Drum water level monitoring method and device

Abstract

The present invention discloses a method and device for monitoring the water level of a drum, the method comprising: within a preset time period, when the change in boiler load exceeds a preset change, if the change in boiler load is consistent with the change in steam-water parameters, a false water level is obtained based on the change in boiler load and the change in steam-water parameters; multiple operating point parameters of the drum are obtained, the water level of the drum is obtained based on the multiple operating point parameters, and it is determined whether the water level of the drum exceeds or is lower than the preset water level, and an alarm is issued when it exceeds. The present application determines whether there is a false water level in the drum by determining whether the load change is consistent with the steam-water parameter change, and can improve the accuracy of monitoring the false water level of the drum. A false water level is obtained based on the load change and the steam-water parameter change, and the current water level of the drum is obtained based on multiple operating parameters of the drum, and it is determined whether the water level of the drum exceeds or is lower than the preset water level, thereby issuing a corresponding alarm.

Description

Technical Field

[0001] The present application relates to the technical field of drum water level, and more specifically, to a method and device for monitoring drum water level. Background Art

[0002] When the boiler load suddenly increases, the water level in the boiler drum will first rise rapidly, and then gradually decrease. The water level that rises rapidly at the beginning and then decreases is called a false water level. The reason for the false water level is that the boiler load suddenly increases, and the steam pressure will drop quickly. At this time, on the one hand, the specific volume of the steam-water mixture increases, and on the other hand, the saturation temperature decreases. Due to the decrease in saturation temperature, the evaporator tube metal and boiler water release part of the heat, generating more steam. The steam content in the boiler water volume increases, and the volume of steam and water expands, causing the water level to rise rapidly, forming a false water level. Generally, the false water level is not easy to monitor. If the boiler load suddenly increases, the false water level is very serious, and the water level rises more seriously, which is likely to cause a full water accident. Vice versa, if the boiler load suddenly decreases, the false water level drops more seriously, which is likely to cause a water shortage accident, so it is very important to monitor the false water level of the drum.

[0003] Therefore, how to improve the accuracy of false water level monitoring in the steam drum is a technical problem that needs to be solved. Summary of the invention

[0004] The present invention provides a method for monitoring the water level of a steam drum, which is used to solve the technical problem of low accuracy of monitoring the false water level of the steam drum in the prior art. The method is applied to the steam drum, and the method comprises:

[0005] When the boiler load change exceeds the preset change amount within the preset time period, determine whether the boiler load change is consistent with the steam-water parameter change;

[0006] If the boiler load change is consistent with the steam-water parameter change, a false water level is obtained based on the boiler load change and the steam-water parameter change;

[0007] Acquire multiple operating point parameters of the drum, acquire the drum water level based on the multiple operating point parameters, determine whether the drum water level exceeds or is lower than a preset water level, and issue an alarm when it exceeds;

[0008] The soda parameters include the soda saturation temperature and the specific volume of the soda mixture, and the preset water level is the sum or difference between the normal water level and the false water level.

[0009] In some embodiments of the present application, the boiler load change exceeds the preset change, specifically:

[0010] The boiler load increase exceeds the preset increase;

[0011] Or, the boiler load reduction exceeds the preset reduction.

[0012] In some embodiments of the present application, it is determined whether the boiler load change is consistent with the steam-water parameter change, specifically:

[0013] In a preset time period, when the boiler load increases, the steam-water saturation temperature decreases and the specific volume of the steam-water mixture increases. At this time, the change in the boiler load is consistent with the change in the steam-water parameters;

[0014] Or, within a preset time period, when the boiler load decreases, the steam-water saturation temperature increases and the specific volume of the steam-water mixture decreases. At this time, the change in boiler load is consistent with the change in steam-water parameters.

[0015] In some embodiments of the present application, the method further includes:

[0016] If the boiler load change is inconsistent with the steam-water parameter change, the boiler load change, the steam-water parameter change and the steam-water parameter change in another time period are re-obtained.

[0017] In some embodiments of the present application, it is determined whether the drum water level exceeds or falls below a preset water level, and an alarm is given when the water level exceeds the preset water level, specifically:

[0018] When the boiler load increases, the preset water level is the sum of the normal water level and the false water level. When the drum water level exceeds the preset water level, a false water level high alarm is issued;

[0019] When the boiler load decreases, the preset water level is the difference between the normal water level and the false water level. When the drum water level is lower than the preset water level, a false water level low alarm is issued.

[0020] Correspondingly, the present application also provides a drum water level monitoring device, which is applied to a drum and includes:

[0021] A judgment module is used to judge whether the boiler load change is consistent with the steam-water parameter change when the boiler load change exceeds the preset change within a preset time period;

[0022] A first acquisition module is used to obtain a false water level based on the boiler load change and the steam-water parameter change if the boiler load change is consistent with the steam-water parameter change;

[0023] An alarm module is used to obtain parameters of multiple operating points of the drum, obtain the water level of the drum based on the parameters of the multiple operating points, determine whether the water level of the drum exceeds or is lower than a preset water level, and alarm when it exceeds;

[0024] The soda parameters include the soda saturation temperature and the specific volume of the soda mixture, and the preset water level is the sum or difference between the normal water level and the false water level.

[0025] In some embodiments of the present application, the judgment module is specifically used to:

[0026] The boiler load increase exceeds the preset increase;

[0027] Or, the boiler load reduction exceeds the preset reduction.

[0028] In some embodiments of the present application, the judgment module is further specifically used for:

[0029] In a preset time period, when the boiler load increases, the steam-water saturation temperature decreases and the specific volume of the steam-water mixture increases. At this time, the change in the boiler load is consistent with the change in the steam-water parameters;

[0030] Or, within a preset time period, when the boiler load decreases, the steam-water saturation temperature increases and the specific volume of the steam-water mixture decreases. At this time, the change in boiler load is consistent with the change in steam-water parameters.

[0031] In some embodiments of the present application, the device further includes a second acquisition module, and the second acquisition module is used to:

[0032] If the boiler load change is inconsistent with the steam-water parameter change, the boiler load change, the steam-water parameter change and the steam-water parameter change in another time period are re-obtained.

[0033] In some embodiments of the present application, the alarm module is specifically used to:

[0034] When the boiler load increases, the preset water level is the sum of the normal water level and the false water level. When the drum water level exceeds the preset water level, a false water level high alarm is issued;

[0035] When the boiler load decreases, the preset water level is the difference between the normal water level and the false water level. When the drum water level is lower than the preset water level, a false water level low alarm is issued.

[0036] By applying the above technical scheme, the method of the present application includes: within a preset time period, when the boiler load change exceeds the preset change, judging whether the boiler load change is consistent with the steam-water parameter change; if the boiler load change is consistent with the steam-water parameter change, obtaining a false water level based on the boiler load change and the steam-water parameter change; obtaining multiple operating point parameters of the drum, obtaining the drum water level based on the multiple operating point parameters, judging whether the drum water level exceeds or is lower than the preset water level, and alarming when it exceeds. The present application can improve the accuracy of the false water level monitoring of the drum by judging whether the boiler load change exceeds the preset change and whether the boiler load change is consistent with the steam-water parameter change. A false water level is obtained according to the load change and the steam-water parameter change. The current drum water level is obtained according to multiple operating parameters of the drum. It is judged whether the drum water level exceeds or is lower than the preset water level, so as to issue a corresponding alarm. The false water level of the drum is accurately monitored and an alarm is issued when it exceeds or is lower than the preset water level. This improves the monitoring accuracy of the false water level, thereby ensuring the normal and efficient operation of the drum and avoiding the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic flow chart of a method for monitoring a drum water level according to an embodiment of the present invention is shown;

[0039] Figure 2 A schematic structural diagram of a drum water level monitoring device proposed in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] In the prior art, the drum is a cylindrical pressure vessel used in water tube boilers for steam-water separation and steam purification, forming a water circulation loop and storing boiler water. Its main function is to receive water from the economizer, separate steam from water, supply water to the circulation loop, and deliver saturated steam to the superheater. There is a certain amount of water in the drum, which has a certain amount of heat and working fluid storage. It can slow down the speed of steam pressure change when the working conditions change, and play a certain buffering role when the feed water and load are not coordinated for a short time. The drum is equipped with internal devices to separate steam from water, clean steam, add chemicals in the pot, and continuously discharge sewage to ensure the quality of steam. There is often a false water level in the drum, but because the false water level will gradually decrease, people pay little attention to it and there is no effective monitoring method. If the false water level is too high, it may cause a water-filled accident in the drum, and if the false water level is too low, it may cause a water-deficient accident in the drum, so it is very important to monitor the false water level of the drum. The drum, also known as the boiler drum, is the most important pressure component in the natural circulation boiler, and is mainly used in medium-pressure and high-pressure subcritical boilers in power production.

[0042] The present application embodiment provides a drum water level monitoring method, which is applied to a drum. Figure 1 As shown, the method comprises the following steps:

[0043] Step S101, within a preset time period, when the boiler load change exceeds a preset change, determining whether the boiler load change is consistent with the steam-water parameter change;

[0044] Step S102, if the boiler load change is consistent with the steam-water parameter change, a false water level is obtained based on the boiler load change and the steam-water parameter change;

[0045] Step S103, obtaining parameters of multiple operating points of the drum, obtaining the drum water level based on the multiple operating point parameters, determining whether the drum water level exceeds or is lower than a preset water level, and giving an alarm when the level exceeds.

[0046] In step S101, within a preset time period, when the boiler load change exceeds a preset change, it is determined whether the boiler load change is consistent with the steam-water parameter change.

[0047] In this embodiment, when the boiler load change exceeds the preset change within a certain time period, it is determined whether the boiler load change is consistent with the steam-water parameter change. The boiler load change and the steam-water parameter change are the changes within this time period. The steam-water parameters include the steam-water saturation temperature and the specific volume of the steam-water mixture.

[0048] It can be understood that within the preset time period, it does not refer to a fixed time period, but that the boiler load has been in an increasing or decreasing state for a continuous preset time period, and the increase or decrease in the boiler load exceeds the preset change. It should be noted that within this time period, the boiler load can only have one change state, that is, the boiler load increases or decreases, and the same is true for the changes in steam-water parameters, which can only increase or decrease.

[0049] In some embodiments of the present application, the boiler load change exceeds the preset change, specifically:

[0050] The increase in boiler load exceeds the preset increase; or the decrease in boiler load exceeds the preset decrease. Within the preset time period, the boiler load can only increase or decrease. There cannot be other states such as increase first and then decrease or decrease first and then increase within the time period.

[0051] In step S102, if the boiler load change is consistent with the steam-water parameter change, a false water level is obtained based on the boiler load change and the steam-water parameter change.

[0052] In this embodiment, if the change in boiler load is consistent with the change in steam-water parameters, it means that there is a false water level in the drum. The false water level is obtained based on the change in boiler load, the change in steam-water saturation temperature, and the change in the specific volume of the steam-water mixture. This false water level is a false water level threshold, not the false water level at this time. The false water level is not the height calculated from the zero water level, but the height of the drum water level that starts to rise and then gradually decreases, that is, the water level change height. The false water level is the growth height when the drum water level is the highest.

[0053] In some embodiments of the present application, it is determined whether the boiler load change is consistent with the steam-water parameter change, specifically:

[0054] In a preset time period, when the boiler load increases, the steam-water saturation temperature decreases and the specific volume of the steam-water mixture increases. At this time, the change in the boiler load is consistent with the change in the steam-water parameters;

[0055] Or, within a preset time period, when the boiler load decreases, the steam-water saturation temperature increases and the specific volume of the steam-water mixture decreases. At this time, the change in boiler load is consistent with the change in steam-water parameters.

[0056] In this embodiment, within a preset time period, when the boiler load increases, the steam-water saturation temperature decreases, and the specific volume of the steam-water mixture increases. At this time, the boiler load change is consistent with the steam-water parameter change, indicating that the boiler load increases, the false water level increases, and the drum water level increases. Or, within a preset time period, when the boiler load decreases, the steam-water saturation temperature increases, and the specific volume of the steam-water mixture decreases. At this time, the boiler load change is consistent with the steam-water parameter change, indicating that the boiler load decreases, the false water level decreases, and the drum water level decreases.

[0057] In some embodiments of the present application, the method further includes:

[0058] If the boiler load change is inconsistent with the steam-water parameter change, the boiler load change, the steam-water parameter change and the steam-water parameter change in another time period are re-obtained.

[0059] In step S103, multiple operating point parameters of the drum are obtained, and the drum water level is obtained based on the multiple operating point parameters to determine whether the drum water level exceeds or is lower than a preset water level, and an alarm is triggered when the level exceeds the preset water level.

[0060] In some embodiments of the present application, it is determined whether the drum water level exceeds or falls below a preset water level, and an alarm is given when the water level exceeds the preset water level, specifically:

[0061] When the boiler load increases, the preset water level is the sum of the normal water level and the false water level. When the drum water level exceeds the preset water level, a false water level high alarm is issued;

[0062] When the boiler load decreases, the preset water level is the difference between the normal water level and the false water level. When the drum water level is lower than the preset water level, a false water level low alarm is issued.

[0063] It is understandable that the above-mentioned preset time period, preset change amount, normal water level and other values ​​can be adjusted or changed according to actual needs, which all fall within the protection scope of this application.

[0064] By applying the above technical scheme, the method of the present application includes: within a preset time period, when the boiler load change exceeds the preset change, judging whether the boiler load change is consistent with the steam-water parameter change; if the boiler load change is consistent with the steam-water parameter change, obtaining a false water level based on the boiler load change and the steam-water parameter change; obtaining multiple operating point parameters of the drum, obtaining the drum water level based on the multiple operating point parameters, judging whether the drum water level exceeds or is lower than the preset water level, and alarming when it exceeds. The present application can improve the accuracy of the false water level monitoring of the drum by judging whether the boiler load change exceeds the preset change and whether the boiler load change is consistent with the steam-water parameter change. A false water level is obtained according to the load change and the steam-water parameter change. The current drum water level is obtained according to multiple operating parameters of the drum. It is judged whether the drum water level exceeds or is lower than the preset water level, so as to issue a corresponding alarm. The false water level of the drum is accurately monitored and an alarm is issued when it exceeds or is lower than the preset water level. This improves the monitoring accuracy of the false water level, thereby ensuring the normal and efficient operation of the drum and avoiding the occurrence of safety accidents.

[0065] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present invention.

[0066] In order to further explain the technical idea of ​​the present invention, the technical solution of the present invention is now described in combination with specific application scenarios.

[0067] Usually, in the drum water level monitoring and adjustment, in order to make the drum have enough steam space, ensure good steam-water separation effect, and obtain good quality steam, it is generally stipulated that 150mm below the drum centerline is the zero water level. The normal fluctuation range is ±50mm, and the maximum fluctuation range does not exceed ±75mm. The drum water level should be maintained between -50mm and +50mm (normal water level) during operation. The preset water level (the sum or difference of the false water level and the normal water level) should not exceed ±75mm.

[0068] Obtain the parameters of multiple operating points of the drum, and obtain the drum water level based on the parameters of multiple operating points. The specific formula is:

[0069] V 1 =M 1 / ρ 1=1 / 3*π*L 2 *(3*rL)+1 / 2*r 2 *(W-2*r)*(θ / 180-sinθ)

[0070] Among them, θ=2*arccos(1-r / L), arccos is the arccosine function, V1 is the volume of the working medium under the water surface, W is the total length of the drum, L is the height of the drum water surface from the bottom of the drum, and r is the hemispherical radius at both ends of the drum. Therefore, the drum water level is:

[0071] L = f -1 (V 1 )

[0072] Through the iterative algorithm, V 1 Reverse calculation of the drum water level L

[0073] M 1 / (V 0 *ρ 1 )=∫(We+Wr-Wd-Wev)dt

[0074] M 1 =1 / (V 0 *ρ 1 )*∫(We+Wr-Wd-Wev)dt

[0075] (μ 1 *M 1 )=∫(We*he+Wr*hr-Wd*hd-Wev*hev)dt

[0076] μ 1 =1 / M 1 *∫(We+Wr-Wd-Wev)dt

[0077] Wev—steam flow out of the drum, V 0 —The initial volume of working fluid below the water surface in the drum, ρ 1 — working medium density under water surface in drum, M 1 — working medium mass under the drum water surface; We—feedwater flow rate, Wr—riser pipe steam-water mixture flow rate, Wd—downer pipe steam-water mixture flow rate;

[0078] We—feedwater flow rate, he—feedwater enthalpy, Wr—riser pipe steam-water mixture flow rate, hr—riser pipe steam-water mixture enthalpy, Wd—downcomer steam-water mixture flow rate, hd—downcomer steam-water mixture enthalpy, Wev—steam flow rate out of the drum, hev—steam enthalpy out of the drum, μ 1 —Average internal energy of the working fluid under water surface.

[0079] The obtained drum water level L already includes the false water level, so the drum water level can be directly compared with the preset water level.

[0080] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present invention.

[0081] Correspondingly, the present application also provides a drum water level monitoring device, which is applied to a drum and includes:

[0082] The judgment module 201 is used to judge whether the boiler load change is consistent with the steam-water parameter change when the boiler load change exceeds the preset change within the preset time period;

[0083] A first acquisition module 202 is used to obtain a false water level based on the boiler load change and the steam-water parameter change if the boiler load change is consistent with the steam-water parameter change;

[0084] An alarm module 203 is used to obtain parameters of multiple operating points of the drum, obtain the drum water level based on the multiple operating point parameters, determine whether the drum water level exceeds or falls below a preset water level, and generate an alarm when the water level exceeds the preset water level;

[0085] The soda parameters include the soda saturation temperature and the specific volume of the soda mixture, and the preset water level is the sum or difference between the normal water level and the false water level.

[0086] In some embodiments of the present application, the determination module 201 is specifically used to:

[0087] The boiler load increase exceeds the preset increase;

[0088] Or, the boiler load reduction exceeds the preset reduction.

[0089] In some embodiments of the present application, the judgment module 201 is further specifically used for:

[0090] In a preset time period, when the boiler load increases, the steam-water saturation temperature decreases and the specific volume of the steam-water mixture increases. At this time, the change in the boiler load is consistent with the change in the steam-water parameters;

[0091] Or, within a preset time period, when the boiler load decreases, the steam-water saturation temperature increases and the specific volume of the steam-water mixture decreases. At this time, the change in boiler load is consistent with the change in steam-water parameters.

[0092] In some embodiments of the present application, the device further includes a second acquisition module, and the second acquisition module is used to:

[0093] If the boiler load change is inconsistent with the steam-water parameter change, the boiler load change, the steam-water parameter change and the steam-water parameter change in another time period are re-obtained.

[0094] In some embodiments of the present application, the alarm module 203 is specifically used to:

[0095] When the boiler load increases, the preset water level is the sum of the normal water level and the false water level. When the drum water level exceeds the preset water level, a false water level high alarm is issued;

[0096] When the boiler load decreases, the preset water level is the difference between the normal water level and the false water level. When the drum water level is lower than the preset water level, a false water level low alarm is issued.

[0097] Those skilled in the art will appreciate that the modules in the device in the implementation scenario can be distributed in the device in the implementation scenario according to the implementation scenario description, or can be changed accordingly and located in one or more devices different from the implementation scenario. The modules in the above implementation scenario can be combined into one module, or can be further split into multiple sub-modules.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A drum water level monitoring method, characterized in that: Applied to a steam drum, the method comprises: When the boiler load change exceeds the preset change amount within the preset time period, determine whether the boiler load change is consistent with the steam-water parameter change; If the boiler load change is consistent with the steam-water parameter change, a false water level is obtained based on the boiler load change and the steam-water parameter change; Acquire multiple operating point parameters of the drum, acquire the drum water level based on the multiple operating point parameters, determine whether the drum water level exceeds or is lower than a preset water level, and issue an alarm when it exceeds; Wherein, the soda parameters include the soda saturation temperature and the soda mixture specific volume, and the preset water level is the sum or difference between the normal water level and the false water level; Determine whether the boiler load change is consistent with the steam-water parameter change, specifically: In a preset time period, when the boiler load increases, the steam-water saturation temperature decreases and the specific volume of the steam-water mixture increases. At this time, the change in the boiler load is consistent with the change in the steam-water parameters; Or, within a preset time period, when the boiler load decreases, the steam-water saturation temperature increases and the specific volume of the steam-water mixture decreases. At this time, the change in boiler load is consistent with the change in steam-water parameters.

2. The method according to claim 1, characterized in that The boiler load change exceeds the preset change, specifically: The boiler load increase exceeds the preset increase; Or, the boiler load reduction exceeds the preset reduction.

3. The method according to claim 1, characterized in that The method further comprises: If the boiler load change is inconsistent with the steam-water parameter change, the boiler load change, the steam-water parameter change and the steam-water parameter change in another time period are re-obtained.

4. The method according to claim 1, characterized in that Determine whether the drum water level exceeds or is below a preset water level, and give an alarm when it exceeds the preset water level, specifically: When the boiler load increases, the preset water level is the sum of the normal water level and the false water level. When the drum water level exceeds the preset water level, a false water level high alarm is issued; When the boiler load decreases, the preset water level is the difference between the normal water level and the false water level. When the drum water level is lower than the preset water level, a false water level low alarm is issued.

5. A drum water level monitoring device, characterized in that: Applied in a steam drum, the device comprises: A judgment module is used to judge whether the boiler load change is consistent with the steam-water parameter change when the boiler load change exceeds the preset change within a preset time period; A first acquisition module is used to obtain a false water level based on the boiler load change and the steam-water parameter change if the boiler load change is consistent with the steam-water parameter change; An alarm module is used to obtain parameters of multiple operating points of the drum, obtain the water level of the drum based on the parameters of the multiple operating points, determine whether the water level of the drum exceeds or is lower than a preset water level, and alarm when it exceeds; Wherein, the soda parameters include the soda saturation temperature and the soda mixture specific volume, and the preset water level is the sum or difference between the normal water level and the false water level; The judgment module is further specifically used for: In a preset time period, when the boiler load increases, the steam-water saturation temperature decreases and the specific volume of the steam-water mixture increases. At this time, the change in the boiler load is consistent with the change in the steam-water parameters; Or, within a preset time period, when the boiler load decreases, the steam-water saturation temperature increases and the specific volume of the steam-water mixture decreases. At this time, the change in boiler load is consistent with the change in steam-water parameters.

6. The device according to claim 5, characterized in that The judgment module is specifically used for: The boiler load increase exceeds the preset increase; Or, the boiler load reduction exceeds the preset reduction.

7. The device according to claim 5, characterized in that The device further includes a second acquisition module, wherein the second acquisition module is configured to: If the boiler load change is inconsistent with the steam-water parameter change, the boiler load change, the steam-water parameter change and the steam-water parameter change in another time period are re-obtained.

8. The device according to claim 5, characterized in that The alarm module is specifically used for: When the boiler load increases, the preset water level is the sum of the normal water level and the false water level. When the drum water level exceeds the preset water level, a false water level high alarm is issued; When the boiler load decreases, the preset water level is the difference between the normal water level and the false water level. When the drum water level is lower than the preset water level, a false water level low alarm is issued.

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