Transformation method for online replacement of tuyere small sleeve water inlet metal hose of blast furnace

Abstract

The invention relates to the technical field of metallurgical equipment, and discloses a transformation method for online replacement of a tuyere small sleeve water inlet metal hose of a blast furnace, which comprises the following steps: hardware transformation: mounting a water inlet and water outlet three-way ball valve with a bypass interface at a water inlet and a water outlet of a tuyere small sleeve of the blast furnace; bypass construction: connecting a standby water source and a water outlet to a bypass interface of the three-way ball valve by using a metal hose, and constructing a temporary open-circuit cooling bypass; flow path switching: operating the three-way ball valve to switch the cooling flow path from the main loop to the temporary bypass; online replacement is conducted, specifically, in the bypass cooling state, the water inlet metal hose is replaced online; after replacement is completed, the three-way ball valve is operated to restore the cooling flow path to the main loop; and bypass removal: removing the metal hose of the temporary bypass after determining that the main loop operates normally. By additionally arranging the three-way valve with mechanical interlocking, the cooling pipeline can be safely replaced without damping down of the blast furnace, production is guaranteed, and safety is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical equipment, in particular to a reforming method for replacing an inlet water metal hose of a tuyere small sleeve of a blast furnace online. BACKGROUND

[0002] In the steel smelting process, the blast furnace is the core production equipment. The blast furnace tuyere small sleeve is a key component directly facing the high-temperature area of the furnace, and its structural stability and operation safety are extremely dependent on a continuous and reliable circulating water cooling system. The inlet water metal hose connecting the main cooling circuit and the single tuyere small sleeve is an important part of the cooling system. However, due to the combined effects of long-term high-temperature radiation, high-pressure water flow scouring, and equipment vibration, such metal hoses will age, wear, and eventually leak, so they need to be replaced and maintained.

[0003] Currently, the common technical solution in the industry for replacing the inlet water metal hose of the blast furnace tuyere small sleeve is to perform planned shutdown replacement. The specific operation is as follows: first, the blast furnace is put on standby, so that it is out of the normal production state; after the furnace condition is stable, the entire cooling water system is shut down, depressurized and emptied; then, the maintenance personnel enter the site to physically disassemble and replace the faulty metal hose; after replacement, the cooling system is filled with water, pressurized, and finally the normal production of the blast furnace is restored after confirming that there is no leakage.

[0004] Although the existing technology can complete the replacement of the inlet water metal hose during the blast furnace standby period, there are still some deficiencies: the inherent logic of the existing replacement method determines that it must be based on interrupting the normal production of the blast furnace. This is because the traditional cooling system is a whole linkage system in design and does not have the ability to independently isolate the flow path of a single cooling element (such as a tuyere small sleeve) while maintaining the main operation. Therefore, the replacement of any pressure-bearing component in the system must first shut down and depressurize the entire system, which directly leads to the blast furnace having to be put on standby, resulting in significant economic losses proportional to the downtime. In addition, this offline processing mode also derives a serious safety hazard. When an initial leakage occurs in a metal hose, it will trigger a water loss alarm for the entire cooling system. In order to maintain production until the planned downtime, the operator often needs to shield this known leakage signal by adjusting the alarm threshold and other methods. Although this ensures short-term production, the cost is that the entire leakage monitoring system loses sensitivity to new and unknown leakage points. During this period, if a new leakage occurs at any other location in the system, the monitoring system will not be able to issue an alarm in time, thus forming a monitoring blind area that may evolve into a more serious equipment accident due to failure to detect in time. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a transformation method for online replacement of a tuyere small sleeve water inlet metal hose of a blast furnace, which solves the problem that in the prior art, a single tuyere small sleeve cooling pipeline must be replaced by stopping production through blast furnace shutdown.

[0006] To achieve the above object, the present application is implemented by the following technical solutions: a transformation method for online replacement of a tuyere small sleeve water inlet metal hose of a blast furnace, which comprises hardware system transformation and online maintenance operation based on the transformation.

[0007] Hardware system transformation:

[0008] The cooling water pipeline of the tuyere small sleeve of the blast furnace is transformed, specifically:

[0009] A water inlet tee ball valve is installed before the water inlet of each tuyere small sleeve of the blast furnace, and a water outlet tee ball valve is installed after the water outlet thereof. The water inlet tee ball valve and the water outlet tee ball valve are both provided with a first port, a second port and a common port. The first port is used for connection with the main cooling loop pipeline, the second port is provided as a bypass interface for connection with an external pipeline, and the common port is connected with the water inlet and outlet of the tuyere small sleeve of the blast furnace.

[0010] An industrial standard quick connector is installed at the bypass interface to ensure quickness and universality in connection with the external pipeline or equipment unit.

[0011] A mechanical safety interlocking mechanism is provided between the water inlet tee ball valve and the water outlet tee ball valve. The mechanical safety interlocking mechanism associates the operations of the two valves through a mechanical structure, and is used for physically forcing the operator to follow a preset safety timing for switching, so as to prevent the pipeline from being pressurized or instantaneously interrupted due to incorrect operation sequence.

[0012] Online maintenance operation:

[0013] Based on the above hardware system transformation, the present method can perform online maintenance operations including but not limited to the following:

[0014] Core application: online replacement operation:

[0015] When the water inlet metal hose of the tuyere small sleeve of the blast furnace needs to be replaced online, the following steps are performed:

[0016] Constructing temporary cooling bypass: connecting the standby industrial water source through its control valve to the bypass interface of the water inlet three-way ball valve by a metal hose as a temporary water inlet source; and connecting the bypass interface of the water outlet three-way ball valve to the water tank by another metal hose as an open-drain water discharge path, thus forming a complete industrial water open-drain cooling bypass. The reason for choosing the standby industrial water is that its water temperature is lower than that of the high-temperature soft water in the main cooling loop, which can reduce the risk of burns to the operating personnel in subsequent operations.

[0017] Switching flow path to bypass: operating the water inlet three-way ball valve and the water outlet three-way ball valve to seamlessly switch the cooling flow path of the blast furnace tuyere small sleeve from the main cooling loop to the constructed industrial water open-drain cooling bypass. This switching process is forced by the mechanical safety interlocking mechanism to enforce the following timing:

[0018] First, operate the water outlet three-way ball valve to switch the flow path from the main cooling loop to the open-drain water discharge path, and then allow the water inlet three-way ball valve to switch the flow path from the main cooling loop to the path supplied by the standby industrial water. After switching is complete, the blast furnace tuyere small sleeve is independently and continuously cooled by the standby industrial water.

[0019] Regulation and replacement: regulating the control valve of the standby industrial water source to adjust the amount of water entering the industrial water open-drain cooling bypass, and removing the old water inlet metal hose and installing a new water inlet metal hose while ensuring sufficient cooling of the blast furnace tuyere small sleeve.

[0020] Restoring flow path to main loop: after replacement is complete, operate the water inlet three-way ball valve and the water outlet three-way ball valve again to restore the cooling flow path from the industrial water open-drain cooling bypass to the soft water inlet end of the main cooling loop. This restoration process is forced by the mechanical safety interlocking mechanism to enforce the following timing: first, operate the water inlet three-way ball valve to restore the flow path from the industrial water open-drain cooling bypass to the main cooling loop, and then allow the water outlet three-way ball valve to restore the flow path from the industrial water open-drain cooling bypass to the main cooling loop.

[0021] End operation: after the monitoring system confirms that the main cooling loop flow has returned to normal, close the control valve of the standby industrial water source and remove the metal hoses used to construct the industrial water open-drain cooling bypass.

[0022] Online diagnostic operation:

[0023] With the hardware system modification, the method can also perform online diagnostic operation, the steps of which are:

[0024] First, perform the steps of constructing a temporary cooling bypass and switching a flow path to a bypass to safely switch the target blast furnace tuyere small sleeve to a state of being independently cooled by the industrial water open-drain cooling bypass.

[0025] Perform internal leakage detection: connect a pressure gauge to the industrial water open cooling bypass, temporarily close the outlet end of the bypass, and monitor the change of internal pressure P(t) with time t. Calculate the pressure decay rate according to the following formula: if the calculated pressure decay rate is less than the preset leakage judgment threshold θleak, then determine that the blast furnace tuyere small sleeve has internal leakage.

[0026]

[0027] where ΔP is the pressure change; Δt is the monitoring time interval; P(t1) is the pressure at the end time; P(t0) is the pressure at the start time; t1-t0 is the monitoring time interval, t1 is the monitoring end time; t0 is the monitoring start time; θleak is the preset leakage judgment threshold. leak

[0028] After diagnosis is completed, the above-mentioned recovery of flow path to main circuit and end operation is performed to restore the system to normal operating state, and the diagnosis result is recorded.

[0029] Online chemical cleaning operation:

[0030] The method can also perform an online chemical cleaning operation, the steps of which are:

[0031] The inlet and outlet pipelines of the mobile chemical cleaning unit are connected to the bypass interfaces of the water inlet and outlet three-way ball valves of the target blast furnace tuyere small sleeve through quick couplings, respectively.

[0032] The water inlet and outlet three-way ball valves are operated to switch the cooling flow path to the bypass. This operation will form an independent cleaning sub-circuit consisting of a chemical cleaning unit and a single blast furnace tuyere small sleeve, which is completely isolated from the main cooling circuit.

[0033] The chemical cleaning unit is started to circulate the cleaning agent in the sub-circuit, and the single blast furnace tuyere small sleeve is independently chemically descaled or treated.

[0034] After cleaning is completed, the chemical cleaning unit is disconnected, and standby industrial water is connected to the blast furnace tuyere small sleeve for sufficient flushing to remove the chemical agent residues.

[0035] After flushing is completed, the above-mentioned recovery of flow path to main circuit and end operation is performed to safely restore the system to normal operating state.

[0036] The present application provides a method for online replacement of the water inlet metal hose of the tuyere small sleeve of a blast furnace. The method has the following beneficial effects:

[0037] ​1. The application can build a temporary industrial water open cooling bypass by installing the water inlet three-way ball valve and the water outlet three-way ball valve in the tuyere small sleeve cooling water pipeline. This makes the main cooling circuit keep normal operation when replacing the water inlet metal hose, and the target tuyere small sleeve is continuously cooled by the independent bypass, so that the blast furnace does not need to be blown off and shut down, directly avoiding the huge economic loss caused thereby.

[0038] 2. The application sets a mechanical safety interlocking mechanism between the pair of three-way ball valves, which forces the operator to follow the safety timing of "out first and in second" or "in first and out second" through physical structure, fundamentally eliminating the risk of pipeline pressure or instantaneous flow interruption caused by misoperation. At the same time, the bypass cooling uses lower-temperature standby industrial water to replace the high-temperature soft water in the original pipeline, effectively avoiding the risk of scalding for the operating personnel during replacement.

[0039] 3. The standardized bypass interface provided by the application not only serves for replacement operation, but also provides a multifunctional maintenance platform. By using the interface, pressure gauges and other diagnostic tools can be conveniently connected for accurate online leakage detection without affecting production, or chemical cleaning units can be connected for independent performance recovery of individual cooling elements, so that the traditional passive fault handling is changed to prospective and preventive equipment health management. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a system structure schematic diagram according to an embodiment of the application. The application provides a system structure after the reform of the tuyere small sleeve cooling pipeline of the blast furnace, which adds a plurality of components on the basis of the existing blast furnace cooling system.

[0041] Figure 2 is a method flowchart according to an embodiment of the application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the application will be described clearly and completely in combination with the drawings in the specification of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0043] Please refer to the drawings in the specification of the application, Figure 1 , Figure 1 is a system structure schematic diagram according to an embodiment of the application. The application provides a system structure after the reform of the tuyere small sleeve cooling pipeline of the blast furnace, which adds a plurality of components on the basis of the existing blast furnace cooling system.

[0044] The system structure includes a blast furnace tuyere small sleeve 10, which is cooled by a main cooling circuit 20. The main cooling circuit 20 includes a main circuit water inlet pipe 21 and a main circuit water outlet pipe 22. A water inlet metal hose 30 is used to connect the main circuit water inlet pipe 21 and the water inlet of the blast furnace tuyere small sleeve 10.

[0045] The modified part of the present application specifically includes:

[0046] A water inlet three-way ball valve 40 is installed between the water inlet of the blast furnace tuyere small sleeve 10 and the water inlet metal hose 30.

[0047] A water outlet three-way ball valve 50 is installed between the water outlet of the blast furnace tuyere small sleeve 10 and the main circuit water outlet pipe 22.

[0048] The water inlet three-way ball valve 40 and the water outlet three-way ball valve 50 are both provided with bypass interfaces 41, 51 for connecting external temporary pipelines.

[0049] A mechanical safety interlocking mechanism 60 is physically connected to the water inlet three-way ball valve 40 and the water outlet three-way ball valve 50, and is used to physically constrain the operation sequence of the two valves.

[0050] The system also includes temporarily deployed components: a backup industrial water source 70, several sections of metal hoses 80, and a water tank 90 for draining water.

[0051] Please refer to the attached Figure 2 , Figure 2 is a flowchart of a method according to an embodiment of the present application. The present application provides a modification method for online replacement of the water inlet metal hose of the blast furnace tuyere small sleeve, which can include the following steps:

[0052] S1, hardware modification step;

[0053] S2, bypass construction step;

[0054] S3, flow path switching step;

[0055] S4, online replacement step;

[0056] S5, flow path recovery step;

[0057] S6, bypass removal step.

[0058] Please refer to the attached Figure 1 and the attached Figure 2 for a detailed description of the specific implementation of the method.

[0059] First, the S1 hardware modification step is performed. For each blast furnace tuyere small sleeve 10 that needs to be implemented online maintenance, a water inlet three-way ball valve 40, a water outlet three-way ball valve 50, and a mechanical safety interlocking mechanism 60 are installed to form a standardized modification structure.

[0060] When the water inlet metal hose 30 needs to be replaced, the bypass construction step S2 is performed. A piece of metal hose 80 is used to connect the standby industrial water source 70 to the bypass interface 41 of the water inlet tee ball valve 40; another piece of metal hose 80 is used to connect the bypass interface 51 of the water outlet tee ball valve 50 to the water tank 90. This operation constructs a temporary industrial water open cooling bypass.

[0061] Subsequently, the flow path switching step S3 is performed. The operation sequence of this step is enforced by the mechanical safety interlock mechanism 60. The operator first operates the water outlet tee ball valve 50 to switch the water outlet path from the main circuit water outlet pipe 22 to the bypass leading to the water tank 90. After this operation is completed, the mechanical safety interlock mechanism 60 releases the lock on the water inlet tee ball valve 40, and the operator then operates the water inlet tee ball valve 40 to switch the water inlet source from the main circuit water inlet pipe 21 to the standby industrial water source 70. After the switching is completed, the blast furnace tuyere small sleeve 10 is independently cooled by the temporary bypass.

[0062] In the bypass continuous cooling state, the online replacement step S4 is performed. The damaged water inlet metal hose 30 is disassembled by the operator, and a new water inlet metal hose 30 is installed.

[0063] After the replacement is completed, the flow path recovery step S5 is performed. The sequence of this step is also enforced by the mechanical safety interlock mechanism 60. The operator first operates the water inlet tee ball valve 40 to restore the water inlet source from the bypass to the main circuit water inlet pipe 21. After this operation is completed, the interlock is released, and the operator then operates the water outlet tee ball valve 50 to restore the water outlet path from the bypass to the main circuit water outlet pipe 22.

[0064] Finally, the bypass removal step S6 is performed. After confirming that the main cooling circuit 20 flow is restored to normal, all metal hoses 80 used to construct the temporary bypass are removed.

[0065] In addition, the retrofit structure provided by the present application can also be used for online diagnosis. After step S3 is performed, a pressure monitoring device can be connected to the bypass pipeline, the rate of change of the pipeline pressure with time is monitored by temporarily closing the bypass outlet, and the rate is compared with a preset leakage judgment threshold to determine whether the blast furnace tuyere small sleeve 10 has an internal leak.

[0066] The description in this part corresponds to the hardware retrofit step S1 in the method flow, which provides a standardized physical platform and safety guarantee for all subsequent online operations.

[0067] The specific implementation details of the hardware modification step S1 are as follows: for each cooling water pipeline of the blast furnace tuyere small sleeve 10 that needs to be maintained online, an industrial-grade high-temperature and high-pressure three-way ball valve is selected as the water inlet three-way ball valve 40 and the water outlet three-way ball valve 50. The water inlet three-way ball valve 40 is installed between the cooling water inlet of the blast furnace tuyere small sleeve 10 and the original water inlet metal hose 30; the water outlet three-way ball valve 50 is installed between the cooling water outlet of the blast furnace tuyere small sleeve 10 and the main loop water outlet pipe 22. The connection mode of the valve adopts flange connection or threaded connection to ensure the sealing and structural strength of the connection.

[0068] An industrial standard quick connector is uniformly installed at the bypass port of the water inlet three-way ball valve 40 and the water outlet three-way ball valve 50 to form a bypass interface 41 and a bypass interface 51. The design of the quick connector can realize quick, manual or simple tool connection and separation with the external metal hose 80, thereby shortening the time for bypass construction and removal.

[0069] A mechanical safety interlocking mechanism 60 is installed between the operating handle or valve stem of the water inlet three-way ball valve 40 and the water outlet three-way ball valve 50. One specific structure of the mechanism is a linkage plate with a guide groove and a limiting block. When the handle of one valve is in a certain position, the limiting block on the linkage plate will physically block the rotation path of the handle of the other valve, and vice versa. The design of the mechanism ensures that the switching operation of the two valves must strictly follow the preset logical sequence, thereby avoiding the working conditions of pressure buildup due to simultaneous closing of the pipeline caused by human operation errors, or medium mutual mixing caused by simultaneous connection of the main loop and the bypass.

[0070] By performing the above hardware modification step S1, the system platform constructed not only can be used for online replacement, but also provides physical conditions for implementing online diagnosis. For example, when it is necessary to detect the internal leakage of the blast furnace tuyere small sleeve 10, a pressure gauge can be connected to the bypass pipeline, the water outlet is temporarily closed, and by monitoring the change of pressure P(t) with time t, it can be judged whether there is internal leakage according to the following formula:

[0071]

[0072] In the formula, ΔP is the pressure change; Δt is the monitoring time interval; P(t1) is the pressure at the end time; P(t0) is the pressure at the start time; t1-t0 is the monitoring time interval, t1 is the monitoring end time; t0 is the monitoring start time; θ leak is a negative value, which is a pressure decay rate threshold value for judging whether a leakage occurs according to the characteristics and working conditions of the equipment.

[0073] This section describes in detail the implementation of the bypass construction step S2. This step is executed after the specific water inlet metal hose 30 is determined to be replaced, and its purpose is to construct a temporary cooling system completely independent of the main cooling circuit 20.

[0074] The specific operation of this step is as follows: the operator first selects a metal hose 80 with sufficient length and pressure rating, and connects one end of it to the outlet valve of the standby industrial water source 70 using the quick connector at that end. Then, the other end of the metal hose 80 is connected to the bypass interface 41 of the water inlet three-way ball valve 40 corresponding to the target blast furnace tuyere small sleeve 10, thereby establishing a temporary water inlet pipeline.

[0075] Next, the operator uses another metal hose 80 to connect one end of it to the bypass interface 51 of the water outlet three-way ball valve 50 corresponding to the same blast furnace tuyere small sleeve 10. The other end of the metal hose 80 is then directed to the water tank 90 or designated industrial drainage ditch on site, thereby establishing a temporary open-drainage path.

[0076] After all the above connection operations are completed, a complete temporary industrial water open cooling bypass is physically constructed, which uses the standby industrial water source 70 as the water source, flows through the blast furnace tuyere small sleeve 10, and finally drains into the water tank 90. This bypass is ready at this time, but it is not yet watered. The standby industrial water source 70 is chosen as the temporary cooling medium because its water temperature is significantly lower than the high-temperature soft water circulating in the main cooling circuit 20. This design aims to reduce the risk of operators contacting high-temperature media during subsequent replacement operations, thereby improving the safety of the operation.

[0077] This section describes in detail the implementation of the flow path switching step S3. This step is executed after the temporary industrial water open cooling bypass is constructed, and its purpose is to safely and seamlessly switch the cooling flow path of the blast furnace tuyere small sleeve 10 from the main cooling circuit 20 to the temporary bypass.

[0078] The operation of this step is performed by the operator, but its operation sequence is physically constrained by the mechanical safety interlocking mechanism 60. The forced timing is "out first, in second", that is, the outflow side switching must be completed before the inflow side switching can be performed.

[0079] In specific implementation, the operator first attempts to operate the water outlet three-way ball valve 50. At this time, the mechanical safety interlocking mechanism 60 allows this operation. The operator turns the handle of the water outlet three-way ball valve 50, causing the internal flow passage to switch from the position connected to the main circuit outlet pipe 22 to the position connected to the bypass interface 51. After this operation is completed, the water outlet path of the blast furnace tuyere small sleeve 10 is switched from the main circuit to the temporary drainage path leading to the water tank 90.

[0080] After the outlet three-way ball valve 50 is switched to the position, the internal limiting structure of the mechanical safety interlocking mechanism 60 is displaced, and the physical locking of the inlet three-way ball valve 40 is released. At this time, the operator is allowed to operate the inlet three-way ball valve 40. The operator rotates the handle of the inlet three-way ball valve 40, so that the internal flow channel is switched from the position of connecting the main loop inlet pipe 21 to the position of connecting the bypass interface 41.

[0081] After this operation is completed, the industrial water of the standby industrial water source 70 begins to flow through the metal hose 80, enters the blast furnace tuyere small sleeve 10 through the inlet three-way ball valve 40 for cooling, and the cooled water is discharged into the water tank 90 through the outlet three-way ball valve 50 and another section of the metal hose 80. At this time, the blast furnace tuyere small sleeve 10 has been completely isolated from the main cooling loop 20 and is independently and continuously cooled by the temporary industrial water open cooling bypass. The forced time sequence design of "outlet first and then inlet" ensures that the cooling flow path of the blast furnace tuyere small sleeve 10 is not completely closed at any time, thereby avoiding damage to the equipment due to pipe pressure.

[0082] This part describes the implementation details of the online replacement step S4 in detail. This step is performed after the cooling flow path of the blast furnace tuyere small sleeve 10 has been completely switched to the temporary bypass and is stably running.

[0083] In this step, since the cooling of the blast furnace tuyere small sleeve 10 is continuously performed by the standby industrial water source 70 through the independent industrial water open cooling bypass, it is completely isolated from the main cooling loop 20, and the production process of the blast furnace body is not affected.

[0084] The operating personnel perform physical replacement on the faulty inlet metal hose 30 on the premise that the bypass cooling condition is stable. This operation includes: disassembling the connecting pieces at both ends of the faulty inlet metal hose 30, removing it from the pipeline; then, installing a new inlet metal hose 30 with the same specifications and model at the original position, and completing the connection and fastening of the inlet three-way ball valve 40 and the blast furnace tuyere small sleeve 10 inlet.

[0085] During the entire execution of this step, the operator can change the cooling water flow into the temporary bypass as needed by adjusting the control valve at the outlet of the standby industrial water source 70, to ensure that the cooling effect on the blast furnace tuyere small sleeve 10 during the replacement operation is always maintained within the appropriate range.

[0086] This part describes the implementation details of the flow path recovery step S5 in detail. This step is performed after the installation of the new inlet metal hose 30, and its purpose is to safely and reliably restore the cooling flow path of the blast furnace tuyere small sleeve 10 from the temporary industrial water open cooling bypass to the main cooling loop 20.

[0087] The operation sequence of this step is also physically constrained by the mechanical safety interlock 60. The forced sequence is "in before out", contrary to the switching sequence of step S3, i.e. the restoration of the inlet side must be completed before the restoration of the outlet side.

[0088] In practice, the operator first operates the inlet three-way ball valve 40. The internal structure of the mechanical safety interlock 60 allows this operation. The operator turns the handle of the inlet three-way ball valve 40 so that its internal flow channel is restored from the position of communicating with the bypass interface 41 to the position of communicating with the main circuit inlet pipe 21. After this operation is completed, the high-temperature soft water from the main cooling circuit 20 reenters the blast furnace tuyere small sleeve 10, and at the same time, the water supply path from the standby industrial water source 70 is cut off.

[0089] After the inlet three-way ball valve 40 is completely restored to the position of communicating with the main circuit, the limit structure of the mechanical safety interlock 60 is displaced accordingly, thereby releasing the physical locking of the outlet three-way ball valve 50. At this time, the operator is allowed to operate the outlet three-way ball valve 50.

[0090] Subsequently, the operator turns the handle of the outlet three-way ball valve 50 so that its internal flow channel is restored from the position of communicating with the bypass interface 51 to the position of communicating with the main circuit outlet pipe 22. After this operation is completed, the water cooled by the blast furnace tuyere small sleeve 10 no longer drains into the water tank 90, but reenters the circulating pipeline of the main cooling circuit 20. At this point, the cooling flow path of the blast furnace tuyere small sleeve 10 is completely restored to the normal operating state of closed-loop circulation cooling by the main cooling circuit 20. This forced sequence design of "in before out" ensures that during the restoration process, the pressure of the main cooling circuit 20 is first introduced into the system, and then connected to the outlet, thereby avoiding the possibility of backflow of the main circuit medium into the temporary drainage pipeline, and ensuring smooth flow path restoration.

[0091] This part describes the implementation details of the bypass removal step S6 in detail. This step is the final step of the entire online replacement method, which is executed after the cooling flow path of the blast furnace tuyere small sleeve 10 is completely restored to the main cooling circuit 20 and its stable operation is confirmed.

[0092] The specific implementation of this step is: after step S5 is completed, first monitor the cooling branch where the blast furnace tuyere small sleeve 10 is located through the central monitoring system of the blast furnace, and confirm that the flow and pressure parameters of the blast furnace tuyere small sleeve 10 in the main cooling circuit 20 have been restored to the normal operating set value range.

[0093] After this confirmation operation is completed, the operator closes the outlet control valve of the standby industrial water source 70, thereby completely cutting off the water supply of the temporary bypass.

[0094] Subsequently, the operator removes the two metal hoses 80 connected to the bypass interfaces 41, 51 of the water inlet and outlet three-way ball valves 40, 50 in sequence. Due to the use of quick couplings, this removal operation can be quickly completed.

[0095] At this point, all temporary equipment for the online replacement operation has been removed from the site, the bypass interfaces 41, 51 of the water inlet and outlet three-way ball valves 40, 50 are in a closed standby state, the entire method flow of the blast furnace online replacement of the tuyere small sleeve water inlet metal hose is completed, and the entire blast furnace production is uninterrupted.

[0096] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method of modifying a blast furnace to replace a tuyere bushing water inlet metal hose on-line, characterized in that, The method comprises the following steps: S1, hardware modification step: modifying the cooling water pipeline of the blast furnace tuyere small sleeve, the modification comprising: installing a water inlet three-way ball valve before the cooling water inlet of the blast furnace tuyere small sleeve, and installing a water outlet three-way ball valve after the water outlet thereof, wherein the water inlet three-way ball valve and the water outlet three-way ball valve are both provided with a port for connecting the main cooling loop and a bypass interface for connecting an external pipeline; S2, bypass construction step: when it is necessary to replace the water inlet metal hose online, the following operations are performed: connecting a spare industrial water source to the bypass interface of the water inlet three-way ball valve by using a metal hose to form a water inlet source, and connecting the bypass interface of the water outlet three-way ball valve to a water tank by using another metal hose to form an open drainage path, thereby constructing an industrial water open cooling bypass; S3, flow path switching step: operating the water inlet three-way ball valve and the water outlet three-way ball valve to seamlessly switch the cooling flow path of the blast furnace tuyere small sleeve from the main cooling loop to the constructed industrial water open cooling bypass, and continuously cooling by using the spare industrial water; S4, online replacement step: replacing the water inlet metal hose in a state of continuous cooling by using the industrial water open cooling bypass; S5, flow path recovery step: after the replacement is completed, the water inlet three-way ball valve and the water outlet three-way ball valve are operated again to recover the cooling flow path of the blast furnace tuyere small sleeve from the industrial water open cooling bypass to the soft water inlet end of the main cooling loop; S6, bypass removal step: after confirming that the flow of the main cooling loop is normal, the metal hose used for constructing the industrial water open cooling bypass is removed.

2. The method of claim 1, wherein the method further comprises: The modification of the cooling water pipeline of the blast furnace tuyere small sleeve further comprises: a mechanical safety interlocking mechanism is arranged between the water inlet three-way ball valve and the water outlet three-way ball valve, and the mechanical safety interlocking mechanism is used to physically force the water inlet three-way ball valve and the water outlet three-way ball valve to follow a preset safety time sequence in subsequent switching and recovery operations.

3. The method of claim 1, wherein the method further comprises: In the step of constructing a temporary industrial water open cooling bypass, selecting the spare industrial water as the water inlet source further comprises: The water temperature of the spare industrial water is lower than that of the soft water in the main cooling loop.

4. The method of claim 1, wherein the method further comprises: When the water inlet three-way ball valve and the water outlet three-way ball valve are operated to switch the cooling flow path to the industrial water open cooling bypass, the preset safety time sequence forced by the mechanical safety interlocking mechanism is: first operating the water outlet three-way ball valve to switch the flow path from the main cooling loop to the open drainage path, and then allowing the water inlet three-way ball valve to be operated to switch the flow path from the main cooling loop to the path supplied with water by the spare industrial water.

5. The method of claim 1, wherein the method further comprises: Before the step of replacing the water inlet metal hose, the method further comprises: adjusting the control valve of the spare industrial water source to adjust the water amount entering the industrial water open cooling bypass, so as to ensure that the cooling effect on the blast furnace tuyere small sleeve is appropriate.

6. The method of claim 1, wherein the method further comprises: When the cooling flow path is switched from the industrial water open cooling bypass to the main cooling circuit, the mechanical safety interlock mechanism forces a preset safety timing that the water inlet three-way ball valve is operated first to switch the cooling flow path from the industrial water open cooling bypass to the main cooling circuit, and then the water outlet three-way ball valve is allowed to be operated to switch the cooling flow path from the industrial water open cooling bypass to the main cooling circuit.

7. The method of claim 1, wherein the method further comprises: The method further comprises an online diagnosis function, which is realized by detecting the internal leakage of the blast furnace tuyere small sleeve through a diagnosis tool connected to the industrial water open cooling bypass after the cooling flow path of the blast furnace tuyere small sleeve is switched to the industrial water open cooling bypass and before it is switched back to the main cooling circuit.

8. The method of claim 1, wherein the method further comprises: The specific method of the internal leakage detection is: connecting a pressure gauge to the industrial water open cooling bypass, temporarily closing the bypass outlet, monitoring the pressure P(t), and calculating the pressure decay rate according to the following formula: when it is less than the preset leakage judgment threshold θ leak , it is determined that there is internal leakage: In the formula, ΔP is the pressure change amount; Δt is the monitoring time interval; P(t1) is the pressure at the end time; P(t0) is the pressure at the start time; t1-t0 is the monitoring time interval, t1 is the monitoring end time; t0 is the monitoring start time; θ leak is the preset leakage judgment threshold.

9. The method of claim 1, wherein the method further comprises: The method further comprises an online chemical cleaning function, which is realized by connecting the inlet and outlet of a mobile chemical cleaning unit to the bypass interfaces of the water inlet three-way ball valve and the water outlet three-way ball valve respectively, and switching the cooling flow path of the blast furnace tuyere small sleeve to a cleaning sub-circuit composed of the chemical cleaning unit and the blast furnace tuyere small sleeve, which is isolated from the main cooling circuit, to perform independent online chemical cleaning.

10. The method of claim 1, wherein the method further comprises: After the online chemical cleaning, before the cooling flow path is switched back to the main cooling circuit, a flushing step is further included, which is realized by disconnecting the chemical cleaning unit and connecting the standby industrial water to the blast furnace tuyere small sleeve for sufficient flushing to prevent chemical agents from entering the main cooling circuit.

Images