CN108970349A - Boat diesel engine tail gas desulfurization denitrification integrated device and method - Google Patents
Boat diesel engine tail gas desulfurization denitrification integrated device and method Download PDFInfo
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- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
- B01D53/323—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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Abstract
Boat diesel engine tail gas desulfurization denitrification integrated device designed by the present invention, the tail gas input terminal of its tail gas cooler accesses diesel engine vent gas efferent duct, the cooling tail gas output end of tail gas cooler accesses low-temperature plasma generator, the exhaust gas oxidation area output end of low-temperature plasma generator accesses urea washes tower, the waste liquid output end of urea washes tower accesses scrub raffinate container, the first output end connection scrub raffinate pump of scrub raffinate container, the internal exchanger of the output end access tail gas cooler of scrub raffinate pump, internal exchanger output end access crystallization and separator, crystallization and separator output end access urea liquid container, the second output terminal of scrub raffinate container accesses urea liquid container, the urea washes liquid output end of urea liquid container accesses urea pump, the output end of urea pump accesses urea washes tower.The present invention has many advantages, such as that low energy consumption, low in cost, product is recyclable, without secondary pollution using exhaust gas desulfurization denitrification integral system.
Description
Technical field
The present invention relates to marine vessel exhaust emission control technique fields, and in particular to a kind of boat diesel engine tail gas desulfurization
Denitrification integrated device and method.
Technical background
With the fast development of global economy, global trade amount constantly increases, transport by sea as three big transportation systems it
The advantages that one, low with transportation cost, freight volume is big, highly-safe, carries 90% or more transport in global transportation
Task.Foreign-going ship generally uses two-stroke or four-cycle diesel as main propelling machinery, these boat diesel engines use honest and clean
The heavy oil of valence reduces navigation cost as fuel, and still, the tail gas of discharge also results in serious atmosphere pollution.Ship
The atmosphere pollution of diesel emission mainly includes particulate matter (PM), SOx, NOx, hydrocarbon (HC) etc..It is big in order to cope with
The severe situation of gas pollution effectively controls marine diesel tail gas (abbreviation ship tail gas) pollution, reduces ship atmosphere pollution
Discharge, International Maritime Organization (IMO), which has revised MARPOL73/78 pact supplemental provisions VI in 2008, " prevents ship from causing atmosphere
Pollution rule ", marine diesel tail gas NOx and SOx discharge are limited in supplemental provisions VI.
Purification for NOx and SOx in boat diesel engine emission mainly has be directed to two kinds of pollutants respectively at present
Post-processing technology carries out denitration using selective catalytic reduction (SCR), wet scrubbing carries out desulfurization.Therefore, to meet
The limitation of MARPOL pact needs to carry out desulphurization denitration respectively using two systems simultaneously on ship, after this will be caused
Manage the problems such as system footprint area is big, operating cost is high.
In order to make a set of equipment that can complete the desulphurization denitration of ship tail gas, (Yang Guohua, Hu Wenjia, the week such as Yang Guohua
Jiang Hua, wait ship tail gas ozone oxidation-Absorption by Sea Water desulphurization denitration new process study [J] internal combustion engine journal, 2008,26
(3): 278-282. it) proposes to realize ship tail gas desulfurization and denitrification integral using ozone oxidation combination seawer washing, the technique
The NO in tail gas is oxidized to NO using ozone2, then utilize the SO in seawater wet scrubbing removing tail gas2And NO, to complete
The desulphurization denitration of ship tail gas.But there are two problems to be solved for the technique: first is that ozone generator power consumption is high, volume
Greatly, expensive；Second is that ozone is to SO in exhaust gas2Oxidation efficiency is low, can there is a large amount of SO after seawer washing in waste liquid3 2-, need
Additional quality recovery system, equipment volume are huge.
To solve the above-mentioned problems, analogy text alkene of Wuhan Textile University et al. (explain literary alkene plasma desulfuration denitration and its
For research [D] Wuhan Textile University of boat diesel engine vent gas treatment, 2013.) put forward plasma oxidation combination seawater
It washs to realize boat diesel engine tail gas desulfurization denitrification integral, which sprays into seawater first in exhaust pipe reduces diesel engine
Exhaust temperature, while the content of vapor in tail gas is improved, then pass through plasma generator for SOx and NOx oxygen in tail gas
Metaplasia completes the desulphurization denitration of tail gas finally by seawer washing tower at sulfuric acid and nitric acid.The technique is compared to ozone oxidation knot
Seawater scrubbing FGD process is closed, has many advantages, such as that low energy consumption, small in size, cheap (Yu Qi, remaining rigid one kind are used for marine vessel exhaust
The method of integration desulfurization denitration:, CN101972605A [P] .2011.), and low temperature plasma is to SO2There is good oxygen
Change effect, does not need additional seawater quality recovery system, reduce the occupied area of whole system.But there are three for this method
Problem: first is that being injected directly into the etching problem of exhaust pipe caused by seawater and plasma generator electrode in exhaust pipe；
Second is that seawater method washing belongs to open loop type flue gas scrubbing technology, applies and be restricted at certain harbours and emission control area；Three
It is the desulphurization denitration for carrying out ship tail gas using seawer washing, actually gives pollution transfer of the diesel engine vent gas to atmosphere
Ocean, influence of the desulfurization waste liquor to marine environment need to be investigated.
Summary of the invention
Present invention aim to provide a kind of boat diesel engine tail gas desulfurization denitrification integrated device and method, this is
System and method do not reduce delivery temperature by the way of spraying into seawater in exhaust pipe, avoid introducing that seawater is possible to be set
Standby etching problem, and do not use seawater method to wash, scrub raffinate is not to ocean disposal, and product is recyclable, to make the ship
Oceangoing ship diesel engine vent gas desulfurization and denitrification integral method is more environmentally protective.
In order to achieve this, a kind of boat diesel engine tail gas desulfurization denitrification integrated device designed by the present invention, special
Sign is: it includes tail gas cooler, low-temperature plasma generator, urea washes tower, scrub raffinate container, urea liquid appearance
Device, urea pump, scrub raffinate pump and crystallization and separator, wherein the tail gas input terminal of tail gas cooler is for connecting diesel oil
The exhaust gas oxidation area of the tail gas efferent duct of machine, the cooling tail gas output end connection low-temperature plasma generator of tail gas cooler is defeated
Enter end, the tail gas input terminal of the exhaust gas oxidation area output end connection urea washes tower of low-temperature plasma generator, urea washes
The input terminal of the waste liquid output end connection scrub raffinate container of tower, the first output end connection scrub raffinate pump of scrub raffinate container
Input terminal, scrub raffinate pump output end connection tail gas cooler internal exchanger input terminal, the inside of tail gas cooler
Waste liquid output end connects after the waste liquid input terminal of heat exchanger output end connection crystallization and separator, crystallization and the processing of separator
Waste liquid input terminal after the processing of chamber pot element solution container, the second output terminal connection urea liquid container of scrub raffinate container are washed
Wash waste liquid input terminal, the input terminal of the urea washes liquid output end connection urea pump of urea liquid container, the output end of urea pump
Connect the urea washes liquid input terminal of urea washes tower, the urine of the packing area upper end nozzle connection urea washes tower of urea washes tower
The top of plain cleaning solution input terminal, urea washes tower has scrubbing tower tail gas outlet side.
A kind of boat diesel engine tail gas desulfurization method of denitration of above-mentioned apparatus, it includes the following steps:
Step 1: diesel engine vent gas enters tail gas cooler, and the scrub raffinate after desulphurization denitration is pumped into tail by scrub raffinate pump
The internal exchanger of gas cooler, diesel engine vent gas are contacted with the internal exchanger of tail gas cooler, the heat in diesel engine vent gas
Amount is desulfurized the scrub raffinate after denitration and absorbs, and diesel engine vent gas temperature reduces, meanwhile, scrub raffinate after desulphurization denitration is by the
Primary heating concentration；
Step 2: the diesel engine vent gas after tail gas cooler reduces temperature introduces low-temperature plasma generator, diesel engine
For tail gas after low-temperature plasma generator, NOx and SOx in diesel engine vent gas are oxidized to H soluble easily in water2SO4、
HNO3、SO3And NO2；
Step 3: the diesel engine vent gas after low-temperature plasma generator will be oxidized introduces urea washes tower, is washed by urea
The urea wet scrubbing area for washing tower, urea concentration regulating system, scrub raffinate container, urea liquid container and urea pump composition makes
H in diesel engine vent gas2SO4、SO3、HNO3、NO2It is converted into (NH4)2SO4、N2；
Step 4: diesel engine vent gas passes through urea washes tower, and the nitrogen oxides and oxysulfide in diesel engine vent gas are taken off
It removes, the diesel engine vent gas after removing nitrogen oxides and oxysulfide is directly by the scrubbing tower tail gas outlet side at urea washes tower top end
Discharge；
Step 5: after the urea washes liquid of urea washes tower absorbs nitrogen oxides and oxysulfide in diesel engine vent gas, shape
At scrub raffinate, scrub raffinate pumps by scrub raffinate, is introduced into the internal exchanger of tail gas cooler, passes through internal exchanger
Heat exchange is carried out with diesel engine vent gas, then the scrub raffinate after desulphurization denitration is being crystallized and separated by heating concentration for the first time
Scrub raffinate is further concentrated in device, and the ammonia sulfate crystal of formation is separated, and can be used as nitrogenous fertilizer recycling.
Above-mentioned technical proposal with Wuhan Textile University using penetrating seawater to tail gas humidifying cooling by the way of compared with, we
Method avoids seawater using heat exchanger cooling and contacts caused etching problem with low-temperature plasma generator electrode；
Compared with the seawater scrubbing FGD process in background technique, the urea wet scrubbing that this method uses has above-mentioned technical proposal
The advantages that low in energy consumption, small in size, without secondary pollution, product can be recycled.Seawater scrubbing FGD process belongs to open cycle system, it utilizes seawater
Natural weak alkali absorbs the SOx and NOx in exhaust gas, is directly discharged into sea after waste liquid simple process, is equivalent to tail gas to big
The pollution transfer of gas has given ocean.And the urea wet scrubbing that this method uses belongs to closed-loop system, it is not useless to ocean disposal
Liquid, it is without secondary pollution, and product belongs to nitrogenous fertilizer for ammonium sulfate and can be recycled.And seawater scrubbing FGD process is during scrubbing exhaust gas,
Need to consume a large amount of seawater, pump power is higher relative to closed-loop system.To handle 25MW diesel engine vent gas desulfuration efficiency
For 98%, seawater method pump power is about 296kW, the pump power of closed-loop system be about 154kW, and open loop type system
Scrubbing tower size is big by 16% or so relative to closed loop co-volume.
This method is using exhaust gas desulfurization denitrification integral system with low energy consumption, small in size, low in cost, product can return
The advantages that receiving, be without secondary pollution.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Wherein, 1-tail gas cooler, 2-low-temperature plasma generators, 3-urea washes towers, on 3.1-packing areas
Hold nozzle, 3.2-scrubbing tower tail gas outlet sides, 3.3-urea washes wastes, 3.4-tail gas input areas, 4-urea concentrations
Regulating system, 5-scrub raffinate containers, 6-urea liquid containers, 7-packing areas, 8-urea pumps, 9-scrub raffinates pump,
10-crystallizations and separator.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
The present invention is composed in series by three tail gas heat exchange cooling, low temperature plasma oxidation and urea wet scrubbing steps,
Correspondingly, ship tail gas desulfurization and denitrification integral system provided by the invention can be divided into tail gas heat exchange cooling area, low temperature etc.
Gas ions zoneofoxidation and three, urea wet scrubbing area part.
A kind of boat diesel engine tail gas desulfurization denitrification integrated device that the present invention designs, as shown in Figure 1, it includes tail gas
Cooler 1, low-temperature plasma generator 2, urea washes tower 3, scrub raffinate container 5, urea liquid container 6, urea pump 8,
Scrub raffinate pump 9 and crystallization and separator 10, wherein the tail gas input terminal of tail gas cooler 1 is used to connect the tail of diesel engine
Gas efferent duct, the exhaust gas oxidation area input of the cooling tail gas output end connection low-temperature plasma generator 2 of tail gas cooler 1
End, the tail gas input terminal of the exhaust gas oxidation area output end connection urea washes tower 3 of low-temperature plasma generator 2, urea washes
The first output end connection washing of the input terminal of the waste liquid output end connection scrub raffinate container 5 of tower 3, scrub raffinate container 5 is useless
The input terminal of liquid pump 9, the internal exchanger input terminal of the output end connection tail gas cooler 1 of scrub raffinate pump 9, tail gas cooler
1 internal exchanger output end connection crystallization and the waste liquid input terminal of separator 10, after crystallization and the processing of separator 10
Waste liquid input terminal after the processing of waste liquid output end connection urea liquid container 6, the second output terminal of scrub raffinate container 5 connect urine
The scrub raffinate input terminal of plain solution container 6, the input of the urea washes liquid output end connection urea pump 8 of urea liquid container 6
End, the urea washes liquid input terminal of the output end connection urea washes tower 3 of urea pump 8, the packing area upper end spray of urea washes tower 3
Mouth 3.1 connects the urea washes liquid input terminal of urea washes tower 3, and the top of urea washes tower 3 has scrubbing tower tail gas outlet side
3.2。
In above-mentioned technical proposal, it further includes urea concentration regulating system 4, the urea of the urea concentration regulating system 4
The urea that output end connects urea liquid container 6 fills end.Urea concentration regulating system 4 is for adjusting in urea liquid container 6
Urea concentration, urea concentration range preferably 5%~10%.
In above-mentioned technical proposal, the crystallization and separator 10 also have solid ammonium sulfate outlet side.
In above-mentioned technical proposal, metal Pall ring filler is arranged in the packing area of the urea washes tower 3.Pall ring is due to ring
Wall aperture substantially increases the utilization rate of space and ring inner surface in ring, and gas-flow resistance is small, and liquid distribution is uniform.With flux
Greatly, the advantages that resistance is small, separative efficiency is high and operating flexibility is big, under identical decompression, treating capacity can be big compared with Raschig ring by 50%
More than.Compared with Raschig ring, this filler has the characteristics that production capacity is big, resistance is strong, operating flexibility is big, under normal circumstances
Pressure drop ratio Raschig ring 50%-70% when than Raschig ring 50%-100%, equally processing, the gas of Pall ring are handled when same pressure drop
Body flux can increase by 50% or more, and mass transfer apparatus efficiency improves 30% or so.
In above-mentioned technical proposal, the packing area 7 of the urea washes tower 3 is located at packing area upper end nozzle 3.1 and washes with urea
It washs between the tail gas input terminal of tower 3.The scrubbing tower tail gas outlet side 3.2 is located at 3.1 top of packing area upper end nozzle, the urine
The bottom of plain scrubbing tower 3 is urea washes waste 3.3, defeated for tail gas between the urea washes waste 3.3 and packing area 7
Enter area 3.4, the waste liquid output end of the urea washes tower 3 is connected to urea washes waste 3.3.Filler, urine is arranged in scrubbing tower
Plain cleaning solution passes through nozzle, sprays the pollution on filler, in order to increase the contact area of urea washes liquid and tail gas, in tail gas
Object is absorbed by packing area, completes the purification of tail gas.After urea liquid absorbs pollutant, scrub raffinate is just formed, is flowed to
The height of tower bottom waste, waste liquid is higher than waste liquid outlet, in order to there is the effect of fluid-tight, prevents tail gas from waste liquid outlet
Leakage.
In above-mentioned technical proposal, the low-temperature plasma generator 2 by dielectric barrier discharge reactor group at.Medium resistance
Discharge reactor is kept off compared with corona discharge, electric discharge uniformly, aoxidizes NO and SO2Effect is good, low energy consumption.
A kind of boat diesel engine tail gas desulfurization method of denitration of above-mentioned apparatus, it includes the following steps:
Step 1: diesel engine vent gas enters tail gas cooler 1, and scrub raffinate pumps 9 for the scrub raffinate (40 after desulphurization denitration
~50 DEG C) it is pumped into the internal exchanger of tail gas cooler 1, the inside of diesel engine vent gas (200~400 DEG C) and tail gas cooler 1
Heat exchanger contacts, and the heat in diesel engine vent gas is desulfurized the absorption of the scrub raffinate after denitration, and diesel engine vent gas temperature reduces (drop
As low as 200 DEG C or less), meanwhile, the scrub raffinate after desulphurization denitration is by heating concentration for the first time；
Step 2: the diesel engine vent gas after tail gas cooler 1 reduces temperature introduces low-temperature plasma generator 2, low temperature
The plasma oxidation area that plasma generator 2 forms can generate a large amount of O, HO2, oxidative free radicals and the bavin such as OH
Following chemical reaction occurs for oil machine tail gas:
e+H2O→OH+H+e (3)
O(1D)+H2O→2OH (4)
OH+O3→HO2+O2 (5)
N2O+O3→2NO2 (6)
N2O+O3→2NO2 (7)
NO+O3→NO2+O2 (8)
OH+NO→HNO2 (9)
HO2+NO→NO2+OH (10)
NO2+OH+M→HNO3+M (11)
SO2+O+M→SO3+M (12)
SO3+OH+M→HSO3+M (13)
HSO3+OH→H2SO4 (14)
SO3+H2O→H2SO4 (15)
M is middle element in above-mentioned chemical equation,Indicate a kind of excitation state of ozone；Indicate oxygen
The excitation state of molecule, I (3P) and O (1D the different excitation state of oxygen atom) are respectively indicated.
By above-mentioned chemical reaction, diesel engine vent gas is after low-temperature plasma generator 2, in diesel engine vent gas
NOx and SOx is oxidized to H soluble easily in water2SO4、HNO3、SO3And NO2；
Step 3: the diesel engine vent gas after low-temperature plasma generator 2 will be oxidized introduces urea washes tower 3, by urea
The urea wet process that scrubbing tower 3, urea concentration regulating system 4, scrub raffinate container 5, urea liquid container 6 and urea pump 8 form
Scrubbing section makes H in diesel engine vent gas2SO4、SO3、HNO3、NO2It is converted into (NH4)2SO4、N2；
Chemical reaction 16~35 carries out in scrubbing tower below, packing area of the main absorption process in scrubbing tower；
It is specific that following chemical reaction occurs:
SO3(l)+H2O(l)→H2SO4 (18)
(NH2)2CO+H2O→NH2COONH4 (19)
2NO+O2→2NO2 (24)
2HNO2+NH2CONH2→2N2+CO2+3H2O (32)
HNO2+NH2CONH2→2N2+HNCO+2H2O (33)
HNO2+HNCO→N2+CO2+H2O (34)
HNO3+5(NO2)2CO→8N2+5CO2+13H2O (35)
Step 4: diesel engine vent gas passes through urea washes tower 3, and the nitrogen oxides and oxysulfide in diesel engine vent gas are taken off
It removes, the diesel engine vent gas after removing nitrogen oxides and oxysulfide is directly discharged by the scrubbing tower tail gas on 3 top of urea washes tower
3.2 discharge of end；
Step 5: after the urea washes liquid of urea washes tower 3 absorbs nitrogen oxides and oxysulfide in diesel engine vent gas,
Scrub raffinate is formed, scrub raffinate is introduced into the internal exchanger of tail gas cooler 1, changes by inside by scrub raffinate pump 9
Hot device and diesel engine vent gas (200~400 DEG C of exhaust temperature, by dropping to 200 DEG C or less after cooler) carry out heat exchange, take off
Scrub raffinate after sulphur denitration is by heating concentration for the first time；
Step 6: the scrub raffinate of first time heating concentration is introduced crystallization and separator 10, tail gas by tail gas cooler 1
Cooler 1 carries out the scrub raffinate of first time heating concentration to be further concentrated by evaporation the (NH made in waste liquid4)2SO4Crystallization produces
Object can be used as nitrogenous fertilizer recycling.
In above-mentioned technical proposal, scrub raffinate container 5 is used to accommodate scrub raffinate, if ammonium sulfate concentrations reach in waste liquid
A certain concentration is just sent to heat exchanger 1 by waste drains pump 9 and heats, then Crystallization Separation ammonium sulfate；Otherwise it continues to be transported to urea and wash
Liquid case 6 is washed, continues to be pumped into scrubbing tower absorption tail gas by urea pump 8 after adjusting urea concentration, so recycle.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (9)
1. a kind of boat diesel engine tail gas desulfurization denitrification integrated device, it is characterised in that: it includes tail gas cooler (1), low
Isothermal plasma generator (2), urea washes tower (3), scrub raffinate container (5), urea liquid container (6), urea pump (8),
Scrub raffinate pumps (9) and crystallization and separator (10), wherein the tail gas input terminal of tail gas cooler (1) is for connecting diesel oil
The tail gas efferent duct of machine, the tail gas oxygen of cooling tail gas output end connection low-temperature plasma generator (2) of tail gas cooler (1)
Change area's input terminal, the tail gas input of exhaust gas oxidation area output end connection urea washes tower (3) of low-temperature plasma generator (2)
End, the input terminal of waste liquid output end connection scrub raffinate container (5) of urea washes tower (3), the first of scrub raffinate container (5)
Output end connects the input terminal of scrub raffinate pump (9), and scrub raffinate pumps the inside of output end connection tail gas cooler (1) of (9)
Heat exchanger input terminal, the internal exchanger output end connection crystallization of tail gas cooler (1) and the waste liquid input of separator (10)
Waste liquid input terminal after the processing of waste liquid output end connection urea liquid container (6) after end, crystallization and the processing of separator (10),
The scrub raffinate input terminal of second output terminal connection urea liquid container (6) of scrub raffinate container (5), urea liquid container
(6) output end of the input terminal of urea washes liquid output end connection urea pump (8), urea pump (8) connects urea washes tower (3)
Urea washes liquid input terminal, urea washes tower (3) packing area upper end nozzle (3.1) connection urea washes tower (3) urea
The top of cleaning solution input terminal, urea washes tower (3) has scrubbing tower tail gas outlet side (3.2).
2. boat diesel engine tail gas desulfurization denitrification integrated device according to claim 1, it is characterised in that: it further includes
Urea concentration regulating system (4), urea output end connection urea liquid container (6) of the urea concentration regulating system (4)
Urea fills end.
3. boat diesel engine tail gas desulfurization denitrification integrated device according to claim 1, it is characterised in that: the crystallization
And separator (10) also has solid ammonium sulfate outlet side.
4. boat diesel engine tail gas desulfurization denitrification integrated device according to claim 1, it is characterised in that: the urea
Metal Pall ring filler is arranged in the packing area of scrubbing tower (3).
5. boat diesel engine tail gas desulfurization denitrification integrated device according to claim 1, it is characterised in that: the urea
The packing area (7) of scrubbing tower (3) is located between packing area upper end nozzle (3.1) and the tail gas input terminal of urea washes tower (3).
6. boat diesel engine tail gas desulfurization denitrification integrated device according to claim 5, it is characterised in that: the washing
Tower tail gas outlet side (3.2) is located above packing area upper end nozzle (3.1), and the bottom of the urea washes tower (3) is washed for urea
It washs waste (3.3), is tail gas input area (3.4), the urine between the urea washes waste (3.3) and packing area (7)
The waste liquid output end of plain scrubbing tower (3) is connected to urea washes waste (3.3).
7. boat diesel engine tail gas desulfurization denitrification integrated device according to claim 1, it is characterised in that: the low temperature
Plasma generator (2) by dielectric barrier discharge reactor group at.
8. a kind of boat diesel engine tail gas desulfurization method of denitration of claim 1 described device, which is characterized in that it includes as follows
Step:
Step 1: diesel engine vent gas enters tail gas cooler (1), and the scrub raffinate after desulphurization denitration is pumped by scrub raffinate pump (9)
The internal exchanger of tail gas cooler (1), diesel engine vent gas are contacted with the internal exchanger of tail gas cooler (1), diesel oil tail
Heat in gas is desulfurized the absorption of the scrub raffinate after denitration, and diesel engine vent gas temperature reduces, meanwhile, the washing after desulphurization denitration
Waste liquid is by heating concentration for the first time；
Step 2: the diesel engine vent gas after tail gas cooler (1) reduces temperature introduces low-temperature plasma generator (2), diesel oil
After low-temperature plasma generator (2), NOx and SOx in diesel engine vent gas are oxidized to soluble easily in water tail gas
H2SO4、HNO3、SO3And NO2；
Step 3: the diesel engine vent gas after low-temperature plasma generator (2) will be oxidized introduces urea washes tower (3), by urea
Scrubbing tower (3), urea concentration regulating system (4), scrub raffinate container (5), urea liquid container (6) and urea pump (8) composition
Urea wet scrubbing area make H in diesel engine vent gas2SO4、SO3、HNO3、NO2It is converted into (NH4)2SO4、N2；
Step 4: diesel engine vent gas passes through urea washes tower (3), and the nitrogen oxides and oxysulfide in diesel engine vent gas are removed,
Diesel engine vent gas after removing nitrogen oxides and oxysulfide is directly by the scrubbing tower tail gas outlet side on urea washes tower (3) top
(3.2) it is discharged；
Step 5: after the urea washes liquid of urea washes tower (3) absorbs nitrogen oxides and oxysulfide in diesel engine vent gas, shape
At scrub raffinate, scrub raffinate is introduced into the internal exchanger of tail gas cooler (1), passes through inside by scrub raffinate pump (9)
Heat exchanger and diesel engine vent gas carry out heat exchange, and the scrub raffinate after desulphurization denitration is by heating concentration for the first time.
9. boat diesel engine tail gas desulfurization method of denitration according to claim 8, it is characterised in that: it further includes step 6:
The scrub raffinate of first time heating concentration is introduced crystallization and separator (10) by tail gas cooler (1), and tail gas cooler (1) will
The scrub raffinate of heating concentration for the first time carries out further being concentrated by evaporation the (NH made in waste liquid4)2SO4Crystallization.
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