Energy-saving blast furnace circulating cooling water system

Abstract

The utility model discloses an energy-saving blast furnace circulating cooling water system which comprises a blast furnace, a water tank and a cooling tower, the interior of the water tank is divided into an upper hot water tank and a lower cold water tank through a partition plate, a sewer pipe communicated with the hot water tank and the cold water tank is arranged on the partition plate, and a sewer flow valve is arranged on the sewer pipe. A water outlet of the hot water tank is communicated with a water inlet of the cooling tower, a water inlet of the cold water tank is communicated with a water outlet of the cooling tower, the blast furnace is sequentially provided with a plurality of cooling assemblies in a segmented mode from bottom to top, a water outlet of each cooling assembly is communicated with the hot water tank, and a water inlet of each cooling assembly is provided with a cold water branch pipe. A cold water header pipe is arranged at the ends of the cold water branch pipes and communicated with the cold water tank, a thermolator is arranged on each cold water branch pipe, and a cold water inlet of each thermolator is communicated with a water outlet of the cooling tower. In conclusion, the utility model has the advantages that the energy consumption can be reduced, the cooling capacity of each part of the blast furnace can be timely adjusted, and safety and reliability are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace circulating cooling, and particularly relates to an energy-saving blast furnace circulating cooling water system. Background Technique

[0002] The blast furnace circulating cooling water system is an important part in the blast furnace smelting process, which is used to reduce the temperature of the blast furnace refractory materials so as to maintain a certain strength, maintain a reasonable operating furnace profile, realize the extension of the blast furnace life and safe production, and is also used to promote the formation of a protective slag skin, iron shell and graphite layer on the furnace lining to protect the furnace lining and replace the work of the furnace lining. At the same time, it is also used to protect the furnace shell and related metal components from the influence of high temperature and reduce damage. The existing structure of the blast furnace cooling water circulation system mainly includes a cold water tank, a hot water tank and several cooling towers. Cold water is introduced into the blast furnace from the cold water tank, and after heat exchange, it becomes hot water and flows to the hot water tank, and then is introduced into the cooling tower to be cooled into cold water and then sent back to the cold water tank to form a water cycle, saving water resources while realizing the cooling of the blast furnace.

[0003] The following problems are also found in the use process of the blast furnace cooling water circulation system: First, through practice, it can be known that the temperature difference between the inlet and outlet water of the blast furnace is generally about 2°C, that is, the temperature difference between the cold water tank and the hot water tank is generally about 2°C, but the designed temperature of the cooling tower is generally about 10°C, and its cooling effect is often much greater than the cooling requirement of the blast furnace circulating water. Although it meets the use needs, a large amount of energy is wasted for the cooling of the circulating water, increasing the production cost. At the same time, pumping hot water from the hot water tank to the cooling tower also consumes a large amount of heat. Second, most of the existing blast furnace cooling equipment adopts a constant flow water supply method in series from bottom to top. However, during the production of the blast furnace, the temperatures and slag skin conditions at different heights and different intervals are different, and the required local cooling intensity requirements are also different. When the local furnace condition of the blast furnace is abnormal, the normal cooling intensity cannot provide the cooling water required to take away the high heat load, resulting in the problem that the cooling equipment is damaged due to overheating. Therefore, it is objectively necessary to develop and manufacture an energy-saving blast furnace circulating cooling water system that can reduce energy consumption, the cooling capacity of each part of the blast furnace can be adjusted in time, and is safe and reliable. Content of the Utility Model

[0004] The purpose of the utility model is to provide an energy-saving blast furnace circulating cooling water system that can reduce energy consumption, the cooling capacity of each part of the blast furnace can be adjusted in time, and is safe and reliable.

[0005] The object of the present utility model is achieved as follows. It includes a blast furnace, a water tank and a cooling tower. The interior of the water tank is divided into a hot water tank above and a cold water tank below by a partition. A downcomer connecting the hot water tank and the cold water tank is provided on the partition, and a downcomer flow valve is arranged on the downcomer. The water outlet of the hot water tank is communicated with the water inlet of the cooling tower, and the water inlet of the cold water tank is communicated with the water outlet of the cooling tower. The blast furnace is successively provided with a number of cooling components in sections from bottom to top. The water outlets of each cooling component are communicated with the hot water tank, and a cold water branch pipe is arranged at the water inlet of each cooling component. The end of the cold water branch pipe is provided with a cold water main pipe, and the cold water main pipe is communicated with the cold water tank. A temperature regulator is arranged on each cold water branch pipe, and the cold water inlet of the temperature regulator is communicated with the water outlet of the cooling tower.

[0006] Further, the temperature regulator includes a sealed housing and a water distribution pipe concentrically arranged in the housing. One end of the housing is communicated with the water inlet of the cooling component on the blast furnace, and the other end is communicated with the water outlet of the cold water tank. Both ends of the water distribution pipe are blocked, and a number of spray holes are evenly machined on the water distribution pipe. A cold water pipe communicated with the water outlet of the cooling tower is arranged on the housing, and the end of the cold water pipe extends into the housing and is communicated with the water distribution pipe.

[0007] Further, exhaust ports are arranged at the tops of the hot water tank and the cold water tank.

[0008] Further, a stirrer is arranged in the cold water tank.

[0009] Further, a filter is arranged on the cold water main pipe.

[0010] Further, a make-up water pipe is connected to the cold water tank.

[0011] When the utility model is in operation, the cooling water is divided into multiple strands, and each strand of cooling water enters a corresponding cooling component on the blast furnace. After absorbing heat, it becomes hot water, which is all introduced into the hot water tank and then divided into two strands. One strand is introduced into the cooling tower, where it is cooled to obtain cold water with a lower temperature, and then the cold water is introduced into the cold water tank. The other strand flows into the cold water tank through the drain pipe arranged on the bottom partition of the hot water tank. In this way, the cold water and hot water are fully mixed in the cold water tank, making the water temperature of the mixed water slightly lower than the normal water supply temperature required by the blast furnace production process. Then it is divided into multiple strands and introduced into the corresponding cooling components on the blast furnace, forming a complete water resource utilization cycle. While saving water resources, it reduces the discharge of hot water and avoids environmental pollution. In the above process, the hot water is divided into two strands for discharge, and only one strand of hot water needs to be introduced into the cooling tower for cooling, reducing the workload of the cooling tower, and thus reducing the energy consumption required for hot water cooling. Since the cooling design temperature of the cooling tower is generally about 10°C, its cooling effect is much greater than the temperature difference requirement between the inlet and outlet water of the blast furnace. The cold water discharged from the cooling tower has a lower temperature. Introducing it into the cold water tank to mix with the other strand of hot water can appropriately increase the temperature of the cold water and ensure that it is still within the range of the blast furnace inlet water temperature, meeting the cooling needs of the blast furnace. By this means, under the premise of meeting the blast furnace cooling, the energy consumption can be reduced, the production cost can be lowered. At the same time, one of the two strands of hot water needs to consume energy to be pumped to the cooling tower, while the other strand of hot water can rely on its own gravity when flowing into the cold water tank without consuming additional energy. Compared with the current situation where all hot water needs to consume energy for pumping, the energy consumption can be significantly reduced, playing an energy-saving role. Secondly, several cooling components are arranged in parallel on the blast furnace in this system, and each cooling component cools a corresponding area of the blast furnace. Compared with the traditional series constant flow water supply cooling method, it can more effectively meet the local cooling requirements of each part of the blast furnace, and the cooling effect is better. In addition, this system is provided with two temperature adjustment mechanisms. One is that when the blast furnace is operating normally, according to the change of its heat load, the flow rates of the two strands of hot water can be adjusted, and finally the ratio of cold water and hot water entering the cold water tank can be adjusted, ultimately achieving appropriate adjustment of the water supply temperature of the blast furnace to meet the cooling effect requirements. The other is that when the blast furnace malfunctions and the cooling is not timely or the cooling effect does not meet the standard through the above method, the cold water discharged from the cooling tower can be directly introduced into the cooling components on the areas and parts of the blast furnace that urgently need cooling. According to the cooling effect requirements, direct cooling with cold water or cooling with the mixed water of cold water and the cooling water discharged from the cold water tank can be adopted, and the water flow rate can be appropriately increased to quickly take away the heat of the high heat load and prevent damage to the cooling equipment. Through this system, according to the real-time change of the blast furnace heat load, the blast furnace can be accurately cooled in a timely and effective manner for each part, the water temperature can be adjusted conveniently and quickly, and the cooling effect of the cooling water can be adjusted in a timely manner to ensure the safety of the blast furnace operation. To sum up, the utility model has the advantages of reducing energy consumption, being able to timely adjust the cooling capacity of each part of the blast furnace, and being safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the overall structural schematic diagram of the present utility model;

[0013] Figure 2 is the structural schematic diagram of the thermostat 9 in the present utility model;

[0014] In the figure: 1 - blast furnace, 2 - water tank, 3 - cooling tower, 4 - hot water tank, 5 - cold water tank, 6 - downcomer, 7 - cold water branch pipe, 8 - cold water main pipe, 9 - thermostat, 10 - water distribution pipe, 11 - spray holes, 12 - cold water pipe, 13 - exhaust port, 14 - agitator, 15 - filter, 16 - make-up water pipe. Specific embodiments

[0015] The present utility model will be further described below in conjunction with the accompanying drawings, but it is not limited to the present utility model in any way. Any changes or improvements made based on the present utility model fall within the protection scope of the present utility model.

[0016] As Figures 1 - 2 shown, the present utility model includes a blast furnace 1, a water tank 2 and a cooling tower 3. The blast furnace 1 and the cooling tower 3 are both existing devices. The cooling tower 3 is used to cool hot water. The interior of the water tank 2 is divided into a hot water tank 4 above and a cold water tank 5 below by a partition. A downcomer 6 communicating the hot water tank 4 and the cold water tank 5 is provided on the partition. A downcomer flow valve is provided on the downcomer 6. The water outlet of the hot water tank 4 is communicated with the water inlet of the cooling tower 3. The water inlet of the cold water tank 5 is communicated with the water outlet of the cooling tower 3. The blast furnace 1 is successively provided with a plurality of cooling components in sections from bottom to top. The water outlets of the respective cooling components are communicated with the hot water tank 4. Cold water branch pipes 7 are provided at the water inlets of the respective cooling components. The end of each cold water branch pipe 7 is provided with a cold water main pipe 8. The cold water main pipe 8 is communicated with the cold water tank 5. A thermostat 9 is provided on each cold water branch pipe 7. The thermostat 9 is an existing device and can mix two kinds of water with different temperatures to achieve the purpose of adjusting the water temperature. The cold water inlet of the thermostat 9 is communicated with the water outlet of the cooling tower 3.

[0017] When the utility model is in operation, the cooling water is divided into multiple strands, and each strand of cooling water enters a corresponding cooling component on the blast furnace 1. After absorbing heat, it becomes hot water, which is all introduced into the hot water tank 4, and then divided into two strands. One strand is introduced into the cooling tower 3, and the temperature is reduced in the cooling tower 3 to obtain cold water with a lower temperature. Then the cold water is introduced into the cold water tank 5. The other strand flows into the cold water tank 5 from the downcomer 6 arranged on the bottom partition of the hot water tank 4. In this way, the cold water and the hot water are fully mixed in the cold water tank 5, so that the water temperature of the mixed water is slightly lower than the normal water supply temperature required by the production process of the blast furnace 1. Then it is divided into multiple strands and introduced into the corresponding cooling components on the blast furnace 1, forming a complete water resource utilization cycle, saving water resources while reducing the discharge of hot water and avoiding environmental pollution.In the above process, the hot water is divided into two streams for discharge, and only one stream of hot water needs to be fed into the cooling tower 3 for cooling, reducing the workload of the cooling tower 3 and thus reducing the energy consumption required for hot water cooling. Since the designed cooling temperature of the cooling tower 3 is generally around 10°C, its cooling effect is far greater than the temperature difference requirement for the inlet and outlet water of the blast furnace 1. The cold water discharged from the cooling tower 3 has a relatively low temperature. Feeding it into the cold water tank 5 and mixing it with the other stream of hot water can appropriately increase the temperature of the cold water and ensure that it is still within the range of the inlet water temperature of the blast furnace 1, meeting the cooling needs of the blast furnace 1. In this way, under the premise of meeting the cooling of the blast furnace 1, energy consumption can be reduced, production costs can be lowered. At the same time, one of the two streams of hot water needs to consume energy to be pumped to the cooling tower 3, while when the other stream of hot water enters the cold water tank 5, it can rely on its own gravity without consuming additional energy. Compared with the current situation where all hot water needs to consume energy for pumping, the energy consumption can be significantly reduced, playing an energy-saving role. Secondly, several cooling components are arranged in parallel on the blast furnace 1 in this system. Each cooling component cools a corresponding area of the blast furnace 1. Compared with the traditional series constant-flow water supply cooling method, it can more effectively meet the local cooling requirements of various parts of the blast furnace 1, and the cooling effect is better. In addition, this system is provided with two temperature adjustment mechanisms. One is that when the blast furnace 1 is operating normally, according to the change of its heat load, the flow rates of the two streams of hot water can be adjusted, and finally the ratio of cold water and hot water entering the cold water tank 5 can be adjusted, ultimately achieving appropriate adjustment of the water supply water temperature of the blast furnace 1 to meet the cooling effect requirements. This temperature adjustment method is the common mode, used to continuously provide cooling water with appropriate temperature, with a relatively large amount of water adjustment and a relatively slow adjustment speed. The other is that when the blast furnace 1 malfunctions and the cooling is not timely and the cooling effect does not meet the standard through the above method, the cold water discharged from the cooling tower 3 can be directly fed into the cooling components on the areas and parts of the blast furnace 1 that urgently need cooling. According to the cooling effect requirements, direct cooling with cold water or cooling with a mixed water of cold water and the cooling water discharged from the cold water tank 5 can be adopted, and the water flow rate can be appropriately increased to quickly remove the heat of the high heat load and prevent damage to the cooling equipment. This temperature adjustment method is the emergency mode, used to quickly provide appropriate cooling water. Through this system, according to the real-time change of the heat load of the blast furnace 1, the various parts of the blast furnace 1 can be accurately cooled in a timely and effective manner, the water temperature can be adjusted conveniently and quickly, and the cooling effect of the cooling water can be adjusted in a timely manner to ensure the safe operation of the blast furnace 1.

[0018] The thermostat 9 includes a sealed housing and a water distribution pipe 10 concentrically arranged inside the housing. One end of the housing is connected to the water inlet of the cooling component on the blast furnace 1, and the other end is connected to the water outlet of the cold water tank 5. Both ends of the water distribution pipe 10 are blocked, and a number of spray holes 11 are evenly machined on the water distribution pipe 10. A cold water pipe 12 connected to the water outlet of the cooling tower 3 is provided on the housing. After the end of the cold water pipe 12 extends into the housing, it is connected to the water distribution pipe 10. During operation, the relatively cold water discharged from the cooling tower 3 is introduced into the water distribution pipe 10 through the cold water pipe 12 and then sprayed out from each spray hole 11. At the same time, the cooling water discharged from the cold water tank 5 is introduced into one end of the housing and then flows into the annular space between the water distribution pipe 10 and the housing, mixing with the cold water sprayed out from the spray holes 11, which can quickly and further reduce the temperature of the cooling water in real time to meet the cooling requirements of the blast furnace 1. When necessary, cold water can also be directly introduced into the cooling component of the blast furnace 1 to provide a cooling effect.

[0019] Exhaust ports 13 are provided at the tops of both the hot water tank 4 and the cold water tank 5. The cooling water enters each cooling component of the blast furnace 1 to cool the blast furnace 1, and its temperature rises by absorbing the heat of the blast furnace 1. During this process, a certain amount of water vapor will be generated. These water vapors flow in the system together with the water flow. On the one hand, it will affect the cooling effect of the hot water in the cooling tower 3, and on the other hand, it will also affect the cooling effect of the cooling water on the blast furnace 1, which is not conducive to the efficient and stable operation of the circulating cooling water system. Therefore, exhaust ports 13 are provided in the hot water tank 4 and the cold water tank 5, and the water vapor can be discharged from the exhaust ports 13.

[0020] A stirrer 14 is provided inside the cold water tank 5. The stirrer 14 is an existing device. During operation, the blades of the stirrer 14 stir the hot water and cold water during rotation, making the water flow in the cold water tank 5 in a flowing state, thereby promoting the mixing of the hot water and cold water, accelerating the cooling rate of the hot water, and improving the mixing efficiency.

[0021] A filter 15 is provided on the cold water main pipe 8. The filter 15 is an existing device and is used to filter impurities such as scale and residues in the circulating water, preventing the accumulation of impurities such as scale and residues from causing blockage of the system. At the same time, the presence of impurities such as scale and residues will also reduce the heat absorption efficiency of the cooling water for the blast furnace 1. Removing them can improve the cooling effect of the cooling component on the blast furnace 1.

[0022] A makeup water pipe 16 is connected to the cold water tank 5. During the continuous operation of the circulating cooling water system, it is inevitable to cause a certain loss of water. When the loss of water reaches a certain level, it may lead to the inability to meet the cooling requirements for the operation of the blast furnace. At this time, new cooling water can be replenished into the system through the makeup water pipe 16, and the water replenished into the system generally has a relatively low temperature. Introducing it into the cold water tank 5 can accelerate the cooling rate of the hot water. At the same time, when replenishing new cooling water, the use of the cooling tower 3 can be suspended to reduce energy consumption.

Claims

1. An energy-saving blast furnace circulating cooling water system, comprising a blast furnace (1), a water tank (2) and a cooling tower (3), characterized in that : The interior of the water tank (2) is divided by a partition into a hot water tank (4) above and a cold water tank (5) below. A downcomer (6) connecting the hot water tank (4) and the cold water tank (5) is provided on the partition, and a downflow valve is provided on the downcomer (6). The water outlet of the hot water tank (4) is communicated with the water inlet of the cooling tower (3), and the water inlet of the cold water tank (5) is communicated with the water outlet of the cooling tower (3). The blast furnace (1) is successively provided with a number of cooling components in sections from bottom to top. The water outlets of each cooling component are communicated with the hot water tank (4), and a cold water branch pipe (7) is provided at the water inlet of each cooling component. A cold water main pipe (8) is provided at the end of the cold water branch pipe (7), and the cold water main pipe (8) is communicated with the cold water tank (5). A temperature regulator (9) is provided on each cold water branch pipe (7), and the cold water inlet of the temperature regulator (9) is communicated with the water outlet of the cooling tower (3).

2. The energy-saving blast furnace circulating cooling water system according to claim 1, wherein : The temperature regulator (9) includes a sealed housing and a water distribution pipe (10) concentrically arranged in the housing. One end of the housing is communicated with the water inlet of the cooling component on the blast furnace (1), and the other end is communicated with the water outlet of the cold water tank (5). Both ends of the water distribution pipe (10) are blocked, and a number of spray holes (11) are uniformly machined on the water distribution pipe (10). A cold water pipe (12) communicated with the water outlet of the cooling tower (3) is provided on the housing, and the end of the cold water pipe (12) extends into the housing and is communicated with the water distribution pipe (10).

3. The energy-saving blast furnace circulating cooling water system according to claim 1, characterized in that : Exhaust ports (13) are provided at the tops of both the hot water tank (4) and the cold water tank (5).

4. The energy-saving blast furnace circulating cooling water system according to claim 1, characterized in that : A stirrer (14) is provided in the cold water tank (5).

5. The energy-saving blast furnace circulating cooling water system according to claim 1, characterized in that : A filter (15) is provided on the cold water main pipe (8).

6. The energy-saving blast furnace circulating cooling water system according to claim 1, wherein : A make-up water pipe (16) is connected to the cold water tank (5).

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