Externally-mounted intelligent ammonia spraying closed-loop control equipment for SCR (selective catalytic reduction) denitration

Abstract

The utility model discloses SCR denitration externally-hung intelligent ammonia spraying closed-loop control equipment which comprises a liquid storage tank, a closing cover is movably connected to the position, close to the front face, of the top of the liquid storage tank in a sleeved mode, and a first connecting pipe is fixedly connected to the position, close to the back of the closing cover, of the top of the liquid storage tank in a sleeved mode. An electrical controller is fixedly connected to the position, close to the back of the first connecting pipe, of the top of the liquid storage tank, a main controller is fixedly connected to the back of the electrical controller, a control displayer is fixedly connected to the back of the main controller, and a connecting block is fixedly connected to the position, close to one side, of the main controller; the front face of the side, away from the main controller, of the connecting block is fixedly connected with a limiting block. According to the utility model, the infrared sensor and the control valve are arranged, so that the optimal performance of the denitration process can be ensured, and excessive use of ammonia water can be avoided by finely controlling the spraying amount of the ammonia water, so that the energy consumption and the ammonia emission are reduced, and the pollution to the environment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of denitration, in particular to an SCR denitration externally mounted intelligent ammonia spraying closed-loop control device. Background Art

[0002] SCR denitrification is a commonly used nitrogen oxide emission reduction technology used in high-temperature flue gas purification in industrial fields and the power industry. SCR is a commonly used denitrification technology that injects ammonia or urea solution into the flue gas during the combustion process, and then converts nitrogen oxides into nitrogen and water vapor through a catalytic reaction, thereby reducing the emission of harmful nitrogen oxides in the exhaust gas.

[0003] At present, when the existing SCR denitrification external intelligent ammonia spray closed-loop control equipment is in use, it mostly detects the nitrogen oxide content in the flue gas through a single sensor before spraying ammonia water into the flue, and then controls the amount of ammonia water sprayed to react with the nitrogen oxides in the flue gas. However, the overall consumption of this treatment method is still relatively high, and the overall operating consumption cost is also relatively high. Utility Model Content

[0004] The purpose of the utility model is to solve the problems of insufficient refinement and relatively high consumption in the existing technology, and to propose an SCR denitrification external intelligent ammonia injection closed-loop control device.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The SCR denitrification external intelligent ammonia injection closed-loop control device includes a liquid storage tank, a closing cover is movably sleeved on the top of the liquid storage tank near the front, a first connecting pipe is fixedly sleeved on the top of the liquid storage tank near the back of the closing cover, an electrical controller is fixedly connected to the top of the liquid storage tank near the back of the first connecting pipe, a main controller is fixedly connected to the back of the electrical controller, a control display is fixedly connected to the back of the main controller, a connecting block is fixedly connected to one side of the main controller, a limiting block is fixedly connected to the front of the connecting block away from the main controller, a fixed pipe is fixedly connected to the side of the limiting block away from the main controller, the end of the first connecting pipe away from the liquid storage tank is connected to a delivery pump, and the end of the delivery pump away from the first connecting pipe is connected to a second connecting pipe.

[0007] Preferably, the second connecting pipe is connected to a limiting block at a position close to one side, and the limiting block is fixedly connected to an infrared sensor on a side away from the main controller. The infrared sensor is connected to the main controller through a connecting block, and the limiting block is fixedly connected to a first connecting ring, a second connecting ring and a third connecting ring on a side away from the main controller.

[0008] Preferably, the side of the second connecting pipe away from the main controller is connected to a shunt pipe, the shunt pipe is located on the inner side of the limiting block, the outer surface of the shunt pipe is fixedly sleeved with a control valve on the side away from the second connecting pipe, and the control valve is provided with a fixed block on the side away from the second connecting pipe, the fixed block is fixedly sleeved with the shunt pipe, the fixed block is located on the inner side of the fixed pipe, and the fixed block is fixedly sleeved with the shunt pipe.

[0009] Preferably, the bottom of the main controller is fixedly connected to the liquid storage tank, the bottom of the control display is fixedly connected to the liquid storage tank, and the front and back of the fixed tube are fixedly sleeved with connecting flanges.

[0010] Preferably, atomizing nozzles are fixedly connected to the inner sides of the first connecting ring, the second connecting ring and the third connecting ring, and the first connecting ring, the second connecting ring and the third connecting ring are equidistantly distributed in a row, and the atomizing nozzles are all inclined, and the atomizing nozzles are all facing the inner side of the fixed tube corresponding to the position close to the back, and the atomizing nozzles are distributed in a circular arrangement on the first connecting ring, the second connecting ring and the third connecting ring.

[0011] Preferably, the atomizing nozzle is connected to the diverter pipe, and the liquid inflow of the atomizing nozzles on the first connecting ring, the second connecting ring and the third connecting ring are all controlled by corresponding control valves on the diverter pipe.

[0012] Preferably, the first connecting ring, the second connecting ring and the third connecting ring are all provided with infrared sensors near the back, and the first connecting ring is provided with an infrared sensor near the front. The infrared sensors are all located at the back of the overall direction of the atomizing nozzle.

[0013] Compared with the existing technology, the utility model provides an SCR denitrification external intelligent ammonia injection closed-loop control device with the following beneficial effects:

[0014] 1. The SCR denitrification external intelligent ammonia injection closed-loop control equipment is equipped with an infrared sensor and a control valve. Through the multi-level setting of the infrared sensor, the nitrogen oxide content in the flue gas is detected multiple times, and the liquid supply of the atomizing nozzles on the corresponding first connecting ring, second connecting ring and third connecting ring is controlled by the control valve accordingly. This is conducive to more accurate understanding of the working status of the SCR system and adjusting the denitrification efficiency according to the real-time flue gas composition and reaction conditions, which is conducive to ensuring the optimal performance of the denitrification process. This fine control of the ammonia injection amount can avoid excessive use of ammonia, thereby reducing energy consumption and ammonia emissions, lowering overall operating costs, and reducing pollution to the environment.

[0015] 2. The SCR denitrification external intelligent ammonia injection closed-loop control equipment is equipped with a first connecting ring, a second connecting ring and a third connecting ring. Through the arrangement of these three, the nitrogen oxides in the flue gas can be fully reacted under the control and adjustment of the infrared sensor and the control valve, which is beneficial to improve the denitrification efficiency of the equipment, reduce cost consumption, reduce the wear and corrosion of the equipment body by nitrogen oxides, reduce the maintenance frequency and maintenance cost of the equipment, and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the SCR denitrification external intelligent ammonia injection closed-loop control equipment proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the back structure of the SCR denitrification external intelligent ammonia injection closed-loop control equipment proposed in the utility model.

[0018] Figure 3 This is a schematic diagram of the limiting block of the SCR denitrification external intelligent ammonia injection closed-loop control equipment proposed in the utility model.

[0019] Figure 4 This is a schematic diagram of the shunt pipe of the SCR denitrification external intelligent ammonia injection closed-loop control equipment proposed in the utility model.

[0020] In the figure: 1. Liquid storage tank; 2. Closing cover; 3. Controller; 4. Electrical controller; 5. First connecting pipe; 6. Delivery pump; 7. Second connecting pipe; 8. Fixed pipe; 9. Connecting flange; 10. Connecting block; 11. Limiting block; 12. Control display; 13. First connecting ring; 14. Infrared sensor; 15. Atomizing nozzle; 16. Second connecting ring; 17. Third connecting ring; 18. Diverter pipe; 19. Control valve; 20. Fixed block. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] Reference Figure 1-4, SCR denitrification external intelligent ammonia injection closed-loop control equipment, including a liquid storage tank 1, a closing cover 2 is movably sleeved on the top of the liquid storage tank 1 near the front, a first connecting pipe 5 is fixedly sleeved on the top of the liquid storage tank 1 near the back of the closing cover 2, an electrical controller 4 is fixedly connected to the top of the liquid storage tank 1 near the back of the first connecting pipe 5, a main controller 3 is fixedly connected to the back of the electrical controller 4, the bottom of the main controller 3 is fixedly connected to the liquid storage tank 1, the bottom of the control display 12 is fixedly connected to the liquid storage tank 1, a connecting flange 9 is fixedly sleeved on the front and back of the fixed pipe 8, the control display 12 is fixedly connected to the back of the main controller 3, a connecting block 10 is fixedly connected to one side of the main controller 3, a limiting block 11 is fixedly connected to the front of the connecting block 10 away from the main controller 3, and a fixed pipe 8 is fixedly connected to the side of the limiting block 11 away from the main controller 3, the end of the first connecting pipe 5 away from the liquid storage tank 1 is connected to the delivery pump 6, and the end of the delivery pump 6 away from the first connecting pipe 5 is connected to the second connecting pipe 7.

[0024] Reference Figure 1-4The second connecting pipe 7 is connected to a limiting block 11 near one side. The limiting block 11 is provided to improve the protection of the shunt pipe 18 and improve the stability of the equipment. The limiting block 11 is fixedly connected to the side away from the main controller 3 with an infrared sensor 14. The infrared sensor 14 is provided to facilitate more refined detection of flue gas, which is beneficial to improving the effect of ensuring the flue gas treatment reaction, improving the accuracy of the equipment, and ensuring the full utilization of ammonia. The infrared sensor 14 is connected to the main controller 3 through the connecting block 10. The limiting block 11 is connected to the side away from the main controller 3, and is fixedly connected with the first communicating ring 13, the second communicating ring 16 and the third communicating ring 17. The first communicating ring 13, the second communicating ring 16 and the third communicating ring 17 realize multi-stage atomization spraying through the atomizing nozzle 15, which is beneficial to ensure the effect of the reaction and cleaning of nitrogen oxides in the flue gas. The first communicating ring 13, the second communicating ring 16 and the third communicating ring 17 are all provided with infrared sensors 14 near the back. The first communicating ring 13 is provided with an infrared sensor 14 near the front. 13. The inner sides of the second communicating ring 16 and the third communicating ring 17 are fixedly connected with an atomizing nozzle 15, which is connected to the shunt pipe 18. The liquid inlet of the atomizing nozzle 15 on the first communicating ring 13, the second communicating ring 16 and the third communicating ring 17 is controlled by the corresponding control valve 19 on the shunt pipe 18. The atomizing nozzle 15 is tilted, and the atomizing nozzle 15 is facing the inner side of the fixed tube 8 corresponding to the position close to the back. The atomizing nozzle 15 presents a ring-shaped arrangement of the lamps on the first communicating ring 13, the second communicating ring 16 and the third communicating ring 17. Distribution, the side of the second connecting pipe 7 away from the main controller 3 is connected to the shunt pipe 18, the shunt pipe 18 is located on the inner side of the limiting block 11, and the outer surface of the shunt pipe 18 is fixedly connected with a control valve 19 on the side away from the second connecting pipe 7. The control valve 19 is provided to improve the accuracy of control and ensure the full utilization of ammonia water. A fixed block 20 is provided on the side of the control valve 19 away from the second connecting pipe 7. The fixed block 20 is fixedly connected with the shunt pipe 18. The fixed block 20 is located on the inner side of the fixed pipe 8, and the fixed block 20 is fixedly connected with the shunt pipe 18.

[0025] In the present invention, when in use, the fixed pipe 8 can be connected to the flue gas conveying pipe through the connecting flange 9, the closing cover 2 can be removed, and sufficient ammonia water can be provided to the liquid storage tank 1. When the flue gas passes through, the infrared sensor 14 on the front of the first connecting ring 13 is used for the first detection, and the data is processed and analyzed by the main controller 3. According to the preset denitrification effect requirements, the liquid inlet to the first connecting ring 13 is controlled by the control valve 19, and then atomized and sprayed through the atomizing nozzle 15 on the first connecting ring 13, so that the ammonia water reacts with the nitrogen oxides in the flue gas to generate harmless nitrogen and water vapor. At the same time, the infrared sensor on the front of the second connecting ring 16 on the back of the first connecting ring 13 The infrared sensor 14 performs a secondary detection, controls the control valve 19 through the main controller 3, adjusts the liquid inlet amount to the second communicating ring 16, sprays through the atomizing nozzle 15 on the second communicating ring 16, and then performs a third detection through the infrared sensor 14 on the back of the second communicating ring 16 and the front of the third communicating ring 17, and controls the liquid inlet amount to the third communicating ring 17 through the control valve 19, performs three reactions, and then performs a fourth detection through the infrared sensor 14 on the back of the third communicating ring 17 to detect whether the nitrogen oxide content in the flue gas meets the required standard. This refined detection and control method is conducive to improving the full use of ammonia water and ensuring that the nitrogen oxides are reacted as much as possible.

[0026] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited to them. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. An SCR denitration external intelligent ammonia spraying closed-loop control device, comprising a liquid storage tank (1), characterized in that: A closing cover (2) is movably sleeved at a position near the front of the top of the liquid storage tank (1); a first connecting pipe (5) is fixedly sleeved at a position near the back of the closing cover (2) at the top of the liquid storage tank (1); an electrical controller (4) is fixedly connected at a position near the back of the first connecting pipe (5); a main controller (3) is fixedly connected at the back of the electrical controller (4); a control display (12) is fixedly connected at the back of the main controller (3); a connecting block (10) is fixedly connected at a position near one side of the main controller (3); a limiting block (11) is fixedly connected at the front of the connecting block (10) away from the main controller (3); a fixed pipe (8) is fixedly connected at the side of the limiting block (11) away from the main controller (3); a delivery pump (6) is connected at one end of the first connecting pipe (5) away from the liquid storage tank (1); and a second connecting pipe (7) is connected at one end of the delivery pump (6) away from the first connecting pipe (5).

2. The SCR denitration external intelligent ammonia injection closed-loop control device according to claim 1 is characterized in that: A position close to one side of the second connecting pipe (7) is connected to a limiting block (11); a side of the limiting block (11) away from the main controller (3) is fixedly connected to an infrared sensor (14); the infrared sensor (14) is connected to the main controller (3) via a connecting block (10); a side of the limiting block (11) away from the main controller (3) is fixedly connected to a first connecting ring (13), a second connecting ring (16) and a third connecting ring (17).

3. The SCR denitration external intelligent ammonia spraying closed-loop control equipment according to claim 1 is characterized in that: The side of the second connecting pipe (7) away from the main controller (3) is connected to a shunt pipe (18), the shunt pipe (18) is located on the inner side of the limiting block (11), the outer surface of the shunt pipe (18) away from the second connecting pipe (7) is fixedly sleeved with a control valve (19), the side of the control valve (19) away from the second connecting pipe (7) is provided with a fixed block (20), the fixed block (20) is fixedly sleeved with the shunt pipe (18), the fixed block (20) is located on the inner side of the fixed pipe (8), and the fixed block (20) is fixedly sleeved with the shunt pipe (18).

4. The SCR denitration external intelligent ammonia spraying closed-loop control equipment according to claim 1 is characterized in that: The bottom of the main controller (3) is fixedly connected to the liquid storage tank (1), the bottom of the control display (12) is fixedly connected to the liquid storage tank (1), and the front and back of the fixed pipe (8) are fixedly sleeved with connecting flanges (9).

5. The SCR denitration external intelligent ammonia spraying closed-loop control device according to claim 2 is characterized in that: Atomizing nozzles (15) are fixedly connected to the inner sides of the first connecting ring (13), the second connecting ring (16) and the third connecting ring (17); the atomizing nozzles (15) are all inclined and are all oriented toward the inner side of the fixed tube (8) corresponding to a position close to the back; the atomizing nozzles (15) are distributed in a circular manner on the first connecting ring (13), the second connecting ring (16) and the third connecting ring (17) to arrange the lamps.

6. The SCR denitration external intelligent ammonia injection closed-loop control device according to claim 5 is characterized in that: The atomizing nozzle (15) is connected to the shunt pipe (18), and the liquid inflow of the atomizing nozzle (15) on the first connecting ring (13), the second connecting ring (16) and the third connecting ring (17) is controlled by the corresponding control valve (19) on the shunt pipe (18).

7. The SCR denitration external intelligent ammonia spraying closed-loop control device according to claim 2 is characterized in that: Infrared sensors (14) are distributed near the back of the first connecting ring (13), the second connecting ring (16) and the third connecting ring (17), and an infrared sensor (14) is provided near the front of the first connecting ring (13).

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