A device for reducing SCR ammonia slip injection

Abstract

This invention provides a spray device for reducing ammonia escape in SCR (Self-Resistant Catalytic Reduction) systems, relating to the field of SCR ammonia spraying devices. It includes a spraying unit comprising a gun body, a nozzle connected to one end of the gun body, a sealing plate fixedly connected to the surface of the gun body, a microcontroller disposed on one side of the top of the gun body, an inlet pipe connected to the other end of the gun body, and a solenoid valve disposed on the surface of the inlet pipe for controlling the ammonia flow rate. This invention uses a laser gas sensor to monitor the ammonia concentration in the reaction tower in real time. When the ammonia concentration is detected to be too high, the microcontroller will promptly control the solenoid valve to precisely adjust the ammonia spray rate based on the feedback data. Furthermore, a flow sensor monitors the ammonia flow rate in real time and feeds the data back to the microcontroller, facilitating timely adjustment of the ammonia spray rate to ensure sufficient reaction. By precisely controlling the ammonia spray rate, the utilization rate of ammonia is improved, thereby mitigating the pollution caused by ammonia escape to the external environment.

Description

Technical Field

[0001] This utility model belongs to the field of SCR ammonia injection devices, specifically a device for reducing SCR ammonia escape injection. Background Technology

[0002] SCR ammonia injection units are key industrial equipment used to reduce nitrogen oxide emissions in flue gas. By injecting ammonia water or ammonia gas into the flue gas, it causes a reduction reaction with NOx under the action of a catalyst, generating harmless nitrogen gas and water vapor, thereby effectively reducing the NOx concentration in the flue gas. It is widely used in coal-fired power plants, industrial boilers, chemical industries and other fields.

[0003] Existing SCR ammonia injection devices mostly use spray guns. In operation, the spray gun is first inserted into the inlet of the reaction tower. Then, ammonia water from an external ammonia water tank is directly transferred to the spray gun through a transmission pipe. The ammonia water is then sprayed evenly into the reaction tower in a mist form through the spray gun. This allows the ammonia water to undergo a reduction reaction with NOx in the flue gas on the catalyst layer. Finally, the nitrogen gas and water vapor generated by the reaction are discharged from the reaction tower along with the flue gas, thereby achieving NOx emission reduction.

[0004] However, in actual use, since ammonia water is directly injected into the reaction tower to react with the flue gas, it is difficult to accurately control the amount of ammonia water injected. This results in too much ammonia water mist in the reaction tower, which cannot fully react with the flue gas. Consequently, the unreacted ammonia water mist is emitted into the atmosphere with the flue gas, forming what is known as ammonia escape. This not only wastes ammonia resources but may also pollute the external environment.

[0005] In summary, this invention provides an injection device to reduce SCR ammonia escape, thereby solving the aforementioned problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A device for reducing SCR ammonia slip injection, comprising:

[0008] The spraying unit includes a gun body, a nozzle connected to one end of the gun body, a sealing plate fixedly connected to the surface of the gun body, a microcontroller disposed on one side of the top of the gun body, a liquid inlet pipe connected to the other end of the gun body, a solenoid valve disposed on the surface of the liquid inlet pipe for controlling the flow rate of ammonia water, a flow sensor disposed on the surface of the liquid inlet pipe for measuring the flow rate of ammonia water, an air inlet pipe connected to the bottom of the gun body, and a conveying assembly disposed at one end of the liquid inlet pipe and the air inlet pipe.

[0009] The detection assembly includes a support rod, a placement seat disposed at one end of the support rod, and a laser gas sensor disposed in the inner cavity of the placement seat for detecting ammonia concentration.

[0010] Furthermore, in this utility model, the conveying assembly includes a conveying pipe connected to one end of the liquid inlet pipe and the air inlet pipe, a connecting sleeve connected to the other end of the conveying pipe, and a stainless steel filter screen threaded into the inner cavity of the connecting sleeve.

[0011] Furthermore, in this invention, a sealing gasket is fixedly connected to the bottom of the connecting sleeve, and the end of the connecting sleeve away from the conveying pipe is connected to an external ammonia tank and an air compressor, respectively.

[0012] Furthermore, in this utility model, one end of the support rod is fixedly connected to the sealing plate, and one end of the placement seat is fixedly connected to a fixing sleeve. The end of the support rod away from the sealing plate extends into the inner cavity of the fixing sleeve and is threadedly connected to the inner cavity of the fixing sleeve.

[0013] Furthermore, in this invention, the surface of the laser gas sensor is provided with a threaded sleeve, which is located in the inner cavity of the placement seat and is threadedly connected to the inner cavity of the placement seat.

[0014] Furthermore, in this invention, the output terminals of both the flow sensor and the laser gas sensor are connected to the input terminal of the microcontroller via a wireless communication module, and the output terminal of the microcontroller is connected to the input terminal of the solenoid valve via the wireless communication module.

[0015] Beneficial effects: This utility model has the following beneficial effects:

[0016] This invention uses a laser gas sensor to monitor the concentration of ammonia in the reaction tower in real time. When the ammonia concentration is detected to be too high, the microcontroller will control the solenoid valve to precisely adjust the injection volume of ammonia water based on the feedback data. The flow sensor will also monitor the flow rate of ammonia water in real time and feed the data back to the microcontroller, so as to adjust the injection volume of ammonia water in a timely manner. This ensures that the ammonia water and flue gas can react fully on the catalyst layer. By precisely controlling the injection volume of ammonia water, the utilization rate of ammonia water is improved, thereby mitigating the pollution of the external environment caused by ammonia escape. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the conveying component of this utility model from a bottom view.

[0019] Figure 3 This is a schematic diagram of the structure of the support rod, the placement seat, and the laser gas sensor in their separated states according to this utility model;

[0020] Figure 4 This is a schematic diagram of the system principle of this utility model.

[0021] In the picture:

[0022] 100. Spraying unit; 110. Gun body; 120. Nozzle; 130. Sealing plate; 140. Microcontroller; 150. Liquid inlet pipe; 160. Solenoid valve; 170. Flow sensor; 180. Air inlet pipe; 200. Detection assembly; 210. Support rod; 220. Placement seat; 221. Fixing sleeve; 230. Laser gas sensor; 231. Threaded sleeve; 300. Conveying assembly; 310. Conveying pipe; 320. Connecting sleeve; 330. Stainless steel filter screen; 340. Sealing gasket. Detailed Implementation

[0023] To better understand the technical content of this utility model, specific embodiments are described below in conjunction with the accompanying drawings. Various aspects of this utility model are described in this disclosure with reference to the accompanying drawings, which illustrate numerous illustrative embodiments. The embodiments of this disclosure are not necessarily defined to include all aspects of this utility model. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in this utility model are not limited to any particular implementation. Furthermore, some aspects of this utility model can be used alone or in any suitable combination with other aspects disclosed in this utility model.

[0024] Example 1

[0025] like Figure 1-4 As shown, this is the first embodiment of the present invention, which provides an injection device for reducing SCR ammonia slip, including...

[0026] The spraying unit 100 includes a gun body 110, a nozzle 120 connected to one end of the gun body 110, a sealing plate 130 fixedly connected to the surface of the gun body 110, a microcontroller 140 disposed on one side of the top of the gun body 110, a liquid inlet pipe 150 connected to the other end of the gun body 110, a solenoid valve 160 disposed on the surface of the liquid inlet pipe 150 for controlling the flow rate of ammonia water, a flow sensor 170 disposed on the surface of the liquid inlet pipe 150 for measuring the flow rate of ammonia water, an air inlet pipe 180 connected to the bottom of the gun body 110, and a delivery assembly 300 disposed at one end of the liquid inlet pipe 150 and the air inlet pipe 180.

[0027] The detection assembly 200 includes a support rod 210, a placement seat 220 disposed at one end of the support rod 210, and a laser gas sensor 230 disposed in the inner cavity of the placement seat 220 for detecting ammonia concentration.

[0028] like Figure 1-4 As shown, ammonia and compressed gas can be delivered to the inner cavity of the gun body 110 via the delivery component 300. The ammonia then enters the nozzle 120 through the gun body 110 and is uniformly sprayed into the reaction tower in a mist form for reaction. The concentration of ammonia in the reaction tower can be monitored by the laser gas sensor 230. The laser gas sensor 230 feeds back the monitored ammonia concentration data to the microcontroller 140. Based on the feedback data, the microcontroller 140 promptly controls the solenoid valve 160 to precisely adjust the ammonia injection rate. The flow sensor 170 monitors the ammonia flow rate in real time and feeds the data back to the microcontroller 140, facilitating timely adjustment of the ammonia injection rate until the ammonia concentration drops to a safe range. Throughout the entire SCR reaction process, the ammonia injection rate is continuously monitored and adjusted to ensure that the ammonia and flue gas can fully react on the catalyst layer, while mitigating ammonia escape, thereby ensuring the sufficiency of the reaction.

[0029] Example 2

[0030] Reference Figure 1 and 2 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0031] In this embodiment, the conveying assembly 300 includes a conveying pipe 310 connected to one end of the liquid inlet pipe 150 and the air inlet pipe 180, a connecting sleeve 320 connected to the other end of the conveying pipe 310, and a stainless steel filter screen 330 threadedly connected to the inner cavity of the connecting sleeve 320.

[0032] A sealing gasket 340 is fixedly connected to the bottom of the connecting sleeve 320, and the end of the connecting sleeve 320 away from the delivery pipe 310 is connected to the external ammonia tank and the air compressor respectively.

[0033] like Figure 1 and 2 As shown, the end of the connecting sleeve 320 away from the delivery pipe 310 is connected to the external ammonia tank and the air compressor respectively, which facilitates the supply of compressed gas and ammonia. The sealing gasket 340 ensures the sealing of the connection and prevents leakage of ammonia or compressed gas. The delivery pipe 310 can transmit compressed gas and ammonia to the inside of the air inlet pipe 180 and the liquid inlet pipe 150 respectively. The stainless steel filter screen 330 is provided to filter impurities and particles in the ammonia or compressed air and prevent impurities and particles from clogging the nozzle 120.

[0034] Example 3

[0035] Reference Figure 1 , 3 4 and 5 are the third embodiment of this utility model, which is based on the first two embodiments.

[0036] In this embodiment, one end of the support rod 210 is fixedly connected to the sealing plate 130, and one end of the placement seat 220 is fixedly connected to the fixing sleeve 221. The end of the support rod 210 away from the sealing plate 130 extends into the inner cavity of the fixing sleeve 221 and is threadedly connected to the inner cavity of the fixing sleeve 221.

[0037] The surface of the laser gas sensor 230 is provided with a threaded sleeve 231, which is located in the inner cavity of the placement seat 220 and is threadedly connected to the inner cavity of the placement seat 220.

[0038] The outputs of both the flow sensor 170 and the laser gas sensor 230 are connected to the input of the microcontroller 140 via a wireless communication module. The output of the microcontroller 140 is connected to the input of the solenoid valve 160 via a wireless communication module. The laser gas sensor 230 is an AM5302PL model, the flow sensor 170 is an LDG series model, the microcontroller 140 is an ESP32 series microcontroller, and the solenoid valve 160 is an electric butterfly valve.

[0039] like Figure 1 , 3 As shown in Figure 4, the support rod 210 is connected to the sealing plate 130 to ensure the stability of the placement seat 220 and the laser gas sensor 230. The placement seat 220 provides a space for the laser gas sensor 230 and can shield and protect its surface. The laser gas sensor 230 is connected to the placement seat 220 by a threaded sleeve 231, which enables convenient installation and removal of the laser gas sensor 230. This facilitates subsequent maintenance, replacement or calibration, thereby ensuring the accuracy and stability of the measurement results. The output terminals of the flow sensor 170 and the laser gas sensor 230 are both connected to the input terminal of the microcontroller 140 through a wireless communication module. The microcontroller 140 can then adjust the opening of the solenoid valve 160 in real time based on the data fed back by the laser gas sensor 230 and the flow sensor 170, thereby accurately controlling the injection volume of ammonia water. The adoption of intelligent control improves the control accuracy and helps to reduce the occurrence of ammonia escape.

[0040] In use, the nozzle 120 and detection component 200 are first inserted into the inlet of the reaction tower to facilitate subsequent ammonia injection and detection of ammonia concentration inside the tower. The inlet is then sealed with a sealing plate 130 to prevent leakage of flue gas or ammonia mist. Next, it is connected to an external ammonia tank and air compressor via a connecting sleeve 320. Ammonia and compressed air are then transmitted through a delivery pipe 310 to the inner cavities of the liquid inlet pipe 150 and air inlet pipe 180. The liquid inlet pipe 150 and air inlet pipe 180 deliver the ammonia and compressed gas to the inner cavity of the gun body 110, allowing the ammonia to enter the nozzle 120 through the gun body 110 and be evenly sprayed into the reaction tower in a mist form for reaction. During the reaction, the laser gas sensor 230 can detect... The laser gas sensor 230 monitors the ammonia concentration in the reaction tower and feeds back the monitored ammonia concentration data to the microcontroller 140. The microcontroller 140 determines whether ammonia escape occurs based on a preset ammonia concentration threshold. If ammonia escape occurs, the microcontroller 140 reduces the ammonia injection volume by adjusting the opening of the solenoid valve 160. The flow sensor 170 monitors the ammonia flow rate in real time and feeds the data back to the microcontroller 140 to precisely control the ammonia injection volume until the ammonia concentration drops to a safe range. Throughout the SCR reaction process, the ammonia injection volume is continuously monitored and adjusted to ensure that the ammonia and flue gas can fully react on the catalyst layer, while mitigating ammonia escape and ensuring the sufficiency of the reaction.

[0041] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail in this application.

[0042] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A reduced-SCR ammonia slip injection device, characterized by: include The spraying unit (100) includes a gun body (110), a nozzle (120) connected to one end of the gun body (110), a sealing plate (130) fixedly connected to the surface of the gun body (110), a microcontroller (140) disposed on one side of the top of the gun body (110), a liquid inlet pipe (150) connected to the other end of the gun body (110), a solenoid valve (160) disposed on the surface of the liquid inlet pipe (150) and used to control the flow rate of ammonia water, a flow sensor (170) disposed on the surface of the liquid inlet pipe (150) and used to measure the flow rate of ammonia water, an air inlet pipe (180) connected to the bottom of the gun body (110), and a delivery assembly (300) disposed at one end of the liquid inlet pipe (150) and the air inlet pipe (180). The detection assembly (200) includes a support rod (210), a placement seat (220) disposed at one end of the support rod (210), and a laser gas sensor (230) disposed in the inner cavity of the placement seat (220) for detecting ammonia concentration.

2. The reduced-SCR ammonia slip injection device of claim 1, wherein: The delivery assembly (300) includes a delivery pipe (310) connected to one end of the liquid inlet pipe (150) and the air inlet pipe (180), a connecting sleeve (320) connected to the other end of the delivery pipe (310), and a stainless steel filter screen (330) threaded into the inner cavity of the connecting sleeve (320).

3. The reduced-SCR ammonia slip injection device of claim 2, wherein: A sealing gasket (340) is fixedly connected to the bottom of the connecting sleeve (320), and the end of the connecting sleeve (320) away from the delivery pipe (310) is connected to the external ammonia tank and the air compressor respectively.

4. The reduced-SCR ammonia slip injection device of claim 1, wherein: One end of the support rod (210) is fixedly connected to the sealing plate (130), and one end of the placement seat (220) is fixedly connected to the fixing sleeve (221). The end of the support rod (210) away from the sealing plate (130) extends into the inner cavity of the fixing sleeve (221) and is threadedly connected to the inner cavity of the fixing sleeve (221).

5. The reduced-SCR ammonia slip injection device of claim 1, wherein: The surface of the laser gas sensor (230) is provided with a threaded sleeve (231), which is located in the inner cavity of the placement seat (220) and is threadedly connected to the inner cavity of the placement seat (220).

6. The reduced-SCR ammonia slip injection device of claim 1, wherein: The output terminals of the flow sensor (170) and the laser gas sensor (230) are both connected to the input terminal of the microcontroller (140) via a wireless communication module. The output terminal of the microcontroller (140) is connected to the input terminal of the solenoid valve (160) via a wireless communication module.

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