Flue gas dry treatment device

Abstract

The utility model discloses a flue gas dry-method treatment device which comprises a centrifugal fan communicated with a flue gas reaction tower through a pipeline; an outlet of the baking soda bin is provided with a first spiral conveyor, and the first spiral conveyor is communicated to a pipeline on the air inlet side of the centrifugal fan; an outlet of the activated carbon bin is provided with a second screw conveyor, and the second screw conveyor is communicated to a pipeline between the air outlet side of the centrifugal fan and the flue gas reaction tower; a discharging articulated chute is arranged between the first spiral conveyor and the air inlet side of the centrifugal fan, and baking soda is conveyed into the centrifugal fan through the discharging articulated chute; an air inlet valve is further arranged on the air inlet side of the centrifugal fan and used for adjusting the amount of air entering the centrifugal fan. Baking soda and activated carbon are conveyed into the flue gas reaction tower through the centrifugal fan for flue gas treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, and in particular to a flue gas dry treatment device. Background Art

[0002] Dry flue gas treatment technology is an important part of the flue gas purification process, mainly involving dry deacidification, activated carbon adsorption and dust removal technology. Dry deacidification is to add deacidification agents such as baking soda or slaked lime powder of a certain particle size into the flue or reactor to react chemically with acidic gases such as sulfur dioxide in the flue gas. Dry deacidification does not produce salt-containing wastewater, and the equipment has a very high utilization rate. Activated carbon adsorption is to add activated carbon powder of a certain particle size into the flue or reactor to adsorb heavy metals and dioxins in the flue gas. The amount of activated carbon added is closely related to the flue gas composition, and the equipment utilization rate is relatively low.

[0003] In the current flue gas dry treatment process, the dry deacidification device and the activated carbon adsorption device are often set up independently, which has the following disadvantages:

[0004] (1) Equipment waste. Separately setting up a deacidification agent conveying fan, an activated carbon conveying fan and their supporting conveying pipelines increases investment costs and reduces equipment utilization.

[0005] (2) Energy waste. The power consumption of two independent conveying fans is higher than that of a single conveying fan, and the frequent start and stop of the activated carbon conveying fan, which is not often used, further causes energy waste.

[0006] (3) Excessive cold air is introduced into the flue gas system. Utility Model Content

[0007] In order to solve the above-mentioned shortcomings of independently arranging a dry deacidification device and an activated carbon adsorption device, the purpose of the utility model is to provide a flue gas dry treatment device.

[0008] The utility model provides a flue gas dry treatment device, the device comprising:

[0009] A centrifugal fan connected to the flue gas reaction tower through a pipeline;

[0010] A baking soda silo, the outlet of which is provided with a first screw conveyor, the first screw conveyor being connected to a pipeline on the air inlet side of the centrifugal fan;

[0011] An activated carbon bin, the outlet of which is provided with a second screw conveyor, the second screw conveyor being connected to a pipeline between the air outlet side of the centrifugal fan and the flue gas reaction tower;

[0012] A discharge chute is provided between the first screw conveyor and the air inlet side of the centrifugal fan, and the baking soda is transported to the centrifugal fan through the discharge chute;

[0013] An air inlet valve is provided on the air inlet side of the centrifugal fan to adjust the amount of air entering the centrifugal fan;

[0014] The baking soda and activated carbon are transported to the flue gas reaction tower by the centrifugal fan for flue gas treatment;

[0015] A first pressure detection device is arranged at the outlet of the baking soda silo, and a second pressure detection device is arranged at the outlet of the second screw conveyor.

[0016] As a further improvement of the utility model, a material emitter is provided between the second screw conveyor and the air outlet side of the centrifugal fan;

[0017] The material launcher includes a first inlet, a second inlet and an outlet;

[0018] The first inlet is communicated with the centrifugal fan, the second inlet is communicated with the second screw conveyor, and the outlet is communicated with the flue gas reaction tower;

[0019] A third pressure detection device is arranged at the outlet of the material emitter.

[0020] As a further improvement of the present invention, an air-locking discharger is provided between the second inlet and the second screw conveyor.

[0021] As a further improvement of the utility model, a venturi tube is provided between the outlet and the flue gas reaction tower;

[0022] The outlet is communicated with the throat of the Venturi, and the flue gas to be treated enters the flue gas reaction tower through the Venturi tube.

[0023] As a further improvement of the utility model, the device also includes a bag dust collector, which is connected to the flue gas reaction tower, and the lower end of the bag dust collector is provided with an ash outlet.

[0024] As a further improvement of the present invention, both the first screw conveyor and the second screw conveyor are driven by variable frequency motors.

[0025] The beneficial effects of the utility model are as follows: by setting up a centrifugal fan, the material distribution and transportation of baking soda and activated carbon are completed at the same time, the deacidification and adsorption treatment of the flue gas are completed, the equipment investment is saved, and the floor space of the flue gas treatment device is reduced; at the same time, the use of multiple fans to introduce excessive cold air during the flue gas purification process is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0027] Figure 1 This is a schematic structural diagram of a flue gas dry treatment device according to an embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of the processing flow of a flue gas dry treatment device described in an embodiment of the utility model.

[0029] In the figure,

[0030] 1. Baking soda silo; 2. First screw conveyor; 3. Discharge chute; 4. Centrifugal fan; 5. Activated carbon silo; 6. Second screw conveyor; 7. Air-locking discharger; 8. Air inlet valve; 9. Material launcher; 10. Pipeline; 11. Venturi tube; 12. Flue gas reaction tower; 13. Bag filter; 14. First pressure detection device; 15. Second pressure detection device; 16. Third pressure detection device. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, in the description of the present utility model, the terms used are only for illustrative purposes and are not intended to limit the scope of the present utility model. The terms "include" and / or "comprise" are used to specify the existence of the elements, steps, operations and / or components, but do not exclude the existence or addition of one or more other elements, steps, operations and / or components. The terms "first", "second" and the like may be used to describe various elements, do not represent the order, and do not limit these elements. In addition, in the description of the present utility model, unless otherwise specified, the meaning of "multiple" is two and more than two. These terms are only used to distinguish one element from another element. In conjunction with the following drawings, these and / or other aspects become apparent, and it is easier for a person of ordinary skill in the art to understand the description of the embodiments described in the present utility model. The accompanying drawings are used to depict the embodiments described in the present utility model for illustrative purposes only. Those skilled in the art will easily recognize from the following description that, without departing from the principles described in the present utility model, alternative embodiments of the structures and methods shown in the present utility model can be adopted.

[0034] In the relevant literature, the dry deacidification and activated carbon adsorption technologies in the flue gas treatment process have certain similarities: first, the reagents used in both are fine powders, and the addition is achieved by a dilute phase pneumatic conveying fan; second, the reagent addition points are in the flue or reactor at the front end of the bag filter; third, the chemical reaction and material adsorption rate must be enhanced on the surface of the rear filter bag; finally, the reacted reagents are collected and discharged by the downstream bag filter. In view of the above similarities between the dry deacidification process and the activated carbon adsorption process, the present application provides a flue gas dry treatment device to overcome the problems existing in the prior art.

[0035] The embodiment of the utility model discloses a dry flue gas treatment device, the device comprising:

[0036] A centrifugal fan 4 is connected to a flue gas reaction tower 12 via a pipeline 10;

[0037] A baking soda silo 1, the outlet of which is provided with a first screw conveyor 2, the first screw conveyor 2 being connected to a pipeline on the air inlet side of the centrifugal fan 4;

[0038] An activated carbon bin 5, the outlet of which is provided with a second screw conveyor 6, the second screw conveyor 6 is connected to the pipeline between the air outlet side of the centrifugal fan 4 and the flue gas reaction tower 12;

[0039] A discharge chute 3 is provided between the first screw conveyor 2 and the air inlet side of the centrifugal fan 4, and the baking soda is transported to the centrifugal fan 4 through the discharge chute 3;

[0040] The air inlet side of the centrifugal fan is also provided with an air inlet valve 8 for adjusting the amount of air entering the centrifugal fan 4;

[0041] The baking soda and activated carbon are transported to the flue gas reaction tower 12 by the centrifugal fan 4 for flue gas treatment;

[0042] A first pressure detection device 14 is provided at the outlet of the baking soda silo, a second pressure detection device 15 is provided at the outlet of the second screw conveyor, and a third pressure detection device 16 is provided at the outlet of the material launcher.

[0043] For example, Figure 1 As shown, the baking soda silo 1 is located on the air inlet side of the centrifugal fan 4, and the activated carbon silo 5 is located on the air outlet side of the centrifugal fan 4. When the centrifugal fan 4 is in operation, the pipe 10 on its air inlet side is in a negative pressure state, and the pipe 10 on its air outlet side is in a positive pressure state, and then the baking soda powder is transported to the flue gas reaction tower 12 through the suction effect of the centrifugal fan 4 for the flue gas dry deacidification process, and reacts with acidic gases such as sulfur dioxide and hydrogen sulfide contained in the flue gas; the activated carbon powder is transported to the flue gas reaction tower 12 through the blowing effect of the centrifugal fan 4 for flue gas activated carbon adsorption, absorbing harmful heavy metals such as mercury and cadmium contained in the flue gas. In the dry deacidification process and activated carbon adsorption treatment process, only one centrifugal fan 4 is needed to complete the transportation of baking soda and activated carbon, saving equipment investment in the flue gas dry treatment process, thereby reducing equipment floor space and treatment costs. During the processing, the discharging of the baking soda silo 1 is completed by the first screw conveyor 2, and the discharging of the activated carbon silo 5 is completed by the second screw conveyor 6.

[0044] The inlet of the discharge chute 3 is connected to the outlet of the first screw conveyor 2, and the outlet of the discharge chute 3 is connected to the pipe 10 on the air inlet side of the centrifugal fan 4. The baking soda powder in the baking soda silo 1 is transported to the discharge chute 3 through the first screw conveyor 2, enters the pipe 10 through the discharge chute 3, and then is transported to the flue gas reaction tower 12 to react with the flue gas under the action of the centrifugal fan 4. The sealing performance of the baking soda powder during transportation is improved by the discharge chute 3, and the risk of baking soda powder spilling is effectively reduced.

[0045] The inlet of the air inlet valve 8 is connected to the atmosphere, and the outlet of the air inlet valve 8 is connected to the material outlet of the discharge chute 3 and the air inlet end of the centrifugal fan, respectively. By adjusting the opening of the air inlet valve 8 to control the amount of air entering the pipeline 10, the pipeline 10 on the air inlet and air outlet sides of the centrifugal fan 4 maintains the corresponding negative pressure value and positive pressure value, and then adjusts the pressure value during the transportation of baking soda powder and activated carbon powder to ensure the smooth transportation of baking soda powder and activated carbon powder. For example, when the opening of the air inlet valve 8 is adjusted to 50%, the pressure value of the baking soda powder unloading process is -460Pa, and the pressure value of the activated carbon powder unloading process is 30Pa; or when the opening of the air inlet valve 8 is adjusted to 80%, the pressure value of the baking soda powder unloading process is -190Pa, and the pressure value of the activated carbon powder unloading process is 30-32Pa. It should be noted that the pressure measuring point of the baking soda powder unloading process is the outlet of the baking soda silo 1, and the pressure measuring point of the activated carbon powder unloading process is the outlet of the second screw conveyor 6. During use, the required amount of baking soda powder and activated carbon powder can be determined according to the specific components of the flue gas to be treated, and then the pressure value during the transportation of baking soda powder and activated carbon powder can be adjusted by adjusting the opening of the air inlet valve 8.

[0046] A first pressure detection device 14 is provided at the outlet of the baking soda silo 1, for example, the first pressure detection device 14 is located at the outlet of the baking soda silo 1 above the first screw conveyor 2; a second pressure detection device 15 is provided at the outlet of the second screw conveyor 6, for example, the second pressure detection device 15 is provided between the second screw conveyor 6 and the air-locking discharger 7; a third pressure detection device 16 is provided at the outlet of the material launcher 9, for example, the third pressure detection device 16 is provided between the outlet of the material launcher 9 and the throat of the venturi. The discharge pressure value of baking soda is detected by the first pressure detection device 14, the discharge pressure value of activated carbon is detected by the second pressure detection device 15, and the conveying pressure values ​​of baking soda and activated carbon are detected by the third pressure detection device 16.

[0047] In an optional embodiment, a material emitter 9 is provided between the second screw conveyor 6 and the air outlet side of the centrifugal fan 4; the material emitter 9 includes a first inlet, a second inlet and an outlet; the first inlet is connected to the centrifugal fan 4, the second inlet is connected to the second screw conveyor 6, and the outlet is connected to the flue gas reaction tower 12. The mixture of baking soda powder and air in the upstream direction enters the material emitter 9 through the first inlet, and the activated carbon powder passing through the second screw conveyor 6 enters the material emitter 9 through the second inlet. After the acceleration of the material emitter 9, the mixture of baking soda powder, activated carbon powder and air is ejected from the outlet and finally enters the flue gas reaction tower 12 for flue gas treatment. The material emitter 9 adopts an existing material emitter, and the present application does not specifically limit its structure.

[0048] Preferably, an air-locking discharger 7 is provided between the second inlet of the material launcher 9 and the second screw conveyor 6. The inlet of the air-locking discharger 7 is connected to the second screw conveyor 6, and the outlet of the air-locking discharger 7 is connected to the second inlet of the material launcher 9. The air-locking discharger 7 can effectively prevent the reverse flow of the airflow inside the material launcher 9 while unloading, and avoid the reverse flow of activated carbon powder or baking soda powder, thereby ensuring smooth unloading of activated carbon powder. When the content of heavy metals and dioxins in the flue gas to be treated is low, the second screw conveyor 6 and the air-locking discharger 7 can be closed to stop the transportation and addition of activated carbon powder. When the process requires, the air-locking discharger 7 and the second screw conveyor 6 are opened and closed in turn to resume the transportation of activated carbon powder. The air-locked discharger 7 operates at a working frequency and its conveying capacity is always greater than that of the second screw conveyor 6, ensuring that there is no material accumulation between the second screw conveyor 6 and the air-locked discharger 7. The activated carbon powder at the outlet of the air-locked discharger 7 falls freely into the second inlet of the material emitter 9, and is transported to the downstream pipeline under the action of the mixture of the first inlet wind of the material emitter 9 and the baking soda powder, and finally enters the venturi tube 11 and the flue gas reaction tower 12 in sequence.

[0049] In an optional embodiment, a venturi tube 11 is provided between the outlet of the material launcher 9 and the flue gas reaction tower 12; the outlet of the material launcher 9 is connected to the throat of the venturi, and the flue gas to be treated enters the flue gas reaction tower 12 through the venturi tube 11. The flue gas flow direction in the venturi tube 11 and the flue gas reaction tower 12 is from bottom to top, and the baking soda powder and the activated carbon powder are accelerated after entering the venturi tube 11 and are fully mixed with the flue gas. The flue gas reaction tower 12 provides sufficient time for mixing, reaction and adsorption between the baking soda powder and the activated carbon powder and the flue gas, so that the acidic gas and heavy metal substances in the flue gas are fully treated.

[0050] In an optional embodiment, the device further includes a bag filter 13, which is connected to the flue gas reaction tower 12, and an ash outlet is provided at the lower end of the bag filter 13. For example, the inlet of the bag filter 13 is connected to the flue gas outlet provided at the upper part of the flue gas reaction tower 12, and the treated flue gas enters the bag filter 13 and is enriched on the inner surface of the bag filter 13. Since the filtration wind speed in the bag filter 13 is much lower than the flue gas flow rate in the flue and the flue gas reaction tower 12, the excess baking soda powder and activated carbon powder in the bag filter 13 will greatly improve the removal rate of pollutants in the flue gas. The dust, materials and purification products on the inner surface of the bag filter 13 will be discharged from the ash outlet provided at the bottom along with the cleaning operation of the bag filter 13.

[0051] In an optional embodiment, the first screw conveyor 2 and the second screw conveyor 6 are both driven by a variable frequency motor. The baking soda powder in the baking soda silo 1 is continuously fed to the first screw conveyor 2 under the action of gravity. The first screw conveyor 2 is driven by a variable frequency motor, and its operating frequency is positively correlated with the baking soda powder conveying amount. When the frequency of the variable frequency motor increases, the baking soda powder conveying amount increases. When the frequency of the variable frequency motor decreases, the baking soda powder conveying amount decreases. Similarly, the second screw conveyor 6 is driven by a variable frequency motor, and its operating frequency is positively correlated with the activated carbon powder conveying amount. When the frequency of the variable frequency motor increases, the activated carbon powder conveying amount increases. When the frequency of the variable frequency motor decreases, the activated carbon powder conveying amount decreases. In the flue gas treatment process, the frequency of the drive motor can be adjusted according to the specific components of the flue gas to be treated to control the discharge amount of baking soda powder and activated carbon powder.

[0052] like Figure 2 As shown, the processing flow of a flue gas dry treatment device described in the utility model is:

[0053] The flue gas to be treated enters the flue gas reaction tower 12 through the venturi tube 11, and the air inlet valve 8 is opened to 100% of its opening, the centrifugal fan 4, and the first screw conveyor 2 in sequence; the opening of the air inlet valve 8 is gradually reduced until the air intake matches the conveying amount of the first screw conveyor 2, so that the ratio of the amount of baking soda powder to the flue gas to be treated reaches the required range, and the baking soda powder in the baking soda silo 1 is sequentially conveyed to the flue gas reaction tower 12 through the first screw conveyor 2, the discharge chute 3, the centrifugal fan 4 and the material emitter 9, and chemically reacts with the acidic gas components in the flue gas to generate a solid powder product;

[0054] If the flue gas to be treated contains harmful heavy metals such as mercury and cadmium, then on the basis of completing the above process, the air-locking discharger 7 and the second screw conveyor 6 are opened in sequence, and the activated carbon powder in the activated carbon bin 5 is mixed with the airflow on the outlet side of the centrifugal fan 4 through the second screw conveyor 6, the air-locking discharger 7 and the material emitter 9 in turn and obtains the conveying power, and the activated carbon powder enters the flue gas reaction tower 12 and undergoes physical adsorption with the heavy metal components in the flue gas, and the harmful components are fixed inside the activated carbon powder;

[0055] Excessive baking soda powder and activated carbon powder enter the bag filter 13 with the flue gas flow and are filtered and collected. The baking soda powder and activated carbon powder attached to the inner surface of the bag filter 13 further purify the acidic gas and heavy metal components in the flue gas, thereby improving the flue gas purification efficiency. Finally, the purified flue gas is discharged from the outlet of the bag filter 13, and the dust, materials and purification products attached to the inner surface of the bag filter 13 will be discharged from the ash outlet along with the cleaning operation of the bag filter 13.

[0056] like Figure 1 and 2As shown, a flue gas dry treatment device and its treatment process described in the utility model are further described by taking a flue gas treatment as an example:

[0057] The effective volume of baking soda silo 1 is 15m 3 The effective volume of activated carbon bin 5 is 10m 3 The shapes of both are set as a cylindrical section at the top and a conical section at the bottom, and both are equipped with accessories such as vibration motors and level meters.

[0058] The bottom end of the conical section of the baking soda silo 1 is provided with a discharge port, which is connected to the feed port of the first screw conveyor 2. The first screw conveyor 2 adopts a variable frequency double-axis screw, and its conveying capacity is continuously adjustable from 30 to 120 kg / h. A proximity switch is arranged inside the first screw conveyor 2 to detect whether the screw conveyor is idling. When it is detected that the first screw conveyor 2 is idling, the vibration motor of the baking soda silo 1 is turned on to assist in unloading. The discharge port of the first screw conveyor 2 is connected to the pipeline 10 on the inlet side of the centrifugal fan 4 through the discharge chute 3. The discharge port of the first screw conveyor 2, the inlet and outlet of the discharge chute 3 are arranged in the same vertical direction, and the discharge chute 3 is made of a stainless steel 304 pipe with a smooth inner wall.

[0059] A discharge port is provided at the bottom end of the conical section of the activated carbon bin 5, and the discharge port is connected to the feed port of the second screw conveyor 6. The second screw conveyor 6 adopts a variable frequency double-axis screw, and its conveying capacity is continuously adjustable from 2 to 10 kg / h. A proximity switch is arranged inside the second screw conveyor 6 to detect whether the screw conveyor is idling. When it is detected that the second screw conveyor 6 is idling, the vibration motor of the activated carbon bin 5 is turned on to assist in unloading. The discharge port of the second screw conveyor 6 is connected to the inlet of the air-locking discharger 7, and the outlet of the air-locking discharger 7 is connected to the second inlet of the material launcher 9. The gap between the internal rotor and the outer shell of the air-locking discharger 7 is ≤3 mm to ensure a good sealing effect.

[0060] The centrifugal fan 4 adopts a variable frequency fan, and its frequency is continuously adjustable within 20 to 50 Hz. The pipe 10 on the air inlet side of the centrifugal fan 4 is also connected to the air inlet valve 8, and the air inlet valve 8 adopts an electric regulating valve, and its opening is adjustable from 0 to 100%. The air outlet side of the centrifugal fan 4 is connected to the first inlet of the material launcher 9 through the pipe 10, and the outlet of the material launcher 9 is connected to the venturi tube 11 through the pipe 10. The pipe 10 adopts a stainless steel 304 seamless steel pipe.

[0061] During operation, the centrifugal fan 4 is turned on, and the operating frequency of the centrifugal fan 4 is interlocked with the pressure value of the third pressure detection device 16, so that the pressure value of the pressure detection third pressure detection device 16 is within the reasonable design wind pressure range, ensuring that the wind pressure can transport all the baking soda powder and activated carbon powder into the venturi tube 11. The air inlet valve 8 is interlocked with the pressure value of the first pressure monitoring device 14, so that its negative pressure value is within the range of -500 to -200Pa. At the same time, observe the pressure value of the second pressure monitoring device 15, its positive pressure value should be controlled within 50Pa and the fluctuation should be within a reasonable range. If the pressure value and its fluctuation exceed the standard, stop the machine for inspection.

[0062] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0063] In addition, it will be understood by those skilled in the art that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0064] It will be appreciated by those skilled in the art that, although the present invention has been described with reference to exemplary embodiments, various changes may be made and its elements may be replaced with equivalents without departing from the scope of the present invention. In addition, many modifications may be made to adapt specific circumstances or materials to the teachings of the present invention without departing from the essential scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but the present invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A flue gas dry treatment device, characterized in that: The device comprises: A centrifugal fan connected to the flue gas reaction tower through a pipeline; A baking soda silo, the outlet of which is provided with a first screw conveyor, the first screw conveyor being connected to a pipeline on the air inlet side of the centrifugal fan; An activated carbon bin, the outlet of which is provided with a second screw conveyor, the second screw conveyor being connected to a pipeline between the air outlet side of the centrifugal fan and the flue gas reaction tower; A discharge chute is provided between the first screw conveyor and the air inlet side of the centrifugal fan, and the baking soda is transported to the centrifugal fan through the discharge chute; An air inlet valve is also provided on the air inlet side of the centrifugal fan to adjust the amount of air entering the centrifugal fan; The baking soda and activated carbon are transported to the flue gas reaction tower by the centrifugal fan for flue gas treatment; A first pressure detection device is provided at the outlet of the baking soda silo, and a second pressure detection device is provided at the outlet of the second screw conveyor; A material emitter is provided between the second screw conveyor and the air outlet side of the centrifugal fan; The material launcher includes a first inlet, a second inlet and an outlet; The first inlet is communicated with the centrifugal fan, the second inlet is communicated with the second screw conveyor, and the outlet is communicated with the flue gas reaction tower; A third pressure detection device is arranged at the outlet of the material emitter.

2. The device according to claim 1, characterized in that An air-locking discharger is provided between the second inlet and the second screw conveyor.

3. The device according to claim 1, characterized in that A venturi tube is provided between the outlet and the flue gas reaction tower; The outlet is communicated with the throat of the Venturi, and the flue gas to be treated enters the flue gas reaction tower through the Venturi tube.

4. The device according to claim 1, characterized in that It also includes a bag filter, which is connected to the flue gas reaction tower, and the lower end of the bag filter is provided with an ash outlet.

5. The device according to claim 1, characterized in that The first screw conveyor and the second screw conveyor are both driven by variable frequency motors.

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