CN106318515A - In-furnace denitrification method and device - Google Patents
In-furnace denitrification method and device Download PDFInfo
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- CN106318515A CN106318515A CN201610706273.7A CN201610706273A CN106318515A CN 106318515 A CN106318515 A CN 106318515A CN 201610706273 A CN201610706273 A CN 201610706273A CN 106318515 A CN106318515 A CN 106318515A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L10/00—Use of additives to fuels or fires for particular purposes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
-
- 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
- F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
-
- 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
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
Abstract
The invention discloses an in-furnace denitrification coal water slurry making and combusting system integrated method and equipment. The method comprises the following steps: on the basis of the traditional slurry making process, adding a denitrification reducing agent, and preparing coal water slurry fuel containing the denitrification reducing agent; spraying the coal water slurry fuel into a boiler for burning, controlling the combustion temperature of the hearth to be stabilized in an optima reduction reaction temperature range and controlling the oxygen content of the flue gas, so that high-efficiency low-cost in-furnace SNCR denitrification of the coal water slurry is realized. The whole device comprises a coal water slurry combustion boiler, wherein the coal water slurry combustion boiler adopts the design of a primary combustion chamber and a secondary combustion chamber and is respectively provided with an axial cyclone primary combustor and a secondary combustor; a fire barrier is arranged at the tail of the primary combustion chamber, an air door is arranged below the primary combustion chamber, the rear upper part of the primary combustion chamber is connected with a dust remover through a pipeline, and the combusted smoke dust is discharged through an induced draft fan connected with the dust remover; and the axial cyclone primary combustor and the secondary combustor are respectively connected with a coal water slurry tank through a screw pump via pipelines, and are also respectively connected with an air compressor at the coal water slurry inlet through pipelines.
Description
Technical field
The present invention relates to the method and apparatus of a kind of water-coal-slurry denitration, the water-coal-slurry slurring of a kind of denitration in the stove and
Combustion system integrated processing method and equipment, belong to water coal slurry combusting technology field.
Background technology
Water-coal-slurry be the seventies rise a kind of low stain, high efficiency, can pipeline conveying generation oil coal based fluid fuel.It is
By the coal of about 65%, the water of about 34% and the chemical addition agent of about 1%, process through certain technological process, its ash
Dividing and sulfur content is low, during burning, flame kernel temperature is relatively low, and efficiency of combustion is high, flue dust, SO2And NOXDischarge capacity be below fuel oil and
Coal-fired.COAL-WATER SLURRY TECHNOLOGY has been listed in China's energy development emphasis promotional technique at present, is also that coal industry clean coal technology is excellent
One of first development priority technology.
Water-coal-slurry is in the combustion process of boiler or can produce substantial amounts of NOXDeng dusty gas, if be not acted upon
Directly discharge, then can be converted into PM2.5, serious environment pollution, it is therefore necessary to the in addition denitration to water-coal-slurry processes.
Dry denitration technology is current industrial research, the main flow of application and developing direction.Dry denitration refers in the gas phase
Utilize reducing agent or the means such as high-power electron beam, microwave, NOx is reduced into the N2 to environment nonhazardous effect or is converted into nitric acid
Salt is recycled.Dry denitration technology include selective catalytic reduction (SCR), non-selective catalytic reduction (SCNR),
SCR-SNCR mixing denitration method etc..
Dry denitration technology includes that selective catalytic reduction (SCR) technique is the flue gas that current business is most widely used
Denitration technology, is developed by Eegelhard company of the U.S..The method is to utilize NH3 for reducing agent, and NOx is reduced into N2.NH3 has
Selectivity, it only reacts with NO, and does not reacts with the oxygen in flue gas, and the optimal reaction temperature scope of NH3 with NO is
900 ~ 1000 DEG C, after using catalyst, temperature can be controlled at 300 ~ 400 DEG C, be suitable for boiler economizer and air preheater
Between flue gas scope, catalyst need to be added.
Non-selective catalytic reduction (SCNR) denitrating technique be by containing NHx base reducing agent (as ammonia, ammonia or
Person's carbamide etc.) spray into the region that fire box temperature is 900～1100 DEG C, reducing agent is by being arranged on the spray in pendant superheater region
Rifle sprays into, and this reducing agent rapid thermal decomposition becomes NH3 and other by-product, and to carry out SNCR anti-for NH3 and the NOx in flue gas subsequently
Answer and generate N2 and H2O.SNCR is widely used during current NOx administers and has one of promising denitration in the stove technology.
SNCR-SCR mixing denitrating technique has played the advantage that SNCR technology investment saves, SCR technique denitration efficiency is high,
The reducing agent of SNCR technique sprays into burner hearth technology carry out catalytic reaction with SCR technology utilization escape ammonia and combine, enter
One-step removal NOx.Mixing denitrating technique, using carbamide as absorbent, is that a kind of special SNCR technique is succinct with one in stove
Rear end SCR Benitration reactor effectively combine.
But in above-mentioned technology, although flue gas reduction removing NOx effect is obvious, but equipment investment and operating cost are big,
Can't be widely popularized and use at present.Low-NOx combustor can make NOx discharge reduce by 60%, but be likely to result in burning simultaneously
Efficiency decline, Boiler Furnace slagging and high temperature corrosion.Although fuel type NOx and thermal NO x is had an impact by low excess air coefficient, but
Excess air coefficient is the lowest can increase chemistry and the incomplete heat loss of machinery；Excess air coefficient is excessive can bring again reduction unfavorable
Result；Air classification technology exists that efficiency of combustion is low and the slagging scorification of fuel-rich region and etching problem；Deep or light deviation and flue gas are again
The NOx reduction that circulation obtains is inefficient.Spraying into the SNCR technology of ammonia, carbamide reducing agent in stove, equipment investment is big, 10 tons/
Hour coal water slurry boiler, equipment investment is offered 1,100,000 yuan, is almost accounted for three/the last mono-of boiler equipment gross investment.Denitration type water
Coal slurry, does not has corresponding combustion equipment and control technique thereof supporting, and denitration in the stove reduction reaction can not reach perfect condition, desulfurization
Efficiency, efficiency of combustion are difficult to ensure that with burn-off rate.The most still need to be improved further.
The patent literature of scheme constructed with the present invention not yet it is found to have, with the present invention by domestic patent retrieval
Closest to Patents, mainly have the most several:
1, number of patent application is CN201110405258.6, and patent name is " water-coal-slurry suspension fluidization desulphurization and denitration burner
Skill " patent of invention disclose a kind of coal water slurry fuel desulphurization and denitration technique, comprise the following steps: the pretreatment of water-coal-slurry, to
Water-coal-slurry adds denitrfying agent；Tiling bed media are on air distribution plate, and bed media include quartz sand, and its thickness is 300-
500mm；Water-coal-slurry described in step one is injected sowing device, in sowing device, the most also injects the desulfurizing agent of liquid, water-coal-slurry and
After desulfurizing agent mixes in sowing device, sowing device uniformly sow combustor；First air from high pressure positive blower opens in igniting
Time dynamic, igniter heats become heat smoke；Bed is heated to 400-500 DEG C by described heat smoke, and by air distribution plate by bed
Water-coal-slurry described in media and step 3 is sowed the cluster of grains of formation and is upwards blown afloat, and forms fluidized state；Sow on bed media
The cluster of grains of water-coal-slurry under the heating of fluidized state bed media, separate out rapidly moisture, thus ignition, its temperature of burning
Degree reaches 900-1000 DEG C, and this invention carries out pretreatment to water-coal-slurry, adds denitrfying agent, it is achieved good denitration effect, denitration
Rate is up to 60%, while water-coal-slurry is sowed, adds the desulfurizing agent of liquid, it is achieved good desulfurized effect, and desulfurization degree is up to
70%。
2, number of patent application is CN201210534303.2, and patent name is " water-coal-slurry suspension fluidization high-efficiency desulfurization denitration
Dedusting combination process " patent of invention disclose a kind of Water-coal-slurry suspension fluidization efficient desulfurization denitrification dust removal compound technology, including
Following steps: step 1, pretreatment, bunker coal coal-grinding washing process adds desulfurizing agent, the bunker coal processed is made water
Coal slurry, adds denitrfying agent in pulping process and stirs；Step 2, burning, the water-coal-slurry processed is passed through slurry feeding device
Being delivered to the combustor of boiler, and sow and burn, the temperature in combustor controls at 900-1000 DEG C；Step 3, at flue gas
Reason, flue gas burning produced is sent into high energy electrode desulfurating dust-removing equipment, is provided with high pressure in this high energy electrode desulfurating dust-removing equipment
Electrostatic potential source and power electrode, thus form the corona magnetic field that can gather molecule and ionized oxygen molecule in flue gas, this side
Case is to process flue dust, SO at process synthesises such as water-coal-slurry making, suspension fluidization burning, vent gas treatment2With pollutant such as NOx.
3, number of patent application is CN201210387330.1, and patent name is " combusting coal water slurry slag tap cyclone furnace classification
Air distribution and the method firing low NOx again " patent of invention disclose a kind of low NOx combusting technology, it is provided that a kind of combusting coal water slurry liquid
Deslagging cyclone furnace staged air distribution and the method firing low NOx again.It is to set burner on the top of columned body of heater, the master of burner
Body has the preignition zone of hollow；Above preignition zone, set water-coal-slurry entrance and First air entrance, burner wall sets secondary wind spray
Mouthful；Burner hearth in body of heater is divided into primary zone, reburning zone and burning-out zone from top to bottom, on primary zone sets tangential overfire air port and
The most tangential overfire air port, reburning zone sets reburning fuel spout, and burning-out zone sets fire air nozzle；The flue gas that burning is formed is from burner hearth
The exhanst gas outlet of bottom sides is discharged, and the liquid slag that burning produces is discharged from the slag notch of burner hearth bottom.The present invention is by selecting
Slag tap cyclone furnace, and run staged air distribution and reburning technology in combustion, reduce the NOx emission of 60%；Each air distribution
The setting of spout, make the ignition energy of water-coal-slurry by the simplest and most economical in the way of carry out.
The certain methods of denitration when though above patent proposes cool water mixture burning, but still there is equipment investment and running cost
With greatly, the problem such as efficiency of combustion declines, Boiler Furnace slagging and high temperature corrosion；And do not have corresponding combustion equipment and control technique thereof to join
Set, denitration in the stove reduction reaction can not reach perfect condition, and desulfuration efficiency, efficiency of combustion are difficult to ensure that with burn-off rate, at present also
Can not be widely popularized and use.
Summary of the invention
It is an object of the invention to the problem in the presence of processing for current water-coal-slurry denitration, it is provided that in a kind of stove
The method of SNCR denitration, the method can realize the high efficiency, low cost denitration of water-coal-slurry.
It is a further object to provide water-coal-slurry slurring and the combustion system integrated equipment of a kind of denitration in the stove, directly
Connect the high efficiency, low cost denitration realizing water-coal-slurry.
The scheme realizing the technology of the present invention is: a kind of method of denitration in the stove, takes water-coal-slurry slurring and combustion system collection
Become realizes denitration in the stove；On the Process ba-sis that existing water-coal-slurry slurring adds dispersant, stabilizer, add denitration reduction
Agent, makes the coal water slurry fuel containing denitrification reducing agent；Then this coal water slurry fuel is sprayed into the water-coal-slurry pot of main chamber burner hearth
Stove burns, and controls combustion temperature in hearth by system fading margin, stablizes and contains in preferable reduction reaction temperature scope and control flue gas
Oxygen amount, it is achieved SNCR denitration in the high efficiency, low cost stove of water-coal-slurry.
Further, the composition proportion of described coal water slurry fuel is as follows:
1) the de-ash coal 58-70% Han desulfurization
2) dispersant and stabilizer are 0.5-1%
3) denitrification reducing agent 1-10%
4) water 19-40.5%.
It is further, described that to make the coal water slurry fuel containing denitrification reducing agent be that to use concentration be 30-50% urea liquid
And/or high-concentration ammonia nitrogenous wastewater is as denitrification reducing agent, and it is modulated into together with desulfurization de-ash coal, dispersant, stabilizer and water
Coal water slurry fuel.
Further, described high-concentration ammonia nitrogenous wastewater accounting in whole water-coal-slurry is 8%-10%；Surplus water, or use
The Low Concentration Ammonia Containing Wastewater obtained by economic means is substituted.
Further, described dispersant anionic or non-ionic dispersing agent；Described stabilizer is inorganic salt, macromolecule
Organic compound, both mix according to arbitrary proportion.
Further, the described coal water slurry boiler burning that this coal water slurry fuel sprays into main chamber burner hearth refers to that equipment is transported
During row, start auxiliary burner, the water-coal-slurry containing denitrification reducing agent sprayed into subsidiary combustion chamber, after running continuously, start main burner,
Water-coal-slurry containing the denitrification reducing agent axial rotational flow main burner being arranged in main chamber is sprayed into leptosomic type main chamber stove
The coal water slurry boiler burning of thorax.
Further, when described equipment runs, start auxiliary burner, refer to first put into seasoned wood 5-8kg in subsidiary combustion chamber,
Ignition, treats that subsidiary combustion chamber temperature rises to the temperature that water-coal-slurry is flammable, starts auxiliary burner；Described continuous operating time is
20-30 minute.
Further, described combustion temperature in hearth and flue gas oxygen content control technique are to use to adjust air-introduced machine air quantity, pair
Chamber fuel ratio, secondary wind ratio realize；Described preferable reduction reaction temperature scope is 900 DEG C-1100 DEG C.
A kind of device of denitration in the stove, for water-coal-slurry slurring and combustion system integrated equipment, including boiler for burning coal slurry,
Boiler for burning coal slurry uses major and minor Combustion chamber design, is respectively configured axial rotational flow main burner and auxiliary burner；Main chamber
Afterbody is provided with firebreak, and lower section is provided with air door, and back upper place connects cleaner unit by pipeline, by drawing of being connected with cleaner unit
Flue dust after burning is discharged by blower fan；Axial rotational flow main burner and auxiliary burner pass through screw pump and water-coal-slurry with pipeline respectively
Tank connects, and meanwhile, axial rotational flow main burner and auxiliary burner are in its water-coal-slurry porch respectively by pipeline with air compressor machine even
Connect.
Further, described main chamber burner hearth uses leptosomic type version, it is possible to increase when high-temperature flue gas burner hearth stops
Between, it is achieved SNCR denitration in high efficiency, low cost stove；Described main chamber burner hearth length, width and height dimension scale relation 3-10:1:2-8, should
Scale determines with specific reference to boiler load size.
Further, within the scope of the height of described firebreak is the 0.5-2.5m up and down of main burner axis.
Further, described axial rotational flow main burner is positioned at above main chamber head side, and subsidiary combustion chamber is positioned under side
Side, auxiliary burner is in subsidiary combustion chamber side；Described major and minor burner axis direction is orthogonal, and subsidiary combustion chamber is main chamber
The 1/3-1/8 in space.
Denitration principle is as follows:
HCN, NH is produced after pyrolysis of coal3Deng nitrogen compound, nitrogen compound and oxygen reaction generate NO, NOx and mainly include about 95%
The NO of NO and about 5%2.Therefore, the discharge controlling NOx mainly controls the discharge of NO.Under the effect of nitrogen compound, NO
N can be reduced to again2, its overall reaction formula is as follows:
HCN/NH3 + O2 → NO + ...
NO + HCN/NH3 → N2 + ...
The invention has the beneficial effects as follows:
1, the method and equipment can comprehensively utilize high-concentration ammonia nitrogenous wastewater, it is achieved its recycling, realize water-coal-slurry combustion simultaneously
The high efficiency, low cost denitration burnt, is a kind of advanced, practical technique and equipment, has wide market application foreground.
2, system need not other auxiliary equipments such as deionized water water making device etc. when running, and burner hearth does not produce coking phenomenon
3, without increasing special denitration operation, it is possible to achieve preferably denitration effect, denitration rate is up to more than 60%.
Accompanying drawing explanation
Fig. 1 is the water-coal-slurry slurring of the denitration in the stove of the present invention and combustion system integrated approach and equipment schematic diagram；
Wherein: 1, water-coal-slurry tank；2, screw pump；3, air compressor machine；4, axial rotational flow main burner；5, auxiliary burner；6, secondary burning
Room；7, main chamber；8, air door；9, combustor firebreak；10, cleaner unit；11, air-introduced machine.
Detailed description of the invention
The present invention is further described below in conjunction with the accompanying drawings.
Embodiment one:
From accompanying drawing 1 it can be seen that the present invention relates to water-coal-slurry slurring and the combustion system integrated equipment of a kind of denitration in the stove, bag
Including boiler for burning coal slurry, boiler for burning coal slurry is divided into main chamber 7 and subsidiary combustion chamber 6；Wherein, main chamber 7 head
Being configured with axial rotational flow main burner 4 above side, side-lower is subsidiary combustion chamber 6, and subsidiary combustion chamber 6 side is configured with auxiliary burner 5,
And axial rotational flow main burner 4 is orthogonal at axis direction with auxiliary burner 5；Axial rotational flow main burner 4 and auxiliary burner 5
Being connected with water-coal-slurry tank 1 by screw pump 2 with pipeline respectively, meanwhile, axial rotational flow main burner 4 and auxiliary burner 5 are at Qi Shui
Coal slurry porch is connected with air compressor machine 3 by pipeline respectively；Having air door 8 below main chamber 7, afterbody has firebreak 9, back upper place
Connect cleaner unit 10 by pipeline, by the air-introduced machine 11 being connected with cleaner unit 10, the flue dust after burning is discharged.
Described main chamber 7 length, width and height dimension scale relation 3:1:2；Subsidiary combustion chamber 6 space is the 1/3 of main chamber 7；Gear
Within the scope of the height of wall with flues is for the 0.5-2.5m up and down of main burner axis.
Material rate by desulfurization de-ash coal 58%, dispersant and stabilizer be 0.5%, high-concentration ammonia nitrogenous wastewater 10-20%, water
30-40%, denitrification reducing agent 1-5%.
Dispersant use naphthalene sulfonate, lignosulfonates, sulfonation humic acid salt any one；Stabilizer uses polypropylene
Amide flocculant or carboxymethyl cellulose, both mix according to arbitrary proportion.
Denitrification reducing agent is high-concentration ammonia nitrogenous wastewater, and in waste water, ammonia-nitrogen content is at more than 500mg/l.
Concrete operations flow process is as follows:
Make the water-coal-slurry containing denitrification reducing agent according to traditional handicraft to be stored in water-coal-slurry tank 1；Seasoned wood is put in subsidiary combustion chamber 6
5kg, ignition, treat that subsidiary combustion chamber 6 temperature rises to the flammable temperature of water-coal-slurry (about 600-800oC), start pair burning
Device 5, sprays into subsidiary combustion chamber 6 by the water-coal-slurry burner 5 containing denitrification reducing agent, runs 20 minutes continuously, starts main burner
4, the water-coal-slurry axial rotational flow burner 4 containing denitrification reducing agent is atomized the water-coal-slurry spraying into leptosomic type main chamber 7 burner hearth
Boiler combustion, is controlled combustion temperature in hearth at about 900 DEG C by air compressor machine 3 and air door 8, and firebreak 9 increases high-temperature flue gas
Stop the response time in stove, it is achieved SNCR denitration in the high efficiency, low cost stove of water-coal-slurry.
Embodiment two
Embodiment two is the same with the principle of embodiment one, the most different；A kind of water coal of denitration in the stove
Slurry slurrying and combustion system integrated equipment, including boiler for burning coal slurry, boiler for burning coal slurry is divided into main chamber 7 and secondary combustion
Burn room 6；Wherein, being configured with axial rotational flow main burner 4 above the side of main chamber 7 head, side-lower is subsidiary combustion chamber 6, secondary
Combustor 6 side is configured with auxiliary burner 5, and axial rotational flow main burner 4 is orthogonal at axis direction with auxiliary burner 5；
Axial rotational flow main burner 4 is connected with water-coal-slurry tank 1 by screw pump 2 with pipeline respectively with auxiliary burner 5, axially revolves meanwhile
Stream main burner 4 is connected with air compressor machine 3 by pipeline in its water-coal-slurry porch respectively with auxiliary burner 5；Below main chamber 7
Having air door 8, afterbody has firebreak 9, and back upper place connects cleaner unit 10 by pipeline, by the air-introduced machine 11 being connected with cleaner unit 10
Flue dust after burning is discharged.
Material rate by desulfurization de-ash coal 70%, dispersant and stabilizer be 1%, water 30-40%, denitrification reducing agent 10%.
Dispersant uses naphthalene sulfonate；Stabilizer uses polyacrylamide flocculant, and both mix according to 1:1 ratio.
Denitrification reducing agent is 30-50% urea liquid.
Concrete operations flow process is as embodiment one.
Embodiment three
Embodiment two is the same with the principle of embodiment one, the most different；A kind of water coal of denitration in the stove
Slurry slurrying and combustion system integrated equipment, including boiler for burning coal slurry, boiler for burning coal slurry is divided into main chamber 7 and secondary combustion
Burn room 6；Wherein, being configured with axial rotational flow main burner 4 above the side of main chamber 7 head, side-lower is subsidiary combustion chamber 6, secondary
Combustor 6 side is configured with auxiliary burner 5, and axial rotational flow main burner 4 is orthogonal at axis direction with auxiliary burner 5；
Axial rotational flow main burner 4 is connected with water-coal-slurry tank 1 by screw pump 2 with pipeline respectively with auxiliary burner 5, axially revolves meanwhile
Stream main burner 4 is connected with air compressor machine 3 by pipeline in its water-coal-slurry porch respectively with auxiliary burner 5；Below main chamber 7
Having air door 8, afterbody has firebreak 9, and back upper place connects cleaner unit 10 by pipeline, by the air-introduced machine 11 being connected with cleaner unit 10
Flue dust after burning is discharged.
Material rate by desulfurization de-ash coal 65%, dispersant and stabilizer be 0.8%, high-concentration ammonia nitrogenous wastewater 10-20%, water
30-40%, denitrification reducing agent 1-5%.
Dispersant uses lignosulfonates；Stabilizer uses poly-carboxymethyl cellulose, and both mix according to arbitrary proportion.
Denitrification reducing agent is 30-50% urea liquid and/or high-concentration ammonia nitrogenous wastewater mixture, mixes according to the ratio of 1:2
Close.
Concrete operations flow process is as embodiment one.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
By above-described embodiment it can be seen that a kind of method that the invention still further relates to denitration in the stove, take water-coal-slurry slurring
And combustion system integrated realize denitration in the stove；On the Process ba-sis that existing water-coal-slurry slurring adds dispersant, stabilizer, add
Add denitrification reducing agent, make the coal water slurry fuel containing denitrification reducing agent；Then this coal water slurry fuel is sprayed into main chamber burner hearth
Coal water slurry boiler burning, and control combustion temperature in hearth by system fading margin, stable in preferable reduction reaction temperature scope and
Control flue gas oxygen content, it is achieved SNCR denitration in the high efficiency, low cost stove of water-coal-slurry.
Further, the composition proportion of described coal water slurry fuel is as follows:
1) the de-ash coal 58-70% Han desulfurization
2) dispersant and stabilizer are 0.5-1%
3) denitrification reducing agent 1-10%
4) water 19-40.5%.
It is further, described that to make the coal water slurry fuel containing denitrification reducing agent be that to use concentration be 30-50% urea liquid
And/or high-concentration ammonia nitrogenous wastewater is as denitrification reducing agent, and it is modulated into together with desulfurization de-ash coal, dispersant, stabilizer and water
Coal water slurry fuel.
Further, described high-concentration ammonia nitrogenous wastewater accounting in whole water-coal-slurry is 8%-10%；Surplus water, or use
The Low Concentration Ammonia Containing Wastewater obtained by economic means is substituted.
Further, the described coal water slurry boiler burning that this coal water slurry fuel sprays into main chamber burner hearth refers to that equipment is transported
During row, start auxiliary burner, the water-coal-slurry containing denitrification reducing agent sprayed into subsidiary combustion chamber, after running continuously, start main burner,
Water-coal-slurry containing the denitrification reducing agent axial rotational flow main burner being arranged in main chamber is sprayed into leptosomic type main chamber stove
The coal water slurry boiler burning of thorax.
Further, when described equipment runs, start auxiliary burner, refer to first put into seasoned wood 5-8kg in subsidiary combustion chamber,
Ignition, treats that subsidiary combustion chamber temperature rises to the temperature that water-coal-slurry is flammable, starts auxiliary burner；Described continuous operating time is
20-30 minute.
Further, described combustion temperature in hearth and flue gas oxygen content control technique are to use to adjust air-introduced machine air quantity, pair
Chamber fuel ratio, secondary wind ratio realize；Described preferable reduction reaction temperature scope is 900 DEG C-1100 DEG C.
Denitration principle is as follows:
HCN, NH is produced after pyrolysis of coal3Deng nitrogen compound, nitrogen compound and oxygen reaction generate NO, NOx and mainly include about 95%
The NO of NO and about 5%2.Therefore, the discharge controlling NOx mainly controls the discharge of NO.Under the effect of nitrogen compound, NO
N can be reduced to again2, its overall reaction formula is as follows:
HCN/NH3 + O2 → NO + ...
NO + HCN/NH3 → N2 + ...
The invention has the beneficial effects as follows:
1, the method and equipment can comprehensively utilize high-concentration ammonia nitrogenous wastewater, it is achieved its recycling, realize water-coal-slurry combustion simultaneously
The high efficiency, low cost denitration burnt, is a kind of advanced, practical technique and equipment, has wide market application foreground.
2, system need not other auxiliary equipments such as deionized water water making device etc. when running, and burner hearth does not produce coking phenomenon
3, without increasing special denitration operation, it is possible to achieve preferably denitration effect, denitration rate is up to more than 60%.
Claims (10)
1. the method for a denitration in the stove, it is characterised in that: take water-coal-slurry slurring and combustion system integrated realize in stove de-
Nitre；On the Process ba-sis that existing water-coal-slurry slurring adds dispersant, stabilizer, add denitrification reducing agent, make containing denitration also
The coal water slurry fuel of former dose；Then this coal water slurry fuel is sprayed into the coal water slurry boiler burning of main chamber burner hearth, and by being
Tracking joint controls combustion temperature in hearth, stablizes in reduction reaction temperature scope and controls flue gas oxygen content, it is achieved the height of water-coal-slurry
SNCR denitration in effect low cost stove.
2. the method for denitration in the stove as claimed in claim 1, it is characterised in that: the composition proportion of described coal water slurry fuel is such as
Under:
1) the de-ash coal 58-70% Han desulfurization
2) dispersant and stabilizer are 0.5-1%
3) denitrification reducing agent 1-10%
4) water 19-40.5%.
3. the method for denitration in the stove as claimed in claim 1, it is characterised in that: the described water coal made containing denitrification reducing agent
Slurry fuel be use concentration be 30-50% urea liquid and/or high-concentration ammonia nitrogenous wastewater as denitrification reducing agent, take off with containing desulfurization
Culm, dispersant, stabilizer are modulated into coal water slurry fuel together with water.
4. the method for denitration in the stove as claimed in claim 1, it is characterised in that: described high-concentration ammonia nitrogenous wastewater is at whole water coal
Accounting in slurry is 8%-10%；Surplus water, or substitute with the Low Concentration Ammonia Containing Wastewater obtained by economic means.
5. the method for denitration in the stove as claimed in claim 1, it is characterised in that: described this coal water slurry fuel is sprayed into main burning
The coal water slurry boiler burning of room burner hearth refers to when equipment runs, and starts auxiliary burner, the water-coal-slurry containing denitrification reducing agent is sprayed into
Subsidiary combustion chamber, after running continuously, starts main burner, by the water-coal-slurry containing denitrification reducing agent with being arranged in the axial of main chamber
Eddy flow main burner sprays into the coal water slurry boiler burning of leptosomic type main chamber burner hearth.
6. the method for denitration in the stove as claimed in claim 1, it is characterised in that: when described equipment runs, start auxiliary burner,
Refer to first put into seasoned wood 5-8kg, ignition in subsidiary combustion chamber, treat that subsidiary combustion chamber temperature rises to the temperature that water-coal-slurry is flammable
Degree, starts auxiliary burner；Described continuous operating time is 20-30 minute.
7. the method for denitration in the stove as claimed in claim 1, it is characterised in that: described combustion temperature in hearth and flue gas oxygen content
Control technique is to use adjustment air-introduced machine air quantity, subsidiary combustion chamber fuel ratio, secondary wind ratio to realize；Described reduction reaction temperature
Degree scope is 900 DEG C-1100 DEG C.
8. a device for denitration in the stove, for water-coal-slurry slurring and combustion system integrated equipment, including boiler for burning coal slurry, water
Slurry Combustion boiler uses major and minor Combustion chamber design, is respectively configured axial rotational flow main burner and auxiliary burner；Main chamber tail
Portion is provided with firebreak, and lower section is provided with air door, and back upper place connects cleaner unit by pipeline, by the air inducing being connected with cleaner unit
Flue dust after burning is discharged by machine；Axial rotational flow main burner and auxiliary burner pass through screw pump and water-coal-slurry tank with pipeline respectively
Connecting, meanwhile, axial rotational flow main burner is connected with air compressor machine by pipeline in its water-coal-slurry porch respectively with auxiliary burner.
9. the device of denitration in the stove as claimed in claim 1, it is characterised in that: described main chamber burner hearth uses leptosomic type knot
Configuration formula, it is possible to increase the high-temperature flue gas burner hearth time of staying, it is achieved SNCR denitration in high efficiency, low cost stove；Described main chamber burner hearth
Length, width and height dimension scale relation 3-10:1:2-8, this scale determines with specific reference to boiler load size.
10. the device of denitration in the stove as claimed in claim 1, it is characterised in that: the height of described firebreak is main burner
Within the scope of the upper and lower 0.5-2.5m of axis；Described axial rotational flow main burner is positioned at above main chamber head side, subsidiary combustion chamber
Being positioned at side-lower, auxiliary burner is in subsidiary combustion chamber side；Described major and minor burner axis direction is orthogonal, and subsidiary combustion chamber is
The 1/3-1/8 in main chamber space.
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| CN201610706273.7A CN106318515A (en) | 2016-08-23 | 2016-08-23 | In-furnace denitrification method and device |
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