CN1066072C - Process for powdering system of bituminous coal - Google Patents
Process for powdering system of bituminous coal Download PDFInfo
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- CN1066072C CN1066072C CN92106120A CN92106120A CN1066072C CN 1066072 C CN1066072 C CN 1066072C CN 92106120 A CN92106120 A CN 92106120A CN 92106120 A CN92106120 A CN 92106120A CN 1066072 C CN1066072 C CN 1066072C
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Abstract
The present invention belongs to fireproof anti-explosion technology for a powder making system by bituminous coal, which is particularly to suitable for a powder making system by bituminous coal blown by a large-size blastfurnace. Fire and explosion accidents usually occur in a powder making system by bituminous coal. The present invention uses exhaust gas of a hot air furnace and smoke gas of a combustion furnace for drying and conveying coal powder, so the entire powder making system runs in inerting atmosphere. The present invention also adopts a static electricity and spark preventing device and is provided with a nitrogen cleaning pipe or a steam fire-extinguishing system in a key position of the system. An oxygen analyser is arranged at the end of the system, and a thermoscope is arranged at a main dangerous point. The present invention has simple technology and ensures the safety of the system as well as the stability of operation and the flexibility for handling failure.
Description
The invention belongs to the fireproof preventing bursting process of powdering system of bituminous coal, be specially adapted to the pulverized coal preparation system of large blast furnace blowing bituminous coal.
Pulverized coal preparation system includes coal pulverizer, mill separator, cyclone separator and sack cleaner, and equipment such as row's coal air-introduced machine, and pulverized coal preparation system often takes place that bituminous coal catches fire and accident such as blast.Coal dust explosion has just taken place during blast furnace blowing bituminous coal test in 1964 in U.S. Armco Steel Corp., and similar situation also once took place in 1964 in Anshan Iron and Steel Company.Converted the dry pulverized coal conveying of air with the combustion furnace flue gas in the past, 800 ℃ of combustion furnace flue-gas temperatures, oxygen content 13% is converted behind the air 260 ℃ of mist temperature, oxygen content 18%～19%.Make system's oxygen content surpass 12%, the blast of catching fire easily.Secondary row coal air-introduced machine makes and is easy to produce malleation in the sack cleaner system in the pulverized coal preparation system, leaks the spontaneous combustion of powder deposition in the system.In addition, recirculation level pipeline accumulated powder spontaneous combustion.The coal dust movement velocity is fast in the pipeline, locates very easily to produce electrostatic spark, firing coal-dust at flange of each container, pipeline etc.Above various reasons will cause the whole system blast of catching fire.The explosion accident that the power plant powdering system of bituminous coal takes place is of common occurrence especially.The problem that the powdering system of bituminous coal fireproof preventing bursting process occurs is the one of the main reasons before the Chinese large-sized blast furnace blowing bituminous coal technical stagnation not.
The present invention has done improvement at the fire-proof and explosion-proof problem of powdering system of bituminous coal, successfully develops the fireproof preventing bursting process of large blast furnace blowing bituminous coal pulverized coal preparation system.
Main points of the present invention are that whole pulverized coal preparation system is moved in inerting atmosphere, use blast-furnace hot-air furnace exhaust and combustion furnace flue gas drying pulverized coal conveying (seeing accompanying drawing 1 declaratives), control pulverized coal preparation system atmosphere oxygen content is below 12%, minimum reaching below 6%, thus guarantee that system realizes fire-proof and explosion-proof purpose.
Used two blast-furnace hot-air furnace exhausts enter pulverized coal preparation system by two-way respectively; Hot blast waste gas is supplied with by the hot-blast stove of two blast furnaces, and when one seat blast furnace staying or blowing out, auto switching is to another blast funnace hot blast stove; Air mixes in waste gas when preventing changing-over stove, the pipe that leaks informaton of hot-blast stove vent valve is directly received in the chimney gone, and has reduced the fluctuation of oxygen content in the waste gas; Inlet at coal pulverizer adopts hermetic buried plate formula feeder, makes the air leak rate of air curtain of system reduce 10～15%; The good oxygen analyser of terminal installation capability of pulverized coal preparation system, this oxygen analyser is highly sensitive, energy continuous detecting, record and warning.
Pulverized coal preparation system has also adopted full vacuum operation, arranging the end (seeing accompanying drawing 2) that the coal air-introduced machine is installed in whole pulverized coal preparation system, has significantly reduced sack cleaner leakage powder and whole workshop factory building and has accumulated coal dust; Compare with similar pulverized coal preparation system, cancellation secondary row coal air-introduced machine, equipment investment can reduce by 5～7%, the cancellation recirculation conduit, the bituminous coal spontaneous combustion, the blast (sum up according to the parties concerned, the rate of setting off an explosion of recirculation conduit reaches 32%) that cause owing to the recirculation conduit accumulated powder have been eliminated up hill and dale.Also installed the facility of antistatic spark at pulverized coal preparation system, each pipeline of system and each container is all has the place of flange all with metal it to be linked up, complete set altogether is equipped with 60 pairs of such devices; Total system is installed earth connection, and its earth resistance is less than 4 ohm.
In addition, just in case it is when finding that burning things which may cause a fire disaster is arranged, explosion-proof in system for fire extinguishing in time, at system's main hazard point thermo detector is installed, and is had and write down and overtemperature alarm; The nitrogen purge pipe is installed at the system core position; At system entry big flow nitrogen device is installed, is further obtained enough inert atmospheres when accident condition and start, the shutdown for coal pulverizer; Each rupture pressure disc area carries out science and calculates; Mainly deposit the powder container and be provided with nitrogen or steam annihilator; Each night shift room of system is equipped with the ventilation unit that prevents anoxic, can prevent effectively that nitrogen from suffocating, to ensure the post workers'health.
Technological process of the present invention is simple, has guaranteed the security of powdering system of bituminous coal, the stability and the flexibility of failure treatment of production operation.The winding-up of Anshan iron and steel plant large blast furnace uses the present invention to grind a large amount of intense explosion bituminous coal (containing volatile matter more than 28%) with the pulverized coal preparation system of bituminous coal, and any fault does not take place pulverized coal preparation system.
Description of drawings:
Accompanying drawing 1 is exhaust gas of hot-blast stove utilization figure.
1,2 is No. 10, No. 11 blast funnace hot blast stoves among the figure, and the waste gas of these two hot-blast stoves was discharged to atmosphere by chimney 3 originally, air-introduced machine 12 now is installed waste gas is sent into pulverized coal preparation system makes powder process carrier and the fire-proof and explosion-proof usefulness of inerting.Waste gas enters air-introduced machine 12 by valve 6,7,8,9 and bloats by valve 10,11 backs and divides two-way to enter pulverized coal preparation system: one tunnel process waste gas header 21, valve 22 directly enter pulverized coal preparation system 24; Another road enters coal pulverizer inlet pulverized coal preparation system 24 through valve 13,14,17, smoke induced draught fan 18, valve 19, hot-blast main 20, valve 23.
Accompanying drawing 2 is flouring technology flow charts.
Its flow process is: raw coal transportation send by burying Scraper 26 behind run coal bin 25 To coal pulverizer 27, enter simultaneously mill from waste gas header 35 and hot-blast main's 36 hot blast Coal machine 27, the coal dust after grinding are successively by mill separator 28, primary cyclone 29, behind secondary cyclone 30 and the sack cleaner 31, coal dust falls after collecting Enter Pulverized Coal Bin 32, be transported to each blast furnace blowing station by cone pump 33 again, remove through cloth bag The tail wind of dirt device is arranged coal air-introduced machine 34 to drain into atmosphere.
In the accompanying drawing 2 34 row coal air-introduced machine is original secondary row coal air-introduced machine position, after the cancellation of secondary row coal air-introduced machine, moves on to this position once arranging the coal air-introduced machine.37 is the recirculation conduit valve, cancels.38 is wood block separator.
Claims (3)
1, a kind of fireproof preventing bursting process of powdering system of bituminous coal is characterized in that used two blast-furnace hot-air furnace exhausts enter pulverized coal preparation system by two-way respectively: one tunnel process waste gas header (21), valve (22) directly enter pulverized coal preparation system (24); Another road is through valve (13), (14), (17), smoke induced draught fan (18), valve (19), hot-blast main (20), valve (23) enters coal pulverizer inlet pulverized coal preparation system (24), exhaust gas of hot-blast stove is supplied with by two blast funnace hot blast stoves, when one seat blast furnace staying or blowing out, auto switching is to the hot-blast stove of another blast furnace, the pipe that leaks informaton of hot-blast stove vent valve is directly received in the chimney and gone, in pulverized coal preparation system, row's coal air-introduced machine is installed in the end of whole pulverized coal preparation system, also installed the facility of antistatic spark at pulverized coal preparation system, each pipeline of system has the place of flange all with metal it to be linked up with each container is all, total system is installed earth connection, the nitrogen purge pipe is installed at the system core position, at system entry big flow nitrogen device is installed, mainly deposit the powder container and be provided with extinguishing device, each night shift room of system is equipped with the ventilation unit that prevents anoxic.
2,, it is characterized in that the said powder container extinguishing device of depositing is the nitrogen extinguishing device according to the said bituminous coal milling fireproof preventing bursting process of claim 1.
3,, it is characterized in that said powder storing device extinguishing device is a steam annihilator according to the said bituminous coal milling fireproof preventing bursting process of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92106120A CN1066072C (en) | 1992-04-06 | 1992-04-06 | Process for powdering system of bituminous coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92106120A CN1066072C (en) | 1992-04-06 | 1992-04-06 | Process for powdering system of bituminous coal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1065817A CN1065817A (en) | 1992-11-04 |
| CN1066072C true CN1066072C (en) | 2001-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92106120A Expired - Fee Related CN1066072C (en) | 1992-04-06 | 1992-04-06 | Process for powdering system of bituminous coal |
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| Country | Link |
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| CN (1) | CN1066072C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538491A (en) * | 2012-01-31 | 2012-07-04 | 首钢总公司 | System and method utilizing flue duct waste gas of hot air furnace to bake and preheat charging of blast furnace |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076636C (en) * | 1999-12-29 | 2001-12-26 | 宝山钢铁股份有限公司 | Tail gas recirculation system for coal injection and pulverization of blast furnace and its control method |
| CN100400996C (en) * | 2006-07-19 | 2008-07-09 | 山东天力干燥设备有限公司 | Nitrogen circulating coal powder air flow internal heating fluidized bed drying technology |
| CN100443840C (en) * | 2006-09-20 | 2008-12-17 | 山东天力干燥设备有限公司 | High volatile coal dust rotary drying process |
| CN102177406B (en) * | 2008-08-12 | 2013-11-06 | 施维英生物泥公司 | Closed loop drying system and method |
| CN102174663B (en) * | 2011-01-18 | 2013-05-01 | 中冶赛迪工程技术股份有限公司 | Blast-furnace coal injection pulverization flue gas system and control method thereof |
| CN102302878A (en) * | 2011-01-20 | 2012-01-04 | 徐州中矿奥特麦科技有限公司 | Inerting protection device for dust remover |
| CN104251490A (en) * | 2013-06-27 | 2014-12-31 | 同方环境股份有限公司 | Crushing pretreatment system for hazardous wastes |
| CN105886682A (en) * | 2015-01-26 | 2016-08-24 | 鞍钢股份有限公司 | Safety interlocking method for pulverized coal pulverizing system |
| CN104971820B (en) * | 2015-07-17 | 2017-12-12 | 江苏大唐国际吕四港发电有限责任公司 | A kind of pulverized coal preparation system and its control method using vibrator |
| CN108072552B (en) * | 2017-11-17 | 2024-02-27 | 长沙开元仪器有限公司 | Coal sample pulverizing equipment and pulverizing method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1021484C (en) * | 1988-07-26 | 1993-06-30 | 戈拉弗伯尔 | Repairing method for refractory lining and equipment thereof |
-
1992
- 1992-04-06 CN CN92106120A patent/CN1066072C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1021484C (en) * | 1988-07-26 | 1993-06-30 | 戈拉弗伯尔 | Repairing method for refractory lining and equipment thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538491A (en) * | 2012-01-31 | 2012-07-04 | 首钢总公司 | System and method utilizing flue duct waste gas of hot air furnace to bake and preheat charging of blast furnace |
| CN102538491B (en) * | 2012-01-31 | 2013-10-30 | 首钢总公司 | System and method utilizing flue duct waste gas of hot air furnace to bake and preheat charging of blast furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1065817A (en) | 1992-11-04 |
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