Emergency water replenishing system for waste heat boiler

Abstract

The invention discloses an emergency water replenishing system for a waste heat boiler, and relates to the field of industrial waste heat recovery. The emergency water supplementing system for the waste heat boiler comprises a water supplementing tank, a softened water tank, a main water supplementing unit, an emergency water supplementing unit and a control unit. According to the emergency water supplementing system for the waste heat boiler, a set of independent emergency water supplementing unit with a complete structure is arranged outside the main water supplementing unit in parallel and works cooperatively with the control unit, and a redundant water supplementing path is constructed; when the liquid level of the water replenishing tank is reduced to an emergency water replenishing triggering water level lower than a main water replenishing starting threshold value, the control unit can automatically identify the emergency state and start the emergency water replenishing unit to quickly replenish water, so that the problem that the whole water replenishing system is paralyzed due to a single fault point in the prior art is solved; the overall reliability of the waste heat boiler water supply system is improved, and the system safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of industrial waste heat recovery technology, specifically to an emergency water replenishment system for waste heat boilers. Background Technology

[0002] In the field of industrial waste heat recovery, waste heat boiler systems are key waste heat utilization equipment, and their safe and stable operation highly depends on reliable and continuous boiler feedwater. Currently, common waste heat boiler systems generally adopt a single makeup water path design. This scheme typically includes a makeup water tank (deaerator) for storing and supplying demineralized water, a softened water tank, and a main makeup water pipeline connecting the two and driven by a main makeup water pump. The system monitors the liquid level through a water level sensor installed on the makeup water tank and transmits the signal to the control system. When the water level is lower than the preset main makeup water start threshold, the control system starts the main makeup water pump, replenishing the makeup water tank from the softened water tank through the main makeup water pipeline.

[0003] However, the reliability of the aforementioned existing technology depends entirely on the normal operation of this single water replenishment path. When the main water replenishment pump experiences mechanical failure, the main water replenishment pipeline becomes blocked or leaks, or the control power supply is interrupted, the entire water replenishment path will fail. At this time, the water level in the water replenishment tank will continue to drop and cannot be replenished, which can easily lead to the waste heat boiler entering a water shortage operation state. Boiler water shortage is a serious operating accident, which can cause the boiler tubes to overheat, deform, or even burst. This not only endangers equipment safety and personnel safety but also causes unplanned shutdowns and economic losses. In view of the shortcomings of the existing technology, this invention provides an emergency water replenishment system for waste heat boilers to solve the above problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an emergency water replenishment system for waste heat boilers. By setting up a complete and independent emergency water replenishment unit in parallel with the main water replenishment unit, and having it work in conjunction with the control unit, a redundant water replenishment path is constructed. When the main water replenishment path fails due to a malfunction, and the water level in the replenishment tank drops to an emergency water replenishment trigger level lower than the main water replenishment activation threshold, the control unit can automatically identify the emergency state and activate the emergency water replenishment unit for rapid water replenishment. This solves the problem of existing technologies where a single point of failure can paralyze the entire water replenishment system, improves the overall reliability of the waste heat boiler feedwater system, avoids the risk of boiler water shortage caused by water replenishment interruption, and ensures system safety.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an emergency water supply system for a waste heat boiler, comprising: Makeup water tank, used to store and supply makeup water to the waste heat boiler; A water softening tank is used to store softened water. The main water supply unit includes a main water supply pump and a main water supply pipeline, wherein the main water supply pipeline is connected between the softened water tank and the water supply tank; An emergency water supply unit, which is arranged in parallel with the main water supply unit, includes an emergency water supply pump and an emergency water supply pipeline. One end of the emergency water supply pipeline is connected to the softened water tank, and the other end is connected to the water supply tank. The control unit is connected to the water level sensor installed on the water replenishment tank to monitor the liquid level of the water replenishment tank. The control unit is configured to automatically start the emergency water replenishment unit to replenish water to the water replenishment tank when the liquid level of the water replenishment tank drops to the emergency water replenishment trigger level below the main water replenishment start threshold.

[0006] Preferably, the emergency water supply unit further includes a control valve installed on the emergency water supply pipeline. When the control unit starts the emergency water supply unit, it simultaneously controls the opening of the control valve and the start of the emergency water supply pump.

[0007] Preferably, the control unit is a programmable logic controller (PLC). The control unit has a preset first water level threshold L1 and a second water level threshold L2. The first water level threshold L1 is the main water replenishment activation threshold, and the second water level threshold L2 is the emergency water replenishment trigger water level that is lower than L1. When the water level is lower than L1, the control unit prioritizes activating the main water replenishment unit. When the water level is lower than L2, the control unit determines that the main water replenishment path has failed and activates the emergency water replenishment unit.

[0008] Preferably, the control unit further includes a fault judgment module for receiving the operating status signal of the main water supply pump or the pressure signal of the main water supply pipeline; when the water level in the water supply tank is lower than L1 and the fault judgment module determines that the main water supply unit is faulty, the control unit directly starts the emergency water supply unit.

[0009] Preferably, the system further includes an interlock module connected to the control unit, which is used to implement an operational interlock between the main water supply pump and the emergency water supply pump, so that the two cannot operate simultaneously.

[0010] Preferably, the interlocking logic of the interlocking module is configured to: prioritize the operation of the main water supply unit; when the emergency water supply unit is started, if the main water supply unit is troubleshooted and a start request is received, the main water supply unit should be started only after the emergency water supply unit stops operating.

[0011] Preferably, the emergency water supply pump is a diesel engine driven pump, the emergency water supply pump has a power source independent of the plant's power grid, the control valve is an electric valve or a pneumatic valve, and the electric valve or pneumatic valve is equipped with a manual operating mechanism.

[0012] Preferably, the main water supply pipe and the emergency water supply pipe have the same diameter, and the main water supply pump and the emergency water supply pump have the same rated flow rate.

[0013] Preferably, the control unit is connected to an operation panel, which is equipped with a manual and automatic mode switch and a manual control button for forcibly starting or stopping the emergency water replenishment unit.

[0014] Preferably, the system further includes an alarm unit connected to the control unit, which is used to issue an audible and visual alarm signal when the water level in the water tank drops to the emergency water replenishment trigger level, when the emergency water replenishment unit is activated, or when the emergency water replenishment unit itself malfunctions.

[0015] The technical effects and advantages of this invention are as follows: 1. This emergency water replenishment system for waste heat boilers establishes a redundant water replenishment path by setting up a complete and independent emergency water replenishment unit in parallel with the main water replenishment unit and working in conjunction with the control unit. When the main water replenishment path fails due to a fault and the water level in the water replenishment tank drops to the emergency water replenishment trigger level, which is lower than the main water replenishment activation threshold, the control unit can automatically identify the emergency state and activate the emergency water replenishment unit for rapid water replenishment. This solves the problem of the entire water replenishment system being paralyzed due to a single fault point in the existing technology, improves the overall reliability of the waste heat boiler feedwater system, avoids the risk of boiler water shortage caused by water replenishment interruption, and ensures system safety.

[0016] 2. This emergency water replenishment system for waste heat boilers achieves intelligent decision-making and priority division of water replenishment strategies by pre-setting graded liquid level thresholds in the control unit and introducing fault judgment logic. The system prioritizes the use of the main water replenishment path and only automatically switches to the emergency path when it fails and the liquid level reaches a more dangerous warning line. This hierarchical response mechanism ensures the efficient operation of the main system under normal conditions and enables rapid and accurate automatic intervention in emergency situations, reducing safety hazards caused by human judgment errors or response delays.

[0017] 3. This emergency water supply system for waste heat boilers uses key components such as a diesel-powered emergency water supply pump and valves equipped with manual operating mechanisms. These components ensure that the system still has emergency water supply capabilities under extreme conditions such as power outages in the plant area. At the same time, an interlock module is set up to ensure that the main pump and the emergency pump do not operate simultaneously. The system is also equipped with manual and automatic switching and forced operation functions, which makes the system automated and reliable, and allows for timely manual intervention. The entire system has a compact structure, flexible piping layout, convenient implementation, and controllable modification costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the system structure of the present invention; Figure 2 This is a schematic diagram of the control panel of the present invention; Figure 3 This is a schematic diagram showing the connection between the control unit of the present invention and the fault judgment module, the interlock module and the alarm unit; Figure 4 This is a control flowchart for the emergency water replenishment unit of the present invention; Figure 5 This is a diagram showing the water level logic judgment of the control unit in this invention. Figure 6 This is the fault diagnosis and emergency start logic diagram of the present invention.

[0020] In the diagram: 1. Water supply tank; 2. Softened water tank; 3. Water level sensor; 10. Main water supply unit; 11. Main water supply pump; 12. Main water supply pipeline; 20. Emergency water supply unit; 21. Emergency water supply pump; 22. Emergency water supply pipeline; 23. Control valve; 30. Control unit; 31. Fault diagnosis module; 40. Interlock module; 50. Operation panel; 51. Manual and automatic mode switch; 52. Manual control button; 60. Alarm unit. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This embodiment discloses an emergency water replenishment system for a waste heat boiler, according to the appendix. Figure 1 To be continued Figure 3As shown, the system includes a water supply tank 1, a softened water tank 2, a main water supply unit 10, an emergency water supply unit 20, and a control unit 30. The water supply tank 1 is used to store and supply water to the waste heat boiler. The water supply tank 1 is equipped with a water level sensor 3 for real-time monitoring of its internal liquid level. The softened water tank 2 is used to store softened water. The main water supply unit 10 includes a main water supply pump 11 and a main water supply pipe 12. The main water supply pipe 12 is connected between the softened water tank 2 and the water supply tank 1, forming a regular water supply path. The emergency water supply unit 20 is arranged in parallel with the main water supply unit 10 and includes an emergency water supply pump 21 and an emergency water supply pipe 22. One end of the emergency water supply pipe 22 is connected to the softened water tank 2, and the other end is connected to the water supply tank 1. The control unit 30 is signal-connected to the water level sensor 3 and is used to receive and process the liquid level signal.

[0023] This invention constructs a physically isolated backup water supply path by setting up an emergency water supply unit 20 that runs completely parallel to the main water supply unit 10, and configuring an independent emergency water supply pump 21 and emergency water supply pipeline 22. This design ensures that the emergency path remains completely unaffected when the main water supply pipeline 12 is blocked or leaks, or when the main water supply pump 11 fails, solving the problem of potential simultaneous failure of the shared pipeline between the main and backup pumps in traditional systems. The control unit 30 automatically initiates emergency water supply based on the emergency water supply trigger water level, achieving rapid and automatic response after the main water supply fails, thus improving the redundancy reliability and system safety of the waste heat boiler water supply.

[0024] The control unit 30 is a programmable logic controller (PLC) with a first water level threshold L1 and a second water level threshold L2 preset within it. The first water level threshold L1 is the main water replenishment start threshold, and the second water level threshold L2 is the emergency water replenishment trigger level below L1. The control unit 30 is configured such that when the liquid level in the water replenishment tank 1 drops below L1, the main water replenishment unit 10 is automatically started to replenish water. When the liquid level drops further below L2, the control unit 30 will determine that the main water replenishment path may fail and automatically start the emergency water replenishment unit 20 to replenish water to the water replenishment tank 1. Furthermore, the emergency water replenishment unit 20 also includes a control valve 23 installed on the emergency water replenishment pipeline 22. When the control unit 30 starts the emergency water replenishment unit 20, it will simultaneously output a control signal to control the control valve 23 to open and start the emergency water replenishment pump 21.

[0025] Furthermore, the control unit 30 also includes a fault judgment module 31, which is used to receive the operating status signal of the main water supply pump 11 and / or the pressure signal on the main water supply pipeline 12. The operating status signal includes, for example, operation and stop feedback, fault alarm, etc. When the liquid level of the water supply tank 1 is lower than the first water level threshold L1, and the fault judgment module 31 determines that there is a fault in the main water supply unit 10 based on the received signal, such as an electrical fault in the main water supply pump 11 or an abnormally low pressure in the main water supply pipeline 12, the control unit 30 will no longer wait for the liquid level to drop to L2, but will directly start the emergency water supply unit 20 to achieve a rapid emergency response.

[0026] This emergency water replenishment system for waste heat boilers achieves intelligent decision-making and clear priority division of water replenishment strategies by pre-setting graded liquid level thresholds in the control unit 30 and introducing fault judgment logic. The system prioritizes the use of the main water replenishment path and only automatically switches to the emergency path when it fails and the liquid level reaches a more dangerous warning line. This hierarchical response mechanism ensures the efficient operation of the main system under normal conditions and enables rapid and accurate automatic intervention in emergency situations, reducing safety hazards caused by human judgment errors or response delays.

[0027] The system also includes an interlock module 40, which is connected to the control unit 30. Its internal logic is configured to achieve operational interlock between the main water supply pump 11 and the emergency water supply pump 21, ensuring that the two cannot operate simultaneously to prevent pipeline impact or logic conflict. In particular, the interlock logic of the interlock module 40 is configured as follows: in automatic mode, the system prioritizes the operation of the main water supply unit 10. When the emergency water supply unit 20 is started due to a fault or low liquid level L2, if the fault of the main water supply unit 10 is resolved and a start request is received, the interlock module 40 will maintain the operation of the emergency water supply unit 20 until the operator manually stops the emergency water supply through the control unit 30 or the operation panel 50, or the liquid level is restored to a safe level, before the main water supply unit 10 is allowed to start.

[0028] Specifically, the emergency water supply pump 21 is preferably a diesel engine driven pump. The emergency water supply pump 21 has a power source independent of the plant's power grid, ensuring reliable start-up and operation even in extreme situations such as a plant-wide power outage. The control valve 23 is an electric valve or a pneumatic valve, and the electric valve or pneumatic valve is equipped with a manual operating mechanism to allow for manual intervention when the automatic control system fails. The main water supply pipeline 12 and the emergency water supply pipeline 22 have the same pipe diameter, and the main water supply pump 11 and the emergency water supply pump 21 have the same rated flow rate, ensuring that the emergency water supply can completely replace the function of the main water supply.

[0029] Specifically, the control unit 30 is connected to an operation panel 50, which is equipped with a manual and automatic mode switch 51 and a manual control button 52 for forcibly starting or stopping the emergency water replenishment unit 20, so that operators can operate and test according to the site conditions. The system also includes an alarm unit 60, which is connected to the control unit 30 and is used to issue an audible and visual alarm signal to remind the operators when the water level in the water tank 1 drops to the emergency water replenishment trigger level L2, the emergency water replenishment unit 20 is started, or the emergency water replenishment unit 20 itself malfunctions, such as when the diesel engine fails to start.

[0030] It is particularly important to emphasize that the core design of this system lies in the dual-path parallel water replenishment and intelligent hierarchical control. The main water replenishment unit 10 is responsible for daily water replenishment, while the emergency water replenishment unit 20 serves as an independent hot standby system. It automatically and seamlessly switches in when the main path fails or the liquid level is critical, greatly improving the reliability of the waste heat boiler water supply. The control unit 30 realizes an intelligent process from early warning to emergency response based on the dual judgment of water level threshold and equipment status.

[0031] It is particularly important to emphasize that the design of the interlock module 40 avoids the risks that may arise from the simultaneous operation of the two pumps. The introduction of the fault judgment module 31 enables the system to activate the emergency path in advance when the main water replenishment unit 10 fails, rather than passively waiting for the liquid level to drop to a lower point. This is an active safety strategy. The independently powered diesel pump and the valve with manual mechanism constitute a multi-layered backup guarantee, ensuring that the system can operate effectively under various abnormal conditions.

[0032] It is particularly important to emphasize that the water level sensor 3 is preferably a float-type sensor, and the emergency water supply pump 21 is set as a manually startable diesel engine driven pump to realize emergency water supply. It can be manually started in the event of a power outage to ensure stable operation.

[0033] Example 1: This example uses the normal main water supply and emergency water supply switching process as an example, combined with the attached... Figure 1 To be continued Figure 3 The workflow is explained in detail below: The system is initially in automatic monitoring mode. The water level in water tank 1 is normal and higher than the first water level threshold L1.

[0034] When the waste heat boiler consumes water, causing the water level in the water supply tank 1 to drop below the first water level threshold L1, the water level sensor 3 transmits a signal to the control unit 30.

[0035] When the control unit 30 receives a signal lower than L1, it first checks the status of the main water supply pump 11 and the pipeline pressure through the fault judgment module 31. If there is no fault, it issues a command to start the main water supply pump 11 and starts to supply water from the softened water tank 2 to the water supply tank 1 through the main water supply pipeline 12.

[0036] If the main water supply unit 10 is operating normally, the liquid level will gradually rise. However, if the main water supply unit 10 fails to replenish water effectively due to pump failure or pipeline leakage, the liquid level will continue to drop.

[0037] When the liquid level drops below the second water level threshold L2, which is the emergency water replenishment trigger level, the control unit 30 determines that the main water replenishment path has failed.

[0038] If the main water supply pump 11 is still running, the control unit 30 immediately stops the main water supply pump 11 through the interlock module 40, and then issues an emergency start command.

[0039] The emergency start command simultaneously opens the control valve 23 on the emergency water supply pipeline 22 and starts the diesel engine-driven emergency water supply pump 21.

[0040] Softened water is supplied to water tank 1 through emergency water supply pipe 22, and at the same time, alarm unit 60 issues an audible and visual alarm to activate emergency water supply.

[0041] Upon receiving the notification, operators can go to the control panel 50 to check the status and take further action. After the liquid level is restored, the emergency water replenishment unit 20 must be manually shut down, and the system will return to normal monitoring status.

[0042] Example 2: This example uses the emergency response procedure under main water supply failure as an example, combined with the appendix. Figure 1 To be continued Figure 3 The workflow is explained in detail below: The system is in automatic monitoring mode, and the water level in water tank 1 is normal.

[0043] The liquid level begins to drop. When it drops below the first water level threshold L1, the control unit 30 attempts to start the main water supply unit 10 according to the preset logic.

[0044] At this time, the fault judgment module 31 monitors the fault alarm signal of the main water supply pump 11 in real time, such as motor overload tripping, or the pressure sensor on the main water supply pipeline 12 showing no pressure change or extremely low pressure.

[0045] The integrated logic judgment of the control unit 30 indicates that the main water replenishment unit 10 has an immediate fault and cannot complete the water replenishment task.

[0046] To prevent the liquid level from continuing to drop unnecessarily to the more dangerous L2 level, the control unit 30 immediately stopped waiting and directly executed the emergency water replenishment procedure.

[0047] The control unit 30 ensures that the main water supply pump 11 is disabled through the interlock module 40, and then outputs a command to open the control valve 23 and start the emergency water supply pump 21.

[0048] Emergency water replenishment unit 20 is put into operation immediately, drawing water directly from softened water tank 2 to replenish water tank 1.

[0049] Alarm unit 60 simultaneously triggers two levels of alarms: main water supply failure and emergency water supply activation, indicating to operators the fault location and that the system has been switched to standby mode.

[0050] This process enables rapid emergency takeover in the event of a main water supply failure, minimizing the water supply interruption time and ensuring boiler safety. Operators need to troubleshoot and repair the main water supply unit 10 based on the alarm information. After repair, the emergency water supply unit 20 can be manually stopped on the control panel 50, and the system will return to automatic standby mode.

[0051] In summary, this emergency water replenishment system for waste heat boilers constructs a redundant water replenishment path by setting up a complete and independent emergency water replenishment unit 20 in parallel with the main water replenishment unit 10, which works in conjunction with the control unit 30. When the main water replenishment path fails due to a fault, and the liquid level in the water replenishment tank 1 drops to the emergency water replenishment trigger level, which is lower than the main water replenishment activation threshold, the control unit 30 can automatically identify the emergency state and activate the emergency water replenishment unit 20 for rapid water replenishment. This solves the problem of the existing technology where the entire water replenishment system is paralyzed due to a single fault point, improves the overall reliability of the waste heat boiler feedwater system, avoids the risk of boiler water shortage caused by water replenishment interruption, and ensures system safety.

[0052] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An emergency water supply system for a waste heat boiler, characterized in that, include: Makeup water tank (1) is used to store and supply makeup water to the waste heat boiler; Softening water tank (2) is used to store softened water; The main water supply unit (10) includes a main water supply pump (11) and a main water supply pipe (12), wherein the main water supply pipe (12) is connected between the softened water tank (2) and the water supply tank (1); An emergency water supply unit (20) is arranged in parallel with the main water supply unit (10), including an emergency water supply pump (21) and an emergency water supply pipeline (22). One end of the emergency water supply pipeline (22) is connected to the softened water tank (2), and the other end is connected to the water supply tank (1). The control unit (30) is connected to the water level sensor (3) installed on the water replenishment tank (1) to monitor the liquid level of the water replenishment tank (1). The control unit (30) is configured to automatically start the emergency water replenishment unit (20) to replenish water to the water replenishment tank (1) when the liquid level of the water replenishment tank (1) drops to the emergency water replenishment trigger level below the main water replenishment start threshold.

2. The emergency water supply system for a waste heat boiler according to claim 1, characterized in that, The emergency water supply unit (20) also includes a control valve (23) installed on the emergency water supply pipeline (22). When the control unit (30) starts the emergency water supply unit (20), it simultaneously controls the opening of the control valve (23) and the start of the emergency water supply pump (21).

3. The emergency water supply system for a waste heat boiler according to claim 2, characterized in that, The control unit (30) is a programmable logic controller. The control unit (30) has a first water level threshold L1 and a second water level threshold L2 preset in it. The first water level threshold L1 is the main water replenishment start threshold, and the second water level threshold L2 is the emergency water replenishment trigger water level that is lower than L1. When the liquid level is lower than L1, the control unit (30) will start the main water replenishment unit (10) first. When the liquid level is lower than L2, the control unit (30) will determine that the main water replenishment path has failed and start the emergency water replenishment unit (20).

4. The emergency water supply system for a waste heat boiler according to claim 3, characterized in that, The control unit (30) also includes a fault judgment module (31) for receiving the operating status signal of the main water supply pump (11) or the pressure signal of the main water supply pipeline (12); when the liquid level of the water supply tank (1) is lower than L1 and the fault judgment module (31) determines that the main water supply unit (10) is faulty, the control unit (30) directly starts the emergency water supply unit (20).

5. The emergency water supply system for a waste heat boiler according to claim 2, characterized in that, The system also includes an interlock module (40), which is connected to the control unit (30) and is used to implement an operation interlock between the main water supply pump (11) and the emergency water supply pump (21) so that the two cannot operate at the same time.

6. A waste heat boiler emergency water supply system according to claim 5, characterized in that, The interlocking logic of the interlocking module (40) is configured as follows: prioritize the operation of the main water supply unit (10); when the emergency water supply unit (20) is started, if the main water supply unit (10) is fault-free and a start request is received, it is necessary to wait for the emergency water supply unit (20) to stop operating before starting the main water supply unit (10).

7. A waste heat boiler emergency water supply system according to claim 2, characterized in that, The emergency water supply pump (21) is a diesel engine driven pump. The emergency water supply pump (21) has a power source independent of the plant's power grid. The control valve (23) is an electric valve or a pneumatic valve, and the electric valve or pneumatic valve is equipped with a manual operation mechanism.

8. The emergency water supply system for a waste heat boiler according to claim 1, characterized in that, The main water supply pipe (12) and the emergency water supply pipe (22) have the same diameter, and the main water supply pump (11) and the emergency water supply pump (21) have the same rated flow rate.

9. A waste heat boiler emergency water supply system according to claim 1, characterized in that, The control unit (30) is connected to an operation panel (50), which is provided with a manual and automatic mode switching switch (51) and a manual control button (52) for forcibly starting or stopping the emergency water replenishment unit (20).

10. A waste heat boiler emergency water supply system according to claim 9, characterized in that, The system also includes an alarm unit (60), which is connected to the control unit (30) and is used to issue an audible and visual alarm signal when the liquid level of the water tank (1) drops to the emergency water replenishment trigger level, the emergency water replenishment unit (20) is started, or the emergency water replenishment unit (20) itself malfunctions.

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