CN110237670A - It is a kind of to use Dual alkali circulation desulfurization system and its sulfur removal technology - Google Patents

It is a kind of to use Dual alkali circulation desulfurization system and its sulfur removal technology Download PDF

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Publication number
CN110237670A
CN110237670A CN201910564726.0A CN201910564726A CN110237670A CN 110237670 A CN110237670 A CN 110237670A CN 201910564726 A CN201910564726 A CN 201910564726A CN 110237670 A CN110237670 A CN 110237670A
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spray
desulfurization
unit
lye
circulation
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CN110237670B (en
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王友仁
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Chengdu Haicheng Environmental Protection Engineering Co Ltd
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Chengdu Haicheng Environmental Protection Engineering Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/501Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502Sulfur 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/501Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/96Regeneration, reactivation or recycling of reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/30Alkali metal compounds
    • B01D2251/304Alkali metal compounds of sodium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • B01D2251/604Hydroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

Dual alkali circulation desulfurization system and its sulfur removal technology are used this application discloses a kind of, is related to environment protection field, and in particular to industrial waste gas desulphurization system and technique.Including interconnected circulated sprinkling desulfurization unit and displacement reaction cycle recovery unit, circulated sprinkling desulfurization unit is the sulfide removed in sulphur-containing exhaust gas and desulfurization product is sent to cyclic permutation reaction, recovery unit carries out displacement reaction and the liquid after displacement is used further to the cellular system of circulation sulphur removal, the sulfur removal technology has abandoned the mode of existing slurrying precipitating, fundamentally avoids the technical issues of solid impurity participates in spray blocking spray head;It is carried out by different level using the acidity of control sodium hydroxide solution, circulated sprinkling can reduce sodium hydroxide consumption while capable of effectively removing pernicious gas, air foam can be effectively removed by the clear water atomizing spray of the first journey of tower top and demister foam removal and carries dust and foam secretly, and the gas after avoiding desulfurization process generates dust pollution to atmosphere.

Description

It is a kind of to use Dual alkali circulation desulfurization system and its sulfur removal technology
Technical field
The present invention relates to environment protection fields, and in particular to the desulfurizing and purifying processing system and its processing work of industrial sulphur-containing exhaust gas Skill.
Background technique
Flue gas desulfurization technique type is up to tens kinds at present, whether adds the dry of water and desulfurization product by the desulfurizing agent of sweetening process Wet form, flue gas desulfurization are divided into: wet process, semidry method, dry method three categories sulfur removal technology.Wet Flue Gas Desulfurization Technique is more mature, efficiency Height, it is easy to operate.After traditional limestone/lime-gypsum method flue gas desulfurization technique uses calcium-based desulfurizing agent sulfur dioxide absorption Calcium sulfite, the calcium sulfate of generation form fouling, blocking since its solubility is smaller, easily in desulfurizing tower and in pipeline now As.Dual alkali scrubbing FGD process technology be in order to overcome lime stone-lime method be easy fouling the shortcomings that and grow up, still Existing double subtraction sulfur removal technologies are all similar, but all there are many insufficient or problems to be solved.
Existing double subtraction desulfurization lye production generally use following process flows: using lime carry out made of slurries with The metabisulfite solution that spray column is returned carries out displacement reaction in a displacement reaction tank, quiescent setting for a period of time after, take supernatant Liquid is as the reaction lye for participating in desulfurization.It there are obvious drawback or deficiency is entire preparation process using aforesaid way Taking up a large area for requirements of process, it is waiting for a long time;Meanwhile lime is unable to fully reacting, still can in the lye after static There are solid impurities, generate very big negative influence hence for subsequent spray.Solid impurity gently can then damage circulated sprinkling pump Sealing element, it is heavy then the spray head of spray can be blocked, cause absorption system can not continuous operation.
In order to overcome the shortcomings of existing desulfurization technology, the present invention provide a kind of novel Dual alkali circulation desulfurization system and Carry out the process of desulfurization using the system, realize that centralization is efficient, continuous circulation desulfurization, system provided by the invention and its Process carries out desulfurization by different level using the lye of control different PH, greatly reduces consumption of the carbon dioxide to soda, The consumption of desulfuration efficiency and lye can be effectively taken into account, desulphurization cost is reduced.The partial desulfurization lye of relatively low acidity is utilized simultaneously It participates in the displacement reaction of lime and that reaction solution is filtered solid is recycled, can effectively solve spray pump sealing part abrasion and spray Head blockage problem, enables desulphurization system continuous and steady operation.
Summary of the invention
Incomplete in order to solve lime reaction of the existing technology, there are solid impurities to be easy blocking spray head, and damage increases The problem of pressing equipment, and lime white and the biggish occupied area of precipitating needs are prepared, integration degree is not high.The application provides Dual alkali circulation desulfurization system and sulfur method using the system, the mode of existing slurrying precipitating has been abandoned, from root The technical issues of solid impurity participates in spray blocking spray head is avoided on this, meanwhile, it is layered using sodium hydroxide aqueous slkali It is secondary, the mode of circulated sprinkling, while can effectively remove pernicious gas, moreover it is possible to by the clear water atomizing spray for being located at tower top Dust and the foam removal for carrying gas with demister, the gas after avoiding desulfurization process generate dust pollution to atmosphere.
In order to achieve the above object, technical solution used by the application are as follows:
It is a kind of to use Dual alkali circulation desulfurization system, it is followed including interconnected circulated sprinkling desulfurization unit and displacement reaction Ring recovery unit, the circulated sprinkling desulfurization unit are set for removing the sulfide in sulphur-containing exhaust gas and being sent to desulfurization product Change the unary system that reaction cycle recovery unit carries out displacement reaction and the substitution product after displacement reaction is used further to circulation sulphur removal System, specifically include: as the eddy flow absorption tower of desulfurization main body, the eddy flow absorb the bottom of the tower is communicated with for leading to sulphur-containing exhaust gas The desulfurization lye is sent into eddy flow absorption tower by the exhaust gas air-introduced machine entered, and the lye circulatory pool for storing desulfurization lye The middle lye circulated sprinkling pump for participating in desulphurization reaction, the outlet of the lye circulated sprinkling pump pass through the first pH value automatic controller It is connected with PH automatic alkali adding device, the PH automatic alkali adding device is also connected with the Alkali liquid compounding slot for supplying lye;Into When row desulfurization works, lye configured slot is spare according to the lye for the soda amount configuration sufficient amount that system requires supplementation with, general to set The pH value of second spray unit is greater than 13, by the detection of PH automatic alkali adding device, feedbacks and controls the spray towards eddy flow absorption tower The acidity for drenching liquid, the solution after reaction are still in alkalinity, set the pH value of third spray unit as 7-9 or so, after reacting at this time Alkaline solution not instead of pure cerium hydroxide sodium, include the mixed solution of sodium hydroxide solution, sodium sulfite and metabisulfite solution, It is finally collected by lye circulatory pool and is used for subsequent use.
The displacement reaction cycle recovery unit is that the desulfurization product for generating circulated sprinkling desulfurization unit is replaced into The cellular system of lye and calcium sulfate, specifically includes: as the metathesis reactor of displacement reactive agent, with the metathesis reactor Type washing trough, high pressure blower, lime storage tank and the lye circulatory pool of feed end connection;With the metathesis reactor The overflow liquid filter and calcium sulfate slag filter of discharge end connection, the overflow liquid filter are also respectively connected with the lye and follow Cisterna ambiens and calcium sulfate filter.On the one hand the reaction raw materials of metathesis reactor come from the sodium salt after the reaction of eddy flow absorption tower On the other hand solution comes from the calcium hydroxide in lime storage tank, after displacement reaction, obtain calcium sulfate and sodium hydroxide is molten Liquid;Calcium sulfate obtains the gypsum that calcium sulfate slag is used as construction material after the filtering of calcium sulfate slag filter, carries out recycling benefit With;Sodium hydroxide solution is filtered to remove after solid matter by overflow liquid filter to be repeated to enter in lye circulatory pool as de- Sulfur feedstock is reused.So that technical solution can remove the slurrying of large area from using the above structure, needed for precipitating Pond, the occupied area of desulphurization system can be reduced.Meanwhile avoid using lime white and calcium slag precipitating by the way of can not keep away The solid impurity exempted from participates in desulfurization, leads to the problem of blocking spray head and equipment.The purpose for adding high pressure blower is reacted in displacement In the process, since there are sodium bisulfates or sodium hydrogensulfite to participate in reaction for the mixed solution in lye circulatory pool, then reacting Product will be calcium bisulfate or calcium bisulfite, further, calcium bisulfate or calcium bisulfite are simultaneously and hydrogen Calcium oxide reaction can obtain calcium sulfite, and cannot obtain pure calcium sulfate;When high pressure blower will have the sky of a large amount of oxygen Gas is passed through in metathesis reactor, and calcium sulfite can generate calcium sulfate product under the oxidation of oxygen, then we can receive Collect pure calcium sulfate slag, reaches the resource utilization purpose that turns waste into wealth.
Further, the eddy flow absorption tower includes tower body, and the tower body side wall is set close to bottom along tower body tangential direction It is equipped with air inlet, there is exhaust tube at the top of tower body, be from top to bottom disposed with the first spray desulfurization unit, second inside tower body It sprays desulfurization unit and third sprays desulfurization unit;The first spray desulfurization unit, the second spray desulfurization unit and third spray Leaching desulfurization unit is respectively arranged with the first collection port, the second collection port and the third collection port for being connected to the lye circulatory pool, with And connection lye circulated sprinkling pump the first inlet, the second inlet, third inlet and the first spray desulfurization unit, At least one layer of spiral board is provided in second spray desulfurization unit and third spray desulfurization unit.
Structure and working principle summary: the setting of spiral board is to improve desulfuration efficiency, needle to increase gas circulating resistance Personalized designs are carried out to the actual conditions of different flue gas operating conditions, ensure that spiral-plate leaf size, rotation angle, the elevation angle, Desulfuration efficiency and resistance have stringent control.The design of spiral board is very crucial, and there are many experiences in the inside.The plane of old stuff It is all eliminated fastly on spiral board either efficiency and anti-blocking and resistance.Spiral board resistance with setting angle is much smaller, It is more demanding in the design since there are two space angles for blade.When being used for desulfurization, slurries on blade can be from the center of circle to tower Wall flowing increases the time of gas and liquid contact, so high-efficient.If the dust concentration in exhaust gas to be processed is big, then The necessary spacing control of spacing between spiral board avoids generating blocking in 150MM or more.The purpose designed using the above structure is It realizes and is sprayed independently of each other between the first spray desulfurization unit, the second spray desulfurization unit and third spray desulfurization unit, sprayed Solution afterwards is collected separately, and it is most to reach object for the reaction and processing of different zones according to the difference of solution composition and pH value It is used, and raw material, the purpose of improvement effect are saved.
As preferred embodiment of the invention, particularly, the first spray desulfurization unit, the second spray desulfurization unit and the Three spray desulfurization units include spray unit for spray, and the spray unit includes for being integrally formed and being interconnected One ring pipe, the second ring pipe, straight tube, and be detachably fixed and be mounted on the first annular pipe, the second ring pipe, on straight tube Multiple spray heads.Spray unit multi-section point in existing desulfurizing tower carries out fan spray using larger spray head, although in appearance It is larger that liquid sprays covering surface, but actual liquid particles are less, and fogging degree is low, is unfavorable for reaction or not in unit Reach better reaction effect in time.Multi-turn layer is used in the present invention, the design of more spray heads can be realized atomization all standing, Increase the technical effect of desulphurization reaction.Meanwhile the design for disassembly of spray head can be realized an other separate repair replacement, plurality The design of the spray head of amount will not generate essential or substantive influence after part blocks to desulfurization process.
The first spray desulfurization unit, the second spray desulfurization unit bottom are provided with collector unit, the collector unit Including the closed collecting tank being fixedly connected with tower body inner wall, the through-hole for gas circulation is provided on the closed collecting tank, Fixed be tightly connected in the through-hole edge has air guide column, and air guide column upper end is fixedly connected with the liquid for preventing spray unit from spraying Body enters the screening liquid cover in the air guide column, described to hide the sky being provided between liquid cover and the air guide column for gas evolution Gap.The main purpose that collector unit plays is that the independent of solution after realizing reaction is collected, and utilizes convenient for following cycle, improves desulfurization Effect and reduction lye investment indirectly improve practical sulphur removal reaction effect secondly can also extend the circulation residence time of gas Fruit.
In order to sufficiently realize recycling for lye, the present invention is particularly realized using following structures: the lye circulation Pond includes independent first circulation pond, second circulation pond and third circulatory pool, and the lye circulated sprinkling pump includes that three-level recycles Spray pump, secondary cycle spray pump and primary cycle spray pump;The input end of the three-level circulated sprinkling pump and first circulation pond Connection, outlet end are connected to metathesis reactor and third spray desulfurization unit respectively;The input end of the secondary cycle spray pump It is connected to second circulation pond, outlet end is connected to the second inlet;The input end and third circulatory pool of the primary cycle spray pump Connection, outlet end are respectively communicated with first into the night mouthful of metathesis reactor and the first spray desulfurization unit;In the first circulation pond The second liquid level self-controller for controlling the three-level circulated sprinkling pump is installed;
First collection port is connected to the third circulatory pool, and the second collection port is respectively communicated with first circulation pond and second and follows Cisterna ambiens, the second pH value automatic controller between the first circulation pond and the second collection port by being arranged in first circulation pond Control opening and closing, third collection port are connected to first circulation pond.
In order to promote the technical effect and effect of circulation desulfurization system of the present invention, particularly also provide a kind of using double The technique of alkaline process circulation desulfurization specifically includes following processing step:
S001 supplies gas step: sulphur-containing exhaust gas being sent into eddy flow absorption tower by exhaust gas air-introduced machine and participates in desulphurization reaction;
S002 desulfurized step: sulphur-containing exhaust gas enters from eddy flow absorb the bottom of the tower, passes sequentially through third spray desulfurization unit, the Two spray desulfurization units and the first spray desulfurization unit are pumped with from lye circulated sprinkling by the hydroxide in lye circulatory pool It is discharged into after being positioned close to the demister purification foam removal of exhaust tube position after soda lye progress atomizing spray progress desulphurization reaction Atmosphere;Desulfurization product flows into the storage of lye circulatory pool;The chemical equation generated in the second spray desulfurization unit is such as Under:
2NaOH+SO2→Na2SO3+H2O ①
2NaOH+SO2+1/2O2→Na2SO4+H2O ②
The chemical equation generated in the third spray desulfurization unit is as follows:
Na2SO4+SO2+H2O→NaHSO4+NaHSO3
Na2SO3+SO2+H2O→2NaHSO3
NaOH+SO2→NaHSO3
S003 displacement step: the desulfurization product in step S002 in lye circulatory pool is sent into metathesis reactor and is come from Displacement reaction occurs in water and the oxygen in the large quantity of air that high pressure blower is passed through for lime in lime storage tank and oxidation is anti- Alkaline solution of sodium hydroxide and calcium sulfate should be generated;
The chemical equation generated in displacement reaction is as follows:
2NaHSO3+Ca(OH)2→Ca(HSO3)2+2NaOH⑥
2NaHSO4+Ca(OH)2→Ca(HSO4)2+2NaOH⑦
Ca(OH)2+Ca(HSO3)2→2Ca SO3+H2O ⑧
Ca(OH)2+Ca(HSO4)→2Ca SO4+H2O ⑨
The purpose for adding high pressure blower is in displacement reaction process, since the mixed solution in lye circulatory pool has sulfuric acid Perhaps sodium hydrogensulfite participates in the product that so reacts of reaction to hydrogen sodium will be calcium bisulfate or calcium bisulfite, into one Step ground, calcium bisulfate or calcium bisulfite can obtain calcium sulfite with calcium hydroxide reaction simultaneously, and cannot obtain pure Calcium sulfate;When high pressure blower will be passed through in metathesis reactor with the air of a large amount of oxygen, the calcium sulfite under the oxidation of oxygen Slaking reaction can be generated and generate calcium sulfate product, then we can be collected into pure calcium sulfate slag, reach turn waste into wealth, Resource utilization purpose.The chemical equation of slaking reaction is as follows:
2Ca SO3+O2→2Ca SO4
S004 circulation desulfurization: the alkaline solution of sodium hydroxide supernatant generated in metathesis reactor in step S003 is passed through Sodium hydroxide solution is passed back into lye circulatory pool after the filtering of overflow liquid filter and participates in and repeats step S002 desulfurized step Reaction step is replaced with S003;
S005 recycling step: by the semi-solid/solid residue in step S003 in metathesis reactor and overflow liquid filter Be sent into calcium sulfate slag filter in after filtering, liquids recovery enter lye circulatory pool repeat participate in step S002 desulfurized step and S003 replaces reaction step;Solid calcium sulphate slag is obtained simultaneously.
In order to which with further clarifying and optimizing inventive desulfurization technique, the specific desulfurization of S002 desulfurized step, which sprays, includes Following steps:
S0021 by three-level circulated sprinkling pump by be located at first circulation pond in pH value be 7-9 alkaline solution respectively by it Middle a part, which is transported to, carries out spray atomizing in third spray desulfurization unit, absorbs with eddy flow is introduced by exhaust gas air-introduced machine Sulphur-containing exhaust gas reaction in tower, sloughs the sulfur dioxide gas in sulphur-containing exhaust gas, solution is collected by first circulation pond after reaction;Separately A part is sent into metathesis reactor, is used for displacement reaction;
Sodium hydroxide solution of the S0022 by secondary cycle spray pump by pH value in second circulation pond greater than 13 is transported to positioned at the It is further anti-that sulfur dioxide gas progress remaining after reacting in spray atomizing and step S0021 is carried out in two spray desulfurization units It answers, the solution after reaction is divided into two-way and passes through first circulation pond and the collection of second circulation pond respectively, follows for the second time for step S0021 Ring uses;Wherein, the automatic control of the first pH value is additionally provided between the secondary cycle spray pump and the second spray desulfurization unit Device will be in Alkali liquid compounding slot by opening PH automatic alkali adding device when secondary cycle spray pump conveying lye pH value is lower than 13 The sodium hydroxide solution of configuration is sent into the second spray desulfurization unit;Conversely, the first pH value automatic controller closes the PH certainly Dynamic adder-subtractor;
S0023 by primary cycle spray pump by the clear water in third circulatory pool be respectively delivered to the first spray desulfurization unit and In metathesis reactor;Wherein, the first liquid level self-controller is provided between metathesis reactor and primary cycle spray pump, when setting When the liquid level changed in reactor reaches preset value, first liquid level self-controller is closed;Into the first spray desulfurization unit Clear water by step S0022 reaction after gas chalk dust removing is gone by atomizing spray, gas is carried finally by demister Foam removal after discharge and complete desulfurized step.
Further, the specific replacement process of S003 displacement step is as follows:
Step S0031 will pass through three-level circulated sprinkling pump and be sent into the desulfurization product in first circulation pond in step S0021 In metathesis reactor in lime storage tank lime with from primary cycle spray pump by the clear water in third circulatory pool Mixing occurs displacement reaction and generates sodium hydroxide, calcium sulfite and calcium sulfate;
Large quantity of air is passed through in metathesis reactor by step S0032 high pressure blower, oxidation reaction occurs, by step S0031 In calcium sulfite oxidation at calcium sulfate, obtain alkaline solution of sodium hydroxide and calcium sulfate.
Wherein, overflow liquid filter uses vacuum filter in step S004.
Wherein, step S005 further includes that the semi-solid/solid residue in metathesis reactor is sent into calcium sulfate slag filter Pass through the step of clear water in type washing trough carries out high pressure washing afterwards, the water in the type washing trough comes from municipal water, municipal water Lead at two respectively, for rinsing calcium sulfate slag filter at one, is followed at one by third liquid level self-controller connection first Cisterna ambiens controls whether municipal water carries out moisturizing effects according to whether the height of water level in primary cycle pond reaches preset water level.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of application for those skilled in the art without any creative labor, can be with root Other attached drawings are obtained according to these attached drawings.
Fig. 1 is system structure diagram of the invention;
Fig. 2 is present system connection block diagram;
Fig. 3 is the schematic cross-sectional view (without spiral board) on eddy flow absorption tower;
Fig. 4 is spray unit three-dimensional structure diagram;
Fig. 5 is the three-dimensional structure diagram of the matrix embodiment of spray unit;
In figure: 0- tap water;1- sulphur-containing exhaust gas;2- exhaust gas air-introduced machine;
3- eddy flow absorption tower;31- tower body;311- exhaust outlet;
32- spray unit;The first annular pipe of 321-;322- spray head;323- straight tube;The second ring pipe of 324-;
33- collector unit;331- hides liquid cover;332- support rod;333- air guide column;The closed collecting tank of 334-;
The first collection port of 34-;The second collection port of 35-;36- air inlet;37- third collection port;38- third inlet;39- Second inlet;The first inlet of 40-.
4- lye circulatory pool;41- first circulation pond;42- second circulation pond;43- third circulatory pool;
5- lye circulated sprinkling pump;51- three-level circulated sprinkling pump;52- secondary cycle spray pump;53- primary cycle spray Pump;
6-PH automatic alkali adding device;7- Alkali liquid compounding slot;8- exhaust tube;9- overflow liquid filter;10- water ring vacuum pump; 11- metathesis reactor;12- type washing trough;13- high pressure blower;14- lime storage tank;15- calcium sulfate slag filter;16- calcium sulfate Slag;17- the first pH value automatic controller;18- the second pH value automatic controller;The first liquid level self-controller of 19-;20- second Liquid level self-controller;21- third liquid level self-controller.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is Some embodiments of the present application, instead of all the embodiments.The application being usually described and illustrated herein in the accompanying drawings is implemented The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiments herein provided in the accompanying drawings is not intended to limit below claimed Scope of the present application, but be merely representative of the selected embodiment of the application.Based on the embodiment in the application, this field is common Technical staff's every other embodiment obtained without making creative work belongs to the model of the application protection It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present application, it should be noted that if occur term " center ", "upper", "lower", "left", "right", The orientation or positional relationship of the instructions such as "vertical", "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, Either this application product using when the orientation or positional relationship usually put, be merely for convenience of description the application and simplification retouched It states, rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, Therefore it should not be understood as the limitation to the application.If only being used in addition, occurring term " first ", " second " etc. in the description of the present application It is described in distinguishing, is not understood to indicate or imply relative importance.
If being not offered as requiring component absolute in addition, occurring the terms such as term "horizontal", "vertical" in the description of the present application Horizontal or pendency, but can be slightly tilted.If "horizontal" only refers to that its direction is more horizontal with respect to for "vertical", not It is to indicate that the structure is had to fully horizontally, but can be slightly tilted.
In the description of the present application, it is also necessary to which explanation is unless specifically defined or limited otherwise, if there is term " setting ", " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to detachably connect It connects, or is integrally connected;It can be mechanical connection, be also possible to be electrically connected;It can be directly connected, intermediate matchmaker can also be passed through Jie is indirectly connected, and can be the connection inside two elements.It for the ordinary skill in the art, can be with concrete condition Understand the concrete meaning of above-mentioned term in this application.
Embodiment 1:
It is a kind of to use Dual alkali circulation desulfurization system in conjunction with shown in Figure of description 1-4, it is sprayed including interconnected circulation Desulfurization unit and displacement reaction cycle recovery unit are drenched, the circulated sprinkling desulfurization unit is for removing in sulphur-containing exhaust gas 1 Sulfide and by desulfurization product be sent to displacement reaction cycle recovery unit carry out displacement reaction and by the substitution product after displacement again For recycling the cellular system of sulphur removal, specifically include: as the eddy flow absorption tower 3 of desulfurization main body, 3 bottom of eddy flow absorption tower It is communicated with the exhaust gas air-introduced machine 2 for sulphur-containing exhaust gas 1 to be passed through, and the lye circulatory pool 4 for storing desulfurization lye, by institute It states desulfurization lye and is sent into eddy flow absorption tower 3 the lye circulated sprinkling pump 5 for participating in desulphurization reaction, the lye circulated sprinkling pump 5 Outlet be connected with PH automatic alkali adding device 6, the PH automatic alkali adding device 6 is also connected with the Alkali liquid compounding for supplying lye Slot 7;When carrying out desulfurization work, lye configured slot 7 is spare according to the lye for the dosage configuration sufficient amount that system soda consumes, and one As setting pH value be greater than 13, by the detection of PH automatic alkali adding device, feedback and control the alkali of addition towards eddy flow absorption tower 3 Amount, the solution after reaction is in still alkalinity, but pH value can be reduced to 7-9 or so, and the alkaline solution after reacting at this time is not pure Sodium hydroxide, but include the mixed solution of sodium hydroxide solution, sodium sulfite and metabisulfite solution, finally by lye circulatory pool 4 collect for subsequent use.The displacement reaction cycle recovery unit is the desulfurization for generating circulated sprinkling desulfurization unit Product is replaced into the cellular system of lye and calcium sulfate, specifically includes: as the metathesis reactor 11 of displacement reactive agent, with institute State type washing trough 12, high pressure blower 13, lime storage tank 14 and the lye circulation of the connection of 11 feed end of metathesis reactor Pond 4;The overflow liquid filter 9 and calcium sulfate slag filter 15 being connect with 11 discharge end of metathesis reactor, the overflowing liquid Filter 9 is also respectively connected with the lye circulatory pool 4 and calcium sulfate filter 15.The reaction raw materials of metathesis reactor 11 are on the one hand The sodium salt solution after eddy flow absorption tower 3 is reacted is come from, the calcium hydroxide in lime storage tank 14 is on the other hand come from, After displacement reaction, calcium sulfate and sodium hydroxide solution are obtained;Calcium sulfate obtains sulphur after the filtering of calcium sulfate slag filter 15 Sour calcium slag 16 is used as the gypsum of construction material, carries out resource utilization;After sodium hydroxide solution is filtered by overflow liquid filter 9 Repetition is entered in lye circulatory pool 4 and is reused as desulfurization material.So that technical solution using the above structure Pond needed for the slurrying, displacement reaction, precipitating of large area can be removed from, can greatly reduce the land occupation face of desulphurization system Product.Meanwhile avoiding and desulfurization is participated in using the inevitable solid impurity of lime white, lead to block asking for spray head and equipment damage Topic.The purpose for adding high pressure blower 13 is in displacement reaction process, since there are sulphur for the mixed solution in lye circulatory pool 4 Perhaps sodium hydrogensulfite participates in the product that so reacts of reaction to sour hydrogen sodium will be calcium bisulfate or calcium bisulfite, into One step, calcium bisulfate or calcium bisulfite can obtain calcium sulfite with calcium hydroxide reaction simultaneously, and cannot obtain pure Calcium sulfate, then cannot achieve the effect that resource utilization well;When high pressure blower 13 will have the sky of a large amount of oxygen Gas is passed through in metathesis reactor 11, and calcium sulfite can generate calcium sulfate product under the oxidation of oxygen, then we It is collected into pure calcium sulfate slag, achievees the purpose that turn waste into wealth, resource utilization.
Embodiment 2:
Further, described further combined with shown in Figure of description 1-5 in the structure and basis of embodiment 1 Eddy flow absorption tower includes tower body 31, and 31 side wall of tower body is provided with air inlet 36, tower along 31 tangential direction of tower body close to bottom There is exhaust tube 8 at the top of body 31, the first spray desulfurization unit, the second spray desulfurization are from top to bottom disposed with inside tower body 31 Unit and third spray desulfurization unit;The first spray desulfurization unit, the second spray desulfurization unit and third spray desulfurization list Member is respectively arranged with the first collection port 34, the second collection port 35 and the third collection port 37 for being connected to the lye circulatory pool, and It is connected to the first inlet 40, the second inlet 39, third inlet 38 and the first spray desulfurization of the lye circulated sprinkling pump At least one layer of spiral board is provided in unit, the second spray desulfurization unit and third spray desulfurization unit.
Structure and working principle summary: the setting of spiral board is to improve desulfuration efficiency to increase air-liquid time of contact, Personalized designs are carried out for the actual conditions of different flue gas operating conditions, ensure that spiral-plate leaf size, rotation angle, face upward Angle, desulfuration efficiency and resistance have stringent control.The resistance design of spiral board is very crucial, and there are many experiences in the inside.Old stuff Plane rotational flow plate either efficiency and anti-blocking and resistance on be all eliminated fastly.Spiral board resistance with setting angle is small Much, more demanding in the design since there are two space angles for blade.When being used for desulfurization, the slurries on blade can be from circle The heart is flowed to tower wall, the air-liquid time of contact on blade is increased, so high-efficient.If the dust concentration in exhaust gas to be processed Greatly, it then the control of two spiral-plate leaf spacing must be kept in 150MM or more, avoids generating blocking.It designs using the above structure Purpose be realize first spray desulfurization unit, second spray desulfurization unit and third spray desulfurization unit between spray independently of each other Leaching, the solution after spray are collected separately, according to the difference of solution composition and pH value, for the reaction and processing of different zones, Reach and make the best use of everything, saves raw material, the purpose of improvement effect.Simultaneously, it is often more important that, desulfurization unit, second are sprayed by first Spray can make the high-temperature gas come in from tower body the independently of each other between spray desulfurization unit and third spray desulfurization unit After once coming in from tower body, spray is contacted with third spray desulfurization unit first, is this time sprayed there are two the effects reached: the One, most sulfur dioxide gas can be reacted away;Second, the temperature of gas can be reduced, after reducing gas temperature, Gas, which enters in the second spray desulfurization unit, substantially belongs to room temperature or the temperature close to room temperature, in such a case, gas Middle mixed carbon dioxide would not participate in reacting with lye or degree of participation is well below hot environment;Therefore, in this way may be used To reduce a large amount of lye investment, lye is sufficiently used for the removal of sulfur dioxide, reaches and saves a large amount of lye, reduce cost Purpose.
In the present embodiment, the first spray desulfurization unit, the second spray desulfurization unit and third spray desulfurization unit are equal Comprising the spray unit 32 for spray, the spray unit 32 include be integrally formed and interconnected first annular pipe 321, Second ring pipe 324, straight tube 323, and be detachably fixed and be mounted on the first annular pipe 321, the second ring pipe 324, straight Multiple spray heads 322 on pipe 323.Spray unit multi-section point in existing desulfurizing tower carries out fan spray using larger spray head, Although in appearance liquid sprinkling covering surface it is larger, actual liquid particles are less, and fogging degree is low, be unfavorable for reaction or Do not reach better reaction effect within the unit time.Multi-turn layer, the design of more spray heads 322, Neng Goushi are used in the present invention It is now atomized all standing, increases the technical effect of desulphurization reaction.Meanwhile the design for disassembly of spray head 322 can be realized it is other solely Vertical maintenance replacement, the design of greater number of spray head 322 will not generate desulfurization process after part blocks essential Or substantive influence.Meanwhile according to various sizes of design, the number of the first annular pipe 321 and the second ring pipe 324 Amount can be set multiple;Annular setting can also be changed to rectangular array setting, structure as shown in Figure 5, in order to will It sprays range and covers entire conversion zone.
The first spray desulfurization unit, the second spray desulfurization unit bottom are provided with collector unit 33, and the collection is single Member 33 includes the closed collecting tank 334 being fixedly connected with 31 inner wall of tower body, is provided on the closed collecting tank 334 for gas The through-hole of circulation, fixed be tightly connected in the through-hole edge have air guide column 333, and 333 upper end of air guide column is fixedly connected with anti- The liquid that only spray unit 32 sprays enters the screening liquid cover 331 in the air guide column 333, the screening liquid cover 331 and the air guide The gap for gas evolution is provided between column 333.The main purpose that collector unit 33 plays is to realize solution after reaction It is independent to collect, it is recycled convenient for subsequent PH hierarchical control, improves desulfurization effect and reduce lye investment, secondly can also slow down The velocity of liquid assets of gas increases the reaction time, indirectly improves practical sulphur removal reaction effect.The setting of the air guide column 333 It is easy for gas evolution, diameter can be arranged according to the size of gas flow, and diameter is bigger, and gap is bigger, what the unit time passed through Gas flow is bigger.
In order to sufficiently realize recycling for lye, the present invention is particularly realized using following structures: the lye circulation Pond includes independent first circulation pond (41), second circulation pond (42) and third circulatory pool (43), the lye circulated sprinkling pump Including three-level circulated sprinkling pump 51, secondary cycle spray pump (52) and primary cycle spray pump 53;The three-level circulated sprinkling pump 51 input end is connected to first circulation pond 41, and outlet end is connected to metathesis reactor 11 and third spray desulfurization unit respectively; The input end of the secondary cycle spray pump 52 is connected to second circulation pond 42, and outlet end is connected to the second inlet 39;Described one The input end of grade circulated sprinkling pump 53 is connected to third circulatory pool 43, and outlet end is respectively communicated with metathesis reactor 11 and the first spray The first of desulfurization unit is into night mouthfuls 40;It is equipped in the first circulation pond 41 for controlling the three-level circulated sprinkling pump 51 Second liquid level self-controller 20;
First collection port 34 is connected to the third circulatory pool 43, and the second collection port 35 is respectively communicated with first circulation pond 41 With second circulation pond 42, between the first circulation pond 41 and the second collection port 35 by be arranged in first circulation pond 41 the The control opening and closing of two pH value automatic controllers 18, third collection port 37 are connected to first circulation pond 41.
Embodiment 3:
In conjunction with shown in Figure of description 1-5, a kind of technique using Dual alkali circulation desulfurization is specifically walked comprising following technique It is rapid:
S001 supplies gas step: sulphur-containing exhaust gas 1 being sent into eddy flow absorption tower 3 by exhaust gas air-introduced machine 2 and participates in desulphurization reaction;
S002 desulfurized step: sulphur-containing exhaust gas 1 from 3 bottom of eddy flow absorption tower enter, pass sequentially through third spray desulfurization unit, Second spray desulfurization unit and first sprays desulfurization unit and pumps 5 for the hydrogen in lye circulatory pool 4 from lye circulated sprinkling It is discharged into after being positioned close to the demister purification foam removal of 8 position of exhaust tube after oxidation soda lye atomizing spray progress desulphurization reaction Atmosphere;Desulfurization product flows into lye circulatory pool 4 for being recycled;The chemical reaction generated in the second spray desulfurization unit Equation is as follows:
2NaOH+SO2→Na2SO3+H2O ①
2NaOH+SO2+1/2O2→Na2SO4+H2O ②
The chemical equation generated in the third spray desulfurization unit is as follows:
Na2SO4+SO2+H2O→NaHSO4+NaHSO3
Na2SO3+SO2+H2O→2NaHSO3
NaOH+SO2→NaHSO3
S003 replaces reaction step: the desulfurization product in step S002 in lye circulatory pool 4 is sent into metathesis reactor 11 In with the lime in lime storage tank 14 water and oxygen in the large quantity of air that high pressure blower 13 is passed through occur displacement, Oxidation reaction generates alkaline solution of sodium hydroxide and calcium sulfate;
The chemical equation generated in displacement reaction is as follows:
2NaHSO3+Ca(OH)2→Ca(HSO3)2+2NaOH ⑥
2NaHSO4+Ca(OH)2→Ca(HSO4)2+2NaOH ⑦
Ca(OH)2+Ca(HSO3)→2Ca SO3+H2O ⑧
Ca(OH)2+Ca(HSO4)→2Ca SO4+H2O ⑨
The purpose for adding high pressure blower is in displacement reaction process, since there are sulphur for the mixed solution in lye circulatory pool Sour hydrogen sodium and sodium hydrogensulfite participate in reaction, then the product reacted will be calcium bisulfate or calcium bisulfite, into one Step ground, calcium bisulfate or calcium bisulfite can obtain calcium sulfite with calcium hydroxide reaction simultaneously, and cannot obtain pure Calcium sulfate, when high pressure blower will be passed through in metathesis reactor with the air of a large amount of oxygen, the calcium sulfite under the oxidation of oxygen Slaking reaction can be generated and generate calcium sulfate product, then we can be collected into pure calcium sulfate slag, reach turn waste into wealth, The purpose of resource utilization.The chemical equation of slaking reaction is as follows:
2Ca SO3+O2→2Ca SO4
S004 circulation desulfurization: the alkaline solution of sodium hydroxide supernatant generated in metathesis reactor 11 in step S003 is led to It crosses that sodium hydroxide solution is passed through in lye circulatory pool 4 after overflow liquid filter 9 filters and participates in and repeat step S002 desulfurization step Rapid and S003 replaces reaction step;
S005 recycling step: the semi-solid/solid in step S003 in metathesis reactor 11 and overflow liquid filter 9 is residual Slag is sent into calcium sulfate slag filter 15 after filtering, and liquids recovery enters lye circulatory pool 4 and repeats to participate in step S002 desulfurization Step and S003 replace reaction step;Solid calcium sulphate slag is obtained simultaneously.
In order to which with further clarifying and optimizing inventive desulfurization technique, the specific desulfurization of S002 desulfurized step, which sprays, includes Following steps:
S0021 is distinguished by three-level circulated sprinkling pump 51 by the alkaline solution that the pH value in first circulation pond 41 is 7-9 is located at A portion is transported to and carries out spray atomizing in third spray desulfurization unit, is revolved with being introduced by exhaust gas air-introduced machine 2 The sulphur-containing exhaust gas 1 flowed in absorption tower 3 reacts, and sloughs the sulfur dioxide gas in sulphur-containing exhaust gas 1, solution is by first circulation after reaction It collects in pond 41;Another part is sent into metathesis reactor 11, is used for displacement reaction;
Sodium hydroxide solution conveying of the S0022 by secondary cycle spray pump 52 by pH value in second circulation pond 42 greater than 13 is in place Remaining sulfur dioxide gas carries out thorough after react in spray atomizing and step S0021 in the second spray desulfurization unit Reaction, the solution after reaction, which is divided into two-way and separately flows into first circulation pond 41 and second circulation pond 42, to be collected, for step S0021 the Secondary cycle uses;Wherein, the first pH value is additionally provided between the secondary cycle spray pump 52 and the second spray desulfurization unit Automatic controller 17 will by opening PH automatic alkali adding device 6 when secondary cycle spray pump 52, which conveys lye pH value, is lower than 13 Sodium hydroxide solution of the pH value configured in Alkali liquid compounding slot 7 greater than 13 is sent into the second spray desulfurization unit;Conversely, the first PH Value automatic controller 17 closes the PH automatic alkali adding device 6;
Clear water in third circulatory pool 43 is respectively delivered to the first spray desulfurization list by primary cycle spray pump 53 by S0023 In member and metathesis reactor 11;Wherein, it is automatic that the first liquid level is provided between metathesis reactor 11 and primary cycle spray pump 53 Controller 19, when liquid level reaches preset value in displacement reaction 11, first liquid level self-controller 19 is closed;Into first Gas after step S0022 reaction is removed chalk dust removing by atomizing spray by the clear water for spraying desulfurization unit, finally by foam removal Device discharges after removing the foam that gas carries and completes desulfurized step.
Further, the S003 displacement specific replacement process of reaction step is as follows:
Step S0031 will pump 51 for the desulfurization product in first circulation pond 41 by three-level circulated sprinkling in step S0021 It is sent into metathesis reactor 11 and recycles third with from primary cycle spray pump 53 with the lime in lime storage tank 14 Clear water mixing in pond 43 occurs displacement reaction and generates sodium hydroxide, calcium sulfite and calcium sulfate;
Large quantity of air is passed through in metathesis reactor 11 by step S0032 high pressure blower 13, oxidation reaction occurs, by step Calcium sulfite oxidation in S0031 obtains alkaline solution of sodium hydroxide and calcium sulfate at calcium sulfate.
Wherein, overflow liquid filter 9 is filtered using vacuum filter in step S004, the vacuum filter it is true Reciprocal of duty cycle is provided by water ring vacuum pump 10.
Wherein, step S005 further includes that the semi-solid/solid residue in metathesis reactor 11 is sent into the filtering of calcium sulfate slag The step of high pressure washing is carried out by the clear water in type washing trough 12 after device 15.Water in the type washing trough 12 is from municipal administration Water, municipal water lead at two respectively, for rinsing calcium sulfate slag filter 15 at one, pass through third liquid level self-controller at one 21 connection third circulatory pools 43, according to the height of water level of third circulatory pool 43 whether reach preset water level control municipal water whether into Row moisturizing effects.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.

Claims (9)

1. a kind of use Dual alkali circulation desulfurization system, including interconnected circulated sprinkling desulfurization unit and displacement reaction cycle Recovery unit, it is characterised in that:
The circulated sprinkling desulfurization unit is anti-for removing the sulfide in sulphur-containing exhaust gas (1) and desulfurization product being sent to displacement It answers circulation and stress unit to carry out displacement reaction and the liquid after displacement is used further to the cellular system of circulation sulphur removal, specifically include: As the eddy flow absorption tower (3) of desulfurization main body, eddy flow absorption tower (3) bottom is communicated with for sulphur-containing exhaust gas (1) to be passed through Exhaust gas air-introduced machine (2), the desulfurization lye is sent into eddy flow and inhaled by and the lye circulatory pool (4) for storing desulfurization lye The lye circulated sprinkling pump (5) that desulphurization reaction is participated in tower (3) is received, the outlet of the lye circulated sprinkling pump (5) passes through first PH value automatic controller (17) is connected with PH automatic alkali adding device (6), and the PH automatic alkali adding device (6) is also connected with for supplying Answer the Alkali liquid compounding slot (7) of lye;
The displacement reaction cycle recovery unit is that the desulfurization product for generating circulated sprinkling desulfurization unit is replaced into lye It with the cellular system of calcium sulfate, specifically includes: as the metathesis reactor (11) of displacement reactive agent, with the metathesis reactor (11) municipal clear water, high pressure blower (13), lime storage tank (14) and the lye circulatory pool (4) of feed end connection;With it is described The overflow liquid filter (9) and calcium sulfate slag filter (15) of metathesis reactor (11) discharge end connection, the overflowing liquid filtering Device (9) is also respectively connected with the lye circulatory pool (4) and calcium sulfate filter (15).
2. according to claim 1 a kind of using Dual alkali circulation desulfurization system, it is characterised in that: the eddy flow absorption tower Including tower body (31), tower body (31) side wall is provided with air inlet (36), tower body along tower body (31) tangential direction close to bottom (31) top has exhaust tube (8), and the first spray desulfurization unit, the second spray are from top to bottom disposed with inside tower body (31) Desulfurization unit and third spray desulfurization unit;The first spray desulfurization unit, the second spray desulfurization unit and third spray are de- Sulphur unit is respectively arranged with the first collection port (34), the second collection port (35) and third collection port for being connected to the lye circulatory pool And the first inlet (40), the second inlet (39), third inlet (38) of connection lye circulated sprinkling pump (37), And first spray desulfurization unit, second spray desulfurization unit and third spray desulfurization unit in be provided at least one layer of eddy flow Plate.
3. according to claim 2 a kind of using Dual alkali circulation desulfurization system, it is characterised in that: first spray is de- Sulphur unit, the second spray desulfurization unit and third spray desulfurization unit include the spray unit (32) for spray, the spray Leaching unit (32) includes first annular pipe (321), the second ring pipe (324), straight tube (323) for being integrally formed and being interconnected, And it is detachably fixed and is mounted on the first annular pipe (321), the second ring pipe (324), multiple spray heads on straight tube (323) (322);
The first spray desulfurization unit, the second spray desulfurization unit bottom are provided with collector unit (33), the collector unit (33) include the closed collecting tank (334) being fixedly connected with tower body (31) inner wall, be arranged on the closed collecting tank (334) useful In the through-hole of gas circulation, fixed be tightly connected in the through-hole edge has air guide column (333), and air guide column (333) upper end is solid Surely the liquid that being connected with prevents spray unit (32) from spraying enters the screening liquid cover (331) in the air guide column (333), the screening liquid The gap for gas evolution is provided between cover (331) and the air guide column (333).
4. according to claim 3 a kind of using Dual alkali circulation desulfurization system, it is characterised in that: the lye circulatory pool Including independent first circulation pond (41), second circulation pond (42) and third circulatory pool (43), the lye circulated sprinkling pump packet Include three-level circulated sprinkling pump (51), secondary cycle spray pump (52) and primary cycle spray pump (53);The three-level circulated sprinkling The input end of pump (51) is connected to first circulation pond (41), and outlet end sprays desulfurization list with metathesis reactor (11) and third respectively Member connection;The input end of the secondary cycle spray pump (52) is connected to second circulation pond (42), and outlet end is connected to the second feed liquor Mouth (39);The input end of the primary cycle spray pump (53) is connected to third circulatory pool (43), and outlet end is respectively communicated with displacement First into the night mouthful (40) of reactor (11) and the first spray desulfurization unit;It is equipped in the first circulation pond (41) for controlling Make the second liquid level self-controller (20) of the three-level circulated sprinkling pump (51);
First collection port (34) is connected to the third circulatory pool (43), and the second collection port (35) is respectively communicated with first circulation pond (41) and second circulation pond (42), by being arranged in first circulation between the first circulation pond (41) and the second collection port (35) The second pH value automatic controller (18) in pond (41) controls opening and closing, and third collection port (37) is connected to first circulation pond (41).
5. a kind of technique using Dual alkali circulation desulfurization, it is characterised in that: real using desulphurization system described in claim 4 It is existing, specifically include following processing step:
S001 supplies gas step: sulphur-containing exhaust gas (1) be sent into eddy flow absorption tower (3) to participate in desulfurization anti-by exhaust gas air-introduced machine (2) It answers;
S002 desulfurized step: sulphur-containing exhaust gas (1) from eddy flow absorption tower (3) bottom enter, pass sequentially through third spray desulfurization unit, Second spray desulfurization unit and first spray desulfurization unit with from lye circulated sprinkling pump (5) will be in lye circulatory pool (4) Sodium hydroxide lye carry out atomizing spray desulphurization reaction after be positioned close to exhaust tube (8) position demister purification foam removal After be discharged into atmosphere;Desulfurization product flows into lye circulatory pool (4) storage;
S003 replaces reaction step: the desulfurization product in step S002 in lye circulatory pool (4) is sent into metathesis reactor (11) In occur with oxygen of the lime in lime storage tank (14) in water and the large quantity of air being passed through from high pressure blower (13) Displacement reaction, generates alkaline solution of sodium hydroxide and calcium sulfate;
S004 circulation desulfurization: the alkaline solution of sodium hydroxide supernatant generated in metathesis reactor (11) in step S003 is passed through Sodium hydroxide solution is recycled back to participation in lye circulatory pool (4) after overflow liquid filter (9) filtering and repetition step S002 is de- Sulphur step and S003 replace reaction step;
S005 recycling step: the semi-solid/solid in step S003 in metathesis reactor (11) and overflow liquid filter (9) is residual Slag is sent into calcium sulfate slag filter (15) after filtering, and liquids recovery enters lye circulatory pool (4) and repeats to participate in step S002 Desulfurized step and S003 replace reaction step;Solid calcium sulphate slag is obtained simultaneously.
6. a kind of technique using Dual alkali circulation desulfurization according to claim 5, it is characterised in that: S002 desulfurized step Specific desulfurization spray the following steps are included:
S0021 will be located at the alkaline solution that the pH value in first circulation pond (41) is 7-9 by three-level circulated sprinkling pump (51) and distinguish A portion is transported to and carries out spray atomizing in third spray desulfurization unit, is introduced with by exhaust gas air-introduced machine (2) In eddy flow absorption tower (3) sulphur-containing exhaust gas (1) reaction, slough the sulfur dioxide gas in sulphur-containing exhaust gas (1), after reaction solution by It collects in first circulation pond (41);Another part is sent into metathesis reactor (11), is used for displacement reaction;
Sodium hydroxide solution of the S0022 by secondary cycle spray pump (52) by pH value in second circulation pond (42) greater than 13 is transported to It is further that sulfur dioxide gas remaining after reacting in spray atomizing and step S0021 is carried out in the second spray desulfurization unit Reaction, the solution after reaction is divided into two-way and passes through first circulation pond (41) and second circulation pond (42) collection respectively, for step Second of recycling of S0021;Wherein, it is additionally provided between the secondary cycle spray pump (52) and the second spray desulfurization unit First pH value automatic controller (17), when secondary cycle spray pump (52) conveying lye pH value is lower than 13, by opening PH certainly Sodium hydroxide solution of the pH value greater than 13 configured in Alkali liquid compounding slot (7) is sent into the second spray desulfurization by dynamic adder-subtractor (6) In unit;Conversely, the first pH value automatic controller (17) closes the PH automatic alkali adding device (6);
Clear water in third circulatory pool (43) is respectively delivered to the first spray desulfurization list by primary cycle spray pump (53) by S0023 Calcium slag is washed in member and metathesis reactor (11);Wherein, it is arranged between metathesis reactor (11) and primary cycle spray pump (53) There are the first liquid level self-controller (19), when displacement reaction (11) interior liquid level reaches preset value, first liquid level is controlled automatically Device (19) processed is closed;Gas after step S0022 reaction is passed through atomizing spray by the clear water into the first spray desulfurization unit Chalk dust removing is removed, discharged after removing the foam that gas carries finally by demister and completes desulfurized step.
7. a kind of technique using Dual alkali circulation desulfurization according to claim 6, it is characterised in that: S003 displacement reaction The specific replacement process of step is as follows:
Step S0031 will pump (51) for the desulfurization product in first circulation pond (41) by three-level circulated sprinkling in step S0021 It is sent into metathesis reactor (11) to occur to replace to react with the lime in lime storage tank (14) and generates sodium hydroxide, sulfurous Sour calcium and calcium sulfate.
Large quantity of air is passed through in metathesis reactor (11) by step S0032 high pressure blower (13), oxidation reaction occurs, by step Calcium sulfite oxidation in S0031 obtains alkaline solution of sodium hydroxide and calcium sulfate at calcium sulfate.Then with from primary cycle Spray pump (53) is washed the clear water in third circulatory pool (43) thoroughly.
8. a kind of technique using Dual alkali circulation desulfurization according to claim 5, it is characterised in that: overflow in step S004 Flow liquid filter (9) is filtered using vacuum filter.
9. a kind of technique using Dual alkali circulation desulfurization according to claim 5, it is characterised in that: step S005 is also wrapped It includes and the semi-solid/solid residue in metathesis reactor (11) is sent into calcium sulfate slag filter (15) afterwards by type washing trough (12) In clear water carry out high pressure washing the step of.
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