Wastewater rotary drying system

Abstract

The utility model relates to a waste water rotary drying system which comprises a boiler hearth, an air preheater, a dust remover, a desulfurization device, a chimney and the like. The rotary drying tower is provided with a flue gas and wastewater inlet and outlet. A flue gas outlet of the boiler hearth is connected with the air preheater and the bag-type dust collector; a gas outlet of the bag-type dust collector is connected with two flue gas inlets of the rotary drying tower, and a flue gas outlet of the drying tower is connected with an induced draft fan and then connected to the dust collector. And a flue gas outlet of the air preheater is also connected to the dust remover. And an air outlet of the dust remover is connected to a desulfurization device and then is discharged through a chimney. Waste liquid of the desulfurization device and discharged sewage of the rotary drying tower are introduced into the waste water turbidity removal device, enter the waste water buffer pool after being treated, and are circulated to a waste water inlet of the rotary drying tower through the waste water lifting pump. Therefore, a complete environment-friendly treatment system is formed, circular treatment of waste gas and waste water is realized, and the system is environment-friendly and efficient. The whole process is compact, and effective treatment and reutilization of waste gas and waste water are ensured.

Description

Technical Field

[0001] The utility model relates to a waste water rotary drying system, belonging to the technical field of industrial waste water treatment. Background Technique

[0002] With the continuous improvement of the country's environmental protection requirements, more and more power plants are required to achieve zero discharge of the whole plant's waste water. In order to respond to the environmental protection policy, coal-fired power plants give priority to implementing hierarchical recovery and cascade utilization of waste water in the plant, and recycle the waste water with better water quality to different systems to reduce the waste water treatment volume. At the same time, the power plant also controls the concentration ratio of circulating cooling water and the chloride ion content in the slurry of the desulfurization system to further reduce the generation of high-salt waste water.

[0003] In order to achieve zero discharge of waste water, coal-fired power plants generally adopt the process of atomizing desulfurization waste water and spraying it into the main flue or bypass flue. In this way, solid-liquid separation of waste water can be achieved. The water vapor in the waste water enters the dust collector with the flue gas, while the salts are mixed with dry ash.

[0004] In addition, when the main flue or bypass flue atomization process is adopted, the comprehensive utilization of fly ash also faces problems. According to the requirements of "General Portland Cement" (GB 175-2023), the chloride ion content in cement should be less than 0.06%. With the increase of the chloride ion content in fly ash, this will affect the blending ratio of fly ash in Portland cement and further affect the sales of fly ash.

[0005] The prior art, such as the Chinese patent with the patent number "WO2020108135A1", discloses a desulfurization waste water treatment system and a desulfurization waste water treatment method. The method includes: the flue gas generated by a coal-fired power plant is successively introduced into a denitration device, an air preheater, a dust collector and a wet desulfurization absorption tower through a flue gas main pipeline, and then discharged to the outside. The flue gas main pipeline includes a first side pipeline and a second side pipeline, and the flue gas temperature in the first side pipeline is higher than that in the second side pipeline; the desulfurization waste water treatment system includes a pre-sedimentation tank communicated with the water outlet of the wet desulfurization absorption tower; a concentration tower, the water inlet of the concentration tower is communicated with the water outlet of the pre-sedimentation tank, and the air inlet of the concentration tower is communicated with the second side pipeline, for concentrating the desulfurization waste water by using the flue gas in the second side pipeline; an evaporator, the water inlet of the evaporator is communicated with the water outlet of the concentration tower, and the air inlet of the evaporator is communicated with the first side pipeline, for evaporating and drying the concentrated desulfurization waste water by using the flue gas in the first side pipeline.

[0006] The problems existing in the above-mentioned prior art are that the atomization effect of the wastewater cannot meet the design requirements and the nozzles are blocked during long-term operation, affecting the wastewater consumption effect. When the atomization effect of the wastewater decreases, the following problems will occur: the wastewater treatment capacity decreases, and the nozzle blockage further affects the atomization of the wastewater, which may lead to the shutdown of the wastewater injection device; the operating energy consumption increases, the wastewater treatment capacity per unit time decreases, and the only adjustment method is to increase the usage of compressed air, thus significantly increasing the energy consumption; poor atomization effect of the wastewater will also cause a "water column" to form at the nozzle opening, resulting in a large amount of wastewater agglomeration, blocking the ash conveying system, and further leading to the shutdown of the system. Summary of the Invention

[0007] In order to solve the problems existing in the above-mentioned prior art, the present invention proposes a wastewater rotary drying system.

[0008] The technical solution of the present invention is as follows:

[0009] The present invention provides a wastewater rotary drying system, including a boiler furnace, an air preheater, a dust collector, a desulfurization device, a chimney, a bag filter, a rotary drying tower, an induced draft fan, a wastewater lift pump, a wastewater buffer tank, and a wastewater turbidity removal device;

[0010] The rotary drying tower includes a first flue gas inlet, a second flue gas inlet, a wastewater inlet, a blowdown port, and a flue gas discharge port;

[0011] The flue gas outlet of the boiler furnace is respectively connected to the flue gas inlet of the air preheater and the air inlet of the bag filter through pipelines; the air outlet of the bag filter is respectively connected to the first flue gas inlet and the second flue gas inlet through pipelines, and the flue gas discharge port is connected to the air inlet of the induced draft fan through a pipeline;

[0012] The air outlet of the induced draft fan is connected to the air inlet of the dust collector through a pipeline, and the flue gas outlet of the air preheater is also connected to the air inlet of the dust collector through a pipeline; the air outlet of the dust collector is connected to the inlet of the desulfurization device through a pipeline, the outlet of the desulfurization device is connected to the air inlet of the chimney through a pipeline, and the waste liquid discharge port of the desulfurization device is connected to the water inlet of the wastewater turbidity removal device through a pipeline;

[0013] The blowdown port is connected to the water inlet of the wastewater turbidity removal device through a pipeline, the water outlet of the wastewater turbidity removal device is connected to the water inlet of the wastewater buffer tank through a pipeline, and the water outlet of the wastewater buffer tank is connected to the wastewater inlet through a pipeline;

[0014] A wastewater lift pump is also provided on the pipeline connecting the water outlet of the wastewater buffer tank to the wastewater inlet.

[0015] As a preferred embodiment, the rotary drying tower further includes modified silica gel, a rotary drying tower shell, a rotary motor, a rotary electrode plate, and a liquid level control probe;

[0016] The flue gas outlet is arranged at the top end of the rotary drying tower shell;

[0017] The first flue gas inlet and the second flue gas inlet are arranged on both sides of the lower end of the rotary drying tower shell;

[0018] The waste water inlet is arranged at the bottom of the rotary drying tower shell, below the first flue gas inlet or the second flue gas inlet;

[0019] The liquid level control probe is placed horizontally, the bottom of the liquid level control probe is fixedly connected to the inner wall of the rotary drying tower shell, and the liquid level control probe is arranged below the waste water inlet;

[0020] The sewage outlet is arranged at the bottom end of the rotary drying tower shell;

[0021] Two rotating motors, one high and one low, are arranged on the inner wall of the rotary drying tower shell;

[0022] The rotating electrode plate is sleeved outside the two rotating motors, and the rotating motors can drive the rotating electrode plate to rotate clockwise or counterclockwise;

[0023] A number of the modified silica gels are fixedly connected to the outside of the rotating electrode plate through connecting columns.

[0024] As a preferred embodiment, the waste water turbidity removal device adopts a triple-tank treatment system including a neutralization tank, a sedimentation tank and a flocculation tank or an integrated waste water treatment system.

[0025] As a preferred embodiment, it further includes a first flue gas valve, a second flue gas valve and a third flue gas valve;

[0026] The first flue gas valve is arranged on the pipeline connecting the flue gas outlet of the boiler furnace and the air inlet of the bag filter;

[0027] The second flue gas valve is arranged on the pipeline connecting the air outlet of the bag filter and the second flue gas inlet;

[0028] The third flue gas valve is arranged on the pipeline connecting the air outlet of the bag filter and the first flue gas inlet.

[0029] As a preferred embodiment, it further includes a flow valve;

[0030] The flow valve is arranged on the pipeline connecting the water outlet of the waste water buffer tank and the waste water inlet.

[0031] As a preferred embodiment, the dust discharge ports of the dust collector and the bag filter are connected to the storage ash warehouse through pipelines.

[0032] As a preferred embodiment, a number of pores are provided on the outer surface and inside of the modified silica gel.

[0033] As a preferred embodiment, the desulfurization device is a wet desulfurization device. The flue gas is discharged to the chimney through a pipeline, and the generated desulfurization wastewater is discharged to the wastewater turbidity removal device through a pipeline.

[0034] As a preferred embodiment, the modified silica gel uses acrylic acid, sodium sulfite, and silicon oxide as raw materials;

[0035] The bottom of the rotary drying tower shell is made of C276 alloy.

[0036] The utility model has the following beneficial effects:

[0037] 1. Through the combined use of the bag filter, rotary drying tower, and dust collector, the utility model realizes the efficient purification of flue gas. The bag filter can first remove most of the particulate matter, the rotary drying tower further treats the moisture and pollutants in the flue gas, and finally, the dust collector ensures the cleanliness of the flue gas, improving the overall flue gas treatment efficiency.

[0038] 2. The wastewater turbidity removal device and wastewater buffer pool are set in the utility model, realizing the recycling of wastewater. The waste liquid generated by the desulfurization device and the wastewater discharged from the rotary drying tower can be reused for the wastewater inlet in the rotary drying tower after turbidity removal treatment, which not only saves water resources but also reduces wastewater discharge, meeting the environmental protection concept.

[0039] 3. Through the setting of the liquid level control probe, the utility model can monitor the wastewater level in the rotary drying tower in real time, thereby intelligently controlling the operation of the wastewater lift pump to keep the liquid level in the tower stable, optimizing the operation efficiency and safety of the equipment.

[0040] 4. The modified silica gel and rotary plate structure are arranged inside the rotary drying tower of the utility model. The modified silica gel can effectively adsorb the moisture and certain pollutants in the flue gas, while the rotary plate enhances the contact efficiency between the silica gel and the flue gas, improving the drying and purification effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is the system schematic diagram of the utility model.

[0042] Figure 2 is the perspective view of the rotary drying tower of the utility model.

[0043] The reference numerals in the drawings are shown as:

[0044] 1. Boiler furnace; 2. Air preheater; 3. Dust collector; 4. Desulfurization device; 5. Chimney; 6. Bag filter; 8. Rotary drying tower; 9. Induced draft fan; 10. Wastewater lift pump; 11. Wastewater buffer tank; 12. Wastewater turbidity removal device; 801. First flue gas inlet; 802. Second flue gas inlet; 803. Wastewater inlet; 804. Drain port; 805. Flue gas discharge port; 806. Modified silica gel; 807. Rotary drying tower housing; 808. Rotary motor; 809. Rotary electrode plate; 810. Liquid level control probe; 71. First flue gas valve; 72. Second flue gas valve; 73. Third flue gas valve; 74. Flow valve. Detailed implementation manners

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] It should be understood that the step numbers used herein are only for convenient description and do not limit the execution sequence of the steps.

[0047] It should be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless otherwise clearly specified in the context, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0048] The terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0049] The term " / or" refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0050] Embodiment 1:

[0051] Refer to Figure 1-2 , the present invention provides a wastewater rotary drying system, which constitutes a complete environmental protection treatment system and realizes the cyclic treatment of wastewater; it includes a boiler furnace 1, an air preheater 2, a dust collector 3, a desulfurization device 4, a chimney 5, a bag filter 6, a rotary drying tower 8, an induced draft fan 9, a wastewater lift pump 10, a wastewater buffer tank 11 and a wastewater turbidity removal device 12;

[0052] The rotary drying tower 8 includes a first flue gas inlet 801, a second flue gas inlet 802, a wastewater inlet 803, a sewage outlet 804, and a flue gas discharge port 805;

[0053] The flue gas outlet of the boiler furnace 1 is respectively connected to the flue gas inlet of the air preheater 2 and the air inlet of the bag filter 6 through pipelines; the air outlet of the bag filter 6 is respectively connected to the first flue gas inlet 801 and the second flue gas inlet 802 through pipelines, and the flue gas discharge port 805 is connected to the air inlet of the induced draft fan 9 through a pipeline;

[0054] The air outlet of the induced draft fan 9 is connected to the air inlet of the dust remover 3 through a pipeline, and the flue gas outlet of the air preheater 2 is also connected to the air inlet of the dust remover 3 through a pipeline; the air outlet of the dust remover 3 is connected to the inlet of the desulfurization device 4 through a pipeline, the outlet of the desulfurization device 4 is connected to the air inlet of the chimney 5 through a pipeline, and the waste liquid discharge port of the desulfurization device 4 is connected to the water inlet of the wastewater turbidity removal device 12 through a pipeline;

[0055] The sewage outlet 804 is connected to the water inlet of the wastewater turbidity removal device 12 through a pipeline, the water outlet of the wastewater turbidity removal device 12 is connected to the water inlet of the wastewater buffer tank 11 through a pipeline, and the water outlet of the wastewater buffer tank 11 is connected to the wastewater inlet 803 through a pipeline;

[0056] A wastewater lift pump 10 is also provided on the pipeline connecting the water outlet of the wastewater buffer tank 11 and the wastewater inlet 803.

[0057] As a preferred embodiment, the rotary drying tower 8 further includes modified silica gel 806, a rotary drying tower housing 807, a rotary motor 808, a rotary electrode plate 809, and a liquid level control probe 810;

[0058] The flue gas discharge port 805 is arranged at the top of the rotary drying tower housing 807;

[0059] The first flue gas inlet 801 and the second flue gas inlet 802 are arranged on both sides of the lower end of the rotary drying tower housing 807;

[0060] The wastewater inlet 803 is arranged at the bottom of the rotary drying tower housing 807, below the first flue gas inlet 801 or the second flue gas inlet 802;

[0061] The liquid level control probe 810 is placed horizontally, the bottom of the liquid level control probe 810 is fixedly connected to the inner wall of the rotary drying tower housing 807, and the liquid level control probe 810 is arranged below the wastewater inlet 803; when the liquid level is too low, the inlet valve will be opened to control the liquid level.

[0062] The sewage outlet 804 is arranged at the bottom end of the rotary drying tower shell 807; the miscellaneous salts in the wastewater are collected separately and do not enter the fly ash, avoiding the problem of difficult comprehensive utilization of fly ash caused by excessive chloride ion content.

[0063] Two rotating motors 808, one high and one low, are arranged on the inner wall of the rotary drying tower shell 807;

[0064] The rotating electrode plate 809 is sleeved on the outer circles of the two rotating motors 808, and the rotating motors 808 can drive the rotating electrode plate 809 to rotate clockwise or counterclockwise;

[0065] A plurality of the modified silica gels 806 are fixedly connected to the outside of the rotating electrode plate 809 through connecting columns.

[0066] The rotating motors 808 can drive the rotating electrode plate 809 to rotate clockwise or counterclockwise. When the modified silica gel 806 is immersed in water, the modified silica gel 806 adsorbs a large amount of water. After absorbing water, the modified silica gel 806 rotates in the rotary drying tower 8. Through the drying effect of the high-temperature flue gas, the water in the body evaporates and is carried out of the rotary drying tower 8 by the high-temperature flue gas. The dried modified silica gel 806 enters the water again, adsorbs a large amount of water again, and is dried again, and so on.

[0067] As a preferred embodiment, the wastewater turbidity removal device 12 adopts a triple-tank treatment system including a neutralization tank, a sedimentation tank and a flocculation tank or adopts an integrated wastewater treatment system. Ensure that the suspended matter in the effluent quality of the wastewater is less than 20 mg / L.

[0068] As a preferred embodiment, it further includes a first flue gas valve 71, a second flue gas valve 72 and a third flue gas valve 73;

[0069] The first flue gas valve 71 is arranged on the pipeline connecting the flue gas outlet of the boiler furnace 1 and the air inlet of the bag filter 6;

[0070] The second flue gas valve 72 is arranged on the pipeline connecting the air outlet of the bag filter 6 and the second flue gas inlet 802;

[0071] The third flue gas valve 73 is arranged on the pipeline connecting the air outlet of the bag filter 6 and the first flue gas inlet 801.

[0072] The air preheater 2 and the bag filter 6 are provided with the first flue gas valve 71, which is used to adjust the extraction of the high-temperature flue gas at the front end of the air preheater 2. By monitoring the flue gas temperature at the inlet of the rotary drying tower 8 and the flue gas temperature at the flue gas discharge port 806, the extraction amount of the high-temperature flue gas is adjusted to ensure that the rotary drying tower 8 operates well and the evaporation amount of the wastewater reaches the design requirements.

[0073] There are a second flue gas valve 72 and a third flue gas valve 73 on two flue gas paths between the dust collector 2 and the rotary drying tower 8, which are used to control the amount of flue gas entering both sides of the rotary drying tower 8. According to the flue gas temperature monitoring devices at different positions inside the rotary drying tower 8, different amounts of flue gas are controlled to achieve a temperature balance device.

[0074] As a preferred embodiment, it further includes a flow valve 74;

[0075] The flow valve 74 is arranged on the pipeline connecting the water outlet of the wastewater buffer tank 11 and the wastewater inlet 803.

[0076] There is a flow valve 74 between the wastewater inlet 803 of the rotary drying tower 8 and the wastewater lift pump 10 to control the flow of wastewater into the wastewater lift pump 10 and meet the bottom liquid level height controlled by the liquid level control probe 810.

[0077] As a preferred embodiment, the dust discharge ports of the dust collector 3 and the bag filter 6 are connected to the pipeline of the ash storage warehouse. The dust in the air is collected into the ash storage warehouse for regular cleaning.

[0078] As a preferred embodiment, a number of pores are provided on both the outer surface and the inside of the modified silica gel 806. To increase the water absorption effect.

[0079] As a preferred embodiment, the desulfurization device 4 is a wet desulfurization device. The flue gas is discharged to the chimney 5 through a pipeline, and the generated desulfurized wastewater is discharged to the wastewater turbidity removal device 12 through a pipeline.

[0080] As a preferred embodiment, the modified silica gel 806 uses acrylic acid, sodium sulfite and silicon oxide as raw materials;

[0081] The bottom of the rotary drying tower shell 807 is made of C276 alloy. To prevent corrosion by wastewater.

[0082] Embodiment Two:

[0083] In order to overcome the poor wastewater atomization effect in the current existing zero - discharge technology route of desulfurized wastewater, the present utility model utilizes the good water absorption property of the highly efficient modified silica gel 806 and the heat in the flue gas of the coal - fired unit to evaporate the water absorbed by the modified silica gel 806. The evaporated water returns to the unit flue duct along with the flue gas, realizing the continuous concentration of the wastewater.

[0084] The specific treatment process is as follows:

[0085] The process involves opening the flow valve 74. The wastewater lift pump 10 transports the pretreated wastewater to the rotary drying tower 8, and the bottom liquid level is controlled by the liquid level control probe 810 to maintain at a certain height to meet the requirements of system operation. When the liquid level in the rotary drying tower 8 is stable, the first flue gas valve 71, the second flue gas valve 72, and the third flue gas valve 73 slowly open the valves, and the induced draft fan 9 is started to extract the high-temperature flue gas from the boiler furnace 1. The bag filter 6 starts to operate to remove the fly ash in the high-temperature flue gas. The opening degrees of the first flue gas valve 71, the second flue gas valve 72, and the third flue gas valve 73 are controlled to ensure the required high-temperature flue gas volume in the rotary drying tower 8 and the balance on both sides. The rotary motor 808 is turned on to drive the rotary plate 809 and the modified silica gel 806 to rotate clockwise (counterclockwise). When the modified silica gel 806 rotates to the bottom wastewater in the tower, the modified silica gel 806 will be immersed in the wastewater. The modified silica gel 806 will adsorb a large amount of wastewater and store it in the body of the modified silica gel 806. During the rotation process, due to the drying effect of the high-temperature flue gas, the wastewater inside the modified silica gel 806 slowly evaporates, and the water vapor is carried out of the rotary drying tower 8 by the dry flue gas, passes through the top flue gas outlet 805 and the induced draft fan 9, and returns to the inlet flue of the dust collector 3. The salts in the wastewater are converted into crystal particles and stored in the body of the modified silica gel 806.

[0086] During the rotation process, the modified silica gel 806 is immersed in the wastewater again, and the salts in the body will dissolve in the wastewater again. The modified silica gel 806 adsorbs a large amount of wastewater again, and so on in a cycle. When the solubility of the salts in the wastewater reaches a certain level, the salts in the wastewater will precipitate and settle at the bottom of the rotary drying tower 8. At this time, the bottom blowdown port 804 will be opened to transport the bottom sludge and miscellaneous salts to the wastewater turbidity removal device 12 to remove the solid particles in the wastewater. The wastewater after removing the particles will enter the rotary drying tower 8 again through the wastewater lift pump 10 and the wastewater buffer tank 11 for re-concentration.

[0087] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent the cases of A existing alone, A and B existing simultaneously, and B existing alone. Where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one of the following" and its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0088] The above are only embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present utility model.

Claims

1. A wastewater rotary drying system, characterized in that: It comprises a boiler furnace (1), an air preheater (2), a dust collector (3), a desulfurization device (4), a chimney (5), a bag filter (6), a rotary drying tower (8), an induced draft fan (9), a wastewater lifting pump (10), a wastewater buffer tank (11) and a wastewater turbidity removal device (12); The rotary drying tower (8) comprises a first smoke inlet (801), a second smoke inlet (802), a wastewater inlet (803), a sewage outlet (804), and a smoke outlet (805); The flue gas outlet of the boiler furnace (1) is respectively connected to the flue gas inlet of the air preheater (2) and the air inlet pipe of the bag filter (6); the air outlet of the bag filter (6) is respectively connected to the first flue gas inlet (801) and the second flue gas inlet (802) pipes, and the flue gas outlet (805) is connected to the air inlet pipe of the induced draft fan (9); The air outlet of the induced draft fan (9) is connected to the air inlet pipeline of the dust collector (3), and the flue gas outlet of the air preheater (2) is also connected to the air inlet pipeline of the dust collector (3); the air outlet of the dust collector (3) is connected to the inlet pipeline of the desulfurization device (4), the outlet of the desulfurization device (4) is connected to the air inlet pipeline of the chimney (5), and the waste liquid discharge port of the desulfurization device (4) is connected to the water inlet pipeline of the wastewater de-turbidity device (12); The sewage outlet (804) is connected to the water inlet pipe of the wastewater turbidity removal device (12), the water outlet of the wastewater turbidity removal device (12) is connected to the water inlet pipe of the wastewater buffer tank (11), and the water outlet of the wastewater buffer tank (11) is connected to the wastewater inlet pipe (803); A wastewater lifting pump (10) is also provided on the pipeline connecting the water outlet of the wastewater buffer tank (11) and the wastewater inlet (803).

2. A wastewater rotary drying system according to claim 1, characterized in that: The rotary drying tower (8) further comprises modified silica gel (806), a rotary drying tower shell (807), a rotary motor (808), a rotary pole plate (809) and a liquid level control probe (810); The smoke outlet (805) is arranged at the top of the rotary drying tower shell (807); The first smoke inlet (801) and the second smoke inlet (802) are arranged on both sides of the lower end of the rotary drying tower shell (807); The wastewater inlet (803) is arranged at the bottom of the rotary drying tower shell (807), below the first flue gas inlet (801) or the second flue gas inlet (802); The liquid level control probe (810) is placed horizontally, the bottom of the liquid level control probe (810) is fixedly connected to the inner wall of the rotary drying tower shell (807), and the liquid level control probe (810) is arranged below the wastewater inlet (803); The sewage outlet (804) is arranged at the bottom end of the rotary drying tower shell (807); The inner wall of the rotary drying tower shell (807) is provided with two rotary motors (808), one high and one low; The rotating pole plate (809) is sleeved on the outer rings of the two rotating motors (808), and the rotating motors (808) can drive the rotating pole plate (809) to rotate clockwise or counterclockwise; A plurality of modified silica gels (806) are fixedly connected to the outer side of the rotating pole plate (809) via connecting columns.

3. A wastewater rotary drying system according to claim 1, characterized in that: The wastewater turbidity removal device (12) adopts a three-tank treatment system including a neutralization tank, a sedimentation tank and a flocculation tank, or adopts an integrated wastewater treatment system.

4. A wastewater rotary drying system according to claim 1, characterized in that: It also includes a first smoke valve (71), a second smoke valve (72) and a third smoke valve (73); The first flue gas valve (71) is arranged on a pipeline connecting the flue gas outlet of the boiler furnace (1) and the air inlet of the bag filter (6); The second smoke valve (72) is arranged on a pipe connecting the gas outlet of the bag filter (6) and the second smoke inlet (802); The third flue gas valve (73) is arranged on a pipeline connecting the gas outlet of the bag filter (6) and the first flue gas inlet (801).

5. A wastewater rotary drying system according to claim 1, characterized in that: Also includes a flow valve (74); The flow valve (74) is arranged on a pipeline connecting the water outlet of the wastewater buffer tank (11) and the wastewater inlet (803).

6. A wastewater rotary drying system according to claim 1, characterized in that: The ash discharge ports of the dust collector (3) and the bag dust collector (6) are connected to the ash storage warehouse pipeline.

7. A wastewater rotary drying system according to claim 2, characterized in that: The modified silica gel (806) is provided with a plurality of pores on its outer surface and inside.

8. A wastewater rotary drying system according to claim 1, characterized in that: The desulfurization device (4) is a wet desulfurization device, the flue gas is discharged to the chimney (5) through a pipeline, and the generated desulfurization wastewater is discharged to the wastewater de-turbidity device (12) through a pipeline.

9. A wastewater rotary drying system according to claim 2, characterized in that: The modified silica gel (806) uses acrylic acid, sodium sulfite and silicon oxide as raw materials; The bottom of the rotary drying tower shell (807) is made of C276 alloy.

Images