CN214223091U

CN214223091U - Material returning device

Info

Publication number: CN214223091U
Application number: CN202022717219.7U
Authority: CN
Inventors: 岳站峰; 徐锋飞; 任孝明; 邵磊
Original assignee: Shanghai Industrial Boiler Wuxi Co ltd
Current assignee: Shanghai Industrial Boiler Wuxi Co ltd
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-09-17
Anticipated expiration: 2030-11-20

Abstract

The utility model relates to the technical field of boilers, in particular to a material returning device, wherein a material returning leg round tube is arranged downwards in an inclined way, the lower end of the material returning leg round tube is communicated with the inside of a hearth, the lower end of the material returning leg round tube is connected with the wall of the hearth in a sealing way through a sealing cover, one end of a connecting tube is communicated with a primary hot air channel of a boiler, the other end of the connecting tube is communicated with a main tube, one end of a spray tube is communicated with the main tube through a distribution tube, the other end of the spray tube is communicated with the inside of the hearth after passing through the wall of the lower end of the material returning leg round tube, a hand wheel valve is arranged on the distribution tube, high-strength castable wear-resistant I is respectively laid on the inner wall of the material returning leg round tube and the inner wall of the sealing cover, a high-strength castable wear-resistant I is formed in an inner cavity of the high-strength castable, a high-strength castable II is laid on the upper surface of the spray tube positioned in the ash returning channel, hot air is blown to returning ash through the spray tube, the return ash is uniformly dropped into the hearth, so that the fluidization effect is better, and the ash blocking probability of the lower end of the circular tube of the return leg is reduced.

Description

Material returning device

Technical Field

The utility model belongs to the technical field of the boiler technique and specifically relates to a returning charge device.

Background

For circulating fluidized bed boiler, inside the returning charge ash that produces need return furnace through returning charge leg pipe again during the burning, carry out cyclic utilization, among the prior art, the lower extreme disect insertion furnace of returning charge leg pipe, the returning charge ash relies on self gravity and flue gas velocity of flow to flow in furnace, after long-time work, the returning charge ash granule is piled up the bottom at returning charge leg pipe easily, causes the jam, influences the boiler normal operating.

SUMMERY OF THE UTILITY MODEL

The applicant provides a material returning device aiming at the defects in the prior art, so that the returned ash can uniformly fall into the hearth, the fluidization effect is good, and the ash blocking probability of the lower end of the circular tube of the material returning leg is reduced.

The utility model discloses the technical scheme who adopts as follows: a material returning device comprises a sealing cover shell and a material returning leg round tube, and comprises a connecting tube, a main tube, a hand wheel valve, a distributing tube and a spraying tube, the return leg circular tubes are arranged obliquely and downwards, the lower ends of the return leg circular tubes are communicated with the interior of the hearth, the lower ends of the return leg circular tubes are hermetically connected with the hearth wall through a sealing cover casing, the one end intercommunication boiler of connecting pipe, the other end intercommunication female pipe of connecting pipe, distributing pipe and female pipe intercommunication are passed through to the one end of spray tube, the other end of spray tube passes back and the inside intercommunication of furnace from the lower extreme pipe wall of return leg pipe, set up the hand wheel valve on the distributing pipe, return leg pipe inner wall, the inside wall of sealed housing is laid high strength wear-resisting castable one respectively, the inside cavity of high strength wear-resisting castable forms return ash material passageway, lie in the upper surface laying high strength wear-resisting castable two of the inside spray tube of return ash material passageway.

As a further improvement of the above technical solution:

the spray pipe is from the furnace outside to the inside slope of furnace and distribute down, and the distribution pipe includes that the upper end of vertical pipeline and vertical pipeline is to the one end intercommunication of lateral buckling back and spray pipe, and the middle section concatenation of the vertical pipeline of distribution pipe has the expansion joint, and female pipe level is arranged, and the lower extreme of vertical pipeline and the perpendicular intercommunication of lateral wall of female pipe.

The cross section of the spray pipe is rectangular, the plane of one long edge of the rectangular spray pipe is the upper surface of the spray pipe, the gradient of the upper surface of the high-strength wear-resistant castable material II is consistent with that of the spray pipe, and the edge of the upper end of the high-strength wear-resistant castable material II and the edge of the bottom of the lower port of the inner portion of the material return leg round pipe are integrally connected in an obtuse included angle mode.

The utility model has the advantages as follows: this application is through the connecting pipe, female pipe, a hot air duct and furnace's of boiler intercommunication is realized to distributing pipe and spray tube, return when the ash material gets into return leg round pipe inside, it relies on gravity to roll along the wear-resisting castable that excels in and the surface of wear-resisting castable two that excels in to fall out to return the ash material, hot-blast in the hot air duct of once blows to the return ash material through the spray tube blowout, make inside the even furnace that falls of return ash material, make the furnace temperature even, the temperature difference around the furnace bottom has been reduced, make the fluidization effect better. Meanwhile, the probability of ash blockage at the lower end of the round pipe of the material returning leg is reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Wherein: 1. a connecting pipe; 2. a main pipe; 3. an expansion joint; 4. a hand wheel valve; 5. a distribution pipe; 6. sealing the housing; 7. high-strength wear-resistant castable I; 8. a nozzle; 9. a return leg round tube; 10. a primary hot air duct; 11. a furnace wall; 12. an ash return channel; 13. and a second high-strength wear-resistant castable.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1-2, the material returning device of this embodiment includes a sealing housing 6 and a material returning leg circular tube 9, and includes a connecting tube 1, a main tube 2, a hand wheel valve 4, a distributing tube 5 and a spraying tube 8, the material returning leg circular tube 9 is disposed obliquely and downward, the lower end of the material returning leg circular tube 9 is communicated with the inside of the furnace chamber, the lower end of the material returning leg circular tube 9 is hermetically connected with the wall 11 of the furnace chamber through the sealing housing 6, one end of the connecting tube 1 is communicated with a primary hot air duct 10 of the boiler, the other end of the connecting tube 1 is communicated with the main tube 2, one end of the spraying tube 8 is communicated with the main tube 2 through the distributing tube 5, the other end of the spraying tube 8 is communicated with the inside of the furnace chamber after passing through the wall of the lower end of the material returning leg circular tube 9, the hand wheel valve 4 is disposed on the distributing tube 5, the inner wall of the material returning leg circular tube 9 and the inner wall of the sealing housing 6 are respectively paved with a high-strength wear-resistant castable one 7, an inner cavity of the high-resistant castable one 7 forms an ash returning channel 12, and a high-strength wear-resistant castable II 13 is paved on the upper surface of the spray pipe 8 positioned in the ash return channel 12. The sealing housing 6 is of an existing structure, the sealing housing 6 can be a box-shaped shell with an opening, the periphery of the opening end of the shell is fixed on the outer surface of the hearth wall 11, and the sealing housing 6 is filled with a high-strength wear-resistant castable material I7 and a channel is reserved inside the high-strength wear-resistant castable material I7 for returning ash to pass through.

Spray tube 8 distributes from the furnace outside to the inside slope of furnace down, and distribution pipe 5 includes vertical pipeline and vertical pipeline's upper end and the one end intercommunication of spray tube 8 behind to a lateral buckling, and the middle section concatenation of vertical pipeline of distribution pipe 5 has expansion joint 3, and female 2 horizontal arrangements, the lower extreme of vertical pipeline and the perpendicular intercommunication of lateral wall of female 2. The main pipe 2 can lead out a plurality of distributing pipes 5 according to actual needs.

The cross section of the spray pipe 8 is rectangular, the plane of one long side of the rectangle is the upper surface of the spray pipe 8, the gradient of the upper surface of the high-strength wear-resistant castable material II 13 is consistent with that of the spray pipe 8, and the upper end edge of the high-strength wear-resistant castable material II 13 and the bottom edge of the lower port inside the material returning leg circular pipe 9 are integrally connected in an obtuse included angle mode. The spray pipe 8 is designed into a rectangular pipe, so that the returned ash rushed out from the lower end of the round pipe 9 of the return leg can be effectively and uniformly blown out on the basis of saving space.

When the boiler normally operates, 10 wind pressures of a hot air duct are greater than the dense phase region pressure of furnace, this application is through connecting pipe 1, female pipe 2, the intercommunication of 10 and furnace of a hot air duct of boiler is realized to distributing pipe 5 and spray tube 8, return ash material when getting into return leg pipe 9 inside, return ash material and rely on gravity to roll down and rush out along the surface of high strength wear-resisting castable 7 and high strength wear-resisting castable two 13, hot-blast in 10 of a hot air duct blows to returning ash through 8 blowout of spray tube, make inside the even furnace that falls of returning ash, make furnace temperature even, furnace bottom front and back temperature difference has been reduced, make the fluidization effect better. Meanwhile, the probability of ash blockage at the lower end of the material returning leg round tube 9 is reduced. In addition, the hand wheel valve 4 can adjust the speed of the hot air. The expansion joint 3 can absorb the relative displacement between the primary hot air duct 10 generated by the sinking of the hearth.

The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made within the scope of the invention.

Claims

1. The utility model provides a returning charge device, includes sealed housing (6) and returning charge leg pipe (9), its characterized in that: comprises a connecting pipe (1), a main pipe (2), a hand wheel valve (4), a distributing pipe (5) and a spraying pipe (8), wherein the return leg circular pipe (9) is inclined and arranged downwards, the lower end of the return leg circular pipe (9) is communicated with the inside of a hearth, the lower end of the return leg circular pipe (9) is communicated with the wall (11) of the hearth through a sealing cover shell (6) to realize sealing connection, one end of the connecting pipe (1) is communicated with a primary hot air duct (10) of a boiler, the other end of the connecting pipe (1) is communicated with the main pipe (2), one end of the spraying pipe (8) is communicated with the main pipe (2) through the distributing pipe (5), the other end of the spraying pipe (8) is communicated with the inside of the hearth after passing through the wall of the lower end of the return leg circular pipe (9), the hand wheel valve (4) is arranged on the distributing pipe (5), the inner wall of the return leg circular pipe (9) and the inner wall of the sealing cover shell (6) are respectively paved with a high-strength wear-resistant castable (7), an inner cavity of the high-strength wear-resistant castable I (7) forms an ash return channel (12), and a high-strength wear-resistant castable II (13) is laid on the upper surface of a spray pipe (8) positioned in the ash return channel (12).

2. The return material device according to claim 1, characterized in that: spray tube (8) are from the outside slope of furnace to furnace inside and distribute down, and distributing pipe (5) are including the upper end of vertical pipeline and vertical pipeline to the one end intercommunication of lateral buckling back and spray tube (8), and the middle section concatenation of the vertical pipeline of distributing pipe (5) has expansion joint (3), and female pipe (2) level is arranged, and the lower extreme of vertical pipeline and the lateral wall of female pipe (2) communicate perpendicularly.

3. The return material device according to claim 2, wherein: the cross section of the spray pipe (8) is rectangular, the plane of one long edge of the rectangular cross section is the upper surface of the spray pipe (8), the gradient of the upper surface of the high-strength wear-resistant castable (13) is consistent with that of the spray pipe (8), and the upper end edge of the high-strength wear-resistant castable (13) and the bottom edge of the lower port inside the material return leg round pipe (9) are integrally connected in an obtuse included angle mode.