CN221164964U

CN221164964U - Powder conveying device

Info

Publication number: CN221164964U
Application number: CN202322956805.0U
Authority: CN
Inventors: 李赐章; 林启桃; 陈伟彬; 饶益龙; 林志强; 章俊华; 张原�; 林春源; 王建春
Original assignee: Fujian Longking Co Ltd.
Current assignee: Fujian Longking Co Ltd.
Priority date: 2023-11-02
Filing date: 2023-11-02
Publication date: 2024-06-18
Anticipated expiration: 2033-11-02

Abstract

The utility model relates to a powder conveying device, wherein a feed inlet of a bin inputs powder into the bin through compressed air. The feed inlet of the first rotary feeder is communicated with the discharge outlet of the stock bin. The feed inlet of the extraction chamber is communicated with the discharge port of the first rotary feeder. The feed inlet of the second rotary feeder is communicated with the discharge outlet of the extraction chamber. The first interface of the venturi ejector is communicated with the discharge port of the second rotary feeder, and air entering the second interface of the venturi ejector can flow to the third interface in an accelerating way. The air inlet end of the conveying air pipe is communicated with an external air source for air supply, and the air outlet end of the conveying air pipe is communicated with the second connector. The feeding end of the ash conveying pipe is communicated with the third interface, and the discharging end conveys powder to the outside. The air inlet end of the first air return pipe is communicated with the first air return port, and the air outlet end of the first air return pipe is communicated with the first air inlet. The air inlet end of the second air return pipe is communicated with the second air return port, and the air outlet end of the second air return pipe is communicated with the second air inlet. The air extraction fan drives the air flow in the first air return pipe and the second air return pipe, and the air extraction fan can be suitable for the working condition with smaller conveying capacity.

Description

Powder conveying device

Technical Field

The utility model relates to the field of powder conveying, in particular to a powder conveying device.

Background

At present, high-quality absorbent powder with large specific surface area is slowly applied to simple desulfurization and denitrification devices in coking industry and water Ni industry. Its advantages are high humidity, easy bridging and blocking discharge port, and high adhesion to pipe wall.

The prior powder conveying method comprises the following steps: pneumatic dense phase conveying, belt conveying, bucket lifting and the like. The pneumatic dense phase conveying is widely applied due to flexible arrangement mode and conveying distance, no pollution and lower maintenance requirement. However, pneumatic dense phase conveying needs to be provided with a bin pump, is generally used for working conditions with large conveying capacity, is not suitable for desulfurization and denitrification of a flue with small flue gas amount, and is high in manufacturing cost and complex in control. And the modes of belt conveying, bucket lifting conveying and the like easily cause ash adhesion on the belt and the bucket lifting machine, and the cleaning and maintenance difficulties are high. Based on this, a new powder conveying device is needed to solve these problems.

Disclosure of utility model

The present utility model is directed to a powder conveying device, which solves the above-mentioned problems in the prior art.

In order to solve the technical problems, the utility model adopts the following technical scheme.

The present utility model provides a powder conveying device, comprising: the powder feeding device comprises a feed bin, a discharge port, an exhaust port and a first air inlet, wherein the feed port of the feed bin is used for inputting powder into the feed bin through compressed air; the first rotary feeder is provided with a feed inlet and a discharge outlet, and the feed inlet of the first rotary feeder is communicated with the discharge outlet of the stock bin; the air extracting chamber is provided with a feed inlet, a discharge outlet, a first air return opening and a second air inlet, and the feed inlet of the air extracting chamber is communicated with the discharge outlet of the first rotary feeder; the second rotary feeder is provided with a feed inlet, a discharge outlet and a second air return opening, and the feed inlet of the second rotary feeder is communicated with the discharge outlet of the extraction chamber; the venturi ejector is provided with a first interface, a second interface and a third interface, the first interface is communicated with the discharge port of the second rotary feeder, and air entering the second interface can accelerate to flow to the third interface; the air inlet end of the conveying air pipe is communicated with an external air source for air supply, and the air outlet end of the conveying air pipe is communicated with the second interface; the feeding end of the ash conveying pipe is communicated with the third interface, and the discharging end of the ash conveying pipe is used for conveying powder to the outside; the air inlet end of the first air return pipe is communicated with the first air return port, and the air outlet end of the first air return pipe is communicated with the first air inlet; the air inlet end of the second air return pipe is communicated with the second air return port, and the air outlet end of the second air return pipe is communicated with the second air inlet; and the air extraction fan drives the air in the first air return pipe and the second air return pipe to flow.

According to some embodiments of the application, the powder conveying device further comprises a filtering device; the filter device is arranged at the exhaust port and comprises a filter element, and the filter element is provided with an attaching surface facing the inside of the storage bin; the powder conveying device further comprises a cleaning piece, and the cleaning piece is used for removing powder on the attachment surface.

According to some embodiments of the application, the powder conveying device further comprises an exhaust fan; the exhaust fan drives air in the storage bin to be exhausted from the exhaust port, and the exhaust quantity of the exhaust port is larger than the air inflow of the feeding port, so that the storage bin is in a negative pressure state.

According to some embodiments of the application, the lower end of the bin comprises a cone pipe section; the taper pipe section is of a structure with a large upper part and a small lower part, and a discharge hole of the storage bin is arranged at the bottom of the taper pipe section; the powder conveying device further comprises a first arch breaking device and a second arch breaking device; the first arch breaking device is arranged on the side wall of the taper pipe section; the second arch breaking device is arranged on the side wall of the extraction chamber.

According to some embodiments of the application, the powder conveying device further comprises a fluidizer; the fluidization gas is arranged on the side wall of the taper pipe section and is positioned above the first arch breaking device.

According to some embodiments of the application, the powder conveying device further comprises a feeding pipe; the feed end of the feed pipe is used for being connected with a tank car with an air compressor, the feed end of the feed pipe is communicated with the feed inlet of the storage bin, and the feed pipe is provided with a feed valve for opening and closing the feed pipe.

According to some embodiments of the application, the powder conveying device further comprises a discharge valve; the discharging valve is used for opening and closing a discharging hole of the storage bin, and the discharging hole of the storage bin, the discharging valve and the first rotary feeder are in butt joint connection into a whole.

According to some embodiments of the application, the ash conveying pipe is provided with a plurality of vibrators which are arranged at intervals.

According to some embodiments of the application, the first rotary feeder is a frequency modulation rotary feeder; the second rotary feeder is a power frequency rotary feeder.

According to some embodiments of the application, the feed inlet, the exhaust outlet and the first air inlet of the bin are all arranged at the top of the bin, and the discharge outlet of the bin is arranged at the bottom of the bin.

As can be seen from the technical scheme, the embodiment of the utility model has at least the following advantages and positive effects:

In the powder conveying device provided by the embodiment of the utility model, the powder is input into the feed bin through the compressed air at the feed inlet of the feed bin, and the compressed air can raise the powder to scatter the powder, so that the fluidity of the powder is improved, and the hardening and bridging of the powder are avoided. The exhaust port discharges air in the feed bin, so that the influence of excessive pressure in the feed bin on the input of powder into the feed inlet is avoided.

The venturi ejector accelerates the air entering the second interface from the conveying air pipe to flow to the third interface, negative pressure is generated at the first interface, the blanking speed of the first interface can be improved, and the device can be suitable for the working condition with smaller conveying amount.

The first rotary feeder and the second rotary feeder play a role in controlling and distributing material flow, in addition, the second rotary feeder can prevent air which is introduced into the venturi ejector by the conveying air pipe from reversely channeling to the extraction chamber, and meanwhile, the second air return pipe can pump out the air reversely channeling to the second rotary feeder to the extraction chamber under the action of the air pumping fan, so that the working stability of the second rotary feeder is ensured. The first muffler can be used for pumping the air reversely flowing into the pumping chamber to the storage bin under the action of the pumping fan, and the air in the part can also be used for lifting the powder to scatter the powder and be discharged from the air outlet.

The first rotary feeder can obstruct air of the extraction chamber from reversely flowing to the discharge port, and the first rotary feeder and the second rotary feeder are respectively positioned at the upstream and the downstream of the extraction chamber to ensure that negative pressure in the extraction chamber is stable to realize extraction. The first rotary feeder and the second rotary feeder are combined with the extraction chamber, so that the influence of reverse channeling of air flow on the discharging stability can be effectively prevented.

The powder enters the Venturi ejector from the second interface, is mixed with air from the first interface, is conveyed to the outside from the third interface, and is conveyed farther under the action of wind power.

Therefore, the powder conveying device can effectively prevent the influence of air flow on the blanking stability, ensure that powder is not hardened without bridging, and have accurate powder conveying measurement, long conveying distance and smaller conveying amount.

Drawings

Various objects, features and advantages of the present utility model will become more apparent from the following detailed description of the preferred embodiments of the utility model, when taken in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the utility model and are not necessarily drawn to scale. In the drawings, like reference numerals refer to the same or similar parts throughout. Wherein:

FIG. 1 is a schematic view showing a connection structure of a powder transporting apparatus according to an embodiment of the present utility model.

The reference numerals are explained as follows:

1. A storage bin;

2. A first rotary feeder;

3. An extraction chamber;

4. a second rotary feeder;

5. a venturi ejector;

6. A conveying air pipe;

7. An ash conveying pipe;

8. A first muffler;

9. A second muffler;

10. A feed pipe;

11. a feed valve;

12. A first arch breaking device;

13. A fluidizer;

14. A discharge valve;

15. a second arch breaking device;

16. and a filtering device.

Detailed Description

While this utility model is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the utility model and is not intended to limit the utility model to that as illustrated.

Thus, rather than implying that each embodiment of the present utility model must have the characteristics described, one of the characteristics indicated in this specification will be used to describe one embodiment of the present utility model. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.

In the embodiments shown in the drawings, indications of orientation (such as up, down, left, right, front and rear) are used to explain the structure and movement of the various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position of these elements changes, the indication of these directions changes accordingly.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating a connection structure of a powder conveying device according to an embodiment of the utility model. The powder conveying device provided by the embodiment of the utility model comprises a storage bin 1, a first rotary feeder 2, an air extracting chamber 3, a second rotary feeder 4, a Venturi ejector 5, a conveying air pipe 6, an ash conveying pipe 7, a first air return pipe 8, a second air return pipe 9 and an air extracting fan.

The feed bin 1 has feed inlet, discharge gate, gas vent and first air inlet, and the feed inlet of feed bin 1 passes through compressed air to the powder of inputing in the feed bin 1.

The first rotary feeder 2 is provided with a feed inlet and a discharge outlet, and the feed inlet of the first rotary feeder 2 is communicated with the discharge outlet of the stock bin 1.

The extraction chamber 3 is provided with a feed inlet, a discharge outlet, a first air return opening and a second air inlet, and the feed inlet of the extraction chamber 3 is communicated with the discharge outlet of the first rotary feeder 2.

The second rotary feeder 4 is provided with a feed inlet, a discharge outlet and a second air return opening, and the feed inlet of the second rotary feeder 4 is communicated with the discharge outlet of the extraction chamber 3.

The venturi injector 5 is provided with a first interface, a second interface and a third interface, wherein the first interface is communicated with the discharge port of the second rotary feeder 4, and air entering the second interface can accelerate to flow to the third interface.

The air inlet end of the conveying air pipe 6 is communicated with an external air source for air supply, and the air outlet end of the conveying air pipe 6 is communicated with a second connector. The external air source can adopt Roots blower to supply air, or compressed air can be used for supplying air after decompression.

The feeding end of the ash conveying pipe 7 is communicated with a third interface, and the discharging end of the ash conveying pipe 7 conveys powder to the outside.

The air inlet end of the first air return pipe 8 is communicated with the first air return port, and the air outlet end of the first air return pipe 8 is communicated with the first air inlet.

The air inlet end of the second air return pipe 9 is communicated with the second air return port, and the air outlet end of the second air return pipe 9 is communicated with the second air inlet.

The air extraction fan drives the air flow in the first air return pipe 8 and the second air return pipe 9.

Through above-mentioned structural design, the feed inlet of feed bin 1 is through the powder of compressed air to feed bin 1 in, and compressed air can raise the powder and make the powder scatter, improves the mobility of powder, avoids powder hardening and bridging. The air in the feed bin 1 is discharged through the air outlet, so that the influence of excessive internal pressure of the feed bin 1 on the powder input of the feed inlet is avoided.

The venturi ejector 5 accelerates the air entering the second interface from the conveying air pipe 6 to flow to the third interface, negative pressure is generated at the first interface, the blanking speed of the first interface can be improved, and the device can be suitable for the working condition with smaller conveying amount.

The first rotary feeder 2 and the second rotary feeder 4 play a role in controlling and distributing material flow, in addition, the second rotary feeder 4 can prevent air which is introduced into the venturi ejector 5 by the conveying air pipe 6 from reversely flowing into the air extracting chamber 3, and meanwhile, the second air return pipe 9 can pump out air reversely flowing into the second rotary feeder 4 to the air extracting chamber 3 under the action of the air extracting fan, so that the working stability of the second rotary feeder 4 is ensured. The first air return pipe 8 can pump the air reversely flowing into the air pumping chamber 3 to the storage bin 1 under the action of the air pumping fan, and the air in the part can also play a role in lifting the powder to scatter the powder and is discharged from the air outlet.

The first rotary feeder 2 can obstruct the air of the extraction chamber 3 from reversely flowing to the discharge port, and the first rotary feeder 2 and the second rotary feeder 4 are respectively positioned at the upstream and the downstream of the extraction chamber 3 to ensure that the negative pressure in the extraction chamber 3 is stable to realize the extraction. The first rotary feeder 2 and the second rotary feeder 4 are combined with the extracting chamber 3, so that the influence of reverse channeling of air flow on the discharging stability can be effectively prevented.

The powder enters the venturi injector 5 from the second interface and then is mixed with air from the first interface, and is conveyed to the outside from the third interface, so that the conveying distance of the powder is longer under the action of wind force.

If the air extracting chamber 3, the first air returning pipe 8 and the second air returning pipe 9 are not provided for air extraction, the powder is pushed upwards by the reverse air, and the discharging is blocked.

The top of feed bin 1 is all located to feed inlet, gas vent and the first air inlet of feed bin 1, and the bottom of feed bin 1 is located to feed bin 1's discharge gate for the flow direction of air current can promote feed bin 1 ejection of compact.

The powder conveying device further comprises a feed pipe 10. The feeding end of the feeding pipe 10 is used for connecting a tank car with an air compressor, compressed air is generated by the air compressor of the tank car automatically to drive powder into the storage bin 1, and the feeding speed is improved. The feed end of the feed pipe 10 is communicated with the feed inlet of the stock bin 1, and a feed valve 11 for opening and closing the feed pipe 10 is arranged on the feed pipe 10.

The powder conveying device further comprises a filtering device 16, the filtering device 16 is arranged at the exhaust port, and the filtering device 16 is used for filtering powder and avoiding dust from overflowing and polluting the environment.

The filter device 16 comprises a filter cartridge with an attachment surface facing the interior of the cartridge 1. The powder conveying device further comprises a cleaning piece, wherein the cleaning piece is used for removing powder on the attachment surface, and the filtering effect of the filter element is guaranteed. The cleaning piece can be a blowing pipe, and powder on the attachment surface is blown off by blowing through the blowing pipe. The cleaning piece can also be a brush, and the powder on the attachment surface is cleaned by the brush. The cleaning member can be opened periodically to remove the powder. The filter device 16 may be a filter device 16 with an air extraction fan built in.

The powder conveying device also comprises an exhaust fan. The exhaust fan drives the air in the feed bin 1 to be discharged from the exhaust port, and the exhaust speed of the exhaust port can be accelerated by utilizing the exhaust fan, so that the device can adapt to larger compressed air to input powder into the powder from the feed inlet of the feed bin 1, so as to keep the air pressure in the feed bin 1 constant and prevent the powder from being exploded, and the larger compressed air is more beneficial to raising the powder to scatter the powder, improve the fluidity of the powder and avoid hardening and bridging of the powder. And then the exhaust air quantity of the exhaust port is larger than the air inflow of the feeding port through the exhaust fan, so that the inside of the storage bin 1 is in a negative pressure state. The feed bin 1 in the negative pressure state is not only beneficial to the powder input of the feed inlet of the feed bin 1, but also beneficial to the air input of the first air return pipe 8 to the feed bin 1 from the air inlet of the feed bin 1 of the air extracting chamber 3.

The air extraction fan and the air exhaust fan can be a ventilator, a blower, a compressor or an air extraction pump.

The lower extreme of feed bin 1 includes the taper pipe section, and the taper pipe section is big-end-up's structure, and the bottom of taper pipe section is located to the discharge gate of feed bin 1. The cone pipe section concentrates the powder at the lower end of the storage bin 1 to the discharge port of the storage bin 1 for discharging. The powder conveying device further comprises a first arch breaking device 12, the first arch breaking device 12 is arranged on the side wall of the taper pipe section, and the first arch breaking device 12 breaks up powder which is easy to bridge on the taper pipe section, so that the flowability of the powder is ensured. The first arch breaking means 12 is a plurality of circumferentially spaced apart around the cone pipe section. In this embodiment, the upper end of the bin 1 includes a straight pipe section, the straight pipe section is in a structure with equal diameters from top to bottom, and the taper pipe section is connected above the straight pipe section. The feed inlet, the exhaust port and the first air inlet of the storage bin 1 are arranged at the top of the straight pipe section.

The powder conveying device further comprises a fluidizer 13. The fluidizing gas is provided on the side wall of the cone pipe section and above the first arch breaking device 12. The fluidizer 13 fluidizes the powder periodically to improve the fluidity of the powder. The fluidizer 13 may be a gas tray fluidizer 13.

The powder conveying device further comprises a weighing sensor element for weighing the weight of the silo 1. The change of the weight of the storage bin 1 is obtained in real time by utilizing the weighing sensing element, so that the powder filling is conveniently and timely reminded or stopped. In the embodiment, the stock bin 1 is erected on a bracket, and the weighing sensor element is arranged at the joint of the bottom of the straight pipe section and the bracket.

The powder delivery device further comprises a discharge valve 14. The discharge valve 14 is used for opening and closing the discharge hole of the storage bin 1, and the discharge hole of the storage bin 1, the discharge valve 14 and the first rotary feeder 2 are in butt joint connection into a whole. That is, the discharge port of the bin 1, the discharge valve 14 and the first rotary feeder 2 are directly connected, so that the first arch breaking device 12 near the discharge port of the bin 1 can break the arch at a position above the inlet of the first rotary feeder 2, avoiding powder piling up the arch at a position above the inlet of the first rotary feeder 2. The outfeed valve 14 may be a gate valve. In other embodiments, the feed inlet of the first rotary feeder 2 may also be connected to the discharge outlet of the silo 1 via a pipe.

In this embodiment, the first rotary feeder 2, the air extracting chamber 3, the second rotary feeder 4 and the venturi injector 5 are in butt joint, that is, the discharge valve 14 below the storage bin 1 is in direct butt joint with the first rotary feeder 2, the air extracting chamber 3, the second rotary feeder 4 and the venturi injector 5, instead of communicating through a pipeline, so that the whole height of the powder conveying device is lower, maintenance is more facilitated, and overhaul and replacement are convenient.

The first rotary feeder 2 is a frequency modulation rotary feeder which can control the flow rate of the powder by changing the frequency. The second rotary feeder 4 is a power frequency rotary feeder, and the frequency set by the power frequency rotary feeder is greater than or equal to the maximum adjustable frequency of the frequency modulation rotary feeder, so that the maximum flow rate of the powder controlled by the frequency modulation rotary feeder can be ensured to be controlled by the power frequency rotary feeder. The industrial frequency rotary feeder has the advantage of lower cost than the frequency modulation rotary feeder.

It should be noted that, because the frequency modulation rotary feeder needs to adjust the flow rate of the powder, a powder stacking arch may be generated above the inlet of the frequency modulation rotary feeder when the flow rate of the powder is adjusted to be small, and the first arch breaking device 12 may break the arch at the position above the inlet of the frequency modulation rotary feeder through the design that the discharge port of the storage bin 1, the discharge valve 14 and the first rotary feeder 2 are connected in a butt joint manner. The industrial frequency rotary feeder can work at a frequency with larger powder flow, so that powder can smoothly pass through the industrial frequency rotary feeder, and the arch at the position above the inlet of the industrial frequency rotary feeder is avoided.

The powder conveying device further comprises a second arch breaking device 15, the second arch breaking device 15 is arranged on the side wall of the extraction chamber 3, and the second arch breaking device 15 breaks up bridging powder in the extraction chamber 3 to ensure the fluidity of the powder. The second arch breaking devices 15 are circumferentially arranged at intervals around the pumping chamber 3.

The ash conveying pipe 7 is provided with a plurality of vibrators which are arranged at intervals, so that the problem that ash is adhered to the ash conveying pipe 7 is effectively solved.

While the utility model has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present utility model may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A powder delivery device, comprising:

The powder feeding device comprises a feed bin, a discharge port, an exhaust port and a first air inlet, wherein the feed port of the feed bin is used for inputting powder into the feed bin through compressed air;

The first rotary feeder is provided with a feed inlet and a discharge outlet, and the feed inlet of the first rotary feeder is communicated with the discharge outlet of the stock bin;

The air extracting chamber is provided with a feed inlet, a discharge outlet, a first air return opening and a second air inlet, and the feed inlet of the air extracting chamber is communicated with the discharge outlet of the first rotary feeder;

The second rotary feeder is provided with a feed inlet, a discharge outlet and a second air return opening, and the feed inlet of the second rotary feeder is communicated with the discharge outlet of the extraction chamber;

The venturi ejector is provided with a first interface, a second interface and a third interface, the first interface is communicated with the discharge port of the second rotary feeder, and air entering the second interface can accelerate to flow to the third interface;

the air inlet end of the conveying air pipe is communicated with an external air source for air supply, and the air outlet end of the conveying air pipe is communicated with the second interface;

the feeding end of the ash conveying pipe is communicated with the third interface, and the discharging end of the ash conveying pipe is used for conveying powder to the outside;

The air inlet end of the first air return pipe is communicated with the first air return port, and the air outlet end of the first air return pipe is communicated with the first air inlet;

the air inlet end of the second air return pipe is communicated with the second air return port, and the air outlet end of the second air return pipe is communicated with the second air inlet;

and the air extraction fan drives the air in the first air return pipe and the second air return pipe to flow.

2. The powder delivery device of claim 1, further comprising a filter device;

The filter device is arranged at the exhaust port and comprises a filter element, and the filter element is provided with an attaching surface facing the inside of the storage bin;

the powder conveying device further comprises a cleaning piece, and the cleaning piece is used for removing powder on the attachment surface.

3. The powder delivery device of claim 1, further comprising an exhaust fan;

The exhaust fan drives air in the storage bin to be exhausted from the exhaust port, and the exhaust quantity of the exhaust port is larger than the air inflow of the feeding port, so that the storage bin is in a negative pressure state.

4. The powder delivery device of claim 1, wherein the lower end of the bin comprises a cone tube section;

the taper pipe section is of a structure with a large upper part and a small lower part, and a discharge hole of the storage bin is arranged at the bottom of the taper pipe section;

the powder conveying device further comprises a first arch breaking device and a second arch breaking device;

The first arch breaking device is arranged on the side wall of the taper pipe section;

the second arch breaking device is arranged on the side wall of the extraction chamber.

5. The powder delivery device of claim 4, further comprising a fluidizer;

the fluidization gas is arranged on the side wall of the taper pipe section and is positioned above the first arch breaking device.

6. The powder delivery device of claim 1, further comprising a feed tube;

The feed end of the feed pipe is used for being connected with a tank car with an air compressor, the feed end of the feed pipe is communicated with the feed inlet of the storage bin, and the feed pipe is provided with a feed valve for opening and closing the feed pipe.

7. The powder delivery device of claim 1, further comprising an outlet valve;

The discharging valve is used for opening and closing a discharging hole of the storage bin, and the discharging hole of the storage bin, the discharging valve and the first rotary feeder are in butt joint connection into a whole.

8. The powder conveying device according to claim 1, wherein a plurality of vibrators are arranged at intervals on the ash conveying pipe.

9. The powder delivery device of claim 1, wherein the first rotary feeder is a frequency modulated rotary feeder;

the second rotary feeder is a power frequency rotary feeder.

10. The powder delivery device of claim 1, wherein the feed inlet, the exhaust outlet, and the first air inlet of the bin are all disposed at the top of the bin, and the discharge outlet of the bin is disposed at the bottom of the bin.