Waste heat internal and external circulation comprehensive recycling method and hot air flow system of pellet production equipment

Abstract

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.

Description

technical field [0001] The invention relates to a method for comprehensively recycling waste heat from internal and external cycles of pellet production equipment and a hot air flow system thereof, and relates to the technical field of energy saving in the metallurgical industry. row production. Background technique [0002] Compared with the sintering production technology, the pellet production technology is a more reasonable, effective and energy-saving agglomeration technology. The coal consumed to produce 1 ton of pellets is about 1 / 3 of the production of 1 ton of sintered ore. The production of pellets mainly includes two processes: pelletization and oxidation, the more complicated of the two is the oxidation process, and three kinds of equipment are mainly used at home and abroad to realize the oxidation of pellets. As one of the three main equipments, the grate-rotary kiln system has the advantages of strong adaptability to raw materials, large single-machine produc...

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Problems solved by technology

[0004] The analysis of the above hot air flow system found that: the heat recovery method of the annular cooler is simple, the recovery efficiency is low, the temperature of the hot gas obtained by the waste heat recovery of the third and fourth stages of the annular cooling is not high, resulting in low heat energy utilization efficiency, and the hot gas discharged from the fourth stage of the annular cooling is directly The temperature of the grate bed of the grate machine gradually rises to over 500°C during the process of conveying the pellets, and then it is naturally cooled to about 100°C by being exposed to the air in the return section, and the heat energy has not been recovered.

Therefore, the existing air flow system of grate, rotary kiln and annular cooler is not completely reasonable, and the heat energy utilization effect is not high, and there is room for further recovery of waste heat and reduction of energy consumption

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