实用工程长距离供热管道系统延迟时间运行调节分析

IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Sustainable Energy Grids & Networks Pub Date : 2024-09-13 DOI:10.1016/j.segan.2024.101526
Xueying Sun , Wenke Zheng , Fang Wang , Haiyan Wang , Yiqiang Jiang , Zhiqiang Bai , Junming Jiao , Chengbin Guo
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引用次数: 0

摘要

区域供热网络(DHN)的分布范围很广,供热管道在传热过程中存在固有的时间延迟和热损失。长距离供热管道内的传热延迟可能会导致向终端用户供热不足或热源能耗过高。因此,本文提出了一种计算长距离供热管道中传输延迟时间的准动态模型。并通过从供热管道中获得的测量值对模型进行了验证。进一步讨论了延迟时间的影响因素,包括运行参数、管道结构参数和隔热层厚度。此外,还分析了管道延迟时间在实际工程中的影响。在实际工程中,即使室外温度变化相同,当管道结构或运行参数不同时,传输延迟时间也会不同。进水温度和质量流量的变化会影响出水温度的变化率,从而影响延迟时间。此外,延迟时间随管道长度、直径和隔热层厚度的增加而增加,但隔热层厚度对延迟时间的影响很小。当进水温度上升或下降 5℃时,每 1 千米管道长度的延迟时间分别增加 70%以上,每 100 毫米直径的延迟时间增加 40%左右,每 100 毫米隔热层厚度的延迟时间减少 2%。
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Analysis of operation regulation on delay time in long-distance heating pipe systems for practical engineering

The distribution area of the district heating network (DHN) is extensive, and there are inherent time delays and thermal losses in the process of heat transfer through heating pipes. The delay in heat transfer within long-distance heating pipes may result in inadequate heat supply to end-users or excessive energy consumption at the heat source. Therefore, this paper presents a quasi-dynamic model for calculating the transmission delay time in the long-distance heating pipeline. And the model is validated through the measured values obtained from a heating pipeline. The influencing factors of delay time are further discussed, including operating parameters, pipe structure parameters and thermal insulator thickness. Additionally, the impact of pipe delay time in practical engineering is analyzed. In practical engineering, the transmission delay time varies when the pipe structural or operational parameters differ, even under the same outdoor temperature change. The change in inlet water temperature and mass flow rate can impact the change rate of outlet water temperature, thereby influencing the delay time. Furthermore, the delay time exhibited an increase with pipe length, diameter, and thermal insulator thickness; however, the effect of thermal insulator thickness on it was minimal. When the inlet water temperature rose or dropped by 5℃, the delay time grew by more 70 % per 1 km pipe length, about 40 % per 100 mm diameter and less 2 % per 100 mm thermal insulator thickness, respectively.

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来源期刊
Sustainable Energy Grids & Networks
Sustainable Energy Grids & Networks Energy-Energy Engineering and Power Technology
CiteScore
7.90
自引率
13.00%
发文量
206
审稿时长
49 days
期刊介绍: Sustainable Energy, Grids and Networks (SEGAN)is an international peer-reviewed publication for theoretical and applied research dealing with energy, information grids and power networks, including smart grids from super to micro grid scales. SEGAN welcomes papers describing fundamental advances in mathematical, statistical or computational methods with application to power and energy systems, as well as papers on applications, computation and modeling in the areas of electrical and energy systems with coupled information and communication technologies.
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