CN1191287A - Layer suspension mixed burning method and device for boiler - Google Patents
Layer suspension mixed burning method and device for boiler Download PDFInfo
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- CN1191287A CN1191287A CN97101763A CN97101763A CN1191287A CN 1191287 A CN1191287 A CN 1191287A CN 97101763 A CN97101763 A CN 97101763A CN 97101763 A CN97101763 A CN 97101763A CN 1191287 A CN1191287 A CN 1191287A
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- coal
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- sorter
- boiler
- suspension mixed
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- 239000000725 suspension Substances 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 9
- 239000003245 coal Substances 0.000 claims abstract description 120
- 238000010304 firing Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 3
- 230000010358 mechanical oscillation Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 15
- 238000009423 ventilation Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000007921 spray Substances 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract 1
- 241000273930 Brevoortia tyrannus Species 0.000 description 8
- 239000002817 coal dust Substances 0.000 description 7
- 239000000428 dust Substances 0.000 description 7
- 239000010881 fly ash Substances 0.000 description 7
- 239000003517 fume Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000009841 combustion method Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 239000003500 flue dust Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000000391 smoking effect Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
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- Combustion Of Fluid Fuel (AREA)
Abstract
A grate firing and suspension mixed combustion unit for boiler is composed of coal bay, combusition box, grate and blower, and features that coal feed valve and coarse and fine coal separator are arranged between coal bay and combustion box, the fine coal drying tube at one side of said saparator is connected to coal grinder connected to spray burner of coal powder, and the another side of separator is connected to grate. Its advantages are improved ventilation condition, high combustion efficiency and less environmental pollution.
Description
The present invention relates to a kind of boiler mixed combusting technology, especially in a kind of boiler grate firing and coal dust suspension mixed burning method and device thereof.
Advantages such as chain stoker boiler and chain furnace are strong owing to having load variations adaptability, and coal accommodation is wider, and is reliable obtain very using widely in medium small boiler.At present in the small power plant of China 35 tons/time and 65 tons/time chain stoker boiler and chain furnace occupy suitable ratio.In recent years, the use of chain stoker boiler has obvious ascendant trend.But this class boiler ubiquity efficiency of combustion is low, flying dust and ash combustibles content height, the defective that original discharge concentration is big.Under the excessive situation of combustion requirements, fine-dusty coal ratio that existing market provides the granularity of the marketable coal that boiler uses far not meet this class boiler, it is more outstanding that this defective just becomes.Especially chain stoker boiler, after the wind-powered machine spreader feeder is thrown into burner hearth with coal, tiny fuel particle is suspension combustion, the untenable bulky grain of air-flow falls on fire grate to burn, the particle that is suspension combustion in a large number will burn in burner hearth, its granularity is thin inadequately, make chain stoker boiler ubiquity flying dust amount big, the problem that unburned combustible in fly ash is high, unburned combustible in fly ash is generally more than 55%, the imperfect combustion loss of machinery is very big, and this is to use chain stoker boiler unit to press for the difficult problem of solution.For chain furnace, too much duff has worsened the furnace grate ventilation condition, and efficiency of combustion is descended.
State problem for solving art, the boiler maker that has has at present designed the fly-ash reburning device in chain stoker boiler, send resume combustion behind the burner hearth after flying dust is collected again back to, but operating position and unsatisfactory, because the repeatedly loopback of flying dust circulation makes the wearing and tearing of heating surface increase considerably.Patent announcement CN2076193U has proposed the high temperature fly ash loopback device, and this device can improve the wearing and tearing of heating surface., though fly-ash reburning can reduce some unburned carbon in flue dust, can not drop to lower degree.Patent announcement CN2171780Y proposes layering coal supply apparatus, and patent announcement CN2123684U proposes to adopt coal yard separates coal with the vibratory sieve thickness after with patent announcement CN1070464A, enters combustion method and burner thereof in the stove respectively.Though these burners can improve the ventilation condition of fire grate, the former only is suitable for positive converter row chain furnace, and chain stoker boiler can't be suitable for, and flying dust amount and unburned carbon in flue dust is reduced, and slightly increase; The latter increases considerably flying dust amount, unburned carbon in flue dust, in fact the purpose of this device realization is that existing chain stoker boiler just forms in combustion process naturally, and this combustion system that chain stoker boiler forms is to cause flying dust amount and the high root place of unburned combustible in fly ash.
The objective of the invention is at the deficiencies in the prior art and defective, a kind of grate firing of stokehold raw coal coarse and fine separation and the method and burner thereof of coal dust suspended mixture combination burning of having is provided.This combustion method and burner thereof are applicable to chain stoker boiler or chain furnace.
The objective of the invention is to take following measure to realize: this boiler layer suspension mixed burning device comprises coal bunker, burner hearth, fire grate, blower fan, it is characterized in that establishing between coal bunker and burner hearth coal supply valve and thickness coal sorter, a side of thickness coal sorter is connected with fire grate; The opposite side of thickness coal sorter is established dry duff pipe, and dry duff pipe links to each other with coal pulverizer, and coal pulverizer links to each other with coal burner.Establish the rough coal coal feeder between thickness coal sorter and fire grate.Thickness coal coal feeder is a spreader feeder, also can be made up of coal bunker and coal gate.
Raw coal separation can adopt pneumatic separation or mechanical oscillation sorting, is good with pneumatic separation.When adopting pneumatic separation, thickness coal sorter pneumatic separation device is established the sorting nozzle on the pneumatic separation device.Coal burner adopts boiler both walls or front-back wall arrangement.
A kind of boiler layer suspension mixed burning method is characterized in that:
A. raw coal adds the coal supply valve by coal bunker with coal, and the rotation of driven by motor coal supply valve is sent raw coal into thickness coal sorter;
B. establish the sorting nozzle that links to each other with hot bellows, overfire air fan on the thickness coal sorter, raw coal carries out drying under the effect at hot blast in thickness coal sorter, carries out coarse and fine separation simultaneously;
C. thickness coal sorter is sent into the rough coal told on the fire grate in the burner hearth by the rough coal coal feeder, carries out grate firing; Send into burner after duff drying duff pipe is dry once more, coal pulverizer is levigate, torch burning suspends; Thereby realize the purpose of grate firing of the present invention and coal dust suspended mixture combination burning.
Described dry duff pipe links to each other with fume pipe, and duff is moved downward by gravity and suction function in dry duff pipe, and carries out redrying.
Fig. 1 is a kind of structural representation that is used for the chain stoker boiler of pneumatic separation for embodiment of the present invention
Fig. 2 is a process chart of the present invention
1. coal bunkers, 2. coal supply valves, 3. hot bellows, 4. sorting nozzles, 5. thickness coal sorters, 6. dry duff pipe 7. spreader feeders 8. burner hearths 9. fire grates 10. coal pulverizers 11. separators 12. coal pipes 13. overfire air fans 14. blower fans 15. burners 16. air preheaters 17. fume pipes 18. smoking mouths among the figure
Below in conjunction with accompanying drawing the embodiment of the invention is specified:
Illustrated embodiment with reference to the accompanying drawings, boiler layer suspension mixed burning device mainly comprises compositions such as coal bunker 1, coal supply valve 2, thickness coal sorter 5, spreader feeder 7, burner hearth 8, fire grate 9, coal pulverizer 10, blower fan 14.Establish coal supply valve 2 below coal bunker 1, coal supply valve 2 adopts rotary structure, is provided with the blade of constant slope in the coal supply valve 2, and blade only is advisable with 6-10, guarantees raw coal is quantitatively sent into thickness coal sorter 5 continuously.Strength thickness coal sorter 5 is established in coal supply valve 2 belows, and this sorter 5 is provided with sorting nozzle 4.Be connected with hot bellows 3 on the sorting nozzle 4, hot bellows 3 links to each other with air preheater 16; One side of thickness coal sorter 5 is established dry duff pipe 6; The opposite side of thickness coal sorter 5 is established spreader feeder 7, and spreader feeder 7 is thrown into the rough coal that sub-elects on the fire grate 9 in the burner hearth 8 and carries out grate firing.The top of dry duff pipe 6 links to each other with the mouth 18 of smoking through fume pipe 17, and the bottom of dry duff pipe 6 links to each other with coal pulverizer 10.The duff that coal pulverizer 10 is worn into separates after coal pipe enters coal burner 15 through separator 11.
The combustion method of burner of the present invention: raw coal is sent in the thickness coal sorter 5 through quantitative coal supply valve 2 continuously and quantitatively by coal bunker 1.Rotation coal supply valve 2 can also can be established motor separately and drive with the motor-driven of former spreader feeder 7.Blower fan 14 is sent wind into air preheater 16, from air preheater 16 draw hot blast through overfire air fan 13 pressurization after, introduce hot bellows 3 and in sorting nozzle 4 sprays into thickness coal sorter 5.Raw coal carries out drying and coarse and fine separation under the effect of certain speed hot blast, bigger coal grain gravitate enters spreader feeder 7, and the rough coal grain is sent into grate firing on the fire grate 9 through spreader feeder 7; The duff grain enters in the dry duff pipe 6 under the negative pressure and gravity acting in conjunction of blower mill 10.The smoking port 18 of flue gas from the furnace wall is in fume pipe 17 enters dry duff pipe 6, duff is dry once more, dried duff is made coal dust in blower mill 10, coal dust meets the requirements of fineness and enters coal burner 15 torch burning that suspends again after separator 11 separates.
The present invention compared with prior art, its advantage is as follows: this kind of the present invention grate firing and suspended mixture combination burning Method is organized torch burning after the duff that originally being suspends burns is made coal dust, is suspended in the coal dust in the air-flow It is extremely fast that particle adds thermal velocity, and volatilization part and coke almost catch fire simultaneously, form heterogeneous combustion, make it very short Time in after-flame, make the unburned combustible in fly ash decrease; And the rough coal grain of removing duff is on fire grate Burning has improved ventilation condition, and the efficiency of combustion of boiler is increased substantially; Fall and lacked environmental pollution.
The thickness coal sorting of this burner is finished continuously with burning is disposable, and sorting adopts strength or machinery to shake Use force through the segmentation choosing, separation equipment is simple and reliable, and the moisture content strong adaptability to coal can not stop up; Suspending When combustion parts needs maintenance to stop using such as equipment etc., the boiler operation of still completely exerting oneself.
Claims (7)
1, a kind of boiler layer suspension mixed burning device, comprise coal bunker, burner hearth, fire grate, blower fan, it is characterized in that establishing coal supply valve and thickness coal sorter between coal bunker and burner hearth, thickness coal sorter one side is established dry duff pipe, dry duff pipe links to each other with coal pulverizer, and coal pulverizer links to each other with coal burner; The opposite side of thickness coal sorter is connected with fire grate.
2, boiler layer suspension mixed burning device according to claim 1 is characterized in that establishing between thickness coal sorter and fire grate the rough coal coal feeder.
3, boiler layer suspension mixed burning device according to claim 2 is characterized in that the rough coal coal feeder is spreader feeder or is made up of coal bunker and coal gate.
4, boiler layer suspension mixed burning device according to claim 1 is characterized in that the coal supply valve adopts rotary structure.
5, boiler layer suspension mixed burning device according to claim 1 is characterized in that coal burner adopts boiler both walls or front-back wall arrangement.
6, a kind of boiler layer suspension mixed burning method is characterized in that:
A. raw coal adds the coal supply valve by coal bunker with coal, and the rotation of driven by motor coal supply valve is sent raw coal into thickness coal sorter;
B. establish the sorting nozzle that links to each other with hot bellows, overfire air fan on the thickness coal sorter, raw coal carries out drying under the effect at hot blast in thickness coal sorter, carries out coarse and fine separation simultaneously;
C. thickness coal sorter is sent into the rough coal told on the fire grate in the burner hearth by the rough coal coal feeder, carries out grate firing; Duff drying duff pipe drying, send into burner after coal pulverizer is levigate, torch burning suspends;
7, boiler layer suspension mixed burning method according to claim 6 is characterized in that thickness coal sorting employing pneumatic separation or mechanical oscillation sorting, is good with pneumatic separation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97101763A CN1191287A (en) | 1997-02-19 | 1997-02-19 | Layer suspension mixed burning method and device for boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97101763A CN1191287A (en) | 1997-02-19 | 1997-02-19 | Layer suspension mixed burning method and device for boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1191287A true CN1191287A (en) | 1998-08-26 |
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ID=5165973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97101763A Pending CN1191287A (en) | 1997-02-19 | 1997-02-19 | Layer suspension mixed burning method and device for boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1191287A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563616A (en) * | 2011-01-04 | 2012-07-11 | 董彦东 | Combustion method for boiler |
| CN102901089A (en) * | 2012-09-20 | 2013-01-30 | 上海工业锅炉研究所 | Pulverized coal co-combustion system of industrial boiler |
| CN103471091A (en) * | 2013-09-22 | 2013-12-25 | 中国计量学院 | Composite chain furnace with pulverized coal burner |
-
1997
- 1997-02-19 CN CN97101763A patent/CN1191287A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563616A (en) * | 2011-01-04 | 2012-07-11 | 董彦东 | Combustion method for boiler |
| CN102901089A (en) * | 2012-09-20 | 2013-01-30 | 上海工业锅炉研究所 | Pulverized coal co-combustion system of industrial boiler |
| CN103471091A (en) * | 2013-09-22 | 2013-12-25 | 中国计量学院 | Composite chain furnace with pulverized coal burner |
| CN103471091B (en) * | 2013-09-22 | 2016-07-06 | 中国计量学院 | A kind of combined type chain furnace with coal burner |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| CB02 | Change of applicant information |
Applicant after: Pan Zengxiang Applicant before: Pan Zengxiang Applicant before: Yang Shuichun |
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| CB03 | Change of inventor or designer information |
Inventor after: Pan Zengxiang Inventor before: Pan Zengxiang Inventor before: Yang Shuichun |
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Free format text: CORRECT: INVENTOR; FROM: PAN ZENGXIANG; YANG SHUICHUN TO: PAN ZENGXIANG |
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