Steam drum water level monitoring and alarming device in boiler boiling period

Abstract

The invention discloses a steam drum water level monitoring and alarming device during boiler boiling, and relates to the technical field of steam drum water level monitoring. The system comprises a transverse steam drum water tank, wherein two groups of water level monitoring units and two groups of in-tank environment analysis units are mounted at the top of the steam drum water tank; the water level monitoring unit comprises a buoy, a suspension block, a water level measuring barrel rod, a sealing sleeve head and a laser ranging probe; the in-tank environment analysis unit comprises a detection plate, a rotating rod, a driving assembly and a monitoring control box; and a monitoring analysis server and an alarm module are arranged in the monitoring equipment. Through the novel water level monitoring structure, the water level can be accurately monitored without being affected by the environment in the tank body, the environment in the tank can be analyzed through the tank environment analysis unit, and the problems that existing steam drum water tank water level monitoring is prone to being affected by the environment, so that the monitoring precision is low, and the monitoring cost is low are solved. And other environmental condition data except the water level in the tank cannot be monitored.

Description

Technical Field

[0001] The invention belongs to the technical field of drum water level monitoring, and in particular relates to a drum water level monitoring and alarm device during boiler boiling. Background Art

[0002] Prior art typically relies on a single, on-site, two-color water level gauge (red for steam, green for water) and a camera for manual monitoring during boiler commissioning. This presents the following drawbacks: 1. Poor image quality: The monitoring screen is easily affected by steam and light interference, resulting in image blur and lag, making it easy for operators to misjudge the water level; 2. Alarm lag: Traditional sensors (such as float-type sensors) are prone to failure in high-temperature and high-pressure environments and lack dynamic threshold adjustment capabilities; 3. The system is isolated and not linked to remote terminals, making real-time alarms and rapid responses impossible. These issues can easily lead to accidents such as drum flooding (chemical corrosion of the superheater) or dry boiler (dry boiler). Existing water level monitoring systems are susceptible to environmental influences within the tank, resulting in low accuracy. They also fail to monitor the tank's environmental conditions, including water concentration (density), bubble layer thickness, and steam layer pressure.

[0003] To this end, we provide a drum water level monitoring and alarm device during boiler boiling to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a boiler water level monitoring and alarm device during boiler boiling. Through a new water level monitoring structure, the water level can be accurately monitored without being affected by the environment inside the tank. The tank environment analysis unit can also be used to analyze the tank environment, thereby solving the problems that the water level monitoring in the existing boiler water tank is easily affected by the environment, resulting in low monitoring accuracy and inability to monitor other environmental conditions data in the tank except the water level.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a boiler water level monitoring and alarm device during boiler boiling, comprising a horizontally placed boiler water tank, two groups of water level monitoring units and two groups of tank internal environment analysis units are installed on the top of the boiler water tank, a monitoring platform is provided on the outer wall of the boiler water tank, and a monitoring device is installed on the monitoring platform; the water level monitoring unit comprises a float, a suspension block, a water level measuring rod, a sealing sleeve and a laser ranging probe, a limiting bottom plate is provided at the bottom of the water level measuring rod, the float is movably sleeved on the water level measuring rod, the suspension block is movably inserted into the inside of the water level measuring rod, a first magnet array is installed in the float, a second magnet array is installed in the suspension block, the first magnet array can push the second magnet array upward, a downward-facing laser ranging probe is installed in the sealing sleeve, and the sealing sleeve is sealed on the top of the water level measuring rod.

[0006] The tank environment analysis unit includes a detection plate, a rotating rod, a driving assembly and a monitoring control box. The rotating rod is provided with mounting rods that are evenly spaced and staggered left and right. The rotating rod and the mounting rod are provided with hollow structures inside and are interconnected. Each of the mounting rods is sleeved with a detection plate. The top of the rotating rod passes through the driving assembly and the driving assembly drives the rotating rod to rotate. The top of the rotating rod is fixed with a monitoring control box. A monitoring and analysis server and an alarm module are provided in the monitoring device. The laser ranging probe and the driving assembly are electrically connected to the monitoring and analysis server. The monitoring control box is wirelessly connected to the monitoring and analysis server. The alarm module is used to alarm when the monitoring data is abnormal. The monitoring and analysis server is connected to the background center through a network.

[0007] The present invention is further configured as follows: the float includes a float frame and a float block, the float frame is cylindrical, three circles of float block holes are provided on the side wall of the float frame, the float block is provided with an inclined magnet socket, a first magnet is inserted in the magnet socket, the first magnet forms a first magnet array with three circles of arrays, the inner side surface of the first magnet forms an angle of 45-60° with the horizontal plane and is tilted upward; the suspension block includes a circular plate and a connecting column, the three layers of the circular plates are connected by connecting columns, the second layer of the circular plate and the bottommost circular plate are inserted with an inclined second magnet around the upper edge, the second magnet forms a second magnet array with two circles of arrays, the outer side surface of the second magnet forms an angle of 45-60° with the horizontal plane and is tilted downward, a plurality of semicircular notches are provided around the side wall of the circular plate; the inner side surface of the first magnet and the outer side surface of the second magnet repel each other.

[0008] The present invention is further configured such that when the buoy is floating on the water at rest, 1 / 5-1 / 3 of the buoy segment will float on the water surface, and when the suspended block is suspended at rest, the distance between the upper surface of the circular plate of the top layer of the suspended block and the top of the buoy is a constant value.

[0009] The present invention is further configured such that the detection plate includes a sealing sleeve, a sensor plate, and a plurality of sensors. Two sensor plates are fixed to the sealing sleeve, symmetrical in both directions. Both sensor plates are provided with a pressure sensor and a temperature sensor. When the sensor plates are driven to rotate by a rotating rod, the pressure sensors on the sensor plates generate different pressure values ​​when they come into contact with water, foam, and steam layer air. The sensor heads are sealed with a sealing membrane.

[0010] The pressure value detected in the water increases as the density of the water increases. Therefore, the density of the water can be calculated by the pressure value, and the height of the buoy floating on the water surface can be calculated by the density of the water.

[0011] The present invention is further configured as follows: the drive assembly includes a cylindrical mounting box, a motor mounting plate, a servo motor and a driving gear plate, a flange is provided at the top opening position of the cylindrical mounting box, a mounting circular hole is provided at the bottom of the cylindrical mounting box, a mounting cylinder is provided at the top of the rotating rod, the outer wall of the top wall of the mounting cylinder is provided with a circle of gear belt, the top of the mounting cylinder is inserted into the cylindrical mounting box from the mounting circular hole, and a mechanical seal is provided at the inside and lower external position of the cylindrical mounting box, the mounting cylinder is provided with a bearing under the gear belt and the bearing is embedded in the cylindrical mounting box, a motor mounting plate is fixed on the flange, a downward servo motor is mounted on the motor mounting plate, a driving gear plate is provided on the rotating shaft of the servo motor, the driving gear plate is meshed with the gear belt, the monitoring control box is fixedly mounted on the top of the mounting cylinder, and the servo motor is electrically connected to the monitoring and analysis server.

[0012] The present invention is further configured such that the servo motor is started to work once by the monitoring and analysis server at a certain interval, and each working time is 3-5 seconds. Each time the servo motor works, the data collected by the pressure sensor during the working time period of the servo motor will be recorded. The pressure sensor collects data every 0.1 seconds, and all data during the non-uniform speed time period of the servo motor during the start and stop process will be discarded; a battery, a data acquisition chip and a wireless module are provided in the monitoring and control box, all sensors are electrically connected to the data acquisition chip, the battery supplies power to the data acquisition chip, and the wireless module is installed on the data acquisition chip and is used to send data and receive signals.

[0013] The present invention is further configured such that a database is provided in the monitoring and analysis server, in which different pressure value data corresponding to different environmental data in the drum water tank are stored; an environmental architecture model is provided in the monitoring and analysis server, in which the pressure value monitored by the pressure sensor corresponds to the environmental data in the drum water tank, and these environmental data are structured on the environmental architecture model to construct an environmental map inside the drum water tank.

[0014] The present invention is further configured such that the two groups of water level monitoring units and the two groups of tank environment analysis units compare the two groups of collected data. If there are large errors in the monitoring data of the two groups of water level monitoring units or / and the monitoring data of the two groups of tank environment analysis units, but neither exceeds the environmental alarm limit in the drum water tank, an alarm reminder will also be activated.

[0015] The present invention is further configured to use one monitoring device to centrally control the water level monitoring units and tank environment analysis units installed on the top of multiple boiler water tanks arranged side by side, but each water level monitoring unit and tank environment analysis unit installed on the top of the boiler water tank are numbered to distinguish them.

[0016] The present invention has the following beneficial effects: 1. The present invention adopts a novel structure for measuring the water level in the tank. The buoy floats in the tank to determine the height of the buoy. The suspended block is subjected to the upward thrust of the buoy and is suspended to a fixed height position above the buoy. The laser ranging probe can accurately measure the distance between the top of the suspended block and the laser ranging probe, thereby determining the water level of the buoy floating in the water. Since the waves and steam in the tank have little effect on the buoy, and the suspended block is in the water level measuring rod and is not affected by the environment in the tank, higher water level data can be obtained, and the laser ranging probe will not be affected by the environment in the tank, resulting in reduced monitoring accuracy.

[0017] 2. The present invention uses the tank environment analysis unit to detect the temperature at different heights in the tank and the data monitored by the mobile downward pressure sensor to analyze the environment in the tank, including data such as water concentration (density), bubble layer thickness and viscosity, and steam concentration of the steam layer, to construct a tank environment map, which can clearly judge the situation in the tank and quickly understand the situation in the tank when an alarm is sounded.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 The diagram is a structural diagram of a drum water level monitoring and alarm device during boiler boiling.

[0021] Figure 2 The diagram is a schematic diagram of the explosion structure of a drum water level monitoring and alarm device during boiler boiling.

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the water level monitoring unit and the tank environment analysis unit.

[0023] Figure 4 This is an enlarged schematic diagram of the lower half of the cross-sectional structure of the water level monitoring unit.

[0024] Figure 5 Schematic diagram of the structure of the pontoon frame.

[0025] Figure 6 Schematic diagram of the structure of the rotating rod.

[0026] Figure 7 Schematic diagram of the structure of the suspension block.

[0027] Figure 8 Schematic diagram of the detection board.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 1. Drum water tank; 11. Monitoring station; 2. Water level monitoring unit; 21. Sealing sleeve; 22. Laser ranging probe; 23. Water level measuring rod; 231. Limiting bottom plate; 3. Tank environment analysis unit; 31. Cylindrical mounting box; 32. Motor mounting plate; 33. Servo motor; 331. Drive gear plate; 34. Monitoring control box; 35. Bearing; 36. Mechanical seal; 4. Suspension block; 41. Circular plate; 411. Semicircular notch; 42. Connecting column; 43. Second magnet; 5. Float; 51. Float frame; 511. Float block hole; 52. Float; 53. First magnet; 6. Rotating rod; 61. Mounting support rod; 62. Mounting column; 621. Gear belt; 7. Detection plate; 71. Sealing sleeve; 72. Sensor plate; 73. Pressure sensor; 74. Temperature sensor. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] See also Figure 1-8 The present invention provides a drum water level monitoring and alarm device during boiler boiling. The device comprises a horizontally mounted drum water tank 1, with two sets of water level monitoring units 2 and two sets of internal tank environment analysis units 3 mounted on top. A monitoring platform 11 is provided on the outer wall of the drum water tank 1, on which monitoring equipment is mounted. The two sets of monitoring units are provided to prevent damage or abnormality in one set, making it impossible to monitor. The water inlet pipe, outlet pipe, and pressure relief valve on the drum water tank 1 are not shown, as they are conventional structures and are not within the scope of protection, and are therefore not shown.

[0032] The water level monitoring unit 2 includes a float 5, a suspension block 4, a water level measuring rod 23 (a high-temperature resistant plastic tube that does not affect the mutual repulsion of magnets), a sealing sleeve 21 and a laser ranging probe 22. A limiting bottom plate 231 is provided at the bottom of the water level measuring rod 23. The float 5 is movably sleeved on the water level measuring rod 23. The suspension block 4 is movably inserted into the water level measuring rod 23. A first magnet 53 array is installed in the float 5, and a second magnet 43 array is installed in the suspension block 4. The first magnet 53 array can push the second magnet 43 array upward. A downward-facing laser ranging probe 22 is installed in the sealing sleeve 21. The sealing sleeve 21 is sealed on the top of the water level measuring rod 23; a first flange 211 is provided on the top of the sealing sleeve 21 for installation. When the sealing sleeve 21 is sleeved on the water level measuring rod 23, some glue is used to seal the gap. When disassembling it later, the glue can be scraped off with a knife.

[0033] Traditionally, two-color water level gauges (red for gas and green for water) and cameras are used for manual monitoring, which is troublesome and easily affected by the environment. Since more than half of the float 5 is in the water and is placed outside the water level measuring tube rod 23, it hardly shakes and is not affected by bubbles, causing it to float up and down. It only moves up and down with changes in the water level. The repulsive force between the first magnet 53 array and the second magnet 43 array is constant, so the floating height of the suspended block 4 and the distance between the float 5 are constant. The position of the float 5 is determined by detecting the top position of the suspended block 4 with the laser ranging probe 22, and the water level can be accurately determined.

[0034] The tank environment analysis unit 3 includes a detection plate 7, a rotating rod 6, a drive assembly and a monitoring control box 34. The rotating rod 6 has mounting rods 61 that are evenly spaced and staggered on the left and right. The rotating rod 6 and the mounting rods 61 are provided with a hollow structure inside and are connected to each other. Each of the mounting rods 61 is sleeved with a detection plate 7. The top of the rotating rod 6 is installed in the drive assembly and the drive assembly drives the rotating rod 6 to rotate. The monitoring control box 34 is fixed to the top of the rotating rod 6.

[0035] The detection plate 7 can detect the environment inside the tank while rotating, including the concentration of impurities in the water (such as dissolved alkaline substances), the viscosity of the solution, the increase in density, etc. Moreover, the more impurities in the water, the easier it is to foam, and the foam will float on the water surface, affecting the water level monitoring. The rotating detection plate 7 can measure the water resistance, bubble resistance and steam layer resistance to analyze the environment inside the tank.

[0036] The monitoring device is equipped with a monitoring and analysis server and an alarm module. The laser ranging probe 22 and the drive assembly are electrically connected to the monitoring and analysis server. The monitoring control box 34 is wirelessly connected to the monitoring and analysis server. The alarm module is used to alarm when the monitoring data is abnormal. The monitoring and analysis server is connected to the backend center through a network. The alarm in the monitoring device includes a combination of a flashing light and a horn.

[0037] Monitoring data is used to determine if there are any abnormalities within the tank and to determine whether to trigger an alarm. Because the monitoring control box 34 is connected to the detection board 7 via a data cable, it cannot be driven by the sensor and must be integrated with the rotating rod 6. Here, the monitoring control box 34 collects and receives information wirelessly via a monitoring and analysis server. The monitoring and analysis server periodically transmits data to the backend, and immediately sends a message if an abnormality occurs.

[0038] The float 5 includes a float frame 51 and a float block 52. The float frame 51 is cylindrical, and three circles of float block holes 511 are provided on the side wall of the float frame 51. The float block 52 is provided with an inclined magnet insertion hole, and a first magnet 53 is inserted into the magnet insertion hole. The first magnet 53 forms a three-circle array of the first magnet 53. The inner side of the first magnet 53 forms an angle of 45-60 degrees with the horizontal plane and is tilted upward.

[0039] Three layers of floating blocks 52 are set to ensure upward thrust. The inclined setting can generate oblique thrust in the water level measuring cylinder rod 23. Since the floating cylinder frame 51 is outside, it is necessary to reduce the floating block holes 511, so four floating block holes 511 are set in a circle. If the angle is too large, the thrust on the suspended block 4 will be large, but the upward thrust will become smaller. As the angle becomes smaller, the thrust on the suspended block 4 will become smaller, and it will be impossible to push upward.

[0040] The suspension block 4 includes a circular plate 41 and a connecting column 42. The circular plates 41 are connected to each other by the connecting column 42 in three layers. The upper edges of the second and bottom circular plates 41 are provided with inclined second magnets 43. The second magnets 43 form a two-circle array of second magnets 43. The outer sides of the second magnets 43 form an angle of 45-60 degrees with the horizontal plane and are tilted downward. The side walls of the circular plates 41 are provided with a plurality of semicircular notches 411.

[0041] The inner side of the first magnet 53 and the outer side of the second magnet 43 repel each other. The first magnet 53 and the second magnet 43 are parallel, and the thrust is the largest.

[0042] Here, the second magnets 43 are arranged in a circle in greater numbers to ensure that the suspension block 4 is subjected to the upward thrust of the first magnets 53 when it rotates, so that the force is evenly distributed and the suspension block 4 is not prone to spinning.

[0043] When the buoy 5 is stationary and floating on the water, a 1 / 5-1 / 3 section of the buoy 5 will float on the water surface. When the suspended block 4 is suspended and stationary, the distance between the upper surface of the topmost circular plate 41 of the suspended block 4 and the top of the buoy 5 is constant. Because the density of magnets is greater than that of water, the buoy 5 is made of high-temperature resistant foam. After the floating block 52 is inserted into the floating block hole 511 of the buoy frame 51, it is tied with a rope to prevent the floating block 52 from falling out.

[0044] The detection plate 7 includes a sealing sleeve 71, a sensor plate 72 and a plurality of sensors. Two upper and lower symmetrical sensor plates 72 are fixed on the sealing sleeve 71. Both sensor plates 72 are provided with a pressure sensor 73 and a temperature sensor 74. When the sensor plate 72 is driven to rotate by the rotating rod 6, the pressure sensor 73 on the sensor plate 72 generates different pressure values ​​when it comes into contact with water, foam and steam layer air. The sensor head is sealed with a sealing film. After cleaning the tank, all sensors can be zeroed once.

[0045] The pressure value detected in the water increases as the density of the water increases. Therefore, the density of the water can be calculated by the pressure value, and the height of the buoy 5 floating on the water surface can be calculated by the density of the water.

[0046] At a constant speed, the greater the impact force on the surface of sensor plate 72, the greater the surface density. For example, if water has a high density (or high viscosity), the impact force on the surface of sensor plate 72 will be greater at the same speed. When pressure is applied to pressure sensor 73 (a strain gauge sensor), the pressure value is related to the water density, the concentration and size of bubbles, and the steam concentration, reflecting the environmental conditions within the tank. The sealing membrane is a high-temperature resistant polytetrafluoroethylene (PTFE) waterproof membrane.

[0047] The drive assembly includes a cylindrical mounting box 31, a motor mounting plate 32, a servo motor 33 and a driving gear plate 331. A flange is provided at the top opening of the cylindrical mounting box 31, a mounting hole is provided at the bottom of the cylindrical mounting box 31, a mounting column 62 is provided at the top of the rotating rod 6, a gear belt 621 is provided on the outer wall of the top wall of the mounting column 62, the top of the mounting column 62 is inserted into the cylindrical mounting box 31 from the mounting hole, and a mechanical gear is provided inside and outside the cylindrical mounting box 31. The seal 36, the mounting column 62 is provided with a bearing 35 below the gear belt 621 and the bearing 35 is embedded in the cylindrical mounting box 31, the motor mounting plate 32 is fixed on the flange, the motor mounting plate 32 is provided with a downward servo motor 33, the rotating shaft of the servo motor 33 is provided with a driving gear plate 331, the driving gear plate 331 is engaged with the gear belt 621, the monitoring control box 34 is fixedly mounted on the top of the mounting column 62, and the servo motor 33 is electrically connected to the monitoring and analysis server.

[0048] The servo motor 33 is started by the monitoring and analysis server at a certain interval, and each working time is 3-5 seconds. Each time the servo motor 33 works, the data collected by the pressure sensor 73 during the working period of the servo motor 33 is recorded. The pressure sensor 73 collects data every 0.1 seconds, and all data during the non-uniform speed period of the servo motor during the start and stop process are discarded.

[0049] The monitoring control box 34 is equipped with a battery, a data acquisition chip and a wireless module. All sensors are electrically connected to the data acquisition chip. The battery supplies power to the data acquisition chip. The wireless module is installed on the data acquisition chip and is used to send data and receive signals.

[0050] Since the monitoring control box 34 is rotating, it cannot be controlled and powered by wires, and can only be set up to transmit and receive information wirelessly. Since it is only for processing the information collected by the sensor, the data acquisition chip can use some basic chips, such as STM32F103C8T6.

[0051] The monitoring and analysis server is provided with a database, in which different pressure value data corresponding to different environmental data in the drum water tank 1 are stored. The monitoring and analysis server is provided with an environmental architecture model, in which the pressure value monitored by the pressure sensor 73 corresponds to the environmental data in the drum water tank 1, and these environmental data are structured on the environmental architecture model to construct an environmental map of the drum water tank 1.

[0052] Common historical data within the tank is stored in a database. This data corresponds to pressure values ​​(when the pressure sensor is not operating and the tank is empty, the rotational pressure value is calibrated to zero at normal pressure). Under the same rotational conditions, different measured pressure values ​​will represent different environments (liquid, including liquids of varying concentrations; bubble layer, bubble layer thickness and viscosity, etc.; steam layer, steam volume, etc.). After measuring the pressure values, a model is used to construct a diagram of the tank environment for a clearer view of the tank environment (noting the liquid level and water concentration, bubble layer height and concentration, steam volume in the steam layer, etc.).

[0053] The two groups of water level monitoring units 2 and the two groups of tank environment analysis units 3 will compare the two sets of collected data. If there are large errors in the monitoring data of the two groups of water level monitoring units 2 or / and the monitoring data of the two groups of tank environment analysis units 3, but neither exceeds the alarm limit of the environment in the boiler water tank, an alarm reminder will also be activated.

[0054] Data collected from the same tank should not deviate significantly. If significant deviations occur, it may indicate a monitoring error and should be addressed promptly. The two-group design also allows for comparison and comprehensive analysis of data from both groups, even if one group is not functioning properly while the other is still functioning.

[0055] A single monitoring device is used to centrally control the water level monitoring units 2 and tank environment analysis units 3 mounted on top of multiple drum water tanks 1 arranged side by side. Each drum water tank 1 is numbered and distinguished. Centralized control facilitates management and control. When monitoring a specific area, data within each tank must be numbered to distinguish the data within that tank. This numbering allows for quick identification of the status within each tank.

[0056] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0057] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A drum water level monitoring and alarm device during boiler boiling, comprising a horizontally placed drum water tank (1); characterized in that: Two groups of water level monitoring units (2) and two groups of tank internal environment analysis units (3) are installed on the top of the drum water tank (1); a monitoring platform (11) is provided on the outer wall of the drum water tank (1); and monitoring equipment is installed on the monitoring platform (11); The water level monitoring unit (2) comprises a float (5), a suspension block (4), a water level measuring rod (23), a sealing sleeve (21) and a laser distance measuring probe (22); a limiting bottom plate (231) is provided at the bottom of the water level measuring rod (23); the float (5) is movably sleeved on the water level measuring rod (23); the suspension block (4) is movably inserted into the interior of the water level measuring rod (23); a first magnet (53) array is installed in the float (5); a second magnet (43) array is installed in the suspension block (4); the first magnet (53) array can push the second magnet (43) array upward; a downward-facing laser distance measuring probe (22) is installed in the sealing sleeve (21); and the sealing sleeve (21) is sealed on the top of the water level measuring rod (23); The tank environment analysis unit (3) comprises a detection plate (7), a rotating rod (6), a driving assembly and a monitoring control box (34); the rotating rod (6) is provided with mounting rods (61) at equal intervals and staggered on the left and right; the rotating rod (6) and the mounting rods (61) are provided with hollow structures inside and are interconnected; each mounting rod (61) is sleeved with a detection plate (7); the top end of the rotating rod (6) is installed in the driving assembly and the driving assembly drives the rotating rod (6) to rotate; the top end of the rotating rod (6) is fixed with a monitoring control box (34); The monitoring device is provided with a monitoring and analysis server and an alarm module.

2. The drum water level monitoring and alarm device during boiler boiling according to claim 1, characterized in that: The float (5) includes a float frame (51) and a float block (52), the float frame (51) is cylindrical, and three circles of float block holes (511) are provided on the side wall of the float frame (51), and the float block (52) is provided with an inclined magnet insertion hole, and a first magnet (53) is inserted into the magnet insertion hole, and the first magnet (53) forms a first magnet (53) array with three circles, and the inner side surface of the first magnet (53) forms an angle of 45-60 degrees with the horizontal plane and is arranged to be inclined upward; The suspension block (4) comprises a circular plate (41) and a connecting column (42), wherein three layers of the circular plates (41) are connected by the connecting column (42), and an inclined second magnet (43) is inserted around the edge of the upper surface of the second layer of the circular plate (41) and the bottom layer of the circular plate (41), and the second magnet (43) forms a second magnet (43) array with two circles, and the outer side surface of the second magnet (43) forms an angle of 45-60 degrees with the horizontal plane and is tilted downward, and a plurality of semicircular notches (411) are provided around the side wall of the circular plate (41); The inner side surface of the first magnet (53) and the outer side surface of the second magnet (43) repel each other.

3. The drum water level monitoring and alarm device during boiler boiling according to claim 2, characterized in that: When the buoy (5) is stationary and floating on the water, 1 / 5-1 / 3 of the buoy (5) will float on the water surface. When the suspended block (4) is suspended and stationary, the distance between the upper surface of the circular plate (41) at the top layer of the suspended block (4) and the top of the buoy (5) is a constant value.

4. The drum water level monitoring and alarm device during boiler boiling according to claim 3, characterized in that: The detection plate (7) includes a sealing sleeve (71), a sensor plate (72) and a plurality of sensors. Two symmetrical sensor plates (72) are fixed on the sealing sleeve (71). The two sensor plates (72) are both provided with a pressure sensor (73) and a temperature sensor (74). When the sensor plates (72) are driven to rotate by the rotating rod (6), the pressure sensors (73) on the sensor plates (72) generate different pressure values ​​when they come into contact with water, foam and steam layer air. The sensor heads are sealed with a sealing film. The pressure value detected in the water increases as the density of the water increases, and thus the density of the water is calculated by the pressure value, and the height of the buoy (5) floating on the water surface is calculated by the density of the water.

5. The drum water level monitoring and alarm device during boiler boiling according to claim 4, characterized in that: The driving assembly comprises a cylindrical mounting box (31), a motor mounting plate (32), a servo motor (33) and a driving gear plate (331); a flange is provided at the top opening of the cylindrical mounting box (31); a mounting circular hole is provided at the bottom of the cylindrical mounting box (31); a mounting column (62) is provided at the top of the rotating rod (6); a gear belt (621) is provided on the outer wall of the top wall of the mounting column (62); the top of the mounting column (62) is inserted into the cylindrical mounting box (31) through the mounting circular hole, and mechanical seals are provided inside and outside the cylindrical mounting box (31). (36), the mounting column (62) is provided with a bearing (35) below the gear belt (621) and the bearing (35) is embedded in the cylindrical mounting box (31), a motor mounting plate (32) is fixed on the flange, a downward servo motor (33) is mounted on the motor mounting plate (32), a driving gear plate (331) is provided on the rotating shaft of the servo motor (33), the driving gear plate (331) is engaged with the gear belt (621), the monitoring control box (34) is fixedly mounted on the top of the mounting column (62), and the servo motor (33) is electrically connected to the monitoring and analysis server.

6. The drum water level monitoring and alarm device during boiler boiling according to claim 5, characterized in that: The servo motor (33) is started to work once by the monitoring and analysis server at intervals, and each working time is 3-5 seconds. Each time the servo motor (33) works, the data collected by the pressure sensor (73) during the working time period of the servo motor (33) is recorded. The pressure sensor (73) collects data every 0.1 seconds, and all data during the non-uniform speed time period of the servo motor (33) during the starting and stopping process are discarded. The monitoring control box (34) is provided with a battery, a data acquisition chip and a wireless module. All sensors are electrically connected to the data acquisition chip. The battery supplies power to the data acquisition chip. The wireless module is installed on the data acquisition chip and is used to send data and receive signals.

7. The drum water level monitoring and alarm device during boiler boiling according to claim 6, characterized in that: The monitoring and analysis server is provided with a database, wherein different environmental data in the drum water tank (1) are stored in the database and corresponding to different pressure value data. The monitoring and analysis server is provided with an environmental architecture model, wherein the pressure value monitored by the pressure sensor (73) corresponds to the environmental data in the drum water tank (1), and these environmental data are structured on the environmental architecture model to construct an environmental map in the drum water tank (1).

8. A drum water level monitoring and alarm device during boiler boiling according to any one of claims 6 or 7, characterized in that: The two groups of water level monitoring units (2) and the two groups of tank environment analysis units (3) compare the two groups of collected data. If there is a large error in the monitoring data of the two groups of water level monitoring units (2) or / and the monitoring data of the two groups of tank environment analysis units (3), but neither group exceeds the alarm limit of the environment in the drum water tank (1), an alarm reminder will be activated.

9. The drum water level monitoring and alarm device during boiler boiling according to claim 1, characterized in that: One monitoring device is used to centrally control the water level monitoring units (2) and the tank environment analysis units (3) installed on the tops of a plurality of drum water tanks (1) arranged side by side, but the water level monitoring units (2) and the tank environment analysis units (3) installed on the tops of each drum water tank (1) are numbered and distinguished.

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