CN2805874Y - Tower plate with novel inlet weir - Google Patents

Abstract

The utility model relates to a tower plate with a novel inlet weir, which belongs to the field of chemical equipment. The utility model comprises tower plates [1], outlet weirs [2] and inlet weirs [4]. The utility model is characterized in that the inlet weirs are higher than the outlet weirs, wherein one end of each tower plate is fixedly provided with one outlet weir vertically in an upward arrangement mode; the other side of each tower plate is fixedly provided with one inlet weir vertically in an upward arrangement mode; the edge of each inlet weir is provided with a bent. The two structure improvements can obviously improve the liquid flow state on the tower plates; the returning and mixing regions of the liquid inlet part of the tower plates are reduced or eliminated, thereby, the mass transfer efficiency of the tower plates is increased.

Description

Column plate with novel inlet weir

Technical field

The utility model belongs to the chemical industry equipment field, the used column plate of particularly various towers.

Background technology

Column plate is the main internals that are widely used in gas-liquid mass transfer (contact) equipment (as rectifying column, absorption tower etc.) plate column.The basic structure of column plate comprises: column plate 1 (patterns such as bubble-cap, sieve plate, float valve can be arranged), exit weir 2 (also claiming outer weir) and inlet weir 4 (weir in also claiming), Fig. 1 is seen in structural representation.In tower, column plate 1 places on the bracing ring that is welded in the tower wall with a determining deviation, and tightens up with clamp.Exit weir 4 is welded in the tower wall to fix its position, and promptly keeping the outlet height of weir is 25 to 50mm, has the exit weir length of design appointment.

The main effect of inlet weir has: make the liquid stream that enters column plate comparatively even; The liquid bubbling that helps column plate liquid-inlet district.

Because conventional inlet weir effect is set not clearly, and complex structure, seldom use in the tray designs.The inlet weir height is suitable with exit weir usually, i.e. 25mm～50mm.

When inlet weir not being set,, and " inertia " that is difficult for bubbling is arranged because liquid flows down and enter column plate and can have greater impact, so, flowing to a certain entrance region of column plate at liquid, gas is difficult for passing liquid, and bubbling, thereby this part column plate does not have the gas-liquid mass transfer effect; Also by the serious herein leakage of column plate, these all can reduce plate efficiency to liquid simultaneously.For this reason, both at home and abroad for impelling this part column plate to realize that immediately the gas-liquid bubbling has proposed many patents, as the bubbling promoters, though their effects are good, complex structure is difficult for extensively utilizing.

Column plate (even conventional inlet weir is arranged) is gone up liquid flow and is prone to very much non-uniform phenomenon, and (as greater than 1.2～1.5m), situation is even more serious on the major diameter column plate.Being as Fig. 2 is to have liquid distributions schematic diagram on the column plate now, and the direction of arrow is the liquid flow path direction.Fig. 2 shows that column plate often can be divided into the arch area 10 on rectangle region 20 and the edge, and is very fast at the middle body of rectangle region flow rate of liquid, and the boundary member flow velocity is slower; In arch area, often form the backflow of liquid, or flow velocity is zero, so arch area is also referred to as the stagnation region of liquid stream.Do not have fresh liquid to flow at stagnation region, even the gas-liquid bubbling is arranged, can not realize gas-liquid mass transfer, this part column plate has play a part negative, has reduced plate efficiency.For improving the liquid stream of column plate arch area, realize the liquid stream uniformity of whole column plate, propose multiple patent and technology (as being provided with of pilot hole etc.), thereby can improve plate efficiency.But owing to dyscalculia, pilot hole position are difficult to accurately, and need the punching press column plate, these patents and technology also are difficult for generally adopting.

Be gas-liquid bubbling state on the column plate, the bubbling floor height is about 2～3 times of height of weir.But liquid is supernatant layer 40 before flowing into column plate bubble level 30, a liquid layer drop is obviously arranged, as shown in Figure 3 here.This liquid layer drop makes the column plate liquid-inlet partly have the serious back-mixing of liquid district 50 just, and its length is about 200～400mm.At this regional liquid is complete admixture, and mass-transfer efficiency is poor, eliminates the complete mixed zone of column plate liquid-inlet partially liq and will improve plate efficiency.At present, Shang Weijian has to report to refer to how to take measures effectively to address this problem.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of column plate with novel inlet weir is provided.

The purpose of this utility model is achieved in that the column plate with novel inlet weir, comprising: column plate [1], exit weir [2] and inlet weir [4], and it is characterized in that: inlet weir exports height of weir; Wherein, install exit weir vertically upward, install inlet weir vertically upward at the other end of column plate at an end of column plate.

Above-mentioned inlet weir edge has bending.

Column plate bubbling behind the employing new construction inlet weir and liquid flowing state are as shown in Figure 4.These two architecture advances will obviously be improved liquid-flow state on the column plate: the back-mixing district of column plate feed liquor part reduces or eliminates; This part of column plate does not reduce in the bubbling zone; Liquid stream uniformity greatly improves, and almost reaches and at the uniform velocity passes through column plate.

On experiment and calculating basis, the column plate that the utility model proposed with novel inlet weir, its usefulness has three: the bubbling that effectively promotes column plate liquid-inlet district; Obviously improve liquid stream uniformity on the column plate; Significantly eliminate the liquid dispersion of column plate feed liquor part.Though preceding two usefulness are identical with conventional inlet weir, the new construction of this patent has excellent effect improving on the column plate liquid stream uniformity.The 3rd usefulness is that this patent is peculiar.

Beneficial effect: after plate column adopts the new construction inlet weir of this patent proposition, can improve the plate efficiency 10～25% of full tower.This amplification has very considerable economic for (often reaching 60～80 blocks more than the column plate) plate column large diameter and that the number of plates is more.

Because plate column is still the main tower of large production equipments such as oil plant, petrochemical plant at present, in departments such as chemical fertilizer, light industry, environmental protection general employing is arranged also, is most widely used chemical industry equipment.Improve tower plate structure, make it reach higher plate efficiency, to cutting down the consumption of energy, save investment, guarantee high-quality, environmentally all playing an important role.

Description of drawings

Fig. 1 is existing tower plate structure schematic diagram; Wherein, 1-1 is a front view, and 1-2 is a vertical view;

Fig. 2 is liquid distributions schematic diagram on the existing column plate;

Fig. 3 is the bubbling view on the existing column plate;

Fig. 4 is bubbling and the liquid-flow state schematic diagram that has on the column plate of novel inlet weir; Wherein, 4-1 is a front view, and 4-2 is a vertical view.

The specific embodiment

Fig. 1 represents the critical piece structure and the position thereof of column plate commonly used.This patent only needs to add a novel inlet weir on column plate commonly used, and its position is higher than exit weir, and its structural shape has bending for the inlet weir edge, and a letter is shown as Fig. 4-1.End at column plate 1 installs exit weir 2 vertically upward, installs inlet weir 4 vertically upward at the other end of column plate.Inlet weir and exit weir are the steel plates with certain altitude.

About size and open angle, the welding position of the edge bending of this inlet weir, highly select for use, should look the tower and the technological parameter of different-diameter and determine cautiously, should be aided with the hydrodynamics test in case of necessity, so that can obtain the better implement effect.

The column plate that adopts this patent to propose with novel inlet weir, compare with column plate commonly used, the change of gas-liquid bubbling state mainly has been to eliminate the back-mixing district 50 in liquid-inlet zone on the column plate, liquid stream uniformity has clear improvement on the whole column plate simultaneously, can obviously reflect by Fig. 4-1 and 4-2, wherein Fig. 4-2 direction of arrow is the liquid flow path direction.The change of bubbling and liquid-flow state on this column plate can improve the mass-transfer efficiency of column plate, receives favorable economic benefit and social benefit.

Claims (2)

1, have the column plate of novel inlet weir, comprising: column plate [1], exit weir [2] and inlet weir [4] is characterized in that inlet weir exports height of weir; Wherein, install exit weir vertically upward, install inlet weir vertically upward at the another side of column plate at an end of column plate.

2, the column plate with novel inlet weir according to claim 1 is characterized in that: the edge of inlet weir [4] has bending.

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