# US 2014/0150331 A1 · System and method for preparing coal water slurry

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- Number: US 2014/0150331 A1
- Document ID: US20140150331A1
- Status: Published application
- Kind: A1
- Application number: 14/089,825
- Filed: 2013-11-26
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: General Electric Company
- Applicants: General Electric Company
- Inventors: Xijing Bi; Junli Xue; Dejia Wang
- Web page: https://patentgrep.com/patent/US20140150331A1

## CPC

- C10L 1/326: {Coal-water suspensions}
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS

## Abstract

A system for preparing a coal water slurry, comprising: a first unit for providing a stream of coarse coal water slurry; a second unit for providing a stream of ultrafine coal water slurry; a third unit for providing a stream of dry coarse coal particles; and a mixing unit for mixing the stream of coarse coal water slurry, the stream of ultrafine coal water slurry and the stream of dry coarse coal particles. An associated method is also presented.

## Claims

### Claim 1

A system for preparing a coal water slurry, comprising:
a first unit for providing a stream of coarse coal water slurry;
a second unit for providing a stream of ultrafine coal water slurry;
a third unit for providing a stream of dry coarse coal particles; and
a mixing unit for mixing the stream of coarse coal water slurry, the stream of ultrafine coal water slurry and the stream of dry coarse coal particles.

### Claim 2 (depends on 1)

The system of claim 1, wherein the first unit comprises a wet mill.

### Claim 3 (depends on 1)

The system of claim 1, wherein the second unit comprises a wet mill.

### Claim 4 (depends on 1)

The system of claim 1, wherein the third unit comprises a dry mill or a dry crusher.

### Claim 5 (depends on 1)

The system of claim 1, further comprising a filtering unit after the mixing unit.

### Claim 6 (depends on 1)

The system of claim 1, wherein coal from the stream of coarse coal water slurry is greater than about 30 wt % of coal of the coal water slurry.

### Claim 7 (depends on 1)

The system of claim 1, wherein coal from the stream of ultrafine coal water slurry is less than about 30 wt % of coal of the coal water slurry.

### Claim 8

A method for preparing a coal water slurry, comprising:
preparing a stream of coarse coal water slurry;
preparing a stream of ultrafine coal water slurry;
preparing a stream of dry coarse coal particles; and
mixing the stream of coarse coal water slurry, the stream of ultrafine coal water slurry and the stream of dry coarse coal particles.

### Claim 9 (depends on 8)

The method of claim 8, wherein a wet mill is employed to prepare the stream of coarse coal water slurry.

### Claim 10 (depends on 8)

The method of claim 8, wherein a dry mill or a dry crusher is employed to prepare the dry coarse coal particles.

### Claim 11 (depends on 8)

The method of claim 8, wherein a wet mill is employed to prepare the stream of ultrafine coal water slurry.

### Claim 12 (depends on 8)

The method of claim 8, wherein the coarse coal water slurry comprises an additive.

### Claim 13 (depends on 8)

The method of claim 8, wherein the ultrafine coal water slurry comprises an additive.

### Claim 14 (depends on 8)

The method of claim 8, further comprising:
adding an additive during mixing the stream of coarse coal water slurry, the stream of ultrafine coal water slurry and the stream of dry coarse coal particles.

### Claim 15 (depends on 8)

The method of claim 8, further comprising:
filtering a mixture of the stream of coarse coal water slurry, the stream of ultrafine coal water slurry and the stream of dry coarse coal particles.

### Claim 16 (depends on 8)

The method of claim 8, wherein the stream of coarse coal water slurry comprises coal particles having a maximum particle size of less than about 1500 μm and a mean particle size of greater than about 100 μm.

### Claim 17 (depends on 8)

The method of claim 8, wherein the stream of ultrafine coal water slurry comprises coal particles having a mean particle size of smaller than about 20 μm.

### Claim 18 (depends on 8)

The method of claim 8, wherein the stream of dry coarse coal particles comprises coal particles having a maximum particle diameter of less than 1500 μm and a mean particle size of greater than about 100 μm.

### Claim 19 (depends on 8)

The method of claim 8, wherein coal from the stream of coarse coal water slurry is greater than about 30 wt % of coal of the coal water slurry.

### Claim 20 (depends on 8)

The method of claim 8, wherein coal from the stream of ultrafine coal water slurry is less than about 30 wt % of coal of the coal water slurry.