CN203147790U - Exhaust air fluidized brown coal medium speed mill straight-blowing coal pulverizing system - Google Patents

Exhaust air fluidized brown coal medium speed mill straight-blowing coal pulverizing system Download PDF

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Publication number
CN203147790U
CN203147790U CN 201320121906 CN201320121906U CN203147790U CN 203147790 U CN203147790 U CN 203147790U CN 201320121906 CN201320121906 CN 201320121906 CN 201320121906 U CN201320121906 U CN 201320121906U CN 203147790 U CN203147790 U CN 203147790U
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coal
air
medium
medium speed
speed pulverizer
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CN 201320121906
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Chinese (zh)
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施大钟
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施大钟
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Abstract

An exhaust air fluidized brown coal medium speed mill straight-blowing coal pulverizing system comprises a medium speed mill, a pulverized coal distributor, an air feeder, a sealing fan, an air preheater, a turbo generator set and a fluidized drying device. A pulverized coal outlet of the medium speed mill is connected with a combustor of a boiler through the pulverized coal distributor; the air feeder is connected with the air preheater; the air preheater is divided into two paths, one path of the air preheater is connected with the combustor, and the other path is connected with an air intake of the medium speed mill; the sealing fan is connected with a sealing air inlet of the medium speed mill; the fluidized drying device is connected with an exhaust air outlet of the turbo generator set, a chimney of the boiler and a coal inlet of the medium speed mill. According to the exhaust air fluidized brown coal medium speed mill straight-blowing coal pulverizing system, moisture of raw coal is greatly reduced, drying output of the coal pulverizing system is greatly increased, therefore, the exhaust air fluidized brown coal medium speed mill straight-blowing coal pulverizing system is safe and reliable in operation and low in maintenance cost and can pulverize high-moisture brown coal, blending combustion of brown coal at a large ratio or complete brown coal combustion in a fuel coal unit which adopts the straight-blowing medium speed mill coal pulverizing system can be achieved, and remarkable economic and energy-saving benefits are possessed.

Description

Weary air-flow brown coal medium-speed pulverizer unit pulverized-coal system
Technical field
The utility model relates to the coal fired power generation technical field, relates in particular to a kind of weary air-flow brown coal medium-speed pulverizer unit pulverized-coal system.
Background technology
Brown coal are the minimum pit coals of degree of coalification, and being peat deposition changes the initial stage product of organic-biological rock into by dehydration, compacting, because 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 characteristics such as volatile matter height (Vdaf>37%), moisture height (total moisture is about 30%, and free moisture surpasses 19% mostly), caloric value low (about 12.56MJ/kg), ash fusion point low (about 1150 ℃), abrasiveness low (HGI is 50-70) 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, also plays a role to reducing CO2, NOx discharging simultaneously.
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 to mix in all kinds of coal-fired units to burn cheap brown coal.Higher and inflammable and explosive because of brown coal moisture, so becoming, the 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 station boiler powder process electricity generation 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 mainly contains low speed coal mill, medium-speed pulverizer and blower mill three major types at present.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 is fired low moisture brown coal unit and also adopted 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 is divided into direct-firing and direct-firing two classes of negative pressure of malleation.In the direct-firing system of negative pressure, dispose Powder discharging fan behind the coal pulverizer, coal pulverizer is worked under negative pressure state, be conducive to avoid 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 negative pressure is relatively more rare at present.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.According to the position difference of primary air fan, malleation is direct-firing can be divided into heat primary air machine system and cold primary air fan system again.
The direct-firing heat primary air mechanism of existing medium-speed pulverizer malleation powder system, this system adopts 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 confirm, adopt 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 are subjected to the restriction of air preheater and medium-speed pulverizer safe operation.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
Based on this, at above-mentioned technical problem, provide a kind of weary air-flow brown coal medium-speed pulverizer unit pulverized-coal system.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of weary air-flow brown coal medium-speed pulverizer unit pulverized-coal system, comprise medium-speed pulverizer, pulverized coal distributor, pressure fan, seal fan, the Turbo-generator Set of being located at the air preheater in the boiler flue and being connected with described boiler, the meal outlet of described medium-speed pulverizer is connected with the burner of described boiler through described pulverized coal distributor, described pressure fan connects described air preheater, described air preheater divides two-way, one the tunnel connects described burner, another road connects the air inlet of described medium-speed pulverizer, described seal fan connects the sealing air port of described medium-speed pulverizer, also comprise the fluidized drying device, the weary gas outlet of described fluidized drying device and described Turbo-generator Set, the chimney of described boiler and the coal feed point of medium-speed pulverizer connect.
Described fluidized drying device comprises drying tube, be located at fluid bed and heating tube in the described drying tube, be located at drying tube outer sack cleaner and heat-exchanger rig, described drying tube is provided with the gas outlet, coal-in port, coal outlet, first air intake and second air intake, described gas outlet and coal-in port are positioned at the top of described fluid bed, described coal outlet and second air intake are positioned at the below of described fluid bed, described gas outlet is connected with described sack cleaner, the air outlet of described sack cleaner divides two-way, one the tunnel is connected with second air intake of described drying tube through a blower fan, another road is connected with described heat-exchanger rig, described heat-exchanger rig is connected with the chimney of described boiler, the coal outlet of described drying tube and the coal outlet of sack cleaner all are connected with the coal feed point of described medium-speed pulverizer, the weary gas outlet of described Turbo-generator Set is connected with described heating tube through first air intake of described drying tube, and described heating tube is positioned at the top of described fluid bed.
This programme also comprises condensed-water recovering device, and described condensed-water recovering device is connected with described heating tube and heat-exchanger rig.
The utility model carries out predrying and fluidized drying by the fluidized drying device to former brown coal, the former moisture content of coal that enters medium-speed pulverizer is significantly reduced, the pulverized coal preparation system drying is exerted oneself and is significantly improved, make the high-moisture brown coal can adopt medium-speed pulverizer pulverized coal preparation system safe and reliable to operation, that maintenance cost is low, realized that vast scale is mixed burning brown coal or clean burn brown coal in the coal-fired unit that adopts direct-firing medium-speed pulverizer pulverized coal preparation system, had remarkable economical and energy-saving benefit; Simultaneously, heat energy and condensate water recycle and reuse to producing in the power generation process have reduced system cost.
Description of drawings
Be elaborated below in conjunction with the drawings and specific embodiments the utility model:
Fig. 1 is structural representation of the present utility model.
The specific embodiment
As shown in Figure 1, a kind of weary air-flow brown coal medium-speed pulverizer unit pulverized-coal system comprises run coal bin 1, weighing coal feeder 2, fluidized drying device, medium-speed pulverizer 8, pulverized coal distributor 9, pressure fan 10, seal fan 11, air preheater 12, Turbo-generator Set 13 and condensed-water recovering device 14.
The fluidized drying device is connected with the weary gas outlet of Turbo-generator Set 13, the chimney 16 of boiler 15 and the coal feed point of medium-speed pulverizer 8.
Particularly, the fluidized drying device is made of drying tube 3, fluid bed 4, heating tube 5, sack cleaner 6 and heat-exchanger rig 7.
Wherein, fluid bed 4 and heating tube 5 are located in the drying tube 3, and heating tube 5 is positioned at the top of fluid bed 4, and sack cleaner 6 and heat-exchanger rig 7 are positioned at outside the drying tube 3.
Drying tube 3 is provided with gas outlet, coal-in port, coal outlet, first air intake and second air intake, and gas outlet and coal-in port are positioned at the top of fluid bed 4, and coal outlet and second air intake are positioned at the below of fluid bed 4.
The coal outlet of run coal bin 1 bottom connects weighing coal feeder 2, weighing coal feeder 2 connects the coal-in port at drying tube 3 tops again, the gas outlet of drying tube 3 is connected with sack cleaner 6, the air outlet of sack cleaner 6 divides two-way, one the tunnel is connected with second air intake of drying tube 3 through blower fan 17, another road is connected with heat-exchanger rig 7, heat-exchanger rig is connected with the chimney 16 of boiler 15, the coal outlet of drying tube 3 and the coal outlet of sack cleaner all are connected with the coal feed point of medium-speed pulverizer 8, and first air intake of the weary gas outlet drying pipe 3 of Turbo-generator Set 13 is connected with heating tube 5.
The meal outlet of medium-speed pulverizer 8 is connected with the burner 18 of boiler 15 through pulverized coal distributor 9.
Pressure fan 10 connects air preheater 12, and air preheater 12 is arranged in the flue of boiler 15, and pressure fan 10 is positioned at outside the flue.
Air preheater 12 is divided into two-way by pipeline and blower fan 19, and one the tunnel through bellows 20 connection burners 18, and another road connects the air inlet of medium-speed pulverizer 8.Seal fan 11 is connected the sealing air port of medium-speed pulverizer 8.
Condensed-water recovering device 14 is connected with heating tube 5 and heat-exchanger rig 7, reclaims the low-temperature condensate that flows out in heating tube 5 and the heat-exchanger rig 7, condensate water can water treatment after by power plant's reuse.
Former brown coal are sent into drying tube 3 from run coal bin 1 through weighing coal feeder 2, and place on the fluid bed 4, enter in the heating tube 5 in the drying tube 3 from the weary gas of high temperature of Turbo-generator Set 13 simultaneously, former brown coal in the heat drying pipe 3, carry out predrying, make a part of moisture content generating gasification in the former brown coal, form steam, steam enters bag-type dust 6 through the gas outlet, bag-type dust 6 divides two-way through blower fan 21 with steam, and one road steam is sent into second air intake of drying tube 3 at a high speed by blower fan 17, and another road enters heat-exchanger rig 7, heat-exchanger rig 7 is separated into condensate water with the moisture content in the steam, and remaining dry gas is by chimney 16 dischargings.
Above-mentioned steam at a high speed by fluid bed 4, makes the former brown coal on the fluid bed 4 that fluidized drying further take place from bottom to top, and simultaneously a part of former brown coal generation fluidisation is pulverized and formed coal dust, and this is a precomminution step.
Coal dust after the precomminution is brought sack cleaner 6 by steam into from the gas outlet of drying tube 3, and sack cleaner 6 is separated the coal dust in the steam, and sends into medium-speed pulverizer 8, simultaneously, a steam part sends back to drying tube 3 again, and another part is discharged from chimney 16, so circulation.
In addition, the coal outlet of the former brown coal drying pipe of not taken away by steam in the drying tube 3 enters medium-speed pulverizer 8.
Brown coal grind in medium-speed pulverizer 8, wind powder mixture after grinding enters the mill separator 22 of medium-speed pulverizer 8, isolated meal returns medium-speed pulverizer 8 to be continued to grind, qualified wind powder mixture is sent to each burner 18 after pulverized coal distributor 9 distributes, and sprays into boiler 15 internal combustion by burner 18.
The air of being carried by pressure fan 10 is sent to medium-speed pulverizer 8 by blower fan 19 one tunnel as a wind through air preheater 12 heating, and another road is sent to each burner 18 as secondary wind through bellows 20 distribution and is participated in stove internal combustion.Seal fan 11 provides high pressure cold wind to be used for the sealing of equipment such as medium-speed pulverizer 8, feeder 2.
The waste gas that the flue tail end produces is sent into chimney 16 by smoke duster 23 and blower fan 24.
Be provided with the cooling water tube bank in the heat-exchanger rig 7, the condensate water that produces in heat-exchanger rig 7 and the heating tube 5 is reclaimed by condensed-water recovering device 14.
But, those of ordinary skill in the art will be appreciated that, above embodiment illustrates the utility model, and be not to be used as restriction of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of the above embodiment.

Claims (3)

1. weary air-flow brown coal medium-speed pulverizer unit pulverized-coal system, comprise medium-speed pulverizer, pulverized coal distributor, pressure fan, seal fan, the Turbo-generator Set of being located at the air preheater in the boiler flue and being connected with described boiler, the meal outlet of described medium-speed pulverizer is connected with the burner of described boiler through described pulverized coal distributor, described pressure fan connects described air preheater, described air preheater divides two-way, one the tunnel connects described burner, another road connects the air inlet of described medium-speed pulverizer, described seal fan connects the sealing air port of described medium-speed pulverizer, it is characterized in that, also comprise the fluidized drying device, the weary gas outlet of described fluidized drying device and described Turbo-generator Set, the chimney of described boiler and the coal feed point of medium-speed pulverizer connect.
2. a kind of weary air-flow brown coal medium-speed pulverizer unit pulverized-coal system according to claim 1, it is characterized in that, described fluidized drying device comprises drying tube, be located at fluid bed and heating tube in the described drying tube, be located at drying tube outer sack cleaner and heat-exchanger rig, described drying tube is provided with the gas outlet, coal-in port, coal outlet, first air intake and second air intake, described gas outlet and coal-in port are positioned at the top of described fluid bed, described coal outlet and second air intake are positioned at the below of described fluid bed, described gas outlet is connected with described sack cleaner, the air outlet of described sack cleaner divides two-way, one the tunnel is connected with second air intake of described drying tube through a blower fan, another road is connected with described heat-exchanger rig, described heat-exchanger rig is connected with the chimney of described boiler, the coal outlet of described drying tube and the coal outlet of sack cleaner all are connected with the coal feed point of described medium-speed pulverizer, the weary gas outlet of described Turbo-generator Set is connected with described heating tube through first air intake of described drying tube, and described heating tube is positioned at the top of described fluid bed.
3. a kind of weary air-flow brown coal medium-speed pulverizer unit pulverized-coal system according to claim 2 is characterized in that also comprise condensed-water recovering device, described condensed-water recovering device is connected with described heating tube and heat-exchanger rig.
CN 201320121906 2013-03-18 2013-03-18 Exhaust air fluidized brown coal medium speed mill straight-blowing coal pulverizing system CN203147790U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104132361A (en) * 2014-07-31 2014-11-05 上海理工大学 Open powder making steam warm air type boiler unit and power generation system thereof
CN104315509A (en) * 2014-11-13 2015-01-28 上海理工大学 Superheat steam drying powder production type coal burning boiler unit
CN104329668A (en) * 2014-11-13 2015-02-04 上海理工大学 Coal-fired power generation system capable of drying superheated steam into powder
CN104329666A (en) * 2014-11-13 2015-02-04 上海理工大学 Coal-fired power generation system capable of drying superheated steam into powder
CN104359120A (en) * 2014-11-13 2015-02-18 上海理工大学 Superheated steam drying pulverizing-type coal-fired power generation system
CN104373950A (en) * 2014-11-13 2015-02-25 上海理工大学 Superheated steam drying powder making type coal-fired power generation 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

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104132361A (en) * 2014-07-31 2014-11-05 上海理工大学 Open powder making steam warm air type boiler unit and power generation system thereof
CN104315509A (en) * 2014-11-13 2015-01-28 上海理工大学 Superheat steam drying powder production type coal burning boiler unit
CN104329668A (en) * 2014-11-13 2015-02-04 上海理工大学 Coal-fired power generation system capable of drying superheated steam into powder
CN104329666A (en) * 2014-11-13 2015-02-04 上海理工大学 Coal-fired power generation system capable of drying superheated steam into powder
CN104359120A (en) * 2014-11-13 2015-02-18 上海理工大学 Superheated steam drying pulverizing-type coal-fired power generation system
CN104373950A (en) * 2014-11-13 2015-02-25 上海理工大学 Superheated steam drying powder making type coal-fired power generation system
CN104329668B (en) * 2014-11-13 2016-07-20 上海理工大学 Superheat steam drying powder process type coal generating system
CN104315509B (en) * 2014-11-13 2016-08-17 上海理工大学 Superheat steam drying powder process type coal-burning boiler unit
CN104373950B (en) * 2014-11-13 2016-09-14 上海理工大学 Superheat steam drying powder process type coal generating 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

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