CN209476008U - A kind of low-temperature denitration of flue gas catalytic reaction system - Google Patents
A kind of low-temperature denitration of flue gas catalytic reaction system Download PDFInfo
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- CN209476008U CN209476008U CN201821687122.2U CN201821687122U CN209476008U CN 209476008 U CN209476008 U CN 209476008U CN 201821687122 U CN201821687122 U CN 201821687122U CN 209476008 U CN209476008 U CN 209476008U
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- flue gas
- ammonia
- gas
- desulfurization
- oxidator
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Abstract
This application provides a kind of low-temperature denitration of flue gas catalytic reaction system, including boiler, for ammonia unit, deduster, desulfurization unit, heater, NO oxidator, flue gas-ammonia mixer, catalytic reduction reactor and chimney；By being arranged deduster after boiler, dust is eliminated on catalyst life and active influence；Avoid the escaping of ammonia problem existing for the simple ammonia process of desulfurization；Rationally setting heater, enhances the adaptability of device, when larger fluctuation occurs for flue-gas temperature, is able to carry out self-control to adapt to the operating condition of variation；Denitration efficiency is improved by adding NO oxidator.
Description
Technical field
The utility model relates to gas denitrifying technology fields, select more particularly to the boiler smoke low temperature in power plant and chemical plant
Selecting property catalysis reduction SCR denitration catalyst reaction device.
Background technique
Nitrogen oxides (NOx) is one of the arch-criminal for causing haze, acid rain, photochemical fog and greenhouse effects.China
It is the big NOx emission state of the first in the world, NOx, which administers (denitrating flue gas), becomes the weight that improvement is forced in national " 12th Five-Year Plan " atmosphere pollution
Point.As country is to the pay attention to day by day of atmosphere pollution, China proposes tightened up requirement to NOx emission in succession.2015 12
Month, State Ministry of Environmental Protection, the Committee of Development and Reform, energy ring office publication " implementing in full coal-burning power plant's minimum discharge and reducing energy consumption programme of work ",
It is required that east, middle part and west area are basically completed minimum discharge transformation before 2017,2018 and the year two thousand twenty respectively.
Selective catalytic reduction (Selective Catalytic Reduction, abbreviation SCR) denitration technology is mature, imitates
Rate is high, stability is good, becomes the current mainstream technology and developing direction for administering NOx both at home and abroad, wherein SCR technology core is de-
Denox catalyst.SCR technology has many advantages, such as denitration efficiency height compared with other technologies, and technology maturation is current domestic and international flue gas
The most technology of denitration engineer application.According to the preference temperature scope of catalyst, SCR can be divided into high temperature, in mild low temperature process,
Its temperature is respectively as follows: high temperature SCR technique: 450~590 DEG C；Medium temperature SCR technique: 260~380 DEG C；Low-temperature SCR technique: 80~
300℃。
Low-temperature SCR technique can be such that denitrification apparatus is placed in after desulfurization and dust-extraction unit, to reduce sulphur, flying dust etc. to catalysis
Agent pollution and toxic hazard.With NH3Or urea be reducing agent selective catalytic reduction (Selective Catalytic Reduction,
Hereinafter referred to as SCR) it is current industry (such as nitric acid, salt made from earth containing a comparatively high percentage of sodium chloride tail gas clean-up, diesel engine vent gas purification and Thermal Power Generation Industry tail gas denitration
Deng) apply most NOx removal technologies.The oxidation efficiency of NO significantly affects entire denitration efficiency in quick SCR reaction, main to send out
Raw reaction is as follows:
2NO+O2→2NO2 (1)
2NH3+NO+NO2→2N2+3H2O (2)
Studies have shown that working as n (NO2When)/n (NOx)=0.5, the reduction efficiency highest of quick SCR.Due to Thermal Power Generation Industry NOx
The content of NO is generally 90% or more in tail gas, therefore carries out oxidation to the NO in flue gas in advance and denitration efficiency can be improved.
SCR is V using catalyst the most mature at present2O5/TiO2Or in V2O5/TiO2On the basis of be modified urge
Agent, but vanadium titanium system's SCR catalyst traditional at present just has greater activity when operation temperature is higher than 350 DEG C, therefore can only
SCR reactor is arranged between economizer and deduster.But it is mostly empty without reserved denitration in the position in existing boiler
Between, therefore very big difficulty is brought to the industrial application of SCR technique；Furthermore contain high concentration in the flue gas of the process section
Dust can also generate very strong erosion and poisoning effect to catalyst, influence in dust containing substances such as alkali metal, arsenic and mercury
Its service life.
To save operation and boiler improvement cost, research and development under cryogenic active SCR catalyst and
Corresponding technique has important economy and practical significance.
Utility model content
The purpose of this utility model is to provide a kind of low-temperature denitration of flue gas catalytic reaction systems.
In order to solve the above technical problems, technical solution provided by the utility model are as follows:
A kind of low-temperature denitration of flue gas catalytic reaction system, including boiler, for ammonia unit, deduster, desulfurization unit, heating
Device, NO oxidator, flue gas-ammonia mixer, catalytic reduction reactor and chimney；
The exhanst gas outlet of the boiler is connected to the gas inlet of the deduster, the exhanst gas outlet of the deduster and institute
Flue gas general import is connected to before stating the desulfurization of desulfurization unit, cigarette after the desulfurization of the gas inlet of the heater and the desulfurization unit
The connection of gas general export, the exhanst gas outlet of the heater are connected to the gas inlet of the NO oxidator, the NO oxidator
Exhanst gas outlet is connected to the flue gas-ammonia mixer gas inlet one；
It is described to be connected to the flue gas-ammonia mixer gas inlet two for ammonia unit with mixed to the flue gas-ammonia
Ammonia is supplied in clutch；
The flue gas-ammonia mixer exhanst gas outlet is connected to the gas inlet of the catalytic reduction reactor, described
The exhanst gas outlet of catalytic reduction reactor is connected to the gas inlet of the chimney.
Preferably, the heater, NO oxidator, flue gas-ammonia mixer and catalytic reduction reactor combine to form frame
Posture tower structure.
Preferably, the deduster is electric precipitator or bag filter.
Preferably, the desulfurization unit is wet desulphurization unit.
Preferably, the NO oxidator is NO catalytic oxidizer.
Preferably, the catalytic reduction reactor is low-temperature SCR catalytic reduction reactor.
The application has beneficial technical effect below:
(1) dust in flue gas is catalyzed SCR in the case that Dust Capacity fluctuates in flue gas by utility model device
The active influence of agent minimizes, and does not influence NO in flue gasxRemoval rate；
(2) in the application, ammonium hydroxide absorbs SOx in desulphurization plant, will escape out ammonia into gas, the ammonia of escape can
Therefore the reducing agent of part as ammonia-method denitration can avoid ammonia existing for the simple ammonia process of desulfurization using the group technology and escape
Ease problem.
(3) in boiler smoke temperature change, it is ensured that into the flue-gas temperature held stationary of catalytic reduction reactor,
Biggish fluctuation will not occur.
(4) before general SCR denitration facility, addition is used for the catalyst tower of catalytic oxidation NO, thus by flue gas
Part NO is oxidized to NO2, when flue gas enters SCR denitration facility, carries out low temperature SCR denitration, quick SCR reaction can be carried out,
Improve denitration efficiency.
(5) the low-temperature denitration of flue gas apparatus structure of the utility model is compact, occupied area is small, improves the reaction effect of technique
Rate.
Detailed description of the invention
Fig. 1 is that a kind of working principle for low-temperature denitration of flue gas catalytic reaction system that the embodiments of the present invention provide is shown
It is intended to.
In figure: 1 boiler；2 for ammonia unit；3 dedusters；4 desulfurization units；5 heaters；6NO oxidator；7 flue gases-ammonia is mixed
Clutch；8 catalytic reduction reactors；9 chimneys.
Specific embodiment
In order to make those skilled in the art more fully understand the utility model, with reference to the accompanying drawing and specifically
The utility model is described in further detail for embodiment.
As shown in FIG. 1, FIG. 1 is a kind of low-temperature denitration of flue gas catalytic reaction systems of the embodiments of the present invention offer
Operation principle schematic diagram.
This application provides a kind of low-temperature denitration of flue gas catalytic reaction system, including boiler 1, for ammonia unit 2, deduster 3,
Desulfurization unit 4, heater 5, NO oxidator 6, flue gas-ammonia mixer 7, catalytic reduction reactor 8 and chimney 9；
The exhanst gas outlet of the boiler 1 is connected to the gas inlet of the deduster 3, the exhanst gas outlet of the deduster 3
It is connected to flue gas general import before the desulfurization of the desulfurization unit 4, the gas inlet of the heater 5 and the desulfurization unit 4
The connection of flue gas after desulfurization general export, the exhanst gas outlet of the heater 5 is connected to the gas inlet of the NO oxidator 6, described
The exhanst gas outlet of NO oxidator 6 is connected to the flue gas-ammonia mixer 7 gas inlet one；
It is described to be connected to the flue gas-ammonia mixer 7 gas inlet two for ammonia unit 2 with to the flue gas-ammonia
Ammonia is supplied in mixer 7；
The flue gas-ammonia mixer 7 exhanst gas outlet is connected to the gas inlet of the catalytic reduction reactor 8, institute
The exhanst gas outlet for stating catalytic reduction reactor 8 is connected to the gas inlet of the chimney 9.
In one embodiment of the application, the heater 5, NO oxidator 6, flue gas-ammonia mixer 7 and catalysis are also
The former combination of reactor 8 forms frame-type tower structure.
In one embodiment of the application, the deduster 3 is electric precipitator or bag filter.
In one embodiment of the application, the desulfurization unit 4 is wet desulphurization unit.
In one embodiment of the application, the NO oxidator 6 is NO catalytic oxidizer.
In one embodiment of the application, the catalytic reduction reactor 8 is low-temperature SCR catalytic reduction reactor.
The utility model connects deduster 3 behind boiler 1, and the influence dust to low-temperature denitration of flue gas technique reduces to most
It is low；
The deduster 3 of selection can be electric precipitator or bag filter；
Dust in flue gas can be catalyzed SCR in the case that Dust Capacity fluctuates in flue gas by the preposition of deduster 3
The active influence of agent minimizes, and does not influence NO in flue gasxRemoval rate.
The desulfurization unit 4 of the utility model takes the ammonia process of desulfurization, and the pH value by controlling relief liquor is greater than 7, can anti-anti-avulsion
Aerosol is formed in the discharge gas of sulphur equipment, while the ammonia by escaping out in desulphurization plant can be used as the reducing agent of denitration reaction,
Desulfurization exterior liquid can decontamination Large Water Treatment Field or other desulfurizers.
Flue gas enters denitration unit after heating after desulfurization by heater 5；Flue gas is discharged into greatly after denitration from chimney 9
Gas so far completes the technical process of dedusting, desulphurization and denitration.
Heater 5 is set after dedusting, desulfurization in the utility model, and the function of heater 5 is not reach in flue-gas temperature
To flue gas when to low-temperature SCR reaction temperature, to guarantee in smoke temperature change, into catalytic reduction reactor 8
Larger fluctuation does not occur for flue-gas temperature, to ensure the NO in flue gasxWith the NH added3It is reacted in preferred temperature reaction interval.
NO oxidator 6 is set before flue gas-ammonia mixer 7 after heater 5 in the utility model, it can be by part
NO is oxidized to NO2, while avoiding NH3It is oxidized to NO, can effectively improve denitration efficiency.
The utility model is preferred, heater 5, NO oxidator 6, flue gas-ammonia mixer 7 and catalytic reduction reaction
The combination of device 8 is made into a frame-type tower structure, so as to effectively improve the heating efficiency and reaction efficiency of denitrating technique, and
Save occupied area.
The NO oxidator 6 is the catalytic tower of catalytic oxidation NO, catalyst its active constituent in the catalytic tower
For V2O5、CeO2、WO3, one of CuOx, MnOx, FeOx, CoOx and CrOx or several mixing with arbitrary proportion；Carrier
For TiO2、Al2O3、SiO2, molecular sieve, one or more of active carbon and carbon nanotube be with the mixing of arbitrary proportion.
Metal oxidation catalyst in the catalytic reduction reactor 8, using honeycomb, the active area of the structure
Greatly, anti-clogging, resistance to poisoning, the excellent characteristics such as aging, catalyst are divided into 3~6 layers, wherein 1 layer is set as reserved layer, are conveniently replaceable
With addition catalyst；The catalyst is generated using honeycomb-like cordierite as carrier using components such as titanium dioxide and Al
Colloidal sol is applied on its surface, then impregnates the active constituents of the metals as catalyst such as V, W, Fe, Mn, Ce, and is added suitable
Measure auxiliary agent；The catalyst has good catalytic activity to SCR reaction.
Embodiment 1 (referring to attached drawing 1)
Contain NO from boiler 1xFlue gas through 3 dedusting of deduster, flue gas enters desulfurization unit 4 after dedusting, in desulfurization
In unit 4, flue gas comes into full contact with misty lye drop, NH3With SOxReaction generates ammonium salt；
Flue gas is after desulfurization, and flue gas enters after heater 5 is further heated to 160~300 DEG C, into NO oxidation reactor
NO partial oxidation at NO in 62, enter back into flue gas-ammonia mixer 7, this flue gas with confess that the ammonia of ammonia unit 2 is abundant
It equably mixes, then enters back into catalytic reduction reactor 8, the NO in catalyst bedxAnd NH3Reaction generates N2And H2O takes off
Flue gas after nitre is discharged into atmosphere from chimney 9.
Catalyst module in catalytic reduction reactor 8 uses honeycomb, and the active area of the structure is big, resists stifled
Plug, resistance to poisoning, the excellent characteristics such as aging, catalyst are divided into 3~6 layers, wherein 1 layer is set as reserved layer, is conveniently replaceable and adds
Catalyst.The catalyst is independent research, using honeycomb-like cordierite as carrier, is generated using components such as titanium dioxide and Al
Colloidal sol is applied on its surface, then impregnates the active constituents of the metals as catalyst such as V, W, Fe, Mn, Ce, and is added suitable
Measure auxiliary agent；The catalyst has good catalytic activity to SCR reaction.
It can be seen that: the denitrating flue gas reaction system of the utility model is directed to for the characteristics of boiler smoke
The improvement of property:
Deduster 3 is arranged after boiler 1, eliminates dust to catalyst life and active influence；
It can avoid the escaping of ammonia problem existing for the simple ammonia process of desulfurization using the group technology；
Rationally setting heater 5, enhances the adaptability of device, when larger fluctuation occurs for flue-gas temperature, Neng Goujin
Row self-control is to adapt to the operating condition changed；
Denitration efficiency is improved by adding NO oxidator 6.
The method and device that the application is not described in detail is the prior art.
Specific embodiment used herein is expounded the principles of the present invention and embodiment, the above implementation
The explanation of example is merely used to help understand the method and its core concept of the utility model.It should be pointed out that for the art
Those of ordinary skill for, without departing from the principle of this utility model, can also to the utility model carry out it is several
Improvement and modification, modifications and modifications also fall within the protection scope of the claims of the utility model.
Claims (1)
1. a kind of low-temperature denitration of flue gas catalytic reaction system, which is characterized in that including boiler, for ammonia unit, deduster, desulfurization list
Member, heater, NO oxidator, flue gas-ammonia mixer, catalytic reduction reactor and chimney；
The exhanst gas outlet of the boiler is connected to the gas inlet of the deduster, and the exhanst gas outlet of the deduster takes off with described
Flue gas general import is connected to before the desulfurization of sulphur unit, and the gas inlet of the heater and the flue gas after desulfurization of the desulfurization unit are total
Outlet, the exhanst gas outlet of the heater are connected to the gas inlet of the NO oxidator, the flue gas of the NO oxidator
Outlet is connected to the flue gas-ammonia mixer gas inlet one；
It is described to be connected to the flue gas-ammonia mixer gas inlet two for ammonia unit with to the flue gas-ammonia mixer
Middle supply ammonia；
The flue gas-ammonia mixer exhanst gas outlet is connected to the gas inlet of the catalytic reduction reactor, the catalysis
The exhanst gas outlet of reduction reactor is connected to the gas inlet of the chimney；
The heater, NO oxidator, flue gas-ammonia mixer and catalytic reduction reactor combine to form the tower knot of frame-type
Structure；
The deduster is electric precipitator or bag filter；
The desulfurization unit is wet desulphurization unit；
The NO oxidator is NO catalytic oxidizer；
The catalytic reduction reactor is low-temperature SCR catalytic reduction reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821687122.2U CN209476008U (en) | 2018-10-17 | 2018-10-17 | A kind of low-temperature denitration of flue gas catalytic reaction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201821687122.2U CN209476008U (en) | 2018-10-17 | 2018-10-17 | A kind of low-temperature denitration of flue gas catalytic reaction system |
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| CN209476008U true CN209476008U (en) | 2019-10-11 |
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| CN201821687122.2U Expired - Fee Related CN209476008U (en) | 2018-10-17 | 2018-10-17 | A kind of low-temperature denitration of flue gas catalytic reaction system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110898667A (en) * | 2019-12-16 | 2020-03-24 | 湖北思搏盈环保科技股份有限公司 | Flue gas treatment control method and system based on impregnated SCR denitration catalyst |
| CN113058427A (en) * | 2021-03-01 | 2021-07-02 | 安徽紫朔环境工程技术有限公司 | Desulfurization and denitrification integrated equipment for power plant |
-
2018
- 2018-10-17 CN CN201821687122.2U patent/CN209476008U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110898667A (en) * | 2019-12-16 | 2020-03-24 | 湖北思搏盈环保科技股份有限公司 | Flue gas treatment control method and system based on impregnated SCR denitration catalyst |
| CN110898667B (en) * | 2019-12-16 | 2021-09-28 | 湖北思搏盈环保科技股份有限公司 | Flue gas treatment control method and system based on impregnated SCR denitration catalyst |
| CN113058427A (en) * | 2021-03-01 | 2021-07-02 | 安徽紫朔环境工程技术有限公司 | Desulfurization and denitrification integrated equipment for power plant |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20191011 Termination date: 20201017 |