Determination system and method for optimal in-furnace air temperature of thermal power generating unit provided with air heater

Abstract

The invention discloses a determination system and method for the optimal in-furnace air temperature of a thermal power generating unit provided with an air heater. Field operation data are adopted, the highest power supply load of the thermal power generating unit under the conditions of fixed boiler inlet coal quantity and environment air temperature is taken as an optimization objective function, a univariate comparison method is adopted, the in-furnace air temperature of the unit is adjusted through the hot-side steam or hot water flow of the air heater, the power supply load of the thermal power generating unit is compared with the reference working condition, and if the power supply load is smaller than the reference working condition, the original reference working condition is still used as the reference working condition; if the power supply load is larger than the reference working condition, the operation working condition corresponding to the in-furnace air temperature is used as a new comparison reference working condition, the in-furnace air temperature of the unit is adjusted, and next iteration optimization is carried out. According to the system and the method, the highest power supply load of the thermal power generating unit under the conditions of fixed boiler inlet coal quantity and environment air temperature is taken as the optimization objective function, the optimal control value of the boiler inlet air temperature of the thermal power generating unit under the boundary conditions of different boiler inlet coal quantities, environment air temperatures and the like is obtained online, and the purposes of the highest power supply load and the maximum profitability are achieved.

Description

technical field [0001] The invention belongs to the technical field of energy saving and consumption reduction, and relates to a system and a method for determining the optimum furnace inlet air temperature of a thermal power unit equipped with an air heater. Background technique [0002] Coal-fired boilers in power stations usually adopt heaters to avoid the danger of low-temperature corrosion on the heating surface at the rear. The air heater is arranged in the air duct from the outlet of the primary fan (including the blower) to the inlet of the air preheater. According to the form of heat source, air heaters can be divided into steam air heaters and hot water air heaters, among which steam air heaters are standard configurations for the design and construction of coal-fired power stations, and the steam source is taken from the auxiliary steam header; hot water air heaters The heat exchanger is a form of waste heat utilization that appears in the energy-saving transform...

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Problems solved by technology

[0020] The purpose of the present invention is to provide a thermal power unit equipped with an optimal furnace air temperature for thermal power units that has problems such as heavy workload, deviation from actual results, and high operating requirements in the existing method for optimizing the temperature of the thermal power unit. The system and method for determining the temperature. The present invention adopts the on-site DCS operation data of thermal power units, takes the highest power supply load of the unit under the condition of constant boiler coal input as the optimization objective function, adopts the single variable comparison method, and obtains the configuration temperature by adjusting the operating parameters. The optimal control value of the air temperature entering the furnace of the thermal power unit of the fan under different boundary conditions such as ambient temperature and power supply load

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