Desulfurization wastewater treatment system
By setting up regulating and chemical dosing units in the desulfurization system, and utilizing pH adjustment and flocculation treatment, the problems of high solid content and high turbidity in wastewater after treatment were solved, achieving efficient wastewater treatment and recycling, and reducing equipment corrosion risks and production costs.
Patent Information
- Application Number
- CN202422846952.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2034-11-21
AI Technical Summary
In existing desulfurization systems, the wastewater has a high solids content and high turbidity after treatment, which leads to equipment corrosion and increased production costs, and the wastewater cannot be effectively recycled.
The desulfurization system is equipped with a regulating unit, a chemical dosing unit, and a sedimentation tank. The wastewater generated by the steam-water separator is subjected to pH adjustment and flocculation treatment. The clear liquid after sedimentation is recycled to reduce solids content and turbidity.
It achieves efficient wastewater treatment, reduces equipment corrosion risks and production costs, and improves the recycling rate of wastewater.
Smart Images
Figure CN223936353U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of desulfurization technology, specifically relating to a desulfurization wastewater treatment system. Background Technology
[0002] When the desulfurization system is operating normally, the chloride ion concentration in the system is usually below 20 g / L. However, after the desulfurization system has been running for a long time, water vapor in the system is carried away by the flue gas, and chloride ions gradually accumulate. When the chloride ion concentration in the system exceeds the normal value, the chloride ions will corrode the equipment in the desulfurization system, resulting in a reduction in equipment life and affecting the normal operation of the desulfurization system.
[0003] In traditional desulfurization wastewater treatment systems, gypsum slurry from the desulfurization system enters a gypsum hydrocyclone via a gypsum discharge pump. The supernatant overflowing after treatment is returned to the desulfurization system, while the remainder enters the wastewater treatment system. The wastewater treated by the wastewater treatment system has a high solids content and high turbidity, making it unusable for other systems in the plant area. Utility Model Content
[0004] This utility model provides a desulfurization wastewater treatment system, which aims to solve the technical problems of high solid content and high turbidity in wastewater after treatment in existing desulfurization systems.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a desulfurization wastewater treatment system, which is installed after the steam-water separator in the dehydration unit of the desulfurization system, and includes:
[0006] The regulating unit includes a regulating tank and an inlet pipe and an acid-base regulating pipe extending into the regulating tank, wherein the inlet pipe is connected to the steam-water separator;
[0007] The dosing unit includes a dosing tank connected to the regulating tank, and a dosing pipe extending into the dosing tank;
[0008] A sedimentation tank is connected to the dosing tank, and an overflow trough is provided on the top of the sedimentation tank;
[0009] The wastewater generated by the steam-water separator enters the regulating tank and its pH is adjusted by the acid-base regulating pipe. Then it flows into the dosing tank and is flocculated after being added to the dosing tank through the dosing pipe. The flocculated water then flows into the sedimentation tank. The clear liquid on the upper layer of the sedimentation tank overflows into the overflow trough and is discharged to the outside.
[0010] In one possible implementation, both the regulating tank and the dosing tank are equipped with a stirring device.
[0011] In one possible implementation, the stirring device includes:
[0012] Drive mechanism;
[0013] The stirring shaft is connected to the drive mechanism via a transmission connection.
[0014] The blade assembly is fixed to the outer periphery of the stirring shaft.
[0015] In one possible implementation, the blade assembly includes:
[0016] A connecting plate is fixed to the bottom end of the stirring shaft, and the surface of the connecting plate forms an acute angle with the axial direction of the stirring shaft;
[0017] The top of the first stirring plate is connected to the highest side of the connecting plate;
[0018] The second stirring plate is connected at its bottom to the lowest side of the connecting plate. The surface of the second stirring plate is parallel to the surface of the first stirring plate and parallel to the axial direction of the stirring shaft.
[0019] In one possible implementation, both the acid-base regulating tube and the dosing tube are equipped with flow meters.
[0020] In one possible implementation, a first liquid supply pipe is connected between the regulating tank and the dosing tank, with the inlet end of the first liquid supply pipe located on the top outer periphery of the regulating tank and the outlet end of the first liquid supply pipe extending from above the dosing tank.
[0021] In one possible implementation, a second liquid supply pipe is connected between the dosing tank and the sedimentation tank. The inlet end of the second liquid supply pipe is located at the bottom outer periphery of the dosing tank, and the outlet end of the second liquid supply pipe extends from above the sedimentation tank.
[0022] In one possible implementation, a feed pump is provided on the second supply pipe.
[0023] In one possible implementation, the bottom of the sedimentation tank is provided with an external discharge pipe connected to the dewatering unit, and an external discharge pump is provided on the external discharge pipe.
[0024] In one possible implementation, the desulfurization wastewater treatment system further includes a buffer pool connected to the overflow tank.
[0025] Compared with the prior art, the solution shown in this application includes a desulfurization tower, a gypsum hydrocyclone, and a dewatering unit. The gypsum slurry produced by the desulfurization system enters the gypsum hydrocyclone through a gypsum discharge pump. Traditionally, the wastewater produced by the gypsum hydrocyclone is treated. This application treats the wastewater produced by the steam-water separator in the dewatering unit. Since the dewatering unit has a filtration function, the wastewater discharged from the steam-water separator has a lower solids content and reduced turbidity after treatment. During wastewater treatment, a pH adjusting solution is first introduced to adjust the acidity and alkalinity of the wastewater. Then, chemicals are added to cause impurities in the wastewater to flocculate into precipitates. The flocculated precipitates and water both enter a sedimentation tank for sedimentation. The precipitates sink to the bottom of the sedimentation tank, and the clear liquid on the upper layer overflows into an overflow tank. The clear liquid in the overflow tank is the treated clear liquid, which is also directly discharged to the outside for use by other systems in the plant. This method has higher treatment efficiency and realizes the recycling of wastewater, reducing production costs. Attached Figure Description
[0026] Figure 1 A schematic diagram of the working process of the desulfurization wastewater treatment system provided in this embodiment of the utility model;
[0027] Figure 2 This is a schematic diagram of the main structure of the regulating tank used in an embodiment of this utility model.
[0028] Explanation of reference numerals in the attached figures:
[0029] 10-Desulfurization tower; 11-Gypsum hydrocyclone; 12-Dehydration unit; 13-Steam-water separator;
[0030] 20-Regulating unit; 21-Regulating tank; 22-Acid-base regulating pipe; 23-Water inlet pipe;
[0031] 30 - Dosing unit; 31 - Dosing tank; 32 - Dosing pipe;
[0032] 40 - Sedimentation tank; 41 - Overflow trough; 42 - External discharge pipe; 43 - External discharge pump;
[0033] 51-Drive mechanism; 52-Stirring shaft; 53-Blade assembly; 531-Connecting plate; 532-First stirring plate; 533-Second stirring plate;
[0034] 60-Flow meter;
[0035] 70 - First supply tube;
[0036] 80 - Second liquid supply pipe; 81 - Feed pump;
[0037] 90 - Cache pool. Detailed Implementation
[0038] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0039] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.
[0040] Unless otherwise expressly defined, the directional terms used in the claims, description, and accompanying drawings of this utility model, such as "upper," "lower," "top," "bottom," "front," "rear," "inner," "outer," "center," "lateral," "longitudinal," "horizontal," "vertical," "left," "right," "clockwise," "counterclockwise," "high," and "low," to indicate orientation or positional relationships are based on the orientation and positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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 limiting the specific protection scope of this utility model.
[0041] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.
[0042] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".
[0043] Please refer to the following: Figures 1 to 2 The desulfurization wastewater treatment system provided by this utility model will now be described. The desulfurization wastewater treatment system is located after the steam-water separator 13 in the dehydration unit 12 of the desulfurization system. It includes an adjustment unit 20, a dosing unit 30, and a sedimentation tank 40. The adjustment unit 20 includes an adjustment tank 21, an inlet pipe 23 extending into the adjustment tank 21, and an acid-base adjustment pipe 22. The inlet pipe 23 is connected to the steam-water separator 13. The dosing unit 30 includes a dosing tank 31 connected to the adjustment tank 21, and a dosing pipe 32 extending into the dosing tank 31. The sedimentation tank 40 is connected to the dosing tank 31, and an overflow trough 41 is provided at the top of the sedimentation tank 40.
[0044] The wastewater generated by the steam-water separator 13 enters the regulating tank 21 and then the acid-base regulating pipe 22 is used to adjust the acid-base balance. It then flows into the dosing tank 31 and is dosed with chemicals through the dosing pipe 32. After flocculation, the wastewater flows into the sedimentation tank 40. The clear liquid on the upper layer of the sedimentation tank 40 overflows into the overflow trough 41 and the clear liquid in the overflow trough 41 is discharged to the outside.
[0045] The desulfurization wastewater treatment system provided in this embodiment differs from existing technologies. Existing desulfurization systems include a desulfurization tower 10, a gypsum hydrocyclone 11, and a dewatering unit 12. The gypsum slurry produced by the desulfurization system enters the gypsum hydrocyclone 11 via a gypsum discharge pump. Traditionally, the wastewater generated by the gypsum hydrocyclone 11 is treated. This application treats the wastewater generated by the steam-water separator 13 in the dewatering unit 12. Since the dewatering unit 12 has a filtration function, the wastewater discharged from the steam-water separator 13, after treatment, contains... The solid content is low and the turbidity is reduced. During wastewater treatment, a pH adjusting solution is first introduced to adjust the acidity and alkalinity of the wastewater. Then, chemicals are added to cause impurities in the wastewater to flocculate into precipitates. The flocculated precipitates and water both enter the sedimentation tank 40 for further sedimentation. The precipitates will sink to the bottom of the sedimentation tank 40, and the clear liquid on the upper layer will overflow into the overflow tank 41. The clear liquid in the overflow tank 41 is the treated clear liquid, which is also directly discharged to the outside for use by other systems in the plant area. The treatment efficiency is higher, and the wastewater is recycled, reducing production costs.
[0046] In some embodiments, an improved implementation of the regulating tank 21 and the dosing tank 31 can be as follows: Figures 1 to 2 The structure shown. See also Figures 1 to 2 Both the equalization tank 21 and the dosing tank 31 are equipped with stirring devices. The equalization tank 21 needs to add acid-base adjusting solution to adjust the pH value of the wastewater, while the dosing tank 31 needs to add flocculant to flocculate impurities in the wastewater. By adding stirring devices to the equalization tank 21 and the dosing tank 31, the wastewater can react quickly with the added chemicals, shorten the reaction time, and improve the wastewater treatment efficiency.
[0047] Optionally, the stirring device can be a stirring rod, which is manually operated to stir the mixture in the regulating tank 21 and the dosing tank 31.
[0048] In some embodiments, a specific implementation of the above-described stirring device may employ, as follows: Figure 2 The structure shown. See also Figure 2The stirring device includes a drive mechanism 51, a stirring shaft 52, and a blade assembly 53. The stirring shaft 52 is connected to the drive mechanism 51 via a transmission connection. The blade assembly 53 is fixed to the outer periphery of the stirring shaft 52. The drive mechanism 51 can be a motor, in which case the stirring shaft 52 is directly and fixedly connected to the output shaft of the motor. The drive mechanism 51 is located above the regulating tank 21 and the dosing tank 31. The motor drives the stirring shaft 52 to rotate, which can realize the stirring shaft 52 rotating in one direction or reciprocating back and forth, making the stirring method more diverse. The rotation of the stirring shaft 52 driven by the drive mechanism 51 can replace manual labor and save labor.
[0049] In some embodiments, a specific implementation of the blade assembly 53 may employ, as follows: Figure 2 The structure shown. See also Figure 2 The blade assembly 53 includes a connecting plate 531, a first stirring plate 532, and a second stirring plate 533. The connecting plate 531 is fixed to the bottom end of the stirring shaft 52, and the surface of the connecting plate 531 forms an acute angle with the axial direction of the stirring shaft 52. The top of the first stirring plate 532 is connected to the highest side of the connecting plate 531. The bottom of the second stirring plate 533 is connected to the lowest side of the connecting plate 531, and the surface of the second stirring plate 533 is parallel to the surface of the first stirring plate 532 and parallel to the axial direction of the stirring shaft 52. Viewed from the side, the connecting plate 531, the first stirring plate 532, and the second stirring plate 533 form a Z-shape. When the stirring shaft 52 drives the blade assembly 53 to rotate, it can generate not only circumferential vortices but also axial vortices, which is beneficial for mixing wastewater and chemicals and improving treatment efficiency.
[0050] In some embodiments, an improved implementation of the acid-base adjustment tube 22 and the dosing tube 32 can be as follows: Figure 1 The structure shown. See also Figure 1 Both the acid-base regulating pipe 22 and the dosing pipe 32 are equipped with flow meters 60. By setting the flow meters 60, it is convenient to control the dosing amount. The dosing amount can be adjusted according to the actual wastewater volume in the regulating tank 21 and the dosing tank 31, which can avoid waste of chemicals and facilitate pH adjustment and flocculation treatment of wastewater, thus saving costs.
[0051] In some embodiments, an improved implementation of the above-described desulfurization wastewater treatment system may employ, as follows: Figure 1 The structure shown. See also Figure 1 A first liquid supply pipe 70 is connected between the regulating tank 21 and the dosing tank 31. The inlet end of the first liquid supply pipe 70 is located on the top outer periphery of the regulating tank 21, and the outlet end of the first liquid supply pipe 70 extends from the top of the dosing tank 31.
[0052] The steam-water separator 13 continuously supplies wastewater to the regulating tank 21, keeping the wastewater at the same level in the regulating tank 21. Then, the first liquid supply pipe 70 draws the wastewater from the upper layer of the regulating tank 21, which allows the residues originally contained in the wastewater to remain at the bottom of the regulating tank 21, thereby reducing the solid content of the treated wastewater.
[0053] Specifically, in addition to the flow meter 60 installed on the dosing pipe 32, a flow meter 60 can also be installed on the first liquid supply pipe 70. The amount of wastewater entering the dosing tank 31 can be calculated by the flow meter 60 on the first liquid supply pipe 70, so as to observe the flow rate of flocculant on the dosing pipe 32 and correspond it with the amount of wastewater in the dosing tank 31, thereby saving the amount of chemicals used while ensuring the flocculation effect of the wastewater.
[0054] In some embodiments, an improved implementation of the above-described desulfurization wastewater treatment system may employ, as follows: Figure 1 The structure shown. See also Figure 1 A second liquid supply pipe 80 connects the dosing tank 31 and the sedimentation tank 40. The inlet end of the second liquid supply pipe 80 is located at the bottom outer periphery of the dosing tank 31, and the outlet end of the second liquid supply pipe 80 extends from the top of the sedimentation tank 40. The second liquid supply pipe 80 draws flocculated wastewater from the bottom of the dosing tank 31, which can completely remove the flocculated impurities and wastewater, making it convenient for the next batch of wastewater to enter the dosing tank 31 for flocculation treatment.
[0055] Specifically, a feed pump 81 is provided on the second liquid supply pipe 80. The feed pump 81 provides power to the second liquid supply pipe 80, preventing the second liquid supply pipe 80 from being blocked when the sediment flows in the second liquid supply pipe 80, and the feed pump 81 realizes the extraction of sediment and wastewater in the dosing tank 31, which is more efficient.
[0056] In some embodiments, an improved implementation of the sedimentation tank 40 may employ, as follows: Figure 1 The structure shown. See also Figure 1 The bottom of the sedimentation tank 40 is equipped with an external discharge pipe 42 that connects to the dewatering unit 12, and an external discharge pump 43 is installed on the external discharge pipe 42. The clear liquid overflowing from the top of the sedimentation tank 40 is discharged for use by other systems in the plant area, while the sediment at the bottom flows back to the dewatering unit 12 through the external discharge pipe 42. The dewatering unit 12 processes the sediment again to generate wastewater that can be treated and then used by other systems. This cycle process can reduce costs.
[0057] In some embodiments, an improved implementation of the above-described desulfurization wastewater treatment system may employ, as follows: Figure 1 The structure shown. See also Figure 1The desulfurization wastewater treatment system also includes a buffer tank 82 connected to the overflow tank 41. The clear liquid in the overflow tank 41 can first flow into the buffer tank 82 for storage. When other systems in the plant need water, the water in the buffer tank 82 can be pumped out, making it more convenient to use and not affecting the continuous use of the overflow tank 41.
[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements 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 desulfurization wastewater treatment system, characterized in that, The sequence following the steam-water separator in the dehydration unit of the desulfurization system includes: The regulating unit includes a regulating tank and an inlet pipe and an acid-base regulating pipe extending into the regulating tank, wherein the inlet pipe is connected to the steam-water separator; The dosing unit includes a dosing tank connected to the regulating tank, and a dosing pipe extending into the dosing tank; A sedimentation tank is connected to the dosing tank, and an overflow trough is provided on the top of the sedimentation tank; The wastewater generated by the steam-water separator enters the regulating tank and its pH is adjusted by the acid-base regulating pipe. Then it flows into the dosing tank and is flocculated after being added to the dosing tank through the dosing pipe. The flocculated water then flows into the sedimentation tank. The clear liquid on the upper layer of the sedimentation tank overflows into the overflow trough and is discharged to the outside. Both the regulating tank and the dosing tank are equipped with a stirring device; The stirring device includes: Drive mechanism; The stirring shaft is connected to the drive mechanism via a transmission connection. The blade assembly is fixed to the outer periphery of the stirring shaft; The blade assembly includes: A connecting plate is fixed to the bottom end of the stirring shaft, and the surface of the connecting plate forms an acute angle with the axial direction of the stirring shaft; The top of the first stirring plate is connected to the highest side of the connecting plate; The second stirring plate is connected at its bottom to the lowest side of the connecting plate. The surface of the second stirring plate is parallel to the surface of the first stirring plate and parallel to the axial direction of the stirring shaft.
2. The desulfurization wastewater treatment system as described in claim 1, characterized in that, Both the acid-base adjustment tube and the dosing tube are equipped with flow meters.
3. The desulfurization wastewater treatment system as described in claim 1, characterized in that, A first liquid supply pipe is connected between the regulating tank and the dosing tank. The inlet end of the first liquid supply pipe is located on the top outer periphery of the regulating tank, and the outlet end of the first liquid supply pipe extends from above the dosing tank.
4. The desulfurization wastewater treatment system as described in claim 1, characterized in that, A second liquid supply pipe is connected between the dosing tank and the sedimentation tank. The inlet end of the second liquid supply pipe is located on the outer periphery of the bottom of the dosing tank, and the outlet end of the second liquid supply pipe extends from the top of the sedimentation tank.
5. The desulfurization wastewater treatment system as described in claim 4, characterized in that, The second liquid supply pipe is equipped with a feed pump.
6. The desulfurization wastewater treatment system as described in claim 1, characterized in that, The bottom of the sedimentation tank is provided with an external discharge pipe that is connected to the dewatering unit, and an external discharge pump is provided on the external discharge pipe.
7. The desulfurization wastewater treatment system as described in claim 1, characterized in that, The desulfurization wastewater treatment system also includes a buffer pool connected to the overflow tank.