Industrial flue gas selective desulfurization and denitrification device and implementation method

Abstract

The invention discloses an industrial flue gas selective desulfurization and denitrification device and an implementation method, and belongs to the technical field of flue gas desulfurization and denitrification. A sewage vessel used for separating sewage containing lime is arranged at the lower end of the box body, a smoke outlet is formed in the upper end of the box body, a smoke inlet is formed in one side of the box body, a floating plate is arranged in the sewage vessel, the filtering impeller assembly is arranged in the box body and comprises a first impeller, a second impeller and a limiting frame, and the two sides of the limiting frame are each in meshed connection with two driving gears. The flue gas desulfurization and denitrification device solves the problem that discharged flue gas still contains large-content pollution particles due to the fact that existing equipment for flue gas desulfurization and denitrification is poor in sewage treatment effect and filtration effect of particles in the flue gas, and the particles in the filtered flue gas can be precipitated to the bottom of a sewage vessel through a floating plate; and a plurality of holes of the floating plate are used for separating the settled particles from water on the upper layer, so that on one hand, the particles are prevented from being conveyed to the spraying pipe again by the circulating pump, and on the other hand, the particles are conveniently discharged through the sewage outlet pipe.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas desulfurization and denitrification, and in particular to an industrial flue gas selective desulfurization and denitrification device and an implementation method thereof. Background Art

[0002] Flue gas desulfurization and denitrification is a boiler flue gas purification technology used in the chemical industry that produces a lot of nitrogen oxides and sulfur oxides. Nitrogen oxides and sulfur oxides are one of the main sources of air pollution, among which nitrogen oxides and sulfur oxides are one of the main sources of air pollution. Currently known flue gas desulfurization and denitrification technologies include PAFP, ACFP, pyrolusite method, electron beam ammonia method, pulse corona method, gypsum wet method, catalytic oxidation method, microbial degradation method and other technologies.

[0003] Publication No. CN214598228U discloses a selective desulfurization and denitrification device for flue gas from a straw burner, comprising a treatment box, a guide mechanism and a spray mechanism, a plurality of groups of legs are arranged at the bottom of the treatment box, a water inlet pipe and a drain pipe are respectively connected to the lower half of the left end of the treatment box, a smoke pipe is connected to the left end of the treatment box, a fan is arranged on the smoke pipe, the guide mechanism is installed at the right end of the treatment box, and the spray mechanism is installed in the treatment box; it also includes a first conduit, a first sealing plate, a first cover plate, a first hinge, a second cover plate, a second hinge, a first spring and a second spring, the input end of the first conduit is connected to the output end of the smoke pipe, the left end of the first sealing plate is connected to the right end of the first conduit, the right end of the first sealing plate is connected to the off-duty area of ​​the right side wall in the treatment chamber, and a plurality of groups of second conduits are equidistantly and connectedly arranged at the bottom end of the first conduit.

[0004] Although the above has solved the problem of low flue gas treatment efficiency and poor practicality of the device, the existing equipment for flue gas desulfurization and denitrification has poor effects on sewage treatment and filtering of particulate matter in flue gas, resulting in the problem that the discharged flue gas still easily contains a large amount of polluted particles.

[0005] Therefore, in order to solve the above problems, an industrial flue gas selective desulfurization and denitrification device and implementation method are proposed. Summary of the invention

[0006] The object of the present invention is to provide an industrial flue gas selective desulfurization and denitrification device and an implementation method, so as to solve the problem raised in the above background technology that the existing equipment for flue gas desulfurization and denitrification has poor effects on sewage treatment and filtering of particulate matter in flue gas, resulting in the exhaust flue gas still easily containing a large amount of polluted particles.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an industrial flue gas selective desulfurization and denitrification device, comprising a box body, a sewage dish for separating lime-containing sewage is provided at the lower end of the box body, a smoke outlet is provided at the upper end of the box body, a smoke inlet is provided on one side of the box body, a floating plate is provided in the sewage dish, and a filtering impeller assembly is arranged in the box body, the filtering impeller assembly comprises impeller 1, impeller 2 and a limit frame, and two driving gears are meshed and connected on both sides of the limit frame.

[0008] Preferably, a support platform is provided on the outer surface of the box body, a circulation pump and a supply pump are provided on the support platform, a circulation pipe is provided at the upper end of the circulation pump, the upper end of the circulation pipe extends into the box body, and is used to recycle part of the water in the sewage dish. A sewage outlet pipe is provided outside the sewage dish.

[0009] Preferably, a plurality of groups of spray pipes are provided in the box body and arranged in sequence up and down, one of the spray pipes is connected with the circulation pipe, a plurality of water inlet pipes are provided on the outer surface of the box body, and the front ends of the plurality of water inlet pipes are connected with the plurality of groups of spray pipes through the box body.

[0010] Preferably, the multiple spray pipes include a straight pipe, a plurality of water distribution pipes and a plurality of nozzles, the plurality of water distribution pipes are connected to the left and right sides of the spray pipe, the plurality of nozzles are equidistantly connected to the left and right sides of the water distribution pipes and are all interconnected, the front and rear ends of the multiple straight pipes are connected to a limiting pipe, one end is used to connect the water inlet pipe and the circulation pipe, and the other end is used to be fixed to the inner wall of the box.

[0011] Preferably, three slide grooves are opened on the inner wall of the sewage dish, sliding blocks are provided on the outer side of the floating plate and are movably connected to the slide grooves, a driving member is provided at the bottom of the sewage dish, two stirring rods are provided on the outer side of the driving member and are located below the floating plate.

[0012] Preferably, the filter impeller assembly is located above multiple groups of spray pipes, the outer surface of the limit frame is provided with roller patterns, the lower end of impeller 2 is provided with a rubber ring for fixing to the upper surface of the limit frame, impeller 2 and impeller 1 are movably connected, two driving gears are located, a control circle is provided on the outer surface of the box body, two driving motors are provided in the control circle, and rotating rods are provided at the lower ends of the two driving motors, and are electrically connected to the driving gears.

[0013] Preferably, an opening for flue gas is provided on an upper surface of the impeller, and a filter is provided at the opening. The filter is composed of multiple groups of filter plates and arranged in a W shape.

[0014] An implementation method of an industrial flue gas selective desulfurization and denitrification device comprises the following steps:

[0015] Step 1: First, the limestone emulsion is sent into the box through the supply pump, and some clean water can be sent to multiple groups of spray pipes through the water inlet pipe, and the smoke that needs to be desulfurized and denitrified enters the box from the smoke inlet;

[0016] Step 2: Subsequently, water mixed with limestone emulsion is sprayed toward the flue gas through the spray pipe, and clean water is also sprayed through the spray pipe to desulfurize the flue gas. Then part of the flue gas will dissolve in the water and fall into the sewage dish below. The floating plate in the sewage dish gradually floats up with the falling liquid, so that the particles in the flue gas fall to the bottom of the sewage dish through the hole, and the desulfurized flue gas continues to rise;

[0017] Step 3: At this time, the filter impeller assembly starts to rotate under the action of the driving gear, and the impeller 2 and the impeller 1 in the structure filter the particulate matter in the flue gas, causing it to collide when it contacts the impeller blades and fall into the sewage dish, and then be filtered twice by the filter sheet. Finally, the treated flue gas continues to rise until it is discharged through the smoke outlet of the box.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The floating plate of the present invention can settle the particles in the filtered flue gas to the bottom of the sewage dish, and separate the settled particles from the upper water through the multiple holes of the floating plate, on the one hand, it can prevent the particles from being sent to the spray pipe again by the circulation pump, because the spray holes of the nozzles of the spray pipe are small, if the particles are stuck, and the flue gas after desulfurization and the limestone emulsion will produce gypsum after long-term precipitation, which will cause blockage, on the other hand, it can facilitate the discharge of the limestone emulsion and the diluted part through the sewage outlet pipe;

[0020] 2. The filter impeller assembly of the present invention can filter and discharge large and small particles in the smoke, reduce the particulate matter in the smoke, and cooperate with the filter plate to filter relatively small particles. Since the side of the filter plate is set to be W-shaped, the smoke can be filtered through the tortuous surface, reducing the pollution of the smoke exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the processing equipment of the present invention;

[0022] Figure 2 The cross-section diagram of the processing equipment of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 3 The cross-section diagram of the processing equipment of the present invention is shown in FIG. Figure 2 ;

[0024] Figure 4 This is a schematic diagram of the structure of the filter impeller assembly of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the spray pipe of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the filter sheet of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the sewage dish of the present invention.

[0028] In the figure: 1. Box body; 101. Circulation pump; 102. Supply pump; 103. Circulation pipe; 104. Water inlet pipe; 2. Smoke outlet; 3. Smoke inlet; 4. Control circle; 5. Support platform; 6. Sewage dish; 601. Sewage outlet pipe; 602. Chute; 603. Driving member; 604. Stirring rod; 7. Floating plate; 701. Sliding block; 8. Spray pipe; 801. Water distribution pipe; 802. Limiting pipe; 803. Spray head; 9. Filter impeller assembly; 901. Impeller one; 902. Limiting frame; 903. Impeller two; 10. Driving gear; 1001. Rotating rod; 1002. Driving motor; 11. Filter. DETAILED DESCRIPTION

[0029] 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.

[0030] In order to solve the technical problem that the existing equipment for flue gas desulfurization and denitrification has poor effect on wastewater treatment and filtration of particulate matter in flue gas, resulting in the exhaust gas still containing a large amount of polluted particles, please refer to Figures 1 to 7 , providing the following technical solutions:

[0031] A selective desulfurization and denitrification device for industrial flue gas comprises a casing 1, a sewage dish 6 for separating lime-containing sewage is provided at the lower end of the casing 1, a sewage outlet pipe 601 is provided outside the sewage dish 6, a smoke outlet 2 is provided at the upper end of the casing 1, a smoke inlet 3 is provided at one side of the casing 1, a control circle 4 is provided on the outer surface of the casing 1, a support platform 5 is provided on the outer surface of the casing 1, a circulation pump 101 and a supply pump 102 are provided on the support platform 5, a circulation pipe 103 is provided at the upper end of the circulation pump 101, the upper end of the circulation pipe 103 extends into the casing 1 and is used to circulate the water in the sewage dish 6, a plurality of water inlet pipes 104 are provided on the outer surface of the casing 1, a floating plate 7 is provided in the sewage dish 6, a filter impeller assembly 9 is arranged in the casing 1, the filter impeller assembly 9 comprises an impeller 1 901, an impeller 2 903 and a limit frame 902, and two driving gears 10 are meshedly connected on both sides of the limit frame 902, such as Figure 1 and 2 As shown, the limestone emulsion is delivered into the housing 1 by a supply pump 102, and the sewage dish 6 is used to store the limestone emulsion and the sulfur-containing nitrate liquid after diluting the flue gas.

[0032] In this embodiment, if Figure 5As shown, a plurality of groups of spray pipes 8 are provided in the box body 1, and are arranged in sequence up and down, one of the spray pipes 8 is connected with the circulation pipe 103, and the front ends of the plurality of water inlet pipes 104 are connected with the plurality of groups of spray pipes 8 through the box body 1, and the plurality of spray pipes 8 include straight pipes, a plurality of water branch pipes 801 and a plurality of nozzles 803, the plurality of water branch pipes 801 are connected with the left and right sides of the spray pipe 8, the plurality of nozzles 803 are connected with the left and right sides of the water branch pipe 801 at equal distances, and are all connected, the front and rear ends of the plurality of straight pipes are connected with the limiting pipe 802, one end is used to connect the water inlet pipe 104 and the circulation pipe 103, and the other end is used to be fixed to the inner wall of the box body 1.

[0033] In this embodiment, if Figure 7 As shown, three slide grooves 602 are opened on the inner wall of the sewage dish 6, and sliders 701 are provided on the outer sides of the floating plates 7 and are movably connected to the slide grooves 602. A driving member 603 is provided at the bottom of the sewage dish 6, and two stirring rods 604 are provided on the outer sides of the driving member 603 and are located below the floating plates 7. The floating plates 7 in the sewage dish 6 cause the particles in the flue gas to settle to the bottom of the sewage dish 6 through the holes on the surface, which separates the particles from the liquid. This can prevent the particles from being sent to the spray pipe 8 again by the circulating pump 101. On the other hand, the high-concentration limestone emulsion that can be discharged from the sewage dish 6 is separated from the relatively diluted limestone emulsion on the upper surface, thereby ensuring the spraying effect of desulfurization and denitrification of the flue gas. The two stirring rods 604 can prevent the high-concentration limestone emulsion from forming lumps after precipitation, which makes it difficult to discharge from the sewage dish 6.

[0034] In this embodiment, if Figure 3 , Figure 4 and Figure 6 As shown, the filtering impeller assembly 9 is located above the multiple groups of spray pipes 8, the outer surface of the limit frame 902 is provided with roller patterns, the lower end of the impeller 2 903 is provided with a rubber ring for fixing with the upper surface of the limit frame 902, the impeller 2 903 is movably connected with the impeller 1 901, and two driving gears 10 are located, and two driving motors 1002 are provided in the control circle 4, and the lower ends of the two driving motors 1002 are provided with a rotating rod 1001, and are electrically connected to the driving gear 10, the upper surface of the impeller 1 901 is provided with an opening for passing smoke, and a filter plate 11 is provided at the opening, and the filter plate 11 is composed of multiple groups of filter plates and is arranged in a W shape, and the impeller 2 903 and impeller 1 901 rotate with the limit frame 902, and the blades in impeller 2 903 and impeller 1 901 form resistance to the particulate matter, which causes the particles in the flue gas to collide and fall downward into the sewage dish 6, thereby reducing the particulate matter in the flue gas. The filtering impeller assembly 9 cooperates with the filter plate 11 to filter relatively small particles. Since the side of the filter plate 11 is set to be W-shaped, the flue gas can be filtered through the tortuous surface. The rubber ring set at the lower end of impeller 2 903 is convenient for regular removal of the impeller 2 903 and the blades in impeller 1 901 for cleaning. The rotation of the limit frame 902 is driven by the driving gear 10.

[0035] Working principle: First, the control device controls the processing equipment to start the desulfurization and denitrification operation. First, the limestone emulsion is sent into the sewage dish 6 of the box body 1 through the supply pump 102, and some clean water can be sent to multiple groups of spray pipes 8 through the water inlet pipe 104. The flue gas that needs desulfurization and denitrification enters the box body 1 from the smoke inlet 3, and the limestone emulsion in the sewage dish 6 is sent to the spray pipe 8 through the circulation pipe 103 by the set circulation pump 101. The spray pipe 8 sprays the water mixed with the limestone emulsion toward the flue gas, and the clean water also enters the spray pipe 8 through the water inlet pipe 104 for spraying, and the flue gas is desulfurized. Then part of the flue gas will dissolve in the water and fall into the sewage dish 6 below, and the sewage The floating plate 7 in the water dish 6 gradually floats up with the falling liquid, so that the particles in the flue gas fall to the bottom of the sewage dish 6 through the hole, and the flue gas after desulfurization continues to rise. The stirring rod 604 at the bottom of the sewage dish 6 stirs the high-concentration limestone emulsion to prevent caking after precipitation, and discharges it from the sewage pipe 601. At this time, the filter impeller assembly 9 is started to rotate under the action of the driving gear 10, and the impeller 2 903 and the impeller 1 901 in the structure filter the particles in the flue gas so that they are collided when contacting the wheel blades and fall into the sewage dish 6, and are filtered twice by the filter plate 11. Finally, the treated flue gas continues to rise until it is discharged through the smoke outlet 2 of the box body 1.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. An industrial flue gas selective desulfurization and denitrification device, characterized by: include The box body (1) has a sewage dish (6) at its lower end for separating the lime-containing sewage, a smoke outlet (2) at its upper end, a smoke inlet (3) at one side of the box body (1), and a floating plate (7) inside the sewage dish (6); The filter impeller assembly (9) is arranged in the housing (1), and comprises an impeller 1 (901), an impeller 2 (903) and a limit frame (902), and two driving gears (10) are meshedly connected on both sides of the limit frame (902).

2. The industrial flue gas selective desulfurization and denitrification device according to claim 1, characterized in that: The outer surface of the box body (1) is provided with a support platform (5), and a circulation pump (101) and a supply pump (102) are provided on the support platform (5). A circulation pipe (103) is provided at the upper end of the circulation pump (101), and the upper end of the circulation pipe (103) extends into the box body (1) and is used to circulate part of the water in the sewage dish (6). A sewage outlet pipe (601) is provided on the outer side of the sewage dish (6).

3. The industrial flue gas selective desulfurization and denitrification device according to claim 2, characterized in that: The box body (1) is provided with a plurality of groups of spray pipes (8) arranged in sequence up and down, one of the spray pipes (8) is connected in a through-connection with the circulation pipe (103), and a plurality of water inlet pipes (104) are provided on the outer surface of the box body (1), and the front ends of the plurality of water inlet pipes (104) are connected in a through-connection with the plurality of groups of spray pipes (8) through the box body (1).

4. The industrial flue gas selective desulfurization and denitrification device according to claim 3, characterized in that: The plurality of spray pipes (8) comprise a straight pipe, a plurality of water distribution pipes (801) and a plurality of nozzles (803); the plurality of water distribution pipes (801) are connected to the left and right sides of the spray pipe (8); the plurality of nozzles (803) are connected to the left and right sides of the water distribution pipe (801) at equal distances and are in communication with each other; the front and rear ends of the plurality of straight pipes are connected to a limiting pipe (802); one end is used to connect to the water inlet pipe (104) and the circulation pipe (103); and the other end is used to be fixed to the inner wall of the box body (1).

5. The industrial flue gas selective desulfurization and denitrification device according to claim 1, characterized in that: The inner wall of the sewage dish (6) is provided with three slide grooves (602), the outer side of the floating plate (7) is provided with sliders (701) and are movably connected to the slide grooves (602), the bottom of the sewage dish (6) is provided with a driving member (603), and the outer side of the driving member (603) is provided with two stirring rods (604) and is located below the floating plate (7).

6. The industrial flue gas selective desulfurization and denitrification device according to claim 1, characterized in that: The filtering impeller assembly (9) is located above the multiple groups of spray pipes (8), the outer surface of the limiting frame (902) is provided with roller patterns, the lower end of the second impeller (903) is provided with a rubber ring for fixing with the upper surface of the limiting frame (902), the second impeller (903) and the first impeller (901) are movably connected, the two driving gears (10) are located, the outer surface of the box body (1) is provided with a control circle (4), the control circle (4) is provided with two driving motors (1002), the lower ends of the two driving motors (1002) are provided with a rotating rod (1001), and both are electrically connected to the driving gear (10).

7. The industrial flue gas selective desulfurization and denitrification device according to claim 6, characterized in that: An opening for passing smoke is provided on the upper surface of the impeller 1 (901), and a filter plate (11) is provided at the opening. The filter plate (11) is composed of multiple groups of filter plates and arranged in a W shape.

8. The implementation method of the industrial flue gas selective desulfurization and denitrification device according to any one of claims 1 to 7 is characterized in that: The following steps are involved: Step 1: The limestone emulsion is fed into the housing (1) through a supply pump (102), and some clean water is fed to a plurality of spray pipes (8) through a water inlet pipe (104), and the smoke to be desulfurized and denitrified enters the housing (1) through a smoke inlet (3); Step 2: water mixed with limestone emulsion is sprayed toward the flue gas through the spray pipe (8), and clean water is also sprayed through the spray pipe (8) to desulfurize the flue gas. Then, part of the flue gas will dissolve in the water and fall into the sewage dish (6) below. The floating plate (7) in the sewage dish (6) gradually floats up with the falling liquid, so that the particles in the flue gas fall to the bottom of the sewage dish (6) through the hole, and the flue gas after desulfurization continues to rise; Step 3: The filter impeller assembly (9) is started to rotate under the action of the driving gear (10), and the impeller 2 (903) and the impeller 1 (901) in the structure filter the particulate matter in the smoke, causing it to collide when it contacts the impellers and fall into the sewage dish (6), and then be filtered twice by the filter sheet (11). Finally, the treated smoke continues to rise until it is discharged through the smoke outlet (2) of the box body (1).

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