CN102000494A - Method for desulfurizing sintering machine flue gas by magnesium strengthened line-gypsum - Google Patents
Method for desulfurizing sintering machine flue gas by magnesium strengthened line-gypsum Download PDFInfo
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- CN102000494A CN102000494A CN 201010593336 CN201010593336A CN102000494A CN 102000494 A CN102000494 A CN 102000494A CN 201010593336 CN201010593336 CN 201010593336 CN 201010593336 A CN201010593336 A CN 201010593336A CN 102000494 A CN102000494 A CN 102000494A
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Abstract
The invention discloses a method for desulfurizing sintering machine flue gas by magnesium strengthened line-gypsum, comprising the following steps of: purifying the sintering machine flue gas by an electric precipitator and importing the sintering machine flue gas into an absorption tower by a draught fan; causing the flue gas to make reverse convection contact with the atomized desulfurization liquid sprayed by a nozzle in the tower to form a favorable atomized absorption area and complete the desulfurization absorption of the flue gas; demisting the desulfurized flue gas by a demister at the top of the tower and then directly discharging the flue gas from a chimney at the top of the tower; and prolonging the contact time between the flue gas and the slurry by adopting secondary impact technology in the absorption tower so as to improve the desulfurization rate. Lime slurry and MgO slurry are mixed in the desulfurization liquid, and MgO occupies 1-3% of the weight of the lime slurry; and the absorption tower is internally provided with a tower kettle agitator. In the invention, 1-3% of lime slurry is replaced by magnesium hydroxide solution, and the magnesium salt has stronger dissolubility to ensure that the alkalinity of the solution is 10-15 times higher than calcium-based technology; therefore, the desulfurization rate is as high as 95% when the gas-liquid interface is relatively faster in equivalent gas to liquid ratio.
Description
Technical field
The present invention relates to a kind of magnesium fortified lime-gypsum method flue gas of sintering machine method that adds.
Background technology
There are following characteristics in sintering device flue gas:
1, flue gas SO
2Change in concentration is big, at 400～4000mg/m
3More than.
2, flue-gas temperature changes greatly, can be from 80 ℃ to 180 ℃.
3, flue gas flow changes greatly, up to more than 40%.
4, flue gas moisture content is big, between 10～13%, and unstable.
5, flue gas oxygen content height is between 15～18%.
6, flue gas contains multiple pollution composition, except that containing sulfur dioxide, dust, also contains
Heavy metal, dioxin, nitrogen oxide etc.
Domestic flue gas of sintering machine method commonly used mainly contains: lime-gypsum method, limestone-gypsum method, ammonia process, recirculating fluidized bed method, absorbent charcoal method or the like.The two kinds of methods in front are commonly referred to as the calcium method.The recirculating fluidized bed method is a semidry method.
In engineering practice, when the calcium method was applied to the sintering machine desulfuration engineering, owing to reasons such as design, operational management are not tight, fluctuation of operating conditions, often causing influenced system stable operation and desulfuration efficiency by technological problemses such as fouling, obstruction.
Summary of the invention
The technical issues that need to address of the present invention just are to overcome the defective of prior art, a kind of magnesium fortified lime-gypsum method flue gas of sintering machine method that adds is provided, it adopts magnesium hydroxide solution to substitute 1～3% lime slurry, because the dissolubility of magnesium salts is stronger, the alkalescence that makes solution is than the high 10-15 of calcium base technology times.Therefore very fast relatively at gas-liquid interface, under equal liquid-gas ratio condition, desulfurization degree is up to 95%.
For addressing the above problem, the present invention adopts following technical scheme:
The invention provides a kind of magnesium fortified lime-gypsum method flue gas of sintering machine method that adds, described method comprises the following steps:
Sintering device flue gas is introduced the absorption tower by air-introduced machine after electric cleaner purifies; Flue gas contacts with the reverse convection current of atomizing doctor solution of nozzle ejection at Ta Nei, forms good atomizing uptake zone, and the desulfurization of finishing flue gas absorbs; Through the flue gas after the desulfurization by after the demister demist of cat head directly from the cat head smoke stack emission; Adopt the secondary pulse technology in the absorption tower, the time of contact of prolong smoke and slurries, improve desulfuration efficiency.
Combined lime slurries and MgO slurries in the described doctor solution, the MgO slurries account for 1～3% of lime slurry weight, are provided with tower still mixer in the absorption tower.
Absorb SO
2Doctor solution be delivered to oxidation pond through piping and be oxidized to gypsum, flow into the sedimentation basin precipitation by pipeline again, the gypsum slurries of post precipitation is grabbed out by the driving grab bucket, dries the back outward transport, clear liquid is returned desulfurizing tower by the slag stock pump, and is recycling.
, after flue gas enters the absorption tower, form between flue gas and the doctor solution and impact for the first time below the spraying layer and be mounted with the secondary pulse device between the gas approach on the absorption tower, it is poor to form dynamic pressure, flue gas flow rate is slack-off, and the time of contact of doctor solution and flue gas is elongated, and it is abundant that mass transport process is carried out.
Desulfurization principle of the present invention is as follows:
MgO+H
2O→Mg(OH)
2
Mg(OH)
2+SO
2+H
2O→MgSO
3+2H
2O
MgSO
3+SO
2+H
2O→Mg(HSO
3)
2
MgSO
3+1/2O
2→MgSO
4
MgO combines with water and generates magnesium hydroxide, is the alkalescence reaction, and the present invention adopts magnesium hydroxide solution to substitute 1～3% lime slurry, because the dissolubility of magnesium salts is stronger, the alkalescence that makes solution is than the high 10-15 of calcium base technology times.Therefore very fast relatively at gas-liquid interface, under equal liquid-gas ratio condition, desulfurization degree is up to 95%.
Characteristics of the present invention have:
1) add magnesium ion in doctor solution, itself has very big benefit to the lime desulfurization method.The adding of magnesium ion has generated the big MgCO of solubility
3, increased the activity of sulfite ion, reduced calcium ion concentration, system is moved under the unsaturation state, prevent to stop up, fouling.
2) desulfuration efficiency can be up to more than 96%.
3) sorbent utilization height, calcium/sulphur is 1.015-1.03 than only
4) liquid/gas is than about 1/3 of the lime method that only is equivalent to reach identical desulfuration efficiency.
5) the gypsum by-product quality height (CaSO42H2O＞90%) of Sheng Chaning contains wet part moderate (about 10%), can directly enter gypsum board production line.
The specific embodiment
Sintering device flue gas is introduced the absorption tower by air-introduced machine after electric cleaner purifies.Flue gas contacts with the reverse convection current of atomizing doctor solution of nozzle ejection at Ta Nei, forms good atomizing uptake zone, and the desulfurization of finishing flue gas absorbs.Flue gas after desulfurization is by the demister of cat head, after the demist directly from the cat head smoke stack emission.
Adopt the secondary pulse technology in the absorption tower, the time of contact of prolong smoke and slurries, improve desulfuration efficiency., after flue gas enters the absorption tower, form between flue gas and the doctor solution and impact for the first time below the spraying layer and be mounted with the secondary pulse device between the gas approach on the absorption tower, it is poor to form dynamic pressure, flue gas flow rate is slack-off, and the time of contact of desulfurization slurry and flue gas is elongated, and it is abundant that mass transport process is carried out.
With closed tank truck lime is transported in the factory, carries (air compressor machine) to be transported in the lime storage tank standby by strength.Pulverized limestone is transported to the water circulating pump import by the lime white liquid pump after digesting through digester, enters the absorption tower and carries out desulfurization.Simultaneously, closed tank truck is transported to MgO in the factory, carries (air compressor machine) to be transported in the MgO storage tank standby by strength.The MgO powder is transported to the water circulating pump import by measuring pump according to 1～3% of lime white liquid measure after digesting through digester, mixes with lime slurry, enters the absorption tower and carries out desulfurization.
Water circulating pump is extracted doctor solution out in the tower still, and combined lime slurries and MgO slurries are got to and carried out desulphurization reaction in the tower simultaneously.After absorbing sulfur dioxide, flow back to absorption Tata still, be provided with tower still mixer in the tower still.
Simultaneously, absorb SO
2Doctor solution be delivered to oxidation pond through piping and be oxidized to gypsum, flow into the sedimentation basin precipitation by pipeline again, the gypsum slurries of post precipitation is grabbed out by the driving grab bucket, dries the back outward transport.Clear liquid is returned desulfurizing tower by the slag stock pump, and is recycling.
It should be noted that at last: obviously, the foregoing description only is for example of the present invention clearly is described, and is not the qualification to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being amplified out thus or change still are among protection scope of the present invention.
Claims (4)
1. one kind adds magnesium fortified lime-gypsum method flue gas of sintering machine method, and it is characterized in that: described method comprises the following steps:
Sintering device flue gas is introduced the absorption tower by air-introduced machine after electric cleaner purifies; Flue gas contacts with the reverse convection current of atomizing doctor solution of nozzle ejection at Ta Nei, forms good atomizing uptake zone, and the desulfurization of finishing flue gas absorbs; Through the flue gas after the desulfurization by after the demister demist of cat head directly from the cat head smoke stack emission; Adopt the secondary pulse technology in the absorption tower, the time of contact of prolong smoke and slurries, improve desulfuration efficiency.
2. as claimed in claim 1ly add magnesium fortified lime-gypsum method flue gas of sintering machine method, it is characterized in that: combined lime slurries and MgO slurries in the described doctor solution, the MgO slurries account for 1～3% of lime slurry weight, are provided with tower still mixer in the absorption tower.
3. as claimed in claim 2ly add magnesium fortified lime-gypsum method flue gas of sintering machine method, it is characterized in that: absorb SO
2Doctor solution be delivered to oxidation pond through piping and be oxidized to gypsum, flow into the sedimentation basin precipitation by pipeline again, the gypsum slurries of post precipitation is grabbed out by the driving grab bucket, dries the back outward transport, clear liquid is returned desulfurizing tower by the slag stock pump, and is recycling.
4. add magnesium fortified lime-gypsum method flue gas of sintering machine method as claim 1-3 arbitrary described, it is characterized in that: on the absorption tower for the first time below the spraying layer and be mounted with the secondary pulse device between the gas approach, after flue gas enters the absorption tower, form between flue gas and the doctor solution and impact, it is poor to form dynamic pressure, flue gas flow rate is slack-off, and the time of contact of doctor solution and flue gas is elongated, and it is abundant that mass transport process is carried out.
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| CN 201010593336 CN102000494A (en) | 2010-12-17 | 2010-12-17 | Method for desulfurizing sintering machine flue gas by magnesium strengthened line-gypsum |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103801177A (en) * | 2014-01-27 | 2014-05-21 | 浙江大学 | Flue gas treatment method for simultaneous desulfurization, denitrification and demercuration by calcium and magnesium method |
| CN106334442A (en) * | 2016-11-11 | 2017-01-18 | 焦作和信冶金科技有限责任公司 | Liquid-phase desulphurization device and method for electrolytic aluminum flue gas |
| CN111013345A (en) * | 2019-12-05 | 2020-04-17 | 盛尼克能源环保技术(重庆)有限公司 | Wet flue gas desulfurization method by adding magnesium limestone |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1559654A (en) * | 2004-03-01 | 2005-01-05 | 北京恩菲科技产业集团 | Wet method exhaust gas purification machine set for desulfur, dust removal, denitrogen, defluoring its purification method |
| CN101168118A (en) * | 2006-10-25 | 2008-04-30 | 宝山钢铁股份有限公司 | Sintering smoke wet method sulphur removing and dust removing technology |
-
2010
- 2010-12-17 CN CN 201010593336 patent/CN102000494A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1559654A (en) * | 2004-03-01 | 2005-01-05 | 北京恩菲科技产业集团 | Wet method exhaust gas purification machine set for desulfur, dust removal, denitrogen, defluoring its purification method |
| CN101168118A (en) * | 2006-10-25 | 2008-04-30 | 宝山钢铁股份有限公司 | Sintering smoke wet method sulphur removing and dust removing technology |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103801177A (en) * | 2014-01-27 | 2014-05-21 | 浙江大学 | Flue gas treatment method for simultaneous desulfurization, denitrification and demercuration by calcium and magnesium method |
| CN103801177B (en) * | 2014-01-27 | 2016-04-06 | 浙江大学 | A kind of flue gas processing method of calcium magnesium processes simultaneous SO_2 and NO removal demercuration |
| CN106334442A (en) * | 2016-11-11 | 2017-01-18 | 焦作和信冶金科技有限责任公司 | Liquid-phase desulphurization device and method for electrolytic aluminum flue gas |
| CN111013345A (en) * | 2019-12-05 | 2020-04-17 | 盛尼克能源环保技术(重庆)有限公司 | Wet flue gas desulfurization method by adding magnesium limestone |
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Application publication date: 20110406 |