Abstract: Heat recovery for internal combustion engine, includes introducing a first fluid into heat exchanging element, and withdrawing the heated first fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with the heat exchanging elements to transfer heat through walls of the heat exchanging element from the second fluid to said first fluid.

Abstract: A heat exchanger for vaporizing a liquid where provided is a boiler in heat-transferrable contact with a plenum that receives a heated medium. The boiler receives a liquid through a liquid inlet, the liquid being in mist or droplet form. The boiler also receives a transport gas through a gas inlet. The transport gas serves to carry the liquid through the boiler where the liquid is vaporized. Also provided is a method of vaporizing a liquid where a transport gas is used to carry a liquid in mist or droplet form through a heated boiler for vaporization.

Abstract: A heat exchanger for vaporizing a liquid where provided is a boiler in heat-transferrable contact with a plenum that receives a heated medium. The boiler receives a liquid through a liquid inlet, the liquid being in mist or droplet form. The boiler also receives a transport gas through a gas inlet. The transport gas serves to carry the liquid through the boiler where the liquid is vaporized. Also provided is a method of vaporizing a liquid where a transport gas is used to carry a liquid in mist or droplet form through a heated boiler for vaporization.

Abstract: Heat recovery for internal combustion engine, includes introducing a first fluid into heat exchanging element, and withdrawing the heated first fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with the heat exchanging elements to transfer heat through walls of the heat exchanging element from the second fluid to said first fluid.

Abstract: Heat recovery for internal combustion engine, includes introducing a first fluid into heat exchanging element, and withdrawing the heated first fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with the heat exchanging elements to transfer heat through walls of the heat exchanging element from the second fluid to said first fluid.

Abstract: A method and an apparatus is provided for use in an underbalanced drilling process using exhaust gases wherein some constituents of the exhaust gas combine with water to form acids. The present invention provides a means of deacidifying drilling fluids. The pH of the drilling fluid is monitored and adjusted to prevent corrosion of equipment by acidic drilling fluids. The drilling fluid may also be optionally treated with anti-scaling agents. The drilling fluid may be a gas, a liquid or a combination of both or it may be gasified oil based drilling fluid.

Abstract: A method and apparatus is provided for use in underbalanced drilling of a well bore. A stream of substantially inert gases is provided by cooling, treating and compressing a stream of exhaust gases. The exhaust gases are cooled to a temperature less than 100.degree. F. in a quench tower and a heat exchanger. The cooled gases are treated to reduce their acid content and then compressed to a pressure suitable for underbalanced drilling. The compressed exhaust gases can then be used as the drilling fluids. They may or may not be mixed with atmospheric air or drilling mud.