Powder conveying device, using method thereof and flue gas treatment equipment

Abstract

The invention discloses a powder conveying device, and belongs to the field of flue gas treatment technical equipment. According to the device, a low-humidity and low-CO2-concentration fluidizing medium which flows through high-capacity calcium-based absorbent fine powder in the stock bin assembly is subjected to dust removal through the dust remover at the top of the stock bin assembly and then is conveyed to an inlet of the conveying fan through the exhaust fan to serve as conveying air, the carbonization reaction of the calcium-based absorbent is remarkably inhibited, and the carbonization efficiency of the calcium-based absorbent is improved. Therefore, the problem that the calcium-based absorbent fine powder forms hard scale blockage at parts such as an elbow and a reducing section of a conveying pipeline is solved, and a conveying system is ensured not to be blocked for a long time. In addition, the whole powder conveying device is very simple, the manual operation and maintenance cost and the one-time investment cost of a conveying pipeline are greatly reduced, and the system reliability is remarkably improved.

Description

Technical Field

[0001] The present application relates to the field of flue gas treatment technology and equipment, and in particular to a powder conveying device and a method for using the same, and flue gas treatment equipment. Background Art

[0002] Dry deacidification is a process technology that uses a pneumatic conveying fan to transport absorbent powder with good activity to the flue or reactor through a pipeline to react with pollutants such as SO2, SO3, HCl, HF, etc. in the flue gas to achieve efficient removal. It is widely used in coking, steel, waste incineration, coal-fired power plants, cement plants, etc. Calcium-based absorbent powders, such as slaked lime and carbide slag, react with flue gas pollutants to generate byproducts that are environmentally friendly, and therefore are increasingly used.

[0003] In order to improve the deacidification efficiency of calcium-based absorbents, it is usually necessary to use absorbent powder with higher purity and smaller particle size. However, fine absorbent powder is easy to adhere to the pipe wall at elbows, reducers and other parts during pneumatic conveying. When the powder adheres, it will react with CO2 in the conveying air to form calcium carbonate. As time goes by, the amount of calcium carbonate generated gradually increases, and layers of hard scale will form on the pipe wall, even causing the ash conveying pipe to be blocked. Summary of the invention

[0004] The embodiment of the present application provides a powder conveying device and a method of using the same, and a flue gas treatment device, which can solve the problem in the prior art that powder easily causes ash conveying pipe blockage. The technical solution is as follows:

[0005] On the one hand, a powder conveying device is provided, the powder conveying device is used to cooperate with a terminal smoke circulation structure, and the powder conveying device includes:

[0006] Silo components, fluidizing components, dust collectors, exhaust fans, conveying control valves and conveying fans;

[0007] The silo assembly has a cavity for carrying powder;

[0008] The fluidizing component is installed on the silo assembly, the air inlet of the fluidizing component is connected to the fluidizing medium gas source, and the fluidizing component introduces the fluidizing medium gas into the cavity;

[0009] The inlet of the dust collector is in communication with the outlet of the silo assembly;

[0010] The inlet of the exhaust fan is connected to the outlet of the dust collector;

[0011] The delivery regulating valve is installed between the outlet of the exhaust fan and the inlet of the delivery fan;

[0012] The silo assembly is used to convey powder with a preset flow rate to the outlet of the conveying fan.

[0013] Optionally, the silo assembly comprises: a silo and a feeding adjustment mechanism, the silo having the cavity, and the feeding adjustment mechanism being installed at the outlet of the silo;

[0014] Wherein, the feeding regulating mechanism is used to regulate the flow rate of the powder delivered to the outlet of the conveying fan.

[0015] Optionally, the powder conveying device further includes: an ejector, wherein the ejector is installed between the outlet of the conveying fan and the outlet of the feeding regulating mechanism.

[0016] Optionally, the powder conveying device further comprises: an exhaust regulating valve and a one-way valve, wherein the inlet of the exhaust regulating valve is distributed between the outlet of the exhaust fan and the inlet of the conveying regulating valve; and the one-way valve is installed at the outlet of the exhaust regulating valve;

[0017] Part of the fluidizing medium gas flowing out of the outlet of the exhaust fan is discharged in sequence by the exhaust regulating valve and the one-way valve.

[0018] Optionally, the powder conveying device also includes: a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline and a sixth pipeline, wherein the two ends of the first pipeline are respectively connected to the outlet of the dust collector and the inlet of the exhaust fan; the two ends of the second pipeline are respectively connected to the outlet of the exhaust fan and the inlet of the conveying regulating valve; the two ends of the third pipeline are respectively connected to the outlet of the conveying regulating valve and the inlet of the conveying fan; the two ends of the fourth pipeline are respectively connected to the outlet of the conveying fan and the inlet of the injector; the two ends of the fifth pipeline are respectively connected to the outlet of the feeding regulating mechanism and the inlet of the injector; one end of the sixth pipeline is connected to the second pipeline, and the emptying regulating valve and the one-way valve are both arranged on the sixth pipeline.

[0019] Optionally, the silo comprises: a first tank body and a second tank body connected to each other, the feed regulating mechanism is installed at the outlet of the first tank body, the fluidizing component is installed on the first tank body, and the dust collector is installed at the outlet of the second tank body;

[0020] The first tank body is conical, and an opening area of ​​an end of the first tank body close to the second tank body is larger than an opening area of ​​an end of the first tank body away from the second tank body.

[0021] On the other hand, a method for using a powder conveying device is provided, wherein the powder conveying device is any of the powder conveying devices described above, and the method comprises:

[0022] Controlling the fluidizing component to be in a working state;

[0023] Controlling the dust collector, the exhaust fan, the conveying regulating valve and the conveying fan to open;

[0024] The silo assembly is controlled to convey powder material with a preset flow rate to the outlet of the conveying fan.

[0025] Optionally, the silo assembly comprises: a silo and a feeding adjustment mechanism, the silo has the cavity, and the feeding adjustment mechanism is installed at the outlet of the silo; the method comprises:

[0026] The feeding regulating mechanism regulates the flow rate of the powder material flowing out of the outlet of the silo to the preset flow rate.

[0027] Optionally, the powder conveying device further includes: an exhaust regulating valve and a one-way valve, wherein the inlet of the exhaust regulating valve is distributed between the outlet of the exhaust fan and the inlet of the conveying regulating valve; the one-way valve is installed at the outlet of the exhaust regulating valve; after the powder conveying device completes conveying, the method further includes:

[0028] Controlling the feeding regulating mechanism to close;

[0029] Controlling the delivery regulating valve and the delivery fan to close;

[0030] The fluidizing gas output by the exhaust fan is controlled to be discharged through the exhaust regulating valve and the one-way valve.

[0031] On the other hand, a flue gas treatment device is provided, which includes: a powder conveying device and a terminal flue gas circulation structure, the conveying fan in the powder conveying device introduces the fluidizing medium gas mixed with powder into the terminal flue gas circulation structure, and the powder conveying device is any of the powder conveying devices described above.

[0032] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0033] The low-humidity and low-CO2-concentration fluidized medium that flows through the large-capacity calcium-based absorbent fine powder in the silo component is dedusted by the dust collector on the top of the silo component and then sent to the inlet of the conveying fan through the exhaust fan as the conveying air, which significantly inhibits the carbonization reaction of the calcium-based absorbent, thereby solving the problem of calcium-based absorbent fine powder forming hard scale blockage in the elbows, reducers and other parts of the conveying pipeline, ensuring that the conveying system will not be blocked for a long time. In addition, the entire powder conveying device is very simple, which greatly reduces the manual operation and maintenance costs and one-time investment costs of the conveying pipeline, and significantly improves the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 It is a structural schematic diagram of a powder conveying device provided in an embodiment of the present application;

[0036] Figure 2 is a schematic structural diagram of another powder conveying device provided in an embodiment of the present application;

[0037] Figure 3 It is a structural schematic diagram of a flue gas treatment device provided in an embodiment of the present application.

[0038] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention or the invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0042] Please refer to Figure 1 , Figure 1 Schematic diagram of a powder material conveying device provided in an embodiment of the present application. The powder material conveying device 000 may include: a silo assembly 100, a fluidizing component 200, a dust collector 300, an exhaust fan 400, a conveying regulating valve 500 and a conveying fan 600.

[0043] The silo assembly 100 in the powder conveying device 000 may have a cavity Q for carrying powder. For example, the cavity Q may store fine powder of calcium-based absorbent such as slaked lime and carbide slag with calcium hydroxide as the main component.

[0044] The fluidizing component 200 in the powder conveying device 000 can be installed on the silo assembly 100, and the air inlet a1 of the fluidizing component 200 can be connected to the fluidizing medium gas source, and the fluidizing component 200 can introduce the fluidizing medium gas into the cavity Q of the silo assembly 100. The fluidizing component 200 can adopt one or more of a disc fluidizer, a pulse fluidizer, a cone fluidizer, a fluidizing plate, a fluidizing disc, etc. according to the physical properties of the calcium-based absorbent powder.

[0045] The inlet of the dust collector 300 in the powder conveying device 000 may be in communication with the outlet of the silo assembly 100 .

[0046] The inlet of the exhaust fan 400 in the powder conveying device 000 may be communicated with the outlet of the dust collector 300. For example, the exhaust fan 400 may be a centrifugal fan.

[0047] The conveying regulating valve 500 in the powder conveying device 000 may be installed between the outlet of the exhaust fan 400 and the inlet of the conveying fan 600. For example, the conveying regulating valve 500 may be a ball valve, a butterfly valve or a regulating valve.

[0048] The silo assembly 100 in the powder conveying device 000 can be used to convey powder with a preset flow rate to the outlet of the conveying fan 600. For example, the conveying fan 600 can be one of a Roots blower and a centrifugal blower.

[0049] For example, when the powder conveying device 000 is used to introduce powder into the terminal flue gas circulation structure 001, the fluidizing component 200 is first turned on, the dust collector 300, the exhaust fan 400, and the conveying regulating valve 500 are all turned on, and the exhaust fan discharges the fluidized medium gas in the cavity through the dust collector to ensure that the exhaust dust concentration is low enough, and the conveying fan 600 is started to convey the powder; then, the silo component 100 conveys the powder fluidized by the fluidizing component 200 to the outlet of the conveying fan 600, and under the action of the conveying fan 600, it is conveyed to the terminal flue gas circulation structure 001. When the powder conveying device 000 stops conveying, the silo component 100 first stops conveying powder to the outlet of the conveying fan 600, and then delays the interlocking to close the conveying fan 600 and the conveying regulating valve 500. For example, the air inlet a1 of the fluidizing component 200 is connected to a fluidizing medium gas source that meets quality requirements, so that the calcium-based absorbent powder in the cavity Q of the silo assembly 100 is kept in a fluidized state.

[0050] In the embodiment of the present application, the fluidized medium with low humidity and low CO2 concentration after passing through the large-capacity calcium-based absorbent fine powder in the silo assembly 100 is dedusted by the dust collector 300 on the top of the silo assembly 100, and then sent to the inlet of the conveying fan 600 through the exhaust fan 400 as the conveying wind, which significantly inhibits the carbonization reaction of the calcium-based absorbent, thereby solving the problem of calcium-based absorbent fine powder forming hard scale blockage in the elbows, reducers and other parts of the conveying pipeline, ensuring that the conveying system will not be blocked for a long time. In addition, the entire powder conveying device is very simple, which greatly reduces the manual operation and maintenance costs and one-time investment costs of the conveying pipeline, and significantly improves the system reliability.

[0051] It should be noted that the rate at which calcium-based absorbent fine powder forms hard scale is mainly related to the moisture content and CO2 concentration in the conveying air. Reducing the moisture content and CO2 concentration in the conveying air will directly and significantly slow down the rate of hard scale formation.

[0052] In summary, the embodiments of the present application provide a powder conveying device, which may include: a silo assembly, a fluidizing component, a dust collector, an exhaust fan, a conveying regulating valve, and a conveying fan. The fluidizing medium with low humidity and low CO2 concentration that flows through the large-capacity calcium-based absorbent fine powder in the silo assembly is dedusted by the dust collector on the top of the silo assembly, and then sent to the inlet of the conveying fan through the exhaust fan as the conveying air, which significantly inhibits the carbonization reaction of the calcium-based absorbent, thereby solving the problem of calcium-based absorbent fine powder forming hard scale blockage in the elbows, reducers and other parts of the conveying pipeline, ensuring that the conveying system will not be blocked for a long time. In addition, the entire powder conveying device is very simple, which greatly reduces the manual operation and maintenance costs and one-time investment costs of the conveying pipeline, and significantly improves the reliability of the system.

[0053] Optional, please refer to Figure 2 , Figure 2 It is a structural schematic diagram of another powder conveying device provided in an embodiment of the present application. The silo assembly 100 in the powder conveying device 000 may include: a silo 101 and a feeding adjustment mechanism 102, the silo 101 may have a cavity Q for carrying powder, and the feeding adjustment mechanism 102 may be installed at the outlet of the silo 101. Among them, the feeding adjustment mechanism 102 can be used to adjust the flow rate of the powder delivered to the outlet of the conveying fan 600. In this way, the powder in the cavity Q can be delivered to the outlet of the conveying fan 600 through the feeding adjustment mechanism 102, and the feeding adjustment mechanism 102 can adjust the flow rate of the powder delivered to the outlet of the conveying fan 600. For example, the feeding adjustment mechanism 102 can be one or more of a rotary feeder, a screw feeder, a star feeder, a vibrating feeder, a scraper feeder, and the like.

[0054] In the embodiments of the present application, Figure 2As shown, the powder conveying device 000 may further include: an ejector 700, which may be installed between the outlet of the conveying fan 600 and the outlet of the feeding regulating mechanism 102. Thus, by arranging the ejector 700 between the outlet of the conveying fan 600 and the outlet of the feeding regulating mechanism 102, the powder and the fluidizing medium gas can be mixed in the ejector 700, thereby improving the conveying effect of the powder. For example, the ejector 700 may be a three-way pipe, and a venturi tube may be arranged in the ejector.

[0055] Optional, such as Figure 2 As shown, the powder conveying device 000 may further include: an emptying regulating valve 800 and a one-way valve 900, and the inlet of the emptying regulating valve 800 may be distributed between the outlet of the exhaust fan 400 and the inlet of the conveying regulating valve 500. The one-way valve 900 may be installed at the outlet of the emptying regulating valve 800. Part of the fluidizing medium gas flowing out of the outlet of the exhaust fan 400 may be discharged in sequence by the emptying regulating valve 800 and the one-way valve 900. For example, when the powder conveying device 000 stops conveying powder, the feeding regulating mechanism 102 is closed first, and then the conveying fan 600 and the conveying regulating valve 500 are closed by delay interlocking, and the exhaust gas of the silo is completely discharged from the system through the emptying regulating valve 800 and the one-way valve 900.

[0056] It should be noted that, during the process of powder conveying by the powder conveying device 000, the exhaust regulating valve 800 and the one-way valve 900 are also opened. Due to the low-pressure area formed by the conveying fan 600, most of the fluidizing medium gas discharged by the exhaust fan 400 is transported to the conveying fan 600 through the conveying regulating valve 500, while a small part of the fluidizing medium gas is discharged into the external environment through the exhaust regulating valve 800 and the one-way valve 900.

[0057] In the embodiments of the present application, Figure 2As shown, the powder conveying device 000 also includes: a first pipeline 1000, a second pipeline 1100, a third pipeline 1200, a fourth pipeline 1300, a fifth pipeline 1400 and a sixth pipeline 1500, the two ends of the first pipeline 1000 are respectively connected to the outlet of the dust collector 300 and the inlet of the exhaust fan 400; the two ends of the second pipeline 1100 are respectively connected to the outlet of the exhaust fan 400 and the inlet of the conveying regulating valve 500; the two ends of the third pipeline 1200 are respectively connected to the outlet of the exhaust fan 400 and the inlet of the conveying regulating valve 500; It is connected to the outlet of the conveying regulating valve 500 and the inlet of the conveying fan 600; the two ends of the fourth pipeline 1300 are respectively connected to the outlet of the conveying fan 600 and the inlet of the ejector 700; the two ends of the fifth pipeline 1400 are respectively connected to the outlet of the feeding regulating mechanism 102 and the inlet of the ejector 700; one end of the sixth pipeline 1500 is connected to the second pipeline 1100, and the emptying regulating valve 800 and the one-way valve 900 are both arranged on the sixth pipeline 1500.

[0058] Optional, such as Figure 2 As shown, the silo 101 may include: a first tank body 101a and a second tank body 101b connected to each other, the feeding regulating mechanism 102 may be installed at the outlet of the first tank body 101a, the fluidizing component 200 may be installed on the first tank body 101a, and the dust collector 300 may be installed at the outlet of the second tank body 101b. The first tank body 101a is conical, and the opening area of ​​the first tank body 101a close to the second tank body 101b may be larger than the opening area of ​​the end away from the second tank body 101b. In this way, by setting the first tank body 101a in the silo 101 in a conical shape, the fluidized powder in the silo 101 can be efficiently output from the cavity Q by the feeding regulating mechanism 102.

[0059] It should be noted that the powder conveying device may also include a control component (not shown in the figure), and the staff can control the various components in the powder conveying device by operating the control component. For example, the control component may include a touch screen and a processor, and a human-computer interaction interface may be displayed on the touch screen. The staff can operate on the human-computer interaction interface so that the processor receives the instructions sent by the staff and controls the various components in the powder conveying device according to the received instructions.

[0060] In summary, the embodiments of the present application provide a powder conveying device, which may include: a silo assembly, a fluidizing component, a dust collector, an exhaust fan, a conveying regulating valve, and a conveying fan. The fluidizing medium with low humidity and low CO2 concentration that flows through the large-capacity calcium-based absorbent fine powder in the silo assembly is dedusted by the dust collector on the top of the silo assembly, and then sent to the inlet of the conveying fan through the exhaust fan as the conveying air, which significantly inhibits the carbonization reaction of the calcium-based absorbent, thereby solving the problem of calcium-based absorbent fine powder forming hard scale blockage in the elbows, reducers and other parts of the conveying pipeline, ensuring that the conveying system will not be blocked for a long time. In addition, the entire powder conveying device is very simple, which greatly reduces the manual operation and maintenance costs and one-time investment costs of the conveying pipeline, and significantly improves the reliability of the system.

[0061] The present application also provides a method for using a powder conveying device, which may be any of the above-mentioned powder conveying devices. The method for using the powder conveying device may include:

[0062] Step 101, controlling the fluidization component to be in working state;

[0063] Step 102, control the dust collector, exhaust fan, conveying regulating valve and conveying fan to be turned on;

[0064] Step 103: Control the silo assembly to convey powder with a preset flow rate to the outlet of the conveying fan.

[0065] In summary, the embodiment of the present application provides a method for using a powder conveying device, through which the low-humidity and low-CO2-concentration fluidized medium flowing through a large-capacity calcium-based absorbent fine powder in a silo component can be dedusted by a silo top dust collector and then sent to the inlet of a conveying fan as conveying air through an exhaust fan, which significantly inhibits the carbonization reaction of the calcium-based absorbent, thereby solving the problem of calcium-based absorbent fine powder forming hard scale blockage in the elbows, reducers and other parts of the conveying pipeline, ensuring that the conveying system does not get blocked for a long time. In addition, the entire powder conveying device is very simple, which greatly reduces the manual operation and maintenance costs and one-time investment costs of the conveying pipeline, and significantly improves the reliability of the system.

[0066] Optionally, the silo assembly in the powder conveying device may include: a silo and a feeding adjustment mechanism, the silo may have a cavity, and the feeding adjustment mechanism may be installed at the outlet of the silo. The method of using the powder conveying device may include:

[0067] Step 201: The feed regulating mechanism can regulate the flow rate of the powder flowing out of the outlet of the silo to a preset flow rate. It should be noted that the preset flow rate can be determined according to the power of the conveying fan and the specific use requirements of the terminal smoke circulation structure.

[0068] In the embodiment of the present application, when the powder conveying device includes an emptying regulating valve and a one-way valve, after the powder conveying device completes conveying, the method for using the powder conveying device may include:

[0069] Step 301, controlling the feeding regulating mechanism to close;

[0070] Step 302, control the delivery regulating valve and the delivery fan to close;

[0071] Step 303: Control the fluidizing gas output by the exhaust fan to be discharged through the exhaust regulating valve and the one-way valve.

[0072] In this way, when the feeding adjustment mechanism is closed, the delayed interlock will close the conveying fan and the conveying regulating valve, and the exhaust gas from the silo will all be discharged from the system through the exhaust regulating valve and the one-way valve, thereby achieving smooth switching of the system.

[0073] The present application also provides a flue gas treatment device, please refer to Figure 3 , Figure 3 It is a structural schematic diagram of a flue gas treatment device provided in an embodiment of the present application. It may include: a powder conveying device and a terminal flue gas circulation structure, and the conveying fan in the powder conveying device introduces the fluidized medium gas mixed with powder into the terminal flue gas circulation structure. For example, the powder conveying device can be any of the powder conveying devices given above. In this way, the powder conveying device can convey the improved powder to the terminal flue gas circulation structure.

[0074] It should be noted that the sequence of steps in the method for using the powder conveying device provided in the embodiment of the present invention can be appropriately adjusted, and the steps can be increased or decreased accordingly according to the circumstances. Any technician familiar with the technical field can easily think of the changed methods within the technical scope disclosed by the present invention, and they should be covered within the protection scope of the present invention, so they will not be repeated here.

[0075] The embodiments of the powder conveying device and the embodiments of the method for using the powder conveying device provided in the embodiments of the present invention can be referred to each other, and the embodiments of the present invention will not be described in detail here.

[0076] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0077] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A powder conveying device, characterized in that: The powder material conveying device is used to cooperate with the terminal smoke flow structure, and the powder material conveying device includes: a silo assembly, a fluidizing component, a dust collector, an exhaust fan, a conveying regulating valve and a conveying fan; The silo assembly has a cavity for carrying powder; The fluidizing component is installed on the silo assembly, the air inlet of the fluidizing component is connected to the fluidizing medium gas source, and the fluidizing component introduces the fluidizing medium gas into the cavity; The inlet of the dust collector is in communication with the outlet of the silo assembly; The inlet of the exhaust fan is connected to the outlet of the dust collector; The delivery regulating valve is installed between the outlet of the exhaust fan and the inlet of the delivery fan; The silo assembly is used to convey powder with a preset flow rate to the outlet of the conveying fan.

2. The powder conveying device according to claim 1, characterized in that: The silo assembly comprises: a silo and a feeding adjustment mechanism, the silo has the cavity, and the feeding adjustment mechanism is installed at the outlet of the silo; Wherein, the feeding regulating mechanism is used to regulate the flow rate of the powder delivered to the outlet of the conveying fan.

3. The powder conveying device according to claim 2, characterized in that: The powder conveying device further comprises: an ejector, which is installed between the outlet of the conveying fan and the outlet of the feeding regulating mechanism.

4. The powder conveying device according to claim 3, characterized in that: The powder conveying device further comprises: an exhaust regulating valve and a one-way valve, wherein the inlet of the exhaust regulating valve is distributed between the outlet of the exhaust fan and the inlet of the conveying regulating valve; the one-way valve is installed at the outlet of the exhaust regulating valve; Part of the fluidizing medium gas flowing out of the outlet of the exhaust fan is discharged in sequence by the exhaust regulating valve and the one-way valve.

5. The powder conveying device according to claim 4, characterized in that: The powder conveying device also includes: a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline and a sixth pipeline, wherein the two ends of the first pipeline are respectively connected to the outlet of the dust collector and the inlet of the exhaust fan; the two ends of the second pipeline are respectively connected to the outlet of the exhaust fan and the inlet of the conveying regulating valve; the two ends of the third pipeline are respectively connected to the outlet of the conveying regulating valve and the inlet of the conveying fan; the two ends of the fourth pipeline are respectively connected to the outlet of the conveying fan and the inlet of the ejector; the two ends of the fifth pipeline are respectively connected to the outlet of the feeding regulating mechanism and the inlet of the ejector; one end of the sixth pipeline is connected to the second pipeline, and the emptying regulating valve and the one-way valve are both arranged on the sixth pipeline.

6. The powder conveying device according to any one of claims 2 to 5, characterized in that: The silo comprises: a first tank body and a second tank body connected to each other, the feed regulating mechanism is installed at the outlet of the first tank body, the fluidizing component is installed on the first tank body, and the dust collector is installed at the outlet of the second tank body; The first tank body is conical, and an opening area of ​​an end of the first tank body close to the second tank body is larger than an opening area of ​​an end of the first tank body away from the second tank body.

7. A method for using a powder conveying device, characterized in that: The powder conveying device is the powder conveying device according to any one of claims 1 to 6, and the method comprises: Controlling the fluidizing component to be in a working state; Controlling the dust collector, the exhaust fan, the conveying regulating valve and the conveying fan to open; The silo assembly is controlled to convey powder material with a preset flow rate to the outlet of the conveying fan.

8. The method for using the powder conveying device according to claim 7, characterized in that: The silo assembly comprises: a silo and a feeding adjustment mechanism, the silo has the cavity, and the feeding adjustment mechanism is installed at the outlet of the silo; the method comprises: The feeding regulating mechanism regulates the flow rate of the powder material flowing out of the outlet of the silo to the preset flow rate.

9. The method for using the powder conveying device according to claim 8, characterized in that: The powder conveying device further comprises: an exhaust regulating valve and a one-way valve, wherein the inlet of the exhaust regulating valve is distributed between the outlet of the exhaust fan and the inlet of the conveying regulating valve; the one-way valve is installed at the outlet of the exhaust regulating valve; after the powder conveying device completes conveying, the method further comprises: Controlling the feeding regulating mechanism to close; Controlling the delivery regulating valve and the delivery fan to close; The fluidizing gas output by the exhaust fan is controlled to be discharged through the exhaust regulating valve and the one-way valve.

10. A flue gas treatment device, characterized in that: include: According to the powder conveying device and the terminal smoke circulation structure as described in any one of claims 1 to 6, the conveying fan in the powder conveying device introduces the fluidizing medium gas mixed with powder into the terminal smoke circulation structure.

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