超长距蒸汽供热管道保温性能分析

doi:10.3969/j.issn.2097-0706.2023.04.007

综合智慧能源 ›› 2023, Vol. 45 ›› Issue (4): 47-51.doi: 10.3969/j.issn.2097-0706.2023.04.007

超长距蒸汽供热管道保温性能分析

商永强¹(), 王文峰¹, 王为术²^,^*(), 郭嘉伟², 郑毫楠², 葛学文²

1.华电郑州机械研究院有限公司, 郑州 450046
2.华北水利水电大学电力学院, 郑州 450045

收稿日期:2021-01-08 修回日期:2022-03-22 接受日期:2023-02-27 出版日期:2023-04-25 发布日期:2023-05-06
通讯作者: 王为术
作者简介:商永强（1981），正高级工程师，从事火力发电、节能供热设计和工程管理方面的工作，7522051@qq.com；
基金资助:
中国华电集团科技项目(CHDKJ18-01-47)

Analysis on the thermal insulation of long-distance steam heating pipes

SHANG Yongqiang¹(), WANG Wenfeng¹, WANG Weishu²^,^*(), GUO Jiawei², ZHENG Haonan², GE Xuewen²

1. Huadian Zhengzhou Mechanical Design Institute Company Limited, Zhengzhou 450046, China
2. School of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.

Received:2021-01-08 Revised:2022-03-22 Accepted:2023-02-27 Online:2023-04-25 Published:2023-05-06
Contact: WANG Weishu
Supported by:
Science and Technology Program of China Huadian Corporation Limited(CHDKJ18-01-47)

摘要/Abstract

摘要：

针对热电联产蒸汽长距离运输过程中保温的问题，结合某管网工程，采用数值模拟的方法，研究了不同敷设方式管网的散热特性，并根据设计负荷计算了管网用户处的蒸汽参数。研究结果表明，在蒸汽供热管道中，空气层和土壤可一定程度上降低管道中蒸汽的热损失，对管道起到保温效果，直埋敷设管段的热损失要小于架空敷设管段。当管网负荷较低时，部分用户处会出现冷凝，负荷增大会使管道温降减小，压降增大。该研究为供热管道工程优化提供理论基础。

关键词: 数值模拟, 热电联产, 供热管网, 节能降损, 蒸汽供热

Abstract:

In order to solve the thermal insulation problem in the long-distance transportation of cogeneration steam，a pipe network project undertaken was simulated to study its heat dissipation characteristics under different laying schemes.And the steam parameters at the network's user side were calculated based on the design load.The simulation results show that laying an air layer and soil over the steam heating pipes can reduce the heat loss of the pipes to a certain extent，so as to improve the thermal insulation of the pipelines.The heat loss of the directly buried section is less than that of the overhead pipe section.Since the increase of the load will reduce the temperature drop of the pipe and increase the pressure drop，condensation will occur at some user ends when the load of the pipe network is low.This simulation facilitates the theoretical study on heating pipe allocation optimization.

Key words: numerical simulation, cogeneration, heating pipe network, energy conservation and loss reduction, steam heating

中图分类号:

TK11：TM621

商永强, 王文峰, 王为术, 郭嘉伟, 郑毫楠, 葛学文. 超长距蒸汽供热管道保温性能分析[J]. 综合智慧能源, 2023, 45(4): 47-51.

SHANG Yongqiang, WANG Wenfeng, WANG Weishu, GUO Jiawei, ZHENG Haonan, GE Xuewen. Analysis on the thermal insulation of long-distance steam heating pipes[J]. Integrated Intelligent Energy, 2023, 45(4): 47-51.

图/表 11

图1

表1

图2

表2

保温材料导热系数

保温材料	导热系数λ/[W·（m·K）^-1]
玻璃棉	$λ = 2.907 1 × 102 + 1.102 2 × 10 - 4 T + 7.652 29 × 10 - 10 T 3$
摩根	$λ = 0.03 + 0.000 2 × (T - 150)$
CNT	$λ = 0.031 + 0.000 092 5 × (T - 70)$

表2

表3

湍流方程经验系数

项目	$C μ$	$C 1 ε$	$C 2 ε$	$σ k$	$σ ε$
数值	0.09	1.44	1.92	1.00	1.30

表3

图3

图4

图5

图6

表4

表5

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管道规格	流域直径	管壁厚度	第1层保温层厚度	第2层保温层厚度	外套管厚度
DN400	426.0	9.0	60.0	60.0	9.0
DN350	377.0	9.0	75.0	75.0	9.0
DN300	325.0	8.0	85.0	85.0	9.0
DN250	273.0	6.5	100.0	100.0	9.0
DN200	219.0	6.0	90.0	90.0	9.0
DN150	159.0	4.5	45.0	45.0	8.0
DN100	108.0	4.0	55.0	55.0	8.0
DN50	89.0	4.0	50.0	50.0	7.0

用户	出口温度
用户	工况1	工况2	工况3
1	553.955 27	580.648 16	584.533 41
2	563.985 96	584.435 39	588.390 79
3	517.457 21	540.011 03	543.169 64
4	489.135 11	507.781 73	510.398 30
5	514.697 21	559.722 06	564.175 38
6	515.845 23	555.672 93	570.058 44
7	503.812 30	548.355 90	561.833 22
8	489.903 49	535.947 00	548.531 85
9	472.416 50	512.943 70	523.423 40
10	514.710 33	561.504 36	569.574 81
11	443.391 42	553.667 77	561.410 87
12	521.563 37	567.407 03	576.137 87
13	428.303 68	530.041 37	537.095 65
14	445.738 34	538.129 33	561.410 87
15	504.258 78	557.478 22	565.625 21
16	507.633 15	558.861 97	567.065 72

用户	出口压力
用户	工况1	工况2	工况3
1	1.903	1.740	1.662
2	1.907	1.775	1.697
3	1.898	1.761	1.686
4	1.893	1.755	1.681
5	1.881	1769	1.648
6	1.862	1.723	1.518
7	1.862	1.722	1.519
8	1.856	1.705	1.502
9	1.830	1.662	1.473
10	1.876	1.736	1.578
11	1.875	1.703	1.545
12	1.876	1.733	1.575
13	1.869	1.672	1.515
14	1.870	1.692	1.545
15	1.864	1.677	1.520
16	1.863	1.677	1.520

超长距蒸汽供热管道保温性能分析

Analysis on the thermal insulation of long-distance steam heating pipes

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