A waste liquid distillation system

Abstract

The utility model discloses a waste liquid distillation system, including a conveying main line, a distillation tower and a connecting pipeline, wherein the distillation tower is connected to the conveying main line, the distillation tower is used for distillation treatment of DMF waste liquid, one side of the distillation tower is connected to a reboiler through a connecting pipeline, one side of the distillation tower is provided with a reflux component connected to a DMF waste liquid deacidification device, the reflux pipeline is connected between the distillation tower and the DMF waste liquid deacidification device, a reflux pump is provided on the reflux pipeline, a conveying component is provided on the reflux pipeline, and the conveying component is provided between the reflux pump and the distillation tower. The utility model utilizes the coordinated use of the conveying main line, the distillation tower and the reflux component, the reflux component includes a reflux pump, a reflux pipeline and a conveying component, the reflux component can convey the DMF waste liquid conveyed by the distillation tower to the desulfurization tower for internal treatment to the distillation tower again for distillation treatment, and under the action of the conveying component, the situation of suspension of DMF waste liquid conveyance due to pipeline blockage can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of distillation systems, in particular to a waste liquid distillation system. Background Art

[0002] In the manufacturing process of microfiber leather, DMF is used as a solvent to dissolve polyurethane resin. In this process, DMF is washed out by utilizing its water-soluble property, resulting in DMF wastewater in the manufacturing process of microfiber leather. With the expansion of enterprise scale and the enhancement of human awareness of environmental protection, coupled with the requirements for synthetic leather production costs and the continuous development of DMF recovery technology, it is necessary to recover DMF from DMF wastewater for reuse.

[0003] The DMF recovery device can be generally divided into three-stage vacuum concentration, feed evaporation, slag removal, vacuum distillation, vacuum deacidification, formic acid neutralization, and top water deamination steps. When the DMF waste liquid is distilled, a distillation tower is usually used to directly distill the DMF waste liquid. When the distillation tower is used to treat the DMF waste liquid, the DMF waste liquid is usually directly transported to the liquid inlet end of the distillation tower through a conveying pipeline. After the DMF waste liquid passes through the distillation tower, it is discharged from the liquid outlet end of the distillation tower into the deacidification equipment. However, this method may result in incomplete distillation of the DMF waste liquid, and it is not convenient to reflux the distilled and deacidified DMF waste liquid into the distillation tower for distillation treatment. Utility Model Content

[0004] The purpose of the utility model is to provide a waste liquid distillation system to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical solutions: a waste liquid distillation system, comprising a main conveying line, a distillation tower and a connecting pipeline, wherein the distillation tower is connected to the main conveying line, and the distillation tower is used for distillation treatment of DMF waste liquid;

[0006] One side of the distillation tower is connected to a reboiler through a connecting pipeline, and one side of the distillation tower is provided with a reflux component connected to the DMF waste liquid deacidification equipment, and the reflux component includes:

[0007] A reflux pipeline connected between the distillation tower and the DMF waste liquid deacidification device;

[0008] A reflux pump, wherein the reflux pump is arranged on the reflux pipeline;

[0009] The conveying component is arranged on the reflux pipeline, and the conveying component is arranged between the reflux pump and the distillation tower.

[0010] Preferably, a drain pipe connected to the DMF waste liquid deacidification equipment is provided on one side of the distillation tower, the air inlet end of the reboiler is connected to the external steam pipe, and the end of the reboiler is connected to a valve.

[0011] Preferably, the conveying assembly comprises:

[0012] A first branch pipe and a second branch pipe, wherein one end of the first branch pipe and the second branch pipe is connected to a liquid outlet of a reflux pump, and the other end of the first branch pipe and the second branch pipe is connected to a reflux pipeline;

[0013] A connecting pipe is fixedly connected between the first branch pipe and the second branch pipe.

[0014] Preferably, filters are fixedly mounted on both the first branch pipe and the second branch pipe, the filters are located on the side of the connecting pipe away from the reflux pump, and solenoid valves are fixedly mounted on both the first branch pipe and the second branch pipe.

[0015] Preferably, a first check valve is fixedly installed on the first branch pipe and the second branch pipe, the first check valve is located between the solenoid valve and the connecting pipe, and a control valve is fixedly installed and connected on the first branch pipe and the second branch pipe.

[0016] Preferably, the second check valve is fixedly installed on the first branch pipe and the second branch pipe, the control valve is located between the connecting pipe and the filter, and the filter is located between the second check valve and the control valve.

[0017] Preferably, a flow meter and a pressure gauge are connected to the reflux pipeline, and the flow meter and the pressure gauge are located between the conveying component and the reflux pump. The flow meter and the pressure gauge are used to detect the flow rate and pressure of the DMF waste liquid conveyed by the conveying component.

[0018] Technical effects and advantages of the utility model:

[0019] The utility model utilizes the coordinated use of a conveying main line, a distillation tower and a reflux component. The reflux component includes a reflux pump, a reflux pipeline and a conveying component. The reflux component can convey the DMF waste liquid conveyed from the distillation tower to the desulfurization tower for internal treatment to the distillation tower again for distillation treatment. Under the action of the conveying component, the situation of suspension of DMF waste liquid conveyance due to pipeline blockage can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the overall block diagram of the utility model.

[0021] Figure 2 This is a block diagram of the reflux component of the utility model.

[0022] In the figure: 1. main conveying line; 2. distillation tower; 3. reflux assembly; 31. reflux pump; 32. reflux pipeline; 33. conveying assembly; 331. first branch pipe; 332. second branch pipe; 333. filter; 334. connecting pipe; 335. solenoid valve; 336. first check valve; 337. control valve; 338. second check valve; 34. flow meter; 35. pressure gauge; 4. reboiler; 5. drain pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The utility model provides Figure 1-2 A waste liquid distillation system shown includes a conveying main line 1, a distillation tower 2 and a connecting pipeline. The distillation tower 2 is connected to the conveying main line 1. The distillation tower 2 is used for distillation treatment of DMF waste liquid. A discharge pipe 5 connected to a DMF waste liquid deacidification device is provided on one side of the distillation tower 2. The DMF waste liquid deacidification device is a desulfurization tower. After the distillation tower 2 distills the DMF waste liquid, it can be transported to the inside of the desulfurization tower through the discharge pipe 5 for desulfurization treatment. After the DMF waste liquid is treated by the desulfurization tower, it can also return to the inside of the distillation tower 2 for distillation treatment again through the reflux component 3. The air inlet end of the reboiler 4 is connected to the external steam pipe. The end of the reboiler 4 is connected to a valve. The reboiler 4 cooperates with the distillation tower 2. The DMF waste liquid can be distilled. A reboiler 4 is connected to one side of the distillation tower 2 through a connecting pipeline. A reflux component 3 connected to the DMF waste liquid deacidification equipment is arranged on one side of the distillation tower 2. The reflux component 3 includes a reflux pump 31, a reflux pipe 32 and a conveying component 33. The reflux pipe 32 is connected between the distillation tower 2 and the DMF waste liquid deacidification equipment. The reflux pump 31 is arranged on the reflux pipe 32, and the conveying component 33 is arranged on the reflux pipe 32. The conveying component 33 is arranged between the reflux pump 31 and the distillation tower 2, that is, the DMF waste liquid discharged from the desulfurization tower can be transported to the inside of the distillation tower 2 for distillation treatment through the reflux pump 31, the conveying component 33 and the reflux pipe 32.

[0025] In particular, the conveying component 33 includes a first branch pipe 331, a second branch pipe 332 and a connecting pipe 334, one end of the first branch pipe 331 and the second branch pipe 332 are connected to the liquid outlet end of the reflux pump 31, the other end of the first branch pipe 331 and the second branch pipe 332 are connected to the reflux pipeline 32, the connecting pipe 334 is fixedly connected between the first branch pipe 331 and the second branch pipe 332, and a filter 333 is fixedly installed on the first branch pipe 331 and the second branch pipe 332. The filter 333 can filter the DMF waste liquid transported by the desulfurization tower, and the first branch pipe 331, the second branch pipe 332 and the connecting pipe 334 are connected and coordinated to change the DMF waste liquid transportation path, and the filter 333 is located at one end of the connecting pipe 334 away from the reflux pump 31. On the side, the solenoid valve 335 is fixedly installed on the first branch pipe 331 and the second branch pipe 332, that is, under the action of the solenoid valve 335 and the control valve 337, multiple conveying paths for DMF waste liquid can be formed, the reflux pump 31, the first branch pipe 331 and the reflux pipe 32 form one path, the reflux pump 31, the second branch pipe 332 and the reflux pipe 32 form one path, the reflux pump 31, the first branch pipe 331, the second branch pipe 332 and the reflux pipe 32 form one path, the reflux pump 31, the first branch pipe 331, the connecting pipe 334, the second branch pipe 332 and the reflux pipe 32 form one path, and the first branch pipe 331, the connecting pipe 334, the second branch pipe 332 are formed. The path formed by the first branch pipe 331, the connecting pipe 334 and the second branch pipe 332 is discharged separately from the end of the first branch pipe 331 or the end of the second branch pipe 332.

[0026] Furthermore, a first check valve 336 is fixedly installed on the first branch pipe 331 and the second branch pipe 332, and the first check valve 336 is located between the solenoid valve 335 and the connecting pipe 334. A control valve 337 is fixedly installed on the first branch pipe 331 and the second branch pipe 332, and a second check valve 338 is fixedly installed on the first branch pipe 331 and the second branch pipe 332. The first check valve 336 and the second check valve 338 can prevent backflow between the first branch pipe 331 and the second branch pipe 332. The control valve 337 is located between the connecting pipe 334 and the filter 333, and the filter 333 is located between the second check valve 338 and the control valve 337.

[0027] Furthermore, a flow meter 34 and a pressure gauge 35 are connected to the reflux pipe 32, and the flow meter 34 and the pressure gauge 35 are located between the conveying component 33 and the reflux pump 31. The flow meter 34 and the pressure gauge 35 are used to detect the flow rate and pressure of the DMF waste liquid conveyed by the conveying component 33, so as to determine whether the reflux pipe 32 is blocked, that is, the filter 333 is blocked, and then the DMF waste liquid conveying path on the conveying component 33 is changed, and the filter 333 on the first branch pipe 331 or the second branch pipe 332 can be cleaned separately.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste liquid distillation system, comprising a main conveying line (1), a distillation tower (2) and a connecting pipeline, wherein the distillation tower (2) is connected to the main conveying line (1), and the distillation tower (2) is used for distillation treatment of DMF waste liquid; It is characterized in that One side of the distillation tower (2) is connected to a reboiler (4) via a connecting pipeline, and one side of the distillation tower (2) is provided with a reflux component (3) connected to a DMF waste liquid deacidification device, and the reflux component (3) comprises: A reflux pipeline (32), wherein the reflux pipeline (32) is connected between the distillation tower (2) and the DMF waste liquid deacidification device; A reflux pump (31), wherein the reflux pump (31) is arranged on the reflux pipeline (32); A conveying component (33), wherein the conveying component (33) is arranged on the reflux pipeline (32), and the conveying component (33) is arranged between the reflux pump (31) and the distillation tower (2).

2. A waste liquid distillation system according to claim 1, characterized in that: A liquid discharge pipe (5) connected to the DMF waste liquid deacidification device is provided on one side of the distillation tower (2); the air inlet end of the reboiler (4) is connected to an external steam pipe; and a valve is connected to the end of the reboiler (4).

3. A waste liquid distillation system according to claim 1, characterized in that: The conveying assembly (33) comprises: A first branch pipe (331) and a second branch pipe (332), wherein one end of the first branch pipe (331) and the second branch pipe (332) are connected to the liquid outlet end of the reflux pump (31), and the other end of the first branch pipe (331) and the second branch pipe (332) are connected to the reflux pipeline (32); A connecting pipe (334), wherein the connecting pipe (334) is fixedly connected between the first branch pipe (331) and the second branch pipe (332).

4. A waste liquid distillation system according to claim 3, characterized in that: A filter (333) is fixedly mounted on both the first branch pipe (331) and the second branch pipe (332); the filter (333) is located on the side of the connecting pipe (334) away from the reflux pump (31); and a solenoid valve (335) is fixedly mounted on both the first branch pipe (331) and the second branch pipe (332).

5. A waste liquid distillation system according to claim 4, characterized in that: A first check valve (336) is fixedly installed on the first branch pipe (331) and the second branch pipe (332); the first check valve (336) is located between the solenoid valve (335) and the connecting pipe (334); and a control valve (337) is fixedly installed and connected to the first branch pipe (331) and the second branch pipe (332).

6. A waste liquid distillation system according to claim 5, characterized in that: The second check valve (338) is fixedly installed on the first branch pipe (331) and the second branch pipe (332), the control valve (337) is located between the connecting pipe (334) and the filter (333), and the filter (333) is located between the second check valve (338) and the control valve (337).

7. A waste liquid distillation system according to claim 1, characterized in that: The reflux pipe (32) is connected with a flow meter (34) and a pressure gauge (35), and the flow meter (34) and the pressure gauge (35) are located between the conveying component (33) and the reflux pump (31), and the flow meter (34) and the pressure gauge (35) are used to detect the flow rate and pressure of the DMF waste liquid conveyed by the conveying component (33).

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