Water tank device for double-layer seal of upper water seal of boiler bottom of thermal power unit

Abstract

This invention discloses a double-layer sealing water tank device for the furnace bottom of a thermal power unit, comprising an inner water tank, an outer water tank, and an early warning mechanism. The inner water tank accommodates the upper water seal baffle to isolate the furnace from the outside and maintain a seal. A first overflow port is provided along the edge of the inner water tank, and the first overflow port is connected to the outer water tank. A second overflow port is provided along the edge of the outer water tank, and the height of the second overflow port is lower than the height of the first overflow port. A slag-prevention slope is provided at the top of the outer water tank. Both the outer and inner water tanks have drain valves at their bottoms. The drain valve of the inner water tank passes through the outer water tank via a pipeline. The main water source replenishes water to the inner water tank, and a backup water source is connected to the inner water tank. The early warning mechanism includes an alarm and a water level sensor arranged in the outer water tank, with the alarm and water level sensor electrically connected. The double-layer sealing water tank device for the furnace bottom of a thermal power unit provided by this invention has the advantages of small water level fluctuations, good sealing effect, and early warning.

Description

Technical Field

[0001] This invention relates to the field of water seal structure technology, and in particular to a double-layer sealing water tank device for the bottom of a thermal power unit furnace. Background Technology

[0002] Traditional water seals are single-layer annular water tank structures. In actual operation, the single-layer water tank relies solely on a single water level to maintain the seal. When the water supply system malfunctions, evaporation is too rapid, or slag falling into the water tank bursts, the water level in the tank can easily fall below the lowest point of the upper water seal baffle, leading to water seal breakdown. This causes the boiler flame center to rise, steam and tube wall temperatures to exceed limits, and flue gas temperatures to be abnormally high. In severe cases, it can cause furnace negative pressure fluctuations, unstable combustion, and even safety hazards. Lack of early warning mechanisms: Traditional structures lack water level and negative pressure monitoring alarms, making it impossible for operators to detect early signs of water seal failure in a timely manner. They can only react passively after an accident occurs. Single water supply source and weak emergency response capabilities: With a single water supply source, there is no backup emergency water source when slag cooling water is interrupted or water quality is abnormal, making it impossible to ensure continuous operation of the water seal. Summary of the Invention

[0003] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0004] A single-layer water tank has poor water seal performance.

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] To address this, embodiments of the present invention propose a double-layer sealing water tank device for the furnace bottom of a thermal power unit, comprising an inner water tank, an outer water tank, and an early warning mechanism. The inner water tank is used to accommodate an upper water seal baffle to isolate the inside and outside of the furnace and maintain a seal. A first overflow port is provided on the edge of the inner water tank, and the first overflow port is connected to the outer water tank. A second overflow port is provided on the edge of the outer water tank, and the height of the second overflow port is lower than the height of the first overflow port so that the liquid level in the outer water tank is lower than the liquid level in the inner water tank. A slag-prevention slope is provided on the top of the outer water tank. Both the outer and inner water tanks are provided with drain valves at their bottoms. The drain valve of the inner water tank passes through the outer water tank via a pipeline. The main water source replenishes water to the inner water tank, and a backup water source is connected to the inner water tank. The early warning mechanism includes an alarm and a water level sensor arranged in the outer water tank. The water level sensor is used to monitor the liquid level in the outer water tank, and the alarm is electrically connected to the water level sensor.

[0007] The double-layer sealing water tank device for the furnace bottom of a thermal power unit according to embodiments of the present invention has the advantages and technical benefits of small water level fluctuations, good sealing effect, and early warning. This application ensures that the upper water seal baffle remains stable below the water level in the inner water tank for a long period, preventing water seal breakdown; a slag discharge slope is provided above the outer water tank to prevent slag falling from the furnace into the outer water tank, ensuring a stable water level in the outer water tank and preventing a passageway from forming between the inside and outside of the furnace through the outer water tank; by setting up a water level gauge and pressure transmitter, an early warning function can be provided, allowing operators to promptly detect signs of water seal failure and avoid reactive handling after an accident; setting industrial water as backup replenishment water can prevent water seal interruption due to interruption of slag cooling water or abnormal water quality.

[0008] In some embodiments, the warning mechanism further includes a pressure transmitter disposed within the cavity of the outer water tank for monitoring pressure, and the pressure transmitter is electrically connected to the alarm.

[0009] In some embodiments, the slope of the slag-prevention slope is inclined toward the outside of the outer water tank in a direction away from the inner water tank to guide the slag to fall to the outer area of ​​the outer water tank, thereby preventing the slag from entering the inner water tank and causing blockage or abnormal water level.

[0010] In some embodiments, the top of the slag-prevention slope is detachably lined with a wear-resistant liner.

[0011] In some embodiments, two wear-resistant liners are arranged opposite each other and inclined to form a V-shaped guide groove, which extends along the inclined direction of the slope.

[0012] In some embodiments, the main water source is a slag cooling water pipeline, and the backup water source is an industrial water supply pipe for the boiler's lower water seal.

[0013] In some embodiments, the alarm is an audible and visual alarm. In some embodiments, the alarm is a soft light sign of a DCS.

[0014] In some embodiments, the bottom of the outer water tank and the inner water tank are provided with a plurality of sludge collection tanks arranged in a ring around the drain gate, and the sludge collection tanks are inclined to guide the sediment to move toward the drain gate.

[0015] In some embodiments, the bottom of the sludge collection trough is inclined at an angle of 15°-20°, and the lowest end of the sludge collection trough is connected to the inlet of the water discharge gate.

[0016] This application offers the following advantages: A pressure transmitter positioned within the sealed cavity monitors the water seal's sealing status and provides dual early warning with the water level sensor, predicting the risk of water seal breakdown and ensuring more reliable and timely warnings. The slag-prevention slope slopes towards the outer water tank, using gravity to guide slag and prevent it from entering the inner water tank, avoiding overflow blockage and ensuring the stability of the main seal. Wear-resistant liners isolate the slag from impact and abrasion by high-temperature slag; after wear, they can be replaced individually without modifying the water tank itself, reducing maintenance costs. Two wear-resistant liners form a V-shaped guide channel extending along the slope, collecting slag and guiding it to a designated area, preventing slag from lateral accumulation and rolling. The slag cooling water pipeline and backup water source are drawn from the industrial water in the boiler's lower water seal, reducing modification costs and providing dual water source backup to solve the problem of water seal failure caused by a single water source interruption. An inclined sludge collection trough arranged in a ring around the drain valve uses gravity to guide sediment towards the drain valve, reducing the dredging area and lowering the risk of dredging operations. The bottom of the sludge collection trough is inclined at an angle of 15°-20° to ensure smooth sludge discharge and form a sludge discharge channel, solving the problem of incomplete sludge removal caused by traditional flat-bottomed water tanks. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the double-layer sealing water tank device on the bottom of the furnace of a thermal power unit according to an embodiment of the present invention.

[0018] Attached reference numerals: 1. Inner water tank; 2. Outer water tank; 3. Upper water seal baffle; 4. First overflow outlet; 5. Second overflow outlet; 6. Slag prevention slope; 7. Water discharge gate; 8. Water level sensor; 9. Pressure transmitter; 10. Main water source; 11. Industrial water supply pipe; 12. Emergency water supply. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] An embodiment of the present invention provides a double-layer sealing water tank device for the furnace bottom of a thermal power unit, comprising an inner water tank 1, an outer water tank 2, and an early warning mechanism. The inner water tank 1 is used to accommodate the upper water seal baffle 3 to isolate the inside and outside of the furnace and maintain a seal. A first overflow port 4 is provided on the edge of the inner water tank 1, and the first overflow port 4 is connected to the outer water tank 2. A second overflow port 5 is provided on the edge of the outer water tank 2, and the height of the second overflow port 5 is lower than the height of the first overflow port 4 to adjust the liquid level of the outer water tank 2. The liquid level in the outer water tank 2 is lower than that in the inner water tank 1. A slag-proof slope 6 is installed on the top of the outer water tank 2. Both the outer water tank 2 and the inner water tank 1 are equipped with drain gates 7. The drain gate 7 of the inner water tank 1 passes through the outer water tank 2 through a pipeline. The main water source replenishes water to the inner water tank 1. The backup water source is connected to the inner water tank 1. The early warning mechanism includes an alarm and a water level sensor arranged in the outer water tank 2. The water level sensor is used to monitor the liquid level in the outer water tank 2. The alarm is electrically connected to the water level sensor.

[0021] The inner water tank 1 accommodates the boiler's original upper water seal baffle 3, forming a primary liquid seal to isolate the inside and outside of the furnace. This eliminates the need to modify the original baffle structure, reducing modification costs and construction difficulty. A first overflow port 4 is installed on the upper side wall of the inner water tank 1 to divert excess water into the outer water tank 2, ensuring the inner water tank 1 remains full and maintaining the liquid level seal height. A second overflow port 5, lower than the first overflow port 4, is installed on the upper side wall of the outer water tank 2, creating a fixed water level difference between the inner and outer layers. This allows the outer water tank 2 to act as a secondary buffer seal, maintaining an effective seal even if the outer water level fluctuates, preventing water seal breakdown caused by water shortage in a single water tank. A slag-prevention slope 6 is installed at the top of the outer water tank 2 to guide slag falling from the furnace to the outer area of ​​the outer water tank 2, minimizing the risk of slag entering the inner water tank 1 and causing overflow port blockage or abnormal water level, ensuring a stable inner seal. The inner water tank 1 and the outer water tank 2 are each equipped with an independent drain valve 7 at their bottom, allowing independent control of the liquid level in both tanks. The inner drain valve 7 extends to the outside via a pipe passing through the outer water tank 2, enabling independent emptying of both tanks. This eliminates the need for overall drainage during maintenance, shortening maintenance and drainage time. The main water source and backup water source are simultaneously connected to the inner water tank 1, forming a dual-source backup water supply system. This prevents water seal failure due to a single water source interruption, ensuring reliable operation under extreme conditions. An alarm mechanism is installed in the outer water tank 2, connected to a water level sensor. The sensor monitors the liquid level in the outer water tank 2 in real time. When the level falls below a set value, the alarm is triggered, providing early warning of insufficient water supply or system leaks, shifting from reactive repair to proactive prevention and reducing the probability of accidents. The alarm also alerts staff to timely maintenance and handling.

[0022] In some embodiments, the warning mechanism further includes a pressure transmitter disposed within the cavity of the outer water tank for monitoring pressure, and the pressure transmitter is electrically connected to the alarm.

[0023] Specifically, the pressure transmitter is positioned within the cavity of the outer water tank 2. The measuring rod of the pressure transmitter is located on a horizontal plane slightly above the centerline of the overflow hole of the inner water tank 1. The position of the measuring rod near the overflow hole prevents it from being splashed or submerged by overflowing water from the inner water tank 1, ensuring that the detected pressure is atmospheric pressure. Furthermore, the position of the measuring rod allows for the detection of air pressure changes when the water seal of either the inner or outer water tank 2 is breached. Pressure changes are linearly correlated with the water seal's sealing status. Compared to indirect early warning methods that rely on water level monitoring, the pressure transmitter can capture the abnormal increase in negative pressure at the initial stage of water seal rupture, enabling prediction of water seal failure. This forms a dual early warning system with the water level sensor. The water level sensor warns of early anomalies such as insufficient water replenishment or system leaks, while the pressure transmitter warns of critical risks when the water seal is about to rupture or has already ruptured. Both systems cover different fault stages, improving the reliability and timeliness of the early warning. The pressure transmitter is electrically connected to an alarm. When the detected pressure exceeds a set threshold, the alarm is triggered, issuing a warning signal to remind operators to take timely intervention measures to prevent the accident from escalating. The pressure can be set to around -30Pa for alarm. Once the threshold is reached, an alarm will be issued indicating that the upper water seal has failed. Water should be added and the system should be inspected.

[0024] Optionally, the pressure transmitter can be linked with the water supply control system. When the negative pressure rises slightly abnormally, the water supply flow rate can be increased to quickly restore the water seal without manual intervention.

[0025] In some embodiments, the slope of the slag-prevention slope 6 is inclined toward the outside of the outer water tank 2 in a direction away from the inner water tank 1 to guide the slag to fall to the outer area of ​​the outer water tank 2, so as to avoid the slag entering the inner water tank 1 and causing blockage or abnormal water level.

[0026] Specifically, the slag-prevention slope 6 slopes outward from the outer water tank 2, away from the inner water tank 1. Utilizing gravity, it alters the trajectory of falling slag from the furnace, guiding it to the ground or slag-receiving area outside the outer water tank 2. This blocks the possibility of slag entering the inner water tank 1, preventing slag deposition that could clog the inner overflow outlet, wear the tank body, or cause abnormal fluctuations in the inner water level. This ensures the long-term stable operation of the inner main seal, reduces the amount of slag entering the outer water tank 2, and lowers the frequency of sludge removal and maintenance workload. The slope of the slag-prevention slope 6 guides the movement of the slag while simultaneously reducing its weight and deflecting the impact of the slag.

[0027] In some embodiments, the top of the slag slope 6 is detachably provided with a wear-resistant liner.

[0028] Specifically, the detachable installation of the wear-resistant liner addresses the need for complete replacement of the entire water tank after the slag-prevention slope 6 is subjected to long-term high-temperature slag impact and high-speed erosion. The wear-resistant liner is made of a high-hardness, wear-resistant material, which extends the service life of the slag-prevention working surface and reduces replacement frequency compared to ordinary steel plates. When the liner wears to the failure threshold, it can be disassembled and replaced individually without altering the water tank's structure. This reduces construction difficulty and maintenance costs, and avoids damage to the water tank's sealing performance caused by overall cutting and welding. The wear-resistant liner can be fixed to the top of the slag-prevention slope 6 with bolts.

[0029] Optionally, wear indicator grooves with a depth consistent with the allowable wear amount are pre-fabricated on the surface of the wear-resistant liner. When the liner wears to the bottom of the indicator groove, it indicates that it should be replaced, thus preventing damage to the substrate of the slag-prevention slope 6 below after the liner is worn through. Multiple guide ridges extending in an inclined direction are set on the surface of the wear-resistant liner. The kinetic energy of the falling slag is used to drive the fine slag particles remaining on the surface to slide off, achieving self-cleaning of the liner surface and preventing slag particles from accumulating and forming a platform that affects the guiding effect.

[0030] In some embodiments, two wear-resistant liners are arranged opposite each other and inclined to form a V-shaped guide groove, which extends along the inclined direction of the slope.

[0031] Specifically, two wear-resistant liners are arranged opposite each other and inclined to form a V-shaped guide channel extending along the inclined direction of the slope. The convergence and guidance of the V-shaped channel allows the slag to slide orderly along the guide channel to the designated area outside the outer water tank 2, avoiding the slag from spreading and accumulating laterally on the surface of the slag-proof slope 6 to form a platform. This eliminates the risk of the slag rolling back into the inner water tank 1 after accumulation. The V-shaped channel structure can also concentrate the impact load of the slag on the wear-resistant working surface of the liner, protecting the liner joints and the base of the slag-proof slope 6 from direct wear, and extending the service life of the overall structure.

[0032] In some embodiments, the main water source 10 is a slag cooling water pipeline, and the backup water source is the industrial water supply pipe 11 of the boiler bottom water seal.

[0033] Specifically, the main water source utilizes the existing slag cooling water pipeline in the power plant. The quality and pressure of the slag cooling water meet the operational requirements of the water seal system, reducing the cost of the renovation project, enabling on-site recycling of water resources, reducing fresh water consumption, and minimizing the temperature difference between the slag cooling water and the furnace environment. This prevents thermal stress deformation of the water tank wall due to excessively low makeup water temperature. The backup water source is drawn from the industrial water makeup system of the boiler's lower water seal, utilizing the existing industrial water network and lower water seal makeup facilities within the plant area. This eliminates the need for constructing long-distance water supply pipelines and forms a dual-source redundancy backup with the slag cooling water, preventing water seal failure due to interruption of a single water source or abnormal water quality. Optionally, an emergency water source 12 is also included. This emergency water source serves as a fire-fighting emergency interface and can be used as temporary emergency makeup water or as a backwash water source for the slag cooling water makeup system.

[0034] In some embodiments, the alarm is an audible and visual alarm.

[0035] Specifically, the alarm system employs both audible and visual signals, simultaneously emitting sound and light signals to adapt to the noisy operating environment of power plants. By transmitting alarm information through both auditory and visual channels, it avoids missed alarms caused by environmental noise masking a single signal or obstruction of the inspector's view, thus improving the identification and coverage of alarm information. The audible and visual alarm system can be set with different alarm tones and light colors to correspond to different levels of fault warnings. For example, a low water level warning uses a yellow light and a low-frequency alarm sound, while a negative pressure abnormality warning uses a red light and a high-frequency alarm sound, helping operators determine the type of fault and shorten response time.

[0036] In some embodiments, the alarm in the DCS (Distributed Control System) is a soft light display. After the signals from the level sensor and pressure transmitter are transmitted to the DCS in the central control room, an alarm is triggered via the soft light display when the data exceeds the threshold. Operators monitor the alarm and handle it promptly. The soft light display can show detailed information such as alarm name, measuring point number, alarm value, occurrence time, and alarm level. Displaying warnings through a virtual alarm display unit is low-cost, provides a large amount of information, and is easy to modify and control. Virtual devices require no hardware investment, offer rich alarm information for easy later traceability, and are simple to maintain.

[0037] In some embodiments, an overflow baffle is provided at the first overflow port 4, and the overflow baffle is slidably connected to the outer wall of the inner water tank 1 to change the position of the overflow baffle.

[0038] Specifically, by changing the vertical position of the overflow baffle, the effective overflow height of the first overflow port 4 can be adjusted slightly, thereby controlling the water level difference between the inner and outer water tanks 2. This eliminates the need for cutting and welding modifications to the water tank body, avoiding damage to its sealing performance and structural strength. The sealing water level can be adjusted according to different boiler loads, seasonal temperature changes, and equipment sealing requirements. The first overflow port 4 can be a rectangular channel extending along its height. As the overflow baffle rises and falls, the overflow position of the first overflow port 4 changes. The overflow baffle, positioned in the inner water tank 1, acts as a barrier. When the outer water tank is damaged, especially at the bottom causing a low water level, the furnace interior and exterior are connected through the outer water tank and the first overflow port 4. Adjusting the overflow baffle to close the first overflow port 4 isolates the furnace interior and exterior. Under high load and high evaporation conditions, the overflow height is increased to increase the sealing margin; under low load and low evaporation conditions, the overflow height is decreased to reduce water consumption. In the event of a temporary malfunction in the water replenishment system, the overflow baffle can be slid upwards to raise the water level in the inner water tank 1, providing a longer buffer time for troubleshooting. Furthermore, it is understood that the overflow port of the outer water tank is lower than the first overflow port 4 of the inner water tank and higher than the lowest point of the water seal baffle of the inner water tank. When the inner water tank is damaged, the water level in the inner water tank 1 is equal to the water level in the outer water tank 2, allowing the outer water tank 2 to ensure the normal operation of the boiler's upper water seal.

[0039] In some embodiments, the bottom of the outer water tank 2 and the inner water tank 1 is provided with a plurality of sludge collection tanks arranged in a ring around the drain gate 7. The sludge collection tanks are inclined to guide the sediment to move toward the drain gate 7.

[0040] Specifically, the bottom of both the outer water tank 2 and the inner water tank 1 is equipped with several sludge collection troughs arranged in a ring around the drain gate 7. The number of sludge collection troughs can be one, two, or more. The sludge collection troughs are inclined towards the drain gate 7, using gravity to guide the slag particles, scale debris, and other impurities deposited in the water tanks towards the inlet of the drain gate 7. This prevents large-scale sediment deposition at the bottom of the water tanks, avoids raising the effective water level due to sediment buildup, which could affect the water seal accuracy, and reduces the coverage area for dredging operations. When the water tanks are drained, the sediment is discharged with the water flow, eliminating the need for manual cleaning, reducing the operational risks for maintenance personnel, shortening downtime for dredging, and improving equipment availability.

[0041] Optionally, a ceramic coating can be laid at the bottom of the sludge collection tank to resist long-term erosion and water corrosion by sediment, thus extending the service life of the sludge collection tank.

[0042] In some embodiments, the bottom of the mud collection trough is inclined at an angle of 15°-20°, and the lowest end of the mud collection trough is connected to the inlet of the water discharge gate 7.

[0043] Specifically, the bottom inclination angle of the sludge collection tank is set to 15 to 20 degrees to ensure that various sediments can slide smoothly and continuously towards the drain gate 7 under the action of gravity, without sedimentation or caking, and without the water storage volume at the bottom of the tank being too small due to an excessively large angle, thus avoiding long-term sediment accumulation and corrosion of the tank body due to an excessively small angle. The lowest end of the sludge collection tank is directly connected to the inlet of the drain gate 7, forming an unobstructed sludge discharge channel. When water is discharged, the sediments that have gathered in the sludge collection tank can be directly discharged through the drain gate 7 with the water flow, without any dead corners, solving the problems of incomplete sludge removal in flat-bottomed tanks and sediment raising the effective water level, which affects the sealing accuracy.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A double-layer sealing water tank device for the bottom of a thermal power unit furnace, characterized in that, include: The system comprises an inner water tank, an outer water tank, and an early warning mechanism. The inner water tank houses a water seal baffle to maintain a seal between the inside and outside of the furnace. A first overflow port is located along the edge of the inner water tank and is connected to the outer water tank. A second overflow port is located along the edge of the outer water tank, with the height of the second overflow port lower than that of the first overflow port to ensure that the liquid level in the outer water tank is lower than that in the inner water tank. A slag-prevention slope is provided at the top of the outer water tank. Both the outer and inner water tanks have drain valves at their bottoms. The drain valve of the inner water tank passes through the outer water tank via a pipe. A main water source supplies water to the inner water tank, and a backup water source is connected to the inner water tank. The early warning mechanism includes an alarm and a water level sensor located in the outer water tank. The water level sensor monitors the liquid level in the outer water tank, and the alarm is electrically connected to the water level sensor.

2. The double-layer sealing water tank device for the furnace bottom of a thermal power unit according to claim 1, characterized in that, The early warning mechanism also includes a pressure transmitter, which is arranged in the cavity of the outer water tank to monitor the pressure, and the pressure transmitter is electrically connected to the alarm.

3. The double-layer sealing water tank device for the furnace bottom of a thermal power unit according to claim 1, characterized in that, The slope of the slag-prevention slope is inclined toward the outside of the outer water tank in a direction away from the inner water tank to guide the slag to fall to the outer area of ​​the outer water tank, thereby preventing the slag from entering the inner water tank and causing blockage or abnormal water level.

4. The double-layer sealing water tank device for the furnace bottom of a thermal power unit according to claim 3, characterized in that, The top of the slag-prevention slope is detachably lined with a wear-resistant liner.

5. The double-layer sealing water tank device for the furnace bottom of a thermal power unit according to claim 4, characterized in that, Two wear-resistant liners are arranged opposite each other and inclined to form a V-shaped guide groove, which extends along the inclined direction of the inclined surface.

6. The double-layer sealing water tank device for the furnace bottom of a thermal power unit according to claim 1, characterized in that, The main water source is the slag cooling water pipeline, and the backup water source is the industrial water supply pipeline of the boiler bottom water seal.

7. The double-layer sealing water tank device for the furnace bottom of a thermal power unit according to claim 1, characterized in that, The alarm is an audible and visual alarm.

8. The double-layer sealing water tank device for the furnace bottom of a thermal power unit according to claim 1, characterized in that, The alarm device is a DCS soft light sign.

9. The double-layer sealing water tank device for the furnace bottom of a thermal power unit according to claim 1, characterized in that, The bottom of the outer water tank and the inner water tank are provided with several mud collection tanks arranged in a ring around the water outlet gate. The mud collection tanks are inclined to guide the sediment to move toward the water outlet gate.

10. The double-layer sealing water tank device for the furnace bottom of a thermal power unit according to claim 1, characterized in that, The bottom of the sludge collection trough has an inclination angle of 15°-20°, and the lowest end of the sludge collection trough is connected to the inlet of the water discharge gate.

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