CN206404560U - Rotary hearth furnace flue gas denitrification system - Google Patents

Rotary hearth furnace flue gas denitrification system Download PDF

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Publication number
CN206404560U
CN206404560U CN201621441222.8U CN201621441222U CN206404560U CN 206404560 U CN206404560 U CN 206404560U CN 201621441222 U CN201621441222 U CN 201621441222U CN 206404560 U CN206404560 U CN 206404560U
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flue gas
reducing agent
heat storage
denitration
hearth furnace
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吴道洪
郭科宏
王宁
王东方
宋敏洁
杨玉地
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Shenwu Technology Group Corp Co Ltd
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Shenwu Technology Group Corp Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals

Abstract

The utility model proposes a kind of rotary hearth furnace flue gas denitrification system.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 suitable for rotary hearth furnace is produced 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, suitable for causing the reducing agent presoma to react using the fume afterheat, reducing agent is obtained, denitration pipeline, the denitration pipeline is connected with the exhanst gas outlet, denitration reaction is carried out suitable for the mixed flue gas that the flue gas and reducing agent that make to be discharged by the exhanst gas outlet are constituted, so as to the flue gas after being purified.System of the present utility model eliminates ammonia-gas spraying device, and reducing agent is mixed 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

Rotary hearth furnace flue gas denitrification system
Technical field
The utility model is related to derived energy chemical field.Specifically, the utility model is related to rotary hearth furnace flue gas denitrification system.
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, participate in burning air in 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% directly burns, 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 the important topic that atmospheric environment is administered.
Denitrating flue gas belongs 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 still has much room for improvement at present.
Utility model content
The utility model is intended at least solve one of technical problem in correlation technique to a certain extent.Therefore, this reality It is to propose a kind of rotary hearth furnace flue gas denitrification system with a new purpose.
The utility model proposes a kind of rotary hearth furnace flue gas denitrification system.According to embodiment of the present utility model, the system System includes:Heat storage, the heat storage includes:Smoke inlet, the smoke inlet is connected with the rotary hearth furnace nozzle, suitable for inciting somebody to action The flue gas that rotary hearth furnace is produced 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, and the reducing agent precursor layer is by also Former agent presoma is constituted, and suitable for causing the reducing agent presoma to react using the fume afterheat, obtains reducing agent, is taken off Nitre pipeline, the denitration pipeline is connected with the exhanst gas outlet, suitable for the flue gas and reducing agent for making to be discharged by the exhanst gas outlet The mixed flue gas of composition carries out denitration reaction, so as to the flue gas after being purified.
Thus, according to the rotary hearth furnace flue gas denitrification system of the utility model embodiment by the way that high-temperature flue gas is passed through into accumulation of heat Body, heat storage reclaims the heat in high-temperature flue gas, and heat storage own temperature gradually rises while flue-gas temperature is reduced so that cover Reducing agent is thermally decomposed to yield in the reducing agent precursor layer of heat storage inner surface.Reducing agent together enters with the flue gas after cooling Enter denitration pipeline, denitration reaction is carried out, so as to the flue gas after being purified.The system eliminates ammonia-gas spraying device, and reducing agent with Flue gas is mixed evenly, and denitration reaction is more thorough, and removal efficiency is up to more than 98%, and energy-conserving and environment-protective.
According to embodiment of the present utility model, above-mentioned rotary hearth furnace flue gas denitrification system can also have following supplementary technology special Levy:
According to embodiment of the present utility model, the denitration pipeline includes:Decanting zone, the decanting zone goes out with the flue gas Mouth is connected, suitable for carrying out dedusting to the mixed flue gas;And denitration region, the denitration region is connected with the decanting zone, is suitable to The mixed flue gas after the dedusting is set to carry out denitration reaction.Thereby, it is possible to realize denitrating flue gas and dedusting.
According to embodiment of the present utility model, the denitration pipeline further comprises:Flue gas blowback device, the flue gas is returned The two ends of blowing apparatus are connected with the decanting zone and the denitration region respectively, suitable for flue gas blowback after the purification of part is entered into institute Decanting zone is stated, to carry out dedusting.Partial fume after denitration process is returned, and regularly decanting zone is carried out at purging ash disposal Reason, can moderately be lowered into the dust content of denitrating system, meanwhile, the CO in the flue gas is reacted Catalytic Decomposition of Nitric Oxide Favorably, the reactivity of denitrating catalyst can be improved well.
According to embodiment of the present utility model, the inner-walls of duct of the decanting zone is provided with fin structure.Thus, after cooling Flue gas mixed evenly in the presence of fin with reduction agent composition, and in this region, its flow velocity slows down, the powder in flue gas Dirt will settle down.
According to embodiment of the present utility model, 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.
According to embodiment of the present utility model, the cellular heat storage be in positive six side cube, size be 450mm × 450mm × 200mm, honeycomb aperture is not less than 32mm.
According to embodiment of the present utility model, the reducing agent precursor layer thickness is 1~5mm.Thus, body before reducing agent Body thin film is thermally decomposed to generate reducing agent, can substitute the ammonia-gas spraying device in traditional denitrating system.
Additional aspect and advantage of the present utility model will be set forth in part in the description, partly by from following description In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
Of the present utility model above-mentioned and/or additional aspect and advantage will from description of the accompanying drawings below to embodiment is combined Become substantially and be readily appreciated that, wherein:
Fig. 1 shows the structural representation of the rotary hearth furnace flue gas denitrification system according to the utility model one embodiment;
Fig. 2 shows the gas circulation schematic diagram according to the utility model one embodiment;
Fig. 3 shows the gas circulation schematic diagram according to another embodiment of the utility model;
Fig. 4 shows the schematic flow sheet of the rotary hearth furnace denitration method for flue gas according to the utility model one embodiment;With And
Fig. 5 shows the schematic flow sheet of the rotary hearth furnace denitration method for flue gas according to the utility model another embodiment.
Embodiment
Embodiment of the present utility model is described below in detail.The embodiments described below is exemplary, is only used for explaining The utility model, and it is not intended that to limitation of the present utility model.
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, define " first ", the feature of " second " can be with Express or implicitly include one or more this feature.Further, in description of the present utility model, unless otherwise Illustrate, " multiple " are meant that two or more.
In description of the present utility model, it is to be understood that unless otherwise clearly defined and limited, term " connected " It should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally;Can mechanically connect, It can also be electrical connection;Can be joined directly together, can also be indirectly connected to by intermediary, can be two element internals Connection or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, Concrete meaning of the above-mentioned term in the utility model can be understood as the case may be.
Rotary hearth furnace flue gas denitrification system
The utility model proposes a kind of rotary hearth furnace flue gas denitrification system.According to embodiment of the present utility model, referring to figure 1, the system includes:Heat storage 100 and denitration pipeline 200.
According to embodiment of the present utility model, heat storage 100 includes:Smoke inlet 101, reducing agent precursor layer are (in figure It is not shown) and exhanst gas outlet 103.
According to specific embodiment of the utility model, smoke inlet 101 is connected with the nozzle 102 of rotary hearth furnace 300, suitable for inciting somebody to action Inside the flue gas feeding heat storage that rotary hearth furnace is produced, to make flue gas cool-down and recovery waste heat.
According to specific embodiment of the utility model, reducing agent precursor layer is overlying on before the inner surface of heat storage 100, reducing agent Drive body layer to be made up of reducing agent presoma, suitable for causing reducing agent presoma to react using fume afterheat, obtain reducing agent.
Specifically, the high-temperature flue gas discharged by rotary hearth furnace nozzle enters 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 mix with flue gas, be easy to follow-up denitration process.
According to specific embodiment of the utility model, heat storage 100 is in spherical, strip or cellular.It is new according to this practicality The preferred embodiment of type, 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, cigarette is prevented Gas blocks honeycomb hole.
According to specific embodiment of the utility model, reducing agent precursor layer thickness is 1~5mm.Thus, it is easy to reducing agent Presoma is thermally decomposed, and obtains reducing agent.
According to embodiment of the present utility model, denitration pipeline 200 is connected with exhanst gas outlet 103, suitable for making by exhanst gas outlet The mixed flue gas of flue gas and the reducing agent composition of discharge carries out denitration reaction, so as to the flue gas after being purified.
According to specific embodiment of the utility model, denitration pipeline 200 includes decanting zone 201 and denitration region 202.
According to specific embodiment of the utility model, decanting zone 201 is connected with the exhanst gas outlet 103, suitable for mixing Flue gas carries out dedusting.
According to specific embodiment of the utility model, the inner-walls of duct of decanting zone 201 is provided with fin structure 211.Thus, Flue gas after cooling is mixed evenly with reduction agent composition in the presence of fin, and in this region, its flow velocity slows down, flue gas In dust settling get off, separately set dust arrester so as to eliminate.
According to specific embodiment of the utility model, denitration region 202 is connected with decanting zone 201, mixed after dedusting suitable for making Close flue gas and carry out denitration reaction.The mixed gas of flue gas and reducing agent after removing dust enters denitration in the presence of air-introduced machine Area, is discharged, removal efficiency is reachable after the nitrogen oxides in denitration reaction, removing flue gas is carried out in the presence of denitrating catalyst More than 98%.
According to specific embodiment of the utility model, denitration pipeline 200 further comprises flue gas blowback device 203, flue gas The two ends of blowback device 203 are connected with decanting zone 201 and denitration region 202 respectively, heavy suitable for Partial cleansing rear flue gas blowback is entered Area drops, to carry out dedusting.Partial fume after denitration process is returned, and purging ash disposal processing 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 reacts favourable to Catalytic Decomposition of Nitric Oxide, The reactivity of denitrating catalyst can be improved well.
According to specific embodiment of the utility model, referring to Fig. 2 and 3, heat storage absorbs the waste heat after high-temperature flue gas to gas Fluid fuel 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 Combustion reaction occurs for stove, and the high-temperature flue gas that gaseous fuel, air and/or the oxygen-enriched air and burning for participating in burning are produced passes through Four-way reversing valve is alternately accomplished accumulation of heat, warm.
Specifically, according to the rotary hearth furnace flue gas denitrification system of the utility model embodiment by the way that reducing agent precursor layer is covered In the heat storage inner surface, when high-temperature flue gas is passed through heat storage, heat storage reclaims the heat in high-temperature flue gas, flue-gas temperature drop Heat storage own temperature is gradually risen while low so that reducing agent precursor layer is thermally decomposed to yield reducing agent.Reducing agent with The flue gas after cooling and together enter denitration pipeline, first carry out dedusting in decanting zone, the flue gas and reducing agent after dedusting are in denitration Area carries out denitration reaction, so as to the flue gas after being purified.The system eliminates ammonia-gas spraying device, and reducing agent is mixed more with flue gas Uniformly, denitration reaction is more thorough, and removal efficiency is up to more than 98%, and energy-conserving and environment-protective.
Understand for convenience, be described more fully below and handle flue gas using rotary hearth furnace flue gas denitrification system described above Method.
According to embodiment of the present utility model, referring to Fig. 4, this 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, be overlying on simultaneously The reducing agent precursor layer of heat storage inner surface is thermally decomposed to yield reducing agent, and reducing agent is mixed with the flue gas by cooling, obtained To mixed flue gas.
Specifically, the high-temperature flue gas discharged by rotary hearth furnace nozzle enters 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 mix with flue gas, be easy to follow-up denitration process.
According to specific embodiment of the utility model, heat storage includes:Inorganic powder, carbide slag and additive, based on storage The gross mass of hot body, the load capacity of inorganic powder is 50~100 mass %, and the load capacity of additive is 0~10 mass %, calcium carbide The load capacity of slag 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 holes, acid corrosion-resistant characteristic, therefore, appropriate carbide slag is added in heat storage can be obviously improved storage Specific surface area, accumulation of heat/exothermicity, wearability and the decay resistance of hot body.
According to specific embodiment of the utility model, inorganic powder includes:Flint clay, cordierite, kaolin and quartz, Gross mass based on inorganic powder, the load capacity of flint clay is 20~50 mass %, and the load capacity of cordierite is 15~40 matter % is measured, kaolinic load capacity is 6~20 mass %, and quartzy load capacity is 15~30 mass %.Thus, resulting accumulation of heat Body accumulation of heat/exothermicity, wearability and decay resistance are higher.
According to specific embodiment of the utility model, additive includes:Binding agent, lubricant and plasticising NMF, base In the gross mass of heat storage, binding agent, lubricant and the load capacity for being plasticized NMF are separately 1~5 mass %, are bonded Agent is methylcellulose, and lubricant and plasticising NMF are glycerine.Thus, resulting heat storage accumulation of heat/exothermicity, wear-resisting Property and decay resistance are higher.
According to specific embodiment of the utility model, heat storage is obtained by following manner:By inorganic powder, carbide slag And additive carries out batch mixing, ball milling, and water progress kneading refining is added, to obtain pug;Pug is subjected to old, refining And extrude, obtain embryo material;And embryo material is shaped, dried and is calcined, to obtain heat storage.Thus, it is resulting Heat storage accumulation of heat/exothermicity, wearability and decay resistance are higher.
According to specific embodiment of the utility model, the total time of batch mixing and ball milling is 3~4 hours;Mediate the refining time For 20 minutes;Old carried out 24~48 hours in the case where temperature is 15~25 DEG C;Drying is that progress 36 is small at 90~120 DEG C When;Roasting is carried out 36~48 hours at 1200~1400 DEG C.Thus, resulting heat storage accumulation of heat/exothermicity, wear-resisting Property and decay resistance are higher.
According to specific embodiment of the utility model, reducing agent precursor layer is by using electron-beam vapor deposition method so that Reducing agent presoma is overlying on formed by the heat storage inner surface.Specifically, using electron-beam vapor deposition method, under vacuum Carry out directly heating evaporation reducing agent precursor using electron beam, be vaporized and 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 Reducing agent ammonia is thermally decomposed to generate, the ammonia-gas spraying device in traditional denitrating system can be substituted.
According to specific embodiment of the utility model, reducing agent precursor layer is nitrogen-containing compound, preferably ammonium salt or urea, It is highly preferred that the ammonium salt is ammonium carbonate or ammonium hydrogen carbonate.Reducing agent precursor can be contained by thermal decomposition on this condition Ammoniate, and the compound of the elements such as the 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 by exhanst gas outlet in denitration pipeline, carry out denitration reaction, it is net to obtain Flue gas after change.
According to embodiment of the present utility model, referring to Fig. 5, this method further comprises:
S300 dedustings
In this step, settling the dust that mixed flue gas is passed through in decanting zone, mixed flue gas by the exhanst gas outlet The fin structure effect of area's inner-walls of duct is lower to be settled, to carry out dedusting.Rotary hearth furnace material is iron ore powder and carbon, binding agent Deng the bead of pressing, therefore, it can be produced while material heated generation reduction reaction with substantial amounts of dust.Mixing Flue gas is by fin structure, to realize the effect of sedimentation dust.
According to embodiment of the present utility model, gaseous fuel, air and/or oxygen-enriched air are passed through into the storage after accumulation of heat Hot body preheated after as fuel be used for rotary hearth furnace.
According to specific embodiment of the utility model, the fuel temperature after preheating is 800~1100 DEG C, the operation of rotary hearth furnace Temperature is 1200~1400 DEG C, and the flue-gas temperature of cooling is 200~400 DEG C.High-temperature flue gas reclaims by accumulation of heat and is cooled to 200 DEG C Enter after~400 DEG C after denitration pipeline carries out denitration process, abundant recovery waste heat and carry out denitration process, energy-efficient, environmental protection again.
Specifically, rotary hearth furnace uses heat storage type combustion mode, passes through 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 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.High-temperature flue gas comes out from rotary hearth furnace, after heat storage recovery waste heat, temperature reduction 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.Obtain after reducing agent, the flue gas after cooling is uniformly mixed into rapidly into denitration pipe with reducing agent Road, first carries out flue gas ash removal in decanting zone, and the nitrogen oxides that the flue gas after dedusting enters in denitration region, flue gas with reducing agent is de- Reacted in the presence of denox catalyst with reducing agent, 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, accumulation of heat/exothermicity of the heat storage be improved significantly, and Significantly improve the wearability and corrosion resistance of catalyst.This 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.
According to embodiment of the present utility model, above-mentioned rotary hearth furnace flue gas denitrification system can also have following advantages at least One of:
(1) reducing agent is directly overlying on to heat storage inner surface, reducing agent precursor decomposes production 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, can fully occur denitration Reaction, denitration efficiency is higher, and without setting individually spray ammonia equipment, system arrangement is more flexible while saving space.
(2) high-temperature flue gas enters denitration pipeline progress denitration reaction after accumulation of heat is reclaimed and is cooled to 200 DEG C~400 DEG C, Denitration process, energy-efficient, environmental protection are carried out again after abundant recovery waste heat.
(3) CO in flue gas blowback device, comprehensive utilization flue gas to be discharged and flue gas is provided with denitration pipeline, The progress of dust and reinforcement denitration reaction in appropriate removing flue gas.
Scheme of the present utility model is explained below in conjunction with embodiment.It will be understood to those of skill in the art that under The embodiment in face is merely to illustrate the utility model, and should not be regarded as limiting scope of the present utility model.It is unreceipted in embodiment Particular technique or condition, carried out according to the technology or condition described by document in the art or according to product description. Agents useful for same or the unreceipted production firm person of instrument, being can be by the conventional products of acquisition purchased in market.
Embodiment 1
(1) direct reduction iron making stove is that to directly heat raw material in mode, stove be low-grade iron ore stone flour to gas fuel combustion 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, which is sprayed into stove, to burn, and material is heated in stove occurs direct reduction reactor, obtains the reduced iron of iron content rate 92%.Carbon in material With generating CO after iron ore reaction, discharged out of the furnace together with the flue gas that gas fuel combustion is produced.
(2) high-temperature flue gas comes out from rotary hearth furnace, after heat storage recovery waste heat, and temperature is reduced to 250 DEG C, meanwhile, accumulation of heat Body own temperature is raised so that be overlying on heat storage inner surface reducing agent presoma it is heated be decomposed into reducing agent ammonia, after cooling Flue gas together enters denitration pipeline with reducing agent.Complete equal under the two fin structure set in denitration pipeline dedusting area effect Even mixing, and dust sedimentation, the mixed gas of more pure flue gas (no dust) and reducing agent is obtained, then in air inducing Enter denitration region in the presence of machine, carried out in the presence of denitrating catalyst after the nitrogen oxides in denitration reaction, 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 subjected to batch mixing, ball milling 4 hours, and add water progress Refining 20 minutes is mediated, to obtain pug;
2) by pug old 40 hours at 20 DEG C, refined and extruded again, obtain embryo material;And
3) embryo material is shaped, then dried 36 hours at 100 DEG C, is 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 the spy that the embodiment or example are described Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area Technical staff the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification can be entered Row is combined and combined.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in scope of the present utility model It is interior above-described embodiment to be changed, changed, replaced and modification.

Claims (8)

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;
Exhanst gas outlet;And
Reducing agent precursor layer, the reducing agent precursor layer is overlying on the heat storage inner surface,
Denitration pipeline, the denitration pipeline is connected with the exhanst gas outlet.
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;And
Denitration region, the denitration region is connected with the decanting zone.
3. system according to claim 2, it is characterised in that the denitration pipeline further comprises:
Flue gas blowback device, the two ends of the flue gas blowback device are connected with the decanting zone and the denitration region respectively.
4. system according to claim 2, it is characterised in that the inner-walls of duct of the decanting zone is provided with fin structure.
5. system according to claim 1, it is characterised in that the heat storage is in spherical, strip or cellular.
6. system according to claim 1, it is characterised in that the heat storage is in cellular.
7. system according to claim 6, it is characterised in that the cellular heat storage is in positive six side cube, size is 450mm × 450mm × 200mm, honeycomb aperture is not less than 32mm.
8. system according to claim 1, it is characterised in that the reducing agent precursor layer thickness is 1~5mm.
CN201621441222.8U 2016-12-26 2016-12-26 Rotary hearth furnace flue gas denitrification system Active CN206404560U (en)

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