CN106731561A - Rotary hearth furnace flue gas denitrification system and method - Google Patents
Rotary hearth furnace flue gas denitrification system and method Download PDFInfo
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Abstract
The present invention proposes a kind of rotary hearth furnace flue gas denitrification system and method.The system includes：Heat storage, the heat storage includes：Smoke inlet, the smoke inlet is connected with the rotary hearth furnace nozzle, and the flue gas for being suitable to produce rotary hearth furnace is sent into inside the heat storage, to make the flue gas cool-down and recovery waste heat；Exhanst gas outlet；And reducing agent precursor layer, the reducing agent precursor layer is overlying on the heat storage inner surface, the reducing agent precursor layer is made up of reducing agent presoma, it is suitable to using the fume afterheat so that the reducing agent presoma reacts, reducing agent is obtained, denitration pipeline, the denitration pipeline is connected with the exhanst gas outlet, the mixed flue gas for being suitable to make the flue gas and reducing agent discharged by the exhanst gas outlet to constitute carry out denitration reaction, so as to the flue gas after being purified.System of the invention eliminates ammonia-gas spraying device, and reducing agent mixes evenly with flue gas, and denitration reaction is more thorough, and removal efficiency is up to more than 98%, and energy-conserving and environment-protective.
Description
Technical field
The present invention relates to derived energy chemical field.In particular it relates to rotary hearth furnace flue gas denitrification system and method.
Background technology
With developing rapidly for China's economy, the fossil fuel equal energy source such as natural gas, oil and coal obtains more extensive
Using so that environmental problem is increasingly serious, therefore causes a series of environmental problems, such as acid rain, depletion of the ozone layer, greenhouse effects
Deng so that our living environment is further severe.Energy resource structure of the China based on coal determine China nitrogen oxides and
Sulfur oxide emission is constantly in high situation, the discharge of a large amount of pollution gas so that environmental problem is increasingly tight
It is high, the production and living of our people are not only had a strong impact on, and be unfavorable for the sustainable development of China's economy.Therefore, environment is asked
Topic has obtained national increasing concern.
The NO of mankind's activity dischargeXMore than 90% comes from fuel combustion process.It is various industrial furnaces, Civil energy-saving cooking stove, motor-driven
During high temperature combustion of fuel in car and other internal combustion engines, the nitrogen substance oxidation generation NO in fuelX, in the air of participation burning
N2And O2Also NO can be generatedX.From the point of view of energy resource structure, during the primary energy and power generation energy resource of China are constituted, coal is occupied definitely
Leading position.The coal of China more than 80% is directly burning, particularly in power station, Industrial Boiler and civil boiler.
Therefore, in considerably long period, the NO in flue gasXDischarge is to cause China air NOXHow one principal element of pollution, subtract
The NO of source emission is fixed lessXIt is an important topic of atmospheric environment improvement.
Denitrating flue gas belong to burning post-processing technology, and the smoke evacuation system of many developed countries all needs to install denitrating flue gas dress
Put.Denitration method for flue gas is more, but obtains the only selective catalytic reduction and selectivity of a large amount of commercial Applications at present and non-urge
Change reducing process, other method is in experimental study stage or pilot scale stage at present.
However, flue gas denitrification system and method still have much room for improvement at present.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, of the invention
One purpose is to propose a kind of rotary hearth furnace flue gas denitrification system and method.
In one aspect of the invention, the present invention proposes a kind of rotary hearth furnace flue gas denitrification system.Reality of the invention
Example is applied, the system includes：Heat storage, the heat storage includes：Smoke inlet, the smoke inlet and the rotary hearth furnace nozzle
It is connected, the flue gas for being suitable to produce rotary hearth furnace is sent into inside the heat storage, to make the flue gas cool-down and recovery waste heat；Cigarette
Gas is exported；And reducing agent precursor layer, the reducing agent precursor layer is overlying on the heat storage inner surface, before the reducing agent
Drive body layer to be made up of reducing agent presoma, be suitable to using the fume afterheat so that the reducing agent presoma reacts, obtain
To reducing agent, denitration pipeline, the denitration pipeline is connected with the exhanst gas outlet, is suitable to make the cigarette discharged by the exhanst gas outlet
The mixed flue gas of gas and reducing agent composition carry out denitration reaction, so as to the flue gas after being purified.
Thus, rotary hearth furnace flue gas denitrification system according to embodiments of the present invention is passed through heat storage by by high-temperature flue gas, stores
Hot body reclaims the heat in high-temperature flue gas, and heat storage own temperature gradually rises while flue-gas temperature reduction so that be overlying on storage
The reducing agent precursor layer on hot surface in vivo is thermally decomposed to yield reducing agent.Reducing agent together enters de- with the flue gas after cooling
Nitre pipeline, carries out denitration reaction, so as to the flue gas after being purified.The system eliminates ammonia-gas spraying device, and reducing agent and flue gas
Evenly, denitration reaction is more thorough, and removal efficiency is up to more than 98%, and energy-conserving and environment-protective for mixing.
Embodiments in accordance with the present invention, above-mentioned rotary hearth furnace flue gas denitrification system can also have following additional technical feature：
Embodiments in accordance with the present invention, the denitration pipeline includes：Decanting zone, the decanting zone and the exhanst gas outlet phase
Even, it is suitable to carry out dedusting to the mixed flue gas；And denitration region, the denitration region is connected with the decanting zone, is suitable to make institute
Stating the mixed flue gas after dedusting carries out denitration reaction.Thereby, it is possible to realize denitrating flue gas and dedusting.
Embodiments in accordance with the present invention, the denitration pipeline further includes flue gas blowback device, the flue gas blowback dress
The two ends put are connected with the decanting zone and the denitration region respectively, are suitable to for flue gas blowback after the purification of part to enter described sinking
Drop area, to carry out dedusting.Returned through the partial fume after denitration process, purging ash disposal treatment is regularly carried out to decanting zone, can
The dust content of denitrating system is lowered into appropriateness, meanwhile, the CO in the flue gas is favourable to Catalytic Decomposition of Nitric Oxide reaction,
The reactivity of denitrating catalyst can well be improved.
Embodiments in accordance with the present invention, the inner-walls of duct of the decanting zone is provided with fin structure.Thus, the cigarette after cooling
Gas mixes evenly with reduction agent composition in the presence of fin, and its flow velocity slows down in this region, and the dust in flue gas will
Settle down.
Embodiments in accordance with the present invention, the heat storage is in spherical, strip or cellular, preferably cellular.Thus, it is easy to
Reclaim the waste heat of high-temperature flue gas.
Embodiments in accordance with the present invention, cellular heat storage be in positive six side cube, size be 450mm × 450mm ×
200mm, honeycomb aperture is not less than 32mm.
Embodiments in accordance with the present invention, the reducing agent precursor layer thickness is 1~5mm.Thus, reducing agent precursor is thin
Film is thermally decomposed to generate reducing agent, can substitute the ammonia-gas spraying device in traditional denitrating system.
In another aspect of this invention, the present invention proposes a kind of using rotary hearth furnace flue gas denitrification system described above
The method for processing flue gas.Embodiments in accordance with the present invention, methods described includes：The flue gas is passed through institute by the smoke inlet
State in heat storage, make the flue gas cool-down and recovery waste heat, while being overlying on the reducing agent precursor layer of the heat storage inner surface
Reducing agent is thermally decomposed to yield, the reducing agent mixes with by the flue gas of cooling, obtains mixed flue gas；And make described
Mixed flue gas are passed through in denitration pipeline by exhanst gas outlet, carry out denitration reaction, to be purified rear flue gas.
Embodiments in accordance with the present invention, methods described is further included：The mixed flue gas are made to be led to by the exhanst gas outlet
Enter the decanting zone, the dust in the mixed flue gas is settled under the fin structure effect of the decanting zone inner-walls of duct, with
Just dedusting is carried out；The mixed flue gas after the dedusting is passed through the denitration region, denitration reaction is carried out, after being purified
Flue gas.Thereby, it is possible to realize denitrating flue gas and dedusting.
Embodiments in accordance with the present invention, methods described is further included：Gaseous fuel, air and/or oxygen-enriched air are led to
The heat storage crossed after accumulation of heat is used for rotary hearth furnace after being preheated.Hereby it is achieved that the recycling of heat, reducing energy consumption, section
About cost.
Embodiments in accordance with the present invention, the fuel temperature after the preheating is 800~1100 DEG C, the operation of the rotary hearth furnace
Temperature is 1200~1400 DEG C, and the flue-gas temperature of the cooling is 200~400 DEG C.
Embodiments in accordance with the present invention, the heat storage includes：Inorganic powder, carbide slag and additive, based on the storage
The gross mass of hot body, the load capacity of the inorganic powder is 50~100 mass %, and the load capacity of the additive is 0~10 matter
Amount %, the load capacity of the carbide slag is 5~10 mass %.
Embodiments in accordance with the present invention, the inorganic powder includes：Flint clay, cordierite, kaolin and quartz, are based on
The gross mass of the inorganic powder, the load capacity of the flint clay is 20~50 mass %, and the load capacity of the cordierite is 15
~40 mass %, the kaolinic load capacity is 6~20 mass %, and the load capacity of the quartz is 15~30 mass %.
Embodiments in accordance with the present invention, the additive includes：Binding agent, lubricant and plasticising NMF, based on institute
The gross mass of heat storage is stated, the load capacity of the binding agent, lubricant and plasticising NMF is separately 1~5 mass %,
The binding agent is methylcellulose, and the lubricant and plasticising NMF are glycerine.
Embodiments in accordance with the present invention, the heat storage is obtained by following manner：By the inorganic powder, carbide slag
And additive carries out batch mixing, ball milling, and the water is added to carry out kneading refining, to obtain pug；By the pug carry out it is old,
Refine and extrude, obtain embryo material；And the embryo material is shaped, dried and is calcined, to obtain the heat storage.
The total time of embodiments in accordance with the present invention, the batch mixing and ball milling is 3~4 hours；The kneading refining time
It is 20 minutes；It is described it is old be temperature be 15~25 DEG C at carry out 24~48 hours；The drying is entered at 90~120 DEG C
Row 36 hours；The roasting is to be carried out at 1200~1400 DEG C 36~48 hours.
Embodiments in accordance with the present invention, the reducing agent presoma is by using electron-beam vapor deposition method so that reducing agent
Presoma is overlying on the heat storage inner surface and is formed.
Embodiments in accordance with the present invention, the reducing agent precursor layer is nitrogen-containing compound, and preferably ammonium salt or urea are more excellent
Selection of land, the ammonium salt is ammonium carbonate or ammonium hydrogen carbonate.
Thus, method according to embodiments of the present invention is passed through heat storage by by high-temperature flue gas, and heat storage reclaims high temperature cigarette
Heat in gas, heat storage own temperature gradually rises while flue-gas temperature reduction so that be overlying on going back for heat storage inner surface
Former agent precursor layer is thermally decomposed to yield reducing agent.Reducing agent together enters denitration pipeline with the flue gas after cooling, is taken off
Nitre reacts, so as to the flue gas after being purified.The method eliminates ammonia-gas spraying device, and reducing agent mixes evenly with flue gas, takes off
More thoroughly, removal efficiency is up to more than 98%, and energy-conserving and environment-protective for nitre reaction.
Additional aspect of the invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 shows the structural representation of rotary hearth furnace flue gas denitrification system according to an embodiment of the invention；
Fig. 2 shows gas circulation schematic diagram according to an embodiment of the invention；
Fig. 3 shows gas circulation schematic diagram in accordance with another embodiment of the present invention；
Fig. 4 shows the schematic flow sheet of rotary hearth furnace denitration method for flue gas according to an embodiment of the invention；And
Fig. 5 shows the schematic flow sheet of rotary hearth furnace denitration method for flue gas in accordance with another embodiment of the present invention.
Specific embodiment
Embodiments of the invention are described below in detail.The embodiments described below is exemplary, is only used for explaining this hair
It is bright, and be not considered as limiting the invention.
It should be noted that term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying phase
To importance or the implicit quantity for indicating indicated technical characteristic.Thus, " first " is defined, the feature of " second " can be with
Express or implicitly include one or more this feature.Further, in the description of the invention, unless otherwise saying
Bright, " multiple " is meant that two or more.
In the description of the invention, it is to be understood that unless otherwise clearly defined and limited, term " connected " should do
Broadly understood, for example, it may be fixedly connected, or be detachably connected, or integrally；Can mechanically connect, also may be used
Be electrical connection；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two connections of element internal
Or two interaction relationships of element, unless otherwise clearly restriction.For the ordinary skill in the art, can be with
Above-mentioned term concrete meaning in the present invention is understood as the case may be.
The present invention proposes a kind of rotary hearth furnace flue gas denitrification system and method, will be described in greater detail respectively below.
Rotary hearth furnace flue gas denitrification system
In one aspect of the invention, the present invention proposes a kind of rotary hearth furnace flue gas denitrification system.Reality of the invention
Example is applied, referring to Fig. 1, the system includes：Heat storage 100 and denitration pipeline 200.
Embodiments in accordance with the present invention, heat storage 100 includes：Smoke inlet 101, reducing agent precursor layer (are not shown in figure
Go out) and exhanst gas outlet 103.
According to a particular embodiment of the invention, smoke inlet 101 is connected with the nozzle 102 of rotary hearth furnace 300, is suitable to that bottom will be turned
Inside the flue gas feeding heat storage that stove is produced, to make flue gas cool-down and recovery waste heat.
According to a particular embodiment of the invention, reducing agent precursor layer is overlying on the inner surface of heat storage 100, reducing agent presoma
Layer is made up of reducing agent presoma, is suitable to using fume afterheat so that reducing agent presoma reacts, obtain reducing agent.
Specifically, the high-temperature flue gas discharged by rotary hearth furnace nozzle enter inside heat storage, through heat storage recovery waste heat, so as to
Make flue gas cool-down to 200~400 DEG C.Meanwhile, heat storage own temperature gradually rises so that be overlying on the reduction of heat storage inner surface
Agent precursor layer is thermally decomposed to yield reducing agent.Thus, eliminate and separately set ammonia-gas spraying device in denitration pipeline, while can also make
Obtain reducing agent fully to be mixed with flue gas, be easy to follow-up denitration process.
According to a particular embodiment of the invention, heat storage 100 is in spherical, strip or cellular.It is of the invention preferred
Embodiment, heat storage 100 is in cellular, and cellular heat storage is in positive six side cube, and size is 450mm × 450mm × 200mm,
Honeycomb aperture is not less than 32mm.Due to containing a large amount of dust in flue gas, preferably using the honeycomb ceramics of large aperture, prevent flue gas from blocking honeybee
Socket bore.
According to a particular embodiment of the invention, reducing agent precursor layer thickness is 1~5mm.Thus, it is easy to reducing agent forerunner
Body is thermally decomposed, and obtains reducing agent.
Embodiments in accordance with the present invention, denitration pipeline 200 is connected with exhanst gas outlet 103, is suitable to make discharged by exhanst gas outlet
Flue gas and reducing agent composition mixed flue gas carry out denitration reaction, so as to the flue gas after being purified.
According to a particular embodiment of the invention, denitration pipeline 200 includes decanting zone 201 and denitration region 202.
According to a particular embodiment of the invention, decanting zone 201 is connected with exhanst gas outlet 103, is suitable to carry out mixed flue gas
Dedusting.
According to a particular embodiment of the invention, the inner-walls of duct of decanting zone 201 is provided with fin structure 211.Thus, lower the temperature
Flue gas afterwards mixes evenly with reduction agent composition in the presence of fin, and its flow velocity slows down in this region, in flue gas
Dust settling gets off, and separately dust arrester is set so as to eliminate.
According to a particular embodiment of the invention, denitration region 202 is connected with decanting zone 201, is suitable to make the mixing cigarette after dedusting
Gas carries out denitration reaction.Flue gas after removing dust enters denitration region with the mixed gas of reducing agent in the presence of air-introduced machine,
Carry out denitration reaction in the presence of denitrating catalyst, discharged after the nitrogen oxides in removing flue gas, removal efficiency up to 98% with
On.
According to a particular embodiment of the invention, denitration pipeline 200 further includes flue gas blowback device 203, flue gas blowback
The two ends of device 203 are connected with decanting zone 201 and denitration region 202 respectively, are suitable to for Partial cleansing rear flue gas blowback to enter decanting zone,
To carry out dedusting.Returned through the partial fume after denitration process, purging ash disposal treatment is regularly carried out to decanting zone, can be appropriate
The dust content of denitrating system is lowered into, meanwhile, the CO in the flue gas is favourable to Catalytic Decomposition of Nitric Oxide reaction, can be very
The reactivity of denitrating catalyst is improved well.
According to a particular embodiment of the invention, referring to Fig. 2 and 3, heat storage absorbs the waste heat after high-temperature flue gas and gas is fired
Material and normal temperature air and/or oxygen-enriched air are preheated, and the gaseous fuel and air and/or oxygen-enriched air after preheating enter stove hair
Raw combustion reaction, the high-temperature flue gas that gaseous fuel, air and/or the oxygen-enriched air and burning for participating in burning are produced pass through four-way
Reversal valve is alternately accomplished accumulation of heat, warm.
Specifically, rotary hearth furnace flue gas denitrification system according to embodiments of the present invention is overlying on institute by by reducing agent precursor layer
Heat storage inner surface is stated, when high-temperature flue gas are passed through heat storage, heat storage reclaims the heat in high-temperature flue gas, flue-gas temperature reduction
Heat storage own temperature is gradually risen simultaneously so that reducing agent precursor layer is thermally decomposed to yield reducing agent.Reducing agent is with drop
Flue gas after temperature together enters denitration pipeline, first carries out dedusting in decanting zone, and the flue gas and reducing agent after dedusting enter in denitration region
Row denitration reaction, so as to the flue gas after being purified.The system eliminates ammonia-gas spraying device, and reducing agent mixes more equal with flue gas
Even, denitration reaction is more thorough, and removal efficiency is up to more than 98%, and energy-conserving and environment-protective.
The method that flue gas is processed using rotary hearth furnace flue gas denitrification system
In another aspect of this invention, the present invention proposes a kind of using rotary hearth furnace flue gas denitrification system described above
The method for processing flue gas.Embodiments in accordance with the present invention, referring to Fig. 4, the method includes：
S100 flue gas cool-downs, reducing agent precursor layer are thermally decomposed to yield reducing agent
In this step, flue gas is passed through in heat storage by smoke inlet, makes flue gas cool-down and recovery waste heat, while being overlying on
The reducing agent precursor layer of heat storage inner surface is thermally decomposed to yield reducing agent, and reducing agent mixes with by the flue gas of cooling, obtains
To mixed flue gas.
Specifically, the high-temperature flue gas discharged by rotary hearth furnace nozzle enter inside heat storage, through heat storage recovery waste heat, so as to
Make flue gas cool-down to 200~400 DEG C.Meanwhile, heat storage own temperature gradually rises so that be overlying on the reduction of heat storage inner surface
Agent precursor layer is thermally decomposed to yield reducing agent.Thus, eliminate and separately set ammonia-gas spraying device in denitration pipeline, while can also make
Obtain reducing agent fully to be mixed with flue gas, be easy to follow-up denitration process.
According to a particular embodiment of the invention, heat storage includes：Inorganic powder, carbide slag and additive, based on heat storage
Gross mass, the load capacity of inorganic powder is 50~100 mass %, and the load capacity of additive is 0~10 mass %, carbide slag
Load capacity is 5~10 mass %.Because carbide slag have that big particle diameter, surface texture be loose concurrently and particle between be randomly distributed many
Larger-size hole, acid corrosion-resistant characteristic, therefore, appropriate carbide slag is added in heat storage can be obviously improved heat storage
Specific surface area, accumulation of heat/exothermicity, wearability and decay resistance.
According to a particular embodiment of the invention, inorganic powder includes：Flint clay, cordierite, kaolin and quartz, are based on
The gross mass of inorganic powder, the load capacity of flint clay is 20~50 mass %, and the load capacity of cordierite is 15~40 mass %, high
The load capacity of ridge soil is 6~20 mass %, and the load capacity of quartz is 15~30 mass %.Thus, resulting heat storage accumulation of heat/
Exothermicity, wearability and decay resistance are higher.
According to a particular embodiment of the invention, additive includes：Binding agent, lubricant and plasticising NMF, based on storage
The gross mass of hot body, the load capacity of binding agent, lubricant and plasticising NMF is separately 1~5 mass %, and binding agent is
Methylcellulose, lubricant and plasticising NMF are glycerine.Thus, resulting heat storage accumulation of heat/exothermicity, wearability and
Decay resistance is higher.
According to a particular embodiment of the invention, heat storage is obtained by following manner：By inorganic powder, carbide slag and
Additive carries out batch mixing, ball milling, and adds the water to carry out kneading refining, to obtain pug；By pug carry out it is old, refining and
Extrude, obtain embryo material；And embryo material is shaped, dried and is calcined, to obtain heat storage.Thus, resulting accumulation of heat
Body accumulation of heat/exothermicity, wearability and decay resistance are higher.
According to a particular embodiment of the invention, the total time of batch mixing and ball milling is 3~4 hours；The kneading refining time is 20
Minute；Old carried out 24~48 hours in the case where temperature is for 15~25 DEG C；Drying is to be carried out at 90~120 DEG C 36 hours；Roasting
Burning is to be carried out at 1200~1400 DEG C 36~48 hours.Thus, resulting heat storage accumulation of heat/exothermicity, wearability and
Decay resistance is higher.
According to a particular embodiment of the invention, reducing agent precursor layer is by using electron-beam vapor deposition method so that reduction
Agent presoma is overlying on the heat storage inner surface and is formed.Specifically, using electron-beam vapor deposition method, utilize under vacuum
Electron beam carries out directly heating evaporation reducing agent precursor, is vaporized and is transported to honeycomb skin, in honeycomb regenerator body surface
Face condenses to form reducing agent precursor film.After the partial cell heat storage is heated, reducing agent precursor film thereon is heated
Generation reducing agent ammonia is decomposed, the ammonia-gas spraying device in traditional denitrating system can be substituted.
According to a particular embodiment of the invention, reducing agent presoma is nitrogen-containing compound, preferably ammonium salt or urea, more preferably
Ground, ammonium salt is ammonium carbonate or ammonium hydrogen carbonate.Reducing agent precursor can obtain ammoniation by thermal decomposition with this understanding, and
The compound of the element such as chloride, sulphur that denitrating catalyst can be caused to inactivate is not generated.
S200 denitration reactions
In this step, mixed flue gas is passed through in denitration pipeline by exhanst gas outlet, carry out denitration reaction, it is net to obtain
Flue gas after change.
Embodiments in accordance with the present invention, referring to Fig. 5, the method is further included：
S300 dedustings
In this step, mixed flue gas are made to be passed through decanting zone by the exhanst gas outlet, the dust in mixed flue gas is in sedimentation
The lower sedimentation of fin structure effect of area's inner-walls of duct, to carry out dedusting.Rotary hearth furnace material is iron ore powder and carbon, binding agent
Deng the bead of pressing, therefore, can be produced with substantial amounts of dust while material is heated generation reduction reaction.Mixing
Flue gas passes through fin structure, to realize settling the effect of dust.
Embodiments in accordance with the present invention, by gaseous fuel, air and/or oxygen-enriched air by the heat storage after accumulation of heat
It is used for rotary hearth furnace as fuel after being preheated.
According to a particular embodiment of the invention, the fuel temperature after preheating is 800~1100 DEG C, the running temperature of rotary hearth furnace
It it is 1200~1400 DEG C, the flue-gas temperature of cooling is 200~400 DEG C.High-temperature flue gas by accumulation of heat reclaim be cooled to 200 DEG C~
Denitration process are carried out into denitration pipeline after 400 DEG C, denitration process, energy-efficient, environmental protection are carried out after abundant recovery waste heat again.
Specifically, rotary hearth furnace uses heat storage type combustion mode, by the heat produced during gas fuel combustion
Material in stove, the gaseous fuel and/or air for participating in burning is heated by the heat storage after recovery high-temperature flue gas waste heat respectively, can be by
Gaseous fuel and/or air are preheated to 800~1100 DEG C or so, 1200 DEG C~1400 DEG C of rotary hearth furnace running temperature respectively.Flue gas
The main CO by being produced in combustion process2, the CO compositions that are thermally generated of the carbon in nitrogen oxides and material, be also accompanied by stove
The a large amount of dust produced during material reaction.From rotary hearth furnace out, after heat storage recovery waste heat, temperature is reduced high-temperature flue gas
To 200~400 DEG C.Meanwhile, heat storage own temperature gradually rises so that be overlying on the reducing agent precursor layer of heat storage inner surface
Thermally decomposed to yield reducing agent ammonia.After obtaining reducing agent, the flue gas after cooling is uniformly mixed into denitration pipe rapidly with reducing agent
Road, first carries out flue gas ash removal in decanting zone, and the flue gas after dedusting enters denitration region with reducing agent, and the nitrogen oxides in flue gas is de-
Reacted with reducing agent in the presence of denox catalyst, or N is generated with the reducibility gas CO reactions in flue gas2, reach removing nitrogen
Oxide is the purpose of denitrating flue gas.By adding carbide slag, the accumulation of heat/exothermicity of the heat storage be improved significantly, and
Significantly improve the wearability and corrosion resistance of catalyst.The method saves spray ammonia equipment, and reducing agent mixes more equal with flue gas
Even, denitration reaction is more thorough, and denitration efficiency is up to more than 98%, and energy-conserving and environment-protective.
Embodiments in accordance with the present invention, above-mentioned rotary hearth furnace flue gas denitrification system and method can also have following advantages extremely
It is one of few：
(1) reducing agent is directly overlying on heat storage inner surface, reducing agent precursor decomposes product in the presence of high-temperature flue gas
Raw reducing agent, the reducing agent is well mixed with flue gas, under the denitrating catalyst effect of denitration region, denitration can fully occur
Reaction, denitration efficiency is higher, and without setting individually spray ammonia equipment, system arrangement is more flexible while save space.
(2) high-temperature flue gas carry out denitration reaction after accumulation of heat is reclaimed and is cooled to 200 DEG C~400 DEG C into denitration pipeline,
Denitration process, energy-efficient, environmental protection are carried out again after abundant recovery waste heat.
(3) flue gas blowback device is provided with denitration pipeline, the CO in flue gas and flue gas to be discharged is comprehensively utilized,
The carrying out of dust and reinforcement denitration reaction in appropriate removing flue gas.
The solution of the present invention is explained below in conjunction with embodiment.It will be understood to those of skill in the art that following
Embodiment is merely to illustrate the present invention, and should not be taken as limiting the scope of the invention.Unreceipted particular technique or bar in embodiment
Part, carried out according to the technology or condition described by document in the art or according to product description.Agents useful for same or instrument
The unreceipted production firm person of device, be can by city available from conventional products.
Embodiment 1
(1) direct reduction iron making stove directly heats mode for gas fuel combustion, and raw material is low-grade iron ore stone flour in stove
The bead of the pressing such as material and carbon, binding agent, running temperature is 1300 DEG C.Gaseous fuel is by being arranged on the burning of body of heater side wall
Mouth sprays into burning in stove, and material is heated generation direct reduction reactor in stove, obtains the reduced iron of iron content rate 92%.Carbon in material
CO is generated with after iron ore reaction, is discharged out of the furnace together with the flue gas produced with gas fuel combustion.
(2) high-temperature flue gas from rotary hearth furnace out, after heat storage recovery waste heat, temperature is reduced to 250 DEG C, meanwhile, accumulation of heat
Body own temperature is raised so that the reducing agent presoma for being overlying on heat storage inner surface is heated and is decomposed into reducing agent ammonia, after cooling
Flue gas together enters denitration pipeline with reducing agent.Complete equal under the fin structure effect that the two is set in denitration pipeline dedusting area
Even mixing, and dust sedimentation, the mixed gas of more pure flue gas (without dust) and reducing agent are obtained, then in air inducing
Enter denitration region in the presence of machine, denitration reaction is carried out in the presence of denitrating catalyst, after the nitrogen oxides in removing flue gas
Discharge, removal efficiency is up to 98%.
Using electron-beam vapor deposition method, carry out directly heating evaporation reducing agent precursor under vacuum using electron beam
(ammonia salt), is vaporized and is transported to honeycomb skin, condenses to form reducing agent precursor film on honeycomb heat accumulation body surface, thin
Film thickness is 2mm.After the partial cell heat storage is heated, reducing agent precursor film thereon is thermally decomposed to generate reducing agent
Ammonia.
Heat storage composition is as follows：
Inorganic powder：Load capacity is 65 mass %, including：Flint clay, cordierite, kaolin and quartz, wherein burnt precious
The load capacity of stone is 30 mass %, and the load capacity of cordierite is 25 mass %, and kaolinic load capacity is 8 mass %, quartzy
Load capacity is 20 mass %；
Additive：Load capacity is 3 mass %, including：Methylcellulose and glycerine, wherein, the load capacity of glycerine is 1.5
Quality %, the load capacity of methylcellulose is 4.5 mass %；
Carbide slag：Load capacity is 8 mass %；
Heat storage is obtained by following manner：
1) inorganic powder, ceramic powders, carbide slag and additive are carried out into batch mixing, ball milling 4 hours, and adds the water to carry out
Refining 20 minutes is mediated, to obtain pug；
2) by pug old 40 hours at 20 DEG C, refined again and extruded, obtain embryo material；And
3) embryo material is shaped, then is dried at 100 DEG C 36 hours, be finally calcined 40 hours at 1250 DEG C, so as to
Obtain heat storage.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combined in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of rotary hearth furnace flue gas denitrification system, it is characterised in that including：
Heat storage, the heat storage includes：
Smoke inlet, the smoke inlet is connected with the rotary hearth furnace nozzle, and the flue gas feeding for being suitable to produce rotary hearth furnace is described
Inside heat storage, to make the flue gas cool-down and recovery waste heat；
Exhanst gas outlet；And
Reducing agent precursor layer, the reducing agent precursor layer is overlying on the heat storage inner surface, the reducing agent precursor layer
It is made up of reducing agent presoma, is suitable to using the fume afterheat so that the reducing agent presoma reacts, be reduced
Agent,
Denitration pipeline, the denitration pipeline is connected with the exhanst gas outlet, be suitable to make the flue gas discharged by the exhanst gas outlet and
The mixed flue gas of reducing agent composition carry out denitration reaction, so as to the flue gas after being purified.
2. system according to claim 1, it is characterised in that the denitration pipeline includes：
Decanting zone, the decanting zone is connected with the exhanst gas outlet, is suitable to carry out dedusting to the mixed flue gas；And
Denitration region, the denitration region is connected with the decanting zone, is suitable to make the mixed flue gas after the dedusting to carry out denitration reaction,
Preferably,
The denitration pipeline further includes flue gas blowback device, the two ends of the flue gas blowback device respectively with the decanting zone
It is connected with the denitration region, is suitable to for flue gas blowback after the purification of part to enter the decanting zone, to carry out dedusting.
3. system according to claim 1, it is characterised in that the inner-walls of duct of the decanting zone is provided with fin structure.
4. system according to claim 1, it is characterised in that the heat storage is in spherical, strip or cellular, preferably honeybee
Nest shape,
It is highly preferred that the cellular heat storage is in positive six side cube, size is 450mm × 450mm × 200mm, honeycomb aperture
Not less than 32mm.
5. system according to claim 1, it is characterised in that the reducing agent precursor layer thickness is 1~5mm.
6. the method that rotary hearth furnace flue gas denitrification system described in a kind of any one of utilization claim 1~5 processes flue gas, its feature exists
In, including：
The flue gas is passed through in the heat storage by the smoke inlet, makes the flue gas cool-down and recovery waste heat, while covering
Reducing agent, the reducing agent and the institute by cooling are thermally decomposed to yield in the reducing agent precursor layer of the heat storage inner surface
Flue gas mixing is stated, mixed flue gas are obtained；And
The mixed flue gas is passed through in the denitration pipeline by the exhanst gas outlet, denitration reaction is carried out, to be purified
Flue gas afterwards.
7. method according to claim 6, it is characterised in that further include：
The mixed flue gas are made to be passed through the decanting zone by the exhanst gas outlet, the dust in the mixed flue gas is in the sedimentation
The lower sedimentation of fin structure effect of area's inner-walls of duct, to carry out dedusting；
The mixed flue gas after the dedusting is passed through the denitration region, carry out denitration reaction, so as to the flue gas after being purified；
Optionally, by gaseous fuel, air and/or oxygen-enriched air after the heat storage after accumulation of heat is preheated be used for turn
Bottom stove,
Preferably, the fuel temperature after the preheating is 800~1100 DEG C, and the running temperature of the rotary hearth furnace is 1200~1400
DEG C, the flue-gas temperature of the cooling is 200~400 DEG C.
8. method according to claim 6, it is characterised in that the heat storage includes：Inorganic powder, carbide slag and add
Plus agent, based on the gross mass of the heat storage, the load capacity of the inorganic powder is 50~100 mass %, the additive
Load capacity is 0~10 mass %, and the load capacity of the carbide slag is 5~10 mass %,
Optionally, the inorganic powder includes：Flint clay, cordierite, kaolin and quartz, based on the total of the inorganic powder
Quality, the load capacity of the flint clay is 20~50 mass %, and the load capacity of the cordierite is 15~40 mass %, the height
The load capacity of ridge soil is 6~20 mass %, and the load capacity of the quartz is 15~30 mass %；
Optionally, the additive includes：Binding agent, lubricant and plasticising NMF, based on the gross mass of the heat storage,
The load capacity of the binding agent, lubricant and plasticising NMF is separately 1~5 mass %, and the binding agent is methyl
Cellulose, the lubricant and plasticising NMF are glycerine.
9. method according to claim 6, it is characterised in that the heat storage is obtained by following manner：
The inorganic powder, carbide slag and additive are carried out into batch mixing, ball milling, and adds the water to carry out kneading refining, so as to
To pug；
By the pug carry out it is old, refine and extrude, obtain embryo material；And
The embryo material is shaped, dried and is calcined, to obtain the heat storage,
Preferably,
The total time of the batch mixing and ball milling is 3~4 hours；
The kneading refining time is 20 minutes；
It is described it is old be temperature be 15~25 DEG C at carry out 24~48 hours；
The drying is to be carried out at 90~120 DEG C 36 hours；
The roasting is to be carried out at 1200~1400 DEG C 36~48 hours.
10. method according to claim 6, it is characterised in that the reducing agent precursor layer is by using electron beam
Evaporation so that reducing agent presoma is overlying on the heat storage inner surface and is formed,
Optionally,
The reducing agent presoma is nitrogen-containing compound, preferably ammonium salt or urea, it is highly preferred that the ammonium salt is ammonium carbonate or carbon
Sour hydrogen ammonium.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108611458A (en) * | 2018-05-18 | 2018-10-02 | 钢研晟华科技股份有限公司 | A kind of method of rotary hearth furnace processing solid waste |
| CN113913578A (en) * | 2021-08-16 | 2022-01-11 | 北京科技大学 | Method for increasing temperature of molten iron in molten pool by using high-temperature exhaust flue gas |
| CN117482747A (en) * | 2023-12-27 | 2024-02-02 | 河南环碧环保工程设备有限公司 | System and method for treating glass kiln total oxygen kiln flue gas |
-
2016
- 2016-12-26 CN CN201611218003.8A patent/CN106731561A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108611458A (en) * | 2018-05-18 | 2018-10-02 | 钢研晟华科技股份有限公司 | A kind of method of rotary hearth furnace processing solid waste |
| CN108611458B (en) * | 2018-05-18 | 2020-03-20 | 钢研晟华科技股份有限公司 | Method for treating solid waste by rotary hearth furnace |
| CN113913578A (en) * | 2021-08-16 | 2022-01-11 | 北京科技大学 | Method for increasing temperature of molten iron in molten pool by using high-temperature exhaust flue gas |
| CN113913578B (en) * | 2021-08-16 | 2022-08-23 | 北京科技大学 | Method for increasing temperature of molten iron in molten pool by using high-temperature exhaust flue gas |
| CN117482747A (en) * | 2023-12-27 | 2024-02-02 | 河南环碧环保工程设备有限公司 | System and method for treating glass kiln total oxygen kiln flue gas |
| CN117482747B (en) * | 2023-12-27 | 2024-04-30 | 河南环碧环保工程设备有限公司 | System and method for treating glass kiln total oxygen kiln flue gas |
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