Showing papers on "Gas heater published in 1988"

Start-up method for a direct reduction process without an external reformer

Abstract: Start-up method for an iron ore direct reduction process, where in the steady-state process the reducing gases are produced by steam reformation of natural gas catalyzed within the reducing zone of the reduction vessel by the reduced ore present therein. During established steady-state operation, a process gas stream is circulated in a reducing gas loop comprising the reduction vessel, a gas heater, and units to remove H 2 O and CO from the gas circulating in said loop. Natural gas and water are fed directly to the reducing gas loop as make-up reactants for the reformation. At plant start-up there is a complete absence of metallic iron to catalyze the reformation reaction at any temperature, and a complete absence of H 2 or CO so no effective reduction is possible to produce the needed metallic iron. In a multi-stage start-up, the reduction vessel is first charged with iron ore and pressurized by introducing natural gas to said loop. Simultaneously, the temperature is raised to the range of 400° to 600° C. The natural gas cracks, producing a small amount of H 2 and some carbon soot. Second, the temperature is further increased, and injection of water is begun to prevent further carbon deposition, to promote the production of H 2 , and to avoid H 2 consumption; until 3% to 8% by volume of H 2 accumulates. Third, at about 750°-820° C., water injection is interrupted favoring the accumulation of hydrogen until a concentration of about 65% is achieved while the temperature of the process gas stream reaches its steady-state value of about 950° C. Fourth, water is again injected to promote the reforming of make-up natural gas within the reduction vessel and all process feeds are adjusted to their steady-state values.

Control device for coal gasification combined cycle

Abstract: PURPOSE:To eliminate a conventional air flow regulating valve, by controlling an independent air compressor for compressing a part of compressed air obtained by a gas turbine and feeding same to a gasifying furnace, according to a change in load command to be applied to a gasifying furnace controller. CONSTITUTION:A crude gas formed in a gasifying furnace 4 is refined into a fuel gas by a gas cooler 5 and a desulfurizing device, and thereafter the fuel gas is supplied through a gas heater and a fuel pressure regulating valve 8 to a combustor 9 of a gas turbine equipment A. There is provided a gasifying furnace controller 29 for controlling a coal flow regulating valve 1 and a steam flow regulating valve 3 both attached to the gasifying furnace 4 according to a load command signal. Further, a part of a high pressure air obtained by a gas turbine 11 is compressed by an independent air compressor 14, and is supplied to the gasifying furnace 4. An opening signal obtained in the gasifying furnace controller 29 is applied to a controller 30 for controlling the air compressor 14 to thereby change the revolution of the air compressor 14 in accordance with a change in load command.

Portable gas heater with gas bottle container - which has trolley for IR radiator, usable for food serving

Abstract: The gas heater (10) has a housing (50,52,56,60), accommodating a gas bottle (48), and a support (16,30,20) for an IR heater (14). The housing forms a food serving device, partic. a trolley (12). There is pref. a flat top plate (56) extending horizontally and protruding beyond the housing and incorporating a handle (72). The heater support can be adjustable, and additional equipment for food preparation can be included (82,86). ADVANTAGE - Compact design for food serving.

Fluidizing bed system

Abstract: PURPOSE:To manufacture a powder producible as pellet, by adding a microwave heater as prestage process of a fluidizing bed for denitration of recovered uranium to convert the bed to that for roasting and reduction. CONSTITUTION:First, a solution to be treated of material is denitrated by heat with a microwave heater 2 and a solid obtained crushed with a mill 3 into pieces in a specified size. Then, the crushed product is stored into an intermediate storage tank 4 or supplied with a powder feeder 5 into a fluidizing bed 6. Air from an air supply source 7 for roasting is heated with an air heater 8 as required and supplied into the fluidizing bed 6 while the crushed product is supplied. After the crushed product is supplied by a specified value into the fluidizing bed 6, a reducing gas is supplied through a reducing gas heater 11 from a reducing gas supply source 10 to perform a reduction. A product after the end of the reducing reaction is stored in a storage tank 13 while an exhaust gas is supplied to a absorption column 14 to treat. This enables manufacture of a powder producible as pellet.

Rapid heating equipment for manufacturing semiconductor device

Abstract: PURPOSE:To improve the uniformity of the temperature distribution of a treating gas by mounting a gas heater on part of the way of a gas introducing pipe and preheating the treating gas introduced by the gas heater in response to a heat treatment temperature. CONSTITUTION:A gas heater 10 is set up and constituted on part of the way of a gas introducing pipe 7. A treating gas flow-controlled by a gas flow controller 9 is preheated in response to the heat treatment temperature of a semiconductor material 4 as an object to be thermally treated by the gas heater 10 in a process in which the treating gas is introduced into a chamber 2 from the gas introducing pipe 7. Accordingly, the uniformity of the temperature distribution of the treating gas to the semiconductor material in the chamber 2 is improved.

Exhaust gas desulfurizer

Abstract: PURPOSE:To prevent exhaust gas from drifting, and increase desulfurizing performance by providing a rectification plate in a duct, a drive control means to adjust the angle of the rectification plate and open and close the same, and a spray piping disposed integrally on the rectification plate. CONSTITUTION:After being heat exchanged by a gas heater 4, exhaust gas 1 containing sulfur oxide which is exhausted out of a boiler is led to a connecting duct 6. Said exhaust gas 1 is rectified by a rectification plate 16, and cooled and dust-removed by jetting spray solution 24 out of a spray piping provided on a shaft supporting the rectification plate 16. The cooled and dust- removed cooling gas 25 is led to a desulfurizing column 7, passes through a gas dispersion plate 8 evenly and is desulfurized in a dust-removing section 9 and a mist catching section 10. During said process, absorbing solution 12 used for the dust-removing section 9 is compressively transferred to a spray solution circulating piping 23 and is used as spray solution 24 from the spray piping. Also, in case exhaust gas volume is varied, by adjusting the angle of the rectification plate 16, cooled gas 25 is passed evenly through inside the desulfurizing column 17. In case water circulating operation is carried out, the rectification plate 16 is totally closed.

Gas heater for metallic for forming casting mold

Abstract: PURPOSE:To decrease the distortions of metallic molds and to economize on consumption of gases by providing many heating gas passages to the rear surface of the molding cavity of the metallic molds and disposing gas burners respectively to the apertures on one side of the passages. CONSTITUTION:The many heating gas passages 11 are provided to the rear surface of the molding cavity 18 formed of the metallic molds 10, 10' and the gas burners 12 are disposed to face the apertures 11' on one side. The apertures 11'' on the other side form waste gas discharge ports for combustion gases. The gas passages 11 are interconnected and disposed in the metallic molds 10, 10'. The sure gas discharge in the gas passages 11 is attained by the above- mentioned method and since the heating efficiency of the gases is improved, the consumption of the gas is economized. The distortions of the metallic molds 10, 10' are decreased as the heating of the molds 10, 10' is executed from the inside thereof.

Exhaust gas denitrating and desulfurizing method

Abstract: PURPOSE:To control the corrosion of a gas heater by forecasting SO3 concentration at an inlet of a gas heater, regulating the increase and decrease of dust collecting capability of an electrostatic precipitator in accordance with the increase and decrease of said SO3 concentration and also regulating the volume of SO3 removing agent. CONSTITUTION:SO2 concentration in exhaust gas out of a coal-fired boiler is continuously measured, and said SO2 concentration is multiplied by the total of SO2 product ratio of the boiler preliminarily measured and SO3 product ratio of a denitration device, SO3 passage ratio in an air preheater and SO3 passage ratio in an electrostatic precipitator. By said process, SO3 concentration in an inlet of a gas gas heater (GGH) is forecast, and the dust collection capability of the electrostatic precipitator is increased or decreased in accordance with the increase or decrease of said SO3 concentration, and/or SO3 removing agent supplied to the GGH inlet is increased or decreased. By said process, SO3 concentration in the exhaust gas introduced in GGH can be controlled to a given value or less.

Far-infrared gas heater - Its concept and application

Abstract: Far-infrared heating is a radiant heating system which has come to be highlighted based on the fact that high molecular substances have higher absorptivity. Radiant heating was considered effective for heating in high temperature ranges while the far-infrared heating can be said to be a type of radiant heating applicable to lower temperature heating such as drying paint and heating food. In 1982, Osaka Gas initiated the development of far-infrared gas heater, which was followed by research and development of combustion technology, heating technology, and control technology, and all these efforts successfully resulted in practical use in 1984 and subsequent marketing of the far-infrared gas heaters. The far-infrared gas heater was developed through experiments and researches on characteristics of the spectral radiant energy of far-infrared radiant substances and effects of far-infrared heating. As of November in 1987, heating installations which incorporate this type of heaters have amounted to 47 units. As compared with a conventional hot air heating system used for paint heating for example, the far-infrared heating system has accomplished considerable reduction in heating time and subsequently let to 30% of energy saving and 50% of space saving.

Manufacture of complex metal wire

Abstract: PURPOSE:To improve the fitting capability and the strength of products by heating nonoxidizing atmosphere through which a preheated core stock passes to a high temp. and keeping the temp. of the core stock higher than a specific temp. until the inlet of an extruder. CONSTITUTION:A core stock heater 5 is provided on a core stock 1 and a tube 7 through which gaseous argon flows and a gas heater 6 are also installed. The core stock 1 preheated by the heater 5 passes through the nonoxidizing atmosphere in the tube 7 through which the argon gaseous heated by the gas heater 6 flows, enters an extruder 8, is combined integrally with Al wire being to be a cover stock 9, and is extruded as a Al-clad metal wire 10. In that time, the temp. of the core stock 1 is kept >=300 deg.C until the inlet of the extruder 8. In this method, difused fitting between the stocks 1 and 9 is sufficiently performed, so that the fitting capability and the strength of products are improved.