Thermal power plant smoke depth cooler heat return optimization on-line monitoring device and method

Abstract

The invention provides a thermal power plant smoke depth cooler heat return optimization on-line monitoring device and method. The device comprises a heat return optimization analyzing and computing server, a plant-level monitoring information system SIS (safety instrumented system) and a thermal generator set DCS (distributed control system), wherein the thermal generator set DCS comprises a smoke depth cooler thermodynamic system, a smoke system and a steam system; and the method comprises the following steps of: reading on-line monitoring data, judging whether the smoke discharge temperature is within a safe running range or not, computing the designed condensed water flow of the smoke depth cooler, adjusting the condensed water flow of the smoke depth cooler, computing the optimized condensed water flow of the smoke depth cooler, reading the on-line monitoring data of a steam system and a condensed water system in the power plant, computing the standard coal saving quantity after the smoke depth cooler runs, confirming the optimal distribution mode and running parameter of the smoke depth cooler, and adjusting a heat return system of the smoke depth cooler to be optimized on the line. According to the invention, the on-line monitoring and adjusting of a parameter-variable heat return optimization system can be realized.

Description

technical field [0001] The invention belongs to the technical field of waste heat utilization in thermal power plants, and in particular relates to an on-line monitoring device and method for heat recovery optimization of flue gas deep coolers in thermal power plants. Background technique [0002] The exhaust gas temperature of a thermal power plant is one of the main performance indicators of boiler design, which is related to the economy and safety of power plant boilers. The exhaust gas temperature is generally around 120°C to 140°C, and for boilers burning high-sulfur fuel, the exhaust gas temperature is around 140°C to 150°C. However, the actual operating value of the exhaust gas temperature of many thermal power plants in my country is about 20-50°C higher than the design value, and the heat loss of the exhaust gas is large. The analysis shows that when the operating exhaust gas temperature increases by 10°C, the boiler efficiency decreases by about 0.5% to 0.7%, and ...

AI Technical Summary

Problems solved by technology

Therefore, when the parameters of the retrofitted heat recovery system change, the existing technology cannot realize the on-line monitoring and regulation of the heat recovery optimization of the flue gas deep cooler, which affects the economy of the whole plant

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