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 two cinder flushing water systems without cinder flushing water cooling towers but with storage tank cinder flushing pumps. The technological process system comprises a blast furnace and two cinder flushing water systems with storage tank cinder flushing pumps of the blast furnace and is characterized in that the technological process system also comprises two heat exchange units respectively connected with the two cinder flushing water systems in series, wherein secondary water outlet pipelines of the two heat exchange units are connected with a secondary water switching valve bank, 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 the secondary water switching valve bank. The technological process system has the beneficial effects that continuous hot water supply is achieved via the secondary water switching valve bank; the secondary water supply temperature is adjusted by the peak shaving unit according to the heat load change and the cinder flushing water temperature change to achieve control of the temperature after heat recovery from the cinder flushing water; 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 recovery of waste heat from blast furnace slag flushing water, in particular to a blast furnace slag flushing water extraction system with two sets of slag flushing water cooling towers and a slag flushing pump in a storage pool. Thermal process 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. At present, some blast furnaces do not have a slag washing water system with a slag washing water cooling tower and a cooling tower pump, but use a water storage tank to wash slag. The slag flushing water system of the pump, the slag flushing water contains solid particles, especially a large amount of suspended matter, if direct heating will cause siltation and blockage in the pipes and radiators, and conventional heat exchangers for indirect heat exchange will al...

AI Technical Summary

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. At present, some blast furnaces do not have a slag washing water system with a slag washing water cooling tower and a cooling tower pump, but use a water storage tank to wash slag. The slag flushing water system of the pump, the slag flushing water contains solid particles, especially a large amount of suspended matter, if direct heating will cause siltation and blockage in the pipes and radiators, and conventional heat exchangers for indirect heat exchange will also be blocked and cannot be maintained for a long time Therefore, the waste heat of slag flushing water has not been fully and effectively recycled for many years

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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