Method for desulfurization and denitrification of industrial exhaust gas

Abstract

The application discloses a desulfurization and denitrification method for industrial waste gas. In the desulfurization and denitrification method for industrial waste gas, a desulfurization and denitrification device is used to perform desulfurization and denitrification treatment on the industrial waste gas, lime water and waste gas are respectively output by lime water nozzles and waste gas nozzles arranged in rotation, the lime water is arranged above the waste gas, so that the lime water and the waste gas are in mutual contact during the falling of the lime water and the rising of the waste gas, the lime water and the waste gas are fully mixed and contacted, the lime water and the waste gas are fully reacted, meanwhile, the upward thrust generated when the waste gas is sprayed is used to support the small droplets of the lime water output by the lime water nozzles, the falling time of the lime water in the air is prolonged, the contact reaction time of the lime water and the waste gas is further prolonged, the utilization rate of the lime water is improved, and the desulfurization and denitrification effect on the industrial waste gas is improved.

Description

Technical Field

[0001] This invention belongs to the field of waste gas treatment technology, and particularly relates to a method for desulfurization and denitrification of industrial waste gas. Background Technology

[0002] When toxic and harmful substances in industrial waste gas enter the human body through the respiratory tract and skin, long-term exposure to low concentrations or short-term exposure to high concentrations can cause harm to the human body and damage people's health. In particular, chemical plants, steel plants, pharmaceutical plants, coking plants and oil refineries produce more waste gas, which has a strong odor and very complex physical and chemical properties, and its toxicity varies.

[0003] To protect the environment and reduce the harm of waste gas to the natural environment, waste gas emitted by steel plants generally requires desulfurization and denitrification treatment. However, the following problems generally exist when using existing technologies for desulfurization and denitrification treatment of waste gas:

[0004] 1. In the existing technology, lime water is generally used to desulfurize and denitrify waste gas. By spraying lime water into the reaction tank, the lime water reacts with the waste gas in the reaction tank to produce precipitate, thereby completing the desulfurization and denitrification treatment. However, since the sprayed lime water falls off quickly, the reaction between the lime water and the waste gas is not complete, resulting in a low utilization rate of lime water.

[0005] 2. In the existing technology, when spraying lime water, the lime water reacts with the exhaust gas to form a precipitate, and the diameter of the small hole on the nozzle is small, which often causes the small hole on the nozzle to be blocked, resulting in poor lime water spraying.

[0006] 3. In the existing technology, solid precipitates are produced by the reaction of waste gas and lime water spray. These precipitates will stick to the inner wall of the reaction tank when they fall, which will affect the reaction over time. Manual cleaning is required regularly, but manual cleaning is dangerous and easy to inhale waste gas, which will affect the health of workers. Summary of the Invention

[0007] To address the aforementioned problems, this invention discloses a method for desulfurization and denitrification of industrial waste gas, in order to overcome or at least partially solve the aforementioned problems.

[0008] The desulfurization and denitrification method for industrial waste gas employs desulfurization and denitrification equipment. This equipment includes a reaction tank, a lime water nozzle, and an exhaust gas nozzle. The reaction tank has an inlet, an outlet, an air inlet, and an outlet. The inlet is connected to the inlet of the lime water nozzle, the outlet is located at the bottom of the reaction tank, the inlet is connected to the inlet of the exhaust gas nozzle, and the outlet is located at the top of the reaction tank. The lime water nozzle is located inside the reaction tank, with its outlet facing upwards and capable of reciprocating rotation within the tank. The exhaust gas nozzle is also located inside the reaction tank, with its outlet facing upwards, positioned below the lime water nozzle, and capable of reciprocating rotation within the tank.

[0009] The desulfurization and denitrification method for this industrial waste gas specifically includes the following steps:

[0010] Step S1, Start-up: Drive the lime water nozzle and the exhaust gas nozzle to rotate inside the reaction tank respectively;

[0011] Step S2, desulfurization and denitrification of waste gas: Lime water is guided to the lime water nozzle through the liquid inlet and sprayed into the reaction tank to form small lime water droplets; waste gas is guided to the waste gas nozzle through the air inlet and sprayed upward into the reaction tank below the lime water nozzle, so that the falling lime water droplets and the upward flowing waste gas form a contact reaction to desulfurize and denitrify the waste gas. The waste gas that has completed the desulfurization and denitrification treatment is discharged through the air outlet.

[0012] Preferably, the desulfurization and denitrification equipment includes a nozzle support and a drive motor; the nozzle support is fixed inside the reaction tank, and has a liquid inlet channel communicating with the liquid inlet and an air inlet channel communicating with the air inlet; the lime water nozzle is sleeved on the nozzle support, can reciprocate relative to the nozzle support, and remains in communication with the liquid inlet channel; the exhaust gas nozzle is sleeved on the nozzle support, can reciprocate relative to the nozzle support, and remains in communication with the air inlet channel; the drive motor is connected to the lime water nozzle and the exhaust gas nozzle to drive the lime water nozzle and the exhaust gas nozzle to rotate.

[0013] Preferably, the desulfurization and denitrification equipment includes a second bevel gear, a third bevel gear, and a fourth bevel gear; the second bevel gear is sleeved on the outside of the nozzle bracket and fixedly connected to the lime water nozzle, the fourth bevel gear is sleeved on the outside of the nozzle bracket and fixedly connected to the exhaust gas nozzle, and the third bevel gear is located between the second bevel gear and the fourth bevel gear, and meshes with both the second bevel gear and the fourth bevel gear simultaneously.

[0014] Preferably, the desulfurization and denitrification equipment includes a cleaning brush; the cleaning brush is located inside the reaction tank and can reciprocate along the inner wall of the reaction tank;

[0015] The desulfurization and denitrification method for industrial waste gas also includes step S3, cleaning the inner wall of the reaction tank: driving the cleaning brush to move back and forth along the inner wall of the reaction tank to clean the inner wall of the reaction tank.

[0016] Preferably, the cleaning brush is connected to the lime water nozzle and moves inside the reaction vessel along with the lime water nozzle.

[0017] Preferably, the desulfurization and denitrification equipment includes a screw, a slider, a slide bar, an internal gear ring, a first spur gear, a fifth bevel gear, a sixth bevel gear, and a seventh bevel gear; the screw is fixedly connected to the lime water nozzle along the height direction of the reaction tank; the slider is threadedly connected to the screw; the cleaning brush is fixed to the slider; the internal gear ring is fixed inside the reaction tank; the first spur gear is rotatably connected to the lime water nozzle and meshes with the internal gear ring; the fifth bevel gear is coaxially fixedly connected to the first spur gear; the seventh bevel gear is parallel to the fifth bevel gear and rotatably sleeved on the outside of the screw; the sixth bevel gear is located between the fifth and seventh bevel gears and meshes with both; the slide bar is parallel to the screw and one end is fixedly connected to the sixth bevel gear, while the other end passes through the slider.

[0018] Preferably, the desulfurization and denitrification equipment includes a cleaning comb, and the cleaning comb is fixed in the screw at one end near the liquid outlet.

[0019] Preferably, the desulfurization and denitrification equipment includes a nozzle; the nozzle is located at the lime water nozzle and is capable of reciprocating relative to the lime water nozzle to clear the nozzle orifice of the lime water nozzle, and / or, the nozzle is located at the exhaust gas nozzle and is capable of reciprocating relative to the exhaust gas nozzle to clear the nozzle orifice of the exhaust gas nozzle; the desulfurization and denitrification method for industrial exhaust gas further includes step S4, nozzle clearing: controlling the nozzle to reciprocate relative to the lime water nozzle and / or the exhaust gas nozzle, so that the nozzle reciprocates through the nozzle orifice of the lime water nozzle and / or the nozzle orifice of the exhaust gas nozzle.

[0020] Preferably, the desulfurization and denitrification equipment includes a first ejector pin frame, a second ejector pin frame, and a drive unit; one end of the first ejector pin frame is slidably mounted on the lime water nozzle in a vertical direction, and the other end is provided with an ejector pin; one end of the second ejector pin frame is slidably connected to the first ejector pin frame in a circumferential direction, and the other end is slidably mounted on the exhaust gas nozzle in a vertical direction and is provided with an ejector pin; the drive unit is connected to the first ejector pin frame or the second ejector pin frame to drive the first ejector pin frame to reciprocate relative to the lime water nozzle and to drive the second ejector pin frame to reciprocate relative to the exhaust gas nozzle.

[0021] Preferably, the desulfurization and denitrification equipment includes a pin and a pin elastic element, and the pin is a spiral pin; the pin is disposed on the lime water nozzle and the exhaust gas nozzle, the pin is slidably disposed along the diameter direction of the nozzle, the pin elastic element is connected to the pin to drive the pin to move to its free end to form contact with the pin, and the free end of the pin adopts a front arc shape and a rear right angle structure design.

[0022] The desulfurization and denitrification method for industrial waste gas of the present invention has the following beneficial technical effects:

[0023] 1. In the desulfurization and denitrification method for industrial waste gas of the present invention, lime water and waste gas are output by rotating lime water nozzles and waste gas nozzles respectively, and the lime water is placed above the waste gas, so that they cross contact during the falling of lime water and the rising of waste gas, thereby forming a sufficient mixing contact, so that the lime water and waste gas can react fully. At the same time, the upward thrust generated when the waste gas is sprayed out forms a support for the small droplets of lime water output by the lime water nozzle, increasing the falling time of lime water in the air, further increasing the contact reaction time between lime water and waste gas, improving the utilization rate of lime water, and improving the desulfurization and denitrification effect on industrial waste gas.

[0024] 2. In the desulfurization and denitrification method for industrial waste gas of the present invention, by setting pins on the lime water nozzle and the waste gas nozzle respectively, and by driving the pins relative to the lime water nozzle and the waste gas nozzle, the nozzle holes of the lime water nozzle and the waste gas nozzle can be reciprocated and cleared, so as to ensure the normal output of lime water and waste gas and improve the treatment effect of industrial waste gas.

[0025] 3. In the desulfurization and denitrification method for industrial waste gas of the present invention, by selecting a pin with a spiral structure and setting pins and pin elastic elements on the lime water nozzle and the waste gas nozzle respectively, not only can the online unblocking operation of the lime water nozzle and the waste gas nozzle be realized, but also the pin can be vibrated to unblock, thereby improving the unblocking effect of the lime water nozzle and the waste gas nozzle.

[0026] 4. In the desulfurization and denitrification method for industrial waste gas of the present invention, a screw is set to drive the cleaning brush to rotate around the center of the reaction tank. At the same time, the slider and slide rod drive the cleaning brush to rotate relative to the screw, so that the cleaning brush can clean the inner wall of the reaction tank. This replaces manual labor to realize real-time automatic cleaning of the inner wall of the reaction tank, reducing manpower and lowering the operational risks for workers.

[0027] 5. In the desulfurization and denitrification method for industrial waste gas of the present invention, by setting a cleaning comb at the lower end of the screw, and using the cleaning brush to move to the lower end of the screw and rotate relative to the screw, the cleaning comb can be used to comb and clean the cleaning brush during the rotation process, thereby achieving self-cleaning of the cleaning brush, increasing the service life of the cleaning brush, and improving the cleaning effect on the inner wall of the reaction tank.

[0028] 6. In the desulfurization and denitrification method for industrial waste gas of the present invention, by setting a slider on the screw to drive the cleaning brush to reciprocate, and setting the ejector pin on the first ejector pin frame and the second ejector pin frame connected to each other, the contact between the slider and the first ejector pin frame during the reciprocating movement of the slider along the screw can realize the reciprocating movement of the ejector pin relative to the lime water nozzle and the waste gas nozzle under the cooperation of the drive spring, thereby realizing the unblocking operation of the nozzle, thus eliminating the need for a separate power element to drive the ejector pin, simplifying the structural design and reducing costs. Attached Figure Description

[0029] Figure 1 This is a schematic cross-sectional view of the desulfurization and denitrification equipment in this embodiment;

[0030] Figure 2 for Figure 1 Schematic diagram of the structure along the AA direction;

[0031] Figure 3 for Figure 1 Schematic diagram of the structure along the BB direction;

[0032] Figure 4 for Figure 1 Schematic diagram of the structure along the CC direction;

[0033] Figure 5 for Figure 1 Enlarged schematic diagram of the local structure at point I;

[0034] Figure 6 for Figure 1 A magnified schematic diagram of the local structure at point II. Detailed Implementation

[0035] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] Combination Figures 1 to 6 As shown in the figure, this embodiment discloses a desulfurization and denitrification device for treating industrial waste gas, including a reaction tank 1, a lime water nozzle 2, and a waste gas nozzle 3. The reaction tank 1 is provided with a liquid inlet 4, a liquid outlet 5, a gas inlet 6, and a gas outlet 7. The liquid inlet 4 is connected to the inlet end of the lime water nozzle 2, the liquid outlet 5 is located at the bottom of the reaction tank 1, the gas inlet 6 is connected to the inlet end of the waste gas nozzle 3, and the gas outlet 7 is located at the top of the reaction tank 1. The lime water nozzle 2 is located inside the reaction tank 1, with its outlet end facing upwards and capable of reciprocating rotation inside the reaction tank 1. The waste gas nozzle 3 is located inside the reaction tank 1, with its outlet end facing upwards, located below the lime water nozzle 2, and capable of reciprocating rotation inside the reaction tank 1.

[0037] When using the desulfurization and denitrification equipment of this embodiment to treat waste gas, rotating lime water nozzles and waste gas nozzles are used to output lime water and waste gas respectively. The lime water is positioned above the waste gas, so that the lime water and waste gas can cross-contact each other during the falling process and the rising process, thus forming a sufficient mixing contact. This allows the lime water and waste gas to fully react and react. Furthermore, the upward thrust generated when the waste gas is sprayed out supports the small droplets of lime water output from the lime water nozzles, increasing the falling time of the lime water in the air, further increasing the contact reaction time between the lime water and waste gas, improving the utilization rate of lime water, and improving the desulfurization and denitrification effect on industrial waste gas.

[0038] Combination Figure 3 and Figure 4As shown, the reaction tank 1 in this embodiment is equipped with multiple lime water nozzles 2 and exhaust gas nozzles 3. The lime water nozzles 2 have a hollow structure and multiple upward-facing nozzles 2a for outputting lime water. The exhaust gas nozzles 3 also have a hollow structure and multiple upward-facing nozzles 3a for outputting exhaust gas. The multiple lime water nozzles 2 and exhaust gas nozzles 3 are evenly distributed along the circumference of the reaction tank 1, thereby increasing the amount of lime water and exhaust gas output into the reaction tank 1 and improving the uniformity of the distribution of lime water and exhaust gas in the reaction tank 1, thus improving the effect of uniform contact and mixing of lime water and exhaust gas.

[0039] Combination Figure 1 and Figure 2 As shown, the desulfurization and denitrification equipment in this embodiment also includes a nozzle support 8 and a drive motor 9. The nozzle support 8 is located inside the reaction tank 1, with its upper end extending horizontally to the outside of the reaction tank 1 and forming a fixed connection with it. Inside the nozzle support 8, there is a liquid inlet channel 81 communicating with the liquid inlet 4 and an air inlet channel 10 communicating with the air inlet 6. A lime water nozzle 2 is fitted onto the lower end of the nozzle support 8 and can reciprocate relative to the nozzle support 8. The nozzle orifice 2a is connected to the liquid inlet channel 81 via an annular groove, allowing lime water to flow into the lime water nozzle 2 through the liquid inlet 4 and the liquid inlet channel 81 and then be sprayed out. An exhaust gas nozzle 3 is also fitted onto the lower end of the nozzle support 8 and can reciprocate relative to the nozzle support 8. The nozzle orifice 3a is connected to the air inlet channel 10 via an annular groove, allowing exhaust gas to flow into the exhaust gas nozzle 3 through the air inlet 6 and the air inlet channel 10 and then be sprayed out. The drive motor 9 is fixed to the outside of the reaction tank 1 and connected to the lime water nozzle 2 and the exhaust gas nozzle 3 to drive the lime water nozzle 2 and the exhaust gas nozzle 3 to rotate.

[0040] At this point, the lime water nozzle and the exhaust gas nozzle can be suspended and fixed inside the reaction tank using the nozzle bracket, and the drive motor can drive the lime water nozzle and the exhaust gas nozzle to rotate respectively, so as to output lime water and exhaust gas.

[0041] Specifically, the desulfurization and denitrification equipment in this embodiment also includes a drive gear 11, a first bevel gear 12, a second bevel gear 13, a third bevel gear 14, and a fourth bevel gear 15. The drive gear 11 is sleeved and fixedly mounted on the output shaft of the drive motor 9. The first bevel gear 12 is sleeved on the nozzle support 8 and coaxially fixedly connected to the lime water nozzle 2, with the drive gear 11 meshing with the first bevel gear 12. The second bevel gear 13 is also sleeved on the outside of the nozzle support 8 and fixedly connected to the lime water nozzle 2. The fourth bevel gear 15 is also sleeved on the outside of the nozzle support 8 and fixedly connected to the exhaust gas nozzle 3. The third bevel gear 14 is rotatably connected to the nozzle support 8 and simultaneously meshes with both the second bevel gear 13 and the fourth bevel gear 15.

[0042] At this time, the drive motor directly drives the lime water nozzle to rotate around the nozzle support through the drive gear and the first bevel gear. Then, the lime water nozzle drives the exhaust gas nozzle to rotate synchronously in the opposite direction through the second bevel gear, the third bevel gear and the fourth bevel gear. That is, the lime water nozzle and the exhaust gas nozzle rotate synchronously in the opposite direction, thereby further improving the contact effect between the sprayed lime water droplets and the exhaust gas, and improving the desulfurization and denitrification treatment effect of the exhaust gas.

[0043] Combination Figure 1 As shown, the desulfurization and denitrification equipment in this embodiment also includes a cleaning brush 16. The cleaning brush 16 is located inside the reaction tank 1 and can reciprocate along the inner wall of the reaction tank 1. At this time, the cleaning brush can be used to clean the lime water sprayed onto the inner wall of the reaction tank and the precipitate formed by the reaction of lime water and exhaust gas, thereby achieving the cleaning operation of the inner wall of the reaction tank.

[0044] In this embodiment, the cleaning brush 16 is connected to the lime water nozzle 2, so that the cleaning brush 16 moves with the lime water nozzle 2 inside the reaction tank 1 to achieve synchronous cleaning of the inner wall of the reaction tank 1.

[0045] Specifically, the desulfurization and denitrification equipment in this embodiment also includes a screw 17, a slider 18, a slide bar 19, an internal gear ring 20, a first spur gear 21, a fifth bevel gear 22, a sixth bevel gear 23, and a seventh bevel gear 24. The screw 17 is fixedly connected along the height of the reaction vessel 1 to the horizontal extension arm 25 in the lime water nozzle 2. The slider 18 is threadedly connected to the screw 17. The cleaning brush 16 is wound and fixed on the outer circumferential surface of the slider 18. The internal gear ring 20 is fixed inside the reaction vessel 1. The first spur gear 21 is rotatably connected to the extension arm 25 and meshes with the internal gear ring 20. The fifth bevel gear 22 is coaxially fixedly connected to the first spur gear 21. The seventh bevel gear 24 is located on the lower surface of the extension arm 25, parallel to the fifth bevel gear 22, and rotatably sleeved on the outside of the screw 17. The sixth bevel gear 23 meshes with both the fifth bevel gear 22 and the seventh bevel gear 24. The slide rod 19 is parallel to the screw 17 and its upper end is fixedly connected to the sixth bevel gear 23. Its lower end passes through the slider 18 and forms a sliding connection with the slider 18.

[0046] At this time, during the reciprocating rotation of the lime water nozzle, the meshing connection between the internal gear ring and the first spur gear, as well as the meshing transmission connection between the fifth, sixth, and seventh bevel gears, can synchronously drive the slide bar to reciprocate around the screw, thereby driving the slider to reciprocate along the screw, and in turn driving the cleaning brush to reciprocate along the height direction of the reaction tank. At the same time, the slider also drives the cleaning brush to rotate inside the reaction tank as the lime water nozzle rotates, ultimately realizing the movement of the cleaning brush inside the reaction tank and achieving the cleaning operation of the inner wall of the reaction tank.

[0047] Combination Figure 1 and Figure 6 As shown, in the desulfurization and denitrification equipment of this embodiment, a cleaning comb 26 is also provided, and the cleaning comb 26 is fixed in the screw 17 at one end near the liquid outlet 5, that is, at the bottom of the reaction tank 1.

[0048] At this point, when the cleaning brush moves with the slider to the lower end of the screw, it will come into contact with the cleaning comb and rotate relative to it. The cleaning comb will then clean the cleaning brush, removing impurities and improving the cleaning effect of the cleaning brush on the reaction vessel.

[0049] Preferably, in the process of desulfurizing and denitrifying waste gas using the desulfurization and denitrification equipment of this embodiment, the liquid outlet is kept closed first. After the liquid level in the reaction tank reaches a certain height, the liquid outlet is opened to discharge the lime water after the reaction. At this time, the cleaning comb can be extended below the liquid level, so that the impurities on the cleaning brush can be directly combed into the liquid, thereby improving the cleaning efficiency of the cleaning brush.

[0050] Combination Figure 1 , Figure 2 and Figure 5 As shown, the desulfurization and denitrification equipment in this embodiment also includes ejector pins 27. Multiple ejector pins 27 are respectively disposed on the lime water nozzle 2 and the exhaust gas nozzle 3, and can reciprocate relative to the lime water nozzle 2 and the exhaust gas nozzle 3, respectively, thereby clearing the nozzle 2a of the lime water nozzle 2 and the nozzle 3a of the exhaust gas nozzle 3.

[0051] At this time, by controlling the reciprocating motion of the ejector pin, the lime water nozzle and the exhaust gas nozzle can be cleared in real time to prevent the nozzle from being blocked, ensuring the continuous and smooth output of lime water and exhaust gas, thereby ensuring the effectiveness of desulfurization and denitrification treatment of the exhaust gas.

[0052] In this embodiment, the desulfurization and denitrification equipment also includes a first ejector pin holder 28, a second ejector pin holder 29, and a drive spring 30. The upper end of the first ejector pin holder 28 is slidably mounted vertically on the lime water nozzle 2, and the lower end is provided with multiple ejector pins 27 sequentially corresponding to the distribution positions of the spray holes 2a on the lime water nozzle 2. The upper end of the second ejector pin holder 29 is slidably connected to the lower end of the first ejector pin holder 28 in a circumferential direction, allowing them to move synchronously along the height of the reaction tank 1 and rotate relative to each other in a circumferential direction. The lower end of the second ejector pin holder 29 is slidably mounted vertically on the exhaust gas nozzle 3, and multiple ejector pins 27 are sequentially provided along the distribution positions of the spray holes 3a on the exhaust gas nozzle 3. The drive spring 30 is sleeved between the second ejector pin holder 29 and the exhaust gas nozzle 3 to drive the second ejector pin holder 29 to move away from the exhaust gas nozzle 3. During the upward movement of the slider 18 along the screw 17, it can form contact with the first ejector pin holder 28 and drive the first ejector pin holder 28 and the second ejector pin holder 29 to move upward synchronously against the force of the drive spring 30, that is, drive the second ejector pin holder 29 to move closer to the exhaust gas nozzle 3.

[0053] At this time, as the lime water nozzle and the exhaust gas nozzle rotate synchronously in opposite directions, causing the slider to move upward along the screw, when the slider comes into contact with the first ejector pin holder and drives the first and second ejector pin holders to move upward against the force of the drive spring, the ejector pins can be inserted into the nozzle holes of the lime water nozzle and the exhaust gas nozzle. As the slider moves downward along the screw again, the first and second ejector pin holders, under the restoring force of the drive spring, drive the ejector pins to move out of the nozzle holes of the lime water nozzle and the exhaust gas nozzle, thereby realizing the reciprocating unblocking operation of the ejector pins on the lime water nozzle and the exhaust gas nozzle.

[0054] Furthermore, the desulfurization and denitrification equipment in this embodiment also includes a pin 31 and a pin elastic element 32, and the ejector pin 27 is a spiral ejector pin. The pin 31 is horizontally positioned on the lime water nozzle 2 and the exhaust gas nozzle 3, and the pin 31 can reciprocate along the diameter of the nozzle. The pin elastic element 32 is a spiral spring connected to the pin 31 to drive the pin 31 to move until its free end contacts the ejector pin 27. The free end of the pin 31 has a front arc shape and a rear right angle structure.

[0055] At this point, not only can the online unblocking operation of the lime water nozzle and the exhaust gas nozzle be achieved by using the spiral structure of the ejector pin, that is, during the process of the spiral ejector pin penetrating the nozzle, the normal output of lime water and exhaust gas by the lime water nozzle and the exhaust gas nozzle can be maintained respectively, but also, during the reciprocating movement of the ejector pin with the spiral structure under the combined action of the first ejector pin frame, the second ejector pin frame, and the drive spring, the pin moves back and forth relative to the ejector pin under the action of the drive spring and the spiral structure on the ejector pin, thereby forming a continuous impact operation on the ejector pin, causing the ejector pin to vibrate, and thus breaking up and cleaning the impurities blocking the nozzle, further improving the unblocking effect of the lime water nozzle and the exhaust gas nozzle.

[0056] Combination Figures 1 to 6 As shown, the operation of desulfurization and denitrification treatment of industrial waste gas using the desulfurization and denitrification equipment in this embodiment specifically includes the following steps:

[0057] Step S1, Start-up: Drive the lime water nozzle and the exhaust gas nozzle to rotate inside the reaction tank.

[0058] Specifically, connect the lime water pipeline to the inlet 4, the exhaust gas pipeline to the inlet 6, the lime water recovery pipeline to the outlet 5, and the exhaust gas recovery pipeline to the outlet 7. Start the drive motor 9, which drives the lime water nozzle 2 to rotate via the drive gear 11 and the first bevel gear 12, and then drives the exhaust gas nozzle 3 to rotate synchronously in the opposite direction via the second bevel gear 13, the third bevel gear 14, and the fourth bevel gear 15.

[0059] Step S2, desulfurization and denitrification of waste gas: Lime water is guided to the lime water nozzle through the liquid inlet and sprayed into the reaction tank to form small lime water droplets; waste gas is guided to the waste gas nozzle through the air inlet and sprayed into the reaction tank below the lime water nozzle, so that the falling lime water droplets and the upward flowing waste gas form a contact reaction to desulfurize and denitrify the waste gas. The waste gas that has completed the desulfurization and denitrification treatment is discharged through the air outlet.

[0060] Specifically, firstly, the inlet 4 is opened, and lime water is guided through the inlet 4 and the inlet channel 81 to the lime water nozzle 2. Then, the lime water is sprayed upward through the nozzle 2a of the lime water nozzle 2, forming small lime water droplets that fall into the reaction tank 1. When the lime water level in the reaction tank 1 reaches a certain height, the outlet 5 is opened, and the lime water is discharged through the outlet 5. At the same time, the inlet 6 is opened, and the waste gas is guided through the inlet 6 and the inlet channel 10 to the waste gas nozzle 3. Then, the waste gas is sprayed upward through the nozzle 3a of the waste gas nozzle 3, thus forming a contact reaction with the falling lime water droplets. Due to the upward spraying of the waste gas, an upward gas thrust is formed on the lime water droplets, increasing the falling resistance of the lime water droplets and prolonging the contact reaction time between the lime water droplets and the waste gas, completing the desulfurization and denitrification treatment of the waste gas. The desulfurization and denitrification treated waste gas is then discharged through the outlet 7.

[0061] Furthermore, it also includes step S3, cleaning the inner wall of the reaction vessel: driving the cleaning brush to move back and forth along the inner wall of the reaction vessel to clean the inner wall of the reaction vessel.

[0062] Specifically, during the rotation of the lime water nozzle 2, the meshing of the first spur gear 21 with the internal gear ring 20 drives the slide bar 19 to rotate around the screw 17 via the fifth bevel gear 22, the sixth bevel gear 23, and the seventh bevel gear 24. This drives the slider 18 to move the cleaning brush 16 back and forth along the length of the screw 17. The rotation of the screw 17 inside the reaction tank 1 is also driven by the lime water nozzle 2, which in turn drives the cleaning brush 16 to rotate inside the reaction tank 1 via the slider 18. This allows the cleaning brush 16 to move in a circumferential direction and in a vertical direction along the inner wall of the reaction tank 1, thus cleaning the inner wall of the reaction tank 1. When the rotation of the lime water nozzle 2 causes the cleaning brush 16 to move downwards along the length of the screw 17 with the slider 18, and the cleaning brush 16 moves below the liquid surface and contacts the cleaning comb 26, a relative rotation is formed between the cleaning brush 16 and the cleaning comb 26 during the rotation of the cleaning brush 16 around the screw 17. This allows the cleaning comb 26 to clean and comb the cleaning brush 16, leaving the combed-off impurities in the lime water liquid, which is then discharged through the outlet 5 along with the lime water. Afterwards, the drive motor 9 is controlled to rotate in the opposite direction, thereby driving the lime water nozzle 2 to rotate in the opposite direction, causing the cleaning brush 16 to begin moving upwards relative to the screw 17, thus cleaning the inner wall of the reaction tank 1 again.

[0063] Furthermore, it also includes step S4, nozzle unblocking: controlling the ejector pin to reciprocate relative to the lime water nozzle and / or exhaust gas nozzle, so that the ejector pin reciprocates through the nozzle of the lime water nozzle and / or the nozzle of the exhaust gas nozzle.

[0064] Specifically, during the rotation of the lime water nozzle 2, when the slider 18 moves upward along the screw 17 to contact the first ejector pin holder 28 and drives the first ejector pin holder 28 and the second ejector pin holder 29 to continue moving upward against the force of the drive spring 30, the first ejector pin holder 28 and the second ejector pin holder 29 respectively drive the ejector pin 27 to extend into the spray hole 2a of the lime water nozzle 2 and the spray hole 3a of the exhaust gas nozzle 3. When the drive motor 9 reverses the direction of rotation of the lime water nozzle 2, the slider 18 moves downward along the screw 17 to release the rotation. The upward force applied to the first ejector pin holder 28 causes the first ejector pin holder 28 and the second ejector pin holder 29 to move the ejector pin 27 downward under the restoring force of the drive spring 30. This moves the ejector pin 27 out of the spray hole 2a of the lime water nozzle 2 and the spray hole 3a of the exhaust gas nozzle 3. As the drive motor 9 drives the lime water nozzle 2 to reciprocate, the slider 18 and the drive spring 30 drive the ejector pin 27 to reciprocate through the spray hole 2a of the lime water nozzle 2 and the spray hole 3a of the exhaust gas nozzle 3, thus clearing the nozzles. During the reciprocating movement of the ejector pin 27 through the pin 31, the pin 31, under the action of the pin elastic element 32, continuously impacts the ejector pin 27, causing it to vibrate. This vibration breaks up and cleans the impurities clogging the nozzles, further improving the clearing effect on the nozzles.

[0065] In addition, step S5 is included, which is a cyclical process: by repeating the above steps S2 to S4, the waste gas is continuously and stably desulfurized and denitrified.

Claims

1. A method for desulfurization and denitrification of industrial waste gas, characterized in that, A desulfurization and denitrification device is used to treat industrial waste gas. This device includes a reaction tank, a lime water nozzle, and an exhaust gas nozzle. The reaction tank has a liquid inlet, a liquid outlet, an air inlet, and an air outlet. The liquid inlet is connected to the inlet end of the lime water nozzle, the liquid outlet is located at the bottom of the reaction tank, the air inlet is connected to the inlet end of the exhaust gas nozzle, and the air outlet is located at the top of the reaction tank. The lime water nozzle is located inside the reaction tank, with its outlet end facing upwards and capable of reciprocating rotation inside the reaction tank. The exhaust gas nozzle is also located inside the reaction tank, with its outlet end facing upwards, located below the lime water nozzle, and capable of reciprocating rotation inside the reaction tank. The desulfurization and denitrification method for this industrial waste gas specifically includes the following steps: Step S1, Start-up: Drive the lime water nozzle and the exhaust gas nozzle to rotate inside the reaction tank respectively; Step S2, desulfurization and denitrification of waste gas: Lime water is guided to the lime water nozzle through the liquid inlet and sprayed into the reaction tank to form small lime water droplets; waste gas is guided to the waste gas nozzle through the air inlet and sprayed upward into the reaction tank below the lime water nozzle, so that the falling lime water droplets and the upward flowing waste gas form a contact reaction to desulfurize and denitrify the waste gas. The waste gas that has completed the desulfurization and denitrification treatment is discharged through the air outlet. The desulfurization and denitrification equipment includes a nozzle support and a drive motor. The nozzle support is fixed inside the reaction tank and has a liquid inlet channel communicating with the liquid inlet and an air inlet channel communicating with the air inlet. The lime water nozzle is fitted on the nozzle support, can reciprocate relative to the nozzle support, and remains in communication with the liquid inlet channel. The exhaust gas nozzle is fitted on the nozzle support, can reciprocate relative to the nozzle support, and remains in communication with the air inlet channel. The drive motor is connected to the lime water nozzle and the exhaust gas nozzle to drive them to rotate. The desulfurization and denitrification equipment includes a second bevel gear, a third bevel gear, and a fourth bevel gear; the second bevel gear is sleeved on the outside of the nozzle bracket and fixedly connected to the lime water nozzle, the fourth bevel gear is sleeved on the outside of the nozzle bracket and fixedly connected to the exhaust gas nozzle, and the third bevel gear is located between the second bevel gear and the fourth bevel gear, and meshes with both the second bevel gear and the fourth bevel gear simultaneously.

2. The method for desulfurization and denitrification of industrial waste gas according to claim 1, characterized in that, The desulfurization and denitrification equipment includes a cleaning brush; the cleaning brush is located inside the reaction tank and can reciprocate along the inner wall of the reaction tank; The desulfurization and denitrification method for industrial waste gas also includes step S3, cleaning the inner wall of the reaction tank: driving the cleaning brush to move back and forth along the inner wall of the reaction tank to clean the inner wall of the reaction tank.

3. The method for desulfurization and denitrification of industrial waste gas according to claim 2, characterized in that, The cleaning brush is connected to the lime water nozzle and moves inside the reaction vessel along with the lime water nozzle.

4. The method for desulfurization and denitrification of industrial waste gas according to claim 3, characterized in that, The desulfurization and denitrification equipment includes a screw, a slider, a slide bar, an internal gear ring, a first spur gear, a fifth bevel gear, a sixth bevel gear, and a seventh bevel gear. The screw is fixedly connected to the lime water spray head along the height direction of the reaction tank. The slider is threadedly connected to the screw. The cleaning brush is fixed to the slider. The internal gear ring is fixed inside the reaction tank. The first spur gear is rotatably connected to the lime water spray head and meshes with the internal gear ring. The fifth bevel gear is coaxially fixedly connected to the first spur gear. The seventh bevel gear is parallel to the fifth bevel gear and rotatably sleeved on the outside of the screw. The sixth bevel gear is located between the fifth and seventh bevel gears and meshes with both of them. The slide bar is parallel to the screw, with one end fixedly connected to the sixth bevel gear and the other end passing through the slider.

5. The method for desulfurization and denitrification of industrial waste gas according to claim 4, characterized in that, The desulfurization and denitrification equipment includes a cleaning comb, and the cleaning comb is fixed in the screw at one end near the liquid outlet.

6. The method for desulfurization and denitrification of industrial waste gas according to claim 1, characterized in that, The desulfurization and denitrification equipment includes a push pin; the push pin is located at the lime water nozzle and can reciprocate relative to the lime water nozzle to clear the nozzle orifice of the lime water nozzle, and / or, the push pin is located at the exhaust gas nozzle and can reciprocate relative to the exhaust gas nozzle to clear the nozzle orifice of the exhaust gas nozzle. The desulfurization and denitrification method for industrial waste gas also includes step S4, nozzle unblocking: controlling the ejector pin to reciprocate relative to the lime water nozzle and / or the waste gas nozzle, so that the ejector pin reciprocates through the nozzle of the lime water nozzle and / or the nozzle of the waste gas nozzle.

7. The method for desulfurization and denitrification of industrial waste gas according to claim 6, characterized in that, The desulfurization and denitrification equipment includes a first ejector pin frame, a second ejector pin frame, and a drive unit; one end of the first ejector pin frame is slidably mounted on the lime water nozzle in a vertical direction, and the other end is provided with an ejector pin; one end of the second ejector pin frame is slidably connected to the first ejector pin frame in a circumferential direction, and the other end is slidably mounted on the exhaust gas nozzle in a vertical direction and is provided with an ejector pin; the drive unit is connected to the first ejector pin frame or the second ejector pin frame to drive the first ejector pin frame to reciprocate relative to the lime water nozzle and to drive the second ejector pin frame to reciprocate relative to the exhaust gas nozzle.

8. The method for desulfurization and denitrification of industrial waste gas according to claim 7, characterized in that, The desulfurization and denitrification equipment includes pins and pin elastic elements. The pin is a spiral pin. The pin is disposed on the lime water nozzle and the exhaust gas nozzle. The pin is slidably disposed along the diameter direction of the nozzle. The pin elastic element is connected to the pin to drive the pin to move to its free end to form contact with the pin. The free end of the pin adopts a front arc shape and a rear right angle structure design.

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