Security emergency treatment method for cooling water of combustion fan of blast furnace

Abstract

The invention discloses a blast furnace combustion fan cooling water security emergency treatment method, which is characterized in that a circulating cooling water inlet pipe is connected with a standby water inlet pipe, the standby water inlet pipe is connected with an industrial water cooling system, the standby water inlet pipe is provided with a first water inlet valve, and the circulating cooling water outlet pipe is connected with a standby water outlet pipe; a first water outlet valve is arranged on the standby water outlet pipe, the water outlet end of the standby water outlet pipe is connected to the drainage ditch, and the first water inlet valve and the first water outlet valve are opened when a running stopping signal of the circulating cooling water system is received. Before the underground circulating cooling water system stops running, the first water inlet valve and the first water outlet valve can be controlled to be opened, cooling of the industrial water system is switched firstly, it is guaranteed that a bearing is cooled continuously, the accident rate is reduced, and normal production of a blast furnace is stabilized.

Description

Technical Field

[0001] The invention relates to the technical field of cooling the combustion-supporting fan of a hot blast furnace in a steel plant, in particular to a method for emergency treatment of cooling water security of a combustion-supporting fan of a blast furnace. Background Art

[0002] The combustion-supporting fan of a steel plant's hot blast furnace is a crucial piece of equipment for improving blast furnace efficiency. Typically, the damper opening is adjusted by controlling the motor actuator to meet the combustion air demand. Regardless of production demand, the fan's bearing seat operates at almost full speed, remaining operational until the blast furnace is shut down for maintenance. The bearings are cooled by cooling water. Friction from the bearings generates high temperatures, which are then transferred to the bearing seats. Circulating water is then used to cool the bearings' upper and lower covers, keeping them below 70°C. Therefore, cooling water is essential to maintain proper operation. Excessive temperatures can cause the combustion-supporting fan to trip and trip. In severe cases, the bearings can deform due to the elevated temperature, rendering the fan inoperable.

[0003] However, the bearing cooling system utilizes a circulating water cooling system, with the main inlet and outlet pipes pre-buried underground. Over time, the pre-buried pipes corrode severely, leading to cracking and leaks. Furthermore, the underground water pipe valves rust and fail to open and close properly, necessitating maintenance and replacement. In both cases, the pump must be stopped, preventing the bearings from cooling properly. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for emergency treatment of cooling water security for blast furnace combustion-supporting fans, so as to solve the problem that when the circulating water pipeline pre-buried underground needs to be stopped for maintenance or abnormal accidents, the pump needs to be stopped for maintenance, and the post-stop treatment is difficult and time-consuming, resulting in a long-term lack of cooling water for the bearings.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a method for emergency treatment of cooling water security for a blast furnace combustion-supporting fan, wherein a circulating cooling water inlet pipe is connected to a spare water inlet pipe, the spare water inlet pipe is connected to an industrial water cooling system, a first water inlet valve is provided on the spare water inlet pipe, a circulating cooling water outlet pipe is connected to a spare water outlet pipe, a first water outlet valve is provided on the spare water outlet pipe, the outlet end of the spare water outlet pipe is connected to a drain ditch, and upon receiving a signal to stop the circulating cooling water system, the first water inlet valve and the first water outlet valve are opened.

[0006] As a further improvement of the present invention: the circulating cooling water inlet pipe is connected to a water inlet detection branch near the bearing seat, and a first bypass valve is installed on the water inlet detection branch; the circulating cooling water outlet pipe is connected to a water outlet detection branch, and a second bypass valve is installed on the water outlet detection branch; After opening the first water inlet valve and the first water outlet valve, the first bypass valve and the second bypass valve are opened at set intervals to detect the inlet pressure, flow rate and temperature of the industrial water, and the outlet pressure, flow rate and temperature of the industrial water, respectively, to evaluate the cooling capacity of the industrial water cooling system.

[0007] As a further improvement of the present invention: if the inlet and outlet water temperature difference is within a preset temperature difference range, it is determined that the cooling capacity of the industrial water cooling system is normal; If the inlet and outlet water temperature difference is not within the preset temperature difference range, it is determined that the cooling capacity of the industrial water cooling system is abnormal. When the inlet and outlet water temperature difference is higher than the upper limit of the preset temperature difference range, the water pump operating parameters and the first water inlet valve of the industrial cooling water system are adjusted to increase the water inlet pressure and water inlet flow.

[0008] As a further improvement of the present invention: a second water inlet valve is installed at the connection between the outlet main pipe of the circulating cooling water system and the circulating cooling water inlet pipe, and a second water outlet valve is installed at the connection between the outlet main pipe of the circulating cooling water system and the circulating cooling water outlet pipe; when the first water inlet valve and the first water outlet valve are opened, the second water inlet valve and the second water outlet valve are closed.

[0009] As a further improvement of the present invention: when the circulating cooling water system is in operation, the first water inlet valve and the first water outlet valve remain closed, the first bypass valve and the second bypass valve are opened, and the inlet water temperature and the outlet water temperature of the circulating cooling water system are detected; Obtain the current operating condition data of the combustion-supporting fan and determine the inlet and outlet water temperature difference threshold of the circulating cooling water system under the current operating conditions; If the difference between the inlet and outlet water temperatures does not meet the threshold, the cooling performance of the circulating cooling water system is determined to be abnormal, and a fault maintenance message is sent and a prompt to switch to the industrial water cooling system is issued; If the difference between the inlet water temperature and the outlet water temperature meets the inlet and outlet water temperature difference threshold, it is determined that the cooling performance of the circulating cooling water system is normal, and a periodic detection is performed at set intervals.

[0010] As a further improvement of the present invention: upon receiving a restart signal of the circulating cooling water system, the first water inlet valve is closed, the second water outlet valve of the circulating cooling water system remains closed, the second water inlet valve of the circulating cooling water system is opened, the first water outlet valve remains open, and after a set time interval, the first water outlet valve is closed and the second water outlet valve is opened.

[0011] As a further improvement of the present invention: further comprising: When the circulating cooling water system is running and leak detection is performed, record the current working conditions of the water pump and valves, fully open the first bypass valve, and detect the current diversion flow and real-time current of the water pump; Obtain the standard current and diversion flow of the water pump when the first bypass valve is fully open and the main pipeline of the circulating cooling water system is leak-free and the water pump and valve are under the same working conditions; If the real-time current of the water pump is greater than the standard current of the water pump, and the current diversion flow rate is approximately equal to the standard diversion flow rate, it is determined that there is no leakage in the main pipeline; If the real-time current of the water pump is greater than the standard current of the water pump and the current diversion flow is less than the standard diversion flow, it is determined that the main pipeline is cracked and leaking.

[0012] As a further improvement of the present invention: when the circulating cooling water system is running, the first water inlet valve and the first water outlet valve are closed, the first bypass valve is opened, and the current conductivity of the circulating cooling water is detected. If the current conductivity is higher than the conductivity threshold, it is determined that the main pipeline of the circulating cooling water system is leaking, and a fault repair message is sent. If the current conductivity is not higher than the conductivity threshold, it is determined that the main pipeline of the circulating cooling water system is not leaking, and cyclic detection is performed at set intervals.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention connects a spare water inlet pipe to the circulating cooling water inlet pipe for bearing cooling, and connects a spare water outlet pipe to the circulating cooling water outlet pipe. By controlling the first water inlet valve and the first water outlet valve, the spare industrial water system is promptly switched to cool the bearings before the original circulating cooling water system stops running. The spare cooling water is directly discharged to the drainage ditch, ensuring uninterrupted cooling of the bearings, improving the safe operation of the combustion-supporting fan cooling water, and stabilizing the normal production of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Reference numerals: 1. First water inlet valve, 2. First water outlet valve, 3. Second water inlet valve, 4. Second water outlet valve, 5. First bypass valve, 6. Second bypass valve. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] In order to solve the technical problems in the prior art, the present invention is further described with reference to the accompanying drawings and embodiments: like Figure 1As shown, the present invention discloses a method for emergency treatment of cooling water security for a blast furnace combustion-supporting fan. The circulating cooling water inlet pipe is connected to a spare water inlet pipe, and the spare water inlet pipe is provided with a first water inlet valve 1. The circulating cooling water outlet pipe is connected to a spare water outlet pipe, and the spare water outlet pipe is provided with a first water outlet valve 2. The outlet end of the spare water outlet pipe is connected to a drain ditch. When a signal to stop the circulating cooling water system is received, the first water inlet valve 1 and the first water outlet valve 2 are opened.

[0018] Among them, the original circulating cooling water system is connected with an outlet main pipe and an inlet main pipe, the outlet main pipe is connected to the circulating cooling water inlet pipe, a second inlet valve 3 is installed at the connection between the outlet main pipe and the circulating cooling water inlet pipe, the inlet main pipe is connected to the circulating cooling water outlet pipe, and a second outlet valve 4 is installed at the connection between the outlet main pipe and the circulating cooling water outlet pipe. The circulating cooling water inlet pipe and the circulating cooling water outlet pipe are respectively connected to the cooling pipes at the bearing seat to form a loop, which is used for the cooling water to circulate through the bearing seat to complete cooling.

[0019] Connect the spare water inlet pipe to the industrial water cooling system. Before the original circulating cooling water system stops running, control the first water inlet valve 1 and the first water outlet valve 2 to promptly switch to the spare industrial water system to cool the bearings. The spare cooling water is directly discharged to the drain to ensure uninterrupted cooling of the bearings, improve the safe operation of the combustion-supporting fan cooling water, and stabilize the normal production of the blast furnace.

[0020] When the first water inlet valve 1 and the first water outlet valve 2 are opened, the second water inlet valve 3 and the second water outlet valve 4 are closed.

[0021] When the circulating water pipeline pre-buried underground needs to be inspected or repaired, or an abnormal accident occurs, the pump needs to be stopped for maintenance, and the post-processing of the pump is difficult and time-consuming, resulting in the bearings being without cooling water for a long time. The present invention adds a spare water inlet pipe, a spare water outlet pipe, a first water inlet valve 1, and a first water outlet valve 2 to form a spare circulation pipeline with the original circulating cooling water inlet pipe and the cooling circulating water outlet pipe. Before the underground circulating cooling water system stops running, it can be switched to an industrial water cooling system to ensure uninterrupted cooling of the bearings. The industrial water cooling system can be used as a backup water source, and the fan bearings can be quickly cooled, reducing the accident rate and avoiding large economic losses. The present invention has a simple structure, is easy to operate, and has low costs.

[0022] In some embodiments, the circulating cooling water inlet pipe is connected to a water inlet detection branch near the bearing seat, and a first bypass valve 5 is installed on the water inlet detection branch. The circulating cooling water outlet pipe is connected to a water outlet detection branch, and a second bypass valve 6 is installed on the water outlet detection branch.

[0023] After the original underground circulating water cooling system stops running, the industrial water cooling system serves as a backup water source to cool the fan bearings. The first bypass valve 5 can be opened to discharge the industrial cooling water in the circulating cooling water inlet pipe through the water inlet detection branch, and the second bypass valve 6 can be opened to discharge the industrial cooling water in the circulating cooling water outlet pipe through the water outlet detection branch to detect the water source condition.

[0024] Specifically, after opening the first water inlet valve 1 and the first water outlet valve 2, the first bypass valve 5 and the second bypass valve 6 are opened at set intervals to detect the inlet pressure, inlet flow rate and inlet temperature of the industrial water, and detect the outlet pressure, outlet flow rate and outlet temperature, respectively, to evaluate the cooling capacity of the industrial water cooling system.

[0025] Inlet and outlet water temperature difference: During the cooling process, industrial water absorbs heat, causing the outlet water temperature to rise. The inlet and outlet water temperature difference directly reflects the amount of heat absorbed by the industrial water. A large difference indicates that the industrial water removes a lot of heat and has a strong cooling capacity; a small difference indicates that the heat removed is small and the cooling capacity may be insufficient.

[0026] Inlet and outlet water flow difference: Under normal circumstances, the inlet and outlet water flow should remain relatively stable with a small difference when the cooling system is operating normally. A large difference in inlet and outlet water flow may indicate a leak, a pipe blockage, or a water pump failure. Leaks reduce the amount of water actually involved in cooling, reducing cooling effectiveness; pipe blockages impede water flow, affecting heat exchange efficiency; and a water pump failure may prevent it from providing sufficient power to maintain normal flow.

[0027] If the inlet pressure is below the normal range, the cooling water flow rate will slow down and reduce the flow rate, affecting the cooling effect. This may be caused by water pump failure, pipe leakage, or improper valve opening. If the inlet pressure is above the normal range, it may cause additional pressure on the pipes and equipment, increasing safety risks. This may be caused by closed valves, excessive pump output pressure, or pipe blockage. Abnormal changes in outlet pressure can also reflect changes in internal system resistance, leakage, and other problems.

[0028] In some embodiments, if the inlet and outlet water temperature difference is within a preset temperature difference range, the cooling capacity of the industrial water cooling system is determined to be normal; if the inlet and outlet water temperature difference is not within the preset temperature difference range, the cooling capacity of the industrial water cooling system is determined to be abnormal. When the inlet and outlet water temperature difference is higher than the upper limit of the preset temperature difference range, the water pump operating parameters and the first water inlet valve 1 of the industrial cooling water system are adjusted to increase the water inlet pressure and water inlet flow.

[0029] If the current inlet and outlet water temperature difference is lower than the lower limit of the normal range, it may mean that the cooling water volume is too large, the cooling equipment is not producing enough heat, or the cooling system is not dissipating heat efficiently. If it is higher than the upper limit of the normal range, it indicates that the cooling capacity is insufficient, which may be due to insufficient cooling water volume, excessive heat production of the cooling equipment, or decreased heat exchange efficiency of the cooling system.

[0030] In some embodiments, when the circulating cooling water system is in operation, the first water inlet valve 1 and the first water outlet valve 2 remain closed, the first bypass valve 5 and the second bypass valve 6 are opened, and the inlet water temperature and the outlet water temperature of the circulating cooling water system are detected; Obtain the current operating condition data of the combustion-supporting fan and determine the inlet and outlet water temperature difference threshold of the circulating cooling water system under the current operating conditions; If the difference between the inlet and outlet water temperatures does not meet the threshold, the cooling performance of the circulating cooling water system is determined to be abnormal, and a fault maintenance message is sent and a prompt to switch to the industrial water cooling system is issued; If the difference between the inlet water temperature and the outlet water temperature meets the inlet and outlet water temperature difference threshold, it is determined that the cooling performance of the circulating cooling water system is normal, and a periodic detection is performed at set intervals.

[0031] In some embodiments, when a restart signal of the circulating cooling water system is received, the first water inlet valve 1 is closed, the second water outlet valve 4 of the circulating cooling water system remains closed, the second water inlet valve 3 of the circulating cooling water system is opened, and the first water outlet valve 2 remains open. After a set time interval, the first water outlet valve 2 is closed and the second water outlet valve 4 is opened.

[0032] After opening the first bypass valve 5, the water pressure in the water inlet detection branch is tested. If the underground water inlet main pipe cracks and leaks, the pressure in the main pipe will drop. This pressure change will be transmitted to the circulating cooling water inlet pipe, thereby affecting the water pressure in the water inlet detection branch. If the water pressure in the water inlet detection branch is detected to be lower than the normal range, it can be suspected that there is a leak in the underground water inlet main pipe.

[0033] After opening the second bypass valve 6, the water pressure in the water outlet detection branch is tested. If the underground water outlet main pipeline cracks and leaks, the pressure within the main pipeline will also change, causing the pressure of the circulating cooling water outlet pipe to change, which will be reflected in the water outlet detection branch. If the water pressure in the water outlet detection branch is abnormal, it can be inferred that there may be a leak in the underground water outlet main pipeline.

[0034] Similarly, an indirect inference can be made by observing the water flow in the water inlet detection branch. If the underground water inlet main pipe leaks, the total amount of water entering the main circulating water system will decrease. Then, when the first bypass valve 5 is opened, the water flow in the water inlet detection branch may become smaller than normal. By long-term monitoring of the water flow in the water inlet detection branch, a normal water flow pattern is established. When it is found that the water flow has become significantly smaller, it may be caused by a leak in the underground water inlet main pipe. For the water outlet detection branch, if the underground water outlet main pipe leaks, the total amount of water flowing out of the main circulating water system will decrease, and the water flow in the water outlet detection branch will also change accordingly. When an abnormal change in the water flow in the water outlet detection branch is detected, it can be inferred that there may be a leak in the underground water outlet main pipe.

[0035] In some embodiments, the present invention further comprises: When the circulating cooling water system is running, record the current working conditions of the water pump and valves during leakage detection, fully open the first bypass valve 5, and detect the current diversion flow and real-time current of the water pump; Obtain the standard current and diversion flow of the water pump when the first bypass valve 5 is fully open and the main pipeline of the circulating cooling water system is leak-free and the water pump and valves are under the same working conditions; If the real-time current of the water pump is greater than the standard current of the water pump, and the current diversion flow rate is approximately equal to the standard diversion flow rate, it is determined that there is no leakage in the main pipeline; If the real-time current of the water pump is greater than the standard current of the water pump and the current diversion flow is less than the standard diversion flow, it is determined that the main pipeline is cracked and leaking.

[0036] In some embodiments, when the circulating cooling water system is in operation, the first water inlet valve 1 and the first water outlet valve 2 are closed, the first bypass valve 5 is opened, and the current conductivity of the circulating cooling water is detected. If the current conductivity is higher than the conductivity threshold, it is determined that the main pipeline of the circulating cooling water system is leaking, and a fault repair message is sent. If the current conductivity is not higher than the conductivity threshold, it is determined that the main pipeline of the circulating cooling water system is not leaking, and cyclic detection is performed at set intervals. Example

[0037] Connect a backup water pipe to each of the bearing cooling inlet and outlet pipes, and install a control valve to promptly switch to the backup industrial water system for cooling. The backup cooling water is then discharged directly into the drain, ensuring uninterrupted cooling of the bearings. This improves the safe operation of the combustion-supporting fan cooling water and stabilizes normal blast furnace production.

[0038] Through the existing bearing circulation cooling water pipe, a set of backup industrial water cooling systems are connected. When the existing cooling water is abnormal, the backup industrial water system can be switched to cooling in time, thereby achieving the safety and emergency purpose of the combustion-supporting fan bearing cooling water.

[0039] Connect an industrial water cooling system pipe to each of the circulating cooling water system's cooling inlet and outlet pipes, and install additional control valves. Before shutting down the circulating cooling water system, open the industrial water cooling system's first inlet valve 1 and first outlet valve 2, and close the circulating cooling water system's second inlet valve 3 and second outlet valve 4 to ensure uninterrupted cooling of the bearings. Cooling water from the industrial water cooling system is discharged directly into the drain, while first bypass valves 5 and 6 are used to monitor the water source, thereby ensuring safe operation of the combustion-supporting fan cooling water and stabilizing normal blast furnace production.

[0040] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical solutions and technical concepts of the present invention without creative mental work, and all of them fall within the scope of protection of the present invention.

Claims

1. A method for emergency treatment of cooling water security of a blast furnace combustion-supporting fan, characterized in that: The circulating cooling water inlet pipe is connected to a spare water inlet pipe, which is connected to the industrial water cooling system. The spare water inlet pipe is provided with a first water inlet valve. The circulating cooling water outlet pipe is connected to a spare water outlet pipe, which is provided with a first water outlet valve. The outlet end of the spare water outlet pipe is connected to the drain ditch. When the circulating cooling water system stops operating signal is received, the first water inlet valve and the first water outlet valve are opened.

2. The method for emergency treatment of cooling water for a blast furnace combustion-supporting fan according to claim 1, characterized in that: The circulating cooling water inlet pipe is connected to a water inlet detection branch near the bearing seat, and a first bypass valve is installed on the water inlet detection branch. The circulating cooling water outlet pipe is connected to a water outlet detection branch, and a second bypass valve is installed on the water outlet detection branch. After opening the first water inlet valve and the first water outlet valve, the first bypass valve and the second bypass valve are opened at set intervals to detect the inlet pressure, flow rate and temperature of the industrial water, and the outlet pressure, flow rate and temperature of the industrial water, respectively, to evaluate the cooling capacity of the industrial water cooling system.

3. The method for emergency treatment of cooling water for a blast furnace combustion-supporting fan according to claim 2, characterized in that: If the inlet and outlet water temperature difference is within the preset temperature difference range, it is determined that the cooling capacity of the industrial water cooling system is normal; If the inlet and outlet water temperature difference is not within the preset temperature difference range, it is determined that the cooling capacity of the industrial water cooling system is abnormal. When the inlet and outlet water temperature difference is higher than the upper limit of the preset temperature difference range, the water pump operating parameters and the first water inlet valve of the industrial cooling water system are adjusted to increase the water inlet pressure and water inlet flow.

4. The method for emergency treatment of cooling water for a blast furnace combustion-supporting fan according to claim 2, characterized in that: A second water inlet valve is installed at the connection between the outlet main pipe of the circulating cooling water system and the circulating cooling water inlet pipe, and a second water outlet valve is installed at the connection between the outlet main pipe of the circulating cooling water system and the circulating cooling water outlet pipe; when the first water inlet valve and the first water outlet valve are opened, the second water inlet valve and the second water outlet valve are closed.

5. The method for emergency treatment of cooling water for a blast furnace combustion-supporting fan according to claim 4, characterized in that: When the circulating cooling water system is running, the first water inlet valve and the first water outlet valve remain closed, the first bypass valve and the second bypass valve are opened, and the inlet water temperature and the outlet water temperature of the circulating cooling water system are detected; Obtain the current operating condition data of the combustion-supporting fan and determine the inlet and outlet water temperature difference threshold of the circulating cooling water system under the current operating conditions; If the difference between the inlet and outlet water temperatures does not meet the threshold, the cooling performance of the circulating cooling water system is determined to be abnormal, and a fault maintenance message is sent and a prompt to switch to the industrial water cooling system is issued; If the difference between the inlet water temperature and the outlet water temperature meets the inlet and outlet water temperature difference threshold, it is determined that the cooling performance of the circulating cooling water system is normal, and a periodic detection is performed at set intervals.

6. A method for emergency treatment of cooling water for a blast furnace combustion-supporting fan according to claim 1 or 4, characterized in that: Upon receiving a restart signal of the circulating cooling water system, the first water inlet valve is closed, the second water outlet valve of the circulating cooling water system remains closed, the second water inlet valve of the circulating cooling water system is opened, the first water outlet valve remains open, and after a set time interval, the first water outlet valve is closed and the second water outlet valve is opened.

7. The method for emergency treatment of cooling water for a blast furnace combustion-supporting fan according to claim 5, characterized in that: Also includes: When the circulating cooling water system is running and leak detection is performed, record the current working conditions of the water pump and valves, fully open the first bypass valve, and detect the current diversion flow and real-time current of the water pump; Obtain the standard current and diversion flow of the water pump when the first bypass valve is fully open and the main pipeline of the circulating cooling water system is leak-free and the water pump and valve are under the same working conditions; If the real-time current of the water pump is greater than the standard current of the water pump, and the current diversion flow rate is approximately equal to the standard diversion flow rate, it is determined that there is no leakage in the main pipeline; If the real-time current of the water pump is greater than the standard current of the water pump and the current diversion flow is less than the standard diversion flow, it is determined that the main pipeline is cracked and leaking.

8. The method for emergency treatment of cooling water for a blast furnace combustion-supporting fan according to claim 5, characterized in that: When the circulating cooling water system is running, the first water inlet valve and the first water outlet valve are closed, the first bypass valve is opened, and the current conductivity of the circulating cooling water is detected. If the current conductivity is higher than the conductivity threshold, it is determined that the main pipeline of the circulating cooling water system is leaking, and a fault repair message is sent. If the current conductivity is not higher than the conductivity threshold, it is determined that the main pipeline of the circulating cooling water system is not leaking, and cyclic detection is performed at set intervals.

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