Denitration spraying system and industrial kiln with same

Abstract

The invention 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] The present invention relates to the technical field of industrial kilns, and more particularly, to a denitration spray system and an industrial kiln having the same denitration spray system. Background Art

[0002] In related technologies, for treating nitrogen oxides generated in industrial kilns, a two-fluid spray gun is usually used to spray ammonia mist into the flue of the industrial kiln. The particle size of the ammonia mist is too large, and the spraying position of the ammonia mist is unreasonable, resulting in problems such as slow denitration reaction speed, low efficiency, insufficient reaction time, and insufficient reaction temperature. It will also cause ammonia mist escape, increasing the denitration cost. Summary of the Invention

[0003] The present invention aims to at least partly solve one of the above technical problems in the prior art. For this purpose, the present invention provides a denitration spray system, which can reduce the consumption of ammonia water and lower the denitration cost.

[0004] The present invention also provides an industrial kiln having the above denitration spray system.

[0005] According to an embodiment of the present invention, a denitration spray system for an industrial kiln includes: an atomizing device, which includes: an ammonia water 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 water in the ammonia water tank into ammonia mist and then introduce it into the atomizing chamber. The carbon dioxide gas source is used to supply carbon dioxide gas to the atomizing chamber, so that a mixture of the ammonia mist and the carbon dioxide gas is formed in the atomizing chamber; a spraying device, which includes: a spray pipe assembly and a regulating valve assembly. The spray pipe assembly is adapted to communicate the atomizing chamber with the furnace body of the industrial kiln. The regulating valve assembly is provided on the spray pipe assembly, and the regulating valve assembly is used to regulate the flow rate of the mixture flowing through the spray pipe assembly.

[0006] According to the denitration spray system of the embodiment of the present invention, the ammonia water required for the denitration reaction is atomized into ammonia mist by the atomizer body and enters the atomizing chamber. The carbon dioxide gas source fills carbon dioxide gas into the atomizing chamber to form a mixture of ammonia mist and carbon dioxide gas in the atomizing chamber. The spraying device can spray the mixture into the interior of 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 denitration 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, and further facilitating the reduction of the consumption of ammonia water by the denitration spray system and lowering the denitration cost.

[0007] According to some embodiments of the present invention, the atomizer body has an ultrasonic atomization unit for atomizing the ammonia water into ammonia mist with a particle size between 0.5 um and 10 um.

[0008] According to some embodiments of the present invention, the atomization device further includes: an ammonia water delivery pipe through which the ammonia water tank communicates with the atomizer body; a drain valve provided on the ammonia water delivery pipe for selectively discharging 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 in-furnace temperature zone of the furnace body, and the in-furnace temperature corresponding to the preset in-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 connecting the atomization chamber and the adapter; a plurality of spray pipes, one end of each spray pipe communicating with the adapter, and the other end of each spray pipe being adapted to communicate with the preset in-furnace temperature zone.

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

[0012] According to some embodiments of the present invention, the adapter includes: a fixed joint having an adapter cavity communicating with the delivery pipe; a rotating joint rotatably connected to the fixed joint around the rotation axis of the furnace body, the rotating joint having a plurality of adapter ports corresponding to the plurality of spray pipes, one end of the adapter port communicating with the adapter cavity, and the other end of the adapter port communicating with the corresponding spray pipe.

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

[0014] According to some embodiments of the present invention, the denitration spray system further includes: a controller communicatively connected to the regulating valve assembly for controlling the regulating valve assembly to adjust the flow rate of the mixture flowing through the spray pipe assembly according to the output of the industrial kiln.

[0015] An industrial kiln according to an embodiment of the present invention includes a furnace body and the above-mentioned denitration spray system.

[0016] For the industrial furnace according to an embodiment of the present invention, the ammonia water required for the denitration reaction is atomized into ammonia mist by 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 spraying device can spray the mixture into the interior of the furnace body, so that the ammonia mist in the mixture can fully contact with the nitrogen oxides in the furnace body, which can improve the reaction efficiency of the denitration 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, and further facilitating the reduction of the consumption of ammonia water in the denitration spraying system and reducing the denitration cost.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an industrial furnace and its denitration spraying system according to an embodiment of the present invention;

[0019] Figure 2 is Figure 1 an enlarged view at the atomizing device;

[0020] Figure 3 is Figure 1 an enlarged view at the spraying device;

[0021] Figure 4 is a top view of a flue, a furnace body and a spraying device according to an embodiment of the present invention;

[0022] Figure 5 is a right view of a flue, a furnace body and a spraying device according to an embodiment of the present invention;

[0023] Figure 6 is a sectional view of an adapter according to an embodiment of the present invention;

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

[0025] Reference numerals:

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

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

[0028] Mounting member 3; ball valve 4; safety valve 5; pressure relief valve 6; pressure regulating valve 7; thermometer 8; pressure gauge 9; flowmeter 10; mixture check valve 101; flue 102; gas injection pipeline 103; furnace body 104;

[0029] Denitrification spraying system 100; industrial kiln 1000. Specific implementation manner

[0030] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where 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 are intended to explain the present invention and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The denitration spray system 100 according to an embodiment of the present invention and the industrial furnace 1000 having the same will be described in detail below with reference to the accompanying drawings.

[0035] Referring to Figures 1 - 5 As shown, the denitration spray system 100 according to an embodiment of the present invention is used for an industrial furnace 1000. The denitration spray system 100 includes an atomizing device 1 and a spraying device 2. The atomizing device 1 includes an ammonia water 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 configured to atomize the ammonia water in the ammonia water tank 11 into ammonia mist and then introduce it into the atomizing chamber 132. The carbon dioxide gas source 12 is configured to supply carbon dioxide gas to the atomizing chamber 132 so that a mixture of ammonia mist and carbon dioxide gas is formed in the atomizing chamber 132. The spraying device 2 includes a spray pipe assembly 21 and a regulating valve assembly 22. The spray pipe assembly 21 is adapted to communicate with the atomizing chamber 132 and the furnace body 104 of the industrial furnace 1000. The regulating valve assembly 22 is provided on the spray pipe assembly 21, and the regulating valve assembly 22 is configured to regulate the flow rate of the mixture flowing through the spray pipe assembly 21.

[0036] Among them, the denitration spray system 100 can be used for an industrial furnace 1000, and the industrial furnace 1000 can be an industrial cement kiln, a limestone calcination kiln, an activated carbon production and regeneration kiln, etc. The ammonia water tank 11 is used to store ammonia water. The ammonia water used in the denitration spray system 100 can be ammonia water with a concentration of 20%. Ammonia water with a concentration of 20% is beneficial to the denitration reaction. The ammonia water can flow from the ammonia water tank 11 into the atomizer 13, and the ammonia water is atomized into ammonia mist in the atomizer body 131, and the ammonia mist can flow into the atomizing chamber 132.

[0037] The denitration spray system 100 can implement the SNCR technology (selective non-catalytic reduction) to reduce the pollution of the flue gas generated by the industrial furnace 1000. That is to say, the denitration spray system 100 sprays a mixture containing ammonia mist components into the furnace body 104 of the industrial furnace 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, reducing the nitrogen oxides discharged from the industrial furnace 1000 into the atmosphere, so as to reduce the pollution of the flue gas generated by the industrial furnace 1000.

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

[0039] The atomization device 1 can be arranged outside the furnace body 104. The atomization device 1 can transport ammonia mist to the furnace body 104 of the industrial kiln 1000 through the spray pipe assembly 21 of the spraying device 2. The volume and installation position of the atomization device 1 can be reasonably set according to the actual use situation. As some embodiments of the present application, the atomizer 13 of the atomization device 1 can select an ultrasonic atomizer, and the ultrasonic atomizer can more effectively reduce the particle size of the ammonia mist. In addition, the atomization device 1 is communicated with the furnace body 104 through the spray pipe assembly 21 of the spraying device 2. The atomization device 1 can be arranged outside the furnace body 104. The volume and installation position of the atomization device 1 are not limited, and different types of atomization devices 1 can be reasonably selected according to the actual situation to achieve the required atomization effect.

[0040] The carbon dioxide gas source 12 can be a carbon dioxide gas cylinder storing carbon dioxide. The carbon dioxide gas cylinder has a certain pressure so that carbon dioxide can be filled into the atomization chamber 132. Or, the carbon dioxide gas 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 atomization chamber 132, so as to form a mixture of carbon dioxide and ammonia mist in the atomization chamber 132, which can increase the pressure of the mixture, can increase the spraying speed of the mixture onto the furnace body 104, can increase the effective collision between the ammonia mist and the nitrogen oxides in the furnace body 104, and further improve the reaction rate.

[0041] At the same time, compared with atomizing ammonia water by using compressed air, the embodiment of the present invention can reduce the amount of air filled into the furnace body 104 by spraying a mixture of ammonia mist and carbon dioxide gas into the furnace body 104, so as to reduce the content of oxygen in the furnace body 104, so as to achieve the effect of 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, and thus can achieve the effect of reducing the generation of nitrogen oxides in the furnace body 104.

[0042] The mixture first flows from the atomization 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 flowing through the spray pipe assembly 21, so that the flow rate of the mixture can match the production amount of nitrogen oxides in the furnace body 104, so as to improve the utilization rate of the ammonia mist, make the ammonia mist be utilized more fully, and reduce ammonia mist escape.

[0043] The spraying device 2 can spray the mixture into the interior of the furnace body 104, which has a preset in-furnace temperature zone and an optimal reaction temperature zone. The temperature of the optimal reaction temperature zone is the optimal reaction temperature for the denitration reaction. The temperature of the preset in-furnace temperature zone can be made higher than that of the optimal reaction temperature zone. The mixture can be sprayed into the preset in-furnace temperature zone inside the furnace body 104, so that when the mixture reacts with the nitrogen oxides in the furnace body 104, the mixture and the nitrogen oxides can pass through the optimal reaction temperature zone. The mixture and the nitrogen oxides can both undergo denitration reactions in the furnace body 104 and the flue 102. The flow path of the mixture and the nitrogen oxides is long, which can extend the reaction time of the denitration reaction, make the denitration reaction more complete, so that the discharged flue gas can have a lower nitrogen oxide content. At the same time, the ammonia mist can be more fully utilized, the utilization rate of the ammonia mist can be improved, ammonia escape can be reduced, and the denitration cost can be saved.

[0044] In the above embodiment, the ammonia water required for the denitration reaction is atomized into ammonia mist by 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 spraying device 2 can spray the mixture into the interior of 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 denitration 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, and further facilitating the reduction of the consumption of ammonia water in the denitration spraying system 100 and reducing the denitration cost.

[0045] In some embodiments of the present invention, the atomizer body 131 has an ultrasonic atomization unit for atomizing ammonia water into ammonia mist with a particle size ranging from 0.5 μm to 10 μm.

[0046] Among them, the ultrasonic atomization unit can atomize ammonia water into ammonia mist. The particle size of the ammonia mist can be, but is not limited to, 0.5 μm, 2 μm, 5 μm, 10 μm, etc. By reducing the particle size of the ammonia mist, the contact area between the ammonia mist and the nitrogen oxides in the denitration reaction can be made larger, the proportion of the ammonia mist participating in the reaction can be higher, and the reaction efficiency of the denitration reaction can be accelerated to reduce ammonia escape. At the same time, atomizing ammonia water into ammonia mist can also increase the pressure of the ammonia mist, so that the ammonia mist sprayed onto the furnace body 104 has a greater flow rate, which can increase the effective collision between the ammonia mist and the nitrogen oxides to increase the reaction efficiency.

[0047] In some embodiments of the present invention, as Figure 2 shown, the atomization device 1 further 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 provided on the ammonia water delivery pipe 14, and the drain valve 18 is used to selectively discharge the ammonia water in the ammonia water delivery pipe 14.

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

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

[0050] As some embodiments of the present invention, as Figure 1 and Figure 2 shown, the ammonia water tank 11 can include a vent port 111. The vent port 111 can be used to adjust the air pressure in the ammonia water tank 11. During the process that the ammonia water in the ammonia water tank 11 gradually flows into the atomizer 13, the ammonia water in the ammonia water tank 11 gradually decreases, and the air pressure in the ammonia water tank 11 gradually decreases. At this time, the outside air can enter the ammonia water tank 11 through the vent port 111 to adjust the air pressure in the ammonia water tank 11, so as to avoid the risk that the tank body of the ammonia water tank 11 is deformed by the atmospheric pressure due to the decrease of the air pressure in the ammonia water tank 11, and improve the use reliability of the ammonia water tank 11. The atomizing device 1 can also have an on-site VOC treatment device to treat the ammonia gas overflowing from the vent port 111, so as to avoid the overflowing ammonia gas polluting the air.

[0051] As some embodiments of the present invention, as Figure 1 and Figure 2 shown, the vent port 111 can have an elbow 1111. The elbow 1111 is configured as a bent pipe with an opening facing downwards. Such a setting can reduce the risk that external impurities enter the ammonia water tank 11 through the vent port 111, reduce the risk that the ammonia water in the ammonia water tank 11 is polluted, and at the same time can avoid the risk that external impurities enter the ammonia water tank 11 and block the pipeline.

[0052] As some embodiments of the present invention, a filtering device can be arranged in the vent port 111. The filtering device can be used to filter impurities, so as to further reduce the risk that external impurities enter the ammonia water tank 11 through the vent port 111, and further improve the use reliability of the ammonia water tank 11.

[0053] In some embodiments of the present invention, the denitration spray system 100 may be provided with a fugitive gas treatment device, which includes a suction hood, an air pump, a pipeline, and an ammonia processor. The suction hood may cover the atomization device 1. The air pump may be used for pumping air to direct the ammonia gas overflowing from the atomization device 1 to the suction hood and flow into the ammonia processor through the pipeline. The ammonia gas overflowing from the atomization device 1 is finally processed in the ammonia processor to reduce the risk of the overflowing ammonia gas polluting the air.

[0054] In some embodiments of the present invention, as Figure 1 shown, along the conveying direction of the ammonia water in the ammonia water conveying pipe 14, an ammonia water conveying pump 15, an electric contact pressure gauge 16, a check valve 17, and a drain valve 18 may be sequentially arranged on the ammonia water conveying pipe 14.

[0055] The ammonia water conveying pump 15 may pump the ammonia water in the ammonia water tank 11 into the ammonia water conveying pipe 14. The electric contact pressure gauge 16 may measure the pressure of the ammonia water in the ammonia water conveying pipe 14. The check valve 17 may prevent the ammonia mist in the atomizer 13 from flowing back to the electric contact pressure gauge 16 so as to damage the electric contact pressure gauge 16.

[0056] In some embodiments of the present invention, as Figure 3 and Figure 4 shown, the spray pipe assembly 21 is adapted to communicate with a preset in-furnace temperature zone of the furnace body 104, and the in-furnace temperature corresponding to the preset in-furnace temperature zone is between 1000°C and 1200°C.

[0057] Wherein, the industrial furnace 1000 includes a furnace body 104, a gas injection pipeline 103, and a flue 102. The gas injection pipeline 103 may be installed on one side of the furnace body 104. The gas injection pipeline 103 may inject combustible gas and combustion-supporting gas (such as gas and air) into the furnace body 104. The flue 102 communicates with the side of the furnace body 104 away from the gas injection pipeline 103. The flue 102 may be used for feeding materials into the furnace body 104 and discharging the flue gas in the furnace body 104. In the flue gas flow direction in the furnace body 104 (as Figure 1 shown by the A direction in

[0058] As a specific embodiment of the present application, the spray pipe assembly 21 can be arranged in the area where the furnace temperature is 1100°C. The ammonia mist and the flue gas start to react in the area of 1100°C and reach a relatively high reaction rate in the area of 950°C. In addition, the denitration reaction occurs not only in the furnace body 104 but also in the flue 102 (the temperature in the flue 102 is about 800°C to 850°C), which increases the overall reaction time, improves the denitration efficiency, and reduces the ammonia mist escape.

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

[0060] In some embodiments of the present invention, as Figures 3 - 5 shown, the spray pipe assembly 21 includes: a delivery pipe 211, a connector 212, and a plurality of spray pipes 213. The delivery pipe 211 communicates with the atomization chamber 132 and the connector 212, and one end of each spray pipe 213 communicates with the connector 212, and the other end of each spray pipe 213 is adapted to communicate with the preset furnace temperature zone.

[0061] Among them, the delivery pipe 211 is used to communicate the atomization chamber 132 and the connector 212, and the connector 212 can communicate with a plurality of spray pipes 213. One end of the spray pipe 213 communicates with the connector 212, and the other end of the spray pipe 213 communicates with the preset furnace temperature zone. The mixture enters the connector 212 from the atomization chamber 132 through the delivery pipe 211, and the mixture in the connector 212 can enter a plurality of spray pipes 213 and finally be sprayed into the preset furnace temperature zone of the furnace body 104.

[0062] The number of the spray pipes 213 can be, but is not limited to, 2, 4, 6, 8, etc. A plurality of spray pipes 213 can all spray the mixture transported through the atomization chamber 132 and the connector 212 into the preset furnace temperature zone of the furnace body 104. Along the outer peripheral wall of the furnace body 104, a plurality of spray pipes 213 can be distributed at different positions on the outer peripheral wall of the furnace body 104, and the distance between every two adjacent spray pipes 213 can be set to be equal, so that a plurality of spray pipes 213 can be evenly distributed on the outer peripheral wall of the furnace body 104, so that the mixture sprayed into the preset furnace temperature zone of the furnace body 104 by a plurality of spray pipes 213 can be more evenly distributed in the furnace body 104, so that the ammonia mist can react more fully with the nitrogen oxides, thereby more effectively eliminating the nitrogen oxides in the furnace body 104, and can also improve the utilization rate of the ammonia mist and reduce the ammonia mist escape.

[0063] As some embodiments of the present application, such as Figure 3 and Figure 4 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 movement direction of the mixture in the spray pipe 213, the first spray sub-pipe 2131, the connecting flange 2132, the first elbow pipe 2133, the second spray sub-pipe 2134, and the second elbow pipe 2135 are sequentially connected and arranged. The first spray sub-pipe 2131 and the first elbow pipe 2133 are fixedly connected through the connecting flange 2132. The connecting flange 2132 can facilitate the disassembly of the first elbow pipe 2133 for maintenance and other operations. The first elbow pipe 2133 is used to change the direction of the mixture transported by the spray pipe 213. 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 the present invention, such as Figure 1 , Figures 3 - 5 shown, each spray pipe 213 is adapted to be installed and fixed on the furnace body 104.

[0065] Wherein, the denitration spray system 100 further includes a mounting member 3. Each spray pipe 213 is installed and fixed on the furnace body 104 through the mounting member 3, and the mounting member 3 makes each spray pipe 213 conductively connected to the furnace body 104. The furnace body 104 has a certain temperature, and the furnace body 104 can heat up the spray pipe 213, so as to further atomize the ammonia mist in the spray pipe 213, reduce the particle size of the ammonia mist and increase the pressure of the mixture, so that the mixture ejected from the spray pipe 213 has a greater speed, so that the mixture has a greater coverage area in the furnace body 104, and further enables the ammonia mist to react more fully with nitrogen oxides.

[0066] In some embodiments of the present invention, such as Figure 6 and Figure 7 shown, the adapter 212 includes a fixed joint 2121 and a rotating joint 2122. The fixed joint 2121 has an adapter cavity 2124, and the adapter cavity 2124 is communicated with the delivery pipe 211. The rotating joint 2122 is rotatably connected to the fixed joint 2121 around the rotation axis of the furnace body 104. The rotating joint 2122 has a plurality of transfer ports 2123 corresponding to the plurality of spray pipes 213 one by one. One end of the transfer port 2123 is communicated with the adapter cavity 2124, and the other end of the transfer port 2123 is communicated with the corresponding spray pipe 213.

[0067] Among them, the fixed joint 2121 is fixedly connected to the conveying pipe 211. The mixture enters the transfer cavity 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 the fixed joint 2121. The gas injection pipe 103 is used to inject gas into the furnace body 104. The mixture in the transfer cavity 2124 can flow into a plurality of transfer interfaces 2123, and each transfer interface 2123 corresponds to a spray pipe 213. The mixture enters the spray pipe 213 through the transfer interface 2123.

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

[0069] In the above embodiment, by providing the fixed joint 2121 and the rotating joint 2122 that are rotatably connected, the mixture can be sprayed into the preset in-furnace temperature area of the furnace body 104 through the conveying pipe 211, the transfer cavity 2124, a plurality of transfer interfaces 2123 and a plurality of spray pipes 213 corresponding to the plurality of transfer interfaces 2123 one by one. And it can make the rotating joint 2122, the spray pipe 213 and the furnace body 104 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, and at the same time achieving the effect of conveying the mixture to the furnace body 104.

[0070] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, the regulating valve assembly 22 includes: a main control valve 221 and a plurality of sub-control valves 222. The main control valve 221 is arranged on the conveying pipe 211. The main control valve 221 is used to regulate the flow rate of the mixture in the conveying pipe 211. The plurality of sub-control valves 222 correspond to the plurality of spray pipes 213 one by one. The sub-control valve 222 is arranged on the corresponding spray pipe 213. The sub-control valve 222 is used to regulate the flow rate of the mixture in the corresponding spray pipe 213.

[0071] Among them, the main control valve 221 is arranged on the conveying pipe 211. The main control valve 221 can be provided with different opening degrees. The main control valve 221 can control the opening degree to control the flow rate of the mixture passing through the conveying pipe 211.

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

[0073] In some embodiments of the present application, the sub-control valve 222 is integrated with a flow meter. The flow meter 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 communicatively connected to the control system of the denitration spray system 100 wirelessly. 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 embodiment, the regulating valve assembly 22 can adjust the flow rate of the mixture in the delivery pipe 211 and the plurality of spray pipes 213, so that the flow rate of the mixture can correspond to the production amount of nitrogen oxides in the furnace body 104, so that the ammonia mist can react more fully with the nitrogen oxides, which can improve the utilization rate of the ammonia mist and reduce ammonia mist escape.

[0075] In some embodiments of the present invention, the denitration spray system 100 further includes: a controller communicatively connected to the regulating valve assembly 22, and the controller is used to control the regulating valve assembly 22 to adjust the flow rate of the mixture flowing through the spray pipe assembly 21 according to the production amount of the furnace body 104.

[0076] Among them, the control system can determine the flow rate of the mixture by combining an intelligent big data analysis system and a real-time precise monitoring system. The intelligent big data analysis system can collect the production amounts of nitrogen oxides under different production amounts and different loads of the furnace body 104, and record the flow rate of the mixture in real time. When the same working conditions are encountered later, after the nitrogen oxide production amount value monitored by the precise monitoring system is intelligently analyzed by the intelligent big data analysis system, the precise flow rate of the mixture is determined, so that the ammonia mist can react more fully with the nitrogen oxides, and finally the flue gas can meet the emission standards.

[0077] As Figure 1 and Figure 2 shown, on the gas transmission pipeline between the carbon dioxide gas source 12 and the atomizer 13, along the movement direction of carbon dioxide, 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 arranged.

[0078] The ball valve 4 can serve as the valve switch for the ammonia water conveying pipe 14. When the ball valve 4 is opened, the carbon dioxide gas source 12 supplies carbon dioxide gas to the atomization chamber 132. The safety valve 5 can ensure that the pressure in the gas transmission pipeline remains in a safe state. When the pressure in the gas transmission pipeline exceeds the preset value, the safety valve 5 can automatically open to reduce the pressure in the gas transmission pipeline to ensure the safety of the gas transmission pipeline and avoid damage to the gas transmission pipeline due to excessive pressure. When the pressure relief valve 6 is opened, it can discharge the carbon dioxide in the gas transmission pipeline and the carbon dioxide gas source 12. The pressure relief valve 6 can be a controlled solenoid valve or a manually opened and closed valve. The pressure regulating valve 7 is used to adjust the pressure value in the gas transmission pipeline. The pressure regulating valve 7 can be adjusted to different valve openings according to actual production needs so that the pressure of the carbon dioxide gas passing through the pressure regulating valve 7 remains within a reasonable range. The thermometer 8 can be used to measure the temperature of the carbon dioxide gas in the gas transmission pipeline. The pressure gauge 9 is used to measure the pressure in the gas transmission pipeline. The flow meter 10 can be used to measure the flow rate of the carbon dioxide gas in the gas transmission pipeline. The mixture check valve 101 can prevent the mixture in the atomization chamber 132 from flowing back into the gas transmission pipeline.

[0079] The industrial kiln 1000 according to an embodiment of the present invention includes a furnace body 104 and the above-described denitration spray system 100.

[0080] The ammonia water required for the denitration reaction is atomized into ammonia mist by the atomizer body 131 and enters the atomization chamber 132. The carbon dioxide gas source 12 fills carbon dioxide gas into the atomization chamber 132 to form a mixture of ammonia mist and carbon dioxide gas in the atomization chamber 132. The spraying device 2 can spray the mixture into the interior of 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 denitration 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, and further facilitating the reduction of the consumption of ammonia water in the denitration spray system 100 and reducing the denitration cost.

[0081] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0082] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill 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 industrial kilns, characterized in that: The denitration spray system comprises: An atomizing device (1), the atomizing device (1) comprising: an ammonia water tank (11), a carbon dioxide gas source (12) and an atomizer (13), the atomizer (13) comprising an atomizer body (131) and an atomizing chamber (132), the atomizer body (131) being used to atomize the ammonia water in the ammonia water tank (11) into ammonia mist and then pass the atomizing chamber (132), the carbon dioxide gas source (12) being used to provide carbon dioxide gas to the atomizing chamber (132), so that a mixture of the ammonia mist and the carbon dioxide gas is formed in the atomizing chamber (132); A spray device (2), the spray device (2) comprising: a spray pipe assembly (21) and a regulating valve assembly (22), the spray pipe assembly (21) being suitable for connecting the atomizing chamber (132) and the furnace body (104) of the industrial kiln (1000); the regulating valve assembly (22) being arranged on the spray pipe assembly (21), and the regulating valve assembly (22) being used for regulating the flow rate of the mixture flowing through the spray pipe assembly (21).

2. The denitration spray system according to claim 1, characterized in that: The atomizer body (131) has an ultrasonic atomization unit, and the ultrasonic atomization unit is used to atomize the ammonia water into the ammonia mist with a particle size of 0.5um to 10um.

3. The denitration spray system according to claim 1, characterized in that: The atomizing device (1) further comprises: an ammonia water delivery pipe (14), wherein the ammonia water tank (11) is connected to the atomizer body (131) through the ammonia water delivery pipe (14); A drain valve (18), the drain valve (18) being arranged on the ammonia water delivery pipe (14), the drain valve (18) being used for selectively discharging the ammonia water in the ammonia water delivery 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 suitable for being connected to a 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.

5. The denitration spray system according to claim 4, characterized in that: The spray pipe assembly (21) comprises: A delivery pipe (211) and an adapter (212), wherein the delivery pipe (211) is connected to the atomization chamber (132) and the adapter (212); A plurality of spray pipes (213), one end of each of the spray pipes (213) being connected to the adapter (212), and the other end of each of the spray pipes (213) being suitable for being connected to the preset temperature zone in the furnace.

6. The denitration spray system according to claim 5, characterized in that: Each of the spray pipes (213) is suitable for being installed and fixed on the furnace body (104).

7. The denitration spray system according to claim 6, characterized in that: The adapter (212) comprises: A fixed joint (2121), wherein the fixed joint (2121) has a transfer cavity (2124), and the transfer cavity (2124) is in communication with the delivery pipe (211); A rotating joint (2122), the rotating joint (2122) is rotatably connected to the fixed joint (2121) around the rotation axis of the furnace body (104), the rotating joint (2122) has a plurality of adapter ports (2123) corresponding one-to-one to the plurality of spray pipes (213), one end of the adapter port (2123) is connected to the adapter cavity (2124), and the other end of the adapter port (2123) is connected to the corresponding spray pipe (213).

8. The denitration spray system according to claim 5, characterized in that: The regulating valve assembly (22) comprises: a main control valve (221), the main control valve (221) being disposed on the delivery pipe (211), and the main control valve (221) being used to adjust the flow rate of the mixture in the delivery pipe (211); A plurality of sub-control valves (222), the plurality of sub-control valves (222) corresponding one to the plurality of spray pipes (213), the sub-control valves (222) being arranged on the corresponding spray pipes (213), the sub-control valves (222) being used to adjust the flow of the mixture in the corresponding spray pipes (213).

9. The denitration spray system according to claim 1, characterized in that: The denitration spray system further comprises: a controller, the controller being communicatively connected to the regulating valve assembly (22), the controller being used to control the regulating valve assembly (22) to adjust the flow rate of the mixture flowing through the spray pipe assembly (21) according to the output of the industrial kiln (1000).

10. An industrial kiln, characterized in that: It comprises a furnace body (104) and a denitration spray system according to any one of claims 1 to 9.

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