Method for raising air temperature of hot blast stove by recovering sensible heat of blast furnace slag

A technology of blast furnace slag and hot blast stove, applied in the direction of recycling technology, blast furnace, blast furnace details, etc., can solve the problem of only reaching the level of about 1130 ℃ ~ 1150 ℃, shorten the return on investment period, increase value, and reduce equipment The effect of investment

Inactive Publication Date: 2010-10-20
北京睿德趋势量化咨询有限公司
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Problems solved by technology

However, in ironworks where only low calorific value blast furnace gas can be used as hot blast stove gas, even under the condition of preheating blast furnace gas and combustion-supporting air to 200°C with waste heat from hot blast stove flue gas, the annual average air temperature is only It can reach the level of about 1130℃~1150℃

Method used

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  • Method for raising air temperature of hot blast stove by recovering sensible heat of blast furnace slag
  • Method for raising air temperature of hot blast stove by recovering sensible heat of blast furnace slag

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Embodiment Construction

[0023] Those skilled in the art can better understand the further disclosure, purpose, advantages and aspects of the present application with reference to the preferred embodiments of the present invention in conjunction with the accompanying drawings, and these provided drawings and embodiments are only for the purpose of illustration , rather than limiting the scope of protection of the invention.

[0024] Exemplary embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The same reference numerals in the figures denote the same parts.

[0025] Such as figure 1 As shown, the equipment of the present invention includes: a treatment furnace 1, a buffer slag tank 2 for one standby and one for use, a slag tank 3, a granulation cooling nozzle 4, a first air blower 5, a multi-stage fluidized bed device 6, a second air blower 7, Accident maintenance slag discharge pipe 8, furnace body 9, rotary sealing valve 10, high t...

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Abstract

The invention discloses a method for raising the air temperature of a hot blast stove by recovering the sensible heat of blast furnace slag. In the invention, the high-temperature air resulting from a drying process is subjected to a secondary dust removal and a pressurization processing and then used as high-temperature combustion-supporting air for the hot blast stove to raise the temperature of the hot air of the hot blast stove to 1250-1270 DEG C, which is 100-120 DEG C higher than that of the hot air of the hot blast stove using blast furnace gas only. As the economic benefit brought by the raising of air temperature to blast furnace iron making is far higher than that brought by the production of steam by a waste heat boiler, and the step of converting high-temperature air to steam and the corresponding investment in waste heat boiler are saved, the method greatly improves the recovery value of the sensible heat of blast furnace slag and shortens investment recovery periods of corresponding projects.

Description

technical field [0001] The invention relates to the field of energy conversion and utilization in iron and steel plants, in particular to a method for recovering and utilizing the sensible heat of blast furnace slag to increase the air temperature of a hot blast stove. Background technique [0002] Blast furnace slag is a by-product of the ironmaking process. Usually, 300kg of slag with a temperature of 1450°C to 1550°C will be produced for every ton of molten iron produced. The sensible heat contained in a ton of 1500°C slag is equivalent to about 60kg of standard coal. Due to the lack of continuous, efficient and reliable dry treatment technology, a large amount of slag produced in the existing blast furnace smelting process is usually treated by water quenching process. Each ton of slag needs to consume about 1 ton of water, and most of the sensible heat in the slag As the water evaporates, it is lost, so the sensible heat of the blast furnace slag is basically not recove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B9/00C21B3/06
CPCY02P10/20Y02W30/50
Inventor 林佐华魏恩发
Owner 北京睿德趋势量化咨询有限公司
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