Method and apparatus for converting coal to liquid hydrocarbons

• US 5,964,985 A
• Filed: 05/23/1997
• Issued: 10/12/1999
• Est. Priority Date: 02/02/1994
• Status: Expired due to Fees

• Current Assignee: William A. Wootten
• Original Assignee: William A. Wootten
• Inventors: Wootten, William A.
• Primary Examiner(s): Yildirim, Bekir L.
• Application Number:
  US08/863,030
• Time in Patent Office: 872 Days
• Field of Search: 201/5, 201/6, 201/8, 201/14, 201/25, 201/40, 208/400, 208/427, 208/402, 585/241
• US Class Current: 201/40
• CPC Class Codes: B01D 53/24 by centrifugal force centrifuges B04B; cyclones B04C
• CPC Class Codes: C10B 53/00 Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form wet carbonising of peat C10F
• CPC Class Codes: C10B 7/10 with conveyor-screws
• CPC Class Codes: C10G 1/02 by distillation
• CPC Class Codes: C10J 2300/0906 Physical processes, e.g. shredding, comminuting, chopping, sorting
• CPC Class Codes: C10J 2300/1807 Recycle loops, e.g. gas, solids, heating medium, water
• CPC Class Codes: C10J 3/56 Apparatus; Plants
• CPC Class Codes: C10K 1/02 Dust removal
• CPC Class Codes: C10K 1/028 by electrostatic precipitation separating dispersed particles from gases or vapour by electrostatic effect in general B03C3/00

Abstract

A method of forming liquid hydrocarbons from solid coal. The coal is pulverized to provide a particulate coal feed, which is then extruded to provide a hollow tube of compressed coal supported inside of a support tube. A clay feed is extruded to provide a hollow tube of compressed clay supported inside of the coal tube and a combustible fuel is burned inside of the clay tube. The temperature of combustion is sufficient to fire the extruded clay and pyrolyze the extruded coal to produce hydrocarbon gases and coal char. The support tube has holes for releasing the hydrocarbon gases, which contain suspended particles formed during combustion. The suspended particles are removed from the hydrocarbon gases to provide clean gases, which are passed through an ionizing chamber to ionize at least a portion thereof. The ionized gases are then passed through a magnetic field to separate them from each other according to their molecular weight. Selected portions of at least some of the separated gases are mixed, and the mixed gases are cooled to provide at least one liquid hydrocarbon product of predetermined composition.

Claims

1. A method of forming liquid hydrocarbons from solid coal comprising the steps of:

pulverizing the coal to provide a particulate coal feed;

extruding said coal feed to provide a hollow tube of compressed coal supported inside of a support tube;

extruding a clay feed to provide a hollow tube of compressed clay supported inside of said coal tube;

burning a combustible fuel inside of said clay tube, the temperature of said combustion being sufficient to fire said extruded clay and pyrolyze said extruded coal to produce hydrocarbon gases and coal char, said support tube having holes for releasing said hydrocarbon gases, and said hydrocarbon gases containing suspended particles formed during said combustion;

removing said suspended particles from said hydrocarbon gases to provide clean gases;

passing said clean gases through an ionizing chamber to ionize at least a portion of said clean gases;

passing said ionized gases through a magnetic field to separate said ionized gases from each other according to their molecular weight;

mixing selected portions of at least some of said separated gases; and

cooling said mixed gases to provide at least one liquid hydrocarbon product of predetermined composition.

2. A method according to claim 1, wherein said suspended particles are removed from said hydrocarbon gases by passing said hydrocarbon gases through a bed of metal balls contained within a chamber, each of said metal balls having a plurality of through holes for the passage of said hydrocarbon gases, and said passage of the hydrocarbon gases causing said suspended particles to be deposited as a residue on said metal balls;

withdrawing a portion of said metal balls from the bed in said chamber;

cleaning said withdrawn metal balls by blasting them with an inert gas to remove said residue; and

,

returning said cleaned metal balls to the bed in said chamber.

3. A method according to claim 1, further comprising the steps of:

breaking up and cooling said fired clay and said coal char to provide pieces of clay and pieces of char;

separating said char pieces from said clay pieces;

pulverizing said char pieces to provide powdered char; and

dispersing said powdered char in a combustible liquid to provide a liquid hydrocarbon fuel, said combustible liquid being formed by a process comprised of heating a solid plastic material.

4. A method according to claim 3, wherein said suspended particles are removed from said hydrocarbon gases by:

passing said hydrocarbon gases through a bed of metal balls contained within a chamber, each of said metal balls having a plurality of through holes for the passage of said hydrocarbon gases, and said passage of the hydrocarbon gases causing said suspended particles to be deposited as a residue on said metal balls;

continuously withdrawing a portion of said metal balls from the bed in said chamber;

cleaning said withdrawn metal balls by blasting, them with an inert gas to remove said residue; and

,

returning said cleaned metal balls to the bed in said chamber.

5. A method according to claim 1, wherein said support tube is rotated at least during said coal extruding step, and wherein said support tube holes release said hydrocarbon gases into an oxygen free chamber.

6. A method according to claim 1, wherein a cryogen is used in the cooling of said mixed gases to provide said liquid hydrocarbon product.

7. A method according to claim 1, wherein said liquid hydrocarbon product comprises a reaction product of at least two of said mixed gases.

8. A method of converting solid coal and a solid plastic material to a liquid fuel comprising the steps of:

pulverizing the coal to provide a particulate coal feed;

extruding said coal feed to provide a hollow tube of compressed coal supported inside of a support tube;

extruding a clay feed to provide a hollow tube of compressed clay supported inside of said coal tube;

burning a combustible fuel inside of said clay tube, the temperature of said combustion being sufficient to fire said extruded clay and pyrolyze said extruded coal to produce hydrocarbon gases and coal char, said support tube having holes for releasing said hydrocarbon gases;

breaking up and cooling said fired clay and said coal char to provide pieces of clay and pieces of char;

separating said char pieces from said clay pieces;

pulverizing said char pieces to provide powdered char; and

dispersing said powdered char in a combustible liquid to provide a liquid hydrocarbon fuel, said combustible liquid being formed by a process comprised of heating the solid plastic material.

9. A method according to claim 8, wherein said combustible liquid forming process comprises heating a waste plastic material containing organic chlorides to a sufficiently high temperature and compressing said waste plastic material in the presence of water at a sufficiently rapid rate to expel chlorine ions from said waste plastic material and convert said expelled chlorine ions to hydrogen chloride.

10. A method according to claim 8, wherein said support tube is rotated at least during said coal extruding step, and wherein said support tube holes release said hydrocarbon gases into an oxygen free chamber.