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Blast furnace slag granulation and waste heat recovery system

A waste heat recovery system, blast furnace slag technology, applied in recycling technology, lighting and heating equipment, furnaces, etc., can solve the problems of poor granulation quality, low waste heat recovery and utilization efficiency, etc., to ensure quality, improve utilization efficiency, The effect of high heat transfer performance

Inactive Publication Date: 2021-11-19
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The existing blast furnace slag waste heat recovery technology has problems and technical defects such as poor granulation quality and low waste heat recovery and utilization efficiency. Therefore, a new technical solution is now proposed

Method used

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  • Blast furnace slag granulation and waste heat recovery system

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Embodiment Construction

[0025] In order to explain the present invention better, so that understand, below in conjunction with appendix figure 1 , the present invention is described in detail through specific embodiments, and the working principle process of the present invention is as follows:

[0026] 1. The 1400-1600°C blast furnace slag discharged from the blast furnace 1 is transported to the granulation fluidized bed furnace 31 through the liquid slag pipeline 21;

[0027] 2. There is a CO in front of the granulation fluidized bed furnace 31 2 High pressure pump 35, supercritical CO near critical state 2 The gas flow is split into two paths: pelletized supercritical CO 2 Gas flow and cooling fluidized supercritical CO 2 airflow;

[0028] 3. Blast furnace liquid slag is heated by high-speed supercritical CO with a parameter of 7.4MPa / 32°C at the entrance of the granulation fluidized bed furnace 31 2 Airflow rapid cooling and impact granulation;

[0029] 4. Cooling fluidized supercritical C...

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Abstract

The invention discloses a blast furnace slag granulation and waste heat recovery system, and relates to the field of blast furnace slag waste heat recovery. The blast furnace slag granulation and waste heat recovery system comprises a blast furnace, a high-pressure slag conveying device, a slag granulation fluidized bed device, a supercritical CO2 recompression power circulation system and a low-temperature slag heat recovery device; the high-pressure slag conveying device is arranged between the blast furnace and the slag granulation fluidized bed device; the slag granulation fluidized bed device is connected with the low-temperature slag heat recovery device; and the supercritical CO2 recompression power circulation system is respectively connected with the slag granulation fluidized bed device and the low-temperature slag heat recovery device. The supercritical CO2 recompression circulation technology is introduced, meanwhile, supercritical CO2 airflow is adopted as a cooling medium, the waste heat recovery efficiency is improved, and meanwhile high-quality slag products are produced.

Description

technical field [0001] The invention relates to the field of blast furnace slag waste heat recovery, in particular to a blast furnace slag granulation and waste heat recovery system. Background technique [0002] The energy consumption of the iron and steel industry accounts for about 10% to 15% of the total energy consumption in my country, and the sensible heat of slag is an important secondary energy source. In 2010, my country's pig iron output was about 590 million tons, and about 180 million tons of blast furnace slag was produced. The sensible heat taken away by blast furnace slag was about 2.7×108GJ, equivalent to about 9.2 million tons of standard coal. Recovering waste heat from blast furnace slag is of great significance to energy saving and emission reduction in the iron and steel industry, as well as improving energy utilization efficiency. [0003] As a potentially active cementitious material, blast furnace slag plays an increasingly important role in the bui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08F27D17/00
CPCC21B3/06C21B3/08F27D17/004C21B2400/022C21B2400/08C21B2400/05Y02W30/50Y02P10/20Y02P10/25
Inventor 段伦博吴柯卢欲晓鲍中凯黄宇
Owner SOUTHEAST UNIV
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