CN205995275U - A kind of middle low-temperature denitration of flue gas device - Google Patents
A kind of middle low-temperature denitration of flue gas device Download PDFInfo
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- CN205995275U CN205995275U CN201620847901.9U CN201620847901U CN205995275U CN 205995275 U CN205995275 U CN 205995275U CN 201620847901 U CN201620847901 U CN 201620847901U CN 205995275 U CN205995275 U CN 205995275U
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Abstract
A kind of middle low-temperature denitration of flue gas device, including flue gas heater (2), ammonia-spraying grid device (3), SCR reactor (4), current equalizer (5), soot blower (6), catalyst layer (7) and energy-recuperation system (8)；Described flue gas heater is arranged on SCR reactor front end inlet flue, and flue gas heater is arranged in parallel by bypass duct, the cut-out of flue gas heater bypass duct, pending middle low-temperature flue gas enter ammonia-spraying grid device from gas approach by direct pipeline and SCR reactor realizes denitration reaction under normal circumstances；The front end of CR reactor is provided with current equalizer, catalyst layer, and the deashing of catalyst layer is realized on the top that soot blower is arranged in every layer of catalyst layer；Energy-recuperation system is arranged in SCR reactor outlet.By the interval of flue gas heater using the denitration of low-temperature flue gas in realizing, reducing energy consumption can save operating cost simultaneously.
Description
Technical field
This utility model is related to a kind of middle low-temperature denitration of flue gas device, is particularly useful for the row such as glass, cement, coking, iron and steel
The denitration of the middle low temperature exhaust gas of industry.
Background technology
Increasingly raising with China's economy and living standard, it will environment is given with increasing concern.Due to NOx
The environmental problems such as greenhouse effect, depletion of the ozone layer and photochemical fog can be caused, therefore People's Republic of China's national economy and society
Can develop in the 12nd five-year-plan outline to reduce discharging nitrogen oxides and list the binding indicator in.National environmental protection portion《2009-
National prevention and cure of pollution key work in 2010》Notice ninth item in explicitly point out, " before the end of the year in 2015, active service unit will be whole
Complete denitration transformation ".National environmental protection portion《Fossil-fuel power plant atmospheric pollutant emission standard》(GB13223-2011) regulation in, 2004
The 100mg/Nm of newly constructed boiler discharged nitrous oxides standard execution later3Regulation.NO at presentxTreatment technology be divided into burning before control
Control technology and burning post-control technology in technology processed, burning, before burning, control technology research is less；In burning, control technology is
By low-NO_x combustion technology and its low NO (LNB) produced by being applied；It is non-that burning post-control technology is mainly selectivity
Catalysis reduction (SNCR) and SCR (SCR).
SCR denitration technology, due to its high denitration efficiency, becomes a kind of most commonly used denitration technology of domestic and international application, so far
Till the present, the installation total amount of the installation in the whole world is more than 90%.The reaction mechanism of SCR is in the presence of catalyst layer, to reaction
Reducing agent is sprayed into, itself and NO at a temperature of 300-420 DEG C in devicexSelective catalysis reaction is occurred to generate N2And H2O is thus reach
The purpose of denitration.As temperature is less than the depositing temperature (less than 300 DEG C) of ammonium sulfate, the Ammonium hydrogen sulfate of generation can be catalyzed
Oxidant layer surface sediment causes the blocking of catalyst layer to be poisoned, and so that denitration reaction cannot be normally carried out.In catalyst layer Ammonium hydrogen sulfate
Poison is that one kind is reversible to be poisoned, and when flue-gas temperature raises, (more than 300 DEG C) Ammonium hydrogen sulfate can decompose, and makes catalyst layer recover normal
Use.
Because power plant's denitration transformation is basically completed, steel plant, cement plant, glass furnace, the NOx of coke-oven plant are due to concentration of emission
Higher, it has also become the emphasis of country's concern, but due to several industries above flue gas after waste heat boiler temperature be in
180-250 DEG C, it is impossible to carry out normal SCR denitration reaction, can be heated by flue gas again and elevate the temperature to normal temperature window
300-420 DEG C of mouth, but energy consumption is greatly, and operation cost is high.Steel works sintering machine flue gas, coke-oven plant's tail gas denitration are substantially empty
In vain；Cement kiln also carrys out rough and careless control NOx simply by SNCR；Glass furnace flue gas carries out denitration before waste heat boiler, but due to
Glass furnace flue gas contains a large amount of alkali metal, and high-temperature dust removal is unstable simultaneously, causes catalyst layer to be easily poisoned it is impossible to stable transport
OK；And study more low-temperature catalyzed oxidant layer at present and never have progress, thus develop suitable denitration technology and compel in eyebrow
Eyelash.
Content of the invention
Goal of the invention of the present utility model is：In order to solve current steel plant, cement plant, glass furnace, coke-oven plant NOx improvement
Technical bottleneck, a kind of middle low-temperature denitration of flue gas device that can run steadily in the long term is proposed, energy consumption heats technique again compared with flue gas
Substantially reduce.
The technical solution of the utility model：Middle low-temperature denitration of flue gas device, is characterized in that including flue gas heater 2, spray ammonia
Grid device 3, SCR reactor 4, current equalizer 5, soot blower 6, catalyst layer 7 and energy-recuperation system 8；Described flue gas heater 2
It is arranged on SCR reactor 4 front end inlet flue 1, and flue gas heater is arranged in parallel by bypass duct, cigarette under normal circumstances
The cut-out of hot-air heater bypass duct, pending middle low-temperature flue gas are passed through direct pipeline from gas approach and are entered ammonia-spraying grid device 3
Realize denitration reaction with SCR reactor 4；The front end of CR reactor is provided with current equalizer 5, catalyst layer 7, and current equalizer 5 is arranged in SCR
The front end of reactor 4 ensures that flue gas is evenly distributed before catalyst layer 7；Soot blower 6 is arranged in the top of every layer of catalyst layer 7
Realize the deashing of catalyst layer；Energy-recuperation system 8 is arranged in SCR reactor outlet, to realize the middle low temperature after denitration process
The waste heat recovery of flue gas, and finally flow into upstream device through exhaust pass 9.
The cut-out of flue gas heater bypass duct, pending middle low-temperature flue gas pass through directly to manage from gas approach under normal circumstances
Road enters ammonia-spraying grid device 3 and SCR reactor 4 realizes denitration reaction；When catalyst layer ammonium salt and poisons, close
Directly pipeline, and open bypass duct and so that pending middle low-temperature flue gas stream is heated up through flue gas heater from gas approach, enter back into
Ammonia-spraying grid device 3 and SCR reactor 4 realize denitration reaction；
Further, the front end of SCR reactor is provided with current equalizer 5, catalyst layer 7, and the notch setting of soot blower 6 is urged in be aligned
Agent layer.
Current equalizer 5 is arranged in the top of SCR reactor 4 thus ensureing that flue gas is evenly distributed before catalyst layer 7；Soot blowing
Device 6 is arranged in the top of every layer of catalyst layer 7 deashing to realize catalyst layer；Energy-recuperation system 8 is arranged in SCR reactor
Outlet, to realize the waste heat recovery of the middle low-temperature flue gas after denitration process, and finally flows into upstream device through exhaust pass 9.All
Stream device can adopt corrugated board structures.
The temperature range of described middle low-temperature flue gas is 180-300 DEG C；
Suitable temperature after low-temperature flue gas in described flue gas heater heating is 300-420 DEG C；
Described flue gas heater is electric heater and steam heater etc.；
Described soot blower is steam sootblower, acoustic wave ash ejector, shock wave soot blower etc.；
The active component of described catalyst layer be V2O5, arrangement the number of plies can arrange as needed 1 layer, two-layer, three layers very
Extremely more；
Described energy-recuperation system is waste heat boiler, heat exchanger etc..
This utility model beneficial effect：Design of the present utility model is by the interval of flue gas heater using low temperature in realizing
The denitration of flue gas, and ensure to run steadily in the long term, reducing energy consumption can save operating cost, thus solving current iron and steel simultaneously
Factory, cement plant, glass furnace, low-temperature flue gas NOx administers in coke-oven plant technical bottleneck.
Above-described embodiment is only to illustration of the present utility model, but technical characteristic of the present utility model is not limited to
This, any change that any those skilled in the art makes in field of the present utility model and modify all cover in this practicality
Within new scope of patent protection.
Brief description
Fig. 1 is process schematic representation of the present utility model.
Specific embodiment
With reference to the accompanying drawings and examples this utility model is further illustrated.
Taking steel industry sintering device flue gas denitration as a example explain, Fig. 1 is the structural representation of this new technology device, such as scheme
Shown, this system mainly includes flue gas heater 2, ammonia-spraying grid device 3, SCR reactor 4, current equalizer 5, soot blower 6, catalysis
Oxidant layer 7 and energy-recuperation system 8.Under normal condition, the sintering device flue gas of middle-temperature section (180-250 DEG C) are directly bypassed to
The ammonia that gas approach 1 is sprayed into ammonia-spraying grid device 3 mixes, and subsequently flows into SCR reactor 4 and realize denitration reaction；One section
After time when Ammonium hydrogen sulfate blocking poisoning in catalyst layer 7 surface, switch flue gas flow direction, make flue gas enter SCR reaction
First pass through flue gas heater 2 before device 4 and be heated to suitable temperature (300-420 DEG C), thus realizing catalysis while continuous denitration
The regeneration of oxidant layer 7；SCR reactor 4 entrance arrangement current equalizer 5 is thus ensure flue gas mix homogeneously when through catalyst layer 7；
Every layer of catalyst layer 7 top arranges appropriate number of soot blower 6 thus ensureing catalyst layer 7 not dust stratification；SCR reactor 4 exports
, thus realizing the waste heat recovery of flue gas, the flue gas reclaiming heat is eventually through under exhaust pass 9 inflow for arrangement energy-recuperation system 8
Trip equipment.Using the reversible principle of Ammonium hydrogen sulfate poisoning, used by the interval of flue gas heater 2 and realize low temperature in sintering machine
The denitration of flue gas, and ensure to run steadily in the long term；Energy consumption heats technique again compared with flue gas and substantially reduces.
It should be pointed out that for those skilled in the art, before without departing from this utility model principle
Put, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection domain of the present utility model.This reality
Apply all available prior art of clearly not each ingredient in example to be realized.
Claims (5)
1. low-temperature denitration of flue gas device in, is characterized in that, including flue gas heater (2), ammonia-spraying grid device (3), SCR reactor
(4), current equalizer (5), soot blower (6), catalyst layer (7) and energy-recuperation system (8)；Described flue gas heater (2) is arranged in
On SCR reactor (4) front end inlet flue (1), and flue gas heater is arranged in parallel by bypass duct, flue gas under normal circumstances
Heater by-pass pipe cutting, pending middle low-temperature flue gas pass through direct pipeline from gas approach and enter ammonia-spraying grid device (3)
Realize denitration reaction with SCR reactor (4)；The front end of CR reactor is provided with current equalizer (5), catalyst layer, and current equalizer is arranged in
The front end of SCR reactor ensures that flue gas is evenly distributed before catalyst layer (7)；Soot blower (6) is arranged in every layer of catalyst layer 7
Top realize the deashing of catalyst layer；Energy-recuperation system (8) is arranged in SCR reactor outlet, to realize after denitration process
Middle low-temperature flue gas waste heat recovery, and final flow into upstream device through exhaust pass (9).
2. middle low-temperature denitration of flue gas device according to claim 1, is characterized in that, described flue gas heater is electrical heating
Device or steam heater.
3. middle low-temperature denitration of flue gas device according to claim 1, is characterized in that, described soot blower is steam soot blowing
Device, acoustic wave ash ejector or shock wave soot blower.
4. middle low-temperature denitration of flue gas device according to claim 1, is characterized in that, 1 layer to 5 layers of described catalyst layer.
5. middle low-temperature denitration of flue gas device according to claim 1, is characterized in that, described energy-recuperation system is waste heat
Boiler or heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620847901.9U CN205995275U (en) | 2016-08-05 | 2016-08-05 | A kind of middle low-temperature denitration of flue gas device |
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| CN201620847901.9U CN205995275U (en) | 2016-08-05 | 2016-08-05 | A kind of middle low-temperature denitration of flue gas device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110585923A (en) * | 2019-09-11 | 2019-12-20 | 上海发电设备成套设计研究院有限责任公司 | Diesel engine tail gas afterburning flue gas denitration system and method |
| CN111151130A (en) * | 2020-02-27 | 2020-05-15 | 东方电气集团东方锅炉股份有限公司 | SCR (selective catalytic reduction) flue gas denitration system with online regeneration function for garbage incinerator and denitration method thereof |
| CN112403220A (en) * | 2019-11-06 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Heat exchange type flue gas denitration and decarburization treatment system and method |
-
2016
- 2016-08-05 CN CN201620847901.9U patent/CN205995275U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110585923A (en) * | 2019-09-11 | 2019-12-20 | 上海发电设备成套设计研究院有限责任公司 | Diesel engine tail gas afterburning flue gas denitration system and method |
| CN112403220A (en) * | 2019-11-06 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Heat exchange type flue gas denitration and decarburization treatment system and method |
| CN112403220B (en) * | 2019-11-06 | 2022-12-06 | 中冶长天国际工程有限责任公司 | Heat exchange type flue gas denitration and decarburization treatment system and method |
| CN111151130A (en) * | 2020-02-27 | 2020-05-15 | 东方电气集团东方锅炉股份有限公司 | SCR (selective catalytic reduction) flue gas denitration system with online regeneration function for garbage incinerator and denitration method thereof |
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