Abstract: A once-through steam generator or boiler of simple modular construction that utilizes vertical heat transfer tubes, intended primarily for heat recovery in combined cycles. It utilizes a novel method of assembly and operation that make it particularly effective for large combined cycles. Circuit assemblies with a once-through flow path are the key building blocks used to assemble boilers to fit any size gas turbine. They are individually bench fabricated in a horizontal plane. The boiler is manufactured by sequentially stacking individual circuit assemblies in parallel thereby building a circuit module. During the stacking process the inlet and outlet of each circuit assembly are connected to headers to allow the modules to be erected into a heat transfer bundle. For large boilers several transportable circuit modules are interconnected in the field to complete a once-through boiler.

Abstract: Control systems (or controllers) for once through, unfired steam generators (or boilers) which control a single parameter--the feedwater flow to the boiler--in accord with an energy or enthalpy balance between the hot gases supplied to the boiler and the steam generated in it. These control systems have a predictive mode of feedwater control and, optionally, an operator selectable, feedback mode to compensate for drifts in the predictive mode. Other corrections may also be made, and predictive and corrective flow splits can be provided to obtain maximum efficiency when the control system is utilized to regulate the operation of a dual pressure boiler.

Abstract: A compact, unfired, staggered tube, once-through steam generator or boiler of simple construction intended primarily for combined cycle power plants in which the thermal energy utilized to generate steam is obtained from the exhaust gases of a gas turbine engine. The boiler provides steam at two different pressure levels, which maximizes recovery of thermal energy; and all wettable components in the steam/water loop are fabricated of corrosion resistant materials. This eliminates the need for controlling the pH of the feedwater and the need for chemically controlling its dissolved oxygen content, thereby reducing maintenance and operating costs and making automatic, unattended, remotely controlled operation of the boiler practical as well as eliminating the need for blowing down the boiler and minimizing requirements for make-up water. The boiler can be operated dry to remove gas side fouling; and feedwater flow rates can be directly controlled.

Abstract: A compact, unfired, staggered tube, once-through steam generator or boiler of simple construction intended primarily for combined cycle power plants in which the thermal energy utilized to generate steam is obtained from the exhaust gases of a gas turbine engine. The boiler provides steam at two different pressure levels, which maximizes recovery of thermal energy; and all wettable components in the steam/water loop are fabricated of corrosion resistant materials. This eliminates the need for controlling the pH of the feedwater and the need for chemically controlling its dissolved oxygen content, thereby reducing maintenance and operating costs and making automatic, unattended, remotely controlled operation of the boiler practical as well as eliminating the need for blowing down the boiler and minimizing requirements for make-up water. The boiler can be operated dry to remove gas side fouling; and feedwater flow rates can be directly controlled.

Abstract: An anesthesia mask for laboratory animals comprising a supply tube having a generally conical mask at one end into which the animal's snout is inserted. Pressurized anesthesia gas is delivered through the tube and is prevented from leaking into the ambient environment by means of a second tube which concentrically surrounds the supply tube and is annularly spaced therefrom so that the space can be evacuated by a vacuum source. A holding bar is slidable transversely into the mask to hook onto the animal's incisors.

Abstract: Methods of and apparatus for providing refrigeration, heating and air conditioning which use metallic hydrides for thermal energy storage and upgrading.

Abstract: Temperature measuring apparatus of the photometric type having a fiber optics device for conducting radiation to a signal producing detector. Provision is made for a purging fluid at the opposite end of the fiber optics device to keep foreign matter from accumulating.

Abstract: A burner for Rankine cycle engines which includes a combustor of the rotating atomizer type and a control system therefor which keeps the ratio of fuel and air supplied to the combustor at an optimum over a wide range of operation to maximize efficiency and minimize the emission of pollutants from the combustor.