Correction calculation method for energy-saving amount assessment test of low-temperature economizer system

Abstract

The invention discloses a correction calculation method for an energy saving amount assessment test of a low-temperature economizer system. The correction calculation method comprises the steps: a, conducting performance tests under the working conditions of low-temperature economizer input and output according to ASME PTC6-2004 Steam Turbine Performance Test Regulations; b, calculating the actually measured heat consumption rate HRt of the steam turbine under the two working conditions; c, correcting the inlet flue gas temperature T7, the flue gas flow Mg, the flue gas specific heat capacityCg, the water supply main pipe flow F3 and the water supply main pipe temperature T3 by adding additional sub-loop iteration in the first type of correction calculation under the input working condition of the low-temperature economizer; d, carrying out second-class correction calculation to obtain the corrected heat consumption rate of the steam turbine under the two working conditions; and f, calculating the corrected heat consumption rate difference value under the two working conditions to obtain the energy-saving effect of the low-temperature economizer. According to the correction calculation method, the operation boundary condition of the low-temperature economizer can be corrected to a design value in the energy-saving amount assessment test of the low-temperature economizer system, so that the bifurcation or dispute of buyers and sellers to the energy-saving amount acceptance test result of the low-temperature economizer is avoided.

Description

technical field [0001] The invention belongs to the field of thermal performance tests of generator sets, and in particular relates to a correction calculation method for a low-temperature economizer system energy-saving assessment test. Background technique [0002] Coal-fired power plant boiler exhaust heat loss is the largest proportion of boiler heat loss, accounting for about 60% to 70% of the total loss of the boiler, accounting for 5% to 8% of the total input heat of the boiler. Adding low-temperature economizer for waste heat utilization in the tail flue of the boiler is a widely used method to reduce the exhaust gas temperature and improve the energy efficiency of the unit. After adding the low-temperature economizer, the energy efficiency change of the unit is mainly reflected in: the condensed water absorbs part of the exhaust heat of the boiler, which reduces the amount of steam extracted from the steam extraction port of the low-pressure cylinder of the steam tu...

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Problems solved by technology

In this kind of performance assessment test using steam turbine performance test to evaluate the energy saving of low-temperature economizer, if the correction of relevant operating parameters of low-temperature economizer is not considered, the calculated energy-saving effect of low-temperature economizer can only represent the test state conditions The energy-saving effect of the low-temperature economizer cannot be directly compared with the guaranteed energy-saving effect of the low-temperature economizer

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