CN107606603A - A kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady - Google Patents
A kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady Download PDFInfo
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- CN107606603A CN107606603A CN201710931919.6A CN201710931919A CN107606603A CN 107606603 A CN107606603 A CN 107606603A CN 201710931919 A CN201710931919 A CN 201710931919A CN 107606603 A CN107606603 A CN 107606603A
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Abstract
The invention 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 a wind combustor is on boiler body；Underload pulverized coal channel is provided with dense-and-weak separator, and dense-and-weak separator outlet is provided 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 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 present invention is in the case of without combustion-supporting equipment, so that it may so that stable burning under the ultra-low load of pulverized-coal fired boiler 15%~20%.
Description
Technical field
The present invention relates to a kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady, can be achieved boiler 15%~
Stable burning, belongs to Combustion System of Boiler Burning Fine technical field under 20% ultra-low load.
Background technology
In recent years, the Renewable Energy Development such as China's wind-powered electricity generation, photoelectricity is rapid.But the regenerative resource such as wind-powered electricity generation, photoelectricity
Unstability is, it is necessary to which power network possesses stronger peak modulation capacity.In addition the unstability of electricity consumption side power load, also to the tune of power network
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 the 70% of national generating capacity.Lift the peak modulation capacity of power network, 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.Continue to reduce boiler load, the phenomenon of unstable combustion may be produced.
By taking certain 600MW grade tangentially-fired boiler as an example.As shown in figure 1, the combustion system of whole boiler is by boiler
Body 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.First air caused by primary air fan 2, by coal pulverizer 3, coal dust is carried, 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, burner hearth auxiliary combustion is entered by overfire air port 8
Burn.
In this example, boiler is provided with six coal pulverizers, and a coal pulverizer matches somebody with somebody one layer of four wind combustor 5.Coal pulverizer " five
It is standby with one ", put into operation during rated load 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 of coal pulverizer
Load determines.For the coal pulverizer of certain determination, when coal-supplying amount declines, ventilation also declines therewith.But when ventilation declines
When to a certain extent, 70% or so typically in coal pulverizer Maximum Ventilatory Volume, ventilation will no longer decline.Continuing 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 be put into operation two coal pulverizers.Now 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 70% or so when the ventilation of coal pulverizer is rated load.Now, the coal-air ratio of First air is
1.4~1.8 times of rated load, the coal-air ratio scope that can be surely fired far beyond burner, under the steady combustion characteristic of burner
Drop.Boiler can not realize the stable burning under 15%~20% load, can only be helped by throwing oil gun, plasma apparatus etc.
Combustion.
The content of the invention
The technical problem to be solved in the present invention is how to make pulverized-coal fired boiler under without combustion-supporting equipment, ultralow 15%~20%
Stable burning under load.
In order to solve the above-mentioned technical problem, the technical scheme is that providing one kind is used for pulverized-coal fired boiler ultra-low load steady
The combustion system of combustion, including at least two coal pulverizers, primary air fan connection coal pulverizer air inlet, coal pulverizer outlet is provided with coal pipe
Road, 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 pipe
Road；
Conventional pulverized-coal pipeline connects a wind combustor, and a wind combustor is on boiler body；
Underload pulverized coal channel is provided with dense-and-weak separator, and dense-and-weak separator outlet is provided 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 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
Close；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
Open.
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 advantageous to Boiler Stable Combustion.
Preferably, the thick coal culm burner, thin powdered coal burner are 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, hearth combustion is entered 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 invention overcomes the deficiencies in the prior art, in the case of without combustion-supporting equipment, it is possible to
Make stable burning under the ultra-low load of pulverized-coal fired boiler 15%~20%；System architecture is simple, and dependable performance, cost is low, suitable big model
Enclose and promote the use of.
Brief 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 for being used for the combustion of pulverized-coal fired boiler ultra-low load steady that the present embodiment provides.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention lectured has been read, people in the art
Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Scope.
Fig. 2 is that certain 600MW grade boilers ultra-low load steady fires combustion system layout drawing.Boiler uses corner tangential firing side
Formula, with 6 coal pulverizers 3, numbering is respectively A, B, C, D, E, F.Every coal pulverizer matches somebody with somebody 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 bifurcated of pulverized coal channel 4 are conventional pulverized-coal pipeline
41st, underload pulverized coal channel 42.Conventional pulverized-coal pipeline 41, underload be separately installed with pulverized coal channel 42 shut-off valve 411,
421.Underload is made breeze airflow be divided into dense, light two strands, passed through respectively with dense-and-weak separator 422 is provided with 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 advantageous 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 is in the case of without combustion-supporting measure, the stable burning under 15%~20% ultra-low load.
Claims (7)
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 provided 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 is provided with dense-and-weak separator (422) with pulverized coal channel (42), and dense-and-weak separator (422) outlet is provided 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).
A kind of 2. combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady as claimed in claim 1, it is characterised in that：It is described
Conventional pulverized-coal pipeline (41), underload are equipped with valve with pulverized coal channel (42).
A kind of 3. 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).
A kind of 4. combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady as claimed 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.
A kind of 5. 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).
A kind of 6. 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 enters hearth combustion by conventional pulverized-coal pipeline (41), a wind combustor (5)；15%~20% surpass
During underload, coal dust is entered by underload pulverized coal channel (42) and thick coal culm burner (501), thin powdered coal burner (502)
Enter hearth combustion.
A kind of 7. combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady as claimed in claim 6, it is characterised in that：It is described
During 15%~20% ultra-low load, breeze airflow is divided into dense, light two strands of breeze airflows by dense-and-weak separator (422), passes through respectively
Dense, thin powdered coal burner enters hearth combustion；Wherein, the coal powder density of thick coal culm air-flow is compared to before dense-and-weak separator (422)
Not separated breeze airflow concentration improve, the coal powder density of breeze airflow when reaching rated load.
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| CN201710931919.6A CN107606603A (en) | 2017-10-09 | 2017-10-09 | A kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady |
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|---|---|---|---|
| CN201710931919.6A CN107606603A (en) | 2017-10-09 | 2017-10-09 | A kind of combustion system for the combustion of pulverized-coal fired boiler ultra-low load steady |
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ID=61068707
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109268870A (en) * | 2018-10-30 | 2019-01-25 | 苏州吉杰电力科技有限公司 | A kind of pulverized coal preparation system that flame kernel is controllable mill dislocation pulverized coal channel arragement construction |
| CN109668144A (en) * | 2018-11-21 | 2019-04-23 | 大唐东北电力试验研究院有限公司 | A kind of combustion system optimized and revised for the wide load steam temperature of circle of contact pulverized-coal fired boiler |
| CN110332523A (en) * | 2019-08-20 | 2019-10-15 | 烟台龙源电力技术股份有限公司 | Boiler system |
| CN111947134A (en) * | 2020-08-31 | 2020-11-17 | 华北电力科学研究院有限责任公司 | Pulverizing combustion system |
| 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 |
| CN112555819A (en) * | 2020-11-18 | 2021-03-26 | 哈尔滨锅炉厂有限责任公司 | Tangential combustor arrangement mode for ultralow-load flexible peak regulation of boiler |
| CN113280360A (en) * | 2021-06-25 | 2021-08-20 | 西安热工研究院有限公司 | Coal mill operation method suitable for deep peak shaving of boiler |
| CN113513767A (en) * | 2021-07-19 | 2021-10-19 | 国网天津市电力公司电力科学研究院 | Switching and stable combustion device and method for coal mill of deep peak shaving coal-fired unit |
| CN114413278A (en) * | 2022-01-04 | 2022-04-29 | 华北电力科学研究院有限责任公司 | Method for determining highest oxygen concentration of primary air, and low-load stable combustion method and system of pulverized coal boiler |
| CN116608461A (en) * | 2023-06-25 | 2023-08-18 | 北京天地融创科技股份有限公司 | Combustion system and boiler system with same |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109268870A (en) * | 2018-10-30 | 2019-01-25 | 苏州吉杰电力科技有限公司 | A kind of pulverized coal preparation system that flame kernel is controllable mill dislocation pulverized coal channel arragement construction |
| CN109668144A (en) * | 2018-11-21 | 2019-04-23 | 大唐东北电力试验研究院有限公司 | A kind of combustion system optimized and revised for the wide load steam temperature of circle of contact pulverized-coal fired boiler |
| CN109668144B (en) * | 2018-11-21 | 2020-09-18 | 大唐东北电力试验研究院有限公司 | Combustion system for optimizing and adjusting wide-load steam temperature of tangential pulverized coal fired boiler |
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| 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 |
| 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 |
| 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 |
| CN112555819A (en) * | 2020-11-18 | 2021-03-26 | 哈尔滨锅炉厂有限责任公司 | Tangential combustor arrangement mode for ultralow-load flexible peak regulation of boiler |
| CN112555819B (en) * | 2020-11-18 | 2022-12-23 | 哈尔滨锅炉厂有限责任公司 | Tangential combustor arrangement mode for ultralow-load flexible peak regulation of boiler |
| CN113280360A (en) * | 2021-06-25 | 2021-08-20 | 西安热工研究院有限公司 | Coal mill operation method suitable for deep peak shaving of boiler |
| CN113513767A (en) * | 2021-07-19 | 2021-10-19 | 国网天津市电力公司电力科学研究院 | Switching and stable combustion device and method for coal mill of deep peak shaving coal-fired unit |
| CN114413278A (en) * | 2022-01-04 | 2022-04-29 | 华北电力科学研究院有限责任公司 | Method for determining highest oxygen concentration of primary air, and low-load stable combustion method and system of pulverized coal boiler |
| CN114413278B (en) * | 2022-01-04 | 2024-04-19 | 华北电力科学研究院有限责任公司 | Method for determining highest oxygen concentration of primary air, low-load stable combustion method and system of pulverized coal boiler |
| CN116608461A (en) * | 2023-06-25 | 2023-08-18 | 北京天地融创科技股份有限公司 | Combustion system and boiler system with same |
| CN116608461B (en) * | 2023-06-25 | 2024-06-11 | 北京天地融创科技股份有限公司 | Combustion system and boiler system with same |
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