A desulfurization wastewater spray drying system

Abstract

The application provides a desulfurization wastewater spray drying system and relates to the technical field of wastewater treatment.The system comprises an atomization assembly, a wastewater conveying unit, a flue gas treatment unit and a high-pressure gas supply unit, wherein the atomization assembly is arranged in a drying tower, the atomization assembly comprises an atomization shell and a cyclone part, a partition plate is arranged in the atomization assembly, the atomization shell is divided into a spraying cavity and a cyclone cavity from top to bottom in the atomization shell, the cyclone part is rotationally arranged in the cyclone cavity, a spraying opening for connecting the spraying cavity and the cyclone cavity is arranged on the partition plate, and the spraying opening is arranged towards the cyclone part to spray and clean the surface of the cyclone part and the inner wall of the cyclone cavity.The partition plate is arranged in the atomization assembly to divide the atomization assembly into the spraying cavity and the cyclone cavity, the spraying opening is arranged towards the cyclone part, high-pressure gas is conveyed by the high-pressure gas supply unit, the crystalline salt scale adhered to the surface of the cyclone part and the inner wall of the cyclone cavity can be removed in time, and the problem of the atomization assembly blockage caused by the high salt content of the desulfurization wastewater concentrate and the easy scaling in the prior art is solved.

Description

Technical Field

[0001] This application relates to the field of wastewater, and more specifically, to a spray drying system for desulfurization wastewater. Background Technology

[0002] In industrial production sectors such as power generation, coking, and steel, wet desulfurization processes are commonly used to purify flue gas and control emissions of acidic pollutants such as sulfur dioxide. This process generates a large amount of desulfurization wastewater. This wastewater has a complex composition, containing high concentrations of chloride ions, sulfate ions, heavy metal ions, and various by-product salts. It is characterized by strong corrosiveness, high abrasiveness, high viscosity, and a strong tendency to scale. Direct discharge would cause serious damage to aquatic and soil ecosystems. Therefore, it requires advanced treatment to achieve harmless disposal or resource utilization.

[0003] Spray drying technology, with its advantages of rapid drying speed, simple operation, and rapid gas-solid separation, has been gradually applied to the solidification treatment of desulfurization wastewater, becoming an important technical path to achieve zero wastewater discharge. Its core principle is as follows: the concentrated desulfurization wastewater is transported to an atomizing component inside the drying tower. The atomizing component atomizes the wastewater into tiny droplets, and high-temperature hot air comes into full contact with these droplets, causing the water in the droplets to evaporate rapidly, ultimately forming solid crystalline salts that are discharged, thus achieving solid-liquid separation and harmless treatment of the wastewater.

[0004] As the core component of a spray drying system, the atomizing assembly's operational stability directly determines the overall treatment efficiency and continuous operation capability of the system. Existing atomizing assemblies typically consist of an atomizing shell and a swirling element within the shell. After the desulfurization wastewater concentrate enters the atomizing assembly, it is accelerated by the swirling element and then atomized and sprayed out from the atomizing nozzle. However, due to the special properties of the desulfurization wastewater concentrate, its salt content is typically as high as 10%-25%, exhibiting a strong tendency to scale. In actual operation, the aforementioned atomizing assembly suffers from significant clogging problems, severely affecting the normal operation of the system. Specific defects are as follows:

[0005] On the one hand, due to the limited atomization effect requirements, the swirling chamber space within the atomization component is compact, and dead zones easily form on the surface of the swirling element and the inner wall of the swirling chamber. During the swirling atomization process of desulfurization wastewater concentrate, water is prone to flash evaporation in the dead zones, causing a large amount of salt to crystallize and precipitate instantly. These crystalline salts will quickly adhere to the surface of the swirling element and the inner wall of the swirling chamber, forming a hard scale layer. On the other hand, the swirling element is in a rotating state during operation, and the friction between its surface and the crystalline salt scale will further aggravate the adhesion and accumulation of the scale layer. As the operating time goes by, the scale layer will continue to thicken, which will not only increase the rotational resistance of the swirling element and reduce the atomization efficiency, but also cause the flow channel of the swirling chamber to narrow, or even block the atomizing nozzle, making the atomization component unable to work properly.

[0006] To solve the aforementioned blockage problem, existing technologies typically employ periodic shutdowns for maintenance, manual cleaning, or replacement of atomizing components. This not only significantly increases equipment maintenance and labor costs but also leads to unplanned system shutdowns, severely impacting production continuity and desulfurization wastewater treatment efficiency. Summary of the Invention

[0007] The purpose of this application is to provide a desulfurization wastewater spray drying system that can solve the technical problems mentioned in the background art.

[0008] This application provides a desulfurization wastewater spray drying system, including:

[0009] An atomizing assembly is disposed within a drying tower. The atomizing assembly includes an atomizing shell and a swirling element. A partition is provided inside the atomizing assembly, which divides the atomizing shell into a spraying chamber and a swirling chamber from top to bottom. The swirling element is rotatably disposed within the swirling chamber. The partition is provided with a spray nozzle for connecting the spraying chamber and the swirling chamber. The spray nozzle is positioned towards the swirling element to spray and clean the surface of the swirling element and the inner wall of the swirling chamber. Multiple atomizing nozzles are evenly distributed on the lower periphery of the atomizing shell. The atomizing shell is also provided with a wastewater inlet communicating with the swirling chamber and a high-pressure gas inlet communicating with the spraying chamber.

[0010] A wastewater conveying unit, the output end of which is connected to the wastewater inlet, is used to convey desulfurization wastewater concentrate into the cyclone chamber;

[0011] A flue gas treatment unit is connected to the drying tower where the atomizing component is located, and is used to provide high-temperature hot gas to the drying tower and to treat the exhaust gas discharged from the drying tower.

[0012] A high-pressure gas supply unit, the output end of which is connected to the high-pressure gas inlet, is used to supply high-pressure gas into the blowing chamber. The high-pressure gas is sprayed onto the vortex component through the blowing nozzle to remove crystalline salt scale adhering to the surface of the vortex component and the inner wall of the vortex chamber.

[0013] Furthermore, a connecting column is fixedly provided at the bottom of the atomizing shell, and the swirling element is rotatably connected to the connecting column through a bearing. The wastewater inlet is located directly above the swirling element, and a transition pipe is connected to the lower end of the wastewater inlet. A blowhole is provided in the middle of the partition, and the transition pipe passes through the blowhole. There is a gap between the inner wall of the blowhole and the outer wall of the transition pipe.

[0014] Furthermore, the swirl element is a turbine or a swirl fan blade.

[0015] Furthermore, the wastewater conveying unit includes a desulfurization wastewater tank, a wastewater conveying pump, and a first electric valve, which are connected in sequence via a desulfurization wastewater conveying pipe.

[0016] Furthermore, the flue gas treatment unit includes a boiler, a denitrification reactor, an air preheater, a dust collector, and an induced draft fan. The boiler, denitrification reactor, air preheater, dust collector, and induced draft fan are connected sequentially through a main flue. The main flue between the denitrification reactor and the air preheater is connected to the flue gas inlet of the drying tower through a secondary flue. The flue gas outlet of the drying tower is connected to the main flue between the air preheater and the dust collector through an exhaust pipe.

[0017] Furthermore, the high-pressure gas control unit includes a high-pressure gas storage tank and a jet control valve, wherein the high-pressure gas storage tank, the jet control valve, and the high-pressure gas inlet are connected in sequence via a high-pressure gas delivery pipe.

[0018] Furthermore, an air distribution plate is fixed inside the drying tower, and multiple air distribution holes are evenly opened on the air distribution plate. A clearance hole is provided in the middle of the air distribution plate, and the atomizing component is disposed in the clearance hole. The flue gas inlet is connected to the auxiliary flue pipe through a first quick connector, and the high-pressure gas inlet is connected to the high-pressure gas delivery pipe through a second quick connector. The drying tower is provided with a first manhole and a second manhole. The first manhole is located above the air distribution plate, and the second manhole is located below the air distribution plate. A viewing hole is provided on the drying tower below the air distribution plate.

[0019] Furthermore, a flow guide shell is fixedly provided at the bottom of the partition, and an annular flow guide cavity is provided between the outer wall of the flow guide shell and the inner wall of the atomizing shell. An annular nozzle is provided at the bottom of the annular backflow cavity in close contact with the interior of the atomizing shell. A plurality of connecting holes communicating with the annular flow guide cavity are evenly opened on the partition.

[0020] Furthermore, the atomizing nozzle is composed of multiple inclined guide plates arranged at equal intervals around the periphery of the atomizing shell.

[0021] Furthermore, the air inlet of the high-pressure gas storage tank is connected to the hot air outlet of the air preheater through a high-pressure gas main pipe. The high-pressure gas main pipe is equipped with a check valve, an electric shut-off valve, and a high-temperature compressor in sequence in the flue gas flow direction. A high-pressure gas branch pipe is connected between the check valve and the high-pressure gas main pipe of the air preheater. A second electric valve is provided on the high-pressure gas branch pipe. An exhaust valve and a pressure sensor are provided on the high-pressure gas storage tank.

[0022] The beneficial effects of this invention are:

[0023] This invention, by setting a partition within the atomizing component to separate the spray chamber and the swirling chamber, and with the spray nozzles oriented towards the swirling component, utilizes high-pressure gas supplied by the high-pressure gas supply unit to promptly remove crystalline salt scale adhering to the surface of the swirling component and the inner wall of the swirling chamber. This fundamentally solves the problem of atomizing component clogging caused by the high salt content and easy scaling of desulfurization wastewater concentrate in existing technologies. It effectively avoids the need for frequent shutdowns for maintenance, manual cleaning, or replacement of the atomizing component due to clogging, significantly reducing equipment maintenance and labor costs, minimizing unplanned downtime, ensuring the continuous and stable operation of the entire spray drying system, and improving the treatment efficiency of desulfurization wastewater. At the same time, the multiple atomizing nozzles evenly arranged at the bottom of the atomizing shell ensure the atomization effect of the desulfurization wastewater. Combined with the synergistic effect of the flue gas treatment unit, it ensures efficient solid-liquid separation and harmless treatment of desulfurization wastewater, meeting the zero-discharge treatment requirements of desulfurization wastewater in industries such as power, coking, and steel. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a process system diagram of some embodiments of this application;

[0026] Figure 2 This is a schematic diagram of the desulfurization tower structure in some embodiments of this application;

[0027] Figure 3 This is a schematic diagram of the structure of the atomizing component in some embodiments of this application;

[0028] The reference numerals in the attached figures are as follows:

[0029] 10. Atomizing assembly; 110. Atomizing housing; 111. Connecting column; 112. Bearing; 113. Transition tube; 120. Swirl component; 130. Baffle plate; 1301. Guide shell; 1302. Connecting hole; 140. Spray chamber; 150. Swirl chamber; 160. Spray nozzle; 170. Atomizing nozzle; 180. Wastewater inlet; 190. High-pressure air inlet;

[0030] 20. Wastewater conveying unit; 210. Desulfurization wastewater tank; 220. Wastewater conveying pump; 230. First electric valve; 240. Desulfurization wastewater conveying pipe;

[0031] 30. Flue gas treatment unit; 310. Boiler; 320. Denitrification reactor; 330. Air preheater; 340. Dust collector; 350. Exhaust fan; 360. Main flue; 370. Auxiliary flue; 380. Exhaust pipe;

[0032] 40. High-pressure gas supply unit; 410. High-pressure gas storage tank; 420. Jet control valve; 430. High-pressure gas delivery pipe; 440. High-pressure gas main pipe; 441. Check valve; 442. Electric shut-off valve; 443. High-temperature compressor; 450. High-pressure gas branch pipe; 451. Second electric valve; 460. Exhaust valve; 470. Pressure sensor;

[0033] 50. Drying tower; 510. First manhole; 520. Second manhole; 530. Inspection hole; 540. Discharge valve;

[0034] 70. Air distribution panel;

[0035] 80. First quick connector;

[0036] 90. Second quick connector. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific Implementation

[0043] like Figure 1 and Figure 2As shown, this application provides a desulfurization wastewater spray drying system, including an atomizing component 10, a wastewater conveying unit 20, a flue gas treatment unit 30, and a high-pressure gas supply unit 40. The atomizing component 10 is disposed within a drying tower 50. The atomizing component 10 includes an atomizing shell 110 and a swirling element 120. A partition 130 is provided within the atomizing component 10, dividing the atomizing shell 110 into a spraying chamber 140 and a swirling chamber 150 from top to bottom. The swirling element 120 is rotatably disposed within the swirling chamber 150. The partition 130 is provided with a spray nozzle 160 for connecting the spraying chamber 140 and the swirling chamber 150. The spray nozzle 160 is positioned towards the swirling element 120 to spray and clean the surface of the swirling element 120 and the inner wall of the swirling chamber 150. The lower periphery of the housing 110 is uniformly provided with multiple atomizing nozzles 170. The atomizing housing 110 is also provided with a wastewater inlet 180 communicating with the swirl chamber 150 and a high-pressure gas inlet 190 communicating with the spray chamber 140. The output end of the wastewater conveying unit 20 is connected to the wastewater inlet 180 and is used to convey desulfurization wastewater concentrate into the swirl chamber 150. The flue gas treatment unit 30 is connected to the drying tower 50 where the atomizing component 10 is located and is used to provide high-temperature hot gas to the drying tower 50 and to treat the exhaust gas discharged from the drying tower 50. The output end of the high-pressure gas supply unit 40 is connected to the high-pressure gas inlet 190 and is used to convey high-pressure gas into the spray chamber 140. The high-pressure gas is sprayed onto the swirl element 120 through the spray nozzle 160 to remove impurities from the surface of the swirl element 120. The crystalline salt scale adhering to the surface and inner wall of the swirl chamber 150; the wastewater conveying unit 20 conveys the desulfurization wastewater concentrate to the swirl chamber 150 of the atomizing component 10 through the wastewater inlet 180; the flue gas treatment unit 30 provides high-temperature hot gas to the drying tower 50 and is responsible for treating the exhaust gas discharged from the drying tower 50; the swirl element 120 rotates in the swirl chamber 150, swirling and accelerating the desulfurization wastewater concentrate entering the swirl chamber 150, and atomizing it into tiny droplets through multiple atomizing nozzles 170 evenly arranged on the lower periphery of the atomizing shell 110. The atomized droplets fully contact the high-temperature hot gas in the drying tower 50, realizing rapid evaporation of water and forming solid crystalline salt that is discharged; at the same time, the high-pressure gas supply unit 40 conveys high-pressure gas to the atomizing component 10 through the high-pressure gas inlet 190. In the blowing chamber 140 of the atomizing component 10, high-pressure gas is ejected through the blowing nozzle 160 on the baffle 130 facing the swirling element 120, directly blowing and cleaning the surface of the swirling element 120 and the inner wall of the swirling chamber 150, promptly removing the attached crystalline salt scale, and ensuring the stable operation of the atomizing component 10; by setting the baffle 130 in the atomizing component 10 to separate the blowing chamber 140 and the swirling chamber 150, and with the structure of the blowing nozzle 160 facing the swirling element 120, the high-pressure gas delivered by the high-pressure gas supply unit 40 can promptly remove the crystalline salt scale attached to the surface of the swirling element 120 and the inner wall of the swirling chamber 150, fundamentally solving the problem of clogging of the atomizing component 10 caused by the high salt content and easy scaling of the desulfurization wastewater concentrate in the prior art;This effectively avoids frequent shutdowns for maintenance, manual cleaning, or replacement of the atomizing component 10 due to blockages, significantly reducing equipment maintenance and labor costs, minimizing unplanned downtime, ensuring continuous and stable operation of the entire spray drying system, and improving the efficiency of desulfurization wastewater treatment. Simultaneously, the multiple atomizing nozzles 170 evenly distributed at the lower part of the atomizing shell 110 ensure effective atomization of the desulfurization wastewater. Combined with the synergistic effect of the flue gas treatment unit 30, this ensures efficient solid-liquid separation and harmless treatment of the desulfurization wastewater, meeting the zero-discharge treatment requirements of desulfurization wastewater in industries such as power generation, coking, and steel.

[0044] like Figure 1 and Figure 2 As shown, a connecting column 111 is fixedly installed at the bottom of the atomizing housing 110. The cyclone element 120 is rotatably connected to the connecting column 111 via a bearing 112. The wastewater inlet 180 is located directly above the cyclone element 120. A transition pipe 113 is connected to the lower end of the wastewater inlet 180. A spray hole is provided in the middle of the baffle 130. The transition pipe 113 passes through the spray hole, and there is a gap between the inner wall of the spray hole and the outer wall of the transition pipe 113. The positional design of the wastewater inlet 180 and the transition pipe 113, as well as the cooperation between the transition pipe 113 and the spray hole, allows the desulfurization wastewater to be directly transported to the cyclone element 120. The desulfurization wastewater or When high-pressure air impacts the cyclone element 120, the cyclone element 120 can rotate. After the cyclone element 120 rotates, the desulfurization wastewater or high-pressure air will scour the inner wall of the cyclone chamber 150 under the action of centrifugal force, which can improve the cyclone atomization efficiency and the efficiency of crystallized scale removal. The gap design between the spray hole and the transition pipe 113 solves the compatibility problem between the spray channel and the wastewater conveying channel, improves the comprehensiveness and efficiency of crystallized scale removal, and does not hinder the normal conveying of wastewater. It further optimizes the anti-clogging effect, reduces the frequency of equipment downtime for maintenance, lowers maintenance costs, and ensures the continuous and stable operation of the entire spray drying system.

[0045] like Figure 2 As shown, the swirl element 120 is a turbine or a swirl fan blade; the blade structure of the turbine or swirl fan blade can significantly improve the swirl intensity and atomization uniformity of the desulfurization wastewater concentrate, optimize the atomization particle size, and improve the drying efficiency. In this embodiment, the swirl element 120 is a turbine.

[0046] like Figure 1 and Figure 2As shown, the wastewater conveying unit 20 includes a desulfurization wastewater tank 210, a wastewater conveying pump 220, and a first electric valve 230. The desulfurization wastewater tank 210, the wastewater conveying pump 220, the first electric valve 230, and the wastewater inlet 180 are connected in sequence through a desulfurization wastewater conveying pipe 240. The desulfurization wastewater tank 210 stores desulfurization wastewater concentrate. After the system is started, the wastewater conveying pump 220 conveys the desulfurization wastewater concentrate stably to the wastewater inlet 180 of the atomizing component 10 through the desulfurization wastewater conveying pipe 240 and the first electric valve 230 connected in sequence. The first electric valve 230 can be precisely started and stopped and the conveying flow rate can be adjusted as needed. With the power output of the wastewater conveying pump 220, the desulfurization wastewater concentrate can be controllably supplied to the vortex chamber 150.

[0047] like Figure 1 As shown, the flue gas treatment unit 30 includes a boiler 310, a denitrification reactor 320, an air preheater 330, a dust collector 340, and an induced draft fan 350. The boiler 310, denitrification reactor 320, air preheater 330, dust collector 340, and induced draft fan 350 are sequentially connected via a main flue 360. The main flue 360 ​​between the denitrification reactor 320 and the air preheater 330 is connected to the flue gas inlet of the drying tower 50 via a secondary flue 370. The flue gas outlet of the drying tower 50 is connected to the main flue 360 ​​between the air preheater 330 and the dust collector 340 via an exhaust pipe 380. The flue gas generated by the boiler 310 flows sequentially through the denitrification reactor 320, air preheater 330, dust collector 340, and induced draft fan 350 via the main flue 360, completing denitrification, preheating, and dust removal treatments before being discharged. The denitrification reactor 320 and the air preheater 340 are connected via a secondary flue 370. The high-temperature flue gas in the main flue 360 ​​between the air preheater 330 and the dust collector 340 is transported to the flue gas inlet of the drying tower 50 through the auxiliary flue 370. This provides the necessary high-temperature heat gas for the atomization and drying of the desulfurization wastewater concentrate in the drying tower 50, helping the water droplets in the wastewater to evaporate and form solid crystalline salts. The exhaust gas after heat exchange in the drying tower 50 passes through the exhaust pipe 380 through the flue gas outlet of the drying tower 50 and merges into the main flue 360 ​​between the air preheater 330 and the dust collector 340. After merging with the flue gas in the main flue 360, they enter the dust collector 340 for further dust removal and are finally discharged by the induced draft fan 350. Through the reasonable layout of the main flue 360, the auxiliary flue 370 and the exhaust pipe 380, the flue gas of the boiler 310 is utilized in stages. The high-temperature flue gas after denitrification and before air preheating is introduced into the drying tower 50 as a heat source, eliminating the need for additional heating equipment, saving energy and meeting the requirements of energy conservation and consumption reduction.

[0048] like Figure 1 and Figure 2As shown, the high-pressure gas control unit includes a high-pressure gas storage tank 410 and a jet control valve 420. The high-pressure gas storage tank 410, the jet control valve 420, and the high-pressure gas inlet 190 are connected in sequence via a high-pressure gas delivery pipe 430. The high-pressure gas storage tank 410 is used to store high-pressure gas and provide a stable gas source for jet cleaning. When the system is running, the high-pressure gas in the high-pressure gas storage tank 410 flows through the high-pressure gas delivery pipe 430, through the jet control valve 420, and is finally delivered to the high-pressure gas inlet 190 of the atomizing component 10, enters the jet chamber 140, and is ejected from the jet hole to achieve timely cleaning of crystallized scale.

[0049] like Figure 2 As shown, a distribution plate 70 is fixedly installed inside the drying tower 50. Multiple distribution holes are evenly distributed on the distribution plate 70. A clearance hole is provided in the center of the distribution plate 70, and the atomizing component 10 is disposed within the clearance hole. The flue gas inlet is connected to the auxiliary flue pipe via a first quick connector 80, and the high-pressure gas inlet 190 is connected to the high-pressure gas delivery pipe 430 via a second quick connector 90. The drying tower 50 is provided with a first manhole 510 and a second manhole 520. The first manhole 510 is located above the distribution plate 70, and the second manhole 520 is located below the distribution plate 70. A viewing hole 53 is provided below the distribution plate 70 on the drying tower 50. The bottom of the drying tower 50 is equipped with a discharge valve 540; the air distribution plate 70 and the evenly distributed air distribution holes can make the high-temperature flue gas evenly fill the interior of the drying tower 50, improve the contact efficiency between the flue gas and the atomized wastewater droplets, and optimize the drying effect. The setting of the first quick connector 80 and the second quick connector 90 simplifies the connection process between the flue gas and high-pressure gas conveying pipes 430 and the drying tower 50, and facilitates the disassembly, inspection and maintenance of the pipelines; the inspection hole 530 can realize real-time monitoring of the equipment operating status, which can facilitate timely detection and handling of faults; the setting of the first manhole 510 and the second manhole 520 facilitates the maintenance of personnel.

[0050] like Figure 2 As shown, a guide shell 1301 is fixedly provided at the bottom of the partition 130. An annular guide cavity is provided between the outer wall of the guide shell 1301 and the inner wall of the atomizing shell 110. An annular nozzle is provided at the bottom of the annular backflow cavity, which is close to the inside of the atomizing shell 110. A plurality of connecting holes 1302 that communicate with the annular guide cavity are evenly opened on the partition 130. The high-pressure gas supplied by the high-pressure gas supply unit 40 to the spraying chamber 140 enters the annular guide cavity simultaneously through the plurality of connecting holes 1302 evenly opened on the partition 130. The annular guide cavity plays a buffering and diversion role for the high-pressure gas, so that the high-pressure gas is evenly distributed in the cavity. Then, through the annular nozzle provided at the bottom of the annular guide cavity, which is close to the inner wall of the atomizing shell 110, the gas is sprayed out annularly along the inner wall of the atomizing shell 110. This works in conjunction with the spraying action of the original spraying port 160 on the swirling component 120 to achieve all-round spraying cleaning of the surface of the swirling component 120 and the inner wall of the atomizing shell 110.

[0051] like Figure 2 and Figure 3 As shown, the atomizing nozzle 170 is composed of multiple inclined guide plates arranged at equal intervals around the periphery of the atomizing shell 110. After the swirling element 120 in the swirling chamber 150 drives the desulfurization wastewater concentrate to swirl at high speed to form a swirling field, the wastewater will flow to the lower periphery of the atomizing shell 110. Guided by the multiple inclined guide plates, it will be sprayed out at high speed along the inclined direction of the guide plates at a preset angle. At the same time, combined with the feature of the guide plates being arranged at equal intervals, the sprayed wastewater forms a uniform annular atomized airflow, which fully contacts the high-temperature hot air evenly distributed by the air distribution plate 70 in the drying tower 50, realizing the rapid evaporation and solid-liquid separation of the wastewater droplets. The setting of multiple inclined guide plates enhances the swirling intensity when the wastewater is sprayed out and optimizes the atomized particle size.

[0052] like Figure 1 As shown, the inlet of the high-pressure gas storage tank 410 is connected to the hot gas outlet of the air preheater 330 via the high-pressure gas main pipe 440. The high-pressure gas main pipe 440 is equipped with a check valve 441, an electric shut-off valve 442, and a high-temperature compressor 443 in sequence along the flue gas flow direction. A high-pressure gas branch pipe 450 connects the check valve 441 to the air preheater 330 via the high-pressure gas main pipe 440. A second electric valve 451 is installed on the high-pressure gas branch pipe 450. The high-pressure gas storage tank 410 has an exhaust valve 460 and a pressure sensor 470. The hot gas discharged from the air preheater 330 serves as the high-pressure gas source, flowing along the high-pressure gas main pipe 440 in a preset direction, passing sequentially through the check valve 441, the electric shut-off valve 442, and the high-temperature compressor 443. After being compressed and pressurized by the high-temperature compressor 443, it is delivered to the high-pressure gas storage tank 410 for storage. The check valve 441 prevents backflow of high-pressure gas, and the electric shut-off valve 442 can control the high-pressure gas main pipe 440 as needed. The high-pressure gas branch pipe 450 is connected at one end to the high-pressure gas main pipe 440 between the check valve 441 and the air preheater 330, and at the other end, it can be used to connect a backup gas source or release pressure. The second electric valve 451 controls the opening and closing of the high-pressure gas branch pipe 450. The pressure sensor 470 on the high-pressure gas storage tank 410 monitors the gas pressure inside the tank in real time. The exhaust valve 460 can be opened to release pressure when the gas pressure inside the tank is too high or during maintenance, ensuring a stable gas supply to the high-pressure gas storage tank 410 and providing a reliable gas source support for the blowing and cleaning of the atomizing component 10. The high-pressure gas storage tank 410 is equipped with a heat insulation layer. The hot air discharged from the air preheater 330 itself has a certain temperature. When blowing, it can heat and soften the crystalline salt scale on the surface of the swirling component 120, the inner wall of the swirling cavity 150, and the atomizing nozzle 170. Combined with the impact force of the high-pressure airflow, it can remove stubborn scale more efficiently. Compared with normal temperature gas blowing, the cleaning is more thorough and further reduces the risk of blockage.

[0053] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A desulfurization wastewater spray drying system, characterized in that, include: An atomizing assembly is disposed within a drying tower. The atomizing assembly includes an atomizing shell and a swirling element. A partition is provided inside the atomizing assembly, which divides the atomizing shell into a spraying chamber and a swirling chamber from top to bottom. The swirling element is rotatably disposed within the swirling chamber. The partition is provided with a spray nozzle for connecting the spraying chamber and the swirling chamber. The spray nozzle is positioned towards the swirling element to spray and clean the surface of the swirling element and the inner wall of the swirling chamber. Multiple atomizing nozzles are evenly distributed on the lower periphery of the atomizing shell. The atomizing shell is also provided with a wastewater inlet communicating with the swirling chamber and a high-pressure gas inlet communicating with the spraying chamber. A wastewater conveying unit, the output end of which is connected to the wastewater inlet, is used to convey desulfurization wastewater concentrate into the cyclone chamber; A flue gas treatment unit is connected to the drying tower where the atomizing component is located, and is used to provide high-temperature hot gas to the drying tower and to treat the exhaust gas discharged from the drying tower. A high-pressure gas supply unit, the output end of which is connected to the high-pressure gas inlet, is used to supply high-pressure gas into the blowing chamber. The high-pressure gas is sprayed onto the vortex component through the blowing nozzle to remove crystalline salt scale adhering to the surface of the vortex component and the inner wall of the vortex chamber.

2. The desulfurization wastewater spray drying system according to claim 1, characterized in that: A connecting column is fixedly provided at the bottom of the atomizing shell. The swirling element is rotatably connected to the connecting column through a bearing. The wastewater inlet is located directly above the swirling element. A transition pipe is connected to the lower end of the wastewater inlet. A blow hole is provided in the middle of the partition. The transition pipe passes through the blow hole. There is a gap between the inner wall of the blow hole and the outer wall of the transition pipe.

3. The desulfurization wastewater spray drying system according to claim 2, characterized in that: The swirling element is a turbine or a swirling fan blade.

4. The desulfurization wastewater spray drying system according to claim 3, characterized in that: The wastewater conveying unit includes a desulfurization wastewater tank, a wastewater conveying pump, and a first electric valve. The desulfurization wastewater tank, the wastewater conveying pump, the first electric valve, and the wastewater inlet are connected in sequence through a desulfurization wastewater conveying pipe.

5. The desulfurization wastewater spray drying system according to claim 1, characterized in that: The flue gas treatment unit includes a boiler, a denitrification reactor, an air preheater, a dust collector, and an induced draft fan. The boiler, denitrification reactor, air preheater, dust collector, and induced draft fan are connected sequentially through a main flue. The main flue between the denitrification reactor and the air preheater is connected to the flue gas inlet of the drying tower through a secondary flue. The flue gas outlet of the drying tower is connected to the main flue between the air preheater and the dust collector through an exhaust pipe.

6. The desulfurization wastewater spray drying system according to claim 5, characterized in that: The high-pressure gas control unit includes a high-pressure gas storage tank and a jet control valve, which are connected in sequence to the high-pressure gas inlet via a high-pressure gas delivery pipe.

7. The desulfurization wastewater spray drying system according to claim 6, characterized in that: The drying tower is equipped with an air distribution plate, on which multiple air distribution holes are evenly distributed. A clearance hole is provided in the middle of the air distribution plate, and the atomizing component is disposed in the clearance hole. The flue gas inlet is connected to the auxiliary flue pipe through a first quick connector, and the high-pressure gas inlet is connected to the high-pressure gas delivery pipe through a second quick connector. The drying tower is provided with a first manhole and a second manhole. The first manhole is located above the air distribution plate, and the second manhole is located below the air distribution plate. A viewing hole is provided on the drying tower below the air distribution plate.

8. The desulfurization wastewater spray drying system according to claim 7, characterized in that: The bottom of the partition is fixed with a flow guide shell, and an annular flow guide cavity is provided between the outer wall of the flow guide shell and the inner wall of the atomizing shell. The bottom of the annular backflow cavity is provided with an annular nozzle close to the inside of the atomizing shell. The partition is evenly provided with a plurality of connecting holes that communicate with the annular flow guide cavity.

9. The desulfurization wastewater spray drying system according to claim 1, characterized in that: The atomizing nozzle is composed of multiple inclined guide plates arranged at equal intervals around the periphery of the atomizing shell.

10. The desulfurization wastewater spray drying system according to claim 6, characterized in that: The air inlet of the high-pressure gas storage tank is connected to the hot gas outlet of the air preheater through the high-pressure gas main pipe. The high-pressure gas main pipe is equipped with a check valve, an electric shut-off valve and a high-temperature compressor in sequence in the flue gas flow direction. The high-pressure gas main pipe between the check valve and the air preheater is connected to a high-pressure gas branch pipe. A second electric valve is provided on the high-pressure gas branch pipe. The high-pressure gas storage tank is equipped with an exhaust valve and a pressure sensor.

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