CN109869712A - A kind of modified coal fires the system and its processing method of desulphurization denitration again - Google Patents
A kind of modified coal fires the system and its processing method of desulphurization denitration again Download PDFInfo
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Abstract
The present invention provides systems and its processing method that a kind of modified coal fires desulphurization denitration again, the system comprises coal-burning boilers and modified compound coal dust spraying system, wherein the burner hearth of coal-burning boiler successively includes primary zone, reburning zone and burning-out zone from the bottom to top, it is equipped with modified compound coal dust on the furnace wall at reburning zone and spurts into mouth, after-flame air port is equipped on the furnace wall above reburning zone, the material outlet of modified compound coal dust spraying system spurts into mouth with modified compound coal dust and is connected.The microfine coal for containing compound chemical additives is entered burner hearth by system of the present invention, forms fuel-rich, the combustion zone again of strong reducing property atmosphere, hydrocarbon active element needed for generating denitration, the NO generated with burner hearth bottom main burning areaxReduction reaction occurs, NO is effectively reducedxDischarge.The desulfurizing agent contained in compound additive simultaneously in flue gas sulfur dioxide and sulfur trioxide react, realize and remove SOxPurpose.
Description
Technical field
Boiler flue gas purification field of the present invention is related to system and its processing method that a kind of modified coal fires desulphurization denitration again.
Background technique
NO is reduced using reburning technologyxDischarge is a kind of denitration in the stove technology using fuel-staged combustion.Specific real
Shi Shi will be divided into from bottom to top main burning area, reburning zone and burnt zone in boiler furnace.(usually by the major part of boiler feed
70%~90% or so) fuel is sent into main burning area, life of burning in the environment of oxygen abundant (i.e. excess air factor > 1)
At NOx.Remaining 10%~30% or so fuel is re-fed into reburning zone, forms the oxygen debt reproducibility gas of excess air factor < 1
Atmosphere.In the NO that primary combustion zone generatesxReduction reaction occurs in the reducing atmosphere of reburning zone and ultimately generates N2, without complete
Fuel or intermediate (such as CO and CH of burning4Deng) when flowing through the burnt zone on reburning zone top, it is sufficiently fired with burnout degree
It burns, reaches combustion product completely burned.
There are many reburning fuel type, and the research of current most of reburning technologies is using gaseous hydrocarbons such as natural gases as fuel.
In recent years, research also realizes denitration in the stove using coal dust as reburning fuel.CN 1587800A discloses a kind of using three times
Fine breeze collection is fired again in wind reduces NOxDischarge method and system, the invention will contain fine breeze (coal identical as boiler fired coal
Kind) tertiary air carry out separation concentration, tertiary air is then divided into 2 strands: one is rich pulverized coal flow, and another stock is dilute pulverized coal flow,
Rich pulverized coal flow enters burner hearth as reburning fuel spray feed, and dilute pulverized coal flow is arranged in reburning zone top as fire air nozzle.This method
Tertiary air feed system need to be transformed, NO can be reducedxDischarge 40%~50% is suitable for pulverized-coal fired boiler.CN 101078517A
It is interior using microfine coal as reburning fuel to disclose a kind of coal furnace, and spraying acylate solution in its combustion process is to promote
Agent, while scrubbing CO_2 and nitrogen oxides.Studies have shown that using a kind of mixed coal microfine coal for reburning fuel, with acetic acid
Calcium and magnesium (CMA) is promotor, and the molar ratio that reburning fuel ratio is 25%, Ca/S is 2.0, SO2Removal efficiency 78%, NOxRemoving effect
Rate is 85%.Simultaneously removing sulfur and nitrogen in furnace, but used acylate (such as first may be implemented in the method for the obvious disclosure of the invention
Sour calcium, calcium acetate, calcium magnesium acetate, calcium propionate etc.) it is expensive, it is difficult to commercial introduction application.(" the O such as Liu Hongtao2/CO2Under atmosphere
The wooden quenched lime stone of vinegar fires/progressive construction performance study again ", chemistry of fuel journal, the 2nd phase of volume 41,228-23,
2013) using sedimentation furnace denitration experimental bench to the quenched lime stone of the wooden vinegar and calcium acetate fire again or advanced reburning is (i.e. substantially again
Ammonia agent is injected to reburning zone simultaneously on the basis of combustion, while utilization is fired again and SNCR denitration) test.Experiments have shown that O2/CO2Gas
Calcium acetate and the wooden quenched lime stone advanced reburning of vinegar can obtain higher denitration efficiency, optimal reaction temperature 1050 under atmosphere
℃.But this method is expensive using calcium acetate and the quenched lime stone of the wooden vinegar, also needs mating SNCR system, and investment is big, and operation is multiple
Miscellaneous, operating cost is high.In addition, being not suitable for recirculating fluidized bed process since its optimal reaction temperature is higher.Yu Haimiao etc. is (" again
The influence of combustion, spray calcium to fouling and slagging characteristics in burning Shenhua coal stove ", journal of Zhejiang university (engineering version), the 7th phase of volume 40,
1187-1191,2006) it is sprayed in progress furnace when carrying out coal dust excessively heated axle again in tetra- jiaos of trial furnaces of 2.11MW using low melting point Firing Shenhua Coal
The test of calcium.The result shows that reburning zone is formed because of the addition of reducing atmosphere and calcium compared with low melting point submellite, hedenbergite etc.
Eutectic and the severe exacerbation for causing Slagging.Therefore, pass through coal dust denitration by refueling, while calcium injection and desulfurization in reburning zone, deposit
Deteriorate ash erosion, it is difficult to the problem of practical application.
In conclusion NO can be effectively reduced using micronized coal reburning technologyxDischarge, be a kind of economy, simple furnace
Interior denitration technology.But current coal dust denitration by refueling is only applicable to the worst hot case (> 1000 DEG C) of pulverized-coal fired boiler, to ciculation fluidized
Bed boiler (temperature < 900 DEG C) denitration effect is limited.Using firing again and SNCR or in-furnace calcium spraying combine, mating list is not only needed
Only spray ammonia, sprays calcium system, and there is also can operation temperature section it is smaller, complicated for operation, the problems such as operating cost is higher.Cause
This, it is wide to need to develop a kind of operation temperature, easy to operate, the cheap simultaneously removing sulfur and nitrogen in furnace technology of operating cost.
Summary of the invention
For complicated for operation present in existing coal-burning boiler reburning technology, operating cost is higher, needs additionally to be added with
The problems such as substances such as machine acid, ash erosion is serious, the present invention provides system and its places that a kind of modified coal fires desulphurization denitration again
Reason method.The microfine coal for containing compound chemical additives is entered burner hearth, shape by system of the present invention
At fuel-rich, the combustion zone again of strong reducing property atmosphere, hydrocarbon active element needed for generating denitration, with burner hearth bottom main burning area
The NO of generationxReduction reaction occurs, NO is effectively reducedxDischarge.Two in desulfurizing agent and flue gas contained in compound additive simultaneously
Sulfur oxide and sulfur trioxide reaction, realize removing SOxPurpose.
To achieve this purpose, the present invention adopts the following technical scheme:
In a first aspect, the system comprises coal-fired pots the present invention provides the system that a kind of modified coal fires desulphurization denitration again
Furnace and modified compound coal dust spraying system, wherein the burner hearth of coal-burning boiler successively includes primary zone, reburning zone and combustion from the bottom to top
Area to the greatest extent is equipped with modified compound coal dust on the furnace wall at reburning zone and spurts into mouth, after-flame is equipped on the furnace wall above reburning zone
Air port, the material outlet of modified compound coal dust spraying system spurt into mouth with modified compound coal dust and are connected.
System of the present invention is fitted in the combustion zone again of coal-burning boiler, by the combustion of total fuel 10wt~30wt% used in boiler
Material is sprayed into the form of superfine modified compound coal dust, total excess air factor 0.7~0.9 is controlled, to form anoxic fuel-rich
On the one hand the burning condition of strongly reducing atmosphere inhibits again burning coal powder to generate combustion NOx, while making the NO generated in main burning areaxOccur
Reduction reaction further decreases NOxDischarge.On reburning zone top, air needed for spraying into after-flame, it is ensured that in primary zone and reburning zone
There is no clean-burning fuel and in-between combustible full combustion.
It is used as currently preferred technical solution below, but not as the limitation of technical solution provided by the invention, passes through
Following technical scheme can preferably reach and realize technical purpose and beneficial effect of the invention.
As currently preferred technical solution, institute's coal-burning boiler is circulating fluidized bed boiler.
Preferably, when coal-burning boiler is circulating fluidized bed boiler, primary zone is the close phase of Fluidized Boiler Bed layer
Area.
Preferably, after-flame air port is equipped on the furnace wall between reburning zone and burning-out zone.
Preferably, overfiren air port is equipped in reburning zone.
As currently preferred technical solution, the compound coal dust spraying system of modification includes powder fluidization device, height
Pressure gas stream dispersal device, electrostatic dispersion device and powder output device；Wherein, powder fluidization device side wall is equipped with modified complex coal
Powder feed inlet, powder fluidization bottom of device are equipped with gas access, are equipped with material outlet at the top of powder fluidization device, material outlet with
The material inlet of high pressure draught dispersal device is connected；The material outlet of high pressure draught dispersal device and the material of electrostatic dispersion device
Entrance is connected, and the material outlet of electrostatic dispersion device and the material outlet of powder output device, the material of powder output device go out
Mouth spurts into mouth with the compound coal dust of modification on the furnace wall of coal-burning boiler reburning zone and is connected.
Reunite since the sub-micron-powder of dispersion easily generates secondary coalescence in process of air delivery, thus the system
System, which will pass through, to be dried, more granularity fluidizations, high pressure draught disperses and a variety of dispersion technologies such as electrostatic combine, and realize superfine powder
Body it is fully dispersed.
The present invention uses multicomponent and/or more partial size fluidization technologies, using stream of relatively coarse particles, to superfine powder powder
It is dried, the control of primarily broken and feed rate.
The present invention carries out twice dispersing to superfine powder using high pressure draught dispersion technology, is carried out using pressure-air to it
Constantly dry, loosening, to reduce the liquid bridge power between powder granule, while increasing its mobility；Meanwhile it is heated after high pressure gas
Stream can heat powder, enter charge device jointly with powder, so that powder granule is carried upper a large amount of electrostatic charges, utilize lotus
Electrostatic repulsion between electric particle prevents intergranular mutual reunion, prevent dispersion powder agglomerate again occurs entering stokehold, make
Its dispersity for being in substantially uniformity has optimum activity state, is finally sprayed by the powder output device of front end.Herein
In the process, allowing powder granule charged to greatest extent is the key that realize powder dispersion, anti-agglomeration.
As currently preferred technical solution, the compound coal dust feed inlet connection of the modification of the powder fluidization device is modified
Compound coal dust feeding device.
Preferably, the compound coal dust feeding device of the modification includes modified compound coal dust storage tank and feeding material component, and storage tank is logical
Feeding material component is crossed to connect with modified compound coal dust feed inlet.
Preferably, the feeding material component includes screw delivery pump and/or chain transfer.
Preferably, the powder fluidization device includes powder fluidization bed.
Preferably, the high pressure draught dispersal device includes gas pipeline, and high pressure gas nozzle is arranged in gas pipeline end, to
High pressure draught impact dispersion, the injection of the high pressure gas nozzle are carried out to the material generated from powder fluidization device using high pressure draught
Pressure be 80kPa~100kPa, such as 80kPa, 83kPa, 85kPa, 87kPa, 90kPa, 93kPa, 95kPa, 97kPa or
100kPa etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
Preferably, the system also includes gas heat drying device, the gas vents of the gas heat drying device
It is connected with the gas pipeline entrance of the gas access of powder fluidization device and high pressure draught dispersal device.
Preferably, the gas pipeline entrance of the gas vent of the gas heat drying device and high pressure draught dispersal device
Between be arranged pressure conveying assembly.
Preferably, the pressure conveying assembly includes high pressure blower, and discharge pressure is 80kPa~100kPa, such as
80kPa, 83kPa, 85kPa, 87kPa, 90kPa, 93kPa, 95kPa, 97kPa or 100kPa etc., it is not limited to cited
Numerical value, other unlisted numerical value are equally applicable in the numberical range.
As currently preferred technical solution, the electrostatic dispersion device includes charged needle, charged needle rack, insulation
Pipe, ground loop and power supply, wherein charged needle and charged needle rack are placed in insulation tube, and charged needle and charged needle rack are vertically simultaneously
It is connected, charged needle rack is fixed in insulation tube, and ground loop is connected around insulation tube, power supply is surrounded with charged needle rack.
In the present invention, the charged needle and charged needle rack of the charge device are mounted in insulation tube, and charged needle passes through branch
Frame is connected with power supply, and power supply, charged needle and ground loop form a stronger corona field, when making powder granule by the insulation tube
Due to the charged effect of electrostatic field, keep powder charged to greatest extent, so that there are biggish coulomb repulsion power between making particle.
Preferably, the powder output device includes Laval nozzle.
Second aspect, the present invention provides the processing methods of above system, the described method comprises the following steps:
Fuel is passed through in the primary zone of coal-burning boiler and First air forms single-stage combustion area, is sprayed in the reburning zone of coal-burning boiler
Enter modified compound coal dust and Secondary Air is fired again, then the flue gas after firing enters burning-out zone and burnout degree catalytic combustion.
In the present invention, the superfine modified compound coal dust of penetrating can generate hydrocarbon activity member needed for denitration in combustion zone again
Element, the NO generated with burner hearth bottom main burning areaxReduction reaction occurs, NO is effectively reducedxDischarge.Meanwhile containing in compound additive
Some desulfurizing agents in flue gas sulfur dioxide and sulfur trioxide react, realize removing SOxPurpose.
As currently preferred technical solution, the fuel being passed through in primary zone be total fuel 70wt%~
90wt%, such as 70wt%, 73wt%, 75wt%, 77wt%, 80wt%, 83wt%, 85wt%, 87wt% or 90wt% etc.,
It is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.Heretofore described master
It is fuel used for common fuel in coal-burning boiler to fire area.
Preferably, when coal furnace is circulating fluidized bed boiler, the primary zone of the coal-burning boiler is bed emulsion zone,
The primary air flow being passed through is 40%~60% of theoretical air requirement volume needed for primary zone is burnt, for example, 40%, 43%, 45%,
47%, 50%, 53%, 55%, 57% or 60% etc., it is not limited to cited numerical value, in the numberical range, other are not
The numerical value enumerated is equally applicable, so that fuel burns under conditions of anoxic fuel-rich, to reduce the temperature levels in primary zone
With and appropriate reducing atmosphere is provided, naturally inhibit NOxGeneration.
As currently preferred technical solution, the dosage of the compound coal dust of modification is total fuel used in coal-burning boiler
10wt%~30wt%, for example, 10wt%, 13wt%, 15wt%, 17wt%, 20wt%, 23wt%, 25wt%, 27wt% or
30wt% etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
Preferably, the excess air factor of the reburning zone is 0.7~0.9, such as 0.7,0.75,0.8,0.85 or 0.9
Deng it is not limited to cited numerical value, other unlisted numerical value are equally applicable in the numberical range.
The present invention by adjusting reburning zone fuel straying quatity and excess air factor, so that it is strong to form anoxic fuel-rich
On the one hand the burning condition of reducing atmosphere inhibits again burning coal powder to generate combustion NOx, while making the NO generated in main burning areaxOccur also
Original reaction further decreases NOxDischarge.
Preferably, the compound coal dust of the modification sprays into reburning zone by modified compound coal dust spraying system.
Preferably, the compound coal dust of the modification is successively sprayed into after fluidization, high pressure draught dispersion and electrostatic dispersion and is fired again
Area.
Preferably, the fluidization carries out in powder fluidization device.
Preferably, the gases used air for by heating in the fluidizing gas.
Preferably, it is described by heating air temperature be 60 DEG C~90 DEG C, such as 60 DEG C, 65 DEG C, 70 DEG C, 75 DEG C,
80 DEG C, 85 DEG C or 90 DEG C etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With.
Preferably, flow velocity gases used in the fluidizing gas is 3m/s~5m/s, such as 3m/s, 3.5m/s, 4m/
S, 4.5m/s or 5m/s etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With.
Preferably, the high pressure draught is dispersed in high pressure draught dispersal device and carries out.
Preferably, the pressure of high pressure draught used is 80kPa~100kPa in high pressure draught dispersion, such as 80kPa,
83kPa, 85kPa, 87kPa, 90kPa, 93kPa, 95kPa, 97kPa or 100kPa etc., it is not limited to cited numerical value,
Other unlisted numerical value are equally applicable in the numberical range.
Preferably, high pressure draught used is into the air crossed after heating in high pressure draught dispersion, and temperature is 60 DEG C
~90 DEG C, such as 60 DEG C, 65 DEG C, 70 DEG C, 75 DEG C, 80 DEG C, 85 DEG C or 90 DEG C etc., it is not limited to cited numerical value, it should
Other unlisted numerical value are equally applicable in numberical range.
Preferably, the electrostatic dispersion carries out in electrostatic dispersion device.
Preferably, power supply applied in the electrostatic dispersion is high voltage power supply, and voltage is 50kV~90kV, such as
50kV, 55kV, 60kV, 65kV, 70kV, 75kV, 80kV, 85kV or 90kV etc., it is not limited to cited numerical value, the number
It is equally applicable to be worth other unlisted numerical value in range.
Preferably, in the electrostatic dispersion electric current be 6mA~8mA, such as 6mA, 6.5mA, 7mA, 7.5mA or 8mA etc., but
It is not limited in cited numerical value, other unlisted numerical value are equally applicable in the numberical range.
Preferably, the output is carried out by powder output device.
Preferably, the powder output is sprayed using Laval nozzle.
As currently preferred technical solution, the compound coal dust of modification includes coal dust, nitrogenous reagent and desulfurization inferior
Agent, wherein the content of coal dust inferior is 85wt%~90wt%, such as 85wt%, 86wt%, 87wt%, 88wt%, 89wt%
Or 90wt% etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.Wherein
Nitrogenous reagent and desulfurizing agent additive amount it is true according to the combustion state and flue gas pollutant emission behaviour of circulating fluidized bed boiler
It is fixed.
Preferably, the compound coal dust of the modification further includes any one in powdered biomass, waste plastics or mercury removal agent or extremely
Few two kinds of combination, any one in powdered biomass, waste plastics or mercury removal agent or at least two combined additive amount are changing
Property compound coal dust in accounting be less than 5wt%, such as 4wt%, 3wt%, 2wt% or 1wt% etc., it is not limited to cited
Numerical value, other unlisted numerical value are equally applicable in the numberical range.The biomass added in compound coal dust of the present invention
Particle and waste plastics can provide active CH for the burning of reburning zone.
Preferably, the coal dust inferior includes high-sulfur coal dust and/or brown coal powder.
Preferably, in the high-sulfur coal dust sulfur content be greater than 1wt%, such as 1.5wt%, 2wt%, 3wt%, 4wt% or
5wt% etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
Preferably, the nitrogenous reagent is urea and/or bio-feritlizer.The bio-feritlizer can be the biological excrement such as chicken manure
Just.The nitrogenous reagent provides ammonia reducing agent for the burning of combustion zone.
Preferably, the desulfurizing agent includes any in calcium hydroxide, sodium bicarbonate, sodium hydroxide, sodium sulphate or sodium sulfite
It is a kind of or at least two combination, the combination is typical but non-limiting example has: the combination of calcium hydroxide and sodium bicarbonate, carbonic acid
The combination of the combination of the combination of hydrogen sodium and sodium hydroxide, sodium hydroxide and sodium sulphate, sodium sulphate and sodium sulfite, calcium hydroxide, carbon
The combination of sour hydrogen sodium and sodium hydroxide, the combination of sodium hydroxide, sodium sulphate and sodium sulfite, calcium hydroxide, sodium bicarbonate, hydroxide
The combination of sodium and sodium sulphate, sodium bicarbonate, sodium hydroxide, sodium sulphate and combination of sodium sulfite etc..
Preferably, the powdered biomass is made by biological particles, and wherein biological particles include pine, wood shavings, straw
Any one in stalk, straw, rice husk, peanut shell, corncob, oil tea shell or cotton seed hulls or at least two combination.The combination
Typical but non-limiting example has: the combination of the combination of pine and wood shavings, stalk and straw, the group of straw, rice husk and peanut shell
It closes, corncob, oil tea shell and combination of cotton seed hulls etc..
Superfine modified compound coal dust is prepared using colm in the present invention, low-quality coal resources is not only made to have obtained effective benefit
With, while passing through the cooperation with additive, moreover it is possible to the coal-fired nitrogen oxides generated in boiler primary zone is effectively reduced.
The operation temperature for the superfine modified compound coal dust being made into the present invention by colm and additive is wide, and (it operates temperature
Section is spent up to 800 DEG C~1200 DEG C), it is suitable for including circulating fluidized bed boiler, the industry pot such as pulverized-coal fired boiler and chain grate furnace
The operation operating condition of furnace.Meanwhile the compound additive is effectively removing SOxAnd NOxWhile, do not cause boiler scaling to deteriorate.And
And simultaneous SO_2 and NO removal may be implemented in the present invention, is not required to compound additive and individually sprays into facility, is not required to be transformed boiler.
Using desulfurizing agent as sodium bicarbonate, nitrogenous reagent is for urea, the superfine modified compound coal dust is carrying out desulfurization
Following reaction is found when denitration:
When 120 DEG C of ignition temperature >
2NaHCO3→Na2CO3+CO2+H2O,
Desulfurization overall reaction are as follows:
2NaHCO3+SO2+1/2O2→Na2SO4+2CO2+H2O,
Na2CO3+SO2+1/2O2→Na2SO4+CO2+H2O,
2NaHCO3+SO3→Na2SO4+2CO2↑+H2O,
Na2CO3+SO3→Na2SO4+CO2+H2O,
The product Na that desulphurization reaction generates2CO3、Na2SO4NO is catalyzed to NO2Heterogeneous reaction:
NO+1/2O2→NO2,
Then NO2With NaHCO3Reaction generates NaNO3:
Preferably, the compound coal dust of the modification is superfine modified compound coal dust, wherein 100 μm of partial size < of coal dust inferior,
Such as 90 μm, 80 μm, 70 μm, 60 μm, 50 μm, 40 μm, 30 μm, 20 μm or 10 μm etc., it is not limited to cited numerical value,
Other unlisted numerical value are equally applicable in the numberical range, preferably 50 μm of <, further preferably 10 μm of <.
Preferably, the partial size of inferior coal dust is greater than the partial size of remaining component in the compound coal dust of the modification.
In the present invention, the partial size of poor quality coal dust in superfine modified compound coal dust is set to be greater than the partial size of itself and component, so that bad
After matter coal dust is mixed with other components, coal dust can play the role of dispersing agent, so that the flowing for being effectively improved superfine powder is special
Property.
As currently preferred technical solution, the preparation method of the compound coal dust of modification the following steps are included:
(a) colm is carried out to powder processed after primary breakup, obtains coal dust inferior；
(b) powder processed will be carried out after the group lease making primary breakup in the compound coal dust of modification in addition to colm, obtains additive
Powder；
(c) modified complex coal is obtained after mixing coal dust inferior obtained by step (a) with additive powder described in step (b)
Powder, mixed proportion are carried out by the proportion of each component in aforementioned superfine modified compound coal dust.
Preferably, step (a) primary breakup is to partial size < 5mm, for example, 4.5mm, 4mm, 3.5mm, 3mm, 2.5mm,
2mm, 1.5mm or 1mm etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With preferably partial size < 2mm.
Preferably, step (a) powder processed is to 100 μm of partial size <, such as 90 μm, 80 μm, 70 μm, 60 μm, 50 μm, 40 μ
M, 30 μm, 20 μm or 10 μm etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are same
It is applicable in, preferably 50 μm of <, further preferably 10 μm of <.
Preferably, step (b) primary breakup is to partial size < 5mm, for example, 4.5mm, 4mm, 3.5mm, 3mm, 2.5mm,
2mm, 1.5mm or 1mm etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With preferably partial size < 2mm.
Preferably, step (b) powder processed is to 50 μm of partial size <, for example, 45 μm, 40 μm, 35 μm, 30 μm, 25 μm, 20 μm,
15 μm, 10 μm or 5 μm etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With preferably 10 μm of <, further preferably 5 μm of <.
Compared with prior art, the invention has the following advantages:
(1) present invention prepares microfine coal using tinpot coal, is not only to fire to provide ideal reburning fuel, Er Qiewei again
Effective way is created in the effective use of tinpot coal, and is utilized and be added to additive and the microfine coal with high volatile,
It can promote fired coal combustion situation, reduce fly ash combustible material, improve boiler efficiency；Meanwhile coal dust in microfine coal and other
After component mixing, coal dust can play the role of dispersing agent, to be effectively improved the flow behavior of superfine powder；
(2) present invention, which integrates, fires again, is enriched with reduction and SNCR, is not necessarily to or smaller to boiler combustion equipment need to only change
Dynamic, small investment is run low with maintenance cost；Simultaneously also without the elegant problem of ammonia, without using substances such as liquefied ammonia or organic acids, it is avoided
The problems such as subsidiary pollution, corrosion and equipment blocks；
(3) SO can be effectively reduced in the present invention2To SO3Conversion, the generation of inviscid ammonium sulfate (ammonium sulfite) avoids
The problems such as ash and equipment blocking, is stained in pollution, burn into slagging brought by it；
(4) in system and method for the present invention the effecting reaction temperature range of modified compound coal dust it is wide (up to 800 DEG C~
1200 DEG C), it is long in residing time in furnace, be evenly distributed, can effectively improve denitrification efficiency, make denitration efficiency improve to
80%, desulfuration efficiency is improved to 95%.
Detailed description of the invention
Fig. 1 is the system structure diagram that modified coal described in the embodiment of the present invention 1 fires desulphurization denitration again；
Fig. 2 is the structural schematic diagram of electrostatic dispersion device described in the embodiment of the present invention 1；
Wherein, 1- coal-burning boiler, the primary zone 2-, the reburning zone 3-, 4- burning-out zone, the modified compound coal dust of 5- spurt into mouth, 6-
After-flame air port, 7- gas heat drying device, 8- powder fluidization device, 9- high pressure draught dispersal device, 10- electrostatic dispersion dress
It sets, 11- powder output device, 12- storage tank, 13- feeding material component, 14- high pressure blower, the charged needle of 101-, the charged needle rack of 102-,
103- insulation tube, 104- ground loop, 105- power supply.
Specific embodiment
In order to better illustrate the present invention, it is easy to understand technical solution of the present invention, below further specifically to the present invention
It is bright.But following embodiments is only simple example of the invention, does not represent or limit the scope of the present invention, this
Invention protection scope is subject to claims.
Specific embodiment of the invention part provides the system that a kind of modified coal fires desulphurization denitration again, the system comprises
Coal-burning boiler and modified compound coal dust spraying system, wherein the burner hearth of coal-burning boiler includes successively from the bottom to top primary zone, fires again
Area and burning-out zone are equipped with modified compound coal dust on the furnace wall at reburning zone and spurt into mouth, set on the furnace wall above reburning zone
There is after-flame air port, the material outlet of modified compound coal dust spraying system spurts into mouth with modified compound coal dust and is connected.
The processing method of the system the following steps are included:
Fuel is passed through in the primary zone of coal-burning boiler and First air forms single-stage combustion area, is sprayed in the reburning zone of coal-burning boiler
Enter modified compound coal dust and Secondary Air is fired again, then the flue gas after firing enters burning-out zone and burnout degree catalytic combustion.
The following are typical but non-limiting embodiments of the invention:
Embodiment 1:
System and its processing method that a kind of modified coal fires desulphurization denitration again are present embodiments provided, as shown in Figure 1, described
System includes coal-burning boiler 1 and modified compound coal dust spraying system, and wherein coal-burning boiler is circulating fluidized bed boiler, burner hearth by
Under it is supreme successively include primary zone 2, reburning zone 3 and burning-out zone 4, modified compound pulverized coal injection is equipped on the furnace wall at reburning zone 3
Entry portal 5 is equipped with after-flame air port 6, the object of modified compound coal dust spraying system on the furnace wall between reburning zone 3 and burning-out zone 4
Material outlet spurts into 5 mouthfuls with modified compound coal dust and is connected；
Modified compound coal dust spraying system includes modified compound coal dust feeding device, gas heat drying device 7, powder powder
Body fluidizer 8, high pressure draught dispersal device 9, electrostatic dispersion device 10 and powder output device 11；Wherein, modified complex coal
Powder feeding device includes modified compound coal dust storage tank 12 and feeding material component 13, and 8 side wall of powder fluidization device is equipped with modified complex coal
Powder feed inlet, storage tank 12 are connect by feeding material component 13 with modified compound coal dust feed inlet；8 bottom of powder fluidization device is equipped with gas
Body entrance is equipped with material outlet, the material inlet phase of material outlet and high pressure draught dispersal device 9 at the top of powder fluidization device 8
Even；The material outlet of high pressure draught dispersal device 9 is connected with the material inlet of electrostatic dispersion device 10, electrostatic dispersion device 10
The material outlet of material outlet and powder output device 11, the material outlet and coal-burning boiler reburning zone furnace of powder output device 11
The compound coal dust of modification on wall spurts into mouth 5 and is connected；
The feeding material component 13 is screw delivery pump, and powder fluidization device 8 is powder fluidization bed；
The high pressure draught dispersal device 9 includes gas pipeline, and high pressure gas nozzle is arranged in gas pipeline end；
The gas vent of the gas heat drying device 7 and the gas access of powder fluidization device 8 and high pressure gas flow point
It is in bulk set 9 gas pipeline entrance be connected；
Between the gas vent of the gas heat drying device 7 and the gas pipeline entrance of high pressure draught dispersal device 9
High pressure blower 14 is set；
As shown in Fig. 2, the electrostatic dispersion device includes charged needle 101, charged needle rack 102, insulation tube 103, ground connection
Ring 104 and power supply 105, wherein charged needle 101 and charged needle rack 102 are placed in insulation tube 103, charged needle 101 and charged needle
Bracket 102 is vertical and is connected, and charged needle rack 102 is fixed in insulation tube 103, and ground loop 104, which is surround, surrounds insulation tube 103,
Power supply 105 is connected with charged needle rack 102；
The powder output device 11 includes Laval nozzle.
The modified coal fire the processing method of the system of desulphurization denitration again the following steps are included:
Fuel is passed through in the primary zone of circulating fluidized bed boiler 2 and First air forms single-stage combustion area, in recirculating fluidized bed
The reburning zone 3 of boiler sprays into modified compound coal dust by modified compound coal dust spraying system and is fired again, then the flue gas after firing into
Enter burning-out zone 4 and burnout degree catalytic combustion；
Wherein, in the 80wt% that the fuel that primary zone 2 is passed through is total fuel, the primary air flow being passed through is primary zone burning institute
The 50% of theoretical air requirement volume is needed, the dosage of modified compound coal dust is the 20wt% of total fuel used in coal-burning boiler, reburning zone 3
Excess air factor be 0.8；
Modified compound coal dust is in powder fluidization device 8 through fluidizing gas, the progress height in high pressure draught dispersal device 9
Pressure gas stream dispersion, electrostatic dispersion device 10 spray into reburning zone after carrying out electrostatic dispersion；
The compound coal dust of modification includes coal dust, urea, sodium bicarbonate, powdered biomass and waste plastics inferior, wherein bad
Matter coal dust accounting 87wt%, urea and sodium bicarbonate accounting 10wt%, powdered biomass and waste plastics accounting 3wt%, colm
Powder is high-sulfur coal dust；
The preparation method of the compound coal dust of modification the following steps are included:
(a) colm is subjected to powder processed after primary breakup to partial size < 5mm, obtains 100 μm of partial size < of coal dust inferior；
(b) powder processed will be carried out after the group lease making primary breakup in the compound coal dust of modification in addition to colm to partial size < 5mm,
Obtain 50 μm of partial size < of additive powder；
(c) modified complex coal is obtained after mixing coal dust inferior obtained by step (a) with additive powder described in step (b)
Powder.
Inner flue gas of the stove desulphurization denitration is carried out using system and method described in the present embodiment, the synthesis denitration efficiency of flue gas reaches
To 83%.
Embodiment 2:
Present embodiments provide system and its processing method that a kind of modified coal fires desulphurization denitration again, the result of the system
Referring to structure in embodiment 1, difference is only that feeding material component 13 is chain transfer.
The processing method is only that referring to method in embodiment 1, difference: being total fuel in the fuel that primary zone is passed through
72wt%, the primary air flow being passed through are 40% of theoretical air requirement volume needed for primary zone is burnt, the dosage of modified compound coal dust
For the 11wt% of total fuel used in coal-burning boiler, the excess air factor of reburning zone is 0.7；Poor quality coal dust used is lignite coal
Powder；Colm is carried out powder processed after primary breakup to partial size < 2mm by step (a) in the preparation of modified compound coal dust, obtains grain
50 μm of diameter < of coal dust inferior；Step (b) is by the group lease making primary breakup in the compound coal dust of modification in addition to colm to partial size
Powder processed is carried out after < 2mm, obtains 10 μm of partial size < of additive powder.
Inner flue gas of the stove desulphurization denitration is carried out using system and method described in the present embodiment, the synthesis denitration efficiency of flue gas reaches
To 80%.
Embodiment 3:
Present embodiments provide system and its processing method that a kind of modified coal fires desulphurization denitration again, the result of the system
Referring to structure in embodiment 1.
The processing method is only that referring to method in embodiment 1, difference: being total fuel in the fuel that primary zone is passed through
90wt%, the primary air flow being passed through are 58% of theoretical air requirement volume needed for primary zone is burnt, the dosage of modified compound coal dust
For the 30wt% of total fuel used in coal-burning boiler, the excess air factor of reburning zone is 0.9；Poor quality coal dust used is lignite coal
Powder；Colm is carried out powder processed after primary breakup to partial size < 2mm by step (a) in the preparation of modified compound coal dust, obtains grain
10 μm of diameter < of coal dust inferior；Step (b) is by the group lease making primary breakup in the compound coal dust of modification in addition to colm to partial size
Powder processed is carried out after < 2mm, obtains 5 μm of partial size < of additive powder.
Inner flue gas of the stove desulphurization denitration is carried out using system and method described in the present embodiment, the synthesis denitration efficiency of flue gas reaches
To 81%.
Embodiment 4:
Present embodiments provide system and its processing method that a kind of modified coal fires desulphurization denitration again, the result of the system
Referring to structure in embodiment 1, difference is only that: coal-burning boiler is coal-powder boiler.
The processing method is only that referring to method in embodiment 1, difference: the primary air flow that primary zone is passed through does not have volume
Limitation.
Inner flue gas of the stove desulphurization denitration is carried out using system and method described in the present embodiment, the denitration efficiency of flue gas reaches
78%.
Embodiment 5:
The processing method that a kind of modified coal fires desulphurization denitration again is present embodiments provided, the processing method is referring to embodiment
Method in 1, difference are only that: the compound coal dust of the modification of the reburning zone only sprays into reburning zone by Laval nozzle, and no longer
It is sprayed using the compound coal dust spraying system of modification.
Inner flue gas of the stove desulphurization denitration is carried out using system and method described in the present embodiment, the denitration efficiency of flue gas is 60%
Left and right.
Comparative example 1:
This comparative example provides the processing method that a kind of modified coal fires desulphurization denitration again, and the processing method is referring to embodiment
Method in 1, difference are only that: the fuel for spraying into reburning zone is only smut coal dust and is not added with other additives.
Inner flue gas of the stove desulphurization denitration is carried out using the system and method described in this comparative example, the denitration efficiency of flue gas is only
30% or so.
Comparative example 2:
This comparative example provides the processing method that a kind of modified coal fires desulphurization denitration again, and the processing method is referring to embodiment
Method in 1, difference are only that: the fuel for spraying into reburning zone is not superfine composite coal dust, i.e., merely through tasting broken obtained coal
Powder, i.e. partial size are grade.
Inner flue gas of the stove desulphurization denitration is carried out using the system and method described in this comparative example, the denitration efficiency of flue gas is only
30% or so.
It can be seen that the present invention with comparative example based on the above embodiments and prepare microfine coal using tinpot coal, be not only
It fires again and provides ideal reburning fuel, and create effective way for the effective use of tinpot coal, and utilize and be added to
Add agent and the microfine coal with high volatile, fired coal combustion situation can be promoted, reduce fly ash combustible material, improves boiler effect
Rate；Meanwhile after the coal dust in microfine coal is mixed with other components, coal dust can play the role of dispersing agent, to effectively change
The flow behavior of kind superfine powder.
The Applicant declares that the present invention is explained by the above embodiments detailed process equipment and process flow of the invention,
But the present invention is not limited to the above detailed process equipment and process flow, that is, it is above-mentioned detailed not mean that the present invention must rely on
Process equipment and process flow could be implemented.It should be clear to those skilled in the art, any improvement in the present invention,
Addition, selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention etc., all fall within of the invention
Within protection scope and the open scope.
Claims (10)
1. the system that a kind of modified coal fires desulphurization denitration again, which is characterized in that the system comprises coal-burning boiler and modification are compound
Coal dust spraying system, wherein the burner hearth of coal-burning boiler includes successively from the bottom to top primary zone, reburning zone and burning-out zone, in reburning zone
The furnace wall at place is equipped with modified compound coal dust and spurts into mouth, and after-flame air port is equipped on the furnace wall above reburning zone, and modification is compound
The material outlet of coal dust spraying system spurts into mouth with modified compound coal dust and is connected.
2. system according to claim 1, which is characterized in that institute's coal-burning boiler is circulating fluidized bed boiler；
Preferably, when coal-burning boiler is circulating fluidized bed boiler, primary zone is Fluidized Boiler Bed layer emulsion zone；
Preferably, after-flame air port is equipped on the furnace wall between reburning zone and burning-out zone；
Preferably, overfiren air port is equipped in reburning zone.
3. system according to claim 1 or 2, which is characterized in that the compound coal dust spraying system of modification includes powder
Fluidizer, high pressure draught dispersal device, electrostatic dispersion device and powder output device；Wherein, powder fluidization device side wall is set
There is modified compound coal dust feed inlet, powder fluidization bottom of device is equipped with gas access, goes out at the top of powder fluidization device equipped with material
Mouthful, material outlet is connected with the material inlet of high pressure draught dispersal device；The material outlet and electrostatic of high pressure draught dispersal device
The material inlet of dispersal device is connected, the material outlet of electrostatic dispersion device and the material outlet of powder output device, and powder is defeated
The material outlet of device spurts into mouth with the compound coal dust of modification on the furnace wall of coal-burning boiler reburning zone and is connected out.
4. system according to claim 3, which is characterized in that the compound coal dust feed inlet of the modification of the powder fluidization device
The modified compound coal dust feeding device of connection；
Preferably, the compound coal dust feeding device of the modification includes modified compound coal dust storage tank and feeding material component, and storage tank is by sending
Material component is connect with modified compound coal dust feed inlet；
Preferably, the feeding material component includes screw delivery pump and/or chain transfer；
Preferably, the powder fluidization device includes powder fluidization bed；
Preferably, the high pressure draught dispersal device includes gas pipeline, and high pressure gas nozzle is arranged in gas pipeline end；
Preferably, the system also includes gas heat drying device, the gas vents and powder of the gas heat drying device
The gas access of body fluidizer is connected with the gas pipeline entrance of high pressure draught dispersal device；
Preferably, between the gas vent of the gas heat drying device and the gas pipeline entrance of high pressure draught dispersal device
Pressure conveying assembly is set；
Preferably, the pressure conveying assembly includes high pressure blower, and discharge pressure is 80kPa~100kPa.
5. system according to claim 3, which is characterized in that the electrostatic dispersion device includes charged needle, charged needle branch
Frame, insulation tube, ground loop and power supply, wherein charged needle and charged needle rack are placed in insulation tube, charged needle and charged needle rack
Vertically and it is connected, charged needle rack is fixed in insulation tube, and ground loop is around encirclement insulation tube, power supply and charged needle rack phase
Even；
Preferably, the powder output device includes Laval nozzle.
6. a kind of processing method of the described in any item systems of claim 1-5, which is characterized in that the method includes following steps
It is rapid:
Fuel is passed through in the primary zone of coal-burning boiler and First air forms single-stage combustion area, is sprayed into and is changed in the reburning zone of coal-burning boiler
The compound coal dust of property and Secondary Air are fired again, then the flue gas after firing enters burning-out zone and burnout degree catalytic combustion.
7. processing method according to claim 6, which is characterized in that the fuel being passed through in primary zone is total fuel
70wt%~90wt%；
Preferably, when coal furnace is circulating fluidized bed boiler, the primary zone of the coal-burning boiler is bed emulsion zone, is passed through
Primary air flow be 40%~60% of theoretical air requirement volume needed for primary zone is burnt.
8. method according to claim 6 or 7, which is characterized in that the dosage of the compound coal dust of modification is coal-burning boiler
10wt%~30wt% of total fuel used；
Preferably, the excess air factor of the reburning zone is 0.7~0.9；
Preferably, the compound coal dust of the modification sprays into reburning zone by modified compound coal dust spraying system；
Preferably, the compound coal dust of the modification successively sprays into reburning zone after fluidization, high pressure draught dispersion and electrostatic dispersion；
Preferably, the fluidization carries out in powder fluidization device；
Preferably, the gases used air for by heating in the fluidizing gas；
Preferably, the temperature of the air by heating is 60 DEG C~90 DEG C；
Preferably, flow velocity gases used in the fluidizing gas is 3m/s~5m/s；
Preferably, the high pressure draught is dispersed in high pressure draught dispersal device and carries out；
Preferably, the pressure of high pressure draught used is 80kPa~100kPa in high pressure draught dispersion；
Preferably, high pressure draught used is into the air crossed after heating in high pressure draught dispersion, and temperature is 60 DEG C~90
℃；
Preferably, the electrostatic dispersion carries out in electrostatic dispersion device；
Preferably, power supply applied in the electrostatic dispersion is high voltage power supply, and voltage is 50kV~90kV；
Preferably, electric current is 6mA~8mA in the electrostatic dispersion；
Preferably, the output is carried out by powder output device；
Preferably, the powder output is sprayed using Laval nozzle.
9. according to the described in any item methods of claim 6-8, which is characterized in that the compound coal dust of modification includes colm
Powder, nitrogenous reagent and desulfurizing agent, wherein the content of coal dust inferior is 85wt%~90wt%；
Preferably, the compound coal dust of the modification further includes any one in powdered biomass, waste plastics or mercury removal agent or at least two
Kind combination, any one in powdered biomass, waste plastics or mercury removal agent or at least two combined additive amount modified multiple
The accounting closed in coal dust is less than 5wt%；
Preferably, the coal dust inferior includes high-sulfur coal dust and/or brown coal powder；
Preferably, sulfur content is greater than 1wt% in the high-sulfur coal dust；
Preferably, the nitrogenous reagent is urea and/or bio-feritlizer；
Preferably, the desulfurizing agent includes any one in calcium hydroxide, sodium bicarbonate, sodium hydroxide, sodium sulphate or sodium sulfite
Or at least two combination；
Preferably, the powdered biomass is made by biological particles, and wherein biological particles include pine, wood shavings, stalk, rice
Any one in grass, rice husk, peanut shell, corncob, oil tea shell or cotton seed hulls or at least two combination；
Preferably, the compound coal dust of the modification is superfine modified compound coal dust, wherein 100 μm of partial size < of coal dust inferior, preferably
It is 50 μm of <, further preferably 10 μm of <；
Preferably, the partial size of inferior coal dust is greater than the partial size of remaining component in the compound coal dust of the modification；
Preferably, except coal dust inferior is with 50 μm of partial size < for remaining component, preferably 10 μm of < in the compound coal dust of the modification,
Further preferably 5 μm of <.
10. the method according to claim 6, which is characterized in that the preparation method of the compound coal dust of modification
The following steps are included:
(a) colm is carried out to powder processed after primary breakup, obtains coal dust inferior；
(b) powder processed will be carried out after the group lease making primary breakup in the compound coal dust of modification in addition to colm, obtains additive powder；
(c) it obtains being modified compound coal dust after mixing coal dust inferior obtained by step (a) with additive powder described in step (b)；
Preferably, step (a) primary breakup is to partial size < 5mm, preferably partial size < 2mm；
Preferably, step (a) powder processed is to 100 μm of partial size <, preferably 50 μm of <, further preferably 10 μm of <；
Preferably, step (b) primary breakup is to partial size < 5mm, preferably partial size < 2mm；
Preferably, step (b) powder processed is to 50 μm of partial size <, preferably 10 μm of <, further preferably 5 μm of <.
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Application publication date: 20190611 |