Showing papers on "Thermal efficiency published in 1969"

Laboratory Study of a Combination of Forward Combustion and Waterflooding The COFCAW Process

Abstract: A combination of forward combustion and waterflooding (COFCAW) can result in a markedly improved oil recovery method. Combustion maintains a zone of elevated temperature. Some of the injected water serves to fill up the burned-out region. The remainder of the water picks up heat that is otherwise wasted during conventional forward combustion, is converted to steam, and transports the heat ahead. The steam plateau, a zone of nearly constant temperature due to the condensation of steam, is much larger than that which occurs during forward combustion. This causes the oil to be displaced more efficiently and results in reduced fuel consumption and reduced air requirements. Eleven laboratory COFCAW experiments are reported. The COFCAW process holds promise as an economic tertiary recovery method for selected reservoirs. (11 refs.)

Sulfur mining with steam

Abstract: This is an improvement and modification of the Frasch-type underground sulfur-mining process. The primary source of heat is steam with temperature up to 600*-800* F. which is injected into the sulfur deposit. Hot water at a temperature above 240* but not over 320* F. is injected below the steam. The steam zone is surrounded by an advancing zone of hot condensate within which melting of the sulfur occurs in a temperature range of 240*-320* F. The molten sulfur flows by gravity towards the central production tubing intake and is insulated from the hot injected steam by a blanket of hot water. Reduced water requirement per ton of sulfur and higher thermal efficiency are effected by this process.

A study of thermal transpiration for the development of a new type of gas pump.

Abstract: Thermal transpiration, the phenomenon of the flow of gases through porous media under the influence of a temperature gradient, can be utilized as a driving force in a new type of gas pump. A parametric study for determining conditions for the optimum performance of such a pump requires, in addition to the thermal transpiration measurements, appropriate independent measurements for determining the geometric properties of the porous media. Experiments were carried out on five porous ceramics and two Millipore fillers of different geometric properties. It was found that a maximum reduced efficiency of about 1 percent can be achieved with a thermal pump under optimum conditions. Equations based on the methods of nonequilibrium thermodynamics and the dusty-gas theory satisfactorily explain the experimental results and thus allow the prediction of pump performance for given conditions.

Gas turbine engine heat exchanger and combustion system

Abstract: FUEL INJECTED INTO THE COMPRESSED AIR UPSTREAM OF THE HEAT EXCHANGER VAPORIZES AND MIXES WITH THE AIR DURING PASSAGE THROUGH THE HEAT EXCHANGER. THE FUEL-AIR MIXTURE IS IGNITED AS IT EMERGES FROM THE HEAT EXCHANGER AND BURNS WITHIN A SHORT DISTANCE FROM THE EXIT SURFACE OF THE HEAT EXCHANGER. FUEL IS INJECTED THROUGH NOZZLES UPSTREAM OF THE COMPRESSOR OR A SLINGER SYSTEM ASSOCIATED WITH THE ROTATING COMPRESSOR.

Analytical investigation of the effect of cooling air on two-stage turbine performance

Abstract: Flow analysis to determine turbine efficiency as function of inlet temperature for two stage turbine

The Potential Danger of Fire in Gas Turbine Heat Exchangers

Abstract: Increased emphasis is being placed on the regenerative gas turbine cycle, and the utilization of waste heat recovery systems, for improved thermal efficiency For such systems there are modes of engine operation, where it is possible for a metal fire to occur in the exhaust heat exchanger This paper is intended as an introduction to the subject, more from an engineering, than metallurgical standpoint, and includes a description of a series of simple tests to acquire an understanding of the problem for a particular application Some engine operational procedures, and design features, aimed at minimizing the costly and dangerous occurrence of gas turbine heat exchanger fires, are briefly mentionedCopyright © 1969 by ASME

An Experimental Study on the Performance of a Multifuel Engine : Part 3,An Attempt of M-Combusion Applied to a Swirl Chamber

Abstract: By the adoption of M-combustion process proposed by J S Meurer, the low rate of pressure rise and smoother running will be assured, because combusion takes place after gradual evaporation of the fuel from the combusion chamber wall Also, the combusion behaviour of this process is almost the same as the prograssive combusion of pre-mixed mixture, so the combusion completes quickly and better thermal efficiency will be assured This paper covers an experiment with regard to the attempt of M-combustion applied to a swirl chamber, to improve the multifuel capability of diesel engine And the effects on the combustibility of the wall temperature, dimensions of the fuel injection system, and engine operating conditions were discussed, and engine performances on gas oil and gasoline were compared As the result, smoother combustion was assured by the adoption of M-combustion on swirl chamber, and if gasoline was used as fuel, exhaust smoke was reduced over a wide load renge If this process was applied to direct injection engine such as M A N, there will exist a weak point concerning the formation of the combustion air swirl, but if a swirl chamber is used, this problem will be solved perfectly

The Wankel Rotary Piston Engine

Abstract: The Wankel is the first of many rotary piston designs to have challenged the dominance of the reciprocating piston engine for small power units. Compared with the reciprocating internal-combustion engine, it offers reduced size, weight, vibration, noise and production costs, combined with comparable thermal efficiency. Commercial production was started by N.S.U. Motorenwerke in Germany and Toyo Kogyo in Japan in 1967 as a petrol engine for cars; a joint N.S.U.-Citroen car will follow later. The engine is also suitable for industrial, marine or aeronautical uses, and there is much interest in possible diesel and multi-fuel versions. Sixteen European, American and Japanese companies held licences to build the engine by January 1968.

Thermal efficiency of crosscurrent design in multizone fluidized-bed furnaces

Abstract: It is shown that crosscurrent design is an efficient way of organizing heat exchange in the preheating and cooling zones of multizone fluidized-bed furnaces.