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Efficiency-improving method for W-type flame boiler grading combustion

A staged combustion and boiler technology, applied in the direction of combustion methods, control combustion, combustion equipment, etc., can solve the problem of reducing the emission of pulverized coal furnaces

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

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Problems solved by technology

Although a small amount of NO will be regenerated during the burnout process, in general, after using the reburning technology, the final emissions of pulverized coal furnaces will be greatly reduced

Method used

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  • Efficiency-improving method for W-type flame boiler grading combustion
  • Efficiency-improving method for W-type flame boiler grading combustion
  • Efficiency-improving method for W-type flame boiler grading combustion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087]In this embodiment, the method for improving efficiency by staged combustion of a W-type flame boiler includes:

[0088] Select several coal types, and conduct coal quality element and industrial analysis on the selected coal types based on thermogravimetric and infrared analysis;

[0089] 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 ...

Embodiment 2

[0148] In this embodiment, on the basis of Embodiment 1, the stepwise combustion efficiency improvement method for a W-type flame boiler also includes: the steps of determining F wind downtilt angle F wind downtilt angle and D and E wind opening degrees, specifically including:

[0149] 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;

[0150] Among them, (1) under the 325MW load, the F wind d...

Embodiment 3

[0225] Such as figure 2 As shown, in this embodiment, the staged combustion efficiency improvement method for W-shaped flame boilers, four ventilation slots are opened longitudinally in the wing wall to blow secondary air inward, and the outer diameter of the water-cooled wall tube at the wing wall is relatively large (120.65mm), and the center distance is 146.4mm, 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 connect the thick pipes at the four ventilation belts that need to be ventilated. Replace it with a thin tube (move the position of the upper and lower heads), and 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 water-cooled wall tubes of the wing wall. figure 2 shown. The height of the ventilation belt can be set to the total length of ...

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Abstract

The invention relates to an efficiency-improving method for W-type flame boiler grading combustion. The efficiency-improving method comprises steps of analyzing coaly element and proximate analysis to selected coal, presetting a boiler combustion strategy, simulating boiler fuel combustion according to the preset combustion strategy to acquire a boiler work condition, and conducting comparison analysis to boiler work conditions according to different combustion strategies to acquire an optimal boiler grading combustion coal proportion and a coal injection way of a coal grinding machine. Burning coal and anthracite proportion during the boiler grading combustion process can be well determined.

Description

technical field [0001] The invention relates to a method for improving the efficiency of staged combustion of a W-shaped flame boiler. Background technique [0002] The traditional fuel staged combustion technology is also called secondary combustion technology or tertiary combustion technology, which is characterized by dividing the combustion into three areas, namely the primary combustion area and the second combustion area. The primary combustion zone is an oxidizing or weakly reducing atmosphere; the second combustion zone sends secondary fuel into the furnace to make it a reducing atmosphere (α<1). Under high temperature and reducing atmosphere, CH atomic groups are generated, which react with NOx generated in the primary combustion zone, and mainly generate NO2. This zone is collectively called the reduction zone or the reburning zone, and the secondary fuel is usually called the reburning fuel; in the reducing zone Above, the secondary air is sent to make it also...

Claims

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Application Information

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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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