A coke oven denitrification process

Abstract

The present invention discloses a coke oven denitration process. Denitration liquid enters a denitration pipe from one end. A denitration nozzle is mounted on the denitration pipe. The angle C between the denitration nozzle outlet and the flue gas inlet of the regenerator is greater than or equal to 90° and less than or equal to 180°. The denitration liquid enters the denitration nozzle from the denitration pipe and is sprayed into the regenerator along the denitration nozzle outlet. Denitration pipes with upper round openings and exposed duckbills have the best denitration effect, followed by side round openings, and the worst denitration effect is achieved by side flattened openings.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas denitration, in particular to a coke oven denitration process. Background Art

[0002] Coke ovens generate large amounts of combustion exhaust gases during their production process, which contain significant amounts of nitrogen oxides (NOx). Direct emissions of these gases cause significant environmental pollution. my country mandated that coking plants comply with the GB16171-2012 emission standard effective January 1, 2015. This means that exhaust gases from coking plants must undergo denitrification treatment before being discharged.

[0003] In existing technology, denitrification is carried out within a regenerator, where a denitrification pipeline is installed with intermittently arranged spray holes, through which ammonia water or ammonia gas flows. Ammonia water or ammonia gas is sprayed into the regenerator through the spray holes, reacting with nitrogen oxides to achieve a primary denitrification process. The resulting coke oven exhaust gas passes through a denitrification catalytic layer, where it reacts with the denitrification catalyst to achieve a secondary denitrification process. The removal of nitrogen oxides from the exhaust gas allows it to meet national emission standards. The denitrification rate determines whether the exhaust gas meets national emission standards, while the denitrification efficiency determines the amount of exhaust gas processed per unit time. Assuming the exhaust gas composition and denitrification substances remain unchanged, it is necessary to optimize the structure and arrangement of the nozzles in the denitrification pipeline to improve denitrification efficiency. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a coke oven denitrification process which is beneficial to improving the denitrification rate.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A coke oven denitration process, wherein a denitration liquid enters a denitration pipe from one end thereof, a denitration nozzle is installed on the denitration pipe, an angle C between the outlet direction of the denitration nozzle and the flue gas inlet direction of a regenerator is greater than or equal to 90° and less than or equal to 180°, the denitration liquid enters the denitration nozzle from the denitration pipe, and is sprayed into the regenerator along the outlet direction of the denitration nozzle.

[0007] In the above-mentioned coke oven denitrification process, the denitrification nozzle is in the shape of a truncated cone with a large cross-sectional area at the inlet end and a small cross-sectional area at the outlet end.

[0008] In the above-mentioned coke oven denitrification process, the denitrification nozzle is in the shape of a truncated pyramid with a large cross-sectional area at the inlet end and a small cross-sectional area at the outlet end.

[0009] In the above-mentioned coke oven denitrification process, the truncated pyramid shape is a quadrangular pyramid with a rectangular cross section.

[0010] In the above-mentioned coke oven denitrification process, the denitrification nozzle is in a duckbill shape with a large cross-sectional area at the inlet end and a small cross-sectional area at the outlet end.

[0011] In the above-mentioned coke oven denitrification process, the angle C between the outlet direction of the denitrification nozzle and the flue gas inlet direction of the regenerator is greater than or equal to 90° and less than or equal to 135°, and the denitrification nozzles are installed on both sides of the denitrification pipe.

[0012] In the above-mentioned coke oven denitrification process, the angle C between the outlet direction of the denitrification nozzle and the flue gas inlet direction of the regenerator is greater than 135° and less than or equal to 180°, and the denitrification nozzle is installed on one side of the denitrification pipe.

[0013] In the above-mentioned coke oven denitrification process, the angle C between the outlet direction of the denitrification nozzle and the flue gas inlet direction of the regenerator is 180°.

[0014] In the above-mentioned coke oven denitrification process, a turbulent nozzle is installed on the denitrification pipe between two adjacent denitrification nozzles, and the cross-sectional area of ​​the outlet of the turbulent nozzle is 5% to 10% of the cross-sectional area of ​​the outlet of the denitrification nozzle; the turbulent nozzle is composed of a regular quadrangular prism section, a first frustum section and a second frustum section, the first frustum section is located between the regular quadrangular prism section and the second frustum section, and the large end of the first frustum section is fluidically conductive with the regular quadrangular prism section, the small end of the first frustum section is fluidically conductive with the large end of the second frustum section, the small end of the second frustum section is the outlet end of the denitrification material, and the angle E between the small end of the second frustum section and the flue gas inlet direction of the regenerator is 15 0°-160°; the axis of the regular quadrangular prism section is parallel to the flue gas inlet direction of the heat storage chamber; the two opposite side walls of the regular quadrangular prism section extend to the first frustum section and the second frustum section, and serve as the two opposite side walls of the first frustum section and the two opposite side walls of the second frustum section; the other two opposite side walls of the first frustum section are the first side wall and the second side wall, respectively, and the other two opposite side walls of the second frustum section are the third side wall and the fourth side wall, respectively; the second side wall and the fourth side wall are integrally extended side walls, and the angle F between the first side wall and the horizontal plane is 60-65°; the angle G between the first side wall and the horizontal plane is 75-80°, and the third side wall is perpendicular to the horizontal plane.

[0015] In the above-mentioned coke oven denitration process, the small ends of the second frustum sections on both sides of the midpoint of the denitration tube are oriented in opposite directions.

[0016] The technical solution of the present invention achieves the following beneficial technical effects:

[0017] 1. A distribution cloud of the reactant NH3 on the transverse cross-section of the nozzle reveals that in the upper circular denitrification tube, the upward spray of NH3 encounters the checker bricks, causing diffusion. This widens the distribution range of NH3, facilitating a full reaction. This is clearly reflected in the reaction rate distribution cloud on the longitudinal cross-section and the distribution cloud of the reaction product H2O on the transverse cross-section. Expanding the transverse distribution range of NH3 within a small cavity can effectively improve the denitrification rate, and this perspective can be used to optimize the denitrification tube model.

[0018] 2. The average denitrification rate can reflect the overall denitrification effect of the denitrification pipe. The order of denitrification effect is: upper round-mouth denitrification pipe ≈ exposed duckbill-type denitrification pipe > side round-mouth denitrification pipe > side flat-mouth denitrification pipe.

[0019] 3. In order to expand the lateral distribution range of NH3, a spoiler nozzle is installed on the denitrification pipe at the midpoint between the two adjacent denitrification nozzles of the upper circular mouth denitrification pipe. The spoiler nozzle has three levels of gradually decreasing cross-sectional area, two opposite side walls are shared between the three levels, and one side wall is shared between the last two levels, so that the outlet wind speed and injection distance of the spoiler nozzle 3 will be increased. The spray direction of the spoiler nozzle is upward at an angle of 66° and the outlet cross-section is rectangular or parallelogram, which can form a uniform fan-shaped wind domain, thereby expanding the lateral distribution range of NH3 ejected from the truncated cone-shaped denitrification nozzle and improving the uniformity of NH3 distribution.

[0020] 4. On both sides of the midpoint of the denitrification pipe, the direction D of the small end of the second frustum section is opposite. This not only effectively reduces the lateral distribution range of NH3, but also makes the lateral distribution of NH3 more uniform. Compared with adding the same number of frustum-shaped denitrification nozzles, the flue gas treatment capacity per unit time is increased by more than 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a partial top view of the side-round denitration pipe of the present invention;

[0022] Figure 2 A schematic side view of the structure of the side round-mouth denitrification tube of the present invention;

[0023] Figure 3 A schematic diagram of a partial top view of the side-flattened denitrification pipe of the present invention;

[0024] Figure 4 A schematic side view of the structure of the flat-mouth denitrification tube of the present invention;

[0025] Figure 5 A schematic diagram of the partial structure of the upper circular-mouth denitration pipe in the present invention, taken along a direction perpendicular to the axis of the denitration pipe;

[0026] Figure 6 A schematic structural diagram of the upper circular-mouth denitration pipe in the present invention along a direction parallel to the axis of the denitration pipe;

[0027] Figure 7 A schematic diagram of a partial top view of the structure of the duckbill-shaped denitrification pipe in the present invention;

[0028] Figure 8 A schematic diagram of the three-dimensional structure of the duckbill-shaped denitrification pipe in the present invention;

[0029] Figure 9a A schematic structural diagram of the flow-turbulating nozzle of the present invention; Figure 9b Schematic diagram of the structure of the turbulent nozzle installed on the denitrification pipe in the present invention;

[0030] Figure 10 Fluid domain model inside the thermal storage chamber for denitrification pipe flow field simulation experiment;

[0031] Figure 11 Fluid domain model of thermal storage chamber with checker bricks in denitrification pipe flow field simulation experiment;

[0032] Figure 12a Distribution cloud of the reaction product H2O on the transverse section where the nozzle is located (side circular port denitrification pipe);

[0033] Figure 12b Distribution cloud of the reaction product H2O on the transverse section where the nozzle is located (lateral flattened denitrification pipe);

[0034] Figure 12c Distribution cloud of the reaction product H2O on the transverse section where the nozzle is located (upper circular denitrification pipe);

[0035] Figure 12d Distribution cloud of the reaction product H2O on the transverse section where the nozzle is located (exposing the duckbill-shaped denitrification pipe);

[0036] Figure 13a Distribution cloud of the reaction product H2O on the longitudinal section where the nozzle is located (side circular port denitrification pipe);

[0037] Figure 13b Distribution cloud of the reaction product H2O on the longitudinal section where the nozzle is located (lateral flattened denitrification pipe);

[0038] Figure 13c Distribution cloud of the reaction product H2O on the longitudinal section where the nozzle is located (upper circular denitrification pipe);

[0039] Figure 13d Distribution cloud of the reaction product H2O on the longitudinal section where the nozzle is located (exposing the duckbill-shaped denitrification pipe);

[0040] Figure 14a Distribution cloud diagram of the reactant NH3 on the horizontal section where the nozzle is located (side circular port denitrification pipe);

[0041] Figure 14b Distribution cloud diagram of the reactant NH3 on the horizontal section where the nozzle is located (lateral flattened denitrification pipe);

[0042] Figure 14c Distribution cloud diagram of the reactant NH3 on the horizontal section where the nozzle is located (upper circular denitrification pipe);

[0043] Figure 14d Distribution cloud of the reactant NH3 on the horizontal section where the nozzle is located (exposing the duckbill-shaped denitrification pipe);

[0044] Figure 15a Distribution cloud diagram of the reactant NH3 on the longitudinal section where the nozzle is located (side circular port denitrification pipe);

[0045] Figure 15b Distribution cloud diagram of the reactant NH3 on the longitudinal section where the nozzle is located (lateral flattened denitrification pipe);

[0046] Figure 15c Distribution cloud diagram of the reactant NH3 on the longitudinal section where the nozzle is located (upper circular denitrification pipe);

[0047] Figure 15d Distribution cloud of the reactant NH3 on the longitudinal section where the nozzle is located (exposing the duckbill-shaped denitrification pipe);

[0048] Figure 16a Reaction rate distribution cloud diagram on the longitudinal section where the nozzle is located (side circular port denitrification pipe);

[0049] Figure 16b Reaction rate distribution cloud diagram on the longitudinal section where the nozzle is located (lateral flattened denitrification pipe);

[0050] Figure 16c Reaction rate distribution cloud diagram on the longitudinal section where the nozzle is located (upper circular denitrification pipe);

[0051] Figure 16d Reaction rate distribution cloud diagram on the longitudinal section where the nozzle is located (exposing the duckbill-shaped denitrification pipe);

[0052] Figure 17 The influence of the mass flow rate of NH3 at the nozzle on the corresponding denitrification rate in the four original denitrification pipe schemes;

[0053] Figure 18 Mass flow rate of the nozzle in four original denitrification pipe schemes and the optimized nozzle cross-sectional size scheme;

[0054] Figure 19 Average denitrification rates of four original denitrification pipe schemes and the optimized nozzle cross-sectional size scheme;

[0055] Figure 20 The mass flow rate of the nozzle in the original scheme of the side round-mouth denitrification pipe and the side flat-mouth denitrification pipe and the total NH3 flow optimization scheme;

[0056] Figure 21 The average denitrification rate of the original scheme of the side round-mouth denitrification pipe and the side flat-mouth denitrification pipe and the total NH3 flow optimization scheme.

[0057] The reference numerals in the figure are as follows: 1-denitrification pipe; 2-denitrification nozzle; 3-turbulent nozzle; 31-regular quadrangular prism section; 32-first frustum section; 33-second frustum section; 321-first side wall; 322-second side wall; 331-third side wall; 332-fourth side wall; A-denitrification nozzle outlet direction; B-heat storage chamber flue gas inlet direction; D-direction of the small end of the second frustum section. DETAILED DESCRIPTION

[0058] The denitration tubes used in the coke oven denitration process of this embodiment are as follows:

[0059] (1) Side-round denitration pipe: Denitration liquid enters the denitration pipe 1 from one end. A denitration nozzle 2 is installed on the denitration pipe 1. The angle C between the denitration nozzle outlet direction A and the regenerator flue gas inlet direction B is equal to 97°. The denitration liquid enters the denitration nozzle 2 from the denitration pipe 1 and is sprayed into the regenerator along the denitration nozzle outlet direction A. The denitration nozzle 2 is a truncated cone with a large cross-sectional area at the inlet end and a small cross-sectional area at the outlet end.

[0060] (2) Laterally flattened denitration pipe: Denitration liquid enters the denitration pipe 1 from one end. A denitration nozzle 2 is installed on the denitration pipe 1. The angle C between the denitration nozzle outlet direction A and the regenerator flue gas inlet direction B is equal to 95°. The denitration liquid enters the denitration nozzle 2 from the denitration pipe 1 and is sprayed into the regenerator along the denitration nozzle outlet direction A. The denitration nozzle 2 is a rectangular frustum with a large cross-sectional area at the inlet end and a small cross-sectional area at the outlet end.

[0061] (3) Upper round-mouth denitrification pipe: Denitrification liquid enters the denitrification pipe 1 from one end. A denitrification nozzle 2 is installed on the denitrification pipe 1. The angle C between the denitrification nozzle outlet direction A and the regenerator flue gas inlet direction B is equal to 180°. The denitrification liquid enters the denitrification nozzle 2 from the denitrification pipe 1 and is sprayed into the regenerator along the denitrification nozzle outlet direction A. The denitrification nozzle 2 is a truncated cone with a large cross-sectional area at the inlet end and a small cross-sectional area at the outlet end.

[0062] (4) Exposed duckbill denitrification pipe: Denitrification liquid enters the denitrification pipe 1 from one end. A denitrification nozzle 2 is installed on the denitrification pipe 1. The angle C between the outlet direction A of the denitrification nozzle and the flue gas inlet direction B of the regenerator is equal to 90°. The denitrification liquid enters the denitrification nozzle 2 from the denitrification pipe 1 and is sprayed into the regenerator along the outlet direction A of the denitrification nozzle. The denitrification nozzle 2 is a duckbill shape with a large cross-sectional area at the inlet end and a small cross-sectional area at the outlet end.

[0063] Denitrification pipe flow field simulation experiment report

[0064] 1. The mathematical model in the denitrification pipe flow field simulation experiment is as follows:

[0065] 1. During the entire working cycle, assuming that NH3 and NO x The flow rate is a constant value.

[0066] 2. For each design scheme, the steady-state incompressible turbulent flow solver is used to calculate the flow field of the gas in the denitrification pipe, and the turbulence model adopts the K-Eplishon two-equation model.

[0067] 3. Ignore the effect of temperature changes and assume that NH3 only reacts with NO or NO2 without other side reactions or reverse reactions.

[0068] 4. Since the denitrification pipe basin has a spatially symmetrical structure, 1 / 2 of the basin is taken as the calculation object, and the symmetric surface is treated with symmetric numerical boundaries.

[0069] 2. Plan

[0070] The denitrification tube used in this experiment has a total of 48 nozzles, which are numbered in sequence from P1 to P48. The closer to the NH3 inlet, the smaller the number. The above four denitrification tubes are used for the experiment.

[0071] The experimental method is as follows:

[0072] The denitrification pipe used in this experiment has a total of 48 nozzles, which are numbered in sequence from P1 to P48, with the closer to the NH3 inlet, the smaller the number.

[0073] A denitrification pipe is placed in a thermal storage chamber. Assuming that there are checker bricks in the thermal storage chamber and two nozzles in each small cavity, a small cavity is selected as the research object, and its schematic diagram is shown as follows: Figure 11As shown, it is assumed that the gas in the regenerator flows through the gaps in the checker bricks, with a width of 20 mm. The overall fluid domain is 200 mm long, 150 mm wide, and approximately 2 m high. NOx-containing flue gas is blown in from top to bottom at a velocity of 2 m / s and a constant temperature of 1000°C. The NH3 inlet of the denitrification tube is a mass flow inlet with a flow rate of 8.41 m / s and a temperature of 25°C. NH3 is ejected from the nozzle, and the outlet is a pressure outlet.

[0074] Table 1. Original / optimized test schemes for each denitrification tube

[0075]

[0076] 3. Experiment 2 Denitrification Tube Flow Field Results

[0077] 3.1、The distribution cloud diagram of the reaction product H2O on the transverse section where the nozzle is located, such as Figure 12a 、 Figure 12b 、 Figure 12c and Figure 12d shown.

[0078] 3.2. The distribution cloud of the reaction product H2O on the longitudinal section where the nozzle is located, such as Figure 13a 、 Figure 13b 、 Figure 13c and Figure 13d shown.

[0079] 3.3、The distribution cloud diagram of the reactant NH3 on the horizontal section where the nozzle is located, such as Figure 14a 、 Figure 14b 、 Figure 14c and Figure 14d shown.

[0080] 3.4. The distribution cloud of the reactant NH3 on the longitudinal section where the nozzle is located, such as Figure 15a 、 Figure 15b 、 Figure 15c and Figure 15d shown.

[0081] 3.5. The reaction rate distribution cloud diagram on the longitudinal section where the nozzle is located, such as Figure 16a 、 Figure 16b 、 Figure 16c and Figure 16d shown.

[0082] 4. Results Analysis

[0083] 4.1. Effect of NH3 mass flow rate at each nozzle on the corresponding denitrification rate

[0084] Depend on Figure 17The original design shows that the NH3 mass flow rate distribution pattern within the four denitrification pipes is the same: as the nozzle number gradually increases, the mass flow rate across the nozzle cross section gradually decreases, and finally stabilizes. The denitrification rate variation pattern for each denitrification pipe is consistent with the flow rate distribution pattern. The order of denitrification performance is: upper round-mouth denitrification pipe > exposed duckbill denitrification pipe > side flat-mouth denitrification pipe ≈ side round-mouth denitrification pipe.

[0085] It can be seen from this that balancing or increasing the mass flow rate of NH3 at the nozzle is beneficial to improving the overall denitrification rate of the denitrification pipe.

[0086] 4.2 Effect of nozzle cross-sectional dimensions on the mass flow rate of NH3 at the corresponding nozzle

[0087] Depend on Figure 19 It can be seen that appropriately increasing the cross-sectional size of the long-distance nozzle can balance the mass flow rate of NH3 at each nozzle, which has a significant effect on improving the denitrification rate of the upper circular mouth denitrification pipe and the exposed duckbill type denitrification pipe, but the optimization of the side circular mouth denitrification pipe and the side flat mouth denitrification pipe is not ideal.

[0088] 4.3. Influence of the total NH3 flow rate in the denitrification pipe on the mass flow rate of NH3 at each nozzle

[0089] Depend on Figure 21 It can be seen that increasing the total NH3 flow at the denitrification pipe inlet will increase the mass flow of each nozzle section, which has a significant effect on improving the denitrification rate of the side round-mouth denitrification pipe and the side flat-mouth denitrification pipe.

[0090] V. Conclusion

[0091] 1. Through the distribution cloud maps of the longitudinal section where the nozzle is located, it was found that the reaction areas of the denitrification tubes of the four different nozzles are roughly the same, all at the junction of the NH3 and NOx distribution areas, and the area with the most intense reaction is near the nozzle; the distribution areas of the reactant NH3 and the reaction product H2O almost overlap.

[0092] 2. The distribution cloud of the reactant NH3 on the transverse cross-section of the nozzle reveals that in the upper circular denitrification tube, the upward spray of NH3 encounters the checker bricks, causing diffusion. This widens the distribution range of NH3, facilitating a full reaction. This is clearly reflected in the reaction rate distribution cloud on the longitudinal cross-section and the distribution cloud of the reaction product H2O on the transverse cross-section. This indicates that expanding the transverse distribution range of NH3 within a small cavity can effectively improve the denitrification rate, and this perspective can be used to optimize the denitrification tube model.

[0093] 3. In the original plan, the upper round-mouth and exposed duckbill denitrification pipes have the best denitrification effect, followed by the side round-mouth denitrification pipe, and the side flat-mouth denitrification pipe has the worst denitrification effect.

[0094] 4. For the side round-mouth denitrification pipe and the side flat-mouth denitrification pipe, changing the nozzle cross-sectional size has no obvious effect on improving the denitrification rate, but increasing the NH3 flow rate introduced can effectively improve the denitrification rate; for the upper round-mouth denitrification pipe and the exposed duckbill type denitrification pipe, appropriately increasing the cross-sectional size of the long-distance nozzle can significantly improve the denitrification rate.

[0095] 5. When the same amount of NH3 is introduced into the denitrification pipe, the different shapes of the denitrification pipe nozzles will cause different amounts of NH3 to be ejected from the nozzles with the same number on each denitrification pipe. The amount of NH3 ejected from the nozzles will greatly affect the denitrification rate. The order of denitrification effects is: upper round-mouth denitrification pipe ≈ exposed duckbill-type denitrification pipe > side round-mouth denitrification pipe > side flat-mouth denitrification pipe.

[0096] In order to expand the horizontal distribution range of NH3, a turbulent nozzle 3 is installed on the denitrification pipe 1 at the midpoint between the two adjacent denitrification nozzles 2 of the upper circular denitrification pipe. The outlet cross-sectional area of ​​the turbulent nozzle 3 is 10% of the outlet cross-sectional area of ​​the denitrification nozzle; Figure 9a As shown, the turbulent nozzle 3 is composed of a regular quadrangular prism section 31, a first frustum section 32 and a second frustum section 33. The first frustum section 32 is located between the regular quadrangular prism section 31 and the second frustum section 33, and the large end of the first frustum section 32 is in fluid communication with the regular quadrangular prism section 31, the small end of the first frustum section 32 is in fluid communication with the large end of the second frustum section 33, the small end of the second frustum section 33 is the outlet end of the denitrification material, and the angle E between the direction D of the small end of the second frustum section 33 and the direction B of the flue gas inlet of the heat storage chamber is 156°; the axis of the regular quadrangular prism section 31 is parallel to the direction B of the flue gas inlet of the heat storage chamber; The two opposite side walls of the regular quadrangular prism segment 31 extend to the first frustum segment 32 and the second frustum segment 33, and serve as the two opposite side walls of the first frustum segment 32 and the two opposite side walls of the second frustum segment 33; the other two opposite side walls of the first frustum segment 32 are the first side wall 321 and the second side wall 322, respectively, and the other two opposite side walls of the second frustum segment 33 are the third side wall 331 and the fourth side wall 332, respectively; the second side wall 322 and the fourth side wall 332 are integrally extended side walls, and the angle F between them and the horizontal plane is 64°; the angle G between the first side wall 321 and the horizontal plane is 80°, and the third side wall 331 is perpendicular to the horizontal plane. The spoiler nozzle 3 has three levels of gradually decreasing cross-sectional areas, and the three levels share two opposite side walls, and the last two levels share one side wall, so that the outlet wind speed and spray distance of the spoiler nozzle 3 are increased. The spray direction of the spoiler nozzle 3 is upward at an angle of 66 degrees, and the outlet cross-section is rectangular or parallelogram, which can form a uniform fan-shaped wind field, thereby expanding the lateral distribution range of NH3 sprayed from the frustum-shaped denitrification nozzle and improving the uniformity of NH3 distribution. Figure 9bAs shown, on both sides of the midpoint of the denitrification pipe 1, the directions D of the small ends of the second frustum section 33 are opposite, which not only effectively reduces the lateral distribution range of NH3, but also makes the lateral distribution of NH3 more uniform. Compared with adding the same number of frustum-shaped denitrification nozzles, the flue gas treatment capacity per unit time is increased by more than 20%.

[0097] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the claims of this patent application.

Claims

1. A coke oven denitrification process, characterized in that: Denitrification liquid enters the denitrification pipe (1) from one end of the denitrification pipe (1), a denitrification nozzle (2) is installed on one side of the denitrification pipe (1), and the angle C between the outlet direction (A) of the denitrification nozzle and the flue gas inlet direction (B) of the heat storage chamber is equal to 180 degrees. The denitrification liquid enters the denitrification nozzle (2) from the denitrification pipe (1) and is sprayed into the heat storage chamber along the outlet direction (A) of the denitrification nozzle; A turbulent nozzle (3) is installed on the denitrification pipe (1) between two adjacent denitrification nozzles (2), and the outlet cross-sectional area of ​​the turbulent nozzle (3) is 5% to 10% of the outlet cross-sectional area of ​​the denitrification nozzle; the turbulent nozzle (3) is composed of a regular quadrangular prism section (31), a first frustum section (32) and a second frustum section (33), the first frustum section (32) is located between the regular quadrangular prism section (31) and the second frustum section (33), and the large end of the first frustum section (32) is fluidically connected to the regular quadrangular prism section (31), the small end of the first frustum section (32) is fluidically connected to the large end of the second frustum section (33), the small end of the second frustum section (33) is the outlet end of the denitrification material, and the angle E between the direction (D) of the small end of the second frustum section (33) and the flue gas inlet direction (B) of the heat storage chamber is 150°-160°; The axis of the regular quadrangular prism section (31) is parallel to the flue gas inlet direction (B) of the heat storage chamber; the two opposite side walls of the regular quadrangular prism section (31) extend to the first frustum section (32) and the second frustum section (33), and serve as the two opposite side walls of the first frustum section (32) and the two opposite side walls of the second frustum section (33); the other two opposite side walls of the first frustum section (32) are respectively the first side wall (321) and the second side wall (322), and the other two opposite side walls of the second frustum section (33) are respectively the third side wall (331) and the fourth side wall (332); the second side wall (322) and the fourth side wall (332) are integrally extended side walls, and the angle F between the first side wall (321) and the horizontal plane is 60-65 degrees; the angle G between the first side wall (321) and the horizontal plane is 75-80 degrees, and the third side wall (331) is perpendicular to the horizontal plane.

2. A coke oven denitrification process according to claim 1, characterized in that: The denitration nozzle (2) is in the shape of a truncated cone with a large cross-sectional area at the inlet end and a small cross-sectional area at the outlet end.

3. A coke oven denitrification process according to claim 1, characterized in that: On both sides of the midpoint of the denitrification pipe (1), the directions (D) of the small ends of the second frustum section (33) are opposite.

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