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Industrial pulverized coal boiler exhaust gas recycling low-nitrogen combustion method and system

A flue gas recirculation and pulverized coal boiler technology, applied in the direction of combustion method, flue gas combustion, combustion type, etc., can solve the problems of unstable flame and low burnout rate, achieve simple structure, reduce pollution, reduce power and The effect of operating energy consumption

Active Publication Date: 2016-12-21
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects of the prior art, the technical problem to be solved by the present invention is to provide an industrial pulverized coal boiler flue gas recirculation low-nitrogen combustion method and system to solve the problem of coal combustion producing a large amount of NO X without the problems of ignition difficulties, flame instability and / or low burnout due to lower coal quality

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  • Industrial pulverized coal boiler exhaust gas recycling low-nitrogen combustion method and system
  • Industrial pulverized coal boiler exhaust gas recycling low-nitrogen combustion method and system
  • Industrial pulverized coal boiler exhaust gas recycling low-nitrogen combustion method and system

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Embodiment Construction

[0021] Such as figure 1 As shown, the flue gas recirculation low-nitrogen combustion system of an industrial pulverized coal boiler includes: a primary fan 1, a pulverized coal bin 4, a powder feeder 3, a third mixer 2, a first mixer 5, an oxygen meter 6, and a thermometer 7 , boiler, secondary fan 14, recirculation fan 13, second mixer 12, dust collector 15, induced draft fan 16 and chimney 17. The boiler includes a swirl burner 8 , a furnace 9 and an air preheater 10 . The arrows in the figure indicate the airflow direction.

[0022] The pulverized coal bin 4, the powder feeder 3, and the third mixer 2 are connected in sequence. The primary blower 1 is connected with the first mixer 5 through the third mixer 2 . The first mixer 5 is connected to the swirl burner 8 and the second mixer 12 respectively. The oxygen meter 6 and the thermometer 7 are arranged between the connecting pipeline of the first mixer 5 and the swirl burner 8, and are respectively used for measuring ...

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Abstract

The invention discloses an industrial pulverized coal boiler exhaust gas recycling low-nitrogen combustion method. The method includes: using a part of exhaust gas extracted by a recycling fan as circulation exhaust gas, mixing the circulation exhaust gas and a part of high-temperature secondary wind, and then mixing the exhaust gas, the high-temperature secondary wind and a primary wind with pulverized coal; adjusting the amount of the extracted circulation exhaust gas according to the detected oxygen content of the mixed gas of the three kinds of gas, and then adjusting the oxygen content of pulverized coal airstreams entering a combustor; and adjusting the amount of the high-temperature secondary wind mixing with the circulation exhaust gas according to the detected temperature of the mixed gas of the three kinds of gas, and then adjusting the temperature of gas entering the combustor. The invention also discloses an industrial pulverized coal boiler exhaust gas recycling low-nitrogen combustion system which includes a primary fan, a first mixer, a boiler, a recycling fan, a second mixer and a secondary fan, wherein the boiler includes a combustor, a boiler chamber and an air pre-heating device, and an oxygen content meter and a thermometer are arranged between the first mixer and the combustor. The method and the system can improve the stability of pulverized coal combustion on the premise of an equal emission reduction effect.

Description

technical field [0001] The invention belongs to the technical field of coal combustion pollutant emission reduction control, and in particular relates to an industrial pulverized coal boiler flue gas recirculation low-nitrogen combustion method and system. Background technique [0002] As one of the main causes of air pollution, photochemical smog, acid rain and greenhouse effect, nitrogen oxides (NOx) control has become the focus of attention and research. my country's NO in 2014 X The total emissions reached 20.78 million tons, 70% of which came from coal combustion, so coal combustion is the main source of NOx emissions. According to the latest "Emission Standards of Air Pollutants for Boilers", from July 2014, NO X emissions must be reduced to 100mg / m 3 Below, for some developed cities, the pollutant discharge level is required to be higher, and some areas require the NOx emission concentration to be lower than 100mg / Nm 3 , while the conventional NOx emission level o...

Claims

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Application Information

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IPC IPC(8): F23J15/02F23C10/00F23C10/20F23L15/00F23L9/00F23L13/00
CPCF23C10/002F23C10/20F23C2202/30F23J15/022F23J2217/00F23L9/00F23L13/00F23L15/00Y02E20/34
Inventor 刘建国刘加勋韩向新姜秀民
Owner SHANGHAI JIAO TONG UNIV
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