Preparation device of sodium bicarbonate and carbonation tower comprising preparation device of sodium bicarbonate

Abstract

The utility model belongs to the technical field of comprehensive utilization of waste salt, and particularly relates to a sodium bicarbonate preparation device and a carbonation tower comprising the sodium bicarbonate preparation device, the preparation device comprises a reaction tower, and the reaction tower comprises a reaction tower base, a gas inlet area, a cooling area, a mushroom cap, an acidification area and a tower cover from bottom to top in the vertical direction. The utility model is improved on the basis of a Solvay carbonation tower, and provides a recycling device capable of continuously and efficiently producing sodium bicarbonate and a downstream product sodium carbonate by reacting sodium sulfate, sodium chloride or carnallite with waste ammonia gas and waste carbon dioxide through chemical conversion by referring to the thought of the soda industry field.

Description

Technical Field

[0001] The utility model belongs to the technical field of comprehensive utilization of waste salt, and relates to a sodium bicarbonate preparation device and a carbonation tower comprising the sodium bicarbonate preparation device, in particular to a device for preparing sodium bicarbonate by utilizing sodium chloride waste salt and a carbonation tower comprising the device for preparing sodium bicarbonate by utilizing sodium chloride waste salt. Background Art

[0002] With rapid industrial development, the zero-wastewater discharge process produces large quantities of sodium chloride, sodium sulfate, and their salts, which are difficult to dispose of. In line with the trend toward carbon reduction, a new resource-resource approach is to transform waste into treasure by chemically converting sodium sulfate, sodium chloride, or these salts, using ideas from the soda ash industry. This involves reacting sodium sulfate, sodium chloride, or these salts with waste ammonia and carbon dioxide to produce sodium bicarbonate, which is then used to produce soda ash.

[0003] The main process flow of the existing ammonia-soda process for preparing sodium bicarbonate is to use sodium chloride waste salt as raw material, and to prepare sodium bicarbonate through a coupled reaction with carbon dioxide and ammonia, and this reaction process involves complex mass transfer, absorption, chemical reaction, crystallization, heat transfer and other processes. The inventors have found that the existing sodium bicarbonate production device is generally only suitable for intermittent production: after a single feeding, the reaction needs to be fully completed and the reactor contents discharged before feeding again for production. Therefore, it is not suitable for continuous industrial production of sodium bicarbonate and is difficult to meet the requirements of industrial production for higher production efficiency. Moreover, the cooling water tanks in the existing sodium bicarbonate production devices are all integral structures, and the tube side (the medium flows through the channel inside the heat exchange tube and the part intersecting with it) and the shell side (the medium flows through the channel outside the heat exchange tube and the part intersecting with it) are all cast in the same structure, resulting in it being only applicable to carbonizing towers with a small pressure difference between the tube side and the shell side, making it difficult to meet the requirements of more stringent working conditions. Utility Model Content

[0004] In order to improve the deficiencies of the prior art, the utility model provides a sodium bicarbonate preparation device, the preparation device comprising a reaction tower, the reaction tower comprising a reaction tower base, an air inlet zone, a cooling zone, a cap, an acidification zone and a tower cover from bottom to top in the vertical direction;

[0005] The air inlet area includes a steam inlet, a gas distributor, and a carbon dioxide gas inlet;

[0006] The gas distributor is fixedly arranged above the steam inlet and the carbon dioxide gas inlet;

[0007] The gas distributor has an inverted cone-shaped opening, wherein the diameter of the end of the inverted cone-shaped opening relatively far from the bottom of the reaction tower body is larger than the diameter of the end relatively close to the bottom of the reaction tower body, so as to form an inverted cone;

[0008] The cooling zone includes a cooling assembly and a tower ring; wherein the cooling assembly includes a plurality of cooling water tanks arranged outside the reaction tower body in the cooling zone, a cooling water pipe for connecting two adjacent cooling water tanks, a water inlet pipe and a water outlet pipe;

[0009] The cooling water tank is a split structure, which is provided with an independent pipe box, a cooling box body and a cooling box cover.

[0010] According to an embodiment of the present invention, the cooling water tank is provided with an independently cast pipe box so as to form a separate structure with the cooling box body and the cooling box cover.

[0011] According to the embodiment of the present invention, the pipe box refers to the part connecting the two sides of the cooling water tank and the pipe pass. The pipe box is mainly used to divide the heat exchange pipes in the cooling water tank into different passes to reduce the amount of cooling water used and improve the utilization rate of cooling water.

[0012] According to an embodiment of the present invention, the gas distributor is fixedly arranged above the steam inlet and the carbon dioxide gas inlet.

[0013] According to the implementation scheme of the present utility model, the gas distributor has an inverted conical opening, and the diameter of the end of the inverted conical opening relatively farther from the bottom of the reaction tower body is larger than the diameter of the end relatively closer to the bottom of the reaction tower body, so as to form an inverted cone, so that the gas phase material is evenly distributed in the reaction tower body.

[0014] According to the implementation scheme of the present utility model, the cap is located above the gas distributor; the cap includes a cap bottom relatively close to the reaction tower body, a cap top relatively far from the reaction tower body, and a support portion for connecting the cap top and the cap bottom.

[0015] According to an embodiment of the present invention, the mushroom cap is preferably a mushroom cap with serrations around the periphery, and particularly preferably a conical mushroom cap with serrations around the periphery.

[0016] According to the embodiment of the present utility model, the carbon dioxide gas inlet is provided on the side wall of the reaction tower body in the gas inlet zone for providing reaction raw materials;

[0017] According to an embodiment of the present utility model, the preparation device further comprises an alkali outlet, which is arranged at the bottom of the reaction tower body and is used to discharge the sodium bicarbonate solid obtained by the reaction.

[0018] According to an embodiment of the present invention, the preparation device further includes a tail gas outlet, which is arranged at the top of the reaction tower body and is used to remove the tail gas generated by the reaction.

[0019] According to an embodiment of the present invention, the preparation device further comprises an ammonia-salt water inlet, which is arranged on the side wall of the reaction tower body in the acidification zone for providing reaction raw materials.

[0020] According to an embodiment of the present invention, the preparation device does not include a stirrer.

[0021] Those skilled in the art will appreciate that the ammoniacal brine may be any ammoniacal brine known to those skilled in the art, such as ammoniacal brine obtained by the Solvay process or other industrial wastewater. The ammoniacal brine may contain sodium chloride (present in the aqueous phase as sodium ions and chloride ions), or may further contain other salts, such as sodium sulfate or other miscellaneous salts. Since these salts are often treated as waste in existing processes, they may also be referred to as "waste salts" in the context of this specification.

[0022] According to an embodiment of the present invention, the preparation device further comprises a base, which is arranged at the bottom of the reaction tower body and is used to support the reaction tower body. As an example, the base can be a base with a hollow interior or a base with a non-hollow interior.

[0023] According to an embodiment of the present invention, the alkali outlet may extend into the inner space of the base.

[0024] According to the embodiment of the present invention, the steam inlet is arranged in the air inlet area of ​​the reaction tower body, which is used to regulate the ratio of NH3-CO2-H2O in the tower so that the reaction system has a desired absorption rate and the carbonation-completed liquid has a higher acidification degree, thereby producing sodium bicarbonate crystals with large particles and uniform particle size.

[0025] According to the embodiment of the present utility model, the flow path of the liquid phase material when falling is extended by providing the mushroom cap, so that the residence time of the liquid phase material in the tower is greatly prolonged, thereby achieving the purpose of fully reacting the liquid phase material and the gas phase material.

[0026] According to an embodiment of the present invention, the pipe box refers to a box containing cooling pipes.

[0027] According to an embodiment of the present invention, the number of the cooling components is preferably the same as the number of tower rings in the cooling zone.

[0028] In the context of the present invention, the term "tube pass" refers to the channel through which the medium flows in the heat exchange tube and the part that intersects with it, such as the heat exchange tube, tube box and water tank cover of the cooling water tank.

[0029] The term "shell side" refers to the channel outside the heat exchange tube through which the medium flows and the part intersecting with the heat exchange tube, for example, the part inside the cooling water tank excluding the heat exchange tube.

[0030] For example, for the cooling water tank, the tube side refers to the heat exchange tubes, tube box, and water tank cover, while the shell side refers to the interior of the water tank excluding the heat exchange tubes.

[0031] According to the embodiment of the present invention, the shell side, where pressure is relatively low, uses a thinner wall thickness to reduce the foundation bearing pressure; while the tube side, where pressure is relatively high, uses a thicker wall thickness to accommodate greater pressure shocks. Therefore, preferably, the shell side wall thickness is thinner than the tube side wall thickness.

[0032] According to the embodiment of the present invention, the reaction tower body is composed of several tower rings, and adjacent tower rings can be connected by flanges and screws to ensure sealing, or fixed by welding.

[0033] According to the implementation scheme of the present utility model, a bacterial cap is further provided between adjacent tower circles forming the reaction tower body in the acidification zone, and the ammonia salt water liquid phase material falls toward the bottom of the reaction tower body due to its own gravity, and the carbon dioxide gas phase material rises toward the top of the reaction tower body; the liquid phase material is blocked when falling to the bacterial cap, thereby extending the path of the ammonia salt water liquid phase material, and the ammonia salt water liquid phase material and the carbon dioxide gas phase material are exchanged and fully reacted to generate the desired reactants.

[0034] According to the embodiment of the present invention, the number of the several tower rings forming the reaction tower body is not particularly defined, for example, it is 5-20 segments, such as 6-18 segments, such as 8-12 segments, such as 10 segments.

[0035] According to an embodiment of the present invention, the heights of the several tower rings forming the reaction tower body are the same or different.

[0036] According to an embodiment of the present invention, the diameters of the several tower rings forming the reaction tower body are the same, for example, 1000-1500 mm, such as 1200 mm.

[0037] According to the implementation scheme of the present utility model, the heights of the several sections of tower rings forming the reaction tower body in the acidification zone are the same, the heights of the several sections of tower rings forming the reaction tower body in the cooling zone are the same, and the heights of the several sections of tower rings forming the reaction tower body in the air intake zone are the same.

[0038] According to an embodiment of the present utility model, the height of the single-stage tower ring forming the reaction tower body in the acidification zone, the height of the single-stage tower ring forming the reaction tower body in the cooling zone, and the height of the single-stage tower ring forming the reaction tower body in the air intake zone are different from each other.

[0039] According to an embodiment of the present invention, the height of the single-stage tower ring forming the reaction tower body in the cooling zone is greater than the height of the single-stage tower ring forming the reaction tower body in the acidification zone.

[0040] According to an embodiment of the present invention, the height of the single-stage tower ring forming the reaction tower body in the cooling zone is 800-1200 mm, such as 900 mm.

[0041] According to an embodiment of the present invention, the height of the single-stage tower ring forming the reaction tower body in the acidification zone is 400-800 mm, such as 500 mm.

[0042] According to the embodiment of the present invention, the number of tower rings forming the reaction tower body in the air inlet zone is 1-2 sections.

[0043] According to an embodiment of the present invention, the number of tower rings forming the reaction tower body in the cooling zone is 1-5 sections, such as 2-4 sections, such as 2-3 sections.

[0044] According to an embodiment of the present invention, the number of tower rings forming the reaction tower body in the acidification zone is 3-15 sections, such as 4-13 sections, such as 5-10 sections, such as 7 sections.

[0045] According to an embodiment of the present invention, the preparation device includes a pressure gauge port, which is arranged on the side wall of the reaction tower body in the acidification zone and is used to monitor the pressure in the reaction tower body in the acidification zone.

[0046] According to an embodiment of the present invention, the preparation device includes a temperature measuring port, which is arranged on the side wall of the reaction tower body in the acidification zone and is used to monitor the temperature inside the reaction tower body in the acidification zone.

[0047] According to the embodiment of the present utility model, the preparation device includes a cleaning water inlet, which is arranged at the top of the reaction tower body and is used to clean and remove scale generated during the reaction to restore the cooling efficiency and production capacity of the tower.

[0048] According to an embodiment of the present invention, the preparation device includes a liquid level gauge port, which is arranged at the top of the reaction tower body and is used to monitor the liquid level height in the reaction tower body in the acidification zone.

[0049] According to an embodiment of the present invention, the preparation device is a carbonization tower or a carbonation tower, in particular a carbonization tower or a carbonation tower for preparing sodium bicarbonate.

[0050] The utility model also provides a carbonating tower, which comprises the preparation device described above.

[0051] According to the present invention, the preparation device or the carbonation tower is a continuous production device.

[0052] Beneficial effects

[0053] This utility model improves upon the Solvay carbonation tower and provides a resource-based device that utilizes chemical conversion, drawing inspiration from the soda ash industry. Sodium sulfate, sodium chloride, or miscellaneous salts react with waste ammonia and waste carbon dioxide to produce sodium bicarbonate and its downstream product, sodium carbonate, in a continuous and efficient production process.

[0054] The preparation device of this utility model is equipped with a cooling water tank in the cooling zone. This water continuously circulates to remove heat generated by the reaction and the input materials, ensuring continuous and efficient reaction. More importantly, the cooling water tank of this utility model has a split structure: the shell-side portion, where pressure is lower, uses thinner walls to reduce foundation bearing pressure. The tube-side portion, where pressure is higher, uses thicker walls to accommodate greater pressure shocks.

[0055] The preparation device of the utility model can be continuously operated after the material balance of the waste salt generated upstream and other raw materials is matched, thereby eliminating the need for waste salt storage in the upstream process.

[0056] The preparation device of the present invention extends the discharge path of the tail gas after the reaction, so that the liquid phase material in the tail gas can fully utilize its own gravity to fall from the tail gas, thereby reducing the occurrence of the "liquid carrying" phenomenon and avoiding the tail gas carrying out the liquid phase material to cause environmental pollution.

[0057] The main task of the preparation device of the present invention is to convert sodium chloride, sodium sulfate and miscellaneous salts of sodium sulfate and sodium chloride in industrial wastewater, rather than to produce soda ash. Therefore, the production capacity required by a single device is much smaller than that of a carbonization tower whose main purpose is to produce soda ash. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a structural schematic diagram of the sodium bicarbonate preparation device of the present utility model.

[0059] Figure 2 It is a partially enlarged schematic diagram of the sodium bicarbonate preparation device of the present invention.

[0060] Among them, the meaning of each figure mark is as follows: 1 is the reaction tower base, 2 is the air inlet area, 3 is the steam inlet, 4 is the gas distributor, 5 is the mushroom cap, 6 is the cooling assembly, 7 is the acidification area, 8 is the ammonia salt water inlet, 9 is the pressure gauge port, 10 is the tower cover, 11 is the cleaning water inlet, 12 is the tail gas outlet, 13 is the liquid level meter port, 14 is the temperature measuring port, 15 is the cooling water outlet pipe, 16 is the cooling water inlet pipe, 17 is the carbon dioxide gas inlet, 18 is the alkali outlet, 19 is the heat exchange tube, 20 is the pipe box, and 21 is the water tank cover. DETAILED DESCRIPTION

[0061] The following will further explain the technical solutions of the present invention in conjunction with specific embodiments. It should be understood that the following embodiments are merely illustrative and explain the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included within the scope of protection intended by the present invention.

[0062] Unless otherwise specified, the experimental methods used in the following examples are conventional methods; the reagents, materials, etc. used in the following examples are all commercially available unless otherwise specified.

[0063] Example 1

[0064] This embodiment provides Figure 1 and Figure 2 The sodium bicarbonate production device (also known as a "soda tower") shown in the figure includes a reaction tower, which vertically comprises a reaction tower base 1, an air inlet area 2, a cooling area, a cap 5, an acidification area 7, and a tower cover 10;

[0065] The gas inlet area 2 includes a steam inlet 3, a gas distributor 4, and a carbon dioxide gas inlet 17;

[0066] The steam inlet 3 is used to regulate the ratio of NH3-CO2-H2O in the tower so that the reaction system has a desired absorption rate and the carbonation liquid has a higher acidification degree, thereby producing sodium bicarbonate crystals with large particles and uniform particle size;

[0067] The gas distributor 4 is fixedly disposed above the steam inlet 3 and the carbon dioxide gas inlet 17. The gas distributor 4 has an inverted conical opening, wherein the diameter of the end of the inverted conical opening farther from the bottom of the reaction tower body is larger than the diameter of the end closer to the bottom of the reaction tower body, thereby forming an inverted cone shape to uniformly distribute the gaseous material in the reaction tower body.

[0068] The cap 5 is located above the gas distributor 4. The cap 5 includes a base relatively close to the reaction tower, a top relatively far from the reaction tower, and a support portion connecting the top and base. The cap is preferably serrated, and particularly preferably a conical cap with serrations.

[0069] The cooling zone includes a cooling assembly 6 and a tower ring; wherein the cooling assembly 6 includes a plurality of cooling water tanks arranged outside the reaction tower body in the cooling zone, a cooling water pipe for connecting two adjacent cooling water tanks, a water inlet pipe 16 and a water outlet pipe 15.

[0070] Wherein, the preparation device does not include a stirrer.

[0071] Preferably, among the plurality of cooling water tanks, at least two cooling water tanks have different vertical heights, wherein the water inlet pipe 16 is connected to the cooling water tank at the bottom, and the water outlet pipe 15 is connected to the cooling water tank at the top.

[0072] In this embodiment, the cooling water tank is a split-type structure, comprising a separate pipe box, cooling box body, and cooling box cover. The pipe box connects the two sides of the cooling water tank to the tube side. It primarily serves to separate the heat exchange tubes within the cooling water tank, reducing cooling water usage and improving cooling water utilization. Furthermore, the shell side, where pressure is lower, utilizes thinner walls to reduce foundation bearing pressure. The tube side, where pressure is higher, utilizes thicker walls to accommodate greater pressure surges.

[0073] The mushroom cap 5, cooling assembly 6 and tower ring can be provided in multiples as needed.

[0074] The reaction tower body is composed of several tower rings, and adjacent tower rings can be connected by flanges and screws to ensure sealing, or can be fixed by welding.

[0075] A cap 5 is also provided between adjacent tower circles forming the reaction tower body in the acidification zone. The ammonia salt water liquid phase material falls toward the bottom of the reaction tower body due to its own gravity, and the carbon dioxide gas phase material rises toward the top of the reaction tower body; the liquid phase material is blocked when falling to the cap 5, extending the path of the ammonia salt water liquid phase material, and the ammonia salt water liquid phase material and the carbon dioxide gas phase material are exchanged and fully reacted to generate the required reactants.

[0076] In this embodiment, the number of tower rings forming the reaction tower body can be 5-20, and their heights can be the same or different as needed, and their diameters are the same, for example, 1000-1500 mm.

[0077] In this embodiment, the tower coils forming the reaction tower body in the acidification zone have the same height, the several tower coils forming the reaction tower body in the cooling zone have the same height, and the several tower coils forming the reaction tower body in the air intake zone have the same height. The height of a single-stage tower coil forming the reaction tower body in the acidification zone, the height of a single-stage tower coil forming the reaction tower body in the cooling zone, and the height of a single-stage tower coil forming the reaction tower body in the air intake zone are different from each other. The height of a single-stage tower coil forming the reaction tower body in the cooling zone is greater than the height of a single-stage tower coil forming the reaction tower body in the acidification zone. The height of a single-stage tower coil forming the reaction tower body in the cooling zone is 800-1200mm. The height of a single-stage tower coil forming the reaction tower body in the acidification zone is 400-800mm.

[0078] In this embodiment, the number of tower rings forming the reaction tower body in the air inlet zone is 1-2 stages, the number of tower rings forming the reaction tower body in the cooling zone is 1-5 stages, and the number of tower rings forming the reaction tower body in the acidification zone is 3-15 stages.

[0079] The preparation device further comprises an alkali outlet 18 , which is arranged at the bottom of the reaction tower body and is used to discharge the sodium bicarbonate solid obtained by the reaction.

[0080] In this embodiment, the preparation device further includes a tail gas outlet 12, which is provided at the top of the reaction tower body and is used to discharge the tail gas generated by the reaction.

[0081] In this embodiment, the sodium bicarbonate preparation device includes a pressure gauge port 9, which is arranged on the side wall of the reaction tower body in the acidification zone 7 and is used to monitor the pressure in the reaction tower body in the acidification zone 7.

[0082] In this embodiment, the sodium bicarbonate preparation device includes a temperature measuring port 14 , which is provided on the side wall of the reaction tower body in the acidification zone 7 and is used to monitor the temperature inside the reaction tower body in the acidification zone 7 .

[0083] In this embodiment, the sodium bicarbonate preparation device includes a cleaning water inlet 11, which is arranged at the top of the reaction tower body and is used to clean and remove scale generated during the reaction to restore the cooling efficiency and production capacity of the tower.

[0084] In this embodiment, the preparation device includes a liquid level gauge port 13 , which is disposed on the top of the reaction tower body and is used to monitor the liquid level in the reaction tower body in the acidification zone 7 .

[0085] Example 2

[0086] The ammoniacal brine obtained by the Solvay process enters the reaction tower of Example 1 from the ammoniacal brine inlet 8 (containing waste salts such as sodium chloride), flows downward, contacts the gas in the reaction tower in countercurrent, and absorbs carbon dioxide in the gas.

[0087] The carbon dioxide gas is introduced into the reaction tower through the carbon dioxide gas inlet 17. The bubbles rise along the serrated edge of the lower wall of the inverted conical opening of the gas distributor 4 to below the cap. Then, via the serrated edge of the cap, they pass through the cooling box or tower ring and rise to below the cap on the upper level, flowing in a zigzag pattern. This structure ensures that the carbonated liquid and carbon dioxide have as large a contact area and a long channel as possible, ensuring complete carbon dioxide absorption. As the gas gradually depressurizes during its ascent, the corresponding bubbles gradually increase in size. The serrated structure of equal size around the cap breaks the gas into more and smaller bubbles as it passes between the teeth, increasing its dispersion and increasing the interfacial area. Furthermore, as the gas rises in the liquid, the liquid film is constantly renewed, which is highly suitable for liquid film-controlled carbonation reactions. Furthermore, due to the significant pressure difference between the tube side and shell side of the cooling water tank, the shell side of the split cooling water tank of the present invention has lower pressure and uses thinner walls to reduce the foundation bearing pressure. The tube side, where pressure is higher, uses thicker walls to accommodate greater pressure surges.

[0088] The above is an illustrative description of the embodiments of the present invention. However, the scope of protection of this application is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art within the spirit and principles of this utility model shall be included in the scope of protection of the claims of this application.

Claims

1. A sodium bicarbonate production device, comprising a reaction tower, wherein the reaction tower comprises, from bottom to top, a reaction tower base, an air inlet zone, a cooling zone, a cap, an acidification zone, and a tower cover; The air inlet area includes a steam inlet, a gas distributor, and a carbon dioxide gas inlet; The gas distributor is fixedly arranged above the steam inlet and the carbon dioxide gas inlet; The gas distributor has an inverted cone-shaped opening, wherein the diameter of the end of the inverted cone-shaped opening relatively far from the bottom of the reaction tower body is larger than the diameter of the end relatively close to the bottom of the reaction tower body, so as to form an inverted cone; The cooling zone includes a cooling assembly and a tower ring; wherein, The cooling assembly includes a plurality of cooling water tanks arranged outside the reaction tower body in the cooling zone, a cooling water pipe for connecting two adjacent cooling water tanks, a water inlet pipe and a water outlet pipe; The cooling water tank is a split structure, which is provided with an independent pipe box, a cooling box body and a cooling box cover.

2. The preparation device according to claim 1, wherein the cooling water tank is provided with an independently cast pipe box so as to form a separate structure with the cooling box body and the cooling box cover.

3. The preparation device according to claim 1 or 2, wherein the gas distributor is fixedly arranged above the steam inlet and the carbon dioxide gas inlet.

4. The preparation device according to claim 3, wherein the gas distributor has an inverted cone-shaped opening, and the diameter of the end of the inverted cone-shaped opening relatively farther from the bottom of the reaction tower body is larger than the diameter of the end relatively closer to the bottom of the reaction tower body, so as to form an inverted cone.

5. The preparation device according to claim 4, wherein the cap is located above the gas distributor; the cap includes a cap bottom relatively close to the reaction tower body, a cap top relatively far from the reaction tower body, and a support portion for connecting the cap top and the cap bottom; The cap is a cap with serrations around it.

6. The preparation device according to claim 1 or 2, wherein the cap is a conical cap with serrations around it.

7. The preparation device according to claim 1 or 2, wherein the preparation device further comprises an ammonia salt water inlet, an alkali outlet, an exhaust gas outlet, a pressure gauge port, a temperature measuring port, a cleaning water port, a liquid level gauge port and a base.

8. The preparation device according to claim 7, wherein: The alkali outlet is arranged at the bottom of the reaction tower body; The tail gas outlet is arranged at the top of the reaction tower body; The ammoniacal brine inlet is arranged on the side wall of the reaction tower body in the acidification zone; The carbon dioxide gas inlet is arranged on the side wall of the reaction tower body in the gas inlet area.

9. The preparation device according to claim 1 or 2, wherein the pipe box includes parts connecting both sides of the cooling water tank and the pipe side.

10. A carbonating tower comprising the preparation device according to any one of claims 1 to 9; the preparation device or the carbonating tower is a continuous production device.

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