CN109880663A - A kind of low energy consumption is interrupted the water-coal-slurry and preparation method thereof of grain size distribution completely - Google Patents
A kind of low energy consumption is interrupted the water-coal-slurry and preparation method thereof of grain size distribution completely Download PDFInfo
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Abstract
The invention discloses the water-coal-slurry and preparation method thereof that a kind of low energy consumption is interrupted grain size distribution completely.The water-coal-slurry includes coal dust, additive and water；The coal dust includes that the bulky grain that middle granule materials are ground to the granule materials of average grain diameter≤45 μm and average grain diameter is 100~300 μm mixes composition with the small particles material that average grain diameter is 40~100 μm；The middle granule materials account for the 5~30% of the coal dust gross mass；The additive is selected from lignosulfonates, humate or naphthalene sulfonic acid-formaldehyde condensation product；The additive and the middle granule materials butt quality ratio are 0.1~1:100；The water-coal-slurry mass percentage concentration is 55~70%.Preparation method is to separate middle particle coal slurry from thick slurry using classification and a concentration technology twice after coal dust to be made to thick slurry, the middle particle coal slurry isolated after extra-fine grinding again in former thick slurry bulky grain and little particle coal slurry mix.Low energy consumption of the present invention is interrupted grain size distribution technique completely, and compared with traditional pulping technique, finished pulp concentration is substantially improved.
Description
Technical field
The present invention relates to the water-coal-slurry and preparation method thereof that a kind of low energy consumption is interrupted grain size distribution completely, belong to water-coal-slurry skill
Art field.
Background technique
Water-coal-slurry is the liquid mixing prepared by the coal, water and additive of different grain size distribution by means such as shearings
Object, can be used as Coal-based Liquid Fuel for station boiler, Industrial Boiler and Industrial Stoves generation oil, for gas, for coal combustion power generation or
Gas supply, also can be used as gasified raw material, be used for gasifier system synthesis gas, the chemical products such as production synthesis ammonia, methanol, alkene.With
The large-scale promotion and application of water-coal-slurry, the demand to water-coal-slurry quality is higher and higher, and wherein slurry concentration is water-coal-slurry production
A main performance assessment criteria in technique, slurry concentration is relatively low to reduce fuel coal water slurry calorific value, and gasified coal water slurry was applied
The relatively low meeting of slurry concentration in journey in gasification so that have a large amount of heat to take away reduction gasification efficiency by water latent heat.Measuring and calculating hair
Existing, coal-water fluid concentration is every to improve 1 percentage point, and 60kcl/kg can be improved in coal slurry calorific value, can reduce 10kg/kNm than coal consumption3, compare oxygen
Consumption can reduce 10Nm3/kNm3, effective 0.8 percentage point of the raising of gas ingredient, burning and gasification efficiency significantly improve.Therefore it develops first
Into pulping technique, improve water coal slurry concentration, promoted cool water mixture burning, gasification efficiency and economy be at this stage water-coal-slurry production
The important research direction of industry development.
Water-coal-slurry slurring technique is widely applied studies have shown that water-coal-slurry grain size distribution is in perfect pulping process
Influence the key factor of water coal slurry concentration, viscosity and rheological characteristic.The coal slurry industry of domestic overwhelming majority enterprise mostly uses
Single rod/ball mill pulping process (first generation pulping technique), the process flow is simple, but there are water-coal-slurry grain size distributions not to conform to
Reason, the water coal slurry concentration of preparation is generally relatively low, and water-coal-slurry fluidised form, the problems such as stability is poor.And it is increasingly becoming mainstream at this stage
Second generation classified grinding water-coal-slurry technology of preparing, be the combination by kibbling mill and atomizer mill, can be to a certain extent
The grain size distribution for optimizing water-coal-slurry makes slurry concentration obtain certain improve.But the technology be only supplemented in finished pulp it is a certain amount of
The duff grain that average grain diameter is 20 μm realizes the raising by a small margin in < 45 μm of particle size ranges, is not able to achieve perfect grain size distribution
Process, water-coal-slurry concentrate effect is limited, is unable to satisfy increasingly developed industry requirement.
What preceding two generations pulping technique utilized is continuous grading principle, meets continuous size accumulation theory, easy to operate, but grain
Degree distribution is continuous, and adjusting space is smaller, it is larger to adjust difficulty, therefore concentrate effect is limited.
Summary of the invention
The object of the present invention is to provide the water-coal-slurry and preparation method thereof that a kind of low energy consumption is interrupted grain size distribution completely, this hairs
It is bright so that grain size intervals distribution is not planned a successor by classification and extra-fine grinding, realize the complete interruption grain size distribution of water-coal-slurry particle,
Fine grained is sufficient filling with the hole of coarse granule formation, the high closest packing state of formation efficiency, while fine grain presence can
Coal slurry mobility is improved, coal-water fluid concentration greatly improves；Furthermore the atomizer mill material size controlled can effectively improve the work of atomizer mill
Make efficiency, reduces energy consumption.
A kind of low energy consumption provided by the invention is interrupted the water-coal-slurry of grain size distribution completely, which includes coal dust, addition
Agent and water；
The coal dust include middle granule materials be ground to average grain diameter≤45 μm granule materials and average grain diameter be 100~
300 μm of bulky grain mixes composition with the small particles material that average grain diameter is 40~100 μm；The middle granule materials account for the coal
The 5~30% of powder gross mass；
The additive is selected from lignosulfonates, humate or naphthalene sulfonic acid-formaldehyde condensation product；
The additive and the middle granule materials butt quality ratio can be 0.1~1:100, concretely 0.5:100；
The water-coal-slurry mass percentage concentration can be 55~70%.
In the present invention, the coal dust may include that middle granule materials are ground to the granule materials of average grain diameter≤45 μm and are averaged
Partial size can be able to be 40~70 μm for 200 μm, 100~200 μm, 200~300 μm or 150~250 μm of bulky grain and average grain diameter
Small particles material mix composition, the middle granule materials can specifically account for the coal dust gross mass 15%, 5~15%, 15~
30% or 10~25%；
Specific to be classified using 200 μm and 45 μm, it is large granular materials, average grain diameter that average grain diameter, which is greater than 200 μm,
It is small particles material less than 45 μm, is middle granule materials between 45~200 μm.
In the present invention, the middle granule materials of a part of particle size fraction of the present invention are taken out from raw material coal particle, are ground
Little particle is worn into, so that feed coal grain graininess range forms tomography, to realize complete gap grading, bulky grain accounts for coal
The range of powder gross mass can be different because of coal quality difference.
In above-mentioned water-coal-slurry, the lignosulfonates include ammonium lignosulphonate and/or sodium lignin sulfonate；
The humate includes sodium humate and/or humic acid magnesium.
In above-mentioned water-coal-slurry, the method for preparing the coal dust includes the following steps: to divide raw coal powder using classification technique
From for three kinds of bulky grain, middle particle and little particle different-grain diameter materials, then using ultra-fine grinding techniques by the middle particulate matter
It is mixed to get after abrasive lapping to average grain diameter≤45 μm with the bulky grain and small particles material.
In the present invention, the raw coal powder can be made of the coal of different rank.
The present invention also provides the preparation methods of above-mentioned water-coal-slurry, include the following steps:
(1) thick slurry is made in raw material coal dust and water mixed grinding；
(2) it is classified after being diluted with water thick slurry by first time, obtains partial size > d1Bulky grain coal slurry and partial size < d1Coal slurry；
d1It is 100~300 μm；
(3) partial size < d1Coal slurry is classified by second, obtains partial size d2~d1Middle particle coal slurry and partial size < d2Small
Beans slurry；d2It is 40~100 μm；
(4) partial size < d2Little particle coal slurry by concentration after with the partial size > d1The dehydration mixing of bulky grain coal slurry；
(5) the partial size d2~d1Middle particle coal slurry mixes after first time is concentrated with the additive, through extra-fine grinding
After to mean particle size≤45 μm with the partial size > d1Bulky grain and partial size < d2Little particle mixed material mixes to arrive institute
State the water-coal-slurry that low energy consumption is interrupted grain size distribution completely.
The present invention, d2Concretely 40~70 μm.
In the present invention, thick slurry is made in shown raw material coal dust, using bulky grain coal slurry, little particle coal slurry size range in
The grain size grading of specific value, remaining particle are middle particle coal slurry, then further grind middle particle coal slurry, then lead to
The ratio of particle coal slurry and bulky grain and little particle coal slurry in adjustment is crossed, to greatly improve the concentration of coal slurry.
The water-coal-slurry that low energy consumption of the present invention is interrupted grain size distribution completely is applied to prepare fuel and/or gasified coal water slurry
In field.
The invention has the following advantages that
1, the method for the present invention makes grain size intervals distribution not plan a successor, realizes water-coal-slurry by classification and ultra-fine grinding techniques
The complete interruption grain size distribution of particle, fine grained are sufficient filling with the hole of coarse granule formation, high tightly packed of formation efficiency
State, at the same it is fine grain in the presence of coal slurry mobility can be improved, and coal-water fluid concentration greatly improves.
2, the present invention controls atomizer mill material size by classification technique, can effectively improve atomizer mill working efficiency, reduces
Equipment consumption, energy consumption are greatly lowered.
3, preparation method of the present invention is simple, is continous way production technology, meets the company of water-coal-slurry preparation and coal chemical industry enterprises
Continuous, steady production requirement.
Detailed description of the invention
Fig. 1 is that water-coal-slurry of the present invention is interrupted grain size distribution schematic diagram completely.
Fig. 2 is that low energy consumption of the present invention is interrupted grain size distribution water-coal-slurry preparation flow figure completely.
Specific embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
Embodiment 1, low energy consumption are interrupted the preparation of grain size distribution fuel coal water slurry completely
The feed coal of the present embodiment is Firing Shenhua Coal, full water Mt=17%, As-received ash content Aar=10%, As-received is waved
Hair divides Var=25%.
According to preparation flow shown in FIG. 1, the present invention prepares interruption grain size distribution high concentration completely using the feed coal and fires
Expect that the process of water-coal-slurry is as follows:
(1) Firing Shenhua Coal is carried out rough and torn；
(2) broken rear coal dust is mixed into feeding rod mill with water and the thick slurry that mass percentage concentration is 52% is made, be delivered to
Supplied materials surge tank, and being diluted with water to mass percentage concentration is 20%；
(3) it is that 20% thick is starched by being pumped into level-one grading plant (0.200mm classification) by concentration, is classified as > 0.200mm
Material and < 0.200mm material, it is spare that < 0.200mm material enters surge tank；
(4) in surge tank < 0.200mm material by being pumped into second level grading plant (0.045mm classification), be classified as
0.200~0.045mm material and < 0.045mm material, it is spare that 0.200~0.045mm material enters surge tank, (0.200~
0.045mm material accounts for the 15% of Firing Shenhua Coal gross mass), < 0.045mm material is sent into enrichment facility；
(5) 0.200mm material enters dehydration dress<after the concentrated device concentration of 0.045mm material and in step (3)>
It sets and is dehydrated；
(6) in step (4) 0.200~0.045mm material by pump squeeze into enrichment facility carry out thickening after feed buffering
Tank is spare, feeds extra-fine grinding device with pump later, while being added by the additive for being 0.5% with material butt quality percentage
(lignosulfonates) carry out extra-fine grinding；
(7) material in the material after step (5) centrifugal dehydration and step (6) after extra-fine grinding feeds finished pulp
In be mixed, obtain coal slurry mass percentage concentration be 68.12% complete interruption grain size distribution water-coal-slurry.
The stability for the water-coal-slurry being prepared in the embodiment of the present invention 1 is not generate hard precipitating, rheology greater than 1 month
Property be 1050mPa.s (national standard fuel paste≤1500mPa.s).
Replace traditional technology in comparative example high using the coal water slurry process of interruption grain size distribution completely in the embodiment of the present invention 1
The stick of energy consumption ball mill, fuel coal water slurry pulping energy consumption be 22~25kwh, pulping energy consumption can drop compared with 35kwh in comparative example
Low 30%, slurrying concentration is that slurrying concentration can be improved 6~8% in 68.12%, with comparative example, and slurrying concentration is significantly promoted
Meanwhile realizing the reduction of pulping energy consumption.
Embodiment 2, low energy consumption are interrupted the preparation of grain size distribution gasified coal water slurry completely
The feed coal of the present embodiment is Xinjiang coal, full water Mt=22%, As-received ash content Aar=13%, As-received is waved
Hair divides Var=30%.
According to preparation flow shown in FIG. 1, the present invention prepares interruption grain size distribution high concentration gas completely using the feed coal
The process for changing water-coal-slurry is as follows:
(1) Xinjiang coal is carried out rough and torn；
(2) broken rear coal dust is mixed into feeding rod mill with water and the thick slurry that mass percentage concentration is 50% is made, be delivered to
Supplied materials surge tank, and being diluted with water to mass percentage concentration is 20%；
(3) it is that 20% thick is starched by being pumped into level-one grading plant (0.150mm classification) by concentration, is classified as > 0.150mm
Material and < 0.150mm material, it is spare that < 0.150mm material enters surge tank；
(4) in surge tank < 0.150mm material by being pumped into second level grading plant (0.045mm classification), be classified as
0.150~0.045mm material and < 0.045mm material, it is spare that 0.150~0.045mm material enters surge tank, (0.150~
0.045mm material accounts for the 12% of Xinjiang coal gross mass), < 0.045mm material is sent into enrichment facility；
(5) 0.150mm material enters dehydration dress<after the concentrated device concentration of 0.045mm material and in step (3)>
It sets and is dehydrated；
(6) by 0.150~0.045mm material in step (4) by pump squeeze into enrichment facility carry out thickening after feed it is slow
It is spare to rush tank, feeds extra-fine grinding device with pump later, while being added by the addition for being 0.5% with material butt quality percentage
Agent (lignosulfonates) carries out extra-fine grinding；
(7) by after step (5) centrifugal dehydration material and step (6) in material after extra-fine grinding feed finished product
It is mixed in slurry, obtains the complete interruption grain size distribution water-coal-slurry that coal slurry mass percentage concentration is 66.32%.
The water-coal-slurry being prepared in the embodiment of the present invention 2 rheological behavior 1020mPa.s (national standard gasification slurry≤
1300mPa.s)。
The coal water slurry process of the utilization being prepared in the embodiment of the present invention 2 interruption grain size distribution completely replaces in comparative example
The stick of traditional technology high energy consumption ball mill, gasified coal water slurry pulping energy consumption be 12~15kwh, with 20kwh in comparative example compared with system
Slurry energy consumption can reduce by 30%, and slurrying concentration is that slurrying concentration can be improved 6~8% in 66.32%, with comparative example, and slurrying concentration is big
While amplitude is promoted, the reduction of pulping energy consumption is realized.
Comparative example,
The feed coal of this comparative example is Firing Shenhua Coal, full water Mt=17%, As-received ash content Aar=10%, As-received is waved
Hair divides Var=25%.
It is as follows using above-mentioned raw materials coal preparation water-coal-slurry process:
(1) Firing Shenhua Coal is broken for partial size≤2.5mm coal dust；
(2) by step (1) coal dust and additive in the ratio and water blending transportation of butt quality ratio 100:0.3 to stick
Grinding machine grinds coal slurry with the effect of rolling using the impact between rod iron in rod mill, the water after being ground to certain fineness
Coal slurry is exported by rod mill to flow out；
It (3) is qualified water-coal-slurry after the clipped stir process of water-coal-slurry of step (2) preparation, coal-water fluid concentration is
60.21%.
Above-mentioned water-coal-slurry preparation process uses the rod mill of high energy consumption, and preparing fuel paste energy consumption is 35kwh, prepares gasified water
Coal slurry energy consumption is 20kwh.
Claims (5)
1. the water-coal-slurry that a kind of low energy consumption is interrupted grain size distribution completely, it is characterised in that: the water-coal-slurry include coal dust, additive and
Water；
The coal dust include middle granule materials be ground to average grain diameter≤45 μm granule materials and average grain diameter be 100~300 μ
The bulky grain of m mixes composition with the small particles material that average grain diameter is 40~100 μm；It is total that the middle granule materials account for the coal dust
The 5~30% of quality；
The additive is selected from lignosulfonates, humate or naphthalene sulfonic acid-formaldehyde condensation product；
The additive and the middle granule materials butt quality ratio are 0.1~1:100；
The water-coal-slurry mass percentage concentration is 55~70%.
2. water-coal-slurry according to claim 1, it is characterised in that: the lignosulfonates include ammonium lignosulphonate
And/or sodium lignin sulfonate；
The humate includes sodium humate and/or humic acid magnesium.
3. water-coal-slurry according to claim 1 or 2, it is characterised in that: the method for preparing the coal dust includes the following steps:
Raw coal powder is separated into three kinds of bulky grain, middle particle and little particle different-grain diameter materials using classification technique, then using ultra-fine
The middle granule materials are ground to behind average grain diameter≤45 μm and mix with the bulky grain and small particles material by grinding technique
It arrives.
4. the preparation method of water-coal-slurry of any of claims 1-3, includes the following steps:
(1) thick slurry is made in raw material coal dust and water mixed grinding；
(2) it is classified after being diluted with water thick slurry by first time, obtains partial size > d1Bulky grain coal slurry and partial size < d1Coal slurry；d1For
100~300 μm；
(3) partial size < d1Coal slurry is classified by second, obtains partial size d2~d1Middle particle coal slurry and partial size < d2Small-particle coal
Slurry；d2It is 40~100 μm；
(4) partial size < d2Little particle coal slurry by concentration after with the partial size > d1The dehydration mixing of bulky grain coal slurry；
(5) the partial size d2~d1Middle particle coal slurry by first time be concentrated after and the additive mixing, through extra-fine grinding to
Grain average grain diameter≤45 μm after with the partial size > d1Bulky grain and partial size < d2The mixing of little particle mixed material is described low to get arriving
Energy consumption is interrupted the water-coal-slurry of grain size distribution completely.
5. water-coal-slurry of any of claims 1-3 is applied in preparing fuel and/or gasified coal water slurry field.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111605117A (en) * | 2019-12-23 | 2020-09-01 | 东莞市松裕塑胶皮具制品有限公司 | Process for molding E-TPU mobile phone protective shell through secondary compression molding |
| CN113560012A (en) * | 2021-06-29 | 2021-10-29 | 江苏恒丰能环科技股份有限公司 | Method for changing pulp particle size distribution of rod mill |
| CN115058267A (en) * | 2022-07-27 | 2022-09-16 | 神华准能资源综合开发有限公司 | Coal water slurry concentration method and coal water slurry concentration device |
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Address after: 100013 No. 5 Youth Road, Chaoyang District, Beijing, Hepingli Patentee after: Beijing Tiandi Sunac Technology Co.,Ltd. Patentee after: CCTEG CHINA COAL Research Institute Address before: 100013 No. 5 Youth Road, Chaoyang District, Beijing, Hepingli Patentee before: CHINA COAL RESEARCH INSTITUTE (CCRI) ENERGY SAVING TECHNOLOGY CO.,LTD. Patentee before: CCTEG CHINA COAL Research Institute |