Method for controlling centrifugal granulation of molten blast furnace slag

Abstract

The invention relates to a method for controlling centrifugal granulation of molten blast furnace slag. The method comprises the following steps of: 1) uniformly arranging a plurality of temperature measuring devices along the direction vertical to a water cooled wall; 2) embedding a genetic algorithm program in a PLC controller, comparing a few temperature measuring points, and optimally judging and predicating a position with a minimum temperature value of the temperature measuring points; and 3) controlling a hydraulic device under a rotor by the PLC controller, and adjusting the height of a rotor to the position with the minimum temperature value. The method for controlling the centrifugal granulation of the molten blast furnace slag has the advantages of being compact and simple in structure and easy in operation, avoiding local overheating of the water cooled wall, prolonging the service life of slag centrifugal granulation devices, improving heat exchange rate and providing convenience for energy source recovery.

Description

technical field [0001] The invention relates to the field of energy recovery and utilization in the granulation process of molten slag in the steel and nonferrous metallurgy industries, and in particular to a control method for intelligent centrifugal granulation of molten blast furnace slag. Background technique [0002] Blast furnace slag is a by-product of blast furnace smelting, which consists of gangue in ore, ash in fuel and non-volatile components in flux. At present, the smelting of one ton of pig iron in my country produces about 0.3-0.6 tons of blast furnace slag. In 2008, China produced 471 million tons of iron. Even if calculated on the basis of 0.3t slag / t iron, the output of blast furnace slag is 140 million tons. At the same time, its discharge temperature is greater than 1500°C. It can be seen that the sensible heat recovery of molten blast furnace slag becomes steel An important way for enterprises to save energy and reduce consumption. Molten blast furnac...

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Problems solved by technology

[0003] Centrifugal granulation is considered to be the most effective method for slag granulation because of its characteristics of dry granulation of high-viscosity liquid, easy control of droplet size, and large monomer production capacity. There are certain problems: for example, the slag particles are splashed to a certain place of the water cooling wall, causing local overheating of the water cooling wall, affecting the service life of the water cooling wall and the heat exchange effect of the cooling medium. In addition, the distribution of slag particles is not uniform. How to solve the above The problem has become the key to the industrialization of centrifugal granulated blast furnace slag

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