Continuous-casting two-cooling-section waste heat power generation method and equipment based on organic working medium Rankine cycle

Abstract

The invention discloses a continuous-casting two-cooling-section waste heat power generation method and equipment based on an organic working medium Rankine cycle. The equipment comprises a waste heat recovery system, a heat exchanger (6) and an organic working medium Rankine cycle power generation system connected with the heat exchanger (6). The waste heat recovery system comprises a medium-temperature salt bathing pool (3) and a medium-temperature salt melting furnace (5) connected with the medium-temperature salt bathing pool (3), wherein a roller shaft (2) is arranged inside the medium-temperature salt bathing pool (3); and the medium-temperature salt bathing pool (3) is connected with the heat exchanger (6). According to the waste heat recovery system, molten salt is adopted as a heat exchanging medium. With the adoption of the system, the continuous-casting two-cooling-section waste heat power generation method and the equipment based on the organic working medium Rankine cycle have the advantages of high waste heat recovery ratio and remarkable economic and social benefits.

Description

technical field [0001] The invention relates to the field of devices utilizing waste heat, in particular to a method and equipment for generating power in an organic working fluid Rankine cycle by using waste heat in a secondary cooling section of continuous casting. Background technique [0002] In the second cooling section of continuous casting, the liquid molten steel is initially cooled to form a hard shell on the outside, the temperature drops to about 1300°C, and then it is further cooled by spraying water until the slab is completely solidified, and the temperature at this time is about 900°C. During the process of the temperature from 1300°C to 900°C, the cooling of the billet releases a large amount of heat, an average of about 180kJ / kg steel, calculated according to the time of the slab casting speed (220mm thick × 1500mm wide, casting speed 1.0m / min For example), the thermal power reaches 7890KW. If such a huge amount of heat is used to produce steam or generate...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to improve the design of the existing waste heat recovery power generation system in order to overcome the shortcomings of the existing waste heat recovery power generation system such as low waste heat utilization rate and poor heat exchange effect, and obtain a kind of Waste heat power generation method and equipment in the secondary cooling section of continuous casting based on organic working fluid Rankine cycle for electric energy, high recovery rate of waste heat, and significant economic and social benefits

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