The invention discloses a method for producing
hydrogen through lignite chemical looping gasification based on a steel
slag oxygen carrier, which comprises the following steps: step 1, respectively
grinding steel
slag and lignite, and conducting screening to be 120 meshes or less; 2, weighing the steel
slag and the lignite according to the
mass percentage; 3, conducting
dry mixing for 15-20 min in a three-dimensional mixing
machine; 4, filling a reactor with the mixed material, so as to enable the gas to be in full contact with the material and capable of passing through the material; and 5, introducing
water vapor into the reactor in a
nitrogen atmosphere, and continuously conducting reacting at 900-950 DEG C to obtain
hydrogen. The method has the advantages that the pyrolytic steel slag is used as the
oxygen carrier, the
water vapor is introduced to react with the lignite in the
nitrogen atmosphere to produce the
hydrogen, the process flow is simple, the operation cost is low, and the
raw material source is wide; and elements such as iron,
magnesium, aluminum and
calcium in the pyrolytic steel slag are fully utilized, on one hand, the efficiency of chemical chain gasification
hydrogen production can be promoted, on the other hand, part of steel slag can be consumed, and reduction and
resource utilization of industrial
solid waste are achieved.