RU1809243C - Vertical prismatic furnace - Google Patents

Abstract

Use: in thermal power plants for staged burning of natural gas and fuel oil with minimal formation of nitrogen oxides in the flames of the combustion chamber. SUMMARY OF THE INVENTION: in a vertical prismatic firebox containing several rows of burners 1, 2, 3 mounted on its walls 4, over which secondary air nozzles 5 are located, nozzles 5 are rotatable relative to the cross-sectional plane of the furnace, with the nozzle turning angle 5 is -arctg 2l / b a + arctg 2l / b, where a is the angle of rotation of ctl 5 relative to the cross-sectional plane of the furnace, f is the height of the nozzles 5 above the upper rus of burners 3; b is the depth of the furnace. 1 ill.

Description

The invention relates to a power system and can be used primarily for the stepwise combustion of natural gas and fuel oil in thermal power plants with minimal generation of nitrogen oxides in the flames of the combustion chamber.

The aim of the invention is to reduce the emission of nitrogen oxides into the atmosphere over the entire range of fuel consumption.

The drawing shows a firebox, a longitudinal section.

The furnace device contains a counter-assembly of burner devices 1-3 mounted on its walls 1 in several rows located on the vertical walls 4.. Above the upper light-blue burners 3, nozzles 5 for introducing secondary air are mounted with the possibility of rotation relative to the plane of the cross-section of the furnace, the angle of rotation of the secondary air nozzles is

arctg -2l / b a + arctg 2l / b, where is the angle of rotation of the secondary air nozzles relative to the plane of the cross section of the furnace;

b is the height of the secondary air nozzles above the upper row of burners;

I - the depth of the furnace.

The furnace works as follows. Fuel enters through burner devices 1-3, air through air nozzles 5. As a result of their mixing, a burning torch is formed in the combustion chamber. For uniform distribution of air in the fuel. environment and for efficient fuel combustion, as well as temperature control

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of combustion products, secondary air is supplied at an angle of ± arctg 21 / b relative to the plane of the cross section of the furnace.

Due to the rotation of the air nozzles 5 relative to the cross-sectional plane of the furnace, circulation currents from the peripheral sections of the flames, including their end sections, appear in the zone between the burner devices 1-3. As a result of this, intense heating of fuel and air takes place in the root zone of flares and partial ballasting of these zones with products of complete and incomplete combustion. The warming up of the basal areas of the flare due to the added mass of combustible gases intensifies the burnout process, and running the flares with products of complete and incomplete combustion reduces the level of maximum temperatures in the flare.

.In turn, the dispersion of the maximum heat release zone helps to reduce the maximum supply flows to the heating screen surfaces. Torch ballasting reduces the formation of nitrogen oxides in the products of combustion, and also leads to a smooth control of the temperature of the products of combustion in front of the superheater.

Formula A vertical prismatic firebox containing several rows of burners mounted on its walls, above which secondary air nozzles are located, characterized in that, in order to deeply reduce emissions in atmosphere of nitrogen oxides over the entire range of fuel consumption changes, the secondary air nozzles are mounted with the possibility of rotation relative to the plane of the cross section of the furnace, while the angle of rotation of the secondary air nozzles is-arctg2l / b. "+ arctg 2l / b, where" is the angle of rotation of the nozzles secondary carriage ear relative to the cross sectional plane of the furnace; I is the height of the secondary air nozzles above the upper row of burners; b is the depth of the furnace.