The turbine won’t open

Is it domestic? There are some issues with it; imported ones are better, but we still need to support domestic products

We will provide the necessary conditions to contact the manufacturer’s on-site technical support, so that the system can be put into operation under their guidance.

I. Pre-startup checks During the startup process of a turbine-driven centrifugal compressor, both the turbine and the compressor accelerate from a stationary state to their rated speeds, heat up from room temperature to the temperature required for operating at rated capacity, and the pressure at the compressor outlet rises from a low level to the rated pressure. The operating conditions of all the components of the machine undergo significant changes during this process. Preparatory work before startup is the first step in the operation process; it is an important condition for ensuring that the startup can take place smoothly and safely. Neglecting these preparatory steps may delay the unit’s startup and prevent it from coming online on time, and in severe cases, it can even cause damage to the equipment. 1. Inspection and preparation of the steam turbine: Thoroughly inspect the main steam valve, control valves, and other safety devices to ensure that they operate smoothly and accurately ； The transmission mechanisms of the control system should be lubricated; screws, pins, and lock nuts must be properly installed and in good condition. The travel range of the hydraulic actuators and control valves should meet the specified requirements. The turbine, as well as the couplings, gearboxes, and compressors, must all be in good working condition. The vent and drain valves on the cylinders and new steam pipes should be open ； All other valves that affect the vacuum during startup, as well as those that allow steam and water to flow back into the cylinders, must be in the closed position. The insulation for cylinders, high-temperature pipes, and their valves should be in good condition. Correct the displacement and expansion readings; if possible, record the original values such as cylinder expansion, relative expansion, axial displacement, and temperatures of the upper and lower cylinders of the turbine in its cold state before starting it up. 2. Inspection and preparation of the compressor: Check whether the shaft alignment between the turbine, coupling, gearbox, and each cylinder of the compressor meets the requirements, and ensure that the connections are secure. The crankshaft rotation is used to check whether there is any rubbing between the compressor rotor and stator, as well as to verify that the gears in the transmission are engaging properly. Check whether the gas pipeline installation, supports, and various spring mounts are appropriate, and whether the expansion joints can expand and contract freely. 3. Inspection and preparation of measuring instruments and signals: Check whether the instruments and signals at each monitoring location are complete ； The indicated readings of the instruments should be verified and calibrated ； Tests were conducted with the remote control instrument in conjunction with the main control room to confirm normal operation. 4. Inspection, testing, and adjustment of the oil system: Check the oil level in the tank; if it is low, add oil. Inspect the oil level gauge as well as the oil temperature. If the temperature is below 23°C, use a heater to keep the oil temperature above 23°C. The oil coolers and oil filters should be filled with oil, and any air should be removed. The cooling water system of the oil coolers should also be checked. The switch valves for the oil coolers and filters must not be placed in the wrong position; they should be set to the side that needs to be in use. Turbine startup: 1. Adjust the oil temperature and pressure, and check the pressure drop across the filters as well as the oil level in the high-level oil tank. 2. Heat the pipes. When starting a turbine when it is cold, as steam enters the cold steam pipes, the pipe walls heat up, causing their temperature to rise; at the same time, the steam rapidly condenses into water. Therefore, the warm pipe must work in close coordination with the pipeline’s drain system, so that the condensate accumulated in the pipe can be drained promptly and water hammer in the pipeline is prevented. 3. Drainage: Before heating the pipes and starting up the system, it is necessary to check whether the drainage system is functioning properly. The drain valves and traps located on the main steam pipes, above and below the main steam valves, as well as on the turbine itself, must all operate reliably. 4. Cranking: When the unit is started, if steam is introduced to the rotor while it is at rest rather than while it is in motion, the rotor will undergo uneven thermal deformation, causing it to bend upward. This affects the radial clearance, leads to vibrations, and may even result in accidents. 5. Creating a vacuum: Before the rotor of the vacuum condensing steam turbine is started, equipment such as the circulation water pump, condensate water pump, and extractor is already in operation, with the aim of creating the necessary starting vacuum. 6. Warm-up and acceleration: After the rotor is started, a warm-up and acceleration process is required before the speed reaches the rated value. The purpose of warming up is to ensure even heating of the turbine components, reduce temperature differences, and prevent excessive thermal deformation and thermal stress.