CN104776224A - Medium-speed coal mill air ring dynamic and static clearance sealing device - Google Patents
Medium-speed coal mill air ring dynamic and static clearance sealing device Download PDFInfo
- Publication number
- CN104776224A CN104776224A CN201510053266.7A CN201510053266A CN104776224A CN 104776224 A CN104776224 A CN 104776224A CN 201510053266 A CN201510053266 A CN 201510053266A CN 104776224 A CN104776224 A CN 104776224A
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- CN
- China
- Prior art keywords
- sealing plate
- dynamic
- medium
- vane
- static gaps
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a medium-speed coal mill air ring dynamic and static clearance sealing device. The sealing device mainly comprises an air ring dynamic and static clearance sealing plate and a sealing plate supporting device; on the edge of an inlet of an existing coal mill air ring, a ring of sealing plate is added and is fixed by virtue of the supporting device; a sealing clearance between the sealing plate and the inner wall of a primary air chamber is controlled at around 5-10mm which is no more than the air ring dynamic and static clearance; to prevent the accumulation of pebble coal and coal particles on the sealing plate, the sealing plate is inclined by 15 degrees or more than 15 degrees relative to the horizontal plane. The sealing device disclosed by the invention can prevent the increase in air leakage from the dynamic and static clearance of the coal mill in case that the air ring dynamic and static clearance of the coal mill is increased due to abrasion in long-term running, so as to stabilize the air speed on the outlet of the air ring and to avoid the increase in the discharge rate and the calorific value of the pebble coal.
Description
Technical field
The invention belongs to mechanical assembly field, relate to the seal arrangement of medium-speed pulverizer vane dynamic and static gaps.
Background technique
Due to the needs of actual machine structure, between vane edge and coal pulverizer internal face, there is dynamic and static gaps in the rotary wind ring of medium-speed pulverizer.First air is via an air compartment, and a part is upwards blown out by rotary wind ring, holds up the pulverized coal particle that mill bowl edge overflows, and another part First air laterally can be spilt by dynamic and static gaps.Position coal powder density residing for dynamic and static gaps is high, wind speed is large, temperature is high, after medium-speed pulverizer runs a period of time, dynamic and static gaps can increase because of wearing and tearing, the ratio that First air is spilt from dynamic and static gaps increases, reduce rotary wind ring air outlet velocity, the ability of air-flow support coal particle is declined, and this causes the one of the main reasons that coal pulverizer stone coal discharge rate increases and pebble coal calorific value increases.
Stone coal discharge rate increases and pebble coal calorific value increases, and can make pulverizer capacity reduction, Economy variation, stone coal discharge workload increases simultaneously.A large amount of pebble coals flows through vane and mill bowl differential pressure also will be caused to increase, in addition, if stone coal discharge too much and pile up, under the hot environment of a coal pulverizer air compartment, may cause spontaneous combustion for a long time, thus cause device damage.The adjusting method of usual reduction pebble coal amount is improve the primary air flow of coal pulverizer, and this can make the primary air velocity of boiler-burner increase, and to a certain degree affects the normal combustion of coal dust in burner hearth.
Summary of the invention
The object of the invention is to increase to solve the rotary wind ring dynamic and static gaps related in background technique the problem causing vane air outlet velocity to reduce, the invention provides a kind of seal arrangement of medium-speed pulverizer vane dynamic and static gaps, can under the prerequisite not affecting coal pulverizer vane mechanical structure, reduce the ratio that First air spills from vane dynamic and static gaps, improve vane air outlet velocity, reduce stone coal discharge.
The technical solution adopted for the present invention to solve the technical problems:
The present invention includes vane dynamic and static gaps sealing plate and sealing plate support device;
Described sealing plate is fixed on vane entrance outward edge, and simultaneously bottom sealing plate, arrange support device, sealing plate and support device are welded on vane entrance outward edge jointly, in order to increase sealing plate Mechanical Structure Strength.Described sealing plate can rotate together along with mill bowl when coal pulverizer runs, and the seal clearance between sealing plate and First air chamber interior walls controls at about 5 ~ 10mm.
Described seal clearance width is not more than the width of vane dynamic and static gaps.
Described sealing plate is horizontal by a level inclination, and this level inclination is greater than 15 °.
The material of described sealing plate and support device is identical with vane restrictor ring, is Wear Resisting Steel.
Described sealing plate and support device all adopt welding manner to install.
Described sealing plate thickness be more than or equal to 5mm.
Conveniently sealing plate processing and installation, described sealing plate can be divided into multistage, every section in circular arc, be welded as annulus when installing in coal pulverizer, the quantity of segmentation determines with installation conditions by processing.
Beneficial effect of the present invention is as follows:
After coal pulverizer runs a period of time, vane dynamic and static gaps can increase because of wearing and tearing, causes the inleakage at dynamic and static gaps place to increase, reduces vane air outlet velocity.At the main for once wind in the sealing plate place of an air compartment installation, almost do not have the wearing and tearing of coal grain and coal dust, the degree of wear is by the dynamic and static gaps far below vane top.
The present invention after increasing, can prevent coal pulverizer dynamic and static gaps inleakage from increasing because of long-time running wearing and tearing at coal pulverizer vane dynamic and static gaps, thus stablizes vane air outlet velocity, avoids stone coal discharge rate and pebble coal calorific value to increase.
Accompanying drawing explanation
Fig. 1 is HP medium-speed pulverizer structural representation, and the enlarged fragmentary portion at vane place is cardinal principle schematic diagram of the present invention.
In figure, 1, mill bowl; 2, vane outlet; 3, restrictor ring; 4, vane dynamic and static gaps; 5, First air chamber interior walls; 6, vane entrance; 7, support device; 8, sealing plate; 9, seal clearance.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, the seal arrangement of medium-speed pulverizer vane dynamic and static gaps, comprise vane dynamic and static gaps sealing plate 8 and sealing plate support device 7.
At vane entrance 6 outward edge that existing coal pulverizer rotates jointly with mill bowl 1, increase by circle sealing plate 8 and a support device 7.
Described sealing plate 8 is fixed on vane entrance 6 edge, and bottom sealing plate 8, arrange support device 7, sealing plate 8 and support device 7 are welded on vane entrance 6 outward edge jointly simultaneously.In order to increase the Mechanical Structure Strength of sealing plate 8.
Described sealing plate 8 can rotate along with mill bowl 1 together when coal pulverizer runs; for ensureing normal mechanical motion; and it is excessive to prevent from leaking out; seal clearance 9 between sealing plate 8 and First air chamber interior walls 5 controls at about 5 ~ 10mm; seal clearance 9 width of the medium speed grinding of different model has certain difference, but is not more than the width of vane dynamic and static gaps 4.
Described sealing plate 8 may have pebble coal when coal pulverizer runs and coal grain is piled up, and for preventing the generation of accumulation situation, sealing plate 8 should have certain level inclination, and level inclination inclination angle should be greater than 15 °.
Described sealing plate 8 adopts the Wear Resisting Steel identical with vane restrictor ring 3 with the material suggestion of supporting structure 7, sealing plate 8 and support device 7 all adopt welding manner to install, for ensureing structural strength, sealing plate 8 thickness should 5mm and more than, the conveniently processing of sealing plate 8 and installation, sealing plate 8 can be divided into multistage, and every section in circular arc, be welded as annulus when installing in coal pulverizer, the quantity of segmentation determines with installation conditions by processing.
Working procedure of the present invention is as follows:
After the invention process, when coal pulverizer runs, seal clearance 9 and dynamic and static gaps 4 form two seals link.After coal pulverizer long-time running, dynamic and static gaps 4 is easily worn and increases, but seal clearance 9 is not easily worn, and can prevent dynamic and static gaps 4 inleakage from increasing, thus stablizes vane and export 2 wind speed, avoids stone coal discharge rate and pebble coal calorific value to increase.
Claims (7)
1. the seal arrangement of medium-speed pulverizer vane dynamic and static gaps, it is characterized in that comprising vane dynamic and static gaps sealing plate and sealing plate support device;
Described sealing plate is fixed on vane ingress edge, simultaneously bottom sealing plate, arranges support device, in order to increase sealing plate Mechanical Structure Strength; Described sealing plate can rotate together along with rotating grinding bowl when coal pulverizer runs, and the seal clearance between sealing plate and First air chamber interior walls controls at 5 ~ 10mm.
2. the seal arrangement of medium-speed pulverizer vane dynamic and static gaps as claimed in claim 1, is characterized in that described seal clearance width is not more than the width of vane dynamic and static gaps.
3. the seal arrangement of medium-speed pulverizer vane dynamic and static gaps as claimed in claim 1, it is characterized in that described sealing plate is horizontal by a level inclination, and this level inclination is greater than 15 °.
4. the seal arrangement of medium-speed pulverizer vane dynamic and static gaps as claimed in claim 1, is characterized in that the material of described sealing plate and support device is identical with vane restrictor ring, is Wear Resisting Steel.
5. the seal arrangement of medium-speed pulverizer vane dynamic and static gaps as claimed in claim 1, is characterized in that described sealing plate and support device all adopt welding manner to install.
6. the seal arrangement of medium-speed pulverizer vane dynamic and static gaps as claimed in claim 1, it is characterized in that described sealing plate thickness be more than or equal to 5mm.
7. the seal arrangement of medium-speed pulverizer vane dynamic and static gaps as claimed in claim 1, is characterized in that described sealing plate can be divided into multistage, and every section is circular arc, and be welded as annulus when installing in coal pulverizer, the quantity of segmentation determines with installation conditions by processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510053266.7A CN104776224A (en) | 2015-02-02 | 2015-02-02 | Medium-speed coal mill air ring dynamic and static clearance sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510053266.7A CN104776224A (en) | 2015-02-02 | 2015-02-02 | Medium-speed coal mill air ring dynamic and static clearance sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104776224A true CN104776224A (en) | 2015-07-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510053266.7A Pending CN104776224A (en) | 2015-02-02 | 2015-02-02 | Medium-speed coal mill air ring dynamic and static clearance sealing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN104776224A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812949A (en) * | 2017-02-14 | 2017-06-09 | 陕西渤兴电力科技有限公司 | A kind of corrugated pull rod seal device of coal pulverizer |
| CN115463736A (en) * | 2022-06-01 | 2022-12-13 | 浙江浙能兰溪发电有限责任公司 | Wing-shaped air ring of coal mill |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5127590A (en) * | 1991-04-09 | 1992-07-07 | March-Sourthwestern Corp. | Rotating throat/air port ring assembly |
| CN201807407U (en) * | 2010-09-10 | 2011-04-27 | 浙江省电力试验研究院 | Improved structure of medium-speed coal mill |
| CN102896023A (en) * | 2012-10-23 | 2013-01-30 | 中国神华能源股份有限公司 | Bowl type coal mill |
| CN103418483A (en) * | 2013-08-29 | 2013-12-04 | 济钢集团有限公司 | Abrasion-resistant impeller device of medium speed coal mill |
| CN203342912U (en) * | 2013-05-24 | 2013-12-18 | 唐山冀东装备工程股份有限公司 | Air ring sealing device for vertical roller mill |
| CN204553847U (en) * | 2015-02-02 | 2015-08-12 | 浙江大学 | A kind of seal arrangement of medium-speed pulverizer vane dynamic and static gaps |
-
2015
- 2015-02-02 CN CN201510053266.7A patent/CN104776224A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5127590A (en) * | 1991-04-09 | 1992-07-07 | March-Sourthwestern Corp. | Rotating throat/air port ring assembly |
| CN201807407U (en) * | 2010-09-10 | 2011-04-27 | 浙江省电力试验研究院 | Improved structure of medium-speed coal mill |
| CN102896023A (en) * | 2012-10-23 | 2013-01-30 | 中国神华能源股份有限公司 | Bowl type coal mill |
| CN203342912U (en) * | 2013-05-24 | 2013-12-18 | 唐山冀东装备工程股份有限公司 | Air ring sealing device for vertical roller mill |
| CN103418483A (en) * | 2013-08-29 | 2013-12-04 | 济钢集团有限公司 | Abrasion-resistant impeller device of medium speed coal mill |
| CN204553847U (en) * | 2015-02-02 | 2015-08-12 | 浙江大学 | A kind of seal arrangement of medium-speed pulverizer vane dynamic and static gaps |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812949A (en) * | 2017-02-14 | 2017-06-09 | 陕西渤兴电力科技有限公司 | A kind of corrugated pull rod seal device of coal pulverizer |
| CN115463736A (en) * | 2022-06-01 | 2022-12-13 | 浙江浙能兰溪发电有限责任公司 | Wing-shaped air ring of coal mill |
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| PB01 | Publication | ||
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Application publication date: 20150715 |