CN103055686A - Method for removing sulfur dioxide in flue gas by papermaking white mud - Google Patents
Method for removing sulfur dioxide in flue gas by papermaking white mud Download PDFInfo
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- CN103055686A CN103055686A CN2012105846915A CN201210584691A CN103055686A CN 103055686 A CN103055686 A CN 103055686A CN 2012105846915 A CN2012105846915 A CN 2012105846915A CN 201210584691 A CN201210584691 A CN 201210584691A CN 103055686 A CN103055686 A CN 103055686A
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- flue gas
- sulfur dioxide
- white mud
- tower
- white clay
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Abstract
The invention discloses a method for removing sulfur dioxide in flue gas by papermaking white mud. The method comprises the following steps that papermaking white mud and water are fully mixed by stirring; MgO is added into the mixture to form white mud slurry; in a desulfurization tower, the white mud slurry and flue gas bubbling from the tower bottom undergo a contact reaction in a tower top spraying way; an upper liquid of the reaction solution enters into the desulfurization tower and undergoes a circular reaction; a lower liquid of the reaction solution outflows from the bottom of the desulfurization tower, is subjected to sedimentation and dehydration and then is discharged; and the discharged solution is clarified and then is recycled. The method for removing sulfur dioxide in flue gas by papermaking white mud has the advantages of high desulfurization efficiency, simple equipment and processes, and low cost.
Description
Technical field
The present invention relates to a kind of method of utilizing paper white sludge to remove the sulfur dioxide in the flue gas.
Background technology
Paper white sludge is the discarded object in paper mill, derive from alkali recovery stage between the alkali recovery vehicle, black liquor of pulp making is through evaporation and concentration, obtain fused mass in the alkali recovery furnace roasting, the water-soluble green liquor that is, then lime is added and carry out the white depositions that causticizing reaction obtains in the green liquor, be paper white sludge, its main component is CaCO
3, after white clay is drained into rivers, ecological environment is caused very serious harm and pollution.Present processing method has following several: the one, and pure wood pulp white clay can be sintered into lime and be recycled, but needs higher cost recovery; The 2nd, minority papermaking enterprise with good conditionsi is sent to the outlet that less demanding cement plant or brick field solve the part white clay nearby; The 3rd, most enterprises treat white clay and take to transport outward landfill or directly emit.
Contain a large amount of SO in the coal-fired flue-gas
2And NO
X, being discharged in the atmosphere has very large harm to environment, be subject to the common concern of countries in the world, and China is producing coal and uses coal big country, at present to SO
2Emission control need need to be resolved hurrily.The flue dust desulfur technology mainly is divided into dry desulfurization and wet desulphurization, and the method that at present wet desulphurization is both at home and abroad adopted mainly contains two alkaline process (being mainly NaOH and calcium oxide), limestone-gypsum method, magnesium oxide method etc.Paper white sludge contains a large amount of CaCO
3, with it as absorption from flue gas SO
2Desulfurizing agent, both can solve the problem of environmental pollution of white clay and flue gas, can the fully utilizing of discarded object be turned waste into wealth again, economize on resources.Experts and scholars are to utilizing paper white sludge to remove SO in the flue gas both at home and abroad
2Technique carried out relevant research, but owing to be subject to the restriction of process route condition, desulfuration efficiency is the highest can only reach 85%.
Summary of the invention
The purpose of this invention is to provide that a kind of equipment is simple, desulfuration efficiency is high, can turn waste into wealth, the paper white sludge that utilizes with low cost removes the method for the sulfur dioxide in the flue gas.
The method of utilizing paper white sludge to remove the sulfur dioxide in the flue gas provided by the present invention comprises the steps:
Paper white sludge and water are fully mixed, add MgO and obtain the white clay slurries, the white clay slurries adopt cat head spray mode and the flue gas haptoreaction of steeping up from the tower pucking in the desulfurization Tata, the upper strata liquid of solution is by entering circular response in the desulfurizing tower after the reaction, the subnatant of solution is flowed out by the desulfurizing tower bottom after the reaction, discharge after precipitation, processed, the water of deviating from carries out recycling after the clear processing.
The method of utilizing paper white sludge to remove the sulfur dioxide in the flue gas of the present invention, wherein: the mass concentration of white clay is 20%～30% in the described white clay slurries.
The method of utilizing paper white sludge to remove the sulfur dioxide in the flue gas of the present invention, wherein: the mass concentration of MgO is 0.05%～0.2% in the described white clay slurries.
The method of utilizing paper white sludge to remove the sulfur dioxide in the flue gas of the present invention, wherein: CaCO in the described paper white sludge
3Content is more than 80%.
The method of utilizing paper white sludge to remove the sulfur dioxide in the flue gas of the present invention, mode and the flue gas reaction of in desulfurizing tower, adopting cat head white clay slurries spray and tower bottom flue gas bell to combine, desulfuration efficiency is higher; Reacted slurries at the bottom of the tower, a part is recycled to cat head and again sprays reaction, has utilized more fully the CaCO in the paper white sludge
3Byproduct after the desulfurization is carried out processed, can be used as the raw material of producing other products; The method equipment and process that utilizes paper white sludge to remove the sulfur dioxide in the flue gas of the present invention is simple, with low cost.
Description of drawings
Fig. 1 utilizes paper white sludge to remove the schematic flow sheet of the method for the sulfur dioxide in the flue gas.
The specific embodiment
Utilize paper white sludge to remove the desulfurization principle of the method for the sulfur dioxide in the flue gas:
SO
2+ H
2O → H
2SO
3(absorption)
CaCO
3+ H
2SO
3→ CaSO
3+ CO
2+ H
2O (neutralization)
CaSO
3+ 1/2O
2→ CaSO
4(oxidation)
CaSO
3+ 1/2H
2O → CaSO
31/2H
2O (crystallization)
CaSO
4+ 2H
2O → CaSO
42H
2O (crystallization)
CaSO
3+ H
2SO
3→ Ca (HSO
3)
2(pH control)
Utilize method that paper white sludge removes the sulfur dioxide in the flue gas as shown in Figure 1, paper white sludge and water are joined in the size-mixing tank, fully mix, add MgO and obtain the white clay slurries, wherein the mass concentration of white clay is that the mass concentration of 20%～30%, MgO is 0.05%～0.2%; The white clay slurries enter into slurry pool, pumped in the desulfurizing tower by force (forcing) pump, slurries adopt cat head spray mode and the flue gas haptoreaction of steeping up from the tower pucking in tower, the part upper strata liquid of solution pumps into circular response in the desulfurizing tower by force (forcing) pump after the reaction, another part solution is flowed out by the desulfurizing tower bottom, enter in the sedimentation basin, as the raw material of other products, the recirculated water of removing precipitation enters into depositing reservoir and participates in recycling after the precipitation process processed.In order to make sulfur dioxide desulfurization efficient higher, CaCO in the paper white sludge
3Content is preferably in more than 80%.
The sulfur dioxide desulfurization efficient of utilizing paper white sludge to remove in the flue gas reaches more than 95%, and utilizes paper white sludge can reduce the pollution of environment as desulfurizing agent, resource is reasonably used and has good application and promotional value.
Above embodiment is described preferred embodiment of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that the common engineers and technicians in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (4)
1. utilize paper white sludge to remove the method for the sulfur dioxide in the flue gas, comprise the steps:
Paper white sludge and water are fully mixed, add MgO and obtain the white clay slurries, the white clay slurries adopt cat head spray mode and the flue gas haptoreaction of steeping up from the tower pucking in the desulfurization Tata, the upper strata liquid of solution is by entering circular response in the desulfurizing tower after the reaction, the subnatant of solution is flowed out by the desulfurizing tower bottom after the reaction, discharge after precipitation, processed, the water of deviating from carries out recycling after the clear processing.
2. method according to claim 1, it is characterized in that: the mass concentration of white clay is 20%～30% in the described white clay slurries.
3. method according to claim 1 and 2, it is characterized in that: the mass concentration of MgO is 0.05%～0.2% in the described white clay slurries.
4. method according to claim 3 is characterized in that: CaCO in the described paper white sludge
3Content is more than 80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105846915A CN103055686A (en) | 2012-12-28 | 2012-12-28 | Method for removing sulfur dioxide in flue gas by papermaking white mud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105846915A CN103055686A (en) | 2012-12-28 | 2012-12-28 | Method for removing sulfur dioxide in flue gas by papermaking white mud |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103055686A true CN103055686A (en) | 2013-04-24 |
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ID=48098758
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|---|---|---|---|
| CN2012105846915A Pending CN103055686A (en) | 2012-12-28 | 2012-12-28 | Method for removing sulfur dioxide in flue gas by papermaking white mud |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104307342A (en) * | 2014-11-07 | 2015-01-28 | 广西南宁华国环境科技有限公司 | Two-stage flue gas desulfurizing tower |
| CN105854559A (en) * | 2016-05-04 | 2016-08-17 | 山东源根化学技术研发有限公司 | Novel papermaking white mud desulfurization device and process |
| CN114258444A (en) * | 2019-08-22 | 2022-03-29 | 维美德技术有限公司 | Method and system for adjusting pH value of green liquid slag |
| CN114405238A (en) * | 2022-02-28 | 2022-04-29 | 重庆外宇科技有限公司 | Electrical automatic control system for waste gas treatment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1709554A (en) * | 2005-05-16 | 2005-12-21 | 吴金泉 | Process for removing sulfur dioxide for smoke using papermaking white mud |
-
2012
- 2012-12-28 CN CN2012105846915A patent/CN103055686A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1709554A (en) * | 2005-05-16 | 2005-12-21 | 吴金泉 | Process for removing sulfur dioxide for smoke using papermaking white mud |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104307342A (en) * | 2014-11-07 | 2015-01-28 | 广西南宁华国环境科技有限公司 | Two-stage flue gas desulfurizing tower |
| CN105854559A (en) * | 2016-05-04 | 2016-08-17 | 山东源根化学技术研发有限公司 | Novel papermaking white mud desulfurization device and process |
| CN105854559B (en) * | 2016-05-04 | 2020-09-04 | 山东源根化学技术研发有限公司 | Papermaking white mud desulfurization device and desulfurization process |
| CN114258444A (en) * | 2019-08-22 | 2022-03-29 | 维美德技术有限公司 | Method and system for adjusting pH value of green liquid slag |
| CN114258444B (en) * | 2019-08-22 | 2023-05-05 | 维美德技术有限公司 | Method and system for adjusting pH value of green liquor residue |
| CN114405238A (en) * | 2022-02-28 | 2022-04-29 | 重庆外宇科技有限公司 | Electrical automatic control system for waste gas treatment |
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Application publication date: 20130424 |