CN207514895U - For the combustion system of pulverized-coal fired boiler ultra-low load steady combustion - Google Patents
For the combustion system of pulverized-coal fired boiler ultra-low load steady combustion Download PDFInfo
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- CN207514895U CN207514895U CN201721294248.9U CN201721294248U CN207514895U CN 207514895 U CN207514895 U CN 207514895U CN 201721294248 U CN201721294248 U CN 201721294248U CN 207514895 U CN207514895 U CN 207514895U
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Abstract
The utility model provides a kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady, and the pulverized coal channel bifurcated of at least two coal pulverizer outlets is conventional pulverized-coal pipeline and underload pulverized coal channel；Conventional pulverized-coal pipeline connects a wind combustor, and one time wind combustor is set on boiler body；Underload pulverized coal channel is equipped with dense-and-weak separator, and dense-and-weak separator outlet is equipped with dense, thin powdered coal pipeline, and dense, thin powdered coal pipeline connects dense, thin powdered coal burner respectively, and dense, thin powdered coal burner is set on above the main burner of boiler body.During normal duty, coal dust enters hearth combustion by conventional pulverized-coal pipeline, a wind combustor；During ultra-low load, coal dust enters hearth combustion by underload pulverized coal channel and dense, thin powdered coal burner.The coal powder density of breeze airflow when the coal powder density of thick coal culm air-flow can reach rated load.The utility model is in the case of without combustion-supporting equipment, so that it may so as to stablize burning under 15%~20% ultra-low load of pulverized-coal fired boiler.
Description
Technical field
The utility model is related to a kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady, it can be achieved that boiler is 15%
Stablize burning under~20% ultra-low load, belong to Combustion System of Boiler Burning Fine technical field.
Background technology
In recent years, the Renewable Energy Developments such as China's wind-powered electricity generation, photoelectricity are rapid.However the regenerative resources such as wind-powered electricity generation, photoelectricity
Unstability needs power grid to have stronger peak modulation capacity.In addition the unstability of electricity consumption side power load, also to the tune of power grid
Peak energy power proposes higher requirement.The deficiency of peak modulation capacity so that the northern area of China, which frequently occurs, serious " to be abandoned wind, abandons
Light " phenomenon.
Fired power generating unit is the current main force's unit in China, and installed capacity accounts for 65% or so of national installed capacity, generated energy
Even more account for more than 70% national generating capacity.Promote the peak modulation capacity of power grid, it is necessary to greatly improve the peak regulation energy of fired power generating unit
Power.The flexibility transformation of fired power generating unit is imperative.The minimum steady combustion load of conventional bituminous coal fired boiler is 30% or so, meager coal, nothing
The minimum steady of bituminous coal fired boiler fires load 40%~50% or so.Continue to reduce with load, one side in-furnace temperature declines；
The steady combustion characteristic of another aspect burner also declines.The phenomenon that continuing to reduce boiler load, unstable combustion may be generated.
By taking certain 600MW grade tangentially-fired boiler as an example.As shown in Figure 1, the combustion system of entire boiler is by boiler
Ontology 1, primary air fan 2, coal pulverizer 3, pulverized coal channel 4, wind combustors 5, overfire air fan 6, big bellows 7, an overfire air ports 8
Deng composition.The First air that primary air fan 2 generates by coal pulverizer 3, carries coal dust, passes through 4, wind combustors 5 of pulverized coal channel
The Secondary Air formed into hearth combustion, overfire air fan 6 into big bellows 7, enters burner hearth auxiliary combustion by overfire air port 8
It burns.
In this example, boiler is equipped with six coal pulverizers, and a coal pulverizer matches one layer of four wind combustor 5.Coal pulverizer " five
It is standby with one ", when rated load, puts into operation five coal pulverizers.20% Coal-fired capacity when every coal pulverizer undertakes boiler rated load.One
The coal-air ratio of secondary wind is 1.8~2.2 or so.Wherein, the air quantity of First air determines that coal-supplying amount is by boiler by the ventilation quantity of coal pulverizer
Load determines.For the coal pulverizer determining to certain, when coal-supplying amount declines, ventilation quantity also declines therewith.But when ventilation quantity declines
When to a certain extent, 70% or so generally in coal pulverizer Maximum Ventilatory Volume, ventilation quantity will no longer decline.Continuing to decline may lead
Wind speed is too low in cause coal pulverizer, pulverized coal channel, and then coal dust occurs and blocks.
When Ultra-low load operation of the boiler 15%~20%.In order to ensure boiler operatiopn safety, regulatory requirements boiler
Must put into operation two coal pulverizers.At this time the Coal-fired capacity of boiler also only have rated load when 15%~20% or so, every coal-grinding
Separate unit coal-grinding amount when the coal-grinding amount of machine only has 7.5%~10% or so of rated load boiler fired coal amount, only rated load
37.5%~50% or so, and the ventilation quantity of coal pulverizer be rated load when 70% or so.At this point, the coal-air ratio of First air is
1.4~1.8 times of rated load, far beyond the coal-air ratio range that burner can surely fire, under the steady combustion characteristic of burner
Drop.Boiler can not be realized stablizes burning under 15%~20% load, can only be helped by throwing oil gun, plasma apparatus etc.
Combustion.
Utility model content
The technical problems to be solved in the utility model is how to make pulverized-coal fired boiler under without combustion-supporting equipment, 15%~20%
Stablize burning under ultra-low load.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is to provide a kind of ultralow negative for pulverized-coal fired boiler
The combustion system that lotus is surely fired, including at least two coal pulverizers, primary air fan connection coal pulverizer air inlet, coal pulverizer outlet is equipped with coal
Powder pipeline, it is characterised in that：The pulverized coal channel bifurcated of at least two coal pulverizer outlets is conventional pulverized-coal pipeline and underload coal
Powder pipeline；
Conventional pulverized-coal pipeline connects a wind combustor, and one time wind combustor is set on boiler body；
Underload pulverized coal channel is equipped with dense-and-weak separator, and dense-and-weak separator outlet is equipped with thick coal culm pipeline, thin powdered coal
Pipeline, thick coal culm pipeline connection thick coal culm burner, thin powdered coal pipeline connection thin powdered coal burner, thick coal culm burner, light coal
Powder burner is set on boiler body.
Preferably, the conventional pulverized-coal pipeline, underload are with being equipped with valve on pulverized coal channel.
It is highly preferred that during normal duty, the valve on conventional pulverized-coal pipeline is opened, the valve on underload pulverized coal channel
It closes；During 15%~20% ultra-low load, the valve on conventional pulverized-coal pipeline is closed, and the valve on underload pulverized coal channel is beaten
It opens.
Preferably, the pulverized coal channel of at least two coal pulverizer outlets has carried out bifurcated, forms at least two layers dense First air combustion
Burner, an at least two layers light wind combustor, each dense wind combustor are adjacently positioned, and concentrate on a region so that heat is negative
Lotus is concentrated, and is conducive to Boiler Stable Combustion.
Preferably, the thick coal culm burner, thin powdered coal burner are set on above the main burner of boiler body.
Preferably, during normal duty, coal dust enters hearth combustion by conventional pulverized-coal pipeline, a wind combustor；15%
During~20% ultra-low load, coal dust enters burner hearth by underload pulverized coal channel and thick coal culm burner, thin powdered coal burner
Burning.
It is highly preferred that during 15%~20% ultra-low load, breeze airflow is divided into dense, light two strands of coals by dense-and-weak separator
Powder air-flow enters hearth combustion by dense, thin powdered coal burner respectively；Wherein, the coal powder density of thick coal culm air-flow is compared to deep or light
Not separated breeze airflow concentration before separator improves, the coal powder density of breeze airflow when reaching rated load.
Combustion system provided by the utility model overcomes the deficiencies in the prior art, in the case of without combustion-supporting equipment, just
It can make to stablize burning under 15%~20% ultra-low load of pulverized-coal fired boiler；System structure is simple, dependable performance, at low cost, suitable
It promotes the use of on a large scale.
Description of the drawings
Fig. 1 is the combustion system schematic diagram of conventional pulverized-coal boiler；
Fig. 2 is the combustion system schematic diagram provided in this embodiment for the combustion of pulverized-coal fired boiler ultra-low load steady.
Specific embodiment
With reference to specific embodiment, the utility model is expanded on further.It should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model.In addition, it should also be understood that, in the content for having read the utility model instruction
Later, those skilled in the art can make various changes or modifications the utility model, and such equivalent forms equally fall within this Shen
It please the appended claims limited range.
Fig. 2 fires combustion system layout drawing for certain 600MW grade boilers ultra-low load steady.Boiler uses corner tangential firing side
Formula, with 6 coal pulverizers 3, number is respectively A, B, C, D, E, F.Every coal pulverizer matches one layer of coal burner 5.Wherein A, B, C, D
Coal pulverizer outlet pulverized coal channel is consistent with conventional combustion system, and E, F coal pulverizer outlet 4 bifurcated of pulverized coal channel are conventional pulverized-coal pipeline
41st, underload pulverized coal channel 42.Conventional pulverized-coal pipeline 41, underload be separately installed on pulverized coal channel 42 shut-off valve 411,
421.Underload is made breeze airflow be divided into dense, light two strands, is passed through respectively with dense-and-weak separator 422 is equipped on pulverized coal channel 42
Dense, thin powdered coal pipeline 423,424 enters dense, thin powdered coal burner 501,502.Two layers of dense, arrangement of thin powdered coal burner 501,502
Above former main burner, when ultra-low load puts into operation, be conducive to improve furnace flame height, improve furnace outlet gas temperature and
Main, reheat steam temperature.
Wherein, two layers of thick coal culm burner 501 is adjacently positioned so that thermic load is concentrated, and raising breeze airflow catches fire steady
It is qualitative.
During conventional load, boiler operatiopn is consistent with conventional combustion system.E, put into operation the outlet of F coal pulverizers conventional pulverized-coal pipeline
41.During ultra-low load, boiler puts into operation E, F coal pulverizer, and put into operation the outlet of E, F coal pulverizer underload pulverized coal channel 42.Breeze airflow quilt
Dense-and-weak separator is divided into dense, light two strands, enters hearth combustion by dense, thin powdered coal burner.Wherein, coal dust in thick coal culm air-flow
Concentration has to be improved by a relatively large margin, the coal powder density of breeze airflow when can reach rated load.Thick coal culm air-flow apoplexy powder compares
Low, the ignition heat of breeze airflow is relatively low, can catch fire rapidly, improves steady combustion ability of the boiler under ultra-low load.Meanwhile two layers
Thick coal culm burner is adjacently positioned so that boiler heat load is concentrated, and can be effectively improved boiler low load stable combustion ability, be may be such that pot
Stove stablizes burning in the case that without combustion-supporting measure under 15%~20% ultra-low load.
Claims (6)
1. a kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady, including at least two coal pulverizers (3), primary air fan
(2) coal pulverizer (3) air inlet is connected, coal pulverizer (3) outlet is equipped with pulverized coal channel (4), it is characterised in that：At least two coal pulverizers
(3) pulverized coal channel (4) bifurcated of outlet is conventional pulverized-coal pipeline (41) and underload pulverized coal channel (42)；
Conventional pulverized-coal pipeline (41) connects a wind combustor (5), and a wind combustor (5) is on boiler body (1)；
Underload pulverized coal channel (42) is equipped with dense-and-weak separator (422), and dense-and-weak separator (422) outlet is equipped with thick coal culm pipe
Road (423), thin powdered coal pipeline (424), thick coal culm pipeline (423) connection thick coal culm burner (501), thin powdered coal pipeline (424)
Thin powdered coal burner (502) is connected, thick coal culm burner (501), thin powdered coal burner (502) are on boiler body (1).
2. a kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady as described in claim 1, it is characterised in that：It is described
Conventional pulverized-coal pipeline (41), underload are equipped with valve on pulverized coal channel (42).
3. a kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady as claimed in claim 2, it is characterised in that：Normally
During load, the valve on conventional pulverized-coal pipeline (41) is opened, and underload is closed with the valve on pulverized coal channel (42)；15%~
During 20% ultra-low load, the valve on conventional pulverized-coal pipeline (41) is closed, and underload is opened with the valve on pulverized coal channel (42).
4. a kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady as described in claim 1, it is characterised in that：At least
The pulverized coal channel (4) of two coal pulverizers (3) outlet has carried out bifurcated, forms an at least two layers dense wind combustor (501), at least
Two layers of light wind combustor (502), each dense wind combustor (501) are adjacently positioned.
5. a kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady as described in claim 1 or 4, it is characterised in that：
The thick coal culm burner (501), thin powdered coal burner (502) are above the main burner of boiler body (1).
6. a kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady as described in claim 1 or 3, it is characterised in that：
During normal duty, coal dust is by conventional pulverized-coal pipeline (41), a wind combustor (5) into hearth combustion；15%~20% surpass
During underload, coal dust by underload pulverized coal channel (42) and thick coal culm burner (501), thin powdered coal burner (502) into
Enter hearth combustion.
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| CN201721294248.9U CN207514895U (en) | 2017-10-09 | 2017-10-09 | For the combustion system of pulverized-coal fired boiler ultra-low load steady combustion |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107606603A (en) * | 2017-10-09 | 2018-01-19 | 上海锅炉厂有限公司 | A kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady |
| CN111947133A (en) * | 2020-08-31 | 2020-11-17 | 华北电力科学研究院有限责任公司 | Boiler, combustion system thereof and use method |
| CN112555885A (en) * | 2020-11-06 | 2021-03-26 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal powder concentration and dilution separation device and coal-fired boiler combustion system |
| CN113776049A (en) * | 2021-09-14 | 2021-12-10 | 西安热工研究院有限公司 | Front-rear wall opposed firing boiler refined combustion air distribution control system and method |
| CN111947134B (en) * | 2020-08-31 | 2024-06-07 | 华北电力科学研究院有限责任公司 | Powder preparation combustion system |
-
2017
- 2017-10-09 CN CN201721294248.9U patent/CN207514895U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107606603A (en) * | 2017-10-09 | 2018-01-19 | 上海锅炉厂有限公司 | A kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady |
| CN111947133A (en) * | 2020-08-31 | 2020-11-17 | 华北电力科学研究院有限责任公司 | Boiler, combustion system thereof and use method |
| CN111947133B (en) * | 2020-08-31 | 2024-06-07 | 华北电力科学研究院有限责任公司 | Boiler and combustion system and use method thereof |
| CN111947134B (en) * | 2020-08-31 | 2024-06-07 | 华北电力科学研究院有限责任公司 | Powder preparation combustion system |
| CN112555885A (en) * | 2020-11-06 | 2021-03-26 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal powder concentration and dilution separation device and coal-fired boiler combustion system |
| CN113776049A (en) * | 2021-09-14 | 2021-12-10 | 西安热工研究院有限公司 | Front-rear wall opposed firing boiler refined combustion air distribution control system and method |
| CN113776049B (en) * | 2021-09-14 | 2023-02-28 | 西安热工研究院有限公司 | Front-rear wall opposed firing boiler refined combustion air distribution control system and method |
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