Abstract: A heat exchanger, comprising at least a double shell, wherein the lower portion of the inner space of the inner shell is filled with liquid phase change medium, and at least one coiler is provided in the upper portion. The heated fluid flows in the coiler. After the downstream side pipe of the coiler is pierced through the inner shell, at least one surrounding pipe is formed in the cavity between the double shells. The bottom heat exchange plate of heat exchanger of the inner shell is located above the heat source. The cavity between the two shells forms the flue gas passage. After bottom heat exchange plate of the inner shell is heated by the heat source, the flue gas rises from the bottom of perimeter of the inner shell along the flue gas passage and the heat is transferred to the heated fluid in the surrounding pipe. The heat device using the heat exchanger according to the present invention can significantly improve the efficiency of heat utilization.

Abstract: Tubes within a radiant heating section of a coking furnace are arranged differently than in a single vertical column and connected together in a simple, planar serpentine pattern. The tubes are arranged in a plurality of offset or staggered vertical columns. This arrangement permits the upper tubes to be close to the radiant heat source and allows the tube bends connecting adjacent tubes to be of greater radius, so that the pressure at which the feedstock is passed through the tube bundle can be lower allowing more vaporization of the cracked process fluids.

Abstract: Apparatus and method for high efficiency transfer of heat from a combustion process to a working fluid wherein the combustion flame directly impinges upon a special material in contact with conduit means for directing the flow of the working fluid. The hottest part of the flame may be adjusted to directly contact such material. The apparatus in which such process takes place is subjected to a pressure gradient, directed from the top to the bottom of said apparatus such that the combustion gases are downwardly directed through the device for secondary heating of said working fluid prior to exhaust therefrom.

Abstract: An improved multi-section heat exchanger unit for use in combination with a radiant furnace unit or direct fired heaters which comprises a first heat exchange section having a plurality of bare heat exchange pipes positioned therein and in fluid communication with a first heat exchange fluid inlet and a first heat exchange fluid outlet to provide fluid flow through the bare pipes; and a second heat exchange section having a plurality of extended surface heat exchange tubes positioned therein in fluid communication with a second heat exchange fluid inlet being in fluid communication with the outlet of the first heat exchange section, the second heat exchange section being further characterized as having a gradually reduced internal cross section towards its upper portion so that the velocity of gas flow therethrough is maintained substantially constant.

Abstract: An air heater comprising a pipe assembly having an intake opening and an outlet opening which is horizontally supported by a stand and protected by a removable, open-topped sleeving. The pipe assembly is a series of internally interconnected pipes which provides a continuous air flow passageway from the intake opening to the outlet opening. The pipe assembly is heated by a small fire inside the sleeving while a pump forces cold air into the intake opening. As the pumped, cold air circulates through the heated pipe assembly, the air becomes heated, and hot air is expelled at the outlet opening.