CN102679706A - Furnace smoke extraction lignite drying system of direct-blowing pulverizing system of double-inlet and double-outlet steel ball coal mill - Google Patents
Furnace smoke extraction lignite drying system of direct-blowing pulverizing system of double-inlet and double-outlet steel ball coal mill Download PDFInfo
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- CN102679706A CN102679706A CN2012101451875A CN201210145187A CN102679706A CN 102679706 A CN102679706 A CN 102679706A CN 2012101451875 A CN2012101451875 A CN 2012101451875A CN 201210145187 A CN201210145187 A CN 201210145187A CN 102679706 A CN102679706 A CN 102679706A
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Abstract
The invention relates to a furnace smoke extraction lignite drying system of a direct-blowing pulverizing system of a double-inlet and double-outlet steel ball coal mill. The furnace smoke extraction lignite drying system is simple in structure, low in investment cost, capable of improving the applicability of the pulverizing system to coal types, free of influence to the safety of a boiler, favorable for relieving high-temperature corrosion of a water-cooled wall and reducing NOx emission and the like and capable of increasing the lignite blending ratio to 0.4. The furnace smoke extraction lignite drying system comprises two recirculating pipelines which are connected with an economizer inlet flue of a tail shaft of the boiler, wherein each recirculating pipeline comprises a recirculating fan; an electric side plate gate I and an electric air damper are arranged at the junction of the recirculating fan and the economizer inlet flue; and an electric side plate gate II is arranged at the junction of the recirculating fan and a primary hot air pipeline.
Description
Technical field
The present invention relates to a kind of brown coal drying system, the dry brown coal of stove system is smoked by especially a kind of double-inlet double-outlet steel ball coal mill straight blowing type milling system.
Background technology
Since coal market price liberalization in 2006, electric coal price lattice rise on the way, and the bituminous coal price is up to eight, 900 yuan per ton, and " coal electric shaft " policy can not in time be implemented in addition, and thermoelectricity enterprise is in the heavy losses state.Brown coal than horn of plenty, are characterized in that moisture is big, fugitive constituent is high at China's reserves, and the brown coal price is lower, about about 400 yuan per ton.It is few that China used the power plant of brown coal in the past, begins to mix burning brown coal for reducing some units that use bituminous coal of cost of electricity-generating.Because brown coal moisture is bigger, mix the dry undercapacity of pulverized coal preparation system behind the burning brown coal, coal pulverizer goes out one's intention as revealed in what one says, the powder mixture temperature is on the low side (having only 55～60 ℃), has limited the ratio that burning brown coal is mixed in further increasing.
Thermal coal is by how much be divided into four types of its dry ash free basis volatile content: anthracite, meager coal, bituminous coal, brown coal.
Pulverized coal preparation system has numerous species, and at present operational performance is more and facts have proved it is that the pulverized coal preparation system of mature and reliable roughly has following several kinds: low speed coal mill bin storage type pulverizing system, medium-speed pulverizer unit pulverized-coal system, double-inlet double-outlet steel ball coal mill straight blowing type milling system, blower mill unit pulverized-coal system.Pulverized coal preparation system is not omnipotent, and not all coal can burn, and every kind of pulverized coal preparation system all has its suitable coal, is fit to use anthracite and low-volatile meager coal like the low speed coal mill bin storage type pulverizing system; The medium-speed pulverizer unit pulverized-coal system is fit to use the lower brown coal of high-volatile meager coal, bituminous coal and moisture; The double-inlet double-outlet steel ball coal mill straight blowing type milling system is fit to use anthracite, meager coal and bituminous coal; The blower mill unit pulverized-coal system is fit to use brown coal.
Build at first to confirm before the power plant this power plant after building up the coal that will use, promptly so-called design coal is then according to the suitable pulverized coal preparation system of this coal selection.Can not all use design coal for various reasons after power plant builds up, need mix and burn other coals, need transform original pulverized coal preparation system in case of necessity.Certainly; The transformation amount is more little, transformation back system is good more simply more, and more complicated its security of pulverized coal preparation system and stability are poor more, in old unit, use more such as the low speed coal mill bin storage type pulverizing system; But because of its system is too complicated, newly-built power plant seldom uses this system.
The prior art brief account that can improve the brown coal mixed-fuel burning proportion is following: be provided with pre-drying device in the double-inlet and double-outlet steel ball coal mill import, coal is undertaken predrying by drier in pre-drying device before getting into coal pulverizer.Drier mixes by three ones: high temperature furnace cigarette, low-temperature furnace smoke and cold weary gas.Bottom sides in pre-drying device is provided with exhaust outlet, and weary gas is extracted the back out from above-mentioned exhaust outlet and got into deduster (weary gas is mixed by flue gas, water vapour, fugitive constituent, pulverized coal particle etc.), and deduster is collected the pulverized coal particle in the weary gas.The weary gas of removing pulverized coal particle is divided into two-way through weary gas blower fan after the deduster sucking-off: the one tunnel directly gets into desulfurizing tower, and one the tunnel gets into weary gas cooler.Weary gas is removed moisture and lowered the temperature and is divided into two-way again after cold weary gas blower fan is extracted out in weary gas cooler: the one tunnel advances desulfurizing tower, and one the tunnel advances flue gas mixing-chamber.Hot blast and cold flue gas are mixed the back and are got into coal pulverizer.
Though this prior art can be mixed burning brown coal even whole burning brown coal by vast scale; But roughly there is the following shortcoming in it: the high temperature furnace cigarette that 1, extracts boiler furnace mixes the back with the cold smoke that extracts from boiler flue and carries out predrying to coal; Contain unburnt pulverized coal particle in the high temperature furnace cigarette, pulverized coal particle is drawn out of and not only wastes fuel but also bigger to the boiler combustion influence.2, in pre-drying device, carry out predrying to coal; At first moisture is evaporated out; Yet the fugitive constituent in the coal unavoidably also can be separated out a part, and the fugitive constituent heat is high, be prone to catch fire, and catching fire of coal and after-flame are had very great help; This a part of fugitive constituent of the prior art finally enters atmosphere with weary gas through desulfurizing tower, and is very uneconomical.3, system is too complicated, and equipment is numerous.Such as need deduster, weary gas cooler, weary gas blower fan, cold weary gas blower fan, cold flue gas blower fan or the like are set, this makes initial cost or improvement expenses huge.4, many weeks, pulverized coal preparation system is more complicated, and then the trouble point is many more, and its stability, reliability are low more, overhauls, maintenance workload is big.For example, the deduster of this prior art needs maintenance if damaging; Then weary gas can not be removed pulverized coal particle and directly get into desulfurizing tower and then be discharged in the atmosphere through chimney; Though desulfurizing tower can be removed the part pulverized coal particle, but still can bring the waste of environmental pollution and fuel; If weary gas cooler damages, the moisture in the then weary gas can not be removed, and does not reach the effect of recycle-water for another example.5, one of drying medium part is the high temperature furnace cigarette; High temperature furnace cigarette temperature is more than 1000 ℃; Far exceed 600 ℃ of the temperature extremes that existing steel can bear, need through adding the insulation material head it off, but steel pipe inwall insulation material comes off in actual motion easily at the steel pipe inwall; High-temperature flue gas can cause steel pipe to damage after insulation material came off, and then caused unit by forced-stopping machine.6, this prior art is provided with three kinds of blower fans: weary gas blower fan, cold weary gas blower fan, cold smoke blower fan, station service in service can increase greatly.7, the double-inlet double-outlet steel ball coal mill straight blowing type milling system of this prior art and active service differs greatly, if the active service unit is mixed the burning brown coal transformation, the renovation technique difficulty is big, improvement expenses is high.8, new power plant construction such as the need brown coal that all burn; Blower mill or medium-speed pulverizer unit pulverized-coal system are the most suitable pulverized coal preparation systems that uses brown coal of generally acknowledging and facts have proved; The unit that uses brown coal that is now moving almost all adopts blower mill or medium-speed pulverizer unit pulverized-coal system; As adopt the mentioned pulverized coal preparation system burning brown coal of this prior art not have what advantage to say; And the not enforcement of this prior art, its security, economy, stability are still waiting the check of time.
Summary of the invention
The objective of the invention is for overcoming above-mentioned prior art problems, provide a kind of double-inlet double-outlet steel ball coal mill straight blowing type milling system to smoke the dry brown coal of stove system.Its system is simple; Investment cost is not high; Can improve the adaptability of pulverized coal preparation system to coal; To the not influence of boiler safety property, all be favourable alleviating the burner hearth coking, alleviating aspects such as water wall high temperature corrosion and reduction NOx discharging, can brown coal be mixed burning and be increased to 0.4 than (mixing the ratio of amount with the boiler fired coal total amount of burning brown coal).
For realizing above-mentioned purpose, the present invention adopts following technical proposals:
The dry brown coal of stove system is smoked by a kind of double-inlet double-outlet steel ball coal mill straight blowing type milling system; It comprises two recirculating lines that are connected with the economizer gas approach of boiler tail vertical shaft; Every recirculating line all comprises a recirculation blower, and recirculation blower and economizer gas approach junction are provided with electronic insertion plate door I, motorized adjustment air door; Be provided with electronic insertion plate door II at recirculation blower and heat primary air pipeline junction.
Said recirculation blower is arranged on the ground, boiler room.
The dry brown coal of stove system is smoked by double-inlet double-outlet steel ball coal mill straight blowing type milling of the present invention system, comprises two recirculation blowers, two motorized adjustment air doors, four electronic insertion plate doors, some wear-resistant bends and some circular straighttubes.The moderate oven cigarette is extracted out from the economizer gas approach of boiler tail vertical shaft and arranged on left and right sides; (flue gas is little negative pressure in the economizer gas approach after the heat primary air pipeline adds pulverized coal preparation system through the recirculation blower pressurization; The hot blast meter pressure is tens kPas in the heat primary air pipeline, and flue gas needs with adding the heat primary air pipeline after the recirculation blower pressurization).The later pulverized coal preparation system of heat primary air pipeline access point remains unchanged, and this pulverized coal preparation system is the cold primary air fan pressurized direct pulverizing coal system of double-inlet and double-outlet steel ball coal mill.
The present invention can improve the adaptability of pulverized coal preparation system to coal: also bituminous coal, brown coal are mixed burning but can burn bituminous coal separately.Then only need to close electronic insertion plate door I and electronic insertion plate door II if burn bituminous coal separately, cut off recirculation blower and get final product, switch flexibly.Extract the stove cigarette from the economizer gas approach, stove cigarette extraction amount is little, and little to the boiler combustion influence, the reduced air acc power is little, and is easy to implement, with the obvious advantage.Recirculation blower is if need maintenance, can overhaul after closing electronic insertion plate door I and electronic insertion plate door II, and the extraction amount of stove cigarette is regulated through the motorized adjustment air door.Extract the scheme of flue gas compares with the scheme from one-sided extraction from the economizer gas approach of boiler tail vertical shaft and arranged on left and right sides; Little to flue gas flow field influence in the boiler tail vertical shaft; And high (another also can move two typhoon machines two typhoon machine operational reliabilitys if one needs maintenance than a typhoon machine; Just brown coal are mixed and are burnt than can be reduced), so adopt the scheme that extracts flue gas from the economizer gas approach of boiler tail vertical shaft and arranged on left and right sides.
The present invention and prior art maximum different be following some:
(1) take out the stove smoke point and be selected in boiler tail vertical shaft economizer inlet flue duct, extracting the stove cigarette is the moderate oven cigarette, and temperature is less than 500 ℃; Be lower than 600 ℃ of the temperature extremes that steel can bear; Take out stove smoke pipe road and be easy to realize, do not need to add insulation material, security of operation, stable at inner-walls of duct.
(2) the moderate oven cigarette adds pulverized coal preparation system through the heat primary air pipeline, and system is simple, and reliability is high.
(3) the present invention is easy to realize.Active service double-inlet double-outlet steel ball coal mill straight blowing type milling system only need increase by two recirculating lines can realize that brown coal mix burning, and the renovation technique difficulty is little, improvement expenses is low, the transformation cycle short.
(4) heat is the branch grade, and the temperature grade of high heat more is high more.High-temperature flue gas belongs to the high-grade heat, and this prior art extracts the predrying brown coal of high-grade heat, and this part heat can not be used for heating superheated steam and reheated steam can cause unit efficiency to reduce, and the high-temperature flue gas of extraction multicomputer efficient more reduces many more.The present invention extracts the dry brown coal of tow taste heat and can not cause unit efficiency to reduce.
The invention has the beneficial effects as follows: adopt said system; Can make coal pulverizer import desiccant temperature improve 20 ℃, coal pulverizer goes out one's intention as revealed in what one says, the powder mixture temperature improves 12～13 ℃, and brown coal are mixed and burnt than being increased to 0.4; Can alleviate the burner hearth coking, alleviate water wall high temperature corrosion and reduce the NOx discharging.The present invention can make about 1,986 ten thousand yuan of the annual cost saving of a 300MW unit.
Description of drawings
Fig. 1 is a system schematic of the present invention.
Wherein, 1. economizer, 2. electronic insertion plate door I, 3. motorized adjustment air door, 4. recirculation blower, 5. electronic insertion plate door II, 6. air preheater, 7. primary air fan, 8. heat primary air pipeline, 9. double-inlet and double-outlet steel ball coal mill.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
As shown in Figure 1; It comprises two recirculating lines that are connected with economizer 1 gas approach of boiler tail vertical shaft; Every recirculating line all comprises a recirculation blower 4, and recirculation blower 4 is provided with electronic insertion plate door I2, motorized adjustment air door 3 with economizer 1 gas approach junction; Be provided with electronic insertion plate door II5 in recirculation blower 4 and heat primary air pipeline 8 junctions.
The moderate oven cigarette is extracted out from economizer 1 gas approach of boiler tail vertical shaft and arranged on left and right sides, through being arranged in ground recirculation blower 4 pressurizations in boiler room after heat primary air pipeline 8 adds pulverized coal preparation system.The later pulverized coal preparation system of heat primary air pipeline 8 access points remains unchanged.
Claims (3)
1. the dry brown coal of stove system is smoked by a double-inlet double-outlet steel ball coal mill straight blowing type milling system; It is characterized in that; It comprises two recirculating lines that are connected with the economizer gas approach of boiler tail vertical shaft; Every recirculating line all comprises a recirculation blower, and recirculation blower and economizer gas approach junction are provided with electronic insertion plate door I, motorized adjustment air door; Be provided with electronic insertion plate door II at recirculation blower and heat primary air pipeline junction.
2. the dry brown coal of stove system is smoked by double-inlet double-outlet steel ball coal mill straight blowing type milling as claimed in claim 1 system; It is characterized in that; The moderate oven cigarette is extracted out from the economizer gas approach of boiler tail vertical shaft and arranged on left and right sides, pressurizes after the heat primary air pipeline adds pulverized coal preparation system through recirculation blower.
3. the dry brown coal of stove system is smoked by double-inlet double-outlet steel ball coal mill straight blowing type milling as claimed in claim 1 system, it is characterized in that said recirculation blower is arranged on the ground, boiler room.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101451875A CN102679706A (en) | 2012-05-10 | 2012-05-10 | Furnace smoke extraction lignite drying system of direct-blowing pulverizing system of double-inlet and double-outlet steel ball coal mill |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101451875A CN102679706A (en) | 2012-05-10 | 2012-05-10 | Furnace smoke extraction lignite drying system of direct-blowing pulverizing system of double-inlet and double-outlet steel ball coal mill |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819458A (en) * | 2021-11-01 | 2021-12-21 | 西安热工研究院有限公司 | System and method for improving drying output of medium-speed coal mill based on medium-temperature furnace smoke extraction |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GR1000397B (en) * | 1988-05-03 | 1992-06-30 | Ici Plc | Cleaning agent for dentine surfaces |
| JP2000081209A (en) * | 1998-09-04 | 2000-03-21 | Ishikawajima Harima Heavy Ind Co Ltd | Fine powder coal fired boiler mill primary air control method and device |
| CN101358735A (en) * | 2008-09-27 | 2009-02-04 | 东北电力科学研究院有限公司 | Explosion-proof processing method of medium-storage type bituminous coal boiler and special system thereof |
| CN201582846U (en) * | 2010-01-05 | 2010-09-15 | 华北电力科学研究院有限责任公司 | Combustion control system of lignite unit |
| CN202018186U (en) * | 2011-03-25 | 2011-10-26 | 华北电力大学（保定） | System using boiler flue gas waste heat for drying brown coal |
| CN202562296U (en) * | 2012-02-24 | 2012-11-28 | 湖北钟祥华帮科技有限公司 | Nitrogen isolation protection device in intermediate frequency furnace for producing vanadium and nitrogen alloys |
-
2012
- 2012-05-10 CN CN2012101451875A patent/CN102679706A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GR1000397B (en) * | 1988-05-03 | 1992-06-30 | Ici Plc | Cleaning agent for dentine surfaces |
| JP2000081209A (en) * | 1998-09-04 | 2000-03-21 | Ishikawajima Harima Heavy Ind Co Ltd | Fine powder coal fired boiler mill primary air control method and device |
| CN101358735A (en) * | 2008-09-27 | 2009-02-04 | 东北电力科学研究院有限公司 | Explosion-proof processing method of medium-storage type bituminous coal boiler and special system thereof |
| CN201582846U (en) * | 2010-01-05 | 2010-09-15 | 华北电力科学研究院有限责任公司 | Combustion control system of lignite unit |
| CN202018186U (en) * | 2011-03-25 | 2011-10-26 | 华北电力大学（保定） | System using boiler flue gas waste heat for drying brown coal |
| CN202562296U (en) * | 2012-02-24 | 2012-11-28 | 湖北钟祥华帮科技有限公司 | Nitrogen isolation protection device in intermediate frequency furnace for producing vanadium and nitrogen alloys |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819458A (en) * | 2021-11-01 | 2021-12-21 | 西安热工研究院有限公司 | System and method for improving drying output of medium-speed coal mill based on medium-temperature furnace smoke extraction |
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Application publication date: 20120919 |