CN112007746A - Square primary air duct flow equalizing device at inlet of coal mill - Google Patents
Square primary air duct flow equalizing device at inlet of coal mill Download PDFInfo
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- CN112007746A CN112007746A CN202010816733.8A CN202010816733A CN112007746A CN 112007746 A CN112007746 A CN 112007746A CN 202010816733 A CN202010816733 A CN 202010816733A CN 112007746 A CN112007746 A CN 112007746A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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Abstract
The invention provides a square primary air duct flow equalizing device at an inlet of a coal mill, which greatly reduces the difficulty of air volume measurement, thereby realizing the accurate measurement and control of online primary air volume on the premise of not replacing the original air volume measuring system and laying a good foundation for the safe, environment-friendly and economic operation of a coal-fired boiler. It includes wind channel, the wind channel of square heat once of square cold, the output in wind channel is provided with the wind channel changeover portion once of the bellied cold of N section for square cold, and N is more than or equal to 2's natural number, every section the terminal intercommunication of output of wind channel changeover portion once of cold has the entry of cold wind case once, all cold wind case horizontal interval arrange in the cross-section width face area of wind channel is once to square heat, cold wind case is located in the region of the air inlet section of wind channel is once to square heat, the orientation of cold wind case wind face is the wind-guiding cambered surface of necking down from bottom to top.
Description
Technical Field
The invention relates to the technical field of multiphase flow numerical simulation calculation, in particular to a square primary air duct flow equalizing device at an inlet of a coal mill.
Background
The primary air at the inlet of the coal mill of the large coal-fired boiler is formed by mixing a hot air and a cold air, wherein the cold and hot primary air pipes at the inlets of the coal mill of the large coal-fired boiler are square air channels, the hot primary air channel is thick and is mainly used for controlling the air quantity, and the cold primary air channel is thin and is mainly used for adjusting the air temperature.
Generally, hot primary air and cold primary air are delivered to the area near the inlet of the coal mill in a main pipe mode, then hot air and cold air branch pipes are respectively led out, and the mixed air enters each coal mill through a mixing air channel. However, the distance from the main pipe to the coal mill inlet is usually less than 10 meters, a cold air door, a hot air door, a mixing air door and a cold air mixing point are arranged between the main pipe and the coal mill inlet, and complicated geometrical structures such as variable cross sections and turning are required.
The mixing point of the cold primary air is usually directly opened on the hot primary air channel, and the cold air is mixed under the action of pressure difference, and a measure of uniform mixing is not taken. Therefore, the temperature at the initial mixing point of the cold and hot primary air is "JingWei clear", and the cold and hot uniformity can be gradually realized only by the disturbance along the flow after the mixing point and the heat and mass transfer process, so that the effect of uniform distribution of the temperature field in a short distance is difficult to realize.
The speed field and the temperature field in the mixed air duct at the inlet of the coal mill are seriously uneven, so that the measurement result of a primary air quantity measurement system arranged in the area is distorted, the primary air-coal ratio is improperly controlled, a series of problems of blockage and jumping of the mill, high combustible content of fly ash, high emission concentration of nitrogen oxides, serious abrasion of a pulverizing system and the like occur, and the safety, economy and environmental protection operation of a coal-fired boiler are seriously influenced.
In engineering practice, many users continuously search various novel primary air volume measuring systems from the perspective of the air volume measuring system and replace measuring elements, but practice proves that the problems cannot be fundamentally solved.
Disclosure of Invention
Aiming at the problems, the invention provides a square primary air duct flow equalizing device at a coal mill inlet, which improves the uniformity of a speed field and a temperature field at the cross section of an air quantity measuring element on a primary air mixing air duct and greatly reduces the difficulty of air quantity measurement by the design and application of a multi-channel type air duct flow mixer, a flow guide plate and an air flow distributor, thereby realizing the accurate measurement and control of the online primary air quantity on the premise of not replacing the original air quantity measuring system and laying a good foundation for the safe, environment-friendly and economic operation of a coal-fired boiler.
The utility model provides a square wind channel flow straightener of coal pulverizer entry which characterized in that: the cold air primary air channel comprises a square cold primary air channel and a square hot primary air channel, wherein the output end of the square cold primary air channel is provided with a cold primary air channel transition section with N sections of bulges, N is a natural number more than or equal to 2, the output end of the cold primary air channel transition section is communicated with the inlet of a cold primary air box, all the cold primary air boxes are transversely arranged in the section width area of the square hot primary air channel at intervals, the cold primary air box is positioned in the area of the air inlet section of the square hot primary air channel, the cold primary air box faces towards the hot air, the windward side of the hot air is an air guide cambered surface which is contracted from bottom to top, the air outlet end face of the cold primary air box deviating from the hot air is provided with a plurality of air box outlet clapboards which are arranged at intervals from bottom to top, a plurality of static mixing blades are arranged on the two sides of the air outlet end face from bottom to top, and are used for uniformly mixing the cold air flowing out of the, the rear section of the square primary hot air duct, which is opposite to the arrangement region of the primary cold air bellows, is provided with a bending region and a subsequent flow guide region, the bending region is provided with a plurality of arc-shaped guide plates corresponding to a height region, the radian direction of the arc-shaped guide plates is arranged at the radian radius of the height of the arc-shaped guide plates, an air flow distributor is arranged on the inner side of the air outlet region of the cavity of the subsequent flow guide region, and the air flow distributor is arranged in a shape of an inner cavity of the square primary hot air duct corresponding to the air duct.
It is further characterized in that:
the cold primary air duct transition section specifically comprises a first flaring guide section and a second separation transition section, the output end of the square cold primary air duct is connected with the small-area port of the first flaring guide section, the large-area end face of the first flaring guide section covers all the inlets of the second separation transition section, each second separation transition section comprises a bottom inlet end and an upper necking separation outlet, and an angularly arranged guide slope is arranged between the adjacent upper necking separation outlets to ensure the convenient and reliable entering of air flow;
the direction of the air box outlet partition plate of each cold primary air box is consistent, and the partition plates are all the partition plates which are arranged at a certain angle in a downward inclined mode from the inner end to the outer end;
the static mixing blades on each side of the air outlet end face of each primary air cooling bellows are blades deflected towards one side of the air outlet end face, the deflection directions of adjacent static mixing blades on the same side are different, and the deflection directions of the static mixing blades on different sides at the same height are the same, so that the gas flowing out of an outlet partition plate of the bellows is fully mixed;
and corresponding static mixing blades are respectively arranged at the corresponding positions on the two sides of each air box outlet partition plate, so that the mixing is sufficient and reliable.
After the invention is adopted, the cold primary air is firstly injected into the cold primary air bellows through the transition section of the cold primary air duct, the cold primary air bellows is positioned in the square hot primary air duct, the cold primary air is uniformly divided into N strands by the N cold primary air bellows, then the cold primary air is respectively divided into a plurality of strands through the bellows outlet partition plates by the tapered box body, and the cold primary air is uniformly distributed in the height or width direction of the hot primary air duct. The combined design of the air box outlet clapboards in the cold primary air box can ensure that the flow of the cold primary air entering the hot primary air channel is uniformly distributed, theoretically, the more the cold primary air is divided into more strands, the better the mixing effect of the cold primary air and the hot primary air is, the flaring design of the first flaring guide section of the transition section of the cold primary air channel can greatly reduce the pressure loss caused by the airflow uniform distributor, and the static mixing blades arranged on the two sides of the end surface of the air outlet from bottom to top can well enhance the mixing of the cold primary air and the hot primary air, so that the temperature field of the mixed air entering the coal mill is more uniform; the design and the application of the multi-channel air channel flow mixer, the flow guide plate and the air flow uniform distributor improve the uniformity of a speed field and a temperature field at the cross section of an air quantity measuring element on a primary air mixing air channel, greatly reduce the difficulty of air quantity measurement, realize the accurate measurement and control of the online primary air quantity on the premise of not needing to replace the original air quantity measuring system, and lay a good foundation for the safety, environmental protection and economic operation of a coal-fired boiler.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic perspective view of the duct of the present invention through which the cold primary air passes before mixing with the hot primary air;
the names corresponding to the sequence numbers in the figure are as follows:
the air flow distribution device comprises a square cold primary air duct 1, a square hot primary air duct 2, a bending area 21, a subsequent flow guide area 22, a cold primary air duct transition section 3, a first flaring guide section 31, a second separation transition section 32, a bottom inlet end 321, an upper necking separation outlet 322, a guide slope 33, a cold primary air bellows 4, an air guide cambered surface 41, an air outlet end surface 42, a bellows outlet partition plate 5, a static mixing blade 6, an arc-shaped flow guide plate 7 and an air flow uniform distributor 8.
Detailed Description
A square primary air duct flow equalizing device of a coal mill inlet is shown in figures 1 and 2: the cold primary air duct comprises a square cold primary air duct 1 and a square hot primary air duct 2, wherein the output end of the square cold primary air duct 2 is provided with a cold primary air duct transition section 3 with N sections of bulges, N is a natural number more than or equal to 2, the output end of each section of cold primary air duct transition section 3 is communicated with the inlet of a cold primary air bellows 4, all the cold primary air bellows 4 are transversely arranged in the cross-section width area of the square hot primary air duct 2 at intervals, the cold primary air bellows 4 are positioned in the air inlet area of the square hot primary air duct 2, the windward side of the cold primary air bellows 4 facing hot air is a wind guide cambered surface 41 necking from bottom to top, the air outlet end face 42 of the cold primary air bellows 4 departing from the hot air is provided with a plurality of bellows outlet clapboards 5 arranged at intervals from bottom to top, a plurality of static mixing blades 6 are arranged on the two sides of the air outlet end face 42 from bottom to top, and the static mixing blades 6 are used for uniformly mixing cold air flowing out from the adjacent, the rear section of the square primary hot air duct 2, which is opposite to the arrangement region of the primary cold air bellows 4, is provided with a bending region 21 and a subsequent flow guide region 22, the bending region 21 is provided with a plurality of arc-shaped guide plates 7 corresponding to the height region, the radian direction of the arc-shaped guide plates 7 is arranged at the radian radius of the height, the inner side of the air outlet region of the cavity of the subsequent flow guide region 22 is provided with an airflow uniform distributor 8, and the airflow uniform distributor 8 is arranged in a shape of the corresponding air duct inner cavity of the square primary hot air duct 2 in a copying manner.
The cold primary air duct transition section 3 specifically comprises a first flaring guide section 31 and second separation transition sections 32, the output end of the square cold primary air duct 1 is connected with the small-area port of the first flaring guide section 31, the large-area end face of the first flaring guide section 31 covers the inlets of all the second separation transition sections 32, each second separation transition section 32 comprises a bottom inlet end 321 and an upper necking separation outlet 322, and guide slopes 33 arranged at an angle are arranged between the adjacent upper necking separation outlets 322 to ensure the convenient and reliable entering of air flow;
the direction of the air box outlet baffle 5 of each cold primary air box 4 is consistent, and the baffle plates are all arranged at a certain angle in a downward inclined mode from the inner end to the outer end;
the static mixing blades 6 on each side of the air outlet end face 42 of each cold primary air bellow 4 are blades which deflect towards one side, the deflection directions of the adjacent static mixing blades 6 on the same side are different, and the deflection directions of the static mixing blades 6 on different sides at the same height are the same, so that the gas flowing out of the bellow outlet partition plate 5 is fully mixed;
the corresponding positions of the two sides of each air box outlet clapboard 6 are respectively provided with corresponding static mixing blades, so that the mixing is ensured to be sufficient and reliable.
In the specific embodiment, the output end of the square primary cold air duct 2 is provided with two sections of convex primary cold air duct transition sections 3, and the guide plate is arranged at the 90-degree turning air duct behind the mixed air duct to guide the mixed air flow. The air flow distributor is usually arranged above the air volume measuring element, the distance between the air flow distributor and the air volume measuring element is generally about 0.5m, the air flow distributor has the function of rectifying mixed air flow, provides a stable air flow field for the online measuring element and ensures that the measuring element is over against the incoming air flow.
From the angle of flow field optimal design, the primary air channel flow field at the inlet of the coal mill is improved, a stable and good-distribution-uniformity external environment of the flow field is provided for primary elements of a measuring device, and the problem that the primary air quantity at the inlet of the coal mill cannot be accurately measured and controlled is solved from the source.
The working principle is as follows, the cold primary air is injected into the cold primary air box through the cold primary air channel transition section, the cold primary air box is positioned in the square hot primary air channel, the N cold primary air boxes uniformly divide the cold primary air into N strands, then the cold primary air is divided into a plurality of strands through the gradually-shrinking box body through the air box outlet partition plate, and the cold primary air is uniformly distributed in the height or width direction of the hot primary air channel. The combined design of the air box outlet clapboards in the cold primary air box can ensure that the flow of the cold primary air entering the hot primary air channel is uniformly distributed, theoretically, the more the cold primary air is divided into more strands, the better the mixing effect of the cold primary air and the hot primary air is, the flaring design of the first flaring guide section of the transition section of the cold primary air channel can greatly reduce the pressure loss caused by the airflow uniform distributor, and the static mixing blades arranged on the two sides of the end surface of the air outlet from bottom to top can well enhance the mixing of the cold primary air and the hot primary air, so that the temperature field of the mixed air entering the coal mill is more uniform; the design and the application of the multi-channel air channel flow mixer, the flow guide plate and the air flow uniform distributor improve the uniformity of a speed field and a temperature field at the cross section of an air quantity measuring element on a primary air mixing air channel, greatly reduce the difficulty of air quantity measurement, realize the accurate measurement and control of the online primary air quantity on the premise of not needing to replace the original air quantity measuring system, and lay a good foundation for the safety, environmental protection and economic operation of a coal-fired boiler.
The primary air volume at the inlet of the coal mill is accurately measured and controlled, and a plurality of beneficial effects can be obtained:
1, the problem of distortion of the online measurement of the primary air quantity at the inlet of the coal mill, namely the problem that the direction of the online air quantity is opposite to that of the hot primary air, is thoroughly solved. The potential safety hazard of 'jumping grinding' caused by primary air quantity distortion at the inlet of the coal mill is eliminated, and the running safety of a unit is improved;
2, the primary air quantity of the inlet of the coal mill is measured on line to realize accurate measurement and control, the cold and hot primary air doors of the inlet of the coal mill can realize automatic operation, namely, the opening degree of the hot air door is completely adjusted according to the air quantity instruction of the coal mill, and the cold primary air door is adjusted according to the outlet temperature, so that the automatic operation level of a unit is improved, and the reliability of equipment is improved;
3 before the primary air volume of the coal mill inlet can not be accurately measured, in the daily operation, in order to ensure enough ventilation output of the coal mill, the primary air volume of the coal mill inlet is seriously higher, and the opening of the cold air door is larger. The online measurement of the primary air quantity of the coal mill inlet realizes accurate measurement and control, the primary air door of cold and hot is put into automatic operation, the primary air quantity of the coal mill inlet is completely controllable and is completely adjusted according to a primary air-coal curve, the primary air quantity of the coal mill inlet can be greatly reduced, the power consumption of a fan is effectively saved, the combustion working condition of a boiler is improved, the opening degree of the primary air door of cold is reduced, the smoke exhaust temperature of the boiler is reduced, and the primary air rate of the boiler is effectively reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a square wind channel flow straightener of coal pulverizer entry which characterized in that: the cold air primary air channel comprises a square cold primary air channel and a square hot primary air channel, wherein the output end of the square cold primary air channel is provided with a cold primary air channel transition section with N sections of bulges, N is a natural number more than or equal to 2, the output end of the cold primary air channel transition section is communicated with the inlet of a cold primary air box, all the cold primary air boxes are transversely arranged in the section width area of the square hot primary air channel at intervals, the cold primary air box is positioned in the area of the air inlet section of the square hot primary air channel, the cold primary air box faces towards the hot air, the windward side of the hot air is an air guide cambered surface which is contracted from bottom to top, the air outlet end face of the cold primary air box deviating from the hot air is provided with a plurality of air box outlet clapboards which are arranged at intervals from bottom to top, a plurality of static mixing blades are arranged on the two sides of the air outlet end face from bottom to top, and are used for uniformly mixing the cold air flowing out of the, the rear section of the square primary hot air duct, which is opposite to the arrangement region of the primary cold air bellows, is provided with a bending region and a subsequent flow guide region, the bending region is provided with a plurality of arc-shaped guide plates corresponding to a height region, the radian direction of the arc-shaped guide plates is arranged at the radian radius of the height of the arc-shaped guide plates, an air flow distributor is arranged on the inner side of the air outlet region of the cavity of the subsequent flow guide region, and the air flow distributor is arranged in a shape of an inner cavity of the square primary hot air duct corresponding to the air duct.
2. The square primary air duct flow straightener for the coal mill inlet of claim 1, wherein: the cold primary air duct transition section specifically comprises a first flaring guide section and a second separation transition section, the output end of the square cold primary air duct is connected with the small-area port of the first flaring guide section, the large-area end face of the first flaring guide section covers all the inlets of the second separation transition section, each second separation transition section comprises a bottom inlet end and an upper necking separation outlet, and a guide slope arranged in an angled mode is arranged between the adjacent upper necking separation outlets.
3. The square primary air duct flow straightener for the coal mill inlet of claim 1, wherein: and the direction of the air box outlet partition plate of each primary air cooling air box is consistent, and the partition plates are all the partition plates which are arranged at certain angles from the inner end to the outer end in a downward inclined mode.
4. The square primary air duct flow straightener for the coal mill inlet of claim 1, wherein: the static mixing blades on each side of the air outlet end face of each primary air cooling box are blades deflected towards one side, the deflection directions of adjacent static mixing blades on the same side are different, and the deflection directions of the static mixing blades on different sides at the same height are the same.
5. The square primary air duct flow straightener for a coal mill inlet of claim 4, wherein: and corresponding static mixing blades are respectively arranged at the corresponding positions on the two sides of each air box outlet clapboard.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010816733.8A CN112007746A (en) | 2020-08-14 | 2020-08-14 | Square primary air duct flow equalizing device at inlet of coal mill |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010816733.8A CN112007746A (en) | 2020-08-14 | 2020-08-14 | Square primary air duct flow equalizing device at inlet of coal mill |
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| CN202010816733.8A Pending CN112007746A (en) | 2020-08-14 | 2020-08-14 | Square primary air duct flow equalizing device at inlet of coal mill |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112844794A (en) * | 2020-12-02 | 2021-05-28 | 华电电力科学研究院有限公司 | Cold and hot primary air forced mixing system at inlet of double-inlet and double-outlet coal mill and method thereof |
| CN113218460A (en) * | 2021-05-21 | 2021-08-06 | 京仪股份有限公司 | Air volume measuring structure based on flow equalizing technology |
| CN113275117A (en) * | 2021-05-21 | 2021-08-20 | 京仪股份有限公司 | Primary air flow field adjusting structure based on flow equalizing technology |
| CN113843246A (en) * | 2021-10-09 | 2021-12-28 | 广东天赐湾实验室装备制造有限公司 | Be suitable for bellows and fume chamber of rectification |
| CN113983489A (en) * | 2021-10-09 | 2022-01-28 | 苏州西热节能环保技术有限公司 | Secondary air distribution method for active corrosion prevention of opposed firing boiler |
| CN115888963A (en) * | 2022-09-19 | 2023-04-04 | 山东大学 | Coal pulverizer entry primary air volume governing system |
-
2020
- 2020-08-14 CN CN202010816733.8A patent/CN112007746A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112844794A (en) * | 2020-12-02 | 2021-05-28 | 华电电力科学研究院有限公司 | Cold and hot primary air forced mixing system at inlet of double-inlet and double-outlet coal mill and method thereof |
| CN113218460A (en) * | 2021-05-21 | 2021-08-06 | 京仪股份有限公司 | Air volume measuring structure based on flow equalizing technology |
| CN113275117A (en) * | 2021-05-21 | 2021-08-20 | 京仪股份有限公司 | Primary air flow field adjusting structure based on flow equalizing technology |
| CN113843246A (en) * | 2021-10-09 | 2021-12-28 | 广东天赐湾实验室装备制造有限公司 | Be suitable for bellows and fume chamber of rectification |
| CN113983489A (en) * | 2021-10-09 | 2022-01-28 | 苏州西热节能环保技术有限公司 | Secondary air distribution method for active corrosion prevention of opposed firing boiler |
| CN113983489B (en) * | 2021-10-09 | 2024-01-19 | 苏州西热节能环保技术有限公司 | Secondary air distribution method for active corrosion prevention of opposed firing boiler |
| CN115888963A (en) * | 2022-09-19 | 2023-04-04 | 山东大学 | Coal pulverizer entry primary air volume governing system |
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