Split type blast furnace slag flushing water heat exchange device and method

Abstract

The invention provides a split type blast furnace slag flushing water heat exchange device and method. The split type blast furnace slag flushing water heat exchange device comprises an upper box cover, an upper box body, a lower box cover, a lower box body, heat exchange pipe bundles and communicating pipes. The upper box cover is fixed to the top of the upper box body to form an upper heat exchange box, the lower box cover is fixed to the top of the lower box body to form a lower heat exchange box, the upper heat exchange box is connected to the upper portion of the lower heat exchange box, the heat exchange pipe bundles are arranged in the upper heat exchange box and the lower heat exchange box, two ports of each heat exchange pipe bundle communicate with a water outlet main pipe and a water inlet main pipe correspondingly, the water inlet main pipe and the water outlet main pipe of each single heat exchange box are not overlapped, the water outlet main pipes and the water inlet main pipes of the different heat exchange boxes are connected through the communicating pipes to achieve parallel connection or series connection switching of the upper heat exchange box and the lower heat exchange box, or independent heat exchange between the upper heat exchange box and the lower heat exchange box is achieved by disconnecting the communicating pipes. The split type blast furnace slag flushing water heat exchange device and method solve the problems that a sewage heat exchange device is prone to corrosion, blockage and scaling, and the heat exchange efficiency is high.

Description

technical field [0001] The invention relates to the technical field of waste heat recovery, in particular to a split type blast furnace slag flushing water heat exchange device and method. Background technique [0002] In 2020, my country's pig iron output will be 880 million tons, and a large amount of blast furnace slag will be produced during the ironmaking process. The circulating water consumption for punching 1 ton of blast furnace slag is about 10 tons. Calculated based on the ratio of 350 kg of slag, the amount of slag flushing water exceeds 3 billion tons. [0003] The temperature of blast furnace slag flushing water is generally around 85°C. Its temperature is stable, the flow rate is large, and it contains a lot of heat energy. At present, the waste heat of blast furnace slag flushing water is mainly used for heating in winter, but the slag water heat exchanger is prone to scaling, corrosion, and blockage. and leakage issues. Contents of the invention [0004]...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a split type blast furnace slag flushing water heat exchange device and method to solve the problems of easy corrosion, blockage and scaling of sewage heat exchange devices in the prior art

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