The invention discloses a 
waste heat recovery IGCC (
integrated gasification combined cycle) combined heat and power generation central 
heating system and method. The 
system comprises an 
air separation unit, a gasification furnace, a 
gas cooler, a purification 
plant, a gas 
turbine, a 
waste heat boiler, an 
absorption heat pump and a 
heat exchanger, which are connected successively. An exhaust 
smoke outlet of the 
waste heat boiler is emptied or is connected with a 
smoke inlet of a 
smoke condensation 
heat exchanger; a steam outlet of the waste heat boiler is connected with an inlet of a 
steam turbine; an exhaust steam outlet of the 
steam turbine is connected with a steam inlet of a condenser; a circulating water outlet of the condenser is connected with a 
cooling tower; a low-pressure extracted steam outlet of the 
steam turbine is divided into three paths, two paths or one path of 
temperature drop, and 
heat supply network return water is conveyed to a 
heat supply network for use after being heated. The invention also provides a central heating method. Clean and efficient IGCC is combined with extracted steam 
heat supply of the steam 
turbine, the extracted steam of the steam 
turbine is used for driving the 
absorption heat pump, the exhaust steam waste heat of the steam turbine and the smoke waste heat are recycled, and the extracted steam heat of the steam turbine and the recycled waste heat are utilized for central heating. The 
recovery waste heat IGCC combined heat and power generation central 
heating system and method have the characteristics of cleanliness, high efficiency, 
mature technology, high recycled waste heat amount, and capability of recycling smoke condensate water.