CN102773003A - Limestone slurry dispersing agent for limestone wet desulfurization and preparation method thereof - Google Patents
Limestone slurry dispersing agent for limestone wet desulfurization and preparation method thereof Download PDFInfo
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- CN102773003A CN102773003A CN2012102424926A CN201210242492A CN102773003A CN 102773003 A CN102773003 A CN 102773003A CN 2012102424926 A CN2012102424926 A CN 2012102424926A CN 201210242492 A CN201210242492 A CN 201210242492A CN 102773003 A CN102773003 A CN 102773003A
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Abstract
The invention relates to the field of limestone wet flue gas desulfurization, and in particular relates to a limestone slurry dispersing agent and a preparation method thereof. The limestone slurry dispersing agent for limestone wet desulfurization is characterized by being formed by mixing the following raw materials in parts by mass: 25 to 45 parts of organic polycarboxylate dispersing agent and 10 to 20 parts of inorganic polyphosphate dispersing agent. The fineness and viscosity of the limestone slurry can be reduced, and the uniformity, stability and liquidity of the slurry are improved, so that the quality of the limestone slurry is improved, and the efficiency of a desulfurization system is improved.
Description
Technical field
The present invention relates to limestone wet-process flue gas desulfurization field, be specifically related to a kind of lime stone slurry dispersant and preparation method thereof.
Background technology
Wet process of FGD obtains to use widely on coal-fired power plant and middle and small burn coal boiler, becomes the world today and attendes the leading technology of desulfurization that coal-fired power plant adopts.This is because wet process of FGD efficient is high, equipment is little, easy to control, floor space is little and be applicable to senior middle school's low-sulfur coal etc.At present, at home and abroad in the coal-fired power plant, wet process of FGD accounts for about 85% of total flue gas desulfurization, and the trend that increases is year by year arranged.In China's middle and small burn coal boiler, wet process of FGD accounts for more than 98%, near 100%.
In wet method limestone/lime-gypsum flue gas desulfurization; Because the lime stone source is abundant, price is more much lower than lime, has formed wet method lime stone-gypsum flue gas desulfurization technology for many years; And at home and abroad obtain to use widely in the coal-fired power plant, its application quantity has the trend that increases year by year.Wet method limestone/lime technology is applicable to high, medium and low sulphur coal.
The wet process of FGD technology; Especially limestone/lime flue gas desulfurization technique; Except that coal-fired power plant obtains extensive use, in flue gas desulfurizations such as sulfuric acid industry, steel and iron industry, colored metallurgical industrial, petrochemical industry and coal-fired industrial furnace, also obtain to use widely.
The preparation of lime stone slurry generally has two kinds of methods: a kind of is that agstone is processed in the limestone particle dry grinding, is equipped with a certain proportion of fresh water (FW) again and is mixed into lime stone slurry; Another kind is that limestone particle and water are milled into lime stone slurry together, the desulfurization wet-milling pulping system of promptly often saying, and this method is because operating cost is relatively low, and environmental pollution is little, is extensively adopted by the thermal power plant.The fineness of lime stone slurry refers to the size of limestone particle in the slurries, and its height is directly connected to system's desulfuration efficiency and the quality that generates gypsum.
In wet process of FGD, fouling and obstruction usually take place in equipment.Equipment scaling has become some absorption equipments with stopping up
The normal key issue of long-time running.For this reason, at first to understand the mechanism of fouling, influence fouling and result in blockage because of
Element, then targetedly from technological design, device structure, the aspect such as control and address.
The fouling of desulphurization system can cause absorption tower, oxidation trough, pipeline, nozzle, demister device, heat exchanger fouling and obstruction with stopping up.Its reason is that oxygen in the flue gas is with CaSO
3Be oxidized into CaSO
4(gypsum), and make the gypsum supersaturation.This phenomenon mainly occurs in the wet method system of autoxidation, and control measure are forced oxidation and inhibition oxidation.
The method that prevents fouling and obstruction that some are common, in technological operation, water evaporates speed and evaporation capacity in the control absorption liquid; The pH value of control solution; The material that is easy to crystallization in the control solution is not wanted supersaturation; Keep solution that certain crystal seed is arranged; Strict dedusting, the fume amount that control flue gas entering absorption system is brought into, device structure will be made particular design, or selects absorption equipment less scaling and that stop up for use, and for example the thermopnore scrubbing tower is than the less scaling and obstruction of fixing filling scrubbing tower; Select smooth surface, uncorruptible material absorption equipment.
Remove during coal burning and generate SO
2In addition, also generate a spot of SO
3, the concentration of SO3 is 10～40ppm in the flue gas.Owing to contain water (4%～12%), the SO of generation in the flue gas
3Form sulfuric acid mist in moment.When temperature was low, sulfuric acid mist condensed on the inwall of sulfuric acid attached to equipment, or is dissolved in the cleaning solution.The main cause that the corrosion of Here it is wet absorption tower and relevant devices is quite serious.Solution mainly contains: adopt resistant material to make the absorption tower, make absorption tower and relevant devices as adopting stainless steel, fiber glass epoxy, PVC-U, pottery etc.; Equipment coated inner wall anti-corrosion material is as applying waterglass etc.; Equipment liner rubber etc.
Summary of the invention
The object of the present invention is to provide a kind of lime stone slurry dispersant that is used for the limestone wet-process desulfurization and preparation method thereof, this dispersant can reduce the fineness and the viscosity of lime stone slurry.
To achieve these goals; The technical scheme that the present invention taked is: a kind of lime stone slurry dispersant that is used for the limestone wet-process desulfurization; It is characterized in that it is formed by organic polycarboxylate salt dispersant and inorganic polyphosphate dispersant, the shared mass fraction of each raw material is:
25～45 parts of organic polycarboxylate salt dispersants, 10～20 parts of inorganic polyphosphate dispersants.
Said organic polycarboxylate salt dispersant is Sodium Polyacrylate (PAAS), any one in the sodium salt (AA-AMPS) of acrylic acid and 2-acrylamido-2-methyl propane sulfonic acid sodium copolymer or two kinds of mixing by any proportioning.The mean molecule quantity of organic polycarboxylate should be between 2000～5000.
Said inorganic polyphosphate dispersant is any one or any two kinds of mixing by any proportioning in sodium phosphate trimer, the calgon.
Above-mentioned a kind of preparation method who is used for the lime stone slurry dispersant of limestone wet-process desulfurization is characterized in that it comprises the steps:
1) choosing of raw material: the shared mass fraction of each raw material is: 25～45 parts of organic polycarboxylate salt dispersants, and 10～20 parts of inorganic polyphosphate dispersants are chosen organic polycarboxylate salt dispersant and inorganic polyphosphate dispersant;
2), obtain being used for the lime stone slurry dispersant of limestone wet-process desulfurization with organic polycarboxylate salt dispersant and inorganic polyphosphate dispersant.
The inorganic polyphosphate dispersant adsorption makes mud form charged electric double layer on the surface of mud, and is theoretical according to DELO; Charged particle each other near the time; Electric double layer produces overlapping, and Zeta potential obviously increases, and electrostatic repulsion increases; Particle is difficult to reunite, thereby plays the static steric hindrance; Organic polycarboxylate salt dispersant is adsorbed in solid particles surface through high molecular polymer, and its solvent chain is fully expansion in medium, forms the steric hindrance layer and stops the flocculation of solids to be reunited, and reaches sterically hindered effect.Therefore under the composite dispersing agent effect, can form static steric hindrance, sterically hindered double effect.
The invention has the beneficial effects as follows: the lime stone slurry dispersant that is used for the limestone wet-process desulfurization provided by the invention; Can reduce the fineness and the viscosity of lime stone slurry; Improve homogeneity, the stability and mobile of slurries, thereby improve the quality of lime stone slurry, improve the efficient of desulphurization system; In sweetening process; This dispersant through chelating Fe, Mn, Cu etc. can the catalysis calcium sulfite oxidation metal ion; Suppress the oxidation of calcium sulfite, thereby suppress to be easy to the gypsum generation of fouling, this dispersant can also improve the saturation degree that is easy to crystalline material; Disperse the dirt layer, prevent the fouling obstruction; This dispersant also has certain corrosion inhibition, improves service life of equipment.
The specific embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to following embodiment.Raw materials used all the purchase from market of the present invention obtains.
Embodiment 1
A kind of lime stone slurry dispersant that is used for the limestone wet-process desulfurization comprises (1) Sodium Polyacrylate (PAAS); (2) sodium salt (AA-AMPS) of acrylic acid and 2-acrylamido-2-methyl propane sulfonic acid sodium copolymer; (3) sodium phosphate trimer.The shared mass fraction of each raw material is:
25 parts of Sodium Polyacrylates (PAAS),
15 parts of the sodium salts (AA-AMPS) of acrylic acid and 2-acrylamido-2-methyl propane sulfonic acid sodium copolymer,
15 parts of sodium phosphate trimers.
Above-mentioned raw materials is mixed, obtain being used for the lime stone slurry dispersant of limestone wet-process desulfurization.
Use: adding dose is 0.3%～0.7% of lime stone quality.
Application result:
| ? | Solids content, % | Granularity (<=2 μ m), % | Viscosity, mPa/s | Desulfuration efficiency | Obvious scale formation |
| Before the use | 70.0 | 88.30 | 510 | 96.20 | 10 days |
| After the use | 72.0 | 90.21 | 190 | 98.90 | 15 days |
Explain that this dispersant can reduce the fineness and the viscosity of lime stone slurry.
Embodiment 2
A kind of lime stone slurry dispersant that is used for the limestone wet-process desulfurization comprises (1) Sodium Polyacrylate (PAAS); (2) sodium salt (AA-AMPS) of acrylic acid and 2-acrylamido-2-methyl propane sulfonic acid sodium copolymer; (3) calgon.The shared mass fraction of each raw material is:
20 parts of PAAS,
20 parts of AA-AMPS,
10 parts of calgons.
Above-mentioned raw materials is mixed, obtain being used for the lime stone slurry dispersant of limestone wet-process desulfurization.
Use: adding dose is 0.3%～0.7% of lime stone quality.
Application result:
| ? | Solids content, % | Granularity (<=2 μ m), % | Viscosity, mPa/s | Desulfuration efficiency | Obvious scale formation |
| Before the use | 69.40 | 87.68 | 550 | 96.80 | 10 days |
| After the use | 71.8 | 90.21 | 200 | 99.10 | 14 days |
Explain that this dispersant can reduce the fineness and the viscosity of lime stone slurry.
Embodiment 3
A kind of lime stone slurry dispersant that is used for the limestone wet-process desulfurization comprises (1) Sodium Polyacrylate (PAAS); (2) sodium salt (AA-AMPS) of acrylic acid and 2-acrylamido-2-methyl propane sulfonic acid sodium copolymer; (3) sodium phosphate trimer; (4) calgon.The shared mass fraction of each raw material is:
15 parts of PAAS,
25 parts of AA-AMPS,
5% part of sodium phosphate trimer,
5% part of calgon.
Above-mentioned raw materials is mixed, obtain being used for the lime stone slurry dispersant of limestone wet-process desulfurization.
Use: adding dose is 0.3%～0.7% of lime stone quality.
Application result:
| ? | Solids content, % | Granularity (<=2 μ m), % | Viscosity, mPa/s | Desulfuration efficiency | Obvious scale formation |
| Before the use | 70.7 | 86.98 | 610 | 97.10 | 10 days |
| After the use | 72.5 | 89.80 | 180 | 99.40 | 14 days |
Explain that this dispersant can reduce the fineness and the viscosity of lime stone slurry.
Embodiment 4
A kind of lime stone slurry dispersant that is used for the limestone wet-process desulfurization comprises (1) Sodium Polyacrylate (PAAS); (2) calgon.The shared mass fraction of each raw material is:
40 parts of PAAS,
15 parts of calgons.
Above-mentioned raw materials is mixed, obtain being used for the lime stone slurry dispersant of limestone wet-process desulfurization.
Use: adding dose is 0.3%～0.7% of lime stone quality.
Application result:
| ? | Solids content, % | Granularity (<=2 μ m), % | Viscosity, mPa/s | Desulfuration efficiency | Obvious scale formation |
| Before the use | 70.03 | 87.65 | 550 | 96.50 | 10 days |
| After the use | 72.10 | 90.26 | 190 | 98.90 | 15 days |
Explain that this dispersant can reduce the fineness and the viscosity of lime stone slurry.
Embodiment 5
A kind of lime stone slurry dispersant that is used for the limestone wet-process desulfurization comprises (1) Sodium Polyacrylate (PAAS); (2) calgon.The shared mass fraction of each raw material is:
25 parts of Sodium Polyacrylates (PAAS),
20 parts of calgons.
Above-mentioned raw materials is mixed, obtain being used for the lime stone slurry dispersant of limestone wet-process desulfurization.
Use: adding dose is 0.3%～0.7% of lime stone quality.
Application result:
| ? | Solids content, % | Granularity (<=2 μ m), % | Viscosity, mPa/s | Desulfuration efficiency | Obvious scale formation |
| Before the use | 70.0 | 88.30 | 510 | 96.20 | 10 days |
| After the use | 72.0 | 90.0 | 190 | 98.0 | 15 days |
Explain that this dispersant can reduce the fineness and the viscosity of lime stone slurry.
Embodiment 6
A kind of lime stone slurry dispersant that is used for the limestone wet-process desulfurization comprises (1) Sodium Polyacrylate (PAAS); (2) calgon.The shared mass fraction of each raw material is:
45 parts of PAAS,
10 parts of calgons.
Above-mentioned raw materials is mixed, obtain being used for the lime stone slurry dispersant of limestone wet-process desulfurization.
Use: adding dose is 0.3%～0.7% of lime stone quality.
Application result:
| ? | Solids content, % | Granularity (<=2 μ m), % | Viscosity, mPa/s | Desulfuration efficiency | Obvious scale formation |
| Before the use | 69.40 | 87.68 | 550 | 96.80 | 10 days |
| After the use | 71.0 | 90.0 | 200 | 99.0 | 14 days |
Explain that this dispersant can reduce the fineness and the viscosity of lime stone slurry.
Claims (4)
1. a lime stone slurry dispersant that is used for the limestone wet-process desulfurization is characterized in that it is formed by organic polycarboxylate salt dispersant and inorganic polyphosphate dispersant, and the shared mass fraction of each raw material is:
25～45 parts of organic polycarboxylate salt dispersants, 10～20 parts of inorganic polyphosphate dispersants.
2. a kind of lime stone slurry dispersant that is used for the limestone wet-process desulfurization according to claim 1; It is characterized in that; Said organic polycarboxylate salt dispersant is a Sodium Polyacrylate, any one in the sodium salt of acrylic acid and 2-acrylamido-2-methyl propane sulfonic acid sodium copolymer or two kinds of mixing by any proportioning.
3. a kind of lime stone slurry dispersant that is used for the limestone wet-process desulfurization according to claim 1 is characterized in that, said inorganic polyphosphate dispersant is any one or the two kinds of mixing by any proportioning in sodium phosphate trimer, the calgon.
4. a kind of preparation method who is used for the lime stone slurry dispersant of limestone wet-process desulfurization as claimed in claim 1 is characterized in that it comprises the steps:
1) choosing of raw material: the shared mass fraction of each raw material is: 25～45 parts of organic polycarboxylate salt dispersants, and 10～20 parts of inorganic polyphosphate dispersants are chosen organic polycarboxylate salt dispersant and inorganic polyphosphate dispersant;
2), obtain being used for the lime stone slurry dispersant of limestone wet-process desulfurization with organic polycarboxylate salt dispersant and inorganic polyphosphate dispersant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210242492 CN102773003B (en) | 2012-07-13 | 2012-07-13 | Limestone slurry dispersing agent for limestone wet desulfurization and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210242492 CN102773003B (en) | 2012-07-13 | 2012-07-13 | Limestone slurry dispersing agent for limestone wet desulfurization and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102773003A true CN102773003A (en) | 2012-11-14 |
| CN102773003B CN102773003B (en) | 2013-07-17 |
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| CN 201210242492 Expired - Fee Related CN102773003B (en) | 2012-07-13 | 2012-07-13 | Limestone slurry dispersing agent for limestone wet desulfurization and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107213775A (en) * | 2017-06-14 | 2017-09-29 | 昆明理工大学 | A kind of dispersion stabilizer for flotation tailing slurries desulfurization |
| CN108264247A (en) * | 2018-02-10 | 2018-07-10 | 广西华洋矿源材料有限公司 | A kind of production technology of active lime |
| CN110743352A (en) * | 2019-11-08 | 2020-02-04 | 浙江德创环保科技股份有限公司 | Semidry method waste incineration flue gas purification process |
| CN110813070A (en) * | 2019-11-15 | 2020-02-21 | 中国神华能源股份有限公司萨拉齐电厂 | Carbide slag modifier for desulfurization of circulating fluidized bed boiler, modified carbide slag and preparation method thereof |
| CN111434371A (en) * | 2019-01-14 | 2020-07-21 | 马志伟 | Desulfurizing and deslagging agent taking liquid form as raw material and preparation method |
| CN114307600A (en) * | 2021-12-22 | 2022-04-12 | 北京中德华信能源科技有限公司 | Desulfurization synergistic additive |
Families Citing this family (1)
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| CN106621782B (en) * | 2016-12-30 | 2019-04-16 | 深圳华明环保科技有限公司 | A kind of macromolecule denitrfying agent and preparation method thereof |
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| US5246679A (en) * | 1991-05-07 | 1993-09-21 | Electric Power Research Institute | Addition of organophosphonates for size control of wet calcium-based FGD byproduct solids under inhibited oxidation conditions |
| CN102031723A (en) * | 2010-11-16 | 2011-04-27 | 骏源特种纸（上海）有限公司 | Preparation method of high-performance wear-resistant paper |
| CN102091510A (en) * | 2010-12-17 | 2011-06-15 | 马鞍山市鸿伟环化有限公司 | Flue gas desulfurization synergist and using method thereof |
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2012
- 2012-07-13 CN CN 201210242492 patent/CN102773003B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5246679A (en) * | 1991-05-07 | 1993-09-21 | Electric Power Research Institute | Addition of organophosphonates for size control of wet calcium-based FGD byproduct solids under inhibited oxidation conditions |
| CN102031723A (en) * | 2010-11-16 | 2011-04-27 | 骏源特种纸（上海）有限公司 | Preparation method of high-performance wear-resistant paper |
| CN102091510A (en) * | 2010-12-17 | 2011-06-15 | 马鞍山市鸿伟环化有限公司 | Flue gas desulfurization synergist and using method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107213775A (en) * | 2017-06-14 | 2017-09-29 | 昆明理工大学 | A kind of dispersion stabilizer for flotation tailing slurries desulfurization |
| CN108264247A (en) * | 2018-02-10 | 2018-07-10 | 广西华洋矿源材料有限公司 | A kind of production technology of active lime |
| CN108264247B (en) * | 2018-02-10 | 2020-10-30 | 广西华洋矿源材料有限公司 | Production process of active lime |
| CN111434371A (en) * | 2019-01-14 | 2020-07-21 | 马志伟 | Desulfurizing and deslagging agent taking liquid form as raw material and preparation method |
| CN110743352A (en) * | 2019-11-08 | 2020-02-04 | 浙江德创环保科技股份有限公司 | Semidry method waste incineration flue gas purification process |
| CN110813070A (en) * | 2019-11-15 | 2020-02-21 | 中国神华能源股份有限公司萨拉齐电厂 | Carbide slag modifier for desulfurization of circulating fluidized bed boiler, modified carbide slag and preparation method thereof |
| CN114307600A (en) * | 2021-12-22 | 2022-04-12 | 北京中德华信能源科技有限公司 | Desulfurization synergistic additive |
| CN114307600B (en) * | 2021-12-22 | 2023-02-03 | 北京中德华信能源科技有限公司 | Desulfurization synergistic additive |
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