A power recovery and cooling system using the waste heat of blast furnace slag flushing water

Abstract

The invention relates to a system capable of conducting power recovering and cooling by using waste heat of blast furnace slag flushing water, and belongs to the technical field of energy and environment. The system comprises a slag flushing water heat recovery and heat exchange system, an organic Rankine cycle, a steam injection type cooling system and a cooling water circulation system. An internal-thread stainless steel spiral tube shell-and-tube heat exchanger is used as a pre-heater, an external-thread stainless steel tube shell-and-tube heat exchanger is used as a steam generator, and the steam generator is also used as a gas-liquid separator. The system has the advantages of being simple in structure, easy to machine and manufacture, low in manufacturing cost, capable of preventing blockage, capable of realizing countercurrent flow heat exchange, high in heat exchange efficiency, capable of effectively utilizing waste heat of the slag flushing water and the like; the system can be independently used for generating electricity or providing prime power, can also be independently used for cooling and can further provide electric power and chilled water required by a cooling air conditioner at the same time.

Description

technical field [0001] The invention relates to a power recovery and cooling system utilizing waste heat of blast furnace slag flushing water, belonging to the technical field of energy and environment. Background technique [0002] Blast furnace slag washing water is a by-product of blast furnace ironmaking. As a low-temperature waste heat source, it has the characteristics of stable temperature, large flow rate, and high heat content. How to make slag washing water take advantage of waste heat utilization has gradually become a research topic. hot topics. At present, the blast furnace slag treatment process in my country is mainly the water quenching slag process. The high-temperature slag of 1400-1500 degrees in the blast furnace flows out through the slag mouth, and when it enters the slag flushing launder through the slag ditch, the water and the slag flow form a certain intersection angle with a certain amount of water, water pressure and launder gradient. Impact que...

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Problems solved by technology

[0003] The water temperature range of the circulating pool is 60-95°C, which is an industrial low-temperature waste heat source. If it is not utilized, this part of energy will be wasted

At present, for the waste heat utilization of blast furnace slag washing water, the main method is to directly use sensible heat to provide winter heating. This utilization method is simple in technology and low in transformation cost, but there are some problems: (1) The amount of slag washing water is large and the heat contained is very large However, the heating load of office buildings in general factory areas is relatively small, and the residual heat capacity of slag washing water cannot be fully utilized; (2) heating is only suitable for northern cities in winter, not in summer, while southern cities use it all year round. There is no need for heating, so this method has limitations; (3) The slag flushing water contains a lot of impurities, which is easy to cause blockage after entering the pipe network, and the heating pipe network system is huge, making it very difficult to clean

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