Stopper rod for controlling liquid-state molten slag flow

Abstract

The invention discloses a stopper rod for controlling a liquid-state molten slag flow. The stopper rod comprises a metal inner pipe, a metal outer pipe and a heat insulation layer; the metal inner pipe is sleeved with the metal outer pipe, and the metal inner pipe and the metal outer pipe are arranged in a spaced manner; the heat insulation layer is fixed to the outer wall of the metal outer pipe, a lower end opening of the metal inner pipe is communicated with the metal outer pipe, the lower end of the metal outer pipe is sealed, and a hot air outlet is formed in the upper end of the metal outer pipe; a cold air inlet is formed in the upper portion of the metal inner pipe; and according to the stopper rod, the metal inner pipe is sleeved with the metal outer pipe, and is connected with the metal outer pipe through connecting ribs, and hollow arrangement is formed. Cold air enters a center pipe from the cold air inlet, flows to the periphery from the bottom, and flows out of the position between the two pipes, and the cooling effect on the metal wall face is formed. The stopper rod can effectively resist slag corrosion, and is matched with a water opening to control the slag flow, and the stopper rod can be widely applied to precise control over the slag flow in a liquid-state molten slag sensible heat recovery system.

Description

technical field [0001] The invention relates to the technical field of blast furnace slag waste heat recovery, in particular to a stopper used for controlling the flow of liquid slag. Background technique [0002] China is currently the world's largest steel producer, and its steel output has remained the world's largest for 17 consecutive years. In 2014, China's pig iron output reached 711 million tons, accounting for about 60% of the world's total output. In the process of smelting pig iron, blast furnace slag containing huge heat will be produced. The temperature of blast furnace slag is generally between 1400 ~ 1550 ℃, and each ton of slag contains (1260 ~ 1880) × 10 3 The sensible heat of kJ is equivalent to 60kg standard coal. Under the current ironmaking technology in my country, 0.3 tons of blast furnace slag is produced for every ton of pig iron produced. Based on the current pig iron production in my country of 711 million tons, it can be equivalent to producing ...

AI Technical Summary

Problems solved by technology

The specific reasons are as follows: 1. The conventional stopper rod is not resistant to the erosion of high-temperature slag, and it is easy to break after slag corrosion occurs; 2. The rod head part is a high-temperature refractory material, which is easy to be eroded, resulting in too short service life

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