Patent ID: 7275503
Filing Date: 2007-10-02
Classification: F22B,F28D,F28F,Y02E,Y10T

Abstract:
1. A construction method for an exhaust heat recovery boiler which generates steam by providing a plurality of heat exchanger tubes in a gas duct in which an exhaust gas flows generally horizontally, the construction method comprising: providing a heat exchanger tube bundle panel module, the heat exchanger tube bundle panel module comprising: a plurality of heat exchanger tube bundle panels positioned in a gas flow direction, the plurality of heat exchanger tube bundle panels including a plurality of heat exchanger tubes, upper and lower headers provided at opposing ends of the heat exchanger tubes, and vibration restraining supports provided at predetermined intervals to prevent contact between adjacent heat exchanger tubes in a direction transverse to the lengthwise direction of the heat exchanger tubes, a casing defining the gas duct, the casing having a thermal insulating material provided inside of the casing so as to cover an outer periphery of the gas duct, the outer casing comprising a ceiling wall, a bottom wall, and side-walls, heat exchanger tube bundle panel support beams located outside the ceiling wall of the casing, the heat exchanger tube bundle panel support beams comprising ceiling walls of the casing when installed in the exhaust heat recovery boiler, header supports which penetrate the ceiling wall of the casing and connect the upper headers to the heat exchanger tube bundle panel support beams, the header supports being configured to support a plurality of heat exchanger tube bundle panels, vertical module frames comprising vertical support members of the heat exchanger tube bundle panels located outside the side-walls of the casing, the vertical support members comprising side walls of the casing when installed in the boiler, and horizontal module frames comprising horizontal support members of the heat exchanger tube bundle panel located outside the ceiling wall and bottom wall of the casing, the horizontal support members comprising ceiling walls and bottom walls of the casing when installed in the exhaust heat recovery boiler, the heat exchanger tube bundle panel module comprising at least one of a plurality of modules, the at least one of a plurality of modules having a size corresponding to parameters of the exhaust heat recovery boiler, wherein when transporting the heat exchanger tube bundle panel module, vibration restraining fixing members configured to prevent vibration of the heat exchange tubes are positioned between the vibration restraining supports and the casing, the heat exchanger tube bundle panel module having the vibration restraining fixing members positioned between the lower headers and the casing; providing main frames configured to support the heat exchanger tube bundle panel module, the main frames including main columns, main beams and bottom wall columns which are constructed at a construction site of the exhaust heat recovery boiler prior to installing the heat exchanger tube bundle panel module, inserting the at least one of a plurality of modules between an adjacent two main columns and setting a height of the heat exchanger tube panel support beams of the heat exchanger tube bundle panel modules to a setting, height of the main beams prior to installing the heat exchanger tube bundle panel module at the exhaust heat recovery boiler construction site, connecting and fixing the vertical module frames and the main columns to each other, connecting and fixing the horizontal module frame on the ceiling wall side and the main beam to each other, and connecting and fixing the horizontal module frame on the bottom wall side and the bottom wall columns to each other.