CN-121972261-A - Biomass turning device and method for medium-speed coal mill

CN121972261ACN 121972261 ACN121972261 ACN 121972261ACN-121972261-A

Abstract

The invention discloses a biomass turning device and method for a medium-speed coal mill, comprising a turning mechanism arranged above a millstone in a coal mill shell, wherein the turning mechanism comprises a driving assembly, a transmission assembly and turning assemblies, the transmission assembly comprises a hollow annular connecting piece arranged in the center of the top of the millstone, a driven shaft fixedly connected with the top of the hollow annular connecting piece, and a driving shaft penetrating the inside of the driven shaft and extending downwards into the hollow annular connecting piece and rotationally connected with the driven shaft, the driving assembly comprises a planetary gear set and an explosion-proof motor for driving the planetary gear set, and the turning assemblies comprise a plurality of trapezoid turning seats which are arranged at equal intervals along the circumferential direction of the hollow annular connecting piece, and screw conveying shafts which are rotationally arranged in the trapezoid turning seats. According to the invention, through the composite motion mechanism and the gradually-expanding discharging structure, the uniform distribution and the efficient conveying of biomass on the millstone are realized, and the milling efficiency and the equipment stability are obviously improved.

Inventors

ZHANG CUIHUA
LIAO WEIHUI
TU BO
YE HUAFENG
XIA XIAOLIN
RUAN ZHILONG
Ni Shengyue
FENG BIN
XU YUANGANG

Assignees

广东红海湾发电有限公司
广东电力发展股份有限公司
西安热工研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260323

Claims (10)

1. The biomass turning device of the medium speed coal mill is characterized by comprising a turning mechanism (200) arranged above a millstone (101) in a coal mill shell (100), wherein the turning mechanism (200) comprises a driving assembly, a transmission assembly and a turning assembly; The driving assembly is used for providing power for the material turning assembly through the transmission assembly; The material turning assembly comprises a plurality of trapezoid material turning seats (211) which are arranged at equal intervals along the circumferential direction of the transmission assembly, and a spiral conveying shaft (209) which is arranged inside each trapezoid material turning seat (211) in a rotating mode, wherein one end of the spiral conveying shaft (209) extends to the inside of the transmission assembly and is fixedly connected with the transmission assembly.
2. The biomass stirring device of the medium speed coal mill according to claim 1, wherein the transmission assembly comprises a hollow annular connecting piece (206) arranged at the center of the top of the grinding disc (101), a driven shaft (202) fixedly connected with the top of the hollow annular connecting piece (206), and a driving shaft (205) penetrating through the driven shaft (202) and extending downwards into the hollow annular connecting piece (206) and rotationally connected with the driven shaft (202), wherein a bevel gear I (207) is fixedly connected to the end part of the driving shaft (205) positioned in the hollow annular connecting piece (206), and a bevel gear II (208) meshed with the bevel gear I (207) is arranged in the hollow annular connecting piece (206); a plurality of trapezoid turning seats (211) are arranged at equal intervals along the circumferential direction of the hollow annular connecting piece (206), and one end of a spiral conveying shaft (209) extends into the hollow annular connecting piece (206) and is fixedly connected with a corresponding bevel gear II (208).
3. The biomass turning-up device of the medium speed coal mill according to claim 2, wherein the driving assembly comprises a planetary gear set and an explosion-proof motor (204) for driving the planetary gear set, and the planetary gear set is respectively connected with the top end of the driving shaft (205) and the top end of the driven shaft (202).
4. A medium speed coal mill biomass turning device according to claim 3, characterized in that the trapezoid turning seat (211) is internally provided with a conveying cavity (210) for accommodating a screw conveying shaft (209).
5. The biomass turning device of the medium speed coal mill according to claim 4, wherein a feeding hole (217) is formed in a slope surface of the trapezoid turning seat (211), and a plurality of discharging holes (216) communicated with the conveying cavity (210) are formed in a vertical surface of the trapezoid turning seat (211).
6. The biomass turnover device of a medium speed coal mill according to claim 5, characterized in that the feeding port (217) is in an arc-shaped opening structure from one end far from the hollow annular connecting piece (206) to one end close to the hollow annular connecting piece (206), and one end close to the hollow annular connecting piece (206) is communicated with the conveying cavity (210).
7. The biomass turning device of the medium speed coal mill according to claim 5, wherein the discharge ports (216) are arranged at equal intervals along the length direction of the trapezoid turning seat (211), and the caliber of the discharge ports gradually increases from the inner end to the outer end of the trapezoid turning seat (211).
8. A medium speed coal mill biomass turning device according to claim 3, characterized in that the planetary gear set comprises a driving gear (213) fixedly connected with the top end of the driving shaft (205), an inner gear ring (212) fixedly connected with the top end of the driven shaft (202), and a driven gear (214) meshed between the driving gear (213) and the inner gear ring (212), and the output end of the explosion-proof motor (204) is connected with the driving gear (213).
9. A medium speed coal mill biomass turning-up device according to claim 3, characterized in that the driving assembly further comprises a supporting plate (203) and connecting rods (201), the planetary gear set is connected with the supporting plate (203) through bearings (215), the plurality of connecting rods (201) are fixed at equal intervals along the circumferential direction of the outer side of the supporting plate (203) and are fixed with the inner wall of the coal mill housing (100), and the explosion-proof motor (204) is mounted at the top of the supporting plate (203).
10. A medium speed coal mill biomass turning method, characterized in that the method is based on a medium speed coal mill biomass turning device according to any one of claims 1 to 9, comprising: after the drive assembly starts, the output end of the drive assembly drives the spiral conveying shaft (209) to rotate in the corresponding trapezoid material turning seat (211) through the transmission assembly, when biomass falls into the material turning assembly, the whole material turning assembly is driven by the transmission assembly to move along the circumference, and the biomass is pushed by the spiral conveying shaft (209) to move outwards and is uniformly discharged.

Description

Biomass turning device and method for medium-speed coal mill Technical Field The invention relates to the technical field of coal mills, in particular to a biomass turning device and method for a medium-speed coal mill. Background In biomass energy utilization process, medium speed coal mills are often used for pretreatment and pulverization of biomass fuel. However, biomass raw materials generally have the characteristics of high fiber content, poor fluidity, easy winding and agglomeration and the like. When the traditional coal mill grinds biomass, materials are easy to accumulate in the center area of the grinding disc, and are difficult to automatically and uniformly diffuse to the peripheral grinding area. The uneven distribution can cause low grinding efficiency, the abrasion of the inner ring and the central area of the grinding disc is aggravated, the outer ring area is not fully utilized, and meanwhile, the problems of equipment vibration increase, unstable output and the like can be caused, so that the long-term stable operation and the overall treatment efficiency of the equipment are influenced. In the prior art, although a simple scraping plate or a fixed guide plate is arranged above the grinding disc to improve material distribution, the function of the device is generally limited to radial scraping, the accumulated biomass is difficult to effectively break up, and continuous and controllable conveying from the center to the outer ring cannot be realized. Disclosure of Invention The invention aims to overcome the defects of the prior art, provides a biomass turning device and a biomass turning method of a medium-speed coal mill, according to the invention, through the composite motion mechanism and the gradually-expanding discharging structure, the uniform distribution and the efficient conveying of biomass on the millstone are realized, and the milling efficiency and the equipment stability are obviously improved. In order to achieve the above purpose, the present invention adopts the following technical scheme: the biomass turning device of the medium-speed coal mill comprises a turning mechanism which is arranged above an inner millstone of a coal mill shell, wherein the turning mechanism comprises a driving assembly, a transmission assembly and a turning assembly; The driving assembly is used for providing power for the material turning assembly through the transmission assembly; The material turning assembly comprises a plurality of trapezoid material turning seats which are arranged at equal intervals along the circumferential direction of the transmission assembly, and a spiral conveying shaft which is arranged inside each trapezoid material turning seat in a rotating mode, wherein one end of the spiral conveying shaft extends into the transmission assembly and is fixedly connected with the transmission assembly. The invention is further improved in that the transmission assembly comprises a hollow annular connecting piece arranged at the center of the top of the grinding disc, a driven shaft fixedly connected with the top of the hollow annular connecting piece, and a driving shaft penetrating the inside of the driven shaft and extending downwards into the hollow annular connecting piece and rotationally connected with the driven shaft, wherein a bevel gear I is fixedly connected with the end part of the driving shaft positioned in the hollow annular connecting piece, and a bevel gear II meshed with the bevel gear I is arranged in the hollow annular connecting piece; The plurality of trapezoid turning seats are arranged at equal intervals along the circumferential direction of the hollow annular connecting piece, and one end of the spiral conveying shaft extends into the hollow annular connecting piece and is fixedly connected with the corresponding bevel gear II. The invention is further improved in that the driving assembly comprises a planetary gear set and an explosion-proof motor for driving the planetary gear set, and the planetary gear set is respectively connected with the top end of the driving shaft and the top end of the driven shaft. The invention is further improved in that the inside of the trapezoid turning seat is provided with a conveying cavity for accommodating the spiral conveying shaft. The invention is further improved in that the inclined surface of the trapezoid turning seat is provided with a feeding hole, and the vertical surface of the trapezoid turning seat is provided with a plurality of discharging holes communicated with the conveying cavity. The invention is further improved in that the feeding hole has an arc-shaped opening structure from one end far from the hollow annular connecting piece to one end close to the hollow annular connecting piece, and one end close to the hollow annular connecting piece is communicated with the conveying cavity. The invention is further improved in that the discharge holes are arranged at equal intervals along the length