High back pressure heat supply unit safety control method

Abstract

The invention relates to a high back pressure heat supply unit safety control method which solves the problem that a steam turbine is forced to be split due to the high exhaust back pressure of the steam turbine. The high back pressure heat supply unit safety control method comprises the following steps that when any condition of high-pressure heater splitting or steam extraction user splitting ismet and the condition that the current steam turbine electric load value is greater than the preset steam turbine electric load value or the current steam turbine main steam flow value is greater than the preset steam turbine main steam flow value is met, an auxiliary machine failure load reduction RB function module is started, and action instructions are issued to a steam turbine digital electro-hydraulic control system and a boiler control system; the opening degree of a steam turbine steam inlet regulating valve is closed by calculating an integrated valve position command, the boiler control system is put into operation of oil gun putting, powder withdrawal, powder feeder stopping and powder discharge machine stopping; and when the current steam turbine electric load or the steam turbine main steam flow restores to the target range, the exhaust gas back pressure of the steam turbine can be reduced, and the problem of overrun tripping caused by the high electrical load of a steamturbine is solved.

Description

technical field [0001] The invention belongs to the field of safe operation of a steam turbine unit, and in particular relates to a safety control method for a high-back pressure heating unit. Background technique [0002] With the increasing demand for heating in northern cities and the country's promotion of clean heating to protect the blue sky, energy conservation and emission reduction, and efficient use of energy, cogeneration has become the main direction for the development of large and medium-sized cities. [0003] Compared with separate power generation and heating, cogeneration has strong energy saving and environmental protection advantages, whether from an energy perspective or an economic perspective. Foreign residents are relatively scattered, and cogeneration mostly adopts small cogeneration (power generation not exceeding 100kW), micro cogeneration (power generation not exceeding 15kW), and trigeneration of heat, power and cooling. However, my country's hea...

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Problems solved by technology

However, this solution is limited by steam users and heating temperature, the amount of steam that can be increased is limited, and it cannot solve the problem of steam turbine tripping

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