11 results about "Claus process" patented technology

The invention relates to the technical field of preparation of elemental sulfur, and particularly discloses a solvent method for preparing elemental sulfur from hydrogen sulfide and sulfur dioxide. According to the solvent method, hydrogen sulfide and sulfur dioxide are introduced into a mixed solution of 2-acetylthiophene and 2-phenylthiophene at the temperature of 120-150 DEG C for a neutralization reaction, and elemental sulfur is generated. According to the invention, a mixed solution of liquid 2-acetylthiophene and 2-phenylthiophene is used as a reaction medium, and hydrogen sulfide and sulfur dioxide react to generate sulfur and water. The carbonyl oxygen atom of the 2-acetylthiophene and the sulfur atom on the thiophene ring have certain electron donating ability, and have certain catalytic action on the reaction. The 2-phenylthiophene is high in boiling point, stable in property and capable of well dispersing and conveying the liquid sulfur, and after standing, a mixed solution of the 2-acetylthiophene and the 2-phenylthiophene is easily layered from the liquid sulfur, so that the elemental sulfur is easily separated out. Compared with a traditional Claus process, the solvent method in the scheme has the advantages that the solvent is used as a reaction medium, and the problem of sulfur blockage is not easily generated.

Disclosed in the present invention is a novel Claus system for recovering sulfur from acid gas, comprising an acid gas combustion subsystem, a combustion advanced analysis and control subsystem and a conversion subsystem. The acid gas combustion subsystem comprises a sulfur-producing combustion furnace. The combustion advanced analysis and control subsystem is used for monitoring the flow rates of acid gas, process tail gas and air in real time, monitoring the concentration parameters of components in the acid gas and the process tail gas as well as the temperature parameter of a burner of the sulfur-producing combustion furnace, controlling the flow rate of air entering the burner, and controlling the proportions of the acid gas entering the burner, a hearth of the sulfur-producing combustion furnace as well as the conversion subsystem, so as to control the temperature of the burner of the combustion furnace to be within a preset range, and control the proportion of H2S and SO2 in the gas entering the conversion subsystem to reach a preset value 2:1. The conversion subsystem is used for carrying out a low-temperature catalytic reaction on high-temperature process gas discharged from the sulfur-producing combustion furnace, so as to generate elemental sulfur. By means of the technical optimization of the Claus process itself, the present invention improves the sulfur recovery rate, and further matching with a reasonable tail gas treatment process will reduce the costs and production energy consumption of sulfur recovery devices to a certain extent, thus improving the yield of sulfur.

Sulfur-containing compounds are removed from crude CO2 by conversion to elemental sulfur in a Claus process and subsequently by hydrogenation of the Claus tail gas to convert residual sulfur-containing compounds into H2S which, after cooling to knock out water and then compressing, is removed, together with any other sulfur-containing impurities, either by physical separation or by chemical reaction with a solid metal oxide to form solid metal sulfide with subsequent oxidative regeneration to produce purified CO2 and a recycle gas comprising at least one sulfur-containing compound which is recycled to the Claus process. Some H2S in the Claus tail gas may be removed initially by selective and / or non-selective amine absorption(s) in a tail gas treatment unit prior to removal of residual H2S and any other residual sulfur-containing impurities by the physical separation or the chemical reaction steps.

This invention provides a method for preparing hydrogen and sulfur from solid waste gypsum through reduction and acidification in a cement kiln, relating to the field of solid waste disposal technology. The method involves targeted local modifications to a novel dry-process cement clinker rotary kiln production system. Using desulfurized gypsum, phosphogypsum, and other solid waste gypsum as raw materials, the gypsum is crushed, ground, preheated, and dehydrated. Then, it is calcined in a modified three-lobe gravity semi-suspended rotary kiln at 800–1100℃ in a reducing atmosphere to generate high-purity calcium sulfide. After sealed cooling, the calcium sulfide reacts with byproduct hydrochloric acid to produce high-purity hydrogen sulfide. The hydrogen sulfide is then used to co-produce hydrogen and sulfur via a medium-assisted electrochemical decomposition method, or high-purity sulfur can be directly prepared using the Claus process. This invention achieves full resource utilization of solid waste gypsum using existing cement kiln equipment, requires minimal modification, has low investment costs, and enables the cascade utilization of CO waste gas and kiln waste heat, reducing overall energy consumption by more than 30% compared to traditional processes.

A method of processing an acid gas is provided. The method includes: receiving, in a sulfur recovery unit (SRU), an acid gas including hydrogen sulfide (H2S) and carbon dioxide (CO2); performing, in the SRU, a Claus process to treat the acid gas, generating elemental sulfur and a tail gas including the CO2 and hydrogen (H2); compressing the tail gas; cooling the compressed tail gas; receiving water (H2O) in a column; receiving the cool compressed tail gas in the column; maintaining, while receiving the cool compressed tail gas in the column, a pressure and a temperature inside the column such that the cool compressed tail gas reacts with the H2O to form a gas hydrate including the CO2 and the H2O in the column and forms a product gas including the H2; and recovering the product gas from the column.

The invention discloses a Claus sulfur recovery method which comprises the following steps: enabling acid gas generated by an upstream device and air from a main fan to enter an acid gas combustion furnace together for combustion; high-temperature process gas discharged from an acid gas combustion furnace is cooled by a waste heat boiler and then mixed with SO2 returned by a tail gas device, the mixture is subjected to first sulfur separation and remixed and then enters a first-stage reactor, the inlet temperature of the first-stage reactor is 220 DEG C, and the temperature of a catalyst bed layer of the first-stage reactor is 250-300 DEG C; the process gas discharged from the first-stage reactor is subjected to heat exchange, secondary sulfur separation and remixing and then enters a second-stage reactor, the inlet temperature of the second-stage reactor is 170 DEG C, and the temperature of a catalyst bed layer of the first-stage reactor is 160-200 DEG C. According to the method, heat loss caused by heat exchange of conventional Claus can be effectively reduced, the technological process is reduced, so that energy consumption loss is reduced, temperature control is simplified, it is guaranteed that the sulfur yield reaches 95% or above, and meanwhile it is guaranteed that SO2 reaches the standard and is discharged.

The invention relates to a method for enhancing Claus tail gas treatment using sulfur dioxide selective membrane technology, in particular to a method for improving sulfur recovery in an acid gas feed, comprising the steps of: introducing the acid gas feed and a sulfur dioxide-rich air stream into a Claus process to produce a product gas stream, introducing the product gas stream into a thermal oxidizer to produce a flue gas stream, cooling the flue gas stream to produce a cooled exhaust stream; separating the cooled exhaust stream into a saturated gas stream, heating the saturated gas stream to produce a film gas stream; the method includes introducing a membrane gas stream into a membrane purge unit, the membrane purge unit including a membrane, sulfur dioxide in the membrane gas stream permeating the membrane of the membrane purge unit, introducing a purge air stream, the purge air stream collecting sulfur dioxide to produce a sulfur dioxide rich air stream.

The invention discloses a sulfur-containing tail gas emission reduction system and method for a low-temperature Claus sulfur recovery device. The sulfur-containing tail gas emission reduction system comprises an incinerator connected to a tail gas exhaust port of the low-temperature Claus sulfur recovery device. The gas outlet end of the incinerator is connected with two oxidation catalytic reactors which are arranged in parallel, and outlets of the two oxidation catalytic reactors are respectively connected with a primary Claus reactor and a purified flue gas outlet of the low-temperature Claus sulfur recovery device through pipelines; the oxidation catalytic reactor is also connected with a reducing gas source; incinerator tail gas is introduced into one oxidation catalytic reactor to be in an oxidation adsorption state; and reducing gas is introduced into the other oxidation catalytic reactor to be in a reduction regeneration state. According to the sulfur tail gas emission reduction system and method, the flue gas sulfur dioxide emission concentration in the production process of low-temperature Claus processes such as CBA, CPS and MCRC sulfur recovery devices can be smaller than 50 mg / m < 3 > and is far lower than the lowest limit value of 400 mg / m < 3 > required by the national standard in the natural gas industry.

The application discloses a kind of for acid gas sulfur recovery claus system, comprising: acid gas combustion subsystem, combustion advanced analysis control subsystem, conversion subsystem;Acid gas combustion subsystem includes sulfur-making combustion furnace;Combustion advanced analysis control subsystem is used to monitor the flow of acid gas, process tail gas and air in real time, monitor the concentration parameters of component in acid gas, process tail gas and the temperature parameters of sulfur-making combustion furnace burner, control the air flow entering burner, control the proportion of acid gas entering the burner, hearth and conversion subsystem of sulfur-making combustion furnace, so as to control the temperature of combustion furnace burner in preset range, and control the proportion of H2S and SO2 in the gas entering conversion subsystem reaches preset value 2:1;Conversion subsystem is used to generate elemental sulfur by low-temperature catalytic reaction to high-temperature process gas out of sulfur-making combustion furnace.This application improves the sulfur recovery rate by optimizing the technology of claus process itself, while matching reasonable tail gas treatment process, which will reduce the cost and production energy consumption of sulfur recovery unit to some extent, improve sulfur output.

The application discloses a short-process Claus desulfurization and sulfur recovery process coupled with low-temperature catalytic oxidation. After a waste gas containing H2S passes through a first-stage Claus conversion reactor and a condenser, the waste gas directly enters a catalytic oxidation reactor with carbon material or carbon-supported metal as a catalyst. The low-temperature catalytic oxidation activity of the carbon material or the carbon-supported metal is utilized to completely convert low-concentration H2S into sulfur at a low temperature and recover the sulfur. Compared with a traditional Claus process, the process route only needs a first-stage Claus reaction and a low-temperature catalytic oxidation reaction, and does not need multiple Claus conversion reactors and multiple reheating-condensation cycles, so that complete removal of H2S in the sulfur-containing waste gas and sulfur recovery can be realized, and the process route has the advantages of short process, low system complexity and low energy consumption.

The invention provides a method for efficiently recovering lead from lead sulfate slag, and belongs to the technical field of non-ferrous metal recovery and waste treatment. The method comprises the steps that the lead sulfate slag is pretreated, then obtained powder is added into a plasma-molten salt synergistic reactor containing chloride-based molten salt, under the synergistic effect of a hydrogen-containing atmosphere, plasma activation and a direct-current electric field, lead sulfate is reduced into liquid metal lead, and meanwhile sulfur is converted into hydrogen sulfide; and finally, respectively collecting liquid lead and elemental sulfur obtained through Claus process treatment. According to the method, efficient and high-valued recovery of lead and sulfur is achieved, the lead recovery rate is not lower than 98%, the purity is not lower than 99.8%, the sulfur recovery purity is not lower than 99.9%, no SO2 is discharged in the whole process, no secondary pollutants such as high-salinity wastewater and sulfur-containing waste residues are generated, energy consumption is low, and the method is a clean and efficient new resource utilization method.