Improvements relating to direct-contact boiler feedwater heaters

摘要

481,438. Heating feedwater. SAMUEL, H. A. Sept. 7, 1936, No. 24353. [Class 64 (i)] Feedwater is heated by direct contact with superheated steam in a chamber C containing a perforated conical baffle C1 having internal and external helical ribs. Water flows into the chamber from a supply pipe A through concentric passages B6, B11 having their walls perforated for the admission of steam from the steam pipe B7. The heated water flows into a degassing chamber D and then through a non-return valve D4 into a pipe A3 connected to the boiler. Air and gases escape through an outlet D3 and excess pressure is relieved by a valve D2. When the heater is cut out by closing the inlet valve A1 and the non-return valve D4, water flow direct to the pipe A3 through a byepass A5.