Efficient recycling method and device for complementary energy of blast furnace slag

A technology of residual energy recovery and recovery device, applied in the direction of improving energy efficiency, recycling technology, furnace, etc., can solve the problem of ineffective utilization of blast furnace slag residual energy, reduce power consumption and equipment investment, enhance granulation effect, Low water consumption

Active Publication Date: 2013-10-23
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a method for efficiently recovering the residual heat of blast furnace slag, which solves the problem that the residual energy of blast furnace slag cannot be effectively utilized at present

Method used

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  • Efficient recycling method and device for complementary energy of blast furnace slag

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Embodiment 1

[0021] Example 1, using the recovery device of the present invention, taking a blast furnace of a certain factory as an example, the iron production is 240t / h, the slag volume is 72t / h, and the slag temperature is 1500°C. The height of the designed furnace body is 7m, and the size of the slag collecting tank is 3m 3 Calculated by the enthalpy of blast furnace slag 1885KJ / kg, the required flow of cooling water is 60KNm 3 / h, the recovery of all energy can be guaranteed. Since the calculated slag flow rate is 8kg / min, according to the impulse of the broken slag particles, the pressure of the high-pressure air is 5Mpa and the flow rate is 15KNm. 3 / h. It can generate superheated steam with a pressure of 15Mpa and a temperature of 350℃. The diameter of the slag particles after heat exchange is 3mm, and the temperature is below 300°C.

Embodiment 2

[0022] Example 2, using the recovery device of the present invention, taking a blast furnace in a factory as an example, the iron production is 480t / h, the slag volume is 144t / h, and the slag temperature is 1500°C. The height of the designed furnace body is 10m, and the size of the slag collecting tank is 6m 3 Calculated by the enthalpy of blast furnace slag 1885KJ / kg, the required flow of cooling water is 120KNm 3 / h, you can ensure the recovery of all energy. Since the calculated slag flow rate is 16kg / min, according to the impulse of the broken slag particles, the pressure of the high-pressure air is 5Mpa and the flow rate is 30KNm. 3 / h. It can generate superheated steam with a pressure of 15Mpa and a temperature of 350℃. The diameter of the slag particles after heat exchange is 3mm, and the temperature is below 300°C.

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Abstract

The invention discloses an efficient recycling method for complementary energy of blast furnace slag, which is characterized in that latent heat and sensible heat of the blast furnace slag are taken away through latent heat of vaporization of water during crushing and granulating of the smelting blast furnace slag, so as to complete recycling of the sensible heat of the blast furnace slag, and meanwhile, the blast furnace slag is cooled quickly by utilizing the latent heat of vaporization of the water. The method comprises the following specific technological processes: the smelting blast furnace slag sequentially passes through a slag collecting groove of a recycling device and a diversion trench to flow into a stove body; the blast furnace slag is smashed by a high-pressure steam-water mixture from a steam-water nozzle and then brought up to the upper part of the furnace body. During the moving process, the water of the steam-water mixture is vaporized, and the latent heat and the sensible heat of the blast furnace slag are taken away; the cooled blast furnace slag particles are discharged out through a deslagging port under the action of gravity; the heated high pressure steam is used for grid connection or power generation after being subjected to treatment by a dust remover via a pipeline at the top of the furnace roof. The method and the device utilize centrifugal force and blasting force of expansion of water in rapid evaporation to crush the liquid blast furnace slag, as a result, the granulating effect is increased, the equipment investment and power consumption of a granulating device are reduced; and moreover, the water consumption is smaller, thereby saving water resources.

Description

Technical field [0001] The invention belongs to the field of ironmaking residual energy recovery and utilization in metallurgical process, and specifically relates to a method and a recovery device for recovering blast furnace slag with high efficiency residual energy. Background technique [0002] The current blast furnace slag processing method is mainly water quenching and cooling, and the granulated slag obtained by the water quenching slag process is mainly amorphous glass phase, which has high utilization value. However, a large amount of low-quality warm water and saturated steam are formed by the water quenching slag method, and the waste heat is difficult to recycle. Therefore, the study of new recovery methods of blast furnace slag is called a new topic in this research field. This research has been carried out at home and abroad. [0003] Japan’s NKK cooling drum method injects molten blast furnace slag into two drums through a slag trench or pipe. The drum rotates con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08F27D17/00
CPCY02P10/20Y02P10/25Y02W30/50
Inventor 刘常鹏徐春柏张宇李卫东张天赋袁玲王东山
Owner ANGANG STEEL CO LTD
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