An active carbon injection device and flue gas purification system

Abstract

The utility model belongs to flue gas purification equipment technical field discloses a kind of active carbon injection device and flue gas purification system.Active carbon injection device includes active carbon bin, conveying pipeline, screw conveyor and flow monitoring sensor.The utility model passes through the linkage of flow monitoring and frequency conversion regulation, so that active carbon flow can change in real time with working condition, when flue gas quantity increases or heavy metal, dioxin concentration rises in incineration process, can increase flow by increasing screw shaft rotating speed, ensure that enough active carbon is contacted with pollutant, avoid the risk of emission overproof caused by insufficient adsorbent;On the contrary, when flue gas quantity reduces or pollutant concentration is lower, can reduce flow, prevent material waste and filter bag accumulation problem caused by active carbon over-injection, guarantee equipment operating efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas purification equipment, and in particular to an activated carbon blowing device and a flue gas purification system. Background Technology

[0002] In fields such as waste incineration and industrial waste gas treatment, incineration flue gas usually contains trace amounts of harmful substances such as dioxins and heavy metals. Among them, heavy metal pollutants exist in gaseous form during incineration. As the flue gas temperature decreases, they will condense into particulate matter and be captured and removed. Heavy metal elements with lower melting points will form oxides or chlorides with higher melting points and easy condensation under the catalytic action on the fly ash surface. In particular, mercury and cadmium are mostly adsorbed on fly ash particles and captured.

[0003] To effectively remove these hazardous substances, existing technologies often employ activated carbon injection devices to inject activated carbon into dry reactors to adsorb dioxins and heavy metals in flue gas. Traditional activated carbon injection devices typically include an activated carbon silo, a feeding screw conveyor, a conveying pipeline, and a fan. The activated carbon is stored in the activated carbon silo, fed into the conveying pipeline via the feeding screw conveyor, and then transported to the dry reactor by the fan to be injected into the flue gas. After mixing with the airflow, the activated carbon is adsorbed on the surface of the filter bags in the baghouse dust collector and discharged with the dust removal process.

[0004] However, the activated carbon flow rate of existing activated carbon injection devices cannot be dynamically adjusted according to changes in combustion conditions (such as flue gas volume fluctuations and pollutant concentration differences). When the flue gas volume increases or the pollutant concentration rises, a small amount of activated carbon cannot meet the adsorption requirements, resulting in the emission of some hazardous substances without effective adsorption, causing the risk of exceeding environmental standards. When the flue gas volume decreases or the pollutant concentration is low, excessive activated carbon will be consumed unnecessarily, increasing material costs and potentially accumulating in the bag filter, affecting the operating efficiency of the dust removal equipment.

[0005] Therefore, the above problems urgently need to be solved. Utility Model Content

[0006] The purpose of this invention is to provide an activated carbon injection device and a flue gas purification system to achieve dynamic adjustment of activated carbon flow rate and ensure equipment operating efficiency.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] An activated carbon blowing device includes an activated carbon silo, a conveying pipeline, a feeding screw conveyor, and a flow monitoring sensor, wherein:

[0009] The activated carbon chamber is used to store activated carbon;

[0010] The activated carbon bin is connected to the dry reactor via the conveying pipeline to transport the activated carbon stored in the activated carbon bin to the dry reactor.

[0011] The feeding screw conveyor is located at the bottom of the activated carbon bin, and the feeding screw conveyor is used to supply the activated carbon stored in the activated carbon bin to the conveying pipe;

[0012] The flow monitoring sensor is installed on the conveying pipeline and located downstream of the feeding screw conveyor. The flow monitoring sensor is used to detect the flow rate of activated carbon in the conveying pipeline.

[0013] The feeding screw conveyor includes a screw shaft, a feeding sleeve, and a variable frequency motor. The feeding sleeve is located outside the screw shaft and connected to the conveying pipe. The variable frequency motor is driven by the screw shaft to drive the screw shaft to rotate. The variable frequency motor is configured to adjust the speed of the screw shaft according to the signal fed back by the flow monitoring sensor, thereby adjusting the flow rate of activated carbon.

[0014] Preferably, the conveying pipeline includes a pipeline body and a variable frequency fan installed on the pipeline body, and the air volume of the variable frequency fan is linked and matched with the flow rate of activated carbon output by the feeding screw conveyor, so as to stabilize the conveying air velocity of activated carbon in the conveying pipeline under different flow rates.

[0015] Preferably, the end of the pipe body is provided with an atomizing nozzle that extends into the dry reactor, and the atomizing nozzle is used to spray activated carbon in the opposite direction to the flue gas flow.

[0016] Preferably, the atomizing nozzle is provided with guide vanes to disperse the activated carbon into a particle stream of a preset particle size.

[0017] Preferably, the conveying pipeline further includes a pressure sensor and a flow regulating valve installed on the pipeline body. The pressure sensor is used to monitor the air pressure inside the pipeline body in real time. The variable frequency fan and the feeding screw conveyor are both electrically connected to the flow regulating valve. The flow regulating valve is configured to automatically adjust the air volume of the variable frequency fan and the flow rate of activated carbon output by the feeding screw conveyor when the air pressure is abnormal.

[0018] Preferably, the activated carbon blowing device further includes an alarm unit that is electrically connected to the pressure sensor, the alarm unit being configured to issue an alarm when the pressure sensor detects that the air pressure inside the pipe body exceeds a preset threshold.

[0019] Preferably, the activated carbon injection device further includes a real-time monitoring component and a central control processing unit, wherein:

[0020] The real-time monitoring component is configured to detect three parameters in the dry reactor in real time: flue gas volume, temperature, and pollutant concentration, and convert them into electrical signals to be fed back to the central control processing unit.

[0021] The central control processing unit generates a target flow rate based on the electrical signal fed back by the real-time monitoring component, and controls the feeding screw conveyor to supply activated carbon according to the target flow rate.

[0022] Preferably, a negative pressure fan is provided on the top of the activated carbon bin. The negative pressure fan is configured to start synchronously with the feeding screw conveyor during operation to maintain a negative pressure state inside the activated carbon bin, and the air outlet of the negative pressure fan is connected to the downstream section of the conveying pipeline.

[0023] Preferably, the activated carbon chamber is provided with a rapping component, which is configured to vibrate periodically to prevent the activated carbon from bridging or clumping within the activated carbon chamber.

[0024] A flue gas purification system includes a dry reactor, a bag filter, and the aforementioned activated carbon injection device, wherein:

[0025] The inlet of the dry reactor is connected to the exhaust gas source to supply flue gas to the dry reactor;

[0026] The activated carbon injection device is used to inject activated carbon into the dry reactor to adsorb pollutants in the flue gas.

[0027] The bag filter is installed inside the dry reactor and is used to filter the flue gas inside the dry reactor and discharge it from the dry reactor.

[0028] The beneficial effects of this utility model are:

[0029] This invention enables the activated carbon flow rate to change in real time according to the operating conditions through the linkage of flow monitoring and frequency conversion regulation. When the flue gas volume increases or the concentration of heavy metals and dioxins rises during the combustion process, the screw shaft speed can be increased to increase the flow rate, ensuring sufficient contact between activated carbon and pollutants and avoiding the risk of exceeding emission standards due to insufficient adsorbent. Conversely, when the flue gas volume decreases or the pollutant concentration is low, the flow rate can be reduced to prevent material waste and filter bag accumulation caused by excessive activated carbon injection, thus ensuring equipment operating efficiency. Attached Figure Description

[0030] Fig. 1 This is a schematic diagram of the activated carbon blowing device provided by this utility model;

[0031] Fig. 2 This is a schematic diagram of the structure of the activated carbon chamber provided by this utility model;

[0032] Fig. 3 This is a schematic diagram of the structure of the feeding screw conveyor provided by this utility model;

[0033] Fig. 4 This is a schematic diagram of the conveying pipeline provided by this utility model.

[0034] In the picture:

[0035] 100. Dry reactor;

[0036] 1. Activated carbon chamber; 11. Negative pressure fan; 12. Vibration assembly;

[0037] 2. Delivery pipeline; 21. Atomizing nozzle; 22. Pressure sensor;

[0038] 3. Feeding screw conveyor; 31. Screw shaft; 32. Feeding sleeve; 33. Variable frequency motor;

[0039] 4. Flow monitoring sensor; 5. Variable frequency fan. Detailed Implementation

[0040] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0041] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0042] In this application, the term "and / or" describes a relationship between related objects, indicating that three relationships can exist. For example, a centrifugal vortex magnetic pump and / or a centrifugal vortex magnetic pump can represent: the existence of only one centrifugal vortex magnetic pump, the simultaneous existence of one centrifugal vortex magnetic pump and a centrifugal vortex magnetic pump, or the existence of only one centrifugal vortex magnetic pump. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0043] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0044] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0045] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0046] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0047] Please see Figs. 1 to 4This embodiment provides an activated carbon injection device, which includes an activated carbon bin 1, a conveying pipe 2, a feeding screw conveyor 3, and a flow monitoring sensor 4. The activated carbon bin 1 is used to store activated carbon. The activated carbon bin 1 is connected to a dry reactor 100 via the conveying pipe 2 to transport the activated carbon stored in the bin 1 to the dry reactor 100. The feeding screw conveyor 3 is located at the bottom of the activated carbon bin 1 and is used to supply the activated carbon stored in the bin 1 to the conveying pipe 2. The flow monitoring sensor 4 is located on the conveying pipe 2 and downstream of the feeding screw conveyor 3, and is used to detect the flow rate of the activated carbon in the conveying pipe 2. The feeding screw conveyor 3 includes a screw shaft 31, a feeding sleeve 32, and a variable frequency motor 33. The feeding sleeve 32 is located outside the screw shaft 31 and is connected to the conveying pipe 2. The variable frequency motor 33 is connected to the screw shaft 31 to drive the screw shaft 31 to rotate. The variable frequency motor 33 is configured to adjust the speed of the screw shaft 31 according to the signal fed back by the flow monitoring sensor 4, thereby adjusting the flow rate of activated carbon.

[0048] With this setup, the feeding screw conveyor 3 pushes activated carbon to the conveying pipe 2 by rotating the screw shaft 31. The flow monitoring sensor 4 located downstream of the feeding screw conveyor 3 detects the flow rate of activated carbon per unit time in real time and feeds back the detection signal to the variable frequency motor 33. The variable frequency motor 33 adjusts the speed of the screw shaft 31 according to the feedback signal. When it is necessary to increase the flow rate of activated carbon, the speed is increased, and vice versa, the speed is decreased, thereby realizing the dynamic adjustment of the flow rate of activated carbon.

[0049] Understandably, by linking flow monitoring and frequency conversion regulation, the activated carbon flow rate can be changed in real time according to the operating conditions. When the flue gas volume increases or the concentration of heavy metals and dioxins rises during the combustion process, the speed of the spiral shaft 31 can be increased to increase the flow rate, ensuring sufficient contact between activated carbon and pollutants and avoiding the risk of exceeding emission standards due to insufficient adsorbent. Conversely, when the flue gas volume decreases or the pollutant concentration is low, the flow rate can be reduced to prevent material waste and filter bag accumulation caused by excessive activated carbon injection, thus ensuring equipment operating efficiency.

[0050] Generally, during pneumatic conveying of activated carbon, the conveying air velocity needs to be maintained above the critical suspension velocity, that is, it is necessary to ensure that the activated carbon particles are in a suspended state and conveyed smoothly. If the air velocity is too low, the activated carbon is prone to deposit in the pipeline, causing pipeline blockage; if the air velocity is too high, it will not only increase energy consumption, but also aggravate pipeline wear.

[0051] Therefore, in this embodiment, the conveying pipe 2 includes a pipe body and a variable frequency fan 5 installed on the pipe body, and the air volume of the variable frequency fan 5 is linked and matched with the flow rate of activated carbon output by the feeding screw conveyor 3, so as to stabilize the conveying air velocity of activated carbon in the conveying pipe 2 under different flow rates.

[0052] As can be seen from the above, when the feed screw conveyor 3 adjusts the flow rate according to the working conditions, the variable frequency fan 5 synchronously adjusts the air volume to keep the air speed constant, thereby ensuring the reliability of the conveying system under different working conditions and reducing maintenance costs. For example, when the flow rate increases, the variable frequency fan 5 automatically increases the air volume to maintain a stable air speed and prevent material accumulation due to insufficient air speed; when the flow rate decreases, the variable frequency fan 5 correspondingly reduces the air volume to avoid unnecessary energy waste.

[0053] Specifically, the end of the pipe body is equipped with an atomizing nozzle 21 extending into the dry reactor 100. The atomizing nozzle 21 is used to spray activated carbon in the opposite direction to the flue gas flow. It is understood that the counter-current injection creates a counter-current flow between the activated carbon and the high-speed flue gas. According to the turbulent diffusion effect in fluid mechanics, this generates strong vortices and disturbances, significantly improving the mixing uniformity of the gas and solid phases, thereby effectively increasing the capture probability of harmful substances such as dioxins and heavy metals. Furthermore, the counter-current arrangement significantly extends the residence path of the activated carbon in the flue gas, that is, it extends the actual movement distance of the particles within the reactor. According to the principles of mass transfer kinetics, the increased contact time directly promotes the adsorption process towards equilibrium, significantly enhancing the capture effect.

[0054] To further enhance the collection effect, a guide vane is provided inside the atomizing nozzle 21 to disperse the activated carbon into a particle stream of a preset particle size. It can be understood that the guide vane, through mechanical shearing and diversion, can break down agglomerated activated carbon into a particle stream of a preset particle size. The uniform particle size distribution significantly increases the effective adsorption sites per unit mass of activated carbon, resulting in a significant improvement in collection efficiency. More importantly, during pneumatic conveying, dry activated carbon particles are prone to static electricity due to friction, forming flocculent clumps with a particle size of hundreds of micrometers, leading to pipe blockage or nozzle scaling. The turbulence effect of the guide vane can break up the electrostatic agglomeration of activated carbon in real time. It should be noted that the specific structure of the guide vane can be designed according to the actual application scenario; this embodiment will not elaborate on this.

[0055] To improve the reliability of the system operation, the conveying pipeline 2 also includes a pressure sensor 22 and a flow regulating valve installed on the pipeline body. The pressure sensor 22 is used to monitor the air pressure inside the pipeline body in real time. The variable frequency fan 5 and the feeding screw conveyor 3 are both electrically connected to the flow regulating valve. The flow regulating valve is configured to automatically adjust the air volume of the variable frequency fan 5 and the flow rate of activated carbon output by the feeding screw conveyor 3 when the air pressure is abnormal. When the pipeline is partially blocked (such as when scale buildup on the atomizing nozzle 21 reduces the flow cross-sectional area), the pressure sensor 22 will detect a sudden increase in air pressure upstream of the blockage point. At this time, the flow regulating valve and the variable frequency fan 5 work together. On the one hand, the valve opening is increased to clear the airflow in the blocked section. On the other hand, the variable frequency fan 5 increases its speed to the maximum value of its rated air volume, using a pulsed strong airflow to break up the scale. It should be noted that the pressure sensor 22 can adopt a piezoresistive or capacitive structure, be installed on the inner wall of the pipeline, sense the change in air pressure through a Wheatstone bridge or capacitor plates, and output an electrical signal to the control system; the flow regulating valve can be an electric butterfly valve or a pneumatic diaphragm valve, equipped with an equal percentage characteristic valve core, connected to the pipeline body through a flange, and the valve stem is linked with the actuator to achieve precise adjustment of the opening degree and ensure rapid response in case of abnormal pressure.

[0056] Furthermore, the activated carbon injection device also includes an alarm unit electrically connected to the pressure sensor 22. The alarm unit is configured to issue an alarm when the pressure sensor 22 detects that the air pressure inside the pipeline exceeds a preset threshold. Specifically, the pressure sensor 22 monitors the air pressure inside the pipeline in real time. When the air pressure exceeds the preset threshold (e.g., +500Pa indicates blockage, -300Pa indicates leakage), the alarm unit immediately triggers an alarm, allowing operators to intervene in the early stages of system failure and preventing pipeline rupture caused by continuous accumulation of activated carbon. It should be noted that in this embodiment, the alarm unit preferably consists of a modular structure composed of a signal receiving module, a microcontroller, and an audible and visual alarm component. The signal receiving module is electrically connected to the pressure sensor 22 via a data acquisition card to acquire air pressure signals in real time. The microcontroller has a built-in preset pressure threshold and compares and processes the received signals. The audible and visual alarm component includes a high-brightness indicator light and a buzzer, and can integrate a wireless communication module to synchronously upload the alarm signal to the central control system, achieving dual local and remote early warning.

[0057] Furthermore, the activated carbon injection device also includes a real-time monitoring component and a central control processing unit. The real-time monitoring component is configured to detect three parameters in real time within the dry reactor 100: flue gas volume, temperature, and pollutant concentration, and convert them into electrical signals that are fed back to the central control processing unit. The central control processing unit generates a target flow rate based on the electrical signals fed back from the real-time monitoring component and controls the feeding screw conveyor 3 to supply activated carbon according to the target flow rate. This enables dynamic and precise addition of activated carbon, solving the problem of insufficient or excessive addition and waste caused by a fixed flow rate, and achieving continuous process optimization through data-driven approaches. It should be noted that the real-time monitoring component can adopt a modular sensor structure, including a thermal gas mass flow meter (measuring flue gas volume), a K-type thermocouple (measuring temperature), and an ultraviolet differential absorption spectrometer (measuring pollutant concentration). The detection signal is transmitted to the central control processing unit via a 4-20mA signal cable or RS485 bus. The central control processing unit adopts an industrial-grade PLC or DCS system, integrating a data acquisition module, PID control algorithm, and human-machine interface. It receives sensor signals via Modbus / TCP protocol, generates control commands through logic operations, and drives the feed screw conveyor's 3 frequency converters to achieve target flow control.

[0058] To improve the working environment, a negative pressure fan 11 is installed at the top of the activated carbon bin 1. The negative pressure fan 11 is configured to start synchronously with the feeding screw conveyor 3 during operation, maintaining a negative pressure state inside the activated carbon bin 1. The outlet of the negative pressure fan 11 is connected to the downstream section of the conveying pipe 2. With this configuration, the activated carbon dust generated by the rotation of the feeding screw conveyor 3 is adsorbed by the negative pressure inside the activated carbon bin 1, preventing dust from overflowing from gaps such as the feed inlet and inspection port. In addition, the outlet is connected to the downstream section of the conveying pipe 2, utilizing the negative pressure of the pipe to enhance the exhaust power, allowing the dust to be transported through the pipe to the dry reactor 100 for further adsorption, reducing the load on the workshop dust removal equipment.

[0059] To ensure continuous material feeding, a rapping assembly 12 is installed on the activated carbon bin 1. The rapping assembly 12 is configured to vibrate periodically to prevent activated carbon from bridging or clumping within the activated carbon bin 1. It should be noted that the rapping assembly 12 can adopt an electromagnetic pulse structure, consisting of a controller, a rapper, and sensors. The controller achieves periodic timing control through PLC programming; the rapper uses an industrial-grade electromagnetic hammer, vertically installed in the lower part of the bin; pressure sensors 22 are installed on the bin wall to monitor the vibration effect in real time, forming a closed-loop feedback.

[0060] This embodiment also provides a flue gas purification system, which includes a dry reactor 100, a bag filter, and the aforementioned activated carbon blowing device. The inlet of the dry reactor 100 is connected to a waste gas source to supply flue gas to the dry reactor 100. The activated carbon blowing device is used to blow activated carbon into the dry reactor 100 to adsorb pollutants in the flue gas. The bag filter is installed inside the dry reactor 100 and is used to filter the flue gas inside the dry reactor 100 and discharge it from the dry reactor 100. It is understood that the flue gas purification system including the aforementioned activated carbon blowing device has high operating efficiency.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An activated carbon injection device, characterized in that, The system includes an activated carbon bin (1), a conveying pipeline (2), a feeding screw conveyor (3), and a flow monitoring sensor (4), wherein: The activated carbon chamber (1) is used to store activated carbon; The activated carbon bin (1) is connected to the dry reactor (100) through the conveying pipe (2) to convey the activated carbon stored in the activated carbon bin (1) to the dry reactor (100). The feeding screw conveyor (3) is located at the bottom of the activated carbon bin (1) and is used to supply the activated carbon stored in the activated carbon bin (1) to the conveying pipe (2). The flow monitoring sensor (4) is installed on the conveying pipe (2) and located downstream of the feeding screw conveyor (3). The flow monitoring sensor (4) is used to detect the flow rate of activated carbon in the conveying pipe (2). The feeding screw conveyor (3) includes a screw shaft (31), a feeding sleeve (32), and a variable frequency motor (33). The feeding sleeve (32) is located outside the screw shaft (31) and connected to the conveying pipe (2). The variable frequency motor (33) is connected to the screw shaft (31) to drive the screw shaft (31) to rotate. The variable frequency motor (33) is configured to adjust the rotation speed of the screw shaft (31) according to the signal fed back by the flow monitoring sensor (4), thereby adjusting the flow rate of activated carbon.

2. The activated carbon injection device according to claim 1, characterized in that, The conveying pipeline (2) includes a pipeline body and a variable frequency fan (5) installed on the pipeline body. The air volume of the variable frequency fan (5) is linked and matched with the flow rate of activated carbon output by the feeding screw conveyor (3) so that the conveying speed of activated carbon in the conveying pipeline (2) is stable under different flow rates.

3. The activated carbon injection device according to claim 2, characterized in that, The end of the pipe body is provided with an atomizing nozzle (21) that extends into the dry reactor (100), and the atomizing nozzle (21) is used to spray activated carbon in the opposite direction to the flue gas flow direction.

4. The activated carbon injection device according to claim 3, characterized in that, The atomizing nozzle (21) is provided with guide vanes to disperse the activated carbon into a particle flow of a preset particle size.

5. The activated carbon injection device according to claim 2, characterized in that, The conveying pipeline (2) also includes a pressure sensor (22) and a flow regulating valve installed on the pipeline body. The pressure sensor (22) is used to monitor the air pressure inside the pipeline body in real time. The variable frequency fan (5) and the feeding screw conveyor (3) are electrically connected to the flow regulating valve. The flow regulating valve is configured to automatically adjust the air volume of the variable frequency fan (5) and the flow rate of activated carbon output by the feeding screw conveyor (3) when the air pressure is abnormal.

6. The activated carbon injection device according to claim 5, characterized in that, The activated carbon blowing device also includes an alarm unit that is electrically connected to the pressure sensor (22), the alarm unit being configured to issue an alarm when the pressure sensor (22) detects that the air pressure in the pipe body exceeds a preset threshold.

7. The activated carbon injection device according to claim 1, characterized in that, The activated carbon injection device also includes a real-time monitoring component and a central control processing unit, wherein: The real-time monitoring component is configured to detect three parameters in real time: flue gas volume, temperature, and pollutant concentration in the dry reactor (100) and convert them into electrical signals to be fed back to the central control processing unit. The central control processing unit generates a target flow rate through the electrical signal fed back by the real-time monitoring component, and controls the feeding screw conveyor (3) to supply activated carbon according to the target flow rate.

8. The activated carbon injection device according to claim 1, characterized in that, A negative pressure fan (11) is provided on the top of the activated carbon chamber (1). The negative pressure fan (11) is configured to start synchronously when the feeding screw conveyor (3) is running, so that the activated carbon chamber (1) is kept under negative pressure. The air outlet of the negative pressure fan (11) is connected to the downstream section of the conveying pipe (2).

9. The activated carbon injection device according to claim 1, characterized in that, The activated carbon chamber (1) is provided with a rapping component (12), which is configured to vibrate periodically to prevent the activated carbon from bridging or clumping in the activated carbon chamber (1).

10. A flue gas purification system, characterized in that, Includes a dry reactor (100), a bag filter, and an activated carbon injection device as described in any one of claims 1-8, wherein: The air inlet of the dry reactor (100) is connected to the exhaust gas source to supply flue gas to the dry reactor (100); The activated carbon blowing device is used to blow activated carbon into the dry reactor (100) to adsorb pollutants in the flue gas through the activated carbon; The bag filter is installed inside the dry reactor (100) and is used to filter the flue gas inside the dry reactor (100) and discharge it from the dry reactor (100).

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