Method and device for recycling residual heat of blast furnace low-temperature recirculated water with heat pump technology

Abstract

This invention relates to a recovery process and method of waste heat of blast furnace circulating water in the steel production, which installs heat pump unit on the pipeline to recover the waste heat in the of 40-50deg.C with the low-boiling working substance in the heat pump unit, and the cooled blast furnace circulating soft water enters the blast furnace circulating water system directly; the heat exchanger is installed on the water replenishing pipe of the steam boiler to provide the heat in the low-boiling working substance with waste heat and the driving heat of heat pump working to the fresh boiler water in the pipeline network beside the heat exchanger to increase the temperature to 70-80deg.C; the fresh boiler water through the heat exchanger is imported to the boiler system. This invention realizes the recovery of the waste heat in the blast furnace low-temperature circulating water by the installation of heat pump unit and heat exchanger without big alteration and applies the heat on the preheating of the fresh water in the steam boiler to save the needed steam and energy.

Description

technical field [0001] The invention relates to a method and equipment for recovering waste heat of blast furnace circulating water in the process of iron and steel production, in particular to a method and equipment for recovering waste heat of blast furnace circulating water for water preheating of thermoelectric boilers. Background technique [0002] With the increasingly tense energy sources, energy conservation and emission reduction have become important tasks. A large amount of low-temperature waste heat is generated in the process of steel production, especially the waste heat of low-temperature circulating water at 40-80°C. According to statistics, this part of the heat loss accounts for more than 60% of the energy loss in steel production. Due to the low temperature of circulating water, it is difficult to effectively use it. For a long time, this part of energy has basically been dissipated through cooling towers, which not only caused a lot of waste of energy and...

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Problems solved by technology

[0004] Aiming at the utilization of low-temperature circulating water waste heat in the metallurgical production process, the purpose of the present invention is to provide a method and equipment for recovering the waste heat of blast furnace circulating water. The principle of the present invention is based on the existing blast furnace circulating water system and steam boiler water supply system In addition, add heat pump unit and heat exchange device, use the principle, method and related equipment of heat pump to cool the blast furnace circulating water, preheat the new water of the boiler, replace the heat in the blast furnace circulating water as much as possible, and apply it to the thermoelectric boiler. To the purpose of saving energy and reducing consumption

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