41results about How to "Raise the hot air temperature" patented technology

The invention discloses a waste heat internal and external circulation comprehensive recycling method and a hot air flow system of pellet production equipment and relates to the technical field of energy conservation in the metallurgical industry. The method and the system are mainly used in a grate-rotary kiln-circular cooler pellet production process. The method and the system are characterized in that: circular cooler high-temperature pellet waste heat internal circulation high-efficiency recovery, grate high-temperature grate bed waste heat internal circulation high-efficiency recovery, inter-equipment waste heat external circulation utilization, grate preheating and drying stage heat circulation recovery and rotary kiln fire coal dust preheating improve pellet production waste heat recovery hot air temperature and heat energy, waste heat recovery efficiency, pellet production waste heat utilization rate and pellet production equipment energy-conservation and emission-reduction effect, and reduces pellet production equipment fire coal consumption.

The invention relates to a high-blast-temperature hot-blast stove burnt in a convection swirling heat storage medium, effectively solving the problems of complicated structure, non-uniform gas mixing, insufficient burning, environmental pollution and energy waste. The stove adopts the structure that a pre-burning chamber of a bell jar on the top of a ball and a taper-section barrel-shaped burningchamber below the pre-burning chamber are connected by using a labyrinth without stress action; the taper-section burning chamber is sufficiently filled with porous heat storage bodies; a coal gas inlet pipe and an air inlet pipe are distributed on the vertical wall of the pre-burning chamber; a barrel-shaped heat storage chamber is arranged below the burning chamber, and checker brick heat storage bodies are stacked on grates in the heat storage chamber; a cold air chamber is arranged below the heat storage chamber, and a smoke exhaust pipe and a cold air inlet pipe are connected to the wall; the grates for holding the heat storage bodies are mutually spaced with expansion gaps, put on a beam and supported by grate supporting posts; the supporting posts are fixed on a rigid base of the hot-blast furnace; and a central vault line of the pre-burning chamber is provided with a hot-blast outlet pipe coaxial with the hot-blast furnace. The invention has the advantages of simple structure,high mixed burning intensity, good air flow heat exchange effect and raised hot-blast temperature.

The invention discloses a method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron, belonging to the technical filed of steel making, and used for solving the problem of stably producing the ultra-low sulfur, silicon and titanium grey nodular cast iron by a blast furnace with the pig iron. The method comprises the following steps: a, blast furnace raw materialselection; b, low silicon smelting; c, stokehole silicon addition; d, stokehole desulfuration treatment; e, nitrogen spraying and stirring; and f, pig machine inoculation. The invention utilizes the treatment techniques of blast furnace raw material selection, low silicon smelting, stokehole silicon addition, stokehole desulfuration treatment, nitrogen spraying and stirring and pig machine inoculation, thus solving the technical problem of problem of stably producing ultra-low sulfur, silicon and titanium grey nodular cast iron by the blast furnace with the pig iron. The product realizes not only low Si, low Ti and super low S but also gray, and is particularly suitable for producing large-scale cast ferritic nodular cast iron and large-scale high grade nodular iron pieces such as containers for wind power generation and nuclear fuel storage, and the like, thus filling the gap of the products of the type.

The invention discloses a sinter air drafting type vertical cooling furnace. The vertical cooling furnace (A0) comprises a stock bin (1), a tower body (2) and discharging equipment (3). The tower body(2) comprises a tower top (201), a tower wall (202) and an air inlet segment (203). The tower top (201) is arranged on the top of the tower wall (202), and the air inlet segment (203) is arranged onthe lower part of the tower wall (202). The stock bin (1) is arranged on the upper part of the tower top (201) and communicates with the interior of the tower body (2). The bottom of the air inlet segment (203) is provided with a discharge port (204). The discharging equipment (3) is arranged below the discharge port (204). The tower top (201) or the upper part of the tower wall (202) is providedwith an air drafting hot air outlet (4). The vertical cooling furnace has the advantages that the sinter cooling speed is low, the cooling air capacity consumed per ton is small, the exhaust gas quantity is relatively small, the exhaust gas temperature is high, the boiler thermal efficiency is high, cooling waste gas can be completely utilized by a boiler, and the sensible heat recovery rate of sinter generally can reach about 70 %.

The invention discloses a production method for hypoeutectic cast pig iron. The production method is characterized in that the pig iron comprises the following chemical elements by mass fraction: 3.400-4.000% of C, less than or equal to 0.600% of Si, less than or equal to 0.100% of Mn, less than or equal to 0.040% of P, less than or equal to 0.030% of S and less than or equal to 0.040% of Ti. The production method comprises the following working procedures: (1), blast furnace smelting: 65-70 wt% of a high basicity sinter and 30-35 wt% of pellets are taken as raw materials, and the basicity of the high basicity sinter is 1.90-2.00; during smelting, the content of Si is controlled to be less than or equal to 0.50 wt%, and the furnace slag binary basicity R2 is controlled to be from 1.15 to 1.20; (2), electric furnace smelting: an electric furnace is heated to smelt iron by utilizing a blast furnace molten iron and waste steel method; a first inoculation treatment is performed when the iron is discharged, and the addition amount of an inoculant is controlled in a range of 2-3 kg / t molten iron; (3), casting moulding: the inoculant is added along an iron flow during casting to perform second inoculation treatment, and the addition amount of the inoculant is less than or equal to 2 kg / t molten iron. According to the production method for the hypoeutectic cast pig iron, factors, such as utilization factors, yield and hot air temperature, are improved; furthermore, the comprehensive coke ratio is remarkably reduced; the problem of thick graphite heredity in casting industry is solved.

The invention relates to a rotary-reactor hot-air heating system which comprises a recovery furnace (1), a dewater furnace (2) and a thermal decomposition furnace (3). A warm air gas furnace (4) is arranged outside the thermal decomposition furnace (3), a gas inlet pipe (5) and an air inlet pipe (6) are connectively arranged on the warm air gas furnace (4), the jacket of the warm air gas furnace (4) and the jacket of the thermal decomposition furnace (3) are connected through a hot-air outlet pipe (9), the jacket of the thermal decomposition furnace (3) and the jacket of the dewater furnace (2) are connected through a first connecting pipe (10) and a second connecting pipe (11), and the jacket of the dewater furnace (2) and the warm air gas furnace (4) are connected through a return duct (15) therebetween. The rotary-reactor hot-air heating system is high in hot-air temperature and rapid in material heating, thermal efficiency is as high as 85%, energy sources can be effectively saved, energy consumption can be reduced, and economic benefit of products can be finally improved.

The invention discloses a top-burning hot-blast stove with a cone-column composite vault structure, and belongs to the field of heat energy technology. The top-burning hot-blast stove with the cone-column composite vault structure comprises a stove body and a combustor, wherein the stove body is composed of an inlet, a hot wind outlet, supporting columns, a grate, a regenerative chamber, and a combustion chamber; column chamber walls above the combustor and cone top walls are integrated to form a mixing chamber; one side of the column chamber walls is provided with an air inlet, the column chamber walls are provided with an air circuit, and the inner side of the air circuit is provided with air nozzles; and one side of the cone top walls is provided with a gas inlet, the cone top walls are provided with a gas circuit, and the inner side of the gas circuit is provided with gas nozzles. The top-burning hot-blast stove is used for heat accumulation of wind supply to blast furnaces. Combustion is sufficient, thermal efficiency is high, and cost is low.

The invention relates to a waste heat utilization and emission reduction process for hot air systems of a chain grate machine, a rotary kiln and a circular cooler. The process is characterized by comprising the following steps of: supplying hot air in a preheating zone I to a blowing drying zone to dry the material in the blowing drying zone; supplying the waste gas in a four-cooling zone to a secondary cooling zone to cool the material in the secondary cooling zone; and supplying waste gas from a three-cooling zone to a first cooling zone to cool the material in the first cooling zone. By the process, waste heat and heat of pellet hot air systems of the chain grate machine and the rotary kiln can be fully utilized, the resistance loss of hot air is low, the operating cost of a fan can be reduced, circulating waste heat utilization of hot waste gas to be exhausted is realized, energy is saved, and emission is reduced.

The invention provides an internally-arranged cremator heat exchanger. The internally-arranged cremator heat exchanger comprises an air inflow pipe, heat exchange units, inner spray pipes and hot air spray pipes. The internally-arranged cremator heat exchanger is technically characterized in that the air inflow pipe is connected with a preheating pipe, the preheating pipe is arranged on the upper side of a vault of a hearth, the heat exchange units communicated with the preheating pipe through the inner spray pipes are arranged in the portions, on the two sides of the hearth, of a furnace body, the heat exchange units are hollow refractory prefabricated parts, the hot air spray pipes communicated with the hearth are arranged on the upper portions of the heat exchange units, and air outlets of the hot air spray pipes correspond to the middle of a bogie. The heat exchange units are the hollow refractory prefabricated parts, are directly laid inside the furnace body, and make direct contact with flames in the furnace body, and therefore the heat exchange temperature is high. Compared with a metal heat exchanger, the internally-arranged cremator heat exchanger is long in service life and free of oxidation corrosion, the expansion coefficient is consistent with that of the furnace body, and no damage is caused to the furnace body. Preheated air is further heated through the heat exchange units, the hot air temperature is higher, the incineration effect in the hearth is further improved, and fuel is effectively saved.