CN110118488A - Cement decomposing furnace and using its promote inner flue gas of the stove mixed method - Google Patents
Cement decomposing furnace and using its promote inner flue gas of the stove mixed method Download PDFInfo
- Publication number
- CN110118488A CN110118488A CN201910324953.6A CN201910324953A CN110118488A CN 110118488 A CN110118488 A CN 110118488A CN 201910324953 A CN201910324953 A CN 201910324953A CN 110118488 A CN110118488 A CN 110118488A
- Authority
- CN
- China
- Prior art keywords
- tertiary air
- injector
- furnace
- pipe
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases, or liquids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases, or liquids
- F27D2007/023—Conduits
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a kind of cement decomposing furnaces comprising furnace body and tertiary air pipeline, the tertiary air pipeline are connected to and the furnace body, further includes: injector is connected to the furnace body, for providing mixed gas into the furnace body；The injector is mainly made of nozzle, bleed room, mixing tube and diffuser；First pipe is connected to the injector and the tertiary air pipeline；Second pipe is connected to the nozzle, for providing gas to the injector；The injector is used to be delivered to after gas mixing in the furnace body；In the vertical direction, the link position of the injector and the furnace body is higher than the link position of the tertiary air pipeline and the furnace body.The present invention also provides a kind of methods for promoting inner flue gas of the stove mixing using the cement decomposing furnace.The mixed effect of dore furnace and method of the invention significantly lifting factorization inner flue gas of the stove promotes mass transfer, heat transfer and the chemical reaction of flue gas each component.
Description
Technical field
The present invention relates to a kind of cement industry kiln devices, promote furnace more particularly to a kind of cement decomposing furnace and using it
Interior flue gas mixed method.
Background technique
In cement industry production, what is be commonly used is online dore furnace, and the flue gas from kiln tail is by dore furnace
Bottom sprays into dore furnace, and the tertiary air introduced from kiln hood enters furnace by dore furnace lower part cone segments, after the raw material dispersion by preheating
Enter decomposition lower portion of furnace body by one-point or multi-point, fuel then enters furnace body by way of pneumatic conveying.By in dore furnace
After a series of effects such as material, the dispersion of fuel, mixing, burning, decomposition, conveying, the raw material of decomposition with hot fume together by
Decomposition furnace outlet discharge.
Due to the positional relationships such as smoke-box air inlet in dore furnace feeding point, hello coal point, tertiary air, kiln, stream in dore furnace is caused
Field distribution is uneven, and the mixed effect of the mixing of each component, flue gas and particulate matter is poor in flue gas, this is to influence carbonic acid salinity
An important factor for processes such as solution, fuel combustion, fractional combustion, SNCR denitration, Disposal of Domestic.If dore furnace can be promoted
The mixing of interior flue gas, it will be greatly facilitated above process chemical reaction rate, improve the decomposition furnace outlet extent of reaction, lifting factorization
Coal dust burn-off rate, denitrification rate, Disposal of Domestic amount etc. in furnace.
In the prior art, the main method of lifting factorization inner flue gas of the stove mixed effect has following two: a kind of method is to change
Kind dore furnace self structure, such as change the relative position of wind, material, coal in dore furnace, cigarette is improved using itself flow-disturbing in furnace
Gas mixed effect, but there is certain difficulty in the specific implementation process, promote to decompose the cost of kiln gas mixing to be to significantly increase
Resistance in dore furnace, while according to the raw material for returning to dore furnace after Cyclonic reactor generating in feeder pipe skinning, blocking
Phenomena such as, it is additionally present of the defect that space is big, improvement expenses are high etc. needed for transformation.Another method is then to force to blast external gas
Stream promotes flow of flue gas in dore furnace, increases turbulence effects, promotes flue gas mixing.A large amount of cold wind are passed through to the shape of high pressure air blast
Formula sprays into dore furnace, although not will increase its drag losses, calciner temperature will necessarily be reduced by blasting excessive cold wind, influences
The processes such as fuel combustion, raw material decomposition.
Summary of the invention
It is a primary object of the present invention to, a kind of cement decomposing furnace is provided and promotes inner flue gas of the stove mixed method using its,
Defect of the existing technology is overcome, significantly the mixed effect of lifting factorization inner flue gas of the stove, promotes the biography of flue gas each component
Matter, heat transfer and chemical reaction, while having little influence on calciner temperature, coal dust burn-off rate, raw material point in lifting factorization furnace
Solution rate, CO burn-off rate, SNCR denitration efficiency, Disposal of Domestic amount etc..
The object of the invention to solve the technical problems adopts the following technical solutions to realize.It proposes according to the present invention
A kind of cement decomposing furnace comprising: furnace body and tertiary air pipeline, the tertiary air pipeline be connected to the furnace body, it is described
Dore furnace further include:
Injector is connected to the furnace body, for providing mixed gas into the furnace body；The injector is mainly by spraying
Mouth, bleed room, mixing tube and diffuser composition；
First pipe is connected to the injector and the tertiary air pipeline；
Second pipe is connected to the nozzle, for providing gas to the injector；
The injector from the gas of the gas of the first pipe and the second pipe described for will draw
It is mixed in the mixing tube of emitter, and mixed gas is delivered in the furnace body；
In the vertical direction, the link position of the injector and the furnace body is higher than the tertiary air pipeline and the furnace
The link position of body.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
Preferably, cement decomposing furnace above-mentioned, wherein the air inlet of the tertiary air pipeline is arranged in the first pipe
Between valve, and the axis of the first pipe is perpendicular to the axis of the tertiary air pipeline.
Preferably, cement decomposing furnace above-mentioned, wherein the axis of the injector is parallel to the axis of the tertiary air pipeline
Line.
Preferably, cement decomposing furnace above-mentioned, wherein the injector is connected to the middle part of the furnace body.
Preferably, cement decomposing furnace above-mentioned, wherein the dore furnace further include: blower or compressor, with described second
Pipeline connection, for improving the pressure into the gas of the second pipe.
Preferably, cement decomposing furnace above-mentioned, wherein thermocouple is equipped in the mixing tube, for measuring the mixing tube
The temperature of interior mixed gas.
Also the following technical solution is employed for the object of the invention to solve the technical problems to realize.It proposes according to the present invention
It is a kind of using cement decomposing furnace above-mentioned promote inner flue gas of the stove mixing method comprising: by the three of the tertiary air pipeline
Secondary wind is divided into two-way and enters in the furnace body, wherein
The tertiary air of the tertiary air pipeline is divided into two-way to enter in the furnace body, wherein
First via tertiary air is directly entered in the furnace body by the tertiary air pipeline, guarantees most of fuel in furnace body
Burning；
Second road tertiary air enters in the injector by the first pipe, with the gas from the second pipe
After mixing, enter back into the furnace body；
The air quantity of the first via tertiary air is greater than the 95% of tertiary air total blast volume.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
Preferably, the method above-mentioned for promoting inner flue gas of the stove mixing, wherein the gas from the second pipe is compression
Air, air quantity account for the 1%-2% of the tertiary air total blast volume.
Preferably, the method above-mentioned for promoting inner flue gas of the stove mixing, wherein the pressure of the gas from the second pipe
For 28kPa-60kPa.
Preferably, the method above-mentioned for promoting inner flue gas of the stove mixing, wherein the flowing of the gas from the second pipe
Speed is 50-300m/s.
By above-mentioned technical proposal, cement decomposing furnace of the present invention and using its promote inner flue gas of the stove mixed method at least have
Following advantages:
1, injector is arranged in the present invention on the basis of existing cement decomposing furnace, and the injector is used for will be from described
The gas of the gas of first pipe and the second pipe is mixed in the mixing tube of the injector, and will be mixed
Gas is delivered in the furnace body；In the vertical direction, the link position of the injector and the furnace body be higher than it is described three times
The link position of air piping and the furnace body.The present invention can be promoted significantly point by carrying out simple transformation to original dore furnace
The mixed effect of inner flue gas of the stove is solved, mass transfer, heat transfer and the chemical reaction of flue gas each component are promoted.
2, the tertiary air of tertiary air pipeline is divided into two-way and entered in the furnace body by the present invention, wherein first via tertiary air
It is directly entered in the furnace body by the tertiary air pipeline, guarantees the burning of most of fuel in furnace body；Second road tertiary air
Enter in the injector by the first pipe, after the gas mixing from the second pipe, enters back into the furnace
In vivo；The air quantity of the first via tertiary air is greater than the 95% of tertiary air total blast volume.The method of the present invention is inhaled by high pressure cold wind volume
The high temperature tertiary air of low pressure sprays into dore furnace together after mixing, promotes the mixing of high-temperature flue gas, and accelerates raw in flue gas
The dispersion and heat transfer of feed powder and coal dust.
3, compared with the method for only spraying into high pressure cold wind, dore furnace of the invention and method will be cold by external injector
Mixing portion tertiary air while wind sprays into dore furnace is significantly reducing cold wind straying quatity, is reducing to dore furnace flue-gas temperature shadow
While sound, hence it is evident that enhance the agitaion to high-temperature flue gas in dore furnace, improve the mixed effect of flue gas, to help
In improving coal dust burn-off rate in dore furnace, improves and decompose furnace output；Promote CO and O2Mixed effect, improve CO burn-off rate；Promote
Into being uniformly distributed for NO, SNCR denitration efficiency is improved；Promote the uncombusted particle of house refuse to mix with flue gas, improves life rubbish
Rubbish disposition amount etc..
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the cement decomposing furnace of one embodiment of the invention；
Fig. 2 is the structural schematic diagram of the cement decomposing furnace of another embodiment of the present invention；
Fig. 3 is the portion the A enlarged drawing of the cement decomposing furnace of the embodiment of the present invention；
Fig. 4 a, Fig. 4 b, Fig. 4 c, Fig. 4 d and Fig. 4 e are dore furnaces under different the amount of injection and jet velocity in the embodiment of the present invention
The schematic diagram of NO concentration at the outlet distribution.
Specific embodiment
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Attached drawing and preferred embodiment promote its tool of inner flue gas of the stove mixed method to cement decomposing furnace proposed according to the present invention and using it
Body embodiment, structure, feature and its effect, detailed description is as follows.In the following description, different " embodiment " or " real
Apply example " refer to be not necessarily the same embodiment.In addition, the special characteristic, structure or feature in one or more embodiments can be by appointing
What suitable form combination.
As shown in Figure 1-3, the invention proposes a kind of cement decomposing furnaces comprising furnace body 11 and tertiary air pipeline 12, institute
It states tertiary air pipeline 21 and is connected to the furnace body 11,
Injector 3 is connected to the furnace body 11, for providing mixed gas into the furnace body；The injector 3 is main
It is made of bleed room 31, nozzle 32, mixing tube 33 and diffuser 34；
First pipe 21 is connected to the injector 3 and the tertiary air pipeline 12；
Second pipe 41 is connected to the nozzle 32, for providing gas to the injector 3；
The injector 3 be used for by from the gas of the first pipe 21 and the gas of the second pipe 41 in institute
It states and is mixed in the mixing tube 33 of injector 3, and mixed gas is delivered in the furnace body 11；
In the vertical direction, the link position of the injector 3 and the furnace body 11 be higher than the tertiary air pipeline 12 with
The link position of the furnace body 11.
What needs to be explained here is that the present invention is the transformation carried out on the basis of existing cement manufacture plant, in order to save
Cost-saving, the best way are to obtain preferable effect on the basis of change original equipment as few as possible, and existing dore furnace is set
Several tertiary air pipelines are equipped with, just carry out design improvement according to several tertiary air pipelines, tertiary air pipeline does not make any change.
Tertiary air is divided two-way to enter in furnace body by the present invention by the way that injector is arranged on tertiary air pipeline, to promote inner flue gas of the stove mixed
It closes, guarantees that injector of the invention is arranged at least one tertiary air pipeline.Specifically it is exactly, if set in existing equipment
As soon as a tertiary air pipeline is equipped with, then injector is arranged on the tertiary air pipeline；If, can be with there are two tertiary air pipeline
Injector is set on a tertiary air pipeline wherein, injector can also be all set on two tertiary air pipelines.Likewise,
If there is more than two tertiary air pipelines, injector can be set on one or more tertiary air pipelines wherein, it can also be
Injector is all set on all tertiary air pipelines, the number of injector can be set according to the actual needs, in principle injection
The number of device setting is more, and mixed effect is better, but cost also accordingly increases, therefore, on the basis of considering cost performance
To reasonably select the number of injector.
The embodiment of the present invention does not limit injector specifically, if meet the present invention claims injector can make
With.
As shown in figure 3, being the portion the A enlarged drawing of the cement decomposing furnace of the embodiment of the present invention, one embodiment of the present of invention is mentioned
Injector 3 out is mainly made of bleed room 31, nozzle 32, mixing tube 33 and diffuser 34；Bleed room 31 has one to be drawn
Tertiary air entrance is penetrated, nozzle 32 is located in bleed room 31, and for mixing tube between mixing tube 33 and diffuser 34, injector can
Guarantee the gas of compression under the premise of certain pressure and flow velocity, inhales the part tertiary air in the tertiary air pipeline by volume
Into the inner space of the injector.
The working principle of injector of the present invention: injector utilizes another strand of low speed low energy gas of one high speed high energy airflow injection
Stream, injection air-flow through shrink shape nozzle spout into mixing tube, around be by injection air-flow.It is acted on by the blending on boundary, injection
Air-flow is transferred energy to by flow type pump with injection.The mixed zone that blending is formed is gradually expanded and is full of entire mixing tube, using one section
Mixed process, until mixing chamber outlet, flowing almost becomes uniform flow.It is additionally provided with a diffuser, behind mixing tube to drop
Low flow velocity improves static pressure.Driving nozzle can the heart in the duct, can also be in pipeline surrounding.In gas flow system, injector is made
It for a power source, does work to by ejection gas, improves its energy.
In the embodiment of the present invention, the gas in first pipe is low-voltage high-temperature tertiary air, and the gas in second pipe is band
Have the gas of certain pressure, gas preferably herein is compressed air, referred to as high pressure cold wind, the high pressure cold wind in second pipe with
Certain pressure and flow velocity enters injector by nozzle, and the low-voltage high-temperature three inhaled in tertiary air pipeline is rolled up by high pressure cold wind
Secondary wind, part low-voltage high-temperature tertiary air is through in the bleed room for entering injector of first pipe, in the mixing tube of injector,
High pressure cold wind and the mixing of the high temperature tertiary air of low pressure are sprayed into dore furnace together through diffuser by mixed gas, are promoted
Into the mixing of furnace high-temperature flue gas, and accelerate the dispersion and heat transfer of raw meal powder and coal dust in flue gas.The low pressure to come from grate-cooler
High temperature tertiary air largely pass through main pipeline and enter in furnace body, provide air needed for coal dust firing, the heat for generation of burning supplies
Carbonate decomposition, small part passes through first pipe, under the Involving velocity of injector, sprays into furnace body, promotes furnace high-temperature cigarette
The mixing of gas.
The pipe diameter size of first pipe is calculated according to mass ratio of induced-to-inducing air and is obtained in the embodiment of the present invention；The mass ratio of induced-to-inducing air of injector
It is designed as 2-5, i.e. 1 part of cold wind of every penetrating, 2-5 parts of high temperature tertiary airs can be extracted and enter injector；Injector fluid outlet connects
Enter dore furnace cylinder, by exporting the flowing of high-temperature flue gas, promotes the mixing for decomposing inner flue gas of the stove.Injector of the invention can be adopted
With with the perpendicular arrangement form in flow of flue gas direction in dore furnace, or with flow of flue gas direction in dore furnace in tangential or cut to cloth
Form is set, it is in arranged tangential that preferably arrangement form, which is with dore furnace flow of flue gas direction,.
The mixed gas outlet of injector one opening from furnace body is goed deep into dore furnace, and the depth goed deep into furnace is
0.05-0.1m, it should be noted that the distance that mixed gas pipeline protrudes into the dore furnace can not be excessive, can draw if excessive
It plays mixer head to be decomposed dust serious wear in furnace, but mixed gas pipeline suitably protrudes into dore furnace, can promote
Decompose the mixed effect of inner flue gas of the stove.
What needs to be explained here is that the link position of injector and furnace body depends primarily on tertiary air entrance, coal powder entrance
Position, when tertiary air entrance of the link position apart from furnace body is excessive, on the one hand because the limited volume of furnace body to promote
Inner flue gas of the stove mixing effect can weaken, on the other hand apart from it is excessive when flue-gas temperature decrease, and mix brought by effect
Fruit can more bring into play at high temperature；Otherwise when tertiary air entrance of the link position apart from furnace body is too small, because of mixed gas
Temperature is lower than in-furnace temperature, may will affect coal dust firing, the size of tertiary air entrance of the link position apart from furnace body according to
The height decision of the dore furnace of actual use, preferred distance 5-10m.
Since the temperature of tertiary air is higher, generally at 1000 DEG C or so, because present gas compressing equipment cannot withstand
So high temperature, so tertiary air can not directly be compressed to increase the mixed effect of inner flue gas of the stove；And it is directly blasted into furnace
High pressure cold wind can reduce the temperature of inner flue gas of the stove, influence fuel combustion, the processes such as raw material decompose, therefore, the present invention is by tertiary air
Divide two-way to send to furnace body, wherein tertiary air is directly entered in furnace body all the way, guarantees the burning of most of fuel；Another way is three times
Wind enters injector through the volume inspiration of high pressure cold wind, and after mixing with high pressure cold wind, another rise is sprayed into furnace body, promotes high-temperature flue gas
Mixing, and accelerates the dispersion and heat transfer of raw meal powder and coal dust in flue gas, thus help to be promoted the burn rate of uncombusted coal dust,
The decomposition rate of raw material, and reduce CO discharge, improve SNCR denitration efficiency, improve Disposal of Domestic amount etc..
Preferably, as shown in Figure 1, one embodiment of the present of invention propose a kind of cement decomposing furnace, with above-described embodiment
It compares, dore furnace includes a tertiary air pipeline 12, and first pipe extended upwards is offered on the tertiary air pipeline 12
Road 21, and injector 3 is connected on the top of the first pipe 21.
Valve 13 is set on tertiary air pipeline 12, the air quantity of the tertiary air in tertiary air pipeline 12 is adjusted, is guaranteed
The decomposition of the conflagration of coal dust and raw material under any coal quality.
Valve 13 is set in first pipe 12, the air quantity of the tertiary air in first pipe 12 is adjusted, guarantees injection
The temperature of mixed gas in device 3.
Preferably, as shown in Fig. 2, another embodiment of the invention propose a kind of cement decomposing furnace, with above-mentioned implementation
Example is compared, dore furnace includes two tertiary air pipelines 12, and one is offered on each tertiary air pipeline 12 and is extended upwards
First pipe 21, and injector 3 is connected at the not connected end of each first pipe 21.
When being set in cement manufacture plant there are two when tertiary air pipeline, injection can be set on each tertiary air pipeline
Device, under the premise of meeting above-mentioned condition, the present invention is not intended to limit the specific location that injector is arranged on two tertiary air pipelines,
Can be identical, can part it is identical, can also be different.The type for the injector being arranged on two tertiary air pipelines can phase
Together, it can also be different.It is preferred that the type for the injector being arranged on two tertiary air pipelines is identical with position.
Preferably, the air inlet and valve 13 of the tertiary air pipeline 12 is arranged in the first pipe 21
Between, and the axis of the first pipe 21 is perpendicular to the axis of the tertiary air pipeline 12.
First pipe is arranged between the air inlet and valve of tertiary air pipeline the embodiment of the present invention, in order to prevent will be
Flue gas in furnace is drawn into first pipe.The air inlet of heretofore described tertiary air pipeline refers to that tertiary air enters tertiary air
The entrance of pipeline, and the mouth that tertiary air pipeline is connected with furnace body is the gas outlet of tertiary air pipeline, that is to say, that valve is setting
Between furnace body and first pipe.First pipe of the present invention and tertiary air pipeline are arranged vertically convenient for site operation, and conveniently
It is improved on existing device.
Preferably, the axis of the injector 3 is parallel to the axis of the tertiary air pipeline 12.
The injector arrangement parallel with tertiary air pipeline is more conducive to promote to decompose inner flue gas of the stove mixing, and facilitates
Site layout project.
When the axis of tertiary air pipeline is perpendicular to furnace body, the axis of injector is also vertical with furnace body.So mixed gas
Just enter dore furnace in vertical manner, so that hanging down after mixed gas enters dore furnace with the flow of flue gas direction in dore furnace
Directly, such arrangement form not only improves site operation transformation, and cement decomposing furnace high-temperature flue gas can preferably be promoted to mix
Mixed effect, therefore, this set are optimal set-up modes.
Preferably, the axis of the injector is parallel to the axis of tertiary air pipeline, the axis of the diffuser of the injector
Line is perpendicular to the axis of the furnace body, and the injector is arranged in above tertiary air pipeline at 5-10m.
Preferably, the injector 3 is connected to the middle part of the furnace body 11.
As aforesaid, injector is at a distance from the link position to the tertiary air entrance of furnace body of furnace body according to furnace body
Height determine, when injector is connected to the middle part of furnace body, not only can guarantee the mixed effect of flue gas in furnace body, but also can to the greatest extent may be used
Influence of the temperature of the reduction mixed gas of energy to in-furnace temperature, preferably to promote the burning of coal dust in furnace.
Preferably, as shown in figure 3, cement decomposing furnace of the invention further include: blower or compressor 5, with
The second pipe 41 connects, for improving the pressure into the gas of the second pipe 41.
It is provided with valve 42 on second pipe 41, the air quantity of the cold wind in second pipe 41 is adjusted, guarantees to draw
The pressure and flow velocity of mixed gas in emitter 3.
Blower or compressor of the invention is additionally provided with controller, for controlling the blower or compressor, to adjust into
Enter the pressure and flow velocity of the gas of second pipe.
Preferably, it is equipped with thermocouple in the mixing tube 33, is mixed for measuring in the mixing tube 33
The temperature of gas.
Thermocouple is arranged in the inner space of injector in the present invention, can measure the temperature of mixed gas in injector constantly
It spends, and adjusts the ratio of high-temperature gas and high pressure cold wind into the low pressure of injector with the size of the temperature measured, guarantee
The temperature of mixed gas cannot be too low, to prevent from influencing the ignition temperature of flue gas in furnace body.
The embodiment of the present invention also proposed a kind of method for promoting inner flue gas of the stove mixing using cement decomposing furnace above-mentioned,
Include:
The tertiary air of the tertiary air pipeline 12 is divided into two-way to enter in the furnace body 11, wherein
First via tertiary air is directly entered in the furnace body 11 by the tertiary air pipeline 12, guarantees big portion in furnace body 11
Divide the burning of fuel；
Second road tertiary air by the first pipe 21 enter the injector 3 in, with come from the second pipe 41
Gas mixing after, enter back into the furnace body 11；
The air quantity of the first via tertiary air is greater than the 95% of tertiary air total blast volume.
Tertiary air is divided into two-way by the method for the present invention, and the air quantity in tertiary air main pipeline is made to account for the 95% of tertiary air total blast volume
More than, to will not be had an impact to coal dust firing, raw material decomposition；The air quantity of tertiary air branch pipe(tube) accounts for tertiary air total blast volume
5% further rises in penetrating dore furnace after mixing with high pressure cold wind hereinafter, passing through the high temperature tertiary air that high pressure cold wind volume inhales low pressure,
Promote the mixing of high-temperature flue gas, and accelerate the dispersion and heat transfer of raw meal powder and coal dust in flue gas, to help to be promoted uncombusted
The burn rate of coal dust, the decomposition rate of raw material, and reduce CO discharge, improve SNCR denitration efficiency, improve Disposal of Domestic
Amount.
In the present invention, the mass ratio of induced-to-inducing air of injector is designed as 2-5, i.e. 1 part of cold wind of every penetrating, can extract 2-5 parts of high temperature
Tertiary air enters injector；Injector fluid outlet accesses dore furnace cylinder, by exporting the flowing of high-temperature flue gas, promotes to decompose
The mixing of inner flue gas of the stove.
In the present invention, the high temperature tertiary air to come from grate-cooler largely passes through tertiary air pipeline and enters in furnace body, provides
Air needed for coal dust firing, the heat for generation of burning is for carbonate decomposition, and small part tertiary air passes through first pipe, in injector
It under Involving velocity, sprays into furnace body, promotes the mixing of flue gas in furnace body.
Preferably, gas from the second pipe 41 is compressed air, air quantity account for it is described three times
The 1%-2% of wind total blast volume.
The flow of compression cold wind will affect the mixed effect for decomposing inner flue gas of the stove, if the flow of compression cold wind accounts for tertiary air
The ratio of total flow is too small, such as 0.1%, then the momentum for spraying into compression cold wind is too small, causes to the first pipe for entering injector
Road Extracting Ability dies down, and causes to be deteriorated to the mixed effect for decomposing inner flue gas of the stove；, whereas if the flow of compression cold wind accounts for three times
The ratio of wind total flow is too big, and such as larger than 2%, the reduction of mixed gas outlet temperature can be made, while decomposition furnace outlet temperature drops
Low, this will affect the normal operating of dore furnace.
Preferably, the pressure of the gas from the second pipe 41 is 28kPa-60kPa.
Preferably, the flowing velocity of the gas from the second pipe 41 is 50-300m/s.
The size of the pressure and flow velocity of compressing cold wind can all influence to decompose the mixed effect of inner flue gas of the stove, when compression cold wind
When flow velocity or too small pressure, the tertiary air into injector tails off, and weakens to the mixed effect for promoting solution inner flue gas of the stove；Work as compression
When the flow velocity or too big pressure of cold wind, blower, compressor power consumption increase very much, but for promoting to decompose inner flue gas of the stove mixing
The increasing degree of effect is really unobvious.Therefore, for cost performance, reasonable pressure and flowing velocity are set, is consumed in not transition
In the case where energy, it can preferably promote the mixed effect for solving inner flue gas of the stove.
Cold wind is compressed at the cold air inlet of injector with the flowing velocity of 50-300m/s, to aspirate the three of high temperature
Secondary wind；Low pressure tertiary air entrance opening is downward, and to connect first pipe, pipe diameter size is calculated according to mass ratio of induced-to-inducing air and obtained；
Injector is used for mixed high-voltage cold wind and low pressure tertiary air, and mixing temperature is obtained by being arranged in this thermocouple.
The tertiary air entered in tertiary air pipeline is divided into two-way by the embodiment of the present invention: being greater than 95% all the way three times
Wind is directly entered the dore furnace by the tertiary air pipeline, guarantees the burning of most of fuel；Another way is remaining three
Secondary wind is entered in the injector by the first pipe, is first mixed with compression cold wind, then through described in diffuser entrance
Dore furnace.The method of the present invention inhales the high temperature tertiary air of low pressure by high pressure cold wind volume, sprays into dore furnace together after mixing,
Promote the mixing of high-temperature flue gas, and accelerates the dispersion and heat transfer of raw meal powder and coal dust in flue gas.
Below in conjunction with specific embodiment, the invention will be further described, but is not to be construed as protecting model to the present invention
The limitation enclosed, some nonessential improvement that person skilled in art makes the present invention according to the content of aforementioned present invention and
Adjustment, still falls within protection scope of the present invention.
Embodiment
The present embodiment is by taking 5000t/d cement producing line as an example, and total blast volume is 120000Nm three times3/ h, three times air temperature 900
DEG C, main pipeline valve opening is 60%, and 870 DEG C of decomposition furnace outlet temperature, injector system is distributed and flow of flue gas in dore furnace
Direction is perpendicular.Implementation result of the invention is had studied by the means that computer CFD is simulated, weight analysis difference high pressure cold wind
Flow, it is different in flow rate when decomposition furnace outlet NO Component Standard deviation and evenness index variation, as shown in table 1；Difference injection
Decomposition furnace outlet NO concentration distribution schematic diagram under amount and jet velocity, as shown in Fig. 4 a, Fig. 4 b, Fig. 4 c, Fig. 4 d and Fig. 4 e.
When the amount of injection is 1%, D=0.1m, decomposition furnace outlet NO concentration distribution, as shown in fig. 4 a；
When the amount of injection is 1%, D=0.06m, decomposition furnace outlet NO concentration distribution, as shown in Figure 4 b；
When the amount of injection is 2%, D=0.1m, decomposition furnace outlet NO concentration distribution, as illustrated in fig. 4 c；
When the amount of injection is 2%, D=0.06m, decomposition furnace outlet NO concentration distribution, as shown in figure 4d.
When no injector, decomposition furnace outlet NO concentration distribution, as shown in fig 4e.
The variation of table 1 decomposition furnace outlet NO Component Standard deviation and evenness index
By table 1 and Fig. 4 it is found that compared with the dore furnace of existing no injector and method, by using of the present invention
Dore furnace and method, can be significantly reduced decomposition furnace outlet NO distribution standard deviation, improve its evenness index, show this
Dore furnace and method have been obviously promoted the mixed effect of high-temperature flue gas in dore furnace.
In the 1% of fixed high pressure cold wind air quantity accounting tertiary air total blast volume, i.e. 1200Nm3/ h, by changing injector
Gas injection speed in injector can be changed in inlet tubing diameter, while the static pressure of required blower or compressor also significantly changes
Become；With the increase of injector jet velocity, gas injection amount is significantly increased, when jet velocity is 46m/s, injection volume and spray
The amount of penetrating ratio is about 1.2；When jet velocity reaches 127m/s, which reaches about 3.4.To significantly improve mixed gas
The momentum and temperature of ejection promote the mixing of high-temperature flue gas in dore furnace, decomposition furnace outlet NO concentration distribution standard deviation drop
Low 30% or more.Simultaneously, it can be seen that due to having blasted 1% cold wind, decomposition furnace outlet temperature reduces 8 DEG C.
In fixed injection pipe diameter, jet velocity can change by changing high pressure cold wind air quantity.Such as sprayed when fixed
When pipe diameter is 0.1m, when cold wind air quantity accounts for tertiary air total blast volume and increases to 2% by 1%, jet velocity is increased to by 46m/s
91m/s, the tertiary air quantity of injection account for tertiary air total blast volume ratio and also increase to 2.4 by 1.2, and injector exports the dynamic of mixed gas
Amount significantly increases, and promotes the mixing of high-temperature flue gas in dore furnace, and decomposition furnace outlet NO concentration distribution standard deviation reduces
50% or more.
Shown by above embodiments by adjusting the valve opening on high pressure blower or compressor rotary speed, cold air duct,
Or the valve opening on tertiary air branch pipe(tube) or the valve opening on tertiary air main pipeline, can flexible modulation injection high pressure it is cold
The high temperature tertiary air air quantity of wind air quantity, injection is spraying into a small amount of high pressure cold wind simultaneously, and volume inhales a large amount of high temperature tertiary airs.
Compared with the method for only spraying into high pressure cold wind, dore furnace of the present invention and method are significantly reducing cold wind penetrating
Amount is reduced on while the influence of dore furnace flue-gas temperature, hence it is evident that enhance the agitaion to high-temperature flue gas in dore furnace, improve
The mixed effect of flue gas improves to help to improve coal dust burn-off rate in dore furnace and decomposes furnace output；Promote CO and O2's
Mixed effect improves CO burn-off rate；Promote being uniformly distributed for NO, improves SNCR denitration efficiency；Promote house refuse uncombusted
Grain mixes with flue gas, and improves Disposal of Domestic amount etc..
In the description of invention, it should be noted that the orientation of instructions such as term " on ", "lower", "horizontal", " vertical " or
Positional relationship is method based on the figure or positional relationship, is merely for convenience of description of the present invention and simplification of the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore, no
It can be interpreted as limitation of the present invention.
In addition, in the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be and be directly connected to, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, reference can be made to the related descriptions of other embodiments.
It is understood that the correlated characteristic in above-mentioned apparatus can be referred to mutually.In addition, in above-described embodiment " the
One ", " second " etc. is and not represent the superiority and inferiority of each embodiment for distinguishing each embodiment.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, according to
According to technical spirit any simple modification, equivalent change and modification to the above embodiments of the invention, this hair is still fallen within
In the range of bright technical solution.
Claims (10)
1. a kind of cement decomposing furnace, including furnace body and tertiary air pipeline, the tertiary air pipeline is connected to and the furnace body, spy
Sign is, the dore furnace further include:
Injector is connected to the furnace body, for providing mixed gas into the furnace body；The injector mainly by nozzle,
Bleed room, mixing tube and diffuser composition；
First pipe is connected to the injector and the tertiary air pipeline；
Second pipe is connected to the nozzle, for providing gas to the injector；
The injector be used for by from the gas of the gas of the first pipe and the second pipe in the injector
Mixing tube in mixed, and mixed gas is delivered in the furnace body；
In the vertical direction, the link position of the injector and the furnace body is higher than the tertiary air pipeline and the furnace body
Link position.
2. cement decomposing furnace according to claim 1, which is characterized in that
The first pipe is arranged between the air inlet and valve of the tertiary air pipeline, and the axis of the first pipe
Perpendicular to the axis of the tertiary air pipeline.
3. cement decomposing furnace according to claim 1, which is characterized in that
The axis of the injector is parallel to the axis of the tertiary air pipeline.
4. cement decomposing furnace according to claim 1, which is characterized in that
The injector is connected to the middle part of the furnace body.
5. cement decomposing furnace according to claim 1, which is characterized in that
The dore furnace further include: blower or compressor are connect with the second pipe, enter the second pipe for improving
Gas pressure.
6. cement decomposing furnace according to claim 1, which is characterized in that
Thermocouple is equipped in the mixing tube, for measuring the temperature of mixed gas in the mixing tube.
7. a kind of method for promoting inner flue gas of the stove mixing using cement decomposing furnace of any of claims 1-6, special
Sign is, comprising:
The tertiary air of the tertiary air pipeline is divided into two-way to enter in the furnace body, wherein
First via tertiary air is directly entered in the furnace body by the tertiary air pipeline, guarantees the combustion of most of fuel in furnace body
It burns；
Second road tertiary air enters in the injector by the first pipe, with the gas mixing from the second pipe
Afterwards, it enters back into the furnace body；
The air quantity of the first via tertiary air is greater than the 95% of tertiary air total blast volume.
8. the method according to claim 7 for promoting inner flue gas of the stove mixing, which is characterized in that
Gas from the second pipe is compressed air, and air quantity accounts for the 1%-2% of the tertiary air total blast volume.
9. the method according to claim 7 for promoting inner flue gas of the stove mixing, which is characterized in that
The pressure of gas from the second pipe is 28kPa-60kPa.
10. the method according to claim 7 for promoting inner flue gas of the stove mixing, which is characterized in that
The flowing velocity of gas from the second pipe is 50-300m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910324953.6A CN110118488B (en) | 2019-04-22 | 2019-04-22 | Cement decomposing furnace and method for promoting mixing of flue gas in furnace by using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910324953.6A CN110118488B (en) | 2019-04-22 | 2019-04-22 | Cement decomposing furnace and method for promoting mixing of flue gas in furnace by using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110118488A true CN110118488A (en) | 2019-08-13 |
| CN110118488B CN110118488B (en) | 2020-09-22 |
Family
ID=67521341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910324953.6A Active CN110118488B (en) | 2019-04-22 | 2019-04-22 | Cement decomposing furnace and method for promoting mixing of flue gas in furnace by using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110118488B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114673986A (en) * | 2022-03-24 | 2022-06-28 | 西安热工研究院有限公司 | System for improving powder burnout performance of tertiary air zone |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2674304Y (en) * | 2003-07-16 | 2005-01-26 | 王霁 | High-temp low-oxygen air and smoke mixer |
| CN201250186Y (en) * | 2008-08-27 | 2009-06-03 | 南京凯盛水泥技术工程有限公司 | Multi-air-intake denitrogenation-type decomposing furnace |
| CN101725994A (en) * | 2010-02-05 | 2010-06-09 | 哈尔滨工业大学 | Exhaust gas and hot-blast air dual-medium powder feeding system |
| CN105805775A (en) * | 2016-03-16 | 2016-07-27 | 天津朝阳中晟环保科技有限公司 | Method for rapidly forming reducing atmosphere for carbothermal reduction denitration of cement kiln |
| CN206858496U (en) * | 2017-04-19 | 2018-01-09 | 北京绿岩环保科技有限责任公司 | A kind of activating and reducing combustion with meagre oxygen system |
| CN108167860A (en) * | 2017-11-28 | 2018-06-15 | 天津水泥工业设计研究院有限公司 | A kind of firing system gradient is burnt from denitration process |
-
2019
- 2019-04-22 CN CN201910324953.6A patent/CN110118488B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2674304Y (en) * | 2003-07-16 | 2005-01-26 | 王霁 | High-temp low-oxygen air and smoke mixer |
| CN201250186Y (en) * | 2008-08-27 | 2009-06-03 | 南京凯盛水泥技术工程有限公司 | Multi-air-intake denitrogenation-type decomposing furnace |
| CN101725994A (en) * | 2010-02-05 | 2010-06-09 | 哈尔滨工业大学 | Exhaust gas and hot-blast air dual-medium powder feeding system |
| CN105805775A (en) * | 2016-03-16 | 2016-07-27 | 天津朝阳中晟环保科技有限公司 | Method for rapidly forming reducing atmosphere for carbothermal reduction denitration of cement kiln |
| CN206858496U (en) * | 2017-04-19 | 2018-01-09 | 北京绿岩环保科技有限责任公司 | A kind of activating and reducing combustion with meagre oxygen system |
| CN108167860A (en) * | 2017-11-28 | 2018-06-15 | 天津水泥工业设计研究院有限公司 | A kind of firing system gradient is burnt from denitration process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114673986A (en) * | 2022-03-24 | 2022-06-28 | 西安热工研究院有限公司 | System for improving powder burnout performance of tertiary air zone |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110118488B (en) | 2020-09-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106352363B (en) | A kind of Industrial Boiler low nitrogen oxide burning and environment friendly system and process | |
| CN108014667B (en) | A kind of flue gas mixing arrangement and method | |
| CN2869593Y (en) | Staged-combustion cyclone coal-powder combustor | |
| CN209445351U (en) | A kind of low nitrogen coal burner of adjustable swirl blade | |
| CN107842849A (en) | A kind of low NO of cement decomposing furnace coal dust pre-vaporizedXCombustion system and method | |
| CN107620962B (en) | A kind of biogas low NO | |
| CN206018611U (en) | Coal burner | |
| CN110118488A (en) | Cement decomposing furnace and using its promote inner flue gas of the stove mixed method | |
| CN104048502B (en) | A kind of burning-aid method of cement rotary kiln burner oxygen-enriching device | |
| CN109099417A (en) | A kind of flue gas forces the low NOx combustion method and device of interior circulation | |
| CN102588996B (en) | Oxygen-enriched combustion system | |
| CN206391868U (en) | A kind of SCR flue gas denitrification systems mixing ammonia-gas spraying device | |
| CN109827168A (en) | A kind of coal dust manifold type burner and combustion method | |
| CN208952072U (en) | A kind of flue gas recirculation device suitable for W flame boiler | |
| CN209622762U (en) | A kind of flue gas forces the low NOx combustion apparatus of interior circulation | |
| CN208688275U (en) | A kind of device reducing cement clinker burning system NOx | |
| CN107255274A (en) | A kind of low nitrogen burner for gas boiler | |
| CN206176353U (en) | Low -nitrogen combustion device | |
| CN113019095A (en) | Heating furnace tail gas comprehensive treatment device | |
| CN101280917B (en) | Coal gas, coal fines and oxygen-enriched mixed combustion device | |
| CN207951084U (en) | Pelletizing denitrating flue gas processing system | |
| CN207137683U (en) | A kind of combustion gas furnace desulphurization system | |
| CN206398720U (en) | Cross-mixing formula eddy flow air register | |
| CN206739285U (en) | A kind of swirling pulverized coal combustion device using full burner hearth multistage combustion | |
| CN206094038U (en) | Biomass boiler system with three keep off mixed wind spout |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |