Seven-effect integrated falling-film evaporator set for concentrating sodium aluminate solution

Abstract

The utility model discloses a seven-effect integrated falling-film evaporator set for concentrating sodium aluminate solution, which comprises seven falling-film evaporator units which are connected with one another, and a concentrated sodium aluminate solution preheating mechanism is connected to a feed port of the falling-film evaporator unit on the leftmost side; each falling film evaporator unit comprises an evaporator, a circulating pump arranged on the left side of the evaporator and a separator arranged on the right side of the circulating pump, and a liquid discharge port of the circulating pump is connected with a pipeline and a valve which are communicated with the top of the evaporator. According to the technical scheme, the preheating mechanism is arranged at the liquid inlet position of the integrated falling film evaporator set, so that the sodium aluminate solution needing to be evaporated and further concentrated by the falling film evaporator set reaches the temperature threshold value to be evaporated in advance, the vapor-liquid separation process of the sodium aluminate solution is accelerated, and the evaporation efficiency of the sodium aluminate solution is improved. And the working efficiency of the seven-effect falling film evaporator set is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of falling film evaporator equipment, in particular to a seven-effect integrated falling film evaporator group for concentrating sodium aluminate solution. Background Art

[0002] Falling film evaporation involves adding liquid from the upper tube box of the falling film evaporator's heating chamber. Liquid is evenly distributed to each heat exchange tube through a liquid distribution and film-forming device. Under the influence of gravity, vacuum induction, and airflow, the liquid flows from top to bottom in a uniform film. During this flow, it is heated and vaporized by the shell-side heating medium. The generated vapor and liquid enter the separation chamber of the evaporator together. After sufficient separation, the vapor enters the condenser for condensation (single-effect operation) or enters the next-effect evaporator as a heating medium, thus achieving multi-effect operation. The liquid is discharged from the separation chamber.

[0003] The energy-saving benefits of an evaporator are primarily reflected in the multiple utilization of steam. The greater the number of effects employed, the more frequently the steam is utilized, resulting in greater energy savings. When processing concentrated sodium aluminate solution, seven-effect evaporators are often used due to the high concentrations and large concentration differences between the incoming and outgoing materials. However, using a seven-effect evaporator requires increasing the steam temperature or significantly increasing the equipment footprint, which significantly increases the initial investment and is uneconomical. Therefore, those skilled in the art have proposed a seven-effect integrated falling-film evaporator system for concentrating sodium aluminate solution. Utility Model Content

[0004] The purpose of this utility model is to provide a technical solution for a seven-effect integrated falling film evaporator assembly for concentrating sodium aluminate solution to address the shortcomings of the background art. To address the drawbacks and defects of the background art, this technical solution has the following contents:

[0005] It comprises 7 interconnected falling film evaporator units, wherein the feed inlet of the falling film evaporator unit on the far left is connected to a concentrated sodium aluminate solution preheating mechanism;

[0006] The falling film evaporator unit includes an evaporator, a circulating pump arranged on the left side of the evaporator, and a separator arranged on the right side of the circulating pump. The discharge port of the circulating pump is connected to a pipeline and a valve that pass through the top of the evaporator. The discharge port of the evaporator is connected to the feed port of the separator through a pipeline. The discharge port of the separator is connected to the next evaporator through a pipeline.

[0007] The concentrated sodium aluminate solution preheating mechanism includes a tank body, a filter mesh plate fixed to the bottom area of ​​the tank body cavity, 12-15 electric heating rods are fixedly connected in a circular array on the top surface of the filter mesh plate, the bottom end surface of the tank body is connected to a connecting pipe, the end of the connecting pipe away from the tank body is connected to the filter mesh plate, and the discharge port of the filter mesh plate is connected to a feed pipe connected to the evaporator feed port.

[0008] As a preferred solution of the present invention: a liquid inlet control valve is provided at the connection position between the feed pipe and the evaporator.

[0009] As a preferred solution of the present invention: a liquid inlet port is provided on the top end surface of the tank body, and a plug is sealed inside the liquid inlet port.

[0010] As a preferred solution of the present invention: a liquid discharge port is provided on the bottom end surface of the tank body, and a joint connected to a connecting pipe is installed inside the liquid discharge port.

[0011] As a preferred solution of the present invention: the power receiving end of the electric heating rod is connected to a cable passing through the inside of the tank.

[0012] As a preferred solution of the present invention: 60-70 through holes arranged in a linear array are provided on the surface of the filter mesh plate.

[0013] As a preferred solution of the present invention: a solenoid valve is installed at the connection position between the connecting pipeline and the filter mesh plate.

[0014] As a preferred solution of the present invention: the liquid extraction port of the drainage pump is connected to the end of the connecting pipeline away from the tank body through a pipe joint, and the liquid discharge port of the drainage pump is connected to the end of the feed pipeline away from the evaporator through a pipe joint.

[0015] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0016] In the technical solution of the present utility model, a preheating mechanism is provided at the liquid inlet position of the integrated falling film evaporator group, so that the sodium aluminate solution that needs to be evaporated and further concentrated by the falling film evaporator group reaches the evaporation temperature threshold in advance, thereby accelerating the vapor-liquid separation process of the sodium aluminate solution and improving the working efficiency of the seven-effect falling film evaporator group. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the integrated falling film evaporator group;

[0019] Figure 2 It is a schematic diagram of a falling film evaporator unit;

[0020] Figure 3 Schematic diagram of the preheating mechanism for concentrated sodium aluminate solution.

[0021] Description of reference numerals:

[0022] 1. Falling film evaporator unit; 11. Evaporator; 12. Circulation pump; 13. Liquid inlet control valve; 14. Feed pipe; 15. Discharge pump; 16. Regulating valve pipe; 17. Separator; 2. Concentrated sodium aluminate solution preheating mechanism; 21. Tank; 22. Liquid inlet port; 23. Electric heating rod; 24. Connecting pipe; 25. Filter mesh plate; 26. Discharge port. DETAILED DESCRIPTION

[0023] In order to more clearly explain and illustrate the technical solution and implementation of the present invention, several preferred specific embodiments for implementing the technical solution of the present invention are introduced below.

[0024] The following description is merely exemplary in nature and is not intended to limit the present disclosure, its applications and uses. It should be understood that in all of these figures, the same or similar reference numerals indicate the same or similar parts and features. The various figures only schematically represent the concepts and principles of the embodiments of the present disclosure and do not necessarily show the specific dimensions and proportions of the various embodiments of the present disclosure. Specific parts in specific figures may use exaggerated methods to illustrate the relevant details or structures of the embodiments of the present disclosure. The various publications, patents and published patent specifications cited herein are incorporated herein by reference in their entirety. The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention.

[0025] Embodiment: A preferred technical solution for a seven-effect integrated falling film evaporator group for concentrating sodium aluminate solution.

[0026] It comprises 7 interconnected falling film evaporator units 1, wherein the feed inlet of the leftmost falling film evaporator unit 1 is connected to a concentrated sodium aluminate solution preheating mechanism 2;

[0027] The falling film evaporator unit 1 includes an evaporator 11, a circulating pump 12 arranged on the left side of the evaporator 11, and a separator 17 arranged on the right side of the circulating pump 12. The discharge port of the circulating pump 12 is connected to a pipeline and a valve that pass through the top of the evaporator 11. The discharge port of the evaporator 11 is connected to the feed port of the separator 17 through a pipeline. The discharge port of the separator 17 is connected to the next evaporator 11 through a pipeline.

[0028] The concentrated sodium aluminate solution preheating mechanism 2 includes a tank body 21, a filter mesh plate 25 fixed to the bottom area of ​​the inner cavity of the tank body 21, 12-15 electric heating rods 23 are fixedly connected in a circular array on the top surface of the filter mesh plate 25, the bottom end surface of the tank body 21 is connected to a connecting pipe 24, the end of the connecting pipe 24 away from the tank body 21 is connected to the filter mesh plate 25, and the discharge port of the filter mesh plate 25 is connected to the feed pipe 14 connected to the feed port of the evaporator 11.

[0029] A liquid inlet control valve 13 is installed at the connection between the feed pipe 14 and the evaporator 11. A liquid inlet port 22 is provided at the top end of the tank 21, which is sealed with a plug. A liquid drain port 26 is provided at the bottom end of the tank 21, which is internally fitted with a connector that connects to the connecting pipe 24. The power supply terminals of the electric heating rods 23 are connected to cables that extend from the interior of the tank 21.

[0030] The surface of the filter mesh plate 25 is provided with 60-70 through holes arranged in a linear array; a solenoid valve is installed at the connection position between the connecting pipe 24 and the filter mesh plate 25. The liquid extraction port of the liquid pump 15 is connected to the end of the connecting pipe 24 away from the tank 21 through a pipe joint, and the liquid discharge port of the liquid pump 15 is connected to the end of the feed pipe 14 away from the evaporator 11 through a pipe joint.

[0031] According to the above-mentioned preferred technical solution, the workflow of the technical solution is described as follows:

[0032] The sodium aluminate solution to be concentrated and subjected to gas-liquid separation is introduced into the tank body 21 from the liquid inlet port 22. With the help of multiple sets of electric heating rods 23 and temperature sensors inside the tank body 21, while the electric heating rods 23 heat the sodium aluminate solution, the temperature sensor detects the temperature of the solution inside the tank body 21. After the sodium aluminate solution reaches a specified temperature threshold, the sodium aluminate solution is allowed to flow into the connecting pipe 24 along the filter holes inside the filter mesh plate 25 through the solenoid valve on the connecting pipe 24. The sodium aluminate solution is then pumped into the feed pipe 14 by the drainage pump 15 and transported to the inside of the evaporator 11 for evaporation.

[0033] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A seven-effect integrated falling film evaporator group for concentrating sodium aluminate solution, comprising seven interconnected falling film evaporator units (1), characterized in that: The feed inlet of the falling film evaporator unit (1) on the far left is connected to a concentrated sodium aluminate solution preheating mechanism (2); The falling film evaporator unit (1) includes an evaporator (11), a circulation pump (12) arranged on the left side of the evaporator (11), and a separator (17) arranged on the right side of the circulation pump (12); the discharge port of the circulation pump (12) is connected to a pipeline and a valve that pass through the top of the evaporator (11); the discharge port of the evaporator (11) is connected to the feed port of the separator (17) through a pipeline; and the discharge port of the separator (17) is connected to the next evaporator (11) through a pipeline; The concentrated sodium aluminate solution preheating mechanism (2) comprises a tank body (21), a filter mesh plate (25) fixed to the bottom area of ​​the inner cavity of the tank body (21), 12-15 electric heating rods (23) are fixedly connected in a ring array on the top surface of the filter mesh plate (25), a connecting pipe (24) is connected to the bottom end surface of the tank body (21), the end of the connecting pipe (24) away from the tank body (21) is connected to the filter mesh plate (25), and the discharge port of the filter mesh plate (25) is connected to the feed pipe (14) connected to the feed port of the evaporator (11).

2. The seven-effect integrated falling film evaporator group for concentrating sodium aluminate solution according to claim 1, characterized in that: A liquid inlet control valve (13) is provided at the connection position between the feed pipe (14) and the evaporator (11).

3. The seven-effect integrated falling film evaporator group for concentrating sodium aluminate solution according to claim 1, characterized in that: The top end surface of the tank body (21) is provided with a liquid inlet port (22), and the inside of the liquid inlet port (22) is sealed with a plug.

4. The seven-effect integrated falling film evaporator assembly for concentrating sodium aluminate solution according to claim 1, characterized in that: The bottom end surface of the tank body (21) is provided with a liquid discharge port (26), and a joint connected to the connecting pipe (24) is installed inside the liquid discharge port (26).

5. The seven-effect integrated falling film evaporator assembly for concentrating sodium aluminate solution according to claim 1, characterized in that: The power receiving ends of the electric heating rods (23) are connected to cables passing through the interior of the tank (21).

6. The seven-effect integrated falling film evaporator assembly for concentrating sodium aluminate solution according to claim 1, characterized in that: 60-70 through holes arranged in a linear array are provided on the surface of the filter mesh plate (25).

7. The seven-effect integrated falling film evaporator assembly for concentrating sodium aluminate solution according to claim 1, characterized in that: A solenoid valve is installed at the connection position between the connecting pipeline (24) and the filter mesh plate (25).

8. The seven-effect integrated falling film evaporator assembly for concentrating sodium aluminate solution according to claim 1, characterized in that: The liquid extraction port of the liquid discharge pump (15) is connected to the end of the connecting pipe (24) away from the tank body (21) through a pipe joint, and the liquid discharge port of the liquid discharge pump (15) is connected to the end of the feed pipe (14) away from the evaporator (11) through a pipe joint.

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