Hydrogen production station water electrolysis device with a bipolar filter press-type electrolytic cell as the main body, the main ancillary equipment placed on the gas-liquid processors, including hydrogen, oxygen separator, lye filters, circulating pumps, fire retardant and so on. In addition, there is also equipped with a rectifier cabinet, control cabinet, water tank, alkali tank, water pump, hydrogen storage tanks.
Cell technology parameters
1 Hydrogen Yield: 10Nm3 / h
2 oxygen production: 5Nm3 / h
3 hydrogen purity: ≥99.8%
4 oxygen purity: ≥99.2%
5 Hydrogen Humidity: <4mg / m3
6 cell Rated working pressure: 3.2MPa
7 cell operating temperature: <90 ℃
8 electrolyzer rated current: 740A
9 cell electrolysis cell operating pressure: ~ 2V
10 electrolyzer hydrogen production unit DC power consumption: 4.6kW.h / Nm3
Turbine generator with full hydrogen cooling system. Hydrogen pressure 0.414MPa, drag the small gas turbine generator can run at 0.21MPa. In the stator winding, hydrogen by arranging a row of rectangular stainless steel tube thin wall between the two Roebel bars, flows from one end side of the coil, which uses an axial cooling. In terms of the rotor winding, hydrogen from both ends of the wire through the hollow to enter, and then discharged into the air gap from the middle of the rotor. At the end of the steam generator, a multi-stage axial fan sucked from the air gap cores, stator coils hydrogen, and hydrogen via pipeline from the outlet box, and hydrogen into two vertical hydrogen cooler, cooling after entering the hydrogen and from both ends of the stator coil, rotor coil, stator core and the stator cable. Hydrogen flowing through the cable into the bushing and then into the outlet box.
First, before driving preparation
1.1 Host washing machine after overhaul hydrogen production should be carried out before the demineralized water washed to remove remaining after the processing means within the various components of mechanical impurities.
1, so that means that all valves are closed.
2, open the tank inlet valve desalination, water into the water tank filled after closing.
3, open the inlet valve circulation pump circulation pump water circulation change into the base valve, open the bypass circulation pump discharge gate, start circulating pump, turn the pump on the tail of the exhaust valve, gradually turn down the bypass discharge door after you close the exhaust air, open lye circulating flow valve, the tank of water into the cell, so that the height of water level rose splitter 1/4 position, stop the circulation pump, close the inlet valve base.
4, open the filter drain valve, the gas-liquid abandon the washing water within the processor, open the drain valve cell, let go of the washing water within the cell, and then close the drain valve
1.2 Seal Check
Equipment installation, maintenance to complete drying apparatus for hydrogen production and gas storage unit. To conduct a comprehensive inspection airtight gas pipeline system.
Nitrogen gas cylinder connected with the filter nitrogen port, close all valves hydrogen generator with an external (off small cycles lye circulation pump inlet valve base, off hydrogen, oxygen, emergency discharge valve, close the valve once the oxygen emission), a hydrogen discharge opening a valve, open the dryer inlet, the hydrogen valve, outlet throttle valve closes the frame II into hydrogen. Into the ventilation system, the system pressure was slowly increased to the rated pressure, with soapy water to check gas line, all the way liquid valve fittings, flanges and weld pipe without leakage, if any leakage phenomenon, the exclusion continues proceed until no leakage so far. Packing 12 hours, the amount of leakage per hour shall not exceed 0.01MPa to seal well.
1.3 electrolyte configuration
30% KOH alkali solution preparation, and gas-liquid cell processor to calculate the volume of 85 liters, 70 liters of pure water injected into the base tank (water level in the water level gauge 1/3 scale), open the base valve alkali lye small cycles, cycles small circulation pump inlet valve base, start the circulating pump, circulating pump discharge valve open, rule out the air pump off, open the alkali lye small circulation pump circulation valve, while circulating adding about 42kg of analytical grade KOH, until complete dissolution , then add V2O5 about 250g, to be dissolved off the alkali lye small circulation pump valve to open the valve to adjust the amount of circulating lye, lye will fight to the cell to the separation level gauge with a display (1/4) to stop the circulation pump , off the circulation pump inlet valve base.
1.4 meters, thermal, electrical inspection
1, notification of chemical instrumentation maintenance hydroxide analyzer calibration.
2, check the maintenance notification thermal thermal signal and pneumatic part of the action is normal.
3, electrical maintenance inspection notification rectifying portions of the circuit if a short circuit fault, each fuse is normal.
1, switching power supply control cabinet always closed, the light should be bright. The pumps were then start to see its rotation is correct, and observe whether the corresponding indication light.
2, check each cell pole to pole, with or without metal or electrolyte leakage phenomenon, found to exclude only allowed to drive.
3, with 10% KOH solution test 48 hours, open, with the normal operation of the parking operation.
5, the test is completed, the hydrogen discharge machine lye, washed with pure water tank. After washable filter disposed of 30% KOH solution into the separator tank to the lowest level.
Second, the driving operation
2.1 Operating control cabinet
1, connected to the control cabinet power supply and instrumentation.
2, connected to the control cabinet and gas liquid gas source processor (should be turned on before the blowpipe, exclusion of impurities into the trachea).
3, the water pump is set to "manual" position.
4, the oxygen level adjustment switch on "auto" position.
5, the tank temperature, tank pressure logger is set to automatically position and adjusted the given value. (Just-machine a given pressure 0.2 ~ 0.3MPa, higher than room temperature about 10 ℃).
2.2 nitrogen purge system
In order to secure power, hydrogen power machine for the first time, the general requirements to nitrogen, to prevent the explosion gas mixture formed in the separator.
Nitrogen gas cylinder connected with the filter nitrogen port, closed the circulation pump into the base cutting small cycles, closed hydrogen, oxygen, emergency discharge valve, a discharge valve closed oxygen, hydrogen discharge opening a secondary valve, the hydrogen level adjustment switch position of the rotation of the manual operation of the hand given the knob, the hydrogen valve is fully open, open the dryer hydrogen inlet valve, the valve, the outlet throttle, the intake valve closed cabinet II. Through to the system filled with nitrogen, the pressure to 0.5MPa, open the dryer hydrogen gas main pipes hydrogen vent valve to discharge pressure to 0.05MPa, nitrogen again repeated three times, and finally the pressure was maintained at 0.3 ~ 0.4MPa, the hydrogen level switch in the automatic position.
2.3 regulating the circulation amount
1, check valves, it is in driving state.
2, open the lye pump and the circulation volume control valve
3, open the filter inlet valve base.
4. Open the drain valve oxygen hydrogen discharge valve
5, connected to an oxygen supply hydrogen analyzer, warm up for 30 minutes.
6, open hydrogen and oxygen gas path on both sides of the tower water draining valve drain the water.
2.4 Line Modules start
1. Open the rectifier cabinet and out of the cooling water valve.
2, for a given voltage, current setpoint counter-clockwise rotation in the end.
3, connected to the main power supply and control cabinet.
4. Press the start button is triggered.
5, the selection switch to the steady flow profile, slow clockwise rotation voltage given potentiometer, under level control allows the case to the rated voltage.
2.5 System Regulation
1, when the tank temperature is lower than 50 ℃, the system pressure is controlled at 0.5MPa.
2, control of oxygen, the oxygen level gauging show two towers in the quarter, try to keep the flat phase, when the gauge is below the minimum level, Taga open hydrogen valve (should normally open), water pump inlet valve, start water pump, when the level reaches 1/4 outage water pump.
3, when the tank temperature higher than 50 ℃, the pressure regulator setpoint gradually increased, the cell voltage stabilized at 1.6MP a. When the base temperature approaching 70 ℃, bath temperature setpoint should be increased slowly, finally stabilizing at 80 ℃.
4, when the pressure rises 1.0MP a, vote hydrogen oxygen analyzer, oxygen analyzer open hydrogen secondary intake valve, but also open hydrogen oxygen analyzer sampling the primary valve clockwise to open the valve, open analyzer intake secondary valve. Adjust the flow 200ml / min, turning hydrogen oxygen analyzer power on, warm 45 minutes, you can start measuring. (Note that with increasing pressure at any time to adjust the flow analyzer).
5, at rated voltage, the output current rating has been able to, will switch to a steady flow regulator files file, note the potentiometer given a spin to zero when switching current is adjusted to a given clockwise equipment design value. .
6, when the pressure rise in the nominal value, the system is stable, the level adjustment system is switched to automatic water position.
2.6 Investment dryer
1, when the hydrogen purity of 99.8%, more than 99.2% purity oxygen, hydrogen vent off the secondary valve, commissioning hydrogen drier.
2, open the dryer and export hydrogen valve.
3, open the throttle hydrogen gas dryer.
The switching operation of the dryer
3.1 hydrogen dew point temperature is greater than -30 ℃ to switch the dryer, the dryer had been regenerated into operation, failure to carry out the regeneration of the dryer. Open cooling systems inlet valve, drain water discharge door should be. Determine the working system and regeneration system.
3.2 Open regeneration good dry hydrogen valve import and export, import and export hydrogen drier closed valve failure.
3.3 periodically open water discharge valve of the gas-water separator.
4. Open the drain valve product hydrogen, nitrogen after the exclusion of the pipeline close the valve.
2.7 Hydrogen Storage
1, until the hydrogen humidity qualified, open framework Ⅱ into hydrogen valve.
2, open the hydrogen storage tank of hydrogen gas into the primary valve, secondary valve.
3, open water is drained.
4, when the hydrogen storage tank pressure is 1.25MPa, the hydrogen storage tank into the hydrogen off a valve, switching to another hydrogen tank.
Third, the parking operation
3.1 Under normal circumstances, the parking operation
1, the water pump switch to manual water position, water pump stops running. Close the valve and out of the dryer hydrogen, the hydrogen discharge valve opens.
2, the output rectifier cabinet potentiometer (for a given voltage, current setpoint) counter-clockwise rotation in the end, press the stop button is triggered, then cut off the main power and control power.
3, the temperature was given to zero, so that the cooling water valve is fully open (while holding down, the recorder should be transferred to a given pin is greater than the measured value, the cooling valve is closed).
4, when the temperature drops below 50 ℃, the pressure was gradually given to zero, the groove drop to zero. Cut off the circulation pump power supply, then cut off the gas and liquid control cabinet and processor power, control cabinet and then disconnect all power to the instrument, and finally cut off the main power control cabinet and instrumentation power, turn off the respective cooling valve.
5, grooves drop to zero, should cut off the hydrogen and oxygen analyzer power off for each sampling time valve, secondary valve, pressure reducing valve.
3.2 Operating pressure and temperature shutdown
1, the water pump switch to manual water position, water pump stops running.
2, the output rectifier cabinet potentiometer counterclockwise rotation in the end, press the stop button and then trigger off the main power and control power.
3, quickly close the hydrogen, oxygen discharge valve once.
4, cutting off power to the analyzer hydroxide, once close the sampling valve, secondary valve, pressure reducing valve.
5, the temperature was adjusted to a given pointer is greater than the measured value, the cooling valve is closed.
6 to keep the sides level is flat, then stop the circulation pump.
7, cutting off power supply to control cabinet and various power meter.
3.3 emergency stop operation
1, immediately press the stop button to trigger rectifier cabinet, cut off the main power supply.
2, the automatic water hit the manual water, water pump stops running.
3, open hydrogen and oxygen emergency discharge valve, pay attention to hydrogen, oxygen level showing.
4, the temperature recorder given pointers to zero, so that the cooling water valve is fully open.
5, cut off the power supply control cabinet, gas supply, cut off the power supply control cabinet control.
Fourth, the hydrogen feed to the generator operation
1, the generator room and informing the other party to send hydrogen to the engine room.
2. Open a hydrogen storage cylinder hydrogen gas cutting.
3, open to the hydrogen generator to send a cutting, the second cutting.
Often work for mutual displacement of hydrogen and nitrogen, carbon dioxide and nitrogen gas, carbon dioxide gas and air within four generators, medium replacement method should be used in the middle or vacuum replacement method.
4.1 air-cooled by the cold is converted to hydrogen (intermediate medium displacement method)
4.2 from the bottom of the generator filled with nitrogen or carbon dioxide gas, the exhaust gas from the upper part of the generator ,, maintain pressure within the generator at 2.94 × 10-3 ~ 5.88 × 10-3Mpa, and is discharged from the gas sampling and analysis, gas less than 3% oxygen content, carbon dioxide content greater than 85% of the electrical discharge notice dead, dead after row to stop replacement.
4.3 from the upper part of the generator filled with hydrogen, the exhaust gas from the bottom of the generator to maintain the power generator hydrogen 2.94 × 10-3 ~ 5.88 × 10-3Mpa, sampling and analysis from the exhaust gas, when the hydrogen purity greater than 96%. Oxygen content of less than 2%, the electrical discharge notice dead, dead after row, can be put into hydrogen purity meter, when the machine is raised to 0.294Mpa after fill hydrogen into automatic valves.
5.1 is converted to hydrogen-cooled by the air-cooled (intermediate medium method)
5.2 from the bottom of the generator filled with carbon dioxide gas, when analyzing exhaust gas or hydrogen content of less than 3% of the carbon dioxide content greater than 95%, the electrical discharge notice from the exhaust pipe sample dead, dead stop after row replacement.
5.3 from the upper part of the generator filled with compressed air, carbon dioxide gas is discharged from the bottom, from the exhaust gas sampling and analysis, when the carbon dioxide content of less than 10% is converted to air cooling.
Fifth, the normal operation and management
1 Under normal circumstances, the operator should always observe the operation of equipment, proper operation and timely recording parameters and exceptions, every two hours recording time, faced unusual circumstances promptly shut down processing.
2 according to the amount of hydrogen required by the situation, at any time adjust the power rectifier cabinet, rotary potentiometer output rectifier cabinet can not be too fast, to prevent over-current fault.
3 in the operation selector switch rectifier cabinet can not be arbitrarily changing positions, otherwise a fault will occur. To change the rectifying cabinet running, it must output potentiometer set to zero, in order to convert the position of the switch.
4 measured once each boot lye proportion, such as concentrations of less than 20%. It should supplement lye. Up base should be added at the time of shutdown. Complementary approaches: an open base box base valve 6A, open lye small circulation pump into the base cutting 8A, start circulating pump, circulating pump to open the exhaust valve, the exhaust air after closing open lye circulating regulation valve 7A, the base hit. into the cell, after lye finished, stop the circulation pump, shut alkali lye small circulation pump inlet valve 8A, the base tank base valve 6A.
5 Have the tank frequently observed demineralized water and the cooling water flow is normal.
.6 Frequently observed hydrogen, oxygen analyzer and a gas flow meter desiccant discoloration, the timely replacement of the desiccant and adjusting the flow rate and boric acid tablets.
7 regularly clean the filter, first turn when general cleaning once a week, three months after each cleaned once a month, clean the filter should be carried out at the time of shutdown, first turn off the filter inlet and outlet doors, folding under the filter cover, remove a filter with demineralized water will clean, and then loaded into the filter, installed flange cover, it can be used after confirmation does not leak.
8 Note lye circulation amount can not be too large or too small, to regulate the amount of circulating through the lye circulation regulating valve.
9 every month for each alarm equipment and protection equipment to conduct a test signal test before starting every year to deal with a full set of equipment for repair and instrument calibration.
On (pilot projects aerobic liquid limit; on liquid hydrogen, lower limit; upper trough pressure; hydrogen pressure limit; lower limit of the gas source; bath temperature limit; lower limit of the amount of alkali circulation and other alarm hydrogen side, the oxygen side, the cooling water control valve film. switch test groove pressure is too high, the bath temperature is too high, the lower limit of the amount of circulation, control cabinet interlock.)
10 cell overhaul, replace all asbestos diaphragm and gasket overhaul every five years.
11 rectifier cabinet as a failure in the operation, should be excluded after fault current, voltage, given counterclockwise rotation in the end, press the reset button, and then restart.
12 weekly water hydrogen machine, a dryer gas-liquid separator sewage once.
13 Analysis of hydrogen purity once every two hours, copy hydrogen hygrometer hourly, every four hours once a manual analysis of hydrogen humidity and the results to fill in the report.
14 monthly daytime replace Austria's gas analyzer used drugs.
15 Tuesdays analysis of the hydrogen storage tank of hydrogen purity (≥99.5%), Wednesday analysis of the hydrogen storage tank of hydrogen gas humidity (≤-25 ℃), if failed, the report shall monitor and inform the Ministry of drainage and electricity In other hydrogen until qualified.
16 Zero class of each hydrogen storage tank drain again.
17 rows of work at stake hydrogen, hydrogen Point sampling was conducted to carefully, carefully, to ensure accurate, and the last three times the sample to be analyzed, and verified correct, in order to pass.