Combined soda ash carbonization tower

Abstract

The present application relates to the field of alkali production, and particularly relates to a combined alkali production soda ash carbonization tower, which comprises a tower body and a tower plate assembly, the tower plate assembly comprises a cap and a sieve plate, sieve holes are formed in the bottom of the sieve plate, a flow guide pipe is connected downward in the sieve holes, a rotating pipe is coaxially arranged on the flow guide pipe, the rotating pipe is rotationally connected with the flow guide pipe, the bottom of the rotating pipe is connected with a curved pipe, the rotating pipe is connected to the middle of the curved pipe, and liquid outlets are arranged at the two ends of the curved pipe, the present application has the following beneficial effects: the ammonia mother liquor flows out of the sieve holes and is sprayed by the curved pipe, so that the ammonia mother liquor is more fully contacted with the carbon dioxide gas, the flow speed of the carbon dioxide gas is increased by the rotation of the fan blades, the absorption efficiency of the ammonia mother liquor for the carbon dioxide gas is further increased, and the reaction is more sufficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of alkali production, in particular to a soda carbonization tower for combined alkali production. BACKGROUND

[0002] The combined method of alkali production is a process of producing soda by using sodium chloride, carbon dioxide, ammonia and water as raw materials, and by-produced ammonium chloride. Soda is a basic chemical raw material, which is widely used and plays an important role in the national economy. Ammonium chloride is mainly used as agricultural fertilizer, but its quality affects the development of soda industry. The combined method of alkali production is also known as Hou's method of alkali production.

[0003] The carbonization tower is a key equipment for combined alkali production, which is mainly used for producing high-quality large-particle heavy soda crystals. The working principle is as follows: the ammonia mother liquor is added from the top of the tower body, and the carbon dioxide is added from the bottom of the tower body, and the sodium bicarbonate crystals are generated by the reaction of the ammonia mother liquor and the carbon dioxide. Therefore, whether the ammonia mother liquor is fully contacted and reacted with the carbon dioxide is an important factor affecting the product quality.

[0004] In the conventional carbonization tower in the prior art, a cap and a sieve plate are arranged, and when the ammonia mother liquor flows on the cap and the sieve plate, it is fully spread, thereby increasing the contact area between the ammonia mother liquor and the carbon dioxide, and making the ammonia mother liquor fully react with the carbon dioxide. This technical solution improves the absorption efficiency of the ammonia mother liquor to the carbon dioxide to a certain extent, but there is still room for improvement in the reaction. SUMMARY

[0005] The present application aims to provide a soda carbonization tower for combined alkali production, which has the characteristics of improving the absorption efficiency of the ammonia mother liquor to the carbon dioxide and making the reaction more sufficient.

[0006] The above technical object of the present application is achieved by the following technical solution: a soda carbonization tower for combined alkali production, comprising a tower body and a tower plate assembly, the tower plate assembly comprising a cap and a sieve plate, a sieve hole is formed in the bottom of the sieve plate, a flow guide pipe is connected downward in the sieve hole, a rotating pipe is coaxially arranged on the flow guide pipe, the rotating pipe is rotatably connected with the flow guide pipe, the bottom of the rotating pipe is connected with a curved pipe, the rotating pipe is connected to the middle of the curved pipe, and liquid outlets are arranged at both ends of the curved pipe.

[0007] By adopting the above technical solution, when the ammonia mother liquor flows on the sieve plate, it enters the flow guide pipe through the sieve hole, and then enters the curved pipe through the rotating pipe, and finally flows out from the liquid outlets. Since the curved pipe is S-shaped, the curved pipe rotates under the impact of the liquid when the ammonia mother liquor flows in the curved pipe, and then the ammonia mother liquor flowing out of the liquid outlets is subjected to the horizontal force in addition to the gravity, so that the ammonia mother liquor is spread out of the liquid outlets. Therefore, the ammonia mother liquor can be fully contacted with the carbon dioxide in the tower body before flowing onto the cap and the sieve plate, thereby improving the absorption efficiency of the ammonia mother liquor to the carbon dioxide and making the reaction more sufficient.

[0008] Preferably, there are three liquid outlets located at the bottom of the curved tube, with the three outlets located at both ends and the middle of the curved tube, respectively.

[0009] By adopting the above technical solution, an outlet is added in the middle of the curved tube, which increases the flow rate of ammonia mother liquor in the curved tube.

[0010] Preferably, a bearing is connected between the guide tube and the rotating tube, with the inner ring of the bearing fixedly connected to the outer wall of the guide tube and the outer ring of the bearing fixedly connected to the inner wall of the rotating tube.

[0011] By adopting the above technical solution, the guide tube and the rotating tube are connected by bearings, so that the rotating tube can rotate coaxially with respect to the guide tube.

[0012] Preferably, fan blades are connected to the curved tube.

[0013] By adopting the above technical solution, the curved tube drives the fan blades to rotate when it rotates, thereby promoting the flow rate of carbon dioxide in the tower body and further enabling the carbon dioxide to fully contact the ammonia mother liquor.

[0014] Preferably, there are two fan blades, located on opposite sides of the curved tube along its length.

[0015] By adopting the above technical solution, the rotation of two fan blades promotes the flow of carbon dioxide gas inside the tower.

[0016] Preferably, a gas delivery pipe is provided on the inner wall of the tower along its height direction, and the gas delivery pipe delivers carbon dioxide gas between two adjacent tower plate assemblies.

[0017] By adopting the above technical solutions, the distribution of carbon dioxide gas inside the tower is made more uniform.

[0018] Preferably, an annular tube is provided between two adjacent tray assemblies, and several air outlets are provided on the inner side of the annular tube along its circumference.

[0019] By adopting the above technical solution, the distribution of carbon dioxide gas in the space between two adjacent tray assemblies is made more uniform.

[0020] Preferably, the direction of the air outlet follows the movement trajectory of the fan blades.

[0021] By adopting the above technical solution, when the carbon dioxide delivery speed is increased, the carbon dioxide ejected from the outlet can blow the fan blades, thereby driving the curved tube to rotate, making the ammonia mother liquor more violently sprayed, and allowing the ammonia mother liquor to come into further contact with the carbon dioxide gas, in order to match the increase in the carbon dioxide gas delivery speed.

[0022] In summary, the present invention has the following beneficial effects: the ammonia mother liquor flows out of the sieve holes and is sprayed by the curved tube, so that it has more sufficient contact with carbon dioxide gas. At the same time, the rotation of the fan blades increases the flow speed of carbon dioxide gas, thereby accelerating the absorption efficiency of carbon dioxide gas by the ammonia mother liquor and making the reaction more complete. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the tower structure in the embodiment;

[0024] Figure 2 yes Figure 1 Enlarged diagram of section A in the middle;

[0025] Figure 3 This is a top view of the curved tube in the embodiment.

[0026] In the diagram, 1 is the tower body; 2 is the tower plate assembly; 21 is the mushroom cap; 22 is the sieve plate; 23 is the sieve hole; 3 is the guide pipe; 31 is the rotating pipe; 32 is the bearing; 4 is the curved pipe; 41 is the liquid outlet; 42 is the fan blade; 5 is the gas transmission pipe; 51 is the ring pipe; and 52 is the gas outlet. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0029] Example: A soda ash carbonation tower for combined alkali production, such as... Figure 1 As shown, a gas delivery pipe 5 for conveying carbon dioxide gas is vertically installed on the inner wall of the tower body 1. The lower end of the gas delivery pipe 5 extends to the outside of the tower body 1 for connecting to a carbon dioxide gas source. Five sets of tray assemblies 2 are installed inside the tower body 1 along its height direction. Each tray assembly 2 includes a cap 21 and a sieve plate 22. A circular annular pipe 51 is installed between each adjacent tray assembly 2, and the annular pipe 51 is connected to the gas delivery pipe 5.

[0030] like Figure 2As shown, a sieve hole 23 is provided at the center of the bottom of the sieve plate 22. A guide tube 3 is connected downward through the sieve hole 23, and a rotating tube 31 is vertically connected to the end of the guide tube 3 away from the sieve hole 23. The guide tube 3 and the rotating tube 31 are connected by a bearing 32. The inner ring of the bearing 32 is fixedly connected to the outer wall of the guide tube 3, and the outer ring of the bearing 32 is fixedly connected to the outer wall of the rotating tube 31. A curved tube 4 is connected to the bottom of the rotating tube 31. The curved tube 4 is horizontally arranged and has an S-shaped shape. The rotating tube 31 is connected to the middle of the curved tube 4. A liquid outlet 41 is connected to the bottom of the curved tube 4. There are three liquid outlets 41, two of which are located at both ends of the bottom of the curved tube 4, and one is located in the middle of the curved tube 4. Fan blades 42 are connected to both sides of the curved tube 4.

[0031] like Figure 3 As shown, six air outlets 52 are connected to the inner side of the annular pipe 51. The air outlets 52 are evenly distributed along the circumference of the curved pipe 4. The orientation of the air outlets 52 follows the movement trajectory of the fan blades 42, so that the air outlets 52 can blow the fan blades 42 when the air is expelled.

[0032] Operating Instructions: When carbon dioxide gas is introduced into the gas supply pipe 5 at a relatively slow speed, the carbon dioxide gas enters the tower body 1 through the annular pipe 51 and the gas outlet 52. The ammonia mother liquor passes through the cap 21, flows along the edge of the cap 21 to the sieve plate 22, then enters the sieve holes 23, flows along the sieve holes 23 into the guide pipe 3 and the rotating pipe 31, and finally flows into the curved pipe 4. The curved pipe 4 rotates due to the impact of the ammonia mother liquor, thus splashing the ammonia mother liquor out of the outlet 41, allowing the ammonia mother liquor to come into more thorough contact with the carbon dioxide gas. At the same time, the rotation of the curved pipe 4 drives the fan blades 42 to rotate, promoting the flow of carbon dioxide gas in the tower body 1, allowing the ammonia mother liquor to come into further thorough contact with the carbon dioxide gas.

[0033] When carbon dioxide gas is introduced into the gas supply pipe 5 at a relatively fast speed, the carbon dioxide gas ejected from the outlet 52 blows the fan blades 42, thereby driving the curved pipe 4 to rotate. When the ammonia mother liquor flows out from the outlet 41, it experiences a more intense evaporation effect, thus resulting in more thorough contact between the ammonia mother liquor and the carbon dioxide gas. Simultaneously with the faster introduction of carbon dioxide gas, the ammonia mother liquor also achieves more complete contact with the carbon dioxide gas.

Claims

1. A combined caustic soda carbonation tower for producing soda ash, comprising a tower body (1), a tray assembly (2) comprising a mushroom cap (21) and a sieve tray (22), characterized in that, The bottom of the sieve plate (22) is provided with sieve holes (23), and a flow guide pipe (3) is connected downward in the sieve holes (23). A rotating pipe (31) is coaxially arranged on the flow guide pipe (3), and the rotating pipe (31) is rotationally connected with the flow guide pipe (3). The bottom of the rotating pipe (31) is connected with a curved pipe (4), and the rotating pipe (31) is connected to the middle part of the curved pipe (4). The curved pipe (4) is provided with liquid outlets (41) at both ends. The curved pipe (4) is connected with a fan blade (42). The number of the fan blade (42) is two, and the fan blade (42) is located at both sides of the length direction of the curved pipe (4). The inner wall of the tower body (1) is provided with a gas conveying pipe (5) along the height direction, and the gas conveying pipe (5) conveys carbon dioxide gas between adjacent two tower plate assemblies (2). A circular annular pipe (51) is arranged between the adjacent two tower plate assemblies (2), and a plurality of gas outlets (52) are arranged on the inner side of the annular pipe (51) along the circumferential direction. The direction of the gas outlet (52) passes through the movement track of the fan blade (42).

2. A combined caustic soda carbonation tower according to claim 1, characterized in that, The number of the liquid outlet (41) is three, and the liquid outlet (41) is located at the bottom of the curved pipe (4). The three liquid outlets (41) are respectively located at both ends and the middle part of the curved pipe (4).

3. A combined caustic soda carbonation tower according to claim 1, characterized in that, A bearing (32) is connected between the flow guide pipe (3) and the rotating pipe (31). The inner ring of the bearing (32) is fixedly connected with the outer wall of the flow guide pipe (3), and the outer ring of the bearing (32) is fixedly connected with the inner wall of the rotating pipe (31).

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