Device for tracking optimal reaction temperature interval of selective non-catalytic reduction (SNCR) system and automatically adjusting movable spray gun

Abstract

The invention discloses an SNCR (selective non-catalytic reduction) system optimal reaction temperature interval tracking and movable spray gun automatic adjusting device, and relates to the field of waste incineration waste gas treatment, the SNCR system optimal reaction temperature interval tracking and movable spray gun automatic adjusting device comprises a hearth, a spray gun, an infrared temperature measuring device and a fire observation port, and the infrared temperature measuring equipment is used for monitoring the temperature change condition of the flame area in real time and determining the optimal reaction temperature area. The deflection angle of the spray gun can be adjusted through cooperation of a guide rail in the angle adjusting mechanism and the supporting frame, and the rotation angle of the spray gun can be adjusted through cooperation of a disc type adjusting disc in the angle adjusting mechanism and the supporting frame, so that the spray gun can be aligned to the optimal reaction temperature area, and the treatment efficiency is remarkably improved; the threaded rod and the spray gun can slide along the sleeve through the depth adjusting mechanism, so that the depth of the spray gun inserted into the hearth is adjusted, and the pollutant contact efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of waste incineration exhaust gas treatment, specifically to an SNCR system optimal reaction temperature range tracking and movable spray gun automatic adjustment device. Background Technology

[0002] With the acceleration of urbanization and the improvement of residents' living standards, the calorific value of municipal solid waste is showing a continuous upward trend. Simultaneously, to achieve sludge reduction and resource recovery, an increasing number of municipal solid waste incineration power plants are beginning to co-process urban drainage sludge. These changes have resulted in the average calorific value of the waste fed into the incinerator significantly exceeding the original design range of some existing waste heat incineration boilers, posing a severe challenge to the stable and efficient operation of the incinerators.

[0003] In actual operation, the increase in the calorific value of the waste fed into the furnace directly causes a general rise in furnace temperature, leading to frequent fluctuations in boiler load. Simultaneously, the problem of uneven temperature distribution and excessive temperature differences between the left and right sides of the furnace is becoming increasingly prominent. These changes in operating conditions have a serious adverse impact on the performance of the in-furnace selective non-catalytic reduction (SNCR) denitrification system: on the one hand, temperature deviations from the optimal SNCR reaction window (typically 850℃-1050℃) result in a significant decrease in denitrification efficiency; on the other hand, uneven temperature distribution prevents some spray nozzles from being in the ideal reaction zone, further reducing the utilization efficiency of the reducing agent.

[0004] Currently, to control the emission concentration of nitrogen oxides (NOx) in flue gas, many waste incineration plants adopt a combined process of "SNCR + dry / semi-dry acid removal + activated carbon injection + bag filter + SCR". Among them, although the SCR system located at the end of the flue gas treatment can effectively remove NOx (with an efficiency of over 67%) and together with the SNCR system achieve the goal of a total denitrification efficiency of over 70%, the operation of the SCR system cannot solve the problem of low efficiency caused by temperature deviation in the front-end SNCR system.

[0005] Of particular importance is that existing automatic control strategies for SNCR systems typically rely on feedback adjustments based on NOx concentration values ​​detected by the CEMS at the chimney outlet. However, since the SCR system is located after the SNCR system, its highly efficient denitrification significantly reduces the NOx concentration in the tail gas, making the feedback signal based on the final emission value unable to accurately reflect the actual operating status of the SNCR system, resulting in control lag or even ineffectiveness. This deficiency in the control method makes it difficult for the SNCR system to consistently operate at its optimal state.

[0006] Therefore, the key to solving the above problems lies in ensuring that the SNCR system can operate autonomously and accurately within its optimal reaction temperature range. Real-time tracking of the furnace temperature distribution and dynamic adjustment of the reducing agent injection position (including injection angle and depth) has become an urgent technical requirement for improving SNCR denitrification efficiency, reducing ammonia and demineralized water consumption, mitigating wear on furnace castables, and ultimately achieving economical and environmentally friendly operation of waste incineration power plants. Summary of the Invention

[0007] The purpose of this invention is to provide an optimal reaction temperature range tracking and movable spray gun automatic adjustment device for an SNCR system, so as to solve the technical problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an optimal reaction temperature range tracking and movable spray gun automatic adjustment device for an SNCR system, comprising a furnace, a spray gun, an infrared temperature measuring device and a viewing port, wherein a movable infrared temperature measuring device is installed at the front end of the furnace, and the infrared temperature measuring device is used to monitor the temperature change of the flame area in real time and determine the optimal reaction temperature range, and viewing ports are provided at the rear ends of both sides of the furnace. Angle adjustment mechanisms are provided on both sides of the furnace at the front of the observation port. These mechanisms enable the spray gun to be aimed at the optimal reaction temperature zone, thereby significantly improving processing efficiency. Each angle adjustment mechanism includes a disc-shaped adjustment plate symmetrically welded to both sides of the furnace and a mounting frame movably connected to the side of the disc-shaped adjustment plate. The disc-shaped adjustment plate is used to adjust the rotation angle of the spray gun. A guide rail is slidably connected to the inside of the mounting frame on the side away from the disc-shaped adjustment plate, and the mounting frame and the guide rail cooperate to adjust the deflection angle of the spray gun.

[0009] Preferably, the disc-shaped adjusting plate consists of five positioning rings, and rigid pipes are movably connected to the interior of both sides of the furnace.

[0010] Preferably, a ball 1, which is rotatably connected to the furnace, is fixedly connected to the middle of the surface of the rigid tube, and a ball 2, which is rotatably connected to the guide rail, is slidably connected to one side of the surface of the rigid tube.

[0011] Preferably, the disc-shaped adjustment plate, the mounting frame, and the guide rail are all provided with threaded holes, and bolts are threaded into the threaded holes. The threaded holes and bolts are used to fix the plate after adjustment.

[0012] Preferably, a limiting groove is provided on the inner side of the disc-shaped adjustment plate. The limiting groove is configured as an annular structure. A limiting member is symmetrically welded on the side of the mounting frame away from the guide rail, which forms a sliding structure with the limiting groove. The limiting member is configured as an L-shaped structure, and the limiting member cooperates with the limiting groove to enable the mounting frame to rotate stably.

[0013] Preferably, a spray gun is provided on the side of the rigid tube away from the sphere, a metal flexible tube is provided on the side of the rigid tube away from the spray gun, and a delivery tube is provided on the side of the metal flexible tube away from the rigid tube.

[0014] Preferably, a depth adjustment mechanism is provided through the inner side of the spray gun and the rigid tube, and the depth adjustment mechanism is used to adjust the insertion depth of the spray gun into the furnace. The depth adjustment mechanism includes a support frame welded to the inner side of the rigid tube and a bevel gear set rotatably connected to the support frame.

[0015] Preferably, the bottom end of the bevel gear set is fixedly connected to a handle that is connected to the rigid tube via a bearing, a threaded cylinder is fixedly connected to one side of the bevel gear set, and a threaded rod that is threadedly connected to the threaded cylinder is fixedly connected to the inner side of the spray gun, and the threaded cylinder and the threaded rod cooperate to make the spray gun slide along the sleeve.

[0016] Preferably, the outer surface of the spray gun is welded with symmetrically distributed limiting blocks, and a sleeve is fixedly connected to one side of the rigid tube.

[0017] Preferably, the inner surface of the sleeve is provided with symmetrically distributed sliding grooves, the limiting block and the sliding grooves form a sliding structure, and the limiting block and the sliding grooves cooperate to allow the spray gun to slide along the sleeve.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. The SNCR system's optimal reaction temperature range tracking and movable spray gun automatic adjustment device, through the cooperation of the guide rail and support frame in the angle adjustment mechanism, allows the second ball to drive the rigid tube to deflect around the first ball as the axis, thereby adjusting the spray gun deflection angle. Through the cooperation of the disc-type adjustment plate in the angle adjustment mechanism and the support frame, the rigid tube can be rotated around the second ball as the axis, thereby adjusting the spray gun rotation angle, thus enabling the spray gun to be aligned with the optimal reaction temperature range, significantly improving processing efficiency.

[0019] 2. The optimal reaction temperature range tracking and movable spray gun automatic adjustment device of this SNCR system, through the cooperation of the threaded cylinder, threaded rod, and sleeve in the depth adjustment mechanism, allows the threaded rod and spray gun to slide along the sleeve, thereby adjusting the depth of the spray gun insertion into the furnace. By adjusting the depth of the spray gun insertion into the furnace, the mixing conditions of the reducing agent and flue gas can be precisely controlled, significantly improving the uniformity of atomization coverage in the optimal reaction temperature range, thereby improving the pollutant contact efficiency and achieving optimized denitrification effect. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional structural diagram of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a three-dimensional structural schematic diagram of the angle adjustment mechanism of the present invention; Figure 5 This is a three-dimensional exploded view of the disc-shaped adjustment plate and the support frame of the present invention. Figure 6 This is a three-dimensional exploded view of the depth adjustment mechanism of the present invention; Figure 7 This is a three-dimensional exploded view of the bevel gear set and the handle of the present invention; Figure 8 This is a three-dimensional structural diagram of the invention in its initial state; Figure 9 This is a three-dimensional structural diagram of the furnace chamber of the present invention.

[0021] In the diagram: 1. Furnace chamber; 2. Spray gun; 3. Infrared temperature measuring device; 4. Observation port; 5. Depth adjustment mechanism; 501. Support frame; 502. Handle; 503. Bevel gear set; 504. Threaded cylinder; 505. Threaded rod; 506. Sleeve; 507. Slide groove; 508. Limiting block; 6. Rigid pipe; 601. Sphere one; 602. Sphere two; 7. Metal flexible hose; 8. Conveying pipe; 9. Angle adjustment mechanism; 901. Disc-type adjustment plate; 902. Mounting frame; 903. Guide rail; 904. Threaded hole; 905. Bolt; 10. Limiting component; 11. Limiting groove. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1 and Figure 9 This invention provides a technical solution: an optimal reaction temperature range tracking and movable spray gun automatic adjustment device for an SNCR system, comprising a furnace 1, a spray gun 2, an infrared thermometer 3, and observation ports 4. A movable infrared thermometer 3 is installed at the front end of the furnace 1, which is used to monitor the temperature changes in the flame area in real time and determine the optimal reaction temperature range. Observation ports 4 are provided at the rear ends of both sides of the furnace 1.

[0024] Specifically, the infrared temperature measurement device 3 monitors the temperature changes in the flame area in real time and determines the optimal reaction temperature zone.

[0025] exist Figure 1 , Figure 2 , Figures 4-6 and Figure 8 In the furnace chamber 1, angle adjustment mechanisms 9 are installed on both sides at the front of the observation ports 4. These mechanisms allow the spray gun 2 to be aligned with the optimal reaction temperature zone, significantly improving processing efficiency. Each angle adjustment mechanism 9 includes a disc-shaped adjustment plate 901 symmetrically welded to both sides of the furnace chamber 1 and a mounting frame 902 movably connected to the side of the disc-shaped adjustment plate 901. The disc-shaped adjustment plate 901 adjusts the rotation angle of the spray gun 2. The disc-shaped adjustment plate 901 consists of five positioning rings. A guide rail 903 is slidably connected to the inside of the mounting frame 902 on the side furthest from the disc-shaped adjustment plate 901. The mounting frame 902 and the guide rail 903 cooperate to adjust the deflection angle of the spray gun 2. Rigid tubes 6 are movably connected to the inside of both sides of the furnace chamber 1. A ball 601, rotatably connected to the furnace chamber 1, is fixedly connected to the center of the surface of the rigid tube 6. A second ball 602, rotatably connected to the guide rail 903, is slidably connected to one side of the surface of the rigid tube 6.

[0026] Specifically, since the guide rail 903 is slidably connected to the mounting frame 902, and the rigid pipe 6 is rotatably connected to the furnace 1 and the guide rail 903 through sphere 1 601 and sphere 2 602 respectively, and the rigid pipe 6 is also slidably connected to sphere 2 602, when the bolt 905 is separated from the threaded hole 904 on the mounting frame 902, the deflection angle of the spray gun 2 can be adjusted by moving the guide rail 903. Since the mounting frame 902 is rotatably connected to the disc-type adjustment plate 901 through the limiting member 10 and the limiting groove 11, when the bolt 905 is separated from the threaded hole 904 on one side of the disc-type adjustment plate 901, the rotation angle of the spray gun 2 can be adjusted by rotating the mounting frame 902, so that the spray gun 2 can be aligned with the optimal reaction temperature area.

[0027] exist Figure 2 , Figure 4 , Figure 5 and Figure 8 In the middle: the disc-type adjustment plate 901, the mounting frame 902 and the guide rail 903 are all provided with threaded holes 904. The threaded holes 904 are connected to bolts 905. The threaded holes 904 and bolts 905 are used to fix the adjustment.

[0028] Specifically, the adjustment and fixation can be achieved by using the threaded hole 904 and the bolt 905 to improve stability.

[0029] exist Figure 2In the middle: a limiting groove 11 is provided on the inner side of the disc-type adjustment plate 901. The limiting groove 11 is set as an annular structure. On the side of the mounting frame 902 away from the guide rail 903, a limiting member 10 is symmetrically welded to form a sliding structure with the limiting groove 11. The limiting member 10 is set as an L-shaped structure. The limiting member 10 cooperates with the limiting groove 11 to enable the mounting frame 902 to rotate stably.

[0030] Specifically, the cooperation between the limiting member 10 and the limiting groove 11 can achieve the support and limiting of the mounting frame 902, so that the mounting frame 902 can rotate stably.

[0031] exist Figure 1 , Figure 2 , Figures 4-6 and Figure 8 In the middle section: a spray gun 2 is provided on the side of the rigid pipe 6 away from the sphere 601, a metal hose 7 is provided on the side of the rigid pipe 6 away from the spray gun 2, and a delivery pipe 8 is provided on the side of the metal hose 7 away from the rigid pipe 6.

[0032] Specifically, the spray gun 2 is set up with three groups, each group consisting of two guns, with each group spaced 1.05 meters apart.

[0033] Specifically, the metal flexible hose 7 allows for unobstructed adjustment of the rigid pipe 6, and a delivery pipe 8 is provided on the side of the metal flexible hose 7 away from the rigid pipe 6.

[0034] exist Figures 1-4 and Figure 6 , Figure 7 , Figure 8 In the middle section: A depth adjustment mechanism 5 is provided through the inner side of the spray gun 2 and the rigid tube 6. The depth adjustment mechanism 5 is used to adjust the depth of the spray gun 2 inserted into the furnace chamber 1. The depth adjustment mechanism 5 includes a support frame 501 welded to the inner side of the rigid tube 6 and a bevel gear set 503 rotatably connected to the support frame 501. The bottom end of the bevel gear set 503 is fixedly connected to a handle 502 connected to the rigid tube 6 through a bearing. A threaded cylinder 504 is fixedly connected to one side of the bevel gear set 503. A threaded rod 505 threadedly connected to the threaded cylinder 504 is fixedly connected to the inner side of the spray gun 2. The threaded cylinder 504 and the threaded rod 505 cooperate to make the spray gun 2 slide along the sleeve 506.

[0035] Specifically, by rotating the handle 502, the threaded cylinder 504 rotates synchronously under the action of the bevel gear set 503. Since the threaded rod 505 is threadedly connected to the threaded cylinder 504, and the spray gun 2 is slidably connected to the sleeve 506 through the limiting block 508 and the sliding groove 507, the threaded rod 505 and the spray gun 2 can slide along the sleeve 506, thereby realizing the adjustment of the insertion depth of the spray gun 2 into the furnace 1. By adjusting the insertion depth of the spray gun 2 into the furnace 1, the mixing conditions of the reducing agent and the flue gas can be precisely controlled, significantly improving the uniformity of atomization coverage in the optimal reaction temperature zone, thereby improving the contact efficiency of pollutants and achieving the optimization and improvement of the denitrification effect.

[0036] exist Figure 3 and Figure 6 In the middle: The outer surface of the spray gun 2 is welded with symmetrically distributed limiting blocks 508. A sleeve 506 is fixedly connected to one side of the rigid tube 6. The inner surface of the sleeve 506 is provided with symmetrically distributed sliding grooves 507. The limiting blocks 508 and the sliding grooves 507 form a sliding structure. The limiting blocks 508 and the sliding grooves 507 cooperate to enable the spray gun 2 to slide along the sleeve 506.

[0037] Specifically, the limiting block 508 and the slide groove 507 work together to support and limit the spray gun 2, allowing the spray gun 2 to slide along the sleeve 506.

[0038] The infrared temperature measuring device 3 monitors the temperature changes in the flame areas of the left and right furnace chambers 1 in real time and determines the optimal reaction temperature range. At the same time, the temperature and thermal control calculation unit calculates the starting and ending temperature ranges of the optimal reaction temperature of the working medium based on the temperature range changes of the furnace chamber 1 detected by the infrared temperature measuring device 3 and the cross-sectional parameters of the boiler furnace chamber 1. The flow adjustment and thermal control control unit controls the mixing ratio of ammonia and steam according to the furnace temperature reaction range and controls the steam pressure, thereby controlling the ammonia to reach any area in the furnace chamber 1, allowing the optimal temperature range to carry out the main denitrification reaction, while other areas carry out auxiliary denitrification reactions.

[0039] In this process, after separating the bolt 905 from the threaded hole 904 on the mounting frame 902, the ball 602 can be moved by the guide rail 903 to drive the rigid tube 6 to deflect around the ball 601, thereby adjusting the deflection angle of the spray gun 2. After separating the bolt 905 from the threaded hole 904 on one side of the disc-type adjustment plate 901, the rigid tube 6 can be rotated around the ball 602 by rotating the mounting frame 902, thereby adjusting the rotation angle of the spray gun 2, so that the spray gun 2 can be aligned with the optimal reaction temperature area. By rotating the handle 502, the threaded cylinder 504 rotates synchronously under the action of the bevel gear set 503. Through the thread action of the threaded rod 505 and the threaded cylinder 504 and the sliding action of the spray gun 2 and the sleeve 506, the threaded rod 505 and the spray gun 2 can slide along the sleeve 506, thereby adjusting the depth of the spray gun 2 inserted into the furnace 1.

[0040] Electrical equipment (including but not limited to motors, electric actuators, etc.) is safely powered by an external power source and controlled by a control box. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for tracking the optimal reaction temperature range of an SNCR system and for automatically adjusting a movable spray gun, comprising a furnace (1), a spray gun (2), an infrared thermometer (3), and observation ports (4), wherein a movable infrared thermometer (3) is installed at the front end of the furnace (1), and the infrared thermometer (3) is used to monitor the temperature change of the flame area in real time and determine the optimal reaction temperature range; observation ports (4) are provided at the rear ends of both sides of the furnace (1); characterized in that: Angle adjustment mechanisms (9) are provided on both sides of the furnace (1) at the front end of the observation port (4). The angle adjustment mechanism (9) is used to enable the spray gun (2) to be aligned with the optimal reaction temperature area, so as to significantly improve the processing efficiency. The angle adjustment mechanism (9) includes a disc-type adjustment plate (901) symmetrically welded on both sides of the furnace (1) and a mounting frame (902) movably connected to the side of the disc-type adjustment plate (901). The disc-type adjustment plate (901) is used to adjust the rotation angle of the spray gun (2). The mounting frame (902) is slidably connected to a guide rail (903) on the side away from the disc-type adjustment plate (901). The mounting frame (902) and the guide rail (903) cooperate to adjust the deflection angle of the spray gun (2).

2. The SNCR system optimal reaction temperature range tracking and movable spray gun automatic adjustment device according to claim 1, characterized in that: The disc-shaped adjustment plate (901) consists of five positioning rings, and rigid pipes (6) are movably connected to the interior of both sides of the furnace (1).

3. The SNCR system optimal reaction temperature range tracking and movable spray gun automatic adjustment device according to claim 2, characterized in that: A ball (601) is fixedly connected to the middle of the surface of the rigid tube (6) and rotatably connected to the furnace (1), and a ball (602) is slidably connected to one side of the surface of the rigid tube (6) and rotatably connected to the guide rail (903).

4. The SNCR system optimal reaction temperature range tracking and movable spray gun automatic adjustment device according to claim 1, characterized in that: The disc-shaped adjustment plate (901), the mounting frame (902) and the guide rail (903) are all provided with threaded holes (904). The threaded holes (904) are threaded with bolts (905), and the threaded holes (904) and bolts (905) are used to fix the adjustment.

5. The SNCR system optimal reaction temperature range tracking and movable spray gun automatic adjustment device according to claim 4, characterized in that: The inner side of the disc-type adjustment plate (901) has a limiting groove (11), which is a ring structure. The mounting frame (902) away from the guide rail (903) is symmetrically welded with a limiting member (10) that forms a sliding structure with the limiting groove (11). The limiting member (10) is an L-shaped structure, and the limiting member (10) cooperates with the limiting groove (11) to enable the mounting frame (902) to rotate stably.

6. The SNCR system optimal reaction temperature range tracking and movable spray gun automatic adjustment device according to claim 2, characterized in that: A spray gun (2) is provided on the side of the rigid tube (6) away from the sphere (601), a metal hose (7) is provided on the side of the rigid tube (6) away from the spray gun (2), and a delivery pipe (8) is provided on the side of the metal hose (7) away from the rigid tube (6).

7. The SNCR system optimal reaction temperature range tracking and movable spray gun automatic adjustment device according to claim 6, characterized in that: A depth adjustment mechanism (5) is provided through the inner side of the spray gun (2) and the hard tube (6), and the depth adjustment mechanism (5) is used to adjust the depth of the spray gun (2) inserted into the furnace (1). The depth adjustment mechanism (5) includes a support frame (501) welded to the inner side of the hard tube (6) and a bevel gear set (503) rotatably connected to the support frame (501).

8. The SNCR system optimal reaction temperature range tracking and movable spray gun automatic adjustment device according to claim 7, characterized in that: The bottom end of the bevel gear set (503) is fixedly connected to a handle (502) that is connected to the rigid tube (6) via a bearing. A threaded cylinder (504) is fixedly connected to one side of the bevel gear set (503). A threaded rod (505) that is threadedly connected to the threaded cylinder (504) is fixedly connected to the inner side of the spray gun (2). The threaded cylinder (504) and the threaded rod (505) cooperate to make the spray gun (2) slide along the sleeve (506).

9. The SNCR system optimal reaction temperature range tracking and movable spray gun automatic adjustment device according to claim 8, characterized in that: The outer surface of the spray gun (2) is welded with symmetrically distributed limiting blocks (508), and a sleeve (506) is fixedly connected to one side of the rigid tube (6).

10. The SNCR system optimal reaction temperature range tracking and movable spray gun automatic adjustment device according to claim 9, characterized in that: The inner surface of the sleeve (506) is provided with symmetrically distributed sliding grooves (507). The limiting block (508) and the sliding groove (507) form a sliding structure, and the limiting block (508) and the sliding groove (507) cooperate to enable the spray gun (2) to slide along the sleeve (506).

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