CN107238075A - A kind of coal burning boiler of power station mixed coal combustion method - Google Patents
A kind of coal burning boiler of power station mixed coal combustion method Download PDFInfo
- Publication number
- CN107238075A CN107238075A CN201710576115.9A CN201710576115A CN107238075A CN 107238075 A CN107238075 A CN 107238075A CN 201710576115 A CN201710576115 A CN 201710576115A CN 107238075 A CN107238075 A CN 107238075A
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- coal
- stove
- layer
- power station
- air nozzle
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Classifications
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- 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
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- 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
- F23C2700/00—Special arrangements for combustion apparatus using fluent fuel
- F23C2700/06—Combustion apparatus using pulverized fuel
- F23C2700/063—Arrangements for igniting, flame-guiding, air supply in
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
- F23K2201/1006—Mills adapted for use with furnaces
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- 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 coal burning boiler of power station mixed coal combustion method, belongs to technical field of boiler combustion, its object is to combine the respective advantage that " in stove " and " outside stove " is blended, improves fire retardant coal and Coal Blends Ignition and burnout characteristic.The present invention is provided with both sides above and below N layers of First air nozzle, every layer of First air nozzle in coal burning boiler of power station furnace wall and is provided with 1~3 layer of overfire air jet from top to bottom, and the superiors' overfire air jet top is provided with 1~3 layer of burnout degree nozzle；Feeding coal pulverizer wears into coal dust after fire retardant coal and inflammable briquette mixing, is sent into by the superiors' First air nozzle in stove；Inflammable briquette wears into coal dust by coal pulverizer, is sent into by 1 layer of First air nozzle of remaining N in stove.The present invention blends many coals for coal-burning power plant, both takes full advantage of the efficient low NO that " in stove " blends combustion systemxAdvantage, combine again " outside stove " blending combustion system be conducive to fire retardant coal catch fire and after-flame advantage, can be achieved that boiler is stable, efficient, safe and environment-friendly, economical operation.
Description
Technical field
The invention belongs to technical field of boiler combustion, and in particular to a kind of coal burning boiler of power station mixed coal combustion method.
Background technology
With the rapid development of the national economy, the energy-consuming of China is growing, it has also become world energy sources consumes big country.
In the primary energy total quantity consumed of China, consumption of coal is in absolute predominance, constitutes about the 75% of total energy consumption.Electric power
Industry is the important component of energy industry, is the important foundation of promotion and support socio-economic development.The annual coal of China
More than the 50% of total quantity consumed is used for thermal power generation, and thermal power generation accounts for 80% or so of generating total amount, still occupies leading position,
It can be seen that the consumption of coal of China's power industry is huge.But, the current installed capacity per capita of China and per capita electricity are all
In world's subaverage, power industry needs further development, because resource situation determines that China is the energy based on coal
Source structure, develops limited today in unconventional energy resource, power generation is still based on coal fired power generation.As can be seen here, China's electricity
Power demand increases year by year, certainly will cause coal consumption increase, coal resources dog-eat-dog；But China's coal-burning power plant's energy profit
Not high with rate, energy loss is serious, and net coal consumption rate is compared still with World Developed Countries level larger gap, meanwhile, also exist
Coal-fired NOx、SO2、CO2, the pollutant discharge amount such as dust it is big, administering pressure and the big grade of cost, some arrange urgently to be resolved hurrily important ask
Topic.
Coal resources in China is limited and skewness.With the development of national economy continuously and healthily, electric coal usage amount continues
Increase.But, because coal price persistently rises, high and coal transport power is not enough, and numerous Thermal Power Enterprises are difficult to use design coal.Coal
Many, the coal source of kind is miscellaneous, the poor basic situation as China's electricity coal supply of ature of coal so that many coals of thermal power generation corporations turn into
Inevitable choice under current situation.Under the conditions of complicated coal, boiler often exists during many coals：Multifuel combustion mistake
The four major problems such as Cheng Guanlian complexity, the increase of the more aobvious protrusion of safety problem, economical operation difficulty and the exacerbation of pollution control task.Typically
In fact, during Blended Coal Combustion, if coal selection is appropriate, it is well mixed, reasonable mixture ratio, creates good burning condition, play component
The respective superiority of coal, makes up the defect of single coal own combustion characteristic, learns from other's strong points to offset one's weaknesses, safety and economy to boiler
Bring desirable influence.Although mixed coal is a simple mechanical mixture process, but the composition due to Coal rank and burning spy
Property it is different, when mixing burning can not possibly while meet the burning condition of blending coal, if therefore mixed coal configuration is improper, burning can be caused to set
Standby operation level declines, combustion instability, efficiency reduction, the aggravation of slagging dust stratification, or even causes boiler extinguishment blowing out accident.When
Before, stability, efficiency of combustion, burner hearth Serious Slagging and the SO of the burning that Blended Coal Combustion is primarily uponxDischarge.
Existing mixed coal combustion mode is broadly divided into two kinds, and one kind is " being blended in stove ", and one kind is " being blended outside stove "." stove
Interior blending " is as shown in figure 1, the furnace wall of coal burning boiler of power station 1 is provided with N layers of First air nozzle 2, every layer of First air nozzle from top to bottom
About 2 both sides are provided with 1~3 layer of overfire air jet 3, and the superiors' overfire air jet top is provided with 1~3 layer of burnout degree nozzle
4, it is coal dust that fire retardant coal 6 sends into the different mills of coal pulverizer 5 from inflammable briquette 7, is sent into afterwards by different layers First air nozzle 2 in stove simultaneously
The mixed combustion of different coal dusts is realized in stove." outside stove blend " as shown in Fig. 2 refer to fire retardant coal 6 and inflammable briquette 7 in advance according to
Certain proportion mixes feeding coal pulverizer 5 and ground as coal dust, then passes through different layers First air nozzle 2 and sends into stove and burns.Two
Kind, which mixes burning mode, respectively advantage and disadvantage, for example, when fire retardant coal is mixed with inflammable briquette, being blended under " being blended outside stove ", in fire retardant coal certain
The inflammable briquette of ratio can effectively improve catching fire and burnout characteristic for fire retardant coal；And " being blended in stove " is advantageously implemented the efficient of mixed coal
Low NOxThe purpose of burning.With reference to the advantage of both combustion methods, to reach coal dust it is efficient, stably, safely, low NOxCombustion
The purpose of burning, has very high social value and economic value to the coal adaptability of boiler.
The content of the invention
The present invention provides a kind of coal burning boiler of power station mixed coal combustion method, is mixed its object is to combination " in stove " with " outside stove "
Mixed respective advantage, improves fire retardant coal and Coal Blends Ignition and burnout characteristic, with reach mixed coal surely fire, efficient, low NOxBurning.
A kind of coal burning boiler of power station mixed coal combustion method provided by the present invention, the coal burning boiler of power station furnace wall from upper and
It is arranged with both sides above and below N layers of First air nozzle, 3≤N≤10, every layer of First air nozzle and is provided with 1~3 layer of Secondary Air spray
Mouth, the superiors' overfire air jet top is provided with 1~3 layer of burnout degree nozzle, it is characterised in that：
Inflammable briquette is blended in fire retardant coal, feeding coal pulverizer wears into coal dust after both mix, and is sprayed by the superiors' First air
In mouth feeding stove；
Inflammable briquette is worn into coal dust by coal pulverizer, sent into by remaining N-1 layers of First air nozzle in stove.
Described coal burning boiler of power station mixed coal combustion method, it is characterised in that：
The mass percent that the inflammable briquette blended in fire retardant coal accounts for Mixture Density Networks is 10%~25%.
Set each layer First air nozzle, each layer overfire air jet and each layer after-flame on the coal burning boiler of power station furnace wall
Wind nozzle, in every layer, all kinds of nozzles are distributed along furnace wall rectangular cross section corner or front-back wall (opposite side).
Inflammable briquette is caught fire and burnout characteristic is preferable, and inflammable briquette is sent into stove separately through middle lower floor's First air nozzle.It is difficult
Fire coal catches fire and burnout characteristic is poor, to improve the after-flame performance of fire retardant coal, and blending accounts for Mixture Density Networks quality percentage in fire retardant coal
Inflammable briquette than 10%~25%, both are sent into stove by the superiors' First air nozzle after mixing, both taken full advantage of in stove
Mixing burning is conducive to mixed coal to realize efficiently low NOxAdvantage, combine again and burning is mixed outside stove be conducive to fire retardant coal to catch fire steady combustion and after-flame
Advantage, can effectively improve mixed coal overall burnout characteristic and reduction NOxDischarge.The present invention mixes available for coal-burning power plant's mixed coal
Burn, when particularly mixing the big difference coal of burning, realize that boiler is stable, safe and environment-friendly, economical operation.
The ratio of inflammable briquette blending is controlled within 25%, blending inflammable briquette is more than 25%, the burning pair that tacks of inflammable briquette
The after-flame influence of fire retardant coal is larger, is unfavorable for mixed coal after-flame；The flame stabilization that fire retardant coal is not only improved less than 25% is conducive to again
The after-flame of mixed coal.
Brief description of the drawings
Fig. 1 is " in stove " blending combustion system schematic diagram；
Fig. 2 is " outside stove " blending combustion system schematic diagram；
Fig. 3 is the blending combustion method schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in more detail.
As shown in figure 3, embodiments of the invention, the furnace wall of coal burning boiler of power station 1 is provided with 4 layers of First air nozzle from top to bottom
2, every layer of First air nozzle is provided with 1 layer of overfire air jet 3 in both sides about 2, and the superiors' overfire air jet top is provided with 1 layer
Burnout degree nozzle 4,
Inflammable briquette 7 is blended in fire retardant coal 6, feeding coal pulverizer 5 wears into coal dust after both mix, and passes through the superiors' First air
In the feeding stove of nozzle 4.
Inflammable briquette 7 is worn into coal dust by coal pulverizer 5, sent into by remaining 3 layers of First air nozzle 4 in stove.
In the present embodiment, the mass percent that the inflammable briquette blended in fire retardant coal accounts for Mixture Density Networks is 25%.
Claims (2)
1. a kind of coal burning boiler of power station mixed coal combustion method, the coal burning boiler of power station furnace wall is provided with N layers once from top to bottom
Both sides are provided with 1~3 layer of overfire air jet, the superiors' Secondary Air spray above and below wind nozzle, 3≤N≤10, every layer of First air nozzle
Mouth top is provided with 1~3 layer of burnout degree nozzle, it is characterised in that：
Inflammable briquette is blended in fire retardant coal, feeding coal pulverizer wears into coal dust after both mix, and is sent by the superiors' First air nozzle
Enter in stove；
Inflammable briquette is worn into coal dust by coal pulverizer, sent into by remaining N-1 layers of First air nozzle in stove.
2. coal burning boiler of power station mixed coal combustion method as claimed in claim 1, it is characterised in that：
The mass percent that the inflammable briquette blended in fire retardant coal accounts for Mixture Density Networks is 10%~25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710576115.9A CN107238075A (en) | 2017-07-14 | 2017-07-14 | A kind of coal burning boiler of power station mixed coal combustion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710576115.9A CN107238075A (en) | 2017-07-14 | 2017-07-14 | A kind of coal burning boiler of power station mixed coal combustion method |
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| Publication Number | Publication Date |
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| CN107238075A true CN107238075A (en) | 2017-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710576115.9A Pending CN107238075A (en) | 2017-07-14 | 2017-07-14 | A kind of coal burning boiler of power station mixed coal combustion method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404955A (en) * | 2018-10-11 | 2019-03-01 | 大唐甘肃发电有限公司八〇三热电厂 | A kind of coal mixing combustion method reducing boiler scaling |
| CN112696657A (en) * | 2020-12-01 | 2021-04-23 | 北方联合电力有限责任公司包头第一热电厂 | Boiler blowing-out control system |
| CN113654075A (en) * | 2021-07-06 | 2021-11-16 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Method and device for predicting lignite blending combustion ratio of coal-fired boiler |
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| JP2005291524A (en) * | 2004-03-31 | 2005-10-20 | Babcock Hitachi Kk | Combustion equipment and method of biomass fuel |
| CN1807985A (en) * | 2004-11-04 | 2006-07-26 | 巴布考克日立株式会社 | Overfiring air port, method for manufacturing air port, boiler, boiler facility, method for operating boiler facility and method for improving boiler facility |
| CN104180365A (en) * | 2014-08-29 | 2014-12-03 | 国家电网公司 | Blending combustion method of W-flame boiler using large-difference coal types |
| CN104749315A (en) * | 2015-02-13 | 2015-07-01 | 华中科技大学 | Carbon-containing solid fuel mixed combustion test device and method |
| CN105987378A (en) * | 2015-02-12 | 2016-10-05 | 清华大学 | Method and device for fuel pyrolysis and co-combustion for preventing and controlling soot formation and coking of low-rank coal |
-
2017
- 2017-07-14 CN CN201710576115.9A patent/CN107238075A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005291524A (en) * | 2004-03-31 | 2005-10-20 | Babcock Hitachi Kk | Combustion equipment and method of biomass fuel |
| CN1807985A (en) * | 2004-11-04 | 2006-07-26 | 巴布考克日立株式会社 | Overfiring air port, method for manufacturing air port, boiler, boiler facility, method for operating boiler facility and method for improving boiler facility |
| CN104180365A (en) * | 2014-08-29 | 2014-12-03 | 国家电网公司 | Blending combustion method of W-flame boiler using large-difference coal types |
| CN105987378A (en) * | 2015-02-12 | 2016-10-05 | 清华大学 | Method and device for fuel pyrolysis and co-combustion for preventing and controlling soot formation and coking of low-rank coal |
| CN104749315A (en) * | 2015-02-13 | 2015-07-01 | 华中科技大学 | Carbon-containing solid fuel mixed combustion test device and method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404955A (en) * | 2018-10-11 | 2019-03-01 | 大唐甘肃发电有限公司八〇三热电厂 | A kind of coal mixing combustion method reducing boiler scaling |
| CN112696657A (en) * | 2020-12-01 | 2021-04-23 | 北方联合电力有限责任公司包头第一热电厂 | Boiler blowing-out control system |
| CN113654075A (en) * | 2021-07-06 | 2021-11-16 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Method and device for predicting lignite blending combustion ratio of coal-fired boiler |
| CN113654075B (en) * | 2021-07-06 | 2024-03-26 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Method and device for predicting lignite blending combustion proportion of coal-fired boiler |
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Application publication date: 20171010 |