Method for improving W-type flame boiler efficiency

A boiler and flame technology, which is applied in the field of improving the furnace efficiency of W-type flame boilers, can solve the problems of large carbon content in fly ash, increased carbon content in slag, complicated aerodynamic field, and reduced furnace efficiency.

Inactive Publication Date: 2017-11-17
中国大唐集团科学技术研究总院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Improper air distribution causes the center of the flame to move up, even forming a double U-shaped flame, and the flame stroke of some boilers becomes shorter, which is not conducive to the combustion of anthracite, the carbon content of fly ash and large slag increase significantly, and the furnace efficiency decreases
[0004] (2) When the organization of the aerodynamic field is unreasonable, it is easy to cause the flame to float upward and directly enter the burnout chamber, causing problems such as overheating of the superheater and reheater, rise in exhaust gas temperature, and slagging at the throat
[0008] (6) The aerodynamic field is relatively complex. If the momentum under the arch is too large, it will easily cause the flame to shoot down the cold ash bucket and cause slagging. If the momentum above the arch is too small, it will cause the flame to lick the throat.
[0009] (7) The boiler structure is relatively complex, the design and installation of the furnace arch is difficult, the layout of the burner air powder pipeline is difficult, the steel consumption is large, the cost is high, and rich operating experience and high operating level are required, and the operation and management costs

Method used

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  • Method for improving W-type flame boiler efficiency
  • Method for improving W-type flame boiler efficiency
  • Method for improving W-type flame boiler efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] The method for improving the efficiency of a W-shaped flame boiler in this embodiment includes:

[0094] Select several coal types, and perform coal quality element and industrial analysis on the selected coal types based on thermogravimetric and infrared analysis;

[0095] Based on the coal elements and industrial analysis results, the combustion strategy of the boiler is predetermined. The combustion strategy specifically includes: (1) The proportion of coal types that can form staged combustion in the boiler and the corresponding coal mill coal grinding mode (2) Can not form a graded coal configuration ratio and the corresponding coal mill coal grinding method in the boiler; wherein, the staged combustion of the boiler is specifically: the use of combustible coal and oxygen to react to become the first-stage combustion , Where the combustible coal is bituminous coal or a mixture of bituminous coal and lean coal; the high-temperature flue gas atmosphere formed in the first...

Embodiment 2

[0155] The method for improving the furnace efficiency of the W-flame boiler in this embodiment, on the basis of Embodiment 1, further includes the steps of determining the F wind downward inclination angle F wind downward inclination angle and the D and E wind opening degrees, which specifically include:

[0156] The boiler uses the fuel staged combustion method for combustion under the following (1), (2), (3) three loads and F wind downtilt angles, and obtains the operating conditions of different F-layer secondary air downtilt angles , Wherein the operating conditions at least include: NOx, CO, O2 in the flue gas at the outlet of the economizer; NOx, CO, and O2 in the flue gas at the outlet of the air preheater; boiler thermal efficiency; coal industry, element analysis; fly ash, Slag sampling analysis; economizer outlet flue gas temperature; air preheater outlet flue gas temperature; raw coal sampling; ambient temperature, humidity and atmospheric pressure;

[0157] Among them,...

Embodiment 3

[0233] Such as figure 2 As shown, the method for improving the efficiency of the W-flame boiler in this embodiment is that the wing wall is longitudinally opened with 4 ventilation slits to blow the secondary air inward, the outer diameter of the water wall tube at the wing wall is larger (120.65mm), and the center distance is 146.4 mm, the pipe gap is 25.4mm, and the outer diameter of the upper and lower pipes on the wing wall is small (69.85mm). The original design uses a reducing pipe to connect the two ends, and only needs to replace the thick pipes at the four ventilation belts that need ventilation For the thin tube (moving the upper and lower head position down), the tube gap can be changed to 76.55mm wide, and the ventilation effect is good, which can prevent large-area coking of the wing wall water wall tube, and increase the wing wall anti-coking wind optimization plan such as figure 2 Shown. The height of the ventilation belt can be set to the total length of the wi...

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Abstract

The invention relates to a method for improving W-type flame boiler efficiency. The method comprises steps of conducting coaly element and industrial analysis to a selected coal type, presetting a boiler combustion strategy, conducting boiler fuel combustion simulation according to the preset combustion strategy to acquire a boiler work condition, comparing and analyzing boiler work conditions upon different combustion strategies to acquire an optimal boiler grading combustion coaly proportion and coal grinding machine coal powder injection way. A proportion of the burning coal and anthracite can be well determined during the boiler grading combustion by the use of the method.

Description

Technical field [0001] The invention relates to a method for improving the efficiency of a W-shaped flame boiler. Background technique [0002] The main problems of W-flame boiler: [0003] (1) Improper air distribution causes the flame center to move up, or even form a double U-shaped flame. Some boilers shorten the flame stroke, which is not conducive to the combustion of anthracite. The carbon content of fly ash and large slag is significantly increased, and the efficiency of the furnace is reduced. . [0004] (2) When the aerodynamic field organization is unreasonable, it is easy to cause the flame to float upward and directly enter the burnout chamber, causing problems such as overheating of the superheater and reheater, increased exhaust gas temperature, and slagging at the throat. [0005] (3) Because the temperature in the furnace is higher than 1500℃ (the temperature at which thermal NOx is generated), the amount of NOx generated is larger, which is higher than the general l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23K1/00F23L9/00F23N3/00F23C7/04
CPCF23C7/04F23K1/00F23L9/00F23N3/00Y02E20/34
Inventor 张新
Owner 中国大唐集团科学技术研究总院有限公司
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