Claims
- 1. A process for producing gas containing CO and H.sub.2 in a gasifier having essentially two regions, a fluidized bed in a bottom region of the gasifier and a free board space above the fluidized bed in a top region of the gasifier, the process comprising the steps of:
- supplying lump coal having a moisture content of between about 2 and 7% from the top region through the free board space into the fluidized bed, the coal having a particle size from a lower limit of about 2.5 mm to an upper limit between about 10 mm and 40 mm, the upper limit being determined by the content of volatile matter in the coal such that:
- U=(100m.sub.v /M)-10,
- where U is the upper limit expressed in mm, and m.sub.v /M is the fractional content of the volatile matter in the coal.
- supplying exothermically reacting gasification agents into the fluidized bed through inlets in the bottom region of the gasifier, the fluidized bed being maintained at a height of between about 1 and 5 m; and
- removing the gas produced in the fluidized bed from the free board space of the gasifier countercurrent to the coal being supplied to the fluidized bed at a rate such that the superficial fluid velocity of the gas measured in the free board space is between about 0.2 and 1.4 m/s.
- 2. The process of claim 1 wherein the height of the fluidized bed is maintained between about 1.5 and 3 m.
- 3. The process of claim 1 wherein the removal rate of gas produced during the process is controlled such that the superficial fluid velocity of the gas is between about 0.6 and 0.8 m/s.
- 4. The process of claim 1 wherein the moisture content of the coal supplied to the gasifier is maintained between about 4 and 5%.
- 5. The process of claim 1 further comprising the steps of separating entrained dust from the gas produced, and returning the dust to the fluidized bed of the gasifier above the point of supply of said exothermically reacting gasification agents.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3537758 |
Oct 1985 |
DEX |
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CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 917,415 filed Oct. 10, 1986, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3867110 |
Schora et al. |
Feb 1975 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2700281 |
Jul 1978 |
DEX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
917415 |
Oct 1986 |
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