Distillation tower for alkali production

Abstract

The utility model discloses a distillation tower for making alkali, which comprises a tower body, a partition plate is arranged in the middle of the tower body and divides the tower body into an upper part and a lower part, the upper part is a preheating section, the lower part is a distillation section, a plurality of layers of first sieve plates are arranged in the preheating section, and a plurality of layers of second sieve plates are arranged in the distillation section. The tower body is of an integrated structure, and a gas-liquid separator is arranged at the top of the tower body; a lower steam inlet pipe is horizontally arranged in the lower end of the tower body, one port of the lower steam inlet pipe is closed, the other port of the lower steam inlet pipe penetrates through the side wall of the tower body and extends to the outer side of the tower body, and a steam outlet is formed in the bottom wall of the lower steam inlet pipe. The utility model has the characteristics of high strength, high toughness, high temperature resistance, corrosion resistance, high efficiency and the like.

Description

Technical Field

[0001] The utility model relates to the field of alkali production, and more specifically to a distillation tower for alkali production. Background Art

[0002] The distillation tower is one of the important equipment in the ammonia-soda process. Its function is to recover ammonia and carbon dioxide from the filtered mother liquor and supply it to the ammonia absorption section. Traditional ammonia distillation towers all use a layered assembly structure of cast iron tower rings, which is cumbersome to install, expensive, and not conducive to environmental protection and energy saving. Traditional cast iron towers are heavy and have large wind loads, resulting in large investments in equipment foundations and frames. The steam inlet is not resistant to erosion and needs to be replaced in time. The sieve plates and partitions in the tower are generally connected to the tower body in a clamping type, which requires sealing gaskets, is expensive, and is prone to leakage. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a distillation tower for alkali production, which can reduce the construction cost, improve the efficiency of ammonia distillation, increase versatility, reduce maintenance costs, solve the problem of long-term use, save energy and protect the environment, and other effects.

[0004] The purpose of the utility model is achieved through the following technical solutions.

[0005] The utility model discloses a distillation tower for alkali production, comprising a tower body, wherein a partition is arranged in the middle of the tower body, dividing the tower body into an upper and a lower part, wherein the upper part is a preheating section, and the lower part is a distillation section, wherein a plurality of layers of first sieve plates are arranged in the preheating section, and a plurality of layers of second sieve plates are arranged in the distillation section, wherein the tower body is arranged as an integrated structure, and a gas-liquid separator is arranged on the top; wherein a lower steam inlet pipe is horizontally arranged inside the lower end of the tower body, wherein one end of the lower steam inlet pipe is closed, and the other end thereof extends through the side wall of the tower body to the outside of the tower body, and a steam outlet is opened on the bottom wall of the lower steam inlet pipe.

[0006] Furthermore, the tower body adopts a composite plate tower with an integrated structure; the first sieve plate is provided with 11 layers and is made of titanium; the second sieve plate is provided with 17 layers and is made of stainless steel.

[0007] Furthermore, a first support ring is provided between each layer of the first sieve plate and the tower body, the first support ring is welded to the inner wall of the tower body, and the first support ring is fixed to the first sieve plate by bolts.

[0008] Furthermore, the partition is welded to the inner wall of the tower body.

[0009] Furthermore, a second support ring is provided between each layer of the second sieve plate and the tower body, the second support ring is welded to the inner wall of the tower body, and the second support ring is fixed to the second sieve plate by bolts.

[0010] Compared with the prior art, the beneficial effects brought about by the technical solution of the utility model are:

[0011] (1) The utility model adopts an integral structure, and the overall manufacturing and installation do not require layered assembly. The tower body adopts a composite plate tower with an integral structure, the first sieve plate adopts a titanium sieve plate, and the second sieve plate adopts a stainless steel sieve plate, thereby greatly reducing the dead weight and reducing the manufacturing cost; in addition, the tower body weight is greatly reduced, which can greatly reduce the investment cost. The use of a steel structure can reduce environmental pollution during the equipment manufacturing stage and improve the working environment of manufacturing workers. The durability of the equipment is increased, the maintenance cycle is greatly extended, and the tower body life is increased to more than 20 years.

[0012] (2) In the utility model, the upper and lower sections of the tower body are respectively provided with 11 layers of titanium sieve plates and 17 layers of stainless steel sieve plates with a spacing of 925 mm, which ensures that the ammonia evaporation capacity of the tower is not less than 180m3 / h, the daily output is not less than 900 tons, and the consumption is lower.

[0013] (3) In the utility model, support rings are arranged between the first sieve plate, the second sieve plate and the tower body. The support rings are directly welded to the tower body, and the support rings are connected to the first sieve plate and the second sieve plate by bolts. This design can reduce the weight of the entire tower and has low cost.

[0014] (4) A lower steam inlet pipe is provided at the bottom of the tower in the utility model. One end of the lower steam inlet pipe is closed and the other end is used as a steam inlet. A steam outlet is provided on the bottom wall to ensure that the gas entering the equipment does not cause erosion to the equipment body, thereby ensuring the steam flow rate and durability, protecting the equipment and increasing efficiency.

[0015] (5) The utility model installs a gas-liquid separator at the upper part of the tower body, which better solves the problem of gas carrying liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of a distillation tower for alkali production.

[0017] Figure 2 It is a partially enlarged schematic diagram of the upper part of the distillation tower used for alkali production of the utility model.

[0018] Figure 3 It is an enlarged schematic diagram of the lower part of the distillation tower used for alkali production of the utility model.

[0019] Figure 4 It is an enlarged schematic diagram of the steam inlet pipe in the lower middle part of the utility model.

[0020] Figure 5 It is an enlarged schematic diagram of the first sieve plate in the utility model.

[0021] Figure numerals: 1-gas-liquid separator; 2-first sieve plate; 3-partition plate; 4-second sieve plate; 5-lower steam inlet pipe, 6-mother liquor inlet pipe; 7-upper steam inlet pipe; 8-blending liquid inlet pipe. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Example 1

[0024] like Figures 1 to 3 As shown, the utility model relates to a distillation tower used for distilling ammonia from mother liquor in the soda ash production industry. This embodiment proposes a distillation tower for alkali production, including a tower body, wherein the tower body is provided with a gas-liquid separator 1, a first sieve plate 2, a partition plate 3, a second sieve plate 4, a lower steam inlet pipe 5, etc.

[0025] The tower body is arranged as an integrated structure, and the gas-liquid separator 1 is arranged at the top of the tower body to separate the liquid entrained in the ammonia gas and ensure that the high-purity ammonia gas is discharged from the top gas outlet.

[0026] The partition 3 is arranged in the middle of the tower body, dividing the tower body into two parts, the upper part is the preheating section, and the lower part is the distillation section, and the distillation of the two parts does not affect each other. The preheating section is provided with several layers of first sieve plates 2, and the distillation section is provided with several layers of second sieve plates 4.

[0027] The side wall of the tower body is also provided with a mother liquid inlet pipe 6, an upper steam inlet pipe 7, a blending liquid inlet pipe 8, and a lower steam inlet pipe 5 from top to bottom. In the longitudinal direction, the mother liquid inlet pipe 6 is located between the gas-liquid separator 1 and the uppermost first sieve plate 2, the upper steam inlet pipe 7 is located between the lowermost first sieve plate 2 and the partition plate 3, and the blending liquid inlet pipe 8 is located between the partition plate 3 and the uppermost second sieve plate 4. The lower steam inlet pipe 5 is horizontally arranged inside the lower end of the tower body, and is located at the lower end of the lowermost second sieve plate 4, as shown in FIG. Figure 4 As shown, one end of the lower steam inlet pipe 5 is closed by a baffle to prevent steam from scouring the tower body, and the other end is used as a steam inlet, extending through the side wall of the tower body to the outside of the tower body. A steam outlet is provided on the bottom wall of the lower steam inlet pipe 5 to ensure steam flow and durability.

[0028] Example 2

[0029] This embodiment is proposed on the basis of Embodiment 1. In this embodiment, the tower body can be made of a composite plate with an integrated structure, and the partition plate 3 is welded to the inner wall of the tower body 1 .

[0030] In this embodiment, the first sieve plate 2 is made of titanium. A first support ring is arranged between each layer of the first sieve plate 2 and the tower body, the first support ring is welded to the inner wall of the tower body, and the first support ring and the first sieve plate 2 are fixed by bolts.

[0031] In this embodiment, the second sieve plate 4 is a stainless steel sieve plate. A second support ring is arranged between each layer of the second sieve plate 4 and the tower body, the second support ring is welded to the inner wall of the tower body, and the second support ring and the second sieve plate 4 are fixed by bolts.

[0032] Example 3

[0033] This embodiment is proposed on the basis of embodiment 2. In this embodiment, the total height of the tower body 1 is 46 meters, the inner diameter is 3 meters, and the tower wall thickness is 14 mm. The gas-liquid separator 1 is arranged 1.5 meters from the top of the tower body. The lower steam inlet pipe 5 is a stainless steel pipe.

[0034] In this embodiment, Figure 5 As shown, each layer of the first sieve plate 2 has 252 holes with a diameter of 100 mm, and 11 layers are arranged at equal intervals. The distance between two adjacent layers of the first sieve plates 2 is 925 mm, which can improve the ammonia evaporation efficiency of the tower, thereby increasing the output and increasing the economic benefits.

[0035] In this embodiment, each layer of the second sieve plate 4 is composed of 188 circular holes with a diameter of 120 mm, and 17 layers are arranged at equal intervals. The distance between two adjacent layers of the second sieve plates 4 is 925 mm, which can ensure the effect of ash distillation.

[0036] Although the functions and working processes of the utility model are described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific functions and working processes, and the above-mentioned specific implementation methods are merely illustrative rather than restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the utility model and the claims, which are all within the protection of the utility model.

Claims

1. A distillation tower for alkali production, comprising a tower body, wherein a partition plate (3) is arranged in the middle of the tower body, dividing the tower body into an upper and lower part, the upper part is a preheating section, and the lower part is a distillation section, wherein a plurality of layers of first sieve plates (2) are arranged in the preheating section, and a plurality of layers of second sieve plates (4) are arranged in the distillation section, characterized in that: The tower body is arranged as an integrated structure, and a gas-liquid separator (1) is arranged on the top; a lower steam inlet pipe (5) is arranged horizontally inside the lower end of the tower body, one end of the lower steam inlet pipe (5) is closed, and the other end passes through the side wall of the tower body and extends to the outside of the tower body, and a steam outlet is opened on the bottom wall of the lower steam inlet pipe (5).

2. The distillation tower for alkali production according to claim 1, characterized in that: The tower body is made of a composite plate tower with an integrated structure; the first sieve plates (2) are arranged in 11 layers and are made of titanium; the second sieve plates (4) are arranged in 17 layers and are made of stainless steel.

3. The distillation tower for alkali production according to claim 1, characterized in that: A first support ring is provided between each layer of the first sieve plate (2) and the tower body, the first support ring is welded to the inner wall of the tower body, and the first support ring and the first sieve plate (2) are fixed by bolts.

4. The distillation tower for alkali production according to claim 1, characterized in that: The partition plate (3) is welded to the inner wall of the tower body.

5. The distillation tower for alkali production according to claim 1, characterized in that: A second support ring is provided between each layer of the second sieve plate (4) and the tower body, the second support ring is welded to the inner wall of the tower body, and the second support ring is fixed to the second sieve plate (4) by bolts.

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