CN209490673U - A kind of sintering device flue gas denitrating system - Google Patents
A kind of sintering device flue gas denitrating system Download PDFInfo
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- CN209490673U CN209490673U CN201822040733.4U CN201822040733U CN209490673U CN 209490673 U CN209490673 U CN 209490673U CN 201822040733 U CN201822040733 U CN 201822040733U CN 209490673 U CN209490673 U CN 209490673U
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- flue gas
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Abstract
The utility model discloses a kind of sintering device flue gas denitrating systems, including dust-extraction unit, empty ammonia mixing arrangement, ammonia injection apparatus, Smoke-heating device, SCR reaction unit, heat-exchanger rig, smoke exhaust fan；Dust-extraction unit is connect by the first flue with smoke exhaust fan, and between dust-extraction unit and smoke exhaust fan, and the first flue is equipped with two by-pass flues with the cold side inlet of heat-exchanger rig and hot end outlet connection respectively；The cold side outlet of heat-exchanger rig is connect by the second flue with the air inlet of SCR reaction unit；The gas outlet of SCR reaction unit is connected by the hot side inlet of third flue and heat-exchanger rig；Smoke-heating device and empty ammonia mixing arrangement pass through pipeline respectively and connect with the second flue.It, can be at relatively low temperature to the NO in sintering machine discharge flue gas by sintering device flue gas denitrating system designed by the utility modelxCarry out effective denitration process.
Description
Technical field
The utility model relates to a kind of sintering device flue gas denitrating systems, belong to gas denitrifying technology field.
Background technique
NOx discharge in sintering device flue gas in national industrial waste gas row's accounting 10% or so, the chemical cigarette that it is generated
Mist play the role of to the formation of haze it is direct, therefore sintering device flue gas denitration become iron and steel enterprise after control flue dust,
Another new environment protection treating unit after the noxious emissions such as SO2.Due to the intrinsic characteristic of sintering device flue gas, it is different from fire
Electric boiler, the exhaust gas volumn that it is generated is big, fluctuation is big, temperature is low, is difficult to be moved directly to applied to the SCR technology of apparatus of thermo-electric power boiler at present
Sintering device flue gas denitrating system.The difficult point that sintering device flue gas denitration is faced is as follows: 1) being urged using temperature in 200 DEG C or less low temperature
There are no the cases of comercial operation for agent；2) the technology path initial stage of flue gas heating is put into and is exceeded very much with operating cost
Greatly, and new energy consumption can be generated, be not inconsistent with the original intention of energy-saving and emission-reduction；3) it is de- to can be realized integration for active carbon adsorption
Sulphur, denitration purpose, it is identical with flue gas heating, there is also investment with the excessively high problem of operating cost.By 1,000,000 Nm3/ h is burnt
The calculating of knot machine exhaust gas volumn, investment cost about 1 hundred million (just filling containing active carbon), ton mine operating cost is 30 yuan/T, operating cost mistake
It is high.Therefore, designing the high sintering machine denitration technology of a kind of small investment, denitration efficiency is current technical problem urgently to be solved.
Utility model content
To solve the above problems, the utility model provides a kind of novel sintering device flue gas denitrating system, it can be effectively right
Sintering machine discharges the NO in flue gasxDenitration process is carried out, denitration efficiency is improved.
The utility model discloses a kind of sintering device flue gas denitrating system, including dust-extraction unit, empty ammonia mixing arrangement, ammonia injection
Device, Smoke-heating device, SCR reaction unit, heat-exchanger rig and smoke exhaust fan；The dust-extraction unit passes through the first flue and row
The connection of cigarette blower, and between dust-extraction unit and smoke exhaust fan, first flue be equipped with respectively with the cold end of heat-exchanger rig into
Two by-pass flues of mouth and hot end outlet connection, the by-pass flue are equipped with closing device, are located on first flue
Closing device also is provided between by-pass flue；The cold side outlet of the heat-exchanger rig is reacted by the second flue with the SCR
The air inlet of device connects；The gas outlet of the SCR reaction unit passes through the hot side inlet of third flue and the heat-exchanger rig
Connection；There is the first aperture, the second aperture and third aperture, the air inlet of the Smoke-heating device is logical on second flue
Piping and air-introduced machine are connect with the first aperture, and the gas outlet of the Smoke-heating device is connect by pipeline with the second aperture,
The sky ammonia mixing arrangement is connect by pipeline with ammonia injection apparatus with third aperture.
As a preferred embodiment, the SCR reaction unit includes smoke inlet, exhanst gas outlet, flue gas flow guiding device, cigarette
Gas fairing, denitration catalyst bed；Wherein: the smoke inlet is arranged in the top of SCR reaction unit；The exhanst gas outlet
It is arranged in the bottom of SCR reaction unit；The flue gas flow guiding device is arranged at the smoke inlet, for anti-to SCR is entered
The velocity flow profile of the flue gas of device is answered to optimize；The flue gas fairing is located in flue gas flow guiding device and denitration catalyst bed
Between layer, for the reducing agent in the nitrogen oxides and SCR reaction unit in flue gas to be sufficiently mixed.
As a preferred embodiment, the SCR reaction unit further includes being arranged in denitration catalyst bed upper and lower part
Pressure test device, for detecting the pressure difference at denitration catalyst bed both ends.
As a preferred embodiment, the denitration catalyst bed includes three groups arranged from top to bottom.
As a preferred embodiment, the catalyst in the denitration catalyst bed is to be sintered dedicated catalytic component based on vanadium.
As a preferred embodiment, the heat-exchanger rig is rotary type heat exchanger.
As a preferred embodiment, ammonia injection apparatus is ammonia-spraying grid, and the ammonia-spraying grid has multiple of different sizes
Hole.
As a preferred embodiment, first aperture and the second aperture are located at the upstream of third aperture.
As a preferred embodiment, second aperture is multiple with being arranged circumferentially, after being heated with realization
Flue gas Reactor inlet flue is entered using multipoint mode hybrid mode.
As a preferred embodiment, the sintering device flue gas denitrating system further includes the cigarette connecting with the smoke exhaust fan
Chimney.
The utility model has the advantages that
1) the utility model can be effectively to the NO in sintering machine discharge flue gasxDenitration process is carried out, denitration efficiency is high, finally
The NO being discharged into atmospherexContent meets national relevant emission standards now.
2) application based on heat exchange and heat patching device, the flue gas heating procedure to be exchanged heat using concurrent heating are utilized to greatest extent
Flue-gas temperature gradient reduces energy consumption, and ensure that the flue-gas temperature into SCR reactor can meet needed for SCR reactor
Temperature condition, being normally carried out for denitration reaction is ensured that using common denitrating catalyst, and denitration reaction speed is fast, take off
Nitre is at low cost.
3) in SCR reactor, pass through catalyst in the design and denitration catalyst bed of flue gas water conservancy diversion and rectifier structure
Effect so that flue gas can carry out denitration reaction at a lower temperature, and denitration efficiency is not less than 95%.
4) exhaust gas temperature can be controlled, exhaust gas temperature is greater than flue gas dew point, white plume is visible by naked eyes, without setting
It sets and takes off white system, reduce the cost of investment and operating cost of system.
Detailed description of the invention
Fig. 1 is sintering device flue gas denitrating system structural schematic diagram as described in the examples；
Fig. 2 is the structural schematic diagram of SCR reactor 7 as described in the examples；
Attached drawing mark: deduster 1, empty ammonia mixer 2, flue gas heater 3, house outlet flue 4, ammonia-spraying grid 5, anti-
Answer device inlet flue duct 6, SCR reactor 7, smoke inlet 71, exhanst gas outlet 72, flue gas flow guiding device 73, flue gas fairing 74,
It is denitration catalyst bed 75, pressure test device 76, reactor shell 77, support device 78, reactor outlet flue 8, rotary
Heat exchanger 9, cold side inlet 91, cold side outlet 92, hot side inlet 93, hot end export 94, baffle door 101, baffle door 102, baffle
Door 103, air-introduced machine 11, chimney 12, blower 13.
Specific embodiment
Referring to figs. 1 and 2, a kind of sintering device flue gas denitrating system (the referred to as system), master are disclosed in embodiment
It to include deduster 1, empty ammonia mixer 2, flue gas heater 3, SCR reactor 7, rotary type heat exchanger 9 and chimney 12.
SCR reactor 7 mainly includes smoke inlet 71, exhanst gas outlet 72, flue gas flow guiding device 73, flue gas fairing
74, denitration catalyst bed 75, pressure test device 76, reactor shell 77, support device 78.Wherein, flue gas flow guiding device 71
It is arranged at the smoke inlet 71 at 7 top of SCR reactor, for the flow velocity to the flue gas flowed into autoreactor inlet flue duct 6
Distribution is optimized, guarantees that the flue gas flow rate deviation for entering denitration catalyst bed 75 controls within 15%, as shown in connection with fig. 2,
The arcuate structure deflector and at least one set of arrangement that flue gas flow guiding device 71 is disposed adjacent to Reactor inlet flue 6 by one group
In arcuate structure deflector downstream, vertically disposed slab construction is constituted, and specific structure is set using conventional flue water conservancy diversion
Meter, the monolithic deflector that each group of deflector is arranged in parallel by muti-piece are constituted, and details are not described herein again.Flue gas fairing
72 are arranged in 7 top of SCR reactor, i.e. 71 downstream of flue gas flow guiding device, can by flue gas nitrogen oxides and reducing agent into one
Step mixing makes the i.e. ammonia nitrogen mole deviation ratio control of nitrogen oxides and reducing agent mix deviations within 5%, flue gas fairing 72
Conventional flue flow straightening grid structure can be used.Three are arranged from top to bottom inside SCR reactor 7 on denitration catalyst bed 75
Group, for reducing denitration reaction required temperature.Pressure test device 76 is used to detect the pressure difference at both ends in denitration catalyst bed 75,
The service condition of real-time monitoring catalyst, such as, if there is Severe blockage.In embodiment, catalyst in denitration catalyst bed 75
For cavernous structure, will appear blockage in use, according to the size of SCR reactor 7, on 7 top of SCR reactor and
Lower part is laid with a pressure detection sensor respectively, by analyzing for the pressure difference to catalyst both ends, can urge denitration
The service condition of agent judges, and needs to carry out catalyst purging or in time replacement when differential pressure is excessive.Support device 78 makes
It is supported with steel structure beam, is used to support entire reactor.SCR reactor 7 is mainly made of steel plate and fashioned iron, wherein reaction
Device shell 77 and inlet and outlet flue are all made of Q345 steel material.In the present embodiment, SCR reactor 7 can be designed to the box knot of plate
Structure, being aided with various reinforcing ribs and supporting member can satisfy shockproof, carrying catalyst, sealing, bears other loads and resist heat
The requirement of stress, and guarantee heat-insulated with the external world.
Flue gas enters through 7 top smoke inlet 71 of SCR reactor, carries out through flow velocity of the flue gas flow guiding device 71 to flue gas steady
Fixed and optimization guarantees that flue gas more steadily enters in SCR reactor 7, and then, flue gas makes it through the effect of flue gas fairing 74
In nitrogen oxides and reducing agent be sufficiently mixed, then the effect through denitration catalyst bed 75 carries out denitration at a lower temperature
Reaction, is most discharged through exhanst gas outlet 72 afterwards.Designed by this structure of SCR reactor 7, flue gas after water conservancy diversion and rectification,
Nitrogen oxides therein is uniformly distributed with reducing agent, can reach following standard when entering catalyst:
Velocity deviation < ± 15% (root-mean-square-deviation rate)；
< ± 10 ° of flow direction；
Temperature deviation < ± 10 DEG C；
NH3/NOx molar ratio absolute deviation < 5%；
As it can be seen that by 7 water conservancy diversion of SCR reactor and the design of the structure of rectification, so that the dependent deviation of inlet flue gas is subtracted
It is small, correspondingly, reaction efficiency also increases.
Common denitrating catalyst known in the art can be used in denitrating catalyst used in denitration catalyst bed 75, implements
Using dedicated catalytic component based on vanadium is sintered in example, be conducive to the progress of denitrating flue gas reaction by the use of catalyst, it can be at 220 DEG C
Under conditions of (reaction temperature ratio using conventional catalyst lower) complete denitration reaction.Experiments verify that using this structure
The denitration efficiency of SCR reactor 7 is not less than 95%.
Rotary type heat exchanger 9 is used as heat-exchanger rig, and heat exchange efficiency is high, can be used after denitration high-temperature flue gas to raw flue gas into
Row heating comprising cold and hot two channels, there are four flue gas connectors, respectively cold side inlet 91, cold side outlet 92, hot end altogether
Import 93, hot end outlet 94.Former flue gas enters heat exchanger by cold side inlet 91, is added by cold side outlet 92 with flue gas after heat exchange
Enter SCR reactor 7 after the hot-air mixing that hot device 3 is sent, flue gas enters back after completing denitration reaction in SCR reactor 7
The hot side inlet 93 of rotatable heat exchanger 9 passes through 94 discharge of hot end outlet after heat exchange.
Baffle door 101, baffle door 102 and baffle door 103 constitute baffle door group, wherein baffle door 101 is arranged in deduster
In exhaust pass 4, baffle door 102 is arranged in Reactor inlet flue 6 and is located at 101 front end of baffle door, 103 cloth of baffle door
It sets in reactor outlet flue 8 and is located at 101 rear end of baffle door.When specifically used, it can be opened and closed by the difference of working condition requirement
Different baffle doors.
Flue gas heater 3 is used as heat patching device, is fuel, the reactor introduced to air-introduced machine 13 usually using blast furnace gas
Partial fume in inlet flue duct 6 is heated, and is then sent into Reactor inlet flue 6 by pipeline again.As a kind of preferential
Scheme, the flue gas after being heated multipoint mode can be used to be mixed into Reactor inlet flue 6, uniformly heat to flue gas.
Preferred embodiment of the ammonia-spraying grid 5 as ammonia injection apparatus can simulate flue gas flow field by CFD, in spray ammonia
Different location opens up multiple holes of different sizes on grid 5, guarantees that ammonia is mixed with the uniform of flue gas.
Based on sintering device flue gas denitrating system as described in the examples, workflow is as follows:
Sintering device flue gas is by deduster 1 except, into house outlet flue 4, baffle door 101 is opened, part cigarette after dust
Gas exchanges heat through 9 cold side inlet 91 of rotary type heat exchanger into rotary type heat exchanger 9, and the flue-gas temperature after exchanging heat rises to
260~280 DEG C, Reactor inlet flue 6 is then entered by the cold side outlet 92 of rotary type heat exchanger 9, passes through air-introduced machine 13
Part of smoke in abstraction reaction device inlet flue duct 6 enters heater 3 and is heated, and then again leads to the flue gas after being heated
Enter Reactor inlet flue 6, the flue-gas temperature in Reactor inlet flue 6 rises 300~320 DEG C at this time.Meanwhile it being mixed in empty ammonia
In device 2, ammonia is mixed with air, air containing ammonia after mixing by ammonia-spraying grid 5 enter Reactor inlet flue 6 and with
Flue gas mixing.Flue gas after mixing enters SCR reactor 7 from top, and flue gas carries out denitration reaction in SCR reactor 7.
Flue gas after NOx removal enters reactor outlet flue 8, and flue-gas temperature is 295~315 DEG C at this time, and exiting flue gas passes through
The hot side inlet 93 of rotary type heat exchanger 9 enters rotary type heat exchanger 9, and is returned with the flue gas of 9 cold end of rotary type heat exchanger
Then rotatable heat exchange, the flue gas smoke temperature finished that exchanges heat pass through 94 discharge of hot end outlet of rotary type heat exchanger 9 at 70~80 DEG C.
At this point, baffle door 103 is opened, flue gas enters house outlet flue 4, enters chimney 12 finally by the draft of air-introduced machine 11 and reach
Mark discharge.
The above is the preferred embodiment of the utility model and its technical principle used, for the technology of this field
It is any to be based on technical solutions of the utility model base without departing substantially from the spirit and scope of the utility model for personnel
Equivalent transformation, simple replacement on plinth etc. obviously change, and belong within scope of protection of the utility model.
Claims (10)
1. a kind of sintering device flue gas denitrating system, which is characterized in that including dust-extraction unit, empty ammonia mixing arrangement, ammonia injection apparatus,
Smoke-heating device, SCR reaction unit, heat-exchanger rig and smoke exhaust fan；The dust-extraction unit passes through the first flue and Smoke
Machine connection, and between dust-extraction unit and smoke exhaust fan, first flue be equipped with respectively with the cold side inlet of heat-exchanger rig and
Two by-pass flues of hot end outlet connection, the by-pass flue are equipped with closing device, are located at branch on first flue
Closing device also is provided between flue；The cold side outlet of the heat-exchanger rig passes through the second flue and the SCR reaction unit
Air inlet connection；The gas outlet of the SCR reaction unit is connect by third flue with the hot side inlet of the heat-exchanger rig；
There is the first aperture, the second aperture and third aperture, the air inlet of the Smoke-heating device passes through pipe on second flue
Road and air-introduced machine are connect with the first aperture, and the gas outlet of the Smoke-heating device is connect by pipeline with the second aperture, described
Empty ammonia mixing arrangement is connect by pipeline with ammonia injection apparatus with third aperture.
2. sintering device flue gas denitrating system as described in claim 1, which is characterized in that the SCR reaction unit includes flue gas
Entrance, exhanst gas outlet, flue gas flow guiding device, flue gas fairing, denitration catalyst bed；Wherein: the smoke inlet is arranged in
The top of SCR reaction unit；The exhanst gas outlet is arranged in the bottom of SCR reaction unit；The flue gas flow guiding device is arranged in
At the smoke inlet, optimized for the velocity flow profile to the flue gas for entering SCR reaction unit；The flue gas fairing
Positioned between flue gas flow guiding device and denitration catalyst bed, for will be in the nitrogen oxides and SCR reaction unit in flue gas
Reducing agent is sufficiently mixed.
3. sintering device flue gas denitrating system as claimed in claim 2, which is characterized in that further include being arranged in denitration catalyst bed
The pressure test device of upper and lower part, for detecting the pressure difference at denitration catalyst bed both ends.
4. sintering device flue gas denitrating system as claimed in claim 2, which is characterized in that the flue gas flow guiding device is by along flue gas
At least two groups deflector structure for flowing to direction arrangement is constituted, and the flue gas fairing uses flow straightening grid structure.
5. sintering device flue gas denitrating system as claimed in claim 2, which is characterized in that the catalysis in the denitration catalyst bed
Agent is to be sintered dedicated catalytic component based on vanadium.
6. the sintering device flue gas denitrating system as described in claim 1 to 5 any one, which is characterized in that the heat-exchanger rig
For rotary type heat exchanger.
7. the sintering device flue gas denitrating system as described in claim 1 to 5 any one, which is characterized in that ammonia injection apparatus is
Ammonia-spraying grid, the ammonia-spraying grid have multiple holes of different sizes.
8. the sintering device flue gas denitrating system as described in claim 1 to 5 any one, which is characterized in that first aperture
It is located at the upstream of third aperture with the second aperture.
9. the sintering device flue gas denitrating system as described in claim 1 to 5 any one, which is characterized in that second aperture
It is multiple with what is be arranged circumferentially.
10. the sintering device flue gas denitrating system as described in claim 1 to 5 any one, which is characterized in that further include with it is described
The chimney of smoke exhaust fan connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822040733.4U CN209490673U (en) | 2018-12-06 | 2018-12-06 | A kind of sintering device flue gas denitrating system |
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| CN201822040733.4U CN209490673U (en) | 2018-12-06 | 2018-12-06 | A kind of sintering device flue gas denitrating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112843978A (en) * | 2020-12-28 | 2021-05-28 | 上海域德环保工程有限公司 | Two-way sealed intensification denitrification facility of flue is burnt to danger useless |
| CN114887477A (en) * | 2022-05-17 | 2022-08-12 | 广东国鑫实业股份有限公司 | Denitration system of sintering machine |
-
2018
- 2018-12-06 CN CN201822040733.4U patent/CN209490673U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112843978A (en) * | 2020-12-28 | 2021-05-28 | 上海域德环保工程有限公司 | Two-way sealed intensification denitrification facility of flue is burnt to danger useless |
| CN114887477A (en) * | 2022-05-17 | 2022-08-12 | 广东国鑫实业股份有限公司 | Denitration system of sintering machine |
| CN114887477B (en) * | 2022-05-17 | 2023-08-22 | 广东国鑫实业股份有限公司 | Sintering machine denitration system |
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