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Plasma oil-free ignition staged combustor

An oil-free ignition, staged combustion technology, applied in burners, powder fuel burners, combustion methods, etc., can solve problems such as poor adaptability of different coal types, achieve enhanced ignition and stable combustion effects, clear concept, design reasonable effect

Active Publication Date: 2014-04-09
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ignited pulverized coal airflow and the unignited pulverized coal airflow can only be mixed at the outlet of the cylinder, and the length and radius of the cylinder can only be determined through experiments and experiences, resulting in poor adaptability to different coal types

Method used

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  • Plasma oil-free ignition staged combustor
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  • Plasma oil-free ignition staged combustor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] refer to figure 1 , figure 2 , image 3 with Figure 4 , a plasma oil-free ignition staged burner of the present invention, including a plasma generator 1 and a burner 2. Two sets of guide vane sets 3 are arranged in the burner 2, the guide vane sets 3 include four guide vanes 5, there are gaps between the guide vanes 5, the guide vanes are arc-shaped, the radius of curvature is the same as the radius of curvature of the burner nozzle Similarly, the center of arc of the guide vane 5 is inside the burner, and the guide vane 5 is connected with a movable guide rod 4 . The guide vane set 3 and the combustor 2 are coaxially arranged. Such as figure 2 As shown, the movable guide rod 4 radially penetrates into the burner 2, and can drive the radial movement of the guide vane 5, and the radial movement is a linear reciprocating movement.

[0028] Before ignition, such as image 3 As shown, the guide vanes 5 are retracted and attached to the inner wall of the burner. ...

Embodiment 2

[0032] refer to figure 1 , Figure 4 , Figure 5 with Image 6 , the difference between this embodiment and Embodiment 1 is that in this embodiment, the guide vane group 3 includes 6 pulverized coal air flow guide vanes 5, the radius of curvature of the guide vanes 5 is the same as that of the burner nozzle, and the guide vanes 5 arc The center of the surface is inside the burner, and each pulverized coal flow guide vane 5 is inserted into the burner 2 in a circular arc reciprocating motion with a certain center point 6 as the center of the circle (the center point 6 is the rotation center of the blade 5). The vane group 3 can divide the pulverized coal flow into two parts (or approximately into two parts). The plasma generator 1 is axially inserted into the space surrounded by the guide vane set 3, ignites the pulverized coal flow entering the space, and forms a new, stable ignition source with higher thermal power at the outlet of the guide vane set 3 end , using this ig...

Embodiment 3

[0036] refer to Figure 7 , Figure 8 with Figure 9 , the difference between this embodiment and Embodiment 1 is that in this embodiment, the guide vane group 3 includes 5 pulverized coal flow guide vanes 5, the radius of curvature of the guide vanes 5 is the same as that of the burner nozzle, and the guide vanes 5 arc The center of the circle of the surface is outside the burner, the movable guide rod 4 pushes the guide vane group 3 into the burner axially from the burner, and the guide vane group 3 can also be axially withdrawn from the burner through the movable guide rod 4, that is, the guide vane 3 from axial ( Figure 9 Insert or withdraw the burner in the vertical direction of the paper. The vane group 3 can divide the pulverized coal flow into two parts (or approximately into two parts). The plasma generator 1 is axially inserted into the space surrounded by the blade group 3, ignites the pulverized coal flow entering the space, and forms a new, stable, and higher...

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Abstract

The invention discloses a plasma oil-free ignition staged combustor, which comprises a plasma generator and a combustor, wherein a pulverized coal airflow guide vane group is arranged in the combustor; the guide vane group comprises at least two guide vanes which are annularly arranged by taking a centre line of the combustor as an axis; and a gap is formed between the guide vanes. According to the technical scheme, the pulverized coal airflow guide vane group is arranged inside the combustor, and primary air pulverized coal airflow can be staged through the guide vane group; and because the gap is formed between the vanes in the guide vane group, the pulverized coal airflow can flow through the gap between the vanes, the mixing of ignited pulverized coal and unignited pulverized coal inside the combustor is enhanced, and the backflow and entrainment of high-temperature flue gas are strengthened, so that more pulverized coal is heated, the ignition success rate is improved, and a stable combustion effect is achieved.

Description

technical field [0001] The invention belongs to the field of thermal boilers, and relates to a boiler combustion system, in particular to a plasma oil-free ignition staged burner. Background technique [0002] The traditional way of igniting boilers in power plants is oil gun ignition. When the boiler is ignited, the fuel gun is first lit. After the oil burns in the furnace for a certain period of time, the furnace is heated to the ignition temperature of the pulverized coal flow. At this time, the pulverized coal is blown into the furnace for mixed combustion of oil and coal. When the load of the boiler reaches more than 50% and the pulverized coal flow can burn stably, the fuel oil is gradually cut off to complete the ignition and start-up process of the boiler. In order to save costs and reduce the fuel oil consumption of power plant boilers, many companies at home and abroad have developed a variety of plasma oil-free ignition burners, and have been widely used in many ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23D1/00
Inventor 郑路
Owner SHANGHAI BOILER WORKS
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