Showing papers on "Gas heater published in 2002"

Deposition efficiency, mechanical properties and coating roughness in cold-sprayed titanium

Abstract: In the cold-spray process, metal powder particles develop into a coating as a result of ballistic impingment on a substrate. In cold-spray, compressed gas (air, nitrogen or helium), at pressures ranging between 1.4– 3.4 MPa (200–500 psi), but typically around 1.7 MPa (250 psi), flows through a manifold system containing a gas heater and a powder feeder. The pressurized gas is heated electrically to around 100–600 ◦C then passed through a Laval-type converging/diverging nozzle until the gas velocities reach supersonic speeds. The powder particles are introduced into the gas stream just in front of the converging section of the nozzle and are accelerated by the expanding gas. The powder feedstock is delivered on the high-pressure side of the nozzle by the metering device, which is heated and maintained at the elevated pressure of the manifold. During the supersonic expansion through the Laval nozzle, there is a temperature reduction. Thus, the temperature of the gas stream is always below the melting point of the particulate material, providing coatings developed primarily from particles in the solid state with very little oxidation [1–5]. As cold-spray is a 100% solid-state process, the deposition “in air” of titanium coatings without significant oxidation represent an important technical achievement. Titanium and its alloys are employed in corrosive environments, aerospace and bio-implants [6]. Beyond the solid-state characteristic, a fundamental feature of the cold-spray method is the concept of critical velocity (V ∗). For each coating and substrate combination there is a V ∗. Above the V ∗ the particles will have enough kinetic energy to be incorporated into a coating. Below the V ∗, the particles will be either reflected from the surface (bounced-off) or cause erosion of the substrate and any coating buildup which had begun. For particle velocities V > V ∗, the coating process occurs and the deposition efficiency is seen to increase with increasing V [1, 4, 5]. The actual mechanisms by which the solid-state particles deform and bond has not been well characterized. It seems plausible, though it has not yet been demonstrated, that plastic deformation may disrupt thin surface films, such as oxides, and provide intimate conformal contact under high local pressure, thus per-

Sulfur control in ion-conducting membrane systems

Abstract: A method for controlling the sulfur dioxide partial pressure in a pressurized, heated, oxygen-containing gas mixture which is contacted with an ion-conducting metallic oxide membrane which permeates oxygen ions. The sulfur dioxide partial pressure in the oxygen-depleted non-permeate gas from the membrane module is maintained below a critical sulfur dioxide partial pressure, pSO2*, to protect the membrane material from reacting with sulfur dioxide and reducing the oxygen flux of the membrane. Each ion-conducting metallic oxide material has a characteristic critical sulfur dioxide partial pressure which is useful in determining the required level of sulfur removal from the feed gas and/or from the fuel gas used in a direct-fired feed gas heater.

Direct-fired heater

Abstract: A combustion system for a portable forced air heater having two frusta-conical sections attached to a circular burner tube, wherein each frusta-conical section has pre-determined vent hole patterns that allow the gas heater to have a variable burn rate.

Heat exchanger for a gas fired heater, especially a condensing boiler

Abstract: The heat exchanger for a gas heater, especially a calorific value heater, has a sleeve-shaped body with an inner wall and an outer mantle forming a channel for the flow of liquid to be heated. The inner wall, of a sand molded metal casting, is in contact with the exhaust gases and the liquid. The mantle (20) is a separated component from the inner wall (10), with ring seals (27,28) at the end sides between the mantle and the inner wall to give a watertight sealing. The inner wall has ribs (12,14,16) to increase the heating surface, and the mantle has spacer bars (11) to form flow channels.

Heat exchanger for a gas heater, esp. for a condensing boiler

Abstract: The heat exchanger has a tube coil through which fluid to be heated flows. The heater exhaust gas can be supplied to the tube coil cavity and between the windings to yield heat to the tube coil. The tube coil (10) consists of several part coils (10a, 10i, 10z) which are arranged in series for the fluid to be heated to pass through them.

Reducing organic and inorganic pollutants in exhaust gases and waste air comprises feeding exhaust gas stream onto adsorber/catalyst, separating exhaust gas stream from adsorber and connecting to circulating system

Abstract: Reducing organic and inorganic pollutants in exhaust gases and waste air comprises feeding the exhaust gas stream onto an adsorber/catalyst monitored for its load, separating the exhaust gas stream from the adsorber when the charge state is below the maximum charge of the exhaust gas stream, and connecting to a circulating system. The circulating system consists of the adsorber/catalyst, a plasma generator, optionally a gas heater, and a measuring system for measuring the pollutant content of the circulating gas. After the gas has passed through the circulating system several times, the system is opened to indicate the absence of pollutants, the purified exhaust gas ejected and a new cycle of charging, purifying and ejection connected.

Multifunctional gas counter and multifunctional gas meter

Abstract: PROBLEM TO BE SOLVED: To provide a multifunctional gas meter that can count the integrated value of the quantity of a gas used by floor heating equipment or a gas heater with fan. SOLUTION: The multifunctional gas meter 1 has a main body 2 and a display 3. The main body 2 is provided with an integrated value counter 20 for specific apparatus, integrated value counter 25 for long time, integrated value counter 26 for large flow rate, integrated value counter 27 for designated time, and integrated value counter 28 for designated temperature time as electronic integrated value counters for the flow rate of the gas in addition to a normal integrated value counter 23. The integrated value counter 20 for specific apparatus can calculate the quantity of the gas used by the floor heating equipment or gas heater which uses the gas in a state where the quantity of the gas used is large in the initial stage, but decreases step by step as time elapses. Consequently, a charging system that discounts the gas rate to a specific gas appliance, the gas rate in a specific time zone, and so on, based on the integrated value can be realized.

Apparatus for the treatment of textile webs

Abstract: The assembly to dry wet fabric goods has a transport system to carry the spread material through a housing fitted with jets to blow a heated gas on to the fabric. A fan generates a recirculating gas flow. The gas temperature is raised by an indirect heating unit (6) with a cross counter-flow recuperator (60). The cross counter-flow recuperator, for the indirect heating unit in a fabric goods drying assembly, has a combustion chamber linked to the recuperator through a distributor (63). The unit has heat transfer components as flat tube bundles, with the combustion chamber between the bundles and parallel to them. The system also has additional guides to direct the recirculating gas flow at least twice across the line of the heat transfer bundles. The bundles form at least two heat exchanger zones (64a, 64b) for the gas flows. The second zone (64b) is hotter than the first zone (64a). The distributor also forms a heat exchange zone for the gas to flow through. The combustion zone is linked to an external burner at one end, and to the recuperator at the other end through the distributor. The exhaust gas collection point (65) is at the end of the combustion zone away from the burner, with a secondary gas channel link to the burner. The indirect gas heater has a further fan (67) to extract the exhaust gas from the recuperator by suction, and impel it selectively towards the combustion chamber and/or the exhaust gas outflow. A control (69) determines the exhaust gas volume flow to the combustion chamber and the outlet. The burner has a flame tube extending into the combustion chamber. The exhaust gas returned to the combustion chamber by the fan is in a ring-shaped flow around the flame tube. The exhaust gas outflow section has a fresh air heater (70), as an initial heating stage for the fresh air fed into the assembly. The tube bundles can be around the combustion chamber. The combustion chamber and the recuperator are on straight line, parallel to each other.

Air-conditioning system for vehicles, has gas heater cycle with electric heater in passenger compartment, where heater gets activated or deactivated based on variation of heating load to predetermined value

Abstract: The system has a hot gas heater cycle (H) for heating air blown into passenger compartment by introducing a discharged gas refrigerant from a compressor in the refrigerant cycle (C) into an interior heat exchanger (24). The gas heater cycle has electrical heater (30) in the passenger compartment. When the heating load is varied to a predetermined value, the electric heater gets activated or deactivated accordingly.

A gas heater for mounting within a wall

Abstract: A gas heater adapted for mounting within a wall 5 comprises a main body 2 and an operating panel 3, the main body having a combustion chamber 24 (not shown) and a cold water inlet 21, hot water outlet 23 and gas inlet 25 The main body may be retractably and detachably mounted in a housing 4 previously embedded in a hole in the wall When mounted, the pipes 51-53 are safely shielded and hidden from view by the operating panel Preferably the water heater has a control circuit comprising a water flow detector, a water temperature detector, a gas servo valve and a gas/air ratio valve for automatically maintaining the temperature of the hot water generated to that preset by control panel 30 The main body preferably comprises an air inlet chamber 27, with a fan motor 271 to draw air in from outside and expel it into the combustion chamber, to mix with the gas therein, the housing rear preferably including separate and remote air inlet and waste-gas outlet means The gas heater may also comprise a residue fire safety device 220 or a temperature fuse that activates automatically to cut-off the gas supply when the temperature within the main housing exceeds a pre-set amount

condensing gas furnace having cyclone exhaust device

Abstract: PURPOSE: A condensing gas heater having a cyclone exhauster is provided to cut down manufacturing cost by simplifying the structure of the exhauster, and to prevent a guide fan from being corroded by restricting inflow of condensate water. CONSTITUTION: A condensing gas heater is composed of a burner generating flame by burning gas; a heat exchanger and a condensing heat exchanger exchanging heat between high temperature combustion gas and indoor air; a guide fan(50) discharging combustion gas from the heat exchanger and the condensing heat exchanger; an exhaust pipe; and a cyclone exhauster(80) installed between the guide fan and the passage of the exhaust pipe to separate condensate water and combustion gas from the guide fan and discharge combustion gas through the exhaust pipe. The structure is simplified, and cost is reduced with installing the cyclone exhauster in the condensing gas heater. The corrosion of the guide fan is prevented with shutting off condensate flowing to the exhauster.

Engine valve and its manufacturing method

Abstract: PROBLEM TO BE SOLVED: To partially arrange a hardening coating film in an engine valve without joining separate metal to a base material. SOLUTION: After forming a prototype (a work) 10 of the engine valve having a shaft part 2, a shaft end part 5 and a shade part 3 by a predetermined base material, the hardening coating film is formed on a surface of the shaft end part of its work 10. A process of forming its hardening coating film, turns gas of the temperature lower than a melting point of a coating film material into a high speed flow by a nozzle 25a of an injector 25, collides a powdery coating film material at a high speed with the base material still in a solid phase state by inputting the powdery coating film material in its gas high speed flow, heightens the temperature of the coating film material more than the quenching temperature in its collision, and cools and quenches the coating film material becoming higher than the quenching temperature by ambient gas. The gas and the coating film material are preheated by a gas heater 22 and a material heater 24 before being respectively introduced into the injector 25. The work 10 is rotated by a clamp device 26. COPYRIGHT: (C)2009,JPO&INPIT

device for draining condensed water in condensing-type gas furnace

Abstract: PURPOSE: A condensate water discharge apparatus of a condensing gas heater is provided to discharge smoothly a condensate water as well as to protect an inside parts of an instrument from an external air. CONSTITUTION: A condensate water discharge apparatus of a condensing gas heater comprises a barrel for collecting the condensate water(20) provided at one side of a lower portion of a case and a float(30) provided into the barrel(20). The barrel for collecting the condensate water is formed in a rectangular box shape. Two passage holes(21,22) are formed at an upper surface thereof, and one passage hole(23) is formed at the side. One passage hole out of two passage holes(21,22) is a collect box side inlet(21) and is connected to a drain pipe for introducing the condensate water generated from a condensing heat exchanger. The other passage hole out of two passage holes(21,22) is an induction fan side inlet(22) and is connected to the drain pipe for introducing the condensate water generated when a combustion gas is discharged to an outside. The passage hole(23) of the side is drainage(23) for discharging finally the condensate water collected through the collect box side inlet(21) and the induction fan side inlet(22) at the outside.

device for exhausting gas in gas furnace

Abstract: PURPOSE: An exhaust system for a gas heater is provided to actively discharge combustion gas by preventing an exhaust pipe from being clogged. CONSTITUTION: An exhaust system of a gas heater comprises an exhaust pipe(11) penetrating wall(10); an air inlet pipe(12) absorbing air by being mounted on an outer circumference of the exhaust pipe; an exhaust pipe cap(20) combined to an end portion of the exhaust pipe; a pipe unit(21) having a cylinder shape; plural through holes(23) formed on the pipe unit; and a counter blow preventing unit(22) sealing the other side portion of the pipe unit. A middle portion of the counter blow preventing unit is protruded toward the exhaust pipe. A thread is formed on a combination portion between the exhaust pipe and the exhaust pipe cap. Thereby, the exhaust system of the gas heater actively discharges combustion gas by preventing the exhaust pipe from being clogged.

Plant for gas-dynamic deposition of coat from powdery materials

Abstract: metallurgical, mechanical, ship and car repair and other branches of industry. SUBSTANCE: invention is directed at deposition of coats by method of gas dynamic spraying on articles of any geometry and size from various powdery materials: metals, their alloys, ceramics, plastic materials. Plant has power- generating units, system supplying compressed gas and electricity, gas heater, system feeding powdery material that includes powder feeder-scale and spraying unit coming in the form of chamber to level flow and accelerating supersonic nozzle communicating with it, system controlling process and stop and control valves. It has aid for movement in the form of platform placed on mobile chassis and additional separable platform put on it, additional abrasive material feeder-scale, telescopic rod and fixing means. Additional feeder-scale, gas heater and telescopic rod with means fixing spraying unit are mounted on additional separable platform and powder feeder- scale of coating material and spraying unit are installed on rod. EFFECT: improved quality of coats. 6 cl, 2 dwg

Gas adsorption-drying plant

Abstract: mechanical engineering; compressor plants. SUBSTANCE: proposed invention can be used in compressor stations for filling cylinders with compressed natural gas. Plant has compressor and gas primary preparation unit. Drying and regeneration unit has two adsorbers connected in parallel in parallel to delivery line, gas drying line and adsorbent regeneration line. Adsorbers are connected to delivery line through adsorbent regeneration line and are interconnected in tandem in direction of gas flow by means of additional line. Gas filter, cooler and moisture-and-oil separator are installed in tandem in direction of gas flow on additional line. Moisture-and-oil separator is installed on compressor delivery line. Gas heater is made in form of recuperator installed on intermediate stage at delivery side. Recuperator is connected with delivery line of compressor last but one stage and last stage suction line by means of additional pipelines. EFFECT: provision of constant output. 2 cl

Brown Gas Heating Apparatus

Abstract: PURPOSE: A brown gas heater is provided to generate a large amount of energy with a small amount of brown gas and prevent the environmental pollution by using the clean brown gas. CONSTITUTION: A combustion chamber(20) has burner-fixing holes. An infrared ray radiating body is coated on the inner portion of the combustion chamber(20) to radiate the infrared ray. A header portion(21) is formed in the upper portion of the combustion chamber(20) by extending the combustion chamber(20) at a right angle. A radiator(40) is installed to transfer the combustion heat of the brown gas with heat pipes(41). A blower fan discharges the heat of the radiator(40) to the outside. A case(60) fixes and supports the components.

Multifunction gas water heater

Abstract: The utility model discloses a multi-functional gas water heater, the utility model comprises a water tank outer wall 1, an upper sealing block 2, a heat exchanger 3, a lower sealing block 4, a smoke discharging heat conduction pipe 5, a water tank inner wall 6, a bottom sealing circle 7, a water inlet 8, a water outlet 9, a heating booster, and a smoke discharging sealing cap. The adoption of the structure can make the heater not only provide heating hot water but also provide life used hot water to be used in shower, vegetable washing and cloth washing. The heating valve is closed in non-heating seasons, and the heater can be normally used. The multi-functional gas heater has simple structure, one thing multiple usage, and can operate without pressure. Normal gas furnace plate can be used to burn combustible gas, and cookery can also be used.

Efficiency firewood, stalks red infrared gas heater

Abstract: The utility model pertains to a straw infrared radiation highly-efficient thermal energy device, which applies the inflammable gas generated by straw stoves as the heat source and the inflammable gas is combusted in the heat-conducting oil stove through an infrared radiator to heat the medium oil heat exchange spiral coil; the heated medium oil enters the asphalt heating tank coil to indirectly heat the asphalt in a closed manner to improve the heat efficiency. Since the asphalt is kept from direct contact with naked flames, the utility model proves safety and reliability; besides, the after heat can be used for preheating of the tank to improve the work efficiency and reduce the production cost. The utility model therefore produces less pollutant and is energy-saving while guaranteeing the temperature required for the asphalt. Capable of ensuring civilized productions, the utility model can be applied to highway engineering.

U-shaped gas heater and method of its assembly

Abstract: devices for heat treatment of steel; metallurgical and engineering works. SUBSTANCE: U-shaped gas heater includes U-shaped body with burner and recuperative branches ; it is connected with twin equipped with gas burner unit, recuperator with perpendicular flue branch pipe, attachment plate and compensator; burner branch of heater body is mounted in attachment plate at spaced relation and is connected with one side of compensator over entire section; other side of compensator is connected with gas burner unit body over entire section and is closed with hermetic box rigidly connected with gas burner unit body and attachment plate. Recuperator is provided with detachable unit having flanges at its ends which is mounted between attachment plate and twin; it is provided with flue branch pipe whose axis is perpendicular to axis of detachable unit. EFFECT: enhanced durability of U-shaped gas heaters; unification of heaters; reduced consumption of natural gas. 3 cl, 2 dwg

Assembly for drying spread wet fabric goods has an indirect heating system, for the recirculating gas to dry the material, with a cross counter-flow recuperator

Abstract: The assembly to dry wet fabric goods has a transport system to carry the spread material through a housing fitted with jets to blow a heated gas on to the fabric. A fan generates a recirculating gas flow. The gas temperature is raised by an indirect heating unit (6) with a cross counter-flow recuperator (60). The cross counter-flow recuperator, for the indirect heating unit in a fabric goods drying assembly, has a combustion chamber linked to the recuperator through a distributor (63). The unit has heat transfer components as flat tube bundles, with the combustion chamber between the bundles and parallel to them. The system also has additional guides to direct the recirculating gas flow at least twice across the line of the heat transfer bundles. The bundles form at least two heat exchanger zones (64a, 64b) for the gas flows. The second zone (64b) is hotter than the first zone (64a). The distributor also forms a heat exchange zone for the gas to flow through. The combustion zone is linked to an external burner at one end, and to the recuperator at the other end through the distributor. The exhaust gas collection point (65) is at the end of the combustion zone away from the burner, with a secondary gas channel link to the burner. The indirect gas heater has a further fan (67) to extract the exhaust gas from the recuperator by suction, and impel it selectively towards the combustion chamber and/or the exhaust gas outflow. A control (69) determines the exhaust gas volume flow to the combustion chamber and the outlet. The burner has a flame tube extending into the combustion chamber. The exhaust gas returned to the combustion chamber by the fan is in a ring-shaped flow around the flame tube. The exhaust gas outflow section has a fresh air heater (70), as an initial heating stage for the fresh air fed into the assembly. The tube bundles can be around the combustion chamber. The combustion chamber and the recuperator are on straight line, parallel to each other.

Apparatus for depositing the organic semiconductor device with a large size of substrate

Abstract: PURPOSE: An apparatus for depositing an organic semiconductor with a large size of substrate is provided to make grains of an organic material uniformly distributed through a slit by a heat source, by installing a metal deposition source in a scan head such that the metal deposition source is composed of the heat source, a heat source supporting part and the slit. CONSTITUTION: A mass flow controller(MFC) controls the flow of the inert gas in a gas reservoir. A gas heater heats transfer gas. A high temperature gas transferring pipe(7) transfers the inert gas heated by the gas heater. A heat source intercepting unit intercepts an increase of temperature inside a deposition chamber. A plurality of heat sources(22) for heating a unit metal melt and vaporize metal materials including Al, Mg, Ag, Ca and LiF as a metal material solvent by using a resistor heat source, controlled by the MFC and connected through the high temperature transferring pipe. At least one slit(24) exhausts and uniformly maintains the metal material transferred by the plurality of heat sources for heating the unit metal. A driving unit drives the metal deposition material itself. A control unit for controlling the gas deposition rate transfers the vaporized metal deposition material through the slit from the metal deposition material. A plurality of metal deposition sources reduce a thermal impact on an organic thin film when the vaporized metal deposition material is deposited, depositing the metal deposition material while reciprocating with respect to a substrate.

Frozen dough burner with fan using gas heater

Abstract: PROBLEM TO BE SOLVED: To provide an apparatus which permits easy burning of frozen dough or the like at home using a gas heater. SOLUTION: The frozen dough or the like is put in an oven (3), and then a fan (2) is turned to circulate heated air within the airtight oven (3), making bread burnt brown, soft and full.

Split type water heater

Abstract: A separate water heater comprises a solar heat-collecting tube (1), reflective panel (2), reflecting panel stent (3), hose of solar heat-collecting tube (4), storage tank (5), electric heater (6), gas heater (7), inlet pipe (8), outlet pipe (9) and overflow pipes (10) and has prominent advantages: changing the restriction which the solar water heater must be arranged on the roof, expanding greatly the scope of the use of solar water heater, using electricity, gas, solar energy and other heating methods, both economical and practical, guaranteeing hot water enough, eradicating completely the risk factor of easily poisoning due to anoxycausis of the gas water heater, saving energy, facilitating environmental protection, cleanness and high efficiency, most of the arrangement, use and maintenance operations on the indoor or outdoor walls rather than climbing on the roof, facilitating users greatly.