SU1366786A1 - Furnace - Google Patents

Abstract

Invention m. used in thermal power plants. The purpose of the invention is to increase the efficiency and reduce the content of nitrogen oxides in flue gases. Additional burners (DG) 5 are placed horizontally at an acute angle to the axis of the combustion chamber 2 passing through the front wall 6. The main nozzles 7 of the secondary blow are located on the wall 6 above the DG, and the nozzles 9 of the tertiary blow below the DG above the main burners (Exhaust gas ) 4 and tilted with the intersection of their axes with the axes of the exhaust gas. Additional nozzles 8 of the secondary blow are placed above the exhaust gas 4, below DG 5 and above the nozzles 9 of the tertiary blow and are made as a group of slotted ducts located between the tubes of the screens, while the longitudinal axes of the ducts are parallel to the exhaust axis 4. occurs due to the organization of three-stage combustion. 7 il. with S (L

Description

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This invention relates to a fuel combustion technique and can be used in thermal power plants.

The purpose of the invention is to increase the efficiency and reduce the content of nitrogen oxides in flue gases.

Figure 1 shows the furnace, a longitudinal section; FIG. 2 is a section A-A in FIG. figure 3 - view B in Fig, 2; figure 4 - section bb In fig.Z; figure 5 - section GGD fig.Z; figure 6 - node I in figure 5; Fig.7 - section EE of Fig.Z.

The firebox contains a combustion chamber shielded by steam generating pipes 1, chamber 2 with counter-mounted 3 main burners 4, additional burners 5 mounted on the front wall above main burners 4 and at: an acute angle to the axis of the combustion chamber 2 passing through wall 6.

The combustion chamber 2 is provided with the main 7 and additional 8 nozzles of the secondary blowing and nozzles 9 of the tertiary blowing. The main nozzles 7 of the secondary blowing are placed on the front wall 6 of the chamber 2 above the additional burners 5, the nozzles 9 of the tertiary blowing, are placed on the wall 6 below the burners 5 above the main burners 4 and are inclined downwards intersecting their axes with the axes of the main burners 4. Additional nozzles 8 secondary blow placed above the main burners 4 below the additional burners 5 and made as a group of slotted ducts 10 located in the gaps between the pipes 1 of the walls 3 walls. The longitudinal axes of the ducts 10 are parallel to the axes of the main burners 4 Air ode nozzles 7-9 are provided with the vanes 11.

The burner operates as follows. Air is supplied to the burners 4 and 5 and the nozzles 7-9. The burners 4 and 5 also supply fuel (gas or fuel oil). As a result of ignition, a flame is formed in the combustion chamber 2, which, due to radiation, heat the steam generating gases 1. When gas and fuel oil are burned in constant proportion, the change in load leads to a redistribution of the radiation and convective components of heat exchange. Increasing the proportion of the radiation component while reducing the load reduces the temperature

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steam behind a convective superheater. In connection with this, the temperature of the vapor during combustion of the matt, which has higher emission properties, decreases, and it increases during the combustion of gas. When operating a gas furnace with the help of {regulating gates 11, they provide | step burning by regulating the air supply to the nozzles 7–9. At the same time, the nozzles 9 of the tertiary blow more are opened, the air jets are directed downwards into the plugs of the main burners 4, and the nozzles 7 and 8 of the secondary blow operate with a minimum load of air flow. Thus, by forming additional torches 5 front torches in the center of the furnace due to the reversal of subsequent torches at an acute angle to the longitudinal axis and pressing the side torches down, they create conditions for braking the high-temperature torch core in the lower part of the furnace and maintain

5 steam temperature is normal in the mode of separate combustion of natural gas. The nozzles 9 of the tertiary blow affect the lowering of the torches of the main burners 4. When fuel oil is burned, the gate 11 of the nozzles 7 and 8 is opened to a greater extent, and the gate 11 of the nozzles 9 are covered to a minimum, providing conditions that prevent their burning. 5 rises and the steam temperature rises. By making the nozzles 8 as a group of slotted ducts 10, this effect is enhanced under the influence of the boundary layer of the oil burner of the main burners 4 being sprayed by small jets of air.

Installing the nozzles 8 in height between the nozzles 9 of the tertiary blowing and the burners 5 allows for the implementation of Stu45 foam-burning, which ensures a reduction in concentration and also simplifies their placement without distributing the side screens.

In order to further enhance

gg of the effect of the nozzle 8 secondary blow with their axes are oriented parallel to the longitudinal axis of the front burners 4. In the joint combustion mode, gas is burned in the main burners 4, and fuel is burned in the additional burners 5. At the same time, with the help of regulating gates 11, the temperature of superheated steam regulated by the conditions of the boiler operation is ensured.

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Claims (1)

Formula.la invention A furnace containing a tube shielded combustion chamber with main burners placed opposite to its side walls, and additional burners placed on the front wall above the main burners,. characterized in that, in order to increase efficiency and reduce the content of nitrogen oxides in flue gases, IF ki are placed horizontally at an acute angle to the axis of the combustion chamber passing through the front wall, and the combustion chamber, in addition, is equipped with primary and secondary secondary blast nozzles and tertiary blast nozzles, the main secondary blast nozzles being placed on the front wall of the chamber above the additional burners, tertiary nozzles ^{: the} nozzles are also located on the front wall under the additional burners above the main burners and are inclined with the intersection of their axes with the axes of the main burners, and additional nozzles of the secondary blasts are placed above the main burners below the additional burners and above the tertiary blast nozzles and are made in the form of a group of slotted ducts located between the tubes of the screens, while the longitudinal axes of the ducts are parallel to the axes of the main burners. extra burned 7βσσ yr fie. 5 7