Next, let’s talk about the startup procedure for a condensing steam turbine.

With the widespread use of steam turbine equipment, manufacturers have made numerous design choices. Generally, the startup procedures for condensing steam turbines can be categorized into hot start, warm-state start, medium-temperature start, and cold-state start. Improper startup procedures can easily damage the equipment, disrupt its normal operation, reduce operational efficiency, and shorten its service life.

About Condensing steam turbine Device startup steps:

1. First, slowly open the main valve. As soon as the rotor starts rotating, immediately close the main valve slightly and maintain a steady speed. Carefully listen for any unusual sounds inside.

2. After confirming that everything is normal, open the main valve and preheat at a constant speed of 400–800 for 15–20 minutes. During this time, pay close attention to the temperature rise of the condensing turbine bearings as well as the expansion and vibration of various components.

3. After the unit is running normally, gradually open the main steam valve; typically, select 500 r/min for accelerating the speed.

4. When the speed approaches the rated speed, engage electronic control.

5. After the control valve starts operating, gradually open the main valve, then turn the handwheel half a turn in the reverse direction. Once the electrically controlled no-load operation is confirmed to be normal, proceed with various tests.

Therefore, to ensure the normal operation of a condensing steam turbine, we still need to pay attention to the correct sequence of startup steps during operation.

Impact Condensing steam turbine The reason for the exhaust steam temperature

The primary function of a condensing steam turbine is to convert the thermal energy of steam into mechanical energy. Widely used in numerous applications, it is a commonly employed rotary prime mover driven by rotating blades. During operation, the specific working principle of this type of equipment involves first directing the exhaust steam into a condenser, where the exhaust pressure is gradually reduced below atmospheric pressure. This process can drive various devices such as fans, pumps, and compressors. In practice, it has been observed that many condensing steam turbines experience abnormal exhaust temperatures during operation, which can adversely affect the overall operational status of the equipment. This article elaborates on the factors influencing... Condensing steam turbine Factors affecting exhaust steam temperature.

The common causes of high exhaust temperature are:

1. Circulating water system failure;

2. Water injection system failure;

3. Vacuum system leak;

4. Shaft seal leakage;

5. The condensate system has malfunctioned.

Generally speaking, the exhaust temperature corresponds to the vacuum level in the condenser. If the exhaust temperature is high, check whether the spray pressure and flow rate are too low, whether the water temperature is excessively high, and also verify whether the nozzles or filters are clogged. The vacuum at the outlet should also be appropriately increased. In condensing steam turbines, insufficient steam can lead to the removal of heat generated by friction between the remaining blades and the airflow, causing the exhaust temperature to rise abnormally. This phenomenon is commonly referred to as the "exhaust temperature rise during startup." Therefore, most power units are equipped with a low-load spray-water system, which is activated when the exhaust temperature rises abnormally.

When the steam turbine starts up, the steam is throttled, and the rotor of the regulating stage is pushed through the nozzles. After throttling, the entropy of the steam increases, and the enthalpy drop decreases. As a result, the steam temperature rises after the condensing steam turbine begins operating, and the overall steam consumption during the entire startup process is reduced before grid connection for power generation.

The above is the explanation provided by the editor on “the startup procedure for condensing steam turbines.” Does everyone understand now? We hope the information just explained will be helpful to you all.