Blast furnace slag water heat exchange device

Abstract

The utility model relates to a blast furnace slag water heat exchange device, including slag water pool, the water outlet of slag water pool connects the joint of three ways, the second joint of three ways passes through first pipeline and connects cooling tower, and the water outlet of cooling tower passes through second pipeline and connects blast furnace, and the third joint of three ways passes through third pipeline and connects the heat medium pipeline water inlet end of plate heat exchanger, and the slag water pool has adsorption structure, and the coolant water outlet end of plate heat exchanger passes through fourth pipeline and connects user, and fourth pipeline has temperature detection device, electric heating device. Cancel the traditional long shaft under the slag water pump, through the overflow mode to guide the slag water to the plate exchange and cooling tower, in the scheme, the height of cooling tower and the plate exchange needs to be lower than slag water pool, and the flow is carried out with the aid of gravity, thereby saving the cost, reducing the energy consumption, and the overflow mode makes the slag water to carry out the sedimentation type filtration in the slag water pool, reduces the slag (slag cotton) and the iron fillings to carry out the plate exchange and cooling tower, improves the service life of plate exchange and cooling tower.

Description

Technical Field

[0001] This utility model relates to the field of slag water waste heat utilization technology, specifically a blast furnace slag water heat exchange device. Background Technology

[0002] In the steel production process, blast furnace slag water carries a large amount of waste heat, and its efficient recovery and utilization are crucial for enterprises to save energy and reduce consumption. After the heat exchange station (system) in the power plant supply workshop of Jiangsu Shagang Group Huaigang Special Steel Co., Ltd. was put into operation in September 2024, the following problems were exposed: 1. Slag water temperature does not meet the standard: The slag water in the new blast furnace is maintained at around 50°C for a long time, and only reaches 70°C when iron is tapped. This cannot meet the heat exchange design requirements of 60°C in winter and 70°C in summer, resulting in insufficient hot water temperature supplied to external users.

[0003] 2. Frequent failures of slag pumps: Due to the presence of slag wool and iron filings in the slag water, long-shaft submersible slag pumps have experienced multiple problems such as blockage, leakage, and bearing damage within 3 months of operation, resulting in high maintenance costs.

[0004] 3. Slag wool and iron filings in the slag water can enter the plate heat exchanger and cooling tower through the pipes. This process can cause pipe blockage and reduce the service life of the cooling tower and plate heat exchanger.

[0005] The heat exchange station includes a slag water pool. The slag water pool is pumped out by a long-shaft submersible slag water pump and sent to two separate paths to a plate heat exchanger and a cooling tower. After being cooled by the cooling tower, the slag water is sent to the blast furnace for reuse. The slag water that has been heat-exchanged by the plate heat exchanger is discharged. The clean water that has exchanged heat with the slag water in the plate heat exchanger is sent to the user. Summary of the Invention

[0006] This invention provides a blast furnace slag water heat exchange device that eliminates the traditional long-shaft submersible slag water pump. Instead, it guides the slag water to the plate heat exchanger and cooling tower via overflow. In this design, the cooling tower and plate heat exchanger are located below the slag water pool, allowing the slag water to flow by gravity, thus saving costs and reducing energy consumption. Furthermore, the overflow method allows the slag water to undergo sedimentation filtration within the slag water pool, reducing the amount of slag (slag wool) and iron filings passing through the plate heat exchanger and cooling tower, thereby extending the service life of the plate heat exchanger and cooling tower.

[0007] The technical solution adopted by this utility model is: a blast furnace slag water heat exchange device, including a slag water pool, the outlet of the slag water pool is connected to a joint of a tee, the second joint of the tee is connected to a cooling tower through a first pipe, the outlet of the cooling tower is connected to the blast furnace through a second pipe, the third joint of the tee is connected to the inlet end of the heat medium pipe of a plate heat exchanger through a third pipe, the slag water pool has an adsorption structure, the outlet end of the plate heat exchanger is connected to the user through a fourth pipe, and the fourth pipe has a temperature detection device and an electric heating device.

[0008] Based on the above scheme, as a preferred embodiment, the sludge tank includes a first side wall, a second side wall, a third side wall, and a fourth side wall that are fixed to the bottom plate and connected end to end. The bottom of the first side wall has a water inlet. One end of the partition is fixedly connected to the second side wall, and the other end is fixedly connected to the fourth side wall, dividing the area inside the shell into a first area on the left and a second area on the right. The upper end of the partition has a first overflow hole.

[0009] Based on the above scheme, as a preferred option, at least a first filter screen is provided in the first area, and several cubic containers with hollowed-out surfaces are placed on the base plate corresponding to the first area, with several pieces of sand and gravel placed inside each cubic container.

[0010] Based on the above scheme, as a preferred option, a magnet is fixedly installed in the second area. The magnet is a hollow cylinder with its axis pointing left and right. A fifth pipe is installed at the first overflow hole. The lower end of the fifth pipe has a horizontal section that extends into the magnet. The diameter of the horizontal section is smaller than the inner diameter of the magnet.

[0011] Based on the above scheme, as a preferred option, the magnet is mounted in the second area by a support frame.

[0012] Based on the above scheme, as a preferred option, the outlet is a second overflow hole set on the third side wall, and a tee is fixedly installed at the second overflow hole.

[0013] Based on the above scheme, as a preferred option, the temperature detection device is a temperature sensor, which is located behind the electric heating device.

[0014] The present invention has the following technical advantages: The traditional long-shaft submersible slag pump is eliminated. Instead, the slag water is guided to the heat exchanger and cooling tower via overflow. In this solution, the height of the cooling tower and heat exchanger needs to be lower than the slag water pool, allowing the water to flow by gravity. This saves costs and reduces energy consumption. Furthermore, the overflow method allows the slag water to undergo sedimentation filtration in the slag water pool, reducing the amount of slag (slag wool) and iron filings that need to be transferred to the heat exchanger and cooling tower, thus extending their service life.

[0015] While overflowing, the slag and water pool is designed in sections, and the first section is filtered and blocked by screens and sand to reduce the amount of slag and iron filings entering the second section.

[0016] The magnet extends into the hollow cylinder through the horizontal section of the fifth pipe. On the one hand, the cylinder magnetically attracts iron filings, and on the other hand, its sidewalls obstruct the lifting force (the lifting force generated by the water flow) on the iron filings and slag, causing them to settle.

[0017] The temperature sensor is located behind the electric heating unit. This front-to-back position is used to ensure the user's water temperature requirements are met. When the temperature sensor detects that the water temperature is too low, the power of the electric heating unit can be manually turned on or increased; conversely, it can be turned off or decreased, thus ensuring that the water temperature meets the user's needs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0019] To further understand this utility model, the following detailed description is provided in conjunction with embodiments. However, this is not intended to limit the scope of the utility model. It should be understood that these descriptions are only for further illustrating the features and advantages of the utility model, and not for limiting the scope of the claims. Any equivalent substitutions made in the art based on the disclosure of this utility model are within the protection scope of this utility model.

[0020] like Figure 1 As shown, a blast furnace slag water heat exchange device includes a slag water pool 1. The outlet of the slag water pool is connected to a joint of a tee 2. The second joint of the tee is connected to a cooling tower through a first pipe 3. The outlet of the cooling tower is connected to the blast furnace through a second pipe. The third joint of the tee is connected to the inlet of the heat medium pipe of a plate heat exchanger 5 through a third pipe 4. The outlet of the heat medium pipe of the plate heat exchanger 5 is connected to the cooling tower. The slag water pool has an adsorption structure. The inlet of the plate heat exchanger is connected to a cold medium source. The outlet of the plate heat exchanger is connected to a user 9 through a fourth pipe 6. The fourth pipe has a temperature detection device 7 and an electric heating device 8. In this scheme, slag water is the heat medium, purified water is the cold medium, the cold medium source is a purified water tank, and the water tank is connected to the municipal water supply network.

[0021] In this invention, the traditional long-shaft submersible slag pump is eliminated. Instead, the slag water is guided to the heat exchanger and cooling tower via overflow. In this design, the height of the cooling tower and heat exchanger needs to be lower than that of the slag water pool, allowing the water to flow by gravity. This saves costs and reduces energy consumption. Furthermore, the overflow method allows the slag water to undergo sedimentation filtration within the slag water pool, reducing the amount of slag (slag wool) and iron filings in the heat exchanger and cooling tower, thus extending their service life.

[0022] In Example 1, while slag itself has a higher density than water, the contact between molten slag and water during water quenching generates a large amount of steam. Some of this steam may be trapped by the rapidly cooling slag particles, forming tiny pores. Simultaneously, the crushing process of the slag particles may also create a loose, porous structure. These pores reduce the bulk density of the slag. Furthermore, the high-speed water flow during water quenching generates a lifting force, causing scum to form on the surface of the slag slurry entering the slag slurry pool. Although the scum will eventually settle as the water flow stabilizes and the gas escapes, in this design, the blast furnace slag slurry directly enters the slag slurry pool, which does not have sufficient time to stabilize. Therefore, to prevent slag and iron filings from entering... The heat exchanger and cooling tower are designed as follows: The slag and water tank includes a first sidewall 10, a second sidewall, a third sidewall 11, and a fourth sidewall, which are fixed to the bottom plate and connected end to end. The bottom of the first sidewall has a water inlet 12. One end of a partition 13 is fixedly connected to the second sidewall, and the other end is fixedly connected to the fourth sidewall, dividing the area inside the shell into a first area 14 on the left and a second area 15 on the right. The upper end of the partition has a first overflow hole 16. At least one first filter screen 17 is provided in the first area. Several cubic containers 18 with perforated surfaces are placed on the bottom plate corresponding to the first area, and several pieces of sand and gravel 19 are placed in each cubic container. During overflow, the slag and water tank is designed in sections, and the first area is filtered and blocked by the filter screen and sand and gravel to reduce the entry of slag and iron filings into the second area.

[0023] The first filter screen has a mesh size of 1-1.5mm. The mesh size of the first filter screen should not be too small to avoid affecting the water flow rate.

[0024] In Example 2, due to the large mesh size of the first filter screen, although the first area is filtered by overflow and sand, some iron filings still enter the second area. To improve the filtration effect, the following design is made: A magnet 20 is fixedly installed in the second area. The magnet is a hollow cylinder with its axis pointing left and right. A fifth pipe 21 is installed at the first overflow hole. The lower end of the fifth pipe has a horizontal section 22 that extends into the magnet, and the diameter of the horizontal section is smaller than the inner diameter of the magnet. Through the horizontal section of the fifth pipe extending into the hollow cylinder magnet, the cylinder magnetically attracts the iron filings, and its sidewalls impede the lifting force (the lifting force generated by the water flow) on the iron filings and slag, causing them to settle.

[0025] The magnet is mounted on a support frame 23 in the second area, allowing it to attract iron filings circumferentially. The outlet is a second overflow hole 24 located on the third side wall, with a tee fixedly installed at the overflow hole. The temperature detection device is a temperature sensor located behind the electric heating device. This relative position ensures the user's water temperature meets their needs. When the temperature sensor detects a low water temperature, the power of the electric heating device can be manually turned on or increased; conversely, it can be turned off or decreased, ensuring the water temperature meets the user's requirements. This refers to users within the factory area who require hot water, excluding residential users outside the factory area. Of course, manual adjustment can be replaced by automated adjustment.

[0026] The preferred embodiments of this utility model have been described in detail above. However, it should be understood that the above description is for illustrative purposes only and does not constitute any limitation on the scope of this utility model. Those skilled in the art can make substitutions or changes to certain features of this utility model without departing from the spirit and scope of this utility model, and such substitutions or changes should be considered to fall within the protection scope of the claims of this utility model.

Claims

1. A blast furnace slag water heat exchange device, comprising a slag water tank, characterized in that, The outlet of the slag water tank is connected to one joint of a tee. The second joint of the tee is connected to the cooling tower through the first pipe. The outlet of the cooling tower is connected to the blast furnace through the second pipe. The third joint of the tee is connected to the inlet of the heat medium pipe of the plate heat exchanger through the third pipe. The slag water tank has an adsorption structure. The outlet of the cold medium of the plate heat exchanger is connected to the user through the fourth pipe. The fourth pipe has a temperature detection device and an electric heating device.

2. The blast furnace slag water heat exchanger as described in claim 1, characterized in that, The sludge tank includes a first side wall, a second side wall, a third side wall, and a fourth side wall that are fixed to the bottom plate and connected end to end. The bottom of the first side wall has a water inlet. One end of the partition is fixedly connected to the second side wall, and the other end is fixedly connected to the fourth side wall, dividing the area inside the shell into a first area on the left and a second area on the right. The upper end of the partition has a first overflow hole.

3. The blast furnace slag water heat exchanger as described in claim 2, characterized in that, At least one filter screen is provided in the first area, and several cubic containers with hollowed-out surfaces are placed on the base plate corresponding to the first area, with several pieces of sand and gravel placed inside each cubic container.

4. The blast furnace slag water heat exchanger as described in claim 3, characterized in that, The mesh size of the first filter is 1-1.5mm.

5. The blast furnace slag water heat exchanger as described in claim 4, characterized in that, A magnet is fixedly installed in the second area. The magnet is a hollow cylinder with its axis pointing left and right. A fifth pipe is installed at the first overflow hole. The lower end of the fifth pipe has a horizontal section that extends into the magnet. The diameter of the horizontal section is smaller than the inner diameter of the magnet.

6. The blast furnace slag water heat exchanger as described in claim 5, characterized in that, The magnet is mounted in the second area via a support frame.

7. The blast furnace slag water heat exchanger as described in claim 2, characterized in that, The outlet is a second overflow hole located on the third side wall, and a tee is fixedly installed at the second overflow hole.

8. The blast furnace slag water heat exchanger as described in claim 2, characterized in that, The temperature detection device is a temperature sensor, which is located behind the electric heating device.

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