Three-stage bypass system of thermal power plant

Abstract

The invention discloses a three-stage bypass system of a thermal power plant. A boiler superheater, a connecting block, a movable block, a limiting plate, a balancing weight and a limiting cylinder are included, a safety valve upper cover is arranged above a safety valve body, fastening bolts are installed at the joint of the safety valve body and the safety valve upper cover, a limiting spring isarranged in the safety valve upper cover, the connecting block is arranged below the limiting spring, the movable block is installed below the connecting block, the limiting plate is arranged at thetail end of the movable block, the limiting plate is connected with the tail end of a connecting pipe, the balancing weight is connected to the upper portion of the connecting block, the limiting cylinder is arranged on the outer side of the balancing weight. and the limiting cylinder is mounted above the safety valve upper cover. The three-stage bypass system of the thermal power plant is provided with a high-pressure bypass and a medium-pressure bypass which are arranged on the boiler side, the rationality of overall arrangement of a turbine bypass system is fully considered, two-row arrangement of a steam turbine room is facilitated, and the construction cost of the steam turbine room is reduced.

Description

technical field [0001] The invention relates to the field of main reheat steam and bypass systems of thermal power plants, in particular to a three-stage bypass system of thermal power plants. Background technique [0002] At present, in order to adapt to the constant pressure and sliding pressure operation of the unit, improve the start-up performance of the unit in the cold state, warm state and hot state, and ensure that the reheater does not burn dry, all adopt high-pressure, medium-pressure and Low-pressure three-stage series bypass system, the high-pressure bypass is connected from the two main steam pipes in front of the ultra-high pressure cylinder inlet of the steam turbine, and then connected to the cold primary reheat steam pipe after temperature reduction and decompression, and the medium-pressure bypass is connected from the high-pressure cylinder inlet of the turbine The two branch pipes of the steam in the hot section of the previous reheating are respectively...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a three-stage bypass system for a thermal power plant to solve the problem that the pressure level of the safety valve proposed in the above background technology is very high, and it is easy to fail to return to the seat and easy to leak when it is overrunning; If it is arranged in the turbine room, the space of the turbine room will be occupied, and the unreasonable layout will increase the project cost.

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