A concentrated liquid return spray gun for nitrogen reduction in waste incinerators

Abstract

This invention relates to the technical field of waste incineration equipment, and provides a concentrated liquid return spray gun for nitrogen reduction in waste incinerators, comprising: a gun body having an inner and outer inlet pipe for concentrated liquid and an outer inlet pipe for compressed gas; a nozzle movably disposed at the outlet end of the inlet pipe for spraying concentrated liquid; and an atomizer movably disposed at the outlet end of the inlet pipe and located around the nozzle for atomizing the concentrated liquid for combustion in the waste incinerator; wherein, the nozzle can rotate forward around the gun body axis under the hydraulic propulsion of the concentrated liquid, and the atomizer can rotate counterclockwise around the gun body axis under the pneumatic propulsion of the compressed gas. The nozzle and atomizer of this invention, through relative forward and counterclockwise rotation, cause the concentrated liquid sprayed in a forward spiral to collide and cut with the compressed gas blown out in a counterclockwise spiral, thereby improving the atomization effect of the concentrated liquid and effectively solving problems such as difficulty in igniting waste, uneven feeding in the incinerator, and uneven combustion.

Description

Technical Field

[0001] This invention relates to the field of waste incineration equipment technology, specifically to a concentrated liquid return spray gun for reducing nitrogen in a waste incinerator. Background Technology

[0002] During storage, transfer, transportation, and stockpiling, waste generates various metabolic substances and water due to fermentation, organic matter decomposition, and rainwater leaching, forming highly concentrated organic wastewater with extremely complex composition—landfill leachate. Many waste incineration plants are equipped with leachate treatment stations, which typically employ a "pretreatment + anaerobic digestion + MBR (membrane bioreactor) + NF / RO (nanofiltration / reverse osmosis)" process. The NF / RO unit is a membrane separation process that produces approximately 20%–30% post-membrane concentrate. This concentrate contains a large amount of recalcitrant and non-biodegradable organic matter and salts, exhibiting extremely poor biodegradability; especially the RO concentrate, which contains a high concentration of monovalent salts. Therefore, treating the post-membrane concentrate (referred to as concentrate in this invention) is challenging. With increasingly stringent environmental standards and inspections in my country, many waste incineration plants are required to implement "zero discharge" standards, meaning that these concentrates must be completely treated and disposed of within the waste incineration plant and not discharged externally.

[0003] Currently, the industry mainly uses a spray gun to inject the concentrated liquid back into the waste incinerator for incineration. This not only completely eliminates the concentrated liquid generated during the leachate treatment process, achieving "zero emissions" of the concentrated liquid, but also reduces the concentration of nitrogen oxides in the flue gas during waste incineration at the source to meet relevant emission standards.

[0004] The key to concentrated liquid re-injection is to ensure that the concentrated liquid is fully atomized in order to reduce its impact on the combustion conditions of the incinerator (such as the temperature inside the furnace). However, due to the limitations of its own structure, the existing spray gun has poor atomization effect, often resulting in problems such as difficulty in igniting waste, uneven feeding in the incinerator, and uneven combustion. Moreover, the concentrated liquid is prone to accumulate in the nozzle, which significantly increases the risk of internal blockage or malfunction of the spray gun. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a concentrated liquid return spray gun for nitrogen reduction in waste incinerators. This solves the problems of poor atomization effect due to the limitations of the existing spray gun's structure, which often leads to difficulties in igniting waste, uneven feeding in the incinerator, and uneven combustion. Furthermore, the concentrated liquid tends to accumulate in the nozzle, significantly increasing the risk of internal blockage or malfunction of the spray gun.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A concentrated liquid return spray gun for nitrogen reduction in a waste incinerator includes:

[0008] The gun body has an inner and outer concentrator inlet pipe for liquid concentrate and an outer gas inlet pipe for compressed gas.

[0009] A nozzle, movably mounted at the outlet end of the inlet pipe, is used to spray out the concentrate; and

[0010] Atomizer, movably mounted at the outlet end of the air inlet pipe and located around the nozzle, is used to atomize concentrated liquid for incineration in the waste incinerator.

[0011] The nozzle can rotate forward around the gun body axis under the hydraulic force of the concentrated liquid, and the atomizer can rotate in the opposite direction around the gun body axis under the pneumatic force of the compressed gas.

[0012] Optionally, the nozzle includes a first ring, a cylindrical tube, and a hemispherical end cap arranged sequentially.

[0013] The first ring is rotatably mounted in an inwardly recessed step at the outlet end of the liquid inlet pipe. A plurality of circumferentially distributed guide plates are connected to the side of the first ring away from the cylindrical tube. Each guide plate extends into the interior of the liquid inlet pipe and has a first blade on it. The first blade extends radially along the liquid inlet pipe and is inclined toward the outlet end of the liquid inlet pipe.

[0014] Multiple circumferentially distributed first spray holes are provided at the connection between the cylindrical tube and the hemispherical head, and the spray direction of the first spray holes is perpendicular to the axis of the liquid inlet pipe.

[0015] The hemispherical end cap is provided with a plurality of circumferentially distributed second spray holes, and the spray direction of the second spray holes forms a 45° angle with the axial direction of the liquid inlet pipe.

[0016] Optionally, the first blade is disposed on the inner side of the guide plate;

[0017] The outer side of the guide plate is arc-shaped and extends axially along the inlet pipe to be close to the inner circumference of the inlet pipe, for scraping off the concentrate adhering to the inner circumference of the inlet pipe and guiding it.

[0018] Optionally, the side of the first ring away from the cylindrical tube is also connected to a plurality of circumferentially distributed stirring rods;

[0019] The stirring rod extends axially along the liquid inlet pipe for a certain length and then bends radially inward toward the liquid inlet pipe to form an L-shaped structure.

[0020] The L-shaped stirring rod is located behind the first blade and is spaced apart from the guide plate.

[0021] Optionally, the outlet end of the inlet pipe is detachably connected to a pressure sleeve with the same outer diameter as the inlet pipe;

[0022] The pressure sleeve is provided with a first retaining ring;

[0023] The inner side of the first retaining ring slides in contact with the side of the first ring facing the cylindrical tube;

[0024] The outer circumferential wall of the cylindrical tube slides into the inner circumferential wall of the first retaining ring.

[0025] Optionally, the atomizer includes a second ring and an atomizing cover connected to each other;

[0026] The second ring is rotatably mounted in an inwardly recessed step at the outlet end of the air intake pipe. The second ring has multiple circumferentially distributed second blades with a twisting direction opposite to that of the first blade. The second blades extend radially along the air intake pipe and are inclined toward the outlet end of the air intake pipe.

[0027] The atomizing hood is located around the hemispherical head to cover the first and second spray holes, and the area between the hood and the hemispherical head forms a first atomizing channel. The outlet of the first atomizing channel is located in the middle of the atomizing hood and is coaxial with the hemispherical head.

[0028] Optionally, it also includes an end cap, which is provided with a straight cylindrical portion and a conical cylindrical portion in sequence;

[0029] The straight cylindrical part has the same outer diameter as the air inlet pipe and is detachably connected to the outlet end of the air inlet pipe. A second retaining ring is provided on the inner side of the connection between the straight cylindrical part and the conical part. The side of the second retaining ring away from the conical part slides and engages with the side of the second ring facing the atomizing shroud to block the atomizer and prevent it from axially shifting when it rotates in the opposite direction around the gun body axis.

[0030] The conical section is located around the atomizing hood to form a second atomizing channel in the area between the two. The outlet of the second atomizing channel is opened at the middle of the small end of the conical section and is coaxial with the atomizing hood. The inner diameter of the outlet of the second atomizing channel is smaller than the inner diameter of the outlet of the first atomizing channel to form a confluence area between the two.

[0031] The atomizing cover is fixedly connected to the second ring by multiple circumferentially distributed connecting rods. The atomizing cover has multiple circumferentially distributed and inclined diverting plates on one side facing the second ring. The diverting plates are arranged at intervals with the connecting rods and correspond one-to-one with the second blades to compress the gas flow.

[0032] Optionally, the atomizing cover is provided with a plurality of circumferentially distributed first through holes and second through holes;

[0033] The first through hole and the second through hole correspond one-to-one with the first spray hole and the second spray hole, respectively, and the diameter of the first two holes is larger than that of the latter two holes.

[0034] Optionally, the gun body is fixedly installed on the furnace body of the waste incinerator via a flange tube;

[0035] The flange includes a flange and a sleeve connected to the middle of the flange. After the gun body is inserted into the furnace body, the flange is fixedly connected to the furnace body. The sleeve is sleeved on the air inlet pipe and located between the inlet end and the outlet end of the air inlet pipe.

[0036] Optionally, a pair of sliding grooves are provided on the inner circumferential sidewall of the sleeve, and a pair of guide rails are provided on the outer circumferential sidewall of the air intake pipe along its axial direction, and the guide rails are slidably connected to the sliding grooves;

[0037] The sleeve is threaded with a screw, which is arranged radially along the sleeve and is used to lock the sleeve to the air inlet pipe.

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] 1. The nozzles and atomizers are designed to rotate in opposite directions, causing the concentrated liquid sprayed in the forward spiral to collide and cut with the compressed gas blown out in the reverse spiral. This improves the atomization effect of the concentrated liquid and effectively solves problems such as difficulty in igniting waste, uneven material distribution in the incinerator, and uneven combustion.

[0040] 2. Through the combined action of the guide plate and the first blade, as well as the stirring action of the stirring rod, the concentrated liquid adhering to the inner circumference of the inlet pipe can be scraped off and the liquid can be stirred more vigorously to reduce its sedimentation in the inlet pipe, thereby effectively preventing the risk of blockage inside the nozzle.

[0041] 3. By using the first retaining ring to abut against the first circular ring to block the axial movement of the nozzle, the stability of the nozzle rotation can be improved, thereby ensuring the atomization effect of the concentrate; at the same time, the outer diameter of the pressure sleeve is equal to the outer diameter of the liquid inlet pipe, which can reduce the resistance of the compressed gas flow in the air inlet pipe, thereby ensuring the atomization efficiency (effective utilization rate) of the compressed gas.

[0042] 4. The first atomizing channel between the atomizing hood and the hemispherical head, and the confluence area between the outlet of the first atomizing channel and the outlet of the second atomizing channel, can extend the sufficient contact time between the concentrate and the compressed gas, thereby effectively improving the atomization effect of the concentrate.

[0043] 5. Through the first atomizing channel, the second atomizing channel, and the confluence zone between the outlet of the first atomizing channel and the outlet of the second atomizing channel, the sufficient contact time between the concentrate and the compressed gas can be further extended to achieve tertiary atomization, thereby further improving the atomization effect of the concentrate. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0046] Figure 2 This is a schematic diagram of the main cross-section of the present invention;

[0047] Figure 3 for Figure 2 A magnified schematic diagram of section A in the middle;

[0048] Figure 4 Schematic diagram of the nozzle's three-dimensional structure Figure 1 ;

[0049] Figure 5 Schematic diagram of the nozzle's three-dimensional structure Figure 2 ;

[0050] Figure 6 This is a schematic diagram of the three-dimensional structure of the pressure sleeve;

[0051] Figure 7 Schematic diagram of the three-dimensional structure of the atomizer Figure 1 ;

[0052] Figure 8 Schematic diagram of the three-dimensional structure of the atomizer Figure 2 ;

[0053] Figure 9 This is a three-dimensional structural diagram of the end cap;

[0054] Figure 10 This is a three-dimensional structural diagram of a flange pipe. Detailed Implementation

[0055] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0060] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention.

[0061] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0062] See Figures 1-10As shown, the present invention provides a concentrated liquid return spray gun for nitrogen reduction in a waste incinerator, comprising:

[0063] The gun body 100 has an inner and outer liquid inlet pipe 110 for concentrated liquid and an outer gas inlet pipe 120 for compressed gas.

[0064] Nozzle 200, movably mounted at the outlet end of inlet pipe 110, is used to spray concentrated liquid; and

[0065] Atomizer 300 is movably mounted at the outlet end of air inlet pipe 120 and located around nozzle 200, and is used to atomize concentrated liquid for incineration in waste incinerator.

[0066] The nozzle 200 can rotate in the forward direction (counterclockwise) around the axis of the gun body 100 under the hydraulic propulsion of the concentrate, while the atomizer 300 can rotate in the reverse direction (clockwise) around the axis of the gun body 100 under the pneumatic propulsion of the compressed gas.

[0067] Specifically, the inlet end of the liquid inlet pipe 110 is coaxial with the outlet end, and the inlet end is used to introduce the concentrate; the end of the air inlet pipe 120 facing the inlet end of the liquid inlet pipe 110 is closed (in this embodiment, this end is sealed and welded together with the outer circumferential wall of the liquid inlet pipe 110 by an annular ring); the inlet end of the air inlet pipe 120 is perpendicular to the outlet end, and its inlet end is set close to its closed end, and this inlet end is used to introduce compressed gas.

[0068] See Figures 3-5As shown, the nozzle 200 includes a first ring 210, a cylindrical tube 220, and a hemispherical end cap 230 arranged sequentially. The first ring 210 is rotatably mounted in an inwardly recessed step at the outlet end of the inlet pipe 110 (for example, a bearing can be installed at this step, and the inner ring of the bearing is fixedly connected to the first ring 210). A plurality of circumferentially distributed guide plates 240 are connected to the side of the first ring 210 away from the cylindrical tube 220, and each guide plate 240 extends into the inlet pipe 110. The cylindrical tube 220 is provided with a first blade 241, which extends radially along the inlet pipe 110 and is inclined toward the outlet end of the inlet pipe 110. Multiple circumferentially distributed first nozzles 221 are provided at the connection between the cylindrical tube 220 and the hemispherical end cap 230. The spray direction of the first nozzles 221 is perpendicular to the axial direction of the inlet pipe 110. Multiple circumferentially distributed second nozzles 231 are provided on the hemispherical end cap 230. The spray direction of the second nozzles 231 is at a 45° angle to the axial direction of the inlet pipe 110. The concentrated liquid flowing in the inlet pipe 110 impacts the first blade 241 from the front, causing the first blade 241 to deflect, thereby rotating the first ring 210, which in turn pushes the entire nozzle 200 to rotate in the forward direction around the axis of the gun body 100. The concentrated liquid flowing through the first blade 241 enters the cylindrical tube 220 and the hemispherical end cap 230 and is sprayed out from the first spray hole 221 and the second spray hole 231. At this time, the concentrated liquid is sprayed in a positive spiral shape towards the atomizer 300 rotating in the opposite direction around the axis of the gun body 100 to achieve atomization, and enters the waste incinerator to participate in incineration and be completely consumed, achieving "zero emission" of the concentrated liquid. More importantly, it can reduce the amount of nitrogen oxides generated in the flue gas during waste incineration from the source, and ultimately reduce the concentration of nitrogen oxides at the outlet of the waste incineration waste heat boiler.

[0069] The first blade 241 is disposed on the inner side of the guide plate 240; the outer side of the guide plate 240 is arc-shaped and extends axially along the inlet pipe 110 to be close to the inner circumference of the inlet pipe 110, for scraping off the concentrate adhering to the inner circumference of the inlet pipe 110 and guiding it. Specifically, the end of the guide plate 240 away from the first ring 210 is pointed (thickness gradually decreases), which can reduce the resistance to the flow of the concentrate to facilitate its guidance. At the same time, the guide plate 240 and the first blade 241 work together to scrape off the concentrate adhering to the inner circumference of the inlet pipe 110 and stir it to reduce its sedimentation in the inlet pipe 110, thereby effectively preventing the risk of blockage inside the nozzle 200.

[0070] To enhance the stirring effect and further reduce the sedimentation of the concentrate in the inlet pipe 110, a number of circumferentially distributed stirring rods 250 are connected to the side of the first ring 210 away from the cylindrical tube 220. The stirring rods 250 extend axially along the inlet pipe 110 for a certain length and then bend radially inward toward the inlet pipe 110 to form an L-shaped structure. The L-shaped stirring rods 250 are located behind the first blade 241 (downstream of the concentrate flow direction) and are arranged at intervals with the guide plate 240.

[0071] In this embodiment, six first nozzles 221 and six second nozzles 231 are evenly distributed around the circumference and are staggered by 30° from each other. Three guide plates 240 and three first blades 241 are evenly distributed around the circumference. Three stirring rods 250 are evenly distributed around the circumference.

[0072] To prevent axial movement of the nozzle 200, which rotates in the positive direction around the axis of the gun body 100, the outlet end of the inlet pipe 110 is detachably connected to a pressure sleeve 400 with the same outer diameter as the inlet pipe 110 via an external thread connection (see details). Figure 3 and Figure 6 As shown, the pressure sleeve 400 is provided with a first retaining ring 410. The inner side of the first retaining ring 410 is slidably engaged with the side of the first ring 210 facing the cylindrical cylinder 220, and the outer circumferential wall of the cylindrical cylinder 220 is slidably engaged with the inner circumferential wall of the first retaining ring 410 (high-temperature resistant lubricating oil can be applied to both mating surfaces to reduce sliding friction). By having the first retaining ring 410 abut against the first ring 210 to block the axial movement of the nozzle 200, the stability of the nozzle 200's rotation can be improved, thereby ensuring the atomization effect of the concentrate. At the same time, the outer diameter of the pressure sleeve 400 is equal to the outer diameter of the liquid inlet pipe 110, which can reduce the resistance to the flow of compressed gas in the air inlet pipe 120, thereby ensuring the atomization efficiency (effective utilization rate) of the compressed gas.

[0073] See Figure 3 , Figure 7 and Figure 8As shown, the atomizer 300 includes a second ring 310 and an atomizing cover 320 connected to each other; the second ring 310 is rotatably disposed in an inwardly recessed step at the outlet end of the air inlet pipe 120 (for example, a bearing can be installed at this step, and the inner ring of the bearing is fixedly connected to the second ring 310); the second ring 310 has multiple circumferentially distributed second blades 311 with a twisting direction opposite to that of the first blade 241; the second blades 311 extend radially along the air inlet pipe 120 and are inclined towards the outlet end of the air inlet pipe 120; the atomizing cover 320 is located around the hemispherical end cap 230 to cover the first nozzle 221 and the second nozzle 231, and the area between it and the hemispherical end cap 230 forms a first atomizing channel; the outlet of the first atomizing channel is opened in the middle of the atomizing cover 320 and is coaxial with the hemispherical end cap 230. Compressed gas flowing in the intake pipe 120 impacts the second blade 311 from the front, causing the second blade 311 to deflect. This deflects the second ring 310, which in turn drives the entire atomizer 300 to rotate in the opposite direction around the axis of the gun body 100. The compressed gas flowing through the second blade 311 enters the first atomization channel and is blown in a counter-spiral manner towards the concentrated liquid ejected from the first nozzle 221 and the second nozzle 231, thus atomizing it and allowing it to enter the waste incinerator for combustion through the outlet of the first atomization channel. In other words, the nozzle 200 and the atomizer 300, through their relative forward and reverse rotations, cause the concentrated liquid ejected in a forward spiral to collide and cut with the compressed gas ejected in a counter-spiral manner, which can improve the atomization effect of the concentrated liquid and effectively solve problems such as difficulty in igniting waste, uneven feeding in the incinerator, and uneven combustion.

[0074] The aforementioned concentrated liquid return spray gun for nitrogen reduction in waste incinerators also includes an end cap 500, which is provided with a straight cylindrical section 510 and a conical section 520 in sequence (see details). Figure 3 and Figure 9(As shown); the straight cylinder 510 is detachably connected to the outlet end of the air intake pipe 120 with the same outer diameter as the air intake pipe 120 via an external thread. A second retaining ring 511 is provided on the inner side of the connection between the straight cylinder 510 and the conical cylinder 520. The side of the second retaining ring 511 away from the conical cylinder 520 slides against the side of the second ring 310 facing the atomizing cover 320 (this mating surface can be coated with high-temperature resistant lubricating oil to reduce sliding friction), used to block the atomizer 300 to prevent axial movement when it rotates in the opposite direction around the axis of the gun body 100; the conical cylinder 520 is located around the atomizing cover 320 to... The area between the two forms a second atomizing channel. The outlet of the second atomizing channel is located at the middle of the small end of the cone section 520 and is coaxial with the atomizing hood 320. The inner diameter of the outlet of the second atomizing channel is smaller than the inner diameter of the outlet of the first atomizing channel to form a confluence area between the two. The atomizing hood 320 is fixedly connected to the second ring 310 by multiple circumferentially distributed connecting rods 330. On the side of the atomizing hood 320 facing the second ring 310, there are multiple circumferentially distributed and inclined diverter plates 321. The diverter plates 321 and the connecting rods 330 are arranged at intervals and correspond one-to-one with the second blades 311 for compressing the gas flow. The compressed gas flowing through the second blade 311 is split into two parts by the flow divider 321, entering the first atomizing channel and the second atomizing channel respectively. One part of the airflow entering the first atomizing channel atomizes the concentrated liquid ejected from the first nozzle 221 and the second nozzle 231, and then meets the other part of the airflow entering the second atomizing channel at the confluence zone, resulting in further atomization. The atomized liquid then enters the waste incinerator through the outlet of the second atomizing channel for combustion. In other words, the first atomizing channel between the atomizing hood 320 and the hemispherical head 230, and the confluence zone between the outlets of the first and second atomizing channels, prolong the contact time between the concentrated liquid and the compressed gas, thereby effectively improving the atomization effect of the concentrated liquid.

[0075] In order to effectively utilize another part of the airflow entering the second atomizing channel to further improve the atomization effect of the concentrate, the atomizing cover 320 is provided with a plurality of circumferentially distributed first through holes 322 and second through holes 323. The first through holes 322 and second through holes 323 correspond one-to-one with the first spray hole 221 and the second spray hole 231, respectively, and the diameter of the first two holes is larger than that of the latter two holes. When the atomizer 300 rotates in the opposite direction around the axis of the gun body 100 under the pneumatic force of compressed gas until the first through hole 322 aligns with the first nozzle 221 and the second through hole 323 aligns with the second nozzle 231, the concentrated liquid sprayed from the first nozzle 221 and the second nozzle 231 is partially atomized into fine droplets by the airflow in the first atomizing channel. It then enters the second atomizing channel through the first through hole 322 and the second through hole 323, where it is atomized again into even smaller droplets by another portion of the airflow. These droplets then merge with the fine droplets at the outlet of the first atomizing channel in the confluence zone, resulting in a third atomization, further reducing the droplet size. Finally, the concentrated liquid enters the waste incinerator through the outlet of the second atomizing channel to participate in incineration. In other words, by passing through the first atomizing channel, the second atomizing channel, and the confluence zone between the outlets of the first and second atomizing channels, the sufficient contact time between the concentrated liquid and the compressed gas can be further extended, resulting in three atomizations, thereby further improving the atomization effect of the concentrated liquid.

[0076] In this embodiment, the second blade 311 and the flow divider 321 are each circumferentially distributed with six pieces, the first through hole 322 and the second through hole 323 are each circumferentially distributed with six pieces, and the connecting rod 330 is circumferentially distributed with six pieces.

[0077] See Figure 1 , Figure 2 and Figure 10 As shown, the gun body 100 is fixedly installed on the furnace body (not shown in the figure) of the waste incinerator via a flange tube 600. Specifically, the flange tube 600 includes a flange 610 and a sleeve 620 connected to the middle of the flange 610. After the gun body 100 (the end with the nozzle 200 and atomizer 300) is inserted into the furnace body, the flange 610 is fixedly connected to the furnace body. The sleeve 620 is fitted onto the air inlet pipe 120 and is located between the inlet end and the outlet end of the air inlet pipe 120.

[0078] To adjust the depth of the gun body 100 inserted into the furnace so that the invention is applicable to different types of waste incinerators, a pair of sliding grooves 621 are provided on the inner circumference of the sleeve 620, and a pair of guide rails 121 are provided on the outer circumference of the air inlet pipe 120 along its axial direction. The guide rails 121 are slidably connected to the sliding grooves 621. A screw 630 is threaded onto the sleeve 620, and the screw 630 is arranged radially along the sleeve 620 for locking the sleeve 620 and the air inlet pipe 120. By loosening the screw 630, the depth of the gun body 100 inserted into the furnace can be adjusted by sliding between the guide rails 121 and the sliding grooves 621.

[0079] Based on the above, the working principle of this invention is as follows:

[0080] During operation, the concentrated liquid enters the inlet pipe 110 from the inlet end and flows towards the outlet end of the inlet pipe 110 under pressure, directly impacting the first blade 241. The hydraulic force causes the first blade 241 to deflect, thus rotating the first ring 210, which in turn drives the entire nozzle 200 to rotate in a positive direction around the axis of the gun body 100. The concentrated liquid flowing through the first blade 241 is stirred by the L-shaped stirring rod 250 and enters the cylindrical cylinder 220 and hemispherical end cap 230, then is ejected from the first spray hole 221 and the second spray hole 231 in a positive spiral shape to the first atomizing channel. Simultaneously, compressed gas enters the air inlet pipe 120 from the inlet end and flows towards the outlet end of the air inlet pipe 120 under pressure, directly impacting the second blade 311. The gas force causes the second blade 311 to deflect, thus rotating the second ring 310, which in turn drives the entire atomizer 300 to rotate. The compressed gas flowing through the second blade 311 rotates in the opposite direction around the axis of the gun body 100. Under the action of the diverter plate 321, the compressed gas is divided into two parts and enters the first atomizing channel and the second atomizing channel respectively. One part of the airflow entering the first atomizing channel will atomize the concentrated liquid sprayed from the first nozzle 221 and the second nozzle 231 into fine droplets for the first time. Then, it will enter the second atomizing channel through the first through hole 322 and the second through hole 323 and be atomized again into even smaller droplets by another part of the airflow in the channel. Then, it will merge with the fine droplets at the outlet of the first atomizing channel in the confluence zone and be atomized for the third time. Its particle size will be further reduced. Finally, it will enter the waste incinerator through the outlet of the second atomizing channel to participate in the incineration and be completely consumed, realizing the "zero emission" of the concentrated liquid. More importantly, it can reduce the amount of nitrogen oxides generated in the flue gas during the waste incineration process from the source, and ultimately reduce the concentration of nitrogen oxides at the outlet of the waste incineration waste heat boiler.

[0081] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A concentrated liquid return spray gun for nitrogen reduction in a waste incinerator, characterized in that, include: The gun body has an inner and outer concentrator inlet pipe for liquid concentrate and an outer gas inlet pipe for compressed gas. A nozzle is movably located at the outlet end of the inlet pipe for spraying out concentrated liquid; and Atomizer, movably mounted at the outlet end of the air inlet pipe and located around the nozzle, is used to atomize concentrated liquid for incineration in the waste incinerator. The nozzle can rotate in the forward direction around the gun body axis under the hydraulic force of the concentrated liquid, and the atomizer can rotate in the reverse direction around the gun body axis under the pneumatic force of the compressed gas. The nozzle comprises a first circular ring, a cylindrical tube, and a hemispherical end cap arranged sequentially. The first ring is rotatably mounted in an inwardly recessed step at the outlet end of the liquid inlet pipe. A plurality of circumferentially distributed guide plates are connected to the side of the first ring away from the cylindrical tube. Each guide plate extends into the interior of the liquid inlet pipe and has a first blade on it. The first blade extends radially along the liquid inlet pipe and is inclined toward the outlet end of the liquid inlet pipe. Multiple circumferentially distributed first spray holes are provided at the connection between the cylindrical tube and the hemispherical head, and the spray direction of the first spray holes is perpendicular to the axis of the liquid inlet pipe. The hemispherical end cap is provided with a plurality of circumferentially distributed second spray holes, and the spray direction of the second spray holes forms a 45° angle with the axial direction of the liquid inlet pipe.

2. The concentrated liquid return spray gun for nitrogen reduction in a waste incinerator according to claim 1, characterized in that: The first blade is disposed on the inner side of the guide plate; The outer side of the guide plate is arc-shaped and extends axially along the inlet pipe to be close to the inner circumference of the inlet pipe, for scraping off the concentrate adhering to the inner circumference of the inlet pipe and guiding it.

3. The concentrated liquid return spray gun for nitrogen reduction in a waste incinerator according to claim 1 or 2, characterized in that: The side of the first ring away from the cylindrical tube is also connected to a plurality of circumferentially distributed stirring rods; The stirring rod extends axially along the liquid inlet pipe for a certain length and then bends radially inward toward the liquid inlet pipe to form an L-shaped structure. The L-shaped stirring rod is located behind the first blade and is spaced apart from the guide plate.

4. The concentrated liquid return spray gun for nitrogen reduction in a waste incinerator according to claim 3, characterized in that: The outlet end of the inlet pipe is detachably connected to a pressure sleeve with the same outer diameter as the inlet pipe; The pressure sleeve is provided with a first retaining ring; The inner side of the first retaining ring slides in contact with the side of the first ring facing the cylindrical tube; The outer circumferential wall of the cylindrical tube slides into the inner circumferential wall of the first retaining ring.

5. The concentrated liquid return spray gun for nitrogen reduction in a waste incinerator according to claim 1 or 4, characterized in that: The atomizer includes a second ring and an atomizing cover connected together; The second ring is rotatably mounted in an inwardly recessed step at the outlet end of the air intake pipe. The second ring has multiple circumferentially distributed second blades with a twisting direction opposite to that of the first blade. The second blades extend radially along the air intake pipe and are inclined toward the outlet end of the air intake pipe. The atomizing hood is located around the hemispherical head to cover the first and second spray holes, and the area between the hood and the hemispherical head forms a first atomizing channel. The outlet of the first atomizing channel is located in the middle of the atomizing hood and is coaxial with the hemispherical head.

6. The concentrated liquid return spray gun for nitrogen reduction in a waste incinerator according to claim 5, characterized in that: It also includes an end cap, which is provided with a straight cylindrical portion and a conical cylindrical portion in sequence; The straight cylindrical part has the same outer diameter as the air inlet pipe and is detachably connected to the outlet end of the air inlet pipe. A second retaining ring is provided on the inner side of the connection between the straight cylindrical part and the conical part. The side of the second retaining ring away from the conical part slides and engages with the side of the second ring facing the atomizing shroud to block the atomizer and prevent it from axially shifting when it rotates in the opposite direction around the gun body axis. The conical section is located around the atomizing hood to form a second atomizing channel in the area between the two. The outlet of the second atomizing channel is opened at the middle of the small end of the conical section and is coaxial with the atomizing hood. The inner diameter of the outlet of the second atomizing channel is smaller than the inner diameter of the outlet of the first atomizing channel to form a confluence area between the two. The atomizing cover is fixedly connected to the second ring by multiple circumferentially distributed connecting rods. The atomizing cover has multiple circumferentially distributed and inclined diverting plates on one side facing the second ring. The diverting plates are arranged at intervals with the connecting rods and correspond one-to-one with the second blades for diverting compressed gas.

7. The concentrated liquid return spray gun for nitrogen reduction in a waste incinerator according to claim 6, characterized in that: The atomizing cover has multiple circumferentially distributed first and second through holes; The first through hole and the second through hole correspond one-to-one with the first spray hole and the second spray hole, respectively, and the diameter of the first two holes is larger than that of the latter two holes.

8. The concentrated liquid return spray gun for nitrogen reduction in a waste incinerator according to any one of claims 1, 2, 4, 6, and 7, characterized in that: The gun body is fixedly installed on the furnace body of the waste incinerator via a flange tube; The flange includes a flange and a sleeve connected to the middle of the flange. After the gun body is inserted into the furnace body, the flange is fixedly connected to the furnace body. The sleeve is sleeved on the air inlet pipe and located between the inlet end and the outlet end of the air inlet pipe.

9. The concentrated liquid return spray gun for nitrogen reduction in a waste incinerator according to claim 8, characterized in that: A pair of sliding grooves are provided on the inner side wall of the sleeve, and a pair of guide rails are provided on the outer side wall of the air intake pipe along its axial direction. The guide rails are slidably connected to the sliding grooves. The sleeve is threaded with a screw, which is arranged radially along the sleeve and is used to lock the sleeve to the air inlet pipe.

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