CN105457477A - Sodium-calcium dual-alkali flue gas desulfurization method and system - Google Patents
Sodium-calcium dual-alkali flue gas desulfurization method and system Download PDFInfo
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- CN105457477A CN105457477A CN201610062432.4A CN201610062432A CN105457477A CN 105457477 A CN105457477 A CN 105457477A CN 201610062432 A CN201610062432 A CN 201610062432A CN 105457477 A CN105457477 A CN 105457477A
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- Prior art keywords
- sodium
- desulfurizing tower
- flue gas
- desulfurization
- calcium
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention provides a sodium-calcium dual-alkali flue gas desulfurization method and system. The method comprises the steps of flue gas desulfurization and sodium-based desulfurizer regeneration; in the flue gas desulfurization step, a sodium hydroxide solution is adopted as a desulfurization starting agent, the prepared sodium hydroxide solution is directly put into a desulfurization tower to wash flue gas to remove sulfur dioxide in the flue gas; in the sodium-based desulfurizer regeneration step, liquid obtained through a desulfurization reaction is reduced into a sodium-based desulfurizer through calcium hydroxide contained in a regeneration reaction tank, in the sodium-based desulfurizer regeneration process, the regeneration reaction tank is mechanically stirred, semi-aqueous calcium sulfite is filtered out from the regenerated sodium-based desulfurizer through a filter membrane filter and then oxidized into gypsum through air, and after the pH value of a clear solution obtained through filtering of the filter membrane filter is regulated by supplementing alkali, the clear solution is returned into the desulfurization tower to be used repeatedly as an absorption solution. According to the method and system, the gypsum quality can be improved, the alkali amount consumed in the regeneration process can be decreased, a spray system can be prevented from being blocked due to scaling, and the better sulfur dioxide absorption effect is achieved.
Description
Technical field
The present invention relates to fume treatment technical field, be specifically related to the two alkali fume desulphurization method of a kind of sodium calcium and system.
Background technology
Traditional lime stone-lime method flue gas desulfurization technique adopts calcium-based desulfurizing agent sulfur dioxide absorption, calcium-based desulfurizing agent and sulfur dioxide react the calcium sulfite, the calcium sulfate that generate, and due to the solubility of calcium sulfite, calcium sulfate less, very easily fouling in desulfurizing tower and pipeline, results in blockage.Fouling and clogging problem has a strong impact on the normal operation of desulphurization system, even has a strong impact on the normal work of steam generator system.The unfavorable factor brought to avoid calcium-based desulfurizing agent as far as possible, calcium method sulfur removal technology mostly needs to be equipped with corresponding forced oxidation system (aerating system), which increases initial investment and operating cost.Easily cause fouling and clogging problem with the calcium-based desulfurizing agent of cheapness, and adopt merely sodium base desulfurizer operating cost too high, desulfurization product not easily processes.In order to solve above-mentioned contradiction preferably, dual alkali scrubbing FGD process technology is arisen at the historic moment.
Dual alkali scrubbing FGD process technology comprises flue gas desulfurization course and sodium base desulfurizer regenerative process.In flue gas desulfurization course, adopt sodium hydroxide solution as startup desulfurizing agent, the sodium hydroxide solution prepared directly is squeezed into desulfurizing tower and is washed the sulfur dioxide removed in flue gas.Sodium Hydroxide Alkaline is strong, and after sulfur dioxide absorption, product solubility is large, can not cause supersaturation crystallization, not cause fouling and clogging problem.Afterwards, desulfurization product is reduced into sodium base desulfurizer through the calcium hydroxide of regenerated reactor, then returns the use of desulfurizing tower Inner eycle.
Following reaction is there is in dual alkali scrubbing FGD process process:
1) flue gas desulfurization course
2NaOH+SO
2=Na
2SO
3+H
2O
Na
2CO
3+SO
2=Na2SO
3+CO
2
The first two reaction is assist absorption reaction, needs the Na+ amount according to loss, supplement a small amount of alkali in production process;
Na
2sO
3+ SO
2+ H
2o=2NaHSO
3, this reaction is main absorption reaction;
Owing to using soda as absorbing liquid, therefore sediment can not be generated in absorption system.When the impact how many by oxygen content in flue gas and regeneration, oxidation affects, and following side reaction can occur and generate Na
2sO
4:
2Na
2SO
3+O
2=2Na
2SO
4
2) sodium base desulfurizer regenerative process
CaO+H
2o=Ca (OH)
2, this reaction is occur in quick lime slurrying and maturing process
2NaHSO
3+Ca(OH)
2=Na
2SO
3+CaSO
3·1/2H
2O
Na
2SO
3+Ca(OH)
2=2NaOH+CaSO
3·1/2H
2O
In regenerative process, key reaction generates Na
2sO
3, according to solubility product constant, there is secondary reaction and generate NaOH.
The Na containing a small amount of NaOH that regeneration obtains
2sO
3solution is sent absorption system back to and is reused.The calcium sulfite hemihydrate obtained generates gypsum (CaSO through oxidation
42H
2o).
In addition, in running, owing to also containing partial oxidation in flue gas, so also following oxidation reaction can be there is:
2CaSO
3·1/2H
2O+O
2+3H
2O=2CaSO
4·2H
2O
Double alkali method desulfurizing technology reduces investment and operating cost, compares the desulfurizing dust-collector being applicable to medium small boiler desulfurizing fly ash.
But there is following technical problem in existing double alkali method desulfurizing technology:
1), in flue gas desulfurization course, while NaOH and sulfur dioxide react, also can generate sodium carbonate with carbon dioxide reaction, a large amount of sodium carbonate enters in regeneration tank, consumes more calcium hydroxide.
2) in sodium base desulfurizer regenerative process, sodium sulfite and calcium hydroxide reaction are very fast, but sodium sulphate and the more difficult reaction of calcium hydroxide, this makes the content of sodium sulphate in desulfurated circulating water constantly increase, desulfuration efficiency constantly declines, and causes fume emission to exceed standard, and also causes caustic soda consumption amount greatly to increase.
3) in sodium base desulfurizer regenerative process, be oxidized to make calcium sulfite hemihydrate and generate gypsum, adopt the mode stirring aerating oxidation simultaneously, the method easily makes sodium sulfite be oxidized to sodium sulphate, because sodium sulphate is difficult to and calcium hydroxide reaction, need continuous supplemental hydrogen sodium oxide molybdena or sodium carbonate, add the consumption of alkali.In addition, sodium sulphate also will reduce the quality of gypsum.
4) because calcium sulfite effect of settling is poor, enter spray system, easily cause fouling when high ph-values.
5) because carrying out the aerating oxidation of calcium sulfite hemihydrate in regenerative process, oxidation effectiveness is poor, by calcium sulfite hemihydrate oxidation completely, can not cause gypsum water content greatly and containing a large amount of calcium sulfite, affect the quality of gypsum.
Above reason causes the soda consumption of double alkali method desulfurizing system large, and longtime running cost is high.Meanwhile, desulphurization system fouling is serious, often can only use when environment monitoring is checked and accepted.
Summary of the invention
The first object of the present invention is the deficiency existed to overcome prior art, the consumption provide a kind of and can improve gypsum qualitt, reducing alkali in regenerative process, avoids spray system because of fouling and clogging, the two alkali fume desulphurization method of sodium calcium with good sulfur dioxide assimilation effect.
The first object of the present invention is achieved through the following technical solutions: the two alkali fume desulphurization method of a kind of sodium calcium, comprise flue gas desulfurization step and sodium base desulfurizer regeneration step, in flue gas desulfurization step, adopt sodium hydroxide solution as startup desulfurizing agent, the sodium hydroxide solution prepared directly is squeezed into desulfurizing tower and wash the sulfur dioxide removed in flue gas; In sodium base desulfurizer regeneration step, the liquid that desulphurization reaction obtains is reduced into sodium base desulfurizer through the calcium hydroxide of regenerative response groove, in sodium base desulfurizer regenerative process, regenerative response groove adopts mechanical agitation, regenerate the sodium base desulfurizer obtained and leach calcium sulfite hemihydrate by membrane filter, rear calcium sulfite hemihydrate is gypsum through air oxidation, and membrane filter filters the clear liquid that obtains by after supplementing alkali adjust ph, returns in desulfurizing tower and recycles as absorbing liquid.
In flue gas desulfurization step, the step of the pre-desulfurization carried out also is included in pre-desulfurizing tower before desulfurizing tower desulfurization, the absorbing liquid carrying out desulfurization in desulfurizing tower is introduced in pre-desulfurizing tower, carry out pre-desulfurization to flue gas, the absorbing liquid carrying out pre-desulfurization is introduced in the regenerative response groove of sodium base desulfurizer regeneration step.
The second object of the present invention is the deficiency existed to overcome prior art, the consumption provide a kind of and can improve gypsum qualitt, reducing alkali in regenerative process, avoids spray system because of fouling and clogging, the two alkali flue gas desulphurization system of sodium calcium with good sulfur dioxide assimilation effect.
The present invention second object is achieved through the following technical solutions: the two alkali flue gas desulphurization system of a kind of sodium calcium, comprise pre-desulfurizing tower, desulfurizing tower, chimney, be provided with regenerative response groove and the membrane filter of mechanical agitation mechanism, the exhanst gas outlet of described pre-desulfurizing tower is connected by the smoke inlet of pipeline with described desulfurizing tower, the exhanst gas outlet of described desulfurizing tower is connected with described chimney, the outlet of described regenerative response groove is connected by the entrance of pipeline with described membrane filter, the purified liquor outlet of described membrane filter is connected with the absorbing liquid entrance of described desulfurizing tower by pipeline, the absorbing liquid outlet of described desulfurizing tower is connected by the absorbing liquid entrance of pipeline with described pre-desulfurizing tower, the absorbing liquid outlet of described pre-desulfurizing tower is connected with the entrance of described regenerative response groove.
The invention has the beneficial effects as follows: the present invention can improve gypsum qualitt, reduce moisture content; The present invention avoids being oxidized to sodium sulphate at regenerative process sulfite sodium, decreases the consumption of alkali, it also avoid the quality that sodium sulphate reduces gypsum; By arranging membrane filter, leaching calcium sulfite hemihydrate, calcium hydroxide and other impurity, preventing calcium sulfite and calcium hydroxide and other impurity from entering the spray system of desulfurizing tower, causing fouling; The isolated clear liquid of membrane filter, with supplementing alkali adjust ph, makes absorbing liquid have optimal absorption effect; Absorbing liquid is after the two-step desulfurization reaction of desulfurizing tower and pre-desulfurizing tower, and pH value reduces, and improves regeneration efficiency.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail.
See Fig. 1, the two alkali flue gas desulphurization system of a kind of sodium calcium, comprise pre-desulfurizing tower, desulfurizing tower, chimney, be provided with regenerative response groove and the membrane filter of mechanical agitation mechanism, the exhanst gas outlet of pre-desulfurizing tower is connected with the smoke inlet of desulfurizing tower by pipeline, the exhanst gas outlet of desulfurizing tower is connected with chimney, the outlet of regenerative response groove is connected with the entrance of membrane filter by pipeline, the purified liquor outlet of membrane filter is connected with the absorbing liquid entrance of desulfurizing tower by pipeline, the absorbing liquid outlet of desulfurizing tower is connected with the absorbing liquid entrance of pre-desulfurizing tower by pipeline, the absorbing liquid outlet of pre-desulfurizing tower is connected with the entrance of regenerative response groove.
The two alkali fume desulphurization method of a kind of sodium calcium, comprise flue gas desulfurization step and sodium base desulfurizer regeneration step, in flue gas desulfurization step, adopt sodium hydroxide solution as startup desulfurizing agent, the sodium hydroxide solution prepared directly is squeezed into desulfurizing tower and wash the sulfur dioxide removed in flue gas; In sodium base desulfurizer regeneration step, the liquid that desulphurization reaction obtains is reduced into sodium base desulfurizer through the calcium hydroxide of regenerative response groove, in sodium base desulfurizer regenerative process, regenerative response groove adopts mechanical agitation, regenerate the sodium base desulfurizer obtained and leach calcium sulfite hemihydrate by membrane filter, rear calcium sulfite hemihydrate is gypsum through air oxidation, and membrane filter filters the clear liquid that obtains by after supplementing alkali adjust ph, returns in desulfurizing tower and recycles as absorbing liquid.
Because the oxidation effectiveness of the aerating oxidation carrying out calcium sulfite hemihydrate in regenerative process is poor, by calcium sulfite hemihydrate oxidation completely, can not cause gypsum water content greatly and containing a large amount of calcium sulfite, affect the quality of gypsum.The oxidation of existing regenerative response groove is stirred and changes mechanical agitation into, after the step of calcium sulfite hemihydrate oxidation generation gypsum is placed on membrane filtration, improves oxidation efficiency, improve gypsum qualitt, reduce moisture content.After the step of calcium sulfite hemihydrate oxidation generation gypsum is placed on membrane filtration, also avoids being oxidized to sodium sulphate at regenerative process sulfite sodium, decrease the consumption of alkali, it also avoid the quality that sodium sulphate reduces gypsum.Due to calcium sulfite hemihydrate differential settlement, by arranging membrane filter, leaching calcium sulfite hemihydrate, calcium hydroxide and other impurity, preventing calcium sulfite and calcium hydroxide and other impurity from entering the spray system of desulfurizing tower, causing fouling.The isolated clear liquid of membrane filter, with supplementing alkali adjust ph, makes absorbing liquid have optimal absorption effect.
In flue gas desulfurization step, the step of the pre-desulfurization carried out also is included in pre-desulfurizing tower before desulfurizing tower desulfurization, the absorbing liquid carrying out desulfurization in desulfurizing tower is introduced in pre-desulfurizing tower, carry out pre-desulfurization to flue gas, the absorbing liquid carrying out pre-desulfurization is introduced in the regenerative response groove of sodium base desulfurizer regeneration step.Absorbing liquid is after the two-step desulfurization reaction of desulfurizing tower and pre-desulfurizing tower, and pH value reduces, and improves regeneration efficiency.
Finally should be noted that; above content is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; the simple modification that those of ordinary skill in the art carries out technical scheme of the present invention or equivalently to replace, does not all depart from essence and the scope of technical solution of the present invention.
Claims (3)
1. the two alkali fume desulphurization method of sodium calcium, comprise flue gas desulfurization step and sodium base desulfurizer regeneration step, in flue gas desulfurization step, adopt sodium hydroxide solution as startup desulfurizing agent, the sodium hydroxide solution prepared directly is squeezed into desulfurizing tower and wash the sulfur dioxide removed in flue gas; In sodium base desulfurizer regeneration step, the liquid that desulphurization reaction obtains is reduced into sodium base desulfurizer through the calcium hydroxide of regenerative response groove, it is characterized in that: in sodium base desulfurizer regenerative process, regenerative response groove adopts mechanical agitation, regenerate the sodium base desulfurizer obtained and leach calcium sulfite hemihydrate by membrane filter, rear calcium sulfite hemihydrate is gypsum through air oxidation, and membrane filter filters the clear liquid that obtains by after supplementing alkali adjust ph, returns in desulfurizing tower and recycles as absorbing liquid.
2. the two alkali fume desulphurization method of sodium calcium according to claim 1, it is characterized in that: in flue gas desulfurization step, the step of the pre-desulfurization carried out also is included in pre-desulfurizing tower before desulfurizing tower desulfurization, the absorbing liquid carrying out desulfurization in desulfurizing tower is introduced in pre-desulfurizing tower, carry out pre-desulfurization to flue gas, the absorbing liquid carrying out pre-desulfurization is introduced in the regenerative response groove of sodium base desulfurizer regeneration step.
3. the two alkali flue gas desulphurization system of sodium calcium, it is characterized in that: the two alkali flue gas desulphurization system of described sodium calcium comprises pre-desulfurizing tower, desulfurizing tower, chimney, be provided with regenerative response groove and the membrane filter of mechanical agitation mechanism, the exhanst gas outlet of described pre-desulfurizing tower is connected by the smoke inlet of pipeline with described desulfurizing tower, the exhanst gas outlet of described desulfurizing tower is connected with described chimney, the outlet of described regenerative response groove is connected by the entrance of pipeline with described membrane filter, the purified liquor outlet of described membrane filter is connected with the absorbing liquid entrance of described desulfurizing tower by pipeline, the absorbing liquid outlet of described desulfurizing tower is connected by the absorbing liquid entrance of pipeline with described pre-desulfurizing tower, the absorbing liquid outlet of described pre-desulfurizing tower is connected with the entrance of described regenerative response groove.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106390704A (en) * | 2016-06-21 | 2017-02-15 | 太仓市顺邦防腐设备有限公司 | A system for treating sulfur containing flue gas by utilizing sodium sulfite |
| CN106422739A (en) * | 2016-10-27 | 2017-02-22 | 航天环境工程有限公司 | Calcium-process catalytic cracking flue gas desulfurizing and dedusting system and application |
| CN106890505A (en) * | 2017-04-14 | 2017-06-27 | 哈尔滨理工大学 | A kind of double alkali method desulfurizing system filters intermediate processing |
| CN107008121A (en) * | 2017-05-24 | 2017-08-04 | 中国华电集团科学技术研究总院有限公司 | A kind of flue gas removal sulfur dioxide method and device |
| CN107051179A (en) * | 2017-06-15 | 2017-08-18 | 永兴县鸿福金属有限公司 | A kind of smelting exhaust ball milling intensified lime absorption process |
| CN107126830A (en) * | 2017-06-30 | 2017-09-05 | 上海宝钢节能环保技术有限公司 | Coke oven flue gas sodium calcium base combined desulfurization dedusting SDG system and method based on SDA methods |
| CN109127644A (en) * | 2017-06-16 | 2019-01-04 | 中国石油天然气股份有限公司 | A kind of processing method of discarded ferric oxide desulfurizer |
| CN109694955A (en) * | 2019-02-20 | 2019-04-30 | 湘潭大学 | A kind of pre- sulfur method of lead plaster based on the double alkali of sodium calcium |
| CN110102169A (en) * | 2019-06-12 | 2019-08-09 | 禄丰天宝磷化工有限公司 | Exhaust treatment system in a kind of sulfuric acid preparation process |
| CN110368800A (en) * | 2019-08-09 | 2019-10-25 | 浙江大学 | Sodium base flue gas desulfurization byproduct processing unit and processing method |
| CN110841463A (en) * | 2019-09-29 | 2020-02-28 | 上海交通大学 | Red mud dealkalization method coupled with calcium flue gas desulfurization process |
| CN111167273A (en) * | 2018-11-13 | 2020-05-19 | 湖南省金翼有色金属综合回收有限公司 | Flue tail gas desulfurization device and process thereof |
| CN111701436A (en) * | 2020-06-23 | 2020-09-25 | 湖北真诚纸业有限公司 | Novel dual-alkali desulfurization method |
| CN112961710A (en) * | 2021-03-15 | 2021-06-15 | 中原工学院 | Novel blast furnace gas desulfurization method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106390704A (en) * | 2016-06-21 | 2017-02-15 | 太仓市顺邦防腐设备有限公司 | A system for treating sulfur containing flue gas by utilizing sodium sulfite |
| CN106422739A (en) * | 2016-10-27 | 2017-02-22 | 航天环境工程有限公司 | Calcium-process catalytic cracking flue gas desulfurizing and dedusting system and application |
| CN106422739B (en) * | 2016-10-27 | 2022-07-15 | 航天环境工程有限公司 | Calcium-method catalytic cracking flue gas desulfurization and dust removal system and application thereof |
| CN106890505A (en) * | 2017-04-14 | 2017-06-27 | 哈尔滨理工大学 | A kind of double alkali method desulfurizing system filters intermediate processing |
| CN107008121A (en) * | 2017-05-24 | 2017-08-04 | 中国华电集团科学技术研究总院有限公司 | A kind of flue gas removal sulfur dioxide method and device |
| CN107051179A (en) * | 2017-06-15 | 2017-08-18 | 永兴县鸿福金属有限公司 | A kind of smelting exhaust ball milling intensified lime absorption process |
| CN109127644A (en) * | 2017-06-16 | 2019-01-04 | 中国石油天然气股份有限公司 | A kind of processing method of discarded ferric oxide desulfurizer |
| CN107126830A (en) * | 2017-06-30 | 2017-09-05 | 上海宝钢节能环保技术有限公司 | Coke oven flue gas sodium calcium base combined desulfurization dedusting SDG system and method based on SDA methods |
| CN111167273A (en) * | 2018-11-13 | 2020-05-19 | 湖南省金翼有色金属综合回收有限公司 | Flue tail gas desulfurization device and process thereof |
| CN111167273B (en) * | 2018-11-13 | 2023-12-12 | 湖南省金翼有色金属综合回收有限公司 | Flue tail gas desulfurization device and process thereof |
| CN109694955A (en) * | 2019-02-20 | 2019-04-30 | 湘潭大学 | A kind of pre- sulfur method of lead plaster based on the double alkali of sodium calcium |
| CN110102169A (en) * | 2019-06-12 | 2019-08-09 | 禄丰天宝磷化工有限公司 | Exhaust treatment system in a kind of sulfuric acid preparation process |
| CN110368800A (en) * | 2019-08-09 | 2019-10-25 | 浙江大学 | Sodium base flue gas desulfurization byproduct processing unit and processing method |
| CN110841463A (en) * | 2019-09-29 | 2020-02-28 | 上海交通大学 | Red mud dealkalization method coupled with calcium flue gas desulfurization process |
| CN111701436A (en) * | 2020-06-23 | 2020-09-25 | 湖北真诚纸业有限公司 | Novel dual-alkali desulfurization method |
| CN112961710A (en) * | 2021-03-15 | 2021-06-15 | 中原工学院 | Novel blast furnace gas desulfurization method |
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Application publication date: 20160406 |