System of high and low pressure bypasses

Abstract

The invention relates to a system of high and low pressure bypasses. The high pressure bypass comprises a high pressure steam transfer valve, a high pressure bypass water spray valve connected in series with the high pressure steam transfer valve, a high pressure water spray isolation valve arranged in front of the high pressure bypass water spray valve, and a medium pressure cylinder, a circulating pipeline and a condenser which enter and are connected in series with a high pressure cylinder of superheated steam. The low pressure bypass comprises a low pressure bypass steam transfer valve, a low pressure bypass water spray regulating valve connected in series with the low pressure bypass steam transfer valve, and a low pressure bypass water spray isolation valve, a condensate and feed water pump and a low pressure cylinder which are arranged in front of the low pressure bypass water spray regulating valve; and the low pressure cylinder which enters reheat steam through the circulating pipeline is connected in series with the medium and high pressure cylinders. The pipelines of the valves are connected either in a Z shape or right-angled bends. The system has the advantages that four-stage airflow throttling and depressurization are realized so as to prevent erosion and damage of the valves; the Z-shaped arrangement and the multichannel right-angled bends greatly reduce noise; and the compact design of the system can reduce the cost, has effect of resisting cavitation, and can prolong service life.

Description

technical field [0001] The invention relates to the technical field of steam turbine temperature and pressure reduction, and further relates to a high and low pressure bypass system used for steam turbine temperature and pressure reduction. Background technique [0002] The high-pressure bypass system is arranged on the steam turbine steam recirculation pipeline, which can reduce the pressure and temperature of the high-level steam to the adjustment and control system of the low-level pressure and temperature through the temperature and pressure reduction device. [0003] The high and low pressure bypass system operates under the combination of cold state, vapor state, hot state and high and medium pressure cylinders. It is easily damaged by high temperature and high pressure difference erosion and vaporization for a long time. At present, there are a small number of domestic enterprises producing this bypass system, and due to the difference in system layout and materials u...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects existing in the existing high and low pressure bypass systems, and provide a high and low pressure bypass system with multi-stage pressure reduction, anti-cavitation, small leakage, low noise, simple and reasonable structure, and long service life. road system

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