The invention discloses a composite type
solid-waste gasifying device. The composite type
solid-waste gasifying device is characterized in that a reciprocating grate and a bubbling fluidized-
bed reactor structure are combined, waste is firstly dried, pyrolyzed and gasified on the front-section reciprocating grate, and the rear-section
fluidized bed device is used for
pyrolysis of residual waste and suspended
combustion of gasified
slag. The reciprocating grate adopts a plurality of sections of high-temperature air distribution to dry, pyrolyze and gasify the waste so as to provide partial heat, and a long rear arch maintains high temperature under high-temperature
flue gas, and is used for increasing
radiant heat on the grate and providing energy for pyrolyzing and gasifying the waste with low calorific value. The high-temperature
flue gas generated by
combustion of a
fluidized bed maintains high-temperature environment of the wall surface of the rear arch of the grate, and the
slag is discharged by a
slag discharging hole at the middle part of an air distributing plate of the
fluidized bed. The composite type
solid-waste gasifying device disclosed by the invention has the beneficial effects that the advantages of the traditional grate and the traditional fluidized-
bed reactor are integrated; due to the
radiation of a long high-temperature rear arch, the content of
tar in gasified gas can be effectively reduced; full
burning out of bottom slag is realized by the fluidized
bed, so that high-efficiency gasification of low-grade waste is realized.