A method for controlling the reheat steam temperature of a double reheat unit

A technology of reheating steam temperature and secondary reheating, which is applied in the control of superheating temperature, steam superheating, steam generation, etc. It can solve the problems of reheating steam temperature fluctuation, slow adjustment speed, and difficult adjustment of reheating steam temperature , to achieve the effect of ensuring safe and stable operation
CN109654475BActive Publication Date: 2020-09-04NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GROUP
Publication Date
2020-09-04

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Abstract

The invention discloses a secondary reheating unit reheating steam temperature control method. The secondary reheating unit reheating steam temperature control method comprises a flue gas recirculation fan variable-frequency control method and a flue gas adjusting baffle opening degree control method; and a leading differential feedforward unit for the reheating steam temperature after water spraying and a feedforward unit for load changing are arranged in each control method, and meanwhile an overriding and locking control unit for special circumstances is arranged in each control circuit. According to the secondary reheating unit reheating steam temperature control method, the problems that the primary reheating steam temperature and the secondary reheating steam temperature of an ultra-supercritical secondary reheating unit intercouple with each other and are low in adjusting speed are solved, the total heat absorption capacity of a primary reheater and a secondary reheater is controlled through flue gas recirculation fan variable-frequency controllers separately, the primary reheating steam temperature and the secondary reheating steam temperature are controlled through reheater flue gas adjusting baffles, the control measures such as feedforward, overriding and locking are taken, the control precision and the response speed of the primary reheating steam temperature and the secondary reheating steam temperature of the ultra-supercritical secondary reheating unit are achieved, and meanwhile safe and stable running of the unit is guaranteed.
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Description

technical field

[0001] The invention belongs to the technical field of ultra-supercritical double reheating unit control, and relates to a method for controlling the reheating steam temperature of a double reheating unit, in particular to a method for controlling the reheating steam temperature of a boiler for a double reheating thermal power unit. Background technique

[0002] According to the national sustainable development strategy and energy-saving and emission-reduction requirements, the thermal power industry has developed towards higher parameters in recent years, and supercritical, ultra-supercritical, and even double-reheat thermal power generating units have emerged. At present, domestic reports have already The number of double-reheat thermal power generating units put into operation is small, and the design of reheat steam temperature control scheme is still a difficult point in the control of double-reheat unit.

[0003] For the double reheat unit, the current ...

Claims

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