CN102463015A - Desulfurization and denitrification method and treatment device for marine exhaust gas - Google Patents
Desulfurization and denitrification method and treatment device for marine exhaust gas Download PDFInfo
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- CN102463015A CN102463015A CN2010105408860A CN201010540886A CN102463015A CN 102463015 A CN102463015 A CN 102463015A CN 2010105408860 A CN2010105408860 A CN 2010105408860A CN 201010540886 A CN201010540886 A CN 201010540886A CN 102463015 A CN102463015 A CN 102463015A
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Abstract
The invention discloses a desulfurization and denitrification method and a treatment device for marine exhaust gas. Exhaust gas produced by a marine diesel engine is treated with ozone, hydrogen peroxide and a neutralizing agent, and the neutralizing agent is sodium chloride with the characteristics of high desulfurization and denitrification capacities, low price and extraction from seawater at any time. Being different from high-irritation and toxic ammonia neutralizing agents, on-board permission of sodium chloride is not required, so that the problems of inconvenience in using and managing other similar neutralizing agents and adverse effects on the living environment of shipmen can be solved; and on the other hand, a neutral salt with a high added value is produced in a neutralizing treatment process, and is recovered through an exhaust pipe at the bottom of a reaction groove, so that the recovery rate and reutilization ratio of the neutral salt are increased greatly. Regions are partitioned inside the reaction space of a porous plate for distributing air current, so that ozone treatment, hydrogen peroxide treatment and neutralizing agent treatment are performed separately respectively. Exhaust gas treatment can be performed under a uniform distribution condition, so that treatment efficiency is increased.
Description
[technical field]
Technical field of the present invention belongs to uses ozone, hydrogen peroxide and nertralizer to handle one type in marine diesel engine institute waste discharge gas.Particular content of the present invention is: use cheap, the sodium chloride that can from seawater, extract the at any time nertralizer as desulfurization, denitration.Produce the neutral salt of high additive value in the neutralization reaction process, through the comb recovery of reaction tank bottom.Porous plate distributes air-flow and divides the interior zone of reaction compartment, makes ozone treatment, hydrogen peroxide treatment and nertralizer processing be able to each leisure and independently carries out in the space.
[background technology]
Recently, along with industrial accelerated development, to the also sharply increase of consumption demand of various chemical fuels such as oil, coal.Produce various pernicious gases during the chemical fuel burning and cause atmosphere pollution serious day by day, wherein the most representative example is exactly coal smoke and acid rain.
As stated, discharges such as vehicle motor, coal fired power generation station and factory contain oxysulfide (SO
x) and nitre oxide (NO
x) waste gas, make chemical substance become the main cause of atmosphere pollution.Along with the raising of nearest people's environmental consciousness, not only, also carry out like a raging firely about the research of how to remove waste gas institute's sulfur-containing oxide and nitrogen oxide in the discharging of policy limit oxysulfide, nitrogen oxide.
At first because the oxysulfide that has the greatest impact produces by fuel combustion usually, therefore select for use sulphur removal or not the fuel of sulfur-bearing be to prevent one of method that produces in the combustion process oxysulfide.On policy, carry out the Desulphurization of fuels scheme simultaneously.Encourage to use desulfurized fuels such as sulfur-free gasoline.
But from the aspect of industrial economy property, to use sulfurous fuels inevitably, just must be equipped with this moment in the desulphurization plant and the oxysulfide gas of discharging after the fuel combustion.In order to control oxysulfide gas purging concentration, existing at present legal provisions factory or power station must be equipped with desulphurization plant.
Even have above-mentioned desulphurization plant, the part nitrogen oxide still can't be removed fully, finally arranges to atmosphere, brings the burden that must be equipped with denitration device when being equipped with desulphurization plant thus.For this burden is minimized; Existing people's application is about the method and the device of exhuast gas desulfurization denitration; Be registered in Korea S's publication communique 1999-8963 number (open date: on 02 05th, 1999) and Korean Patent Registration communique 10-355179 number (date of registration: on 09 19th, 2002) separately, be widely known by the people.
With the former corresponding diesel engine exhaust processing method and device, it to the effect that adds hydrogen peroxide H in the waste gas that Diesel engine is discharged
2O
2, it is imported plasma reactor, generate commercial sulphuric acid H through the corona discharge reaction
2SO
4Or nitric acid HNO
3, add nertralizer ammonia NH afterwards
3, change into ammonium salt NH to sulfuric acid and nitric acid
4HSO
4And NH
4NO
3, these ammonium salts can obtain with the mode of collecting, mainly as chemical fertilizer.
Meanwhile, ozone exhuast gas desulfurization denitration method relevant with the latter and device thereof to the effect that makes institute's sulfur-containing oxide and nitrogen oxide and ozone O in the waste gas
3Reaction conversion becomes after sulfuric acid and the nitric acid, makes neutralization reaction with nertralizer ammonia again.In the neutralisation treatment process, generate ammonium salt, collect these ammonium salts and recovery.Porous plate is set to distribute off-gas flows in carrying out the hybrid reaction groove of ozone reaction and neutralization reaction.
In addition, each item sanction measure is put into effect immediately following the environmental protection trend in countries in the world, and making unremitting effort for the control environmental pollution has become trend.Comply with this trend, on boats and ships, handle the scheme that produces oxysulfide and nitrogen oxide in the ship's navigation process about how and be in the exploration step.As a ring of processing scheme, attempt being applied to desulfurization, the denitration facture that use the land on the boats and ships.
The desulphurization denitration method that is suitable for when the land is applied on the boats and ships, owing to use nertralizer ammonia, problem is also following.At first, ammonia is strong, poisonous, the harmful material of a kind of excitant, must be through loaded down with trivial details prior requisition procedure as will aboard ship using and preserve.
Secondly, in case storage tank generation ammonia leak, will life and healthy aspect bring huge adverse effect for the crewman who lives aboard ship.Ammoniacal liquor is generally taken care of in the airtight place of engine room and so on as the nertralizer of handling waste gas.Therefore, in order to prevent that ammoniacal liquor from leaking the keeping of taking every caution against error.
From treatment of waste gas efficient, be example with ozone exhuast gas desulfurization denitration method and device thereof, porous plate is set with the mean allocation air-flow in the hybrid reaction groove, improve reaction efficiency.But in fact, above-mentioned porous plate is arranged on central authorities in the hybrid reaction groove, and ozone spout and nertralizer spout are positioned at the inlet and the outlet of hybrid reaction groove separately, therefore can't improve treatment of waste gas efficient.
In other words, waste gas flows into from the hybrid reaction groove porch that is provided with the ozone spout, because air-flow does not pass through porous plate, ozone treatment can't be carried out under even, safe distribution of air flow condition.In addition, though off-gas flows becomes evenly through porous plate, become inhomogeneous once more in hybrid reaction groove exit.Thus, neutralisation treatment is difficult under even, the safe distribution of air flow condition and carries out.
In the neutralisation treatment process, generate the ammonium salt of high value,, remove fine solid particle, dry collector must be set, i.e. sack cleaner (Bag filter) and electronic precipitator in order to reclaim ammonium salt.Because ammonium salt mixes mutually with fine solid particle, be difficult to separate, bring difficulty for the recycling of ammonium salt.
Moreover, in the removal process of ammonium salt, dry collector can only be used, the wet scrubber that can dissolve ammonium salt can not be used.But pocket type and electronic precipitator can't be caught the hygroscopy powder dust particle that size is 1 μ m (micron).Can't effectively accomplish the desulphurization denitration of waste gas thus handles and dust removal process.
For these reasons; For solving oxysulfide, nitrogen oxide and the fine solid particle problem that takes place in the ship's navigation way; Processing can aboard ship be carried out more efficiently; Eliminate the adverse effect that permanent crewman on the ship is produced simultaneously, make existing exhaust-gas treatment method and device can be applicable to that the improvement scheme of boats and ships tries to explore.
[summary of the invention]
The invention discloses a kind of marine exhaust desulphurization denitration processing method and device; Use the cheap and sodium chloride that can from seawater, extract at any time nertralizer, can fundamentally solve the permission of to go on board especially when using ammonia thus, keeping is loaded down with trivial details and crewman's life and health is caused the problem of adverse effect as nertralizer as desulphurization denitration.The matter of utmost importance that this solves for the present invention.
Secondly, the comb through reaction tank bottom is recovered in the neutral salt that produces high additive value in the waste gas treatment process, and neutral salt just can separate recovery with fine dust thus, the efficient of raising neutral salt recycling.Simultaneously, except that dry collector, can also use the high-efficiency wet-type dust collector of Venturi scrubber (venturi scrubber) and so on, thereby improve the treatment effeciency of fine dust.Second problem that this solves for the present invention
At last; Distribute the porous plate of air-flow to divide the reactive tank inner space; Make ozone treatment, hydrogen peroxide treatment and neutralisation treatment be able to independently carrying out in the space separately; Reaction can be carried out under safety, uniform airflow distributive condition, thereby make reaction more efficient, strengthen exhuast gas desulfurization denitration processing performance greatly.The 3rd problem that this solves for the present invention.
For achieving the above object, the technical scheme that the present invention takes is following:
A kind of marine exhaust desulphurization denitration processing method comprises filtration step, removes the dust in the marine diesel engine institute waste discharge gas; Ozone treatment step, the waste gas that finishes to dedusting sprays ozone; The hydrogen peroxide treatment step, the waste gas that finishes to ozone treatment sprays hydrogen peroxide; The neutralisation treatment step, the waste gas that finishes to hydrogen peroxide treatment sprays nertralizer; Dust removal step is removed contained fine solid particle in the waste gas that neutralisation treatment finishes.In above-mentioned neutralisation treatment step, use sodium-chloride water solution as nertralizer, with institute's sulfur-containing oxide and reaction of nitrogen oxides in the waste gas; Product-the neutral salt of this secondary response of reaction tank bottom deposition; Neutral salt reclaims through the comb that is arranged on reaction tank bottom.
The characteristics of desulphurization denitration facture are: in above-mentioned ozone treatment step, hydrogen peroxide treatment step and neutralisation treatment step, waste gas is reflected at separately independently and carries out in the space by flowing to 3 zones delimiting through porous plate successively; Or above-mentioned ozone treatment and hydrogen peroxide treatment step carry out in the same space, and neutralization reaction is carried out in another space.
As stated, this device is provided with filter on the marine diesel engine blast pipe after the prolongation; The reactive tank of handling waste gas is set between above-mentioned filter and deduster; The nertralizer spout that order is loaded onto the ozone spout that links to each other with the ozone supply pipe, the hydrogen peroxide spout that links to each other with the hydrogen peroxide supply pipe, linked to each other with the nertralizer supply pipe in above-mentioned reactive tank.Go up pertusate porous plate and be separated into 3 spaces to above-mentioned reactive tank inside, be respectively: first space, second space and the 3rd space.First interior volume top is provided with the ozone spout, and second interior volume top is provided with the hydrogen peroxide spout, and the 3rd interior volume top is provided with the nertralizer spout.Above-mentioned nertralizer feeder is the supply mean of sodium-chloride water solution, and bottom, the 3rd space is provided with the comb that has safety valve.
In other instances of the present invention, above-mentioned reactive tank is divided into first reactive tank and second reactive tank, each reactive tank links to each other with blast pipe.The top is provided with ozone spout and hydrogen peroxide spout in first reactive tank, establishes a plurality of porous plates with holes in second reactive tank and is separated out reaction compartment and distributes air-flow.The nertralizer spout is set above above-mentioned reaction compartment, and the bottom is provided with comb.Above-mentioned high-pressure water pipe connects Venturi scrubber (venturi scrubber) deduster.
Beneficial effect of the present invention is:
The nertralizer sodium chloride of marine exhaust is not only cheap, can from seawater, extract at any time, and also nontoxic, harmless.Different with nertralizer ammonia, do not need to go on board especially permission and loaded down with trivial details keeping program can fundamentally solve the adverse effect that ammonia causes crewman's life, health.
Produce the neutral salt of high additive value in the neutralization reaction process, this neutral salt is not to reclaim through deduster, but directly reclaims through the comb that is arranged on reaction tank bottom, and neutral salt does not mix with fine solid particle mutually.Under this state, improved the effect of recycling.Set up high-efficiency wet-type dust collector on this basis, in the exhuast gas desulfurization denitration, remove fine solid particle under the acting in conjunction, effect is remarkable.
Ozone treatment, hydrogen peroxide treatment and neutralisation treatment are carried out in the space that porous plate is separated out separately.Porous plate safety, distribute air-flow equably, with this understanding, the corresponding chemical reaction of various processes has more efficiency.Thus, the handling property of exhuast gas desulfurization denitration obtains essence and promotes, and can give play to bigger effect.
[description of drawings]
Fig. 1 is the flow chart of marine exhaust desulfurization denitration method of the present invention.
Fig. 2 is the sectional view of treating apparatus 10 in the first embodiment of the invention.
Fig. 3 is the sectional view of treating apparatus 10 in the second embodiment of the invention.
Fig. 5 is the sectional view of treating apparatus 10 in the third embodiment of the invention.
The part label that relates in the accompanying drawing is following:
1. reactive tank
2. blast pipe
3. porous plate
3a. hole
4. filter
5. ozone spout
6. hydrogen peroxide spout
7. nertralizer spout
8. deduster
9. comb
9a. comb safety valve
10. emission-control equipment
10a. the 1st space
10b. the 2nd space
10c. the 3rd space
11. ozone supply device
11a. ozone supply pipe
12. hydrogen peroxide feeder
12a. hydrogen peroxide supply pipe
13. nertralizer feeder
13a. nertralizer supply pipe
14. Venturi scrubber
15. high-pressure water pipe
16. the 1st reactive tank
17. the 2nd reactive tank
17a. reaction compartment
[specific embodiment]
How following reference accompanying drawing of the present invention reaches above-mentioned target if specifying.
Fig. 1 is the flow chart of marine exhaust desulfurization denitration method of the present invention.As shown in Figure 1, flow process comprises: filtration step S1, remove contained dust in the marine diesel engine combustion gas; Ozone treatment step S2, the waste gas that finishes to dedusting sprays ozone; Hydrogen peroxide treatment step S3, the waste gas that finishes to ozone treatment sprays hydrogen peroxide; Neutralisation treatment step S4, the waste gas that finishes to hydrogen peroxide treatment sprays nertralizer; And dust removal step S5, remove contained fine solid particle in the waste gas that neutralisation treatment finishes.
In above-mentioned filtration step S1,, remove contained corpuscular type material in the waste gas, like solid carbon, solid sulfur, oxycarbide etc. through being arranged on the filter in the blast pipe.Above-mentioned dust removal step S5 finally removes filtration step S1 fine solid particle that do not remove, behind desulphurization denitration.
Above-mentioned ozone treatment step is as the initial reaction step after the filtration step, and the waste gas in flowing into reactive tank sprays ozone.Sulfur-containing oxide SOx of institute and nitrogen oxide NOx and ozone play oxidation reaction in the waste gas, and concrete reaction equation is following:
SO
2+O
3→SO
3+O
2
NO+O
3→NO
2+O
2
2NO
2+O
3→O
2+N
2O
5↓
As stated, in the process of ozone treatment step S2, produce sediment N
2O
5In nitrogen oxide, N
2O
5Not only can not cause atmosphere pollution, and practical value is very high.Anhydrous nitrogen is deposited in reaction tank bottom, reclaims through the comb that is arranged on reaction tank bottom.
Through above-mentioned ozone treatment step S2, the waste gas spray concentration that finishes to oxidation is 10～30% hydrogen peroxide H
2O
2Dilution (hydrogen peroxide solution), the sulfur-containing oxide SO of institute in the waste gas
3With nitrogen oxide NO
2With hydrogen peroxide dilution reaction, this is the 2nd step with hydroperoxidation.Concrete reaction equation is following:
SO
3+H
2O
2→H
2SO
4
NO
2+H
2O
2→NHO
3+NHO
2
Through above-mentioned hydrogen peroxide treatment step S3, oxysulfide SO
3With nitrogen oxide NO
2Change into sulfuric acid H separately
2SO
4With nitric acid NHO
3The nitrous acid NHO that in this process, produces
2Be the acid of a very unsettled alkali, very easily with through ozone treatment step S2 residual oxygen molecule reaction, generate nitric acid.
Through after the above-mentioned hydrogen peroxide treatment step S3, will experience a most important ring-neutralisation treatment step S4 among the present invention, this is the 3rd step of the present invention.Hereinto with treatment step S4 in, use sodium chloride to replace the ammonia that all the time in the desulphurization denitration process, uses, working concentration is that 10～30% sodium chloride nacl aqueous solution are as the sulfur acid H of institute in nertralizer and the waste gas
2SO
4And nitric acid NHO
3Reaction, concrete reaction equation is following:
H
2SO
4+NaCl→HCl+NaHSO
4↓
HNO
3+NaCl→HCl+NaNO
3↓
HCl+NaCl+O
2→NaOH+Cl
2
At above-mentioned neutralisation treatment step S4, to compare with nertralizer ammonia, sodium chloride is cheap, can from seawater, extract at any time, and is nontoxic, can not produce adverse effect to human body.Best nertralizer when therefore it is the processing of marine exhaust desulphurization denitration.Moreover, identical during with ammonia react, can extraly obtain the neutral salt NaHSO of high additive value
4And NaNO
3
In above-mentioned neutralisation treatment step S4, the extra neutral salt that obtains is deposited in reaction tank bottom, reclaims through the comb that is arranged on reaction tank bottom.In the neutralization reaction process, generate hydrogen chloride HCl gas and fine solid particle, this fine solid particle will be absorbed and removal by deduster at dust removal step S5.
The neutral salt that in above-mentioned treatment step S4, generates is not to be absorbed by deduster with fine solid particle; But directly reclaim through the comb that is arranged on reaction tank bottom; Neutral salt is not mixed with fine solid particle, improved the comfort level and the efficient of recycling thus greatly.
Moreover because neutral salt reclaims by reactive tank in the S4 step, therefore at dust removal step S5 except using dry collector such as sack cleaner, also can use Venturi scrubber (venturi scrubber) high-efficiency wet-type dust collector.The disturbing factor when reclaiming neutral salt can be removed thus, contained hygroscopy in the waste gas (solid runs into the character of moisture dissolving) particle and fine solid particle can be removed simultaneously fully.
In above-mentioned nertralizer treatment step S4, obtain neutral salt as additional product.Wherein, niter cake NaHSO
4Can be used as the solvent of analyzing various chemical compositions, like platinum cleaning agent etc.Sodium nitrate NaNO
3Can be used as the raw material of common herbicide, medicine, chemicals and cultivate penicillin etc., of many uses.
As stated; The condition of the most suitable ozone treatment step S2 of marine exhaust desulphurization denitration facture, hydrogen peroxide treatment step S3 and neutralisation treatment S4 is: by the toxic emission direction reactive tank is set; The porous plate that distributes air-flow is set in reactive tank, is divided into 3 respective reaction spaces to the inside of reactive tank.Each reactions step S2, S3 and S4 independently carry out in 3 spaces that porous plate is separated out separately.
Carry out treatment step S2, S3 and S4 in the above described manner, in the space that porous plate is separated out, air-flow will flow into reactive tank under safety, uniform distributive condition.Thus, each reactions step S2, S3 and the corresponding chemical reaction of S4 are more efficient, and the handling property of exhuast gas desulfurization denitration is greatly improved.
Can separate without porous plate according to required when carrying out above-mentioned ozone treatment step S2 and hydrogen peroxide treatment step S3, but carry out at same reaction compartment.Most important neutralisation treatment step S4 carries out at another reaction compartment among the present invention.Each reactions step S2, S3 and S4 all are under the equal distribution of air flow condition, react smooth.
Below be the optimization process device allocation plan of marine exhaust desulphurization denitration facture of the present invention, specify with reference to figure 2～5.
Fig. 2 is the sectional view of the used treating apparatus 10 of first embodiment of the invention.On the marine diesel engine blast pipe 2 that prolongs, dust removal filter 4 and deduster 8 are set, reactive tank 1 are set between above-mentioned dust removal filter 4 and deduster 8 handle waste gas.Above-mentioned dust removal filter can use plain filter products such as fabric filter, adhesive-bonded fabric filter and active carbon filter, and above-mentioned deduster 8 can use dry collectors such as sack cleaner, electronic precipitator.
The nertralizer spout 7 that the order of carrying out according to reaction above in above-mentioned reactive tank 1 has set gradually the ozone spout 5 that links to each other with ozone supply pipe 11a and ozone supply device 11, the hydrogen peroxide spout 6 that links to each other with hydrogen peroxide supply pipe 12a and hydrogen peroxide feeder 12, linked to each other with nertralizer supply pipe 13a and nertralizer feeder 13.
Above-mentioned ozone supply device 11 main being responsible for are produced and ozone supply, can use the product of any kind, and 2 kinds of chassis type (Plate) and casts (Tube) are generally arranged.The principle of ozone supply device is: air is cleaned through filter after being compressed the machine compression.Process is arranged on after the discharge tube processing on the cooling-water duct, and airborne oxygen and current response are decomposed oxygen again and combined, thereby generate ozone.
In above-mentioned hydrogen peroxide feeder 12 and nertralizer feeder 13, storing concentration respectively is 10～30% hydrogen peroxide and sodium chloride dilution; Under the effect of not shown pump; Dilution passes through hydrogen peroxide supply pipe 12a and nertralizer supply pipe 13a respectively, from hydrogen peroxide spout 6 and 7 ejections of nertralizer spout.
The effect of porous plate is identical with above-mentioned neutralisation treatment step, is the important component part of emission-control equipment 10 of the present invention.There are a plurality of hole 3a to be used to distribute air-flow on the porous plate 3, at certain intervals form setting in above-mentioned reactive tank 1, the inner space of separating reactive tank.Thus, reactive tank is divided into the first space 10a, the second space 10b and the 3rd space 10c.
Above-mentioned porous plate 3 is the direction along reactive tank 1 in reactive tank 1 inside, and promptly airflow direction is endways is provided with 4.The first space 10a inner and upper that porous plate is separated out is provided with ozone spout 5, the second space 10b inner and upper and hydrogen peroxide spout 6, the three space 10c inner and upper is set nertralizer spout 7 is set.
According to diagram, each spout 5,6 and 7 is provided with 4 with same horizontal line respectively above respective reaction space 10a, 10b and 10c, in addition also can be according to the endways setting of the central point of reaction compartment 10a, 10b and 10c.Spout 5,6 and 7 quantity can be adjusted according to the capacity of reactive tank 1 and the quality of the waste gas of handling.
Under the condition of above-mentioned porous plate 3 and spout 5,6,7, ozone treatment, hydrogen peroxide treatment and neutralisation treatment are independently carried out in reaction compartment 10a, 10b and the 10c that porous plate 3 is separated out separately.Air-flow carries out chemical reaction under safety, uniform distributive condition, the required chemical reaction of each reactions step is more efficient.Thus, the handling property of exhuast gas desulfurization denitration is greatly improved.
Meanwhile, for reclaiming the sediment that generates in ozone reaction and the neutralization reaction process, promptly anhydrous nitrogen N
2O
5And neutral salt NaHSO
4And NaNO
3, below the first reaction compartment 10a, promptly below reactive tank 1 below, the 3rd reaction compartment 10c, promptly reactive tank 1 below is provided with comb 9 and the comb safety valve 9a with funnel function.
Generate the neutral salt of high additive value in the above-mentioned neutralisation treatment process; These neutral salt are not absorbed by deduster; But directly reclaim through the comb that is arranged on the 3rd reaction compartment 10c bottom, neutral salt does not mix with fine solid particle mutually, has improved the efficient of recycling thus greatly.
Fig. 3 is the sectional view of the used treating apparatus 10 of second embodiment of the invention, at preceding text particular content has been described, and its structure is identical with first embodiment substantially.Different is to be provided with Venturi scrubber 14.
Above-mentioned Venturi scrubber 14 is a kind of of dedusting device, makes gas after the neutralisation treatment can't help blast pipe and discharges, but flow into flow tube.Improve flow velocity in flow tube throat.Simultaneously, the water under high pressure in the throat (fresh water or seawater) separates the drop (particulate of water) and powder dust particle collision that forms.This catches the process of powder dust particle for drop.
Drop flows in not shown recovery separator-anticyclone device after catching powder dust particle, and air and drop separation also are purified.In this step, cleaned air passes flows out also from the outlet of anticyclone device top and finally enters atmosphere, and the water of having caught dust flows out from the outlet of anticyclone device below.This is the final purification step.
Above-mentioned Venturi scrubber 14 can be effective to remove pocket type and electronic precipitator can't be caught, and size is the hygroscopy powder dust particle of 1 μ m (micron).It is more efficient that this treating apparatus can make the desulphurization denitration processing and the dedusting of waste gas thus.
Can use the reason of above-mentioned Venturi scrubber 14 and so on wet scrubber to be, the neutral salt that produces in the neutralisation treatment process is reclaimed by comb 9 after being deposited in bottom, the 3rd space.The multiple high-efficiency wet-type dust collector of except that Venturi scrubber 14, removing fine solid particle in addition is available.
Figure 4
and
is the use of the processing apparatus 10 on a perforated plate 3.This strip has the hole 3a of certain thickness and certain intervals, can distribute off-gas flows safely, equably.Can select square, circular or other shapes for use according to the shape of reactive tank 1.
Most preferred scheme is: the direction according to reactive tank 1 is provided with several porous plates 3, and the position of empty 3a reaches consistent on the porous plate 3, can distribute off-gas flows safely, equably thus.
Fig. 5 is device 10 sectional views of third embodiment of the invention.Be divided into first reactive tank 16 and second reactive tank 17 to the reactive tank 1 among first embodiment and second embodiment.Each reactive tank 16,17 usefulness blast pipe 2 connects.Ozone spout 5 and hydrogen peroxide spout 6 are set above in first reactive tank 16.
Simultaneously, outlet in second reactive tank 17 and porch are provided with several (figure is last respectively to adorn 3) porous plates 3 at certain intervals, thereby mark off reaction compartment 17a in second reactive tank, 17 central authorities.In above-mentioned reaction compartment inner and upper nertralizer spout 7 is set, all the other facilities are identical with first embodiment and second embodiment.
In above-mentioned instance, do not establish porous plate 3 between ozone treatment and the hydrogen peroxide treatment, but in first reactive tank, carry out jointly.Most important neutralisation treatment is carried out in the reaction compartment 17a of second reactive tank 17 that porous plate 3 marks off in the exhaust-gas treatment.Also can obtain identical treatment effect thus.
In addition, be provided with deduster on second reactive tank, the 17 rear blast pipes 2 as shown in the figure.This deduster can be the dry collector 8 that uses among first embodiment, also can be the Venturi scrubber 14 that uses among second embodiment.For reclaiming neutral salt, below corresponding second reactive tank 17 of reaction compartment 17a, comb 9 is set.
Claims (7)
1. marine exhaust desulfurization denitration method comprises:
Filtration step (S1) is removed contained dust in the marine diesel engine combustion gas;
Ozone treatment step (S2), the waste gas that finishes to dedusting sprays ozone;
Hydrogen peroxide treatment step (S3), the waste gas that finishes to ozone treatment sprays hydrogen peroxide;
Neutralisation treatment step (S4), the waste gas that finishes to hydrogen peroxide treatment sprays nertralizer; And
Dust removal step (S5) is removed contained fine solid particle in the waste gas that neutralisation treatment finishes,
Wherein, in said neutralisation treatment step (S4), use the sodium chloride nacl aqueous solution as the sulfur acid H of institute in nertralizer and the waste gas
2SO
4Composition and nitric acid HNO
3Composition reaction is characterized in that: in said neutralisation treatment step (S4), and the neutral salt NaHSO that obtains through reaction
4, NaNO
3Be deposited in reaction tank bottom, reclaim through the comb that is arranged on reaction tank bottom.
2. marine exhaust desulfurization denitration method according to claim 1; It is characterized in that: the porous plate that distributes air-flow is set according to the toxic emission direction; Be divided into 3 reaction compartments to the inside of said reactive tank, ozone treatment step (S2), hydrogen peroxide treatment step (S3) and neutralisation treatment step (S4) are independently carried out in 3 spaces that porous plate is separated out separately.
3. marine exhaust desulfurization denitration method according to claim 1 is characterized in that: said ozone treatment step (S2) and hydrogen peroxide treatment step (S3) are carried out in same reaction compartment; In the reaction compartment that the porous plate that distributes air-flow is divided, carry out said neutralisation treatment step (S4).
4. marine exhaust desulphurization denitration treating apparatus, its emission-control equipment (10) mainly comprises: on the marine diesel engine blast pipe (2) that prolongs, dust removal filter (4) and deduster (8) are set; Reactive tank (1) is set between said dust removal filter (4) and deduster (8) handles waste gas; The ozone spout (5) that order setting links to each other with ozone supply device (11) in said reactive tank (1); The hydrogen peroxide spout (6) that links to each other with hydrogen peroxide feeder (12); And the nertralizer spout (7) that links to each other with nertralizer feeder (13),
There are a plurality of pores (3a) to be used to distribute air-flow on the porous plate (3), in said reactive tank (1), are separated into first space (10a), second space (10b) and the 3rd space (10c) to the inner space of reactive tank with form at interval,
First space (10a) inner and upper is provided with ozone spout (5), and second space (10b) inner and upper is provided with hydrogen peroxide spout (6), and the 3rd space (10c) inner and upper is provided with nertralizer spout (7),
It is characterized in that: said nertralizer feeder (13) is the feedway of the sodium chloride nacl aqueous solution, and the 3rd space (10c) bottom is provided with comb (9) and comb safety valve (9a).
5. marine exhaust desulphurization denitration treating apparatus according to claim 4 is characterized in that: said deduster (8) is linked to each other with Venturi scrubber (14) by high-pressure water pipe (15).
6. marine exhaust desulphurization denitration treating apparatus, its emission-control equipment (10) mainly comprises: on the marine diesel engine blast pipe (2) that prolongs, dust removal filter (4) and deduster (8) are set; Reactive tank (1) is set between said dust removal filter (4) and deduster (8) handles waste gas; The ozone spout (5) that order setting links to each other with ozone supply device (11) in said reactive tank (1); The hydrogen peroxide spout (6) that links to each other with hydrogen peroxide feeder (12); And the nertralizer spout (7) that links to each other with nertralizer feeder (13),
Said reactive tank (1) is divided into first reactive tank (16) and second reactive tank (17), and first, second reactive tank (16), (17) connect with blast pipe (2), and the top is provided with ozone spout (5) and hydrogen peroxide spout (6) in first reactive tank (16),
Central authorities are provided with and have the porous plate (3) of a plurality of holes (3a) in second reactive tank (17), thereby mark off reaction compartment (17a) in second reactive tank (17) central authorities, in said reaction compartment (17a) inner and upper nertralizer spout (7) are set,
It is characterized in that: said nertralizer feeder (13) is the feedway of the sodium chloride nacl aqueous solution, and second reaction compartment (17a) bottom of second reactive tank (17) is provided with comb (9) and comb safety valve (9a).
7. marine exhaust desulphurization denitration treating apparatus according to claim 6 is characterized in that: said deduster (8) is linked to each other with Venturi scrubber (14) by high-pressure water pipe (15).
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