A denitration device of sintering flue gas ultra-low temperature SCR catalyst

Abstract

The present application relates to the technical field of flue gas treatment, comprising a box, a fixed cavity is formed in the inside of the box, an ultralow-temperature SCR catalyst is installed in the inside of the fixed cavity, a rotating cavity is formed in the inside top end of the box, a through hole is formed through between the rotating cavity and the fixed cavity, an annular sealing block is fixedly connected to the inner wall of the rotating cavity, a rotating annular block is rotatably connected between the annular sealing block and the fixed cavity, a receiving hole is formed in the rotating annular block, specifically, it is a denitration device for sintering flue gas ultralow-temperature SCR catalyst, the flue gas after filtering dust is conveyed into the equipment, the flue gas is separated through the receiving hole, the flue gas in the receiving hole is quantitative, the ammonia gas is quantitatively sprayed by the air injection head, the quantitative flue gas is pushed into the fixed cavity by the ammonia gas, and the flue gas is fully mixed with the ammonia gas in proportion in the process of pushing, so that the subsequent SCR catalyst reaction is facilitated, and the flue gas is avoided from being discharged without reaction.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, specifically to a denitrification device for sintered flue gas using an ultra-low temperature SCR catalyst. Background Technology

[0002] In the process of rapid industrial development, environmental problems caused by energy consumption and pollutant emissions have become increasingly prominent, among which nitrogen oxides (NOx) are particularly serious. X NO, as one of the major air pollutants, is not only a significant contributor to acid rain and photochemical smog, but also poses serious threats to human health and the ecological environment. The steel industry, as a pillar industry of the national economy, generates NO through sintering flue gas during its production process. X One of the main sources of emissions.

[0003] Under the action of ultra-low temperature SCR catalyst, ammonia reacts with nitrogen oxides in flue gas in a selective catalytic reduction reaction to generate nitrogen and water to treat the flue gas.

[0004] Existing equipment typically mixes and transports flue gas and ammonia in the flue. However, the ammonia cannot cover the flue when it is transported, causing some flue gas to pass through the flue and enter the catalytic chamber unmixed. Consequently, some flue gas is carried out before the catalytic reduction reaction is completed. Therefore, it is necessary to propose a denitrification device for sintered flue gas using an ultra-low temperature SCR catalyst. Summary of the Invention

[0005] To address the problems in the prior art, the present invention provides a denitrification device for ultra-low temperature SCR catalysts in sintering flue gas.

[0006] The technical solution adopted by this invention to solve its technical problem is: a denitrification device for ultra-low temperature SCR catalyst in sintering flue gas, comprising a housing, a fixed cavity inside the housing, an SCR catalyst installed inside the fixed cavity, a rotating cavity at the top of the housing, a through hole between the rotating cavity and the fixed cavity, an annular sealing block fixedly connected to the inner wall of the rotating cavity, a rotating annular block rotatably connected to the annular sealing block and the rotating cavity, a receiving hole on the rotating annular block, an air inlet pipe fixedly installed on the inner wall of the annular sealing block, an installation groove at the lower end of the annular sealing block, an air jet fixedly installed in the installation groove, a connecting cavity inside the housing, a conveying hole through the connecting cavity and the rotating cavity, and an air inlet hole through the connecting cavity and the outer wall of the housing. A drive assembly is shared on the annular sealing block and the rotating annular block.

[0007] Specifically, the drive assembly includes a motor, which is fixedly mounted on an annular sealing block. A gear is fixedly mounted on the output end of the motor via a coupling. A toothed groove is formed on the inner wall of the rotating annular block, and the gear meshes with the toothed groove.

[0008] Specifically, the lower end wall of the fixed cavity is funnel-shaped, and a discharge pipe is fixedly installed at the center of the lower end wall of the fixed cavity, with the lower end of the discharge pipe extending through to the outside of the box.

[0009] Specifically, the outer wall of the rotating annular block abuts against the cavity wall of the rotating cavity, and the inner wall of the rotating annular block abuts against the outer wall of the annular sealing block.

[0010] Specifically, the length of the rotating annular block is longer than the length of the annular sealing block.

[0011] Specifically, the air intake pipe is positioned directly above the mounting slot, and the jet nozzle is connected to the air intake pipe.

[0012] Specifically, the jet head is positioned directly above the through hole, and the positions of the jet head and the conveying hole correspond to the positions of the receiving hole.

[0013] The beneficial effects of the present invention are as follows: In the denitrification device for ultra-low temperature SCR catalyst of sintering flue gas, the present invention first starts the drive component to drive the rotating annular block to rotate, and then the flue gas after filtering the dust is transported to the connecting cavity. When the receiving hole on the rotating annular block coincides with the conveying hole, the flue gas will enter. When the receiving hole coincides with the jet head, the jet head will spray ammonia gas, and the flue gas in the receiving hole will be pushed into the fixed cavity by the ammonia gas. During the pushing process, the flue gas will be fully mixed with the ammonia gas, and the mixed flue gas will react with the SCR catalyst, thus avoiding the discharge of flue gas without reaction. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 A schematic diagram of the external structure of a denitrification device for an ultra-low temperature SCR catalyst in sintering flue gas provided by the present invention;

[0016] Figure 2 This is a front internal sectional view of a denitrification device for an ultra-low temperature SCR catalyst in sintering flue gas provided by the present invention.

[0017] Figure 3 This is a top internal cross-sectional view of a denitrification device for an ultra-low temperature SCR catalyst in sintering flue gas provided by the present invention.

[0018] Figure 4A front view schematic diagram of the connection structure between the annular sealing block and the rotating annular block of a denitrification device for an ultra-low temperature SCR catalyst in sintering flue gas provided by the present invention.

[0019] Figure 5 A schematic diagram of the rear view connection structure between the annular sealing block and the rotating annular block of a denitrification device for an ultra-low temperature SCR catalyst in sintering flue gas provided by the present invention.

[0020] Figure 6 A schematic diagram of the annular sealing block structure of a denitrification device for an ultra-low temperature SCR catalyst in sintering flue gas provided by the present invention;

[0021] Figure 7 This is a schematic diagram of the rotating annular block structure of a denitrification device for an ultra-low temperature SCR catalyst in sintering flue gas provided by the present invention.

[0022] In the diagram: 1. Housing; 2. Fixed cavity; 3. SCR catalyst; 4. Rotating cavity; 5. Through hole; 6. Annular sealing block; 7. Rotating annular block; 8. Storage hole; 9. Air inlet pipe; 10. Mounting groove; 11. Jet nozzle; 12. Connecting cavity; 13. Conveying hole; 14. Air inlet; 15. Motor; 16. Gear; 17. Gear groove; 18. Discharge pipe. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] like Figures 1-7 As shown, the present invention provides the following technical solution:

[0025] Example 1: A denitrification device for an ultra-low temperature SCR catalyst in sintering flue gas includes a housing 1. A fixed cavity 2 is formed inside the housing 1, and an SCR catalyst 3 is installed inside the fixed cavity 2. A rotating cavity 4 is formed at the top of the housing 1. A through hole 5 is formed between the rotating cavity 4 and the fixed cavity 2. An annular sealing block 6 is fixedly connected to the inner wall of the rotating cavity 4. A rotating annular block 7 is rotatably connected between the annular sealing block 6 and the rotating cavity 4. A receiving hole 8 is formed on the rotating annular block 7. An air inlet pipe 9 is fixedly installed on the inner wall of the annular sealing block 6. An installation groove 10 is formed at the lower end of the annular sealing block 6. An air jet head 11 is fixedly installed in the installation groove 10. A connecting cavity 12 is formed on the inner wall of the housing 1. A conveying hole 13 is formed between the connecting cavity 12 and the rotating cavity 4. An air inlet hole 14 is formed between the connecting cavity 12 and the outer wall of the housing 1. A drive assembly is jointly provided on the annular sealing block 6 and the rotating annular block 7.

[0026] The drive assembly includes a motor 15, which is fixedly mounted on an annular sealing block 6. A gear 16 is fixedly mounted on the output end of the motor 15 via a coupling. A toothed groove 17 is provided on the inner wall of the rotating annular block 7, and the gear 16 meshes with the toothed groove 17.

[0027] The lower end wall of the fixed cavity 2 is funnel-shaped, and a discharge pipe 18 is fixedly installed at the center of the lower end wall of the fixed cavity 2. The lower end of the discharge pipe 18 extends through to the outside of the box body 1.

[0028] When using it, the following steps are included;

[0029] First, start the motor 15 to rotate at a constant speed. The motor 15 will drive the gear 16 to rotate. The gear 16 can drive the rotating ring block 7 to rotate by meshing with the tooth groove 17. Under the limitation of the rotating cavity 4, the rotating ring block 7 can only rotate in its original position. The rotating ring block 7 will drive the storage hole 8 to move. The cavity wall of the rotating cavity 4 and the annular sealing block 6 will seal the opening of the storage hole 8.

[0030] The second step involves injecting the filtered flue gas (at a temperature between 120°C and 160°C) into the connecting cavity 12 through the air inlet 14. The flue gas in the connecting cavity 12 then enters the conveying hole 13. When the receiving hole 8 coincides with the conveying hole 13, the flue gas enters the receiving hole 8 and fills it. Due to the volume limitation of the receiving hole 8, the amount of flue gas injected into the filled receiving hole 8 is quantitative.

[0031] Third, rotating the ring block 7 will cause the receiving hole 8 to move continuously, so that the receiving hole 8 containing flue gas moves to connect with the through hole 5 and the mounting groove 10. At this time, the jet head 11 will continuously and quantitatively spray ammonia gas. During the movement of the receiving hole 8, all positions of the receiving hole 8 will pass under the jet head 11, so that the sprayed ammonia gas will push the flue gas through the through hole 5 into the fixed cavity 2, and the sprayed ammonia gas will be fully mixed with the pushed flue gas in proportion.

[0032] In the fourth step, the motor 15 drives the rotating annular block 7 to rotate at a constant speed, causing the rotating annular block 7 to inject ammonia and flue gas into the fixed cavity 2 at a constant speed. The quantitatively injected ammonia gas will fully contact the flue gas and the SCR catalyst 3. (When the mixed ammonia gas and flue gas pass through the catalyst bed, under the action of the catalyst active sites, NH3 and NO...) X A redox reaction occurs, and the main reaction equation is: and The active components of ultra-low temperature catalysts (such as MnO) X(e.g., CeO2) reduces the activation energy of the reaction by providing reactive sites, ensuring efficient reaction under low temperature conditions. Ammonia undergoes selective catalytic reduction of nitrogen oxides in flue gas to produce nitrogen and water, which are then discharged to subsequent treatment processes through discharge pipe 18.

[0033] Example 2: The technical solutions in this example that differ from Example 1 include:

[0034] The outer wall of the rotating annular block 7 abuts against the cavity wall of the rotating cavity 4, and the inner wall of the rotating annular block 7 abuts against the outer wall of the annular sealing block 6, so that the hole on the receiving hole 8 will be in a closed state when it is not connected to the conveying hole 13, the through hole 5 and the mounting groove 10, thus preventing the leakage of flue gas. The length of the rotating annular block 7 is longer than the length of the annular sealing block 6. The tooth groove 17 is located at the end of the rotating annular block 7 that extends to the outside of the annular sealing block 6, so that the gear 16 can mesh with the tooth groove 17. The air inlet pipe 9 is set directly above the mounting groove 10, and the jet head 11 is connected to the air inlet pipe 9. The jet head 11 is set directly above the through hole 5, and the positions of the jet head 11 and the conveying hole 13 are corresponding to the positions of the receiving hole 8. Ammonia gas is injected into the jet head 11 through the air inlet pipe 9, and ammonia gas is sprayed into the receiving hole 8 through the jet head 11.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A denitrification device for an ultra-low temperature SCR catalyst in sintering flue gas, comprising a housing (1), wherein a fixed cavity (2) is provided inside the housing (1), and an SCR catalyst (3) is installed inside the fixed cavity (2), characterized in that, The top of the box (1) is provided with a rotating cavity (4), and a through hole (5) is provided between the rotating cavity (4) and the fixed cavity (2). An annular sealing block (6) is fixedly connected to the inner wall of the rotating cavity (4). A rotating annular block (7) is rotatably connected between the annular sealing block (6) and the rotating cavity (4). A receiving hole (8) is provided on the rotating annular block (7). An air inlet pipe (9) is fixedly installed on the inner wall of the annular sealing block (6). An installation groove (10) is provided at the lower end of the annular sealing block (6). An air jet head (11) is fixedly installed in the installation groove (10). A connecting cavity (12) is provided on the inner wall of the box (1). A conveying hole (13) is provided between the connecting cavity (12) and the rotating cavity (4). An air inlet hole (14) is provided between the connecting cavity (12) and the outer wall of the box (1). A drive assembly is provided on both the annular sealing block (6) and the rotating annular block (7). The drive assembly includes a motor (15), which is fixedly mounted on an annular sealing block (6). A gear (16) is fixedly mounted on the output end of the motor (15) via a coupling. A toothed groove (17) is provided on the inner wall of the rotating annular block (7), and the gear (16) meshes with the toothed groove (17). The outer wall of the rotating annular block (7) abuts against the cavity wall of the rotating cavity (4), and the inner wall of the rotating annular block (7) abuts against the outer wall of the annular sealing block (6); The air intake pipe (9) is positioned directly above the mounting slot (10), and the jet head (11) is connected to the air intake pipe (9); The jet head (11) is positioned directly above the through hole (5), and the positions of the jet head (11) and the conveying hole (13) correspond to the positions of the receiving hole (8).

2. The denitrification device for sintering flue gas ultra-low temperature SCR catalyst according to claim 1, characterized in that: The lower end of the fixed cavity (2) is funnel-shaped, and a discharge pipe (18) is fixedly installed at the center of the lower end of the fixed cavity (2). The lower end of the discharge pipe (18) extends through to the outside of the box body (1).

3. The denitrification device for sintering flue gas ultra-low temperature SCR catalyst according to claim 1, characterized in that: The length of the rotating annular block (7) is longer than the length of the annular sealing block (6).

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