CN104089279B - Low nitrogen burning system - Google Patents
Low nitrogen burning system Download PDFInfo
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- CN104089279B CN104089279B CN201410323416.7A CN201410323416A CN104089279B CN 104089279 B CN104089279 B CN 104089279B CN 201410323416 A CN201410323416 A CN 201410323416A CN 104089279 B CN104089279 B CN 104089279B
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- transition region
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Abstract
The present invention relates to a kind of low nitrogen burning system, described system includes: humidifier, is used for providing steam；Secondary wind house steward, is conducted with humidifier, for guiding the steam in humidifier；Main combustion zone, house steward is conducted with secondary wind, and steam imports main combustion zone so that utilizes water gas reaction and water gas shift reaction to generate hydrogen in main combustion zone, utilizes hydrogen to restore nitrogen from nitrogen oxides；Transition region, it is conducted with main combustion zone, and with the connecting portion of main combustion zone, there is secondary hydrogenation spout, for spraying secondary hydrogenation medium to transition region, the reduction reaction and the water gas reaction that utilize carbon dioxide generate hydrogen again, restore nitrogen again with hydrogen from nitrogen oxides；Burning-out zone, is conducted with transition region, for discharging the gas that transition region generates.Low nitrogen burning system of the present invention, while reducing the generation of nitrogen oxides, it is achieved burn efficiently.
Description
Technical field
The present invention relates to the field of cleaning burning, particularly relate to a kind of low nitrogen burning system.
Background technology
Coal-burning boiler is the main frame in thermal power plant, is also main NOXEmission source.At present, combustion is controlled
Coal burning boiler NOXThe Technology Ways of discharge, is divided into low-NO_x combustion technology and gas denitrifying technology.
Existing low nitrogen technology, when actually used, often results in the decline of boiler combustion efficiency.In order to
Eliminate the efficiency loss that low nitrogen burning causes, and limited by source of the gas supply and operating cost.
In various low-NO_x combustion technology, such as, air staged combustion technology is used for low volatile coal (ratio
Such as anthracite and meager coal) time, due to the after-flame poor-performing of fuel, burnout degree is rearmounted makes carbon residue
Tail-off time significantly declines, it will usually causes the adverse consequences that unburned carbon in flue dust significantly raises, makes
Become the most serious energy waste and economic loss.
The thermal power industry of China, has the boiler controller system using anthracite or meager coal in a large number, disappears every year
Consumption anthracite and meager coal more than 200,000,000 ton, catching fire and after-flame poor performance of these coals, and use bituminous coal
Compare and need higher fire box temperature to ensure stable ignition and flying dust after-flame, cause thermal NOXBig
Amount generates, so these boiler controller system are under conventional combustion manner, and the NO in flue gasXConcentration all exists
More than 1000ppm (being 2～3 times of bituminous coal fired boiler), causes serious environmental pollution.
Due to initial NOXVery high concentrations, these boilers discharge standard to be reached then needs to use huge cigarette
Gas denitrification apparatus, consumes substantial amounts of expensive and toxic catalyst simultaneously.
Summary of the invention
It is an object of the invention to the defect for prior art, it is provided that a kind of low nitrogen burning system, can drop
The generation of low NOx, and efficient combustion efficiency can be realized.
For achieving the above object, the invention provides a kind of low nitrogen burning system, described system includes:
Humidifier, is used for providing steam；
Secondary wind house steward, is conducted with described humidifier, for guiding the steam in described humidifier；
Main combustion zone, is conducted with described secondary wind house steward, and described steam is imported described main combustion zone,
Make to utilize water gas reaction and water gas shift reaction to generate hydrogen in described main combustion zone, utilize hydrogen
Nitrogen is restored from nitrogen oxides；
Transition region, is conducted with described main combustion zone, and has two with the connecting portion of described main combustion zone
Secondary hydrogenation spout, for spraying secondary hydrogenation medium to described transition region, the reduction utilizing carbon dioxide is anti-
Should again generate hydrogen with water gas reaction, from nitrogen oxides, restore nitrogen again with hydrogen；
Burning-out zone, is conducted with described transition region, for discharging the gas that described transition region generates.
Low nitrogen burning system of the present invention uses air wetting and transition region secondary hydrogenation, is a kind of low cost
The honest and clean technical measures that can take into account efficiency of combustion and low nitrogen burning, can not increase energy consumption
Under premise, the ratio of C-H-O in regulation flue gas, it functions as and low-volatile coal is changed into height
Fugitive constituent coal, is allowed to have similar combustibility and NOXDischarge performance.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of low nitrogen burning system of the present invention；
Fig. 2 is the flow chart of low nitrogen burning method corresponding to low nitrogen burning system of the present invention.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.
In typical air classification type low nitrogen burner hearth during low volatile coal, flying dust will necessarily be caused
Phosphorus content significantly raises, so that air classification technology loses practical value.In order to solve above-mentioned asking
Topic, on the basis of conventional air classification type low nitrogen burning system, present invention proposition with air humidification is
Means increase the content of protium in flue gas, utilize the water of steam in low oxygen combustion district (main combustion zone)
Coal gas reaction and water gas shift reaction, increase local density of hydrogen, at reduction NOXWhile so that difficult
Be changed into the hydrogen of easy after-flame with the carbon residue of after-flame and carbon monoxide, the outlet in low oxygen combustion district utilizes
The most oxygenous but gas rich in protium is as the medium of stirring jet, the transition region before burnout degree
Interior to NOXCarry out secondary reduction, in transition region, also have flying dust carbon residue second gasification and the two of carbon monoxide simultaneously
Secondary conversion, then, when flue gas arrives burning-out zone, the carbon monoxide in flue gas and the carbon residue in flying dust are all by significantly
Degree is cut down, and combustible remaining in flue gas is mainly the hydrogen of easy after-flame.Use above technical measures it
After, the effect of low nitrogen and efficient burning can be reached simultaneously.
The present invention relates to one and nitrogen oxides from coal-fired boiler (NO can be greatly loweredX) initial concentration low
Nitrogen combustion system, particularly during a kind of low volatile coal, is reducing NOXEnergy while initial concentration
Enough reduce the low nitrogen burning system of unburned carbon in flue dust.On the premise of not raising unburned carbon in flue dust, by low
Nitrogen combustion technology cuts down NO in flue gasXInitial concentration, the boiler controller system using anthracite and meager coal is had
The meaning of particular importance.
Fig. 1 is the schematic diagram of low nitrogen burning system of the present invention, as it can be seen, the present invention specifically includes: add
Wet device 1, secondary wind house steward 3, main combustion zone 21, transition region 22, burning-out zone 23 and secondary hydrogenation spout
4。
Humidifier 1 is used for providing steam；Secondary wind house steward 3 is conducted with humidifier, adds for guiding
Steam in wet device 1.
Again as it is shown in figure 1, humidifier 1 has hot water inlet 10 and hot water emission's mouth 11.Hot water inlet
10 are used for injecting hot water, and hot water emission's mouth 11 is for discharging useless hot water.
Main combustion zone 21, with secondary wind house steward 3 conducting mutually, imports main combustion zone 21 by steam so that
Utilize water gas reaction and water gas shift reaction to generate hydrogen in main combustion zone 21, utilize hydrogen from nitrogen oxygen
Compound restores nitrogen.
In typical air classification type low nitrogen burner hearth during low volatile coal, flying dust will necessarily be caused
Phosphorus content significantly raises, so that air classification technology loses practical value.The present invention utilizes humidification
Device, with air humidification as means, increases the content of protium in the flue gas of main combustion zone, because main combustion zone is
Low oxygen combustion district, utilizes water gas reaction and the water gas shift reaction of steam, increases local hydrogen dense
Degree, at reduction NOXWhile, making it difficult to the carbon residue of after-flame and carbon monoxide are converted into the hydrogen of easy after-flame
Gas.
Transition region 22 is conducted with main combustion zone 21, and has secondary with the connecting portion of main combustion zone 21
Hydrogenation spout 4, for spraying secondary hydrogenation medium to transition region 22, utilizes the reduction reaction of carbon dioxide
Again generate hydrogen with water gas reaction, from nitrogen oxides, restore nitrogen again with hydrogen.
Further, transition region 22 has fire air nozzle 5.
In the junction of main combustion zone 21 transition region 22, there is secondary hydrogenation spout 4 and spray secondary hydrogenation
Medium, and secondary hydrogenation medium is the mixture of superheated steam and microfine coal, thus can be with overheated
Steam is medium, and conveying microfine coal forms stirring jet, enters in the transition region before fire air nozzle
Row secondary hydrogenation, it is achieved to NOXSecondary reduction, in transition region simultaneously also have flying dust carbon residue second gasification and
The quadratic transformation of carbon monoxide, then when flue gas arrives burning-out zone, in carbon monoxide in flue gas and flying dust
Carbon residue is all significantly cut down, and combustible remaining in flue gas is mainly the hydrogen of easy after-flame.Use with
After upper technical measures, the effect of low nitrogen and efficient burning can be reached simultaneously.
Burning-out zone 23 is conducted with transition region 22, for discharging the gas that transition region 22 generates.
In the low nitrogen burning system of the present invention, if ignition process is smooth, then add a small amount of in fuel
Moisture is i.e. remarkably improved efficiency of combustion, because the reaction that hydrogen atom concentration is to C-H-O combustion reaction system
Process and reaction rate have decisive influence, and it is reactant that low volatile coal is difficult to the main cause of after-flame
In system, hydrogen atom concentration is too low, so by supplementing protium in flue gas, can be significantly under hot conditions
Degree accelerates reaction rate.
The chemical reaction that the present invention works mainly has three:
First, the reduction reaction of carbon dioxide, reactant is carbon residue and carbon dioxide, and product is an oxygen
Changing carbon, its effect is that carbon residue is changed into carbon monoxide；
Second, water gas reaction, reactant is steam and carbon residue, and product is hydrogen and carbon monoxide,
Its effect is that carbon residue is changed into carbon monoxide and hydrogen；
3rd, water gas shift reaction, reactant is steam and carbon monoxide, and product is hydrogen and two
Carbonoxide, its effect is to be hydrogen by carbon monodixe conversion.
Three above reaction all has high reaction rate, at burner hearth in the hot environment more than 1250 DEG C
In common flue gas atmosphere, the response time needed for these three reaction is smaller than 100 milliseconds, end product
Concentration balance depend entirely on the protium content in flue gas, as long as protium content is sufficiently high, the most residual
Carbon and carbon monoxide all can transform to the hydrogen of easy after-flame, and efficiency of combustion increases, and hydrogen is to NOX
There is extremely strong reducing power, as long as so having enough density of hydrogen in low-oxygen environment, then in flue gas
NOXConcentration can significantly decline.It is above reaching the base of low nitrogen and efficient burning with hydrogenation for means simultaneously
This foundation.
During with low nitrogen burning for target, the reaction in transition region should not be carried out in the atmosphere containing oxygen,
This is because oxygen will necessarily consume hydrogen on the spot, the life-span of hydrogen is greatly lowered, weakens hydrogen reducing
NOXAbility, so being separately provided an anaerobic transition region in burner hearth and being necessary in this region hydrogenation,
The gas residence time in this region at least needs 100 milliseconds.In view of the inhomogeneities in flow field, Ze Gai district
The gas residence time in territory is designed as 200 milliseconds and is above reasonably.
Existing air classification low-NO_x combustion technology, side effect essentially consists in and reduces carbon monoxide and flying dust
The time of the active combustion reaction of carbon residue, efficiency of combustion decline therewith.In the present invention, by twice increasing
Hydrogen, before burning-out zone, carbon monoxide and carbon residue are exhausted substantially, remaining gas phase combustible component master
If hydrogen, the tail-off time of needs is greatly lowered, and this is for low-volatile coal particular importance.
Fig. 2 is the flow chart of low nitrogen burning method corresponding to low nitrogen burning system of the present invention, as it can be seen,
The method specifically includes following steps:
Step 100, utilizes humidifier to provide steam to secondary wind house steward；
Step 101, utilizes secondary wind house steward, imports steam to main combustion zone；
The present invention arranges a single secondary wind loop, to air humidification in secondary wind loop, hygroscopic water
From hot evaporation of water, the thermal source of evaporation process is from the sensible heat of hot water.In thermal power plant, circulation
Cooling water, boiler the hot water source such as ash flushing water the abundantest, contained waste heat accounts for the 60% of fuel combustion heat
Above, but owing to temperature is relatively low, this part of waste heat is difficult to recycle and be discharged among air, air
Humidification system takes about the 3% of this part of waste heat can meet the requirement of humidification.
Step 102, in main combustion zone, utilizes water gas reaction and water gas shift reaction to generate hydrogen, so
After utilize hydrogen to restore nitrogen from nitrogen oxides；
In main combustion zone, acceptable flue gas dew point about about 50 DEG C is without being heated to boiler
Wear adverse effect, so, the upper limit of air wetting is about the saturated air that air wetting is to 45 DEG C.
Design calculates in specification, and the air humidity content taken is 0.0161kg/kg (or 10.6g/Nm3), adds
During the saturated air of wet to 45 DEG C, air is taken moisture and is risen to 78.3g/Nm3 from 10.6g/Nm3, increases
Add 67.7g/Nm3.For using anthracitic boiler, typical data is: moisture-and-ash-free basis protium
Content 2.0%, moisture-and-ash-free basis low heat valve are 9.0 at 32MJ/kg, moisture-and-ash-free basis theoretical air requirement
Nm3/kg, amount of actual air for combustion are 11.7Nm3/kg, then have: after air wetting, often use 1,000
The anthracite of gram moisture-and-ash-free basis, adds 791 grams of steam in burner hearth flue gas, then the hydrogen in flue gas is former
Sub-concentration is higher than using flue gas produced by bituminous coal.The quality of newly-increased steam accounts for 5% left side of flue gas gross mass
The right side, can be effectively improved the reactivity worth of flue gas.The main combustion zone (i.e. lower furnace) of hypoxia is in height
The environment of temperature, NOXThree courses of reaction such as reduction, carbon residue gasification, carbon monodixe conversion are all strengthened.
Special needs to be pointed out is, when above-mentioned air humidifying system runs, do not increase the energy consumption of boiler, hot water
Heat needed for evaporation is essentially from the unserviceable waste heat in inside, power plant.
It is that 67.7g/Nm3 calculates according to the moisture that adds under typical condition, then has: the quality of newly-increased steam
Constituting about the 5% of flue gas gross mass, the big appointment of adiabatic flame temperature declines 80 DEG C, three atoms in flue gas
The concentration of gas has notable rising, and Radiant exothermicity increases, and its result is fire box temperature big appointment decline 100
About DEG C, so after air wetting, needing to be adjusted furnace heating surface, wall with refractory lining, refracto takes around increasing
Area about adding 6%.The increase of flue gas flow, also can make heat loss due to exhaust gas increase, boiler thermal output
To therefore reduce about 0.036%, this is the cost that air humidification is paid, but declines with unburned carbon in flue dust
Comparing, the increments of heat loss due to exhaust gas is negligible: unburned carbon in flue dust often declines 1%, boiler thermal effect
Rate can increase by 0.2, it is however generally that, anthracitic unburned carbon in flue dust can be reduced by 3% by air humidification
Above, boiler efficiency can improve about 0.6%, and the cost paid is only heat loss due to exhaust gas increase
0.036%, comprehensive for, air humidification can improve the thermal efficiency more than 0.5% of anthracite-fired boiler.
Step 103, sprays secondary hydrogenation medium from secondary hydrogenation spout to transition region；
Concrete, from secondary hydrogenation spout to the mixture of transition region injection superheated steam with microfine coal,
Microfine coal concentration is between 0～0.5kg/kg, and the exit velocity of spray secondary hydrogenation spout is not less than
60m/s。
Step 104, in transition region, utilizes the reduction reaction of carbon dioxide and water gas reaction again to generate
Hydrogen, then restores nitrogen again with hydrogen from nitrogen oxides.
Concrete, burning-out zone has fire air nozzle, between secondary hydrogenation spout and fire air nozzle away from
Reduction reaction and water gas reaction from the carbon dioxide met in step S4.
Because being provided with secondary hydrogenation spout, should have between secondary hydrogenation spout and fire air nozzle enough
Big spacing, at least ensures there are enough gas residence times between above-mentioned two groups of spouts.Secondary hydrogenation
Jet media is the mixture of superheated vapor and microfine coal, and coal powder density can between 0～0.5kg/kg
Adjusting, spout outlet flow velocity is not less than 60m/s.Steam source is taken from the low-pressure stage of steam turbine and is drawn gas, the amount of drawing gas
Account for about the 0.5% of steam turbine total flow, after throttling, become superheated steam；Microfine coal take from weary gas (in
Between bin system) or First air (unit pulverized-coal system), microfine coal used accounts for total coal
About the 1% of consumption.
Actually used on certain power plant's W flame coal-powder boiler (300MW fired power generating unit) of this low nitrogen burning method
Show, when using anthracite, NO in flue gasXLowering of concentration more than 50%, unburned carbon in flue dust have dropped 3
More than percentage point, it is possible to reach improve efficiency of combustion and reduce NO simultaneouslyXEffect.
Low nitrogen burning system of the present invention is with the substantive difference of prior art: utilize the sky participating in burning
The method that gas carries out humidifying completes the hydrogenation to flue gas in lower furnace, injects with overheated in transition region
Steam and microfine coal mixture are the jet of medium, it is achieved the secondary hydrogenation to flue gas.By to flue gas
Carry out twice hydrogenation, realize NO simultaneouslyXThree processes such as reduction, carbon residue gasification, carbon monodixe conversion, reach
Become the technical goal of low volatile coal low nitrogen efficient burning.
Above-described detailed description of the invention, is carried out the purpose of the present invention, technical scheme and beneficial effect
Further describe, be it should be understood that the foregoing is only the present invention detailed description of the invention and
, the protection domain being not intended to limit the present invention, all within the spirit and principles in the present invention, done
Any modification, equivalent substitution and improvement etc., should be included within the scope of the present invention.
Claims (8)
1. a low nitrogen burning system, it is characterised in that described system includes:
Humidifier, is used for providing steam；
Secondary wind house steward, is conducted with described humidifier, for guiding the steam in described humidifier；
Main combustion zone, is conducted with described secondary wind house steward, and described steam is imported described main combustion zone,
Make to utilize water gas reaction and water gas shift reaction to generate hydrogen in described main combustion zone, utilize hydrogen
Nitrogen is restored from nitrogen oxides；
Transition region, is conducted with described main combustion zone, and has two with the connecting portion of described main combustion zone
Secondary hydrogenation spout, for spraying secondary hydrogenation medium to described transition region, the reduction utilizing carbon dioxide is anti-
Should again generate hydrogen with water gas reaction, from nitrogen oxides, restore nitrogen again with hydrogen；
Burning-out zone, is conducted with described transition region, for discharging the gas that described transition region generates.
System the most according to claim 1, it is characterised in that described humidifier has hot water inlet,
For injecting hot water.
System the most according to claim 1, it is characterised in that described humidifier has hot water emission
Mouthful, for discharging useless hot water.
System the most according to claim 1, it is characterised in that described secondary hydrogenation medium was
Vapours and the mixture of microfine coal.
System the most according to claim 4, it is characterised in that described microfine coal concentration 0～
Between 0.5kg/kg.
System the most according to claim 1, it is characterised in that going out of described secondary hydrogenation spout
Mouth flow velocity is not less than 60m/s.
System the most according to claim 1, it is characterised in that described system has fire air nozzle.
System the most according to claim 1, it is characterised in that described secondary hydrogenation spout and after-flame
Distance between wind snout meets reduction reaction and the water gas reaction of the carbon dioxide in transition region.
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| CN105157030A (en) * | 2015-09-28 | 2015-12-16 | 贵阳高新科翰科技有限公司 | Method for reducing emission of nitrogen oxide in garbage incineration process |
| CN106433798B (en) * | 2016-09-19 | 2019-06-04 | 石家庄新华能源环保科技股份有限公司 | A kind of hydrogen electric energy system |
| CN111115577B (en) * | 2020-02-19 | 2024-09-17 | 李根钧 | Catalytic hydrogen production system and system for reducing nitrogen oxides by hydrogen combustion |
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| US5967061A (en) * | 1997-01-14 | 1999-10-19 | Energy And Environmental Research Corporation | Method and system for reducing nitrogen oxide and sulfur oxide emissions from carbonaceous fuel combustion flue gases |
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