Device and method for granulating blast furnace slag and recycling waste heat

A waste heat recovery and blast furnace slag technology, which is applied in recycling technology, steam engine devices, lighting and heating equipment, etc., can solve problems such as high equipment cost and energy consumption, secondary pollution of air and water sources, and low treatment efficiency

Pending Publication Date: 2021-08-31
SHANGHAI MEISHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of technology, the sludge treatment of the existing technology can adopt fermentation, melting, lime addition, carbonization and other treatment method

Method used

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  • Device and method for granulating blast furnace slag and recycling waste heat
  • Device and method for granulating blast furnace slag and recycling waste heat
  • Device and method for granulating blast furnace slag and recycling waste heat

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0067] The preparation steps of described high temperature steam are:

[0068] Step 4.2.1: The cyclone separator 8 transports the high temperature granular slag 6 to the high temperature granular slag conveyor 21 . After being fed into the high temperature slag heat exchanger 22, the high temperature granulated slag 6 moves from top to bottom, and in the process of descending, it is in countercurrent contact with the cooling water in the coil and the air from bottom to top to exchange heat.

[0069] Step 4.2.2: The heated high temperature steam is discharged from the top of the high temperature granular slag heat exchanger 22 and sent to the boiler 23, and the cooled granular slag is discharged into the slag bin 11 from the lower part of the high temperature granular slag heat exchanger. The temperature of the slag after cooling is below 200°C.

[0070] Step 4.2.3: The external pipe network sends the pure water to the economizer 24, and is preheated to above 80°C by the mediu...

Embodiment 1

[0078] Please see attached figure 1 , When the blast furnace is tapping, the blast furnace slag enters the main ditch along with the molten iron from the tap hole, and is divided by the slag stopper. The molten slag at 1450-1550 ℃ is separated from the molten iron and enters the slag slag ditch, and then enters the aerosol granulation nozzle. The components are granulated: the slag flow 1 flows out after being controlled by the slag flow controller 2. After the slag flow 1 is separated from the slag flow controller 2, the high-pressure aerosol sprayed by the aerosol spray gun 5 is sprayed during the falling process. Blown, granulated and preliminarily cooled to form high temperature granular slag 6 at 1000-1200 °C and medium temperature gas at 200-400 °C. The flow rate of the high-pressure aerosol is determined by the compressed air flow control valve 3 and the water quantity control valve 4, and is automatically adjusted within a certain range with the size of the slag flow 1...

Embodiment 2

[0083] Please see attached figure 2 , When the blast furnace is tapping, the blast furnace slag enters the main ditch along with the molten iron from the tap hole, and is divided by the slag stopper. The molten slag at 1450-1550 ℃ is separated from the molten iron and enters the slag slag ditch, and then enters the aerosol granulation nozzle. The components are granulated: the slag flow 1 flows out after being controlled by the slag flow controller 2. After the slag flow 1 is separated from the slag flow controller 2, the high-pressure aerosol sprayed by the aerosol spray gun 5 is sprayed during the falling process. Blown, granulated and preliminarily cooled to form high temperature granular slag 6 at 1000-1200 °C and medium and high temperature gas at 200-400 °C. The flow rate of the high-pressure aerosol is determined by the compressed air flow control valve 3 and the water quantity control valve 4, and is automatically adjusted within a certain range with the size of the s...

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PUM

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Abstract

The invention discloses a device and method for granulating blast furnace slag and recycling waste heat. The device comprises an aerial fog granulation nozzle assembly, a fluid director (7), a cyclone separator (8) and a waste heat recoverer. The aerial fog granulation nozzle assembly comprises a slag flow controller (2), a compressed air flow control valve (3), a water quantity control valve (4) and an aerial fog spray gun (5). Mixing heat exchange of medium-temperature gas and high-temperature granular slag (6) and solidification of the high-temperature granular slag are realized in the fluid director, and the medium-high-temperature gas and the high-temperature granular slag after heat exchange are guided into the cyclone separator. The cyclone separator is used for separating medium-high-temperature gas and high-temperature granular slag and conveying the medium-high-temperature gas and the high-temperature granular slag into the waste heat recoverer. Complete granulation of the blast furnace slag is achieved, slag sensible heat recovery is organically coupled with sludge drying, high-temperature steam preparation, power generation and low-temperature hot water preparation, waste heat recovery of medium-temperature gas and high-temperature granulated slag in the slag granulation treatment process is achieved, and the waste heat recovery and utilization efficiency is improved.

Description

technical field [0001] The invention relates to a metallurgical slag processing equipment and method, in particular to a blast furnace slag granulation and waste heat recovery and utilization device and method. Background technique [0002] Blast furnace slag is the main by-product of blast furnace ironmaking, and the amount of blast furnace slag produced per ton of iron is about 350 kg. The discharge temperature of blast furnace slag is 1450℃~1550℃, and the sensible heat carried by tons of slag ((1260-1880)×10 3 kJ) is equivalent to the calorific value of 60kg of standard coal, which has high recovery value. [0003] At present, the treatment of blast furnace slag mostly adopts the water quenching process. The slag is washed into water slag by high-pressure water, and the high-grade sensible heat is transferred to the water slag and wastewater at about 80 °C, which loses the value of recycling. In addition, each ton of molten slag needs to consume 0.4 to 0.5 tons of water...

Claims

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Application Information

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IPC IPC(8): C21B3/06C21B3/08
CPCC21B3/06C21B3/08C21B2400/024C21B2400/08C21B2400/062F01K25/14Y02W30/50Y02P10/20Y02P10/25C21B2400/032C21B7/002F01K27/00F27D17/00C03C13/06F27D17/004
Inventor 肖永力李永谦张友平关运泽谢梦芹王英杰
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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