NL2030646B1 - Foam type rectifying tower and using method thereof - Google Patents

Foam type rectifying tower and using method thereof Download PDF

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Publication number
NL2030646B1
NL2030646B1 NL2030646A NL2030646A NL2030646B1 NL 2030646 B1 NL2030646 B1 NL 2030646B1 NL 2030646 A NL2030646 A NL 2030646A NL 2030646 A NL2030646 A NL 2030646A NL 2030646 B1 NL2030646 B1 NL 2030646B1
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Netherlands
Prior art keywords
tower
foam
gas
liquid
section
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NL2030646A
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Dutch (nl)
Inventor
Zhang Wanqing
Liang Ying
Zhang Cuige
Xu Maodong
Huang Jiangsheng
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Univ Anhui Polytechnic
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Priority to NL2030646A priority Critical patent/NL2030646B1/en
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Publication of NL2030646B1 publication Critical patent/NL2030646B1/en

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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
    • B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
    • 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
    • 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
    • B01J10/00—Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles, or apparatus specially adapted therefor
    • B01J10/002—Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles, or apparatus specially adapted therefor carried out in foam, aerosol or bubbles

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

U I T T R E K S E L The present disclosure discloses a foam—type rectifying tower and a using method thereof. The foam—type rectifying tower is provided with: a tower body, which includes a tower top, a rectifying section, and a stripping section in sequence from top to bottom; 5 wire mesh packing layers, which are respectively arranged in the tower top, the rectifying section, and the stripping section; liquid, distributors, the rectifying section, and the stripping section and are arranged above the wire mesh packing layers, where the liquid distributor in the stripping section is connected to a 10 raw material inlet pipe; a gas outlet pipe, arranged on the tower top; a condenser, connected, to the gas outlet pipe through a pipeline, where the liquid distributors in the tower top and the rectifying section are connected to the condenser through pipelines; gas—to—tower branch pipes; a reboiler,; and a liquid 15 outlet pipe, arranged on the stripping section. (+ Fig. l)

Description

P2941 /NLpd
FOAM TYPE RECTIFYING TOWER AND USING METHOD THEREOF
TECHNICAL FIELD
The present disclosure belongs to the technical field of chemical equipment, and particularly, relates to a foam-type rec- tifying tower and a using method thereof.
BACKGROUND ART
In a process of implementing the present disclosure, an in- ventor found that there are at least the following problems in the prior art:
Existing rectifying towers are divided into extraction recti- fying towers, reaction rectifying towers, constant boiling recti- fying towers, atmospheric rectifying towers, pressurized rectify- ing towers, decompression rectifying towers, azeotropic rectifying towers, heat pump rectifying towers, molecular rectifying towers, and centrifugal rectifying towers according to different operation processes thereof. Statistical data show that about 15% of the to- tal energy consumption in domestic industry comes from petrochemi- cal industry, while the energy consumption in this field mainly comes from separation links, and the operation of rectifying units accounts for the largest share (about 95%).
The existing energy-saving technology for a rectifying tower mainly includes: (1) improving and optimizing rectifying operation parameters, such as: a reflux ratio, feed thermal conditions, and the like; (2) simplifying and improving the structure of a recti- fying tower, and optimizing packing structures and materials, and the like; and (3) using a new technology, such as a heat pump and a multi-effect rectifying technology, in a rectifying process.
SUMMARY
A technical problem to be solved by the present disclosure is to provide a foam-type rectifying tower and a using method there- of, which strengthens and improves a gas-liquid heat and mass transfer interface by a foam method, so as to provide help for en-
ergy saving and consumption reduction of a rectifying process.
In order to solve the above-mentioned technical problems, the present disclosure adopts the following technical solutions: a foam type rectifying tower is provided with: a tower body, which includes a tower top, a rectifying sec- tion, and a stripping section in sequence from top to bottom; wire mesh packing layers, which are respectively arranged in the tower top, the rectifying section, and the stripping section; liquid distributors, which are respectively arranged in the tower top, the rectifying section, and the stripping section and are arranged above the wire mesh packing layers, where the liquid distributor in the stripping section is connected to a raw materi- al inlet pipe; a gas outlet pipe, arranged on the tower top; a condenser, connected to the gas outlet pipe through a pipe- line, where the liquid distributors in the tower top and the rec- tifying section are connected to the condenser through pipelines, and the condenser is connected to a product outlet pipe; gas-to-tower branch pipes, arranged on the tower body; a reboiler, communicated with the gas-to-tower branch pipes through pipelines; and a liquid outlet pipe, arranged on the stripping section and connected to the reboiler through a pipeline.
The wire mesh packing layer is metal wire mesh packing and is of a multi-layer mesh structure.
A foaming agent is arranged on the wire mesh packing layer.
A defoamer is also arranged on the tower top.
An observation hole is formed in each of the tower top, the rectifying section, and the stripping section.
There are two gas-to-tower branch pipes in total, which are respectively arranged below the wire mesh packing layers of the rectifying section and the stripping section.
The gas outlet pipe is located at the top of the tower top; and a liquid outlet pipe is located at the bottom of the stripping section.
According to a using method for the foam-type rectifying tow- er, a gas material in the rectifying tower condenses and refluxes into the tower from a condenser, flows into the tower from a tower top reflux liquid inlet branch pipe, and is sprayed on wire mesh packing after passing through liquid distributors; rising steam generated by a reboiler enters the rectifying tower through gas- to-tower branch pipes to form foam with foam films on wire mesh packing layers; a liquid phase interfacial film of the foam pro- vides a heat and mass transfer interface for a gas phase and a liquid phase; and the formed foam is broken through a defoamer above, and released gas is exhausted from a gas outlet pipe at a tower top and enters the condenser.
One of the above-mentioned technical solutions has the fol- lowing advantages or beneficial effects: the gas-liquid heat and mass transfer interface is strengthened and improved by the foam method, so as to provide the help for the energy saving and con- sumption reduction of the rectifying process.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a structural schematic diagram of a foam-type rec- tifying tower provided by an embodiment of the present disclosure.
Reference signs in above-mentioned drawings: 1-rectifying section, 2-stripping section, 3-tower top, 4-wire mesh packing layer, 5-raw material liquid inlet pipe, 6-observation hole, 7- liquid distributor, 8-foam remover, 9-gas outlet pipe, 10- condenser, 11-reflux liquid inlet branch pipe, 12-gas-to-tower branch pipe, 13-reboiler, and 14-liquid outlet pipe.
DETAILED DESCRIPTION OF THE EMBODIMENTS
To make the objective, technical solutions, and advantages of the present disclosure clearer, implementation manners of the pre- sent disclosure will be further described in detail with reference to the accompanying drawings.
Referring to FIG. 1, a packing structure in a foam-type rec- tifying tower is metal wire mesh packing. The metal wire mesh packing provides an opportunity to form foam. In order to facili- tate breaking of the foam, a defoamer is arranged above the metal wire mesh packing, so as to break the formed foam to reduce flow resistance in the tower. The structure of the foam-type rectifying tower includes a gas outlet pipe at a tower top, a defoamer, lig- uid distributors, a condenser, a tower top reflux liquid inlet pipe, wire mesh packing, a raw material liquid inlet pipe, a ket- tle liquid outlet pipe of a tower kettle, a reboiler, a reboiler gas-to-tower pipe, and observation holes. The gas outlet pipe at the tower top is connected to the condenser. A condensed liquid in the condenser enters the tower through a reflux liquid inlet branch pipe. A kettle liquid outlet pipe at the bottom of the tow- er kettle is connected to the reboiler. The gas from the reboiler enters the tower through a gas inlet branch pipe of the kettle tower. During a rectifying process, a raw material liquid enters the tower from a raw material inlet pipe in the middle of a tower body. Bn observation hole is formed above the raw material inlet pipe to observe whether there is foam accumulated above the defoamer, so as to observe the stability of the foam in the recti- fying foam.
The gas outlet pipe at the tower top is connected to the con- denser. A condensed liquid in the condenser is connected to the rectifying tower through liquid reflux pipes, is sprayed on the upper parts of the wire mesh packing layers through the liquid distributors in the tower, and forms foam through rising steam at the bottom of the tower, so as to complete a gas-liquid heat and mass transfer process in a rectifying operation. The foam is bro- ken through a defoamer. The broken liquid films enter the bottom of the tower kettle of the rectifying tower after flowing into a stripping section of the rectifying tower, and then enter the re- boiler from the liquid outlet pipe at the bottom of the tower ket- tle. A kettle liquid is heated to vaporize by the reboiler, and the obtained gas enters the tower through the gas-to-tower pipe of the reboiler. Rising gas passes through the packing layers of the stripping section and a rectifying section in sequence, passes through the defoamer, and then is exhausted from the tower through the gas outlet pipe at the tower top.
The wire mesh packing in the foam type rectifying tower con- sist of a plurality of layers of metal gauzes. The surfaces of the wire mesh packing may be of a concave-convex corrugated structure, may also be of a flat surface structure, and has good anti-
corrosion and high temperature strain resistance.
The defcoamer needs to be arranged above each wire mesh pack- ing layer in the tower to achieve a best foam breaking effect, so as to further reduce the flow resistance in the tower, and create 5 conditions for improving rectifying separating efficiency. A breaking effect of the foam in the wire mesh packing layers may be observed through the observation holes. The defoamers are arranged in the foam type rectifying tower. The defoamers are fixed to brackets on an inner surface of the tower body by bolts, and are all made of a corrosion resistant and rear resistant metal materi- al.
Both the tower top and the tower kettle are butted to the tower body by flange structures, so as to perform quick replace- ment and repair treatment on the wire mesh packing in the tower. A filling mode of the packing adopts dry assembly. During mounting, attention should be paid to fixing positions of the liquid dis- tributors above the wire mesh packing, and the wire mesh packing needs to be mounted in sequence from top to bottom.
A wire mesh packing bed structure of the foam type rectifying tower does not need a packing pressing plate (above) and a packing supporting plate (below), and the wire mesh structure only needs to be fixed to a wall surface of the tower.
The height of a multi-layer wire mesh packing bed layer in the foam type rectifying tower should not be great, so as to pre- vent adverse factors, such as the increase of flow resistance and excessive accumulation of foam. The actual height can be adjusted properly according to specific process requirements.
A working principle of the foam type rectifying tower is that: a liquid material in the rectifying tower refluxes from a condenser into the tower through a branch pipeline at a tower top, and then is sprayed on wire mesh packing after passing through liquid distributors. Rising steam generated by the reboiler forms foam with liquid films on wire meshes after entering the rectify- ing tower through a branch pipe at the bottom. A liquid phase in- terfacial film of the foam provides a large number of heat and mass transfer interfaces for a gas phase and a liquid phase. The formed foam is broken through defoamers above, and released gas is exhausted from a gas outlet pipe at the tower top and enters the condenser, and part of the released gas is recycled as a product.
After adopting the above-mentioned solution, the structure of a conventional packing type rectifying tower is improved. The de- fects that the conventional packing tower has large resistance, low flux, and large tower weight, and the like are overcome by forming the large number of foam interfaces with the help of the wire mesh packing and the foaming agent. The gas-liquid mass transfer effect may be better with the help of the gas-liquid in- terface films of the foam. The gas-liquid interface films of the foam provide a gas-liquid heat and mass transfer place for a rec- tifying operation, and a large number of solid packing surfaces are not needed, thereby greatly reducing the mass of the packing tower and the flow resistance of a fluid. In addition, the foam is quickly broken through the defoamers, which increase the fluid flux in the tower, saves the space of the packing tower, and greatly improves the rectifying separating efficiency. The space utilization rate of the packing tower is improved, the gas-liquid contact area is large, and the contact time is longer, so that the rectifying separating efficiency is greatly improved. In addition, equipment is simple in structure (without a packing pressing plate and a packing supporting plate), the equipment weight of the tower is light, the maintenance and the wire mesh mounting are conven- ient and quick, and the manufacturing cost and the production and maintenance cost of the equipment are greatly reduced.
Exemplary description is made to the present disclosure above in combination with the accompanying drawings. Apparently, specif- ic implementation of the present disclosure is not limited by the above methods. Various non-substantial improvements made as long as adopting the method conception and the technical solution of the present disclosure, or direct application of the conception and the technical solution of the present disclosure to other oc- casions without improvement all fall within the scope of protec- tion of the present disclosure.

Claims (5)

CONCLUSIESCONCLUSIONS 1. Rectificatietoren van het schuimtype, waarbij een torenlichaam van de rectificatietoren van het schuimtype een torentop, een rec- tificatiesectie en een stripsectie achtereenvolgens van boven naar beneden omvat; waarbij de torentop, de rectificatiesectie en de stripsectie allemaal zijn voorzien van een pakkingslaag van gaas en een vloeistofverdeler; waarbij de vloeistofverdelers boven de pakkingslagen van gaas zijn aangebracht; waarbij de vloeistofver- deler in de stripsectie is verbonden met een inlaatleiding voor grondstof; waarbij aan de bovenzijde van de torentop een gasaf- voerleiding is aangebracht; waarbij een zijde van de gasuitlaat- leiding via een pijpleiding is verbonden met een condensor en de andere zijde van de gasuitlaatleiding is verbonden met een produc- tuitlaat; waarbij de vloeistofverdelers in de torentop en het ge- lijkrichtgedeelte via pijpleidingen zijn verbonden met de conden- sor; waarbij gas-naar-toren aftakleidingen zijn aangebracht in het torenlichaam en via pijpleidingen in verbinding staan met een re- boiler; en waarbij een vloeistofuitlaatpijp is aangebracht aan de onderkant van de stripsectie en via een pijpleiding is verbonden met de reboiler.A foam rectification tower, wherein a tower body of the foam rectification tower includes a tower top, a rectification section and a stripping section successively from top to bottom; wherein the tower top, rectification section and stripping section are all provided with a gauze packing layer and a liquid distributor; wherein the liquid distributors are arranged above the gauze packing layers; wherein the liquid distributor in the stripping section is connected to a raw material inlet conduit; wherein a gas discharge pipe is arranged at the top of the tower top; wherein one side of the gas outlet conduit is pipelined to a condenser and the other side of the gas outlet conduit is connected to a product outlet; wherein the liquid distributors in the tower top and the rectifying section are pipelined to the condenser; wherein gas-to-tower branch lines are provided in the tower body and are pipelined to a re-boiler; and wherein a liquid outlet pipe is provided at the bottom of the stripping section and is pipelined to the reboiler. 2. Rectificatietoren van het schuimtype volgens conclusie 1, waar- bij de pakkingslaag van gaas een metalen gaaspakking is en een meerlaagse maasstructuur heeft, en een schuimmiddel is aangebracht op de pakkingslaag van gaas.The foam type rectification tower according to claim 1, wherein the mesh packing layer is a metal mesh packing and has a multilayer mesh structure, and a foaming agent is applied to the mesh packing layer. 3. Rectificatietoren van het schuimtype volgens conclusie 2, waar- bij op de torentop ook een ontschuimer is aangebracht; en een ob- servatiegat is gevormd in elk van de torentop, de rectificatiesec- tie en de stripsectie.The foam rectification tower according to claim 2, wherein a defoamer is also mounted on the tower top; and an observation hole is formed in each of the tower top, the rectification section and the stripping section. 4. Rectificatietoren van het schuimtype volgens conclusie 3, met het kenmerk, dat er in totaal twee gas-naar-toren aftakleidingen zijn, die respectievelijk zijn aangebracht onder de pakkinglagen van gaas van de rectificatiesectie en de stripsectie.4. A foam rectification tower according to claim 3, wherein there are a total of two gas-to-tower branch lines disposed under the gauze packing layers of the rectification section and the stripping section, respectively. 5. Werkwijze voor het gebruik van de rectificatietoren van het schuimtype volgens conclusies 1 tot 4, waarbij een gasmateriaal in de rectificatietoren vanuit een condensor in de toren terugvloeit en op gaaspakking wordt gesproeid nadat het door vloeistofverde- lers is gegaan; waarbij stijgende stoom gegenereerd door een re- boiler de gelijkrichttoren binnenkomt via gas-naar-toren aftak- leidingen om schuim te vormen met schuimfilms op pakkinglagen van gaas; waarbij een grensvlakfilm in de vloeibare fase van het schuim een grensvlak verschaft voor warmte- en massaoverdracht voor een gasfase en een vloeibare fase; en waarbij het gevormde schuim wordt gebroken door een ontschuimer erboven, en vrijgekomen gas wordt afgevoerd uit een gasuitlaatpijp bij een torentop en de condensor binnen komt.A method of using the foam type rectification tower according to claims 1 to 4, wherein a gas material in the rectification tower flows back from a condenser in the tower and is sprayed onto gauze packing after passing through liquid distributors; rising steam generated by a re-boiler enters the rectifier tower through gas-to-tower branch lines to form foam with foam films on mesh packing layers; wherein an interfacial film in the liquid phase of the foam provides a heat and mass transfer interface for a gas phase and a liquid phase; and wherein the foam formed is broken by a defoamer above it, and released gas is discharged from a gas outlet pipe at a tower top and enters the condenser.
NL2030646A 2022-01-21 2022-01-21 Foam type rectifying tower and using method thereof NL2030646B1 (en)

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Application Number Priority Date Filing Date Title
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Publications (1)

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NL2030646B1 true NL2030646B1 (en) 2023-08-01

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