Device for flameless combustion of flush gases

FIELD: technologies for combustion of flush gases, including those under high pressure, during extraction and processing of natural gas and oil.

SUBSTANCE: body of burner, mounted on gas inlet pipe, is made conical with widened portion at upper portion, in the body additionally mounted are two catalyst elements, at lower portion on inlet section first catalyst element is positioned, and above on outlet section - second catalyst element, rotary shutters are mounted on base of conical body in additional way, so that in closed position they are in contact with first catalyst element, and open position between first catalyst element and body gap is formed, also, device is additionally provided with one or more main torches, mounted in gas inlet pipeline below rotary shutters and first catalyst element. Relation of diameters of first and second catalyst elements matches relation of debits of hydrocarbon gas, fed in normal mode and during salvo exhaust. Catalyst elements are manufactured either in form of cell-like structured blocks with direction of channels in parallel to direction of feeding of flush gases, or in form of block sections with granulated catalyst, for example, Rachig rings, or in forms of block sections with active-catalyst metallic shavings, or in form of blocks with active-catalyst metallic meshes.

EFFECT: higher ecological safety and fullness of combustion of flush gases in broad flow range, simplified construction and comfort of maintenance.

6 cl, 3 dwg

 

The invention relates to gazoimage equipment and can be used for combustion of waste gases, including high pressure, in the process of extraction and processing of natural gas and oil.

Mostly this is done using a flare, the flare burners and other devices for flaring. When flaring the amount of harmful substances: carbon monoxide, products of incomplete oxidation (benzo-α-pyrene, aldehydes, nitrogen oxides, soot is 25-50 kg per tonne of emissions. When the volley emissions during planned or emergency stop of the reactor, the amount of emissions increases to 100 kg per tonne of fuel. For dispersion of harmful combustion products in the atmosphere as in the normal mode, and especially when the volley emissions have to be high (up to 100 meters) flare structures, making maintenance and immediate repair of flare devices difficult.

Known devices for complete combustion of hydrocarbons in the atmosphere and wasteless utilization of associated gas at oil fields and industries. Known (patent RF №98116483, F 17 D 1/08, 2000.08.27) system for receiving and burning flare gas consisting of flare columns, flare separators, drainage pumps, flare pits, trap, agneberg is adetula, pilot ignition system, a torch head, a propane tank, utilities, gas, equalizing the uneven incoming hydrocarbon stream, blocks the adsorption of cleaning or drying, extraction of heavy hydrocarbons, compressor unit to compress recyclable part of the gases. This system improves the efficiency of oil production and improve the ecological situation of the region is oil and gas production.

Known flare tip (U.S. Pat. RF 2046255, F 23 L 17/02, 1995.10.20) for combustion of accidental releases of gas in the oil, petrochemical, chemical industries associated with emergency flaring. Flare tip comprises a cylindrical tube with a stopper in the form of a package diaphragm hermetically attached to the pipe. Aperture has a circular through holes, the size of which decreases in the direction of gas flow. The invention reduces the flow of purge gas by reducing its speed.

Closest to the claimed invention is a burner for flare systems (A.S. USSR №1455129, F 23 D 14/38, 30.01.89)containing a mounted on a gas-feeding the trunk flare burner, a casing which is divided by a shell on the internal and external channels, and additional is but is equipped with an adjustable damper, installed in the external canal, which opened in case of emergency discharge of large volumes of gas. The invention is directed to improving the reliability and quality of the combustion of waste gases in a wide flow range.

The disadvantages of the known devices include:

- low environmental reliability, which is associated with flaring emissions (the amount of harmful substances emitted into the atmosphere by burning volley emissions up to 100 kg per tonne of emissions);

low combustion efficiency, especially in the burning mode instantaneous emission, which is associated with a sharp increase in linear velocity in a gas-feeding the trunk;

- complexity and high metal structure.

The problem solved by the invention is the improvement of environmental safety and complete combustion of waste gases in a wide range of flow rates, simplifying the design and ease of maintenance.

The problem is solved in that the burner to the flare unit is installed on a gas-feeding tube and provided with rotary valves, the body is made with a conical extension at the top, the housing additionally has two catalytic element, and the bottom of the inlet section is the first catalytic element, and on top of the output section of the second catalytic e is ement, the butterfly valve is installed on the base of the conical body so that in the closed position adjacent to the first catalytic element, while in the open position between the first catalytic element and the housing, a gap, in addition, the device is further provided with one or more on-duty torches mounted in a gas-feeding the trunk below the rotary valves and the first catalytic element.

List of figures graphical images. 1 shows a longitudinal section of the inventive device in the normal mode of submission of waste gases, figure 2 - position mode volley release figure 3 - cross section a-a in figure 1.

The inventive device includes a conical body 1 is mounted on the gas-feeding tube (2), duty torches 3 with the supply of hydrocarbon raw materials (waste gas), the first catalytic element 4 located in the lower part of the body, the second catalytic element 5 located at the top of the outlet section of the housing and the rotary valve 6.

The inventive device operates as follows. When normal supply of waste gases (figure 1) pre-heat the catalytic element 4 with duty flare device 3 to a temperature of 450-500°With, then off duty flare device, and is flameless Zigana waste gas, supplied in standard mode, the catalytic element 4. The catalytic element 5 is heated to the working (starting) temperature. The waste gases passing through the catalytic element 5 into the atmosphere, fully oxidized and the output does not contain harmful substances (products of incomplete combustion).

Mode volley release (figure 2) rotary valve 6 open, creating a gap for the passage of high-speed flow of waste gases, is flameless combustion of waste gases in the catalytic elements 4 and 5, pre-heated to operating temperature. After stopping volley release the butterfly valve is closed and transferred to your device in normal mode. By lowering the temperature of the catalytic element 4 to 400°include duty flare device 3.

Mainly the ratio of the diameters of the catalytic elements 4 and 5 corresponds to the ratio of flow rates of waste gases supplied in the normal mode and instantaneous release.

Mainly catalytic elements are made in blocks of honeycomb structure with the direction of the channels parallel to the direction of flow of waste gases. Can be applied and other catalytic elements suitable for efficient oxidation of hydrocarbons under conditions of variable flow of waste gases, in particular offices which you granulirovannym catalyst, for example, rings process, or cassette with a catalytically active metal chips, or cassette with a catalytically active metal grids.

1. Device for flameless combustion of waste gases, comprising a housing mounted on a gas-feeding tube and is equipped with an adjustable damper, characterized in that the casing is made conical extension at the top, the housing additionally has two catalytic element, and the bottom of the inlet section is the first catalytic element, and on top of the output section of the second catalytic element, a rotary valve mounted on the base of the conical body so that in the closed position adjacent to the first catalytic element, while in the open position between the first catalytic element and the housing, a gap, in addition, the device is further provided with one or more duty torches mounted in a gas-feeding the trunk below the rotary valves and the first catalytic element.

2. The device according to claim 1, characterized in that the ratio of the diameters of the first and second catalytic elements corresponds to the ratio of the flow rate of the hydrocarbon gas supplied in the normal mode and instantaneous release.

3. The device according to claim 1 or 2, characterized in that Catalytica is the cue elements made in the form of blocks of cellular structure with the direction of the channels parallel to the direction of flow of waste gases.

4. The device according to claim 1 or 2, characterized in that the catalytic elements are made in the form of cassettes with a granular catalyst, for example, rings process.

5. The device according to claim 1 or 2, characterized in that the catalytic elements are made in the form of cassettes with a catalytically active metal shavings.

6. The device according to claim 1 or 2, characterized in that the catalytic elements are made in the form of cassettes with a catalytically active metal grids.



 

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