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Concentration and swirl vane adjustable pulverized coal burner

A technology of pulverized coal burner and swirling blade, which is applied in the direction of burner, burner for burning powder fuel, combustion method, etc., and can solve the problems of affecting the combustion effect of pulverized coal, broken multi-stage concentration rings, troublesome adjustments, etc.

Active Publication Date: 2020-10-27
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, after the concentration of pulverized coal in the above two methods is concentrated, the concentration and velocity will increase, which will cause a large erosion of the multi-stage concentration ring and cause the multi-stage concentration ring to break prematurely; at the same time, the increase in the velocity of the primary air pulverized coal will also cause the furnace Destruction of inner recirculation zone is not conducive to nitrogen reduction
On the other hand, the swirling state of the cyclone in the above two methods cannot be adjusted, or the adjustment is cumbersome and cumbersome, thus affecting the combustion effect of pulverized coal

Method used

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  • Concentration and swirl vane adjustable pulverized coal burner
  • Concentration and swirl vane adjustable pulverized coal burner
  • Concentration and swirl vane adjustable pulverized coal burner

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Experimental program
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Effect test

specific Embodiment 1

[0035] like figure 1 As shown, the present invention includes an outer primary air channel 3, an inner secondary air channel 7, and an outer secondary air channel 6 arranged coaxially from the inside to the outside, and the outlet end of the inner secondary air channel 7 is provided with an inner secondary air channel. The nozzle 9 is provided with an outer secondary air nozzle 8 at the outlet end of the outer secondary air passage 6, and the inner secondary air nozzle 9 and the outer secondary air nozzle 8 are conical flared, and the inner secondary air nozzle 9 and the inner diameter of the outer secondary air nozzle 8 gradually increases along the pulverized coal flow direction Q. For the convenience of description, the inner secondary air channel 7 and the outer secondary air channel 6 are collectively referred to as the secondary air channel. In the secondary air channel A swirler 5 is provided, and an inner primary air channel 4 is coaxially arranged in the outer primary...

specific Embodiment 2

[0042] like image 3 As shown, the difference from the specific embodiment 1 is that the outlet end 11 of the inner primary air passage is a bell mouth 16 of an alternately curved inner concave and outer convex shape, that is, the cross section of the bell mouth 16 also has alternately arranged inner concave outer convex. Convex edge 12, and the groove depth of the inner concave and outer convex edge 12 gradually increases along the pulverized coal flow direction Q; at the same time, a straight cylinder 15 is coaxially installed in the bell mouth 16, and the straight cylinder 15 is fixed on the bell mouth by a connecting rod 14 16 and there is a gap between the rear end of the straight tube 15 and the inner wall of the bell mouth 16, and the front end of the straight tube 15 is aligned with the front end 13 of the outer primary air passage.

[0043] Through the cooperation of the bell mouth 16 and the straight cylinder 15, the pulverized coal concentration in the straight cyli...

specific Embodiment 3

[0046] like Figure 4 As shown, between the rear end inner corner of each guide vane 510 and the inner swivel ring 57, between the rear end outer corner of each guide vane 510 and the outer swivel ring 56, all are connected by extension spring 58, each guide vane 510 The inner corner of the front end and the inner wall of the secondary air channel 59 are connected by a spherical universal joint 512, thereby ensuring a more smooth and stable change of the inclination angle and the torsion angle of each guide vane 510.

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Abstract

The invention belongs to the technical field of boiler combustion and discloses a concentration and swirl vane adjustable pulverized coal burner. The concentration and swirl vane adjustable pulverizedcoal burner comprises an outer primary air channel, an inner secondary air channel and an outer secondary air channel that are arranged coaxially in sequence from inside to outside; the outlet end ofthe inner secondary air channel is provided with a secondary air nozzle; the outlet of the outer secondary air channel is provided with an outer secondary air nozzle; the inner secondary air nozzle and the outer secondary air nozzle are both a conical expanded-opening type; the inner diameter of the inner secondary air nozzle and the outer secondary air nozzle is gradually increased along the airflow direction Q of pulverized coal; the inner secondary air channel and the outer secondary air channel are called by a joint name of secondary air channel; the secondary air channel is internally provided with whirlcone; the outer primary air channel is coaxially internally provided with an inner primary air channel; the outlet end of the inner primary air channel is located at the inner side of the outlet end of the outer primary air channel; the outlet end of the inner primary air channel is an inside-concave and outside-convex alternative bent end opening; and thus the pulverized coal burner realizes adjustment of dense pulverized coal and dilute pulverized coal separation by central air and the swirl vanes of the whirlcone.

Description

technical field [0001] The invention belongs to the technical field of boiler combustion, in particular to a pulverized coal burner with adjustable density and swirl blades. Background technique [0002] Coal-fired power plants generate large amounts of nitrogen oxides (NO) during the combustion of fuel X , which mainly contain NO (nitric oxide), NO 2 (nitrogen dioxide) and a small amount of N 2 O (nitrogen monoxide) and other gases, during the combustion process in the furnace, through the understanding of nitrogen oxides NO X The formation mechanism of the flue gas can be determined according to the way of combustion, the temperature in the furnace during the combustion process, the value of the excess air coefficient, and the length of residence time of the flue gas in the furnace. Thus, nitrogen oxides NO X thermal nitrogen oxides NO X , fuel nitrogen oxides NO X and rapid nitrogen oxides NO X Three categories. [0003] At present, the low nitrogen oxide NO x Th...

Claims

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Application Information

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IPC IPC(8): F23D1/02F23L1/00F23L9/00
CPCF23D1/02F23L1/00F23L9/00Y02E20/34
Inventor 遆曙光王浩鹏王宏聂雪丽刘燕南高柯况敏李正行
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY