CN109135853B - Method for preparing high-concentration coal water slurry by fine crushing and few grinding - Google Patents
Method for preparing high-concentration coal water slurry by fine crushing and few grinding Download PDFInfo
- Publication number
- CN109135853B CN109135853B CN201811018940.8A CN201811018940A CN109135853B CN 109135853 B CN109135853 B CN 109135853B CN 201811018940 A CN201811018940 A CN 201811018940A CN 109135853 B CN109135853 B CN 109135853B
- Authority
- CN
- China
- Prior art keywords
- slurry
- fine
- coal
- water
- mixing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- 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
- C10L2290/28—Cutting, disintegrating, shredding or grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Liquid Carbonaceous Fuels (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a method for preparing high-concentration coal water slurry by fine crushing and few grinding. The method comprises the following steps: (1) mixing and stirring the fine coal powder, water and the additive in a mixing and stirring tank to obtain slurry; (2) the slurry is finely ground by a wet method to obtain fine slurry A, and the fine slurry A is returned to the mixing and stirring tank to be mixed and stirred with the fine coal powder, the water and the additive to obtain finished coal water slurry; and diluting part of the finished coal water slurry by water, and then carrying out wet fine grinding to obtain fine slurry B, and circularly returning the fine slurry B to the mixing and stirring tank to carry out the mixing and stirring step. The method adopts fine crushing and less grinding to prepare the high-concentration water-coal-slurry, replaces the conventional single-rod/ball mill ore grinding pulping, can save 40-65% of pulping energy consumption, and not only obviously reduces the pulping cost, but also has high concentration, low viscosity, good fluidity and good stability of the water-coal-slurry.
Description
Technical Field
The invention relates to a method for preparing high-concentration coal water slurry, in particular to a method for preparing high-concentration coal water slurry by fine crushing and little grinding, belonging to the technical field of coal water slurry.
Background
The coal water slurry is a coal-based fluid raw material consisting of coal, water and additives, is used as a coal water slurry gasification raw material, and is widely used for producing chemical products such as synthetic ammonia, methanol, olefin, oil products, natural gas and the like. According to incomplete statistics, the consumption of gasified coal water slurry of China coal chemical enterprises breaks through 3 hundred million tons per year by 2017; coal water slurry is also a low-pollution coal-based fluid fuel, and is widely used for power station boilers, industrial boilers and industrial kilns for replacing oil, gas and coal for combustion.
At present, coal chemical enterprises mostly adopt a conventional single-rod/ball-milling pulping technology, raw material coal needs to be crushed, then is mixed with water and an additive and enters a rod/ball mill, coal slurry and a grinding medium (a steel rod or a steel ball) rotate along with a cylinder to be contacted and ground, the installed power of equipment is large, and the pulping energy consumption is high; the technological process is simple, the optimization of the grain size distribution of the coal water slurry cannot be realized, the concentration of the coal slurry is generally low, the specific coal consumption and the specific oxygen consumption are high, the effective gas component is low, and the gasification efficiency and the economy of the coal water slurry are seriously influenced. Therefore, it is urgently needed to develop an advanced pulping technology, reduce the pulping energy consumption, optimize the particle size grading of the coal water slurry, improve the concentration of the coal water slurry and improve the rheological property and the stability of the coal water slurry.
The coal for gasifying water-coal slurry mainly comprises long flame coal, non-sticky coal and weakly sticky coal, and the coal has large reserves, good reaction activity and low ash melting point and is an ideal raw material for gasifying the water-coal slurry. However, the coal has the characteristics of more oxygen-containing functional groups on the surface, high porosity, poor surface hydrophobicity and poor grindability. The technology for preparing gasified water-coal-slurry by utilizing the conventional single rod/ball mill mainly has the following problems:
(1) the pulping concentration is low. In the process of preparing the gasified coal water slurry by adopting a conventional single-rod mill, the concentration of the coal slurry is lower and is generally 58-61 wt% due to less adjusting means, unreasonable coal slurry particle size distribution and poor rheological property and stability of the coal slurry. Because the coal water slurry carries a large amount of redundant water to enter the gasification furnace, the gasification efficiency of the coal water slurry gasification is low, and the effective gas content is low, generally 79-80%;
(2) the pulping energy consumption is high. When the conventional single-rod mill is used for preparing the gasified coal water slurry, raw material coal is generally crushed to be less than 13mm and directly enters the rod mill for wet-type ore grinding and pulping, and the pulping production cost is high due to low ore grinding efficiency and high energy consumption.
Disclosure of Invention
In view of the problems in the prior pulping technology, the invention aims to provide a method for preparing high-concentration coal water slurry by fine crushing and few grinding, which can save 40-65% of pulping energy consumption, greatly reduce pulping cost, optimize particle size grading, improve stacking efficiency and coal water slurry concentration, and improve fluidity and stability.
The method for preparing high-concentration coal water slurry by fine crushing and few grinding comprises the following steps:
(1) mixing and stirring the fine coal powder, water and the additive in a mixing and stirring tank to obtain slurry;
(2) the slurry is finely ground by a wet method to obtain fine slurry A, and the fine slurry A is returned to the mixing and stirring tank to be mixed and stirred with the fine coal powder, the water and the additive to obtain finished coal water slurry;
and diluting part of the finished coal water slurry by water, and then carrying out wet fine grinding to obtain fine slurry B, and circularly returning the fine slurry B to the mixing and stirring tank to carry out the mixing and stirring step.
In the method, the fine coal powder has the granularity of less than or equal to 1.5mm and is obtained by finely crushing raw material coal, the granularity is preferably less than or equal to 0.7-1.0 mm when preparing gasified coal water slurry, and the granularity is preferably less than or equal to 0.2-0.5 mm when preparing fuel coal water slurry; the particle size distribution of the pulverized coal is controlled by a fine crushing pulverizing system in the actual production.
The additive is selected from any one or combination of at least two of lignosulfonate (such as sodium lignosulfonate, ammonium lignosulfonate and the like), naphthalene sulfonic acid formaldehyde condensate and humate (such as sodium humate, calcium humate and the like), and is specifically selected according to different coal types;
the water is any one or the combination of two of production water and waste liquid;
when the slurry is prepared in the step (1), adding the fine coal powder, water and the additive in proportion, and adjusting the feeding amount of the fine coal powder through a feeder in actual production; controlling the water adding amount through a flow regulating valve; the amount of additive was controlled by a metering pump.
In the method, the average particle size of the fine slurry A is 10-30 μm;
the average particle size of the fine slurry B is 10-30 μm.
In the above method, in the step (1), the mass ratio of the fine coal powder, the water and the additive is 1: 0.8-1.5: 0.003-0.008, wherein the mass of the fine coal powder is calculated by the dry basis mass of the fine coal powder, and is as follows: 0.9 to 1.0: 0.005;
the mass percentage concentration of the slurry is 40-50%.
In the above method, in the step (2), the mass ratio of the fine coal powder, the fine slurry a, the water and the additive is 1: 0.1-0.4: 0-0.2: 0.003-0.008, wherein the amount of water is not zero, and the mass of the fine coal powder is calculated by the dry basis mass thereof, such as 1: 0.3: 0.03 to 0.18: 0.006-0.008, 1: 0.3: 0.03: 0.008 or 1: 0.3: 0.18: 0.006;
the mass percentage concentration of the finished coal water slurry is more than or equal to 65 percent.
When the coal water slurry is prepared in the step (2), the pulping capacity can be adjusted within the range of 30-130%.
In the method, in the step (2), the coal water slurry subjected to the dilution step accounts for 10-40% of the total mass of the coal water slurry, such as 30%;
the mass ratio of the coal water slurry to the water is 1: 0.3 to 0.6, such as 1: 0.42-0.46, 1: 0.42 or 1: 0.46.
circularly carrying out stirring pulping in the mixing and stirring tank by using the fine pulp obtained by wet fine grinding in the step (2), namely repeatedly carrying out the mixing and stirring step, wherein the mixture ratio of the materials is the same as that of the fine pulp; the steps of pulping and preparing the fine pulp are completed in a stirring tank.
In the preparation method, the feeding flow of the wet-process fine grinding machine can be adjusted, and the feeding flow entering the wet-process fine grinding machine is controlled through the variable-frequency output of the feeding pump in the actual production; the concentration of the coal slurry entering the wet-process fine grinding mill can be adjusted, and the addition amount of dilution water is adjusted through a flow adjusting valve in actual production; the average particle size of the fine slurry can be adjusted by changing the slurry inlet flow of a wet fine mill, the particle size of a grinding medium and other means in actual production.
And (3) filtering impurities of the finished coal water slurry except the residual coal water slurry in the step (2), namely the high-concentration coal water slurry product, wherein the mass percentage concentration of the finished coal water slurry can reach 70 percent.
The high-concentration coal water slurry prepared by the method also belongs to the protection scope of the invention.
The invention has the following advantages:
1. the method adopts fine crushing and less grinding to prepare the high-concentration water-coal-slurry, replaces the conventional single-rod/ball mill ore grinding pulping, can save 40-65% of pulping energy consumption, not only obviously reduces the pulping cost, but also has high concentration, low viscosity, good fluidity and good stability of the water-coal-slurry;
2. the method for preparing the high-concentration water-coal-slurry by fine crushing and few grinding, which is provided by the invention, is a continuous production process and can meet the requirements of safe, stable and long-period operation of enterprises.
Drawings
FIG. 1 is a process flow diagram of the method for preparing high-concentration water-coal-slurry by fine crushing and little grinding.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1 preparation of high-concentration coal-Water slurry by Fine crushing and little grinding
The raw material coal is Xinjiang Heishan coal (hereinafter referred to as "Heishan coal"), and the raw material coal comprises 20% of total water Mt, 14% of Aar and 30% of Var.
According to the process flow of finely crushing and grinding to prepare the high-concentration water-coal-slurry in the invention in figure 1, the process of preparing the high-concentration water-coal-slurry by using the raw material coal is as follows:
(1) finely crushing the black mountain coal to prepare coal powder with the granularity less than or equal to 1.0mm to obtain fine coal powder;
(2) mixing fine coal powder, water and sodium lignosulfonate according to the proportion of 1: 0.9: adding the mixture into a mixing and stirring tank according to the mass ratio of 0.005 dry basis, and stirring to prepare slurry with the concentration of 45 wt%;
(3) feeding the slurry prepared in the step (2) into a wet-process fine grinding machine for grinding, preparing fine slurry with the average particle size of 18 mu m, and circularly returning the fine slurry into a stirring tank;
(4) mixing fine coal powder, fine slurry, water and an additive according to the proportion of 1: 0.3: 0.03: adding the mixture into a stirring tank according to the mass ratio of 0.006 on a dry basis, and mixing and stirring to prepare finished coal water slurry with the concentration of 67 wt%;
(5) and (3) mixing 30 percent of the total amount of the coal water slurry prepared in the step (4) according to the ratio of 1: adding water in a mass ratio of 0.46 for dilution, feeding the mixture into a wet-process fine grinding machine for grinding, preparing fine slurry with the average particle size of 18 mu m, and circularly returning the fine slurry into a stirring tank;
(6) and filtering impurities from the coal slurry except for the wet fine grinding to obtain the qualified coal water slurry with the concentration of 67 wt%.
In the preparation process, a fine-crushing less-grinding pulping technology is adopted to replace the conventional single-rod mill pulping technology in the comparative example, the pulping energy consumption of the gasified coal water slurry is 8-10 kwh, and compared with 20kwh in the comparative example 1, the pulping energy consumption can be reduced by 45%, so that the pulping cost is obviously reduced.
Example 2 preparation of high-concentration coal-water slurry by fine crushing and little grinding
The Shenfu coal is common long flame coal in northern Shaanxi region, and contains water for analysis 5.9%, water 12.8% and ash 19.9%.
According to the process flow of finely crushing and grinding to prepare the high-concentration water-coal-slurry in the invention in figure 1, the process of preparing the high-concentration water-coal-slurry by using the raw material coal is as follows:
(1) finely crushing Shenfu coal to prepare coal powder with the granularity less than or equal to 0.8 mm;
(2) mixing fine coal powder, water and ammonium lignosulfonate according to the proportion of 1: 1: adding the mixture into a mixing and stirring tank according to the mass ratio of 0.005 dry basis, and stirring to prepare slurry with the concentration of 45 wt%;
(3) feeding the slurry prepared in the step (2) into a wet-process fine grinding machine for grinding, preparing fine slurry with the average particle size of 20 mu m, and circularly returning the fine slurry into a stirring tank;
(4) mixing fine coal powder, fine slurry, water and an additive according to the proportion of 1: 0.3: 0.18: adding the mixture into a stirring tank according to the mass ratio of 0.006 on a dry basis, and stirring to prepare finished coal water slurry with the concentration of 66 wt%;
(5) and (3) mixing 30 percent of the total amount of the finished coal water slurry prepared in the step (4) according to the ratio of 1: adding water in a mass ratio of 0.42 for dilution, performing wet fine grinding to prepare fine slurry with the average particle size of 20 mu m, and circularly returning the fine slurry to the stirring tank;
(6) and filtering impurities from the coal slurry except the wet fine grinding to obtain the qualified coal water slurry with the concentration of 66 wt%.
The concentration of the obtained water-coal-slurry is 66 wt%, the viscosity is 789 mPa.s, the stability is good, and the water precipitation rate is 3.5% after standing for 48 hours.
The preparation process adopts a fine-breaking less-grinding pulping technology, the pulping energy consumption of the gasified coal water slurry is 8-10 kwh, and the pulping cost is obviously reduced.
Comparative examples 1,
The raw material coal is Shenhua special low-ash coal: shenmix 1# coal is 1: the coal blend (hereinafter referred to as "shenhua coal") of 1 had a total water Mt of 16%, a received basic ash Aar of 9%, and a received basic volatile matter Var of 23%.
The process for preparing the coal water slurry by using the raw material coal comprises the following steps:
(1) crushing Shenhua raw material coal until the granularity is less than or equal to 13 mm;
(2) mixing Shenhua coal and sodium lignosulfonate according to the mass ratio of dry basis of 100: mixing the coal slurry with water in a ratio of 0.3, sending the mixture to an inlet of a rod mill, grinding the mixture in a cylinder body of the mill by the impact and the rolling action between steel rods, and overflowing the coal slurry ground to a certain fineness from an outlet of the mill;
(3) and (3) shearing the coal water slurry prepared in the step (2) to obtain qualified coal water slurry, wherein the concentration of the coal slurry is 59%.
The preparation process of the coal water slurry adopts a single-rod mill, the energy consumption for preparing the fuel coal water slurry is 35kwh, and the energy consumption for preparing the gasified coal water slurry is 20 kwh.
Claims (1)
1. A method for preparing high-concentration coal water slurry by fine crushing and little grinding comprises the following steps:
(1) mixing and stirring the fine coal powder, water and the additive in a mixing and stirring tank to obtain slurry;
the granularity of the fine coal powder is less than or equal to 1.5 mm;
the additive is selected from any one or combination of at least two of lignosulfonate, naphthalene sulfonic acid formaldehyde condensate and humate;
the mass ratio of the fine coal powder, the water and the additive is 1: 0.8-1.5: 0.003-0.008, wherein the mass of the fine coal powder is calculated by the dry basis mass of the fine coal powder;
the mass percentage concentration of the slurry is 40-50%;
(2) the slurry is finely ground by a wet method to obtain fine slurry A, and the fine slurry A is returned to the mixing and stirring tank to be mixed and stirred with the fine coal powder, the water and the additive to obtain finished coal water slurry;
diluting part of the finished coal water slurry with water, and then carrying out wet fine grinding to obtain fine slurry B, and circularly returning the fine slurry B to the mixing and stirring tank to carry out the mixing and stirring step;
the average particle size of the fine slurry A is 10-30 μm;
the average particle size of the fine slurry B is 10-30 μm;
the mass ratio of the fine coal powder, the fine slurry A, the water and the additive is 1: 0.1-0.4: 0-0.2: 0.003-0.008, wherein the amount of water is not zero, and the mass of the fine coal powder is calculated by the dry basis mass of the fine coal powder;
the mass percentage concentration of the finished coal water slurry is more than or equal to 65 percent;
the finished coal water slurry subjected to the dilution step accounts for 10-40% of the total mass of the finished coal water slurry;
the mass ratio of the finished coal water slurry to the water is 1: 0.3 to 0.6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811018940.8A CN109135853B (en) | 2018-09-03 | 2018-09-03 | Method for preparing high-concentration coal water slurry by fine crushing and few grinding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811018940.8A CN109135853B (en) | 2018-09-03 | 2018-09-03 | Method for preparing high-concentration coal water slurry by fine crushing and few grinding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109135853A CN109135853A (en) | 2019-01-04 |
| CN109135853B true CN109135853B (en) | 2020-11-10 |
Family
ID=64826314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811018940.8A Active CN109135853B (en) | 2018-09-03 | 2018-09-03 | Method for preparing high-concentration coal water slurry by fine crushing and few grinding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109135853B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110628474B (en) * | 2019-10-14 | 2021-11-05 | 中煤科工清洁能源股份有限公司 | Method for preparing coal water slurry by adopting low-volatile raw material |
-
2018
- 2018-09-03 CN CN201811018940.8A patent/CN109135853B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109135853A (en) | 2019-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103305297B (en) | A kind of gasified coal water slurry and preparation method thereof | |
| CN101225334A (en) | Water coal coke slurry and preparation technology thereof | |
| CN103497791B (en) | A kind of Novel sludge coal-water slurry and preparation method thereof | |
| CN109880663B (en) | Low-energy-consumption coal water slurry with complete discontinuous particle size distribution and preparation method thereof | |
| CN100556996C (en) | Desulfurized hydrated coking slurry formula and preparation technology thereof | |
| CN109135853B (en) | Method for preparing high-concentration coal water slurry by fine crushing and few grinding | |
| CN102899111A (en) | Method for preparing gasified slurry from industrial effluent and coke powder | |
| CN101225335B (en) | Preparation method of water coke slurry for gasification | |
| CN114350420A (en) | Preparation method and application of low-cost coal slime-based coal water slurry | |
| CN105062587B (en) | Low energy consumption grain controlled graded coal water slurry and preparation method thereof | |
| CN106244267B (en) | A kind of clean combustion type water-coal-slurry and preparation method thereof | |
| CN104789287B (en) | A kind of water-coal-slurry using interruption grain size distribution and preparation method thereof | |
| CN105062567B (en) | The preparation method of water-gas | |
| CN103911195A (en) | Method for preparing high-concentration coal water slurry by using low rank coal | |
| CN106269085A (en) | A kind of method of ball mill concentration low-disintegration coal gasified coal water slurry concentration | |
| CN203513619U (en) | Grain size distribution device for pulping cyclic shunting of water coal slurry | |
| CN114958442A (en) | Coal water slurry fuel and preparation method thereof | |
| CN214765069U (en) | Production system of coal water slurry auxiliary agent | |
| CN101691926A (en) | Container moving type water-coal-slurry device and production process thereof | |
| CN109022074B (en) | Coal water slurry adopting discontinuous particle size distribution and preparation method thereof | |
| CN1152827C (en) | Process for treating waste mother liquid of H acid in dye factory | |
| CN106635208A (en) | Process for directly preparing coal water slurry from underflow of concentrator of coal preparation plant | |
| CN201496983U (en) | High-efficiency high-concentration high-rheology coal water slurry device | |
| CN112852513A (en) | Coal water slurry, preparation method thereof and preparation method of synthesis gas | |
| CN205205088U (en) | Production system of high concentration coal slurry is joined in marriage to discontinuous fraction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
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 |
|
| CP01 | Change in the name or title of a patent holder |