Method and plant for co-generation of heat and power

A combined heat and power plant (CHP plant), which is steam-integrated with one or more facilities configured to export steam to the CHP plant, the CHP plant comprising:

• one or more HP steam turbines to generate power and one or more MP steam turbines to generate power;
• a hot flue gas generator generating hot flue gas;
• a heat recovery steam generator (HRSG) downstream of the hot flue gas generator to cool hot flue gas in a sequence of cooling steps to recover heat and to generate steam, said cooling of the hot flue gas including superheating MP steam imported from one or more of said facilities configured to export steam to the CHP plant, the HRSG comprising:
• a high pressure (HP) steam evaporator downstream of the hot flue gas generator to generate HP steam from heat recovered from the hot flue gas;
• at least one HP steam superheater between the hot flue gas generator and the HP steam evaporator to superheat at least HP steam from the HP steam evaporator with heat recovered from the hot flue gas;
• at least one first medium pressure (MP) steam superheater upstream of the HP steam evaporator and downstream of said at least one HP steam superheater to receive flue gas cooled by said at least one HP steam superheater to superheat said MP steam imported from one or more of said facilities configured to export steam to the CHP plant with heat recovered from the hot flue gas;
• and
• at least one second MP steam superheater downstream of the HP steam evaporator to superheat said MP steam imported from one or more of said facilities configured to export steam to the CHP plant with heat recovered from the hot flue gas;
• wherein the CHP plant is configured to supply said MP steam imported from one or more of said facilities configured to export steam to the CHP plant to said at least one first and second MP steam superheaters, wherein said at least one second MP steam superheater is configured to superheat said imported MP steam to a first superheated temperature and said at least one first MP steam superheater is configured further to heat said imported MP steam to a second superheated temperature which is higher than the first superheated temperature, and wherein said one or more MP steam turbines and said one or more HP steam turbines are sized such that the power produced by the one or more MP steam turbines is at least the same or more than the power produced by the one or more HP steam turbines.