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Optimizing Method of Air Distribution Mode for W-type Flame Boiler

An optimization method and boiler technology, applied in the combustion method, combustion type, air supply adjustment and other directions, can solve the problems of poor stability and poor burnout of W flame boilers, and achieve the effect of improving stability and improving the adaptability of coal types.

Active Publication Date: 2020-01-07
中国大唐集团科学技术研究总院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a method for optimizing the air distribution mode of W-flame boilers that solves the technical problems of poor burnout performance and high-load stability of W-flame boilers and improves the burnout rate of pulverized coal.

Method used

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  • Optimizing Method of Air Distribution Mode for W-type Flame Boiler
  • Optimizing Method of Air Distribution Mode for W-type Flame Boiler
  • Optimizing Method of Air Distribution Mode for W-type Flame Boiler

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Embodiment 1

[0062] like image 3 As shown in the figure, the method for optimizing the air distribution mode of the W-type flame boiler in this embodiment is characterized in that, at about 1 / 3 of the furnace height, the front wall and the rear wall form a furnace arch inward, and 2×12 double cyclones are arranged on the arch. Burner; secondary air chambers are arranged on the front and rear walls of the lower furnace, which are divided into the secondary air chamber above the arch and the secondary air chamber under the arch through the partition. The partitions are separated to form independent secondary air chambers, and there are twelve independent air chambers on the front and rear walls; the dual cyclone burners correspond to the independent air chambers one by one, and the front wall is followed by the burner C1 and the burner from left to right. B1, burner C2, burner B2, burner C3, burner B3, burner C4, burner B4, burner C5, burner B5, burner C6, burner B6; the rear wall from left...

Embodiment 2

[0071] The method for optimizing the air distribution mode of the W-type flame boiler in this embodiment, on the basis of Embodiment 1, also includes SOFA nozzles on the arch, four on each of the front and rear walls, three of which are hedged, the right side of the front wall and the left side of the rear wall. Arranged in a manner of setting a spout respectively.

[0072] Due to the serious over-temperature phenomenon in the boiler reheater, the over-temperature problem of the reheater is solved by shutting down the burner in the over-temperature area during normal operation.

[0073] It is believed that the energy in the middle position of the boiler is relatively concentrated, and this symptom can be alleviated by adjusting the downward tilt angle of the F wind and the air distribution of the F wind.

[0074] The downward inclination angle of the F wind and the opening degrees of the D and E winds adopt the formula described in the following table. This operation method ha...

Embodiment 3

[0077] In this embodiment, the air distribution method of the W-type flame boiler is optimized. The W-type boiler uses a staged combustion method to burn coal types, which specifically includes: selecting a predetermined proportion of flammable coal types and anthracite coal, and using flammable coal types to react with oxygen , become the first-stage combustion; the high-temperature flue gas atmosphere formed in the first stage ignites the anthracite under the high-temperature flue gas, forming the second-stage combustion, in which the volatile content of the flammable coal is higher than that of the anthracite, and the volatile The ratio of bituminous coal to anthracite is greater than 1:1. Preferably, the ratio of bituminous coal to anthracite is 3:1.

[0078] In this embodiment, the W-type flame boiler is equipped with four coal mills, the first coal mill and the third coal mill are used for grinding anthracite coal, and the second coal mill and the fourth coal mill are us...

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Abstract

The invention relates to a W-shaped flame boiler air distribution way optimization method. The method comprises steps of analyzing an acquired boiler operation condition, determining an F wind downward inclination angle and D,E wind opening degree, in which for a back wall, the F wind downward inclination angle is 25,25,5,5,30,30,30,30,5,5,25,25, the E wind opening degree is 25,25,5,20,20,20,20,20,5,5,10,10, the D wind opening degree is 5,5,5,5,5,5,5,5,5,5,5,5 and for a front wall, the F wind downward inclination angle is 25,25,5,5,30,30,30,30,5,5,25,25, the E wind opening degree is 25,25,5,20,20,20,20,20,5,5,10,10 and the D wind opening degree is 5,5,5,5,5,5,5,5,5,5,5,5. An in-furnace combustion work condition can be improved; and CO can be reduced and flying ash carbon content can be also reduced at the same time.

Description

technical field [0001] The invention relates to a method for optimizing the air distribution mode of a W-shaped flame boiler. Background technique [0002] At present, W-type flame boilers are exposed to some problems, among which poor combustion stability is one of the important problems. During operation, when the oxygen content is high (O2>2%) in high-load operation, the fire detection signal begins to flash, and the combustion situation deteriorates, so that the unit must operate with low oxygen during high-load operation, resulting in carbon dioxide and fly ash containing carbon. The amount is too high, and the boiler efficiency is low. The reasons for the poor combustion stability mainly include two points: First, when the boiler is under high load, the speed of the primary air jet is high, the ignition point moves down, the flame and the secondary air are mixed earlier, and the flame becomes unstable, resulting in an increase in the negative pressure fluctuation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23L9/00F23C5/08F23K1/00F23C7/00F23N3/00F23M5/08
CPCF23C5/08F23C7/00F23C2201/30F23K1/00F23K2201/10F23L9/00F23M5/08F23N3/00F23N2239/02Y02E20/34
Inventor 刘彦鹏张志刚张新陈坤洋
Owner 中国大唐集团科学技术研究总院有限公司
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