CN104056538B - Flue gas purifying system and method with integration of desulfurization and denitrification - Google Patents
Flue gas purifying system and method with integration of desulfurization and denitrification Download PDFInfo
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- CN104056538B CN104056538B CN201410325672.XA CN201410325672A CN104056538B CN 104056538 B CN104056538 B CN 104056538B CN 201410325672 A CN201410325672 A CN 201410325672A CN 104056538 B CN104056538 B CN 104056538B
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Abstract
The invention provides a flue gas purifying system with integration of desulfurization and denitrification. The flue gas purifying system comprises an ozone generator, a washing absorption tower and a chimney, wherein the washing absorption tower comprises a demisting layer, spraying layers and a tower kettle which are sequentially arranged from top to bottom; the tower kettle is externally provided with a circulation pump; the ozone generator is communicated with a flue gas inlet of the washing absorption tower by a first pipeline, so that flue gas is mixed with ozone before entering the washing absorption tower; the ozone generator is communicated with the spraying layers by a second pipeline, and guides ozone into spraying pipelines, so that ozone is mixed with an absorption liquid, and then is sprayed out from the spraying layers; the tower kettle is communicated with the spraying layers by the circulation pumps; a purified flue gas outlet of the washing absorption tower is communicated with the chimney. According to the invention, the process is simple; the occupied area is small; the cost of investment is low; the absorption effect is improved by combining ozone gas phase and liquid phase oxidation; the desulfurization and denitrification rate of the system is improved.
Description
Technical field
The present invention relates to the smoke gas treatment technical field such as smelting, sintering machine, coal-burning boiler, chemical industry is and in particular to a kind of collect
Become flue gas purification system and the flue gas purifying method of desulphurization denitration.
Background technology
The discharge new standard of thermal power plant's atmosphere pollution has significantly tightened up the discharge limit of nitrogen oxides, sulfur dioxide and flue dust
Value, has formulated the special emission limit of tightened up atmosphere pollution for emphasis environment and environmentally sensitive area, and has been additionally arranged hydrargyrum
Emission limit with gas fired-boiler.
Increasingly stringent with pollutant catabolic gene standard it is necessary to remove to multiple pollutant simultaneously, but if to many
Pollutant remove respectively, need to introduce many complete equipments, and face the problems such as investment is huge, and floor space is many.To multi-pollutant simultaneously
Removing can be prevented effectively from the problems referred to above, thus worldwide extensively carried out and smoke multi-pollutant control technology is ground
Study carefully.
Various flue gas multiple pollutant new control technologies continue to bring out, in nox and so in recent years2Removing in, nox's is de-
Remove so to be compared2Much more difficult, therefore mainly from the angle of removing nox, the integrated removing of research flue gas multiple pollutant purifies
Process.Based on the angle of removing nox, simultaneous SO_2 and NO removal technology can be divided into two classes: a class is catalytic reduction method, main utilization
Nox is reduced by catalyst, reducing agent etc., simultaneously desulfurization；Another kind of is oxidative absorption method, using various strong oxidizers and work
Water-fast no is aoxidized and generates no by free love base2, thus and so2Absorb in the later stage simultaneously.
(1) catalytic reduction method:
Power plants denitration commonly used selective catalytic reduction (scr) technique, and scr device is to operating temperature
The requirement of (flue-gas temperature) is higher, but under unit underload, exhaust gas temperature reduces, and the work cigarette temperature of scr can not
Maintain higher temperature, and cold operation is then easily caused catalyst poisoning and lost efficacy.
(2) oxidative absorption method:
More common in oxidative absorption method is Ozonation, and can be prevented effectively from that above-mentioned catalytic reduction method produces asks
Topic, application prospect is more extensive.It mainly uses the strong oxidizing property of ozone and the multiple pollutant in flue gas is oxidized to high price
Remove after state.Ozonation is low relative to energy consumption for additive method, and does not need in subtractive process to introduce other materials and cause
Secondary pollution, operating temperature is relatively low simultaneously, is one kind more promising flue gas desulfurization and denitrification technology.Prior art is to ozone oxygen
Change method also has more concrete application, and it is integrated net that such as patent cn102350190a discloses a kind of flue gas of simultaneous SO_2 and NO removal
Metallization processes and device.It adds strong oxidizer ozone after air-introduced machine, the nitric oxide in flue gas is processed, and leads to
Cross spray ammonia absorption agent the sulfur dioxide in flue gas and nitrogen oxides are removed, utilize strong oxidizer to absorption tower simultaneously
Interior sulphite and nitrite carry out oxidation processes., there is sulphite in the process of this traditional " first neutralizing rear oxidation "
Oxidation is difficult, aoxidizes the problems such as thorough and byproduct compounds are complicated, limits the popularization and application of Ozonation.
To sum up, technical problem further genralrlization ozone oxidation that above-mentioned " first neutralizing rear oxidation " method produces how are solved
The application of method is that those skilled in the art need key problems-solving.
Content of the invention
It is an object of the invention to provide a kind of flue gas purification system of integrated desulfurizing denitration and flue gas purifying method, can be right
Nitrogen oxides in flue gas and oxysulfide carry out sufficient oxidation processes, and effectively solving aoxidizes halfway problem.
The technical scheme that the present invention provides is as follows:
A kind of flue gas purification system of integrated desulfurizing denitration, comprising:
Ozone generating-device, washing absorption tower, chimney,
Wherein, described washing absorption tower includes demisting layer, spraying layer and the tower reactor setting gradually from top to bottom, described tower reactor
Outside setting one circulating pump；
Described ozone generating-device is connected with the gas approach of described washing absorption tower by the first pipeline, so that flue gas is being entered
Mix with ozone before entering described washing absorption tower；Described ozone generating-device is connected with described spraying layer by second pipe,
And import ozone in described spray piping, spray from described spraying layer after so that ozone is mixed with absorbing liquid；
Described tower reactor is connected with described spraying layer by described circulating pump；
The neat stress outlet of described washing absorption tower is connected with described chimney.
It is further preferred that the flue gas purification system of described integrated desulfurizing denitration further includes:
Air-introduced machine, described first pipeline is connected with the gas approach of described washing absorption tower by described air-introduced machine, and institute
The entrance stating air-introduced machine is communicated with a flue simultaneously, so that the cigarette in the ozone and described flue of described first pipeline
Gas mixed before entering described air-introduced machine.
It is further preferred that being provided with uniform device in described flue；
It is further preferred that the gas approach of described washing absorption tower is located at the top of described tower reactor；
It is further preferred that described spraying layer includes shower, nozzle, and described shower is multilamellar；Described nozzle tool
There is hollow cone tangent type structure；
It is further preferred that described circulating pump controls the spray flux of described spraying layer by flow control valve；
It is further preferred that the outside of described tower reactor is additionally provided with an acid solution excavationg pump, described acid solution excavationg pump and described tower
The interface position of kettle is higher than the interface position of described circulating pump and described tower reactor.
It is further preferred that being provided with the ph value sensor for monitoring solution ph in described tower reactor in described tower reactor；
It is communicated with one for supplementing the absorbing liquid pipeline of absorbing liquid to described tower reactor at described tower reactor, and described absorption liquid pipe
One absorbing liquid replenishment valve is set in road.
It is further preferred that described demisting layer includes demisting filter screen and washer jet, described washer jet has hollow knot
Structure.
It is further preferred that described ozone generating-device includes liquid oxygen storage tank, carburator and ozonator；
It is further preferred that described second pipe is connected with described spraying layer by a pair of fluid line, this two-fluid pipe
Road is sleeve pipe, including inner tube and the outer tube being placed on outside this inner tube, and offers uniform aperture on the tube wall of said inner tube.
Present invention also offers a kind of flue gas purifying method of integrated desulfurizing denitration, it adopts integrated desulfurizing as the aforementioned to take off
The flue gas purification system of nitre, comprises the following steps:
Ozone is mixed before the gas approach entering described washing absorption tower with flue gas, and ozone carries out gas phase oxygen to flue gas
Change；
Ozone and the liquid mixing of described circulating-pump outlet, form ozone-water blend absorbent；
Mixed flue gas enters described washing absorption tower with ozone, and described ozone-water blend absorbent sprays through spraying layer
Drench and further liquid phase oxidation is carried out to flue gas, simultaneously to flue gas desulfurization and denitrification；
Flue gas after desulphurization denitration carries out entering described smoke stack emission after demisting is dried through described demister.
It is further preferred that after ozone is mixed with flue gas, described washing absorption tower is introduced into by air-introduced machine；
It is further preferred that ozone is mixed with flue gas, and uniformly enter described washing absorption tower in the duct afterwards；
It is further preferred that described ozone-water blend absorbent flue gas is aoxidized and desulphurization denitration after, to falling
Solution to described tower reactor carries out nitrogen after discharging tower reactor and the extraction of sulfur is reclaimed.
It is further preferred that monitoring the ph value of the absorbing liquid in described tower reactor, when its ph≤5, by described tower reactor
Absorbing liquid is discharged；
It is further preferred that absorbing liquid is supplemented to described tower reactor by described absorbing liquid pipeline, and by described absorbing liquid
Replenishment valve controls liquid level in described tower reactor for the absorbing liquid.
It is further preferred that in described ozone is mixed before the gas approach entering described washing absorption tower with flue gas,
The mol ratio of the no in the ozone being passed through and flue gas is 0.8-1.2；
It is further preferred that in described ozone is mixed with the absorbing liquid at described spraying layer, the ozone being passed through and flue gas
In so2Mol ratio be 0.8-1.2；
It is further preferred that the liquid-gas ratio in described washing absorption tower is 7～10l/m3.
The flue gas purification system of integrated desulfurizing denitration being provided by the present invention and flue gas purifying method, can bring following
At least one beneficial effect:
1. the gas phase of ozone and liquid phase oxidation two ways are combined by the present invention, strengthen assimilation effect.Ozone generating-device
In a part of ozone pass through the first pipeline with entrance washing absorption tower before flue gas mix, the no in flue gas is carried out sufficiently
Gaseous oxidation；The absorption liquid phase that some ozone passes through in the spraying layer in second pipe and washing absorption tower simultaneously is mixed
Close, can be in spray to so being dissolved in water2Carry out liquid phase oxidation, oxidation product is so4 2-.Ozone can in liquid-phase oxidation process
By so2Direct oxidation, to high-valence state compound, need not increase extra oxidation unit, and oxidation effectiveness is more abundant, effectively solving
The halfway problem of oxidation of the prior art.
2. oxidation effect.Present invention introduces the use of the uniform device in air-introduced machine and flue, by flue gas
The eddy current effect of uniform and air-introduced machine, strengthens oxidation effectiveness in gas phase oxidation process for the ozone.Meanwhile, the present invention is also to smelly
The second pipe that oxygengenerating plant is connected with spraying layer, in the form of sleeve pipe, makes gas-liquid mixed more abundant, strengthens to flue gas
Liquid phase oxidation effect.
3. the whole system resource consumption of the present invention is few, operating cost is low, has that flow process is simple, and floor space is little, investment
Low cost, the advantages of denitrification efficiency is high.
Brief description
With reference to the accompanying drawings and detailed description the present invention is described in further detail:
Fig. 1 is a kind of a kind of schematic diagram of embodiment of the flue gas purification system of integrated desulfurizing denitration of the present invention.
Drawing reference numeral illustrates:
1st, flue gas；2nd, air-introduced machine；3rd, washing absorption tower；4th, circulating pump；5th, spraying layer；6th, nozzle；7th, demisting layer；8th, technique
Water；9th, flue gas after purifying；10th, chimney；11st, ozone generating-device；12nd, gaseous oxidation valve；13rd, liquid phase oxidation valve；14th, double
Fluid mixing duct；15th, flow control valve；16th, absorbing liquid replenishment valve；17th, acid solution excavationg pump.
Specific embodiment
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
In the smoke gas treatment technical field such as smelting, sintering machine, coal-burning boiler, chemical industry, the pollutant in flue gas are mainly
No and so2, in the present invention, using ozone gas phase liquid phase oxidation no and so2Reaction mechanism as follows:
no+o3→no2+o2
no2+o3→no3+o2
so2·h2o(aq)+o3→h2so4+o2
In embodiments of the invention one, a kind of flue gas purification system of integrated desulfurizing denitration includes: ozone generating-device,
Washing absorption tower, chimney, wherein, described washing absorption tower includes demisting layer, spraying layer and the tower reactor setting gradually from top to bottom,
Outside setting one circulating pump of described tower reactor；Described ozone generating-device passes through the flue gas of the first pipeline and described washing absorption tower
Inlet communication, makes flue gas mix with ozone before entering described washing absorption tower；Described ozone generating-device passes through second pipe
Road is connected with described spraying layer, and imports ozone in described spray piping, from described spray after making ozone mix with absorbing liquid
Layer sprays；Described tower reactor is connected with described spraying layer by described circulating pump；The neat stress outlet of described washing absorption tower and institute
State chimney connection.The present invention takes full advantage of gaseous oxidation and the liquid phase oxidation characteristic of ozone, on the one hand, ozone washs with entering
Flue gas mixing before absorption tower, realizes to nitrogen oxides fully oxidized by the gaseous oxidation of ozone that (direct oxidation is height
Valence state)；On the other hand, ozone is mixed with the spray-absorption liquid within washing absorption tower, passes through liquid to the oxysulfide in flue gas
Phase oxidation can be converted into high-valence state, and oxidation fully, is prevented effectively from the halfway situation of oxidation.The nitrogen oxides of high-valence state and
Oxysulfide is easier to remove and be extracted to be recycled.
Ozone generating-device passes through the first pipeline, and (pipeline one, with reference to Fig. 1, is provided with gaseous oxidation valve at the first pipeline
12) it is communicated to the gas approach of washing absorption tower or the flue of this gas approach connection it is therefore intended that making flue gas enter
Mix with ozone before washing absorption tower, the nitrogen oxides in flue gas are carried out fully oxidized, be oxidized to high-valence state；Smelly
Oxygengenerating plant passes through second pipe (pipeline two, with reference to Fig. 1, is provided with liquid phase oxidation valve 13 at second pipe) and absorption tower
Interior spraying layer connection, ozone is imported in spraying layer and is mixed with spray liquid, due to ozone pair and mixed so of water2Have relatively
Strong Oxidation, thus the ozone mixing with spray liquid can be directly by so2It is oxidizing to high-valence state.Spray liquid is by high-valence state simultaneously
Nitrogen oxides and oxysulfide absorption, and fall in tower reactor, again the nitrogen in solution in tower reactor and sulfur carried out afterwards reclaiming profit
With completing the fully oxidized removing of the pollutant to flue gas.Neat stress enters chimney heel row from the top of washing absorption tower
Go out, meet the discharge standard of national regulation.The inside of washing absorption tower sets gradually demister, spraying layer and tower from top to bottom
Kettle, because absorption tower is in running, is also easy to produce " mist " that particle diameter is 10--60 micron, " mist " does not contain only moisture, it is also
Dissolved with sulphuric acid, sulfate, sulfur dioxide etc., also easily cause staining and heavy corrosion of blower fan, heat exchanger and flue simultaneously, because
This, proposed the requirement of demisting, completed by demister to absorption equipment.There is absorbing liquid in tower reactor, and by following located at outside
Absorbing liquid is imported the spraying layer in tower by ring pump, so that flue gas is carried out with spray absorption.
Above-described embodiment one is a basic embodiment of the present invention, also it can be optimized, obtain more preferred
Embodiment.
Preferably, the present invention also can introduce air-introduced machine on the basis of embodiment one, and the first pipeline passes through air-introduced machine and washes
Wash the gas approach connection on absorption tower, and the entrance of air-introduced machine is communicated with a flue simultaneously, so that the ozone of the first pipeline
Mixed before entering air-introduced machine with the flue gas in flue.Specifically, the entrance of air-introduced machine is communicated with a flue, and
First pipeline is communicated to described flue, the gas approach of the outlet extremely described washing absorption tower of described air-introduced machine.Can
With reference to Fig. 1, flue gas 1 is mixed with ozone in the flue of the entrance connection of air-introduced machine 2, the eddy current effect through air-introduced machine
Afterwards, the oxidation effectiveness to nitrogen oxides in effluent for the ozone can be further enhanced.It is highly preferred that the flue gas before air-introduced machine entrance
At pipeline, uniform device is set, flue gas can be made to be uniformly distributed, so that ozone is mixed with flue gas fully, also can strengthen ozone to nitrogen in flue gas
The oxidation effectiveness of oxide.
Preferably, the gas approach of washing absorption tower is located at the top of described tower reactor.
Preferably, the spraying layer in tower reactor includes shower, nozzle, and shower is multilamellar, for example, 3-5 layer, spray
Amount is larger, it is possible to increase adsorption efficiency；And nozzle has hollow cone tangent type structure, structure is simple, and atomization is uniform, user
Just.
Preferably, it is used in basic embodiment connecting tower reactor and the circulating pump of spraying layer controls institute by flow control valve
State the spray flux of spraying layer, regulation during convenient use, for example can be adjusted according to exhaust gas volumn.
Preferably, the outside of tower reactor is additionally provided with an acid solution excavationg pump, the interface position of described acid solution excavationg pump and described tower reactor
Put the interface position higher than described circulating pump and described tower reactor.Because the absorbing liquid within tower reactor is followed between tower reactor and spraying layer
Circulation moves, and absorbing liquid after spraying layer spray with flue gas nitrogen oxides and oxysulfide carry out adsorption reaction, run one
After the section time, in tower reactor, the ph value of absorbing liquid can change, and need in the present invention to monitor this ph value more than 5, otherwise adsorb
Reaction efficiency will substantially reduce.Preferably, in tower reactor, the ph value sensor of solution ph in tower reactor is monitored in setting one；Work as prison
Measure absorbing liquid in tower reactor ph value be less than or equal to 5 after, by the acid solution excavationg pump that is connected with tower reactor by the part in tower reactor
Solution is discharged.Meanwhile, at tower reactor, connection one is used for supplementing the absorbing liquid pipeline of absorbing liquid to this tower reactor, when absorbing liquid passes through acid
After liquid excavationg pump is discharged, new absorbing liquid is supplemented into tower reactor by absorbing liquid pipeline；And setting one suction in absorbing liquid pipeline
Receive liquid replenishment valve, for controlling tower reactor interior suction to receive the magnitude of recruitment of liquid.
Preferably, the demisting layer in tower reactor includes demisting filter screen and washer jet, and described washer jet has hollow-core construction,
And the cleaning solution at demisting layer is fresh water (FW) (process water).
In the present invention, ozone generating-device belongs to ozone application technical field, can be discharge type generating meanss or electricity
Solution water generating device.Discharge type generating meanss pass through to be electrolysed air or pure oxygen, generate ozone, but the content of wherein foreign gas
Higher.The ozone that electrolytic water generator produces is dissolved in water and forms function water, and its ozoniferous purity of product is higher, is widely used in
The fields such as beverage, precise part cleaning, surface treatment.The present invention mainly adopts discharge type generating meanss.Preferably, the present invention
Ozone generating-device includes liquid oxygen storage tank, carburator and ozonator, and wherein, liquid oxygen storage tank is the low temperature for storing liquid oxygen
Storage tank, may replace the multiple round transport of gas cylinder, saves manpower and cost, is the first-selection of central gas supply；Carburator is a kind of work
Industry and civilian energy-saving equipment, effect is that the gas of liquid is converted into gaseous gas；Ozonator is smelly for producing
Carrier of oxygen (o3) device.Ozone is easily decomposes cannot to be stored, and need formed in-situ onsite application (can carry out short in the case of special
The storage of time), so every place that can use ozone is both needed to use ozonator.When using, in liquid oxygen storage tank
Liquid oxygen is changed into gaseous oxygen by carburator, is produced by ozonator more afterwards and obtains ozone.
It is preferable that described second pipe is connected with described spraying layer by a pair of fluid line in the use of the present invention,
This two-fluid pipeline is bushing type pipeline, and it includes inner tube and the outer tube being placed on outside this inner tube, and opens on the tube wall of said inner tube
It is provided with uniform aperture.The inner tube of described sleeve pipe formula pipeline is passed through gas (ozone), and outer tube is passed through liquid (spray-absorption liquid), interior
Have uniform aperture on the tube wall of pipe, ozone and spray-absorption liquid can be made to can achieve mixing in sleeve pipe, and mix
More uniform.Wherein it is preferred to, the small aperture that inner pipe wall opens up is 3～5cm, and percent opening is 50～60%.Reference picture
1, the liquid phase oxidation valve 13 band check function on second pipe, prevent liquid from flowing back.
In a complete embodiment of the present invention, with reference to Fig. 1, the flue gas purification system of the integrated desulfurizing denitration of the present invention
Including air-introduced machine 2, washing absorption tower 3, chimney 10, ozone generating-device 11, washing absorption tower 3 include from top to bottom demisting layer 7,
Spraying layer 5 and the tower reactor being located at washing absorption tower 3 bottom.Flue gas 1 after dedusting enters air-introduced machine 2 from flue, and smelly
Oxygengenerating plant is connected with this flue by the first pipeline (being provided with gaseous oxidation valve 12 at the first pipeline), makes ozone
Mix before entering air-introduced machine with flue gas, and be provided with uniform device in this flue, so that flue gas and the mixture of ozone is passed through all
The eddy current effect of cloth device and air-introduced machine enters in washing absorption tower 3, and mixing and oxidation effectiveness are all more abundant.Ozone occurs simultaneously
The two-fluid mixing duct by a set of tubular type for the second pipe (being provided with liquid phase oxidation valve 13 at second pipe) of device 11
14 connect with spraying layer 5, and the inner tube of two-fluid mixing duct 14 is ozone, be spray liquid, inner tubal wall is evenly equipped with outer tube
Aperture, makes ozone be sufficiently mixed with spray liquid, obtains ozone-water blend absorbent, and sprays at nozzle 6.Molten in tower reactor
Liquid is communicated at spraying layer by circulating pump 4, is spray liquid, and mixes with ozone, and spray flux is entered by flow control valve 15
Row controls.When the solution ph in tower reactor is less than or equal to 5, by acid solution excavationg pump 17, part solution is discharged, and pass through
Absorbing liquid pipeline new solution of supplement into tower reactor；And an absorbing liquid replenishment valve 16 is set in absorbing liquid pipeline, for controlling
The magnitude of recruitment of absorbing liquid in tower reactor.And the interface position of acid solution excavationg pump 17 and tower reactor is higher than the interface position of circulating pump 4 and tower reactor
Put.On the top of washing absorption tower 3, demisting layer 7 carries out demisting using fresh water (FW) 8 to flue gas, and after the purification obtaining, flue gas 9 is from cigarette
Discharge in chimney 10.
In a specific embodiment, flue gas condition to be clean is as follows: c (so2)=1200mg/m3, c (no)=450mg/
m3, 120 DEG C of flue-gas temperature, after dedusting enter the present invention flue gas purification system in, the ozone straying quatity of ozone generating-device with
In flue gas, nitric oxide production mol ratio is 1.0, and tower reactor ph value controls 6.0 about, and washing absorption tower liquid-gas ratio controls in 8l/
m3, absorb through ozone gas phase liquid phase oxidation, smoke desulfurization efficiency is 95%, denitration efficiency is 80%.
Present invention also offers a kind of flue gas purifying method of integrated desulfurizing denitration, which employs above-mentioned integrated desulfurizing and take off
The flue gas purification system of nitre.In an embodiment of the flue gas purifying method of the present invention, comprise the following steps:
Ozone is mixed before the gas approach entering described washing absorption tower with flue gas, and ozone carries out gas phase oxygen to flue gas
Change；(step)
Ozone and the liquid mixing of described circulating-pump outlet, form ozone-water blend absorbent；(step 2)
Mixed flue gas enters described washing absorption tower with ozone, and described ozone-water blend absorbent sprays through spraying layer
Drench and further liquid phase oxidation is carried out to flue gas, simultaneously to flue gas desulfurization and denitrification；(step 3)
Flue gas after desulphurization denitration carries out entering described smoke stack emission after demisting is dried through described demister.(step 4)
In the embodiment of above-mentioned flue gas purifying method, do not limit the enforcement order of each step, such as step one and step
Two can be carried out simultaneously.This embodiment is the basic embodiment of the flue gas purifying method of the present invention, also can make improvements,
Obtain more preferably embodiment.
Preferably, after ozone is mixed with flue gas, described washing absorption tower is introduced into by air-introduced machine, so can be utilized and draw
The eddy current effect of blower fan, strengthens the oxidation effectiveness to the nitrogen oxides in flue gas for the ozone.
Preferably, ozone is mixed with flue gas, and uniformly enters described washing absorption tower in the duct afterwards.Can be by flue gas
In pipeline, setting uniform device realizes ozone and flue gas is mixed uniform, so that ozone is mixed homogeneously with flue gas, and then can improve smelly
The gaseous oxidation efficiency of oxygen.
Preferably, described ozone-water blend absorbent flue gas is aoxidized and desulphurization denitration after, to falling after rise to described
Solution in tower reactor carries out nitrogen after discharging tower reactor and the extraction of sulfur is reclaimed, and so not only can be prevented effectively from secondary pollution, with
When also nitrogen sulfur can be recycled, turn waste into wealth.When extracting recovery, elemental sulfur or nitrogen can be obtained by technique, or
Other modes are extracted.
Preferably, in order to ensure the adsorption efficiency to pollutant in flue gas for the washing absorption tower, the absorption in tower reactor need to be ensured
The ph value of liquid is more than 5, and after less than or equal to 5, then adsorption efficiency just has decline by a relatively large margin.One ph value monitoring can be set
Whether the ph value that liquid received by device to monitor tower reactor interior suction meets requirement.When the ph value of absorbing liquid in tower reactor is less than or equal to 5, by tower
Absorbing liquid in kettle is discharged.And absorbing liquid can be supplemented to tower reactor by absorbing liquid pipeline, and controlled by an absorbing liquid replenishment valve
Liquid level in tower reactor for the absorbing liquid, that is, control the absorption liquid measure in tower reactor.
Preferably, in the step that ozone is mixed before entering the gas approach of washing absorption tower with flue gas, be passed through is smelly
The mol ratio of the no in oxygen and flue gas is 0.8-1.2, so can effectively ensure that ozone to the nitrogen oxides in flue gas more
Fully, and be unlikely to be passed through more ozone amount, cause the waste of ozone.In this step, the ozone amount being passed through also can be according to cigarette
The content of the nitrogen oxides in gas is adjusted, using more convenient.
Preferably, so in the step that ozone is mixed with the absorbing liquid at spraying layer, in the ozone being passed through and flue gas2's
Mol ratio is 0.8-1.2, so can effectively ensure that ozone is more abundant to the oxidation of oxysulfide, and is unlikely to cause ozone
Waste.In this step, the ozone amount being passed through also can be adjusted according to the content of the oxysulfide in flue gas, using more just
Prompt.
Preferably, the liquid-gas ratio in described washing absorption tower is 7～10l/m3, can effectively ensure that washing absorption tower runs more
For safety, and ensure the relatively high adsorption rate to pollutant in flue gas.
In the concrete application of the present invention, the former flue gas after removing dust is before entering air-introduced machine and from ozone generating-device
Road ozone gas be sufficiently mixed, the no gas in flue gas is oxidized to high-valence state nitrogen oxides, and enters into washing absorption
In tower, with the ozone-water blend absorbent counter current contacting from spraying layer, nox and so2Oxidation through absorbent absorption and ozone
After be converted into certain density nitric acid and sulphuric acid, and fall after rise in tower reactor.And flue gas enters demisting layer demisting after desulphurization denitration
It is dried, finally enter smoke stack emission.Solution in tower reactor squeezes into spraying layer as absorbent through circulating pump, and is entering spraying layer
Mix with the other road ozone gas from ozone generating-device before, dissolved with ozone absorbing liquid to the pollutant in flue gas
It is circulated absorption.When the ph value of the solution in tower reactor is less than 5, part acid solution is discharged through acid solution excavationg pump, the suction in tower reactor
Receive agent to be supplemented by absorbing liquid replenishment valve by absorbing liquid pipeline, stop when liquid level reaches requirement supplementing absorbing liquid.And tower
The acid solution discharged in kettle is concentrated using conventional method, separation obtains sulphuric acid and nitric acid product.Fresh water (FW) is pressurized to deliver to demisting
Layer is rinsed, and prevents fouling.
Ozone gas phase liquid phase oxidation two ways is combined by the present invention, strengthens assimilation effect, and the liquid phase oxidation of ozone is straight
Connect and oxysulfide is oxidizing to high-valence state compound, extra oxidation unit, and the certain density tower reactor obtaining need not be increased
Acid solution also can be sold further processed one-tenth finished product.Whole system has flow process simply, and floor space is little, and cost of investment is low, takes off
The advantages of sulfur denitration efficiency is high, and resource consumption is few, operating cost is low.
It should be noted that above-described embodiment all can independent assortment as needed.The above is only the preferred of the present invention
Embodiment it is noted that for those skilled in the art, in the premise without departing from the principle of the invention
Under, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of flue gas purification system of integrated desulfurizing denitration is it is characterised in that include:
Ozone generating-device, washing absorption tower, chimney,
Wherein, described washing absorption tower includes demisting layer, spraying layer and the tower reactor setting gradually from top to bottom, outside described tower reactor
Portion arranges a circulating pump；
The gas approach of described washing absorption tower is arranged at the middle and lower part of described washing absorption tower, and described ozone generating-device passes through
First pipeline is connected with the gas approach of described washing absorption tower, so that flue gas was mixed with ozone before entering described washing absorption tower
Close；Described ozone generating-device is connected with described spraying layer by second pipe, and imports ozone in spray piping, makes ozone
Spray from described spraying layer after mixing with absorbing liquid；
Described tower reactor is connected with described spraying layer by described circulating pump；
The neat stress outlet of described washing absorption tower is connected with described chimney；
Described second pipe is connected with described spraying layer by a pair of fluid line, and described two-fluid pipeline is bushing type pipeline,
It includes inner tube and the outer tube being placed on outside this inner tube, and offers uniform aperture on the tube wall of said inner tube.
2. the flue gas purification system of integrated desulfurizing denitration according to claim 1 is it is characterised in that further include:
Air-introduced machine, described first pipeline is connected with the gas approach of described washing absorption tower by described air-introduced machine, and described draws
The entrance of blower fan is communicated with a flue simultaneously, so that the flue gas in the ozone and described flue of described first pipeline exists
Mix before entering described air-introduced machine.
3. integrated desulfurizing denitration according to claim 2 flue gas purification system it is characterised in that:
It is provided with uniform device in described flue；
And/or
The gas approach of described washing absorption tower is located at the top of described tower reactor；
And/or
Described spraying layer includes shower, nozzle, and described shower is multilamellar；Described nozzle has hollow cone tangent type knot
Structure；
And/or
Described circulating pump controls the spray flux of described spraying layer by flow control valve；
And/or
The outside of described tower reactor is additionally provided with an acid solution excavationg pump, and described acid solution excavationg pump is higher than institute with the interface position of described tower reactor
State the interface position of circulating pump and described tower reactor.
4. integrated desulfurizing denitration according to claim 1 flue gas purification system it is characterised in that:
It is provided with the ph value sensor for monitoring solution ph in described tower reactor in described tower reactor；
It is communicated with one for supplementing the absorbing liquid pipeline of absorbing liquid to described tower reactor at described tower reactor, and in described absorbing liquid pipeline
One absorbing liquid replenishment valve is set.
5. integrated desulfurizing denitration according to claim 1 flue gas purification system it is characterised in that:
Described demisting layer includes demisting filter screen and washer jet, and described washer jet has hollow-core construction.
6. the integrated desulfurizing denitration according to any one of claim 1-5 flue gas purification system it is characterised in that:
Described ozone generating-device includes liquid oxygen storage tank, carburator and ozonator.
7. a kind of flue gas purifying method of integrated desulfurizing denitration it is characterised in that:
Using the flue gas purification system of the integrated desulfurizing denitration described in any one of claim 1-6, it comprises the following steps:
Ozone is mixed before the gas approach entering described washing absorption tower with flue gas, and ozone carries out gaseous oxidation to flue gas；
Ozone and the liquid mixing of described circulating-pump outlet, form ozone-water blend absorbent；
Mixed flue gas enters described washing absorption tower with ozone, and it is right that described ozone-water blend absorbent sprays through spraying layer
Flue gas carries out further liquid phase oxidation, simultaneously to flue gas desulfurization and denitrification；
Flue gas after desulphurization denitration carries out entering described smoke stack emission after demisting is dried through demister.
8. integrated desulfurizing denitration according to claim 7 flue gas purifying method it is characterised in that
After ozone is mixed with flue gas, described washing absorption tower is introduced into by air-introduced machine；
And/or
Ozone is mixed with flue gas, and uniformly enters described washing absorption tower in the duct afterwards；
And/or
Described ozone-water blend absorbent flue gas is aoxidized and desulphurization denitration after, to falling after rise to molten in described tower reactor
Liquid carries out nitrogen after discharging tower reactor and the extraction of sulfur is reclaimed.
9. integrated desulfurizing denitration according to claim 7 flue gas purifying method it is characterised in that
Monitor the ph value of the absorbing liquid in described tower reactor, when its ph≤5, the absorbing liquid in described tower reactor is discharged；
And/or
Absorbing liquid is supplemented to described tower reactor by absorbing liquid pipeline, and absorbing liquid is controlled in described tower reactor by absorbing liquid replenishment valve
In liquid level.
10. integrated desulfurizing denitration according to claim 7 flue gas purifying method it is characterised in that:
In described ozone is mixed before the gas approach entering described washing absorption tower with flue gas, in the ozone being passed through and flue gas
No mol ratio be 0.8-1.2；
And/or
So in described ozone is mixed with the absorbing liquid at described spraying layer, in the ozone being passed through and flue gas2Mol ratio be
0.8-1.2；
And/or
Liquid-gas ratio in described washing absorption tower is 7～10l/m3.
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| CN106512611A (en) * | 2016-12-26 | 2017-03-22 | 合肥天翔环境工程有限公司 | Method for desulfurizing and treating flue gas from boiler of thermal power plant |
| CN106823736A (en) * | 2016-12-29 | 2017-06-13 | 江苏河海新能源股份有限公司 | De- SO2、NOXDevice |
| CN107899333A (en) * | 2017-12-15 | 2018-04-13 | 宜兴市江华环保科技有限公司 | A kind of circulating waters water curtain dedusting deodoriser |
| CN108585083A (en) * | 2018-07-03 | 2018-09-28 | 天津辰创环境工程科技有限责任公司 | A kind of device of processing thionyl chloride waste liquid |
| CN111514735B (en) * | 2020-05-29 | 2024-03-08 | 广东佳德环保科技有限公司 | System and method for desulfurization and denitrification by utilizing ozone |
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| WO2001091885A2 (en) * | 2000-05-30 | 2001-12-06 | Kinetic Biosystems, Inc. | Method and apparatus for wet gas scrubbing |
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