CN108151008B - A kind of mixed combustion system and method for power boiler low NOx of high-temperature flue gas preheating semicoke - Google Patents
A kind of mixed combustion system and method for power boiler low NOx of high-temperature flue gas preheating semicoke Download PDFInfo
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- CN108151008B CN108151008B CN201711149419.3A CN201711149419A CN108151008B CN 108151008 B CN108151008 B CN 108151008B CN 201711149419 A CN201711149419 A CN 201711149419A CN 108151008 B CN108151008 B CN 108151008B
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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
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
- F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
A kind of low NO of station boiler of high-temperature flue gas preheating semicokexMixed combustion system and method.Using preheating pipe and the pre- heat separator of whirlwind, semicoke is directly preheated by high-temperature flue gas, significantly improve temperature when semicoke sprays into burner hearth, lower furnace portion is provided with the stable ignition area of bituminous coal combustion simultaneously, convenient for the kindling and steady combustion of ultralow half coke fuel of volatile matter, it realizes station boiler large scale (>=45%) and mixes and burn half coke fuel, while semicoke preheating, output has the pre- hot compared with strong reducing property, pre- hot is injected directly into the middle part of burner hearth by burner, forms NO on preheating coal-char combustion area topxReducing zone greatly reduces NOxDischarge amount, effectively realize the low NO of ultralow volatile matter carbon-based fuelxBurning.Furnace combustion zone top sprays into air or pure oxygen burnout degree, guarantees the completely burned of fuel, can effectively reduce unburned carbon in flue dust and NOxDischarge amount.
Description
Technical field
The present invention relates to a kind of mixed combustion system and method for station boiler, in particular to a kind of electricity of high-temperature flue gas preheating semicoke
The low NO of boiler of standingxMixed combustion system and method.
Background technique
Coal cascade utilization is one of the important channel that Coal Clean efficiently utilizes.Pyrolysis of coal and gasification byproduct semicoke and
Carbon residue is the important component for realizing the efficient cascade utilization of Coal Clean as high-grade clean fuel combustion power generation.Semicoke
It is consolidating for the high-volatile bituminous coal relatively low volatile that carbonization obtains under middle cryogenic conditions of no adhesion or weak caking property
Body carbonaceous product.China's low order coal reserves accounts for about the 42% of coal proved reserves close to 500,000,000,000 tons, this is a kind of degree of coalification
Lower coal.The staged conversion of low-order coal, which refers to, extracts oil gas by pyrolysis or gasification for coal, and remaining semicoke or carbon residue are made
For the coal utilization mode of high-grade clean fuel combustion power generation.With the development of China's low-order coal staged conversion industry, coal gas
Change, the industries such as coke processed will generate several hundred million tons of semicokes, carbon residues every year.There are this large amount of class A fuel A urgently to realize that burning utilizes at present.And
Semicoke is a kind of feasible solution in the safe and efficient utilization of power plant fuel area.But the volatile matter of semicoke and carbon residue
Content is very low, belongs to ultralow volatile matter carbon-based fuel, realizes that clean and effective burning is difficult, and it is tired usually to there is the steady combustion of kindling
It is difficult, burn-off rate is low, NOxDischarge the problems such as high.Therefore, the clean and effective burning of such ultralow volatile matter carbon-based fuel how is realized
It utilizes, it has also become restrict the key technology bottleneck of coal in China clean and effective cascade utilization industrial application, and urgently to be resolved.
Semicoke and this kind of ultralow volatile matter carbon-based fuel of carbon residue, using traditional combustion technology, exist the steady combustion of kindling it is difficult,
The problem that burn-up efficiency is low, discharged nitrous oxides are high.Realize that the clean and effective burning of this class A fuel A utilizes, it has also become restrict China
The key technology bottleneck of low-order coal staged conversion.Country's station boiler mixes the fuel mixing ratio of semicoke in the commerical test for burning semicoke at present
Example is not high, and only 30% or so.The country in 2014, Xi'an thermal technology institute is for the first time in milky way power plant 135MW unit plant pulverized-coal fired boiler
On realize bituminous coal unit safety stablize mix burn 33% ratio semi-coke, 2015 in power plant, Shen Wan energy Chizhou City 2 × 320MW machine
Safety and stability is realized on group Lean Coal-fired Boiler and is mixed and burns 30% ratio semi-coke, but finds that boiler efficiency decreases.Low mixed-fuel burning proportion
It cannot achieve the extensive utilization of ultralow half coke fuel of volatile matter, therefore improve the mixed-fuel burning proportion of semicoke in station boiler, realize
Large scale (>=45%) mixes burning semicoke in power plant's operation, is the base realizing ultralow volatile matter carbon-based fuel clean and effective and utilizing
Plinth.
Summary of the invention
It may be implemented in large scale in station boiler the purpose of the present invention is to provide one kind and mix burning semicoke, while utilizing preheating
The strong reduction characteristic and air deep-graded of product can be formed with conducive to NOxThe reducing zone of reduction is expected to solve nitrogen oxides row
Put the low NO of station boiler of the high-temperature flue gas preheating semicoke of high problemxMixed combustion system and method.
In order to achieve the above objectives, system of the invention includes boiler body and arranges the kindling in its burner hearth from bottom to top
Area, preheating coal-char combustion area, the burning of pre- hot and NOXReducing zone and burning-out zone are also pacified in the back-end ductwork of boiler body
Equipped with air preheater, bituminous coal is connected by bituminous coal feeder, bituminous coal coal pulverizer with the bituminous coal combustion device of ignition zone entrance, semicoke
It is sent into pulverized coal bin by semicoke feeder, semicoke coal pulverizer, pulverized coal bin is through coal, pulverulent fuel mixer, preheating pipe and the pre- thermal release of whirlwind
Device is connected, and the semicoke air and powder mixer being connected with First air is also equipped in the pre- heat separator lower end of whirlwind, by air preheater
The First air of output is sent into bituminous coal coal pulverizer and semicoke coal pulverizer through pipeline, the high-temperature flue gas and one extracted by boiler horizontal gas pass
Mixed flue gas after secondary wind proportion is sent into coal, pulverulent fuel mixer by the road, and the semicoke that the pre- heat separator of whirlwind is isolated is through semicoke wind powder
Mixer is connected with the preheating coal-char combustion device of preheating coal-char combustion area entrance, and the carrying that the pre- heat separator of whirlwind is isolated is a small amount of
Ultra-fine semicoke and preheating gas and the burning of pre- hot and NOXThe pre- hot burner of reducing zone entrance is connected, air or pure
Oxygen burnout degree is connected with the burnout degree nozzle of burning-out zone entrance.
The high-temperature flue gas of the boiler horizontal gas pass is extracted by blower resistant to high temperature, which is one or several string
The blower of parallel way connection.
Flue-gas temperature after high-temperature flue gas and the First air proportion that the boiler horizontal gas pass extracts is 700~800 DEG C.
The temperature of the high-temperature flue gas of the extraction is adjusted by choosing fume extraction position.
The preheating pipe uses horizontal and vertical pipeline combination to extend duct length.
The pre- heat separator of the whirlwind is using multiple cyclone separators in parallel or series.
Water-cooling system is provided on the pre- heat separator of the whirlwind and preheating pipe.
The low NO of station boiler of high-temperature flue gas preheating semicoke of the inventionxMixed burning method is as follows:
1) bituminous coal and semicoke are using the method for dividing powder-grinding, and wherein the inflammable bituminous coal of high volatile is ground through bituminous coal coal pulverizer
Afterwards, thicker pulverized bituminous coal is obtained, introduces ignition zone from lower furnace portion, half coke fuel uses bin storage type pulverizing system, leads to
Cross semicoke coal pulverizer and carry out powder processed, obtain thinner semicoke coal dust and be stored in pulverized coal bin, after by coal, pulverulent fuel mixer, economizer bank
Behind road and whirlwind smoke pre-heating separator, formed preheating semicoke and preheating produce gas classification spray into burner hearth preheating coal-char combustion area and
Pre- hot burning and NOXReducing zone；
2) high-temperature flue gas is extracted from boiler horizontal gas pass and is sent into adjustment flue-gas temperature and oxygen content after heat primary air proportion
Coal, pulverulent fuel mixer, preheated pipeline heat the half pre- heat separator of defocused feeding whirlwind, and the two is abundant in the pre- heat separator of whirlwind
Mixing, after carrying out heat exchange and partial gasification reaction, the separation stronger pre- hot of output reproducibility carries a small amount of ultra-fine
Semicoke be sent into the burning of pre- hot and NOXReducing zone, high-temperature semi-coke are sent into preheating coal-char combustion area；
3) after being preheated by the pulverized bituminous coal that bituminous coal coal pulverizer is ground by First air be sent into lower furnace portion ignition zone with it is secondary
After wind mixes strongly, initial ignition zone is formed, generates and contains a certain concentration NOxFlue gas, excess air coefficient α be 0.6
~0.95；
4) preheating semicoke is sent into the preheating coal-char combustion area of burner hearth by heat primary air by semicoke air and powder mixer, passes through one
Secondary Air proportion adjusts this region excess air coefficient α < 1, forms fuel-rich combustion, reduces NOxGeneration
5) preheating of whirlwind pre- heat separator produce gas and a small amount of ultra-fine semicoke spray into upper furnace the burning of pre- hot and
NOxReducing zone, this region activation semicoke uncombusted containing part simultaneously form the pre- hot having compared with strong reducing property atmosphere
Combustion zone；
6) select air or pure oxygen as burnout degree, the after-flame by upper furnace is arranged in divides spout to be sent into burner hearth, makes to fire
Material reaches completely burned in excess air coefficient α > 1.
Effect of the invention is embodied in:
1) the station boiler system uses preheating pipe and the pre- heat separator of whirlwind, and half is directly preheated by high-temperature flue gas
Coke significantly improves temperature when semicoke sprays into burner hearth, while lower furnace portion is provided with the ignition zone of bituminous coal combustion, for igniting
Half coke fuel of ultralow volatile matter is realized station boiler large scale and mixed and burn half coke fuel, overcome and burnt using conventional method
The problems such as existing kindling is unstable when semicoke, and burn-up efficiency is low ensure that the kindling, steady combustion and after-flame of semicoke, it can be achieved that half
The extensive effective use of burnt this kind of ultralow volatile matter carbon-based fuel.
2) for this system while semicoke preheats, output has the pre- hot compared with strong reducing property, and pre- hot is by burner
It is injected directly into the middle part of burner hearth, forms NO on preheating coal-char combustion area topxReducing zone greatly reduces NOxDischarge amount, have
Effect realizes the low NO of ultralow volatile matter carbon-based fuelxBurning.The proportion adjustment flue-gas temperature of air and flue gas can also be passed through
And oxygen content reaches and coal and actual operating mode to change the preheating gas ingredient of the pre- heat separator output of whirlwind
The purpose matched.
3) furnace combustion zone top sprays into air and pure oxygen burnout degree, guarantees the completely burned of fuel, can effectively reduce winged
Grey phosphorus content and NOxDischarge amount.
4) high-temperature flue gas pre-heating system method is simple and effective, also simplifies the transformation that processing is used for service power plant, only need to be in original
Circulating fan and the pre- heat separator of whirlwind are added in system to achieve the goal.
5) it is directed to semicoke and the biggish fuel of two species diversity of bituminous coal, which uses the progress of different coal pulverizers
Powder processed, it can be achieved that two kinds of fineness fuel powder, save pulverizer capacity, semicoke conveyance conduit and burner can effectively carry out spy
Different abrasionproof processing, semicoke and powdering system of bituminous coal use different medium temperatures.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention.
1 is boiler body in figure, and 2 be air preheater, and 3 pressure fan, 4 be semicoke feeder, and 5 be coal pulverizer, and 6 be coal
Powder cabin, 7 be circulating fan, and 8 be tobacco powder mixer, and 9 be preheating pipe, and 10 be the pre- heat separator of whirlwind, and 11 is mixed for semicoke wind powder
Clutch, 12 be bituminous coal feeder, and 13 be bituminous coal coal pulverizer, and 14 be bituminous coal combustion device, and 15 be preheating coal-char combustion device, and 16 be pre-
Hot burner, 17 be burnout degree nozzle, and 18 be primary air fan.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing.
Referring to Fig. 1, the present invention includes boiler body 1 and arranges ignition zone, the preheating semicoke in its burner hearth from bottom to top
Combustion zone, the burning of pre- hot and NOXReducing zone and burning-out zone, it is pre- in the back-end ductwork of boiler body 1 to be also equipped with air
Hot device 2, bituminous coal are connected by bituminous coal feeder 12, bituminous coal coal pulverizer 13 with the bituminous coal combustion device 14 of ignition zone entrance, and semicoke is logical
Semicoke feeder 4, the feeding pulverized coal bin 6 of semicoke coal pulverizer 5 are crossed, pulverized coal bin 6 is preheated through coal, pulverulent fuel mixer 8, preheating pipe 9 and whirlwind
Separator 10 is connected, and the semicoke air and powder mixer 11 being connected with First air is also equipped in the pre- heat separator lower end of whirlwind, by sky
The First air that air preheater 2 exports is sent into bituminous coal coal pulverizer 13 and semicoke coal pulverizer 5 through pipeline, is extracted by boiler horizontal gas pass
Mixed flue gas after high-temperature flue gas and First air proportion is sent into coal, pulverulent fuel mixer 8 by the road, and the pre- heat separator 10 of whirlwind is isolated
Semicoke through semicoke air and powder mixer 11 with preheating coal-char combustion area entrance preheating coal-char combustion device 15 be connected, whirlwind preheat
The carrying that separator 10 is isolated ultra-fine semicoke and preheating gas and pre- hot is burnt and NO on a small quantityXThe preheating of reducing zone entrance
Product burner 16 is connected, and air or pure oxygen burnout degree are connected with the burnout degree nozzle 17 of burning-out zone entrance.
The biggish fuel of two species diversity of bituminous coal and semicoke of the present invention chooses different coal pulverizers using the method for dividing powder-grinding
Powder processed is carried out respectively, by adjusting device parameter and operating parameter, obtains the coal dust of different fineness；
The high-temperature flue gas of boiler horizontal gas pass is extracted by blower resistant to high temperature, which is one or several series-parallel side
Formula connection blower, thus provide meet system needed for flue gas flow and pressure；
Flue-gas temperature after high-temperature flue gas and the First air proportion that boiler horizontal gas pass extracts is 700~800 DEG C, this temperature
Range is conducive to the activation of semicoke, inhibits NOxGeneration, while can guarantee that semicoke reaches certain preheating temperature, while appropriate
Oxygen content guarantee that part gasification reaction occurs for semicoke and high-temperature flue gas；
The temperature of the high-temperature flue gas extracted in actual motion can according to the coal powder performance of specific operating parameter and semicoke,
The temperature of the high-temperature flue gas of extraction is adjusted by choosing fume extraction position；
Mixed flue gas adjusts the temperature of mixed flue gas by choosing many places fume extraction position；
9 preheating pipe of preheating pipe can design duct length as needed, and the present invention is combined using horizontal and vertical pipeline
To extend duct length；
The pre- heat separator of whirlwind can be according to actual operation parameters using multiple cyclone separators in parallel and serial；
It is provided with water-cooling system on the pre- heat separator 10 of whirlwind and preheating pipe 9 and guarantees that equipment works normally；
Ignition zone, which generates, contains a certain concentration NOxFlue gas, excess air coefficient α be 0.6~0.95, one's respective area is used for
Stable burning condition is established, convenient for the kindling and steady combustion of half coke fuel.The preheating semicoke of higher temperature is passed through by heat primary air
Burner nozzle is sent into burner hearth middle and lower part, and due to semicoke temperature with higher after warming, and there are high volatiles for lower layer
Bituminous coal combustion area, preheat the rapid ignition of semicoke, pass through a Secondary Air and match adjustment region excess air coefficient, formed rich
Fuel combustion reduces NOxGeneration.Preheating produces gas and a small amount of ultra-fine semicoke sprays into upper furnace, and portion is contained in this region simultaneously
Divide uncombusted activation semicoke, forms with the pre- hot combustion zone compared with strong reducing property atmosphere.And it preheats and produces gas by high temperature
Flue gas and gasification produce gas composition, and containing a large amount of reproducibility groups, while ultra-fine semicoke reproducibility is stronger, therefore pre- hot has
Stronger reproducibility, the NO in flue gasxIt is largely restored in this region, can effectively reduce NOxProduction quantity.Finally, on burner hearth
Portion sprays into air or pure oxygen burnout degree, realizes that unburned ingredient reaches completely burned under conditions of excess air coefficient α > 1, simultaneously
Reduce thermal NOxGeneration, burnout degree introduces burner hearth with relatively high speed, strengthens the heat transfer of burnout degree and main flume
Mass transfer.
The method comprise the steps that
1) bituminous coal and semicoke are using the method for dividing powder-grinding, and wherein the inflammable bituminous coal of high volatile is through bituminous coal coal pulverizer 13
After grinding, thicker pulverized bituminous coal is obtained, introduces ignition zone from lower furnace portion, half coke fuel uses intermediate warehouse formula powder system
System, powder processed is carried out by semicoke coal pulverizer 5, thinner semicoke coal dust is obtained and is stored in pulverized coal bin 6, after by coal, pulverulent fuel mixer
8, it after preheating pipe 9 and whirlwind smoke pre-heating separator, forms preheating semicoke and preheating produces the preheating half that gas classification sprays into burner hearth
Burnt combustion zone and the burning of pre- hot and NOxReducing zone；
2) high-temperature flue gas is extracted from boiler horizontal gas pass and is sent into adjustment flue-gas temperature and oxygen content after heat primary air proportion
Coal, pulverulent fuel mixer 8, preheated pipeline 9 heat the half defocused pre- heat separator 10 of feeding whirlwind, and the two is in the pre- heat separator 10 of whirlwind
It is inside sufficiently mixed, after carrying out heat exchange and partial gasification reaction, the separation stronger pre- hot of output reproducibility carries few
It measures ultra-fine semicoke and is sent into pre- hot burning and NOxReducing zone, high-temperature semi-coke are sent into preheating coal-char combustion area；
3) ignition zone and two of lower furnace portion is sent into after being preheated by the pulverized bituminous coal that bituminous coal coal pulverizer 13 is ground by First air
After secondary wind mixes strongly, initial ignition zone is formed, generates and contains a certain concentration NOxFlue gas, excess air coefficient α is
0.6~0.95；
4) preheating semicoke is sent into the preheating coal-char combustion area of burner hearth by heat primary air by semicoke air and powder mixer 11, is passed through
One Secondary Air proportion adjusts this region excess air coefficient α < 1, forms fuel-rich combustion, reduces NOxGeneration 5) whirlwind is pre-
The preheating of heat separator 10 produces gas and a small amount of ultra-fine semicoke sprays into the burning of pre- hot and the NO of upper furnacexReducing zone, this area
Domain activation semicoke uncombusted containing part simultaneously forms the pre- hot combustion zone having compared with strong reducing property atmosphere；
6) select air or pure oxygen as burnout degree, the after-flame by upper furnace is arranged in divides spout to be sent into burner hearth, makes to fire
Material reaches completely burned in excess air coefficient α > 1.
Air is sent into the air preheater 2 for being mounted on 1 tail portion of boiler body by pressure fan 3 and primary air fan 18, passes through
After heating, First air and Secondary Air are obtained.Bituminous coal is sent into bituminous coal coal pulverizer 13 by feeder 12, while First air and air close
Bituminous coal coal pulverizer is also passed into after reason proportion, pulverized bituminous coal obtained is sent into burner hearth lowest part, forms initial ignition zone, establishes and stablizes
Burning condition is conducive to kindling and the after-flame of half coke fuel.Half coke fuel of ultralow volatile matter is sent into half by semicoke feeder 4
Burnt coal pulverizer 5, coal dust obtained is sent into pulverized coal bin 6 and is stored after grinding, while from boiler horizontal gas pass extracting high-temperature flue gas
After suitably being matched with First air, conveyed by circulating fan 7, it is suitable by length after being mixed in tobacco powder mixer 8 with semicoke
When preheating pipe 9 after, be sent into the pre- heat separator 10 of whirlwind；In the pre- heat separator 10 of whirlwind and preheating pipe 9, flue gas and
Semicoke blends strongly, occurs heat transfer and partial gasification reaction, the preheating semicoke of isolated higher temperature and has relatively strong
The pre- hot of reproducibility；Preheating semicoke is conveyed by heat primary air, via air and powder mixer 11, sprays into burner hearth by burner 15
Middle part preheats coal-char combustion area；Preheating produces gas and carries a small amount of ultra-fine semicoke coal dust, is sent into preheating semicoke combustion by burner 16
It burns area's upper area to burn, since preheating gas has stronger reproducibility, is conducive to what bituminous coal and coal-char combustion generated
NOxReduction, NO is formd in the middle part of burner hearthxReducing zone.Air or pure oxygen are made by the feeding upper furnace of burnout degree nozzle 17
The fuel such as uncombusted semicoke burn away, and form burning-out zone.
Claims (8)
1. a kind of low NO of station boiler of high-temperature flue gas preheating semicokexMixed combustion system, including boiler body (1) and from bottom to top
Arrange ignition zone, preheating coal-char combustion area, the burning of pre- hot and the NO in its burner hearthXReducing zone and burning-out zone, in boiler sheet
It is also equipped in the back-end ductwork of body (1) air preheater (2), bituminous coal passes through bituminous coal feeder (12), bituminous coal coal pulverizer (13)
It is connected with the bituminous coal combustion device (14) of ignition zone entrance, it is characterised in that: semicoke passes through semicoke feeder (4), semicoke coal pulverizer
(5) pulverized coal bin (6) are sent into, pulverized coal bin (6) is through coal, pulverulent fuel mixer (8), preheating pipe (9) and the pre- heat separator of whirlwind (10) phase
Even, the semicoke air and powder mixer (11) being connected with First air is also equipped in the pre- heat separator lower end of whirlwind, by air preheater
(2) First air exported is sent into bituminous coal coal pulverizer (13) and semicoke coal pulverizer (5) through pipeline, the height extracted by boiler horizontal gas pass
Mixed flue gas after warm flue gas and First air proportion is sent into coal, pulverulent fuel mixer (8) by the road, the pre- heat separator of whirlwind (10) separation
Semicoke out is connected through semicoke air and powder mixer (11) with the preheating coal-char combustion device (15) of preheating coal-char combustion area entrance, whirlwind
The carrying that pre- heat separator (10) is isolated ultra-fine semicoke and preheating gas and pre- hot is burnt and NO on a small quantityxReducing zone entrance
Pre- hot burner (16) be connected, air or pure oxygen burnout degree are connected with the burnout degree nozzle (17) of burning-out zone entrance.
2. the low NO of station boiler of high-temperature flue gas preheating semicoke according to claim 1xMixed combustion system, it is characterised in that: institute
The high-temperature flue gas for the boiler horizontal gas pass stated is extracted by blower resistant to high temperature, which is one or several series-parallel systems connect
The blower connect.
3. the low NO of station boiler of high-temperature flue gas preheating semicoke according to claim 1xMixed combustion system, it is characterised in that: institute
Flue-gas temperature after high-temperature flue gas and the First air proportion that the boiler horizontal gas pass stated extracts is 700~800 DEG C.
4. the low NO of station boiler of high-temperature flue gas preheating semicoke according to claim 1xMixed combustion system, it is characterised in that: institute
The temperature of the high-temperature flue gas for the extraction stated is adjusted by choosing fume extraction position.
5. the low NO of station boiler of high-temperature flue gas preheating semicoke according to claim 1xMixed combustion system, it is characterised in that: institute
The preheating pipe (9) stated uses horizontal and vertical pipeline combination to extend duct length.
6. the low NO of station boiler of high-temperature flue gas preheating semicoke according to claim 1xMixed combustion system, it is characterised in that: institute
The pre- heat separator of the whirlwind stated (10) is using multiple cyclone separators in parallel or series.
7. the low NO of station boiler of high-temperature flue gas preheating semicoke according to claim 1xMixed combustion system, it is characterised in that: institute
Water-cooling system is provided on the pre- heat separator of the whirlwind stated (10) and preheating pipe (9).
8. a kind of low NO of station boiler of the high-temperature flue gas preheating semicoke of system as described in claim 1xMixed burning method, feature
It is:
1) bituminous coal and semicoke are using the method for dividing powder-grinding, and wherein the inflammable bituminous coal of high volatile is ground through bituminous coal coal pulverizer (13)
Afterwards, thicker pulverized bituminous coal is obtained, introduces ignition zone from lower furnace portion, half coke fuel uses bin storage type pulverizing system, leads to
Cross semicoke coal pulverizer (5) and carry out powder processed, obtain thinner semicoke coal dust and be stored in pulverized coal bin (6), after by coal, pulverulent fuel mixer
(8), it after preheating pipe (9) and the pre- heat separator of whirlwind, forms preheating semicoke and preheating produces the preheating half that gas classification sprays into burner hearth
Burnt combustion zone and the burning of pre- hot and NOXReducing zone；
2) high-temperature flue gas extracts from boiler horizontal gas pass and is sent into coal dust with adjustment flue-gas temperature and oxygen content after heat primary air proportion
Mixer (8), preheated pipeline (9) heat the half pre- heat separator of defocused feeding whirlwind (10), and the two is in the pre- heat separator of whirlwind
(10) it is sufficiently mixed in, after carrying out heat exchange and partial gasification reaction, the stronger pre- hot of separation output reproducibility is carried
There is a small amount of ultra-fine semicoke to be sent into pre- hot burning and NOxReducing zone, high-temperature semi-coke are sent into preheating coal-char combustion area；
3) by bituminous coal coal pulverizer (13) grind pulverized bituminous coal preheated by First air after be sent into lower furnace portion ignition zone with it is secondary
After wind mixes strongly, initial ignition zone is formed, generates and contains a certain concentration NOxFlue gas, excess air coefficient α be 0.6
~0.95；
4) preheating semicoke is sent into the preheating coal-char combustion area of burner hearth by heat primary air by semicoke air and powder mixer (11), passes through one
Secondary Air proportion adjusts this region excess air coefficient α < 1, forms fuel-rich combustion, reduces NOxGeneration；
5) the pre- heat separator of whirlwind (10) preheating produce gas and a small amount of ultra-fine semicoke spray into upper furnace the burning of pre- hot and
NOxReducing zone, this region activation semicoke uncombusted containing part simultaneously form the pre- hot having compared with strong reducing property atmosphere
Combustion zone；
6) select air or pure oxygen as burnout degree, the after-flame by upper furnace is arranged in divides spout to be sent into burner hearth, and fuel is made to exist
Excess air coefficient α > 1 reaches completely burned.
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