CN102773003B - 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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- CN102773003B CN102773003B CN 201210242492 CN201210242492A CN102773003B CN 102773003 B CN102773003 B CN 102773003B CN 201210242492 CN201210242492 CN 201210242492 CN 201210242492 A CN201210242492 A CN 201210242492A CN 102773003 B CN102773003 B CN 102773003B
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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 in coal-fired power plant and middle and small burn coal boiler, becomes the leading technology of desulfurization that coal-fired power plant adopts in the world today.This is because wet process of FGD efficient height, 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 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 made 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, i.e. the desulfurization wet-milling pulping system of often saying, and this method is relatively low owing to operating cost, 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 generates the quality of gypsum.
In wet process of FGD, fouling and obstruction usually take place in equipment.Equipment scaling and obstruction have become some absorption equipments
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 addresses from aspects such as technological design, device structure, operation controls then targetedly.
The fouling of desulphurization system and obstruction can cause absorption tower, oxidation trough, pipeline, nozzle, demister device, heat exchanger fouling and obstruction.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 suppress 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 control flue gas enters the fume amount that absorption system is brought into, and device structure will be made particular design, or selects absorption equipment less scaling and obstruction for use, and for example the thermopnore scrubbing tower is filled the less scaling and obstruction of scrubbing tower than fixing; Select smooth surface, uncorruptible material to make 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 into sulfuric acid and is attached on the inwall of 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 for the limestone wet-process desulfurization and preparation method thereof, this dispersant can reduce fineness and the viscosity of lime stone slurry.
To achieve these goals, the technical solution used in the present invention is: a kind of lime stone slurry dispersant 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.
Described 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.
Described inorganic polyphosphate dispersant is any one or any two kinds of mixing by any proportioning in sodium phosphate trimer, the calgon.
The preparation method of above-mentioned a kind of lime stone slurry dispersant for the 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) with organic polycarboxylate salt dispersant and inorganic polyphosphate dispersant, obtain the lime stone slurry dispersant for the limestone wet-process desulfurization.
The inorganic polyphosphate dispersant adsorption is on the surface of mud, make mud form charged electric double layer, according to the DELO theory, when charged particle is mutual close, electric double layer overlaps, 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 by 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 for the limestone wet-process desulfurization provided by the invention, can reduce 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 by 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 the following examples.Raw materials used all the purchase from market of the present invention obtains.
Embodiment 1
A kind of lime stone slurry dispersant 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 the lime stone slurry dispersant for the 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 |
Illustrate that this dispersant can reduce fineness and the viscosity of lime stone slurry.
Embodiment 2
A kind of lime stone slurry dispersant 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 the lime stone slurry dispersant for the 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 |
Illustrate that this dispersant can reduce fineness and the viscosity of lime stone slurry.
Embodiment 3
A kind of lime stone slurry dispersant 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 the lime stone slurry dispersant for the 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 |
Illustrate that this dispersant can reduce fineness and the viscosity of lime stone slurry.
Embodiment 4
A kind of lime stone slurry dispersant 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 the lime stone slurry dispersant for the 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 |
Illustrate that this dispersant can reduce fineness and the viscosity of lime stone slurry.
Embodiment 5
A kind of lime stone slurry dispersant 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 the lime stone slurry dispersant for the 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 |
Illustrate that this dispersant can reduce fineness and the viscosity of lime stone slurry.
Embodiment 6
A kind of lime stone slurry dispersant 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 the lime stone slurry dispersant for the 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 |
Illustrate that this dispersant can reduce fineness and the viscosity of lime stone slurry.
Claims (2)
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;
Described organic polycarboxylate salt dispersant is 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;
Described inorganic polyphosphate dispersant is any one or the two kinds of mixing by any proportioning in sodium phosphate trimer, the calgon.
2. the preparation method of a kind of lime stone slurry dispersant for the 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) with organic polycarboxylate salt dispersant and inorganic polyphosphate dispersant, obtain the lime stone slurry dispersant for the limestone wet-process desulfurization.
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|---|---|---|---|
| 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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| 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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| CN102773003B true CN102773003B (en) | 2013-07-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106621782A (en) * | 2016-12-30 | 2017-05-10 | 深圳市唯有新材料有限公司 | High-polymer denitration agent and preparation method thereof |
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| CN107213775A (en) * | 2017-06-14 | 2017-09-29 | 昆明理工大学 | A kind of dispersion stabilizer for flotation tailing slurries desulfurization |
| 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 |
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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 |
-
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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106621782A (en) * | 2016-12-30 | 2017-05-10 | 深圳市唯有新材料有限公司 | High-polymer denitration agent and preparation method thereof |
| 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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