A pulverized coal quantitative conveying device and method for deep peak regulation of thermal power

Abstract

The present application belongs to the technical field of powder conveying, and particularly relates to a coal powder quantitative conveying device and method for thermal power deep peak shaving, which comprises a cyclone separator, a material inlet of the cyclone separator is connected with a coal powder conveying pipeline, a gas phase outlet at the top of the cyclone separator is connected with a downstream coal powder conveying pipeline through a fan, and a solid phase outlet at the bottom of the cyclone separator is sequentially fixedly connected with an electric heavy hammer double-layer flap valve, a first shut-off valve, a coal powder buffer bin, a second shut-off valve, a three-way distributor, a third shut-off valve, a rotor weighing scale, a star feeder and a Venturi injection component, and further comprises an intelligent controller. The present application adopts the cyclone separator to perform gas-solid pre-separation, the coal powder buffer bin to perform buffer and flow stabilization, and the three-way distributor to divide a total working path into two branches, and simultaneously coordinates and controls the rotor weighing scale and the star feeder through the intelligent controller, so as to realize accurate metering of the coal powder material and long-period safe and stable operation.

Description

Technical Field

[0001] This invention belongs to the field of powder conveying technology, specifically relating to a quantitative conveying device and method for pulverized coal for deep peak shaving in thermal power plants. Background Technology

[0002] Under the "dual carbon" target, deep peak-shaving operation of thermal power units has become crucial for stable power grid operation. Precise quantitative conveying and continuous stable supply of pulverized coal are core technologies for achieving stable combustion without oil injection at low boiler loads, improving combustion efficiency, and reducing coal consumption and carbon emissions. These directly affect unit operating efficiency and enterprise production safety. Patent CN219750900U discloses a pulverized coal quantitative conveying device, using a conveying box and sieve plate to achieve quantitative conveying and auxiliary screening of pulverized coal, but it suffers from poor quantitative conveying effect and low operating efficiency. Patent CN110864323B discloses a pulverized coal quantitative feeding device for boilers, using quantitative cylinders of different volumes to achieve quantitative control of pulverized coal, but it suffers from inconvenient operation and poor operational stability. Patent CN118856353A discloses a pulverized coal quantitative conveying system and a pulverized coal industrial boiler system, including a storage bin, a coal supply unit, a guide fluid, and an air duct. This system effectively reduces bridging and arching during pulverized coal conveying, prevents coal blockage, and achieves quantitative pulverized coal conveying. It also reduces supply fluctuations and ensures stable equipment operation. However, this system still needs to be integrated with other equipment / systems to achieve accurate quantitative pulverized coal conveying. Currently, existing pulverized coal quantitative conveying devices generally suffer from frequent blockages, severe equipment wear, inaccurate metering, limited functionality, and poor adaptability. There is a lack of a comprehensive, integrated solution that is anti-blocking, wear-resistant, accurately metered, safe, reliable, and widely adaptable. Therefore, developing an anti-blocking, wear-resistant, accurately metered, safe, reliable, online-switchable pulverized coal quantitative conveying device suitable for deep peak shaving in thermal power plants has become an urgent need in the field of deep peak shaving in thermal power plants. Summary of the Invention

[0003] This invention addresses the aforementioned technical problems in the coal powder transportation process by providing a quantitative coal powder transportation device and method for deep peak shaving in thermal power plants.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A pulverized coal quantitative conveying device for deep peak shaving in thermal power plants includes a cyclone separator. The material inlet of the cyclone separator is connected to a pulverized coal conveying pipeline. The gas phase outlet at the top of the cyclone separator is connected to a downstream pulverized coal conveying pipeline via a fan. The solid phase outlet at the bottom of the cyclone separator is sequentially and fixedly connected to an electric counterweight double-layer flap valve, a first shut-off valve, a pulverized coal buffer silo, a second shut-off valve, and a three-way distributor. The lower end of the three-way distributor is provided with two symmetrically parallel conveying branches. The lower end of each conveying branch is sequentially provided with a third shut-off valve, a rotor weighing scale, a star feeder, and a Venturi jet component. One of the conveying branches serves as a backup branch. The device also includes an intelligent controller, which is wired to the fan, the electric counterweight double-layer flap valve, the first shut-off valve, the pulverized coal buffer silo, the second shut-off valve, the third shut-off valve, the rotor weighing scale, and the star feeder.

[0005] Furthermore, the inner wall of the pulverized coal buffer silo is polished. The pulverized coal buffer silo includes a feed inlet, with a cylindrical section at the lower end of the feed inlet and a conical section below the cylindrical section. The generatrix angle between the cylindrical section and the conical section is not less than 60°. A safety valve is provided at one end of the top of the cylindrical section, and a dust removal and pressure relief port is provided at the other end of the top of the cylindrical section. Multiple first air cannon interfaces and first temperature measuring points are provided on one end of the side wall of the cylindrical section. The multiple first air cannon interfaces are arranged horizontally on the cylindrical section. A manhole and a high-level gauge are provided at the other end of the wall. Multiple second air cannon interfaces, multiple second temperature measuring points and sampling ports are provided on one end of the side wall of the conical section. Multiple third air cannon interfaces and a low-level gauge are provided on the other end of the side wall of the conical section. The second and third air cannon interfaces are arranged with the outer edge higher than the inner edge in the conical section, and the angle with the horizontal plane is ≥15°. Temperature sensors are provided at the first and second temperature measuring points. The temperature sensors, high-level gauge and low-level gauge are all connected to the intelligent controller via wired connection.

[0006] Furthermore, the Venturi jetting component includes a housing, with a connection port on the upper part of the housing, which connects to the outlet of the star feeder. The interior of the housing is arranged from left to right as an inlet section, a contraction section, a throat section, a flaring section, and an outlet section. The length of the contraction section is 2 to 4 times the diameter of the throat section, and the included angle between the extended lines of the two generatrices of the contraction section is 15° to 25°. The length-to-diameter ratio of the throat section is 1.5 to 3:1. The length of the flaring section is set to 5 to 7 times the diameter of the throat section, and the included angle between the extended lines of the two generatrices of the flaring section is 6° to 12°.

[0007] Furthermore, the cyclone separator is configured with a tangential feeding structure and includes a column and a cone. The column height-to-diameter ratio of the cyclone separator is 1.4 to 3:1. The diameter of the central cylinder of the cyclone separator is 2 / 5 to 3 / 5 of the inner diameter of the column. The depth to which the central cylinder of the cyclone separator is inserted into the column is 1 / 2 to 3 / 5 of the height of the column. The cone angle between the column and the cone of the cyclone separator is 15° to 20°. The inner wall of the cyclone separator and the inner and outer surfaces of the central cylinder are provided with a ceramic or tungsten carbide wear-resistant layer.

[0008] Furthermore, the electric counterweight double-layer flap valve adopts a double-layer flap structure, which has continuous unloading and sealing and air-locking functions to suppress pressure fluctuations in the system pipeline.

[0009] Furthermore, the upper and lower ends of the rotor metering scale are connected to the upstream pipeline and the downstream star feeder respectively through flexible hoses. The blades and inner walls of the rotor metering scale and the star feeder are all treated with wear resistance. Both are equipped with torque overload protection mechanisms. This device features a compact structure, small footprint, and high metering accuracy. It can adapt to the demand for small flow and high precision coal powder supply at the hundred-kilogram level. It has manual and automatic operation modes and can be used for pilot-scale, industrial demonstration, and industrial application research in the fields of coal powder combustion and gasification.

[0010] A method of using a pulverized coal quantitative conveying device for deep peak shaving in thermal power plants includes the following steps: (1) System self-test: Start the intelligent controller, the intelligent controller enters the running mode, and the intelligent controller automatically tests whether the equipment and instruments such as the fan, electric hammer double-layer flap valve, first shut-off valve, coal powder buffer bin, second shut-off valve, third shut-off valve, rotor metering scale, star feeder, temperature sensor, high level gauge and low level gauge are normal. (2) Gas-solid separation feeding: The gas flow containing coal powder enters the cyclone separator through the coal powder conveying pipeline to complete the gas-solid separation. The gas phase medium is conveyed from the top air outlet to the downstream coal powder conveying pipe by the blower. The solid coal powder enters the coal powder buffer bin through the electric hammer double-layer flap valve and the first shut-off valve in sequence. (3) Buffering and stabilizing flow and real-time monitoring: The coal powder is buffered and stabilized in the coal powder buffer bin. The high level gauge, low level gauge and temperature sensor transmit the collected data in real time through the intelligent controller. The dust removal and pressure relief port maintains a slight positive pressure in the coal powder buffer bin in real time. The first air cannon interface, the second air cannon interface and the third air cannon interface are all in standby state to prevent coal powder from bridging, arching and blocking. (4) Quantitative conveying of pulverized coal: The intelligent controller opens the second shut-off valve, and the pulverized coal enters the three-way distributor. The intelligent controller selects a single branch as the working branch and opens the corresponding third shut-off valve. The rotor metering scale measures the pulverized coal flow rate in real time and feeds it back to the intelligent controller. The intelligent controller adjusts the speed of the star feeder through the feedback information to achieve secondary quantitative feeding. The pulverized coal is continuously conveyed quantitatively by the negative pressure ejection of the Venturi jet component. (5) Online switching and maintenance: When one of the working branch equipment is abnormal, the intelligent controller detects and shuts down the working branch, and simultaneously opens the third shut-off valve, rotor metering scale and star feeder of the backup branch, so as to realize online switching and maintenance of the working branch.

[0011] Furthermore, the air source for the external air cannons connected to the first, second, and third air cannon interfaces is set to dry, ash-free compressed air, nitrogen, or carbon dioxide, with the air source pressure controlled at 0.4~0.8MPa.

[0012] Compared with the prior art, the present invention has the following advantages: 1. This invention uses a cyclone separator for gas-solid pre-separation, a coal powder buffer bin for buffering and stabilizing the flow, and a three-way distributor to divide the main working path into two branches. At the same time, an intelligent controller coordinates and controls the rotor metering scale and the star feeder to achieve accurate metering of coal powder materials and long-term safe and stable operation.

[0013] 2. The cyclone separator and the pulverized coal buffer chamber of the present invention both adopt a large cone angle chamber body, and the pulverized coal buffer chamber is provided with a top pressure relief port, multiple first air cannon interfaces, second air cannon interfaces and third air cannon interfaces. At the same time, combined with the Venturi injection component, it effectively solves the problems of pulverized coal bridging, pulverized coal blockage and poor material discharge.

[0014] 3. The inner wall of the cyclone separator, the rotor weighing scale, the blades of the star feeder, and the inner wall of the housing of this invention are all treated with wear-resistant materials, which enhances the overall wear resistance of the device and reduces the operation and maintenance costs.

[0015] 4. This invention uses a rotor weighing scale and a star feeder to weigh coal powder twice. The intelligent controller monitors and controls the weight of coal powder in real time to obtain accurate coal powder weighing data, effectively reducing operational errors caused by measurement errors.

[0016] 5. This invention achieves a dual-path parallel design through a three-way distributor, effectively preventing the second path equipment from operating normally and being put into use when one working path equipment malfunctions, thus ensuring work efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2This is a schematic diagram of the structure of the pulverized coal buffer bin of the present invention; Figure 3 This is a schematic diagram of the structure of the Venturi jet component of the present invention; In the diagram, 1 is a cyclone separator, 2 is a pulverized coal conveying pipeline, 3 is a blower, 4 is an electric counterweight double-layer flap valve, 5 is a first shut-off valve, 6 is a pulverized coal buffer silo, 601 is a feed inlet, 602 is a cylindrical section, 603 is a conical section, 604 is a safety valve, 605 is a dust removal and pressure relief port, 606 is a first air cannon interface, 607 is a first temperature measuring point, 608 is a manhole, 609 is a high-level gauge, 610 is a second air cannon interface, 611 is a second temperature measuring point, 612 is a sampling port, 613 is a third air cannon interface, 614 is a low-level gauge, 7 is a second shut-off valve, 8 is a three-way distributor, 9 is a third shut-off valve, 10 is a rotor weighing scale, 11 is a star feeder, 12 is a venturi jet component, 1201 is a housing, 1202 is a connection port, 1203 is an inlet section, 1204 is a contraction section, 1205 is a throat section, 1206 is a flared section, and 1207 is an outlet section. Detailed Implementation

[0018] To further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0019] This invention features a compact structure, small footprint, and high metering accuracy. It is suitable for supplying small-flow, high-precision pulverized coal at the hundred-kilogram level and has both manual and automatic operation modes. It can be used for pilot-scale, industrial demonstration, and industrial application research in fields such as pulverized coal combustion and gasification. Specific embodiments are as follows: Example 1

[0020] like Figures 1 to 3 As shown, a 100-kilogram-level pulverized coal conveying device for pilot testing includes a pulverized coal buffer silo 6, a second shut-off valve 7, a three-way distributor 8, a third shut-off valve 9, a rotor weighing scale 10, a star feeder 11, and a Venturi jetting component 12. One or more units of this pulverized coal conveying device can be flexibly arranged according to experimental requirements. Before the pilot test, pulverized coal material needs to be added to the pulverized coal buffer silo 6. During the pilot test, the second shut-off valve 7 below the pulverized coal buffer silo 6 is opened via an intelligent controller, and one branch of the three-way distributor 8 is selected as the working branch. Open the third shut-off valve 9 of this branch, start and adjust the coal powder flow rate of the rotor metering scale 10 and the star feeder 11, and the coal powder is injected into the downstream area by the negative pressure of the Venturi injection component 12; among them, the coal powder buffer silo 6 is designed with a capacity of 100-200kg / h, the range of the rotor metering scale 10 and the star feeder 11 is matched with the design capacity of the coal powder buffer silo 6, the dust removal and pressure relief port at the top of the coal powder buffer silo 6 can be left unused, and the inlet section 1203 of the Venturi injection component 12 can be connected to auxiliary air source equipment such as plant hot air, cold air and fans. Example 2

[0021] like Figures 1 to 3 As shown, a pulverized coal quantitative conveying device for deep peak shaving in a 300MW-class tangentially circular thermal power unit includes a cyclone separator 1, pulverized coal conveying pipeline 2, a fan 3, an electric counterweight double-layer flap valve 4, a first shut-off valve 5, a pulverized coal buffer silo 6, a second shut-off valve 7, a three-way distributor 8, a third shut-off valve 9, a rotor weighing scale 10, a star feeder 11, and a Venturi jetting component 12. This pulverized coal quantitative conveying device can be arranged in a tangentially circular pattern near the pulverized coal pipe at the bottom or sub-bottom of the boiler, with four units or arranged diagonally, according to the unit's requirements. Two units are installed; pulverized coal enters cyclone separator 1 via pulverized coal conveying pipeline 2. The gaseous component flows back to the downstream pulverized coal conveying pipeline 2 via the top outlet of cyclone separator 1 and fan 3. The solid pulverized coal enters the pulverized coal buffer silo 6 via the bottom outlet of cyclone separator 1, electric counterweight double-layer flap valve 4, and first pneumatic shut-off valve 5. The intelligent controller opens the second shut-off valve 7, and the pulverized coal enters the three-way distributor 8. One branch of the three-way distributor 8 is selected as the working branch, and the third shut-off valve 9 of that branch is opened. The rotor metering scale 10 measures in real time and feeds back to the intelligent controller. The controller adjusts the rotation speed of the star feeder 11 to achieve secondary metering feeding. Coal powder is ejected under negative pressure by the Venturi jet component 12, achieving continuous and stable conveying of the coal powder. The coal powder buffer silo 6 has a designed capacity of 0-1000 kg / h. The range of the rotor metering scale 10 and the star feeder 11 matches the designed capacity of the coal powder buffer silo 6. The inlet section 1203 of the Venturi jet component 12 can be connected to auxiliary air sources such as plant hot air, cold air, and fans. The inner and outer layers of the central cylinder of the cyclone separator 1 and the inner wall of the cyclone separator 1 are made of wear-resistant ceramic lining. The lining and pulverized coal buffer silo have a cone angle of 60°. It is equipped with a first air cannon interface 606, a second air cannon interface 610, and a third air cannon interface 613. The top dust removal and pressure relief port 605 is connected to the bag filter and the exhaust fan. The intelligent controller adopts remote industrial control computer and local PLC control. The industrial control computer can obtain the power plant boiler load dispatching instructions and the real-time load of the unit in real time. When the four pulverized coal quantitative conveying devices are put into operation at the same time, the minimum output load of the unit can be reduced by 5%-10% of the rated load, and the safe and stable operation of the unit under this load condition can be achieved. Example 3

[0022] A pulverized coal quantitative conveying device for deep peak shaving in a 600MW-class coal-fired power unit with opposing front and rear walls includes a cyclone separator 1, a pulverized coal conveying pipeline 2, a fan 3, an electric counterweight double-layer flap valve 4, a first shut-off valve 5, a pulverized coal buffer 6, a second shut-off valve 7, a three-way distributor 8, a third shut-off valve 9, a rotor metering scale 10, a star feeder 11, and a Venturi injection component 12. This pulverized coal quantitative conveying device can be centrally arranged in 4 units near the pulverized coal pipe on the bottom or second bottom layer of the boiler front / rear wall, or arranged in opposing front and rear wall configurations, depending on the unit's needs. Powdered coal enters cyclone separator 1 via pulverized coal conveying pipeline 2. The gaseous phase component flows back to the downstream pulverized coal conveying pipeline 2 via the top outlet of cyclone separator 1 and fan 3. The solid phase pulverized coal enters pulverized coal buffer silo 6 via the bottom outlet of cyclone separator 1, electric counterweight double-layer flap valve 4, and first pneumatic shut-off valve 5. The second shut-off valve 7 is opened, and the pulverized coal enters three-way distributor 8. One branch of three-way distributor 8 is selected as the working branch, and the third shut-off valve 9 of this branch is opened. Rotary metering scale 10 measures in real time and feeds back to the intelligent controller. The intelligent controller adjusts the speed of star feeder 11 to achieve secondary metering and feeding. The pulverized coal is ejected by negative pressure through Venturi jet component 12 to achieve continuous and stable conveying of pulverized coal. The pulverized coal buffer silo 6 is designed with a capacity of 0-2000 kg / h. The range of rotor metering scale 10 and star feeder 11 is related to the pulverized coal buffer. The design capacity of silo 6 is matched, and the inlet section 1203 of the Venturi jet component 12 can be connected to auxiliary air source equipment such as plant hot air, cold air and fans; the inner and outer layers of the central cylinder of the cyclone separator 1 and the inner wall of the separator are lined with ceramic wear-resistant material, the cone angle of the pulverized coal buffer silo 6 is 65°, and it is equipped with a total of 5 first air cannon interfaces 606, second air cannon interfaces 610 and third air cannon interfaces 613. The top is a dust removal and pressure relief port 605 connected to the bag filter and the exhaust fan. The intelligent controller adopts remote industrial control computer control and is also connected to the power plant boiler DCS control system to realize the synchronous regulation of the pulverized coal quantitative conveying device and the power plant unit load. When 4 pulverized coal quantitative conveying devices are put into operation at the same time, the minimum output load of the unit can be reduced by 10%-15% of the rated load, and the safe and stable operation of the unit under this load condition can be achieved. Example 4

[0023] A high-precision, anti-clogging, wear-resistant, and quantitative fly ash conveying device for industrial applications includes a cyclone separator 1, a fly ash conveying pipeline 2, a fan 3, an electric counterweight double-layer flap valve 4, a first shut-off valve 5, a fly ash buffer silo 6, a second shut-off valve 7, a three-way distributor 8, a third shut-off valve 9, a rotor weighing scale 10, a star feeder 11, and a Venturi jetting component 12. The wear-prone sections of the fly ash conveying device's pipeline are lined with wear-resistant ceramic, and the Venturi jetting component 12 is made with a tungsten carbide wear-resistant layer. This fly ash conveying device features anti-clogging, wear resistance, and accurate and reliable metering, meeting the requirements for long-term continuous industrial operation.

[0024] The foregoing has described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pulverized coal quantitative conveying device for deep peak shaving in thermal power plants, characterized in that: The cyclone separator (1) is connected to a coal powder conveying pipeline (2) at its material inlet. The gas phase outlet at the top of the cyclone separator (1) is connected to the downstream coal powder conveying pipeline (2) via a blower (3). The solid phase outlet at the bottom of the cyclone separator (1) is sequentially connected to an electric hammer double-layer flap valve (4), a first shut-off valve (5), a coal powder buffer silo (6), a second shut-off valve (7), and a three-way distributor (8). The lower end of the three-way distributor (8) is provided with two symmetrically connected parallel conveying supports. Each conveying branch is sequentially equipped with a third shut-off valve (9), a rotor weighing scale (10), a star feeder (11), and a Venturi jetting component (12). One of the conveying branches serves as a backup branch and also includes an intelligent controller. The intelligent controller is connected via wire to a fan (3), an electric hammer double-layer flap valve (4), a first shut-off valve (5), a pulverized coal buffer silo (6), a second shut-off valve (7), a third shut-off valve (9), a rotor weighing scale (10), and a star feeder (11).

2. The pulverized coal quantitative conveying device for deep load modulation of thermal power according to claim 1, characterized in that: The inner wall of the pulverized coal buffer silo (6) is polished. The pulverized coal buffer silo (6) includes an inlet (601). A cylindrical section (602) is provided at the lower end of the inlet (601). A conical section (603) is provided along the line segment of the cylindrical section (602). The generatrix angle between the cylindrical section (602) and the conical section (603) is not less than 60°. A safety valve (604) is provided at one end of the top of the cylindrical section (602). A dust removal and pressure relief port (605) is provided at the other end of the top of the cylindrical section (602). Multiple first air cannon interfaces (606) and a first temperature measuring point (607) are provided on one end of the side wall of the cylindrical section (602). The multiple first air cannon interfaces (606) are arranged horizontally on the cylindrical section (602). The other end of the side wall of the cone section (603) is provided with a manhole (608) and a high level gauge (609). The side wall of the cone section (603) is provided with multiple second air cannon interfaces (610), multiple second temperature measuring points (611) and sampling ports (612). The other end of the side wall of the cone section (603) is provided with multiple third air cannon interfaces (613) and low level gauges (614). The second air cannon interfaces (610) and the third air cannon interfaces (613) are arranged in a high-inner-high configuration in the cone section (603), and the angle with the horizontal plane is ≥15°. Temperature sensors are provided in the first temperature measuring point (607) and the second temperature measuring point (611). The temperature sensors, the high level gauge (609) and the low level gauge (614) are all connected to the intelligent controller via wired connection.

3. A pulverized coal quantitative conveying device for deep peak shaving in thermal power plants according to claim 1, characterized in that: The Venturi jetting component (12) includes a housing (1201), the upper part of which is provided with a connection port (1202) for connecting to the outlet of the star feeder (11). The interior of the housing (1201) is arranged from left to right as an inlet section (1203), a contraction section (1204), a throat section (1205), a flaring section (1206), and an outlet section (1207). The length of the contraction section (1204) is 2 to 4 times the diameter of the throat section (1205), the included angle of the two extended lines of the contraction section (1204) is 15° to 25°, the length-to-diameter ratio of the throat section (1205) is 1.5 to 3:1, the length of the flared section (1206) is set to 5 to 7 times the diameter of the throat section (1205), and the included angle of the two extended lines of the flared section (1206) is 6° to 12°.

4. A pulverized coal quantitative conveying device for deep peak shaving in thermal power plants according to claim 1, characterized in that: The cyclone separator (1) is configured with a tangential feeding structure and includes a column and a cone. The column height-to-diameter ratio of the cyclone separator (1) is 1.4 to 3:

1. The diameter of the central cylinder of the cyclone separator (1) is 2 / 5 to 3 / 5 of the inner diameter of the column. The depth to which the central cylinder of the cyclone separator (1) is inserted into the column is 1 / 2 to 3 / 5 of the column height. The cone angle between the column and the cone of the cyclone separator (1) is 15° to 20°. The inner wall of the cyclone separator (1) and the inner and outer surfaces of the central cylinder are provided with ceramic or tungsten carbide wear-resistant layers.

5. A pulverized coal quantitative conveying device for deep peak shaving in thermal power plants according to claim 3, characterized in that: The electric counterweight double-layer flap valve (4) adopts a double-layer flap structure and has continuous unloading and sealing functions to suppress pressure fluctuations in the system pipeline.

6. A pulverized coal quantitative conveying device for deep peak shaving in thermal power plants according to claim 1, characterized in that: The upper and lower ends of the rotor metering scale are respectively connected to the upstream pipe and the downstream star feeder (11) through flexible hoses. The blades and inner walls of the rotor metering scale and the star feeder (11) are all made of wear-resistant material, and both are equipped with torque overload protection mechanism.

7. A method of using a pulverized coal quantitative conveying device for deep peak shaving in thermal power plants according to any one of claims 2 to 6, characterized in that, Includes the following steps: (1) System self-test: Start the intelligent controller, the intelligent controller enters the running mode, and the intelligent controller automatically tests whether the display of the fan (3), electric hammer double-layer flap valve (4), first shut-off valve (5), coal powder buffer silo (6), second shut-off valve (7), third shut-off valve (9), rotor metering scale (10), star feeder (11), temperature sensor, high level gauge (609) and low level gauge (614) and other equipment and instruments is normal; (2) Gas-solid separation feeding: The gas flow containing coal powder enters the cyclone separator (1) through the coal powder conveying pipe (2) to complete the gas-solid separation. The gas phase medium is conveyed from the top air outlet to the downstream coal powder conveying pipe by the fan (3). The solid coal powder passes through the electric hammer double-layer flap valve (4) and the first shut-off valve (5) in sequence to enter the coal powder buffer bin (6). (3) Buffering and stabilizing flow and real-time monitoring: The coal powder is buffered and stabilized in the coal powder buffer bin (6). The high level gauge (609), low level gauge (614) and temperature sensor transmit the collected data in real time through the intelligent controller. The dust removal and pressure relief port (605) maintains a slight positive pressure in the coal powder buffer bin (6) in real time. The first air cannon interface (606), the second air cannon interface (610) and the third air cannon interface (613) are all in standby state to prevent coal powder from bridging, arching and blocking. (4) Quantitative conveying of pulverized coal: The intelligent controller opens the second shut-off valve (7), and the pulverized coal enters the three-way distributor (8). The intelligent controller selects a single branch as the working branch and opens the corresponding third shut-off valve (9). The rotor metering scale (10) measures the pulverized coal flow rate in real time and feeds it back to the intelligent controller. The intelligent controller adjusts the rotation speed of the star feeder (11) through the feedback information to achieve secondary quantitative feeding. The pulverized coal is continuously conveyed quantitatively by the negative pressure ejection of the Venturi jet component (12). (5) Online switching and maintenance: When one of the working branch equipment is abnormal, the intelligent controller detects and shuts down the working branch, and simultaneously opens the third shut-off valve (9), rotor metering scale (10), and star feeder (11) of the backup branch to realize the switching and maintenance of the working branch, which is suitable for the small flow and high precision coal powder supply needs of hundreds of kilograms.

8. The method of using a pulverized coal quantitative conveying device for deep peak shaving in thermal power plants according to claim 7, characterized in that: The external air cannons connected to the first air cannon interface (606), the second air cannon interface (610) and the third air cannon interface (613) are equipped with dry and ashless compressed air, nitrogen or carbon dioxide, and the air source pressure is controlled at 0.4~0.8MPa.

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