RU215037U1 - Oil-gas burner with threaded channels for enhanced mixing - Google Patents

Abstract

The utility model relates to the energy industry and can be used when burning liquid and gaseous fuels in boiler plants. The oil-gas burner comprises a housing 1 with a branch pipe 2 for supplying air connected to a burner porthole 3 installed in the furnace opening, a mixing chamber 4, a pipe 5 with a branch pipe for supplying air when the burner is operating on fuel oil, located along the axis of the housing 1, an insert 6 fixed on the outer surface of the pipe 5 with the possibility of rotation and designed to form a pinch in the air path, a peripheral annular collector 7 with a branch pipe 8 and gas-distributing holes 9 located in the pinch zone of the air path, an oil burner 10 installed inside the pipe 5, while the spray part of the oil nozzle 10 is installed with the possibility of axial movement relative to the burner loophole 3 to its outlet using an adjusting mechanism, which is a screw-nut connection 11 and located on the pipe 5 and nozzle 10, channel 12 with a damper 13, through which into the hole 14, made in the base loopholes 3, supply recirculating gases to the gas combustion zone and fuel oil, a cylindrical channel with threaded recesses 15 in the mixing chamber with cutouts 16 for supplying gas to the mixing chamber, moving in the axial direction with the help of a rod 17 and a handwheel 18.

Description

The utility model relates to the energy industry and can be used when burning liquid and gaseous fuels in boiler plants.

The closest in technical essence and the achieved result is a gas-oil burner (RU 208401, publ. operation of the burner on fuel oil, located along the axis of the body, an insert fixed on the outer surface of the pipe with the possibility of rotation and designed to form a pinch in the air path, a peripheral annular collector with a branch pipe and gas-distributing holes located in the pinch zone of the air path, an oil burner installed inside pipes, the spraying part of which is located in the burner embrasure, a channel with a damper located at the base of the embrasure, and an opening in the base of the embrasure for supplying recirculating flue gases, the nozzle is installed with the possibility of axial movement relative to the burner embrasure to its outlet.

The reasons hindering the achievement of the technical result indicated below when using a known device adopted as a prototype include the fact that the known device does not fully use the ability to control the combustion mode of the fuel.

The essence of the utility model is the use of threaded channels to intensify mixing.

The technical problem to be solved by the utility model is the development of a gas-oil burner with threaded channels to intensify mixing.

EFFECT: control of flame shape, fuel-air mixing process, NOx emission rate distribution fields.

The specified technical result in the implementation of the utility model is achieved by the fact that the device contains a housing with a pipe for supplying air connected to a burner embrasure installed in the furnace opening, a mixing chamber, a pipe with a pipe for supplying air when the burner is operating on fuel oil, located along the axis of the body, an insert mounted on the outer surface of the pipe with the possibility of rotation and designed to form a pinch in the air path, a peripheral annular collector with a branch pipe and gas-distributing holes located in the pinch zone of the air path, an oil burner installed inside the pipe, the spraying part of which is located in the burner loophole, a channel with a damper, located at the base of the loophole, and an opening in the base of the loophole for supplying recirculating flue gases.

The peculiarity lies in the fact that a cylindrical channel with threaded recesses is installed inside the mixing chamber to intensify mixing.

The essence of the utility model is illustrated by drawings:

in fig. 1 - prototype oil-gas burner;

in fig. 2 - the proposed oil-gas burner.

Information confirming the possibility of implementing the utility model to obtain the above technical result is as follows.

The oil-gas burner comprises a housing 1 with a branch pipe 2 for supplying air connected to a burner porthole 3 installed in the furnace opening, a mixing chamber 4, a pipe 5 with a branch pipe for supplying air when the burner is operating on fuel oil, located along the axis of the housing 1, an insert 6 fixed on the outer surface of the pipe 5 with the possibility of rotation and designed to form a pinch in the air path, a peripheral annular collector 7 with a branch pipe 8 and gas-distributing holes 9 located in the pinch zone of the air path, an oil burner 10 installed inside the pipe 5, while the spray part of the oil nozzle 10 is installed with the possibility of axial movement relative to the burner loophole 3 to its outlet using an adjusting mechanism, which is a screw-nut connection 11 and located on the pipe 5 and the oil burner 10, the channel 12 with the damper 13, through which into the hole 14, made in the base of the loophole 3, recirculating gases are supplied to the area of \u200b\u200bit rhenium gas and fuel oil, a cylindrical channel 15 with threaded recesses in the mixing chamber with cutouts 16 for supplying gas to the mixing chamber, moving in the axial direction with the help of a rod 17 and a handwheel 18.

The operation of the proposed device is as follows.

When only gas is burned, air from pipe 2 enters housing 1 in the form of an annular flow. When the air flow reaches insert 6, it is compressed, resulting in an increase in its supply rate. Simultaneously, the gas through the branch pipe 8 enters the peripheral annular collector 7 and, evenly distributed over the gas-distributing holes 9, flows out of them in a system of transverse jets into a high-speed air stream. In the mixing chamber 4, an intensive mass exchange of air and gas takes place, and due to the rotation of the insert 6, which is carried out with the help of a thrust, a change in the determining flow size is provided. Further, the formed gas-air mixture enters the burner 3, where it begins to ignite and burn. With the simultaneous combustion of gas and fuel oil, air is supplied to the mixing chamber 4 from the air supply pipe 2 in the form of an annular flow. When the air flow reaches the insert 6, it is compressed, as a result of which the speed of its supply increases. At the same time, the gas enters the collector 7 through the nozzle 8 and, being distributed over the gas-distributing holes 9, flows out of them in the form of transverse jets into a high-speed air flow, and an intensive mass exchange of air and gas occurs. Then the mixture of air and gas enters the burner embrasure. At the same time, fuel oil enters the loophole 3 of the burner through the spray part of the fuel oil nozzle 10, and air enters through the pipe in pipe 5 for intensive fuel oil spraying. Due to the axial movement of the spray part of the oil burner 10 to the outlet of the burner loophole with the help of the adjusting mechanism 11 located on the pipe 5 and the nozzle 10, the combustion zone, i.e. The torch core also moves to the furnace (boiler) furnace, in which the heat removal from the torch is significantly higher than in the embrasure itself, which leads to a decrease in the output of nitrogen oxides. To further reduce the emissions of highly toxic nitrogen oxides during the combustion of gas and fuel oil, the supply of recirculating flue gases through channel 12 with damper 13 into hole 14 at the base of loophole 3 is organized. channel with threaded recesses 15 with cutouts for gas supply 16 using the rod 17 and the steering wheel 18. Thus, in contrast to the prototype, it becomes possible to additionally regulate the flame shape, depending on the operating mode of the boiler, the process of mixing fuel with air, the velocity distribution fields and emission NOx from co-combustion of gaseous and liquid fuels in the burner. (see Thermal protection of turbine blades / B.M. Galitseysky, V.D. Perfect, V.F. Formalev, M.S. Cherny; Edited by B.M. Galitseysky. - M .: MAI Publishing House, 1996 pp. 5).

Claims (1)

Oil-gas burner with threaded channels for intensification of mixing, containing a body with an air supply pipe connected to a burner embrasure installed in the furnace opening, a mixing chamber, a pipe with a pipe for air supply when the burner is operating on fuel oil, located along the axis of the body, an insert fixed on the outer surface of the pipe with the possibility of rotation and designed to form a pinch in the air path, a peripheral annular manifold with a branch pipe and gas-distributing holes located in the pinch zone of the air path, an oil burner installed inside the pipe, the spraying part of which is located in the burner embrasure, a channel with a damper , located at the base of the loophole, and an opening in the base of the loophole for supplying recirculating flue gases, characterized in that a cylindrical channel with threaded recesses is installed inside the mixing chamber to intensify the mixing of flows.

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