CN115463441A - Combined rectifying tower with filler and large-aperture flow-through tower plate and rectifying method - Google Patents
Combined rectifying tower with filler and large-aperture flow-through tower plate and rectifying method Download PDFInfo
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- CN115463441A CN115463441A CN202110652534.2A CN202110652534A CN115463441A CN 115463441 A CN115463441 A CN 115463441A CN 202110652534 A CN202110652534 A CN 202110652534A CN 115463441 A CN115463441 A CN 115463441A
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- 239000000945 filler Substances 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 206
- 238000012856 packing Methods 0.000 claims abstract description 147
- 238000003825 pressing Methods 0.000 claims abstract description 31
- 238000010992 reflux Methods 0.000 claims abstract description 21
- 238000009826 distribution Methods 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000012071 phase Substances 0.000 claims description 37
- 239000007791 liquid phase Substances 0.000 claims description 32
- 230000000149 penetrating effect Effects 0.000 claims description 31
- 239000011148 porous material Substances 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 23
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 22
- 229920000642 polymer Polymers 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000007670 refining Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 3
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- UEXCJVNBTNXOEH-UHFFFAOYSA-N Ethynylbenzene Chemical group C#CC1=CC=CC=C1 UEXCJVNBTNXOEH-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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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
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
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- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
A packing and large-aperture flow-through tower plate combined rectifying tower and a rectifying method comprise the following steps: tower body, filler, tower body inner structure according to last, in, set gradually down: the upper part of the packed tower, the middle part of the packed tower and the lower part of the packed tower; the upper part and the middle part of the packed tower respectively comprise a reflux distribution pipe, a groove type liquid distributor, a packing pressing ring, a packing support and a liquid collector which are sequentially arranged from top to bottom; the lower part of the packed tower comprises an oil collecting tank, a down-flow plate, a liquid receiving disc, a large-aperture flow-through tower plate and a liquid collector which are sequentially arranged from top to bottom; the upper component and the middle component meet the requirement of separating mixed materials, the lower component can realize partial separation of components and solve the problem of blockage, and the structural combination of the upper component, the middle component and the lower component not only solves the separation requirement of products, but also reduces the risk of blockage of tower internals and prolongs the operation period of the device.
Description
Technical Field
The invention provides a combined rectifying tower with a filler and a large-aperture flow-through tower plate and a rectifying method, belonging to the technical field of rectification.
Background
In recent years, the petrochemical industry in China has been developed vigorously, a rectifying tower is one of indispensable devices in the petrochemical production process, and is a tower-type gas-liquid contact device for rectification, light components (low-boiling-point substances) in a liquid phase are transferred into a gas phase, heavy components (high-boiling-point substances) in the gas phase are transferred into the liquid phase by utilizing the property that all components in a mixture have different volatility, namely the vapor pressure of all components is different at the same temperature, so that the purpose of separation is realized, and the rectifying towers adopted at home and abroad are generally plate-type towers and packed towers.
The packed tower has the characteristics of small pressure drop, short residence time and the like, is suitable for separating foaming systems, corrosive systems, heat-sensitive systems and the like, but is easy to block the packing in a medium which is particularly easy to polymerize, such as a polymer which contains high-purity diolefin and the like and is easy to self-polymerize or interpolymerize, and seriously influences the long-term operation of the device. With the high-speed growth of economy in China, for example, styrene, isoprene, butadiene and the like have more and more requirements as monomers, and the styrene, the isoprene, the butadiene and the like have active chemical properties, are easy to self-polymerize or inter-polymerize, generate polymers and easily block tower plates. In the production process, in order to reduce the polymerization rate, vacuum operation is generally adopted, the temperature in the system is reduced, a packed tower is generally adopted as rectification equipment, monomers are polymerized more or less, and polymers are inevitably generated, and the polymers are easy to block packing by adopting the packed tower as rectification equipment, particularly the packing at the lower part is seriously blocked, so that partial shutdown is caused, and the long-term operation of a production device is not facilitated.
A petrochemical company adopts GTC extraction technology to produce styrene, and the process is firstly carried out by separating and cutting into C 8 And C 9 Two fractions, C8 fraction, are hydrogenated to remove phenylacetylene impurity, extracted, decolorized and refined to obtain styrene product, and the styrene refining tower is operated under negative pressure with stuffing for lowering pressure dropAnd (3) a tower. In the actual production process, oxygen and Fe are generated 2+ Under the action of factors such as temperature, ethylbenzene, a decolorizing agent (maleic anhydride) and the like, the copolymer of styrene and the decolorizing agent easily blocks internal parts of the tower, and after three months of operation, the filler in the refining tower is blocked for many times, thus seriously affecting the long-period operation of the device.
Based on the above-mentioned drawbacks of the prior art, it is highly desirable to invent a structure and a method that can not only retain the advantages of small pressure drop and short residence time of a packed tower, but also reduce the risk of lower blockage.
Disclosure of Invention
The invention provides a combined rectifying tower with a filler and a large-aperture flow-through tower plate, and also provides a combined rectifying method with a filler and a large-aperture flow-through tower plate, aiming at solving the technical problems that the anti-blocking capability of the filler tower in the prior art is insufficient, and polymers are easy to block the filler, especially the lower filler is seriously blocked, so that the local shutdown is caused in the prior rectifying method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a combined rectifying tower with filler and large-aperture flow-through tower plates comprises: tower body, filler, tower body inner structure sets gradually according to last, well, down: the upper part of the packed tower is formed into 1, the middle part of the packed tower is formed into 2, and the lower part of the packed tower is formed into 3;
the upper part assembly 1 of the packed tower comprises a reflux distribution pipe I11, a groove type liquid distributor I12, a packing pressing ring I13, a packing I14, a packing support piece I15 and a liquid collector I16 which are sequentially arranged from top to bottom; the lower end of the first filler is supported by a first filler supporting piece, the upper end of the first filler is tightly pressed by a first filler pressing ring, and a wall flow preventing ring is additionally arranged at a gap between the first filler and the tower wall; the filler I is horizontally arranged, the filler I is composed of a plurality of layers of fillers, the lowest layer and the filler support member form a 45-degree angle, and the layers are arranged at 90-degree angles;
the middle component 2 of the packed tower comprises a liquid collector redistributor 21, a groove type liquid distributor II 22, a packing pressing ring II 23, a packing II 24, a packing support member II 25 and a liquid collector II 26 which are sequentially arranged from top to bottom; the lower end of the second filler is supported by a second filler supporting piece, the upper end of the second filler is tightly pressed by a second filler pressing ring, and a wall flow preventing ring is additionally arranged at a gap between the second filler and the tower wall; the second filler is horizontally arranged, the second filler is composed of a plurality of layers of fillers, the lowest layer forms an angle of 45 degrees with the filler support member, and the layers are arranged at an angle of 90 degrees; the liquid collector redistributor 21 receives the liquid conveyed by the liquid collector I16;
the lower part assembly 3 of the packed tower comprises an oil collecting tank 31, a first down-flow plate 32, a liquid receiving tray 39, a first large-aperture cross-flow tower plate 33, a second down-flow plate 34, a liquid receiving tray 39, a second large-aperture cross-flow tower plate 35, a third down-flow plate 37 and a liquid collector 36 which are sequentially arranged from top to bottom; the oil collecting tank 31 receives the liquid conveyed by the second liquid collector 26;
and the first filler and the second filler are pore plate corrugated regular fillers.
The rectifying tower combined by the filler and the large-aperture flow-through tower plate is characterized in that the downcomer and the large-aperture flow-through tower plate are combined into a plurality of layers.
The rectifying tower combined by the packing and the large-aperture flow-through tower plate is characterized in that a plurality of penetrating holes 30 are uniformly distributed at the upper part of each large-aperture flow-through tower plate, a cylinder 38 with a plurality of vertically through cylindrical holes 381 is arranged corresponding to each penetrating hole, the periphery of each penetrating hole is connected with the periphery of each penetrating hole through a flange connecting plate 382 integrally connected with the periphery of the bottom of the cylinder through bolts 383, and the penetrating holes are communicated with the cylindrical holes.
The rectifying tower combined by the packing and the large-aperture flow-through tower plate is characterized in that the diameter of the cylinder 38 is 100mm, the height of the cylinder is 15mm, and the inner diameter of a cylinder hole is at least 13mm.
A combined rectification method of a packing and large-aperture flow-through tower plate comprises the following steps:
(1) The liquid phase component at the top of the tower body firstly enters the upper part of the packed tower to form a component 1,
in the upper component 1 of the packed tower, liquid phase components firstly enter a first groove type liquid distributor 12 through a first reflux distribution pipe 11, liquid is uniformly distributed in a first packing 14, a gas-liquid mass transfer place is provided through alternate contact, after gas-liquid mass transfer is carried out on the liquid phase components and gas phase components rising from vent holes into the first packing, the gas phase components rise from the vent holes to the top of the packed tower and are collected, and then are sent out of the system, and the liquid phase components are collected by a first liquid collector 16 and then enter the middle part of the packed tower of the next layer to form a component 2;
(2) The liquid after gas-liquid mass transfer enters the middle part of the packed tower to form a component 2,
in the middle component 2 of the packed tower, liquid collected by the first liquid collector 16 enters the second liquid collector redistributor 21 and the second groove-type liquid distributor 22, the liquid is uniformly distributed into the second packing 23, a gas-liquid mass transfer place is provided by alternate contact, the gas-liquid mass transfer is carried out on the gas-liquid mass transfer with gas-phase components rising from the vent holes into the second packing, and after the gas-liquid mass transfer, the gas-phase components rise from the vent holes into the first packing formed at the upper part of the packed tower to continue the gas-liquid mass transfer; the liquid phase component is collected by the second liquid collector 26 and then enters the oil collecting tank 31 of the lower component 3 of the packed tower for collection;
(3) The liquid after gas-liquid mass transfer enters the lower part of the packed tower to form a component 3,
in the lower component 3 of the packed tower, the liquid collected by the oil collecting tank 31 firstly enters a liquid receiving tray 39 and an upper layer large-aperture flow-through tower plate I33 through a first down-flow plate I32, and then carries out gas-liquid mass transfer and heat transfer with gas-phase components which rise into the flow-through tower plate I through vent holes, and then enters a next layer liquid receiving tray 39 and a large-aperture flow-through tower plate II 35 through a second down-flow plate I34 for further separation; finally, the liquid enters the liquid collector 36 through the third down-flow plate 37 and is sent out of the system after being collected.
The rectification method by combining the packing and the large-aperture flow-through tower plate is characterized in that the first packing and the second packing both adopt pore plate corrugated structured packing, the material is 316L, the operation temperature is 72-81 ℃, and the operation pressure is 11.0-12.5KPa (a) (KPa represents pressure unit, kilopascal, and (a) represents absolute pressure).
The rectification method combining the packing and the large-aperture flow-through tower plate is characterized in that a plurality of penetrating holes are uniformly distributed at the upper parts of the first large-aperture flow-through tower plate and the second large-aperture flow-through tower plate, a cylinder 38 with a plurality of vertically through cylindrical holes 381 is arranged corresponding to each penetrating hole 30, the cylinder is connected with the periphery of the penetrating hole through a bolt 383 by a flange connecting plate 382 which is integrally connected with the periphery of the bottom of the cylinder, and the penetrating holes are communicated with the cylindrical holes; the gas phase passes through the cylindrical bore.
The rectification method by combining the packing and the large-aperture flow-through tower plate is characterized in that the diameter of the cylinder 38 is 100mm, the height is 15mm, and the inner diameter of a cylinder hole is at least 13mm.
The invention has the technical characteristics that:
(1) The selection requirement of the filler is as follows: adopting orifice plate corrugated structured packing, material 316L, operating temperature of 72-81 ℃, operating pressure of 11.0-12.5KPa (a) (KPa represents pressure intensity unit, kilopascal, and (a) represents absolute pressure);
(2) The manufacturing requirements of the large-aperture flow-through tower plate are as follows: 316L material, the opening part of the tower plate is connected with a cylindrical part, the cylinder is provided with a plurality of phi 13mm cylindrical holes, the inner wall of the cylindrical hole is required to be smooth without burrs, and the diameter of the tower tray is determined according to the selected inner diameter of the tower;
(3) The packed tower comprises the following upper parts: the upper part of the packed tower mainly comprises a reflux distribution pipe, a groove type liquid distributor, a packing pressing ring, a packing support member and a liquid collector, wherein reflux liquid enters the groove type liquid distributor through the reflux distribution pipe, the liquid enters the structured packing after being uniformly distributed, a gas-liquid mass transfer place is provided by alternate contact, the structured packing is fixed through the packing pressing ring and the packing support member, after the gas-liquid mass transfer, a liquid phase component is collected by the liquid collector, and a gas phase component rises to the top of the packed tower through a vent hole;
(4) The middle part of the packed tower comprises: the middle part of the packed tower mainly comprises a liquid collector redistributor, a groove type liquid distributor, a packing pressing ring, a packing support member and a liquid collector, wherein liquid subjected to gas-liquid mass transfer enters the groove type liquid distributor, the liquid uniformly distributes and then enters the structured packing, a gas-liquid mass transfer place is provided through alternate contact, the structured packing is fixed through the packing pressing ring and the packing support member, after the gas-liquid mass transfer, a liquid phase component is collected by the liquid collector, and a gas phase component rises into the upper layer of the structured packing through a vent hole to continue the gas-liquid mass transfer;
(5) The lower part of the packed tower comprises: the lower part of the packed tower mainly comprises an oil collecting tank, a large-aperture cross-flow tower plate, a down-flow plate and a liquid collecting tower tray, wherein liquid collected by the oil collecting tank firstly enters the upper-layer large-aperture cross-flow tower plate through the down-flow plate to perform mass and heat transfer with gas-phase components, and then enters the lower-layer large-aperture cross-flow tower plate through the down-flow plate to perform further separation.
(6) According to the standard and standard requirements of regular packing manufacturing, the outer diameter of the packing is smaller than the diameter of the tower body, and pore plate corrugated regular packing is preferably selected; the gap between the filler and the tower wall is determined according to the adopted form of the wall flow prevention ring, and the wall flow prevention ring is additionally arranged at the gap between the filler and the tower wall; the regular packing is leveled, the first disc of packing and the packing supporting grid bars form an angle of 45 degrees, and the later discs of packing form an angle of 90 degrees with each other; after the filler is installed, a filler pressing ring is used for pressing properly, and the nut is screwed after the levelness is adjusted;
(7) All welding seams are continuously welded, welding slag is removed after welding, and polishing is carried out; the tower tray plate is straight without bending phenomenon, and acute angles and burrs are avoided; the center distance deviation of adjacent circular holes at the tops of all the cylindrical parts is not more than +/-0.3 mm; the inner wall of the tower where the regular packing is installed is ground flat, the craters and welding slag are removed completely, and the height of the projections is less than 2mm;
(8) The distance between the oil collecting tank and the tower tray is based on the upper surface of the supporting ring of the oil collecting tank; the distance between the trays is based on the upper surface of the tray support ring; when installing the tray plate and the channel plate, the channel plate must be vertically positioned up and down.
(9) The present invention has stuffing maintained in the upper part of the packed tower and large-aperture flow-through tower plate replaced with the lower part of the packed tower, and this can ensure the separation requirement of the rectifying tower and prolong the production period of the rectifying tower greatly. The packed tower is not suitable for treating materials containing suspended solid, the large-aperture flow-through tower plate can effectively treat the system, and the combination mode of replacing part of the packing by the large-aperture flow-through tower plate can change the technical problems that when a single tower internal part is a combined tower internal part, a certain system blocks the tower internal part and the blockage resistance of the single packed tower is insufficient,
the invention has the technical effects that: the rectifying tower combining the filler and the large-aperture flow-through tower plate can separate easily polymerized materials to obtain required products, reduce the risk of blockage of tower internals and prolong the operation period of the device.
FIG. 1 is a schematic view of a rectifying column structure of the present invention,
FIG. 2 is a cross-sectional view taken along line N-N in FIG. 1, which shows that the first filler or the second filler is composed of multiple layers, and the first disc filler 17 (the second first disc filler 27) of the first filler at the lowest layer in the first filler has an included angle of 45 degrees with the supporting frame;
figure 3 is an enlarged schematic view of the structure of the lower component 3 of the packed column according to the invention,
FIG. 4 is a schematic plan view of a large-aperture flow-through tray according to the invention,
FIG. 5 is a schematic view of the structure of the cylinder (38) of the present invention,
figure 6 is a schematic top view of a cylinder according to the present invention,
figure 7 is a schematic cross-sectional view of a cylinder according to the present invention,
FIG. 8 is a schematic view of the structure of the liquid receiving tray (39) of the present invention.
FIG. 9 is a schematic view of a liquid-receiving tray according to the present invention.
Description of the figures:
the device comprises a packed tower upper component 1, a reflux distribution pipe I11, a groove type liquid distributor I12, a packing pressing ring I13, a packing I14, a packing support piece I15, a liquid collector I16 and a first packing disc 17;
the middle part of the packed tower is composed of 2 parts of a liquid collector redistributor 21, a second groove type liquid distributor 22, a second packing pressing ring 23, a second packing 24, a second packing support 25, a second liquid collector 26 and a first disc packing 27;
the lower part composition 3 of the packed tower, an oil collecting tank 31, a first descending liquid plate 32, a first large-aperture flow-through tower plate 33, a second descending liquid plate 34, a second large-aperture flow-through tower plate 35, a liquid collector 36, a third descending liquid plate 37, a cylinder 38 and a liquid receiving disc 39; the penetrating hole 30, the cylindrical hole 381, the cylinder 38, the flange connection plate 382, the bolt 383, the clip 391 and the bolt 392;
a tower body 4;
Detailed Description
The following detailed description of the embodiments of the present invention is provided, but the present invention is not limited to the following descriptions:
referring to fig. 1-9, the invention relates to a packing and large-aperture flow-through tower plate combined rectifying tower, which comprises: tower body 4, filler, tower body inner structure sets gradually according to last, well, down: the upper part of the packed tower is composed of 1, the middle part of the packed tower is composed of 2, and the lower part of the packed tower is composed of 3;
referring to fig. 1, the upper assembly 1 of the packed tower comprises a reflux distribution pipe I11, a groove type liquid distributor I12, a packing pressing ring I13, a packing I14, a packing support piece I15 and a liquid collector I16 which are sequentially arranged from top to bottom; the lower end of the first filler is supported by a first filler support piece, the upper end of the first filler is tightly pressed by a first filler pressing ring, and a wall flow preventing ring is additionally arranged at a gap between the first filler and the tower wall; the filler I is horizontally arranged, the filler I is composed of a plurality of layers of fillers, the lowest layer and the filler support member form a 45-degree angle, and the layers are arranged at 90-degree angles;
the middle component 2 of the packed tower comprises a liquid collector redistributor 21, a groove type liquid distributor II 22, a packing pressing ring II 23, a packing II 24, a packing support member II 25 and a liquid collector II 26 which are sequentially arranged from top to bottom; the lower end of the second filler is supported by a second filler supporting piece, the upper end of the second filler is tightly pressed by a second filler pressing ring, and a wall flow preventing ring is additionally arranged at a gap between the second filler and the tower wall; the second filler is horizontally arranged, the second filler is composed of a plurality of layers of fillers, the lowest layer forms an angle of 45 degrees with the filler support member, and the layers are arranged at an angle of 90 degrees; the liquid collector redistributor 21 receives the liquid conveyed by the liquid collector I16;
the lower part composition 3 of the packed tower comprises an oil collecting tank 31, a first downcomer plate 32, a liquid receiving disc 39, a first large-aperture flow-through tower plate 33, a second downcomer plate 34, a liquid receiving disc 39, a second large-aperture flow-through tower plate 35, a third downcomer plate 37 and a liquid collector 36 which are sequentially arranged from top to bottom; the oil collecting tank 31 receives the liquid conveyed by the second liquid collector 26;
and the first filler and the second filler are pore plate corrugated regular fillers.
The rectifying tower combined by the packing and the large-aperture flow-through tower plate is characterized in that the combination of the down-flow plate and the large-aperture flow-through tower plate can be arranged into a plurality of layers.
Referring to fig. 3, 4, 5, 6, and 7, the packed and large-aperture flow-through tray combined rectifying tower is characterized in that a plurality of penetrating holes 30 are uniformly distributed on the upper part of each large-aperture flow-through tray, a cylinder 38 with a plurality of vertically through cylindrical holes 381 is arranged corresponding to each penetrating hole, and the periphery of the penetrating hole is connected with the periphery of the penetrating hole through a bolt 383 by a flange connecting plate 382 integrally connected with the periphery of the bottom of the cylinder 38, wherein the penetrating hole is communicated with the cylindrical hole.
The rectifying tower combined by the filler and the large-aperture flow-through tower plate is characterized in that the diameter of the cylinder 38 is 100mm, the height of the cylinder is 15mm, and the inner diameter of a cylinder hole is at least 13mm.
The invention relates to a method for rectifying a combination of a filler and a large-aperture flow-through tower plate, which comprises the following steps:
(1) The liquid phase component at the top of the tower body firstly enters the upper part of the packed tower to form a component 1,
in the upper component 1 of the packed tower, liquid phase components firstly enter a first groove type liquid distributor 12 through a first reflux distribution pipe 11, liquid is uniformly distributed in a first packing 14, a gas-liquid mass transfer place is provided through alternate contact, after gas-liquid mass transfer is carried out on the liquid phase components and gas phase components rising from vent holes into the first packing, the gas phase components rise from the vent holes to the top of the packed tower and are collected, and then are sent out of the system, and the liquid phase components are collected by a first liquid collector 16 and then enter the middle part of the packed tower of the next layer to form a component 2;
(2) The liquid after gas-liquid mass transfer enters the middle part of the packed tower to form a component 2,
in the middle component 2 of the packed tower, liquid collected by the first liquid collector 16 enters the second liquid collector redistributor 21 and the second groove type liquid distributor 22, the liquid is uniformly distributed into the second packing 23, a gas-liquid mass transfer place is provided by interphase contact, the gas-liquid mass transfer is carried out on the gas-liquid component which rises into the second packing from the vent hole, and after the gas-liquid mass transfer, the gas-liquid component rises into the first packing which is formed by the upper part of the packed tower on the upper layer from the vent hole to continue the gas-liquid mass transfer; the liquid phase component is collected by a second liquid collector 26 and then enters an oil collecting tank 31 of the packed tower lower part component 3 for collection;
(3) The liquid after gas-liquid mass transfer enters the lower part of the packed tower to form a component 3,
in the lower component 3 of the packed tower, liquid collected by an oil collecting tank 31 firstly enters a liquid receiving tray 39 and an upper layer large-aperture flow-through tower plate I33 through a first down-flow plate I32, and gas-liquid mass and heat transfer are carried out on gas-phase components rising into the flow-through tower plate from vent holes, and then the liquid enters a next layer of liquid receiving tray 39 and a large-aperture flow-through tower plate II 35 through a second down-flow plate II 34 for further separation; finally, the liquid enters the liquid collector 36 through the third liquid descending plate 37 and is sent out of the system after being collected.
The rectification method by combining the packing and the large-aperture flow-through tower plate is characterized in that the first packing and the second packing both adopt pore plate corrugated structured packing, the material is 316L, the operation temperature is 72-81 ℃, and the operation pressure is 11.0-12.5KPa (a) (KPa represents pressure unit, kilopascal, and (a) represents absolute pressure).
The rectification method combining the packing and the large-aperture flow-through tower plate is characterized in that a plurality of penetrating holes are uniformly distributed at the upper parts of the first large-aperture flow-through tower plate and the second large-aperture flow-through tower plate, a cylinder 38 with a plurality of vertically through cylindrical holes 381 is arranged corresponding to each penetrating hole 30, the cylinder is connected with the periphery of the penetrating hole through a bolt 383 by a flange connecting plate 382 which is integrally connected with the periphery of the bottom of the cylinder, and the penetrating holes are communicated with the cylindrical holes; the gas phase passes through the cylindrical bore.
The rectification method by combining the packing and the large-aperture flow-through tower plate is characterized in that the diameter of the cylinder 38 is 100mm, the height is 15mm, and the inner diameter of a cylinder hole is at least 13mm.
The structured packing can select orifice plate corrugated packing, and the materials, sizes, shapes and the like of the reflux distribution pipe, the groove type liquid distributor, the packing pressing ring, the packing supporting piece and the liquid collector are determined according to the selected packed tower according to the conventional selection.
The working principle of the invention and the functional action and technical characteristics of each part are as follows:
the invention utilizes the different volatility of the mixture (such as easily polymerized diolefin and self-polymer) to transfer the light component (low-boiling-point substance) in the liquid phase into the gas phase, and transfer the heavy component (high-boiling-point substance) in the gas phase into the liquid phase, thereby realizing the purpose of separation. The medium to be separated has self-aggregation property, and the operation conditions of low pressure, low temperature and short residence time are favorable for the separation of the medium, so that the separation of a packed tower is suitable for being selected, but the polymer in the medium is continuously separated along with a rectifying tower, and the polymer is concentrated to a certain degree to block the packing at the lower part, so that the long-period operation of the device is influenced.
The working process of the invention is as follows: the mixture enters a rectifying tower, firstly, heat exchange is carried out with gas rising in the tower (heat is provided by a reboiler of a tower kettle), condensed liquid-phase components enter an oil collecting tank 31 and are sent into a first large-aperture flow-through tower plate 33 through a first liquid-descending plate 32, gas-liquid two-phase mass transfer and heat transfer are carried out on the tower plate after the gas phase passes through the cylindrical hole, the liquid-phase components enter a second large-aperture flow-through tower plate 35 on the next layer through a second liquid-descending plate 34, the gas-liquid two-phase mass transfer and heat transfer are carried out in the same way, and finally liquid-phase heavy components enter the tower kettle through a third liquid collector 36 and are sent out of the device; the diameter of the cylinder 38 is 100mm, the height is 15mm, and the inner diameter of the cylinder hole is at least 13mm, so that the polymer is concentrated to a certain degree and the phenomenon of blocking a tower plate can not occur; the gas phase component gradually rises in the tower, after the mass transfer and heat transfer with the liquid phase component are carried out on the large-aperture flow-through tower plate, the gas phase component enters the second packing 24 through the gas-rising hole, the packing provides a mass transfer and heat transfer place, a target product is further separated, the liquid phase component enters the second packing in the lower layer through the liquid collector for mass transfer and heat transfer, the gas phase component enters the first packing in the upper layer 14 for mass transfer and heat transfer, the target product is further separated, the liquid phase component in the first packing enters the second packing in the lower layer, the gas phase component continuously rises, the gas phase component and the liquid phase reflux (enter the top of the rectifying tower after heat exchange is carried out through a reflux distribution pipe in a groove type liquid distributor I12, and the final product is obtained after cooling and collection.
The process of the invention is illustrated below with reference to specific examples:
example 1:
the invention relates to a packing and large-aperture flow-through tower plate combined rectifying tower and a rectifying method, which are shown in the figures, wherein the structure of the rectifying tower is not repeated as described above, and the method for solving the problem of insufficient anti-blocking capacity of the packed tower comprises the following steps:
(1) The type selection requirement of the filler is as follows: adopting pore plate corrugated structured packing, wherein the material is 316L, the operation temperature is 72-81 ℃, the operation pressure is 11.0-12.5KPa (absolute pressure), the number of packing layers is 2 (a first packing layer and a second packing layer are 2), the height of the first packing layer is 3000mm, the height of the second packing layer is 6000mm, and the inner diameter of the tower is 1600mm;
(2) The manufacturing requirements of the large-aperture flow-through tower plate are as follows: 316L materials, the opening part of the column plate is connected with a cylindrical part, the cylinder is provided with a plurality of phi 13mm cylindrical holes, the inner wall of the cylindrical hole is required to be smooth without burrs, the inner diameter of the tower is 1600mm, the number of layers of the large-aperture flow-through column plate is 4, the distance between the plates is 1000mm, the diameter of the cylinder is 100mm, the height is 15mm, and the inner diameter of the cylindrical hole is 13mm.
(3) The upper part of the packed tower comprises: the upper part of the packed tower mainly comprises a reflux distribution pipe, a groove type liquid distributor, a packing pressing ring, a packing support member and a liquid collector, wherein reflux liquid enters the groove type liquid distributor through the reflux distribution pipe, the liquid enters a regular packing after being uniformly distributed, a gas-liquid mass transfer place is provided through alternate contact, the regular packing is fixed through the packing pressing ring and the packing support member, after the gas-liquid mass transfer, a liquid-phase component is collected by the liquid collector, a gas-phase component rises to the top of the packed tower from a vent hole, the inner wall of the tower where the regular packing is installed is required to be ground flat, craters and welding slag are required to be removed completely, the height of the projection of the regular packing is less than 2mm, the regular packing is required to be horizontal, a first disc packing and a packing support grid are 45 degrees, then the angle between every disc packing is 90 degrees, after the packing is installed, the packing pressing ring is used for proper compression, and a nut is screwed after the levelness is adjusted;
(4) The middle part of the packed tower comprises: the middle part of the packed tower mainly comprises a groove type liquid distributor, a packing pressing ring, a packing support member and a liquid collector, wherein liquid subjected to gas-liquid mass transfer enters the groove type liquid distributor, the liquid uniformly distributes and then enters a structured packing, a gas-liquid mass transfer place is provided by alternate contact, the structured packing is fixed by the packing pressing ring and the packing support member, after the gas-liquid mass transfer, a liquid phase component is collected by the liquid collector, a gas phase component rises into the upper layer structured packing from a vent hole to continue the gas-liquid mass transfer, and the synchronization step (3) is required;
(5) The lower part of the packed tower comprises: the lower part of the packed tower mainly comprises an oil collecting tank, a large-aperture cross-flow tower plate, a downcomer plate and a liquid collecting tower tray, wherein liquid collected by the oil collecting tank firstly enters an upper-layer large-aperture cross-flow tower plate through the downcomer plate to perform mass and heat transfer with gas-phase components, and then enters a lower-layer large-aperture cross-flow tower plate through the downcomer plate to perform further separation.
After the scheme is implemented, the styrene refining tower does not have blockage within 1 year of operation, and the operation is stable.
Comparative example 1:
(1) The upper section, the middle section and the lower section of the styrene refining tower all adopt regular packing. The upper section mainly comprises a reflux distribution pipe, a groove type liquid distributor, a packing pressing ring, a structured packing, a packing support member and a liquid collector, wherein reflux liquid enters the groove type liquid distributor through the reflux distribution pipe, the liquid enters the structured packing after being uniformly distributed, a gas-liquid mass transfer place is provided by alternate contact, the structured packing is fixed through the packing pressing ring and the packing support member, after the gas-liquid mass transfer, a liquid phase component is collected by the liquid collector, and a gas phase component rises to the top of the packing tower through a vent hole; the middle section and the lower section mainly comprise a groove type liquid distributor, a packing pressing ring, a structured packing, a packing support member and a liquid collector, liquid subjected to gas-liquid mass transfer enters the groove type liquid distributor, the liquid enters the structured packing after uniform distribution, a gas-liquid mass transfer place is provided through alternate contact, the structured packing is fixed through the packing pressing ring and the packing support member, after the gas-liquid mass transfer, liquid phase components are collected by the liquid collector, and gas phase components rise into the upper layer structured packing through vent holes to continue the gas-liquid mass transfer.
After the scheme is implemented, the lower-layer filler is blocked after the styrene refining tower runs for 3 months, the tower pressure drop is increased, and the stable running of the device is influenced.
Comparative example 2:
(2) The styrene refining tower adopts a plate tower structure. The tower internals mainly comprise a feeding and reflux distribution pipe, a sieve tray, a down-flow plate and a liquid collecting tray, and the gas phase and the liquid phase carry out mass and heat transfer on the sieve tray.
After the scheme is implemented, because the pressure drop of the tower is large, the operating temperature is high, and after the system runs for 3 months, the polymerization of the tower kettle is serious, so that the stable running of the device is influenced, and the quality of a styrene product is influenced.
From the above results, it can be seen that: in both the packed column and the plate column, the phenomenon of plate blockage caused by local polymerization exists, and the stable operation of the device is seriously influenced.
By combining the factors, the mode of combining the filler and the large-aperture flow-through tower plate can overcome the defect of insufficient anti-blocking capability of the filled tower, reduce the pressure drop of the tower, effectively reduce the polymerization rate and prolong the operation period of the device.
The above examples are only for illustrating the technical concept and features of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. A combined rectifying tower with filler and large-aperture flow-through tower plates comprises: tower body, filler, its characterized in that, tower body inner structure according to last, in, down sets gradually to: the upper part of the packed tower is composed of (1), the middle part of the packed tower is composed of (2), and the lower part of the packed tower is composed of (3);
the upper part assembly (1) of the packed tower comprises a first reflux distribution pipe (11), a first groove type liquid distributor (12), a first packing pressing ring (13), a first packing (14), a first packing supporting piece (15) and a first liquid collector (16) which are sequentially arranged from top to bottom; the lower end of the first filler is supported by a first filler supporting piece, the upper end of the first filler is tightly pressed by a first filler pressing ring, and a wall flow preventing ring is additionally arranged at a gap between the first filler and the tower wall; the filler I is horizontally arranged, the filler I is composed of a plurality of layers of fillers, the lowest layer and the filler support member form a 45-degree angle, and the layers are arranged at 90-degree angles;
the middle component (2) of the packed tower comprises a liquid collector redistributor (21), a groove type liquid distributor II (22), a packing pressing ring II (23), a packing II (24), a packing support member II (25) and a liquid collector II (26) which are sequentially arranged from top to bottom; the lower end of the second filler is supported by a second filler support element, the upper end of the second filler is tightly pressed by a second filler pressing ring, and a wall flow preventing ring is additionally arranged at a gap between the second filler and the tower wall; the second filler is horizontally arranged, the second filler is composed of a plurality of layers of fillers, the lowest layer forms an angle of 45 degrees with the filler support member, and the layers are arranged at an angle of 90 degrees; the liquid collector redistributor (21) receives the liquid conveyed by the liquid collector I (16);
the lower part assembly (3) of the packed tower comprises an oil collecting tank (31), a first down-flow plate (32), a liquid receiving disc (39), a first large-aperture cross-flow tower plate (33), a second down-flow plate (34), a liquid receiving disc (39), a second large-aperture cross-flow tower plate (35), a third down-flow plate (37) and a liquid collector (36) which are sequentially arranged from top to bottom; the oil collecting tank (31) receives the liquid conveyed by the second liquid collector (26);
and the first filler and the second filler are pore plate corrugated regular fillers.
2. The packed, large-aperture flow-through tray combined rectification column of claim 1, wherein the combination of the downcomer and the large-aperture flow-through tray is arranged in a plurality of layers.
3. The packed and large-aperture flow-through tray combined rectifying tower as claimed in claim 1, wherein a plurality of penetrating holes (30) are uniformly distributed on the upper part of each large-aperture flow-through tray, a cylinder (38) with a plurality of cylindrical holes (381) penetrating up and down is arranged corresponding to each penetrating hole, and the periphery of the penetrating hole is connected with the periphery of the penetrating hole through a flange connecting plate (382) which is arranged on the periphery of the bottom of the cylinder and is integrally connected with the periphery of the penetrating hole through bolts (383), and the penetrating hole is communicated with the cylindrical hole.
4. A packed, large-aperture flow-through tray rectification column as claimed in claim 3, characterized in that the cylinder (38) has a diameter of 100mm and a height of 15mm, and the internal diameter of the cylinder is at least 13mm.
5. The method for rectifying the packed and large-aperture flow-through tower plate combination as recited in claim 1, characterized in that it comprises:
(1) The liquid phase component at the top of the tower body firstly enters the upper part of the packed tower to form a component (1),
in the upper component (1) of the packed tower, a liquid phase component firstly enters a first groove type liquid distributor (12) through a first reflux distribution pipe (11), liquid is uniformly distributed and enters a first packing (14), a gas-liquid mass transfer place is provided through alternate contact, after the gas-liquid mass transfer with a gas phase component rising into the first packing through a vent hole, the gas phase component rises to the top of the packed tower through the vent hole and is collected and then sent out of a system, and the liquid phase component is collected by a first liquid collector (16) and then enters the middle component (2) of the next packed tower;
(2) The liquid after gas-liquid mass transfer enters the middle part of the packed tower to form a component 2,
in the middle component (2) of the packed tower, liquid collected by the first liquid collector (16) enters a liquid collector redistributor (21) and a second groove-type liquid distributor (22), the liquid is uniformly distributed into the second packing (23), a gas-liquid mass transfer place is provided by alternate contact, gas-liquid mass transfer is carried out on the gas-liquid mass transfer with gas-phase components rising from vent holes into the second packing, and after the gas-liquid mass transfer, the gas-phase components rise from the vent holes into the first packing composed of the upper part of the packed tower to continue the gas-liquid mass transfer; the liquid phase component is collected by a second liquid collector (26) and then enters an oil collecting tank (31) of the lower component (3) of the packed tower for collection;
(3) The liquid after gas-liquid mass transfer enters the lower part of the packed tower to form a component (3),
in the lower component (3) of the packed tower, liquid collected by an oil collecting tank (31) firstly enters a liquid receiving disc (39) and an upper layer large-aperture flow-through tower plate I (33) through a first down-flow plate I (32), and gas-liquid mass and heat transfer are carried out on the liquid and gas phase components which rise into the flow-through tower plate from vent holes, and then the liquid enters a next layer of liquid receiving disc (39) and a large-aperture flow-through tower plate II (35) through a second down-flow plate II (34) for further separation; finally, the liquid enters a liquid collector (36) through a third liquid descending plate (37) and is sent out of the system after being collected.
6. The packing and large-aperture flow-through tray combined rectification method as claimed in claim 5, wherein the first packing and the second packing both adopt pore plate corrugated structured packing, the material is 316L, the operation temperature is 72-81 ℃, and the operation pressure is 11.0-12.5KPa (a) (KPa represents pressure unit, kilopascal, and (a) represents absolute pressure).
7. The packed and large-aperture flow-through tray combined rectification method as claimed in claim 5, characterized in that a plurality of penetrating holes are uniformly distributed on the upper parts of the first large-aperture flow-through tray and the second large-aperture flow-through tray, a cylinder (38) with a plurality of cylindrical holes (381) which are penetrated up and down is arranged corresponding to each penetrating hole (30), and the periphery of the penetrating holes is connected with the periphery of the penetrating holes through bolts (383) by an integrally connected flange connecting plate (382) arranged on the periphery of the bottom of the cylinder connecting plate, and the penetrating holes are communicated with the cylindrical holes; the gas phase passes through the cylindrical bore.
8. A packed, large-aperture flow-through tray rectification process according to claim 7, characterized in that the cylinder (38) has a diameter of 100mm and a height of 15mm, and the internal diameter of the cylinder is at least 13mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110652534.2A CN115463441A (en) | 2021-06-11 | 2021-06-11 | Combined rectifying tower with filler and large-aperture flow-through tower plate and rectifying method |
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| CN202110652534.2A CN115463441A (en) | 2021-06-11 | 2021-06-11 | Combined rectifying tower with filler and large-aperture flow-through tower plate and rectifying method |
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| CN2643968Y (en) * | 2003-09-17 | 2004-09-29 | 中国成达工程公司 | Combined carbinol rectifying tower |
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| CN206499894U (en) * | 2017-02-10 | 2017-09-19 | 天津辰力工程设计有限公司 | A kind of block-resistant type rectifying column for being used to handle DD mixtures |
| CN209771759U (en) * | 2018-11-16 | 2019-12-13 | 南京师范大学 | Semi-arc jet overflow type tower plate |
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- 2021-06-11 CN CN202110652534.2A patent/CN115463441A/en active Pending
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|---|---|---|---|---|
| CN2643968Y (en) * | 2003-09-17 | 2004-09-29 | 中国成达工程公司 | Combined carbinol rectifying tower |
| US20090124825A1 (en) * | 2007-11-14 | 2009-05-14 | Shanghai Huayi Acrylic Acid Co., Ltd | Method of (meth) acrylate production |
| CN202876409U (en) * | 2012-09-29 | 2013-04-17 | 山东金岭化学有限公司 | Combined coarse monomer rectification device |
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