Periodic switching method and system for gypsum discharge pump

Abstract

The invention provides a regular switching method and system for gypsum discharge pumps, and belongs to the field of intelligent control of desulfurization devices. The regular switching method of the gypsum discharge pump comprises the following steps: determining a corresponding gypsum slurry density value when the gypsum discharge pump is started in an interlocking manner and a corresponding gypsum slurry density value when the gypsum discharge pump is stopped in the interlocking manner; the accumulated equivalent running time of the gypsum discharge pump in the preset time period is determined, and the running time needed when the gypsum discharge pump works from the current moment to interlocking running stopping is determined; according to the corresponding gypsum slurry density value when the gypsum discharge pump is started in an interlocking manner, the corresponding gypsum slurry density value when the gypsum discharge pump is stopped in an interlocking manner, the required operation time when the gypsum discharge pump works from the current moment to the interlocking stop operation, and the accumulated equivalent operation time of the gypsum discharge pump in a preset time period; determining a regular switching strategy of the gypsum discharge pump; and regularly switching the gypsum discharge pump according to the regular switching strategy.

Description

Technical Field

[0001] The present invention relates to the field of intelligent control of desulfurization devices, and in particular to a periodic switching method of a gypsum discharge pump, a periodic switching system of a gypsum discharge pump, a computer device and a computer-readable storage medium. Background Art

[0002] The gypsum discharge pump is an important equipment in the desulfurization device. It is responsible for discharging the crystallized gypsum slurry in the absorption tower to the primary dehydration system. The start and stop of the gypsum discharge pump mainly refers to the density of the absorption tower slurry. The slurry density is the main parameter reflecting the gypsum crystallization situation. The gypsum discharge pump is started when the absorption tower slurry density is high, and the gypsum discharge pump is stopped when the density is low. The speed at which the density of the absorption tower slurry decreases depends on the concentration of SO2 in the original flue gas and the flue gas flow rate. The greater the concentration of SO2 in the original flue gas and the flue gas flow rate, the more gypsum is produced, and the slower the density decreases. Therefore, the running time of the gypsum discharge pump changes dynamically with the change of flue gas parameters.

[0003] The design capacity of the gypsum discharge pump is one in operation and one in standby, that is, one in operation and one in standby. One gypsum discharge pump can meet the gypsum slurry discharge volume under rated flue gas conditions. Under extreme conditions, two gypsum discharge pumps can operate simultaneously. According to the equipment operation and maintenance requirements, the equipment should be switched regularly to ensure the stability and reliability of the gypsum discharge pump and promote the healthy operation of the equipment.

[0004] The existing technology currently switches the gypsum discharge pump by setting a fixed cycle. Specifically, the equipment switches after a fixed natural day of operation or intermittent operation, that is, the standby pump is started and the main pump is stopped. The existing technology causes the gypsum discharge pump to be switched when the actual operation time is less than the theoretical switching time. Long-term operation will cause one gypsum discharge pump to run for a long time and the other to run for a short time, which will cause the lifespan of the two devices to be different, and ultimately affect the safe operation of the system. Summary of the invention

[0005] In order to solve the above technical defects, the present invention provides a method and system for periodic switching of a gypsum discharge pump. The method for periodic switching of the gypsum discharge pump sets the interlock start and interlock stop of the gypsum discharge pump according to the density of the gypsum slurry in the absorption tower, and determines the periodic switching strategy for periodically switching the gypsum discharge pump by calculating the running time required for the gypsum discharge pump to work until the interlock stop and the cumulative equivalent running time of the gypsum discharge pump. By calculating the cumulative equivalent running time of the gypsum discharge pump, it is ensured that the service life of the two gypsum discharge pumps is the same, thereby ensuring the safe operation of the desulfurization system.

[0006] A first aspect of the present invention provides a method for periodically switching a gypsum discharge pump, comprising:

[0007] Determine the density value of the gypsum slurry corresponding to when the gypsum discharge pump interlock is started and the density value of the gypsum slurry corresponding to when the gypsum discharge pump interlock is stopped;

[0008] Determine the accumulated equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump;

[0009] According to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry and the current density of the gypsum slurry, the running time required for the gypsum discharge pump to stop running from the current moment is determined;

[0010] Determine the periodic switching strategy of the gypsum discharge pump according to the gypsum slurry density value corresponding to the start of the gypsum discharge pump interlock and the gypsum slurry density value corresponding to the stop of the gypsum discharge pump interlock, the running time required for the gypsum discharge pump to run from the current moment to the stop of the interlock, and the accumulated equivalent running time of the gypsum discharge pump in a preset time period;

[0011] The gypsum discharge pump is switched periodically according to the periodic switching strategy.

[0012] In the embodiment of the present invention, the operation time required for the gypsum discharge pump to operate from the current moment to the interlock stop is determined according to the flue gas flow rate of the original flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry, and the current density of the gypsum slurry when the absorption tower treats the flue gas, including:

[0013] Determine the instantaneous flow rate of the gypsum discharge pump according to the current liquid level of the gypsum slurry in the absorption tower when treating flue gas;

[0014] According to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current density of the gypsum slurry and the instantaneous flow rate of the gypsum discharge pump, the operating time required for the gypsum discharge pump to work from the current moment to the interlock stop is determined.

[0015] In the embodiment of the present invention, the operation time required for the gypsum discharge pump to operate from the current moment to the interlock stop is determined according to the flue gas flow rate of the original flue gas, the concentration of SO2 in the original flue gas, the current density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump when the absorption tower treats the flue gas, including:

[0016] Obtain historical data of the flue gas flow rate of the original flue gas in the absorption tower, the concentration of SO2 in the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump within a preset time period;

[0017] The obtained historical data of the flue gas flow rate of the original flue gas in the absorption tower, the concentration of SO2 in the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump in a preset time period are used as training samples to train the pre-built gypsum discharge pump operation time expert model to obtain a trained gypsum discharge pump operation time expert model;

[0018] The flue gas flow rate value of the original flue gas, the SO2 concentration value in the original flue gas, the current density value of the gypsum slurry and the instantaneous flow rate value of the gypsum discharge pump are obtained when the absorption tower is treating the flue gas, and the flue gas flow rate value of the original flue gas, the SO2 concentration value in the original flue gas, the current density value of the gypsum slurry and the instantaneous flow rate value of the gypsum discharge pump are input into the trained gypsum discharge pump operation time expert model when the absorption tower is treating the flue gas, and the trained gypsum discharge pump operation time expert model is used to calculate the operation time required for the gypsum discharge pump to work until the interlocking stop.

[0019] In the embodiment of the present invention, the influencing factor affecting the operation time of the gypsum discharge pump is the slurry density of the gypsum slurry in the absorption tower;

[0020] The method of determining the accumulated equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump includes:

[0021] Determine the real-time density value of the gypsum slurry in the absorption tower at the end of the preset time period and the accumulated actual operation time of the gypsum discharge pump in the preset time period;

[0022] The accumulated equivalent running time of the gypsum discharge pump in the preset time period is calculated according to the real-time density value of the gypsum slurry at the end of the preset time period in the absorption tower and the accumulated actual running time of the gypsum discharge pump in the preset time period.

[0023] In an embodiment of the present invention, the method of calculating the accumulated equivalent running time of the gypsum discharge pump in the preset time period according to the real-time density value of the gypsum slurry at the end of the preset time period in the absorption tower and the accumulated actual running time of the gypsum discharge pump in the preset time period includes:

[0024] According to the real-time density value of the gypsum slurry at the end of the preset time period and the accumulated actual operation time of the gypsum discharge pump in the preset time period, the average relative density of the gypsum slurry during the operation of the gypsum discharge pump in the preset time period is calculated;

[0025] The accumulated equivalent running time of the gypsum discharge pump in the preset time period is calculated based on the accumulated actual running time of the gypsum discharge pump in the preset time period and the average relative density of the gypsum slurry during the operation of the gypsum discharge pump in the preset time period.

[0026] In the embodiment of the present invention, the periodic switching strategy of the gypsum discharge pump is determined according to the gypsum slurry density value corresponding to the interlock start of the gypsum discharge pump and the gypsum slurry density value corresponding to the interlock stop of the gypsum discharge pump, the running time required for the gypsum discharge pump to work from the current moment to the interlock stop operation, and the accumulated equivalent running time of the gypsum discharge pump in a preset time period, including:

[0027] When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is less than the first preset value, and the density of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump interlock stop, the main gypsum discharge pump currently in operation is stopped; when the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump interlock start, the main gypsum discharge pump is continued to be started;

[0028] When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is greater than or equal to the first preset value and less than the second preset value, and the density of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump interlock stop, the currently running main gypsum discharge pump is stopped; when the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump interlock start, the standby gypsum discharge pump is started;

[0029] When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is greater than or equal to the second preset value, and the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the interlock start of the gypsum discharge pump, it is determined whether the running time required for the main gypsum discharge pump currently in operation from the current moment to the interlock stop is greater than the third preset value;

[0030] Among them, if the running time required for the currently running main gypsum discharge pump from the current moment to the interlocking stop is greater than the third preset value, the currently running main gypsum discharge pump is stopped and the standby gypsum discharge pump is started; if the running time required for the currently running main gypsum discharge pump from the current moment to the interlocking stop is less than the third preset value, the currently running main gypsum discharge pump continues to work until the density value of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump when the interlocking stop is stopped, and the currently running main gypsum discharge pump is stopped; when the density value of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump when the interlocking stop is stopped, the standby gypsum discharge pump is started.

[0031] In the embodiment of the present invention, the first preset value is 95% of the preset period, the second preset value is 100% of the preset period, and the third preset value is 5% of the preset period.

[0032] A second aspect of the present invention provides a periodic switching system for a gypsum discharge pump, comprising:

[0033] An interlock value determination module, used to determine a gypsum slurry density value corresponding to when the gypsum discharge pump interlock is started and a gypsum slurry density value corresponding to when the gypsum discharge pump interlock is stopped;

[0034] A calculation module is used to determine the cumulative equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump, and to determine the running time required for the gypsum discharge pump to start working from the current moment to stop running when interlocked according to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry, and the current density of the gypsum slurry;

[0035] The control module is used to determine the periodic switching strategy of the gypsum discharge pump based on the gypsum slurry density value corresponding to the interlock start of the gypsum discharge pump and the gypsum slurry density value corresponding to the interlock stop of the gypsum discharge pump, the running time required for the gypsum discharge pump to start from the current moment to the interlock stop, and the accumulated equivalent running time of the gypsum discharge pump in a preset time period, and to periodically switch the gypsum discharge pump according to the periodic switching strategy.

[0036] A third aspect of the present invention provides a computer device, comprising:

[0037] a memory storing a computer program;

[0038] A processor is used to execute the computer program to implement the periodic switching method of the gypsum discharge pump as described above.

[0039] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the periodic switching method of the gypsum discharge pump as described above.

[0040] The periodic switching method of the gypsum discharge pump sets the interlock start and interlock stop of the gypsum discharge pump according to the density of the gypsum slurry in the absorption tower, and determines the periodic switching strategy for periodically switching the gypsum discharge pump by calculating the running time required for the gypsum discharge pump to work until the interlock stop and the cumulative equivalent running time of the gypsum discharge pump. By calculating the cumulative equivalent running time of the gypsum discharge pump, it is ensured that the service life of the two gypsum discharge pumps is the same, thereby ensuring the safe operation of the desulfurization system.

[0041] Other features and advantages of the technical solution of the present invention will be described in detail in the specific implementation section below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0043] Figure 1 is a flow chart of a method for periodically switching a gypsum discharge pump provided by an embodiment of the present invention;

[0044] Figure 2 It is a structural block diagram of a periodic switching system of a gypsum discharge pump provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to make the technical solutions and advantages of the embodiments of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the process of realizing the present invention, the inventors found that the gypsum discharge pump is an important equipment in the desulfurization device, which is responsible for discharging the crystallized gypsum slurry in the absorption tower to the primary dehydration system. The start and stop of the gypsum discharge pump mainly refers to the density of the slurry in the absorption tower. The slurry density is the main parameter reflecting the gypsum crystallization situation. The gypsum discharge pump is started when the density of the slurry in the absorption tower is high, and the gypsum discharge pump is stopped when the density is low. The speed at which the density of the slurry in the absorption tower decreases depends on the concentration of SO2 in the original flue gas and the flue gas flow rate. The greater the concentration of SO2 in the original flue gas and the flue gas flow rate, the more gypsum is produced, and the slower the density decreases. Therefore, the operating time of the gypsum discharge pump changes dynamically with the change of flue gas parameters.

[0050] The design capacity of the gypsum discharge pump is one in operation and one in standby, that is, one in operation and one in standby. One gypsum discharge pump can meet the gypsum slurry discharge volume under rated flue gas conditions. Under extreme conditions, two gypsum discharge pumps can operate simultaneously. According to the equipment operation and maintenance requirements, the equipment should be switched regularly to ensure the stability and reliability of the gypsum discharge pump and promote the healthy operation of the equipment.

[0051] The existing technology currently switches the gypsum discharge pump by setting a fixed cycle. Specifically, the equipment switches after a fixed natural day of operation or intermittent operation, that is, the standby pump is started and the main pump is stopped. The existing technology causes the gypsum discharge pump to be switched when the actual operation time is less than the theoretical switching time. Long-term operation will cause one gypsum discharge pump to run for a long time and the other to run for a short time, which will cause the lifespan of the two devices to be different, and ultimately affect the safe operation of the system.

[0052] In view of the above problems, an embodiment of the present invention provides a method for periodically switching a gypsum discharge pump, including: determining a gypsum slurry density value corresponding to when the gypsum discharge pump is interlocked and started, and a gypsum slurry density value corresponding to when the gypsum discharge pump is interlocked and stopped; determining the cumulative equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump; determining the running time required for the gypsum discharge pump to work from the current moment to stop working from the interlocking according to the flue gas flow rate of the original flue gas when the absorption tower treats the flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry, and the current density of the gypsum slurry; determining a periodic switching strategy for the gypsum discharge pump according to the gypsum slurry density value corresponding to when the gypsum discharge pump is interlocked and started, and the gypsum discharge pump The corresponding gypsum slurry density value when the gypsum discharge pump is interlocked and stopped, the running time required for the gypsum discharge pump to work from the current moment to stop working from the interlocking, and the cumulative equivalent running time of the gypsum discharge pump within the preset time period; and periodically switching the gypsum discharge pump according to the periodic switching strategy. The periodic switching method of the gypsum discharge pump sets the interlock start and interlock stop of the gypsum discharge pump according to the density of the gypsum slurry in the absorption tower, and determines the periodic switching strategy for periodically switching the gypsum discharge pump by calculating the running time required for the gypsum discharge pump to work until the interlock stop and the cumulative equivalent running time of the gypsum discharge pump. By calculating the cumulative equivalent running time of the gypsum discharge pump, it is ensured that the service life of the two gypsum discharge pumps is the same, thereby ensuring the safe operation of the desulfurization system.

[0053] As an important equipment of the desulfurization device, the continuous operation time of the gypsum discharge pump is not completely determined, which mainly depends on the density of the gypsum slurry in the absorption tower. The lower the density of the gypsum slurry in the absorption tower, the more conducive it is to provide the activity of the limestone slurry injected into the absorption tower, and the more sufficient the acid-base reaction in the absorption tower. In addition, the lower the density of the gypsum slurry in the absorption tower, the lower the operating current of the absorption tower agitator and the absorption tower slurry circulation pump, and the more power it will save. Therefore, the absorption tower is required to operate at a low density as much as possible. Therefore, under normal circumstances, the gypsum discharge pump is intermittently operated for a long time. The length of each continuous operation time depends on the speed of the gypsum slurry density decrease. If the speed of decrease is fast, the single continuous operation time is short, otherwise, the single operation time is long. Generally speaking, the single operation time of the gypsum discharge pump is intermittent for more than ten hours and as long as half a month.

[0054] Therefore, in order to achieve intelligent periodic switching, it is necessary to calculate the cumulative operating time and at the same time consider the harm of frequent start and stop of the equipment to the equipment.

[0055] Figure 1 FIG. 1 is a flow chart of a method for periodically switching a gypsum discharge pump provided by an embodiment of the present invention. Figure 1 As shown, the periodic switching method of the gypsum discharge pump provided in this embodiment includes the following steps:

[0056] S1. Determine the density value of the gypsum slurry corresponding to the start of the gypsum discharge pump interlock and the density value of the gypsum slurry corresponding to the stop of the gypsum discharge pump interlock;

[0057] S2. Determine the accumulated equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump;

[0058] S3. Determine the operating time required for the gypsum discharge pump to stop operating from the current time to the interlocking time according to the flue gas flow rate of the original flue gas, the concentration of SO2 in the original flue gas, the current level of the gypsum slurry, and the current density of the gypsum slurry when the absorber is treating the flue gas;

[0059] S4. Determine the regular switching strategy of the gypsum discharge pump according to the gypsum slurry density value corresponding to the gypsum discharge pump interlock start and the gypsum discharge pump interlock stop corresponding to the gypsum slurry density value, the running time required for the gypsum discharge pump to work from the current moment to the interlock stop operation, and the accumulated equivalent running time of the gypsum discharge pump in the preset time period;

[0060] S5. Regularly switch the gypsum discharge pump according to the regular switching strategy.

[0061] In step S1, the step of determining the gypsum slurry density value corresponding to when the gypsum discharge pump interlock is started and the gypsum slurry density value corresponding to when the gypsum discharge pump interlock is stopped includes:

[0062] The specific setting value of the interlock start-stop gypsum discharge pump is: when the density of gypsum slurry in the absorption tower is greater than 1150kg / m 3 When the density of gypsum slurry in the absorption tower is less than 1070kg / m 3 The interlock stops the gypsum discharge pump.

[0063] For the gypsum discharge pump, different slurry densities have different effects on the life of the mechanical seal of the gypsum discharge pump. The greater the density of the gypsum slurry, the greater the wear of the pump mechanical seal and the shorter the life. Therefore, if the density of the gypsum slurry is larger, the gypsum discharge pump can run for a shorter time. If the density is smaller, it can run for a longer time. In this way, the density of the gypsum slurry can be used as an influencing factor to correct the cumulative running time of the gypsum discharge pump and obtain the cumulative equivalent running time of the gypsum discharge pump. To ensure that the wear degree of the mechanical seals of the two pumps is the same, so as to achieve the fundamental purpose of regular switching. In step S2, the influencing factor affecting the running time of the gypsum discharge pump is the slurry density of the gypsum slurry in the absorption tower;

[0064] The method of determining the accumulated equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump includes:

[0065] Determine the real-time density value of the gypsum slurry in the absorption tower at the end of the preset time period and the accumulated actual operation time of the gypsum discharge pump in the preset time period;

[0066] The accumulated equivalent running time of the gypsum discharge pump in the preset time period is calculated according to the real-time density value of the gypsum slurry at the end of the preset time period in the absorption tower and the accumulated actual running time of the gypsum discharge pump in the preset time period.

[0067] In step S2, the cumulative equivalent running time of the gypsum discharge pump in the preset time period is calculated according to the real-time density value of the gypsum slurry at the end of the preset time period of the absorption tower and the cumulative actual running time of the gypsum discharge pump in the preset time period, including:

[0068] According to the real-time density value of the gypsum slurry at the end of the preset time period and the accumulated actual operation time of the gypsum discharge pump in the preset time period, the average relative density of the gypsum slurry during the operation of the gypsum discharge pump in the preset time period is calculated;

[0069] The accumulated equivalent running time of the gypsum discharge pump in the preset time period is calculated based on the accumulated actual running time of the gypsum discharge pump in the preset time period and the average relative density of the gypsum slurry during the operation of the gypsum discharge pump in the preset time period.

[0070] Specifically, the calculation formula for the accumulated equivalent running time of the gypsum discharge pump is as follows:

[0071] Dav=(1 / Tr)∫(D / 1150)dt;

[0072] Teq = Tr*Dav;

[0073] Where D is the real-time density of the gypsum slurry when the absorber is treating flue gas, kg / m 3 , Dav is the average relative density of the gypsum slurry during the operation of the gypsum discharge pump within the preset period, kg / m 3 , Tr is the accumulated actual running time of the gypsum discharge pump in the preset period, seconds, and Teq is the accumulated equivalent running time of the gypsum discharge pump in the preset period, seconds.

[0074] The density of the gypsum slurry in the absorption tower depends on the relationship between the SO2 concentration of the original flue gas and the flue gas flow rate of the original flue gas and the amount discharged by the gypsum discharge pump. The SO2 concentration of the original flue gas and the flue gas flow rate of the original flue gas are collected online by the DCS system (distributed control system), and the flow rate (instantaneous flow rate) discharged by the gypsum discharge pump is related to the liquid level of the absorption tower. The higher the liquid level of the absorption tower, the greater the flow rate of the gypsum discharge pump, and vice versa, the smaller the flow rate of the paste discharge pump. Therefore, the instantaneous flow rate of the gypsum discharge pump at different absorption tower liquid levels can be obtained based on the relationship curve between the pump inlet pressure head and the discharge pump flow rate provided by the gypsum discharge pump manufacturer. Specifically, in step S3, the operation time required for the gypsum discharge pump to work from the current moment to the interlocking stop is determined according to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry, and the current density of the gypsum slurry, including:

[0075] Determine the instantaneous flow rate of the gypsum discharge pump according to the current liquid level of the gypsum slurry in the absorption tower when treating flue gas;

[0076] According to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current density of the gypsum slurry and the instantaneous flow rate of the gypsum discharge pump, the operating time required for the gypsum discharge pump to work from the current moment to the interlock stop is determined.

[0077] Specifically, the calculation formula for the instantaneous flow rate of the gypsum discharge pump is:

[0078] Fdp=f(Lat); wherein, Fdp is the instantaneous flow value of the gypsum discharge pump, and Lat is the liquid level value of the gypsum slurry when the absorption tower is treating flue gas.

[0079] The calculation formula for the running time required for the gypsum discharge pump to work until the interlock stops is:

[0080] T = f(Fg, Dso2, Dgs, Fdp); T is the running time required for the gypsum discharge pump to work until the interlock stops (i.e. the gypsum discharge pump works until the gypsum slurry density is lower than 1070kg / m 3 The gypsum discharge pump needs to run for a certain period of time), Fg is the original flue gas flow rate, m 3 / h, Dso2 is the SO2 concentration of the original flue gas, mg / Nm 3 , Dgs: density of gypsum slurry in the absorption tower, kg / m 3 .

[0081] Further, in step S3, the operation time required for the gypsum discharge pump to work from the current moment to the interlock stop is determined according to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump, including:

[0082] Obtain historical data of the flue gas flow rate of the original flue gas in the absorption tower, the concentration of SO2 in the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump within a preset time period;

[0083] The obtained historical data of the flue gas flow rate of the original flue gas in the absorption tower, the concentration of SO2 in the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump in a preset time period are used as training samples to train the pre-built gypsum discharge pump operation time expert model to obtain a trained gypsum discharge pump operation time expert model;

[0084] The flue gas flow rate value of the original flue gas, the SO2 concentration value in the original flue gas, the current density value of the gypsum slurry and the instantaneous flow rate value of the gypsum discharge pump are obtained when the absorption tower is treating the flue gas, and the flue gas flow rate value of the original flue gas, the SO2 concentration value in the original flue gas, the current density value of the gypsum slurry and the instantaneous flow rate value of the gypsum discharge pump are input into the trained gypsum discharge pump operation time expert model when the absorption tower is treating the flue gas, and the trained gypsum discharge pump operation time expert model is used to calculate the operation time required for the gypsum discharge pump to work until the interlocking stop.

[0085] Furthermore, before using the historical data of the flue gas flow rate of the original flue gas in the absorption tower, the SO2 concentration of the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump within a preset time period as training samples to train the pre-constructed gypsum discharge pump operation time expert model, it is necessary to clean the historical data of the flue gas flow rate of the original flue gas in the absorption tower, the SO2 concentration of the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump within the preset time period in the training samples to eliminate invalid data.

[0086] In step S4, the periodic switching strategy of the gypsum discharge pump is determined according to the gypsum slurry density value corresponding to the interlock start of the gypsum discharge pump and the gypsum slurry density value corresponding to the interlock stop of the gypsum discharge pump, the running time required for the gypsum discharge pump to run from the current moment to the interlock stop, and the accumulated equivalent running time of the gypsum discharge pump in the preset time period, including:

[0087] When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is less than the first preset value, and the density of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump interlock stop, the main gypsum discharge pump currently in operation is stopped; when the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump interlock start, the main gypsum discharge pump is continued to be started;

[0088] When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is greater than or equal to the first preset value and less than the second preset value, and the density of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump interlock stop, the currently running main gypsum discharge pump is stopped; when the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump interlock start, the standby gypsum discharge pump is started;

[0089] When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is greater than or equal to the second preset value, and the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the interlock start of the gypsum discharge pump, it is determined whether the running time required for the main gypsum discharge pump currently in operation from the current moment to the interlock stop is greater than the third preset value;

[0090] Among them, if the running time required for the currently running main gypsum discharge pump from the current moment to the interlocking stop is greater than the third preset value, the currently running main gypsum discharge pump is stopped and the standby gypsum discharge pump is started; if the running time required for the currently running main gypsum discharge pump from the current moment to the interlocking stop is less than the third preset value, the currently running main gypsum discharge pump continues to work until the density value of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump when the interlocking stop is stopped, and the currently running main gypsum discharge pump is stopped; when the density value of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump when the interlocking stop is stopped, the standby gypsum discharge pump is started.

[0091] Specifically, the regular switching strategy of the gypsum discharge pump is:

[0092] (1) When the cumulative equivalent running time of the gypsum discharge pump is less than 95% of a switching cycle (i.e. 168*0.95=159.6 hours), and the density of the gypsum slurry is reduced to 1070 kg / m 3 When the interlock stops the gypsum discharge pump, the density of the gypsum slurry in the next absorption tower is greater than 1150kg / m 3 When it is necessary to interlock and start the gypsum discharge pump, continue to choose to start this pump.

[0093] (2) When the accumulated equivalent running time of the gypsum discharge pump is greater than or equal to 95% of a switching cycle (i.e., 168*0.95=159.6 hours) and less than 100% of a switching cycle, the density of the gypsum slurry is reduced to 1070 kg / m 3 The interlock stops the gypsum discharge pump. At this time, it can be regarded that the current gypsum discharge pump has completed the operation in this cycle. The density of the gypsum slurry in the absorption tower is greater than 1150kg / m 3 When the standby pump is started directly, the regular switching is completed.

[0094] (3) When the accumulated equivalent running time of the gypsum discharge pump is greater than or equal to 100% of a switching cycle, and the density of the gypsum slurry is not lower than the density of the gypsum discharge pump (1070kg / m 3 ), it is necessary to continue to run the gypsum discharge pump. At this time, the running time T required for the gypsum discharge pump to work until the interlocking stop should be calculated according to the gypsum discharge pump running time expert model (until the gypsum slurry density is lower than 1070kg / m3, the gypsum discharge pump is expected to have the remaining running time, h) for comparison. If T is greater than 5% of the switching cycle, it is considered that the running time is still long and the standby pump needs to be switched, that is, the running pump is stopped and the standby pump is started; otherwise, in order to avoid damage to the equipment due to frequent switching of pumps, the current pump is not stopped and it is allowed to continue running until the pump stops, and the running pump is automatically stopped until the next time the gypsum slurry density in the absorption tower is greater than 1150kg / m 3 When the standby pump is started directly, the regular switching is completed.

[0095] Further, the first preset value is 95% of the preset period, the second preset value is 100% of the preset period, and the third preset value is 5% of the preset period. Further, in this embodiment, the preset period is 168 hours.

[0096] Figure 2 1 is a structural block diagram of a periodic switching system for a gypsum discharge pump provided by an embodiment of the present invention. Figure 2 As shown, the periodic switching system of the gypsum discharge pump provided in this embodiment includes:

[0097] An interlock value determination module, used to determine a gypsum slurry density value corresponding to when the gypsum discharge pump interlock is started and a gypsum slurry density value corresponding to when the gypsum discharge pump interlock is stopped;

[0098] A calculation module is used to determine the cumulative equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump, and to determine the running time required for the gypsum discharge pump to start working from the current moment to stop running when interlocked according to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry, and the current density of the gypsum slurry;

[0099] The control module is used to determine the periodic switching strategy of the gypsum discharge pump based on the gypsum slurry density value corresponding to the interlock start of the gypsum discharge pump and the gypsum slurry density value corresponding to the interlock stop of the gypsum discharge pump, the running time required for the gypsum discharge pump to start from the current moment to the interlock stop, and the accumulated equivalent running time of the gypsum discharge pump in a preset time period, and to periodically switch the gypsum discharge pump according to the periodic switching strategy.

[0100] Specifically, the calculation module is used to determine the cumulative equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump, and to determine the running time required for the gypsum discharge pump to stop running from the current moment according to the flue gas flow rate of the original flue gas when the absorption tower treats the flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry, and the current density of the gypsum slurry, specifically:

[0101] For gypsum discharge pumps, different slurry densities have different effects on the life of the mechanical seals of gypsum discharge pumps. The greater the density of gypsum slurry, the greater the wear of the mechanical seals and the shorter the life. Therefore, if the density of gypsum slurry is large, the gypsum discharge pump can run for a shorter time. If the density is small, it can run for a longer time. In this way, the density of gypsum slurry can be used as an influencing factor to correct the cumulative running time of the gypsum discharge pump and obtain the cumulative equivalent running time of the gypsum discharge pump. This ensures that the wear degree of the mechanical seals of the two pumps is the same, so as to achieve the fundamental purpose of regular switching.

[0102] The factors that affect the operation time of the gypsum discharge pump are the slurry density of the gypsum slurry in the absorption tower;

[0103] The method of determining the accumulated equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump includes:

[0104] Determine the real-time density value of the gypsum slurry in the absorption tower at the end of the preset time period and the accumulated actual operation time of the gypsum discharge pump in the preset time period;

[0105] The accumulated equivalent running time of the gypsum discharge pump in the preset time period is calculated according to the real-time density value of the gypsum slurry at the end of the preset time period in the absorption tower and the accumulated actual running time of the gypsum discharge pump in the preset time period.

[0106] The method of calculating the accumulated equivalent running time of the gypsum discharge pump in the preset time period according to the real-time density value of the gypsum slurry at the end of the preset time period in the absorption tower and the accumulated actual running time of the gypsum discharge pump in the preset time period includes:

[0107] According to the real-time density value of the gypsum slurry at the end of the preset time period and the accumulated actual operation time of the gypsum discharge pump in the preset time period, the average relative density of the gypsum slurry during the operation of the gypsum discharge pump in the preset time period is calculated;

[0108] The accumulated equivalent running time of the gypsum discharge pump in the preset time period is calculated based on the accumulated actual running time of the gypsum discharge pump in the preset time period and the average relative density of the gypsum slurry during the operation of the gypsum discharge pump in the preset time period.

[0109] Specifically, the calculation formula for the accumulated equivalent running time of the gypsum discharge pump is as follows:

[0110] Dav=(1 / Tr)∫(D / 1150)dt;

[0111] Teq = Tr*Dav;

[0112] Where D is the real-time density of the gypsum slurry when the absorber is treating flue gas, kg / m 3 , Dav is the average relative density of the gypsum slurry during the operation of the gypsum discharge pump within the preset period, kg / m 3 , Tr is the accumulated actual running time of the gypsum discharge pump in the preset period, seconds, and Teq is the accumulated equivalent running time of the gypsum discharge pump in the preset period, seconds.

[0113] The density of the gypsum slurry in the absorption tower depends on the relationship between the SO2 concentration of the original flue gas and the flue gas flow rate of the original flue gas and the amount discharged by the gypsum discharge pump. The SO2 concentration of the original flue gas and the flue gas flow rate of the original flue gas are collected online by the DCS system (distributed control system), and the flow rate (instantaneous flow rate) discharged by the gypsum discharge pump is related to the liquid level of the absorption tower. The higher the liquid level of the absorption tower, the greater the flow rate of the gypsum discharge pump, and vice versa, the smaller the flow rate of the paste discharge pump. Therefore, the instantaneous flow rate of the gypsum discharge pump at different absorption tower liquid levels can be obtained based on the relationship curve between the pump inlet pressure head and the discharge pump flow rate provided by the gypsum discharge pump manufacturer. Specifically, in step S3, the operation time required for the gypsum discharge pump to work from the current moment to the interlocking stop is determined according to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry, and the current density of the gypsum slurry, including:

[0114] Determine the instantaneous flow rate of the gypsum discharge pump according to the current liquid level of the gypsum slurry in the absorption tower when treating flue gas;

[0115] According to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current density of the gypsum slurry and the instantaneous flow rate of the gypsum discharge pump, the operating time required for the gypsum discharge pump to work from the current moment to the interlock stop is determined.

[0116] Specifically, the calculation formula for the instantaneous flow rate of the gypsum discharge pump is:

[0117] Fdp=f(Lat); wherein, Fdp is the instantaneous flow value of the gypsum discharge pump, and Lat is the liquid level value of the gypsum slurry when the absorption tower is treating flue gas.

[0118] The calculation formula for the running time required for the gypsum discharge pump to work until the interlock stops is:

[0119] T = f(Fg, Dso2, Dgs, Fdp); T is the running time required for the gypsum discharge pump to work until the interlock stops (i.e. the gypsum discharge pump works until the gypsum slurry density is lower than 1070kg / m 3 The gypsum discharge pump needs to run for a certain period of time), Fg is the original flue gas flow rate, m 3 / h, Dso2 is the SO2 concentration of the original flue gas, mg / Nm 3 , Dgs: density of gypsum slurry in the absorption tower, kg / m 3 .

[0120] Furthermore, according to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current density of the gypsum slurry and the instantaneous flow rate of the gypsum discharge pump, the running time required for the gypsum discharge pump to work from the current moment to the interlock stop is determined, including:

[0121] Obtain historical data of the flue gas flow rate of the original flue gas in the absorption tower, the concentration of SO2 in the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump within a preset time period;

[0122] The obtained historical data of the flue gas flow rate of the original flue gas in the absorption tower, the concentration of SO2 in the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump in a preset time period are used as training samples to train the pre-built gypsum discharge pump operation time expert model to obtain a trained gypsum discharge pump operation time expert model;

[0123] The flue gas flow rate value of the original flue gas, the SO2 concentration value in the original flue gas, the current density value of the gypsum slurry and the instantaneous flow rate value of the gypsum discharge pump are obtained when the absorption tower is treating the flue gas, and the flue gas flow rate value of the original flue gas, the SO2 concentration value in the original flue gas, the current density value of the gypsum slurry and the instantaneous flow rate value of the gypsum discharge pump are input into the trained gypsum discharge pump operation time expert model when the absorption tower is treating the flue gas, and the trained gypsum discharge pump operation time expert model is used to calculate the operation time required for the gypsum discharge pump to work until the interlocking stop.

[0124] Furthermore, before using the historical data of the flue gas flow rate of the original flue gas in the absorption tower, the SO2 concentration of the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump within a preset time period as training samples to train the pre-constructed gypsum discharge pump operation time expert model, it is necessary to clean the historical data of the flue gas flow rate of the original flue gas in the absorption tower, the SO2 concentration of the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump within the preset time period in the training samples to eliminate invalid data.

[0125] The regular switching strategy of the gypsum discharge pump is:

[0126] When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is less than the first preset value, and the density of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump interlock stop, the main gypsum discharge pump currently in operation is stopped; when the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump interlock start, the main gypsum discharge pump is continued to be started;

[0127] When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is greater than or equal to the first preset value and less than the second preset value, and the density of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump interlock stop, the currently running main gypsum discharge pump is stopped; when the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump interlock start, the standby gypsum discharge pump is started;

[0128] When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is greater than or equal to the second preset value, and the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the interlock start of the gypsum discharge pump, it is determined whether the running time required for the main gypsum discharge pump currently in operation from the current moment to the interlock stop is greater than the third preset value;

[0129] Among them, if the running time required for the currently running main gypsum discharge pump from the current moment to the interlocking stop is greater than the third preset value, the currently running main gypsum discharge pump is stopped and the standby gypsum discharge pump is started; if the running time required for the currently running main gypsum discharge pump from the current moment to the interlocking stop is less than the third preset value, the currently running main gypsum discharge pump continues to work until the density value of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump when the interlocking stop is stopped, and the currently running main gypsum discharge pump is stopped; when the density value of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump when the interlocking stop is stopped, the standby gypsum discharge pump is started.

[0130] An embodiment of the present invention further provides a computer device, including: a memory, a processor, and a computer program, wherein the computer program is stored in the memory and configured to be executed by the processor to implement the above-mentioned periodic switching method of the gypsum discharge pump.

[0131] The embodiment of the present invention further provides a machine-readable storage medium having computer program instructions stored thereon, and the computer program instructions, when executed by a processor, implement the above-mentioned periodic switching method of the gypsum discharge pump.

[0132] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0133] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0134] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0135] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0136] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0137] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for periodically switching a gypsum discharge pump, characterized in that: include: Determine the density value of the gypsum slurry corresponding to when the gypsum discharge pump interlock is started and the density value of the gypsum slurry corresponding to when the gypsum discharge pump interlock is stopped; Determine the accumulated equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump; According to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry and the current density of the gypsum slurry, the running time required for the gypsum discharge pump to stop running from the current moment is determined; Determine the periodic switching strategy of the gypsum discharge pump according to the gypsum slurry density value corresponding to the start of the gypsum discharge pump interlock and the gypsum slurry density value corresponding to the stop of the gypsum discharge pump interlock, the running time required for the gypsum discharge pump to run from the current moment to the stop of the interlock, and the accumulated equivalent running time of the gypsum discharge pump in a preset time period; The gypsum discharge pump is switched periodically according to the periodic switching strategy.

2. The method for periodically switching a gypsum discharge pump according to claim 1, characterized in that: The method of determining the operation time required for the gypsum discharge pump to operate from the current moment to the interlock stop according to the flue gas flow rate of the original flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry and the current density of the gypsum slurry when the absorption tower processes the flue gas comprises: Determine the instantaneous flow rate of the gypsum discharge pump according to the current liquid level of the gypsum slurry in the absorption tower when treating flue gas; According to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current density of the gypsum slurry and the instantaneous flow rate of the gypsum discharge pump, the operating time required for the gypsum discharge pump to work from the current moment to the interlock stop is determined.

3. The method for periodically switching a gypsum discharge pump according to claim 2, characterized in that: Based on the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current density of the gypsum slurry and the instantaneous flow rate of the gypsum discharge pump, the running time required for the gypsum discharge pump to work from the current moment to the interlock stop is determined, including: Obtain historical data of the flue gas flow rate of the original flue gas in the absorption tower, the concentration of SO2 in the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump within a preset time period; The obtained historical data of the flue gas flow rate of the original flue gas in the absorption tower, the concentration of SO2 in the original flue gas, the density of the gypsum slurry, and the instantaneous flow rate of the gypsum discharge pump in a preset time period are used as training samples to train the pre-built gypsum discharge pump operation time expert model to obtain a trained gypsum discharge pump operation time expert model; The flue gas flow rate value of the original flue gas, the SO2 concentration value in the original flue gas, the current density value of the gypsum slurry and the instantaneous flow rate value of the gypsum discharge pump are obtained when the absorption tower is treating the flue gas, and the flue gas flow rate value of the original flue gas, the SO2 concentration value in the original flue gas, the current density value of the gypsum slurry and the instantaneous flow rate value of the gypsum discharge pump are input into the trained gypsum discharge pump operation time expert model when the absorption tower is treating the flue gas, and the trained gypsum discharge pump operation time expert model is used to calculate the operation time required for the gypsum discharge pump to work until the interlocking stop.

4. The method for periodically switching a gypsum discharge pump according to claim 1, characterized in that: The influencing factor affecting the operation time of the gypsum discharge pump is the slurry density of the gypsum slurry in the absorption tower; The method of determining the accumulated equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump includes: Determine the real-time density value of the gypsum slurry in the absorption tower at the end of the preset time period and the accumulated actual operation time of the gypsum discharge pump in the preset time period; The accumulated equivalent running time of the gypsum discharge pump in the preset time period is calculated according to the real-time density value of the gypsum slurry at the end of the preset time period in the absorption tower and the accumulated actual running time of the gypsum discharge pump in the preset time period.

5. The method for periodically switching a gypsum discharge pump according to claim 4, characterized in that: The method of calculating the accumulated equivalent running time of the gypsum discharge pump in the preset time period according to the real-time density value of the gypsum slurry at the end of the preset time period in the absorption tower and the accumulated actual running time of the gypsum discharge pump in the preset time period includes: According to the real-time density value of the gypsum slurry at the end of the preset time period and the accumulated actual operation time of the gypsum discharge pump in the preset time period, the average relative density of the gypsum slurry during the operation of the gypsum discharge pump in the preset time period is calculated; The accumulated equivalent running time of the gypsum discharge pump in the preset time period is calculated based on the accumulated actual running time of the gypsum discharge pump in the preset time period and the average relative density of the gypsum slurry during the operation of the gypsum discharge pump in the preset time period.

6. The method for periodically switching a gypsum discharge pump according to claim 1, characterized in that: The method of determining a periodic switching strategy of the gypsum discharge pump according to a gypsum slurry density value corresponding to when the gypsum discharge pump is interlocked and started, a gypsum slurry density value corresponding to when the gypsum discharge pump is interlocked and stopped, a running time required for the gypsum discharge pump to run from the current moment to when the interlock is stopped, and a cumulative equivalent running time of the gypsum discharge pump in a preset time period, includes: When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is less than the first preset value, and the density of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump interlock stop, the main gypsum discharge pump currently in operation is stopped; when the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump interlock start, the main gypsum discharge pump is continued to be started; When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is greater than or equal to the first preset value and less than the second preset value, and the density of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump interlock stop, the currently running main gypsum discharge pump is stopped; when the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump interlock start, the standby gypsum discharge pump is started; When the accumulated equivalent running time of the main gypsum discharge pump in the preset time period is greater than or equal to the second preset value, and the density of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the interlock start of the gypsum discharge pump, it is determined whether the running time required for the main gypsum discharge pump currently in operation from the current moment to the interlock stop is greater than the third preset value; Among them, if the running time required for the currently running main gypsum discharge pump from the current moment to the interlocking stop is greater than the third preset value, the currently running main gypsum discharge pump is stopped and the standby gypsum discharge pump is started; if the running time required for the currently running main gypsum discharge pump from the current moment to the interlocking stop is less than the third preset value, the currently running main gypsum discharge pump continues to work until the density value of the gypsum slurry in the absorption tower is less than the gypsum slurry density value corresponding to the gypsum discharge pump when the interlocking stop is stopped, and the currently running main gypsum discharge pump is stopped; when the density value of the gypsum slurry in the absorption tower is greater than the gypsum slurry density value corresponding to the gypsum discharge pump when the interlocking stop is stopped, the standby gypsum discharge pump is started.

7. The method for periodically switching a gypsum discharge pump according to claim 6, characterized in that: The first preset value is 95% of the preset period, the second preset value is 100% of the preset period, and the third preset value is 5% of the preset period.

8. A periodic switching system for a gypsum discharge pump, characterized in that: include: An interlock value determination module, used to determine a gypsum slurry density value corresponding to when the gypsum discharge pump interlock is started and a gypsum slurry density value corresponding to when the gypsum discharge pump interlock is stopped; A calculation module is used to determine the cumulative equivalent running time of the gypsum discharge pump within a preset time period according to the influencing factors of the running time of the gypsum discharge pump, and to determine the running time required for the gypsum discharge pump to start working from the current moment to stop running when interlocked according to the flue gas flow rate of the original flue gas when the absorption tower is treating the flue gas, the concentration of SO2 in the original flue gas, the current liquid level of the gypsum slurry, and the current density of the gypsum slurry; The control module is used to determine the periodic switching strategy of the gypsum discharge pump based on the gypsum slurry density value corresponding to the interlock start of the gypsum discharge pump and the gypsum slurry density value corresponding to the interlock stop of the gypsum discharge pump, the running time required for the gypsum discharge pump to start from the current moment to the interlock stop, and the accumulated equivalent running time of the gypsum discharge pump in a preset time period, and to periodically switch the gypsum discharge pump according to the periodic switching strategy.

9. A computer device, characterized in that: include: a memory storing a computer program; A processor, configured to execute the computer program to implement the periodic switching method of the gypsum discharge pump according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The computer program is executed by a processor to implement the periodic switching method of a gypsum discharge pump according to any one of claims 1 to 7.

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