CN100560184C - Recycle magnesia and remove that sulfur dioxide makes it become the method for product in the waste gas - Google Patents
Recycle magnesia and remove that sulfur dioxide makes it become the method for product in the waste gas Download PDFInfo
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- CN100560184C CN100560184C CNB2005100804812A CN200510080481A CN100560184C CN 100560184 C CN100560184 C CN 100560184C CN B2005100804812 A CNB2005100804812 A CN B2005100804812A CN 200510080481 A CN200510080481 A CN 200510080481A CN 100560184 C CN100560184 C CN 100560184C
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Abstract
The invention discloses a kind of magnesia that recycles is that desulfurizing agent is removed the method that sulfur dioxide in the waste gas becomes the sulfur dioxide product, equipment such as desulfuration absorbing tower, slurry preparation jar, pulp-liquor separator, byproduct dewaterer, liquid-return box, regenerating furnace, exhaust seperator is connected with pump with pipeline.The desulfurization nozzle pipe is housed in the absorption tower, hot flue gas from the bottom one side introduce, upwards flow, with desulfurizer slurry reverse mix lower the temperature and desulphurization reaction after discharge from the top, the slurries of bottom stock tank by the pump discharge currents to seperator, magnesium sulfite (MgSO wherein
3) solid grain is separated to send into and is heated to 800-1100 ℃ in the regenerating furnace, make it resolve into magnesia and sulfur dioxide, send the magnesia powder discharge back to magnesia slurry preparation jar as the desulfurizing agent raw material and recycle through solid, gas separation, the rate of recovery reaches more than 90%, and sulfur dioxide becomes useful products by noxious pollutant, pollutes in improvement and realizes resource recycling simultaneously.
Description
One, technical field:
The present invention relates to a kind of wet flue gas desulfurization method, particularly relate to and a kind ofly remove in the waste gas sulfur dioxide and can recycle use, the method for producing the sulfur dioxide byproduct simultaneously with magnesia.
Two, background technology
The sulphur that contains in fossil fuel, particularly coal and the oil produces sulfur dioxide gas after burning, discharge with combustion products of exhaust gas, causes atmosphere pollution.For administering the various flue gas desulfurization techniques that sulfur dioxide is implemented the pollution of atmosphere in the waste gas all is to absorb sulfur dioxide gas in the waste gas with desulfurization absorbent, reaches the purpose of purifying exhaust air.
Wet fuel gas desulfurizing technology has the desulfuration efficiency height, and is good to the adaptability of flue gas and desulfurizing agent, also can be suitable for jumbo gas cleaning etc., so most widely used, (adopt calcium oxide CaO, i.e. lime, or calcium carbonate CaCO as the calcium base
3, i.e. lime stone) and sulfur removal technology etc., but its defective is to be easy to fouling, wearing and tearing even stop up, thus reduced reliability of operation, and the gypsum by-product that produces is of low quality, is difficult to effective utilization.Adopt good sodium base (the NaOH NaOH, or sodium carbonate Na of performance
2CO
3, or sodium acid carbonate NaHCO
3) or magnesium base (magnesia MgO, or magnesium hydroxide Mg (OH)
2) desulfurizing agent has the expensive deficiency of price.
Method of the present invention obviously is better than existing above-mentioned the whole bag of tricks.Formerly technology all is to be purpose with the sulfur dioxide removed in the waste gas, desulfurizing agent also consumes when removing sulfur dioxide, the inventive method is then decomposed the magnesia desulfuration byproduct, regenerating oxidation magnesium recycles, and the sulfur dioxide gas that decomposites higher concentration becomes product, can make sulfuric acid, perhaps produces other sulfur-bearing product, finish resource recycling simultaneously in control atmosphere pollution, realize economic circulation.
Three, summary of the invention:
The purpose of this invention is to provide a kind of like this flue gas desulfurization and reclaim the method that desulfurizing agent is produced sulfur dioxide simultaneously, it adopts the magnesia of function admirable is desulfurizing agent, desulfuration efficiency is up to 99%, reliable, cost is lower than other technology with performance, and the desulfurizing agent recycling utilization, can also produce sulfur dioxide gas.
This invention mainly comprises drum shape desulfuration absorbing tower, slurry preparation jar, byproduct pulp-liquor separator, byproduct dewaterer, byproduct regenerating furnace, regenerating furnace exhaust seperator, equipment such as liquid-return box and relevant water pump, blower fan and connecting line.The desulfurization nozzle pipe is housed in the described absorption tower, and hot flue gas is the introducing of one side from the bottom, flows from the bottom up, lowers the temperature and desulphurization reaction with reverse mixing of desulfurization slurry, discharges at the top through the flue gas of cooling and purification.The sulfurous acid magnesium salts slurries that absorption reaction forms keep pH value at 5.5-6.5, through pumped back desulfurization nozzle pipe, carry out circulated sprinkling, and the slurries of bottom stock tank are discharged by pump, flow to seperator, and its Shen is with magnesium sulfite (MgSO
3) be separated for the solid grain of Main Ingredients and Appearance, be discharged into and be admitted in the regenerating furnace after dewaterer is further dehydrated, regenerating furnace is heated to 800-1100 ℃ by fuel combustion makes magnesium sulfite resolve into magnesia and sulfur dioxide, the regenerating furnace flue gas that contains solid grain of magnesia and sulfur dioxide gas is through solid, gas separates magnesia powder discharged and is used as the desulfurizing agent raw material under collecting and sends magnesia slurry preparation jar back to and recycle, the gas that contains sulfur dioxide then becomes product and can further produce sulfuric acid or other sulfur-bearing product after removing dust, sell to utilize, in seperator, separate contain the solid grain liquid that contains magnesium (Mg) composition seldom and the liquid of being separated by dewaterer mix after be pumped to the desulfuration absorbing tower recycling.
The advantage of the inventive method is:
1. adopting the magnesia (MgO) of function admirable is desulfurizing agent.
2. the magnesia desulfurizing agent recovery of can regenerating from byproduct recycles, and the rate of recovery is greater than 90%.
3. atmosphere pollution oxious component sulfur dioxide is changed into the sulfur dioxide gas of high economic worth in the flue gas after removing from flue gas, and the change noxious pollutant is useful products.
Four, description of drawings
Figure is a kind of structure schematic flow sheet of the present invention's " recycle magnesia remove sulfur dioxide makes it become the method for product in the waste gas ".
Five, implementation method
As shown in the figure, described equipment comprise the preparation of drum shape desulfuration absorbing tower (1), desulfurizer slurry jar (6), a byproduct pulp-liquor separator (15), byproduct dewaterer (17), liquid-return box (20, regenerating furnace (24) and the furnace gas seperator (28) of regenerating, the top of described desulfuration absorbing tower (1) is provided with desulfurization nozzle pipe (3), the bottom is desulfuration absorbing tower stock tank (9), and adopts following method cycling:
Contain sulfur dioxide, hydrogen chloride, the flue gas of sour gas such as hydrogen fluoride enters desulfuration absorbing tower (1) by inlet smoke pipe (2), from following, up pass through, through slurries contact the carrying out absorption reaction of desulfurization nozzle pipe (3) ejection, the washing of sour gas such as sulfur dioxide in flue gas is fallen into the stock tank (9) of bottom, slough the flue gas of sour gas such as sulfur dioxide and discharge from clean smoke discharge pipe (4); Slurries in stock tank (9) pump into circulation pipe (11) through circulating pump (10), enter desulfurization nozzle pipe (3) ejection, repeatedly circulation; Desulfurizing agent magnesia adds pipe (5) through magnesia and adds slurry preparation jars (6) and mixes with the water of water injection pipe (34) and produce slurries and pump into desulfurizing agent through slush pump (7) and starch and manage (8), mixes with recirculation pipe (11), and slurries are sent into desulfurization nozzle pipe (3); The slurries of desulfuration absorbing tower stock tank (9) are discharged through discharge pipe (12), pump into flow inlet (14) through slurry pump (13), enter byproduct pulp-liquor separator (15), add the additive improved separating effect through additive pipe (35), water wherein and solid-state byproduct are separated, water enters liquid-return box (20) through seperator drainpipe (19), solid-state byproduct enters byproduct dewaterer (17) through slurries discharge pipe (16) and is further dehydrated or bone dry, the water of deviating from enters liquid-return box (20) through dehydration discharge pipe (18), pumps into liquid back pipe (22) through time liquid pump (21) and sends desulfuration absorbing tower stock tank (9) back to; Be admitted to regenerating furnace (24) from the dry state byproduct of byproduct dewaterer (17) output through feeder sleeve (23), fuel of sending into through cartridge (25) and the air of sending into through air hose (26) burn in regenerating furnace, to be heated to 800-1100 ℃ through the byproduct that feeder sleeve (23) are sent into, mainly carry out following decomposition reaction:
MgSO
3→MgO+SO
2
The magnesia that produces is discharged through slag discharge pipe (31), the sulfur dioxide gas that contains that produces carries magnesia powder and drains into regenerating furnace exhaust seperator (28) by regenerating furnace blast pipe (27) magnesia powder is separated, discharge through magnesia solid grain discharge pipe (30), mixes after regenerating oxidation magnesium conveyer (32) enters regenerating oxidation magnesium carrier pipe (33) with the magnesia of discharging and to send slurry preparation jar (6) back to, the magnesian regeneration cycle of realization desulfurizing agent through slag discharge pipe (31); Send and be cleaned sulfur dioxide gas discharge pipe (29), become the byproduct of flue gas desulfur device for this reason through the sulfur dioxide gas that regenerating furnace exhaust seperator (28) is discharged.
Byproduct pulp-liquor separator (15) can be a centrifugal separator, or vacuum type seperator, or the gravity type sedimentation basin, the solid composition is 40-70% in the slurries that slurries discharge pipe (16) is discharged, the solid composition in seperator drainpipe (19) draining is 0.5-3%; When adopting gravity type sedimentation basin (15), add the separating rate that additive is accelerated pulp-liquor separator (15) solid through additive pipe (35).
Byproduct dewaterer (17) can be the vacuum type dewaterer, or fire kiln; The moisture content of the solid by-product that is produced by vacuum type byproduct dewaterer (17) is below 20%, and the moisture content of the solid by-product that is produced by fire kiln is less than 1%, and the waste gas of heating furnace is discharged into inlet smoke pipe (2) through flue gas leading (36); Fire kiln can also be the drying oven of combustion fuel, or with the drying oven of other thermal medium (steam, air etc.).
The main program of desulphurization reaction is as follows.
The magnesia slaking reaction that in the slurry preparation jar, carries out
MgO+H
2O→Mg(OH)
2
The reaction of carrying out in desulfuration absorbing tower mainly comprises:
Sulfur dioxide is by the water absorption reaction
SO
2+H
2O→H
2SO
3
Magnesia (MgO) desulfurizing agent generates magnesium hydroxide (Mg (OH) through adding water cure
2) slurries carry out following desulfurization absorption reaction:
Mg(OH)
2+H
2SO
3→MgSO
3+2H
2O
H
2SO
3+2MgSO
3→2Mg(HSO
3)
2
Mg(HSO
3)
2+Mg(OH)
2→2MgSO
3+2H
2O
Carry out oxidation reaction when in flue gas, having oxygen:
Mg(HSO
3)
2+1/2O
2→MgSO
4+H
2SO
3
MgSO
3+1/2O
2→MgSO
4
Under common reaction condition, main desulfurizing byproduct is solid-state MgSO
3And the MgSO of a spot of solution shape
4Solid-state sulfurous acid magnesium salts is separated from slurries, and further is sent to regenerating furnace after the dehydration, and the main decomposition reaction in regenerating furnace is:
MgSO
3→MgO+SO
2↑
Claims (8)
1. one kind recycles magnesia and removes that sulfur dioxide makes it become the method for product in the waste gas, its structural system comprises desulfuration absorbing tower (1), slurry preparation jar (6), oar liquid separator (15), dewaterer (17), liquid-return box (20), regenerating furnace (24) is connected with pump with pipeline with regenerating furnace exhaust seperator (28), it is characterized in that: contain sulfur dioxide, hydrogen chloride, the flue gas of sour gas such as hydrogen fluoride enters desulfuration absorbing tower (1) by inlet smoke pipe (2), from following, up pass through, slurries contact carrying out absorption reaction through desulfurization nozzle pipe (3) ejection, sour gas such as sulfur dioxide in flue gas washings is fallen into the stock tank (9) of bottom, slough the flue gas of sour gas such as sulfur dioxide and discharge from clean smoke discharge pipe (4); Slurries in stock tank (9) pump into circulation pipe (11) through circulating pump (10), enter desulfurization nozzle pipe (3) ejection, repeatedly circulation; Desulfurizing agent magnesia adds pipe (5) through magnesia and adds slurry preparation jars (6) and mixes with the water of water injection pipe (34) and produce slurries and pump into desulfurizing agent through slush pump (7) and starch and manage (8), mixes with recirculation pipe (11), and slurries are sent into desulfurization nozzle pipe (3); The slurries of desulfuration absorbing tower stock tank (9) are discharged through discharge pipe (12), pump into flow inlet (14) through slurry pump (13), enter byproduct pulp-liquor separator (15), add the additive improved separating effect through additive pipe (35), water wherein and solid-state byproduct are separated, water enters liquid-return box (20) through seperator drainpipe (19), solid-state byproduct enters byproduct dewaterer (17) through slurries discharge pipe (16) and is further dehydrated or bone dry, the water of deviating from enters liquid-return box (20) through dehydration discharge pipe (18), pumps into liquid back pipe (22) through time liquid pump (21) and sends desulfuration absorbing tower stock tank (9) back to; Be admitted to regenerating furnace (24) from the dry state byproduct of byproduct dewaterer (17) output through feeder sleeve (23), fuel of sending into through cartridge (25) and the air of sending into through air hose (26) burn in regenerating furnace, to be heated to 800-1100 ℃ through the byproduct that feeder sleeve (23) are sent into, mainly carry out following decomposition reaction:
MgSO
3→MgO+SO
2
The magnesia that produces is discharged through slag discharge pipe (31), the sulfur dioxide gas that contains that produces carries magnesia powder and drains into regenerating furnace exhaust seperator (28) by regenerating furnace blast pipe (27) magnesia powder is separated, discharge through magnesia solid grain discharge pipe (30), mixes after regenerating oxidation magnesium conveyer (32) enters regenerating oxidation magnesium carrier pipe (33) with the magnesia of discharging and to send slurry preparation jar (6) back to, the magnesian regeneration cycle of realization desulfurizing agent through slag discharge pipe (31); Send and be cleaned sulfur dioxide gas discharge pipe (29), become the byproduct of flue gas desulfur device for this reason through the sulfur dioxide gas that regenerating furnace exhaust seperator (28) is discharged.
2. recycle magnesia according to claim 1 and remove that sulfur dioxide makes it become the method for product in the waste gas, it is characterized in that: byproduct pulp-liquor separator (15) can be a centrifugal separator, or vacuum type seperator, or gravity type sedimentation basin, the solid composition is 40-70% in the slurries that slurries discharge pipe (16) is discharged, and the solid composition in seperator drainpipe (19) draining is 0.5-3%.
3. remove as recycling magnesia as described in the claim 2 that sulfur dioxide makes it become the method for product in the waste gas, it is characterized in that: when byproduct pulp-liquor separator (15) adopts the gravity type sedimentation basin, add the separating rate that additive is accelerated byproduct pulp-liquor separator (15) solid through additive pipe (35).
4. recycle magnesia according to claim 1 and remove that sulfur dioxide makes its method that becomes product in the waste gas, method is characterized in that: byproduct dewaterer (17) can be the vacuum type dewaterer, or fire kiln.
5, remove as recycling magnesia as described in the claim 4 that sulfur dioxide makes it become the method for product in the waste gas, it is characterized in that: the moisture content of the solid by-product that is produced by vacuum type byproduct dewaterer (17) is below 20%.
6, remove as recycling magnesia as described in the claim 4 that sulfur dioxide makes it become the method for product in the waste gas, it is characterized in that: the moisture content of the solid by-product that is produced by fire kiln is less than 1%, and the waste gas of fire kiln is discharged into inlet smoke pipe (2) through flue gas leading (36).
7, remove as recycling magnesia as described in the claim 4 that sulfur dioxide makes it become the method for product in the waste gas, it is characterized in that: fire kiln can be the drying oven of combustion fuel.
8, remove as recycling magnesia as described in the claim 4 that sulfur dioxide makes it become the method for product in the waste gas, it is characterized in that: described drying oven is with steam or the air drying oven as thermal medium.
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|---|---|---|---|
| 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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|---|---|---|---|
| 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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| CN100560184C true CN100560184C (en) | 2009-11-18 |
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Cited By (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 |
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|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| CN113440993B (en) * | 2020-03-24 | 2022-10-28 | 中国科学院过程工程研究所 | Purification system and purification method for organic silicon acid-containing waste gas |
| 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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1491738A (en) * | 2002-10-22 | 2004-04-28 | 熊天渝 | Washing system for adding magnesia lime/lime rock for removing SO2 and producing gypsum simultaneously |
-
2005
- 2005-07-05 CN CNB2005100804812A patent/CN100560184C/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1491738A (en) * | 2002-10-22 | 2004-04-28 | 熊天渝 | Washing system for adding magnesia lime/lime rock for removing SO2 and producing gypsum simultaneously |
Cited By (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 |
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|---|---|
| CN1891330A (en) | 2007-01-10 |
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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 |