Application of single tank energy storage and heat exchange system in hot air non-woven fabric process

doi:10.19799/j.cnki.2095-4239.2022.0106

Abstract

Abstract:

Electricity costs are the second largest production cost in the nonwoven fiber process. A key measure is how to reduce electricity costs and improve profitability. Based on the power consumption strategy of "peak valley flat price" implemented by the state to encourage peak shaving and valley filling of electric power, a single-tank energy storage and heat exchange system for fiber sizing based on energy storage technology is proposed in this paper, and the design methodology of its key parts is described. Combined with the application case of a textile enterprise in Hebei, the economy of the system is analyzed. Through theoretical calculation, using the proposed energy storage heat exchange system can reduce electricity costs by approximately 38% compared to convention fiber heating devices. Due to the cycle of the single pot working medium heat exchanger output drop, must use electric heater can guarantee the process operation, actual saving electricity costs about 25%, which is good economical. This paper also provides support for the application and design methodology of energy storage technology in the textile industry.

Key words: energy storage, non-woven fabric, molten salt, single tank

CLC Number:

TK 02

Hongtao LI, Shuai ZHANG, Xudong LI, Yunguang JI, Mingxu SUN, Xin LI. Application of single tank energy storage and heat exchange system in hot air non-woven fabric process[J]. Energy Storage Science and Technology, 2022, 11(7): 2250-2257.

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性质及组成	NaNO₃	KNO₃	solar salt	Hitec
密度/(kg/m³)	1820	1827	1837	1791
熔点/℃	307	377	220	142
热导/[W/(m·K)]	0.581	0.480	0.519	0.387
比热容/[J/(kg·K)]	1819	1340	1495	1550

项目	单位	参数
储罐设计温度	℃	220～420
储罐加热功率	kW	560
加/释热时间	h	8/16
总空气流量	m³/h	20000
空气进/口温度	℃	120/140
换热功率	kW	280

项目	单位	参数
储罐高度	m	2.8
储罐直径	m	2.6
熔盐量	kg	2.3×10⁴
储热量	J	7.1×10⁹
储罐厚度	mm	12

项目	单位	参数
国产低翅片管内径	m	0.02
翅片管长度	m	0.64
翅片管中心间距	m	0.054
翅片管根数	根	109
迎风面尺寸	m	0.65×0.8
换热器尺寸	m	1×0.6×0.85
总换热系数	W/(m²·℃)	12

时段	河北	浙江	江苏	乌鲁木齐	北京	上海
低谷(8 h)	0.3474元/度	0.3339元/度	0.2589元/度	0.136元/度	0.3242元/度	0.232元/度
平时(8 h)	0.5629元/度	0.8729元/度	0.6068元/度	0.378元/度	0.6246元/度	0.716元/度
高峰(8 h)	0.7784元/度	1.0397元/度	1.0347元/度	0.620元/度	0.934元/度	1.062元/度