公开(公告)号：US20210060629A1

公开(公告)日：2021-03-04

申请号：US17098658

申请日：2020-11-16

Applicant: CHEVRON U.S.A. INC.

Inventor： David G. Thomas ,  Kanwartej S. Sra ,  Paul J.H. Bireta ,  Gabriel P. Sabadell

IPC: B09C1/06 ,  F23G7/14

Abstract: Porous media containing undesired substances, e.g., perfluoroalkylated substances, are treated by mixing the porous media with a solid fuel comprising organic material. The mixture is heated to 200° C. to 400° C. to initiate smoldering combustion and an oxidizer gas is forced through the heated mixture such that the smoldering combustion is self-sustaining until the mixture reaches a PFAS destructive temperature and the perfluoroalkylated substances are thermally destroyed. A system is provided for conducting the treatment. The system includes a source of wax, wood chips, sawdust, tire scraps, waste rubber compounds, coal, granular activated carbon, solid fat, and combinations thereof as solid fuel. A mixer is provided for mixing the porous media with the solid fuel. An ignition system including static heating elements and a gas blower are provided for forcing heated oxidizer gas through the mixture such that self-sustaining smoldering combustion of the mixture is initiated and sustained.

公开(公告)号：US20240286180A1

公开(公告)日：2024-08-29

申请号：US18377019

申请日：2023-10-05

Applicant: CHEVRON U.S.A. INC.

Inventor： David G. Thomas ,  Kanwartej S. Sra ,  Paul J.H. Bireta ,  Gabriel P. Sabadell

IPC: B09C1/06 ,  F23G7/14

CPC classification number: B09C1/06 ,  F23G7/14 ,  F23G2209/24

Abstract: Porous media containing undesired substances, e.g., perfluoroalkylated substances, are treated by mixing the porous media with a solid fuel comprising organic material. The mixture is heated to 200° C. to 400° C. to initiate smoldering combustion and an oxidizer gas is forced through the heated mixture such that the smoldering combustion is self-sustaining until the mixture reaches a PFAS destructive temperature and the perfluoroalkylated substances are thermally destroyed. A system is provided for conducting the treatment. The system includes a source of wax, wood chips, sawdust, tire scraps, waste rubber compounds, coal, granular activated carbon, solid fat, and combinations thereof as solid fuel. A mixer is provided for mixing the porous media with the solid fuel. An ignition system including static heating elements and a gas blower are provided for forcing heated oxidizer gas through the mixture such that self-sustaining smoldering combustion of the mixture is initiated and sustained.