Bottom filtration method slag treatment system and control method thereof

Abstract

The invention discloses a bottom filtration method slag treatment system and a control method thereof, and relates to the technical field of blast furnace slag treatment systems. According to the bottom filtration method slag treatment system and the control method thereof, the bottom filtration method slag treatment system comprises a filtration tank liquid level monitoring system, a slag flushing water pressure control system and a pipeline flow control system, the filtration tank liquid level monitoring system can accurately display the liquid level of a filtration tank, slag grabbing with water or air inflow of a water pump is avoided, leakage of a slag-water mixture during truck loading is prevented, and the service life of the water pump can be prolonged; by the aid of the slag flushing water pressure control system, the slag flushing water pressure can be accurately controlled, foam slag and cotton slag are avoided, the service life of the filtration tank is prolonged, and slag flushing point explosion accidents are avoided; by the aid of the pipeline flow control system, water balance of a hot water pipeline and a slag flushing pipeline is realized, frequent start and stop of a hot water pump due to unbalanced water are avoided, the service life of the hot water pump is prolonged, and powerful guarantee is provided for 'one-key slag flushing'.

Description

technical field [0001] The invention relates to the technical field of blast furnace slag processing systems, and more specifically relates to a bottom filtration slag processing system and a control method thereof. Background technique [0002] In the existing blast furnace slag bottom filtration treatment process, the blast furnace slag flows into the granulation tower through the slag ditch, and is crushed, quenched and granulated by the high-speed water flow sprayed out by the granulator installed in the granulation tower, and then granulated One-step soaking and quenching in the chemical tower; the quenched slag-water mixture flows into the filter tank through the outlet device, and the slag washing water is sent to the cooling tower for recycling after being filtered by the filter material in the filter tank. The slag stays on the upper layer of the filter material in the filter tank, waiting for driving to grab the slag. [0003] At present, the following problems ex...

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Problems solved by technology

[0004] (1) It is difficult to determine the liquid level in the filter tank

Because the water level in the filter tank is not easy to control, the situation of slag grabbing with water or water pump intake occurs

If the water level in the filter tank is too high, water will be carried during the slag grabbing process, resulting in more slag-water mixture being sprinkled on the road during vehicle transportation, resulting in waste of water resources and polluting the environment; if the filter tank has a heavy water level If it is too low, the pump will not pump water and it will inhale air, which will seriously affect the life of the pump and increase the workload of workers

[0005] (2) It is difficult to control the hydraulic pressure of slag flushing

In the water slag flushing process, if the slag flushing pressure is too small, the slag will not be completely crushed and granulated to produce a large amount of foamy slag, which will increase the processing capacity of the next process. When the unbroken slag is too large, it will be more Explosions may occur and cause production accidents; excessive slag flushing pressure will produce water slag and cotton residue with too small particle size, which will block the filter layer after entering the filter tank, affect the water permeability of the filter tank, accelerate hardening, and reduce the filter layer service life

[0006] (3) Water balance is difficult to adjust

In the absence of frequency conversion control of the hot water pump and the slag washing pump, the water permeability of the filter tank will change due to the difference in the amount of water slag in the filter tank and the time of commissioning, and the flow of the hot water pump and the slag washing pump is difficult to balance

The flow rate of the hot water pump is greater than the flow rate of the slag flushing pump, which will cause the water level in the filter pool to drop and cause the heat pump to enter the air or repeatedly start and stop the heat pump; When the water level in the filter pool is too high, it will overflow, waste water resources and pollute the environment

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