An optimal control method for an open circulating water cooling end system

Abstract

The invention relates to the field of circulating water systems of thermal power plants along the river or the coast, in particular, a system optimization control method for open circulating water cooling end. The existing system control method for coastal open circulating water cooling end ignores the influence of tidal level on the consumption of circulating water pump. Regardless of the operational reliability of other equipment, the invention provides a system optimization control method for open circulating water cooling end. The control method aimed the characteristics that the operationof the open circulating water cooling end system along the coast (along the river) is affected by multiple external environmental factors. The optimization control of circulating water pump is realized based on comprehensive consideration of equipment safety and reliability, such as the minimum pressure pmin and the cold end system economy of circulating water master pipe through multi-variable input such as load, tidal level, inlet water temperature, etc. The power consumption of circulating water pumps is reduced. Thus, the energy saving potentiality of the thermal power plant cooling end system along the coast (along the river) is effectively found out.

Description

technical field [0001] The invention relates to the field of circulating water systems of thermal power plants along the river or along the coast, in particular to an optimization control method for an open circulation water cooling end system, the control method is used for deep energy-saving optimization and frequency conversion circulating water pump unit operation. Background technique [0002] The cold-end system of a large-scale thermal power plant is an important part of the thermal power generation unit. It provides a stable cold source for the thermal cycle and takes away almost half of the heat generated by coal combustion through circulating cooling water. Because the circulating water pump consumes a lot of work Therefore, the cold-end system has huge energy-saving potential, but the open-loop water-cooled end system is greatly affected by environmental factors, and there are many factors that affect the economics of the cold-end system. For example, the main ste...

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Problems solved by technology

[0004] The technical problem to be solved and the technical task proposed by the present invention are to overcome the existing coastal open cycle cold-end system control method that takes the weather state (or circulating water inlet temperature) as a single input factor and completely optimizes the unit economy Objective, ignoring the impact of water source tidal level on the power consumption of circulating water pumps and the operation reliability of other equipment, the present invention provides an optimal control method for an open circulating water cooling end system, which comprehensively considers thermal cycle economy and equipment safety Reliability, change the operation mode of the cold-end system in real time according to external environmental factors such as load, tide level, and water inlet temperature, reduce the power consumption of the circulating water pump, and tap the energy-saving potential of the cold-end system

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