Physical heat recovery process of high-temperature material

Abstract

The invention aims at recovering physical heat of liquid-state molten slag, and can be used for recovering waste heat of steel slag or blast furnace slag in a metallurgical process. A tunnel type boiler is established by using intermittent operation characteristic of the metallurgical process to convert physical sensible heat of the molten slag into a high-grade energy heat source for power generation or other technological processes. The process comprises the following steps of: firstly laying the molten liquid-state slag produced by a production process flakily, and setting a radiant heating surface to recover high-temperature heat by using high temperature characteristic of the slag so as to form a first heat absorbing stage; introducing flowing air by using an induced draught fan after the temperature of the surface is reduced to a certain value, and absorbing gas convective heat and a part of radiant heat by using a high-efficiency heat transfer element (such as a heat pipe) to form a second heat absorbing stage; and feeding the substantially solidified (at least surface solidified) slag into a water quenching chamber which can bear a certain pressure, gradually ejecting cold water to the slag body to blow up the cracked slag body into powder, performing subsequent cooling on the metallurgical slag, namely externally connecting a barrel type slag cooler to continuously recover the physical heat so as to form a third heat absorbing stage.

Description

Technical field: [0001] The invention relates to the field of physical heat recovery of molten high-temperature materials. Taking the metallurgical process as an example, the temperature of steel slag or blast furnace slag is at least 1400°C, with a lot of physical heat. Utilizing the intermittent operation characteristics of the metallurgical process, a tunnel boiler is established to convert the physical sensible heat of molten slag into higher-grade energy for power generation or heat source for other processes. Background technique: [0002] When China's total steel output reached about 500 million tons (2007-2008), the annual output of metallurgical slag reached more than 100 million tons. It is estimated that China's crude steel output will reach 575 million tons in 2009, nearly half of the global crude steel output. If the steel slag is cooled from 1500 °C to 300 °C, the heat contained in 150 million tons of steel slag is equivalent to 5248.53 tons of standard coal,...

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Problems solved by technology

Using metallurgical slag as the keyword search on CNKI (CNKI Chinese Journal Full-text Database), 183 documents appeared, most of which studied the utilization of metallurgical slag from the perspective of circular economy and comprehensive utilization of resources, and less than 10 documents related to the physical heat recovery and utilization of metallurgical slag articles

3. Due to energy and economic reasons, the physical sensible heat of steel slag has attracted people's attention again, but there is still a lack of a feasible technical measure

This temperature gradient, on the one hand, may cause cracks on the surface of the molten slag to solidify, on the other hand, the heat conduction inside the steel slag will increase the surface temperature of the slag

However, the improvement of the surface temperature by relying on internal heat conduction is limited.

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