CN105727745A - Microwave reaction system device for SCR denitration - Google Patents
Microwave reaction system device for SCR denitration Download PDFInfo
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- CN105727745A CN105727745A CN201610189005.2A CN201610189005A CN105727745A CN 105727745 A CN105727745 A CN 105727745A CN 201610189005 A CN201610189005 A CN 201610189005A CN 105727745 A CN105727745 A CN 105727745A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
- B01J19/122—Incoherent waves
- B01J19/126—Microwaves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention relates to a microwave reaction system device for SCR denitration and belongs to the technical field of flue gas denitration equipment. The microwave reaction system device comprises a reactor main body, a uniform gas distributor (1), a device heat preservation layer (2), a microwave generating device (3), a temperature measuring unit (4), a catalyst module (5) and an ammonia spraying system (6), wherein the temperature of the catalyst can be adjusted by adjusting the input power of the microwave generator. The reaction system device disclosed by the invention has the advantages of wide application scope, energy conservation, environment protection, simple operation, excellent economic efficiency and potential industrial application value.
Description
Technical field
The present invention relates to the microwave reaction system and device of a kind of SCR (selective catalytic reduction) denitration, belong to flue gas denitrification equipment technical field.
Background technology
Along with industrialized fast development, people's living standard etc. is significantly improved, and residing living environment be there has also been higher requirement.Since 2013, there is serious haze weather in big portion of China, and its formation is mostly derived from PM2.5 and NO in airx, the serious weather that pollutes affects orthobiosis and the work of people, causes showing great attention to of government and various circles of society.Nitrogen oxides NOxBeing one of Air Pollutants, it is essentially from industrial discharges etc. such as vehicular emission and electric power, iron and steel, metallurgy, chemical industry and building materials.Therefore the emission control of NOx is a current important and large order.In order to control, reduce the discharge of NOx, country has put into effect increasingly strict Air Pollution Control standard and regulation successively, and clearly proposes the planning controlling discharged nitrous oxides and requirement.SCR (SCR) technology is NOx emission control technology the most frequently used and the most ripe at present, utilizes HC, NH3, the reducing agent such as CO, under the effect of catalyst, it is possible to effective by NOXTransfer innoxious N to2, reach the purpose of pollutant emission decrement.
While it is true, SCR gas denitrifying technology there is also numerous problems at engineer applied: (1) vanadium titanio SCR catalyst has relatively larger toxicity, and its spent catalyst belongs to danger waste materials, it is necessary to specialized company processes；(2) non-catalytic component based on vanadium is susceptible to sulfur poisoning, it is difficult to process high-sulfur flue gas；(3) vanadium titanio SCR catalyst operating temperature is generally 300-400 DEG C, it is difficult to be applied to the denitration engineering of the low non-electricity industry of exhaust gas temperature.
Beijing University of Technology has successfully developed low-temperature SCR catalyst that operating temperature be 160-400 DEG C at present, and completed industrialization process, and has carried out Demonstration Application in fields such as coking, glass, waste incineration and chemical industry.But, catalyst is (< 220 DEG C) when cold operation, SO in flue gas2When concentration is higher, have NH at catalyst surface4HSO4Deposition attachment, makes catalysqt deactivation.The present invention relates to a kind of microwave heating SCR reactor, utilize microwave heating to promote NH4HSO4Decompose, make SCR catalyst realize in-situ regeneration when not dismantling.If flue-gas temperature is lower than the operating temperature (160-180 DEG C) of low-temperature SCR catalyst, it is possible to use microwave heating SCR catalyst body, to reaction temperature, makes SCR reaction be smoothed out, it is to avoid to directly heat flue gas.Comparing with flue gas temperature raising mode, this kind of mode of heating can save heat energy.
Microwave is frequency electromagnetic wave between 0.3-300GHz, in recent years, chemical reaction process imports microwave heating technique, not only can be effectively improved reaction conversion ratio, selectivity, and embodying the plurality of advantages such as energy-saving and environmental protection, it attracts widespread attention as one of means realizing green chemical industry.
In recent years, microwave chemical reaction research is achieved with remarkable progress, and Zhou Jicheng etc. (CN102133516A) discloses a kind of laboratory scale microwave catalysis reaction unit, can be used in waste water and exhaust-gas treatment.Shang Hui etc. (CN102949974A, CN105013420A) disclose a kind of microwave heating equipment and can be used in homogeneous reaction.Guo Bin etc. (CN104437075) disclose a kind of microwave reaction device for removing VOCs.At present, people are still very shallow with material mechanism of action understanding to microwave, are also difficult to reaction condition and equipment carry out accurately expection and design, thereby result in the microwave equipment that can be used for the reaction of commercial scale chemistry also less.
The present invention, based on microwave technology advantage, and combines industry denitration reaction device, obtains can be used for the microwave heating SCR reactor of industry SCR process.
Response system device described in the invention mainly includes following components: reactor body, spray ammonia system, even gas distribution device, device heat-insulation layer, microwave generating apparatus, temperature control unit, catalyst module etc..Up to now, there is no the microwave reaction system and device during document and patent report react for SCR.This system can realize application in the following areas:
1, low temperature SCR denitration field, when flue-gas temperature is too low, provides auxiliary heating, it is achieved reaction bed temperature improves and reaches the active window of catalyst, it is achieved the qualified discharge of nitrogen oxides to catalyst module.Owing to only catalyst being heated, it is to avoid a large amount of energy consumptions that a large amount of flue gas are produced, it may be achieved energy efficient, reduce engineering operation cost.
2, in practical application, especially when sulfur-containing smoke gas, low-temperature SCR catalyst bed easily generates the sulfate such as ammonium hydrogen sulfate, catalyst activity is caused to reduce, can pass through to regulate and control microwave input power, adjust bed temperature and reach sulphate decomposition temperature, and then realize the in-situ regeneration of catalyst.This measure, can extend the operations such as the life cycle of catalyst, the dismounting in minimizing catalyst regeneration process, be expected to be greatly lowered denitration cost, alleviate business economic burden.
Summary of the invention
It is an object of the invention to provide a kind of microwave reaction system and device for SCR denitration.
Described a kind of microwave reaction system and device for SCR denitration, mainly in flue gas flow 104Nm3/ h and following scale, it is characterized in that, the part such as including reactor body, even gas distribution device (1), device heat-insulation layer (2), microwave generating apparatus (3), temperature control unit (4), catalyst module (5), spray ammonia system (6):
Reactor body cavity structure, the upper and lower surfaces that reactor body is relative are correspondingly arranged gas feed and gas outlet；Reactor body is airtight cavity, or in four sides, three sides are airtight, and another lateral opening is for the installation of catalyst module (5), and outside reactor body or inner side adds heat-insulation layer (2), is used for reducing thermal loss；Microwave generating apparatus (3) it is externally provided with in the side that reactor body is airtight；Spray ammonia system device (6) and gas uniform device (1) are placed in microwave reaction system and device air inlet side；Temperature measurement unit (4) is with the temperature of thermoelectricity occasionally infrared radiation thermometer assaying reaction device air inlet, beds, gas outlet；Catalyst module (5) is positioned at the cavity of reactor body, can adopt frame or drawer-type structure, it is possible to pass in and out from reactor body overthe openings or side.
1. reactor body described in is stainless steel, and reactor body is airtight cavity, it is possible to three sides are airtight, and a side opening, for the installation of catalyst module, reactor body and the additional heat-insulation layer of main conduit line, reduces thermal loss；
2. spray ammonia system, even gas distribution device are placed in microwave reaction system and device air inlet side, for stainless steel；
3. microwave generating apparatus is placed in around reactor body, four sides or three many mouthfuls of feed-ins of side multi-source, it is ensured that chamber intimate heat is evenly distributed；
4. temp measuring system is with the temperature of thermoelectricity occasionally infrared radiation thermometer assaying reaction device air inlet, beds, gas outlet；
5. SCR denitration modularity described in, convenient installation and replacing, catalyst mode can be integral honeycomb, board-like or corrugated plate dst；
Ammonia is the reducing agent of denitration, with reaction of nitrogen oxides under catalyst action, generates nitrogen and water.
The response system that the present invention relates to and device have applied widely, energy-conserving and environment-protective, simple operation and other advantages, and have good economy and potential industrial application value.
The invention has the beneficial effects as follows:
The advantages such as the microwave reaction system and device that the present invention relates to has important potential application in low-temperature denitration field, it is also possible in projects such as small scall coal-fired boiler smoke gas treatments, have applied widely, easy to operate, at NOxEmission control field has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the microwave reaction system and device figure of gained SCR denitration；1 even gas distribution device, 2 device heat-insulation layers, 3 microwave generating apparatus, 4 temperature measurement units, 5 catalyst modules, 6 spray ammonia system parts；
The microwave reaction system and device catalyst module that Fig. 2 is the SCR denitration of gained extracts sectional view out, is wherein denoted as 2 device heat-insulation layers, 3 microwave generating apparatus, 5 catalyst modules, 6 spray ammonia systems；
Fig. 3 is SCR catalyst performance test curve, tests air speed～4000h-1, reaction bed temperature～200 DEG C, NOx concentration is 1000mg/m3,SO2Concentration is 500mg/m3。
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is explained, but the present invention is not limited to following example.
Embodiment 1
Concrete structure is shown in Fig. 1-2.
Microwave generating apparatus:
Microwave input power can need to be adjusted according to reaction bed temperature, catalyst material etc., and microwave operational frequencies adopts 2450MHz, and microwave adopts reactor body surrounding or three many mouthfuls of feed-ins of face width band, uniform to ensure reactor cavity intimate heat.
Catalyst module:
Preformed catalyst adopt modular filling, catalyst according to actual flue gas condition it needs to be determined that.Catalyst module entirety is done drawer type and is installed, it is simple to the filling of catalyst and replacing.Drawer outside adds heat-insulation layer, does encapsulation process with reactor body part junction, it is prevented that microwave leakage.
Response system is evaluated:
In formed honeycomb Catalyst packing to reactor, air speed～4000h will be regulated-1, reaction bed temperature～200 DEG C, NOx concentration is 1000mg/m3,SO2Concentration is 500mg/m3, measure outlet NO with nitrogen-oxide analyzer, (Thermo42i)xConcentration, result is as shown in Figure 3.
Summary of the invention is schematically described by foregoing in conjunction with accompanying drawing, disclosed related description, and the person skilled of this area can realize easily, it is clear that the realization of the present invention is not limited to the restriction of aforesaid way.
Claims (5)
1. the microwave reaction system and device for SCR denitration, it is characterized in that, mainly include reactor body, even gas distribution device (1), heat-insulation layer (2), microwave generating apparatus (3), temperature measurement unit (4), catalyst module (5), spray ammonia system device (6) part；
Reactor body cavity structure, the upper and lower surfaces that reactor body is relative are correspondingly arranged gas feed and gas outlet；Reactor body is airtight cavity, or in four sides, three sides are airtight, and another lateral opening is for the installation of catalyst module (5), and outside reactor body or inner side adds heat-insulation layer (2), is used for reducing thermal loss；Microwave generating apparatus (3) it is externally provided with in the side that reactor body is airtight；Spray ammonia system device (6) and gas uniform device (1) are placed in microwave reaction system and device air inlet side；Temperature measurement unit (4) is with the temperature of thermoelectricity occasionally infrared radiation thermometer assaying reaction device air inlet, beds, gas outlet；Catalyst module (5) is positioned at the cavity of reactor body, adopts frame or drawer-type structure, it is possible to pass in and out from reactor body overthe openings or side.
2. a kind of microwave reaction system and device for SCR denitration described in claim 1, it is characterised in that reactor body adopts stainless steel；Even gas distribution device (1) adopts stainless steel.
3. a kind of microwave reaction system and device for SCR denitration described in claim 1, it is characterised in that microwave generating apparatus is placed in around reactor body, surrounding or three many mouthfuls of feed-ins of side multi-source.
4. a kind of microwave reaction system and device for SCR denitration described in claim 1, it is characterised in that SCR denitration form is integral honeycomb, board-like or corrugated plate dst.
5. a kind of microwave reaction system and device for SCR denitration described in claim 1, it is characterised in that realize the adjustment of molding reaction bed temperature by controlling the output of microwave generating apparatus.
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| CN201610189005.2A CN105727745A (en) | 2016-03-29 | 2016-03-29 | Microwave reaction system device for SCR denitration |
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| CN201610189005.2A CN105727745A (en) | 2016-03-29 | 2016-03-29 | Microwave reaction system device for SCR denitration |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108380044A (en) * | 2018-04-09 | 2018-08-10 | 北京水木星源环保科技有限公司 | A kind of selective catalytic reduction SCR denitration device and selective catalytic reduction SCR denitration method |
| CN108525515A (en) * | 2018-06-12 | 2018-09-14 | 朋仁锋 | A kind of kiln SCR denitration technique |
| CN109579033A (en) * | 2018-12-13 | 2019-04-05 | 西安建筑科技大学 | The burner and its analoging detecting device and method of volatile organic compounds |
| CN111231397A (en) * | 2020-02-10 | 2020-06-05 | 北京华电光大环境股份有限公司 | Continuous pleating equipment and SCR plate type catalyst |
| CN111495173A (en) * | 2019-01-30 | 2020-08-07 | 中国科学院过程工程研究所 | Microwave coupling denitration dust removal integrated device |
| CN112169585A (en) * | 2020-10-10 | 2021-01-05 | 江苏龙净科杰环保技术有限公司 | Anti-tar poisoning flue gas denitration reactor and method for simply regenerating tar poisoning catalyst |
| CN113209919A (en) * | 2020-01-21 | 2021-08-06 | 中国石油化工股份有限公司 | Microwave coupling catalytic reactor and VOCs treatment facility |
| CN113209918A (en) * | 2020-01-21 | 2021-08-06 | 中国石油化工股份有限公司 | Microwave coupling catalytic reactor and VOCs treatment facility |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108380044A (en) * | 2018-04-09 | 2018-08-10 | 北京水木星源环保科技有限公司 | A kind of selective catalytic reduction SCR denitration device and selective catalytic reduction SCR denitration method |
| CN108525515A (en) * | 2018-06-12 | 2018-09-14 | 朋仁锋 | A kind of kiln SCR denitration technique |
| CN109579033A (en) * | 2018-12-13 | 2019-04-05 | 西安建筑科技大学 | The burner and its analoging detecting device and method of volatile organic compounds |
| CN111495173A (en) * | 2019-01-30 | 2020-08-07 | 中国科学院过程工程研究所 | Microwave coupling denitration dust removal integrated device |
| CN113209919A (en) * | 2020-01-21 | 2021-08-06 | 中国石油化工股份有限公司 | Microwave coupling catalytic reactor and VOCs treatment facility |
| CN113209918A (en) * | 2020-01-21 | 2021-08-06 | 中国石油化工股份有限公司 | Microwave coupling catalytic reactor and VOCs treatment facility |
| CN111231397A (en) * | 2020-02-10 | 2020-06-05 | 北京华电光大环境股份有限公司 | Continuous pleating equipment and SCR plate type catalyst |
| CN111231397B (en) * | 2020-02-10 | 2021-12-28 | 北京华电光大环境股份有限公司 | Continuous pleating equipment and SCR plate type catalyst |
| CN112169585A (en) * | 2020-10-10 | 2021-01-05 | 江苏龙净科杰环保技术有限公司 | Anti-tar poisoning flue gas denitration reactor and method for simply regenerating tar poisoning catalyst |
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Application publication date: 20160706 |