Boiler

Abstract

An amount of scale adhering onto inner surfaces of water tubes in any one of various boilers including a steam boiler, a hot water boiler, a waste heat boiler, and an exhaust gas boiler is accurately known by providing a temperature sensor at an appropriate position of the boiler. A plurality of water tubes ( 5, 6 ) connecting between an upper header ( 3 ) and a lower header ( 4 ) constitute an inner water tube row ( 7 ) and an outer water tube row ( 8 ). Inner longitudinal fins ( 9 ) close gaps between the adjacent inner water tubes ( 5, 5 ) except at a lower end of the inner water tube row ( 7 ). Outer longitudinal fins ( 11 ) close gaps between the adjacent outer water tubes ( 6, 6 ) except at an upper end of the outer water tube row ( 8 ). A plurality of upper outer lateral fins ( 17 ) are provided in a vertical direction on a surface constituting an inner peripheral surface of the outer water tube row ( 8 ) in a predetermined region extending upward from an intermediate portion in the vertical direction of each of the outer water tubes ( 6 ). A temperature sensor ( 29 ) is provided to one of the outer water tubes ( 6 ) at a position corresponding to a lower end of the predetermined region. An adhesion state of the scale is known based on a temperature detected by the temperature sensor ( 29 ).

1 . A boiler, comprising:
 a plurality of water tubes connecting between an upper header and a lower header; and   a temperature sensor provided to one of a water-boiling start portion and a high-heat load portion of at least one of the plurality of water tubes.   
     
     
         2 . A boiler according to  claim 1 , wherein:
 the plurality of water tubes are arranged to form a concentric cylindrical shape to constitute an inner water tube row and an outer water tube row;   an inside of the inner water tube row serves as one of a combustion chamber and a space into which an exhaust gas is introduced;   a gas flow path is defined so as to deliver one of a combustion gas and the exhaust gas from the inside of the inner water tube row to an outside of the outer water tube row through between the inner water tube row and the outer water tube row;   at least one of the inner water tube row and the outer water tube row is provided with lateral fins only in a region extending from an intermediate portion of the gas flow path to a downstream portion thereof, or the lateral fins located in the region extending from the intermediate portion of the gas flow path to the downstream portion thereof are provided to have an extending length extending from the plurality of water tubes larger than a length of a lateral fin located upstream of the intermediate portion of the gas flow path; and   in the gas flow path, the temperature sensor is provided to the at least one of the plurality of water tubes at one of a position, at which one of the lateral fins located endmost among the lateral fins is provided, and a position, at which the extending length of the lateral fins is larger than the length of the lateral fin located upstream of the intermediate portion of the gas flow path.   
     
     
         3 . A boiler according to  claim 2 , wherein, of part of the plurality of water tubes constituting the outer water tube row, one of the part of the plurality of water tubes having a large heat-receiving amount is provided with the temperature sensor. 
     
     
         4 . A boiler, comprising:
 a plurality of inner water tubes arranged to form a cylindrical shape between an upper header and a lower header to constitute an inner water tube row;   a plurality of outer water tubes arranged to form a cylindrical shape between the upper header and the lower header so as to surround the inner water tube row to constitute an outer water tube row;   a plurality of inner longitudinal fins provided to close gaps between the adjacent plurality of inner water tubes except at a lower end of the inner water tube row;   a plurality of outer longitudinal fins provided to close gaps between the adjacent plurality of outer water tubes except at an upper end of the outer water tube row;   outer lateral fins provided on a surface constituting an inner peripheral surface of the outer water tube row in a predetermined region extending upward from an intermediate portion in a vertical direction of each of the plurality of outer water tubes; and   a temperature sensor provided to one of a group including one of the plurality of outer water tubes, one of the plurality of outer longitudinal fins, and one of the outer lateral fins at a position corresponding to a lower end of the predetermined region.   
     
     
         5 . A boiler, comprising:
 a plurality of inner water tubes arranged to form a cylindrical shape between an upper header and a lower header to constitute an inner water tube row;   a plurality of outer water tubes arranged to form a cylindrical shape between the upper header and the lower header so as to surround the inner water tube row to constitute an outer water tube row;   a plurality of inner longitudinal fins provided to close gaps between the adjacent plurality of inner water tubes except in one portion in a peripheral direction of the inner water tube row;   a plurality of outer longitudinal fins provided to close gaps between the adjacent plurality of outer water tubes except in another portion in the peripheral direction of the outer water tube row;   outer lateral fins provided on a surface constituting an inner peripheral surface of the outer water tube row in a predetermined region extending from an intermediate portion in the peripheral direction to the another portion in the peripheral direction of the outer water tube row; and   a temperature sensor provided to one of a group including one of the plurality of outer water tubes, one of the plurality of outer longitudinal fins, and one of the outer lateral fins at a position corresponding to a side of one portion in the peripheral direction of the outer water tube row in the predetermined region.   
     
     
         6 . A boiler according to  claim 5 , wherein the temperature sensor is provided at a height corresponding to a height of a water-boiling start portion in one of the plurality of outer water tubes provided with the temperature sensor.