Recovery method of steel slag residual heat and system thereof

A waste heat recovery system and waste heat recovery technology are applied in the field of iron and steel metallurgy energy saving and secondary energy recovery, which can solve the problems of physical heat and phase change heat without industrialized recovery methods, and achieve saving and corresponding power consumption, elimination of environmental pollution, The effect of saving drying energy

Active Publication Date: 2009-10-07
HANGZHOU BOILER GRP CO LTD
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Problems solved by technology

Worldwide, there is no industrial recovery method for the physical hea

Method used

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  • Recovery method of steel slag residual heat and system thereof

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Embodiment Construction

[0022] Such as figure 1 As shown, the steel slag waste heat recovery system consists of steel slag flow distributor 1, water-cooled granulation wheel 2, primary fluidized bed 3, primary cooling fan 4, weighing machine 5, vibrating screen 6, hot slag storage bin 7, secondary cooling Fan 8, secondary fluidized bed 9, exhaust fan 10, chimney 11, dust collector 12, waste heat boiler 13, cyclone dust collector 14. In order to realize the uniform flow of steel slag entering the waste heat recovery system, first pour high-temperature liquid steel slag into the steel slag flow distributor 1, which is made of refractory material and has a slag outlet; in order to ensure reliable operation at high temperatures And it has a long service life. The granulation wheel 2 used for steel slag crushing is cooled by water in the axial direction; in order to achieve the purpose of continuous heat production, a two-stage fluidized bed is used for gas-slag heat exchange. A weighing machine 5, a vib...

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Abstract

The invention discloses a recovery method of steel slag residual heat and system thereof. The system is composed of a steel slag flow distributor, a water-cooling granulation wheel, a first fluidized bed, a weigher, a vibration sieve, a hot slag particles bunker, a second fluidized bed, a dedusting device, a blower and a residual heat boiler in sequence. The method is that, pouring high-temperature liquid slag into the steel slag flow distributor, the steel slag flown out of the steel slag flow distributor falling onto the water-cooling granulation wheel and being crushed and throwing out to fall into the first fluidized bed for exchanging heat with air, hot slag particles discharged from the first fluidized bed is stored in the hot slag particles bunker after going through the weigher and the vibration sieve, and discharging when the temperature is cooled to 350 DEG by a heat exchanger of the second fluidized bed. High-temperature air discharged from the first fluidized bed and the second fluidized bed enters the residual heat boiler for exchanging heat after dedusting. The invention can reduce energy consumption in steel production, graining effect of the steel slag is good, which is benefit for following degradation of free CaO and magnetic separation of wasted steel.

Description

technical field [0001] The invention relates to a waste heat recycling technology, in particular to iron and steel metallurgy energy saving and secondary energy recovery. Background technique [0002] Steel is the structural material with the largest consumption and the functional material with the highest output. The iron and steel industry is one of the pillar industries of my country's national economy. With the rapid growth of steel production, resources, energy and environmental pollution have become the limiting factors restricting the sustainable development of my country's steel industry. In the process of iron and steel metallurgy, a large amount of high-temperature steel slag is produced, which contains a large amount of heat. Its recycling is of great significance for iron and steel enterprises to save energy, water consumption and reduce pollutant emissions. [0003] The annual output of crude steel in my country has exceeded 500 million tons, and 80-150 kg of ...

Claims

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Application Information

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IPC IPC(8): F27D17/00C22B1/14C22B1/10
CPCY02P10/20
Inventor 周勇赵剑云陈伟
Owner HANGZHOU BOILER GRP CO LTD
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