双反应器选择性氧化硫回收工艺改进与优化

摘要陕西某天然气净化厂采用干法双反应器选择性氧化硫回收工艺，该硫磺回收装置自2016年1月投产以来，存在等温反应器床层热点温度>300℃、硫磺夹带严重等问题，造成焚烧后φ（SO₂）偏高。通过对运行数据分析，结合实验室评价和模拟计算，确定汽包管路的不对称性分布为热点温度高的主因，硫分离器内流速低于设计值为硫磺夹带的主因，并提出汽包管路均布、降低硫分离器内件流通面积及增加在线仪表蒸汽吹扫等改进措施，使得装置运行平稳，热点温度降低至300℃以下，硫磺收率增加，外排SO₂降低至4 000 mg/m³（标准状态，下同）以下。

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	翟瑞国
	党晓峰
	夏勇
	黄昌猛
	陈星
	吕静

关键词：选择性氧化硫回收热点温度硫磺夹带

Abstract： A natural gas purification plant with sulfur recovery unit in Shan'xi province which using H₂S selective oxidation technology was put into operation in January 2016. Some problems such as hot spot temperature higher than 300℃ in isothermal reactor and sulfur entrainment from separator were detected, resulting in high concentration of SO₂ in flue gas. Through operation data analyzing, and combining laboratory experiment and simulation, the asymmetry distribution of the reactor boiler's steam pipe is determined as the main reason of the high temperature hot spot. The gas velocity in the sulfur separator is lower than the design value which lead to more sulfur entrainment. Targeted modification to the unit were conducted to make the plant running more stable, including uniform distributing reactor boiler's steam pipe, increasing the gas velocity in sulfur separator by decrease internal's area. The results showed lower hot spot temperature (<300℃), higher yield of sulfur recovery, and decreasing of SO₂ concentration to lower than 4 000 mg/Nm³ in flue gas.

Keywords： selective oxidation； sulfur recovery； hot spots； sulfur entrainment

Received 2018-10-29;

Corresponding Authors: 吕静,E-mail:muddylj@tju.edu.cn。 Email: muddylj@tju.edu.cn

About author: 翟瑞国(1986-),男,工程师,研究方向为硫回收工艺优化与模拟。

引用本文:

翟瑞国, 党晓峰, 夏勇, 黄昌猛, 陈星, 吕静.双反应器选择性氧化硫回收工艺改进与优化[J]. 化学工业与工程, 2019,36(5): 17-24

Zhai Ruiguo, Dang Xiaofeng, Xia Yong, Huang Changmeng, Chen Xing, Lv Jing.Improvement and Optimization of Two Reactor H₂S Selective Oxidative in Sulfur Recovery Process[J]. Chemcial Industry and Engineering, 2019,36(5): 17-24

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