惰性气氛下准东煤Na/Ca释放特性的研究

杨燕梅; 张扬; 张海; 吴玉新; 刘青; 吕俊复

惰性气氛下准东煤Na/Ca释放特性的研究

杨燕梅^{1, 2},
张扬¹,
张海^1, ,,
吴玉新¹,
刘青¹,
吕俊复¹

1.
清华大学能源与动力工程系热科学与动力工程教育部重点实验室, 北京 100084
2.
中国标准化研究院, 北京 100191

基金项目:

国家科技支撑计划 2015BAA04B01

国家科技支撑计划 2015BAA04B02

详细信息

中图分类号: TK6
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- 文章访问数: 62
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- 被引次数: 0
出版历程
- 收稿日期: 2018-01-04
- 修回日期: 2018-02-08
- 网络出版日期: 2021-01-23
- 刊出日期: 2018-04-10

Release characteristics of Na/Ca in Zhundong coal under inert atmosphere

1.
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
2.
China National Institute of Standardization, Beijing 100191, China

Funds:

National Science and Technology Support Project of China 2015BAA04B01

National Science and Technology Support Project of China 2015BAA04B02

More Information

Corresponding author: ZHANG Hai, E-mail: haizhang@mail.tsinghua.edu.cn

摘要

摘要: 基于准东煤中Na/Ca的赋存形态，采用管式加热炉研究了准东煤中Na/Ca在惰性气氛下的释放特性和形态转变。结果表明，水溶态Na_w在加热温度t ≤ 600℃时先转变成不可溶态Na_re，随着温度升高，不可溶态Na_re又重新转变成水溶态Na_w，当加热温度t > 800℃时，Na大量释放。酸溶态Ca_ac在加热温度t ≤ 700℃时先分解生成CaO并且与其他矿物组分反应转变成不可溶态Ca_re，随着温度升高，不可溶态Ca_re逐渐转变成酸溶态Ca_ac和水溶态Ca_w。相同温度条件下，Ca的释放率低于Na的释放率，少量酸溶态有机Ca随挥发分释放而以气相形式释放。
- 准东煤 /
- Na/Ca /
- 释放特性 /
- 形态转变
Abstract: The release and transformation characteristics of Na/Ca in Zhundong coal under inert atmosphere were studied by using tubular heating furnace based on occurrence modes of Na/Ca containing species. It is found that water soluble Na_w firstly transfers to insoluble Na_re when the heating temperature is lower than 600℃. As the temperature increases, insoluble Na_re transfers back to water soluble Na_w. Large amount of Na releases when the temperature is higher than 800℃. Acid soluble Ca_ac firstly decomposes to CaO when the heating temperature is lower than 700℃, and CaO reacts with other minerals to form insoluble Ca_re. As the temperature increases, insoluble Ca_re transfers to acid soluble Ca_ac and water soluble Ca_w. At the same temperature, the release rate of Ca is lower than that of Na. Moreover, a little amount of acid soluble organic Ca will release when the volatile matter releases.
- Zhundong coal /
- Na/Ca /
- release characteristics /
- transformation

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图 1 管式加热炉系统示意图

Figure 1 System of tubular heating furnace

1: control cabinet; 2: sampling tube; 3: transformer; 4: vacuum pump; 5: thermocouple; 6: heating unit; 7: tubular furnace; 8: sample; 9: clamp; 10: sample carrying tube; 11: operating handle; 12: cylinder

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图 2 惰性气氛下挥发分及Na/Ca的释放率

Figure 2 Release rate of volatile matter and Na/Ca under inert atmosphere

(a): release rate of volatile matter; (b): release rate of Na; (c): release rate of Ca

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图 3 含Na矿物的形态转变

Figure 3 Transformation of Na-containing minerals

┈■┈: Na_w; ┈●┈: Na_ex; ┈▲┈: Na_ac; ┈▼┈: Na_re; ┈★┈: Na_g

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图 4 含Ca矿物的形态转变

Figure 4 Transformation of Ca-containing minerals

┈■┈: Ca_w; ┈●┈: Ca_ex; ┈▲┈: Ca_ac; ┈▼┈: Ca_re; ┈★┈: Ca_g

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表 1 样品的工业分析和元素分析

Table 1 Ultimate and proximate analyses of tested coals

Coal	Proximate analysis w_ad/%				Ultimate analysis w_ad/%
Coal	M	A	V	FC	C	H	N	S	O	Cl
ZD-1	18.61	4.12	28.03	49.23	66.14	3.53	1.00	0.08	5.77	0.75
ZD-2	13.24	6.10	24.92	55.74	67.63	3.48	0.84	0.44	8.18	0.09
note: determination of chloride is referred to GB/T 3558—2014 Determination of chlorine in coal

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