CN104689694B - The devices and methods therefor of combustion product gases denitration desulfurization and dedusting - Google Patents
The devices and methods therefor of combustion product gases denitration desulfurization and dedusting Download PDFInfo
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- CN104689694B CN104689694B CN201510098577.5A CN201510098577A CN104689694B CN 104689694 B CN104689694 B CN 104689694B CN 201510098577 A CN201510098577 A CN 201510098577A CN 104689694 B CN104689694 B CN 104689694B
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Abstract
The present invention relates to the denitration desulfation dust-extraction devices and its method of a kind of combustion product gases, wherein the device has been sequentially connected at least one denitration desulfurization and dedusting module according to combustion product gases flowing direction, each denitration desulfurization and dedusting module includes gas mixing units connected in sequence and air cleaning unit, the gas mixing units include gas mixing inner cavity and the gas inlet and air intlet that are connected with gas mixing inner cavity, the air cleaning unit includes exhanst gas outlet, and the exhanst gas outlet is connected with the gas inlet of next stage denitration desulfurization and dedusting module.The method of denitration desulfurization and dedusting provided by the present invention utilizes air and water cascade denitration, the concentration of oxynitrides is greatly reduced while particulate matter is removed clean, the method that system can quote a variety of wet desulphurizations again sloughs sulfide, this has a very important significance the occasions such as coal-fired plant flue gas improvement, tunnel dedusting, working environment air purification, the removal of restaurant kitchen oil smoke, commercial or home air cleaning.
Description
Technical field
The present invention relates to air purification field more particularly to it is a kind of using air cleaning method to combustion product gases carry out denitration take off
The method of sulphur dedusting and its used device.
Background technology
The situation and problem that combustion product gases are administered：China's primary energy is greatly mostly from fire coal at present, and burning of coal can not
The pernicious gases such as particulate matter, nitric oxide, nitrogen dioxide, sulfur dioxide can be generated with avoiding, pollute environment.It was opened from 2012
Begin, China has promulgated new a collection of flue gas fire coal environmental protection standard successively, and it is very severe to perform requirement.Cut-off 2015, can reach completely
Case to discharge standard is seriously on the low side, the reason is that traditional governance approach is preferable not to the utmost or defective in itself or transports
Row cost is very high.If bag-type dust is difficult to remove particulate matter more smaller than filter opening diameter, the easy dust accumulation of electrostatic precipitation blocks, ammonia
Catalysis method denitration is with high costs etc..
The present patent application is the base of application for a patent for invention (Publication No. CN102000469A, applying date 2010-9-27)
Made improvement on plinth.Specifically, which is related to a kind of whirlwind water-bath air cleaning unit and its cleaning method, band dirt
Air enters centrifugation component, secondary water or recirculated water under the action of component is centrifuged through air inlet pipe, is formed with device cavity inner wall
For support and to centrifuge the coaxial water curtain wall of component, the solid micronic dust or liquid substance in dust laden air are by centrifugation component wink
Between accelerate after along centrifugal direction cut water curtain wall, captured by water curtain wall, and flowed out with the flow of water curtain wall, air is then by anxious by force
Turning, the air after dedusting are exported by gas-guide tube.Air cleaning unit is with the powder of smaller spatial manipulation big flow, big concentration
Dirt, this function is to coal-fired plant flue gas improvement, tunnel dedusting, working environment air purification, the removal of restaurant kitchen oil smoke, commercialization
Or the occasions such as domestic air cleaning have a very important significance.
Although foregoing invention can effectively remove the dust in air, the oxidation removed in gas with dust cannot be synchronized
The pernicious gases such as nitrogen, nitrogen dioxide, sulfur dioxide, it is therefore desirable to be improved to the air cleaning unit.
Invention content
In view of the drawbacks of the prior art, the present invention provides a kind of denitration desulfation dust-extraction device of combustion product gases, the devices
Using air and water cascade denitration, nitrogen oxidation is greatly reduced while the particulate matter in combustion product gases, that is, dust is removed clean and closes
The concentration of object, the method that system can quote a variety of wet desulphurizations again slough sulfide.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is as follows：
The denitration desulfation dust-extraction device of the combustion product gases of the present invention has been sequentially connected at least according to combustion product gases flowing direction
One denitration desulfurization and dedusting module, each denitration desulfurization and dedusting module include gas mixing units connected in sequence and air cleaning
Unit, the gas mixing units include gas mixing inner cavity and the gas inlet that is connected with gas mixing inner cavity and air into
Mouthful, the air cleaning unit includes exhanst gas outlet, the flue gas of the exhanst gas outlet and next stage denitration desulfurization and dedusting module into
Mouth connection.
Further, the air cleaning unit includes at least one centrifugation component, and water inlet pipe is equipped with above the centrifugal device
With dust laden air air inlet pipe, the centrifugation component includes the water diversion disk that sets from top to bottom, centrifugal impeller and what is be reversely open stir
Centrifugal impeller is mixed, gas-guide tube and aqueduct, the export direction of the water inlet pipe are provided with below the air cleaning unit cavity
It is set towards water diversion disk.
Preferably, desulfurization unit is provided with below the air cleaning unit, the desulfurization unit includes being built-in with de-
The water tank of sulphur solution, the lower end of the water inlet pipe are inserted into the water tank, suction pump, the aqueduct are provided on the water inlet pipe
Lower end connected with water tank.
Further, the gas-guide tube is extended to form from the side wall of aqueduct, and dehydration package is equipped in the gas-guide tube,
The dehydration package includes dehydration electric motor and dehydration impeller, the gas-guide tube correspond to the dehydration package and be provided with downcomer.
Preferably, the air cleaning unit cavity inner wall is set as tubulose.
Preferably, the air cleaning unit cavity inner wall is in be inverted cone tubulose in lower position.
In view of the drawbacks of the prior art, the present invention provides a kind of air cleaning methods to synchronize particle in removal combustion product gases
The method of object, denitration desulfurization and dedusting, abbreviation ACS methods.Specifically, used technical solution is：Using above-mentioned combustion product gases
Denitration desulfation dust-extraction device realizes combustion product gases denitration desulfurization and dust-removal method, includes the following steps：
(1) oxidation reactions：The gas inlet of combustion product gases from denitration desulfurization and dedusting module enters in gas mixing units,
Air then enters gas mixing units from air intlet, and it is anti-that oxidation occurs for the oxygen in nitric oxide and air in combustion product gases
Nitrogen dioxide should be generated；
(2) denitration dust collectings react：The nitrogen dioxide contained in the nitrogen dioxide and air of step (1) generation is with cigarette
Gas air-flow enters air cleaning unit, and nitrogen dioxide is reacted with the water in air cleaning unit, generates dust technology and nitric oxide,
The concentration of NOx is greatly lowered very much at this time.
Further, it further includes：
(3) multistages denitration dust collecting reacts：The gas of combustion product gases and generation after step (2) enters next stage and takes off
Nitre desulfurization and dedusting unit repeats step (1)-(2) process, and so on, the concentration of flue gas NOx can decline step by step until up to standard
Discharge.
Further, in step (2), combustion product gases are cleaned using the water added with desulfuration reagent, so as to make
Combustion product gases generate desulphurization reaction in cleaning process.
Preferably, the desulfuration reagent is lime, magnesia or soda lime.
It is highly preferred that by adjust installation air control valve above gas mixing units control flow that air enters and
Flow velocity.
Compared with prior art, beneficial effects of the present invention：
1. by denitration desulfation dust-extraction device, can synchronize oxynitrides in removal combustion product gases, sulfur-containing compound and
Particulate matter in air, working efficiency are high and environmentally friendly.
2. solid micronic dust in air or liquid substance year water curtain wall flow outflow, design of the invention is with smaller sky
Between processing big flow, big concentration combustion product gases, this function is to administering coal-burning power plant and all kinds of fire coal boiler fumes, steel mill
Industrial enterprises' smoke gas treatment and other air purification is waited to have a very important significance.
3. the present invention can according to the factors flexible arrangement such as flow, concentration, free space, such as when need handle high concentration combustion
, can be by multiple denitration desulfurization and dedusting block coupled in series together when burning flue gas, multistage denitration desulfurization and dedusting, until satisfaction.
4. as adsorbing medium --- water, filtering precipitation Posterior circle can be passed through and utilized, environmental protection is inexpensive and without new
Pollution sources generate.
Description of the drawings
Fig. 1 is the structure diagram of the air cleaning unit of the present invention.
Fig. 2 is the principle schematic of the air cleaning unit of the present invention.
Fig. 3 is the structure diagram of the device of the combustion product gases denitration desulfurization and dedusting of the present invention.
Fig. 4 is traditional lime-gypsum method doctor treatment method figure.
Figure number explanation：
Denitration desulfation dust-extraction device：1-gas mixing units；11-gas mixing units cavity；12-gas inlet；
13-air intlet；14-air control valve；2-air cleaning unit；21-air cleaning unit cavity；22-flue gas goes out
Mouthful；23-centrifugation component；3：Desulfurization unit；31-water tank.
Wherein air cleaning unit：23-centrifugation component；232-water diversion disk；233-centrifugal impeller；234-stirring centrifugation
Impeller；235-conical pipe；30-water inlet pipe；40-dust laden air air inlet pipe；50-motor；60-water curtain wall；70-air guide
Pipe；80-dehydration impeller；90-suction pump；100-downcomer；110-aqueduct；120-dust laden air.
Traditional lime-gypsum method desulfurizer：130-sulfur-containing smoke gas air inlet；140-limewash spray head；
150-flue gas after desulfurization exports.
Specific embodiment
In order to make the object, technical solutions and advantages of the present invention definitely, below to the preferred embodiment of the present invention into
The detailed description of row.
Air cleaning unit
The structure of air cleaning unit
As shown in Figure 1, air cleaning unit of the present invention, including air cleaning unit cavity 231, air cleaning list
First 231 top of cavity is equipped with dust laden air air inlet pipe 2 and water inlet pipe 30 and centrifuges the motor 50 of component 23, centrifuges component 23
Including the water diversion disk 41, centrifugal impeller 233 and the agitator arm 43 being reversely open set from top to bottom, dust laden air is through air inlet
Pipe 2 enters centrifugation component, and secondary water or recirculated water are formed under the action of component is centrifuged in air cleaning unit cavity 231
Wall is to rely on and with the coaxial water curtain wall 60 of centrifugal impeller 233, and the solid micronic dust or liquid substance in dust laden air are by centrifugation leaf
Take turns 233 moments accelerate after along centrifugal direction cut water curtain wall 60, captured by water curtain wall 60, and with water curtain wall 60 flow flow out,
Air is then taken a sudden turn by force, and the lower half of device adds one and centrifugal impeller 233 is opposite, the stirring centrifugation that is reversely open
Impeller 234, so as to which the dust for assembling 233 lower section of centrifugal impeller is broken up, dust cuts water curtain wall 60 again after accelerating, and is caught by water
It catches, air is gone successively in the conical pipe 235 of next stage, and since conical pipe 235 makes revolution space become smaller, air is spun up,
Increase dust and 60 frequency of exposure of water curtain wall, increase the number of revolutions of air-flow by force with suck again it is certain be missed consolidate
Body micronic dust or liquid substance, the air after dedusting enter gas-guide tube 700, dehydration impeller 800 and motor are equipped in gas-guide tube 700
50, corresponding dehydration impeller 800 is equipped with downcomer 100, by the outlet of gas-guide tube 700, purified air discharge.
231 lower end of air cleaning unit cavity is equipped with water tank 31, and the water curtain wall 60 for adsorbing dust flows into water tank 31, water inlet pipe
30 one end is also inserted into the water tank 31, and suction pump 90 is equipped in water inlet pipe 30, is taken out the water in water tank 31 by suction pump 90
Enter water inlet pipe 30, water curtain wall 60 is then formed on 231 inner wall of air cleaning unit cavity, so as to form a cyclic process, under
Water pipe 100 is also inserted into the water tank 31.
Water tank 31 connects a water-purifying circulation device, by water-purifying circulation device, is separated from water dust through different programs,
Recycle water.
Fig. 2 is the principle schematic of air cleaning unit cleaning method of the present invention, referring to Fig.2, flow is in centrifugation group
Under the action of part 23, formed using 231 inner wall of air cleaning unit cavity as support and with the coaxial water curtain wall of centrifugal impeller 233
60, for dust laden air 120 under the action of component 23 is centrifuged, the movement locus of micronic dust is that lateral centrifugal force is total to air turning torsion
The parabola of same-action, and air is then downward by turning by force, such micronic dust can be detached from air, be absorbed by water curtain wall 60,
One and the stirring centrifugal impeller 234 that centrifugal impeller 233 is opposite, is reversely open are added in the lower half of centrifugation component 23, so as to
The dust that 233 lower section of centrifugal impeller is assembled is broken up, dust is made to be again introduced into water curtain wall 60, then air is then gone successively to next
Accelerate rotation in the conical pipe 235 of grade, which increase 60 frequency of exposure of dust laden air and water curtain wall, increase the rotation of air-flow by force
Number is cut water curtain wall 60, is captured by water again to suck certain solid micronic dusts or liquid substance being missed again after acceleration,
Air after dedusting is exported by gas-guide tube 700, and the water curtain wall 60 for adsorbing dust flows into water tank 31, and the water in water tank 31 passes through pumping
Water pump 90 enters back into air cleaning unit cavity 231, forms a cyclic process, the water in water tank 31 by water-purifying circulation device into
Row purification, realizes recycling for water.
Air cleaning cell operation principle
Tianjin is determined according to newton, kinetic energy=1/2MV~2, kinetic energy and speed it is square directly proportional.Proportion based on micronic dust is original
It is just more much higher than air, when speed increase, the difference of the kinetic energy of kinetic energy and air acquisition that micronic dust obtains also can with square speed
Degree expands.When the energy that micronic dust obtains is large enough to break away from the viscous force of air, they will be detached from air.The present invention is exactly profit
With this principle, the solid in air or liquid micronic dust or micronic dust group are accelerated using supercentrifuge, are allowed to obtain enough
Kinetic energy is detached from the viscous force of air.In design, the air-flow of centrifugal impeller is turned by force, is just forced moment of turning in air-flow,
The solid or liquid micronic dust of high-energy or micronic dust group will break away from the adhesive tape of air, be smoothed out much along one as bullet
Track moves forward, and cuts in the water curtain wall on periphery, after being flooded stain package, absorption or dissolving, discharges, removes with flow
Air after dirt is discharged into air again after cleaned, dehydration.
It theoretically sees, the spherical micronic dust of 1 micron diameter, in the case where proportion is 3.9, its Unit Weight
It is：2.04E-09 microgram；In the case where radial velocity is acted on for the high speed centrifugation impeller of 29 meter per seconds, moving when it leaves centrifugal impeller
It can be 8.78E-07 joules, vertically cut the distance in water up to 30 microns.
But actually, micronic dust after dust laden air is inhaled into centrifugal device 4, revolves at a high speed usually in more particle agglomeration states
The centrifugal impeller turned can compress air to the root of blade, then throw out again, holding-like solid fraction or liquid exist at this time
One high speed directed jet can be formed under the action of centrifugal force, this significantly increases incision energy.
Estimation：It is assumed that every point of kind of centrifugal device sucks 110 grams a diameter of 1 micron of white fused alumina micronic dust, the leaf of centrifugal impeller
The piece number is 12,2800 revs/min of rotating speed, and the speed of radial velocity is 29 meter per seconds；It is assumed that aggrade of the air when root is compressed
Bulkfactor is 0.3, at this point, for the kinetic energy of jet stream up to 1.40E-03 joules, the distance for entering water is up to 4.88 centimetres of (vacations after uniting
Determine resistance coefficient C=0.6).
This is all a kind of all well and good state, and micronic dust is easy to be captured by water, realizes that micronic dust is detached with air.
But actually, the micronic dust in air is mostly in a kind of clustering phenomena, and individual particle is inactive instead at this time, but when it
When entering high speed centrifugation impeller, due to by the strength in impeller squeezes, shock and vibration and friction, micronic dust individual particle are shown immediately
Must be very active, we once disperseed some white fused alumina micro mists with one wide action speed centrifugal impeller, found by micro- after blade
The stacking states of powder are unexpectedly spongy in half in a short time, are easier to break away from the viscous of air in the dust particale of active state
It is stagnant, it is captured by water.
Air-flow generates high-speed rotational under the action of high speed centrifugation impeller, in middle and lower part, (remaining so as to increase dust laden air
Micronic dust) with the frequency of exposure of inner wall waterwall, increase remaining micronic dust by the viscous chance of water.
Combustion product gases desulphurization denitration dust-extraction unit
As shown in figure 3, the denitration desulfation dust-extraction device of the combustion product gases of the present invention, according to combustion product gases flowing direction sequentially
It is connected at least one denitration desulfurization and dedusting module.Each denitration desulfurization and dedusting module includes gas mixing units connected in sequence
1 and air cleaning unit 2, the concentration of the combustion product gases of denitration desulfurization and dedusting as needed determines denitration desulfurization and dedusting module
Gradation levels.Certainly, the denitration desulfation dust-extraction device of combustion product gases of the invention can only include one group of gas connected in sequence
Mixed cell 1 and air cleaning unit 2, even if only level-one denitration, can also by combustion product gases nitric oxide, titanium dioxide
The concentration of nitrogen reduces about 50%, this denitration effect is also relatively good.
The effect of the gas mixing units 1 is that the nitric oxide allowed in flue gas aoxidizes instead with the life of external air hybrid concurrency
Should, generate nitrogen dioxide, the gas inlet 12 and sky connected including gas mixing inner cavity 11 and with gas mixing inner cavity 11
Gas import 13.The gas inlet 12 is containing the combustion product gases import such as nitric oxide, sulfur dioxide, particulate matter.In order to adjust sky
The flow and flow rate that gas enters needs to install air control valve in the top of the gas mixing units.The adjusting of concentration then with
Content of nitric oxide is reference in combustion product gases, introduces extraneous air in proportion.
The air cleaning unit 2, has air cleaning unit cavity 21, which includes flue gas
Outlet 22, the exhanst gas outlet 22 is connected with the gas inlet 12 of next stage denitration desulfurization and dedusting module, the last one flue gas goes out
Mouth 22 is flue gas exhaust mouth.
Wherein, since the structure of air cleaning unit 2 partly has a detailed description in front, following declaratives are only right
Its connection relation is briefly described.The air cleaning unit 2 includes at least one centrifugation component 23,23 top of centrifugation component
Equipped with water inlet pipe 30 and dust laden air air inlet pipe 40, the centrifugation component 23 includes the water diversion disk 232 set from top to bottom, centrifugation
Impeller 233 and the stirring centrifugal impeller 234 being reversely open, 231 lower section of the air cleaning unit cavity be provided with gas-guide tube and
Aqueduct, the export direction of the water inlet pipe 30 are set towards water diversion disk.Preferably, in the air cleaning unit cavity 231
Wall is set as tubulose.It is highly preferred that 231 inner wall of air cleaning unit cavity is in be inverted cone tubulose in lower position.Value
It must illustrate, even if centrifugation component 23 of the invention does not contain the stirring centrifugal impeller 234 being reversely open, the air cleaning list
The effect of member 2 can also reach the requirement of removal particulate matter.
The lower section of the air cleaning unit 2 is provided with desulfurization unit 3, and the desulfurization unit 3 is molten including being built-in with desulfurization
The water tank 31 of liquid, the lower end of the water inlet pipe 30 are inserted into the water tank 31, suction pump 90, institute are provided on the downcomer 100
The lower end for stating aqueduct 110 is connected with water tank 31.
The side wall of gas-guide tube 70 from the aqueduct 110 extends to form, and dehydration package is equipped in the gas-guide tube 70, described
Dehydration package includes dehydration electric motor 5 and dehydration impeller 80, the gas-guide tube 70 correspond to the dehydration package and be provided with downcomer
100。
Combustion product gases desulphurization denitration dust removal method
Denitration
It is the maximum feature of this technology using air and water cascade denitration.Method provided by the invention is as follows, including such as
Lower step：
(1) oxidation reactions：Combustion product gases enter gas mixing units 1 from the gas inlet 12 of denitration desulfurization and dedusting module
It is interior.With a concentration of reference nitric oxide production in flue gas, large quantity of air is introduced outside system in proportion, the air is then from air intlet
13 enter gas mixing units 1, and combustion product gases is made to be sufficiently mixed in gas mixing units with external air, and the purpose is to enable combustion
Nitric oxide in burning flue gas is reacted with the oxygen in air is converted into nitrogen dioxide.In the step (1), mixed by adjusting gas
Close the flow and flow rate that air control valve is installed above unit air to be controlled to enter.
NO+O2→NO2
(2) denitration dust collectings react：The nitrogen dioxide contained in the nitrogen dioxide and air of step (1) generation is with cigarette
Gas air-flow enters first order air cleaning unit, and nitrogen dioxide is reacted with the water in air cleaning unit, generates dust technology and lacks
New nitric oxide is measured, the concentration of NOx is greatly lowered very much at this time.
3NO2+H2O=2HNO3+NO
4NO2+2H2O+O2=4HNO3
If the desulphurization denitration dust-extraction unit is multistage denitration dust collecting reaction unit, following step is included：
(3) multistages denitration dust collecting reacts：The gas of combustion product gases and generation after step (2) enters next stage and takes off
Nitre desulfurization and dedusting cell processing repeats step (1)-(2) process, and so on, the concentration of flue gas NOx can decline step by step until
Qualified discharge.Theoretically, above-mentioned steps (2) conversion process can only about 3/5 conversion of nitric oxide gas into target product.Due to new
It must be repeated same through next stage denitration desulfurization and dedusting cell processing with the presence of nitric oxide, combustion product gases in the product of generation
The process of sample.Flue gas is cleaned step by step in this way, and nitric oxide concentration step declines up to very low level, can be to every cubic metre 5 milli
Below gram.
Desulfurization
In step (2), combustion product gases are cleaned using the water added with desulfuration reagent, so as to which combustion product gases be made to exist
Desulphurization reaction is generated in cleaning process.Preferably, the desulfuration reagent is lime, magnesia or soda lime.
Gradient multi-staged air cleaning unit provides better platform for a variety of wet desulphurizations.Due in air cleaning unit
The reason of portion's structure and operating system, inside there is a large amount of water or other liquid flowing, Er Qieqi, solid, liquid exchange abnormal
It is active, provide a good environment for many reactions.Addition sulphur dioxide absorbent is just formed different in recirculated water
Desulfurization method.Such as：Lime then similar " lime stone-gypsum " method desulfurization is added in recirculated water, it is then similar " magnesium processes " to add in magnesia
Desulfurization adds in caustic soda then similar to caustic soda wet desulphurization.
Caustic soda wet desulphurization is to absorb SO using NaOH solution2The characteristics of, efficiency is higher, and by-product sodium sulfite ratio
It is more costly.But, sodium hydroxide solution quite dangerous, when use, are careful.
NaOH+SO2→NaHSO3
NaHSO3+NaOH→Na2SO3+H2O。
Wet magnesium oxide desulphurization absorbs the SO in flue gas using magnesium oxide aqueous solution2.China's magnesia is resourceful, and
And renewable, advantage of lower cost.High concentration SO is obtained after absorption2Gas is suitable for manufacturing sulfuric acid or solid sulphur.
Under lime method environment, the SO in limewash or lime thin pulp and flue gas2Reaction becomes calcium sulfite and water row
Go out.Calcium sulfite becomes calcium sulfate (gypsum) precipitation in pond through processing.Traditional lime-gypsum method doctor treatment such as Fig. 4 institutes
Show, sulfur-containing smoke gas is after the entrance of sulfur-containing smoke gas air inlet 130, by the spray head 140 of limewash spray column, by fully reacting
Afterwards from 150 discharge of flue gas after desulfurization outlet.But this method has a shortcoming, needs to remove " gypsum rain "." gypsum rain " refers to passing
The phenomenon that a large amount of vapor escapes are generated during the desulfurization method of limestone-gypsum of system.The vapor of escape carries a large amount of stone secretly
The phenomenon that ash or gypsum and remaining flyash particle are floated in the air, then form sedimentation, cause large-scale " gypsum rain ".
Different from traditional lime-gypsum method, air cleaning elements method allows air-flow at a high speed by the way that (speed can arrive often
Ten meters of number of seconds), gas is different from liquid rheid current through line, final separation.At the same time, limewash quickly flows out, Bu Hui
Fouling and clogging in machine.Traditional lime-gypsum method is due to using traditional limewash spray column, and easily (or water steams for a large amount of aqueous vapor
Gas), lime or gypsum escape, large-scale " gypsum rain " phenomenon is formed on emission source periphery.In spray column, pipeline is easily tied
Dirt blocks, and efficiency reduces.Air cleaning unit generates a stable high pressure gas field at work, and vapor bubble is pierced by moment
It is broken, become liquid.On December 19th, 2014, we once did the compacting of over-saturation aqueous vapor under 6400 cubic metres of tolerance states per hour
Experiment, inlet air flow water content is 3 times of saturation value, and after air cleaning cell processing, exit air-flow relative humidity is maximum
It is 84 to be worth, and has no that aqueous vapor sprays.
The reason of generating such efficiency be：One of sulfur method main feature is that step largely introduces extraneous air, is forced
Combustion product gases cool down.Cooling per level-one, the moisture in gas are just disengaged by force.At 80 degrees Celsius, saturated moist air contains
Water is that every 1 kilogram of dry air contains 560 grams of water；And at 18 degrees Celsius, water content is only 13 grams.Air cleaning unit flue gas
Treating capacity can infinitely increase with power, and whole system can be largely introduced from outside into often in proportion according to denitration and the requirement of cooling
Warm air is finally reached the requirement of compacting vapor escape.
Effect example
Denitrification effect example
On January 29th, 2015, we once did air inflow with air and water and clean stage casing for 2300 cubic metres of air per hour
Denitrification test.NO Standard Gases are introduced with air simultaneously one 6 cubic metres of tunnel to mix naturally.Mixed gas is with per second
21 meters of speed enters air cleaning unit, and the concentration mensuration of NO is 3495ppb, NO before cleaning2A concentration of 11565ppb (i.e.
77%) leading portion conversion ratio is.After the cleaning of air cleaning unit, exit NO concentration falls to 1839ppb, NO2For 6243ppb
(detecting instrument THERMO Scientific Model 42i-TL) declines 47% and 46% respectively.Nitric oxide production removal rate
Although not reaching 3/5 theoretical value, actual effect is pretty good.The NO of escape is mixed again with extraneous air, with
NO2 enters second level air cleaning unit together, repeats same process.And so on, the concentration of NO and NO2 can step by step under
Drop.Generally by two gradient elutions with regard to requirement can be reached.If the concentration of Primordial Qi NO and NO2 are higher, can pass through three-level or
Three-level more than gradient elution.The concentration of final NOx can be dropped in less than 5 milligrams every cubic metre.
Desulfurization effect example
On January 28th, 2015, we once did stage casing desulfurization test using limewash as absorbent with air cleaning method.Sulfur-bearing cigarette
Gas enters denitration desulfation dust-extraction device with 35 meters per second of speed, through first order air cleaning cell processing, SO2Concentration from
2100ppb is down to 98ppb, after the second level and third level air cleaning unit (after two-stage absorbent be water), drops to 37ppb
(detecting instrument THERMO Scientific Model 48i-TLE), desulfurization degree is up to 98%.
Dust removing effects example
Particulate matter is removed totally while denitration or desulfurization, is the another important feature of this technology method.Due to multistage
The presence of air cleaning unit, the particulate matter in flue gas is by tier-framework building, the probability very little of escape.
On June 6th, 2014, we once carried out air cleaning experiment to one 6 tonnes of fire coal boiler fumes.Key data：Air
Flow is 3000 cubic metres per hour, and initial concentration of dust is 300 milligrams every cubic metre, has just reached wanting for discharge by 3 grades
It asks.Its dust removing effects is as follows through organic analysis test center of Guangzhou Geochemistry Inst., Chinese Academy of Sciences testing result：
The mass concentration variation table of the once purged different diameter airborne particle of 1 boiler smoke of table
| Particle size (nm) | Particulate matter quality increases and decreases |
| 10~700 | - 70.7% |
| 80~250 | 49.8% |
| 250~450 | - 76.9% |
| 450~700 | - 98.7% |
The above results show that particulate matter of the grain size more than 0.45 micron is difficult escape.They are almost by water or other liquid
Capture is taken away.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.Here all embodiments can not be exhaustive.It is every to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the row of protection scope of the present invention.
Claims (8)
1. the denitration desulfation dust-extraction device of a kind of combustion product gases, which is characterized in that be sequentially connected with according to combustion product gases flowing direction
There is at least one denitration desulfurization and dedusting module, each denitration desulfurization and dedusting module includes gas mixing units connected in sequence and sky
Gas cleaning unit, the gas mixing units include gas mixing inner cavity and the gas inlet that is connected with gas mixing inner cavity and
Air intlet, the air cleaning unit include exhanst gas outlet, the exhanst gas outlet and next stage denitration desulfurization and dedusting module
Gas inlet connects, and air control valve is installed in the top of the gas mixing units；The air cleaning unit is included at least
One centrifugation component, the top of the centrifugation component are equipped with water inlet pipe and dust laden air air inlet pipe, the centrifugation component include from upper and
The water diversion disk of lower setting, centrifugal impeller and the stirring centrifugal impeller being reversely open, the air cleaning unit cavity lower section are set
There are gas-guide tube and aqueduct, the export direction of the water inlet pipe is set towards water diversion disk.
2. the denitration desulfation dust-extraction device of combustion product gases according to claim 1, which is characterized in that the gas-guide tube is from water guide
The side wall of pipe extends to form, and dehydration package is equipped in the gas-guide tube, and the dehydration package includes dehydration electric motor and dehydration impeller,
The gas-guide tube corresponds to the dehydration package and is provided with downcomer.
3. the denitration desulfation dust-extraction device of combustion product gases according to claim 2, which is characterized in that the air cleaning unit
Lower section be provided with desulfurization unit, the desulfurization unit includes the water tank for being built-in with desulfuration solution, and the lower end of the water inlet pipe is inserted
Enter the water tank, suction pump is provided on the downcomer, the lower end of the aqueduct is connected with water tank.
4. the denitration desulfation dust-extraction device of combustion product gases according to claim 1, which is characterized in that the air cleaning unit
Cavity inner wall is set as tubulose.
5. the denitration desulfation dust-extraction device of combustion product gases according to claim 4, which is characterized in that the air cleaning unit
Cavity inner wall is in lower position in inversion cone tubulose.
6. a kind of combustion product gases denitration desulfurization and dedusting of denitration desulfation dust-extraction device using combustion product gases as described in claim 1
Method, which is characterized in that include the following steps：
(1) oxidation reactions：The gas inlet of combustion product gases from denitration desulfurization and dedusting module enters in gas mixing units, air
Then enter gas mixing units from air intlet, oxidation reaction life occurs for the oxygen in nitric oxide and air in combustion product gases
Into nitrogen dioxide；
(2) denitration dust collectings react：The nitrogen dioxide contained in the nitrogen dioxide and air of step (1) generation is with flue gas gas
Stream enters air cleaning unit, and nitrogen dioxide is reacted with the water in air cleaning unit, generates dust technology and nitric oxide, at this time
The concentration of NOx is greatly lowered very much, wherein in step (2), combustion product gases is carried out using the water added with desulfuration reagent clear
It washes, so as to which combustion product gases be made to generate desulphurization reaction in cleaning process.
7. denitration desulfurization and dust-removal method according to claim 6, which is characterized in that further comprising the steps of：
(3) multistages denitration dust collecting reacts：The gas of combustion product gases and generation after the step (2) enters next stage and takes off
Nitre desulfurization and dedusting unit repeats step (1)-(2) process, and so on, the concentration of flue gas NOx can decline step by step until row up to standard
It puts.
8. denitration desulfurization and dust-removal method according to claim 6, which is characterized in that the desulfuration reagent is lime, oxygen
Change magnesium or soda lime.
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| CN103349893B (en) * | 2013-07-24 | 2015-07-29 | 浙江南化防腐设备有限公司 | A kind of wet denitration method and apparatus |
| CN204637948U (en) * | 2015-03-05 | 2015-09-16 | 广州市合联科技发展有限公司 | The device of combustion product gases denitration desulfurization and dedusting |
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