A novel hybrid design that combines solid waste plasma gasification

gas turbine

absorption heat pump

and coal-fired combined heat and power plant has been proposed. In the integrated scheme

medical waste is sent to the plasma gasifier and converted to syngas

which is conveyed into the gas turbine system after the necessary treatment. In terms of waste heat utilization of syngas and flue gas

some are used by the absorption heat pump for heating

and the rest are used to heat the feedwater of the coal-fired combined heat and power plant directly. Based on a typical coal-fired combined heat and power plant

the benefits of this system are examined in terms of both thermodynamics and economics. Once the heat supply and the net electricity from coal remain the same

the net power generated by the waste in the hybrid design is 7.47 MW

while the net waste-to-energy efficiency reaches 47.96%. In just 5.23 years

the initial investment in the proposed system is recouped

and in its 25-year lifetime

the system achieves a net present value of 50 362.94 thousand CNY.