Flare pipe

 

(57) Abstract:

The inventive device includes a shaft with upper and lower inlet openings, the bars of round or rectangular cross-section with walls of different heights with the formation of the conical surface, mnogozubkovoy the nozzle, the angle formed by the conical surface and normal to the nozzle axis, is equal to 35 to 40. The gas flows through the manifold to the nozzle evenly distributed through the nozzle channels of the lattice, intensely soothing burns in the flow at the exit of antiflaming-stabilizer. 3 Il. 1

The invention relates to the processing of oil products, in particular to a device for combustion of the process gas in the petrochemical industry and solves the problem of reducing smoke and other gaseous emissions of toxic substances in the torches burning.

Known flare the pipe burner for the combustion of the gas located in the upper exhaust outlet pipe. The pipe is provided with an external protective coating and pipeline to supply gas to the burner [1]

Known also flare the pipe closest to the technical essence of the present invention, containing the barrel with bottom inlet and ve education gap for admission of air from the environment, block gas burners provided with a collector supply incinerated process gas, installed in the lower inlet pipe [2]

In the flare of the pipe due to combustion in a confined pipe flow of air is provided by a relatively high combustion completeness in a narrow range of costs of gas flared.

The disadvantage of this setup is that when you change the flow of combustion gas in a wide range, increases the unevenness of its distribution along the pipe section, blocks gas burners operate at off-design conditions under which combustion is outside of the optimum composition of the mixture occurs flameout in a separate burners, deterioration of combustion completeness, and as a consequence, increases the emission of soot particles and other gaseous toxic substances.

The purpose of the invention, the reduction of harmful emissions and improving combustion efficiency of the process gas in a wide range of changes in its consumption.

In Fig.1 shows a longitudinal section of the flare of Fig. 2 is a view As in Fig. 1 with the lattice in the form of rectangular channels; Fig. 3 is a view As Fig. 1 with a lattice made of axisymmetric shells.

Flare-trubenik protective coating 4, installed on the gravel layer 5 through the uprights 6 with the formation of a gap for receipt of air from the environment. The height of the lower edge of the pipe above the earth's surface is limited to ensuring free access of atmospheric air to the inlet pipe. In the lower inlet 2 is a block gas burners 7, the collector 8 supply of combustion gas, as well as duty burner 9 is provided with a pipeline for supplying gas 10.

Block gas burners 7 includes the grating 11 of round or rectangular cross-section, forming a series of channels made of walls of different heights with the formation from the gas inlet conical surface 12, the angle formed by the surface and normal to the axis of the burner equal =30-45.

In the center of the grating 11 from the gas inlet includes a gas mnogozonovaya nozzle 13 provided with a manifold for supplying gas 8. For the lattice rectangular cross-section, the nozzle 13 is made flat (Fig. 2) and provided with two series of pairs of oppositely oriented nozzles 14. Each nozzle 14 of the gas nozzle 13 is located at the entrance of each row of the grid 11. The axis of the nozzle 14 is oriented along the cone is the range of the blowing angle of the jets provides a maximum range of jets in cross flow of air, allowing the change in the flow rate of combustion gas to change the surface combustion, i.e. it gives the self-regulation of the ratio of fuel to air.

At the same time blowing jets of gas flared at an angle I to the pipe axis, is preserved component of velocity of these jets directed towards the exhaust. Thereby preserved ejection ability of these jets, which increases chimney.

It is known that when the blowing jets in the incoming flow maximum range of the jet is provided at an angle of blowing =30-45. When the angle of blowing streams of process gas being flared at an angle to the air flow <30 decreases the range of the jet and, therefore, decreases the surface combustion, which results I pereobogaschennaya mixture of gas with air in the surrounding I the nozzle channels of the mixer and the deviation of combustion from the optimal mode.

When the angle of blowing streams of process gas being flared at an angle I to the air flow >45reduced axial component of velocity of the jet in the direction of the exhaust, which reduces cravings pipe.

In the proposed device the maximum range allows uniformly R is ozdoba to burn it.

Behind bars 11 in the direction of gas flow is set entitlementality flame 15 in the form of a fine mesh or small sites, either in the form of a porous plate.

The bars 11 may be made of spaced concentric to each I other axisymmetric shells 16 (Fig.3), separated by radial partitions 17 in a series of sector channels. The grating 11 from the gas inlet forms a conical surface 12. When the nozzle 13 is cylindrical, on the generatrix of which is radially mounted nozzle 14. The axis of the nozzle 14 is oriented along the conical surface 12 and each nozzle is located at the entrance of each row resetn 11.

The dimensions of the channels of the grating 11 and their number is determined from the condition of education, the optimum composition of the mixture at the outlet of the channels, and sizes of nozzles nozzles of the conditions providing the maximum range of a gas jets, defined by the formula

< / BR>
where the angle of inclination to the axis of the burner nozzles gas nozzles;

Wo, rothe speed and density of the expiration gas jets;

Wn,nthe speed and density of the surrounding air.

The Central duty burner 9 is equipped with an electric spark plug 18.

Torch t is redstem include spark plugs 18 and the gas supply to the pilot burner 9.

The control of actuation of the pilot burner 9 is a thermocouple, then the spark plug 16 is turned off, and flare the pipe is ready for combustion of the process gas. Duty burner 9 has two functions: first, it provides primary burning process gas during its flow in the unit of gas burners 7, second minimum air flow through the flare pipe in General, due to the chimney (in the absence of the filing process gas), which increases the safety of the operation of the flare. Incinerated process gas flows through the manifold 8 to the gas nozzle 13. Through the nozzle 14 of the nozzle 13 technological combusted gas flows at an angle to the axis of the burner = 30-45oand evenly distributed over the part of the channel grating 11 is proportional to the depth of penetration of the jets of gas, i.e., the total flow of combustion gas.

At minimal cost technological combusted gas flows through the nozzle 14 in the next channels grating 11, spaced from the axis of the nozzle at a distance equal to the range of the jet with minimal gas consumption. When increasing the flow rate of the process gas increases the range of the jets emanating from the nozzles 14 and the gas enters the following channels grating 11, the decision process gas with air and the formation of gas-air mixture to the optimal composition, which burns intensely in soothing stream at the output of antiflaming-stabilizer 16 with a minimum output CO, and soot. The distance from the axis of the nozzle 13 to the far channels is determined by the range of the jets of gas at the maximum flow rate of the process gas.

Atmospheric air from the environment enters through the gap between the ground surface and the bottom cut of the pipe 1 into the inlet 2 and the channels of the grating 11. Supply of atmospheric air to the flare pipe operating modes is provided by the joint action of the thrust tube and ejection ability of the process gas jets coming in every single channel grating 11.

Due to the proposed distribution of gas and air is samoreguliruemaja composition of the gas mixture in each channel of the lattice to the optimal virtually the entire operating range of the cost of gas flared.

The resulting hot combustion products pass the torch pipe in conditions of high temperatures and the presence of a certain excess air. When this occurs, an additional oxidation process, which also contributes to reducing the content of all toxic compounds, in particular, NOxand sa is Yagodnoe hole 3. To prevent overheating of the walls of the barrel is provided by the barrier wall cooling air.

Flare tube containing barrel with bottom inlet and top outlet, provided with a protective coating, set with a gap, a unit of gas burners, communicated with the reservoir for supplying process gas flared installed in the lower inlet, characterized in that, to reduce harmful emissions and improve the completeness of the combustion process gas in a wide range of changes in consumption, it is equipped with a grill made of walls of different heights with the formation from the gas inlet conical surface, installed behind bars along the gas antiflaming-stabilizer in the form of a fine mesh or small SOT, or a porous plate, the burner unit is made in the form mnogomodovoi injector installed in the center of the grill from the gas inlet, and each nozzle is located respectively at the input of each of a number of channels of the lattice, and the angle formed by the conical surface of the grating and the normal to the axis of the burner, equal to 30-45.

 

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