Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Exhaust gas and hot-blast air dual-medium powder feeding system

A technology for hot air and powder feeding, applied in the field of coal-fired boilers, can solve problems such as poor mixing effect of spent gas and hot air, explosion accidents, etc., and achieve the effects of preventing slagging, tempering and burning, small transformation workload, and convenient adjustment.

Active Publication Date: 2012-01-25
HARBIN INST OF TECH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of poor mixing effect of exhaust gas and hot air in the exhaust air hot air mixer in the existing exhaust air and hot air dual-medium powder feeding system, the present invention adopts a structure in which multiple exhaust air nozzles are concentrated in one air distribution main pipe. Moreover, the pulverized coal carried in the exhaust gas is concentrated and deposited in the air distribution main pipe, which is very easy to form a large resistance that will cause an explosion accident, and then proposes a mixer with only one exhaust gas nozzle and a hot air pipe The exhaust gas and hot air dual medium powder feeding system

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
  • Exhaust gas and hot-blast air dual-medium powder feeding system
  • Exhaust gas and hot-blast air dual-medium powder feeding system
  • Exhaust gas and hot-blast air dual-medium powder feeding system

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0017] Specific implementation mode one: see Figure 2-5 , The exhaust gas and hot air dual-medium powder feeding system described in this embodiment includes a powder discharger 21, a tertiary air pipeline 26, a tertiary air pipeline control valve 32, an air powder mixer 18, a exhaust air bellows 20, a hot air pipeline 28, a primary Air pipeline 29, primary air pipeline control valve 31 and primary air powder delivery pipeline 30, described powder delivery system also includes exhaust pipeline fast shut-off valve 25, exhaust pipeline 27 and exhaust gas hot-air mixer 33, described tertiary air The inlet end of the pipeline 26, the inlet end of the exhaust gas pipeline 27 are all connected with the output end of the powder discharger 21, the outlet end of the tertiary air pipeline 26 is connected with the tertiary air nozzle 24 on the boiler 1, and the tertiary air pipeline 26 is provided with exhaust Air wind box 20; the outlet end of the hot blast pipeline 28 communicates wit...

specific Embodiment approach 2

[0019] Specific implementation mode two: see Figure 3-5 , the exhaust air hot air mixer 33 in this embodiment is composed of an exhaust air nozzle 33-1, a hot air pipe 33-2, a mixing pipe 33-3 and a closed hot air receiving chamber 33-4, and the exhaust air nozzle 33-1 One end of the mixing tube 33-3 is inserted into the airtight hot blast receiving chamber 33-4, the mixing tube 33-3 is coaxially arranged opposite to the exhaust nozzle 33-1 and one end of the mixing tube 33-3 communicates with the airtight hot blast receiving room 33-4, and the hot blast tube One end of 33-2 communicates with the airtight hot air receiving chamber 33-4. The other end of the exhaust air nozzle 33-1 communicates with the exhaust air pipeline 27, and the other end of the mixing tube 33-3 and the other end of the hot air pipe 33-2 communicate with the primary air pipeline 29. The design of the exhaust air hot blast mixer 33 adopts the ejector principle. The exhaust air ejected from the exhaust ...

Embodiment 1

[0021] Example 1: The boiler has two layers of primary air burners and is equipped with two sets of pulverizing systems. Each system includes raw coal bunkers, coal feeders, coal mills, coarse powder separators, fine powder separators, powder exhausters and various pipelines. Both sets of milling systems are in normal operation. combined with figure 2This embodiment will be described. The dual-medium powder feeding system of exhaust air and hot air includes a control valve 25 , an exhaust air pipeline 27 , a hot air pipeline 28 , a primary air pipeline 29 , and a primary air powder supply pipeline 30 . Close the original tertiary air control valve, open the control valve of the exhaust air pipeline, supply the exhaust air at the outlet of the powder discharger into the primary air pipeline, and adjust the hot air control valve of the primary air pipeline according to the primary wind speed to achieve the mixture of exhaust air and hot air The purpose of sharing fans. The ...

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

A mixer is only provided with an exhaust gas and hot-blast air dual-medium powder feeding system having an exhaust gas tube and a hot-blast tube. The invention relates to a powder feeding system and belongs to the technical field of coal-fired boilers. The powder feeding system solves the problems of bad mixing effect of the exhaust gas and hot-blast air and so on in the exhaust gas and hot-blast air dual-medium powder feeding system because the exhaust gas and hot-blast air mixer adopts a structure form that a plurality of exhaust gas nozzles are centralized in one air distribution main pipe. The powder feeding system includes a wind powder mixer, an exhaust gas bellows, a hot-blast pipeline, a primary air pipeline, a primary air powder feeding pipeline, an exhaust gas pipeline and an exhaust gas and hot-blast mixer. The exhaust gas and hot-blast mixer is composed of the exhaust gas nozzle, the hot-blast tube, a mixing tube and a closed hot-blast receiving chamber. One end of the exhaust nozzle is inserted in the closed hot-blast receiving chamber. The mixing tube and the exhaust nozzle are coaxially and oppositely arranged and one end of the mixing tube is communicated with the closed hot-blast receiving chamber. One end of the hot-blast tube is communicated with the closed hot-blast receiving chamber. The invention is mainly applicable for powder feeding of pulverized coal boiler for power plants.

Description

technical field [0001] The invention relates to a powder feeding system, in particular to a dual-medium powder feeding system of exhaust gas and hot air, which belongs to the technical field of coal-fired boilers. Background technique [0002] Some existing pulverized coal boilers in power plants in my country widely use intermediate pulverized coal bunkers and hot air powder feeding systems when burning bituminous coal, lean coal and anthracite (see figure 1 ), in these boilers, the exhaust gas is used as the tertiary air, which is usually arranged on the uppermost layer of the burner, and the primary and secondary air nozzles are arranged below it. The air volume of the tertiary air is about 15-20% of the total air volume, which contains 10-15% coal powder. [0003] The use of tertiary air has an impact on the NOx emission level at the boiler tail. When the tertiary air is sprayed into the furnace, the excess combustion air coefficient in the nozzle area is high, often a...

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 Patents(China)
IPC IPC(8): F23K3/02
Inventor 孙锐孙绍增赵义军王正阳秦香彬廖坚
Owner HARBIN INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com