CN208635098U - A kind of boiler smoke recirculating system - Google Patents
A kind of boiler smoke recirculating system Download PDFInfo
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- CN208635098U CN208635098U CN201820932839.2U CN201820932839U CN208635098U CN 208635098 U CN208635098 U CN 208635098U CN 201820932839 U CN201820932839 U CN 201820932839U CN 208635098 U CN208635098 U CN 208635098U
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Abstract
A kind of boiler smoke recirculating system, including blower, blast main, sub- air hose and jet pipe group etc..Blower is arranged on blast main, and blast main starting point 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 outlet of boiler furnace is arranged in upper jet pipe opening；The primary air nozzle of boiler furnace is arranged in lower jet pipe opening.Flue gas recycled makes its recirculation rate 10~30% by total wind valve regulating flow, and flue gas recycled enters exhaust gas volumn ratio 2:8~8:2 of burner hearth by upper air-valve and/or adjusting distribution by upper jet pipe and by lower jet pipe.The utility model effectively adjusts burner hearth flame temperature and furnace exit temperature by flue gas flow proportion adjustment above and below the adjusting of flue gas recirculation rate and burner hearth, flexible operation, simple；And discharged nitrous oxides are reduced, improve the contamination for using high basic metal fuel.
Description
Technical field
The utility model relates to a kind of boiler smoke recirculating systems, belong to combustion technology technical field.
Background technique
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
Nitrogen oxides (NO at minimum discharge transformation, i.e., in boiler smokex) concentration be lower 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, current contamination prevention and control measure will increase dramatically boiler operatiopn cost.
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 the contamination problems of roof of the furnace convection heating surface caused by using high basic metal coal.Therefore,
Need a kind of method that can effectively adjust burner hearth flame temperature and furnace outlet section temperature.
Utility model content
The utility model be intended to provide one kind can flexible modulation flue gas recirculation ratio boiler smoke recirculating system and
Its method.
The technical solution of the utility model 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 blower, blast main, sub- air hose and jet pipe groups；The blower is arranged in institute
It states on blast main, the blast main starting point 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 outlet of the boiler furnace is arranged in the upper jet pipe opening；It is described
The primary air nozzle of 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 for passing through the sub- air hose；The jet pipe group
Upper jet pipe on be provided with upper air-valve and/or lower air-valve, the furnace 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 on described second sub- air hose is set.
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 2:8~8:2 by the ratio between exhaust gas volumn of lower jet pipe.
In above-mentioned technical proposal, total air-valve by adjust flue gas recycled flow, make its recirculation rate 10~
30%, decline burner region burner hearth maximum temperature in 150 DEG C, to guarantee fuel stabilization full combustion, and NOxGeneration can
To reduce by 25% or so.Recirculation rate is the ratio of flue gas recycled amount and total exhaust gas volumn.
The utility model has the following advantages that and the technical effect of high-lighting: 1. the utility model is by will be low after deduster
Warm flue gas recirculation 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
Save furnace flame temperature and furnace exit temperature, it is flexible operation, simple；2. flue gas recycled oxygen content is lower than 6%, pass through adjusting
Nitrogen oxides (NO can be effectively controlled in furnace flame temperaturex) generate, reduce nitrogen oxides (NOx) discharge, it reduces environmental pollution；③
By adjusting fire box temperature and furnace exit temperature, it is heated that roof of the furnace convection current when using fuel containing high basic metal can be effectively improved
The contamination problems in face increase boiler oil applicability.
Detailed description of the invention
Fig. 1 is boiler smoke recirculating system schematic diagram involved in the utility model.
Fig. 2 is the A-A partial cutaway schematic of Fig. 1.
Fig. 3 is the B-B partial cutaway schematic of Fig. 1.
In figure: 1-deduster；2-blowers；3-blast mains；4-sub- air hoses；The sub- air hose of 4a-the first；4b-the second
Air hose；5-jet pipe groups；51-upper jet pipes；52-lower jet pipes；The lower jet pipe of 52a-the first；The lower jet pipe of 52b-the second；6-upper-
Air-valve；6a-the first upper air-valve；6b-the second upper air-valve；7-primary air nozzles；8-OFA air outlets；9-total air-valves；10- furnace
Thorax；11-pendant superheaters；12-sub- air-valves；The sub- air-valve of 12a-the first；The sub- air-valve of 12b-the second；13-lower air-valves；13a―
First lower air-valve；13b-the second lower air-valve.
Specific embodiment
Specific embodiment of the present utility model and the course of work are further described with reference to the accompanying drawing.
The positional terms such as the upper, lower, left, right, front and rear in present specification be positional relationship based on the figure and
It establishes.Attached drawing is different, then corresponding positional relationship is also possible to change therewith, therefore cannot be interpreted as with this to protection model
The restriction enclosed.
As shown in Figure 1, a kind of boiler smoke recirculating system, including blower 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 outlet 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 fluidized bed or layer burner, First air feeds burner hearth by an air compartment, accordingly
, primary air nozzle is located at an air compartment.
The direction of the utility model boiler is defined according to the common understanding of those skilled in the art, i.e., as shown in Figure 1, leaning on
Caudad flue, deduster side be the rear side of boiler furnace, wall after the corresponding wing furnace bore wall face is known as；Wall phase after burner hearth
Pair the other side be boiler furnace front wall, and the two sides of burner hearth longitudinal direction are the side wall of burner hearth.
3 starting point of blast main is arranged on 1 exhaust pass of deduster, and blower 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 sub- 4 end of air hose；Jet pipe group 5 includes upper jet pipe 51 and lower jet pipe 52, and the upper opening of jet pipe 51 is arranged in boiler
The top OFA air outlet 8 of burner hearth 10；Lower jet pipe 52, which is open, is arranged in the primary air nozzle 7 of boiler furnace 10.
When the sub- air hose 4 of flue gas recirculation system and jet pipe group 5 are all only arranged one group, furnace can be arranged in jet pipe group 5
10 any surface of thorax is provided on the furnace wall of OFA air outlet 8 and primary air nozzle, and sub- air hose 4 makes jet pipe group 5 be connected with blast main 3.
Total air-valve 9 is provided on blast main 3, for adjusting the amount of flue gas emission for passing through 3 loopback of blast main.It can on sub- air hose 4
To be provided with sub- air-valve 12, when especially the sub- air hose of setting multiple groups 4 is in parallel, can by the aperture adjustment of corresponding sub- air-valve come
The flue gas flow that control passes through any group of sub- air hose.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 sub- 4 side of 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 for spraying into burner hearth 10 by 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), enter furnace 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 2:8~8:2 by the ratio between exhaust gas volumn of lower jet pipe 52.
As shown in figure 3, flue gas can be made more equal when the sub- air hose 4 of flue gas recirculation system and jet pipe group 5 are arranged two groups
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 is 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 two 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 the lower jet pipe 52a of jet pipe 51a and second 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 jet pipe 52b under jet pipe 52a and second under first, adjusts respectively
The lower jet pipe 52b of the lower jet pipe 52a and second of section first 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 blower 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
Gas is assigned to jet pipe 51 and lower jet pipe 52, sprays into OFA air outlet 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, makes its recirculation rate 10~30%, makes to fire
Burner region burner hearth maximum temperature declines in 150 DEG C, to guarantee fuel stabilization full combustion, 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 exhaust gas volumn ratio 2:8~8:2 of burner hearth.
Since based on inert gas, temperature and oxygen concentration are lower in flue gas recycled, burner hearth highest can effectively reduce
Flame temperature inhibits burning velocity, reduces NOxGeneration.Simultaneously because the reduction of combustion temperature in hearth, can effectively solve contamination
Coking problem, adaptability of the enhancing burner hearth to burning coal.It takes flue gas recycled respectively by First air and OFA air outlet
Be passed through in burner hearth, proportion, compared to being directly passed through by First air area, the influence 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 the specific implementation process, need to guarantee the airtightness and thermal insulation of flue gas recirculation pipeline, so that introducing boiler
Flue gas recycled oxygen concentration be lower 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 practival operating condition of boiler when boiler, which is under underload, to be run
It is appropriate to increase the ratio for leading to 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 above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (8)
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
Furnace burner hearth (10), burner hearth (10) the top most end level-one burnout degree mouth are OFA air outlet (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 blower (2), blast main (3), sub- air hose (4) and jet pipe groups
(5)；The blower (2) is arranged on the blast main (3), and blast main (3) starting point 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: be provided on the blast main (3)
Total air-valve (9), for adjusting the amount of flue gas emission by the blast main (3) loopback；Sub- air-valve is provided on the sub- air hose (4)
(12), for adjusting 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)
Lower air-valve (13) are provided on air-valve (6) and/or lower jet pipe (52), pass 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 and the second jet pipe group are symmetricly set on the furnace
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. boiler smoke recirculating system according to claim 2, it is characterised in that: total air-valve (9) can pass through
The flow for adjusting flue gas recycled, makes flue gas recirculation rate 10~30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201820932839.2U CN208635098U (en) | 2018-06-15 | 2018-06-15 | A kind of boiler smoke recirculating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820932839.2U CN208635098U (en) | 2018-06-15 | 2018-06-15 | A kind of boiler smoke recirculating system |
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| CN208635098U true CN208635098U (en) | 2019-03-22 |
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ID=65734127
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| CN201820932839.2U Active CN208635098U (en) | 2018-06-15 | 2018-06-15 | A kind of boiler smoke recirculating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108592015A (en) * | 2018-06-15 | 2018-09-28 | 清华大学 | A kind of boiler smoke recirculating system and its method |
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2018
- 2018-06-15 CN CN201820932839.2U patent/CN208635098U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108592015A (en) * | 2018-06-15 | 2018-09-28 | 清华大学 | A kind of boiler smoke recirculating system and its method |
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