Automatically-controlled boiler denitration system

Abstract

The invention provides an automatic control boiler denitration system. Comprising a urea supply module, a monitoring sensor module and a DCS linkage control unit, a surge tank dynamic adjusting module is additionally arranged in the urea supply module, the surge tank dynamic adjusting module comprises a urea tank, the liquid outlet end of the urea tank is connected with a urea pump through a urea mother pipe, and the output end of the urea pump is connected with a liquid outlet. Through data comparison before and after transformation, the ratio of a denitration urea spray gun to compressed air can be stably controlled after transformation, urea atomization is more uniform, urea and flue gas are fully mixed and reacted, risks of leakage and the like of a boiler water wall tube wall due to urea corrosion are effectively reduced, and after pressure signals of the two are transmitted to a DCS system, the system is stable in operation. And the labor intensity and the operation working condition of workers are effectively reduced, the matching adjustment condition of the two can be observed in the first time, the operation efficiency of equipment is improved, and meanwhile, chronic corrosion caused by the fact that urea liquid drops adhere to the water cooling wall due to poor atomization is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of gas boiler SNCR systems, and in particular to an automated controlled boiler denitration system. Background Art

[0002] In the selective non-catalytic reduction denitrification system of gas boilers, it is a common process to reduce nitrogen oxide emissions by atomizing the urea solution and mixing it with the flue gas for reaction. Traditional systems usually use a urea pump to transport the urea solution to the denitrification platform, spraying it through a spray gun, and using compressed air to assist in atomization to ensure that the urea droplets are in full contact with the flue gas. The control system monitors the pressure signal and manually or simply automatically adjusts the urea pump frequency or the compressed air valve to maintain the basic atomization effect. However, the coordinated control of urea pressure and compressed air pressure in the existing technology is insufficient in accuracy, mainly relying on manual experience adjustment, and lacks an automated control mechanism for real-time dynamic matching.

[0003] The core problem with existing systems is the inability to precisely match urea pressure with compressed air pressure. On the one hand, insufficient urea pump head leads to unstable delivery pressure, and on the other hand, the lack of strict control over the pressure differential between the two results in poor urea atomization. This makes it difficult to meet the demand for efficient and stable denitrification. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art. The present invention proposes an automatically controlled boiler denitration system.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: an automatically controlled boiler denitration system, including a urea supply module, a monitoring sensor module, and a DCS linkage control unit. A pressure-sustaining tank dynamic adjustment module is added to the urea supply module. The pressure-sustaining tank dynamic adjustment module includes a urea tank. The liquid outlet end of the urea tank is connected to a urea pump through a urea main pipe. The output end of the urea pump is connected to a liquid outlet. The pressure stabilizing tank dynamic adjustment module includes a pressure stabilizing component, a pressure stabilizing tube is further connected to the urea pump, the end of the pressure stabilizing tube is connected to the filter tank, a connecting pipe is provided on the front of the filter tank, the pressure stabilizing tank is installed at the end of the connecting pipe away from the filter tank, the connecting pipe is used to connect the pressure stabilizing tank and the filter tank, a liquid pump is installed on one side of the top of the pressure stabilizing tank, and the bottom end of the liquid pump is connected to the interior of the urea pump through a liquid outlet pipe; An electric three-way valve and a one-way valve are installed on the urea main pipe. The electric three-way valve is used to guide the excess urea solution output by the urea pump into the internal storage of the filter tank. The one-way valve is used to prevent the liquid in the filter tank from flowing back to the urea tank. The liquid pump is used to replenish the liquid in the pressure-stabilizing tank to the inside of the urea pump when the flow rate of the urea main pipe is insufficient.

[0006] Furthermore, the monitoring sensor module is used to monitor the flow of urea solution inside the urea main pipe in real time, and a liquid level sensor is installed inside the surge tank to monitor the urea solution reserve in the surge tank.

[0007] Furthermore, the DCS linkage control unit triggers the liquid pump to start when the urea pump is below a set threshold and the pressure is below a preset value, so as to replenish the urea solution through the pressure-surge tank; When the urea pump exceeds the rated flow rate and the pressure is higher than the upper limit of the pressure difference, the electric three-way valve is triggered to open, and the excess urea solution is stored in the pressure stabilizing tank.

[0008] Furthermore, a pressure supply assembly is installed inside the filter tank, and the pressure supply assembly includes a first filter screen and a second filter screen, which are sequentially embedded in the interior of the filter tank, and the first filter screen and the second filter screen are used to filter the urea solution.

[0009] Furthermore, an auger rod is installed inside the filter tank, the bottom end of the auger rod is connected to a filter bucket, the auger rod and the filter bucket are rotatably connected inside the filter tank, and a filter groove is provided at the bottom end of the filter bucket.

[0010] Furthermore, a transmission rod is embedded in the interior of the pressure stabilizing tank, and the bottom end of the transmission rod is connected to a sealing plug. An upper pressing plate and a lower pressing plate are also embedded in the interior of the pressure stabilizing tank. The upper pressing plate is arranged on the top surface of the sealing plug, and the lower pressing plate is arranged on the bottom surface of the sealing plug.

[0011] Furthermore, the upper pressing plate and the lower pressing plate are movably connected to the inner wall of the pressure stabilizing tank, a connecting rod is connected between the upper pressing plate and the lower pressing plate, and the transmission rod passes through the interior of the connecting rod.

[0012] Furthermore, the edge of the sealing plug is connected by a flexible film, and the urea solution is transported to the bottom end of the pressure-regulating tank through a connecting pipe. The urea solution pushes the flexible film to fold upward, and the urine solution is discharged from the top of the pressure-regulating tank into the interior of the liquid pump.

[0013] Furthermore, the DCS linkage control unit controls the pressure difference between the compressed air pressure and the urea pressure to be 0.03-0.06 MPa.

[0014] Furthermore, when the urea pump is below a set threshold and the pressure is lower than a preset value, the upper pressing piece is attached to the top surface of the sealing plug, and the lower pressing piece and the sealing plug are separated. When the urea pump exceeds the rated flow and the pressure is higher than the upper limit of the pressure difference, the lower pressing piece is attached to the bottom end of the sealing plug, and the upper pressing piece and the sealing plug are separated.

[0015] Compared with the existing technology, the present invention has the following beneficial effects: after comparing data before and after the transformation, the ratio of the denitrification urea spray gun to compressed air can be stably controlled, making the urea atomization more uniform and fully mixed with the flue gas. It also effectively reduces the risk of urea corrosion and leakage on the boiler water-cooled wall tube. After the pressure signals of the two are transmitted to the DCS system, the labor intensity and operating conditions of employees are effectively reduced, and the matching adjustment between the two can be observed immediately, thereby improving the operating efficiency of the equipment. Secondly, by adding a dynamic adjustment module for a surge tank to the urea supply module, a fully closed-loop control system with flow monitoring, pressure compensation, graded filtration, and dynamic adjustment was established. This fundamentally solves the core problem of the poor matching between urea pressure and compressed air pressure in traditional denitrification systems. Through the linkage design of the surge tank and the liquid pump, when the flow rate of the urea main pipe is insufficient, the surge tank can quickly release the reserve solution to replenish the pressure, reducing the average particle size of the urea solution atomized particles, improving the mixing efficiency with the flue gas, and significantly increasing the nitrogen oxide removal rate. At the same time, it avoids the chronic corrosion caused by urea droplets adhering to the water-cooled wall due to poor atomization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure of the present invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them: Figure 1 Schematically shows a three-dimensional structural diagram of an automated controlled boiler denitration system proposed according to one embodiment of the present invention; Figure 2 Schematically shows the overall structure of an automated controlled boiler denitration system proposed according to one embodiment of the present invention; Figure 3 Schematically shows the structure of a pressure-stabilizing tube and a filter tank in an automated controlled boiler denitration system according to one embodiment of the present invention; Figure 4 Schematically shows the structure of a pressure stabilizing tube and a pressure stabilizing tank in an automated controlled boiler denitration system according to one embodiment of the present invention; Figure 5 Schematically showing a cross-sectional structural diagram of a filter tank and a pressure-surge tank in an automated controlled boiler denitration system according to one embodiment of the present invention; Figure 6 Schematically showing the structure of a first filter and a second filter in an automated controlled boiler denitration system according to one embodiment of the present invention; Figure 7The schematic diagram shows the structure of the upper pressing plate and the connecting rod in an automated controlled boiler denitration system according to one embodiment of the present invention.

[0017] In the figure: 11. Urea tank; 12. Urea main pipe; 13. Urea pump; 14. Liquid outlet; 2. Pressure stabilizing assembly; 21. Pressure stabilizing tube; 22. Pressure stabilizing tank; 23. Liquid pump; 25. Filter tank; 26. Connecting pipe; 3. Pressure supply assembly; 31. First filter screen; 32. Second filter screen; 33. Auger rod; 34. Filter bucket; 35. Transmission rod; 36. Upper pressure plate; 37. Sealing plug; 38. Lower pressure plate; 39. Connecting rod. DETAILED DESCRIPTION

[0018] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the present invention.

[0019] according to Figure 1-Figure 7 The automated boiler denitrification system provided by the present invention includes a urea supply module, a monitoring sensor module, and a DCS linkage control unit. A dynamic pressure-surge tank adjustment module is added to the urea supply module. The dynamic pressure-surge tank adjustment module includes a urea pump 13. The liquid outlet of the urea pump 13 is connected to the spray gun front pipeline via a urea main pipe 12. The output end of the spray gun front pipeline is connected to a liquid outlet 14, which is used to transport urea solution into the furnace to participate in the denitrification reaction.

[0020] The boiler denitrification platform is 14.2 meters high. The original urea discharge pump had a head of 49 meters. Due to insufficient head output, and to prevent compressed air backflow from affecting the denitrification system's operation, the two 49-meter head pumps were replaced with urea pumps 13 with a head of 95 meters. However, due to compressed air fluctuations or pump frequency adjustments, it was impossible to immediately monitor the pressures of both. Therefore, an electric regulating valve and pressure transmitter were installed on the denitrification system's compressed air main pipe. To facilitate future valve inspection and maintenance, manual bypass valves were installed at the valve's inlet and outlet. A pressure transmitter was also installed on the denitrification platform. A monitoring sensor module monitors the flow of urea solution within the urea main pipe 12 in real time. A liquid level sensor is installed inside the surge tank 22 to monitor the urea solution level within the tank. This transmits the compressed air and urea pressures to the main control DCS screen, allowing operators to immediately monitor the pressure difference and make timely adjustments.

[0021] The DCS-linked control unit triggers liquid pump 23 to activate when the flow rate in the pipeline preceding the spray gun falls below a set threshold and the pressure falls below a preset value, replenishing urea solution through the surge tank 22 while maintaining a pressure differential between the compressed air and urea pressures between 0.03 and 0.06 MPa. When the flow rate in the pipeline preceding the spray gun exceeds the rated flow rate and the pressure exceeds the upper pressure differential limit, the electric three-way valve is triggered to open, storing excess urea solution in the surge tank 22. This ensures that the compressed air pressure is 0.03-0.06 MPa below the urea pressure, maintaining optimal atomization at the urea spray gun within this range. This ensures thorough mixing of the urea solution with the flue gas, effectively reducing nitrogen oxide levels and the risk of chronic corrosion of the boiler water wall caused by poor urea atomization. During operation, single adjustments must be made. Simultaneously adjusting the compressed air and urea pump 13 frequency would not only affect the atomization of the urea solution but also compromise the safe operation of the water wall, leading to unstable denitration system operation and exceeding environmental performance standards.

[0022] To ensure the stability of the urea solution supply, a pressure stabilizing assembly 2 is provided to provide a stable supply pressure, ensuring that the urea spray gun connected to the end of the liquid outlet 14 is atomized in an optimal state and achieving sufficient mixing of the flue gas and urea. The pressure stabilizing tank dynamic adjustment module includes a pressure stabilizing assembly 2. A pressure stabilizing tube 21 is also connected to the urea pump 13. The end of the pressure stabilizing tube 21 is connected to a filter tank 25. A connecting pipe 26 is provided on the front of the filter tank 25. The end of the connecting pipe 26 away from the filter tank 25 is installed with a pressure stabilizing tank 22 for connecting the pressure stabilizing tank 22 and the filter tank 25. A liquid pump 23 is installed on one side of the top of the pressure stabilizing tank 22. The bottom end of the liquid pump 23 is connected to the interior of the pipeline before the spray gun via a liquid outlet pipe.

[0023] An electric three-way valve and a one-way valve are installed on the urea main pipe 12. The electric three-way valve is used to guide the excess urea solution output by the urea pump 13 into the internal storage of the filter tank 25. The one-way valve is used to prevent the liquid in the filter tank 25 from flowing back to the urea tank 11. The liquid pump 23 is used to replenish the liquid in the pressure-stabilizing tank 22 to the inside of the pipeline before the spray gun when the flow rate of the urea main pipe 12 is insufficient.

[0024] During the urea solution supply process, the solution stored in the urea tank 11 is transported via the urea main pipe 12 to the urea pump 13, where it is sprayed out of the liquid outlet 14. If the flow rate drawn from the urea main pipe 12 by the urea pump 13 is insufficient, the flow rate decreases, leading to a drop in pressure. At this point, the surge tank 22 replenishes the flow rate, restoring both the flow rate and pressure to a stable level. If the flow rate drawn from the urea main pipe 12 by the urea pump 13 falls below 80% of the rated value and the main pipe pressure drops below 0.3 MPa, the electromagnetic flowmeter installed on the main pipe detects the sudden drop in flow rate in real time. The DCS system immediately triggers the pressure stabilization assembly 2 to activate the liquid pump 23 and open the outlet valve of the surge tank 22. The urea solution stored in the tank enters the filter tank 25 through the connecting pipe 26. After dual filtration through the 50μm first filter 31 and the 20μm second filter 32, the liquid pump 23 pressurizes the solution to the current main pipe pressure and then supplies it to the spray gun pipeline via the surge pipe 21. During the rehydration process, a level sensor monitors the liquid level in surge tank 22 in real time. If the level falls below 20%, the pump automatically stops to prevent idling and cavitation. A check valve at the inlet of filter tank 25 prevents the backflow of high-pressure liquid from the main pipe. The auger 33 simultaneously pushes intercepted impurities to the filter bucket 34 for temporary storage, preventing blockage in the rehydration path. The volume of surge tank 22 is designed to hold 15% of the system's maximum minute flow rate. A single rehydration can maintain emergency flow for over 30 seconds, allowing time for pump switching or pipeline clearing. This cycle completes until the main pipe flow rate returns to 95% of the rated value and the pressure stabilizes between 0.35 and 0.6 MPa, completing the dynamic compensation cycle.

[0025] This design controls the pressure drop rate from 0.1 MPa / s to within 0.01 MPa / s, reducing differential pressure fluctuations by 80%, ensuring that the spray gun atomization differential pressure remains within the optimal range of 0.03-0.06 MPa. The average atomized particle size is reduced by 40%, NOx removal efficiency is increased by 5%-8%, the frequency of water-cooled wall corrosion due to poor atomization is reduced from 4 times per year to ≤1 time per year, and the risk of leakage is reduced by 75%. Furthermore, precise fluid replenishment avoids the over-injection compensation required by traditional systems, significantly reducing urea unit consumption. If a sudden failure of the urea pump 13 results in insufficient pressure supply, the surge tank 22 can independently maintain emergency flow for 3-5 minutes, shortening the duration of NOx concentration exceeding the standard to less than 1 minute. Combined with the automatic slag discharge function, maintenance workload is reduced by 40%, and the life of key components is extended by 20%-30%. This significantly improves system stability, economy, and safety, making it particularly suitable for efficient denitrification under high-load and fluctuating operating conditions.

[0026] Furthermore, after the filtered urea solution flows from the filter tank 25 into the pressure-surge tank 22, the positions of the upper and lower pressure plates 36 and 38 are adjusted to achieve different operating environments. A pressure supply assembly 3 is installed within the filter tank 25. This assembly comprises a first filter screen 31 and a second filter screen 32, which are sequentially inserted into the filter tank 25 to perform graded filtration of the urea solution. An auger rod 33 is also installed within the filter tank 25. Its bottom end is connected to a filter bucket 34, which is rotatably connected to the interior of the filter tank 25. A filter slot is defined at the bottom of the filter bucket 34.

[0027] A transmission rod 35 is embedded within the surge tank 22, with its bottom end connected to a sealing plug 37. Also embedded within the surge tank 22 are an upper pressure plate 36 and a lower pressure plate 38, located on the top and bottom surfaces of the sealing plug 37, respectively. These plates are linked to the sealing plug 37 via a connecting rod 39, through which the transmission rod 35 extends. The edge of the sealing plug 37 is connected to the inner wall of the surge tank 22 via a flexible film. When urea solution is delivered to the bottom end of the surge tank 22 through the connecting tube 26, the flexible film is pushed upward, causing the solution to be discharged from the top of the surge tank 22 into the interior of the liquid pump 23. When the flow rate of the pipeline in front of the spray gun is lower than the set threshold and the pressure is lower than the preset value, the upper pressing piece 36 is attached to the top surface of the sealing plug 37, and the lower pressing piece 38 is separated from the sealing plug 37, so that the solution in the pressure-regulating tank 22 is quickly discharged; when the flow rate of the pipeline in front of the spray gun exceeds the rated flow rate and the pressure is higher than the upper limit of the pressure difference, the lower pressing piece 38 is attached to the bottom end of the sealing plug 37, and the upper pressing piece 36 is separated from the sealing plug 37, guiding the excess solution into the pressure-regulating tank 22 for storage.

[0028] The filter tank 25 has an integrated double-layer filtration structure and impurity pushing assembly: the first filter 31 and the second filter 32 are embedded in the middle of the filter tank 25 with pore sizes of 50μm and 20μm, respectively, forming a graded filtration layer to intercept impurities in the urea solution flowing out of the pressure-surge tank 22; the auger rod 33 vertically penetrates the two layers of filter screens and is rotatably connected to the filter bucket 34 at the bottom. The bottom of the filter bucket 34 has a strip filter groove, the groove width of which matches the mesh of the second filter screen 32 to ensure that only qualified solution passes through. When the solution flows through the filter tank 25, large particles of impurities such as urea crystals and welding slag are intercepted by the first filter screen 31, and tiny particles are captured by the second filter screen 32. The auger rod 33 rotates slowly under the drive of the motor, continuously pushing the intercepted impurities to the filter bucket 34 for temporary storage to avoid clogging the filter screen.

[0029] A dynamic pressure regulating mechanism is constructed inside the pressure stabilizing tank 22 through a transmission rod 35, an upper pressure plate 36, a lower pressure plate 38 and a sealing plug 37: the transmission rod 35 passes through the top of the pressure stabilizing tank 22, and the bottom end is fixedly connected to the sealing plug 37. The edge of the sealing plug 37 is connected to the inner wall of the tank through a flexible rubber sheet to form a sealed cavity that can float up and down; the upper pressure plate 36 and the lower pressure plate 38 are linked to the sealing plug 37 through a connecting rod 39. When the urea solution enters the bottom end of the pressure-surge tank 22 through the connecting pipe 26, the liquid pushes the flexible film to fold upward, and the solution enters the inner cavity of the tank from the gap at the edge of the sealing plug 37 and flows into the liquid pump 23 through the top outlet; when the system detects that the flow of the urea main pipe 12 is insufficient and the pressure is too low, the upper pressing piece 36 moves downward under the control of the DCS system, fits the top surface of the sealing plug 37, opens the gap between the lower pressing piece 38 and the sealing plug 37, and quickly discharges the solution in the pressure-surge tank 22; when the flow is too large and the pressure is too high, the lower pressing piece 38 moves upward to fit the bottom surface of the sealing plug 37, and the upper pressing piece 36 separates, guiding the excess solution into the pressure-surge tank 22 for storage.

[0030] The dynamic pressure regulation mechanism constructed within the surge tank 22 of the present invention achieves adaptive, precise control and flexible buffering of the urea solution pressure through the coordinated design of the transmission rod 35, upper and lower pressure plates 36, 38, and sealing plug 37. The sealing plug 37, connected by a flexible rubber sheet, forms a floating sealed cavity. When the urea solution enters the bottom of the surge tank through the connecting pipe 26, the liquid pressure automatically pushes the rubber sheet to fold, allowing it to flow unimpeded into the tank cavity. This avoids the problem of traditional mechanical valves being blocked by crystals or impurities, ensuring smooth solution flow.

[0031] The DCS system achieves rapid response under different operating conditions by controlling the position switching of the upper pressure plate 36 and the lower pressure plate 38: when the flow rate is insufficient, the upper pressure plate abuts the top surface of the sealing plug, forcing the downward pressure channel to open, allowing the reserve liquid to quickly replenish into the main pipe at a flow rate of 0.2m / s, avoiding the impact of a sudden pressure drop on the atomization effect; when the flow rate is too large, the lower pressure plate abuts the bottom surface of the sealing plug, accurately controlling the opening of the upper pressure channel, stabilizing the excess solution storage rate at 1.2m³ / h, and preventing high pressure from impacting the water-cooled wall.

[0032] This mechanism achieves flexible buffering of system pressure through the dynamic change of the sealed chamber volume, eliminating the pressure shock associated with traditional rigid valve adjustment and extending the service life of the liquid pump 23 and spray gun. Furthermore, the design of the flexible film and linked pressure plate eliminates the need for an additional power source; state switching is accomplished solely through liquid pressure and DCS signals, reducing system energy consumption and maintenance costs, and significantly improving the stability and reliability of the denitrification system under load fluctuations.

[0033] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. An automated boiler denitrification system, comprising a urea supply module, a monitoring sensor module, and a DCS linkage control unit, characterized in that: A pressure stabilizing tank dynamic adjustment module is added to the urea supply module. The pressure stabilizing tank dynamic adjustment module includes a urea tank. The liquid outlet of the urea tank is connected to a urea pump through a urea main pipe. The output end of the urea pump is connected to a liquid outlet. The pressure stabilizing tank dynamic adjustment module includes a pressure stabilizing component, a pressure stabilizing tube is further connected to the urea pump, the end of the pressure stabilizing tube is connected to the filter tank, a connecting pipe is provided on the front of the filter tank, the pressure stabilizing tank is installed at the end of the connecting pipe away from the filter tank, the connecting pipe is used to connect the pressure stabilizing tank and the filter tank, a liquid pump is installed on one side of the top of the pressure stabilizing tank, and the bottom end of the liquid pump is connected to the interior of the urea pump through a liquid outlet pipe; An electric three-way valve and a one-way valve are installed on the urea main pipe. The electric three-way valve is used to guide the excess urea solution output by the urea pump into the internal storage of the filter tank. The one-way valve is used to prevent the liquid in the filter tank from flowing back to the urea tank. The liquid pump is used to replenish the liquid in the pressure-stabilizing tank to the inside of the urea pump when the flow rate of the urea main pipe is insufficient.

2. The automated boiler denitration system according to claim 1, characterized in that: The monitoring sensor module is used to monitor the flow of urea solution inside the urea main pipe in real time. A liquid level sensor is installed inside the pressure stabilizing tank to monitor the urea solution storage in the pressure stabilizing tank.

3. The automated boiler denitration system according to claim 1, characterized in that: The DCS linkage control unit triggers the liquid pump to start when the urea pump is below a set threshold and the pressure is below a preset value, and replenishes the urea solution through the pressure-surge tank; When the urea pump exceeds the rated flow rate and the pressure is higher than the upper limit of the pressure difference, the electric three-way valve is triggered to open, and the excess urea solution is stored in the pressure stabilizing tank.

4. The automated boiler denitration system according to claim 1, characterized in that: A pressure supply assembly is installed inside the filter tank. The pressure supply assembly includes a first filter screen and a second filter screen. The first filter screen and the second filter screen are sequentially embedded in the filter tank. The first filter screen and the second filter screen are used to filter the urea solution.

5. The automated boiler denitration system according to claim 4, characterized in that: An auger rod is also installed inside the filter tank, and the bottom end of the auger rod is connected to a filter bucket. The auger rod and the filter bucket are rotatably connected inside the filter tank, and a filter groove is provided at the bottom end of the filter bucket.

6. The automated boiler denitration system according to claim 1, characterized in that: A transmission rod is embedded in the pressure stabilizing tank, and a sealing plug is connected to the bottom end of the transmission rod. An upper pressing plate and a lower pressing plate are also embedded in the pressure stabilizing tank. The upper pressing plate is arranged on the top surface of the sealing plug, and the lower pressing plate is arranged on the bottom surface of the sealing plug.

7. The automated boiler denitration system according to claim 6, characterized in that: The upper pressing plate and the lower pressing plate are movably connected to the inner wall of the pressure stabilizing tank. A connecting rod is connected between the upper pressing plate and the lower pressing plate, and the transmission rod passes through the interior of the connecting rod.

8. The automated boiler denitration system according to claim 7, characterized in that: The edge of the sealing plug is connected by a flexible film. The urea solution is transported to the bottom end of the pressure-regulating tank through a connecting pipe. The urea solution pushes the flexible film to fold upward, and the urine solution is discharged from the top of the pressure-regulating tank into the interior of the liquid pump.

9. The automated boiler denitration system according to claim 3, characterized in that: The DCS linkage control unit controls the pressure difference between the compressed air pressure and the urea pressure to be 0.03-0.06 MPa.

10. The automated boiler denitration system according to claim 8, characterized in that: When the urea pump is below the set threshold and the pressure is lower than the preset value, the upper pressing piece is attached to the top surface of the sealing plug, and the lower pressing piece and the sealing plug are separated. When the urea pump exceeds the rated flow and the pressure is higher than the upper limit of the pressure difference, the lower pressing piece is attached to the bottom end of the sealing plug, and the upper pressing piece and the sealing plug are separated.

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