Thermal power generation desulfurization and denitrification equipment based on SCR (Selective Catalytic Reduction) technology

Abstract

The utility model relates to the technical field of environmental protection, in particular to thermal power generation desulfurization and denitrification equipment based on an SCR (Selective Catalytic Reduction) technology, which comprises an SCR denitrification reaction tank, a smoke inlet pipe fixedly connected with the bottom end of the side wall of one side of the SCR denitrification reaction tank, a catalyst bed layer mounted in the SCR denitrification reaction tank, a filter screen plate mounted below the catalyst bed layer in the SCR denitrification reaction tank, and a smoke outlet pipe fixedly connected with the smoke inlet pipe, according to the SCR denitration reaction tank, through cooperative arrangement of a forward and reverse motor, a scraping plate, an arc-shaped sealing plate and other structures, when the SCR denitration reaction tank is used, the forward and reverse motor is started to enable a rotating shaft and a rotating pipe to rotate, the arc-shaped sealing plate is made to block a smoke inlet pipe, and the smoke inlet pipe is blocked by the scraping plate; the rotating shaft drives the scraping plate to scrape the filter screen plate, dust on the filter screen plate is scraped off, and the problems that due to the power influence of flue gas rising, blocked dust is adsorbed on the flow guide plate and is difficult to fall off, too much dust is easily accumulated on the flow guide plate to cause blockage, and flue gas passing is affected are solved as much as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to a thermal power generation desulfurization and denitrification device based on SCR technology. Background Art

[0002] Currently, my country primarily relies on thermal power generation, primarily through coal combustion. Coal-fired power plant exhaust primarily comes from flue gas generated by boiler combustion. Pollutants in flue gas include fly ash, SO₂, NOx, CO, CO₂, and small amounts of fluorides and chlorides. The proportion of these pollutants depends on the mineral composition of the coal, with the primary pollutants being fly ash, coal dust, SO₂, and NOx.

[0003] The utility model patent with announcement number CN218422034U proposes a coal-fired boiler flue gas SCR denitrification wet desulfurization device, including a smoke inlet pipe and an SCR denitrification reactor arranged at one end of the smoke inlet pipe. The smoke inlet pipe and the SCR denitrification reactor are interconnected. An ash hopper is installed at the bottom of the SCR denitrification reactor. The smoke inlet pipe is adjacent to the bottom of the SCR denitrification reactor. A catalyst bed is installed on the inner wall of the SCR denitrification reactor.

[0004] The above-mentioned coal-fired boiler flue gas SCR denitrification wet desulfurization device is inclined with the flue gas in the inlet flue through the guide plate, so that the flue gas entering the SCR denitrification reactor from the boiler tail flue is fully mixed, the flue gas flow rate and NOx distribution are adjusted, and at the same time it has a certain blocking effect on dust with large particle size, effectively solving the problems of flue and catalyst wear caused by uneven flue gas distribution and NOx emissions from the boiler tail flue gas not meeting the standards. However, when the guide plate blocks the dust, due to the influence of the rising power of the flue gas, the blocked dust will be adsorbed on the guide plate and difficult to fall off, which can easily cause the guide plate to be clogged due to excessive dust accumulation, resulting in the problem of affecting the passage of flue gas. Utility Model Content

[0005] The purpose of the present invention is to solve or at least alleviate the existing coal-fired boiler flue gas SCR denitrification wet desulfurization device, by inclining the guide plate with the flue gas in the inlet flue, the flue gas entering the SCR denitrification reactor from the boiler tail flue is fully mixed, the flue gas flow rate and NOx distribution are adjusted, and at the same time it has a certain blocking effect on dust with large particle size, effectively solving the problems of flue and catalyst wear caused by uneven flue gas distribution and NOx emission substandard in the boiler tail flue gas, etc. However, when the guide plate blocks the dust, due to the influence of the rising power of the flue gas, the blocked dust will be adsorbed on the guide plate and difficult to fall off, which can easily cause the guide plate to be clogged due to excessive dust accumulation, resulting in the problem of affecting the passage of flue gas.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a thermal power generation desulfurization and denitrification equipment based on SCR technology, comprising an SCR denitrification reaction tank, wherein the bottom end of the side wall of one side of the SCR denitrification reaction tank is fixedly connected to a smoke inlet pipe, a catalyst bed is installed in the SCR denitrification reaction tank, a filter plate is installed below the catalyst bed in the SCR denitrification reaction tank, a cleaning component for preventing dust from accumulating on the filter plate is provided in the SCR denitrification reaction tank, the cleaning component comprises a forward and reverse motor fixedly connected to the bottom end of the SCR denitrification reaction tank, and the output end of the forward and reverse motor is fixedly connected to A rotating shaft is connected, and the end of the rotating shaft away from the forward and reverse motor passes through the SCR desulfurization reaction tank and is fixedly connected to a scraper, the top of the scraper is in contact with the lower surface of the filter screen, a rotating tube is sleeved on the rotating shaft, and a planetary gear assembly for controlling the rotation of the rotating tube is provided between the rotating shaft and the rotating tube, a connecting plate is fixedly connected to a side wall of one side of the rotating tube, and an arc-shaped sealing plate is fixedly connected to the end of the connecting plate away from the rotating tube, the arc-shaped sealing plate is in contact with the inner wall of the SCR desulfurization reaction tank, and the inner wall of the SCR desulfurization reaction tank is fixedly connected to a block on the side of the smoke inlet pipe.

[0007] Optionally, the planetary gear assembly includes a main gear fixedly connected to the rotating shaft, a gear ring fixedly connected to the inner wall of the rotating tube, and a plurality of slave gears are provided between the main gear and the gear ring, and the slave gears are all meshed with the main gear and the gear ring.

[0008] Optionally, the rotating shaft is located above the main gear and is fixedly connected to a fixed plate, the lower surface of the fixed plate is fixedly connected to an annular guide rail, a plurality of sliders are slidably connected in the annular guide rail, the lower surface of the slider is fixedly connected to a connecting rod, and the end of the connecting rod away from the slider is rotatably connected to the slave gear.

[0009] Optionally, a smoke conveying pipe is fixedly connected to the top of the side wall of one side of the SCR desulfurization reaction tank, and the end of the smoke conveying pipe away from the SCR desulfurization reaction tank is fixedly connected to a desulfurization tank, and the top of the desulfurization tank is fixedly connected to an annular water storage pipe at the top of the inner top of the desulfurization tank located above the smoke conveying pipe, and a plurality of spray heads are fixedly connected to the inner side wall of the annular water storage pipe, and a water pump is fixedly connected to the side wall of one side of the liquid storage tank, and the water pumping end of the water pump is located inside the liquid storage tank, and the water outlet end of the water pump is fixedly connected to a water pipe, and the end of the water pipe away from the water pump passes through the desulfurization tank and is fixedly connected to the annular water storage pipe.

[0010] Optionally, a fan is installed on the smoke conveying pipe.

[0011] Optionally, sealed bearings are provided at the upper and lower ends of the inner wall of the rotating tube, the sealed bearings are sleeved on the rotating shaft and are fixedly connected, and the outer wall of the sealed bearing is fixedly connected to the rotating tube.

[0012] Optionally, a protective cylinder is fixedly connected to the bottom of the SCR denitrification reaction tank, the rotating shaft is located in the protective cylinder, the bottom end of the rotating tube is fixedly connected to a circular baffle, and the top end of the protective cylinder is located on the circular baffle.

[0013] Optionally, the bottom end of the SCR denitration reaction tank is tilted, and a sealing block is threadedly connected to the bottom end of a side wall of one side of the SCR denitration reaction tank.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) The present application is provided with a coordinated arrangement between structures such as a forward and reverse motor, a scraper and an arc-shaped sealing plate. When in use, the forward and reverse motors are started to rotate the rotating shaft while the planetary gear assembly drives the rotating tube to rotate. When the rotating tube rotates, the connecting plate drives the arc-shaped sealing plate to rotate. When the arc-shaped sealing plate touches the block during rotation, the arc-shaped sealing plate can block the smoke inlet pipe to prevent smoke from continuing to enter the SCR destocking reaction tank. At the same time, the planetary gear assembly prevents the rotating tube from rotating while the rotating shaft continues to rotate, so that the scraper continues to scrape the filter screen plate, scraping off the dust adsorbed on the filter screen plate, and avoiding as much as possible the influence of the power of the rising smoke, which will cause the blocked dust to be adsorbed on the guide plate and difficult to fall off, and easily cause the guide plate to be clogged due to excessive dust accumulation, resulting in the problem of affecting the passage of smoke.

[0016] (2) The protective tube and the annular baffle can prevent the dust scraped off by the scraper from falling on the bottom of the SCR de-pinning reaction tank and contacting the rotating shaft, causing the dust to enter the gap between the rotating shaft and the SCR de-pinning reaction tank, jamming the rotating shaft, making it difficult to rotate the rotating shaft, and affecting the service life of the forward and reverse motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the planar structure of the utility model;

[0018] Figure 2 For the utility model Figure 1 Schematic diagram of the enlarged structure of area A in the middle;

[0019] Figure 3 For the utility model Figure 1 Schematic diagram of the enlarged structure of the middle B area;

[0020] Figure 4 This is a schematic diagram of the annular water storage pipe and spray head structure of the utility model.

[0021] Fig. 1, SCR reaction tank; 2, smoke inlet pipe; 3, catalyst bed; 4, filter screen; 5, forward and reverse motor; 6, rotating shaft; 7, scraper; 8, rotating pipe; 9, connecting plate; 10, arc-shaped sealing plate; 11, stop block; 12, main gear; 13, gear ring; 14, driven gear; 15, fixed disc; 16, annular guide rail; 17, sliding block; 18, connecting rod; 19, smoke conveying pipe; 20, desulfurization tank; 21, liquid storage tank; 22, annular water storage pipe; 23, spray head; 24, water pump; 25, water conveying pipe; 26, fan; 27, sealing bearing; 28, protective cylinder; 29, circular ring-shaped baffle; 30, sealing block. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Please refer to Figures 1-3 A flue desulfurization and denitrification equipment based on SCR technology, comprising an SCR desulfurization and denitrification tank 1, a smoke inlet pipe 2 fixedly connected to one side of the bottom end of the SCR desulfurization and denitrification tank 1 and used for conveying flue gas into the SCR desulfurization and denitrification tank 1, a catalyst bed 3 installed in the SCR desulfurization and denitrification tank 1 and used for desulfurizing the flue gas, a filter screen 4 installed below the catalyst bed 3 in the SCR desulfurization and denitrification tank 1 and used for filtering larger particles in the flue gas, a sealing cover arranged at the top end of the SCR desulfurization and denitrification tank 1 and threadedly connected to the top of the SCR desulfurization and denitrification tank 1, the catalyst bed 3 and the filter screen 4 in the SCR desulfurization and denitrification tank 1 can be disassembled and replaced by opening the sealing cover, and a cleaning assembly arranged in the SCR desulfurization and denitrification tank 1 and used for preventing dust from accumulating on the filter screen 4, the cleaning assembly comprising a forward and reverse motor 5, a rotating shaft 6, a scraper 7, a rotating pipe 8, a connecting plate 9, an arc-shaped sealing plate 10 and a stop block 11.

[0024] The forward and reverse motor 5 is fixedly connected to the bottom end of the SCR destocking reactor 1, one end of the rotating shaft 6 is fixedly connected to the output end of the forward and reverse motor 5, and the other end of the rotating shaft 6 passes through the SCR destocking reactor 1 and is located below the filter screen plate 4. The scraper 7 is fixedly connected to the end of the rotating shaft 6 away from the forward and reverse motor 5, and the top of the scraper 7 is in contact with the lower surface of the filter screen plate 4. The rotating tube 8 is sleeved on the rotating shaft 6, and a planetary gear assembly for controlling the rotation of the rotating tube 8 is provided between the rotating shaft 6 and the rotating tube 8. The connecting plate 9 is fixedly connected to the side wall of the rotating tube 8, and the arc-shaped sealing plate 10 is fixedly connected to the end of the connecting plate 9 away from the rotating tube 8. The arc-shaped sealing plate 10 is in contact with the inner wall of the SCR destocking reactor 1, and the stopper 11 is fixedly connected to the inner wall of the SCR destocking reactor 1 and is located on one side of the smoke inlet pipe 2.

[0025] For details, please refer to Figure 2 The planetary gear assembly includes a main gear 12 fixedly connected to the rotating shaft 6, a gear ring 13 is fixedly connected to the inner wall of the rotating tube 8, and a plurality of slave gears 14 are provided between the main gear 12 and the gear ring 13. The slave gears 14 are meshed with the main gear 12 and the gear ring 13. The main gear 12 is driven to rotate by the rotating shaft 6, so that the gear ring 13 can be driven to rotate during the rotation of the slave gear 14, so that the rotating tube 8 drives the arc-shaped sealing plate 10 to rotate. When the arc-shaped sealing plate 10 abuts against the block 11, the rotating tube 8 is difficult to rotate, so that the gear ring 13 stops rotating. When the rotating shaft 6 rotates, the slave gear 14 rotates around the main gear 12 during its own rotation, so that the rotating shaft 6 can continue to rotate, so that the scraper 7 continues to scrape the filter screen 4.

[0026] For details, please refer to Figure 2 The rotating shaft 6 is located above the main gear 12 and is fixedly connected to a fixed plate 15. The lower surface of the fixed plate 15 is fixedly connected to an annular guide rail 16. A plurality of sliders 17 are slidably connected in the annular guide rail 16. The lower surface of the slider 17 is fixedly connected to a connecting rod 18. The end of the connecting rod 18 away from the slider 17 is rotatably connected to the slave gear 14. The fixed plate 15, the annular guide rail 16, the slider 17 and the connecting rod 18 can fix the slave gear 14 to prevent it from falling between the main gear 12 and the gear ring 13.

[0027] For details, please refer to Figure 1 and Figure 4SCR reaction tank 1 side wall top fixedly connected with a smoke pipe 19, smoke pipe 19 away from the end of the SCR reaction tank 1 fixedly connected with a desulfurization tank 20, desulfurization tank 20 top fixedly connected with a liquid storage tank 21, liquid storage tank 21 top fixedly connected with a pipe for adding magnesium compound absorption liquid to the liquid storage tank 21, desulfurization tank 20 inside top fixedly connected with a ring-shaped water pipe 22, ring-shaped water pipe 22 inside wall fixedly connected with a plurality of spray heads 23, desulfurization tank 20 storage bottom fixedly connected with a drain pipe, desulfurization tank 20 side wall top fixedly connected with an exhaust pipe above the ring-shaped water pipe 22, liquid storage tank 21 side wall fixedly connected with a water pump 24, water pump 24 water pump end inside the liquid storage tank 21, water pump 24 water outlet fixedly connected with a water pipe 25, water pipe 25 away from the end of the water pump 24 and with the ring-shaped water pipe 22 fixedly connected, through the smoke pipe 19 can be sent to the SCR reaction tank 1 in the flue gas desulfurization tank 20, while starting the water pump 24 can be sprayed through the spray head 23 magnesium compound absorption liquid in the liquid storage tank 21, flue gas desulfurization.

[0028] Specifically, please refer to Figure 1 , the smoke pipe 19 is provided with a fan 26, which can improve the speed of flue gas from the smoke pipe 19 into the desulfurization tank 20.

[0029] Specifically, please refer to Figure 3 , the inner wall of the rotating pipe 8 is provided with sealing bearings 27 at the upper and lower ends, the sealing bearings 27 are sleeved on the rotating shaft 6 and are fixedly connected, the outer wall of the sealing bearings 27 is fixedly connected with the rotating pipe 8, the stability of the rotating pipe 8 can be improved through the sealing bearings 27, which can prevent the rotating pipe 8 from shaking and prevent dust from entering the rotating pipe 8.

[0030] Specifically, please refer to Figure 3 , the inside bottom of the SCR reaction tank 1 is fixedly connected with a protective cylinder 28, the rotating shaft 6 is located in the protective cylinder 28, the bottom end of the rotating pipe 8 is fixedly connected with a circular baffle 29, the top end of the protective cylinder 28 is located in the circular baffle 29, the protective cylinder 28 and the circular baffle 29 can prevent the dust scraped off by the scraper 7 from falling on the bottom of the SCR reaction tank 1 and contacting the rotating shaft 6, which can prevent the dust from entering the gap between the rotating shaft 6 and the SCR reaction tank 1 and causing the rotating shaft 6 to be stuck, which can affect the service life of the positive and negative motor 5.

[0031] Specifically, please refer to Figure 1The bottom end of the SCR reaction tank 1 is inclined, an opening for cleaning dust at the bottom end inside the SCR reaction tank 1 is arranged at the bottom end of the side wall of the SCR reaction tank 1, the sealing block 30 is threadedly connected to the opening of the SCR reaction tank 1, the sealing block 30 can be removed by rotating the sealing block 30, and the dust at the bottom end inside the SCR reaction tank 1 is conveniently cleaned.

[0032] Working principle: when in use, the forward and reverse motor 5 is started to rotate, the rotating shaft 6 rotates at the same time, the main gear 12 rotates, the driven gear 14 and the gear ring 13 are driven to rotate, the rotating pipe 8 rotates at the same time, the arc-shaped sealing plate 10 rotates, when the arc-shaped sealing plate 10 touches the stop block 11 in the rotating process, the arc-shaped sealing plate 10 can block the smoke inlet pipe 2, prevent the smoke from continuing to enter the SCR reaction tank 1, and the rotating pipe 8 cannot continue to rotate, so that the gear ring 13 stops rotating, when the gear ring 13 stops, the rotating shaft 6 continues to rotate, the main gear 12 drives the driven gear 14 to rotate around the main gear 12, the rotating shaft 6 can continue to rotate, the rotating shaft 6 drives the scraper 7 to continuously scrape the filter screen plate 4, and the dust adsorbed on the filter screen plate 4 is scraped and falls off, so that the problem that the dust adsorbed on the guide plate is difficult to fall off due to the influence of the power of the rising flue gas is avoided, the guide plate is blocked by too much dust, and the problem that the flue gas is affected is caused.

[0033] In addition, it should be noted that, in the description of the utility model, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0034] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A thermal power generation desulfurization and denitrification device based on SCR technology, comprising an SCR denitrification reaction tank (1), wherein a smoke inlet pipe (2) is fixedly connected to the bottom end of a side wall of one side of the SCR denitrification reaction tank (1), a catalyst bed (3) is installed in the SCR denitrification reaction tank (1), a filter screen (4) is installed below the catalyst bed (3) in the SCR denitrification reaction tank (1), and a cleaning component for preventing dust from accumulating on the filter screen (4) is provided in the SCR denitrification reaction tank (1), characterized in that: The cleaning assembly comprises a forward and reverse motor (5) fixedly connected to the bottom end of the SCR denitration reaction tank (1); the output end of the forward and reverse motor (5) is fixedly connected to a rotating shaft (6); one end of the rotating shaft (6) away from the forward and reverse motor (5) passes through the SCR denitration reaction tank (1) and is fixedly connected to a scraper (7); the top end of the scraper (7) is in contact with the lower surface of the filter screen (4); a rotating tube (8) is sleeved on the rotating shaft (6); the rotating shaft (6) and the filter screen (4) are connected to each other. A planetary gear assembly for controlling the rotation of the rotating tube (8) is provided between the rotating tubes (8); a connecting plate (9) is fixedly connected to a side wall of one side of the rotating tube (8); an arc-shaped sealing plate (10) is fixedly connected to an end of the connecting plate (9) away from the rotating tube (8); the arc-shaped sealing plate (10) is in contact with the inner wall of the SCR denitration reaction tank (1); and a stopper (11) is fixedly connected to the inner wall of the SCR denitration reaction tank (1) located on one side of the smoke inlet pipe (2).

2. The SCR-based thermal power generation desulfurization and denitrification equipment according to claim 1, characterized in that: The planetary gear assembly comprises a main gear (12) fixedly connected to the rotating shaft (6); a gear ring (13) is fixedly connected to the inner wall of the rotating tube (8); a plurality of slave gears (14) are provided between the main gear (12) and the gear ring (13); and the slave gears (14) are all meshed with the main gear (12) and the gear ring (13).

3. The SCR-based thermal power generation desulfurization and denitrification equipment according to claim 2, characterized in that: The rotating shaft (6) is located above the main gear (12) and is fixedly connected to a fixed plate (15); the lower surface of the fixed plate (15) is fixedly connected to an annular guide rail (16); a plurality of sliders (17) are slidably connected in the annular guide rail (16); the lower surface of the slider (17) is fixedly connected to a connecting rod (18); and one end of the connecting rod (18) away from the slider (17) is rotatably connected to the slave gear (14).

4. The SCR-based thermal power generation desulfurization and denitrification equipment according to claim 3, characterized in that: A smoke conveying pipe (19) is fixedly connected to the top of the side wall of the SCR desulfurization reaction tank (1), and the end of the smoke conveying pipe (19) away from the SCR desulfurization reaction tank (1) is fixedly connected to the desulfurization tank (20). The top of the desulfurization tank (20) is fixedly connected to a liquid storage tank (21). The top of the inner top of the desulfurization tank (20) is located above the smoke conveying pipe (19) and is fixedly connected to an annular water storage pipe (22). The inner side wall of the annular water storage pipe (22) is fixedly connected to a plurality of spray heads (23). A water pump (24) is fixedly connected to the side wall of the liquid storage tank (21). The water pumping end of the water pump (24) is located inside the liquid storage tank (21). The water outlet end of the water pump (24) is fixedly connected to a water conveying pipe (25). The end of the water conveying pipe (25) away from the water pump (24) passes through the desulfurization tank (20) and is fixedly connected to the annular water storage pipe (22).

5. The desulfurization and denitrification equipment for thermal power generation based on SCR technology according to claim 4, characterized in that: A fan (26) is installed on the smoke conveying pipe (19).

6. The desulfurization and denitrification equipment for thermal power generation based on SCR technology according to claim 5, characterized in that: Sealed bearings (27) are provided at the upper and lower ends of the inner wall of the rotating tube (8); the sealed bearings (27) are sleeved on the rotating shaft (6) and are fixedly connected; and the outer wall of the sealed bearing (27) is fixedly connected to the rotating tube (8).

7. The SCR technology-based thermal power generation desulfurization and denitrification equipment according to claim 6, characterized in that: A protective cylinder (28) is fixedly connected to the bottom end of the SCR denitration reaction tank (1), the rotating shaft (6) is located in the protective cylinder (28), the bottom end of the rotating tube (8) is fixedly connected to a circular baffle (29), and the top end of the protective cylinder (28) is located on the circular baffle (29).

8. The SCR-based thermal power generation desulfurization and denitrification equipment according to claim 7, characterized in that: The bottom end of the SCR denitration reaction tank (1) is arranged tilted, and a sealing block (30) is threadedly connected to the bottom end of a side wall of one side of the SCR denitration reaction tank (1).

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