CN102600932B - Sealing gas layout structure of coal grinding mill - Google Patents
Sealing gas layout structure of coal grinding mill Download PDFInfo
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- CN102600932B CN102600932B CN201210049257.7A CN201210049257A CN102600932B CN 102600932 B CN102600932 B CN 102600932B CN 201210049257 A CN201210049257 A CN 201210049257A CN 102600932 B CN102600932 B CN 102600932B
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- coal pulverizer
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Abstract
The invention discloses a sealing gas layout structure of a coal grinding mill, which comprises a coal grinding mill (1), wherein a rotary gas separator (2), a grinding disc (3) and a grinder roll (4) are arranged on the coal grinding mill (1), auxiliary sealing gas and a circulating air system and a hot air system are connected with the coal grinding mill (1), nitrogen seal is arranged at a dynamic ring and a static ring of the rotary gas separator (2) and air sealing (6) is arranged at a static ring of the grinding disc (3). The adoption of the sealing gas layout structure can reduce the amount added into a seal air fan of the coal grinding mill without affecting the sealing effect, can reduce the use amount of nitrogen gas to improve sealing air pressure, and at the same time can reduce fuel consumption and protect the coal grinding mill, so as to overcome the shortcomings that the sealing gas layout structure in the prior art has high energy consumption and excessive input cost, has an impact on normal operation, is harmful to the environment and the like.
Description
Technical field
The present invention relates to a kind of sealing gas arrangement of coal pulverizer, belong to coal pulverizer equipment technical field.
Background technology
Coal-grinding unit is the powder process workshop section of coal gasification apparatus, the satisfactory broken coal of granularity enters battery limit (BL) through storing belt transport, with lime stone according to a certain percentage, under inert environments and tiny structure condition, to be milled in coal pulverizer and dry, the coal dust that granularity is qualified is delivered to subsequent cell and is used.The broken coal that upstream process adds and lime stone are polished in coal pulverizer, the high-temperature dry air that fuel gas produces after Combustion of Hot Air Furnace takes coal pulverizer out of by after fine coal drying, because the coal particle diameter after grinding is very little, for guaranteeing the sealing of coal pulverizer moving region, currently used sealing is respectively aeroseal and nitrogen-sealed.The air that existing seal air fan adds is mainly used in the gap sealed between the dynamic and static ring of coal pulverizer mill and rotary separator.In coal mill system startup procedure, once start seal air fan, the oxygen content of system just sharply raises, and must add a large amount of nitrogen could drop to less than 8% oxygen content.And the pressure reduction of sealing air and systemic circulation wind does not reach 2KPA, sealing effectiveness also can be caused bad, the coal dust in coal pulverizer can be made to emerge from the gap location of mill stationary ring and rotating ring, damage coal pulverizer.
Find in actual motion, the air capacity that seal air fan adds is very many, and system oxygen content can only by adding nitrogen to maintain within 8% in a large number.And we also find in process of production, once a large amount of nitrogen adds system, while oxygen content declines, pulverizer outlet temperature about decline 5-10 DEG C very soon, temperature reduces, and pulverized coal water content does not reach requirement, for improving temperature, diesel oil quantity delivered must be increased about 5-10Kg/S, the gas emptying amount of simultaneously discharging from atmospheric valve is also increasing.Consume a large amount of nitrogen in whole process, turn increase Fuel Consumption simultaneously.Most the underlying cause is exactly adding in a large number due to sealing air.How to add air less as far as possible, thus reduce nitrogen use level, also reduce the consumption of fuel, to reach energy-conservation object, be then the technical barrier of solution of the present invention simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is to provide one can reduce sealing air use amount, thus reduces the sealing gas arrangement of the coal pulverizer of nitrogen use level and heat energy, can overcome the deficiencies in the prior art.
Technical scheme of the present invention is; It comprises coal pulverizer, coal pulverizer is provided with rotary separator, mill and grinding roller, coal pulverizer is connected with auxiliary blanket gas, wind circulating system and hot-air system, it is characterized in that: be provided with nitrogen-sealed at the dynamic and static ring place of rotary separator, be provided with aeroseal at the stationary ring place of mill.
Coal pulverizer is connected with nitrogen gas supply pipe.
In coal pulverizer, oxygen content is not higher than 8%.
Be connected to nitrogen-sealed on coal pulverizer and the air impervious air pressure level pressure height 2KPa than coal pulverizer inside.
Compared with the prior art, the present invention is in order to solve described technical problem:
The first, the oxygen main source in certainty annuity:
1, combustion air is added during hot stove burner fuel combustion excessive
2, system air-tightness is bad
3, the sealing air that coal pulverizer mill and rotary separator add is sealed
In coal-grinding commissioning process, carry out the comparison of several operating mode, unit is standard cube m/h.
1, circulating fan startup, seal fan and combustion air blower fan all stop, and system will maintain oxygen content needs the nitrogen amount added to be about 10000-12000 cubic meter/hours below 8%.
2, after starting seal air fan, maintain system oxygen content needs the nitrogen amount added to be about 14000-16000 cubic meter/hours below 8%.
3, after startup combustion air blower fan is also lighted a fire and thrown coal, nitrogen use amount is increased to 14500-16500 cubic meter/hours.
Find from above comparative result, burning wind is when adding, and system held oxygen content needs the nitrogen that adds and seldom, only 500 cubic metres/hours.It is exactly after seal air fan starts that system adds time nitrogen amount changes greatly.Need the nitrogen added into about 4000 cubic metres/hours.When not affecting coal pulverizer sealing effectiveness, add air to system less as far as possible.Reduce by 2000 cubic metres/hours to major general's nitrogen use amount.
By above-mentioned monitoring, applicant thinks that the way of the use amount reducing nitrogen is at present exactly that the air quantity added by seal air fan reduces when not affecting sealing effectiveness as far as possible.And the air that existing seal air fan adds is divided into two-way, a road sealing coal pulverizer mill, another road seal rotary separator.Consider that often someone patrols and examines at mill place, security standpoint consideration air is as sealing gas.And rotary separator place is the position that whole system negative pressure is larger, sealing gas is very little toward the probability of outward leakage, and stops herein this position no one.Applicant is to determine to change the sealing gas at rotary separator place into nitrogen-sealed in the aforesaid specific case, and sealing air, only as the sealing gas at mill place, to reduce the air capacity added to system, can also improve the pressure of mill place sealing air simultaneously.
According to applicant's statistics, the nitrogen amount that device transformation advances into coal pulverizer is 8500 cubic metres/left and right per hour, and whole gasification system low pressure nitrogen tolerance used is about 13000 cubic metres/left and right per hour.
After adopting the present invention, whole gasification system low pressure nitrogen tolerance used is about 11000 cubic metres/left and right per hour, the nitrogen amount entering coal pulverizer is 4500 cubic metres/left and right per hour, about decrease with regard to coal pulverizer about 4000 cubic metres/per hour, in fact the nitrogen amount saved is 13000-11000=2000 cubic meter/left and right per hour, and other 2000 cubic metres/nitrogen hourly enters coal mill system from rotary separator as sealing gas.1 year can save the low-pressure nitrogen amount of being about according to calculating in 300 days is 1440000 standard cubic meters.Therefore adopt the present invention can reduce the energy consumption level of equipment, ensure the stable operation of coal mill system, there is good economy, society and environmental benefit, and to similar chemical project, there is reference and directive significance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
Embodiment: as shown in Figure 1, coal pulverizer 1 is provided with rotary separator 2, mill 3 and ink roller 4, what be connected with lime stone 7 and coal dust 8 at coal pulverizer 1 is mixed into mouth, and fine breeze outlet 9 after being connected with grinding thereon, simultaneously for realizing the normal operation of coal pulverizer 1, coal pulverizer 1 is connected with auxiliary blanket gas, wind circulating system and hot-air system, wherein blanket gas comprises nitrogen-sealed and aeroseal, coal is leaked for preventing the gap place of coal pulverizer 1, be connected to the pressure height 2KPa of air pressure level than coal pulverizer 1 inside of nitrogen-sealed 5 on coal pulverizer 1 and aeroseal 6.Be provided with nitrogen-sealed 5 at the dynamic and static ring place of the rotary separator 2 of coal pulverizer 1, be provided with aeroseal 6 at the stationary ring place of mill 3.Simultaneously for guaranteeing that in coal pulverizer 1, oxygen content is not higher than 8%, with nitrogen, oxygen in it need be discharged, coal pulverizer 1 is connected with nitrogen gas supply pipe.
Claims (2)
1. the sealing gas arrangement of a coal pulverizer, it comprises coal pulverizer (1), coal pulverizer (1) is provided with rotary separator (2), mill (3) and grinding roller (4), coal pulverizer (1) is connected with auxiliary blanket gas, wind circulating system and hot-air system, it is characterized in that: be provided with nitrogen-sealed (5) at the dynamic and static ring place of rotary separator (2), be provided with aeroseal (6) at the stationary ring place of mill (3); Coal pulverizer (1) is connected with nitrogen gas supply pipe; In coal pulverizer (1), oxygen content is not higher than 8%.
2. the sealing gas arrangement of coal pulverizer according to claim 1, is characterized in that: be connected to the pressure height 2kPa that the air pressure level of nitrogen-sealed (5) on coal pulverizer (1) and aeroseal (6) is more inner than coal pulverizer (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210049257.7A CN102600932B (en) | 2012-02-29 | 2012-02-29 | Sealing gas layout structure of coal grinding mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210049257.7A CN102600932B (en) | 2012-02-29 | 2012-02-29 | Sealing gas layout structure of coal grinding mill |
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| CN102600932A CN102600932A (en) | 2012-07-25 |
| CN102600932B true CN102600932B (en) | 2014-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210049257.7A Active CN102600932B (en) | 2012-02-29 | 2012-02-29 | Sealing gas layout structure of coal grinding mill |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107890915A (en) * | 2017-12-29 | 2018-04-10 | 贵州天福化工有限责任公司 | The mill rod sealing system of coal pulverizer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3854666A (en) * | 1973-01-29 | 1974-12-17 | Gilbert Associates | Process for pulverizing coal to ultrafine size |
| JP3292496B2 (en) * | 1992-02-26 | 2002-06-17 | バブコック日立株式会社 | Crushing mill for coal-fired boiler |
| CN201823584U (en) * | 2010-09-26 | 2011-05-11 | 安徽晋煤中能化工股份有限公司 | Sealing air inlet device of coal mill |
| CN202460742U (en) * | 2012-02-29 | 2012-10-03 | 贵州天福化工有限责任公司 | Sealed gas distributing structure of coal mill |
-
2012
- 2012-02-29 CN CN201210049257.7A patent/CN102600932B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3854666A (en) * | 1973-01-29 | 1974-12-17 | Gilbert Associates | Process for pulverizing coal to ultrafine size |
| JP3292496B2 (en) * | 1992-02-26 | 2002-06-17 | バブコック日立株式会社 | Crushing mill for coal-fired boiler |
| CN201823584U (en) * | 2010-09-26 | 2011-05-11 | 安徽晋煤中能化工股份有限公司 | Sealing air inlet device of coal mill |
| CN202460742U (en) * | 2012-02-29 | 2012-10-03 | 贵州天福化工有限责任公司 | Sealed gas distributing structure of coal mill |
Non-Patent Citations (3)
| Title |
|---|
| EM型磨煤机与烟煤制粉;陈亚、张建胜;《江苏冶金》;20060809;第34卷(第3期);第23至25页 * |
| MPS212中速磨煤机分离器齿轮箱进粉的处理;韩修成、郑中甫;《热力发电》;20100806;第39卷(第5期);第66至68页 * |
| 平盘式磨煤机故障原因探讨;刘红辉、杨为雄;《冶金丛刊》;20040420;第150卷(第2期);第13至14页 * |
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| CN102600932A (en) | 2012-07-25 |
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