Steel sintering flue gas desulfurization and denitrification equipment

Abstract

The utility model relates to the technical field of flue gas treatment discloses a kind of steel sintering flue gas desulfurization and denitrification equipment, including processing jar, the lower end of the processing jar is fixedly connected with the valve being communicated in its inside, and the lower end of the front surface of processing jar is equipped with smoke inlet;The right side of the processing jar is provided with desorption mechanism;The front surface of the processing jar is provided with filter mechanism at the position opposite to smoke inlet;The inside of the processing jar is provided with smoke outlet mechanism;The utility model is by being provided with the smoke outlet mechanism with coil pipe and multiple smoke pipes, the entering strand-shaped flue gas is physically divided into a large number of uniform distribution small jet, significantly increase the initial contact area of flue gas and reagent;At the same time, using airflow impact fan blade automatic drive rotating piece rotation, reagent and flue gas are stirred and sheared, so that reagent and flue gas are deeply mixed in turbulent flow, and the efficiency of desulfurization and denitrification is significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, specifically a desulfurization and denitrification device for steel sintering flue gas. Background Technology

[0002] The flue gas emitted during the sintering process of steel structures contains residual sulfur and nitrates. Direct discharge of the flue gas will cause environmental pollution. Therefore, the flue gas needs to be treated before being emitted. This process uses a flue gas desulfurization and denitrification reactor.

[0003] However, in general flue gas desulfurization and denitrification reactors used for steel structure sintering, the flue gas generated during steel structure sintering contains impurities, which accumulate inside the reactor during flue gas treatment.

[0004] A Chinese patent discloses a flue gas desulfurization and denitrification reactor for steel structure sintering (authorization announcement number CN219897632U). In this patented technology, the mesh diameter of the left filter screen is larger than that of the right filter screen, so that after the flue gas enters the interior of the filter box, it is filtered by the two sets of filter screens on the left and right sides, leaving impurities on the support plate, thus facilitating the filtration of impurities in the flue gas.

[0005] However, it has certain drawbacks: after preliminary filtration, the flue gas enters the reaction chamber directly through the inlet pipe in a stream shape and flows upward, while the absorbent is sprayed from top to bottom through the nozzle; however, since the flue gas enters the reaction chamber in a concentrated stream shape, its contact with the absorbent is often insufficient, which can easily lead to some flue gas failing to mix effectively with the absorbent before rising rapidly and escaping, thus affecting the overall desulfurization and denitrification efficiency. Utility Model Content

[0006] The purpose of this invention is to provide a desulfurization and denitrification device for sintering flue gas in steel production, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A desulfurization and denitrification device for sintering flue gas of steel includes a treatment tank, wherein a valve connected to the lower end of the treatment tank is fixedly connected to the lower end of the treatment tank and a flue gas inlet is provided at the lower end of the front surface of the treatment tank.

[0009] A desorption mechanism is provided on the right side of the treatment tank;

[0010] A filter mechanism is provided on the front surface of the treatment tank, directly opposite the smoke inlet;

[0011] The processing tank is provided with a smoke outlet mechanism, which includes a connecting cover. A coil communicating with the interior of the connecting cover is fixed to the rear surface of the connecting cover. A plurality of smoke outlet pipes communicating with the interior of the coil are fixed to the lower surface of the coil. A rotating component is provided on the inner side of the smoke outlet pipe.

[0012] As a further embodiment of this utility model: the rotating component includes a connecting plate, and a rotating rod is rotatably connected through the interior of the connecting plate. A fan blade and a rotating plate are respectively fixed to the upper and lower ends of the rotating rod.

[0013] As a further embodiment of this utility model: the front end of the connecting cover is fixed to the inner front surface of the processing tank, and the connecting cover is directly opposite the smoke inlet; the end of the connecting plate is fixed to the inner surface of the smoke outlet pipe; the fan blade is located inside the smoke outlet pipe; and the rotating blade is located below the smoke outlet pipe.

[0014] As a further embodiment of this utility model: the desorption mechanism includes a reagent tank and a delivery pump located on the left side of the reagent tank. The inlet end of the delivery pump is fixedly connected to an inlet pipe, which is fixedly connected to the reagent tank. The outlet end of the delivery pump is fixedly connected to an outlet pipe, which is fixedly connected to the upper part of the right side surface of the treatment tank.

[0015] As a further embodiment of this utility model: the filtering mechanism includes a filter cover, the front surface of the filter cover is fixedly connected to a smoke inlet pipe communicating with its interior, and the upper surface of the filter cover is movably connected to a filter plate, the upper end of the filter plate being fixedly connected to a fixing block.

[0016] As a further improvement of this utility model: the rear end of the filter cover is fixed to the front surface of the treatment tank, and the filter cover is directly opposite the smoke inlet.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention, by setting up a flue gas outlet mechanism with a coil and multiple flue gas outlet pipes, physically divides the incoming stream of flue gas into a large number of uniformly distributed fine jets, significantly increasing the initial contact area between the flue gas and the reagent; at the same time, by using the airflow impacting the fan blades to automatically drive the rotating vanes to rotate, the reagent and flue gas are stirred and sheared, so that the reagent and flue gas are deeply mixed in turbulence, achieving a significant improvement in desulfurization and denitrification efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a desulfurization and denitrification device for sintering steel flue gas.

[0020] Figure 2 This is a schematic diagram of the flue gas inlet in a desulfurization and denitrification device for steel sintering flue gas.

[0021] Figure 3This is a schematic diagram of the desorption mechanism in a desulfurization and denitrification equipment for steel sintering flue gas.

[0022] Figure 4 This is a schematic diagram of the filtration mechanism in a desulfurization and denitrification equipment for steel sintering flue gas.

[0023] Figure 5 This is a schematic diagram of the filtration mechanism in a desulfurization and denitrification device for steel sintering flue gas from the rear side.

[0024] Figure 6 This is a schematic cross-sectional view of a treatment tank in a desulfurization and denitrification equipment for steel sintering flue gas.

[0025] Figure 7 This is a schematic diagram of the flue gas outlet mechanism in a desulfurization and denitrification equipment for steel sintering flue gas.

[0026] Figure 8 This is a schematic diagram of the rotating component in a desulfurization and denitrification device for steel sintering flue gas.

[0027] In the diagram: 1. Treatment tank; 2. Valve; 3. Smoke inlet; 4. Desorption mechanism; 5. Chemical tank; 6. Transfer pump; 7. Water inlet pipe; 8. Water outlet pipe; 9. Filtration mechanism; 10. Filter cover; 11. Smoke inlet pipe; 12. Filter plate; 13. Fixing block; 14. Smoke outlet mechanism; 15. Connecting cover; 16. Coil; 17. Smoke outlet pipe; 18. Rotating component; 19. Connecting plate; 20. Rotating rod; 21. Fan blade; 22. Rotating vane. Detailed Implementation

[0028] Please see Figures 1-3 In this embodiment of the present invention, a desulfurization and denitrification device for sintering flue gas of steel includes a treatment tank 1;

[0029] The treatment tank 1 is a vertical cylindrical container with conical head design at both the top and bottom. The top end can be connected to a pipe to discharge the desulfurized and denitrified steel sintering flue gas to a designated area.

[0030] A valve 2 connected to the interior of the treatment tank 1 is fixedly connected to the lower end of the tank.

[0031] Valve 2 is used for wastewater discharge, and it is preferably an electric rubber-lined slag discharge valve;

[0032] A smoke inlet 3 is provided at the lower end of the front surface of the treatment tank 1;

[0033] Smoke inlet 3 is used for the discharge of pressurized flue gas;

[0034] A desorption mechanism 4 is provided on the right side of the treatment tank 1. The desorption mechanism 4 includes a reagent tank 5 and a transfer pump 6 located on the left side of the reagent tank 5.

[0035] The reagent tank 5 is filled with reagents for flue gas desulfurization and denitrification, such as a 5-15% urea solution or a mixed solution of magnesium hydroxide and sodium hypochlorite.

[0036] The medicine box 5 includes a box body and a lid at the top;

[0037] The transfer pump 6 is a centrifugal or metering pump, and its flow rate and head are determined based on the spray volume and system resistance.

[0038] The inlet end of the delivery pump 6 is fixedly connected to the inlet pipe 7, which is fixedly connected to the reagent tank 5 and is connected to the inside of the reagent tank 5.

[0039] The outlet end of the transfer pump 6 is fixedly connected to the outlet pipe 8, which is fixedly connected to the upper part of the right side surface of the treatment tank 1.

[0040] A nozzle is installed at one end of the water outlet pipe 8 located inside the treatment tank 1. The nozzle is preferably an atomizing nozzle.

[0041] exist Figure 1 , Figure 2 , Figure 4 and Figure 5 In the middle: A filter mechanism 9 is provided on the front surface of the treatment tank 1, which is directly opposite the smoke inlet 3. The filter mechanism 9 includes a filter cover 10. The rear end of the filter cover 10 is fixed to the front surface of the treatment tank 1, and the filter cover 10 is directly opposite the smoke inlet 3.

[0042] The filter cover 10 is a hollow cover-shaped structure with an opening at the rear end;

[0043] A smoke inlet pipe 11 communicating with the interior of the filter cover 10 is fixedly connected to the front surface of the filter cover 10;

[0044] The flue gas inlet pipe 11 can be connected to pressurized flue gas through a pipeline;

[0045] A filter plate 12 is movably connected through the upper surface of the filter cover 10;

[0046] The filter plate 12 is used to filter dust in flue gas. Its filter medium is preferably metal sintered felt or high-temperature resistant synthetic fiber filter plate, which is used to intercept dust particles with larger particle size and easy to wear equipment in flue gas.

[0047] When the filter plate 12 is located inside the filter cover 10, its upper surface is flush with the upper surface of the filter cover 10, and the other surfaces are attached to the inner surface of the filter cover 10.

[0048] A silicone rubber sealing strip is provided between the filter plate 12 and the filter cover 10;

[0049] A fixing block 13 is fixedly connected to the upper end of the filter plate 12;

[0050] The fixing block 13 is fixed to the upper surface of the filter cover 10 by bolts. After loosening the bolts, the filter plate 12 can be pulled upwards for easy cleaning or replacement.

[0051] exist Figure 1 , Figure 2 , Figure 6 and Figure 7 In the middle: A smoke outlet mechanism 14 is provided on the inner side of the treatment tank 1. The smoke outlet mechanism 14 includes a connecting cover 15. The front end of the connecting cover 15 is fixed to the inner front surface of the treatment tank 1. The two can be fixed by bolts. A sealing ring can be provided at the connection. The connecting cover 15 is directly opposite the smoke inlet 3.

[0052] A coil 16 communicating with the interior is fixed to the rear surface of the connecting cover 15, and a plurality of smoke outlet pipes 17 communicating with the interior are fixed to the lower surface of the coil 16.

[0053] Coil 16 is a continuously bent spiral pipe;

[0054] Multiple flue gas outlets 17 physically divide the originally concentrated flue gas into multiple small jets, thereby increasing the contact area between the flue gas and the reagent, and thus improving the desulfurization and denitrification efficiency.

[0055] The airflow velocity ejected from the exhaust pipe 17 is preferably 15-25 m / s. This avoids the situation where the velocity is too low to overcome the starting resistance of the fan blades and maintain stable rotation, and the velocity is too high to increase noise.

[0056] exist Figure 7 and Figure 8 In the middle: A rotating component 18 is provided on the inner side of the smoke outlet pipe 17. The rotating component 18 includes a connecting plate 19. The end of the connecting plate 19 is fixed to the inner surface of the smoke outlet pipe 17. The two can be fixed by bolts, so that the entire rotating component 18 can be disassembled.

[0057] A rotating rod 20 is rotatably connected through the inside of the connecting plate 19, and the two can be rotatably connected by a bearing.

[0058] The bearings are preferably deep groove ball bearings or oil-impregnated sliding bearings with low coefficient of friction;

[0059] The upper and lower ends of the rotating rod 20 are respectively fixed with a fan blade 21 and a rotating blade 22. The fan blade 21 is located inside the smoke outlet pipe 17, and the rotating blade 22 is located below the smoke outlet pipe 17.

[0060] The cross-sectional shape of the blade 21 is recommended to adopt a standard low-speed airfoil, such as the NACA 44XX, NACA 63XX or GA(W)-1 series airfoils, which have good lift-to-drag ratio at medium Reynolds numbers. Furthermore, the ratio of the maximum thickness of the airfoil to the chord length is preferably between 8-15%, and the ratio of the airfoil centerline curvature height to the chord length is preferably between 2-6%. The static installation angle is preferably between 15° and 25°, so that it is in the optimal angle of attack range at the rated flue gas velocity. Through the above design, a large starting torque is obtained at the initial impact of the flue gas, avoiding airflow separation on the back of the blade, which can cause stalling, reduce efficiency, and may even lead to rotational instability or even stalling.

[0061] At the rated flue gas velocity, the driving torque generated by the fan blade 21 should be approximately 1.5-2.0 times the torque required for the rotating blade 22 to rotate in the agent, so as to leave sufficient margin to cope with fluctuations in operating conditions.

[0062] The ejected flue gas impacts the fan blade 21, causing the fan blade 21 to drive the rotating blade 22 to rotate via the rotating rod 20. The rotating blade 22 stirs and shears the flue gas and the reagent, on the one hand further breaking down and atomizing the reagent droplets into finer droplets, increasing the contact area between the gas and liquid phases; on the other hand, it creates strong turbulence, allowing the flue gas and the reagent to mix deeply and uniformly, ultimately greatly improving the reaction efficiency of desulfurization and denitrification.

[0063] The working principle of this utility model is as follows: the pressurized flue gas enters the filter hood 10 through the inlet pipe 11, is filtered and dust removed by the filter plate 12, and then enters the connecting hood 15 inside the treatment tank 1 through the inlet 3; then the flue gas enters the coil 16 and is sprayed out in the form of fine jets through multiple outlet pipes 17. The sprayed flue gas first impacts the fan blade 21, driving the rotating rod 20 and the rotating blade 22 to rotate; the rotating blade 22 stirs and shears the downward absorbent droplets and the upward flue gas flow; at the same time, the absorbent sprayed from the nozzle at the end of the outlet pipe 8 comes into countercurrent contact with the flue gas after enhanced dispersion and mixing and reacts. Finally, the purified flue gas is discharged through the top of the treatment tank 1, and the reaction products are discharged periodically through the valve 2.

[0064] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0065] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A desulfurization and denitrification device for sintering steel flue gas, comprising a treatment tank (1), characterized in that, The lower end of the treatment tank (1) is fixedly connected to a valve (2) that communicates with its interior, and a smoke inlet (3) is opened at the lower end of the front surface of the treatment tank (1). A desorption mechanism (4) is provided on the right side of the treatment tank (1). A filter mechanism (9) is provided on the front surface of the treatment tank (1) at the position opposite to the smoke inlet (3). The processing tank (1) is provided with a smoke outlet mechanism (14) on its inner side. The smoke outlet mechanism (14) includes a connecting cover (15). A coil (16) communicating with the inside of the connecting cover (15) is fixedly connected to the rear surface of the connecting cover (15). A plurality of smoke outlet pipes (17) communicating with the inside of the coil (16) are fixedly connected to the lower surface of the coil (16). A rotating part (18) is provided on the inner side of the smoke outlet pipe (17).

2. The desulfurization and denitrification equipment for steel sintering flue gas according to claim 1, characterized in that, The rotating component (18) includes a connecting plate (19), and a rotating rod (20) is rotatably connected through the interior of the connecting plate (19). The upper and lower ends of the rotating rod (20) are respectively fixed with a fan blade (21) and a rotating plate (22).

3. The desulfurization and denitrification equipment for steel sintering flue gas according to claim 2, characterized in that, The front end of the connecting cover (15) is fixed to the inner front surface of the processing tank (1), and the connecting cover (15) is directly opposite the smoke inlet (3). The end of the connecting plate (19) is fixed to the inner surface of the smoke outlet pipe (17). The fan blade (21) is located inside the smoke outlet pipe (17), and the rotating blade (22) is located below the smoke outlet pipe (17).

4. The desulfurization and denitrification equipment for steel sintering flue gas according to claim 1, characterized in that, The desorption mechanism (4) includes a reagent tank (5) and a delivery pump (6) located on the left side of the reagent tank (5). The inlet end of the delivery pump (6) is fixedly connected to an inlet pipe (7), which is fixedly connected to the reagent tank (5). The outlet end of the delivery pump (6) is fixedly connected to an outlet pipe (8), which is fixedly connected to the upper part of the right side surface of the treatment tank (1).

5. The desulfurization and denitrification equipment for iron and steel sintering flue gas according to claim 1, characterized in that, The filtration mechanism (9) includes a filter cover (10), the front surface of which is fixedly connected to a smoke inlet pipe (11) communicating with its interior, and the upper surface of the filter cover (10) is movably connected to a filter plate (12), the upper end of which is fixedly connected to a fixing block (13).

6. The desulfurization and denitrification equipment for iron and steel sintering flue gas according to claim 5, characterized in that, The rear end of the filter cover (10) is fixed to the front surface of the processing tank (1), and the filter cover (10) is directly opposite the smoke inlet (3).

Images