Method for improving safety of steam turbine during operation of rapid cooling device

Abstract

The invention provides a method for improving the safety of a steam turbine during operation of a rapid cooling device, and relates to the technical field of steam turbine cooling, the method comprises the following steps: S1, monitoring the working temperature of a gas collection tank and the cylinder temperature of the steam turbine, and automatically executing a safety control action when the temperature of the gas collection tank or the cylinder temperature of the steam turbine is abnormal; s2, monitoring the operation data of the heater, and judging the tripping condition of the heater based on the operation data of the heater; S3, automatically executing an alarm action when the tripping of the heater is detected; and S4, whether the temperature deviation value of the gas collection tank temperature and the steam turbine cylinder temperature is within the dangerous temperature deviation range or not is judged, and if the temperature deviation value is within the dangerous temperature deviation range, the air inlet temperature is adjusted by controlling the opening degree of an air inlet valve. By monitoring the working temperature of the gas collection tank, the cylinder temperature of the steam turbine and the operation data of the heater, the tripping condition of the heater is accurately judged, and the accident that cold air enters the steam turbine is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine cooling, and in particular to a method for improving the safety of a steam turbine when a quick cooling device is running. Background Art

[0002] Rapid cooling technology has been introduced into China since the 1980s and applied to domestic 125 MW units. With the continuous increase in the capacity of domestic units, rapid cooling technology has gradually been applied to 200-600 MW units. Test data show that if the steam turbine uses air rapid cooling, as long as the required air volume is determined, the cylinder temperature drop rate can reach 10℃ / h ~ 12℃ / h. Rapid cooling within this temperature drop rate range has no effect on the life of the steam turbine. Steam and air are basically used as two cooling media for rapid cooling of steam turbines. The main cooling methods are steam cooling, compressed air cooling and vacuum cooling.

[0003] Since the current rapid cooling device does not have a monitoring method that can directly determine the tripping of the heater, when the heater trips and the operating personnel fail to discover it in time, an accident of cold air entering the turbine will occur. Summary of the invention

[0004] The present invention provides a method for improving the safety of a steam turbine when a quick cooling device is in operation, so as to solve the defect in the prior art that there is no monitoring means for directly judging the tripping of a heater, and when the heater trips and the operating personnel fail to find it in time, an accident of cold air entering the steam turbine will occur.

[0005] In one aspect, the present invention provides a method for improving the safety of a steam turbine when a rapid cooling device is in operation, comprising: Step S1: monitor the working temperature of the gas collecting box and the temperature of the steam turbine cylinder. When the temperature of the gas collecting box or the temperature of the steam turbine cylinder is abnormal, automatically execute the safety control action; Step S2: Monitor the operating data of the heater, and determine the tripping condition of the heater based on the operating data of the heater: Step S3: When the heater trips, an alarm action is automatically executed; Step S4: determine whether the temperature deviation between the air collecting box temperature and the turbine cylinder temperature is within the dangerous temperature deviation range. If the temperature deviation is within the dangerous temperature deviation range, adjust the intake temperature by controlling the opening of the intake valve.

[0006] Preferably, the safety control action includes: closing the intake valve and adjusting the intake temperature. Step S1 includes: Step S11: Check whether the working temperature of the gas collecting box is within the allowable temperature range of the gas collecting box. If the working temperature of the gas collecting box is not within the allowable temperature range of the gas collecting box, it is determined that the working temperature of the gas collecting box is abnormal. Step S12: Check whether the turbine cylinder temperature is within the allowable temperature range of the turbine cylinder temperature. If the turbine cylinder temperature is not within the allowable temperature range of the turbine cylinder temperature, determine that the turbine cylinder temperature is abnormal. Step S13: Check whether the temperature deviation value between the air collecting box temperature and the turbine cylinder temperature is within a preset temperature deviation allowable range. If the temperature deviation value is not within the temperature deviation allowable range, it is determined that the temperature deviation is abnormal. Step S14: When any of the abnormal working temperature of the gas collecting box, the abnormal cylinder temperature of the steam turbine and the abnormal temperature deviation occurs, the safety control action is automatically executed; Step S15: Regularly correct the allowable temperature range of the air collecting box and the allowable temperature range of the turbine cylinder temperature.

[0007] Preferably, step S15 includes: Step S151: determining the allowable temperature range of the turbine cylinder temperature based on the actual cylinder temperature of the turbine; Step S152: Generate the air collecting tank allowable temperature range based on the upper limit value and the lower limit value of the turbine cylinder temperature allowable temperature range.

[0008] Preferably, step 151 includes: Step S1511: taking the actual cylinder temperature of the current steam turbine as the upper limit of the allowable temperature range of the cylinder temperature of the steam turbine; Step S1512: Calculate and obtain the lower limit of the allowable temperature range of the turbine cylinder temperature; ;in, It is the lower limit of the allowable temperature range of the turbine cylinder temperature; is the actual cylinder temperature of the current steam turbine; is the maximum allowable change in turbine cylinder temperature per unit time; The interval length for correcting the allowable temperature range of the turbine cylinder temperature; Step S1513: Combine the upper limit value of the allowable temperature range of the turbine cylinder temperature and the lower limit value of the allowable temperature range of the turbine cylinder temperature to obtain the allowable temperature range of the turbine cylinder temperature.

[0009] Preferably, step 152 includes: Step S1521: determining the upper limit of the allowable temperature range of the gas collecting box; ;in, It is the upper limit of the allowable temperature range of the gas collecting box; is the actual cylinder temperature of the current steam turbine; It is the lower limit of the allowable range of temperature deviation; Step S1522: determining the lower limit of the allowable temperature range of the gas collecting box; ;in, It is the lower limit of the allowable temperature range of the gas collecting box; It is the lower limit of the allowable temperature range of the turbine cylinder temperature; It is the upper limit of the allowable range of temperature deviation; Step S1523: Combine the upper limit value of the allowable temperature range of the air collecting box and the lower limit value of the allowable temperature range of the air collecting box to obtain the allowable temperature range of the turbine cylinder temperature.

[0010] Preferably, step S2 comprises: Step S21: obtaining the operating data of the heater, the operating data of the heater including: operating current and operating temperature; Step S22: establishing a heater operation data working model with a time range length of a first time range length based on the normal operation data of the heater; Step S23: Based on the operation data of the heater within the first time range, a data group is acquired, and the tripping condition of the heater is determined based on the evaluation data group.

[0011] Preferably, step S23 includes: Step S231: intercepting the operation data of the heater within the length of the first time range, extracting the operation data of a plurality of time points at equal time intervals from the operation data of the heater as an evaluation data group, and extracting the operation data of corresponding time points from the operation data working model of the heater as a control data group; Step S232: obtaining a fluctuation evaluation result of the heater based on the evaluation data group; ;in, is the fluctuation evaluation result of the heater; N is the total number of operating data groups in the evaluation data group; G is the maximum allowable deviation ratio of the heater's operating data change ratio; The i-th group of running data in the evaluation data group; Run the data for the i-1th group in the evaluation data group; is the i-th group of running data in the comparison data group; Run the data for the i-1th group in the comparison data group; is the rounding symbol; Step S232: generating a predicted value of heater operation data after a specified length of time based on the evaluation data group; ; in, is the predicted value of the heater operation data; N is the total number of operation data groups in the evaluation data group; The length of the time interval between the time point of the i-1th group of running data and the initial time point; The i-th group of running data in the evaluation data group; is the length of the time interval between the predicted time point and the initial time point; Step S233: determining whether the predicted value of the heater operation data is within the allowable range of the corresponding operation data, and obtaining the predicted evaluation result of the heater; If the predicted value of the heater operation data is within the allowable range of the corresponding operation data, the predicted evaluation result of the heater is calculated based on the following formula; ;in, is the predicted evaluation result of the heater; min is the minimum function; The upper limit of the permissible range of the operating data; It is the lower limit of the permissible range of the operating data; If the predicted value of the heater operation data is not within the allowable range of the corresponding operation data, the predicted evaluation result of the heater is taken as 10.

[0012] Step S233: obtaining a comprehensive evaluation result of the heater based on the fluctuation evaluation result of the heater and the prediction evaluation result of the heater; ;in, This is the comprehensive evaluation result of the heater; are weighted calculation coefficients for the fluctuation evaluation result of the heater and the prediction evaluation result of the heater, respectively; If the comprehensive evaluation result of the heater is less than the preset tripping threshold, it is determined that the heater has not tripped, otherwise, it is determined that the heater has tripped.

[0013] Preferably, the alarm action includes a first warning action and a second warning action; step S3 includes: Step S31: When the tripping condition of the heater is tripped, a first warning action is executed, wherein the first warning action is: displaying a heater tripping warning message on the monitoring system interface, and sounding an alarm through an alarm audio device in the control room; Step S32: If no warning termination instruction is received manually input by the staff within the first specified time length after the first warning action is executed, the second warning action is executed, and the second warning action is: sending a fault notification to the designated mailbox and the mobile communication device of the designated manager.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By monitoring the operating temperature of the air collecting box, the turbine cylinder temperature and the operating data of the heater, the tripping condition of the heater can be accurately judged, so that the operating personnel can be warned in time after the heater trips, avoiding the accident of cold air entering the turbine and improving the safety of the turbine during cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 is a schematic diagram of the process of this method. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0019] Example 1 An embodiment of the present invention provides a method for improving the safety of a steam turbine when a rapid cooling device is in operation, comprising: Step S1: monitor the working temperature of the gas collecting box and the temperature of the steam turbine cylinder. When the temperature of the gas collecting box or the temperature of the steam turbine cylinder is abnormal, automatically execute the safety control action; Step S2: Monitor the operating data of the heater, and determine the tripping condition of the heater based on the operating data of the heater: Step S3: When the heater trips, an alarm action is automatically executed; Step S4: determine whether the temperature deviation between the air collecting box temperature and the turbine cylinder temperature is within the dangerous temperature deviation range. If the temperature deviation is within the dangerous temperature deviation range, adjust the intake temperature by controlling the opening of the intake valve.

[0020] The beneficial effects of the above technical solution are: By monitoring the operating temperature of the air collecting box and the temperature of the turbine cylinder, the safety control action can be automatically triggered, so that automatic adjustment can be achieved when a failure occurs in the fast cooling device, effectively improving the safety of the turbine during cooling and avoiding the occurrence of cold air inlet accidents to the turbine.

[0021] By monitoring the operating data of the heater, it is possible to determine whether the heater has tripped. When the heater has tripped, an alarm will be issued in a timely manner to help operating personnel detect signs of heater tripping earlier, so that preventive measures can be taken to avoid accidents.

[0022] When the air box temperature deviates greatly from the cylinder temperature (but is still within the allowable range of temperature deviation), the intake air temperature is automatically adjusted to ensure that the system can maintain stable temperature control under different operating conditions and prevent safety problems caused by excessive temperature deviation.

[0023] Example 2 On the basis of embodiment 1, the safety control action includes: closing the intake valve and adjusting the intake air temperature. Step S1 includes: Step S11: Check whether the working temperature of the gas collecting box is within the allowable temperature range of the gas collecting box. If the working temperature of the gas collecting box is not within the allowable temperature range of the gas collecting box, it is determined that the working temperature of the gas collecting box is abnormal. Step S12: Check whether the turbine cylinder temperature is within the allowable temperature range of the turbine cylinder temperature. If the turbine cylinder temperature is not within the allowable temperature range of the turbine cylinder temperature, determine that the turbine cylinder temperature is abnormal. Step S13: Check whether the temperature deviation value between the air collecting box temperature and the turbine cylinder temperature is within a preset temperature deviation allowable range. If the temperature deviation value is not within the temperature deviation allowable range, it is determined that the temperature deviation is abnormal. Step S14: When any of the abnormal working temperature of the gas collecting box, the abnormal cylinder temperature of the steam turbine and the abnormal temperature deviation occurs, the safety control action is automatically executed; Step S15: Regularly correct the allowable temperature range of the air collecting box and the allowable temperature range of the turbine cylinder temperature.

[0024] Preferably, step S15 includes: Step S151: determining the allowable temperature range of the turbine cylinder temperature based on the actual cylinder temperature of the turbine; Step S152: Generate the air collecting tank allowable temperature range based on the upper limit value and the lower limit value of the turbine cylinder temperature allowable temperature range.

[0025] Preferably, step 151 includes: Step S1511: taking the actual cylinder temperature of the current steam turbine as the upper limit of the allowable temperature range of the cylinder temperature of the steam turbine; Step S1512: Calculate and obtain the lower limit of the allowable temperature range of the turbine cylinder temperature; ;in, It is the lower limit of the allowable temperature range of the turbine cylinder temperature; is the actual cylinder temperature of the current steam turbine; is the maximum allowable change in turbine cylinder temperature per unit time; The interval length for correcting the allowable temperature range of the turbine cylinder temperature; Step S1513: Combine the upper limit value of the allowable temperature range of the turbine cylinder temperature and the lower limit value of the allowable temperature range of the turbine cylinder temperature to obtain the allowable temperature range of the turbine cylinder temperature.

[0026] Preferably, step 152 includes: Step S1521: determining the upper limit of the allowable temperature range of the gas collecting box; ;in, It is the upper limit of the allowable temperature range of the gas collecting box; is the actual cylinder temperature of the current steam turbine; It is the lower limit of the allowable range of temperature deviation; Step S1522: determining the lower limit of the allowable temperature range of the gas collecting box; ;in, It is the lower limit of the allowable temperature range of the gas collecting box; It is the lower limit of the allowable temperature range of the turbine cylinder temperature; It is the upper limit of the allowable range of temperature deviation; Step S1523: Combine the upper limit value of the allowable temperature range of the air collecting box and the lower limit value of the allowable temperature range of the air collecting box to obtain the allowable temperature range of the turbine cylinder temperature.

[0027] In this embodiment, the maximum allowable change value of the turbine cylinder temperature refers to the maximum allowable decrease in the cylinder temperature change value within a unit time under the condition of ensuring that the service life of the turbine is not affected.

[0028] The beneficial effects of the above technical solution are: By respectively verifying whether the working temperature of the air collecting box is within the allowable temperature range of the air collecting box, whether the turbine cylinder temperature is within the allowable temperature range of the turbine cylinder temperature, and whether the temperature deviation value of the air collecting box temperature and the turbine cylinder temperature is within the preset allowable temperature deviation range, the rationality of the working temperature of the air collecting box and the turbine cylinder temperature is comprehensively verified, thereby improving the comprehensiveness of monitoring the working temperature of the air collecting box and the turbine cylinder temperature, and effectively improving the safety of the turbine during cooling.

[0029] By regularly correcting the allowable temperature range of the air collecting box and the allowable temperature range of the turbine cylinder temperature, the allowable temperature range of the air collecting box and the allowable temperature range of the turbine cylinder temperature are highly matched with the actual cooling state of the turbine, thereby improving the accuracy of monitoring the operating temperature of the air collecting box and the turbine cylinder temperature, and effectively improving the safety of the turbine during cooling.

[0030] Example 3 Based on any one of Embodiments 1-2, step S2 comprises: Step S21: obtaining the operating data of the heater, the operating data of the heater including: operating current and operating temperature; Step S22: establishing a heater operation data working model with a time range length of a first time range length based on the normal operation data of the heater; Step S23: Based on the operation data of the heater within the first time range, a data group is acquired, and the tripping condition of the heater is determined based on the evaluation data group.

[0031] Preferably, step S23 includes: Step S231: intercepting the operation data of the heater within the length of the first time range, extracting the operation data of a plurality of time points at equal time intervals from the operation data of the heater as an evaluation data group, and extracting the operation data of corresponding time points from the operation data working model of the heater as a control data group; Step S232: obtaining a fluctuation evaluation result of the heater based on the evaluation data group; ;in, is the fluctuation evaluation result of the heater; N is the total number of operating data groups in the evaluation data group; G is the maximum allowable deviation ratio of the heater's operating data change ratio; The i-th group of running data in the evaluation data group; Run the data for the i-1th group in the evaluation data group; is the i-th group of running data in the comparison data group; Run the data for the i-1th group in the comparison data group; is the rounding symbol; Step S232: generating a predicted value of heater operation data after a specified length of time based on the evaluation data group; ; in, is the predicted value of the heater operation data; N is the total number of operation data groups in the evaluation data group; The length of the time interval between the time point of the i-1th group of running data and the initial time point; The i-th group of running data in the evaluation data group; is the length of the time interval between the predicted time point and the initial time point; Step S233: determining whether the predicted value of the heater operation data is within the allowable range of the corresponding operation data, and obtaining the predicted evaluation result of the heater; If the predicted value of the heater operation data is within the allowable range of the corresponding operation data, the predicted evaluation result of the heater is calculated based on the following formula; ;in, is the predicted evaluation result of the heater; min is the minimum function; The upper limit of the permissible range of the operating data; It is the lower limit of the permissible range of the operating data; If the predicted value of the heater operation data is not within the allowable range of the corresponding operation data, the predicted evaluation result of the heater is taken as 10.

[0032] Step S233: obtaining a comprehensive evaluation result of the heater based on the fluctuation evaluation result of the heater and the prediction evaluation result of the heater; ;in, This is the comprehensive evaluation result of the heater; are weighted calculation coefficients for the fluctuation evaluation result of the heater and the prediction evaluation result of the heater, respectively; If the comprehensive evaluation result of the heater is less than the preset tripping threshold, it is determined that the heater has not tripped, otherwise, it is determined that the heater has tripped.

[0033] In this embodiment, the initial time point refers to the time point corresponding to the first group of operating data.

[0034] The beneficial effects of the above technical solution are: By judging the fluctuation assessment results of the heater, the degree of consistency between the heater operating data and the operating data working model is evaluated, thereby judging the stability of the heater working state. By calculating the predicted value of the heater operating data after a certain period of time, an early warning can be given before the actual deviation of the heater operating data occurs, thereby making targeted adjustments in advance, reducing the number of actual deviations in the heater operating data and improving the safety of the turbine during cooling.

[0035] pass Calculate the degree of consistency between the actual operation data change trend and the change trend at the corresponding time point in the operation data working model, and then The total number of groups of operating data that meet the synchronization requirements (the degree of asynchrony is less than a preset threshold) is calculated, and then the proportion of operating data that meet the synchronization requirements is calculated, and finally the fluctuation evaluation result of the heater is obtained, which improves the accuracy of the fluctuation evaluation result of the heater.

[0036] By comprehensively considering the fluctuation evaluation results and the predicted evaluation results of the heater, the stability of the heater's operating state is evaluated from two dimensions: the current operating state and the predicted operating state. This can provide an early warning of the heater's operating hazards before the heater's operating data actually deviates, thereby reducing the probability of actual deviations in the heater's operating data and effectively improving the safety of the turbine during cooling.

[0037] Example 4 On the basis of any one of Embodiments 1-3, the alarm action includes a first warning action and a second warning action; step S3 includes: Step S31: When the tripping condition of the heater is tripped, a first warning action is executed, wherein the first warning action is: displaying a heater tripping warning message on the monitoring system interface, and sounding an alarm through an alarm audio device in the control room; Step S32: If no warning termination instruction is received manually input by the staff within the first specified time length after the first warning action is executed, the second warning action is executed, and the second warning action is: sending a fault notification to the designated mailbox and the mobile communication device of the designated manager.

[0038] The beneficial effects of the above technical solution are: By triggering the first warning action and the second warning action in sequence, it is ensured that the alarm can be effectively transmitted to the designated management personnel, ensuring that they can discover and deal with the problem in time, effectively improving the safety of turbine cooling.

[0039] The second warning action is triggered only when no warning termination instruction manually input by the staff is received within the first specified time length after the first warning action is executed, thereby avoiding the waste of communication resources and maintaining the high alertness of the staff to the second warning action.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for improving the safety of a steam turbine when a rapid cooling device is in operation, characterized in that: include: Step S1: monitor the working temperature of the gas collecting box and the temperature of the steam turbine cylinder. When the temperature of the gas collecting box or the temperature of the steam turbine cylinder is abnormal, automatically execute the safety control action; Step S2: Monitor the operating data of the heater, and determine the tripping condition of the heater based on the operating data of the heater: Step S3: When the heater trips, an alarm action is automatically executed; Step S4: Determine whether the temperature deviation between the air collecting box temperature and the turbine cylinder temperature is within a dangerous temperature deviation range. If the temperature deviation is within the dangerous temperature deviation range, adjust the intake temperature by controlling the opening of the intake valve.

2. A method for improving the safety of a steam turbine during operation of a rapid cooling device according to claim 1, characterized in that: The safety control actions include: closing the intake valve and adjusting the intake air temperature. Step S1 includes: Step S11: Check whether the working temperature of the gas collecting box is within the allowable temperature range of the gas collecting box. If the working temperature of the gas collecting box is not within the allowable temperature range of the gas collecting box, it is determined that the working temperature of the gas collecting box is abnormal. Step S12: Check whether the turbine cylinder temperature is within the allowable temperature range of the turbine cylinder temperature. If the turbine cylinder temperature is not within the allowable temperature range of the turbine cylinder temperature, determine that the turbine cylinder temperature is abnormal. Step S13: Check whether the temperature deviation value between the air collecting box temperature and the turbine cylinder temperature is within a preset temperature deviation allowable range. If the temperature deviation value is not within the temperature deviation allowable range, it is determined that the temperature deviation is abnormal. Step S14: When any of the abnormal working temperature of the gas collecting box, the abnormal cylinder temperature of the steam turbine and the abnormal temperature deviation occurs, the safety control action is automatically executed; Step S15: Regularly correct the allowable temperature range of the air collecting box and the allowable temperature range of the turbine cylinder temperature.

3. A method for improving the safety of a steam turbine during operation of a rapid cooling device according to claim 2, characterized in that: Step S15 includes: Step S151: determining the allowable temperature range of the turbine cylinder temperature based on the actual cylinder temperature of the turbine; Step S152: Generate the air collecting tank allowable temperature range based on the upper limit value and the lower limit value of the turbine cylinder temperature allowable temperature range.

4. A method for improving the safety of a steam turbine during operation of a rapid cooling device according to claim 3, characterized in that: Step 151 includes: Step S1511: taking the actual cylinder temperature of the current steam turbine as the upper limit of the allowable temperature range of the cylinder temperature of the steam turbine; Step S1512: Calculate and obtain the lower limit of the allowable temperature range of the turbine cylinder temperature; ;in, It is the lower limit of the allowable temperature range of the turbine cylinder temperature; is the actual cylinder temperature of the current steam turbine; is the maximum allowable change in turbine cylinder temperature per unit time; The interval length for correcting the allowable temperature range of the turbine cylinder temperature; Step S1513: Combine the upper limit value of the allowable temperature range of the turbine cylinder temperature and the lower limit value of the allowable temperature range of the turbine cylinder temperature to obtain the allowable temperature range of the turbine cylinder temperature.

5. A method for improving the safety of a steam turbine during operation of a rapid cooling device according to claim 4, characterized in that: Step 152 includes: Step S1521: determining the upper limit of the allowable temperature range of the gas collecting box; ;in, It is the upper limit of the allowable temperature range of the gas collecting box; is the actual cylinder temperature of the current steam turbine; It is the lower limit of the allowable range of temperature deviation; Step S1522: determining the lower limit of the allowable temperature range of the gas collecting box; ;in, It is the lower limit of the allowable temperature range of the gas collecting box; It is the lower limit of the allowable temperature range of the turbine cylinder temperature; It is the upper limit of the allowable range of temperature deviation; Step S1523: Combine the upper limit value of the allowable temperature range of the air collecting box and the lower limit value of the allowable temperature range of the air collecting box to obtain the allowable temperature range of the turbine cylinder temperature.

6. The method for improving the safety of a steam turbine during operation of a rapid cooling device according to claim 1, characterized in that: Step S2 includes: Step S21: obtaining the operating data of the heater, the operating data of the heater including: operating current and operating temperature; Step S22: establishing a heater operation data working model with a time range length of a first time range length based on the normal operation data of the heater; Step S23: Based on the operation data of the heater within the first time range, a data group is acquired, and the tripping condition of the heater is determined based on the evaluation data group.

7. A method for improving the safety of a steam turbine during operation of a rapid cooling device according to claim 6, characterized in that: Step S23 includes: Step S231: intercepting the operation data of the heater within the length of the first time range, extracting the operation data of a plurality of time points at equal time intervals from the operation data of the heater as an evaluation data group, and extracting the operation data of corresponding time points from the operation data working model of the heater as a control data group; Step S232: obtaining a fluctuation evaluation result of the heater based on the evaluation data group; ;in, is the fluctuation evaluation result of the heater; N is the total number of operating data groups in the evaluation data group; G is the maximum allowable deviation ratio of the heater's operating data change ratio; The i-th group of running data in the evaluation data group; Run the data for the i-1th group in the evaluation data group; is the i-th group of running data in the comparison data group; Run the data for the i-1th group in the comparison data group; is the rounding symbol; Step S232: generating a predicted value of heater operation data after a specified length of time based on the evaluation data group; ； in, is the predicted value of the heater operation data; N is the total number of operation data groups in the evaluation data group; is the time interval between the time point of the i-1th group of running data and the initial time point; The i-th group of running data in the evaluation data group; is the length of the time interval between the predicted time point and the initial time point; Step S233: determining whether the predicted value of the heater operation data is within the allowable range of the corresponding operation data, and obtaining the predicted evaluation result of the heater; If the predicted value of the heater operation data is within the allowable range of the corresponding operation data, the predicted evaluation result of the heater is calculated based on the following formula; ;in, is the predicted evaluation result of the heater; min is the minimum function; The upper limit of the permissible range of the operating data; It is the lower limit of the permissible range of the operating data; If the predicted value of the heater operation data is not within the allowable range of the corresponding operation data, the predicted evaluation result of the heater is taken as 10; Step S233: obtaining a comprehensive evaluation result of the heater based on the fluctuation evaluation result of the heater and the prediction evaluation result of the heater; ;in, This is the comprehensive evaluation result of the heater; are weighted calculation coefficients for the fluctuation evaluation result of the heater and the prediction evaluation result of the heater, respectively; If the comprehensive evaluation result of the heater is less than the preset tripping threshold, it is determined that the heater has not tripped, otherwise, it is determined that the heater has tripped.

8. The method for improving the safety of a steam turbine during operation of a rapid cooling device according to claim 1, characterized in that: The alarm action includes a first warning action and a second warning action; step S3 includes: Step S31: When the tripping condition of the heater is tripped, a first warning action is executed, wherein the first warning action is: displaying a heater tripping warning message on the monitoring system interface, and sounding an alarm through an alarm audio device in the control room; Step S32: If no warning termination instruction is received manually input by the staff within the first specified time length after the first warning action is executed, the second warning action is executed, and the second warning action is: sending a fault notification to the designated mailbox and the mobile communication device of the designated manager.

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