Optimal control method for heat economy of heating steam extraction units

Abstract

The invention provides an optimal control method for heat economy of heating steam extraction units, and directly provides a calculation method for critical economic flow Fc of the heating steam extraction units. When heating steam extraction flow F is larger than the heating steam extraction critical economic flow Fc, the heat consumption of the units under the heating working condition is smaller than that under the straight condensing working condition, and the heating steam extraction is energy-saving; and when the heating steam extraction flow F is smaller than or equal to the heating steam extraction critical economic flow Fc, the heat consumption of the units under the heating working condition is larger than or equal to that under the straight condensing working condition, and theheating steam extraction is not energy-saving. According to the method, the heating steam extraction capacity distribution among the plurality of units under each electrical load condition is reasonably planned, so that the heat economy of the whole plant is optimized; and meanwhile, errors caused by manual adjustment of operators are avoided, the labor intensity of the operators is alleviated, the heat economy of operation of the heating steam extraction units is improved, finally, the method is simple and easy to implement, and the automatic operation level of the units is improved.

Description

technical field [0001] The invention belongs to the field of power plant boiler and steam turbine systems, and in particular relates to an optimization control method for the thermal economy of a heating extraction unit. Background technique [0002] In the context of increasingly severe energy constraints and economic development, research on increasing revenue and reducing expenditures in the power industry is an effective choice for adjusting and optimizing the energy structure. Coal-fired power plants that implement cogeneration and central heating can not only gain benefits from heating itself, but also reduce coal consumption and cost of power generation through heating, while improving energy efficiency and reducing pollutant emissions. [0003] Heating extraction steam heating is a very common and important production mode of combined heat and power units, and its thermal economy has a critical impact on the energy consumption level of thermal power units. When the ...

AI Technical Summary

Problems solved by technology

In actual operation, when the power plant has multiple heating units, unreasonable steam distribution may cause the steam supply of individual units to be less than the critical point of steam extraction energy consumption under partial load conditions, increase the energy consumption of the units, or fail to achieve the most economical Operating conditions

Due to improper selection of heating extraction steam flow and extraction pressure, the energy consumption level of cogeneration units has not been reduced due to heating allocation, and some thermal power plants have even experienced a substantial increase in coal consumption, and the phenomenon of coal loss in coal yards

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