235 results about "Natural gas fuel" patented technology

An air flow regulation system for enhancing the performance of oxidation catalyst in the exhaust stream of an internal combustion engine is provided wherein air flow into the exhaust upstream of an oxidation catalyst is dynamically controlled via a controlled feedback loop to ensure sufficient oxygen availability to induce enhanced oxidation catalyst performance while simultaneously limiting the exhaust cooling effect of the incoming air stream and the associated loss of catalytic conversion performance. The modulation of air temperature and flow into the exhaust gas stream of a reciprocating internal combustion natural gas fuel engine upstream of an oxidation catalyst is regulated such that oxidation of carbon monoxide, hydrocarbons, and ammonia is achieved to a level beyond the levels attainable and maintainable with a catalyst strategy that relies only upon pre-combustion air/fuel ratio management. In one aspect, the modulation of air flow into the exhaust is via an electronically controlled feedback loop. In another aspect, the induced air is heated to assure catalyst performance and retard the loss of recoverable heat from the exhaust stream for combined heat and power applications.

A process for increasing the selectivity of an alkanolamine absorption process for selectively removing hydrogen sulfide (H₂S) from a gas mixture which also contains carbon dioxide (CO₂) and possibly other acidic gases such as COS, HCN, CS₂ and sulfur derivatives of C₁ to C₄ hydrocarbons, comprises contacting the gas mixture with a liquid absorbent which is a severely sterically hindered capped alkanolamine or more basic sterically hindered secondary and tertiary amine. The improvement in selectivity is achieved at the high(er) pressures, typically least about 10 bara at conditions nearing the H₂S/CO₂ equilibrium at which CO₂ begins to displace absorbed hydrosulfide species from the absorbent solution.

A modular portable gas grill including an energy management system for even temperature control, enhanced flavor devices, and electronic, electromechanical, or mechanical controls is provided. The grill includes a touch control system including sliders or knobs providing efficient, precise and accurate control. Heat and flame deflecting shields provide an improved air draft, heat, and flavoring system and can be removed for cleaning. Modular design construction and a quick-connect gas manifold permit the addition of additional components at a later date such as a rotisserie, and a smoke chute for flavoring. Burner shields protect the burner and flame from greases and liquids. The grill also features the ability to easily convert between propane and natural gas fuel and an electronic reigniting system providing individualized control to the burners. The grill also features a dual fuel mode giving a user the ability to use propane or natural gas along with charcoal or other solid fuel.

Systems, compositions, and methods for removing a substance or substances from a material, such as a gas or liquid material, are described. The compositions can comprise composite removal particles. In some embodiments, the composite removal particles can be comprised of support particles made from an inexpensive carrier material, and a reactive particle borne on the support particle. The reactive particle reacts with the substance or substances in the material. The reacted composite removal particles can then be removed from the material, which reduces the amount of the substance or substances present in the material. The composite removal particles are useful for removing pollutants, such as mercury, from exhaust gases, such as flue gas from a power plant combustion unit, and from other materials such as natural gas, liquefied natural gas, fuels, hydrocarbons, petrochemicals, and refinery streams.

A gas fuel nozzle for mounting in a combustor wall of a gas turbine engine, with an at least partially radially-directed array of gas fuel outlets extending beyond an air flow head having an array of compressed air jet apertures around the gas fuel outlets. The air flow head also has a deflector for creating an axial flow of air for deflecting in an axial direction the radially-injected gas fuel.

The invention provides a method for producing liquefied natural gas by using coke oven gas. The method comprises the following steps: (1) the coke oven gas is pretreated to remove benzene, naphthalene, tar and HCN (hydrogen cyanide); (2) sulfur is removed; (3) carbon is removed and the coke oven gas is dried; (4) the coke oven gas is led to a first heat exchanger and pre-cooled; (5) the pre-cooled coke oven gas passes through a second heat exchanger, a reboiler at the bottom of a low-temperature rectifying tower and a third heat exchanger in sequence, so that the temperature is lowered step by step; (6) gaseous liquid coming out of the third heat exchanger is led to a gas-liquid separator for gas-liquid separation, then the liquid coming out of the gas-liquid separator enters the low-temperature rectifying tower, and a liquefied natural gas product is acquired at the bottom of the low-temperature rectifying tower; and otherwise, the gaseous liquid coming out of the third heat exchanger is directly led to the low-temperature rectifying tower, and the liquefied natural gas product is acquired at the bottom of the low-temperature rectifying tower. The method for producing the liquefied natural gas by using the coke oven gas as raw material has the advantages of high output as well as low energy consumption and cost, and is easy to operate.

A natural gas fueled, direct carbon fuel cell produces electricity and hydrogen. It adds to an existing direct carbon fuel cell a carbon dioxide injection port to the cathode compartment; a natural gas feed port to the anode compartment, a hydrogen extraction port from the anode compartment, and a carbon dioxide extraction port from the anode compartment. To improve hydrogen generation efficiency, the anode compartment may have a louvered baffle dividing the anode compartment into an ante-chamber and a main chamber. The louvered baffle preferably has an upper section with slats angled from bottom to top and a lower section with slats angled from top to bottom. A heat exchanger is preferably included to pre-heat natural gas feed from hot hydrogen effluent. A second heat exchanger is preferably included to pre-heat oxygen-containing gas with hot nitrogen and carbon dioxide effluents.

An internal combustion engine that can operate with 100% liquid fuel, 100% gaseous fuel and any combination in between includes a pressure expansion device used to reduce gaseous fuel pressure from the storage tank pressure to gaseous fuel injection pressure, and to extract energy from the expansion process. In one embodiment, the pressure expansion device is an air compressor that compresses intake air to an elevated pressure. In another embodiment, the pressure expansion device is a turbine, connecting to an alternator by a coupling, to generate electricity to charge the battery. The temperature of the pressure expansion device is controlled by a circuit of engine coolant or ambient air to avoid excessive deviation from room temperature. The cooled ambient air is used to cool the cabin temperature. In a further embodiment, the pressure expansion device is a turbocharger that comprises of a turbine and a compression fan.

A machine includes a machine body and a dual fuel compression ignition engine attached to the machine body. A dual fuel system is operably coupled to supply the engine with liquid diesel fuel and natural gas fuel directly into respective cylinders of the engine. The fuel system includes an insulated tank for storing the natural gas fuel, a pressure sensor positioned to measure fluid pressure within the tank, and a pump for drawing the natural gas fuel from the tank. An electronic controller is in communication with the pressure sensor and has a cryogenic system diagnostics algorithm executable thereon that is configured to receive a pressure signal from the pressure sensor, detect a cryogenic system fault based on the signal, and generate a notification signal based on the fault.

The invention discloses a natural gas engine powder metallurgy valve seat ring material. The natural gas engine powder metallurgy valve seat ring material contains the following element raw materials in percentage by weight: 0.6-1.5% of C, 0.3-1.5% of S, 3-10% of Cr, 4-12% of Mo, 0.5-5% of Ni, 3-10% of Co, 10-20% of Cu, 1-2.5% of Mn, 1-4% of V, 2-7% of W and the balance of Fe. The natural gas engine powder metallurgy valve seat ring material disclosed by the invention can effectively improve the abrasion resistance of the powder metallurgy seat ring and meet the working conditions and the requirements of a natural gas fuel engine.

The present invention relates to a method which contains carbon dioxide replacement and is used for absorbing methane in condensed coal bed gas through pressure varying mode. The method mainly comprises the following steps: absorbing the feed gas, replacing the working substance gas, regenerating the bed layer, charging the secondary product gas, recovering the working substance gas, etc., wherein, the replacing of working substance gas adopts an operation mode of pressurized replacing or normal-pressure replacing, namely the carbon dioxide is used for replacing and absorbing the methane under the absorption pressure, or under the normal pressure. The invention causes that the methane becomes the tower top product thereby increasing the concentration and yield of methane of product gas. The product gas obtained from the coal bed gas with 20% of methane concentration. The recovery rate obtains 90%. The method of the invention is suitable for the coal bed gases with different methane contents. The coal bed gas with low methane concentration can be changed into the high-quality natural gas fuel with a low cost. The product gas can be conveyed through pipe and can be stored with pot.

Natural gas is produced when LNG that is contained in an insulated LNG cargo tank(s) of a non-self-propelled LNG carrier (i.e., a barge) evaporates as a result of heat leakage through the walls of the insulated cargo tank(s). The natural gas is transferred from the barge to a tugboat or a towboat that is equipped with natural gas burning engines through a flexible gas transfer assembly so that the tugboat is powered by the natural gas fuel. The pressure in the cargo tank(s) on the barge is, therefore, effectively managed to prevent or substantially reduce the buildup of pressure within the LNG cargo tank(s). The LNG can then be contained within the LNG cargo tank(s) for an appropriate period of time and can be delivered at an appropriate and acceptable equilibrium pressure and temperature.

A laser spark distribution and ignition system that reduces the high power optical requirements for use in a laser ignition and distribution system allowing for the use of optical fibers for delivering the low peak energy pumping pulses to a laser amplifier or laser oscillator. An optical distributor distributes and delivers optical pumping energy from an optical pumping source to multiple combustion chambers incorporating laser oscillators or laser amplifiers for inducing a laser spark within a combustion chamber. The optical distributor preferably includes a single rotating mirror or lens which deflects the optical pumping energy from the axis of rotation and into a plurality of distinct optical fibers each connected to a respective laser media or amplifier coupled to an associated combustion chamber. The laser spark generators preferably produce a high peak power laser spark, from a single low power pulse. The laser spark distribution and ignition system has application in natural gas fueled reciprocating engines, turbine combustors, explosives and laser induced breakdown spectroscopy diagnostic sensors.

A home based fast-fill natural gas refueling station for providing natural gas fuel to a vehicle. A compressor is attached to the natural gas fill line. The compressor functions to pressurize a natural gas storage tank array. The storage tank array includes a plurality of natural gas storage tanks. A pressurized natural gas storage tank exit line is connected to a frontmost storage tank and a fill nozzle is connected to the storage tank exit line. During the refueling process the compressor is turned off. Also, during the refueling process as the pressure is depleted in the frontmost storage tank the frontmost storage tank is simultaneously and rapidly repressurized by other storage tanks in the storage tank array allowing for fast refueling of the vehicle.

A natural gas engine equipped with a mechanism that introduces exhaust gas into a cylinder during an intake stroke, and in which an amount of diesel fuel injected into a cylinder is set to a diesel fuel amount for idling condition across an entire operating region of an engine, engine output is increased or decreased by increasing or decreasing an amount of a natural gas fuel, and fuel injection of the diesel fuel into a cylinder is performed using multi-injection in a high load region in which the accelerator opening degree is greater than a preset first opening degree.

The invention discloses a process for producing ammonia from urea used for denitration of boiler smoke and a system thereof. The process has the following flow: feeding a urea solution into a decomposition chamber by a urea solution feeding system; and heating and decomposing the urea solution into ammonia in the decomposition chamber, wherein a heat source for heating the urea solution in the decomposition chamber is air heated by heat in a boiler. The invention adopts the heat in the boiler as the heat source instead of traditional diesel and gas fuel, thus saving the energy resources, greatly lowering the operation cost and improving the system economy, and the process in the invention has safer and more reliable operation compared with the process utilizing fuels such as diesel, gas and the like as the heat source.

The invention relates to a cooling, heating and generation and hot-water supply combined system driven by a proton film fuel cell. The cooling, heating and generation and hot-water supply combined system comprises the fuel cell, a first water pump, an auxiliary heating device, a second water pump, a third water pump, a storage heat exchange device, an absorptive cold and hot water unit, a fan coiler and air-conditioner end equipment, which are communicated through pipelines. The waste heat of the fuel cell is utilized, and solar renewable energy sources are introduced, so that the problems of generation of living buildings, heating in winter, cooling in summer and daily water usage of buildings are solved. Combining waste heat of the natural gas fuel cell with the solar hot water system, high-temperature hot water is generated, the absorptive cold and hot water unit can be started for cooling and heating of an air conditioner, hot water flowing out of the absorptive cold and hot water unit can be used for daily life after treated through a heat exchanger, gradient utilization of the energy sources is realized and utilization rate of fossil fuel is increased.

A process for converting natural gas from which contaminants have been sufficiently removed to acetylene includes heating the purified gas through a selected range of temperature for adequate time or combustion of the purified gas at adequate temperature within a suitable environment during an adequate reaction time to convert a fraction of the gas stream to acetylene, wherein the acetylene is directed for other processes, reactions, and uses. A process for converting natural gas to liquid hydrocarbons by combusting externally derived hydrogen for heating natural gas to a selected range of temperature. A process for converting natural gas to liquid hydrocarbons by reacting conversion products with externally derived hydrogen to form olefins comprising ethylene, and catalytically forming liquid hydrocarbons from the olefins comprising ethylene.

Systems and methods to create and store a liquid phase mix of natural gas absorbed in light-hydrocarbon solvents under temperatures and pressures that facilitate improved volumetric ratios of the stored natural gas as compared to CNG and PLNG at the same temperatures and pressures of less than −80° to about −120° F. and about 300 psig to about 900 psig. Preferred solvents include ethane, propane and butane, and natural gas liquid (NGL) and liquid pressurized gas (LPG) solvents. Systems and methods for receiving raw production or semi-conditioned natural gas, conditioning the gas, producing a liquid phase mix of natural gas absorbed in a light-hydrocarbon solvent, and transporting the mix to a market where pipeline quality gas or fractionated products are delivered in a manner utilizing less energy than CNG, PLNG or LNG systems with better cargo-mass to containment-mass ratio for the natural gas component than CNG systems.

The invention discloses a vehicular saturation flow control device of natural gas fuel. The vehicular saturation flow control device comprises vehicular natural gas storing equipment which is internally provided with a temperature sensing device, and is characterized in that the vehicular natural gas storing equipment is connected with a water-bath type carburetor, a pressure adjusting valve and a buffer tank in sequence and in series by pipelines; the buffer tank is connected with a coil pipe component in the vehicular natural gas storing equipment by a gas return coil pipe which is provided with a stop valve; the coil pipe component is arranged on a liquid-phase part of the vehicular natural gas storing equipment by a fixed bracket; and normal-temperature gas in the gas return coil pipe is transferred to the coil pipe component and carries out heat convection with low-temperature liquid in the vehicular natural gas storing equipment, so that the temperature and the pressure in the vehicular natural gas storing equipment can rise stably. The vehicular saturation flow control device has the advantages of quick pressure rising, stable pressure in a control cylinder, good effect and low cost.

A method for producing pressurized liquefied natural gas and a production system therefor are provided. The method for producing pressurized liquefied natural gas includes: performing a dehydration process to remove water from natural gas supplied from a natural gas field, without a process of removing acid gas from the natural gas; and performing a liquefaction process to produce pressurized liquefied natural gas by liquefying the natural gas, which has undergone the dehydration process, at a pressure of 13 to 25 bar and a temperature of −120 to −95° C., without a process of fractionating natural gas liquid (NGL). Accordingly, it is possible to reduce plant construction costs and maintenance expenses and reduce LNG production costs. In addition, it is possible to guarantee high economic profit and reduce payback period in small and medium-sized gas fields, from which economic feasibility could not be ensured by the use of a conventional method.

A computerized system for accurate, independent verification of natural gas fuel flow in order to control H₂O injection flows. The H₂O is injected into a combustion system to control emissions. The system comprises:

• receiving gas turbine control parameters from a gas turbine control system;
• receiving control parameters from a megawatt transducer;
• calculating values based upon readings from said control system and said megawatt transducer;
• comparing said values to a megawatt reference curve;
• detecting an abnormal reading;
• starting a timing sequence during which said reading is monitored;
• transferring NO_x and H₂O water injection control to a megawatt module at completion of said timing sequence;
• alerting operator said transfer;
• allowing for return of control to said gas turbine control system once said abnormal reading is corrected.