Fluidized bed biogasifier and method for gasifying biosolids

  • US 9,809,769 B2
  • Filed: 12/14/2015
  • Issued: 11/07/2017
  • Est. Priority Date: 01/30/2012
  • Status: Active Grant
First Claim
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1. A method for gasifying biosolids obtained from sewage sludge, comprising:

  • receiving biosolids in a fluidized bed biogasifier, the biogasifier having;

    a reactor vessel;

    a freeboard section having a diameter of at least 57 inches and a height of at least 10 feet;

    a feeder for feeding biosolids into said reactor vessel, said feeder being configured to feed said biosolids into said reactor vessel at a biosolids fuel feed rate during steady-state operation of the biogasifier; and

    a fluidized bed in a bed section of said reactor vessel, said fluidized bed having a diameter of at least 45 inches;

    wherein the freeboard section has a greater diameter than the fluidized bed,wherein the ratio of the freeboard section diameter to the fluidized bed diameter is at least 57;

    45;

    and further wherein a ratio of a height of the bed section of the reactor vessel to a depth of the fluidized bed is 1.5;

    introducing gas to said fluidized bed reactor; and

    heating and reacting said biosolids inside said biogasifier, whereby biosolids are gasified.

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