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A thermal power unit with low load no x Combustion optimization method and system

A combustion optimization, thermal power unit technology, applied in the combustion method, the use of a variety of fuel combustion, combustion types and other directions, can solve the problem of unconsidered, the denitration device cannot operate normally, the flue gas at the inlet of the denitration device is difficult to reach, etc., to reduce NOx The effect of content

Active Publication Date: 2022-05-27
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent document CN103423765 adopts a method for reducing NO X Air distribution coupled combustion method and system for emissions, which reduces NO by burning coal particles at an excess air ratio as low as possible X However, this plan does not take into account the fact that the flue gas temperature at the inlet of the denitrification device is relatively low at the current stage when the thermal power unit is under low load. Causing the denitrification device to fail to operate normally

Method used

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  • A thermal power unit with low load no <sub>x</sub> Combustion optimization method and system
  • A thermal power unit with low load no <sub>x</sub> Combustion optimization method and system
  • A thermal power unit with low load no <sub>x</sub> Combustion optimization method and system

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Embodiment 1

[0052] The present embodiment provides a thermal power unit low load NO X The combustion optimization method, taking the more common circular combustion boiler in China as the research object, can effectively reduce the no of the furnace outlet by adjusting the fuel volume, air volume, recirculated flue gas volume and exhaust air volume distribution of each burner in the combustible layer under the premise of reducing the impact on the inlet flue gas temperature and fuel exhaust rate of the low-load denitrification device of the thermal power unitX Content according to the present invention, such that the incoming fuel is concentrated in the middle area of the put-in-operation burner layer is injected, while the in-furnace air is concentrated in the upper and lower areas of the put-in-motion burner layer is injected.

[0053] See Attached Figure 2 Embodiments of the present invention discloses a thermal power unit low load NO X Flowchart of the combustion optimization method. The ...

Embodiment 2

[0105] See Attached Figure 6, is a kind of thermal power unit low load NO of the present invention X Schematic diagram of a combustion optimization system. The system of the present invention to the power station cut circle combustion boiler as the object of study, adjust the amount of fuel, air volume, recirculated flue gas volume, exhaust air volume distribution of each burner in operation burner layer, the system includes a metering system, a fuel volume control system, an air volume control system, a recirculated flue gas volume control system, a burndown air volume control system, a fuel volume adjustment system, a recirculated flue gas volume adjustment system and a burndown air volume adjustment system.

[0106] Metering system: the amount of fuel for each burner, the amount of air fuel, the amount of recirculated flue gas, the amount of exhaust air is calculated, the calculation formula is the same as Example 1.

[0107] Fuel quantity control system: the incoming fuel is i...

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Abstract

The invention discloses a thermal power unit low-load NO X Combustion optimization method and system. The system used in the present invention includes: metering system, fuel volume control system, air volume control system, recirculation flue gas volume control system, burnout air volume control system, fuel volume adjustment system, air volume adjustment system, recirculation flue gas volume adjustment system and Overfire air volume adjustment system. By adjusting the distribution of the fuel volume, air volume, recirculation flue gas volume, and burnout air volume of each burner, the present invention can effectively reduce the impact on the inlet flue gas temperature and fuel burnout rate of the low-load denitrification device of the thermal power unit as much as possible. Furnace outlet NO X content.

Description

Technical field [0001] The present invention belongs to the field of power station boiler technology, specifically a thermal power unit low load NO X Combustion optimization method and system. Background [0002] According to the "Emission Standards for Atmospheric Pollutants from Thermal Power Plants" (GB13223-2011) promulgated by the Ministry of Environmental Protection, thermal power units in key areas are NO X Emissions need to be controlled at 100 mg / Nm 3 At present, thermal power units use low NO X Combustion technology to meet the emission standards stipulated by the state. However, in recent years, China's UHV construction and renewable energy have developed rapidly, which has brought great challenges to the traditional power system. Because China's power supply structure is mainly thermal power, and the ordinary thermal power unit is based on the conventional load, the low-load operation of the thermal power unit often deviates from the design value, which makes the furn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23N1/02F23C5/08F23C5/24F23C7/00F23L9/00F23L1/00
CPCF23N1/022F23C5/08F23C5/24F23C7/00F23L9/00F23L1/00F23C2200/00F23C2201/20F23C2201/30
Inventor 童家麟郑建平樊印龙吕洪坤
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY