Desulfurization wastewater treatment device

Abstract

The utility model provides a desulfurization wastewater treatment device, which belongs to the technical field of desulfurization wastewater treatment and comprises a gypsum cyclone, a filtrate water tank, an overflow water tank and a mixed water tank, the gypsum cyclone is provided with an overflow groove and an underflow groove, and the underflow groove is communicated with a gypsum dehydrator; the filtrate water tank is communicated with the gypsum dehydrator; the overflow water tank is communicated with the overflow groove; a first confluence pipeline of the mixed water tank is communicated with the filtrate tank, a second confluence pipeline of the mixed water tank is communicated with the overflow water tank, and flow regulating valves are arranged on the first confluence pipeline and the second confluence pipeline. The overflow water tank is used for collecting overflow water of the gypsum cyclone, the filtrate water tank is used for collecting gypsum filtrate water, and the gypsum filtrate water and the overflow water are blended and mixed in the mixing water tank according to different proportions through the flow regulating valve, so that online regulation of the solid content of the desulfurization wastewater is realized. The desulfurization wastewater treatment device provided by the utility model solves the problem that the desulfurization wastewater in the prior art cannot give consideration to the desulfurization slurry impurity discharge amount and the reduction of the wastewater solid content at the same time.

Description

Technical Field

[0001] This utility model relates to the field of desulfurization wastewater treatment technology, and specifically to a desulfurization wastewater treatment device. Background Technology

[0002] Desulfurization wastewater is the most difficult wastewater to treat in coal-fired power plants. Traditional methods involve using multiple hydrocyclones to separate the gypsum slurry, discharging the separated solid particles as gypsum. The wastewater is then treated by the desulfurization wastewater system to meet discharge standards. High solids content in desulfurization wastewater is a major factor causing accelerated wear and tear on desulfurization wastewater system equipment, pipe blockages, and other equipment malfunctions. This makes continuous wastewater discharge difficult and affects the chloride ion and TDS balance of the desulfurization system.

[0003] In existing technologies, desulfurization wastewater is typically sourced solely from gypsum hydrocyclone overflow or gypsum filtrate. The advantages of using gypsum hydrocyclone overflow as a wastewater source include: no low-chloride ion content in the wastewater, small wastewater discharge volume, and effective removal of harmful impurities from the desulfurization slurry, ensuring the quality and health of the slurry. The disadvantages include a high solids content (7%–12%), leading to frequent clogging and shutdown of the wastewater hydrocyclone, blockage of the wastewater triplet tank, and excessively high chemical dosage. Furthermore, the solids content of the desulfurization wastewater cannot be adjusted online. The advantages of using gypsum filtrate as a source of desulfurization wastewater are: the solid content of the sulfur wastewater is low, only 3% to 6%, which will not cause frequent blockage and shutdown of the wastewater hydrocyclone or sludge buildup in the wastewater triple tank. The disadvantages are that during the gypsum dewatering process, wastewater with low chloride ion content, such as filter cloth washing water and filter cake washing water, will be mixed in, resulting in a higher wastewater discharge volume, a lower discharge of harmful impurities in the desulfurization slurry, and the inability to adjust the solid content of the desulfurization wastewater online.

[0004] However, neither of the above two methods allows for online adjustment of the solid content in desulfurization wastewater, thus failing to simultaneously achieve the goals of reducing the amount of impurities discharged from the desulfurization slurry and lowering the solid content of the wastewater. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the existing technology cannot simultaneously take into account the discharge of impurities in desulfurization slurry and reduce the solid content of wastewater, thereby providing a desulfurization wastewater treatment device.

[0006] To address the aforementioned technical problems, this utility model provides a desulfurization wastewater treatment device, comprising: a gypsum hydrocyclone, a filtrate tank, an overflow tank, and a mixing tank. The gypsum hydrocyclone has an overflow trough and a bottom flow trough, the bottom flow trough being connected to a gypsum dewatering machine. The filtrate tank is connected to the gypsum dewatering machine and is used to collect gypsum filtrate water. The overflow tank is connected to the overflow trough and is used to collect overflow water. The mixing tank is connected to a wastewater pipe network. The mixing tank is equipped with a first manifold and a second manifold. The first manifold is connected to the filtrate tank, and the second manifold is connected to the overflow tank. Both the first manifold and the second manifold are equipped with flow regulating valves.

[0007] During operation, the desulfurization slurry passes through the gypsum hydrocyclone. The overflow water from the hydrocyclone flows through an overflow trough into an overflow tank, while the underflow water from the hydrocyclone flows through an underflow trough into a gypsum dewatering machine. The gypsum filtrate produced by the dewatering machine enters a filtrate tank. The filtrate in the filtrate tank flows through a first manifold into a mixing tank, and the overflow water in the overflow tank flows through a second manifold into the mixing tank. A flow regulating valve ensures that the gypsum filtrate and overflow water are mixed in different proportions within the mixing tank. The system mixes and adjusts the solid content of desulfurization wastewater online before finally discharging it into the wastewater network. When the quality of the desulfurization absorption tower slurry declines, the wastewater discharge primarily consists of the overflow water from the gypsum hydrocyclone, supplemented by gypsum filtrate, with the main purpose of removing impurities from the slurry. When the quality of the desulfurization absorption tower slurry is normal, and provided the wastewater hydrocyclone remains unclogged, the wastewater discharge primarily consists of the gypsum filtrate, supplemented by the overflow water from the gypsum hydrocyclone, achieving a balance between removing impurities from the desulfurization slurry and reducing the solid content of the wastewater. This invention provides a desulfurization wastewater treatment device that solves the problem in existing technologies where the desulfurization wastewater treatment cannot simultaneously achieve both the removal of impurities from the desulfurization slurry and the reduction of the solid content in the wastewater.

[0008] Optionally, a filtrate pump is provided on the first manifold, and a filtrate regulating valve is installed at the outlet of the filtrate pump. With the above configuration, the filtrate pump can transport the gypsum filtrate water in the filtrate water tank to the mixing tank through the first manifold, and the flow rate of the gypsum filtrate water in the first manifold can be adjusted by the filtrate regulating valve.

[0009] Optionally, an overflow pump is installed on the second manifold, and an overflow regulating valve is installed at the outlet of the overflow pump. With the above configuration, the overflow pump can transport the overflow water in the overflow tank to the mixing tank through the second manifold, and the overflow regulating valve can adjust the flow rate of the overflow water in the second manifold.

[0010] Optionally, both the filtrate pump and the filtrate regulating valve have at least two sets arranged in parallel. This arrangement, with at least two sets of filtrate pumps and regulating valves arranged in parallel, enables redundant backup and improves system reliability.

[0011] Optionally, both the overflow pump and the overflow regulating valve have at least two sets arranged in parallel. This arrangement, with at least two sets of overflow pumps and overflow regulating valves arranged in parallel, enables redundant backup and improves system reliability.

[0012] Optionally, a water treatment unit is provided between the overflow tank and the gypsum hydrocyclone. Through this arrangement, the water treatment unit can remove harmful substances from the overflow water using physical, chemical, and biological methods, thereby purifying the water and reducing the environmental harm caused by desulfurization wastewater.

[0013] Optionally, a wastewater discharge pipe is installed on the mixing tank, and a desulfurization wastewater hydrocyclone is installed on the wastewater discharge pipe. The desulfurization wastewater hydrocyclone is used to connect to the wastewater network. With the above configuration, the desulfurization wastewater hydrocyclone can separate and classify the mixed wastewater and discharge it into the wastewater network.

[0014] Optionally, the filtrate tank, the overflow tank, and the mixing tank are all equipped with overflow pipes. With this configuration, when the liquid levels in the filtrate tank, the overflow tank, and the mixing tank are too high, overflow can be discharged through the overflow pipes to prevent backflow.

[0015] Optionally, the filtrate tank, the overflow tank, and the mixing tank are all equipped with drain pipes, and drain valves are installed on the drain pipes. With this configuration, when the filtrate tank, overflow tank, and mixing tank require maintenance or cleaning, the drain valves are opened, and the filtrate is discharged through the drain pipes. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of one embodiment of the desulfurization wastewater treatment device provided in this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Gypsum hydrocyclone; 2. Overflow tank; 3. Bottom flow tank; 4. Gypsum dewatering machine; 5. Filtrate tank; 6. Overflow tank; 7. Mixing tank; 8. First manifold; 9. Second manifold; 10. Filtrate pump; 11. Filtrate regulating valve; 12. Overflow pump; 13. Overflow regulating valve; 14. Water treatment unit; 15. Desulfurization wastewater hydrocyclone; 16. Overflow pipe; 17. Drain pipe; 18. Drain valve. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] This embodiment provides a structure for a desulfurization wastewater treatment device that can balance the discharge of impurities from desulfurization slurry with the reduction of solid content in wastewater, and is used to adjust the solid content of desulfurization wastewater online.

[0025] like Figure 1The diagram illustrates a specific implementation of a desulfurization wastewater treatment device provided in this embodiment, comprising: a gypsum hydrocyclone 1, a filtrate tank 5, an overflow tank 6, and a mixing tank 7. The gypsum hydrocyclone 1 has an overflow trough 2 and a bottom flow trough 3, with the bottom flow trough 3 connected to a gypsum dewatering machine 4. The filtrate tank 5 is connected to the gypsum dewatering machine 4 and is used to collect gypsum filtrate water. The overflow tank 6 is connected to the overflow trough 2 and is used to collect overflow water. The mixing tank 7 is connected to a wastewater pipe network. The mixing tank 7 is equipped with a first manifold 8 and a second manifold 9. The first manifold 8 is connected to the filtrate tank 5, and the second manifold 9 is connected to the overflow tank 6. Both the first manifold 8 and the second manifold 9 are equipped with flow regulating valves.

[0026] During operation, the desulfurization slurry passes through the gypsum hydrocyclone 1, and the overflow water from the gypsum hydrocyclone 1 flows through the overflow trough 2 into the overflow tank 6. The underflow water from the gypsum hydrocyclone 1 flows through the underflow trough 3 into the gypsum dewatering machine 4. The gypsum filtrate produced by the gypsum dewatering machine 4 enters the filtrate tank 5. The gypsum filtrate in the filtrate tank 5 flows through the first manifold 8 into the mixing tank 7. The overflow water in the overflow tank 6 flows through the second manifold 9 into the mixing tank 7, and then through the flow regulating valve... The gypsum filtrate and overflow water are mixed in different proportions in the mixing tank 7 to achieve online adjustment of the solid content of the desulfurization wastewater. When the quality of the slurry in the desulfurization absorption tower decreases, the discharge of desulfurization wastewater mainly consists of the overflow water from the gypsum hydrocyclone 1, supplemented by the gypsum filtrate, with the primary purpose of removing impurities from the slurry. When the quality of the slurry in the desulfurization absorption tower is normal, and provided that the wastewater hydrocyclone is not clogged, the discharge of desulfurization wastewater mainly consists of the gypsum filtrate, supplemented by the overflow water from the gypsum hydrocyclone 1. This achieves the goal of balancing the discharge of impurities from the desulfurization slurry and reducing the solid content of the wastewater. The desulfurization wastewater treatment device provided in this embodiment solves the problem in the prior art that the desulfurization wastewater cannot simultaneously achieve the goal of balancing the discharge of impurities from the desulfurization slurry and reducing the solid content of the wastewater.

[0027] It should be noted that, since the solid content of the two types of wastewater, gypsum filtrate and overflow water from gypsum hydrocyclone 1, is relatively fixed, the solid content data is first obtained through manual testing. Then, the flow rate is controlled by a flow regulating valve to reasonably mix the two types of wastewater to achieve a reasonable solid content in the wastewater, thereby taking into account both the amount of impurities discharged from the desulfurization slurry and the purpose of reducing the solid content of the wastewater.

[0028] like Figure 1As shown, in the desulfurization wastewater treatment device provided in this embodiment, a filtrate pump 10 is installed on the first manifold 8, and a filtrate regulating valve 11 is provided at the outlet of the filtrate pump 10. The filtrate pump 10 enables the gypsum filtrate water in the filtrate tank 5 to be transported to the mixing tank 7 through the first manifold 8, and the flow rate of the gypsum filtrate water in the first manifold 8 is adjusted by the filtrate regulating valve 11. Alternatively, as an alternative embodiment, the filtrate pump 10 can be omitted, and the filtrate tank 5 is located above the mixing tank 7, with the gypsum filtrate water flowing towards the mixing tank 7 in the first manifold 8 by gravity.

[0029] like Figure 1 As shown, in the desulfurization wastewater treatment device provided in this embodiment, an overflow pump 12 is installed on the second manifold 9, and an overflow regulating valve 13 is installed at the outlet of the overflow pump 12. The overflow pump 12 enables the overflow water in the overflow tank 6 to be transported to the mixing tank 7 through the second manifold 9, and the flow rate of the overflow water in the second manifold 9 is adjusted by the overflow regulating valve 13. Alternatively, as an alternative embodiment, the overflow pump 12 can be omitted, and the overflow tank 6 is located above the mixing tank 7, with the overflow water flowing towards the mixing tank 7 in the second manifold 9 by gravity.

[0030] like Figure 1 As shown, in the desulfurization wastewater treatment device provided in this embodiment, both the filtrate pump 10 and the filtrate regulating valve 11 have at least two sets arranged in parallel. The at least two sets of the filtrate pump 10 and the filtrate regulating valve 11 arranged in parallel enable redundant backup settings, improving system reliability. Specifically, there are two sets of the filtrate pump 10 and the filtrate regulating valve 11 arranged in parallel. Alternatively, as an alternative implementation, the filtrate pump 10 and the filtrate regulating valve 11 can also be provided as a single set.

[0031] like Figure 1 As shown, in the desulfurization wastewater treatment device provided in this embodiment, both the overflow pump 12 and the overflow regulating valve 13 have at least two sets arranged in parallel. The at least two sets of overflow pumps 12 and overflow regulating valves 13 arranged in parallel enable redundant backup settings, improving system reliability. Specifically, there are two sets of overflow pumps 12 and overflow regulating valves 13 arranged in parallel. Alternatively, as an alternative implementation, the overflow pumps 12 and overflow regulating valves 13 can also be arranged in a single set.

[0032] like Figure 1As shown, in the desulfurization wastewater treatment device provided in this embodiment, a water treatment unit 14 is provided between the overflow tank 6 and the gypsum hydrocyclone 1. The water treatment unit 14 can remove harmful substances from the overflow water through physical, chemical, and biological methods, thereby purifying the water quality and reducing the environmental harm of desulfurization wastewater. Specifically, the water treatment unit 14 is a three-unit desulfurization wastewater treatment tank, which includes a sedimentation unit, a neutralization unit, and an oxidation unit. The sedimentation unit adds a precipitant to precipitate suspended solids and some heavy metals in the wastewater, achieving the initial removal of impurities. The neutralization unit uses neutralizing agents such as lime milk to adjust the pH value of the wastewater to 9-9.7, reducing the corrosiveness of the wastewater and causing most heavy metals to precipitate in the form of hydroxides. The oxidation unit uses an oxidant to oxidize and decompose the organic matter in the wastewater, achieving the purification purpose. In addition, as an alternative implementation, the water treatment unit 14 can be located at the outlet of the mixing tank 7.

[0033] like Figure 1 As shown in the figure, in the desulfurization wastewater treatment device provided in this embodiment, a wastewater discharge pipeline is provided on the mixing tank 7, and a desulfurization wastewater hydrocyclone 15 is provided on the wastewater discharge pipeline. The desulfurization wastewater hydrocyclone 15 is used to connect to the wastewater pipe network. The desulfurization wastewater hydrocyclone 15 can separate and classify the mixed wastewater and discharge it to the wastewater pipe network.

[0034] like Figure 1 As shown in the embodiment, in the desulfurization wastewater treatment device, the filtrate tank 5, the overflow tank 6, and the mixing tank 7 are all equipped with overflow pipes 16. When the liquid level in the filtrate tank 5, the overflow tank 6, and the mixing tank 7 is too high, overflow can be discharged through the overflow pipes 16 to prevent backflow. Alternatively, as an alternative implementation, the overflow pipes 16 can be omitted, and liquid level monitoring devices can be installed in the filtrate tank 5, the overflow tank 6, and the mixing tank 7. When the maximum liquid level is reached, the liquid level can be manually lowered by draining water.

[0035] like Figure 1 As shown, in the desulfurization wastewater treatment device provided in this embodiment, drain pipes 17 are provided on the filtrate tank 5, the overflow tank 6, and the mixing tank 7, and drain valves 18 are provided on the drain pipes 17. When the filtrate tank 5, the overflow tank 6, and the mixing tank 7 need maintenance and cleaning, the drain valves 18 are opened, and the wastewater is discharged through the drain pipes 17. Alternatively, as an alternative implementation, drain pipes 17 may only be provided on the mixing tank 7.

[0036] How to use:

[0037] like Figure 1As shown in this embodiment, the desulfurization wastewater treatment device, during use, after the desulfurization slurry passes through the gypsum hydrocyclone 1, the overflow water from the gypsum hydrocyclone 1 enters the overflow tank 6 through the overflow trough 2, and the underflow water from the gypsum hydrocyclone 1 enters the gypsum dewatering machine 4 through the underflow trough 3. The gypsum filtrate water produced by the gypsum dewatering machine 4 enters the filtrate tank 5, and the gypsum filtrate water in the filtrate tank 5 enters the mixing tank 7 through the first manifold 8. The overflow water in the overflow tank 6 enters the mixing tank 7 through the second manifold 9. The flow regulating valve allows gypsum filtrate and overflow water to be mixed in different proportions in the mixing tank 7, enabling online adjustment of the solid content in the desulfurization wastewater. When the quality of the desulfurization absorption tower slurry declines, the desulfurization wastewater discharge is mainly from the overflow water of the gypsum hydrocyclone 1, supplemented by gypsum filtrate, with the primary purpose of removing slurry impurities. When the quality of the desulfurization absorption tower slurry is normal, and provided that the wastewater hydrocyclone is not clogged, the desulfurization wastewater discharge is mainly from the gypsum filtrate, supplemented by the overflow water of the gypsum hydrocyclone 1, thus achieving a balance between the discharge of desulfurization slurry impurities and the reduction of wastewater solid content.

[0038] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A desulfurization wastewater treatment device, characterized in that, include: The gypsum hydrocyclone (1) has an overflow trough (2) and an underflow trough (3), wherein the underflow trough (3) is connected to a gypsum dewatering machine (4); The filtrate tank (5) is connected to the gypsum dehydrator (4) and is used to collect gypsum filtrate water. An overflow tank (6) is connected to the overflow trough (2), and the overflow tank (6) is used to collect overflow water; A mixing tank (7) is used to connect to the wastewater pipe network. The mixing tank (7) is equipped with a first manifold (8) and a second manifold (9). The first manifold (8) is connected to the filtrate tank (5), and the second manifold (9) is connected to the overflow tank (6). Both the first manifold (8) and the second manifold (9) are equipped with flow regulating valves.

2. The desulfurization wastewater treatment device according to claim 1, characterized in that, The first manifold (8) has a filtrate pump (10), and a filtrate regulating valve (11) is provided at the outlet of the filtrate pump (10).

3. The desulfurization wastewater treatment device according to claim 2, characterized in that, An overflow pump (12) is provided on the second manifold (9), and an overflow regulating valve (13) is provided at the outlet of the overflow pump (12).

4. The desulfurization wastewater treatment device according to claim 2, characterized in that, The filtrate pump (10) and the filtrate regulating valve (11) each have at least two sets arranged in parallel.

5. The desulfurization wastewater treatment device according to claim 3, characterized in that, Both the overflow pump (12) and the overflow regulating valve (13) have at least two sets arranged in parallel.

6. The desulfurization wastewater treatment device according to claim 1, characterized in that, A water treatment unit (14) is provided between the overflow tank (6) and the gypsum hydrocyclone (1).

7. The desulfurization wastewater treatment device according to claim 1, characterized in that, The mixing tank (7) is equipped with a wastewater discharge pipeline, and a desulfurization wastewater hydrocyclone (15) is installed on the wastewater discharge pipeline. The desulfurization wastewater hydrocyclone (15) is used to connect to the wastewater network.

8. The desulfurization wastewater treatment device according to any one of claims 1-7, characterized in that, The filtrate tank (5), the overflow tank (6), and the mixing tank (7) are all equipped with overflow pipes (16).

9. The desulfurization wastewater treatment device according to any one of claims 1-7, characterized in that, The filtrate tank (5), the overflow tank (6) and the mixing tank (7) are all equipped with drain pipes (17), and drain valves (18) are installed on the drain pipes (17).

Images