CN101612515B - Wet flue gas desulfurization method - Google Patents
Wet flue gas desulfurization method Download PDFInfo
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- CN101612515B CN101612515B CN 200810127471 CN200810127471A CN101612515B CN 101612515 B CN101612515 B CN 101612515B CN 200810127471 CN200810127471 CN 200810127471 CN 200810127471 A CN200810127471 A CN 200810127471A CN 101612515 B CN101612515 B CN 101612515B
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- flue gas
- acid
- absorption
- absorption liquid
- sulphite
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Abstract
The invention discloses a wet flue gas desulfurization method comprising the steps: obtaining absorption liquid with sulphite by using an alkaline absorbing agent which is in contact with flue gas to absorb SO2 in the flue gas in a desulfurizing tower; reacting the obtained absorption liquid containing sulphite with sulphuric acid; transmitting the SO2 precipitated by the reaction to an acid preparation system to prepare the sulphuric acid; and obtaining a solid settling matter of sulphate by soil-liquid collecting reaction. The wet flue gas desulfurization method can use sulphuric acid in waste acid to treat the absorption liquid, shortens a treating process and saves a large amount of device investment and operation cost, and the SO2 absorbed from the flue gas enters the acid preparation system again, therefore, resources can be recycled.
Description
Technical field
The present invention relates to wet flue gas desulfurization method.
Background technology
Present traditional wet method calcium method, sodium method, magnesium method sulfur removal technology, all adopting magnesia, NaOH or aqua calcis (or slurries) is absorbent, in desulfurizing tower with flue gas in SO
2Reaction generates sulphite, and the absorption liquid that then will contain sulphite is sent in the oxidizing tower and carried out oxidation with compressed air, produces sulfate, through sedimentation, filter and carry out Separation of Solid and Liquid, send at last wastewater treatment or discharging.The shortcoming of this method is that the handling process of desulfurization absorption liquid is long, and equipment investment is higher; Need to consume a large amount of compressed air and carry out oxidation, operating cost is high; The SO that from flue gas, absorbs
2Can not be recovered utilization; In the situation that contain not oxidized sulphite in the not high waste water of oxidation efficiency, can produce secondary pollution.
Summary of the invention
The purpose of this invention is to provide a kind of wet flue gas desulfurization method, can shorten the handling process of absorption liquid, reduce equipment investment and operating cost, and the SO in the flue gas
2Can be reused.
The present invention is achieved in that and comprises with alkaline absorbent contact SO in the absorption flue gas with flue gas in desulfurizing tower
2, obtain to contain the absorption liquid of sulphite, it is characterized in that gained is contained absorption liquid and the sulfuric acid reaction of sulphite, the SO that reaction is separated out
2Gas is sent to acid making system and makes sulfuric acid, collects reaction gained solid precipitum sulfate by Separation of Solid and Liquid.
Described absorption liquid directly is sent to acid making system, with the spent acid reaction that acid making system produces, can utilize the equipment such as sedimentation, filtration of acid making system, does not need newly added equipment, and investment reduces.
The present invention processes absorption liquid with the sulfuric acid in the spent acid, does not need oxidation furnaces, and can take full advantage of the equipment such as sedimentation in the acid making system, filtration, has not only shortened handling process, and can save great deal of investment and operating cost.The SO that from flue gas, absorbs
2Enter again acid making system, make resource obtain recycling.For the flow process that the generation spent acid need to be processed, in the process of the sulfuric acid in the spent acid and sulphite reaction, consumed the part spent acid, having reduced needs spent acid amount to be processed, has reduced the spent acid disposal cost.
Description of drawings
Fig. 1 is process chart of the present invention.
The specific embodiment
As shown in Figure 1, in the absorption liquid in the absorption tower 2 is replenished by storage tank 14.Flue gas from pipeline 5 contacts in reverse jet tube 3 with from the circulating absorption solution in the absorption tower 2, the SO in the flue gas
2With the absorption liquid reaction, the sulphite of generation dissolves or is suspended in the absorption liquid, and the flue dust in the flue gas is absorbed the liquid washing, is suspended in the absorption liquid; Flue gas behind the desulfurization and dedusting leads to chimney to tail gas by pipeline 5 and effluxes, and reverse jet tube 3 required purifying waste water are carried by pipeline 4, and pipeline 7 is 2 conveying flushing waters to the absorption tower.Circulating absorption solution part in the absorption tower 2 is sent into the spent acid reaction that concentration is 5-15% sulfuric acid that contains from acid making system of carrying with pipeline 10 in the purification subsider 11 in the acid making system by pipeline 1, the sulphite in the absorption liquid is also separated out SO with sulfuric acid reaction generation sulfate
2Gas, the SO that separates out
2Gas returns sulfate system relieving haperacidity by pipeline 8, and sulfate precipitation thing and flue dust sediment deal with after by filter press 9 press filtrations in addition.Purify the spent acid of discharging in the subsider 11 and the filtrate of filter press 9 and collect 12 by the supernatant liquid bath, its supernatant is pumped to spent acid by pipeline 13 with pump and is processed.
Absorption liquid can be magnesia, NaOH or aqua calcis.
Claims (1)
1. wet flue gas desulfurization method, it is characterized in that, flue gas from pipeline contacts in reverse jet tube with from the circulating absorption solution in the absorption tower, SO2 in the flue gas and absorption liquid reaction, the sulphite that generates dissolves or is suspended in the circulating absorption solution, flue gas behind the desulfurization and dedusting discharges by pipeline, input is purified waste water in the reverse jet tube, in the absorption tower, also carry flushing water, circulating absorption solution part in the absorption tower is sent in the purification subsider in the acid making system and the spent acid reaction that concentration is 5-15% sulfuric acid that contains from acid making system, sulphite in the absorption liquid and sulfuric acid reaction generate sulfate and separate out SO2 gas, the SO2 gas of separating out returns sulfate system relieving haperacidity, sulfate precipitation thing and flue dust sediment deal with after by the filter press press filtration in addition, the spent acid of discharging in the purification subsider and the filtrate of filter press are collected by the supernatant liquid bath, its supernatant is pumped to spent acid by pipeline with pump and is processed, and wherein absorption liquid is magnesium oxide solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810127471 CN101612515B (en) | 2008-06-28 | 2008-06-28 | Wet flue gas desulfurization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810127471 CN101612515B (en) | 2008-06-28 | 2008-06-28 | Wet flue gas desulfurization method |
Publications (2)
| Publication Number | Publication Date |
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| CN101612515A CN101612515A (en) | 2009-12-30 |
| CN101612515B true CN101612515B (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810127471 Active CN101612515B (en) | 2008-06-28 | 2008-06-28 | Wet flue gas desulfurization method |
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| CN (1) | CN101612515B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102580486A (en) * | 2012-02-28 | 2012-07-18 | 浙江南化防腐设备有限公司 | Novel zinc oxide desulfurization method and device |
| CN103041682B (en) * | 2012-10-02 | 2016-05-11 | 云南云天化国际化工股份有限公司 | The application process of a kind of smart desulfurization in sulfuric acid tail is inhaled |
| CN105311942A (en) * | 2014-07-18 | 2016-02-10 | 福建省荔元活性炭实业有限公司 | Active-carbon exhaust-gas cyclic absorption system |
| CN106925089A (en) * | 2017-02-28 | 2017-07-07 | 绍兴文理学院 | A kind of oxygen deprivation method Sulphuric acid comprehensively utilizes united technique with sulfuric acid is reclaimed |
| CN106799127A (en) * | 2017-03-06 | 2017-06-06 | 哈尔滨理工大学 | A kind of waste heat recovery plant of double alkali method desulfurizing system |
| CN107537285B (en) * | 2017-08-25 | 2020-04-07 | 金川集团股份有限公司 | Multi-level recycling system and method for acid-making wastewater from smelting flue gas |
| CN109045975A (en) * | 2018-08-28 | 2018-12-21 | 天津市岩丰精机有限责任公司 | A kind of lepidolite baking flue gas treatment process |
| CN113797734A (en) * | 2021-09-30 | 2021-12-17 | 鲍倩 | Device and method for treating flue gas |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1194176A (en) * | 1997-03-21 | 1998-09-30 | 沈阳环境科学研究所 | New technology for absorbing and eliminating sulfur dioxide in smoke chemically |
| CN1600410A (en) * | 2003-09-24 | 2005-03-30 | 北京国纬达环保科技有限公司 | Integration method for ammonia process of desulfurizing flue gas and multiple utilizing desulfurized products and equipment |
-
2008
- 2008-06-28 CN CN 200810127471 patent/CN101612515B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1194176A (en) * | 1997-03-21 | 1998-09-30 | 沈阳环境科学研究所 | New technology for absorbing and eliminating sulfur dioxide in smoke chemically |
| CN1600410A (en) * | 2003-09-24 | 2005-03-30 | 北京国纬达环保科技有限公司 | Integration method for ammonia process of desulfurizing flue gas and multiple utilizing desulfurized products and equipment |
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| Publication number | Publication date |
|---|---|
| CN101612515A (en) | 2009-12-30 |
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| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Song Xiuming Inventor after: Liang Haiwei Inventor after: Wang Weidong Inventor before: Liang Haiwei Inventor before: Wang Weidong |
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Free format text: CORRECT: INVENTOR; FROM: LIANG HAIWEI WANG WEIDONG TO: SONG XIUMING LIANG HAIWEI WANG WEIDONG |
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