286results about "Gas emission reduction" patented technology

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.

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.

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 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 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 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 invention relates to an ironmaking method wherein two gases (13,14) are injected into a blast furnace at a single level, said injection being done at the tuyere level of the blast furnace and comprises the injection of an O2-rich gas (13) comprising more than 95% in volume of O2 and of an H2-rich gas (14) comprising more than 95% of H2, without any injection of other reductant at the tuyere level.

The invention relates to the technical field of activated carbon firing, and particularly discloses hard activated carbon high-temperature firing processing equipment which comprises a rotary furnace body, a supporting plate is arranged on the lower side of the rotary furnace body, mounting frames are fixedly connected to the two sides of the top end of the supporting plate, and a heating mechanism is arranged on the rotary furnace body. Through the synergistic effect of the first spiral plate, the second spiral plate, the third spiral plate and the material stirring teeth, the problems that an existing straight shoveling plate is insufficient in material turning, and materials are caked and stacked are thoroughly solved, the materials can be fully turned in the furnace and make contact with a high-temperature atmosphere and an activating agent without dead corners, and the energy consumption is reduced. Meanwhile, the activating agent is uniformly distributed in each part of the activation area through the axial multi-point steam distribution structure, so that uniform activation of materials is realized, pore distribution of finished activated carbon is more uniform, the adsorption performance and the product consistency are greatly improved, and the production requirements of high-quality hard activated carbon are met.

An apparatus for electrically heating a gas (3) is proposed, said apparatus comprising heating tubes (220) provided in one or more heating arrangements (200, 300) and a transformer (420), wherein said heating tubes (220) comprise tube sections (221, 222, 223) which are configured to be electrically connected, at a first end thereof, to phases (L1, L2, L3) of a transformed multiphase outlet voltage of said transformer (420), and which are electrically interconnected, at a second end thereof, in order to resistance heat said tube sections (221, 222, 223), wherein said transformer (420) is configured to be connected to an electrical supply voltage provided as an inlet voltage to the transformer (420) and is configured to transform the inlet voltage to said multiphase outlet voltage, and wherein said apparatus is configured to supply said multiphase outlet voltage to the, or each of the, heating arrangements (200, 300) and the heating tubes (220) therein without further transformation. A corresponding method in which the apparatus is used, and a process for the direct reduction of iron ore is also proposed.

There is provided an ultra-high oxygen enrichment type low carbon smelting method, which includes a charging step and a blast furnace smelting step, in which the blast furnace oxygen enrichment rate is 40% to 50%, the oxygen enrichment rate of the hot stove portion reaches 15 to 20%, the air temperature is in the range of 900 to 1000°C, and for the portion that is insufficient, cold oxygen is blown in from the blowing port, and pulverized coal, highly reducing coal gas, and coke oven gas are blown in from the blowing port to maintain the theoretical combustion temperature at the blowing port in the range of 2350 to 2500°C, and during that period, the blowing coal ratio is 0.3 to 0.35 kg / m of coke oven gas. 3 or the coke rate is reduced to 0.28-0.3 kg / m of decarbonized coal gas. 3 By lowering the replacement rate to 210 kg / t or less at the high oxidation enrichment stage in the blast furnace, the problem of "cold at the top and hot at the bottom" that occurs is solved, and the goal of reducing coke consumption is achieved.

The invention discloses blast furnace stemming and a preparation method thereof. The invention discloses a high-temperature-resistant wear-resistant coating which is characterized by comprising the following components in parts by weight: 380-420 parts of brown aluminum oxide, 70-90 parts of a carburant, 50-70 parts of Guangxi white mud, 110-150 parts of silicon carbide, 15-30 parts of asphalt powder, 5-30 parts of vanadium carbide or chromium carbide or a mixture of vanadium carbide and chromium carbide or pore-forming vanadium chromium carbide and 50-100 parts of liquid resin. The blast furnace stemming disclosed by the invention has relatively high high-temperature breaking strength, normal-temperature compression strength and normal-temperature breaking strength, and excellent slag and molten iron erosion resistance and molten iron scouring resistance.

The utility model relates to an ignition control system for an incandescent light of an acid gas combustion furnace. An inlet of a natural gas cut-off electromagnetic valve is connected with a natural gas pipe network, and an outlet of the natural gas cut-off electromagnetic valve is connected with a natural gas flame arrester; the natural gas flame arrester is connected with an inlet of a natural gas steel wire hose; the natural gas steel wire hose is connected with a natural gas pipe orifice of the incandescent light burner; an inlet of the combustion air cut-off electromagnetic valve is connected with an air pipe network, and an outlet is connected with the combustion air steel wire hose; the natural gas steel wire hose is connected with a natural gas pipe opening of the incandescent light burner, and the combustion air steel wire hose is connected with an air inlet pipe opening of the incandescent light burner. By accurately regulating and controlling the flow ratio of the fuel gas to the combustion-supporting air and adopting the electromagnetic valve for remote control and the temperature sensor for real-time monitoring, the ignition efficiency and safety are remarkably improved, and the ignition failure rate is reduced. The system is simple in structure, convenient to operate and suitable for various acid gas combustion furnaces.

The invention relates to the technical field of single-billet visual closed-loop temperature control push cylinder type natural gas porous soaking, and discloses a single-billet visual closed-loop temperature control push cylinder type natural gas porous soaking furnace which comprises a furnace body, a controller is arranged on the upper surface of the furnace body, a support is fixedly connected to the surface of the furnace body, and a supporting frame is fixedly connected to the surface of the furnace body. A continuous feeding device is arranged on the surface of the furnace body, a rolling adjusting device is arranged in the furnace body, and a limiting conveying device is arranged in the furnace body. When a steel billet enters the furnace body, the controller controls the proportional valves in different areas to feed fuel gas, so that the furnace body heats the steel billet at a proper temperature through detection of the double-spectrum industrial camera through the observation hole, and the combustion-supporting fan controls the combustion-supporting speed of the combustion-supporting air branch pipe, so that the temperature is more stable when the machine heats the steel billet; and an electric push rod of the feeding push cylinder is started, and the output end pushes the pushing clamping plate to move above the feeding roller so as to clamp a steel billet needing to be machined.

The invention discloses a spodumene rotary kiln roasting control method and system fused with visual perception, electronic equipment and a storage medium, and relates to the field of rotary kiln control of spodumene roasting. According to the method, multi-source data such as blanking, fuel, temperature, pressure and roasting material process images are collected, and an image recognition model is used for analyzing the apparent state of the roasting material and recognizing abnormity; in combination with correlation analysis of temperature and pressure data and historical data, the conversion rate of the roasting material is predicted in real time; and according to the state identification result and the conversion rate prediction value, the blanking amount, the fuel supply and the fan frequency are adjusted in a linkage mode, and intelligent closed-loop control and dynamic optimization of the thermal state and the material reaction in the kiln are achieved. The roasting conversion rate and the product stability can be remarkably improved, and manual dependence is reduced.

The invention relates to a green energy-driven circulating blast furnace partition reduction melting separation process which comprises the following steps: reducing and heating first furnace top gas by taking green electric power as a main energy source to obtain high-temperature circulating gas; high-temperature circulating coal gas is sprayed into the furnace through a blast furnace tuyere and ascends to the upper part of the blast furnace through a melting zone at the lower part of the blast furnace to form an indirect reduction zone, and the furnace charge is reduced by the high-temperature circulating coal gas in the indirect reduction zone to obtain metallized furnace charge and second furnace top coal gas; the second furnace top gas returns to the step S1 for reduction and heating; and the metallized furnace burden moves downwards to the melting zone in the blast furnace, and slag and iron are discharged after melting separation. Coal gas is driven to be recycled and regenerated through green electric power, reduction and heating of coal gas CO2 at the top of the blast furnace are achieved, dependence of a traditional blast furnace on fossil fuel combustion is greatly reduced, the coal gas utilization rate is effectively increased, and carbon emission is reduced.

A process for treating a material, such as by a calcination or reduction process, is disclosed that includes reacting hydrogen and oxygen in a reaction chamber to produce heat and steam, venting the steam from the reaction chamber, using the heat to treat the material to produce a treated material, and returning at least a portion of the steam vented from the reaction chamber to the process. An apparatus is also disclosed.

1. A method for producing direct reduced iron, in which iron ore is reduced in a DRI shaft by a reducing gas comprising hydrogen obtained by extraction from coke oven gas through a hydrogen separation unit, and a remaining portion of such coke oven gas is at least partially injected into a transition section of the DRI shaft to set the carbon content of the direct reduced iron to 0.5-3 wt. %, as well as a DRI production plant comprising a DRI shaft (1) and a hydrogen separation unit (5), the inlet of which is connected to a coke oven gas source (6), a first outlet connected to the DRI shaft for injecting hydrogen separated from the coke oven gas, and a second outlet connected to a transition section of the DRI shaft (1) for injecting at least a portion of the remaining portion of such coke oven gas.

Provided is a method which is for producing reduced iron and by which both energy saving and a reduction in CO2 discharge amount can be achieved. This system is configured to circulate and reuse a furnace top gas, and has a blowing step, a reduction step, a distribution step, a synthesis step, and a reforming step, wherein a distribution ratio of the furnace top gas in the distribution step is controlled according to a composition of a raw material gas used in the reforming step.

The invention belongs to the technical field of blast furnace ironmaking, and particularly discloses a solid fuel replacement and hydrogen-rich injection method in a hydrogen-rich carbon cycle oxygen blast furnace mode. According to the method, the quantitative replacement relation between the decarburized gas injection amount and the coke consumption reduction amount is established, a composite injection plan of'gas first and powder second and cooperative climbing 'is implemented, and hydrogen-rich gas enhanced injection is planned, so that the solid fuel consumption and the carbon emission are systematically reduced. The method specifically comprises the following three steps: establishing a fuel replacement reference, implementing decarburized gas dominant replacement and pulverized coal collaborative replacement in stages, planning hydrogen-rich gas injection reinforcement, and controlling key injection parameters and crude fuel quality at the same time. According to the method, the coke ratio is reduced by more than or equal to 60kg / t, the solid fuel consumption is reduced by more than or equal to 15%, the CO2 emission is reduced by more than 2%, the operation path is clear and controllable, the furnace condition is stable and smooth, the technical extensibility is high, and the method is suitable for industrial application of a large blast furnace HyCROF mode.

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.