A pretreatment device for extracting crude phenols from tar processing wastewater

Abstract

This utility model relates to the chemical industry, and more particularly to a pretreatment device for extracting crude phenol from tar processing wastewater. It includes a tank body, with a filter tank at the upper end of the tank body. The filter tank contains multiple layers of detachable filter screens arranged from top to bottom. A connecting pipe is located at the lower end of the filter tank, connecting to the tank body. An inlet pipe is located at the upper end of the filter tank, and a drain valve is located at the lower end of the tank body. A first pH sensor is installed inside the filter tank. An acid tank is located outside the tank body, and an acid pump is installed in the acid tank. The acid pump has an acid pipe. A conical liquid guide block, corresponding to the connecting pipe, is located at the upper end of the tank body. The conical liquid guide block has a cavity, and multiple acid channels communicating with the cavity are located on the side of the conical liquid guide block. The acid pipe is connected to the lower end of the conical liquid guide block and communicates with the cavity. This utility model has the advantage of high acid-base neutralization efficiency.

Description

Technical Field

[0001] This utility model relates to the chemical industry, and in particular to a pretreatment device for extracting crude phenols from tar processing wastewater. Background Technology

[0002] Tar processing wastewater still contains many recyclable substances, including crude phenol. Before extracting crude phenol, the tar processing wastewater needs to be pretreated. During the pretreatment process, suspended solids need to be removed and the pH value needs to be adjusted. The pH value of tar processing wastewater is generally between 9 and 10, and it needs to be adjusted to 3 to 4. This requires adding acid to the tar processing wastewater. Existing pretreatment devices often directly add acid to the tar processing wastewater and then stir it, which has the technical problem of slow acid-base neutralization reaction. Summary of the Invention

[0003] The purpose of this invention is to provide a pretreatment device for extracting crude phenols from tar processing wastewater, which has the advantage of high acid-base neutralization efficiency.

[0004] The technical solution adopted is as follows:

[0005] A pretreatment device for extracting crude phenol from tar processing wastewater includes a tank body. A filter tank is installed at the upper end of the tank body, with multiple layers of detachable filter screens arranged from top to bottom inside the filter tank. A connecting pipe connected to the tank body is installed at the lower end of the filter tank. An inlet pipe is installed at the upper end of the filter tank, and a drain valve is installed at the lower end of the tank body. A first pH sensor is installed inside the filter tank. An acid tank is installed outside the tank body, and an acid pump is installed in the acid tank. An acid pipe is installed on the acid pump. A conical liquid guide block, corresponding to the connecting pipe, is installed at the upper end of the tank body. A cavity is provided inside the conical liquid guide block, and multiple acid channels communicating with the cavity are provided on the side of the conical liquid guide block. The acid pipe is connected to the lower end of the conical liquid guide block and communicates with the cavity. A second pH sensor is installed on the inner wall of the tank body. A control module is installed outside the filter tank, and the control module is connected to the first pH sensor, the second pH sensor, and the acid pump.

[0006] Preferably, the lower end of the conical liquid guide block is provided with a driving mechanism, the driving mechanism is protected against acid corrosion, the driving mechanism includes a vertically extending driving shaft, the lower end of the driving shaft is provided with a stirring mechanism, the stirring mechanism includes a metal support, and the outer side of the metal support is provided with a plastic protective layer.

[0007] Preferably, the tank includes an inner shell and an outer shell, a sealed cavity is provided between the inner shell and the outer shell, heat transfer oil and an electric heating tube are provided in the sealed cavity, and a temperature sensor is provided inside the tank.

[0008] Preferably, the first pH sensor is positioned below the multi-layer filter.

[0009] Preferably, all the acid channels extend downwards and outwards.

[0010] Preferably, a liquid level sensor is installed inside the tank.

[0011] Compared to existing technologies, the advantages are:

[0012] 1. After being filtered by the filter tank, the waste liquid flows to the conical liquid guide block, which divides the waste liquid along the conical liquid guide block. The acid liquid is transported to the cavity through the acid liquid pipe and then discharged from each acid liquid channel to the side of the conical liquid guide block. The waste liquid is discharged from the connecting pipe onto the conical liquid guide block to mix with the acid liquid and adjust the pH value. After mixing evenly, the acid-base neutralization reaction block is formed.

[0013] 2. The drive mechanism mixes the liquid in the tank through the stirring mechanism, accelerating the neutralization reaction.

[0014] 3. Heat transfer oil and electric heating tubes heat the waste liquid inside the tank, increasing the temperature and thus accelerating the neutralization reaction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal three-dimensional structure of a pretreatment device for extracting crude phenols from tar processing wastewater according to this utility model.

[0016] Figure 2 yes Figure 1 Schematic diagram of the structure at point A;

[0017] Figure 3 This is a schematic diagram of the internal front view of a pretreatment device for extracting crude phenols from tar processing wastewater according to this utility model.

[0018] In the diagram: 1. Tank body; 2. Inner shell; 3. Outer shell; 4. Sealed cavity; 5. Heating element; 6. Temperature sensor; 7. Filter tank; 8. Filter screen; 9. Connecting pipe; 10. Inlet pipe; 11. Drain valve; 12. First pH sensor; 13. Acid tank; 14. Conical guide block; 15. Crossbeam; 16. Acid pipe; 17. Acid channel; 18. Cavity; 19. Second pH sensor; 20. Liquid level sensor; 21. Control module; 22. Drive mechanism; 23. Drive shaft; 24. Stirring mechanism; 25. Anti-acid corrosion protective layer. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments. Please refer to the following description. Figures 1 to 3 :

[0020] Example 1: A pretreatment device for extracting crude phenol from tar processing wastewater includes a tank 1, a filter tank 7 is provided at the upper end of the tank 1, and multiple layers of filter screens 8 are detachably installed inside the filter tank 7 from top to bottom. The multiple layers of filter screens 8 are cleaned and replaced regularly to ensure good filtration effect.

[0021] The filter tank 7 has a connecting pipe 9 at its lower end that connects to the tank body 1, an inlet pipe 10 at its upper end, a drain valve 11 at the lower end of the tank body 1, a first pH sensor 12 inside the filter tank 7 to measure the pH of the waste liquid, an acid tank 13 outside the tank body 1, and a conical liquid guiding block 14 corresponding to the connecting pipe 9 at the upper end of the tank body 1. The conical liquid guiding block 14 is connected to the tank body 1 by a crossbeam 15. The inner wall is fixedly connected, and the acid tank 13 is equipped with an acid pump. The acid pump is equipped with an acid pipe 16 extending into the tank body 1. The conical liquid guide block 14 is provided with a cavity 18. The side of the conical liquid guide block 14 is provided with multiple acid channels 17 communicating with the cavity 18. The acid pipe 16 is connected to the lower end of the conical liquid guide block 14 and communicates with the cavity 18. The acid pump delivers the acid in the acid tank 13 to the cavity 18 and flows from the acid channels 17 to the side of the conical liquid guide block 14.

[0022] A second pH sensor 19 is installed on the inner wall of the tank 1. The second pH sensor 19 monitors the pH value of the waste liquid in the tank 1. A control module 21 is installed on the outer side of the filter tank 7. The control module 21 is connected to the first pH sensor 12, the second pH sensor 19 and the acid pump.

[0023] Example 2: A pretreatment device for extracting crude phenol from tar processing wastewater includes a tank 1, which includes an inner shell 2 and an outer shell 3. A sealed cavity 4 is provided between the inner shell 2 and the outer shell 3. A heat transfer oil and an electric heating tube 5 are provided in the sealed cavity 4. The electric heating tube 5 is connected to corresponding power supply and electrical control equipment. The electric heating tube 5 heats the heat transfer oil, thereby heating the waste liquid inside the tank 1, increasing the temperature and accelerating the neutralization reaction rate. A temperature sensor 6 is provided inside the tank 1 to monitor the temperature of the waste liquid. A filter tank 7 is provided at the upper end of the tank 1. Multiple layers of filter screens 8 are detachably installed inside the filter tank 7 from top to bottom. The multiple layers of filter screens 8 are cleaned and replaced regularly to ensure good filtration effect.

[0024] The filter tank 7 is provided with a connecting pipe 9 at the lower end, which is connected to the tank body 1. The filter tank 7 is provided with an inlet pipe 10 at the upper end. The tank body 1 is provided with a drain valve 11 at the lower end. The filter tank 7 is provided with a first pH sensor 12, which measures the pH value of the waste liquid. The first pH sensor 12 is located below the multi-layer filter screen 8 to measure the pH value of the filtered waste liquid, and the measurement result is more accurate.

[0025] An acid tank 13 is installed on the outside of the tank body 1. A conical liquid guide block 14, corresponding to the connecting pipe 9, is installed at the upper end of the inside of the tank body 1. The conical liquid guide block 14 is fixedly connected to the inner wall of the tank body 1 by a crossbeam 15. An acid pump is installed in the acid tank 13. The acid pump is equipped with an acid pipe 16 extending into the tank body 1. A cavity 18 is provided inside the conical liquid guide block 14. Multiple acid channels 17 communicating with the cavity 18 are provided on the side of the conical liquid guide block 14. The acid pipe 16 is connected to the lower end of the conical liquid guide block 14 and communicates with the cavity 18. The acid pump delivers the acid in the acid tank 13 to the cavity 18 and flows from the acid channels 17 to the side of the conical liquid guide block 14. The acid channels 17 all extend downwards and outwards to prevent waste liquid from flowing back into the cavity 18 along the acid channels 17.

[0026] A second pH sensor 19 is installed on the inner wall of the tank 1 to monitor the pH value of the waste liquid in the tank 1. A liquid level sensor 20 is installed inside the tank 1 to monitor the liquid level in the tank 1. A control module 21 is installed on the outside of the filter tank 7. The control module 21 is connected to the first pH sensor 12, the second pH sensor 19 and the acid pump. After the waste liquid enters the filter tank 7, the first pH sensor 12 measures the pH value of the waste liquid and transmits the data to the control module 21. The control module 21 calculates the required amount of acid based on the volume of the tank 1, and adjusts the power of the acid pump by frequency conversion to change the acid delivery speed so that the acid and waste liquid are discharged at the same time. The acid is transported to the cavity 18 through the acid pipe 16 and then discharged to the side of the conical liquid guide block 14 through each acid channel 17. The waste liquid is discharged from the connecting pipe 9 onto the conical liquid guide block 14 to mix with the acid and adjust the pH value.

[0027] The lower end of the conical liquid guide block 14 is provided with a drive mechanism 22. The drive mechanism 22 is covered with an acid-resistant protective layer 25. The drive mechanism 22 includes a vertically extending drive shaft 23. The lower end of the drive shaft 23 is provided with a stirring mechanism 24. The stirring mechanism 24 includes a metal support. The outer side of the metal support is provided with a plastic protective layer. The plastic protective layer serves to prevent acid corrosion. The drive mechanism 22 mixes the liquid in the tank 1 through the stirring mechanism 24 to accelerate the reaction speed.

[0028] The specific working process is as follows: Waste liquid is transported from inlet pipe 10 to filter tank 7. The multi-layer filter screen in filter tank 7 filters the suspended solids in the waste liquid. The first pH sensor 12 measures the initial pH value of the waste liquid and transmits the data to control module 21. Control module 21 calculates the required amount of acid based on the volume of tank 1, adjusts the power of the acid pump using frequency conversion, and changes the acid delivery speed. The filtered waste liquid flows into tank 1 from connecting pipe 9. The waste liquid is diverted along the conical liquid guide block. The acid is transported to cavity 18 via acid pipe 16 and then discharged from each acid channel 17 to the side of conical liquid guide block 14. The waste liquid is discharged from connecting pipe 9 onto conical liquid guide block 14 and reacts with the acid. The liquid is mixed and the pH value is adjusted. At the same time, the drive mechanism 22 is started and the stirring mechanism 24 is used to stir the waste liquid to accelerate the reaction speed. When the temperature sensor 6 detects that the temperature of the waste liquid is too low, the electric heating tube 5 is started and the waste liquid in the tank 1 is stirred with heat transfer oil. After the waste liquid and acid are released, the pH value of the liquid in the tank 1 is measured by the second pH value sensor 19. When it is between 3 and 4, it is considered to meet the standard. When the pH value is high, the control module 21 controls the acid pump to deliver acid to the tank 1 until the pH value meets the standard. When the pH value is low, the waste liquid is delivered to the tank 1 until the pH value meets the standard. The waste liquid after filtration and pH adjustment is delivered out of the tank 1 for subsequent extraction of crude phenol.

[0029] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A pretreatment device for extracting crude phenols from tar processing wastewater, characterized in that: The system includes a tank body (1), a filter tank (7) at the upper end of the tank body (1), a multi-layer filter screen (8) detachably installed inside the filter tank (7) from top to bottom, a connecting pipe (9) connected to the tank body (1) at the lower end of the filter tank (7), an inlet pipe (10) at the upper end of the filter tank (7), a drain valve (11) at the lower end of the tank body (1), a first pH sensor (12) inside the filter tank (7), an acid tank (13) outside the tank body (1), an acid pump inside the acid tank (13), an acid pipe (16) inside the acid pump, and a connection pipe (9) at the upper end of the tank body (1). There is a conical liquid guide block (14) corresponding to the upper and lower parts of the connecting pipe (9). A cavity (18) is provided inside the conical liquid guide block (14). Multiple acid channels (17) communicating with the cavity (18) are provided on the side of the conical liquid guide block (14). The acid pipe (16) is connected to the lower end of the conical liquid guide block (14) and communicates with the cavity (18). A second pH sensor (19) is provided on the inner wall of the tank (1). A control module (21) is provided on the outer side of the filter tank (7). The control module (21) is connected to the first pH sensor (12), the second pH sensor (19) and the acid pump.

2. The pretreatment device for extracting crude phenols from tar processing wastewater as described in claim 1, characterized in that: The lower end of the conical liquid guide block (14) is provided with a drive mechanism (22), and the drive mechanism (22) is covered with an acid-resistant protective layer (25). The drive mechanism (22) includes a vertically extending drive shaft (23), and the lower end of the drive shaft (23) is provided with a stirring mechanism (24). The stirring mechanism (24) includes a metal bracket, and the outer side of the metal bracket is provided with a plastic protective layer.

3. The pretreatment device for extracting crude phenols from tar processing wastewater as described in claim 1, characterized in that: The tank (1) includes an inner shell (2) and an outer shell (3). A sealed cavity (4) is provided between the inner shell (2) and the outer shell (3). Heat transfer oil and electric heating tube (5) are provided in the sealed cavity (4). A temperature sensor (6) is provided in the tank (1).

4. The pretreatment device for extracting crude phenols from tar processing wastewater as described in claim 1, characterized in that: The first pH sensor (12) is positioned below the multi-layer filter (8).

5. The pretreatment device for extracting crude phenols from tar processing wastewater as described in claim 1, characterized in that: The acid channels (17) mentioned above all extend downwards and outwards.

6. The pretreatment device for extracting crude phenols from tar processing wastewater as described in claim 1, characterized in that: A liquid level sensor (20) is installed inside the tank (1).

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