A blast furnace slag granulation and sensible heat recovery process and equipment

Abstract

The invention provides a process and equipment for the slag granulation and sensible heat recovery of a blast furnace. The equipment is mainly formed through the parallel connection of a slag granulation device, a sensible heat recovery device, gate valves, a generator set, a chain type conveying mechanism and two horizontal rollers. The granulation device is mounted above the right side of the roller of the sensible heat recovery device, a slag inlet of the granulation device is located below a slag outlet chute of the blast furnace, the chain type conveying mechanism is mounted below the left side of the sensible heat recovery device, and a heat power conveying pipeline and the generator set are mounted at the two sides of an axis center of the horizontal rollers. When a first roller starts to be subjected to slag inlet, slag storage and heat exchange, a second roller starts to discharge slag, and at the moment, water enters the slag discharging roller through the gate valves, is preheated by the waste heat, then enters the first roller and is changed into saturated steam through heat exchange. Contrarily, the heat exchange work of the two rollers is replaced, so that the continuity of heat energy supply is guaranteed. The process and the equipment have the advantages of continuity in sensible heat recovery, high efficiency, short cycle, high glass phase degree, compact, safe and reliable structure and low water consumption.

Description

Technical field: [0001] The invention belongs to the technical field of high-temperature liquid slag granulation and waste heat recovery of ironmaking blast furnaces, and in particular relates to a blast furnace slag granulation and sensible heat recovery process and equipment for high-temperature liquid slag granulation and heat energy recovery. Background technique: [0002] In the prior art, the iron and steel industry is a typical process industry, resource- and energy-intensive, with large throughput and long manufacturing chain. In 2012, China's pig iron production reached 500 million tons respectively. With the rapid growth of steel production, resources, energy and pollutant emissions have become factors restricting the further development of my country's steel industry. Therefore, reducing energy consumption through energy conservation and energy recovery is an important goal of the steel industry. At present, every ton of pig iron produced by the blast furnace pro...

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Problems solved by technology

The disadvantage of this method is that the sensible heat of blast furnace slag is basically not recovered, and it causes a lot of waste of water resources. Due to the open-air production during water quenching of high-temperature slag, a large amount of harmful steam cannot be recovered, which also causes serious pollution to the atmosphere, water and soil.

Problems existing in the current rotary cup granulation method ①Because the rotational speed of the rotating cup body of the rotary cup granulation method is too high at 1000-3000r / min, the working life of the industrial bearing is difficult to reach the service life under high temperature, high speed and harsh environment Require

② Due to the direct contact of the rotating cup with high-temperature slag, the structure of the rotating cup and the limitation of the slag granulation process, the cooling of the rotating cup body is difficult to solve, and the working life of the rotating cup is difficult to meet the requirements of use

③ Iron tapping and slag removal during blast furnace smelting are intermittent, and sensible heat recovery cannot guarantee its continuity. Therefore, for industries that require continuous heat supply, the recovery and utilization of sensible heat from blast furnace slag granulation has not yet achieved industrial continuity. request for sexual exploitation

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