CN101543729B - Method suitable for utilization of resource of sintering flue gas desulphurization waste solution - Google Patents
Method suitable for utilization of resource of sintering flue gas desulphurization waste solution Download PDFInfo
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- CN101543729B CN101543729B CN2009100299455A CN200910029945A CN101543729B CN 101543729 B CN101543729 B CN 101543729B CN 2009100299455 A CN2009100299455 A CN 2009100299455A CN 200910029945 A CN200910029945 A CN 200910029945A CN 101543729 B CN101543729 B CN 101543729B
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- ammonium sulfate
- ammonium sulphate
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Abstract
The invention relates to a method suitable for utilization of resource of sintering flue gas desulphurization waste solution, belonging to the technology of utilizing resource of desulphurization waste solution for atmospheric pollution control in the environmental protection field. Desulphurization waste solution is delivered into a vortex separator (2) through an ammonium sulphate slurry pump (1) and a pipeline system so that solid and liquid are partially separated; low-concentration ammonium sulphate solution at the upper part of the vortex separator (2) is delivered into an ammonium sulphate feed liquid pot (9) through a pipeline, and high-concentration ammonium sulphate solution at the lower part of the vortex separator (2) is delivered into a thickener (3) through a pipeline; thickened high-solid ammonium sulphate solution enters a centrifuger (4) through an overflow pipeline arranged at the bottom of the thickener (3); ammonium sulphate granules with the water content of less than 5 percent is obtained, and ammonium sulphate mother solution enters the ammonium sulphate feed liquid pot (9); the ammonium sulphate granules enter a drier (5) and are dried by the drier (5), and ammonium sulphate granules with the water content of less than 1 percent are obtained; feed liquid in the ammonium sulphate feed liquid pot (9) is low-concentration ammonium sulphate slurry which returns to a desulphurization system through a feed liquid output pump (11) and reenters a dehydrating system so that high-concentration ammonium sulphate granules are prepared.
Description
Technical field
The present invention relates to field of environment protection air contaminant treatment desulfurization waste liquor application technology as the second resource, relate in particular to steel industry sintering flue gas ammonia method desulfurizing process for treating waste liquor.
Background technology
Existing similar technological process for treating waste liquor and good and bad the analysis:
1. limestone-gypsum wet desulphurization
Adopt lime stone slurry as desulfurizing agent, remove SO
2Generation contains the calcium sulfite waste liquid, and the calcium sulfite of generation becomes calcium sulfate in the slurries pond through compressed air oxidation, generates the end product gypsum, and this method is widely used in the means of flue gas desulfurization of power plant at present.
There is following defective in this method:
1) because China's gypsum resource is abundant, the gypsum market that desulfurization produces is poor, so be abandoned basically, desulfurizing byproduct gypsum value is not high;
2) because desulfurated plaster can't utilize once more, the gypsum of bulk deposition is with land occupation and cause environmental pollution.
2 circulating fluidized bed dries
Flue gas advances the people from the bottom, absorption tower, after Venturi tube is quickened, reacts with the absorbent (calcium hydroxide), circulating ash (returning the absorption tower through the circulation skewed slot) and the water that add, removes the SO in the flue gas
x, HCl, HF, CO
2Deng gas.The generation main component is flying dust, calcium sulfite, calcium sulfate and the unreacted desulfurization ash of pulverized limestone completely.
There is following defective in this method:
1) the desulfurization ash main component of circulating fluidized bed dry is flying dust, calcium sulfite, a calcium sulfate and unreacted pulverized limestone completely, and the desulfurization ash economic worth is low, can't utilize;
2) through after fluid bed circulations up to a hundred time, noxious materials such as a large amount of heavy metal of enrichment, VOCs in the desulfurization ash are along with the increasingly stringent of environmental protection standard, even the lime-ash landfill also must be handled earlier.
Summary of the invention
Technical problem: the operation desulfurization product utilization rate that exists to above technology is low, need a large amount of places to stack, be prone to produce secondary pollution problems; The present invention proposes the method that a kind of suitable resource of sintering flue gas desulphurization waste solution utilizes; This method is utilized iron and steel enterprise's desulfurization waste liquor, mainly contains sulfurous acid (hydrogen) ammonium etc., through the fertile reparation technology of ammonium sulfate; Production ammonium sulfate is fertile; This accessory substance has not only been realized " treatment of wastes with processes of wastes against one another ", and can also have been reached the purpose of " turning waste into wealth " for making the ammonium sulfate of agricultural fertilizer.
Technical scheme: adopt desulfurization waste liquor as system ammonium sulfate raw material, the back utilizes the method for air aeration that ammonium bisulfite is oxidized to ammonium sulfate in reactor, after ammonium sulfate is discharged through producing ammonia sulfate crystal after filtration, dehydration, evaporation, the drying.Concrete grammar is following:
A). desulfurization waste liquor is delivered in the cyclone separator through supplying ammonium sulfate slush pump and pipe-line system;
B). slurries reach the part Separation of Solid and Liquid in cyclone separator, top is contained the low-concentration sulfuric acid ammonium salt solution and is transported in the ammonium sulfate material liquid tank through pipeline, and the ammonium sulfate of bottom high concentration is transported in the stiff device through pipeline;
C). the solid ammonium sulfate of the height after the thickening of stiff device gets in the centrifuge through the overflow pipe of stiff device bottom;
D). the ammonium sulfate slurries continue Separation of Solid and Liquid in centrifuge, obtain moisture content and be lower than 5% ammonium sulfate, and ammonium sulfate liquor gets into the ammonium sulfate material liquid tank;
E). ammonium sulfate gets into drying machine, and is dry through drying machine, obtains moisture content and is lower than 1% ammonium sulfate thing, and the hot-air that the thermal source of drying machine blasts through the air heater heater blower provides or directly logical steam provides;
F). the feed liquid in the ammonium sulfate material liquid tank is low-concentration sulfuric acid ammonium slurries, turns back to desulphurization system through the feed liquid rear pump, gets into dewatering system again, with the ammonium sulfate of preparation high concentration.
Beneficial effect: owing to adopted above technical scheme; Sintering flue gas ammonia method desulfurizing effluent resource of the present invention utilizes the accessory substance that technology is simple, system is reliable, utilize desulfurization waste liquor to process---and the ammonium sulfate quality is high; Can directly use as ammonium sulfate is fertile; The present invention has found the new technology of a suitable flue gas of sintering machine engineering circulation sustainable use, has reduced the overall operation expense of desulfurization project.Compare with other technologies, this technology utilization desulfurization waste liquor is prepared has higher quality, the better ammonium sulfate fertilizer of market, and the low cost that real having accomplished pursued on the flue gas of sintering machine engineering always has the target of output.This sintering device flue gas ammonia process of desulfurization effluent resource utilizes technology both to realize environmental benefit, has also realized economic benefit to a certain extent.
Description of drawings
Fig. 1 is the sketch map of sintering flue gas ammonia method desulfurizing waste liquid system ammonium sulfate of the present invention system.
Have among the figure: supply ammonium sulfate slush pump 1, cyclone separator 2, stiff device 3, centrifuge 4, drying machine 5, packing machine 6, air heater 7, air blast 8, ammonium sulfate material liquid tank 9, material liquid tank agitator 10, feed liquid rear pump 11.
The specific embodiment
A) desulfurization waste liquor is delivered in the cyclone separator 2 through supplying ammonium sulfate slush pump 1 and pipe-line system;
B) slurries reach the part Separation of Solid and Liquid in cyclone separator, and top is contained the low-concentration sulfuric acid ammonium salt solution and is transported in the ammonium sulfate material liquid tank 9 through pipeline, and the ammonium sulfate of bottom high concentration is transported in the stiff device 3 through pipeline;
C) the solid ammonium sulfate of the height after 3 thickenings of stiff device gets in the centrifuge 4 through the overflow pipe of stiff device bottom;
D) the ammonium sulfate slurries continue Separation of Solid and Liquid in centrifuge 4, obtain moisture content and are lower than 5% ammonium sulfate, and ammonium sulfate liquor gets into ammonium sulfate material liquid tank 9;
E) ammonium sulfate gets into drying machine 5, through drying machine 5 dryings, obtains moisture content and is lower than 1% ammonium sulfate thing, and the hot-air that the thermal source of drying machine 5 blasts through air heater 7 heater blowers 8 provides or directly logical steam provides;
F) use packing machine 6 that the dry moisture content that obtains is lower than 1% ammonium sulfate thing packing preservation;
G) ammonium sulfate material liquid tank 9 is used to store top low-concentration sulfuric acid ammonium salt solution and cyclone separator 2, stiff device 3, centrifuge 4 overflow slurry of cyclone separator 2; A material liquid tank agitator 10 is installed in the ammonium sulfate serum pot 9, in this equipment, is solidified to prevent slurries;
H) feed liquid in the ammonium sulfate material liquid tank 9 is low-concentration sulfuric acid ammonium slurries, turns back to desulphurization system through feed liquid rear pump 11, gets into dewatering system again, with the ammonium sulfate of preparation low-water-content.
Illustrate
Process object is one of a 198m2 sintering machine, exhaust gas volumn 800,000Nm3/h, 130 ℃ of flue-gas temperatures, SO2 concentration 1500mg/Nm3, ammonium sulfate 5.5t/h after the desulfurization (strength of fluid 15%).
Cyclone separator treating capacity 6m3/h goes into a concentration 150g/L, feed pressure 0.08～0.15MPa.Stiff device treating capacity, centrifuge processing amount 2.75t/h.Power of motor 5.5Kw.Dryer capacity 0.868t/h, ammonium sulfate output is 816.75t/h, ammonium sulfate content 99%.
The ammonium sulfate of producing has the following advantages:
1) desulfurization product ammonium sulfate quality is higher, can reach the agricultural ammonium sulfate primes of GB GB535-95 standard;
2) desulfurization product ammonium sulfate is the stronger chemical fertilizer of a kind of economy, while China's ammonium sulfate extensive market, and desulfurization ammonium sulfate has market preferably.
Claims (1)
1. method that suitable resource of sintering flue gas desulphurization waste solution utilizes is characterized in that this method may further comprise the steps:
A). the waste liquid of sintering flue gas ammonia method desulfurizing system is delivered in the cyclone separator (2) through supplying ammonium sulfate slush pump (1) and pipe-line system;
B). said desulfurization waste liquor reaches the part Separation of Solid and Liquid in cyclone separator (2); The low-concentration sulfuric acid ammonium salt solution that cyclone separator (2) top is contained is transported in the ammonium sulfate material liquid tank (9) through pipeline, and the ammonium sulfate of bottom high concentration is transported in the stiff device (3) through pipeline;
C). the thickening ammonium sulfate after stiff device (3) thickening gets in the centrifuge (4) through the overflow pipe of stiff device bottom;
D). the thickening ammonium sulfate continues Separation of Solid and Liquid in centrifuge (4), obtain moisture content and be lower than 5% ammonium sulfate, and ammonium sulfate liquor gets into ammonium sulfate material liquid tank (9);
E). ammonium sulfate gets into drying machine (5), through drying machine (5) drying, obtains moisture content and is lower than 1% ammonium sulfate thing, and the hot-air that the thermal source of drying machine (5) blasts through air heater (7) heater blower (8) provides or directly logical steam provides;
F). the feed liquid in the ammonium sulfate material liquid tank (9) is the low-concentration sulfuric acid ammonium salt solution, turns back to the system of the described sintering flue gas ammonia method desulfurizing of step a) through feed liquid rear pump (11), and dehydration again is with the ammonium sulfate of preparation high concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100299455A CN101543729B (en) | 2009-03-25 | 2009-03-25 | Method suitable for utilization of resource of sintering flue gas desulphurization waste solution |
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|---|---|---|---|
| CN2009100299455A CN101543729B (en) | 2009-03-25 | 2009-03-25 | Method suitable for utilization of resource of sintering flue gas desulphurization waste solution |
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| Publication Number | Publication Date |
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| CN101543729A CN101543729A (en) | 2009-09-30 |
| CN101543729B true CN101543729B (en) | 2012-03-21 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102976357B (en) * | 2012-12-28 | 2014-08-13 | 安徽工业大学 | Method for extracting ammonium sulfate from ammonia desulphurization wastewater by oxidation process |
| CN103011201B (en) * | 2012-12-28 | 2014-06-18 | 安徽工业大学 | Method for extracting ammonium thiocyanate from ammonia-process desulfurization waste liquid by oxidation process |
| CN103588340B (en) * | 2013-11-27 | 2014-12-24 | 安徽工业大学 | Method for treating sodium-alkali desulfurization waste liquid by causticization-acidification method |
| CN103896420B (en) * | 2014-04-13 | 2015-09-09 | 石家庄市西姆克科技有限责任公司 | Desulfurization wastewater treatment system and method |
| CN104671258A (en) * | 2015-01-22 | 2015-06-03 | 张波 | Method for producing compound fertilizer by using byproduct ammonium sulfate generated during ammonia-process desulfurizing of flue gas of boiler |
| CN108514754A (en) * | 2018-03-29 | 2018-09-11 | 昆山三环保科技有限公司 | A kind of MVR novel crystallizations device goes out salt system |
| CN111249894A (en) * | 2018-11-30 | 2020-06-09 | 颜庭秀 | Method for simultaneously desulfurizing and denitrifying flue gas by using solid ammonium salt |
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