A blast furnace dehumidification blast system based on slag flushing water waste heat recovery

Abstract

This application relates to the field of energy-saving technology in iron and steel smelting, specifically to a blast furnace dehumidification blast system based on slag flushing water waste heat recovery. The system includes a high-efficiency heat exchanger, a blast furnace slag flushing water waste heat recovery device, and a lithium bromide chiller unit. The high-efficiency heat exchanger is used to cool hot air and provide cooling gas to the blower inlet; its inlet end is equipped with a filter, and a mist eliminator is installed between it and the blower inlet. The blast furnace slag flushing water waste heat recovery device is used to recover waste heat from the slag flushing water. The lithium bromide chiller unit is used to utilize the waste heat of the slag flushing water for cooling, providing chilled water to the high-efficiency heat exchanger. The system also includes slag flushing water cooling pipelines, clean circulating water pipelines, chilled water circulating pipelines, and cooling water circulating pipelines to achieve efficient heat transfer and utilization. This invention improves the energy efficiency of the system by recovering and utilizing the waste heat of the blast furnace slag flushing water to provide cooling and dehumidifying gas to the blower.

Description

Technical Field

[0001] This application relates to the field of energy-saving technology in iron and steel smelting, specifically to a blast furnace dehumidification blast system based on slag flushing water waste heat recovery. Background Technology

[0002] With the development of the steel industry, energy conservation, emission reduction, and waste heat utilization have become key areas of focus for the industry. In the blast furnace smelting process, the slag flushing water system and the blast furnace blast system are two important energy-consuming links. The blast furnace slag flushing water absorbs a large amount of heat during the flushing process, typically reaching temperatures of 80-90℃, and contains abundant low-grade heat energy. Meanwhile, the blast furnace blast system needs to dehumidify the air entering the blast furnace to reduce the blast furnace coke ratio and energy consumption.

[0003] However, existing technologies still have the following problems: First, the recovery and utilization of large amounts of low-temperature waste heat in the steel industry is difficult and costly, resulting in low waste heat utilization rates. In particular, the waste heat from blast furnace slag flushing water has low temperature levels and large fluctuations, making traditional recovery methods inefficient and unable to fully utilize this energy. Second, current blast furnace dehumidification blasting technology mainly relies on electric cooling, which consumes a large amount of electricity, resulting in high operating costs and low energy utilization efficiency. Furthermore, existing waste heat recovery and dehumidification blasting systems lack integration, have high system complexity, and limited heat exchange efficiency, making it difficult to achieve efficient energy cascade utilization. These technological deficiencies lead to high energy consumption and increased production costs for steel enterprises, hindering the industry's sustainable development and the achievement of carbon emission reduction targets. Utility Model Content

[0004] In order to improve the utilization rate of waste heat in the steelmaking process and reduce energy waste, this application provides a blast furnace dehumidification blast system based on slag flushing water waste heat recovery.

[0005] This application provides a blast furnace dehumidification blast system based on slag flushing water waste heat recovery, which adopts the following technical solution:

[0006] A blast furnace dehumidification blast system based on slag flushing water waste heat recovery includes:

[0007] A high-efficiency heat exchanger is used to cool hot air and provide cooling gas to the blower inlet;

[0008] A waste heat recovery device for blast furnace slag flushing water is used to recover waste heat from the slag flushing water.

[0009] A lithium bromide refrigeration unit is used to utilize the waste heat from slag flushing water for refrigeration, providing chilled water for the high-efficiency heat exchanger.

[0010] In one specific implementation, a filter is provided at the inlet end of the high-efficiency heat exchanger.

[0011] In one specific implementation, a mist eliminator is provided between the transducer and the blower inlet.

[0012] In one specific implementation scheme, the system further includes a slag flushing water cooling circulation pipeline, one end of which is connected to the blast furnace slag flushing water waste heat recovery device, and the other end is connected to the blast furnace slag flushing water.

[0013] In one specific implementation scheme, a clean circulating water pipeline connects the lithium bromide chiller unit and the blast furnace slag flushing water waste heat recovery device, and the clean circulating water pipeline is used to transfer the heat of the slag flushing water to the lithium bromide chiller unit.

[0014] In one specific implementation scheme, a chilled water circulation pipeline connects the high-efficiency heat exchanger and the lithium bromide chiller unit, and the chilled water circulation pipeline is used to send the chilled water generated by the lithium bromide chiller unit to the high-efficiency heat exchanger.

[0015] In one specific implementation, the lithium bromide refrigeration unit is provided with a cooling water circulation pipeline, which is used to remove heat from the chilled water circulation pipeline and the clean water circulation pipeline.

[0016] In one specific implementation, a chilled water pump is also included, which is disposed on the chilled water circulation pipeline.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. The blast furnace dehumidification blower system is set up to recover the waste heat in the steelmaking process through a high-efficiency heat exchanger, continuously generate clean circulating water at about 75~85℃, and directly enter the lithium bromide chiller unit to drive the unit operation. There is no need to set up energy storage equipment, which makes better use of the energy in the slag flushing water, improves the utilization rate of waste heat in the steelmaking process, and facilitates the achievement of the goal of energy conservation and emission reduction in the steel industry. Attached Figure Description

[0019] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0020] Figure 1 This is a schematic diagram of the overall structure of a blast furnace dehumidification blast system based on slag flushing water waste heat recovery according to an embodiment of this application.

[0021] Attached Figure Descriptions: 1. High-efficiency heat exchanger; 2. Waste heat recovery device for blast furnace slag flushing water; 3. Lithium bromide refrigeration unit; 4. Filter; 5. Mist eliminator; 6. Slag flushing water cooling circulation pipeline; 7. Clean circulating water circulation pipeline; 8. Chilled water circulation pipeline; 9. Cooling water circulation pipeline; 10. Chilled water pump. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0024] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0025] This application discloses a blast furnace dehumidification blast system based on slag flushing water waste heat recovery.

[0026] Reference Figure 1 A blast furnace dehumidification blast system based on slag flushing water waste heat recovery includes a high-efficiency heat exchanger 1, a blast furnace slag flushing water waste heat recovery device 2, and a lithium bromide refrigeration unit 3.

[0027] The high-efficiency heat exchanger 1 is used to cool hot air and provide cooling gas to the blower inlet. A filter 4 is installed at the inlet of the high-efficiency heat exchanger 1. The filter 4 filters out impurities and dust from the air entering the high-efficiency heat exchanger 1, preventing impurities from entering the heat exchange system and causing blockage or damage, thus improving the stability and reliability of the system operation. The high-efficiency heat exchanger 1 transfers heat from the hot air to chilled water through its internal heat exchange structure, thereby lowering the temperature of the hot air. The cooled air after heat exchange is then transported through pipes to the blower inlet, providing the blast furnace blast with air of suitable temperature and low humidity.

[0028] A mist eliminator 5 is installed between the high-efficiency heat exchanger 1 and the blower inlet. The mist eliminator 5 can effectively trap water droplets and mist droplets in the air, prevent liquid water from entering the blower system and avoid damage to the blower, and further reduce the humidity of the air fed into the blast furnace, thereby improving the blast furnace smelting efficiency.

[0029] The blast furnace slag flushing water waste heat recovery device 2 is used to recover waste heat from the slag flushing water. This device is connected to the blast furnace slag flushing water via a slag flushing water cooling circulation pipe 6. A clean circulating water circulation pipe 7 connects the blast furnace slag flushing water waste heat recovery device 2 to the lithium bromide chiller unit 3. The lithium bromide chiller unit 3 utilizes the waste heat from the slag flushing water for cooling, providing chilled water for the high-efficiency heat exchanger 1. The clean circulating water circulation pipe 7 transfers heat from the slag flushing water to the lithium bromide chiller unit 3. The blast furnace slag flushing water enters the blast furnace slag flushing water waste heat recovery device 2 through the slag flushing water cooling circulation pipe 6, where it exchanges heat with the clean circulating water, transferring heat to the clean circulating water while simultaneously lowering its temperature, thus achieving cooling. The blast furnace slag flushing water waste heat recovery device 2 adopts a high-efficiency plate heat exchanger design, featuring high heat exchange efficiency, low scaling, and easy cleaning, effectively recovering heat from the slag flushing water. After absorbing the heat of the slag flushing water in the blast furnace slag flushing water waste heat recovery device 2, the clean circulating water flows into the lithium bromide chiller unit 3 through the clean circulating water circulation pipeline 7, providing a heat source for the lithium bromide chiller unit 3.

[0030] A chilled water circulation pipe 8 connects the high-efficiency heat exchanger 1 and the lithium bromide chiller unit 3. The chilled water circulation pipe 8 is used to send the chilled water produced by the lithium bromide chiller unit 3 to the high-efficiency heat exchanger 1. After absorbing heat from the hot air in the high-efficiency heat exchanger 1, the chilled water temperature rises, and then flows back to the lithium bromide chiller unit 3 through the chilled water circulation pipe 8 for cooling. The cooled chilled water then re-enters the high-efficiency heat exchanger 1, forming a cycle.

[0031] A chilled water pump 10 is installed on the chilled water circulation pipeline 8. The chilled water pump 10 provides power for the chilled water circulation, ensuring smooth circulation of chilled water between the high-efficiency heat exchanger 1 and the lithium bromide chiller unit 3. The flow rate and head of the chilled water pump 10 are designed according to system requirements to meet the system's heat exchange requirements.

[0032] The lithium bromide chiller unit 3 is equipped with a cooling water circulation pipe 9, which is used to remove heat from the chilled water circulation pipe and the clean water circulation pipe 7. After absorbing heat in the absorber and condenser of the lithium bromide chiller unit 3, the cooling water dissipates the heat to the atmosphere through a cooling tower or other cooling equipment. The cooled water then re-enters the lithium bromide chiller unit 3, forming a cycle.

[0033] This system utilizes the waste heat from blast furnace slag flushing water as a heat source for the lithium bromide chiller unit 3, achieving cascaded energy utilization and significantly reducing system energy consumption. Simultaneously, the high-efficiency heat exchanger 1 cools and dehumidifies the air entering the blower, improving blast furnace smelting efficiency and stability. The entire system has a compact structure, with all components working collaboratively to achieve the dual goals of efficient recovery and utilization of slag flushing water waste heat and blower dehumidification.

[0034] The working principle of the blast furnace dehumidification blower system based on slag flushing water waste heat recovery is as follows: Outside air first enters filter 4 to remove dust and other impurities, then enters high-efficiency heat exchanger 1, where it exchanges heat with chilled water generated by lithium bromide refrigeration unit 3, lowering the temperature below the dew point temperature, causing moisture in the air to condense and precipitate. The dried air, after moisture removal, enters demister to remove residual water mist, and finally enters the blast furnace blower inlet.

[0035] In the blast furnace slag flushing water waste heat recovery device 2, the slag flushing water cooling circulation pipeline 6 exchanges heat with the clean circulating water circulation pipeline 7, generating clean circulating water at 75-85°C. This clean circulating water is then sent to the lithium bromide chiller unit 3 via the clean circulating water circulation pipeline 7. The lithium bromide chiller unit 3 cools the chilled water in the chilled water circulation pipeline 8 to 7°C and sends it into the high-efficiency heat exchanger 1. Outside air exchanges heat with the chilled water in the high-efficiency heat exchanger 1. After heat exchange, the chilled water is pressurized by the chilled water pump 10 and returned to the lithium bromide chiller unit 3, completing the chilled water circulation.

[0036] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.

Claims

1. A blast furnace dehumidification blast system based on slag flushing water waste heat recovery, characterized in that, include: A high-efficiency heat exchanger (1) includes a heat exchange structure for cooling hot air and providing cooling gas to the blower inlet; A waste heat recovery device for blast furnace slag flushing water (2) includes a high-efficiency plate heat exchanger for recovering waste heat from slag flushing water. The lithium bromide refrigeration unit (3) includes an absorber, a condenser, and a cooling device, which is used to utilize the waste heat of the slag flushing water for refrigeration and to provide chilled water for the high-efficiency heat exchanger (1). The inlet end of the high-efficiency heat exchanger (1) is equipped with a filter (4).

2. The blast furnace dehumidification blast system based on slag flushing water waste heat recovery according to claim 1, characterized in that, A mist eliminator (5) is provided between the high-efficiency heat exchanger (1) and the blower inlet.

3. The blast furnace dehumidification blast system based on slag flushing water waste heat recovery according to claim 1, characterized in that, It also includes a slag flushing water cooling circulation pipeline (6), one end of which is connected to the blast furnace slag flushing water waste heat recovery device (2), and the other end is connected to the blast furnace slag flushing water.

4. The blast furnace dehumidification blast system based on slag flushing water waste heat recovery according to claim 3, characterized in that, The lithium bromide chiller (3) is connected to the blast furnace slag flushing water waste heat recovery device (2) by a clean circulating water pipeline (7), which is used to transfer the heat of the slag flushing water to the lithium bromide chiller (3).

5. A blast furnace dehumidification blast system based on slag flushing water waste heat recovery according to claim 4, characterized in that, A chilled water circulation pipeline (8) is connected between the high-efficiency heat exchanger (1) and the lithium bromide refrigeration unit (3). The chilled water circulation pipeline (8) is used to send the chilled water generated by the lithium bromide refrigeration unit (3) to the high-efficiency heat exchanger (1).

6. A blast furnace dehumidification blast system based on slag flushing water waste heat recovery according to claim 5, characterized in that, The lithium bromide refrigeration unit (3) is equipped with a cooling water circulation pipe (9), which is used to remove heat from the chilled water circulation pipe (8) and the net circulating water circulation pipe (7).

7. A blast furnace dehumidification blast system based on slag flushing water waste heat recovery according to claim 5, characterized in that, It also includes a chilled water pump (10), which is installed on the chilled water circulation pipeline (8).

Images