CN115506892A - Staged fluidized structure of pulverized fuel supply system - Google Patents
Staged fluidized structure of pulverized fuel supply system Download PDFInfo
- Publication number
- CN115506892A CN115506892A CN202211065919.XA CN202211065919A CN115506892A CN 115506892 A CN115506892 A CN 115506892A CN 202211065919 A CN202211065919 A CN 202211065919A CN 115506892 A CN115506892 A CN 115506892A
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- Prior art keywords
- fluidization
- staged
- gas
- pulverized fuel
- grading
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- 239000000446 fuel Substances 0.000 title claims abstract description 53
- 238000005243 fluidization Methods 0.000 claims abstract description 117
- 239000006185 dispersion Substances 0.000 claims abstract description 26
- 239000007787 solid Substances 0.000 claims abstract description 9
- 230000005514 two-phase flow Effects 0.000 claims abstract description 8
- 230000000153 supplemental effect Effects 0.000 claims 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000010902 straw Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract description 23
- 239000002245 particle Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/26—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being solid or pulverulent, e.g. in slurry or suspension
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K7/00—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/70—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using semi- solid or pulverulent propellants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R5/00—Continuous combustion chambers using solid or pulverulent fuel
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Abstract
The present application provides a staged fluidization structure of a pulverized fuel supply system, comprising: the inner space of the grading fluidization cover forms a fluidization cavity, and a dispersion space is formed between the rear seal head and the grading fluidization cover; a porous annular distribution flow passage is arranged in the rear end enclosure, and gas enters the rear end enclosure, is subjected to primary dispersion through the porous annular distribution flow passage and then enters the dispersion space; the gas passes through the dispersion space, then passes through the grading fluidization cover to be secondarily dispersed, and then enters the fluidization cavity; the rectification throat is used for rectifying and conveying gas-solid two-phase flow formed by gas and powder fuel in the fluidization cavity. The hierarchical fluidization structure of the pulverized fuel supply system effectively improves the fluidization conveying capacity of the pulverized fuel supply system to the pulverized fuel through the design of the hierarchical fluidization structure, and avoids the condition that the powder is compacted; the design of the hierarchical fluidization structure increases the volume of the fluidization cavity and improves the filling rate of the pulverized fuel under the condition that the length of the storage tank is not changed.
Description
Technical Field
The application relates to the field of powder engines, in particular to a graded fluidization structure of a powder fuel supply system.
Background
The efficient fluidization of the pulverized fuel is the premise and the basis of stable supply of the flow of the pulverized fuel, and is the key of stable output of the thrust of the pulverized fuel engine. At present, the powder fuel supply system generally adopts a mode of pushing powder by a piston and fluidizing the conical surface of an outlet of a storage tank. However, in this way, when the pulverized fuel moves from the cylindrical section of the storage tank to the conical section of the outlet, the accumulation is easily formed at the boundary position of the two sections, so that the resistance of the piston for pushing the pulverized fuel is increased, the deviation of the parameters of the powder supply system is caused, the pulverized fuel is compacted, the fluidized delivery is difficult to carry, even the piston is blocked, the pulverized fuel cannot move forwards, and the stable output of the thrust of the powder engine is not facilitated.
Disclosure of Invention
To overcome at least one of the deficiencies in the prior art, embodiments of the present application provide a staged fluidization structure for a pulverized fuel supply system.
In a first aspect, embodiments of the present application provide a staged fluidization structure of a pulverized fuel supply system, including: the inner space of the grading fluidization cover forms a fluidization cavity, and a dispersion space is formed between the rear seal head and the grading fluidization cover;
a porous annular distribution flow passage is arranged in the rear end enclosure, and gas enters the rear end enclosure, is subjected to primary dispersion through the porous annular distribution flow passage and then enters the dispersion space;
the gas passes through the dispersion space, then passes through the grading fluidization cover to be secondarily dispersed, and then enters the fluidization cavity;
the rectification throat is used for rectifying and conveying gas-solid two-phase flow formed by gas and powdered fuel in the fluidization cavity.
In one embodiment, the porous annular distribution flow passage has an annular structure, and at least one circle of the first air inlet holes is distributed on the annular structure.
In one embodiment, the number n and the aperture d of the first intake holes per one turn of the first intake holes satisfy the following relationship: 0.2D/D < n <0.3D/D and 30< -D/D <60, wherein D is the internal diameter of the storage tank.
In one embodiment, the graded fluidization cover is provided with a plurality of second air inlets, and the axial distance L between the first air inlets and the second air inlets which are adjacent along the axial direction of the graded fluidization cover satisfies the following relation: 3d < -L < -5 d, wherein d is the aperture of the first air inlet hole.
In one embodiment, the rear end enclosure is provided with an air inlet, the porous annular distribution flow channel is provided with a plurality of first air inlet holes, air flow enters the rear end enclosure through the air inlet, and the axis of the air inlet and the axis of the first air inlet holes form an included angle of 90 degrees.
In one embodiment, the graded fluidization hood comprises a resistance-reducing fluidization area, a fastest fluidization area and a supplementary fluidization area, the three areas are sequentially arranged along the axial direction of the graded fluidization hood, the resistance-reducing fluidization area is located at the junction of the cylindrical section and the convergent section of the storage tank, the fastest fluidization area has a fluidization curved surface structure, and the supplementary fluidization area is located at the outlet of the storage tank.
In one embodiment, the graded fluidization cover is provided with a plurality of second air inlet holes, and the aperture of the plurality of second air inlet holes is gradually reduced in an arithmetic progression along the axis of the graded fluidization cover and along the outlet direction of the storage tank.
In one embodiment, the inlet angle α of the rectifying throat satisfies the following relationship: 45 ° < α <75 °, the exit angle β of the rectification throat satisfies the following relationship: 20 ° < β <30 °.
Compared with the prior art, the method has the following beneficial effects:
(1) The fluidization conveying capacity of the powder supply system to the powder fuel is effectively improved through the design of the hierarchical fluidization structure, and the condition that the powder is compacted is avoided.
(2) The design of the hierarchical fluidization structure increases the volume of the fluidization cavity and improves the filling rate of the pulverized fuel under the condition that the length of the storage tank is not changed.
Drawings
The present application may be better understood by reference to the following description taken in conjunction with the accompanying drawings, which are incorporated in and form a part of this specification, and the following detailed description. In the drawings:
FIG. 1 shows a schematic view of a prior art pulverized fuel feed system without a staged fluidization structure;
FIG. 2 shows a schematic diagram of a pulverized fuel feed system having a staged fluidization structure in accordance with an embodiment of the present application;
FIG. 3 illustrates a cross-sectional view of a back head and a porous annular distribution flow passage in accordance with an embodiment of the present application;
FIG. 4 shows a half sectional view of a staged fluidization shield in accordance with an embodiment of the present application.
Reference numerals:
1-a high-pressure gas cylinder, 2-a pressure reducing valve, 3-an electric explosion valve, 4-a driving cavity, 5-a piston, 6-powdered fuel, 7-a rear end socket, 8-a porous annular distribution flow channel, 9-a grading fluidization cover, 10-a fluidization cavity, 11-a rectification throat, 12-a storage tank, 13-a conical fluidization cover, 14-a dispersion space, 15-a first gas inlet and 16-a second gas inlet.
Detailed Description
Exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual embodiment are described in the specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions may be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another.
Here, it should be further noted that, in order to avoid obscuring the present application with unnecessary details, only the device structure closely related to the solution according to the present application is shown in the drawings, and other details not so related to the present application are omitted.
It is to be understood that the application is not limited to the described embodiments by the following description with reference to the drawings. In this context, embodiments may be combined with each other, features may be replaced or borrowed between different embodiments, one or more features may be omitted in one embodiment, where feasible.
Fig. 1 shows a schematic view of a prior art pulverized fuel feed system without a staged fluidization structure. In the non-stage fluidization structure shown in fig. 1, gas directly enters from the gas inlet on the rear head 7, is then dispersed by the conical fluidization hood 13, and then is used for fluidizing the pulverized fuel 6 in the fluidization cavity 10 and directly delivering the pulverized fuel out of the pulverized fuel supply system. Since the gas enters the rear end enclosure through only one gas inlet, the gas cannot be uniformly dispersed by the conical fluidization hood 13, and meanwhile, no gas inlet is arranged at the junction of the storage tank 12 and the conical fluidization hood 13, so that the powdered fuel is easy to accumulate at the junction and is easy to compact under the pushing action of the piston 5. Furthermore, the conical structure of the conical fluidization cap 13 allows the volume of the fluidization chamber 10 to be reduced, which is detrimental to increasing the powder filling rate of the powder fuel supply system. A further problem with the conical fluidization shield 13 is that the inlet holes in the conical surface are of uniform size along the axis, but the pulverized fuel at the outlet is minimized, so that the inlet holes at the outlet are more effective in fluidizing the pulverized fuel, while the inlet holes at the inner side are less effective in fluidizing the pulverized fuel, which in turn hinders the movement of the pulverized fuel towards the outlet. It is verified that under this scheme, the pulverized fuel is easily compacted during the feeding process.
Referring to fig. 2, the staged fluidization structure of the pulverized fuel supply system according to the embodiment of the present application includes: the device comprises a rear seal head 7, a grading fluidization cover 9 and a rectification throat 11, wherein a fluidization cavity 10 is formed in the inner space of the grading fluidization cover 9, and a dispersion space 14 is formed between the rear seal head 7 and the grading fluidization cover 9; a porous annular distribution flow passage 8 is arranged in the rear end enclosure 7, and gas enters the rear end enclosure 7, is subjected to primary dispersion through the porous annular distribution flow passage 8 and then enters the dispersion space 14; the gas passes through the dispersing space 14, then passes through the grading fluidization cover 9 for secondary dispersion and then enters the fluidization cavity 19; the rectification throat 11 is used for rectifying and conveying gas-solid two-phase flow formed by gas and powdered fuel in the fluidization cavity 10.
In the embodiment, gas in a high-pressure gas cylinder 1 is divided into two paths after passing through a pressure reducing valve 2, one path of gas enters a driving cavity 4 after passing through an electro-explosive valve 3, a piston 5 is pushed to extrude powder fuel 6 to enter a fluidizing cavity 10, the other path of gas firstly enters a porous annular distribution flow passage 8 of a rear end socket 7 to be subjected to primary dispersion, then the gas enters a dispersion space 14 formed between the rear end socket 7 and a grading fluidizing cover 9, the gas uniformly passes through the grading fluidizing cover 9 in the dispersion space 14 along the circumferential direction of a storage tank 12, the grading fluidizing cover 9 is used for performing secondary dispersion with gradient change on the gas, after the gas subjected to secondary dispersion enters the fluidizing cavity 10, grading fluidization on the powder fuel in the fluidizing cavity 10 is realized, so that the gas and the powder fuel can form more uniform gas-solid two-phase flow, and finally the formed gas-solid two-phase flow forms gas-solid two-phase jet flows which are uniformly distributed in a pipeline after passing through a rectification throat 11 and are conveyed to the environment of a downstream engine combustion chamber.
In one embodiment, the porous annular distribution flow passage 8 has an annular structure, at least one circle of the first gas inlet holes 15 are distributed on the annular structure, and the gas is dispersed into the dispersion space 14 by the first gas inlet holes 15. Preferably, 2 circles of the first air inlet holes 15 are distributed on the annular structure, and in order to ensure that the gas is uniformly dispersed in the circumferential direction, enough number of air inlet holes with small diameter must be provided, but the excessive number of air inlet holes with small diameter can increase the pressure drop loss of the gas flow, so that the number n and the diameter d of the first air inlet holes 15 in each circle of the first air inlet holes 15 satisfy the following relation: 0.2D/D < n <0.3D/D and 30< -D/D <60, wherein D is the internal diameter of the tank.
In one embodiment, referring to fig. 2 and 3, the classifying fluidization cover 9 is provided with a plurality of second air inlets 16, so as to ensure that two paths of air do not interfere with each other and the circumferential dispersion is uniform within the shortest axial distance, the axial distance L between the adjacent first air inlets 15 and the adjacent second air inlets 16 along the axial direction of the classifying fluidization cover 9 satisfies the following relationship: 3d are woven L-woven 5d, wherein d is the aperture of the first air intake holes 15.
In one embodiment, the rear end enclosure 7 is provided with an air inlet, the porous annular distribution flow passage 8 is provided with a plurality of first air inlet holes 15, air flow enters the rear end enclosure 7 through the air inlet, and the axis of the air inlet and the axis of the first air inlet holes 15 form an included angle of 90 degrees. In this embodiment, the axis of the air inlet and the axis of the first air inlet hole 15 form an included angle of 90 °, so that the air can uniformly enter from each first air inlet hole 15 of the porous annular distribution flow channel 8, and one-time uniform dispersion of the air is realized.
In one embodiment, referring to fig. 4, the staged fluidization hood 9 includes a drag-reducing fluidization region located at the junction of the cylindrical section and the convergent section of the storage tank 12, a fastest fluidization region having a fluidized curved surface structure, and a supplementary fluidization region located at the outlet of the storage tank 12, which are sequentially arranged along the axial direction of the staged fluidization hood. In the embodiment, gas enters the fluidization cavity 10 through the drag reduction fluidization area, the fastest fluidization area and the supplementary fluidization area of the graded fluidization hood 9 respectively to carry out fluidization delivery on the powdered fuel; the resistance-reducing fluidization area is positioned at the junction of the cylindrical section and the convergent section of the storage tank 12, so that the accumulation of the powdered fuel can be avoided, the resistance of the piston for pushing the powder is reduced, and the powdered fuel is prevented from being compacted; the fastest fluidization region is a fluidization curved surface designed according to the fastest curve, the speed of the particles moving on the fastest curved surface is fastest according to the fastest principle, the speed of the particles being conveyed out of the storage tank can be increased, the particles are prevented from being blocked at the position, and the volume of the fluidization cavity is increased by the fastest curved surface design, so that the filling rate of the powder fuel is improved; the purpose of the post-fluidization region is to further accelerate the flow of pulverized fuel out of tank 12 and to prevent the pulverized fuel from becoming clogged at the outlet of tank 12.
In one embodiment, the classifying fluidization hood 9 is provided with a plurality of second air inlet holes 16, and the aperture of the plurality of second air inlet holes 16 is gradually reduced in an arithmetic progression along the axis of the classifying fluidization hood 9 and along the outlet direction of the storage tank 12. In this embodiment, the apertures of the second air intake holes 16 are gradually reduced in an equal-difference array, so as to avoid the situation that the air flow velocity at the outlet of the storage tank 12 is too high to block the powder fuel output storage tank 12.
In one embodiment, the inlet angle α of the rectifying throat 11 satisfies the following relationship: the angle alpha is 45 degrees < alpha <75 degrees, the rectification of gas-solid two-phase flow can be realized in a short distance, and the outlet angle beta of the rectification throat 11 satisfies the following relation: beta is less than 30 degrees, a particle-free area in the expansion section is avoided, and the uniform flow of gas-solid two-phase flow in a downstream pipeline is ensured.
In conclusion, the staged fluidization structure of the powder fuel supply system of the present application has the following beneficial effects:
(1) The fluidization conveying capacity of the powder supply system to the powder fuel is effectively improved through the design of the hierarchical fluidization structure, and the condition that the powder is compacted is avoided.
(2) The design of the hierarchical fluidization structure increases the volume of the fluidization cavity and improves the filling rate of the pulverized fuel under the condition that the length of the storage tank is not changed.
The above description is only for various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A staged fluidization structure for a pulverized fuel supply system, comprising: the device comprises a rear seal head (7), a grading fluidization cover (9) and a rectification throat (11), wherein a fluidization cavity (10) is formed in the inner space of the grading fluidization cover (9), and a dispersion space (14) is formed between the rear seal head (7) and the grading fluidization cover (9);
a porous annular distribution flow passage (8) is arranged in the rear end enclosure (7), and gas enters the rear end enclosure (7), is subjected to primary dispersion through the porous annular distribution flow passage (8) and then enters the dispersion space (14);
the gas passes through the dispersion space (14), is subjected to secondary dispersion by the grading fluidization cover (9) and then enters the fluidization cavity (10);
the rectification throat (11) is used for rectifying and conveying gas-solid two-phase flow formed by gas and powdered fuel in the fluidization cavity (10).
2. A staged fluidization structure according to claim 1, characterized in that said porous annular distribution channel (8) has an annular configuration, on which at least one ring of first air inlet holes (15) is distributed.
3. A staged fluidisation structure as claimed in claim 2, characterised in that the number n of first inlet holes (15) per turn of first inlet holes (15) and the aperture d satisfy the following relation: 0.2D/D < n <0.3D/D and 30 straw D/D <60, wherein D is the inner diameter of the tank (12).
4. A staged fluidization structure according to claim 2, wherein a plurality of second gas inlet holes (16) are provided in said staged fluidization shield (9), and the axial distance L between said first gas inlet holes (15) and said second gas inlet holes (16) adjacent in the axial direction of said staged fluidization shield (9) satisfies the following relationship: 3 d-l-woven 5d, wherein d is the aperture of the first air intake holes (15).
5. The staged fluidization arrangement according to claim 1, wherein an air inlet is provided in said back head (7), a plurality of first air inlets (15) are provided in said porous annular distribution channel (8), said air stream enters said back head (7) through said air inlet, and the axis of said air inlet forms an angle of 90 ° with the axis of said first air inlets (15).
6. A staged fluidization structure according to claim 1, wherein said staged fluidization shield (9) comprises a drag-reducing fluidization region, a fastest fluidization region and a supplemental fluidization region, said three regions being arranged in sequence along the axial direction of said staged fluidization shield (9), said drag-reducing fluidization region being located at the junction of the cylindrical section and the convergent section of the tank (12), said fastest fluidization region having a fluidization curved structure, and said supplemental fluidization region being located at the outlet of said tank (12).
7. A staged fluidization structure according to claim 1 or 6, wherein said staged fluidization hood (9) is provided with a plurality of second air inlet holes (16), the hole diameters of said plurality of second air inlet holes (16) decreasing in an equi-differential series along the axis of said staged fluidization hood (9) and in the direction of the outlet of the tank (12).
8. A staged fluidization structure according to claim 1, wherein the inlet angle α of said rectifying throat (11) satisfies the following relation: 45 ° < α <75 °, the exit angle β of the rectifying throat (11) satisfies the following relationship: 20 ° < β <30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211065919.XA CN115506892A (en) | 2022-09-01 | 2022-09-01 | Staged fluidized structure of pulverized fuel supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211065919.XA CN115506892A (en) | 2022-09-01 | 2022-09-01 | Staged fluidized structure of pulverized fuel supply system |
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| CN115506892A true CN115506892A (en) | 2022-12-23 |
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| CN202211065919.XA Pending CN115506892A (en) | 2022-09-01 | 2022-09-01 | Staged fluidized structure of pulverized fuel supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116025484A (en) * | 2023-02-28 | 2023-04-28 | 北京大学 | Continuous detonation solid rocket engine system based on solid powder |
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