Abstract

The present invention provides an economizer with which it is possible to efficiently warm water, the economizer having a structure that facilitates inspection and cleaning.　An economizer for warming water through use of combustion exhaust gas generated by a boiler, wherein: to a cylindrical water pipe (11) through which the water passes and in which an inflow port (12) and an outflow port (13) are formed in a side surface thereof, a plurality of gas pipes (61, 62, 63) erected in order to circulate the combustion exhaust gas are each provided in fan-shaped portions of the water pipe (11); and combustion exhaust gas introduced from the water pipe bottom surface side turns back and flows downward in the water pipe upper part, and then turns back in a water pipe lower part and flows upward, and is discharged from the water pipe upper surface side, whereby the plurality of gas pipes efficiently warm the water in the water pipe (11).

IPC Classes  ?

• F22D 1/24 - Feed-water heaters, e.g. preheaters with fire tubes or flue ways traversing feed-water vessels

Abstract

The present invention provides a multi-tube once-through boiler in which it is possible to use a recovered oil and a waste solvent as a combustion gas for generating consumption steam, and in which there is obtained a structure that makes it possible to easily clean water pipes. A multi-tube once-through boiler configured so that boiler water within water pipes is heated/evaporated and consumption steam is produced, wherein: a combustion chamber (9) is formed in a cylindrical shape extending in a horizontal direction; the water pipes are formed in an arcuate shape disposed on the left and right sides of the combustion chamber (9); the multi-tube once-through boiler comprises a burner (10) that is connected to the rows of water pipes arranged on the left and right sides of the combustion chamber (9) by each of left/right linear upper headers (1) provided to the upper end and left/right linear lower headers (2) provided to the lower end, and that forms a lid body (door) (22) on one end facing the combustion chamber (9) and supplies a combustion gas to the combustion chamber (9); and the multi-tube once-through boiler also comprises a recovered oil supply unit that supplies recovered oil to the burner (10), a waste solvent supply unit that supplies a waste solvent to the burner (10), an injected air supply unit, a combustion air supply unit, and a control unit that controls the supply of the recovered oil, the waste solvent, the injected air, and the combustion air.

IPC Classes  ?

• F22B 21/30 - Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes of form other than straight or substantially straight bent in U-loop form