CN103349902B - Flue gas processing method - Google Patents

Flue gas processing method Download PDF

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CN103349902B
CN103349902B CN201310237113.9A CN201310237113A CN103349902B CN 103349902 B CN103349902 B CN 103349902B CN 201310237113 A CN201310237113 A CN 201310237113A CN 103349902 B CN103349902 B CN 103349902B
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zinc oxide
flue gas
sulfur dioxide
slurries
oxide slurries
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CN103349902A (en
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魏甲明
刘君
王姣
岳焕玲
陈芳
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China ENFI Engineering Corp
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China ENFI Engineering Corp
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Abstract

The invention provides a flue gas processing method. Flue gas comprises sulfur dioxide. The method comprises the steps that: zinc oxide particles are prepared into slurry, such that zinc oxide slurry is obtained; the zinc oxide slurry is used for processing the flue gas comprising sulfur dioxide, such that sulfur dioxide in the flue gas can be absorbed, wherein the zinc oxide slurry is subjected to countercurrent contact with the flue gas comprising sulfur dioxide with a spraying manner. With the method, equipment blockage can be effectively avoided, and high sulfur-removing rate can be achieved.

Description

Flue gas processing method
Technical field
The present invention relates to chemical field, concrete, the present invention relates to flue gas processing method.
Background technology
Current employing zinc oxide method except sulfur dioxide in flue gas example be not a lot, the absorption tower of current employing mostly is tubulent contact tower, high energy scrubber, DS-heterophase reactor etc., these absorption plants some closed or rectification, some also runs in maintenance, these devices operating also frequently break down, be difficult to maintenance runs well, and treatment effeciency obviously reduces.
Therefore, further improvement is need for the zinc oxide method removing method of sulfur dioxide in flue gas and equipment thereof.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.For this reason, one object of the present invention is to provide a kind of flue gas processing method, this equipment has the fume treatment auxiliary of hollow-spraying-tower structure, this equipment can absorb the sulfur dioxide gas in flue gas effectively, effectively can overcome the shortcoming that other equipment are easy to block, higher desulfuration efficiency can be reached simultaneously.
Thus, in one aspect of the invention, the present invention proposes a kind of flue gas processing method.According to embodiments of the invention, the method comprises: Zinc oxide particles is carried out process of sizing mixing, to obtain zinc oxide slurries; Utilize described zinc oxide slurries to process the flue gas containing sulfur dioxide, to absorb the sulfur dioxide in described flue gas, wherein, described zinc oxide slurries adopt spray mode to contact with the described flue gas adverse current containing sulfur dioxide.Utilize the method can effectively reach the object removed sulfur dioxide in flue gas, at utmost reduce blocking, to reach higher desulfuration efficiency further.
In addition, the method for fume treatment according to the abovementioned embodiments of the present invention can also have following additional technical feature:
According to embodiments of the invention, said method comprises further: repeatedly carry out desulfurization process, to prepare multiple byproduct to the described flue gas containing sulfur dioxide.
According to embodiments of the invention, the concentration of sulfur dioxide in flue gas is for being greater than 1000mg/Nm 3.According to embodiments of the invention, the zinc oxide content of described zinc oxide slurries is 5 ~ 30 % by weight.According to embodiments of the invention, the particle mean size of the solid particle in described zinc oxide slurries is 150 ~ 400 orders.Higher desulfuration efficiency can be reached thus.
According to embodiments of the invention, by described zinc oxide slurries with containing the flue gas of sulfur dioxide with 6 ~ 40L/m 3liquid-gas ratio carry out absorption process.Higher desulfuration efficiency can be reached thus.
According to embodiments of the invention, described zinc oxide slurries contact with the described flue gas adverse current containing sulfur dioxide in the mode of Multi-layer sprinkling.The time of contact of zinc oxide slurries and flue gas can be extended thus to greatest extent, make fully to react both it, to improve desulfuration efficiency further.
According to embodiments of the invention, comprise further: under the condition that there is oxygen, make described zinc oxide slurries and described smoke contacts.According to embodiments of the invention, described oxygen provides in the form of air.Oxygen can be provided thus, to reach the object preparing different byproduct for desulfurization environment.
According to embodiments of the invention, comprise further: demist process is carried out to described zinc oxide slurries and the droplet that exists in the environment of the smoke contacts containing sulfur dioxide.
Conveniently understand the method for above-mentioned sulfur dioxide absorption from flue gas, below the system implementing said method is described.
According to embodiments of the invention, implement the system of said method and comprise: pulping device, described pulping device is suitable for sizing mixing process to Zinc oxide particles, to obtain zinc oxide slurries; Apparatus for absorbing SO 2, described apparatus for absorbing SO 2 is connected with described pulping device, for utilizing described zinc oxide slurries, the flue gas containing sulfur dioxide is processed, to absorb the sulfur dioxide in described flue gas, wherein, described apparatus for absorbing SO 2 comprises: absorption plant body, limits sulfur dioxide and absorb space in described absorption plant body; Spray thrower, described spray thrower is arranged on described sulfur dioxide and absorbs in space, and is connected with described pulping device, sprays described zinc oxide slurries for absorbing in space to described sulfur dioxide; Smoke inlet, described smoke inlet is arranged on described absorption plant body, for absorbing in space the flue gas introduced containing sulfur dioxide to described sulfur dioxide, wherein, described spray thrower and smoke inlet are configured to, described zinc oxide slurries at least partially with described flue gas at least partially in counter current contacting.
Above-mentioned fume treatment auxiliary is utilized can effectively to reach the object removed sulfur dioxide in flue gas, especially the sulfur dioxide utilizing this equipment to have appropriate size absorbs space, employing hollow-spraying-tower designs, at utmost reduce blocking on the one hand, spray column resistance is low on the other hand, the drag losses of gas also greatly reduces, and can reach higher desulfuration efficiency simultaneously.Spray thrower in the said equipment makes zinc oxide slurries contact with flue gas in the mode of spray, and, by the position of the position and smoke inlet that arrange spray thrower, make the zinc oxide slurries spraying out from spray thrower can carry out counter current contacting with flue gas to greatest extent, the reaction time of sulfur dioxide in flue gas and zinc oxide can be improved thus, to improve desulfuration efficiency further.
According to embodiments of the invention, along the axial direction of described apparatus for absorbing SO 2, described spray thrower is arranged on the top of described smoke inlet.The time of contact of zinc oxide slurries and flue gas can be extended thus to greatest extent.
According to embodiments of the invention, described spray thrower is Multi-layer sprinkling plate structure.Zinc oxide slurries can be made thus to contact with flue gas fully.
According to embodiments of the invention, described apparatus for absorbing SO 2 comprises further: demister, and described demister is arranged on described sulfur dioxide and absorbs in space.The droplet that can reduce slurries is thus carried secretly.
According to embodiments of the invention, along the axial direction of described apparatus for absorbing SO 2, described demister is arranged on the below of described smoke inlet.Demist can be carried out, to improve the treatment effeciency of flue gas thus to the zinc oxide slurries after sulfur dioxide absorption.
According to embodiments of the invention, described demister is deflection plate.Demisting efficiency can be improved further thus.
According to embodiments of the invention, comprise multiple apparatus for absorbing SO 2 of series connection.Low ph value gradient can be realized thus control.
According to embodiments of the invention, above-mentioned fume treatment auxiliary can also comprise: filter-pressing device, described filter-pressing device is connected with apparatus for absorbing SO 2, for carrying out press filtration process, to obtain filter cake and filtrate to the zinc oxide slurries through contacting with described flue gas adverse current.The follow-up work of fume treatment can be completed thus further.
According to embodiments of the invention, described filter-pressing device is also connected with pulping device, to size mixing process described in described filtrate being used for.Can making full use of filtrate be improved thus, avoid the wasting of resources.
According to embodiments of the invention, described apparatus for absorbing SO 2 can also comprise: oxygen intake, and described oxygen intake is arranged on described absorption plant body, for absorbing oxygen gas-supplying in space to described sulfur dioxide.According to embodiments of the invention, described oxygen provides in the form of air.Oxygen can be provided thus, to reach the object preparing different byproduct for desulfurization environment.
According to embodiments of the invention, the granularity of described Zinc oxide particles is 150 ~ 400 orders.Higher desulfuration efficiency can be reached further thus.
According to embodiments of the invention, the solid content of described zinc oxide slurries is 5 ~ 30 % by weight.Higher desulfuration efficiency can be reached thus.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the structural representation of smoke processing system according to an embodiment of the invention.
Fig. 2 is the structural representation of smoke processing system according to an embodiment of the invention.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Below, flue gas processing method according to the present invention is described:
According to one embodiment of present invention, the present invention proposes a kind of flue gas processing method, wherein, containing sulfur dioxide in pending flue gas, the method for smoke treatment can comprise particularly: Zinc oxide particles is carried out process of sizing mixing, to obtain zinc oxide slurries; Described zinc oxide slurries are utilized to process the flue gas containing sulfur dioxide, to absorb the sulfur dioxide in described flue gas, wherein, described zinc oxide slurries adopt spray mode to contact with the described flue gas adverse current containing sulfur dioxide, can reach higher desulfuration efficiency thus.
According to one embodiment of present invention, said method comprises further: repeatedly carry out desulfurization process to the flue gas containing sulfur dioxide, to prepare multiple byproduct, repeatedly can carry out desulfurization process simultaneously, can improve desulfurized effect further.
According to one embodiment of present invention, the concentration of sulfur dioxide in flue gas is for being greater than 1000mg/Nm 3.According to embodiments of the invention, the zinc oxide content of described zinc oxide slurries is 5 ~ 30 % by weight.According to embodiments of the invention, the particle mean size of the solid particle in described zinc oxide slurries is 150 ~ 400 orders.Desulfurized effect can be improved thus by the content and granularity controlling effectively desulfurizing agent and zinc oxide in slurries, according to a particular embodiment of the invention, the less contact area that can improve zinc oxide and sulfur dioxide of grain graininess, can improve desulfuration efficiency thus further.
According to one embodiment of present invention, by described zinc oxide slurries with containing the flue gas of sulfur dioxide with 6 ~ 40L/m 3liquid-gas ratio carry out absorption process.Thus in guarantee absorption tower more than 200% absorption slurries coverage rate, the nozzle of spray thrower adopts specific form at utmost to reduce the generation of blocking, can improve desulfuration efficiency further thus.
According to one embodiment of present invention, described zinc oxide slurries contact with the described flue gas adverse current containing sulfur dioxide in the mode of Multi-layer sprinkling.The time of contact of zinc oxide slurries and flue gas can be extended thus to greatest extent, make fully to react both it, to improve desulfuration efficiency further.
According to one embodiment of present invention, said method comprises further: under the condition that there is oxygen, makes described zinc oxide slurries and described smoke contacts.According to embodiments of the invention, described oxygen provides in the form of air.Oxygen can be provided thus, to reach the object preparing different byproduct for desulfurization environment.According to a particular embodiment of the invention, according to the demand supplies oxidation air to byproduct, air lance is located on front side of side stir device, and the air sprayed into is blended into tiny bubble by the slurries that agitator promotes, and is scattered among slurries well; Oxygen and water-soluble after sulfur dioxide react and generate zinc sulfate, the content of oxygen can be controlled thus as required, different byproducts can be prepared.
According to one embodiment of present invention, comprise further: demist process is carried out to described zinc oxide slurries and the droplet that exists in the environment of the smoke contacts containing sulfur dioxide, so that the droplet reducing slurries is carried secretly, reduce slurries and to overflow the secondary environmental pollution caused with flue gas.
Conveniently understand the method for above-mentioned sulfur dioxide absorption from flue gas, utilize the system of said method to be described to enforcement below.
Conveniently understand, below with reference to Fig. 1-2, the system implementing said method is described.According to a particular embodiment of the invention, the system implementing said method specifically comprises: pulping device 100 and apparatus for absorbing SO 2 200, apparatus for absorbing SO 2 200 is connected with pulping device 100.
According to a particular embodiment of the invention, pulping device 100 is suitable for sizing mixing process to Zinc oxide particles, to obtain zinc oxide slurries, described zinc oxide slurries are used for adsorbing the sulfur dioxide in flue gas.According to a particular embodiment of the invention, the zinc oxide slurries that apparatus for absorbing SO 2 200 utilizes above-mentioned pulping device 100 to prepare process the flue gas containing sulfur dioxide, to absorb the sulfur dioxide in flue gas.
The principle utilizing zinc oxide slurries to adsorb sulfur dioxide is particularly as follows: utilize the material containing zinc oxide to be mixed with zinc oxide and absorb slurries, contact in apparatus for absorbing SO 2 200 with containing sulfur dioxide flue gas, utilize the reaction of zinc oxide and sulfur dioxide, it is removed with the form of zinc sulfite and zinc sulfate.The approach that zinc sulfite is decomposed by thermal decomposition or acid reclaims sulfur dioxide and zinc oxide, and zinc sulfate can enter the electrolysis of zinc electrolysis workshop or evaporative crystallization obtains solid.The reaction equation of zinc oxide desulfurization is:
SO 2water-soluble: SO 2+ H 2o=HSO 3 -+ H +(1)
HSO 3 -=SO 3 2-+H +(2)
ZnO reacts: ZnO+2H +→ Zn 2++ H 2o (3)
Zn 2++SO 3 2-+5/2H 2O=ZnSO 3·5/2H 2O (4)
ZnSO 3·5/2H 2O+H +=Zn 2++HSO 3 -+5/2H 2O (5)
According to a particular embodiment of the invention, several reaction more than in apparatus for absorbing SO 2 200 all can occur, and as needed many production byproduct zinc sulfites, just need to strengthen reaction condition and making reaction (4) become main reaction, containing (5) reaction simultaneously.Realizing these reactions adopts which kind of technique, which kind of equipment to be all create suitable condition reaction is carried out to favourable direction, and improves reaction speed as far as possible, improves desulfuration efficiency.
According to a particular embodiment of the invention, the material containing zinc oxide is prepared into zinc oxide slurry by above-mentioned pulping device 100, and wherein, according to concrete example of the present invention, preparing zinc oxide content in zinc oxide slurry is 5 ~ 30 % by weight.According to a particular embodiment of the invention, the particle mean size of Zinc oxide particles is 150 ~ 400 orders, can improve desulfuration efficiency further thus.
According to one embodiment of present invention, apparatus for absorbing SO 2 200 can further include absorption plant body 210, limits sulfur dioxide and absorb space in absorption plant body 210.Therefore, zinc oxide slurries are utilized to remove the flue gas containing sulfur dioxide in sulfur dioxide space.Therefore this sulfur dioxide absorbs space is void tower structure, can block by avoiding device thus, can reach higher desulfuration efficiency simultaneously.
According to one embodiment of present invention, apparatus for absorbing SO 2 200 can further include spray thrower 220, spray thrower 220 is arranged on sulfur dioxide and absorbs in space, and is connected with pulping device 100, sprays zinc oxide slurries for absorbing in space to sulfur dioxide.
According to one embodiment of present invention, apparatus for absorbing SO 2 200 can further include smoke inlet 230, and smoke inlet 230 is arranged on absorption plant body, for absorbing in space the flue gas introduced containing sulfur dioxide to sulfur dioxide.According to a particular embodiment of the invention, spray thrower 220 and smoke inlet 230 are configured to, zinc oxide slurries at least partially with flue gas at least partially in counter current contacting.Zinc oxide slurries and the time of contact containing sulfur dioxide flue gas can be improved thus further, make it have time enough sufficient reacting, sulfur dioxide in flue gas can be removed to greatest extent thus, improve the removal efficiency of sulfur dioxide.
For this reason, according to a particular embodiment of the invention, as shown in Figure 1, can along the axial direction of apparatus for absorbing SO 2 100, spray thrower 220 is arranged on the top of smoke inlet 230.Flue gas to enter in apparatus for absorbing SO 2 100 from smoke inlet 230 and runs to the exhanst gas outlet 231 being arranged on device 100 top, downward spray zinc oxide slurries out from the spray thrower be arranged on above smoke inlet are run in process, flue gas and zinc oxide slurries are counter current contacting thus, zinc oxide slurries and the time of contact containing sulfur dioxide flue gas can be improved thus further, it is made to have time enough sufficient reacting, sulfur dioxide in flue gas can be removed to greatest extent thus, improve the removal efficiency of sulfur dioxide.
According to one embodiment of present invention, spray thrower 220, in Multi-layer sprinkling plate structure, can absorb in space to sulfur dioxide thus and spray enough zinc oxide slurries, fully to remove the sulfur dioxide in flue gas.According to a particular embodiment of the invention, the sulfur dioxide slurries that spray thrower 220 in Multi-layer sprinkling plate structure sprays can cover the horizontal area that whole sulfur dioxide absorbs space, can make thus flue gas can fully with zinc oxide slurry liquid contacts, to improve further the removal efficiency of sulfur dioxide.
According to one embodiment of present invention, the apparatus for absorbing SO 2 100 implementing said method can further include: demister 240, and demister 240 is arranged on sulfur dioxide and absorbs in space.The zinc oxide slurries after this demister 240 pairs of sulfur dioxide absorptions can be utilized thus to carry out demist, and according to a particular embodiment of the invention, demister 240 is arranged on the below of smoke inlet, to improve the treatment effeciency of flue gas.According to concrete example of the present invention, the particular type ratio of demister 240 is not particularly limited, as long as can defrosting function be had, according to concrete example of the present invention, demister 240 can be deflection plate, can improve except fog effect further thus, reduce the droplet of slurries and carry secretly, reduce slurries and to overflow the secondary environmental pollution caused with flue gas.
According to one embodiment of present invention, the fume treatment auxiliary implementing said method can comprise multiple apparatus for absorbing SO 2 200 of series connection.According to a particular embodiment of the invention, apparatus for absorbing SO 2 200 twin-stage or thtee-stage shiplock use can be set, realize low ph value gradient to control, different apparatus for absorbing SO 2 200 stresses difference in functionality, can reach the requirement meeting desulfuration efficiency and produce qualified byproduct simultaneously.The zinc sulfate concentration that the major function of first order absorption device is partial oxidation oxidation, concentrated filtrate reaches regulation, accelerating oxidation zinc dissolve and remove part sulfur dioxide, and therefore the intrasystem pH of this absorption plant is lower slightly, is conducive to the process being oxidized and dissolving; The major function of sponge oil unit is the assimilation effect ensureing sulfur dioxide, and meet the requirement of environmental protection, the pH value therefore in this device is slightly high, is conducive to the absorption process of sulfur dioxide from gas phase to liquid phase.
According to one embodiment of present invention, above-mentioned fume treatment auxiliary can also comprise: filter-pressing device 250, filter-pressing device 250 is connected with apparatus for absorbing SO 2 200, for carrying out press filtration process, to obtain filter cake and filtrate to the zinc oxide slurries through contacting with flue gas adverse current.The follow-up work of fume treatment can be completed thus further.
According to embodiments of the invention, filter-pressing device 250 is also connected with pulping device 100, to be sized mixing process filtrate being used for.Can making full use of filtrate be improved thus, avoid the wasting of resources.
According to embodiments of the invention, apparatus for absorbing SO 2 200 can further include oxygen intake 260, and oxygen intake 260 is arranged on absorption plant body, for absorbing oxygen gas-supplying in space to sulfur dioxide.According to embodiments of the invention, oxygen provides in the form of air.Oxygen can be provided thus, to reach the object preparing different byproduct for desulfurization environment.After passing into oxygen particularly, oxygen and Aqueous Solution of Sulfur Dioxide are obtained by reacting zinc sulfate.Concrete reaction is as follows:
Oxidation reaction: 2HSO 3 -+ O 2→ 2SO 4 2-+ 2H +(6)
ZnSO 3·5/2H 2O+1/2O 2→Zn 2++SO 4 2-+5/2H 2O (7)
Therefore, according to a particular embodiment of the invention, as needed many production byproduct zinc sulfate, just need to strengthen reaction condition and make reaction (6) and above-mentioned reaction (5) and become main reaction, contain above-mentioned (4) reaction simultaneously.Realizing these reactions adopts which kind of technique, which kind of equipment to be all create suitable condition reaction is carried out to favourable direction, and improves reaction speed as far as possible, improves desulfuration efficiency.
Conveniently understand the system of smoke treatment of the present invention, specifically describe below and utilize this fume treatment auxiliary to carry out processing the concrete operation step containing sulfur dioxide flue gas.
According to a particular embodiment of the invention, smoke processing system of the present invention is suitable for absorbing the SO in flue gas 2, can be used for 1000mg/Nm 3the sulfur dioxide flue gas of above concentration, especially 5000mg/Nm 3sulfur dioxide flue gas more than concentration is more applicable.
Absorbent situation analysis: in available zinc oxide, screen suitable zinc oxide absorbent, determine the designed breeding such as zinc oxide utilization rate, absorbent preparation concentration, tower entoplasm liquid controlled concentration, pipeline specifications according to the composition (purity is usually 40 ~ 80%) of selected zinc oxide absorbent, granularity (usually at 150 ~ 400 orders);
Slurrying: zinc oxide absorbent and water make certain density zinc oxide slurries in pulping device 100, for subsequent use in slurries preparation vessel transport pump to slurry tank.Fresh zinc oxide slurries are sent in apparatus for absorbing SO 2 200 for removing the sulfur dioxide gas in flue gas through slurry feeding pump, particularly, apparatus for absorbing SO 2 200 can adopt absorption tower, and the amount of supplementary fresh slurry can regulate according to pH value in absorption tower.
Absorb: according to a particular embodiment of the invention, apparatus for absorbing SO 2 200 can be the device 200 of multiple series connection, namely adopt double tower to carry out desulfurization process to flue gas with the apparatus for absorbing SO 2 200 of two series connection below.According to a particular embodiment of the invention, enter the middle part on the first absorption tower containing sulfur dioxide flue gas, the zinc oxide slurries counter current contacting sprayed with top of tower, after flue gas and slurry liquid contacts, flue-gas temperature reduces, and content of sulfur dioxide wherein reduces, and water content rises.Enter in the middle part of second absorption tower after one-level deflection plate demister removing droplet, then zinc oxide slurries counter current contacting spray with tower top, there is the sulfur dioxide gas in chemical reaction absorption flue gas further.After the two-stage demister removing droplet of flue gas after purification through top, absorption tower, leave absorption tower, directly discharge through chimney, sulfur dioxide emissioning concentration reaches country or local environmental protection standard.In order to maintain Zn-Mn system in absorption tower, sulfur balance, water balance, ensure that absorption system normally runs, a certain amount of slurries need be drawn continuously in absorption tower, main containing zinc sulfite solid, the zinc sulfate of dissolving, excessive zinc oxide and solid impurity, water etc. in slurries, and determine that the slurries discharged remove previous stage absorption tower or filter plant according to the pH value that each tower controls.
According to a particular embodiment of the invention, the basic structure on each absorption tower of absorption process is consistent with basic role, and principal character is:
A, tower reactor hold liquid, namely deposit after reacting in zinc oxide slurries and flue gas with absorption tower bottom mixed solution, adopt side stir device to stir this mixed solution, to prevent slurries sedimentation, the height that tower reactor holds liquid is relevant to the oxidation requirements of sulfur dioxide removal amount, zinc sulfite;
B, the circulatory system adopt unit style design, each spraying layer comprises circulating pump, pipe-line system, spray assemblies and nozzle, all is furnished with a circulating pump connected with spray piping 270, thus in guarantee absorption tower more than 200% absorption slurries coverage rate, the nozzle of spray thrower 220 adopts specific form at utmost to reduce the generation of blocking;
C, demister 240 adopt baffle plate type, and after removing the droplet carried secretly in air-flow, discharge absorption tower, except last absorption tower arranges except two-layer demister, other absorption tower only needs one deck demister;
The oxidation of d, zinc sulfite: according to the demand supplies oxidation air to byproduct, air lance is located on front side of side stir device, and the air sprayed into is blended into tiny bubble by the slurries that agitator promotes, and is scattered among slurries well;
E, each absorption tower liquid-gas ratio are at 8 ~ 25L/m 3, establish 2 ~ 5 layers of slurries spraying layer according to spray requirement;
In f, tower reactor, pH value controls 2 ~ 6, and solids content controls 5% ~ 20%, and zinc sulfite oxygenation efficiency is 10 ~ 80%.
The essential difference of each absorption tower function of series connection is:
A, tower reactor pH value gradient control, and the slurry pH value according to the sequential control of flue gas process raises gradually;
B, determine to blast oxidation air from a certain tower or certain two tower according to the needs of byproduct, in tower, whether the controlling value of solids content needs to do different settings because being oxidized simultaneously.
Slurries isolated by filtration: the slurries of discharging from absorption tower realize Separation of Solid and Liquid by filter press, Zn in filtrate 2+concentration reach certain requirement (normally electrolyte concentrations require more than 100g/L) and can discharge, do not meet concentration requirement and return slurrying.Solid slag after press filtration transports process.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.

Claims (3)

1. a flue gas processing method, described flue gas contains sulfur dioxide, it is characterized in that, described method comprises:
Zinc oxide particles is carried out process of sizing mixing, to obtain zinc oxide slurries;
Described zinc oxide slurries are utilized to process the flue gas containing sulfur dioxide, to absorb the sulfur dioxide in described flue gas,
Wherein, described zinc oxide slurries adopt spray mode to contact with the described flue gas adverse current containing sulfur dioxide,
Wherein, the concentration of described sulfur dioxide in flue gas is for being greater than 1000mg/Nm 3,
In described zinc oxide slurries, zinc oxide content is 5 ~ 30 % by weight,
The particle mean size of the solid particle in described zinc oxide slurries is 150 ~ 400 orders,
By described zinc oxide slurries with containing the flue gas of sulfur dioxide with 6 ~ 40L/m 3liquid-gas ratio carry out absorption process,
Described zinc oxide slurries contact with the described flue gas adverse current containing sulfur dioxide in the mode of Multi-layer sprinkling,
Under the condition that there is oxygen, make described zinc oxide slurries and described smoke contacts,
Described oxygen provides in the form of air, utilizes side stir device that air is blended into bubble, is dispersed in slurries.
2. method according to claim 1, is characterized in that, comprises further:
Repeatedly desulfurization process is carried out, to prepare multiple byproduct to the described flue gas containing sulfur dioxide.
3. method according to claim 1, is characterized in that, comprises further:
Demist process is carried out to described zinc oxide slurries and the droplet that exists in the environment of the smoke contacts containing sulfur dioxide.
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CN102423622A (en) * 2011-10-21 2012-04-25 中国恩菲工程技术有限公司 Zinc oxide desulfuration technology
CN103349901A (en) * 2013-06-14 2013-10-16 中国恩菲工程技术有限公司 Flue gas processing method and device thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103349901A (en) * 2013-06-14 2013-10-16 中国恩菲工程技术有限公司 Flue gas processing method and device thereof

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