OPERATING METHOD OF HEAT EXCHANGER

摘要

PROBLEM TO BE SOLVED: To provide a practical operating method of a heat exchanger, configured to prevent the scale from depositing on a heat transfer face and/or a flow channel wall surface of a heat exchanger, or to remove the scale deposited on the heat transfer face and/or the flow channel wall surface.

SOLUTION: A gas-liquid mixed phase flow is formed by injecting a return gas to a gas cooling water inlet section 61 through a return gas supply pipe 81, with respect to a gas cooling water cooler 51 for cooling the gas cooling water sprayed to the return gas, used in a cooling tower 31 for cooling the return gas circulated in a fuel gas return line 15 of a blast furnace gas firing gas turbine power generation plant 1. The gas-liquid mixed phase flow is supplied to the gas cooling water cooler 51 to remove the scale deposited on the heat transfer face and/or the flow channel wall surface of the gas cooling water cooler 51. The gas-liquid mixed phase flow discharged from the gas cooling water cooler 51 is supplied to the cooling tower 31.

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