CN108036605A - A kind of device and method using the double waste heat drying raw coal in power station - Google Patents
A kind of device and method using the double waste heat drying raw coal in power station Download PDFInfo
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- CN108036605A CN108036605A CN201711409078.9A CN201711409078A CN108036605A CN 108036605 A CN108036605 A CN 108036605A CN 201711409078 A CN201711409078 A CN 201711409078A CN 108036605 A CN108036605 A CN 108036605A
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- raw coal
- dry
- boiler
- slag
- rotating cylinder
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
- F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
- F26B11/0477—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum
- F26B11/0486—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum the elements being held stationary, e.g. internal scraper blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The present invention relates to a kind of device and method using the double waste heat drying raw coal in power station.Raw coal is the raw material that station boiler is used to produce electric energy, and initial raw coal water content is generally higher, particularly lignite, its moisture content directly enters the stability that extreme influence is burnt in stove burning, be dried and the station service power consumption rate that power station is significantly greatly increased is lost up to more than 30%.The present invention includes the dry deslagging residual heat collection system of boiler, fume afterheat ancillary drier system and swinging raw coal drying system；The dry deslagging residual heat collection system of boiler and fume afterheat ancillary drier system are connected with swinging raw coal drying system.The waste heat sensible heat of the invention for fully recycling the dry dreg removing system lime-ash of boiler and boiler tail flue gas, rotary drying is used for the raw coal of thermoelectricity production, the moisture content of as-fired coal is greatly reduced, reduce gasification latent heat loss of the raw coal during hearth combustion, reduce deslagging temperature and exhaust gas temperature at the same time, heat loss due to sensible heat in slag and heat loss due to exhaust gas are reduced, improves boiler efficiency.
Description
Technical field
The present invention relates to a kind of device and method using the double waste heat drying raw coal in power station, dry dreg removing system is mainly used in
The depth of station boiler waste heat recycles, and is suitable for the electric power station system that raw coal water content is high and exhaust gas temperature is higher.
Background technology
At present, the deslagging of domestic and international Large-scale fire-electricity unit uses mechanical residue extraction mechanism more.Mechanical residue extraction mechanism can be divided into
Two kinds of wet type slag extractor and dry-type slag extractor.Wherein, wet type dreg removing system can by the thermal loss of uncompleted burned carbon in slag in water,
Cause energy loss, reduce species activity in slag, and water consumption is higher etc..Dry Slag Removal System is the furnace bottom on cooling conveyer belt
Slag simultaneously continues to after-flame, and under conveyer belt and deslagging chain-drive section is equipped with blast pipe, using the air draught on the spot of negative pressure in stove, recycles slag
Heat, system is without cooling water, and the material such as calcium oxide in Dry Slag Removal System slag is not destroyed, slag for comprehensive utilization rate
It is high.But Dry Slag Removal System slag temperature after cooling still suffers from certain heat loss due to sensible heat in slag still more than 100 DEG C.
Among station boiler heat loss, another bigger loss is flue gas loss, it accounts for whole boiler hot
The 7% to 8% of loss.On the premise of back-end ductwork security is not influenced, exhaust gas temperature is reduced, is conducive to recycle heat loss, carries
High boiler efficiency.But under existing service condition, how higher discharge smoke temperature of power station boiler is, causes certain heat loss due to exhaust gas.
Raw coal is the raw material that station boiler is used to produce electric energy, and initial raw coal water content is generally higher, particularly lignite, its
Moisture content directly enters the stability that extreme influence is burnt in stove burning up to more than 30%, reduces calorific value, gasification latent heat loss compared with
It is more.However, extra raw coal, especially lignite, dry that the station service power consumption rate that power station is significantly greatly increased is lost, such as Application No.
The Chinese patent of CN201210215491.2.
The content of the invention
It is an object of the invention to overcome above-mentioned deficiency existing in the prior art, and provide a kind of design rational utilization
The device and method of the double waste heat drying raw coal in power station, this makes full use of boiler to do row using the device of the double waste heat drying raw coal in power station
Two kinds of waste heat sensible heats of slag system lime-ash and boiler tail flue gas, dry raw coal, reduces gasification of the raw coal during hearth combustion
Latent heat losses, while deslagging temperature and exhaust gas temperature are reduced, improve boiler efficiency.
Technical solution is used by the present invention solves the above problems：A kind of dress using the double waste heat drying raw coal in power station
Put, including the dry deslagging residual heat collection system of boiler, fume afterheat ancillary drier system and swinging raw coal drying system；The pot
The dry deslagging residual heat collection system of stove and fume afterheat ancillary drier system are connected with swinging raw coal drying system；Its feature exists
In：
The dry deslagging residual heat collection system of boiler includes boiler slag-cooling bucket, dry-type slag extractor, dry slag header and breeze fan；Institute
The top that boiler slag-cooling bucket is arranged on the feed inlet of dry-type slag extractor is stated, conveyer belt is provided with the dry-type slag extractor, it is described
Dry slag header is arranged on the lower section of the discharge port of dry-type slag extractor, and the breeze fan is arranged on the side of dry slag header, described
The air outlet of breeze fan is connected by pipeline with the air inlet of dry slag header；
The fume afterheat ancillary drier system includes boiler back end ductwork and air inducing wind turbine；The flue gas of the boiler back end ductwork
Outlet is connected by pipeline with the air-vent of air inducing wind turbine；
The swinging raw coal drying system includes rotating cylinder, raw coal entrance, hot-wind inlet, hot-blast outlet and raw coal outlet；
The rotating cylinder is tubular structure, and the rotating cylinder is in tilted layout, and one end of the rotating cylinder is higher than rotating cylinder
The other end, hot-blast outlet and the raw coal entrance are arranged on one end of the rotating cylinder, hot-wind inlet and the raw coal outlet
The other end of the rotating cylinder is arranged on, the air outlet and air inducing wind turbine that the hot-wind inlet passes through pipeline and dry slag header
Air outlet connects；The rotating cylinder is internally provided with shovelling plate device, and the outside of the rotating cylinder is provided with support roller.Structure letter
Single, design is reasonable.
Furthermore, the dry slag header is body structure.
Furthermore, the air inlet of the dry slag header is arranged on the lower part of dry slag header, and the dry slag header goes out
Air port is arranged on the top of dry slag header.Air inlet and air outlet are respectively on two opposite side panels, and cold wind is from lower part
Air inlet enters in dry slag header, more abundant with the Boiler Furnace bottom clinker heat exchange of heat, and is discharged from top air outlet.
Furthermore, the device using the double waste heat drying raw coal in power station further includes coal feeder, and the raw coal goes out
Mouth is connected with coal feeder.The higher raw coal of water content is exported from raw coal and arranged after drying in swinging raw coal drying system
Go out, into coal feeder.
A kind of method using the double waste heat drying raw coal in power station, it is characterised in that：The method uses profit as described above
It is as follows with the device of the double waste heat drying raw coal in power station, the method：
Boiler Furnace bottom clinker is entered in dry-type slag extractor by boiler slag-cooling bucket, and is delivered to dry-type slag extractor by conveyer belt
Discharge port, falls into dry slag header afterwards；Open breeze fan to be blowed, cold wind enters dry slag collection by the bottom of dry slag header
In case, and contacted with Boiler Furnace bottom clinker, the cold wind by heat exchange becomes hot wind, and is entered back by the air outlet of dry slag header
In rotatable raw coal drying system；
Meanwhile air inducing wind turbine is opened, the flue gas in boiler back end ductwork is introduced into swinging raw coal drying system；
In swinging raw coal drying system, raw coal is entered in rotating cylinder by raw coal entrance, starts driving device, rotating cylinder
Rotated under the drive of support roller；Raw coal is disperseed in rotating cylinder by shovelling plate device, and as rotating cylinder carries out
Movement；The flue gas discharged in the hot wind and fume afterheat ancillary drier system discharged in the dry deslagging residual heat collection system of boiler converges
And entered jointly by hot-wind inlet in rotating cylinder, and contact and be dried with raw coal, finally discharged from hot-blast outlet；After drying
Raw coal exported and discharge by raw coal, and enter coal feeder.It is easy to operate, hot wind and flue gas converge after by rotating cylinder bottom
Into, form reverse impact type with raw coal and contact, contact it is more abundant, the drying effect of raw coal is good, by dry raw coal
Stabilization is burnt after entering stove.
Furthermore, the support roller is driven by motor.Revolution is adjustable.
Compared with prior art, the present invention haing the following advantages and effect：
1. the present invention is dried raw coal using surplus heat of power plant, the moisture content of as-fired coal is greatly reduced, stablizes burning, reduces
Heat waste.
2. the waste heat of the dry raw coal of the present invention derives from two kinds of the dry deslagging of boiler and tail flue gas, low-quality heat is recycled,
Deslagging heat waste and exhaust gas heat loss are reduced at the same time, improve stove effect.
3. helicoid rotating cylinder structure is beneficial to the rapid draing of raw coal, heat and mass is efficient, and rotating cylinder turns
Speed is adjustable, and drying regime is controllable.
4. system structure is simple, simple, convenient, comprehensive utilization of energy rate is high.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the embodiment of the present invention.
Fig. 2 is the swinging raw coal drying system structure diagram of the embodiment of the present invention.
In figure：Boiler slag-cooling bucket 1, dry-type slag extractor 2, dry slag header 3, breeze fan 4, boiler back end ductwork 5, air inducing wind
Machine 6, rotating cylinder 7, raw coal entrance 8, hot-wind inlet 9, hot-blast outlet 10, raw coal outlet 11, support roller 12, coal feeder 13.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment, and following embodiments are to this hair
Bright explanation and the invention is not limited in following embodiments.
Embodiment.
Referring to Fig. 1 to Fig. 2, a kind of device using the double waste heat drying raw coal in power station, including the dry deslagging residual heat collection of boiler
System, fume afterheat ancillary drier system and swinging raw coal drying system；More than the dry deslagging residual heat collection system of boiler and flue gas
Heat assisted drying system is connected with swinging raw coal drying system.
The dry deslagging residual heat collection system of boiler includes boiler slag-cooling bucket 1, dry-type slag extractor 2, dry slag header 3 and breeze fan
4；Boiler slag-cooling bucket 1 is arranged on the top of the feed inlet of dry-type slag extractor 2, and conveyer belt, dry slag collection are provided with dry-type slag extractor 2
Case 3 is arranged on the lower section of the discharge port of dry-type slag extractor 2, and dry slag header 3 is body structure, and breeze fan 4 is arranged on dry slag collection
The side of case 3, the air outlet of breeze fan 4 are connected by pipeline with the air inlet of dry slag header 3, the air outlet of dry slag header 3
Connected by pipeline with swinging raw coal drying system；The air inlet of dry slag header 3 is arranged on the lower part of dry slag header 3, dry slag
The air outlet of header 3 is arranged on the top of dry slag header 3.
Fume afterheat ancillary drier system includes boiler back end ductwork 5 and air inducing wind turbine 6；The flue gas of boiler back end ductwork 5
Outlet is connected by pipeline with the air-vent of air inducing wind turbine 6.
Swinging raw coal drying system includes rotating cylinder 7, raw coal entrance 8, hot-wind inlet 9, hot-blast outlet 10 and raw coal
Outlet 11；Rotating cylinder 7 is tubular structure, and rotating cylinder 7 is in tilted layout, and one end of rotating cylinder 7 is another higher than rotating cylinder 7
One end, hot-blast outlet 10 and raw coal entrance 8 are arranged on one end of rotating cylinder 7, and hot-wind inlet 9 and raw coal outlet 11 are arranged on back
The other end of drum body 7, hot-wind inlet 9 are connected by pipeline with the air outlet of dry slag header 3 and the air outlet of air inducing wind turbine 6；
Rotating cylinder 7 is internally provided with shovelling plate device, and the outside of rotating cylinder 7 is provided with support roller 12.
In the present invention, coal feeder 13 can also be included, raw coal outlet 11 is connected with coal feeder 13.
A kind of method using the double waste heat drying raw coal in power station, uses the dress using the double waste heat drying raw coal in power station as above
Put, method is as follows：
Boiler Furnace bottom clinker is entered in dry-type slag extractor 2 by boiler slag-cooling bucket 1, and is delivered to dry-type slag extractor by conveyer belt
2 discharge port, falls into dry slag header 3 afterwards；Open breeze fan 4 to be blowed, cold wind is entered by the bottom of dry slag header 3
In dry slag header 3, and being contacted with Boiler Furnace bottom clinker, the cold wind by heat exchange becomes hot wind, and by the outlet air of dry slag header 3
Mouth enters in swinging raw coal drying system；
Meanwhile air inducing wind turbine 6 is opened, the flue gas in boiler back end ductwork 5 is introduced into swinging raw coal drying system；
In swinging raw coal drying system, raw coal is entered in rotating cylinder 7 by raw coal entrance 8, starts motor, motor band moving teeth
Wheel drives to support roller 12 and does work, and rotating cylinder 7 is rotated under the drive of support roller 12；Raw coal is in rotating cylinder 7 by copying
Plate device is disperseed, and as rotating cylinder 7 is moved；The hot wind and flue gas discharged in the dry deslagging residual heat collection system of boiler
The flue gas discharged in waste heat ancillary drier system converges and is entered jointly by hot-wind inlet 9 in rotating cylinder 7, and is contacted with raw coal
It is dried, is finally discharged from hot-blast outlet 10；Dried raw coal enters coal feeder 13 by 11 discharge of raw coal outlet.
The dry dreg removing system lime-ash of boiler and boiler tail are fully recycled using the device of the double waste heat drying raw coal in power station
The waste heat sensible heat of flue gas, rotary drying are used for the lignite of the raw coal of thermoelectricity production, particularly high-moisture, as-fired coal are greatly reduced
Moisture content, reduce gasification latent heat loss of the raw coal during hearth combustion, while reduce deslagging temperature and exhaust gas temperature, subtract
Few heat loss due to sensible heat in slag and heat loss due to exhaust gas, improve boiler efficiency, realize the recycling of low grade heat energy, energy synthesis profit
With rate height.
Although the present invention is disclosed as above with embodiment, it is not limited to protection scope of the present invention, any to be familiar with
The technical staff of this technology, changes and retouches what is made without departing from the spirit and scope of the invention, should all belong to this hair
Bright protection domain.
Claims (6)
1. a kind of device using the double waste heat drying raw coal in power station, including the dry deslagging residual heat collection system of boiler, fume afterheat are auxiliary
Help drying system and swinging raw coal drying system；The dry deslagging residual heat collection system of the boiler and the dry system of fume afterheat auxiliary
System is connected with swinging raw coal drying system；It is characterized in that：
The dry deslagging residual heat collection system of boiler includes boiler slag-cooling bucket, dry-type slag extractor, dry slag header and breeze fan；Institute
The top that boiler slag-cooling bucket is arranged on the feed inlet of dry-type slag extractor is stated, conveyer belt is provided with the dry-type slag extractor, it is described
Dry slag header is arranged on the lower section of the discharge port of dry-type slag extractor, and the breeze fan is arranged on the side of dry slag header, described
The air outlet of breeze fan is connected by pipeline with the air inlet of dry slag header；
The fume afterheat ancillary drier system includes boiler back end ductwork and air inducing wind turbine；The flue gas of the boiler back end ductwork
Outlet is connected by pipeline with the air-vent of air inducing wind turbine；
The swinging raw coal drying system includes rotating cylinder, raw coal entrance, hot-wind inlet, hot-blast outlet and raw coal outlet；
The rotating cylinder is tubular structure, and the rotating cylinder is in tilted layout, and one end of the rotating cylinder is higher than rotating cylinder
The other end, hot-blast outlet and the raw coal entrance are arranged on one end of the rotating cylinder, hot-wind inlet and the raw coal outlet
The other end of the rotating cylinder is arranged on, the air outlet and air inducing wind turbine that the hot-wind inlet passes through pipeline and dry slag header
Air outlet connects；The rotating cylinder is internally provided with shovelling plate device, and the outside of the rotating cylinder is provided with support roller.
2. the device according to claim 1 using the double waste heat drying raw coal in power station, it is characterised in that：The dry slag header
For body structure.
3. the device according to claim 1 using the double waste heat drying raw coal in power station, it is characterised in that：The dry slag header
Air inlet be arranged on the lower part of dry slag header, the air outlet of the dry slag header is arranged on the top of dry slag header.
4. the device according to claim 1 using the double waste heat drying raw coal in power station, it is characterised in that：It is described to utilize power station
The device of double waste heat drying raw coal further includes coal feeder, and the raw coal outlet is connected with coal feeder.
A kind of 5. method using the double waste heat drying raw coal in power station, it is characterised in that：The method uses claim 1-4 such as to appoint
The device using the double waste heat drying raw coal in power station described in one claim, the method are as follows：
Boiler Furnace bottom clinker is entered in dry-type slag extractor by boiler slag-cooling bucket, and is delivered to dry-type slag extractor by conveyer belt
Discharge port, falls into dry slag header afterwards；Open breeze fan to be blowed, cold wind enters dry slag collection by the bottom of dry slag header
In case, and contacted with Boiler Furnace bottom clinker, the cold wind by heat exchange becomes hot wind, and is entered back by the air outlet of dry slag header
In rotatable raw coal drying system；
Meanwhile air inducing wind turbine is opened, the flue gas in boiler back end ductwork is introduced into swinging raw coal drying system；
In swinging raw coal drying system, raw coal is entered in rotating cylinder by raw coal entrance, starts driving device, rotating cylinder
Rotated under the drive of support roller；Raw coal is disperseed in rotating cylinder by shovelling plate device, and as rotating cylinder carries out
Movement；The flue gas discharged in the hot wind and fume afterheat ancillary drier system discharged in the dry deslagging residual heat collection system of boiler converges
And entered jointly by hot-wind inlet in rotating cylinder, and contact and be dried with raw coal, finally discharged from hot-blast outlet；After drying
Raw coal by raw coal export discharge.
6. the method according to claim 5 using the double waste heat drying raw coal in power station, it is characterised in that：The support roller is by electricity
Machine drives.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711409078.9A CN108036605A (en) | 2017-12-22 | 2017-12-22 | A kind of device and method using the double waste heat drying raw coal in power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711409078.9A CN108036605A (en) | 2017-12-22 | 2017-12-22 | A kind of device and method using the double waste heat drying raw coal in power station |
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| Publication Number | Publication Date |
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| CN108036605A true CN108036605A (en) | 2018-05-15 |
Family
ID=62100889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711409078.9A Pending CN108036605A (en) | 2017-12-22 | 2017-12-22 | A kind of device and method using the double waste heat drying raw coal in power station |
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| CN (1) | CN108036605A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109237468A (en) * | 2018-08-15 | 2019-01-18 | 中国能源建设集团广东省电力设计研究院有限公司 | Slag heat recovery system and its control method for circulating fluidized bed boiler |
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| CN207945929U (en) * | 2017-12-22 | 2018-10-09 | 华电电力科学研究院 | A kind of device for drying raw coal using the double waste heats in power station |
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2017
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| CN101210678A (en) * | 2006-12-25 | 2008-07-02 | 上海环保工程成套有限公司 | Sludge desiccation burning integral treatment method and device |
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| CN104534850A (en) * | 2014-12-15 | 2015-04-22 | 华北电力大学 | Raw coal low-temperature pre-drying system and method using flue gas and waste steam waste heat |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109237468A (en) * | 2018-08-15 | 2019-01-18 | 中国能源建设集团广东省电力设计研究院有限公司 | Slag heat recovery system and its control method for circulating fluidized bed boiler |
| CN109237468B (en) * | 2018-08-15 | 2020-06-12 | 中国能源建设集团广东省电力设计研究院有限公司 | Slag heat recovery system for circulating fluidized bed boiler and control method thereof |
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