Multi-tube once-through boiler

Abstract

In a multi-tube once-through boiler configured such that boiler water within water tubes is heated and evaporated to take out consumed steam, rows of water tubes arranged on the left and right of the combustion chamber are respectively connected by linear left and right upper headers provided at upper ends and linear left and right lower headers provided at lower ends, a lid body is formed on one end side facing the combustion chamber and a burner for supplying combustion gas to the combustion chamber is provided, and the burner is provided with a recovered oil supply unit for supplying recovered oil, a waste solvent supply unit for supplying a waste solvent, an injected air supply unit, a combustion air supply unit, and a control unit for controlling the supply of the recovered oil, the waste solvent, the injected air, and the combustion air.

1 . A multi-tube once-through boiler configured such that both end sides of each of a plurality of water tubes communicate with each other and boiler water is supplied to each water tube, while a combustion chamber is formed inside each water tube, combustion gas from the combustion chamber is supplied outside the plurality of water tubes to heat and evaporate the boiler water within the water tubes, and consumed steam is taken out, wherein
 the combustion chamber has a horizontally extending cylindrical shape,   each water tube has an arc shape arranged on left and right sides of the combustion chamber,   a row of water tubes arranged on the left side of the combustion chamber are connected by a linear left upper header provided at an upper end and a linear left lower header provided at a lower end,   a row of water tubes arranged on the right side of the combustion chamber are connected by a linear right upper header provided at an upper end and a linear right lower header provided at a lower end,   a door is formed on one end side facing the combustion chamber and a burner installed on an outer surface of the door and supplying combustion gas to the combustion chamber is provided,   the burner is provided with a recovered oil supply unit for supplying recovered oil including at least used engine oil, a waste solvent supply unit for supplying by-product oil as a waste solvent,   an injected air supply unit for supplying injected air for spraying the recovered oil and the waste solvent in the burner at appropriate pressures each adjusted through a pressure control unit,   a combustion air supply unit for supplying combustion air for burning the recovered oil and the waste solvent in the burner, and   a control unit for controlling supply of the recovered oil, the waste solvent, the injected air, and the combustion air, and   both the recovered oil and the waste solvent are used for fuel to operate.   
     
     
         2 . The multi-tube once-through boiler according to  claim 1  wherein the rows of water tubes are each composed of an inner water tube row and an outer water tube row, and each water tube of the outer water tube rows is arranged between water tubes of the inner water tube rows. 
     
     
         3 . The multi-tube once-through boiler according to  claim 1 , wherein an openable and closable hole portion is formed in each front surface on the door side of the left upper header and the right upper header and each front surface on the door side of the left lower header and the right lower header. 
     
     
         4 . The multi-tube once-through boiler according to  claim 2 , wherein a group of rows of water tubes composed of the inner water tube rows and the outer water tube rows is arranged so that the door side is located at a lower position than the innermost side of the combustion chamber. 
     
     
         5 . The multi-tube once-through boiler according to  claim 1 , wherein the by-product oil is gutter oil. 
     
     
         6 . The multi-tube once-through boiler according to  claim 1 , wherein the by-product oil is waste ink.