Method for re-circulating combustion of flue gas of pulverized coal fired boiler

A flue gas recirculation and pulverized coal boiler technology, applied in the direction of combustion method, burner, combustion type, etc., can solve the problems of poor burnout and low thermal efficiency, achieve enhanced convective heat transfer, increase boiler steam temperature, Effect of reducing capture and collection costs

Inactive Publication Date: 2010-09-22
HUAZHONG UNIV OF SCI & TECH
View PDF5 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a pulverized coal boiler flue gas recirculation combustion method to solve the problem of existing pulverized coal O 2 and CO 2 Problems of low thermal efficiency and poor burnout performance of cyclic combustion method

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 re-circulating combustion of flue gas of pulverized coal fired boiler
  • Method for re-circulating combustion of flue gas of pulverized coal fired boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Ignition and combustion step: use the circulating flue gas to transport pulverized coal to the furnace, and at the same time, separate the air to obtain O 2 into the furnace, ignited and burned;

[0022] Flue gas circulation steps: the high-temperature flue gas produced by the combustion of pulverized coal in the furnace is divided into two parts. The first part of high-temperature flue gas accounts for 30% of the total high-temperature flue gas volume. After cooling, dust removal and desulfurization, it is compressed into liquid CO 2 ;The second part of high-temperature flue gas accounts for 70% of the volume of all high-temperature flue gas, which is used as circulating flue gas;

[0023] The second part of high-temperature flue gas is further divided into two paths: the first path of high-temperature flue gas accounts for 60% of the volume of circulating flue gas. Income O 2 Enter the furnace after mixing, after mixing O 2 The volume accounts for 30% of the volume...

Embodiment 2

[0025] Ignition and combustion step: use the circulating flue gas to transport pulverized coal to the furnace, and at the same time, separate the air to obtain O 2 sent into the furnace, ignited and burned;

[0026] Flue gas circulation steps: the high-temperature flue gas produced by the combustion of pulverized coal in the furnace is divided into two parts. The first part of high-temperature flue gas accounts for 30% of the total high-temperature flue gas volume. After cooling, dust removal and desulfurization, it is compressed into liquid CO 2 ;The second part of high-temperature flue gas accounts for 70% of the volume of all high-temperature flue gas, which is used as circulating flue gas;

[0027] The second part of high-temperature flue gas is further divided into two paths: the first path of high-temperature flue gas accounts for 80% of the volume of circulating flue gas. Income O 2 Enter the furnace after mixing, after mixing O 2 The volume accounts for 30% of the m...

Embodiment 3

[0029] Ignition and combustion step: use the circulating flue gas to transport pulverized coal to the furnace, and at the same time, separate the air to obtain O 2 sent into the furnace, ignited and burned;

[0030] Flue gas circulation steps: the high-temperature flue gas produced by the combustion of pulverized coal in the furnace is divided into two parts. The first part of high-temperature flue gas accounts for 60% of the total high-temperature flue gas volume. After cooling, dust removal and desulfurization, it is compressed into liquid CO 2 ;The second part of high-temperature flue gas accounts for 40% of the volume of all high-temperature flue gas, which is used as circulating flue gas;

[0031] The second part of high-temperature flue gas is further divided into two paths: the first path of high-temperature flue gas accounts for 60% of the volume of circulating flue gas. Income O 2 Enter the furnace after mixing, after mixing O 2 The volume accounts for 28% of the v...

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 provides a method for re-circulating combustion of flue gas of a pulverized coal fired boiler, belongs to a method for circulating combustion of oxygen gas (O2) and carbon dioxide (CO2) of pulverized coal, and aims to solve the problems of low heat efficiency and poor burn-out property existing in the conventional combustion method. The method comprises the steps of: 1,igniting and combusting: conveying the pulverized coal to a furnace hearth by using the circulation flue gas, and simultaneously conveying O2 to the furnace hearth for ignition; 2, circulating the flue gas: dividing the high-temperature flue gas generated by combustion into two parts, and performing cooling, dust removal and desulfurization compression on the first part to obtain liquid CO2; dividing the second part into two paths, conveying the first path to an entrance of the furnace hearth by using a high-temperature circulation fan, and mixing the first path of the flue gas and O2; and performing cooling, dust removal and desulfurization on the second path, and conveying the second path carrying the pulverized coal to the furnace hearth by using a cold circulation fan. The method has the advantages of adjusting the steam temperature of the boiler by using the high-temperature flue gas, enhancing convective heat transfer, increasing the steam temperature of the boiler, improving the heat efficiency of the boiler and the denitration rate, increasing the CO2 content after the high-temperature flue gas is cooled, reducing emission load of NOx, lowering CO2 capturing and collecting cost, and meeting the national energy conservation and environmental protection standard.

Description

technical field [0001] The invention belongs to pulverized coal O 2 and CO 2 Circulating combustion method, specifically relates to a pulverized coal boiler flue gas recirculation combustion method, used in the power industry CO 2 Emission reduction and removal of NOx and SOx, while improving the efficiency of pulverized coal boilers. Background technique [0002] Pulverized coal O 2 and CO 2 The cyclic combustion method is a new type of clean combustion technology that enriches CO2, reduces carbon emissions, and simultaneously removes coal-burning pollutants. It not only enables the separation and collection of CO 2 , can also reduce NOx emissions and facilitate the treatment of SO 2 ; Various CO in thermal power plants 2 Among the emission reduction control methods, large-scale emission reduction can be carried out, the technical economy is good, and the application potential is great, which has attracted the attention of international and domestic research, and the ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): F23B80/02F23C9/06F23C10/00F23L7/00F23L15/00F23G7/06C01B31/20F23D1/00C01B32/50
CPCY02E20/34Y02P20/10Y02P20/129
Inventor 邹春操时英郭鹏刘忠成刘晓东周旭凯徐龑
Owner HUAZHONG UNIV OF SCI & TECH
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