473results about "Gas emission reduction" patented technology

The invention discloses a DCS (Distributed Control System)-based ignition and temperature rise mode of a copper anode slime roasting rotary kiln, which specifically comprises the following steps of: setting initial control conditions, drawing a temperature rise curve according to a target temperature, a temperature rise period and a temperature rise gradient, and then starting ignition preparation. Before natural gas is introduced into the combustion chamber for combustion, rotary kiln operation and combustion-supporting air purging are carried out, after purging is carried out for a period of time, combustion-supporting air and natural gas are introduced for ignition at the same time, and meanwhile the ignition condition is judged through a monitor. And if ignition fails, under the condition of no abnormity, purging can be repeated, and natural gas is introduced for re-ignition. According to the method, the natural gas flow and the combustion-supporting air volume are automatically controlled by the DCS according to the drawn temperature rise curve. The system has the beneficial effects that multiple ignition conditions can be controlled at the same time, remote automatic ignition is achieved, the ignition condition is fed back in time, the natural gas flow is flexibly controlled, the combustion temperature is controlled, the ignition effect of the rotary kiln is guaranteed, and meanwhile production operation safety of the rotary kiln is guaranteed.

To reduce carbon dioxide by treating the carbon dioxide in an arc furnace itself, and to provide a carbon dioxide treatment method using a carbon dioxide treatment technique in the arc furnace itself.SOLUTION: An arc furnace for melting metal is used, carbon dioxide-containing gas is introduced into the arc furnace, and the carbon dioxide-containing gas is brought into contact with an arc in the arc furnace to decompose carbon dioxide into oxygen and carbon monoxide. Carbon monoxide and oxygen after decomposition are recovered and reused by a recovery system, and undecomposed carbon dioxide is also recovered by the recovery system and introduced into the arc furnace again to be treated.SELECTED DRAWING: Figure 1

This invention provides processes and systems for converting biomass into high-carbon biogenic reagents that are suitable for a variety of commercial applications. Some embodiments employ pyrolysis in the presence of an inert gas to generate hot pyrolyzed solids, condensable vapors, and non-condensable gases, followed by separation of vapors and gases, and cooling of the hot pyrolyzed solids in the presence of the inert gas. Additives may be introduced during processing or combined with the reagent, or both. The biogenic reagent may include at least 70 wt %, 80 wt %, 90 wt %, 95 wt %, or more total carbon on a dry basis. The biogenic reagent may have an energy content of at least 12,000 Btu / lb, 13,000 Btu / lb, 14,000 Btu / lb, or 14,500 Btu / lb on a dry basis. The biogenic reagent may be formed into fine powders, or structural objects. The structural objects may have a structure and / or strength that derive from the feedstock, heat rate, and additives.

The invention discloses a layered, zoned and differentiated CO2 injection system and method for a blast furnace, and belongs to the technical field of ferrous metallurgy low carbon. The system comprises a CO2 supply and distribution system, a tuyere area injection module, a furnace body middle-lower part injection module and a furnace body upper part injection module. And according to the temperature gradient and atmosphere layering characteristics in the blast furnace, a differential CO2 distribution proportion and a collaborative thermal compensation strategy are adopted. An oxygen-CH4 synergistic injection device is arranged in a tuyere area, and rapid conversion of CO2 is promoted by using a high-temperature strong reducing atmosphere; a biomass charcoal synergistic injection device and an angle-adjustable nozzle are arranged at the middle lower part of the furnace body, so that efficient gasification reaction is realized; and low-concentration CO2 mixed injection is adopted at the upper part of the furnace body, so that indirect reduction reaction is promoted. According to the invention, the CO2 conversion rate is 65-80%, the coke ratio is reduced by 15-25%, the consumption of CO2 per ton of iron is 260-90Nm < 3 >, the carbon emission is obviously reduced, and the ironmaking efficiency is improved.

This invention provides processes and systems for converting biomass into high-carbon biogenic reagents that are suitable for a variety of commercial applications. Some embodiments employ pyrolysis in the presence of an inert gas to generate hot pyrolyzed solids, condensable vapors, and non-condensable gases, followed by separation of vapors and gases, and cooling of the hot pyrolyzed solids in the presence of the inert gas. Additives may be introduced during processing or combined with the reagent, or both. The biogenic reagent may include at least 70 wt %, 80 wt %, 90 wt %, 95 wt %, or more total carbon on a dry basis. The biogenic reagent may have an energy content of at least 12,000 Btu / lb, 13,000 Btu / lb, 14,000 Btu / lb, or 14,500 Btu / lb on a dry basis. The biogenic reagent may be formed into fine powders, or structural objects. The structural objects may have a structure and / or strength that derive from the feedstock, heat rate, and additives.

The equipment comprises a heating furnace, an opening is formed in one side of the heating furnace, a die forging furnace is arranged in front of the opening at intervals, transmission chains extending to the two sides of the die forging furnace are arranged on the two sides of the opening of the heating furnace, and pipe body deformation restraining pipes are arranged on the portions, located above the two transmission chains, of the two sides of the die forging furnace correspondingly. The two pipe body deformation restraining pipes are coaxially arranged, the ends, away from the die forging furnace, of the two pipe body deformation restraining pipes are connected with a stopping base and a power base respectively, and one side of the stopping base is coaxially connected with an easily-drilled metal rod stretching into an inner hole of a drill pipe body in the die forging furnace through a connecting rod. Compared with an existing drill rod with an anti-abrasion sleeve additionally arranged in the middle of a pipe body, the drill rod is safer and more reliable in use, and the service life of the pipe body of the drill rod is prolonged; meanwhile, compared with a drill rod with a thickened middle formed by turning a thick-wall round pipe, a large number of steel material resources can be saved, the production cost is reduced, and the production efficiency is improved.

An ironmaking method comprising the production of hot metal (2) and of a blast furnace top gas (10), the method comprising the steps of capturing at least a part of the top gas (10), separating CO2 from the captured top gas (10) so as to produce a CO2-rich stream (12) and a CO2-lean stream (11), mixing the CO2-rich stream (12) with a H2 makeup stream (30) and subjecting the obtained CO2 / H2 gas mixture to a reverse water gas shift reaction in a reactor (3) to produce a reducing stream (13) comprising CO and H2, separating H2 from the reducing stream to produce a CO- rich stream (14) and an H2-rich stream (15), mixing the H2-rich stream (15) with the CO2-rich stream (12) or with the CO2 / H2 gas mixture in the reactor (3) and subjecting the obtained gas mixture to the reverse water gas shift reaction and feeding at least a portion of the CO-rich stream 14 (13) to at least one chemical or biochemical plant (4) to produce one or more chemical products (16).

This invention provides processes and systems for converting biomass into high-carbon biogenic reagents that are suitable for a variety of commercial applications. Some embodiments employ pyrolysis in the presence of an inert gas to generate hot pyrolyzed solids, condensable vapors, and non-condensable gases, followed by separation of vapors and gases, and cooling of the hot pyrolyzed solids in the presence of the inert gas. Additives may be introduced during processing or combined with the reagent, or both. The biogenic reagent may include at least 70 wt %, 80 wt %, 90 wt %, 95 wt %, or more total carbon on a dry basis. The biogenic reagent may have an energy content of at least 12,000 Btu / lb, 13,000 Btu / lb, 14,000 Btu / lb, or 14,500 Btu / lb on a dry basis. The biogenic reagent may be formed into fine powders, or structural objects. The structural objects may have a structure and / or strength that derive from the feedstock, heat rate, and additives.

The invention discloses a CO2-mediated indirect hydrogen metallurgy blast furnace smelting process, and belongs to the technical field of low-carbon metallurgy and hydrogen metallurgy. According to the process, on the premise that the main body structure of a blast furnace is not changed, CO2 in furnace top gas is captured and mixed with external H2, a reverse water-gas shift reaction is carried out in a high-temperature and high-pressure environment outside the furnace, and high-temperature CO reducing gas is generated; and then directly injecting the high-temperature reducing gas into a soft melting zone area of a blast furnace body by utilizing a special device. According to the method, a central coke adding and distributing mode and a quick response coal injection strategy are matched, and part of pulverized coal and coke can be effectively replaced; by constructing a heat transfer mechanism of heat absorption conversion outside the furnace and heat release reduction inside the furnace, the heat absorption reaction is transferred to the outside of the furnace to be completed, meanwhile, high-temperature gas injected into the furnace body is used for directly supplementing heat in the furnace and strengthening indirect reduction reaction, and cyclic utilization of CO2 is achieved.

A zero-carbon flash reduction ironmaking device comprises a reaction tower, the reaction tower is arranged upside down, a flash reduction area, an iron powder waste heat boiler and a green oxygen preheater are sequentially arranged in an inner cavity of the tower from top to bottom, oxyhydrogen powder entering the tower is subjected to oxyhydrogen combustion, mineral powder green hydrogen absorbs heat and is heated to the high temperature, and all hydrogen reduction reaction is completed before the mineral powder flows out of the flash reduction area. Iron powder is cooled through an iron powder waste heat boiler and a green oxygen preheater, hydrogen steam is cooled through a hydrogen steam waste heat boiler and a mineral powder preheater, and hydrogen water is separated through a cyclone dehydrator and a drying filter. The iron ore concentrate powder with the particle size smaller than 200 meshes falls into a powder bin, the reduction temperature ranges from 1100 DEG C to 1200 DEG C, the time for the ore powder to flow through a flash reduction area ranges from 2 s to 3 s, and the temperature for the ore powder to leave an iron powder waste heat boiler and the temperature for hydrogen steam to leave a hydrogen steam waste heat boiler range from 125 DEG C to 175 DEG C. The invention can be used for flash smelting of iron ore concentrate powder. The invention has the advantages of high waste heat recovery rate, long service life of the furnace lining, low energy consumption and zero carbon emission, and can avoid using the key management object coke ironmaking blast furnace device of the national two-high project.

The utility model discloses a refractory material production performance testing device which comprises a box body, a box door hinged to the front side of the box body through a hinge, supporting frames fixedly connected to the front side and the rear side of the bottom of the box body, an exhaust pipe arranged on the right side of the box body, a fan fixedly connected to the left side of the box body, and a detection mechanism arranged in the box body. And a fixing mechanism is arranged in the box body. According to the utility model, the detection mechanism and the fixing mechanism are used, so that the cylindrical refractory material can be subjected to extrusion and high-temperature testing, and the problem that when the refractory material is tested, various different testing devices, such as a high-temperature testing device, a pressure-resistant testing device and the like, need to be used for comprehensively evaluating the performance of the refractory material is solved; therefore, the refractory material testing cost is increased, the refractory material testing time is prolonged, the refractory material testing efficiency is reduced, and the device has the advantage of being convenient to detect.

The application discloses a low-temperature firing method of mixed porcelain blanks, which comprises three stages. By controlling the kiln pressure, combustion-supporting wind, temperature-adjusting wind, natural gas flow and opening degree of each zone in each stage, the heating speed of each stage is controlled, the porcelain blanks prepared by dry and wet methods are fired together, the problem that the two kinds of porcelain blanks need to be fired respectively in the prior art is solved, the problem of main body cracking and burst of the porcelain blanks due to different water contents of the two kinds of porcelain blanks in the firing process is solved, and the firing efficiency is greatly improved under the premise of ensuring the quality of the porcelain blanks.

Apparatus for the production of molten iron including a metallurgical vessel, having a surrounding wall, a cyclone part provided on top of a smelt reduction part, the cyclone part being in open connection with the smelt reduction part and having at least one supply apparatus around the circumference of the surrounding wall adjusted to introduce oxygen gas into the cyclone part, wherein the at least one supply apparatus is further adjusted to introduce a mixture of oxygen gas and a combustible gas.

A blast furnace operation method according to the present invention is a blast furnace operation method of blowing oxygen gas and a reducing agent containing methane gas into a blast furnace from a tuyere of the blast furnace includes blowing preheating gas having an amount of carried heat greater than or equal to a predetermined amount of heat set in accordance with a blowing amount of the methane gas into the blast furnace from a gas blowing portion provided above the tuyere of the blast furnace in a case where an oxygen concentration in the oxygen gas is 80 vol% or more.

A microwave process and apparatus for processing ore, including a supply of reaction gases from Unipolar electrolysis, which provides an efficient and economical source of reaction gases The process and apparatus includes a reaction gas microwave pre-heat zone to pre-heat the reaction gases to a first temperature prior to input into a main reactor body where the temperature is raised to a higher second temperature to melt the ore and process it into desirable products, such as green steel in an energy efficient manner with reduced emissions.

The invention belongs to the technical field of blast furnace gas treatment, and relates to a method for controlling zero emission of gas in a single blast furnace, which comprises the following steps: step 1, carrying out comprehensive adjustment according to original gas balance, and maintaining gas supply and demand balance; 2, by means of interval regulation and control of the gas holder, dynamic storage of the gas holder and pressure stabilization of a pipe network are achieved; step 3, effectively controlling a switch valve group of tail end diffusion to ensure that the tail end diffusion is safe and controllable; and 4, emergency treatment is conducted in the abnormal production state, special measures are made for blast furnace air reduction, gas flow abnormity and gas temperature abnormity, system safety is guaranteed preferentially, and the zero-emission target is dynamically maintained. According to the method, efficient utilization and zero emission of the blast furnace gas are achieved through multi-link cooperative regulation and control, environmental pollution is reduced, and production economy is improved.

The present application relates to the technical field of combustor, in particular to a kind of low-nitrogen combustor of roasting furnace natural gas based on cyclone and staged combustion, solve the problem that more nitrogen oxides can be produced in the combustor in the prior art;It includes outer sleeve, inner sleeve and inner core tube, the outer sleeve is sleeved on the outside of inner sleeve, air flow channel is formed between the outer sleeve and inner sleeve, the inner core tube is connected to the inside of inner sleeve, the inner sleeve is formed with natural gas flow channel through inner core tube, the inner wall of outer sleeve is formed with first rifling, the inner wall of inner sleeve is formed with second rifling, spiral groove is formed on the inner core tube and penetrates both ends;The scheme utilizes multiple rifling structures to make air and gas produce cyclone, improve mixing effect, enhance the radiation heat transfer effect of combustion in the furnace on furnace wall, increase the thermal efficiency of equipment, reduce energy waste, compared with conventional direct injection type combustor, NOx is reduced by 40.7%, and flame length is nearly 2 times of conventional direct injection type.

The present disclosure relates to a process for producing sponge iron from iron ore, comprising the steps of: - charging iron ore into a direct reduction shaft (211), - introducing a hydrogen-rich reducing gas (215) into the direct reduction shaft to reduce the iron ore and produce sponge iron (209), - removing a top gas (216) from the direct reduction shaft, - splitting the top gas into a recycle stream (218) and an extract stream (256), - processing the extract stream through a separation unit (257) to provide a hydrogen-rich off-stream (258) and an inerts-rich off-stream (259), - introducing the recycle stream and the hydrogen-rich off-stream into the direct reduction shaft as constituent parts of the hydrogen-rich reducing gas. The present disclosure further relates to a system for producing sponge iron.

The utility model discloses a natural gas melting furnace for melting aluminum ingots, and belongs to the technical field of metal melting equipment. The melting furnace comprises a box body and a furnace body, a liquid oxygen storage tank, a VPSA oxygen generator and a waste gas treatment box are integrated in the box body, and the liquid oxygen storage tank is connected with an oxygen supply pipeline through a vaporizer; the furnace body shell adopts a gradient refractory layer structure; the oxygen supply pipeline is of a Y-shaped parallel structure, a flame arrester and a dynamic pressure balance valve are arranged in the oxygen supply pipeline, and the oxygen flow is adjusted through linkage of a pressure sensor and a controller. A water-cooling observation window is arranged on the inner wall of the furnace body, and a thermal infrared imager is installed on the outer side to monitor the temperature of a molten pool and feed back and control combustion power. According to the utility model, efficient melting, safe oxygen supply and accurate temperature control are realized through structure optimization, and the device is suitable for continuous melting scenes of aluminum ingots.

A method for producing reduced iron that produces reduced iron by reducing iron oxide charged in a shaft furnace, in which a gas mixture which contains a reducing gas and a nitrogen gas, and has a predetermined temperature, is blown into the shaft furnace. The reducing gas contains 90 volume % or more of a hydrogen gas.

Provision of a gas production apparatus that can stably produce a product gas with carbon monoxide as its main component from a separated gas including carbon dioxide as a main component. The gas production apparatus 1 consists of the following: a separation and capture section 5, which separates and captures separated gas containing mainly of carbon dioxide from the exhaust gas taken from the line of the exhaust gas equipment; a reaction section 4 including at least a reactor, which is connected to downstream of the separation and capture section 5, contains a reducing agent that generates carbon monoxide through a reduction reaction of carbon dioxide brought into contact with the separated gas, and is capable of separating at least some of oxygen atoms separated from carbon dioxide; a pressure regulating section 7 connected to downstream of the reactor 4 to regulate the pressure of the separated gas supplied to the reactor; and the flow regulating section 6 connected on the upstream of the separation and capture section 5 and regulates the flow rate of the separated gas supplied to the reactor.

The present disclosure relates to an apparatus for producing hot briquetted iron. The apparatus (1) comprises: a briquetting press (10) and a force feeder arrangement (30). The apparatus further comprises: a powder injection arrangement (70), the powder injection arrangement comprising a powder dosing unit (71) and at least one injection line (73). The powder dosing unit is arranged to be able to dose powder at a predetermined rate to the at least one injection line. Each injection line extends from a line inlet (75) to a line outlet (77). Each line inlet is arranged to be connectible to a source of pressurized carrier gas (79) and each line outlet is arranged to be able to inject powder into a material supply tank of the force feeder arrangement. The disclosure further relates to a method for producing hot briquetted iron using such an apparatus.

A gas production apparatus includes: a separator configured to separate and capture a separated gas including carbon dioxide as a main component from an exhaust gas of exhaust gas equipment; reactors which are downstream of the separator, each of the reactors: (i) containing a reductant configured to contact the separated gas to produce carbon monoxide through a reduction reaction of carbon dioxide; (ii) being configured to separate at least some oxygen atoms split off from carbon dioxide in the reduction reaction; and (iii) having a reducing agent containing a metal oxide configured to reduce carbon dioxide as the reductant; a reducer configured to supply a reducing gas containing a reducing substance configured to reduce the reducing agent oxidized by contact with carbon dioxide; a pressure regulator configured to regulate a pressure of the separated gas; and a flow regulator configured to regulate a flow rate of the separated gas.

The invention discloses a furnace top gas cyclic reforming process and system, and the reforming process comprises the following steps: S1, heating furnace top gas generated by a blast furnace to 1000-1200 DEG C to obtain high-temperature gas; s2, mixing the high-temperature coal gas with coal, and carrying out electromagnetic induction heating coal gas reforming reaction to generate reduced coal gas which is 900-1000 DEG C and contains CO and H2; s3, performing plasma heating on the reduced gas to 1400-1800 DEG C to obtain high-temperature reduced gas; s4, recycling the high-temperature reduction coal gas to the lower part of the blast furnace for circular treatment; according to the method, a carbon capture device of a conventional oxygen blast furnace and a top combustion type gas heating furnace and a CO2 removal device of a carbon circulation blast furnace are replaced by circular reforming of the furnace top gas, so that the energy consumption and the equipment investment of the technological process are reduced.

A process for reducing iron oxides by fluidized bed, implemented in a set of several reduction reactors (3a), this process comprising, for each of said reduction reactors (3a), a treatment process dedicated to said reactor comprising: a loading sequence of said reactor (3a) with a predetermined quantity of iron oxides constituting a bed (1a), a reduction sequence comprising: heating of the bed of iron oxides loaded in the reactor (3a), this heating being intended to reach a predetermined temperature in said reactor (3a), and injection of pressurized gas including hydrogen gas (H2) into the fluidized bed (1a), a discharge sequence of the iron thus obtained, from said reactor. The reactor (3a) is depressurized at the end of the reduction sequence and prior to the next loading sequence with iron oxides. See Figure 4

The ladle baking device comprises a base, a steel ladle placed on the base and a ladle baking device which is arranged on the base and can ascend and descend, and is characterized in that a placing groove is formed in the base, and the rear side of the placing groove is of a square structure; an opening is formed in the outer side of the containing groove, the width of the opening is gradually reduced from outside to inside till the width of the opening is consistent with the width of the square structure, two square blocks extending in the front-back direction are arranged on the left side and the right side of the bottom of the steel ladle, and inserting holes allowing forks of a forklift to be inserted are formed in the middles of the square blocks. And when the steel ladle is placed in the placing groove and the left side wall, the rear side wall and the right side wall of the steel ladle abut against the left side wall, the rear side wall and the right side wall of the placing groove correspondingly, the ladle baking device is located over the steel ladle. According to the ladle baking device, before baking, a steel ladle containing aluminum ingots is transported and placed in the containing groove through a forklift, when the steel ladle is placed in the containing groove, the steel ladle is guided and positioned through the containing groove, the position of the steel ladle is determined after the steel ladle is stably placed, and baking can be conducted only by descending the ladle baking device.

A method and system are provided for feeding a feed mixture into an electric furnace. The method comprising producing a homogeneous feed mixture and charging the furnace with the homogeneous feed mixture. The homogeneous feed mixture, being one or both of compositionally and thermally homogeneous, includes DRI, and one or more of fluxes, scrap, reductants and reverts, used to charge electric furnaces. The system comprises a mixing unit for combining feed components into a homogeneous mixture. The mixing unit may be a screw conveyor. The mixing unit is connected to the furnace to charge the furnace with the homogeneous feed mixture.

A method for smelting high-proportion sefstromite by using an oxygen blast furnace. The method comprises the following steps: with pure oxygen blowing being used in a blast furnace, injecting pure oxygen, hot coal gas and pulverized coal from a tuyere, adding an iron charge and coke from the top of the furnace, wherein the volume percentage of N2 in coal gas at the top of the furnace is less than 25%, removing CO2 from the coal gas at the top of the furnace, and then recycling same. The method for smelting high-proportion sefstromite by using an oxygen blast furnace in the present invention can achieve such smelting that the proportion of sefstromite in the blast furnace is greater than 60%, the mass fraction of TiO2 in blast-furnace slag is greater than 15%, but smaller than 45%, and the emission of CO2 is reduced by 30% or more, and solves the problems of thick furnace slag, difficulties in slag-iron separation, blast wandering, high costs, high carbon emissions, etc., of conventional blast furnace smelting in the case of an increase in the proportion of sefstromite, thereby achieving higher utilization efficiency of vanadium-titanium resources, lower smelting costs and lower carbon emissions.

The utility model relates to a simple sand mold baking device which comprises a main pipeline, a natural gas pipe joint arranged at the top end of the main pipeline, a plurality of wind shields arranged between the natural gas pipe joint and the main pipeline, gaps communicated with the outside and arranged among the wind shields, and a compressed air joint arranged on the side wall of the lower end of the main pipeline. The compressed air connector communicates with the interior of the main pipeline, and a limiting supporting plate is arranged on the outer wall face of the bottom end of the main pipeline. By means of the injection-suction type principle, hot air is fed into a cavity through a pouring system, the whole cavity is baked through the hot air, and water vapor generated through baking can also escape from a dead head through the hot air.

This invention provides a method for low-temperature reduction roasting pretreatment of chromite pellets under a CH4-containing reducing atmosphere, belonging to the field of metallurgical technology. The method includes the following steps: mixing chromite powder, binder, and water to form pellets, obtaining green chromite pellets; mixing CH4 and a reducing gas to obtain a CH4-containing reducing atmosphere, wherein the reducing gas includes H2 and / or CO; and reducing roasting the green chromite pellets in the CH4-containing reducing atmosphere. This invention introduces CH4 gas into the reducing atmosphere, without using solid carbon. CH4 can decompose and release carbon at relatively low temperatures, which is beneficial for the smooth operation of common industrial equipment. The released carbon has high activity and can effectively dissociate the spinel phase in chromite, and rapidly achieve effective reduction of Fe and Cr oxides therein, obtaining chromite pellets with a certain degree of pre-reduction of metallic iron and chromium and a certain strength.