CN214554368U - Annular cold and hot primary air mixing device at inlet of coal mill - Google Patents
Annular cold and hot primary air mixing device at inlet of coal mill Download PDFInfo
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- CN214554368U CN214554368U CN202022794434.7U CN202022794434U CN214554368U CN 214554368 U CN214554368 U CN 214554368U CN 202022794434 U CN202022794434 U CN 202022794434U CN 214554368 U CN214554368 U CN 214554368U
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Abstract
The utility model discloses a coal pulverizer entry annular cold and hot primary air mixing arrangement. The utility model comprises a hot primary air pipeline, a cold primary air interface expanding pipe, a cold primary air annular air channel and a cold primary air uniform distribution grid; the cold primary air sequentially passes through the cold primary air pipeline, the cold primary air interface expanding pipe, the cold primary air annular air channel and the cold primary air uniformly-distributed grille to enter the hot primary air pipeline, and the cold primary air and the hot primary air are mixed and then enter the coal mill. The utility model discloses a design cold wind interface expander, cold wind annular wind channel and cold wind equipartition grid once, adopt the equidistance to wait wide or the scheme of gradually expanding arrangement grid hole. The distributed uniform air inlet is realized, the cold and hot primary air can be rapidly and uniformly mixed in a limited distance, the uniformity of a speed field and a temperature field of the mixed air is improved, the inlet air quantity and the accuracy and the stability of temperature measurement of the coal mill are improved, and the more accurate and stable control of the coal mill is realized.
Description
Technical Field
The utility model relates to a coal fired power plant coal pulverizer technical field, especially a coal pulverizer entry annular cold and hot primary air mixing arrangement.
Background
The mixing mode of cold primary air and hot primary air at the inlet of a coal mill of a large coal-fired power plant is generally adopted by adopting direct-flushing entering, so that the cold primary air is difficult to penetrate through a hot primary air flow field in a vertical direction, the mixing distance of the cold primary air and the hot primary air in a subsequent mixing pipe section is short, the cold primary air and the hot primary air cannot be effectively mixed, the flow field of the mixed air before entering the coal mill is seriously uneven in speed and temperature distribution, the inlet air quantity of the coal mill in the actual operation of the power plant is caused to have large deviation and fluctuation with actual measured data of the air temperature, the problems of poor air quantity control accuracy and stability, frequent air door action and the like are further caused, adverse effects are generated on the air quantity control of the coal mill, the automatic adjustment of the coal mill and the stable operation of the coal mill, and the phenomenon is more common under the condition that the primary air pipeline arrangement of a coal-fired power plant system is increasingly compact. Therefore, it is necessary to improve the structure of the mixing position of the cold and hot primary air at the inlet of the coal mill, so that the cold and hot primary air can be quickly and uniformly mixed in a limited distance, the flow field of the mixed air entering the mill is improved, the accuracy and the stability of the air quantity and the air temperature measuring device at the inlet of the coal mill are improved, and the accurate control of the ventilation quantity of the coal mill and the front and rear temperatures of the coal mill is realized.
Disclosure of Invention
In order to solve the problem that cold and hot primary air can not in time effectively mix before coal fired power plant's coal pulverizer entry, the utility model provides a coal pulverizer entry annular cold and hot primary air mixing arrangement.
The utility model provides a technical scheme that its technical problem adopted is:
take the rectangle or square wind pipeline that common length-width ratio is little as the example, the utility model discloses a wind pipeline, cold wind interface expand pipe, cold wind annular wind channel, cold wind equipartition grid, water conservancy diversion baffle are once wind once to hot.
The cold primary air enters the hot primary air pipeline through the cold primary air pipeline, the cold primary air interface expanding pipe, the cold primary air annular air channel and the cold primary air uniformly distributed grids, and the cold primary air and the hot primary air are mixed and then enter the coal mill.
The hot primary air pipeline and the cold primary air pipeline are conventionally designed for a coal mill of a power plant.
The cold primary air interface expanding pipe comprises two diversion baffles, divides cold primary air into three paths, and respectively enters the cold primary air annular air channels on the front side and the two sides of the hot primary air pipeline to realize annular peripheral air inlet. The flow area of the three-channel opening formed by the flow guide baffle is consistent with the distribution proportion of three-channel air volume, the proportion of the flow area of the middle opening inlet to the total flow area is generally less than or equal to the proportion of the front side air intake to the total air volume, so that uniform air volume distribution is realized, and the flow resistance in the pipeline is effectively reduced.
And the cold primary air flows in the cold primary air annular air channel and enters the cold primary air uniformly-distributed grids on the peripheral pipe wall of the hot primary air pipeline. The flow area of the two sides of the annular air duct of the cold primary air is generally not smaller than the area of the inlets of the two sides of the expanding pipe of the cold primary air interface.
The cold primary air uniformly distributed grids are arranged on four sides of the wall surface of the hot primary air pipeline, a plurality of grid holes are arranged along the flowing direction of the cold primary air, the cold primary air uniformly enters the hot primary air pipeline through the grid holes, and the cold primary air and the hot primary air are uniformly mixed in an all-round mode. The flow area and the number of the grid holes are required to ensure the uniformity of air flow distribution, two or more than two equal-division grid holes are arranged on each surface of the primary hot air pipeline according to the actual pipeline size, and the grid holes on two opposite surfaces are generally arranged in a hedging mode. The total flow area of all grid holes of the cold primary air uniform distribution grid is generally not less than the flow area of the cold primary air pipeline, so that the local resistance loss is reduced.
The peripheral annular air inlet device can still be selected for the rectangular hot primary air pipeline with large length and width and short side air inlet. Preferably, the air inlet mode of two sides can be simplified, the two flow guide baffles in the cold primary air interface expansion pipe divide cold primary air into two paths, and the cold primary air uniformly distributed grids are arranged on the long edge of the hot primary air pipeline, so that air inlet of two sides is realized, and the requirement of uniformly mixing cold primary air and hot primary air can be basically met.
Aiming at the circular hot primary air pipeline, the annular cold-hot primary air mixing device can be designed. The cold primary air is uniformly distributed on the periphery of the hot primary air pipeline, so that the peripheral air inlet is realized.
The utility model discloses beneficial effect as follows:
the utility model discloses the cold and hot primary air mixing arrangement of coal pulverizer entry annular that hot primary air pipeline to all kinds of shapes provided adopts impartial area annular air inlet mode, can realize the distributing type air inlet for cold and hot air current can be at shorter distance, mix in faster time evenly, can effectively promote the distribution uniformity in temperature field, the speed field of the interior and coal pulverizer entrance primary air of pipeline basically. If the change of the on-way flow and the resistance in the annular air duct of the cold primary air is considered to cause that the air quantity entering each grid hole on the way is not uniform enough, the arrangement scheme that the area of the grid holes is gradually expanded along the flow direction can be further preferably adopted to ensure that the air quantity entering each grid hole is equal.
The utility model discloses an air interface expander, the annular wind channel of wind once of cold and the wind equipartition grid of cold of design to adopt the equidistance to wait wide or the scheme of gradually expanding arrangement grid hole, designed suitable preferred structure to wind channel of square, rectangle, circular three kinds. The distributed uniform air inlet is realized, the cold and hot primary air can be rapidly and uniformly mixed in a limited distance, the uniformity of a speed field and a temperature field of the mixed air is improved, the inlet air quantity and the accuracy and the stability of temperature measurement of the coal mill are improved, and the more accurate and stable control of the coal mill is realized.
Drawings
Fig. 1 is the utility model is suitable for a coal pulverizer entry annular cold and hot primary air mixing arrangement overall structure sketch map of rectangle or square pipeline that length-width ratio is little, the grid hole adoption of cold primary air equipartition grid waits flow area to arrange.
Fig. 2 is the utility model is a coal pulverizer entry annular cold and hot primary air mixing arrangement overall structure sketch map of the great rectangle pipeline of length-width ratio, the grid hole of cold primary air equipartition grid adopts equal flow area to arrange.
Fig. 3 is the utility model is suitable for a coal pulverizer entry annular cold and hot primary air mixing arrangement overall structure sketch map of circular pipeline, cold primary air equipartition grid adopt equal flow area to arrange.
Fig. 4 is the overall structure schematic diagram of the annular cold and hot primary air mixing device at the coal mill inlet suitable for gradually expanding the arrangement grid holes, wherein the area of the grid holes of the cold primary air uniform distribution grid gradually expands along the flow direction.
In the figure: 1. a hot primary air duct; 2. a cold primary air duct; 3. expanding a pipe through a cold primary air interface; 4. a cold primary air annular air duct; 5. uniformly distributing cold primary air on the grids; 6. a diversion baffle plate.
Detailed Description
The following describes the practice of the present invention in detail with reference to the accompanying drawings.
Example 1:
referring to fig. 1, fig. 1 is a schematic diagram of the whole structure of the annular cold and hot primary air mixing device at the inlet of the coal pulverizer suitable for the rectangular or square pipeline with the length-width ratio smaller than the specified ratio of the present invention, which includes a hot primary air pipeline 1, a cold primary air pipeline 2, a cold primary air interface expanding pipe 3, a cold primary air annular air duct 4, a cold primary air uniform distribution grid 5, and a flow guide baffle 6.
The cold primary air sequentially passes through the cold primary air pipeline 2, the cold primary air interface expanding pipe 3, the cold primary air annular air duct 4 and the cold primary air uniform distribution grid 5 to enter the hot primary air pipeline 1, and the cold primary air and the hot primary air are mixed and then enter the coal mill.
The cold primary air interface expanding pipe 3 comprises two diversion baffles 6, divides cold primary air into three paths, and respectively enters the cold primary air annular air channels 4 on the front side and the left side and the right side of the hot primary air pipeline 1 to realize annular peripheral air inlet. The size of the flow area of the three-channel opening formed by the flow guide baffle 6 is consistent with the distribution proportion of three-channel air volume, and the proportion of the flow area of the middle opening entering the front side of the primary hot air pipeline 1 to the total flow area is less than or equal to the proportion of the front side air intake to the total air volume, so that uniform air volume distribution is realized, and the flow resistance in the pipeline is effectively reduced.
And the cold primary air flows into the cold primary air uniformly-distributed grids 5 on the peripheral pipe wall of the hot primary air pipeline 1 in the cold primary air annular air channel 4. The flow area of the two sides of the cold primary air annular air duct 4 is not less than the area of the inlets of the two sides of the cold primary air interface expanding pipe 3.
The cold primary air uniformly distributed grids 5 are arranged on the peripheral pipe wall of the hot primary air pipeline 1, a plurality of grid holes are arranged along the flowing direction of the cold primary air, the cold primary air uniformly enters the hot primary air pipeline 1 through the grid holes, and the cold primary air and the hot primary air are uniformly mixed in an all-round mode. The flow area and the number of the grid holes are required to ensure the uniformity of air flow distribution, two or more equal-division grid holes are arranged on each surface of the primary hot air pipeline 1 according to the actual pipeline size, and the grid holes arranged on the corresponding surface are arranged in a hedging mode. The total flow area of all the grid holes of the cold primary air uniform distribution grid 5 is larger than or equal to the flow area of the cold primary air pipeline 2, so that the local resistance loss is reduced.
Example 2:
the above-mentioned peripheral annular air intake device can still be selected for the rectangular hot primary air duct 1 with the length-width ratio larger than the specified ratio and with the short side for air intake. Preferably, as shown in fig. 2, the air inlet mode can be simplified into a two-side air inlet mode, the two flow guide baffles 6 in the cold primary air interface expansion pipe 3 divide cold primary air into two paths, and the cold primary air uniformly-distributed grids 5 are arranged on the long edge of the hot primary air pipeline 1, so that air inlet of the long edges of the two sides is realized, and the requirement of uniform mixing of the cold primary air and the hot primary air can be basically met.
Example 3:
aiming at the circular hot primary air pipeline 1, a circular cold-hot primary air mixing device can be designed. As shown in fig. 3, cold primary air is uniformly distributed on the circumference of the hot primary air pipeline 1 to form grids 5, so that circumferential air inlet is realized.
As above, the utility model discloses the cold and hot primary air mixing arrangement of coal pulverizer entry annular that hot primary air pipeline 1 to all kinds of shapes provided adopts impartial area annular air inlet mode, can realize the distributing type air inlet for cold and hot air current can be in shorter distance, faster time the interior mixing even, can effectively promote the distribution uniformity in temperature field, the speed field of the interior and coal pulverizer entrance primary air of pipeline basically. If the variation of the on-way flow and the resistance in the primary air annular air duct 4 is considered to cause that the air quantity entering each grid hole on the way is not uniform enough, a preferable arrangement scheme that the areas of the grid holes are gradually expanded along the flow direction can be further adopted to ensure that the air quantity entering each grid hole is equal, as shown in fig. 4.
The utility model provides a coal pulverizer entry annular cold and hot primary air mixing arrangement on the basis of the original cold and hot primary air hybrid piping of coal fired power plant's coal pulverizer entry, through the cold primary air interface expander of design, cold primary air annular wind channel and cold primary air equipartition grid, realize the even air inlet of distributing type, make cold and hot air current can be at shorter distance, mix evenly in the faster time, can improve the homogeneity in mixed wind speed field, the temperature field, thereby improve the accuracy of primary air amount of wind and temperature measurement, with the running state of accurate regulation and control coal pulverizer and powder process system. To the newly designed unit, also can adopt the utility model discloses the device.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (10)
1. Coal pulverizer entry annular cold and hot primary air mixing arrangement, its characterized in that includes hot primary air pipeline, cold primary air interface expander pipe, cold primary air annular wind channel, cold primary air equipartition grid, wherein: the cold primary air sequentially passes through the cold primary air pipeline, the cold primary air interface expanding pipe, the cold primary air annular air channel and the cold primary air uniformly-distributed grille to enter the hot primary air pipeline, and the cold primary air and the hot primary air are mixed and then enter the coal mill.
2. The coal pulverizer inlet annular cold and hot primary air mixing device of claim 1, further comprising two diversion baffles that divide the cold primary air into three paths: one path enters the front side of the hot primary air pipeline, and the other two paths respectively enter the cold primary air annular air channels on the left side, the right side and the rear side, so that annular air inlet around is realized.
3. The coal mill inlet annular cold and hot primary air mixing device of claim 2, wherein the flow area of the three-channel opening formed by the flow guide baffle is consistent with the distribution proportion of three-channel air volume, and the proportion of the flow area of the middle opening entering the front side of the hot primary air pipeline to the total flow area is less than or equal to the proportion of the front side intake air volume to the total air volume, so as to realize uniform air volume distribution.
4. The coal mill inlet annular cold and hot primary air mixing device as claimed in claim 3, wherein the cold primary air flows in the cold primary air annular air duct into cold primary air uniform distribution grids on the peripheral tube walls of the hot primary air pipeline; the flow area of the two sides of the primary cold air annular air duct is larger than or equal to the area of inlets at the two sides of the primary cold air interface expanding pipe.
5. The coal mill inlet annular cold-hot primary air mixing device as claimed in claim 4, wherein the cold primary air uniform distribution grating is arranged on the wall surface around the hot primary air pipeline, and a plurality of grating holes with the same size are uniformly arranged; the cold primary air uniformly enters the hot primary air pipe through the grid holes, and uniform mixing is realized in all directions.
6. The annular cold and hot primary air mixing device at the inlet of the coal mill as claimed in claim 1, wherein the cold primary air is divided into two paths by two flow guide baffles, and a cold primary air uniform distribution grid is arranged on the surface of the long side of the hot primary air pipeline to realize air inlet of the long sides at two sides.
7. The coal mill inlet annular cold and hot primary air mixing device of claim 1, wherein the primary air duct is circumferentially provided with uniformly distributed cold primary air grilles to achieve circumferential air intake.
8. The annular cold and hot primary air mixing device at the inlet of the coal mill as claimed in claim 4, 5, 6 or 7, wherein the hot primary air pipeline is provided with surfaces with uniformly distributed cold primary air grids, each surface is provided with two or more grid holes, and the grid holes of two opposite surfaces are arranged in an opposite-impact manner; and the total flow area of all the grid holes is larger than or equal to the flow area of the cold primary air pipeline.
9. The coal pulverizer inlet annular cold and hot primary air mixing device of claim 8, wherein the cold primary air is uniformly distributed with grids having equal area of grid holes.
10. The coal pulverizer inlet annular cold and hot primary air mixing device of claim 8, wherein the cold primary air is uniformly distributed with grids, and the area of the grid holes is optimally designed to be gradually enlarged along the flow direction of the cold primary air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022794434.7U CN214554368U (en) | 2020-11-27 | 2020-11-27 | Annular cold and hot primary air mixing device at inlet of coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022794434.7U CN214554368U (en) | 2020-11-27 | 2020-11-27 | Annular cold and hot primary air mixing device at inlet of coal mill |
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| Publication Number | Publication Date |
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| CN214554368U true CN214554368U (en) | 2021-11-02 |
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| CN202022794434.7U Active CN214554368U (en) | 2020-11-27 | 2020-11-27 | Annular cold and hot primary air mixing device at inlet of coal mill |
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| CN (1) | CN214554368U (en) |
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