Recycling device utilizing rectification waste liquid

Abstract

The utility model relates to the field of waste liquid recycling devices, and discloses a rectification waste liquid recycling device which comprises a heat exchanger, the left side of the heat exchanger is fixedly connected with a waste liquid pipe, the right side of the heat exchanger is connected with a stripping tower through a pipeline, and the right side of the stripping tower is fixedly connected with an air inlet pipe. The rear side of the stripping tower is connected with a separator through a pipeline, the back surface of the separator is connected with a reformer through a pipeline, the back surface of the heat exchanger is connected with a cooler through a pipeline, and the cooler is respectively connected with a rectification system, a synthetic alcohol washing tower, a circulating water system and a flash steam recovery tower through pipelines. According to the utility model, the heat exchanger, the waste liquid pipe, the stripping tower, the gas inlet pipe, the separator, the cooler, the rectification system, the synthetic alcohol washing tower, the circulating water system, the flash steam recovery tower and the conversion furnace are matched, so that waste liquid generated in rectification production can be recycled, the utilization efficiency of the waste liquid is improved, and the waste liquid does not need to be sent out for biochemical treatment.

Description

Technical Field

[0001] This utility model relates to the field of waste liquid recycling devices, and in particular to a device for recycling distillation waste liquid. Background Technology

[0002] Distillation is a chemical process that utilizes the different volatility of components in a liquid mixture to separate light and heavy components through multiple partial vaporizations and condensations. By precisely controlling parameters such as temperature, pressure, and reflux ratio, high-purity products can be produced. It is the most widely used liquid mixture separation operation in industry and is widely used in petroleum, chemical, light industry, food, metallurgy and other sectors.

[0003] In existing distillation processes, the waste liquid generated is directly transported to a biochemical treatment facility for processing. However, this waste liquid not only contains recyclable components but also contains a large amount of water. Directly transporting it for sublimation treatment not only wastes water resources but also increases the cost of biochemical treatment and leads to resource waste. Therefore, a distillation waste liquid recycling device is proposed to solve the above problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a device for recycling distillation waste liquid, which aims to improve the problem that the existing technology requires sending waste liquid to biochemical treatment during the distillation production process, resulting in wasted resources and increased biochemical treatment costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a device for recycling distillation waste liquid, comprising a heat exchanger, a waste liquid pipe fixedly connected to the left side of the heat exchanger, a stripping tower connected to the right side of the heat exchanger, an inlet pipe fixedly connected to the right side of the stripping tower, a separator connected to the rear side of the stripping tower, a converter connected to the back side of the separator, a cooler connected to the back side of the heat exchanger, and the cooler being connected to a distillation system, a synthesis washing tower, a circulating water system, and a flash vapor recovery tower via pipes.

[0006] As a further description of the above technical solution:

[0007] The front side of the stripping tower is connected to the front side of the heat exchanger via a pipe, and the separator is connected to the heat exchanger via a pipe.

[0008] As a further description of the above technical solution:

[0009] An air inlet is fixedly connected to the lower side of the left side surface of the separator, and an air outlet is fixedly connected to the upper side of the left side surface of the separator. A coarse-pore separation disc is fixedly connected to the lower side of the interior of the separator, and a fine-pore separation disc is fixedly connected to the upper side of the interior of the separator. A conical liquid collection shell is fixedly connected to the top of the separator. A drain pipe is provided above the fine-pore separation disc. A cooling unit is provided above the conical liquid collection shell, and the cooling unit is used to regulate the temperature of the conical liquid collection shell. A drain pipe is fixedly connected to the bottom of the separator.

[0010] As a further description of the above technical solution:

[0011] The upper part of the conical liquid collecting shell is hollow, and the conical liquid collecting shell as a whole is conical in shape, with the tip of the conical liquid collecting shell facing downward.

[0012] As a further description of the above technical solution:

[0013] The bottom end of the drain pipe passes through the coarse-pore separation plate and the fine-pore separation plate, and the drain pipe is fixedly connected to the coarse-pore separation plate and the fine-pore separation plate.

[0014] As a further description of the above technical solution:

[0015] A liquid collecting hopper is fixedly connected to the top of the drain pipe, and a hydrophobic membrane is fixedly connected to the inner wall surface of both the drain pipe and the liquid collecting hopper.

[0016] As a further description of the above technical solution:

[0017] The cooling unit includes a cooler, the bottom output end of which passes through the separator and is fixedly connected to the inner bottom surface of the conical liquid collection shell. A side heat-conducting rod is fixedly connected to the outer surface of the bottom output end of the cooler.

[0018] As a further description of the above technical solution:

[0019] The end of the side heat-conducting rod away from the bottom output end of the cooler is fixedly connected to the inner wall of the conical liquid collecting shell.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, by coordinating the heat exchanger, waste liquid pipe, stripping tower, air inlet pipe, separator, cooler, distillation system, synthetic alcohol washing tower, circulating water system, flash vapor recovery tower and conversion furnace, the waste liquid generated in the distillation production can be recycled, improving the utilization efficiency of waste liquid, eliminating the need to send waste liquid to biochemical treatment, saving water resources and reducing biochemical treatment costs.

[0022] 2. In this utility model, by combining the coarse-pore separation plate, fine-pore separation plate, conical liquid collection shell, drain pipe and cooling unit, the gas entering the separator can be filtered in multiple layers to make the gas-liquid separation more thorough. After filtration, the residual liquid droplets in the upward floating gas are quickly collected, and the phenomenon of liquid flooding or tower rushing is avoided, which would disrupt the normal gas-liquid distribution and mass and heat transfer process in the separator and affect the separation effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall device for recycling distillation waste liquid according to the present invention.

[0024] Figure 2 This is a schematic diagram of a separator for a distillation waste liquid recycling device proposed in this utility model;

[0025] Figure 3 This is a schematic cross-sectional view of the separator of a distillation waste liquid recycling device proposed in this utility model;

[0026] Figure 4 This is a schematic diagram of a conical liquid collection shell and a cooling unit for a distillation waste liquid recycling device proposed in this utility model.

[0027] Legend:

[0028] 1. Heat exchanger; 2. Waste liquid pipe; 3. Stripping tower; 4. Gas inlet pipe; 5. Separator; 6. Cooler; 7. Distillation system; 8. Synthesis washing tower; 9. Circulating water system; 10. Flash vapor recovery tower; 11. Converter; 12. Gas inlet; 13. Gas outlet; 14. Coarse-pore separation plate; 15. Fine-pore separation plate; 16. Conical liquid collection shell; 17. Drain pipe; 18. Refrigerator; 19. Side heat guide rod; 20. Liquid collection hopper. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figure 1This utility model provides an embodiment of a distillation waste liquid recycling device, including a heat exchanger 1. A waste liquid pipe 2 is fixedly connected to the left side of the heat exchanger 1, and a stripping tower 3 is connected to the right side of the heat exchanger 1. The front side of the stripping tower 3 is connected to the front side of the heat exchanger 1 through a pipe. The liquid separated inside the stripping tower 3 will return to the heat exchanger 1 for reuse, thereby improving the heat recovery efficiency. An air inlet pipe 4 is fixedly connected to the right side of the stripping tower 3, and a separator 5 is connected to the rear side of the stripping tower 3 through a pipe. The separator 5 is connected to the heat exchanger 1 through a pipe, so that the separator 5 and the heat exchanger 1 form a circulation pipeline, allowing the water separated inside the separator 5 to enter the heat exchanger 1 for reuse. A converter 11 is connected to the back side of the separator 5 through a pipe, and a cooler 6 is connected to the back side of the heat exchanger 1 through a pipe. The cooler 6 is connected to a distillation system 7, a synthesis washing tower 8, a circulating water system 9, and a flash vapor recovery tower 10 through pipes.

[0031] Reference Figures 2-3 A drain pipe is fixedly connected to the bottom of the separator 5. An air inlet 12 is fixedly connected to the lower side of the left side surface of the separator 5. The gas stripped from the stripping tower 3 will enter the interior of the separator 5 through the air inlet 12 via the pipe for gas-liquid separation. An air outlet 13 is fixedly connected to the upper side of the left side surface of the separator 5. A coarse-pore separation plate 14 is fixedly connected to the lower side of the interior of the separator 5. A fine-pore separation plate 15 is fixedly connected to the upper side of the interior of the separator 5. The air inlet 12 is located below the coarse-pore separation plate 14. After the gas enters the interior of the separator 5, it will pass through the coarse-pore separation plate 14 and the fine-pore separation plate 15 in sequence for multi-layer fine filtration of gas and liquid, so that the gas and liquid are separated more thoroughly during the separation process, and the gas-liquid separation is maximized.

[0032] A conical liquid collecting shell 16 is fixedly connected to the top of the separator 5. The upper part of the conical liquid collecting shell 16 is hollow, and the conical liquid collecting shell 16 is generally conical in shape with the tip of the conical liquid collecting shell 16 facing downward. The filtered gas will continue to float upward and reach the top of the separator 5. The residual liquid droplets in the airflow will gather on the bottom surface of the conical liquid collecting shell 16. After forming water droplets, they will slide down the bottom inclined surface of the conical liquid collecting shell 16 to the bottom tip. A drain pipe 17 is provided above the fine pore separation plate 15. The bottom end of the drain pipe 17 passes through the coarse pore separation plate 14 and the fine pore separation plate 15. The drain pipe 17 is fixedly connected to the coarse pore separation plate 14 and the fine pore separation plate 15.

[0033] Water droplets dripping from the bottom tip of the conical liquid collecting shell 16 enter the drain pipe 17 and drip downwards to the drain pipe for discharge. During this process, the drain pipe 17 separates the upward-floating gas from the dripping water droplets, preventing flooding or tower overflow, which would disrupt the normal gas-liquid distribution and mass and heat transfer process within the separator 5 and affect the separation effect. A liquid collecting hopper 20 is fixedly connected to the top of the drain pipe 17. Hydrophobic membranes are fixedly connected to the inner surfaces of both the drain pipe 17 and the liquid collecting hopper 20. The liquid collecting hopper 20 increases the water inlet area at the top of the drain pipe 17, allowing water droplets dripping from the bottom of the conical liquid collecting shell 16 to enter the drain pipe 17 more effectively. At the same time, after entering the drain pipe 17, the water droplets fall quickly under the action of the hydrophobic membrane, preventing them from adhering to the inner wall of the drain pipe 17 and affecting the drainage effect.

[0034] Reference Figures 3-4 A cooling unit is provided above the conical liquid collecting shell 16. The cooling unit includes a cooler 18. The bottom output end of the cooler 18 passes through the separator 5. The bottom output end of the cooler 18 is fixedly connected to the inner bottom surface of the conical liquid collecting shell 16. A side heat-conducting rod 19 is fixedly connected to the outer surface of the bottom output end of the cooler 18. One end of the side heat-conducting rod 19 away from the bottom output end of the cooler 18 is fixedly connected to the inner wall of the conical liquid collecting shell 16. When the cooler 18 is started, it can cool the conical liquid collecting shell 16, so that the liquid in the gas can be separated more quickly. At the same time, the cooling efficiency of the cooler 18 can be adjusted according to the boiling point of the gas. The side heat-conducting rod 19 can increase the contact area between itself and the inner wall of the conical liquid collecting shell 16, further improving the temperature regulation efficiency.

[0035] Working principle: Waste liquid enters heat exchanger 1 through waste liquid pipe 2 and is preheated. Then, it enters stripping tower 3 through a pipeline. At this time, steam enters stripping tower 3 through inlet pipe 4 to strip the waste liquid, removing other components. The stripped waste liquid is then sent to separator 5 for gas-liquid separation. The gas is then sent to converter 11 for combustion reaction. The qualified water after stripping and the water separated in separator 5 will flow back to heat exchanger 1 through a pipeline to preheat the waste liquid, improving heat recovery efficiency. After passing through heat exchanger 1, the water will enter cooler 6 for cooling. After cooling, part of it enters distillation system 7 to replace the extractant in pre-tower reflux tank, part enters synthesis washing alcohol tower 8 to replace demineralized water, and part enters flash steam recovery tower 10 to replace demineralized water. The remaining amount is sent to circulating water system 9, achieving the purpose of cost saving.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for recovering and utilizing distillation waste liquid, characterized in that: The system includes a heat exchanger (1), a waste liquid pipe (2) fixedly connected to the left side of the heat exchanger (1), a stripping tower (3) connected to the right side of the heat exchanger (1), an air inlet pipe (4) fixedly connected to the right side of the stripping tower (3), a separator (5) connected to the rear side of the stripping tower (3), a converter (11) connected to the back side of the separator (5), a cooler (6) connected to the back side of the heat exchanger (1), and the cooler (6) connected to a distillation system (7), a synthesis washing alcohol tower (8), a circulating water system (9), and a flash vapor recovery tower (10) via pipes.

2. The device for recycling distillation waste liquid according to claim 1, characterized in that: The front side of the stripping tower (3) is connected to the front side of the heat exchanger (1) by a pipe, and the separator (5) is connected to the heat exchanger (1) by a pipe.

3. The device for recycling distillation waste liquid according to claim 1, characterized in that: An air inlet (12) is fixedly connected to the lower side of the left side surface of the separator (5), an air outlet (13) is fixedly connected to the upper side of the left side surface of the separator (5), a coarse-hole separation plate (14) is fixedly connected to the lower side of the interior of the separator (5), a fine-hole separation plate (15) is fixedly connected to the upper side of the interior of the separator (5), a conical liquid collection shell (16) is fixedly connected to the top of the separator (5), a drain pipe (17) is provided above the fine-hole separation plate (15), a cooling unit is provided above the conical liquid collection shell (16), the cooling unit is used to regulate the temperature of the conical liquid collection shell (16), and a drain pipe is fixedly connected to the bottom of the separator (5).

4. The device for recycling distillation waste liquid according to claim 3, characterized in that: The upper part of the conical liquid collecting shell (16) is hollow, and the conical liquid collecting shell (16) is generally conical in shape, with the tip of the conical liquid collecting shell (16) facing downward.

5. The device for recycling distillation waste liquid according to claim 3, characterized in that: The bottom end of the drain pipe (17) passes through the coarse pore separation plate (14) and the fine pore separation plate (15), and the drain pipe (17) is fixedly connected to the coarse pore separation plate (14) and the fine pore separation plate (15).

6. The device for recycling distillation waste liquid according to claim 3, characterized in that: The top end of the drain pipe (17) is fixedly connected to a liquid collecting hopper (20), and the inner wall surfaces of both the drain pipe (17) and the liquid collecting hopper (20) are fixedly connected to a hydrophobic membrane.

7. The device for recycling distillation waste liquid according to claim 3, characterized in that: The cooling unit includes a cooler (18), the bottom output end of which passes through the separator (5), the bottom output end of which is fixedly connected to the inner bottom surface of the conical liquid collection shell (16), and a side heat-conducting rod (19) is fixedly connected to the outer surface of the bottom output end of the cooler (18).

8. The device for recycling distillation waste liquid according to claim 7, characterized in that: The end of the side heat-conducting rod (19) away from the bottom output end of the cooler (18) is fixedly connected to the inner wall of the conical liquid collection shell (16).

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