CN210814872U - Feeding system - Google Patents

Abstract

The utility model discloses a feeding system, including feeder, feeder includes the feed cylinder, set up a plurality of baffles, adjacent two along vertical direction interval in the feed cylinder the baffle forms accommodation space, accommodation space is provided with the stirring subassembly, the opening has been seted up on the baffle, powder blanking mouth has been seted up to feeder's bottom, a serial communication port, feeder still includes: the first sealing piece is clamped between the partition plate at the lowermost layer and the stirring assembly in the accommodating space at the lowermost layer; and a second sealing member interposed between the bottom plate of the cartridge and the agitating assembly in the lowermost accommodation space. The utility model discloses the feed stability that can solve prior art existence is easily influenced by low reaches gas pressure fluctuation, the feed measurement accuracy is low, runs the material, dashes the material scheduling problem.

Description

Feeding system

Technical Field

The utility model relates to a powder transportation feeder technical field especially relates to a supporting feed system in being suitable for middle-size and small-size buggy industrial boiler.

Background

The powder is commonly used in the industries of pulverized coal industrial boilers, kilns, cement, chemical industry, pharmacy and the like, and the industries of small-sized thermal power plants taking pulverized coal as fuel, cement ingredient production and the like cannot leave the powder feeding technology, and the powder feeding technology is also the key technology of the industries.

The core of the existing powder feeding technology metering lies in positive displacement metering, the key of the positive displacement metering lies in that a certain volume of powder needs to maintain relatively constant powder concentration, in the feeding process, the powder concentration in the volume of a metering unit is extremely easy to be influenced by other devices on the upstream and downstream of a feeding system, a folding feeding device is generally provided with a plurality of layers of stirring components, the gap between the upper side and the lower side of the last layer of stirring component and the upper wall and the lower wall of an accommodating space of the last layer of stirring component can enable the opening of the lowermost layer of partition plate of the feeding device and a powder blanking port to form a continuous communication state, on one hand, fluctuating downstream gas can flow up to the powder blanking port and enter the feeding device through the gap to be mixed with the powder, so that the powder density is uneven, further, the metering difficulty of; in addition, the feeding device is communicated with the downstream through a gap, and due to the existence of a self-flowing phenomenon (in the feeding device which can not release pressure, powder can generate a phenomenon of forcibly channeling along a material path channel), the powder can flow away along the gap, so that the problems of material running, material flushing and the like are caused, when the equipment runs, the metering precision of the feeding device is influenced, and when the equipment stops running, feeding can not be controlled, so that potential safety hazards are caused.

Therefore, there is a need to design a feeding system that addresses the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a feeding system to the feed stability that solves prior art existence easily receives low reaches gas pressure fluctuation influence, feed measurement accuracy low, and runs the material, dashes the material scheduling problem.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a feeding system, includes feeder, and feeder includes the feed cylinder, sets up a plurality of baffles along vertical direction interval in the feed cylinder, and two adjacent baffles form accommodation space, and accommodation space is provided with the stirring subassembly, has seted up the opening on the baffle, and the powder blanking mouth has been seted up to feeder's bottom, and feeding system still includes:

the first sealing element is clamped between the partition plate at the lowermost layer and the stirring assembly in the accommodating space at the lowermost layer; and

and the second sealing element is clamped between the bottom plate of the charging barrel and the stirring assembly in the accommodating space of the lowest layer.

Alternatively, the plurality of stirring assemblies are fixedly connected through a rotating shaft, and the rotating shaft is driven to rotate by the driving device.

Optionally, the stirring assembly includes at least two sets of stirring blade groups arranged at intervals along the vertical direction, and each set of stirring blade group includes a plurality of blades distributed at intervals along the circumferential direction.

Optionally, the number of the first sealing member and the second sealing member is two respectively; the projection of each first sealing element on the horizontal plane can completely cover the projection of a space surrounded by two adjacent blades of the stirring assembly at the lowermost layer on the horizontal plane, and the two first sealing elements are positioned at two sides of the projection of the powder blanking port on the horizontal plane; the projection of each second sealing element on the horizontal plane can completely cover the projection of the space surrounded by two adjacent blades of the stirring assembly at the lowermost layer on the horizontal plane, and the two second sealing elements are positioned on two sides of the projection of the powder blanking port on the horizontal plane.

Optionally, a first material containing space is defined by the blade of the stirring assembly located at the lowermost layer and the wall of the material barrel, a second material containing space is defined by the blade of the stirring assembly located at the upper layer and the wall of the material barrel, and the volume of the first material containing space is 1.1-1.5 times of the volume of the second material containing space.

Optionally, the openings of two adjacent partition plates are distributed on two sides of the rotating shaft on the horizontal plane.

Optionally, the feeding system further includes a flow stabilizer, the flow stabilizer is respectively communicated with the outlet of the feeding device and the powder burner, an upper taper hole is formed in the flow stabilizer, the cross-sectional area of the upper taper hole is gradually reduced from top to bottom, a lower taper hole is formed in the flow stabilizer below the upper taper hole, and the cross-sectional area of the lower taper hole is gradually increased from top to bottom.

Optionally, the lower end of the flow stabilizer is connected with a pulverized coal mixer, the pulverized coal mixer comprises a feeding pipe and an air inlet pipe which are communicated, the air inlet pipe is located below the feeding pipe, a feeding hole is formed in the feeding pipe, and the cross-sectional area of the feeding hole is gradually reduced from top to bottom.

Optionally, a guide hole is communicated with the lower portion of the feeding hole, and the guide hole is inclined from top to bottom towards the direction far away from the air inlet pipe.

Optionally, a first-stage accelerating nozzle and a second-stage accelerating nozzle which are detachably connected are sequentially arranged in the air inlet pipe along the flowing direction of the air, through holes are formed in the first-stage accelerating nozzle and the second-stage accelerating nozzle, the cross-sectional area of each through hole is gradually reduced along the flowing direction of the air, and the taper of the second-stage accelerating nozzle is smaller than that of the first-stage accelerating nozzle.

The utility model has the advantages that:

the utility model provides a feeding system presss from both sides between the stirring subassembly in lowermost baffle and lowermost accommodation space and establishes first sealing member, press from both sides between the stirring subassembly in the bottom plate of feed cylinder and lowermost accommodation space and establish the second sealing member, the sealing member can make the gap shutoff that last layer stirring subassembly upper and lower side and the bottom plate of feed cylinder and last layer baffle formed, thereby can not realize gaseous circulation through the gap between the opening of feeder lowermost baffle and the powder blanking mouth, undulant low reaches gas can't get into the accommodation space on feeder upper strata through the gap on the one hand, buggy in the feeder can keep stable buggy density, thereby realize more stable feed and more accurate measurement; on the other hand, the gap is plugged up, and gaseous can't flow through the gap, and the gravity flow loses this passageway, reaches the effect that effectively stops the phenomenon of flowing automatically to restrain and run material, towards material scheduling problem, can improve the measurement accuracy of positive displacement measurement when equipment moves, can prevent the uncontrolled phenomenon of feed under the equipment stall state, prevent dangerous the emergence.

Drawings

FIG. 1 is a schematic structural view of a feeding system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a partition according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 1;

fig. 4 is a top view of a flow stabilizer according to an embodiment of the present invention;

fig. 5 is a plan view of a powder mixer according to an embodiment of the present invention.

The figures are labeled as follows:

1-a feeding device; 2-a flow stabilizer; 3-air locking valve; 4-powder mixer; 5-a drive device; 6-rotating shaft;

11-a barrel; 12-a separator; 13-a stirring assembly; 14-powder blanking port; 15-a first seal; 16-a second seal; 17-an outlet; 18-a feed inlet; 21-upper taper hole; 22-lower taper hole; 41-a feeding pipe; 42-air inlet pipe; 43-a stage one acceleration nozzle; 44-a secondary acceleration nozzle;

111-receiving cylinder; 112-a material taking cylinder; 113-refining cylinder; 114-a feed cylinder; 121-opening; 131-a blade; 411-a feed hole; 412-guide holes.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The embodiment provides a feeding system, which can be used for powder feeding equipment in industries such as pulverized coal industrial boilers, kilns, cement, chemical engineering, pharmacy and the like, and is particularly suitable for feeding systems matched with small and medium pulverized coal industrial boilers. The present embodiment is exemplified by applying the powder feeding system to the feeding system of the pulverized coal industrial boiler. As shown in fig. 1, the feeding system comprises a feeding device 1, a flow stabilizer 2, an air lock valve 3 and a powder mixer 4 which are communicated with each other, wherein a feeding hole 18 of the feeding device 1 is connected with an outlet of a pulverized coal bunker, the feeding device 1 can fully stir pulverized coal sent from the pulverized coal bunker, the problem of low metering precision caused by uneven pulverized coal density is prevented, the pulverized coal is prevented from flowing automatically by means of sealing and the like, and the phenomena of material leakage, material flushing and the like of the pulverized coal are prevented; the flow stabilizer 2 has the functions of stabilizing the flow of the pulverized coal and blocking the upward channeling of downstream gas, and prevents the occurrence of larger fluctuation when the pulverized coal flows; the air locking valve 3 can buffer the impact of upstream instant feeding and effectively prevent downstream gas from channeling; one end of the powder mixer 4 is an air inlet pipe 42, the other end of the powder mixer is connected with the pulverized coal burner, and the powder mixer 4 can buffer and guide the falling pulverized coal and give the pulverized coal a horizontal speed. The pulverized coal sequentially passes through the feeding device 1, the flow stabilizing device 2, the air locking valve 3 and the powder mixer 4 and finally enters the combustor.

The feeding device 1 comprises a feeding barrel 11, the feeding barrel 11 is composed of a receiving barrel 111, a material taking barrel 112, a material homogenizing barrel 113 and a feeding barrel 114 from top to bottom, a partition plate 12 is arranged between the barrels, an opening 121 is formed in the partition plate 12, stirring assemblies 13 are arranged in the four barrels, the coal dust can be fully stirred by the stirring assemblies 13, the coal dust can enter the lower barrel from the upper barrel through the opening 121 in the partition plate 12, a powder blanking port 14 is formed in the bottom of the feeding device 1, and the coal dust enters the flow stabilizing device 2 through the powder blanking port 14.

In order to prevent the material running and material flushing problems which often occur in the transportation process, the openings 121 on the two adjacent partition plates 12 are distributed on two sides of the rotating shaft 6, the axis of the opening 121 forms a certain angle in the horizontal direction, 180 degrees in the embodiment, the coal powder can enter the next cylinder after rotating 180 degrees in the cylinder through the arrangement, the reciprocating process is carried out, the transportation path of the coal powder in the feeding device 1 is folded back for multiple times, and therefore the mechanical labyrinth sealing effect is achieved, namely when the coal powder generates the gravity flow phenomenon, the gravity flow channel becomes bent and not easy to flow away, the gravity flow phenomenon is prevented from being generated, and the material running and material flushing problems which often occur in the coal powder feeding and transportation process are relieved.

Preferably, the opening 121 on the partition 12 is provided in a fan shape as shown in fig. 2, and the shape of the opening 121 is consistent with the area swept by the blade, so as to more fully sweep the pulverized coal into the next layer of cylinder.

Alternatively, the receiving cylinder 111, the taking cylinder 112, the refining cylinder 113 and the feeding cylinder 114 may be connected by flanges.

Preferably, the feeding hole 18 of the feeding device 1 should be large enough, the diameter of the feeding hole 18 is between 400 and 800 mm, the diameter of the feeding hole 18 is in the range, sufficient feeding can be realized without the flow assistance of compressed air, the fluidization of the compressed air at the upstream is prevented, the pulverized coal enters the feeding device 1 in the form of integral flow, the density of the pulverized coal is ensured to be more uniform, and the feeding and metering precision of the pulverized coal is improved.

In order to realize the synchronous stirring of a plurality of stirring subassemblies 13 and reduce the quantity of the power source, the feeding device 1 of this embodiment further comprises a driving device 5 and a rotating shaft 6, the multilayer stirring subassemblies 13 are all fixed on the rotating shaft 6, the output end of the driving device 5 is connected with the rotating shaft 6, the driving device 5 can drive the rotating shaft 6 to rotate, the simultaneous stirring of different stirring subassemblies (13) can be controlled by one power source, and the stirring efficiency is improved. Specifically, the driving device 5 of the present embodiment is a driving motor horizontally placed, and an output end of the driving motor is connected to the rotating shaft 6 through a commutator, so as to realize the conversion of the rotating direction. In other embodiments, the driving device 5 may also be a rotary cylinder or a lead screw nut structure, etc. capable of outputting rotation, and the operator adjusts the instant feeding amount of the feeding device 1 by adjusting the rotation speed of the driving device 5.

The pulverized coal has certain humidity, the phenomenon of uneven density often occurs, the metering is inaccurate due to the uneven density of the pulverized coal, in order to enable the density of the pulverized coal to be even, 2-4 stirring blade groups and an impeller are arranged in the receiving cylinder 111, each layer of stirring blade group comprises a plurality of blades 131, the pulverized coal can be fully stirred in the horizontal direction, certain intervals are formed between every two layers of stirring blade groups and between the stirring blade groups and the impeller along the axial direction, the pulverized coal can be fully stirred in the vertical direction, the height of each blade 131 is 2-4 mm, the length of each blade 131 is 1/4-1/2 impeller diameter, the blades 131 cannot be too small to achieve the stirring effect, too large rotation resistance can not be caused, and the service life of each blade 131 is influenced; the impeller in the material receiving cylinder 111 can be in a straight shape or a cross shape, the impeller is 3-6 mm high, and the impeller can enable pulverized coal in the material receiving cylinder 111 to be rotationally scraped to the opening 121 of the layer of partition plate 12, so that the pulverized coal is conveyed to the material receiving cylinder 112. Through the design of the multilayer stirring assembly 13 in the receiving cylinder 111, the pulverized coal can be fully stirred and activated, the density of the pulverized coal is uniform, the precision of volumetric metering is improved, the pulverized coal adhesion can be prevented from being obstructed, and the bridging phenomenon is avoided.

Preferably, the number of the blades 131 in the feeding cylinder 114 is 12-24, enough blades can prevent too much coal powder in the material containing space surrounded by the blades 131, and multiple times of small amount of feeding in the rotation process of the impeller can reduce the fluctuation of coal powder feeding, so that the feeding is more stable; the problem that the coal powder is adhered to the gap between the blades 131 and cannot fall completely to cause inaccurate metering due to the fact that too many blades form a small material containing space and the coal powder is not adhered to the gap between the blades 131 can be solved, and metering accuracy is guaranteed.

In order to more stably convey the pulverized coal in the feeding cylinder 114 to the flow stabilizer 2, the height of the blades of the impeller in the feeding cylinder 114 is set to be 5-12 cm, and the height range can prevent the pulverized coal in the material containing space defined by the two blades from being excessively accumulated to cause obvious material collapse (when the blades of the impeller just rotate to the position of the blanking port, the blades lose the support due to the excessively high accumulated height of the pulverized coal, and the pulverized coal at the high position instantaneously collapses and falls), so that more stable feeding is ensured.

Preferably, the clearance between the inner wall of the feeding cylinder 114 and the radial outer edge of the blade 131 of the impeller is small enough, and is 0.25-0.5 mm, the clearance which is as small as possible in the existing machining precision allowable range is adopted, the circulation of downstream gas and a feeding device through the annular clearance can be effectively prevented, the coal powder self-flowing phenomenon is prevented, the effect of the generation of the material running and flushing phenomenon is prevented, more accurate metering can be realized during the operation of the equipment, the feeding can be prevented from being uncontrolled when the equipment stops operating, and the equipment is safer.

Preferably, the blade 131 of the impeller in the feeding cylinder 114 and the wall of the charging barrel enclose a first material containing space, the blade 131 of the impeller in the material taking cylinder 112 and the wall of the charging barrel enclose a second material containing space, the volume of the first material containing space is 1.1-1.5 times of the volume of the second material containing space, the material containing space in the feeding cylinder 114 is larger than the material containing space in the material taking cylinder 112, and the smooth transportation of the pulverized coal taken from the upper layer to the flow stabilizing device 2 can be guaranteed.

In order to prevent the fluctuating downstream gas from jumping upwards to influence the metering precision and the material running and flushing phenomena of the feeding device 1, a first sealing element 15 is arranged between the lowermost partition plate 12 and the impeller in the feeding cylinder 114, a second sealing element 16 is arranged between the bottom plate of the feeding cylinder 114 and the impeller in the feeding cylinder 114, and the sealing elements can seal gaps formed by the upper side and the lower side of the impeller in the feeding cylinder 114, the bottom plate of the feeding cylinder 114 and the last partition plate 13, so that the gas circulation between the opening 121 of the lowermost partition plate 12 of the feeding device 1 and the powder blanking port 14 cannot be realized through the gaps, on one hand, the fluctuating downstream gas cannot enter the cylinder on the upper layer of the feeding device 1 through the gaps, and the pulverized coal in the feeding device 1 can keep stable pulverized coal density, thereby realizing more stable feeding and more accurate metering; on the other hand, gas can not circulate through the gap, so that the self-circulation is well prevented, the problems of material running, material flushing and the like are solved, the metering precision of volumetric metering can be improved when the equipment stops running, the phenomenon that feeding is not controlled can be prevented when the equipment stops running, and dangers are prevented.

Preferably, as shown in fig. 3, two first sealing members 15 are respectively located on two sides of the projection of the powder blanking port 14 on the horizontal plane, two second sealing members 16 are respectively located on two sides of the projection of the powder blanking port 14 on the horizontal plane, the projection of each sealing member on the horizontal plane can completely cover the projection of the space surrounded by two adjacent blades 131 of the lowermost stirring assembly 13 on the horizontal plane, and it can be ensured that no matter which angle the stirring assembly 13 rotates to, at least one blade can abut against the first sealing member and the second sealing member, so as to ensure that gaps between the impeller and the bottom plate of the charging barrel and the lowermost partition plate 12 are sealed, and an effect of isolating the outlet 121 of the lowermost partition plate 12 from the powder blanking port 14 is achieved.

Preferably, the first sealing member 15 and the second sealing member 16 are made of a flexible material such as rubber, wool felt, etc., so as to reduce the abrasion of the sealing members to the impeller in the feeding cylinder 114.

Preferably, the size of the outlet 17 of the pulverized coal feeding device 1 is one sixth of the horizontal projection area of the outer edge of the impeller in the feeding cylinder 114, so as to ensure that the pulverized coal transported by the impeller in the feeding cylinder 114 can be smoothly transported to the flow stabilizer 2 from the outlet.

Optionally, the flow stabilizer 2 is connected with the feeding device 1 and the air lock valve 3 through flanges respectively.

In order to buffer the impact of upstream instant feeding and prevent downstream gas from flowing upwards, the flow stabilizer 2 is provided with an upper taper hole 21 and a lower taper hole 22 which are communicated, the cross section area of the upper taper hole 21 is gradually reduced from top to bottom, the included angle between a bus and the vertical direction is 10-20 degrees, the inclined hole surface of the upper taper hole 21 plays a role in buffering falling coal powder, the coal powder can more slowly and uniformly flow into the air locking valve 3, the cross section area of the lower taper hole 22 is gradually increased from top to bottom, the included angle between the bus and the vertical direction is 10-60 degrees, the inclined hole surface of the lower taper hole 22 can effectively prevent the fluctuating downstream gas from flowing upwards, the downstream gas is prevented from entering the feeding device 1 and being mixed with the coal powder to influence the density of the coal powder, and the feeding.

Preferably, the air locking valve 3 is connected to the lower side of the flow stabilizer 2, the air locking valve 3 may be an air locking rotary valve, and in this embodiment, the air locking valve is composed of an impeller and a valve housing which are axially and horizontally placed. The pulverized coal falls into the air lock valve 3 from the flow stabilizer 2 under the action of gravity, and the pulverized coal pushes the impeller to rotate, so that the pulverized coal is conveyed to the feeding hole 411 of the powder mixer 4. The radial clearance of blade outer fringe and valve case is 0.2 ~ 0.5mm, adopts this machining precision allowed in-range clearance as far as possible, realization that can be better lock gas effect, prevents that the gaseous upper leap of low reaches from influencing feeder and stablize and measurement accuracy.

In order to buffer falling coal powder, as shown in fig. 5, the coal powder mixer 4 comprises a feeding pipe 41 and an air inlet pipe 42 which are communicated with each other, the air inlet pipe 42 is located below the feeding pipe 41, a feeding hole 411 is formed in the feeding pipe 41, an included angle between a hole surface of one side, close to the air inlet pipe 42, of the feeding hole 411 and the vertical direction is 10-25 degrees, an included angle between a hole surface of one side, far away from the air inlet pipe 42, of the feeding hole 411 and the vertical direction is 20-30 degrees, so that the cross-sectional area of the feeding hole 411 is gradually reduced from top to bottom, the inclined hole surface of the feeding hole 411 can buffer falling coal powder, and the influence of pressure fluctuation and airflow fluctuation generated after the coal powder falls into the coal powder mixer 4.

In order to enable the pulverized coal to form a good flow field structure during horizontal acceleration, a guide hole 412 is communicated below the feeding hole 411, the inclination angle of the hole surface of the guide hole 412 close to one side of the air inlet pipe 42 is consistent with that of the hole surface of the feeding hole 411 close to one side of the air inlet pipe 42, and the included angle between the hole surface of the guide hole 412 far away from one side of the air inlet pipe 42 and the vertical direction is 30-45 degrees, so that the guide hole 412 is inclined from top to bottom towards the direction far away from the air inlet pipe (42), the pulverized coal falls through the inclined guide hole 412, a region with small local resistance can be formed below the feeding pipe 41, and the pulverized coal horizontal acceleration region is guaranteed to form a good flow field structure; in addition, the falling coal dust can have the horizontal speed consistent with the given wind direction, so that the coal dust can be accelerated conveniently.

Preferably, a first-stage accelerating nozzle 43 and a second-stage accelerating nozzle 44 which are detachably connected are sequentially arranged in the air inlet pipe 42 along the flowing direction of the air, through holes are formed in the first-stage accelerating nozzle 43 and the second-stage accelerating nozzle 44, the cross sectional area of each through hole is gradually reduced along the flowing direction of the air as shown in fig. 1, and the taper of the second-stage accelerating nozzle 44 is smaller than that of the first-stage accelerating nozzle 43, so that the second-stage accelerating nozzle 44 can provide the air speed larger than that of the first-stage accelerating nozzle 43.

Preferably, the connection mode of the first-stage accelerating nozzle 43 and the second-stage accelerating nozzle 44 can be threaded connection or plug connection, and the second-stage accelerating nozzle 44 can be replaced more conveniently by adopting a detachable installation mode so as to meet the requirement of the pulverized coal burner.

Preferably, the first-stage acceleration nozzle 43 ejects air with a speed of 0.1 to 0.3 times the local speed of sound, and the second-stage acceleration nozzle 44 ejects air with a speed of 0.4 to 0.65 times the local speed of sound.

The feeding system of the embodiment specifically works as follows:

step 1: the operator connects the outlet of the coal dust bin with the inlet 18 of the feeding device 1 and continuously injects the coal dust into the inlet 18 of the feeding device 1.

Step 2: the operator switches on the drive 5 and adjusts the rotational speed of the drive 5 as required to determine the instantaneous feed quantity of the feed device 1.

And step 3: the driving device 5 drives the stirring assembly 13 to rotate, the pulverized coal passes through the receiving cylinder 111, the material taking cylinder 112, the refining cylinder 113 and the feeding cylinder 114 from the feeding port 18 to reach the powder blanking port 14 in sequence under the stirring action of the stirring blade group and the scraping and feeding action of the impellers at all levels, enters the flow stabilizing device 2 through the outlet 17 of the feeding device 1 under the action of gravity, reaches the powder mixer 4 through the air locking valve 3, and is guided by the feeding hole flow stabilizing device 411 and the guide hole 412 to fall to the outlet of the accelerating nozzle.

And 4, step 4: the operator injects wind into the wind inlet pipe 42, and the wind is accelerated by the primary acceleration nozzle 43/the secondary acceleration nozzle 44 and blown out from the outlet of the acceleration nozzle.

And 5: the pulverized coal enters the pulverized coal burner along the wind direction under the blowing acceleration of the accelerating wind.

Of course, the powder feeding system of the application can also be used in the industries of cement ingredient production, chemical industry, pharmacy and the like.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims (10)

1. The utility model provides a feeding system, includes feeder (1), feeder (1) includes feed cylinder (11), set up a plurality of baffles (12), adjacent two along vertical direction interval in feed cylinder (11) baffle (12) form accommodation space, accommodation space is provided with stirring subassembly (13), opening (121) have been seted up on baffle (12), powder blanking mouth (14) have been seted up to feeder's bottom, its characterized in that, feeding system still includes:

a first sealing member (15) interposed between the partition plate (12) of the lowermost layer and the stirring assembly (13) in the accommodation space of the lowermost layer; and

a second seal (16) interposed between the floor of the cartridge (11) and the stirring assembly (13) in the lowermost receiving space.

2. The feeding system according to claim 1, wherein a plurality of said stirring assemblies (13) are fixedly connected by a rotating shaft (6), said rotating shaft (6) being driven in rotation by a driving means (5).

3. The feeding system according to claim 2, wherein the stirring assembly (13) comprises at least two groups of stirring blades arranged at intervals in the vertical direction, each group of stirring blades comprising a plurality of blades (131) distributed at intervals in the circumferential direction.

4. A feeding system according to claim 3, wherein said first seal (15) and said second seal (16) are respectively two in number; the projection of each first sealing piece (15) on the horizontal plane can completely cover the projection of a space surrounded by two adjacent blades (131) of the stirring assembly (13) at the lowest layer on the horizontal plane, and the two first sealing pieces (15) are positioned on two sides of the projection of the powder blanking port (14) on the horizontal plane; the projection of each second sealing piece (16) on the horizontal plane can completely cover the projection of a space surrounded by two adjacent blades (131) of the stirring assembly (13) on the horizontal plane at the lowest layer, and the two second sealing pieces (16) are positioned on two sides of the projection of the powder blanking port (14) on the horizontal plane.

5. The feeding system according to claim 3, wherein the blades (131) of the stirring assembly (13) at the lowest layer and the wall of the material barrel enclose a first material containing space, the blades (131) of the stirring assembly (13) at the upper layer and the wall of the material barrel enclose a second material containing space, and the volume of the first material containing space is 1.1-1.5 times of the volume of the second material containing space.

6. A feeding system according to claim 2, wherein said openings (121) of two adjacent partitions (12) are distributed in a horizontal plane on both sides of said axis of rotation (6).

7. The feeding system according to any one of claims 1 to 6, further comprising a flow stabilizer (2), wherein the flow stabilizer (2) is respectively communicated with the outlet (17) of the feeding device (1) and the powder burner, an upper tapered hole (21) is formed in the flow stabilizer (2), the cross-sectional area of the upper tapered hole (21) is gradually reduced from top to bottom, a lower tapered hole (22) is formed in the flow stabilizer (2) below the upper tapered hole (21), and the cross-sectional area of the lower tapered hole (22) is gradually increased from top to bottom.

8. The feeding system of claim 7, wherein a coal powder mixer (4) is connected to the lower end of the flow stabilizer (2), the coal powder mixer (4) comprises a feeding pipe (41) and an air inlet pipe (42) which are communicated with each other, the air inlet pipe (42) is located below the feeding pipe (41), a feeding hole (411) is formed in the feeding pipe (41), and the cross-sectional area of the feeding hole (411) is gradually reduced from top to bottom.

9. The feeding system of claim 8, wherein a guiding hole (412) is communicated with the lower portion of the feeding hole (411), and the guiding hole (412) is inclined from top to bottom in a direction away from the air inlet pipe (42).

10. The feeding system of claim 9, wherein a first-stage accelerating nozzle (43) and a second-stage accelerating nozzle (44) which are detachably connected are sequentially arranged in the air inlet pipe (42) along the flowing direction of the wind, through holes are formed in the first-stage accelerating nozzle (43) and the second-stage accelerating nozzle (44), the cross-sectional area of each through hole is gradually reduced along the flowing direction of the wind, and the taper of the second-stage accelerating nozzle (44) is smaller than that of the first-stage accelerating nozzle (43).

Images