System and method for producing water vapor by blast furnace slag

Abstract

The invention relates to a system for producing water vapor by blast furnace slag. The system comprises a buffer tank, a pelletizing tower and a heat exchange mechanism. An inlet of the buffer tank receives the furnace slag discharged from a blast furnace, and an outlet end of the buffer tank communicates with a furnace slag inlet of the pelletizing tower. The pelletizing tower is provided with a pelletizing water inlet, a water vapor outlet and a furnace slag outlet. Pelletizing water sprayed from the pelletizing water inlet is used for carrying out water quenching on the furnace slag fed from the furnace slag inlet so as to generate water vapor, and the water vapor outlet communicates with the heat exchange mechanism through a steam pipeline. In addition, the invention relates to a method for producing water vapor by blast furnace slag, and the method is implemented on the basis of the system. The water vapor is used as a heat transmitting carrier, and impurities in blast furnace slag flushing water are prevented from causing scaling and corrosion to a heat exchanger and pipelines; the buffer tank can solve the problem that the water vapor is not stably generated due to discontinuous slag outputting of the blast furnace, slag flushing in the pelletizing tower is made continuous, and therefore the water vapor can be continuously generated in the pelletizing tower, and waste heat utilization of the blast furnace slag is facilitated.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a system and method for generating steam from blast furnace slag. Background technique [0002] The energy consumption of blast furnace smelting accounts for about 59% of the energy consumption of the entire iron and steel production, and is the first energy-consuming process in iron and steel plants. The blast furnace produces a large amount of high-temperature slag during the smelting process. Usually, the method of water quenching is used to rapidly cool the blast furnace slag. However, the waste heat of the low-temperature slag flushing water produced during the water quenching process is of low grade and contains various inorganic salts and scales, making it difficult to recover and utilize the waste heat. cause energy waste. According to statistics, about 0.3-0.6t of 1450-1650°C blast furnace slag is produced per 1 ton of molten iron, and each ...

AI Technical Summary

Problems solved by technology

In the north of our country, the heat of blast furnace slag flushing water has been used for building heating, and good economic benefits have been achieved. However, the corrosion of blast furnace slag water to the heat exchanger shortens the service life of the heat exchanger, and in non-heating seasons and The blast furnace slag washing water in the south is basically not used

In addition, blast furnace slag discharge is intermittent, which also brings inconvenience to the utilization of blast furnace slag waste heat

Images