Method for assisting in igniting low-volatile coal in burning by adding oxygen

A low-volatility, low-volatility technology, applied in the field of ignition systems, can solve the problems of low-volatility, low-volatility, oxygen addition ratio, and structure without more detailed regulations, so as to optimize combustion, accelerate combustion speed, increase coal adaptive effect

Inactive Publication Date: 2012-06-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the micro-oil ignition technology has been widely used in pulverized coal boiler power plants, and the technology is relatively mature, but generally the adaptability to lean coal and anthracite is not very good
This is due to the low volatile content of lean coal and anthracite coal, and the ignition of its pulverized coal requires higher temperature and energy to promote the pyrolysis of pulverized coal particles into volatiles and coke, and ignites the volatiles, and then ignites the coke. The limited ignition energy and the low volatile matter of lean coal make the energy generated by volatile matter combustion low in the initial stage of combustion, which in turn makes the ignition effect of general pulverized coal micro-oil ignition burners not good for low volatile matter coal.
In the application number 201110086497.X, named "Low Volatile Pulverized Coal Burner", a pulverized coal channel is formed between the central air duct of the first-stage combustion chamber and the coal air duct, and the central air duct is fixed outwards in sequence with coaxial fixed shafts. The air flow pipe is obliq

Method used

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  • Method for assisting in igniting low-volatile coal in burning by adding oxygen
  • Method for assisting in igniting low-volatile coal in burning by adding oxygen
  • Method for assisting in igniting low-volatile coal in burning by adding oxygen

Examples

Experimental program
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Effect test

Embodiment 1

[0012] The low volatile oxygen supplemented micro-oil ignition burner used, such as figure 1 As shown, the oxygen-supplementing micro-oil ignition burner in the combustion chamber includes four parts: a pulverized coal concentrator, a pulverized coal graded combustion chamber, an oil gun and an oxygen supply pipe. A pulverized coal concentrator 2 whose inner diameter gradually decreases is arranged on the inner wall of the housing 1 near the inlet section (primary air inlet). The back of the pulverized coal concentrator 2 is connected to the third-stage combustion chamber, and the combustion chambers are connected to each other through supporting ribs. The connection and fixing of the combustion chamber 5, the second-stage combustion chamber is fixed by the second-stage rear rib 7, the second-level front rib 8 and the first-stage rear rib 9 with the first-stage combustion chamber 3, and the third-stage combustion chamber 6 The rear end is a flame-stabilizing structure whose i...

Embodiment 2

[0014] The difference between embodiment 2 and embodiment 1 is that the way of adding the oxygen supply tube is different, such as image 3 As shown in the projected cross-sectional diagram of the middle oxygen supply pipe entering the inlet of the burner, the oxygen supply pipe in Example 2 uses two oxygen supply pipes, and the oxygen supply pipe enters the burner in a hedging manner. The two oxygen supply pipes in Embodiment 2 can also be arranged in a radial and tangential direction. When arranged tangentially, the included angle between the axis of the oxygen supply pipe and the normal of this point is 10-20°. Other aspects are basically consistent with Example 1.

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Abstract

The invention belongs to ignition system range, and particularly relates to a method for assisting in igniting low-volatile coal in burning by adding oxygen. Firstly, an existing low-volatile oxygen supplementation tiny-oil ignition burner is used, three stages of burning chambers are arranged in a shell, all igniting chambers and flame guiding tubes are controlled to be axially inclined towards the primary burning chamber by the same included angle of 60 degrees, and all oxygen supplementation tubes are controlled to be axially inclined towards the primary burning chamber by the same included angle of 75-80 degrees. Secondly, oxygen-enriched airflow enters the middle rear of the primary burning chamber obliquely along the oxygen supplementation tubes, burning of low-volatile pulverized coal is promoted, coal adaptability of tiny-oil ignition is enhanced, oil flames are stabilized, disturbed heating of coal stream in the primary burning chamber is increased, and burning is optimized. The oxygen supplementation tubes supplement oxygen to the middle rear of the primary burning chamber, burning is accelerated, burning of the low-volatile pulverized coal is enhanced and stabilized, coal adaptability of tiny-oil ignition is further enhanced, and the requirements of a boiler burning the low-volatile coal on tiny-oil ignition and low-load stable burning are met.

Description

technical field [0001] The invention belongs to the scope of an ignition system, and in particular relates to a method for auxiliary ignition of low volatile coal combustion by adding oxygen. Background technique [0002] With the continuous growth of my country's economy, my country's energy development is facing many challenges, especially the economic growth rate and economic structure directly affect the growth rate of power demand. In my country's current power structure, thermal power accounts for a large proportion. By the end of 2008, thermal power accounted for 75.87% of the total capacity. The direct energy sources of thermal power are coal and oil, and the consumption of oil is mainly in the ignition stage and the process of stable combustion under low load. The ignition and stable combustion of pulverized coal boilers consume a large amount of fuel oil, resulting in an increasing consumption of high-quality fuel oil. According to statistics, the boiler of a 125...

Claims

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Application Information

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IPC IPC(8): F23D1/00F23L7/00
CPCY02E20/34
Inventor 付忠广张永生
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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