CN112263977A - Carbonation tower and carbonation system - Google Patents
Carbonation tower and carbonation system Download PDFInfo
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- CN112263977A CN112263977A CN202011088239.0A CN202011088239A CN112263977A CN 112263977 A CN112263977 A CN 112263977A CN 202011088239 A CN202011088239 A CN 202011088239A CN 112263977 A CN112263977 A CN 112263977A
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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
- B01J19/18—Stationary reactors having moving elements inside
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/26—Carbonates or bicarbonates of ammonium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/10—Preparation of bicarbonates from carbonates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/16—Preparation from compounds of sodium or potassium with amines and carbon dioxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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Abstract
The invention relates to a preparation device of a soda industrial product, in particular to a carbonation tower and a carbonation system. The technical problem to be solved is to provide a carbonating tower, which solves the problems that the prior carbonating tower has slow nucleation speed and the tower wall is easy to scar to influence heat exchange. The carbonating tower comprises a tower body, a cooling water jacket wrapped in the middle of the tower body, an air inlet arranged at the bottom of the tower body, an air outlet arranged at the top of the tower body, a feed inlet arranged at the top of the tower body and a discharge outlet arranged at the bottom of the tower body, wherein a stirring structure is vertically arranged on the tower body from the top to the bottom.
Description
Technical Field
The invention relates to a preparation device of a soda industrial product, in particular to a carbonating tower and a carbonating tower
A carbonation system.
Background
The carbonating tower is a reaction equipment for producing saturated bicarbonate by utilizing the reaction between carbon dioxide and acid alkali liquor, and at present, the most widely used carbonating tower is still a Solvay tower which follows several basic principles of natural crystallization nucleation:
1. the feed liquid solution contacts with carbon dioxide to form a supersaturated solution;
2. naturally cooling and crystallizing the supersaturated solution under a cooling condition;
the second point is that the nucleation interface of the supersaturated solution cannot be disturbed for the natural growth of crystal nucleus, such as stirring, if the stirring easily causes the crystal grains to be too fine, the finished product is crystallized and powdered, and the product quality requirement is not satisfied.
However, if the carbonator is not stirred, the carbonator in the prior art is easy to explode and aggregate into nucleation crystals at the part close to the cooling water jacket, and the tower wall of the carbonator is scarred after a long time, so that the heat exchange and the crystallization rate are influenced, and the carbonator needs to be cleaned regularly, so that the production efficiency is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a carbonating tower, which solves the problems that the prior carbonating tower has low nucleation speed and the tower wall is easy to scar to influence heat exchange.
The carbonating tower comprises a tower body, a cooling water jacket wrapped in the middle of the tower body, an air inlet arranged at the bottom of the tower body, an air outlet arranged at the top of the tower body, a feed inlet arranged at the top of the tower body and a discharge outlet arranged at the bottom of the tower body, wherein a stirring structure is vertically arranged on the tower body from the top to the bottom.
Preferably, the stirring structure does not extend into the tower body beyond the tower body 1/2.
Preferably, a spoiler is further arranged in the tower body and close to the bottom of the tower, and spaces in the tower above the spoiler are spaced from the discharge space by the spoiler.
Preferably, a plurality of turbulence cylinders surrounding the stirring blades are arranged on the upper part of the inner wall of the tower body close to the stirring blades.
Preferably, the lower part of the tower body is provided with an air inlet, and an air distribution disc is arranged above an outlet of the air inlet.
The invention also provides a carbonation system which is formed by connecting a plurality of carbonation towers; the gas outlet of the carbonator is communicated with the gas inlets of one or more carbonator through a gas connecting pipe, or the gas inlets of the carbonator are used for independently feeding gas, the gas outlet of the carbonator directly exhausts the gas, and the two connecting modes are freely combined; the discharge hole of the carbonating tower is communicated with the feed holes of one or more carbonating towers through a feed liquid connecting pipe.
And a pump is arranged on the feed liquid connecting pipe.
The invention has the advantages that gas and liquid obtain good mass transfer conditions by stirring, after crystals are formed, the crystals can be rapidly distributed and diffused into a liquid phase, the whole process is in a dynamic state, a liquid film is continuously updated, the absorption process of carbon dioxide is accelerated, and the reaction rate is much higher than that of a tower type static state.
In addition, the invention overcomes the problems of uneven cooling or low cooling efficiency commonly existing in the existing carbonating tower, and the crystallization and cooling circulation flow is formed in the tower through the stirring structure and the spoiler, so that the crystallization speed is greatly increased, and simultaneously, the problem of uneven crystal nucleus growth is overcome.
The invention overcomes the technical prejudice that the stirring mode of a large-scale carbonization tower cannot be used, and the crystal nucleus growth is broken down by the stirring, and the granularity and the grain uniformity degree of the obtained product are far better than the best level in the market, thereby achieving unexpected technical effect.
Drawings
Fig. 1 is a schematic diagram of a carbonation tower.
Fig. 2 is a diagram of the effect of the circulation flow in the carbonation tower.
Fig. 3 is a schematic diagram of a carbonation system.
Fig. 4 is a schematic view of a spoiler structure.
In the figure, a tower body 1, a cooling water jacket 2, a spoiler 3, an air distribution plate 4, a discharge port 5, an air inlet pipe 6, stirring blades 7, a feeding port 8, a stirring shaft 9, an air outlet pipe 10 and a turbulence cylinder 11.
Detailed Description
Examples
As shown in fig. 1, the carbonation tower of the present invention comprises a tower body 1, a cooling water jacket 2, an air inlet pipe 6 arranged at the bottom of the tower, an air outlet pipe 10 arranged at the top of the tower, a feed inlet 8 and a discharge outlet 5, a stirring shaft 9 arranged inside the tower body, and a stirring blade 7 fixed on the stirring shaft 9, wherein a spoiler 3 is fixed at the inner side of the tower body.
The gas distribution plate 4 is disc-shaped, a plurality of exhaust holes are formed in the plate surface, and any exhaust hole and the gas inlet pipe 6 are connected and provided with a channel as shown in figure 1, so that carbon dioxide gas flow can be uniformly filled into the whole carbonation tower and is fully contacted with feed liquid.
Compared with the Solvay tower in the prior art, the carbonation tower provided by the invention is internally provided with the stirring structure, and the arrangement of the stirring structure is favorable for increasing the contact interface between carbon dioxide and feed liquid, but theoretically is not favorable for the growth of crystal nuclei.
For example, in actual production, a mushroom cap type carbonator is generally adopted in a large factory, and the typical structure is the solvation tower, which is the most common tower type. The existing carbonating tower is static mass transfer crystallization. The prior literature shows that stirring the solution is not beneficial to the growth of crystal nucleus, and the crystal size is small. Such as: the particle size distribution characteristics of the crushed crystal nuclei formed in the collision nucleation process are highlighted in the third conclusion of the study of Tianjin science and technology university, volume 24, phase 1, month 2 in 2009, that the change of the stirring speed has a more obvious influence on the collision nucleation of the large-particle crystals. In combination with relevant literature and the condition of using a static mass transfer carbonization tower in actual production, the stirring is basically determined to be not beneficial to the growth of crystals in the carbonization process, so that the granularity of the crystals is not high.
The theoretical and practical experiences are the same, so how to improve the reaction rate and simultaneously avoid the crystal nucleus growth interruption (the crystal nucleus growth interruption easily causes crystal powdering, and the product granularity cannot meet the requirement), the invention provides a thought: regular circulation is formed in the tower body by arranging the turbulence component in the closed tower body, when the circulation passes through the stirring blades, the feed liquid and the carbon dioxide are subjected to full mixing reaction to produce a product, the solution containing the saturated product is naturally crystallized when the circulation passes through the wall surface of the tower body and is contacted with the cooling water jacket, and the environment (mainly the concentration and the temperature of the reaction product) around the crystal is kept in a stable state in the crystallization process, so that the phenomenon that the environment of the reaction liquid in the tower is constantly changed due to stirring and the crystal nucleus is not beneficial to growth is avoided.
In order to achieve the above effect, the invention is provided with a plurality of turbulence cylinders 11 arranged around the stirring blades at the upper part of the inner wall of the tower body near the stirring blades, the turbulence cylinders 11 are designed according to the number of the stirring blades, for example, fig. 1 designs three sections of stirring blades 7, the larger the size of the stirring blade is near the tower top, the smaller the blade diameter is near the spoiler 3, and similarly, the size of the turbulence cylinder 11 designed around the stirring blade should be also adaptively arranged along with the diameter of the stirring blade.
The aim of this is to reduce as much as possible the turbulence phenomenon (turbulence is the irregular flow generated by the stirring of the stirring blades) at the lower part of the tower body, which is unfavorable for maintaining the regular circulation of the solution in the tower, and the lower part of the tower body is a dense area for crystallization and nucleation, and the supersaturated reaction solution is delivered from the top of the tower downwards through the stirring blades and is transferred through the first-stage stirring blades, and is fully mixed with the carbon dioxide, and when the supersaturated reaction solution is delivered to the area close to the nucleation, the turbulence should be reduced as much as possible, and the environmental stability of the circulation should be ensured. In order to make the circular current flow to the cooling water jacket (namely the cooling area of the tower body) regularly, the invention also arranges a spoiler 3 at the lower part of the tower, wherein the spoiler 3 is composed of a plurality of discontinuous arc-shaped plates, and the central line which is penetrated by the stirring shaft is taken as the central line and is arranged around the inner wall of the tower body.
As shown in figure 2, under the combined action of the stirring blades 7, the turbulence cylinder 11 and the turbulence plate 3, uniform circulation flow can be formed in the tower, the circulation flow circularly flows from the top of the tower through the nucleation spaces among the stirring blades 7, the turbulence plate 3, the turbulence cylinder and the cooling water jacket, and excessive products generated in the flowing process can naturally settle to the bottom of the tower.
Furthermore, in order to reduce the turbulence phenomenon as much as possible, the invention can also arrange the stirring blades with different rotating speeds, and the rotating speed of the blades closer to the spoiler 3 is lower, so that the supersaturated reaction solution can avoid the instability of the nucleation environment when entering the nucleation zone.
The liquid entering from the feed inlet 8 of the invention is feed liquid, namely carbonated liquid, such as ammonium salt brine (producing soda ash), soda ash (producing sodium bicarbonate) or ammonia water (producing ammonium bicarbonate), the feed liquid enters the tower body to fill the inner space of the tower body, and is finally discharged from the discharge outlet 5 to enter the next working procedure. The gas entering the gas inlet pipe 6 is carbon dioxide gas, when the feed liquid enters the tower body, the carbon dioxide gas enters the tower body and is blocked by the gas distribution plate 4, the gas is dispersed and fully mixed with the feed liquid, meanwhile, the stirring shaft 9 is driven by the motor to rotate, the stirring blade 7 is used for stirring a gas-liquid mixed phase, and the carbon dioxide gas is discharged from the gas outlet 10 after flowing through the whole feed liquid and enters the next working procedure.
The number of carbonator towers can be set according to the production requirement, and the carbonator towers can be connected in series or in parallel, and generally 3-7, preferably 4, as shown in fig. 2. The invention adopts a mode of connecting a plurality of carbonating towers in series, and belongs to multiple carbonating. The present solvation tower uses a single carbonation process, the height of the tower is usually between 25 and 30 meters, the comparison between the single carbonation and the double carbonation in the combined production of soda ash and ammonium chloride is analyzed in the second edition of soda ash engineering, page P436, and the conclusion is that: the primary carbonation has the advantages of simple production flow, control of comparative solution, less ammonia absorption amount of the mother liquor I, less volatilization loss of ammonia and better operation conditions due to the fact that the vapor pressure of ammonia in the solution is crossed at the bottom in the processes of adding salt, freezing and separating the mother liquor II from ammonium chloride in the ammonia mother liquor I. The sodium bicarbonate product is higher in the primary carbonation. However, after the carbonating tower of the present invention is adopted, the result is obviously better than the result of one-time carbonating of the solvay carbonating tower.
Specific parameters and relative comparisons of the baking soda product produced by the process of the invention and the products of world-known brand manufacturers are shown in table 1.
TABLE 1 comparative analysis of baking soda
From the analysis in table 1, it is seen that the chloride ion content of the baking soda product of the present invention is significantly lower than the best level in the market, 2 orders of magnitude lower than the standard specification. The specific gravity of the product is generally higher than the best level in the market, and is more obviously higher than the pharmaceutical specification. The fluidity is better.
Claims (7)
1. A carbonating tower comprises a tower body, a cooling water tank, an air inlet pipe, an air outlet pipe, a feed inlet and a discharge outlet, wherein the air inlet pipe, the air outlet pipe, the feed inlet and the discharge outlet are arranged on the tower body.
2. The carbonation tower according to claim 1, wherein said agitation structure does not extend into the tower body beyond tower body 1/2.
3. The carbonation tower according to claim 1, wherein a baffle is further positioned within the tower body adjacent the bottom of the tower, said baffle separating the discharge space from the internal space above the baffle.
4. The carbonation tower according to claim 1, wherein said tower body is provided with an air inlet at a lower portion thereof, and an air distribution plate is provided above an outlet of said air inlet.
5. The carbonation tower according to claim 1, wherein a turbulence cylinder is further provided outside the stirring blade.
6. The carbonation tower according to claim 1, wherein a baffle plate is secured to the inside of said tower body.
7. A carbonation system comprising a carbonation tower according to any one of claims 1 to 7 and comprising a plurality of carbonation towers connected together; the gas outlet pipe of the carbonator is communicated with the gas inlet pipes of one or more carbonator through gas connecting pipes, or the gas inlet pipes of the carbonator are independently used for gas inlet, the gas outlet pipe of the carbonator directly exhausts gas, and the two connection modes are freely combined; the discharge hole of the carbonating tower is communicated with the feed holes of one or more carbonating towers through a feed liquid connecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011088239.0A CN112263977A (en) | 2020-10-13 | 2020-10-13 | Carbonation tower and carbonation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011088239.0A CN112263977A (en) | 2020-10-13 | 2020-10-13 | Carbonation tower and carbonation system |
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| CN112263977A true CN112263977A (en) | 2021-01-26 |
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| CN202011088239.0A Pending CN112263977A (en) | 2020-10-13 | 2020-10-13 | Carbonation tower and carbonation system |
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2020
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