Hot-blast stove mixing nozzle device of sintering flue gas SCR (Selective Catalytic Reduction) denitration system

Abstract

The utility model provides a hot blast stove mixing nozzle device of a sintering flue gas SCR (selective catalytic reduction) denitration system, which relates to the technical field of sintering flue gas treatment and comprises a fixed bottom plate, a reaction flue is fixedly connected to one end of the fixed bottom plate, and a circulating mechanism is mounted on one side of the reaction flue; according to the utility model, hot air is fed into the drainage pipe through the first main pipeline, the second main pipeline and the branch pipeline and is sprayed out from the first mixing nozzle and the second mixing nozzle which are arranged on the outer side of the drainage pipe, the first mixing nozzle consists of the gathering part, the middle part and the expansion part, and air in the drainage pipe flows into the gathering part under high pressure; and the gas flow passes through the middle part and then escapes from the expansion part, the speed of the gas flow is changed along with the change of the spray sectional area, and thrust is generated to spray the gas flow, so that the flue gas is fully mixed with the gas flow sprayed by the first mixing nozzle and the second mixing nozzle, the flue gas is conveniently and uniformly heated, and the influence on the denitration reaction is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sintering flue gas treatment, in particular to a hot blast furnace mixing nozzle device of a sintering flue gas SCR denitration system. Background Art

[0002] The sintering process is an important link in steel production, but it will produce a large amount of flue gas containing various pollutants. SCR denitrification technology is used to treat sintering flue gas. The original temperature of sintering flue gas is usually low. By mixing high-temperature hot air with the sintering flue gas in a mixing nozzle device, the flue gas temperature is increased to meet the temperature requirements of the SCR reaction.

[0003] In the prior art, the temperature of the sintering flue gas is increased inside the mixing nozzle device, the hot air and the sintering flue gas cannot be fully mixed, and the sintering flue gas temperature is unevenly heated, which will cause local temperature deficiency, resulting in abnormal SCR denitrification reaction, and the SCR denitrification reaction cannot be fully carried out, affecting the effect of flue gas treatment. Utility Model Content

[0004] The utility model mainly provides a hot blast furnace mixing nozzle device of a sintering flue gas SCR denitration system, which can evenly increase the reaction temperature and prevent the occurrence of insufficient temperature.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a hot blast furnace mixing nozzle device of a sintering flue gas SCR denitrification system, comprising: a fixed base plate, one end of the fixed base plate is fixedly connected to a reaction flue, a circulation mechanism is installed on one side of the reaction flue, a mixing mechanism is installed inside the reaction flue, the mixing mechanism comprises branch pipes, the branch pipes are provided with multiple groups, one end of the multiple groups of branch pipes passes through one side of the fixed base plate, one end of the branch pipe is fixedly connected to a drainage pipe, one side of the drainage pipe is fixedly connected to a first mixing nozzle, one side of the drainage pipe is fixedly connected to a second mixing nozzle, the first mixing nozzle comprises a gathering part, an intermediate part and an intermediate part, one end of the gathering part is fixedly connected to the drainage pipe, the other end of the gathering part is fixedly connected to one end of the intermediate part, the intermediate part One end of the nozzle is fixedly connected with one end of the expansion part, and the hot gas is sent into the interior of the drainage pipe through the first main pipe, the second main pipe and the branch pipe, and is ejected from the first mixing nozzle and the second mixing nozzle installed on the outside of the drainage pipe. The first mixing nozzle and the second mixing nozzle are both provided with multiple, and the first mixing nozzle and the second mixing nozzle have different injection angles. The first mixing nozzle is composed of a converging part, a middle part and an expansion part. The converging part shrinks from large to small toward the middle to be consistent with the cross-section of the middle part, and the expansion part expands from small to large outward. The gas in the drainage pipe flows into the converging part under high pressure, escapes from the expansion part after passing through the middle part, and the velocity of the airflow changes due to the change of the spray cross-sectional area, generating thrust to eject the airflow, so that the flue gas is fully mixed with the airflow ejected from the first mixing nozzle and the second mixing nozzle, which facilitates uniform heating and temperature increase of the flue gas and reduces the impact on the denitrification reaction.

[0006] Preferably, one end of the branch pipe is fixedly connected to the second main pipe, and the middle part of the second main pipe is fixedly connected to the first main pipe. The first main pipe is connected to a hot air furnace, and the hot air is sent into the interior of the drainage pipe through the first main pipe, the second main pipe, and the branch pipe.

[0007] Preferably, a guide plate is fixedly connected to the interior of the reaction flue, and the passing flue gas is guided by arranging a guide plate inclined at a certain angle on one side of each group of drainage pipes.

[0008] Preferably, the circulation mechanism includes a first connecting pipe, one end of the first connecting pipe passes through one side of the fixed bottom plate and is fixedly connected to a guide cover, the outside of the first connecting pipe is fixedly connected to a fourth connecting pipe, one end of the fourth connecting pipe is fixedly connected to an electric three-way valve, one end of the electric three-way valve is fixedly connected to a second connecting pipe, and the other end of the electric three-way valve is fixedly connected to a third connecting pipe, one end of the third connecting pipe is fixedly connected to one end of the reaction flue, and the flue gas is sent into the interior of the reaction flue through the first connecting pipe, and the heated flue gas enters the interior of the third connecting pipe. When the flue gas temperature meets the standard, the flue gas is sent to the next place through the second connecting pipe. When the flue gas does not meet the standard, the third connecting pipe is connected to the fourth connecting pipe through the operation of the electric three-way valve, and the flue gas enters the first connecting pipe through the fourth connecting pipe, and returns to the interior of the reaction flue for heating again, ensuring that the flue gas undergoing denitrification reaction reaches the reaction temperature, thereby improving the flue gas denitrification reaction effect.

[0009] Preferably, a mounting bracket is fixedly connected to the outer surface of the third connecting pipe, a temperature sensor is fixedly connected to one side of the mounting bracket, a probe of the temperature sensor is inserted into the interior of the third connecting pipe, and the temperature of the passing flue gas is detected by the temperature sensor.

[0010] Preferably, the outer surface of the guide hood is fixedly connected to the inner annular surface of the reaction flue, an expansion plate is fixedly connected to the inside of the guide hood, one end of the first connecting pipe is connected to the guide hood, and a plurality of inclined expansion plates are arranged inside the guide hood to diffuse the flue gas into the interior of the fixed bottom plate.

[0011] Compared with the prior art, the advantages and positive effects of the present invention are:

[0012] 1. In the present invention, hot air is sent into the interior of the drainage pipe through the first main pipe, the second main pipe, and the branch pipe, and is ejected from the first mixing nozzle and the second mixing nozzle installed on the outside of the drainage pipe. The first mixing nozzle is composed of a converging portion, a middle portion, and an expansion portion. The gas in the drainage pipe flows into the converging portion under high pressure, passes through the middle portion, and escapes from the expansion portion. The speed of the airflow changes due to the change in the spray cross-sectional area, generating thrust to cause the airflow to be ejected, so that the flue gas is fully mixed with the airflow ejected from the first mixing nozzle and the second mixing nozzle, which facilitates uniform heating and temperature increase of the flue gas and reduces the impact on the denitration reaction.

[0013] 2. In the present invention, the flue gas is sent into the reaction flue through the first connecting pipe, and multiple inclined expansion plates diffuse the flue gas toward the interior of the fixed bottom plate. The heated flue gas enters the third connecting pipe, and the temperature of the passing flue gas is detected by a temperature sensor. The flue gas that does not meet the standard returns to the reaction flue through the fourth connecting pipe and is heated again, ensuring that the flue gas undergoing denitrification reaction reaches the reaction temperature, thereby improving the flue gas denitrification reaction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a first three-dimensional structural diagram of a hot blast furnace mixing nozzle device for a sintering flue gas SCR denitration system proposed in the utility model;

[0015] Figure 2 This is a schematic diagram of the internal cross-sectional structure of a hot blast furnace mixing nozzle device for a sintering flue gas SCR denitrification system proposed in the utility model;

[0016] Figure 3 This utility model proposes a schematic diagram of the connection structure of a mixing mechanism of a hot blast furnace mixing nozzle device in a sintering flue gas SCR denitration system;

[0017] Figure 4 This is a schematic diagram of the structure of the first mixing nozzle of a hot blast furnace mixing nozzle device of a sintering flue gas SCR denitration system proposed in the utility model;

[0018] Figure 5 This is a second three-dimensional structural schematic diagram of a hot blast furnace mixing nozzle device of a sintering flue gas SCR denitrification system proposed by the utility model.

[0019] Legend: 1. Fixed bottom plate; 2. Reaction flue; 3. Mixing mechanism; 31. First main pipeline; 32. Second main pipeline; 33. Branch pipeline; 34. Drainage pipe; 35. First mixing nozzle; 351. Converging part; 352. Middle part; 353. Expansion part; 36. Second mixing nozzle; 37. Guide plate; 4. Circulation mechanism; 41. First connecting pipe; 42. Expansion plate; 43. Guide cover; 44. Mounting bracket; 45. Temperature sensor; 46. Electric three-way valve; 47. Second connecting pipe; 48. Third connecting pipe; 49. Fourth connecting pipe. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] See also Figure 1 - Figure 5The utility model provides a technical solution: a hot blast furnace mixing nozzle device of a sintering flue gas SCR denitrification system, comprising: a fixed base plate 1, one end of the fixed base plate 1 is fixedly connected to a reaction flue 2, a circulation mechanism 4 is installed on one side of the reaction flue 2, a mixing mechanism 3 is installed inside the reaction flue 2, the mixing mechanism 3 comprises a branch pipe 33, the branch pipe 33 is provided with multiple groups, one end of the multiple groups of branch pipes 33 passes through one side of the fixed base plate 1, one end of the branch pipe 33 is fixedly connected to a drainage pipe 34, one side of the drainage pipe 34 is fixedly connected to a first mixing nozzle 35, and one side of the drainage pipe 34 is fixedly connected to a second mixing nozzle 36. The first mixing nozzle 35 comprises a gathering part 351, an intermediate part 352 and an intermediate part 352, one end of the gathering part 351 is fixedly connected to the drainage pipe 34, the other end of the gathering part 351 is fixedly connected to one end of the intermediate part 352, and one end of the intermediate part 352 is fixedly connected to one end of the expansion part 353, and the hot gas is vented. The flue gas is sent into the interior of the drainage pipe 34 through the first main pipe 31, the second main pipe 32, and the branch pipe 33, and is sprayed out from the first mixing nozzle 35 and the second mixing nozzle 36 installed on the outside of the drainage pipe 34. There are multiple first mixing nozzles 35 and second mixing nozzles 36, and the first mixing nozzle 35 and the second mixing nozzle 36 have different spray angles. The first mixing nozzle 35 is composed of a converging portion 351, a middle portion 352 and an expansion portion 353. The converging portion 351 shrinks from large to small and shrinks toward the middle to be consistent with the cross-section of the middle portion 352, and the expansion portion 353 expands outward from small to large. The gas in the drainage pipe 34 flows into the converging portion 351 under high pressure, passes through the middle portion 352 and escapes from the expansion portion 353. The speed of the airflow changes due to the change in the spray cross-sectional area, generating thrust to cause the airflow to be sprayed out, so that the flue gas is fully mixed with the airflow sprayed from the first mixing nozzle 35 and the second mixing nozzle 36, which facilitates uniform heating and temperature increase of the flue gas and reduces the impact on the denitrification reaction.

[0023] like Figure 2 and Figure 3 As shown, one end of the branch pipe 33 is fixedly connected to the second main pipe 32, and the middle part of the second main pipe 32 is fixedly connected to the first main pipe 31. The first main pipe 31 is connected to the hot air furnace, and the hot air is sent into the interior of the drainage pipe 34 through the first main pipe 31, the second main pipe 32, and the branch pipe 33.

[0024] like Figure 2 and Figure 3 As shown, a guide plate 37 is fixedly connected to the interior of the reaction flue 2. By arranging a guide plate 37 inclined at a certain angle on one side of each group of drainage pipes 34, the passing flue gas is guided.

[0025] like Figure 1 and Figure 5As shown, the circulation mechanism 4 includes a first connecting pipe 41, one end of the first connecting pipe 41 passes through one side of the fixed base plate 1 and is fixedly connected to a guide cover 43, the outside of the first connecting pipe 41 is fixedly connected to a fourth connecting pipe 49, one end of the fourth connecting pipe 49 is fixedly connected to an electric three-way valve 46, one end of the electric three-way valve 46 is fixedly connected to a second connecting pipe 47, and the other end of the electric three-way valve 46 is fixedly connected to a third connecting pipe 48, one end of the third connecting pipe 48 is fixedly connected to one end of the reaction flue 2, and the flue gas is sent into the interior of the reaction flue 2 through the first connecting pipe 41, and the heated flue gas enters the interior of the third connecting pipe 48. When the flue gas temperature meets the standard, the flue gas is sent to the next place through the second connecting pipe 47. When the flue gas does not meet the standard, the electric three-way valve 46 is operated to connect the third connecting pipe 48 with the fourth connecting pipe 49, and the flue gas enters the first connecting pipe 41 through the fourth connecting pipe 49, and returns to the interior of the reaction flue 2 for heating again, ensuring that the flue gas undergoing denitrification reaction reaches the reaction temperature, thereby improving the flue gas denitrification reaction effect.

[0026] like Figure 5 As shown, the outer surface of the third connecting pipe 48 is fixedly connected to a mounting bracket 44 , and a temperature sensor 45 is fixedly connected to one side of the mounting bracket 44 . The probe of the temperature sensor 45 is inserted into the interior of the third connecting pipe 48 , and the temperature sensor 45 detects the temperature of the passing flue gas.

[0027] like Figure 5 As shown, the outer surface of the guide cover 43 is fixedly connected to the inner annular surface of the reaction flue 2, and the interior of the guide cover 43 is fixedly connected with an expansion plate 42. One end of the first connecting pipe 41 is connected to the guide cover 43, and a plurality of inclined expansion plates 42 are arranged inside the guide cover 43 to diffuse the flue gas toward the interior of the fixed bottom plate 1.

[0028] The method of use and working principle of this device are as follows: the hot air is sent into the interior of the drainage pipe 34 through the first main pipe 31, the second main pipe 32, and the branch pipe 33, and is ejected from the first mixing nozzle 35 and the second mixing nozzle 36 installed on the outside of the drainage pipe 34. The shapes and positions of the multiple groups of drainage pipes 34 are inconsistent and distributed inside the fixed bottom plate 1. The flue gas is sent into the interior of the reaction flue 2 through the first connecting pipe 41. A plurality of inclined expansion plates 42 are provided inside the guide cover 43 to diffuse the flue gas into the interior of the fixed bottom plate 1. At the same time, the guide plate 37 can guide the passing flue gas so that the flue gas is fully mixed with the airflow ejected from the first mixing nozzle 35 and the second mixing nozzle 36. The heated flue gas enters the third connecting pipe 48 and the temperature of the passing flue gas is detected by the temperature sensor 45. When the flue gas temperature meets the standard, the flue gas is sent to the next place through the second connecting pipe 47. When the flue gas does not meet the standard, the electric three-way valve 46 works to connect the third connecting pipe 48 with the fourth connecting pipe 49, and the flue gas enters the first connecting pipe 41 through the fourth connecting pipe 49 and returns to the inside of the reaction flue 2 for heating again.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A hot air furnace mixing nozzle device for a sintering flue gas SCR denitrification system, comprising a fixed base plate (1), characterized in that: One end of the fixed base plate (1) is fixedly connected to a reaction flue (2), a circulation mechanism (4) is installed on one side of the reaction flue (2), a mixing mechanism (3) is installed inside the reaction flue (2), and the mixing mechanism (3) includes a branch pipe (33), and the branch pipe (33) is provided with multiple groups, one end of each group of branch pipes (33) passes through one side of the fixed base plate (1), and one end of the branch pipe (33) is fixedly connected to a drainage pipe (34), and one side of the drainage pipe (34) is connected to the branch pipe (33). A first mixing nozzle (35) is fixedly connected, and a second mixing nozzle (36) is fixedly connected to one side of the drainage tube (34). The first mixing nozzle (35) comprises a gathering portion (351), an intermediate portion (352) and an intermediate portion (352). One end of the gathering portion (351) is fixedly connected to the drainage tube (34), the other end of the gathering portion (351) is fixedly connected to one end of the intermediate portion (352), and one end of the intermediate portion (352) is fixedly connected to one end of the expansion portion (353).

2. The hot blast furnace mixing nozzle device of the sintering flue gas SCR denitration system according to claim 1 is characterized by: One end of the branch pipe (33) is fixedly connected to the second main pipe (32), and the middle part of the second main pipe (32) is fixedly connected to the first main pipe (31). The first main pipe (31) is connected to an external hot air furnace, and hot air is sent into the interior of the drainage pipe (34) through the first main pipe (31), the second main pipe (32), and the branch pipe (33).

3. The hot blast furnace mixing nozzle device of the sintering flue gas SCR denitration system according to claim 1 is characterized by: A guide plate (37) is fixedly connected to the interior of the reaction flue (2).

4. The hot blast furnace mixing nozzle device of the sintering flue gas SCR denitration system according to claim 1 is characterized by: The circulation mechanism (4) comprises a first connecting pipe (41), one end of the first connecting pipe (41) passes through one side of the fixed base plate (1) and is fixedly connected to a guide cover (43), the outside of the first connecting pipe (41) is fixedly connected to a fourth connecting pipe (49), one end of the fourth connecting pipe (49) is fixedly connected to an electric three-way valve (46), one end of the electric three-way valve (46) is fixedly connected to a second connecting pipe (47), the other end of the electric three-way valve (46) is fixedly connected to a third connecting pipe (48), and one end of the third connecting pipe (48) is fixedly connected to one end of the reaction flue (2).

5. The hot blast furnace mixing nozzle device of the sintering flue gas SCR denitration system according to claim 4 is characterized by: The outer surface of the third connecting tube (48) is fixedly connected to a mounting bracket (44), one side of the mounting bracket (44) is fixedly connected to a temperature sensor (45), and a probe of the temperature sensor (45) is inserted into the interior of the third connecting tube (48).

6. The hot blast furnace mixing nozzle device of the sintering flue gas SCR denitration system according to claim 4 is characterized by: The outer surface of the guide cover (43) is fixedly connected to the inner annular surface of the reaction flue (2); an expansion plate (42) is fixedly connected inside the guide cover (43); and one end of the first connecting pipe (41) is connected to the guide cover (43).

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