CN1891330A - Method for removing sulfur dioxide from wastegas for making it be a product by circulation of magnesium oxide - Google Patents
Method for removing sulfur dioxide from wastegas for making it be a product by circulation of magnesium oxide Download PDFInfo
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- CN1891330A CN1891330A CN 200510080481 CN200510080481A CN1891330A CN 1891330 A CN1891330 A CN 1891330A CN 200510080481 CN200510080481 CN 200510080481 CN 200510080481 A CN200510080481 A CN 200510080481A CN 1891330 A CN1891330 A CN 1891330A
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Abstract
This invention discloses a method for using MgO in circulation as the desulfurizer to eliminate SO2 in waste gas to become its products, which connects a desulfurizing absorbing tower, a serum preparation tank, a serum separation machine, a byproduct spin-drier, a fluid return tank, a regenerating furnace and a ventilation separator with pipes and pumps, in which, the absorption tower contains a desulfurizing nozzle tube, heat gas is induced from the side of the lower part and flows upward to be mixed inversely with desulrizer serum to lower the temperature and desulfurize then to be expelled from the top, the serum in the lower slurry tank is discharged by the pump to flow to the separator, the MgSO3 solid particles are separated and sent to a regenerating furnace to be heated to 800-1100deg.C to be decomposed to MgO and SO2, which are separated in solid and gas to discharge the MgO to its serum preparation tank as the desulfurizer raw material for further circulation and the recovery is over 90% and SO2 becomes available products.
Description
The technical field is as follows:
the invention relates to a wet flue gas desulfurization method, in particular to a method for removing sulfur dioxide in waste gas by using magnesium oxide, recycling the sulfur dioxide and producing a sulfur dioxide byproduct.
Second, background Art
The sulfur contained in fossil fuels, especially coal and oil, is burned to produce sulfur dioxide gas, which is discharged along with the combustion product waste gas, causing atmospheric pollution. The various flue gas desulfurization processes implemented for treating the pollution of sulfur dioxide in waste gas to atmosphere are all to absorb sulfur dioxide gas in waste gas by a desulfurization absorbent, thereby achieving the purpose of purifying waste gas.
Wet flue gas removal methodThe sulfur process has high desulfurizing efficiency, good adaptability to fume and desulfurizing agent, and wide application, such as calcium-based (adopting calcium oxide CaO, i.e. lime, or calcium carbonate CaCO)3Limestone), but has the defects of easy scaling, abrasion and even blockage, thereby reducing the reliability of operation, and the quality of the produced gypsum byproduct is not high, so that the gypsum byproduct is difficult to effectively utilize. Adopts sodium base (NaOH or Na-carbonate) with good performance2CO3Or sodium bicarbonate NaHCO3) Or magnesium-based (magnesium oxide MgO, or magnesium hydroxide Mg (OH))2) The desulfurizing agent has the disadvantage of high price.
The process of the present invention is significantly superior to the various processes described above. The invention decomposes magnesium oxide desulfurization by-products, regenerates magnesium oxide for recycling, decomposes sulfur dioxide gas with higher concentration into products, can prepare sulfuric acid or other sulfur-containing products, completes resource recycling while treating atmospheric pollution, and realizes economic cycle.
Thirdly, the invention content:
the invention aims to provide a method for desulfurizing flue gas and recovering a desulfurizing agent and simultaneously producing sulfur dioxide, which adopts magnesium oxide with excellent performance as the desulfurizing agent, has the desulfurizing efficiency of up to 99 percent, reliable operation, lower manufacturing cost than other processes with the same performance, and can produce sulfur dioxide gas by regenerating and recycling the desulfurizing agent.
The device mainly comprises a cylindrical desulfurization absorption tower, a slurry preparation tank, a byproduct slurry separator, a byproduct dehydrator, a byproduct regeneration furnace, a regeneration furnace exhaust separator, a liquid return box and other devices, and a related water pump, a fan and a connecting pipeline. The absorption tower is internally provided with a desulfurization nozzle pipe, hot flue gas is introduced from one side of the lower part, flows from bottom to top, is reversely mixed with desulfurization slurry to carry out cooling and desulfurization reaction, and the cooled and purified flue gas is discharged from the top. The slurry of the magnesium sulfite formed by the absorption reaction retains PH value is 5.5-6.5, the slurry is pumped back to the desulfurization nozzle pipe for circular spraying, the slurry in the lower slurry tank is discharged by a pump and flows to a separator, wherein magnesium sulfite (MgSO)3) Solid particles as main components are separated, discharged to a dehydrator for further dehydration and then sent into a regeneration furnace, the regeneration furnace is burnt by fuel and heated to 800-1100 ℃ to decompose magnesium sulfite into magnesium oxide and sulfur dioxide, and the fluegas of the regeneration furnace containing the magnesium oxide solid particles and the sulfur dioxide gas is subjected to solid-gas separation to separate oxygen from gasThe magnesium oxide powder is discharged and collected to be used as a desulfurizer raw material and sent back to the magnesium oxide slurry preparation tank for recycling, the gas containing sulfur dioxide becomes a product after dust removal, sulfuric acid or other sulfur-containing products can be further produced and sold for utilization, and the liquid containing magnesium (Mg) with few solid particles separated from the separator is mixed with the liquid separated from the dehydrator and then is pumped to the desulfurization absorption tower for recycling.
The method has the advantages that:
1. magnesium oxide (MgO) with excellent performance is used as a desulfurizer.
2. The magnesium oxide desulfurizer can be regenerated and recycled from byproducts, and the recovery rate is more than 90%.
3. The harmful component sulfur dioxide polluting the atmosphere in the flue gas is removed from the flue gas and then converted into sulfur dioxide gas with high economic value, and the harmful pollutant is changed into a useful product.
Description of the drawings
The figure is a schematic structural flow chart of a method for removing sulfur dioxide in waste gas into products by recycling magnesium oxide.
Fifth, the implementation method
As shown in the figure, the equipment comprises a cylindrical desulfurization absorption tower (1), a desulfurizer slurry preparation tank (6), a byproduct slurry separator (15), a byproduct dehydrator (17), a liquid return box (20), a regenerator (24) and a regenerator gas separator (28), wherein the upper part of the desulfurization absorption tower (1) is provided with a desulfurization nozzle pipe (3), the lower part of the desulfurization absorption tower is provided with a desulfurization absorption tower slurry pool (9), and the following method is adopted for cyclic operation:
flue gas containing acid gases such as sulfur dioxide, hydrogen chloride, hydrogen fluoride and the like enters a desulfurization absorption tower (1) through an inlet smoke pipe (2), passes from bottom to top, is contacted with slurry sprayed out through a desulfurization nozzle pipe (3) to carry out absorption reaction, the acid gases such as sulfur dioxide and the like in the flue gas are washed and fall into a slurry tank (9) at the lower part, and the flue gas from which the acid gases such as sulfur dioxide and the like are removed is discharged from a clean flue gas discharge pipe (4); the slurry in the slurry tank (9) is pumped into a circulating pipe (11) through a circulating pump (10) and enters a desulfurization nozzle pipe (3) to be sprayed out for repeated circulation; desulfurizer magnesium oxide is added into a slurry preparation tank (6) through a magnesium oxide adding pipe (5) and mixed with water of a water injection pipe (34) to generate slurry, the slurry is pumped into a desulfurizer slurry pipe (8) through a slurry pump (7) and mixed with a recirculation pipe (11), and the slurry is sent into a desulfurization nozzle pipe (3); the slurry in the slurry pool (9) of the desulfurization absorption tower is discharged through a slurry discharge pipe (12), is pumped into a slurry supply pipe (14) through a slurry discharge pump (13), enters a byproduct slurry separator (15), is added with an additive through an additive pipe (35) to improve the separation effect, wherein water and solid byproducts are separated, the water is discharged into a liquid return box (20) through a separator drain pipe (19), the solid byproducts are discharged into a byproduct dehydrator (17) through a slurry discharge pipe (16) to be further dehydrated or completely dried, the dehydrated water is discharged into the liquid return box (20) through a dehydration discharge pipe (18), and is pumped into a liquid return pipe (22) through a liquid return pump (21) to be returned into the slurry pool (9) of the desulfurization absorption tower; dry by-products produced from a by-product dehydrator (17) are fed into a regenerating furnace (24) through a feed pipe (23), fuel fed through a fuel pipe (25) and air fed through an air pipe (26) are combusted in the regenerating furnace, and the by-products fed through the feed pipe (23) are heated to 800-:
the generated magnesium oxide is discharged through a slag discharge pipe (31), the generated gas containing sulfur dioxide carries magnesium oxide powder and is discharged from a regeneration furnace exhaust pipe (27) to a regeneration furnace exhaust separator (28) to separate the magnesium oxide powder, the gas is discharged through a magnesium oxide solid particle discharge pipe (30), the gas is mixed with the magnesium oxide discharged through the slag discharge pipe (31), and the mixture is discharged into a regeneration magnesium oxide conveying pipe (33) through a regeneration magnesium oxide conveyer (32) and is returned to a slurry preparation tank (6), so that the regeneration cycle of the desulfurizer magnesium oxide is realized; the sulfur dioxide gas discharged from the regenerator exhaust separator (28) is sent out through a purified sulfur dioxide gas discharge pipe (29) and becomes a by-product of the flue gas desulfurization apparatus.
The byproduct slurry separator (15) can be a centrifugal separator, a vacuum separatoror a gravity sedimentation tank, the solid content in the slurry discharged from the slurry discharge pipe (16) is 40-70%, and the solid content in the discharged water from the separator drain pipe (19) is 0.5-3%; when a gravity type sedimentation tank (15) is adopted, the additive is added through an additive pipe (35) to accelerate the solid separation speed of the slurry separator (15).
The by-product dehydrator (17) may be a vacuum dehydrator or a heating type drying furnace; the water content of the solid by-product produced by the vacuum by-product dehydrator (17) is 20% or less, the water content of the solid by-product produced by the heating type drying furnace is less than 1%, and the exhaust gas of the heating furnace is discharged to the inlet smoke pipe (2) through the exhaust gas pipe (36); the heating type drying oven may be a fuel-fired drying oven or a drying oven using another heat medium (steam, air, or the like).
The main procedure of the desulfurization reaction is as follows.
Magnesium oxide ripening reaction in a slurry preparation tank
The reaction carried out in the desulfurization absorption tower mainly comprises the following steps:
absorption reaction of sulfur dioxide by water
Magnesium oxide (MgO) desulfurizer is aged by adding water to generate magnesium hydroxide (Mg (OH)2) The slurry undergoes the following desulfurization absorption reaction:
the oxidation reaction is carried out in the presence of oxygen in the flue gas:
under normal reaction conditions, the main desulfurization by-product is MgSO (MgSO) in solid state3And a small amount of MgSO in solution form4. The solid magnesium sulfite is separated from the slurry and further dehydrated and sent to a regenerator where the main decomposition reactions are:
Claims (3)
1. a method for removing sulfur dioxide in waste gas to form products by recycling magnesium oxide, which structurally comprises a desulfurization absorption tower (1), a slurry preparation tank (6), a slurry separator (15), a dehydrator (17), a liquid return box (20), a regenerating furnace (24) and a regenerating furnace exhaust separator (28) which are connected through a pipeline and a pump, and is characterized in that: flue gas containing acid gases such as sulfur dioxide, hydrogen chloride, hydrogen fluoride and the like enters a desulfurization absorption tower (1) through an inlet smoke pipe (2), passes from bottom to top, is contacted with slurry sprayed out through a desulfurization nozzle pipe (3) to carry out absorption reaction, the acid gases such as sulfur dioxide and the like in the flue gas are washed and fall into a slurry tank (9) at the lower part, and the flue gas from which the acid gases such as sulfur dioxide and the like are removed is discharged from a clean flue gas discharge pipe (4); the slurry in the slurry tank (9) is pumped into a circulating pipe (11) through a circulating pump (10) and enters a desulfurization nozzle pipe (3) to be sprayed out for repeated circulation; desulfurizer magnesium oxide is added into a slurry preparation tank (6) through a magnesium oxide adding pipe (5) and mixed with water of a water injection pipe (34) to generate slurry, the slurry is pumped into a desulfurizer slurry pipe (8) through a slurry pump (7) and mixed with a recirculation pipe (11), and the slurry is sent into a desulfurization nozzle pipe (3); the slurry in the slurry pool (9) of the desulfurization absorption tower is discharged through a slurry discharge pipe (12), is pumped into a slurry supply pipe (14) through a slurry discharge pump (13), enters a byproduct slurry separator (15), is added with an additive through an additive pipe (35) to improve the separation effect, wherein water and solid byproducts are separated, the water is discharged into a liquid return box (20) through a separator drain pipe (19), the solid byproducts are discharged into a byproduct dehydrator (17) through a slurry discharge pipe (16) to be further dehydrated or completely dried, the dehydrated water is discharged into the liquid return box (20) through a dehydration discharge pipe (18), and is pumped into a liquid return pipe (22) through a liquid return pump (21) to be returned into the slurry pool (9) of the desulfurization absorption tower; dry by-products produced from a by-product dehydrator (17) are fed into a regenerating furnace (24) through a feed pipe (23), fuel fed through a fuel pipe (25) and air fed through an air pipe (26) are combusted in the regenerating furnace, and the by-products fed through the feed pipe (23) are heated to 800-:
the generated magnesium oxide is discharged through a slag discharge pipe (31), the generated gas containing sulfurdioxide carries magnesium oxide powder and is discharged from a regeneration furnace exhaust pipe (27) to a regeneration furnace exhaust separator (28) to separate the magnesium oxide powder, the gas is discharged through a magnesium oxide solid particle discharge pipe (30), the gas is mixed with the magnesium oxide discharged through the slag discharge pipe (31), and the mixture is discharged into a regeneration magnesium oxide conveying pipe (33) through a regeneration magnesium oxide conveyer (32) and is returned to a slurry preparation tank (6), so that the regeneration cycle of the desulfurizer magnesium oxide is realized; the sulfur dioxide gas discharged from the regenerator exhaust separator (28) is sent out through a purified sulfur dioxide gas discharge pipe (29) and becomes a by-product of the flue gas desulfurization apparatus.
2. The method for recycling magnesium oxide to remove sulfur dioxide from flue gas to make it a product as claimed in claim 1, wherein: the byproduct slurry separator (15) can be a centrifugal separator, a vacuum separator or a gravity sedimentation tank, the solid content in the slurry discharged from the slurry discharge pipe (16) is 40-70%, and the solid content in the discharged water from the separator drain pipe (19) is 0.5-3%; when a gravity type sedimentation tank (15) is adopted, the additive is added through an additive pipe (35) to accelerate the solid separation speed of the slurry separator (15).
3. The method for recycling magnesium oxide to remove sulfur dioxide from flue gas into product as claimed in claim 1, further characterized by: the by-product dehydrator (17) may be a vacuum dehydrator or a heating type drying furnace; the water content of the solid by-product produced by the vacuum by-product dehydrator (17) is 20% or less, the water content of the solid by-product produced by the heating type drying furnace is less than 1%, and the exhaust gas of the heating furnace is discharged to the inlet smoke pipe (2) through the exhaust gas pipe (36); the heating type drying oven may be a fuel-fired drying oven or a drying oven using another heat medium (steam, air, or the like).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100804812A CN100560184C (en) | 2005-07-05 | 2005-07-05 | Recycle magnesia and remove that sulfur dioxide makes it become the method for product in the waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100804812A CN100560184C (en) | 2005-07-05 | 2005-07-05 | Recycle magnesia and remove that sulfur dioxide makes it become the method for product in the waste gas |
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| Publication Number | Publication Date |
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| CN1891330A true CN1891330A (en) | 2007-01-10 |
| CN100560184C CN100560184C (en) | 2009-11-18 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101947406A (en) * | 2010-07-22 | 2011-01-19 | 山西晋丰环保工程设计有限公司 | Energy-saving and consumption-reducing magnesium oxide flue gas desulfurization process and device |
| CN102101004A (en) * | 2011-01-26 | 2011-06-22 | 中节能六合天融环保科技有限公司 | Method for recovering magnesium oxide and byproduct sulfur dioxide by using indirect heating rotary roasting furnace |
| CN103111187A (en) * | 2013-02-06 | 2013-05-22 | 盛尼克能源环保技术(重庆)有限公司 | System and method for regenerating magnesium oxides and sulfur dioxides through decomposition of magnesium oxide desulphurization by-products |
| CN103480265A (en) * | 2013-09-16 | 2014-01-01 | 青岛渤海和合工程技术有限公司 | Method for recovering by-products while using magnesium oxide for controlling SO2 waste gas |
| CN106310942A (en) * | 2016-10-31 | 2017-01-11 | 许仁忠 | Treating device for engine exhaust emission of vehicle or mechanical engineering |
| CN110090550A (en) * | 2019-04-17 | 2019-08-06 | 昆明理工大学 | A kind of coke oven flue gas sulfur method thermally decomposed in advance based on magnesium salts |
| CN110980779A (en) * | 2019-12-17 | 2020-04-10 | 江苏联慧资源环境科技有限公司 | Recovery method of magnesium oxide desulfurizer |
| CN111729474A (en) * | 2020-06-10 | 2020-10-02 | 上海交通大学 | Method for circulating flue gas desulfurization and sulfur dioxide recovery by using organic acid magnesium solution |
| CN113440993A (en) * | 2020-03-24 | 2021-09-28 | 中国科学院过程工程研究所 | Purification system and purification method for organic silicon acid-containing waste gas |
Families Citing this family (1)
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1220545C (en) * | 2002-10-22 | 2005-09-28 | 熊天渝 | Washing system for adding magnesia lime/lime rock for removing SO2 and producing gypsum simultaneously |
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2005
- 2005-07-05 CN CNB2005100804812A patent/CN100560184C/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101947406A (en) * | 2010-07-22 | 2011-01-19 | 山西晋丰环保工程设计有限公司 | Energy-saving and consumption-reducing magnesium oxide flue gas desulfurization process and device |
| CN102101004A (en) * | 2011-01-26 | 2011-06-22 | 中节能六合天融环保科技有限公司 | Method for recovering magnesium oxide and byproduct sulfur dioxide by using indirect heating rotary roasting furnace |
| CN103111187A (en) * | 2013-02-06 | 2013-05-22 | 盛尼克能源环保技术(重庆)有限公司 | System and method for regenerating magnesium oxides and sulfur dioxides through decomposition of magnesium oxide desulphurization by-products |
| CN103111187B (en) * | 2013-02-06 | 2015-02-04 | 盛尼克能源环保技术(重庆)有限公司 | System and method for regenerating magnesium oxides and sulfur dioxides through decomposition of magnesium oxide desulphurization by-products |
| CN103480265A (en) * | 2013-09-16 | 2014-01-01 | 青岛渤海和合工程技术有限公司 | Method for recovering by-products while using magnesium oxide for controlling SO2 waste gas |
| CN103480265B (en) * | 2013-09-16 | 2016-04-06 | 青岛和合汇途工程技术有限公司 | One utilizes magnesia to administer SO 2waste gas reclaims the method for byproduct simultaneously |
| CN106310942A (en) * | 2016-10-31 | 2017-01-11 | 许仁忠 | Treating device for engine exhaust emission of vehicle or mechanical engineering |
| CN110090550A (en) * | 2019-04-17 | 2019-08-06 | 昆明理工大学 | A kind of coke oven flue gas sulfur method thermally decomposed in advance based on magnesium salts |
| CN110980779A (en) * | 2019-12-17 | 2020-04-10 | 江苏联慧资源环境科技有限公司 | Recovery method of magnesium oxide desulfurizer |
| CN113440993A (en) * | 2020-03-24 | 2021-09-28 | 中国科学院过程工程研究所 | Purification system and purification method for organic silicon acid-containing waste gas |
| CN111729474A (en) * | 2020-06-10 | 2020-10-02 | 上海交通大学 | Method for circulating flue gas desulfurization and sulfur dioxide recovery by using organic acid magnesium solution |
| CN111729474B (en) * | 2020-06-10 | 2021-08-31 | 上海交通大学 | Method for circulating flue gas desulfurization and sulfur dioxide recovery by using organic acid magnesium solution |
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| Publication number | Publication date |
|---|---|
| CN100560184C (en) | 2009-11-18 |
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Application publication date: 20070110 Assignee: Sunic Energy & Environment Technologies (Chongqing) Co., Ltd. Assignor: Xiong Tianyu Contract record no.: 2012990000512 Denomination of invention: Method for removing sulfur dioxide from wastegas for making it be a product by circulation of magnesium oxide Granted publication date: 20091118 License type: Exclusive License Record date: 20120719 |
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Address after: 400039 Chongqing Jiulongpo Shiqiaopu City Yuzhou Road No. 4 No. 16 elite international 32 Patentee after: Xiong Tianyu Address before: 100089 Beijing Haidian District Zizhuyuan Road No. 88 A block 207 Patentee before: Xiong Tianyu |