A dry urea denitrification auxiliary feeding device

Abstract

This utility model discloses an auxiliary feeding device for dry urea denitrification, belonging to the field of flue gas denitrification technology. It includes a urea silo, a compressed air source, a telescopic pipe assembly, and a telescopic drive mechanism. The lower end of the urea silo is a conical feeding hopper, with a first air inlet connection and at least one feeding branch pipe at the outlet end. A second air inlet connection is connected to the feeding branch pipe. The compressed air source is connected to the first and second air inlet connections via a high-pressure air inlet pipe and a backflush pipe, respectively. The telescopic pipe assembly is correspondingly connected to the end of the feeding branch pipe. The telescopic drive mechanism drives the telescopic pipe assembly to contract or expand, causing the conical docking nozzle to separate or dock with the high-temperature flue. This utility model effectively removes urea powder from the inner wall of the feeding branch pipe through intermittent purging, preventing it from melting and agglomerating, reducing the frequency of pipe blockage, lowering maintenance costs, and improving the operational stability and denitrification efficiency of the denitrification system.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas denitrification technology, specifically relating to an auxiliary feeding device for dry urea denitrification, which is particularly suitable for preventing urea powder from clogging pipelines during the conveying process. Background Technology

[0002] Dry urea denitrification technology is widely used in high-temperature flue gas treatment in industrial boilers and kilns. Urea granules are fed into the high-temperature flue gas duct via a feeder, where they undergo a reduction reaction with nitrogen oxides to achieve denitrification. However, in actual operation, urea granules often contain a certain proportion of powdery material. This powder easily accumulates in the gaps of the corrugated feeding hose, melts under high temperatures, and then solidifies and clumps upon encountering cold air, leading to pipe blockage and affecting the continuous and stable operation of the denitrification system. Current technologies typically use continuous or timed compressed air to blow urea granules, but this is still insufficient to effectively remove the powder accumulated in the corrugated pipe gaps, resulting in frequent maintenance and high operating costs. Therefore, there is an urgent need for an auxiliary feeding device that can effectively prevent the accumulation and clumping of urea powder. Utility Model Content

[0003] Technical problem to be solved: In view of the technical problems existing in the background technology, this utility model provides a dry urea denitrification auxiliary feeding device to solve the problem that urea powder is easy to accumulate and clump in the corrugated pipe, causing blockage.

[0004] Technical solution: The present invention provides an auxiliary feeding device for dry urea denitrification, the feeding device comprising: A urea silo is connected to a urea feed pipe; the lower end of the urea silo is a conical feeding hopper, and the outlet end of the conical feeding hopper is provided with a first air inlet connection and at least one feeding branch pipe connected to the first air inlet connection. A pneumatic gate valve and a second air inlet connection are connected to the feeding branch pipe. The compressed air source is connected to the first air intake connection and the second air intake connection through a high-pressure air intake pipeline and a backflush pipeline, respectively, and the first air intake connection and the second air intake connection are respectively connected to an electric control valve. A telescopic pipe assembly is connected to the end of the feeding branch pipe, and a conical nozzle is provided at the end of the telescopic pipe assembly. The telescopic drive mechanism is configured in conjunction with the telescopic tube assembly, and drives the telescopic tube assembly to retract or expand, thereby causing the conical docking nozzle to separate or dock with the docking end provided on the high-temperature flue.

[0005] Preferably, the feeding device further includes a PLC control system, which is electrically connected to the electric control valves on the high-pressure air inlet pipeline and the backflush pipeline, respectively, and is used to control the electric valves to open periodically at set time intervals to realize air inlet feeding or intermittent purging of the feeding branch pipe.

[0006] Preferably, the purging frequency set by the PLC control system is once per minute.

[0007] Preferably, the purging gas provided by the compressed air source is room temperature compressed air.

[0008] Preferably, the first air intake connection and the second air intake connection are made of stainless steel or corrosion-resistant metal materials.

[0009] Preferably, the feeding branch pipe is a high-temperature resistant and corrosion-resistant metal corrugated pipe.

[0010] Preferably, the telescopic tube assembly includes several telescopic tube sections that are assembled together. The lower end of the inner telescopic tube section is provided with a first sealing and limiting ring, and the upper end of the outer telescopic tube section is provided with a second sealing and limiting ring. The second sealing and limiting ring is correspondingly engaged with the upper side of the first sealing and limiting ring.

[0011] Preferably, the conical nozzle is provided with a plurality of lifting roller groups in the circumferential direction; The telescopic drive mechanism includes a support base plate correspondingly disposed at the end of the feeding branch pipe. The support base plate is provided with a through hole for the telescopic pipe assembly to pass through, and the support base plate is located in the circumferential direction of the through hole and is respectively provided with guide roller groups corresponding to each hoisting roller group. The supporting base plate is equipped with a winding mechanism and a winding motor. Multiple traction cables are wound on the winding mechanism, and each traction cable passes around the guide roller group and is connected to the corresponding lifting roller group for transmission.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects: 1. This utility model effectively removes urea powder from the inner wall of the feed branch pipe through intermittent purging, preventing it from melting and caking, reducing the frequency of pipe blockage, lowering maintenance costs, and improving the operational stability and denitrification efficiency of the denitrification system; 2. The system is equipped with a telescopic tube assembly and a corresponding telescopic drive mechanism. The telescopic drive mechanism controls the expansion or contraction of the telescopic tube assembly, thereby enabling the conical nozzle to dock with or separate from the high-temperature flue, and meeting the maintenance needs of the high-temperature flue or feeding device. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the auxiliary feeding device of this utility model (the telescopic tube is in the disengaged state); Figure 2 for Figure 1 Schematic diagram of the auxiliary feeding device (telescopic pipe in docking state); Figure 3 for Figure 1 Schematic diagram of the telescopic tube in its retracted state; Figure 4 for Figure 2 Schematic diagram of the telescopic tube in its deployed state; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A in the middle.

[0014] Reference numerals: 100, feeding device; 1, urea silo; 2, urea feed pipe; 3, conical hopper; 4, first air inlet connection; 5, pneumatic gate valve; 6, second air inlet connection; 7, feeding branch pipe; 8. Telescopic drive mechanism; 81. Support base plate; 82. Guide roller group; 83. Traction cable; 84. Winding motor; 85. Winding mechanism; 9. Telescopic tube assembly; 91. First tube section; 92. Second tube section; 93. Third tube section; 94. First sealing limit ring; 95. Second sealing limit ring; 96. Locking screw; 10. Conical nozzle; 11. High-temperature flue; 12. Docking end; 13. Compressed air source; 14. High-pressure air inlet pipeline; 15. Backflush pipeline; 16. Lifting roller assembly. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings. Figures 1-5 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0016] like Figures 1-2As shown, this utility model discloses a dry urea denitrification auxiliary feeding device. The feeding device 100 includes a urea silo 1, a compressed air source 13, a telescopic pipe assembly 9, and a telescopic drive mechanism 8. The urea silo 1 is connected to a urea feed pipe 2, through which urea powder is added to the urea silo 1. The lower end of the urea silo 1 is a conical feeding hopper 3. The outlet end of the conical feeding hopper 3 is provided with a first air inlet connection part 4 and at least one feeding branch pipe 7 correspondingly connected to the first air inlet connection part 4. The feeding branch pipe 7 is a high-temperature resistant and corrosion-resistant metal corrugated pipe. A pneumatic gate valve 5 and a second air inlet connection part 6 are connected to the feeding branch pipe 7. The compressed air source 13 is connected to the first air inlet connection part 4 and the second air inlet connection part 6 respectively through a high-pressure air inlet pipe 14 and a backflush pipe 15, and the first air inlet connection part 4 and the second air inlet connection part 6 are respectively connected to an electric control system. The valve, the first air inlet connection 4, and the second air inlet connection 6 are made of stainless steel or corrosion-resistant metal materials; the compressed air source 13 provides high-pressure air to the feed branch pipe 7 through the high-pressure air inlet pipeline 14 and the first air inlet connection 4 to realize the feeding and conveying of urea powder; or the compressed air source 13 realizes the intermittent purging of the feed branch pipe 7 through the backflush pipeline 15 and the second air inlet connection 6 to effectively remove the urea powder on the inner wall of the feed branch pipe, prevent it from melting and agglomerating, reduce the frequency of pipe blockage, and reduce maintenance costs; improve the operational stability and denitrification efficiency of the denitrification system.

[0017] like Figures 3-5 As shown, the telescopic pipe assembly 9 is connected to the end of the feed branch pipe 7, and a conical nozzle 10 is correspondingly provided at the end of the telescopic pipe assembly 9. The telescopic pipe assembly 9 includes multiple telescopic pipe sections. The lower end of the inner telescopic pipe section is provided with a first sealing limiting ring 94, and the upper end of the outer telescopic pipe section is provided with a second sealing limiting ring 95. The second sealing limiting ring 95 is correspondingly snapped onto the upper side of the first sealing limiting ring 94. In a specific embodiment, the telescopic pipe assembly 9 includes a first pipe section 91 fixedly connected to the end of the feed branch pipe 7 through a connecting flange, and a second pipe section 92, a third pipe section 93, a fourth pipe section, a fifth pipe section, etc., which are sequentially installed. The specific number is set according to the requirements. Taking the connection between the second pipe section 92 and the third pipe section 93 as an example (e.g.) Figure 5 As shown, a first sealing and limiting ring 94 is provided on the outer periphery of the lower end of the second pipe section 92, and a second sealing and limiting ring 95 is provided on the inner wall of the upper end of the third pipe section 93. The second sealing and limiting ring 95 and the third pipe section 93 are assembled and connected by locking screws 96 to meet the assembly requirements of adjacent pipe sections. The second sealing and limiting ring 95 can be used to prevent the third pipe section 93 from falling off the lower end of the second pipe section 92; and the cooperation of the first sealing and limiting ring 94 and the second sealing and limiting ring 95 can achieve a sealed connection between adjacent pipe sections.

[0018] like Figures 3-4As shown, the telescopic drive mechanism 8 is configured to cooperate with the telescopic tube assembly 9, and drives the telescopic tube assembly 9 to retract or expand, thereby causing the conical docking nozzle 10 to separate or dock with the docking end 12 provided on the high-temperature flue 11. Specifically, the conical docking nozzle 10 is provided with multiple lifting roller groups 16 in the circumferential direction; The telescopic drive mechanism 8 includes a support base plate 81 correspondingly disposed at the end of the feeding branch pipe 7. The support base plate 81 is provided with a through hole for the telescopic pipe assembly 9 to pass through, and the support base plate 81 is located on a guide roller group 82 corresponding to each lifting roller group 16 in the circumferential direction of the through hole. A winding mechanism 85 is provided on the support base plate 81, and a winding motor 84 is provided in cooperation with the winding mechanism 85. Multiple traction cables 83 are wound on the winding mechanism 85, and each traction cable 83 passes around the guide roller group 82 and is connected to the corresponding lifting roller group 16. The winding mechanism 85 can be equipped with a winch according to the number of traction cables 83. The winding motor 84 drives the winding mechanism 85 to rotate forward and backward, thereby driving the traction cables 83 to realize the extension or retraction control of the telescopic pipe assembly 9, so as to meet the docking or separation of the conical docking nozzle and the high-temperature flue, and meet the maintenance needs of the high-temperature flue or feeding device.

[0019] The feeding device also includes a PLC control system (not shown in the figure). The PLC control system is electrically connected to the electric control valves on the high-pressure air inlet pipe 14 and the backflush pipe 15, respectively, to control the electric valves to open periodically at set time intervals, thereby realizing air intake feeding or intermittent purging of the feeding branch pipe. The purging frequency set by the PLC control system is once per minute, and the duration of each purging is 1-3 seconds. The purging gas provided by the compressed air source 13 is ambient temperature compressed air.

[0020] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A dry urea denitrification auxiliary feeding device, characterized in that, The feeding device (100) includes: Urea silo (1), the urea silo (1) is connected to the urea feed pipe (2); the lower end of the urea silo (1) is a conical feed hopper (3), the outlet end of the conical feed hopper (3) is provided with a first air inlet connection part (4) and at least one feed branch pipe (7) correspondingly connected to the first air inlet connection part (4), and a pneumatic gate valve (5) and a second air inlet connection part (6) are connected in the feed branch pipe (7); Air source (13), the air source (13) is connected to the first air intake connection (4) and the second air intake connection (6) respectively through the high pressure air intake pipeline (14) and the backflush pipeline (15), and the first air intake connection (4) and the second air intake connection (6) are respectively connected to the electric control valve; Telescopic pipe assembly (9), the telescopic pipe assembly (9) is connected to the end of the feed branch pipe (7), and the end of the telescopic pipe assembly (9) is provided with a conical nozzle (10). Telescopic drive mechanism (8) is configured in conjunction with telescopic tube assembly (9), and drives telescopic tube assembly (9) to contract or expand to drive conical docking nozzle (10) to separate or dock with docking end (12) provided on high temperature flue (11).

2. The dry urea denitrification auxiliary feeding device according to claim 1, characterized in that, The feeding device also includes a PLC control system, which is electrically connected to the electric control valves on the high-pressure air inlet pipe (14) and the backflush pipe (15) respectively. The PLC control system is used to control the electric valves to open periodically at a set time interval to realize air inlet feeding or intermittent purging of the feeding branch pipe.

3. The dry urea denitrification auxiliary feeding device according to claim 2, characterized in that, The purging frequency set by the PLC control system is once per minute.

4. The dry urea denitrification auxiliary feeding device according to claim 1, characterized in that, The purge gas provided by the compressed air source (13) is room temperature compressed air.

5. The dry urea denitrification auxiliary feeding device according to claim 1, characterized in that, The first air intake connection part (4) and the second air intake connection part (6) are made of stainless steel or corrosion-resistant metal materials.

6. The dry urea denitrification auxiliary feeding device according to claim 1, characterized in that, The feed branch pipe (7) is a high-temperature resistant and corrosion-resistant metal corrugated pipe.

7. The dry urea denitrification auxiliary feeding device according to any one of claims 1-6, characterized in that, The telescopic tube assembly (9) includes several telescopic tube sections. The lower end of the inner telescopic tube section is provided with a first sealing limit ring (94), and the upper end of the outer telescopic tube section is provided with a second sealing limit ring (95). The second sealing limit ring (95) is correspondingly snapped onto the upper side of the first sealing limit ring (94).

8. The dry urea denitrification auxiliary feeding device according to claim 7, characterized in that, The conical nozzle (10) is circumferentially provided with several lifting roller groups (16). The telescopic drive mechanism (8) includes a support base plate (81) correspondingly disposed at the end of the feed branch pipe (7). The support base plate (81) is provided with a through hole for the telescopic pipe assembly (9) to pass through, and the support base plate (81) is located in the circumferential direction of the through hole and is respectively provided with guide roller groups (82) corresponding to each hoisting roller group (16). A winding mechanism (85) is provided on the support base plate (81), and a winding motor (84) is provided in cooperation with the winding mechanism (85); multiple traction cables (83) are wound on the winding mechanism (85), and each traction cable (83) passes around the guide roller group (82) and is connected to the corresponding hoisting roller group (16) for transmission.

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