Desulfurization wastewater zero-discharge drying system based on rotary atomization and Venturi

Abstract

The utility model discloses a desulfurization wastewater zero-discharge drying system based on rotary atomization and Venturi, which belongs to the technical field of wastewater desulfurization and comprises a first booster fan, a bypass flue, a drying tower, a Venturi ejector and a rotary atomizer, the bypass flue is connected with a boiler main flue in parallel, and the drying tower, the Venturi ejector and the rotary atomizer are positioned on the bypass flue. An inlet of the bypass flue is located between the boiler and the air pre-heater, an outlet of the bypass flue is located between the air pre-heater and the dust remover, and the drying tower is communicated with the desulfurizing tower located on the main flue. The Venturi jet device is provided with a gas inlet end, a gas outlet end and an injection end, the gas inlet end is communicated with an outlet flue of the drying tower, and the gas outlet end is communicated with an inlet flue of the dust remover; one end of the first booster fan is communicated with an outlet flue of the dust remover, and the other end of the first booster fan is communicated with the injection end; the rotary atomizer is located at the top of the drying tower and used for mixing flue gas from the bypass flue with desulfurization wastewater from the desulfurization tower, and the flowing directions of the flue gas and wastewater fog drops are the same. And zero discharge of wastewater is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater desulfurization, and relates to a desulfurization wastewater zero-discharge drying system based on rotary atomization and Venturi. Background Art

[0002] In industrial development, the national environmental protection department advocates that industrial enterprises strictly implement desulfurization waste liquid drying technology to achieve zero emission goals.

[0003] In the implementation of the existing desulfurization waste liquid drying technology, when the boiler is started and operated at full load, the air preheater resistance is large, and the high-temperature flue gas discharged from the boiler bypasses the air preheater and flows along the bypass flue to the drying tower. At the same time, the wastewater (desulfurization waste liquid) treated by the desulfurization tower is introduced into the drying tower, and the wastewater is atomized by the atomizer to form wastewater droplets. In the initial operation, the high-temperature flue gas dries the wastewater droplets, thereby achieving flue gas cooling and zero wastewater discharge. After a period of time, since the flue gas that has not been treated by the dust collector contains a large amount of dust, the droplets are entrained by the flue gas to the inner circle flue gas negative pressure area of ​​the hot air (flue gas) distributor on the top of the atomizer, and dry to form crystals that block the hot air distributor, thereby affecting the flue gas flow field distribution in the entire drying tower, and ultimately causing serious dust accumulation at the bottom of the tower and the system cannot operate.

[0004] When the boiler is started and runs at low load, the resistance of the air preheater is small, and most of the high-temperature flue gas discharged from the boiler flows along the main flue in sequence through the air preheater, induced draft fan, dust collector, desulfurization tower, and is finally discharged through the chimney. Only a small amount of flue gas bypasses the air preheater and flows along the bypass flue to the drying tower to mix with wastewater (desulfurization waste liquid). Although water enters the atomizer, the wastewater droplets cannot be completely evaporated due to the small flue gas flow, causing the wastewater to flow directly into the bottom of the tower, resulting in a wet bottom phenomenon and causing blockage of the drying tower.

[0005] Therefore, it is necessary to provide a desulfurization wastewater zero-emission drying system that can increase the air intake volume of the drying tower when the boiler is running at low load. Utility Model Content

[0006] In order to at least solve the problem in the prior art that when the boiler is running at low load, the air intake of the drying tower is insufficient, resulting in wastewater directly flowing into the bottom of the tower and causing a wet bottom phenomenon, the utility model provides the following technical solutions: a zero-emission drying system for desulfurized wastewater based on rotary atomization and Venturi, comprising: a bypass flue connected in parallel with the main flue of the boiler, the inlet of the bypass flue is located between the boiler and the air preheater, and the outlet of the bypass flue is located between the air preheater and the dust collector, and also includes: a first booster fan and a drying tower, a Venturi ejector, and a rotary atomizer located on the bypass flue;

[0007] The drying tower is connected to the desulfurization tower located on the main flue;

[0008] The venturi ejector has an air inlet end, an air outlet end and an ejection end, the air inlet end is connected to the outlet flue of the drying tower, the air outlet end is connected to the inlet flue of the dust collector, and the venturi ejector is used to inject the flue gas passing through the drying tower into the dust collector;

[0009] One end of the first booster fan is connected to the outlet flue of the dust collector, and the other end of the first booster fan is connected to the ejection end;

[0010] The rotary atomizer is located at the top of the drying tower and is used to mix the flue gas from the bypass flue with the desulfurization wastewater from the desulfurization tower. The flue gas and wastewater droplets have the same flow direction in the rotary atomizer.

[0011] Optionally, in the above-mentioned zero-discharge drying system for desulfurized wastewater based on rotary atomization and Venturi, the rotary atomizer is in a conical column shape, comprising: an inner ring, an outer ring, a main shaft, an atomizing nozzle and a motor;

[0012] One end of the main shaft is connected to the output shaft of the motor;

[0013] The inner ring is sleeved on the main shaft, the inner ring is connected to the main shaft, and one end of the inner ring is provided with the atomizing nozzle;

[0014] The outer ring is sleeved on the inner ring, and the outer ring is connected via a plurality of guide plates arranged along the circumferential outer wall of the inner ring. The guide plates are arranged at an angle with the horizontal plane to change the flow direction of the smoke.

[0015] Optionally, in the above-mentioned zero-emission drying system for desulfurization wastewater based on rotary atomization and Venturi, the wastewater discharged from the desulfurization tower is transported to the drying tower through a drainage pipe after desulfurization treatment.

[0016] Optionally, in the above-mentioned zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi, the Venturi ejector is a sleeve, comprising: an inner tube and an outer tube;

[0017] The air inlet end of the outer tube is connected to the outlet flue of the drying tower, and the air outlet end of the outer tube is connected to the inlet flue of the dust collector;

[0018] The ejection end of the inner tube is connected to the outlet flue of the first booster fan, and the air outlet end of the inner tube extends into the outer tube.

[0019] Optionally, in the above-mentioned zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi, the outer tube comprises: a first convergent tube, a first nozzle tube and a first expansion tube;

[0020] The diameter of the first reducer gradually decreases along the direction of smoke flow;

[0021] One end of the first nozzle tube is connected to the air outlet end of the first reducer tube, and the other end of the first nozzle tube is connected to the air inlet end of the first expander tube;

[0022] The diameter of the first expansion tube gradually increases along the direction of smoke flow.

[0023] Optionally, in the above-mentioned zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi, the inner pipe comprises: an elbow pipe, a second reducer pipe and a second nozzle pipe;

[0024] The elbow pipe is fixed in the outlet flue of the drying tower, and one end of the elbow pipe is connected to the outlet flue of the first booster fan;

[0025] The diameter of the second reducer gradually decreases along the direction of smoke flow, one end of the second reducer is connected to the elbow pipe, the other end of the second reducer is connected to the air inlet end of the second nozzle pipe, and the other end of the second reducer and the second nozzle pipe are both located inside the air inlet end of the outer pipe.

[0026] Optionally, in the above-mentioned zero-emission drying system for desulfurization wastewater based on rotary atomization and Venturi, a wear-resistant layer is provided on the inner walls of the first reducer and the first nozzle tube.

[0027] Optionally, in the above-mentioned zero-emission drying system for desulfurization wastewater based on rotary atomization and Venturi, a wear-resistant layer is provided on the outer wall of the windward side of the elbow pipe.

[0028] Optionally, in the above-mentioned zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi, the zero-discharge drying system for desulfurization wastewater further comprises: a pressure transmitter;

[0029] The pressure transmitter is located on the bypass flue at both sides of the Venturi ejector and is used to measure the pressure at both ends of the Venturi ejector.

[0030] Optionally, in the above-mentioned zero-emission drying system for desulfurization wastewater based on rotary atomization and Venturi, the zero-emission drying system for desulfurization wastewater also includes: a second booster fan arranged in parallel with the first booster fan, and the first booster fan and the second booster fan are switched by a valve on the flue.

[0031] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0032] The present application installs a rotary atomizer on the top of a drying tower, installs a venturi ejector as a power device between the drying tower and the dust collector, and adds a first booster fan between the ejector end of the venturi ejector and the outlet flue of the dust collector to extract a proper amount of clean flue gas as a driving source for the venturi ejector, thereby increasing the negative pressure at the outlet of the drying tower and increasing the air intake of the drying tower. The rotary atomizer uses the high-temperature flue gas to atomize the desulfurization wastewater, and the wastewater droplets are mixed with the high-temperature flue gas to form dry and low-temperature exhaust gas, thereby achieving the purpose of zero discharge of desulfurization wastewater and solving the problem that the wastewater that has not yet evaporated directly flows into the bottom of the tower due to insufficient air intake of the drying tower, resulting in a wet bottom phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of a desulfurization waste liquid drying system in the prior art;

[0034] Figure 2 A schematic diagram of a zero-emission drying system for desulfurization wastewater based on rotary atomization and Venturi provided in an embodiment of the utility model;

[0035] Figure 3 for Figure 2 Schematic diagram of the specific structure of the Venturi ejector;

[0036] Figure 4 for Figure 2 A schematic diagram of the specific structure of the rotary atomizer;

[0037] In the figure: 1. Drying tower; 2. Venturi ejector; 201. First convergent pipe; 202. First nozzle pipe; 203. First expansion pipe; 204. Elbow pipe; 205. Second convergent pipe; 206. Second nozzle pipe; 3. First booster fan; 4. Rotary atomizer; 401. Inner ring; 402. Outer ring; 403. Main shaft; 404. Motor; 405. Guide plate; 406. Atomizing nozzle; 5. Air preheater; 6. Dust collector; 7. Reinforcement plate; 8. Wear-resistant layer; 9. Exit flue of drying tower; 10. Exit flue of booster fan; 11. Main flue; 12. Bypass flue; 13. Second booster fan. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0040] See also Figure 2-4 The utility model provides the following technical solutions: a zero-emission drying system for desulfurization wastewater based on rotary atomization and Venturi, the system comprising: a bypass flue 12, a first booster fan 13, and a drying tower 1, a Venturi ejector 2 and a rotary atomizer 4 installed on the bypass flue 12.

[0041] Specifically, the bypass flue 12 is arranged in parallel with the boiler main flue 11 (see Figure 1As shown), the inlet of the bypass flue 12 is located between the boiler and the air preheater 5, and the outlet of the bypass flue 12 is located between the air preheater 5 and the dust collector 6 (such as an electrostatic precipitator ESP). The drying tower 1 is connected to the desulfurization tower located on the main flue 11, so that the desulfurized wastewater in the desulfurization tower can flow into the drying tower 1. The venturi ejector 2 has an air inlet end, an air outlet end and an ejector end. The air inlet end is connected to the outlet flue 9 of the drying tower, and the air outlet end is connected to the inlet flue of the dust collector 6. The venturi ejector 2 is made using the Venturi principle. When the boiler is running at low load, the venturi ejector 2 is used as a driving device to inject the flue gas passing through the drying tower 1 into the dust collector 6 of the main flue 11. Preferably, the outlet flue 9 of the drying tower is located above the lower cone hopper of the drying tower 1. One end of the first booster fan 3 is connected to the outlet flue of the dust collector 6, and the other end of the first booster fan 3 is connected to the ejection end of the venturi ejector 2. The first booster fan 3 is used to introduce a part of the clean flue gas purified by the dust collector 6 into the venturi ejector 2 as a driving source, thereby increasing the driving force of the venturi ejector 2. The rotary atomizer 4 is located at the top of the drying tower 1, and is used to mix the flue gas from the bypass flue 12 with the desulfurization wastewater from the desulfurization tower. Further preferably, the wastewater discharged from the desulfurization tower is transported to the drying tower 1 through a drainage pipe after desulfurization treatment. When the boiler is running at low load, the Venturi ejector 2 is started. Initially, a small amount of high-temperature flue gas flows into the drying tower 1 along the bypass flue 12. The rotary atomizer 4 on the top of the drying tower 1 rotates at a high speed to generate a flue gas negative pressure zone inside, attracting more flue gas into the rotary atomizer 4. The flue gas flow rate increases, and the flue gas presses down the atomizer (the atomizer is located in the atomizing nozzle 406) to atomize the desulfurization wastewater from the desulfurization tower and spray it out through the atomizing nozzle 406. At this time, the wastewater droplets and the high-temperature flue gas have the same flow direction in the rotary atomizer 4. At the same time, the high-temperature flue gas mixes with the wastewater droplets, and the wastewater droplets are evaporated to form exhaust gas (which can also be understood as dry low-temperature flue gas). The exhaust gas enters the Venturi ejector along the outlet flue 9 of the drying tower 1. In the device 2, the negative pressure area in the venturi ejector 2 produces an adsorption effect on the exhaust gas, attracting more flue gas to enter the drying tower 1 to form exhaust gas, and at the same time starting the first booster fan 3, the first booster fan 3 extracts an appropriate amount of clean flue gas purified by the dust collector 6, and the clean flue gas flows into the venturi ejector 2 as a driving source, further increasing the driving force of the venturi ejector 2, increasing the negative pressure at the outlet of the drying tower 1, thereby increasing the air intake (flue gas) of the drying tower 1, and a continuous flow of high-temperature flue gas enters the rotary atomizer 4 to mix with the desulfurization wastewater, and the desulfurization wastewater is completely evaporated, achieving the purpose of zero discharge of desulfurization wastewater, and solving the problem that the wastewater that has not yet evaporated directly flows into the bottom of the tower due to insufficient air intake of the drying tower 1, resulting in a wet bottom phenomenon. The rotary atomizer 4 can be a rotary atomizer 4 in the prior art, and this embodiment does not limit the specific structure of the rotary atomizer 4.

[0042] Reference Figure 4As shown in the figure, as an embodiment of the specific structure of the above-mentioned rotary atomizer, in this embodiment, the rotary atomizer 4 is in a conical columnar shape, including: an inner ring 401, an outer ring 402, a main shaft 403, an atomizing nozzle 406 and a motor 404. One end of the main shaft 403 is connected to the output shaft of the motor 404, so that the motor 404 can drive the motor 404 to rotate. The inner ring 401 is sleeved on the main shaft 403, and the inner ring 401 is connected to the main shaft 403, so that the inner ring 401 can rotate in the same direction as the main shaft 403. An atomizing nozzle 406 (i.e., a nozzle with a built-in atomizer) is provided at one end of the inner ring 401. Since the atomizer is a commonly used device in the art, it can realize the atomization function, and this embodiment does not limit its specific structure. The outer ring 402 is sleeved on the inner ring 401, and the outer ring 402 is connected through a plurality of guide plates 405 arranged along the circumferential outer wall of the inner ring 401, so that the outer ring 402 can rotate in the same direction as the inner ring 401. These guide plates 405 are arranged at an angle (inclined) to the horizontal plane, so that the flow direction of the smoke can be changed. The guide plates 405 are arranged at intervals to form a plurality of smoke channels. When the boiler is running at low load, the venturi ejector 2 is started. Initially, a small amount of high-temperature flue gas flows into the drying tower 1 along the bypass flue 12, and flows into the inner and outer rings of the rotary atomizer 4. The outer ring flue gas flow rate is higher than the inner ring flue gas flow rate. The rotary atomizer 4 rotates at high speed to generate a flue gas negative pressure zone between the inner and outer rings, attracting more flue gas into the rotary atomizer 4, and the flue gas flow rate increases. The flue gas in the inner ring presses down the atomizer in the nozzle, and the atomizer atomizes the desulfurization wastewater from the desulfurization tower and sprays it through the atomizing nozzle 406. The wastewater droplets evaporate after mixing with the high-temperature flue gas. It should be noted that since the high-temperature flue gas carries some dust, the flue gas flow rate increases as the axial cross-section of the rotary atomizer 4 becomes smaller, thereby preventing dust from settling in the drying tower 1 and the flue.

[0043] As an embodiment of the specific structure of the above-mentioned venturi ejector 2, in this embodiment, the venturi ejector 2 is a sleeve, including: an inner tube and an outer tube. The air inlet end of the outer tube is connected to the outlet flue 9 of the drying tower 1, and the air outlet end of the outer tube is connected to the inlet flue of the dust collector 6. The ejection end of the inner tube is connected to the outlet flue 10 of the first booster fan 3, and the air outlet end of the inner tube extends into the outer tube, and the inner tube is used to increase the driving force of the outer tube. When the boiler is running at low load, part of the high-temperature flue gas discharged from the boiler bypasses the air preheater 5 and flows into the drying tower 1 along the bypass flue 12. The rotary atomizer 4 atomizes the desulfurization wastewater from the desulfurization tower and mixes it with the high-temperature flue gas to form dry exhaust gas. The exhaust gas flows into the outer tube through the outlet flue 9 of the drying tower 1. The negative pressure area in the outer tube produces an adsorption effect on the exhaust gas, thereby attracting more flue gas to enter the drying tower 1 to form exhaust gas. After the exhaust gas passes through the outer tube, it flows into the inlet flue of the dust collector 6. After starting the first booster fan 3, the first booster fan 3 extracts a small amount of clean flue gas filtered by the dust collector 6. The clean flue gas flows into the inner tube along the flue, and is ejected into the outer tube by the inner tube as a driving source, and then is ejected into the inlet flue of the dust collector 6 by the outer tube. It should be noted that both the inner tube and the outer tube are designed according to the Venturi principle, and there is a negative pressure area inside each. This embodiment does not limit its specific structure.

[0044] Reference Figure 3As shown, the outer tube includes: a first reducer 201, a first nozzle 202 and a first expansion tube 203. The diameter of the first reducer 201 gradually decreases along the direction of the flue gas flow, so that the flow rate (and air pressure) of the flue gas increases as the cross section of the first reducer 201 decreases, and a pressure difference is generated at both ends of the first reducer 201, which produces a certain adsorption effect on the approaching flue gas, attracting more flue gas to gather, thereby increasing the air intake of the drying tower 1. One end of the first nozzle 202 is connected to the outlet end of the first reducer 201, and the other end of the first nozzle 202 is connected to the inlet end of the first expansion tube 203, so that the high-pressure flue gas flowing out of the first reducer 201 quickly flows into the first expansion tube 203 through the first nozzle 202. The diameter of the first expansion tube 203 gradually increases along the direction of the flue gas flow, so that the flow rate (and air pressure) of the high-pressure flue gas can be reduced as the cross section increases, thereby avoiding the impact force of the high-pressure flue gas on the inner wall of the flue. The inner tube includes: an elbow tube 204, a second tapered tube 205 and a second nozzle tube 206. The elbow tube 204 is fixed in the outlet flue 9 of the drying tower 1. For example, four reinforcing plates 7 are arranged around the elbow tube 204. The elbow tube 204 is connected to the inner wall of the flue through the reinforcing plates 7. One end of the elbow tube 204 is connected to the outlet flue 10 of the first booster fan 3. In this way, the first booster fan 3 can discharge the clean flue gas filtered by the dust collector 6 into the elbow tube 204. The diameter of the second reducer 205 gradually decreases along the direction of the flue gas flow. One end of the second reducer 205 is connected to the elbow pipe 204, and the other end of the second reducer 205 is connected to the air inlet end of the second nozzle pipe 206. The other end of the second reducer 205 and the second nozzle pipe 206 are both located in the air inlet end of the outer pipe. The clean flue gas flows into the second reducer 205 along the elbow pipe 204, and its flow rate (and air pressure) increases as the cross-section of the second reducer 205 decreases, and a pressure difference is generated at both ends of the second reducer 205, which has a certain adsorption effect on the clean flue gas approaching, attracting more clean flue gas to gather, and then injected into the outer pipe (specifically the first reducer 201) through the second nozzle pipe 206. Preferably, the inner walls of the first reducer 201 and the first nozzle 202 are both provided with a wear-resistant layer 8. The outer wall of the windward side of the elbow pipe 204 is provided with a wear-resistant layer 8. The wear-resistant layer 8 is also made of wear-resistant ceramics to reduce the impact of smoke on the inner wall of the first reducer 201 and the first nozzle 202 and the outer wall of the windward surface of the elbow 204, thereby increasing their service life. Figure 3 The arrows in the figure represent the direction of smoke flow.

[0045] In order to monitor the actual operation effect of the venturi ejector 2, the desulfurization wastewater zero discharge drying system also includes: a pressure transmitter. Specifically, a pressure transmitter (not shown in the figure) is installed on the bypass flue 12 on both sides of the venturi ejector 2, so that the pressure at both ends of the venturi ejector 2 can be measured.

[0046] As a backup device for the first booster fan 3, the desulfurization wastewater zero-emission drying system also includes: a second booster fan 13 arranged in parallel with the first booster fan 3. The two booster fans have the same function and will not be described in detail in this embodiment. Preferably, the first booster fan 3 and the second booster fan 13 are switched by a valve on the flue (not shown in the figure).

[0047] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi, characterized in that: include: A bypass flue connected in parallel with the main flue of the boiler, wherein the inlet of the bypass flue is located between the boiler and the air preheater, and the outlet of the bypass flue is located between the air preheater and the dust collector, and further comprising: a first booster fan and a drying tower, a venturi ejector, and a rotary atomizer located on the bypass flue; The drying tower is connected to the desulfurization tower located on the main flue; The venturi ejector has an air inlet end, an air outlet end and an ejection end, the air inlet end is connected to the outlet flue of the drying tower, the air outlet end is connected to the inlet flue of the dust collector, and the venturi ejector is used to inject the flue gas passing through the drying tower into the dust collector; One end of the first booster fan is connected to the outlet flue of the dust collector, and the other end of the first booster fan is connected to the ejection end; The rotary atomizer is located at the top of the drying tower and is used to mix the flue gas from the bypass flue with the desulfurization wastewater from the desulfurization tower. The flue gas and wastewater droplets have the same flow direction in the rotary atomizer.

2. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 1 is characterized in that: The rotary atomizer is in a conical column shape and comprises: an inner ring, an outer ring, a main shaft, an atomizing nozzle and a motor; One end of the main shaft is connected to the output shaft of the motor; The inner ring is sleeved on the main shaft, the inner ring is connected to the main shaft, and one end of the inner ring is provided with the atomizing nozzle; The outer ring is sleeved on the inner ring, and the outer ring is connected via a plurality of guide plates arranged along the circumferential outer wall of the inner ring. The guide plates are arranged at an angle with the horizontal plane to change the flow direction of the smoke.

3. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 1 is characterized in that: The waste water discharged from the desulfurization tower is transported to the drying tower through a drainage pipe after desulfurization treatment.

4. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 1 is characterized in that: The Venturi ejector is a sleeve, comprising: an inner tube and an outer tube; The air inlet end of the outer tube is connected to the outlet flue of the drying tower, and the air outlet end of the outer tube is connected to the inlet flue of the dust collector; The ejection end of the inner tube is connected to the outlet flue of the first booster fan, and the air outlet end of the inner tube extends into the outer tube.

5. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 4 is characterized in that: The outer tube comprises: a first reducer tube, a first nozzle tube and a first expansion tube; The diameter of the first reducer gradually decreases along the direction of smoke flow; One end of the first nozzle tube is connected to the air outlet end of the first reducer tube, and the other end of the first nozzle tube is connected to the air inlet end of the first expander tube; The diameter of the first expansion tube gradually increases along the direction of smoke flow.

6. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 4 is characterized in that: The inner tube comprises: an elbow tube, a second reducer tube and a second nozzle tube; The elbow pipe is fixed in the outlet flue of the drying tower, and one end of the elbow pipe is connected to the outlet flue of the first booster fan; The diameter of the second reducer gradually decreases along the direction of smoke flow, one end of the second reducer is connected to the elbow pipe, the other end of the second reducer is connected to the air inlet end of the second nozzle pipe, and the other end of the second reducer and the second nozzle pipe are both located inside the air inlet end of the outer pipe.

7. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 5 is characterized in that: The inner walls of the first reducer and the first nozzle tube are both provided with a wear-resistant layer.

8. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 6 is characterized in that: A wear-resistant layer is arranged on the outer wall of the windward surface of the elbow pipe.

9. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 1 is characterized in that: The desulfurization wastewater zero-discharge drying system further includes: a pressure transmitter; The pressure transmitter is located on the bypass flue at both sides of the Venturi ejector and is used to measure the pressure at both ends of the Venturi ejector.

10. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 1 is characterized in that: The desulfurization wastewater zero-emission drying system also includes: a second booster fan arranged in parallel with the first booster fan, and the first booster fan and the second booster fan are switched by a valve on the flue.

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