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How to Improve Furnace Efficiency of W Type Flame Boiler

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 steel consumption, reduced furnace efficiency, and upward movement of the flame center.

Inactive Publication Date: 2020-01-03
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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  • How to Improve Furnace Efficiency of W Type Flame Boiler
  • How to Improve Furnace Efficiency of W Type Flame Boiler
  • How to Improve Furnace Efficiency of W Type Flame Boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0095] Based on the coal quality elements and industrial analysis results, the combustion strategy of the boiler is predetermined, and the combustion strategy specifically includes: (1) the proportion of coal types that can form staged combustion in the boiler and the corresponding coal pulverizer coal grinding method ; (2) Can not form the proportion of classified coal configuration in the boiler and the corresponding coal mill coal grinding method; wherein, the classified combustion of the boiler is specifically: using combustible coal to react with oxygen to become the first-stage combustion , where the combustible coal is bituminous coal or a mixture of bituminous coal and lean coal; the high-...

Embodiment 2

[0155] The method for improving the furnace efficiency of a W-shaped flame boiler in this embodiment, on the basis of Embodiment 1, also includes: the steps of determining the F wind downtilt angle F wind downtilt angle and the D and E wind openings, specifically including:

[0156] Under the conditions of the following three loads (1), (2) and (3) and F wind downtilt angle, the boiler adopts the fuel staged combustion method to burn, and obtains the operation status of the secondary air downtilt angle in different F layers , wherein the operating conditions at least include: NOx, CO, O2 of the flue gas at the outlet of the economizer; NOx, CO, O2 of the flue gas at the outlet of the air preheater; the thermal efficiency of the boiler; 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, (1) under the 325MW load, the F wind downt...

Embodiment 3

[0233] Such as figure 2 As shown, the method for improving the efficiency of the W-shaped flame boiler in this embodiment is to open four ventilation slots in the wing wall to blow the secondary air inward. 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 connects the two ends through the reducing pipe, and only needs to replace the thick pipe at the four ventilation belts that need ventilation For thin tubes (move the position of the upper and lower heads), the gap between the tubes can be widened to 76.55mm, the ventilation effect is good, and it can prevent large-area coking of the wing wall water-cooled wall tubes. figure 2 shown. The height of the ventilation belt can be set to the total length of the wing wall pipes, or only set on the half part of the wing wall. The longer the ventilation belt, the more obvious the effect.

[0234] This method does not need to remove a large area...

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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 furnace efficiency of a W-shaped flame boiler. Background technique [0002] The main problems of W-type flame boilers: [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, rising exhaust gas temperature, and slagging at the throat. [0005] (3) Since the temperature in the furnace is higher than 1500°C (the temperature at which thermal NOx is generated), the amount of NOx generated is relat...

Claims

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Application Information

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Patent Type & Authority Patents(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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