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W-flame boiler with extended-range secondary air nozzles

A secondary air and nozzle technology, applied in the combustion field of W-shaped flame boilers, can solve the problems of short primary air pulverized coal flow and low boiler burnout rate, and achieve high fly ash combustible content, short residence time, delay The effect of momentum decay

Active Publication Date: 2011-01-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the W-type flame boiler device mentioned in the background technology has a short stroke of the primary air pulverized coal flow and a low burnout rate of the boiler during operation, and then provides a secondary air nozzle with an extended range. W type flame boiler

Method used

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  • W-flame boiler with extended-range secondary air nozzles
  • W-flame boiler with extended-range secondary air nozzles
  • W-flame boiler with extended-range secondary air nozzles

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specific Embodiment approach 1

[0007] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment, a W-shaped flame boiler with an extended-range secondary air nozzle described in this embodiment includes a furnace body composed of a lower furnace body 1, an upper furnace body 2 and two furnace arches 3, and a plurality of A primary air nozzle 10, a plurality of exhaust gas nozzles 12 and a plurality of secondary air nozzles 13; the W-shaped flame boiler also includes a plurality of range-extending secondary air nozzles 11; a plurality of primary air nozzles 10 are divided into two groups, and each A group of primary air nozzles 10 are arranged in parallel along the length direction of the furnace arch on the side close to the hearth center line 2-1 on each furnace arch 3; multiple secondary air nozzles 13 are divided into two groups, and on each furnace arch 3, they are located far away from the furnace. A group of secondary air nozzles 13 are arranged in parallel along the ...

specific Embodiment approach 2

[0010] Specific implementation mode two: combination figure 1 Describe this embodiment, the W-shaped flame boiler described in this embodiment also includes a plurality of tertiary air nozzles 14, the plurality of tertiary air nozzles 14 are divided into two groups, the front wall water cooling wall 4 of the lower furnace body 1, and the rear wall water cooling wall 4-1 is respectively provided with a group of tertiary air nozzles 14 along its length direction. A plurality of tertiary air nozzles 14 are arranged on the bottom of the front wall water cooling wall 4 and the rear wall water cooling wall 4-1. The wind that enters the furnace through the tertiary air spout 14 is the tertiary air 9 . The purpose of setting the tertiary air nozzle 14 is to further improve the burnout rate. Other components and connections are the same as those in the first embodiment.

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Abstract

The invention relates to a W-flame boiler, in particular to a W-flame boiler with extended-range secondary air nozzles. The invention aims at solving the problems that the W-flame boiler provided in the background art has short pulverized-coal airflow stroke of primary air during the running and low burnout ratio of the boiler. A group of primary air nozzles, a group of exhaust gas nozzles and a group of secondary air nozzles are arranged on each furnace arch along the length direction in parallel; each group of the primary air nozzles comprises a plurality of primary air nozzle subgroups arranged at equal intervals, and an extended-range secondary air nozzle is arranged on the furnace arch between every two adjacent primary air nozzle subgroups; the extended-range secondary air is a gustof secondary air separated from the secondary air entering a hearth from the secondary air nozzles; and the extended-range secondary air is sprayed into the furnace from the extended-range secondary air nozzles at the air speed of 35-40 m / s and continues to penetrate into the hearth by being carried with the primary air with low speed (approximately being 10m / s). After the arrangement method of the W-flame boiler with extended-range secondary air nozzles is adopted, the content of the combustibles in fly ash is reduced to 5.8 percent, and the economical efficiency of running of the boiler is improved.

Description

technical field [0001] The invention relates to a W-shaped flame boiler, in particular to a W-shaped flame boiler with an extended-range secondary air nozzle, and belongs to the technical field of W-shaped flame boiler combustion. Background technique [0002] W-type flame combustion boiler is a boiler specially designed for burning anthracite and lean coal. Judging from the existing operating performance, W-type flame boilers generally have problems such as poor combustion stability, serious slagging in the lower furnace, and low burnout. There have been some studies on the above problems in China, such as the Chinese invention patent application "A W-type flame boiler device with stable combustion and anti-slagging gap" (disclosure date is February 18, 2009, patent number is 200810137213.3, application date is 2008 September 27, 2009) (hereinafter referred to as "patent applied for") proposed to move the primary air nozzle 10' and the exhaust gas nozzle 12' on the front a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C7/00F23L9/00
Inventor 李争起陈智超况敏朱群益徐善田张佳杨连杰吴远刚刑超
Owner HARBIN INST OF TECH