Issues regarding the first start-up of a turbine expander

This post was last edited by rzs20000 on 2012-5-4 at 18:41. I. Pre-driving preparations and inspection items: 1. Check whether there are any foreign objects inside the turbine unit； 2. Fill the fuel tank with fuel until the normal level is reached ； 3. Inspect it in accordance with the requirements of the fuel supply device. 4. Check whether the oil filter is clean ； 5. Are the filters installed in the inlet pipes of the expander and booster correctly? ； 6. Are all instrument control and electrical control circuits and devices properly connected? ； 7. Are all valves in the correct “open” and “closed” positions? ； 8. Is the seal gas connection correct? ； 9. Check the proper operation of the nozzle control valve ； 10. Check that the emergency shut-off valve operates correctly (it should close within 1 second from the open position). II. Expander startup: 1. Pre-startup checks: . (1) The oil level indicator in the fuel tank is normal. (2) The heating gas valve is closed ； (3) Nozzle vanes closed ； (4) Emergency shut-off valve closed ； (5) Close the inlet and outlet valves of the expander ； (6) Close the inlet and outlet valves of the booster pump ； (7) Fuel tank temperature: If it is below 15°C, the fuel heater should be turned on to heat it ； (8) Bearing temperature: As long as the temperature of any bearing is below 15°C, lubricating oil must be supplied to heat the bearing (Note: sealed gas must be supplied first); if this does not work, heating gas must be used to heat the expander (see III, IV, 2, (2)). (9) The oil filter is clean, and the fuel supply system is functioning properly ； (10) The booster return valve is fully open (as a condition for starting the expander) ； The instrumentation and control systems are functioning normally. : 2. Start the expander ； (1) Connect the seal gas and process gas supplies ； (2) Connect the instrument’s electrical power supply ； (3) Start the oil pump ； (4) Supply cooling water to the oil cooler (if the oil temperature is low, water supply can be postponed), and at the same time supply cooling water to the gas cooler behind the booster ； 　 (5) Open the expansion turbine outlet valve ； (6) Open the expansion turbine inlet valve ； (7) Open the booster outlet valve ； (8) Open the booster pump inlet valve ； (9) Open the nozzle control valve to 30% of the design operating condition ； (10) The emergency shut-off valve is opened, the turbine starts to operate, and quickly reaches a lower speed. Immediately increase the nozzle control valve to bring the rotational speed to 40% of the design value (except during the running-in period of the sealer, when low-speed operation is permitted according to the General Operating Instructions for Pressurized Turbine Expansion Units, normal operation should try to avoid running at low speeds). (11) Gradually open the nozzle control valve, while gradually closing the booster pump return valve, until the rated operating conditions are reached ； (12) During startup, as the inlet temperature of the expander decreases, its speed also drops; therefore, it is necessary to adjust this by frequently closing the booster return valve ； 　 (13) Check the bearing temperature at all times during startup. Is the clearance pressure normal and is the overall operation of the machine in order? ； 　　 (14) During startup, briefly open the purging valves of the machine and instrument pipelines, then close them tightly. III. Inspections during operation: The inspection items during the unit’s operation are as follows: 1. Every two hours: (1) Inlet and outlet temperatures of the expander, inlet and outlet temperatures of the booster ； (2) Inlet and outlet pressures of the expander and clearance pressure, inlet and outlet pressures of the booster ； (3) Bearing temperature ； (4) Bearing oil inlet pressure, oil temperature ； (5) Sealing gas pressure.

I’m new here; thanks for the guidance~~! Thank you to the original poster for sharing

Is the reflux valve of the booster fully open during the first start-up of the turbine expander? Also, does a portion of the raw air entering the booster get diverted to the expander as well? Thank you

Basically, as long as all the conditions for starting your DCS are met, you can start it normally…

Our company is interested in extracting methane from the exhaust gases of ammonia synthesis, but the pressure of the syngas is 200 kilograms. We are wondering whether there are any turbochargers available, both domestically and internationally, that can recover this pressure energy Thank you all, gentlemen

When the expander is started, the return valve of the booster is fully open, and it is adjusted gradually based on pressure after startup. The raw air passes through the booster pump, then enters the main heat exchanger and subsequently the expander; that’s the process.