Flexible coordination control method for external steam supply unit

Abstract

The invention discloses a flexible coordination control method for an external steam supply unit, The method comprises steps that external steam supply flow is subjected to dimensional conversion to obtain converted load, converted pressure and converted feed water flow are obtained through dynamic correction, the converted pressure is subjected to dynamic correction through a comprehensive flow PID closed-loop controller and then overlaid with a conventional main steam pressure setting loop, the final main steam pressure set value is obtained; the converted feed water flow is superposed with a conventional feed water flow setting loop to serve as a final feed water flow set value; the converted load and the conventional boiler master control output are superposed as final boiler master control output; after the external steam supply mode is input, the source of a BTU fuel quantity set value is switched from actual power to main steam flow, and the source of an oxygen quantity set value is switched from a load instruction to main steam flow. on the premise that the external steam supply requirement is guaranteed, the steam output of the boiler is increased, the unit electrical load responds to the power grid requirement to the maximum extent, and the boiler dynamically matches the external steam supply requirement and the electrical load requirement.

Description

Technical field [0001] The present invention relates to the field of control of a fire generator set configured with industrial vapor or heating, and is particularly related to a flexible coordination control method of external vapor unit. Background technique [0002] For thermal generator sets configured with industrial steam or heating, the routine coordination control system does not take into account the influence of external steamy, industrial steam or heating steamping, and the operators usually manually change the main vapor pressure bias. Coal quality correction coefficient, oxygen-bias, etc. to adjust the boiler. Therefore, during the unit change load during the external duck, the operator needs manual intervention to meet the user's heating demand, the work labor intensity is high; in addition, during the changeload process, there is a problem with the imbalance of water coal ratio, main steam The main parameters such as temperature and main steam pressure are large, a...

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Problems solved by technology

[0002] For thermal power generating units equipped with industrial steam supply or heating steam supply, the conventional coordinated control system does not take into account the impact of external steam supply, that is, industrial steam supply or heating steam supply, on the thermal efficiency of the unit. Operators usually manually change the main steam pressure bias, Coal quality correction coefficient, oxygen offset and other auxiliary parameters to adjust boiler output

Therefore, during the load changing process of the unit during the external steam supply period, the operating personnel need to manually intervene to meet the heating demand of the user, and the work is labor-intensive; The main parameters such as temperature and main steam pressure fluctuate greatly, and it is difficult to balance the economy and safety of the unit; because part of the steam is used for external steam supply, the amount of steam entering the steam turbine for power generation is reduced. Requirements, the steam turbine inlet valve has to be opened large, even fully open can not fully meet the requirements of the grid; because the steam turbine inlet valve is fully opened, when the grid frequency is lower than the rated frequency (50Hz) and the generator set is required to increase power generation quickly, the steam turbine There is no room for further opening of the steam inlet control valve, resulting in a frequency response quality that cannot meet the needs of the power grid, and there is a risk of increased assessment

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