Recycling system for fluorine-removing discharged water and desulfurization process water

Abstract

The utility model provides a recycling system for defluorination external drainage water and desulfurization process water, which comprises a defluorination treatment device, a defluorination external drainage water main pipeline, a Parshall tank and a desulfurization process unit, and the water outlet end of the defluorination treatment device is communicated with the water inlet end of the defluorination external drainage water main pipeline; a first branch pipe, a second branch pipe and a third branch pipe are further arranged at the water outlet end of the defluorination external drainage main pipeline, the water outlet end of the first branch pipe is communicated with the defluorination treatment device, the water outlet end of the second branch pipe is communicated with the water inlet end of the desulfurization process unit, and the water outlet end of the desulfurization process unit is communicated with the defluorination treatment device; and the water outlet end of the third branch pipe is communicated with the Parshall groove. According to the utility model, the resource utilization of the fluorine-removed discharged water is realized, the consumption of fresh water is reduced, the production cost is reduced, the wastewater discharge is reduced, and the pollution to the environment is reduced. The device has the advantages of being simple in structure, stable in operation, remarkable in economic benefit, easy to popularize and apply and the like.

Description

Technical Field

[0001] This utility model relates to the technical field of defluoridation wastewater reuse, specifically to a recycling system for defluoridation wastewater and desulfurization process water. Background Technology

[0002] Industrial production processes, especially coal-fired power plants, generate large amounts of fluoride-containing wastewater. This wastewater typically requires defluorination treatment. During this process, through chemical precipitation, adsorption, or other methods, the fluoride concentration in the wastewater is significantly reduced. This defluorinated wastewater is known as defluorinated wastewater.

[0003] If the effluent from the defluoridation treatment process meets the discharge standards (e.g., fluoride ion concentration below 10 mg / L), it can be directly discharged into water bodies or municipal sewage networks. However, the treated effluent still contains a certain amount of other impurities (e.g., suspended solids, calcium and magnesium ions, sulfate ions, etc.), and its pH value may be too high or too low. Direct discharge will cause environmental pollution and waste of resources.

[0004] Meanwhile, the desulfurization process requires a large amount of water resources. The desulfurization process water is mainly used for demister flushing, absorber makeup water, and wet scrubbing flushing water. The desulfurization process water does not have high requirements for water quality; generally, it is only necessary to control the chloride ion concentration at a suitable level (generally less than 500 mg / L).

[0005] However, even if the fluoride-removed wastewater does not meet discharge standards, it still has relatively low chloride ion levels, fewer impurities, and lower fluoride concentrations. Recycling and reusing this wastewater can not only reduce the consumption of fresh water but also lower wastewater treatment costs.

[0006] Currently, the fluoride removal system discharges its wastewater directly into the Parshall flume during daily operation, resulting in a large amount of wastewater that cannot be effectively utilized and thus a significant amount of water resources cannot be recycled and reused, leading to water resource waste.

[0007] Therefore, there is an urgent need for an efficient and economical method and system for recycling fluoride removal wastewater and desulfurization process water, which is of great practical significance for realizing the resource utilization of fluoride removal wastewater. Utility Model Content

[0008] To address the shortcomings of existing technologies, this invention provides a recycling system for fluoride removal wastewater and desulfurization process water, thereby achieving wastewater resource utilization, reducing fresh water consumption, and minimizing environmental pollution.

[0009] The objective of this utility model is achieved through the following technical solution.

[0010] The present invention provides a recycling system for defluorination wastewater and desulfurization process water, comprising a defluorination treatment device, a defluorination wastewater main pipeline, a Parshall flume, and a desulfurization process unit. The outlet of the defluorination treatment device is connected to the inlet of the defluorination wastewater main pipeline. The outlet of the defluorination wastewater main pipeline is further provided with a first branch pipe, a second branch pipe, and a third branch pipe. The outlet of the first branch pipe is connected to the defluorination treatment device, the outlet of the second branch pipe is connected to the inlet of the desulfurization process unit, the outlet of the desulfurization process unit is connected to the defluorination treatment device, and the outlet of the third branch pipe is connected to the Parshall flume.

[0011] In order to address the characteristics of the fluoride removal wastewater and reduce corrosion of the desulfurization equipment, an additional filtration device and / or water quality conditioning device can be installed between the second branch pipe and the desulfurization process unit.

[0012] Preferably, a filter device for removing suspended solids and trace impurities from the defluorination wastewater is installed between the second branch pipe and the desulfurization process unit. The inlet of the filter device is connected to the outlet of the second branch pipe, and the outlet of the filter device is connected to the inlet of the desulfurization process unit. This allows for further removal of suspended solids and trace impurities from the defluorination wastewater through filtration and adsorption. This reduces the likelihood of clogging the desulfurization process unit equipment and minimizes corrosion.

[0013] Preferably, the filtration device is a sedimentation tank equipped with a filter screen.

[0014] Preferably, a water quality adjustment device for adjusting the pH of the defluorination wastewater is provided between the filtration device and the desulfurization process unit. The outlet of the filtration device is connected to the inlet of the water quality adjustment device, and the outlet of the water quality adjustment device is connected to the inlet of the desulfurization process unit. This allows the defluorination wastewater to be adjusted to neutral pH, minimizing corrosion of the desulfurization process unit equipment.

[0015] Preferably, the water quality conditioning device is a water tank equipped with a pH adjuster.

[0016] Preferably, a pretreatment device for removing impurities from the desulfurization process wastewater is also provided between the desulfurization process unit and the defluorination treatment device. The effluent end of the desulfurization process unit is connected to the influent end of the pretreatment device, and the effluent end of the pretreatment device is connected to the defluorination treatment device. In this way, the desulfurization process water, after being supplied to the demister flushing water, absorber make-up water, wet desulfurization flushing water, etc., can be recycled to the defluorination treatment device for reuse, thereby achieving the purpose of recycling.

[0017] Preferably, the pretreatment device is a sedimentation tank equipped with a filter screen and a cleaning agent.

[0018] Preferably, manual valves are installed on the first, second, and third branch pipes, and manual valves are also installed on the outlet pipes of the desulfurization process unit, filtration device, water quality adjustment device, and pretreatment device. This facilitates maintenance and normal operation of the equipment.

[0019] The technical solution of this utility model produces the following beneficial effects:

[0020] By analyzing and demonstrating the water quality of the defluorination wastewater and the makeup water situation of the desulfurization process, it was proposed that the defluorination wastewater be re-piped to the desulfurization process unit. The treated defluorination wastewater would then be recycled and transported to the desulfurization process unit via pipeline, meeting the daily makeup water requirements of the desulfurization process unit and saving a significant amount of water resources. The equipment water used in the desulfurization process unit, after being defluorinated by the defluorination treatment device, can be recycled again, achieving the goal of recycling.

[0021] This invention further treats the fluoride removal wastewater through filtration and water quality adjustment, allowing it to be recycled back into the desulfurization process water system for reuse. This process reduces the likelihood of clogging desulfurization equipment, minimizes corrosion of desulfurization process units, and achieves resource utilization of the fluoride removal wastewater. It also reduces fresh water consumption, lowers production costs, reduces wastewater discharge, and minimizes environmental pollution. This invention boasts advantages such as simple structure, stable operation, significant economic benefits, and ease of promotion and application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of Embodiment 1 of the present utility model;

[0024] Figure 2 This is a schematic diagram of Embodiment 2 of the present invention;

[0025] Figure 3 This is a schematic diagram of Embodiment 3 of this utility model.

[0026] In the diagram: 1-Defluorination treatment device, 2-Parshall tank, 3-Desulfurization process unit, 4-Filtration device, 5-Water quality adjustment device, 6-Pretreatment device, 7-Manual valve, 8-Defluorination external drainage main pipe, 9-First branch pipe, 10-Second branch pipe, 11-Third branch pipe. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0028] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Please refer to Figures 1 to 3 This invention provides a recycling system for defluorination wastewater and desulfurization process water, including a defluorination treatment device 1, a main defluorination wastewater pipeline 8, a Parshall flume 2, and a desulfurization process unit 3. The outlet of the defluorination treatment device 1 is connected to the inlet of the main defluorination wastewater pipeline 8. The outlet of the main defluorination wastewater pipeline 8 is further provided with a first branch pipe 9, a second branch pipe 10, and a third branch pipe 11. The outlet of the first branch pipe 9 is connected to the defluorination treatment device 1, the outlet of the second branch pipe 10 is connected to the inlet of the desulfurization process unit 3, the outlet of the desulfurization process unit 3 is connected to the defluorination treatment device 1, and the outlet of the third branch pipe 11 is connected to the Parshall flume 2. In this way, the main defluorination wastewater pipeline is further divided into several branch pipes, which can recycle the treated defluorination wastewater, meet the daily water replenishment requirements of the desulfurization process unit, and save a large amount of water resources.

[0030] In order to address the characteristics of the fluoride removal wastewater and reduce corrosion of the desulfurization equipment, an additional filter device 4 and / or water quality conditioning device 5 can be installed between the second branch pipe and the desulfurization process unit.

[0031] In a preferred embodiment, a filter device 4 for removing suspended solids and trace impurities from the defluorination wastewater is installed between the second branch pipe 10 and the desulfurization process unit 3. The inlet of the filter device 4 is connected to the outlet of the second branch pipe 10, and the outlet of the filter device 4 is connected to the inlet of the desulfurization process unit 3. Specifically, the filter device 4 is a sedimentation tank equipped with a filter screen. This prevents clogging of the desulfurization process unit equipment and minimizes corrosion of the equipment.

[0032] In a preferred embodiment, a water quality adjustment device 5 for adjusting the pH of the defluorination wastewater is provided between the filtration device 4 and the desulfurization process unit 3. The outlet of the filtration device 4 is connected to the inlet of the water quality adjustment device 5, and the outlet of the water quality adjustment device 5 is connected to the inlet of the desulfurization process unit 3. Specifically, the water quality adjustment device 5 is a water tank containing a pH adjuster. Acid-base adjusters and softeners can also be added to the water quality adjustment device 5 to adjust the pH and hardness according to the water quality requirements of the desulfurization process water. This minimizes the corrosion of the defluorination wastewater on the desulfurization process unit equipment.

[0033] In a preferred embodiment, a pretreatment device 6 for removing impurities from the desulfurization process wastewater is also provided between the desulfurization process unit 3 and the defluorination treatment device 1. The outlet of the desulfurization process unit 3 is connected to the inlet of the pretreatment device 6, and the outlet of the pretreatment device 6 is connected to the defluorination treatment device 1. Specifically, the pretreatment device 6 is a sedimentation tank equipped with a filter screen and a cleaning agent. In this way, in the desulfurization process unit, the desulfurization process water is supplied to the demister flushing water, absorber make-up water, wet desulfurization flushing water, etc. The equipment water of the desulfurization process unit 3 undergoes pretreatment such as sedimentation and filtration in the pretreatment device 6, and then is defluorinated by the defluorination treatment device 1, and can be recycled again to achieve the purpose of recycling.

[0034] In a preferred embodiment, manual valves 7 are installed on the first branch pipe 9, the second branch pipe 10, and the third branch pipe 11, and manual valves 7 are also installed on the outlet pipes of the desulfurization process unit 3, the filtration device 4, the water quality conditioning device 5, and the pretreatment device 6. This facilitates maintenance and normal operation of the equipment.

[0035] Example 1

[0036] like Figure 1 As shown, the recycling system for defluorination wastewater and desulfurization process water includes a defluorination treatment device 1, a main defluorination wastewater pipeline 8, a Parshall flume 2, and a desulfurization process unit 3. The outlet of the defluorination treatment device 1 is connected to the inlet of the main defluorination wastewater pipeline 8. The outlet of the main defluorination wastewater pipeline 8 is also equipped with a first branch pipe 9, a second branch pipe 10, and a third branch pipe 11. The outlet of the first branch pipe 9 is connected to the defluorination treatment device 1, the outlet of the second branch pipe 10 is connected to the inlet of the desulfurization process unit 3, the outlet of the desulfurization process unit 3 is connected to the defluorination treatment device 1, and the outlet of the third branch pipe 11 is connected to the Parshall flume 2. Manual valves 7 are installed on the first branch pipe 9, the second branch pipe 10, and the third branch pipe 11. A manual valve 7 is also installed on the outlet pipe of the desulfurization process unit 3.

[0037] When using:

[0038] Fluorine-containing wastewater undergoes defluorination treatment in defluorination treatment unit 1 to remove fluorides from the wastewater, resulting in defluorinated wastewater. This wastewater flows into the main defluorinated wastewater pipe 8, and then through three branch pipes—the first branch pipe 9, the second branch pipe 10, and the third branch pipe 11—it flows into different equipment.

[0039] If the wastewater after defluorination fails to meet the discharge standards, open the manual valve 7 on the first branch pipe 9 and return it to the defluorination treatment device 1 through the first branch pipe 9 for defluorination treatment again.

[0040] If the wastewater discharged after defluorination meets the emission standards after testing, the manual valve 7 on the third branch pipe 11 can be opened to discharge it directly to the Parshall flume 2 through the third branch pipe 11, and the discharge will meet the standards. Alternatively, the manual valve 7 on the second branch pipe 10 can be opened to allow the wastewater to enter the desulfurization process unit 3 through the second branch pipe 10, and be used for flushing water for the demister, replenishing water for the absorption tower, and flushing water for the wet desulfurization process unit 3.

[0041] Open the manual valve 7 on the outlet pipe of the desulfurization process unit 3. The wastewater discharged from the desulfurization process unit 3 can be recycled to the defluorination treatment device 1 and reused after defluorination to achieve the purpose of recycling.

[0042] Example 2

[0043] like Figure 2 As shown, the difference between Example 2 and Example 1 is that:

[0044] A filter device 4 for removing suspended solids and trace impurities from the defluorination wastewater and a water quality adjustment device 5 for adjusting the pH of the defluorination wastewater are installed between the second branch pipe 10 and the desulfurization process unit 3.

[0045] The inlet of filter device 4 is connected to the outlet of the second branch pipe 10, the outlet of filter device 4 is connected to the inlet of water quality conditioning device 5, and the outlet of water quality conditioning device 5 is connected to the inlet of desulfurization process unit 3. Filter device 4 is a sedimentation tank equipped with a filter screen. Water quality conditioning device 5 is a water tank equipped with a pH adjusting agent. Manual valves 7 are installed on the outlet pipes of desulfurization process unit 3, filter device 4, and water quality conditioning device 5.

[0046] When using filtration device 4 and water quality conditioning device 5: If the defluoridated wastewater fails to meet discharge standards after testing, it will be treated by filtration, pH adjustment, and hardness adjustment according to the water quality requirements of the desulfurization process water to ensure it meets the usage standards of the desulfurization process water. Manual valve 7 on the second branch pipe 10 can be opened, allowing the wastewater to sequentially enter filtration device 4 and water quality conditioning device 5. Filtration device 4 will filter and adsorb the defluoridated wastewater to remove suspended solids and trace impurities. Then, acid-base regulators and softeners will be added to water quality conditioning device 5 to adjust the pH and hardness of the wastewater. Opening the corresponding manual valve 7 allows the treated defluoridated wastewater to be transported to desulfurization process unit 3 for further recycling.

[0047] The remaining operations are the same as in Example 1.

[0048] Example 3

[0049] like Figure 3 As shown, the difference between Example 3 and Example 2 is that:

[0050] A pretreatment device 6 for removing impurities from the desulfurization wastewater is also installed between the desulfurization process unit 3 and the defluorination treatment device 1. The effluent end of the desulfurization process unit 3 is connected to the influent end of the pretreatment device 6, and the effluent end of the pretreatment device 6 is connected to the defluorination treatment device 1. The pretreatment device 6 is a sedimentation tank equipped with a filter screen and a cleaning agent. Manual valves 7 are installed on the effluent pipes of the pretreatment device 6.

[0051] When using pretreatment device 6: In desulfurization process unit 2, desulfurization process water is supplied to equipment such as demister flushing water, absorber makeup water, and wet desulfurization flushing water. The equipment water in desulfurization process unit 3 undergoes pretreatment by pretreatment device 6 through sedimentation, filtration, or chemical precipitation. After opening the corresponding manual valve 7, the defluorination treatment device 1 removes the defluorination before subsequent recycling.

[0052] The remaining operations are the same as in Example 2.

[0053] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, 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 recycling system for defluoridated wastewater and desulfurization process water, comprising a defluoridation treatment device (1), a defluoridated wastewater main pipeline (8), a Parshall flume (2), and a desulfurization process unit (3), wherein the outlet of the defluoridation treatment device (1) is connected to the inlet of the defluoridated wastewater main pipeline (8), characterized in that: The outlet end of the defluorination main drainage pipe (8) is also provided with a first branch pipe (9), a second branch pipe (10) and a third branch pipe (11). The outlet end of the first branch pipe (9) is connected to the defluorination treatment device (1), the outlet end of the second branch pipe (10) is connected to the inlet end of the desulfurization process unit (3), the outlet end of the desulfurization process unit (3) is connected to the defluorination treatment device (1), and the outlet end of the third branch pipe (11) is connected to the Parshall flume (2).

2. The recycling system for defluoridation wastewater and desulfurization process water as described in claim 1, characterized in that: A filter device (4) for removing suspended solids and trace impurities in the defluorination wastewater is also provided between the second branch pipe (10) and the desulfurization process unit (3). The inlet end of the filter device (4) is connected to the outlet end of the second branch pipe (10), and the outlet end of the filter device (4) is connected to the inlet end of the desulfurization process unit (3).

3. The recycling system for defluorination wastewater and desulfurization process water as described in claim 2, characterized in that: The filtration device (4) is a sedimentation tank equipped with a filter screen.

4. The recycling system for defluoridation wastewater and desulfurization process water as described in claim 2, characterized in that: A water quality adjustment device (5) for adjusting the pH of the defluorination wastewater is provided between the filter device (4) and the desulfurization process unit (3). The outlet of the filter device (4) is connected to the inlet of the water quality adjustment device (5), and the outlet of the water quality adjustment device (5) is connected to the inlet of the desulfurization process unit (3).

5. The recycling system for defluorination wastewater and desulfurization process water as described in claim 4, characterized in that: The water quality adjustment device (5) is a water tank equipped with a pH adjuster.

6. The recycling system for defluoridation wastewater and desulfurization process water as described in claim 1, characterized in that: A pretreatment device (6) for removing impurities from the desulfurization process wastewater is provided between the desulfurization process unit (3) and the defluorination treatment device (1). The outlet of the desulfurization process unit (3) is connected to the inlet of the pretreatment device (6), and the outlet of the pretreatment device (6) is connected to the defluorination treatment device (1).

7. The recycling system for defluoridation wastewater and desulfurization process water as described in claim 6, characterized in that: The pretreatment device (6) is a sedimentation tank equipped with a filter screen and a cleaning agent.

8. The recycling system for defluoridation wastewater and desulfurization process water as described in any one of claims 1 to 7, characterized in that: Manual valves (7) are installed on the first branch pipe (9), the second branch pipe (10) and the third branch pipe (11). Manual valves (7) are also installed on the outlet pipes of the desulfurization process unit (3), the filter device (4), the water quality adjustment device (5) and the pretreatment device (6).

Images