RU2460017C1 - Device for thermal neutralisation of liquid wastes - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: in device for thermal neutralisation of liquid wastes, which involves horizontal flame burners, for example two of them, gas header, gas inlet branch pipe, with flame arrester arranged at the edge, liquid waste header, liquid waste inlet branch pipe, at that, gas and liquid waste headers are connected to flame burners, the device is equipped with a spreader in the form of Coanda body, which is arranged on the header, parallel to horizontal flame burners there installed is pilot burner, and in the housings made in the form of tubes there arranged is ignition burner and flame scanner. Recirculation station made of two coaxial tubes is installed opposite the outlet of gas-liquid mixture from flame burners; besides, inner tube is shorter than outer one; convergent branch pipe is arranged at the recirculation station inlet and divergent branch pipe is installed at recirculation station outlet so that annular space is formed between edges of inner tube and internal surfaces of convergent branch pipe and divergent branch pipe, as well as between inner tube and outer tube.

EFFECT: higher liquid waste neutralisation quality.

Description

The invention relates to devices for the thermal neutralization by fire of liquid waste, for example, industrial effluents generated in gas condensate and oil fields.

Known horizontal flare device designed for the thermal neutralization of industrial effluents in a horizontal open flare (Mamistov V.V., Kravchenko V.A. et al. Developments by Yuzhniigiprogaz to protect the environment at gas production facilities. - M .: VNIIEgazprom, 1986, - Review inform. Ser. Natural gas and environmental protection. Issue 4, p.21).

The disadvantage of this device is the incomplete neutralization of liquid waste, which leads to environmental pollution.

The closest in technical essence and the achieved result is a horizontal flare device for neutralizing industrial wastewaters (Mamistov V.V., Kravchenko V.A. et al. Developments by Yuzhniigiprogaz on environmental protection at gas production facilities. - M .: VNIIEgazprom, 1986, - Review information Ser. Natural gas and environmental protection. Issue 4, p. 33), containing two horizontal burners connected by nozzles to gas and liquid collectors. A gas inlet pipe is connected to a gas manifold, a liquid inlet pipe is connected to a liquid manifold. Bottom or top of the burners adjoins a divider in the form of the body of Coanda. Liquid is supplied through the manifold, nozzles to nozzles, and then to expanding nozzles of the burners. Combustible gas is supplied there. The liquid is crushed in the expanding nozzle into tiny drops. Coming out of the nozzle at a high speed, the combustible gas with droplets of liquid is mixed with air, forming a combustible mixture. This combustible mixture is ignited by the flame of the pilot burner. In this case, water evaporates in the flame of the torch, the combustible mixture burns, other substances are split into components under the action of high temperature.

The disadvantage of this device is the incomplete neutralization of waste, due to the fact that on the periphery of the flame particles of the liquid quickly cool and, not having time to evaporate, settle on the ground, which leads to environmental pollution.

The technical result of the claimed invention is improving the quality of neutralization of liquid waste.

The specified technical result is achieved by the fact that the device for the thermal neutralization of liquid waste includes horizontally placed flare burners, for example two, a gas collector, a gas inlet pipe with a flame arrester located at the end, a liquid waste collector, a liquid waste inlet pipe, while gas collectors and liquid waste is connected to the torch burners, the device is equipped with a divider in the form of the Koanda body placed on the collector, parallel to the horizontal torch burners installed the burner and in the cases made in the form of pipes, a pilot burner and a flame control sensor are placed; a recirculation unit is installed opposite two gas-liquid mixtures from the flare burners, made of two coaxially installed pipes, while the inner pipe is shorter than the outer one, the tapering is placed at the inlet of the recirculation unit a branch pipe, and an expanding branch pipe is installed at the outlet of the recirculation unit so that between the ends of the inner pipe and the inner surfaces of the tapering branch pipe and the expanding branch pipe, and an annular space is formed between the inner pipe and the outer pipe.

Figure 1 shows a General view of the device, figure 2 is a view along A, figure 3 is a leader along B, figure 4 is a leader along B.

The device comprises a frame 1 on which a gas inlet pipe 2 with a flame arrester 3 located on the end face, a gas collector 4, a liquid waste inlet pipe 5, a liquid waste collector 6 is installed on the racks and brackets. The device includes a protective screen 7, a standby burner 8 and a divider 9 made in the form of the body of Coanda. The divider 9 is placed on the collector 10, the collector 10 is provided with a narrow slot 11. A pipe 12 is laid from the gas inlet 2 to the gas supply to the collector 10. A pipe 13 is welded to the liquid waste collector 6, passing through the gas collector 4 and ending in thread, which the nozzles are screwed to. 14. Pipes 15 are welded to the gas manifold 4, terminating in a thread onto which the expanding nozzles are screwed 16. The nozzles 15 with the expanding nozzles 16 and the nozzles 14 on the nozzles 13 form a torch burner for burning ha liquid mixture.

To ignite the standby burner 8 there is a pilot burner 17 installed in the housing 18 in the form of a pipe. To control the flame, there is a flame control sensor 19 installed in the housing 20 in the form of a pipe. The housings 18 and 20 are attached to the uprights of the frame with clamps 21 with nuts.

A recirculation unit is installed opposite the outlet of the gas-liquid mixture from the flare burners, made of two coaxially mounted pipes and centered between each other by radially arranged plates 22. The inner pipe 23 is shorter than the outer pipe 24. At the inlet of the recirculation unit there is a tapered pipe 25, an expanding pipe 26 is placed at the output between the ends of the inner pipe 23 and the inner surfaces of the tapering pipe 25 and the expanding pipe 26, and also between the inner pipe 23 and the outer pipe 24 is formed evoe space 27.

The device operates as follows.

Connect the device to the pipelines for the supply of combustible gas and liquid waste.

The pilot burner 17 and the pilot burner 8 are connected to the fuel gas supply system and the control system, the flame control sensor 19 is connected to the control system.

Fuel gas is supplied to the ignition and standby burners (17 and 8), then a command is issued from the control system to ignite the ignition burner 17. From the flame of the ignition burner 17, the standby burner 8 is ignited, after which the ignition burner 17 is turned off. The flame of the standby burner 8 is controlled by the flame control sensor 19. After ignition of the standby burner 8, flammable gas is supplied to the flare burners through the flame arrester 3, the gas inlet 2, gas manifold 4, and the nozzles 15, which is ignited by the flame of the standby burner 8. Part of the gas flows through line 12 into the collector 10 and exits through a narrow slot 11. Gas, a thin layer flowing around the divider 9, is saturated with air and forms a combustible mixture. This combustible mixture is ignited by the flame of the standby burner 8 and forms a flat torch, which intersects with the torch of the torch burners and increases the combustion efficiency, which contributes to a better neutralization of liquid waste. After igniting the flare burners, liquid waste from the pump or from the pressure vessel is fed into the device.

Liquid waste through the liquid waste inlet pipe 5, the liquid waste collector 6, the pipes 13, the nozzles 14 are fed to the expanding nozzles 16 of the torch burners, where they are crushed into the smallest particles and mixed with gas. When exiting the nozzles 16 at high speed, the gas-liquid mixture is mixed with air, forming a combustible mixture. The combustible mixture burns, while the water in the formed flare evaporates, the combustible components contained in the liquid waste are burnt, and non-combustible substances are split into harmless components under the influence of high temperature. From the periphery of the flame, where the temperature is lower and the liquid particles may not completely evaporate, part of the combustion products enters the annular space 27 and moves in the direction opposite to the direction of the main stream of combustion products, and along the annular space 27 between the outer pipe 23, the inner pipe 22 through the narrowing the pipe 25 enters recycling. After the end of the neutralization cycle, stop the flow of liquid waste, turn off the gas supply to the flare burners, then turn off the gas supply to the standby burner 8.

Claims (1)

A device for thermal neutralization of liquid waste includes horizontally placed flare burners, for example, two, a gas collector, a gas inlet pipe, with a flame arrester located at the end, a liquid waste collector, a liquid waste inlet pipe, while gas and liquid waste collectors are connected to the flare burners, the device is equipped with a divider in the form of the Koanda body placed on the collector, an on-line burner is installed in parallel with the horizontal torch burners, and in cases made in the form of pipes, a pilot burner and a flame control sensor are located; opposite the gas-liquid mixture exit from the flare burners, a recirculation unit is installed made of two coaxially installed pipes, the inner pipe is shorter than the outer one, a narrowing pipe is placed at the inlet of the recirculation unit, and an expanding pipe is installed at the output of the recirculation unit so that between the ends of the inner pipe and the inner surfaces of the tapering pipe and the expanding pipe, and also between the inner pipe and the outer pipe about azuetsya annulus.

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