Low-temperature SCR (Selective Catalytic Reduction) denitration device

Abstract

The utility model provides a low-temperature SCR (Selective Catalytic Reduction) denitration device which comprises a heat absorption pipe, a gas guide disc, a blowing fan blade and a transmission blade, the blowing fan blade is arranged at the right end of a transmission shaft, the transmission blade is arranged on the annular side surface of the transmission shaft, and the heat absorption pipe is fixedly connected to the lower side in a denitration box body. A denitration additive solution flowing in the flow guide volute can push transmission blades to rotate, so that the transmission blades drive blowing fan blades to rotate through a transmission shaft so as to supply air to the interior of an air guide disc, and the air guide disc can distribute air blown by the blowing fan blades into a plurality of heat absorption pipes so as to ventilate and cool heat absorbed by the heat absorption pipes; therefore, the plurality of heat absorption pipes continuously absorb heat and cool the denitration additive solution in the denitration box body, and the denitration effect of the denitration additive solution is prevented from being influenced by over-high temperature generated by heat accumulation of the denitration additive solution.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas denitration treatment, in particular to a low-temperature SCR denitration device. Background Art

[0002] Flue gas is one of the main emissions from thermal power plants. It is produced by the combustion of combustibles in a burner (i.e., boiler). Flue gas usually contains a large amount of nitrogen oxides. If these nitrogen oxides are directly discharged into the atmosphere, they will cause highly corrosive acid rain. Therefore, flue gas must be denitrified (i.e., denitrified) before discharge. The current common treatment method is SCR selective catalytic reduction denitrification technology, which has no by-products and will not produce secondary pollution. The device has a simple structure, high removal efficiency, reliable operation, and easy maintenance.

[0003] Publication number "CN217248021U" provides a low-temperature SCR catalytic flue gas denitrification device. The control valve is opened to introduce the cleaning agent and water into the interior of the cleaning ring through a hose, and then the cleaning agent and water are guided to the surface of the cleaning brush through the liquid outlet hole on the cleaning ring. The cleaning agent reacts and neutralizes the pollutants on the inner wall of the denitrification tank in real time, so that the pollutant attachments can fall off more quickly, resulting in a better cleaning effect.

[0004] However, the above technical solutions and the prior art have the following defects:

[0005] The low-temperature SCR catalytic flue gas denitrification device has a simple internal structure and cannot effectively denitrify the flue gas during actual use. In order to reduce costs, the wet denitrification structure in the denitrification device in the prior art mostly adopts a circulating spraying method to use a denitrification additive solution, but no corresponding ventilation and cooling structure is set, resulting in the denitrification additive solution being easily heat-accumulated and over-temperatured. The denitrification effect of a denitrification additive solution with a temperature that is too high will be greatly reduced. Utility Model Content

[0006] The purpose of the utility model is to provide a low-temperature SCR denitration device to solve the problems raised in the above background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A low-temperature SCR denitration device comprises a denitration box, a smoke exhaust pipe, a box cover, a sealing baffle, a drain valve, a liquid replenishing valve and a smoke inlet pipe, wherein the box cover is installed on the upper end face of the denitration box, the upper side of the right end face of the denitration box is connected to the smoke exhaust pipe, the lower side of the right end face of the denitration box is connected to the smoke inlet pipe, the front end face of the denitration box is installed with a sealing baffle, a denitration component for denitrifying flue gas is arranged on the upper side of the denitration box, a ventilation and cooling component for cooling the denitration liquid in the denitration component is arranged on the lower side of the denitration box, a liquid replenishing valve is installed on the right end face of the denitration box, and a drain valve is installed on the lower side of the right end face of the denitration box.

[0009] Preferably, the denitrification component includes a guide pipe, a spray head, a diverter pipe, a liquid passing pipe, a guide volute, a liquid inlet pipe and a high-temperature resistant water pump. A high-temperature resistant water pump is installed on the lower side of the left end surface of the denitrification box, the outlet of the high-temperature resistant water pump is connected to the liquid inlet pipe, the upper end of the liquid inlet pipe is connected to the guide volute, the upper end of the guide volute is connected to the liquid passing pipe, the upper end of the liquid passing pipe is fixedly connected to the diverter pipe, the right side of the annular side of the diverter pipe is fixedly connected to the guide pipe, and the lower side of the annular side of the guide pipe is provided with a spray head.

[0010] Preferably, the ventilation and cooling assembly includes a heat absorption pipe, an air guide plate, a blowing fan blade, a transmission shaft and a transmission blade. The transmission shaft is installed inside the guide volute, the blowing fan blade is installed on the right end of the transmission shaft, and the transmission blade is arranged on the annular side of the transmission shaft. The heat absorption pipe is fixedly connected to the lower side of the denitrification box, and the air guide plate is fixedly connected to the left end of the heat absorption pipe.

[0011] Preferably, a volute cover is installed on the right end face of the guide volute, a mechanical seal is provided on the inner wall of the volute cover, a plurality of guide pipes are fixedly connected, and the plurality of guide pipes have the same specifications, and the plurality of guide pipes are evenly connected to each other through diversion pipes.

[0012] Preferably, a denitration filter plate is placed on the lower side of the denitration box, and a flat-plate denitration catalyst is installed on the upper side of the denitration box.

[0013] Preferably, a limit ring is provided on the right side of the annular side of the transmission shaft, the transmission blades match the guide volute, a plurality of heat absorption tubes are fixedly connected, and the plurality of heat absorption tubes have the same specifications, and the plurality of heat absorption tubes are all connected to the air guide disk.

[0014] Preferably, the inlet of the refill valve is connected to the outlet of the external denitrification additive solution storage tank through a pipeline, the outlet of the drain valve is connected to the inlet of the external wastewater treatment tank through a pipeline, and the box cover and the sealing baffle are both detachable structures.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. In the process of denitrification of flue gas in the denitrification box by the denitrification component, the denitrification additive solution flowing inside the guide volute will drive the transmission blades to rotate, so that the transmission blades drive the fan blades to rotate through the transmission shaft to supply air to the inside of the air guide disk, and the air guide disk will divert the air blown by the fan blades to multiple heat absorption pipes to ventilate and cool the heat adsorbed by them, so that the multiple heat absorption pipes can continuously absorb heat and cool the denitrification additive solution inside the denitrification box, so as to avoid the denitrification additive solution from being overheated due to heat accumulation and affecting its own denitrification effect;

[0017] 2. The utility model uses a high temperature resistant water pump to pump the denitrification additive solution in the denitrification box into the liquid inlet pipe, and the liquid inlet pipe will guide the denitrification additive solution to the liquid flow pipe through the guide volute, and finally the liquid flow pipe will shunt the denitrification additive solution to multiple guide pipes through the shunt pipe, so that multiple spray heads can spray the denitrification additive solution downward to oxidize the flue gas entering the denitrification box for primary denitrification, and the flue gas after the primary denitrification will continue to move upward and be denitrified for the second time by the flat denitrification catalyst, thereby effectively denitrifying the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 It is a structural diagram of the denitration component and the ventilation and cooling component in the utility model;

[0020] Figure 3 It is a front cross-sectional view of the denitration component and the ventilation and cooling component in the utility model;

[0021] Figure 4 It is a structural diagram of the transmission shaft, transmission blades and fan blades in the utility model;

[0022] Figure 5 It is a structural diagram of the flow guide pipe, the flow distribution pipe and the liquid passing pipe in the utility model;

[0023] Figure 6 for Figure 3 A partial enlarged view of .

[0024] In the figure: 1. Denitrification box; 2. Smoke exhaust pipe; 3. Box cover; 4. Denitrification component; 41. Guide pipe; 42. Spray head; 43. Diverter pipe; 44. Liquid passing pipe; 45. Guide volute; 451. Volute cover; 452. Mechanical seal; 46. Liquid inlet pipe; 47. High temperature resistant water pump; 48. Flat denitrification catalyst; 49. De-impurity filter plate; 5. Sealing baffle; 6. Ventilation and cooling component; 61. Heat absorption pipe; 62. Air guide plate; 63. Blowing fan blades; 64. Transmission shaft; 641. Limiting ring; 65. Transmission blades; 7. Drain valve; 8. Liquid replenishment valve; 9. Smoke inlet pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-6 , the utility model provides a technical solution:

[0027] Embodiment 1:

[0028] A low-temperature SCR denitrification device comprises a denitrification box 1, a smoke exhaust pipe 2, a box cover 3, a sealing baffle 5, a drain valve 7, a liquid replenishing valve 8 and a smoke inlet pipe 9. The upper end surface of the denitrification box 1 is installed with a box cover 3, and the box cover 3 is a detachable structure. The detachable box cover 3 is convenient for later staff to perform maintenance and repair on the upper side of the interior of the denitrification box 1. The upper side of the right end surface of the denitrification box 1 is connected with a smoke exhaust pipe 2, and the smoke exhaust pipe 2 will guide the denitrified flue gas in the denitrification box 1 to the next process. The lower side of the right end surface of the denitrification box 1 is connected with a smoke inlet pipe 9, and the smoke inlet pipe 9 will guide the flue gas into the denitrification box 1 for denitrification treatment. The front end surface of the denitrification box 1 is installed with a sealing baffle 5, and the sealing baffle 5 is a detachable structure. The detachable sealing baffle 5 is convenient for later staff to clean and maintain the impurity removal filter plate 49 on the lower side of the interior of the denitrification box 1.

[0029] A denitrification component 4 for denitrifying flue gas is arranged on the upper side of the denitrification box 1, a ventilation and cooling component 6 for cooling the denitrification liquid in the denitrification component 4 is arranged on the lower side of the denitrification box 1, a refilling valve 8 is installed on the right end face of the denitrification box 1, and the inlet of the refilling valve 8 is connected with the outlet of the external denitrification additive solution storage tank through a pipeline. The refilling valve 8 is convenient for replenishing the denitrification additive into the denitrification box 1, and a drain valve 7 is installed on the lower side of the right end face of the denitrification box 1. The outlet of the drain valve 7 is connected with the inlet of the external wastewater treatment tank through a pipeline. The drain valve 7 is convenient for discharging the denitrification additive inside the denitrification box 1 for replacement.

[0030] The denitration component 4 includes a guide pipe 41, a spray head 42, a shunt pipe 43, a liquid flow pipe 44, a guide volute 45, a liquid inlet pipe 46 and a high temperature resistant water pump 47. A high temperature resistant water pump 47 is installed on the lower side of the left end surface of the denitration box 1. The high temperature resistant water pump 47 will pump the denitration additive inside the denitration box 1 into the liquid inlet pipe 46. The outlet of the high temperature resistant water pump 47 is connected to the liquid inlet pipe 46. The liquid inlet pipe 46 will guide the denitration additive to the guide volute 45. The upper end of the liquid inlet pipe 46 is connected to the guide volute 45. The guide volute 45 will guide the denitration additive to the liquid flow pipe 44. The upper end of the guide volute 45 is connected to the liquid flow pipe 44. The liquid passing pipe 44 will guide the denitration additive to the shunt pipe 43. The upper end of the liquid passing pipe 44 is fixedly connected with the shunt pipe 43. The shunt pipe 43 is connected to the liquid passing pipe 44 and the guide pipe 41 by welding. The shunt pipe 43 will shunt the denitration additive to multiple guide pipes 41. The right side of the annular side of the shunt pipe 43 is fixedly connected with the guide pipe 41. The guide pipe 41 is connected to the denitration box 1 by welding. There are multiple guide pipes 41 fixedly connected, and the specifications of the multiple guide pipes 41 are the same. The multiple guide pipes 41 are evenly connected with the shunt pipe 43. The guide pipe 41 will guide the denitration additive to the spray head 42.

[0031] A spray head 42 is arranged at the lower side of the annular side of the guide pipe 41, and a plurality of spray heads 42 are arranged, and the specifications of the plurality of spray heads 42 are the same. The plurality of spray heads 42 will spray the denitration additives in the plurality of guide pipes 41 downwardly, so that the denitration additives can react with the flue gas entering the denitration box 1 for oxidation to perform a denitration. A volute cover 451 is installed on the right end face of the guide volute 45, and the volute cover 451 is a detachable structure. The detachable volute cover 451 is convenient for the later maintenance personnel to maintain the inside of the guide volute 45. A sealing ring is arranged between the volute cover 451 and the guide volute 45, and the sealing ring makes the sealing between the volute cover 451 and the guide volute 45 better. A mechanical seal 452 is provided on the inner wall of the shell cover 451, and the mechanical seal 452 is matched with the transmission shaft 64. The mechanical seal 452 makes the sealing between the transmission shaft 64 and the volute cover 451 better. A de-impurity filter plate 49 is placed on the lower side of the de-impurity box. The de-impurity filter plate 49 will block the insoluble impurities falling down in the flue gas to prevent the high-temperature resistant water pump 47 from being easily blocked. A flat-plate de-impurity catalyst 48 is installed on the upper side of the de-impurity box. The flat-plate de-impurity catalyst 48 will perform secondary de-impurity on the passing flue gas. Since the detailed structure and working principle of the flat-plate de-impurity catalyst 48 are relatively mature technologies in the prior art, they will not be elaborated here.

[0032] Embodiment 2:

[0033] On the basis of Example 1, in this embodiment, the denitrification additive solution flowing inside the guide volute 45 drives the transmission blades 65 to rotate, so that the transmission blades 65 drive the blowing fan blades 63 to rotate through the transmission shaft 64 to supply air to the inside of the air guide plate 62, and the air guide plate 62 will divert the air blown by the blowing fan blades 63 to the multiple heat absorption tubes 61 to ventilate and cool the heat adsorbed therein, so that the multiple heat absorption tubes 61 can continuously absorb heat and cool the denitrification additive solution inside the denitrification box 1.

[0034] The ventilation and cooling component 6 includes a heat absorption pipe 61, an air guide plate 62, a blowing fan blade 63, a transmission shaft 64 and a transmission blade 65. The transmission shaft 64 is installed inside the guide volute 45, and the transmission shaft 64 is connected to the transmission blade 65 and the limit ring 641 by welding. The transmission shaft 64 will drive the blowing fan blade 63 to rotate. The right end of the transmission shaft 64 is installed with a blowing fan blade 63. When the blowing fan blade 63 rotates, it will send air to the right side. The annular side of the transmission shaft 64 is provided with a transmission blade 65. The transmission blade 65 matches the guide volute 45. The transmission blade 65 will drive the transmission shaft 64 to rotate under the impact of the water flow of the guide volute 45. The lower side of the denitrification box 1 is fixedly connected with the heat absorption pipe 61. The heat absorption pipe 61 and the guide volute 45 are connected to the guide volute 45. The gas disk 62 and the denitration box 1 are connected by welding, and multiple heat absorption tubes 61 are fixedly connected, and the multiple heat absorption tubes 61 have the same specifications. The multiple heat absorption tubes 61 are all connected to the air guide disk 62. The multiple heat absorption tubes 61 will absorb heat and cool the denitration additive on the lower side of the denitration box 1. The left end of the heat absorption tube 61 is fixedly connected to the air guide disk 62, and the air guide disk 62 will divert the air blown by the fan blades 63 to the multiple heat absorption tubes 61. A limiting ring 641 is set on the right side of the annular side of the transmission shaft 64, and a limiting stop cover is installed in the middle position of the right end face of the volute cover 451. The limiting stop cover and the limiting ring 641 will limit the transmission shaft 64 to prevent the transmission shaft 64 from shaking or displacement during rotation.

[0035] Working principle: the staff first opens the liquid replenishing valve 8 to inject an appropriately configured denitrification additive solution into the denitrification box 1, and then starts the high-temperature resistant water pump 47, so that the high-temperature resistant water pump 47 pumps the denitrification additive solution inside the denitrification box 1 into the liquid inlet pipe 46, and the liquid inlet pipe 46 will divert the denitrification additive solution to the guide volute 45, at this time the guide volute 45 will divert the denitrification additive solution through the liquid pipe 44 to the diversion pipe 43, at this time the diversion pipe 43 will divert the denitrification additive solution to multiple guide pipes 41, so that the multiple guide pipes 41 divert the denitrification additive solution to multiple spray heads 42, so that the multiple spray heads 42 spray the denitrification additive solution downward to oxidize the flue gas entering the denitrification box 1 for a primary denitrification, and the flue gas after the primary denitrification will continue to move upward and be denitrified by the flat-plate denitrification catalyst 48 for a secondary denitrification, and finally the flue gas after the secondary denitrification will enter the exhaust pipe 2 is guided to the next process for treatment. At the same time, the sprayed denitration additive solution will fall downward and be filtered by the impurity removal filter plate 49 to block the insoluble matter adhering to the denitration additive solution, and the filtered denitration additive solution will fall to the lower side of the denitration box 1 again for recycling; at the same time, the denitration additive solution flowing in the guide volute 45 will drive the transmission blades 65 to rotate, so that the transmission blades 65 drive the fan blades 63 to rotate through the transmission shaft 64, so that the rotating fan blades 63 can supply air to the inside of the air guide plate 62, and the air guide plate 62 will divert the air blown by the fan blades 63 to the multiple heat absorption tubes 61, so as to ventilate and cool the heat absorbed by the multiple heat absorption tubes 61, so that the multiple heat absorption tubes 61 can continuously absorb heat and cool the denitration additive solution inside the denitration box 1, so as to avoid the denitration additive solution from being overheated due to heat accumulation and affecting its own denitration effect.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature SCR denitration device, comprising a denitration box (1), a smoke exhaust pipe (2), a box cover (3), a sealing baffle (5), a drain valve (7), a liquid replenishment valve (8) and a smoke inlet pipe (9), characterized in that: The upper end surface of the denitrification box (1) is provided with a box cover (3); the upper side of the right end surface of the denitrification box (1) is connected to a smoke exhaust pipe (2); the lower side of the right end surface of the denitrification box (1) is connected to a smoke inlet pipe (9); the front end surface of the denitrification box (1) is provided with a sealing baffle (5); the upper side of the interior of the denitrification box (1) is provided with a denitrification component (4) for denitrifying flue gas; the lower side of the interior of the denitrification box (1) is provided with a ventilation and cooling component (6) for cooling the denitrification liquid in the denitrification component (4); the right end surface of the denitrification box (1) is provided with a liquid replenishing valve (8); and the lower side of the right end surface of the denitrification box (1) is provided with a liquid drain valve (7).

2. A low-temperature SCR denitration device according to claim 1, characterized in that: The denitration component (4) comprises a guide pipe (41), a spray head (42), a shunt pipe (43), a liquid passage pipe (44), a guide volute (45), a liquid inlet pipe (46) and a high temperature resistant water pump (47). A high temperature resistant water pump (47) is installed on the lower side of the left end surface of the denitration housing (1). The outlet of the high temperature resistant water pump (47) is connected to the liquid inlet pipe (46). The upper end of the liquid inlet pipe (46) is connected to the guide volute (45). The upper end of the guide volute (45) is connected to the liquid passage pipe (44). The upper end of the liquid passage pipe (44) is fixedly connected to the shunt pipe (43). The right side of the annular side surface of the shunt pipe (43) is fixedly connected to the guide pipe (41). The lower side of the annular side surface of the guide pipe (41) is provided with a spray head (42).

3. A low-temperature SCR denitration device according to claim 2, characterized in that: The ventilation and cooling component (6) comprises a heat absorption pipe (61), an air guide plate (62), a blowing fan blade (63), a transmission shaft (64) and a transmission blade (65); the transmission shaft (64) is installed inside the guide volute (45); the blowing fan blade (63) is installed at the right end of the transmission shaft (64); the transmission blade (65) is arranged on the annular side surface of the transmission shaft (64); the heat absorption pipe (61) is fixedly connected to the lower side of the denitration box (1); and the air guide plate (62) is fixedly connected to the left end of the heat absorption pipe (61).

4. A low-temperature SCR denitration device according to claim 2, characterized in that: A volute cover (451) is installed on the right end surface of the flow guide volute (45), and a mechanical seal (452) is arranged on the inner wall of the volute cover (451). A plurality of flow guide pipes (41) are fixedly connected, and the plurality of flow guide pipes (41) have the same specifications. The plurality of flow guide pipes (41) are connected to a uniform flow distribution pipe (43).

5. A low-temperature SCR denitration device according to claim 1, characterized in that: A denitration filter plate (49) is placed on the lower side of the denitration box, and a flat-plate denitration catalyst (48) is installed on the upper side of the denitration box.

6. A low-temperature SCR denitration device according to claim 3, characterized in that: A limit ring (641) is provided on the right side of the annular side of the transmission shaft (64); the transmission blade (65) matches the guide volute (45); a plurality of heat absorption tubes (61) are fixedly connected, and the plurality of heat absorption tubes (61) have the same specifications; and the plurality of heat absorption tubes (61) are all connected to the air guide disk (62).

7. A low-temperature SCR denitration device according to claim 1, characterized in that: The inlet of the refill valve (8) is connected to the outlet of the external denitration additive solution storage tank through a pipeline, and the outlet of the drain valve (7) is connected to the inlet of the external wastewater treatment tank through a pipeline. The box cover (3) and the sealing baffle (5) are both detachable structures.

Images