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Soot blowing device used for circular flue of coal-fired power plant

A technology of soot blowing device and coal-fired power plant, which is applied in the direction of combustion method, treatment of combustion products, removal of solid residue, etc., can solve problems such as easy ash accumulation in circular flue, and solve the problem of ash accumulation in the flue, The effect of soot blowing is obvious and the structure is simple

Inactive Publication Date: 2016-02-03
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method of adding a soot blowing device to solve the problem that the circular flue of the current coal-fired power plant is prone to ash accumulation on the inclined section mentioned in the prior art.

Method used

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  • Soot blowing device used for circular flue of coal-fired power plant
  • Soot blowing device used for circular flue of coal-fired power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A soot blowing device for a circular flue of a coal-fired power plant, comprising a plurality of nozzles arranged on an inclined surface inside the circular flue, the angle between the spray direction of the nozzle output end and the inclined surface is 0-5°, The height of the nozzle is 0.02~0.1 times the diameter of the circular flue, the diameter of the nozzle is greater than or equal to 0.01 times the diameter of the circular flue, and the distance between adjacent nozzles is less than or equal to 0.9 times the diameter of the circular flue.

Embodiment 2

[0021] This embodiment is improved on the basis of Embodiment 1. The soot blowing device for the circular flue of a coal-fired power plant also includes a regulating valve and a booster pump. One end of the regulating valve is connected to the input end of the nozzle. The other end of the regulating valve is connected with the booster pump.

[0022] The air volume drawn by the induced draft fan passes through the booster pump, passes through the regulating valve and then enters the nozzle. A regulating valve controls the speed at which the nozzle blows out. The frequency of use is once a day below 50% of the equivalent continuous operation rating, and the blowing sequence is from upstream to downstream. In order to keep the nozzle clean, a small amount of air volume should be maintained. At the same time, it should run continuously before the nozzle is shut down.

[0023] Parameters such as nozzle shape, installation height, installation angle and spray speed depend on the ...

Embodiment 3

[0026] The verification test is carried out on the inclined flue model, and the main parameters of the model are as follows:

[0027] Flue diameter Nozzle diameter nozzle height nozzle angle blowing speed Nozzle spacing Soot accumulation height D=800mm d=10mm h=50mm 5° 50m / s L=70mm H=15mm

[0028] The test verifies that the accumulated ash within 800mm can be completely removed within 3 minutes. Add the amount of accumulation accumulated over time to convert the actual flue, and the accumulated soot can be removed in about 40 minutes. The test demonstrates that the soot blowing system is easy to install and the soot blowing effect is obvious.

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Abstract

The invention discloses a soot blowing device used for a circular flue of a coal-fired power plant. The soot blowing device comprises a plurality of nozzles arranged on the inclined surface inside the circular flue; the included angle between the spraying direction of the output end of each nozzle and the inclined surface is 0-5 degrees; the height of the nozzles is 0.02-0.1 time the diameter of the circular flue; the diameter of the nozzles is greater than or equal to 0.01 time that of the circular flue; the distance between the adjacent nozzles is smaller than or equal to 0.9 time the diameter of the circular flue. The soot blowing device is designed for the circular flue of the coal-fired power plant, and is simple in structure, low in energy consumption, low in economic cost, and remarkable in soot blowing effect through experimental verification, and the problem of accumulated soot in the flue can be effectively solved.

Description

technical field [0001] The invention relates to a flue device for a power plant, in particular to a soot blowing device for a circular flue in a coal-fired power plant. Background technique [0002] The circular flue is more popular in developed countries such as Japan because of its uniform force, simple reinforcement ribs and internal support, less consumables, and avoiding the accumulation of dust and corrosion in many dead corners inside the square flue. At present, the flues of coal-fired power plants in my country still mostly use square flues, which are relatively easy to splice at the construction site. [0003] The soot content in the flue gas of coal-fired power plants is very high, especially in the flue section that has just come out of the boiler and has not been purified by environmental protection facilities, soot accumulation is particularly prone to occur in the flue. Even if a circular flue is used, in some inclined sections, due to the reduced exhaust vel...

Claims

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Application Information

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IPC IPC(8): F23J3/02
Inventor 王东歌孟令媛张曦丹
Owner NANJING UNIV OF INFORMATION SCI & TECH
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