CN208493778U - Sintering device flue gas heating cooperates with denitrification apparatus with ammonia mixing and SNCR - Google Patents
Sintering device flue gas heating cooperates with denitrification apparatus with ammonia mixing and SNCR Download PDFInfo
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- CN208493778U CN208493778U CN201820951017.9U CN201820951017U CN208493778U CN 208493778 U CN208493778 U CN 208493778U CN 201820951017 U CN201820951017 U CN 201820951017U CN 208493778 U CN208493778 U CN 208493778U
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Abstract
The purpose of this utility model is to provide a kind of heating of sintering device flue gas to cooperate with denitrification apparatus with ammonia mixing and SNCR, is used for the technical issues of solving to sintering device flue gas NO_x Reduction by Effective.It includes sintering device flue gas and hot blast feeding mechanism, and sintering device flue gas and hot blast feeding mechanism include isobaric bellows, isobaric uniformly distributed air duct, ammonia-gas spraying device and hot air spout；Hot wind sequence passes through isobaric bellows and uniformly distributed air duct；Ammonia-gas spraying device sprays into the ammonium hydroxide of atomization into uniformly distributed air duct；Hot wind and ammonia after being sufficiently mixed, are entered in sintering device flue gas flue by spout, are uniformly mixed with sintering device flue gas completion.Utility model mixes the utility model has the advantages that hot wind may be implemented with the uniform of sintering flue gas, while realizing that the rapid evaporation of ammonium hydroxide cooperates with denitration with SNCR.
Description
Technical field
The utility model relates to gas denitrifying technology field, specifically sintering device flue gas heating mixes and SNCR with ammonia
Cooperate with denitrification apparatus.
Background technique
With the promulgation of " most tight environmental law in history ", country further increases environmental inspection dynamics.Deeply to implement 19
Greatly to the requirement of environmental protection, country improves the discharge index of steel works sintering machine flue gas, it is desirable that reaches nitrogen oxides comprehensively
(NOx), sulfur dioxide (SO2), particulate matter (PM) be respectively 50mg/m3、35mg/m3、10mg/m3Minimum discharge standard, it is domestic
Major steel mill introduces sintering device flue gas denitrating technique comprehensively immediately.
The source industrial smoke NOx can be divided into heating power type, fuel type, Quick-type.Heating power type refers under the conditions of high-temp combustion,
Nitrogen (N in air2) and oxygen (O2) reacting to each other generates NO；Fuel type refers in combustion process, the N in air2And fuel
In hydrocarbon group (CH) reaction generate NO predecessor, these predecessors such as HCN, CN and be oxidized into NOx again；Quick-type refers to
Nitrogen in fuel is oxidized into NOx in combustion, this part NOx is referred to as fuel type NOx.
Denitrating flue gas generally uses reduction method, and the nitrogen oxides reduction in flue gas is generated nitrogen and water using ammonia, according to
Whether with the presence of catalyst, it is divided into selective catalytic reduction reaction (SCR) and reacts two kinds of (SNCR) with selective non-catalytic reduction.
Its reaction equation is as follows:
4NO+4NH3+O2→4N2+6H2O
6NO2+8NH3→7N2+12H2O
NO+NO2+2NH3→2N2+3H2O
Whether SCR and SNCR difference are different with the presence of catalyst and reaction temperature, and there are catalyst for SCR requirement, instead
Answer temperature between 200 DEG C~350 DEG C or so；SNCR does not require catalyst, and reaction temperature is between 800 DEG C~1000 DEG C or so.
SCR denitration have structure is simple, operation is convenient, rotating machinery is few, without byproduct, denitration efficiency height, technology maturation,
The advantages that reliable and stable is the most reasonable technique for being suitable for sintering flue gas denitration at present.Since sintering flue gas temperature is lower, about
120 DEG C~150 DEG C or so, therefore not can be used directly SCR reducing process.In the prior art, it needs using after heated by gas
Hot wind is mixed into sintering device flue gas, and flue-gas temperature is heated to 220 DEG C~320 DEG C, reaches the reaction process condition of SCR.
Currently, the technique has obtained the approval of domestic sintering device flue gas denitration industry.But how to ensure heated by gas
Hot wind afterwards is quickly completed with sintering device flue gas to be mixed, and ensures that temperature is uniform when flue gas enters SCR reactor, section temperature difference is little
In 5 DEG C, still without mature effective technology.In addition, in sintering device flue gas denitrating system ammonia addition, generally using ammonium hydroxide in cigarette
Internal spraying evaporation in road need to generally install static mixing to guarantee to be uniformly mixed before sintering device flue gas enters SCR reactor after evaporation
Device.But the resistance that static mixer will cause flue gas is larger, can reduce denitration efficiency.In addition, the burning coal gas of heating flue gas
It has brought new nitrogen oxides into again, has increased the Design cooling load of SCR reactor.
Utility model content
The purpose of this utility model is to provide a kind of heating of sintering device flue gas to cooperate with denitrification apparatus with ammonia mixing and SNCR,
The technical issues of for solving to sintering device flue gas NO_x Reduction by Effective.
The technical solution adopted by the utility model to solve its technical problems is that:
Sintering device flue gas heating cooperates with denitrification apparatus, including sintering device flue gas and hot blast feeding machine with ammonia mixing and SNCR
Structure, sintering device flue gas and hot blast feeding mechanism include isobaric bellows, isobaric uniformly distributed air duct, ammonia-gas spraying device and hot air spout；
The hot-wind inlet of isobaric bellows is connected to external heating device of air, the hot-blast outlet of isobaric joint sealing and uniformly distributed air duct
Entrance connection, the ammonia atomisation outlet of ammonia-gas spraying device are connected to uniformly distributed air duct；The hot air spout is mounted on the flue of sintering machine
It is interior, the outlet of the entrance of hot air spout and uniformly distributed air duct.
Further, spout swirl vane is equipped in the hot air spout.
Further, static mixing device is installed in the flue of sintering machine.
The effect provided in utility model content is only the effect of embodiment, rather than whole effects that utility model is all
Fruit, a technical solution in above-mentioned technical proposal have the following advantages that or the utility model has the advantages that
1, the hot wind high temperature advantage formed after blast furnace gas combustion is made full use of, ammonium hydroxide may be implemented in uniformly distributed air duct
Evaporation rapidly.It overcomes in the prior art, when ammonium hydroxide evaporates in sintering machine flue, ammonia mixes uneven problem with flue gas.It takes
Disappeared the ammonium hydroxide vapo(u)rization system before SCR reactor and static mixer, reduces system drag overall.
2, the hot blast temperature bring temperature window after taking full advantage of gas-fired, the environment meet the reaction item of SNCR
Part.Ammonia is reacted with a small amount of NOx that blast furnace gas combustion is formed by SNCR, is eliminated the NOx of blast furnace gas combustion formation, is kept away
Exempt from heating flue gas and brings new nitrogen oxides into.
3, wind snout structure is mixed using dedicated spiral-flow type, realizes and realizes the equal of ammonia while hot wind is sufficiently mixed with flue gas
Even distribution provides good condition for the catalytic reduction reaction in SCR reactor.
4, integration, integrated design are, it can be achieved that batch production processing and fabricating and precision assembly, improve site operation speed
Degree.
Detailed description of the invention
Fig. 1 is the overall structure operation schematic diagram of the utility model embodiment；
Fig. 2 is the operation schematic diagram of spout in Fig. 1；
1. hot-wind inlet；2. isobaric bellows；3.-ammonia-gas spraying device；4. the uniformly distributed air duct of equipressure；5. spout；6. swirl vane.
Specific embodiment
In order to clearly illustrate the technical characterstic of this programme, below by specific embodiment, and its attached drawing is combined, to this
Utility model is described in detail.It should be noted that illustrated component is not drawn necessarily to scale in the accompanying drawings.The utility model
It is omitted to known assemblies and technical description to avoid being unnecessarily limiting the utility model.
As depicted in figs. 1 and 2, a kind of to cooperate with denitrification apparatus with ammonia mixing and SNCR using sintering device flue gas heating, including
Hot wind after coal gas (coke-stove gas, blast furnace gas etc. or its gaseous mixture) burning, through hot-wind inlet 1, sequentially into the present apparatus
In isobaric bellows 2 and isobaric uniformly distributed air duct 4.Ammonia-gas spraying device 3 is housed on the uniformly distributed air duct 4 of equipressure, ammonia-gas spraying device 3 is uniformly distributed to equipressure
The ammonium hydroxide of atomization is sprayed into air duct 4.Ammonia-gas spraying device is injected directly into ammonia, eliminate in the prior art ammonium hydroxide in sintering machine flue
Evaporation process, improve the thermal stability of hot wind.At high temperature, ammonium hydroxide is evenly distributed in air duct 4 in hot wind equipressure evaporates rapidly shape
At ammonia and vapor.Ammonia and hot wind after evenly mixing, about 800 DEG C~1100 DEG C of hot blast temperature, meet the reaction item of SNCR
Part.Therefore, the ammonia in hot wind is evenly distributed in air duct 4 in hot wind equipressure with the nitrogen oxides in hot wind (gas-fired generates) and sends out
Raw reduction reaction is raw, at nitrogen and vapor.Hot wind realizes part using the advantage in isobaric uniformly distributed air duct 4
The fast eliminating of nitrogen oxides avoids the load of nitrogen oxides increase sintering device flue gas SCR reaction unit in hot wind.Then, hot
Wind and ammonia be sufficiently mixed after hot gas, be mixed into sintering device flue gas flue by multiple spouts 5 in sintering device flue gas flue.?
During flue gas in hot wind and sintering machine is sufficiently mixed, ammonia also completes uniform mix with the flue gas in sintering machine；
It is sufficiently mixed to improve hot wind with the flue gas in sintering machine, swirl vane 6 is installed on spout 5, form jet stream
Entraining type spout.Hot wind after the cyclonic action of swirl vane 6 enters in sintering device flue gas flue, roll up by the eddy flow of forming region
Suction effect completes heat exchange in the eddy flow mixed process of hot wind and sintering device flue gas, realizes the uniform of sintering device flue gas temperature
It is promoted.
The spout 5 can also use general spout, in order to ensure that hot wind is quickly mixed with sintering device flue gas, spray in hot wind
The mountable static mixing device of sintering machine flue downstream after entering.
Except for the technical features described in the specification, it all is technically known to those skilled in the art.
It is above-mentioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but it is not practical new to this
The limitation of type protection scope, on the basis of technical solutions of the utility model, those skilled in the art do not need to pay creativeness
The various modifications or changes that can make of labour it is still within the protection scope of the present utility model.
Claims (3)
1. sintering device flue gas heating cooperates with denitrification apparatus with ammonia mixing and SNCR, characterized in that including sintering device flue gas and hot wind
Organization of supply, sintering device flue gas and hot blast feeding mechanism include isobaric bellows, isobaric uniformly distributed air duct, ammonia-gas spraying device and hot wind spray
Mouthful；
The hot-wind inlet of isobaric bellows is connected to external heating device of air, the entrance of the hot-blast outlet of isobaric joint sealing and uniformly distributed air duct
Connection, the ammonia atomisation outlet of ammonia-gas spraying device are connected to uniformly distributed air duct；The hot air spout is mounted on the flue of the sintering machine
It is interior, the outlet of the entrance of hot air spout and uniformly distributed air duct.
2. sintering device flue gas heating according to claim 1 cooperates with denitrification apparatus with ammonia mixing and SNCR, characterized in that institute
It states and is equipped with spout swirl vane in hot air spout.
3. sintering device flue gas heating according to claim 1 cooperates with denitrification apparatus with ammonia mixing and SNCR, characterized in that institute
It states and static mixing device is installed in sintering machine flue.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820951017.9U CN208493778U (en) | 2018-06-20 | 2018-06-20 | Sintering device flue gas heating cooperates with denitrification apparatus with ammonia mixing and SNCR |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820951017.9U CN208493778U (en) | 2018-06-20 | 2018-06-20 | Sintering device flue gas heating cooperates with denitrification apparatus with ammonia mixing and SNCR |
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| CN208493778U true CN208493778U (en) | 2019-02-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108579375A (en) * | 2018-06-20 | 2018-09-28 | 山东国舜建设集团有限公司 | Sintering device flue gas is heated cooperates with denitrification apparatus and method of denitration with ammonia mixing and SNCR |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108579375A (en) * | 2018-06-20 | 2018-09-28 | 山东国舜建设集团有限公司 | Sintering device flue gas is heated cooperates with denitrification apparatus and method of denitration with ammonia mixing and SNCR |
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