CN102840595A - Fume pre-dried lignite medium speed mill straight-blowing powder-making system - Google Patents

Fume pre-dried lignite medium speed mill straight-blowing powder-making system Download PDF

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Publication number
CN102840595A
CN102840595A CN2011101665051A CN201110166505A CN102840595A CN 102840595 A CN102840595 A CN 102840595A CN 2011101665051 A CN2011101665051 A CN 2011101665051A CN 201110166505 A CN201110166505 A CN 201110166505A CN 102840595 A CN102840595 A CN 102840595A
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China
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coal
medium
speed pulverizer
flue gas
drying
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Pending
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CN2011101665051A
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Chinese (zh)
Inventor
施大钟
施登宇
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SHANGHAI YUANMENG ELECTRICITY ENERGY TECHNOLOGY CONSULTING CENTER
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Shanghai Electric Power Generation Equipment Co Ltd
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Priority to CN2011101665051A priority Critical patent/CN102840595A/en
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Abstract

The invention discloses a fume pre-dried lignite medium speed mill straight-blowing powder-making system. According to the system, a drying device is connected with a coal inlet at the top part of a medium speed mill; a coal inlet and a high temperature fume drying agent inlet are arranged at the top part of the drying device; a coal outlet is arranged at the bottom of the drying device; an exhaust port is arranged at a side plane of the bottom of the drying device; a dust collector is connected with the exhaust port; a power outlet of the dust collector is connected with a coal inlet of a medium speed mill; and an exhaust fan is connected with an air outlet of the dust collector. With the adoption of the system, the use of a medium speed mill powder-making system in a combustion high moisture lignite unit becomes possible; the blending combustion of lignite of a large ratio or complete lignite combustion in a fuel coal unit which adopts a straight-blowing medium speed mill powder-making system can be realized; the efficiency of the unit is further increased and the coal consumption in power generation is reduced; and meanwhile a great quantity of water resource can be recycled, so that the system has remarkable economic, energy-saving and environmental-friendly benefits.

Description

The predrying brown coal medium-speed pulverizer of flue gas unit pulverized-coal system
Technical field
The invention belongs to the coal fired power generation technical field, relate to the brown coal generation technology.Specifically, the pulverized coal preparation system that relates to coal-fired power station boiler.
Background technology
Brown coal are the minimum pit coals of degree of coalification, are peat depositions after dehydration, compacting change the initial stage product of organic-biological rock into, because of appearance is brown or crineous is gained the name.Brown coal account for 18% of China's thermal coal reserves, mainly are distributed in areas such as the Inner Mongol, three provinces in the northeast of China and Yunnan.Brown coal have volatile matter height (V Daf>37%) characteristics such as moisture high (total moisture is about 30%, and free moisture surpasses 19% mostly), caloric value low (about 12.56MJ/kg), ash fusion point low (about 1150 ℃), low (HGI is 50-70) of abrasiveness and easy spontaneous combustion.The characteristics of brown coal " two Senior Three are low " have determined that its pulverized coal preparation system has certain particularity.
Brown coal are mainly used in Power Plant Fuel, also can be used for fields such as chemical industry.The brown coal generating is widely used in developed countries such as Australia, Germany, the U.S..Research points out that the brown coal behind the burning drying and upgrading can improve unit efficiency, reduce the power consumption of subsidiary engines such as air-introduced machine, coal pulverizer, thereby reduces gross coal consumption rate, simultaneously to reducing CO 2, NO xDischarging is also played a role.
At present, domestic electric coal strained market supply, state's ore deposit electricity coal price lattice are high.For ensureing the long-term stability supply of electric coal, and control Power Plant Fuel cost, a large amount of power plant begin to explore and test in all kinds of coal-fired units, to mix to burn cheap brown coal.Higher and inflammable and explosive because of brown coal moisture, so becoming, dry undercapacity of pulverized coal preparation system and explosion of Coal Pulverizing System hidden danger restricts the key factor that burning brown coal is mixed by power plant.
In the station boiler pulverized coal preparation system, the difference of the maximum of all kinds of pulverized coal preparation systems is the coal pulverizer type.The coal pulverizer of widely using at present mainly contains low speed coal mill, medium-speed pulverizer and blower mill three major types.Advantages such as wherein medium-speed pulverizer is low because of the powder process power consumption, maintenance workload is little, the varying duty performance is good are widely used in burning smoke coal and the meager coal unit, and part low moisture brown coal unit also adopts medium-speed pulverizer powder process.
Medium-speed pulverizer one well matched unit pulverized-coal system.The state of its internal desiccant when working according to medium-speed pulverizer, be divided into malleation direct-firing with direct-firing two types of negative pressure.In the direct-firing system of negative pressure; Dispose Powder discharging fan behind the coal pulverizer; Coal pulverizer is worked under negative pressure state, helps avoiding coal pulverizer to leak powder to environment, but all are gone into the stove coal dust and all pass through Powder discharging fan; The Powder discharging fan functional reliability is relatively poor, so the direct-firing medium-speed pulverizer pulverized coal preparation system of present negative pressure is relatively more rare.In the pressurized direct pulverizing coal system of extensive use at present, generally adopt high pressure sealing wind to avoid coal pulverizer to leak powder to environment.Different according to the position of primary air fan, malleation is direct-firing can be divided into heat primary air machine system and cold primary air fan system again.
As shown in Figure 1; The direct-firing heat primary air mechanism of existing medium-speed pulverizer malleation powder system; During this system works, raw coal is sent into medium-speed pulverizer 3 from run coal bin 1 through weighing coal feeder 2 and is ground, and the wind powder mixture after grinding gets into mill separator 4; Isolated meal returns coal pulverizer 3 again to be continued to grind, and qualified coal dust and a wind are sent to each burner 6 and spray into boiler 7 internal combustion after pulverized coal distributor 5 distributes.The air preheater 8 heating backs that air is sent in the boiler flue by pressure fan 9 are divided into two-way through hot air duct 10; One the tunnel gets into medium-speed pulverizer 3 as drier and a wind after 11 superchargings of heat primary air machine, another road is sent to each burner 6 as secondary wind through secondary air box 12 distribution and is participated in burning.Seal fan 13 provides high pressure cold wind to be used for Seal of Equipment such as coal pulverizer, feeder.Coal pulverizer drier initial temperature is regulated through heat primary air machine 11 preceding cold-air flaps 40.
Above-mentioned medium-speed pulverizer pulverized coal preparation system is to adopt hot blast as drying medium, and hot blast temperature is 350~450 ℃ of scopes.A large amount of brown coal are mixed and are burnt test and confirmed already, adopts 350~450 ℃ hot blast to be difficult to satisfy the dry demand of high-moisture brown coal as drier, and the further raising of hot blast temperature receive the restriction of air preheater 8 and medium-speed pulverizer 3 safe operations.Therefore, dry undercapacity is the key factor that restriction medium-speed pulverizer pulverized coal preparation system is mixed burning brown coal.The dry undercapacity of pulverized coal preparation system not only makes the coal powder performance variation, also influences coal pulverizer simultaneously and grinds to exert oneself and cause boiler output lower, makes to mix to burn to lose meaning.
Summary of the invention
Technical problem to be solved by this invention provides the predrying brown coal medium-speed pulverizer of a kind of flue gas unit pulverized-coal system; This system makes combustion brown coal unit adopt the medium-speed pulverizer pulverized coal preparation system to become possibility; Vast scale be can be implemented in the coal-fired unit that adopts direct-firing medium-speed pulverizer pulverized coal preparation system and burning brown coal or clean burn brown coal mixed; Also can improve unit efficiency and reduce gross coal consumption rate, reclaim great lot of water resources, have remarkable economical, energy-conservation and environmental benefit.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
The predrying brown coal medium-speed pulverizer of a kind of flue gas unit pulverized-coal system, it includes medium-speed pulverizer, pulverized coal distributor, pressure fan, seal fan and is located at the air preheater in the boiler flue, and said pulverized coal distributor is connected between the mill separator and boiler-burner of medium-speed pulverizer outlet; Said pressure fan connects air preheater; Air preheater divides two-way, and one the tunnel connects burner, and another road connects the air inlet of medium-speed pulverizer bottom; Said seal fan connects the sealing air port of medium-speed pulverizer; It is characterized in that: said medium-speed pulverizer is connected with drying device at the coal feed point at top, and said drying device top has coal feed point and high temperature flue gas drying agent inlet, and the bottom has coal outlet; Bottom sides has exhaust outlet; Said exhaust outlet is connected with deduster, and the meal outlet of deduster connects the coal feed point of medium-speed pulverizer, and the gas outlet of deduster is connected with weary gas blower fan.
Through being set before medium-speed pulverizer, a drying device utilize high-temperature flue gas to carry out predrying to brown coal; Can promptly realize and in the coal-fired unit that adopts direct-firing medium-speed pulverizer pulverized coal preparation system, to have mixed burning brown coal or clean burn brown coal by vast scale so that the moisture in the brown coal reduces to adapt to the operating mode of medium-speed pulverizer like this; Brown coal are through after predrying, and weary G&W branch does not get into boiler furnace, has improved coal powder performance, has improved the efficient of boiler, can reduce the power consumption of blower fan, medium-speed pulverizer simultaneously, thereby reduce gross coal consumption rate.
Said weary gas blower fan connects weary gas cooler again, and said weary air cooling but utensil has condensation-water drain and cold weary gas outlet.Can the heat and the moisture that lack in the gas be recycled like this.Weary gas cooler is set, and the condensed water of separating out can also be recycled, and helps the conserve water resource.
Perhaps said weary gas blower fan directly connects desulfurizing tower.Direct moisture weary gas is discharged into desulfurizing tower like this, avoids the weary direct emptying contaminated environment of gas.
For realizing that the temperature that gets into the high-temperature flue gas in the drying device is regulated; The high temperature flue gas drying agent of said drying device inlet is connected with flue gas mixing-chamber, and the cold weary gas that the hot cigarette that this flue gas mixing-chamber is connected at boiler furnace is respectively taken out mouthful with weary gas cooler exports.The cold weary gas that can directly utilize system to produce is like this regulated high-temperature flue-gas.In addition, the flue gas mixing-chamber hot cigarette that can also be connected at boiler furnace is taken out and mouthful is taken out mouth with the cold smoke of being located at boiler flue.
In addition, said cold weary gas outlet is also connected to desulfurizing tower, causes the pollution to environment to avoid weary gas emptying.
Description of drawings
Through the description of its exemplary embodiment being carried out below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the present invention will become apparent and understand easily.
Fig. 1 is the structural representation of the direct-firing heat primary air mechanism of the medium-speed pulverizer malleation of prior art powder system;
Fig. 2 is a system architecture sketch map of the present invention.
The specific embodiment
As shown in Figure 2, the predrying brown coal medium-speed pulverizer of flue gas of the present invention unit pulverized-coal system comprises run coal bin 1, weighing coal feeder 2; Medium-speed pulverizer 3, pulverized coal distributor 5, air preheater 8, pressure fan 9; Secondary air box 12, seal fan 13, drying device 14, flue gas mixing-chamber 15; Sack cleaner 16, weary gas blower fan l7, weary gas cooler 18.The top outlet of medium-speed pulverizer 3 has mill separator 4.
Wherein, drying device 14 is descending drying tube, and the top has coal feed point and high temperature flue gas drying agent inlet, and the bottom has coal outlet, has exhaust outlet in bottom sides.The coal outlet of run coal bin 1 bottom connects weighing coal feeder 2, and weighing coal feeder 2 connects the coal feed point at drying device 14 tops again.Flue gas mixing-chamber 15 is connected the high temperature flue gas drying agent inlet on drying device 14 tops.The coal outlet of drying device 14 connects the coal feed point of medium-speed pulverizer 3, and the mill separator 4 of medium-speed pulverizer 3 connects pulverized coal distributor 5, and pulverized coal distributor 5 connects the burner 6 of boiler 7 again.
Air preheater 8 is arranged in the flue of boiler 7; Pressure fan 9 is positioned at outside the flue of boiler 7; Be connected with air preheater 8, through 10 fens two-way of air supply duct, the one road is connected to the air inlet of medium-speed pulverizer 3 bottoms to air preheater 8 again; Another road is through the burner 6 of secondary air box 12 connection boilers 7, and seal fan 13 is connected on the sealing air port of medium-speed pulverizer 3.
Connect sack cleaner 16 on the exhaust outlet of drying device 14; The meal outlet of sack cleaner 16 connects the coal feed point of medium-speed pulverizer 3; The gas outlet of sack cleaner 16 connects weary gas blower fan 17, and this weary gas blower fan 17 connects and lacks gas cooler 18, or directly will lack gas and be discharged into desulfurizing tower 22.Weary gas cooler 18 is heat exchangers, has the cooling water tube bank in it, and weary air cooling but utensil has condensation-water drain 21 and cold weary gas outlet.
Flue gas mixing-chamber 15 has two gas approach; One of them gas approach through stove smoke pipe road 20 connect boilers 7 burner hearths hot cigarette take out mouthfuls 24, another connects cold weary gas outlet (also can be connected to cold smoke in the flue of boiler 7 take out mouthful 41) of weary gas cooler 18 through cold blast pipe road 20.The cold weary gas outlet of weary gas cooler 18 (combines the valve on the cold blast pipe road) through cold blast pipe road 20 and divides two-way, and one the tunnel connects another gas approach of flue gas mixing-chamber 15, and another road can be connected to desulfurizing tower 22.
The air inlet the place ahead that is positioned at medium-speed pulverizer 3 at hot air duct also is provided with cold-air flap 40.
More than be exactly the predrying brown coal medium-speed pulverizer of flue gas of the present invention unit pulverized-coal system, its working method is following:
Raw coal is sent into drying device 14 from run coal bin 1 through weighing coal feeder 2, and the high-temperature flue gas from flue gas mixing-chamber 15 gets in the drying device 14 as the pre-dried drier of raw coal simultaneously, and the two mixes in drying device 14 and be descending.Most of coal grain gets into medium-speed pulverizer 3 by drying device 14 bottoms, and weary gas is extracted out to being lacked gas blower fan 17 by drying device 14 bottom sides.A small amount of duff grain in the weary gas reclaims and sends back to medium-speed pulverizer 3 by sack cleaner 16, and the weary gas after the purification gets into weary gas cooler 18 water that is cooled and is cooled to below the water dew point temperature through wall-type heat exchange.The weary gas sensible heat and the vapour latent heat that reclaim in the weary gas cooler 18 all return power plant's steam-water circulation system through cooling water; The condensate that water recovery produces in the weary gas is discharged into the desulfurizing tower wastewater disposal basin; Also can after water treatment, recycle; The weary gas part of the low temperature of discharging is returned flue gas mixing-chamber 15 as temperature control medium, and remaining part is sent to desulfurizing tower of electric power plant 22.Weary gas blower fan 17 is set, in order to extract the high temperature furnace cigarette in the drying device 14 and to overcome sack cleaner 16 and the resistance of weary gas cooler 18 and corresponding pipeline between sack cleaner 16 and weary gas cooler 18.
Grind in medium-speed pulverizer 3 through pre-dried raw coal; Wind powder mixture after grinding gets into mill separator 4; Isolated meal returns medium-speed pulverizer 3 to be continued to grind, and qualified coal dust and coal pulverizer drier (hot blast) are sent to each burner 6 and spray into the boiler internal combustion after pulverized coal distributor 5 distributes.The air of carrying by pressure fan 9 through air preheater 8 heating backs one tunnel be sent to medium-speed pulverizer 3 (cold primary air fan system) as wind and drier or by the supercharging of heat primary air machine after be sent to medium-speed pulverizer 3 (heat primary air machine system), another road is sent to each burner 6 participation stove internal combustion as secondary wind through secondary air box 12 distribution.Coal pulverizer drier initial temperature is regulated through cold-air flap 40 (heat primary air machine system) or pressure cold wind (cold primary air fan system).Seal fan 23 provides high pressure cold wind to be used for Seal of Equipment such as coal pulverizer, feeder.
At boiler furnace hot cigarette is set and takes out mouth 24, utilize negative pressure extracting high temperature furnace cigarette and the weary gas of low temperature in the drying device 14, the two mixes the back and gets into drying device 14 in flue gas mixing-chamber 15, regulate desiccant temperature through the ratio of adjusting high temperature furnace cigarette and cold weary gas.
Compare with existing medium-speed pulverizer pressurized direct pulverizing coal system, this patent system has following characteristics:
(1) predrying through efficient sufficient raw coal, the former moisture content of coal that gets into coal pulverizer significantly reduces, and the pulverized coal preparation system drying is exerted oneself and significantly improved, and makes combustion high-moisture brown coal unit can adopt medium-speed pulverizer pulverized coal preparation system safe and reliable to operation, that maintenance cost is low.
(2) adopt high-temperature flue gas as the pre-dried drier of raw coal, regulate the drier initial temperature through changing hot and cold cigarette ratio.The drying capacity adjustable range of high-temperature flue gas is big, can satisfy the predrying demand of all kinds of high-moisture raw coal; And the oxygen amount is low in the flue gas, can effectively prevent the brown coal detonation, and security is good.
(3) the predrying moisture that removes of raw coal does not get into boiler furnace, can significantly improve coal powder performance, improves boiler efficiency, reduces air-introduced machine, coal pulverizer power consumption, thereby reduces gross coal consumption rate.Reclaim the moisture in the predrying weary gas of raw coal, regional power plant has outstanding economy and environmental benefit for " rich coal lack of water ".
(4) for using as a servant the unit transformation; Only need set up drying device, sack cleaner, weary gas cooler, weary gas blower fan, high temperature boiler flue gas tube road and blast pipe road; Can make bituminous coal or meager coal medium-speed pulverizer pulverized coal preparation system safety, vast scale is mixed burning brown coal economically, and the pulverized coal preparation system operation characteristic remains unchanged basically before and after transforming.
Therefore; This pulverized coal preparation system makes combustion high-moisture brown coal unit adopt the medium-speed pulverizer pulverized coal preparation system to become possibility; Vast scale be can be implemented in the coal-fired unit that adopts direct-firing medium-speed pulverizer pulverized coal preparation system and burning brown coal or clean burn brown coal mixed; Also can improve unit efficiency and reduce gross coal consumption rate, reclaim great lot of water resources simultaneously, have remarkable economical, energy-conservation and environmental benefit.Native system both can be applicable to mix burning at the brown coal of labour unit, also can be applicable to the station boiler of whole burning high-moisture brown coal.
It should be noted that; Above content is to combine concrete embodiment to further explain that the present invention did; Can not assert that the specific embodiment of the present invention only limits to this; Under above-mentioned guidance of the present invention, those skilled in the art can carry out various improvement and distortion on the basis of the foregoing description, and these improve or distortion drops in protection scope of the present invention.

Claims (7)

1. the predrying brown coal medium-speed pulverizer of flue gas unit pulverized-coal system, it includes medium-speed pulverizer, pulverized coal distributor, pressure fan, seal fan and is located at the air preheater in the boiler flue, and said pulverized coal distributor is connected between the mill separator and boiler-burner of medium-speed pulverizer outlet; Said pressure fan connects air preheater; Air preheater divides two-way, and one the tunnel connects burner, and another road connects the air inlet of medium-speed pulverizer bottom; Said seal fan connects the sealing air port of medium-speed pulverizer; It is characterized in that: said medium-speed pulverizer is connected with drying device at the coal feed point at top, and said drying device top has coal feed point and high temperature flue gas drying agent inlet, and the bottom has coal outlet; Bottom sides has exhaust outlet; Said exhaust outlet is connected with deduster, and the meal outlet of deduster connects the coal feed point of medium-speed pulverizer, and the gas outlet of deduster is connected with weary gas blower fan.
2. the predrying brown coal medium-speed pulverizer of flue gas according to claim 1 unit pulverized-coal system is characterized in that: said weary gas blower fan connects weary gas cooler again, and said weary air cooling but utensil has condensation-water drain and cold weary gas outlet.
3. the predrying brown coal medium-speed pulverizer of flue gas according to claim 1 unit pulverized-coal system; It is characterized in that: the high temperature flue gas drying agent of said drying device inlet is connected with flue gas mixing-chamber, and the cold weary gas that the hot cigarette that this flue gas mixing-chamber is connected at boiler furnace top is respectively taken out mouthful with weary gas cooler exports.
4. the predrying brown coal medium-speed pulverizer of flue gas according to claim 1 unit pulverized-coal system; It is characterized in that: the high temperature flue gas drying agent of said drying device inlet is connected with flue gas mixing-chamber, and the hot cigarette that this flue gas mixing-chamber is connected at boiler furnace top is respectively taken out and mouthful taken out mouth with the cold smoke of being located at boiler flue.
5. the predrying brown coal medium-speed pulverizer of flue gas according to claim 3 unit pulverized-coal system is characterized in that: said cold weary gas outlet is also connected to desulfurizing tower.
6. the predrying brown coal medium-speed pulverizer of flue gas according to claim 1 unit pulverized-coal system, it is characterized in that: said weary air separator directly connects desulfurizing tower.
7. the predrying brown coal medium-speed pulverizer of flue gas according to claim 1 unit pulverized-coal system, it is characterized in that: said drying device is descending drying tube.
CN2011101665051A 2011-06-20 2011-06-20 Fume pre-dried lignite medium speed mill straight-blowing powder-making system Pending CN102840595A (en)

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
CN103148495A (en) * 2013-03-18 2013-06-12 施大钟 High-sodium coal sodium removal, quality improvement fan mill pulverization and water recovery combined cycle power generation system
CN103206717A (en) * 2013-04-24 2013-07-17 黑龙江省华能电力技术有限公司 Intermediate-speed powder milling system capable of drying lignite by using cold and hot smoke
CN104930535A (en) * 2015-06-12 2015-09-23 北京国电龙源环保工程有限公司 Integrated direct-fired pulverizing system with coal drying and water recovery functions
CN104964302A (en) * 2015-06-12 2015-10-07 北京国电龙源环保工程有限公司 Direct-blowing pulverizing system with coal drying function and water recycling function
CN107314391A (en) * 2017-06-16 2017-11-03 孙五 A kind of technology that boiler Winter protection is carried out using seal fan system
CN109351105A (en) * 2018-11-19 2019-02-19 刘燕红 A kind of coal-fired flue-gas processing equipment
CN112082149A (en) * 2020-09-08 2020-12-15 东方电气集团东方锅炉股份有限公司 Flue gas recirculation lignite drying method and drying system
CN113776075A (en) * 2021-08-30 2021-12-10 西安交通大学 Walnut shell raw coal blending combustion pulverizing system

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103148495A (en) * 2013-03-18 2013-06-12 施大钟 High-sodium coal sodium removal, quality improvement fan mill pulverization and water recovery combined cycle power generation system
CN103148495B (en) * 2013-03-18 2016-01-13 上海机易电站设备有限公司 High sodium coal takes off sodium upgrading fan mill powder process and Water Sproading association circulating power generation system
CN103206717A (en) * 2013-04-24 2013-07-17 黑龙江省华能电力技术有限公司 Intermediate-speed powder milling system capable of drying lignite by using cold and hot smoke
CN103206717B (en) * 2013-04-24 2015-09-09 黑龙江省华能电力技术有限公司 Cold and hot flue gas drying brown coal medium-speed milling pulverization system
CN104930535A (en) * 2015-06-12 2015-09-23 北京国电龙源环保工程有限公司 Integrated direct-fired pulverizing system with coal drying and water recovery functions
CN104964302A (en) * 2015-06-12 2015-10-07 北京国电龙源环保工程有限公司 Direct-blowing pulverizing system with coal drying function and water recycling function
CN107314391A (en) * 2017-06-16 2017-11-03 孙五 A kind of technology that boiler Winter protection is carried out using seal fan system
CN109351105A (en) * 2018-11-19 2019-02-19 刘燕红 A kind of coal-fired flue-gas processing equipment
CN112082149A (en) * 2020-09-08 2020-12-15 东方电气集团东方锅炉股份有限公司 Flue gas recirculation lignite drying method and drying system
CN113776075A (en) * 2021-08-30 2021-12-10 西安交通大学 Walnut shell raw coal blending combustion pulverizing system

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