Mixing device for boiler ash recycling system of circulating fluidized bed boiler
By designing a mixing device with a mixing chamber and multi-stage deceleration collision components, the problem of uneven mixing of furnace ash and stone powder in circulating fluidized bed boilers was solved, achieving uniform mixing of powder materials and improving boiler combustion efficiency.
Patent Information
- Application Number
- CN202520313623.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-02-25
AI Technical Summary
The uneven mixing of residual ash and stone powder after combustion in a circulating fluidized bed boiler leads to poor boiler combustion performance.
Design a mixing device including a mixing chamber, multi-stage deceleration collision components, and a spiral pipe. The ash and stone powder are mixed by collision in the mixing chamber through pneumatic conveying, and the powder is slowly dropped by the multi-stage deceleration collision components and the spiral pipe to ensure uniform mixing.
It effectively solved the problem of uneven mixing of furnace ash and stone powder, and improved the boiler combustion efficiency and powder utilization rate.
Smart Images
Figure CN223945558U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of mixing devices, more specifically, especially a kind of mixing device for circulating fluidized bed boiler furnace ash recycling system. BACKGROUND
[0002] Incomplete fuel carbon, not completely utilized lime powder are remained in furnace ash after combustion of circulating fluidized bed boiler, in order to save cost, improve utilization, usually the furnace ash recycling is recycled, and the furnace ash after recycling is mixed with lime powder and stored in storage bin to wait for input into boiler again for combustion. In the existing powder storage bin, the furnace ash and stone powder are respectively conveyed by pipeline gas force arranged at the top of bin body, and due to the different quality of furnace ash and stone powder, the speed difference of the two in falling process causes stratification, so that the two are not mixed evenly, affecting the combustion effect of subsequent boiler. SUMMARY
[0003] The utility model aims at the deficiency of prior art, and provides a kind of circulating fluidized bed boiler furnace ash recycling system mixing device with simple structure and uniform powder mixing.
[0004] The technical scheme of the utility model is realized as follows: a kind of circulating fluidized bed boiler furnace ash recycling system mixing device, including storage bin, the storage bin upper portion is equipped with mixing bin, two symmetrical supply pipes are connected on the upper end of mixing bin, and the outlet ends of the two supply pipes are oppositely arranged;Mixing feed pipe is arranged in the lower end of mixing bin and leads to the storage bin, and a plurality of multistage speed reduction collision parts are arranged in the storage bin.
[0005] In the above-mentioned circulating fluidized bed boiler furnace ash recycling system mixing device, the multistage speed reduction collision part includes a mounting bracket arranged in the storage bin, and a stand is detachably arranged on the mounting bracket;A plurality of tapered blocks gradually increasing from top to bottom are uniformly distributed on the stand.
[0006] In the above-mentioned circulating fluidized bed boiler furnace ash recycling system mixing device, a plurality of speed reduction protrusions are distributed on the surface of the tapered block.
[0007] In the above-mentioned circulating fluidized bed boiler furnace ash recycling system mixing device, the speed reduction protrusion is V-shaped and the top end faces the top end of the tapered block.
[0008] In the above-mentioned circulating fluidized bed boiler furnace ash recycling system mixing device, the mixing bin includes a bracket arranged on the upper end of the storage bin, a spherical bin body is arranged on the bracket, and the two supply pipes are symmetrically arranged on the upper end of the spherical bin body, and the included angle α between the supply pipe and the horizontal plane is 20-45.
[0009] The mixing feeding pipe comprises a spiral pipe arranged at the bottom of the mixing bin, and a vertical pipe connected to the inside of the storage bin at the bottom of the spiral pipe, wherein the ascending angle of the spiral pipe is 10-20°.
[0010] After the above structure is adopted, the furnace ash and the stone powder are mixed by pneumatic conveying into the mixing bin, and then fall into the storage bin after collision and mixing, the speed of the powder falling is slowed down by the collision of the multi-stage speed reduction collision piece, and the stratification caused by the different acceleration of the two kinds of powder due to the different mass is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS
[0011] The utility model will be further explained in detail in combination with the embodiments in the drawings, but does not constitute any limitation to the utility model.
[0012] Fig. 1 It is the structure schematic diagram of the utility model;
[0013] Fig. 2 It is the structure schematic diagram of the multi-stage speed reduction collision piece of the utility model.
[0014] In the drawing: 1, storage bin;2, mixing bin;2a, support;2b, spherical bin body;3, feeding pipe;4, mixing feeding pipe;4a, spiral pipe;4b, vertical pipe;5, multi-stage speed reduction collision piece;5a, mounting support;5b, stand;5c, conical stopper;5d, speed reduction protruding block. DETAILED DESCRIPTION
[0015] Referring to Figs. 1-2 The utility model discloses a kind of mixing devices for circulating fluidized bed boiler furnace ash recycling system, including storage bin 1, the storage bin 1 top is equipped with mixing bin 2, is connected with two symmetrical feeding pipes 3 of setting in mixing bin 2 upper end, the outlet end of two feeding pipes 3 is oppositely arranged;Mixing feeding pipe 4 is provided in the mixing bin 2 lower end and is led to the inside of storage bin 1, and multi-stage speed reduction collision piece 5 is provided in storage bin 1.In the bottom of storage bin, discharge valve and the components such as screw conveyor for feeding are equipped.
[0016] The furnace ash and the stone powder are mixed by pneumatic conveying into the mixing bin, and then fall into the storage bin after collision and mixing, the speed of the powder falling is slowed down by the collision of the multi-stage speed reduction collision piece, and the stratification caused by the different acceleration of the two kinds of powder due to the different mass is effectively reduced.
[0017] In the embodiment, the multi-stage speed reduction collision piece 5 includes mounting support 5a arranged in the storage bin 1, and stand 5b is detachably arranged on the mounting support 5a;A plurality of conical stoppers 5c that are gradually increased are uniformly distributed on the stand 5b from top to bottom.
[0018] In the embodiment, preferably, the conical block 5c is provided with a plurality of speed reduction protrusions 5d distributed on the surface of the conical block 5c. The speed reduction protrusions can be distributed in a staggered manner on the surface of the conical block, or can be linearly distributed and gradually increased in size along the direction from the top of the conical block to the bottom.
[0019] Further preferably, the speed reduction protrusions 5d are V-shaped and the top end of each speed reduction protrusion 5d is directed towards the top end of the conical block 5c. With this structure, the speed reduction protrusions 5d can be prevented from being filled with materials.
[0020] In the embodiment, preferably, the mixing bin 2 comprises a support 2a arranged at the upper end of the storage bin 1, a spherical bin body 2b is arranged on the support 2a, and two feeding pipes 3 are symmetrically arranged at the upper end of the spherical bin body 2b and the included angle a between the feeding pipes 3 and the horizontal plane is 20-45°. When the furnace ash and the stone powder are transported into the spherical bin body by the air flow, the furnace ash and the stone powder collide and mix, and the powder in the spherical bin body rolls under the impact of the air flow, so that the powder is mixed more uniformly.
[0021] In the embodiment, the mixing feeding pipe 4 comprises a spiral pipe 4a arranged at the bottom of the mixing bin 2, and a vertical pipe 4b connected to the storage bin 1 is arranged at the bottom of the spiral pipe 4a, and the rise angle of the spiral pipe 4a is 10-20°. The mixed powder is discharged through the spiral pipe with a gentle slope, so that the distance of the free fall of the mixed powder between the mixing bin and the multi-stage speed reduction collision piece is reduced, and the falling speed of the mixed powder is prevented from being too fast.
[0022] In operation, the furnace ash and the stone powder recovered from the boiler are transported into the mixing bin through the corresponding feeding pipes for mixing, and then the mixed powder is transported into the storage bin through the spiral pipe, and the mixed powder continuously collides with the conical block and the speed reduction protrusions arranged on the surface of the conical block, and then falls slowly into the bottom of the storage bin for storage.
[0023] The above embodiments are preferred embodiments of the present application, which are only used to facilitate the description of the present application and do not limit the present application in any form. Any person skilled in the art can make partial changes or modifications to the equivalent embodiments within the scope of the technical features of the present application without departing from the technical features of the present application, and the equivalent embodiments still belong to the scope of the technical features of the present application.
Claims
1. A mixing device for a circulating fluidized bed boiler ash recycling system, comprising a storage bin (1), characterized in that, The mixing bin (2) is arranged above the storage bin (1), two symmetrical feeding pipes (3) are connected to the upper end of the mixing bin (2), and the outlet ends of the two feeding pipes (3) are oppositely arranged; a mixing feeding pipe (4) is arranged at the lower end of the mixing bin (2) and extends into the storage bin (1); and a multistage speed reduction collision piece (5) is arranged in the storage bin (1). The multistage speed reduction collision piece (5) comprises a mounting bracket (5a) arranged in the storage bin (1), and a stand (5b) is detachably arranged on the mounting bracket (5a); a plurality of tapered blocking pieces (5c) gradually increasing in size are uniformly arranged on the stand (5b) from top to bottom.
2. A mixing device for a circulating fluidized bed boiler ash recycling system according to claim 1, characterized in that, The tapered blocking pieces (5c) are distributed with a plurality of speed reduction convex blocks (5d) on the surfaces thereof.
3. A mixing device for a circulating fluidized bed boiler ash recycling system according to claim 2, characterized in that The speed reduction convex blocks (5d) are V-shaped and the top ends thereof are directed to the top end of the tapered blocking piece (5c).
4. The mixing device for a circulating fluidized bed boiler ash recycling system according to claim 1, characterized in that, The mixing bin (2) comprises a bracket (2a) arranged at the upper end of the storage bin (1), a spherical bin body (2b) is arranged on the bracket (2a), and the two feeding pipes (3) are symmetrically arranged at the upper end of the spherical bin body (2b) and the included angle (α) between the feeding pipe (3) and the horizontal plane is 20-45°.
5. A mixing device for a circulating fluidized bed boiler ash recycling system according to claim 1, characterized in that, The mixing feeding pipe (4) comprises a spiral pipeline (4a) arranged at the bottom of the mixing bin (2), and a vertical pipeline (4b) extending into the storage bin (1) is connected to the bottom of the spiral pipeline (4a); and the ascending angle of the spiral pipeline (4a) is 10-20°.