Method for combusting fuel reburning low-nitrogen oxide

A technology of nitrogen oxides and fuel, applied in the field of clean combustion of coal-fired boilers, can solve the problems of small mixing space of nitrogen oxides and reducing substances, difficult source of ultra-fine coal powder, low denitrification efficiency, etc., and achieve good flue gas mixing effect , The reduction reaction time is long, and the effect of enhancing the mixing effect

Active Publication Date: 2011-11-23
徐州燃烧控制研究院有限公司
View PDF6 Cites 36 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for fuel reburning with low nitrogen oxides to solve the problem of reburning requiring specially ground ultra-fine pulverized coal, and the source of ultra-fine pulverized coal is difficult; air is a powder feeding medium with high oxygen co

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for combusting fuel reburning low-nitrogen oxide
  • Method for combusting fuel reburning low-nitrogen oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Example 1: This system adopts the method of fuel reburning and low nitrogen oxide combustion. The system mainly includes a five-layer coal feeder 1, a five-layer coal mill 2, a four-layer coal feeder 3, a four-layer coal mill 4, a furnace 5, and a total of 5 layers of burners from bottom to top from 6 to 10, of which 9 The two-layer burners and 10 are collectively referred to as the upper burner, burn-off air 11, air preheater 12, dust collector 13, chimney 14, flue gas secondary fan 15, flue gas primary fan 16, hot primary air main pipe 17, cooling Primary air main pipe 18 and connecting pipes and damper baffles between various devices. One low-temperature flue gas is taken from the boiler tail dust collector 13 and divided into two paths, one of which is pressurized by the flue gas primary fan 16 and then mixed with a high-temperature air from the hot primary air main pipe 17 to form a secondary medium wind; The second-medium air enters the five-layer coal mill 2 and ...

Embodiment 2

[0045] Embodiment 2: The powder feeding by the two-medium air is as follows: ② After the flue gas and air are mixed, the two-medium air is formed as the primary air to carry the incoming powder to the powder machine and then sent to the furnace through the reburning fuel nozzle. Others are the same as in Example 1.

Embodiment 3

[0046] Embodiment 3: The powder feeding by the two-medium air is ③ the flue gas and the hot primary air are mixed to form the two-medium air as the drying medium of the coal mill to carry the coal powder and send it into the furnace through the reburning fuel nozzle. Others are the same as in Example 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for combusting a fuel reburning low-nitrogen oxide and belongs to a clean combustion method for a coal-fired boiler. Secondary medium air is used as a powder conveying medium of a combustor on the upper layer of the main combustion area of the boiler, coal powder used as a reburning fuel is conveyed into the boiler, the secondary medium air is used as distributed air of the combustor, the secondary air of the combustor on the upper layer is reduced correspondingly, the distributed air in the reburning area is reduced correspondingly, low excess air combustion is formed, the distributed air in a hearth is not enough, and finally over fire air (OFA) complements the required air; and the mixed medium of air and fuel gas is used as the conveying medium of the coal powder of the combustor of the upper layer, and the coal powder with the conventional fineness is conveyed into the boiler from the combustor on the upper layer by using a coal mill and a powder making system and is re-burnt and denitrated, and is burnt out by OFA. The problem that the reburning fuel and the fuel gas are not mixed uniformly, the reduction time is short, and the denitration efficiency is low is solved, the original design working conditions of maximum continuous evaporation capacity of the boiler and the like are not influenced, transformation is easy to realize, and the running cost is low.

Description

technical field [0001] The invention relates to a method for clean combustion of a coal-fired boiler, in particular to a method for fuel reburning and low-nitrogen oxide combustion. Background technique [0002] Combustion of pulverized coal in thermal power stations is currently the main source of nitrogen oxides. Currently, developed countries mainly use selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) to remove nitrogen oxides. The focus of domestic research is on removal through organized combustion in the furnace, including low-nitrogen burners, fuel concentration separation, air classification, fuel classification and recombustion technology, flue gas recirculation, etc. However, the actual denitrification efficiency of the reburning technology is much lower than that of the laboratory. The reburning denitrification efficiency on the test bench can reach more than 70%, while the actual operation of large boilers has proved that it can on...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F23C9/06F23C7/00
Inventor 任国宏雍占锋李永堂蒋允刚程怀志高克迎
Owner 徐州燃烧控制研究院有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap