A waste heat recovery system and method for dry centrifugal granulation of high-temperature liquid slag

Abstract

A system and a method for the dry centrifugal granulation of high temperature liquid slag and exhaust heat recovery. The system comprises a liquid slag drainage system, a liquid slag buffering system, a liquid slag granulation and heat exchange system, a slag particle conveying system and an exhaust heat recovery system; the liquid slag drainage system comprises a slag groove (1), a baffle and a slag outlet (2); the liquid slag buffering system is composed of one or more independent slag containers, the slag container comprising structures such as a bag body (3), a bag cover (4), a slag pipe (5), and a stopper rod (6); the liquid slag granulation and heat exchange system is composed of one or more independent granulation and heat exchange systems which are arranged side by side in one or multiple rows, each granulation and heat exchange system being composed of a granulation bin (7), a centrifugal granulator (8), a movable bed (9) and a slag discharge device; the slag particle conveying system comprises a temperature-resistant conveyor belt (14) and a buffering material bin; the exhaust heat recovery system comprises a primary dust collector (15), an exhaust heat boiler (16), a secondary dust collector (17), an exhaust draught fan (18) and a chimney (19) which are connected in sequence.

Description

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

AI Technical Summary

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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