1219 results about "Hot air oven" patented technology

The invention provides a high-temperature resistant environment-friendly polyvinyl chloride material for wires and cables. A raw material formulation mainly comprises the following materials in weight portion: 80 to 120 portions of loose-type polyvinyl chloride resin, 20 to 55 portions of tetraoctyl pyromellitate, 5 to 35 portions of polyester plasticizer and 12 to 18 portions of calcium-zinc stabilizer, wherein the polymerization degree of the loose-type polyvinyl chloride resin is between 2,000 and 3,000; in the calcium-zinc stabilizer, the total content of lead, cadmium, mercury and hexavalent chromium is less than or equal to 10 ppm of the total weight of the calcium-zinc stabilizer; the polyester plasticizer is polypropylene-1, 2-glycol adipate or polypropylene-1, 3-butylene terephthalate; and the molecular weight of the polyester plasticizer is between 3,000 and 4,000. After the material is aged in a hot-air oven for 168 hours at 158 DEG C, the retention rate of tensile strength is up to 106 percent; the retention rate of elongation at break is 97 percent; and the material is good in mechanical physical properties and insulating property. Therefore, the material meets the temperature-resistant requirement on long-term operating temperature at 125 DEG C in UL1581.

The invention discloses a method for innocent treatment and resource utilization of industry byproduct waste salt slag. An innocent treatment system is composed of a hot air furnace, a multi-layer round disk pyrolyzing furnace which is provided with a heating device and a waste heat boiler. The waste salt slag is continuously added into the uppermost layer of round disks of the pyrolyzing furnace from the top of the pyrolyzing furnace, materials move from top to the bottom and are transferred to the bottom of the pyrolyzing furnace through the multi-layer round disks to be discharged, the heating temperature in the pyrolyzing furnace is 300-600 DEG C, the staying time of the materials is 4-10 hours, organic harmful impurities in waste salt are decomposed into volatile exhaust gas by means of heat decomposition when being heated, the exhaust gas is introduced to the hot air furnace to be calcined at a high temperature, and smoke which is heated in a mode that a heat source is recycled and reutilized through the waste heat boiler. The method for the innocent treatment and the resource utilization of the industry byproduct waste salt slag enables poisonous harmful chemical substances in the industry byproduct waste salt slag to be decomposed into the volatile gas, the chemical substances can be effectively separated from solid salt, so that the innocent treatment is achieved, secondary pollution can not be generated, the smoke generated in the hot air furnace can be recycled and utilized, salt after being processed by the innocent treatment can be used as resources such as industrial raw salt, building material additives and snow-melting agent.

Disclosed is a high efficiency hot air furnace including a heat exchanger assembly located in a heat exchange chamber through with comfort air is passed to be heated. The heat exchanger assembly includes a drum like combustion member located in the flow path of comfort air. A supplemental heat exchanger or condenser is disposed in the flow path of comfort air upstream from the combustion member. A transfer channel extends from one end of the combustion member and communicates combustion products to the condenser. The combustion member includes an insulating material on the inside portion of the cylindrical wall. A diffuser is located within the combustion member which prevents the burner flame from extending into the transfer channel. The burner includes a blower for urging combustion gases through the heat exchanging assembly. Intake air for the blower is provided by an air intake chamber.

The invention relates to a device and method for top gas enrichment utilization of a blast furnace, in particular to a device and method for using top gas in a blast furnace production process, belonging to the field of smelting pig iron with the blast furnace. The device is characterized in that: a tee joint is arranged on a pipeline between a gas purifying and de-dusting system and an excess pressure power generation device; a gas pressurization device, a gasification furnace and a gas back-eject hole which is formed on the blast furnace are connected through the pipeline and a valve to form one way of the tee joint; the gasification furnace is provided with an oxygen supply pipeline and a coal blending device; the enriched gas, after being pressurized, enters the gasification furnace and is subjected to gasification reaction with oxygen and powder coal in the pressurized gasification furnace; a reaction product is ejected into the blast furnace for smelting iron through the back-eject hole which is formed on the blast furnace; the excess pressure power generation device is respectively connected with a hot blast heater, a power plant boiler pipeline and a valve through a gas distributor to form another way of the tee joint; and the generated hot air is fed into the blast furnace through a nozzle. The device has the advantages of novel conception, simple process flow, easiness in implementation, safety and reliability in operation and capabilities of increasing the calorific value of gas, ejecting back to smelt iron, increasing the indirect reduction rate, reducing the coal ratio, reducing blast furnace slag and CO2 emission, regulating and controlling the width of a cohesive zone of the blast furnace, ensuring long-term smooth running of the blast furnace, avoiding diffusion of the top gas, saving energy and contributing to environment friendliness.

The invention discloses a system for fluidized oxidizing / reducing roasting modification of titaniferous iron concentrate and a roasting process. A fluidized bed oxidation reactor is adopted for the oxidizing roasting of titaniferous iron concentrate powder, and fluidized air is preheated by a hot blast heater and mineral powder is preheated by a multistage cyclone preheater so as to provide heat for oxidizing roasting; the oxidized mineral powder enters the fluidized bed reduction reactor for reducing roasting, and heat is provided for the reducing roasting through heating coal gas by a coal gas preheater; and latent heat of unreacted reducing gas in roasting tail gas of the reduction reactor is firstly released through combustion in a combustion chamber, one path of hot flue gas after the combustion is mixed with the tail gas of the oxidation reactor and then enters the multistage cyclone preheater to exchange heat with the cold titaniferous iron concentrate powder, heat is recycled while the titaniferous iron concentrate is preheated, and the other path of hot flue gas is used for preheating cold coal gas to warm the fluidized coal gas entering a reducing furnace so as to strengthen a reducing condition. The system has the advantages of high oxidizing / reducing efficiency, high heat utilization efficiency in a roasting process and the like.

The invention discloses a method and a device for the heat supply a rotary hearth furnace. Smoke afterheat generated by the rotary hearth furnace is firstly heated up through a rear combustion chamber to 1300 DEG C and then respectively introduced into a ball-type hot blast furnace and a fire tube-type rotary dryer which are interconnected in parallel, double preheating and staged heat exchange of the fuel for gas generator and the combustion-supporting air are realized by means of the coordinative operation of combined afterheat utilization devices which are mutually connected, such as ball-type hot blast furnace, heat pipe exchanger, fire tube-type rotary dryer and the like, thus the temperature of combustion flame at a combustion nozzle of the rotary hearth furnace is guaranteed to be not less than 2200 DEG C and drying iron ore powder is performed while high temperature reduction is implemented. The novel high-temperature smoke afterheat recycling technology of the rotary hearth furnace is especially suitable for plants in the area without natural gas and coke-oven gas which require coal-based direct reduction rotary hearth furnace to generate high reduction temperature ranging from 1300 to 1400 DEG C, the technology is advanced, the economical benefit is considerable, the top-quality fuel is saved, the expenditure for cooling high temperature smoke is avoided, and the CO2emission and the production cost are lowered.

The invention provides a method and a device for the drying and the quality enhancement of lignite. The device comprises a drying / sieving device, a preheating and drying / sieving device, a hot blast heater, a drying drum, a vibration fluidized bed, a cyclone separator, a defogger and a dust remover. The hot blast heater is respectively connected to the drying drum and the vibration fluidized bed, and an outlet of the preheating and drying / sieving device is respectively connected with the drying drum and the vibration fluidized bed. The preheating and drying / sieving device divides the lignite into two stages of big particle diameter and small particle diameter, high-temperature flue gas generated by the hot blast heater is used as a heating medium, the temperature of the flue gas is regulated by the residual low-oxygen gas after oxygen gas is separated by using an air separation system, the drying drum and the vibration fluidized bed are used for producing the quality-enhanced lignite with the big particle diameter and the small particle diameter, different production requirements are met, and part of exhausted tail gas is circularly used for preheating the raw materials of the lignite after being defogged. The invention respectively carries out drying and quality enhancement on the lignite according to the sizes of the particle diameters by grading equipment, eliminates the problem of uneven drying caused by different particle diameters, realizes the effective quality enhancement and the comprehensive utilization of coal resources, and is used for the large-scale process of drying and quality enhancement of the lignite.

An oxygen blast furnace iron-making method based on cold-bonded carbonic pellet belongs to the blast furnace iron-making field. The oxygen blast furnace iron-making method based on cold-bonded carbonic pellet is characterized in that 70 to 100 percent of carbonic pellet and 0 to 30 percent of sintered ore are adopted as materials for iron-making and added to a blast furnace from the top of the blast furnace; coke and coal injection are adopted as fuel of the blast furnace, wherein each ton of iron consumes 200 to 250kg / t HM of coke; the carbon content of the carbonic pellet is 1 to 20 percent and TFe content is 50 to 65 percent; mean compressive strength of the carbonic pellet is 1000 to 2000N / each; the carbonic pellet is subjected to an automatic reduction process in the blast furnace so as to change gas-phase partial pressure of reduction reaction and reduce coke load of the blast furnace; simultaneously, oxygen of normal temperature is injected through a blast-furnace tuyere to displace the traditional air heating furnace; the applied amount of oxygen is 200 to 500 Nm / t HM; coal gas with high heating value (7000 to 8000KJ / Nm) can be provided outward by the blast furnace, and the coal gas generated by the blast furnace can be recycled after going through a dust-removing and pre-heating device and then is respectively injected into the blast furnace from the blast-furnace tuyere and the lower part of the blast furnace body; the theoretical combustion temperature of the method provided is controlled to be between 1900 and 2300 DEG C; and the coke ratio of the oxygen blast furnace iron-making method can be reduced to 200 to 250 kg / t HM, and the coal ratio is above 200 to 300 kg / t HM.

The invention relates to an intelligent temperature adjustment textile and a making method thereof. The intelligent temperature adjustment textile is obtained through wrapping a phase change microcapsule by a coating adhesive, and coating the surface of a textile fabric. The above coating comprises 30-35wt% of the phase change microcapsule, 20-40wt% of an emulsion, 0.2-2wt% of a dispersant, 0.1-1wt% of an antifoaming agent, 2-8wt% of a thickener, 0.1-0.5wt% of a net removal agent and 20-30wt% of deionized water. The method comprises the steps of beating, pre-finishing, coating, baking and cooling rolling. The phase change material adopts the phase change microcapsule, so no oil immersion like negative effects of the fabric do not appear during endothermic melting; the textile adopting pint-like uniform coating has soft handle and good ventilating performance; and the temperature of a last stage hot air oven is controlled in a range of 150-180DEG C, so a cross-linking reaction of maleic anhydride and the phase change material is carried out, thereby the intelligent temperature adjustment textile coating has good fastness and water washing resistance.

The invention discloses a tea enzyme denaturing method and a device thereof. Under the pressure free state, hot air is introduced in an enzyme denaturing container, high temperature steam is mixed in hot air in an adjustable method, and the mixed medium of hot air and high temperature steam is utilized for completing the enzyme denaturing. In the enzyme denaturing device, an enzyme denaturing component and a hot air furnace component are communicated by a pipeline, one end of a steam output pipe of a steam generator is fixedly connected on a pot body, and the other end of the steam output pipe is in sealing communication with a ventilation pipeline. A steam spraying pipe is arranged on an output pipe opening of the steam output pipe, the front end of the steam spraying pipe is bent, and the direction of a steam outlet of the bent steam spraying pipe is identical to that of air in the ventilation pipeline. In the invention, the new tea enzyme denaturing medium is utilized for solving the technical difficulties that tea in the summer and autumn is fresh to have low water content, so that the tea is easy to denature excessively, and explode, furthermore, the tea can not be processed by the original dry hot air or heat conduction caused by air contact, and for the enzyme denaturing by taking the pure steam as the medium, and more water is added, so that the subsequent dehydration is difficult, more energy and time are consumed, and the process is complicated.

The invention relates to a sludge treatment system and treatment process, and belongs to the technical field of water treatment. The process comprises the following steps: stabilizing the quality and quantity of sludge through a sludge thickener; feeding into a sludge conditioner, and throwing a conditioner to perform wall breaking treatment on the sludge; feeding into a high-pressure mechanical plate and frame filter press, and performing pressure filtration until the water content is 55-60%; feeding into a sludge drying furnace, and performing indirect heat exchange through low-temperature fume produced by a sludge charring furnace until the water content of the dewatered sludge to dried to 10% or below; and feeding into the sludge charring furnace, and pyrolyzing the dried sludge through high-temperature fume produced by an incineration hot-blast furnace to produce biochar and tail gas, wherein the tail gas produced by the sludge drying furnace and the sludge charring furnace is fed into a tail gas purification tower for purification and separation, the produced combustible gas and waste oil are fed into the incineration hot-blast furnace for incineration, and the biochar is comprehensively utilized. According to the invention, sludge from a sewage treatment plant can be treated economically and efficiently, thereby realizing comprehensive utilization of the sludge from a sewage treatment plant.

The invention discloses a terylene fiber fabric water-washing-free continuous padding dyeing method. The terylene fiber fabric water-washing-free continuous padding dyeing method comprises following steps: a disperse dye, a thickening agent, a fiber swelling agent, an organic solvent, a color fixing agent, and a softening agent are uniformly mixed with water via stirring so as to obtain a dyeing working solution; terylene fiber fabric is subjected to padding in the dyeing working solution; after padding, the terylene fiber fabric is subjected to infrared ray predrying, hot air oven predrying, baking, and cropping so as to complete continuous dyeing of terylene fiber fabric. According to the terylene fiber fabric water-washing-free continuous padding dyeing method, the dyeing working solution of the disperse dye and corresponding dyeing process and conditions are combined, so that full dyeing and color fixing of terylene fiber is realized, reduction clearing, soaping, and water washing post-treatment in conventional dyeing process are avoided, a plurality of dyeing performance indexes of the fabric are ensured, technical process is shortened, production efficiency is increased, production cost of enterprises is reduced, economic benefit is increased, and dyeing waste water discharge is reduced.

The invention relates to a non-woven feather fiber filtering composite material and a preparation method thereof, comprising: a layer of non-woven feather fabric (3) and two layers of non-woven unbound fabric (4), which are all compounded by machine; and the preparation method comprises steps as follows: (1) feather fiber (1) and bi-component fiber (2) are mixed evenly according to a mass proportion of 1-2.5:1 and fed into a air-laid web-forming machine to obtain a non-woven feather fiber web (9) which is then directly fed into a needle machine to be reinforced by needling and a fiber web (21) is obtained; and (2) the fiber web (21) directly enters a hot-air oven to be reinforced by hot melting and a non-woven feather fabric (3) is obtained, and the non-woven feather fabric (3) is compounded up and down with a layer of non-woven unbound fabric (4) and then wound into shape by a winding device to obtain the non-woven filtering composite material (5). The non-woven filtering material has good uniformity, no fiber loosing, certain degree of tensile strength and tearing strength and good filtering performance, can adsorb heavy metals, dyes, oil stains, organic solvents and other harmful substances, and the preparation method is simple.

The invention relates to a high-temperature and low-energy-consumption running state estimation and optimization method for a hot air furnace system. The high-temperature and low-energy-consumption running state estimation and optimization method comprises the following steps of: a, setting a preset running estimation index of the hot air furnace system; b, acquiring real-time monitored running state data of the hot air furnace system; c, quantifying the monitored data, and determining the on-line heat efficiency and the coal gas self-consumption rate of the hot air furnace and the hot air temperature; d, determining the degradation degree and the degradation grade of the hot air furnace system according to a difference between a theoretical extreme value of the index and an on-line monitored actual value; e, determining the type of sensitivity parameters influencing the optimization of the hot air furnace system; and f, optimizing the hot air furnace system according to optimized sensitivity parameters and a corresponding technical scheme called from a technical scheme library according to the type of the sensitivity parameters. According to the high-temperature and low-energy-consumption running state estimation and optimization method, estimation, forecasting and optimization for the production running state of the hot air furnace system are integrated, the running state of the hot air furnace system can be estimated, whether the hot air furnace system runs in a high air temperature and low energy consumption state can be judged, and a scientific and effective technical scheme is supplied to the low-energy-consumption and high-efficiency running of the hot air furnace system.

A corundum fireproof ball used for a ball-type hot-blast stove and a preparation method thereof are characterized in that the corundum fireproof ball comprises the following main materials, adhesive and additive, wherein the main materials comprises the following raw materials by weight percentage: 0-15% of corundum (granularity of 5-3mm), 30-60% of corundum (granularity of 3-1mm), 5-30% of corundum (granularity of 1-0.088mm), 0-10% of corundum (granularity less than 0.044mm), 10-25% of bauxite chamotte (granularity less than 0.088mm), 2-10% of Alpha-Al2O3 grain, 1-10% of zirconia-contained material, 2-8% of clay and 2-10% of mullite or materials containing mullite which is taken as main phase; the adding amount of the adhesive is 1-6% of the weight of the main materials; and the adding amount of the additive is 0-1% of the weight of the main materials. The preparation method comprises the following steps of ageing mixture, back-rolling, pressing and molding, drying billet, and sintering in a tunnel kiln and the sintering temperature is within 1450-1600 DEG C.

The invention discloses a grain drying apparatus, which comprises the following parts: a double layer heat-preserving steel board storage with side-to-side cylindrical shape, a hot-blast stove for providing the hot blast, a smoke cleaning and heat-recovering device, a delivery blast pipeline, an air stream direction changer, an electric fan and an electric control distribution system. The invention is characterized by the following: blowing the dried air in the got-blast stove by the positive pressure electric fan; entering the diffusing blast pipe by delivery blast pipe; inflowing the grain draught; absorbing the grain liquid-vapor by the negative pressure electric fan in the delivery blast pipe through the diffusing pipe; converting the air current direction timely by the air double-acting direction-change valve; converting the original delivery blast pipe of the grain storage air to the delivery blast pipe of discharging the wet air; making the air change the direction and flow in the storage. The device has the good drying effect, the simple structure, the low cost, which produces the good quality grain, and is fit for the different size grain processing mill.

The invention relates to a treatment and utilization method for sintering flue gas. The method comprises the steps that dedusted sintering flue gas is heated through a hot blast heater, and the flue gas is heated to the temperature of 1000 DEG-1400 DEG C; heated flue gas is blown into a blast furnace through a blast-furnace tuyere to replace air for ironmaking production; high-temperature and highly reduced conditions in the blast furnace are utilized for conducting desulfuration, denitration and dioxin and furan removal on the sintering flue gas; and sensible heat in the flue gas and oxygen, carbon dioxide and carbon monoxide in the flue gas are utilized in ironmaking production. Compared with other sintering flue gas treatment techniques, the treatment and utilization method utilizes existing ironmaking production equipment for treating the sintering flue gas, the running cost is low, no new secondary products are produced, the latent heat of the sintering flue gas can be utilized, and carbon dioxide and carbon monoxide in the flue gas are caught and utilized.

The invention relates to a high-strength high thermal-shock-resistance low-aluminium mullite brick, which comprises the following components in percentage by weight: 15-50% of raw material sintered mullite, 5-15% of electric melted mullite, 10-40% of superfine flint clay, 10-30% of sillimanite, 10-30% of andalusite, 2-10% of activated alumina, 2-15% of zirconite, 2-12% of silica and 3-10% of bond clay. The high-strength high thermal-shock-resistance low-aluminium mullite brick provided by the invention made from the above raw material components has the advantages of high refractoriness under load (larger than or equal to 1500 DEG C) and heated volume stability, high thermal-shock resistance (larger than or equal to 50 times under water cooling at 1100 DEG C), low creep rate (smaller than or equal to 0.15 in 20-50 hours), good compressive strength (larger than or equal to 70Mpa), good volume stability and low impurity content at high temperature and the like; and at the same time, the CO corrosion resistance of the product provided by the invention is unaffected, so that the product provided by the invention can meet the use requirements of the medium and large blast furnace hot blast stove and other high-temperature kilns.

The invention relates to a preparation method of melt spun high-strength high-modulus polyvinyl alcohol fibers. The method comprises the following steps of: mixing polyvinyl alcohol and water uniformly for fully swelling; adding the fully swollen polyvinyl alcohol to a double screw extruder for full fusion and then extrusion, and the fused mass trickle is subjected to air blast cooling to form nascent fibers; and the obtained nascent fibers are subjected to drying by a hot-air oven, multistage drawing and tension heat setting to form polyvinyl alcohol fibers. The preparation method of polyvinyl alcohol fibers provided by the invention has the beneficial effect that as only water is used for plasticization, through hydrogen bond complex formed between water molecules and polyvinyl alcohol molecules, melt spinning and high stretching of polyvinyl alcohol are achieved; the polyvinyl alcohol fibers with excellent mechanical property are prepared from general-grade polyvinyl alcohol; relevant complex process steps of coagulating bath and the like in the traditional wet spinning method are not needed, the production process is simple, and environmental pollution is small, and the production cost is low. The polyvinyl alcohol fiber prepared by the method has the advantages of controllable fiber number, high strength and high modulus, and the fibers can be widely applied to the field of civil work concrete.

The invention discloses a PTFE (Polytetrafluoroethylene) low-shrinkage crimped chopped fiber for a filter needled-punched felt and a manufacturing method of the PTFE low-shrinkage crimped chopped fiber. The manufacturing method comprises the following steps of: preparing, mixing, fueling, curing, compacting, extruding, calendaring, rolling, depositing, unreeling, deoiling, sintering, drafting, film-splitting, carding, high-strength variable-speed crimping, hot-air oven sizing, natural annealing of air and cutting-off. According to the invention, by the adoption of the low shrinkage which is achieved after the mechanical crimping under a thermal state and the thermoforming of fibers, the cohesive force among the fibers is enhanced, and thus convenience is provided for the carding and the felting of a rear channel.

The present invention provides a heating cooking device, the hot air blown from a hot air circling unit can be evenly circled in a oven body and seek to equalization heating distribution. In order toheat the food contained in the oven body (2) by the hot air oven, the heating cooking device has a hot air circling unit comprising a hot air heater (7) and a hot air fan (6), wherein a curve shape portion (S) having a depressed inner side is arranged at least one of peripheral surface of the peripheral surfaces of the oven body (2) blowing hot air from the hot air circling unit.

Disclosed is a precise temperature control type heat pump hot blast heater control system and control method. A temperature detection unit, a constant temperature adjusting unit and an air supply unitare arranged in the control system. According to the control system, hot air matched with the set temperature is supplied in from the air supply unit through cooperation of the temperature detectionunit and the constant temperature adjusting unit. According to the precise temperature control type heat pump hot blast heater control system and control method, aiming at the particularity of operation of a grain drying heat pump system, when a heat pump hot blast heater is in various change working conditions such as change of the external environment temperature, change of heat pump inlet air temperature, fin frosting and defrosting, through innovative design and intelligent control logic of the control system, input selection of multilevel different heating capacities and precise control direct current frequency conversion adjusting system are achieved, the effect that difference value of the outlet air temperature of the heat pump and the set temperature is controlled and maintained to be within the range of + / -0.3 DEG C is ensured when the heat pump operates normally, and quality and the drying amount of dried material are ensured.

A process for internally cooking food includes the steps of injecting a condensable cooking fluid into the interior of the food at a plurality of spaced-apart locations, dispersing the cooking fluid within the interior, and condensing the cooking fluid while in direct contact with the interior. The heat of condensation of the cooking fluid releases considerable heat energy useful for either pre-cooking the food to a desired intermediate cooking level, or thoroughly cooking the food. The heat of condensation of the fluid is high enough that only a small amount of condensable cooking fluid is required, per quantity unit of food being cooked. As a result, the food does not become excessively loaded with cooking fluid, and flavorants such as marinade substantially remain within the food. Where the condensable fluid is used for pre-cooking, the cooking may be thoroughly completed by placing the pre-cooked food in a conventional hot air oven. The pre-cooking or thorough cooking of food using properly injected condensable cooking fluid, considerably reduces the total cooking time compared to conventional oven cooking.

The invention discloses an air oven. The air oven comprises a box assembly (1) in which a heating chamber (100) is formed, thermal insulation chambers (200) are formed in both sides of the box assembly (1), a heating pipe assembly (4) is arranged on the top of the heating chamber (100), the top of the box assembly (1) is fixedly connected with a lining pan (2), the top of the lining pan (2) is connected with a top cover (20), and two partition plates divide the interior of the lining pan (2) into three chambers; a fan motor assembly (3) is arranged in the upper chamber (300), an exhaust fan (31) is arranged in the middle chamber (400), a circulation fan (32) is arranged in the lower chamber (500), an air via hole (24) is formed in the partition plate between the upper chamber (300) and themiddle chamber (400), and thermal insulation is achieved between the middle chamber (400) and the lower chamber (500); an air blowing hole (29) is formed in the bottom of the lining pan (2), and a first through hole (26) and a second through hole (28) are formed in a wall plate of the lining pan (2), so that the middle chamber (400) is communicated with the thermal insulation chambers (200), andthe lower chamber(500) is communicated with the heating chamber (100). The circulation fan (32) circulates heat generated by the heating pipe assembly (4) in the heating chamber (100), and the exhaustfan (31) blows external air to the outside through the thermal insulation chambers (200).

A kind of horizontal type high-temperature hot-blast stove, it includes a furnace body (6), a ball bed (4), a cold air opening (1) and a hot air opening (9). Combustion chambers (2) are respectively set on the left side and right side in the furnace body (6). And several burner guns (3) are set on the bottom of the furnace body (6) which locates on the lower part of the combustion chambers (2). The cold air opening (1) is set on the left side of the furnace body (6), and the hot air opening (9) is set on the right side of the furnace body (6), and the cold air opening (1) and the hot air opening (9) are respectively communicated with the combustion chambers (2) which are set on the left side and right side in the furnace body (6). The ball bed (4) is set in the middle part of the furnace body (6). The configuration of the two sides of the ball bed (4) is a checker brick configuration, and a manhole (5) is set on the top of the furnace body (6).

The invention relates to a melt spinning method for a high-strength high-modulus polyvinyl alcohol fiber, comprising the following steps: uniformly mixing polyvinyl alcohol, water and an amide compound, and then, sufficiently swelling; adding the sufficiently swelled polyvinyl alcohol into a twin screw extruder, sufficiently melting, then extruding, and cooling the melt trickle through air blowing to form a nascent fiber; and drying the prepared nascent fiber through a hot-air oven, and then carrying out multistage stretching and tension heat setting to form the polyvinyl alcohol fiber. By using the preparation method of the polyvinyl alcohol fiber provided by the invention, melt spinning and high stretching of the polyvinyl alcohol are realized through hydrogen bond compounding among molecules of the water, the amide compound and the polyvinyl alcohol, and the prepared polyvinyl alcohol fiber has excellent mechanical property; and the melt spinning method is simple in production process, little in environment pollution and low in production cost; and the polyvinyl alcohol fiber prepared by using the method has the advantages of controllable fineness, high strength and high modulus so as to be widely applied to the field of civil engineering concrete.

The invention discloses a method for hybrid system modeling and coordinated optimization control of a blast-furnace hot blast stove. The method includes the steps of using subspace identification for respectively obtaining a combustion period model and an air supply period model of the blast-furnace hot blast stove so that process conditions can be effectively reflected, integrating the combustion model and the air supply model, establishing a hybrid system model based on a mixed logical dynamical method and finally realizing the coordinated optimization control of the blast-furnace hot blast stove by the use of a predictive control for the hybrid system. The method has the significant advantages of more closely reflecting the working cycle of the hot blast stove, more reasonably controlling the air supply quality of the hot blast stove and having strong adaptability. Furthermore, the method has the good effects on guaranteeing stable production and safe operation of the blast furnace, improving the smelting quality of the blast furnace, saving gas resource consumption, and the like. And thus, the method has better economic and social benefits.

The invention provides a blast furnace molten iron quality predicting system based on ensemble learning and a method. The system comprises the components of a blast furnace, a hot air furnace, a firstflowmeter, a second flowmeter, a third flowmeter, a thermometer, a pressure gauge, a humidity gauge, a furnace bosh gas metering analyzer, an oxygen enrichment measuring analyzer, a data acquisitiondevice and a computer. Preprocessing is performed on acquired real-time to-be-tested blast furnace data. Input and output parameters are acquired. A multivariate molten iron quality online predictingmodel of an established root mean square error probability weighted integrated random weight neural network is used for obtaining an online predicting result. The blast furnace molten iron quality predicting system and the method have advantages of preventing uncertainty caused by offline testing hysteresis and manual operation, realizing real-time online accurate soft measurement, supplying key indexes for in-time accurate determining of the internal operation state of the blast furnace by a field operator, updating a soft measurement model parameter by means of latest process data accordingto the working condition change, preventing restriction of a time-invariant model, and realizing high practical value.