Compressor integration and safe operation start up for atmospheric operation of SOEC systems
A compressor for a solid oxide electrolyzer cell (SOEC) system, the system including one or more stamps that receives hydrogen input and outputs wet hydrogen, a heat exchanger or condenser that is configured to decrease the temperature of the wet hydrogen, a compressor that is configured to increase the pressure of the wet hydrogen, and a dryer that is configured to reduce the dew point of the wet hydrogen.
1. A solid oxide electrolyzer cell (SOEC) system comprising:
generator modules comprising stacks of electrolyzer cells and that receive steam and output a hydrogen product comprising hydrogen and steam;
a heat exchanger or condenser configured to cool the hydrogen product output from the generator modules;
a compressor configured to pressurize the hydrogen product output from the heat exchanger or condenser;
a dryer configured to reduce a dew point of the hydrogen product output from the compressor;
transition valves-configured to control an amount of the hydrogen product output from the generator modules that is vented and an amount of the hydrogen product output from the generator modules that is provided to the compressor, based on an operating state of the compressor; and
isolation valves configured to relieve suction line pressure between the compressor and the generator modules in response to a fault event of the compressor,
wherein the transition valves comprise:
a first globe valve configured to control venting of the hydrogen product; and
a second globe valve configured to control flow of the hydrogen product from the heat exchanger or condenser to the compressor, and
wherein the isolation valves comprise:
a first pneumatic valve configured to control venting of the hydrogen product; and
a second pneumatic valve configured to control flow of the hydrogen product from the heat exchanger or condenser to the compressor.
2. The system of claim 1 , further comprising a suction knockout drum configured to maintain the pressure of the hydrogen product provided to the compressor.
3. The system of claim 2 , wherein the suction knockout drum is configured to remove water from the hydrogen product.
4. The system of claim 1 , wherein when the compressor is less than fully operational and the generator modules are fully operational, the system is configured to open the first globe valve to vent the hydrogen product.
5. The system of claim 1 , wherein when the compressor and the generator modules are fully operational, the system is configured to close the first globe valve and open the second globe valve, such that all of the hydrogen product is supplied to the compressor.
6. The system of claim 1 , further comprising a gas analyzer configured to detect the composition of the hydrogen product output from the dryer.
7. The system of claim 6 , wherein the gas analyzer is configured to control the operation of the dryer, based on the detected composition.
8. The system of claim 1 , further comprising a manifold configured to supply hydrogen to the generator modules.
9. A method for operating a solid oxide electrolyzer cell (SOEC) system, comprising;
operating generator modules comprising stacks of electrolyzer cells to generate a hydrogen product comprising hydrogen and steam;
cooling the hydrogen product in a heat exchanger or condenser to generate a cooled hydrogen product;
compressing the cooled hydrogen product output from the heat exchanger or condenser in a compressor to generate a compressed hydrogen product;
drying the compressed hydrogen product output from the compressor in a dryer to generate a dried hydrogen product;
actuating isolation valves to relieve suction line pressure between the compressor and the generator modules in response to a fault event of the compressor; and
actuating transition valves to control an amount of the cooled hydrogen product that is vented and an amount of the cooled hydrogen product that is provided to the compressor, based on an operating state of the compressor or an operating state of the generator modules,
wherein the transition valves comprise:
a first globe valve configured to control venting of the hydrogen product; and
a second globe valve configured to control flow of the hydrogen product from the heat exchanger or condenser to the compressor, and
wherein the isolation valves comprise:
a first pneumatic valve configured to control venting of the hydrogen product; and
a second pneumatic valve configured to control flow of the hydrogen product from the heat exchanger or condenser to the compressor.
10. The method of claim 9 , further comprising providing hydrogen to the generator modules during startup and shutdown of the generator modules.
11. The method of claim 9 , further comprising maintaining the pressure of the cooled hydrogen product provided to the compressor using a suction knockout drum.
12. The method of claim 11 , further comprising providing a regulated flow of the cooled hydrogen product to the suction knockout drum.
13. The method of claim 9 , further comprising:
detecting the composition of the dried hydrogen product output from the dryer; and
controlling the dryer based on the detected composition.
14. The method of claim 9 , wherein the isolation valves are actuated to relieve the suction line pressure between the compressor and the generator modules within three seconds of the fault event of the compressor.