A heat extraction process system for blast furnace slag flushing water

Abstract

The invention relates to a blast furnace cinder flushing water heat recovery technological process system used for a cinder flushing water system with two cinder flushing water cooling towers and cooling tower pumps. The technological process system comprises two heat exchange units connected with the two cinder flushing water cooling towers in parallel, wherein secondary water outlet pipelines of the two heat exchange units are connected with a secondary water switching valve bank, secondary water supply pumps and a peak shaving unit in series in sequence; the tail end of the peak shaving unit is connected with a secondary water supply end; and secondary water inlet pipelines of the two heat exchange units are connected with a secondary water return end via a water inlet pipe of the secondary water switching valve bank. The technological process system has the beneficial effects that the heat exchange units are connected with the cooling towers in parallel, and the heat recovery system is unnecessary to be provided with the cinder flushing water pumps by utilizing the cooling tower pumps; continuous hot water supply is achieved via the secondary water switching valve bank; the temperature after heat recovery from the cinder flushing water is controlled by the peak shaving unit according to the heat load change and the cinder flushing water temperature change; and the system achieves full-water-volume and full-load heat recovery from the cinder flushing water, furthest recovers the waste heat of the cinder flushing water and can be used for heat supply for heating or other purposes.

Description

technical field [0001] The invention relates to a process flow system for recovering waste heat from blast furnace slag flushing water, in particular to a process flow system for taking heat from blast furnace slag flushing water with two sets of slag flushing water cooling towers and a cooling tower pump slag flushing water system. Background technique [0002] Blast furnace ironmaking produces a large amount of high-temperature slag, which produces a large amount of slag washing water at 60-90 °C after water quenching. Large blast furnaces generally include two sets of slag washing water systems with slag washing water cooling towers and cooling tower pumps. The slag washing water contains Solid particles especially contain a large amount of suspended matter. If direct heating will cause siltation and blockage in pipes and radiators, and indirect heat exchange using conventional heat exchangers will also cause blockage and cannot be used for a long period. Therefore, the wa...

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Problems solved by technology

[0002] Blast furnace ironmaking produces a large amount of high-temperature slag, which produces a large amount of slag washing water at 60-90 °C after water quenching. Large blast furnaces generally include two sets of slag washing water systems with slag washing water cooling towers and cooling tower pumps. The slag washing water contains Solid particles especially contain a large amount of suspended matter. If direct heating will cause siltation and blockage in pipes and radiators, and indirect heat exchange using conventional heat exchangers will also cause blockage and cannot be used for a long period. Therefore, the waste heat of slag washing water for many years None of them are fully and effectively recycled

In terms of process flow, the existing waste heat recovery system basically does not involve the discontinuity of blast furnace slag flushing, the control requirements of modern large-scale blast furnaces for the temperature of slag flushing water, and does not consider the heat extraction of the entire water and the process flow of the original blast furnace. switch operation problem

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