Safety control system and method for high-temperature steam generator

Abstract

The invention relates to the field of steam generators, in particular to a safety control system and method for a high-temperature steam generator, and aims to solve the problems that potential safety hazards exist in operation of the steam generator due to insufficient supervision factors during safety supervision of the steam generator and potential pressure rebound hazards are caused during emergency pressure relief. Comprising a pressure monitoring unit, a pressure comprehensive analysis unit, a pressure evaluation unit, a safety control unit and a liquid parameter monitoring unit, according to the invention, through multi-factor supervision and analysis of the pressure condition and the pressure fluctuation condition in the operation process of the steam generator, different alarm prompts are generated, and different safety control means are started, so that the safety control in the operation process of the steam generator is ensured, and in the emergency pressure relief control process of the steam generator, the safety of the steam generator is ensured. The pressure relief speed is controlled according to liquid and gas parameters in the steam generator, the phenomenon of pressure rebound caused by too high pressure relief speed is avoided, and the operation safety of the steam generator is improved.

Description

Technical Field

[0001] The present invention relates to the field of steam generators, and in particular to a safety control system and method for a high-temperature steam generator. Background Art

[0002] Steam generator, also called steam heat source machine, is a mechanical device that uses the thermal energy of fuel or other energy sources to heat water into hot water or steam. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives, or can be converted into mechanical energy through a steam power device, or converted into electrical energy through a generator;

[0003] In the process of steam utilization, the steam pipeline system plays an irreplaceable role in energy conversion. However, due to the extreme conditions of the operating environment and the large scale of the system, the steam pipeline system faces a series of safety challenges, including high temperature and high pressure working conditions, pipeline corrosion, temperature anomalies, pressure fluctuations and other issues. In order to ensure the safety and reliability of steam pipelines and steam vessels, steam generator safety supervision has become a critical area of ​​concern;

[0004] At present, during the operation of steam generators in the prior art, most of them perform simple threshold control on the steam pressure, that is, when the current steam pressure reaches a certain limit, the pressure relief work is carried out, and when the steam pressure does not reach the limit, the work continues. However, in the process of generating and transporting steam pressure, there are many factors affecting it, including the fluctuation shock caused by pressure fluctuation, metal fatigue, etc. Therefore, simple limit control cannot meet the safety indicators of the steam generator during operation. At the same time, when the steam generator is performing pressure relief work, the sudden change of air pressure inside it may cause the boiling point of the liquid to change, thereby causing more serious violent boiling and pressure rebound, resulting in serious consequences.

[0005] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0006] In the present invention, through multi-factor supervision and analysis of the pressure conditions and pressure fluctuations during the operation of the steam generator, different alarm reminders are generated and different safety control measures are enabled, thereby ensuring that the steam generator safety control system can comprehensively investigate and eliminate operational hazards, and in the emergency pressure relief control process of the steam generator, the pressure relief speed is controlled according to the liquid and gas parameters in the steam generator to avoid the pressure rebound phenomenon caused by excessively fast pressure relief speed, thereby improving the operational safety of the steam generator, solving the problem of insufficient supervision factors during the safety supervision of the steam generator leading to operational safety hazards in the steam generator and the pressure rebound hazard caused by emergency pressure relief, and proposing a high-temperature steam generator safety control system and method.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A high-temperature steam generator safety control system includes a pressure monitoring unit, which collects and pre-processes the pressure of a container in the steam generator to obtain a valid data set and an operating pressure;

[0009] A pressure comprehensive analysis unit, which extracts and analyzes data based on the preprocessed valid data set, generates the pressure fluctuation amplitude and the over-limit situation of the pressure fluctuation upper limit, and makes an assessment based on the operating pressure to determine the operating pressure over-pressure situation;

[0010] A pressure assessment unit, which performs combined analysis based on pressure fluctuations and overpressure conditions to generate pressure fluctuation warnings and overpressure warnings;

[0011] A safety control unit, which executes safety control measures on the steam generator according to the pressure fluctuation warning and the overpressure warning;

[0012] The liquid parameter monitoring unit monitors the pressure and liquid data in the steam generator when the steam generator is depressurized, thereby controlling the depressurization process.

[0013] As a preferred embodiment of the present invention, the pressure monitoring unit collects the container pressures collected multiple times and arranges the collected container pressures in numerical order to obtain a container pressure sequence;

[0014] The pressure monitoring unit extracts data accounting for X% at both ends of the container pressure sequence and records them as a pending sequence, records the container pressure sequence after removing the pending sequence as a preprocessed pressure sequence and performs arithmetic averaging to obtain a preprocessed mean, and the pressure monitoring unit compares each container pressure in the pending sequence with the preprocessed mean to obtain a pending ratio, and the pressure monitoring unit performs a threshold judgment on the pending ratio, and deletes or retains the corresponding container pressure according to the judgment result.

[0015] As a preferred embodiment of the present invention, the pressure monitoring unit summarizes the container pressures in the preprocessed pressure sequence and the container pressures retained in the pending sequence into a valid data set, performs arithmetic averaging on the valid data set to obtain the operating pressure, and sends the operating pressure to the pressure comprehensive analysis unit.

[0016] As a preferred embodiment of the present invention, after acquiring the operating pressure, the comprehensive pressure analysis unit compares the operating pressure with a set pressure threshold, and generates an overpressure signal or a normal pressure signal according to the comparison result.

[0017] As a preferred embodiment of the present invention, after acquiring the normal pressure signal, the pressure comprehensive analysis unit analyzes the fluctuation value of the operating pressure to obtain the upper and lower limits of the fluctuation operation, and the pressure comprehensive analysis unit performs a threshold analysis according to the upper limit of the fluctuation operation, and generates a fluctuation over-limit signal or a fluctuation normal signal according to the analysis result;

[0018] The pressure comprehensive analysis unit performs a formula analysis on the pressure fluctuation amplitude and the operating pressure to generate a pressure danger value. If the pressure danger value exceeds a set threshold, a pressure high-risk signal is generated. If the pressure danger value does not exceed the set threshold, a pressure low-risk signal is generated.

[0019] As a preferred embodiment of the present invention, the process of the comprehensive pressure analysis unit analyzing the fluctuation value of the operating pressure is as follows:

[0020] The pressure comprehensive analysis unit calculates the standard deviation of the container pressure in the valid data set, uses the obtained standard deviation as the pressure fluctuation amplitude of the operating pressure, and records the maximum value and minimum value in the valid data as the fluctuation operation upper limit and the fluctuation operation lower limit respectively.

[0021] As a preferred embodiment of the present invention, the pressure assessment unit generates a fluctuation warning after obtaining a high-risk pressure signal, generates an overpressure warning after generating an overpressure signal and a fluctuation exceeding limit signal, and sends the fluctuation warning and overpressure warning to the safety control unit;

[0022] After obtaining the overpressure warning, the safety control unit reduces the operating power of the steam generator and starts the pressure relief valve of the steam generator;

[0023] The safety control unit stops the operation of the steam generator after obtaining the fluctuation warning.

[0024] As a preferred embodiment of the present invention, when the safety control unit releases pressure on the steam generator, it sends a pressure relief instruction to the liquid parameter monitoring unit. After receiving the pressure relief instruction, the liquid parameter monitoring unit immediately collects the liquid temperature and container pressure in the steam generator and records them as the initial temperature and initial pressure. The liquid parameter monitoring unit always monitors the container pressure during the pressure relief process, calculates the difference between the continuously obtained container pressure and the initial pressure to obtain the pressure relief pressure, records the duration of the pressure relief as the pressure relief time, and obtains the pressure relief speed by performing a proportional calculation between the pressure relief pressure and the pressure relief time.

[0025] The liquid parameter monitoring unit analyzes the pressure relief speed and the initial temperature according to a formula to obtain a pressure relief value. The liquid parameter monitoring unit compares the pressure relief value with a set threshold value. If the pressure relief value is greater than the set threshold value, a pressure relief too fast signal is generated and the pressure relief speed is reduced. If the pressure relief value is less than or equal to the set threshold value, no response is made.

[0026] A high-temperature steam generator safety control method comprises the following steps:

[0027] Step 1: Container pressure data collection and valid data determination;

[0028] Step 2: Extraction of operating pressure and its fluctuation data;

[0029] Step 3: Analysis of pressure conditions and fluctuation thresholds;

[0030] Step 4: Generate early warning signals;

[0031] Step 5: Automatic safety control;

[0032] Step 6: Pressure relief speed control.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. In the present invention, multi-factor supervision and analysis of the pressure conditions and pressure fluctuations during the operation of the steam generator is realized, and different alarm reminders are generated according to different supervision conditions. At the same time, different safety control measures are enabled to ensure that during the operation of the steam generator, the safety control system can comprehensively check and eliminate operating hazards, thereby improving the operating safety of the steam generator.

[0035] 2. In the present invention, during the emergency pressure relief control process of the steam generator, a comprehensive analysis of the liquid and gas parameters in the steam generator is achieved, so as to control the pressure relief speed, avoid the pressure rebound phenomenon caused by too fast pressure relief speed, and prevent the steam generator and its affiliated pipelines from being shaken or even exploded or damaged due to the instantaneous pressure rebound.

[0036] 3. In the present invention, the data collected from the operation of the steam generator are collected and collated to achieve rationality analysis of the collected data, ensure the accuracy of the collected data, and improve the scientific nature of the subsequent safety control process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0038] Figure 1 is a system block diagram of the present invention;

[0039] Figure 2 is a system flow chart of the present invention;

[0040] Figure 3 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0041] The technical scheme of the present invention will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Embodiment 1:

[0043] See also Figure 1 - Figure 3 As shown, a high-temperature steam generator safety control system includes a pressure monitoring unit, a pressure comprehensive analysis unit, a pressure evaluation unit, a safety control unit and a liquid parameter monitoring unit;

[0044] The pressure monitoring unit collects the steam pressure in the high-temperature steam generator and records the collected steam pressure as the container pressure. The pressure monitoring unit collects the container pressures collected multiple times and arranges the collected container pressures in order of numerical values ​​to obtain a container pressure sequence.

[0045] The pressure monitoring unit extracts data accounting for X% of both ends of the container pressure sequence, records the data accounting for X% of both ends as a pending sequence, records the container pressure sequence after removing the pending sequence as a preprocessing pressure sequence, and performs arithmetic averaging on the container pressures in the preprocessing pressure sequence to obtain a preprocessing mean value. The pressure monitoring unit compares each container pressure in the pending sequence with the preprocessing mean value to obtain a pending ratio. The pressure monitoring unit performs a threshold judgment on the pending ratio. If the pending ratio is greater than a set upper limit of the ratio threshold or less than a set lower limit of the ratio threshold, the corresponding container pressure is deleted. If the pending ratio is between the set upper and lower limits of the ratio threshold, the corresponding container pressure is retained.

[0046] The pressure monitoring unit summarizes the container pressure in the pre-processing pressure sequence and the container pressure retained in the pending sequence into a valid data set, performs arithmetic averaging on the valid data set to obtain the operating pressure, and sends the operating pressure to the pressure comprehensive analysis unit;

[0047] After the pressure comprehensive analysis unit obtains the operating pressure, it compares the operating pressure with the set pressure threshold. If the operating pressure is greater than the set pressure threshold, an overpressure signal is generated; if the operating pressure is less than or equal to the set pressure threshold, a normal pressure signal is generated;

[0048] After obtaining the normal pressure signal, the pressure comprehensive analysis unit analyzes the fluctuation value of the operating pressure to obtain the upper and lower limits of the fluctuation operation. The pressure comprehensive analysis unit performs a threshold analysis based on the upper limit of the fluctuation operation. If the upper limit of the fluctuation does not exceed the set threshold, a fluctuation over-limit signal is generated. If the upper limit of the fluctuation does not exceed the set threshold, a fluctuation normal signal is generated.

[0049] The process of the pressure comprehensive analysis unit analyzing the fluctuation value of the operating pressure is as follows:

[0050] The pressure comprehensive analysis unit obtains a valid data set through the pressure monitoring unit, calculates the standard deviation of the container pressure in the valid data set, uses the obtained standard deviation as the pressure fluctuation amplitude of the operating pressure, and records the maximum value and minimum value in the valid data as the fluctuation operation upper limit and the fluctuation operation lower limit respectively;

[0051] The comprehensive pressure analysis unit analyzes the pressure fluctuation amplitude and the operating pressure according to a formula to generate a pressure danger value PW, PW = Py + q * Pb, where Py is the operating pressure, Pb is the pressure fluctuation amplitude, and q is the set weight coefficient. The pressure fluctuation amplitude is expanded to a certain extent by the weight coefficient, thereby obtaining a safe prediction of the pressure fluctuation. If the pressure danger value exceeds the set threshold, a high-risk pressure signal is generated. If the pressure danger value does not exceed the set threshold, a low-risk pressure signal is generated.

[0052] Embodiment 2:

[0053] See also Figure 1 - Figure 3 As shown, the pressure assessment unit obtains a high-risk pressure signal, a fluctuation exceeding limit signal or an overpressure signal through the pressure comprehensive analysis unit. After obtaining the high-risk pressure signal, the pressure assessment unit generates a fluctuation warning, and after generating an overpressure signal and a fluctuation exceeding limit signal, generates an overpressure warning, and sends the fluctuation warning and overpressure warning to the safety control unit;

[0054] After receiving the overpressure warning, the safety control unit will issue an alarm through the sound and light alarm device, reduce the operating power of the steam generator, and operate the pressure relief valve of the steam generator to relieve the pressure in the steam generator. After the pressure relief is completed, the pressure relief valve in the steam generator is closed and the operating power of the steam generator is restored;

[0055] After receiving the fluctuation warning, the safety control unit will issue an alarm reminder through the sound and light alarm equipment, stop the operation of the steam generator, and issue a maintenance and inspection reminder.

[0056] When the safety control unit releases the pressure of the steam generator, it sends a pressure relief instruction to the liquid parameter monitoring unit. After receiving the pressure relief instruction, the liquid parameter monitoring unit immediately collects the liquid temperature and container pressure in the steam generator and records them as the initial temperature and initial pressure. The liquid parameter monitoring unit always monitors the container pressure during the pressure relief process, calculates the difference between the continuously obtained container pressure and the initial pressure to obtain the pressure relief pressure, records the duration of the pressure relief as the pressure relief time, and obtains the pressure relief speed by performing a proportional calculation between the pressure relief pressure and the pressure relief time.

[0057] The liquid parameter monitoring unit uses a formula to analyze the pressure relief speed and initial temperature to obtain the pressure relief value PX. Where T is the initial temperature, V is the pressure relief speed, k is the set weight coefficient, and the liquid parameter monitoring unit compares the pressure relief value with the set threshold value. If the pressure relief value is greater than the set threshold value, a pressure relief signal is generated and the pressure relief speed is reduced. If the pressure relief value is less than or equal to the set threshold value, no response is made to avoid the pressure in the container dropping suddenly due to the pressure relief speed being too fast, thereby causing the boiling point of the liquid to drop and cause violent boiling.

[0058] Embodiment three:

[0059] See also Figure 1 - Figure 3 As shown, a high-temperature steam generator safety control method comprises the following steps:

[0060] Step 1: Collect the container pressure in the steam generator, and perform special preprocessing analysis on the collected container pressure to eliminate unreasonable data and obtain a valid data set;

[0061] Step 2: Extract and utilize the valid data set to obtain the operating pressure and pressure fluctuation related data;

[0062] Step 3: Analyze the operating pressure and pressure fluctuation to determine the pressure overpressure and pressure fluctuation;

[0063] Step 4: Coordinate the overpressure and pressure fluctuation conditions to generate an overpressure warning or fluctuation warning;

[0064] Step 5: Take corresponding automatic control measures for the operation of the steam generator according to the overpressure warning or fluctuation warning to ensure the safe operation of the steam generator;

[0065] Step 6: Monitor the container pressure and liquid temperature during the pressure relief process of the steam generator, control the pressure relief rate, and avoid liquid boiling.

[0066] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-temperature steam generator safety control system, characterized in that: It includes a pressure monitoring unit, which collects and pre-processes the pressure of the container in the steam generator to obtain a valid data set and an operating pressure; A pressure comprehensive analysis unit, which extracts and analyzes data based on the preprocessed valid data set, generates the pressure fluctuation amplitude and the over-limit situation of the pressure fluctuation upper limit, and makes an assessment based on the operating pressure to determine the operating pressure over-pressure situation; A pressure assessment unit, which performs combined analysis based on pressure fluctuations and overpressure conditions to generate pressure fluctuation warnings and overpressure warnings; A safety control unit, which executes safety control measures on the steam generator according to the pressure fluctuation warning and the overpressure warning; The liquid parameter monitoring unit monitors the pressure and liquid data in the steam generator when the steam generator is depressurized, thereby controlling the depressurization process.

2. A high-temperature steam generator safety control system according to claim 1, characterized in that: The pressure monitoring unit collects statistics of the container pressures collected multiple times, and arranges the collected container pressures in order of numerical values ​​to obtain a container pressure sequence; The pressure monitoring unit extracts data accounting for X% at both ends of the container pressure sequence and records them as a pending sequence, records the container pressure sequence after removing the pending sequence as a preprocessed pressure sequence and performs arithmetic averaging to obtain a preprocessed mean, and the pressure monitoring unit compares each container pressure in the pending sequence with the preprocessed mean to obtain a pending ratio, and the pressure monitoring unit performs a threshold judgment on the pending ratio, and deletes or retains the corresponding container pressure according to the judgment result.

3. A high-temperature steam generator safety control system according to claim 2, characterized in that: The pressure monitoring unit summarizes the container pressures in the preprocessing pressure sequence and the container pressures retained in the pending sequence into a valid data set, performs arithmetic averaging on the valid data set to obtain the operating pressure, and sends the operating pressure to the pressure comprehensive analysis unit.

4. A high-temperature steam generator safety control system according to claim 3, characterized in that: After acquiring the operating pressure, the comprehensive pressure analysis unit compares the operating pressure with a set pressure threshold, and generates an overpressure signal or a normal pressure signal according to the comparison result.

5. A high-temperature steam generator safety control system according to claim 4, characterized in that: After acquiring the normal pressure signal, the pressure comprehensive analysis unit analyzes the fluctuation value of the operating pressure to obtain the upper and lower limits of the fluctuation operation. The pressure comprehensive analysis unit performs a threshold analysis according to the upper limit of the fluctuation operation, and generates a fluctuation over-limit signal or a fluctuation normal signal according to the analysis result; The pressure comprehensive analysis unit performs a formula analysis on the pressure fluctuation amplitude and the operating pressure to generate a pressure danger value. If the pressure danger value exceeds a set threshold, a pressure high-risk signal is generated. If the pressure danger value does not exceed the set threshold, a pressure low-risk signal is generated.

6. A high-temperature steam generator safety control system according to claim 5, characterized in that: The process of the pressure comprehensive analysis unit analyzing the fluctuation value of the operating pressure is as follows: The pressure comprehensive analysis unit calculates the standard deviation of the container pressure in the valid data set, uses the obtained standard deviation as the pressure fluctuation amplitude of the operating pressure, and records the maximum value and minimum value in the valid data as the fluctuation operation upper limit and the fluctuation operation lower limit respectively.

7. A high-temperature steam generator safety control system according to claim 1, characterized in that: The pressure assessment unit generates a fluctuation warning after acquiring a high-risk pressure signal, generates an overpressure warning after generating an overpressure signal and a fluctuation exceeding limit signal, and sends the fluctuation warning and overpressure warning to the safety control unit; After obtaining the overpressure warning, the safety control unit reduces the operating power of the steam generator and starts the pressure relief valve of the steam generator; The safety control unit stops the operation of the steam generator after obtaining the fluctuation warning.

8. A high-temperature steam generator safety control system according to claim 1, characterized in that: When the safety control unit releases pressure on the steam generator, the safety control unit sends a pressure relief instruction to the liquid parameter monitoring unit. After receiving the pressure relief instruction, the liquid parameter monitoring unit immediately collects the liquid temperature and container pressure in the steam generator and records them as the initial temperature and initial pressure. The liquid parameter monitoring unit always monitors the container pressure during the pressure relief process, calculates the difference between the continuously obtained container pressure and the initial pressure to obtain the pressure relief pressure, records the duration of the pressure relief as the pressure relief time, and obtains the pressure relief speed by performing a proportional calculation between the pressure relief pressure and the pressure relief time. The liquid parameter monitoring unit analyzes the pressure relief speed and the initial temperature according to a formula to obtain a pressure relief value. The liquid parameter monitoring unit compares the pressure relief value with a set threshold value. If the pressure relief value is greater than the set threshold value, a pressure relief too fast signal is generated and the pressure relief speed is reduced. If the pressure relief value is less than or equal to the set threshold value, no response is made.

9. A high-temperature steam generator safety control method, applicable to a high-temperature steam generator safety control system according to claim 1, characterized in that: The steps include: Step 1: Container pressure data collection and valid data determination; Step 2: Extraction of operating pressure and its fluctuation data; Step 3: Analysis of pressure conditions and fluctuation thresholds; Step 4: Generate early warning signals; Step 5: Automatic safety control; Step 6: Pressure relief speed control.

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