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Description:

Process flow introduction:
   
    Circulating fluidized bed gasification system is mainly composed of coal gasification system, desulfurization system, gas pressurization system, pneumatic conveying system, water treatment system and distributed control system, etc.
    After crushing and sieving, the pieces coal (size≤10mm) is carried to coal scuttle by the belt conveyors, and then conveyed to gasifier; reacts with the gasification agent which was preheated to 720℃ by heat exchanger I, reaction temperature is about 950℃ in the gasifier, streams are in the fluidization state, and the coal is heated evenly. So the tar, phenol and cyanide decompose completely under the high temperature.
    Raw coal gas flows through cyclone separator, heat exchanger I, heat exchanger II, fly-ash filter and heat exchanger III for cooling down and dedusting. At last the coal gas can be sent to users after desulphurization and pressurization.

Features:

    Clean: H2S≤20mg/Nm3, dust≤10mg/Nm3 in the coal gas;
    Efficient: gasification rate of pulverized coal≥3Nm3/kg, comprehensive utilization rate of coal≥90%. 
    Low operation cost: pieces coal can be used, it’s not necessary to use lump coal, reducing greatly production cost of coal gas.
    Gasification method: air or oxygen- enriched air as gasification agent.

Technical parameters:

system parameters of circulating fluidized bed gasification system

No.

Designation

Unit

Parameters

10kNm3/h

20kNm3/h

40kNm3/h

1

design pressure

kPa

50

50

50

2

design temperature

1100

1100

1100

3

operation pressure

kPa

25

25

25

4

operation temperature

950

950

950

5

application coal

 

bitumite

6

coal size

mm

0~10

0~10

0~10

7

load adjustment

%

60~110

60~110

60~110

8

steam pressure

MPa

0.3~1.5

0.3~1.5

0.3~1.5

9

steam output

t/h

2

4

8

10

               heat value
     (gasification agent: air)

kcal/Nm3

≥1250

≥1250

≥1250

11

                heat value
         (gasification agent:
        oxygen-enriched air)

kcal/Nm3

≥1550

≥1550

≥1550

12

tar/phenol water

kg/h

0

0

0

13

cold gas efficiency

%

72~78

72~78

72~78

14

heat value of coal

kcal/kg

>5000

15

application fields

 

ceramic, alumina, metallurgy, coking, power generation, etc

 

Technical specification:

  1. 10kNm³/h  Circulating Fluidized Bed Gasification System
  2. 20kNm³/h  Circulating Fluidized Bed Gasification System
  3. 40kNm³/h  Circulating Fluidized Bed Gasification System