CN111495313A - Composite tray and plate tower comprising same - Google Patents
Composite tray and plate tower comprising same Download PDFInfo
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- CN111495313A CN111495313A CN202010505692.0A CN202010505692A CN111495313A CN 111495313 A CN111495313 A CN 111495313A CN 202010505692 A CN202010505692 A CN 202010505692A CN 111495313 A CN111495313 A CN 111495313A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/32—Packing elements in the form of grids or built-up elements for forming a unit or module inside the apparatus for mass or heat transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
- B01D3/324—Tray constructions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention provides a composite tray and a plate tower comprising the same, wherein the composite tray comprises an inclined tray plate and baffles arranged on the inclined tray plate, the composite tray comprises a single-tray composite tray or a double-tray composite tray, the number of the inclined tray plate is at least two, the inclination directions of two adjacent inclined tray plates are opposite, at least two baffles are arranged on each inclined tray plate, and at least one row of liquid descending holes are arranged in front of each baffle on each inclined tray plate. According to the invention, the tower plates are obliquely arranged and the plurality of baffles are arranged, so that the liquid is promoted to be updated, the liquid layer is thinned due to the step formation, and the liquid is more uniformly distributed; the liquid descending holes are arranged in front of the baffle, so that the dispersion degree of liquid is increased, the liquid is more fully contacted with a vapor phase, the entrainment is less, and the mass and heat transfer efficiency is improved; the structural design of the composite tray can reduce the pressure drop between the tray plates and reduce the space between the tray plates, thereby reducing the equipment cost and the operation cost.
Description
Technical Field
The invention belongs to the technical field of gas-liquid mass transfer equipment, and relates to a composite tower tray and a plate tower comprising the same.
Background
The plate tower is an important gas-liquid mass transfer device in the petrochemical production process, and in the production and operation of the device, on the premise of ensuring the product separation effect, a circulating reflux is generally arranged at the middle section of the tower, and the circulating reflux has the function of taking away redundant heat in the fractionating tower and using the redundant heat as a heat source of other operation units, so that the energy consumption is reduced; meanwhile, the middle section circulation reflux is adopted, so that the tower diameter can be reduced under the condition of the same treatment capacity, or the treatment capacity of the tower can be improved under the condition of the same tower diameter.
The conventional plate tower does not take special consideration to a tray of a middle reflux section, but adopts the same tray of the whole tower, and a float valve tray and a baffle tray are widely used at present. The tray of the float valve consists of an overflow weir, a downcomer and a liquid receiving tray, liquid enters the next layer of liquid receiving tray through the downcomer, then transversely flows through the tray, and passes over the overflow weir to form a liquid curtain to enter the downcomer, and the tray is complex in structure, small in gas-liquid flux and low in liquid updating speed; for the baffle type tray, a downcomer is not arranged, a downcomer hole is only arranged near an overflow weir, a small part of liquid flows down from the downcomer hole to form a liquid column, most of liquid flows over the overflow weir to form a liquid curtain, gas transversely passes through the lower part of the tray and contacts with the liquid column and the liquid curtain, and the liquid is accumulated on the wall of the tower due to gas impact to form a thick liquid layer, so that the liquid is not beneficial to updating, and the heat and mass transfer efficiency is reduced.
CN 206063827U discloses a fractionating tray and a fractionating tower, wherein the fractionating tower comprises a fractionating tower cylinder, a fractionating tray and an air-lift pipe, the fractionating tray comprises a tower plate and an overflow weir, the tower plate is vertical to the overflow weir, the tower plate is provided with a liquid-dropping hole, the fractionating tray and the fractionating tower cylinder form a groove structure, the fractionating tray is arranged in the fractionating tower cylinder in a staggered way, and the air-lift pipe is a cavity formed by the inner wall of the fractionating tower cylinder and the fractionating tray; the structure of the flow dividing device changes the paths of gas and liquid, the gas rises from the gas rising pipe, the liquid flows back in the downcomer, the gas does not need to break through the resistance of the liquid film, so that the pressure drop is reduced, but the tower tray has requirements on the flow rate of the liquid, the liquid film is difficult to form due to too low flow rate, the gas is short-circuited, and the too high flow rate is not beneficial to heat exchange.
CN 101053700A discloses a baffle type tray, which comprises a tray, wherein an overflow weir is arranged on the tray, the tray is composed of downward steps along the flowing direction of liquid, each step is provided with a sieve hole, and an arc top part which is arranged below the tray and is intersected with the tower wall of a tower from the highest step of the tray is provided with an arc guide plate inclining downwards; the arrangement of the steps on the tower plates promotes the flow of liquid and improves the mass transfer effect, but the occurrence of the steps can increase the distance between the plates, thus causing the increase of the cost of the device.
In view of the above, it is necessary to improve the internal structure of the tray column, especially the tray structure, to promote the gas-liquid mass transfer rate, enhance the separation effect, and simultaneously reduce the equipment cost as much as possible and improve the processing capacity.
Disclosure of Invention
The invention aims to provide a composite tray and a plate tower comprising the same, wherein the composite tray can enable liquid to form a ladder shape on a tower plate through the arrangement of an inclined tower plate and the arrangement of a baffle plate on the tower plate, the thickness of a liquid layer is reduced, the liquid distribution is more uniform, and the arrangement of liquid descending holes on the tower plate can increase the gas-liquid contact area and improve the mass and heat transfer efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a composite tray, which comprises inclined tower plates and baffle plates arranged on the inclined tower plates, wherein the composite tray comprises a single-tower-plate composite tray or a double-tower-plate composite tray, the single-tower-plate composite tray is provided with one inclined tower plate on the same tower body section, and the double-tower-plate composite tray is provided with two symmetrical inclined tower plates on the same tower body section;
in the single-tower-plate composite tower tray, the number of the inclined tower plates is at least two, the inclination directions of two adjacent inclined tower plates are opposite, the inclined tower plates are arched, the edges of arched arc sections are superposed with the inner side of the tower body, and a gap is reserved between the edges of straight sections and the tower body;
in the double-tower-plate composite tower tray, two inclined tower plates on the same tower body section have opposite inclination directions, the number of the inclined tower plates is at least two, one inclined tower plate in the two adjacent inclined tower plates is inclined towards the inside by taking the inner walls of the tower bodies on the two sides as a base point, a gap is reserved in the middle position, the other inclined tower plate is inclined towards the two sides by taking the middle position as a base point, and a gap is reserved in the position close to the inner walls on the two sides;
in the composite tray, at least two baffles are arranged on each inclined tower plate, one baffle is arranged at the edge of the inclined tower plate, and at least one row of down-flow holes are arranged in front of each baffle on the inclined tower plate.
According to the invention, the composite tower tray is arranged in the tower body, the tower plate is obliquely arranged and provided with the plurality of baffles, so that the liquid on the tower plate can be promoted to be updated, the flux and the overflow strength of the liquid are increased, the liquid layer is thinned due to the formation of steps, the liquid is more uniformly distributed, the liquid descending holes are arranged in front of the baffles and downwards flow through the liquid descending holes to form a plurality of liquid curtains, the dispersion degree of the liquid is increased, the vapor phase transversely flowing below the tower plate is more fully contacted, the entrainment is less, and the mass and heat transfer efficiency is improved; the arrangement of the liquid descending holes can also reduce the flow of a liquid curtain at the gap of the tower plates, thereby reducing the possibility of flooding; at the same time, the vapor phase rises from the gap, reducing the pressure drop between the trays, and thus reducing the operating costs.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
In a preferred embodiment of the present invention, the inclined plate is inclined downward in the liquid flow direction at an angle of 1 to 5 degrees, for example, 1 degree, 1.5 degrees, 2 degrees, 2.5 degrees, 3 degrees, 4 degrees, or 5 degrees, with respect to the horizontal direction, but the inclined plate is not limited to the above-mentioned values, and other values not listed in the above-mentioned range of values are also applicable.
Preferably, in the single-tray composite tray, the distance between the edge of the straight line section of the inclined tray and the tower body is 15-30% of the diameter of the tower body, such as 15%, 17.5%, 20%, 22.5%, 25%, 27.5% or 30%, but is not limited to the enumerated values, and other values not enumerated in the range of the enumerated values are also applicable.
In a preferred embodiment of the present invention, the distance between the edges of the two trays inclined inward is 7.5% to 20% of the diameter of the column, for example, 7.5%, 10%, 12.5%, 15%, 17.5%, or 20%, but the present invention is not limited to these values, and other values not listed in this range are also applicable.
Preferably, in the double-tray composite tray, the distance between the edge of the two trays inclined towards both sides and the tower body is independently 5% to 15% of the diameter of the tower body, such as 5%, 7.5%, 10%, 12.5% or 15%, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
In the invention, the tower plates on two sides in the double-tower-plate composite tower tray are symmetrically arranged, and for two tower plates which are inclined from the middle position to two sides, the middle part of the tower body is provided with the fixing component, so that the tower plates are convenient to fix.
As a preferable technical scheme of the invention, the number of the baffles on each inclined tower plate is 3-5, such as 3, 4 or 5, and the specific number is selected according to factors such as the size of the tower body, the type of the tower tray, the size of the treatment capacity and the like.
Preferably, 1-3 rows of the downcomer holes, such as 1 row, 2 rows or 3 rows, are arranged in front of each baffle on the inclined tower plate, and the selection of the number of the rows of the downcomer holes is related to factors such as the distance between the downcomer holes and the number of the baffles.
Preferably, two adjacent rows of the liquid descending holes are distributed in front of the baffle in a staggered manner.
Preferably, the distance between the down-comer holes is 2.5 to 5 times, for example 2.5 times, 3 times, 3.5 times, 4 times, 4.5 times or 5 times the diameter of the down-comer holes, but is not limited to the recited values, and other values not recited in this range are also applicable.
The invention also provides a plate tower, and the middle tower body of the plate tower adopts the composite tower tray.
As a preferable technical scheme of the invention, the middle-section tower body of the plate tower comprises the composite tower tray, a reflux extraction opening, a reflux cooler and a reflux inlet, wherein the reflux extraction opening is positioned at the lower part of the composite tower tray, the reflux inlet is positioned at the upper part of the composite tower tray, and the reflux extraction opening and the reflux inlet are connected outside the plate tower through the reflux cooler.
In the invention, the middle-section tower body is provided with the reflux extraction port and the reflux inlet for heat extraction, so that redundant heat in the tower can be timely extracted, the proper operation temperature is maintained, the energy consumption is reduced, meanwhile, the tower diameter can be reduced under the same treatment capacity by adopting a middle-section circulation mode, and the treatment capacity of the tower can be improved under the same tower diameter.
As the preferable technical scheme of the invention, the upper section tower body and the lower section tower body of the plate tower adopt common tower trays, and the tower trays on the same layer are positioned on the same horizontal plane.
Preferably, the common tray comprises a float valve tray or a baffled tray.
As the preferable technical scheme of the invention, the middle-section tower body also comprises gas guide plates which are arranged above the uppermost tower plate and below the lowermost tower plate of the composite tower tray.
In the invention, in the middle section tower body, the vapor phase transversely flows to the vapor phase rising area at the edge of the tower between the tower plates and generally rises in an S shape, and the vapor phase mainly breaks through a liquid film and vertically rises in the upper section tower body and the lower section tower body, so that when entering and leaving the middle section tower body, a gas guide plate is required to be arranged to guide the flow direction of the gas, thereby facilitating the contact of the gas phase and the liquid phase.
As a preferable technical scheme of the invention, the middle-section tower body further comprises a reflux pump, and the reflux pump is arranged on a connecting pipeline between the reflux extraction port and the reflux inlet outside the plate tower.
As a preferable technical scheme of the invention, the distance between tower plates in the middle tower body is smaller than the distance between tower plates of the upper tower body and the lower tower body.
In the invention, due to the unique structure in the middle-section tower body, the space between the tower plates can be properly reduced compared with the space between the conventional tower plates, and the tower plates can be increased under the condition of not increasing the height of the tower, thereby improving the vapor-liquid mass transfer and heat transfer efficiency of the reflux section.
In the invention, when the plate tower is adopted for fractionation, the operation process comprises the following steps:
liquid enters the composite tower tray through a tower plate downcomer where the middle-section reflux opening is positioned, a stepped liquid film is formed on the tower plate, and a liquid curtain is formed at the downcomer in front of each baffle plate by the liquid; the vapor phase flows from bottom to top in the tower, flows transversely between the tower plates to the vapor phase ascending area at the edge of the tower, and ascends in an S shape as a whole, the vapor phase flows transversely below each layer of tower plate, the liquid vertically downwards through the liquid descending holes, and the vapor phase and the liquid phase are vertically staggered with each other and can be fully contacted, thereby realizing high-efficiency mass and heat transfer and achieving the purpose of fractionation; the gas phase flows from the middle-section reflux section to the middle-section reflux section, the gas flow mode is changed from the vertical rising of the broken liquid film into S-shaped rising and then into the vertical rising of the broken liquid film, and gas guide plates are arranged above the uppermost tower plate and below the lowermost tower plate of the middle-section reflux section to guide the flow direction of the gas.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the composite tray, the tray plate is obliquely arranged and is provided with the plurality of baffles, so that the liquid on the tray plate can be promoted to be updated, the flux and overflow strength of the liquid are increased, the liquid layer is thinned due to the step formation, and the liquid distribution is more uniform;
(2) the invention arranges the down-flow holes in front of the baffle plate, and the down-flow of the down-flow holes forms a plurality of liquid curtains, thereby increasing the dispersion degree of the liquid, leading the contact with the vapor phase of the transverse flow to be more sufficient, leading the entrainment to be less and improving the mass and heat transfer efficiency;
(3) the structural design of the composite tray can reduce the pressure drop between the tray plates and reduce the space between the tray plates, thereby reducing the equipment cost and the operation cost.
Drawings
FIG. 1 is a schematic view of a partial structure of a tray column provided in example 3 of the present invention;
FIG. 2 is a schematic cross-sectional view of a composite tray provided in example 3 of the present invention;
FIG. 3 is a schematic view of a partial structure of a tray column provided in example 4 of the present invention;
FIG. 4 is a schematic cross-sectional view of a composite tray provided in example 4 of the present invention;
the system comprises a tower body 1, a reflux distribution pipe 2, a reflux inlet 3, a reflux cooler 4, a reflux pump 5, a reflux extraction outlet 6, a baffle 7, an inclined tower plate 8, a liquid descending hole 9, a common tower plate 10, a liquid descending pipe 11 and a gas guide plate 12.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the present invention, which is defined by the claims.
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides a composite tray, which comprises an inclined tower plate 8 and a baffle 7 arranged on the inclined tower plate 8, wherein the composite tray is a single-tower-plate composite tray, and the section of the same tower body 1 is provided with one inclined tower plate 8;
in the single-tower-plate composite tower tray, the number of the inclined tower plates 8 is 2, the inclination directions of two adjacent inclined tower plates 8 are opposite, the inclined tower plates 8 are arched, the edges of the arched arc sections are superposed with the inner side of the tower body 1, and a gap is reserved between the edges of the straight sections and the tower body 1;
in the composite tray, each inclined column plate 8 is provided with 4 baffles 7, one of the baffles is arranged at the edge of the inclined column plate 8, and 2 rows of downcomer holes are arranged in front of each baffle on the inclined column plate 8; two adjacent rows of the down-flow holes 9 are distributed in front of the baffle 7 in a staggered way.
The inclined tower plate 8 inclines downwards along the liquid flow direction, and the included angle between the inclined tower plate 8 and the horizontal direction is 2 degrees.
The distance between the edge of the straight line segment of the inclined tower plate 8 and the tower body 1 is 20 percent of the diameter of the tower body 1.
The distance between the liquid dropping holes 9 is 3 times of the diameter of the liquid dropping holes 9.
Example 2:
the embodiment provides a composite tray, which comprises an inclined tower plate 8 and a baffle 7 arranged on the inclined tower plate 8, wherein the composite tray is a double-tower-plate composite tray, and two symmetrical inclined tower plates 8 are arranged on the section of the same tower body 1;
in the double-tower-plate composite tower tray, two inclined tower plates 8 on the same tower body 1 section are opposite in inclination direction, the number of the inclined tower plates 8 is 4, one of the two adjacent inclined tower plates 8 is inclined inwards by taking the inner walls of the tower bodies 1 at two sides as a base point, a gap is reserved in the middle position, the other layer is inclined towards two sides by taking the middle position as a base point, and a gap is reserved at a position close to the inner walls at two sides;
in the composite tray, 3 baffles 7 are arranged on each inclined tower plate 8, one baffle is arranged at the edge of the inclined tower plate 8, and 1 row of downcomer holes are arranged in front of each baffle on the inclined tower plate 8.
The inclined tower plate 8 inclines downwards along the liquid flow direction, and the included angle between the inclined tower plate 8 and the horizontal direction is 3 degrees.
In the double-tower-plate composite tower tray, the distance between the edges of two internally inclined tower plates is 15% of the diameter of the tower body 1, and the distance between the edges of two internally inclined tower plates and the tower body 1 is 12% of the diameter of the tower body 1.
The distance between the liquid dropping holes 9 is 5 times of the diameter of the liquid dropping holes 9.
Example 3:
the embodiment provides a plate tower, a schematic view of a partial structure of the plate tower is shown in fig. 1, a middle tower body of the plate tower adopts the single-tower-plate composite tray, and the diameter of the plate tower is 2000 mm.
The middle section tower body of the plate tower comprises the single-tower-plate composite tower tray, a reflux extraction opening 6, a reflux cooler 4 and a reflux inlet 3, wherein the reflux extraction opening 6 is positioned at the lower part of the composite tower tray, the reflux inlet 3 is positioned at the upper part of the composite tower tray, the reflux inlet 3 is connected with a reflux distribution pipe 2, and the reflux distribution pipe 2 is transversely arranged in the tower body 1 and positioned above the uppermost tower plate of the composite tower tray; the reflux withdrawal port 6 is connected to the reflux inlet 3 outside the plate column via a reflux cooler 4.
The cross-sectional structure of the composite tray is schematically shown in FIG. 2, and comprises an inclined tower plate 8 and a baffle 7 arranged on the inclined tower plate 8; the number of the inclined tower plates 8 is 5, the distance between the tower plates is 400mm, the inclination directions of the adjacent two layers of inclined tower plates 8 are opposite, the inclined tower plates incline downwards along the liquid flow direction, and the included angle between the inclined tower plates and the horizontal direction is 1 degree; the inclined tower plate 8 is in an arc shape, the edge of the arc-shaped section of the arc shape is coincided with the inner side of the tower body 1, a gap is reserved between the edge of the straight line section and the tower body 1, and the width of the gap is 30% of the diameter of the tower body 1.
Each inclined column plate 8 is provided with 4 baffles 7, one baffle is arranged at the edge of the inclined column plate 8, the distance between the baffles 7 is 400mm, and the height of the baffle 7 is 50 mm; 2 rows of the down-flow holes are arranged in front of each baffle on the inclined tower plate 8, the aperture of each down-flow hole 9 is 10mm, two adjacent rows of the down-flow holes 9 are distributed in front of the baffle 7 in a staggered mode, and the distance between the down-flow holes 9 is 2.5 times of the diameter of each down-flow hole 9.
The middle-section tower body further comprises a gas guide plate 12, wherein the gas guide plate 12 comprises 2 gas guide plates which are respectively arranged above the uppermost tower plate and below the lowermost tower plate of the composite tower tray, and the distance between each gas guide plate 12 and the corresponding tower plate is 200 mm.
The middle section tower body still includes backwash pump 5, backwash pump 5 set up in 6 and 3 outside connecting pipelines in the plate tower of reflux extraction mouth.
The upper section tower body and the lower section tower body of the plate tower adopt common tower trays, and the tower trays in the same layer are positioned on the same horizontal plane; the common tray adopts a common tray 10, namely a float valve tray, and the edge of the tray is provided with a downcomer 11; the distance between the conventional trays 10 is 600 mm.
Example 4:
the embodiment provides a plate tower, a schematic view of a partial structure of the plate tower is shown in fig. 3, a tower body at the middle section of the plate tower adopts the double-tower-plate composite tray, and the diameter of the plate tower is 4000 mm.
The middle section tower body of the plate tower comprises the double-tower-plate composite tower tray, a reflux extraction opening 6, a reflux cooler 4 and a reflux inlet 3, wherein the reflux extraction opening 6 is positioned at the lower part of the composite tower tray, the reflux inlet 3 is positioned at the upper part of the composite tower tray, the reflux inlet 3 is connected with a reflux distribution pipe 2, the reflux distribution pipe 2 is transversely arranged in the tower body 1, and holes are uniformly formed in the reflux distribution pipe 2 and positioned on the tower plate at the uppermost layer of the composite tower tray; the reflux withdrawal port 6 is connected to the reflux inlet 3 outside the plate column via a reflux cooler 4.
The cross-sectional structure of the composite tray is schematically shown in FIG. 4, and comprises an inclined tower plate 8 and a baffle 7 arranged on the inclined tower plate 8; two inclined tower plates 8 on the section of the same tower body 1 are opposite in inclination direction, are inclined downwards along the liquid flow direction, and form an included angle of 4 degrees with the horizontal direction; the number of layers of the inclined tower plates 8 is 4, and the distance between the tower plates is 400 mm;
in two adjacent layers of inclined tower plates 8, one layer inclines inwards with the inner walls of the tower bodies 1 at two sides as base points, a gap is reserved in the middle position, the width of the gap is 8 percent of the diameter of the tower body 1, 5 baffles 7 are arranged on the inclined tower plates 8, one baffle is arranged at the edge of the inclined tower plate 8, the distance between the baffles 7 is 350mm, and the height of the baffle 7 is 40 mm; the other layer inclines towards two sides by taking the middle position as a base point, a gap is reserved at the position close to the inner walls of the two sides, the width of the two gaps is 5 percent of the diameter of the tower body 1, 4 baffles 7 are arranged on the inclined tower plate 8 of the layer, one baffle is arranged at the edge of the inclined tower plate 8, the distance between the baffles 7 is 400mm, and the height of the baffle 7 is 40 mm;
and 1 row of the down-flow holes are arranged in front of each baffle on the inclined tower plate 8, the aperture of the down-flow hole 9 is 20mm, and the distance between the down-flow holes 9 is 4 times of the diameter of the down-flow hole 9.
The middle-section tower body further comprises a gas guide plate 12, wherein the gas guide plate 12 comprises 2 gas guide plates which are respectively arranged above the uppermost tower plate and below the lowermost tower plate of the composite tower tray, and the distance between each gas guide plate 12 and the corresponding tower plate is 200 mm.
The middle section tower body still includes backwash pump 5, backwash pump 5 set up in 6 and 3 outside connecting pipelines in the plate tower of reflux extraction mouth.
The upper section tower body and the lower section tower body of the plate tower adopt common tower trays, and the tower trays in the same layer are positioned on the same horizontal plane; the common tray adopts a common tray 10, namely a float valve tray, and the edge of the tray is provided with a downcomer 11; the distance between the conventional trays 10 is 600 mm.
When the plate tower in the embodiment 3-4 is adopted for fractionation, middle-section reflux heat extraction can be carried out, and the operation process comprises the following steps:
liquid enters the composite tower tray through a reflux inlet, a stepped liquid film is formed on the tower plate, and a liquid curtain is formed at a liquid descending hole in front of each baffle; the vapor phase flows from bottom to top in the tower, flows transversely between the tower plates to the vapor phase ascending area at the edge of the tower, and ascends in an S shape as a whole, the vapor phase flows transversely below each layer of tower plate, the liquid flows vertically downwards through the liquid descending holes, and the vapor phase and the liquid phase are vertically staggered mutually and can be fully contacted, thereby realizing high-efficiency mass and heat transfer, achieving the purpose of fractionation, and effectively solving the problems of slow liquid renewal, low heat transfer efficiency and low processing capacity existing in the reflux tower plate at the middle section of the fractionating tower.
It can be seen from the above embodiments that the composite tray of the present invention has the advantages that the tray plate is arranged obliquely, and the plurality of baffles are arranged, so that the liquid on the tray plate can be promoted to be updated, the flux and the overflow strength of the liquid are increased, the liquid layer is thinned due to the step formation, and the liquid distribution is more uniform; the liquid descending holes are formed in front of the baffle plate and flow downwards through the liquid descending holes to form a plurality of liquid curtains, so that the dispersity of liquid is increased, the liquid is more fully contacted with a transversely flowing vapor phase, entrainment is less, and the mass and heat transfer efficiency is improved; the structural design of the composite tray can reduce the pressure drop between the tray plates and reduce the space between the tray plates, thereby reducing the equipment cost and the operation cost.
The applicant states that the present invention is illustrated by the above embodiments to show the detailed apparatus of the present invention, but the present invention is not limited to the above detailed apparatus, i.e. it is not meant to imply that the present invention must rely on the above detailed apparatus to be implemented. It will be apparent to those skilled in the art that any modifications to the present invention, equivalents of the means for substitution and addition of means for carrying out the invention, selection of specific means, etc., are within the scope and disclosure of the invention.
Claims (10)
1. The composite tower tray is characterized by comprising inclined tower plates and baffle plates arranged on the inclined tower plates, wherein the composite tower tray comprises a single-tower-plate composite tower tray or a double-tower-plate composite tower tray, the single-tower-plate composite tower tray is provided with one inclined tower plate on the same tower body section, and the double-tower-plate composite tower tray is provided with two symmetrical inclined tower plates on the same tower body section;
in the single-tower-plate composite tower tray, the number of the inclined tower plates is at least two, the inclination directions of two adjacent inclined tower plates are opposite, the inclined tower plates are arched, the edges of arched arc sections are superposed with the inner side of the tower body, and a gap is reserved between the edges of straight sections and the tower body;
in the double-tower-plate composite tower tray, two inclined tower plates on the same tower body section have opposite inclination directions, the number of the inclined tower plates is at least two, one inclined tower plate in the two adjacent inclined tower plates is inclined towards the inside by taking the inner walls of the tower bodies on the two sides as a base point, a gap is reserved in the middle position, the other inclined tower plate is inclined towards the two sides by taking the middle position as a base point, and a gap is reserved in the position close to the inner walls on the two sides;
in the composite tray, at least two baffles are arranged on each inclined tower plate, one baffle is arranged at the edge of the inclined tower plate, and at least one row of down-flow holes are arranged in front of each baffle on the inclined tower plate.
2. The composite tray as set forth in claim 1, wherein said sloped tray slopes downwardly in the direction of liquid flow, with an angle of 1-5 degrees from horizontal;
preferably, in the single-tray composite tray, the distance between the edge of the straight line section of the inclined tray and the tower body is 15-30% of the diameter of the tower body.
3. The composite tray of claim 1 or 2, wherein in the double-tray composite tray, the distance between two tray edges inclined inward is 7.5% to 20% of the diameter of the column body;
preferably, in the double-tray composite tray, the distance between the edges of two trays inclined towards two sides and the tower body is independently 5-15% of the diameter of the tower body.
4. The composite tray as set forth in any one of claims 1 to 3, wherein the number of baffles per one of said sloped trays is 3 to 5;
preferably, 1-3 rows of down-flow holes are formed in front of each baffle on the inclined tower plate;
preferably, two adjacent rows of the down-flow holes are distributed in front of the baffle in a staggered manner;
preferably, the distance between the down-flow holes is 2.5-5 times of the diameter of the down-flow holes.
5. A plate column, characterized in that the middle section of the plate column adopts the composite tray of any one of claims 1 to 4.
6. The tray column according to claim 5, wherein the mid-section column body of the tray column comprises the composite tray, a reflux extraction port located at a lower portion of the composite tray, a reflux cooler located at an upper portion of the composite tray, and a reflux inlet port connected to the reflux inlet port via the reflux cooler outside the tray column.
7. The plate tower of claim 5 or 6, wherein the upper section and the lower section of the plate tower are common trays, and the trays in the same layer are in the same horizontal plane;
preferably, the common tray comprises a float valve tray or a baffled tray.
8. The tray column according to claim 6 or 7, wherein the mid-section column body further comprises a gas deflector disposed above the uppermost tray and below the lowermost tray of the composite tray.
9. The tray column according to any of claims 6-8, wherein the mid-section column body further comprises a reflux pump, and the reflux pump is arranged on a connecting pipeline between the reflux suction port and the reflux inlet port outside the tray column.
10. The plate column according to any one of claims 6 to 9, wherein the tray pitch in the middle section of the column is smaller than the tray pitch of the upper and lower sections of the column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010505692.0A CN111495313A (en) | 2020-06-05 | 2020-06-05 | Composite tray and plate tower comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010505692.0A CN111495313A (en) | 2020-06-05 | 2020-06-05 | Composite tray and plate tower comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111495313A true CN111495313A (en) | 2020-08-07 |
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ID=71863750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010505692.0A Pending CN111495313A (en) | 2020-06-05 | 2020-06-05 | Composite tray and plate tower comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111495313A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112169363A (en) * | 2020-09-29 | 2021-01-05 | 中轻化工绍兴有限公司 | High-efficiency continuous vacuum stripping dioxane removing system |
-
2020
- 2020-06-05 CN CN202010505692.0A patent/CN111495313A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112169363A (en) * | 2020-09-29 | 2021-01-05 | 中轻化工绍兴有限公司 | High-efficiency continuous vacuum stripping dioxane removing system |
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