CN206660914U - The system of rotary hearth furnace flue gas accumulation of heat denitration - Google Patents

The system of rotary hearth furnace flue gas accumulation of heat denitration Download PDF

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Publication number
CN206660914U
CN206660914U CN201621440725.3U CN201621440725U CN206660914U CN 206660914 U CN206660914 U CN 206660914U CN 201621440725 U CN201621440725 U CN 201621440725U CN 206660914 U CN206660914 U CN 206660914U
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heat
denitration
accumulation
heat storage
reducing agent
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吴道洪
王宁
郭科宏
钟贵全
陈珊
王志军
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Shenwu Technology Group Corp Co Ltd
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Shenwu Technology Group Corp Co Ltd
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Abstract

The utility model discloses the system of rotary hearth furnace flue gas accumulation of heat denitration, the system includes:Accumulation of heat denitrification apparatus, the accumulation of heat denitrification apparatus sets gradually heat-accumulating area and accumulation of heat denitration region along flow of flue gas direction, wherein, the heat-accumulating area has the air outlet slit after smoke inlet and preheating, the smoke inlet is connected with the exhaust opening of rotary hearth furnace, air outlet slit after the preheating is connected with the nozzle of rotary hearth furnace, also, the heat-accumulating area is provided with and carries reducing agent precursor heat storage;The denitration region has the first gas port, and is provided with denitration heat storage, and the load reducing agent precursor heat storage and the denitration heat storage are honeycomb ceramics shape;Three-way diverter valve, the three-way diverter valve have air intake, the second gas port and an exhanst gas outlet, second gas port and are connected with first gas port of the denitration region;Dust arrester, the dust arrester have gas access and purified gas outlet, and the gas access is connected with the exhanst gas outlet.

Description

The system of rotary hearth furnace flue gas accumulation of heat denitration
Technical field
The system that the utility model is related to rotary hearth furnace flue gas accumulation of heat denitration.
Background technology
With the rapid development of 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, in primary energy and the power generation energy resource composition in China, coal occupies definitely Leading position.And the coal in China more than 80% directly burns, particularly for power station, Industrial Boiler and civil boiler In.Therefore, in considerably long period, the NO in flue gasXDischarge is to cause China air NOXOne principal element of pollution, how Reduce the NO of fixed source emissionXIt 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 the only selective catalytic reduction for obtaining a large amount of commercial Applications at present is urged with selectively non- Change reducing process, other method is in experimental study stage or pilot scale stage at present.
Utility model content
The utility model is intended at least solve one of technical problem present in prior art.It is therefore, of the present utility model One purpose is to propose a kind of system of rotary hearth furnace flue gas accumulation of heat denitration, carries reducing agent precursor heat storage by body before reducing agent Body overlays on honeycomb heat accumulation body surface, denitrating flue gas is eliminated Pen An areas, and reducing agent mixes evenly with flue gas, denitration reaction It is more thorough.Meanwhile the system uses the honeycomb heat accumulation body added with carbide slag, has good anti-blocking performance, suitable for dust-laden Measure larger flue gas, meanwhile, accumulation of heat/exothermicity of the denitration heat storage be improved significantly, and significantly improve catalyst Wearability and corrosion resistance.
According to one side of the present utility model, what the utility model provided a kind of rotary hearth furnace flue gas accumulation of heat denitration is System.According to embodiment of the present utility model, the system includes:
Accumulation of heat denitrification apparatus, the accumulation of heat denitrification apparatus set gradually heat-accumulating area and accumulation of heat denitration along flow of flue gas direction Area, wherein, the heat-accumulating area has the air outlet slit after smoke inlet and preheating, the exhaust opening of the smoke inlet and rotary hearth furnace It is connected, the air outlet slit after the preheating is connected with the nozzle of rotary hearth furnace, also, the heat-accumulating area is provided with body before load reducing agent Body heat storage;The denitration region has the first gas port, and is provided with denitration heat storage, it is described load reducing agent precursor heat storage and The denitration heat storage is honeycomb ceramics shape;
Three-way diverter valve, the three-way diverter valve have air intake, the second gas port and exhanst gas outlet, second gas port It is connected with first gas port with the denitration region;
Dust arrester, the dust arrester have gas access and purified gas outlet, the gas access and institute Exhanst gas outlet is stated to be connected,
Wherein,
The denitration heat storage includes:
Heat storage matrix, the heat storage matrix include the first inorganic powder;And
Loading mixture, the loading mixture are supported on the heat storage matrix, and the loading mixture includes:
Denitrating catalyst;
First additive, first additive contain carbide slag,
The load reducing agent precursor heat storage includes:
Accumulation of heat honeycomb ceramics, the accumulation of heat honeycomb ceramics include the second inorganic powder and the Second addition containing carbide slag;With And
Reducing agent precursor film, the reducing agent precursor film are covered on the accumulation of heat honeycomb ceramics, wherein, reduction Agent precursor is to be produced ammonia by thermal decomposition and do not produce the compound of sulfur-bearing and chlorine.
According to the system of the rotary hearth furnace flue gas accumulation of heat denitration of the utility model embodiment, carrying reducing agent precursor heat storage will Reducing agent precursor overlays on honeycomb heat accumulation body surface, denitrating flue gas is eliminated Pen An areas, and reducing agent mixed with flue gas it is more equal Even, denitration reaction is more thorough.Meanwhile the system uses the honeycomb heat accumulation body added with carbide slag, has good anti-blocking performance, Suitable for the flue gas that dustiness is larger, meanwhile, accumulation of heat/exothermicity of the denitration heat storage be improved significantly, and significantly carry The high wearability and corrosion resistance of catalyst.
Optionally, the load reducing agent precursor heat storage and the denitration heat storage are cellular cuboid.
Optionally, the size of the cellular cuboid is 400mm × 500mm × 150mm, and honeycomb aperture is not less than 40mm。
Optionally, first inorganic powder and second inorganic powder include flint clay, cordierite, kaolin and Quartz.
Optionally, the flint clay, the cordierite, the kaolin and the quartzy mass ratio are (20-50): (15-40):(6-20):(15-30).
Optionally, first additive and the Second addition include carbide slag, binding agent, lubricant and plasticising NMF.
Optionally, the quality of the carbide slag and the binding agent, the lubricant and the plasticising NMF gross mass Than for (5-10):(1-5).
Optionally, the reducing agent precursor is at least one selected from ammonium carbonate, ammonium hydrogen carbonate and urea.
Optionally, the carrier of the denitrating catalyst is titania-alumina composite oxides, and active component, which includes, lives Property charcoal, Supplementary active ingredients include vanadic anhydride-tungstic acid composite oxides, and auxiliary agent includes iron and lanthanum.
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 in the description from combination accompanying drawings below to embodiment Become obvious and be readily appreciated that, wherein:
Fig. 1 shows the structural representation of the system of the rotary hearth furnace flue gas accumulation of heat denitration according to the utility model one embodiment Figure;
Fig. 2 is shown handles cigarette according to the system using rotary hearth furnace flue gas accumulation of heat denitration of the utility model one embodiment The schematic flow sheet of the method for gas.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng The embodiment for examining accompanying drawing description is exemplary, is only used for explaining the utility model, and it is not intended that to of the present utility model Limitation.
In description of the present utility model, term " longitudinal direction ", " transverse direction ", " on ", " under ", "front", "rear", "left", "right", The orientation or position relationship of the instruction such as " vertical ", " level ", " top ", " bottom " be based on orientation shown in the drawings or position relationship, It is for only for ease of description the utility model rather than requires that the utility model must be with specific azimuth configuration and operation, therefore 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 instruction or hint 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.
According to one side of the present utility model, what the utility model provided a kind of rotary hearth furnace flue gas accumulation of heat denitration is System.With reference to figure 1, according to embodiment of the present utility model, the system of the rotary hearth furnace flue gas accumulation of heat denitration is explained, should System includes:Accumulation of heat denitrification apparatus 100, three-way diverter valve 200 and dust arrester 300.
According to the system of the rotary hearth furnace flue gas accumulation of heat denitration of the utility model embodiment, carrying reducing agent precursor heat storage will Reducing agent precursor overlays on honeycomb heat accumulation body surface, denitrating flue gas is eliminated Pen An areas, and reducing agent mixed with flue gas it is more equal Even, denitration reaction is more thorough.Meanwhile the system uses the honeycomb heat accumulation body added with carbide slag, has good anti-blocking performance, Suitable for the flue gas that dustiness is larger, meanwhile, accumulation of heat/exothermicity of the denitration heat storage be improved significantly, and significantly carry The high wearability and corrosion resistance of catalyst.
For the ease of understanding the system of the rotary hearth furnace flue gas accumulation of heat denitration, each device of the system is solved one by one below Release explanation:
Accumulation of heat denitrification apparatus 100:According to embodiment of the present utility model, the accumulation of heat denitrification apparatus 100 is along flow of flue gas side To setting gradually heat-accumulating area 110 and accumulation of heat denitration region 120, wherein, there is the air after smoke inlet and preheating to go out for heat-accumulating area 110 Mouthful, smoke inlet is connected with the exhaust opening of rotary hearth furnace, and the air outlet slit after preheating is connected with the nozzle of rotary hearth furnace, also, the storage Hot-zone 110, which is provided with, carries reducing agent precursor heat storage, and high-temperature flue gas carries simultaneously by heat-accumulating area recovery waste heat caused by burning Reducing agent precursor heat storage heats up, and the reducing agent precursor being overlying on thereon decomposes generation ammonia and is mixed to get cigarette containing ammonia with flue gas Gas;The denitration region 120 has the first gas port, and is provided with denitration heat storage, and flue gas containing ammonia enters under the catalysis of denitration heat storage Row reduction denitration process, obtain removing the flue gas of nitrogen oxides.
According to embodiment of the present utility model, carrying reducing agent precursor heat storage includes:Before accumulation of heat honeycomb ceramics and reducing agent Body film, wherein, accumulation of heat honeycomb ceramics includes the second inorganic powder and the Second addition containing carbide slag;Reducing agent precursor Film is covered on the accumulation of heat honeycomb ceramics, wherein, reducing agent precursor is to be produced ammonia by thermal decomposition and do not produce sulfur-bearing and chlorine Compound.Thus, high-temperature flue gas caused by burning is by heat-accumulating area recovery waste heat, while carries reducing agent precursor heat storage liter Temperature, the reducing agent precursor being overlying on thereon decompose generation ammonia and are mixed to get flue gas containing ammonia with flue gas.
According to embodiment of the present utility model, denitration heat storage includes:Heat storage matrix and loading mixture, wherein, store Hot body matrix includes the first inorganic powder;Loading mixture is supported on heat storage matrix, and the loading mixture includes:Denitration is urged Agent and the first additive, wherein, the first additive contains carbide slag.Thus, the denitration heat storage enters one while denitration Walk the waste heat of recovered flue gas.Because carbide slag have that big particle diameter, surface texture be loose concurrently and particle between be randomly distributed many chis Very little larger 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 embodiment of the present utility model, it is honeycomb ceramics shape to carry reducing agent precursor heat storage and denitration heat storage. The catalyst that cellular specific surface area compares other shapes is big, and reducing agent precursor and denitrating catalyst and reaction medium connect Contacting surface is bigger, and catalytic reaction is more efficient.
According to embodiment of the present utility model, the shape for carrying reducing agent precursor heat storage and denitration heat storage can basis Needs of production is selected.According to some embodiments of the utility model, carry reducing agent precursor heat storage and denitration stores Hot body is cellular cuboid, and size typically can be 150mm × 100mm × 100mm, 250mm × 200mm × 100mm etc..Root According to other embodiment of the present utility model, the size of cellular cuboid is 400mm × 500mm × 150mm, and honeycomb aperture Not less than 40mm.Due to containing a large amount of dust in flue gas, preferably using the honeycomb ceramics of large aperture, prevent flue gas from blocking honeycomb hole.
According to embodiment of the present utility model, the first inorganic powder and the second inorganic powder include flint clay, cordierite, Kaolin and quartz.
According to embodiment of the present utility model, flint clay, cordierite, the mass ratio of kaolin and quartz are (20-50): (15-40):(6-20):(15-30).
According to embodiment of the present utility model, the first additive and Second addition include carbide slag, binding agent, lubrication Agent and plasticising NMF.
According to embodiment of the present utility model, carbide slag and binding agent, lubricant and the quality for being plasticized NMF gross mass Than for (5-10):(1-5).
According to embodiment of the present utility model, reducing agent precursor be selected from ammonium carbonate, ammonium hydrogen carbonate and urea at least It is a kind of.Thus, it is heated and easily decomposes, and decompose generation ammonia, and does not generate the members such as the chloride, sulphur that denitrating catalyst can be caused to inactivate The compound of element.
According to embodiment of the present utility model, using electron-beam vapor deposition method, carried out under vacuum using electron beam straight Heating evaporation reducing agent precursor is connect, is vaporized and is transported to denitration honeycomb skin, condenses shape on honeycomb heat accumulation body surface Into reducing agent precursor film.After the partial cell heat storage is heated, reducing agent precursor film thereon is thermally decomposed to generate Reducing agent ammonia, the spray ammonia system in former denitrating system can be substituted.Wherein, during electron beam evaporation plating film, target is banged by electron beam Rear high temperature melting is hit, substrate surface is deposited in the form of molecule or atom vapor.
According to embodiment of the present utility model, the carrier of denitrating catalyst is titania-alumina composite oxides, living Property composition include activated carbon, Supplementary active ingredients include vanadic anhydride-tungstic acid composite oxides, auxiliary agent include iron and Lanthanum.Thus, the hardness of the denitrating catalyst, wearability and corrosion resistance significantly improve, and with good anti-SO2Steamed with water resistant Gas poisoning performance, and denitration effect is good.
Three-way diverter valve 200:According to embodiment of the present utility model, the three-way diverter valve 200 has air intake, second Gas port and exhanst gas outlet, wherein, the second gas port and it is connected with the first gas port of denitration region, the flue gas of the removing nitrogen oxides of cooling Enter dust arrester through three-way diverter valve and carry out purified treatment, the flue gas after being purified, and emptying is drawn using air-introduced machine Afterwards, the valve direction of the three-way diverter valve is converted, air is entered through the three-way diverter valve into the accumulation of heat denitrification apparatus Row the pre-heat treatment, the air after being preheated, the air after the preheating are burnt for rotary hearth furnace.Three-way diverter valve passes through week Phase property conversion valve direction, realize accumulation of heat denitration and the preheating of air of flue gas.
Dust arrester 300:According to embodiment of the present utility model, after the dust arrester 300 has gas access and purification Gas vent, wherein, gas access is connected with exhanst gas outlet, and the flue gas for removing nitrogen oxides enters dedusting through three-way diverter valve Device carries out purified treatment, the flue gas after being purified.
Before understanding that the system of foregoing rotary hearth furnace flue gas accumulation of heat denitration, the utility model provide a kind of utilization The method of the system processing flue gas for the rotary hearth furnace flue gas accumulation of heat denitration stated.It is right according to embodiment of the present utility model with reference to figure 2 The method that flue gas is handled using the system of foregoing rotary hearth furnace flue gas accumulation of heat denitration is explained, and this method includes:
S100 accumulation of heat denitrations
The flue gas that rotary hearth furnace is discharged is delivered to accumulation of heat denitrification apparatus, heat-accumulating area is sequentially entered and carries out accumulation of heat time through heat storage Receive heat and reducing agent precursor is produced ammonia, the flue gas containing ammonia after being cooled by thermal decomposition;Make the flue gas containing ammonia after cooling Into accumulation of heat denitration region, accumulation of heat reduction denitration process is carried out through denitration heat storage, so as to the removing nitrogen oxides that is cooled down Flue gas.Thus, high-temperature flue gas caused by rotary hearth furnace, after the heat-accumulating area recovery waste heat for first passing through accumulation of heat denitrification apparatus, then through denitration Area carries out denitration process, and specifically, the nitrogen oxides in flue gas reacts in the presence of denitrating catalyst with reducing agent ammonia, or With the reducibility gas CO reaction generations N in flue gas2, it is energy-efficient, environmentally friendly.And carrying reducing agent precursor heat storage will reduce Agent precursor overlays on honeycomb heat accumulation body surface, denitrating flue gas is eliminated Pen An areas, and reducing agent mixes evenly with flue gas, takes off Nitre reaction is more thorough.The surface for the denitration heat storage containing enamel that denitration region uses is smooth, wear-resisting simultaneously, and flue gas is without depth Dedusting can carry out denitration reaction, and denitration efficiency is high, also, accumulation of heat again can be also carried out while denitration.It is new according to this practicality The embodiment of type, nitrogen oxides in effluent removal efficiency is up to more than 98%.
According to embodiment of the present utility model, carrying reducing agent precursor heat storage includes:Before accumulation of heat honeycomb ceramics and reducing agent Body film, wherein, accumulation of heat honeycomb ceramics includes the second inorganic powder and the Second addition containing carbide slag;Reducing agent precursor Film is covered on the accumulation of heat honeycomb ceramics, wherein, reducing agent precursor is to be produced ammonia by thermal decomposition and do not produce sulfur-bearing and chlorine Compound.Thus, high-temperature flue gas caused by burning is by heat-accumulating area recovery waste heat, while carries reducing agent precursor heat storage liter Temperature, the reducing agent precursor being overlying on thereon decompose generation ammonia and are mixed to get flue gas containing ammonia with flue gas.
According to embodiment of the present utility model, denitration heat storage includes:Heat storage matrix and loading mixture, wherein, store Hot body matrix includes the first inorganic powder;Loading mixture is supported on heat storage matrix, and the loading mixture includes:Denitration is urged Agent and the first additive, wherein, the first additive contains carbide slag.Thus, the denitration heat storage enters one while denitration Walk the waste heat of recovered flue gas.Because carbide slag have that big particle diameter, surface texture be loose concurrently and particle between be randomly distributed many chis Very little larger 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 embodiment of the present utility model, it is honeycomb ceramics shape to carry reducing agent precursor heat storage and denitration heat storage. The catalyst that cellular specific surface area compares other shapes is big, and reducing agent precursor and denitrating catalyst and reaction medium connect Contacting surface is bigger, and catalytic reaction is more efficient.
According to embodiment of the present utility model, the shape for carrying reducing agent precursor heat storage and denitration heat storage can basis Needs of production is selected.According to some embodiments of the utility model, carry reducing agent precursor heat storage and denitration stores Hot body is cellular cuboid, and size typically can be 150mm × 100mm × 100mm, 250mm × 200mm × 100mm etc..Root According to other embodiment of the present utility model, the size of cellular cuboid is 400mm × 400mm × 100mm, and honeycomb aperture Not less than 30mm.Due to containing a large amount of dust in flue gas, preferably using the honeycomb ceramics of large aperture, prevent flue gas from blocking honeycomb hole.
According to embodiment of the present utility model, the first inorganic powder and the second inorganic powder include flint clay, cordierite, Kaolin and quartz.
According to embodiment of the present utility model, flint clay, cordierite, the mass ratio of kaolin and quartz are (20-50): (15-40):(6-20):(15-30).
According to embodiment of the present utility model, the first additive and Second addition include carbide slag, binding agent, lubrication Agent and plasticising NMF.
According to embodiment of the present utility model, carbide slag and binding agent, lubricant and the quality for being plasticized NMF gross mass Than for (5-10):(1-5).
According to embodiment of the present utility model, reducing agent precursor be selected from ammonium carbonate, ammonium hydrogen carbonate and urea at least It is a kind of.Thus, it is heated and easily decomposes, and decompose generation ammonia, and does not generate the members such as the chloride, sulphur that denitrating catalyst can be caused to inactivate The compound of element.
According to embodiment of the present utility model, using electron-beam vapor deposition method, carried out under vacuum using electron beam straight Heating evaporation reducing agent precursor is connect, is vaporized and is transported to denitration honeycomb skin, condenses shape on honeycomb heat accumulation body surface Into reducing agent precursor film.After the partial cell heat storage is heated, reducing agent precursor film thereon is thermally decomposed to generate Reducing agent ammonia, the spray ammonia system in former denitrating system can be substituted.Wherein, during electron beam evaporation plating film, target is banged by electron beam Rear high temperature melting is hit, substrate surface is deposited in the form of molecule or atom vapor.
According to embodiment of the present utility model, the carrier of denitrating catalyst is titania-alumina composite oxides, living Property composition include activated carbon, Supplementary active ingredients include vanadic anhydride-tungstic acid composite oxides, auxiliary agent include iron and Lanthanum.Thus, the hardness of the denitrating catalyst, wearability and corrosion resistance significantly improve, and with good anti-SO2Steamed with water resistant Gas poisoning performance, and denitration effect is good.
Foregoing accumulation of heat honeycomb ceramics is similar with the structure of heat storage matrix, for the ease of understanding the accumulation of heat honeycomb ceramics and heat storage Matrix, the preparation method of the two is provided herein, specifically included:
(1) refining of heat storage base substrate
By appropriate inorganic powder, ceramic powders, carbide slag, binding agent, plasticising NMF, mix lubricant batch mixing, ball 3-4h is ground, and add appropriate deionized water and carry out kneading refining, kneading time 20min, it is standby to obtain pug.
(2) clod is carried out it is old, old environment temperature be 15~25 DEG C, the old time is 24h~48h, through vacuum fine Refining, vacuum are extruded into the green honeycomb of required specification.
(3) green honeycomb is re-fed into drying machine again and shapes, dries, drying temperature is 90~120 DEG C, drying time For 36h, finished product is burnt under the conditions of 1200 DEG C~1400 DEG C, roasting time is 36~48h.
According to embodiment of the present utility model, the temperature of the flue gas containing ammonia after cooling is 300-700 degrees Celsius.Thus, store The waste heat of the abundant recovered flue gas in hot-zone.
S200 purified treatments
According to embodiment of the present utility model, the flue gas for removing nitrogen oxides is carried out through three-way diverter valve into dust arrester Purified treatment, the flue gas after being purified.
S300 the pre-heat treatments
According to embodiment of the present utility model, the valve direction of three-way diverter valve is converted, air is entered through three-way diverter valve Enter accumulation of heat denitrification apparatus and carry out the pre-heat treatment, the air after being preheated, the air after the preheating is burnt for rotary hearth furnace.
According to embodiment of the present utility model, the temperature of the air after preheating is 900-1100 degrees Celsius.Thus, after preheating Air and preheating after combustion gas burnt in rotary hearth furnace consumed less energy consumption, high combustion efficiency.
Below with reference to specific embodiment, the utility model is illustrated, it is necessary to which explanation is, these embodiments are only It is illustrative, and it is not intended that to limitation of the present utility model.
Embodiment 1
Utilize the cigarette of the system processing direct reduction iron making stove of the rotary hearth furnace flue gas accumulation of heat denitration of the utility model embodiment Gas, wherein direct reduction iron making stove are that gas fuel combustion directly heats mode, in stove raw material be iron ore of low ore grade powder with The bead that the pressings such as carbon, binding agent form, running temperature are 1200 DEG C.Gaseous fuel is sprayed by being arranged on the burner of body of heater side wall Enter in stove and burn, material is heated in stove occurs direct reduction reactor, obtains the reduced iron of iron content rate 90%.Carbon and iron in material CO is generated after ore reaction, is discharged out of the furnace together with flue gas caused by gas fuel combustion.
High-temperature flue gas comes out from rotary hearth furnace, and after hold over system recovery waste heat, temperature takes off after being reduced to 450 DEG C into accumulation of heat Nitre system, while heat is reclaimed in further accumulation of heat, completion denitration reaction removes denitrification in the presence of denitrating catalyst Externally discharge afterwards.The reducing agent is obtained by being covered with the honeycomb heat accumulation body of reducing agent precursor, and high-temperature flue gas is by being covered with also During the honeycomb heat accumulation body of former agent precursor, honeycomb regenerator knows from experience the heat in recovery high-temperature flue gas, while flue-gas temperature declines The own temperature of its heat storage is gradually risen, and the reducing agent precursor being overlying on thereon is thermally decomposed to generate ammonia, obtains reducing agent.Cigarette Gas takes away the gaseous ammonia that reducing agent precursor is thermally decomposed to generate while passing through honeycomb heat accumulation body recovery waste heat, and the two is quick Through being arranged on the denitrating catalyst at flue rear after mixing, reduction reaction occurs, removes nitrogen oxides, removal efficiency is reachable 98%.
Using electron-beam vapor deposition method, carry out directly heating evaporation reducing agent precursor under vacuum using electron beam, Reducing agent precursor is ammonium salt, is vaporized and is transported to denitration honeycomb skin, condenses to be formed also on honeycomb heat accumulation body surface Former agent precursor film.After the partial cell heat storage is heated, reducing agent precursor film thereon is thermally decomposed to generate reduction Agent ammonia.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description Point is contained at least one embodiment or example of the present utility model.In this manual, to the schematic table of above-mentioned term State and be not necessarily referring to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be Combined in an appropriate manner in any one or more embodiments or example.
While there has been shown and described that embodiment of the present utility model, it will be understood by those skilled in the art that: These embodiments can be carried out with a variety of changes, modification in the case where not departing from principle and objective of the present utility model, replaced And modification, the scope of the utility model are limited by claim and its equivalent.

Claims (4)

  1. A kind of 1. system of rotary hearth furnace flue gas accumulation of heat denitration, it is characterised in that including:
    Accumulation of heat denitrification apparatus, the accumulation of heat denitrification apparatus set gradually heat-accumulating area and accumulation of heat denitration region along flow of flue gas direction, its In, the heat-accumulating area has the air outlet slit after smoke inlet and preheating, and the smoke inlet is connected with the exhaust opening of rotary hearth furnace, Air outlet slit after the preheating is connected with the nozzle of rotary hearth furnace, also, the heat-accumulating area is provided with and carries reducing agent precursor storage Hot body;The denitration region has the first gas port, and is provided with denitration heat storage, the load reducing agent precursor heat storage and described Denitration heat storage is honeycomb ceramics shape;
    Three-way diverter valve, the three-way diverter valve have air intake, the second gas port and an exhanst gas outlet, second gas port and with First gas port of the denitration region is connected;
    Dust arrester, the dust arrester have gas access and purified gas outlet, the gas access and the cigarette Gas outlet is connected,
    Wherein,
    The denitration heat storage includes:
    Heat storage matrix, the heat storage matrix include the first inorganic powder;And
    Loading mixture, the loading mixture are supported on the heat storage matrix, and the loading mixture includes:
    Denitrating catalyst;
    First additive, first additive contain carbide slag,
    The load reducing agent precursor heat storage includes:
    Accumulation of heat honeycomb ceramics, the accumulation of heat honeycomb ceramics include the second inorganic powder and the Second addition containing carbide slag;And
    Reducing agent precursor film, the reducing agent precursor film are covered on the accumulation of heat honeycomb ceramics, wherein, before reducing agent Body is to be produced ammonia by thermal decomposition and do not produce the compound of sulfur-bearing and chlorine.
  2. 2. the system of rotary hearth furnace flue gas accumulation of heat denitration according to claim 1, it is characterised in that body before the load reducing agent Body heat storage and the denitration heat storage are cellular cuboid.
  3. 3. the system of rotary hearth furnace flue gas accumulation of heat denitration according to claim 2, it is characterised in that the cellular cuboid Size be 400mm × 400mm × 100mm, and honeycomb aperture is not less than 30mm.
  4. 4. the system of rotary hearth furnace flue gas accumulation of heat denitration according to claim 1, it is characterised in that the denitrating catalyst Carrier is titania-alumina composite oxides, and active component includes activated carbon, and Supplementary active ingredients include five oxidations two Vanadium-tungstic acid composite oxides, auxiliary agent include iron and lanthanum.
CN201621440725.3U 2016-12-26 2016-12-26 The system of rotary hearth furnace flue gas accumulation of heat denitration Active CN206660914U (en)

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Publication number Priority date Publication date Assignee Title
CN112745867A (en) * 2021-01-21 2021-05-04 华中科技大学 Heat accumulation roller pyrolysis reactor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112745867A (en) * 2021-01-21 2021-05-04 华中科技大学 Heat accumulation roller pyrolysis reactor

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