Symmetrical-combustion W-Type flame boiler

A flame and boiler technology, which is applied in the combustion field of W-shaped flame boilers, can solve the problems of cracking of water wall fins, large temperature deviation of water wall walls, high content of combustibles in boiler fly ash, etc., and achieve the effect of solving the deflection of flow field

Active Publication Date: 2015-01-21
NINGBO UNIV
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Combustion asymmetry is more harmful to the economical and safe operation of W-type flame boilers. In severe cases, the combustion stability in the furnace is poor, and the negative pressure in the furnace fluctuates greatly, resulting in frequent fire extinguishing accidents; In addition, for supercritical W-type flame boilers, combustion asymmetry also causes uneven heat load distribution in the furnace, resulting in relatively large temperature deviations in water-cooled walls. Large and wall temperature exceeding the allowable value, excessive deviation of water wall temperature and wall temperature seriously exceeding the allowable value will lead to cracking of water wall fins or even pipe burst accidents

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
  • Symmetrical-combustion W-Type flame boiler
  • Symmetrical-combustion W-Type flame boiler
  • Symmetrical-combustion W-Type flame boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] combine figure 1 with figure 2To illustrate this embodiment, the furnace of a W-shaped flame boiler with symmetrical combustion described in this embodiment is divided into two parts, the lower furnace 7 and the upper furnace 8. The lower furnace 7 consists of a front arch 1, a rear arch 2, a front wall 4, The rear wall 5 and the cold ash bucket 6 are composed; multiple burners 3 are symmetrically arranged on the front arch 1 and the rear arch 2 along the center line 1-1 of the furnace, and communicate with the lower furnace 7 to supply the air-powder mixture injected downward. 12; The graded air 13 is fed symmetrically from the lower part of the front wall 4 and the rear wall 5 to organize graded combustion and adjust the undershoot depth of the flame; The connecting wall 1a under the front arch and the connecting wall 2a under the rear arch symmetrically arranged on the line 1-1, the connecting wall 1a under the front arch and the connecting wall 2a under the rear ...

Embodiment approach 2

[0022] combine figure 2 To illustrate this embodiment, the W-shaped flame boiler in this embodiment has a row of return flue gas ports 11a evenly arranged along the width direction of the furnace in the upper area of ​​the connecting wall 1a under the front arch and the connecting wall 2a under the rear arch. A return flue gas port 11a corresponds to a plurality of burners 3 in the arch along the furnace width direction, so as to allow the return flue gas 11 to pass through and heat the air powder mixture 12 in the burner area under the arch; -1 to the distance from the centerline 2-3 of the return flue gas port 11a l 2 should meet l 2 / l 1 =0.25~0.35, the width of the return flue gas port 11a a Equivalent diameter of nozzle with burner 3 d Satisfy a / d ≈2, the aspect ratio of the return flue gas port 11a b / a =1.5~2. Other components and connections are the same as those in the first embodiment.

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 symmetrical-combustion W-Type flame boiler. Connecting wallsunder arches arearranged at the junction of an upper hearth and a lower hearth, extend downwards and vertically so as to approach a cold ash bucket area, and extend to left and right walls of the boiler in the width direction of the boiler so as to form a semi-closed area under a front arch and a rear arch. Limited in the semi-closed area, the gas-powder mixtures of burners are expanded to move down to finally arrive the middle upper area of the cold ash bucket and then are turned to move upward, thereby ensuring that two symmetrical U-type flames are formed at the front and rear walls and meet at the centers of the hearths to form a symmetrical W-type flame. A row of backflow flue gas ports are formed in the upper part of the connecting wall under the arch and are in one-to-one correspondence with the burners at the arches along the width direction of the boiler, so that the gas-powder mixtures in the areas of the burners are conveniently heated by high-temperature backflow flue gas under the arches; the height size of the connecting wall under the arch meets the expression of l1 / l0=0.6-0.7; the positioning in the height direction of the backflow flue gas ports meets the expression of l2 / l1=0.25-0.35; the width of the backflow flue gas ports is approximately twice of the equivalent diameter of burner nozzles, and the height / width ratio is 1.5-2.

Description

technical field [0001] The invention relates to a W-shaped flame boiler, in particular to a W-shaped flame boiler capable of ensuring symmetrical combustion in a furnace, and belongs to the technical field of W-shaped flame boiler combustion. Background technique [0002] W-type flame boiler is a kind of boiler specially designed for burning low volatile fuels (such as anthracite, lean coal and petroleum coke) in developed industrial powerhouses in Europe and America in the 1950s and 1960s. From the perspective of its furnace structure and combustion organization, the W-shaped flame boiler has the following advantages in burning low-volatile coal: (a) the unique double-arch furnace structure strengthens the radiation of the high temperature of the arch wall to the burner area; (b) ) A large number of sanitary combustion belts are laid on the water-cooled walls around the burner area to maintain the high temperature level of the fire area; (c) Construct a W-shaped flame combu...

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): F23C3/00
Inventor 况敏凌忠钱曾宪阳
Owner NINGBO UNIV
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