Burning power generation utilization method of high-sodium-content coal

A technology for burning power generation and high-sodium coal, applied in the direction of fuel, solid fuel, and special forms of dry distillation, etc. question

Active Publication Date: 2014-07-30
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current application status of high-sodium coal cannot be effectively improved through the design of new boilers burning high-sodium coal or the transformation of existing boilers, and the purpose of purely burning this type of coal in boilers cannot be realized for the time being
[0006] To sum up, there is cur

Method used

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  • Burning power generation utilization method of high-sodium-content coal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 , The characteristics of the high-sodium coal raw coal in the present embodiment are shown in Table 1.

[0028] Table 1. Analysis results of raw coal ash components of high-sodium coal

[0029] Ash component

Na 2 o

K 2 o

CaO

MgO

Fe 2 o 3

SiO 2

al 2 o 3

TiO 2

SO 2

content

6.5

0.65

33.1

9.3

9.0

13.7

6.9

0.4

19.5

[0030] From the analysis results of the coal ash composition in Table 1, the Na in the coal ash 2 The O content is about 6.5%, the CaO content is about 33.1%, and the MgO content is about 9.3%, all of which are much higher than the world’s common coal types, while the acidic oxide SiO 2 Content about 13.5%, Al 2 o 3 The content is only 7%. The slagging index R calculated according to its coal ash composition s and dust deposition index R f They are 1.6 and 20.5 respectively, belonging to strong slagging and ash deposit coal.

[00...

Embodiment 2

[0042] The characteristics of the used high-sodium coal raw coal of the high-sodium coal combustion power generation utilization method in the present embodiment are as follows: dry base ash-free base volatile matter (V daf %) content is 30-50%, the basic metal Na in coal ash 2 O content is 2.0-18.0%, K 2 O content is 0.5-9.5%, CaO content is 6.0-42.0%, MgO content is 1.5-15.0%, Fe 2 o 3 The content is 4.0-18.0%.

[0043] The high-sodium coal combustion power generation utilization method in this embodiment includes the following steps.

[0044] A. Raw coal crushing and wet grinding: crush the high-sodium raw coal, add the crushed raw coal and water to the coal mill for grinding until the particle size of the coal powder is less than 0.2mm, and the ratio of raw coal to water is 1 :1~1:10, the coal slurry is obtained after grinding; the water-soluble sodium in the high-sodium coal raw coal is transferred to the water during the coal grinding process to achieve the purpose o...

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Abstract

The invention relates to a burning power generation utilization method of high-sodium-content coal, aiming at solving the problem that no method with simple process and low processing cost is provided for processing high-sodium-content coal at present. The raw high-sodium-content coal is characterized in that a dry-ash-free volatile component (Vadf %) accounts for 30 to 50% in content; coal ash comprises 2.0 to 18.0% of basic metal Na2O in content, 0.5 to 9.5% of K2O in content, 6.0 to 42.0% of CaO in content, 1.5 to 15.0% of MgO in content, and 4.0 to 18.0% of Fe2O3 in content. The method comprises the following steps: A, crushing the raw coal, and grinding by a wet method; B, mechanically dehydrating pulverized coal; C, drying pulverized coal; D, thermally decomposing coal; E, burning sodium-free coal to generate power. The method is simple in process, low in processing cost and high in utilization rate of coal resource, and can effectively ease the problems that a boiler is easily polluted and slag bonding is generated in the direct burning utilization of the high-sodium-content coal.

Description

technical field [0001] The invention relates to a high-sodium coal combustion power generation utilization method, which belongs to the field of coal processing and utilization, and can effectively alleviate problems such as boiler contamination and slagging that easily occur during the direct combustion and utilization of high-sodium coal. Background technique [0002] Alkali metal sodium is one of the main inorganic elements in coal, and the sodium content in coal ash (taken as Na 2 O) is generally less than 1.5%, and some low-rank coals, such as Xinjiang Zhundong coal in my country, have a sodium content of more than 5%, and some even as high as 7%. Higher sodium content will lead to contamination and slagging of the boiler, affect boiler output, and bring harm to the safe and economical operation of the power plant. Severe slagging may also lead to major accidents such as furnace flameout, tube burst, and unplanned shutdown. Bring greater economic losses to the power pl...

Claims

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Application Information

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IPC IPC(8): C10B53/04C10B57/00C10B57/10C10L9/00C10L9/08
Inventor 王嘉瑞李小江赵冰陈凡敏
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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