed valve disc: General view of the column, combined with a section; in FIG. 2 - valve - axonometric projection.

 The valve plate contains a base 1 with perforations 2 and valves made in the form of a plate 3, with side walls 4 bent down with stop-lift 5 and side walls 6 bent up with stop-lift 7 and fingers 8 of the axis 9 located between the side walls 4 and 6. The height H and the width B of the side wall 4 are greater than the height h and the width b of the side wall 6.

 The plate works as follows.

 Steam (gas), passing through the perforations 2 at the base of the plate 1, presses on the valve plate 3, lifting it and turning it in the form of a flat stream, leaves the gap between the plate 3 and the base 1, enters the liquid layer on the plate. At the same time, the liquid layer presses on the valve plate 3. Since the plate is unbalanced with respect to axis 9, the simultaneous exposure of the plate 3 to the steam from below and the liquid from above causes it to rotate on the fingers 8 of axis 9. In this case, the liquid flows down from the plate, but the steam pushes it back. This contributes to additional phase mixing and improves heat and mass transfer. With a sharp increase in volume and vapor pressure under the plate, the further stops of the plate 3 are prevented by the limiters 7 on the side walls 6 bent upwards, therefore the plate 3 rises, turning around the limiter 7 so that the fingers 8 and axes 9 are torn off from the base 1. The further raising of the plate 3 is prevented stops 5 on the side walls bent downward 4. When the steam pressure decreases to the calculated value, the plate 3 lowers back onto the base 1 on the fingers 8 of the axis 9.

 Studies conducted on a cold stand showed that the design of the valve plate in comparison with the prototype - the base object [2] allows you to freely pass twice the amount of steam without breaking the plates and choking it with foam.

Literature:
1. Valve plates. OST-26-02-1401-76.

 2. Auth. testimonial. N 425632 (USSR), cl. B 01 D 3/30; 3/32. Valve plate. / G.G. Telyashev, B.K. Marushkin, V.G. Chekmenev et al. Publ. BI N 16, 1974.

Claims (1)

 Valve plate containing a perforated base with valves in the form of plates equipped with side walls bent downwards with lift-turn and steam (gas) limiters, characterized in that the plates are equipped with additional side walls bent upward with lowering stops with lower height and width than the height and width of the side walls, bent down, and the fingers of the axis located between them.

Images