CN214390432U - Nozzle structure of spliced medium-speed coal mill - Google Patents
Nozzle structure of spliced medium-speed coal mill Download PDFInfo
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- CN214390432U CN214390432U CN202023183319.2U CN202023183319U CN214390432U CN 214390432 U CN214390432 U CN 214390432U CN 202023183319 U CN202023183319 U CN 202023183319U CN 214390432 U CN214390432 U CN 214390432U
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Abstract
The utility model relates to a concatenation formula medium speed pulverizer nozzle structure, it includes: a nozzle block rotating with the grinding disc; the nozzle block is of a splicing structure and is divided into an upper nozzle block and a lower nozzle block; the upper nozzle block is arranged on the grinding disc; and the upper nozzle block and the lower nozzle block are fixedly connected into a whole. The utility model discloses both can realize the improvement of nozzle wearability, prolong the life-span of nozzle piece, can strengthen the machinability of nozzle piece again, adjust when being convenient for install. After the upper nozzle block and the lower nozzle block are matched, an efficient air passage molded line is formed, primary air powder conveying efficiency can be guaranteed, and therefore operation efficiency of the coal mill is guaranteed.
Description
Technical Field
The utility model relates to the field of machinary, especially indicate a concatenation formula medium speed pulverizer nozzle structure for thermal power factory.
Background
The coal-fired power plant boiler pulverizing system usually adopts a medium-speed coal mill, and the main function of the coal-fired power plant boiler pulverizing system is to grind raw coal into coal powder, send the coal powder out of the coal mill through primary air and send the coal powder to a boiler for combustion. The nozzle of the medium-speed coal mill is an important structure for organizing primary air, and can organize an internal air field of the coal mill to realize the drying and conveying effects of the primary air on pulverized coal, so that the drying and ventilation output of the coal mill is guaranteed to meet the operation requirement.
At present, a medium-speed coal mill in a coal-fired power plant mostly adopts an integral nozzle structure, and a nozzle can be a whole ring or a sectional type. As shown in fig. 1, the nozzle 2 ' is connected with the grinding disc 1 ' and rotates together with the grinding disc 1 '; during operation, primary air enters the cavity of the coal mill through the air passage 3' to form a spirally-rising air field. The main problems with this nozzle design are: the material of the nozzle 2' has poor wear resistance, and can cause primary air speed reduction after being worn, flow field disorder of primary air inside the medium-speed coal mill, low powder feeding efficiency, and finally causes the problems of insufficient output of the coal mill, large pebble coal quantity, high power consumption of the coal mill and a primary fan and the like.
Disclosure of Invention
The utility model aims to overcome the not enough of prior art and the concatenation formula medium speed pulverizer nozzle structure that provides, the wear problem of the medium speed pulverizer nozzle among the prior art can be solved to it, prevents the increase of flow area, and a wind speed reduces to guarantee the powder efficiency that send of wind, stabilize the inside flow field, and can avoid appearing the condition emergence that the coal pulverizer exerted oneself and reduced, the power consumption risees.
The utility model discloses a to be along with the rotatory nozzle structural design of mill for the concatenation formula structure, carry out the components of a whole that can function independently design on the basis of sectional type nozzle, go up the nozzle piece and install on the mill, lower nozzle piece is connected on last nozzle piece, constitutes complete nozzle structure jointly.
The technical scheme of the utility model is that:
the utility model provides a concatenation formula medium speed pulverizer nozzle structure, it includes: a nozzle block rotating with the grinding disc; the nozzle block is of a splicing structure and is divided into an upper nozzle block and a lower nozzle block; the upper nozzle block is arranged on the grinding disc; and the upper nozzle block and the lower nozzle block are fixedly connected into a whole.
Since the wear of the nozzle during operation is mainly concentrated at the level of the outlet 1/3, the height of the upper nozzle block is 1/3 to 1/2 the total nozzle block height. The upper nozzle block is cast by adopting wear-resistant materials, so that the wear resistance of the upper nozzle block is ensured, the service life of the nozzle block is ensured, and the operation requirement is met.
The lower nozzle block is cast by common cast steel, has high material toughness, good processability and good weldability, and is convenient to process and adjust during field installation.
The nozzle block is fastened and connected between the upper nozzle block and the lower nozzle block in each section through bolts, so that the lower nozzle block and the upper nozzle block form a firm whole in operation, and the nozzle structure is guaranteed to be installed firmly and reliably.
The upper nozzle block and the lower nozzle block in the nozzle structure have high-efficiency air passage molded lines at the same time, and after the upper nozzle block and the lower nozzle block are combined, a complete air passage structure is formed, so that the powder feeding efficiency of primary air is ensured, and the operating efficiency of the coal mill is ensured.
The utility model has the advantages that: the utility model discloses both can realize the improvement of nozzle wearability, prolong the life-span of nozzle piece, can strengthen the machinability of nozzle piece again, adjust when being convenient for install. After the upper nozzle block and the lower nozzle block are matched, an efficient air passage molded line is formed, primary air powder conveying efficiency can be guaranteed, and therefore operation efficiency of the coal mill is guaranteed.
Drawings
FIG. 1 is a schematic view of a prior art coal pulverizer nozzle configuration.
Fig. 2 is the utility model discloses concatenation formula medium speed pulverizer nozzle structure schematic diagram.
The reference numbers illustrate:
a grinding disc 1, 1' of the coal mill; the nozzle blocks 2, 2'; an upper nozzle block 21; a lower nozzle block 22;
Detailed Description
The invention is further described with reference to the drawings and examples.
As shown in fig. 2, the utility model discloses concatenation formula medium speed pulverizer nozzle structure, it includes: a nozzle block 2 rotating with the grinding disc 1; the nozzle block 2 is of a splicing structure and is divided into an upper nozzle block 21 and a lower nozzle block 22; the upper nozzle block 21 is arranged on the grinding disc 1; and the upper nozzle block 214 is fixedly connected with the lower nozzle block 22 as a whole.
The upper nozzle block 21 is cast by adopting wear-resistant materials, so that the service life of the nozzle block is ensured, and the operation requirement is met.
The lower nozzle block 22 is cast from common cast steel, has high material toughness, good processability and good weldability, and is convenient to process and adjust during field installation.
The nozzle structure 2 is fastened and connected between the upper nozzle block 21 and the lower nozzle block 22 through the bolts 4, so that the upper nozzle block 21 and the lower nozzle block 22 form a firm whole in operation. Thereby, the nozzle block 2 is ensured to be installed firmly and reliably.
The nozzle block 2, the upper nozzle block 21 and the lower nozzle block 22 have high-efficiency air passage molded lines 3 at the same time, and primary air powder feeding efficiency is guaranteed, so that the running efficiency of the coal mill is guaranteed.
Claims (5)
1. The utility model provides a concatenation formula medium speed pulverizer nozzle structure, it includes: a nozzle block rotating with the grinding disc; the method is characterized in that: the nozzle block is of a splicing structure and is divided into an upper nozzle block and a lower nozzle block; the upper nozzle block is arranged on the grinding disc; and the upper nozzle block and the lower nozzle block are fixedly connected into a whole.
2. The nozzle structure of the spliced medium speed coal mill according to claim 1, wherein: the height of the upper nozzle block accounts for 1/3-1/2 of the height of the whole nozzle block.
3. The nozzle structure of the spliced medium speed coal mill according to claim 1, wherein: the upper nozzle block is cast by adopting wear-resistant materials.
4. The nozzle structure of the spliced medium speed coal mill according to claim 1, wherein: the lower nozzle block is cast by common cast steel.
5. The nozzle structure of the spliced medium speed coal mill according to claim 1, wherein: the upper nozzle block and the lower nozzle block are connected through bolts in a fastening mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023183319.2U CN214390432U (en) | 2020-12-25 | 2020-12-25 | Nozzle structure of spliced medium-speed coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023183319.2U CN214390432U (en) | 2020-12-25 | 2020-12-25 | Nozzle structure of spliced medium-speed coal mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214390432U true CN214390432U (en) | 2021-10-15 |
Family
ID=78041309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023183319.2U Active CN214390432U (en) | 2020-12-25 | 2020-12-25 | Nozzle structure of spliced medium-speed coal mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214390432U (en) |
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2020
- 2020-12-25 CN CN202023183319.2U patent/CN214390432U/en active Active
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