Sequential control start method of double-machine heat regenerative small steam turbine

Abstract

The invention discloses a sequential control start method of a double-machine heat regenerative small steam turbine. The sequential control start method of the double-machine heat regenerative small steam turbine includes: judging out that a small machine is in a start allowing state and an auxiliary system is in a normal state, and setting an air exhaust check valve, a steam supplement valve andan overflow valve in an automatic mode; judging out that the air exhaust check valve, the steam supplement valve and the overflow valve are in a closing state, setting trap valves in an automatic state, and controlling the trap valves to stay for a preset period after the trap valves are in the automatic state; judging out that a small steam turbine lubricating oil system is in normal status; judging out that a small steam turbine main throttle valve is closed and has no fault, and controlling rotation speed of a feed pump turbine on a feed pump turbine turning belt to be larger than preset rotation speed value; judging out that the main throttle valve and a main regulation port are in close status, controlling a by-pass valve to open, and controlling the exhaust steam overflow valve to close; judging out that steam has qualified quality, starting a heating turbine according to set rotation speed of the heating turbine, and enabling the steam supplement valve and the overflow valve tokeep close during the working process of the heating turbine; judging out that the heating turbine stops work, and setting tracking value of the rotation speed to preset target value; judging out thatthe actual rotation speed reaches the preset target value, setting steam exhaust pressure at preset pressure value, and setting by-pass control in an automatic mode.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a sequential control start-up method of two-machine reheating small steam turbines. Background technique [0002] With the development of thermal power generation technology and the continuous improvement of unit parameters, the steam temperature, pressure and extraction superheat of the unit are getting higher and higher. For example, developed countries such as Europe, America and Japan are developing the next generation of ultra-supercritical units, whose temperature can reach 700 ℃. In order to adapt to such high-parameter working conditions, the required system equipment material characteristics and grade requirements will continue to increase, and the corresponding procurement and manufacturing costs will continue to increase. For this reason, some organizations have proposed a dual-machine recuperation scheme: by adding a high-parameter, high-power extraction ba...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a sequential control start-up method for two-machine reheating small steam turbines to solve the technical problem that the existing sequential control start can only be manually operated by the staff, so that the two-machine reheating can be realized through the coordinated control of the automatic control sequence. The automatic start-up of the water pump turbine reduces the operator's manual operation pressure and also improves the start-up efficiency of the feed water pump turbine

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