A zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi

Abstract

The present invention discloses a zero-emission desulfurization wastewater drying system based on rotary atomization and Venturi, belonging to the field of wastewater desulfurization technology. The system comprises: a first booster fan, a bypass flue connected in parallel with the boiler main flue, a drying tower located on the bypass flue, a Venturi ejector, and a rotary atomizer. 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. 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 ejector end. The air inlet end is connected to the outlet flue of the drying tower, and the air outlet end is connected to the inlet flue of 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 ejector 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 flow in the same direction. This achieves zero wastewater discharge.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater desulfurization, and relates to a zero-discharge drying system for desulfurization wastewater 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] During the implementation of the existing desulfurization waste liquid drying technology, when the boiler is started and running at full load, the resistance of the air preheater 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 treated by the desulfurization tower (desulfurization waste liquid) 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 above 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 leading to serious dust accumulation at the bottom of the tower and the system cannot operate.

[0004] When the boiler is started and running 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 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 clogging of the drying tower.

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

[0006] In order to at least solve the problem in the prior art described above that when the boiler is operating at low load, insufficient air flow into the drying tower causes wastewater to flow directly into the tower bottom, resulting in a wet bottom phenomenon, the present invention provides the following technical solution: a zero-emission drying system for desulfurization 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 being located between the boiler and the air preheater, and the outlet of the bypass flue being 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;

[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 ejector 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 flow in the same direction in the rotary atomizer.

[0011] Optionally, in the above-mentioned zero-discharge drying system for desulfurization 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 to the horizontal plane to change the flow direction of the flue gas.

[0015] Optionally, in the above-mentioned zero-discharge 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 tube, 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 communicated with 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 includes: 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 includes: 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, and 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-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi, a wear-resistant layer is provided on the inner walls of the first convergent pipe and the first nozzle pipe.

[0027] Optionally, in the above-mentioned zero-discharge 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 on 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 technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0032] The present application installs a rotary atomizer on the top of the 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 injection end of the venturi ejector and the outlet flue of the dust collector to extract an appropriate amount of clean flue gas as the driving source of the venturi ejector, thereby increasing the outlet negative pressure of the drying tower and thus 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 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 diagram of a desulfurization waste liquid drying system in the prior art;

[0034] Figure 2 A schematic structural diagram of a zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to an embodiment of the present invention;

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

[0036] Figure 4 for Figure 2 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. Drying tower outlet flue; 10. Booster fan outlet flue; 11. Main flue; 12. Bypass flue; 13. Second booster fan. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0039] In the description of the present invention, the terms "longitudinal", "transverse", "up", "down", "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 should not 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 present invention 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 desulfurization 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 ejection 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 portion of the clean flue gas purified by the dust collector 6 into the venturi ejector 2 as a driving force, 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 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 and mixes with the desulfurization wastewater. 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 due to insufficient air intake of the drying tower 1 directly flows into the bottom of the tower, resulting in a wet bottom phenomenon. The rotary atomizer 4 can be the 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 column shape and includes: 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 is provided at one end of the inner ring 401 (i.e., the nozzle has a built-in atomizer). Since the atomizer is a commonly used device in this field of technology, it can achieve the atomization function, and this embodiment does not limit its specific structure. The outer ring 402 is sleeved onto the inner ring 401 and connected via multiple guide plates 405 arranged along the circumferential outer wall of the inner ring 401. This allows the outer ring 402 to rotate in the same direction as the inner ring 401. These guide plates 405 are arranged at an angle (inclined) to the horizontal plane to change the direction of the flue gas flow. The guide plates 405 are spaced apart to form multiple flue gas 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 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, creating a flue gas negative pressure zone between the inner and outer rings, attracting more flue gas into the rotary atomizer 4, increasing the flue gas flow rate. The flue gas in the inner ring presses down on 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 mix with the high-temperature flue gas and evaporate. 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 decreases, thereby preventing dust from settling in the drying tower 1 and the flue.

[0043] As an example of the specific structure of the aforementioned Venturi ejector 2, in this embodiment, the Venturi ejector 2 is a sleeve tube comprising an inner tube and an outer tube. The air inlet end of the outer tube communicates with the outlet flue 9 of the drying tower 1, while the air outlet end of the outer tube communicates with the inlet flue of the dust collector 6. The ejector end of the inner tube communicates with the outlet flue 10 of the first booster fan 3, and the air outlet end of the inner tube extends into the outer tube, thereby increasing 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 pipe through the outlet flue 9 of the drying tower 1. The negative pressure area in the outer pipe produces an adsorption effect on the exhaust gas, thereby attracting more flue gas into the drying tower 1 to form exhaust gas. After passing through the outer pipe, the exhaust gas 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 along the flue and is ejected into the outer pipe by the inner pipe as a driving source, and then is ejected into the inlet flue of the dust collector 6 by the outer pipe. It should be noted that both the inner pipe and the outer pipe are designed according to the Venturi principle, and each has a negative pressure area inside. This embodiment does not limit its specific structure.

[0044] Reference Figure 3As shown, the outer tube comprises a first reducer 201, a first nozzle 202, and a first expander 203. The diameter of the first reducer 201 gradually decreases along the flue gas flow direction. This increases the flue gas flow rate (and pressure) as the cross-section of the first reducer 201 decreases. This creates a pressure difference between the two ends of the first reducer 201, which attracts the incoming flue gas and attracts more flue gas, thereby increasing the air intake of the drying tower 1. One end of the first nozzle 202 is connected to the outlet of the first reducer 201, while the other end is connected to the inlet of the first expander 203. This allows the high-pressure flue gas flowing out of the first reducer 201 to flow rapidly into the first expander 203 through the first nozzle 202. The diameter of the first expander 203 gradually increases along the flue gas flow direction. This reduces the flow rate (and pressure) of the high-pressure flue gas as the cross-section increases, thereby preventing the high-pressure flue gas from impacting 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 reinforcement plates 7 are arranged around the circumference of the elbow tube 204, connecting the elbow tube 204 to the inner wall of the flue through the reinforcement 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 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 inside the air inlet end of the outer pipe. Clean flue gas flows into the second reducer 205 along the elbow pipe 204. 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, a wear-resistant layer 8 is provided on the inner wall of the first reducer 201 and the first nozzle 202. A wear-resistant layer 8 is provided on the outer wall of the windward side of the elbow pipe 204. 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 windward outer wall of the elbow 204, thereby increasing their service life. Figure 3 The arrows in the figure represent the direction of flue gas flow.

[0045] To monitor the actual operating performance of the Venturi ejector 2, the desulfurization wastewater zero-discharge drying system also includes a pressure transmitter. Specifically, pressure transmitters (not shown) are installed on the bypass flues 12 on both sides of the Venturi ejector 2 to measure the pressure at both ends of the Venturi ejector 2.

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

[0047] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by 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 boiler main flue, the inlet of the bypass flue being located between the boiler and the air preheater, and the outlet of the bypass flue being located between the air preheater and the dust collector, 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 ejector 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 flow in the same direction in the rotary atomizer. 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 to the inner ring via a plurality of guide plates arranged along the circumferential outer wall of the inner ring, wherein the guide plates are arranged at an angle to the horizontal plane to change the flow direction of the flue gas; 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 gas outlet end of the inner tube extends into the outer tube; The outer tube includes: 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; The inner tube includes: 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; The desulfurization wastewater zero-emission drying system further 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.

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

3. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 1 is characterized in that: The inner walls of the first reducer and the first nozzle tube are both provided with a wear-resistant layer.

4. The zero-discharge drying system for desulfurization wastewater based on rotary atomization and Venturi according to claim 1 is characterized in that: A wear-resistant layer is provided on the outer wall of the windward side of the elbow pipe.

5. 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 on both sides of the Venturi ejector and is used to measure the pressure at both ends of the Venturi ejector.

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