CN100435910C - Fume desulfurizing process employing multiple circulation and stable double alkali method and apparatus - Google Patents
Fume desulfurizing process employing multiple circulation and stable double alkali method and apparatus Download PDFInfo
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- CN100435910C CN100435910C CNB2006100348871A CN200610034887A CN100435910C CN 100435910 C CN100435910 C CN 100435910C CN B2006100348871 A CNB2006100348871 A CN B2006100348871A CN 200610034887 A CN200610034887 A CN 200610034887A CN 100435910 C CN100435910 C CN 100435910C
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Abstract
The present invention relates to a smoke desulfurization technology by a multiple circulation and stable double alkali method, which belongs to the technical field of air pollution control and treatment. The present invention is characterized in that the technology comprises multiple circulation systems of an internal recycling of desulfurizing absorption liquid, an external recycling of desulfurizing absorption liquid, an internal recycling of desulfurizing slag, an external recycling of desulfurizing slag and an internal recycling of a desulfurizing agent. The present invention also relates to a device for the smoke desulfurization technology by the multiple circulation and stable double alkali method, and has the characteristics of reliable technology, lower investment, high desulfurization rate and low operating cost.
Description
Technical field
The present invention relates to the field of Air Pollution Control and improvement, especially relate to a kind of Multiple Cycle stable double alkali method flue gas desulfurization technique.The invention still further relates to the device of realizing this Multiple Cycle stable double alkali method flue gas desulfurization technique.
Background technology
Britain in 1850 take to the research of flue gas desulfurization technique, and first desulfurization project of beginning in 1931 has thirties kinds of desulfur technologies at present in the world.Whether regeneration is divided into do not regenerate desulfur technology and regenerative sulfur binding technology two big classes to desulfur technology according to sulfur dioxide, and the desulfur technology of not regenerating is divided into wet type desulfurizing technology, half dry type desulfur technology and dry type desulfurizing technology.The wet type desulfurizing technology is the desulfur technology of unique in the world large-scale commercial applications application, and the wet type desulfurizing technology mainly refers to limestone-gypsum method, two alkaline process, magnesium oxide method, sodium method, ammonia process etc.Two alkaline process are owing to adopting soda and two kinds of alkali of calcium alkali to gain the name, and wherein soda solution is used to absorb sulfur dioxide, and lime is used to regenerate and absorbs solution behind the sulfur dioxide.
Application number is 03141594.6, and mandate is for public number that the Chinese patent of CN 1212879C discloses " concentrated base double alkali method flue gas desulfurization technology ".Double alkali method desulfurizing technology uses and contains the flue gas that the higher sodium sulfite solution flushing of concentration contains sulfur dioxide, and sulfur dioxide and sodium sulfite reaction generate sodium hydrogensulfite, so plate column and packed tower have extensively been adopted in the absorption tower; The solution of sodium bisulfite that reaction generates is incorporated in the container absorption tower outside and generates sodium sulfite and calcium sulfite with lime reaction, and the mixed liquor of sodium sulfite and calcium sulfite is abandoned after passing through processed.Common double alkaline process efficient is higher, can reach about 70%, plate column or packed tower are adopted in the absorption tower, the concentrated base double alkali method flue gas desulfurization technology is because the very high high desulfurization slag simultaneously of oxidation side reaction that causes of the interior concentration of sodium sulfite of tower is carried the sodium salt of high concentration secretly, therefore need in system, replenish a large amount of sodas, whenever remove 1mol sulfur dioxide and need replenish soda 0.2mol, so operating cost is very high; The common double alkaline process also exists system balancing to destroy easily, system's fluctuation of service, and desulfurization slag is difficult, and the lime utilization rate is low, tower internals maintenance difficult, shortcomings such as the easy fouling obstruction of reaction tank.
Summary of the invention
Technical problem to be solved by this invention provides that a kind of technology is reliable, investment is lower, desulfurization degree height, the Multiple Cycle stable double alkali method sulfur removal technology that operating cost is low.
Another technical problem to be solved by this invention provides the device of realizing above-mentioned Multiple Cycle stable double alkali method sulfur removal technology.
The technical scheme that technical problem adopted that the present invention solves: Multiple Cycle stable double alkali method flue gas desulfurization technique, it comprises the Multiple Cycle system of desulfurization absorption liquid inner loop, desulfurization absorption liquid outer loop, desulfurization slag inner loop, desulfurizing agent inner loop and desulfurization slag outer loop;
Described desulfurization absorption liquid inner loop, the desulfurization absorption liquid circulates in the absorption tower, form waste gas of sulfur dioxide is carried out three grades of desulfurization absorption reactions with the desulfurization absorption liquid in the absorption tower, finish the absorption process of SO 2 from fume, the mixed liquor that mainly contains sodium sulfite, sodium hydrogensulfite, NaOH and oxygen-inhibiting agent that effective constituent is a concentration stabilize of described desulfurization absorption liquid;
Described doctor solution outer loop with the partial desulfurization liquid pump of the bottom column still on absorption tower to the one-level regeneration reactor, finish the regeneration of fresh sodium sulfite and NaOH through one-level regeneration reactor, secondary regeneration reactor, high-efficiency clarifier and blender, the doctor solution after will regenerating again is evacuated in the absorption tower from blender; Add oxygen-inhibiting agent in the outer loop process of described doctor solution;
Described desulfurization slag inner loop returns the part slag of high-efficiency clarifier to the secondary regeneration reactor;
Described desulfurizing agent inner loop joins the one-level regeneration reactor with lime stone, and lime joins the secondary regeneration reactor, and lime joins high-efficiency clarifier mud layer middle part;
Described desulfurization slag outer loop is finished processed with the part slag of high-efficiency clarifier bottom with the vacuum belt dewaterer, and filtrate is returned clarifier and recycled.
The pH value of the desulfurization absorption liquid in the above-mentioned desulfurization absorption liquid inner loop is controlled to be 5.5～6.8, and wherein sodium sulfite solubility is controlled to be 0.2～0.02mol/L, and desulfurization absorption liquid inner loop amount is 3～4L/Nm with the ratio of flue gas
3
Three grades of desulfurization in the above-mentioned desulfurization absorption liquid inner loop: described absorption tower entrance side carries out first grade desulfurizing to the chilling spraying layer with flue gas; Enter absorption tower inner bottom part grid turbosphere through the flue gas after the first grade desulfurizing and carry out the secondary desulfurization; Enter through the flue gas after the secondary desulfurization that spraying layer carries out three grades of desulfurization in the absorption tower; Two-layer folded plate type demister is adopted at top, described absorption tower, reduces entrainment.
The outer loop amount of above-mentioned doctor solution is a desulfurization absorption liquid inner loop amount 30～50%.
Above-mentioned oxygen-inhibiting agent is any or several in ethylenediamine tetra-acetic acid (writing a Chinese character in simplified form EDTA), organic amine or the hydroquinones, and the concentration of oxygen-inhibiting agent is controlled at 15～50ppm in the described desulfurization absorption liquid.
In the above-mentioned desulfurizing agent inner loop, the weight proportion of described desulfurizing agent is 30% lime stone and 70% lime, the pH value of control one-level regeneration reactor is 6.0～6.5, and the pH value of secondary regeneration reactor is 9～12, efficient classifying separator clear liquid pH value 9～12.
The technical scheme that another technical problem adopted that the present invention solves:
Realize the device of above-mentioned Multiple Cycle stable double alkali method flue gas desulfurization technique, described device comprises:
At least one absorption tower, the tower still doctor solution outlet of bottom, described absorption tower is connected with the inlet of circulating pump with middle part, described absorption tower by conduit;
A lime stone dissolving tank;
An one-level regeneration reactor, its three feeding mouths are connected with two the doctor solution discharging openings of the tower still of bottom, described sulfur dioxide absorption tower and the discharging opening of described lime stone dissolving tank by conduit, conduit and circulating pump, conduit and circulating pump respectively;
A lime white flow container;
A secondary regeneration reactor, its feeding mouth are communicated with the discharging opening of described one-level regeneration reactor respectively and are communicated with the discharging opening of described lime white flow container by conduit and circulating pump;
A high-efficiency clarifier, its feeding mouth is communicated with by the discharging opening of conduit with the reaction disposed slurry of secondary regeneration reactor, and the slag of its bottom and slurries discharging opening are communicated with the inlet of secondary regeneration reactor by conduit and pump;
A vacuum belt dewaterer, its feeding mouth is connected with the slurries discharging opening with the slag of high-efficiency clarifier with circulating pump by conduit, its filtrate discharging opening is communicated with the slurries feeding mouth of high-efficiency clarifier by conduit, and it also is provided with the slag notch of a desulfurization slag to transportation;
An oxygen-inhibiting agent basin;
An alkali liquid tank;
A blender, its three feeding mouths are communicated with by the clear liquid discharging opening of conduit with the discharging opening of described oxygen-inhibiting agent basin, described alkali liquid tank discharging opening, described high-efficiency clarifier respectively, and its discharging opening is communicated with the absorption tower by conduit and circulating pump.
Above-mentioned absorption tower is made up of entrance side bottom grid turbosphere, spraying layer, top flap demist layer in chilling spraying layer, tower, described grid turbosphere is two rows, the grid opening rate is 30～70%, described grid is made up of steel tubes, and described steel tube section is oval, square or water droplet shape.
Above-mentioned high-efficiency clarifier adopts circular configuration, and periphery is provided with the inlet opening, and the centre is provided with apopore, and the center is provided with a Slag Scraping Device.
Above-mentioned high-efficiency clarifier, one-level regeneration reactor, secondary regeneration reactor and blender divide height layout up and down, and to efficient clarifier, described high-efficiency clarifier clear liquid can flow to blender to described secondary regeneration reactor slurries certainly by the difference in height gravity flow.
Above-mentioned lime white flow container is communicated with limeslaker and water source by conduit, and described limeslaker is communicated with the pulverized limestone basin.
Above-mentioned lime stone dissolving tank is communicated with agstone basin and water source by conduit.
Beneficial effect of the present invention:
The present invention adopts lime stone and two kinds of calcium alkali of lime, can reduce the consumption of 30% lime; Add oxygen-inhibiting agent in the doctor solution, avoided the oxidation of sodium sulfite solution in the circulation fluid, the oxidation that has significantly reduced owing to sodium sulfite needs additional soda consumption; Lime is sprayed into high-efficiency clarifier sludge blanket middle part, and the desulfurization slag of high-efficiency clarifier bottom is back to the secondary regeneration reactor, has prolonged the regenerative response time of lime, has improved the utilization rate of lime; Therefore operating cost of the present invention is 50% of conventional two alkaline process.Entrance side bottom grid turbosphere+spraying layer structure in chilling spraying layer+tower is adopted on the absorption tower, and desulfuration efficiency is up to 99%, non flouling behaviour and obstruction in the tower, and the tower internals dismounting and change is convenient, and equipment operation availability is up to 98%; The folded plate type demister is adopted at the top, absorption tower, and demist efficient height has reduced the entrainment in the flue gas, has reduced the consumption of water in the desulphurization system.Desulfurization regeneration adopts the series operation pattern of one-level regeneration reactor+secondary regeneration reactor+high-efficiency clarifier, sodium sulfite regeneration fully, high-efficiency clarifier solid-liquid separation efficiency height, calcium ion concentration is low in the doctor solution after the regeneration, has avoided in the tower because the fouling that the enrichment of calcium sulfite causes.Desulfurization slag inner loop of the present invention returns the slag of high-efficiency clarifier to the secondary regeneration reactor, improves the concentration of secondary regeneration reactor, prolongs the reaction time of lime; Desulfurization slag adopts the vacuum belt dewaterer to filter, and desulfurization slag moisture less than 10% significantly reduced the useful soda solution of carrying secretly in the desulfurization slag, and vacuum belt dewaterer operation is convenient, the efficient height.The present invention is by the Multiple Cycle of desulfurization absorption liquid inner loop, desulfurization absorption liquid outer loop, desulfurization slag inner loop, desulfurizing agent inner loop, desulfurization slag outer loop, technological process is rationally advanced, stable and reliable operation, the efficient height, operating cost is low, invests low, the automaticity height, easy to operate, working condition is good, can be widely used in the purified treatment of industry form waste gas of sulfur dioxide such as power plant, chemical plant, smeltery.Exhaust gas volumn 10000～the 1900000Nm that handles
3/ h, sulfur dioxide in flue gas concentration is at 500～15000mg/Nm
3, flue-gas temperature is at 50～300 ℃ the form waste gas of sulfur dioxide that contains.
High-efficiency clarifier of the present invention, one-level regeneration reactor, secondary regeneration reactor and blender divide height layout up and down, to efficient clarifier, described high-efficiency clarifier clear liquid can flow to blender to described secondary regeneration reactor slurries certainly by the difference in height gravity flow.Can save the locus and save the energy.
Below in conjunction with the drawings and specific embodiments the present invention is described
Description of drawings
Process chart of the present invention is seen shown in the accompanying drawing 1.
Among the figure, 1-pulverized limestone basin, 2-limeslaker, 3-lime white flow container, 4-agstone basin, 5-lime stone dissolving tank, 6-oxygen-inhibiting agent basin, 7-soda flow container, 8-blender, 9-absorption tower, 10-one-level regenerative response, 11-secondary regeneration reactor, 12-high-efficiency clarifier, 13-vacuum belt dewaterer, 14-chimney.
Such as the device of the Multiple Cycle stable double alkali method flue gas desulfurization of Fig. 1, described device comprises:
An absorption tower 9, the tower reactor desulfurization absorption liquid outlet of 9 bottoms, described absorption tower is by conduit and circulating pump and described The entrance at 9 middle parts, absorption tower connect; Described absorption tower is by entrance side bottom grid turbulent flow in chilling spraying layer, the tower Layer, spraying layer, top flap demist layer form, and described grid turbosphere is two rows, and the grid opening rate is 30～70%, described grid is made up of steel tubes, and described steel tube section is oval, square or water-drop-shaped.
An agstone basin 4
A lime stone dissolving tank 5, it is communicated with agstone basin 4 and water source respectively by conduit;
An one-level regeneration reactor 10, its three feeding mouths pass through respectively conduit or/and conduit and circulating pump and described 9 bottoms, absorption tower tower reactor two doctor solution discharging openings be connected the discharging opening of lime stone dissolving tank 5 and connect;
A pulverized limestone basin 1;
A limeslaker 2, it is communicated with pulverized limestone basin 1 and water source by conduit;
A lime white flow container 3; It is communicated with limeslaker 2 and water source by conduit;
A secondary regeneration reactor 11, its feeding mouth is communicated with respectively the discharging opening of described one-level regeneration reactor 10 Be communicated with the discharging opening of described lime white flow container 3 by conduit and pump;
A high-efficiency clarifier 12, its entrance connects by the outlet of the reaction disposed slurry of conduit and secondary regeneration reactor 11 Logical, the slag of its bottom and slurries discharging opening are communicated with the entrance of secondary regeneration reactor 11 by conduit and pump; Described High-efficiency clarifier adopts circular configuration, and periphery is provided with the inlet opening, and the centre is provided with apopore, and the center arranges a Slag Scraping Device.
A vacuum belt dewaterer 13, its feeding mouth is by slag and the slurry of conduit and circulating pump and high-efficiency clarifier 12 The liquid discharging opening connects, and its filtrate discharging opening is communicated with the slurries feeding mouth of high-efficiency clarifier 12 by conduit, and it is provided with one Individual desulfurization slag is to the slag notch of transportation;
An oxygen-inhibiting agent basin 6;
An alkali liquid tank 7;
A blender 8, its three feeding mouths be the discharging opening by conduit and described oxygen-inhibiting agent basin 6, described respectively The clear liquid discharging opening of alkali liquid tank 7 discharging openings, described high-efficiency clarifier 12 be communicated with, its discharging opening connects by pump and conduit Logical sulfur dioxide absorbing tower 9.
A chimney 14, the flue gas after desulfurization drains into chimney 14 by 9 tops, absorption tower.
Described high-efficiency clarifier, one-level regeneration reactor, secondary regeneration reactor and blender divide up and down height layout, To efficient clarifier, described high-efficiency clarifier clear liquid can be certainly by the difference in height gravity flow for described secondary regeneration reactor slurries Flow to blender.
The specific embodiment:
We have carried out 2 * 240t/h coal burning flue gas desulfurization engineering experiment in certain power plant, smoke treatment amount 2 * 270000Nm
3/ h, sulfur dioxide in flue gas concentration 1600mg/Nm
3, sulfur dioxide absorption efficiency 96%, desulphurization cost is that every degree electricity increases by 0.6 fen of cost of electricity-generating.Two of capital equipment: DN6000 * 23000mm absorption tower, blender 200m
3, one-level regeneration reactor 120m
3, secondary regeneration reactor 120m
3, high-efficiency clarifier 800m
3, 10m
2One of vacuum belt dewaterer.
(1) desulfurization absorption liquid inner loop
Two of DN6000 * 23000mm absorption tower are set, the flue gas that comes out from boiler induced-draft fan enters chimney through entrance side bottom grid turbosphere, spraying layer, top flap demist layer in chilling spraying layer, tower after finishing the desulfurization demist, and the key reaction of carrying out in the absorption tower is:
Side reaction is:
Owing in doctor solution, added oxygen-inhibiting agent EDTA, so suppressed the side reaction of reaction equation (3) and (4).
The bottom, absorption tower is made as 3 meters high tower still, and every absorption tower is provided with 2 of chilling spray circulating pumps on the spot, and every absorption tower is provided with 3 of spray circulating pumps on the spot, and the global cycle amount is 1200m
3/ h, absorption tower tower bottoms pH value is 6, the concentration of sodium sulfite is 0.1mol/L.Extract 500m
3The tower bottoms of/h to one-level regeneration reactor 10 carries out the absorption liquid outer loop.Entrance side carries out first grade desulfurizing to the chilling spraying layer with flue gas, and flue-gas temperature is reduced to 60 ℃ by 130 ℃, and first grade desulfurizing efficient can reach 20%.Enter tower inner bottom part grid spraying layer through the flue gas after the first grade desulfurizing and carry out the secondary desulfurization, grid is made up of two rows, and grid lower floor percent opening is 60%, and the upper strata percent opening is 50%.Flue gas upwards flows when passing grid, because cross-sectional constriction, flue gas flow rate is accelerated, the gas shock that the liquid of grid surface is made progress at a high speed, doctor solution is broken up by flue gas and forms countless drops, at grid layer top turbulization layer, has strengthened the process of sulfur dioxide absorption mass transfer.Redistribute through flue gas behind the grid, make flue gas being more evenly distributed at the middle part, absorption tower.Grid spraying layer desulfurization degree can reach 20%.The middle part, absorption tower is provided with three layers of spraying layer, and spraying layer adopts 200% absorption liquid to cover, and adopts the low pressure spiral nozzle, quick-detach and replacing soon, the spraying layer absorption efficiency can reach 90%, and two-layer folded plate type demister is adopted at the top, absorption tower, reduced entrainment, made the moisture of flue gas less than 100mg/m
3Sulfur dioxide absorption tower gross efficiency is greater than 96%, and SR is less than 1000Pa.
(2) desulfurization absorption liquid outer loop
From desulfuration absorbing tower 9 tower bottoms, extract 500m
3The doctor solution of/h extracts 500m to the one-level regeneration reactor from blender 8
3Doctor solution after the regeneration of/h is to absorbing the Tata still, in one-level regeneration reactor 10, add the lime stone slurry in the lime stone dissolving tank 5, reacted slurries are from flowing to secondary regeneration reactor 11, add the lime slurry in the lime white flow container 3 in the secondary regeneration reactor, the slurries gravity flow of secondary regeneration reactor is to efficient clarifier.In blender 8, add the EDTA in the oxygen-inhibiting agent basin 6, add the soda lye in the soda NaOH solution tank NaOH 7 simultaneously.Each 4 of mechanical agitator and submersible agitators are set in regeneration reactor.
The key reaction of carrying out in the one-level regeneration reactor is:
CaCO
3+2NaHSO
3＝CaSO
3+Na
2SO
3+CO
2+H
2O (5)
The key reaction of carrying out in the secondary regeneration reactor is:
High-efficiency clarifier is a circular configuration, and the slurries that come out from the secondary regeneration reactor enter from the clarifier periphery, and after sufficient Separation of Solid and Liquid and clarification, clear liquid flow to blender 8 certainly from clarifier middle part water leg.The clarifier center is provided with one of Slag Scraping Device, and the Slag Scraping Device setting is two scraper plates up and down, and the body refuse of clarifier periphery is scraped sludge hopper to the bottom, and the scraper plate in the sludge hopper prevents the fouling of body refuse.
(3) desulfurization slag inner loop
The slag of high-efficiency clarifier 12 bottoms is evacuated to the secondary regeneration reactor by slush pump, and unreacted lime is proceeded reaction in the secondary regeneration reactor.Control secondary regeneration reactor concentration of slurry is 20%, and desulfurization slag inner loop amount is 200m
3/ h.
(4) desulfurizing agent inner loop
9 tower bottoms extract the doctor solution of pH5～6 of coming to one-level regeneration reactor 10 from the absorption tower, lime stone is joined in the one-level regeneration reactor, lime stone solubility in acid solution strengthens, the reaction fierceness of lime stone and sodium hydrogensulfite, the carbon dioxide that produces has been accelerated the stirring of slurries, accelerate the speed of reaction, prevented the fouling and the precipitation of the slag in the reactor.Slurries part in the lime white flow container 3 is joined in the second reactor, and a part joins the mud layer of high-efficiency clarifier 12, and the slag of bottom of clarifier is evacuated to by pump again and does not stop circulation in the second reactor, has prolonged the reaction time of lime.The amount of the lime stone that control adds according to the pH value of A reactor 10 is according to the amount of the pH value control adding lime of second reactor.
(5) desulfurization slag outer loop
The desulfurization slag of high-efficiency clarifier 12 bottoms is back to the secondary regeneration reactor by the pump some, some to vacuum belt dewaterer 13 carries out processed, slag after the processing is moisture 10% powdery solid, and filtered fluid is back to the slurries inlet clarification separation once more of high-efficiency clarifier 12 again.
Claims (10)
1, Multiple Cycle stable double alkali method flue gas desulfurization technique is characterized in that: it comprises the Multiple Cycle system of desulfurization absorption liquid inner loop, desulfurization absorption liquid outer loop, desulfurization slag inner loop, desulfurizing agent inner loop and desulfurization slag outer loop;
Described desulfurization absorption liquid inner loop, the desulfurization absorption liquid circulates in the absorption tower, form waste gas of sulfur dioxide is carried out three grades of desulfurization absorption reactions with the desulfurization absorption liquid in the absorption tower, finish the absorption process of SO 2 from fume, the mixed liquor that mainly contains sodium sulfite, sodium hydrogensulfite, NaOH and oxygen-inhibiting agent that effective constituent is a concentration stabilize of described desulfurization absorption liquid;
Described doctor solution outer loop with the partial desulfurization liquid pump of the bottom column still on absorption tower to the one-level regeneration reactor, finish the regeneration of fresh sodium sulfite and NaOH through one-level regeneration reactor, secondary regeneration reactor, high-efficiency clarifier and blender, the doctor solution after will regenerating again is evacuated in the absorption tower from blender; Add oxygen-inhibiting agent in the outer loop process of described doctor solution;
Described desulfurization slag inner loop returns the part slag of high-efficiency clarifier to the secondary regeneration reactor;
Described desulfurizing agent inner loop joins the one-level regeneration reactor with lime stone, and lime joins the secondary regeneration reactor, and lime joins high-efficiency clarifier mud layer middle part;
Described desulfurization slag outer loop is finished processed with the part slag of high-efficiency clarifier bottom with the vacuum belt dewaterer, and filtrate is returned clarifier and recycled.
2, Multiple Cycle stable double alkali method flue gas desulfurization technique according to claim 1, it is characterized in that: the pH value of the desulfurization absorption liquid in the described desulfurization absorption liquid inner loop is controlled to be 5.5～6.8, wherein sodium sulfite solubility is controlled to be 0.2～0.02mol/L, and desulfurization absorption liquid inner loop amount is 3～4L/Nm with the ratio of flue gas
3
3, Multiple Cycle stable double alkali method flue gas desulfurization technique according to claim 1, it is characterized in that: three grades of desulfurization in the described desulfurization absorption liquid inner loop are that described absorption tower entrance side carries out first grade desulfurizing to the chilling spraying layer with flue gas, enter absorption tower inner bottom part grid turbosphere through the flue gas after the first grade desulfurizing and carry out the secondary desulfurization, enter through the flue gas after the secondary desulfurization that spraying layer carries out three grades of desulfurization in the absorption tower; Two-layer folded plate type demister is adopted at top, described absorption tower, reduces entrainment.
4, Multiple Cycle stable double alkali method flue gas desulfurization technique according to claim 1 is characterized in that: the outer loop amount of described doctor solution is a desulfurization absorption liquid inner loop amount 30～50%.
5, according to the described Multiple Cycle stable double alkali method of claim 1 flue gas desulfurization technique, it is characterized in that: described oxygen-inhibiting agent is any or several in ethylenediamine tetra-acetic acid, organic amine or the hydroquinones, and the concentration of oxygen-inhibiting agent is controlled at 15～50ppm in the described desulfurization absorption liquid.
6, according to the described Multiple Cycle stable double alkali method of claim 1 flue gas desulfurization technique, it is characterized in that: in the described desulfurizing agent inner loop, the weight proportion of described desulfurizing agent is 30% lime stone and 70% lime, the pH value of control one-level regeneration reactor is 6.0～6.5, the pH value of secondary regeneration reactor is 9～12, efficient classifying separator clear liquid pH value 9～12.
7, realize the device of the described Multiple Cycle stable double alkali method of claim 1 flue gas desulfurization technique, it is characterized in that described device comprises:
At least one absorption tower (9), the tower still doctor solution outlet of described absorption tower (9) bottom is connected with the inlet of circulating pump with described absorption tower (9) middle part by conduit;
A lime stone dissolving tank (5);
An one-level regeneration reactor (10), its three feeding mouths are connected by two the doctor solution discharging openings of conduit, conduit and circulating pump, conduit and the circulating pump tower still bottom described sulfur dioxide absorption tower (9) and the discharging opening of described lime stone dissolving tank (5) respectively;
A lime white flow container (3);
A secondary regeneration reactor (11), its feeding mouth are communicated with the discharging opening of described one-level regeneration reactor (10) respectively and are communicated with the discharging opening of described lime white flow container (3) by conduit and circulating pump;
A high-efficiency clarifier (12), its feeding mouth is communicated with by the discharging opening of conduit with the reaction disposed slurry of secondary regeneration reactor (11), and the slag of its bottom and slurries discharging opening are communicated with the inlet of secondary regeneration reactor (11) by conduit and pump;
A vacuum belt dewaterer (13), its feeding mouth is connected with the slurries discharging opening with the slag of high-efficiency clarifier (12) with circulating pump by conduit, its filtrate discharging opening is communicated with by the slurries feeding mouth of conduit with high-efficiency clarifier (12), and it also is provided with the slag notch of a desulfurization slag to transportation;
An oxygen-inhibiting agent basin (6);
An alkali liquid tank (7);
A blender (8), its three feeding mouths are communicated with by the clear liquid discharging opening of conduit with the discharging opening of described oxygen-inhibiting agent basin (6), described alkali liquid tank (7) discharging opening, described high-efficiency clarifier (12) respectively, and its discharging opening is communicated with absorption tower (9) by conduit and circulating pump.
8, device according to claim 7, it is characterized in that: described absorption tower (9) are made up of entrance side bottom grid turbosphere, spraying layer, top flap demist layer in chilling spraying layer, tower, described grid turbosphere is two rows, the grid opening rate is 30～70%, described grid is made up of steel tubes, and described steel tube section is oval, square or water droplet shape.
9, device according to claim 7 is characterized in that: described high-efficiency clarifier adopts circular configuration, and periphery is provided with the inlet opening, and the centre is provided with apopore, and the center is provided with a Slag Scraping Device.
10, device according to claim 7, it is characterized in that, described high-efficiency clarifier, one-level regeneration reactor, secondary regeneration reactor and blender divide height layout up and down, to efficient clarifier, described high-efficiency clarifier clear liquid can flow to blender to described secondary regeneration reactor slurries certainly by the difference in height gravity flow.
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| CN101347712B (en) * | 2008-08-21 | 2011-12-07 | 浙江菲达环保科技股份有限公司 | Novel sodium-method desulfurizing tower |
| CN101444699B (en) * | 2008-12-16 | 2011-04-13 | 刘存宝 | Technical method for removing sulfur dioxide in flue gas by using sodium sulfite and equipment thereof |
| CN101703861B (en) * | 2009-08-24 | 2012-07-04 | 李鹏举 | Process and device for desulphurizing flue gas by lime-gypsum method |
| CN102000481B (en) * | 2009-08-31 | 2012-10-10 | 宝山钢铁股份有限公司 | Method for treating desulfurization ash |
| CN101879406B (en) * | 2010-07-15 | 2011-05-25 | 煤炭工业济南设计研究院有限公司 | Dual-alkali flue gas desulfurization device and desulfurization method |
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