Denitration spraying system and industrial kiln with same

Abstract

The utility model discloses a denitration spraying system and an industrial kiln with the same, and relates to the technical field of industrial kilns. The denitration spraying system comprises an atomizing device and a spraying device, the atomizing device comprises an ammonia water tank, a carbon dioxide gas source and an atomizer, the spraying device comprises a spraying pipe assembly and a regulating valve assembly, ammonia water needed by denitration reaction is atomized into ammonia mist through an atomizer body and enters an atomizing cavity, and the atomizing cavity is communicated with the atomizing cavity. The atomization cavity is filled with carbon dioxide gas through the carbon dioxide gas source so that a mixture of ammonia mist and the carbon dioxide gas can be formed in the atomization cavity, the mixture can be sprayed into the furnace body through the spraying device so that the ammonia mist in the mixture can make full contact with nitric oxide in the furnace body, the reaction efficiency of the denitration reaction can be improved, and the denitration efficiency is improved. And the carbon dioxide gas in the mixture can control the oxygen content in the furnace body, so that the generation of nitrogen oxides in the furnace body is reduced, the consumption of ammonia water of a denitration spraying system is reduced, and the denitration cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of industrial kiln technology, and more specifically, to a denitrification spray system and an industrial kiln having the denitrification spray system. Background Technology

[0002] In related technologies, ammonia mist is usually sprayed into the flue of industrial kilns using a dual-fluid spray gun to treat nitrogen oxides generated in the kilns. However, the ammonia mist has a large particle size and the spraying position is unreasonable, which leads to problems such as slow denitrification reaction speed, low efficiency, insufficient reaction time and insufficient reaction temperature. It can also cause ammonia mist to escape, increasing the cost of denitrification. Utility Model Content

[0003] This invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, this invention proposes a denitrification spray system that can reduce ammonia consumption and lower denitrification costs.

[0004] This utility model also proposes an industrial kiln with the above-mentioned denitrification spray system.

[0005] A denitrification spray system according to an embodiment of the present invention is used in an industrial kiln. The denitrification spray system includes: an atomizing device, which includes an ammonia tank, a carbon dioxide gas source, and an atomizer. The atomizer has an atomizer body and an atomizing chamber. The atomizer body is used to atomize the ammonia in the ammonia tank into ammonia mist and then introduce it into the atomizing chamber. The carbon dioxide gas source is used to provide carbon dioxide gas to the atomizing chamber so that the atomizing chamber contains a mixture of the ammonia mist and the carbon dioxide gas. The spraying device includes: a spray pipe assembly and a regulating valve assembly. The spray pipe assembly is adapted to connect the atomizing chamber and the kiln body of the industrial kiln. The regulating valve assembly is disposed on the spray pipe assembly and is used to regulate the flow rate of the mixture flowing through the spray pipe assembly.

[0006] According to the denitrification spray system of this utility model embodiment, the ammonia water required for the denitrification reaction is atomized into ammonia mist through the atomizer body and enters the atomization chamber. The carbon dioxide gas source fills the atomization chamber with carbon dioxide gas to form a mixture of ammonia mist and carbon dioxide gas in the atomization chamber. The spray device can spray the mixture into the furnace body so that the ammonia mist in the mixture can fully contact the nitrogen oxides in the furnace body, which can improve the reaction efficiency of the denitrification reaction. The carbon dioxide gas in the mixture can control the oxygen content in the furnace body, thereby reducing the generation of nitrogen oxides in the furnace body, which in turn helps to reduce the consumption of ammonia water in the denitrification spray system and reduce the denitrification cost.

[0007] According to some embodiments of the present invention, the atomizer body has an ultrasonic atomization unit, which is used to atomize the ammonia water into ammonia mist with a particle size of 0.5 μm to 10 μm.

[0008] According to some embodiments of the present invention, the atomizing device further includes: an ammonia water delivery pipe, wherein the ammonia water tank is connected to the atomizer body through the ammonia water delivery pipe; and a drain valve, wherein the drain valve is disposed on the ammonia water delivery pipe and is used to selectively drain the ammonia water in the ammonia water delivery pipe.

[0009] According to some embodiments of the present invention, the spray pipe assembly is adapted to communicate with a preset furnace temperature zone of the furnace body, wherein the furnace temperature corresponding to the preset furnace temperature zone is between 1000°C and 1200°C.

[0010] According to some embodiments of the present invention, the spray pipe assembly includes: a delivery pipe and an adapter, the delivery pipe connecting the atomizing chamber and the adapter; and a plurality of spray pipes, one end of each spray pipe being connected to the adapter, and the other end of each spray pipe being adapted to be connected to the preset furnace temperature zone.

[0011] According to some embodiments of the present invention, each of the spray pipes is adapted to be installed and fixed to the furnace body.

[0012] According to some embodiments of the present invention, the adapter includes: a fixed connector having an adapter cavity that communicates with the conveying pipe; and a rotating connector rotatably connected to the fixed connector about the rotation axis of the furnace body, the rotating connector having multiple adapter interfaces corresponding to the multiple spray pipes, one end of the adapter interface communicating with the adapter cavity, and the other end of the adapter interface communicating with the corresponding spray pipe.

[0013] According to some embodiments of the present invention, the regulating valve assembly includes: a main control valve disposed on the delivery pipe, the main control valve being used to regulate the flow rate of the mixture in the delivery pipe; and a plurality of sub-control valves, each of the plurality of sub-control valves corresponding to a plurality of spray pipes, the sub-control valves being disposed on the corresponding spray pipes, the sub-control valves being used to regulate the flow rate of the mixture in the corresponding spray pipe.

[0014] According to some embodiments of the present invention, the denitrification spray system further includes: a controller, which is communicatively connected to the regulating valve assembly, and the controller is used to control the regulating valve assembly to regulate the flow rate of the mixture flowing through the spray pipe assembly according to the output of the industrial kiln.

[0015] The industrial kiln according to an embodiment of the present invention includes a furnace body and the aforementioned denitrification spray system.

[0016] According to the industrial kiln of this utility model embodiment, the ammonia water required for the denitrification reaction is atomized into ammonia mist through the atomizer body and enters the atomization chamber. The carbon dioxide gas source fills the atomization chamber with carbon dioxide gas to form a mixture of ammonia mist and carbon dioxide gas in the atomization chamber. The spray device can spray the mixture into the furnace body so that the ammonia mist in the mixture can fully contact the nitrogen oxides in the furnace body, which can improve the reaction efficiency of the denitrification reaction. The carbon dioxide gas in the mixture can control the oxygen content in the furnace body, thereby reducing the generation of nitrogen oxides in the furnace body, which in turn helps to reduce the consumption of ammonia water in the denitrification spray system and reduce the denitrification cost.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of an industrial kiln and its denitrification spray system according to an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 Enlarged view of the atomizing device;

[0020] Figure 3 yes Figure 1 Enlarged view of the spray device;

[0021] Figure 4 This is a top view of the flue, furnace body, and spray device according to an embodiment of the present utility model;

[0022] Figure 5 This is a right view of the flue, furnace body, and spray device according to an embodiment of the present utility model;

[0023] Figure 6 This is a cross-sectional view of the adapter according to an embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram of an adapter according to an embodiment of the present utility model.

[0025] Figure label:

[0026] Atomizing device 1; ammonia tank 11; vent 111; elbow 1111; carbon dioxide gas source 12; atomizer 13; atomizer body 131; atomizing chamber 132; ammonia delivery pipe 14; ammonia delivery pump 15; electric pressure gauge 16; check valve 17; drain valve 18;

[0027] Spraying device 2; spray pipe assembly 21; delivery pipe 211; adapter 212; fixed joint 2121; rotating joint 2122; adapter interface 2123; adapter cavity 2124; spray pipe 213; first spray sub-pipe 2131; connecting flange 2132; first elbow pipe 2133; second spray sub-pipe 2134; second elbow pipe 2135; regulating valve assembly 22; main control valve 221; sub-control valve 222;

[0028] 3. Mounting component; 4. Ball valve; 5. Safety valve; 6. Pressure relief valve; 7. Pressure regulating valve; 8. Thermometer; 9. Pressure gauge; 10. Flow meter; 101. Mixture check valve; 102. Flue; 103. Gas injection pipe; 104. Furnace body;

[0029] Denitrification spray system 100; industrial kiln 1000. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 utility model.

[0032] 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 utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 mechanical connection, an electrical connection, or a connection that allows communication between them; 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 utility model according to the specific circumstances.

[0034] The following describes in detail, with reference to the accompanying drawings, a denitrification spray system 100 and an industrial kiln 1000 having the same, according to embodiments of the present invention.

[0035] Reference Figures 1-5 As shown, the denitrification spray system 100 according to an embodiment of the present invention is used in an industrial kiln 1000. The denitrification spray system 100 includes: an atomizing device 1 and a spraying device 2. The atomizing device 1 includes: an ammonia tank 11, a carbon dioxide gas source 12 and an atomizer 13. The atomizer 13 has an atomizer body 131 and an atomizing chamber 132. The atomizer body 131 is used to atomize the ammonia in the ammonia tank 11 into ammonia mist and then pass it into the atomizing chamber 132. The carbon dioxide gas source 12 is used to provide carbon dioxide gas to the atomizing chamber 132 so that the atomizing chamber 132 forms a mixture of ammonia mist and carbon dioxide gas. The spraying device 2 includes: a spray pipe assembly 21 and a regulating valve assembly 22. The spray pipe assembly 21 is adapted to connect the atomizing chamber 132 and the furnace body 104 of the industrial kiln 1000. The regulating valve assembly 22 is disposed on the spray pipe assembly 21 and is used to regulate the flow rate of the mixture flowing through the spray pipe assembly 21.

[0036] The denitrification spray system 100 can be used in an industrial kiln 1000, which can be an industrial cement kiln, limestone calcination kiln, activated carbon production kiln, regeneration kiln, etc. The ammonia tank 11 is used to store ammonia. The ammonia used in the denitrification spray system 100 can be selected with a concentration of 20%, which is beneficial for the denitrification reaction. Ammonia can flow from the ammonia tank 11 into the atomizer 13, where it is atomized into ammonia mist, which then flows into the atomization chamber 132.

[0037] The denitrification spray system 100 can implement SNCR (selective non-catalytic reduction) technology to reduce the pollution of flue gas generated by the industrial kiln 1000. In other words, the denitrification spray system 100 sprays a mixture containing ammonia mist into the furnace body 104 of the industrial kiln 1000, so that the ammonia mist reacts with the nitrogen oxides in the furnace body 104 at a certain temperature to generate pollution-free nitrogen gas, thereby reducing the nitrogen oxides emitted into the atmosphere by the industrial kiln 1000 and thus reducing the pollution of flue gas generated by the industrial kiln 1000.

[0038] The atomizer 13 can atomize ammonia water into ammonia mist with a smaller particle size, which can increase the contact area of ​​ammonia mist. This allows the ammonia mist to have a larger contact area with nitrogen oxides in the denitrification reaction, resulting in a higher proportion of ammonia mist participating in the reaction. This can accelerate the reaction efficiency of the denitrification reaction and reduce ammonia mist escape.

[0039] The atomizing device 1 can be installed outside the furnace body 104. The atomizing device 1 can deliver ammonia mist to the furnace body 104 of the industrial kiln 1000 via the spray pipe assembly 21 of the spray device 2. The volume and installation position of the atomizing device 1 can be reasonably set according to actual usage. As some embodiments of this application, the atomizer 13 of the atomizing device 1 can be an ultrasonic atomizer, which can more effectively reduce the particle size of the ammonia mist. Furthermore, the atomizing device 1 is connected to the furnace body 104 via the spray pipe assembly 21 of the spray device 2. The atomizing device 1 can be installed outside the furnace body 104, and its volume and installation position are not limited. Different types of atomizing devices 1 can be reasonably selected according to actual conditions to achieve the desired atomization effect.

[0040] The carbon dioxide source 12 can be a carbon dioxide cylinder that stores carbon dioxide, and the carbon dioxide cylinder has a certain pressure so that carbon dioxide can be filled into the atomizing chamber 132. Alternatively, the carbon dioxide source 12 can be a device that generates carbon dioxide gas with a certain pressure through a chemical reaction so that the carbon dioxide gas with a certain pressure can be filled into the atomizing chamber 132 to form a mixture of carbon dioxide and ammonia mist in the atomizing chamber 132. This can increase the pressure of the mixture, increase the speed at which the mixture is sprayed onto the furnace body 104, increase the effective collision between the ammonia mist and nitrogen oxides in the furnace body 104, and further increase the reaction rate.

[0041] Meanwhile, compared to using compressed air to atomize ammonia water, this embodiment of the invention reduces the amount of air introduced into the furnace body 104 by spraying a mixture of ammonia mist and carbon dioxide gas into the furnace body 104, thereby reducing the oxygen content in the furnace body 104 and controlling the oxygen content in the furnace body 104. The lower oxygen content in the furnace body 104 can reduce the generation of nitrogen oxides, thus achieving the effect of reducing the generation of nitrogen oxides in the furnace body 104.

[0042] The mixture first flows from the atomizing chamber 132 of the atomizer 13 into the spray pipe assembly 21. The regulating valve assembly 22 is used to control the flow rate of the mixture through the spray pipe assembly 21 so that the flow rate of the mixture can match the production of nitrogen oxides in the furnace body 104, thereby improving the utilization rate of ammonia mist, making the ammonia mist more fully utilized, and reducing ammonia mist escape.

[0043] The spray device 2 can spray the mixture into the furnace body 104. The furnace body 104 has a preset furnace temperature zone and an optimal reaction temperature zone. The temperature of the optimal reaction temperature zone is the optimal reaction temperature for the denitrification reaction. The temperature of the preset furnace temperature zone is higher than that of the optimal reaction temperature zone. The mixture can be sprayed into the preset furnace temperature zone inside the furnace body 104. When the mixture reacts with nitrogen oxides in the furnace body 104, the mixture and nitrogen oxides can pass through the optimal reaction temperature zone. The mixture and nitrogen oxides can undergo denitrification reaction in both the furnace body 104 and the flue 102. The long flow path of the mixture and nitrogen oxides can prolong the reaction time of the denitrification reaction, making the denitrification reaction more complete. This results in a lower nitrogen oxide content in the discharged flue gas. At the same time, it can make fuller use of ammonia mist, improve the utilization rate of ammonia mist, reduce ammonia escape, and save denitrification costs.

[0044] In the above embodiment, the ammonia water required for the denitrification reaction is atomized into ammonia mist through the atomizer body 131 and enters the atomization chamber 132. The carbon dioxide gas source 12 fills the atomization chamber 132 with carbon dioxide gas to form a mixture of ammonia mist and carbon dioxide gas in the atomization chamber 132. The spray device 2 can spray the mixture into the furnace body 104 so that the ammonia mist in the mixture can fully contact the nitrogen oxides in the furnace body 104, which can improve the reaction efficiency of the denitrification reaction. The carbon dioxide gas in the mixture can control the oxygen content in the furnace body 104, thereby reducing the generation of nitrogen oxides in the furnace body 104, which in turn helps to reduce the consumption of ammonia water in the denitrification spray system 100 and reduce the denitrification cost.

[0045] In some embodiments of this utility model, the atomizer body 131 has an ultrasonic atomization unit, which is used to atomize ammonia water into ammonia mist with a particle size of 0.5 μm to 10 μm.

[0046] The ultrasonic atomization unit atomizes ammonia water into ammonia mist. The ammonia mist particle size can be, but is not limited to, 0.5µm, 2µm, 5µm, and 10µm. Reducing the ammonia mist particle size allows for a larger contact area between the ammonia mist and nitrogen oxides during the denitrification reaction, resulting in a higher proportion of ammonia mist participating in the reaction and accelerating the denitrification reaction efficiency while reducing ammonia mist escape. Simultaneously, atomizing ammonia water into ammonia mist also increases the ammonia mist pressure, allowing the ammonia mist sprayed onto the furnace body 104 to have a higher flow velocity, increasing the effective collision between the ammonia mist and nitrogen oxides and thus improving reaction efficiency.

[0047] In some embodiments of this utility model, such as Figure 2 As shown, the atomizing device 1 also includes an ammonia water delivery pipe 14 and a drain valve 18. The ammonia water tank 11 is connected to the atomizer body 131 through the ammonia water delivery pipe 14. The drain valve 18 is located on the ammonia water delivery pipe 14 and is used to selectively discharge the ammonia water in the ammonia water delivery pipe 14.

[0048] The drain valve 18 can discharge ammonia water from the ammonia water delivery pipe 14 through its drain port. When the atomizing device 1 is working, the drain port of the drain valve 18 is closed, and the ammonia water delivery pipe 14 can deliver ammonia water to the atomizer. When the atomizing device 1 stops working, the drain port of the drain valve 18 is opened so that the ammonia water in the ammonia water delivery pipe 14 can be discharged through the drain port of the drain valve 18 to avoid residual ammonia water damaging the ammonia water delivery pipe 14.

[0049] As some embodiments of this application, the drain valve 18 can be configured as a three-way valve, which has an inlet, an outlet, a drain port, and a valve core. The valve core can control the opening and closing of the drain port. When the atomizing device 1 is working, the valve core controls the drain port to close. When the atomizing device 1 stops working, the valve core controls the drain port to open, and the residual ammonia in the ammonia delivery pipe 14 flows out of the ammonia delivery pipe 14 through the drain port.

[0050] As some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the ammonia tank 11 may include a vent 111, which can be used to regulate the air pressure inside the ammonia tank 11. As the ammonia in the ammonia tank 11 gradually flows into the atomizer 13, the amount of ammonia in the ammonia tank 11 gradually decreases, and the air pressure inside the ammonia tank 11 gradually decreases. At this time, outside air can enter the ammonia tank 11 through the vent 111 to regulate the air pressure inside the ammonia tank 11, thereby avoiding the risk of deformation of the ammonia tank 11 due to atmospheric pressure caused by the decrease in air pressure inside the ammonia tank 11, and improving the reliability of the ammonia tank 11 in use. The atomizing device 1 may also have an on-site VOC treatment device to treat the ammonia gas overflowing from the vent 111, so as to prevent the overflowing ammonia gas from polluting the air.

[0051] As some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the vent 111 can have an elbow 1111, which is a bent pipe with the opening facing downward. This design can reduce the risk of external impurities entering the ammonia tank 11 through the vent 111, reduce the risk of ammonia in the ammonia tank 11 being contaminated, and at the same time avoid the risk of external impurities entering the ammonia tank 11 and blocking the pipeline.

[0052] As some embodiments of this utility model, a filter device may be provided inside the vent 111. The filter device can be used to filter impurities to further reduce the risk of external impurities entering the ammonia tank 11 through the vent 111, thereby further improving the reliability of the ammonia tank 11.

[0053] As some embodiments of this utility model, the denitrification spray system 100 may have an escape gas treatment device, which includes an air intake hood, an air pump, pipelines and an ammonia processor. The air intake hood may be installed above the atomizing device 1, and the air pump may be used to draw air to guide the ammonia gas overflowing from the atomizing device 1 to the air intake hood and flow into the ammonia processor through the pipeline. The ammonia gas overflowing from the atomizing device 1 is finally treated in the ammonia processor to reduce the risk of the overflowing ammonia gas polluting the air.

[0054] In some embodiments of this utility model, such as Figure 1 As shown, along the conveying direction of ammonia water on the ammonia water conveying pipe 14, an ammonia water conveying pump 15, an electric pressure gauge 16, a check valve 17, and a drain valve 18 can be sequentially installed on the ammonia water conveying pipe 14.

[0055] The ammonia delivery pump 15 pumps ammonia from the ammonia tank 11 into the ammonia delivery pipe 14. The electric pressure gauge 16 measures the pressure of the ammonia in the ammonia delivery pipe 14. The check valve 17 prevents ammonia mist from flowing back into the electric pressure gauge 16 and damaging it.

[0056] In some embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the spray pipe assembly 21 is adapted to communicate with the preset furnace temperature zone of the furnace body 104, and the furnace temperature corresponding to the preset furnace temperature zone is between 1000°C and 1200°C.

[0057] The industrial kiln 1000 includes a kiln body 104, a gas injection pipe 103, and a flue 102. The gas injection pipe 103 can be installed on one side of the kiln body 104, and can inject combustible gas and combustion-supporting gas (such as coal gas and air) into the kiln body 104. The flue 102 is connected to the side of the kiln body 104 away from the gas injection pipe 103, and can be used to feed materials into the kiln body 104 and discharge flue gas from the kiln body 104. The flue 102 is positioned such that the flue gas flows in the kiln body 104 in the following directions (e.g., [missing information]). Figure 1 As shown in direction A, the temperature inside the furnace body 104 gradually decreases. In the portion of the furnace body 104 where the internal temperature is between 1000℃ and 1200℃, the spray pipe assembly 21 is connected to the furnace body 104. That is, the ambient temperature at the location where the spray pipe assembly 21 connects to the furnace body 104 is between 1000℃ and 1200℃. The ambient temperature at the location where the spray pipe assembly 21 connects to the furnace body 104 can be, but is not limited to, 1000℃, 1100℃, 1200℃, etc.

[0058] As a specific embodiment of this application, the spray pipe assembly 21 can be positioned in the region where the furnace temperature is 1100°C. The ammonia mist and flue gas begin to react in the 1100°C region, and a higher reaction rate is reached in the 950°C region. In addition, the denitrification reaction occurs not only in the furnace body 104 but also in the flue 102 (where the temperature is approximately 800°C to 850°C), increasing the overall reaction time, which can improve the denitrification efficiency and reduce ammonia mist escape.

[0059] The mixture enters the furnace body 104 from the spray pipe assembly 21 and undergoes a denitrification reaction with the nitrogen oxides inside the furnace body 104. The mixture and nitrogen oxides move towards the flue 102, and as they move, the ambient temperature of the mixture and nitrogen oxides gradually decreases. From the preset furnace temperature zone to the outlet of the flue 102, both ammonia mist and nitrogen oxides can react. The reaction process is relatively long, which can improve the efficiency of the denitrification reaction and reduce ammonia mist escape.

[0060] In some embodiments of this utility model, such as Figures 3-5 As shown, the spray pipe assembly 21 includes: a delivery pipe 211, an adapter 212, and a plurality of spray pipes 213. The delivery pipe 211 connects the atomizing chamber 132 and the adapter 212. One end of each spray pipe 213 is connected to the adapter 212, and the other end of each spray pipe 213 is adapted to connect to a preset furnace temperature zone.

[0061] The delivery pipe 211 connects the atomizing chamber 132 and the adapter 212, which can be connected to multiple spray pipes 213. One end of the spray pipe 213 is connected to the adapter 212, and the other end is connected to a preset furnace temperature zone. The mixture enters the adapter 212 from the atomizing chamber 132 via the delivery pipe 211. The mixture in the adapter 212 can then enter the multiple spray pipes 213 and finally be sprayed onto the preset furnace temperature zone of the furnace body 104.

[0062] The number of spray pipes 213 can be, but is not limited to, 2, 4, 6, 8, etc. Multiple spray pipes 213 can spray the mixture conveyed by the atomizing chamber 132 and the adapter 212 into the preset furnace temperature zone of the furnace body 104. Along the outer periphery of the furnace body 104, multiple spray pipes 213 can be distributed at different positions on the outer periphery of the furnace body 104. The distance between any two adjacent spray pipes 213 can be set to be equal, so that the multiple spray pipes 213 can be evenly distributed on the outer periphery of the furnace body 104. This allows the mixture sprayed into the preset furnace temperature zone of the furnace body 104 by the multiple spray pipes 213 to be more evenly distributed within the furnace body 104, enabling the ammonia mist to react more fully with nitrogen oxides, thereby more effectively eliminating nitrogen oxides in the furnace body 104, improving the utilization rate of ammonia mist, and reducing ammonia mist escape.

[0063] As some embodiments of this application, such as Figure 3 and Figure 4 As shown, the spray pipe 213 may include a first spray sub-pipe 2131, a connecting flange 2132, a first elbow pipe 2133, a second spray sub-pipe 2134, and a second elbow pipe 2135. Along the direction of the mixture's movement within the spray pipe 213, the first spray sub-pipe 2131, connecting flange 2132, first elbow pipe 2133, second spray sub-pipe 2134, and second elbow pipe 2135 are sequentially connected. The first spray sub-pipe 2131 and the first elbow pipe 2133 are fixedly connected by the connecting flange 2132, which facilitates the disassembly of the first elbow pipe 2133 for maintenance and other operations. The first elbow pipe 2133 is used to change the direction in which the spray pipe 213 conveys the mixture. The second spray sub-pipe 2134 and the second elbow pipe 2135 are located inside the furnace body 104, and the second elbow pipe 2135 can control the spray direction of the mixture.

[0064] In some embodiments of this utility model, such as Figure 1 , Figures 3-5 As shown, each spray pipe 213 is suitable for installation and fixation to the furnace body 104.

[0065] The denitrification spray system 100 also includes mounting components 3. Each spray pipe 213 is fixed to the furnace body 104 via the mounting components 3, and the mounting components 3 ensure that each spray pipe 213 is thermally connected to the furnace body 104. The furnace body 104 has a certain temperature, which can raise the temperature of the spray pipes 213, thereby further atomizing the ammonia mist within the spray pipes 213 to reduce the particle size of the ammonia mist and increase the pressure of the mixture. This results in a greater velocity of the mixture sprayed through the spray pipes 213, allowing the mixture to have a larger coverage area within the furnace body 104, and thus enabling the ammonia mist to react more fully with nitrogen oxides.

[0066] In some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, the adapter 212 includes a fixed connector 2121 and a rotating connector 2122. The fixed connector 2121 has a connecting cavity 2124, which is connected to the conveying pipe 211. The rotating connector 2122 is rotatably connected to the fixed connector 2121 around the rotation axis of the furnace body 104. The rotating connector 2122 has multiple adapters 2123 that correspond one-to-one with multiple spray pipes 213. One end of the adapter 2123 is connected to the connecting cavity 2124, and the other end of the adapter 2123 is connected to the corresponding spray pipe 213.

[0067] The fixed joint 2121 is fixedly connected to the conveying pipe 211. The mixture enters the transfer chamber 2124 of the fixed joint 2121 through the conveying pipe 211. The furnace body 104 rotates around the rotation axis of the fixed joint 2121. The gas injection pipe 103 passes through the fixed joint 2121 and is fixedly connected to it. The gas injection pipe 103 is used to inject gas into the furnace body 104. The mixture in the transfer chamber 2124 can flow into multiple transfer ports 2123. Each transfer port 2123 corresponds to a spray pipe 213. The mixture enters the spray pipe 213 through the transfer port 2123.

[0068] The rotary joint 2122 can rotate relative to the fixed joint 2121. The rotation axis of the rotary joint 2122 can be the same as the rotation axis of the fixed joint 2121. The rotary joint 2122 is fixedly connected to the spray pipe 213. The spray pipe 213 is fixed to the outside of the furnace body 104. The rotary joint 2122, the spray pipe 213 and the furnace body 104 rotate synchronously.

[0069] In the above embodiment, by setting a fixed joint 2121 and a rotating joint 2122 for rotational connection, the mixture can be sprayed sequentially through the conveying pipe 211, the transfer chamber 2124, multiple adapters 2123 and multiple spray pipes 213 corresponding to the multiple adapters 2123 into the preset furnace temperature zone of the furnace body 104. The rotating joint 2122, the spray pipes 213 and the furnace body 104 can rotate relative to the gas injection pipe 103 and the fixed joint 2121, avoiding interference between the rotation of the furnace body 104 and other parts, while achieving the effect of conveying the mixture to the furnace body 104.

[0070] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the regulating valve assembly 22 includes a main control valve 221 and multiple sub-control valves 222. The main control valve 221 is located on the delivery pipe 211 and is used to regulate the flow rate of the mixture in the delivery pipe 211. The multiple sub-control valves 222 correspond one-to-one with multiple spray pipes 213 and are located on the corresponding spray pipes 213. The sub-control valves 222 are used to regulate the flow rate of the mixture in the corresponding spray pipes 213.

[0071] The main control valve 221 is located on the conveying pipe 211. The main control valve 221 can be set with different opening degrees. The main control valve 221 can control the flow rate of the mixture passing through the conveying pipe 211 by controlling the opening degree.

[0072] Each spray pipe 213 is equipped with a corresponding sub-control valve 222. The sub-control valve 222 can be set with different opening degrees. The sub-control valve 222 can control the opening degree to control the flow rate of the mixture through the corresponding spray pipe 213.

[0073] As some embodiments of this application, the sub-control valve 222 integrates a flow meter, which can detect the flow rate of the mixture flowing through the sub-control valve 222. Both the flow meter and the sub-control valve 222 can be wirelessly connected to the control system of the denitrification spray system 100. The flow meter can transmit the signal of the flow rate of the mixture flowing through the sub-control valve 222 to the control system. After receiving the signal, the control system can send a control signal to the sub-control valve 222 to control the opening degree of the sub-control valve 222, thereby controlling the flow rate of the mixture flowing through the sub-control valve 222.

[0074] In the above embodiments, the regulating valve assembly 22 can regulate the flow rate of the mixture of the delivery pipe 211 and the multiple spray pipes 213 so that the flow rate of the mixture can correspond to the production of nitrogen oxides in the furnace body 104, so that the ammonia mist can react more fully with the nitrogen oxides, thereby improving the utilization rate of ammonia mist and reducing ammonia mist escape.

[0075] In some embodiments of this utility model, the denitrification spray system 100 further includes a controller, which is communicatively connected to the regulating valve assembly 22. The controller is used to control the regulating valve assembly 22 to regulate the flow rate of the mixture flowing through the spray pipe assembly 21 according to the output of the furnace body 104.

[0076] The control system can determine the flow rate of the mixture by combining an intelligent big data analysis system and a real-time precision monitoring system. The intelligent big data analysis system can collect the production of nitrogen oxides under different outputs and loads in the furnace and record the flow rate of the mixture in real time. When encountering the same operating conditions later, the nitrogen oxide production value monitored by the precision monitoring system is intelligently analyzed with the intelligent big data analysis system to determine the precise flow rate of the mixture, so that the ammonia mist can react more fully with the nitrogen oxides, ultimately enabling the flue gas to meet emission standards.

[0077] like Figure 1 and Figure 2 As shown, along the direction of carbon dioxide movement, a ball valve 4, a safety valve 5, a pressure relief valve 6, a pressure regulating valve 7, a thermometer 8, a pressure gauge 9, a flow meter 10, and a mixture check valve 101 are sequentially installed on the gas supply pipeline between the carbon dioxide gas source 12 and the atomizer 13.

[0078] Ball valve 4 can be used as a valve switch for the ammonia water delivery pipe 14. When ball valve 4 is open, carbon dioxide gas source 12 supplies carbon dioxide gas to atomizing chamber 132. Safety valve 5 ensures that the pressure in the gas delivery pipeline remains at a safe level. When the pressure in the gas delivery pipeline exceeds a preset value, safety valve 5 can automatically open to reduce the pressure in the gas delivery pipeline, ensuring the safety of the gas delivery pipeline and preventing damage from excessive pressure. Pressure relief valve 6, when open, can discharge carbon dioxide from the gas delivery pipeline and carbon dioxide gas source 12. Pressure relief valve 6 can be a controlled solenoid valve or a manually operated valve. Pressure regulating valve 7 is used to regulate the pressure value in the gas delivery pipeline. Pressure regulating valve 7 can be adjusted to different valve openings according to actual production needs to keep the pressure of carbon dioxide gas passing through pressure regulating valve 7 within a reasonable range. Thermometer 8 can be used to measure the temperature of carbon dioxide gas in the gas delivery pipeline. Pressure gauge 9 is used to measure the pressure in the gas delivery pipeline. Flow meter 10 can be used to measure the flow rate of carbon dioxide gas in the gas delivery pipeline. Mixture check valve 101 can prevent the mixture in atomizing chamber 132 from flowing back into the gas delivery pipeline.

[0079] The industrial kiln 1000 according to an embodiment of the present invention includes a kiln body 104 and the aforementioned denitrification spray system 100.

[0080] The ammonia water required for the denitrification reaction is atomized into ammonia mist through the atomizer body 131 and enters the atomization chamber 132. The carbon dioxide gas source 12 fills the atomization chamber 132 with carbon dioxide gas to form a mixture of ammonia mist and carbon dioxide gas in the atomization chamber 132. The spray device 2 can spray the mixture into the furnace body 104 so that the ammonia mist in the mixture can fully contact the nitrogen oxides in the furnace body 104, which can improve the reaction efficiency of the denitrification reaction. The carbon dioxide gas in the mixture can control the oxygen content in the furnace body 104, thereby reducing the generation of nitrogen oxides in the furnace body 104, which in turn helps to reduce the consumption of ammonia water in the denitrification spray system 100 and reduce the cost of denitrification.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0082] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A denitration spray system for an industrial furnace, characterized by, The denitration spray system comprises: An atomizing device (1) comprising: an ammonia water tank (11), a carbon dioxide gas source (12), and an atomizer (13) having an atomizer body (131) for atomizing ammonia water in the ammonia water tank (11) into ammonia mist and passing into an atomizing cavity (132), and the carbon dioxide gas source (12) for providing carbon dioxide gas to the atomizing cavity (132) to form a mixture of the ammonia mist and the carbon dioxide gas in the atomizing cavity (132); A spray device (2) comprising: a spray pipe assembly (21) adapted to communicate the atomizing cavity (132) and a shaft (104) of the industrial kiln (1000), and an adjusting valve assembly (22) provided in the spray pipe assembly (21) for adjusting the flow of the mixture through the spray pipe assembly (21).

2. The denitration spray system according to claim 1, characterized by, The atomizer body (131) has an ultrasonic atomizing unit for atomizing the ammonia water into the ammonia mist with a particle size of 0.5-10 um.

3. The denitration spray system according to claim 1, wherein The atomizing device (1) further comprises: An ammonia water conveying pipe (14) communicating the ammonia water tank (11) and the atomizer body (131); A drain valve (18) provided in the ammonia water conveying pipe (14) for selectively draining the ammonia water in the ammonia water conveying pipe (14).

4. The denitration spray system according to any one of claims 1 to 3, characterized in that, The spray pipe assembly (21) is adapted to communicate with a preset in-furnace temperature zone of the shaft (104), and the in-furnace temperature of the preset in-furnace temperature zone is between 1000-1200 ℃.

5. The denitration spray system according to claim 4, wherein The spray pipe assembly (21) comprises: A conveying pipe (211) communicating the atomizing cavity (132) and an adapter (212); A plurality of spray pipes (213), each of which has one end communicating with the adapter (212) and the other end adapted to communicate with the preset in-furnace temperature zone.

6. The denitration spray system according to claim 5, wherein Each of the spray pipes (213) is adapted to be fixedly installed on the shaft (104).

7. The denitration spray system according to claim 6, wherein The adapter (212) comprises: A fixed adapter (2121) having an adapter cavity (2124) communicating with the conveying pipe (211); A rotary joint (2122) is rotatably connected with the fixed joint (2121) around the rotary axis of the furnace body (104), and the rotary joint (2122) has a plurality of rotary interfaces (2123) corresponding to the plurality of spray pipes (213), one end of the rotary interface (2123) is in communication with the rotary interface cavity (2124), and the other end of the rotary interface (2123) is in communication with the corresponding spray pipe (213).

8. The denitration spray system according to claim 5, wherein The adjusting valve assembly (22) comprises: A master valve (221) is arranged in the conveying pipe (211), and the master valve (221) is used to adjust the flow of the mixture in the conveying pipe (211); A plurality of sub-control valves (222) correspond to a plurality of spray pipes (213), and the sub-control valve (222) is arranged in the corresponding spray pipe (213), and the sub-control valve (222) is used to adjust the flow of the mixture in the corresponding spray pipe (213).

9. The denitration spray system according to claim 1, wherein The denitration spraying system further comprises a controller, which is in communication connection with the adjusting valve assembly (22), and the controller is used to control the adjusting valve assembly (22) to adjust the flow of the mixture flowing through the spray pipe assembly (21) according to the output of the industrial kiln (1000).

10. An industrial furnace characterized by, The denitration spraying system comprises a furnace body (104) and the denitration spraying system according to any one of claims 1-9.

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