CN107715667A - A kind of microwave ammonium persulfate excites the flue gas hydrargyrum-removing method and system of flying dust induced radical - Google Patents
A kind of microwave ammonium persulfate excites the flue gas hydrargyrum-removing method and system of flying dust induced radical Download PDFInfo
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- CN107715667A CN107715667A CN201710919050.3A CN201710919050A CN107715667A CN 107715667 A CN107715667 A CN 107715667A CN 201710919050 A CN201710919050 A CN 201710919050A CN 107715667 A CN107715667 A CN 107715667A
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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
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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
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
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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
- B01D53/73—After-treatment of removed components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
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- B01D2257/602—Mercury or mercury compounds
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Abstract
The present invention relates to the flue gas hydrargyrum-removing method and system that a kind of microwave ammonium persulfate excites flying dust induced radical；The system includes microwave spray reactor, contains Hg from burner0Flue gas removing dust cooling after enter microwave spray reactor；Microwave-excitation flying dust activates ammonium persulfate in microwave sprays reactor and produces hydroxyl and potentiometric titrations by the Hg in flue gas0It is oxidized to divalence mercury solution；Divalence mercury solution enters after mercury knockout tower by being separated and recovered after adding sulfidion reaction generation mercuric sulphide precipitation；The system can realize Hg0100% removing, and subtractive process non-secondary pollution has wide market application foreground.
Description
Technical field
The present invention relates to filed of flue gas purification, and in particular to a kind of microwave ammonium persulfate excites the cigarette of flying dust induced radical
Qi exhaustion mercury system.
Background technology
Mercury is a kind of traces of heavy metals element of hypertoxicity, has greatly harm to health and ecological environment.Combustion
Coal burning boiler is the maximum man-made pollution source of mercury emissions.China is the big consumption of coal state of the first in the world, the ratio of coal in energy resource structure
Example up to 75%, and this general layout does not have big change still within the quite a long time from now on.With pollution that caused by coal burning
Thing air environmental protection standard it is increasingly strict, it is contemplated that in the near future, coal-fired flue-gas mercury pollution control standard appearance will be must
Right trend.Therefore, it is the weight that Environmental Protection in China scientific and technical personnel face to research and develop effective coal-fired flue-gas mercury pollution control method
Want one of task.
In recent years, domestic and foreign scholars have done a large amount of fruitful work in research demercuration new theory and new technical field.
At present, in numerous demercuration methods, adsorbent absorption and wet scrubbing, which are considered as two of coal-fired flue gas mercury removal field, most to be had
The main flow demercuration technology of development potentiality.Most study is to apply existing wet process of FGD in wet scrubbing demercuration technology
System combined washing demercuration, the technology can realize higher Hg2+ (g) removal efficiencies, but not bright to the Hg0 (g) of indissoluble
Aobvious removal effect, partial oxidation state mercury are also possible to be reduced to Elemental Mercury.Many scholars are attempted with some oxidation technologies de-
By Hg0 (g) initial oxidations in flue gas it is Hg2+ (g) before sulphur tower, then washs removing Hg2+ with wet method fume desulfurizing system again
(g).Studying more SCR (SCR) catalysis oxidation demercuration at present can realize that part Hg0 (g) is converted into Hg2+
(g), but demercuration effect is significantly affected by coal-fired component, catalyst type, combustion system and burner structure, related
Catalysis oxidation mechanism is still not very clear.Other oxidation technologies, such as the Yangization ﹑ photochemical catalytic oxidations of Deng gas ions and ozone oxidation
Deng being still in the laboratory exploratory stage.Using conventional oxidation agent such as Gao mangaic acids Jia ﹑ potassium peroxydisulfates and sodium chlorites in absorption tower
Oxidative absorption Hg0 (g) also achieves good result, but expensive there is also absorbent or the deficiencies of product component is complicated difficult,
Correlation technique needs further perfect.Absorption method is mainly adsorbed in flue gas by activated carbon or other adsorbents
Hg2+ (g) and Hg0 (g), is first translated into particulate Hg, is then captured using existing cleaner and reach demercuration
Purpose.Studying the most ripe active carbon adsorption of more and technology at present has higher demercuration efficiency, but application cost pole
Height, enterprise are difficult to bear.Other adsorbents, such as your Jin Shu ﹑ Jin category Yangization Wu ﹑ Fei Hui ﹑ Huo Jiao ﹑ calcium Ji Cai Liao ﹑ molecular sieves
And although natural minerals etc. have potential development prospect, due to steady in application cost, demercuration efficiency, adsorbent
The shortcoming of qualitative and adsorption mechanism research etc. and deficiency, can not also obtain large-scale industrial application at present.To sum up institute
State, there is presently no a kind of coal-fired flue gas mercury removal technology for being suitable for large-scale commercial.
The content of the invention
It is an object of the invention to overcome technical problem present in prior art, there is provided a kind of microwave ammonium persulfate excites
The flue gas mercury removal system of flying dust induced radical；Enter microwave spray after making the cooling of the flue gas removing dust containing Hg0 from burner
Reactor is drenched, microwave-excitation flying dust activates ammonium persulfate generation hydroxyl in microwave sprays reactor and potentiometric titrations will
Hg0 in flue gas is oxidized to divalence mercury solution, and divalence mercury solution enters after mercury knockout tower by adding sulfidion reaction production
Separated and recovered after raw mercuric sulphide precipitation；The system can realize Hg0 100% removing, and subtractive process non-secondary pollution, tool
There is wide market application foreground.
The course of reaction and general principle of present system are as follows：
(1) microwave (MW) excites the potentiometric titrations of flying dust (Fly ash) catalytic decomposition ammonium persulfate generation high activity
And hydroxyl radical free radical.Specific course of reaction can be represented by equation below (1)-(2).As shown in figure 1, we use electronics certainly
Rotation resonance kaleidophon, which has successfully been measured in removing system, generates potentiometric titrations and hydroxyl radical free radical, so as to confirm
Above-described general principle.
(2) (1)-potentiometric titrations and hydroxyl radical free radical caused by (2) is reacted more than has superpower oxidisability, energy
Enough by the Hg in flue gas0It will be bivalent mercury.Detailed process can use shown in following chemical reaction (3)-(6).
·OH+Hg0→Hg++OH- (3)
·OH+Hg+→Hg2++OH- (4)
(3) divalence mercury solution caused by oxidation more than enters after mercury knockout tower produces sulphur by adding sulfidion reaction
Separated and recovered after changing mercury precipitation.The system can realize Hg0 100% removing, and subtractive process non-secondary pollution, have wide
Wealthy market application foreground.
To realize object above, the technical solution adopted by the present invention is as follows：
The present invention provides the flue gas mercury removal system that a kind of microwave ammonium persulfate excites flying dust induced radical, the system bag
Deduster, cooler, blower fan, flue and chimney are included, the deduster, cooler, blower fan, chimney are sequentially connected in series by flue；
The system includes microwave spray reactor；Described microwave spray reactor passes through flue and cooler and fans in series, institute
Stating microwave spray reactor, but Kong gas Ru Kou ﹑ cooling airs Chu Kou ﹑ Yan gas Ru Kou ﹑ flue gases go out including solution spraying anti-Ying Qu ﹑ Leng
The total Ru Kou ﹑ microwave magnetrons An Zhuan Qu ﹑ quartz glass dividing plate of the total Yan Qi Chu Kou ﹑ cooling airs of the total Yan gas Ru Kou ﹑ of Kou ﹑, oxidant
Supplement tower, solution pump；
Described microwave spray reactor is made up of multiple solution spraying reaction zone parallel connections, the solution spraying reaction zone with
Microwave magnetron installing zone arranged for interval successively, separated by quartz glass dividing plate among 2 regions；
The smoke inlet and exhanst gas outlet are located at the both sides of solution spraying reaction zone respectively；The solution spraying reaction zone
Centre is set side by side with multiple nozzles；The nozzle connects oxidant by solution pump and supplements tower, and the oxidant is persulfuric acid
Ammonium salt solution；Total smoke inlet connects each smoke inlet, and total exhanst gas outlet connects each exhanst gas outlet, total smoke inlet
Connected respectively with flue with total exhanst gas outlet.
Cooling air intake and the cooling air outlet is located at the both sides of microwave magnetron installing zone respectively；The microwave
Magnetron installing zone is provided with multiple microwave magnetrons；The cooling air intake is respectively communicated with cooling air main entrance and cold
But air outlet slit.
The microwave spray reactor bottom is provided with tipper, and the inclination trench bottom is provided with product exit and circulation
Liquid exports；The product exit is connected with mercury knockout tower；Circulation fluid exports to be connected with oxidant supplement tower.
The overall width W of the microwave spray reactor is between 0.2m-8m；Microwave sprays the total length L position of reactor
Between 0.2m-8m；The overall height H of microwave spray reactor is between 0.2m-10m.
The width b of the solution spraying reaction zone is between 0.1m-0.6m.
Horizontal spacing a between the microwave magnetron is between 0.1m-0.8m；The lateral arrangement spacing of the nozzle is
2a, it is 1.5a to be longitudinally arranged spacing.
The atomization droplets diameter that the nozzle sprays is not more than 80 microns, and microwave sprays the microwave irradiation power in reactor
Density is 20W/m3-1600W/m3.
The present invention also provides the flue gas hydrargyrum-removing method that a kind of microwave ammonium persulfate excites flying dust induced radical, methods described
Completed based on described microwave spray reactor, first, entered after making the cooling of the flue gas removing dust containing Hg0 from burner
Microwave spray reactor, by microwave-excitation flying dust microwave spray reactor in activate ammonium persulfate solution produce hydroxyl and
Hg0 in flue gas is oxidized to divalence mercury solution by potentiometric titrations, and divalence mercury solution enters after mercury knockout tower by addition two
The reaction of valency sulphion separates and recovers after producing mercuric sulphide precipitation.
The optium concentration of flying dust is 0.2g/m3-200g/m3 in described flue gas；Temperature in the microwave spray reactor
Degree should be controlled at 25-160 DEG C.
Effective liquid-gas ratio of the ammonium persulfate solution and flue gas is 1-12L/m3, and the valid density of ammonium persulfate solution is
Between 0.05mol/L-2.5mol/L, the pH of solution is between 0.1-9.9；
Hg0 content is not higher than 1000 in the flue gas；Described burner is that Ran coals Guo Lu ﹑ industry kilns roads or rubbish burn
Burn any one of stove.
Microwave-excitation flying dust in the described microwave spray reactor active oxidation agent over cure in microwave sprays reactor
Sour ammonium produces hydroxyl and potentiometric titrations and the Hg0 in flue gas is oxidized into divalence mercury solution, and divalence mercury solution separates into mercury
By being separated and recovered after adding sulfidion reaction generation mercuric sulphide precipitation after tower；The system can realize the 100% of Hg0
Removing, and subtractive process non-secondary pollution, have wide market application foreground.
Advantages of the present invention and remarkable result：
Chinese patent (ZL201310683054.8) proposes a kind of method based on uviol lamp coupling flue demercuration and is
System, and Chinese patent (ZL201010296592.8) then proposes a kind of flue gas demercuration based on photochemical advanced oxidation
System.Two above patent proposes by inventor team, is that the two patents use with maximum difference of the invention
Ultraviolet light is as excitaton source.It is well known that penetration range of the ultraviolet light in water is extremely short.There is relevant report to show, even if
It is in pure water, effective propagation distance of 254nm short wave ultraviolet lights also only has several centimetres, and this can cause reaction unit to be difficult to
Maximization.In addition, the transmission that the impurity such as particulate matter can seriously hinder ultraviolet light in actual coal-fired flue-gas be present, and then influence light
The safe and highly efficient operation of chemical removal system.Therefore, the serious commercial Application for constraining photochemistry removing system of above deficiency.
Microwave activation removing system of the present invention can effectively overcome techniques discussed above problem.It is different from ultraviolet light
, microwave can effectively penetrate solid and liquid, and the penetration range of microwave in the solution it is longer than ultraviolet light it is more (with it is micro-
Ripple stove heat food is similar).In addition, microwave technology has obtained large-scale application in industry and daily life, have fine
Engineering use and practical experience.Therefore, microwave activation free radical system has much higher industry than UV-activated system
Change application prospect.Microwave ammonium persulfate of the present invention excites the flue gas mercury removal system of flying dust induced radical to realize Hg0
100% removing, disclosure satisfy that the technical requirements of the coal-burning boiler newly put into effect of country and the ultra-clean discharge of kiln gas, have wide
The wealthy market development and application prospect.
Brief description of the drawings
Fig. 1 is the living radical measure figure in microwave-excitation flying dust catalytic decomposition ammonium persulfate system, spectrum peak in figure
Represent potentiometric titrations and hydroxyl radical free radical；
Fig. 2 is the overall schematic of present system；
Fig. 3 is the layout drawing (top view) of microwave spray reactor inner nozzle and microwave magnetron key device.
Fig. 4 is the layout drawing (front view) of microwave spray reactor inner nozzle and microwave magnetron key device.
In figure, 1- burners, 2- flues, 3- dedusters, 4- coolers, 5- microwaves spray reactor, 6- mercury knockout towers, 7-
Solution pump, 8- oxidants supplement tower, 9- blower fans, 10- chimneys；The total smoke inlets of 501- therein, the total exhanst gas outlets of 502-,
503- nozzles, 504- microwave magnetrons, 505 tippers, 506- solution, the outlet of 507- circulation fluids, 508- product exits, 509-
Cooling air main entrance, 510- cooling air intakes, the outlet of 511- cooling airs, 512- smoke inlets, 513- exhanst gas outlets,
514- microwaves spray reactor wall, 515- solution spraying reaction zones, 516- microwave magnetron installing zones, 517- quartz glass every
Plate.
Embodiment
The present invention relates to the flue gas mercury removal system that a kind of microwave ammonium persulfate excites flying dust induced radical.From burner
Containing Hg0 flue gas removing dust cooling after enter microwave spray reactor.Microwave-excitation flying dust is living in microwave sprays reactor
Change ammonium persulfate generation hydroxyl and the Hg0 in flue gas is oxidized to divalence mercury solution by potentiometric titrations.Divalence mercury solution enters
By being separated and recovered after adding sulfidion reaction generation mercuric sulphide precipitation after mercury knockout tower.The system can realize Hg0's
100% removing, and subtractive process non-secondary pollution, have wide market application foreground.
Embodiment 1：
Microwave ammonium persulfate excites the flue gas mercury removal system of flying dust induced radical：As shown in Figure 2,3, 4, a kind of microwave mistake
Ammonium sulfate excites the flue gas mercury removal system of flying dust induced radical, and the system includes deduster 3, cooler 4, blower fan 9, cigarette
Road 2 and chimney 10, the deduster 3, cooler 4, blower fan 9, chimney 10 are sequentially connected in series by flue 2；The system includes micro-
Ripple sprays reactor 5；Described microwave spray reactor 5 is connected by flue 2 with cooler 3 and blower fan 9, the microwave spray
Drenching reactor 5 includes the ﹑ cooling airs of 515 ﹑ cooling air intakes of the solution spraying reaction zone 510 outlet ﹑ of 511 ﹑ smoke inlets 512
The total ﹑ microwave magnetron installing zones of 502 ﹑ cooling airs main entrance of exhanst gas outlet 509 of the total ﹑ of smoke inlet 501 of the ﹑ of exhanst gas outlet 513
516 ﹑ quartz glass dividing plates 517, oxidant supplement tower 8, solution pump 7；
Described microwave spray reactor 5 is made up of multiple parallel connections of solution spraying reaction zone 515, the solution spraying reaction
Area 515 and microwave magnetron installing zone 516 arranged for interval successively, separated by quartz glass dividing plate 517 among 2 regions；
The smoke inlet 515 and exhanst gas outlet 515 are located at the both sides of solution spraying reaction zone respectively；The solution spraying
Multiple nozzles 503 are set side by side among reaction zone 515；
The nozzle 503 connects oxidant by solution pump 7 and supplements tower 8, and the oxidant is ammonium persulfate solution；It is described
Total smoke inlet 501 connects each smoke inlet 512, and total exhanst gas outlet 502 connects each exhanst gas outlet 513, total smoke inlet
501 and total exhanst gas outlet 502 connected respectively with flue 2.
Cooling air intake 510 and the cooling air outlet 511 is located at the two of microwave magnetron installing zone 516 respectively
Side；The microwave magnetron installing zone 516 is provided with multiple microwave magnetrons 504；The cooling air intake (510) is respectively
Connect cooling air main entrance 509 and cooling air outlet 511.
Microwave spray reactor 5 bottom is provided with tipper 505, and the bottom of tipper 505 is provided with product and gone out
Mouth 508 and circulation fluid outlet 507；The product exit 508 is connected with mercury knockout tower 6.
The width b of each solution spraying reaction zone 515 of described microwave spray reactor 5 is between 0.1m-0.6m；
The overall width W of microwave spray reactor 5 is between 0.2m-8m；Horizontal spacing a between microwave magnetron 504 is in 0.1m-
Between 0.8m；The total length L of microwave spray reactor 5 is between 0.2m-8m；Microwave sprays the overall height H position of reactor 5
Between 0.2m-10m.The lateral arrangement spacing of nozzle 503 is 2a (horizontal spacings of a between microwave magnetron), longitudinal cloth
It is 1.5a to put spacing.
The atomization droplets diameter that the nozzle sprays is not more than 80 microns, and microwave sprays the microwave irradiation power in reactor
Density is 20W/m3-1600W/m3.
Based on said system, the flue gas hydrargyrum-removing method that a kind of microwave ammonium persulfate excites flying dust induced radical is also provided,
Methods described operation is as follows, first, enters microwave spray reaction after making the cooling of the flue gas removing dust containing Hg0 from burner
Device, activate ammonium persulfate solution in microwave sprays reactor by microwave-excitation flying dust and produce hydroxyl and potentiometric titrations
Hg0 in flue gas is oxidized to divalence mercury solution, divalence mercury solution reacts after entering mercury knockout tower by adding sulfidion
Separated and recovered after producing mercuric sulphide precipitation.
The optium concentration of flying dust is 0.2g/m3-200g/m3 in described flue gas；Temperature in the microwave spray reactor
Degree should be controlled at 25-160 DEG C.
Effective liquid-gas ratio of the ammonium persulfate solution and flue gas is 1-12L/m3, and the valid density of ammonium persulfate solution is
Between 0.05mol/L-2.5mol/L, the pH of solution is between 0.1-9.9；
Hg0 content is not higher than 1000 in the flue gas；Described burner is that Ran coals Guo Lu ﹑ industry kilns roads or rubbish burn
Burn any one of stove.
Microwave-excitation flying dust in the described microwave spray reactor active oxidation agent over cure in microwave sprays reactor
Sour ammonium produces hydroxyl and potentiometric titrations and the Hg0 in flue gas is oxidized into divalence mercury solution, and divalence mercury solution separates into mercury
By being separated and recovered after adding sulfidion reaction generation mercuric sulphide precipitation after tower；The system can realize the 100% of Hg0
Removing, and subtractive process non-secondary pollution, have wide market application foreground.
Embodiment 2：
Hg0 concentration in flue gas is 60, and flue-gas temperature is 40 DEG C, and the molar concentration of ammonium persulfate is 0.1mol/L, solution
PH is 3.8, and flying dust concentration is 6g/m3, and microwave irradiation power density is 200W/m3, liquid-gas ratio 2L/m3.Pilot run is：
Hg0 removal efficiency can reach 43.1% in flue gas.
Embodiment 3：
Hg0 concentration in flue gas is 60, and flue-gas temperature is 40 DEG C, and the molar concentration of ammonium persulfate is 0.2mol/L, solution
PH is 3.8, and flying dust concentration is 6g/m3, and microwave irradiation power density is 200W/m3, liquid-gas ratio 2L/m3.Pilot run is：
Hg0 removal efficiency can reach 54.7% in flue gas.
Embodiment 4：
Hg0 concentration in flue gas is 60, and flue-gas temperature is 40 DEG C, and the molar concentration of ammonium persulfate is 0.2mol/L, solution
PH is 3.8, and flying dust concentration is 6g/m3, and microwave irradiation power density is 400W/m3, liquid-gas ratio 2L/m3.Pilot run is：
Hg0 removal efficiency can reach 69.9% in flue gas.
Embodiment 5：
Hg0 concentration in flue gas is 60, and flue-gas temperature is 40 DEG C, and the molar concentration of ammonium persulfate is 0.2mol/L, solution
PH is 3.8, and flying dust concentration is 6g/m3, and microwave irradiation power density is 400W/m3, liquid-gas ratio 3L/m3.Pilot run is：
Hg0 removal efficiency can reach 87.1% in flue gas.
Embodiment 6：
Hg0 concentration in flue gas is 60, and flue-gas temperature is 40 DEG C, and the molar concentration of ammonium persulfate is 0.3mol/L, solution
PH is 3.8, and flying dust concentration is 6g/m3, and microwave irradiation power density is 400W/m3, liquid-gas ratio 3L/m3.Pilot run is：
Hg0 removal efficiency can reach 94.2% in flue gas.
Embodiment 7：
Hg0 concentration in flue gas is 60, and flue-gas temperature is 40 DEG C, and the molar concentration of ammonium persulfate is 0.4mol/L, solution
PH is 3.8, and flying dust concentration is 6g/m3, and microwave irradiation power density is 500W/m3, liquid-gas ratio 3L/m3.Pilot run is：
Hg0 removal efficiency can reach 100% in flue gas.
Embodiment 8：
Hg0 concentration in flue gas is 60, and flue-gas temperature is 90 DEG C, and the molar concentration of ammonium persulfate is 0.4mol/L, solution
PH is 3.8, and flying dust concentration is 6g/m3, and microwave irradiation power density is 500W/m3, liquid-gas ratio 3L/m3.Pilot run is：
Hg0 removal efficiency can reach 91.2% in flue gas.
Comprehensive Correlation by above example understands that embodiment 7 has optimal removal effect, and removal efficiency reaches
100%, it can be consulted and used as most preferred embodiment.
Claims (10)
1. a kind of microwave ammonium persulfate excites the flue gas mercury removal system of flying dust induced radical, the system includes deduster（3）、
Cooler（4）, blower fan（9）, flue（2）And chimney（10）, the deduster（3）, cooler（4）, blower fan（9）, chimney（10）
Pass through flue（2）It is sequentially connected in series；Characterized in that, the system also includes microwave spray reactor（5）；Described microwave spray
Reactor（5）Pass through flue（2）With cooler（4）And blower fan（9）Series connection, the microwave spray reactor（5）Sprayed including solution
Drench reaction zone（515）﹑ cooling air intakes（510）﹑ cooling airs export（511）﹑ smoke inlets（512）﹑ exhanst gas outlets
（513）The total smoke inlets of ﹑（501）The total exhanst gas outlets of ﹑（502）﹑ cooling airs main entrance（509）﹑ microwave magnetron installing zones
（516）﹑ quartz glass dividing plates（517）, oxidant supplement tower（8）, solution pump（7）；
Described microwave spray reactor（5）By multiple solution spraying reaction zones（515）Parallel connection is formed, the solution spraying reaction
Area（515）With microwave magnetron installing zone（516）Arranged for interval successively, by quartz glass dividing plate among 2 regions（517）Every
Open；
The smoke inlet（515）And exhanst gas outlet（515）It is located at the both sides of solution spraying reaction zone respectively；The solution spray
Drench reaction zone（515）Centre is set side by side with multiple nozzles（503）；The nozzle（503）Pass through solution pump（7）Connect oxidant
Supplement tower（8）, the oxidant is ammonium persulfate solution；Total smoke inlet（501）Connect each smoke inlet（512）,
Total exhanst gas outlet（502）Connect each exhanst gas outlet（513）, total smoke inlet（501）With total exhanst gas outlet（502）Respectively with cigarette
Road（2）Connection.
2. the cooling air intake（510）Exported with cooling air（511）It is located at microwave magnetron installing zone respectively（516）
Both sides；The microwave magnetron installing zone（516）Multiple microwave magnetrons are installed（504）；The cooling air enters
Mouthful（510）It is respectively communicated with cooling air main entrance（509）Exported with cooling air（511）.
3. system according to claim 1, it is characterised in that the microwave sprays reactor（5）Bottom is provided with inclination
Groove（505）, the tipper（505）Bottom is provided with product exit（508）Exported with circulation fluid（507）；The product exit
（508）With mercury knockout tower（6）Connection；The oxidant is ammonium persulfate solution.
4. system according to claim 1, it is characterised in that the microwave sprays reactor（5）Overall width W be located at
Between 0.2m-8m；Microwave sprays reactor（5）Total length L between 0.2m-8m；Microwave sprays reactor（5）Total height
H is spent between 0.2m-10m.
5. system according to claim 1, it is characterised in that the solution spraying reaction zone（515）Width b be located at
Between 0.1m-0.6m.
6. system according to claim 1, it is characterised in that the microwave magnetron（504）Between horizontal spacing a exist
Between 0.1m-0.8m；The nozzle（503）Lateral arrangement spacing be 2a, it is 1.5a to be longitudinally arranged spacing.
7. system according to claim 1, it is characterised in that the nozzle（503）The atomization droplets diameter of ejection is little
In 80 microns, microwave sprays reactor（5）Interior microwave irradiation power density is 20 W/m3- 1600 W/m3。
8. a kind of microwave ammonium persulfate excites the flue gas hydrargyrum-removing method of flying dust induced radical, it is characterised in that methods described base
Completed in the system described in claims 1, first, make to contain Hg from burner0Flue gas removing dust cooling it is laggard in a subtle way
Ripple sprays reactor, and activating ammonium persulfate solution in microwave sprays reactor by microwave-excitation flying dust produces hydroxyl and sulfuric acid
Root free radical is by the Hg in flue gas0Divalence mercury solution is oxidized to, divalence mercury solution enters after mercury knockout tower by adding divalent sulfur
Ionic reaction separates and recovers after producing mercuric sulphide precipitation.
9. according to the method for claim 6, it is characterised in that the optium concentration of flying dust is 0.2g/m in described flue gas3-
200g/m3；Temperature in the microwave spray reactor should be controlled at 25-160 DEG C.
10. according to the method for claim 6, it is characterised in that effective liquid-gas ratio of the ammonium persulfate solution and flue gas
For 1-12 L/m3, for the valid density of ammonium persulfate solution between 0.05mol/L-2.5mol/L, the pH of solution is located at 0.1-
Between 9.9；
According to the method for claim 6, it is characterised in that Hg in the flue gas0Content be not higher than 1000；Institute
The burner stated is any one of Ran coals Guo Lu ﹑ industry kilns roads or waste incinerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710919050.3A CN107715667B (en) | 2017-09-30 | 2017-09-30 | Flue gas demercuration method and system for exciting fly ash induced free radicals by microwave ammonium persulfate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710919050.3A CN107715667B (en) | 2017-09-30 | 2017-09-30 | Flue gas demercuration method and system for exciting fly ash induced free radicals by microwave ammonium persulfate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107715667A true CN107715667A (en) | 2018-02-23 |
| CN107715667B CN107715667B (en) | 2019-12-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104785076A (en) * | 2015-04-21 | 2015-07-22 | 南京朗洁环保科技有限公司 | Method for simultaneous desulfurization denitrification and mercury removal based on hydroxyl and sulphate radical oxidation |
| CN105565465A (en) * | 2015-12-15 | 2016-05-11 | 广东工业大学 | Method for treating phthalate wastewater by means of catalyzing persulfate by utilization of supported activated carbon in microwave inducement manner |
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| CN104785076A (en) * | 2015-04-21 | 2015-07-22 | 南京朗洁环保科技有限公司 | Method for simultaneous desulfurization denitrification and mercury removal based on hydroxyl and sulphate radical oxidation |
| CN105565465A (en) * | 2015-12-15 | 2016-05-11 | 广东工业大学 | Method for treating phthalate wastewater by means of catalyzing persulfate by utilization of supported activated carbon in microwave inducement manner |
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