into useful by-products. The exhaust from plasma gasifier contains many toxic gases which can corrode
the turbine blades. It should be ensured that only syngas should be used to run turbines. To separate toxic
gases scrubbing is used. In scrubbing a series of processes is used to eliminate hazardous content one-by-
one. The basic system concepts involve the removal of particulate matter, acid gasses and sulphur,
mercury, and perhaps nitrogen using SCR (selective catalytic reduction).Particulate matter is treated using
water quench, cloth filters or venturi cyclones. Activated carbon beds are used to remove mercury and
other vaporized metals such as lead and cadmium, some of which also gets caught in the cloth filters.
Sulphur is removed a variety of different techniques, but the basic idea is to use an activated lime that
reacts with the sulphur to form either hydrochloric acid or an elemental sulphur. The sulphur products
have some commodity value and may be used in fertilizers.
The syngas is passed through a cross flow heat exchanger system which reduces the temperature of hot
gases from approx. 1200 degree Celsius to approx 400 degree Celsius (9). Proper insulation of pipes
carrying steam to the steam turbine is ensured. Steam is used to run the turbine following regenerative
and cogeneration cycles. Approximately, Steam turbine systems may generate 500-600kwh per ton of
MSW and the steam from the turbine output is condensed to form distilled water.
Hot gases from heat exchangers are employed for running gas turbine which works on Brayton cycle.
Gas turbines in a combined cycle may generate 1000-1200kwh per ton of MSW.
into useful by-products. The exhaust from plasma gasifier contains many toxic gases which can corrode
the turbine blades. It should be ensured that only syngas should be used to run turbines. To separate toxic
gases scrubbing is used. In scrubbing a series of processes is used to eliminate hazardous content one-by-
one. The basic system concepts involve the removal of particulate matter, acid gasses and sulphur,
mercury, and perhaps nitrogen using SCR (selective catalytic reduction).Particulate matter is treated using
water quench, cloth filters or venturi cyclones. Activated carbon beds are used to remove mercury and
other vaporized metals such as lead and cadmium, some of which also gets caught in the cloth filters.
Sulphur is removed a variety of different techniques, but the basic idea is to use an activated lime that
reacts with the sulphur to form either hydrochloric acid or an elemental sulphur. The sulphur products
have some commodity value and may be used in fertilizers.
The syngas is passed through a cross flow heat exchanger system which reduces the temperature of hot
gases from approx. 1200 degree Celsius to approx 400 degree Celsius (9). Proper insulation of pipes
carrying steam to the steam turbine is ensured. Steam is used to run the turbine following regenerative
and cogeneration cycles. Approximately, Steam turbine systems may generate 500-600kwh per ton of
MSW and the steam from the turbine output is condensed to form distilled water.
Hot gases from heat exchangers are employed for running gas turbine which works on Brayton cycle.
Gas turbines in a combined cycle may generate 1000-1200kwh per ton of MSW.
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