CN108592015A - A kind of boiler smoke recirculating system and its method - Google Patents
A kind of boiler smoke recirculating system and its method Download PDFInfo
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- CN108592015A CN108592015A CN201810623758.9A CN201810623758A CN108592015A CN 108592015 A CN108592015 A CN 108592015A CN 201810623758 A CN201810623758 A CN 201810623758A CN 108592015 A CN108592015 A CN 108592015A
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- jet pipe
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- air hose
- valve
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- 239000000779 smoke Substances 0.000 title claims abstract description 23
- 230000003134 recirculating effect Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000003546 flue gas Substances 0.000 claims abstract description 50
- 239000007789 gas Substances 0.000 claims abstract description 29
- 230000000977 initiatory effect Effects 0.000 claims abstract description 4
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 210000000038 chest Anatomy 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 235000019504 cigarettes Nutrition 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 3
- 239000003517 fume Substances 0.000 claims description 3
- 238000011109 contamination Methods 0.000 abstract description 5
- 239000000446 fuel Substances 0.000 abstract description 5
- 229910052728 basic metal Inorganic materials 0.000 abstract description 4
- 150000003818 basic metals Chemical class 0.000 abstract description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 21
- 230000008859 change Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
A kind of boiler smoke recirculating system, including wind turbine, blast main, sub- air hose and jet pipe group etc..Wind turbine is arranged on blast main, and blast main initiating terminal is connected with house outlet；Blast main end is located at boiler furnace lower outside, and sub- air hose is connected to blast main end；Jet pipe group is connected to sub- air hose end；Jet pipe group includes upper jet pipe and lower jet pipe, and the top OFA air outlets in boiler furnace are arranged in upper jet pipe opening；The primary air nozzle in boiler furnace is arranged in lower jet pipe opening.For flue gas recycled by total wind valve regulating flow, it is 10~30% to make its recirculation rate, and flue gas recycled enters the exhaust gas volumn ratio 2 of burner hearth by upper air-valve and/or adjusting distribution by upper jet pipe and by lower jet pipe:8~8:2.The present invention effectively adjusts burner hearth flame temperature and furnace exit temperature, operation is flexibly, simply by flue gas flow proportion adjustment above and below the adjusting of flue gas recirculation rate and burner hearth；And discharged nitrous oxides are reduced, improve the contamination for using high basic metal fuel.
Description
Technical field
The present invention relates to a kind of boiler smoke recirculating system and its methods, belong to combustion technology technical field.
Background technology
The concentration of nitrogen oxides and the generation correlation for the PM2.5 for causing haze are extremely strong, and Coal-fired Power Plants In China is largely complete
At minimum discharge transformation, i.e., the nitrogen oxides (NO in boiler smokex) concentration be less than 50mg/Nm3, but with national environmental protection power
It is larger to further decrease nitrous oxides concentration difficulty in boiler smoke for the reinforcement of degree.Mistake of the boiler in burning high basic metal fuel
Occur serious contamination problems in journey, boiler operatiopn cost can be significantly increased in current contamination prevention and control measure.
Largely practice have shown that, reducing boiler flame temperature helps to reduce nitrogen oxides (NOx) generation, and reduce burner hearth
Outlet temperature can be effectively improved use high basic metal coal caused by roof of the furnace convection heating surface contamination problems.Therefore,
There is an urgent need for a kind of methods that can effectively adjust burner hearth flame temperature and furnace outlet section temperature.
Invention content
The present invention is intended to provide one kind being capable of flexible modulation flue gas recirculation ratio boiler smoke recirculating system and its side
Method.
Technical scheme is as follows：
A kind of boiler smoke recirculating system, the system can be used in boiler dust remover exiting flue gas being transmitted back to boiler
Burner hearth, the upper furnace most end level-one burnout degree mouth are OFA (over fire air) air outlet, the lower furnace portion setting
Once air port, it is characterised in that：The system comprises wind turbine, blast main, sub- air hose and jet pipe groups；The wind turbine is arranged in institute
It states on blast main, the blast main initiating terminal is connected with the house outlet；The blast main end is located at the Boiler Furnace
Thorax lower outside, the sub- air hose are connected to the blast main end；The jet pipe group is connected to the sub- air hose end；It is described
Jet pipe group includes upper jet pipe and lower jet pipe, and the top OFA air outlets in the boiler furnace are arranged in the upper jet pipe opening；It is described
The primary air nozzle in the boiler furnace is arranged in lower jet pipe opening.
In above-mentioned technical proposal, total air-valve is provided on the blast main, for adjusting through the blast main loopback
Amount of flue gas emission；It is provided with sub- air-valve on the sub- air hose, for adjusting the flue gas flow by the sub- air hose；The jet pipe group
Upper jet pipe on be provided with upper air-valve and/or lower air-valve, the stove is sprayed by the upper jet pipe and/or lower jet pipe for adjusting
The exhaust gas volumn of thorax.
In above-mentioned technical proposal, the sub- air hose include the first sub- air hose and the second sub- air hose, the first sub- air hose and
Second sub- air hose is symmetricly set on the blast main end.
In above-mentioned technical proposal, the first sub- air hose and the second sub- air hose are in horizontally disposed, the center line of wall after boiler
Outside each extends on the outside of boiler both walls.
In above-mentioned technical proposal, the jet pipe group and the sub- air hose are correspondingly arranged, and the jet pipe group includes and described
The the second jet pipe group the first connected jet pipe group of one sub- air hose and be connected with the described second sub- air hose；The first jet pipe group and institute
The second jet pipe group is stated to be symmetricly set on the outside of two opposite sides of the burner hearth.
In above-mentioned technical proposal, the sub- air-valve include the first sub- air-valve being arranged on the described first sub- air hose and/or
The second sub- air-valve being arranged on the described second sub- air hose.
In above-mentioned technical proposal, the upper air-valve and/or lower air-valve can be used in adjusting through upper jet pipe and lower jet pipe
Exhaust gas volumn ratio, and make by the exhaust gas volumn of upper jet pipe be 2 by the ratio between exhaust gas volumn of lower jet pipe:8~8:2.
A kind of boiler smoke method for recycling, the method includes：
By boiler combustion and purified partial fume, being extracted from house outlet by wind turbine becomes flue gas recycled；
So that flue gas recycled is sequentially entered connected blast main and sub- air hose, is then divided flue gas recycled by jet pipe group
It is fitted on jet pipe and lower jet pipe, sprays into OFA air outlets and primary air nozzle respectively, becomes top circulating flue gas and lower part cycle cigarette
Gas adjusts ignition temperature and oxygen content in burner hearth.
In above-mentioned technical proposal, for flue gas recycled by total wind valve regulating flow, it is 10~30% to make its recirculation rate, is made
Burner region burner hearth maximum temperature declines in 150 DEG C, to ensure that fuel stabilization fully burns, and NOxGeneration can reduce
25% or so.Recirculation rate is the ratio of flue gas recycled amount and total exhaust gas volumn.
In above-mentioned technical proposal, flue gas recycled is by upper air-valve and/or adjusts distribution by upper jet pipe and passes through lower spray
Pipe enters the exhaust gas volumn ratio 2 of burner hearth:8~8:2.
The present invention has the following advantages and the technique effect of high-lighting：1. the present invention by by low-temperature flue gas after deduster again
Cycle is sent into burner hearth, by flue gas flow proportion adjustment above and below the adjusting of flue gas recirculation rate and burner hearth, effectively adjusts burner hearth fire
Flame temperature and furnace exit temperature, operation is flexibly, simply；2. flue gas recycled oxygen content is less than 6%, by adjusting furnace flame
Temperature can effectively control nitrogen oxides (NOx) generate, reduce nitrogen oxides (NOx) discharge, it reduces environmental pollution；3. passing through adjusting
Fire box temperature and furnace exit temperature can be effectively improved the contamination of roof of the furnace convection heating surface when using fuel containing high basic metal
Problem increases boiler oil applicability.
Description of the drawings
Fig. 1 is boiler smoke recirculating system schematic diagram according to the present invention.
Fig. 2 is the A-A partial cutaway schematics of Fig. 1.
Fig. 3 is the B-B partial cutaway schematics of Fig. 1.
In figure：1-deduster；2-wind turbines；3-blast mains；4-sub- air hoses；The sub- air hoses of 4a-the first；4b-the second
Air hose；5-jet pipe groups；51-upper jet pipes；52-lower jet pipes；The lower jet pipes of 52a-the first；The lower jet pipes of 52b-the second；6-upper-
Air-valve；6a-the first upper air-valves；6b-the second upper air-valves；7-primary air nozzles；8-OFA air outlets；9-total air-valves；10- stoves
Thorax；11-pendant superheaters；12-sub- air-valves；The sub- air-valves of 12a-the first；The sub- air-valves of 12b-the second；13-lower air-valves；13a―
First lower air-valve；13b-the second lower air-valves.
Specific implementation mode
The specific implementation mode and the course of work of the present invention are further described below in conjunction with the accompanying drawings.
The orientation such as upper, lower, left, right, front and rear in present specification term be position relationship based on ... shown in the drawings and
It establishes.Attached drawing is different, then corresponding position relationship is also possible to change therewith, therefore cannot be interpreted as with this to protecting model
The restriction enclosed.
As shown in Figure 1, a kind of boiler smoke recirculating system, including wind turbine 2, blast main 3, sub- air hose 4 and jet pipe group 5
Deng.The system can be used in 1 exiting flue gas of boiler dust remover being transmitted back to boiler furnace 10.10 top most end level-one after-flame of burner hearth
Air port is OFA air outlets 8, when most end level-one burnout degree is often referred to boiler furnace by multistage cloth wind, the burnout degree of burner hearth highest point
Or Secondary Air.10 lower part of burner hearth is provided with primary air nozzle 7.When boiler is coal-powder boiler, First air is fed by burner, and one
Secondary air port is located on burner.And when boiler is fluid bed or grate furnace, First air feeds burner hearth by an air compartment, accordingly
, primary air nozzle is located at an air compartment.
The direction of boiler of the present invention is defined according to the common understanding of those skilled in the art, i.e., as shown in Figure 1, close to tail
Portion's flue, deduster side be the rear side of boiler furnace, wall after the corresponding wing furnace bore wall face is known as；Wall is opposite after burner hearth
The other side is the front wall of boiler furnace, and the both sides of burner hearth longitudinal direction are the side wall of burner hearth.
3 initiating terminal of blast main is arranged on 1 exhaust pass of deduster, and wind turbine 2 is provided on blast main 3.3 end of blast main
Positioned at 10 lower outside of boiler furnace, it is usually located at the outer lower portion of wall after burner hearth 10.Sub- air hose 4 is connected to 3 end of blast main,
Jet pipe group 5 is connected to 4 end of sub- air hose；Jet pipe group 5 includes upper jet pipe 51 and lower jet pipe 52, and the opening of upper jet pipe 51 is arranged in boiler
The top OFA air outlets 8 of burner hearth 10；The primary air nozzle 7 in boiler furnace 10 is arranged in the lower opening of jet pipe 52.
When the sub- air hose 4 of flue gas recirculation system and jet pipe group 5 are all only arranged one group, jet pipe group 5 can be arranged in stove
10 any surface of thorax is provided on the furnace wall of OFA air outlets 8 and primary air nozzle, and sub- air hose 4 is so that jet pipe group 5 is connected with blast main 3.
Total air-valve 9 is provided on blast main 3, for adjusting the amount of flue gas emission by 3 loopback of blast main.It can on sub- air hose 4
To be provided with sub- air-valve 12, be especially arranged multigroup sub- air hose 4 it is in parallel when, can be adjusted by the aperture of corresponding sub- air-valve come
The flue gas flow that control passes through the sub- air hose of any of which group.The upper jet pipe 51 of jet pipe group 5 and lower jet pipe 52 are usually connected in parallel
On sub- air hose 4 or upper jet pipe 51 is connected on lower jet pipe 52 and close to 4 side of sub- air hose.It is arranged on the upper jet pipe 51 of jet pipe group 5
There is upper air-valve 6, for adjusting the exhaust gas volumn by the penetrating burner hearth 10 of upper jet pipe 51, that is, realizes to upper jet pipe 51 and lower jet pipe 52
Exhaust gas volumn proportion adjustment.Alternatively, being provided with lower air-valve (13) on lower jet pipe (52), stove is entered by lower jet pipe (52) for adjusting
The exhaust gas volumn of thorax 10.Upper air-valve 6 and/or lower air-valve 13 can be used in adjusting the exhaust gas volumn ratio by upper jet pipe 51 and lower jet pipe 52
Example, and make by the exhaust gas volumn of upper jet pipe 51 be 2 by the ratio between exhaust gas volumn of lower jet pipe 52:8~8:2.
As shown in figure 3, when the sub- air hose 4 of flue gas recirculation system and jet pipe group 5 are arranged two groups, flue gas can be made more equal
Even returns to burner hearth 10. at this point, sub- air hose 4 includes the first sub- sub- air hose 4b of air hose 4a and second, the first sub- air hose 4a and second
Sub- air hose 4b is symmetricly set on 3 end of blast main.The first sub- sub- air hose 4b of air hose 4a and second are in horizontally disposed, the wall after boiler
It is each extended on the outside of center line on the outside of the center line of wall of boiler both sides.In order to adjust exhaust gas volumn, sub- air-valve 12 includes being arranged first
The first sub- air-valve 12a on sub- air hose 4a and/or the second sub- air-valve 12b being arranged on the second sub- air hose 4b.
As shown in Figures 2 and 3, jet pipe group 5 and sub- air hose 4 are correspondingly arranged, and jet pipe group 5 includes being connected with the first sub- air hose 4a
The first jet pipe group and the second jet pipe group for being connected with the second sub- air hose 4b.First jet pipe group includes jet pipe 51a and the on first
Jet pipe 52a once.Second jet pipe group includes jet pipe 51a and second time jet pipe 52a on second.First jet pipe group and the second jet pipe group
It is symmetricly set on the outside of two opposite sides of the burner hearth 10.Correspondingly, upper air-valve 6 also includes that jet pipe is arranged on first
The first upper air-valve 6a and the second upper air-valve 6b being arranged on second on jet pipe 51b on 51a, is respectively used to adjust by first
Jet pipe 51b sprays into the exhaust gas volumn on 10 top of burner hearth on upper jet pipe 51a and second.Alternatively, lower air-valve 13 is set on lower jet pipe 52,
The first lower air-valve 13a and the second lower air-valve 13b is respectively set on first time jet pipe 52a and second time jet pipe 52b, adjusts respectively
Section first time jet pipe 52a and second time jet pipe 52b is passed through the exhaust gas volumn of 10 lower part of burner hearth.
A kind of boiler smoke method for recycling includes：
By boiler combustion and purified partial fume, being extracted from the outlet of deduster 1 by wind turbine 2 becomes recycling cigarette
Gas；
So that flue gas recycled is sequentially entered connected blast main 3 and sub- air hose 4, cigarette then will be recycled by jet pipe group 5
Qi leel is fitted on jet pipe 51 and lower jet pipe 52, sprays into OFA air outlets 8 and primary air nozzle 7 respectively, becomes top circulating flue gas under
Portion's circulating flue gas adjusts ignition temperature and oxygen content in burner hearth 10.
By controlling the ratio of total amount of circulating gas and lower jet pipe and upper jet pipe exhaust gas volumn, furnace flame can be effectively adjusted
Temperature and furnace exit temperature.Flue gas recycled adjusts flow by total air-valve 9, and it is 10~30% to make its recirculation rate, makes combustion
Burner region burner hearth maximum temperature declines in 150 DEG C, to ensure that fuel stabilization fully burns, and NOxGeneration can reduce
25% or so.Recirculation rate is the ratio of flue gas recycled amount and total exhaust gas volumn.
Flue gas recycled adjusts distribution by upper jet pipe 51 by upper air-valve 6 and/or lower air-valve 13 and passes through lower jet pipe 52
Into the exhaust gas volumn ratio 2 of burner hearth:8~8:2.
Since based on inert gas, temperature and oxygen concentration are relatively low in flue gas recycled, burner hearth highest can be effectively reduced
Flame temperature inhibits burning velocity, reduces NOxGeneration.Simultaneously because the reduction of combustion temperature in hearth, can effectively solve to stain
Coking problem, adaptability of the enhancing burner hearth to coal of burning.It takes flue gas recycled respectively by First air and OFA air outlets
Be passed through in burner hearth, proportion, compared to being directly passed through by First air area, influenced caused by the combustion case of coal dust compared with
It is small, while the temperature levels of burner hearth can be reduced again.
In specific implementation process, the seal and thermal insulation that ensure flue gas recirculation pipeline are needed so that introduce boiler
Flue gas recycled oxygen concentration be less than 6%, flue-gas temperature be not less than 120 DEG C, to make to be easily formed anoxycausis in burner hearth
Environment, and to fire box temperature adjust it is also controllable.
When boiler is run under rated load, it can be slowly increased flue gas recycled flow, jet pipe 51 and lower jet pipe in adjusting
Ratio and First air, the Secondary Air ratio of 52 flue gas recycled flow are suitable, while monitoring under burner region fire box temperature
Drop is not less than 1300 DEG C within 150 DEG C.It, can depending on the carrying out practically situation of boiler when boiler, which is under underload, to be run
It is appropriate to increase the ratio towards the flue gas of upper jet pipe, it on the one hand controls lower jet pipe and upper jet pipe flue gas ratio is not less than 2:8, it is another
Aspect ensures that the fire box temperature of burner region declines within 150 DEG C.And when load is too low, it should gradually reduce and total follow again
Ring exhaust gas volumn is until cancel flue gas recirculation, to maintain the normal temperature level of burner hearth, it is ensured that stable burning.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of boiler smoke recirculating system, the system can be used in boiler dust remover (1) exiting flue gas being transmitted back to pot
Stove burner hearth (10), burner hearth (10) the top most end level-one burnout degree mouth are OFA air outlets (8), and burner hearth (10) lower part is set
It is equipped with primary air nozzle (7), it is characterised in that：The system comprises wind turbine (2), blast main (3), sub- air hose (4) and jet pipe groups
(5)；The wind turbine (2) is arranged on the blast main (3), and blast main (3) initiating terminal exports phase with the deduster (1)
Even；Blast main (3) end is located at the boiler furnace (10) lower outside, and the sub- air hose (4) is connected to total wind
Manage (3) end；The jet pipe group (5) is connected to sub- air hose (4) end；The jet pipe group (5) include upper jet pipe (51) and
Lower jet pipe (52), top OFA air outlet (8) of upper jet pipe (51) the opening setting in the boiler furnace (10)；Under described
Primary air nozzle (7) of jet pipe (52) the opening setting in the boiler furnace (10).
2. boiler smoke recirculating system according to claim 1, it is characterised in that：It is provided on the blast main (3)
Total air-valve (9), for adjusting the amount of flue gas emission by the blast main (3) loopback；It is provided with sub- air-valve on the sub- air hose (4)
(12), it is used to adjust the flue gas flow by the sub- air hose (4)；It is provided on the upper jet pipe (51) of the jet pipe group (5)
It is provided with lower air-valve (13) on air-valve (6) and/or lower jet pipe (52), passes through the upper jet pipe (51) and/or lower spray for adjusting
Manage the exhaust gas volumn that (52) spray into the burner hearth (10).
3. boiler smoke recirculating system according to claim 1 or 2, it is characterised in that：The sub- air hose (4) includes the
One sub- air hose (4a) and the second sub- air hose (4b), the first sub- air hose (4a) and the second sub- air hose (4b) are symmetricly set on described
Blast main (3) end.
4. boiler smoke recirculating system according to claim 3, it is characterised in that：The first sub- air hose (4a) and
Two sub- air hoses (4b) are in horizontally disposed.
5. boiler smoke recirculating system according to claim 3, it is characterised in that：The jet pipe group (5) and the son
Air hose (4) is correspondingly arranged, the jet pipe group (5) include the first jet pipe group being connected with the described first sub- air hose (4a) and with it is described
The second connected jet pipe group of second sub- air hose (4b)；The first jet pipe group is symmetricly set on the stove with the second jet pipe group
On the outside of two opposite sides of thorax (10).
6. boiler smoke recirculating system according to claim 3, it is characterised in that：The sub- air-valve (12) includes setting
The first sub- air-valve (12a) on the described first sub- air hose (4a) and/or be arranged on the described second sub- air hose (4b) second
Sub- air-valve (12b).
7. boiler smoke recirculating system according to claim 2, it is characterised in that：The upper air-valve (6) and/or leeward
Valve (13) can be used in adjusting the exhaust gas volumn ratio by upper jet pipe (51) and lower jet pipe (52), and make through upper jet pipe (51)
Exhaust gas volumn with by the ratio between exhaust gas volumn of lower jet pipe (52) be 2:8~8:2.
8. a kind of boiler smoke method for recycling uses boiler smoke recirculating system as described in claim 1, feature
It is：The method includes
By boiler combustion and purified partial fume, being extracted from deduster (1) outlet by wind turbine (2) becomes recycling cigarette
Gas；
So that flue gas recycled is sequentially entered connected blast main (3) and sub- air hose (4), then will be recycled by jet pipe group (5)
Flue gas is assigned to jet pipe (51) and lower jet pipe (52), sprays into OFA air outlets (8) and primary air nozzle (7) respectively, becomes top and follow
Ring flue gas and lower part circulating flue gas adjust ignition temperature and oxygen content in burner hearth (10).
9. boiler smoke method for recycling according to claim 8, it is characterised in that：Flue gas recycled passes through total air-valve
(9) flow is adjusted, it is 10~30% to make its recirculation rate.
10. boiler smoke method for recycling according to claim 9, it is characterised in that：Flue gas recycled passes through upper air-valve
(6) and/or lower air-valve (13) adjusts the exhaust gas volumn ratio that distribution enters burner hearth by upper jet pipe (51) and by lower jet pipe (52)
2:8~8:2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810623758.9A CN108592015A (en) | 2018-06-15 | 2018-06-15 | A kind of boiler smoke recirculating system and its method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810623758.9A CN108592015A (en) | 2018-06-15 | 2018-06-15 | A kind of boiler smoke recirculating system and its method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059526A (en) * | 2018-10-16 | 2020-04-24 | 湖北北新建材有限公司 | System for improving coal-fired efficiency |
| CN112460576A (en) * | 2020-11-23 | 2021-03-09 | 西安热工研究院有限公司 | Boiler smoke and air system suitable for deep peak regulation and peak regulation method |
| WO2021203678A1 (en) * | 2020-04-08 | 2021-10-14 | 西安热工研究院有限公司 | Burning high-alkali coal slagging contamination prevention and control method based on boiler zone control |
| CN114719279A (en) * | 2022-04-24 | 2022-07-08 | 西安热工研究院有限公司 | Biomass coupling coal-fired boiler system and combustion control method |
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| WO2021203678A1 (en) * | 2020-04-08 | 2021-10-14 | 西安热工研究院有限公司 | Burning high-alkali coal slagging contamination prevention and control method based on boiler zone control |
| CN112460576A (en) * | 2020-11-23 | 2021-03-09 | 西安热工研究院有限公司 | Boiler smoke and air system suitable for deep peak regulation and peak regulation method |
| CN114719279A (en) * | 2022-04-24 | 2022-07-08 | 西安热工研究院有限公司 | Biomass coupling coal-fired boiler system and combustion control method |
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