SU1224506A1 - Multifuel burner - Google Patents

Description

one

The invention relates to burner devices and can be used in steam boilers of thermal power plants operating on low-grade solid fuel backlit with natural gas or fuel oil.

The aim of the invention is to improve the quality of fuel combustion and operational reliability.

Figure 1 shows the burner, a longitudinal section; figure 2 - section aa in figure 1.

The combined burner includes a housing 1 with a snail swirler, coaxially placed in the housing I central 2 and peripheral 3 pipes for supplying primary and secondary air, respectively, an annular gas manifold 4, located in the channel 5 between the pipes 2 and 3 and equipped with nozzles 6, and the fuel oil nozzle 7

The burner further comprises a pipe 8 for supplying high density fuzz introduced into the central pipe 2 and an ignition nozzle 9. Both nozzles 7 and 9 are placed in channel 5 between pipes 2 and 3 in the same horizontal plane.

The nozzles 6 of the gas manifold 4 are placed in its lower part at an angle of 30 to the vertical. On the inner side wall of the peripheral pipe 3 there are ventilation holes 10. The nozzles 6 of the gas manifold 4 and the fuel oil nozzle 7 are installed with the possibility of longitudinal movement with a pitch (O, 18-0.22) d, where d is the diameter of the burner mouth.

Go1) Christmas tree works as follows.

A central flow of high concentration is supplied to the central tube 2 for supplying primary air through the tube 8. In tube 2, an air mixture is prepared by mixing a stream of primary air, moving at a speed of 18-25 m / s, with a stream of high concentration pshi. Due to the change in the primary air flow rate, the required concentration of dust in the air mixture can be achieved depending on the reactivity of the fuel.

Secondary air is supplied through a peripheral pipe 3 sec. By a twist in a street-mounted swirl. Secondary load 245061

the spirit partly enters through the windows 10 to ventilate the channel 5 and supply part of the air to the gas nozzles 6 and the pilot nozzle 9. Natural gas

5 enters the retractable gas nozzles 6 to the cut-off of the burner, where the process of mixing takes place. Burning the burner is carried out with a natural gas firing nozzle 9

10 then turn on high concentration dust. When operating with natural gas illumination, the fuel oil nozzle 7 is pushed inside the channel 5 to the displacement center (, 22) d, which

15 protects it from exposure to high temperatures. The burner works similarly when burning low-grade solid fuel with fuel oil illumination.

20 Entering a stream of high concentration dust at the beginning of the primary air channel, moving at a speed of 18-25 m / s, makes it possible to spray highly concentrated

25 dust flow and provide fuel movement with primary air. The quality of the spray is determined by the front resistance of individual particles. The outer layers of the flow stream

30 mixtures leaving the burners,

additionally displaced by the kinetic energy of the swirling secondary air flow, which allows you to create the required flame opening angle in order to ensure stable gas recirculation to the root of the torch and, therefore, steady ignition of low-grade fuel. This eliminates slagging of the central pipe 2.

Gas nozzles 6, fuel oil 7 and pilot 9 nozzles are placed in channel 5 between pipes 2 and 3 for supplying primary and secondary air for structural considerations. The arrangement of gas nozzles 6 at an angle to the vertical creates a single non-intersecting torch when illuminated with natural gas

- at the nominal steam-generating capacity of the boiler when operating on low-grade solid fuel and the minimum value of heat loss q, and q ..

35

45

SS

Thus, the application of the proposed invention improves the quality of fuel combustion and the operational reliability of the burner.

YU

Compiled by L. Bulynko Editor L. Veselovska Tehred I. Veres

Order 1907/33

Circulation 515 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Proofreader G. Reshetnik

Claims (1)

COMBINED BURNER, containing a housing, central and peripheral pipes coaxially placed in it for supplying primary and secondary air, an annular gas manifold located in the channel between the pipes and equipped with nozzles, and an oil nozzle, distinguishing that, in order to improve the quality of fuel combustion and operational reliability, the burner additionally contains a pipe for supplying high-concentration dust introduced into the central pipe and an ignition nozzle, both nozzles being placed in the can les between pipes in the same horizontal plane, the nozzles of the gas collector has a lower portion 30 at an angle to the vertical, on the inner peripheral side wall of the tube formed vents and nozzle gas fuel atomizer manifold and mounted for longitudinal movement.