CN214654668U

CN214654668U - Negative pressure debenzolization tower

Info

Publication number: CN214654668U
Application number: CN202120470563.2U
Authority: CN
Inventors: 王柱祥; 商恩霞
Original assignee: TIANJIN CHUANGJU TECHNOLOGY CO LTD
Current assignee: TIANJIN CHUANGJU TECHNOLOGY CO LTD
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2021-11-09
Anticipated expiration: 2031-03-04

Abstract

The utility model discloses a negative pressure debenzolization tower, which comprises a debenzolization section positioned at the upper part, a regeneration section positioned at the middle part and a storage tank section positioned at the lower part; the debenzolization section comprises a debenzolization rectification section and a debenzolization stripping section; at least two layers of tower trays are arranged inside the debenzolization rectification section in a vertically staggered manner, and a plate space is arranged between every two adjacent layers of tower trays; the debenzolization stripping section adopts a filler structure. The rectifying section of the negative pressure debenzolization tower adopts a tower tray structure, and compared with a packing structure adopted by the rectifying section of the existing debenzolization tower, the defect that the wetting effect of the surface of the packing is not good due to the small liquid amount of the rectifying section of the debenzolization tower is overcome, and the mass transfer efficiency is improved. The stripping section adopts a packing structure, and compared with an inclined hole tower tray structure adopted by the stripping section of the existing debenzolization tower, the pressure drop is small. The anti-blocking light tower tray used by the negative pressure debenzolization tower has an original sleeve structure, reduces the lifting amount of a single air lift hole, ensures that the gas-liquid phase mass transfer process uniformly occurs in all air lift holes, ensures the rectification effect and effectively reduces the pressure drop of the tower tray.

Description

Negative pressure debenzolization tower

Technical Field

The utility model relates to a crude benzol distillation plant in the chemical industry field specifically is a negative pressure debenzolization tower of using high-efficient superstrong anti stifled tower tray.

Background

Currently, the negative pressure debenzolization process is used to reduce the boiling point of rich oil (far from the boiling point of the rich oil at normal pressure) and increase the relative volatility of benzene substances by means of low-pressure operation, and the benzene substances are evaporated from the rich oil by heating the rich oil at a temperature lower than the normal pressure operation temperature, so that the rich oil is regenerated. And the coal gas from the final cooling tower enters a benzene washing tower from the bottom, and lean oil sent from the crude benzene distillation unit is sprayed from the top of the benzene washing tower and reversely contacts with the coal gas to absorb benzene in the coal gas. After the benzene-washed coal gas is subjected to mist catching, oil mist liquid drops carried in the coal gas are caught and then sent to the next working section. And pumping out the rich oil at the bottom of the benzene washing tower by using a rich oil pump, and sending the rich oil to a crude benzene distillation unit for debenzolization and regeneration.

Both the invention patent with application number 200910014859.7 and the utility model patent with application number 201920137171.7 disclose a debenzolization tower technology. Wherein, the former is a negative pressure debenzolization tower, and the main structure of the tower is a tower body and a tower internal part. The internal components of the rectification section tower in the former adopt PFG4.5 regular packing, and the internal components of the rectification section tower in the latter adopt pall ring light porcelain packing. Both stripping sections adopt inclined-hole trays. This structure has the following disadvantages: because the liquid volume of the rectifying section of the debenzolization tower is small, the wetting effect on the surface of the packing is not good, the theoretical plate efficiency is low, and the regular packing is not suitable to be adopted; the stripping section adopts an inclined-hole tower tray, so that the tower plate has low thermal efficiency, high operating cost, small processing capacity, large pressure drop and easy blockage, and is not beneficial to industrial practical application; the inclined hole tower tray has large resistance reduction and low applicability to dirty systems.

SUMMERY OF THE UTILITY MODEL

To the deficiency of the prior art, the utility model aims to solve the technical problem of providing a negative pressure debenzolization tower.

The technical scheme of the utility model for solving the technical problems is to provide a negative pressure debenzolization tower, which is characterized by comprising a debenzolization section positioned at the upper part, a regeneration section positioned at the middle part and a storage tank section positioned at the lower part; the debenzolization section comprises a debenzolization rectification section and a debenzolization stripping section; at least two layers of anti-blocking type light tower trays are staggered up and down inside the debenzolization rectification section, and a plate space is arranged between two adjacent layers of anti-blocking type light tower trays; the debenzolization stripping section adopts a filler structure;

the anti-blocking light tower tray comprises a tower tray plate, a down-flow plate, a liquid receiving tray, a V-shaped liquid baffle plate group, a connecting plate, a supporting beam, a supporting ring and a sleeve; the two ends of the liquid descending plate are fixed on the inner wall of the debenzolization rectification section, and the edge of the liquid receiving disc is fixed on the inner wall of the debenzolization rectification section; the outer side of the support ring is fixed on the inner wall of the debenzolization rectification section; two arc edges of the tower plate are connected to the support ring; one of two straight sides of the tower plate is connected with the down-flow plate, and the other is connected with the liquid receiving plate; the supporting beam is fixed on the inner wall of the debenzolization rectifying section and used for supporting the tray plate; the sleeve is welded and fixed on the tray plate through the supporting legs, and a bottom gap is formed between the sleeve and the tray plate; the tray plate is provided with air lifting holes, and the positions of the air lifting holes correspond to the sleeves; the V-shaped liquid baffle plate group is connected to the lower part of the tower tray plate through a connecting plate.

Compared with the prior art, the utility model discloses beneficial effect lies in:

(1) the rectifying section of the negative pressure debenzolization tower adopts a tower tray structure, and compared with a packing structure adopted by the rectifying section of the existing debenzolization tower, the defect that the wetting effect of the surface of the packing is not good due to the small liquid amount of the rectifying section of the debenzolization tower is overcome, and the mass transfer efficiency is improved.

(2) The stripping section of the negative pressure debenzolization tower adopts a packing structure, and compared with an inclined hole tower tray structure adopted by the stripping section of the existing debenzolization tower, the pressure drop is small.

(3) The tower tray used in the negative pressure debenzolization tower is a high-efficiency super-strong anti-blocking tower tray with large liquid lifting amount and small gas-liquid entrainment. Compared with a vertical sieve plate tray, the space between plates is almost a mass transfer space, the gas-liquid contact time is long, the mass transfer is facilitated, the mass transfer efficiency is higher, and the lean oil containing benzene can be reduced to 0.15 percent or even below 0.1 percent; the V-shaped liquid baffle plate group is arranged below the upper layer of tower plate to separate liquid phase entrainment, so that entrainment is reduced to the maximum extent.

(4) The anti-blocking light tower tray used in the negative pressure debenzolization tower has strong anti-blocking capability. Compared with the inclined hole tower tray, the plate is not provided with an easy-to-block part, the gas velocity at the open hole of the tower plate is higher, the blockage is not easy to form, and no bubble is formed. The anti-blocking performance is obvious for systems with particle precipitation and very easy blocking. The anti-blocking capability is improved by 10 times compared with that of an inclined hole tower tray and is improved by 4-6 times compared with that of a vertical sieve plate tower tray. Greatly improving the maintenance period of the tower plate. The advantages are not possessed by the inclined hole tower tray and the vertical sieve plate tower tray.

(5) The anti-blocking light tower tray used by the negative pressure debenzolization tower has an original sleeve structure, is specially designed for the rectification section of the debenzolization tower with large gas phase load and small liquid phase load, reduces the lifting amount of a single air lift hole, enables the gas-liquid phase mass transfer process to uniformly occur in all the air lift holes, avoids the mass transfer process to only occur in a certain single air lift hole, ensures the rectification effect and effectively reduces the pressure drop of the tower tray.

(6) The negative pressure debenzolization tower can improve debenzolization efficiency, improve product quality, increase operation flexibility and save energy consumption. Especially, compared with an inclined hole tower tray, the tower tray number can be greatly reduced, and the overhaul period is prolonged. Tests show that the anti-blocking capability of the tower tray of the debenzolization tower can prolong the maintenance period by 50 to 100 percent compared with the maintenance period of the debenzolization tower in the prior art. The installation and the maintenance are convenient.

(7) This negative pressure debenzolization tower utilizes neotype tower tray structural design through changing the interior gas-liquid mass transfer form of tower, can satisfy the fluctuating change requirement of parameter of rich oil system, and the operation elasticity adapts to the requirement of production more, improves the separation efficiency of tower tray, reduces and blocks up, reduces the veneer pressure drop, makes product quality and production efficiency obviously promote, can be in the wide application of coking production. When the number of the trays is the same, the treatment capacity of the tower tray of the debenzolization tower is increased by at least 20 percent compared with the debenzolization tower in the prior art, or the diameter of the designed tower is smaller than that of the traditional design by 100 and 200mm, the structure is simple, and the cost is reduced.

(8) The negative pressure debenzolization tower integrates three functions of debenzolization, regeneration and storage into one tower, so that the occupied area is saved, and meanwhile, the storage tank can enlarge the space of a tower kettle and avoid the evacuation of a lean oil pump. Compared with a rectifying tower using other trays, the tower has the advantage of diversified functions, especially compared with an ammonia still belonging to a chemical production workshop.

(9) The negative pressure debenzolization tower is suitable for newly-built projects and is also suitable for reconstruction of old towers, for example, the distance between trays (plates) is more than 400mm, the trays can be directly replaced, namely, the tray plates and the plate upper components (V-shaped liquid baffle plate groups, sleeve structures and connecting plates) are used for replacing the original inclined hole trays, float valve trays, vertical sieve plate trays or other trays, and the liquid descending system and the supporting system are unchanged, so that the applicability of industrial implementation is good.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;

fig. 2 is a schematic front view of an anti-clogging light-weight tray according to an embodiment of the present invention;

fig. 3 is a schematic top view of an anti-clogging lightweight tray according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of the present invention along the direction a-a of fig. 3;

fig. 5 is a schematic view of an embodiment of the present invention.

In the figure: 1. a benzene removal section; 1-1, a debenzolization rectification section; 1-2, a benzene removal stripping section; 2. an anti-clogging light tray; 3. a regeneration section; 4. a storage tank section; 5. a tray plate; 6. a down-flow plate; 7. a liquid receiving plate; 8. a V-shaped liquid baffle plate group; 8-1, an upper V-shaped liquid baffle plate group; 8-2, a lower V-shaped liquid baffle plate group; 9. a connecting plate; 10. a support beam; 11. a support ring; 12. a sleeve; 13. and (4) air lifting holes.

Detailed Description

Specific embodiments of the present invention are given below. The specific embodiments are only used for further elaboration of the invention, and do not limit the scope of protection of the claims of the present application.

The utility model provides a negative pressure debenzolization tower (see the figure 1-5), which comprises a debenzolization section 1 from the top of the tower to the tower kettle, which is positioned at the upper part, a regeneration section 3 positioned at the middle part and a storage tank section 4 positioned at the lower part; the debenzolization section 1 comprises a debenzolization rectification section 1-1 and a debenzolization stripping section 1-2; at least two layers of anti-blocking light tower trays 2 are arranged inside the debenzolization rectifying section 1-1 in a vertically staggered manner, and a plate space is reserved between every two adjacent layers of anti-blocking light tower trays 2; the debenzolization stripping section 1-2 adopts a filler structure;

the anti-blocking light-weight tower tray 2 comprises a tower tray plate 5, a down-flow plate 6, a liquid receiving tray 7, a V-shaped liquid baffle plate group 8, a connecting plate 9, a supporting beam 10, a supporting ring 11 and a sleeve 12; two ends of the precipitation liquid are fixed on the inner wall of the debenzolization rectifying section 1-1 and are vertically arranged; the edge of the liquid receiving disc 7 is welded and fixed on the inner wall of the debenzolization rectification section 1-1 and is horizontally arranged; the outer side of the support ring 11 is welded and fixed on the inner wall of the debenzolization rectification section 1-1; two symmetrical arc edges of the tower plate 5 are connected to the support ring 11; one of two straight sides of the tower plate 5 is connected with the down-flow plate 6, and the other is connected with the liquid receiving plate 7; the liquid receiving plate 7 and the liquid descending plate 6 are respectively positioned on two sides of the tray plate 5; the supporting beam 10 is welded and fixed on the inner wall of the debenzolization rectifying section 1-1, is positioned below the tray plate 5 and is used for supporting the tray plate 5; the sleeve 12 is fixed on the tray plate 5 through the support legs in a welding mode, and a bottom gap is reserved between the sleeve 12 and the tray plate 5; the tray plate 5 is provided with an air lifting hole 13, the position of the air lifting hole 13 corresponds to the sleeve 12, and the sleeve 12 is in corresponding size fit with the air lifting hole 13 and is welded in a seamless manner; the V-shaped liquid baffle plate group 8 is welded with the lower part of the tower tray plate 5 through a connecting plate 9 and is positioned at the lower part of the tower tray plate 5;

the V-shaped liquid baffle plate group 8 is divided into an upper layer V-shaped liquid baffle plate group 8-1 and a lower layer V-shaped liquid baffle plate group 8-2 in the vertical direction; a first gap is formed between the upper V-shaped liquid baffle plate group 8-1 and the tower plate 5, and a second gap is formed between the upper V-shaped liquid baffle plate group 8-1 and the lower V-shaped liquid baffle plate group 8-2; the upper V-shaped liquid baffle plate group 8-1 is formed by arranging n-1 horizontally placed V-shaped liquid baffle plates with downward openings in parallel, and the lower V-shaped liquid baffle plate group 8-2 is formed by arranging n horizontally placed V-shaped liquid baffle plates with downward openings in parallel; the V-shaped liquid baffle plates of the upper V-shaped liquid baffle plate group 8-1 and the V-shaped liquid baffle plates of the lower V-shaped liquid baffle plate group 8-2 are arranged in a staggered manner; the upper layer V-shaped liquid baffle plate group 8-1 and the lower layer V-shaped liquid baffle plate group 8-2 are symmetrically arranged at the center of the tower respectively; the position of each V-shaped liquid baffle of the lower V-shaped liquid baffle group 8-2 corresponds to the position of the air lifting holes 13, and the number of the V-shaped liquid baffles is the same as the row number of the air lifting holes 13; and in the same layer, a third gap is formed between every two adjacent V-shaped liquid baffle plates.

The air lifting hole 13 is an oblong hole; the size a of the bottom clearance is 8-15 mm; the size b of the first gap is 40-150 mm; the size c of the second gap is 50-150 mm; the size d of the third gap is determined according to the size of the air lift hole 13 and the V-shaped baffle plate.

Preferably, the packing structure is a stainless steel plate corrugated packing.

The utility model discloses a theory of operation and work flow are: the liquid phase flows to the liquid receiving disc 7 of the upper layer from the liquid descending plate 6 side of the tray plate, when the liquid phase flows through the tray plate 5, the liquid phase contacts with the rising gas from the gas rising hole 13 through the bottom gap between the sleeve 12 and the tray plate 5, the gas and the liquid contact to form a spraying state, the liquid phase is sprayed to the plate space on the tray plate 5 for mass transfer, the gas and the liquid are fully contacted, and the mass transfer efficiency is improved; the gas phase carries the liquid phase to continuously rise and impacts a lower V-shaped liquid baffle plate group 8-2 below the upper layer of the tray plate 5; when the liquid collides with the V-shaped liquid baffle of the lower V-shaped liquid baffle group 8-2, the entrained liquid phase flows downwards along the same trend and falls back to the layer; and the liquid carried in the gas continuously rising from the third gap between the lower V-shaped liquid baffle plate group 8-2 collides with the V-shaped liquid baffle plate of the upper V-shaped liquid baffle plate group 8-1 and then flows downwards along the same direction, and then flows back to the layer along the outer side of the lower V-shaped liquid baffle plate group 8-2 to prevent entrainment. Thus, the gas phase and the liquid phase are separated quickly after mass transfer, thereby greatly improving the mass transfer efficiency.

The utility model discloses the nothing is mentioned the part and is applicable to prior art.

Claims

1. A negative pressure debenzolization tower is characterized by comprising a debenzolization section positioned at the upper part, a regeneration section positioned at the middle part and a storage tank section positioned at the lower part; the debenzolization section comprises a debenzolization rectification section and a debenzolization stripping section; at least two layers of anti-blocking type light tower trays are staggered up and down inside the debenzolization rectification section, and a plate space is arranged between two adjacent layers of anti-blocking type light tower trays; the debenzolization stripping section adopts a filler structure;

2. The negative-pressure debenzolization column of claim 1, wherein the packing structure is a stainless steel plate corrugated packing.

3. The negative-pressure debenzolization tower as recited in claim 1, wherein the lift-off vents are oblong openings.

4. The negative-pressure debenzolization column as recited in claim 1, wherein the size of the bottom gap is 8-15 mm.

5. The negative-pressure debenzolization tower as recited in claim 1, wherein the V-shaped liquid baffle plate group is divided into an upper V-shaped liquid baffle plate group and a lower V-shaped liquid baffle plate group in the vertical direction; a first gap is formed between the upper V-shaped liquid baffle plate group and the tower tray plate, and a second gap is formed between the upper V-shaped liquid baffle plate group and the lower V-shaped liquid baffle plate group; the upper layer V-shaped liquid baffle plate group is formed by parallel arrangement of n-1 horizontally placed V-shaped liquid baffle plates with downward openings, and the lower layer V-shaped liquid baffle plate group is formed by parallel arrangement of n horizontally placed V-shaped liquid baffle plates with downward openings; the V-shaped liquid baffle plates of the upper V-shaped liquid baffle plate group and the V-shaped liquid baffle plates of the lower V-shaped liquid baffle plate group are arranged in a staggered manner; the upper layer V-shaped liquid baffle plate group and the lower layer V-shaped liquid baffle plate group are symmetrically arranged at the center of the tower; the position of each V-shaped liquid baffle plate of the lower V-shaped liquid baffle plate group corresponds to the position of the air lifting hole; and in the same layer, a third gap is formed between every two adjacent V-shaped liquid baffle plates.

6. The negative-pressure debenzolization tower as recited in claim 5, wherein the number of each of the V-shaped liquid-blocking plates of the lower V-shaped liquid-blocking plate group is the same as the number of rows of the lift gas holes.