CA2799648A1 - Natural draft combustion mixer - Google Patents
Natural draft combustion mixer Download PDFInfo
- Publication number
- CA2799648A1 CA2799648A1 CA2799648A CA2799648A CA2799648A1 CA 2799648 A1 CA2799648 A1 CA 2799648A1 CA 2799648 A CA2799648 A CA 2799648A CA 2799648 A CA2799648 A CA 2799648A CA 2799648 A1 CA2799648 A1 CA 2799648A1
- Authority
- CA
- Canada
- Prior art keywords
- orifice
- mixer
- primary air
- natural draft
- fuel
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/66—Preheating the combustion air or gas
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Abstract
A natural draft combustion mixer in which the primary air intake is positioned downstream from the point of fuel introduction, consists of a heat return port for orifice freeze protection that is located adjacent to the orifice, as well as a removable orifice holder for ease of access to the orifice during maintenance and set-up of the combustion system.
Description
Early Filing Date Patent Application This is a formal request for an Early Filing Date Natural Draft Combustion Mixer BACKGROUND OF INVENTION
A natural draft combustion mixer is a device that is utilized in processes where heat is required and achieved by means of heat release from the combustion reaction of fuel and air in a combustion chamber. The mixer is used to perform the mixing of the fuel and air to achieve a mixture above the LEL (lower explosive limit) and below the UEL (upper explosive limit). The primary air shutter is used to control the amount of air that is entering the mixer to attain the required combustion properties. An orifice, of various sizes depending on capacity requirements, is used to calculate the actual volume of fuel per unit time that passes through from a point of predetermined pressure to an area of atmospheric pressure. It is also the point where the well known physics principle of high velocity creating a low pressure area is used to cause atmospheric pressure to push air into the mixer or induce air. The mixture exits through a nozzle at which point the ignition actually occurs and the combustion reaction takes place.
Traditionally, the primary air shutter has been located at a point upstream from the point of fuel introduction. Thus, the flow of cold primary air must pass by the orifice and, as a result, strips heat away from the orifice. The orifice is prone to freezing due to the varying composition/water content of the fuel being used in conjunction with the pressure drop that occurs at this point. In order to change the capacity of the mixer, the orifice needs to change in size and/or the pressure adjusted. This typically involves the dismantlement of the mixer assembly to provide access to the orifice.
SUMMARY OF THE INVENTION
The object of this invention is to prevail over the drawbacks relating to prior art in this field as stated above.
The primary air intake has been relocated to a position downstream of the fuel gas point of introduction. Now the stream of fuel leaving the orifice is at its highest velocity, and thus, lowest pressure, at the point of air induction rather than the traditional upstream location. This allows for a greater volume of air, if required, vs a traditional style mixer.
A removable orifice holder has been designed to allow for the removal of only the holder to access the orifice for maintenance and set-up. This allows the rest of the assembly to remain stationary as it is not required to be removed from the combustion chamber.
A port has been positioned adjacent to the orifice location to allow the use of an orifice preheat line to be installed. This port provides a point of entrance for the high temperature, products of combustion (POC) from the mixing chamber into the mixer housing. These POC
can be drawn back and directly across the orifice, using the same physics principle as previously discussed, to further prevent the freeze off issues traditionally encountered.
BRIEF DESCRIPTION OF DRAWINGS
Fig.1 is an exploded view of the mixer assembly with an optional venturi barrel Fig. 2 is a view of all components assembled to form complete mixer DETAILED DESCRIPTION OF INVENTION
With reference to Figs 1-2 the mixer component orientation and construction can be explained.
Fig. 2 shows the location of the fuel inlet to the mixer.
As shown in Fig. 1 the mixer is comprised of three mandatory separate components with an optional component that will assist in the mixing of the fuel if required. The main mixer body 3 contains the port for the preheating of the orifice 4 by utilizing the high temperature POC as well as the port for the orifice holder 1. A portion of the main body 3 has a reduced diameter and four rectangular holes removed from the stock at 90 degrees in an array around the outside diameter. The reduction of diameter allows for the primary air shutter 5 to slide over top of the mixer body 3. The reduced diameter portion of the mixer body 3 and the primary air shutter are of the same length. This is the base for the primary air shutter 5 which also has the same dimensioned four holes removed at a 45 degree offset from the mixer body 3 holes. This allows for the primary air to be adjusted within the completely open and completely closed positions of the shutter. The mixing shutter 5 has the same outside diameter as the mixer body 3 and an internal diameter slightly larger than the outer diameter of the reduced section of the mixer body 3. This allows for the primary air shutter 5 to rotate freely about the center line axis of the mixer. Fig. 2 shows the set screw hole 2 that allows for the primary air shutter to be secured in the desired position and also constrains the degrees of rotation between the completely open and completely closed position of the primary air shutter (3, Fig. 1.). The optional venturi barrel 6 is shown in Fig. 1 and is used to aide in mixing of the air/fuel before the nozzle. Fig. 1 shows the orifice 2 threaded into the orifice holder 1 and is threaded into the port 7 located at the back of the mixer body 3. It is this configuration that allows the orifice holder to be removed from the assembly allowing maintenance or set-up to easily be performed on the orifice without the need to remove the entire mixer asSembly from the combustion chamber.
With reference to Fig. 1, as the fuel passes through the orifice 2, the high velocity gas creates a low pressure area at the primary air shutter 5 thus, inducing air into the mixer body 3. The primary air shutter 3 is rotated to adjust the amount of air entering the mixer, based on the required amount of air needed to attain the desired combustion reaction.
A line, such as a piece of stainless steel tubing, may be connected between the orifice preheat port 4 and the flame front where the POC are produced. As the high velocity fuel enters the mixer, the low pressure created draws high temperature POC down and across the adjacent orifice, effectively heating the orifice well above the temperature at which ice will form.
=
=
A natural draft combustion mixer is a device that is utilized in processes where heat is required and achieved by means of heat release from the combustion reaction of fuel and air in a combustion chamber. The mixer is used to perform the mixing of the fuel and air to achieve a mixture above the LEL (lower explosive limit) and below the UEL (upper explosive limit). The primary air shutter is used to control the amount of air that is entering the mixer to attain the required combustion properties. An orifice, of various sizes depending on capacity requirements, is used to calculate the actual volume of fuel per unit time that passes through from a point of predetermined pressure to an area of atmospheric pressure. It is also the point where the well known physics principle of high velocity creating a low pressure area is used to cause atmospheric pressure to push air into the mixer or induce air. The mixture exits through a nozzle at which point the ignition actually occurs and the combustion reaction takes place.
Traditionally, the primary air shutter has been located at a point upstream from the point of fuel introduction. Thus, the flow of cold primary air must pass by the orifice and, as a result, strips heat away from the orifice. The orifice is prone to freezing due to the varying composition/water content of the fuel being used in conjunction with the pressure drop that occurs at this point. In order to change the capacity of the mixer, the orifice needs to change in size and/or the pressure adjusted. This typically involves the dismantlement of the mixer assembly to provide access to the orifice.
SUMMARY OF THE INVENTION
The object of this invention is to prevail over the drawbacks relating to prior art in this field as stated above.
The primary air intake has been relocated to a position downstream of the fuel gas point of introduction. Now the stream of fuel leaving the orifice is at its highest velocity, and thus, lowest pressure, at the point of air induction rather than the traditional upstream location. This allows for a greater volume of air, if required, vs a traditional style mixer.
A removable orifice holder has been designed to allow for the removal of only the holder to access the orifice for maintenance and set-up. This allows the rest of the assembly to remain stationary as it is not required to be removed from the combustion chamber.
A port has been positioned adjacent to the orifice location to allow the use of an orifice preheat line to be installed. This port provides a point of entrance for the high temperature, products of combustion (POC) from the mixing chamber into the mixer housing. These POC
can be drawn back and directly across the orifice, using the same physics principle as previously discussed, to further prevent the freeze off issues traditionally encountered.
BRIEF DESCRIPTION OF DRAWINGS
Fig.1 is an exploded view of the mixer assembly with an optional venturi barrel Fig. 2 is a view of all components assembled to form complete mixer DETAILED DESCRIPTION OF INVENTION
With reference to Figs 1-2 the mixer component orientation and construction can be explained.
Fig. 2 shows the location of the fuel inlet to the mixer.
As shown in Fig. 1 the mixer is comprised of three mandatory separate components with an optional component that will assist in the mixing of the fuel if required. The main mixer body 3 contains the port for the preheating of the orifice 4 by utilizing the high temperature POC as well as the port for the orifice holder 1. A portion of the main body 3 has a reduced diameter and four rectangular holes removed from the stock at 90 degrees in an array around the outside diameter. The reduction of diameter allows for the primary air shutter 5 to slide over top of the mixer body 3. The reduced diameter portion of the mixer body 3 and the primary air shutter are of the same length. This is the base for the primary air shutter 5 which also has the same dimensioned four holes removed at a 45 degree offset from the mixer body 3 holes. This allows for the primary air to be adjusted within the completely open and completely closed positions of the shutter. The mixing shutter 5 has the same outside diameter as the mixer body 3 and an internal diameter slightly larger than the outer diameter of the reduced section of the mixer body 3. This allows for the primary air shutter 5 to rotate freely about the center line axis of the mixer. Fig. 2 shows the set screw hole 2 that allows for the primary air shutter to be secured in the desired position and also constrains the degrees of rotation between the completely open and completely closed position of the primary air shutter (3, Fig. 1.). The optional venturi barrel 6 is shown in Fig. 1 and is used to aide in mixing of the air/fuel before the nozzle. Fig. 1 shows the orifice 2 threaded into the orifice holder 1 and is threaded into the port 7 located at the back of the mixer body 3. It is this configuration that allows the orifice holder to be removed from the assembly allowing maintenance or set-up to easily be performed on the orifice without the need to remove the entire mixer asSembly from the combustion chamber.
With reference to Fig. 1, as the fuel passes through the orifice 2, the high velocity gas creates a low pressure area at the primary air shutter 5 thus, inducing air into the mixer body 3. The primary air shutter 3 is rotated to adjust the amount of air entering the mixer, based on the required amount of air needed to attain the desired combustion reaction.
A line, such as a piece of stainless steel tubing, may be connected between the orifice preheat port 4 and the flame front where the POC are produced. As the high velocity fuel enters the mixer, the low pressure created draws high temperature POC down and across the adjacent orifice, effectively heating the orifice well above the temperature at which ice will form.
=
=
Claims (3)
1. The relocation of the primary air introduction being downstream of the orifice will prevent heat loss from the orifice due to very cold combustion air passing over and striping valuable heat from the orifice.
2. The relocation of the orifice preheat port, to a position directly adjacent to the orifice, draws high temperature POC directly down and across the orifice which heats the orifice preventing the build-up and accumulation of ice, thus, preventing freeze-off of the orifice.
3. A removable orifice holder that allows the user to perform maintenance or set-up on the orifice without dismantling the assembly and removing it from the combustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2799648A CA2799648A1 (en) | 2013-01-07 | 2013-01-07 | Natural draft combustion mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2799648A CA2799648A1 (en) | 2013-01-07 | 2013-01-07 | Natural draft combustion mixer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2799648A1 true CA2799648A1 (en) | 2014-07-07 |
Family
ID=51163026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2799648A Abandoned CA2799648A1 (en) | 2013-01-07 | 2013-01-07 | Natural draft combustion mixer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2799648A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017056084A1 (en) | 2015-10-01 | 2017-04-06 | David & D Ltd. | Hot air blower and blowing method |
-
2013
- 2013-01-07 CA CA2799648A patent/CA2799648A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017056084A1 (en) | 2015-10-01 | 2017-04-06 | David & D Ltd. | Hot air blower and blowing method |
| EP3352617A4 (en) * | 2015-10-01 | 2019-05-22 | David & D Ltd. | Hot air blower and blowing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20170109 |