Integrated drying and gasification process for simultaneously producing synthetic gas and high rank coal

Patent metadata

Field	Value
Publication number	US-10023817-B2
Application number	US-201815872340-A
Country	US
Kind code	B2
Filing date	Jan 16, 2018
Priority date	Dec 20, 2012
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

The present invention relates to a gasification process for efficiently co-producing synthesis gas and high-grade coal from water-containing coal, and to an integrated drying and gasification system for realizing the same.

First claim

What is claimed is:

1. An integrated drying and gasification system, comprising:
a gasifier;
a dryer disposed in front of the gasifier to dry low-quality water-containing coal in contact with synthesis gas recycled from the gasifier and then discharge dried coal and synthesis gas;
a solid-gas separator for separating the dried coal and synthesis gas discharged from the dryer;
a recovery unit for separating and recovering a part of the dried coal separated by the solid-gas separator; and
a loop seal type transfer unit transferring target amounts of the separated dried coal to the gasifier in a fluidic state and including a plurality of aeration gas inlets,
wherein the synthesis gas discharged from the gasifier is directly recycled to the dryer without passing through a heat exchanger, and the dryer provides a drying capacity necessary for producing the dried coal separated and recovered from the low-quality water-containing coal and the dried coal transferred to the gasification step.

2. The integrated drying and gasification system of claim 1 , further comprising a recovery unit for separating and recovering tar included in the synthesis gas separated by the solid-gas separator.

3. The integrated drying and gasification system of claim 1 , wherein the recovery unit for recovering the dried coal is a drain hopper or a continuous depressurization drain unit.

4. The integrated drying and gasification system of claim 1 , wherein the content of water in the low-quality water-containing coal is 10 to 70 wt %.

5. The integrated drying and gasification system of claim 1 , wherein the dried coal has a water content of 10 wt % or less.

6. The integrated drying and gasification system of claim 1 , wherein the dryer is a pneumatic or flash dryer, a fluidized-bed dryer, a rotary dryer or a rotary tube dryer.

7. The integrated drying and gasification system of claim 1 , wherein the low-quality water-containing coal and synthesis gas are in contact with each other in a parallel stream in the dryer.

8. The integrated drying and gasification system of claim 1 , wherein the operating pressure in the dryer is 60 kg/cm 2 or less, the operating temperature at an inlet of the dryer is adjusted in a range of 400 to 1500 μm, and the operating temperature at an outlet of the dryer is adjusted in a range of 200 to 700 μm.

9. The integrated drying and gasification system of claim 1 , the aeration gas is nitrogen, carbon dioxide, steam, synthesis gas generated from the gasifier, or a mixture thereof.

10. The integrated drying and gasification system of claim 1 , wherein the operating temperature in the gasifier is 400 to 1500 μm, and the operating pressure in the gasifier is 1 to 60 kg/cm 2 .

Assignees

• Sk Innovation Co Ltd
• Sk Energy Co Ltd

Inventors

• Kim Yong Jeon
• Park Jong Sund
• Kim Gyoo Tae
• Ko Nan Hee
• Lee Chun Won
• Shin Jae Wook

Classifications

• C10L9/08

  by heat treatments, e.g. calcining · CPC title

• C10J2300/0909

  Drying · CPC title

• C10L5/02 Primary

  {Solid fuels such as} briquettes consisting mainly of carbonaceous materials of mineral {or non-mineral} origin (peat briquettes C10F) · CPC title

• C10J2300/093

  Coal · CPC title

• C10L2290/06

  Heat exchange, direct or indirect · CPC title