CN110170239A - A kind of system and method for realizing green denitration using dry technology for production - Google Patents
A kind of system and method for realizing green denitration using dry technology for production Download PDFInfo
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- CN110170239A CN110170239A CN201910603645.7A CN201910603645A CN110170239A CN 110170239 A CN110170239 A CN 110170239A CN 201910603645 A CN201910603645 A CN 201910603645A CN 110170239 A CN110170239 A CN 110170239A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
- B01D53/565—Nitrogen oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
Abstract
The invention discloses a kind of system and methods that green denitration is realized using dry technology for production, including multistage cyclone cylinder, dore furnace, kiln tail smoke-box, rotary kiln and grate-cooler, the dore furnace lower part is equipped with denitration chamber, the spraying integrated device for spraying coal dust is equipped in the dore furnace, the spraying denitrator of steam and coal dust is equipped with while sprayed in the denitration chamber, the denitration chamber lower part is equipped with kiln tail smoke-box, the kiln tail smoke-box is connected with rotary kiln, the grate-cooler of rotary kiln end is equipped with Secondary Air and fan housing and tertiary air is taken to take fan housing, the Secondary Air takes fan housing connection grate-cooler and rotary kiln, the tertiary air takes fan housing to be set to Secondary Air and takes on rear side of fan housing, tertiary air takes fan housing connection grate-cooler and tertiary air air hose, the air outlet of the tertiary-air pipe is connected with dore furnace.The characteristics of system combination cement production process, optimizes technological design and process equipment, on the basis of ensuring high-efficiency high-quality production, reduces NO from the root completely with technological measureXGeneration, realize green it is out of stock.
Description
Technical field
The present invention relates to clinker production and its denitration fields, specifically a kind of to utilize novel dry-method cement clinker
Production technology realizes the system and method without ammonia green denitration.
Background technique
Current cement clinker production technology, during raw material decomposition and clinker burning, due to the high temperature in rotary kiln
Gas and a large amount of coal dust firing can all generate the NO of a large amount of heating power type and fuel typeX.Clinker burning in cement rotary kiln
Temperature is up to 1600 DEG C, therefore region (being much higher than 1300 DEG C) is burnt into rotary kiln, and what is primarily formed is thermal NOX,
Its major influence factors has temperature, oxygen concentration, gas residence time etc., incidentally generates some fuel type NOX, mainly influence because
Element is firing rate, propellant composition；Under the conditions of kiln tail, dore furnace region are lower than 1300 DEG C, fuel type NO is primarily formedX, shadow
Ring fuel type NOXThe factor of generation mainly has propellant composition, gas residence time, excess air coefficient etc., but in dore furnace
Region can seldom generate thermal NOX。
From the difference of cement industry nitrogen oxides formation mechenism, adapt to cement industry denitration technology it is general there are three types of: one
It is to control thermal NO from sourceXThe low nitrogen grading combustion technology generated, such as uses low NO, and control AIR Proportional is realized
Fractional combustion, control excess air coefficient make fuel burn in low-oxygen environment etc..Its denitration effect is by burning clinker of cement
Technique restricts, and denitration efficiency is generally acknowledged that stability is bad 15%~30%, generally as compounding technique, reduces initial NOX
Concentration of emission saves reducing agent consumption；Second is that SNCR denitration technology, SNCR method be under 850 DEG C~1000 DEG C of hot conditions,
It is sprayed into flue gas and contains NH3The reducing agent of base, by NOXIt is reduced into nitrogen and water.Technology NO in practical applicationsXRemoving
Rate is generally 50%~70% or so.Have that system is simple, construction investment is few, easy to operate the advantages of the method, disadvantage is to hold very much
Be also easy to produce the escaping of ammonia, increase operating cost, denitration efficiency be difficult to control etc..The NO generated in productionXAmmonia that are more, needing to spray into
Water is bigger, and the escaping of ammonia is more serious, forms new pollution, while increasing production cost；Third is that SCR denitration technology, SCR method are
Under certain catalytic reaction condition, contain NH with ammonia, urea etc.3The reducing agent of base is by the NO in flue gasXIt is converted into harmless nitrogen
And water.This method removes NOXIt is high-efficient, it can often reach 60%~90% or so in practical applications, be obtained extensively in power industry
Application, can be by station boiler NOXDischarge amount is down to 100mg/Nm3Hereinafter, still operating cost is more higher by compared with SNCR denitration technology
Much again, in the case where with regard to the low profit margin of current cement industry, cement production enterprise is difficult to bear, this is also that this technology can not be in water
The main reason for mud industry is promoted.
In three of the above denitration technology, the most commonly used is low nitrogen grading combustion technology and SNCR denitration skills for cement industry at present
The cooperation of art or two kinds of denitration technologies.
In order to preserve the ecological environment, sustainable development is realized.According to " cement industry atmosphere pollutants emission standards "
(GB4915-2013) cement industry NO is provided inXConcentration of emission is 400mg/Nm3, key area executes 200mg/Nm3Or even one
There has been minimum discharge standard 100mg/Nm in a little areas3.Most domestic enterprise passes through low nitrogen burning transformation, SNCR technology at present
The measures such as transformation can reduce to 200mg/Nm without considering the cost3Below.Power industry has been carried out " thermoelectricity
Factory's atmosphere pollutants emission standards " 100mg/Nm in (GB13223-2011)3Regulation, the discharge far below cement industry wants
It asks.It states and asks by national policy and the public, energy-saving and emission-reduction are that industry existence is basic, if country is higher to cement industry proposition
Emission reduction requirement, then the prior art can be very high with regard to hard to carry on or increased costs.So exploitation further decreases NOX
The new technology of discharge amount is with regard to extremely urgent.
Summary of the invention
The object of the present invention is to provide a kind of system and method that green denitration is realized using dry technology for production, the systems
In conjunction with the characteristics of cement production process, optimize technological design and process equipment, on the basis of ensuring high-efficiency high-quality production, completely
NO is reduced from the root with technological measureXGeneration, realize green denitration.The process reduces thermal NO from the rootXWith
Fuel type NOXFormation, kiln hood reduces with coal, but calcines ability and greatly enhance, and clinker quality significantly improves, and clinker is kept
Previous level slightly improves.
The technical scheme adopted by the invention to solve the technical problem is that: it is a kind of to realize that green is de- using dry technology for production
The system of nitre, including multistage cyclone cylinder, dore furnace, kiln tail smoke-box, rotary kiln and grate-cooler, characterized in that under the dore furnace
Portion is equipped with denitration chamber, and the spraying integrated device for spraying coal dust is equipped in the dore furnace, is equipped in the denitration chamber while spraying steaming
The spraying denitrator of vapour and coal dust, the denitration chamber lower part are equipped with kiln tail smoke-box, and the kiln tail smoke-box is connected with rotary kiln, return
The grate-cooler of rotary kiln kiln hood is equipped with Secondary Air and fan housing and tertiary air is taken to take fan housing, and the Secondary Air takes fan housing connection grate-cooler and returns
Rotary kiln, the tertiary air take fan housing to be set to Secondary Air and take on rear side of fan housing, and tertiary air takes fan housing connection grate-cooler and tertiary air air hose,
The air outlet of the tertiary-air pipe is connected with dore furnace.
Further, the multistage cyclone cylinder includes one cyclonic cylinder, second level cyclone cylinder, three-level cyclone cylinder, Category Four cyclone cylinder
Two-way is divided by material distributing valve with the discharge port of five-stage whirlwind cylinder, the Category Four cyclone cylinder, wherein discharge port is through feeder pipe all the way
It is connected with integrated device is sprayed with dore furnace, another way discharge port is connected through feeder pipe and spraying denitrator with denitration chamber.
Further, the Secondary Air takes fan housing and tertiary air that fan housing is taken to be independent cover respectively, and the Secondary Air takes wind
It covers close to rotary kiln discharging point, the tertiary air takes fan housing far from rotary kiln discharging point, and the secondary of extracting high-temperature wind takes fan housing to set
It is placed in kiln hood and is connected with rotary kiln and grate-cooler, the tertiary air for extracting medium temperature wind takes fan housing to be set to after Secondary Air takes fan housing
Side, tertiary air take fan housing to be connected to tertiary-air pipe and grate-cooler.
Further, the integrated device that sprays includes spreading case and the coal pipe for spraying coal dust, and the inside of the spreading case is sky
Chamber, coal pipe are set at spreading box cavity center, and coal pipe outlet end is equipped with deflector.
Further, the denitrator that sprays includes spreading case, sprays the coal pipe of coal dust and spray the vapor pipe of vapor,
The coal pipe is set to spreading box cavity center, and coal pipe outlet end is equipped with deflector, and coal pipe corresponds to two sides and is respectively equipped with vapor pipe.
Further, the tertiary-air pipe is equipped with tertiary air valve.
Further, the lower part of the denitration chamber is equipped with necking, and the top of kiln tail smoke-box is connect with the necking of denitration chamber bottom,
Temperature measuring equipment is equipped in the denitration chamber.
A method of green denitrating system is realized using dry technology for production, is included the following steps:
(1), the preheated device level-one of cold conditions raw material enters dore furnace to after preheating between Category Four cyclone cylinder, in Category Four cyclone cylinder
Material, which runs out of steam, after the separation of interior fertilizer is divided into two strands by material distributing valve downwards, above one enter in dore furnace, below it is another
After stock enters denitration chamber, coal dust and vapor by pipeline feeding spraying denitrator, entered in denitration chamber by the pressure of wind,
Coal dust, vapor and a small amount of O to come out of rotary kiln in denitration chamber2It chemically reacts, to eliminate the big of the interior generation of kiln
Measure NOXAnd the fuel type NO that coal dust generatesX；
(2), enter after dore furnace and denitration chamber all can be by wind with being upwardly into dore furnace for material, while coal dust also leads to
Spraying integrated device is crossed to enter in dore furnace, the burning of coal dust brings heat to the decomposition of material, simultaneously because coal dust and material with
And a large amount of high temperature pure airs to come through tertiary-air pipe are mixed and burned, the material after decomposition enters five-stage whirlwind cylinder through dore furnace
Conveyance afterwards, material, which runs out of steam, enters rotary kiln via kiln tail smoke-box downwards；
(3), entering in kiln by the material of decomposition becomes clinker by high-temperature calcination, and into grate-cooler, grate-cooler has greatly
It measures cold wind to enter, to be quickly cooled down clinker, cold wind also largely absorbs the heat of clinker, grate-cooler system while cooling down clinker
High temperature wind after the heating of system front end takes fan housing to enter in rotary kiln by Secondary Air, provides O to coal dust firing in rotary kiln2And heat
Amount, behind a large amount of medium temperature wind take fan housing to enter in dore furnace through tertiary-air pipe by tertiary air, to the coal dust combustion in dore furnace
It burns and O is provided2And heat.
Further, tertiary-air pipe is equipped with tertiary air valve, can flexibly adjust rotary kiln and dore furnace by valve
Air feed balance.
Beneficial effects of the present invention:
1, the present invention reduces thermal NO from the rootXWith fuel type NOXFormation, kiln hood reduces with coal, but calcines ability
It greatly enhances, clinker quality significantly improves, and clinker keeps previous level or slightly improves.It is applicable not only to newborn producing line
Construction is also applied for the transformation of existing cement producing line, and construction is simple, investment is less, does not reduce existing production and technical indication, also
It can increase.There are wide application space, huge market value and social value.
2, wind coal charge is reasonably distributed in denitration chamber and dore furnace, is uniformly mixed, and process stabilizing, denitration efficiency is reliable and stable,
The thermal NO that can will be generated in art production processXWith fuel type NOXIt eliminates, and ensures in dore furnace without office as far as possible
The technological problems for all kinds of influence steady productions that portion's high temperature generates.
3, in the case where not adding any chemical denitrfying agent, NO may be implementedXInitial value discharge is less than 300mg/Nm3.It is green
Color denitrating technique technology combines with SNCR system, can be real using micro ammonium hydroxide (ammonium hydroxide usage amount is less than 3kg/t clinker)
Existing system NOXConcentration of emission is lower than 50mg/Nm3。
4, the escape amount for reducing the ammonium hydroxide in denitrification process, reduces the pollution to environment, reduces production cost.?
NOXCon trolling index is less than 300mg/Nm3Region, compared with other normal mean levels, at least reduce by 70% or so ammonium hydroxide use
Amount；In NOXCon trolling index is not more than 300mg/Nm3Region, the denitrfying agents such as any ammonium hydroxide can not had to.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram for spraying denitrator；
Fig. 3 is the structural schematic diagram for spraying integrated device.
In figure:
1 grate-cooler, 2 tertiary airs take fan housing, 3 Secondary Airs to take fan housing, 4 rotary kilns, 5 tertiary-air pipes, 6 tertiary air valves, 7 kilns
Denitrator, 12 spraying integrated devices, 13 five-stage whirlwind cylinders, 14 level Four are sprayed in tail smoke-box, 8 denitration chambers, 9 dore furnaces, 10 material distributing valves, 11
Cyclone cylinder, 15 spreading casees, 16 coal pipes, 17 vapor pipes.
Specific embodiment
Referring to Figure of description to a kind of system and method for realizing green denitration using dry technology for production of the invention
It is described in detail below.
As shown in Figure 1, a kind of system for realizing green denitration using dry technology for production of the invention, including multistage cyclone
Cylinder, dore furnace 9, kiln tail smoke-box 7, rotary kiln 4 and grate-cooler 1,9 lower part of dore furnace are equipped with denitration chamber 8, the dore furnace 9
It is interior to be equipped with the spraying integrated device 12 for spraying coal dust, the spraying denitrator of steam and coal dust is equipped with while sprayed in the denitration chamber 8
11,8 lower part of denitration chamber is equipped with kiln tail smoke-box 7, and the kiln tail smoke-box 7 is connected with rotary kiln 4, the comb of 4 kiln hood of rotary kiln
Cold 1 is equipped with Secondary Air and fan housing 3 and tertiary air is taken to take fan housing 2, and the Secondary Air takes fan housing 3 to connect grate-cooler 1 and rotary kiln 4,
The tertiary air takes fan housing 2 to be set to Secondary Air and takes 3 rear side of fan housing, and tertiary air takes fan housing 2 to connect grate-cooler 1 and tertiary air air hose 5,
The air outlet of the tertiary-air pipe 5 is connected with dore furnace 9.Dore furnace is made of cylinder and tapering, dore furnace tapering and de-
Nitre room is connected.
Multistage cyclone cylinder includes one cyclonic cylinder, second level cyclone cylinder, three-level cyclone cylinder, Category Four cyclone cylinder and five-stage whirlwind
Cylinder, the discharge port of the Category Four cyclone cylinder 14 is divided by material distributing valve 41 for two-way, wherein discharge port is through feeder pipe and spraying all the way
Integrated device 12 is connected with dore furnace 9, and another way discharge port is connected through feeder pipe and spraying denitrator 11 with denitration chamber 8.
It sprays denitrator 11 and is arranged in 8 lower part of denitration chamber, and only one layer, be then arranged symmetrically if it is bi serie preheater
On denitration chamber lower horizontal cross section.It sprays integrated device and is arranged in tertiary air air hose top on dore furnace cylinder, and only one
Layer, is then arranged symmetrically on denitration chamber lower horizontal cross section if it is bi serie preheater.
Secondary Air takes fan housing 3 and tertiary air that fan housing 2 is taken to be independent cover respectively, and the Secondary Air takes fan housing close to revolution
4 discharging point of kiln, the tertiary air take fan housing far from rotary kiln discharging point, and the secondary of extracting high-temperature wind takes fan housing to be set to kiln hood simultaneously
It is connected with rotary kiln and grate-cooler, the tertiary air for extracting medium temperature wind takes fan housing to be set to Secondary Air and takes the rear side of fan housing, and three times
Air hose 5 is connected to grate-cooler 1.The tertiary-air pipe is equipped with tertiary air valve 6.
Original Secondary Air and tertiary air use the same kiln head cover, are all taken from the mixed of grate-cooler high temperature wind and medium temperature wind
Wind is closed, since Secondary Air and tertiary air require difference to technique, Secondary Air needs temperature high, and the enough air quantity of tertiary air needs are
It can.It is shunted again after grate-cooler high temperature wind and the mixing of medium temperature wind, the wind-warm syndrome into kiln Secondary Air is virtually reduced, before having influenced kiln
The temperature of coal consumption and flame.Origin of heat is the heat of the Secondary Air bring heat and coal dust firing that come from grate-cooler in kiln
Amount in the case that calcination of chamotte institute calorific requirement is constant, improves Secondary Air temperature not only due to increasing heat to reduce coal dust
Calory burning, and coal dust firing can be made more abundant, kiln hood coal consumption can be substantially reduced, kiln hood coal consumption is reduced, required
Air quantity can also be reduced, and air quantity has lacked the thermal NO generatedXAlso it can reduce.The technology starting point for improving secondary air temperature is exactly by two
Secondary wind is completely separated with tertiary air.By the technological design and adjustment to kiln hood Secondary Air and tertiary air shunting, improve into kiln two
Secondary air temperature improves coal powder in kiln head burning, under conditions of significantly improving calcined by rotary kiln ability, reduces kiln hood and feeds coal amount, subtract
Few interior air quantity of kiln, realizes and reduces thermal NO in kiln from sourceXAnd fuel type NOXYield.
As shown in figure 3, the integrated device 12 that sprays is the coal pipe 16 for including spreading case 15 with spraying coal dust, the spreading case
Inside be cavity, coal pipe be set to spreading box cavity center at, coal pipe outlet end be equipped with deflector.The spreading case 3 passes through solid
Reservation is connect with dore furnace flue shell 1, after the preheated device preheating of cold conditions raw material by material distributing valve through feeder pipe and spreading case into
Enter in dore furnace, while coal pipe sprays coal dust and carries out decomposition combustion.
As shown in Fig. 2, the denitrator 11 that sprays includes spreading case 15, the coal pipe 16 for spraying coal dust and sprinkling vapor
Vapor pipe 17, the coal pipe are set to spreading box cavity center, and coal pipe outlet end is equipped with deflector, and coal pipe corresponds to two sides and sets respectively
There is vapor pipe.
The lower part of the denitration chamber 8 is equipped with necking, and the top of kiln tail smoke-box is connect with the necking of denitration chamber bottom, described de-
Temperature measuring equipment is equipped in nitre room.The temperature measuring equipment is detected using existing thermocouple or infrared radiation thermometer, as long as can reach thermometric
Testing goal technical solution is the deformation of the temperature measuring equipment.Denitration room temperature is monitored in real time by temperature measuring equipment, passes through four
Flexibly and effectively control the indoor temperature of denitration in grade cyclone cylinder feeder pipe sub-material to denitration chamber, control herein temperature in 900-
It 1100 DEG C, to keep stable denitration reaction, and avoids generating the technological problems such as skinning because of high temperature.
It needs a large amount of decomposition heat according to dore furnace decomposing carbonate but does not need the process characteristic of high-temp combustion, decomposing
Ad hoc denitration chamber between furnace and necking, and tertiary air is arranged on denitration chamber according to the time requirement that denitration needs, it controls
Fuel substep combustion heat release realizes the perfect combination of denitration and exothermic decomposition.
A method of system that realizing green denitration using dry technology for production includes the following steps:
(1), the preheated device level-one of cold conditions raw material enters dore furnace 9 to after preheating between Category Four cyclone cylinder 14, revolves in level Four
Material runs out of steam downwards after fertilizer separation in air duct 14, and by material distributing valve 10, to be divided to be two strands, above one by feeder pipe through spraying
Enter in dore furnace 9 after spreading the spreading case dispersion of integrated device 12, below another stock being spread by feeder pipe through spraying denitrator 11
Enter denitration chamber 8 after hopper dispersion.It sprays denitrator 11 and not only plays the effect for keeping material fully dispersed, there are one critically important
Effect, be exactly coal dust and water-vapour spray device, coal dust and vapor are sent by coal pipe and vapor pipe sprays denitrator 11
Afterwards, entered in denitration chamber 8 by reasonable wind speed, coal dust, vapor and a small amount of O to come out of rotary kiln 4 in denitration chamber 82
Series of chemical occurs, to eliminate a large amount of NO generated in kilnXAnd the fuel type NO that coal dust generatesX。
The decomposition coal dust for spraying into eighty per cant or more by spraying denitrator 11 in denitration chamber 8, with the vapor sprayed into simultaneously
Efficiently mixing nonflame hydrogen group low oxygen combustion is carried out in high temperature kiln exit gas, forms CO, H of high concentration2And CH4, HCN and
The reducing agents such as fixed carbon.Water vapour promotes the efficient burning of CO as the addition of hydric group, it is ensured that coal calorific value it is effective
It utilizes.The chemical reaction occurred herein is
A large amount of reducing gas CO disposably effectively eliminates generated all types of NO in kilnX, by NOXIt is reduced into N2Etc. nothings
The inert gas of pollution.Principle is
In addition, coal dust burns under anoxic conditions inhibits itself fuel type NOXIt generates.It is sprayed simultaneously in denitration chamber with coal dust
Enter there are also it is suitable enter furnace raw material, adjusting control denitration room temperature by the decomposition of this part raw material heat absorption, to be in denitration best
Temperature not only can guarantee denitration efficiency, but also may insure no localized hyperthermia and generate thermal NOX, and cause the knot of dore furnace
Skin problem.
(2), due to the reasonable design wind speed herein of kiln tail smoke-box 7, material enters after dore furnace 9 and denitration chamber 8 all can be by
Wind is with being upwardly into dore furnace, while coal dust enters in dore furnace also by integrated device 12 is sprayed, and the burning of coal dust is to object
The decomposition of material brings heat.Simultaneously because coal dust and material and the pure O of a large amount of high temperature to come through tertiary-air pipe 52Mixing combustion
It burns, detonation and localized hyperthermia is avoided to damage refractory material.Material after the decomposition gas material after dore furnace enters five-stage whirlwind cylinder 13
Separation, material, which runs out of steam, enters rotary kiln 4 via kiln tail smoke-box 7 downwards.
Uncombusted coal dust and reducibility gas leaves denitration chamber and enters tertiary air oxygen-rich area, by without steam jet
It sprays integrated device to ignite, further combustion heat release and abundant after-flame.Integrated device is sprayed uniformly to spread the furnace raw material that enter of the overwhelming majority
Enter into furnace tertiary air, at the same also according to come out of the stove CO concentration the case where spray into a small amount of coal dust, this part coal dust mainly strengthen enter
The after-flame of the reducing gas of main burning resolver reacts, to ensure making full use of for fuel heat.It is closed if CO concentration of coming out of the stove is in
Range is managed, which can add or be not added less.Raw material, coal dust and reducibility gas have uniformly been brought into due to spraying integrated device
The heat of burning is rapidly absorbed, and be ensure that the uniform of in-furnace temperature, is avoided thermal NOXGeneration.
It is touched in dore furnace by the superfluous reducing gas that denitration chamber enters dore furnace and dore furnace is entered by tertiary-air pipe
Oxygen-enriched air after burn away heat release, to realize that substep burns.And due to being entered simultaneously in dore furnace by spraying integrated device
The raw meal powder and 20% dore furnace coal below for coming from the feeder pipe sub-material of C4 cyclone cylinder 70% or more, in dore furnace
Guarantee to burn in dore furnace without inflammation after being sufficiently mixed, temperature is maintained at 850-1000 DEG C, therefore will not generate heat in dore furnace
Power type NOX, only minimal amount of fuel type NOX。
(3), entering in kiln by the material of decomposition becomes clinker by high-temperature calcination, into grate-cooler system 1, grate-cooler
System has a large amount of cold wind to enter, to be quickly cooled down clinker, cold wind also largely absorbs the heat of clinker while cooling down clinker,
High temperature wind after the heating of grate-cooler system front end takes fan housing 3 to enter in rotary kiln 4 by Secondary Air, to coal dust combustion in rotary kiln 4
It burns and O is provided2And heat, behind a large amount of medium temperature wind take fan housing 2 to enter in dore furnace 9 through tertiary-air pipe 5 by tertiary air, to dividing
The coal dust firing solved in furnace 9 provides O2And heat.Tertiary-air pipe 5, which is equipped with tertiary air valve 6, can flexibly adjust rotary kiln 4
It is balanced with the air feed of dore furnace 9.
Due to needing to complete the firing link of clinker in rotary kiln, sinter leaching link is mainly that clinker mineral was formed
Journey.Contain more C in good clinker3S, C3S is by C2What S and CaO was formed after high-temperature fusion, reaction rate is with temperature
Exponentially change, temperature is higher for C3S formation is more advantageous, and sinter leaching does not need too many heat, as long as guaranteeing enough fire
Flame temperature, clinkering zone flame temperature generally cannot be below 1600 DEG C in rotary kiln, substantially at 1700 DEG C~1900 DEG C or so.And it is fiery
When flame temperature is more than 1600 DEG C, thermal NOXAs temperature raising is doubled and redoubled.According to the theoretical temperatures meter of coal dust firing temperature
Calculate formula, tth=(Qnet+cftf+Vacata)/(Vc)
Wherein: tthFor unit quality coal dust theoretical temperature combustion；
QnetFor coal dust calorific value；
cfFor coal dust specific heat capacity；
tfFor the temperature of coal dust；
VaFor air air quantity needed for combusting coal fines；
caFor air specific heat capacity；
taFor the temperature of air；
V is the amount of flue gas emission that burning is formed；
C is flue gas specific heat capacity.
It follows that improve flame temperature should control lower coefficient of excess air, i.e. reduction amount of flue gas emission V.So
Under the premise of guaranteeing coal dust full combustion, reduce into the available higher flame temperature of kiln air capacity.It is taken by Secondary Air
Fan housing and tertiary air take technique adjustment and the scrap build of fan housing, are improved as far as possible into kiln secondary air temperature, and secondary air temperature is higher, kiln
Head need to be fewer with coal, is reduced with coal, and the amount of oxygen that fuel combustion needs is just few, just reduces into kiln air capacity, to reach
Reduce thermal NO in rotary kilnXAnd fuel type NOXThe purpose of production quantity.
It, can be in the case where any chemical denitrfying agent be not added, by decomposition furnace outlet NO using green denitrating technique methodX
Concentration of emission is controlled in 300mg/Nm3Within, and realize high-quality and efficient production.It is original that green denitrating technique technology is aided with system
SNCR denitration system can control system NO using a small amount of ammonium hydroxide (being less than 1.8kg/t clinker)XConcentration of emission is lower than 100mg/
Nm3, can be by NO using 2.5kg/t clinker or so ammonium hydroxideXConcentration of emission is controlled in 50mg/Nm3Hereinafter, reaching national requirements
Minimum discharge requirement.
The above, only explain through diagrams some principles of the invention, and this specification is not intended to limit to the present invention
In the shown specific structure and the scope of application, therefore all corresponding modifications that may be utilized and equivalent,
Belong to the applied the scope of the patents of the present invention.
In addition to the technical characteristic described in the specification, remaining technical characteristic is technology known to those skilled in the art.
Claims (9)
1. a kind of system for realizing green denitration using dry technology for production, including multistage cyclone cylinder, dore furnace, kiln tail smoke-box,
Rotary kiln and grate-cooler, characterized in that the dore furnace lower part is equipped with denitration chamber, is equipped with the spray for spraying coal dust in the dore furnace
Integrated device is spread, is equipped with while spraying the spraying denitrator of steam and coal dust in the denitration chamber, the denitration chamber lower part is equipped with kiln
Tail smoke-box, the kiln tail smoke-box are connected with rotary kiln, and the grate-cooler of rotary kiln end is equipped with Secondary Air and takes fan housing and tertiary air
Take fan housing, the Secondary Air takes fan housing connection grate-cooler and rotary kiln, and the tertiary air takes fan housing to be set to after Secondary Air takes fan housing
Side, tertiary air take fan housing connection grate-cooler and tertiary air air hose, the air outlet of the tertiary-air pipe to be connected with dore furnace.
2. a kind of system for realizing green denitration using dry technology for production according to claim 1, characterized in that described
Multistage cyclone cylinder includes one cyclonic cylinder, second level cyclone cylinder, three-level cyclone cylinder, Category Four cyclone cylinder and five-stage whirlwind cylinder, and described four
The discharge port of grade cyclone cylinder is divided into two-way by material distributing valve, wherein discharge port through feeder pipe and sprays integrated device and dore furnace all the way
It is connected, another way discharge port is connected through feeder pipe and spraying denitrator with denitration chamber.
3. a kind of system for realizing green denitration using dry technology for production according to claim 1, characterized in that described
Secondary Air takes fan housing and tertiary air that fan housing is taken to be independent cover respectively, and the Secondary Air takes fan housing close to rotary kiln discharging point,
The tertiary air takes fan housing far from rotary kiln discharging point, extracting high-temperature wind it is secondary take fan housing be set to kiln hood and with rotary kiln and
Grate-cooler is connected, and the tertiary air for extracting medium temperature wind takes fan housing to be set to the rear side that Secondary Air takes fan housing, and tertiary air takes fan housing and three
Secondary air hose is connected to grate-cooler.
4. a kind of system for realizing green denitration using dry technology for production according to claim 1, characterized in that described
Spraying integrated device includes spreading case and the coal pipe for spraying coal dust, and the inside of the spreading case is cavity, and coal pipe is set in spreading case
At chamber center, coal pipe outlet end is equipped with deflector.
5. a kind of system for realizing green denitration using dry technology for production according to claim 1, characterized in that described
It sprays denitrator to include spreading case, spray the coal pipe of coal dust and spray the vapor pipe of vapor, the coal pipe is set to spreading case
Lumen centers, coal pipe outlet end are equipped with deflector, and coal pipe corresponds to two sides and is respectively equipped with vapor pipe.
6. a kind of system for realizing green denitration using dry technology for production according to claim 1, characterized in that described
Tertiary-air pipe is equipped with tertiary air valve.
7. a kind of system for realizing green denitration using dry technology for production according to claim 1, characterized in that described
The lower part of denitration chamber is equipped with necking, and the top of kiln tail smoke-box is connect with the necking of denitration chamber bottom, is equipped with and surveys in the denitration chamber
Warm device.
8. according to claim 1 to a kind of side for realizing green denitrating system using dry technology for production described in 7 any one
Method, characterized in that include the following steps:
(1), the preheated device level-one of cold conditions raw material enters dore furnace, the wind in Category Four cyclone cylinder to after preheating between Category Four cyclone cylinder
Material, which runs out of steam, after material separation is divided into two strands by material distributing valve downwards, above one enter in dore furnace, below another stock into
After entering denitration chamber, coal dust and vapor by pipeline feeding spraying denitrator, entered in denitration chamber by the pressure of wind, out of stock
Indoor coal dust, vapor and a small amount of O to come out of rotary kiln2It chemically reacts, to eliminate a large amount of NO generated in kilnX
And the fuel type NO that coal dust generatesX；
(2), enter after dore furnace and denitration chamber all can be by wind with being upwardly into dore furnace for material, while coal dust is also by spray
It spreads integrated device to enter in dore furnace, the burning of coal dust brings heat to the decomposition of material, simultaneously because coal dust and material and warp
A large amount of high temperature pure airs that tertiary-air pipe comes are mixed and burned, the gas after dore furnace enters five-stage whirlwind cylinder of the material after decomposition
Material separation, material, which runs out of steam, enters rotary kiln via kiln tail smoke-box downwards；
(3), entering in kiln by the material of decomposition becomes clinker by high-temperature calcination, and into grate-cooler, grate-cooler has a large amount of cold
Wind enters, to be quickly cooled down clinker, cold wind also largely absorbs the heat of clinker while cooling clinker, before grate-cooler system
High temperature wind after the heating of end takes fan housing to enter in rotary kiln by Secondary Air, provides O to coal dust firing in rotary kiln2And heat,
A large amount of medium temperature wind takes fan housing to enter in dore furnace through tertiary-air pipe by tertiary air below, mentions to the coal dust firing in dore furnace
For O2And heat.
9. a kind of method for realizing green denitrating system using dry technology for production according to claim 8, characterized in that
Tertiary-air pipe is equipped with tertiary air valve, is balanced by the air feed that valve can flexibly adjust rotary kiln and dore furnace.
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| CN112058064A (en) * | 2020-09-23 | 2020-12-11 | 南京凯盛国际工程有限公司 | Circulating spouting NOx emission reduction system and working method thereof |
| CN112844003A (en) * | 2019-11-28 | 2021-05-28 | 中国科学院工程热物理研究所 | Multistage suspension preheater, control method and control method of cement clinker generation equipment |
| CN114199024A (en) * | 2021-11-23 | 2022-03-18 | 天瑞集团禹州水泥有限公司 | Denitration system for cement kiln decomposing furnace with large reduction area |
| CN114788988A (en) * | 2022-05-16 | 2022-07-26 | 山东棱角建材科技有限公司 | SNCR (selective non-catalytic reduction) accurate denitration process for clinker production line |
| CN114797432A (en) * | 2022-03-29 | 2022-07-29 | 中国中材国际工程股份有限公司 | Device and method for adjusting temperature and spraying ammonia for denitration by using flue gas of cement plant |
| CN115218649A (en) * | 2022-07-15 | 2022-10-21 | 浙江中锦材水泥技术有限公司 | Cement kiln coal material co-firing structure and process |
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