RU223874U1 - Gas-oil burner for burning liquid and gaseous fuels in a closed annular flame - Google Patents

Abstract

The utility model relates to the energy sector and can be used when burning liquid and gaseous fuels in boiler plants. The oil-gas burner contains a housing 1 with a pipe 2 for air supply, connected to a burner embrasure 3 installed in the hole of the boiler unit, a mixing chamber 4, a pipe 5 with a pipe for supplying air when the burner operates on 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 on the air path, a peripheral ring manifold 7 with a pipe 8 and gas distribution holes 9 located in the pinch zone of the air path, a fuel oil nozzle 10 installed inside the pipe 5, while the fuel oil spray part the nozzle 10 is installed with the possibility of axial movement relative to the embrasure 3 of the burner to its outlet using an adjustment mechanism, which is a screw-nut connection 11 and located on the pipe 5 and the fuel oil nozzle 10, a cylindrical channel 12 with threaded recesses in the mixing chamber with cutouts 13 for supply gas into the mixing chamber. At the base of the embrasure there is a pipe 14 through which secondary air is supplied to the air distribution chamber 15, in which there is a secondary air control damper 16, designed to supply the required amount of secondary air, the position of which is indicated by notches located on the damper movement indicator 17, and the annular channel of the secondary air. air 18, designed to supply secondary air to the combustion part of the boiler unit. The technical result is the possibility of additional regulation, depending on the operating mode of the boiler, of the torch shape (closed volumetric ring of the “torus” type), the process of mixing fuel with air, velocity distribution fields and NOx emissions during the joint combustion of gaseous and liquid fuels in the combustion part of the boiler unit.

Description

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

The closest in technical essence and achieved result is a gas-oil burner [patent No. 158820 MPK F23D 17/00 (2006.01). Gas and oil burner (A.Yu. Berezutsky, V.D. Katin (RF). - No. 2015129154/06; Announced 07/16/2015. Published 01/20/2016, Bulletin No. 2 p., 1 ill.], containing a housing with a pipe for supplying air connected to the burner embrasure installed in the hole of the boiler unit, 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 fixed to the outer surface of the pipe with the possibility of rotation and designed to form a pinch on the air path, a peripheral annular manifold with a pipe and gas distribution holes located in the air path pinching zone, an oil nozzle installed inside the pipe, the spray part of which is located in the burner embrasure, characterized in that the nozzle is installed with the possibility of axial movement relative to the burner embrasure to its exit (see RF Patent No. 158820).

The reasons preventing 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 utilize the ability to regulate the fuel combustion mode.

The essence of the utility model is a two-stage combustion air supply.

The technical problem that the utility model is aimed at solving is the development of a gas-oil burner for burning liquid and gaseous fuels in a closed annular flame.

The technical result is to control the shape of the torch.

The specified technical result when implementing the utility model is achieved by the fact that in this gas-oil burner, containing a housing with an air supply pipe connected to a burner embrasure installed in the opening of the boiler unit, a mixing chamber, a pipe with an air supply pipe when the burner operates on oil, located along the axis of the housing, an insert mounted on the outer surface of the pipe with the possibility of rotation and designed to form a pinch on the air path, a peripheral annular manifold with a pipe and gas distribution holes located in the air path pinch zone, an oil nozzle installed inside the pipe, the spray part of which is located in the burner embrasure, a cylindrical channel with threaded recesses is installed inside the mixing chamber. At the base of the embrasure there is a pipe with the ability to supply secondary air to the air distribution chamber, in which there is a secondary air control damper designed to supply the required amount of secondary air, the position of which is indicated by notches located on the damper movement indicator, and an annular secondary air channel designed to supply secondary air into the combustion chamber of the boiler unit.

The essence of the utility model is illustrated by drawings:

figure 1 – prototype of a gas-oil burner;

figure 2 – proposed oil-gas burner;

Fig. 3 – flow part of the burner.

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

The oil-gas burner contains a housing 1 with a pipe 2 for supplying air, connected to a burner embrasure 3 installed in the hole of the boiler unit, a mixing chamber 4, a pipe 5 with a pipe for supplying air when the burner operates on 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 on the air path, a peripheral ring manifold 7 with a pipe 8 and gas distribution holes 9 located in the pinch zone of the air path, a fuel oil nozzle 10 installed inside the pipe 5, while the fuel oil spray part the nozzle 10 is installed with the possibility of axial movement relative to the embrasure 3 of the burner to its outlet using an adjustment mechanism, which is a screw-nut connection 11 and located on the pipe 5 and the fuel oil nozzle 10, a cylindrical channel 12 with threaded recesses in the mixing chamber with cutouts 13 for supply gas into the mixing chamber. At the base of the embrasure there is a pipe 14 through which secondary air is supplied to the air distribution chamber 15, in which there is a secondary air control damper 16, designed to supply the required amount of secondary air, the position of which is indicated by notches located on the damper movement indicator 17, and the annular channel of the secondary air. air 18, designed to supply secondary air to the combustion part of the boiler unit.

The operation of the proposed device is carried out as follows.

When burning only gas, air from pipe 2 enters in the form of an annular flow into housing 1. When the air flow reaches insert 6, it is pressurized, as a result of which the speed of its supply increases. At the same time, gas flows through pipe 8 into the peripheral annular manifold 7 and, evenly distributed over the gas distribution holes 9, flows out of them in a system of transverse jets into a high-speed air flow. In the mixing chamber 4, intensive mass exchange of air and gas occurs and due to the rotation of the insert 6, carried out using traction, a change in the determining size of the flow is ensured. Next, the resulting gas-air mixture enters the embrasure 3 of the burner, where its ignition and combustion begins. When gas and fuel oil are simultaneously burned into the mixing chamber 4 from the air supply pipe 2, air is supplied in the form of an annular flow. When the air flow reaches insert 6, it is compressed, as a result of which the flow rate increases. At the same time, gas enters manifold 7 through pipe 8 and, distributed through gas distribution holes 9, flows out of them in the form of transverse jets into a high-speed air flow, and intense 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 burner embrasure 3 through the spray part of the fuel oil nozzle 10, and air enters through the pipe 5 to intensively spray fuel oil. Due to the axial movement of the spray part of the fuel oil nozzle 10 to the exit of the burner embrasure using 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 combustion part of the boiler unit, in which the heat removal from the torch is significantly higher than in the embrasure itself, which leads to a decrease in the yield of nitrogen oxides.

To further reduce emissions of highly toxic nitrogen oxides when burning gas and fuel oil, vortex combustion of liquid and gaseous fuel is carried out, which does not require additional devices and energy consumption for recirculating combustion products, injection of steam or water into the combustion zone. Vortex combustion of liquid and gaseous fuel in an annular flame allows the simultaneous use of several methods for reducing the concentration of harmful substances, which is carried out as follows: at the base of the embrasure there is a pipe 14 through which secondary air is supplied to the air distribution chamber 15, in which there is a secondary air control damper 16, designed to supply the required amount of secondary air, the position of which is indicated by notches located on the damper movement indicator 17, and the annular secondary air channel 18, intended for supplying secondary air to the combustion part of the boiler.

Thus, in contrast to the prototype, it becomes possible to additionally regulate, depending on the operating mode of the boiler, the shape of the torch (closed volumetric ring of the “torus” type), the process of mixing fuel with air, velocity distribution fields and NOx emissions during the joint combustion of gaseous and liquid fuels in the furnace boiler parts. (see Thermal protection of turbine blades / B. M. Galitseysky, V. D. Sovershenny, V. F. Formalev, M. S. Cherny; Edited by B. M. Galitseysky. - M.: MAI Publishing House, 1996 . p.5)

Claims (1)

Gas-oil burner for burning liquid and gaseous fuel in a closed annular flame, containing a housing with an air supply pipe connected to a burner embrasure installed in the opening of the boiler unit, a mixing chamber, a pipe with a pipe for supplying air when the burner operates on oil, located along the axis of the housing , an insert mounted on the outer surface of the pipe with the possibility of rotation and designed to form a pinch on the air path, a peripheral annular manifold with a pipe and gas distribution holes located in the pinch zone of the air path, a fuel oil nozzle installed inside the pipe, while the spray part of the fuel oil nozzle is installed with the possibility of axial movement relative to the burner embrasure to its outlet using an adjusting mechanism, which is a screw-nut connection and located on the pipe and the fuel oil nozzle, a cylindrical channel with threaded recesses in the mixing chamber with cutouts for supplying gas to the mixing chamber, characterized in that at the base of the embrasure there is a pipe with the ability to supply secondary air to the air distribution chamber, in which there is a secondary air control damper designed to supply the required amount of secondary air, the position of which is indicated by notches located on the damper movement indicator, and a secondary air annular channel designed to supply secondary air into the combustion chamber of the boiler unit.