Combustion device for tangentially fired boiler and ultralow NOx combustion method employing same

A technology for combustion devices and boilers, which is applied in the direction of combustion methods, burners for burning powder fuel, burners, etc., and can solve problems such as inability to strengthen the NO reduction process, low NO reduction temperature, and incomplete combustion of pulverized coal, so as to avoid furnace Internal negative problems, reducing NOX concentration, reducing the effect of initial investment cost and operating cost

Active Publication Date: 2014-03-12
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing overall deep air classification technology in the furnace adopts the method of reducing the excess air coefficient in the main combustion zone as a whole to suppress NO X After reducing the air volume in the main combustion zone, the pulverized coal combustion is incomplete, and the NO reduction temperature is low, which cannot strengthen the NO reduction process. At the same time, the too low combustion temperature is not conducive to the burnout of pulverized coal

Method used

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  • Combustion device for tangentially fired boiler and ultralow NOx combustion method employing same
  • Combustion device for tangentially fired boiler and ultralow NOx combustion method employing same
  • Combustion device for tangentially fired boiler and ultralow NOx combustion method employing same

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Embodiment 1

[0030] combine figure 1 , figure 2 , image 3 Describe this embodiment mode, this embodiment adopts the primary air burner with upper concentration and lower lightness with intermediate secondary air. The burner 16 and the main burner 15, the high burner 17 corresponds to the burnout zone, the low burner 16 corresponds to the reduction zone, and the main burner 15 corresponds to the main combustion zone. The furnace is divided along the height direction, thereby realizing the depth along the furnace height direction. Air classification, optimal design of excess air coefficient in each area.

[0031] The main burner 15 comprises a thick and light primary air pulverized coal burner 181 and a secondary air pulverized coal burner 182 arranged on the primary air pulverized coal burner 181, and the secondary air pulverized coal burner 182 corresponds to the secondary air spout 10, so The primary air pulverized coal burner 181 is a bifurcated pipe, and the front end of the bifurc...

Embodiment 2

[0043] combine figure 1 , figure 2 , Figure 4 Describe this embodiment, this embodiment adopts the primary air burner with upper light and lower concentration of secondary air in the middle, and other arrangement methods are the same as in embodiment 1.

Embodiment 3

[0045] combine figure 1 , figure 2 , Figure 5 To illustrate this embodiment, this embodiment adopts the combined arrangement of the upper-concentrated and lower-diluted primary air burner with the middle secondary air and the upper-diluted and lower-concentrated primary air burner. The combined arrangement method is not limited to the illustration, and other arrangement methods Same as Example 1.

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Abstract

The utility model discloses a combustion device for a tangentially fired boiler and an ultralow NOx combustion method employing same. A high-position burner, a low-position burner and a main burner are arranged on a hearth from top to bottom; the space between the low-position burner and the main burner is H2, the main burner comprises dense-dilute primary air pulverized coal burners and secondary air pulverized coal burners arranged at the upper parts and the lower parts of the dense-dilute primary air pulverized coal burners, wherein the secondary air pulverized coal burners correspond to secondary air nozzles, the dense-dilute primary air pulverized coal burners are bifurcated pipes, light-phase primary air nozzles and dense-phase primary air nozzles are arranged at the front ends of the bifurcated pipes respectively, and middle secondary air nozzles are arranged between the light-phase primary air nozzles and the dense-phase primary air nozzles; and the main burner comprises an upper group of burners and a lower group of burners, and the space between the upper group of burners and the lower group of burners is H1. The characteristic of divided layer blowing in the horizontal direction is reflected, mixing the secondary air is delayed, the purpose of supplying air on the same layer by grading is achieved, mixing O2 is delayed, the production of NOx is inhibited, and the efficiency of the boiler is ensured not to be reduced.

Description

technical field [0001] The invention relates to a tangential boiler combustion device and an ultra-low nitrogen combustion method, belonging to the technical field of tangential boilers. Background technique [0002] my country is a developing country that uses coal as its main energy source. Coal resources account for about 75% of my country's total energy production and consumption. During the combustion of coal, a large number of pollutants will be produced, among which nitrogen oxides (NO X ) is extremely harmful to the environment. In addition to forming acid rain and destroying the ecological environment, nitrogen oxides can also form photochemical smog that endangers human health. High temperature combustion of coal is NO X One of the main sources of coal-fired power plant boilers in my country, and coal-fired power plant boilers are mainly used, so reducing the NO of coal-fired power plant boilers X emissions are of great significance. [0003] At present, contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C5/08F23D1/00F23L9/02
Inventor 刘泰生王勇代婕周武陈灿冉燊铭马晓伟
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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