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W flame boiler with swirl pulverized coal burner primary and secondary air eccentrically arranged

A technology of pulverized coal burner and secondary air, which is applied to the combustion of block fuel and powder fuel, the combustion of liquid fuel and powder fuel, the combustion of gaseous fuel and powder fuel, etc., which can solve the problem of heat transfer Increased resistance, increased exhaust heat loss, increased boiler exhaust temperature, etc., to achieve the effect of poor flame stability and improved flame stability

Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slagging of the water wall of the boiler will increase the heat transfer resistance, weaken the heat transfer, reduce the heat absorption of the working medium, increase the temperature of the boiler exhaust gas, increase the heat loss of the exhaust gas, and reduce the efficiency of the boiler, which will cause uneven heating of various parts of the water wall , resulting in damage to the water-cooled wall; high-temperature corrosion of the boiler water-cooled wall makes the water-cooled wall thinner, forming a serious hidden danger for safe operation, increasing the workload of temporary maintenance and overhaul of the boiler, and causing great economic waste; high-temperature corrosion of the boiler water-cooled wall is prone to occur Sudden explosion accident of water-cooled wall tubes, resulting in emergency shutdown for maintenance and additional maintenance costs, directly affecting the efficiency of the power plant

Method used

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  • W flame boiler with swirl pulverized coal burner primary and secondary air eccentrically arranged
  • W flame boiler with swirl pulverized coal burner primary and secondary air eccentrically arranged

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specific Embodiment approach 1

[0016] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment, the W-flame boiler with the eccentric arrangement of the first and secondary air of the swirl pulverized coal burner in this embodiment includes a furnace body 5, a plurality of swirl pulverized coal burners 3, a plurality of exhaust gas nozzles 10 and a plurality of A grading air spout 11, the body of furnace 5 is composed of a lower furnace 1 and an upper furnace 2, and a plurality of swirl pulverized coal burners 3 are evenly arranged on the front furnace arch 9 and the rear furnace arch 4 of the upper furnace 2, each swirl The inner secondary air pipe 7 and the outer secondary air pipe 8 of the flowing pulverized coal burner 3 are arranged offsetly with respect to the primary air pipe 6 in a direction away from the centerline 2-1 of the furnace.

specific Embodiment approach 2

[0017] Specific implementation mode two: combination figure 1 and figure 2 Describe this embodiment, the primary air passage axis 14 of the primary air duct 6 of the W flame boiler of the swirl pulverized coal burner described in this embodiment and the secondary air eccentrically arranged, the inner secondary air of the inner secondary air duct 7 The channel axis 13 and the outer secondary air channel axis 12 of the outer secondary air pipe 8 are parallel to each other and located in the first plane 16 . Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0018] Specific implementation mode three: combination figure 1 and figure 2 Describe this embodiment, the first plane 16 of the W flame boiler with the eccentric arrangement of the swirl pulverized coal burner described in this embodiment and the secondary air is perpendicular to the water-cooled wall 2-2 of the front wall of the furnace and the water-cooled wall 2-2 of the rear wall of the furnace 3. Other components and connections are the same as those in the second embodiment.

[0019] Specific implementation mode three: combination figure 1 and figure 2 Describe this embodiment, the primary air channel nozzle end surface circle center O of the primary air duct 6 of the primary air duct 6 of the W flame boiler with the primary and secondary air eccentric arrangement of the swirl pulverized coal burner described in this embodiment 1 The nozzle end face of the inner secondary air channel of the inner secondary air duct 7 is on the radius of the first plane 16 close to...

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Abstract

The invention belongs to the technical field of low-nitric oxide combustion of W-flame boilers, and relates to a W-flame boiler, in particular to a W-flame boiler with rotational flow pulverized coal burners with primary air and secondary air eccentrically arranged to solve the problems that a W-flame boiler with rotational flow pulverized coal burners arranged on an arch is large in NOx discharge and high in fly ash combustible matter content, scorification occurs on a front wall water wall and a rear wall water wall of a lower hearth, and high-temperature abrasion happens. The W-flame boiler comprises a boiler body, the multiple rotational flow pulverized coal burners, a plurality of exhausting steam nozzles and a plurality of classification wind nozzles. The boiler body is composed of a lower hearth and an upper hearth. The multiple rotational flow pulverized coal burners are evenly distributed on a front arch and a rear arch of the upper hearth. An inner secondary air pipe and an outer secondary air pipe in each rotational flow pulverized coal burner are arranged in the direction far away from the center line of the hearths in an offset manner relative to primary air pipes.

Description

technical field [0001] The invention relates to a W-flame boiler, in particular to a W-flame boiler in which the primary and secondary air of a swirl pulverized coal burner are arranged eccentrically, and belongs to the technical field of W-flame boiler low-nitrogen oxide combustion. Background technique [0002] At present, some domestic power plant boilers are W-flame boilers with swirl pulverized coal burners arranged on the arch. W Flame Boiler is a boiler designed for burning anthracite and lean coal. During the operation of this kind of boiler, there are common problems such as high NOx emission, high content of fly ash combustibles, high-temperature corrosion and slagging of the water-cooled walls of the front and rear walls of the lower furnace. [0003] W flame boiler NOx emission is high, up to 1500-1800mg / m 3 . NOx is toxic to animals and humans, is one of the main substances that form acid rain, is also an important substance that forms photochemical smog in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C5/08F23C7/00
CPCF23C5/08F23C7/00F23C2900/06041
Inventor 陈智超王青祥曾令艳李争起车苗苗李晓光宋民航乔成成
Owner HARBIN INST OF TECH
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