Removing hydrogen sulfide from sour gas and regasification of liquefied natural gas.
Petroleum refining refers to the many processes used to convert crude oil into useful products such as liquefied petroleum gas (LPG), gasoline, kerosene, jet fuel, diesel oil and fuel oils. Each refinery is unique, using various processes based on their location, products produced and economic considerations.
Among the numerous refinery applications, Hoffman and Lamson centrifugal blowers are often used to produce air or vacuum. Some common applications include sulfur recovery, thermal oxidation and LNG regasification.
Sulfur recovery involves the removal of gases that contain hydrogen sulfide (H2S), often called “sour gas”. H2S is toxic and complicates the metal piping and equipment exposed to sour gas. The removal process is called “sweetening” the gas, since removing H2S also removes the foul odor. The byproduct of removing hydrogen sulfide is sulfur. Sulfur recovery designs vary somewhat, but the most common need for a Hoffman and Lamson centrifugal blower is for combustion air, feeding the reaction furnace. Frequently, an additional multistage blower is utilized to recycle already processed gas back through the process to increase the sulfur yield and/or decrease hydrogen sulfide content. In a thermal oxidizing application, an additional Hoffman and Lamson combustion air blower is occasionally used to enhance combustion of “tail gases” in a tail gas incinerator to further clean the gases before sending them to the smokestack. Finally, blowers are sometimes used to propel the exhaust up the stack, but fans are far more common.
Hoffman™ and Lamson™ Products
Various 12” to 24” models of Hoffman and Lamson multistage centrifugal blowers are typical offerings for these Combustion Air blowers. API 617 Spec Compliance is often required. These blowers are usually specified “copper free” due to the hydrogen sulfide. The Sour Gas Recycle blowers are usually smaller, 8” to 12” and will pass sour gas through and will need steel internals and gas seals, carbon ring or purged labyrinth. The recycle blower also has inlet temperatures of 140 ˚F to 300 ˚F and may require bearing shields. Although incinerator blowers require lower pressure capabilities, these blowers are also usually 12” to 24” inlet size. Since condensate can build-up, a section drain pipe assembly is recommended for convenience.
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Petroleum Refining Products