Heat integration of combined 1st and 2nd generation ethanol production from wheat kernels and wheat straw

Sustainable Chemical Processes

Table 2 Heating and cooling demands for the four ethanol plant investigated, with and without heat integration

	1G		2G		Co-located 1G & 2G		Combined 1G & 2G
	Hot	Cold	Hot	Cold	Hot	Cold	Hot	Cold
Heating and cooling demand
Without heat integration (MW)	63	49	48	46	108	95	88	83
With heat integration (MW)	36	22	25	23	63	47	53	48
Energy demand per kg ethanol produced
Without heat integration (MJ/kg)	25	20	42	40	31	28	26	25
With heat integration (MJ/kg)	15	10	23	21	19	15	17	16

The energy used per kg ethanol produced in the process is presented in the last two lines.