CN107555178A - A kind of powder conveying apparatus and its application - Google Patents
A kind of powder conveying apparatus and its application Download PDFInfo
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Abstract
The invention discloses a kind of powder conveying apparatus and its application, belongs to Geldart-D particle field.It includes riser tubing, feed pipe and purging pipeline；The riser tubing is followed successively by lower flange, lower straight section, lower contraction section, expansion segment, middle straight section, upper contraction section, upper straight section and upper flange from down to up；The feed pipe is arranged on the expansion segment and connected with the riser tubing, and the axis of the feed pipe is perpendicular to the axis of the riser tubing；The purging pipeline is arranged in the expansion pipe and connected with the riser tubing, and the purging pipeline is located at immediately below the feed pipe.The present invention solves powder conveying apparatus of the prior art and blanking phenomenon, and the technical problem that pressure drop is big easily occurs, powder and gas can be sufficiently mixed, the pressure drop in course of conveying it is small, and equipment is simple, stable and reliable operation.
Description
Technical Field
The invention belongs to the field of pneumatic conveying, and particularly relates to a powder conveying device and application thereof.
Background
The pneumatic conveying device conveys powder materials in a closed pipeline by utilizing the fluidization principle, has simple equipment structure and convenient operation, can convey the powder materials in a horizontal, vertical or inclined direction, and can simultaneously carry out physical operations such as heating, cooling, drying and the like or certain chemical operations of the materials in the conveying process.
In the dilute phase pneumatic conveying process, in order to vertically convey the powder material upwards, the powder material needs to be uniformly distributed into the upward flowing air flow, and the upward flowing air flow needs to have enough speed. For making the powder material fully mix with gaseous and be carried upwards in vertical ascending pipeline, the tradition way is directly to be connected the pipeline of powder material with gas piping, but under this condition, powder material and gas mixing effect are poor, appear blanking or the too big problem of pressure drop easily in equipment operation process, still improve through the fan power that increases conveying gas in addition, powder material and gas mixing effect, but the energy consumption is higher.
Chinese invention patent, publication number: CN104512728A, publication date: 2015, 4 months and 15 days, a gas-solid mixing chamber for negative pressure pneumatic conveying of flour is disclosed, which comprises an air inlet, a blanking port, a mixing chamber, a convergent injection section, an accelerating throat section and a divergent injection section, wherein a gas-solid mixing outlet is formed, materials and air flow are mixed and then are carried at a high speed through the convergent injection section, the accelerating throat section and the divergent injection section to be sucked away, and the gas-solid mixing chamber is suitable for pneumatic conveying of dilute phase materials with large conveying capacity and short distance. The invention has low power consumption, high conveying speed, dispersed state and good continuity. The disadvantages are as follows: (1) The speed of the gas flowing along the pipe wall is low, even a flow dead zone is easy to occur, so that material powder is retained; (2) The scheme is suitable for conveying flour in the horizontal direction, but not suitable for conveying powder in the vertical direction, and the problems of pressure drop, influence of the gravity of the powder, uniform mixing and the like are also considered when the powder is conveyed in the vertical direction; if the velocity of the inlet gas is too high, the pressure drop is large and the energy consumption of the device is high.
Chinese invention patent, publication number: CN105966921A, publication date: 2016, 9, 28 days, a dispenser for pneumatic delivery of particulate solids is disclosed. The high-pressure gas injection pipe, the solid feed opening, the gas-solid mixing chamber and the gas-solid two-phase mixing ejection pipe are connected into a whole, the high-pressure gas injection pipe, the gas-solid mixing chamber and the gas-solid two-phase ejection pipe are located on the same central axis, the gas-solid mixing chamber is formed between the high-pressure gas injection pipe and the gas-solid two-phase ejection pipe, the solid feed opening is located above the gas-solid mixing chamber, the gas-solid mixing chamber is communicated with the high-pressure gas injection pipe, the solid feed opening and the gas-solid two-phase ejection pipe respectively, the high-pressure gas injection pipe is in a tapered mode, and the gas-solid two-phase mixing ejection pipe is in a tapered mode. The material sending device for pneumatic conveying of the granular solid effectively improves the conveying capacity. The disadvantages are that: (1) The cross section area of the gas-solid mixing chamber between the tapered high-pressure gas injection pipe and the tapered gas-solid two-phase mixing injection pipe is smaller, so that material blockage is easy to occur; (2) The device has the same defects as the invention patent with the publication number of CN104512728A, namely the problems of pressure drop, the influence of the gravity of powder, uniform mixing and the like are not considered, so that the device is not suitable for conveying the powder in the vertical direction.
Disclosure of Invention
1. Problems to be solved
The invention provides a powder conveying device and application thereof, aiming at the problems that blanking and large pressure drop are easy to occur in the operation process of the conventional powder conveying device. The powder and gas can be fully mixed, the blanking phenomenon can not occur in the powder conveying process, and the pressure drop of the equipment is small.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The utility model provides a powder conveyor, includes lifting pipe and charge-in pipeline, lifting pipe includes the entry, lower contraction section, expansion section and the export that follow supreme setting gradually down, charge-in pipeline sets up on the expansion section and with the expansion section intercommunication, still be provided with on the expansion section and sweep the pipeline, sweep the pipeline and be located under the charge-in pipeline and with the expansion section intercommunication.
Further, the axis of the purge conduit is perpendicular to the outer wall of the expanding section; alternatively, the axis of the purge conduit is perpendicular to the axis of the lift conduit.
Further, the purge conduit has a diameter greater than the diameter of the feed conduit.
Furthermore, the expansion section is provided with at least one feeding pipeline, the number of the purging pipelines is the same as that of the feeding pipelines, the feeding pipelines and the purging pipelines are uniformly distributed on the periphery of the lifting pipeline, and one purging pipeline is arranged right below each feeding pipeline.
Further, the contraction angle of the lower contraction section is α and the expansion angle of the expansion section is β, wherein 10 ° < α <80 °,10 ° < β <80 °.
Further, the device also comprises an upper contraction section, and the expansion section, the upper contraction section and the outlet are communicated in sequence.
Further, the contraction angle of the upper contraction section is gamma, and the gamma is more than or equal to 0 degrees and less than 80 degrees.
Further, the expansion device also comprises a middle straight section, and the expansion section, the middle straight section, the upper contraction section and the upper straight section are communicated in sequence.
Use of a powder delivery device comprising:
step one, introducing flue gas into the inlet, wherein the flow velocity of the flue gas is V y Flue gas flow of m g ；
Step two, introducing into the purging pipelineIntroducing purge gas at a velocity V c ；
Thirdly, powder is conveyed into the lifting pipeline through the feeding pipeline, and the feeding speed is V s And has a particle diameter of D s Powder flow of m s ；
Wherein the diameter of the throat between the lower contraction section and the expansion section is D, the corresponding solid-gas ratio theta is 0.1-10 y 、V c 、V s 、D s And D satisfies the following relationship:
V c ＝0.3V y
V s ＝0.1V y
V y ＝2V 0
m s ＝θm g
in the formula: v 0 : the free suspension velocity (m/s) of the particles;
D s : the diameter (m) of the particles;
ρ s : density of granules (kg/m) 3 )；
ρ: density of flue gas (kg/m) 3 )；
C: a coefficient of drag;
g: acceleration of gravity (m/s) 2 )。
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) The powder conveying device provided by the invention has the advantages that the phenomenon of blanking can not occur in the process of conveying powder along the vertical direction, the pressure drop of equipment is small, the equipment is simple, and the operation is stable and reliable;
(2) According to the powder conveying device provided by the invention, the smoke forms backflow in the expansion section, so that the contact time of the smoke and materials is prolonged, and the material stream is broken up by the blowing gas introduced into the blowing pipeline, so that the materials are prevented from agglomerating on one hand, and the smoke and the materials are favorably and fully mixed on the other hand;
(3) According to the powder conveying device provided by the invention, the material feeding mode is improved by uniformly arranging the plurality of feeding pipelines and the blowing pipeline on the periphery of the lifting pipeline, so that the material feeding distribution is more uniform, the material agglomeration is prevented, and the flue gas and the material are more sufficiently and uniformly mixed;
(4) According to the powder conveying device provided by the invention, the impact force of the blowing gas on material streams is maximum after the blowing gas passes through the blowing pipeline vertical to the outer wall of the expansion section, so that the material scattering effect is better;
(5) According to the powder conveying device provided by the invention, the diameter of the blowing pipeline is larger than that of the feeding pipeline, so that the blowing gas can completely blow and disperse material streams, and the dispersed materials are easily blown by smoke and fully mixed;
(6) According to the powder conveying device provided by the invention, the flue gas is accelerated in the lower contraction section, and the speed of the flue gas discharged from the throat is maximized, so that the material is easier to blow, and the blockage of the material at the throat is prevented;
(7) According to the powder conveying device provided by the invention, the middle straight section is arranged to prolong the backflow area of the flue gas, so that the flue gas and the materials are further promoted to be fully mixed;
(8) According to the powder conveying device provided by the invention, the arrangement of the upper contraction section increases the proportion of flue gas backflow, so that the mixing of the flue gas and materials is further promoted, in addition, the flue gas blows up the powder materials entering from the feeding pipeline in the expansion section, and after entering the upper contraction section at the upper part, the speed of the flue gas is gradually increased, so that the speed at the outlet is higher;
(9) The powder conveying device provided by the invention is applied, the phenomenon of blanking can not occur in the powder conveying process, the pressure drop of equipment is small, the blockage problem is not easy to occur, and the flue gas and the materials are mixed more fully and uniformly.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a powder conveying apparatus in embodiment 2;
fig. 3 is a schematic structural view of a powder conveying device in embodiment 3.
In the figure: 10. lifting the pipeline; 11. an upper flange; 12. an upper straight section; 13. an upper contraction section; 14. a middle straight section; 15. an expansion section; 16. a lower contraction section; 17. a lower straight section; 18. a lower flange; 19. a laryngeal opening; 20. purging the pipeline; 30. a feed conduit.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments.
Example 1
As shown in fig. 1, a powder conveying device comprises a lifting pipeline 10 and a feeding pipeline 30, wherein the lifting pipeline 10 comprises an inlet, a lower contraction section 16, an expansion section 15 and an outlet which are sequentially arranged from bottom to top, the feeding pipeline 30 is arranged on the expansion section 15 and is communicated with the expansion section 15, a purging pipeline 20 is further arranged on the expansion section 15, and the purging pipeline 20 is located under the feeding pipeline 30 and is communicated with the expansion section 15.
The structure of the existing powder conveying device is compared with that of the powder conveying device in the embodiment, and the structure is different in that: the blowing pipeline 20 is not arranged below the feeding pipeline 30, and the lifting pipeline 10 does not contain a contraction structure, so in the existing powder conveying device, after powder enters the lifting pipeline 10 through the feeding pipeline 30, the powder is gathered into a stream and flows downwards along the inner wall of the lifting pipeline 10 under the action of gravity, and the stream-shaped powder can be blown up by high-speed smoke, so that the blanking phenomenon is very easy to occur, and even blockage is caused; in order to solve the blanking problem, people generally improve the flow velocity of the smoke at the inlet, but along with the increase of the smoke velocity at the inlet, the energy consumption of the equipment is increased, and the pressure drop is also increased.
In the specific application of the powder conveying device of this embodiment, a certain speed of flue gas is introduced into the inlet, an aluminum hydroxide material (usually aluminum hydroxide powder containing moisture) is introduced into the feeding pipe 30, a certain speed of purge gas is introduced into the purge pipe 20, the aluminum hydroxide material enters the lifting pipe 10 to form a stream under the action of gravity and flows downwards along the inner wall of the lifting pipe 10, the stream is broken into particles by the purge gas when flowing through the communication between the purge pipe 20 and the expansion section 15, so as to effectively prevent the material from agglomerating, and the flue gas enters the lower contraction section 16 from the lower inlet, is accelerated in the contraction section 16, passes through the throat 19 to enter the expansion section 15, and blows the dispersed aluminum hydroxide material upwards in the expansion section 15 and is taken out of the conveying device through the outlet, because the speed of the flue gas is reduced and forms a backflow after entering the expansion section 15, so that the mixing time of the flue gas and the aluminum hydroxide material is prolonged, and the flue gas and the aluminum hydroxide material are sufficiently mixed, thereby being beneficial to heating, drying or cooling the aluminum hydroxide material. Compared with the stream-strand-shaped aluminum hydroxide material before scattering, the granular aluminum hydroxide material has smaller self gravity, so that the granular aluminum hydroxide material is easier to be blown by flue gas and is not easy to have the phenomenon of blanking; in addition, as the particle size of the scattered granular aluminum hydroxide material is reduced and the self gravity is smaller, the speed of the flue gas introduced from the inlet is not required to be too high, and the energy consumption and the pressure drop of the equipment are also reduced; again, the flue gas accelerates within the constriction 16 and reaches a maximum at the throat 19, which helps to avoid plugging of the aluminium hydroxide feed at the throat 19.
Example 2
As shown in FIG. 1, the powder conveying apparatus has a structure different from that of example 1 in that: the axis of the purging pipeline 20 is perpendicular to the outer wall of the expansion section 15, the impact force of the purging gas on the material flow after passing through the purging pipeline 20 is large in the arrangement mode, in addition, the diameter of the purging pipeline 20 is larger than that of the feeding pipeline 30, so that the purging gas can completely blow and disperse the material flow, and the dispersed material is easily blown by smoke and is fully mixed. In specific implementation, the arrangement mode that the axis of the purging pipeline 20 is perpendicular to the axis of the lifting pipeline can also be adopted, that is, the purging pipeline 20 is horizontally arranged, so that the effect of blowing the material off the wall surface can also be achieved.
Example 3
Compared with the embodiment 1, the powder conveying device has the following structure that: the expansion section 15 is provided with at least one feeding pipeline 30, the number of the purging pipelines 20 is the same as that of the feeding pipelines 30, the feeding pipelines 30 and the purging pipelines 20 are uniformly distributed on the periphery of the lifting pipeline 10, and each purging pipeline 20 is arranged right below the feeding pipeline 30, through the mode that the plurality of feeding pipelines 30 and the purging pipelines 20 are uniformly arranged on the periphery of the lifting pipeline 10, the material feeding mode is improved, the material feeding distribution is more uniform, the material agglomeration is prevented, the flue gas and the material are mixed more sufficiently and uniformly, in the specific implementation, the number of the feeding pipelines 30 can be two, three, four and the like, in the embodiment, the number of the feeding pipelines 30 and the purging pipelines 20 is two, the two feeding pipelines 30 are symmetrically arranged on the outer wall of the lifting pipeline 10, and the purging pipelines 20 are arranged right below each feeding pipeline 30.
Example 4
As shown in fig. 1, a powder conveying device has a structure different from that of example 1 in that: the contraction angle of the lower contraction section 16 is alpha, the expansion angle of the expansion section 15 is beta, wherein the angle is 10 degrees < alpha <80 degrees, the angle is 10 degrees < beta <80 degrees, and the smoke is accelerated when passing through the lower contraction section 16 and reaches the maximum value at the throat 19, so that on one hand, the material blockage at the throat 19 is prevented, and on the other hand, the accelerated smoke can blow up the material better, so that the blanking phenomenon is prevented; the setting of expansion section 15 makes flue gas velocity descend and form the backward flow, both reduced the energy consumption, also prolong the contact time of flue gas and material to can the homogeneous mixing, this is because the flue gas does not need too high speed when expansion section 15 will be blown up by the broken up material, therefore flue gas velocity descends and also can not influence and blow up the effect behind throat 19, in addition, the pressure loss that too high flue gas velocity produced is also high, consequently at 15 flue gas velocity reductions of expansion section, also help reducing the energy consumption. In specific implementation, α and β may be 11 °, 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, 55 °, 66 °, 73 °, 79 °, and the like, in this embodiment, α is 50 ° and β is 20 °, and under the condition of ensuring no blanking, the pressure drop of the device is also small.
Example 5
As shown in FIG. 1, the powder conveying apparatus has a structure different from that of example 1 in that: the device is characterized by further comprising an upper contraction section 13, the expansion section 15, the upper contraction section 13 and the outlet are sequentially communicated, the contraction angle of the upper contraction section 13 is gamma, gamma is more than or equal to 0 degrees and less than 80 degrees, the flue gas blows up powder materials entering from the feeding pipeline 30 in the expansion section 15, and after entering the upper contraction section 13 on the upper portion, the speed of the flue gas is gradually increased, so that the speed at the outlet is higher, in addition, the mode that the upper contraction section 13 is arranged between the expansion section 15 and the outlet promotes the backflow of the flue gas, prolongs the retention time of the materials, and is beneficial to the uniform mixing of the flue gas and the materials. In specific implementation, γ may be 1 °, 15 °, 30 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 79 °, and the like, and γ in this embodiment is 40 °.
Example 6
As shown in FIG. 2, a powder conveying apparatus is different from embodiment 5 in the following structure: still include middle straight section 14, expand section 15 middle straight section 14 go up the shrink section 13 with go up straight section 12 and communicate in proper order, through setting up the regional back flow of middle straight section 14 extension flue gas, further promote the intensive mixing of flue gas and material.
Example 7
As shown in fig. 3, a powder conveying device comprises a lifting pipeline 10 and a feeding pipeline 30, wherein the lifting pipeline 10 is communicated with the feeding pipeline 30, the lifting pipeline 10 comprises a lower flange 18, a lower straight section 17, a lower contracted section 16, an expanded section 15, a middle straight section 14, an upper contracted section 13, an upper straight section 12 and an upper flange 11 which are sequentially communicated from bottom to top, the feeding pipeline 30 is arranged on the expanded section 15, the axis of the feeding pipeline 30 is perpendicular to the axis of the lifting pipeline 10, and the feeding pipeline 30 is communicated with the expanded section 15.
A purge line 20 is arranged right below the feed line 30, the purge line 20 is arranged on the expanding section 15 and is communicated with the expanding section 15, and the axis of the purge line 20 is perpendicular to the axis of the feed line 30.
The lifting pipeline 10 is provided with at least one feeding pipeline 30, the number of the purging pipelines 20 is the same as that of the feeding pipelines 30, in this embodiment, the number of the feeding pipelines 30 and the purging pipelines 20 is two, the feeding pipelines 30 and the purging pipelines 20 are uniformly distributed on the periphery of the lifting pipeline 10, and the purging pipelines 20 are arranged right below each feeding pipeline 30.
The lower converging section 16 has a converging angle alpha of 20 deg..
The expansion angle β of the expansion section 15 is 30 °.
The upper narrowing section 13 has a narrowing angle γ of 70 °.
Gas enters the lifting pipeline 10 from the inlet below, enters the lower contraction section 16 after passing through the lower straight section 17, the gas expands and accelerates in the lower contraction section 16, crosses the throat 19 and enters the expansion section 15, powder materials entering from the feeding pipeline 30 are blown upwards in the expansion section 15 to enter the middle straight section 14 on the upper part, the upper contraction section 13 and the upper straight section 12, the gas and the powder materials are fully mixed in the flowing process and are taken out of the powder conveying device, the powder materials falling from the feeding pipeline 30 are scattered, so that the gas and the materials are fully mixed, and the blowing gas is introduced into the blowing pipeline 20 to prevent the materials from agglomerating.
Example 8
As shown in fig. 1, an application of the powder conveying apparatus in embodiment 1 includes:
step one, introducing flue gas into the inlet, wherein the flow velocity of the flue gas is V y Flue gas flow of m g ；
Step two, introducing purge gas into the purge pipeline 20, wherein the speed of the purge gas is V c ；
Thirdly, powder is conveyed into the lifting pipeline 10 through the feeding pipeline 30, and the feeding speed is V s And a particle diameter of D s The flow rate of the powder is m s ；
Wherein, the diameter of the throat 19 between the lower contraction section 16 and the expansion section 15 is D, the corresponding solid-gas ratio theta is 0.1-10, when the concrete implementation is carried out, theta can be 0.1, 0.2, 0.5, 1.0, 1.1, 1.3, 2.6, 3, 3.2, 4.0, 4.7, 6.0, 6.4, 7.3, 8.0, 8.2, 9.3, 10 and the like, in the embodiment, theta is 0.1 y 、V c 、V s 、D s And D satisfies the following relationship:
V c ＝0.3V y
V s ＝0.1V y
V y ＝2V 0
m s ＝θm g
in the formula: v 0 : the free suspension velocity (m/s) of the particles;
D s : the diameter (m) of the particles;
ρ s : density of granules (kg/m) 3 )；
ρ: density of flue gas (kg/m) 3 )；
C: a coefficient of drag;
g: acceleration of gravity (m/s) 2 )。
In this example, the feed line 30 is fed with a powder of an aluminum hydroxide material and the purge line 20 is fed with a purge gas, V, at a rate y 、V c 、V s 、D s And D, when the relation is met, when the aluminum hydroxide powder material flow stream flows through the communication part of the purging pipeline 20 and the expansion section 15, the purged gas is completely dispersed, the phenomenon that the materials are agglomerated to cause blanking or blockage at the throat 19 is prevented, the smoke accelerates in the contraction section 16 and enters the expansion section 15 after crossing the throat 19, under the condition that the solid-gas ratio is strictly controlled to be 0.1, the smoke upwards blows the dispersed aluminum hydroxide materials in the expansion section 15, the speed of the smoke declines in the expansion section 15, and backflow is formed, so that the smoke and the materials are mixed more fully and uniformly; in addition, the present embodiment strictly controls V y 、V c 、V s 、D s And D, the energy consumption and the pressure drop of the equipment are small while the blanking is not generated.
Claims (9)
1. A powder conveyor, includes lifting pipe (10) and charge-in pipeline (30), its characterized in that: lifting pipe way (10) include from the lower supreme entry that sets gradually, contract section (16), expansion section (15) and export down, charge-in pipeline (30) set up expansion section (15) go up and with expansion section (15) intercommunication, still be provided with on expansion section (15) and sweep pipeline (20), sweep pipeline (20) be located under charge-in pipeline (30) and with expansion section (15) intercommunication.
2. The powder conveying apparatus according to claim 1, wherein: the axis of the purge conduit (20) is perpendicular to the outer wall of the expansion section (15); alternatively, the axis of the purge conduit (20) is perpendicular to the axis of the lift conduit (10).
3. The powder conveying apparatus according to claim 1, wherein: the purge line (20) has a diameter greater than the diameter of the feed line (30).
4. The powder conveying apparatus according to claim 1, wherein: the expansion section (15) is provided with at least one feeding pipeline (30), the number of the purging pipelines (20) is the same as that of the feeding pipelines (30), the feeding pipelines (30) and the purging pipelines (20) are uniformly distributed on the periphery of the lifting pipeline (10), and one purging pipeline (20) is arranged right below each feeding pipeline (30).
5. The powder conveying apparatus according to claim 1, wherein: the contraction angle of the lower contraction section (16) is alpha, and the expansion angle of the expansion section (15) is beta, wherein 10 degrees < alpha <80 degrees, and 10 degrees < beta <80 degrees.
6. The powder conveying apparatus according to any one of claims 1 to 5, wherein: the expansion device is characterized by further comprising an upper contraction section (13), wherein the expansion section (15), the upper contraction section (13) and the outlet are communicated in sequence.
7. The powder conveying apparatus according to claim 6, wherein: the contraction angle of the upper contraction section (13) is gamma, and the gamma is more than or equal to 0 degrees and less than 80 degrees.
8. The powder conveying apparatus according to claim 6, wherein: the expansion joint is characterized by further comprising a middle straight section (14), wherein the expansion section (15), the middle straight section (14), the upper contraction section (13) and the upper straight section (12) are communicated in sequence.
9. Use of the powder delivery device of claim 1, comprising:
step one, introducing flue gas into the inlet, wherein the flow velocity of the flue gas is V y Flue gas flow of m g ；
Step two, introducing purge gas into the purge pipeline (20), wherein the speed of the purge gas is V c ；
Thirdly, powder is conveyed into the lifting pipeline (10) through the feeding pipeline (30) at a feeding speed of V s And a particle diameter of D s Powder flow of m s ；
Wherein the diameter of a throat (19) between the lower contraction section (16) and the expansion section (15) is D, the corresponding solid-gas ratio theta is 0.1-10, V is y 、V c 、V s 、D s And D satisfies the following relationship:
V c ＝0.3V y
V s ＝0.1V y
V y ＝2V 0
m s ＝θm g
in the formula: v 0 : the free suspension velocity (m/s) of the particles;
D s : the diameter (m) of the particles;
ρ s : density of granules (kg/m) 3 )；
ρ: density of flue gas (kg/m) 3 )；
C: a coefficient of drag;
g: acceleration of gravity (m/s) 2 )。
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| CN112555568A (en) * | 2020-11-05 | 2021-03-26 | 山西中永通机电设备制造有限公司 | Pipeline type conveying device for realizing uniform-speed homogeneous fluid transportation and application method |
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