RU1815486C - Furnace - Google Patents

Abstract

Usage: when burning solid fuel in thermal power plants. In the section of the vertical prismatic chamber 1, the combustion is pulverized. .. : :-.- 5 . :. 7 burners, consisting of a vertically slotted nozzle (C) 2 air mixtures and located at the same level with the gap 3 of the air supply device formed by the inner and outer vertically slotted nozzles (П) 5 and 6. П б are installed with an inclination in the horizontal plane to their P 5 at an acute angle a and to C 2 at an acute angle / less than a. С 2, П 5, 6 are directed tangentially to conditional circles with diameters respectively da. da, di, and di da da. P 5 and 6 are oriented along the path with C 2. Through C 2, an air mixture is fed into the furnace, through P 5, 6 - second

Description

ric air. The fuel is mixed with secondary air in the interior of the furnace and burns in a whirlpool. Due to the distribution of secondary air in the furnace in the form of a system of resulting jets generated from the collision of air flows at the outlet of P 5, 6, it is possible to change the direction of these jets over a fairly wide range due to the redistribution of air between P 5 and 6 and thereby change the location in the furnace of the zones from where the process of displacement of the jets of the primary air mixture with the secondary air begins. 3 ill.

The invention relates to the field of solid fuel combustion and can be used in thermal power plants.

The aim of the invention is to expand the control range of the parameters of the combustion process and to ensure stable torch twist in all modes.

Figure 1 shows a firebox, a cross section; figure 2 is a view a in figure 1; -on fig.Z - section bB in figure 1.

The furnace contains a vertical prismatic combustion chamber T, in the cross section of which there are pulverized coal burners, consisting of a vertically slotted nozzle 2 of the air mixture and located at the same level with the gap 3 of the air supply device 4, formed by the inner and outer vertically slotted nozzles 5 and 6. The outer nozzles 6 are installed with an inclination in the horizontal plane to their inner nozzles 5 at an acute angle to the nozzles 2 of the aerosol mixture at an acute angle /, the value of which is less than the value of the angle a. Aerosol nozzles 2, internal and external nozzles 5 and b are directed tangentially to conditional circles with diameters da, da, di. The diameter d2 of the circle to which the nozzles 2 of the air mixture are directed is larger than the diameter dt of the circle to which the nozzles are directed. The inner and outer nozzles 5 and 6 are oriented along the nozzles 2 of the mixture. Nozzles 2 are connected to the primary air sources 7 and communicated with fuel sources (not shown) through channels 8. The burners in the furnace can be located in several stages.

The furnace works as follows.

Air mixture in the form of coal dust and primary air is fed into the furnace space through nozzles 2, and secondary air is supplied through nozzles 5 and 6. Upon exit to the furnace, the jets of the mixture develop independently at first, while the oxidizing agent contained in the primary air is used to burn volatiles and dust. Behind the ignition section, secondary air is connected to the burning jets of fuel, which is distributed in the furnace as a system of resulting smoke and generated from the confluence of colliding air flows at the outlet of nozzles 5, 6. The final combustion of the fuel occurs in a vortex flame.

The combustion process is controlled by changing the angular position of the resulting air jets in the combustion chamber. In the proposed furnace, due to the redistribution of air between the nozzles 5, 6, the resulting jets can be directed towards the nozzles 2 of the air mixture, in parallel with these nozzles and s. a lapel away from them, Accordingly, the location in the furnace of the zones changes, from where the process of mixing the jets of the primary air mixture with the secondary air begins, which allows a sufficiently wide range to affect such parameters of the combustion process as the temperature of the gases, the concentration of air and fuel, etc. . Thanks to the fact that the nozzles 5, b are oriented along the nozzles 2, a stable twist of the torch is ensured in all modes.

Compared to the prototype firebox, the proposed firebox allows:

a range of control parameters of the combustion process; to provide optimal setting of the furnace mode when changing the characteristics of the fuel; increase the reliability of the furnace by eliminating

modes with loss of torch twist. Formula of the invention A furnace containing a vertical prismatic combustion chamber, in the cross section of which in the corners there are dust-coal burners, consisting of an air mixture nozzle and located at the same level with the gap of the air supply device formed by internal and external branch pipes, the last of which

installed in a horizontal plane to the inner nozzle and to the nozzle of the mixture at sharp angles, with all the outer and inner nozzles, as well as nozzles of the mixture are made vertically slotted and

directed tangentially to the respective conditional circles, and the internal nozzles are oriented along the way with the nozzles of the air mixture, characterized in that, in order to expand the range of regulation of the parameters of the combustion process and

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providing in all modes of stable detecting nozzles to the nozzles of the mixture of air mixtures a torch twist, the conditional circumference is smaller than the angle of inclination of these nozzles to the inside, to which the nozzles of the mixture are directed, to the earlier nozzles, while the outside patches are larger than the diameter of the circle, to which the cutting also outer nozzles are oriented along the nozzles along the way, inclination angle is 5 aerosol mixtures.

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