High-temperature liquid-state slag dry type centrifugation and granulation waste heat recycling system and method

Abstract

The invention discloses a high-temperature liquid-state slag dry type centrifugation and granulation waste heat recycling system and method. The system comprises a liquid-state slag drainage system, a liquid-state slag buffering system, a liquid-state slag granulation and heat exchange system, a slag particle conveying system and a waste heat recycling system. The liquid-state slag drainage system comprises a slag groove, a baffle and a slag outlet. The liquid-state slag buffering system is composed of one or more independent slag bags. Each slag bag comprises a bag body, a bag cover, a slag discharge pipe, a stopper rod and other structures. The liquid-state slag granulation and heat exchange system is composed of one or more independent granulation and heat exchange modules which are arranged side by side in one or multiple rows. Each granulation and heat exchange module is composed of a granulation bin, a centrifugal granulator, a movable bed and a slag discharge device. The slag particle conveying system comprises a temperature-resistant conveyor belt and a buffering material bin. The waste heat recycling system comprises a primary dust collector, a waste heat boiler, a secondary dust collector, an exhaust draught fan and a chimney which are sequentially connected. By means of the system and the method, granulation and waste heat recycling of liquid-state slag are effectively achieved.

Description

technical field [0001] The invention relates to the technical field of waste heat recovery of blast furnace slag, in particular to a waste heat recovery system and method for dry centrifugal granulation of high-temperature liquid slag. Background technique [0002] China is currently the world's largest steel producer, and its steel output has remained the world's largest for 17 consecutive years. In 2014, China's pig iron output reached 711 million tons, accounting for about 60% of the world's total output. In the process of smelting pig iron, blast furnace slag containing huge heat will be produced. The temperature of blast furnace slag is generally between 1400 ~ 1550 ℃, and each ton of slag contains (1260 ~ 1880) × 10 3 The sensible heat of kJ is equivalent to 60kg standard coal. Under the current ironmaking technology in my country, 0.3 tons of blast furnace slag is produced for every ton of pig iron produced. Based on the current pig iron production in my country of ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a high-temperature liquid slag dry-type centrifugal granulation waste heat recovery system and method to solve the problem of serious waste of high-quality waste heat resources in blast furnace liquid slag

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