SU1208413A1 - Method of fuel combustion - Google Patents

Description

The invention relates to energy j, in particular, to methods for burning fuel, and can be used in boiler furnaces with a counter-arrangement of burners,

The purpose of the invention is to increase profitability by reducing the concentration of toxic emissions in the combustion products

Fig. „1 depicts the proposed topmae transverse section along the axis of the burners; Fig. 2 shows a cross section of the furnace at a distance of 8-10 equivalent torch diameters from the section of Fig. 1.

The device contains a firebox 1 with counter installed in it; for example, vortex burners 2, on the axis of which plane-jet nozzles 3 are placed, connected to water pipeline 4. At the height of the firebox 1, equal to 8-10 equivalent diameters of the burner 2.5 are tired in the hatches 5 the same n: raskostroynye nozzles 6 for supplying water

The fuel air mixture is supplied to the combustion chamber 1 through the vortex burners 2 ". At the same time, pipeline 4 through nozzles 3 is supplied with a flat jet of water to cover the area of the fire chamber at the root of the torch

to improve the combustion process and

pressure fuel oxides of nitrogen

and through the nozzle 6 - to the zone of maximum n-h e er. a tour to reduce the temperature of the flare and the corresponding reduction in the formation of nitrogen oxides,

PRI me R. Input of water according to the pre ... t: a modem at the method is justified by the results of tests carried out on the boiler

TRG

The tests are carried out at

working boilers with loads of 280 MW with different fuel-to-fuel ratios when burning hydrogen sulphide-containing natural gas, Tested with eight options for gas combustion. "Checks the operation of the boiler with different methods of injecting water into the top-set. method of shower b and water consumption, contributing to the reduction of harmful) emissions and intensification, which burns the combustion process

1 option. The water supply is carried out to the root of the torch along the axis of the central burners 2 and through the nozzles 6 in the holes 5 at the level of nine equivalent diameters of the burner to the zone

five

0 .5

about

r

0

five

CI

maximum temperatures. A decrease in C jig is observed by 30%

P option. Water is supplied to the torch root along the axis of the central burners.2 through nozzles 6 in side hatches 5 at the level of three equal volatile burner diameters and through nozzles 6 in front and back hatches 5 at the level of nine equivalent burner diameters to the zone of maximum temperatures , CUQ reduction is observed by 30%.

The last two options give a good effect, but in the first version the water consumption is less.

Thus, from the studies carried out, it can be seen that water input with a two-jet scheme reduces nitrogen oxide emissions by an average of 30%, and water input along the axis of central burners 2 and through nozzles 6 in front and rear hatches 5 the nine equivalent burner diameters are the most efficient,

When installing nozzles 5 on the rac--. If the stove is larger than ten times the equivalent diameter of the burner, the water that is filled to a certain size of the droplets can evaporate without reaching the zone m: maximum temperatures, and thus the effect of suppressing the formation of nitrogen oxides is reduced.

When installing the nozzles 5 at a distance of less than eight equivalent burner diameters, the high-temperature zone can be higher and there is no significant water impact on it; and, therefore, the effect of the CHi-pencion is reduced,

Experiments were conducted at different

water consumption, fuel ratios and various ratios of water velocity to gas velocity in the furnace.

Studies have shown that the efficiency of water injection significantly depends on the ratio between the relative speed of the supplied water droplets and the velocity of the flue gases in the furnace,

During the tests, it was established that the water injected into the furnace in a collision with moving ra3aNffl: undergoes secondary crushing in the furnace (primary - in nozzles),. those. the fragmentation of water into caps. -; depends on the velocity of the gases in the furnace, which is regulated by the pressure of the supplied fuel and air. By adjusting the pressure of water injected into the firebox and by changing the speed of the droplets flying, the ratio of the speeds of flying of the water droplets and the movement of gases in the firebox was established, equal to 0.3-0.8, at which the maximum reduction in the formation of nitrogen oxides is observed.

When the value of this ratio is less than 0.3, characteristic of large water droplets, the latter are subjected to secondary crushing by a gas stream, as a result of which small fragments are formed, evaporated. Editor T. Miteiko

Order 238/51 Circulation 515 Subscription VNIIPI USSR State Committee

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

Branch PSh1 Patent, Uzhgorod, Proektna St., 4

2084134

mainly at the initial part of the plume until the active formation of nitrogen oxides. If this ratio is more than 0.8, which is typical for very small water droplets, your evaporation also occurs mainly until reaching the zone of active formation of nitrogen oxides. Tests have shown that

In the range of the ratio 0.3-0.8, nitrogen oxides decrease by 3–4% by 1% of the ratio of moisture and fuel consumption. With an increase in this ratio of more than 0.8 and a decrease) 5 scientific research institutes of less than 0.3, the effect decreases 1.5-2.5 times.

PU8. 2

Compiled by E. Yazykov

Tehred O. Vashchishin Proofreader I. Musk

Claims (1)

METHOD FOR FUEL COMBUSTION in the combustion chamber of the boiler by feeding air-fuel mixture flows into the combustion zone with the formation of a torch and a zone of maximum temperature and introducing water in several jets into the root of the torch and into the maximum temperature zone, characterized in that, in order to increase efficiency by reducing the concentration of toxic emissions in combustion products, water jets supplied to the flame root are directed along the axis of the air-fuel mixture flows, and to the maximum temperature zone in parallel with the first, and the speed of the jets is They are equal to 0.3 - 0.8 g of gas velocity in the combustion chamber. > 1 1208413