DEH control system and method under steam turbine distributed control system (DCS)

Abstract

The invention belongs to the technical field of steam turbine control, and discloses a DEH control system under a steam turbine distributed control system (DCS). A DEH control method comprises the steps that the magnitude of a moment of force is changed by increasing/decreasing the gas inlet quantity or gas inlet parameters of a steam turbine, the changes of the moment of force and a moment of resistance are balanced and adapted to changes of external loads, and the rotation speed of a unit is maintained to be unchanged basically; and steam flow D of a formula of steam turbine steam torque iscontrolled, the steam turbine steam torque MT is changed, the steam turbine steam torque MT is enabled to change along with changes of generator electromagnetic torque MG, the rotation speed n is maintained to be in a range of power supply frequency set by a power grid, and the steam turbine is powered. According to the DEH control system under the steam turbine DCS, an operation control system ofthe unit is changed into an integrated management network combining security, economy and high-efficiency, long-term safe and stable operation of the unit are ensured, and the quality of electric energy and the economy of the operation after grid-connection are improved.

Description

technical field [0001] The invention belongs to the technical field of steam turbine control, and in particular relates to a DEH control system and a control method under a steam turbine DCS system. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] From the creation of the first steam turbine by the Swedish engineer Laval to the present, steam turbines have made irreplaceable contributions to the development of human society and world industrial technology during the development process of more than 100 years. In foreign countries, steam turbine manufacturers are mainly concentrated in developed countries such as Europe, the United States, Japan, and Russia. With the rapid development of the industrial field, most of the steam turbine manufacturers are mainly steam turbines for power plants and power stations, and steam turbines for industries. Auxiliary, such as: SIEMENS of Germany, GE of the United S...

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Problems solved by technology

[0023] The key to solving the above technical problems lies in the associated control of power and steam extraction under special working conditions: when high-pressure, large-flow air extraction is required, the associated control of power and extraction, in addition to properly handling the thermal calculation of the steam turbine, steam intake In addition to the requirements of the balance relationship with the pumping, the matching of parameters in the adjustment system is also a problem that needs to be studied

Although the automation of operation, the improvement of manufacturing precision and the level of installation technology have reduced the failure of the steam turbine unit, but due to the complexity of the equipment, the diversity of operating parameters, and the user's blind spots on the best operating mode of various parameters, The operation effect of the highly efficient and energy-saving steam turbine is greatly reduced

This will also affect the service life of the steam turbine, and seriously affect the normal operation of the steam turbine unit

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