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A heat treatment system (100) for solid bulk material in pieces having a tower configuration and mainly comprising: - a plurality of belt conveyors (11-15) for the dry transportation of the bulk material, which belt conveyors have a stacked arrangement one above the other and thermally in series, each of said belt conveyors being configured to transport the bulk material transversely to the stacking direction; - one or more heater devices (31-35) arranged at each belt conveyor of said series to heat, e.g. by radiation, the bulk material transported thereupon; - a plurality of material discharging conduits (21-25), each interposed between an upstream belt conveyor and a downstream belt conveyor adjacent thereto in said series arrangement.

Problem: Suppress damage to refractory material on inner wall of converter type vessel while using cold iron source with large unit weight. Solution: Define first cold iron source as cold iron source with unit weight per piece less than or equal to 0.1 t/piece, second cold iron source as cold iron source with unit weight greater than 0.1 t/piece and less than or equal to 1.0 t/piece, third cold iron source as cold iron source with unit weight greater than 1.0 t/piece, let unit weight of first cold iron source be W1 t/piece, unit weight of second cold iron source be W2 t/piece, unit weight of third cold iron source be W3 t/piece, total amount of first cold iron source charged into converter type vessel be ΣW1, total amount of second cold iron source charged into converter type vessel be ΣW2, total amount of third cold iron source charged into converter type vessel be ΣW3, then charge cold iron sources so that following formula is satisfied: 0.9ΣW1/ΣW2 + 0.3ΣW1/ΣW3 > 1 Selected drawing: Figure 1

A method and apparatus for processing phosphorus-containing hydrogen-reduced DRI in an induction furnace are disclosed. The method includes the step of processing molten DRI by transferring at least partially the phosphorus in the DRI into the slag, thereby obtaining an iron raw material having a lower phosphorus concentration (usually 0.03% by weight or less) that is at least substantially alpha iron and suitable for use as a direct feed material for producing steel in steelmaking equipment such as existing EAFs. [Selected Figure] Figure 1

[Problem] To provide a blast furnace operation method that enables stable operation with a low reducing agent ratio. [Solution] A blast furnace operation method in which a hydrogen-based reducing gas and an auxiliary reducing agent are injected into the blast furnace, wherein the tuyere combustion temperature is adjusted based on the change in the amount of solution loss carbon caused by fluctuations in the amount of hydrogen-based reducing gas injected. [Selected Figure] Figure 1

To provide a method for blowing molten iron and a method for producing molten steel by which the optimum amount of lime to be charged can be determined in the static control of blowing treatment in a converter type refining furnace.SOLUTION: In a blowing method for producing molten steel by blowing molten iron, a P distribution ratio is calculated from P distribution formula using estimated FeO concentration, CaO concentration and MgO concentration in slag 3 and a set end point molten steel temperature when determining the amount of lime added at the beginning of blowing, and the lime charging amount is determined on the basis of the P distribution ratio, the P concentration in the molten iron and the target end point molten steel P concentration.SELECTED DRAWING: Figure 1

Disclosed in the present invention is an ultra-clean primary converter gas dry dedusting system, comprising a high-efficiency heat exchanger, a swirl heat recovery device, an electrostatic dust collector, a high-temperature-resistant explosion-proof ultra-clean dust collector, a cooling and displacement fan, a clean gas pipe, a gas axial fan, and a gas scrubber and dehydrator, wherein converter gas sequentially passes through the high-efficiency heat exchanger and the swirl heat recovery device and then enters the electrostatic dust collector and/or the high-temperature-resistant explosion-proof ultra-clean dust collector to form clean gas, with the outlet concentration of the ultra-clean dust collector being stably maintained below 5 mg/Nm3, and then the clean gas is scrubbed and cooled by means of the gas axial fan and the gas cooler and dehydrator and is then sent to a gas switching station. Compliant gas is sent to a gas holder; and non-compliant gas is sent to a flare stack for ignition and flaring.

To provide a method for operating a blast furnace capable of realizing stable operation by excellently maintaining the permeability in the furnace and the average temperature of blast furnace raw materials when using reduced iron as the blast furnace raw materials.SOLUTION: In the blast furnace operation in which the raw materials of the blast furnace are charged so that a coke layer and an ore layer containing reduced iron and iron ore are alternately stacked in the furnace of the blast furnace, and pulverized coal is blown by air blast from a tuyere, the amount of moisture in the air blast is adjusted so as to satisfy the formula (1) based on the amount of the pulverized coal blown from the tuyere and the amount of the reduced iron charged into the blast furnace. H ≤ D-A * PCR-B * M R * (1 - x) - C * M R * x (1) Here, H represents the amount (g / Nm3) of the moisture, PCR represents the amount (kg / t) of the pulverized coal blown from the tuyere, M R represents the amount (mass%) of the reduced iron in the raw materials for blast furnace, and x represents the amount (mass%) of particles having a particle size of more than 40 mm in the reduced iron. A, B, C, and D represent coefficients, and a relationship of C>B is satisfied.SELECTED DRAWING: Figure 6

A shaft furnace utilized for producing the direct reduction of iron includes an iron oxide intake located at the top of the shaft furnace for receiving an iron oxide, a reduction gas port for injecting a reduction gas into the shaft furnace, a top gas offtake located above the reduction gas port for removing a top gas resulting from reduction of the iron oxide, a cooling gas offtake located above the reduction gas port and below the top gas offtake, and a cooling a gas intake positioned above the reduction gas port and below the cooling gas offtake. The cooling gas offtake is configured to remove a portion of the reduction gas from the shaft furnace. The cooling gas intake is configured to inject a cooling gas resulting from processing the portion of the reduction gas into the shaft furnace.

本发明公开了一种面向轴承内圈弧面滚道的分级激光冲击强化方法，包括：计算第一激光峰值功率密度和第二激光峰值功率密度；在轴承滚道表面施加约束层，并使激光束的光轴沿当前加工位置的表面法线方向入射；在预冲击阶段，沿预定加工轨迹以第一激光峰值功率密度对当前加工位置实施预冲击，形成连续预硬化层；在同一当前加工位置，继续以第二激光峰值功率密度实施主冲击，形成残余压应力场；完成后，移动至下一加工位置，直至完成轴承滚道待强化区域的覆盖。本发明通过计算不同级别的激光峰值功率密度，在同一加工位置依次实施低能量预冲击和高能量主冲击，在表层形成连续预硬化层并在次表层构建深层残余压应力场，有效提升轴承的接触疲劳寿命。