WO1983000735A1 - Appareil de chauffage par chaleur radiante - Google Patents

Appareil de chauffage par chaleur radiante Download PDF

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Publication number
WO1983000735A1
WO1983000735A1 PCT/US1981/000210 US8100210W WO8300735A1 WO 1983000735 A1 WO1983000735 A1 WO 1983000735A1 US 8100210 W US8100210 W US 8100210W WO 8300735 A1 WO8300735 A1 WO 8300735A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
fuel gas
regenerator
air
cores
Prior art date
Application number
PCT/US1981/000210
Other languages
English (en)
Inventor
John M Bailey
Original Assignee
Bailey, John, M.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bailey, John, M. filed Critical Bailey, John, M.
Priority to PCT/US1981/000210 priority Critical patent/WO1983000735A1/fr
Publication of WO1983000735A1 publication Critical patent/WO1983000735A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/122—Arrangement or mounting of control or safety devices on stoves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F23L15/02—Arrangements of regenerators
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Definitions

  • This invention relates to a radiant heating apparatus, and more particularly to a heating apparatus employing a radiant heating tube and a regenerator system.
  • Regenerative heat exchangers and recuperators have been commonly used in high temperature furnaces such as glass furnaces (Bradley et al U.S. Patent 4,174, 948), open hearth furnaces (Tourville U.S. Patent 2,046 419), and coke ovens (Otto U.S. Patent 2,868,277). See also Webber U.S. Patent 3,223,135, which refers to the common practice of cyclically reversing the flow of air and the supply of fuel to burners so that, after one half cycle when the furnace is first started up, the combustion air always passes over hot regenerator ele ⁇ ments. More recently, regenerative heat exchangers have been used in gas turbine engines (Penney et al U.S. Patent 3,978,912) .
  • regenerator of U.S. Patent 3,978,912 was especially engineered for use in automotive gas turbine engines, and thus had to be quite compact.
  • Regenerators used in furnaces have generally been large and required substantial, heavily insulated regen ⁇ erators outside the furnace chamber. Such structures are not acceptable in modern manufacturing facilities where space is at a premium, and where furnaces must be used for such purposes as heat treating metal parts.
  • recuperator or regenerator system applicable to such furnaces that does not greatly increase the space occupied by the furnace.
  • a radiant heating apparatus is of the type which has walls defining a chamber to be heated, a tube in the chamber with first and second end portions extending through the chamber wall, a fluid fuel burner in the tube, air inlet means through which combustion air is supplied to the burner, and combustion gas outlet means through which combustion products from the tube pass.
  • the apparatus is supplied with a regenerator system which has first and second regenerator cores in the first and second end portions of the tube, and each of the regenerator cores has a large surface area over which gases may flow freely.
  • First and second fluid fuel burners are immediately adjacent the inner ends of the respective first and second regenerator cores, and cycling means of the gen ⁇ eral type discussed in the Webber patent is provided to control airflow and combustion.
  • the cycling means causes air from the inlet means to flow through the first regenerator core and fuel to be supplied only to the first fluid fuel burner to operate that burner, thereby producing hot combustion products which heat the second regenerator core as they pass to the stack.
  • the cycling means then causes the air from the inlet means to flow through the heated second regenerator core and fuel to be supplied only to the second fluid fuel burner to operate that burner, thereby producing hot combustion products which heat the first regenerator core as they pass to the stack.
  • Fig. 1 is a fragmentary sectional view of a first embodiment of a radiant heating apparatus supplied with the regenerative system of the present invention
  • Fig. 2 is a fragmentary sectional view taken substantially as indicated along the line II-II of Fig. 1;
  • Fig. 3 is a fragmentary sectional view of a second embodiment of the invention.
  • Fig. 4 is a fragmentary sectional view of a third embodiment of the invention designed particularly for use with low BTU producer, or coal gas;
  • Fig. 5. is a diagrammatic view of the cycling means which controls airflow and combustion.
  • a radiant heating apparatus 8 includes a heavy upright furnace wall, indicated generally at 10 which cooperates with an end wall 11 and with four other walls (not shown) to define a radiant heating furnace chamber 12.
  • the walls are all of about the same thickness, which may be from about 22.85 to 30.50 cm. (9" to 12"), so the chamber 12 is heavily insulated to suffer minimum heat loss.
  • the furnace chamber 12 may be used for heat treating metal
  • a U-tube, indi- cated generally at 13 has a first end portion 14 and a second end portion 15 which extend through the furnace - wall 10 in spaced relationship to one another. As seen in Figs. 3 and 4, the U-tube 13 extends a substantial distance into the chamber 12; and a large capacity fur- nace will be supplied with a series of U- ubes 13, all of which extend through the wall 10 in parallel, spaced relationship to one another.
  • the U-tubes supply radiant heat to the furnace chamber 12, and are essentially conventional in this type of apparatus.
  • the extreme outer ends of the U-tube are pro ⁇ vided with flanges 14a and 15a by means of which the U-tube is secured to an air box, indicated generally at 16.
  • the air box 16 has an inner wall 17 and an outer wall 18 which are parallel to the furnace wall 10, having end plates 19 and 20.
  • a side wall 21 contains an air inlet opening 22, while a side wall 23 has an opening 24 which communicates with a venting stack 25.
  • the air inlet opening 22 and the air box 16 provide com ⁇ bustion air inlet means.
  • a throat 26 between the air inlet opening 22 and the outlet opening 24 is intersected by a shaft 27 which has one end supported in a bearing 28 mounted upon the wall 17 and the other end projecting through the wall 18 and provided with a drive gear 29.
  • Mounted upon the shaft 27 is a butterfly valve 30 which may be rotated between the full line position of Fig. 2 and the broken line position of Fig. 2 so as to reverse the airflow from the air inlet 22 through the U-tube 13 to the vent
  • reversible movement of the butterfly valve 30 may conveniently be provided by a reversible electric motor 31 on the shaft of which is a gear 32 that is in driving engagement with the gear 29 on the butterfly valve shaft 27; although other suitable means such as a hydraulic motor or a hydraulic cylinder may be used.
  • the shaft 27 and the corresponding shafts for other butterfly valves may be provided with dual sprockets so that a single reversible motor may operate all the butterfly valves 30 through a system of driving chains, or electro-pneumatic, or direct solenoid actuator means, as is well known in the art.
  • the end portion 14 of the U-tube is provided with a first regenerator core, indicated generally at 33; while the second end portion 15 of the U-tube is provided with a second regenerator core, indicated generally at 34.
  • the first and second regenerator cores are identical in construction, so only the core 34 is described in detail and like reference numerals are applied to the components of the two cores.
  • Each regenerator core consists of a plurality of annular segments 35 which are separated by spacers 36,
  • OMPI fa WIPO and the regenerator cores surround a fuel gas tube 37 which has an igniter 38 at its outer end.
  • Struts 39 are secured to the air box wall to support the gas tubes 37, and regenerator core segments 35 and the spacers 36.
  • Fuel gas lines 40 extend into the air box and connects with gas tubes 37.
  • Each regenerator segment 35 is preferably of a suitable spiral metal or ceramic honeycomb construc ⁇ tion, or might consist of packed stainless steel wire, porous metal or ceramic material in a configuration which does not materially impede the flow of air or combustion products through the U-tube.
  • the fuel gas tubes 37 may, as is known in the art, be of ceramic or ultra-high temperature metal alloy.
  • the regenerator cores 33 and 34 fit almost entirely within the thickness of the furnace wall 10, so that additional insulation is not required to avoid heat loss from the regenerators.
  • location of the regenerators within the end portions of the U-tube 13 greatly reduces the temperature of exhaust air passing to the venting stack 25, and makes it unnecessary to use high temperature materials except for the U-tube, the regenerator cores, and the gas tubes.
  • the absorption of heat by the innermost regenerator segments 35 causes the outermost segments to be heated to a lesser extent, and thus may permit the use of less expensive materials for the more outer segments. Segmenting of the cores regardless of the material may be advantageous to reduce the adverse affects on heat transfer due to axial thermal conduction.
  • the combustion is shifted cyclically between the first and second ends 14 and 15 of the U-tube 13, and the shift may be on a time cycle based upon the minimum time re ⁇ uired to heat the - 7 -
  • regenerator cores to a desired temperature; or cycling may be controlled by thermal responsive means immediately associated with the two regenerator cores.
  • a simple control system is illustrated in Fig. 5, but since the control system is applicable to the apparatus of Figs. 3 and 4 as well as to the apparatus of Fig. 1, it will be described in detail only after the devices of Figs. 3 and 4 are described.
  • FIG. 3 the apparatus is like that of Figs. 1 and 2 except for the air box structure and the valve arrangement for shifting the flow of inlet air and combustion gases to one end portion or the other of the U-tube 13. Accordingly, much of the structure of Fig. 3 is not described in detail, but like reference numerals are applied to those components which are the same as those in Fig. 1.
  • an air box indicated generally at 116, has a wall 117 immediately adjacent and parallel to the furnace wall 10, and has an outer wall 118 which is provided with a first set of air inlet openings 119 opposite the U-tube end portion 14 and a second set of air inlet openings 120 opposite the second end portion 15 of the U-tube.
  • An air supply duct 121 supplies combustion air to one or the other of the gas burners in the end portions of the U-tube, either through the openings 119 or the openings 120.
  • the air box wall 118 is also provided with a first set of exhaust openings 122 for combustion gases, and the exhaust openings 122 are operatively associated with the end portion 15 of the U-tube.
  • a second set of exhaust openings 123 in the wall 118 is operatively associated with the end portion 14 of the U-tube.
  • Control of the flow of combustion air and combustion gases is by means of a flat reciprocable valve slide plate 126 which has a first set of air inlet orifices 127 which are illustrated in Fig. 3 in align ⁇ ment with the air holes 119 in the air box wall 118; and the sliding plate valve 126 also has a second set of air inlet orifices 128 which, in Fig. 3, are out of align ⁇ ment with the second set of air holes 120 in the wall 118 so that combustion air from the duct 121 may enter only the end portion 14 of the U-tube.
  • the slide valve plate 126 also has a first set of combustion gas outlet orifices 129 which, in Fig. 3, are aligned with the exhaust openings 122 in the air box wall 118; while a second set of combustion gas outlet orifices 130 is out of alignment with the exhaust open ⁇ ings 123 of the wall 118.
  • exhaust gases from the end portion 15 of the U-tube pass through the orifices 129 and the holes 122 into the vent stack 124.
  • a damper 131 in the stack 124 which may be adjusted to control the rate of flow of air through the 5. system; and a similar damper is in the system of Fig. 1, although not illustrated.
  • the damper may be closed to conserve heat in the furnace when the burners are off.
  • the apparatus of Fig. 4 constitutes a odifi- cation of the apparatus of Fig. 3 to make it suitable for use with low BTU producer, or coal gas.
  • the ratio of combustion air mass flow to coal gas mass flow may be only about 1.3:1.
  • a very large quantity of coal gas is required, and to achieve any meaningful reduction in fuel usage it is necessary to preheat both the inlet air and the coal gas.
  • the inlet air and the coal gas are preheated to about 1500° F. , it is necessary to keep them separate until they are both in the combustion device in the U-tube 13 to prevent premature autoignition.
  • regenerator cores 233 and 234 are cylin ⁇ drical, rather than annular, because no separate gas tube is employed.
  • An air box 216 is broadly similar to the air box 116, but has an outer wall 218 which is somewhat differently arranged because of the difference in other components of the system.
  • a gas manifold pipe 210 has branch pipes 211 and 212 which extend through the air box wall 218 in alignment, respectively, with the longitudinal axes of the respective regenerator cores 233 and 234.
  • a partition 225 in the air box divides it into upper and lower sections, and thus performs the same function as the partition 125 in the apparatus of Fig. 3.
  • a slide plate type valve 226 has a first set of air inlet holes 227, of which one is shown in alignment with the air inlet opening 219. The opposite end of the slide plate valve 226 is short enough that when the valve is shifted upwardly in Fig. 4 to close off the air openings 219, the end 228 of the valve plate 226 uncovers the second set of air inlet openings 220.
  • the valve plate 226 is also provided with a first fuel gas inlet opening 232, and a first fuel gas director tube 232a is secured to the plate valve 226 in register with the fuel gas opening 232 so that when the opening 232 is aligned -with the fuel gas branch pipe 211, as seen in Fig. 4, gas from the director tube 232a passes immediately into the regenerator core 233.
  • a second fuel gas opening 235 in the plate valve 226 is illustrated as being out of alignment with the branch fuel gas pipe 212, so that there is no flow of gas from that branch pipe.
  • the air box wall 218 is also provided with a first purge air slot 236 and with a second purge air slot 237 which communicate with the air manifold 221 so that, as the slide valve 226 is moved from the position of Fig. 4 to a position in which the gas line 212 is open, the gas director tube 232a is momentarily aligned with the purge slot 236 so as to blow residual gas from the director tube into the regenerator core 233. Simi ⁇ larly, as the plate valve 226 is being returned to the position of Fig. 4, the gas director tube 235a is momentarily aligned with the purge slot 237 so that residual gas in the director tube 235a is blown into the regenerator core 234.
  • the valve plate 226 also has a first exhaust gas orifice 229 which, in Fig. 4, is aligned with the exhaust gas opening 222 of the wall 218; and a second exhaust gas orifice 230 is out of alignment with the gas exhaust opening 223 of the wall 218.
  • a first exhaust gas orifice 229 which, in Fig. 4, is aligned with the exhaust gas opening 222 of the wall 218; and a second exhaust gas orifice 230 is out of alignment with the gas exhaust opening 223 of the wall 218.
  • one gas exhaust orifice 231 in the valve plate 226 may be aligned either with an exhaust gas opening 222 or with an exhaust gas opening 223.
  • regenerator cores 233 and 234 are such that they provide uninterrupted, separate passages, as seen in the core 234.
  • fuel gas from the director tubes 232a and 235a enters only those passages 234a which are aligned with it, while combustion air enters only the passages 234b which surround those through which the fuel gas passes; and there is no mix ⁇ ing of fuel gas and air within the regenerator cores which could cause premature ignition.
  • the exhaust gas flows through all the regenerator core passages.
  • Conventional ignition devices 238 are illustrated at the inner ends of the respective cores 233 and 234, and electric leads 239 for the igniters 238 extend through one (or more) of the air passages, such as a passage 234b. Such ignition devices may rarely be needed because the entering fuel gas and combustion air often are initially hot enough for autoignition.
  • the diameters of the director tubes 232a and 235a relative to the regenerator cores 233 and 234 are selected as a function of the required air/fuel ratio for any particular fuel gas.
  • the diameter of the fuel gas director tubes 232a and 235a bear a predetermined relationship to the diameter of the regenerator cores 233 and 234, so as to provide equal temperature rise for the gas and air through the regenerator core.
  • the diameter of the director tubes is increased, there are more passages 234a devoted to transmitting fuel gas, and fewer passages 234b in the surrounding annular area devoted to transmitting air.
  • changes in the diameter of the director tubes may adapt the apparatus to use with gaseous fuels having a wide variety of BTU outputs. -13-
  • Fig. 5 illustrates a suitable control circuit, indicated generally at 299, for actuating the valves of the regenerator system, and for also controlling fuel gas flow to the gas pipes 40 of the first two embodiments of the invention so that combustion takes place at the desired end portion of the U-tube 13.
  • the illustrated circuit is time controlled.
  • An oscillator 300 forms an input to a divide-by-N counter 301 which counts the pulses developed by the oscillator 300 and provides an output pulse when N pulses have been accumulated.
  • the frequency at which the output pulses are developed by the counter 301 is determined by the frequency of the oscillator 300, and by the value chosen for the variable N.
  • the output pulse from the divide-by-N counter 301 is coupled to a T flip-flop 302, the output of which changes state each time an input pulse is received.
  • the output from the T flip-flop 302 functions through a driving circuit 303 to energize a coil 304, which in turn drives an armature 305 to control the driving means for the valve 30, 126, or 226; and also to operate conventional gas valves for the lines 40.
  • a feedback line 306 couples the output signal from the counter 301 back to its reset input to reinitate counting of the pulses developed by the oscillator.
  • a temperature sensing based switching network may be utilized to energize the coil 304 in response to temperatures within the system.
  • a thermocouple or thermistor preferably located at the exit of each regenerator core, may be used in a conventional circuit to provide switching of the coil 304 between energized and deenergized states when the temperature reaches a predetermined value.
  • a thermocouple or thermistor may also be used to sense excessive temperature and activate a safety shut-off, as is well known in the furnace art.
  • the regenerator system of the present invention may be utilized in any radiant heating apparatus of a type in which combustion occurs within the furnace in a radiant heating tube, even though the tube, in some cases, may not be a U-tube.
  • a non-U-tuoe type furnace would, of course, require modification of the valving arrangements; but the same principle could be employed.
  • the principal purpose of employing a regenerator system is to reduce fuel requirements. Based upon experience with other types of regenerator systems, the apparatus of the present invention may permit fuel savings of the order of 50 per cent.
  • the present invention provides a regenerator system for radiant heat furnaces which require very little increase in the space occupied by tfte furnace; and the reduced temperature of the exhaust gases eliminates the need for any high temperature alloys outside the furnace proper. Stack temperatures can be of the order of 600° F.
  • regenerator segments are low in cost and simple, because no separation of gas or air is required in the heat exchanger proper (unlike recuperators) .
  • regenerator segments are shown spaced apart by spacers, the spacers can be eliminated so tne segments are stacked on top of each other.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

Un appareil de chauffage radiant du type ayant un tube de chauffage (13) à l'intérieur (14), (15) d'une ouverture extérieure à la chambre de four (12), possède un premier et un second noyau régénérateur (33), (34) dans une première et une seconde extrémités opposées du tube (14), (15), et un premier et un second brûleur de combustible fluide (37), (38) dans le tube (13) aux extrémités internes du premier et du second noyau (33), (34), respectivement. Une commande cyclique (30), (299) fait en sorte que l'air d'admission entre dans la première extrémité (14) du tube (13) tandis que le premier brûleur (37), (38) fonctionne, et sorte au travers de la seconde extrémité (15) du tube (13), chauffant ainsi le second noyau (34). Ensuite, la commande cyclique (30), (299) fait en sorte que l'air d'admission s'écoule au travers du second noyau chauffé (34), tandis que le second brûleur de combustible (37), (38) fonctionne, chauffant ainsi le premier noyau (33); l'unité continue de chauffer les noyaux régénérateurs de manière alternée.
PCT/US1981/000210 1981-02-17 1981-02-17 Appareil de chauffage par chaleur radiante WO1983000735A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1981/000210 WO1983000735A1 (fr) 1981-02-17 1981-02-17 Appareil de chauffage par chaleur radiante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1981/000210 WO1983000735A1 (fr) 1981-02-17 1981-02-17 Appareil de chauffage par chaleur radiante

Publications (1)

Publication Number Publication Date
WO1983000735A1 true WO1983000735A1 (fr) 1983-03-03

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PCT/US1981/000210 WO1983000735A1 (fr) 1981-02-17 1981-02-17 Appareil de chauffage par chaleur radiante

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WO (1) WO1983000735A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944674A (en) * 1988-11-08 1990-07-31 British Gas Plc Apparatus for heating a vessel
GB2195011B (en) * 1986-08-02 1990-12-12 Stordy Combustion Eng Method of supplying heat and burner for use in the method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2399609A (en) * 1941-10-11 1946-04-30 Titanium Alloy Mfg Co Furnace
US2946651A (en) * 1956-08-09 1960-07-26 Oxy Catalyst Inc Catalytic treatment of gas streams

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2399609A (en) * 1941-10-11 1946-04-30 Titanium Alloy Mfg Co Furnace
US2946651A (en) * 1956-08-09 1960-07-26 Oxy Catalyst Inc Catalytic treatment of gas streams

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2195011B (en) * 1986-08-02 1990-12-12 Stordy Combustion Eng Method of supplying heat and burner for use in the method
US4944674A (en) * 1988-11-08 1990-07-31 British Gas Plc Apparatus for heating a vessel

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