Waste liquid desulfurization system

Abstract

The utility model discloses a waste liquid desulfurization system which comprises a conveying main line, a desulfurization tower and a connecting pipeline, a liquid inlet of the desulfurization tower is connected with a liquid inlet pipeline, a liquid outlet end at the bottom of the desulfurization tower is connected with a liquid outlet pipeline, and a first backflow assembly is arranged on one side of the desulfurization tower. The first backflow assembly is used for enabling waste liquid treated by the desulfurizing tower to flow back into the desulfurizing tower again, a second backflow assembly is arranged on one side of the desulfurizing tower, the first cooler is connected with the desulfurizing tower through a connecting pipeline, and the discharging tank is connected with the desulfurizing tower through a connecting pipeline; and the first reflux pump is connected between the desulfurization tower and the discharge tank through a first reflux pipeline. According to the utility model, the main line, the desulfurization tower, the first reflux assembly and the second reflux assembly are matched for use, the first reflux assembly can convey waste liquid discharged by the desulfurization tower into the first reflux assembly again for desulfurization treatment, and the second reflux assembly can cool the waste liquid subjected to rectification treatment and convey the waste liquid into the desulfurization tower again.

Description

Technical Field

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

[0002] The wastewater in the production process of microfiber leather varies with the type of leather, production process and formula. Generally speaking, the DMF concentration in the wastewater is about 18% to 28%. In addition, various additives added to the leather ingredients will inevitably be analyzed and remain in the wastewater. There are also some low-molecular products in the resin, which make the solution an emulsion. In addition, calcium and magnesium ions in the water are also components that cannot be ignored. These components other than DMF and water constitute the solid content in the wastewater.

[0003] The DMF recovery device can be roughly divided into three-stage vacuum concentration, feed evaporation, slag removal, vacuum distillation, vacuum deacidification, formic acid neutralization, top water deamination and other steps. When the DMF wastewater is desulfurized and deacidified, the DMF wastewater is usually directly deacidified using a deacidification tower. When the DMF wastewater is deacidified, the DMF wastewater is usually directly input from the top liquid inlet of the deacidification tower and then discharged from the bottom of the deacidification tower. However, when the DMF wastewater is desulfurized and deacidified in the deacidification tower and discharged, the DMF wastewater may be incompletely desulfurized, and it is not convenient to return the DMF wastewater treated by the deacidification tower to the inside of the deacidification tower for desulfurization treatment. Utility Model Content

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

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a waste liquid desulfurization system, including a main transmission line, a desulfurization tower and a connecting pipeline;

[0006] The liquid inlet of the desulfurization tower is connected to a liquid inlet pipeline, the liquid outlet at the bottom of the desulfurization tower is connected to a liquid outlet pipeline, a first reflux component is provided on one side of the desulfurization tower, the first reflux component is used to reflux the waste liquid treated by the desulfurization tower to the interior of the desulfurization tower again, and a second reflux component is provided on one side of the desulfurization tower, the second reflux component is used to cool the waste liquid steam and reflux it to the interior of the desulfurization tower.

[0007] Preferably, the first reflux component comprises:

[0008] A first cooler, wherein the first cooler is connected to the desulfurization tower through a connecting pipeline;

[0009] A discharge tank, wherein the discharge tank is connected to the desulfurization tower through a connecting pipeline;

[0010] A first reflux pipeline and a first reflux pump, wherein the first reflux pump is connected between the desulfurization tower and the discharge tank through the first reflux pipeline.

[0011] Preferably, a pressure gauge is connected to one side of the discharge tank, and a first frequency converter is provided on the first reflux pipeline, and the first frequency converter is located between the first reflux pump and the desulfurization tower.

[0012] Preferably, a finished product storage tank is provided on one side of the discharge tank, a discharge pipeline is connected between the finished product storage tank and the discharge tank, a discharge pump is provided on the discharge pipeline, and a second frequency converter is provided on the discharge pipeline.

[0013] Preferably, the second reflux component comprises:

[0014] A cooling storage tank and a second reflux pipeline, wherein the cooling storage tank is connected to the desulfurization tower via the second reflux pipeline;

[0015] A second cooler is connected to the cooling storage tank through a connecting pipeline.

[0016] Preferably, a second reflux pump is provided on the second reflux pipeline, a third frequency converter is provided on the second reflux pipeline, the third frequency converter is located between the second reflux pump and the desulfurization tower, and the liquid inlet end of the second cooler is connected to a gas supply branch line.

[0017] Preferably, the liquid outlet end of the second cooler and the liquid outlet end of the first cooler are both connected to a cooling water return pipe, and the liquid inlet end of the second cooler and the liquid inlet end of the first cooler are both connected to a cooling water supply pipe.

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

[0019] The utility model utilizes the coordinated use of a main line, a desulfurization tower, a first reflux component and a second reflux component. The first reflux component can transport the waste liquid discharged from the desulfurization tower back into the desulfurization tower for desulfurization treatment, and the second reflux component can cool the waste liquid treated by distillation and transport it back into the desulfurization tower, thereby ensuring the efficiency of the desulfurization treatment of the waste liquid. 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 first reflux component of the utility model.

[0022] Figure 3 This is a block diagram of the second reflux component of the present invention.

[0023] In the figure: 1. main conveying line; 2. desulfurization tower; 3. liquid inlet pipeline; 4. liquid outlet pipeline; 5. first reflux component; 51. first cooler; 52. discharge tank; 53. first reflux pump; 54. discharge pump; 55. first inverter; 56. first reflux pipeline; 57. discharge pipeline; 58. second inverter; 59. finished product storage tank; 6. second reflux component; 61. second cooler; 62. cooling storage tank; 63. air supply branch line; 64. second reflux pipeline; 65. second reflux pump; 66. third inverter; 67. cooling water return pipe; 68. cooling water supply pipe. DETAILED DESCRIPTION

[0024] 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.

[0025] The utility model provides Figure 1-3The waste liquid desulfurization system shown in the figure comprises a main conveying line 1, a desulfurization tower 2 and a connecting pipeline. The main conveying line 1 is used for conveying DMF waste liquid for treatment. The three-stage vacuum concentration, feed evaporation, slag removal, vacuum distillation, vacuum deacidification, formic acid neutralization, tower top water deamine and other steps of DMF waste liquid treatment are all connected to the main conveying line 1, that is, the desulfurization tower 2 is used for desulfurization treatment of DMF waste liquid transported in the main conveying line 1. The liquid inlet of the desulfurization tower 2 is connected to the liquid inlet pipeline 3, and the liquid outlet end at the bottom of the desulfurization tower 2 is connected to the liquid outlet end of the desulfurization tower 2. A liquid outlet pipeline 4 is connected to the desulfurization tower 2. A first reflux component 5 is provided on one side of the desulfurization tower 2. The first reflux component 5 is used to reflux the waste liquid processed by the desulfurization tower 2 to the inside of the desulfurization tower 2 again. A second reflux component 6 is provided on one side of the desulfurization tower 2. The second reflux component 6 is used to cool the waste liquid steam and reflux it to the inside of the desulfurization tower 2. The first reflux component 5 includes a first cooler 51, a discharge tank 52, a first reflux pipeline 56 and a first reflux pump 53. The first cooler 51 is connected to the desulfurization tower 2 through a connecting pipeline. The first reflux pump 53 is connected to the desulfurization tower 2, and the discharge tank 52 is connected to the desulfurization tower 2 through a connecting pipeline. The first reflux pump 53 is connected between the desulfurization tower 2 and the discharge tank 52 through a first reflux pipeline 56. The DMF waste liquid treated by the desulfurization tower 2 is cooled by the first cooler 51 and then transported to the discharge tank 52. Then, the DMF waste liquid in the discharge tank 52 that is not completely desulfurized is transported to the desulfurization tower 2 through the first reflux pump 53 and the first reflux pipeline 56 for further treatment. The second reflux component 6 includes a second cooler 61, The cooling storage tank 62 and the second reflux pipeline 64, the cooling storage tank 62 is connected to the desulfurization tower 2 through the second reflux pipeline 64, the second cooler 61 is connected to the cooling storage tank 62 through a connecting pipeline, the liquid inlet end of the second cooler 61 is connected to the gas supply branch line 63, the gas supply branch line 63 is the steam of the DMF waste liquid after distillation treatment, which is cooled by the second cooler 61 and then enters the cooling storage tank 62, and then is transported to the inside of the desulfurization tower 2 by the second reflux pump 65 for desulfurization treatment.

[0026] Furthermore, a pressure gauge is connected to one side of the discharge tank 52, and the pressure gauge can detect the pressure of the liquid stored inside the discharge tank 52, so that after a certain amount of liquid is stored inside, the stored liquid is discharged. A first frequency converter 55 is arranged on the first reflux pipeline 56, and the first frequency converter 55 is located between the first reflux pump 53 and the desulfurization tower 2. A finished product storage tank 59 is arranged on one side of the discharge tank 52, and solenoid valves are arranged on the discharge pipeline 57 and the first reflux pipeline 56, so that when the DMF waste liquid inside the desulfurization tower 2 is completely desulfurized, it enters the interior of the discharge tank 52, and then is transported to the finished product storage tank 59 for storage by the discharge pipeline 57 and the discharge pump 54. A discharge pipeline 57 is connected between the finished product storage tank 59 and the discharge tank 52, and a discharge pump 54 is arranged on the discharge pipeline 57, and a second frequency converter 58 is arranged on the discharge pipeline 57.

[0027] Furthermore, a second reflux pump 65 is provided on the second reflux pipeline 64, and a third frequency converter 66 is provided on the second reflux pipeline 64. The third frequency converter 66 is located between the second reflux pump 65 and the desulfurization tower 2. The liquid outlet end of the second cooler 61 and the liquid outlet end of the first cooler 51 are both connected to a cooling water return pipe 67, and the liquid inlet end of the second cooler 61 and the liquid inlet end of the first cooler 51 are both connected to a cooling water supply pipe 68. The cooling water supply pipe 68 and the cooling water return pipe 67 can transport cooling water to the second cooler 61 and the first cooler 51, so that the second cooler 61 cools the DMF waste liquid discharged from the desulfurization tower 2, and the first cooler 51 cools the DMF waste liquid vapor treated by distillation.

[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 desulfurization system, comprising a main transmission line (1), a desulfurization tower (2) and connecting pipelines; It is characterized by: The liquid inlet of the desulfurization tower (2) is connected to a liquid inlet pipeline (3), and the liquid outlet end at the bottom of the desulfurization tower (2) is connected to a liquid outlet pipeline (4). A first reflux component (5) is provided on one side of the desulfurization tower (2), and the first reflux component (5) is used to reflux the waste liquid treated by the desulfurization tower (2) back to the interior of the desulfurization tower (2). A second reflux component (6) is provided on one side of the desulfurization tower (2), and the second reflux component (6) is used to cool the waste liquid steam and reflux it to the interior of the desulfurization tower (2).

2. A waste liquid desulfurization system according to claim 1, characterized in that: The first reflux component (5) comprises: a first cooler (51), the first cooler (51) being connected to the desulfurization tower (2) via a connecting pipeline; a discharge tank (52), wherein the discharge tank (52) is connected to the desulfurization tower (2) via a connecting pipeline; A first reflux pipeline (56) and a first reflux pump (53), wherein the first reflux pump (53) is connected between the desulfurization tower (2) and the discharge tank (52) through the first reflux pipeline (56).

3. A waste liquid desulfurization system according to claim 2, characterized in that: A pressure gauge is connected to one side of the discharge tank (52), and a first frequency converter (55) is provided on the first reflux pipeline (56). The first frequency converter (55) is located between the first reflux pump (53) and the desulfurization tower (2).

4. A waste liquid desulfurization system according to claim 3, characterized in that: A finished product storage tank (59) is provided on one side of the discharge tank (52), a discharge pipeline (57) is connected between the finished product storage tank (59) and the discharge tank (52), a discharge pump (54) is provided on the discharge pipeline (57), and a second frequency converter (58) is provided on the discharge pipeline (57).

5. A waste liquid desulfurization system according to claim 2, characterized in that: The second reflux component (6) comprises: a cooling storage tank (62) and a second reflux pipeline (64), wherein the cooling storage tank (62) is connected to the desulfurization tower (2) via the second reflux pipeline (64); The second cooler (61) is connected to the cooling storage tank (62) through a connecting pipeline.

6. A waste liquid desulfurization system according to claim 5, characterized in that: The second reflux pipeline (64) is provided with a second reflux pump (65), the second reflux pipeline (64) is provided with a third frequency converter (66), the third frequency converter (66) is located between the second reflux pump (65) and the desulfurization tower (2), and the liquid inlet end of the second cooler (61) is connected to the gas supply branch line (63).

7. A waste liquid desulfurization system according to claim 5, characterized in that: The liquid outlet end of the second cooler (61) and the liquid outlet end of the first cooler (51) are both connected to a cooling water return pipe (67), and the liquid inlet end of the second cooler (61) and the liquid inlet end of the first cooler (51) are both connected to a cooling water supply pipe (68).

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