Combustion – Structural installation
Patent
1997-06-05
1998-09-22
Dority, Carroll B.
Combustion
Structural installation
F23D 1400
Patent
active
058105786
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for burning gas in oil/ gas production, wherein the production plant is assigned a burner through a low pressure collection conduit for process gas.
Gas escaping a production plant for oil/gas constitutes an explosion risk and is, consequently, burned before the combustion products are released into the atmosphere.
In order that sudden and unintentional discharges of gas could be burned in the burner, the latter has to be ignited at all times. This involves the necessity of supplying the burner with gas continuously.
Burning gas pollutes the atmosphere and gives an increased discharge of CO.sub.2. Moreover, in order to maintain the permanent flame, one has to burn gas that otherwise might have been sold and it is, therefore, connected with substantial costs to keep the burner continuously in operation with a view to a possible future unintentional discharge of gas.
Consequently, the object of the invention has been to provide a device for burning gas in accordance with the introduction section, wherein burning of valuable production gas has been kept at a minimum level.
According to the invention, this object is realized through shaping and designing the device such that it exhibits the features appearing from the characterizing part of the following claim 1.
A process plant to which the device according to the invention should be assigned, is in known manner connected to a collection line for surplus gas. This collection line is assigned a tank (expansion tank) in which an underpressure is maintained, a compressor carrying surplus gas from the tank and back into the process. The tank is connected to a flare burner through a liquid trap preventing the compressor to suck false air.
Thus, according to an important feature of the invention, the burner is connected to an expansion tank through a liquid trap.
According to another important feature of the invention, the liquid trap is assigned a liquid reservoir and a level controller adapted to influence the liquid reservoir in order to replace possible loss of liquid in the liquid trap.
Advantageously, the liquid trap may be assigned a non-return valve adapted to prevent gas from penetrating into said liquid reservoir.
A flare pipe pot may be disposed downstream relative to the liquid trap, and said pot may be provided with at least one lateral guide/barrier plate preventing trap liquid from the liquid trap from being hurled up into the flare pipe leading to the burner which is located at the uppermost level.
Upon a sudden discharge of gas, the pressure within the expansion tank increases, whereupon liquid from the liquid trap is hurled up into said flare pipe pot and, thus, gives a free passage for gas to the burner.
According to a subordinate feature of the invention, the burner is continuously driven with pilot gas, such that a permanent pilot flame is being maintained. Thus, the burner is assigned a pilot gas reservoir for controlled supply of pilot gas to the burner. Such a controlled combustion of pilot gas represents only insignificant costs as compared with the excessive combustion of process gas taking place at known and conventional process plants, and which has been further accounted for introductorily.
Further objects, features and advantages of the invention appear from the following description of an examplary embodiment which is diagrammatically illustrated on the attached drawings, wherein:
FIG. 1 shows the process plant's collection line and burner as well as intermediate equipment components in side elevational view/axial section;
FIG. 2 shows in perspective the expansion tank and the flare pipe pot and intermediate components;
FIG. 3 shows a vertical cross-sectional view through the flare pipe pot separately.
In the drawings, FIG. 1, reference numeral 1 denotes a collection line for surplus gas and smaller gas discharges, assigned a process plant not further shown.
The collection line 1 leads to an expansion tank 2 (a tank which accommodating change of volume) operating at underpressure and which, to this en
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patent: 3915620 (1975-10-01), Reed
patent: 4128389 (1978-12-01), Straitz
patent: 4516932 (1985-05-01), Chaudot
Patent Abstracts of Japan, vol. 13, No. 41, M-791, abstract of JP, A, 63-247526(Asia Sekiyu K.K.), 14 Oct. 1988 (14.10.88).
Hystad, deceased Harald
Hystad, legal representative by Anne Elise
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