Frederick O Lewis

US Patent:

43912087, Jul 5, 1983

Filed:

Sep 29, 1980

Appl. No.:

6/192021

Inventors:

Frederick M. Lewis - Mountain View CA

Assignee:

Sterling Drug, Inc. - New York NY

International Classification:

F23G 504

US Classification:

110346

Abstract:

The present invention relates to a method for efficiently incinerating waste material, particularly dewatered sludge, in a multiple hearth furnace by controlling the temperature of the individual hearths of the furnace within certain prescribed limits by modulating the amount of combustion air, and controlling the temperature of the afterburner or combustion hearths to within certain prescribed limits by splitting the feed sludge between the first two upper waste material handling hearths.

US Patent:

44818904, Nov 13, 1984

Filed:

Sep 24, 1982

Appl. No.:

6/423211

Inventors:

Frederick M. Lewis - Mountain View CA

Assignee:

Sterling Drug Inc. - New York NY

International Classification:

F23G 500

US Classification:

110225

Abstract:

The present invention relates to a method for efficiently incinerating waste material, particularly dewatered sludge, in a multiple hearth furnace by controlling the temperature of the individual hearths of the furnace within certain prescribed limits by modulating the amount of combustion air, and controlling the temperature of the after-burner or combustion hearths to within certain prescribed limits by splitting the feed sludge between the first two upper waste material handling hearths.

US Patent:

44112033, Oct 25, 1983

Filed:

Jun 8, 1982

Appl. No.:

6/386433

Inventors:

Frederick M. Lewis - Mountain View CA

Assignee:

Sterling Drug Inc. - New York NY

International Classification:

F23J 300

US Classification:

110341

Abstract:

A process is disclosed in which any off-gas generated in a wastewater treatment plant, which off-gas has a low calorific (or BTU) value about one-tenth of that of natural gas, and usually even less, may be profitably burned in a multiple hearth furnace if the off-gas is first wet-scrubbed to a temperature below about 90. degree. F. , then pre-heated by passing it through the center shaft of a multiple hearth furnace, before the pre-heated gas is burned. Such cooling of the off-gas by wet-scrubbing has the effect of lowering the moisture content of the wet-scrubbed gas sufficiently so that it may be advantageously pre-heated in the center shaft of the furnace and recycled to the hearths to assist in the combustion of sludge. In addition to providing desirable savings in auxiliary fuel usage, wet-scrubbed off-gas is unexpectedly cleansed of a sufficient amount of its corrosive components so as to permit ducting the wet-scrubbed gas in mild steel or cast iron equipment. Further, burning an odorous gas conveniently deodorizes it.

US Patent:

44599234, Jul 17, 1984

Filed:

Feb 18, 1983

Appl. No.:

6/467606

Inventors:

Frederick M. Lewis - Mountain View CA

Assignee:

Sterling Drug, Inc. - New York NY

International Classification:

F23G 504

US Classification:

110346

Abstract:

The present invention relates to a method and apparatus for controlling the operation of a multiple hearth furnace system for efficiently incinerating combustible materials, such as sludge in which the air of combustion is essentially all introduced at the bottom of the furnace to incinerate solid materials. This control involves the following essential steps: scanning the temperature of two or more combustion hearths to determine which is the hottest hearth; controlling the temperature of the thus-determined hottest hearth at a predetermined temperature set point value; controlling the oxygen content of the system exhaust gas at least as high as the predetermined set point value; and maintaining the system exhaust temperature at least as high as the predetermined set point value.

US Patent:

41220366, Oct 24, 1978

Filed:

Jan 7, 1977

Appl. No.:

5/757661

Inventors:

Frederick Michael Lewis - Mountain View CA

Assignee:

Waterfront N.V. - Curacao

International Classification:

C01B 3110
B01J 2118
C01B 3108
C10B 5100

US Classification:

252421

Abstract:

A method of pyrolyzing sewage sludge to transform the same into activated carbon, with the combustible pyrogas and volatile liquids included therewith that arise from the pyrolysis operation being burned to sustain the transformation operation. A first portion of the hot activated carbon resulting from the operation is mixed with the wet sewage sludge to provide a dry sludge mixture that is subsequently subjected to the pyrolyzing operation. Water vapor that discharges as the hot activated carbon is mixed with the wet sewage sludge is heated by the burning of the pyrogas and transformed to steam. The resulting steam is in contact with the dry mixture during the pyrolyzing operation, and as a result the dry mixture is transformed to activated carbon. A second portion of the resulting activated carbon is separated from the first portion thereof, with this second portion being available for use apart from the method.

US Patent:

44741219, Oct 2, 1984

Filed:

Dec 21, 1981

Appl. No.:

6/333102

Inventors:

Frederick M. Lewis - Mountain View CA

Assignee:

Sterling Drug Inc. - New York NY

International Classification:

F23G 706

US Classification:

110346

Abstract:

A method for controlling two-stage combustion furnaces having a first stage operated with sub-stoichiometric airflow and a second stage operated with excess air, whereby the first stage airflow is controlled such that the ratio of first stage airflow to total airflow is maintained less than ##EQU1## where N lies between zero and unity.

US Patent:

45179069, May 21, 1985

Filed:

Aug 30, 1983

Appl. No.:

6/528271

Inventors:

Frederick M. Lewis - Mountain View CA
George A. Berken - Kronenwetter WI

Assignee:

Zimpro Inc. - Rothschild WI

International Classification:

F23G 1500

US Classification:

110346

Abstract:

A two-stage starved air furnace system is controlled to simultaneously achieve desired temperatures and percent stoichiometric air operation in the primary stage by modulating transformation relay functions acting upon measured temperature deviations to change both primary combustion air and primary auxiliary burner operation. At the set-point value of percent stoichiometric air, the relay functions are modulated in reverse direction to satisfy changing heat demands.

US Patent:

44534744, Jun 12, 1984

Filed:

Sep 24, 1982

Appl. No.:

6/423213

Inventors:

Frederick M. Lewis - Mountain View CA

Assignee:

Sterling Drug, Inc. - New York NY

International Classification:

F23G 500

US Classification:

110188

Abstract:

The present invention relates to a method for efficiently incinerating waste material, particularly dewatered sludge, in a multiple hearth furnace by controlling the temperature of the individual hearths of the furnace within certain prescribed limits by modulating the amount of combustion air, and controlling the temperature of the afterburner or combustion hearths to within certain prescribed limits by splitting the feed sludge between the first two upper waste material handling hearths.