Abstract:
In a water heating system, vapor in the products of combustion gases is condensed in a secondary heat exchanger (22) positioned in a housing with the primary heat exchanger (20) and combustion chamber (44). The two heat exchangers are coaxial coils with the secondary coil surrounding the primary. Gases flow radially through the primary coil, axially along a baffle (46) and then axially through the secondary coil at an increased velocity. The gas/air mixture is burned in a burner (50) within the primary heat exchanger and the gas product are drawn through the exchangers by a blower (58). A water storage tank (34) is designed to enhance stratification of hot water over cooler water. The cooler water is used to condense vapor in the secondary heat exchanger.
Abstract:
A hollow fiber contactor and process for fluid treatment having forced circulation with entry of fluid to be treated through the open ended lumen of a porous input hollow fiber having its opposite end closed and exit of treated fluid through the open ended lumen of an adjacent or nearby porous output hollow fiber having its opposite end closed. Fluid to be treated passes through the porous wall of an input hollow fiber, passes in contact with a treatment medium between the input and output hollow fibers forming treated fluid which passes through the porous wall of an output hollow fiber and exits the process. This invention provides high contact with treatment medium between the hollow fibers, especially suitable for selective sorption for gas purification or separation and for conduct of catalytic reactions.
Abstract:
A process and system for removing hydrogen sulfide from a gaseous stream such as one of natural gas. A sour gas stream containing H2S is contacted with a nonaqueous, water-insoluble sorbing liquor which comprises an organic solvent for elemental sulfur, dissolved elemental sulfur, an organic base to promote the reactions, and an organic solubilizing agent, an agent suitable for maintaining the solubility of polysulfide intermediates which may otherwise separate when they are formed during operation of the process. Hydrogen sulfide (H2S) gas is sorbed into this liquor and then reacts with the dissolved sulfur in the presence of the base to form polysulfide molecules. The solution is then sent to a reactor where sufficient residence time is provided to allow the polysulfide forming reactions to reach the desired degree of completion. From the reactor, the solution flows to a regenerator where the solution is oxidized (e.g., by contact with air), forming dissolved elemental sulfur and water. The temperature of the solution is then lowered, forming sulfur crystals, which are easily removed by gravity settling, filtration, centrifuge, or other separation method. Enough sulfur remains dissolved in the solution following removal of the sulfur crystals that when this solution is reheated and returned to the absorber a sufficient amount of sulfur is present to react with the inlet H2S gas.
Abstract:
An apparatus and system for the fast-filling of cylinders (11) for natural gas powered vehicles, employing a simplified physical arrangement and an improved control method to obtain maximum safe filling of the cylinders, which takes into account the presence of residual gas in the cylinders.
Abstract:
An apparatus (100) and a method for substantially cancelling impulsive noise from data. Such substantial cancellation is achieved by converting the time-domain data into its corresponding frequency domain by a time to frequency domain converter (210), such that the impulsive noise threshold can be determined. Once such threshold is determined, all frequency components less than this threshold are cancelled with the resulting spectrum being converted back to the time-domain by a frequency to time domain converter (240). This substantially impulse free signal can then be substituted into the original signal where the impulsive noise occurs, thus, resulting in a signal having minimally distorted data that is substantially devoid of any impulsive noise. This signal may be further processed by an adaptive filter stage to substantially remove any remaining noise from the signal.
Abstract:
An apparatus and method for measuring a breakdown voltage between two electrodes separated by a dielectric. The output of a sensor perceiving the voltage across the two electrodes is transferred to a peak-hold circuit. A spark through the dielectric and across the two electrodes is detected. Restrikes between the electrodes are clamped by precluding further transfers of sensor output to the peak-hold circuit for a predetermined period of time subsequent to the detected occurrence of the spark.
Abstract:
A method for reducing the formation of nitrogen oxides (NOx)in air-fuel and oxygen-enriched air-fuel burners is disclosed wherein oxygen is introduced directly into the visible flame from the burner, whereby the beneficial effects of oxygen enrichment and the reduced formation of NOx can be realized simultaneously in the operation of such burners.
Abstract:
A two-compartment, automated apparatus and a semi-batch process for achieving rapid and complete thawing of a frozen food product, such as french fry potatoes, prior to cooking are disclosed. This invention results in a rapid, economical thawing of frozen food that is especially compatible with automated, commercial-scale deep frying operations.
Abstract:
A gas fired melting apparatus (20) for particulate material. The melting apparatus has four successively connected vertically disposed sidewall members (28, 30, 32, 34), a floor member (26) and a roof member (24). These members define a cubic melting chamber (22) for containing a freestanding generally conical pile of particulate material to be melted. The relative sizes, shapes and positions of the chamber radiating surfaces as well as their relative distances from the pile surfaces promote heat transfer to the pile. A high temperature gas fired burner (45) is mounted in each sidewall adjacent to the corner formed by the tail end of one sidewall and the head end of a successive sidewall member. The axis of each burner is parallel with its successive wall member so the combined effect of the burners is to produce a toroidal flow of combustion products in the melting chamber around its central vertical axis.
Abstract:
An absorption refrigeration system having absorber and generator elements and a solution pump flowing relatively dilute refrigeration solution from a system absorber sub-atmospheric operating pressure to a system generator operating pressure is provided with novel low-pressure-differential, positive-displacement purge pump apparatus that is driven by bleed relatively dilute refrigeration solution taken from the solution pump high-pressure side, flowed through a coiled tube flow restrictor device to substantially reduce bleed solution operating pressure, and then through an inverted vertical U-tube that includes a V-shaped entrapment zone that receives un-wanted, non-condensed gases purged from the system absorber element. The entrapped un-wanted gases are composed by gravitational forces and then flowed through the system solution pump to the generator element for re-separation and for subsequent accumulation and venting to the atmosphere without requiring system shut-down for purging purposes or the use of a separate mechanical vacuum pump.