CN212440675U - Plasma-based ship tail gas desulfurization and denitrification system - Google Patents
Plasma-based ship tail gas desulfurization and denitrification system Download PDFInfo
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- CN212440675U CN212440675U CN202020579827.3U CN202020579827U CN212440675U CN 212440675 U CN212440675 U CN 212440675U CN 202020579827 U CN202020579827 U CN 202020579827U CN 212440675 U CN212440675 U CN 212440675U
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Abstract
The utility model belongs to the technical field of ship exhaust handles technique and specifically relates to a ship exhaust desulfurization denitration system based on plasma is related to, including one-level low temperature plasma reaction unit, washing device, second grade low temperature plasma reaction unit, SCR denitrationA device and a urea pyrolysis device; the primary low-temperature plasma reaction device, the washing device, the secondary low-temperature plasma reaction device and the SCR denitration device are sequentially connected end to end; and the gas output end of the urea pyrolysis device is respectively communicated with the primary low-temperature plasma reaction device and the SCR denitration device. The system can solve the problems of blockage and inactivation of the SCR denitration device by wet washing and desulfurization treatment of the flue gas, can widen the reaction temperature window by improving the reaction activity of pollutants through low-temperature plasma, improve the denitration efficiency and realize the wide-load NOXThe ultra-low emission and the problem of overlarge volume of the catalyst device are solved.
Description
Technical Field
The utility model belongs to the technical field of ship tail gas processing technique and specifically relates to a ship tail gas SOx/NOx control system based on plasma is related to.
Background
The exhaust gas emission of ships has become one of the main emission sources of atmospheric pollutants, and is mainly generated by marine diesel engines, and the pollutants in the exhaust gas are mainly SOXWith NOXMainly gas. International maritime organization IMO attaching convention VI to SO through MARPOLXWith NOXThe emission of the catalyst is severely limited, and therefore, the removal technology process faces a serious challenge.
At present, the commonly used technology for desulfurization and denitrification of ship tail gas mainly comprises the following steps: flue gas desulfurization by a gypsum method, a rotary spray drying method, flue gas desulfurization, seawater washing desulfurization, selective non-catalytic reduction (SNCR) denitration, Selective Catalytic Reduction (SCR) denitration and the like. Wherein, in the seawater washing desulphurization method, the price and the desulphurization cost of the seawater washing desulphurization equipment are lower, the process is simple, the technology is mature,can solve the problem of difficult storage and transportation of raw materials, is a desulfurization technology which is very suitable for ships, but has relatively low alkalinity of natural seawater and high concentration value SO2The flue gas removal effect is not good, the pH value of the waste seawater after seawater washing is low, the waste seawater cannot be directly discharged into the ocean, and a large amount of air needs to be blown into an aeration tank to remove sulfite SO3 2-Oxidation to stable SO friendly to marine ecology4 2-Various auxiliary devices are required to be added, and a large amount of electric energy is consumed; in addition, the NO in the exhaust gas discharged by the marine diesel engineX90 percent of the NO is almost not absorbed by water or alkali liquor, so the seawater washing desulfurization method has higher desulfurization efficiency, but is difficult to remove NO simultaneouslyXAnd SO present in flue gas in large quantitiesXThe catalyst has an inhibiting effect on the activity of the catalyst, and ammonium bisulfate can be produced at a lower temperature, so that the catalyst is blocked and cannot work normally.
Therefore, the development of a high-efficiency treatment technology which can realize high-efficiency desulfurization and denitrification, meet the emission standard of ship tail gas, avoid the phenomena of SCR catalyst blockage and poisoning and is suitable for the desulfurization and denitrification of the ship tail gas is a technical problem to be solved urgently in the technical field of the current ship tail gas treatment.
SUMMERY OF THE UTILITY MODEL
The first purpose of the utility model is to provide a ship tail gas desulfurization and denitrification system, which can realize high-efficiency desulfurization and denitrification and meet the ship tail gas emission standard;
a second object of the present invention is to provide a method for desulfurization and denitrification of ship exhaust gas, which aims to solve the problem that the seawater washing desulfurization method is difficult to remove NO simultaneouslyXAnd SO present in flue gas in large quantitiesXHas an inhibitory effect on the activity of the catalyst.
The utility model provides a plasma-based ship tail gas desulfurization and denitrification system, which comprises a primary low-temperature plasma reaction device, a washing device, a secondary low-temperature plasma reaction device, an SCR denitrification device and a urea pyrolysis device;
the primary low-temperature plasma reaction device, the washing device, the secondary low-temperature plasma reaction device and the SCR denitration device are sequentially connected end to end;
and the gas output end of the urea pyrolysis device is respectively communicated with the primary low-temperature plasma reaction device and the SCR denitration device.
The utility model discloses an among the boats and ships tail gas SOx/NOx control system, one-level low temperature plasma reaction unit, washing device, second grade low temperature plasma reaction unit and SCR denitrification facility end to end connection in proper order, the gas output end of urea pyrolysis device communicates with one-level low temperature plasma reaction unit and SCR denitrification facility respectively, and in the urea pyrolysis device, urea solution decomposes and produces NH3、CO2And H2O, and further provides NH for the primary low-temperature plasma reaction device and the SCR denitration device3Firstly, SO in the tail gas is treated by a primary low-temperature plasma reaction device2And oxidation of NO to higher valence SO3And NO2(ii) a SO in high valence state3And NO2And NH3Is introduced into the washing device together with NH3The alkalinity of the natural seawater is improved, and further the SO of the seawater is greatly improved2、SO3NO and NO2The absorption rate of the gas is equal, the volume of the washing device is reduced, the energy consumption of tail gas treatment is reduced, and in addition, the SO is generated2NO gas is oxidized into SO3And NO2Then, after being neutralized by an alkaline substance in a washing apparatus, the resultant is neutralized with SO4 2-And NO3 2-The washing wastewater in the form of neutral is discharged into an after-treatment system without blowing a large amount of air for oxidation, and a seawater quality recovery system is not required, so that energy waste is avoided; SO in tail gas after being treated by a washing device2Is basically removed, partial NO is also removed, and after entering a secondary low-temperature plasma reaction device, the residual small amount of NO which is not completely absorbed can be oxidized into NO2By which NO and NO are converted2The catalytic reaction temperature can be reduced to 150 ℃ by adjusting the proportion to a proper value, and at the moment, the tail gas does not contain SO3And SO2When acid gas exists, the generation of ammonium sulfate and the catalysis cannot be causedThe phenomena of agent blockage and poisoning, and in addition, most of smoke dust is removed in the device, and the phenomenon of ash blockage of the catalyst is not caused; finally, NO2And NH produced in the urea pyrolysis plant3And the gas is introduced into the SCR denitration device, and the activity of the pollutant gas treated by the secondary low-temperature plasma reaction device is increased to some extent, and the concentration of the pollutant gas is also reduced to some extent, so that the volumes of the washing device and the SCR denitration device can be greatly reduced, and the occupied space of the system is reduced.
The washing device in the utility model is preferably the seawater washing device used in the seawater washing desulfurization method, and the first-level low-temperature plasma reaction device and the second-level low-temperature plasma reaction device are preferably low-temperature plasma reactors.
Further, the device also comprises a first heat exchanger, a second heat exchanger and an auxiliary heating device;
the first heat exchanger, the auxiliary heating device, the second heat exchanger and the urea pyrolysis device are communicated in sequence;
the first heat exchanger is communicated with the primary low-temperature plasma reaction device;
the second heat exchanger is arranged on a passage between the washing device and the secondary low-temperature plasma reaction device and is communicated with the washing device and the secondary low-temperature plasma reaction device.
The utility model discloses an still include first heat exchanger, second heat exchanger and auxiliary heating device among the SOx/NOx control system, wherein, first heat exchanger, auxiliary heating device, second heat exchanger and urea pyrolysis device communicate in proper order, first heat exchanger and one-level low temperature plasma reaction unit intercommunication, the second heat exchanger setting on the route between washing device and second grade low temperature plasma reaction unit to with washing device, second grade low temperature plasma reaction unit intercommunication. Therefore, the temperature of the high-temperature ship tail gas is reduced to 50-150 ℃ after passing through the first heat exchanger, the first heat exchanger conveys hot air obtained by heat exchange with the high-temperature tail gas to the auxiliary heating device, the auxiliary heating device further heats the hot air to 600-plus-700 ℃, and the auxiliary heating device is communicated with the second heat exchanger, so that the hot air at the temperature of 600-plus-700 ℃ can be conveyed to the second heat exchanger, and the hot air of the second heat exchanger is utilized to carry out heat exchange treatment on the tail gas exhausted from the washing device to 50-150 ℃ so as to facilitate the secondary low-temperature plasma reaction device to continuously treat the tail gas.
Further, the primary low-temperature plasma reaction device comprises a primary plasma power supply and a primary plasma generator;
the primary plasma power supply is electrically connected with the primary plasma generator, and two ends of the primary plasma generator are respectively communicated with the first heat exchanger and the washing device.
The utility model discloses an one-level low temperature plasma reaction unit includes one-level plasma power and one-level plasma generator, the high energy free radical that one-level plasma power produced and the H among the marine exhaust through plasma generator2O、O2And N2The neutral molecules collide to generate ions, electrons and excited atoms with stronger activity, and further SO in the tail gas is removed2And NO gas to high valence SO3And NO2。
Further, the secondary low-temperature plasma reaction device comprises a secondary plasma power supply and a secondary plasma generator;
the secondary plasma power supply is electrically connected with the secondary plasma generator, and two ends of the secondary plasma generator are respectively communicated with the second heat exchanger and the SCR denitration device.
The utility model discloses a second grade low temperature plasma reaction unit includes second grade plasma power and second grade plasma generator, the high energy free radical that second grade plasma power produced and the H among the ship tail gas in the process plasma generator2O、O2And N2Ions, electrons and excited atoms with stronger activity are generated by collision of neutral molecules, and part of NO in the tail gas is oxidized into NO2And can control NO and NO in the tail gas by adjusting the energy of the secondary plasma power supply2And (4) proportion.
The utility model also discloses a boats and ships tail gas SOx/NOx control method based on plasma, including following step:
s1, treating the ship tail gas by a primary low-temperature plasma reaction device, and then treating SO in the tail gas2And NO are oxidized to SO respectively3And NO2；
S2, introducing the tail gas treated by the primary low-temperature plasma reactor device into a washing device;
s3, introducing the tail gas treated by the washing device into a secondary low-temperature plasma reaction device;
s4, carrying out treatment on the tail gas treated by the secondary low-temperature plasma reaction device and NH generated by the urea pyrolysis device3Introducing into SCR denitration device to remove NO and NO in tail gas2And (4) removing.
The utility model also discloses a boats and ships tail gas SOx/NOx control method based on plasma, including following step: firstly, a primary low-temperature plasma reaction device is used for treating ship tail gas, ions, electrons and excited atoms with strong activity generated by collision in the primary low-temperature plasma reaction device are utilized to remove SO in the tail gas2And NO are oxidized to SO respectively3And NO2(ii) a Secondly, introducing the tail gas treated by the primary low-temperature plasma reactor device into a washing device, wherein on one hand, high-valence SO3And NO2Is easier to be absorbed and removed by seawater, on the other hand, because of NH3Causes the alkalinity of the seawater absorbent solution to increase, and further causes the SO2The absorption rate of gases such as NO and the like is greatly improved, and SO in tail gas is obtained after the step of seawater wet washing2Is substantially removed; then, introducing the tail gas treated by the washing device into a secondary low-temperature plasma reaction device, and oxidizing the residual part of NO in the tail gas into NO by utilizing ions, electrons and excited atoms with stronger activity generated by collision in the secondary low-temperature plasma reaction device2And controlling NO and NO2In a proper proportion range, the SCR denitration efficiency is improved, and the catalytic reaction temperature is reduced; finally, the tail gas treated by the secondary low-temperature plasma reaction device and NH generated by the urea pyrolysis device3Is introduced intoIn the SCR denitration device, NO and NO in the tail gas are separated2And (4) removing. Firstly, using a first-stage low-temperature plasma reaction device to remove SO in tail gas2And oxidation of NO to higher valence SO3And NO2Further improve the SO ratio of the seawater washing device2NO, etc., reducing the volume of the washing device, and absorbing SO3And NO2In a washing apparatus with SO4 2-And NO3 2-The catalyst is neutral and can be discharged into an after-treatment system without blowing a large amount of air for oxidation; in addition, the tail gas treated by the washing device has no SO2、SO3When the acid gas exists, the production of ammonium sulfate and the phenomena of catalyst blockage and poisoning are not caused, and the secondary low-temperature plasma reaction device can react NO and NO2And adjusting to a proper proportion, so that the SCR denitration device achieves the optimal denitration efficiency, the catalytic reaction temperature is reduced, and the reaction temperature window is widened.
Further, step S1 specifically includes: reducing the temperature of the ship tail gas treated by the first heat exchanger to 50-150 ℃ and NH generated by a urea pyrolysis device3Inputting the mixture into a first-stage low-temperature plasma reaction device to remove SO in the tail gas2And NO are oxidized to SO respectively3And NO2；
Wherein NH3With SO in the tail gas2In a molar ratio of (2-5): 1.
wherein, step S1 specifically includes: reducing the temperature of the ship tail gas treated by the first heat exchanger to 50-150 ℃ and NH generated by a urea pyrolysis device3Inputting the mixture into a first-stage low-temperature plasma reaction device to remove SO in the tail gas2And NO are oxidized to SO respectively3And NO2SO at 50-150 deg.C by low-temperature plasma reaction2And NO, with the urea pyrolysis unit providing NH3The dosage of is SO in the tail gas22-5 times the molar amount, i.e. NH3Relative to SO2Excess, on the one hand, may be reacted with SO3And NO2Reaction of acid gas to ammonium salt and, on the other hand, unreacted NH3Is input into the washing device and can be increasedThe alkalinity of the seawater reduces energy consumption.
Further, step S2 specifically includes: tail gas treated by the first-stage low-temperature plasma reactor device and unreacted NH3Introducing into a washing device to remove SO in the tail gas3And part of NO and NO2。
Step S2 specifically includes: the tail gas treated by the first-stage low-temperature plasma reactor device contains SO3And NO2Reacting it with unreacted NH3Introducing into a washing device to increase the alkalinity of seawater in the washing device and to increase SO in the tail gas2Has been totally converted into SO3And SO3In seawater with SO4 2-Is stable, NO air is required to be blown in again, the energy consumption is reduced, and the NO which is hardly absorbed by the alkali liquor is converted into the NO which can be absorbed by the alkali liquor2. Therefore, SO in the tail gas can be removed in this step3And part of NO and NO2。
Further, step S3 specifically includes: the tail gas treated by the washing device is subjected to heat exchange treatment by a heat exchanger until the temperature is raised to 50-150 ℃, and then the tail gas is input into a secondary low-temperature plasma reaction device to oxidize the NO which is not completely reacted in the washing device into NO2And controlling NO and NO2In a molar ratio of 1: (0.8-1.2).
Step S3 specifically includes: the tail gas treated by the washing device is subjected to heat exchange treatment by a heat exchanger until the temperature is raised to 50-150 ℃, and then the tail gas is input into a secondary low-temperature plasma reaction device to oxidize the NO which is not completely reacted in the washing device into NO2And controlling NO and NO2In a molar ratio of 1: (0.8-1.2) control of NO and NO2In a molar ratio of 1: (0.8-1.2), the denitration efficiency can be improved, the catalytic reaction temperature is reduced to 150 ℃, and the catalytic reaction temperature window is widened.
Further, in step S4, the NO in the tail gas treated by the secondary low-temperature plasma reaction device is controlledXAnd NH3In a molar ratio of 1: (1-1.5).
Excess NH in step S43Can be used as a reducing agent for SCR denitration reaction to react NO and NO2Reducing to N without environmental pollution2And further completing the treatment of residual NO and NO in the tail gas2And (4) removing.
Further, in step S4, the type of the catalyst in the SCR denitration device is honeycomb type, plate type or corrugated type; the catalyst is any one of transition metal oxide, noble metal or ion exchange molecular sieve.
The catalyst in the SCR denitration device is in a honeycomb type, a plate type or a corrugated type, wherein the plate type catalyst mainly uses a metal net formed by pressing a stainless steel metal plate as a base material, and TiO is added into the base material2、V2O5Etc. adhered to the stainless steel mesh; the honeycomb catalyst is typically a homogeneous catalyst; corrugated plate catalysts are generally glass fiber reinforced TiO2As a base material, WO3、V2O5Etc. are impregnated into the surface of the catalyst. And the catalyst may be V2O5(WO3)、Fe2O3、CuO、CrOx、MnOx、MgO、MoO3And a transition metal oxide such as NiO, and a noble metal or an ion-exchange molecular sieve.
The utility model discloses a boats and ships tail gas SOx/NOx control system compares with prior art, has following advantage:
1. the utility model discloses utilize one-level low temperature plasma reaction unit with SO in the flue gas2And NO is oxidized into high-valence state, and then seawater is used as a detergent to carry out wet washing for removal, on one hand, high-valence SO3And NO2Is easier to absorb and remove by lye, on the other hand, because of NH3Such that the alkalinity of the seawater absorbent solution is increased. Thus, the processing system is paired with SO2The absorption rate of gases such as NO and the like is greatly improved, and the volume of the treatment system is reduced;
2. SO obtained by oxidation in a first-stage low-temperature plasma reaction device3And NO2After being neutralized by alkaline substances in a washing device, the product is neutralized by SO4 2-And NO3 2-In the form of washing waste seawater, is neutral and does not need to blow a large amount of air for oxidation, i.e.Can be discharged into an after-treatment system, thereby reducing the energy consumption of treatment;
3. SO in tail gas after being treated by a washing device2Is basically removed, partial NO is also removed, and after entering a secondary low-temperature plasma reaction device, the residual small amount of NO which is not completely absorbed can be oxidized into NO2By which NO and NO are converted2The catalytic reaction temperature can be reduced to 150 ℃ by adjusting the proportion to a proper value, and at the moment, the tail gas does not contain SO3And SO2When the acidic gas exists, the generation of ammonium sulfate can not be caused, the phenomena of catalyst blockage and poisoning can not be caused, in addition, most of smoke dust is removed in the device, and the phenomenon of catalyst ash blockage can not be caused;
4. because the activity of the pollutant gas treated by the secondary low-temperature plasma reaction device is increased and the concentration is reduced, the volumes of the washing device and the SCR denitration device can be greatly reduced, and the occupied space of the system is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described 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 diagram of a plasma-based ship tail gas desulfurization and denitrification system of the present invention;
FIG. 2 is a flow chart of the desulfurization and denitrification method for ship exhaust.
Description of reference numerals:
1: a first-stage low-temperature plasma reaction device; 2: a washing device; 3: a secondary low-temperature plasma reaction device; 4: an SCR denitration device; 5: a urea pyrolysis unit; 6: a first heat exchanger; 7: a second heat exchanger; 8: an auxiliary heating device; 9: a primary plasma power supply; 10: a primary plasma generator; 11: a secondary plasma power supply; 12: a secondary plasma generator.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-2, the utility model discloses a ship tail gas desulfurization and denitrification system based on plasma, including one-level low temperature plasma reaction unit 1, washing device 2, second grade low temperature plasma reaction unit 3, SCR denitrification facility 4 and urea pyrolysis device 5; the primary low-temperature plasma reaction device 1, the washing device 2, the secondary low-temperature plasma reaction device 3 and the SCR denitration device 4 are sequentially connected end to end; and the gas output end of the urea pyrolysis device 5 is respectively communicated with the primary low-temperature plasma reaction device 1 and the SCR denitration device 4.
The utility model discloses an among the ship tail gas SOx/NOx control system based on plasma, the NH that the pyrolysis produced in ship tail gas and the urea pyrolysis device 53、H2O and N2The plasma gas enters a primary low-temperature plasma reaction device 1, and high-energy electrons generated by the primary low-temperature plasma reaction device 1 are used for removing H in the tail gas2O、O2And N2The neutral molecules are ionized into free electrons and free radicals due to O in the discharged ship tail gas2Is usually 10-14%, and has a high oxygen content, and the free electrons and free radicals can lead SO in the tail gas2And oxidation of NO to higher valence SO3And NO2Part of SO3And NO2With NH in the exhaust gas3And H2The O reacts to generate neutral substances such as ammonium sulfate, ammonium nitrate and the like, then the tail gas enters a washing device 2, and the incompletely reacted SO in the tail gasxAnd NOxThe components are removed in a washing device 2, seawater is adopted as a washing agent in the washing device 2, and alkaline substances and SO in the seawater are used3And NO2The acid gases are subjected to neutralization reaction to generate neutral substances such as sulfate, nitrate and the like, and incompletely reacted NH in tail gas3The alkali of the seawater can be enhanced after being mixed with the seawater, and the SO of the seawater is increased3And NO2Since the absorption process generates mainly sulfate and nitrate, the generation of a large amount of Sulfite (SO) in the conventional washing device 2 is avoided or reduced3 2-) And Nitrite (NO)2 2-) Blowing a large amount of air to oxidize into neutral substance SO4 2-And NO3 2-Due to the process ofTherefore, the washing device 2 in the system can realize SO in tail gasxThe removal rate reaches more than 90 percent. After being treated by the washing device 2, the tail gas still contains the NO which is not completely reacted2And NO which does not participate in the reaction, conveying the tail gas to a secondary low-temperature plasma reaction device 3, and controlling NO and NO in the tail gas at the outlet of the reactor through the power of the secondary low-temperature plasma reaction device 32Then with the NH generated by the urea pyrolysis unit 53And H2Mixing O and the like uniformly, and then feeding the mixture into an SCR denitration reactor to realize NOxOf the system to NOxThe removal rate of the catalyst can reach more than 95 percent.
On the basis of the technical scheme, the system further comprises a first heat exchanger 6, a second heat exchanger 7 and an auxiliary heating device 8; the first heat exchanger 6, the auxiliary heating device 8, the second heat exchanger 7 and the urea pyrolysis device 5 are communicated in sequence; the first heat exchanger 6 is communicated with the primary low-temperature plasma reaction device 1; the second heat exchanger 7 is arranged on a passage between the washing device 2 and the secondary low-temperature plasma reaction device 3, and is communicated with the washing device 2 and the secondary low-temperature plasma reaction device 3.
The utility model discloses an still include first heat exchanger 6, second heat exchanger 7 and auxiliary heating device 8 among the SOx/NOx control system, wherein, first heat exchanger 6, auxiliary heating device 8, second heat exchanger 7 and urea pyrolysis device 5 communicate in proper order, first heat exchanger 6 and one-level low temperature plasma reaction unit 1 intercommunication, second heat exchanger 7 sets up on the passageway between washing device 2 and second grade low temperature plasma reaction unit 3 to with washing device 2, second grade low temperature plasma reaction unit 3 intercommunication. Firstly, after the high-temperature ship tail gas is treated by the first heat exchanger 6, the temperature of the tail gas is reduced from 200-450 ℃ to 50-150 ℃, and the tail gas after the temperature reduction is generated with NH generated by the urea pyrolysis device 53、CO2And H2Gas such as O enters a first-stage low-temperature plasma reaction device 1; the pyrolysis air required in the urea pyrolysis device 5 is heated after heat exchange through the first heat exchanger 6, the air is heated to 600-700 ℃ through the auxiliary heating device 8, and then the air is subjected to second heat exchangeThe device 7 carries out heat exchange, the temperature of the tail gas is heated to 50-150 ℃, hot air after heat exchange enters the urea pyrolysis device 5 at the high temperature of 600 ℃, and the urea solution is pyrolyzed in the urea pyrolysis device 5 to form NH with the integral number content of 5 percent3The mixed gas is mixed with the tail gas.
On the basis of the technical scheme, preferentially, the primary low-temperature plasma reaction device 1 comprises a primary plasma power supply 9 and a primary plasma generator 10; the primary plasma power supply 9 is electrically connected with the primary plasma generator 10, and two ends of the primary plasma generator 10 are respectively communicated with the first heat exchanger 6 and the washing device 2.
The utility model discloses an one-level low temperature plasma reaction unit 1 includes one-level plasma power 9 and one-level plasma generator 10, the high energy free radical that one-level plasma power 9 produced and the H in the ship tail gas among the plasma generator2O、O2And N2The neutral molecules collide to generate ions, electrons and excited atoms with stronger activity, and further SO in the tail gas is removed2And NO gas to high valence SO3And NO2The energy of free electrons in the primary plasma generator 10 is adjusted by adjusting the output power of the primary plasma power supply 9, SO that SO in the tail gas2Complete oxidation to high valence SO3。
On the basis of the above technical solution, preferably, the secondary low-temperature plasma reaction device 3 includes a secondary plasma power supply 11 and a secondary plasma generator 12; the secondary plasma power supply 11 is electrically connected with the secondary plasma generator 12, and two ends of the secondary plasma generator 12 are respectively communicated with the second heat exchanger 7 and the SCR denitration device 4.
The utility model discloses a second grade low temperature plasma reaction unit 3 includes second grade plasma power 11 and second grade plasma generator 12, the high energy free radical that second grade plasma power 11 produced and the H among the ship tail gas in the process plasma generator2O、O2And N2The collision of neutral molecules generates ions, electrons and excitations with stronger activityGenerating atoms, and oxidizing part of NO in the tail gas into NO2And the output power of the secondary plasma power supply 11 can be adjusted to adjust the energy of free electrons in the secondary plasma generator 12, and NO in the tail gas can be controlled2And (4) proportion.
On the basis of the above preferred technical solution, further, the primary plasma power supply 9 and the secondary plasma power supply 11 are any one of direct current, alternating current or pulse discharge.
The desulfurization and denitrification system in the above preferred embodiment is used for treating high-temperature ship exhaust gas, and the specific implementation method is as follows.
S1, reducing the temperature of the ship tail gas treated by the first heat exchanger 6 to 150 ℃ and NH generated by the urea pyrolysis device 53Inputting the mixture into a first-stage low-temperature plasma reaction device 1 to remove SO in the tail gas2And NO are oxidized to SO respectively3And NO2(ii) a Wherein NH3With SO in the tail gas2In a molar ratio of 3: 1.
s2, treating the tail gas treated by the primary low-temperature plasma reactor device and unreacted NH3Introducing into a washing device 2 to remove SO in the tail gas3And part of NO and NO2。
S3, conducting heat exchange treatment on the tail gas treated by the washing device 2 through a heat exchanger until the temperature rises to 150 ℃, then inputting the tail gas into the secondary low-temperature plasma reaction device 3, and oxidizing the NO which is not completely reacted in the washing device 2 into NO2And controlling NO and NO2In a molar ratio of 1: 1.
s4, carrying out treatment on the tail gas treated by the secondary low-temperature plasma reaction device 3 and NH generated by the urea pyrolysis device 53Is introduced into the SCR denitration device 4 together to control NO in the tail gas treated by the secondary low-temperature plasma reaction device 3XAnd NH3In a molar ratio of 1: 1.5, using SCR denitration device 4 to remove NO and NO in the tail gas2Conversion to N2And then removed.
Through detection, when the method is used for treating the high-temperature ship tail gas, the removal rate of SOx in the tail gas can reach 95%, and the removal rate of NOx can reach 98%. To sum up, the utility modelThe traditional technical route of firstly denitrating and then desulfurizing ship tail gas is adjusted, the problems of blocking and inactivation of an SCR (selective catalytic reduction) denitration device 4 are solved by firstly washing and desulfurizing the tail gas by a tail gas wet method, the reactivity of pollutants is improved by low-temperature plasma, a reaction temperature window is widened, the denitration efficiency is improved, and the wide-load NO is realizedxThe ultra-low emission and the overlarge volume of the device.
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; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (5)
1. A plasma-based ship tail gas desulfurization and denitrification system is characterized by comprising a primary low-temperature plasma reaction device (1), a washing device (2), a secondary low-temperature plasma reaction device (3), an SCR denitrification device (4) and a urea pyrolysis device (5);
the primary low-temperature plasma reaction device (1), the washing device (2), the secondary low-temperature plasma reaction device (3) and the SCR denitration device (4) are sequentially connected end to end;
and the gas output end of the urea pyrolysis device (5) is respectively communicated with the primary low-temperature plasma reaction device (1) and the SCR denitration device (4).
2. The desulfurization and denitrification system according to claim 1, further comprising a first heat exchanger (6), a second heat exchanger (7) and an auxiliary heating device (8);
the first heat exchanger (6), the auxiliary heating device (8), the second heat exchanger (7) and the urea pyrolysis device (5) are communicated in sequence;
the first heat exchanger (6) is communicated with the primary low-temperature plasma reaction device (1);
the second heat exchanger (7) is arranged on a passage between the washing device (2) and the secondary low-temperature plasma reaction device (3) and is communicated with the washing device (2) and the secondary low-temperature plasma reaction device (3).
3. The desulfurization and denitrification system according to claim 2, wherein the primary low-temperature plasma reaction device (1) comprises a primary plasma power supply (9) and a primary plasma generator (10);
the primary plasma power supply (9) is electrically connected with the primary plasma generator (10), and two ends of the primary plasma generator (10) are respectively communicated with the first heat exchanger (6) and the washing device (2).
4. The desulfurization and denitrification system according to claim 3, wherein said secondary low-temperature plasma reaction device (3) comprises a secondary plasma power supply (11) and a secondary plasma generator (12);
the secondary plasma power supply (11) is electrically connected with the secondary plasma generator (12), and two ends of the secondary plasma generator (12) are respectively communicated with the second heat exchanger (7) and the SCR denitration device (4).
5. The desulfurization and denitrification system according to claim 4, wherein the primary plasma power supply (9) and the secondary plasma power supply (11) are any one of direct current, alternating current or pulsed discharge.
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| CN111389190A (en) * | 2020-04-17 | 2020-07-10 | 大唐环境产业集团股份有限公司 | Plasma-based ship tail gas desulfurization and denitrification system and method |
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| CN111389190B (en) * | 2020-04-17 | 2024-02-09 | 大唐环境产业集团股份有限公司 | Plasma-based ship tail gas desulfurization and denitrification system and method |
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