Tube and shell heat exchanger

Claim 1

A heat exchanger comprising a first vertically disposed cylindrical pressure vessel defining a chamber and having an upper opening, a vertically elongated cylindrical liner extending downwardly through said upper opening into said pressure vessel, a second pressure vessel disposed above said first pressure vessel and having a lower opening, said liner having its upper portion extending through said lower opening, a first channel head and tube sheet structure connected to the upper portion of said second pressure vessel, a second channel head and tube sheet structure disposed adjacent the lower end of said liner, a plurality of heat exchange tubes connected to said upper and lower tube sheets in fluid communication with said upper and lower channel heads, a tubular flow guide disposed in encompassing relation with said liner, a first inlet nozzle disposed in said second pressure vessel for admitting a primary fluid into said second pressure vessel and into good heat exchange relation with said tubes, means for directing said primary heated fluid into said flow guide, said flow guide being closed at its bottom end and having at least one outlet in its upper portion communicating with said chamber, a first outlet nozzle disposed in said first pressure vessel for removing said primary fluid from said chamber, a second inlet nozzle disposed in fluid communication with said lower channel head for admitting a secondary fluid into said lower channel head, and a second outlet nozzle disposed in fluid communication with said upper channel head, for removing said secondary fluid from said upper channel head.