Sulfur Recovery 2018.11.7
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Question: How many common methods are there for producing sulfur from acidic gases? Answer: The production of sulfur from acidic gases generally involves three methods: partial combustion, sulfur separation, and direct oxidation; among these, the partial combustion method is commonly used in refineries. Over several decades of development, this method has given rise to many processes, such as the MCRC process, the Claus process, the ultra-Claus process, and so on.
The production of sulfur from acidic gases generally involves three methods: partial combustion, sulfur separation, and direct oxidation
Three methods: partial combustion method, sulfur separation method, and direct oxidation method
The production of sulfur from acidic gases generally involves three methods: partial combustion, sulfur separation, and direct oxidation
There are three methods for producing sulfur from acidic gases; when the hydrogen sulfide content in these gases is greater than 50%, the partial combustion method is generally used. When the hydrogen sulfide content in acidic gases is between 15% and 50%, the split-flow method is generally used; when the hydrogen sulfide content is below 15%, the partial oxidation method is usually employed
The production of sulfur from acidic gases generally involves three methods: partial combustion, sulfur separation, and direct oxidation
The production of sulfur from acidic gases generally involves three methods: partial combustion, sulfur separation, and direct oxidation, among which the partial combustion method is commonly used in refineries. Over several decades of development, this method has given rise to many processes, such as the MCRC process, the Claus process, the ultra-Claus process, and so on.
The production of sulfur from acidic gases generally involves three methods: partial combustion, sulfur separation, and direct oxidation
There are three methods: partial combustion, desulfurization, and direct oxidation, among which the partial combustion method is commonly used in refineries. Over several decades of development, this method has given rise to many processes, such as the MCRC process, the Claus process, the ultra-Claus process, and so on.
1. The partial combustion method, also known as the direct current method, straight-through method, or single-flow method, is typically used when the concentration of hydrogen sulfide in the acid gas is above 50%. The main feature is that all the acid gas, along with air added as needed, enters the combustion furnace for reaction, and then passes through a waste heat boiler and two or more catalytic conversion reactors. With this method, 60% to 70% of the sulfur is generated directly in the furnace. 2. Shunt method: This process can be used when the H2S concentration in the acid gas is below 50% but above 15%. (1) The typical flow separation process is as follows: One-third of the acid gas volume, along with the measured amount of air, enters the combustion furnace where the H2S is completely converted into SO2. This gas stream then passes through a waste heat boiler and mixes with the remaining two-thirds of the acid gas before entering the catalytic conversion reactor. In this process, sulfur is generated entirely within the catalytic section. (2) Unconventional diversion process: When the amount of acid gas entering the combustion furnace is more than 1/3, some sulfur is generated within the combustion furnace. 3. Direct oxidation method: This process can be used when the concentration of acidic gas H2S is below 5%. It is actually a new development of the Klaus prototype process. Depending on the direction of the catalytic reaction carried out by the catalyst used, the direct oxidation process can be divided into two categories. (1) Selectively catalytically oxidize H2S to sulfur. (2) Catalytically oxidize H2S to sulfur and SO2, followed by a conventional Claus catalytic section after the oxidation section.