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Sour water stripping is used to remove ammonia (NH3) and hydrogen sulfide (H2S) from sour water streams coming from many operation units to condition it for discharge or reuse.1-3 In a complex refinery, most of the sour water comes from distillation, fluid catalytic cracking, catalytic reforming, coker and acid gas removal units, with many other operations contributing to the balance. The different streams are usually collected in a surge tank for centralized processing via a heat exchanger and a single stripper column, or two in series.
During oil and gas operation, water is used for many operation processes, which make water contain various contaminants depending on the sources and processes. Sour water strippers (SWS) are critical units to remove ammonia (NH3) and hydrogen sulfide (H2S) from sour water streams to condition the waters for the discharge or reuse. Different streams from various sources may induce different scale issues to cause operation productivity reduction and even equipment failure. The most common scales in sour water strippers are calcite, iron sulfite, silicates, etc. depending on the water chemistry of source streams.
This paper presents case histories of scale issues and treatment of sour water strippers with various source waters. For each case history, the specific inorganic scale problems and treatment strategies are discussed. Based on the lab testing and field application results, scale inhibitor treatment or even cleaning-up program are evaluated.
This paper provides valuable information on potential scale problems and treatment for sour water strippers with various water sources, and gives references or guideline for similar scale treatment.
This Phase II work in NH3-dominated sour waters studied the impact of several process variables including NH4HS concentration, NH3 partial pressure, H2S partial pressure, temperature, cyanide concentration, and velocity (wall shear stress).
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Several experiences with the use of titanium heat exchangers in refining processes are summarized. These involve distillation column overhead condensers in atmospheric crude distilling units, fluid catalytic cracking units, delayed coking units, and sour water strippers. The causes of problems are discussed. Needs for additional data are highlighted.