CN85106713A

CN85106713A - The preparation technology of high-concentration coal-water slurry

Info

Publication number: CN85106713A
Application number: CN 85106713
Authority: CN
Inventors: 江龙; 李兴长
Original assignee: Institute of Photographic Chemistry of CAS
Current assignee: Institute of Photographic Chemistry of CAS
Priority date: 1985-09-06
Filing date: 1985-09-06
Publication date: 1986-11-26
Also published as: CN85106713B

Abstract

The invention belongs to a kind of preparation novel liquid fuel---the technology of coal water slurry.Be about to coal dust broken back adding additive and water and make the high density coal slurry.This coal slurry can be used for Industrial Boiler and Industrial Stoves burning, can carry at a distance.The feature of this method is with the dry grinding method coal to be processed into coarse particles below 40 orders; grind the fine particle of particle size below 200 orders with wet milling process; then that particle diameter is the different wet two kinds of particles of doing mix; after the suitable position of technical process adds additive, can make concentration in the coal water slurry more than 65%.

Description

The preparation technology of high-concentration coal-water slurry

The invention belongs to a kind of method for preparing New-type fuel one coal water slurry, promptly prepare a kind of can pipeline transportation and incendiary high-concentration coal water mixture.

In the preparation coal water slurry, preparation technology has a very important role, and the quality of pulping process affects the final preparation concentration of coal slurry and the energy consumption and the expense of slurrying.

In order to prepare the coal water slurry of high density, many reports about pulping process were arranged once.For example: U.S.4.406,663 patents suggestions is made concentration earlier less than 60% coal slurry, is concentrated to 65% then, and doping is made concentration at last greater than 60% slurry again.And for example: 1985 8 volumes of world inventions, 1 phase report, the method for application size particle collocation prepares coal slurry, can make the coal water slurry of high density.Utilizations such as Japan Watanabe are repeatedly ground and are prepared high-concentration coal-water slurry.

But major part all contains this process of concentrating in these methods, has increased the expense and the energy consumption of slurrying, uses the dry grinding method in the method that has, and causes serious dust pollution and because the inflammable and explosive problem that produces of coal dust.Employed on the other hand grinding plant efficient is low, and energy consumption is big.

Do wet grinding in this law and be used, promptly make coarse particles with dry grinding, wet grinding makes fine particle, and the coal dust fork-like farm tool used in ancient China that utilizes dry method to make improves wet method and makes the concentration of slurry, thereby has saved this process of concentrating.Prepare the danger that the coal dust fine particle can be saved plant area greatly and eliminate dust pollution and catch fire with wet grinding in addition, improve the condition of field worker operation.

In the fine grinding process and since required grind particle thinner, the efficient of different grinding machines and energy consumption difference are very big.So the efficiency of selection height, the grinding machine that energy consumption is low has crucial meaning.Very emphasize to use the importance of high-level efficiency grinding machine among the present invention, therefore adopted high efficiency vibromill and other high-efficient grinding equipments, can improve mill efficiency greatly and cut down the consumption of energy.

Stirring behind the adding additive is very important to the final flowing property of slurry, therefore must abundant and repeatedly stirring after preparation.

Content of the present invention is: using twin rollers, ball mill or other size reduction machineries commonly used that the coal dry type is crushed to below 40 orders, make its particle size range between 40 order to 160 orders, is to be the A component.Use vibration mill, ball milling or other wet-milling equipment are broken to coal dust below 200 orders, and its fine particle can reach 1 micron, is to be the B component.Then A is added among the B, can be according to the weight ratio of the different A of coal and B from 1: 9 to 9: 1.

The adding position of additive can join in the grinding machine when grinding, and also can add when A mixes with B, can once add, and also can gradation add.The kind of additive is a lot, and widely used have a polyethylene oxide derivatives (EP109740; JP8418791).Soap class (US, 4,435306), poly-second=imines (JP84215490), sulfonated lignin (US, 4,282,006) etc.

After making slurry, use a high speed agitator, slurry is fully stirred and make the further homogenize of slurry by two mixing tanks, can be made into high-concentration coal-water slurry at last, its concentration reaches as high as 79% more than 65%.

The pulping process route is as follows:

High-concentration coal-water slurry preparation technology schema.

For character of the present invention and advantage are described, be exemplified below.But the present invention is not limited to these examples.

Embodiment one.

Get 70 kilograms in coal, its ash is 10%, fugitive constituent 30%, pulverize through jaw crusher, grind through twin rollers then, the gained coal dust is sieved through 60 purposes, obtain particle less than 60 purpose coal dusts, wherein 70% promptly 49 kilograms no longer grind, with wherein 30% promptly 21 kilograms send in the vibration mill, add 30 kilograms of grindings of water.The particle size that always is ground to gained is all less than 200 orders.Two kinds of particles of thickness are mixed mutually, add entry and additive simultaneously, fully stir.The coal water slurry that obtains at last, concentration are 70%, and viscosity is 800 centipoises (shear rates 5 seconds ^-1), leave standstill and do not find precipitation in four months.

Embodiment two.

Get 100 kilograms in coal, ash is 5%, about fugitive constituent 30%, pulverize through rod hammer machine, can get particle less than 40 purpose coal dusts, with wherein 50 parts of reservations as the coarse particles component, send in the vibration mill for all the other 50 parts, add additive and water, through grinding, the particle size that always is ground to gained is all less than 300 orders.Two kinds of particles of thickness are mixed mutually, add second additive and water, after fully stirring, be made into 60% coal water slurry, viscosity is 1000 centipoises (shear rates 5 seconds ^-1), left standstill four months, do not find precipitation.

Claims

1, a kind of technology for preparing high-concentration coal-water slurry, it is characterized in that having adopted dry grinding and wet grinding bonded technology, draw the coal dust of two kinds of size distribution, these two kinds of coal dusts are mixed to be incorporated in fully stir after suitable position adds additive, can make concentration greater than 60% coal water slurry.

2, by the said dry grinding of claim 1, it is characterized in that using general Dry Crushing such as twin rollers, ball milling, rod milling that particle is ground between the 40-160 order.

3, by the said wet grinding of claim 1, it is characterized in that using dynamical wet-milling equipment, as vibration mill.And the high-efficient wet-type ball mill etc., particle is ground to below 200 orders, the smallest particles diameter can reach 1 micron.

4, by said dry grinding of claim 1 and wet grinding process combined, be meant that the pulverized coal particle with the dry grinding gained joins in the coal slurry that makes with wet method, the proportional range of doing between the used thickness particle of wet method is thick: thin=1: 9 to 9: 1.

5, add additive by claim 1 is said at suitable position, be meant that additive can or grind the back when grinding and add, additive can once add, and also can repeatedly add.

6, by the said abundant stirring of claim 1, finish by a high speed agitator and at least two slow-speed mixers.Prepared water coal slurry concentration is more than 60%.