CN106237802A - A kind of post-processing approach of ship tail gas - Google Patents

A kind of post-processing approach of ship tail gas Download PDF

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Publication number
CN106237802A
CN106237802A CN201610646338.3A CN201610646338A CN106237802A CN 106237802 A CN106237802 A CN 106237802A CN 201610646338 A CN201610646338 A CN 201610646338A CN 106237802 A CN106237802 A CN 106237802A
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China
Prior art keywords
tail gas
ship tail
denitration
desulfurization
tower
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CN201610646338.3A
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Chinese (zh)
Inventor
石瑞
张国孟
邓军
夏亮
王逸
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SHANGHAI HENGYUAN MARINE EQUIPMENT CO Ltd
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SHANGHAI HENGYUAN MARINE EQUIPMENT CO Ltd
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Priority to CN201610646338.3A priority Critical patent/CN106237802A/en
Publication of CN106237802A publication Critical patent/CN106237802A/en
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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
    • B01D53/75—Multi-step processes
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/304—Alkali metal compounds of sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/204—Alkaline earth metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases

Abstract

The post-processing approach of a kind of ship tail gas of the present invention, the tail gas that boats and ships produce is passed through desulphurization denitration comprehensive tower, at the bottom of tower sodium hydroxide solution Absorption Desulfurization, on the top of tower with complex liquid complexation denitration, after desulphurization denitration processes, the heated heel row of standard compliant flue gas goes out chimney；Complex liquid after complexation NO is heated parses NO；The NO that heating parses is aoxidized by catalysis or plasma oxygen turns to NO2 and then absorbs with sodium hydroxide solution or sodium sulfite solution.When boats and ships use the low sulfur oil meeting IMO pact, it is not necessary to desulfurization, sodium alkali desulfurization section spray liquid is switched to sea water, prevent tower body temperature too high flue gas cooling.When boats and ships are when need not the navigation of denitration region, denitration section complex liquid spray system being closed, after the heated intensification of flue gas, is expelled directly out chimney.Present invention achieves NOX separation and concentration from tail gas, improve the concentration of NOx, improve catalysis oxidation and the conversion ratio of plasma oxidation.

Description

A kind of post-processing approach of ship tail gas
Technical field
The invention belongs to chemical field, relate to the processing method of ship tail gas, after a kind of ship tail gas Processing method.
Background technology
Along with discharge limitation standard and the ECA region of expanding day of IMO increasingly stringent, cover Main Trade state of China Family, the International Trade Transportation undertaking China's boats and ships creates strong influence.In order to continue to play boats and ships in national economy and Important function in foreign trade, it is necessary to research and development environmental protection, the ship tail gas discharging processing device of low energy consumption.
Boats and ships desulfurization at present mainly uses sodium alkali desulfurization, and denitration mainly uses SCR method, during both process integrations Occur in that some problems, low sulfur oil can only be used when mainly using SCR method denitration, although need not desulfurizer, but Fuel cost can be increased；Ship tail gas temperature is relatively low simultaneously, can affect the catalytic capability of SCR catalyst, although have been developed over Low-temperature SCR catalyst, but SO during low temperature in flue gas3Can be with unreacted NH3Generate ammonium hydrogen sulfate, ammonium hydrogen sulfate viscosity Very big, catalyst surface can be attached to, reduce the activity of catalyst, block duct, cause catalyst life to reduce；Ship tail gas In flying dust etc. also can wash away catalyst, cause catalyst abrasion, also can blocking catalyst, need periodically purging.These problems The most also there is no good solution.
Research and develop new and effective, the integration desulfurization denitration processing system device of low energy consumption, be also to realize " to the year two thousand twenty, entirely Face is grasped large ship environment protecting and power-saving and is reduced discharging the R & D design manufacturing capacity of new technique and high-end boats and ships and relevant equipment, shape Becoming brand ship type, standard ship and the series ship typ of series international most advanced level, every technical performance index is not less than international first Water inlet is flat；Carry out the beforehand research of a few type next generation's ships that transport, and make a breakthrough " the only way which must be passed of target.
Summary of the invention
For above-mentioned technical problem of the prior art, the invention provides the post-processing approach of a kind of vessel exhaust, described The post-processing approach of this ship tail gas to solve that low-temperature SCR catalyst of the prior art catalysis activity is low, the life-span is short, only The technical problem of low sulfur oil can be used.
The invention provides the post-processing approach of a kind of ship tail gas,
Comprise the steps: when ship tail gas needs desulphurization denitration
1) step by ship tail gas desulfurization, inputs the bottom of desulphurization denitration comprehensive tower, at desulphurization denitration by ship tail gas The bottom of comprehensive tower SOx in sodium hydroxide solution spray-absorption ship tail gas, forms desulfurization waste liquor；
2) step processing desulfurization waste liquor, completes desulfurization waste liquor by desulfurization waste liquor through flocculation, flotation, filtration step Purification, the NO in the follow-up ship tail gas of the sodium sulfite solution body after purification2The absorption of gas；The boats and ships that will be retained down Entered lung particulate matter in tail gas, heavy metal, polycyclic aromatic hydrocarbon store；
3) step that ship tail gas carries out denitration, inputs the upper of desulphurization denitration comprehensive tower by the ship tail gas after desulfurization Portion, adds complex liquid, the boats and ships after complex liquid complexed absorption desulfurization described in employing in the ship tail gas after described desulfurization NOx in tail gas, flue gas up to standard heated intensification heel row goes out chimney；
4) step adding Thermal desorption, is heated to the absorbing liquid of complexation NOx about 60 ~ 90 degree and parses NO；
5) step of NO oxidation, the NO parsed aoxidizes by catalyst or 30 at a temperature of 150 ~ 400 degree ~ It is oxidized to NO by corona discharge plasma equipment at a temperature of 100 degree2；
6) NO2The step absorbed, the NO that oxidation generates2At NO2By the sodium hydroxide solution of 0.01 ~ 1mol/L in absorption tower Or step 2) sodium sulfite solution that obtains absorbs, if absorbing with sodium hydroxide solution, needs the nitrate evaporation knot that will generate Brilliant storage, if absorbing with sodium sulfite solution, reacts the N of generation2Can be expelled directly out with sodium sulfate；
Comprise the steps: when ship tail gas needs independent desulfurization
1) step by ship tail gas desulfurization, inputs the bottom of desulphurization denitration comprehensive tower, at desulphurization denitration by ship tail gas The bottom of comprehensive tower SOx in sodium hydroxide solution spray-absorption ship tail gas, forms desulfurization waste liquor, the heated intensification of flue gas After be expelled directly out chimney；
2) step processing desulfurization waste liquor, completes desulfurization waste liquor by desulfurization waste liquor through flocculation, flotation, filtration step Purification, the sodium sulfite solution body after purification be used for follow-up NO2The absorption of gas；In the ship tail gas that will be retained down can Enter lung particulate matter, heavy metal, polycyclic aromatic hydrocarbon store；
3) spray system of denitration section complex liquid in desulphurization denitration comprehensive tower is closed；
Comprise the steps: when ship tail gas needs independent denitration
1) ship tail gas is inputted the bottom of desulphurization denitration comprehensive tower, at the bottom seawater spraying of desulphurization denitration comprehensive tower；
2) step that ship tail gas carries out denitration, will input desulphurization denitration comprehensive tower with the ship tail gas after seawater spraying Top, described with adding complex liquid in the ship tail gas after seawater spraying, the complex liquid complexed absorption described in employing is used The NOx in ship tail gas after seawater spraying, flue gas up to standard heated intensification heel row goes out chimney；
3) step adding Thermal desorption, is heated to 60 ~ 90 degree by the absorbing liquid of complexation NOx and parses NO；
4) step of NO oxidation, the NO parsed aoxidizes by catalyst or 30 at a temperature of 150 ~ 400 degree ~ It is oxidized to NO by corona discharge plasma equipment at a temperature of 100 degree2；
5) NO2The step absorbed, the NO that oxidation generates2At NO2In absorption tower by 0.01 ~ 1mol/L sodium hydroxide solution or The sodium sulfite solution obtained during desulfurization absorbs, if absorbing with sodium hydroxide solution, needs the nitrate evaporation crystallization that will generate Storing, if absorbing with sodium sulfite solution, reacting the N of generation2Can be expelled directly out with sodium sulfate.
Further, described plasma is a kind of corona discharge device, and the living radical of generation has oxidisability, NO can be oxidized to NO2。
Further, when ship tail gas needs desulphurization denitration, in step 6), unreacted NO gas returns desulphurization denitration The bottom of comprehensive tower proceeds the process of desulphurization denitration.
Further, when ship tail gas needs desulphurization denitration, added the complex liquid of the inefficacy after Thermal desorption by step 4) With iron powder or iron filings by complex liquid reducing/regenerating, the complex liquid after having regenerated returns to continue in step 3) complexed absorption NOx.
Further, if absorbing, with sodium hydroxide solution, the NO that oxidation generates2Then the oxygenation efficiency of NO only need to reach 40 ~ 60% ?.
Further, if absorbing, with sodium sulfite solution, the NO that oxidation generates2Then the oxygenation efficiency of NO need to reach 90% with On.
Further, desulphurization denitration segmentation in an absorption tower completes, and desulfurization completes in the bottom of comprehensive tower, and denitration exists The top of comprehensive tower completes, and centre liquid collecting bucket separates, and liquid collecting bucket is for collecting the complex liquid on top.Prevent complex liquid from leaking simultaneously Enter tower bottom to mix with soda solution.
Further, step 2) in the process of desulfurization waste liquor divide both of which to run, when boats and ships need denitration, desulfurization is given up Liquid completes the purification of desulfurization waste liquor through flocculation, flotation, filtration step, and the liquid after purification contains sodium sulfite, for follow-up NO2 The absorption of gas；When boats and ships need not denitration, desulfurization waste liquor completes the purification of desulfurization waste liquor through flocculation, flotation, filtration step, Then with air, the sodium sulfite in desulfurization waste liquor is oxidized to sodium sulfate and discharges hull.
Further, described catalyst comprises rare earth metal, alkaline-earth metal and transition metal.
Concrete, described catalyst is prior art, can be a kind of ABO3Type perovskite composite oxide is catalyzed Agent.A in this kind of rare earth catalyst represents rare earth metal or alkaline-earth metal (such as La, Ce, Ca, Sr), B represent transition metal (as Mn, Fe, Co), such as LaMnO3。ABO3The perovskite-type rare-earth composite oxides catalyst of type structure is in the purification of vehicle exhaust It is applied with in the combustion process of industrial waste gas.
Above-mentioned catalyst can also be simple metal composite oxide catalysts, the binary metal oxidation being widely studied at present Thing is most with Co and Mn as main active component, and typical catalyst therein has MnOx-CeO2、MnOx-TiO2And CoOx-SiO2。
Aftertreatment technology route of the present invention can be different different with operation area, in independent desulfurization, independent denitration according to fuel oil And switch between integration desulfurization denitration Three models.Individually desulphation mode: when boats and ships use high-sulfur oils need not denitration region Denitration section complex liquid spray system can be closed when running in territory, and flue gas is expelled directly out cigarette after desulfurization section processes after heat temperature raising Chimney.Individually denitration pattern: when boats and ships use the low sulfur oil meeting IMO pact, it is not necessary to desulfurization, sodium alkali desulfurization section can be sprayed Liquid switches to sea water, prevents tower body temperature too high, if can be direct by flue gas need not denitration area operation flue gas cooling Outer row, if turning on complex liquid spray system at needs denitration area operation to carry out denitration process.Integration desulfurization denitration mould Formula: when boats and ships use high-sulfur oils when needing desulphurization denitration area operation at the bottom soda solution Absorption Desulfurization of tower, at tower Top complex liquid complexation denitration, after desulphurization denitration process, meet the heated heel row of flue gas of discharge standard go out chimney.
The invention provides a kind of vessel motion and meet the solution of IMO pact Tier III standard, continue to make at boats and ships With the heavy oil of sulfur-bearing more than 3% or when using low sulfur oil, can meet requirements of convention, boats and ships are produced by concrete technology method Tail gas is passed through desulphurization denitration comprehensive tower, in the bottom of tower with soda solution Absorption Desulfurization, takes off with complex liquid complexation on the top of tower Nitre, the heated heel row of flue gas meeting discharge standard after desulphurization denitration processes goes out chimney；Complex liquid warp after complexation NO Heating parses NO, and then complex liquid iron powder or iron filings regenerate, and the complex liquid after having regenerated returns denitrating system to be continued Complexed absorption NOx；The NO that heating parses is aoxidized by catalysis or corona discharge plasma equipment is oxidized to NO2Then hydrogen is used Sodium hydroxide solution or sodium sulfite solution absorb.When boats and ships use and meet the low sulfur oil of IMO pact, it is not necessary to desulfurization, can be by Sodium alkali desulfurization section spray liquid switches to sea water, prevents tower body temperature too high flue gas cooling.When boats and ships need not denitration region During navigation, denitration section complex liquid spray system can be closed, after the heated intensification of flue gas, be expelled directly out chimney.
Main advantages of the present invention are as follows:
(1) aftertreatment technology route of the present invention can be different different with operation area according to fuel oil, independent desulfurization, independent denitration and Switch between integration desulfurization denitration Three models.
(2) present invention can make boats and ships be continuing with high-sulfur oils, reduces operating cost.
(3) present invention uses sodium alkali desulfurization and wet process complex denitration, and reaction condition is gentle, relatively low to the requirement ratio of equipment.
(4) sodium alkali desulfurization technique of the present invention uses closed cycle technique, to the PM in desulfurization wastewater, heavy metal, many The harmful substances such as PAH process and store, not discharge harmful in ocean.
(5) chelating agent used by the present invention is cheap and can be recycled, and one time input cost is low.
(6) mode that then chelating agent complexed absorption NOx of the present invention adds Thermal desorption achieves NOx separation richness from tail gas Collection, improves the concentration of NOx, improves catalysis oxidation and the conversion ratio of plasma oxidation, reduces the power consumption of reactor.
The present invention compares with prior art, and its technological progress is significant.A kind of ship tail gas post processing of the present invention takes off The method of sulfur denitration can make boats and ships be continuing with high-sulfur oils, reduces operating cost, it is possible to use low sulfur oil, but once throws Entering cost, to compare SCR method denitration much lower.This technique does not use Ammonia material simultaneously, does not haves the danger such as ammonia leakage.
Accompanying drawing explanation
Fig. 1 is the flow chart of the post-processing approach of a kind of ship tail gas of the present invention.
Detailed description of the invention
As it is shown in figure 1, the invention provides the post-processing approach of a kind of ship tail gas, comprise the steps:
Comprise the steps: when ship tail gas needs desulphurization denitration
1) step by ship tail gas desulfurization, inputs the bottom of desulphurization denitration comprehensive tower, at desulphurization denitration by ship tail gas The bottom of comprehensive tower sodium hydroxide solution spray-absorption SOx, forms desulfurization waste liquor；
2) step processing desulfurization waste liquor, completes desulfurization by desulfurization waste liquor wash through flocculation, flotation, filtration step Washing water purification, the sodium sulfite solution body after purification is used for follow-up NO2The absorption of gas；In the ship tail gas that will be retained down Entered lung particulate matter, heavy metal, polycyclic aromatic hydrocarbon store；
3) step that ship tail gas carries out denitration, inputs the upper of desulphurization denitration comprehensive tower by the ship tail gas after desulfurization Portion, (EDTA of 0.01 ~ 0.05mol/L closes ferrum complex liquid or EDTA to add complex liquid in the ship tail gas after described desulfurization Close cobalt complex liquid), the NOx in the ship tail gas after complex liquid complexed absorption desulfurization described in employing, flue gas up to standard is heated Intensification heel row goes out chimney；
4) step adding Thermal desorption, is heated to the absorbing liquid of complexation NOx about 60 ~ 90 degree and parses NO；
5) step of a NO oxidation, the NO parsed is produced by Catalyst Factory, Nankai Univ under 150 ~ 400 degree of high temperature LaFeCoO3Catalyst aoxidizes or is oxidized to NO by corona discharge plasma equipment under 30 ~ 100 degree of low temperature2；(wait from Daughter is a kind of corona discharge device, and the living radical of generation has oxidisability, NO can be oxidized to NO2)
6) NO2The step absorbed, the NO that oxidation generates2At NO2By sodium hydroxide solution or step 2 in absorption tower) obtain Sodium sulfite solution absorb, if with sodium hydroxide solution absorb; need will generate nitrate evaporation crystallization store, if use Sodium sulfite solution absorbs the N then reacting generation2Can be expelled directly out with sodium sulfate.
Comprise the steps: when ship tail gas needs independent desulfurization
1) step by ship tail gas desulfurization, inputs the bottom of desulphurization denitration comprehensive tower, at desulphurization denitration by ship tail gas The bottom of comprehensive tower sodium hydroxide solution spray-absorption SOx, forms desulfurization waste liquor, is expelled directly out cigarette after the heated intensification of flue gas Chimney；
2) step processing desulfurization waste liquor, completes desulfurization washing by desulfurization waste liquor through flocculation, flotation, filtration step Water purification, the sodium sulfite solution body after purification is used for follow-up NO2The absorption of gas；In the ship tail gas that will be retained down Can enter lung particulate matter, heavy metal, polycyclic aromatic hydrocarbon store；
3) spray system of denitration section complex liquid in desulphurization denitration comprehensive tower is closed；
Comprise the steps: when ship tail gas needs independent denitration
1) ship tail gas is inputted the bottom of desulphurization denitration comprehensive tower, at the bottom seawater spraying of desulphurization denitration comprehensive tower；
2) step that ship tail gas is carried out denitration, comprehensive by inputting desulphurization denitration with the ship tail gas after seawater spraying The top of tower, described, with adding complex liquid in the ship tail gas after seawater spraying, (EDTA of 0.01 ~ 0.05mol/L closes ferrum Complex liquid or EDTA close cobalt complex liquid), in the ship tail gas after complex liquid complexed absorption seawater spraying described in employing NOx, flue gas up to standard heated intensification heel row goes out chimney；
3) step adding Thermal desorption, is heated to the absorbing liquid of complexation NOx about 60 ~ 90 degree and parses NO；
4) step of a NO oxidation, the NO parsed is produced by Catalyst Factory, Nankai Univ under 150 ~ 400 degree of high temperature LaFeCoO3Catalyst aoxidizes or is oxidized to NO by corona discharge plasma equipment under 30 ~ 100 degree of low temperature2；
5) NO2The step absorbed, the NO that oxidation generates2At NO2Obtain time in absorption tower by sodium hydroxide solution or desulfurization Sodium sulfite solution absorb, if with sodium hydroxide solution absorb; need will generate nitrate evaporation crystallization store, if use Sodium sulfite solution absorbs the N then reacting generation2Can be expelled directly out with sodium sulfate.
Further, in step 6) unreacted NO gas return desulphurization denitration comprehensive tower bottom proceed desulfurization take off The process of nitre.
Further, add the complex liquid iron powder of the inefficacy after Thermal desorption or iron filings by step 4) to be reduced again by complex liquid Raw, the complex liquid after having regenerated returns to continue in step 3) complexed absorption NOx.
Further, if absorbing, with sodium hydroxide solution, the NO that oxidation generates2Then the oxygenation efficiency of NO only need to reach 40 ~ 60% ?.
Further, if absorbing, with sodium sulfite solution, the NO that oxidation generates2Then the oxygenation efficiency of NO need to reach 90% with On.
Further, desulphurization denitration segmentation in an absorption tower completes, and desulfurization completes in the bottom of comprehensive tower, and denitration exists The top of comprehensive tower completes, and centre liquid collecting bucket separates, and liquid collecting bucket is for collecting the complex liquid on top.Prevent complex liquid from leaking simultaneously Enter tower bottom to mix with soda solution.
Further, step 2) in the process of desulfurization waste liquor divide both of which to run, when boats and ships need denitration, desulfurization is given up Liquid completes the purification of desulfurization waste liquor through flocculation, flotation, filtration step, and the liquid after purification contains sodium sulfite, for follow-up NO2 The absorption of gas；When boats and ships need not denitration, desulfurization waste liquor completes the purification of desulfurization waste liquor through flocculation, flotation, filtration step, Then with air, the sodium sulfite in desulfurization waste liquor is oxidized to sodium sulfate and discharges hull.

Claims (8)

1. the post-processing approach of a ship tail gas, it is characterised in that:
Comprise the steps: when ship tail gas needs desulphurization denitration
1) step by ship tail gas desulfurization, inputs the bottom of desulphurization denitration comprehensive tower, at desulphurization denitration by ship tail gas The bottom of comprehensive tower SOx in sodium hydroxide solution spray-absorption ship tail gas, forms desulfurization waste liquor；
2) step processing desulfurization waste liquor, completes desulfurization waste liquor by desulfurization waste liquor through flocculation, flotation, filtration step Purification, the NO in the follow-up ship tail gas of the sodium sulfite solution body after purification2The absorption of gas；The boats and ships that will be retained down Entered lung particulate matter in tail gas, heavy metal, polycyclic aromatic hydrocarbon store；
3) step that ship tail gas carries out denitration, inputs the upper of desulphurization denitration comprehensive tower by the ship tail gas after desulfurization Portion, adds complex liquid, the boats and ships after complex liquid complexed absorption desulfurization described in employing in the ship tail gas after described desulfurization NOx in tail gas, flue gas up to standard heated intensification heel row goes out chimney；
4) step adding Thermal desorption, is heated to the absorbing liquid of complexation NOx about 60 ~ 90 degree and parses NO；
5) step of NO oxidation, the NO parsed aoxidizes by catalyst or 30 at a temperature of 150 ~ 400 degree ~ It is oxidized to NO by corona discharge plasma equipment at a temperature of 100 degree2；
6) NO2The step absorbed, the NO that oxidation generates2At NO2By the sodium hydroxide solution of 0.01 ~ 1mol/L in absorption tower Or step 2) sodium sulfite solution that obtains absorbs, if absorbing with sodium hydroxide solution, needs the nitrate evaporation knot that will generate Brilliant storage, if absorbing with sodium sulfite solution, reacts the N of generation2Can be expelled directly out with sodium sulfate；
Comprise the steps: when ship tail gas needs independent desulfurization
1) step by ship tail gas desulfurization, inputs the bottom of desulphurization denitration comprehensive tower, at desulphurization denitration by ship tail gas The bottom of comprehensive tower SOx in sodium hydroxide solution spray-absorption ship tail gas, forms desulfurization waste liquor, the heated intensification of flue gas After be expelled directly out chimney；
2) step processing desulfurization waste liquor, completes desulfurization waste liquor by desulfurization waste liquor through flocculation, flotation, filtration step Purification, the sodium sulfite solution body after purification be used for follow-up NO2The absorption of gas；In the ship tail gas that will be retained down can Enter lung particulate matter, heavy metal, polycyclic aromatic hydrocarbon store；
3) spray system of denitration section complex liquid in desulphurization denitration comprehensive tower is closed；
Comprise the steps: when ship tail gas needs independent denitration
1) ship tail gas is inputted the bottom of desulphurization denitration comprehensive tower, at the bottom seawater spraying of desulphurization denitration comprehensive tower；
2) step that ship tail gas carries out denitration, will input desulphurization denitration comprehensive tower with the ship tail gas after seawater spraying Top, described with adding complex liquid in the ship tail gas after seawater spraying, the complex liquid complexed absorption described in employing is used The NOx in ship tail gas after seawater spraying, flue gas up to standard heated intensification heel row goes out chimney；
3) step adding Thermal desorption, is heated to 60 ~ 90 degree by the absorbing liquid of complexation NOx and parses NO；
4) step of NO oxidation, the NO parsed aoxidizes by catalyst or 30 at a temperature of 150 ~ 400 degree ~ It is oxidized to NO by corona discharge plasma equipment at a temperature of 100 degree2；
5) NO2The step absorbed, the NO that oxidation generates2At NO2In absorption tower by 0.01 ~ 1mol/L sodium hydroxide solution or The sodium sulfite solution obtained during desulfurization absorbs, if absorbing with sodium hydroxide solution, needs the nitrate evaporation crystallization that will generate Storing, if absorbing with sodium sulfite solution, reacting the N of generation2Can be expelled directly out with sodium sulfate.
The post-processing approach of a kind of ship tail gas the most according to claim 1, it is characterised in that: when ship tail gas needs de- During sulfur denitration, in step 6), the bottom of unreacted NO gas return desulphurization denitration comprehensive tower proceeds the mistake of desulphurization denitration Journey.
The post-processing approach of a kind of ship tail gas the most according to claim 1, it is characterised in that: when ship tail gas needs de- During sulfur denitration, add the complex liquid iron powder of the inefficacy after Thermal desorption or iron filings by complex liquid reducing/regenerating, regeneration by step 4) Complex liquid after completing returns to continue in step 3) complexed absorption NOx.
The post-processing approach of a kind of ship tail gas the most according to claim 1, it is characterised in that: if using sodium hydroxide solution Absorb the NO that oxidation generates2Then the oxygenation efficiency of NO only need to reach 40 ~ 60%.
The post-processing approach of a kind of ship tail gas the most according to claim 1, it is characterised in that: if using sodium sulfite solution Absorb the NO that oxidation generates2Then the oxygenation efficiency of NO needs to reach more than 90%.
The post-processing approach of a kind of ship tail gas the most according to claim 1, it is characterised in that: desulphurization denitration is a suction In receiving tower, segmentation completes, and desulfurization completes in the bottom of comprehensive tower, and denitration completes on the top of comprehensive tower, and centre liquid collecting bucket divides Every, liquid collecting bucket is for collecting the complex liquid on top.
The post-processing approach of a kind of ship tail gas the most according to claim 1, it is characterised in that: step 2) in desulfurization waste liquor Process divide both of which to run, when boats and ships need denitration, desulfurization waste liquor completes desulfurization give up through flocculation, flotation, filtration step The purification of liquid, the liquid after purification contains sodium sulfite, for follow-up NO2The absorption of gas；When boats and ships need not denitration, de- Sulfur waste liquid completes the purification of desulfurization waste liquor through flocculation, flotation, filtration step, then with air by the sodium sulfite in desulfurization waste liquor It is oxidized to sodium sulfate and discharges hull.
The post-processing approach of a kind of ship tail gas the most according to claim 1, it is characterised in that: described catalyst wraps Include dilute rare earth metal, alkaline-earth metal and transition metal.
CN201610646338.3A 2016-08-09 2016-08-09 A kind of post-processing approach of ship tail gas Pending CN106237802A (en)

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Application publication date: 20161221