CN221700372U - A high-pressure pneumatic conveying device for biomass powder - Google Patents

Abstract

The utility model relates to the field of biomass pyrolysis gasification, and provides a high-pressure pneumatic conveying device for biomass powder, which is used for conveying the biomass powder into a gasification reactor, so that bridging of the biomass powder in a feed tank is reduced or avoided under the condition that no additional fluidizing gas is introduced. The device comprises more than two feeding tanks for conveying biomass powder into a gasification reactor arranged below; the feeding tank is provided with a biomass powder inlet, a quantitative feeding device is arranged in the inner cavity of the feeding tank, and the quantitative feeding device is arranged at the discharge end of the feeding tank; the outlet of the quantitative feeding device is connected with the gasification reactor through a discharge pipeline, and the inlet of the discharge pipeline is higher than the outlet of the discharge pipeline; the feeding tank is also provided with an anti-bridging feeding mechanism which can mechanically move in the inner cavity of the feeding tank to dredge biomass powder in the feeding tank.

Description

High-pressure pneumatic conveying device for biomass powder

Technical Field

The utility model relates to the field of biomass pyrolysis gasification, in particular to a biomass powder high-pressure pneumatic conveying device.

Background

Biomass is used as an energy source for converting solar energy into chemical energy for storage, and has the advantages of being renewable, free of pollution, wide in distribution and the like, and biomass gasification technology can convert biomass into synthesis gas mainly comprising carbon monoxide and hydrogen in a high-temperature and high-pressure environment in a gasification furnace, so that the biomass gasification technology is one of the best technologies for utilizing biomass energy. At present, how to convey biomass into a high-pressure gasification furnace is a great difficulty in restricting the development of biomass gasification technology.

Pneumatic conveying has compact structure, convenient operation, safety, reliability and other characteristics, and is widely applied to materials with good fluidity such as coal dust, grains and the like at present, but the current pneumatic conveying technology is difficult to be used for conveying biomass powder due to the characteristics of low density, poor fluidity, easy bridging, low heat value and the like of biomass powder:

firstly, most of the conventional coal dust pneumatic conveying devices are lower than the arrangement of a gasification furnace, and materials leave a feeding tank and enter a section of parallel pipeline uplink vertical pipeline, so that more carrier gas is needed. The conventional carrier gas is generally inert gas, however, because the heat value of biomass is lower than that of coal, and the heat value difference between biomasses is very large, the solid-gas ratio of the biomass should be improved as high as possible in the pneumatic conveying process, and if the biomass is still conveyed upwards by adopting a vertical pipe, more carrier gas needs to be used, so that more inert gas enters the gasification reactor, the temperature of the gasification reactor is difficult to rise, and the gasification efficiency is reduced.

Secondly, in the current pneumatic conveying technology, fluidizing air is mostly introduced into a feeding tank, and the technology can obviously improve the fluidity of materials with regular particles such as coal dust and high density, but because the particles are mostly flaky after biomass pulverization, the density is lower, the falling speed and the influence of air resistance are difficult to calculate under the action of the fluidizing air, if the lower fluidizing air speed is used, the materials are easy to accumulate at the bottom, sand dune flows are easy to form in the feeding, and the feeding fluctuation is larger; if a higher fluidization gas velocity is adopted, the solid-gas ratio is reduced, so that a large amount of inert gas enters the gasification furnace, and the furnace temperature is difficult to increase, and therefore, the operation difficulty is increased by using the fluidization gas in the biomass feed tank, and the stable operation of the gasification device is not facilitated.

Finally, even the current mature pulverized coal conveying technology is difficult to realize accurate operation and metering of materials, and the biomass is extremely high in volatile matter, and the biomass enters the gasification reactor to be rapidly combusted, so that ensuring accurate metering of the feed is important for safe and stable operation of the biomass gasification furnace. While the current art employs rotary valves to achieve dosing, rotary valves act as a motive device, and the current art has difficulty achieving high pressure seals and therefore is difficult to apply to the feed system of a high pressure gasifier.

Disclosure of utility model

The utility model provides a high-pressure pneumatic conveying device for biomass powder, which is used for conveying the biomass powder into a gasification reactor, so that bridging of the biomass powder in a feed tank is reduced or avoided under the condition that no additional fluidizing gas is introduced, and the operation difficulty is reduced; meanwhile, the quantitative feeding device is arranged in the feeding tank, so that the quantitative feeding device is unpressurized, and the problem that the quantitative feeding device is difficult to seal in a high-pressure environment existing in the traditional technology that the quantitative feeding device is arranged outside the feeding tank is solved.

The utility model provides the following technical scheme for achieving the purpose:

the utility model provides a biomass powder high-pressure pneumatic conveying device, which comprises more than two feeding tanks, wherein the two feeding tanks are used for conveying biomass powder into a gasification reactor arranged below;

The feeding tank is provided with a biomass powder inlet, a quantitative feeding device is arranged in the inner cavity of the feeding tank, and the quantitative feeding device is arranged at the discharge end of the feeding tank; the outlet of the quantitative feeding device is connected with the gasification reactor through a discharge pipeline, and the inlet of the discharge pipeline is higher than the outlet of the discharge pipeline; the feeding tank is also provided with an anti-bridging feeding mechanism which can mechanically move in the inner cavity of the feeding tank to dredge biomass powder in the feeding tank.

Preferably, the angle between the discharge line and the horizontal line is between 45 ° and 90 °.

Further, the bridging-preventing feeding mechanism is a spiral feeder acting on the biomass powder in the feeding tank, or a scraper capable of scraping the biomass powder attached to the inner wall of the feeding tank, or a piston push rod device capable of pushing the biomass powder in the feeding tank;

the feed tank is provided with one or at least two of the screw feeder, the rake or the piston push rod device.

In some embodiments, the screw feeder comprises a screw extending into the interior cavity of the feed tank and arranged in the axial direction of the feed tank, and a screw drive for driving the screw in rotation;

Or the raking device comprises a connecting rod extending into the inner cavity of the feeding tank, a plurality of scraping blades arranged on the connecting rod and used for scraping biomass powder attached to the inner wall of the feeding tank, and a connecting rod driving device capable of driving the connecting rod to move up and down relative to the feeding tank;

or the piston push rod device comprises a piston sleeve, a push rod arranged in the piston sleeve and a push rod driving device used for driving the push rod to reciprocate back and forth in the piston sleeve, the piston sleeve is arranged outside the feeding tank, a push rod inlet for the push rod to extend in is formed in the side wall of the feeding tank, and the push rod can extend into the inner cavity of the feeding tank from the push rod inlet under the action of the push rod driving device.

In some preferred embodiments, the screw is disposed along a central axis of the feed tank;

Or the push rod is obliquely arranged relative to the axial direction of the feeding tank, and the free end of the push rod faces to the lower part or the bottom of the feeding tank;

Or the feeding tank is provided with a plurality of piston push rod devices;

or the feed tank is provided with a plurality of rakes.

Further, the dosing device is provided with a pressure balancing device for balancing the pressure of the inlet and outlet of the dosing device;

The biomass powder high-pressure pneumatic conveying device further comprises a pressure adjusting device capable of pressurizing the feeding tank, and the feeding tank is connected with the pressure adjusting device through a pipeline;

The biomass powder high-pressure pneumatic conveying device further comprises a carrier gas tank, and a carrier gas outlet of the carrier gas tank is connected with the discharging pipeline.

Further, a flow regulating valve and a cut-off valve are arranged on the discharging pipeline;

the feeding tank is provided with a material level detection device for detecting the material level in the feeding tank;

The dosing device is connected with a dosing device driving motor for driving the dosing device to work.

Preferably, the biomass powder high-pressure pneumatic conveying device further comprises a controller;

The controller is respectively in communication connection with the material level detection device and the driving motor of each quantitative feeding device, which are correspondingly arranged on each feeding tank, and is also respectively in communication connection with the flow regulating valve and the cut-off valve on the discharging pipeline, which are connected with each feeding tank.

Further, a pressure relief opening is formed in the feeding tank;

a pressure equalizing pipeline is also connected between the discharge end of the feeding tank and the upper part of the feeding tank;

The gasification reactor is a gasification furnace;

the dosing device is a rotary valve or a star feeder.

Further, the discharge line does not include a horizontal line or an up line.

The technical scheme provided by the utility model has the following beneficial effects:

1) According to the biomass powder high-pressure pneumatic conveying device, the feeding tank is arranged above the gasification reactor, so that biomass materials can enter the gasification reactor from top to bottom by means of self gravity, and the fluidity of the biomass materials in a pipeline can be ensured by only a small amount of carrier gas. 2) The fluidized gas is not used in the feeding tank, but the bridging-preventing feeding mechanism is adopted, and the biomass powder is disturbed and dredged through the mechanical movement of the bridging-preventing feeding mechanism in the inner cavity of the feeding tank, so that bridging of the biomass material in the feeding tank is avoided, the risk of bridging of the material is avoided, and the operation difficulty is reduced. 3) According to the utility model, the quantitative feeding device is arranged in the feeding tank, so that the quantitative feeding device is unpressurized, and the problem that the quantitative feeding device is difficult to seal in a high-pressure environment can be avoided.

Drawings

FIG. 1 is a schematic diagram of a biomass powder high pressure pneumatic conveying apparatus in one embodiment;

FIG. 2 is a schematic diagram of a biomass powder high pressure pneumatic conveying apparatus in another embodiment;

FIG. 3 is a schematic diagram of a biomass powder high pressure pneumatic conveying apparatus in another embodiment;

fig. 4 is a schematic diagram of a biomass powder high-pressure pneumatic conveying device in another embodiment.

Reference numerals illustrate: 1-feeding tank, 2-screw feeder, 21-screw, 22-screw driving device, 3-harrow, 31-doctor blade, 32-connecting rod, 33-connecting rod driving device, 4-piston push rod device, 41-piston sleeve, 42-push rod, 43-push rod driving device, 5-dosing device, 51-dosing device driving motor, 52-pressure balancing device, 7-material level detecting device, 8-discharge pipeline, 9-flow regulating valve, 10-cut-off valve, 11-carrier gas tank, 12-pressure relief port, 13-pressure regulating device, 14-equalizing pipeline, 15-biomass powder inlet, 16-gasification reactor and 17-discharge end.

Detailed Description

In order that the utility model may be readily understood, a further description of the utility model will be provided with reference to the following examples. It should be understood that the following examples are only for better understanding of the present utility model and are not meant to limit the present utility model to the following examples.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The term "and/or" as may be used herein includes any and all combinations of one or more of the associated listed items.

Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible to be mentioned in the present specification are defined with respect to the configurations shown in the drawings, which are relative concepts, and thus may be changed according to different positions and different use states thereof. The words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

The utility model provides a biomass powder high-pressure pneumatic conveying device, which is shown in fig. 1, and comprises more than two feeding tanks 1, wherein the feeding tanks 1 are arranged above a gasification reactor 16, and the feeding tanks 1 are used for conveying biomass powder to the gasification reactor 16 below the feeding tanks. Each feed tank 1 is provided with a biomass powder inlet 15, a quantitative feeding device 5 is arranged in the inner cavity of the feed tank 1, specifically, the quantitative feeding device 5 is arranged at a discharge end 17 of the feed tank 1, and biomass powder is quantitatively output outwards through the quantitative feeding device 5; the dosing device 5 may be a device with a corresponding function as is conventional in the art, such as a rotary valve or a star feeder. The inlet of the dosing device 5 is used for receiving the biomass powder in the inner cavity of the feeding tank 1, and the outlet of the dosing device 5 is used for outputting the biomass powder. The outlet of the dosing device 5 is connected via a discharge line 8 to a gasification reactor 16 below. The inlet of the discharge line 8 is higher than the outlet of the discharge line 8. Preferably, the discharge line 8 does not comprise a horizontal line and an up line. After entering the discharging pipeline 8, the biomass powder is not horizontally conveyed or is not conveyed upwards. The feeding tank 1 is further provided with an anti-bridging feeding mechanism capable of mechanically moving in the inner cavity of the feeding tank 1 to dredge biomass powder in the feeding tank 1, namely, the anti-bridging feeding mechanism mechanically moves in the inner cavity of the feeding tank 1 to disturb and dredge the biomass powder, so that bridging is avoided or reduced.

In some preferred embodiments, the angle between the discharge line 8 and the horizontal is between 45 ° and 90 °, as shown in fig. 1.

In particular, referring to fig. 1-4, the bridge-proof feeding mechanism is a screw feeder 2 acting on the biomass powder in the feed tank 1, or a scraper 3 capable of scraping the biomass powder attached to the inner wall of the feed tank 1, or a piston pusher device 4 capable of pushing the biomass powder in the feed tank 1. The feed tank 1 may be provided with one or at least two of a screw feeder 2, a rake 3 or a piston pusher device 4. By way of example, in the embodiment shown in fig. 1, the feed tank 1 is provided with only screw feeders 2; in the embodiment shown in fig. 2, the feed tank 1 is provided with only a rake 3; in the embodiment shown in fig. 3, the feed tank 1 is provided with only a piston pusher device 4; in the embodiment shown in fig. 4, one of the feed tanks 1 is provided with both a screw feeder 2 and a piston pusher device 4, and the other feed tank 1 is provided with both a screw feeder 2 and a rake 3.

Specifically, as shown in fig. 1, the screw feeder 2 includes a screw 21 and a screw driving device 22 for driving the screw 21 to rotate, and the screw 21 protrudes into the inner cavity of the feed tank 1 and is arranged in the axial direction of the feed tank 1. The screw feeder 2 may specifically be a screw feeder with a corresponding function as is conventional in the art, and will not be further described. The screw 21 is driven to rotate by the screw driving device 22, and the screw 21 can disturb and dredge biomass powder in the inner cavity of the feeding tank 1 in the rotating process, so that bridging phenomenon is avoided. The screw drive 22 is, for example, a motor.

Specifically, as shown in fig. 2, the rake 3 includes a connecting rod 32 extending into the inner cavity of the feed tank 1, a plurality of scraping blades 31 and a connecting rod driving device 33, the connecting rod driving device 33 is used for driving the connecting rod 32 to move up and down relative to the feed tank 1, the plurality of scraping blades 31 are arranged on the connecting rod 32 and are close to the inner wall of the feed tank 1, when the scraping blades 31 move up and down along with the connecting rod 32, biomass powder attached to the inner wall of the feed tank 1 can be scraped, the biomass powder is scraped, and the phenomenon of wall attaching and bridging caused by the attachment of the biomass powder is reduced. The link driving means 33 may employ an existing driving means which is conventional in the art and can achieve the up-and-down movement of the driving link 32, for example, by motor driving or by hydraulic means, etc.

Specifically, as shown in the schematic view of fig. 3, the piston rod device 4 includes a piston sleeve 41, a rod 42 provided in the piston sleeve 41, and a rod drive device 43 for driving the rod 42 to reciprocate back and forth in the piston sleeve 41. The piston sleeve 41 is arranged outside the feeding tank 1, a push rod inlet into which the push rod 42 extends is formed in the side wall of the feeding tank 1, the push rod 42 reciprocates back and forth in the piston sleeve 41 under the action of the push rod driving device 43, and can enter the push rod inlet in the movement process and extend into the inner cavity of the feeding tank 1, and the push rod 42 can play a role of disturbing or pushing biomass powder in the feeding tank 1 in the back and forth reciprocation process, so that bridging phenomenon is reduced or avoided. The push rod driving device 43 may employ an existing driving device which is conventional in the art and can realize the forward and backward reciprocating motion of the push rod 42, for example, driving by a motor or driving by a hydraulic device, etc.

Preferably, as shown in fig. 1, when the screw feeder 2 is provided on the feed tank 1, the screw 21 of the screw feeder 2 is preferably arranged along the central axis of the feed tank 1, so that better bridging prevention effect is obtained.

Preferably, as shown in fig. 3, when the feed tank 1 is provided with the piston push rod device 4, the push rod 42 is preferably arranged obliquely relative to the axial direction of the feed tank 1, and the free end of the push rod 42 faces the lower part or the bottom of the feed tank 1, so that better bridging prevention effect is obtained. Preferably, the feed tank 1 is provided with a plurality of piston rod assemblies 4 at the same time, the plurality of piston rod assemblies 4 being arranged, for example, at intervals above each other or symmetrically or circumferentially with each other.

Preferably, as shown in fig. 2, when the rake 3 is provided in the feed tank 1, a plurality of rakes 3 are preferably provided, so as to obtain a better bridging prevention effect.

In the utility model, the quantitative feeding device 5 is arranged in the inner cavity of the feeding tank 1, so that the feeding tank is unnecessary to bear pressure, and the high-pressure quantitative feeding of biomass powder is facilitated. Further, the dosing device 5 is provided with pressure balancing means 52 for balancing the pressure of the inlet and outlet of the dosing device 5 such that the inlet and outlet pressures of the dosing device 5 are identical, pressure balancing may be achieved with pressure balancing means 52 as is usual in the art, e.g. the pressure balancing means 52 comprises a gas-permeable line providing a gas flow conduit for the inlet and outlet of the dosing device 5, which pressure balancing may be achieved when a blockage of the dosing device 5 occurs, avoiding equipment damage caused by the blockage.

Further, the high-pressure pneumatic conveying device for biomass powder disclosed by the utility model further comprises a pressure regulating device 13, wherein the feed tank 1 is connected with the pressure regulating device 13 through a pipeline, and when the feed tank 1 needs to be pressurized, the pressure regulating device 13 can be used for pressurizing the feed tank 1. The high-pressure pneumatic conveying device for biomass powder further comprises a carrier gas tank 11, and a carrier gas outlet of the carrier gas tank 11 is connected with the discharge pipeline 8, so that carrier gas can be introduced into the discharge pipeline 8.

Further, a flow regulating valve 9 and a shut-off valve 10 are arranged on the discharge pipeline 8; the feed tank 1 is provided with a level detection device 7 for detecting the level of the material in the feed tank 1; the dosing device 5 is connected to a dosing device drive motor 51, by means of which dosing device drive motor 51 the dosing device 5 is driven to operate. The dosing device 5 is a conventional dosing device such as a rotary valve or a star feeder, for example, and the amount of the dosing device 5 can be adjusted by adjusting the speed of the rotation of the dosing device driving motor 51, and the higher the rotation speed, the larger the amount of the feed. Preferably, the biomass powder high-pressure pneumatic conveying device of the utility model further comprises a controller (not shown in the figure); the controller is respectively in communication connection with a material level detection device 7 and a constant feeding device driving motor 51 which are correspondingly arranged on each feeding tank 1, and is also respectively in communication connection with a flow regulating valve 9 and a cut-off valve 10 on a discharge pipeline 8 connected with each feeding tank 1, so that interlocking control is realized among the elements. In the working process of the biomass powder high-pressure pneumatic conveying device, taking the biomass powder high-pressure pneumatic conveying device as an example, referring to fig. 1, the biomass powder high-pressure pneumatic conveying device comprises two feeding tanks 1, for example, a feeding tank A and a feeding tank B, when the feeding tank A is in a working stage of feeding materials to a gasification reactor 16, a controller judges whether the material level of the feeding tank A reaches a preset material level lower limit according to material level information output by a material level detection device 7 of the feeding tank A, if the material level reaches the preset material level lower limit, the controller controls a constant feeding device driving motor 51 of the feeding tank B to be started, simultaneously opens a cut-off valve 10 on a discharge pipeline 8 connected with the feeding tank B, gradually adjusts the opening of a flow regulating valve 9 on the discharge pipeline 8 connected with the feeding tank B from 0% to 100%, and finally switches to the feeding tank B to enter the working stage of feeding materials to the gasification reactor 16; simultaneously, controlling a constant feeding device driving motor 51 of the feeding tank A to be closed, simultaneously closing a cut-off valve 10 on a discharging pipeline 8 connected with the feeding tank A, and gradually adjusting the opening of a flow regulating valve 9 on the discharging pipeline 8 connected with the feeding tank A to 0%; this allows for cyclic alternating operation between the multiple feed tanks, with one feed tank starting when the level of the other feed tank is low.

Further, a pressure relief port 12 is provided on the feed tank 1. A pressure equalizing pipeline 14 is also connected between the discharge end 17 of the feed tank 1 and the upper part of the feed tank 1, so as to avoid that the pressure difference between the discharge end 17 of the feed tank 1 and the upper part of the feed tank 1 is too high to cause that biomass powder is compacted or cannot be discharged in the feed tank 1.

Unless otherwise specified, each device and/or element and the like involved in the biomass powder high-pressure pneumatic conveying device can adopt the conventional device or element with corresponding functions in the field, and the detailed description is omitted.

The biomass powder high-pressure pneumatic conveying device provided by the utility model has the following advantages: 1) The feeding tank is arranged above the gasification reactor, so that biomass materials can enter the gasification reactor from top to bottom by means of self gravity, the mobility of the biomass materials in a pipeline can be ensured by only a small amount of carrier gas, dense phase conveying can be ensured, the solid-gas ratio can be improved, and the temperature of the gasification furnace can be maintained. 2) The fluidized gas is not used in the feeding tank, but the bridging-preventing feeding mechanism is adopted, and the biomass powder is disturbed and dredged through the mechanical movement of the bridging-preventing feeding mechanism in the inner cavity of the feeding tank, so that bridging of the biomass material in the feeding tank is avoided, the risk of bridging of the material is avoided, and the operation difficulty is reduced. 3) According to the utility model, the quantitative feeding device is arranged in the feeding tank, so that the quantitative feeding device is not pressurized, the problem that the movable equipment is difficult to seal in a high-pressure environment is solved, and the high-pressure quantitative conveying of biomass materials can be realized.

In order to facilitate better understanding of the technical solution of the present utility model, the following description will be given by way of example of the working process of biomass powder conveying by using the high-pressure pneumatic conveying device for biomass powder according to the present utility model, but it should not be understood that the present utility model is limited thereto:

Taking fig. 1 as an example, the biomass powder high-pressure pneumatic conveying device is provided with a feeding tank A and a feeding tank B. When the feed tank A is in a normal pressure state, biomass powder enters the feed tank A from the biomass powder inlet 15, and when the material level of the feed tank A is enough, the material level detection device 7 stops feeding. The feed tank a enters a pressurizing stage, and is pressurized by a pressure regulating device 13 to ensure that the pressure of the feed tank a is slightly higher than the pressure of the gasification reactor 16. After the biomass powder enters the feeding tank A, bridging risks can exist, and the biomass powder in the feeding tank A is disturbed and dredged through the bridging-preventing feeding mechanism so as to avoid bridging. The biomass powder is fed through the dosing device 5 and carried in the discharge line 8 by the carrier gas from the carrier gas tank 11 into the gasification reactor 16. The material level detection device 7 detects the material level of the feeding tank A, the controller judges whether the material level of the feeding tank A reaches a preset material level lower limit according to the material level information output by the material level detection device 7 of the feeding tank A, if the material level reaches the preset material level lower limit, the controller controls the constant feeding device driving motor 51 of the feeding tank B to be started, simultaneously opens the cut-off valve 10 on the discharging pipeline 8 connected with the feeding tank B, gradually adjusts the opening of the flow regulating valve 9 on the discharging pipeline 8 connected with the feeding tank B from 0% to 100%, and finally switches to the feeding tank B to enter the working stage of feeding the gasification reactor 16; at the same time, the dosing device driving motor 51 of the feed tank a is controlled to be turned off, and simultaneously, the shut-off valve 10 on the discharge line 8 connected to the feed tank a is turned off, and the opening of the flow regulating valve 9 on the discharge line 8 connected to the feed tank a is gradually adjusted to 0%. After the pressure release is completed, the feeding tank A is fed by the biomass powder inlet 15. And when the material level of the feed tank B reaches the lower limit of the material level, the steps are circulated, and the feed tank A is used for feeding. After the feeding tank A is completely switched to be fed, the feeding tank B is depressurized to normal pressure through a pressure relief opening 12 on the feeding tank B, after the pressure relief is finished, the biomass powder inlet 15 finishes feeding the feeding tank B, and when the material level of the material level detection device 7 of the feeding tank B is enough, the feeding is stopped for later use. The circulation operation realizes the alternate feeding of the two feeding tanks.

It will be readily appreciated that the above embodiments are merely examples given for clarity of illustration and are not meant to limit the utility model thereto. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (10)

1. A biomass powder high-pressure pneumatic conveying device, which is characterized by comprising more than two feeding tanks for conveying biomass powder into a gasification reactor arranged below;

The feeding tank is provided with a biomass powder inlet, a quantitative feeding device is arranged in the inner cavity of the feeding tank, and the quantitative feeding device is arranged at the discharge end of the feeding tank; the outlet of the quantitative feeding device is connected with the gasification reactor through a discharge pipeline, and the inlet of the discharge pipeline is higher than the outlet of the discharge pipeline; the feeding tank is also provided with an anti-bridging feeding mechanism which can mechanically move in the inner cavity of the feeding tank to dredge biomass powder in the feeding tank.

2. The biomass powder high pressure pneumatic conveying apparatus according to claim 1, wherein the angle between the discharge line and the horizontal line is between 45 ° and 90 °.

3. The biomass powder high-pressure pneumatic conveying device according to claim 1, wherein the bridge-prevention feeding mechanism is a screw feeder acting on biomass powder in the feeding tank, or a scraper capable of scraping the biomass powder attached to the inner wall of the feeding tank, or a piston push rod device capable of pushing the biomass powder in the feeding tank;

the feed tank is provided with one or at least two of the screw feeder, the rake or the piston push rod device.

4. A biomass powder high pressure pneumatic conveying apparatus according to claim 3, wherein said screw feeder comprises a screw and a screw drive for driving said screw in rotation, said screw extending into an interior cavity of said feed tank and being axially disposed in said feed tank;

Or the raking device comprises a connecting rod extending into the inner cavity of the feeding tank, a plurality of scraping blades arranged on the connecting rod and used for scraping biomass powder attached to the inner wall of the feeding tank, and a connecting rod driving device capable of driving the connecting rod to move up and down relative to the feeding tank;

or the piston push rod device comprises a piston sleeve, a push rod arranged in the piston sleeve and a push rod driving device used for driving the push rod to reciprocate back and forth in the piston sleeve, the piston sleeve is arranged outside the feeding tank, a push rod inlet for the push rod to extend in is formed in the side wall of the feeding tank, and the push rod can extend into the inner cavity of the feeding tank from the push rod inlet under the action of the push rod driving device.

5. The biomass powder high pressure pneumatic conveying apparatus according to claim 4, wherein said screw is disposed along a central axis of said feed tank;

Or the push rod is obliquely arranged relative to the axial direction of the feeding tank, and the free end of the push rod faces to the lower part or the bottom of the feeding tank;

Or the feeding tank is provided with a plurality of piston push rod devices;

or the feed tank is provided with a plurality of rakes.

6. The biomass powder high pressure pneumatic conveying apparatus according to any one of claims 1 to 5, wherein the dosing device is provided with a pressure balancing device for balancing the pressure of the inlet and outlet of the dosing device;

The biomass powder high-pressure pneumatic conveying device further comprises a pressure adjusting device capable of pressurizing the feeding tank, and the feeding tank is connected with the pressure adjusting device through a pipeline;

The biomass powder high-pressure pneumatic conveying device further comprises a carrier gas tank, and a carrier gas outlet of the carrier gas tank is connected with the discharging pipeline.

7. The biomass powder high-pressure pneumatic conveying device according to any one of claims 1 to 5, wherein a flow regulating valve and a cut-off valve are arranged on the discharging pipeline;

the feeding tank is provided with a material level detection device for detecting the material level in the feeding tank;

The dosing device is connected with a dosing device driving motor for driving the dosing device to work.

8. The biomass powder high pressure pneumatic conveying apparatus according to claim 7, wherein the biomass powder high pressure pneumatic conveying apparatus further comprises a controller;

The controller is respectively in communication connection with the material level detection device and the driving motor of each quantitative feeding device, which are correspondingly arranged on each feeding tank, and is also respectively in communication connection with the flow regulating valve and the cut-off valve on the discharging pipeline, which are connected with each feeding tank.

9. The biomass powder high-pressure pneumatic conveying device according to any one of claims 1 to 5, wherein a pressure relief opening is formed in the feeding tank;

a pressure equalizing pipeline is also connected between the discharge end of the feeding tank and the upper part of the feeding tank;

The gasification reactor is a gasification furnace;

the dosing device is a rotary valve or a star feeder.

10. The biomass powder high pressure pneumatic conveying apparatus according to any one of claims 1 to 5, wherein the discharge line does not include a horizontal line or an up line.