Atomization treatment system for high-concentration desulfurization wastewater
By combining a wastewater hydrocyclone, extraction equipment, and atomizing tower with a denitrification reactor, the problem of high cost and complex system in zero-discharge treatment of desulfurization wastewater is solved, achieving efficient and low-cost chloride ion removal and equipment protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-27
AI Technical Summary
Existing zero-discharge treatment processes for desulfurization wastewater are characterized by high operating costs, large footprint, and complex systems. Furthermore, traditional treatment processes cannot effectively remove chloride ions, leading to equipment corrosion and affecting the efficiency of the desulfurization process.
A combined system of wastewater hydrocyclone, extraction equipment, atomization tower and denitrification reactor is adopted to treat high-concentration desulfurization wastewater through extraction and atomization, and to achieve evaporation and crystallization separation by combining the high-temperature flue gas of the existing denitrification reactor in the thermal power plant, which simplifies the process structure and reduces operating costs.
It achieves zero discharge of desulfurization wastewater, reduces system construction and operation costs, reduces equipment corrosion, improves treatment efficiency, and simplifies the maintenance process.
Smart Images
Figure CN224047183U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to wastewater treatment technical field, a kind of for high concentration desulfurization wastewater atomization treatment device. BACKGROUND
[0002] The wastewater generated in the process of flue gas desulfurization (limestone / gypsum method) of thermal power plant is from the discharge water of absorption tower. In order to maintain the material balance of slurry circulating system of desulfurization device, prevent the soluble part of flue gas, i.e. chlorine concentration from exceeding the specified value, and ensure the quality of gypsum, a certain amount of wastewater must be discharged from the system. The wastewater is mainly discharged through the outlet water of wastewater cyclone, washing water and cleaning system in gypsum dehydration process. The concentration of chloride ions in desulfurization wastewater slurry exceeds 20,000 mg / L. The traditional "three combined box" treatment process of desulfurization wastewater only removes suspended solids, turbidity and heavy metals, realizes the standard of suspended solids and heavy metals, but has no removal effect on chloride ions. In order to reduce the impact of wastewater discharge on the environment, corresponding technical measures need to be taken to realize true zero discharge and completely avoid the harm to the ecological environment.
[0003] At present, the zero discharge treatment process of desulfurization wastewater mainly includes pretreatment + thermal method / membrane method + evaporation crystallization technology, flue evaporation drying technology, etc. However, these treatment processes have problems such as high operation cost, large occupied area, and complex system. Therefore, the main problem at present is how to improve the zero discharge of desulfurization wastewater, reduce the construction cost and operation cost of desulfurization wastewater zero discharge system, and at the same time, reduce the corrosion of high-concentration desulfurization wastewater on equipment and the impact on the efficiency of desulfurization process. CONTENT OF THE UTILITY MODEL
[0004] To solve the above problems, the utility model provides a kind of for high concentration desulfurization wastewater atomization treatment system.
[0005] The utility model aims to realize in the following way: a kind of for high concentration desulfurization wastewater atomization treatment system, including wastewater cyclone 1, wastewater cyclone 1 is connected wastewater buffer tank 2 by pipeline, wastewater buffer tank 2 is connected first wastewater pump 3 input end by pipeline, first wastewater pump 3 output end is connected first extraction equipment 4 by pipeline, first extraction equipment 4 is connected second wastewater pump 7 input end by pipeline, second wastewater pump 7 output end is connected second extraction equipment 8 by pipeline,
[0006] It further includes atomization tower 14, atomization mechanism is arranged in the atomization tower 14, atomization mechanism connects second extraction equipment 8, atomization tower 14 is connected the flue gas outlet of denitration reactor 15 by pipeline, the ash hopper of funnel shape is arranged at the bottom of atomization tower 14, conveying system is arranged at the bottom of ash hopper, and the top of atomization tower 14 is opened.
[0007] Further, the second extraction device 8 is connected with the input end of the third wastewater pump 11 through a pipeline, the output end of the third wastewater pump 11 is connected with the water storage tank 12 through a pipeline, the water storage tank 12 is connected with the input end of the spray water pump 13 through a pipeline, and the output end of the spray water pump 13 is connected with the atomization mechanism through a pipeline.
[0008] Further, the rotating speed of the atomization disc is 10000 rpm-16000 rpm, the diameter of the atomization disc is 200 mm-250 mm, and the output end width of the atomization disc is 10 μm-60 μm.
[0009] Further, the stirring devices are arranged in the wastewater buffer tank 2 and the water storage tank 12 respectively.
[0010] Further, the flue gas outlet of the denitration reactor 15 is connected with the top of the atomization tower 14 through a pipeline, and the middle part of the atomization tower 14 is connected with the electric dust collector 16 through a pipeline.
[0011] Further, the first extraction device 4 is connected with the output end of the first metering pump 6 through a pipeline, the input end of the first metering pump 6 is connected with the first metering tank 5 through a pipeline, and the extraction liquid is arranged in the first metering tank 5; the second extraction device 8 is connected with the output end of the second metering pump 10 through a pipeline, the input end of the second metering pump 10 is connected with the second metering tank 9 through a pipeline, and the back extraction liquid is arranged in the second metering tank 9.
[0012] Compared with the prior art, the desulfurization wastewater is only subjected to extraction treatment, then is atomized and combined with the high-temperature flue gas of the denitration reactor of the thermal power plant to realize evaporation crystallization separation, and the traditional "three-tank" neutralization, flocculation and sedimentation process system is simple in structure, convenient in operation and maintenance, and low in operation cost. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 is a structural schematic view of a high-concentration desulfurization wastewater atomization treatment system.
[0014] Among them, the wastewater cyclone 1, the wastewater buffer tank 2, the first wastewater pump 3, the first extraction device 4, the first metering tank 5, the first metering pump 6, the second wastewater pump 7, the second extraction device 8, the second metering tank 9, the second metering pump 10, the third wastewater pump 11, the water storage tank 12, the spray water pump 13, the atomization tower 14, the denitration reactor 15 and the electric dust collector 16. DETAILED DESCRIPTION
[0015] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.
[0016] In the present application, unless otherwise explicitly specified and limited, the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are the directions or positional relationships shown based on the drawings, and are merely for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0017] As shown in the accompanying drawings, Figure 1 A high-concentration desulfurization wastewater atomization treatment system comprises a wastewater cyclone 1, the wastewater cyclone 1 is connected with a wastewater buffer tank 2 through a pipeline, the wastewater buffer tank 2 is a common tank body, the wastewater buffer tank 2 is connected with an input end of a first wastewater pump 3 through a pipeline, an output end of the first wastewater pump 3 is connected with a first extraction device 4 through a pipeline, the first extraction device 4 is connected with an input end of a second wastewater pump 7 through a pipeline, an output end of the second wastewater pump 7 is connected with a second extraction device 8 through a pipeline,
[0018] The first extraction device 4 and the second extraction device 8 are both extraction devices in the prior art, and are devices and connecting structures used in the desulfurization wastewater dechlorination process in the prior art, and the present application does not involve improvements to the devices themselves. In detail, the first extraction device 4 is connected with an output end of a first metering pump 6 through a pipeline, an input end of the first metering pump 6 is connected with a first metering tank 5 through a pipeline, and an extraction liquid is arranged in the first metering tank 5; the second extraction device 8 is connected with an output end of a second metering pump 10 through a pipeline, an input end of the second metering pump 10 is connected with a second metering tank 9 through a pipeline, and a back extraction liquid is arranged in the second metering tank 9.
[0019] Preferably, the pulse screen plate tower is used as the extraction equipment, and the organic amine is selected as the extractant. After the extractant is fully reacted in the first extraction equipment 4, the dechlorinated desulfurization wastewater can be used as the dilution water of the reagent or the desulfurization process water and other makeup water systems for recycling. The saturated organic phase enters the second extraction equipment 8 through the second wastewater pump 7. The second metering tank 9 adds the stripping agent to the second extraction equipment 8 through the second metering pump 10. The ammonia / ammonium chloride mixed solution can be selected as the stripping agent. After full reaction, the concentration of chloride ions is reduced, but the calcium ions, sodium ions, magnesium ions and sulfate ions in the wastewater are still very high.
[0020] Further, the atomizing tower 14 is further provided with an atomizing mechanism, the atomizing mechanism is connected with the second extraction equipment 8, the atomizing tower 14 is connected with the flue gas outlet of the denitration reactor 15 through a pipeline, the denitration reactor 15 is a prior art, which is a device for converting nitrogen oxides in the flue gas of a coal-fired power plant into nitrogen and water vapor by using a chemical method, and the device exists in the thermal power plant, so it does not need to be additionally arranged in practice, and only needs to be connected with the existing device. The bottom of the atomizing tower 14 is a funnel-shaped ash hopper, a conveying system is arranged at the bottom of the ash hopper, the conveying system is preferably a belt conveyor, one end of the belt conveyor is used for receiving the ash hopper below, the other end of the belt conveyor is connected to an ash storage, and the top of the atomizing tower 14 is open.
[0021] Further, the second extraction equipment 8 is connected with the input end of the third wastewater pump 11 through a pipeline, the output end of the third wastewater pump 11 is connected with the water storage tank 12 through a pipeline, the water storage tank 12 is used for storing the wastewater after the extraction process, does not affect the normal extraction process, the water storage tank 12 is connected with the input end of the spray water pump 13 through a pipeline, the output end of the spray water pump 13 is connected with the atomizing mechanism through a pipeline, the atomizing mechanism comprises a variable frequency motor, the variable frequency motor is fixed in the atomizing tower 14, and is preferably fixed at the top end of the atomizing tower 14, the output end of the variable frequency motor is fixedly connected with an atomizing disc, the atomizing disc is a prior art, comprising an input end and an output end comprising a plurality of fine channels, for dispersing and refining the liquid, and the input end of the atomizing disc is connected with the output end of the spray water pump 13 through a pipeline.
[0022] Further, the atomizing disc is controlled by the variable frequency motor to rotate at a speed of 10,000 rpm to 16,000 rpm, the atomizing disc has a diameter of 200 mm to 250 mm, the width of the output end of the atomizing disc is 10 μm to 60 μm, and the material is preferably hastelloy.
[0023] Further, the wastewater buffer tank 2 and the water storage tank 12 are respectively provided with agitators, preferably top-entry agitators, the shaft and impeller are preferably made of 2205 stainless steel, and the motor power is preferably 7.5 KW; and a PH meter is arranged in the wastewater buffer tank 2 and the water storage tank 12 respectively to detect the pH of the wastewater.
[0024] Further, the flue gas outlet of the denitration reactor 15 is connected to the top of the atomization tower 14 by a pipeline, and preferably opens downward at the top of the atomization tower 14 to spray the flue gas, so that the high-temperature flue gas and the waste water both enter the atomization tower from the top of the tower; the middle side of the atomization tower 14 is connected to an electric dust collector 16 by a pipeline, the electric dust collector 16 is a prior art and is a necessary matching equipment of the thermal power plant, and its function is to remove the particulate smoke in the flue gas discharged by the coal-fired or oil-fired boiler, thereby greatly reducing the amount of smoke discharged into the atmosphere.
[0025] The working principle of the utility model is as follows: the waste water cyclone 1 of the desulfurization system enters the waste water buffer tank 2 with high concentration overflow slurry Cl- concentration greater than 20000mg / L, and is sent to the first extraction equipment 4 through the first waste water pump 3, the first metering tank 5 adds extractant into the first extraction equipment 4 through the first metering pump 6, after sufficient reaction, the desulfurization waste water after dechlorination can be used as dilution water for reagent, desulfurization process water and other make-up water system for recycling, the saturated organic phase is subjected to back extraction, enters the second extraction equipment 8 through the second waste water pump 7, the second metering tank 9 adds back extraction agent into the second extraction equipment 8 through the second metering pump 10, after sufficient reaction, the concentration of chloride ions is reduced, but the calcium ions, sodium ions, magnesium ions and sulfate ions in the waste water are still very high, the waste water enters the water storage tank 12 through the third water pump 11, and is sent to the rotary atomization tower 14 through the spray water pump 13, when the desulfurization waste water is sent to the high-speed rotating atomization disc through the spray water pump 13, the waste water is stretched into a film or is pulled into a filament due to the action of centrifugal force, is broken and dispersed into droplets at the edge of the atomization disc, is evaporated and dried in the atomization tower 14 by high-temperature boiler flue gas, the high-temperature flue gas of the atomization tower 14 is extracted from the outlet of the existing denitration reactor 15, part of the evaporated crystalline salt is mixed into fly ash, and is captured and recovered by the electric dust collector 16 with the flue gas. Another part falls into the rotary atomization tower bottom hopper, is transported to the ash storage by the warehouse pump below the hopper, and is transported by air.
[0026] The above is only the preferred embodiment of the utility model, and it should be pointed out that for those skilled in the art, without departing from the overall concept of the utility model, some changes and improvements can be made, which should also be regarded as the protection range of the utility model.
Claims
1. A high-concentration desulfurization wastewater atomization treatment system, comprising a wastewater cyclone (1) connected to a wastewater buffer tank (2) by a pipeline, the wastewater buffer tank (2) connected to an input end of a first wastewater pump (3) by a pipeline, an output end of the first wastewater pump (3) connected to a first extraction device (4) by a pipeline, the first extraction device (4) connected to an input end of a second wastewater pump (7) by a pipeline, an output end of the second wastewater pump (7) connected to a second extraction device (8) by a pipeline, characterized in that: an atomization tower (14) is further included, the atomization tower (14) is provided with an atomization mechanism, the atomization mechanism is connected to the second extraction device (8), the atomization tower (14) is connected to a flue gas outlet of a denitration reactor (15) by a pipeline, a bottom of the atomization tower (14) is a funnel-shaped ash hopper, a conveying system is arranged at a bottom of the ash hopper, and an opening is arranged at a top of the atomization tower (14). The second extraction device (8) is connected to an input end of a third wastewater pump (11) by a pipeline, an output end of the third wastewater pump (11) is connected to a water storage tank (12) by a pipeline, the water storage tank (12) is connected to an input end of a spray water pump (13) by a pipeline, an output end of the spray water pump (13) is connected to the atomization mechanism by a pipeline, the atomization mechanism comprises a variable frequency motor, the variable frequency motor is fixed in the atomization tower (14), an output end of the variable frequency motor is fixedly connected to an atomization disc, and an input end of the atomization disc is connected to an output end of the spray water pump (13) by a pipeline.
2. The system for atomizing treatment of high concentration desulfurization wastewater according to claim 1, characterized in that: A rotating speed of the atomization disc is 10,000 rpm to 16,000 rpm, a diameter of the atomization disc is 200 mm to 250 mm, and a width of an output end of the atomization disc is 10 μm to 60 μm.
3. The system for atomizing treatment of high concentration desulfurization wastewater of claim 2, wherein: A stirrer is arranged in the wastewater buffer tank (2) and the water storage tank (12) respectively.
4. The system for atomizing treatment of high concentration desulfurization wastewater of claim 2, wherein: The flue gas outlet of the denitration reactor (15) is connected to the top of the atomization tower (14) by a pipeline; and a middle part of the atomization tower (14) is connected to an electrostatic precipitator (16) by a pipeline.
5. The system for atomizing treatment of high concentration desulfurization wastewater of claim 1, wherein: The first extraction device (4) is connected to an output end of a first metering pump (6) by a pipeline, an input end of the first metering pump (6) is connected to a first metering tank (5) by a pipeline, and extraction liquid is arranged in the first metering tank (5); and the second extraction device (8) is connected to an output end of a second metering pump (10) by a pipeline, an input end of the second metering pump (10) is connected to a second metering tank (9) by a pipeline, and back-extraction liquid is arranged in the second metering tank (9).
6. The system for atomizing treatment of high concentration desulfurization wastewater of claim 1, wherein: