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Blending method for power station pulverized coal boiler safe burning ramsbottom coke

A pulverized coal boiler and semi-coke technology, which is applied in the blending field of safely burning semi-coke in power station pulverized coal boilers

Active Publication Date: 2015-07-22
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, there is no method that can guide the power plant pulverized coal boiler to control the proportion of semi-coke burning, so as to ensure the safety and economy of using semi-coke in the power plant pulverized coal boiler

Method used

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  • Blending method for power station pulverized coal boiler safe burning ramsbottom coke
  • Blending method for power station pulverized coal boiler safe burning ramsbottom coke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] According to GB / T 219-2008 "Measurement Method for Fusibility of Coal Ash" and GB / T 465-2007 "Test Method for Scouring Wear Index of Coal", the ash softening temperature ST and scouring wear index of Zhungeer Coal and Blue Coal were respectively measured Ke.

[0033] The ash softening temperature ST of Zhungeer coal is more than 1500 ℃, which belongs to slight slagging coal; the ash softening temperature ST of semi-coal is 1150 ℃, which belongs to serious slagging. The preliminarily determined semi-coke can be blended with 40-50% Zhungeer coal.

[0034] The scour wear index of Zhungeer coal is Ke=3, which belongs to strong wear grade; the scour wear index of semi-coal is Ke=27.7, which belongs to the third extremely strong wear grade. For the boiler equipped with steel ball mill pulverizing system, the scouring wear index Ke of mixed coal is controlled below 15, and the finally determined semi-coke blending ratio is 40%.

Embodiment 2

[0036] In this example, a coal blend of quasi-mix 5 (ST > 1500°C, Ke = 3) and semi-coke (ST = 1150°C, Ke = 27.7) is used on the 300MW unit boiler equipped with a steel ball mill pulverizing system. The ratio of blue charcoal blending determined in the present invention is 40%. Such as figure 1 As shown, there is no obvious change in the flue gas temperature at the outlet of the boiler furnace after blending 40% semi-coke, indicating that there is no obvious slagging phenomenon in the boiler furnace. In addition, the steam and water parameters of the boiler are normal, and the boiler can operate safely and stably. Such as figure 2 As shown, there is basically no change in the carbon content of fly ash combustibles in the boiler exhaust before and after blending 40% blue-coke, indicating that the boiler has good adaptability to 40% blue-coke blended coal.

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Abstract

The invention discloses a blending method for power station pulverized coal boiler safe burning ramsbottom coke. The blending method for the power station pulverized coal boiler safe burning ramsbottom coke comprises the following steps that 1, ash softening temperature ST of the ramsbottom coke and a coal sample is measured; 2, erosion wear index Ke of the ramsbottom coke and the coal sample is measured; 3, with the total weight of coal used for burning as a benchmark, the ramsbottom coke and the coal sample are blended by the weight percentage to obtain the premixed coal after being blended; 4, grading is performed on the wear property of the premixed coal according to the erosion wear index Ke; 5, on the basis of the step 3, according to the erosion wear index Ke value obtained by measuring in the step 2, the erosion wear index Ke of the premixed coal after the ramsbottom coke and the coal sample are blended is converted, the final ramsbottom coke blending proportion is determined by combining with the grade of the wear property of the premixed coal, and finally, the mixed coal with determined blending proportion is fed into a boiler for burning. According to the blending method for the power station pulverized coal boiler safe burning ramsbottom coke, the power station pulverized coal boiler safe burning ramsbottom coke is achieved through the blending of the coal sample and the ramsbottom coke of different slagging properties and erosion wear properties.

Description

Technical field: [0001] The invention relates to a blending method for safely burning semi-coke in a pulverized coal boiler of a power station. By blending coal samples with different slagging properties and wear properties with the semi-coke, the pulverized coal boiler in a power station can safely use semi-coke. Background technique: [0002] Semi-coke is a solid carbon product with low volatile content obtained by dry distillation and pyrolysis of non-caking or weakly cohesive high-volatile bituminous coal under medium and low temperature conditions. It has the characteristics of (extra) low ash, low sulfur, and medium-high calorific value. , is a clean and environmentally friendly fuel that can be used as an excellent power coal. At present, the problem of surplus in my country's semi-coke industry is serious, and it is urgent to resolve it through the use of pulverized coal boilers in power stations. However, the severe slagging performance of semi-coke and the extreme...

Claims

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Application Information

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IPC IPC(8): F23K1/00
Inventor 姚伟杨忠灿王志超刘家利蒙毅王桂芳李仁义
Owner XIAN THERMAL POWER RES INST CO LTD
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