3418 results about "Hearth" patented technology

A multi-purpose, multi-oxy-fuel High Temperature Power Burner/Injector/Oxygen Lance, Mechanical System Apparatus Device, for steelmaking from recycled scrap and/or virgin ferrous charge, which can be employed in multi-oxy-fuel (natural gas; pulverized carbonaceous matter; heavy oil), especially by Oxygen Combusted mixture of Natural Gas/Pulverized Carbonaceous Matter in High Temperature Power Burner Mode, for efficient and rapid melting of solid ferrous charge (cold or preheated) in a special steelmaking Metallurgical Furnace or Open Hearth Furnace, Tandem Furnace, BOF, EAF, as its augmenting or only source of thermal energy; more than one Device in Oxygen-Natural Gas/Pulverized Carbonaceous Matter Power Burner Mode, can be employed as the only source of thermal energy in a modified, originally Electric Arc Furnace, as total replacement of Graphite Electrodes and Electric Arc System, the replacement being noticeably more primary energy efficient than the thermal energy provided by Graphite Electrode/Arc System; it also can be employed in an Solid Particles Injector Mode, for injecting of adequately granulated carbonaceous materials or lime into the molten steel for its carburizing or for foamy slag control; further it can be employed in a natural gas shrouded, pulsating oxygen stream, for vertically to the charge oriented soft blow supersonic Oxygen Injection Lance Mode, for decarburization of the molten metal contained in the hearth of the metallurgical furnace and foamy slag control; in one of the embodiments-generally arcuate-pivotally mounted, liquid media cooled composite body, is pivoted into and out of a furnace vessel through a small opening in the shell wall for auto-regulated constant optimal positioning of the Composite Body Tip against solid or molten charge, in each and all multi-purpose modes; furthermore, when inserted into the furnace vessel, the arcuate composite body can be rotated about its longitudinal axis for directing the oxy-fuel high temperature flame towards unmolten charge in the furnace; in an other-generally linear-embodiment, the liquid cooled composite body is attached to the mast type carrier allowing vertical movement of the composite body which enters the furnace vessel through a small opening in the furnace roof; the bimetallic, liquid cooled special tip assembly of both-arcuate and linear embodiments-of the composite body includes easy replaceable, independent, multi-opening nozzles, mounted in a protective, retracted position inside of the liquid cooled special tip assembly.

The invention discloses a production method of low-silicon and low-carbon deep punching/drawing steel, bottom-blowing argon is performed in the whole process of converter smelting, and a single slag/double slag technique is adopted to pour out the dephosphorized slag, high-basicity slag is produced in later period, the dualistic basicity of final slag R is more than 3.5, the terminal temperature of molten steel is 1620 DEG C to 1650 DEG C, and tapping ( P ) is less than 0.012 percent. The molten steel is refined by adopting low-silicon and low-carbon high-basicity reductive slag in a LF furnace refining station, thus to manufacture reductive slag for desulphurisation, and the ( Al ) in the molten steel is less than 0.005 percent. The molten steel refined by the LF furnace is vacuum-treated by a RH vacuum furnace, the carbon and the silicon in the molten steel is circularly removed, the molten steel is continuously casted into a casting blank through a CSP sheet bar conticaster, the casting blank is sent into CSP sheet bar heat continuous rolling mill and rolled into a coiled sheet after being heated in a roller hearth soaking furnace, a hot rolled coiled sheet is coldrolled into cold rolled coiled sheet through a cold tandem mill or a single mill after being acidwashed, and leveled through a leveling machine after being annealed by a cover furnace, and a leveling divided coil is stretched and divided. The production method has the advantages that the production cost of the working procedure is saved, the consumption of the refractory consumption of the converter is reduced, the equipment investment is saved, the process of the production technique is steady and smooth, the n value of the cold rolled plate is bigger than 0.23, the r value thereof is bigger than 2.1, and the deep punching performance and the extensibility are good.

The invention is a fluid bed gasification and combustion processing method for urban garbage. The hearth of a fluid bed garbage furnace (4) is composed of two parts of a low temperature gasification area and a high temperature combustion area, additives (f) such as limestone, kaolin, etc. are added to the garbage furnace (4); acid gases such as chlorine, sulfur, nitrogen, etc. are removed in the furnace; and the generation of dioxin is controlled in the furnace. A water cooling spiral slag cooler (5) and a vibration sieve (6) can be utilized to efficiently reduce heat loss of slag and recycle bed materials. The whole system requires no addition of auxiliary fuel, and has the characteristics of safe reliability, no odor emission, low investment and operating cost, less secondary pollutant discharge, high power generation efficiency, etc.

The invention discloses equipment capable of automatically testing moisture of bituminous coal. The equipment comprises two main brackets, a bottom plate, a lower fiber plate, a hearth, an upper fiber plate, a turn plate, a rotating shaft, a secondary bracket, an elevating rack, a U-shaped rack, a motor rack, a rotating motor, two bearing brackets, a ball screw, a balance, a weighing lever, a guide block and a slide block, wherein the lower fiber plate is assembled on the bottom plate; the weighing lever is assembled on the balance. The equipment capable of automatically testing moisture of bituminous coal is high in automatic degree, high in work efficiency and convenient to operate.

The invention discloses a method for reclaiming zinc oxide in treating zincky powder dust in a rotary hearth furnace. The zincky powder dust, coal and flux are mixed, then are subjected to briquetting and drying, are transported to the rotary hearth furnace and are subjected to direct reduction; zinc in the powder dust is reclaimed from exhaust gas; and a feed block of which zinc is removed is directly reduced through the rotary hearth furnace and is subjected to cooling or briquetting for use. The method has wide applicability to zincky materials, can farthest utilize resource reasonably, has low requirement on the thermal value of fuels, high temperature of flue gas and high zinc extraction rate; and the treated powder dust is changed into direct reduced iron for comprehensive utilization.

The invention discloses a novel high-efficient comprehensive utilization method for recycling a waste lithium-ion battery, comprising three steps, namely a pretreatment step, a separation step and a vacuum thermal treatment step, wherein the pretreatment specifically comprises the following steps of: crushing the waste lithium-ion battery in a water medium by utilizing a shear type crusher, and peeling off positive-negative electrode materials from a polar plate; the separation step specifically comprises the following steps of: separating and recovering a polyethylene film or a polypropylene film, a plastic shell and the like floating on the surface of the water medium according to different densities of all components in the waste lithium-ion battery, filtering, treating the filtrate and recycling; and the vacuum thermal treatment step specifically comprises the following steps of: placing the nonconductor waste lithium-ion battery positive-negative electrode materials, namely lithium cobaltate and acetylene black obtained by the separation process, in a material boat or a hearth directly to carry out vacuum thermal treatment. The novel high-efficient comprehensive utilization method disclosed by the invention has the advantages of simple flow process and high recovery efficiency, no need of a reducing agent and no secondary pollution.

A robot MIG welding binocular vision sensing system in the technical field of automated welding equipment comprises two welding torch fixed sleeves, two sensor sleeve connection blocks, a furnace hearth observation module and a seam tracking module; wherein the furnace hearth observation module and the seam tracking module are respectively fixed on the respective welding torch fixed sleeve and are respectively connected with the two sensor sleeve connection blocks, the sensor sleeve connection blocks are arranged on the welding torch fixed sleeves in a rotary way, and the welding torch fixed sleeves are fixedly connected with an MIG welding torch. The invention obtains clear images by adjusting the angle between a sensor main module and the welding torch as well as the angle between a reflector assembly and the sensor main module, and ensures the welding quality by weld penetration control.

The invention relates to a method for measuring corrosion thickness, especially a method for measuring corrosion thickness of blast furnace lining, aiming to solve technical problems that the bull couple can not cover circumferential direction when being previously embedded in blast furnace hearth causing large limitation for calculating corrosion thickness of blast furnace hearth according to the couple detecting data. A method for measuring corrosion thickness of blast furnace lining, comprising: a, a temperature and flow rate sensor on the cooling wall collects and inputs data into a computer via an isolation baffle and an adaptor, reads flow temperature t<0> and heat flow intensity Q of each cooling wall from the cooling wall water temperature difference and heat flow intensity database, b, measuring the cooling wall heat side temperature according to Fourier formula: t<1>=Q*S<1>/lambda <1>+t<0>; c, measuring carbon brick cold side temperature: t<2>=Q*S<2>/lambda<2>+t<1>; d, measuring carbon brick heat side temperature: t<3>=Q*S<3>/lambda <3>+t<2>, determining position of blast furnace hearth iron solidification corrosion line at 1150 degrees centigrade, and finally surveying and drawing corrosion curve of blast furnace hearth at 1150 degrees centigrade. The invention can automatically measure blast furnace lining corrosion degree in each part of the blast furnace and draw the corrosion curve.

The invention discloses a combustion optimization control system based on acoustically-measured hearth temperature field, and a control method thereof. The system comprises a data acquisition device, a data processing device, an operating mode selector module, and an execution instruction output module. A coal quality processing module, a soot blowing mode processing module, an auxiliary air distribution mode processing module, a hearth temperature field data processing module, a hearth temperature field homogenizing module, a boiler auxiliary operating mode processing module, and a boiler coal mill commissioning mode processing module are packaged in the data processing device. The execution instruction output module comprises an oxygen adjustment module and a hearth temperature adjustment module. The combustion optimization control system based on acoustically-measured hearth temperature field and the control method thereof have the advantages that interior combustion conditions can be quickly and directly reflected by the hearth temperature field, the automatic adjustment combustion system comprehensively considering all combustion influencing controllable factors is established under the condition of reliable and accurate heart temperature field measurement, boiler combustion efficiency can be improved, and the boiler is safe, stable, economical and reliable in operation.

The invention provides a combined type multi-injector burner with a flammable powder body, which comprises an igniter burner positioned at the center of the burner and a plurality of process combustion nozzles which are evenly formed on the periphery of the igniter burner in the circumferential direction, wherein, each process combustion nozzle comprises a coal dust passage positioned at the center of each process combustion nozzle and a first annular oxidizer passage arranged outside the coal dust passage. In the combined type multi-injector burner, a plurality of process combustion nozzles and the igniter burner are assembled together, the structure is compact, and the combustion efficiency as well as the gasification efficiency are increased; the maintenance of each single process combustion nozzle is flexible, and the disassembly and the assembly are convenient; the process combustion nozzles can limberly adjust the load of the burner, mediums in a hearth can be mixed evenly through repeated impacts, the flame fullness degree is good, and a uniform multilayer cooling structure can protect the burner effectively and prolong the service life of the burner.

The invention relates to a three-dimensional unstable state monitoring and abnormity diagnosis and maintenance system of a blast furnace hearth, belonging to the technical field of online monitoring, diagnosis, prewarning and maintenance of the blast furnace. The three-dimensional unstable state monitoring and abnormity diagnosis and maintenance system of the blast furnace hearth comprises a data acquisition module, a data filtering module, a hearth and furnace bottom corrosion and accretion calculation module, an abnormality diagnosis module, a prewarning displaying module and a hearth-guiding and maintaining module. Water temperature of a cooling wall of the hearth and galvanic couple temperature of a furnace body can be collected and filtered in real time; by combining the two data together and using pro and con questions of the heat transmission science in combination with the standard of abnormity diagnosis, the influence of the abnormity possibly occurring in the production of the thermal conductivity coefficient variation of refractories, the ring shake, the air gap, and the like on distribution and corrosion of a temperature field is comprehensively judged, a gradient-regularization method and a chaos optimization method are combined to solve, the online monitoring on the three-dimensional unstable state temperature field of the hearth and the furnace bottom, the internal corrosion type, the slag-metal skull variation and the hot state of the hearth is realized, the abnormal circumstance and the corrosion deterioration causes are diagnosed in real time, and the hearth maintenance means is pertinently guided according to the corrosion deterioration causes. The system is successfully applied to industry.

The invention belongs to the field of nonferrous metal, in particular to a process and a device for treating decopperized slag by adopting a bottom-blowing molten pool to produce wet lead and raw copper. A bottom-blowing smelter hearth is utilized to smelt decopperized slag to produce wet lead, furnace slag and lead copper matte, ferrum-silico-calcium slag is produced in the smelting process, the furnace slag serves as building material factory raw materials after meeting the disposal slag requirements, and a bottom-blowing converting furnace is utilized to convert the lead copper matte to produce raw copper. The process has low energy consumption, long service life of the furnace, high metal recovery efficiency, low product cost, high smelting environment protectiveness , easy realization of automatic control of process, and high labour productivity; the disposal slag contains low-grade valuable metal, and therefore, the disposal slag can be comprehensively utilized as raw materials in building material industry, which accords with the recycling economy principle.

A mounting enclosure and an improved mounting arrangement for apparatus used in metal melting, refining and processing, particularly those apparatus adapted for steel making in an electric arc furnace, such as burners, lances and the like with supersonic oxygen lancing capability and injectors or the like for the introduction of particulate matter. The mounting enclosure is fluid cooled to survive the hostile environment of the electric arc furnace and is designed to occupy the step between the side wall and hearth of the furnace without any substantial change to the structure of the furnace. The mounting enclosure comprises a plurality of fluid cooling conduits surrounding an apparatus aperture and an injector aperture which are formed through the enclosure and adapted to mount an apparatus and an injector. The mounting arrangement includes utilizing the mounting enclosure to mount an apparatus with supersonic oxidizing gas lancing capability and an injector for particulate carbon in an electric arc furnace. Because the mounting enclosure is approximately the width of the step, the discharge openings of the apparatus and the injector are moved closer to the surface of the melt and toward the center of the furnace thereby providing increased efficiency. The discharge openings will now be extended to near the edge of the step so that the oxidizing gas flow pattern of the apparatus does not degrade the hearth material or other furnace equipment mounted nearby and the carbon flow pattern of the injector sufficiently agitates the slag to produce foaming.

The invention discloses a technique for comprehensively utilizing iron-containing dust mud, which is characterized by comprising the following steps: preparing iron-containing dust mud into blocks or balls by block pressing, ball pressing or balling, drying the ball or blocky red mud, adding the red mud into a rotary hearth furnace, carrying out ZnO removal, alkali metal removal and FeOx pre-reduction on the dust mud in the rotary hearth furnace technique, recovering ZnO from rotary hearth furnace flue gas, and pre-reducing to obtain the metalized pellet DRI; and adding the DRI generated from the rotary hearth furnace into a melting furnace to perform slag-iron separation, sending the separated molten iron into a steelmaking technique, and carrying out concurrent heating hardening and tempering on the dust mud molten slag separated from the metal, wherein the product can be used for producing cement, mineral wool, microcrystalline glass or other high-added-value silicate products. Thus, the technique enhances the comprehensive utilization efficiency of the whole iron-containing dust mud, and enhances the comprehensive utilization economic benefit of the iron-containing dust mud.

The invention discloses a method for combusting a fuel reburning low-nitrogen oxide and belongs to a clean combustion method for a coal-fired boiler. Secondary medium air is used as a powder conveying medium of a combustor on the upper layer of the main combustion area of the boiler, coal powder used as a reburning fuel is conveyed into the boiler, the secondary medium air is used as distributed air of the combustor, the secondary air of the combustor on the upper layer is reduced correspondingly, the distributed air in the reburning area is reduced correspondingly, low excess air combustion is formed, the distributed air in a hearth is not enough, and finally over fire air (OFA) complements the required air; and the mixed medium of air and fuel gas is used as the conveying medium of the coal powder of the combustor of the upper layer, and the coal powder with the conventional fineness is conveyed into the boiler from the combustor on the upper layer by using a coal mill and a powder making system and is re-burnt and denitrated, and is burnt out by OFA. The problem that the reburning fuel and the fuel gas are not mixed uniformly, the reduction time is short, and the denitration efficiency is low is solved, the original design working conditions of maximum continuous evaporation capacity of the boiler and the like are not influenced, transformation is easy to realize, and the running cost is low.

The invention disclosed a kind of low temperature coal dry distillating square stove which includes stove body, coal cup, dant-pushing machine and branch admixer. On the top of the hearth there is installed the gas collecting umbrella, inside the stove it is cavity structure; on the bottom of the cavity there are installed several rows of emitting gas walls, every row of emitting gas wall is parallel to the interval between two side umbrella of the gas collecting umbrella; the consecutive emitting gas walls are pedestalled by arch wall; on both sides of the emitting gas walls there are two branch admixer respectively; the bottom of the stove connects the dant discharging box, the bottom of which connects the dant leading slot; the bottom of the dant leading slot is dant-pushing machine, the bottom of which is aqua sealing slot, in the slot there is scraper machine. The invention adopts the heating scheme of endo-burnning and calor internus which can heat uniformly. The gas collecting umbrella and accessory coalbox can make the material and gas-collecting uniformly while the dant-pushing machine can make the product uniform. The advantage of the invention: it can bring into full play of the producing ability and decrease the investment as well as increase the benefits; besides, it is easy to operate, it needs less people and can be controlled automatically.

The invention relates to an ultra-low-NOx gas burner. The ultra-low-NOx gas burner comprises a central drum, a swirler, a gas gun group, a throat opening, a front panel and a shell; the swirler is arranged at a connector of the central drum, the throat opening and the shell are coaxially arranged on the periphery of the central drum, the gas gun group is composed of multiple inter gas guns, multiple middle gas guns and multiple outer gas guns, and the front panel is provided with opposite penetrating gas flow holes and outer gas gun nozzle containing holes; a central drum cavity is a center combustion-supporting air passage, an annular cavity between the central drum and the throat opening is a direct-current combustion-supporting air passage, and an annular cavity between the periphery of the throat opening and the shell is a cooling air passage; the inner gas guns and the middle gas guns are arranged in the direct-current combustion-supporting air passage, and the outer gas guns are arranged in the cooling air passage. In the working process, due to the fact that gas sprayed from the middle gas guns is transition gas, segmented configuration and staged combustion are achieved, sufficient combustion of the gas in the dispersed state can be achieved, the content of oxygen in a furnace hearth is effectively diluted, the emission amount of NOx is decreased to below 10 ppm, and CO is not generated.

A bedding carbonaceous material is charged onto a hearth of a rotary hearth furnace, carbonaceous-material containing pellets containing powdery iron ore and powdery coal are placed on the bedding carbonaceous material, and the hearth is caused to pass inside the rotary hearth furnace to heat and reduce the carbonaceous-material containing pellets to solid reduced iron and to heat and dry the bedding carbonaceous material by distillation into char. Subsequently, the solid reduced iron and the char are charged into an iron-melting furnace without being substantially cooled, and an oxygen gas is blown into the iron-melting furnace to melt the solid reduced iron, thereby obtaining molten iron. At least a part of an exhaust gas from the iron-melting furnace is used as a fuel gas for the rotary hearth furnace after being cooled and having dust removed.

The present invention discloses a compact parallel connection type external fluidized bed heat exchanger, and relates to a fluidized bed heat exchange technology. The compact parallel connection type external fluidized bed heat exchanger comprises a material inlet, a material dispenser, two heat exchange chambers arranged in a parallel connection manner, and a material returning chamber. According to the compact parallel connection type external fluidized bed heat exchanger of the present invention, a pneumatic way is adopted to precisely control the amounts of circulating ash entering the two parallel heat exchange chambers, such that independent adjustments and controls of heat exchange powers of the two heat exchange chambers according to requirements can be achieved; with arrangement of the two heat exchange chambers in the parallel connection manner, heat exchange of the two heat exchange chambers has high heat transfer temperatures and high heat transfer pressures, such that a heat exchange efficiency between high temperature circulating particles and the heat exchange pipe bundles is improved while uniformity of the returned material of the large-size hearth and stability of the bed temperature are improved; and with the compact integration design, structure arrangement and operation adjustment of the large circulating fluidized bed boiler are flexible.

A method and apparatus for alternating pouring into molds, casts or refining hearths from a common hearth in a furnace. The apparatus provides a main hearth, a plurality of optional refining hearths, and a plurality of casting molds or direct molds whereby the refining hearths and molds define at least two separate ingot making lines. The main hearth alternatively pours into a first ingot making line while the other line is prepared, and vice versa allowing for continuous melting.

The invention provides a multistage over fire air distributing mode. The mode comprises a primary air pulverized coal nozzle, a secondary air nozzle, main burners, low separating over fire air bellows and high separating over fire air bellows, wherein a group of the main burners is arranged at each corner of a hearth; the separating over fire air is divided into low separating over fire air and high separating over fire air; the low separating over fire air bellows are arranged at four corners of the hearth or on four walls; and the high separating over fire air bellows are arranged at the four corners of the hearth or on the four walls. The distributing mode can realize NOx low emission based on NOx effect of between 250 and 650mg/m3 controlled by integral air classification technology in the current combustion bituminous coal and meager coal furnace (oxygen concentration in smoke is 6 percent.) so as to reduce the generation amount of NOx by about 15 percent. The equipment solves the problems of high combustibles in fly ash caused by the integral air classification technology in the furnace, large difference between speed and temperature of smoke at the outlet of the hearth and the like, and improves the operation regulating performance on different coal varieties and load changes.

The present invention belongs to the combustion controlling technology of boiler hearth, especially of multiple fire nozzle hearth, and is suitable for the combustion monitoring of combustion in a four corner-rounded boiler. The present invention relates optimized efficient low nitrogen oxide exhaust control by arranging several flame image detectors to obtain the 3-D temperature distribution in hearth and through fitting the expression between radiation energy E and power generating load NE of the poer set, measuring the flame center height and the change rules of flame section temperature center with fuel amount and blast distribution proportion in different layers and different corners, and giving control command of fuel amount and blast distributino proportion in different layers and different corners according to boiler load, fuel amount and blast amount.

The present invention is an apparatus and method for the direct reduction of iron oxide utilizing a rotary hearth furnace to form a high purity carbon-containing iron metal button. The hearth layer may be a refractory or a vitreous hearth layer of iron oxide, carbon, and silica compounds. Additionally, coating materials may be introduced onto the refractory or vitreous hearth layer before iron oxide ore and carbon materials are added, with the coating materials preventing attack of the molten iron on the hearth layer. The coating materials may include compounds of carbon, iron oxide, silicon oxide, magnesium oxide, and/or aluminum oxide. The coating materials may be placed as a solid or a slurry on the hearth layer and heated, which provides a protective layer onto which the iron oxide ores and carbon materials are placed. The iron oxide is reduced and forms molten globules of high purity iron and residual carbon, which remain separate from the hearth layer. An improved apparatus includes a cooling plate that is placed in close proximity with the refractory or vitreous hearth layer, cooling the molten globules to form iron metal buttons that are removed from the hearth layer. The improvements due to the present apparatus and method of operation provide high purity iron and carbon solid buttons, which are separate from slag particulates, and discharged without significant loss of iron product to the interior surfaces of the furnace.

The invention discloses a monitoring method and an optimal control method for supercritical circulating fluidized bed (CFB) boiler combustion signals. The monitoring method comprises the following steps of: step 1, acquiring and pre-processing field data, and determining an auxiliary variable of an instant combustion carbon quantity model; step 2, building the instant combustion carbon quantity model based on mechanism modeling and data analysis hybrid modeling, and estimating the storage amount of instant combustion carbon in a hearth through a generalized Kalman filter information fusion technology, wherein the instant combustion carbon quantity model is shown in the description; and step 3, building a dynamic heat signal model, a hearth bed temperature signal model and a hearth outlet oxygen signal model through the instant combustion carbon quantity, and predetermining heat, bed temperatures and oxygen. The methods provided by the invention can accurately measure signals of heat, bed temperatures, oxygen and the like of a supercritical CFB boiler in real time, so that the optimal control on supercritical CFB boiler combustion is realized, and the combustion stability of the supercritical CFB boiler is improved.

The present invention relates to a method of using a rotary hearth furnace to deoxidize the ore concentrate pellets containing carbon and vanadium and titanium and iron for producing iron powder and joint titanium slag and vanadic oxide. The vanadium and titanium and iron ore concentrate is made into pellets positioned in the rotary hearth furnace for deoxidizing and then crashing, after the wetmilling, the crashed pellets are dressed by the magnetic separation and reelected to get the iron powder and the mine tailing, which is lixiviated by titanium dioxide waste acid to remove the titanium slag and the sodium vanadate solution, at last, the sodium vanadate solution is added with sodium salt to sink vanadium, and calcinations to remove ammonia, thereby getting the vanadic oxide product. The present invention eliminates the shortcomings that the fusion energy consumption of the electric furnace is high, the separation effect of vanadium and titanium is bad, the run of vanadium and titanium is difficult to control, and the yield of extracting vanadium and titanium from the molten iron blown in the rotary hearth furnace is low. The present invention has the advantages of high yield of vanadium and titanium and iron and high utilization rate of resources, and develops a doable new route for the comprehensive utilization of the vanadium and titanium and iron ore concentrate.

The invention provides a laterite-nickel ore processing method for efficiently recovering nickel resources, which can save the early pellet processing cost and improve the recovery rate of nickel. The method comprises the following steps of: (1) laterite-nickel ore classification: breaking and screening the laterite-nickel ore; adding the reducing coal and fluxing agent into the laterite-nickel ore larger than 2mm and directly feeding into a rotary hearth furnace; adding the reducing coal and fluxing agent into the laterite-nickel ore smaller than 2mm and pressing into carbon-containing pellets by a pellet press; and drying the carbon-containing pellets and feeding into the rotary hearth furnace; (2) pre-reduction: feeding the carbon-containing pellets into a heat-accumulation type coal-based rotary hearth furnace, and performing high-temperature quick reduction in the furnace, wherein the reduction temperature is 1,200-1,300 DEG C, and the reduction time is 20-45 min; (3) melting: feeding the discharge product of the rotary hearth furnace into the melting equipment for slag iron separation to produce nickel-iron alloy; and (4) levigation sorting and melting: breaking the melting slag obtained by the step (3), performing ore grinding magnetic separation, and returning the metal iron powder after the magnetic separation to the melting equipment of the step (3) for slag iron separation to obtain the nickel-iron alloy.

The invention provides a combustion optimization system and adjustment method for preventing water wall high-temperature corrosion. The combustion optimization system comprises air and pulverized coal adjustment devices, secondary air distribution adjustment devices, two water wall near wall region smoke component measuring devices, a plurality of auxiliary over fire air nozzles, a temperature field measuring device and a coal economizer outlet smoke oxygen content field measuring device. A first air and pulverized coal pipeline corresponding to each combustor is provided with the corresponding air and pulverized coal adjustment device. Each secondary air box is internally provided with the corresponding secondary air distribution adjustment device. The two water wall near wall region smoke component measuring devices are separately mounted on the water wall on the two sides of a boiler. The multiple auxiliary over fire air nozzles are separately arranged below over fire air nozzles. The temperature field measuring device is arranged on the portion, below a platen overheater, in a hearth. The coal economizer outlet smoke oxygen content field measuring device is arranged at a coal economizer outlet flue. By adoption of the combustion optimization system, high-temperature corrosion to the water wall of the opposite cyclone combustion boiler can be effectively relieved.

The invention discloses a device and a method for disposing low and medium-radioactivity solid waste by hot plasmas. The device comprises a plasma melting gasification furnace, a hot plasma generator, a working gas preparation supply device, a cooling water supply device, a feeding device, a glass solidified body discharging and receiving device, a tail gas purification treatment device and corresponding measuring, controlling and monitoring systems. Organic and inorganic carbonaceous compositions in the waste are gasified by the hot plasmas in a low-temperature area of a hearth, generated ash and inorganic substances in the waste are melted in a high-temperature area of the hearth, added glass organizers are regulated so that radioactive nuclides are stably fixed in glass organizers, and flue gas meets emission requirements of air quality standards after being subjected to purification treatment. Besides, the device and the method for disposing the low and medium-radioactivity waste are environment-friendly, a disposal process is safe and reliable, disposal storage space for radioactive waste can be greatly reduced, national emission standards are met, and the purpose of minimized and stabilized disposal for the radioactive waste is achieved.

Disclosed is a stable-combustion slagging resistant slit W-type flame boiler device which relates to a W-type flame boiler combustion device. The invention solves the problems of unreasonable combustion organization, easy slagging in the lower hearth and the bad stability of the pulverized coal airflow flame found in the slit W-type flame boiler in the prior art. The front arch and rear arch (3) of the invention are provided with a primary air spout (9), an exhaust spout (10), a secondary air spout (11) and a slagging resistant secondary air spout (12); the primary air spout (9) is arranged on the front and the rear arch (3) close to the central side of the hearth; the secondary air spout (11) and the primary air spout (9) are arranged alternately; the slagging resistant secondary air spout (12) is arranged on the front arch and the rear arch (3) close to the water cooling wall side of the front wall and the back wall and is arranged on the same side where the primary air spout (9) is arranged; the exhaust spout (10) is arranged between the primary air spout (9) and the slagging resistant secondary air spout (12); a combustor spout is distributed through the hearth center (2-1) as the symmetrical surface. The stable-combustion slagging resistant slit W-type flame boiler device has the advantages of reasonable combustion organization, reducing the slagging of the lower hearth and good stability of the pulverized coal airflow flame during the operating process of the slit W-type flame boiler.

The invention discloses a gas stove with kitchen ventilator. The up part of the stove cabinet connects kitchen ventilator, and the back is connected to heat storage barrel, heating barrel, water intake main pipe, refrigerant gas intake pipe, gas returning pipe and hot water outlet pipe. The front of the casing connects with kitchen stove air condition and wind selection key, exhaustion box and operation key. The middle part of the stove cabinet connects to hearth evaporator. The gas stove is located under the stove evaporator. A four gates refrigerator is connected to the down part of the stove cabinet. The invention has multifunction of oil pumping, water heater, kitchen use air condition, fuel gas range and refrigerator. It can use the remaining heat to gain hot water. And it also solves the odor tainting problem of the refrigerator and makes the kitchen use household electric appliances take up small space and low energy consumption.