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About UsQingdao Power Station Valve Co., Ltd. (formerly known as Qingdao Power Station Valve Factory) was established in September 1965 and is located in the coastal city of Qingdao. It is a professional manufacturing factory designated by the former Ministry of Mechanical and Electrical Affairs as a high-temperature and high-pressure valve product for power station boilers.
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ProductsThe product range covers gate valves, globe valves, check valves, safety valves, control valves, blocking valves, throttle valves, butterfly valves, high and low pressure bypass valves, high pressure three-way valves, temperature and pressure reduction devices, etc. for power plant boilers and steam turbine pipelines with subcritical and ultra (ultra) critical parameters.
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BlogThe company is an expert unit of the National Boiler and Pressure Vessel Standards Committee, leading or participating in the development of more than ten valve manufacturing and inspection standards, and possessing over twenty product technology patents.
Turbine bypass system valve
Product Details
Unit-type units generally have bypass systems to cooperate with the start-up and operation of steam turbine generator units.
Bypass systems are generally divided into two series systems: high-pressure bypass and low-pressure bypass, and their capacities can have different configurations. A bypass is a device that allows main steam to bypass the steam turbine and directly discharge to the condenser through desuperheating and pressure reduction. The drive methods are electric, pneumatic, and hydraulic. Generally, bypasses also have their own control cabinets. If the operation part is integrated into the DCS, it is also called a simplified bypass.
The main functions of the steam turbine bypass system:
1) Protect the reheater;
2) Improve start-up conditions and accelerate start-up speed;
3) Recover working fluid and eliminate noise;
4) Use the bypass to achieve intermediate-pressure cylinder start-up.
Functions of the steam turbine bypass system:
(1) Improve unit start-up performance. In the initial stage of unit start-up, the steam parameters have not yet reached the conditions for steam turbine rolling. This part of the steam flows to the condenser through the bypass system to recover the working fluid and meet the requirements of system warming and energy storage. Especially during hot start-up, the boiler can operate with a larger combustion rate and higher evaporation rate to accelerate the increase in steam temperature, making it match the metal temperature of the steam turbine, thereby shortening the start-up time.
(2) Meet the requirements of constant pressure and sliding pressure operation of the unit. During unit start-up, the main steam pressure and the intermediate-pressure cylinder inlet pressure can be controlled; during normal operation, the boiler outlet pressure is monitored to prevent overpressure.
(3) During start-up conditions or steam turbine tripping, the bypass system can ensure that the reheater has a certain steam flow rate, so that it can be sufficiently cooled, thus playing a protective role.
(4) Shorten the safety valve action time or prevent it from lifting during accident conditions. During grid accidents, the unit can maintain a low load with plant power for a short time; during steam turbine accidents, the boiler is allowed to be in hot standby, shutting down without shutting down the furnace, and power generation can be quickly restored after the fault is eliminated. Reducing downtime is beneficial to the stability of the entire system. In short, the bypass system has three functions: start-up, overflow, and safety.
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Hotline: +86-0532-86083651
Email: 13853228327@163.com
Website: www.qingdianfa.com
Address: No. 29 Ruijin Road, Licang District, Qingdao City, Shandong Province, China
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