CN113355137B - Material returning device of circulating fluidized bed - Google Patents
Material returning device of circulating fluidized bed Download PDFInfo
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- CN113355137B CN113355137B CN202110657953.5A CN202110657953A CN113355137B CN 113355137 B CN113355137 B CN 113355137B CN 202110657953 A CN202110657953 A CN 202110657953A CN 113355137 B CN113355137 B CN 113355137B
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- pipe section
- feeding pipe
- air
- fluidized bed
- air supply
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- 239000000463 material Substances 0.000 title claims abstract description 148
- 239000007787 solid Substances 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims description 23
- 238000005507 spraying Methods 0.000 claims description 20
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 239000003245 coal Substances 0.000 description 16
- 238000002309 gasification Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000001311 chemical methods and process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
- C10J3/56—Apparatus; Plants
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention provides a material returning device of a circulating fluidized bed, which comprises a material returning pipeline and a jet flow air supply structure; the material returning pipeline is provided with a material inlet and a material outlet which are oppositely arranged, the material inlet is used for being communicated with a solid outlet of the gas-solid separator of the fluidized bed, and the material outlet is used for being communicated with the material returning port of the fluidized bed; the jet flow air supply structure is arranged in the material returning pipeline and is used for jetting air flow into the material returning pipeline so as to drive the material to flow. According to the technical scheme, after materials enter the inner cavity of the material returning pipeline, air flow is sprayed into the material returning pipeline through the jet flow air supply structure, rolled materials move along with the air flow and enter the material returning port of the fluidized bed from the discharge port, so that circulation of the fluidized bed materials is completed, the jet flow air supply structure drives the materials to move, the phenomenon that the materials flow in the material returning pipeline is unsmooth, circulation smoothness is guaranteed, and due to the fact that the air flow direction of the material returning pipeline is too high, the situations that the materials cannot be conveyed, and blowby gas in the material returning pipeline occurs due to the fact that the pressure in the fluidized bed is too high are prevented.
Description
Technical Field
The invention relates to the field of fluidized bed equipment, in particular to a material returning device of a circulating fluidized bed.
Background
Coal gasification is one of the core technologies of clean and efficient utilization technologies of coal, and is the basis for developing coal chemical process industries such as coal-based chemicals, coal-based clean fuels, industrial fuel gas, poly-generation systems and the like. The circulating fluidized bed coal gasification technology has the advantages of strong adaptability of coal types, simple coal preparation system, low manufacturing cost, environmental protection, high gasification strength and the like, and has been widely applied to the reformation of industrial fuel gas and synthetic ammonia in recent years.
The material returning device is a main component of the circulating fluidized bed gasification system, and the operation stability of the material returning device is related to the stability of the circulating fluidized bed gasification system, the efficiency of the gas-solid separator, the temperature distribution and the load. Wherein the U-shaped material returning device is the most common material returning device of the circulating fluidized bed. However, because the circulating fluidized bed gasifier has large circulating flow rate, high particle concentration and more severe turbulence, the U-shaped material returning device is easy to generate blowby gas and unstable in operation, especially, as the operating pressure of the circulating fluidized bed is increased, the particle concentration above a material returning port is higher, the resistance of a gas-solid separator is higher, the circulating flow rate is larger, and the U-shaped material returning device has the problems of unstable system operation and insufficient material returning flow rate due to the blowby gas.
Disclosure of Invention
The invention mainly aims to provide a returning device of a circulating fluidized bed, and aims to solve the problem of unstable returning operation of a returning device.
In order to achieve the above object, the present invention provides a return device for a circulating fluidized bed, comprising:
the material returning pipeline is provided with a material inlet and a material outlet which are oppositely arranged, the material inlet is used for being communicated with the solid outlet of the fluidized bed, and the material outlet is used for being communicated with the material returning port of the fluidized bed; and
The jet flow air supply structure is arranged in the material returning pipeline and is used for jetting air flow into the material returning pipeline so as to drive the material to flow.
Optionally, the return conduit comprises:
the feeding pipe section extends up and down, and the upper end of the feeding pipe section is provided with a feeding port in a penetrating way;
The connecting pipe section extends horizontally and is provided with a first connecting end and a second connecting end which are oppositely arranged, and the first connecting end is communicated with the lower end of the feeding pipe section; and
And the feeding pipe section extends up and down, the upper end of the feeding pipe section is provided with a discharge hole in a penetrating way, and the lower end of the feeding pipe section is communicated with the second connecting end.
Optionally, a connecting port is formed in the inner side wall of the lower end of the feeding pipe section in a penetrating manner;
The first connecting end is communicated into the connecting port;
the jet air supply structure comprises a first jet air supply device, the first jet air supply device is mounted on the inner side wall of the feeding pipe section and corresponds to the connection port, and an air outlet of the first jet air supply device is arranged towards the connection pipe section.
Optionally, the jet air supply structure further includes a plurality of second jet air supply devices, the plurality of second jet air supply devices are arranged along the circumferential interval of the inner cavity section of the connecting pipe section, and the air outlet of each second jet air supply device is arranged towards the second connecting end.
Optionally, the cross-sectional diameter of the inner cavity of the connecting pipe section is gradually increased along the direction from the first connecting end to the second connecting end.
Optionally, the jet air supply structure further comprises an air distribution device, the air distribution device is mounted at the bottom of the feeding pipe section, and an air outlet of the air distribution device is arranged towards the upper end of the feeding pipe section, so that fluidization of materials entering the feeding pipe section is achieved.
Optionally, a conical groove is concavely arranged on the lower side wall of the feeding pipe section;
The air distribution device is arranged on the bottom wall surface of the conical groove.
Optionally, the jet air supply structure further comprises a plurality of jet air pipes, the plurality of jet air pipes are mounted on the lower side wall of the feeding pipe section, the plurality of jet air pipes are arranged at intervals along the circumference of the lower side wall of the feeding pipe section and are arranged around the air distribution device, air holes are formed in each jet air pipe, air outlets of the air holes are all arranged towards the bottom of the feeding pipe section, and air flows sprayed by the air holes are uniformly dispersed through bottom materials.
Optionally, the jet air supply structure further comprises a plurality of secondary air spraying devices, the plurality of secondary air spraying devices are arranged at intervals along the circumferential direction of the section of the inner cavity of the feeding pipe section, and the air outlet of each secondary air spraying device is arranged towards the upper end of the feeding pipe section.
Optionally, a first guiding inclined plane is formed on the inner side wall of the lower end of the feeding pipe section, and the first guiding inclined plane is obliquely arranged from top to bottom towards the connecting pipe section; and/or,
The second connecting end is provided with a second guiding inclined plane on the inner side wall, and the second guiding inclined plane is obliquely arranged upwards from the first connecting end to the second connecting end.
According to the technical scheme provided by the invention, the material inlet of the material returning pipeline is communicated to the solid outlet of the fluidized bed so as to receive materials in the fluidized bed, after the materials enter the inner cavity of the material returning pipeline, air flow is sprayed into the material returning pipeline through the jet flow air supply structure, the rolled materials move along with the air flow and enter the material returning port of the fluidized bed from the material outlet so as to complete the circulation of the materials of the fluidized bed, the jet flow air supply structure drives the materials to move, the phenomenon that the materials flow in the material returning pipeline is not smooth is avoided, the circulation smoothness is ensured, and the occurrence of the conditions that the materials cannot be conveyed, the air is blown into the material returning pipeline and the like due to the fact that the pressure in the fluidized bed is too high is prevented.
Drawings
FIG. 1 is a schematic diagram showing the front view of a return device of a circulating fluidized bed according to an embodiment of the present invention;
FIG. 2 is a schematic top view of the return device of the circulating fluidized bed of FIG. 1;
FIG. 3 is a schematic top view of a second embodiment of a return device for a circulating fluidized bed according to the present invention;
FIG. 4 is a schematic front view of a third embodiment of a return device for a circulating fluidized bed according to the present invention;
FIG. 5 is a schematic elevational view of a fourth embodiment of a return device for a circulating fluidized bed according to the present invention;
Fig. 6 is a schematic front view of a fifth embodiment of a return device of a circulating fluidized bed according to the present invention.
Reference numerals illustrate:
| Reference numerals | Name of the name | Reference numerals | Name of the name |
| 100 | Material returning device of circulating fluidized bed | 21 | First jet air supply device |
| 1 | Material returning pipeline | 22 | Second jet air supply device |
| 11 | Feeding pipe section | 23 | Air distribution device |
| 111 | First guiding inclined plane | 24 | Jet air pipe |
| 12 | Connecting pipe section | 25 | Secondary air spraying device |
| 121 | Second guiding inclined plane | a | Feed inlet |
| 13 | Feeding pipe section | b | Discharge port |
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
In the case where a directional instruction is involved in the embodiment of the present invention, the directional instruction is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional instruction is changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Coal gasification is one of the core technologies of clean and efficient utilization technologies of coal, and is the basis for developing coal chemical process industries such as coal-based chemicals, coal-based clean fuels, industrial fuel gas, poly-generation systems and the like. The circulating fluidized bed coal gasification technology has the advantages of strong adaptability of coal types, simple coal preparation system, low manufacturing cost, environmental protection, high gasification strength and the like, and has been widely applied to the reformation of industrial fuel gas and synthetic ammonia in recent years.
The material returning device is a main component of the circulating fluidized bed gasification system, and the operation stability of the material returning device is related to the stability of the circulating fluidized bed gasification system, the efficiency of the gas-solid separator, the temperature distribution and the load. Wherein the U-shaped material returning device is the most common material returning device of the circulating fluidized bed. However, because the circulating fluidized bed gasifier has large circulating flow rate, high particle concentration and more severe turbulence, the U-shaped material returning device is easy to generate blowby gas and unstable in operation, especially, as the operating pressure of the circulating fluidized bed is increased, the particle concentration above a material returning port is higher, the resistance of a gas-solid separator is higher, the circulating flow rate is larger, and the U-shaped material returning device has the problems of unstable system operation and insufficient material returning flow rate due to the blowby gas.
The invention provides a returning device of a circulating fluidized bed, which aims to solve the problem of unstable returning operation of a returning device, wherein fig. 1 to 6 are embodiments provided by the invention.
Referring to fig. 1 to 2, the present invention provides a material returning device 100 of a circulating fluidized bed, which includes a material returning pipe 1 and a jet air supply structure; the material returning pipeline 1 is provided with a material inlet a and a material outlet b which are oppositely arranged, wherein the material inlet a is used for being communicated with a fluidized bed solid outlet, and the material outlet b is used for being communicated with the fluidized bed material returning opening; the jet flow air supply structure is arranged in the material returning pipeline 1 and is used for jetting air flow into the material returning pipeline 1 so as to drive the material to flow.
According to the technical scheme provided by the invention, the material inlet a of the material returning pipeline 1 is communicated to the solid outlet of the fluidized bed so as to receive materials in the fluidized bed, after the materials enter the inner cavity of the material returning pipeline 1, air flow is sprayed into the material returning pipeline 1 through the jet flow air supply structure, the rolled materials move along with the air flow and enter the material returning opening of the fluidized bed from the material outlet b, so that the circulation of the materials of the fluidized bed is completed, the material is driven to move through the jet flow air supply structure, the unsmooth flow of the materials in the material returning pipeline 1 is avoided, the smooth circulation is ensured, and the situations that the materials cannot be conveyed, and the gas is leaked into the material returning pipeline due to the fact that the pressure in the fluidized bed is too high are prevented due to the air flow direction of the material returning pipeline 1.
The material returning pipeline 1 is arranged in various ways, and only needs to ensure that a solid outlet and a material returning port of the fluidized bed are communicated, specifically, in this embodiment, the material returning pipeline 1 comprises a material feeding pipe section 11, a connecting pipe section 12 and a material feeding pipe section 13; the feeding pipe section 11 extends up and down, and a feeding port a is formed in the upper end of the feeding pipe section 11 in a penetrating manner; the connecting pipe section 12 extends horizontally, the connecting pipe section 12 is provided with a first connecting end and a second connecting end which are oppositely arranged, and the first connecting end is communicated with the lower end of the feeding pipe section 11; the feeding pipe section 13 extends up and down, the upper end of the feeding pipe section 13 is provided with a discharge hole b in a penetrating mode, and the lower end of the feeding pipe section 13 is communicated to the second connecting end. The material returning pipeline 1 is formed by the feeding pipeline section 11, the connecting pipeline section 12 and the feeding pipeline section 13, the material naturally falls from the solid discharge port of the fluidized bed and can fall into the material returning pipeline 1, and the material falling into the material returning pipeline 1 is driven by the jet flow air supply structure, so that the conveying of the material in the material returning pipeline 1 is ensured, and the structure is simple and reliable.
In this embodiment, the length-to-diameter ratio of the connecting pipe section 12 is 2 to 5; in addition, the aspect ratio of the feed pipe section 13 is 1.5 to 3. The diameter of the feeding pipe section 13 is 1.25 to 4 times of the diameter of the feeding pipe section 11, so that the material can flow in the feeding pipeline 1 more smoothly; the reverse pressure difference capacity of the stable operation of the return pipeline 1 is improved.
Furthermore, a connecting port is penetrated on the inner side wall of the lower end of the feeding pipe section 11; the first connecting end is communicated into the connecting port; the jet air supply structure comprises a first jet air supply device 21, wherein the first jet air supply device 21 is arranged on the inner side wall of the feeding pipe section 11 and corresponds to the connection port, and an air outlet of the first jet air supply device 21 is arranged towards the connection pipe section 12. After the material falls into the feeding pipe section 11, in order to facilitate the material to quickly enter the connecting pipe section 12 and circulate, the first jet air supply device 21 drives the material to move towards the connecting pipe section 12, so as to prevent the material from accumulating in the feeding pipe section 11.
It should be noted that, the distance between the center of the air outlet of the first jet air supply device 21 and the lower end face of the inner cavity of the connecting pipe section 12 is 0 to 2/3 times the diameter of the connecting pipe section 12; the diameter of the air outlet of the first jet air supply device 21 is 1/5 to 1/10 of the diameter of the connecting pipe section 12; the air outlet speed of the first jet air supply device 21 is 5 to 60m/s, and in this embodiment, the air speed is kept at 10 to 30m/s.
On the other hand, the jet air supply structure further comprises a plurality of second jet air supply devices 22, the second jet air supply devices 22 are arranged at intervals along the circumferential direction of the inner cavity section of the connecting pipe section 12, and the air outlet of each second jet air supply device 22 is arranged towards the second connecting end. After the material enters the horizontal section, the material is quickly pushed to the second connecting end through a plurality of second jet air supply devices 22, so that the material enters the feeding pipe section 13 and enters the fluidized bed material returning port for circulation.
Further, the plurality of second jet air supply devices 22 together form a plurality of horizontal jet groups, and the plurality of horizontal jet groups are arranged at intervals along the horizontal direction of the connecting pipe section 12. Thereby enabling faster delivery rates of the connected pipe segments 12.
In the present embodiment, two second jet air supply devices 22 are provided, and the two jet air supply devices 22 are located in the same horizontal plane; specifically, the distance between the two jet devices and the lower end face of the inner cavity of the connecting pipe section 12 is 0 to 2/3 times of the diameter of the connecting pipe section 12, and it should be noted that an inclination angle is formed between the air outlet direction of the second jet air supply device 22 and the axis of the connecting pipe section 12, and the inclination angle is 15 ° to 60 °; the air outlet caliber of the second jet air supply device 22 is 1/5 to 1/10 of the diameter of the connecting pipe section 12; the air outlet speed of the second jet air supply device 22 is 5 to 60m/s, and in this embodiment, the air speed is kept at 10 to 30m/s.
Referring to fig. 3, in an embodiment of the present invention, the cross-sectional diameter of the inner cavity of the connecting pipe section 12 is gradually increased along the direction from the first connecting end to the second connecting end. The resistance of the feeding pipe section 11 to the feeding pipe section 13 is reduced, and the structure is smoother.
In addition, the jet air supply structure further comprises an air distribution device 23, the air distribution device 23 is arranged at the bottom of the feeding pipe section 13, and an air outlet of the air distribution device 23 is arranged towards the upper end of the feeding pipe section 13, so that fluidization of materials entering the feeding pipe section is realized. The material from the connecting pipe section 12 is quickly returned into the fluidized bed, so that the material is prevented from being accumulated in the feeding pipe section 13 due to insufficient ascending power, the conveying pressure of the material into the fluidized bed is increased through the air distribution device 23, and the conditions of air blow-by and incapability of pressing in the material are prevented.
Further, the air distribution device 23 includes an air duct and a hood. In the embodiment provided by the invention, the air distribution device 23 comprises a jet nozzle.
The apparent wind speed of the feed pipe section 13 is 0.2m/s to 1m/s. So as to drive the material to rise.
Further, referring to fig. 4, in an embodiment of the present invention, a conical groove is concavely formed at the bottom of the feeding pipe section 13; the air distribution device 23 is arranged on the bottom wall surface of the conical groove. The air flow is sprayed into the feeding pipe section 13 through the air outlet of the air distribution device 23, and the entrainment and negative pressure area is formed along the conical shape, so that the material returning flow rate and the reverse pressure difference capacity of the material returning pipeline 1 are improved.
Similarly, referring to fig. 5, in another embodiment of the present invention, the jet air supply structure further includes a plurality of jet air pipes 24, the plurality of jet air pipes 24 are mounted on the lower side wall of the feeding pipe section 13, the plurality of jet air pipes 24 are circumferentially spaced along the lower side wall of the feeding pipe section 13 and are arranged around the air distribution device 23, each jet air pipe 24 is provided with an air hole, the air outlets of the air holes are all arranged towards the bottom of the feeding pipe section 13, and the air flows ejected from the air holes are uniformly dispersed by the bottom material. Through the jet air pipe 24, the same effect as the conical groove is formed, the formed entrainment and negative pressure area improves the material returning flow rate and the reverse pressure difference capacity of the material returning pipeline 1, and simultaneously, the structure of the material feeding pipe section 13 is simple and reliable, and the installation and the maintenance are convenient. In the present embodiment, the air outlet speed of the air distribution device 23 is 20m/s to 60m/s, and the air speed generated by the plurality of jet air pipes 24 is 0.1 to 0.2m/s.
In addition, the jet air supply structure further comprises a plurality of secondary air spraying devices 25, the plurality of secondary air spraying devices 25 are arranged at intervals along the circumferential direction of the inner cavity section of the feeding pipe section 13, and the air outlet of each secondary air spraying device 25 is arranged towards the upper end of the feeding pipe section 13. Likewise, the material is driven upwardly by the secondary air jets 25 to enter the fluidised bed.
It should be noted that, an included angle is formed between the air outlet direction of the plurality of secondary air-spraying devices 25 and the axis of the feeding pipe section 13, the included angle is 15 ° to 75 °, in this embodiment, the included angle of the plurality of secondary air-spraying devices 25 is kept to be 30 ° to 55 °, so as to bring about the best jet effect. The air outlet speed of the secondary air-jet device 25 is 5 to 30m/s.
In addition, a plurality of secondary air spraying devices jointly form an ascending air spraying group, a plurality of ascending air spraying groups are arranged, and a plurality of ascending air spraying groups are arranged at intervals along the vertical direction.
In order to reduce the obstruction of the material during movement, referring to fig. 6, a first guiding inclined surface 111 is formed on the inner side wall of the lower end of the feeding tube section 11, and the first guiding inclined surface 111 is inclined from top to bottom toward the connecting tube section 12. When the feeding pipe section 11 moves towards the connecting pipe section 12, the material directly slides into the connecting pipe section 12 through the first guide inclined plane 111, and then is conveyed into the feeding pipe section 13 through the connecting pipe section 12, so that the moving resistance of the material between the feeding pipe section 11 and the connecting pipe section 12 is reduced.
Similarly, a second guiding inclined plane 121 is formed on the inner side wall of the second connecting end, and the second guiding inclined plane 121 is inclined upwards from the first connecting end to the second connecting end. Since the material needs to be conveyed into the feeding pipe section 13 from the second connecting end and needs to move upwards, the second guiding inclined plane 121 ensures that the moving direction of the material is the same as the feeding direction of the feeding pipe section 13, so that the feeding pipe section 13 is convenient for conveying the material upwards.
It should be noted that, in implementation of the two related technical features of the first guiding inclined plane 111 and the second guiding inclined plane 121, the two related technical features may alternatively exist or may exist simultaneously, and in this embodiment, the simultaneous existence brings the best technical effect, so that the local moving direction of the material is the same as the overall conveying direction, which is convenient for conveying the material and reduces the conveying resistance.
The first guide angle between the first guide inclined surface 111 and the horizontal plane is in the range of 15 ° to 60 °; the second guide inclined surface 121 has a second guide angle with respect to the horizontal plane in the range of 30 ° to 75 °.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (6)
1. A return device for a circulating fluidized bed, comprising:
The material returning pipeline is provided with a material inlet and a material outlet which are oppositely arranged, the material inlet is used for being communicated to the solid outlet of the gas-solid separator of the fluidized bed, and the material outlet is used for being communicated to the material returning port of the fluidized bed; and
The jet flow air supply structure is arranged in the material returning pipeline and is used for jetting air flow into the material returning pipeline so as to drive the material to flow;
wherein, the returning charge pipeline includes:
the feeding pipe section extends along the up-down direction, and the upper end of the feeding pipe section is provided with the feeding port in a penetrating way;
The connecting pipe section extends in the horizontal direction and is provided with a first connecting end and a second connecting end which are oppositely arranged, and the first connecting end is communicated with the lower end of the feeding pipe section;
The feeding pipe section extends along the up-down direction, the upper end of the feeding pipe section is provided with the discharge hole in a penetrating mode, the lower end of the feeding pipe section is communicated with the second connecting end, and the diameter of the feeding pipe section is 1.25-4 times that of the feeding pipe section;
the jet air supply structure comprises:
The air distribution device is arranged at the bottom of the feeding pipe section, and an air outlet of the air distribution device is arranged towards the upper end of the feeding pipe section;
The air distribution device comprises a feeding pipe section, a plurality of air distribution devices, a plurality of air spraying pipes and an air outlet, wherein the air spraying pipes are arranged on the lower side wall of the feeding pipe section, the air spraying pipes are arranged along the circumferential interval of the lower side wall of the feeding pipe section and surround the air distribution devices, each air spraying pipe is provided with an air hole, and the air outlets of the air holes are all arranged towards the bottom of the feeding pipe section.
2. The circulating fluidized bed returning apparatus of claim 1, wherein a connection port is formed in the inner side wall of the lower end of the feeding pipe section;
the first connecting end is communicated into the connecting port;
The jet air supply structure comprises a first jet air supply device, the first jet air supply device is mounted on the inner side wall of the feeding pipe section and corresponds to the connection port, and an air outlet of the first jet air supply device faces the connection pipe section.
3. The return device of a circulating fluidized bed of claim 1, wherein the jet air supply structure further comprises a plurality of second jet air supply devices, the second jet air supply devices are arranged at intervals along the circumferential direction of the cross section of the inner cavity of the connecting pipe section, and the air outlet of each second jet air supply device is arranged towards the second connecting end.
4. The return device of a circulating fluidized bed of claim 1, wherein the cross-sectional diameter of the inner cavity of the connecting pipe section is gradually increased along the direction from the first connecting end to the second connecting end.
5. The circulating fluidized bed return device of claim 1, wherein the jet air supply structure further comprises a plurality of secondary air spraying devices, the secondary air spraying devices are arranged at intervals along the circumferential direction of the section of the inner cavity of the feeding pipe section, and the air outlet of each secondary air spraying device is arranged towards the upper end of the feeding pipe section.
6. The return device of a circulating fluidized bed of claim 1, wherein a first guiding inclined surface is formed on the inner side wall of the lower end of the feeding pipe section, and the first guiding inclined surface is obliquely arranged from top to bottom towards the connecting pipe section; and/or,
The second guide inclined plane is formed on the inner side wall of the second connecting end and is obliquely arranged upwards from the first connecting end to the second connecting end.
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| CN202110657953.5A CN113355137B (en) | 2021-06-10 | 2021-06-10 | Material returning device of circulating fluidized bed |
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| CN202110657953.5A CN113355137B (en) | 2021-06-10 | 2021-06-10 | Material returning device of circulating fluidized bed |
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| CN113355137B true CN113355137B (en) | 2024-07-09 |
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| CN201046952Y (en) * | 2007-05-31 | 2008-04-16 | 宋建元 | Coal gasification device of circulating fluidized bed |
| CN208687717U (en) * | 2018-07-25 | 2019-04-02 | 贵州赤天化纸业股份有限公司 | Thermoelectricity coal burning boiler loopback dust-extraction unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI873735A0 (en) * | 1987-08-28 | 1987-08-28 | Ahlstroem Oy | FOERFARANDE OCH ANORDNING FOER FOERGASNING AV FAST KOLHALTIGT MATERIAL. |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1614306A (en) * | 2004-11-11 | 2005-05-11 | 华中科技大学 | Sealed fluid back-feeder |
| CN201046952Y (en) * | 2007-05-31 | 2008-04-16 | 宋建元 | Coal gasification device of circulating fluidized bed |
| CN208687717U (en) * | 2018-07-25 | 2019-04-02 | 贵州赤天化纸业股份有限公司 | Thermoelectricity coal burning boiler loopback dust-extraction unit |
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| CN113355137A (en) | 2021-09-07 |
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