CN111853753A - Steam generation system based on SOEC and control method thereof - Google Patents
Steam generation system based on SOEC and control method thereof Download PDFInfo
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- CN111853753A CN111853753A CN202010856184.7A CN202010856184A CN111853753A CN 111853753 A CN111853753 A CN 111853753A CN 202010856184 A CN202010856184 A CN 202010856184A CN 111853753 A CN111853753 A CN 111853753A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/44—Applications, arrangements, or dispositions of alarm or automatic safety devices of safety valves
- F22B37/446—Safety devices responsive to overpressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/47—Applications, arrangements, or dispositions of alarm or automatic safety devices responsive to abnormal temperature, e.g. actuated by fusible plugs
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Abstract
The invention discloses a steam generation system based on SOEC and a control method thereof, comprising a water storage tank, a magnetic pump, a pressure-resistant water tank, a liquid mass flowmeter and a steam generator; the water storage tank, the magnetic pump, the pressure-resistant water tank, the liquid mass flowmeter and the steam generator are sequentially connected through pipelines; a steam outlet of the steam generator is connected with a steam conveying pipeline, and the generated steam is conveyed to a subsequent steam utilization unit; an electromagnetic regulating valve a for regulating the flow is arranged between the magnetic pump and the pressure-resistant water tank; a coupling electromagnetic valve for adjusting the flow is arranged between the liquid mass flowmeter and the steam generator; the steam conveying pipeline is respectively connected with the steam utilization unit and the emptying pipeline, and the joint is respectively provided with a stop valve a and a stop valve b which are used for opening and closing the pipeline.
Description
Technical Field
The invention relates to the field of solid oxide electrolysis technology (SOEC), in particular to a steam generation system based on SOEC and a control method thereof.
Background
Hydrogen is more and more concerned because of the advantages of cleanness, high heat value, large raw material storage capacity, rich application scenes and the like, and becomes a carrier for developing new energy in China.
At present, the water electrolysis hydrogen production energy storage technology mainly comprises an alkaline electrolysis technology, a solid polymer electrolysis technology (SPE) and a solid oxide electrolysis technology (SOEC). Alkaline electrolysis technology is the most mature and the lowest in cost, and large-scale hydrogen production application is realized, but the efficiency is low. The SPE water electrolysis hydrogen production is suitable for application in fluctuating power supply occasions and has higher cost. The solid oxide water electrolysis technology (SOEC) adopts solid oxide as an electrolyte material to perform electro-hydrogen conversion at high temperature, has the advantages of high energy conversion efficiency, no need of noble metal catalysts, low electrolysis voltage and the like, and is a water electrolysis technology with the most prospect at present.
At present, the companies which carry out research in the SOEC field abroad include Sunfire company in germany, Idaho national laboratory, Bloom Energy, danish tobuo fuel cell company, korea Energy research institute and development project of the Relhy high-temperature electrolysis technology in the european union, and the research direction gradually shifts from the cell material research to the cell stack and system integration. From the research results in recent years, the SOEC electric pile power of the project of Idaho national laboratory in the United states reaches 15kW, the early product is introduced in 2017 by Sunfire company in Germany, and the demonstration of the hydrogen station is started. SOEC-related research work is carried out on the basis of solid oxide fuel cell research by the national Chinese academy of sciences, the institute of chemical and physical, Qinghua university, China mining university, national grid company and China science and technology university. Since the SOEC has very strict requirements on materials, the research direction of the SOEC also has certain pertinence, for example, the regulation and control research on the attenuation mechanism and microstructure of the Ni in the Ni/YSZ hydrogen electrode, which is easy to oxidize and deactivate, is carried out under the high-temperature and high-humidity conditions of the electrolyzed water; the oxygen electrode of the conventional material has serious anode polarization and easy delamination under the electrolysis mode, the voltage loss of the oxygen electrode is far higher than that of the hydrogen electrode and the electrolyte, and the research of developing a novel material and a novel oxygen electrode to reduce the polarization loss. In the field of stack integration, research on novel glass or glass-ceramic sealing materials to improve the service life of the materials. However, the research on the aspect of the electrolytic cell system is less, and the innovation of each module unit in the SOEC system is less.
Generally, the SOEC system mainly includes an electrolytic cell stack unit, a gas supply unit, a water vapor preparation unit, a gas preheating unit, an electrolytic cell charging and discharging unit, a tail gas treatment unit, and the like. In the SOEC hydrogen production system, under the working mode of hydrogen production, the inlet gas is generally a mixed gas of hydrogen and steam, the obtained products are pure hydrogen and pure oxygen, the inlet gas needs to contain steam with high enough content to ensure the smooth operation of electrolysis, and whether the continuous, accurate and stable supply of the high-temperature steam can be realized is one of the key factors influencing the smooth operation of the SOEC system and is also a difficult problem which is urgently needed to be overcome at present; meanwhile, because the high-temperature steam generated by the steam unit is generally about 700 ℃, the high-temperature steam belongs to a high-temperature hazard source, and how to improve the safety performance of the system unit on the premise of continuously and stably outputting the high-temperature steam is also a key point of research. At present, patents related to SOEC systems such as CN101067209A "high-temperature steam electrolysis hydrogen production electrode testing device", CN101216495A "high-temperature steam electrolysis hydrogen production online testing system and testing method thereof", CN105449250A "a kilowatt-level reversible solid oxide fuel cell-electrolytic cell testing system", CN208955118U "a solid oxide fuel cell tail gas treatment system based on a solid oxide electrolytic cell" and the like have been published, but there are no reports related to a steam unit control method in the SOEC system.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of the prior art and provides a steam generation system based on an SOEC and a control method thereof so as to realize continuous, accurate and stable supply of water vapor and ensure the smooth operation of the steam generation system in the SOEC.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a steam generation system based on SOEC comprises a water storage tank, a magnetic pump, a pressure-resistant water tank, a liquid mass flowmeter and a steam generator;
the water storage tank, the magnetic pump, the pressure-resistant water tank, the liquid mass flowmeter and the steam generator are sequentially connected through pipelines;
a steam outlet of the steam generator is connected with a steam conveying pipeline, and the generated steam is conveyed to a subsequent steam utilization unit;
an electromagnetic regulating valve a for regulating the flow is arranged between the magnetic pump and the pressure-resistant water tank;
a coupling electromagnetic valve for adjusting the flow is arranged between the liquid mass flowmeter and the steam generator;
the steam conveying pipeline is respectively connected with the steam utilization unit and the emptying pipeline, and the joint is respectively provided with a stop valve a and a stop valve b which are used for opening and closing the pipeline.
Furthermore, the top parts of the pressure-resistant water tank and the steam generator are respectively connected back to the water storage tank through exhaust pipelines, and the exhaust pipelines are respectively and correspondingly provided with an automatic exhaust valve and a safety valve.
Furthermore, a circulation pipeline is connected back to the water storage tank between the magnetic pump and the electromagnetic regulating valve a, and an electromagnetic regulating valve b for regulating the flow is arranged on the circulation pipeline.
Furthermore, a water outlet is arranged at the bottom of the water storage tank and is connected with an emptying pipeline through a hand valve a, and water in the water storage tank is emptied through the emptying pipeline; and a hand valve b is arranged at the water outlet of the emptying pipeline.
Further, a check valve is arranged between the coupling electromagnetic valve and the steam generator.
Furthermore, a liquid level meter L1 used for monitoring the water level in the water storage tank is arranged on the water storage tank; a pressure gauge P1 for monitoring the pressure in the pressure-resistant water tank is arranged on the pressure-resistant water tank; the steam generator is provided with a temperature meter T1 for monitoring the temperature in the steam generator.
Furthermore, a pressure gauge P2 and a temperature gauge T2 are arranged on the steam delivery pipeline.
Still further, the liquid level meter further comprises a PLC control system, and pins of the PLC control system are respectively in signal connection with a liquid level meter L1, a magnetic pump, an electromagnetic regulating valve b, an electromagnetic regulating valve a, a pressure gauge P1, a liquid mass flow meter, a coupling electromagnetic valve, a thermometer T1, a pressure gauge P2, a thermometer T2, a cutoff valve a, a cutoff valve b and a buzzer.
The invention also provides a control method of the steam generation system based on the SOEC, which comprises the following steps:
s1: the liquid level meter L1 monitors a water level signal of the water storage tank and sends the water level signal to the PLC control system, the PLC control system judges whether the water level signal is normal or not, if the water level signal is abnormal, the PLC control system sends a signal to the buzzer, if the water level signal is normal, the PLC control system gives an alarm, and if the water level signal is normal, the step S2 is executed;
s2: the PLC control system sends starting signals to the electromagnetic regulating valve a and the electromagnetic regulating valve b, the electromagnetic regulating valve a and the electromagnetic regulating valve b execute actions, signals are fed back to the PLC control system when the starting is abnormal, an abnormal window pops up on a display screen of the PLC control system, signals are sent to a buzzer at the same time, the buzzer gives an alarm, and the step S3 is carried out when the starting is normal;
s3: the PLC control system sends a starting signal to the magnetic pump, the magnetic pump executes action, if the starting is abnormal, a signal is fed back to the PLC control system, an abnormal window pops up on a display screen of the PLC control system, meanwhile, a signal is sent to a buzzer, the buzzer gives an alarm, if the starting is normal, an automatic exhaust valve automatically controls exhaust, and the step S4 is carried out;
s4: the pressure gauge P1 monitors a pressure signal in the pressure-resistant water tank and sends the signal to the PLC control system, the PLC control system judges whether the pressure signal is normal or not, if the pressure signal is abnormal, the PLC control system sends an adjusting signal to the electromagnetic adjusting valve a and the electromagnetic adjusting valve b to adjust the corresponding opening; after the pressure signal is normal, the step S5 is carried out;
s5: the PLC control system sends starting signals to the liquid mass flowmeter, the coupling electromagnetic valve and the cut-off valve b, the liquid mass flowmeter, the coupling electromagnetic valve and the cut-off valve b execute actions, if the starting is abnormal, the signals are fed back to the PLC control system, an abnormal window pops up on a display screen of the PLC control system, meanwhile, signals are sent to the buzzer, the buzzer gives an alarm, and if the starting is normal, the step S6 is carried out;
s6: the PLC control system sends a starting signal to the steam generator, the steam generator executes action, if the starting is abnormal, a signal is fed back to the PLC control system, an abnormal window pops up on a display screen of the PLC control system, meanwhile, a signal is sent to a buzzer, the buzzer gives an alarm, and if the starting is normal, the step S7 is carried out;
s7: the temperature meter T1 monitors a temperature signal in the steam generator and sends the temperature signal to the PLC control system, the PLC control system judges whether the temperature signal is normal or not, if the temperature signal is normal, an abnormal window is popped up on a display screen of the PLC control system, meanwhile, a signal is sent to the buzzer, the buzzer gives an alarm, and if the temperature signal is normal, the step S8 is carried out;
s8: a pressure gauge P2 and a thermometer T2 monitor pressure signals and temperature signals of steam in the steam conveying pipeline and send the pressure signals and the temperature signals to the PLC control system, and the PLC control system judges whether the temperature signals and the pressure signals meet set conditions or not; if yes, go to step S9; if at least one of the temperature signal and the pressure signal is not satisfied, the PLC control system sends a temperature rise signal to the steam generator until the temperature signal and the pressure signal both satisfy the set conditions;
s9: the PLC control system sends a signal whether to carry out steam delivery to the terminal control system and waits for signal feedback of the terminal control system; after receiving the signal feedback of the terminal control system, the PLC control system sends signals to the cut-off valve a and the cut-off valve b, the cut-off valve a is opened, the cut-off valve b is closed, and steam is conveyed to the steam using unit; if the stop valve a and the stop valve b are abnormally started, a signal is fed back to the PLC control system, an abnormal window pops up on a display screen of the PLC control system, a signal is sent to the buzzer, and the buzzer gives an alarm.
Has the advantages that:
(1) the steam generating system adopts the pressure-resistant water tank, avoids the influence of flow fluctuation generated at the input end on the output end, and provides continuous and stable conveying pressure for the liquid mass flowmeter. Meanwhile, the liquid mass flow meter and the coupling solenoid valve are controlled in an interlocking mode to achieve accurate control of liquid flow, and accurate flow is provided for the steam generator.
(2) The steam generating system of the invention is provided with a pressure-resistant water tank, a liquid mass flowmeter, an air evaporator, a plurality of functional valves and instruments, and is assisted with a PLC control program to control the instructions according to the process sequence in the technical scheme, thereby realizing continuous and stable operation in the process from the water source supply to the air evaporator to the next unit and realizing the control of high-precision flow.
(3) The steam generation system control method adopts four logic control modes of a startup mode, a normal operation mode, a failure mode and a shutdown mode, not only carries out instruction control on the startup mode, the normal operation mode and the shutdown mode in an all-round way, but also carries out all-round control analysis on various devices, valves and key instruments in the failure mode (abnormal mode), realizes multi-angle monitoring and troubleshooting on abnormal problems occurring in the operation period of a steam unit, and finally ensures the stable operation of the process.
(4) High-temperature steam generated by the steam generation system is generally about 700 ℃, belongs to a high-temperature environment, has a large danger coefficient, and in the operation process, the PLC control system carries out detailed failure logic analysis and is assisted with hardware monitoring such as a safety valve, an electromagnetic cut-off valve and an instrument, so that the safe operation of a steam unit is realized.
Drawings
The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic diagram of the overall structure of the SOEC-based steam generation system.
Wherein each reference numeral represents: 1, a water storage tank; 2, a magnetic pump; 3, electromagnetic regulating valve a; 4, a pressure-resistant water tank; 5a liquid mass flow meter; 6, coupling an electromagnetic valve; 7 a check valve; 8, a steam generator; 9 electromagnetic cut-off valve b; 10 electromagnetic cut-off valve a; 11 electromagnetic regulating valve b; 12 automatic exhaust valve; 13 a safety valve; 14 steam using unit; 15 a buzzer; 16 water injection ports; 17 pressure gauge P1; 18 pressure gauge P2; 19 temperature table T2; 20 temperature table T1; 21 hand valve a; 22 hand valve b; 23 level gauge L1.
Detailed Description
The invention will be better understood from the following examples.
As shown in FIG. 1, the steam generation system based on the SOEC mainly comprises a PLC control system, and various instruments, valves, flow meters and auxiliary equipment in a schematic diagram. Comprises a water storage tank 1, a magnetic pump 2, a pressure-resistant water tank 4, a liquid mass flowmeter 5 and a steam generator 8; the water storage tank 1, the magnetic pump 2, the pressure-resistant water tank 4, the liquid mass flowmeter 5 and the steam generator 8 are connected in sequence through pipelines; the steam outlet of the steam generator 8 is connected with a steam delivery pipeline, and the generated steam is sent to a subsequent steam utilization unit 14; an electromagnetic regulating valve a3 for regulating flow is arranged between the magnetic pump 2 and the pressure-resistant water tank 4; a coupling electromagnetic valve 6 for adjusting the flow is arranged between the liquid mass flow meter 5 and the steam generator 8; the steam delivery pipeline is respectively connected with the steam using unit 14 and the emptying pipeline, and the joints are respectively provided with an electromagnetic cut-off valve a10 and an electromagnetic cut-off valve b9 for opening and closing the pipelines.
Wherein, the top parts of the pressure-resistant water tank 4 and the steam generator 8 are respectively connected back to the water storage tank 1 through exhaust pipelines, and the exhaust pipelines are respectively and correspondingly provided with an automatic exhaust valve 12 and a safety valve 13. The magnetic pump 2 and the electromagnetic valve a3 are connected back to the water storage tank 1 through a circulating pipeline, and the circulating pipeline is provided with an electromagnetic valve b11 for adjusting the flow. The bottom of the water storage tank 1 is provided with a water outlet which is connected with an emptying pipeline through a hand valve a21, and water in the water storage tank 1 is emptied through the emptying pipeline; and a hand valve b22 is arranged at the water outlet of the emptying pipeline. Between the coupling solenoid valve 6 and the steam generator 8, a check valve 7 is provided. The water storage tank 1 is provided with a liquid level meter L123 for monitoring the water level in the water storage tank; a pressure gauge P117 for monitoring the pressure in the pressure-resistant water tank is arranged on the pressure-resistant water tank 4; the steam generator 8 is provided with a temperature meter T120 for monitoring the temperature in the steam generator 8. The steam delivery pipeline is provided with a pressure gauge P218 and a temperature gauge T219. The pins of the PLC control system (6ES7288) are respectively in signal connection with a liquid level meter L1(RLT-1000)23, a magnetic pump (HPP/HPF 100)2, an electromagnetic regulating valve b (ZQ-16P-DN10 x 3)11, an electromagnetic regulating valve a (ZQ-16P-DN10)3, a pressure gauge P1(BST6600-20BB)17, a liquid mass flow meter (M13-AAD-22-K-S)5, a coupling electromagnetic valve 6, a temperature gauge T1(T32/TIF50S)20, a pressure gauge P2(EJA530E-JBS9N-012EN/NF2)18, a temperature gauge T2(T32/TIF50S)19, an electromagnetic cut-off valve a (ZSB311-16P-G-DN10)10, an electromagnetic cut-off valve a (ZSB 311-16P-G-10) 9 and a buzzer (V09012) of a passive cut-V09015.
The operation flow of the steam generation system is as follows: water in the water storage tank is conveyed to a pressure-resistant water tank through a magnetic pump, the pressure-resistant water tank is conveyed to a steam generator after being controlled by a liquid mass flow meter and a coupling electromagnetic valve in an interlocking mode, and finally steam generated by the steam generator is conveyed to a next steam utilization unit (SOEC electric pile system). A pressure gauge P2, a thermometer T2 and an electromagnetic cut-off valve are arranged on a steam delivery pipeline from the outlet of the steam generator to the next steam unit; the outlet pipeline of the pressure-resistant water tank is provided with an automatic exhaust valve to form a loop with the water storage tank, a safety valve is arranged between the steam generator and the water storage tank, and the PLC system performs command control on each valve, instrument and equipment.
The water storage tank is used as a water supply source, the magnetic pump provides conveying power, the electromagnetic regulating valve a controls the water supply amount, and the pressure-resistant water tank is matched with the automatic exhaust valve for use. The liquid mass flowmeter is interlocked with the coupling electromagnetic valve, and can provide accurate liquid flow for the steam generator under the control of the PLC system, so that the steam quantity generated in unit time is in a controllable range. The safety valve is arranged on the pipeline of the steam generator returning to the water storage tank, so that the steam is timely released when the steam generator is abnormal, and the pressure of a steam outlet is always in a control range. A pressure gauge P2, a temperature gauge T2 and an electromagnetic shut-off valve are arranged on a pipeline from an outlet of the steam generator to a steam using unit (SOEC electric pile system) for the purpose of final monitoring and response of delivered steam. The PLC control system is internally provided with a buzzer, and when the system is in an abnormal mode, the buzzer can give out warning sound for reminding. The valves, instruments and equipment are all monitored, responded and operated by PLC control program instructions according to the control method of the invention. The specific control method adopted in the control system comprises the following steps:
1. front setting:
firstly, a system power transmission and water storage tank injects water through a water injection port 16, the system is started, a pure water delivery magnetic pump automatically detects a control point position by a PLC control system after process parameters are set, and a steam outlet pipeline is opened by electric tracing.
2. A starting mode:
step 1: the L1 level gauge checks the liquid level of the water storage tank and feeds back to the PLC control system, the PLC judges whether the liquid level is normal, if so, the PLC sends out a signal, if so, the buzzer gives an alarm, and if so, the step 2 is entered.
Step 2: the PLC sends out starting signals of the electric control valve a and the electric control valve b, the electric control valve a and the electric control valve b execute actions, if the starting is abnormal, the PLC sends out signals, the buzzer alarms, and the display screen pops out an abnormal window; and if the result is normal, the step 3 is entered.
And step 3: the PLC sends out a magnetic pump starting signal, the magnetic pump executes action, if the feedback signal is abnormal, the PLC sends out a signal, the buzzer alarms, the display screen pops out an abnormal window, if the feedback signal is normal, the automatic exhaust valve automatically controls exhaust, and the PLC control system enters step 4.
And 4, step 4: the PLC outputs a pressure check signal, the pressure of the pressure resistant water tank P2 is executed, the signal is fed back, the PLC controls and judges the pressure, and the PLC sends a signal when the pressure is abnormal, so that the opening degree of the electric control valve a and the opening degree of the electric control valve b are adjusted. The pressure normally goes to step 5.
And 5: the PLC outputs signals for starting the liquid mass flow meter, starting the coupling electromagnetic valve and opening the electromagnetic cut-off valve b, the liquid mass flow meter, the coupling electromagnetic valve and the electromagnetic cut-off valve b execute actions, if the feedback signals are abnormal, the PLC sends out signals, the buzzer gives an alarm, the display screen pops up an abnormal window, and the step 6 is normally executed.
Step 6: the PLC sends out a steam generator starting signal, the steam generator executes action, if the feedback signal is abnormal, the PLC sends out a signal, the buzzer gives an alarm, the display screen pops up an abnormal window, and the step 7 is normally entered.
And 7: PLC sends T1 temperature detection and acquisition signal, and steam generator temperature T1 detects, and feedback signal is unusual then PLC signals, and the buzzer reports to the police, and the display screen pops out unusual window, then normally gets into step 8.
And 8: the PLC sends out signals of detecting the pressure P2 of the steam outlet and detecting the temperature T2, and the PLC receives the signals to judge when the P2 and the T2 execute actions and feed back the signals. If the judgment result is that P2 and T2 meet the conditions, the step 9 is executed; if the P2 meets the condition that T2 does not meet the condition or T2 meets the condition that P2 does not meet the condition, the system delays response, T2 and P2 are monitored continuously, if the P2 and T2 meet the condition, the monitoring result enters step 9, if the P2 and T2 do not meet the condition, the PLC sends a signal for increasing the temperature of the steam generator, and the steam generator performs a warming action.
And step 9: the PLC sends out a condition of normal steam conveying, requests the terminal control system whether to convey steam, and maintains the current situation and waits for an instruction if the steam conveying is not executed; if the steam is conveyed, the PLC sends an electromagnetic cut-off valve a to be started, an electromagnetic cut-off valve b closes a signal, the electromagnetic cut-off valve executes actions, if the feedback signal is abnormal, the PLC sends a signal, the buzzer gives an alarm, the display screen pops up an abnormal window, and if the feedback signal is normal, the PLC control system reminds the steam generation unit to normally operate.
3. And (3) a normal operation mode:
there are 8 steps to monitor in the normal operating mode, step 1: monitoring the liquid level of the water storage tank; step 2: monitoring the pressure of the pressure-resistant water tank; and step 3: monitoring the temperature of the steam generator; and 4, step 4: monitoring a steam generator outlet pressure; and 5: monitoring the outlet temperature of the steam generator; step 6: monitoring changes of a pressure gauge P2 and a thermometer T2, and automatically fine-tuning a steam generator temperature control system by a PLC control system; and 7: monitoring the change of a pressure gauge P1, and automatically fine-adjusting the opening degrees of the electromagnetic regulating valve a and the electromagnetic regulating valve b by the PLC control system; and 8: according to the change of the monitoring L1, the PLC control system sends out alarm buzzing sound to remind water injection.
4. Failure mode:
l1 level gauge anomaly:
(1) when the liquid level meter suddenly has no liquid level display, the PLC controls the automatic buzzer, the control screen pops up a dialog box to confirm whether the system continues to operate or not, and if the system continues to operate, abnormal points are manually checked and processed; and if the operation is stopped, the PLC control system executes an emergency stop mode 1.
(2) When the liquid of the liquid level meter fluctuates greatly, the PLC controls the automatic buzzing sound, the PLC monitors the pressure of the pressure resistant water tank P1 to confirm, if the pressure control range is not exceeded, the liquid level meter L1 is checked manually to be abnormal, and the special nursing operation is carried out; if the pressure control range is exceeded, the control screen pops up a dialog box, whether the operation is continued or not is judged manually, and if the operation is continued, the abnormal operation is processed, and the operation is specially protected. And if the PLC control system stops operating, executing an emergency stop mode 1.
Abnormality of the electric regulator valve 4:
(1) the regulating valve does not execute action or receives no signal, the PLC controls the automatic buzzer, the PLC monitors the pressure P1 of the pressure-resistant water tank, and if the pressure does not exceed the pressure control range, the special nursing operation is carried out; and if the pressure control range is exceeded, popping up a dialog box by the control screen, manually judging whether the operation is continued, if the operation is continued, processing abnormity, performing special nursing operation, and if the operation is stopped, executing an emergency shutdown mode 1 by the PLC control system.
(2) And when the regulating valve is suddenly closed, the PLC control system automatically sends out a buzzing sound, and after the PLC delays for a certain time, the emergency stop mode 1 is executed.
Abnormality of electric control valve 1:
(1) when the regulating valve does not execute action or receives no signal, the PLC controls the automatic buzzer, monitors the pressure P1 of the pressure-resistant water tank, and when the pressure control range is not exceeded, the PLC specially protects the operation; and if the pressure control range is exceeded, popping up a dialog box by the control screen, manually judging whether the operation is continued, if the operation is continued, processing abnormity, performing special nursing operation, and if the operation is stopped, executing an emergency shutdown mode 1 by the PLC control system.
(2) And when the regulating valve is suddenly closed, the PLC control system automatically sends out a buzzing sound, and after the PLC delays for a certain time, the emergency stop mode 2 is executed.
Abnormality of the pressure-resistant water tank P1:
(1) when the pressure gauge suddenly has no pressure display, the PLC control system automatically sends out a buzzer, the flow change of the liquid mass flowmeter 1 is detected, and if the flow change does not exceed the flow control range, abnormal points are processed, and the operation is specially protected; and if the flow control range is exceeded, popping up a dialog box by the control screen, manually judging whether the operation is continued, if the operation is continued, processing abnormity, performing special nursing operation, and if the operation is stopped, executing an emergency shutdown mode 2 by the PLC control system.
(2) The pressure gauge fluctuates greatly, the PLC control system sends out a buzzer automatically, the flow change of the liquid mass flowmeter 1 is detected, if the flow change does not exceed the pressure control range, abnormal points are processed, and the operation is specially protected; and if the flow control range is exceeded, popping up a dialog box by the control screen, manually judging whether the operation is continued, if the operation is continued, processing abnormity, performing special nursing operation, and if the operation is stopped, executing an emergency shutdown mode 2 by the PLC control system.
Abnormality of the magnetic pump: and the magnetic pump stops running suddenly, and the PLC control system executes an emergency stop mode 1 at the moment.
Liquid mass flow agent control exception:
(1) when no flow is displayed suddenly, the PLC control system automatically sends out a buzzer, the PLC monitors the pressure change of P1, if the pressure change does not exceed the pressure control range, abnormal points are processed, and the operation is specially protected; and if the pressure exceeds the pressure control range (is lower than the pressure control range), popping up a dialog box by the control screen, manually judging whether to continue to operate, if so, processing abnormity, performing special nursing operation, and if not, executing an emergency shutdown mode 1 by the PLC control system.
(2) The flow fluctuation exceeds the control range, the PLC control system automatically sends out a buzzer, the PLC monitors the pressure P1 change, if the flow fluctuation exceeds the pressure control range, a control screen pops up a dialog box, whether the operation is continued or not is manually judged, and if the operation is continued, abnormal processing is carried out, and the operation is specially protected. If the operation is stopped, the PLC control system executes an emergency shutdown mode 1; if the pressure control range is not exceeded, monitoring the change of the steam generator outlet pressure P2 or the steam generator outlet temperature T2, if the steam generator outlet pressure P2 or the steam generator outlet temperature T2 exceeds the control range, popping up a dialog box on a control screen, manually judging whether to continue to operate, if the operation continues, processing abnormity, specially protecting the operation, and if the operation is stopped, executing an emergency shutdown mode 1 by the PLC control system.
Abnormality of the steam generator:
(1) and if the temperature T1 is suddenly not displayed, the PLC control system automatically sends out a buzzer, the PLC monitors the change of the outlet pressure P2 and the outlet temperature T2 of the steam generator, and if the outlet pressure is not beyond the control range, abnormal points are treated, and the operation is specially protected. And if the control range is exceeded, popping up a dialog box by the control screen, manually judging whether the operation is continued, if the operation is continued, processing abnormity, performing special nursing operation, and if the operation is stopped, executing an emergency shutdown mode 3 by the PLC control system.
(2) When the temperature T1 suddenly exceeds the control range, the PLC control system automatically sends out a buzzer, the PLC monitors the change of the outlet pressure P2 and the outlet temperature T2 of the steam generator, if the temperature does not exceed the control range, abnormal points are processed, and the operation is specially protected; and if the control range is exceeded, popping up a dialog box by the control screen, manually judging whether the operation is continued, if the operation is continued, processing abnormity, performing special nursing operation, and if the operation is stopped, executing an emergency shutdown mode 3 by the PLC control system.
Steam outlet temperature T2 anomaly: if the temperature T2 is suddenly not displayed or the temperature T2 suddenly exceeds the control range, the PLC control system automatically sends out a buzzer, the PLC monitors three data of the temperature T1 of the steam generator, the flow of the liquid mass flow control 1 and the outlet pressure P2 of the steam generator, and if the PLC judges that the three data are in the control range, abnormal points are processed, and the operation is specially protected; and if at least one of the three items is not in the control range, the PLC control system executes an emergency shutdown mode 3.
Steam outlet pressure P2 anomaly: when the temperature of P2 is suddenly not displayed or the temperature of P2 suddenly exceeds the control range, the PLC control system automatically sends out a buzzer, the PLC monitors three data of the temperature T1 of the steam generator, the flow of the liquid mass flow control 1 and the outlet temperature T2 of the steam generator, and if the PLC judges that the three data are in the control range, abnormal points are processed, and special care is carried out; and if at least one of the three items is not in the control range, the PLC control system executes an emergency shutdown mode 3.
Abnormal steam outlet electromagnetic cut-off valve a: if the electromagnetic cut-off valve does not execute the action, does not receive the signal or is closed suddenly, the PLC controls to automatically send out the buzzing sound, and the PLC executes the emergency stop mode 4 after delaying for a certain time; if the electromagnetic cut-off valve a is suddenly opened, the PLC control system automatically sends out buzzing sound, and the PLC executes the emergency stop mode 5 after delaying for a certain time.
And (3) the steam outlet electromagnetic cut-off valve b is abnormal: if the stop valve does not execute the action, does not receive the signal or is suddenly closed, the PLC automatically sends out a buzzing sound, and the PLC executes an emergency stop mode 5 after delaying for a certain time; if the electromagnetic cut-off valve b is suddenly opened, the PLC control system automatically sends out buzzing sound, and the PLC executes the emergency stop mode 4 after delaying for a certain time.
5. Shutdown mode:
the shutdown modes include 5 emergency shutdown modes and 1 normal shutdown mode, and the 6 shutdown modes include settings for the PLC to stop supplying steam and request the terminal control system to execute or not, so the following examples of each mode are not repeated.
Emergency shutdown mode 1: the PLC automatically sends out an instruction, the magnetic pump stops running, the electric control valve b is fully opened, the electric control valve a is fully opened, the steam generator stops running, the electromagnetic cut-off valve b is opened, and the electromagnetic cut-off valve a is closed.
Emergency stop mode 2: the PLC automatically sends out an instruction, the electric control valve b is fully opened, the steam generator is stopped, the electromagnetic cut-off valve b is opened, and the electromagnetic cut-off valve a is closed.
Emergency stop mode 3: the PLC automatically sends out an instruction, the electric control valve b is fully opened, the steam generator is stopped, the electromagnetic cut-off valve b is opened, the electromagnetic cut-off valve a is closed, and the electromagnetic control valve a is closed.
Emergency shutdown mode 4: the PLC automatically sends out an instruction, the electric control valve b is fully opened, the steam generator is stopped, the electromagnetic cut-off valve b is opened, and the electromagnetic control valve a is closed.
Emergency stop mode 5: the PLC automatically sends out an instruction, when the electric control valve b is fully opened, the steam generator is stopped, the electromagnetic control valve a is closed, and the internal pressure of the steam generator reaches the tripping pressure of the safety valve, tripping and pressure relief are carried out.
Normal shutdown mode: the PLC automatically sends out an instruction, the steam generator is stopped, the electromagnetic cut-off valve a is closed, the electromagnetic cut-off valve b is opened, and at the moment, when the temperature T1 of the steam generator is reduced to a set value, the magnetic pump is stopped, the electric control valve a is closed, and the electric control valve b is closed.
The invention provides a steam generating system based on SOEC and a method for controlling the same, and a plurality of methods and ways for implementing the technical scheme, and the above description is only a preferred embodiment of the invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the invention, and these improvements and decorations should also be regarded as the protection scope of the invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (9)
1. A steam generation system based on SOEC is characterized by comprising a water storage tank (1), a magnetic pump (2), a pressure-resistant water tank (4), a liquid mass flow meter (5) and a steam generator (8);
the water storage tank (1), the magnetic pump (2), the pressure-resistant water tank (4), the liquid mass flowmeter (5) and the steam generator (8) are sequentially connected through pipelines;
the steam outlet of the steam generator (8) is connected with a steam delivery pipeline, and the generated steam is sent to a subsequent steam utilization unit (14);
an electromagnetic regulating valve a (3) for regulating the flow is arranged between the magnetic pump (2) and the pressure-resistant water tank (4);
a coupling electromagnetic valve (6) for adjusting the flow is arranged between the liquid mass flow meter (5) and the steam generator (8);
the steam conveying pipeline is respectively connected with the steam utilization unit (14) and the emptying pipeline, and the joint is respectively provided with a cut-off valve a (10) and a cut-off valve b (9) which are used for opening and closing the pipeline.
2. The SOEC-based steam generation system according to claim 1, wherein the top of the pressure-resistant water tank (4) and the top of the steam generator (8) are connected back to the water tank (1) through exhaust pipes, and the exhaust pipes are respectively provided with an automatic exhaust valve (12) and a safety valve (13).
3. The SOEC-based steam generating system according to claim 2, wherein the magnetic pump (2) and the electromagnetic valve a (3) are connected back to the water reservoir (1) through a circulation pipe, and the circulation pipe is provided with an electromagnetic valve b (11) for regulating the flow rate.
4. The SOEC-based steam generating system according to claim 1, wherein the bottom of the water reservoir (1) is provided with a drain, which is connected to a drain pipe through a hand valve a (21), through which water in the water reservoir (1) is drained; and a hand valve b (22) is arranged at the water outlet of the emptying pipeline.
5. SOEC-based steam generation system according to claim 1, characterized in that between the coupling solenoid valve (6) and the steam generator (8) there is a check valve (7).
6. The SOEC-based steam generation system according to claim 3, wherein the water reservoir (1) is provided with a level gauge L1(23) for monitoring the water level in the water reservoir; a pressure gauge P1(17) for monitoring the pressure in the pressure-resistant water tank is arranged on the pressure-resistant water tank (4); the steam generator (8) is provided with a temperature meter T1(20) for monitoring the temperature in the steam generator (8).
7. The SOEC-based steam generation system of claim 6, wherein the steam delivery conduit is provided with a pressure gauge P2(18) and a temperature gauge T2 (19).
8. The SOEC-based steam generation system according to claim 7, further comprising a PLC control system whose pins signal-connect a level gauge L1(23), a magnetic pump (2), a solenoid valve b (11), a solenoid valve a (3), a pressure gauge P1(17), a liquid mass flow meter (5), a coupling solenoid valve (6), a temperature gauge T1(20), a pressure gauge P2(18), a temperature gauge T2(19), a cut-off valve a (10) and a cut-off valve b (9), and a buzzer (15), respectively.
9. The SOEC-based steam generation system control method of claim 8, comprising the steps of:
s1: the liquid level meter L1(23) monitors a water level signal of the water storage tank (1) and sends the water level signal to the PLC control system, the PLC control system judges whether the water level signal is normal or not, if the water level signal is abnormal, the PLC control system sends a signal to the buzzer (15), the buzzer (15) gives an alarm, and if the water level signal is normal, the step S2 is carried out;
s2: the PLC control system sends starting signals to the electromagnetic regulating valve a (3) and the electromagnetic regulating valve b (11), the electromagnetic regulating valve a (3) and the electromagnetic regulating valve b (11) execute actions, if the starting is abnormal, signals are fed back to the PLC control system, an abnormal window pops up on a display screen of the PLC control system, meanwhile, signals are sent to the buzzer (15), the buzzer (15) gives an alarm, and if the starting is normal, the step S3 is carried out;
s3: the PLC control system sends a starting signal to the magnetic pump (2), the magnetic pump (2) executes action, if the starting is abnormal, a signal is fed back to the PLC control system, an abnormal window pops up on a display screen of the PLC control system, meanwhile, a signal is sent to the buzzer (15), the buzzer (15) gives an alarm, if the starting is normal, the automatic exhaust valve (12) automatically controls exhaust, and the step S4 is carried out;
s4: a pressure gauge P1(17) monitors a pressure signal in the pressure-resistant water tank (4) and sends the pressure signal to a PLC control system, the PLC control system judges whether the pressure signal is normal or not, if the pressure signal is abnormal, the PLC control system sends an adjusting signal to an electromagnetic adjusting valve a (3) and an electromagnetic adjusting valve b (11) to adjust the corresponding opening degree; after the pressure signal is normal, the step S5 is carried out;
s5: the PLC control system sends starting signals to the liquid mass flow meter (5), the coupling electromagnetic valve (6) and the cut-off valve b (9), the liquid mass flow meter (5), the coupling electromagnetic valve (6) and the cut-off valve b (9) execute actions, if the starting is abnormal, signals are fed back to the PLC control system, an abnormal window pops up on a display screen of the PLC control system, meanwhile, signals are sent to the buzzer (15), the buzzer (15) gives an alarm, and if the starting is normal, the step S6 is carried out;
s6: the PLC control system sends a starting signal to the steam generator (8), the steam generator (8) executes action, if the starting is abnormal, a signal is fed back to the PLC control system, an abnormal window pops up on a display screen of the PLC control system, meanwhile, a signal is sent to the buzzer (15), the buzzer (15) gives an alarm, and if the starting is normal, the step S7 is carried out;
s7: the temperature meter T1(20) monitors a temperature signal in the steam generator (8) and sends the temperature signal to the PLC control system, the PLC control system judges whether the temperature signal is normal, if the temperature signal is normal, a display screen of the PLC control system pops up an abnormal window, meanwhile, a signal is sent to the buzzer (15), the buzzer (15) gives an alarm, and if the temperature signal is normal, the step S8 is carried out;
s8: a pressure gauge P2(18) and a thermometer T2(19) monitor pressure signals and temperature signals of steam in the steam conveying pipeline and send the pressure signals and the temperature signals to the PLC control system, and the PLC control system judges whether the temperature signals and the pressure signals meet set conditions or not; if yes, go to step S9; if at least one of the temperature signal and the pressure signal is not satisfied, the PLC control system sends a heating signal to the steam generator (8) until the temperature signal and the pressure signal both satisfy the set conditions;
s9: the PLC control system sends a signal whether to carry out steam delivery to the terminal control system and waits for signal feedback of the terminal control system; after receiving the signal feedback of the terminal control system, the PLC control system sends signals to a shut-off valve a (10) and a shut-off valve b (9), the shut-off valve a (10) is opened, the shut-off valve b (9) is closed, and steam is conveyed to a steam using unit (14); if the cut-off valve a (10) and the cut-off valve b (9) are started abnormally, a signal is fed back to the PLC control system, an abnormal window pops up on a display screen of the PLC control system, a signal is sent to the buzzer (15) at the same time, and the buzzer (15) gives an alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010856184.7A CN111853753A (en) | 2020-08-24 | 2020-08-24 | Steam generation system based on SOEC and control method thereof |
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| CN202010856184.7A CN111853753A (en) | 2020-08-24 | 2020-08-24 | Steam generation system based on SOEC and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113873463A (en) * | 2021-12-06 | 2021-12-31 | 常州艾肯智造科技有限公司 | Intelligent regulating valve pressure signal transmission system based on 5G communication |
| WO2023165180A1 (en) * | 2022-03-04 | 2023-09-07 | 福建新瓦特科技有限公司 | Steam generation system and steam apparatus |
-
2020
- 2020-08-24 CN CN202010856184.7A patent/CN111853753A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113873463A (en) * | 2021-12-06 | 2021-12-31 | 常州艾肯智造科技有限公司 | Intelligent regulating valve pressure signal transmission system based on 5G communication |
| WO2023165180A1 (en) * | 2022-03-04 | 2023-09-07 | 福建新瓦特科技有限公司 | Steam generation system and steam apparatus |
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