CN106929115B - Cationic asphalt emulsion coated modified low-rank coal and method for preparing coal water slurry by using same - Google Patents
Cationic asphalt emulsion coated modified low-rank coal and method for preparing coal water slurry by using same Download PDFInfo
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- CN106929115B CN106929115B CN201710200082.8A CN201710200082A CN106929115B CN 106929115 B CN106929115 B CN 106929115B CN 201710200082 A CN201710200082 A CN 201710200082A CN 106929115 B CN106929115 B CN 106929115B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/08—Drying or removing water
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/18—Spraying or sprinkling
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/24—Mixing, stirring of fuel components
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/36—Applying radiation such as microwave, IR, UV
Abstract
A method for coating modified low-rank coal with cationic asphalt emulsion comprises the steps of firstly removing internal water from the low-rank coal under the action of microwaves until the mass of coal powder is constant, then sealing pores and coating and modifying the surface of the coal powder by using cationic emulsified asphalt as a surface modifier, wherein the obtained modified low-rank coal can be used for preparing coal water slurry.
Description
Technical Field
The invention belongs to the technical field of lignite application, relates to surface modification of lignite, and particularly relates to cationic asphalt emulsion coated modified low-rank coal and a method for preparing coal water slurry by using the same.
Background
Coal water slurry is a novel technology for replacing oil with coal, which is developed in the seventy-eight years of the last century due to the shortage of oil. The coal water slurry is a novel coal-based clean environment-friendly fuel, is a solid-liquid two-phase suspension dispersion system prepared by processing about 60-70% of coal, 30-40% of water and a small amount of additive through a certain process, and has the same fluidity and stability as oil; can pump, atomize and stably catch fire and burn; its calorific value corresponds to approximately half of that of fuel. The development of the coal water slurry technology in China has important significance.
The coal water slurry with industrial application value has high concentration, low viscosity, good fluidity and stability. The problem of preparing high-concentration coal water slurry by using low-rank coal at present is that the rheological property of coal particles is influenced due to high hydrophilicity of the coal particles caused by high porosity and internal water content, rich oxygen-containing functional groups, high content of surface hydrophilic groups such as carboxyl, hydroxyl and carbonyl and the like.
Disclosure of Invention
In order to overcome the defects of high water content in low-rank coal and easy reabsorption of water after dehydration and quality improvement in the prior art, the invention aims to provide a modified low-rank coal coated with cationic asphalt emulsion and a method for preparing coal water slurry, wherein the water content is reduced by using a microwave technology on porosity and internal water content; because the carboxyl and other oxygen-containing groups on the surface of the low-rank coal and the inorganic mineral substances on the surface of the coal particles, such as carbonate and silicate, are electronegative, the invention selects the cationic asphalt emulsion with electropositivity, good film-forming property and strong covering power to coat and modify the low-rank coal particles, plugs the pores on the surfaces of the coal particles, prevents the upgraded and dried coal particles from adsorbing water again, reduces the reabsorption of the coal particles on free water, and improves the hydrophobicity of the coal surface, so that the low-rank coal difficult to pulp presents strong hydrophobicity similar to the surface of high-rank coal, improves the fluidity of the coal water slurry and the slurry stability thereof, enables the dehydrated coal particles to have the characteristics of greatly reduced porosity, improved hydrophobicity, low reabsorption rate of the coal powder on the free water, small using amount, uniform covering, high efficiency, economy and the like, and simultaneously can use common naphthalenesulfonate and lignosulfonate as a dispersant, thereby becoming an effective method for improving the preparation of high-concentration coal water slurry by low-rank coal.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for coating modified low-rank coal with cationic asphalt emulsion comprises the steps of firstly removing internal water from the low-rank coal under the action of microwaves until the mass of coal powder is constant, and then sealing holes and coating the surface of the coal powder by using the cationic asphalt emulsion as a surface modifier to realize modification of the low-rank coal.
The cationic asphalt emulsion is obtained by the following steps: respectively putting 1g of Span60, 3g of Tween60 and 0.2g of hexadecyl trimethyl ammonium chloride into a beaker, adding 200mL of water, uniformly stirring to obtain an emulsifier aqueous solution, and then heating the emulsifier aqueous solution to 70 ℃; weighing 50g of asphalt, and heating to 140 ℃; starting the colloid mill, injecting the hot water solution of the emulsifier into the colloid mill, slowly pouring the hot asphalt into the colloid mill for emulsification, stopping the colloid mill after about 10min, and cooling to room temperature to obtain the cationic asphalt emulsion.
The hole sealing and the surface coating are realized by a spraying method.
The addition amount of the cationic asphalt emulsion is 0.5-2.0% of the dry weight of the low-rank coal.
The obtained modified low-rank coal can be used for preparing coal water slurry: adding a dispersing agent and water into the modified low-rank coal, and stirring to prepare the modified low-rank coal.
The dispersant is naphthalene sulfonate or lignin salt, and the addition amount of the dispersant is 0.3 percent of the weight of dry coal.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method for improving the quality by using the microwaves is used for economically, environmentally, safely and efficiently desorbing the water in the low-rank coal and carrying out surface modification on the low-rank coal in a surface coating mode, so that the coal particles in the coal water slurry are prevented from reabsorbing the free water, the slurry forming performance of the coal water slurry is improved, and the traditional concept of improving the slurry forming performance by researching a dispersing agent is broken through.
(2) The modifier adopts the cationic asphalt emulsion, so that the interaction mode of the cationic asphalt emulsion and the surface of coal is changed from single hydrogen bond adsorption into double functions of hydrogen bond adsorption and electrostatic adsorption. Therefore, the modifier has better adsorption effect, less consumption and simple method, and effectively improves the hydrophobicity and pore structure of the surface of the coal particles, thereby achieving the effects of reducing the apparent viscosity of the coal water slurry and preventing the reabsorption of free water.
Detailed Description
The following examples are provided to explain embodiments of the present invention in detail.
Example 1
Removing internal water of the coal dust under the microwave condition until the mass of the coal dust is kept unchanged, coating and modifying the coal dust by using a small-sized spray agent by using a cationic asphalt emulsion of which the mass is 0.5 percent of that of the coal dust in an atomizing mode, placing the modified coal dust in a drying oven at 105 ℃ to remove water, and sealing and storing.
Example 2
Removing internal water of the coal dust under the microwave condition until the mass of the coal dust is kept unchanged, coating and modifying the coal dust by using a small-sized spray agent through a cationic asphalt emulsion with the mass of 1% of the coal dust in an atomizing mode, placing the modified coal dust in a drying oven with the temperature of 105 ℃ to remove water, and sealing and storing.
Example 3
Removing internal water of the coal dust under the microwave condition until the mass of the coal dust is kept unchanged, coating and modifying the coal dust by respectively using a small-sized spray agent to coat and modify cationic asphalt emulsion accounting for 1.5 percent of the mass of the coal dust in an atomizing mode, placing the modified coal dust in a drying oven at 105 ℃ to remove water, and sealing and storing.
Example 4
Removing internal water of the coal dust under the microwave condition until the mass of the coal dust is kept unchanged, coating and modifying the coal dust by using a small-sized spray agent in an atomizing mode by using a cationic asphalt emulsion of which the mass is 2.0% of that of the coal dust, placing the modified coal dust in a drying oven at 105 ℃ to remove water, and sealing and storing.
And (3) testing the application effect:
selecting inner Mongolia lignite as a research object, and uniformly stirring the inner Mongolia lignite through crushing, ball milling, screening and grading to prepare coal water slurry (mass fraction is 57%) with the same concentration, wherein the coal slurry is prepared by the following steps: 8% of 0.840-0.420 mm, 42% of 0.420-0.124 mm, 7% of 0.124-0.074 mm, 8% of 0.074-0.063 mm and 35% of less than 0.063 mm. The dispersant is naphthalene sulfonate, the addition amount is 0.3% (accounting for the dry coal wt%), and the results of the slurry property test of the coal powder with the surface hydrophobically modified by the invention are shown in the following table 1, and the apparent viscosity of the coal water slurry of the coal powder modified by the cationic asphalt emulsion is changed after 0h, 6h, 12 h, 24h and 48h in the table 1.
Table 1: comparison of the pulp formation Properties of the products of the examples
| Performance index (mPa. s) | 0h | 6h | 12h | 24h | 48h |
| Microwave quality improvement comparison sample | 817 | 1198 | 1572 | 2022 | 2807 |
| 0.5% cationic asphalt emulsion | 612 | 862 | 1008 | 1102 | 1785 |
| 1.0% cationic asphalt emulsion | 592 | 854 | 956 | 1035 | 1356 |
| 1.5% cationic asphalt emulsion | 556 | 712 | 852 | 924 | 1124 |
| 2.0% cationic asphalt emulsion | 502 | 668 | 715 | 734 | 824 |
Claims (6)
1. A method for coating modified low-rank coal with cationic asphalt emulsion comprises the steps of firstly removing internal water from the low-rank coal under the action of microwaves until the mass of coal powder is constant, and then sealing holes and coating the surface of the coal powder by using the cationic asphalt emulsion as a surface modifier to realize low-rank coal modification, wherein the cationic asphalt emulsion is obtained by the following method: respectively putting 1g of Span60, 3g of Tween60 and 0.2g of hexadecyl trimethyl ammonium chloride into a beaker, adding 200mL of water, uniformly stirring to obtain an emulsifier aqueous solution, and then heating the emulsifier aqueous solution to 70 ℃; weighing 50g of asphalt, and heating to 140 ℃; starting the colloid mill, injecting the hot water solution of the emulsifier into the colloid mill, slowly pouring the hot asphalt into the colloid mill for emulsification, stopping the colloid mill after 10min, and cooling to room temperature to obtain the cationic asphalt emulsion.
2. The method for coating modified low-rank coal with the cationic asphalt emulsion according to claim 1, wherein the surface coating is realized by a spraying method.
3. The method for coating modified low-rank coal with the cationic asphalt emulsion according to claim 1, wherein the cationic asphalt emulsion is added in an amount of 0.5-2.0% by dry weight of the low-rank coal.
4. Use of a modified low-rank coal obtained by the method of coating the modified low-rank coal with the cationic asphalt emulsion of claim 1 to prepare a coal-water slurry.
5. The use of claim 4, wherein the modified low-rank coal is added with a dispersant and water and stirred to prepare the coal water slurry.
6. The use according to claim 5, wherein the dispersant is a naphthalene sulfonate or lignin salt, added in an amount of 0.3% by weight of the dry coal.
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| CN201710200082.8A CN106929115B (en) | 2017-03-30 | 2017-03-30 | Cationic asphalt emulsion coated modified low-rank coal and method for preparing coal water slurry by using same |
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| CN106929115B true CN106929115B (en) | 2020-02-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106367144A (en) * | 2016-08-31 | 2017-02-01 | 陕西延长石油（集团）有限责任公司 | Method for modification and resource utilization of coal-oil coprocessing residues |
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| JPS56103294A (en) * | 1980-01-23 | 1981-08-18 | Nippon Kemutetsuku Consulting Kk | Coal-containing slurry composition |
| CN1020468C (en) * | 1987-04-23 | 1993-05-05 | 中国科学院感光化学研究所 | High concentration water-coal pulp additive |
| US4969928A (en) * | 1989-03-03 | 1990-11-13 | The United States Of America As Represented By The United States Department Of Energy | Combined method for simultaneously dewatering and reconstituting finely divided carbonaceous material |
| CN100575462C (en) * | 2006-03-01 | 2009-12-30 | 陕西升基利科技有限公司 | The production method of instant water-gas slurry powder |
| CN101508848B (en) * | 2009-03-18 | 2011-10-12 | 广州路翔股份有限公司 | Modified emulsified asphalt, production method and CA mortar comprising the emulsified asphalt |
| CN101921640A (en) * | 2009-06-15 | 2010-12-22 | 贵州大学 | Biomass/coal environment friendly coal water slurry |
| CN102434343B (en) * | 2011-09-30 | 2013-06-12 | 辽宁科技大学 | Oxygen-enriched combustion method of lignite methyl alcohol coal slurry fuel material in compression-type internal combustion engine |
| CN104927959A (en) * | 2015-05-05 | 2015-09-23 | 浙江大学 | Preparation method and using method of adhesion agent for manufacturing waterproof and wear-resistant briquette coal |
| CN104962331A (en) * | 2015-07-03 | 2015-10-07 | 中国东方电气集团有限公司 | Method for preparing coal water slurry from low-rank coal |
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| CN106367144A (en) * | 2016-08-31 | 2017-02-01 | 陕西延长石油（集团）有限责任公司 | Method for modification and resource utilization of coal-oil coprocessing residues |
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| 微波辐照对褐煤表面含氧官能团及孔隙结构的影响;任阳光等;《微波辐照对褐煤表面含氧官能团及孔隙结构的影响》;煤炭工程;20160229;第48卷(第2期);第123-126页 * |
| 氧化煤对CTAB的吸附性能及表面润湿性改性;郝盼等;《氧化煤对CTAB的吸附性能及表面润湿性改性》;煤炭转化;20150731;第38卷(第3期);第16-21页 * |
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