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System and method for generating steam from blast furnace slag

A water vapor and blast furnace slag technology, which is applied to furnaces, furnace components, and energy efficiency improvement, can solve problems such as shortening the service life of heat exchangers, corrosion of heat exchangers, and failure to use blast furnace slag washing water to reduce consumption , The effect of facilitating the utilization of waste heat

Active Publication Date: 2018-03-27
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • System and method for generating steam from blast furnace slag

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Embodiment 1

[0022] like figure 1 , The embodiment of the present invention provides a system for generating water vapor from blast furnace slag, including a buffer tank 2, a granulation tower 1 and a heat exchange mechanism. The entrance of the buffer tank 2 accepts the slag discharged from the blast furnace, and the outlet end communicates with the slag inlet of the granulation tower 1; wherein, the blast furnace slag is discharged into the buffer tank 2 through the slag ditch, and the bottom of the buffer tank 2 is drained The material pipeline is connected to the slag inlet of the granulation tower 1, and a discharge valve 10 is arranged on the discharge pipeline to control the flow rate of the slag entering the granulation tower 1. The granulation tower 1 is provided with a granulation water inlet, a water vapor outlet and a slag outlet, and the granulation water injected from the granulation water inlet quenches the slag discharged from the slag inlet to generate water Steam, the st...

Embodiment 2

[0028] The embodiment of the present invention relates to a method for generating water vapor from blast furnace slag, the method is as follows:

[0029] The buffer tank 2 receives the slag from the blast furnace, and continuously discharges the slag into the granulation tower 1 through the discharge valve 10 at the bottom of the buffer tank 2;

[0030] Spray granulation water into the granulation tower 1 to water-quench the slag to granulate the slag and generate water vapor. The granulated slag and slag are separated from water and discharged from the granulation tower 1. The water vapor is introduced into the heat exchange mechanism through the steam pipeline for further Waste heat utilization, the condensed water generated after the water vapor is heat-exchanged and condensed in the heat exchange mechanism is sent to the granulation tower 1 for recycling as granulation water;

[0031] Wherein, the granulation water level in the granulation tower 1, the pressure in the towe...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/08F27D17/00
CPCC21B3/08F27D17/004Y02P10/25
Inventor 施万玲
Owner WISDRI ENG & RES INC LTD
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