Ammonia water delivery system for flue gas denitration

Abstract

The utility model discloses ammonia water conveying system for flue gas denitration, including ammonia water solution storage tank, desalted water main pipe, the liquid outlet of ammonia water solution storage tank is connected with ammonia water conveying main pipe, and the liquid outlet of ammonia water conveying branch pipe is connected with ammonia water conveying branch pipe on ammonia water conveying main pipe, and the liquid outlet of ammonia water conveying branch pipe is provided with venturi mixer, and the liquid outlet of desalted water main pipe is connected with desalted water conveying main pipe, and the liquid outlet of desalted water conveying branch pipe is connected with desalted water conveying branch pipe on desalted water conveying main pipe, and desalted water conveying branch pipe is linked together with venturi mixer, wherein the liquid outlet of venturi mixer is linked together with the liquid inlet of spare metering pump, and the liquid outlet of remaining venturi mixer all is provided with main metering pump spare, the utility model discloses venturi mixer replaces traditional stirring device, and utilizes venturi effect to realize ammonia water and desalted water fast, fully mix, avoid mixing blind area, solve and mix long period, local uneven problem.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification technology, and in particular to an ammonia water delivery system for flue gas denitrification. Background Technology

[0002] In industrial production, ammonia water is widely used as an important raw material in processes such as denitrification. In selective catalytic reduction (SCR) denitrification systems, ammonia water needs to be transported to an evaporation system, where it evaporates and reacts with flue gas to remove nitrogen oxides, achieving environmentally friendly emissions. Therefore, the stability, reliability, and safety of the ammonia water storage and supply system are crucial to the entire production process.

[0003] Chinese utility model patent with announcement number CN209501323U discloses a denitrification ammonia water conveying device for a waste incinerator, including an ammonia water raw solution storage tank and a dilution water storage tank. The ammonia water raw solution storage tank is connected to an ammonia water raw solution conveying pipeline on its right side. The ammonia water raw solution conveying pipeline is equipped with a filtration device, which includes a filter box. The filter box is equipped with a first filter screen and a second filter screen.

[0004] It uses a stirred tank as the mixing device, relying on a stirring motor to drive the stirring rod and blades to mix the ammonia stock solution with the dilution water. Mechanical stirring has the problem of long mixing cycles, especially when the load of the waste incinerator changes suddenly, it is difficult to quickly adjust the ammonia concentration, which may lead to a lag in denitrification efficiency and affect the real-time compliance of pollutant emissions.

[0005] In addition, the fluid velocity is high near the stirring blades, and flow blind zones are easily formed at the edge or bottom of the tank, resulting in insufficient local mixing. This may cause uneven concentration of sprayed ammonia water and reduce the efficiency of the denitrification reaction. Utility Model Content

[0006] The purpose of this invention is to provide an ammonia water delivery system for flue gas denitrification, in order to solve the technical problem of low efficiency in existing denitrification systems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The ammonia water delivery system for flue gas denitrification includes an ammonia solution storage tank, a demineralized water main pipe, and an air compressor. The outlet of the ammonia solution storage tank is connected to the main ammonia water delivery pipeline, which in turn connects to multiple branch ammonia water delivery pipelines. Each branch ammonia water delivery pipeline has a Venturi mixer at its outlet, and the outlet of each branch ammonia water delivery pipeline is connected to one of the inlets of the Venturi mixer. The outlet of the demineralized water main pipe is connected to the main demineralized water delivery pipeline, which in turn connects to several branch demineralized water delivery pipelines. The outlet of the channel is connected to another inlet of the Venturi mixer. The outlet of one of the Venturi mixers is connected to the inlet of the standby metering pump. The outlets of the remaining Venturi mixers are each equipped with a main metering pump. The outlets of the Venturi mixers are connected to the inlets of their corresponding main metering pumps. The outlets of the main metering pumps are connected to the main delivery pipeline. A spray gun is installed at the outlet of the main delivery pipeline. The outlet of the main delivery pipeline is connected to the inlet of the spray gun. The outlet of the air compressor is connected to the inlet of the spray gun through an air delivery pipe.

[0009] The outlet of the standby metering pump is connected to the main delivery pipeline via a pipeline assembly.

[0010] As a preferred embodiment of this utility model, the pipeline assembly includes a backup main pipeline and backup branch pipelines. One end of the backup main pipeline is connected to the outlet of the backup metering pump. Several backup branch pipelines are provided, one end of which is connected to the backup main pipeline, and the other end of which is connected to the corresponding main pipeline.

[0011] As a preferred embodiment of this utility model, a first valve is installed on the main conveying pipeline, and a second valve is installed on the standby conveying branch pipeline.

[0012] As a preferred embodiment of this utility model, a first regulating valve is installed on the ammonia water conveying branch pipeline, and a second regulating valve is installed on the demineralized water conveying branch pipeline.

[0013] As a preferred embodiment of this utility model, pulse damping buffers are installed on both the backup main conveying pipeline and the main conveying pipeline.

[0014] As a preferred embodiment of this utility model, a first filter is provided between the ammonia solution storage tank and the main ammonia delivery pipeline. The inlet of the first filter is connected to the outlet of the ammonia solution storage tank, and the outlet of the first filter is connected to the inlet of the main ammonia delivery pipeline.

[0015] As a preferred embodiment of this utility model, a rotor flow meter is installed on the main conveying pipeline.

[0016] As a preferred embodiment of this utility model, a solenoid valve is installed on the main conveying pipeline, and the solenoid valve is located between the rotor flow meter and the spray gun.

[0017] As a preferred embodiment of this utility model, the air compressor outlet is provided with a second filter, and the outlet of the second filter is connected to the inlet of the air supply pipe.

[0018] Compared with existing technologies, the ammonia water delivery system for flue gas denitrification provided by this utility model has the following advantages:

[0019] A Venturi mixer is used instead of a traditional stirring device. Utilizing the Venturi effect, it achieves rapid and thorough mixing of ammonia and demineralized water, avoiding mixing blind spots and solving problems such as long mixing cycles and localized unevenness. Backup metering pumps, backup delivery pipelines, and valves are installed, allowing for rapid switching in case of main metering pump failure, ensuring continuous and stable system operation and uninterrupted denitrification work.

[0020] The flow rates of ammonia and demineralized water are regulated by regulating valves to achieve precise control of the concentration of diluted ammonia solution, adapting to denitrification requirements under different operating conditions. Pulse damping buffers reduce pressure and flow fluctuations in the pipeline, protecting equipment and reducing the risk of damage; filters remove impurities, preventing equipment blockage and ensuring normal system operation. Rotor flow meters monitor flow in real time, and solenoid valves enable emergency shut-off. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0023] Figure label:

[0024] 1. Ammonia solution storage tank; 101. First filter; 102. Main ammonia water delivery pipeline; 103. Branch ammonia water delivery pipeline; 104. First regulating valve; 2. Demineralized water main pipe; 201. Main demineralized water delivery pipeline; 202. Branch demineralized water delivery pipeline; 203. Second regulating valve; 3. Venturi mixer; 4. Standby metering pump; 401. Standby main delivery pipeline; 402. Standby branch delivery pipeline; 403. Second valve; 5. Main metering pump; 501. Main delivery pipeline; 502. First valve; 503. Rotor flow meter; 504. Solenoid valve; 6. Spray gun; 7. Air compressor; 701. Second filter; 702. Air delivery pipe; 8. Pulse damping buffer; 9. Calibration column. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0026] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present invention should be understood according to the specific circumstances.

[0028] See Figure 1 As shown, the ammonia water delivery system for flue gas denitrification in this embodiment includes an ammonia water storage tank 1, a demineralized water main pipe 2, and an air compressor 7. The outlet of the ammonia water storage tank 1 is connected to the main ammonia water delivery pipeline 102. Multiple ammonia water delivery branch pipes 103 are connected to the main ammonia water delivery pipeline 102. A Venturi mixer 3 is installed at the outlet of each ammonia water delivery branch pipe 103. The outlet of the ammonia water delivery branch pipe 103 is connected to one of the inlets of the Venturi mixer 3. The outlet of the demineralized water main pipe 2 is connected to the main demineralized water delivery pipeline 201. Several demineralized water delivery branch pipes 202 are connected to the main demineralized water delivery pipeline 201. The outlet of the demineralized water delivery branch pipe 202 is connected to another inlet of the Venturi mixer 3. The outlet of one of the Venturi mixers 3 is connected to the inlet of the standby metering pump 4. The outlets of the remaining Venturi mixers 3 are each equipped with a main metering pump 5. The outlet of the Venturi mixer 3 is connected to the inlet of the corresponding main metering pump 5. The outlet of the main metering pump 5 is connected to the main delivery pipe 501. A spray gun 6 is installed at the outlet of the main delivery pipe 501. The outlet of the main delivery pipe 501 is connected to the inlet of the spray gun 6. The outlet of the air compressor 7 is connected to the inlet of the spray gun 6 through the air delivery pipe 702.

[0029] The outlet of the standby metering pump 4 is connected to the main delivery pipeline 501 via a pipeline assembly.

[0030] In operation, ammonia solution storage tank 1 stores ammonia solution. The ammonia solution is then distributed to multiple ammonia solution branch pipes 103 via the main ammonia solution delivery pipeline 102. Utilizing the Venturi effect of the Venturi mixer 3, the demineralized water and ammonia solution entering the Venturi mixer 3 are thoroughly mixed, resulting in complete dilution of the ammonia solution. The diluted ammonia solution is then output from the main metering pump 5 and delivered to the spray gun 6 via the main delivery pipeline 501. The air compressor 7 compresses air and supplies compressed air to the spray gun 6 through the air supply pipe 702, assisting the spray gun 6 in atomizing and spraying the diluted ammonia solution for flue gas denitrification. If one of the main metering pumps 5 fails, the backup metering pump 4 is activated as a backup to ensure continuous and stable operation of the system.

[0031] The pipeline assembly includes a backup main pipeline 401 and a backup branch pipeline 402. One end of the backup main pipeline 401 is connected to the outlet of the backup metering pump 4. Several backup branch pipelines 402 are provided. One end of the backup branch pipeline 402 is connected to the backup main pipeline 401, and the other end of the backup branch pipeline 402 is connected to the corresponding main pipeline 501.

[0032] When the main metering pump 5 malfunctions, the standby metering pump 4 starts working. The diluted ammonia solution it outputs is distributed through the standby main pipeline 401 and then through multiple standby branch pipelines 402, which are connected to the corresponding main pipeline 501. This ensures that the diluted ammonia solution is delivered to the main pipeline 501 system where the spray gun 6 is located, thus guaranteeing a continuous supply of diluted ammonia solution and maintaining the flue gas denitrification operation.

[0033] A first valve 502 is installed on the main conveying pipeline 501, and a second valve 503 is installed on the backup conveying branch pipeline 402.

[0034] When the standby metering pump 4 is not needed, the standby delivery branch pipe 402 is closed to prevent the liquid in the main delivery pipe 501 from flowing back into the standby delivery branch pipe 402. When the standby metering pump 4 is activated, the standby delivery branch pipe 402 is opened, and the first valve 502 is closed at the same time to block the connection between the main delivery pipe 501 and the main metering pump 5, so that the diluted ammonia solution output by the standby metering pump 4 can smoothly enter the spray gun 6 through the main delivery pipe 501.

[0035] A first regulating valve 104 is installed on the ammonia water conveying branch pipeline 103, and a second regulating valve 203 is installed on the demineralized water conveying branch pipeline 202.

[0036] The first regulating valve 104 is installed on the ammonia water delivery branch pipe 103. It adjusts the flow rate of ammonia water in the ammonia water delivery branch pipe 103 according to the actual denitrification process requirements for the ammonia water ratio in the diluted ammonia water solution, thereby controlling the ammonia water flow rate entering the Venturi mixer 3. Similarly, the second regulating valve 203 is installed on the demineralized water delivery branch pipe 202. It is used to regulate the flow rate of demineralized water in the demineralized water delivery branch pipe 202, precisely controlling the flow rate of demineralized water entering the Venturi mixer 3, thus achieving precise control of the concentration of the diluted ammonia water solution to meet the requirements of flue gas denitrification under different operating conditions.

[0037] Both the backup main conveying pipeline 401 and the main conveying pipeline 501 are equipped with pulse damping buffers 8.

[0038] The pulse damping buffer 8 operates by utilizing the compressibility of the gas within the chamber. When the main metering pump 5 or the standby metering pump 4 is operating, the pump's operation causes pulsations in the liquid. During the discharge stroke, the gas inside the pulse damping buffer 8 is compressed, storing a portion of the pumped liquid and reducing the flow peak. During the pump's suction stroke, the air inside the pulse damping buffer 8 expands, and the internal liquid flows out, replenishing the pipeline flow and increasing the pipeline flow trough. This reduces fluctuations in liquid pressure and flow in the main delivery pipeline 501 and the standby main delivery pipeline 401, making liquid delivery smoother, protecting pipelines and related equipment, and reducing the risk of damage caused by pulsations.

[0039] A first filter 101 is installed between the ammonia solution storage tank 1 and the ammonia water conveying main pipeline 102. The inlet of the first filter 101 is connected to the outlet of the ammonia solution storage tank 1, and the outlet of the first filter 101 is connected to the inlet of the ammonia water conveying main pipeline 102.

[0040] The first filter 101 primarily operates through a physical filtration mechanism. After flowing from the ammonia solution storage tank 1, the ammonia solution enters the first filter 101. Utilizing the pore size of the filter material, suspended particles and impurities larger than the pore size are blocked through sieving. Particles in the fluid, due to inertia, deviate from the streamlines, colliding with the filter material fibers and being captured. Tiny particles, due to Brownian motion, deviate from the streamlines, colliding with the filter material fibers and being captured through diffusion. Particulate matter is directly intercepted by the filter material fibers. The clean ammonia solution filtered by the first filter 101 then flows into the main ammonia delivery pipeline 102, preventing impurities from entering the pipeline system and avoiding damage or blockage to subsequent equipment such as the Venturi mixer 3 and metering pumps, thus ensuring the normal operation of the system.

[0041] A rotor flow meter 503 is installed on the main conveying pipeline 501, and a solenoid valve 504 is installed on the main conveying pipeline 501. The solenoid valve 504 is located between the rotor flow meter 503 and the spray gun 6.

[0042] The rotor flowmeter 503 is installed on the main delivery pipeline 501. It measures the fluid flow rate by measuring the rotor's position when the force exerted by the fluid on the rotor is balanced with the rotor's gravity and buoyancy. It monitors in real time the flow rate of the diluted ammonia solution output from the main metering pump 5 and flowing to the spray gun 6, providing flow data for system operation so that the operating parameters of the main metering pump 5 and other equipment can be adjusted according to the denitrification process requirements. The solenoid valve 504 is located between the rotor flowmeter 503 and the spray gun 6. It can receive signals from the control system. When the system malfunctions or needs to be stopped urgently from delivering diluted ammonia solution to the spray gun 6, the control system sends a signal to quickly close the solenoid valve 504, cutting off the flow of diluted ammonia solution to the spray gun 6, thus providing safety protection and controlling the delivery.

[0043] The air compressor 7 has a second filter 701 installed at its outlet, and the outlet of the second filter 701 is connected to the inlet of the air supply pipe 702. Air compressed by the air compressor 7 flows out of the outlet and into the second filter 701. The second filter 701 also utilizes a physical filtration mechanism, removing dust and impurities from the compressed air through sieving, inertial impaction, diffusion, and interception. The clean compressed air purified by the second filter 701 is then delivered to the spray gun 6 through the air supply pipe 702, preventing impurities from entering the spray gun 6 and avoiding any impact on its normal operation. This ensures that the compressed air effectively assists the spray gun 6 in atomizing and spraying the diluted ammonia solution, thereby improving the denitrification effect of the flue gas.

[0044] One end of the main ammonia water delivery pipeline 102 is connected to a calibration column 9. The ammonia water flow rate can be calibrated through the metering or detection elements inside the calibration column 9, the concentration can be detected by the sampling port, the pressure can be monitored by the pressure sensor, and the system maintenance and fault diagnosis can be assisted to ensure the stable and accurate operation of the ammonia water delivery system.

[0045] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. An ammonia water delivery system for flue gas denitrification, characterized in that: The system includes an ammonia solution storage tank (1), a demineralized water main pipe (2), and an air compressor (7). The outlet of the ammonia solution storage tank (1) is connected to an ammonia water main pipeline (102). Multiple ammonia water branch pipes (103) are connected to the main ammonia water main pipeline (102). A Venturi mixer (3) is installed at the outlet of each ammonia water branch pipe (103). The outlet of the ammonia water branch pipe (103) is connected to one of the inlets of the Venturi mixer (3). The outlet of the demineralized water main pipe (2) is connected to a demineralized water main pipeline (201). Several demineralized water branch pipes (202) are connected to the main demineralized water main pipeline (201). The outlet of the demineralized water branch pipes (202) is connected to the main demineralized water main pipeline (201). The outlet of one of the Venturi mixers (3) is connected to the other inlet of the Venturi mixer (3), and the outlet of one of the Venturi mixers (3) is connected to the inlet of the backup metering pump (4). The outlet of the remaining Venturi mixers (3) is provided with a main metering pump (5). The outlet of the Venturi mixer (3) is connected to the inlet of the corresponding main metering pump (5). The outlet of the main metering pump (5) is connected to the main delivery pipe (501). A spray gun (6) is provided at the outlet of the main delivery pipe (501). The outlet of the main delivery pipe (501) is connected to the inlet of the spray gun (6). The outlet of the air compressor (7) is connected to the inlet of the spray gun (6) through the air delivery pipe (702). The outlet of the standby metering pump (4) is connected to the main delivery pipeline (501) through a pipeline assembly.

2. The ammonia water conveying system for flue gas denitrification according to claim 1, characterized in that: The pipeline assembly includes a backup main pipeline (401) and a backup branch pipeline (402). One end of the backup main pipeline (401) is connected to the outlet of the backup metering pump (4). Several backup branch pipelines (402) are provided. One end of the backup branch pipeline (402) is connected to the backup main pipeline (401), and the other end of the backup branch pipeline (402) is connected to the corresponding main pipeline (501).

3. The ammonia water conveying system for flue gas denitrification according to claim 2, characterized in that: A first valve (502) is installed on the main delivery pipeline (501), and a second valve (403) is installed on the backup delivery branch pipeline (402).

4. The ammonia water conveying system for flue gas denitrification according to claim 1, characterized in that: A first regulating valve (104) is installed on the ammonia water delivery branch pipe (103), and a second regulating valve (203) is installed on the demineralized water delivery branch pipe (202).

5. The ammonia water conveying system for flue gas denitrification according to claim 2, characterized in that: Both the backup main pipeline (401) and the main pipeline (501) are equipped with pulse damping buffers (8).

6. The ammonia water conveying system for flue gas denitrification according to claim 1, characterized in that: A first filter (101) is provided between the ammonia solution storage tank (1) and the ammonia water conveying main pipeline (102). The inlet of the first filter (101) is connected to the outlet of the ammonia solution storage tank (1), and the outlet of the first filter (101) is connected to the inlet of the ammonia water conveying main pipeline (102).

7. The ammonia water conveying system for flue gas denitrification according to claim 1, characterized in that: A rotor flow meter (503) is installed on the main conveying pipeline (501).

8. The ammonia water conveying system for flue gas denitrification according to claim 7, characterized in that: A solenoid valve (504) is installed on the main delivery pipeline (501), and the solenoid valve (504) is located between the rotor flow meter (503) and the spray gun (6).

9. The ammonia water conveying system for flue gas denitrification according to any one of claims 1-8, characterized in that: The air compressor (7) is provided with a second filter (701) at its outlet, and the outlet of the second filter (701) is connected to the inlet of the air supply pipe (702).

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