SCR (Selective Catalytic Reduction) denitration equipment for sintering flue gas

Abstract

The utility model discloses SCR (Selective Catalytic Reduction) denitration equipment for sintering flue gas, which is characterized in that a denitration tower body is communicated with the top of an L-shaped flue through a connecting flue, a denitration reactor is arranged in the denitration tower body, and a rectifying mechanism is arranged in the denitration tower body and above the denitration reactor; an exhaust port is formed in the bottom of the denitration tower body, a mixing mechanism is arranged at the upper part in the L-shaped flue, a rectifying mechanism is arranged in the denitration tower body, and a guide plate swings, so that gas can generate a relatively stable wavy flowing direction after passing through the rectifying mechanism, and the pressure of the gas entering a denitration reactor is increased; the efficiency of the flue gas entering the denitration reactor is improved, so that the flue gas denitration efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of denitration equipment, in particular to an SCR denitration equipment for sintering flue gas. Background Art

[0002] Sintering flue gas is waste gas generated during the steel production process, which often contains certain corrosive gases such as sulfur dioxide and nitrogen oxides. The existing sintering flue gas mainly adopts the "selective catalytic reduction (SCR) process" for denitrification treatment. This is a denitrification process that uses a reducing agent to react chemically with nitrogen oxides in the flue gas under the action of a catalyst to generate nitrogen and water.

[0003] After searching, a Chinese invention with publication number CN108786445B discloses an SCR denitrification device. Currently, uniform mixing of flue gas and ammonia to make them homogeneous is a key link in the SCR denitrification process. This process requires that the flue gas needs to fully contact and react with ammonia before entering the device to obtain higher denitrification efficiency. Therefore, the uniformity of the mixing of flue gas and ammonia will directly affect the denitrification efficiency.

[0004] However, the existing SCR denitrification equipment mainly increases the contact time between the flue gas and ammonia during transportation by lengthening the flue, and adopts a matrix of baffles with different angles as a mixing device. After the flue gas and ammonia pass through the mixing device, the gas is turbulent, thereby disrupting the gas flow stability to achieve the purpose of mixing the flue gas and ammonia. However, this mixing device will produce a certain resistance to the gas, reducing the flow speed of the gas in the flue. At the same time, after the flue gas passes through the mixing device, the gas flow direction will be disordered, so the flue gas and ammonia cannot smoothly enter the reactor and react with the catalyst, thereby directly reducing the denitrification efficiency of the flue gas. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide an SCR denitrification device for sintering flue gas in view of the deficiencies in the prior art, so as to solve at least one of the above technical problems.

[0006] The technical solution of the utility model for solving the above-mentioned technical problems is as follows: An SCR denitrification equipment for sintering flue gas comprises a denitrification tower body, an L-shaped flue is provided on one side of the denitrification tower body, the denitrification tower body and the top of the L-shaped flue are connected by a connecting flue, a denitrification reactor is provided in the denitrification tower body, a rectifier mechanism is provided inside the denitrification tower body and the rectifier mechanism is provided above the denitrification reactor, an exhaust port is provided at the bottom of the denitrification tower body, a mixing mechanism is provided at the upper part of the L-shaped flue, an air inlet port is provided at the end of the L-shaped flue, a drive motor is provided on one side of the denitrification tower body, and the drive motor is transmission-connected to the rectifier mechanism and the mixing mechanism.

[0007] Furthermore, the rectification mechanism includes a reciprocating screw and a guide plate. The reciprocating screw is arranged inside the denitrification tower body through a bearing. The reciprocating screw is connected to the drive motor through a transmission connection. The reciprocating screw is connected to a number of screw sleeves through a reciprocating thread. Limiting plates are provided on both sides of the screw sleeve. The upper and lower sides of the screw sleeve are connected to the guide plate through a connecting hinge. The ends of the several guide plates are connected through a connecting rod. Slide grooves are provided on both sides of the interior of the denitrification tower body, and the two ends of the connecting rod are respectively slidably connected to the slide grooves on both sides.

[0008] Furthermore, the mixing mechanism includes several ammonia injection pipes, a connecting cavity is provided on one side of the side wall of the L-shaped flue, and the several ammonia injection pipes are connected to the connecting cavity. An air pump is provided on the side wall of the L-shaped flue, and the air pump is connected to an ammonia delivery pipeline. The ammonia delivery pipeline is connected to the connecting cavity and the ammonia delivery pipeline is provided with a control pipe valve.

[0009] Furthermore, a gear cavity is provided on the inner side of the side wall of the L-shaped flue, the ammonia injection pipe is connected to the gear cavity through a bearing, the air inlet end of the ammonia injection pipe is connected to the connecting cavity, a small gear is provided at the end of the ammonia injection pipe and the small gear is provided in the gear cavity, a slide cavity is provided above the gear cavity, a sliding plate is slidingly provided in the slide cavity, the two sides of the sliding plate are connected to the two sides of the slide cavity through a return spring, a sliding rack is provided at the bottom of the sliding plate, the sliding rack is transmission-connected to the small gear, a cam groove is provided in the middle of the sliding plate, an eccentric cam is provided in the cam groove, and the eccentric cam is transmission-connected to the drive motor through a rotating shaft.

[0010] Furthermore, a gear seat is provided above the ammonia injection pipe, a trumpet-shaped guide funnel is provided above the gear seat, a fixed frame cover is provided at the upper opening of the guide funnel, a turbulent fan is provided in the fixed frame cover, the rotating shaft is provided in the gear seat, a second bevel gear is provided in the middle of the rotating shaft, a vertical connecting shaft is provided above the gear seat, a first bevel gear is provided at the lower end of the connecting shaft, the first bevel gear is transmission-connected to the second bevel gear, and the upper end of the connecting shaft is transmission-connected to the turbulent fan.

[0011] Furthermore, a plurality of second curved plates are provided at the bottom corners of the L-shaped flue, and a plurality of first curved plates are provided at the top corners of the L-shaped flue.

[0012] Furthermore, there are several denitrification reactors.

[0013] Furthermore, an inspection door is provided on one side of the denitration tower body and the inspection door is provided corresponding to the denitration reactor.

[0014] The beneficial effects of the utility model are:

[0015] 1. By installing a mixing mechanism inside the L-shaped flue, the ammonia injection pipe swings left and right, thereby increasing the ammonia spray range and allowing ammonia to contact the flue gas more evenly. The ammonia and flue gas are concentrated and flowed into the fixed frame cover through the diversion funnel, and the ammonia and flue gas passing through the fixed frame cover are stirred and turbulent by the turbulent fan, thereby improving the mixing efficiency of the ammonia and flue gas. At the same time, the rotating turbulent fan can provide assistance to the gas, making it easier to blow the gas into the denitrification tower body, reducing the length requirement of the flue, improving the mixing efficiency of the ammonia and flue gas, and thus improving the efficiency of denitrification.

[0016] 2. By setting a rectifying mechanism inside the denitrification tower body, the guide plate swings so that the gas can produce a relatively stable wave-shaped flow direction after passing through the rectifying mechanism, thereby increasing the pressure of the gas entering the denitrification reactor, improving the efficiency of the flue gas entering the denitrification reactor, and thus improving the flue gas denitrification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the rectifying mechanism and the mixing mechanism of the present invention;

[0020] Figure 4 It is a schematic structural diagram of the mixing mechanism of the present invention;

[0021] Figure 5 It is a schematic diagram of the local structure of the mixing mechanism of the present invention;

[0022] Figure 6 This invention Figure 2 A magnified view of point A in the figure;

[0023] Figure 7 This invention Figure 3 Enlarged view of point B in .

[0024] Reference numerals: 1, denitrification tower body; 2, L-shaped flue; 3, connecting flue; 4, driving motor; 5, denitrification reactor; 6, rectifier mechanism; 601, reciprocating screw; 602, slide; 603, connecting rod; 604, screw sleeve; 605, guide plate; 606, connecting hinge; 7, mixing mechanism; 701, gear seat; 702, rotating shaft; 703, connecting shaft; 704, first bevel gear; 705, second bevel gear; 706, fixed Fixed frame cover; 707, guide funnel; 708, spoiler fan; 709, eccentric cam; 710, sliding plate; 711, ammonia injection pipe; 712, pinion; 713, cam groove; 714, sliding rack; 8, air pump; 9, ammonia delivery pipeline; 10, connecting cavity; 11, control pipe valve; 12, limit plate; 13, air inlet port; 14, exhaust port; 15, inspection door; 16, first arc plate; 17, second arc plate; 18, return spring. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and that these equivalent forms also fall within the scope defined by the appended claims.

[0026] See also Figures 1 to 7 It is a schematic diagram of the various structures of the present invention, including a denitrification tower body 1, an L-shaped flue 2 is provided on one side of the denitrification tower body 1, the top of the denitrification tower body 1 and the L-shaped flue 2 are connected by a connecting flue 3, a denitrification reactor 5 is provided in the denitrification tower body 1, a rectifier mechanism 6 is provided inside the denitrification tower body 1 and the rectifier mechanism 6 is provided above the denitrification reactor 5, an exhaust port 14 is provided at the bottom of the denitrification tower body 1, a mixing mechanism 7 is provided at the upper part of the L-shaped flue 2, an air inlet port 13 is provided at the end of the L-shaped flue 2, and a drive motor 4 is provided on one side of the denitrification tower body 1, and the drive motor 4 is transmission-connected to the rectifier mechanism 6 and the mixing mechanism 7.

[0027] Embodiment 1: Specifically, the rectifier mechanism 6 includes a reciprocating screw 601 and a guide plate 605. The reciprocating screw 601 is arranged inside the denitrification tower body 1 through a bearing. The reciprocating screw 601 is connected to the drive motor 4 for transmission. The reciprocating screw 601 is connected to a number of screw sleeves 604 through a reciprocating thread. Limiting plates 12 are provided on both sides of the screw sleeve 604. The screw sleeve 604 changes direction and moves in the opposite direction when it hits the limit plate 12. The upper and lower sides of the screw sleeve 604 are connected to the guide plate 605 through a connecting hinge 606. The ends of the guide plates 605 are connected through a connecting rod 603. Slide grooves 602 are provided on both sides of the interior of the denitrification tower body 1. The two ends of the connecting rod 603 are respectively slidably connected to the slide grooves 602 on both sides. The screw sleeve 604 drives the guide plate 605 to swing when moving. While swinging, the connecting rod 603 reciprocates up and down, which can generate a relatively stable wave-shaped flow. This increases the pressure of the flue gas when it enters the reactor, thereby improving the flue gas denitrification efficiency.

[0028] Specifically, a plurality of second curved plates 17 are provided at the bottom corners of the L-shaped flue 2, and a plurality of first curved plates 16 are provided at the top corners of the L-shaped flue 2 for guiding the gas and further reducing the resistance during gas flow.

[0029] Specifically, there are several denitrification reactors 5, and the denitrification catalyst inside the denitrification reactor 5 adopts a titanium-based catalyst with titanium dioxide as the main carrier and vanadium pentoxide as the main active ingredient. The multi-layer denitrification reactor 5 can effectively improve the denitrification effect of the flue gas and improve the flue gas denitrification rate.

[0030] Specifically, an inspection door 15 is provided on one side of the denitration tower body 1 and the inspection door 15 is provided corresponding to the denitration reactor 5 . The interior of the denitration tower body 1 can be opened through the inspection door 15 , thereby facilitating replacement of the catalyst inside the denitration reactor 5 .

[0031] When using the present invention, the flue gas enters from the air inlet port 13, and the reciprocating screw 601 is driven to rotate inside the denitrification tower body 1 by turning on the drive motor 4. The reciprocating screw 601 is threadedly engaged with the screw sleeve 604 respectively, and the screw sleeve 604 is limited by the limiting plate 12 so that the screw sleeve 604 slides back and forth on the reciprocating screw 601 respectively, and the guide plate 605 swings back and forth, so as to guide the gas, so that when the gas passes through the guide plate 605, the turbulent gas can be rectified into a more stable wave shape for flow, thereby increasing the pressure of the gas entering the denitrification reactor 5, improving the efficiency of the flue gas entering the denitrification reactor 5, and thereby improving the flue gas denitrification efficiency. The flue gas after denitrification is discharged from the exhaust port 14.

[0032] Embodiment 2: Specifically, the mixing mechanism 7 includes a plurality of ammonia injection pipes 711, a connecting cavity 10 is provided on one side of the side wall of the L-shaped flue 2, and the plurality of ammonia injection pipes 711 are all connected to the connecting cavity 10. An air pump 8 is provided on the side wall of the L-shaped flue 2, and the air pump 8 is connected to an ammonia delivery pipeline 9. The ammonia delivery pipeline 9 is connected to the connecting cavity 10 and the ammonia delivery pipeline 9 is provided with a control pipe valve 11. By turning on the air pump 8, ammonia is transported to the inside of the connecting cavity 10 through the ammonia delivery pipeline 9 and the control pipe valve 11, so that ammonia can be injected into the inside of the L-shaped flue 2 through the ammonia injection pipe 711 and mixed with the flue gas.

[0033] Specifically, a gear cavity is provided on the inner side of the side wall of the L-shaped flue 2, an ammonia injection pipe 711 is connected to the gear cavity through a bearing, an air inlet end of the ammonia injection pipe 711 is connected to the communication cavity 10, a pinion 712 is provided at the end of the ammonia injection pipe 711 and the pinion 712 is provided in the gear cavity, a slide cavity is provided above the gear cavity, a sliding plate 710 is slidably provided in the slide cavity, both sides of the sliding plate 710 are connected to both sides of the slide cavity by a return spring 18, a sliding rack 714 is provided at the bottom of the sliding plate 710, and the sliding rack 714 is connected to the pinion 71 2 transmission connection, the reciprocating motion of the sliding rack 714 drives the ammonia injection pipe 711 to reciprocate, a cam groove 713 is provided in the middle of the sliding plate 710, an eccentric cam 709 is provided in the cam groove 713, the eccentric cam 709 is connected to the drive motor 4 through the rotating shaft 702, and the rotating shaft 702 is connected to the reciprocating screw 601. The outlet ends of the plurality of ammonia injection pipes 711 are arranged alternately at multiple levels to improve the mixing effect. The drive motor 4 drives the ammonia injection pipe 711 to swing left and right, thereby increasing the ammonia spraying range and ensuring more uniform contact between the ammonia and the flue gas.

[0034] Specifically, a gear seat 701 is provided above the ammonia injection pipe 711, and a trumpet-shaped guide funnel 707 is provided above the gear seat 701. A fixed frame cover 706 is provided at the upper opening of the guide funnel 707, and a turbulence fan 708 is provided in the fixed frame cover 706. The rotating shaft 702 is provided in the gear seat 701, and a second bevel gear 705 is provided in the middle of the rotating shaft 702. A vertical connecting shaft 703 is provided above the gear seat 701, and a first bevel gear 704 is provided at the lower end of the connecting shaft 703. The first bevel gear 704 is transmission-connected to the second bevel gear 705, and the upper end of the connecting shaft 703 is transmission-connected to the turbulence fan 708, so as to stir and turbulently stir the ammonia and flue gas passing through the inside of the guide funnel 707, thereby improving the mixing efficiency of the ammonia and flue gas. At the same time, the rotating turbulence fan 708 can provide assistance to the gas, thereby facilitating the blowing of the gas to flow into the interior of the denitrification tower body 1.

[0035] When using the present invention, when the reciprocating screw rod 601 is driven to rotate by the driving motor 4, the rotating shaft 702 is synchronously driven to rotate, so that the rotating shaft 702 can drive the eccentric cam 709 to rotate inside the cam groove 713, thereby pushing the sliding plate 710 to slide back and forth inside the slide cavity, causing the sliding rack 714 to slide and mesh with the pinion 712, and then drive the ammonia injection pipe 711 to swing left and right to spray ammonia, thereby increasing the contact range of ammonia and flue gas, and then the ammonia and flue gas are guided through the diversion funnel 707, so that the ammonia and flue gas are concentrated into the interior of the diversion funnel 707, and the second bevel gear 705 is driven by the rotation of the rotating shaft 702 to mesh with the first bevel gear 704, thereby driving the connecting shaft 703 to rotate, so that the connecting shaft 703 can drive the turbulence fan 708 to rotate inside the fixed frame cover 706, turbulently mixing the incoming ammonia and flue gas, and at the same time, it can also provide assistance to the airflow, thereby increasing the airflow velocity.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An SCR denitrification device for sintering flue gas, comprising a denitrification tower (1), characterized in that: An L-shaped flue (2) is provided on one side of the denitration tower body (1), and the tops of the denitration tower body (1) and the L-shaped flue (2) are connected via a connecting flue (3). A denitration reactor (5) is provided in the denitration tower body (1), and a rectifying mechanism (6) is provided inside the denitration tower body (1), and the rectifying mechanism (6) is provided above the denitration reactor (5). An exhaust port (14) is provided at the bottom of the denitration tower body (1), and a mixing mechanism (7) is provided at the upper part of the L-shaped flue (2). An air inlet port (13) is provided at the end of the L-shaped flue (2). A drive motor (4) is provided on one side of the denitration tower body (1), and the drive motor (4) is connected to the rectifying mechanism (6) and the mixing mechanism (7) in a transmission manner.

2. The SCR denitrification equipment for sintering flue gas according to claim 1, characterized in that: The rectifying mechanism (6) comprises a reciprocating screw (601) and a guide plate (605). The reciprocating screw (601) is arranged inside the denitrification tower body (1) through a bearing. The reciprocating screw (601) is connected to a driving motor (4) in a transmission manner. The reciprocating screw (601) is connected to a plurality of screw sleeves (604) through a reciprocating thread. Both sides of the screw sleeve (604) are provided with a limit plate (12). The upper and lower sides of the screw sleeve (604) are connected to the guide plates (605) through a connecting hinge (606). The ends of the plurality of guide plates (605) are connected through a connecting rod (603). Slide grooves (602) are provided on both sides of the interior of the denitrification tower body (1). The two ends of the connecting rod (603) are respectively slidably connected to the slide grooves (602) on both sides.

3. The SCR denitrification equipment for sintering flue gas according to claim 1, characterized in that: The mixing mechanism (7) includes a plurality of ammonia injection pipes (711), a connecting cavity (10) is provided on one side of the side wall of the L-shaped flue (2), and the plurality of ammonia injection pipes (711) are all connected to the connecting cavity (10), an air pump (8) is provided on the side wall of the L-shaped flue (2), the air pump (8) is connected to an ammonia delivery pipeline (9), the ammonia delivery pipeline (9) is connected to the connecting cavity (10), and the ammonia delivery pipeline (9) is provided with a control pipe valve (11).

4. The SCR denitrification equipment for sintering flue gas according to claim 3, characterized in that: A gear cavity is provided on the inner side of the side wall of the L-shaped flue (2); the ammonia injection pipe (711) is connected to the gear cavity via a bearing; the air inlet end of the ammonia injection pipe (711) is connected to the communication cavity (10); a small gear (712) is provided at the end of the ammonia injection pipe (711), and the small gear (712) is provided in the gear cavity; a slide cavity is provided above the gear cavity; a sliding plate (710) is slidably provided in the slide cavity; both sides of the sliding plate (710) are connected to both sides of the slide cavity via a return spring (18); a sliding rack (714) is provided at the bottom of the sliding plate (710); the sliding rack (714) is transmission-connected to the small gear (712); a cam groove (713) is provided in the middle of the sliding plate (710); an eccentric cam (709) is provided in the cam groove (713); the eccentric cam (709) is transmission-connected to the drive motor (4) via a rotating shaft (702).

5. The SCR denitrification equipment for sintering flue gas according to claim 4, characterized in that: A gear seat (701) is provided above the ammonia injection pipe (711), a trumpet-shaped guide funnel (707) is provided above the gear seat (701), a fixed frame cover (706) is provided at the upper opening of the guide funnel (707), a turbulence fan (708) is provided in the fixed frame cover (706), the rotating shaft (702) is provided in the gear seat (701), a second bevel gear (705) is provided in the middle of the rotating shaft (702), a vertical connecting shaft (703) is provided above the gear seat (701), a first bevel gear (704) is provided at the lower end of the connecting shaft (703), the first bevel gear (704) is transmission-connected to the second bevel gear (705), and the upper end of the connecting shaft (703) is transmission-connected to the turbulence fan (708).

6. The SCR denitrification equipment for sintering flue gas according to claim 1, characterized in that: A plurality of second curved plates (17) are provided at the inner bottom corners of the L-shaped flue (2), and a plurality of first curved plates (16) are provided at the inner top corners of the L-shaped flue (2).

7. The SCR denitrification equipment for sintering flue gas according to claim 1, characterized in that: There are several denitrification reactors (5).

8. The SCR denitrification equipment for sintering flue gas according to claim 1, characterized in that: An inspection door (15) is provided on one side of the denitration tower body (1), and the inspection door (15) is provided corresponding to the denitration reactor (5).

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