CN114133966B - Method for preparing low-rank coal water slurry with good slurry property based on particle size distribution model - Google Patents
Method for preparing low-rank coal water slurry with good slurry property based on particle size distribution model Download PDFInfo
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- CN114133966B CN114133966B CN202111280264.3A CN202111280264A CN114133966B CN 114133966 B CN114133966 B CN 114133966B CN 202111280264 A CN202111280264 A CN 202111280264A CN 114133966 B CN114133966 B CN 114133966B
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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
Abstract
The invention discloses a method for preparing low-rank coal water slurry with good slurry property based on a particle size distribution model, which comprises the following steps: s1: coarse grinding is carried out on the coal raw material to obtain coal powder A; s2: taking the pulverized coal A in the step S1 as a raw material, and performing ball milling to obtain pulverized coal B; s3: constructing a particle size distribution model of the coal water slurry, and determining the proportion of the pulverized coal A to the pulverized coal B according to the particle size distribution model; s4: mixing the coal powder A and the coal powder B with the determined proportion in the step S3 with additives and water to prepare slurry, so as to obtain high-concentration coal water slurry; the coal water slurry comprises the following raw materials in parts by weight: 60-80 parts of composite pulverized coal, 25-35 parts of water and 0.1-0.2 part of additive; the composite pulverized coal consists of pulverized coal A and pulverized coal B according to the proportion of 2-5:1; the additive is one or more of naphthalene additives, lignin additives and dispersing agents GSH; the D10 particle size of the composite pulverized coal is 3-5 mu m, and the D50 particle size is 40-50 mu m. The water-coal-slurry prepared by the method has better slurry forming property, and the adopted particle size distribution model has smaller error with the actual measurement value.
Description
Technical Field
The invention relates to the technical field of preparation of coal water slurry, in particular to a method for preparing low-rank coal water slurry with good slurry property based on a particle size distribution model.
Background
The coal water slurry used as the oil-substituting fuel has the performances of high concentration, easy flow, good stability and the like, and has the problem of poor slurry forming property although the resources are rich for low-rank coal, and the main particle size distribution models Rosin-Rammler model, gaudin-Schuhmann model, alfred model and the like at present have larger errors when being applied to the low-rank coal, and cannot effectively obtain the coal water slurry with good slurry forming effect.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a method for preparing low-rank coal water slurry with good slurry property based on a particle size distribution model, the prepared coal water slurry has better slurry property, and the error between the adopted particle size distribution model and an actual measurement value is smaller.
The invention provides a method for preparing low-rank coal water slurry with good slurry property based on a particle size distribution model, which comprises the following steps:
s1: coarse grinding is carried out on the coal raw material to obtain coal powder A;
s2: taking the pulverized coal A in the step S1 as a raw material, and performing ball milling to obtain pulverized coal B;
s3: constructing a particle size distribution model of the coal water slurry, and determining the proportion of the pulverized coal A to the pulverized coal B according to the particle size distribution model;
s4: mixing the coal powder A and the coal powder B with the additive and water in the proportion determined in the step S3 to prepare slurry, and obtaining the high-concentration coal water slurry.
Preferably, the raw coal in the step S1 is low-rank coal.
Preferably, the low-rank coal is Shenmu coal.
Preferably, the D50 particle size of the pulverized coal A after coarse grinding in the step S1 is 64-84 mu m.
Preferably, the rotating speed during ball milling in the step S2 is 150-200r/min, and the ball milling time is 20-40min.
Preferably, the D50 particle size of the pulverized coal B after ball milling in the step S2 is 5-15 mu m.
Preferably, the particle size distribution model in S3 is:
wherein: x is a particle size; y is the particle content less than the particle size; k is the particle size at a particle content of K% (K takes values 0, 10, 20.. 80, 90); n is a model parameter; (K+10)% > x > K%.
Preferably, the coal water slurry in S4 comprises the following raw materials in parts by weight:
60-80 parts of composite pulverized coal, 25-35 parts of water and 0.1-0.2 part of additive;
wherein the composite pulverized coal is prepared from pulverized coal A and pulverized coal B according to a proportion of 2-5:1 proportion.
Preferably, the additive is one or more of naphthalene additive, lignin additive and dispersing agent GSH.
Preferably, the D10 particle size of the composite pulverized coal is 3-5 mu m, and the D50 particle size is 40-50 mu m.
The beneficial technical effects of the invention are as follows:
(1) According to the invention, the proportion of the coal powder A and the coal powder B is regulated by constructing a particle size distribution model of the coal water slurry, and when the D10 particle size of the composite coal powder is 3-5 mu m and the D50 particle size is 40-50 mu m, the obtained coal water slurry has the best slurry forming property.
(2) Compared with the existing Rosin-Rammler model, gaudin-Schuhmann model and Alfred model, the particle size distribution model constructed by the invention is closer to the actual measurement value, has smaller error, and can accurately obtain the particle size distribution of the high-concentration water coal slurry which is prepared from low-rank coal and has good slurry property.
Drawings
FIG. 1 is a graph showing a distribution of a particle size distribution model according to the present invention;
FIG. 2 is a graph of a distribution using a Rosin-Rammler model;
FIG. 3 is a graph of a distribution using a Gaudin-Schuhmann model;
FIG. 4 is a graph showing a distribution using Alfred model;
Detailed Description
The equipment for rough grinding is an SF-high-speed pulverizer (rod mill), and the equipment for ball milling is a vertical square planetary ball mill.
The determination of the coal dust granularity in the invention is performed by a BT-2003 laser granularity analyzer.
The viscosity of the coal water slurry was measured by an NXS-4C coal water slurry viscometer.
Example 1
The method for preparing the low-rank coal water slurry with good slurry property based on the particle size distribution model comprises the following steps:
s1: coarse grinding is carried out on the coal raw material to obtain coal powder A;
s2: taking the pulverized coal A in the step S1 as a raw material, and performing ball milling to obtain pulverized coal B;
s3: constructing a particle size distribution model of the coal water slurry, and determining the proportion of the pulverized coal A to the pulverized coal B according to the particle size distribution model;
s4: mixing the coal powder A and the coal powder B with the additive and water in the proportion determined in the step S3 to prepare slurry, and obtaining the high-concentration coal water slurry.
The coal raw material in S1 is low-order Shenmu coal.
The D50 particle size of the pulverized coal A after coarsely grinding in S1 is 79.02 μm.
And S2, the rotating speed of ball milling in the step of ball milling is 150r/min, and the ball milling time is 30min.
The D50 particle size of the pulverized coal B after ball milling in S2 is 13.58 mu m.
The particle size distribution model in S3 is:
wherein: x is a particle size; y is the particle content less than the particle size; k is the particle size at a particle content of K% (K takes values 0, 10, 20.. 80, 90); n is a model parameter; (K+10)% > x > K%.
The water-coal-slurry in the S4 comprises the following raw materials in parts by weight: 70 parts of composite pulverized coal, 30 parts of water and 0.15 part of additive; wherein the composite pulverized coal consists of pulverized coal A and pulverized coal B according to the proportion of 4:1.
The additive is dispersant GSH
The D10 particle size of the composite pulverized coal is 4.052 μm, and the D50 particle size is 47.36 μm.
The highest slurry concentration of the water-coal slurry prepared by the method is 63%, and the apparent viscosity is 1188.8 mPa.s.
Example 2
The method for preparing the low-rank coal water slurry with good slurry property based on the particle size distribution model comprises the following steps:
s1: coarse grinding is carried out on the coal raw material to obtain coal powder A;
s2: taking the pulverized coal A in the step S1 as a raw material, and performing ball milling to obtain pulverized coal B;
s3: constructing a particle size distribution model of the coal water slurry, and determining the proportion of the pulverized coal A to the pulverized coal B according to the particle size distribution model;
s4: mixing the coal powder A and the coal powder B with the additive and water in the proportion determined in the step S3 to prepare slurry, and obtaining the high-concentration coal water slurry.
The coal raw material in S1 is low-order Shenmu coal.
The D50 particle size of the pulverized coal A after coarsely grinding in S1 is 79.02 μm.
The ball milling speed in the step S2 is 200r/min, and the ball milling time is 30min.
The D50 particle size of the pulverized coal B after ball milling in S2 is 8.727 mu m.
The particle size distribution model in S3 is:
wherein: x is a particle size; y is the particle content less than the particle size; k is the particle size at a particle content of K% (K takes values 0, 10, 20.. 80, 90); n is a model parameter; (K+10)% > x > K%.
The water-coal-slurry in the S4 comprises the following raw materials in parts by weight: 70 parts of composite pulverized coal, 30 parts of water and 0.15 part of additive; wherein the composite pulverized coal consists of pulverized coal A and pulverized coal B according to the proportion of 4:1.
The additive is naphthalene additive.
The D10 particle size of the composite pulverized coal is 3.308 mu m, and the D50 particle size is 48.24 mu m.
The highest slurry concentration of the water-coal slurry prepared by the method is 64%, and the apparent viscosity is 1305.2 mPa.s.
Comparative example
The predicted particle size distribution and the actually measured particle size distribution of the particle size distribution model are compared with the particle size distribution model proposed by the invention by taking the particle size distribution model Rosin-Rammler, gaudin-Schuhmann, alfred which is most commonly used at present as a comparison example, and the results are shown in figures 1-4. As can be seen from FIGS. 1-4, the method provided by the invention is closer to the actual measurement value, and has smaller error, so that the particle size distribution of the high-concentration coal water slurry with good slurry property prepared from the low-rank coal can be accurately obtained.
Claims (6)
1. The method for preparing the low-rank coal water slurry with good slurry property based on the particle size distribution model is characterized by comprising the following steps:
s1: coarse grinding is carried out on the coal raw material to obtain coal powder A;
s2: taking the pulverized coal A in the step S1 as a raw material, and performing ball milling to obtain pulverized coal B;
s3: constructing a particle size distribution model of the coal water slurry, and determining the proportion of the pulverized coal A to the pulverized coal B according to the particle size distribution model;
s4: mixing the coal powder A and the coal powder B with the determined proportion in the step S3 with additives and water to prepare slurry, so as to obtain high-concentration coal water slurry;
the D50 particle size of the pulverized coal A after coarse grinding in the step S1 is 64-84 mu m;
the rotating speed of ball milling in the step S2 is 150-200r/min, and the ball milling time is 20-40min;
the D50 particle size of the pulverized coal B after ball milling in the step S2 is 5-15 mu m;
the particle size distribution model in S3 is:
wherein: x is a particle size; y is the particle content less than the particle size; k is the granularity when the content of the particles is K percent, and the values of K are 0, 10 and 20. n is a model parameter; (K+10)% > x > K%.
2. The method for preparing the low-rank coal water slurry with good slurry property based on the particle size distribution model according to claim 1, wherein the raw material of the coal in the step S1 is low-rank coal.
3. The method for preparing low-rank coal water slurry with good slurry property based on a particle size distribution model according to claim 2, wherein the low-rank coal is Shenmu coal.
4. The method for preparing the low-rank coal water slurry with good slurry property based on the particle size distribution model according to claim 1, wherein the coal water slurry in the step S4 comprises the following raw materials in parts by weight:
60-80 parts of composite pulverized coal, 25-35 parts of water and 0.1-0.2 part of additive;
wherein the composite pulverized coal consists of pulverized coal A and pulverized coal B according to the proportion of 2-5:1.
5. The method for preparing the low-rank coal water slurry with good slurry property based on the particle size distribution model according to claim 4, wherein the additive is one or more of naphthalene additives, lignin additives and dispersing agents GSH.
6. The method for preparing the low-rank coal water slurry with good slurry property based on the particle size distribution model according to claim 4, wherein the D10 particle size of the composite pulverized coal is 3-5 μm, and the D50 particle size is 40-50 μm.
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