US1789401A - Air heater - Google Patents

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Publication number
US1789401A
US1789401A US434009A US43400930A US1789401A US 1789401 A US1789401 A US 1789401A US 434009 A US434009 A US 434009A US 43400930 A US43400930 A US 43400930A US 1789401 A US1789401 A US 1789401A
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United States
Prior art keywords
air
hot gases
heat exchanger
gases
flue
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US434009A
Inventor
Davy Christopher Samuel
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Babcock and Wilcox Co
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Babcock and Wilcox Co
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Publication date
Priority to GB1789401X priority Critical
Application filed by Babcock and Wilcox Co filed Critical Babcock and Wilcox Co
Application granted granted Critical
Publication of US1789401A publication Critical patent/US1789401A/en
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Expired - Lifetime legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23MCASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M20/00Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S122/00Liquid heaters and vaporizers
    • Y10S122/01Air heater

Description

C.-$. DAVY Jan. 20, 1931.
AIR HEATER Filed March 7, 1930 .INVENTOR ATTzfiN Patented Jan. 20, 1931 UNITED STATES.
PATENT OFFICE CHRISTOPHER SAMUEL IDAVY, OF LONDON, ENG-LAND, ASSIGNOR TO THE BAIBCOCK & WILGOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY m HEATER Application filed March 7, 1930, Serial No. 484,009, and in Great Britain January 1929.
This invention relates to furnaces such, for example, as boiler furnaces and more particularly to improvements in the air supply systems for such furnaces.
An object of this invention is to provide an improved arrangement for heating and conditioning the air employed for combustion purposes.
This and other objects which will be apparent to those skilled in this particular art are accomplished by means of the invention illustrated in the accompanying drawing in which.
The figure in the drawing is a transverse sectional view, somewhat diagrammatic in form, illustrating a boiler furnace provided with an air conditioning and heating system constructed in accordance with one embodiment of this invention.
\Vith reference to that particular form the invention illustrated in the drawing, a boiler of any desired type is shown in connection with a furnace combustion chamber 6 provided with a fuel supply mechanism such, for example, as a chain grate stoker 7. A passage 8 for the products of combustion leads to an air heater 9 through which the gases are drawn by an induced,draft mechanism 10 and by which they are delivered to the stack 11. The air heater 9 may be of any desired type but as illustrated is of the tubular type in which the waste gases pass through the tubes. A blower 12 forces air for combustion through a connecting duct 13 to the air inlet 14 of the heater and thence through the air outlet 15 to the duct 16 which is arranged to deliver the heated air beneath the chain grate stoker 7.
A blower 17 has its inlet connected by a duct 18 with the flue passage 8 and the blower is arranged to deliver inert gas from the flue passage to the hot air duct 16 where the gases are mingled with the incoming air and the heat of the inert gases is employed to raise the temperature of the incoming air. Bafiles 11 are provided for directing the incoming gases.
It will be appreciated that, by the use of this arrangement of air heater in two sections, a reduction in the amount of surface of the convection type heater section is ob-' tained compared with that required where only a' convection type of air heater is employed. Also, a reduction is obtained in the radlatlon losses which occur where the heat from the waste gases is transmitted through .ment I am enabled to carry the temperature of the heated air higher than would be the case if the air were not heated by admitting a portion of the gases of combustion directly to it; and that the arrangement of longitudinal passages is particularly effective in keeping down soot deposit, thereby enhancing heat transfer.
What I claim as new and desire to secure by Letters Patent is:
1. In combination, a furnace having a flue for the outgoing hot gases, a heat exchanger in the flue and having separate passages for the hot gases and air to be heated thereby, means passing air through said air passages in a direction counter-current to the flow of hot gases, and means by-passing a portion of the hot gases entering the heat exchanger to the heated air which has passed through the heat exchanger to additionally raise the temperature of the air by physical contact.
2. In combination, a furnace having a flue for the outgoing hot gases, a heat exchanger in the flue and having separate upright longitudinal passages for the hot gases and air to be heated thereby, means passing air through said air passages in a direction counter-current to the flow of hot gases, and means bypassing a portion of the hot gases entering the heat exchanger to the heated air which has passed through the heat exchanger to additionally raise the temperature of the air by physical contact.
.3. The combination with a steam generator, of a furnace having a flue for the outgoing hot gases, a metallic heat exchan er in the flue and having separate passages or the hot gases and air to be heated thereby, means passing air through said air passages in a direction counter-current to the flow of hot gases, and means by-passinga portion of the hot gases enterin the heat exchanger to the heated air whichias passed through the heat exchanger to additionally raise "the tem perature of the air by physical contact.
4. The combination with a steam generator, of a furnace having a flue for the out going hot gases, a metallic heat exchanger in the flue and having separate upright longitudinal passages for the hot gases and air to be heated thereby, means passing air through said air passages in a direction counter-current to the flow of hot gases, and means bypassing a portion of the hot gases entering the heat exchanger to the heated air which has passed through the heat exchanger to additionally raise the temperature of the air by physical contact.
CHRISTOPHER SAMUEL DAVY.
US434009A 1929-01-08 1930-03-07 Air heater Expired - Lifetime US1789401A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1789401X 1929-01-08

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US1789401A true US1789401A (en) 1931-01-20

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495550A (en) * 1944-05-26 1950-01-24 Tech Studien Ag Operating gas heater for thermal power plants
US2737930A (en) * 1949-04-16 1956-03-13 Babcock & Wilcox Co Vapor generating and superheating method and apparatus
US2886013A (en) * 1951-08-23 1959-05-12 Babcock & Wilcox Co Vapor generating, superheating, and reheating method and apparatus therefor
US3892191A (en) * 1974-05-13 1975-07-01 Foster Wheeler Corp Vapor generating system in which recirculated flue gases are injected into the combustion air stream of a steam generator
US4751910A (en) * 1987-03-02 1988-06-21 American Standard Inc. Flue gas/combustion air heat exchanger

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495550A (en) * 1944-05-26 1950-01-24 Tech Studien Ag Operating gas heater for thermal power plants
US2737930A (en) * 1949-04-16 1956-03-13 Babcock & Wilcox Co Vapor generating and superheating method and apparatus
US2886013A (en) * 1951-08-23 1959-05-12 Babcock & Wilcox Co Vapor generating, superheating, and reheating method and apparatus therefor
US3892191A (en) * 1974-05-13 1975-07-01 Foster Wheeler Corp Vapor generating system in which recirculated flue gases are injected into the combustion air stream of a steam generator
US4751910A (en) * 1987-03-02 1988-06-21 American Standard Inc. Flue gas/combustion air heat exchanger

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