RU20368U1 - GAS INJECTION BURNER - Google Patents

Description

Gas injection burner

The proposal relates to the oil refining and petrochemical industries and can be used to burn gaseous fuels in tube furnaces.

Known gas injection burner containing a Central gas barrel installed in the Central duct, an annular gas manifold connected by nozzles (SU 1288446 A1. 02/07/1987. F24D 14/02).

A disadvantage of the known burner is low reliability and efficiency.

The technical result of the proposed burner is to increase reliability and efficiency by uniform distribution of gas and improve the mixture formation of fuel components.

The technical result is achieved by the fact that the gas injection burner comprises a central gas barrel installed in the central duct, an annular gas collector connected to nozzles coaxially with which peripheral gas injection barrels are placed, which are surrounded by a cylindrical shell, the lower part of which is movable in the axial direction with the possibility the formation of a gap in the area of the outlet openings of the nozzles and inlet openings of the peripheral gas shafts and with the possibility of overlapping by the required amount windows of the upper stationary part. The burner is equipped with a disk air regulator installed with the possibility of overlapping the lower open end of the central duct and regulating the gap formed between them.

The drawing shows a gas burner.

The burner contains a central duct 1, to the lower part of which a gas annular manifold 2 is welded, consisting of two disks and a shell welded with sealed welds. A pipe 3 with a flange for supplying fuel gas is welded to the shell. Six ladies are welded onto the upper disk, onto which threaded nozzles 4 are installed, through which gas is supplied from the annular collector 2 to the injectors 5 mounted coaxially with the nozzles. The upper part of the injector is narrowed for the purpose of leveling the velocity field of the gas-air mixture. The lower part of the injector is expanded to reduce the resistance to air flow at the entrance to the gas mixing zone. All injectors are installed with the lower part in the holes of the annular partition 6, which together with the upper cover of the gas manifold 2 creates a suction chamber for the injected air flow. The amount of injected air is regulated by a cylindrical regulator 8. A plate 20 is welded to the regulator,

having a slot in the middle part in which a latch with a nut is located. The suction chamber is divided radially by six metal plates to form an autonomous suction section for each injector. An external cylindrical shell 7 is installed around the injectors. The burner is fixed to the hearth of the furnace using brackets 9. On the outer shell 7 there are rectangular windows 17 for suction of secondary air into the annular gap between the injectors. The amount of air is regulated depending on the thermal power of the burner and the amount of vacuum in the furnace using a cylindrical regulator 8. Inside the duct 1, a centering pipe is mounted, which is attached to the duct by plates 12. At the bottom of the centering pipe 11 there is a disk regulator 13 mounted for movement, when opened, air enters the casing due to vacuum in the furnace. Four plates are welded on the regulator disk, which act as a stabilizer of the wind pressure. A central gas barrel 10 is installed in the centering pipe for supplying waste gas to the burner. At the output of the barrel there is a nozzle with twelve holes. In the furnace embrasure 14, a pilot burner 16 is installed. There is a window 15 for the flame control device.

The operation of the burner is as follows. When burning gas fuel, it is supplied through pipe 3 to the gas annular manifold 2, and gas flows out of it through six nozzles 4 into the injectors, in which the formation of the gas-air mixture occurs. In order to prevent the passage of the flame through the injectors to the nozzles, the system is designed so that for any gas flow rate within the permissible heat loads, the amount of injected air should correspond to an excess air coefficient of 0.53. At the outlet of the injectors, secondary air is added to the gas-air mixture, which enters through the windows 17. After exiting the burner, the gas-air mixture enters the furnace inlet 14 from refractory material, where it ignites and forms the core of the torch. The final combustion of gas takes place in the furnace of a furnace or heater with a coefficient of excess air a0bsc 1.1 + 1.15.

If the amount of air is not enough for complete combustion of gas at high thermal capacities due to a small vacuum in the furnace, then the air disk regulator 13 opens. Regardless of the amount of gas burned, the amount of air supplied must be sufficient to ensure an air coefficient of 1.1 h-1.15.

When the waste gas is supplied to the central gas barrel 10, it enters the combustion zone through a cap with twelve holes. The angle of divergence of the gas jets is 120 °, which ensures a good mixture of gas with air and the necessary stabilization of the flame when the fuel gas supply is cut off. Combined combustion of fuel and waste gas can be carried out in any ratio, however, when they are burned, the total thermal power should not exceed 2.0 MW.

Claims (2)

1. A gas injection burner comprising a central gas barrel mounted in a central duct, an annular gas manifold connected to nozzles coaxially with which peripheral gas injection barrels are enclosed by a cylindrical shell, the lower part of which is movable in the axial direction with the possibility of a clearance in the area of the outlet openings of the nozzles and the inlet openings of the peripheral gas injection trunks and with the possibility of overlapping the upper fixed window by the required size e parts. 2. The burner according to claim 1, characterized in that it is equipped with a disk air regulator installed with the possibility of overlapping the lower open end of the central duct and regulating the gap formed between them.