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Efficient low NOx chain grate furnace coupled with swirling pulverized coal combustion and enhanced flue gas recirculation

A technology of flue gas recirculation and pulverized coal combustion, applied in the field of chain furnaces, can solve the problems of low thermal efficiency and high emissions of chain furnaces

Inactive Publication Date: 2018-11-27
NINGBO UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is in order to solve the low thermal efficiency of the chain furnace mentioned in the background technology and the NO x The problem of high emissions, thus providing a high-efficiency low-NO x chain furnace

Method used

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  • Efficient low NOx chain grate furnace coupled with swirling pulverized coal combustion and enhanced flue gas recirculation
  • Efficient low NOx chain grate furnace coupled with swirling pulverized coal combustion and enhanced flue gas recirculation

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Embodiment approach 1

[0012] combine figure 1 and figure 2 Describe this embodiment, a high-efficiency and low-NO x Chain furnace, the chain furnace is composed of furnace 1, coal feeder 2, fire grate 3, ash hopper 4 and tail flue 5; the furnace 1 is wrapped by front and rear walls and left and right side walls. The lower part of the wall is provided with a front furnace arch 10a and a rear furnace arch 10b for constructing a waist-shaped furnace structure; the space area wrapped by the grate 3 is arranged with a plurality of primary air chambers 9 arranged in a "one" shape, and the plurality of The outlet of each primary air chamber 9 communicates with the fire grate 3 to supply the primary air 9' needed for coal seam combustion on the fire grate 3; The area is provided with a plurality of front arch secondary air nozzles 11a and rear arch secondary air nozzles 11b arranged in a "one" shape along the furnace width direction, to supply the air required for the suspension combustion of fine coal ...

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Abstract

The invention discloses a high-efficiency low-NOx chain grate furnace coupled with swirling pulverized coal combustion and enhanced flue gas recycling, By reducing the fraction of combustion in gratezone, A low NOx swirl pulverize coal burner and a burned-out air are arrange on that left and right side walls, and an enhanced flue gas recirculation is constructed (i. E., flue gas recirculation isintroduce from a primary air chamber at the lower part of the grate, a front and rear arch secondary air burner and a swirl burner respectively), Deep-air staged low-nitrogen combustion conditions including horizontal staging and suspension staging and enhanced flue gas recirculation low-nitrogen combustion conditions are formed to significantly inhibit NOx formation. A low NOx swirl pulverize coal burner is added to increase that combustion fraction of the suspension combustion zone, Flue gas temperature level and hot air utilization ratio can reduce exhaust gas loss and increase fly ash burnout. In addition, reasonable distribution of flue gas in grate combustion zone and reduction of combustion share can help to improve slag burnout rate, thus achieving the effect of significantly improving boiler thermal efficiency.

Description

technical field [0001] The invention relates to a chain furnace, in particular to a high-efficiency and low-NO furnace coupled with swirl pulverized coal combustion and enhanced flue gas recirculation x A chain furnace belongs to the technical field of chain furnace combustion. Background technique [0002] my country's coal-fired industrial boilers have the characteristics of large number (more than 600,000 units), small capacity, and scattered distribution. They are mainly chain furnaces and fluidized bed boilers (the market share of chain furnaces accounts for about 60%). The chain furnace mainly adopts the combustion mode of layer combustion (the proportion of layer combustion is about 90%, and the proportion of suspension combustion is about 10%). Its technical characteristics and main problems in operation are: (1) most of the wind required for combustion is from The hot coarse coal particles (millimeter-centimeter coal particles) fed into the lower part of the coal s...

Claims

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Application Information

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IPC IPC(8): F23B30/08F23L1/00F23L9/00F23K3/00
CPCF23B30/08F23K3/00F23L1/00F23L9/00
Inventor 况敏杨国华王金鑫遆曙光王振锋
Owner NINGBO UNIV
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