Liquid slag waste heat recovery device and method for recovering slag waste heat by utilizing same

Abstract

The invention discloses a liquid slag waste heat recovery device and a method for recovering slag waste heat by utilizing the same. The liquid slag waste heat recovery device comprises an overheat steam generator, an evaporator, a crusher, a heat preservation slag transport device and a slag conveying device, wherein the crusher is arranged above the evaporator and communicated with the evaporator which is communicated with the overheat steam generator to form steam cycle, a steam pressurizing device and a heat exchanger are arranged on the upstream of the overheat steam generator, another heat exchanger is arranged on the downstream of the overheat steam generator, and liquid slag is arranged in the overheat steam generator. Steam enters the overheat steam generator from top to bottom to perform heat exchange, the heat preservation slag transport device transports solid slag to the crusher, a water spraying device is arranged at the top of the evaporator, and the slag conveying device is arranged below the evaporator. The liquid slag waste heat recovery device can effectively recover heat of blast-furnace slag. The obtained steam can be directly used by a steam turbine to generate power, so that energy is effectively saved, and power generation is free of fuel and pollution.

Description

technical field [0001] The invention relates to a follow-up treatment device for high-temperature slag in the blast furnace smelting process, in particular to a liquid slag waste heat recovery device. [0002] The present invention also relates to a method for recovering slag waste heat from liquid high-temperature slag by using the liquid slag waste heat recovery device. Background technique [0003] Waste heat resources in iron and steel enterprises are mainly concentrated in coking, sintering, ironmaking, steelmaking and hot rolling processes, which are manifested as product waste heat, flue gas waste heat, waste slag sensible heat and cooling water sensible heat. In order to reduce iron oxide to metallic iron, theoretically only about 150-250 kg standard coal / ton iron (kgce / t Fe )energy. At present, some modern steel plants actually consume about 700kgce / t of coal Fe about. 500kgce / t more cost Fe Energy consumption is mainly due to two reasons: one is thermodynamic ...

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Problems solved by technology

Domestic waste heat recovery and utilization of blast furnace slag is limited to heating with waste heat from slag flushing water, the recovery rate of waste heat is low, and is limited by time and region

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