A flexible desulfurization wastewater treatment system

Abstract

The present application relates to power plant desulfurization wastewater treatment device technical field, specifically disclose a kind of flexible desulfurization wastewater treatment system, comprising: pre-sedimentation tank, wastewater buffer tank, concentration tower, thick slurry tank, concentrated wastewater tank, smoke cooler, electric dust collector, ash storage and slag bin;By in the steam concentration, the main processing means is carried out on the basis, additionally increased bypass flue gas evaporation, go to air preheater outlet flue spray, and go to slag system spray consumption desulfurization wastewater means sample, increase different evaporation scheme, applicable to different working scene, avoid the problem that bypass flue gas evaporation system evaporation capacity is limited when unit low load, even cannot be used, make the desulfurization wastewater treatment mode more flexible, more practical.

Description

Technical Field

[0001] This invention relates to the technical field of power plant desulfurization wastewater treatment devices, and more specifically, to a flexible desulfurization wastewater treatment system. Background Technology

[0002] The vast majority of power plants in my country use limestone wet desulfurization technology to remove SO2 from flue gas. The desulfurization wastewater generated during operation is complex in composition and contains many types of pollutants, making it one of the most difficult wastewaters to treat from coal-fired power plants. Currently, the main method used in China to treat desulfurization wastewater is chemical precipitation (commonly known as triple-tank sedimentation). However, the treated effluent has a high salt content, and direct discharge can easily cause secondary pollution. Due to the relatively small volume and high salt content of desulfurization wastewater, in recent years, many scholars both domestically and internationally have begun to research zero-discharge treatment technologies for desulfurization wastewater.

[0003] Currently, coal-fired power plants generally use limestone-gypsum wet flue gas desulfurization technology. In the wet flue gas desulfurization process, in order to maintain stable system operation and ensure the quality of gypsum products, it is necessary to control the chloride ion concentration in the slurry to prevent it from becoming too high. Therefore, a portion of the slurry needs to be discharged, resulting in desulfurization wastewater.

[0004] Evaporation is a commonly used method in zero-discharge wastewater treatment, and it is also applied to the treatment of desulfurization wastewater. The basic principle of evaporation is that wastewater entering the evaporator is heated to boiling point by steam or an electric heater. The water in the wastewater gradually evaporates into steam, which is then cooled and recondensed back into water for reuse. Dissolved solids in the wastewater are retained in the evaporation residue, and as the concentration factor increases, they precipitate out in crystal form. With the continuous advancement of water treatment technology in recent years, multi-effect evaporation technology has developed rapidly due to its advantages of high heat transfer coefficient, high operational flexibility, simple influent pretreatment, and relatively low energy consumption, and is therefore widely used.

[0005] Evaporation has many advantages: the equipment is simple, no chemical reagents are required, and it can effectively overcome the disadvantages of existing wastewater treatment systems, such as multiple equipment, large investment, high operating costs, and a large workload for equipment maintenance; the operation is simple, and pollutants in wastewater are discharged in the form of ash, eliminating the problem of sludge disposal; however, the method is relatively simple and lacks flexibility; when the unit is under low load, the evaporation capacity of the evaporation system is limited, or even cannot be put into use, affecting normal operation. Summary of the Invention

[0006] The present invention aims to at least partially solve one of the technical problems in the related art.

[0007] Therefore, embodiments of the present invention propose a flexible desulfurization wastewater treatment system, comprising: a pre-sedimentation tank, a wastewater buffer tank, a thickening tower, a slurry tank, a concentrated wastewater tank, a flue gas cooler, an electrostatic precipitator, an ash silo, and a slag bin; wherein,

[0008] The inlet of the pre-sedimentation tank is connected to the effluent pipe of the desulfurization wastewater, and its drain port is connected to the dewatering system; the wastewater buffer tank is connected to the clear liquid port of the pre-sedimentation tank; the inlet of the thickening tower is connected to the outlet of the wastewater buffer tank; and the exhaust pipe of the boiler induced draft system is connected to the inner cavity of the thickening tower, so that the flue gas enters the thickening tower, contacts the desulfurization wastewater, and finally flows into the absorption tower; the inlet of the slurry tank is connected to the thickening tower, and forms a liquid circulation loop with the thickening tower through a circulation pipeline; a spray component is provided at one end of the liquid circulation loop that enters the thickening tower; the concentrated wastewater tank is connected to... The slurry tank and the concentrated wastewater tank are equipped with three outlet pipes, namely branch pipe one, branch pipe two, and branch pipe three. Branch pipe one is connected to the slag dryer, branch pipe two is connected to the flue gas evaporator, and branch pipe three is connected to the tail flue of the boiler. The tail flue of the boiler is connected to the inlet pipe of the flue gas evaporator. The inlet of the flue gas cooler is connected to the tail flue of the boiler and the exhaust pipe of the flue gas evaporator. The inlet of the electrostatic precipitator is connected to the exhaust port of the flue gas cooler. The ash silo and the slag bin are connected to the drain outlet of the flue gas evaporator.

[0009] Compared with the prior art, the advantages of the present invention are:

[0010] In addition to steam concentration as the main treatment method, bypass flue gas evaporation, air preheater outlet flue gas spraying, and slag removal system spraying to consume desulfurization wastewater have been added. Different evaporation schemes have been added to suit different working scenarios, avoiding the problem that the evaporation capacity of the bypass flue gas evaporation system is limited or even cannot be put into use when the unit is under low load. This makes the treatment of desulfurization wastewater more flexible and practical.

[0011] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the boiler induced draft system is provided with two induced draft branch pipes, which converge and connect to the absorption tower; the two induced draft branch pipes extend outward to form induced draft branch pipes; the two induced draft branch pipes converge and connect to the thickening tower through the induced draft main pipe, and a wastewater booster fan is installed on the induced draft main pipe.

[0012] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the boiler tail flue includes boiler flue one and boiler flue two; boiler flue one extends to form branch flue one and branch flue two, branch flue one is connected to the electrostatic precipitator, and branch flue two is connected to the flue gas evaporator; boiler flue two extends to form branch flue three and branch flue four, branch flue three is connected to the electrostatic precipitator, and branch flue four and branch flue two converge and are connected to the flue gas evaporator;

[0013] Air preheaters are respectively installed on branch flue one and branch flue four.

[0014] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, a dry slag machine spray pipe is provided at one end of the branch pipe that enters the dry slag machine; a rotary atomizer is provided at one end of the branch pipe that enters the flue gas evaporator.

[0015] In a preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the thickening tower is equipped with a thickening tower demister corresponding to the exhaust port.

[0016] In a preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the top of the concentrated wastewater tank is equipped with a dosing mechanism, which can inject drugs into the concentrated wastewater tank to adjust the pH value of the concentrated wastewater.

[0017] In a preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the dosing mechanism includes: a dosing tank and a mixing mechanism; wherein,

[0018] The dosing tank is located on top of the concentrated wastewater tank and is used to store the drug solution. It is equipped with a dosing pump and can deliver the drug solution into the concentrated wastewater tank through the dosing pump.

[0019] The mixing mechanism is located at the top of the concentrated wastewater tank, and its stirring part is located inside the concentrated wastewater tank for mixing wastewater and pharmaceutical solution.

[0020] The mixing mechanism includes: a lead screw sleeve, a transmission gear, a motor mounting base, a drive motor, a transmission gear, a lead screw assembly, a sliding limit rod, a sliding limit rod sleeve, a motor mounting base, a drive motor, a connecting block, an agitator, and a liquid level sensor; wherein,

[0021] The inner wall of the lead screw sleeve is threaded, and the outer wall is provided with an extension plate. Several universal balls are provided at the top and bottom of the extension plate. The top of the concentrated wastewater tank is provided with a mounting hole, the inner wall of which is provided with a connecting groove. The opposite sidewalls of the connecting groove are each provided with an annular limiting groove adapted to the universal balls. The extension plate passes through the connecting groove, and the universal balls are embedded in the annular limiting groove and rolled in connection with it. A transmission gear is fitted and fixed to the outer wall of the lead screw sleeve. A motor mounting base is connected to the top of the concentrated wastewater tank. A drive motor is connected to the motor mounting base, with its output shaft facing the transmission gear. A transmission gear is connected to the output shaft of the drive motor and meshes with the transmission gear. The lead screw component passes through the lead screw sleeve and is screwed to it. Rotation of the lead screw sleeve can drive the lead screw component to move vertically up and down. A sliding limiting rod is connected to the end of the lead screw component outside the concentrated wastewater tank. The sliding limit rod sleeve is fitted outside the sliding limit rod, axially limiting it while being slidably connected to the sliding limit rod; the second motor mounting base is connected to the top of the concentrated wastewater tank, opposite to the sliding limit rod sleeve; the second drive motor is connected to the second motor mounting base, and its output shaft is fixed to the sliding limit rod sleeve; it can drive the sliding limit rod and the lead screw component to rotate by driving the sliding limit rod sleeve; the first connecting block is fixed to the insertion end of the lead screw component; its side wall is provided with a threaded hole; the top of the agitator extends to form the second connecting block, the top of the second connecting block is provided with a connecting groove, and the side wall of the connecting groove is provided with a threaded hole; the first connecting block can be embedded in the second connecting block, and is detachably connected by bolts passing through the connecting groove and the threaded hole on one side wall of the connecting block; the liquid level sensor is connected to the bottom and top of the agitator to detect the liquid level of the wastewater.

[0022] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, a sample sampling mechanism is also provided, which can extract the wastewater from the concentrated wastewater tank to facilitate the detection of wastewater data.

[0023] In a preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the slurry tank is equipped with a mixing mechanism two having the same structure as the mixing mechanism one.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Other features and aspects of this disclosure will become clearer from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram illustrating the principle of an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the mixing mechanism one in an embodiment of the present invention.

[0028] Figure 3 yes Figure 2 The front view.

[0029] Figure 4 This is a schematic diagram of the lead screw sleeve connection.

[0030] Figure Labels

[0031] 1. Pre-sedimentation tank; 2. Wastewater buffer tank; 3. Thickening tower; 4. Slurry tank; 5. Concentrated wastewater tank; 6. Flue gas cooler; 7. Electrostatic precipitator; 8. Ash silo; 9. Slag bin; 10. Dewatering system; 11. Boiler induced draft system; 12. Absorption tower; 13. Spray system; 14. Branch pipe 1; 15. Branch pipe 2; 16. Branch pipe 3; 17. Slag dryer; 18. Flue gas evaporator; 19. Wastewater booster fan; 20. Air preheater; 21. Rotary atomizer; 22. Concentrator. Tower demister 22, mixing mechanism 1 23, liquid outlet pipe 24, lead screw sleeve 230, transmission gear 1 231, motor mounting base 1 232, drive motor 1 233, transmission gear 2 234, lead screw assembly 235, sliding limit rod 236, sliding limit rod sleeve 237, motor mounting base 2 238, drive motor 2 239, connecting block 1 240, stirring component 241, liquid level sensor 242, universal ball bearing 243. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] As described in the background section, evaporation has many advantages: the equipment is simple, no chemical reagents are required, and it can effectively overcome the disadvantages of existing wastewater treatment systems, such as numerous equipment, large investment, high operating costs, and a large workload for equipment maintenance; the operation is simple, and pollutants in the wastewater are discharged in the form of ash, eliminating the problem of sludge disposal; however, the method is relatively simple and lacks flexibility; when the unit is under low load, the evaporation capacity of the evaporation system is limited, or even cannot be put into use, affecting normal operation.

[0034] Reference Figure 1-4 As shown, to improve the above problems, this application proposes a flexible desulfurization wastewater treatment system, including: a pre-sedimentation tank 1, a wastewater buffer tank 2, a thickening tower 3, a slurry tank 4, a concentrated wastewater tank 5, a flue gas cooler 6, an electrostatic precipitator 7, an ash silo 8, and a slag silo 9; wherein,

[0035] The inlet of the pre-sedimentation tank 1 is connected to the outlet pipe 24 of the desulfurization wastewater, and its discharge port is connected to the dewatering system 10; the wastewater buffer tank 2 is connected to the clear liquid port of the pre-sedimentation tank 1; the inlet of the thickening tower 3 is connected to the outlet of the wastewater buffer tank 2; and the exhaust pipe of the boiler induced draft system 11 is connected to the inner cavity of the thickening tower 3. After the flue gas enters the thickening tower 3, it comes into contact with the desulfurization wastewater and finally flows into the absorption tower 12; the inlet of the slurry tank 4 is connected to the thickening tower 3, and forms a liquid circulation loop with the thickening tower 3 through a circulation pipeline; a spray component 13 is provided at one end of the liquid circulation loop that enters the thickening tower 3; the concentrated wastewater tank 5 is connected to the slurry tank. 4; The concentrated wastewater tank 5 is equipped with three outlet pipes, namely branch pipe one 14, branch pipe two 15 and branch pipe three 16; among them, branch pipe one 14 is connected to the dry slag machine 17, branch pipe two 15 is connected to the flue gas evaporator 18, and branch pipe three 16 is connected to the tail flue of the boiler; the tail flue of the boiler is connected to the air inlet pipe of the flue gas evaporator 18; the air inlet of the flue gas cooler 6 is connected to the tail flue of the boiler and the exhaust pipe of the flue gas evaporator 18 respectively; the air inlet of the electrostatic precipitator 7 is connected to the exhaust port of the flue gas cooler 6; the ash silo 8 and the slag bin 9 are respectively connected to the sewage outlet of the flue gas evaporator 18.

[0036] Specifically, a concentration circulation pump is installed in the liquid circulation loop to increase the flow rate of the liquid and ensure smooth circulation.

[0037] Specifically, a wastewater pump is installed on the pipeline between the wastewater buffer tank 2 and the concentration tower 3 to provide greater power for the flow of micro-wastewater.

[0038] Specifically, a sludge pump is installed on the pipeline between the pre-sedimentation tank 1 and the dewatering system 10 to provide stronger power for sludge discharge.

[0039] Specifically, branch pipe 14, branch pipe 25, and branch pipe 36 use solenoid valves to control different delivery paths, achieving a higher level of automation.

[0040] Compared with the prior art, the advantages of the present invention are:

[0041] In addition to steam concentration as the main treatment method, bypass flue gas evaporation, air preheater outlet flue gas spraying, and slag removal system spraying to consume desulfurization wastewater have been added. Different evaporation schemes have been added to suit different working scenarios, avoiding the problem that the evaporation capacity of the bypass flue gas evaporation system is limited or even cannot be put into use when the unit is under low load. This makes the treatment of desulfurization wastewater more flexible and practical.

[0042] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the boiler induced draft system 11 is provided with two induced draft branch pipes 1, which are connected to the absorption tower 12 after converging; the two induced draft branch pipes 1 extend outward to form induced draft branch pipes 2; the two induced draft branch pipes 2 are connected to the concentration tower 3 through the induced draft main pipe, and a wastewater booster fan 19 is installed on the induced draft main pipe.

[0043] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the tail flue of the boiler includes boiler flue one and boiler flue two; boiler flue one extends to form branch flue one and branch flue two, branch flue one is connected to electrostatic precipitator 7, and branch flue two is connected to flue gas evaporator 18; boiler flue two extends to form branch flue three and branch flue four, branch flue three is connected to electrostatic precipitator 7, and branch flue four and branch flue two converge and are connected to flue gas evaporator 18.

[0044] Air preheaters 20 are installed on branch flue 1 and branch flue 4 respectively.

[0045] It should be understood that air heating can be achieved through the air preheater 20, thereby improving the waste heat utilization rate.

[0046] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, a spray pipe for the dry slag machine 17 is provided at one end of the branch pipe 14 that enters the dry slag machine 17; a rotary atomizer 21 is provided at one end of the branch pipe 15 that enters the flue gas evaporator 18.

[0047] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the thickening tower 3 is equipped with a thickening tower demister 22 corresponding to the exhaust port. The flue gas can come into contact with the desulfurization wastewater through the spray component 13 in the thickening tower 3. After the flue gas is cooled, it carries some of the water in the wastewater. After the flue gas passes through the thickening tower demister 22 to remove the mist droplets, it enters the inlet flue of the absorption tower and returns to the desulfurization system, thus increasing the path of the concentrated wastewater.

[0048] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the top of the concentrated wastewater tank 5 is equipped with a dosing mechanism, which can inject chemicals into the concentrated wastewater tank 5 to adjust the pH value of the concentrated wastewater.

[0049] It should be understood that the dosing unit adjusts the pH of the concentrated wastewater to approximately 6 by injecting a 30% concentration of liquid alkali into the concentrated wastewater tank 5. A concentrate transfer pump installed at the bottom pumps the concentrated wastewater out for further treatment.

[0050] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the dosing mechanism includes: a dosing tank and a mixing mechanism 23; wherein,

[0051] The dosing tank is located on top of the concentrated wastewater tank 5 and is used to store the chemical solution. It is equipped with a dosing pump, which can deliver the chemical solution into the concentrated wastewater tank 5.

[0052] The mixing mechanism 23 is located on the top of the concentrated wastewater tank 5, and its stirring part is located inside the concentrated wastewater tank 5 for mixing wastewater and pharmaceutical solution.

[0053] The mixing mechanism 23 includes: a lead screw sleeve 230, a transmission gear 231, a motor mounting base 232, a drive motor 233, a transmission gear 234, a lead screw assembly 235, a sliding limit rod 236, a sliding limit rod sleeve 237, a motor mounting base 238, a drive motor 239, a connecting block 240, an agitator 241, and a liquid level sensor 242; wherein,

[0054] The inner wall of the lead screw sleeve 230 is threaded, and the outer wall is provided with an extension plate. Several universal balls 243 are provided at the top and bottom of the extension plate. The top of the concentrated wastewater tank 5 is provided with a mounting hole, the inner wall of which is provided with a connecting groove. The opposite side walls of the connecting groove are provided with annular limiting grooves adapted to the universal balls 243. The extension plate passes into the connecting groove, and the universal balls 243 are embedded in the annular limiting grooves and roll in connection with them. The transmission gear 231 is sleeved and fixed to the outer wall of the lead screw sleeve 230. The motor is installed... Mounting seat 232 is connected to the top of the concentrated wastewater tank 5; drive motor 233 is connected to motor mounting seat 232, with its output shaft facing transmission gear 231; transmission gear 234 is connected to the output shaft of drive motor 233 and meshes with transmission gear 231; lead screw component 235 passes through lead screw sleeve 230 and is screwed to it; rotation of lead screw sleeve 230 can drive lead screw component 235 to move vertically up and down; sliding limit rod 236 is connected to a position of lead screw component 235 outside the concentrated wastewater tank 5. The sliding limit rod sleeve 237 is sleeved on the outside of the sliding limit rod 236, which limits its axial movement and can slide with the sliding limit rod 236; the motor mounting base 238 is connected to the top of the concentrated wastewater tank 5 and is opposite to the sliding limit rod sleeve 237; the drive motor 239 is connected to the motor mounting base 238, and its output shaft is fixed to the sliding limit rod sleeve 237; it can drive the sliding limit rod 236 and the lead screw component 235 to rotate by driving the sliding limit rod sleeve 237. Connecting block 240 is fixed to the insertion end of lead screw component 235; its side wall is provided with threaded hole; the top of agitator 241 extends to form connecting block 2, the top of connecting block 2 is provided with connecting groove, and the side wall of connecting groove is provided with threaded hole; connecting block 240 can be embedded in connecting block 2, and a detachable connection is achieved by bolts passing through the connecting groove and the threaded hole on the side wall of connecting block 240; liquid level sensor 242 is connected to the bottom and top of agitator 241 and is used to detect the liquid level of sewage.

[0055] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, the slurry tank 4 is equipped with a mixing mechanism 2, which has the same structure as the mixing mechanism 23.

[0056] It should be understood that when it is necessary to adjust the height of the stirring component 241 in the concentrated wastewater tank 5, the drive motor 233 drives the lead screw sleeve 230 to rotate through the transmission gear 231 and the transmission gear 234. This, in turn, drives the lead screw component 235 to move vertically up and down along the lead screw sleeve 230. The lead screw component 235 drives the sliding limit rod 236 to slide within the sliding limit rod sleeve 237, thereby adjusting the height of the stirring component 241. After the height is adjusted, the drive motor 239 can drive the lead screw component 235 and the lead screw sleeve 230 to rotate synchronously by adjusting the sliding limit rod sleeve 237 and the sliding limit rod 236, thus stirring the wastewater in the concentrated wastewater tank 5. This solution is applicable to stirring wastewater at different liquid levels in the concentrated wastewater tank 5, making it more practical. It can ensure the uniformity of the mixed solution in the concentrated wastewater tank 5, improve the stirring effect, and avoid the problem of uneven mixing at the bottom of the concentrated wastewater tank 5.

[0057] In the preferred embodiment of the above-mentioned flexible desulfurization wastewater treatment system, a sample sampling mechanism is also provided, which can extract the wastewater from the concentrated wastewater tank 5 to facilitate the detection of wastewater data.

[0058] It should be understood that by using sampling and testing agencies, wastewater samples can be monitored regularly within a specified time to avoid problems such as excessive or insufficient chemical solutions, thus ensuring desulfurization effect and reducing costs.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flexible desulfurized wastewater treatment system, characterized by, include: The pre-sedimentation tank has its inlet connected to the outlet pipe of the desulfurization wastewater, and its sewage discharge port connected to the dewatering system. Wastewater buffer tank, connected to the clear liquid port of the pre-sedimentation tank; The thickening tower has its inlet connected to the outlet of the wastewater buffer tank; and the exhaust pipe of the boiler induced draft system is connected to the inner cavity of the thickening tower. After the flue gas enters the thickening tower, it comes into contact with the desulfurization wastewater and finally flows into the absorption tower. A slurry tank has its inlet connected to the thickening tower and forms a liquid circulation loop with the thickening tower through a circulation pipeline; a spray component is provided at one end of the liquid circulation loop that enters the thickening tower. A concentrated wastewater tank is connected to the concentrated slurry tank; the concentrated wastewater tank is provided with three outlet pipes, namely branch pipe one, branch pipe two and branch pipe three; wherein, branch pipe one is connected to the slag dryer, branch pipe two is connected to the flue gas evaporator, and branch pipe three is connected to the tail flue of the boiler; the tail flue of the boiler is connected to the air inlet pipe of the flue gas evaporator. The flue gas cooler has its inlet end connected to the tail flue of the boiler and the exhaust pipe of the flue gas evaporator, respectively. An electrostatic precipitator, the air inlet of which is connected to the exhaust port of the flue gas cooler; The ash silo and slag silo are respectively connected to the drain outlet of the flue gas evaporator; The boiler induced draft system is provided with two induced draft branch pipes, which converge and connect to the absorption tower; the two induced draft branch pipes extend outward to form induced draft branch pipes; the two induced draft branch pipes converge and connect to the concentration tower through the main induced draft pipe, and a wastewater booster fan is installed on the main induced draft pipe. The boiler's tail flue includes boiler flue one and boiler flue two; boiler flue one extends to form branch flue one and branch flue two, branch flue one connects to the electrostatic precipitator, and branch flue two connects to the flue gas evaporator; boiler flue two extends to form branch flue three and branch flue four, branch flue three connects to the electrostatic precipitator, and branch flue four merges with branch flue two and connects to the flue gas evaporator; air preheaters are respectively installed on branch flue one and branch flue four. A spray pipe for the dry slag machine is installed at one end of the branch pipe 1 that enters the dry slag machine; a rotary atomizer is installed at one end of the branch pipe 2 that enters the flue gas evaporator; a demister for the concentration tower corresponding to the exhaust port is installed inside the concentration tower; a dosing mechanism is provided at the top of the concentration wastewater tank, which can inject drugs into the concentration wastewater tank to adjust the pH value of the concentrated wastewater. The drug dispensing unit includes: A dosing tank, located on top of the concentrated wastewater tank, is used to store the chemical solution and is equipped with a dosing pump inside; the dosing pump can deliver the chemical solution into the concentrated wastewater tank. Mixing mechanism one is located at the top of the concentrated wastewater tank, and its stirring part is located inside the concentrated wastewater tank for mixing wastewater and pharmaceutical solution; Hybrid mechanism one includes: The lead screw sleeve has threads on its inner wall and an extension plate on its outer wall. Several universal balls are provided at the top and bottom of the extension plate. The top of the concentrated wastewater tank has a mounting hole, and the inner wall of the mounting hole has a connecting groove. The opposite side walls of the connecting groove each have an annular limiting groove adapted to the universal balls. The extension plate passes through the connecting groove, and the universal balls are embedded in the annular limiting groove and roll in contact with it. One transmission gear is sleeved and fixed on the outer wall of the lead screw sleeve; Motor mounting bracket one is connected to the top of the concentrated wastewater tank; A drive motor is connected to the motor mounting base, and its output shaft faces the transmission gear. The second transmission gear is connected to the output shaft of the first drive motor and meshes with the first transmission gear; A lead screw component passes through and is screwed to the lead screw sleeve; rotation of the lead screw sleeve can drive the lead screw component to move vertically up and down. A sliding limit rod is connected to the end of the lead screw component located outside the concentrated wastewater tank; A sliding limit rod sleeve is fitted over the outside of the sliding limit rod, which limits its axial movement while also being able to slide with the sliding limit rod. Motor mounting bracket two is connected to the top of the concentrated wastewater tank and is opposite to the sliding limit rod sleeve; A second drive motor is connected to the second motor mounting base, and its output shaft is fixed to the sliding limit rod sleeve; it can drive the sliding limit rod and the lead screw component to rotate by driving the sliding limit rod sleeve. Connecting block one is fixed to the insertion end of the lead screw component; its side wall is provided with a threaded hole; The stirring component has a top extension forming a connecting block two. The top of the connecting block two is provided with a connecting groove, and the side wall of the connecting groove is provided with a threaded hole. The connecting block one can be embedded in the connecting block two and is detachably connected by a bolt that passes through the connecting groove and the threaded hole on the side wall of the connecting block. A level sensor, connected to the bottom and top of the agitator, is used to detect the level of the wastewater.

2. A flexible desulphurised wastewater treatment system according to claim 1 characterised in that, It is also equipped with a sample sampling and testing mechanism, which can extract the wastewater from the concentrated wastewater tank to facilitate the detection of wastewater data.

3. A flexible desulphurised wastewater treatment system according to claim 2, characterised in that, The thickened slurry tank is equipped with a mixing mechanism two, which has the same structure as the mixing mechanism one.

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