CN104789287A - Coal water slurry prepared by adoption of interrupted particle size fractions and preparation method of coal water slurry - Google Patents
Coal water slurry prepared by adoption of interrupted particle size fractions and preparation method of coal water slurry Download PDFInfo
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Abstract
The invention discloses coal water slurry prepared by the adoption of interrupted particle size fractions and a preparation method of the coal water slurry. The coal water slurry is prepared from pulverized coal, an additive and water, wherein the pulverized coal is prepared from pulverized coal of which the particle size is critical particle diameter-2.5mm, and pulverized coal of which the particle diameter is equal to or smaller than 0.045mm, and the mass ratio of the two kinds of pulverized coal is 1:(0.1-1); the additive is lignosulfonate, humate or a condensation compound of naphthalene sulphonate formaldehyde; the mass proportion of the dry basis of the additive and the pulverized coal is (0.5-1):100; the mass percentage concentration of the coal water slurry is 55-70%. According to the preparation method disclosed by the invention, the distribution of particle sizes of the coal water slurry is controlled by the combination of the technique of raw-coal crushing and the technique of pulverized coal separation, so that the stacking efficiency is greatly improved, and compared with the first and second generation slurry preparing techniques, the concentration of coal slurry can be respectively raised by more than 6% and 3%; the preparation method is simple and can realize a continuous production technology, so that the continuous stable production demands of the preparation of the coal water slurry and coal chemical enterprises are satisfied; the preparation method disclosed by the invention can be applied to the field of fuels and gasified coal water slurry.
Description
Technical field
The present invention relates to a kind of high-concentration coal-water slurry and production method thereof, be specifically related to a kind ofly adopt the high-concentration coal-water slurry and preparation method thereof being interrupted grain size distribution, belong to COAL-WATER SLURRY TECHNOLOGY field.
Background technology
The coal based fluid fuel that coal water slurry is made up of coal, water and additive and gasified raw material, can be used for combustion power generation or the air feed of Industrial Boiler, kiln and station boiler, also can be used for gasification and produce the Chemicals such as synthetic ammonia, methyl alcohol, alkene, oil product and Sweet natural gas.According to incompletely statistics, by the end of the end of the year 2013, China's fuel coal water slurry consumption will have reached 3,000 ten thousand tons/year, and gasified coal water slurry consumption has broken through 100,000,000 tons/year.Along with large-scale promotion and the application of fuel and gasified coal water slurry, the problems that water coal slurry concentration is on the low side to be brought cause the concern of people gradually, also become the major technology bottleneck of restriction coal water slurry industry development.According to measuring and calculating, coal-water fluid concentration often improves 1 percentage point, and the calorific value of coal slurry can improve 60kcal/kg, can reduce 10kg/kNm than coal consumption
3, can 10Nm be reduced than oxygen consumption
3/ kNm
3, effective gas composition improves 0.8 percentage point, and burning and gasification efficiency significantly improve.Therefore, the pulping technique that exploitation is advanced, optimize coal water slurry grain size distribution, improve water coal slurry concentration, improving rheological and the stability of coal water slurry, is the important topic that solution is needed in coal water slurry industry development badly.
The grain size distribution of coal water slurry is the key factor affecting water coal slurry concentration, viscosity and rheological.But original coal water slurry preparation adopts single rod/ball mill pulping technique (first-generation pulping technique), once grind through rod/ball mill after feed coal fragmentation and can obtain finished product coal slurry, technical process is simple, cannot realize the optimization of coal water slurry grain size distribution, the deposition efficiency of coal particle and coal-water fluid concentration are generally on the low side.In recent years, along with the development of coal water slurry technology of preparing, s-generation classified grinding coal water slurry technology of preparing (publication number: CN 101173765 B) becomes the pulping technique of main flow gradually, this technology is by the organic assembling of rough grinding machine and atomizer mill, can realize the optimization of coal water slurry grain size distribution to a certain extent, coal-water fluid concentration can improve about 3 percentage points compared with original pulping technique.But this technology supplements the fine particle that median size is 20 μm in finished product coal water slurry, grain size distribution does not reach effective control, only slightly improve in the grain size intervals of < 45 μm, the increase rate of water coal slurry concentration is limited, is difficult to the needs meeting coal water slurry industry development.
Summary of the invention
The object of this invention is to provide and a kind ofly adopt the coal water slurry and preparation method thereof of being interrupted grain size distribution, the present invention is by controlling distribution and the content of each grain size intervals of coal dust, fine particle fully fills the hole that large coarse particles is formed, the closest packing state that formation efficiency is high, improve coal water slurry grain size distribution degree of optimization, significantly improve coal-water fluid concentration.
The coal water slurry adopting interruption grain size distribution provided by the invention, the coal water slurry that it is made up of coal dust, additive and water;
The granularity of described coal dust to be mass ratio be 1:0.1 ~ 1 is that the coal dust of critical grain size ~ 2.5mm forms with the coal dust of≤0.045mm;
Described additive is sulfonated lignin, humate or naphthalene sulfonic acidformaldehyde condensation product;
The ratio of the butt quality of described additive and described coal dust is 0.5 ~ 1:100;
Described water is solvent; The mass percentage concentration of described coal water slurry is 55 ~ 70%.
In the present invention, described coal dust can be made up of the coal of different rank.
Above-mentioned coal water slurry, described critical grain size (d
pc) be 0.1 ~ 0.5mm, specifically can adjust according to the difference of described coal dust coal.
In the present invention, described critical grain size (d
pc) refer to the coal dust after by fragmentation be separated selected by particle size values, namely with d
pcparticle diameter is that the coal dust (not comprising zero) of 0 ~ 2.5mm is separated into 0 ~ d by boundary's point
pcwith d
pc~ 2.5mm coal dust.
Present invention also offers the preparation method that above-mentioned employing is interrupted grain size distribution coal water slurry, comprise the steps:
(1) by feed coal through meticulous fragmentation, obtain the coal dust of particle diameter≤2.5mm;
(2) be separated according to the coal dust of critical grain size by described particle diameter≤2.5mm, obtaining particle diameter is critical grain size (d
pcthe coal dust of) ~ 2.5mm and be less than critical grain size (d
pc) coal dust;
(3) by following 1) or 2) method, namely obtain the coal water slurry of described interruption grain size distribution:
1) described particle diameter is less than critical grain size (d
pc) coal dust mix with water and described additive, then through extra-fine grinding, obtain the coal water slurry of particle diameter≤0.045mm; Be critical grain size (d by described coal water slurry and described particle diameter
pcthe coal dust mixing of) ~ 2.5mm;
2) described particle diameter is less than critical grain size (d
pc) coal dust carry out extra-fine grinding, obtaining the coal dust of particle diameter≤0.045mm, is then critical grain size (d with described particle diameter
pcthe mixing of the coal dust of) ~ 2.5mm, water and described additive.
The present invention adopts the high-concentration coal-water slurry being interrupted grain size distribution to be applied in fuel and gasified coal water slurry field.
The present invention has the following advantages:
1, the inventive method adopts the method that combines with coal dust isolation technique of raw coal fragmentation to realize the control of particle-size distribution of coal-water slurry, and deposition efficiency significantly improves, and coal-water fluid concentration can improve more than 6 and 3 percentage points compared with first and second pulping technique in generation respectively.
2, the fragmentation of original and existing pulping process, grinding link merge by the present invention, and namely raw coal can meet the size distribution requirements of coal water slurry through meticulous fragmentation, and save energy consumption higher ball/rod milling link, pulping energy consumption significantly reduces.
3, preparation method of the present invention is simple, is continous way production technique, meets continuous, the stably manufactured requirement of coal water slurry preparation and coal chemical industry enterprises.
Accompanying drawing explanation
Fig. 1 is the mass percent of two kinds of size-grade distribution in the high-concentration coal-water slurry of gap grading of the present invention.
Fig. 2 is the embodiment of the present invention 1 wet method preparation flow figure with slurry.
Fig. 3 is the embodiment of the present invention 2 dry method preparation flow figure with slurry.
Embodiment
The experimental technique used in following embodiment if no special instructions, is ordinary method.
Material used in following embodiment, reagent etc., if no special instructions, all can obtain from commercial channels.
Embodiment 1, employing are interrupted the preparation of the high-concentration coal-water slurry of grain size distribution
The feed coal of the present embodiment is the special low culm of Shenhua: the coal blending (hereinafter referred to as " Firing Shenhua Coal ") of the mixed 1# coal=1:1 of god, its full water M
t=16%, as received basis ash content A
ar=9%, as received basis volatile matter V
ar=23%.
According to the preparation flow shown in Fig. 2, it is as follows that the present invention utilizes this feed coal to prepare the process of high-concentration coal-water slurry:
(1) Firing Shenhua Coal is carried out the meticulous coal dust being crushed to particle diameter≤2.5mm;
(2) coal dust of≤2.5mm is separated, chooses critical grain size d
pc=200 μm, obtain coal dust that particle diameter is 200 μm ~ 2.5mm and the coal dust that particle diameter is less than 200 μm, mass percent of the two distribution as shown in Figure 1;
(3) it is for subsequent use that the particle diameter accounting for 50 ~ 70% of Firing Shenhua Coal total mass is that the coal dust of 200 μm ~ 2.5mm is delivered to coal dust surge bunker;
(4) coal dust that the particle diameter accounting for Firing Shenhua Coal total mass 30 ~ 50% is less than 200 μm mixes with the mass ratio of water by 2:3, adds by prepare coal slurry for subsequent use with the coal dust butt mass percent additive (sulfonated lignin) that is 0.5% simultaneously;
(5) coal slurry prepared by step (4) is carried out extra-fine grinding, ultra-fine coal slurry particle diameter≤45 μm of grinding out, are delivered to screened stock tank for subsequent use;
(6) be that the coal dust of 200 μm ~ 2.5mm is undertaken mixing through stirring by the mass percent set 68% with ultra-fine coal slurry prepared by step (5) by step (3) particle diameter, namely obtained coal slurry mass percent be 68% employing be interrupted the high-concentration coal-water slurry of grain size distribution.
The stability of high-concentration coal-water slurry of the present invention does not produce hard-caked sediment for being greater than 1 month, its rheological behavior 1050mPa.s (national standard≤1200mPa.s).
Embodiment 2, employing are interrupted the preparation of the high-concentration coal-water slurry of grain size distribution
The feed coal of the present embodiment is Xinjiang Red Hill coal (hereinafter referred to as " Red Hill coal "), its full water M
t=24%, A
ar=14%, V
ar=30%.
According to schema as shown in Figure 3, it is as follows that the present invention utilizes this feed coal to prepare the process of high-concentration coal-water slurry:
(1) Red Hill coal is carried out the meticulous coal dust being crushed to particle diameter≤2.5mm;
(2) coal dust of≤2.5mm is separated, chooses critical grain size d
pc=300 μm, obtain coal dust that particle diameter is 300 μm ~ 2.5mm and the coal dust that particle diameter is less than 300 μm;
(3) it is for subsequent use that the particle diameter accounting for 60 ~ 80% of Red Hill coal total mass is that the coal dust of 300 μm ~ 2.5mm is delivered to coal dust surge bunker;
(4) coal dust that the particle diameter accounting for 20 ~ 40% of Red Hill coal total mass is less than 300 μm carries out extra-fine grinding, prepares particle diameter≤45 μm microfine coal for subsequent use;
(5) be that the coal dust of 300 μm ~ 2.5mm and step (4) prepare≤45 μm of microfine coals, water by the mass percent mixing and stirring set by particle diameter prepared by step (3), add simultaneously by with coal dust butt mass percent be 0.5% additive (sulfonated lignin), can obtain coal slurry mass percent be 62% employing be interrupted the high-concentration coal-water slurry of grain size distribution.
The stability of high-concentration coal-water slurry of the present invention does not produce hard-caked sediment, rheological behavior 1160mPa.s (national standard≤1200mPa.s) for being greater than 1 month.
High-concentration coal-water slurry of the present invention can be used for fuel and gasified coal water slurry field.
Claims (4)
1. adopt the high-concentration coal-water slurry being interrupted grain size distribution, it is characterized in that: the coal water slurry that it is made up of coal dust, additive and water;
The granularity of described coal dust to be mass ratio be 1:0.1 ~ 1 is that the coal dust of critical grain size ~ 2.5mm and the coal dust of particle diameter≤0.045mm form;
Described additive is sulfonated lignin, humate or naphthalene sulfonic acidformaldehyde condensation product;
The ratio of the butt quality of described additive and described coal dust is 0.5 ~ 1:100;
Described water is solvent; The mass percentage concentration of described coal water slurry is 55 ~ 70%.
2. coal water slurry according to claim 1, is characterized in that: described critical grain size is 0.1 ~ 0.5mm.
3. adopt the preparation method of the high-concentration coal-water slurry being interrupted grain size distribution according to any one of claim 1 or 2, comprise the steps:
(1) by feed coal through meticulous fragmentation, obtain the coal dust of particle diameter≤2.5mm;
(2) be separated according to the coal dust of critical grain size by described particle diameter≤2.5mm, obtaining particle diameter is the coal dust of critical grain size ~ 2.5mm and the coal dust being less than critical grain size;
(3) by following 1) or 2) method, namely obtain the coal water slurry of described interruption grain size distribution:
1) coal dust described particle diameter being less than critical grain size mixes with water and described additive, then through extra-fine grinding, obtains the coal water slurry of particle diameter≤0.045mm; It is the coal dust mixing of critical grain size ~ 2.5mm by described coal water slurry and described particle diameter;
2) coal dust described particle diameter being less than critical grain size carries out extra-fine grinding, and obtaining particle diameter to be the≤coal dust of 0.045mm, is then that the coal dust of critical grain size ~ 2.5mm, water and described additive mix with described particle diameter.
4. according to any one of claim 1-3, adopt the application of high-concentration coal-water slurry in fuel and gasified coal water slurry field being interrupted grain size distribution.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105062587A (en) * | 2015-07-30 | 2015-11-18 | 煤炭科学技术研究院有限公司 | Low energy consumption grain controlled graded coal water slurry and preparation method thereof |
| CN109022074A (en) * | 2018-09-07 | 2018-12-18 | 煤科院节能技术有限公司 | A kind of water-coal-slurry and preparation method thereof using interruption grain size distribution |
| CN109880663A (en) * | 2019-03-27 | 2019-06-14 | 煤科院节能技术有限公司 | A kind of low energy consumption is interrupted the water-coal-slurry and preparation method thereof of grain size distribution completely |
| CN115851330A (en) * | 2022-12-23 | 2023-03-28 | 国能神东煤炭集团有限责任公司 | Preparation method of gasified coal water slurry |
Citations (3)
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| US4417902A (en) * | 1982-09-01 | 1983-11-29 | Texaco Inc. | Process for making and composition of low viscosity coal-water slurries |
| CN103305297A (en) * | 2013-06-08 | 2013-09-18 | 煤炭科学研究总院 | Gasified water-coal-slurry and preparation method thereof |
| CN103937568A (en) * | 2014-04-17 | 2014-07-23 | 中国五环工程有限公司 | Method for preparing high-concentration water-coal-slurry through coal with high oxygen content |
-
2015
- 2015-04-20 CN CN201510187702.XA patent/CN104789287B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4417902A (en) * | 1982-09-01 | 1983-11-29 | Texaco Inc. | Process for making and composition of low viscosity coal-water slurries |
| CN103305297A (en) * | 2013-06-08 | 2013-09-18 | 煤炭科学研究总院 | Gasified water-coal-slurry and preparation method thereof |
| CN103937568A (en) * | 2014-04-17 | 2014-07-23 | 中国五环工程有限公司 | Method for preparing high-concentration water-coal-slurry through coal with high oxygen content |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105062587A (en) * | 2015-07-30 | 2015-11-18 | 煤炭科学技术研究院有限公司 | Low energy consumption grain controlled graded coal water slurry and preparation method thereof |
| CN109022074A (en) * | 2018-09-07 | 2018-12-18 | 煤科院节能技术有限公司 | A kind of water-coal-slurry and preparation method thereof using interruption grain size distribution |
| CN109880663A (en) * | 2019-03-27 | 2019-06-14 | 煤科院节能技术有限公司 | A kind of low energy consumption is interrupted the water-coal-slurry and preparation method thereof of grain size distribution completely |
| CN109880663B (en) * | 2019-03-27 | 2021-03-05 | 煤科院节能技术有限公司 | Low-energy-consumption coal water slurry with complete discontinuous particle size distribution and preparation method thereof |
| CN115851330A (en) * | 2022-12-23 | 2023-03-28 | 国能神东煤炭集团有限责任公司 | Preparation method of gasified coal water slurry |
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Effective date of registration: 20160825 Address after: Beijing Caiyu Economic Development Zone 102606 Beijing city Daxing District Long Yu Caiyu Town Street No. 5 Applicant after: CHINA COAL RESEARCH INSTITUTE (CCRI) ENERGY SAVING TECHNOLOGY CO.,LTD. Address before: 100013 Heping Street, Heping Street, Beijing, Chaoyang District, No. 5 Applicant before: CCTEG CHINA COAL Research Institute |
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Address after: 102606 No.5, Yulong Street, Caiyu Economic Development Zone, Caiyu Town, Daxing District, Beijing Patentee after: Beijing Tiandi Sunac Technology Co.,Ltd. Address before: 102606 No.5, Yulong Street, Caiyu Economic Development Zone, Caiyu Town, Daxing District, Beijing Patentee before: CHINA COAL RESEARCH INSTITUTE (CCRI) ENERGY SAVING TECHNOLOGY CO.,LTD. |