Anti-clogging boiler flue gas denitration device

Abstract

The utility model discloses a kind of anti-clogging boiler flue gas denitrification devices, it is related to flue gas denitrification device technical field, the anti-clogging boiler flue gas denitrification device, including denitration tower, the smoke inlet end of the denitration tower is connected with the smoke outlet end of boiler by smoke inlet pipe, denitration tower smoke outlet end is connected with the smoke pipe of elbow pipe shape, sweeping pipe is equipped in the outside of the bending section of smoke pipe, a plurality of sweeping head distributed along circumference is installed on sweeping pipe, each sweeping head is inserted into the inside of smoke pipe and is inclined to the wall of pipe and is arranged, for the directional sweeping of elbow pipe inner wall, ash outlet is set in the inside bottom of the bending section of smoke pipe, ash outlet is sealed and closed by detachable arc sealing plate, for discharging accumulated dust and reaction product.The utility model is by being provided with sweeping structure, ash outlet, zoning heating, helical flow guide vane and expansion smoke pipe, prevent from blocking, prevent from condensing, flow guide and steady flow are integrated in one, effectively promote the operation stability of boiler flue gas denitrification device.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas denitrification devices, and in particular to an anti-clogging boiler flue gas denitrification device. Background Technology

[0002] In boiler flue gas denitrification systems, the exhaust pipes at the outlet of the denitrification tower are often blocked due to the deposition of dust, unreacted absorbent, and reaction products (such as ammonium sulfate and ammonium nitrate) carried by the flue gas in areas prone to ash accumulation, such as bends. Especially during low-load operation or start-up and shutdown, the flue gas temperature drops, causing acidic components to condense and precipitate, further aggravating the risk of scaling.

[0003] Traditional flue gas pipes have a relatively simple structure and lack effective anti-clogging and dust removal designs. Dust and reaction products in the flue gas tend to accumulate in dead zones such as bends, leading to increased system resistance and back pressure. In severe cases, this can cause pipe blockage or even shutdown. Although existing technologies use local heating or manual dust removal to alleviate the blockage problem, these methods often require disassembling the flue gas pipe for cleaning, making online maintenance difficult. The operation is cumbersome, time-consuming, and labor-intensive, making it difficult to meet the requirements for long-term, continuous, and stable operation of denitrification systems. Utility Model Content

[0004] The purpose of this utility model is to provide an anti-clogging boiler flue gas denitrification device, which can effectively avoid pipe blockage caused by the deposition and condensation of dust, reaction products and acidic components in the flue gas at the bend of the flue pipe. It solves the problems of difficult ash removal, need for pipe disassembly, easy formation of eddy ash accumulation and high system back pressure of traditional devices. Therefore, an anti-clogging boiler flue gas denitrification device is proposed.

[0005] This utility model provides a denitrification device for anti-clogging boiler flue gas, including a denitrification tower. The inlet end of the denitrification tower is connected to the outlet end of the boiler through an inlet pipe. The outlet end of the denitrification tower is connected to a curved exhaust pipe. A purging pipe is provided on the outside of the curved section of the exhaust pipe. Multiple purging heads distributed circumferentially are installed on the purging pipe. Each purging head extends into the interior of the exhaust pipe and is inclined toward the pipe wall for directional purging of the inner wall of the curved pipe. An ash discharge port is provided at the bottom of the inner side of the curved section of the exhaust pipe. The ash discharge port is sealed by a detachable arc-shaped sealing plate for discharging accumulated dust and reaction products.

[0006] Preferably, the purging head has a "V"-shaped branch structure, with its two air outlets pointing obliquely to the two sides of the inner wall of the curved section of the exhaust pipe. The air inlet of the purging head is connected to an air supply pipe and is connected to a compressed air device to provide air source power for the purging operation.

[0007] Preferably, an annular fixing sleeve is fixedly connected to the outer side of the sealing plate, and ear plates are symmetrically provided at corresponding positions on the outer wall of the exhaust pipe. Through holes are opened on both sides of the fixing sleeve, and after being aligned with the mounting holes on the ear plates, they are fastened together by bolts to achieve detachable fixing of the sealing plate.

[0008] Preferably, the outer side of the vertical section of the exhaust pipe is covered with a heating sleeve one, and the outer side of the curved section is covered with a heating sleeve two. Heating sleeve one and heating sleeve two are respectively connected to a temperature control system to maintain the temperature of different areas of the exhaust pipe and prevent acidic components or reaction products in the flue gas from condensing and precipitating out, which could lead to blockage.

[0009] Preferably, the inner wall of the exhaust pipe is provided with spiral guide vanes extending along the axial direction to guide the flue gas spiral flow, reduce the formation of eddy zones, and promote the settling of dust and droplets towards the ash discharge port.

[0010] Preferably, the exhaust pipe has a flue pipe at its outlet end. The flue pipe has a funnel-shaped structure with a gradually increasing inner diameter, which is used to reduce the flue gas velocity and stabilize the airflow. The exhaust pipe is connected to an extension pipe, which guides the purified flue gas to be discharged smoothly.

[0011] This utility model provides an anti-clogging boiler flue gas denitrification device, which, compared with the prior art, has the following advantages: This invention achieves online purging and periodic ash removal by setting a circumferential purging head and a bottom ash discharge port in the curved section of the exhaust pipe, effectively preventing blockage. The purging head adopts a "V"-shaped structure to expand the ash removal range. The arc-shaped sealing plate is connected to the ear plate by bolts through a fixing sleeve, making disassembly and assembly convenient. Heating sleeve one and heating sleeve two heat the exhaust pipe in sections to prevent acidic substances from condensing and precipitating. The spiral guide vanes on the inner wall guide the flue gas to spiral flow, reduce eddies, and promote dust settling towards the ash discharge port. The outlet is equipped with a trumpet-shaped flue gas expansion pipe and an extension pipe to reduce flow velocity, stabilize airflow, and reduce back pressure. The overall structure integrates anti-blocking, anti-condensation, flow guidance, and stable discharge, improving the operational stability of the denitrification system. At the same time, it can achieve online cleaning without dismantling the entire exhaust pipe. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the bend pipe and other components according to an embodiment of the present utility model; Figure 3 This is a cross-sectional view of the structure such as the bend in the pipe according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the sealing plate and other structures according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of the purge pipe and other components according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the structure of the guide vanes and other components in an embodiment of this utility model.

[0014] Figure label: 1. Denitrification tower; 2. Exhaust pipe; 3. Expansion pipe; 4. Extension pipe; 5. Heating jacket one; 6. Heating jacket two; 7. Purge pipe; 8. Purge head; 9. Gas transmission pipeline; 10. Guide vane; 11. Ash discharge port; 12. Sealing plate; 13. Fixing sleeve; 14. Ear plate; 15. Inlet pipe. Detailed Implementation

[0015] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0016] Please refer to Figures 1-6 This utility model provides an anti-clogging boiler flue gas denitrification device, including a denitrification tower 1. The inlet end of the denitrification tower 1 is connected to the outlet end of the boiler through an inlet pipe 15 to receive high-temperature flue gas and complete the denitrification reaction. The outlet end of the denitrification tower 1 is connected to a bent exhaust pipe 2 to guide the purified flue gas out.

[0017] like Figure 3 As shown, an arc-shaped purge pipe 7 is provided on the outside of the curved section of the exhaust pipe 2. Multiple purge heads 8 are installed on the purge pipe 7 and are evenly distributed around the circumference. Each purge head 8 extends into the interior of the exhaust pipe 2 and is inclined toward the pipe wall to perform directional purge of the inner wall of the curved pipe and remove the attached dust and reaction products.

[0018] like Figure 5 As shown, the purge head 8 has a "V"-shaped branch structure, with its two air outlets pointing obliquely to the two sides of the inner wall of the curved section to expand the purge coverage and improve the dust removal efficiency. The air inlet of the purge head 8 is connected to the air supply pipe 9, which leads to the outside and is connected to the compressed air or steam supply equipment to provide a stable air source for the purge operation. A valve can be installed on the air supply pipe 9 to control the airflow.

[0019] A dust discharge port 11 is provided at the bottom inner side of the curved section of the exhaust pipe 2 for centralized discharge of dust accumulated by blowing or natural settling. The dust discharge port 11 is sealed by a detachable arc-shaped sealing plate 12. An annular fixing sleeve 13 is fixedly connected to the outer side of the sealing plate 12. Ear plates 14 are symmetrically welded to the corresponding positions on the outer wall of the exhaust pipe 2. Through holes are opened on both sides of the fixing sleeve 13. After being aligned with the mounting holes on the ear plates 14, they are fastened by bolts to realize the quick disassembly and assembly of the sealing plate 12, which is convenient for regular cleaning and maintenance.

[0020] To prevent acidic components or ammonium salt reaction products in the flue gas from condensing and precipitating in the low-temperature zone, causing corrosion and blockage of the pipe, a zoned heating structure is set in different areas of the flue pipe 2: the vertical section is covered with heating sleeve 1 5, and the curved section is covered with heating sleeve 2 6. Heating sleeve 1 5 and heating sleeve 2 6 are both electric heating sleeves, with nickel-chromium alloy heating wires embedded inside and an insulation layer on the outside. The two are connected to the temperature control system through wires to achieve independent temperature control and ensure that each section of the flue pipe 2 is maintained above the dew point temperature.

[0021] like Figure 6 As shown, a spiral guide vane 10 is provided along the axial direction on the inner wall of the exhaust pipe 2. The guide vane 10 extends continuously from the starting end of the curved section to the exhaust end, and its spiral angle is 30° to 60°. It is used to guide the flue gas to form a spiral flow, reduce the eddy zone and flow dead zone, promote the settling of dust particles and condensate droplets towards the ash discharge port 11, and enhance the self-cleaning ability. The guide vane 10 is made of stainless steel 304 or has a wear-resistant ceramic coating sprayed on the surface.

[0022] The exhaust pipe 2 is connected to the flue pipe 3 at the exhaust end. The flue pipe 3 has a funnel-shaped structure with a gradually increasing inner diameter. It is used to reduce the flue gas velocity, stabilize the airflow field, and reduce the system back pressure. The exhaust end of the flue pipe 3 is further connected to the extension pipe 4. The extension pipe 4 guides the purified flue gas to the subsequent emission system or chimney to ensure smooth and stable emission.

[0023] In summary, during operation, the flue gas enters the exhaust pipe 2 after being treated by the denitrification tower 1. Heating jacket 5 and heating jacket 6 maintain the pipe temperature and prevent condensation. The spiral guide vane 10 guides the flue gas spiral forward to reduce deposition. When anti-clogging is required, compressed air enters the purge head 8 through the gas delivery pipe 9 to purge the inner wall of the bend, loosening the accumulated ash. Under the action of gravity and airflow, the dust slides down along the guide vane to the vicinity of the ash discharge port 11. The ash discharge operation can be completed by periodically disassembling the arc-shaped sealing plate 12. The expansion pipe 3 and extension pipe 4 ensure the final stable emission.

[0024] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A boiler flue gas denitrification device for preventing clogging, characterized in that: Comprising a denitrification tower (1), wherein the smoke inlet end of the denitrification tower (1) is connected to the smoke outlet end of a boiler through a smoke inlet pipe (15), the smoke outlet end of the denitrification tower (1) is connected with a bent tubular smoke exhaust pipe (2), a purge pipe (7) is arranged outside the bent section of the smoke exhaust pipe (2), a plurality of purge heads (8) distributed along the circumferential direction are installed on the purge pipe (7), each purge head (8) extends into the interior of the smoke exhaust pipe (2) and is arranged obliquely toward the pipe wall, so as to perform directional purging on the inner wall of the bent pipe, an ash discharge port (11) is provided at the inner bottom of the bent section of the smoke exhaust pipe (2), and the ash discharge port (11) is sealed and closed by a detachable arc-shaped sealing plate (12) for discharging accumulated dust and reaction products.

2. The anti-clogging boiler flue gas denitrification device according to claim 1, characterized in that: The purge head (8) is in a herringbone branched structure, two air outlet ends thereof respectively obliquely point to two side regions of the inner wall of the bent section of the smoke exhaust pipe (2), the air inlet end of the purge head (8) is connected with a gas transmission pipeline (9) and connected to compressed air equipment, so as to provide gas source power for purging operation.

3. The anti-clogging boiler flue gas denitrification device according to claim 2, characterized in that: An annular fixing sleeve (13) is fixedly connected to the outer side of the sealing plate (12), ear plates (14) are symmetrically arranged at corresponding positions on the outer wall of the smoke exhaust pipe (2), through holes are opened on both sides of the fixing sleeve (13), and after being aligned with mounting holes on the ear plates (14), the fixing sleeve is fastened and connected through bolts, so as to realize detachable fixing of the sealing plate (12).

4. The anti-clogging boiler flue gas denitrification device according to claim 3, characterized in that: A first heating jacket (5) is wrapped outside the vertical section of the smoke exhaust pipe (2), and a second heating jacket (6) is wrapped outside the bent section of the smoke exhaust pipe (2). The first heating jacket (5) and the second heating jacket (6) are respectively connected to a temperature control system, for maintaining the temperature of different regions of the smoke exhaust pipe (2) and preventing blockage caused by condensation and precipitation of acidic components or reaction products in flue gas.

5. The anti-clogging boiler flue gas denitrification device according to claim 4, characterized in that: The inner wall of the smoke exhaust pipe (2) is provided with a spiral flow guiding vane (10) extending along the axial direction, for guiding flue gas to flow spirally, reducing the formation of vortex regions and promoting the sedimentation of dust and droplets toward the ash discharge port (11).

6. The anti-clogging boiler flue gas denitrification device according to claim 5, characterized in that: The smoke outlet end of the smoke exhaust pipe (2) is connected with a smoke expanding pipe (3), the smoke expanding pipe (3) is in a horn-shaped structure with a gradually increasing inner diameter, for reducing the flow velocity of flue gas and stabilizing air flow, the smoke outlet end of the smoke expanding pipe (3) is connected with an extension pipe (4), and the extension pipe (4) guides purified flue gas to be discharged stably.

Images