Characteristics analysis of the phase change thermal storage equipment for medium and low temperature flue gas from steel industry

doi:10.19799/j.cnki.2095-4239.2020.0051

Abstract

Abstract:

Presently, Chinas steel industry works with rich media and low heat resources. Because the industry wastes a wide span of heat energies, operates over a large temperature range, and is intermittent and unstable, the existing technology of heat recovery is insufficient. Phase-changing thermal storage materials have become a research hotspot because their heat storage density is high and their temperature remains constant during heat storage and release. This paper introduces the design and manufacture of test equipment based on NaNO₃/SiO₂ as the phase-change thermal storage material and analyzes its characteristics. In an experimental evaluation of the test equipment, the highest heat storage efficiency was 68.3% and the highest exothermal efficiency reached approximately 60%.

Key words: phase change thermal storage, heat recovery, steel industry

CLC Number:

TK 02

SUN Shoubin, YAO Hua, LIU Changpeng, HUANG Yun, MA Guangyu, ZHANG Tianfu, WANG Xiangfeng. Characteristics analysis of the phase change thermal storage equipment for medium and low temperature flue gas from steel industry[J]. Energy Storage Science and Technology, 2020, 9(3): 730-734.

Figures/Tables 13

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References 6

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序号	仪表名称	型号	精度	测量范围	用途
1	铠装热电偶	K	±0.4%t	0～1300 ℃	温度检测
2	微压计	DP1000	0.5级	0～±20 kPa	压力检测
3	低温热像仪	Flir T420	0.1%	0～1200 ℃	表面温度检测
4	红外烟气分析仪	Vario plus	1 ppm	1～1000 ppm	烟气成分检测

设计参数	数值	设计参数	数值
烟气体积流量 /m³·h^-1	5000	储热砖尺寸（长×宽×高）/mm	230×115×57
烟气入口温度/℃	430	设备尺寸/ mm	2220×2670×1000
烟气出口温度/℃	200	储热砖熔化温度/℃	310
烟气放热量/GJ	1.58	储热密度/J·g^-1	267.76
空气体积流量/m³·h^-1	3100	储热时间/ h	2
空气流速（宽通道）/m·s^-1	5.3	储热砖密度/ kg·m^-3	2000
空气流速（窄通道）/m·s^-1	10.5	储热材料总质量/kg	5010.9
空气温差/℃	270	水质量流量/t·h^-1	6.2
最高使用温度/℃	600	水流速/m·s^-1	0.6
入口冷水温度/℃	20	出口热水温度/℃	60

参数	工况1	工况2	工况3	工况4	工况5	工况6
烟气流量/Nm³·h^-1	2400	1800	1500	1800	1800	1800
出炉烟气温度/℃	508	556	556	556	553	549
烟气入口温度/℃	398	479	479	479	473	453
循环风量/Nm³·h^-1	2000	2000	2000	2000	2000	1600
水流量/m³·h^-1	3	3	3	2	1.5	3

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