US3938965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing solid industrial fuel
Assignee: Kingsford Co
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Filing: 1973-04-05
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Granted: 1976-02-17
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Expires: 1993-04-05
Abstract
Abstract An improved process for producing solid fuel from woody materials, which fuel may be characterized as having a low and relatively nonabrasive ash, is described. The process includes the steps of carbonizing the woody materials to form charcoal; cooling, conditioning and stabilizing the charcoal; crushing the charcoal typically to a particle size that will pass through about a 16 mesh or finer screen, beneficating the crude crushed charcoal by separating, on the basis of density, a dense fraction which may constitute from about 5 to 25 or more weight percent of the crude charcoal; and subsequently milling the beneficated product, if desired, to form a powdered fuel, or for compacting to make barbeque briquettes.
Inventors
- 👤 Owen Pyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:55
CPC Classifications
C; C10; C10L; C10L5/00; C10L5/40; C10L5/44; Y; Y02; Y02E; Y02E50/00; Y02E50/10; Y02E50/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A process for producing a substantially pollution-free fuel from moist woody vegetable materials comprising the steps of: continuously supplying said materials to dryer; drying said materials until the moisture content thereof is less than approximately 15 percent; admitting said dried materials to a carbonizer; pyrolyzing said materials in said carbonizer to form crude charcoal and a fuel gas therefrom; collecting at least a major portion of the fuel gas and charcoal formed; cooling and conditioning said charcoal against spontaneous combustion; crushing said charcoal until it will pass through an approximately 16 mesh U.S. Standard sieve but no finer than will just pass through about an 80 mesh sieve; beneficating said crude charcoal in a classifier and removing a dense fraction having a bulk density of at least about 50 lbs. per cubic foot therefrom to form a beneficated fuel which will produce, when burned, low relatively nonabrasive ash.
Claim 2
Dependent Claim
148 words
A process for producing a substantially pollution-free fuel from moist woody vegetable materials comprising the steps of: continuously supplying said materials to dryer; drying said materials until the moisture content thereof is less than approximately 15 percent; admitting said dried materials to a carbonizer; pyrolyzing said materials in said carbonizer to form crude charcoal and a fuel gas therefrom; collecting at least a major portion of the fuel gas and charcoal formed; cooling and conditioning said charcoal against spontaneous combustion; crushing said charcoal until it will pass through an approximately 16 mesh U.S. Standard sieve but no finer than will just pass through about an 80 mesh sieve; beneficating said crude charcoal in a classifier and removing a dense fraction having a bulk density of at least about 50 lbs. per cubic foot therefrom to form a beneficated fuel which will produce, when burned, low relatively nonabrasive ash.
Claim 3
Dependent Claim
36 words
The process of claim 1 further comprising conveying said gas and beneficated charcoal through a mill; pulverizing said charcoal in said mill; and entraining said pulverized charcoal in said gas to form an enriched fuel gas.
Claim 4
Dependent Claim
54 words
The process of claim 1 further comprising collecting said beneficated charcoal; collecting at least a major portion of said fuel gas; admitting said gas and said charcoal to an adsorber; cooling said gas in said adsorber and allowing the condensible combustible matter therein to adsorb on said charcoal to form an enriched solid fuel.
Claim 5
Dependent Claim
40 words
The process of claim 3 further comprising the steps of: collecting said gas after the condensible combustible matter therein has been adsorbed on said charcoal; collecting said enriched, beneficated charcoal; pulverizing said collected charcoal to form a solid powdered fuel.
Claim 6
Dependent Claim
22 words
The process of claim 1 further comprising the step of pulverizing said beneficated charcoal in a mill to produce a powdered fuel.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein said woody materials are pyrolyzed in said carbonizer at least until the fibre structure thereof is destroyed to form crude Pyrochar.
Claim 8
Dependent Claim
28 words
The process of claim 6 wherein the step of removing the dense fraction comprises separating from 5 to about 25 percent by weight of said crude Pyrochar therefrom.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |