Pressurized wet combustion of wastes in the vapor phase
AssigneeDipac Associates
InventorNorman L. Dickinson
Life of this patent
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Abstract
Liquid wastes and solid wastes, which can be put into slurry form, have combustible constituents burned from them at supercritical temperature and subcritical pressure, with respect to water, resulting in purified water and, with the more concentrated wastes, recovery of valuable energy. Pressure makes possible the recovery of latent heat so that the dry heating value of the waste is made available. Consequently, relatively dilute wastes can be "incinerated" without the consumption of auxiliary fuel.
Claims26
A pressurized combustion process in which an aqueous waste is mixed with recycled combustion products and an oxygen-containing gas, and combustible constituents burned at supercritical temperature and subcritical pressure, with respect to water, net combustion products being cooled below their dewpoint at essentially combustion pressure, forming an aqueous slurry of non-combustible constituents and a wet flue gas.
A combination between a wet resources recovery and a slurry carbonization comprising the steps of:
- comminuting a Municipal Solid Waste and mixing it with water to form a dilute MSW slurry;
- subjecting the dilute MSW slurry to slurry-solids separations to recover therefrom particles of inorganic constituents, forming a dilute RDF slurry;
- dewatering the dilute RDF slurry to about a maximum pumpable concentration, forming a concentrated RDF slurry and primary recycle water;
- returning at least a portion of the primary recycle water to the slurrying of the comminuted Municipal Solid Waste;
- heating the concentrated RDF slurry under pressure to a temperature in the range of 350-550 degrees F., freeing formerly bound water and forming a hot slurry of carbonized RDF;
- dewatering the hot slurry of carbonized RDF to about a maximum pumpable concentration, forming a concentrated hot carbonized RDF slurry and freed hot water;
- returning at least a portion of the freed hot water to the slurrying of the comminuted Municipal Solid Waste;
Dependencies are inferred from the claim text.