Equipment for steel slag air quenching and waste heat recycling

Abstract

Equipment for steel slag air quenching and waste heat recycling belongs to the technical field of the steel slag processing equipment and method. Steel slag air quenching and waste heat recycling processes are utilized to treat high-temperature steel slags and recovering heat; and the technical scheme is as follows: in the equipment, an air quenching slag pot is connected with a pelletization air tunnel which is connected with a grate cooling conveyor; the grate cooling conveyor is connected with a high-temperature-resistant bucket elevator; the high-temperature-resistant bucket elevator is connected with a circulating fluidized bed heat recovery boiler; an external nitrogen pipeline is connected with the pelletization air tunnel and the grate cooling conveyor, respectively; and a nitrogen circulating pipeline is connected with the high-temperature-resistant bucket elevator and the circulating fluidized bed heat recovery boiler, respectively. The process flow comprises hardening and cracking liquid-state steel slags into even particles by using low-temperature nitrogen, and then feeding the steel slag particles to the circulating fluidized bed heat recovery boiler through pneumatic transmission so as to collect waste heat and zero-valent iron. The integrated steel slag air quenching process provided by the invention is in a world leading level and is innovation of liquid-state steel slag treatment and heat recovery, thereby having wide prospect.

Description

technical field [0001] The invention relates to equipment and a method for processing high-temperature steel slag in converter steelmaking and recovering heat, and belongs to the technical field of converter steel slag treatment equipment and methods. Background technique [0002] The treatment of high-temperature steel slag in converter steelmaking is a necessary link in the production of converter steelmaking. The cold disposal method and hot pouring method used in the past are due to large investment, large area occupation, serious environmental pollution, and many process equipment and production operators. Disadvantages have now been eliminated. The plate-splashing water-cooling method has cumbersome process, many links, high operating costs and waste of water, which is an outdated process. At present, the water quenching method and the wind quenching method are more widely used. The disadvantage of the water quenching method is that the sensible heat of steel sla...

AI Technical Summary

Problems solved by technology

[0004] (1) The problem of the loss of elemental iron in steel slag

After the steel slag is tapped, the steel slag contains some elemental iron elements. Due to its high temperature, which can reach 1400°C, it will inevitably be oxidized and become Fe in the process of direct contact with air or water. 2 o 3 Or FeO, causing a serious waste of resources

[0005] (2) Dust or steam

In the usual slag, magnetic separation or water quenching process, a large amount of smoke or water vapor will inevitably be generated, causing environmental pollution

[0006] (3) Collection of high temperature slag particles

[0007] (4) Nitrogen consumption

[0008] (5) Pressure release problem in the equipment

[0010] (7) Uneven feeding

If a slag cooler is used, only about 80°C hot water can be obtained, and the quantity is astonishing, requiring huge cooling water equipment

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