Two-stage phase change recovery and storage device for metallurgical flue gas waste heat

Abstract

The invention relates to a two-stage phase change recovery and storage device for metallurgical flue gas waste heat. A phase change energy storage material is used for recovering and storing waste heat in flue gas generated in the metallurgical process. The device comprises a flue gas introduction device, a heat preservation flue gas channel, a first-stage medium-temperature heat energy phase change recovery and storage unit, a second-stage low-temperature heat energy phase change recovery and storage unit, a smoke exhaust tower and a control system. The two-stage phase change recovery and storage device for the metallurgical flue gas waste heat has the beneficial effects that the phase change energy storage material is fully utilized for graded recovery of preheating of metallurgical fluegas to implement stable and continuous heat recovery; due to the arrangement of a fixed tower type phase change energy storage unit and a container type phase change energy storage unit, fixed energycan be used nearby; and the recovered energy can be transferred and used flexibly, so that maximum recycling of heat in the flue gas is guaranteed, the energy waste is controlled to be minimum, and the energy utilization efficiency is improved.

Description

technical field [0001] The invention relates to the field of energy recovery and reuse in the metallurgical industry, in particular to a dual-stage phase change recovery and storage device for metallurgical flue gas waste heat. Background technique [0002] With the needs of industrial development and the deepening of the concept of energy saving, environmental protection, low consumption and high efficiency, more and more metallurgical enterprises have begun to pay attention to the recycling and efficient utilization of resources, so the recycling of secondary energy in the metallurgical process has become the focus of enterprises focus. As the main process product in the metallurgical process, flue gas contains abundant waste heat resources and has great recyclability. [0003] Although many enterprises have started to use flue gas recovery and utilization devices and introduced corresponding technological processes, there is still a large gap with the international advan...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a two-stage phase change recovery and storage device for waste heat of metallurgical flue gas, so as to solve the problem of low energy utilization rate of heat recovery of metallurgical flue gas in the prior art, and waste heat resources of medium and low quality are difficult to use and waste , the collected heat cannot be stored for backup, etc.

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