CA2004412C - Exhaust treating apparatus - Google Patents
Exhaust treating apparatusInfo
- Publication number
- CA2004412C CA2004412C CA 2004412 CA2004412A CA2004412C CA 2004412 C CA2004412 C CA 2004412C CA 2004412 CA2004412 CA 2004412 CA 2004412 A CA2004412 A CA 2004412A CA 2004412 C CA2004412 C CA 2004412C
- Authority
- CA
- Canada
- Prior art keywords
- voltage
- electrodes
- chamber
- secondary winding
- gap
- 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 - Fee Related
Links
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
A DC voltage source connected through an input terminal to the primary winding of an ignition transformer is constantly loaded by connection through an output terminal to a directly grounded secondary winding. The windings are connected through the output terminal to one electrode of a spark plug, the other electrode as well as the spark gap being exposed to a grounded, moisture-laden body of exhaust products that are intermittently ignited by electrical discharge across the spark gap.
Description
p EXHAUST TREATING APPARATUS
This invention relates in general to treatment of exhaust gases or the like, and is an improvement over the electrical ignition devices for trsating exhausts as disclosed in my prior U.S. Patent Nos. 3,902,854 and 4,163,772, respectively issued September 2, 1975 and August 7, 1979. ~
In the foregoing type of electrical ignition devices, the exhaust gases being treated are conducted through a chamber mixed with moisture to control the electrical conductivity of the exhaust. A spark plug in the chamber intermittently ignites the moisture laden exhaust mixture by means of arcs produced across the gap between electrodes by peak voltage output of a transformer or ignition coil device powered from a DC source of voltage.
According to my earlier patent, peak voltagQs are produced by timed operation of an interrupter switch through which the voltage source is connected across the primary winding of the transformer device. According to my later patent, the interrupter switch i replaced by connection of the primary winding to a current control terminal exposed to the moisture laden mixture in the grounded chamber through which voltage fluctuation across the primary winding is controlled by the conductivity of the exhaust mixture.
In accordance with the present invention, the primary and secondary windings of the ignition transformer device are directly interconnected in series between negative ground and the DC source of ~oltage upon closing of the ignition switch. The interconnection of the primary and secondary windings is established at a juncture constituting an output terminal of the tran~former device to which one electrode o~ the spark plug is connected, the O~
other electrode being exposed to the exhaust mixture in the exhaust treating chamber which i5 electrically grounded.
Moisture laden exhaust of variable electrical conductivity accordingly comple~es a circuit through the windings in parallel with the constant loading path established to negative ground in order to produce a ~luctuating voltage having a voltage peak which causes arcing across the gap ~etween spark plug electrodes. The arcing ignites the exhaust mixture resulting in a combustion type of reaction causing an abrupt change in the conductivity of the mixture.
The moisture content of the exhaust mixture as well as the composition of the exhaust thereby automatically control the frequency of ignition dischargs across the electrode gap without any interrupter switch action to reactively treat the exhaust and reduce its polluting affect in a unique and efficient manner.
Embodiments of the present inventlon will be described with reference to the accompanying drawings, wherein like num~rals refer to like parts, in which:
Figure 1 i5 a side sectional view through an exhaust treating apparatus in accordance with one emhodiment of the invention;
Figure 2 is a schematic illustration of the exhaust treating sy~tem associated with the apparatus shown in Figure 1;
Figure 3 is a partial side sectional view of an exhaust treating apparatus in accordance with another embodiment of the invention;
Figure 4 is a diagram of an equivalent circuit corresponding to the embodiments of Figures 1-3; and Figure 5 is a partially schematic illustration of a stationary power generating installation for the present invention.
Referring now to the drawings in detail, Figure 1 illustrates one embodiment of exhaust treating apparatus associated with an automotive vehicle installation, generally referred to by reference numeral 14. Fuel combustion product exhaust from the vehicle engine enters a metallic housing 18 of the apparatus through an inlet conduit section 20. The housing is electrically grounded and encloses a flow stream chamber 22 from which a fluent mixtur~ exits through an outlet conduit section ~4. The inlet and outlet conduit sections are respectively mounted on end walls 12 and 16 of the housing at opposite axial ends thereof. A restricted air inlet port 26 is formed in end wall 12 while a water drain port 28 is formed in end wall 16. The fluent mixture in chamber 22 is formed by the inflow of exhaust through inlet 20, inflow of moisture laden air through port 26 and intermittent reaction produced by a reaction generating unit 30 mounted on the end wall 12 within the housing chamber 22.
The unit 30 includes an electrically non-conductive housing 32 having a mounting flange 34 at one axial end secured to the housing end wall 12 by means of an annular retainer 36 and fasteners 38. The inner axial ~nd of the housing 32 threadedly mounts a conven~ional type of automotive engine spark plug 40 with the spaced electrodes thereof projecting into the chamber 22. The spark plug i5 in electrical contact with an ou~u~ terminal 42 of an ignition coil or transformer device 44 ~ixedly held in housing 32 in abutment with the mounting flange 34. An input terminal 46 of the ignition coil device ~4 is electrically connected to a source of DC voltage through conductor 48, positive terminal 50 and conductor 55 in the embodiment of Figure 1 as shown. A third terminal 52 of the coil device is directly connected to fixed negative ground through a ground connection 54.
As diagrammed in Figure 2, the electrodes 56 and 58 of the spark pl~g 40 form a current path through the mixture in chamber 22 to ground so as to act as a "breaker"
causing fluctuation of the current conducted through the electrode gap 60 in series with the primary and secondary windings 62 and 64 of the transformer device 44. The electrical conductivity of the mixture, to which the gap 60 is exposed, will also control the current conducted from the DC voltage source at the input terminal 46 of the transformer 44 through its primary winding 62. The moisture laden mixture in chamber 22 and its conductivity in the electrode gap 60 are therefore the equivalent of series connected variable loading resistors connected to ground in series with the parallel connected windings 62 and 64 of the transformer 44 as diagrammed in the equivalent circuit shown in Figure 4. The secondary winding 64 is also directly connected to ground at terminal 52 and in series with the primary winding 62 through a juncture forming the output terminal 42. The DC voltage source is derived from a battery 66 havlng a negative ground 68 and a positive output applied through ignition switch 70 to the input terminal 46 of the primary winding 62.
It will become apparent from the foregoing dascription that closing of switch 70, will constantly load the battery by applying its DC voltage across the primary and secondary windings interconnected in series by the juncture of the output terminal 42 directly to fixed ground at ground terminal 52. Assuming an initial substantially 2~
zero electrical conductivity in gap 60~ a relatively lo-~volt drop will then occur across the primary winding. As the moisture in chamber 22 and the conductivit~ of gap 60 increases toward low resistance values, the voltage across the primary winding increases toward full battery volta~e.
Accordingly, variation of the conductivity of the mixture in chamber 22 will produce a fluctuating voltage across the primary winding 62 to induce a higher fluctuating voltage across the secondary winding 64 disposed in inductive relation to the primar~ winding in a voltage step-up transformer configuration of device 44. The voltage induced in the secondary winding is applied through output terminal 42 across the electrode gap 60 and when it approaches a peak level, a spark is generated to ignite ~he mixture and produce a reaction. The reaction causes a sudden change in mixture conductivity. Mixture reactive ignition will therefore occur in a cyclic manner, affected in magnitude and ~requency by variation in moisture content of the inflowing air and variation in fuel combustion.
A modified arrangement is shown in Figure 3 which is basically the same circuit-wise as shown in Figure 2.
The spark plug 40 is mounted in a separate metallic enclosure 72 on the end wall 12' through which electrode 58 is grounded. Accordingly, the other electrode 56 is electrically connected by a conductor 74 to the output terminal 42 of transformer ~4 enclosed in its non-conductive housing 32'. The ground te, ;n~l 52 is also connected to negative ground by conductor 54 while input terminal 46 is directly connected to DC voltage conductor 55 from the battery switch.
The battery 66 and switch 70 may form part of the usual ignition circuit associated with an automotive vehicle installation so that the vehicle installation embodiments described will provide exhaust gas treatment for pollution ~3~
reducing purposes. The spar~ plug 40 not only serves to vary combustion completing reactions as a function of the variables aforementivnedl but also serves as a "breaker" to enable the transformer 44 to induce the reaction generating voltage.
The invention as hereinbefore described is also applicable to stationary indu~strial installations to perform exhaust gas treatment as referred to in my prior U.S.
patents aforementionedO For example, combustion products exhausted from the top of a steam generator 76 of a power plant may be treated by passage through an-exhaust gas - treatin~ chamber 78 as diagrammatically shown in Figure 5.
The flow of exhaust from the steam generator through chamber 78 to the smoke stack 80 is induced by a draft fan 82 while aerosol water is introducPd into chamber 78 by a spray device 84 under control of input sensors to regulate the moisture content of the exhaust mixture being treated. A
reaction generating unit 30' is mounted in the chamber 78 and operates in a manner similar to unit 30 hereinbefore described.
The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, fallin~ within the scope of the invention.
This invention relates in general to treatment of exhaust gases or the like, and is an improvement over the electrical ignition devices for trsating exhausts as disclosed in my prior U.S. Patent Nos. 3,902,854 and 4,163,772, respectively issued September 2, 1975 and August 7, 1979. ~
In the foregoing type of electrical ignition devices, the exhaust gases being treated are conducted through a chamber mixed with moisture to control the electrical conductivity of the exhaust. A spark plug in the chamber intermittently ignites the moisture laden exhaust mixture by means of arcs produced across the gap between electrodes by peak voltage output of a transformer or ignition coil device powered from a DC source of voltage.
According to my earlier patent, peak voltagQs are produced by timed operation of an interrupter switch through which the voltage source is connected across the primary winding of the transformer device. According to my later patent, the interrupter switch i replaced by connection of the primary winding to a current control terminal exposed to the moisture laden mixture in the grounded chamber through which voltage fluctuation across the primary winding is controlled by the conductivity of the exhaust mixture.
In accordance with the present invention, the primary and secondary windings of the ignition transformer device are directly interconnected in series between negative ground and the DC source of ~oltage upon closing of the ignition switch. The interconnection of the primary and secondary windings is established at a juncture constituting an output terminal of the tran~former device to which one electrode o~ the spark plug is connected, the O~
other electrode being exposed to the exhaust mixture in the exhaust treating chamber which i5 electrically grounded.
Moisture laden exhaust of variable electrical conductivity accordingly comple~es a circuit through the windings in parallel with the constant loading path established to negative ground in order to produce a ~luctuating voltage having a voltage peak which causes arcing across the gap ~etween spark plug electrodes. The arcing ignites the exhaust mixture resulting in a combustion type of reaction causing an abrupt change in the conductivity of the mixture.
The moisture content of the exhaust mixture as well as the composition of the exhaust thereby automatically control the frequency of ignition dischargs across the electrode gap without any interrupter switch action to reactively treat the exhaust and reduce its polluting affect in a unique and efficient manner.
Embodiments of the present inventlon will be described with reference to the accompanying drawings, wherein like num~rals refer to like parts, in which:
Figure 1 i5 a side sectional view through an exhaust treating apparatus in accordance with one emhodiment of the invention;
Figure 2 is a schematic illustration of the exhaust treating sy~tem associated with the apparatus shown in Figure 1;
Figure 3 is a partial side sectional view of an exhaust treating apparatus in accordance with another embodiment of the invention;
Figure 4 is a diagram of an equivalent circuit corresponding to the embodiments of Figures 1-3; and Figure 5 is a partially schematic illustration of a stationary power generating installation for the present invention.
Referring now to the drawings in detail, Figure 1 illustrates one embodiment of exhaust treating apparatus associated with an automotive vehicle installation, generally referred to by reference numeral 14. Fuel combustion product exhaust from the vehicle engine enters a metallic housing 18 of the apparatus through an inlet conduit section 20. The housing is electrically grounded and encloses a flow stream chamber 22 from which a fluent mixtur~ exits through an outlet conduit section ~4. The inlet and outlet conduit sections are respectively mounted on end walls 12 and 16 of the housing at opposite axial ends thereof. A restricted air inlet port 26 is formed in end wall 12 while a water drain port 28 is formed in end wall 16. The fluent mixture in chamber 22 is formed by the inflow of exhaust through inlet 20, inflow of moisture laden air through port 26 and intermittent reaction produced by a reaction generating unit 30 mounted on the end wall 12 within the housing chamber 22.
The unit 30 includes an electrically non-conductive housing 32 having a mounting flange 34 at one axial end secured to the housing end wall 12 by means of an annular retainer 36 and fasteners 38. The inner axial ~nd of the housing 32 threadedly mounts a conven~ional type of automotive engine spark plug 40 with the spaced electrodes thereof projecting into the chamber 22. The spark plug i5 in electrical contact with an ou~u~ terminal 42 of an ignition coil or transformer device 44 ~ixedly held in housing 32 in abutment with the mounting flange 34. An input terminal 46 of the ignition coil device ~4 is electrically connected to a source of DC voltage through conductor 48, positive terminal 50 and conductor 55 in the embodiment of Figure 1 as shown. A third terminal 52 of the coil device is directly connected to fixed negative ground through a ground connection 54.
As diagrammed in Figure 2, the electrodes 56 and 58 of the spark pl~g 40 form a current path through the mixture in chamber 22 to ground so as to act as a "breaker"
causing fluctuation of the current conducted through the electrode gap 60 in series with the primary and secondary windings 62 and 64 of the transformer device 44. The electrical conductivity of the mixture, to which the gap 60 is exposed, will also control the current conducted from the DC voltage source at the input terminal 46 of the transformer 44 through its primary winding 62. The moisture laden mixture in chamber 22 and its conductivity in the electrode gap 60 are therefore the equivalent of series connected variable loading resistors connected to ground in series with the parallel connected windings 62 and 64 of the transformer 44 as diagrammed in the equivalent circuit shown in Figure 4. The secondary winding 64 is also directly connected to ground at terminal 52 and in series with the primary winding 62 through a juncture forming the output terminal 42. The DC voltage source is derived from a battery 66 havlng a negative ground 68 and a positive output applied through ignition switch 70 to the input terminal 46 of the primary winding 62.
It will become apparent from the foregoing dascription that closing of switch 70, will constantly load the battery by applying its DC voltage across the primary and secondary windings interconnected in series by the juncture of the output terminal 42 directly to fixed ground at ground terminal 52. Assuming an initial substantially 2~
zero electrical conductivity in gap 60~ a relatively lo-~volt drop will then occur across the primary winding. As the moisture in chamber 22 and the conductivit~ of gap 60 increases toward low resistance values, the voltage across the primary winding increases toward full battery volta~e.
Accordingly, variation of the conductivity of the mixture in chamber 22 will produce a fluctuating voltage across the primary winding 62 to induce a higher fluctuating voltage across the secondary winding 64 disposed in inductive relation to the primar~ winding in a voltage step-up transformer configuration of device 44. The voltage induced in the secondary winding is applied through output terminal 42 across the electrode gap 60 and when it approaches a peak level, a spark is generated to ignite ~he mixture and produce a reaction. The reaction causes a sudden change in mixture conductivity. Mixture reactive ignition will therefore occur in a cyclic manner, affected in magnitude and ~requency by variation in moisture content of the inflowing air and variation in fuel combustion.
A modified arrangement is shown in Figure 3 which is basically the same circuit-wise as shown in Figure 2.
The spark plug 40 is mounted in a separate metallic enclosure 72 on the end wall 12' through which electrode 58 is grounded. Accordingly, the other electrode 56 is electrically connected by a conductor 74 to the output terminal 42 of transformer ~4 enclosed in its non-conductive housing 32'. The ground te, ;n~l 52 is also connected to negative ground by conductor 54 while input terminal 46 is directly connected to DC voltage conductor 55 from the battery switch.
The battery 66 and switch 70 may form part of the usual ignition circuit associated with an automotive vehicle installation so that the vehicle installation embodiments described will provide exhaust gas treatment for pollution ~3~
reducing purposes. The spar~ plug 40 not only serves to vary combustion completing reactions as a function of the variables aforementivnedl but also serves as a "breaker" to enable the transformer 44 to induce the reaction generating voltage.
The invention as hereinbefore described is also applicable to stationary indu~strial installations to perform exhaust gas treatment as referred to in my prior U.S.
patents aforementionedO For example, combustion products exhausted from the top of a steam generator 76 of a power plant may be treated by passage through an-exhaust gas - treatin~ chamber 78 as diagrammatically shown in Figure 5.
The flow of exhaust from the steam generator through chamber 78 to the smoke stack 80 is induced by a draft fan 82 while aerosol water is introducPd into chamber 78 by a spray device 84 under control of input sensors to regulate the moisture content of the exhaust mixture being treated. A
reaction generating unit 30' is mounted in the chamber 78 and operates in a manner similar to unit 30 hereinbefore described.
The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, fallin~ within the scope of the invention.
Claims (6)
1. In combination with an electrically grounded housing enclosing a chamber through which fluent products are conducted together with an inflow of moisture to establish variable electrical conductivity within the chamber, a spark plug mounted within the housing having electrodes spaced from each other by a gap within said chamber, transformer means having a secondary winding and a primary winding, and a DC source of voltage connected to the primary winding, the improvement comprising a ground terminal directly connected to the secondary winding and a juncture interconnecting the primary and secondary windings in series between the DC voltage source and the ground terminal to load the voltage source and voltage fluctuating means operatively connecting one of the electrodes of the spark plug in series with the primary winding for loading thereof as a function of said variable conductivity within the chamber between the other of the electrodes and the grounded housing to induce a spark generating voltage in the secondary winding applied across the gap of the spark plug.
2. The improvement as defined in claim 1 wherein the voltage fluctuating means includes means electrically connecting said juncture directly to said one of the electrodes of the spark plug and means for exposing the other of electrodes within the chamber.
3. In combination with a chamber enclosing a body of material of variable electrical conductivity, a pair of electrodes mounted in spaced relation to each other forming a gap within said chamber, a source of voltage, and transformer means including a primary winding connected to said voltage source and a secondary winding, the improvement comprising an output terminal interconnecting the windings in series, means for directly grounding the secondary winding and voltage fluctuating means operatively connecting said output terminal to one of the electrodes for varying voltage across the primary winding to induce a reaction generating voltage in the secondary winding applied across the gap between the electrodes.
4. The improvement as defined in claim 3 wherein the voltage fluctuating means includes an electrical connection between said one of the electrodes and the output terminal, means for exposing the other of the electrodes within the chamber and means for grounding said chamber.
5. The improvement as defined in claim 3 wherein the voltage fluctuating means includes an electrical connection between said one of the electrodes and the output terminal and means for grounding the body of material in common with the secondary winding.
6. In combination with an electrically grounded enclosure through which a flow of fluent material is conducted to establish an electrical path therein of variable electrical conductivity, a spark plug mounted within said enclosure having a pair of electrodes spaced apart by an ignition gap, one of said electrodes being exposed within the enclosure and from which said electrically conductive path extends therein, a source of DC voltage, an ignition transformer having primary and secondary windings, said secondary winding being connected to ground, juncture means for electrically connecting the primary winding in series with the secondary winding between the DC source and said ground and means connecting the juncture means to the other of the electrodes for varying voltage applied across the primary winding as a function of the variable conductivity to induce an ignition voltage in the secondary winding, said juncture means being electrically connected to the other of the electrodes to apply ignition voltage across the ignition gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2004412 CA2004412C (en) | 1989-12-01 | 1989-12-01 | Exhaust treating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2004412 CA2004412C (en) | 1989-12-01 | 1989-12-01 | Exhaust treating apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2004412A1 CA2004412A1 (en) | 1991-06-01 |
| CA2004412C true CA2004412C (en) | 1999-11-30 |
Family
ID=4143685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2004412 Expired - Fee Related CA2004412C (en) | 1989-12-01 | 1989-12-01 | Exhaust treating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2004412C (en) |
-
1989
- 1989-12-01 CA CA 2004412 patent/CA2004412C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2004412A1 (en) | 1991-06-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20001201 |