CN203116056U - Medium-speed mill direct blowing coal pulverizing generating system in smoke fluidizing of lignite - Google Patents
Medium-speed mill direct blowing coal pulverizing generating system in smoke fluidizing of lignite Download PDFInfo
- Publication number
- CN203116056U CN203116056U CN 201320121083 CN201320121083U CN203116056U CN 203116056 U CN203116056 U CN 203116056U CN 201320121083 CN201320121083 CN 201320121083 CN 201320121083 U CN201320121083 U CN 201320121083U CN 203116056 U CN203116056 U CN 203116056U
- Authority
- CN
- China
- Prior art keywords
- coal
- medium
- speed pulverizer
- speed mill
- lignite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Drying Of Solid Materials (AREA)
- Air Supply (AREA)
Abstract
A medium-speed mill direct blowing coal pulverizing generating system in smoke fluidizing of lignite comprises a medium speed mill, a pulverized coal distributor, an air blower, a sealed fan, an air preheater, a steam turbine generator unit and a fluidizing drying device. A powder outlet of the medium speed mill is connected with a combustor of a boiler through the pulverized coal distributor, the air blower is connected with the air preheater, the air preheater comprises two paths, one path is connected with the combustor, the other path is connected with an air inlet of the medium speed mill, the sealed fan is connected with a sealed tuyere of the medium speed mill, and the fluidizing drying device is connected with a smoke dust remover, an exhaust gas outlet of the steam turbine generator unit, a chimney and a coal inlet of the medium speed mill. The medium-speed mill direct blowing coal pulverizing generating system in smoke fluidizing of the lignite enables moisture in raw coal to be greatly reduced, capacity of a coal pulverizing system is greatly improved to enable high moisture lignite to adopt medium speed mill coal pulverizing which is safe and reliable to operate and low in maintenance cost, large ratio mixing combustion of the lignite or all lignite combustion in a coal-fired unit of the medium-speed mill direct blowing coal pulverizing generating system is adopted, and remarkable economical and energy saving effects are achieved.
Description
Technical field
The utility model relates to the coal fired power generation technical field, relates in particular to a kind of flue gas fluidisation brown coal medium-speed pulverizer blowing powder producing electricity generation 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 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 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 flue gas fluidisation brown coal medium-speed pulverizer blowing powder producing electricity generation system.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of flue gas fluidisation brown coal medium-speed pulverizer blowing powder producing electricity generation 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 smoke duster of described fluidized drying device and described boiler flue tail end, the weary gas outlet of 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, first air intake, second air intake, coal-in port and coal outlet, described gas outlet and coal-in port are positioned at the top of described fluid bed, described second air intake and coal outlet are positioned at the below of described fluid bed, described gas outlet is connected with described heat-exchanger rig through described sack cleaner, described heat-exchanger rig is connected with the chimney of described boiler, the weary gas outlet of described Turbo-generator Set is connected with described heating tube through described first air intake, described second air intake is connected with smoke duster, described coal outlet and sack cleaner all are connected with the coal feed point of described medium-speed pulverizer, 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 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 flue gas fluidisation brown coal medium-speed pulverizer blowing powder producing electricity generation 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 smoke duster 16 of boiler 15 flue tail ends, the weary gas outlet of Turbo-generator Set 13, the chimney 17 of boiler 15 and the coal feed point of medium-speed pulverizer 8.
Particularly, the fluidized drying device comprises drying tube 3, is located at described drying tube interior fluid bed 4 and heating tube 5, is located at drying tube outer 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 located at outside the drying tube 3.
Drying tube 3 is provided with gas outlet, first air intake, second air intake, coal-in port and coal outlet, and gas outlet and coal-in port are positioned at the top of fluid bed 4, and second air intake and coal outlet 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 heat-exchanger rig 7 through sack cleaner 6 and blower fan 18, heat-exchanger rig 7 is connected with the chimney 17 of boiler 15, the weary gas outlet of Turbo-generator Set 13 is connected with heating tube 5 through first air intake, second air intake is connected with smoke duster 16 through blower fan 19, and coal outlet and sack cleaner 6 all are connected with the coal feed point of medium-speed pulverizer 8.
The meal outlet of medium-speed pulverizer 8 is connected with the burner 20 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, and it is connected with air preheater 12.
Condensed-water recovering device 14 is connected with heating tube 5 and heat-exchanger rig 7, the low-temperature condensate that produces in heating tube 5 and the heat-exchanger rig 7 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 the high temperature of Turbo-generator Set 13, and the former brown coal in the heat drying pipe 3 carry out predrying.Weary air cooling in the heating tube 5 is coagulated the back and is reclaimed by condensed-water recovering device 14.
Simultaneously, high-temperature flue gas from the smoke duster 16 of boiler 15 flue tail ends enters in the drying tube 3, because the effect of blower fan 19, high-temperature flue gas at a high speed by fluid bed 4, makes the former brown coal generation fluidized drying on the fluid bed 4 from bottom to top, and simultaneously a part of former brown coal generation fluidisation is pulverized and formed coal dust, this is a precomminution step, at this moment, high-temperature flue gas has been taken away the moisture content in the former brown coal, forms steam.
Coal dust after the precomminution is brought sack cleaner 6 by steam into from the gas outlet of drying tube 3, sack cleaner 6 is separated the coal dust in the high-temperature flue gas, and send into medium-speed pulverizer 8, and, steam enters heat-exchanger rig 7 through blower fan 18, heat-exchanger rig 7 is separated into condensate water with the moisture content of steam, and remaining flue gas is discharged through chimney 14.
Simultaneously, the coal outlet of remaining former brown coal drying pipe enters medium-speed pulverizer 8 in the drying tube 3.
Brown coal grind in medium-speed pulverizer 8, wind powder mixture after grinding enters the mill separator 23 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 20 after pulverized coal distributor 9 distributes, and sprays into boiler 15 internal combustion by burner 20.
The air of being carried by pressure fan 9 is sent to medium-speed pulverizer 8 through air preheater 12 heating backs one tunnel as a wind, and another road is distributed through bellows 22 as secondary wind and is sent to each burner 20 participation 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 flue gas that the flue tail end produces is by smoke duster 16 dedustings, and the flue gas after the dedusting is through 24 fens two-way of blower fan, and a route chimney 17 discharges, and drying tube 3 is sent into through blower fan 16 in another road, is used for fluidized drying and pulverizing.
Be provided with the cooling water tube bank in the heat-exchanger rig 7, wherein the condensate water of Chan Shenging 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. flue gas fluidisation brown coal medium-speed pulverizer blowing powder producing electricity generation 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 smoke duster of described fluidized drying device and described boiler flue tail end, the weary gas outlet of described Turbo-generator Set, the chimney of described boiler and the coal feed point of medium-speed pulverizer connect.
2. a kind of flue gas fluidisation brown coal medium-speed pulverizer blowing powder producing electricity generation 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, first air intake, second air intake, coal-in port and coal outlet, described gas outlet and coal-in port are positioned at the top of described fluid bed, described second air intake and coal outlet are positioned at the below of described fluid bed, described gas outlet is connected with described heat-exchanger rig through described sack cleaner, described heat-exchanger rig is connected with the chimney of described boiler, the weary gas outlet of described Turbo-generator Set is connected with described heating tube through described first air intake, described second air intake is connected with smoke duster, described coal outlet and sack cleaner all are connected with the coal feed point of described medium-speed pulverizer, and described heating tube is positioned at the top of described fluid bed.
3. a kind of flue gas fluidisation brown coal medium-speed pulverizer blowing powder producing electricity generation system according to claim 1 and 2 is characterized in that also comprise condensed-water recovering device, described condensed-water recovering device is connected with heating tube and heat-exchanger rig.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320121083 CN203116056U (en) | 2013-03-18 | 2013-03-18 | Medium-speed mill direct blowing coal pulverizing generating system in smoke fluidizing of lignite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320121083 CN203116056U (en) | 2013-03-18 | 2013-03-18 | Medium-speed mill direct blowing coal pulverizing generating system in smoke fluidizing of lignite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203116056U true CN203116056U (en) | 2013-08-07 |
Family
ID=48896394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320121083 Expired - Fee Related CN203116056U (en) | 2013-03-18 | 2013-03-18 | Medium-speed mill direct blowing coal pulverizing generating system in smoke fluidizing of lignite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203116056U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925606A (en) * | 2014-04-04 | 2014-07-16 | 西安西热锅炉环保工程有限公司 | High-moisture lignite medium-speed coal mill pulverizing system heating primary air through coal gas burning |
| CN103925607A (en) * | 2014-04-16 | 2014-07-16 | 西安西热锅炉环保工程有限公司 | Positive-pressure direct-firing pulverizing system based on segmented temperature control and control method thereof |
| 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 |
-
2013
- 2013-03-18 CN CN 201320121083 patent/CN203116056U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925606A (en) * | 2014-04-04 | 2014-07-16 | 西安西热锅炉环保工程有限公司 | High-moisture lignite medium-speed coal mill pulverizing system heating primary air through coal gas burning |
| CN103925607A (en) * | 2014-04-16 | 2014-07-16 | 西安西热锅炉环保工程有限公司 | Positive-pressure direct-firing pulverizing system based on segmented temperature control and control method thereof |
| CN103925607B (en) * | 2014-04-16 | 2016-01-20 | 西安西热锅炉环保工程有限公司 | The pressurized direct pulverizing coal system controlled based on temperature section and control method thereof |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203147790U (en) | Exhaust air fluidized brown coal medium speed mill straight-blowing coal pulverizing system | |
| CN102840593B (en) | Fume dried lignite medium speed mill powder-making system | |
| CN102889609B (en) | Smoke drying steel ball brown-coal milling system | |
| CN102798132B (en) | Fan mill front counter flow type furnace-smoke drying dewatering direct blowing pulverization system | |
| CN102840595A (en) | Fume pre-dried lignite medium speed mill straight-blowing powder-making system | |
| CN202229208U (en) | Furnace smoke drying and water recycling warehouse-type fan mill hot air powder supplying and making system | |
| CN203963981U (en) | A kind of steam drying brown coal medium-speed milling pulverization system | |
| CN202132968U (en) | Smoke drying steel ball brown-coal milling system | |
| CN102798133A (en) | Fan grinding hot blast powder feeding and pulverizing system utilizing flue gas drying and water recycling | |
| CN204176665U (en) | The pulverized coal preparation system that medium-speed pulverizer and fan mill combine | |
| CN203147791U (en) | Direct-blowing type medium-speed mill pulverizing system for smoke fluidization lignite | |
| CN113154432A (en) | Biomass power generation system and method coupled with coal burner unit | |
| CN102840594B (en) | Fume dried lignite medium speed mill straight-blowing powder-making system | |
| CN202195493U (en) | Medium-speed milling pulverization system for flue gas-dried lignite | |
| CN102889606A (en) | Direct fired pulverizing system of smoke pre-drying lignite steel ball mill | |
| CN102889608A (en) | Direct fired pulverizing system of smoke pre-drying lignite fan mill | |
| CN202132964U (en) | Fan mill front counter flow type furnace-smoke drying dewatering direct blowing pulverizer system | |
| CN203116057U (en) | Gas-exhaust brown coal fluidifying medium-speed mill direct-blowing type powder manufacturing and heat energy water recovery power generation system | |
| CN202419628U (en) | 300MW mixed-burning high furnace gas boiler | |
| CN104266214A (en) | Fan mill opening type powder producing system super or supercritical tower type boiler combustion and heat exchange method | |
| CN102759118A (en) | Lignite drum smoke pre-drying power generation integrated system and process | |
| CN202032602U (en) | Lignite roller flue gas pre-drying power generation integrated system | |
| CN203116056U (en) | Medium-speed mill direct blowing coal pulverizing generating system in smoke fluidizing of lignite | |
| CN202195494U (en) | Brown coal intermediate-speed milling and direct blowing coal pulverizing system for smoke drying | |
| CN202195495U (en) | Medium-speed milling direct-blow pulverization system for flue gas pre-dried lignite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130807 |