Phenol extraction system for semi-coke wastewater treatment

Abstract

A phenol extraction system for semi-coke wastewater treatment is characterized in that a solvent conveying header pipe is divided into two paths, one path is connected with a solvent inlet in the lower part of a first extraction tower, and the other path is connected with a solvent inlet in the lower part of a second extraction tower; the upper part of the first extraction tower is connected with a wastewater input pipe and an extract overflow pipe, an extract input port at the lower part of the first extraction tower is connected with an extract output port of an extract tank through an extract conveying pump set, and an extract input port of the extract tank is connected with an extract output port at the upper part of the second extraction tower; a wastewater output port at the bottom of the first extraction tower is connected with an input port of a wastewater conveying pump set I, an output port of the wastewater conveying pump set I is connected with a wastewater inlet at the upper part of the second extraction tower, and a wastewater output port at the bottom of the second extraction tower is connected with an input port of a wastewater conveying pump set II; and an output port of the wastewater conveying pump set II is connected with the extracted wastewater conveying pipe. The device disclosed by the utility model has the advantages of high removal efficiency of phenolic substances and stability in operation.

Description

Technical Field

[0001] This utility model belongs to the field of semi-coke wastewater treatment technology, specifically relating to a phenol extraction system for semi-coke wastewater treatment. Background Technology

[0002] The production of semi-coke generates a large amount of wastewater containing high concentrations of phenolic pollutants, posing a serious threat to the environment and human health. In traditional semi-coke wastewater treatment methods, the phenol extraction system is a key component. This system primarily uses organic solvents to extract phenolic substances from the wastewater, thereby reducing the pollution load.

[0003] However, existing phenol extraction systems have some shortcomings in practical applications. For example, the flow control of solvent and wastewater is not precise enough, leading to unstable flow rates and large fluctuations in liquid level, which in turn results in unstable extraction efficiency and significant fluctuations in removal rate of phenolic substances. In addition, the liquid level control devices in some extraction towers are not perfect, and cannot monitor and adjust the liquid level accurately in real time, which can easily lead to excessively high or low liquid levels, thereby affecting the stability and safety of the extraction process. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a safe, stable and highly efficient phenol extraction system for treating semi-coke wastewater.

[0005] The technical solution adopted to solve the above technical problems is: a phenol extraction system for treating semi-coke wastewater, wherein the solvent delivery main pipe is divided into two paths, one path is connected to the solvent inlet at the bottom of the first extraction tower, and the other path is connected to the solvent inlet at the bottom of the second extraction tower. The upper part of the first extraction tower is connected to a wastewater input pipe and an extract overflow pipe. The lower extract input port is connected to the extract output port of the extract tank through an extract delivery pump group. The extract input port of the extract tank is connected to the extract output port at the top of the second extraction tower. The wastewater output port at the bottom of the first extraction tower is connected to the input port of wastewater delivery pump group I. The output port of wastewater delivery pump group I is connected to the wastewater inlet at the top of the second extraction tower. The wastewater output port at the bottom of the second extraction tower is connected to the input port of wastewater delivery pump group II. The output port of wastewater delivery pump group II is connected to the wastewater delivery pipe after extraction.

[0006] A first liquid level display and control alarm is installed on the upper part of the first extraction tower. A first liquid level regulating valve is installed between the output port of the wastewater transfer pump group I and the wastewater inlet on the upper part of the second extraction tower. The first liquid level regulating valve is electrically connected to the first liquid level display and control alarm.

[0007] A flow display controller and a flow control valve are sequentially arranged along the fluid flow direction on the solvent delivery main pipe. A flow transmitter is arranged upstream of the first liquid level regulating valve. The flow display controller is electrically connected to the flow transmitter and the flow control valve.

[0008] Preferably, the extract tank is equipped with a second liquid level display and control alarm, and the output port of the extract delivery pump group is equipped with a second liquid level control valve. The second liquid level display and control alarm is electrically connected to the second liquid level control valve.

[0009] Preferably, a third liquid level display and control alarm is installed on the upper part of the second extraction tower, and a third liquid level regulating valve is installed on the output port of the wastewater transfer pump group II. The third liquid level regulating valve is electrically connected to the third liquid level display and control alarm.

[0010] Preferably, the extract delivery pump assembly consists of two extract delivery pump units connected in parallel, one of which is a working pump unit and the other is a standby pump unit.

[0011] Preferably, both the wastewater transfer pump group I and the wastewater transfer pump group II consist of two wastewater transfer pump units, one of which is a working pump unit and the other is a standby pump unit.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention employs a dual-extraction tower design and a rationally configured solvent and wastewater transport system, enabling sequential extraction of phenolic substances from semi-coke wastewater in two separate towers, significantly improving phenol removal efficiency. Compared to traditional single-tower extraction or other treatment methods, this technology can process more wastewater in a shorter time, meeting the needs of large-scale wastewater treatment in semi-coke production. It effectively solves the problem of low efficiency in traditional methods, improving production efficiency and continuity.

[0014] This invention achieves precise control of solvent and wastewater flow rates by installing a flow display controller and a flow control valve on the solvent delivery main pipe, and a flow transmitter electrically connected between the output port of wastewater delivery pump unit I and the wastewater inlet at the top of the second extraction tower. This ensures the stability of the extraction process. Simultaneously, level display controllers and corresponding level regulating valves are installed on the first extraction tower, the extract tank, and the second extraction tower, respectively, to monitor and adjust the level in real time. This prevents instability in the extraction effect caused by level fluctuations, maintaining a high and stable removal rate of phenolic substances. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] In the diagram: 1. First extraction tower; 2. First liquid level display and control alarm; 3. Flow control valve; 4. Flow display controller; 5. Second extraction tower; 6. Second liquid level display and control alarm; 7. Second liquid level control valve; 8. Wastewater transfer pump group II; 9. First liquid level regulating valve; 10. Flow transmitter; 11. Wastewater transfer pump group I; 12. Extract tank; 13. Extract transfer pump group; 14. Third liquid level display and control alarm; 15. Third liquid level regulating valve. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0018] exist Figure 1 In this embodiment, a phenol extraction system for treating semi-coke wastewater has a solvent delivery main pipe divided into two branches. One branch is connected to the solvent inlet at the bottom of the first extraction tower 1, and the other branch is connected to the solvent inlet at the bottom of the second extraction tower 5. The upper part of the first extraction tower 1 is connected to a wastewater input pipe and an extract overflow pipe. The lower extract input port is connected to the extract output port of the extract tank 12 via an extract delivery pump group 13. The extract input port of the extract tank 12 is connected to the extract output port at the top of the second extraction tower 5. The wastewater output port at the bottom of the first extraction tower 1 is connected to the input port of the wastewater delivery pump group I11. The output port of the wastewater delivery pump group I11 is connected to the wastewater inlet at the top of the second extraction tower 5. The wastewater output port at the bottom of the second extraction tower 5 is connected to the input port of the wastewater delivery pump group II8. The output port of the wastewater delivery pump group II8 is connected to the wastewater delivery pipe after extraction.

[0019] Wastewater enters the upper part of the first extraction tower 1 through the wastewater inlet pipe. Inside the first extraction tower 1, the wastewater comes into full countercurrent contact with the extraction solvent from the solvent delivery main pipe and the extract from the extract tank 12. Phenolic substances are transferred from the wastewater to the extraction solvent, achieving preliminary extraction of phenolic substances. The extract from the upper part of the first extraction tower 1 is output through the extract overflow pipe. After preliminary extraction, the wastewater is discharged from the wastewater outlet at the bottom of the first extraction tower 1 and is transported to the upper part of the second extraction tower 5 through the wastewater transfer pump group I11. There, it comes into countercurrent contact with the solvent entering from the bottom of the second extraction tower 5, completing the secondary extraction to further remove phenolic substances from the wastewater. The resulting extract enters the extract tank 12, and the generated wastewater is output by the wastewater transfer pump group II8.

[0020] A flow display controller 4 and a flow control valve 3 are installed sequentially along the fluid flow direction on the solvent delivery main pipe. A flow transmitter 10 and a first level regulating valve 9 are installed sequentially along the fluid flow direction on the pipeline between the output port of the wastewater delivery pump unit I11 and the wastewater inlet at the top of the second extraction tower 5. The flow display controller 4 is electrically connected to the flow transmitter 10 and the flow control valve 3. The flow display controller 4 on the solvent delivery main pipe displays the solvent flow rate. The flow transmitter 10 monitors the flow rate of the wastewater output from the first extraction tower 1 and feeds back the flow signal to the flow display controller 4. The flow display controller 4 transmits the control signal to the flow control valve 3. The flow control valve 3 automatically adjusts the solvent delivery flow rate according to the signal, forming a closed-loop control to ensure stable solvent flow.

[0021] A first liquid level display and control alarm 2 is installed on the upper part of the first extraction tower 1, and a first liquid level regulating valve 9 is electrically connected to the first liquid level display and control alarm 2. The first liquid level display and control alarm 2 can monitor the liquid level in the first extraction tower 1 in real time and transmit the signal to the first liquid level regulating valve 9. The first liquid level regulating valve 9 automatically adjusts the flow rate of wastewater entering the second extraction tower 5 according to the signal to ensure the stability of the liquid level in the first extraction tower 1.

[0022] A second liquid level display and control alarm 6 is installed on the extract tank 12 to monitor the liquid level in the extract tank 12 in real time. A second liquid level control valve 7 is installed on the pipeline between the output port of the extract delivery pump group 13 and the extract input port of the first extraction tower 1. The second liquid level display and control alarm 6 is electrically connected to the second liquid level control valve 7. The second liquid level display and control alarm 6 regulates the output flow rate of the extract delivery pump group 13 by controlling the second liquid level control valve 7, thereby maintaining the stability of the liquid level in the extract tank 12.

[0023] A third liquid level display and control alarm 14 is installed on the upper part of the second extraction tower 5, and a third liquid level regulating valve 15 is installed on the output port of the wastewater transfer pump group II 8. The third liquid level regulating valve 15 is electrically connected to the third liquid level display and control alarm 14. The third liquid level display and control alarm 14 is used to monitor the liquid level in the second extraction tower 5 and control the third liquid level regulating valve 15 to regulate the output flow of the wastewater transfer pump group II 8, thereby ensuring the stability of the liquid level in the second extraction tower 5.

[0024] The extract transfer pump unit 13 consists of two extract transfer pump units connected in parallel, one of which is the working pump unit and the other is the standby pump unit.

[0025] Both wastewater transfer pump group I11 and wastewater transfer pump group II8 consist of two wastewater transfer pump units, one of which is the working pump unit and the other is the standby pump unit.

[0026] When the working pump unit malfunctions or requires maintenance, the standby pump unit can automatically switch to operation to ensure the normal delivery of the extract.

Claims

1. A phenol extraction system for treating semi-coke wastewater, characterized in that: The solvent delivery main is divided into two lines. One line is connected to the solvent inlet at the bottom of the first extraction tower, and the other line is connected to the solvent inlet at the bottom of the second extraction tower. The upper part of the first extraction tower is connected to a wastewater input pipe and an extract overflow pipe. The lower extract inlet is connected to the extract outlet of the extract tank through an extract delivery pump group. The extract inlet of the extract tank is connected to the extract outlet at the top of the second extraction tower. The wastewater outlet at the bottom of the first extraction tower is connected to the input of wastewater delivery pump group I. The output of wastewater delivery pump group I is connected to the wastewater inlet at the top of the second extraction tower. The wastewater outlet at the bottom of the second extraction tower is connected to the input of wastewater delivery pump group II. The output of wastewater delivery pump group II is connected to the wastewater delivery pipe after extraction. A first liquid level display and control alarm is installed on the upper part of the first extraction tower. A first liquid level regulating valve is installed between the output port of the wastewater transfer pump group I and the wastewater inlet on the upper part of the second extraction tower. The first liquid level regulating valve is electrically connected to the first liquid level display and control alarm. A flow display controller and a flow control valve are sequentially arranged along the fluid flow direction on the solvent delivery main pipe. A flow transmitter is arranged upstream of the first liquid level regulating valve. The flow display controller is electrically connected to the flow transmitter and the flow control valve.

2. The phenol extraction system for treating semi-coke wastewater according to claim 1, characterized in that: The extract tank is equipped with a second liquid level display and control alarm, and the output port of the extract delivery pump group is equipped with a second liquid level control valve. The second liquid level display and control alarm is electrically connected to the second liquid level control valve.

3. The phenol extraction system for treating semi-coke wastewater according to claim 1, characterized in that: The second extraction tower is equipped with a third liquid level display and control alarm, and the wastewater transfer pump group II is equipped with a third liquid level regulating valve at its output port. The third liquid level regulating valve is electrically connected to the third liquid level display and control alarm.

4. The phenol extraction system for treating semi-coke wastewater according to claim 1, characterized in that: The extract delivery pump assembly consists of two parallel extract delivery pump units, one of which is the working pump unit and the other is the standby pump unit.

5. The phenol extraction system for treating semi-coke wastewater according to claim 1, characterized in that: Both the wastewater transfer pump group I and the wastewater transfer pump group II consist of two wastewater transfer pump units, one of which is the working pump unit and the other is the standby pump unit.

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