Combustion – Structural installation
Patent
1997-04-11
1999-10-12
Lazarus, Ira S.
Combustion
Structural installation
431 91, 431269, 431 5, F23D 500, F23D 1400
Patent
active
059645865
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method, an apparatus, and an ignition device for igniting combustible gases, for example, from a flare of a flare tower, where an ignition device is launched toward a region of combustible gas.
BACKGROUND OF THE INVENTION
With respect to the ignition of gas flows, for example, in a flare, a distinction may be made between two different ignition techniques. One technique is a point ignition system, where the gas is ignited only at one point. This can be achieved by means of, for example, a match, a pilot burner, or a flame front generator. A prerequisite for point ignition is that the gas, concentration at the point of ignition is between the lower and the upper detonation line. The other technique is a volume ignition system, where ignition occurs through sparks being scattered over a large area and the gas in this area is ignited. The latter technique is a great deal more reliable than the point ignition system.
Norwegian Patent Application No. 932017 teaches a method for the ignition of combustible gas emitted through a flare in a flare tower. The ignition device is a projectile which is fired toward the gas outlet. The ignition device strikes an impact plate mounted at the gas outlet, whereby the ignition device undergoes a reaction and brings a flow of incandescent particles into the gas flow which is ignited. Thus, the ignition device is detonated by impact. This method has a number of inconveniences. For instance, the equipment used is excessively complicated. One reason therefor is that the ignition device is fired by means of very high propulsion gas pressure in the form of a gas pulse, having a pressure of magnitude, 260-300 bar. The manner in which the ignition device is fired makes it impossible to stop the ignition device after it is launched. Also it is not possible to return the ignition device to the launching means. This solution uses a protective tube having a clearance between the ignition pellet (the projectile) and the bore. All the energy for the pellet is supplied before it enters the protective tube (i.e., a normal shot at high pressure).
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method, an apparatus, and an ignition pellet for igniting gases in a flare tower while avoiding the disadvantages described above.
Another object of the present invention is to provide a device for igniting gases in which the ignition pellet is not launched by high pressure, but is guided out of a launching tube which has a continuous supply of propulsion gas.
Another object of the invention is to provide a programmable ignition pellet, which may be stopped after it has been set in motion and which may be returned to the launching means.
Yet another object of the present invention is to provide an ignition pellet which is activated during its movement from the launching means to the flare by an electrical or mechanical device which initiates/activates the ignition pellet.
The present invention provides a controlled and lower speed ignition pellet as compared to known solutions. As a result the required safety zone around the device can be smaller, the danger to helicopter traffic near the flare tower is reduced. Compared to a known solution, the present invention entails far lower investment costs, inter alia, because there is only one pressure level for the propulsion gas system and standard components may be more widely used than in the known solution. The present invention is also more flexible than the known solution by being adaptable to all types of flares.
The above objects are achieved by a method for the ignition of gases in a flare tower or flare in which an ignition device is launched toward a region of a combustible gas. The ignition device is propelled by means of a pressure medium through a guidance tube to the gas cloud region. The ignition device undergoes a reaction which ignites the gas in the gas cloud region. The activation and reaction time is predetermined and adapted to the particular fla
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.O slashed.demark Tom
Dagestad Sjur
Cocks Josiah C.
Lazarus Ira S.
Techno Consult A.S.
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