56results about How to "Improve sulfur recovery" patented technology

Claus sulfur recovery plants that include one or more single-stage or multi-stage compact tubular Claus catalytic reactor-heat exchanger units are disclosed. In some instances, these new or improved Claus plants additionally include one or more compact heat exchanger containing cooling tubes that are filled with a heat transfer enhancement medium. The new compact tubular Claus catalytic reactor-heat exchanger units and HTEM-containing heat exchangers are also disclosed. A process for recovering sulfur from a hydrogen sulfide-containing gas stream, employing the new tubular Claus catalytic reactor-heat exchanger unit, and in some instances a HTEM-containing heat exchanger, are also disclosed.

The invention discloses a comprehensive multi-gas source low-concentration SO2 fume recycling acid-making technological process. The fume is mixed in a pressure adjusting gas distribution mode, is subjected to washing by using a high-efficiency washer and deep purification by using a combined purification tower, and is subsequently fed into a fume desulfurization system, and the tail gas is fed into a chimney to discharge out. The high-concentration SO2 which is produced from desulfuration and desorption is diluted by air or a part of pre-washed wet fume and is fed into an acid-making system, a finished product sulfuric acid is produced, the sulfuric acid tail gas is fed back to the combined purification tower and the fume desulfurization system, and the tail gas is discharged out when being subjected to up-to-standard desulfurization. The process is a comprehensive sulfur resource recycling technique that a multi-gas source mixed conveying technique, an SO2 recycling technique which employs an absorption-desorption method and a conversion-absorption acid-making technique are combined together, has the characteristics of high sulfur recycling rate, optimization in equipment and investment and low operation expense, can realize clean production and comprehensive recycling of SO2, prompts the development of circular economy of companies, and can be widely applied to comprehensive treatment on fume with low-concentration SO2 in industries of colored metal, steel and iron, thermal power, chemistry and the like.

The invention is concerned with a method to remove sulfur dioxide of gas and smoke through bio-trickling filter tower with bamboo-carbon filler. The nutrient source spray on the filling inside the tower form the top of bio-trickling filter tower and run into the filling from up to down and enter the circulation gutter on the bottom of tower, then go back to the top of tower by circulation gutter. Meanwhile the gas and smoke with sulfur dioxide enter form the bottom of tower, during the rising process, it is cleaned by the bio-film with fixed desulfuration bacteria and discharged form the top of tower. The filling is the pretreatment bamboo-carbon and it is fit for getting Ferrous Sulfate desulfuration byproduct. The bamboo-carbon owns developed holes and strong adsorption ability to form steady and high active bio-film and to remove the sulfur dioxide. It has wide application future to callback sulfur with low cost.

The invention relates to a high-sulfur power raw coal sorting process which comprises the following steps of: separating high-sulfur power raw coal into 100(50)-13(6) mm lump raw coal and 13(6)-0 mm power raw coal; leading the 100(50)-13(6) mm lump raw coal into a lump coal heavy medium shallow slot sorting system to discharge washed fine coal and gangue; leading the 13(6)-0 mm power raw coal into a heavy medium cyclone sorting system for sorting to discharge washed power fine coal and gangue; leading the gangue produced by both the lump coal heavy medium shallow slot sorting system and the heavy medium cyclone sorting system to enter an autogenous medium cyclone gangue sorting system for sorting to discharge ferric disulfide and electric coal, and simultaneously diverting fine ferric disulfide as a supplementary medium of the lump coal heavy medium shallow slot sorting system and the heavy medium cyclone sorting system; and finally processing the products of washed power fine coal, washed lump fine coal, ferric disulfide, electric coal and the like. The sorting system provided by the invention has simplified links, small floor space and low operating cost, the investment and operating cost of the whole factory is reduced by 15-20%; and meanwhile, the sorting system has good desulfurization property and obvious energy saving and emission reduction effects.

The invention discloses a method for joint production of sulfuric acid and refined iron powder by mixed burning of ferrous sulfate and pyrite and belongs to the technical field of environmental protection. The method comprises the following steps of: preparing ferrous sulfate monohydrate from ferrous sulfate heptahydrate by high-temperature crystal transformation, filtration and drying; drying and then feeding to drying equipment for free water removal together with ferrous sulfate monohydrate which is separated by concentrating waste acids from titanium dioxide production; drying and then feeding the mixture of ferrous sulfate monohydrate, pyrite and solid sulfur to a circulating fluid bed decomposition furnace; and introducing primary and secondary air for cyclic thermal decomposition. The high-temperature sulfur dioxide-containing flue gas discharged from the top of the circulating fluid bed decomposition furnace is subjected to cooling and dedusting treatment by a waste heat boiler, a cyclone dust collector and an electric dust collector and then fed into a dilute acid washing and purifying system and a double-transformation double-suction acid making system to produce sulfuric acid. The refined iron powder discharged from the circulating fluid bed decomposition furnace and the refined iron powder collected by the waste heat boiler, the cyclone dust collector and the electric dust collector, which have a thermal state w (Fe) of more than or equal to 60%, are cooled by a hot-material cooler and then fed into a refined iron powder bin. The method has good environmental and social benefits.

The invention discloses a biogas desulfurization method in series of a wet method with a dry method, which comprises the following steps: crude gas is boosted by a fan and enters a wet desulphurization tower after the temperature is lowered by a cooling tower; in the countercurrent contact process of crude gas and a desulfurization solution in the tower and a catalyst, most of impurities such as hydrogen sulfide are removed, and then the biogas is subjected to the dry desulfurization again after the moisture is separated through a dehydrating tower to further remove hydrogen sulfide so as to be lowered below 15 mg/Nm<3> to enter a biogas cabinet for use, and a rich fluid containing H2S is recycled in a regeneration tank. The method disclosed by the invention has the advantages of large treatment amount, stable treatment effect, high sulfur recovery rate, easily regenerated desulfurizer and long service life, and ensures that the hydrogen sulfide content of biogas meets the use requirements. The service life of the equipment pipeline in the biogas industrial application can be prolonged, the environmental problem of secondary pollution in use of biogas is eliminated, and a guarantee for further purifying and utilizing biogas is provided.

In a process and system for recovering sulfur from a process gas stream initially comprising a hydrogen sulfide containing gas and an oxygen containing gas, a control process and system respectively are provided. The sulfur recovery process includes a thermal step having a beginning followed by a catalytic step having an end. The control process includes first analyzing a composition of the process gas stream at a first location between the beginning of the thermal step and the end of the catalytic step, first controlling the oxygen containing gas having regard to that first composition, second analyzing the composition of the process gas stream at a second location downstream of the end of the catalytic step, and second controlling the oxygen containing gas having regard to that second composition. The sulfur recovery system and control system therefor are provided for performing the steps of the sulfur recovery process and control process respectively.

The invention belongs to the field of sulfur recovery, and particularly relates to an SWSR-8 pressurization sulfur recovery process. The process comprises the steps that acid gas enters a sulfur making furnace, H2S is subjected to a high-temperature Claus reaction and converted into sulfur, and sulfur enters a two-stage converter to conduct two stage catalytic conversion for recovering sulfur; sulfur making tail gas enters a hydrogenation reactor, under the action of a hydrogenation catalyst, SO2 and COS are reduced to H2S through hydrogenation hydrolysis, reduced H2S gas is absorbed with an MDEA solution, and after purified tail gas recovers heat through incineration, flue gas is exhausted to the atmosphere through a chimney, wherein the pressure of acid gas entering the sulfur making furnace ranges from 90 kPa(g) to 120 kPa(g), and the pressure of the sulfur making furnace ranges from 90m kPa(g) to 120 kPa(g). The pressure of cooling and heat exchange equipment such as a sulfur making waste heat furnace, a first stage sulfur condenser, a second stage sulfur condenser, a third stage sulfur condenser, a steam generator and a tail gas waste heat boiler is higher than that in the prior art, the total heat transfer coefficient is increased, the occupied area is decreased, catalytic and absorption reactions can be conducted conveniently, the sulfur recovery rate is increased, and SO2 discharge is reduced.

The invention belongs to the technical field of industrial sulfur recovery and specifically relates to a device for recovering sulfur by treating low-concentration acid gases and a process for recovering sulfur from low-concentration acid gases based on the device. The device for recovering sulfur by treating low-concentration acid gases is used for recovering and treating the acid gases through asulfur production unit, a tail gas treatment unit, a flue gas purification unit and a liquid sulfur degassing unit, and a catalyst in each stage of reactor is reasonably graded, so that the sulfur recovery rate of the overall recovery device is effectively increased; and by using the device for recovering sulfur, provided by the invention, the flue gas SO2 emission concentration can be stably lower than 20 mg/m<3> and even lower than 10 mg/m<3>, so that the flue gas SO2 emission concentration is greatly reduced.

Processes for the thermal reduction of sulfur dioxide to elemental sulfur are described and disclosed. The processes described include three general reaction sections, including the reaction furnace portion where the SO₂-containing stream is combusted, the hydrogenation portion wherein the effluent from the reaction furnace is hydrogenated over an appropriate catalyst, and a Claus conversion portion, wherein residual H₂S and SO₂ are further reacted to produce additional elemental sulfur.

A method for recovering sulfur from an acid gas feed is provided. The method comprising the steps of mixing the acid gas feed and an absorption process outlet stream to form a combined Claus feed, introducing the combined Claus feed and a sulfur dioxide enriched air feed to a Claus process to produce a Claus outlet gas stream, introducing the Claus outlet gas stream to a thermal oxidizer, treating the thermal oxidizer outlet stream in a gas treatment unit to produce a dehydrated stream, introducing the dehydrated stream to a membrane sweeping unit to produce a sweep membrane residue stream and a sulfur dioxide enriched air feed, introducing a sweep air stream to a permeate side of the membrane sweeping unit, and introducing the sweep membrane residue stream to a sulfur dioxide absorption process to produce the absorption process outlet stream and a stack feed.

The invention discloses a sulfur recovering heat utilization device and method. The device comprises a steam air cooler, a condensed water recovery tank and a condensed water pump which are connected with one another in sequence, wherein the steam air cooler is connected with a steam pipeline of all stages of sulfur condensate coolers through a pipeline, and a height difference exists between a condensed water outlet of the steam air cooler and an inlet of the condensed water recovery tank; a pressure-regulating emptying pipeline is arranged at the tank top of the condensed water recovery tank, and the condensed water recovery tank is connected with various water traps of the sulfur recovery device through the pipeline and is also in water supply connection with a low-pressure boiler of a plant system through a water replenishing pipeline; the condensed water pump is connected with a water pipeline on all the stages of sulfur condensate coolers through the pipeline. The sulfur recovering heat utilization device and the method have the benefits that a part of heat in the sulfur recovery process is effectively taken away by utilizing a steam-condensed water self-circulating system, limitation on the specification of the plant steam system is avoided, and the outlet temperature of the sulfur condensate coolers is further reduced, so that the total sulfur recovery rate is further effectively improved.

The invention provides a desulfurization waste liquid acid making system and method, which relate to the field of acid making. The system comprises a pretreatment unit, a concentration unit, a pulpingunit, an incineration unit, a purification unit and a dry absorption conversion unit, wherein a dilute sulfuric acid outlet in the purification unit is connected with a filtrate storage tank for storing filtrate in the pretreatment unit. The acid making method comprises a pretreatment step for separating the desulfurization waste liquid from the desulfurization unit into a sulfur paste and a filtrate, a concentration step for concentrating the filtrate to obtain a concentrated solution, a pulping step for mixing the sulfur paste and the concentrated solution into a slurry, an incineration step for incinerating the slurry to produce SO2 gas, a purification step for washing the SO2 gas, and a dry absorption conversion step for preparing concentrated sulfuric acid from the purified SO2 gas.Dilute sulfuric acid generated in the purification step is returned to the filtrate to be neutralized. According to the method, dilute sulfuric acid and ammonia contained in the filtrate are directlysubjected to a neutralization reaction, the raw material SO2 is further obtained through incineration, and the sulfur recovery rate and the concentrated sulfuric acid yield are increased.

The invention discloses a system and method for removing H2S in liquid sulfur. The system for removing H2S in liquid sulfur comprises a liquid sulfur tank, a liquid sulfur pump, a liquid sulfur cooler, a liquid sulfur spray head, gas stirrers, a product liquid sulfur pump and a waste gas booster fan; liquid sulfur is stored in the liquid sulfur tank; the liquid sulfur pump is connected to the bottom of the liquid sulfur tank to pump liquid sulfur out of the liquid sulfur tank; the liquid sulfur cooler is connected with the liquid sulfur pump, and liquid sulfur pumped by the liquid sulfur pump is cooled in the liquid sulfur cooler; the liquid sulfur spray head is connected with the liquid sulfur cooler, and liquid sulfur cooled by the liquid sulfur cooler is sprayed back to the liquid sulfur tank through the liquid sulfur spray head; the gas stirrers are arranged in the liquid sulfur tank and used for stirring and conducting steam stripping on liquid sulfur in the liquid sulfur tank; the product liquid sulfur pump is connected to the bottom of the liquid sulfur tank, liquid sulfur in which H2S is removed is delivered to a granulation unit through the product liquid sulfur pump; the waste gas booster fan is arranged above the liquid sulfur tank and delivers waste gas to a sulfur production unit.

The invention provides a desulfurization process of generator gas, comprising the following step: the generator gas containing sulfur is absorbed by a desulfurization solution containing a mimosa extract in a desulfurization tower; the process is characterized in that the desulfurization solution also comprises vanadium pentoxide; and the sulfur content of the generator gas is 1500-2500mg/Nm<3>. The process is suitable for a situation that the content of H2S in the gas is high. The method has high desulfurization rate and the sulfur content of the gas coming out of the tower is not more than 150mg/Nm<3>.

The invention relates to a filling method for sulfur recycled catalyst with a high content of CO2 in a raw material gas to be treated, which belongs to the method of preparing sulfur from a sulfur compound in a gaseous state of sulfides in the gaseous state. By the adoption of a two-stage sulfur preparation and conversion process, multi-functional sulfur recycled catalyst with high hydrolysis activity of organic sulfur is filled at the height from one thirds to a half in the upper part of the first-stage converter, and alumina base sulfur recycled catalyst with a large ratio surface is filled at the height from two thirds to a half in the lower part of the first-stage converter; the second-stage converter is totally filled with alumina base sulfur recycled catalyst with the large ratio surface. According to the filling method for sulfur recycled catalyst with the high content of CO2 in the raw material gas to be treated, the hydrolysis activity of sulfur is increased, and the Claus activity can be maintained high, the gas volume of CO2 in the raw material gas to be treated is as high as 50 percent, the total sulfur conversion rate of the sulfur recycle device can reach above 96 percent, and the service life of the catalyst can reach more than six years. The filling method provided by the invention is suitable for the sulfur recycling devices of facilities in petroleum refining and production, coal chemical industry and natural gas purifying.

The invention belongs to the technical field of gas purification, and particularly relates to a complexing iron desulfurizing agent for Claus tail gas treatment, wherein the complexing iron desulfurizing agent comprises the following components: a soluble iron salt, a soluble cerium salt, a chelating agent, an inorganic alkali, an organic additive and water, wherein the weight percentage of the iron ions is 0.5-5% wt, a molar ratio of Fe<3+> to Fe<2+> is 0.5-5.0, the weight percentage of the cerium ions is 0.1-0.5% wt, a molar ratio of the cations to the iron ions in the inorganic alkali is 0.5-1.0, a molar ratio of the chelating agent to the sum of the iron ions and the cerium ions is 1.0-3.5, and the weight percentage of the organic additive is 0.2-2 wt%. The desulfurizing agent can simultaneously remove hydrogen sulfide and carbonyl sulfide in Claus tail gas, wherein the content of the hydrogen sulfide in the purified tail gas after desulfurization is smaller than 10 mg/m<3>, and the content of the carbonyl sulfide in the purified tail gas after desulfurization is smaller than 20 mg/m<3>, so that the national environmental protection standard requirement is met, the cost is low,the desulfurizing agent activity is high, and the desulfurizing effect is good.

The invention discloses a method for recycling zinc-oxygen pressure leaching sulfur flotation tailings. According to the method for recycling the zinc-oxygen pressure leaching sulfur flotation tailings, one-stage roughing, one-stage concentration and two-stage scavenging are carried out again on the flotation tailings to obtain sulfur-containing concentrate and tailings, then size fraction screening is carried out on the tailings to obtain oversize products and undersize products, the oversize products are mainly gold-enriched slag, and the undersize products are mainly silver-enriched slag. Effective separation of sulfur, gold and silver is achieved through combination of reagent flotation and size fraction screening; and the problems that the oxygen pressure leaching sulfur flotation tailings are high in sulfur content, low in gold and silver content and incapable of being recycled are solved, so that the oxygen pressure leaching sulfur flotation tailings are recycled, and the methodfor recycling the zinc-oxygen pressure leaching sulfur flotation tailings has the advantages that the sulfur content is reduced, and the gold, silver and sulfur separation is achieved.

The invention belongs to the technical field of sulfur recovery, and particularly relates to a hydrogen sulfide selective oxidation catalyst and a preparation method thereof, wherein the raw materialsof the carrier comprise metatitanic acid, silica powder and calcium silicate, iron oxide and calcium oxide are used as active components, and the silica powder is fumed silica powder having a specific surface area of 40-60 m<2>/g. According to the present invention, by using the carrier of the invention, the catalyst can have a suitable pore structure, the Claus reverse reaction of the catalyst at the selective oxidation stage can be avoided, and the sensitivity of the catalyst to water vapor and the oxygen content can be reduced; the catalyst has characteristics of high activity, insensitivity to water vapor and oxygen content in the process gas, high side pressure and high H2S conversion rate; and by using the catalyst, the hydrogen sulfide conversion rate can reach more than 95%, the sulfur yield can reach more than 90%, and the side pressure strength can reach more than 120 N/cm so as to improve the sulfur recovery rate of the sulfur recovery device and achieve the significant economic and social benefits.

The invention provides a method for separating each component ore in a pyrite-ion adsorption type rare earth complex ore. The method comprises the following steps: grinding a raw ore until an 80-mesh ore accounts for 30-60% of the weight of the raw ore, adding into water according to a liquid-solid mass ratio of 0.8-1.5, uniformly stirring, then adding hydrogen peroxide which accounts for 0.6-0.9% of the weight of the raw ore, uniformly stirring, then adjusting the pH value of slurry to be 4.0-4.6 by adding dilute ammonia water, and uniformly stirring to obtain ore pulp; and performing solid-liquid separation on the obtained ore pulp to obtain a rare earth leaching liquid and a solid phase containing pyrite and clay minerals, then purifying the rare earth leaching liquid to prepare a rare earth compound, and performing flotation on the solid phase to obtain pyrite and the clay minerals. The method provided by the invention successfully achieves the comprehensive recycling of rare earth, pyrite and the clay minerals by adopting water as an initial leaching agent, also is simple in process and easy to operate, does not need to use ammonium sulfate chemical products in a leaching process, also can be used for producing agricultural ammonium sulfate as a by-product, and is environment-friendly.