In-furnace denitration equipment and method for breaking chemical bond constraint
By using high-pressure steam atomizing denitrifier in denitrification equipment and fully contacting it with nitrogen oxides, the problem of low utilization rate of denitrifiers in the prior art is solved, and more efficient denitrification effect and resource conservation are achieved.
Patent Information
- Application Number
- CN202510266666.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2019-05-27
- Publication Date
- 2025-05-27
AI Technical Summary
During the denitrification reaction of existing denitrification equipment, the utilization rate of denitrifier is low, and it is difficult to achieve complete denitrification under ultra-low emission standards.
A furnace denitrification equipment is designed to break the constraints of chemical bonds. The denitrition agent is atomized into fine mist points by using high-pressure steam in the denitrifier nozzle and spraying it to the coal-fired furnace to make it fully contact with the nitrogen oxide in the flue gas, and at the same time, the residual high-pressure steam is used to undergo a reduction reaction with the nitrogen oxide.
By expanding the surface area of the denitrifier and increasing the reaction rate, the utilization rate of the denitrifier is improved, the consumption of the denitrifier is reduced, and more thorough nitrogen oxide reduction is achieved, achieving the purpose of saving resources and reducing costs.
Smart Images
Figure CN120037767A_ABST
Abstract
Description
[0001] This case is a divisional application of a patent application for invention with an application date of May 27, 2019, an application number of 201910447726.2, and an invention title of "An In-furnace Denitration Device and Method for Breaking the Bond Constraint". Technical Field
[0002] The present invention relates to the field of in-furnace denitration methods for high-pressure steam boilers, and more particularly, to an in-furnace denitration device and method for breaking the bond constraint. Background Art
[0003] At present, coal-fired boilers are widely used in the north. During the operation of coal-fired boilers, a large amount of flue gas is emitted. The pollutants in the flue gas mainly come from SO2, CO, and NOX generated by the combustion of pulverized coal and coke powder. These pollutants enter the ambient air and cause pollution. The catalytic reduction method or the activated carbon adsorption and catalysis method is often used for denitration.
[0004] However, the efficiency of traditional denitration equipment is only about 78%, resulting in an increase in the consumption of denitration agents. At the same time, the phenomenon of ammonia escape is very serious. In particular, when the environmental protection emission standard reaches the ultra-low emission standard (particulate matter 10 mg / m 3 ; sulfur dioxide 35 mg / m 3 ; nitrogen oxides 50 mg / m 3 ), it is very difficult to achieve with traditional SNR and SNCR denitration methods. Summary of the Invention
[0005] In view of this, the present invention provides an in-furnace denitration device and method for breaking the bond constraint, aiming to solve the problem of low utilization rate of denitration agents in the existing denitration reaction process.
[0006] On the one hand, the present invention provides an in-furnace denitration device for breaking the bond constraint, including: a denitration agent nozzle, a liquid phase unit, a gas phase unit, and a coal-fired furnace, wherein,
[0007] The liquid phase unit is connected to the denitration agent nozzle for providing a liquid denitration agent;
[0008] The gas phase unit is connected to the denitration agent nozzle for providing high-pressure steam;
[0009] There are N denitration agent nozzles including two layers of space, namely a nozzle central layer arranged inside and a nozzle outer layer arranged outside the nozzle central layer, where N is an integer greater than 1. The denitration agent nozzles are connected to the top surface of the coal-fired furnace. On the one hand, the high-pressure steam carried by the nozzle outer layer is used to atomize the denitration agent ejected from the nozzle central layer into fine mist droplets, thereby expanding the surface area of the denitration agent and spraying the fine mist droplets into the coal-fired furnace, so that the fine mist droplets are in full contact with the nitrogen oxides in the flue gas. On the other hand, the remaining high-pressure steam reacts with the nitrogen oxides;
[0010] The coal-fired furnace is used as the place where the denitration reaction between the denitration agent and the nitrogen oxides takes place.
[0011] Further, in the in-furnace denitration equipment for breaking the chemical bond constraint described above, N mounting holes for installing the denitration agent nozzles are evenly arranged on the top surface of the coal-fired furnace.
[0012] Further, in the in-furnace denitration equipment for breaking the chemical bond constraint described above, the number N of the mounting holes is an integer greater than 1.
[0013] Further, in the in-furnace denitration equipment for breaking the chemical bond constraint described above, the liquid phase unit includes: a denitration agent storage tank and a denitration agent pump, where,
[0014] The denitration agent storage tank is connected to the denitration agent pump and is used to store the denitration agent;
[0015] The denitration agent pump is connected to the nozzle central layer and is used to provide power to transport the denitration agent from the denitration agent storage tank to the nozzle central layer.
[0016] Further, in the in-furnace denitration equipment for breaking the chemical bond constraint described above, the gas phase unit includes: a steam boiler, and the steam boiler is connected to the nozzle outer layer and is used to provide steam.
[0017] The beneficial effect of the present invention is that in the in-furnace denitration equipment for breaking the chemical bond constraint provided by the present invention, there is a denitration agent nozzle, and the denitration agent nozzle is connected to the coal-fired furnace. The high-pressure steam carried by the nozzle outer layer is used to atomize the denitration agent ejected from the nozzle central layer into fine mist droplets, thereby expanding the surface area of the denitration agent and spraying the fine mist droplets into the coal-fired furnace, so that the fine mist droplets are in full contact with the nitrogen oxides in the flue gas, the reaction rate increases, the reaction is more thorough, the utilization rate of the denitration agent increases, thereby reducing the consumption of the denitration agent, achieving the purpose of reducing resource waste and lowering costs.
[0018] Further, in the present invention, the remaining high-pressure steam is sprayed into the coal-fired furnace to react with nitrogen oxides. The principle is as follows: According to the principles of Brownian motion and intermolecular forces, the chemical bonds of high-temperature and high-pressure water vapor molecules are very unstable, and react with carbon to generate carbon monoxide and hydrogen: C + H2O = CO + H2; carbon monoxide and hydrogen participate in two chemical reactions respectively: CO + 2NO = CO2 + N2 and 2H2 + 2NO = 2H2O + N2; part of the hydrogen reacts with nitrogen to generate ammonia and reacts with nitric oxide to reduce it to nitrogen: N2 + 3H2 = 2NH3 and 6NO + 4NH3 = 5N2 + 6H2O. Therefore, nitrogen oxides are completely reduced, achieving the purpose of saving resources and reducing costs.
[0019] Further, in the present invention, N installation holes for installing the denitration agent nozzles are evenly opened on the top surface of the coal-fired furnace, where N is an integer greater than 1, so that fine mist droplets can be evenly sprayed downward in a large area from the top of the coal-fired furnace into the furnace chamber of the coal-fired furnace, so that the flue gas rising from the bottom to the top in the coal-fired furnace can all come into contact with and react with the fine mist droplets.
[0020] Further, a denitration agent pump is provided between the denitration agent storage tank and the denitration agent nozzle in the present invention, so that the denitration agent can be transported to the nozzle central layer at a specified rate, improving the operating efficiency of the equipment.
[0021] An in-furnace denitration method for breaking the bondage of chemical bonds includes:
[0022] The denitration agent pump provides power to transport the denitration agent from the denitration agent storage tank to the nozzle central layer of the denitration agent nozzle, and at the same time, high-pressure steam at a preset temperature is introduced from the steam boiler into the outer layer of the denitration agent nozzle.
[0023] On the one hand, the denitration agent nozzle atomizes the denitration agent ejected from the nozzle central layer into fine mist droplets through the high-pressure steam carried by the outer layer of the nozzle, thereby expanding the surface area of the denitration agent, and spraying the fine mist droplets into the coal-fired furnace, so that the fine mist droplets come into full contact with the nitrogen oxides in the flue gas to complete the denitration treatment. On the other hand, the remaining high-pressure steam is sprayed into the coal-fired furnace to make the remaining high-pressure steam react with nitrogen oxides. After the reaction is completed, the products are subjected to subsequent treatment.
[0024] Further, in the above in-furnace denitration method for breaking the bondage of chemical bonds, the concentration ratio of the denitration agent is 20%.
[0025] Further, in the above in-furnace denitration method for breaking the bondage of chemical bonds, the preset temperature of the high-pressure steam is 180°C - 220°C.
[0026] The beneficial effects of the present invention are as follows. In the in-furnace denitration method for breaking the chemical bond bondage provided by the present invention, the denitrating agent ejected from the central layer of the nozzle is atomized into fine mist droplets by the high-pressure steam carried by the outer layer of the nozzle, thereby expanding the surface area of the denitrating agent, and the fine mist droplets are sprayed onto the coal-fired furnace, so that the fine mist droplets are in full contact with the nitrogen oxides in the flue gas, the reaction rate increases, the reaction is more complete, the utilization rate of the denitrating agent increases, thereby reducing the consumption of the denitrating agent, achieving the purpose of reducing resource waste and lowering costs.
[0027] Further, in the present invention, the remaining high-pressure steam is sprayed into the coal-fired furnace to carry out a reduction reaction with nitrogen oxides. The principle is as follows: According to the principles of Brownian motion and intermolecular forces, the chemical bonds of high-temperature and high-pressure water vapor molecules are very unstable, and react with carbon to generate carbon monoxide and hydrogen: C + H2O = CO + H2; carbon monoxide and hydrogen participate in two chemical reactions respectively: CO + 2NO = CO2 + N2 and 2H2 + 2NO = 2H2O + N2; part of the hydrogen reacts with nitrogen to generate ammonia and reacts with nitric oxide to be reduced to nitrogen: N2 + 3H2 = 2NH3 and 6NO + 4NH3 = 5N2 + 6H2O. Therefore, the nitrogen oxides are completely reduced, achieving the purpose of saving resources and reducing costs.
[0028] Further, in the present invention, N mounting holes for installing the denitrating agent nozzles are evenly opened on the top surface of the coal-fired furnace, where N is an integer greater than 1, so that the fine mist droplets can be evenly sprayed downward from the top of the coal-fired furnace in a large area into the furnace of the coal-fired furnace, so that the flue gas rising from the bottom to the top in the coal-fired furnace can all come into contact with and react with the fine mist droplets.
[0029] Further, in the present invention, the denitrating agent is transported from the denitrating agent storage tank to the central layer of the nozzle by using the denitrating agent pump, so that the denitrating agent can be transported to the central layer of the nozzle at a specified rate, improving the operating efficiency of the equipment.
[0030] Further, in the present invention, by adjusting the temperature of the high-pressure steam to 180°C - 220°C, the temperature of the denitrating agent is increased, the reaction speed is accelerated, and the reaction efficiency is improved. Description of the Drawings
[0031] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components.
[0032] In the drawings:
[0033] Figure 1Schematic diagram of the in - furnace denitration equipment for breaking the bond constraint provided by the embodiments of the present invention;
[0034] Figure 2 Top view of the denitration agent nozzle provided by the embodiments of the present invention. Detailed implementation manners
[0035] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.
[0036] Refer to Figure 1 As shown, the in - furnace denitration equipment for breaking the bond constraint of the embodiments of the present invention includes: a liquid phase unit, a coal - fired furnace 3, a denitration agent nozzle 5, and a gas phase unit; wherein, the liquid phase unit is connected to the denitration agent nozzle 5 to provide a liquid denitration agent; the gas phase unit is connected to the denitration agent nozzle 5 to provide high - pressure steam; the denitration agent nozzle 5 is connected to the top surface of the coal - fired furnace 3 to atomize the denitration agent entering its interior into fine mist droplets; the coal - fired furnace 3 serves as a place for the denitration reaction between the denitration agent and the nitrogen oxides.
[0037] When the system operates, the liquid phase unit starts and transports the denitration agent to the denitration agent nozzle 5. At the same time, the gas phase unit starts and transports high - pressure steam to the denitration agent nozzle 5. The denitration agent nozzle 5 atomizes the denitration agent entering its interior into fine mist droplets and sprays the fine mist droplets into the furnace chamber of the coal - fired furnace 3. The fine mist droplets fully react with the flue gas in the furnace chamber of the coal - fired furnace 3. Then, the remaining high - pressure steam is sprayed into the coal - fired furnace 3 to cause a reduction reaction between the remaining high - pressure steam and the nitrogen oxides. After the reaction is completed, the products are subjected to subsequent treatment.
[0038] It can be understood that in this embodiment, the type of the connecting components between each part is not limited, as long as it can play a transmission role.
[0039] Please combine Figure 1-2As shown in the figure, the denitration agent nozzle 5 includes: a nozzle central layer 7 and a nozzle outer layer 2; wherein, the nozzle central layer 7 is arranged inside the denitration agent nozzle 5, and is connected to the liquid phase unit for receiving and spraying the denitration agent; the nozzle outer layer 2 is arranged outside the nozzle central layer 7, and is connected to the gas phase unit for receiving and spraying high-pressure steam. When the system operates, the high-pressure steam carried by the nozzle outer layer 2 atomizes the denitration agent sprayed out by the nozzle central layer 7 into fine mist droplets, thereby expanding the surface area of the denitration agent, and spraying the fine mist droplets into the coal-fired furnace 3, so that the fine mist droplets are in full contact with the nitrogen oxides in the flue gas. Then, the denitration agent nozzle 5 sprays the remaining high-pressure steam into the furnace chamber of the coal-fired furnace 3, so that the remaining high-pressure steam reacts with the nitrogen oxides; thereby increasing the reaction rate, making the reaction more complete, and improving the utilization rate of the denitration agent. It can be understood that in this embodiment, the number of the denitration agent nozzles 5 is not limited, and it can be configured according to the engineering requirements and the volume of the coal-fired furnace 3.
[0040] Specifically, the liquid phase unit includes: a denitration agent storage tank 1 and a denitration agent pump 2; wherein, the denitration agent storage tank 1 is connected to the denitration agent pump 2 for storing the denitration agent; the denitration agent pump 2 is connected to the nozzle central layer 7 for providing power to transport the denitration agent from the denitration agent storage tank 1 to the nozzle central layer 7. It can be understood that in this embodiment, the type of the denitration agent storage tank 1 is not limited, and it can be made of metal or non-metal, as long as it can carry the denitration agent. At the same time, the number of the denitration agent storage tanks 1 is not limited, and it can be configured according to the engineering requirements. Specifically, the gas phase unit includes: a steam boiler 4, and the steam boiler 4 is used for providing steam.
[0041] Specifically, N installation holes 6 are evenly opened on the top surface of the coal-fired furnace 3, where N is an integer greater than 1, and the installation holes 6 are used for installing the denitration agent nozzles 5. It can be understood that in this embodiment, the number of the side surfaces of the coal-fired furnace 3 where the installation holes 6 are opened is not limited, and the installation holes 6 can also be opened on the side surfaces other than the top surface.
[0042] The beneficial effect of the present invention is that in the in-furnace denitration equipment for breaking the chemical bond bondage provided by the present invention, there is a denitration agent nozzle 5, and the denitration agent nozzle 5 is connected to the coal-fired furnace 3. The high-pressure steam carried by the nozzle outer layer 2 atomizes the denitration agent sprayed out by the nozzle central layer 7 into fine mist droplets, thereby expanding the surface area of the denitration agent, and spraying the fine mist droplets into the coal-fired furnace 3, so that the fine mist droplets are in full contact with the nitrogen oxides in the flue gas. The reaction rate increases, the reaction is more complete, the utilization rate of the denitration agent increases, thereby reducing the consumption of the denitration agent, achieving the purpose of reducing resource waste and lowering costs.
[0043] Further, in the present invention, the remaining high-pressure steam is sprayed into the coal-fired furnace to react with nitrogen oxides. The principle is as follows: According to the principles of Brownian motion and intermolecular forces, the chemical bonds of high-temperature and high-pressure water vapor molecules are very unstable and react with carbon to form carbon monoxide and hydrogen: C + H2O = CO + H2; carbon monoxide and hydrogen participate in two chemical reactions respectively: CO + 2NO = CO2 + N2 and 2H2 + 2NO = 2H2O + N2; part of the hydrogen reacts with nitrogen to form ammonia and reacts with nitric oxide to be reduced to nitrogen: N2 + 3H2 = 2NH3 and 6NO + 4NH3 = 5N2 + 6H2O. Therefore, nitrogen oxides are completely reduced, achieving the purpose of saving resources and reducing costs.
[0044] Further, in the present invention, N mounting holes 6 for installing the denitration agent nozzles 5 are evenly opened on the top surface of the coal-fired furnace 3, where N is an integer greater than 1, so that fine mist droplets can be evenly sprayed downward from the uppermost part of the coal-fired furnace 3 over a large area into the furnace chamber of the coal-fired furnace 3, so that the flue gas rising from the bottom to the top in the coal-fired furnace 3 can all come into contact with and react with the fine mist droplets.
[0045] Further, a denitration agent pump 2 is provided between the denitration agent storage tank 1 and the denitration agent nozzle 5 in the present invention, so that the denitration agent can be transported to the nozzle central layer 7 at a specified rate, improving the operating efficiency of the equipment.
[0046] An in-furnace denitration method for breaking the bondage of chemical bonds includes the following steps:
[0047] (a) The denitration agent pump 2 provides power to transport the denitration agent with a concentration ratio of 20% from the denitration agent storage tank 1 to the nozzle central layer 7 of the denitration agent nozzle 5, and at the same time, high-pressure steam with a temperature of 180°C - 220°C is introduced from the steam boiler 4 into the nozzle outer layer 2 of the denitration agent nozzle 5.
[0048] (b) The denitration agent nozzle 5 atomizes the denitration agent ejected from the nozzle central layer 7 into fine mist droplets through the high-pressure steam carried by the nozzle outer layer 2, thereby expanding the surface area of the denitration agent, and spraying the fine mist droplets into the coal-fired furnace 3, so that the fine mist droplets come into full contact with the nitrogen oxides in the flue gas to complete the denitration treatment. Then, the remaining high-pressure steam is sprayed into the coal-fired furnace to cause the remaining high-pressure steam to react with the nitrogen oxides. After the reaction is completed, the products are subjected to subsequent treatment.
[0049] Example 1
[0050] The denitration agent pump 2 provides power to transport the denitration agent with a concentration ratio of 20% from the denitration agent storage tank 1 to the nozzle central layer 7 of the denitration agent nozzle 5. At the same time, high-pressure steam at a temperature of 180 °C is introduced from the steam boiler 4 into the nozzle outer layer 2 of the denitration agent nozzle 5. The denitration agent nozzle 5 atomizes the denitration agent ejected from the nozzle central layer 7 into fine mist droplets through the high-pressure steam carried by the nozzle outer layer 2, and sprays the fine mist droplets and the remaining high-pressure steam into the coal-fired furnace 3 with a flue gas volume of 50000 m 3 where the amount of nitrogen oxides contained in the flue gas is 20000000 (mg / m 3 .h). The fine mist droplets and the remaining high-pressure steam are respectively in full contact with the nitrogen oxides in the flue gas. After the reaction is completed, the mass of the denitration agent used is detected to be 27 kg.
[0051] Example 2
[0052] The denitration agent pump 2 provides power to transport the denitration agent with a concentration ratio of 20% from the denitration agent storage tank 1 to the nozzle central layer 7 of the denitration agent nozzle 5. At the same time, high-pressure steam at a temperature of 200 °C is introduced from the steam boiler 4 into the nozzle outer layer 2 of the denitration agent nozzle 5. The denitration agent nozzle 5 atomizes the denitration agent ejected from the nozzle central layer 7 into fine mist droplets through the high-pressure steam carried by the nozzle outer layer 2, and sprays the fine mist droplets and the remaining high-pressure steam into the coal-fired furnace 3 with a flue gas volume of 150000 m 3 where the amount of nitrogen oxides contained in the flue gas is 60000000 (mg / m 3 .h). The fine mist droplets and the remaining high-pressure steam are respectively in full contact with the nitrogen oxides in the flue gas. After the reaction is completed, the mass of the denitration agent used is detected to be 80 kg.
[0053] Example 3
[0054] The denitration agent pump 2 provides power to transport the denitration agent with a concentration ratio of 20% from the denitration agent storage tank 1 to the nozzle central layer 7 of the denitration agent nozzle 5. At the same time, high-pressure steam at a temperature of 220 °C is introduced from the steam boiler 4 into the nozzle outer layer 2 of the denitration agent nozzle 5. The denitration agent nozzle 5 atomizes the denitration agent ejected from the nozzle central layer 7 into fine mist droplets through the high-pressure steam carried by the nozzle outer layer 2, and sprays the fine mist droplets and the remaining high-pressure steam into the coal-fired furnace 3 with a flue gas volume of 200000 m 3 where the amount of nitrogen oxides contained in the flue gas is 80000000 (mg / m 3 .h). The fine mist droplets and the remaining high-pressure steam are respectively in full contact with the nitrogen oxides in the flue gas. After the reaction is completed, the mass of the denitration agent used is detected to be 105 kg.
[0055] Comparative Example
[0056] The denitration agent pump 2 provides power to transport the denitration agent with a concentration ratio of 20% from the denitration agent storage tank 1 to the coal-fired furnace 3 with a flue gas volume of 150,000 m 3 , where the amount of nitrogen oxides contained in the flue gas is 60,000,000 (mg / m 3 .h). The denitration agent reacts with the nitrogen oxides. After the reaction is completed, the mass of the denitration agent used is detected to be 135 kg.
[0057] From the comparison between the above embodiments and the comparative examples, it can be concluded that in the present invention, the denitration agent is atomized into fine mist droplets by using the denitration agent nozzle 5, thereby expanding the surface area of the denitration agent, and the fine mist droplets are sprayed into the coal-fired furnace 3, so that the fine mist droplets are in full contact with the nitrogen oxides in the flue gas, thereby increasing the reaction rate and making the reaction more thorough, thereby improving the utilization rate of the denitration agent. At the same time, the remaining high-pressure steam reacts with the nitrogen oxides to reduce the consumption of the denitration agent and lower the reaction cost.
[0058] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent methods, the present invention is also intended to include these modifications and variations.
Claims
1. An in - furnace denitration method for breaking the bond constraint, characterized in that, it includes: The denitration agent pump provides power to transport the denitration agent from the denitration agent storage tank to the nozzle central layer of the denitration agent nozzle, and at the same time, high - pressure steam at a preset temperature is introduced from the steam boiler into the nozzle outer layer of the denitration agent nozzle; On the one hand, the denitration agent nozzle atomizes the denitration agent ejected from the nozzle central layer into fine mist droplets through the high - pressure steam carried by the nozzle outer layer, thereby expanding the surface area of the denitration agent, and spraying the fine mist droplets into the coal - fired furnace, so that the fine mist droplets are in full contact with the nitrogen oxides in the flue gas to complete the denitration treatment. On the other hand, the remaining high - pressure steam is sprayed into the coal - fired furnace, and the remaining high - pressure steam reacts with the nitrogen oxides. After the reaction is completed, the products are subjected to subsequent treatment; wherein, the preset temperature of the high - pressure steam is 180°C - 220°C.
2. The in - furnace denitration method for breaking the bond constraint according to claim 1, characterized in that, the concentration ratio of the denitration agent is 20%.
3. An in - furnace denitration device for breaking the bond constraint, characterized in that, it includes: a denitration agent nozzle, a liquid phase unit, a gas phase unit and a coal - fired furnace, wherein, the liquid phase unit is connected to the denitration agent nozzle to provide liquid denitration agent; the gas phase unit is connected to the denitration agent nozzle to provide high - pressure steam; the denitration agent nozzle includes two layers of space, a nozzle central layer arranged inside and a nozzle outer layer arranged outside the nozzle central layer, and the number of the denitration agent nozzles is N, where N is an integer greater than 1. The denitration agent nozzle is connected to the top surface of the coal - fired furnace. On the one hand, it is used to atomize the denitration agent ejected from the nozzle central layer into fine mist droplets through the high - pressure steam carried by the nozzle outer layer, thereby expanding the surface area of the denitration agent, and spraying the fine mist droplets into the coal - fired furnace, so that the fine mist droplets are in full contact with the nitrogen oxides in the flue gas. On the other hand, the remaining high - pressure steam is sprayed into the coal - fired furnace to react with the nitrogen oxides; the coal - fired furnace is used as the place for the denitration reaction between the denitration agent and the nitrogen oxides, wherein the preset temperature of the high - pressure steam is 180°C - 220°C.
4. The in - furnace denitration device for breaking the bond constraint according to claim 3, characterized in that, the top surface of the coal - fired furnace is evenly provided with N installation holes for installing the denitration agent nozzle.
5. The in - furnace denitration device for breaking the bond constraint according to claim 4, characterized in that, the number N of the installation holes is an integer greater than 1.
6. The in - furnace denitration device for breaking the bond constraint according to claim 3, characterized in that, the liquid phase unit includes: a denitration agent storage tank and a denitration agent pump, wherein, the denitration agent storage tank is connected to the denitration agent pump to store the denitration agent; the denitration agent pump is connected to the nozzle central layer to provide power to transport the denitration agent from the denitration agent storage tank to the nozzle central layer.
7. The in - furnace denitration device for breaking the bond constraint according to claim 3, characterized in that, The gas phase unit includes: a steam boiler, which is connected to the outer layer of the nozzle to provide steam.