CN107754607B - Comprehensive treatment method and device for exhaust gas of marine diesel engine - Google Patents
Comprehensive treatment method and device for exhaust gas of marine diesel engine Download PDFInfo
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- CN107754607B CN107754607B CN201711122478.1A CN201711122478A CN107754607B CN 107754607 B CN107754607 B CN 107754607B CN 201711122478 A CN201711122478 A CN 201711122478A CN 107754607 B CN107754607 B CN 107754607B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D—SEPARATION
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- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B01D2251/00—Reactants
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- B01D2251/306—Alkali metal compounds of potassium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
Abstract
The invention discloses a comprehensive treatment method and a comprehensive treatment device for exhaust gas of a marine diesel engine. The invention adopts the oxidation absorption mode of oxidant aerial fog and alkali liquor aerial fog to form NO3 ‑、SO4 2‑Aerosol particles are removed by using a high-voltage electrostatic dust removal device, and desulfurization, denitrification and dust removal can be simultaneously carried out in a set of device; the device can respectively work in a desulfurization dust removal mode and a desulfurization and denitrification dust removal mode according to different navigation areas; the technical system has high integration level, flexible and convenient operation and higher reliability.
Description
Technical Field
The invention relates to the field of atmospheric pollution control and ship tail gas emission control, in particular to a comprehensive treatment method and device for exhaust gas of a ship diesel engine.
Background
With the rapid development of global economy, the global trade volume is continuously increased, ocean transportation is taken as one of three transportation systems, the ocean transportation has the advantages of low transportation cost, large transportation volume, high safety and the like, and more than 90 percent of transportation tasks are carried out in global goods transportation. However, the emission of exhaust gas from marine diesel engines is aggravating the deterioration of global environment, and is attracting much attention. It is statistical that marine diesel exhaust accounts for around 9% of the emitted pollutants worldwide, and even up to 30-40% in local areas of harbor dense cities. Annual emission of NO to atmosphere by global marine diesel enginesxAbout 1000 million tons, SOxAbout 850 million tons, and the polluted ocean atmosphere can spread to areas beyond 1000 kilometers, causing serious impact on the global environment. At present, most of marine diesel engines adopt a marine low-speed two-stroke diesel engine, and pollutants in exhaust gas of the marine diesel engine mainly comprise Nitrogen Oxides (NO)x) Sulfur Oxide (SO)x) Particulate Matter (PM), Hydrocarbons (HC), nitric oxide (CO), Volatile Organic Compounds (VOC), and the like.
NO in marine diesel exhaust gasxAnd SOxNot only can cause severe weather such as acid rain, photochemical smog and the like, but also can generate great threat to human health, and various mandatory laws and regulations are made and implemented along with the increase of environmental awareness of people. The International Maritime Organization (IMO) firstly proposed a convention VI of "MARPOL 73/78 antipollution convention", the main content of which is to prevent the atmospheric pollution caused by ships. The international maritime organization for the protection of Marine Environments (MEPC) has established sulfur oxide emission control areas (SECA) and nitrogen oxide emission control areas (NECA) in major waters around the world, wherein SECA primarily includes the baltic sea area, the north sea area (including the english isthmus), the north american sea area, the U.S. caribbean area, and NECA primarily includes the north american area and the U.S. caribbean area. For sulfur emission limits, IMO is specified from 202The sulfur content mass fraction of fuel oil added to the ship in the global range from 1 month to 1 day of 0 year does not exceed 0.5%, and the sulfur content mass fraction of fuel oil added to the ship in the SECA region from 1 month to 1 day of 2015 does not exceed 0.1%. Ships sailing in the NECA region are required to satisfy NOxThe emission limit specifies that the diesel engine installed after 1 month and 1 day of 2016 execute the Tier III emission standard, which is approximately 20% of Tier I, and the low-speed engine (n < 130r/min) NOxThe discharge amount is less than 3.4 g/kWh; high speed machine (n > 2000r/min) NOxThe discharge amount is less than 2.0 g/kWh; medium speed machine (130 < n < 2000r/min) NOxThe discharge amount is less than 9 n-0.2g/kWh. Increasingly stringent emission regulations have promoted the development of ship exhaust emission reduction products worldwide.
As the space of the ship is limited, the huge desulfurization, denitrification and dust removal equipment on land is difficult to be directly applied to the ship. A reasonable ship exhaust gas treatment system must be designed according to the characteristics of a ship and the exhaust gas generation principle. Therefore, a large number of ship waste gas treatment researches are carried out by scientific research institutes at home and abroad, various ship waste gas pollutant control technologies are provided, and a plurality of technologies about ship waste gas purification are developed: the method of combining EGR (exhaust gas recirculation) denitration and wet desulphurization for exhaust gas treatment can reduce NO in the exhaust gas to a certain degreexAnd SO2Content (c); but two different systems are needed to complete waste gas treatment, the volume of the device is increased, in addition, the EGR technology is difficult to meet the requirement of Tier III emission, and NO can not be thoroughly solvedxEmission reduction problem; the method adopts alkali liquor as washing liquid, simultaneously removes sulfur oxides and particles in the ship waste gas, the desulfurization effect can meet the limit value of emission regulations, but only particles with larger diameters can be removed, the removal effect on micron-sized and nano-sized particles which harm the most is not good, and meanwhile, a narrow cabin is more crowded due to a huge washing tower and complex piping; the method of filtering dust removal, zeolite denitrification and desulfurization and seawater washing is adopted for comprehensive treatment of the ship exhaust gas, the volume of a reaction system is increased by the three reaction devices, and the problems of slow reaction rate, low denitrification efficiency and the like exist in the denitrification of the reduction technology, so that the method is not beneficial to popularization and application of the technology.
Disclosure of Invention
In view of the above-mentioned technical problems, a method and an apparatus for comprehensive treatment of exhaust gas from marine diesel engines are provided. The technical means adopted by the invention are as follows:
the comprehensive exhaust gas treating process for marine diesel engine includes the following steps:
s1, passing the exhaust gas of the marine diesel engine through alkali liquor aerial fog or sequentially passing through oxidant aerial fog and alkali liquor aerial fog;
and S2, removing the particulate matters in the exhaust gas obtained in the step S1 through a high-voltage electrostatic dust removal device, and then discharging the exhaust gas into the atmosphere.
In the step S1, the exhaust gas of the marine diesel engine passes through the alkali liquor aerial fog, the alkali liquor aerial fog and SO in the exhaust gas of the marine diesel enginexFast reaction to form SO-containing3 2-、SO4 2-Exhaust of aerosol particles.
In step S1, the exhaust gas of the marine diesel engine sequentially passes through the oxidant gas mist and the alkali liquor gas mist, the oxidant gas mist and NO and SO in the exhaust gas of the marine diesel engine2Fast reaction to form NO-containing3 -、SO4 2-Aerosol particles and high NOxContaining NO3 -、SO4 2-Aerosol particles and high NOxThe waste gas passes through the alkali liquor aerial fog, and the alkali liquor aerial fog continuously absorbs NO3 -、SO4 2-Aerosol particles and high NOxHigh valence NO in exhaust gas of (2)x、SOxForm a gas containing SO4 2-、NO3 -Exhaust of aerosol particles.
The oxidant aerial fog and the alkali liquor aerial fog are positioned in a flue or a reactor.
The atomization modes of the oxidant aerosol and the alkali liquor aerosol are compressed air atomization, spray atomization or ultrasonic atomization;
the particle diameters of the oxidant aerial fog and the alkali liquor aerial fog are 1-100 mu m.
The oxidant in the oxidant aerosol is one or a mixture of several solutions of sodium chlorite, sodium hypochlorite, hydrogen peroxide, potassium permanganate, sodium chlorate, calcium hypochlorite, sodium persulfate and electrolyzed seawater; the pH value of the oxidant in the oxidant gas fog is 2-13.
The alkali liquor in the alkali liquor aerosol is one solution or a mixture of several solutions of sodium hydroxide, magnesium hydroxide, calcium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate and seawater.
The high-voltage electrostatic dust removal device is a wet high-voltage electrostatic dust removal device.
According to NO in exhaust gas of marine diesel enginex、SO2The concentration of the oxidant in the oxidant gas mist and the alkali liquor in the alkali liquor gas mist and the atomization amount of the oxidant gas mist and the alkali liquor gas mist can be adjusted.
By the comprehensive treatment method for the exhaust gas of the marine diesel engine, NO in the exhaust gas of the marine diesel enginexThe removal rate of (1) is more than 85 percent, and SOxThe removal rate is more than 95 percent, and the removal rate of particulate matters is more than 80 percent.
The invention also discloses a comprehensive treatment device for the waste gas of the marine diesel engine, which comprises a main waste gas flue, a bypass flue I, a bypass flue II, a stop valve I, a stop valve II, a stop valve III, a stop valve IV, an oxidant gas mist area, an alkali liquor gas mist area, a high-voltage electrostatic dust collection device, an atomization device I, an atomization device II, a pump I, a pump II, a liquid storage cabinet, a three-way valve and a sludge cabinet;
one end of the waste gas main flue is communicated with the smoke outlet of the diesel engine, a hole I communicated with the bypass flue I is formed in the side wall of the waste gas main flue, and a hole II communicated with the bypass flue II is formed in the side wall of the pipe section of the waste gas main flue between the smoke outlet of the waste gas main flue and the hole I;
the other end of the bypass flue I is communicated with the lower part of the side wall of the high-voltage electrostatic dust removal device, the oxidant gas mist area and the alkali liquid gas mist area are arranged in the bypass flue I, the holes I are communicated with the high-voltage electrostatic dust removal device sequentially through the oxidant gas mist area and the alkali liquid gas mist area, the atomizing device I is arranged at the bottom of the oxidant gas mist area, the gas mist nozzle of the atomizing device I faces upwards, the oxidant injection pipe is arranged on the atomizing device I, the atomizing device II is arranged at the bottom of the alkali liquid gas mist area, the gas mist nozzle of the atomizing device II faces upwards, and the alkali liquid injection pipe is arranged on the atomizing device II;
the high-voltage electrostatic dust removal device is internally provided with an electrostatic dust removal area, a cathode electrode and an anode plate are arranged in the electrostatic dust removal area, the cathode electrode is connected with the cathode output end of a high-voltage power supply, the anode plate is connected with the ground wire of the high-voltage power supply, the bottom end of the high-voltage electrostatic dust removal device is communicated with the sludge cabinet through the pump I, a spraying device is arranged above the electrostatic dust removal area, the upper end of the anode plate is provided with a liquid inlet pipe, the liquid storage cabinet is communicated with the three-way valve through the pump II, and the three-way valve is respectively communicated with the spraying device and the liquid inlet pipe;
the other end of the bypass flue II is communicated with the top end of the high-voltage electrostatic dust removal device;
the stop valve I and the stop valve II are sequentially arranged on the pipe section of the waste gas main flue between the hole I and the hole II, the stop valve III is arranged on the pipe section of the bypass flue I between the hole I and the oxidant gas mist area, and the stop valve IV is arranged on the bypass flue II.
The turbine crew can adjust the path of the exhaust gas of the marine diesel engine by adjusting the stop valve I, the stop valve II, the stop valve III and the stop valve IV according to whether the ship enters the emission control area.
When the exhaust gas of the marine diesel engine enters an oxidant aerosol area to be mixed with oxidant aerosol generated by the atomizing device I, NO and SO in the exhaust gas of the marine diesel engine2Fast reaction to form NO-containing3 -、SO4 2-Aerosol particles and high NOxThe exhaust gas of (3); subsequently containing NO3 -、SO4 2-Aerosol particles and high NOxThe waste gas enters an alkali liquor aerosol area to further react with alkali liquor aerosol from an atomization device II to absorb high-valence NOx、SOxForm a gas containing SO4 2-、NO3 -Exhaust of aerosol particulates; the obtained waste gas enters an electrostatic dust removal area, and the particles and SO in the waste gas are removed under the action of an electrostatic field4 2-、NO3 -Removing the aerosol particles to obtain the clean waste gas meeting the emission requirement.
The pump II pumps the washing water in the liquid storage cabinet into the three-way valve, the three-way valve controls the intermittent work of the liquid storage cabinet, and the accumulated dust on the anode plate is washed by one of spraying (a spraying device) or overflowing (a liquid inlet pipe, and the washing water is discharged from the liquid inlet pipe and flows from the upper end to the lower end of the anode plate). The pump I pumps the waste liquid generated in the electrostatic dust collection area into a sludge cabinet, stores the waste liquid along with a ship and discharges the waste liquid into a port receiving device after the waste liquid is landed.
When the ship drives into the SECA, only the atomization device II works, and when the ship drives into the NECA area, the atomization device I and the atomization device II simultaneously enter a working state.
Compared with other ship diesel engine waste gas treatment technologies, the invention has the following advantages:
1. the invention adopts the oxidation absorption mode of oxidant aerial fog and alkali liquor aerial fog to form NO3 -、SO4 2-Aerosol particles are removed by using a high-voltage electrostatic dust removal device, and desulfurization, denitrification and dust removal can be simultaneously carried out in a set of device; the device can respectively work in a desulfurization dust removal mode and a desulfurization and denitrification dust removal mode according to different navigation areas; the technical system has high integration level, flexible and convenient operation and higher reliability.
2. The invention adopts atomization form to oxidize and absorb NOxAnd SOxAtomized particles with smaller diameter can be obtained, so that gas-liquid contact becomes more sufficient, the reaction rate is greatly improved, and the time required by the reaction is obviously shortened, thereby being beneficial to realizing sufficient oxidation absorption reaction in a reaction zone; the power required by atomization is very small, which is beneficial to reducing the energy consumption of the device; the utilization rate of the medicament is high, and the operation cost can be effectively reduced; the liquid consumption of the system is small, and the excessive dependence of the device on the ship fresh water resources is reduced.
3. The invention removes the particulate matter and NO by electrostatic dust collection3 -、SO4 2-Compared with other dust removal methods, the technology can effectively capture micron-sized and nano-sized particles with the greatest harm in the waste gas, and has good capturing effect on an aerosol high-voltage electrostatic dust removal device and sticky particles; the accumulated dust on the anode plate is washed intermittently, the water consumption is less, and the collected high-concentration waste liquid is small in volume and convenient to store on the ship.
Based on the reasons, the invention can be widely popularized in the fields of ship atmospheric pollution control technology and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an exhaust gas comprehensive treatment device of a marine diesel engine according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A comprehensive treatment method for exhaust gas of a marine diesel engine, which is characterized in that when a ship sails in an SECA area, the exhaust gas of the marine diesel engine is desulfurized and dedusted by adopting a desulfurization and dedusting working mode, and the method comprises the following steps:
s1, treating the exhaust gas of the marine diesel engine by alkali liquor aerosol, alkali liquor aerosol and the shipSO in diesel engine exhaust gasxFast reaction to form SO-containing3 2-、SO4 2-The alkali liquor in the alkali liquor aerosol is one or a mixture of several solutions of sodium hydroxide, magnesium hydroxide, calcium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate and seawater, and the SO is relatedxThe absorption process is as follows:
SO2+2OH-→SO3 2-+H2O
SO3 2-+2OH-→SO4 2-+H2O
2SO3 2-+O2→2SO4 2-；
s2, the SO-containing powder obtained in the step S1 is processed by a high-voltage electrostatic dust removal device3 2-、SO4 2-SO in exhaust gas of aerosol particles3 2-、SO4 2-Removing aerosol particles and other particles to obtain SO in waste gasxThe removal rate is more than 95 percent, the particulate matter removal rate is more than 80 percent, and then the mixture is discharged into the atmosphere.
Example 2
The comprehensive waste gas treating method for ship diesel engine includes the following steps:
s1, the exhaust gas of the marine diesel engine sequentially passes through oxidant gas mist and alkali liquor gas mist, the oxidant gas mist and NO and SO in the exhaust gas of the marine diesel engine2Fast reaction to form NO-containing3 -、SO4 2-Aerosol particles and high NOxThe oxidant in the oxidant aerosol is one or a mixture of several solutions of sodium chlorite, sodium hypochlorite, hydrogen peroxide, potassium permanganate, sodium chlorate, calcium hypochlorite, sodium persulfate and electrolyzed seawater; the pH value of the oxidant in the oxidant aerosol is 2-13, and NaClO is used2For example, the oxidation reaction process is as follows:
3ClO2 -+4NO→4NO3 -+3Cl-
ClO2 -+2NO→2NO2 -+Cl-
ClO-+2SO2+2H2O→4H++2SO4 2-+Cl-，
containing NO3 -、SO4 2-Aerosol particles and high NOxThe waste gas passes through the alkali liquor aerial fog, and the alkali liquor aerial fog continuously absorbs NO3 -、SO4 2-Aerosol particles and high NOxHigh valence NO in exhaust gas of (2)x、SOxForm a gas containing SO4 2-、NO3 -The waste gas of aerosol particles, the alkali liquor in the alkali liquor aerial fog is one solution or a mixed solution of several solutions of sodium hydroxide, magnesium hydroxide, calcium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate and seawater, and the related absorption reaction process is as follows:
SO2+2OH-→SO3 2-+H2O
SO3 2-+2OH-→SO4 2-+H2O
2SO3 2-+O2→2SO4 2-
2NO2+2OH-→NO2 -+NO3 -+H2O；
s2, the SO-containing powder obtained in the step S1 is processed by a high-voltage electrostatic dust removal device4 2-、NO3 -SO in exhaust gas of aerosol particles4 2-、NO3 -Removing aerosol particles and other particles to obtain NO in waste gasxThe removal rate of (1) is more than 85 percent, and SOxThe removal rate is more than 95 percent, the particulate matter removal rate is more than 80 percent, and then the mixture is discharged into the atmosphere.
Example 3
As shown in fig. 1, the comprehensive treatment device for exhaust gas of a marine diesel engine comprises an exhaust gas main flue 1, a bypass flue I2, a bypass flue II3, a stop valve I4, a stop valve II5, a stop valve III6, a stop valve IV7, an oxidant aerosol zone 8, an alkali aerosol zone 9, a high-voltage electrostatic dust removal device 10, an atomization device I11, an atomization device II12, a pump I13, a pump II14, a liquid storage cabinet 15, a three-way valve 16 and a sludge cabinet 17;
one end of the waste gas main flue 1 is communicated with the smoke outlet of the diesel engine, a hole I communicated with the bypass flue I2 is formed in the side wall of the waste gas main flue 1, and a hole II communicated with the bypass flue II3 is formed in the side wall of a pipe section of the waste gas main flue 1 between the smoke outlet of the waste gas main flue 1 and the hole I;
the other end of the bypass flue I2 is communicated with the lower part of the side wall of the high-voltage electrostatic dust removal device 10, the oxidant aerosol region 8 and the alkali liquor aerosol region 9 are arranged in the bypass flue I2, the holes I are communicated with the high-voltage electrostatic dust removal device 10 sequentially through the oxidant aerosol region 8 and the alkali liquor aerosol region 9, the atomizing device I11 is arranged at the bottom of the oxidant aerosol region 8, an aerosol nozzle of the atomizing device I11 faces upwards, the atomizing device I11 is provided with an oxidant injection pipe 18, the atomizing device II12 is arranged at the bottom of the alkali liquor aerosol region 9, an aerosol nozzle of the atomizing device II12 faces upwards, and the atomizing device II12 is provided with an alkali liquor injection pipe 19;
an electrostatic dust removal area is arranged in the high-voltage electrostatic dust removal device 10, a cathode electrode 20 and an anode plate 21 are arranged in the electrostatic dust removal area, the cathode electrode 20 is connected with the cathode output end of a high-voltage power supply 22, the anode plate 21 is connected with the ground wire of the high-voltage power supply 22, the bottom end of the high-voltage electrostatic dust removal device 10 is communicated with the sludge cabinet 17 through a pump I13, a spraying device 23 is arranged above the electrostatic dust removal area, a liquid inlet pipe 24 is arranged at the upper end of the anode plate 21, the liquid storage cabinet 15 is communicated with a three-way valve 16 through a pump II14, and the three-way valve 16 is respectively communicated with the spraying device 23 and the liquid inlet pipe 24;
the other end of the bypass flue II3 is communicated with the top end of the high-voltage electrostatic dust collection device 10;
hole I with be equipped with in proper order on the pipe section of waste gas main flue 1 between the hole II stop valve I4 stop valve II5, hole I with be equipped with between the oxidant gas fog district 8 the pipe section of bypass flue I2 is equipped with stop valve III6, be equipped with on the bypass flue II3 stop valve IV 7.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The comprehensive treatment method of the exhaust gas of the marine diesel engine is characterized by comprising the following steps of:
s1, passing the exhaust gas of the marine diesel engine through alkali liquor aerial fog or sequentially passing through oxidant aerial fog and alkali liquor aerial fog;
s2, removing the particulate matters in the waste gas obtained in the step S1 through a high-voltage electrostatic dust removal device, and then discharging the waste gas into the atmosphere;
the atomization mode of the oxidant aerial fog and the alkali liquor aerial fog is ultrasonic atomization;
the diameters of the particles of the oxidant aerial fog and the alkali liquor aerial fog are 1-100 mu m;
in the step S1, the exhaust gas of the marine diesel engine passes through the alkali liquor aerial fog, the alkali liquor aerial fog and SO in the exhaust gas of the marine diesel enginexFast reaction to form SO-containing3 2-、SO4 2-Exhaust of aerosol particulates;
in step S1, the exhaust gas of the marine diesel engine sequentially passes through the oxidant gas mist and the alkali liquor gas mist, the oxidant gas mist and NO and SO in the exhaust gas of the marine diesel engine2Fast reaction to form NO-containing3 -、SO4 2-Aerosol particles and high NOx、SOxContaining NO3 -、SO4 2-Aerosol particles and high NOx、SOxThe waste gas passes through the alkali liquor aerial fog, and the alkali liquor aerial fog continuously absorbs NO3 -、SO4 2-Aerosol particles and high NOx、SOxHigh valence NO in exhaust gas of (2)x、SOxForm a gas containing SO4 2-、NO3 -Exhaust of aerosol particulates;
a comprehensive treatment method for exhaust gas of a marine diesel engine is characterized in that a comprehensive treatment device for exhaust gas of the marine diesel engine is adopted, and the comprehensive treatment device for exhaust gas of the marine diesel engine comprises an exhaust gas main flue, a bypass flue I, a bypass flue II, a stop valve I, a stop valve II, a stop valve III, a stop valve IV, an oxidant gas mist area, an alkali liquor gas mist area, a high-voltage electrostatic dust removal device, an atomization device I, an atomization device II, a pump I, a pump II, a liquid storage cabinet, a three-way valve and a sludge cabinet;
one end of the waste gas main flue is communicated with the smoke outlet of the diesel engine, a hole I communicated with the bypass flue I is formed in the side wall of the waste gas main flue, and a hole II communicated with the bypass flue II is formed in the side wall of the pipe section of the waste gas main flue between the smoke outlet of the waste gas main flue and the hole I;
the other end of the bypass flue I is communicated with the lower part of the side wall of the high-voltage electrostatic dust removal device, the oxidant gas mist area and the alkali liquid gas mist area are arranged in the bypass flue I, the holes I are communicated with the high-voltage electrostatic dust removal device sequentially through the oxidant gas mist area and the alkali liquid gas mist area, the atomizing device I is arranged at the bottom of the oxidant gas mist area, the gas mist nozzle of the atomizing device I faces upwards, the oxidant injection pipe is arranged on the atomizing device I, the atomizing device II is arranged at the bottom of the alkali liquid gas mist area, the gas mist nozzle of the atomizing device II faces upwards, and the alkali liquid injection pipe is arranged on the atomizing device II;
the high-voltage electrostatic dust removal device is internally provided with an electrostatic dust removal area, a cathode electrode and an anode plate are arranged in the electrostatic dust removal area, the cathode electrode is connected with the cathode output end of a high-voltage power supply, the anode plate is connected with the ground wire of the high-voltage power supply, the bottom end of the high-voltage electrostatic dust removal device is communicated with the sludge cabinet through the pump I, a spraying device is arranged above the electrostatic dust removal area, the upper end of the anode plate is provided with a liquid inlet pipe, the liquid storage cabinet is communicated with the three-way valve through the pump II, and the three-way valve is respectively communicated with the spraying device and the liquid inlet pipe;
the other end of the bypass flue II is communicated with the top end of the high-voltage electrostatic dust removal device;
the stop valve I and the stop valve II are sequentially arranged on the pipe section of the waste gas main flue between the hole I and the hole II, the stop valve III is arranged on the pipe section of the bypass flue I between the hole I and the oxidant gas mist area, and the stop valve IV is arranged on the bypass flue II.
2. The comprehensive treatment method for the exhaust gas of the marine diesel engine according to claim 1, characterized in that: the oxidant in the oxidant aerosol is one or a mixture of several solutions of sodium chlorite, sodium hypochlorite, hydrogen peroxide, potassium permanganate, sodium chlorate, calcium hypochlorite, sodium persulfate and electrolyzed seawater; the pH value of the oxidant in the oxidant gas fog is 2-13.
3. The comprehensive treatment method for the exhaust gas of the marine diesel engine according to claim 1, characterized in that: the alkali liquor in the alkali liquor aerosol is one solution or a mixture of several solutions of sodium hydroxide, magnesium hydroxide, calcium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate and seawater.
4. The comprehensive treatment method for the exhaust gas of the marine diesel engine according to claim 1, characterized in that: the high-voltage electrostatic dust removal device is a wet high-voltage electrostatic dust removal device.
5. The comprehensive treatment method for the exhaust gas of the marine diesel engine according to claim 1, characterized in that:
according to exhaust gases of marine diesel enginesNOx、SO2The concentration of the oxidant in the oxidant gas mist and the alkali liquor in the alkali liquor gas mist and the atomization amount of the oxidant gas mist and the alkali liquor gas mist can be adjusted.
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| CN108609150A (en) * | 2018-03-23 | 2018-10-02 | 哈尔滨工程大学 | A kind of ship tail gas processing system by-pass collar and processing method |
| CN108744934A (en) * | 2018-06-25 | 2018-11-06 | 山东首丰环保设备有限公司 | A kind of method of redox denitration |
| CN110038393A (en) * | 2019-04-04 | 2019-07-23 | 大连船舶重工集团有限公司 | A kind of ship desulphurization system |
| CN112915786A (en) * | 2021-01-22 | 2021-06-08 | 中国船舶重工集团公司第七一一研究所 | Tail gas desulfurization and denitrification system and tail gas desulfurization and denitrification treatment process |
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