Showing papers on "Gas heater published in 1994"

Chemical vapor deposition method and apparatus therefore

Abstract: Fixed amounts of a liquid source for a chemical vapor deposition process is supplied continuously from a source tank and through a liquid mass flow controller to a three-way valve. Inside the three-way valve, the liquid source is evaporated to generate a source gas by contacting a high-temperature carrier gas which flows therethrough and becomes mixed with the source gas. The gas mixture thus generated is supplied into a process chamber for a chemical vapor deposition process. The carrier gas may be heated by a gas heater before entering the three-way valve. Alternatively, the three-way valve may be enclosed inside a thermostatic container, the carrier gas being heated inside the container.

Thermostatically controlled gas heater

Abstract: A thermostatic gas heater which permits the user to mechanically select the number of active heating elements, ranging from one to the total number of heating elements. The thermostat mechanically regulates gas flow to all active heating elements. No electricity is necessary for operation because all control components operate mechanically.

Method and apparatus for spraying molten materials

Abstract: A metal spray apparatus is provided with a supersonic nozzle. Molten metal is injected into a gas stream flowing through the nozzle under pressure. By varying the pressure of the injected metal, the droplet can be made in various selected sizes with each selected size having a high degree of size uniformity. A unique one piece graphite heater provides easily controlled uniformity of temperature in the nozzle and an attached tundish which holds the pressurized molten metal. A unique U-shaped gas heater provides extremely hot inlet gas temperatures to the nozzle. A particularly useful application of the spray apparatus is coating of threads of a fastener with a shape memory alloy. This permits a fastener to be easily inserted and removed but provides for a secure locking of the fastener in high temperature environments.

Metal spray apparatus with a U-shaped electric inlet gas heater and a one-piece electric heater surrounding a nozzle

Abstract: An electrically heated metal spray apparatus is provided with a supersonic nozzle. Molten metal is injected into a gas stream flowing through the nozzle under pressure. By varying the pressure of the injected metal, the droplet can be made in various selected sizes with each selected size having a high degree of size uniformity. A unique one piece graphite heater provides easily controlled uniformity of temperature in the nozzle and an attached tundish which holds the pressurized molten metal. A unique U-shaped gas heater provides extremely hot inlet gas temperatures to the nozzle. A particularly useful application of the spray apparatus is coating of threads of a fastener with a shape memory alloy. This permits a fastener to be easily inserted and removed but provides for a secure locking of the fastener in high temperature environments.

Gas heater with burner and heat exchanger - includes additional burner ribs located outside basic body of heat exchanger spaced form heat exchanger ribs and located in burner zone

Abstract: The heat exchanger (5) has a water channel inside, and heat exchanger ribs (12) outside its main body, and these ribs are in the burner gas stream. The burner (1) has additional ribs (15) arranged outside on the basic body of the heat exchanger next to the heat exchanger ribs and on the same side. The burner ribs are at a distance from the heat exchanger ribs (12) and are located in the burner zone (4) for the flames. The water channel is adjacent to the burner ribs or the burner zone. The basic body of the heat exchanger with the heat exchanger and burner ribs is all cast in a one piece element. ADVANTAGE - The heater has a much simpler form.

Air conditioner having supplemental gas heater for outdoor coil

Abstract: An air conditioner includes a compressor, an indoor heat exchanger, an expansion tube, and an outdoor heat exchanger interconnected by refrigerant conduits for operation in cooling and heating modes. In a cooling mode, the outdoor heat exchanger conducts ambient air horizontally across heat exchange coils. In a heating mode, the outdoor heat exchanger conducts heated air from an auxiliary gas-fired heater upwardly across those same coils. The outdoor heat exchanger includes movable blades for creating the horizontal and vertical air flow passages for the cooling and heating modes.

Flue gas treating device and controller for same

Abstract: PURPOSE:To provide a flue gas treating system which is stably operated without taking expensive countermeasures against equipment corrosion and where the concentration of smoke dust is reduced CONSTITUTION:In a flue gas treating system constituted of a heat reclaimer 1 for recovering heat of waste gas from a boiler, a dust collector 2 for removing smoke dust in the waste gas, a flue gas desulfurizer for removing acidic gas components in the waste gas and a reheater 7 for reheating treated gas by using the recovered heat from the heat reclaimer 1 before discharging it to the atmosphere, a steam type gas heater 5 is installed upstream of the reheater 7 And by controlling the heat exchange quantity in the steam type gas heater 5, that is, the feed steam quantity, the outlet gas temperature of the heat reclaimer 1 is always kept at a set value or more, preventing the equipment corrosion after the heat reclaimer 1

Production of formed coke

Abstract: PURPOSE:To efficiently obtain formed coke by heating part of the coke oven gas produced in a dry distillation oven with a continuous heat exchanger and returning the gas to the oven and by using the combustion exhaust gas generated as heat source for adjusting moisture content of coal to effect energy saving. CONSTITUTION:A dryer 2 is fed with coal 1 which is, in turn, fed with the combustion exhaust gas 14 at 250-300 deg.C generated from a continuous heat exchanger 10 to adjust moisture content of the coal 1, and the exhaust gas 27 passed through the dryer 2 is freed from dust using a dust remover 26 and the resultant exhaust gas 28 is released via a stack 13 into the air. The moisture-adjusted coal is then regulated in granular size with a grinder 3, being kneaded with a binder 20 and hot water 21 using a kneader 4 and made into formed coal 12 with a molding machine 5. Subsequently, the formed coal 12 is loaded in a dry distillation oven 6, being heated directly with hot air 24, 25 to conduct dry distillation to produce formed coke 7 which is then discharged via the oven bottom out of the oven. For the hot air 24, 25 for dry distillation, part of the coke oven gas 16 generated in the dry distillation oven 6 is heated with a high-temperature gas heater 11 and further heated with the continuous heat exchanger 10 and then returned to the dry distillation oven 6.

Direct ignition device for gas heater

Abstract: PURPOSE:To prevent soup from being over-boiled and spilled over to an ignition plug and unify the shape of combustion flames and the temperature distribution. CONSTITUTION:The top and the front of an ignition plug are covered with a cover board 10 whose tip is curled. A part of gas ejected from a burner port 2 is engulfed into the tip side 11 and ignited therein. Since the ignition plug 5 is covered with the cover board 10, a spilled-over article is hardly built up on the plug and the gas ejected from the burner port is partially engulfed and ignited there. This construction makes it possible to unify the shape of combustion flames and the temperature distribution as it provides an exclusive designed burner port, thereby preventing the generation of unequal portions.

Electron beam-irradiated exaust gas treatment and device therefor

Abstract: PURPOSE: To obtain a high desulfurization rate even when the temp. of the waste gas at the outlet of a reactor is relatively high by uniformly mixing gaseous ammonia with air, mixing the mixture with water homogeneously and spraying the admixture into the reactor. CONSTITUTION: A waste gas contg. SO x and NO x generated from a boiler 1 is cooled by an air preheater 2 and a gas heater 3, further cooled in a water- spray cooling tower 4 and introduced into a reactor 5. Meanwhile, the ammonia from an ammonia feeder 6 is mixed with air in a line mixer 7, and the mixture and water are mixed in the gas-liq. mixing chamber of a two-fluid nozzle 8 and sprayed into the reactor 5 from its inlet, and the admixture is irradiated with an electron beam from an electron accelerator 9. Consequently, a high desulfurization rate is obtained even when the temp. of the waste gas is relatively high at the reactor 5 outlet, and the concn. of ammonium sulfamate in the by-product is lowered. COPYRIGHT: (C)1996,JPO

Special Gas Heater for the TESLA Test Facility

Abstract: A special heater has been designed and is under construction at Fermi National Accelerator Laboratory for use at the TESLA test facility at the Deutches Electronen Synchrotron (DESY). This heater is used to warm up the 2.2 K helium gas coming from a dewar which is being pumped down to a pressure of 1600 Pa in order to keep the liquid in the test dewar in the superfluid state. This heater must warm the gas from 2.2 K to 300 K and must have a sufficiently low flow restriction that the pressure drop is less than 100 Pa across the unit with a flow of 10 grams/second. The heating element is constructed of 304 SS tubes with diameter .0127 m and wall thickness 0.254 mm. Each tube is 1 meter long and there are 648 tubes arranged in a square bundle. The tubes are heliarc welded to 3.176 mm thick stainless bars which make the electrical connections to the tubes. The gas is heated primarily inside the tubes with electrical current. The tubes are in a series parallel electrical arrangement which requires a power supply current of 500 amperes. A test has been performed which determines the performance of a single tube for a family of values flow and heating which bring helium gas from 77 K to 300 K. The results of the test will be compared with a computer simulation of the performance of a single tube.

Liquid or gas heater - has surface of tubular heater body bearing against casing via components allowing for different coefficients of expansion

Abstract: One or more heater bodies (12), parallel to the lengthwise axis of the casing (19) containing the medium to be heated, are joined to it. Each tube (12a) is made of material having a greater coefficient of expansion than that of the casing wall (10a). Each body bears against the casing wall via a surface (12e) containing components (14) allowing for the difference between the coefficients of expansion, typically formed by grooves cut in the surface. These can run diagonally in an intersecting pattern. They can form expansion joints at right angles to the tube axis. The tubes can be soldered to the casing, or alternatively flat sheet-metal components of good heat conductivity can be used, such as aluminium, passing round the tube and casing. USE/ADVANTAGE - Compact liquid or gas heater which gives high heat output.

Method for removing dust from extracted gas in formed coke oven

Abstract: PURPOSE:To remove dust from an exhaust gas in a vertical continuous type formed coke oven. CONSTITUTION:A method for removing dust from an exhaust gas by extracting a cooling gas in the oven from an extraction tuyere disposed at the upper part of a cooling chamber 2 under a formed coke oven 1, mixing the extracted gas with a coke oven gas heated in a gas heater 13 in an ejector 14, and subsequently supplying the gas mixture from a low temperature tuyere 17 disposed at the upper part of the oven into the oven is characterized by removing coke dust in the extracted gas with a dust-removing device 18 disposed in an extraction tuyere branch pipe connected to the low temperature tuyere at the upper part of the oven.

Regeneration of gas for laser in carbon dioxide gas laser apparatus

Abstract: PURPOSE:To provide an industrially practical technique in a carbon dioxide gas laser apparatus using a gas regenerator CONSTITUTION:A gas flow path of a gas regenerator B in which a gas heater 5 and a catalyst bed 6 for gas regeneration are installed is connected to a gas circulating path of a laser generator A through a coupling A catalyst is activated by circulating an activation gas or the gas caused by an activation is purged by a mixed gas for laser Also, the gas regenerator B may have a gas circulating path in which a gas circulating fan and an adsorbent floor are installed