﻿ 肯尼亚Olkaria地热资源井口分布式地热电站抽真空系统的优选 Optimal Selection of Vacuum System for Distributed Wellhead Geothermal Power Plants at Olkaria in Kenya

Clean Coal and Energy
Vol.03 No.01(2015), Article ID:14913,4 pages
10.12677/CCE.2015.31001

Optimal Selection of Vacuum System for Distributed Wellhead Geothermal Power Plants at Olkaria in Kenya

Zhengmin Cai, Xuening Li, Qiang Long, Xingcai Li, Jiwei Zhu, Yonglong He

Branch of Engineering Service, CNPC Great Wall Drilling Company, Beijing

Email: 80129348@qq.com

Received: Feb. 17th, 2015; accepted: Feb. 28th, 2015; published: Mar. 6th, 2015

Copyright © 2015 by authors and Hans Publishers Inc.

ABSTRACT

A comparative analysis on the design of vacuum system has been performed. Several schemes of design were proposed. By the comparative analysis on vacuum systems in geothermal power plants, a conclusion has been presented based on the steam parameters at Olkaria in Kenya, which provides a theoretical basis for the design of geothermal plants at this area.

Keywords:Geothermal Power Plant, Geothermal Steam, Steam Parameter, Vacuum System

Email: 80129348@qq.com

1. 引言

2. 地热电站中不凝结气的来源和组份

3. 抽真空系统的分类

4. 肯尼亚Olkaria地热蒸汽参数

5. 不同抽真空系统的对比

(1)方案一：两级射汽抽气器

Table 1. Operating parameters of NCG extractor in a single unit

Table 2. Constituent of NCGs [2]

(2) 方案二：水环真空泵

(3) 两种方案的比选

(a) 方案二的建设初投资约是方案一的两倍，但其折算电耗只有方案一的28%，考虑能耗因素后折算的20年费用现值只有方案一的38%，故方案二在经济上优势明显；

(b) 方案二设备更加紧凑，占地面积约是方案一的一半；

Table 3. Computed results for vacuum pump selection

Table 4. Comparison of two different vacuum scheme

(c) 方案二由于辅助设备少，管线安装简单，整体效果美观；

(d) 由于方案一射汽抽气器的工作蒸汽接自主蒸汽管道，因此其工作会受到主蒸汽压力的影响，运行调节较为困难，相比之下真空泵的工作更为稳定。

6. 结论

Optimal Selection of Vacuum System for Distributed Wellhead Geothermal Power Plants at Olkaria in Kenya. 清洁煤与能源,01,1-5. doi: 10.12677/CCE.2015.31001

1. 1. 王勇 (2012) 汽轮机设备及运行维护. 机械工业出版社, 北京.

2. 2. 长城钻探工程有限公司 (2014) 中国石油集团长城钻探工程有限公司肯尼亚地热发电项目4 × 3 MW井口先导试验电站可行性研究报告.