Unix Engineering LLC has successfully mastered and is now ready to implement EP/EPC projects in the Russian Federation related to the construction of plants for the production of elemental sulfur using the Klaus method.
Unix Engineering LLC, together with our Chinese partner and a Russian design institute, has developed the Claus process for cleaning gas from hydrogen sulfide based on the specified initial data and required process parameters in accordance with the Customers technical specifications. Technical specialists have defined and agreed with the Customer a three-stage Claus method with an incineration unit as the most optimal option based on capital costs and the required conversion (98% for hydrogen sulfide).
Our consortium has extensive experience in designing these plants, in supplying equipment (including our own production) and catalysts of our own design. In particular, over the past 25 years, our Chinese partner has successfully implemented about 65 projects for the construction of sulfur production plants using the Claus method (various modifications) in China, including those with similar production volumes, with equipment and structures in a block-modular design and at oil production fields. The partner, the developer of design documentation, has many years of experience in developing documentation for PD, RD, Feasibility Studies, technical support for projects in the field of oil refining and petrochemistry in the EAEU, including in the design of sulfur plants and block-modular type plants.
Description
Sulfur production technology using the Claus process combined with ammonia washing is a technology that is primarily used in sulfur recovery plants in the coal chemical and petrochemical industries. Typically, the volume concentration of H2S in the raw acid gas is more than 20% vol., and the pressure of the raw gas is not less than 0.1 MPa (g). The problem of purifying tail gases from the Claus process from SO2 and other sulfur-containing compounds is very important worldwide from an environmental point of view. In order to reduce emissions of pollutants, as well as obtain new components or additional extraction of the target product, ammonia washing can be used. After cleaning the exhaust gases from the Claus plant using ammonia washing (ammonia desulfurization), fertilizers based on ammonium sulfate can be obtained, which is formed as a by-product, and at the same time the amount of SO2 emissions into the atmosphere is achieved less than 50 mg/Nm3.
Brief description of technology
The acid gas enters the elemental sulfur production plant, the Claus process, first to the thermal stage, then to the catalytic stage in a two- or three-stage reactor. About 93%~97% of the sulfur components of the acid gas are converted into sulfur, and the tail gas of the Claus plant after afterburning is sent to the scrubber for countercurrent contact with ammonia to form a (NH3)2SO4 solution, which is sent to the steam boiler beyond the boundary of the sulfur recovery unit. Gas from the top of the scrubber tower can be discharged directly into the atmosphere without additional treatment.
Features of the process
-SO2 emissions into the atmosphere less than 50 mg/nm3
-Developed process (more than 100 operating units)
-Minimal financial investments and energy consumption
-Simple, safe and reliable production operation
Description
The problem of cleaning the tail (waste) gases of the Claus process from SO2 and other
sulfur-containing compounds is very important all over the world from an environmental point of view. In order to reduce emissions of pollutants into the atmosphere, absorption methods for tail gas purification can be used. Tail gas hydrotreating technology using absorption (tail gas treatment unit) and absorbent regeneration at the Claus unit is mainly used in large installations for the recovery of sulfur from natural gas and petroleum chemicals. Typically, the volume concentration of H2S in acid gas is more than 20% vol., and the pressure of the supplied gas is not less than 0.1 MPa(g). After the gas passes through the two-stage Claus reactor, the tail gas is hydrogenated and then absorbed into the MDEA solution, resulting in a sulfur recovery rate of more than 99.8% and SO2 emissions to the atmosphere of less than 200 mg/Nm3.
Brief description of technology
The acid gas first enters the thermal section of the process, the furnace, then some of the sulfur is recovered using the catalytic stage of the process, which is a two-stage Claus reactor, and then the gas passes through a hydrogenation reactor to convert all the remaining sulfur-containing components and sulfur elements
gas to hydrogen sulfide, and the tail gas containing hydrogen sulfide is sent to a quench column, where the acidic condensate is separated, and after cooling, the stream enters an absorber with
MDEA solvent, which counter currently absorbs H2S in the gas, and then the saturated amine solution is sent for regeneration, from where additional amounts of hydrogen sulfide are evaporated, which is returned to the process, and the regenerated amine is returned to the absorber. Gas from the top of the absorption tower is burned and released directly into the atmosphere.
Process features
-High degree of sulfur recovery (about 99.8%)
-SO2 emissions are less than 200 mg/Nm3
-Mastered process (more than 30 operating units)
-No by-products
