AU648565B2 - Direct fired air heating apparatus - Google Patents
Direct fired air heating apparatus Download PDFInfo
- Publication number
- AU648565B2 AU648565B2 AU80292/91A AU8029291A AU648565B2 AU 648565 B2 AU648565 B2 AU 648565B2 AU 80292/91 A AU80292/91 A AU 80292/91A AU 8029291 A AU8029291 A AU 8029291A AU 648565 B2 AU648565 B2 AU 648565B2
- Authority
- AU
- Australia
- Prior art keywords
- air
- burner
- combustion
- flow control
- passage
- Prior art date
- 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
Links
- 238000010438 heat treatment Methods 0.000 title claims description 27
- 238000002485 combustion reaction Methods 0.000 claims description 46
- 239000007921 spray Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- MFRCZYUUKMFJQJ-UHFFFAOYSA-N 1,4-dioxane-2,5-dione;1,3-dioxan-2-one Chemical compound O=C1OCCCO1.O=C1COC(=O)CO1 MFRCZYUUKMFJQJ-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Landscapes
- Air Supply (AREA)
- Regulation And Control Of Combustion (AREA)
Description
648565
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT
ORIGINAL
Applicant(s): SEETAL SPRAY BOOTH PTY LTD Actual Inventor(s): Paul Emil Reichmuth Address for Service: 00
*SS
S..
PATENT ATTORNEY SERVICES 26 Ellingworth Parade Box Hill Victoria 3128 Australia Title: DIRECT FIRED AIR HEATING APPARATUS Associated Provisional Applications: No(s).: The following statement is a full description of this invention, including the best method of performing it known to me/us:- DIRECT FIRED AIR HEATING APPARATUS This invention relates to direct fired air heating apparatus.
Direct fired air heating apparatus is used in many situations, including industrial uses such as in supply of heated air for paint spray booths, or in drying, baking and curing operations. In many applications, the air may desirably be supplied at different temperatures for different operations.
For example, in a spray booth, air may desirably be supplied so as to raise the temperature in the spray booth to say 30'C for G. initial spraying or coating operations. Subsequently, the air o.
temperature may desirably be raised to a much higher level, e.g.
to say 80°C, for a baking operation. The use of gas fired G direct air heating burners in such heating applications is "known. A gas fired burner is designed and calibrated so as to operate at maximum efficiency for a certain constant air flow through the burner. If the air flow through the burner is, for roeo example, reduced, e.g. as may be desired so as to supply air at a higher temperature, the combustion effectiveness or efficiency e can be adversely affected.
One particular problem with changing the air flow through S a direct fired air supply system results from the loss of efficiency and in particular the generation of excessive levels S S of carbon monoxide or carbon dioxide. Fo- example, there is a standard which prescribes that direct fired air heating apparatus for applications where workers may be working within the heated air stream requires that the carbon monoxide output not exceed 7 ppm and the carbon dioxide output not exceed 2,270 ppm. Changing the air flow through a direct fired air heating apparatus can adversely affect the combustion efficiency leading to excessive levels of carbon monoxide and/or carbon dioxide being generated.
It is an object of the present invention to provide a direct fired air heating apparatus which enables maintenance of combustion effectiveness and/or efficiency for different air flows.
It is a further and preferred object of the present invention to provide a direct fired air heating apparatus in which carbon monoxide and carbon dioxide emissions can be maintained at acceptable levels under different air flow conditions.
According to the present invention there is provided a direct fired air heating apparatus including an air passage through which air passes and in which air is heated, a burner located in the passage for heating air directly so that air and combustion products from the burner pass through the air e.
passage, the burner being operative so that a proportion of the 20 air flowing in the passage enters the burner for supporting *o S combustion, the balance of the air flowing past the burner and mixing downstream of the burner with the flow of air and i combustion products from the burner, a main flow control 0. 0.
associated with the air passage and selectively operable to control the total air flow in the air passage so that the heated air output is controllable in heated air volume and air oo temperature, a combustion air flow control associated with tl.i burner, the combustion air flow control being selectively 3 controlled simultaneously with the main flow control so as to maintain an air flow through the burner to increase the balance of the air flowing past the burner relative to the proportion entering the burner upon an increase in total air flow, and vice versa, so as to thereby maintain a predetermined air flow through the burner to maintain combustion effectiveness and efficiency.
0 *2 o* eo o o•« *o o *o Preferably the combustion air flow control is operative to maintain either or both the speed and the pressure of the air entering the burner to support combustion substantially constant.
The combustion air flow control may comprise damper means to control the balance of the air flowing past the burner and so as to maintain substantially constant the speed and pressure of the proportion of air flowing through the burner.
The combustion air flow control and the main flow control are preferably coupled together so as to simultaneously control the proportion of the air flowing through the burner and the
SS
e total air flow through the air passage. The combustion air flow o• S control and the main flow control may be coupled together by a linkage arrangement so that movement of one of the flow controls automatically controls movement of the other flow control in response thereto.
The main flow control may be located within the air ooeeo ••passage downstream of the burner. The main flow control may comprise selectively operable baffle means located within the Q air passage so as to control the air flow through the air passage by selectively varying the area of the air passage open to air flow.
The burner preferably comprises an elongated burner extending across the air passage and leaving unobstructed a proportion of the cross sectional area of the air passage on each side of the elongated burner through which air flows past the burner, the combustion air flow control comprising two baffles, one baffle being located on each side of the burner so as to control the air flowing past the burner at that respective side, the two baffles being coupled together for simultaneous movement so as to simultaneously restrict the flow of air past the burner or to simultaneously allow greater flow of air past the burner.
Possible and preferred features of the present invention will now be described with particular reference to the accompanying drawings. However it is to be understood that the features illustrated in and described with reference to the drawings are not to be construed as limiting on the scope of the invention. In the drawings: Fig. 1 shows schematically a side sectional view of an air G oo heating apparatus according to the present invention, and 0• S Fig. 2 is a view similar to Fig. 1 showing the apparatus adjusted for a lower air flow.
55 e" Referring to the drawings, there is shown an air passage through which air passes and is heated by the burner 11. The air flow through the passage 10 may be caused by air flow means •BOO0: S such as a blower or fan located downstream of the burner. The 555.
burner 11 is shown schematically in cross section and may comprise, for example, an elongated burner which extends transversely across the air passage 10. The burner 11 is *SS. arranged to receive a proportion of the total air flow and to use this proportion for supporting combustion. For example, one suitable type of burner is known as the "Airflo" burner made by Maxon Corporation of Muncie, Indiana, USA. This type of burner includes a central supply manifold 12 through which fuel, particularly gaseous fuel, is supplied, and diverging mixing plates 13 which are perforated to allow air to pass through the plates 13 from the upstream direction to the downstream side of the plates. With this arrangement, the gas is thoroughly mixed with the air passing through the plates 13 and uniform and complete combustion can take place as shown by numeral. 14 in the drawings.
The burner 11 is designed to operate most effectively and efficiency at a predetermined air flow pressure and speed. Iff there are significant variations in the pressure of air passing through the plates 13 or the speed of the air flow through the plates 13, the combustion efficiency deteriorates resulting in deterioration of the emissions of carbon monoxide and/or carbon .:dioxide.
g* :To maintain substantially constant the air flow through :the plates 13, particularly the air flow pressure and speed, the se* apparatus includes the main flow control 20, shown as a series "00-1.5~ fe of movable baffles 21 extending across the passage 10 and which are hinged for movement about their centre lines 22. The baffles 21 are coupled together as shown schematically at 23 so that they all move simultaneously to restrict or to open the passage 10 to air flow. In Fig. 1 the baffles 21 are shown in fee. their fully open position to allow maximum air flow through the passage 10, and in Fig. 2 the baffles are shown in there maximum feeef restricting position 'to allow, say, only 15% of the maximum air 0:60 flow through the passage Coupled to the main control 20 is a combustion air flow control 30 associated with the burner 11. The combustion air flow control 30 comprises two baffles 31, 32 which are located on respective opposite sides of the burner 11 so as to respectively control the air flowing past -the burner on eacn side. The baffles 31, 32 are coupled -together (by means not shown e. g. located externally of the passage 10) so that they are moved to simultaneously restrict the flow of air past the burner 11 (as shown in Fig. 2) or to simultaneously allow greater flow of air past the burner 10 (as shown in Fig. 1).
The baffles 31, 32, even when fully closed as shown in Fig. 2, allow some air -to flow past the edges of the baffles as shown by the reference letters A and B. However, in both the fully open position shown in Fig. 1 and the fully closed position shown in Fig. 2, the burner 11 will receive a proportion of the total air flow in the passage 10 and which passes through the plates 13 to support combustion. By *.:restricting the balance of the air flowing past -the sides of the e..burner 11 by means of the baffles 31, 32, the air entering the **see burner 11 to support combustion can be maintained at a constant pressure and speed.
The main flow control 20 and the combustion air flow control 30 are coupled together for simultaneous movement by coupling means 35. The coupling means 35 is shown schematically sb as a linkage arrangement which functions to automatically *2 control movement of one of the flow controls 20, 30, in response -to movement of the other flow control. The configuration and arrangement of the flow controls and of -the linkage arrangement.
36 enables the maintenance of a predetermined air flow through the burner 10 to support combustion, thereby maintaining combustion effectiveness and efficiency and particularly maintaining the levels of carbon monoxide and carbon dioxide, at acceptable levels regardless of the position of the main flow control 20. That is, for maximum air flow through the apparatus, acceptable combustion product emissions can be maintained and also for minimum air flow through the passage the emitted combustion product concentrations can be maintained at acceptable levels. By restricting the flow of air through the passage, e.g. as shown in Fig. 2, a relatively low total air flow at a relatively high temperature can be supplied, and by allowing greater total air flow through the passage 10, air at a lower temperature can be supplied.
It will be seen that the particular preferred embodiment of the apparatus described and illustrated can enable the maintenance of combustion effectiveness and efficiency for differing total air flows. Also the emission of combustion S* products can be maintained within acceptable standards or at predetermined levels for differing air flows.
It is to be understood that various alterations, modifications and/or additions may be made to the features of the possible and preferred embodiment(s) of the invention as herein described without departing from the scope of the invention as defined in the claims.
2* *5 0
Claims (5)
1. A direct fired air heating apparatus including an air passage through which air passes and in which air is heated, a burner located in the passage for heating air directly so that air and combustion products from the burner pass through the air passage, the burner being operative so that a proportion of the air flowing in the passage enters the burner for supporting combustion, the balance of the air flowing past the burner and mixing downstream of the burner with the flow of air and combustion products from the burner, a main flow control associated with the air passage and selectively operable to control the total air flow in the air passage so that the heated air output is controllable in heated air volume and air temperature, a combustion air flow control associated with the burner, the combustion air flow control being selectively controlled simultaneously with the main flow control so as to maintain an air flow through the burner to increase said balance of the air flowing past the burner relative to the proportion entering the burner upon an increase in total air flow, and vice versa, so as to thereby maintain a predetermined air flow 20 through the burner to maintain combustion effectiveness and efficiency.
2. An air heating apparatus as claimed in Claim 1 wherein the "i00: combustion air flow control is operative to maintain the speed of the air entering the burner to support combustion 25 substantially constant. o* 3. An air heating apparatus as claimed in Claim 1 or 2 wherein the combustion air flow control is operative to maintain the pressure of the air entering the burner to support
07- 9 combustion substantially constant. 4. An air heating apparatus as claimed in any one of the preceding claims wherein the combustion air flow control comprises damper means to control said balance of the air 0* flowing past the burner and so as to maintain substantially constant the speed and pressure of said proportion of air flowing through the burner. An air heating apparatus as claimed in any one of the preceding claims wherein the combustion air flow control and the main flow control are coupled together so as to simultaneously control respectively said proportion of the air flowing through the burner and the total air flow through the air passage. 6. An air heating apparatus as claimed in Claim 5 wherein the combustion air flow control and the main flow control are coupled together by a linkage arrangement so that movement of one of the flow controls automatically controls movement of the other flow control in response thereto. *o* 6, 7. An air heating apparatus as claimed in any one of the preceding claims wherein the main flow control is located within the air passage downstream of the burner.
8. An air heating apparatus as claimed in any one of the preceding claims wherein the main flow control comprises selectively operable baffle means located within the air passage so as to control the air flow through the air passage by selectively varying the area of the air passage open to air Sflow.
9. An air heating apparatus as claimed in any one. of the preceding claims wherein the burner comprises an elongated burner extending across the air passage and leaving unobstructed a proportion of the cross sectional area of the air passage on each side of the elongated burner through which air flows past the burner, the combustion air flow control comprising two baffles, one baffle being located on each side of the burner so S I as to control the air flowing past the burner at that respective side, the two baffles being coupled together for simultaneous movement so as to simultaneously restrict the flow of air past the burner or to simultaneously allow greater flow of air past the burner. A direct fired air heating apparatus substantially as herein before described with particular reference to the accompanying drawings. Dated this 4th day of July, 1991 Pi 0 PATENT ATTORNEY SERVICES Attorneys for SEETAL SPRAY BOOTH PTY LTD 4 a* a ABSTRACT A direct fired air heating apparatus includes an air passage a burner (11) located in the passage for heating air directly. A proportion of the air enters the burner for supporting combustion and the balance of the air flows past the burner. Main flow control baffles (21) control the total air flow. Combustion air flow control baffles (31, 32) are associated with the burner and are selectively controlled simultaneously with the main flow control baffles (21) so as to maintain a constant air flow speed and pressure through the burner (11) to maintain combustion effectiveness and efficiency. *o c. t
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU80292/91A AU648565B2 (en) | 1991-07-10 | 1991-07-10 | Direct fired air heating apparatus |
| NZ243459A NZ243459A (en) | 1991-07-10 | 1992-07-06 | Direct fired air heating apparatus, having controls for airflow and temperature variation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU80292/91A AU648565B2 (en) | 1991-07-10 | 1991-07-10 | Direct fired air heating apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU8029291A AU8029291A (en) | 1993-01-21 |
| AU648565B2 true AU648565B2 (en) | 1994-04-28 |
Family
ID=3759528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU80292/91A Expired AU648565B2 (en) | 1991-07-10 | 1991-07-10 | Direct fired air heating apparatus |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU648565B2 (en) |
| NZ (1) | NZ243459A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0309034A1 (en) * | 1987-09-15 | 1989-03-29 | Flameco-Eclipse B.V. | Gas burner |
-
1991
- 1991-07-10 AU AU80292/91A patent/AU648565B2/en not_active Expired
-
1992
- 1992-07-06 NZ NZ243459A patent/NZ243459A/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0309034A1 (en) * | 1987-09-15 | 1989-03-29 | Flameco-Eclipse B.V. | Gas burner |
Also Published As
| Publication number | Publication date |
|---|---|
| AU8029291A (en) | 1993-01-21 |
| NZ243459A (en) | 1995-04-27 |
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