Improved cleaning from sulfur dioxide

FIELD: chemistry.

SUBSTANCE: method includes providing the off-gas of the melting furnace, separating sulfur dioxide from the exhaust gas to produce concentrated sulfur dioxide and exhaust gas for venting, mixing the concentrated sulfur dioxide with the fuel gas, heating the resulting mixture of fuel gas and sulfur dioxide by burning the fuel gas, contained in a mixture of fuel gas and sulfur dioxide, with oxygen so that the concentrated sulfur dioxide and fuel gas are reacted to form a mixture of gaseous products containing sulfur and hydrogen sulphide and removing most thereof, preferably substantially all of sulfur and substantially all of hydrogen sulfide from the gaseous product mixture, with the remaining mixture of gaseous products being post-burned prior to release into the atmosphere.

EFFECT: invention provides a high efficiency of the sulfur extraction, the ability to use the remaining mixture of gaseous products, to reduce the fuel consumption and the absence of losses.

26 cl, 2 dwg, 1 tbl

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical and oil refining industry. Method of utilising sour gases, containing H2S and NH3, with obtaining sulphur, includes processing H2S-containing sour gases by Claus method with after-purification of Claus tail gases and combustion of NH3-containing sour gas on installation for H2SO4 production. Process is carried out with application of two reaction three-chambered furnaces of cyclone type, one of which is installed on Claus thermal step, and the other - on installation for H2SO4 production. Produced H2SO4 circulates on installation for H2SO4 production, with its excess being burnt in reaction furnace of Claus thermal step, where H2S-containing sour gas is supplied. Waste gases from thermal step are supplied to Claus catalytic step, tail gases from which are supplied for combustion in reaction furnace of installation for H2SO4 production, where NH3-containing sour gas is supplied. Quantity of air, supplied into reaction furnace of Claus thermal step, is determined by air, required for thermal H2SO4 dissociation and H2S oxidation, and regulated, taking into account oxygen, released in thermal dissociation. Heat from combustion of NH3-containing sour gases is used in after-purification of Claus tail gases.

EFFECT: invention makes it possible to reduce installation dimensions, reduce quantity of air, supplied to Claus installation by 6-8% (by O2 balance) and increase general efficiency of H2S-containing gas conversion into sulphur to 99,95%.

3 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of treating a sulphur-containing gas and a hydrogenation catalyst used therefor. Described is a hydrogenation catalyst which includes, as an active component, nickel oxide, cobalt oxide and molybdenum oxide or tungsten oxide. One or more compounds selected from iron (II) sulphate, iron (III) nitrate and iron (III) sulphate are added as a deoxidising auxiliary agent. TiO2 and γ-Al2O3 are added in the form of a dry colloid of a titanium-aluminium compound. Also described is a method of treating a sulphur-containing gas with a hydrogenation catalyst.

EFFECT: catalyst has high sulphur dioxide hydrogenation activity and a low operating temperature.

12 cl, 2 dwg, 14 tbl, 11 ex

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry. Hydrogen sulphide is oxidised with oxygen or air at molar ratio oxygen:hydrogen sulphide, equal 0.5-5.0, in reactor with immovable or boiling layer of heterogenic catalyst. Catalyst contains 0.5-10 wt % of complex compound of formula MgCl2·AlCl3·3Et2O on active coal at temperature 130-200°C.

EFFECT: invention makes it possible to increase sulphur output.

2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to chemical technology. Hydrogen sulphide is oxidised with oxygen or air with molar ratio oxygen: hydrogen sulphide equal 0.5-5.0, in reactor with fixed or fluidised bed of heterogeneous catalyst. Catalyst contains 0.5-10 wt % of complex compound with formula CaCl2·ZnCl2·4(C2H5)2O on active charcoal at temperature 130-200°C.

EFFECT: invention makes it possible to increase sulphur output.

2 ex

FIELD: oil and gas industry.

SUBSTANCE: invention is related to petrochemical and gas industries and may be used during wells development at deposits of natural hydrocarbon gases. Hydrogen sulfide and mercaptans are oxidised (P-1) in presence of catalyst with production of elemental sulfur and sulfur dioxide. The received gas is cooled till elemental sulfur is condensed and delivered to tandem layer of adsorbent (A-1), (A-2). At input temperature of the adsorbent is maintained at temperature of 130-150°C and at the output - 100-120°C.

EFFECT: invention allows continuous treatment of gas flows from hydrogen sulfide with variable flow rate and composition.

5 cl, 8 ex, 8 tbl, 2 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to the chemical industry. A gas mixture for the separation of highly sulphurous gas components is subjected to the separation process resulting in the formation of a highly sulphurous gas, which contains carbon dioxide and sulphur compounds. Highly sulphurous gas is supplied to the Claus plant to separate elementary sulphur. Technically pure oxygen is supplied to the Claus plant as a reaction gas. Residual gas, discharged from the Claus plant, containing carbon dioxide and sulphur components, is subjected to catalytic afterburning with technically pure oxygen, with the extraction of a water vapour by condensation. The residual gas, which is mainly composed of carbon dioxide, has a purity, which makes possible its immediate storage or technical application.

EFFECT: invention makes it possible to use carbon dioxide, contained in a highly sulphurous gas.

24 cl

FIELD: chemistry.

SUBSTANCE: invention relates to the chemical industry. Hydrogen sulphide is oxidised by oxygen or air in an installation with an immobile layer of a heterogeneous catalyst on any solid porous carrier at a temperature of 130-200°C and the molar ratio oxygen: hydrogen sulphide 0.5-5. The catalyst, containing 0.5-10 wt % of a complex compound of formula MgCl2·ZnCl2·nEt2O (where n=1-4) is obtained by the impregnation of the solid porous carrier with a solution of the said complex compound in diethyl ether with further drying.

EFFECT: invention makes it possible to increase the sulphur output and selectivity of converting hydrogen sulphide into sulphur.

FIELD: chemistry.

SUBSTANCE: method of producing sulphur from hydrogen sulphide-containing gas by Claus method includes a thermal step and at least one catalytic conversion step. Process gas is fed into a catalytic reactor 1, where it is heated and then subjected to catalytic treatment in a catalyst bed. The process gas is heated by mixing said gas with combustion products fed from a prechamber 5 built into the reactor and having a burner 4 for burning acidic and/or fuel gas. Catalytic treatment of the mixed gas is carried out by filtering through a horizontal catalyst bed 13. The mixed gas is fed through a stabilising device 12 with the possibility of piston movement along the axis of the apparatus and uniform filtration across the entire section of the catalyst. The catalytic reactor 1 is in form of a cylindrical apparatus with an area for heating process gas 2 and a catalyst area 3 arranged in series on the path of the gas.

EFFECT: invention reduces losses when extracting sulphur and sulphur dioxide emissions and prolongs the service life of the catalyst.

5 cl, 2 dwg, 1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to catalysts, used for obtaining element sulphur in Claus process. Claimed catalyst of obtaining element sulphur in Claus process represents mixture χ-, γ-Al2O3 and X-ray amorphous phase of aluminium oxidein the following ratio: χ-Al2O3 and X-ray amorphous phase 65-99.9 wt % and γ-Al2O3 0.1-35, wt %. Volume of mesopores with diameter from 3 to 10 nm in catalyst constitutes 0.12-0.35 cm3/g, and ratio of volume of mesopores with diameter 3-10 nm to volume of ultramacropores with diameter more than 1000 nm is less than or equals 5. Invention also relates to method of preparing said catalyst and method of carrying out Claus process with its application.

EFFECT: application of claimed catalyst makes it possible to increase efficiency of Claus process.

11 cl, 1 dwg, 4 tbl, 12 ex

FIELD: chemistry.

SUBSTANCE: method includes concentration of sulphur dioxide, partial high-temperature reduction of the concentrated sulphur dioxide with concentrated hydrogen to sulphur, hydrogen sulphide and water, condensation of the formed sulphur vapour with output of a liquid medium into a sulphur collector. Then, processing of discharged technological gas by catalytic Claus-conversion, and following purification of the tail gas, which contains residual quantities of H2S, SO2, N2 and water vapours, is carried out. A part of flow of concentrated sulphur dioxide is diverted by a bypass line, skipping stages of high temperature reduction, condensation of sulphur and catalytic convention, and the discharged from a catalytic stage of Claus-conversion tail gas is introduced into a hydrogenation unit. Gas after hydrogenation, consisting of H2S, H2 and water vapours, is supplied into a condensation column for water separation. Dehydrated gas is mixed with a bypass flow of concentrated sulphur dioxide and a mixture is directed to an additional catalytic stage of Claus-conversion, residual gases after which are returned to the input of any catalytic stage, which precedes the hydrogenation unit.

EFFECT: increase of the outgoing gas utilisation efficiency.

8 cl, 2 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of treating a sulphur-containing gas and a hydrogenation catalyst used therefor. Described is a hydrogenation catalyst which includes, as an active component, nickel oxide, cobalt oxide and molybdenum oxide or tungsten oxide. One or more compounds selected from iron (II) sulphate, iron (III) nitrate and iron (III) sulphate are added as a deoxidising auxiliary agent. TiO2 and γ-Al2O3 are added in the form of a dry colloid of a titanium-aluminium compound. Also described is a method of treating a sulphur-containing gas with a hydrogenation catalyst.

EFFECT: catalyst has high sulphur dioxide hydrogenation activity and a low operating temperature.

12 cl, 2 dwg, 14 tbl, 11 ex

FIELD: process engineering.

SUBSTANCE: invention relates to acid components separator. Proposed separator plant comprises tank (8) to accommodate cyclone separator (9). Filter chamber (10) is arranged above said separator (9) in direction of gravity force and equipped with filter plugs (17) and wherein central pipe (20) of cyclone separator (9) is brought. It differs from known design in that separation wall (19) is arranged between cyclone separator (9) and filter chamber. Said separation wall is composed by tapered bottom for central pipe (20) of cyclone separator (9) to pass there through. Note here that smaller-diameter rundown pipe (21) is fitted in central pipe (20) to discharge fine dust. Said pipe (21) is equipped with feed elements (24) to displace fine dust from tapered bottom (19) into rundown pipe (21) and to feed the dust to dust accumulator (23) via dust discharge assembly (22) provided with gates.

EFFECT: higher efficiency of separation.

4 cl, 3 dwg

FIELD: chemistry.

SUBSTANCE: plate contains a multitude of Venturi tubes, made close to each other in the plate in the form of through holes, passing between lower and upper sides, with a possibility of conducting gas to be purified from a space, located under the plate, which is in the working position, through the Venturi tubes and upwards into an absorbent layer, with each of the Venturi tubes having a narrowing in the centre, in which the gas rate increases in such a way that when the gas flow passes the said narrowing, turbulence occurs.

EFFECT: increased efficiency of gas purification and elimination of bulky equipment.

10 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: several Venturi tubes, made close to each other in a plate, containing an upper surface, are used; gas at the first stage is transferred through the Venturi tubes in a direction, opposite to the gravity direction, and at the second stage is bubbled through a liquid layer of an absorbent, located on the upper surface.

EFFECT: invention makes it possible to efficiently separate sulphur dioxide and solid particles from flue gases and does not require bulky equipment.

24 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of adding oxygen to a liquid absorbent, which contains a compound, capable of reacting with oxygen, in a device (1) for gas purification. Used is the device (1), which contains a unit (16) for the absorbent circulation, made with a possibility of transferring the absorbent from the first place in the device (1) into the second place in the device (1), oxygen is added by adding air to the absorbent in the first point in the unit (16) for the absorbent circulation and a separating unit (16e), made with a possibility of separating gas, contained in the absorbent, from the absorbent in the second point, located above the first point, before return of the absorbent into the second place in the device (1), and a part of oxygen, contained in the air, is introduced into a reaction with the compound before its supply into the separating unit (16e).

EFFECT: possibility of adding a sufficient amount of oxygen to the absorbent and prevention of passage of nitrogen, the remaining part of oxygen and other gases, contained in the added air, which represent harmful admixtures, into the device 1 and their mixing there with purified gas.

8 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to ship building. Proposed system is available in three versions. In compliance with first version, complex system for treatment of bilge water and water downstream of exhaust gas filter comprises one device, i.e. two-stage separator composed by rotary separator and membrane filter to feed cleaned water to exhaust gas filter in closed cycle. In compliance with second version, proposed system comprises controlled-output vacuum fan arranged at engine exhaust line while gases are fed to filters by controlled-displacement shutter. In compliance with third version, controlled pH outboard water is used as a cleaning solution for exhaust gas filter. Alkalinity is ensured by mixing outboard water with sweet water or by adding potassium hydroxide. Amount of cleaning solution fed to the filter is optimised in automatic control over pump delivery depending upon gas cleaning quality and engine load.

EFFECT: decreased emission of nitrogen and sulfur oxides.

3 cl

FIELD: oil and gas industry.

SUBSTANCE: average size of particles of fuel improving agent is within range of 1-100 mcm. Invention is related to method of pozzolana production by heating of the target fossil fuels in furnace of fuel improving agent.

EFFECT: increasing combustion efficiency and decreasing carbon content in ash and in consequence in result of combustion useful material is obtained instead of waste.

16 cl, 6 dwg, 2 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to sprayer-drier absorber for removal of contaminants from hot processing gas. Proposed absorber comprises at least two dispersers. Every said disperser disperses a portion of hot processing gas around appropriate sprayer and to swirl it there around. At least one definite disperser swirls the gas flowing there through in direction FC opposite the swirling direction FCC of appropriate portion of process gas dispersed by at least one other disperser located in maximum proximity to said definite disperser.

EFFECT: higher efficiency of removal, lower capital costs.

6 cl, 11 dwg

FIELD: process engineering.

SUBSTANCE: invention may be used in exhaust gas treatment. Proposed method comprises extraction sulfur dioxide at first stage c, flushing off gases by ammonium or its compounds fed via pipeline 10. Then, off gases are directed via pipeline 11 to second stage for flushing whereat sulfur dioxide not extracted at first stage c is oxidised to sulfuric acid by adding hydrogen peroxide via pipeline 12 at pH=1-5 to be extracted thereafter. Formed sulfuric acid release ammonium in the form of ammonium sulphate. Proposed device comprises catcher a to separate fly ash 6 and cooler 17. Scrubber b with discharge pipe 7 extracts hydrochloric acid and hydrofluoric acid.

EFFECT: efficient removal of sulfur dioxide, ruled out emission of ammonium.

23 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to chemistry. cleaning of smoke fumes from electric power stations is performed in several absorption stages in absorber 2. Top section of the latter comprises contact inner level 18 fed with suspension 12 through which crude gas 1 flows. Bottom section of said absorber is equipped with absorption suspension collector 20 above which arranged is crude gas inlet. Proposed device comprises reaction vessel 4 consisting of two chambers 4.1, 4.2 separated by 29 with bypass device. First chamber 4.1 is connected with collector 20 to receive oxidising air 22 while chamber bottom section has suspension discharge hole. Second chamber 4.2 is connected with tank 6 for lime/limestone suspension. Gas exhaust 10 is arranged above both chambers to force vented steam into hood 14. suspension pipeline 12 is arranged between absorber one spraying level 19 and second chamber 4.2 of separate reaction vessel 4. Process water 15 is fed to cleaning level 32 above water-drop eliminator one level 20, 31 and contact level 18 and spraying level 19.

EFFECT: higher efficiency of cleaning.

12 cl, 1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to removal of hydrogen fluoride produced in production of aluminium from aluminium oxide. Gas-cleaning system 1 comprises scrubber chamber 8, 10, 12 for mixing process gas with dispersed aluminium oxide and filter device 24, 26, 28 arranged downstream of said scrubber chamber relative to process gas flow. Device 40, 42, 44, 50 serves to measure sulfur dioxide concentration in process gas flow downstream of sad filter device 24, 26, 28. Control device 45 is coupled with sulfur dioxide metre 40, 42, 44, 50 to use measured sulfur dioxide concentration for estimation of hydrogen fluoride removal efficiency at gas-cleaning system 1.

EFFECT: higher efficiency of fluoride removal.

10 cl, 4 dwg

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