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A low NOx combustion system for flue gas recirculation and ultra-fine pulverized coal staged gasification

A technology of flue gas recirculation and combustion system, applied in the direction of staged combustion, flue gas combustion, combustion type, etc., can solve the problem of high investment cost, achieve the effect of low investment cost, reduce oxygen content, and reduce NOX generation

Active Publication Date: 2020-03-31
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, coal-fired power plants at home and abroad reduce NO X The main technologies for emission include air staged combustion technology and tail flue gas SCR denitrification technology. Tail flue gas SCR denitrification technology generally reduces NO X The removal efficiency can reach more than 80%, but the investment cost is too high

Method used

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  • A low NOx combustion system for flue gas recirculation and ultra-fine pulverized coal staged gasification
  • A low NOx combustion system for flue gas recirculation and ultra-fine pulverized coal staged gasification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]The primary pulverized coal enters the gasification furnace 2 through the primary fuel gasification nozzle 3, and the excess air coefficient in the gasification furnace 2 is guaranteed to be 0.2 by adjusting the air volume and the recirculation flue gas volume; the secondary pulverized coal enters through the secondary fuel combustion nozzle 5 The combustion furnace 4, the circulating flue gas enters the combustion furnace 4 through the circulating flue gas nozzle 8, ensuring that the excess air ratio in the combustion furnace 4 is 0.9; the unburned reducing gas and coke rise into the burnout zone, and the burnout air is burnt out from the top The air nozzle 6 enters the burnout area, and is fully mixed and burned out; the flue gas after combustion enters the flue 7, and part of the flue gas enters the flue gas pipe 10 through the flue gas outlet 11 on the side wall of the flue 7, and then passes through the circulating flue gas nozzle 8 Enter the gasification furnace 2 a...

Embodiment 2

[0033] The primary pulverized coal enters the gasification furnace 2 through the primary fuel gasification nozzle 3, and the excess air coefficient in the gasification furnace 2 is guaranteed to be 0.3 by adjusting the air volume and the recirculation flue gas volume; the secondary pulverized coal enters through the secondary fuel combustion nozzle 5 The combustion furnace 4, the circulating flue gas enters the combustion furnace 4 through the circulating flue gas nozzle 8, ensuring that the excess air coefficient in the combustion furnace 4 is 0.85; the unburned reducing gas and coke rise into the burnout zone, and the burnout air is burnt out from the top The air nozzle 6 enters the burnout area, and is fully mixed and burned out; the flue gas after combustion enters the flue 7, and part of the flue gas enters the flue gas pipe 10 through the flue gas outlet 11 on the side wall of the flue 7, and then passes through the circulating flue gas nozzle 8 Enter the gasification fur...

Embodiment 3

[0035] The primary pulverized coal enters the gasification furnace 2 through the primary fuel gasification nozzle 3, and the excess air coefficient in the gasification furnace 2 is guaranteed to be 0.5 by adjusting the air volume and the recirculation flue gas volume; the secondary pulverized coal enters through the secondary fuel combustion nozzle 5 Combustion furnace 4, the circulating flue gas enters the combustion furnace 4 through the circulating flue gas nozzle 8, ensuring that the excess air ratio in the combustion furnace 4 is 0.8; the unburned reducing gas and coke rise into the burnout zone, and the burnout air is burnt out from the top The air nozzle 6 enters the burnout area, and is fully mixed and burned out; the flue gas after combustion enters the flue 7, and part of the flue gas enters the flue gas pipe 10 through the flue gas outlet 11 on the side wall of the flue 7, and then passes through the circulating flue gas nozzle 8 Enter the gasification furnace 2 and ...

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Abstract

The invention discloses a flue gas recirculation and superfine coal powder graded gasification low NOx combustion system, belongs to the technical field of thermal energy and power engineering, and relates to a coal powder graded combustion and environmental protection system, including a furnace for processing coal powder The furnace is divided into a gasification furnace and a combustion furnace from bottom to top. The combustion furnace includes a combustion zone and a burnout zone; the wall of the gasification furnace is provided with a primary fuel gasification nozzle, and the wall of the combustion zone is provided with a secondary pulverized coal entering the furnace. The secondary fuel combustion nozzle, the wall of the burnout area is equipped with a top burnout air jet; the tail of the burnout area is connected with a flue, and the tail of the flue is provided with a flue gas outlet, and the flue gas outlet is connected with the flue gas pipe. The flue gas enters the furnace through the flue gas pipe through the circulating flue gas nozzle on the side wall of the furnace. A flue gas butterfly valve is installed at the circulating flue gas nozzle to control the flow rate. Through the hierarchical gasification and combustion technology and the flue gas recirculation technology, the Pulverized coal combustion efficiency, and reduce NOx generation.

Description

【Technical field】 [0001] The invention belongs to the technical field of thermal energy and power engineering, and relates to a pulverized coal graded combustion and environmental protection system, in particular to a flue gas recirculation and superfine coal powder graded gasification low NOx combustion system. 【Background technique】 [0002] Nitrogen oxides are the main source of acid rain, greenhouse effect and photochemical smog, which have seriously affected people's living environment and become the focus of attention. NO X The total emissions reached 20.78 million tons in 2014, nearly half of which came from thermal power plants. For this reason, the "Coal Power Energy Conservation and Emission Reduction Upgrading and Transformation Action Plan" proposes that the NOx emission concentration of newly built coal-fired power generation units in the eastern, central and western regions of my country should basically reach, in principle approach or reach, and encourage to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C7/02F23C9/06
CPCF23C7/02F23C9/06F23C2201/101F23C2201/30F23C2202/50
Inventor 牛艳青李帅飞惠世恩王帅
Owner XI AN JIAOTONG UNIV