燃气设计说明书

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摘要

城市燃气是城市建设的重要基础设施之一，也是城市能源供应当中一个重要组成部分，它为城市工业、商业和居民生活提供优质气体燃料。城市燃气输配系统的绝大部分系统的绝大部分工程量，属与城市地下基础工程。

本设计的主要内容为老城区天然气供应的规划。该设计使用的天然气管道主要是无缝钢管。XX区总供气面积为237公顷，人口达万，属于小型城市，居住也比较集中。进行规划时除建设接收长输管线天然气的门站外，还设置区域调压站。因此，除管网的水利计算外，还有门站，区域调压站的设备选型计算。本设计囊括了从长输管线到门站，经过区域调压站最后进入区域管网的过程。幸福小区有79栋楼，共948户，包括了平面管网的布置，用户引入管的设计，单管阀门井的设计，凝水缸的设计。

关键词：天然气门站管道工艺流程节点压力流量"

Abstract

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City gas is an important city-building infrastructure as urban energy is also an important component of the urban industrial, commercial and residential gas by the ways of providing quality gas . City gas transmission and distribution system is a basic project of the urban underground works in the vast majority of engineering systems.

The main elements of the design is the planning of natural gas supply in Laocheng district . Seamless steel pipe is used as gas pipeline in this design. Laocheng district which covers a supply area of 237 hectares , population 94,800, is a small city and the living is also relatively concentrated. Not only is a gas storage and distribution station in need ,but also a regional regulator station need to be set up when planning to receive long-distance pipeline. Therefore, in addition to the water pipe network computing, there are equipment selections of Storage and Distribution Station, regional regulator stations .The design mainly includes

long-distance pipelines from the reservoir distribution stations, regulator stations, after the regional final to enter the process of regional pipeline network. There were79 residential buildings,

a total of 948, in Xingfu layout of flat pipe network , the design of user conductor and the design of condensate water tanks are included .

Key words: Natural Gas ；Storage and Distribution Station ；pipeline；Technological process ；joint pressure；flux

目录

1 原始资料 (1)

用气量指标 (1)

基本参数 (2)

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2 天然气性质的计算 (4)

天然气平均分子量 (5)

天然气的平均密度 (5)

相对密度 (6)

粘度 (6)

爆炸极限 (8)

干湿燃气的高低热值 (10)

3 用气量的计算 (12)

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各类用户用气量计算 (12)

绘制储气变化曲线 (15)

4 燃气管网规划 (19)

燃气管网系统选择和管线的布置原则 (19)

调压站 (23)

调压器 (27)

管道、阀门的选择 (31)

水力计算 (34)

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5 门站设计 (40)

门站设计 (40)

门站平面布置 (41)

储气罐的选择 (43)

6 小区燃气设计 (44)

布线 (44)

燃气区域调压柜 (49)

水力计算 (50)

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设备选择 (56)

管道埋设 (59)

7 设计总结 (61)

参考文献 (62)

致谢 (63)

1 原始资料

本设计所给的图纸包括城市规划资料（附城市规划图）、小区平面图（未标明层数的建筑以6层计）。

用气量指标

城市人口密度：400人/公顷，气化率94%，无集中供暖。

城市用气量指标选择

（1）城市居民生活用气量指标可以按如下选择：

无集中供暖的用户：1884-2303MJ/（人.年）

（2）公共建筑用气量指标按下表选择

表公共建筑用气量指标