A boiler wet desulfurization system

Abstract

This invention provides a wet desulfurization system for boilers, relating to the field of boiler tail gas treatment technology. It includes a reaction tower with a flue gas inlet on one side and a flue gas outlet at the top. It also includes a spray plate and spray components. The spray plate is positioned between the flue gas inlet and the flue gas outlet. Multiple spray components are evenly distributed and fixedly installed in the middle of the spray plate. The spray components spray liquid into the inside of the reaction tower, causing it to react with the gas entering the tower. The spray components include nozzles, a mounting frame, and an adjusting rod. A liquid inlet pipe is connected to one side of the nozzle; the liquid inlet pipe passes through the mounting frame and is fixedly connected to it; the adjusting rod passes through the nozzle at both ends; a thermal expansion element is provided between the top of the adjusting rod and the mounting frame, which can push the adjusting rod to slide relative to the nozzle, adjusting the spraying efficiency of the nozzle. By setting up the above components, this invention effectively achieves the purpose of dynamically adjusting the spraying efficiency according to temperature, improving the gas-liquid mixing efficiency, and thus improving the tail gas treatment effect.

Description

Technical Field

[0001] This invention relates to the field of boiler exhaust gas treatment technology, and in particular to a boiler wet desulfurization system. Background Technology

[0002] Wet desulfurization is a widely used technology in the treatment of flue gas from coal-fired boilers. It removes sulfur dioxide from the flue gas by allowing it to fully contact and chemically react with an alkaline absorbent liquid within a reaction vessel. A typical wet desulfurization system usually includes a reaction vessel with an inlet and an outlet, and a spray system for spraying the absorbent liquid into the reaction vessel. These spray systems generally use fixed nozzles to spray liquid into the flue gas stream to achieve gas-liquid contact.

[0003] However, in actual industrial operation scenarios, coal-fired boilers are affected by multiple factors such as load scheduling, coal quality, and combustion conditions, resulting in a non-constant operating state. This leads to significant fluctuations in the flue gas parameters entering the reaction vessel. On the one hand, changes in boiler load directly alter the flue gas flow rate and velocity. Under high load conditions, the flue gas volume is large and the velocity is fast, resulting in a shorter residence time within the tower. Under low load conditions, the flue gas volume is small and the velocity is slow, making it prone to flow deviation and dead zones within the tower. On the other hand, differences in coal sulfur content and fluctuations in combustion temperature cause significant changes in the inlet flue gas sulfur dioxide concentration and temperature. Simultaneously, the dust content in the flue gas also fluctuates synchronously with the combustion conditions, further interfering with the gas-liquid contact reaction effect.

[0004] Spraying devices with fixed spraying efficiency cannot match the changing state of flue gas in real time. When the flue gas temperature is high or the pollutant concentration is high, it may lead to insufficient gas-liquid reaction and reduced desulfurization efficiency. When the flue gas temperature is low or the pollutant concentration is low, it may cause excessive consumption of absorbent liquid and energy waste.

[0005] Therefore, there is an urgent need for a boiler wet desulfurization system that can dynamically adjust the slurry output flow according to temperature and improve the gas-liquid reaction efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a wet desulfurization system for boilers to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a boiler wet desulfurization system, comprising a reaction tower with a flue gas inlet on one side and a flue gas outlet on the top, and further comprising: a spray plate fixedly installed in the middle of the reaction tower and positioned between the flue gas inlet and the flue gas outlet; a spray assembly fixedly installed in the middle of the spray plate and evenly distributed in multiple forms, the spray assembly spraying liquid into the inside of the reaction tower to react with the gas entering the reaction tower, the spray assembly comprising: a nozzle with a liquid inlet pipe connected to one side; a mounting frame fixedly installed at the bottom of the spray plate, the liquid inlet pipe passing through the mounting frame and fixedly connected to the mounting frame; an adjusting rod slidably installed in the middle of the nozzle, with its upper and lower ends passing through the nozzle; a thermal expansion member provided between the top of the adjusting rod and the mounting frame, the thermal expansion member being able to push the adjusting rod to slide relative to the nozzle, thereby adjusting the spray flow rate of the nozzle.

[0008] Preferably, the spray assembly further includes: an arc-shaped ring, which is slidably sleeved on the outside of the nozzle; a plurality of guide grooves are provided in the middle of the nozzle, and the adjusting rod can slide up and down along the guide grooves; a liquid outlet chamber is provided in the middle of the nozzle, with one end connected to the guide groove and the other end passing through the nozzle and placed at the lower end of the arc-shaped ring; the adjusting rod can block the liquid outlet chamber and control the liquid to be discharged from the nozzle through the liquid outlet chamber; and an adjustment section is threadedly connected to the lower end of the nozzle and placed on the outside of the adjusting rod, with the middle of the adjustment section having a funnel-shaped opening.

[0009] Preferably, the adjusting rod includes: a guide sleeve rod, which is slidably disposed in the middle of the nozzle and has multiple baffles fixedly connected to its outer side, the baffles being able to block the liquid outlet chamber; a release rod, which is slidably disposed in the middle of the guide sleeve rod, and a flow regulating platform is fixedly connected to the lower end of the release rod; the flow regulating platform has a frustum-shaped structure and is placed in a funnel-shaped opening in the middle of the adjusting section; controlling the distance between the flow regulating platform and the adjusting section controls the liquid flow rate through the nozzle.

[0010] Preferably, the spray assembly further includes: a lower pressure plate, which is fixedly connected to the upper end of the guide sleeve rod and abuts against the bottom of the thermal expansion member; the upper end of the guide sleeve rod is provided with a guide notch; a reset plate, which is fixedly installed on the upper end of the release rod, with lower pressure rods fixedly connected to both ends of the reset plate, the other end of the lower pressure rod being fixedly connected to an arc-shaped ring, and the inner side of the reset plate passing through the guide notch and being able to slide up and down.

[0011] Preferably, the nozzle has an annular groove on its inner side, and an annular spring is provided in the annular groove; a closing ring is provided in the annular groove, which can slide up and down along the annular groove and seal relative to the annular groove; a constant pressure channel penetrating the nozzle is provided at the bottom of the annular groove; a pressure hole is provided, which penetrates the side wall of the nozzle and is evenly distributed in multiples, and the outlet of the pressure hole corresponds to the upper end of the arc-shaped ring; the liquid in the pressure hole can push the arc-shaped ring to slide downward.

[0012] Preferably, a vertical groove is provided in the middle of the arc-shaped ring, and a pin is detachably installed on the outer side of the nozzle; the pin passes through the vertical groove, so that the arc-shaped ring can only slide in the vertical direction.

[0013] Preferably, a sealing cap is fixedly connected to the upper end of the nozzle, and an elastic element is provided between the sealing cap and the reset plate; a quick-connect port is fixedly connected to the end of the liquid inlet pipe.

[0014] Preferably, it further includes: a liquid inlet pipe, which is placed at the upper end of the spray plate and penetrates the side wall of the reaction tower; the liquid inlet pipe is used to input liquid; each of the liquid inlet pipes is connected to the liquid inlet pipe; the lower end of the reaction tower is connected to a drain pipe for discharging residual liquid and products in the reaction tower.

[0015] Preferably, it also includes: a demister, which is fixedly installed inside the reaction tower and placed between the spray plate and the flue gas outlet, for filtering water droplets in the discharged flue gas.

[0016] Preferably, it also includes an air inlet, which is fixedly installed on one side of the reaction tower for introducing air into the reaction tower.

[0017] This invention provides a wet desulfurization system for boilers, which has the following beneficial effects: 1. This invention effectively achieves the goal of dynamically adjusting the spraying efficiency based on temperature by setting up a thermal expansion component and an adjusting rod. The thermal expansion component can automatically adjust the spraying efficiency of the nozzles according to the temperature changes of the flue gas flowing through the spray assembly area. When the temperature of the flue gas entering the reactor increases, this temperature change is transmitted to the thermal expansion component, causing it to expand thermally and push the adjusting rod downward. The sliding of the adjusting rod changes the degree of blockage of the liquid outlet chamber or changes the gap between the flow regulating platform and the funnel-shaped opening of the adjusting section, thereby increasing the channel area for liquid to flow out of the nozzle or reducing the flow resistance, ultimately improving the spraying efficiency. Conversely, when the flue gas temperature decreases, the thermal expansion component contracts, the adjusting rod moves upward, reducing the liquid outflow channel and thus reducing the spraying efficiency. This adaptive adjustment process allows the spraying efficiency to match the flue gas temperature in real time, ensuring sufficient liquid to participate in the reaction under high temperature and high concentration conditions to guarantee desulfurization efficiency, and reducing liquid consumption to save resources under low temperature and low concentration conditions.

[0018] 2. By setting an adjusting rod, a guide chute, a liquid outlet chamber, and an arc-shaped ring, this invention can effectively improve the gas-liquid mixing efficiency. During use, the slurry discharged through the liquid outlet chamber can impact the lower end of the arc-shaped ring. Due to the influence of the arc-shaped ring's shape, the slurry generates an inward vortex, prolonging the mixing time of flue gas and slurry, and further atomizing the slurry to improve the mixing effect.

[0019] 3. This invention effectively clears blockages by setting up a sealing ring, a pressure hole, an arc-shaped ring, and a reset plate. When a blockage occurs, the inlet pressure of the infusion tube is increased, the sealing ring opens the pressure hole, and the slurry impacts the upper end of the arc-shaped ring, causing it to slide downwards. At the same time, the release rod pushes the flow regulating platform downwards, increasing the gap between the flow regulating platform and the adjustment section, allowing the slurry to flush out the blockage. Furthermore, the gap between the flow regulating platform and the adjustment section also increases when the temperature rises, which also helps to clear blockages. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall invention.

[0021] Figure 2 This is a schematic diagram of the internal gas-liquid flow direction of the reaction tower in this invention.

[0022] Figure 3 This is a schematic diagram showing the positional relationship between the spray plate and the spray assembly in this invention.

[0023] Figure 4 This is a schematic diagram of the internal structure of the spray assembly in this invention.

[0024] Figure 5 This is a schematic diagram of the structure after the adjusting rod slides down in this invention.

[0025] Figure 6 This is a schematic diagram showing the liquid flow direction inside the spray assembly after the pressure in the inlet pipe increases in this invention.

[0026] Figure 7 This is a schematic diagram of the liquid flow direction inside the spray assembly after the liquid outlet chamber is opened in this invention.

[0027] Figure 8 This is a cross-sectional view of the spray assembly in this invention.

[0028] Figure 9 This is a disassembly diagram of the spray assembly in this invention.

[0029] In the picture: 1. Reaction tower; 2. Flue gas inlet; 3. Flue gas outlet; 4. Spray plate; 5. Spray assembly; 501. Spray head; 502. Liquid inlet pipe; 503. Mounting bracket; 504. Adjusting rod; 5041. Guide sleeve rod; 5042. Baffle plate; 5043. Release rod; 5044. Flow regulating platform; 505. Thermal expansion component; 506. Arc ring; 5061. Vertical groove; 507. Guide chute; 508. Liquid outlet chamber 509. Adjustment section; 510. Lower pressure plate; 511. Guide notch; 512. Reset plate; 513. Lower pressure rod; 514. Annular groove; 515. Annular spring; 516. Sealing ring; 517. Constant pressure channel; 518. Lower pressure hole; 519. Pin; 520. Sealing cover; 521. Elastic element; 522. Quick-connect port; 6. Infusion tube; 7. Drain tube; 8. Demister; 9. Air inlet. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides, for example Figures 1 to 9 The boiler wet desulfurization system shown includes a reaction tower 1 with a flue gas inlet 2 on one side and a flue gas outlet 3 at the top. The reaction tower 1 is vertically oriented, and the flue gas inlet 2 is located in the lower middle part of the reaction tower 1. The flue gas inlet 2 is connected to the flue gas to be desulfurized through a pipe, allowing the flue gas to enter the reaction tower 1 and then be discharged from the flue gas outlet 3 after desulfurization. The system also includes a spray plate 4, which is fixedly installed in the middle of the reaction tower 1 and placed between the flue gas inlet 2 and the flue gas outlet 3. The spray plate 4 is fixedly and horizontally installed in the middle of the reaction tower. A spray assembly 5 is fixedly installed in the middle of the spray plate 4, and multiple spray assemblies are evenly distributed. The spray assembly 5 sprays liquid into the inside of the reaction tower 1, causing it to react with the gas entering the reaction tower 1.

[0032] The spray plate 4 is used to support and install the spray assembly 5. Multiple spray assemblies 5 are evenly distributed in an array to spray alkaline absorbent liquid (such as limestone slurry) into the inside of the reactor, causing it to come into countercurrent contact with the rising flue gas and undergo a chemical reaction to remove sulfur dioxide. The spray assembly 5 achieves adaptive adjustment of spraying efficiency through its internally integrated temperature response mechanism. When the temperature of the flue gas flowing through the area of ​​the spray assembly 5 increases, the mechanism activates to enlarge the liquid spraying channel of the nozzle 501 or reduce the resistance, thereby increasing the spray volume to match higher loads or higher pollutant concentrations; conversely, when the flue gas temperature decreases, the mechanism resets to reduce the spray volume and avoid liquid waste.

[0033] Specifically, the spray assembly 5 includes: a nozzle 501, one side of which is connected to a liquid inlet pipe 502 for inputting absorbent liquid; a mounting bracket 503, which is fixedly installed at the bottom of the spray plate 4, the liquid inlet pipe 502 passing through the mounting bracket 503 and fixedly connected to the mounting bracket 503, and the liquid inlet pipe 502 passing through the mounting bracket 503 and fixedly connected to the mounting bracket 503 by welding or bolts, thereby stably suspending the entire spray assembly 5 below the spray plate 4; an adjusting rod 504, which is slidably installed in the middle of the nozzle 501, and its upper and lower ends pass through the nozzle 501; a thermal expansion member 505 is provided between the top of the adjusting rod 504 and the mounting bracket 503, the thermal expansion member 505 can push the adjusting rod 504 to slide relative to the nozzle 501, adjust the spraying efficiency of the nozzle 501, and the thermal expansion member 505 can deform accordingly according to the change of the surrounding flue gas temperature. Specifically, the thermal expansion element 505 can be a bimetallic temperature-sensing element, composed of two metal sheets with different coefficients of thermal expansion bonded together, which bends and displaces downward when heated; alternatively, the thermal expansion element 505 can also be a temperature-sensing bag filled with thermally expanding materials such as paraffin wax, which expands when heated and pushes the internal piston rod downward. When the flue gas temperature rises, the thermal expansion element 505 expands due to heat, pushing the adjusting rod 504 downward; when the flue gas temperature decreases, the thermal expansion element 505 contracts, reducing or eliminating the downward pressure on the adjusting rod 504.

[0034] More specifically, the spray assembly 5 also includes: an arc-shaped ring 506, which is slidably sleeved on the outer cylindrical part of the nozzle 501; multiple guide grooves 507 are axially formed in the middle of the nozzle 501, and the adjusting rod 504 can slide up and down along the guide grooves 507, thus being restricted to linear movement only; a liquid outlet chamber 508, which is formed in the middle of the nozzle 501, with one end connected to the guide grooves 507 and the other end passing through the nozzle 501 and placed at the lower end of the arc-shaped ring 506, and the liquid outlet chamber 508 is generally inclined upwards; the adjusting rod 504 The adjusting rod 504 can block the outlet chamber 508, controlling the liquid flow through it to the nozzle 501. A specific part of the adjusting rod 504 can partially or completely block the inlet of the outlet chamber 508, thus controlling whether liquid can flow through the outlet chamber 508 to the nozzle 501. The adjusting section 509 is threaded to the lower end of the nozzle 501 and positioned outside the adjusting rod 504. The adjusting section 509 has a funnel-shaped opening in the middle and is threaded to the lower end of the nozzle 501, enclosing the lower part of the adjusting rod 504. The adjusting section 509 has an inwardly contracting funnel-shaped opening in the middle, which matches the shape of the lower part of the adjusting rod 504, together forming a variable throttling channel.

[0035] Specifically, the adjusting rod 504 includes: a guide sleeve rod 5041, which is slidably disposed in the middle of the nozzle 501, and has multiple baffle plates 5042 fixedly connected to its outer side. The baffle plates 5042 can block the liquid outlet chamber 508. When the guide sleeve rod 5041 is in a higher position, these baffle plates 5042 can tightly block the inlet of the liquid outlet chamber 508 inside the nozzle 501, preventing liquid from flowing out; a release rod 5043, which is slidably disposed in the middle of the guide sleeve rod 5041, and has a flow regulating platform 5044 fixedly connected to its lower end; the flow regulating platform 5044 has a frustum-shaped structure and is placed in the funnel-shaped opening in the middle of the adjusting section 509; the distance between the flow regulating platform 5044 and the adjusting section 509 is controlled to control the liquid flow rate through the nozzle 501.

[0036] The flow control platform 5044 is designed as a frustum-shaped structure, positioned precisely within the funnel-shaped opening in the center of the adjustment section 509. By controlling the distance between the side of the frustum-shaped platform 5044 and the inner wall of the funnel-shaped opening in the adjustment section 509, the size of the annular gap through which the liquid flows can be altered, thereby precisely controlling the liquid flow rate through the nozzle 501. When the liquid pressure within the nozzle 501 is constant, a greater distance between the flow control platform 5044 and the adjustment section 509 results in a larger channel for liquid outflow and a higher flow rate; conversely, a smaller distance results in a smaller channel for liquid outflow and a lower flow rate.

[0037] More specifically, the spray assembly 5 also includes: a lower pressure plate 510, which is fixedly connected to the upper end of the guide sleeve rod 5041 and abuts against the bottom of the thermal expansion member 505, for receiving the downward pressure transmitted by the thermal expansion member 505; a guide notch 511 is provided at the upper end of the guide sleeve rod 5041; a reset plate 512, which is fixedly installed at the upper end of the release rod 5043, with a lower pressure rod 513 fixedly connected to both ends of the reset plate 512, the other end of the lower pressure rod 513 being bent downward and fixedly connected to the arc ring 506, the inner side of the reset plate 512 passing through the guide notch 511 and being able to slide up and down, this connection relationship allows the reset plate 512 to push the arc ring 506 downward simultaneously when it moves downward under the pressure of the lower pressure plate 510.

[0038] Specifically, the nozzle 501 has an annular groove 514 on its inner side, and an annular spring 515 is provided inside the annular groove 514; a sealing ring 516 is provided inside the annular groove 514, which can slide up and down along the annular groove 514 and seals relative to the annular groove 514; a sealing ring is provided on the outer side of the sealing ring 516 to maintain a seal with the inner wall of the annular groove 514; a constant pressure channel 517 is provided at the bottom of the annular groove 514, which connects the lower cavity of the annular groove 514 to the outside of the nozzle 501, ensuring that the sealing ring 516 can slide within the annular groove 514; a pressure hole 518 penetrates the side wall of the nozzle 501 and is evenly distributed in multiple locations, with the outlet of the pressure hole 518 corresponding to the upper end of the arc-shaped ring 506; the liquid in the pressure hole 518 can push the arc-shaped ring 506 to slide downwards, such as... Figure 6 As shown, when liquid is ejected from the pressure hole 518, the resulting jet pressure can act on the upper end face of the arc ring 506, thereby pushing the arc ring 506 to slide downward as a whole. The arc ring 506 drives the release rod 5043 downward, increasing the gap between the flow adjustment table 5044 and the funnel-shaped opening in the middle of the adjustment section 509, and increasing the output flow rate of the nozzle 501.

[0039] More specifically, a vertical groove 5061 is provided in the middle of the arc-shaped ring 506, and a pin 519 is detachably installed on the outside of the nozzle 501; the pin 519 passes through the vertical groove 5061, so that the arc-shaped ring 506 can only slide in the vertical direction, thus restricting the arc-shaped ring 506 to slide only in the direction of the vertical groove 5061 (i.e., the vertical direction) and preventing it from rotating, thereby ensuring the accuracy of its movement trajectory.

[0040] Specifically, a sealing cap 520 is fixedly connected to the upper end of the nozzle 501. An elastic element 521 is provided between the sealing cap 520 and the reset plate 512. The elastic element 521 is preferably a helical compression spring. The elastic element 521 always applies an upward elastic force to the reset plate 512, thereby causing the arc-shaped ring 506 to have an upward tendency through the downward pressure rod 513. A quick-connect port 522 is fixedly connected to the end of the liquid inlet pipe 502, which facilitates quick connection and disassembly with external pipelines and is convenient for maintenance.

[0041] More specifically, it also includes: a liquid delivery pipe 6, which is located above the spray plate 4 and penetrates the side wall of the reaction tower 1; a liquid inlet pipe 502 for inputting liquid; the liquid delivery pipe 6 is arranged above the spray plate 4 and horizontally penetrates the side wall of the reactor. The externally supplied absorbent is transported into the reactor through the liquid delivery pipe 6; each liquid inlet pipe 502 is connected to the liquid delivery pipe 6, and the liquid inlet pipe 502 of each spray assembly 5 is connected to this common liquid delivery pipe 6 through a tee or branch pipe to achieve centralized liquid supply; the lower end of the reaction tower 1 is connected to a drain pipe 7 for discharging residual liquid and products in the reaction tower 1; the bottom of the reactor is conical or inclined, and the drain pipe 7 is connected at the lowest point.

[0042] Specifically, it also includes: a demister 8, which is fixedly installed inside the reaction tower 1 and placed between the spray plate 4 and the flue gas outlet 3. It is used to filter water droplets in the discharged flue gas. The function of the demister 8 is to filter and capture the tiny droplets that rise with the flue gas, preventing the flue gas carrying moisture from being discharged directly, thereby reducing material loss and potential environmental impact.

[0043] More specifically, it also includes: an air inlet 9, which is fixedly installed on one side of the reaction tower 1, for introducing air into the reaction tower 1. The air blown in can provide the oxygen required for the desulfurization chemical reaction, promote the oxidation of sulfite to sulfate, thereby improving the desulfurization efficiency and facilitating the generation of by-products.

[0044] During the flue gas treatment process, high-temperature sulfur-containing flue gas enters the reactor through the inlet 2 and flows upward through the spray area. The absorbent sprayed by the spray assembly 5 comes into countercurrent contact with the flue gas, resulting in a desulfurization reaction. The desulfurized flue gas is discharged from the reaction tower 1 after passing through the demister 8, and the particulate matter generated by the reaction between the absorbent and the flue gas falls into the bottom of the reaction tower 1.

[0045] When the flue gas temperature rises, the efficiency of the desulfurization reaction changes due to temperature variations, necessitating an increase in the input of the absorbent liquid. The thermal expansion component 505 expands due to the flue gas temperature, pushing the lower pressure plate 510 and the guide sleeve 5041 downwards. On one hand, the downward movement of the guide sleeve 5041 causes the baffle plate 5042 on it to gradually disengage from the blockage at the inlet of the liquid outlet chamber 508, opening the liquid outflow channel and allowing some slurry to be discharged through the liquid outlet chamber 508. This impacts the lower end of the arc-shaped ring 506, causing the slurry to flow out and generate a downward vortex due to the influence of the arc-shaped ring 506, slowing the upward velocity of the flue gas and increasing the desulfurization reaction time. On the other hand, the downward movement of the guide sleeve 5041 causes the release rod 5043 to move downwards as well, increasing the throttling gap between the flow regulating platform 5044 and the adjusting section 509, thus increasing the slurry flow rate through this gap. Both effects significantly improve the spraying efficiency and liquid flow rate of the nozzle 501.

[0046] When the temperature recovers, the thermal expansion component 505 contracts, reducing the downward pressure on the guide sleeve 5041. At this time, under the restoring force of the elastic component 521, the guide sleeve 5041 moves upward, closing the liquid outlet chamber 508 again. Simultaneously, the flow regulating platform 5044 moves upward, reducing the throttling gap, thereby reducing spraying efficiency and achieving energy saving.

[0047] When prolonged operation causes blockage in nozzle 501, the inlet pressure of the infusion pipe 6 is increased. The sealing ring 516 slides downward under the influence of the internal pressure of nozzle 501 and squeezes the annular spring 515, making the pressure hole 518 open. The slurry in nozzle 501 is discharged through the pressure hole 518. The slurry impacts the upper end of the arc-shaped ring 506, causing the arc-shaped ring 506 to slide downward. At the same time, the release rod 5043 pushes the flow adjustment table 5044 downward, increasing the gap between the flow adjustment table 5044 and the adjustment section 509, and the blockage is flushed out by the slurry.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A boiler wet desulfurization system, comprising a reaction tower (1), having a flue gas inlet (2) on one side and a flue gas outlet (3) at the top, characterized in that, Also includes: The spray plate (4) is fixedly installed in the middle of the reaction tower (1) and placed between the smoke inlet (2) and the smoke outlet (3); The spray assembly (5) is fixedly installed in the middle of the spray plate (4) and there are multiple spray assemblies evenly distributed. The spray assembly (5) sprays liquid into the inside of the reaction tower (1) so that it reacts with the gas entering the reaction tower (1). The spray assembly (5) includes: a nozzle (501) with a liquid inlet pipe (502) connected to one side. Mounting bracket (503) is fixedly installed at the bottom of spray plate (4), and liquid inlet pipe (502) passes through mounting bracket (503) and is fixedly connected to mounting bracket (503); The adjusting rod (504) is slidably installed in the middle of the nozzle (501), and its upper and lower ends pass through the nozzle (501). A thermal expansion member (505) is provided between the top of the adjusting rod (504) and the mounting bracket (503). The thermal expansion member (505) can push the adjusting rod (504) to slide relative to the nozzle (501) to adjust the spray flow rate of the nozzle (501).

2. The boiler wet desulfurization system according to claim 1, characterized in that, The spray assembly (5) also includes: An arc-shaped ring (506) is slidably sleeved on the outside of the nozzle (501); The nozzle (501) has multiple guide grooves (507) in the middle, and the adjusting rod (504) can slide up and down along the guide grooves (507); The liquid outlet chamber (508) is located in the middle of the nozzle (501), with one end connected to the guide groove (507) and the other end passing through the nozzle (501) and placed at the lower end of the arc ring (506). The adjusting rod (504) can block the liquid outlet chamber (508) and control the liquid to be discharged from the nozzle (501) through the liquid outlet chamber (508); The adjusting section (509) is threaded to the lower end of the nozzle (501) and is located outside the adjusting rod (504). The middle part of the adjusting section (509) has a funnel-shaped opening.

3. The boiler wet desulfurization system according to claim 2, characterized in that, The adjusting rod (504) includes: The guide sleeve (5041) is slidably disposed in the middle of the nozzle (501), and multiple baffles (5042) are fixedly connected to its outer side. The baffles (5042) can block the liquid outlet chamber (508). Release rod (5043) is slidably disposed in the middle of guide sleeve rod (5041), and the lower end of release rod (5043) is fixedly connected to flow regulating table (5044). The regulating table (5044) has a frustum-shaped structure and is placed in the funnel-shaped opening in the middle of the regulating section (509); The distance between the control flow table (5044) and the adjustment section (509) controls the liquid flow rate through the nozzle (501).

4. A boiler wet desulfurization system according to claim 3, characterized in that, The spray assembly (5) also includes: The lower pressure plate (510) is fixedly connected to the upper end of the guide sleeve (5041) and abuts against the bottom of the thermal expansion member (505); The upper end of the guide sleeve (5041) is provided with a guide notch (511). The reset plate (512) is fixedly installed on the upper end of the release rod (5043). The two ends of the reset plate (512) are fixedly connected to the pressure rod (513). The other end of the pressure rod (513) is fixedly connected to the arc ring (506). The inner side of the reset plate (512) passes through the guide notch (511) and can slide up and down.

5. A boiler wet desulfurization system according to claim 4, characterized in that, The nozzle (501) has an annular groove (514) on its inner side, and an annular spring (515) is provided in the annular groove (514). The annular groove (514) is provided with a closing ring (516), which can slide up and down along the annular groove (514) and seal relative to the annular groove (514); The bottom of the annular chute (514) is provided with a constant pressure channel (517) that penetrates the nozzle (501). The pressure hole (518) penetrates the side wall of the nozzle (501) and is evenly distributed in multiples. The outlet of the pressure hole (518) corresponds to the upper end of the arc-shaped ring (506). The liquid inside the pressure hole (518) can push the arc ring (506) to slide downward.

6. A boiler wet desulfurization system according to claim 2, characterized in that, A vertical groove (5061) is provided in the middle of the arc ring (506), and a pin (519) is detachably installed on the outside of the nozzle (501). The pin (519) passes through the vertical groove (5061), so that the arc ring (506) can only slide in the vertical direction.

7. A boiler wet desulfurization system according to claim 4, characterized in that, The upper end of the nozzle (501) is fixedly connected to a sealing cover (520), and an elastic element (521) is provided between the sealing cover (520) and the reset plate (512). The end of the liquid inlet pipe (502) is fixedly connected to a quick-connect port (522).

8. A boiler wet desulfurization system according to claim 1, characterized in that, Also includes: The infusion pipe (6) is placed at the upper end of the spray plate (4) and penetrates the side wall of the reaction tower (1). The inlet pipe (502) is used to input liquid. Each of the aforementioned inlet tubes (502) is connected to the infusion tube (6); The lower end of the reaction tower (1) is connected to a drain pipe (7) for discharging residual liquid and products inside the reaction tower (1).

9. A boiler wet desulfurization system according to claim 1, characterized in that, Also includes: The demister (8) is fixedly installed inside the reaction tower (1) and placed between the spray plate (4) and the exhaust port (3) to filter water droplets in the exhaust gas.

10. A boiler wet desulfurization system according to claim 1, characterized in that, Also includes: An air inlet (9) is fixedly installed on one side of the reaction tower (1) and is used to input air into the reaction tower (1).

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