阅读说明：本技术 一种提高风扇磨煤机煤粉分离效率的结构系统 (Structural system for improving pulverized coal separation efficiency of fan coal mill ) 是由 袁德权 王文生 李彦龙 孙伟 张海楠 宋阳 丛锡龙 张睿 于 2020-06-05 设计创作，主要内容包括：本发明涉及一种提高风扇磨煤机煤粉分离效率的结构系统,在外壳体的上部空间的后方位置安装有开度可调节的煤粉细度调节挡板,煤粉分离器位于外壳体的上部空间并且位于煤粉细度调节挡板的后方位置；煤粉细度调节挡板自上而下设置多块,煤粉细度调节挡板与煤粉分离器轴线之间存在夹角,并且该夹角通过转动煤粉细度调节挡板而进行调节；外壳体的下部空间内设置有回粉管道和内部循环管道,内部循环管道与回粉管道连接,内部循环管道位于煤粉分离器和煤粉细度调节挡板的下方,粒度大的煤粉受煤粉细度调节挡板的阻挡作用下落至内部循环管道中,然后经回粉管道回粉后重新进入磨煤机研磨,回粉管道的输出末端设置有回粉孔,回粉孔的直径为800mm。(The invention relates to a structural system for improving the coal powder separation efficiency of a fan coal mill, wherein a coal powder fineness adjusting baffle with adjustable opening degree is arranged at the rear position of the upper space of an outer shell, and a coal powder separator is positioned in the upper space of the outer shell and at the rear position of the coal powder fineness adjusting baffle; the pulverized coal fineness adjusting baffles are arranged in a plurality of blocks from top to bottom, an included angle is formed between each pulverized coal fineness adjusting baffle and the axis of the pulverized coal separator, and the included angle is adjusted by rotating the pulverized coal fineness adjusting baffles; the inner circulation pipeline is connected with the powder return pipeline, the inner circulation pipeline is located below the coal powder separator and the coal powder fineness adjusting baffle, coal powder with large particle size falls into the inner circulation pipeline under the blocking effect of the coal powder fineness adjusting baffle, then enters the coal mill again for grinding after being subjected to powder return through the powder return pipeline, and the output end of the powder return pipeline is provided with a powder return hole with the diameter of 800 mm.)

1. The utility model provides an improve fan coal pulverizer buggy separation efficiency's structural system, includes coal dust separator (3) and shell body (2), its characterized in that: a coal powder fineness adjusting baffle (1) with adjustable opening degree is arranged at the rear position of the upper space of the outer shell (2), and the coal powder separator (3) is positioned in the upper space of the outer shell (2) and at the rear position of the coal powder fineness adjusting baffle (1); the pulverized coal fineness adjusting baffles (1) are arranged in a plurality of blocks from top to bottom, an included angle exists between the pulverized coal fineness adjusting baffles (1) and the axis of the pulverized coal separator (3), and the included angle is adjusted by rotating the pulverized coal fineness adjusting baffles (1); be provided with in the lower part space of shell body (2) and return powder pipeline (4) and internal circulation pipeline (6), internal circulation pipeline (6) are connected with returning powder pipeline (4), and internal circulation pipeline (6) are located the below of buggy separator (3) and buggy fineness adjusting baffle (1), and the big buggy of granularity receives the effect of blockking of buggy fineness adjusting baffle (1) to fall to internal circulation pipeline (6) in, then gets into the coal pulverizer grinding again after returning powder pipeline (4) to go back the powder, the output end of returning powder pipeline (4) is provided with powder hole (5) back, the diameter of returning powder hole (5) is 800 mm.

2. The structural system for improving coal dust separation efficiency of the fan coal mill according to claim 1, is characterized in that: the coal dust separator (3) is connected with a coal inlet pipe (7), and the coal inlet pipe (7) is fixedly connected with the outer shell (2).

3. The structural system for improving coal dust separation efficiency of the fan coal mill according to claim 1, is characterized in that: a powder outlet pipe is arranged in front of the pulverized coal fineness adjusting baffle (1) and used for feeding pulverized coal with qualified fineness into a boiler hearth for combustion.

4. The structural system for improving coal dust separation efficiency of the fan coal mill according to claim 1, is characterized in that: the length of the pulverized coal fineness adjusting baffle (1) is 1410 mm.

5. The structural system for improving coal dust separation efficiency of the fan coal mill according to claim 1, is characterized in that: the structure of the coal powder fineness adjusting baffle (1) is a rectangular folding steel plate with the thickness of 30 mm.

Technical Field

The invention relates to the field of coal pulverizing systems of coal mills, in particular to a structural system for improving the coal dust separation efficiency of a fan coal mill.

Background

The coal-fired power plant has a complex fuel structure and large fluctuation range of coal quality, so that the coal-fired power plant greatly influences the stable and economic operation of a pulverizing system, the coal mill cannot effectively adapt to frequent changes of coal types, and particularly, the problems of large coal powder granularity, poor coal powder uniformity and low separation efficiency of a separator often occur in the actual operation of a fan coal mill for grinding light high-moisture lignite in Mongolian and Yimin areas, so that the coal powder burnout degree is reduced, the boiler economy is reduced, and the unit operation economy is seriously influenced.

Therefore, it is necessary to provide a structural system for improving the coal dust separation efficiency of the fan mill to solve the above problems.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a structural system which has reasonable structural design and can improve the coal dust separation efficiency of a fan coal mill, the structural system optimizes the internal space structural arrangement of the coal mill according to the change condition of coal types, and the change of the coal dust fineness is immediately adjusted by controlling the opening degree of a baffle of an outlet separator of the coal mill, so that the requirements of a boiler on the coal dust fineness and uniformity are met; after the structural system is put into operation, the pulverized coal separation efficiency is improved, and the stable and economic operation of the unit boiler is ensured.

The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides an improve fan coal pulverizer buggy separation efficiency's structural system, includes pulverized coal separator and shell body, its characterized in that: a pulverized coal fineness adjusting baffle with adjustable opening degree is arranged at the rear position of the upper space of the outer shell, and the pulverized coal separator is positioned in the upper space of the outer shell and at the rear position of the pulverized coal fineness adjusting baffle; the pulverized coal fineness adjusting baffles are arranged in a plurality of blocks from top to bottom, an included angle is formed between each pulverized coal fineness adjusting baffle and the axis of the pulverized coal separator, and the included angle is adjusted by rotating each pulverized coal fineness adjusting baffle; the coal pulverizer is characterized in that a powder return pipeline and an internal circulating pipeline are arranged in the lower space of the outer shell, the internal circulating pipeline is connected with the powder return pipeline, the internal circulating pipeline is located below the coal powder separator and the coal powder fineness adjusting baffle, coal powder with large particle size falls to the internal circulating pipeline under the blocking effect of the coal powder fineness adjusting baffle, then enters the coal pulverizer again for grinding after the powder is returned through the powder return pipeline, the powder return hole is formed in the output end of the powder return pipeline, and the diameter of the powder return hole is 800 mm.

Preferably, the coal dust separator is connected with a coal inlet pipe, and the coal inlet pipe is fixedly connected with the outer shell.

Preferably, a powder outlet pipe is arranged in front of the pulverized coal fineness adjusting baffle and used for feeding pulverized coal with qualified fineness into a boiler hearth for combustion.

Preferably, the length of the pulverized coal fineness adjusting baffle is 1410 mm.

Preferably, the structure of the pulverized coal fineness adjusting baffle is a rectangular folded steel plate with the thickness of 30 mm.

Compared with the prior art, the invention has the following advantages and effects:

1. the internal structure space arrangement of the fan coal mill is optimized, and the coal powder separation efficiency of the built-in separator is improved by about 20%;

2. the problem that the coal quality is changed and the coal powder separation efficiency is low is solved, the requirement of boiler combustion on the fineness of the coal powder is ensured, and the boiler combustion efficiency is improved;

3. the application range of the fan coal mill to coal types is expanded, and the general adaptability of the boiler to different coal types is improved.

Drawings

In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive effort.

Fig. 1 is a schematic front sectional structural view of an embodiment of the present invention.

FIG. 2 is a schematic view of the structure of FIG. 1 along the direction B-B.

FIG. 3 is a schematic rear side view of the upper half of the coal pulverizer separator of an embodiment of the present invention.

Fig. 4 is a schematic view of the structure in the direction of a-a in fig. 3.

FIG. 5 is a schematic structural diagram of a main view of a pulverized coal fineness adjusting baffle in the embodiment of the invention.

Description of reference numerals: the pulverized coal fineness adjusting device comprises a pulverized coal fineness adjusting baffle 1, an outer shell 2, a pulverized coal separator 3, a powder return pipeline 4, a powder return hole 5, an internal circulating pipeline 6 and a coal inlet pipe 7.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.