Flue gas re-burning low nitrogen treatment system

Abstract

The present invention discloses a flue gas re-burning low-nitrogen treatment system, which relates to the technical field of flue gas treatment, and includes a recovery unit, a flue gas treatment unit and a flue gas re-burning unit. The recovery unit includes a recovery pipeline, and the recovery pipeline is connected to a chimney. The flue gas recovered by the recovery unit through the recovery pipeline is then processed by the flue gas treatment unit. The flue gas treatment unit includes a demister and a condenser. The treated flue gas enters the flue gas re-burning unit, and a flue gas incinerator is provided in the flue gas re-burning unit, and the flue gas is re-burned and nitrogen-reduced by the flue gas incinerator. The present invention draws back about 30% of the flue gas to participate in the re-burning, and the total amount of flue gas directly discharged from the chimney to the atmosphere is correspondingly reduced; the flue gas is subjected to low-nitrogen treatment by the flue gas re-burning, and the pollutant emission concentration and emission amount are reduced, and there is no problem of secondary pollution due to re-processing, and there are no other operational safety hazards, so that the investment cost of the flue gas re-burning system is low and the treatment effect is significant.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, in particular to a flue gas re-burning low-nitrogen treatment system. Background Art

[0002] Flue gas re-combustion, also known as flue gas recirculation combustion, is essentially the control of combustion temperature and oxide concentration by reintroducing the flue gas produced by combustion into the combustion area.

[0003] Under high temperature conditions, nitrogen in the air is easily oxidized to form nitrogen oxides, which is one of the main harmful components in flue gas. Flue gas reburning effectively inhibits the generation of nitrogen oxides by reducing the temperature and oxygen concentration in the combustion area. At the same time, since flue gas usually contains incompletely burned fuel components, flue gas reburning can also improve combustion efficiency and reduce energy waste. However, in order to achieve flue gas reburning operations, special equipment needs to be set up, and the structural design of the equipment needs to be scientific and reasonable. The flue gas reburning equipment in the prior art has the following problems: due to the high proportion of circulating flue gas, insufficient combustion, and the low flue gas temperature at the flue gas reflux extraction point, condensed water may enter the burner and cause corrosion. The existence of these problems has a serious negative impact on the combustion efficiency.

[0004] In order to achieve the purpose of performing efficient low-nitrification treatment on flue gas by flue gas re-burning, a flue gas re-burning low-nitrification treatment system is provided. Summary of the invention

[0005] The purpose of the present invention is to provide a flue gas re-firing low-nitrification treatment system in order to achieve the purpose of low-nitrification treatment of flue gas.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flue gas re-burning low-nitrogen treatment system, comprising a recovery unit, a flue gas treatment unit and a flue gas re-burning unit, wherein the recovery unit comprises a recovery pipeline, the recovery pipeline is connected to the chimney, the flue gas recovered by the recovery unit through the recovery pipeline is then processed by the flue gas treatment unit, the flue gas treatment unit comprises a demister and a condenser, the treated flue gas enters the flue gas re-burning unit, a flue gas incinerator is arranged in the flue gas re-burning unit, and the flue gas is re-burned to reduce nitrogen through the flue gas incinerator Processing; the flue gas incinerator includes a furnace body, one end of the top of the furnace body is fixedly connected to an exhaust pipe, the interior of the furnace body is fixedly connected to a mounting frame, the outer wall of the mounting frame is installed with a flamethrower, one end of the furnace body is fixedly connected to an air supply pipe, the outer wall of the air supply pipe is installed with an air supply fan, the outer wall of the furnace body is located above the air supply pipe and is fixedly connected with an air intake pipe, the flue gas is diluted by a dilution mechanism, the diluted flue gas enters the furnace body through the air intake pipe, and the flue gas in the furnace body is guided by a guide mechanism.

[0007] As a further scheme of the present invention: the guiding mechanism includes a movable groove, which is opened at the top of the furnace body, the inner wall of the movable groove is slidably connected with a movable seat, the bottom end of the movable seat is fixedly connected with a mounting seat, the mounting seat is slidably connected to the inner cavity of the furnace body, the outer wall of the movable seat is fixedly connected with an arc plate, the top of the furnace body is located on one side of the movable seat and is fixedly connected with a side plate, the outer wall of the side plate is opened with a displacement groove, the inner wall of the displacement groove is slidably connected with a displacement plate, the outer wall of the displacement plate is fixedly connected with a plurality of fixed blocks, the top of the side plate is rotatably connected with a rotating block, the bottom end of the rotating block is fixedly connected with a threaded rod running through the displacement plate, and the movable seat is opened with a fixing groove on the side facing the displacement plate.

[0008] As a further solution of the present invention: the guide mechanism also includes a rotating column, the rotating column is rotatably connected to the top of the movable seat, the bottom end of the rotating column is fixedly connected to a connecting shaft, the bottom end of the connecting shaft is fixedly connected to a bevel gear, the interior of the mounting seat is located at the outer wall of the bevel gear and is rotatably connected to a rotating ring, the interior of the mounting seat is located at the inner wall of the rotating ring and is rotatably connected to a first spur gear, one end of the first spur gear is fixedly connected to a worm, the interior of the mounting seat is located at the outer wall of the worm and is rotatably connected to a worm wheel, one end of the mounting seat is rotatably connected to four air guide plates, and the air guide plates are fixedly connected to the worm wheel.

[0009] As a further solution of the present invention: a heat exchange box is fixedly connected to the outer wall of the exhaust pipe, a smoke pipe is fixedly connected to the outer wall of one side of the heat exchange box, one end of the air inlet pipe is fixedly connected to the heat exchange box, a motor is installed at the top of the heat exchange box, a second spur gear is connected to the output end of the motor, an annular seat is rotatably connected to the top of the inner cavity of the heat exchange box, the second spur gear is in contact with the annular seat, a rotating rod is fixedly connected to the bottom end of the annular seat, a dilution tube is fixedly connected to the top of the heat exchange box, a dilution fan is installed on the outer wall of the dilution tube, a connecting groove is provided at the top of the annular seat, and an air outlet is provided on the outer wall of the rotating rod.

[0010] As a further solution of the present invention: the inner wall of the furnace body is in contact with the outer wall of the mounting seat, and the outer wall of the movable seat is in contact with the inner wall of the movable groove.

[0011] As a further solution of the present invention: the inner wall of the displacement groove fits with the outer wall of the displacement plate, the outer wall of the displacement plate is provided with a threaded hole, the threaded hole matches the threaded rod, and the outer wall of the fixing block fits with the inner wall of the fixing groove.

[0012] As a further solution of the present invention: the outer ring of the rotating ring is provided with first gear teeth, the first gear teeth are meshed with the bevel gear, and the inner ring of the rotating ring is provided with second gear teeth, the second gear teeth are meshed with the first spur gear.

[0013] As a further solution of the present invention: the worm is matched with the worm wheel, the air guide plate is connected with the mounting seat via a rotating shaft, and the rotating shaft and the worm wheel are at the same axial position.

[0014] As a further solution of the present invention: the outer ring of the annular seat is provided with tooth grooves, and the tooth grooves are meshed with the second spur gear.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention draws back about 30% of the flue gas for re-burning, and the total amount of flue gas directly discharged from the chimney into the atmosphere is reduced accordingly; the flue gas is subjected to low-nitrogen treatment through flue gas re-burning, thereby reducing the concentration and amount of pollutant emissions, and there is no problem of secondary pollution due to re-treatment, and there are no other operational safety hazards, so that the investment cost of the flue gas re-burning system is relatively low and the treatment effect is significant.

[0017] 2. The smoke incinerator of the present invention is provided with a guide mechanism, and the flame passes through the center of four air guide plates, and the air guide plates guide the smoke to the flame for full combustion; the movable seat is pushed to slide, the position of the mounting seat is adjusted, the rotating column is rotated to drive the air guide plate to rotate, and the opening size of the air guide plate is adjusted, so that the smoke is guided to the flame for full combustion, and the opening size and position of the air guide plate can be flexibly adjusted according to the flame width and length of different flamethrowers.

[0018] 3. By setting up a dilution mechanism, the recovered flue gas enters the heat exchange box through the flue pipe, and the flue gas is heated by the waste heat on the exhaust pipe. The heated flue gas enters the furnace body through the air intake pipe, thereby avoiding the problem of too low flue temperature at the flue gas reflux extraction point, which leads to the generation of condensed water; the dilution mechanism can also dilute the flue gas to avoid dangerous conditions such as explosions in the furnace body due to excessive flue gas concentration; therefore, this design facilitates heating the flue gas by the waste heat on the exhaust pipe, and at the same time fully dilutes the flue gas to prevent excessive flue gas concentration from entering the furnace body and causing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the process structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the furnace body of the flue gas incinerator of the present invention;

[0021] Figure 3It is a schematic diagram of the internal structure of the furnace body of the flue gas incinerator of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the mounting base of the flue gas incinerator of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the side plate and displacement plate of the flue gas incinerator of the present invention;

[0024] Figure 6 This is a schematic diagram of the internal structure of the mounting base of the flue gas incinerator of the present invention;

[0025] Figure 7 It is a schematic diagram of the internal structure of the heat exchange box of the flue gas incinerator of the present invention;

[0026] Figure 8 The figure is a schematic diagram of the internal structure of the annular seat and the rotating rod of the flue gas incinerator of the present invention.

[0027] In the figure: 1, furnace body; 2, exhaust pipe; 3, mounting frame; 4, flamethrower; 5, air supply pipe; 6, air supply fan; 7, air intake pipe; 8, guide mechanism; 801, movable groove; 802, movable seat; 803, mounting seat; 804, curved plate; 805, side plate; 806, displacement groove; 807, rotating block; 808, threaded rod; 809, displacement plate; 810, fixed block; 811, fixed groove; 812, rotating Column; 813, connecting shaft; 814, bevel gear; 815, rotating ring; 816, first spur gear; 817, worm; 818, worm wheel; 819, air guide plate; 9, dilution mechanism; 901, heat exchange box; 902, motor; 903, second spur gear; 904, annular seat; 905, rotating rod; 906, dilution pipe; 907, dilution fan; 908, connecting groove; 909, air outlet; 10, flue gas pipe. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0030] See also Figures 1 to 8 In the embodiment of the present invention, a recovery unit, a flue gas treatment unit and a flue gas re-burning unit are included. The recovery unit includes a recovery pipeline, which is made of stainless steel and has corrosion resistance. The recovery pipeline is connected to the chimney, and the flue gas recovered by the recovery unit through the recovery pipeline is then processed by the flue gas treatment unit; the flue gas treatment unit includes a demister and a condenser, and the flue gas after demisting, condensation and drainage treatment enters the flue gas re-burning unit, and a flue gas incinerator is provided in the flue gas re-burning unit, and the flue gas is re-burned and nitrogen-reduced by the flue gas incinerator.

[0031] In this embodiment: by withdrawing about 30% of the flue gas from the chimney for re-burning, the total amount of flue gas directly discharged from the chimney into the atmosphere is reduced accordingly; the flue gas is subjected to low-nitrification treatment through flue gas re-burning to reduce the concentration and amount of pollutant emissions, and there is no problem of secondary pollution due to re-treatment, and there are no other operational safety hazards, so that the investment cost of the flue gas re-burning system is relatively low and the treatment effect is significant.

[0032] Please refer to Figures 2 to 8The flue gas incinerator includes a furnace body 1, one end of the top of the furnace body 1 is fixedly connected to an exhaust pipe 2, a mounting frame 3 is fixedly connected to the inside of the furnace body 1, a flamethrower 4 is installed on the outer wall of the mounting frame 3, one end of the furnace body 1 is fixedly connected to an air supply pipe 5, an air supply fan 6 is installed on the outer wall of the air supply pipe 5, an air intake pipe 7 is fixedly connected to the outer wall of the furnace body 1 above the air supply pipe 5, the flue gas is diluted by a dilution mechanism 9, the diluted flue gas enters the furnace body 1 through the air intake pipe 7, and the flue gas in the furnace body 1 is guided by a guide mechanism 8.

[0033] In this embodiment, the flue gas enters the furnace body 1 through the air inlet pipe 7, the flamethrower 4 sprays flames to re-burn the flue gas, the air supply fan 6 operates to drive the outside air into the furnace body 1 through the air supply pipe 5 to supplement the lack of oxygen for the combustion in the furnace body 1, and the flue gas after the re-burning treatment is discharged through the exhaust pipe 2.

[0034] Please refer to Figures 3 to 6 The guide mechanism 8 includes a movable groove 801, which is provided at the top of the furnace body 1. The inner wall of the movable groove 801 is slidably connected with a movable seat 802. The bottom end of the movable seat 802 is fixedly connected with a mounting seat 803. The mounting seat 803 is slidably connected to the inner cavity of the furnace body 1. The outer wall of the movable seat 802 is fixedly connected with an arc plate 804. The top of the furnace body 1 is located on one side of the movable seat 802 and is fixedly connected with a side plate 805. The outer wall of the side plate 805 is provided with a displacement groove 806. The inner wall of the displacement groove 806 is slidably connected with a displacement plate 809. The outer wall of the displacement plate 809 is fixedly connected with a plurality of fixed blocks 810. The top of the side plate 805 is rotatably connected with a rotating block 807. The bottom end of the rotating block 807 is fixedly connected with a threaded rod 808 that runs through the displacement plate 809. The movable seat 8 02 A fixing groove 811 is provided on one side of the displacement plate 809, and the guide mechanism 8 also includes a rotating column 812, which is rotatably connected to the top of the movable seat 802, and the bottom end of the rotating column 812 is fixedly connected to a connecting shaft 813, and the bottom end of the connecting shaft 813 is fixedly connected to a bevel gear 814. The interior of the mounting seat 803 is located on the outer wall of the bevel gear 814 and is rotatably connected to a rotating ring 815, and the interior of the mounting seat 803 is located on the inner wall of the rotating ring 815 and is rotatably connected to a first spur gear 816, one end of the first spur gear 816 is fixedly connected to a worm 817, and the interior of the mounting seat 803 is located on the outer wall of the worm 817 and is rotatably connected to a worm wheel 818, and one end of the mounting seat 803 is rotatably connected to four air guide plates 819, and the air guide plates 819 are fixedly connected to the worm wheel 818.

[0035] In this embodiment: when the flue gas is burned, since the flamethrower 4 sprays flames in a straight line and the range of the sprayed flames is limited, part of the flue gas easily passes along the edge of the furnace body 1 and does not contact with the flame in the center for full combustion, thereby affecting the re-burning effect of the flue gas. In order to improve the re-burning effect of flue gas, four air guide plates 819 are arranged, and the flame passes through the center of the four air guide plates 819. The air guide plates 819 guide the flue gas to the periphery of the flame for full combustion; when the mounting seat 803 is displaced, the movable seat 802 is pushed to slide in the movable groove 801, and the displacement of the movable seat 802 drives the mounting seat 803 to slide in the furnace body 1, and the arc plate 804 is used to block the movable groove 801 to prevent the flue gas from leaking through the movable groove 801. After moving to a suitable position, the rotating block 807 is rotated, and the rotation of the rotating block 807 drives the threaded rod 808 to rotate, and the rotation of the threaded rod 808 drives the displacement plate 809 to slide in the displacement groove 806, and the displacement of the displacement plate 809 drives the fixed block 810 to move into the fixed groove 811, and the movable seat 802 is fixed, so that the position of the mounting seat 803 is adjusted and fixed. When adjusting the opening size of the air guide plate 819, the rotating column 812 is rotated, and the rotating column 812 rotates to drive the connecting shaft 813 to rotate, and the connecting shaft 813 rotates to drive the bevel gear 814 to rotate, and the bevel gear 814 rotates to drive the rotating ring 815 to rotate, and the rotating ring 815 rotates to drive the first spur gear 816 to rotate, and the first spur gear 816 rotates to drive the worm 817 to rotate, and the worm 817 rotates to drive the worm wheel 818 to rotate, and the worm 817 rotates to drive the worm wheel 818 to rotate, and the worm wheel 818 rotates to drive the air guide plate 819 to rotate, so as to adjust the opening size of the air guide plate 819, so as to adjust the opening size and position of the air guide plate 819 according to the flame width and length of different flamethrowers 4.

[0036] Please refer to Figures 7 and 8 The outer wall of the exhaust pipe 2 is fixedly connected to a heat exchange box 901, one side outer wall of the heat exchange box 901 is fixedly connected to a smoke pipe 10, one end of the air inlet pipe 7 is fixedly connected to the heat exchange box 901, a motor 902 is installed at the top of the heat exchange box 901, and the output end of the motor 902 is connected to a second spur gear 903, the top of the inner cavity of the heat exchange box 901 is rotatably connected to an annular seat 904, the second spur gear 903 is in contact with the annular seat 904, and a rotating rod 905 is fixedly connected to the bottom end of the annular seat 904, a dilution tube 906 is fixedly connected to the top of the heat exchange box 901, a dilution fan 907 is installed on the outer wall of the dilution tube 906, a connecting groove 908 is provided at the top of the annular seat 904, and an air outlet 909 is provided on the outer wall of the rotating rod 905.

[0037] In this embodiment, the recovered flue gas enters the heat exchange box 901 through the flue gas pipe 10, and the flue gas is heated by the waste heat on the exhaust pipe 2. The heated flue gas enters the furnace body 1 through the air inlet pipe 7. At the same time, the motor 902 and the dilution fan 907 are started. The dilution fan 907 drives the outside air to enter the connecting groove 908 through the dilution pipe 906, and then enters the heat exchange box 901 through the air outlet 909 to mix with the flue gas, dilute the flue gas, and avoid explosion in the furnace body 1 due to excessive flue gas concentration. The operation of the motor 902 drives the second spur gear 903 to rotate, and the rotation of the second spur gear 903 drives the annular seat 904 to rotate, and the rotation of the annular seat 904 drives the rotating rod 905 to rotate, and the rotating rod 905 rotates to stir the heat exchange box 901, so that the air and flue gas are mixed more evenly. This design facilitates heating the flue gas by the waste heat on the exhaust pipe 2, and at the same time fully dilutes the flue gas, preventing the flue gas from entering the furnace body 1 due to excessive flue gas concentration.

[0038] Please refer to Figure 3 to Figure 4 The inner wall of the furnace body 1 fits with the outer wall of the mounting seat 803 , and the outer wall of the movable seat 802 fits with the inner wall of the movable groove 801 .

[0039] In this embodiment: the movable seat 802 is pushed to slide in the movable groove 801 , and the movable seat 802 is displaced to drive the mounting seat 803 to slide in the furnace body 1 , and the arc plate 804 is used to shield the movable groove 801 .

[0040] Please refer to Figures 4 to 5 The inner wall of the displacement groove 806 fits with the outer wall of the displacement plate 809 , the outer wall of the displacement plate 809 is provided with a threaded hole, the threaded hole matches the threaded rod 808 , and the outer wall of the fixing block 810 fits with the inner wall of the fixing groove 811 .

[0041] In this embodiment: the rotating block 807 is rotated, the rotating block 807 drives the threaded rod 808 to rotate, the threaded rod 808 drives the displacement plate 809 to slide in the displacement groove 806, the displacement of the displacement plate 809 drives the fixed block 810 to move into the fixed groove 811, and the movable seat 802 is fixed.

[0042] Please refer to Figures 5 and 6 The outer ring of the rotating ring 815 is provided with first gear teeth, which mesh with the bevel gear 814 , and the inner ring of the rotating ring 815 is provided with second gear teeth, which mesh with the first spur gear 816 .

[0043] In this embodiment, the rotating column 812 is rotated, the rotating column 812 rotates to drive the connecting shaft 813 to rotate, the connecting shaft 813 rotates to drive the bevel gear 814 to rotate, the bevel gear 814 rotates to drive the rotating ring 815 to rotate, and the rotating ring 815 rotates to drive the first straight gear 816 to rotate.

[0044] Please refer to Figures 5 and 6 The worm 817 matches the worm wheel 818, and the air guide plate 819 is connected to the mounting seat 803 through a rotating shaft, and the rotating shaft and the worm wheel 818 are at the same axial position.

[0045] In this embodiment: the rotating ring 815 rotates to drive the first spur gear 816 to rotate, the first spur gear 816 rotates to drive the worm 817 to rotate, the worm 817 rotates to drive the worm wheel 818 to rotate, the worm 817 rotates to drive the worm wheel 818 to rotate, and the worm wheel 818 rotates to drive the air guide plate 819 to rotate.

[0046] Please refer to Figures 7 and 8 The outer ring of the annular seat 904 is provided with tooth grooves, which mesh with the second spur gear 903 .

[0047] In this embodiment, the operation of the motor 902 drives the second spur gear 903 to rotate, the rotation of the second spur gear 903 drives the annular seat 904 to rotate, and the rotation of the annular seat 904 drives the rotating rod 905 to rotate.

[0048] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Flue gas re-burning low nitrogen treatment system, characterized in that: The invention comprises a recovery unit, a flue gas treatment unit and a flue gas re-burning unit, wherein the recovery unit comprises a recovery pipe, the recovery pipe is connected to a chimney, the flue gas recovered by the recovery unit through the recovery pipe is then processed by the flue gas treatment unit, the flue gas treatment unit comprises a demister and a condenser, the treated flue gas enters the flue gas re-burning unit, a flue gas incinerator is arranged in the flue gas re-burning unit, and the flue gas is re-burned and nitrogen reduction is processed by the flue gas incinerator; the flue gas incinerator comprises a furnace body (1), one end of the top of the furnace body (1) is fixedly connected to an exhaust pipe (2), The furnace body (1) is fixedly connected to a mounting frame (3) inside, a flamethrower (4) is installed on the outer wall of the mounting frame (3), an air supply pipe (5) is fixedly connected to one end of the furnace body (1), an air supply fan (6) is installed on the outer wall of the air supply pipe (5), an air intake pipe (7) is fixedly connected to the outer wall of the furnace body (1) above the air supply pipe (5), smoke is diluted by a dilution mechanism (9), the diluted smoke enters the furnace body (1) through the air intake pipe (7), and the smoke in the furnace body (1) is guided by a guide mechanism (8); The guide mechanism (8) comprises a movable groove (801), the movable groove (801) being opened at the top end of the furnace body (1), the inner wall of the movable groove (801) being slidably connected to a movable seat (802), the bottom end of the movable seat (802) being fixedly connected to a mounting seat (803), the mounting seat (803) being slidably connected to the inner cavity of the furnace body (1), the outer wall of the movable seat (802) being fixedly connected to an arc-shaped plate (804), the top end of the furnace body (1) being located on one side of the movable seat (802) being fixedly connected to a side plate (804), 5) A displacement groove (806) is provided on the outer wall of the side plate (805); a displacement plate (809) is slidably connected to the inner wall of the displacement groove (806); a plurality of fixed blocks (810) are fixedly connected to the outer wall of the displacement plate (809); a rotating block (807) is rotatably connected to the top end of the side plate (805); a threaded rod (808) penetrating the displacement plate (809) is fixedly connected to the bottom end of the rotating block (807); and a fixed groove (811) is provided on a side of the movable seat (802) facing the displacement plate (809); The guide mechanism (8) further comprises a rotating column (812), wherein the rotating column (812) is rotatably connected to the top end of the movable seat (802), the bottom end of the rotating column (812) is fixedly connected to a connecting shaft (813), the bottom end of the connecting shaft (813) is fixedly connected to a bevel gear (814), the interior of the mounting seat (803) is rotatably connected to the outer wall of the bevel gear (814), the interior of the mounting seat (803) is rotatably connected to a rotating ring (815), the interior of the mounting seat (803) is rotatably connected to the inner wall of the rotating ring (815), the first spur gear (816) is fixedly connected to one end of the first spur gear (816), the interior of the mounting seat (803) is rotatably connected to the outer wall of the worm gear (817), the interior of the mounting seat (803) is rotatably connected to a worm wheel (818), and one end of the mounting seat (803) is rotatably connected to four air guide plates (819), and the air guide plates (819) are fixedly connected to the worm wheel (818); The outer wall of the exhaust pipe (2) is fixedly connected to a heat exchange box (901), one side outer wall of the heat exchange box (901) is fixedly connected to a smoke pipe (10), one end of the air inlet pipe (7) is fixedly connected to the heat exchange box (901), a motor (902) is installed at the top of the heat exchange box (901), the output end of the motor (902) is connected to a second spur gear (903), the top of the inner cavity of the heat exchange box (901) is rotatably connected to an annular seat (904), the second spur gear (903) is in contact with the annular seat (904), the bottom end of the annular seat (904) is fixedly connected to a rotating rod (905), the top of the heat exchange box (901) is fixedly connected to a dilution tube (906), a dilution fan (907) is installed on the outer wall of the dilution tube (906), a connecting groove (908) is provided at the top of the annular seat (904), and an air outlet hole (909) is provided on the outer wall of the rotating rod (905).

2. The flue gas re-burning low-nitrification treatment system according to claim 1 is characterized in that: The inner wall of the furnace body (1) fits with the outer wall of the mounting seat (803), and the outer wall of the movable seat (802) fits with the inner wall of the movable groove (801).

3. The flue gas re-burning low-nitrification treatment system according to claim 1 is characterized in that: The inner wall of the displacement groove (806) fits with the outer wall of the displacement plate (809), the outer wall of the displacement plate (809) is provided with a threaded hole, the threaded hole matches the threaded rod (808), and the outer wall of the fixing block (810) fits with the inner wall of the fixing groove (811).

4. The flue gas re-burning low-nitrification treatment system according to claim 1 is characterized in that: The outer ring of the rotating ring (815) is provided with first gear teeth, the first gear teeth meshing with the bevel gear (814), and the inner ring of the rotating ring (815) is provided with second gear teeth, the second gear teeth meshing with the first spur gear (816).

5. The flue gas re-burning low-nitrification treatment system according to claim 1 is characterized in that: The worm (817) matches the worm wheel (818), and the air guide plate (819) is connected to the mounting seat (803) via a rotating shaft, and the rotating shaft and the worm wheel (818) are located at the same axial position.

6. The flue gas re-burning low-nitrification treatment system according to claim 1 is characterized in that: The outer ring of the annular seat (904) is provided with a tooth groove, and the tooth groove is meshed with the second spur gear (903).

Images