Two-stage gasifier has a top gas outlet which carries gas by dry distillation of coal in upper section and Thusgas in bottom section containing no tar is taken out for just dust removal. Top gas after tar separation in an ESP is mixed with desusted bottom gas and form the detarred and dedusted hot gas.

Coal and clean gas, pressurized is by further processing of above gas wherein dedusted bottom gas is cooled down before mixed with top gasafter the tar separation. It is handled to first separate out carbolics in an indirect cooler and followed by another separation of light oil and other volatiles in an ESP. clean gas is pressurized, and also desulphurised when run on Engine genset.

Gasification efficiency,overall thermal efficiency is higher in two-stage gasifier than single stage. Water saving, Space saving, Operation economy are the feature and PLC control of multiple units is practiced.

  1. Hot deterred and dedusted gas
  2. Cold and Clean gas, pressurized

Body Structure : Gasifier  liningis by molding method, which gives advantages of providing better heat conduction, carbonization and convenient maintenance & repair.

Coal Loading :Multi – pipe coal loading unit is adopted so that coal is distributed homogenously on hearth. Coal loader can be put into auto-mode use being equipped with coal detector.

Water jacket :  Water jacket enables side-steam generation for gasifying coal.

Ash removal :Ash removal is in wetted way, and intermittently by rachet wheel and pallet, from both sides. A special tool enables steady convey and removal.

TWO –STAGE COAL GASIFIER

TWO –STAGE COAL GASIFIER

TypeUnit             Standard of Gasifier
Issue
 Φ 1.5Φ 1.7Φ 2.0Φ 2.2Φ 2.4Φ2.6Φ 3.0Φ 3.2Φ 3.4
I.D of Chamber
m1.51.722.22.42.633.23.4
Grate Section
1.772.273.143.84.525.317.078.049.08
Applicable Coal
 Less-glutinosity, Anthracite, Coking Coal,Non-Coking Coal
Coal Size
mm                                        13 – 50
Coal Consumption
Kg/h350-
500
450-
700
600-
900
800-
1000
1000-
1200
1300-
1500
1700-
2100
1900-
2200
2300-
2500
Gasifying Agent
                                               Air and Vapor
Gas Output
Nm³/h1200-
1600
1600-
1900
2150-
2850
2500-
3500
3600-
4500
4000-
5500
6000-
7000
6500-
7500
7600-
8500
Calorific Value
KJ/Nm³                  5000 – 6100
Gas Temerature
  °C                   400 – 500
Gas Pressure
Pa                 ≤ 1500         ≤ 2000
Air Pressure
Pa     ≤ 3000 ≤ 3500   ≤ 5000       ≤ 5500
Saturated
Temperature
    °C                                            50 – 65
Pressure Of Water Jacket
Kpa50
Pressure Of Fire-
finder Device
Kpa300
Ash-pan Revolution
 r/h                 1.0-2.00.17
Power Of Ash-
removing
 KW2.235.57.5
Power Of Stoker
 KW2.24
Characteristic
Water Jacket  Manual / Hydraulic Coal-loading  
Air + Steam Auto-Feeding
Drive Mode
                              Hydraulic Drive Ash – discharging