32 results about "Autoignition temperature" patented technology

The invention discloses a rapid cold start flameless combustion furnace and a control method, and relates to the technical field of combustion equipment.The rapid cold start flameless combustion furnace comprises a combustion furnace body and an inductance heating assembly, a combustion cavity is formed in the combustion furnace body, and the combustion cavity is provided with an air jet nozzle, a fuel nozzle and a tail gas exhaust port; the air jet nozzle and the fuel nozzle are oppositely distributed on the two opposite sides of the combustion cavity and arranged in an opposite jet mode, and the furnace wall of the combustion cavity is a metal component. The inductance heating assembly comprises an inductance coil spirally surrounding the periphery of the combustion furnace body, and the area surrounded by the inductance coil corresponds to the combustion cavity. According to the flameless combustion furnace, the furnace wall of the combustion cavity which is a metal component is heated through the inductance coil, so that the temperature in the combustion cavity is rapidly increased, the temperature of the furnace wall of the combustion cavity is higher than the spontaneous combustion temperature of fuel, the fuel is ignited, and rapid cold start and stable combustion of the flameless combustion furnace are achieved.

An apparatus can be arranged and configured so that after a gas turbine is shut down due to a detected condition, a higher autoignition temperature fuel can be utilized to purge a fuel delivery system and facilitate a quicker restart of the turbine. Embodiments can utilize conduits, valves, and a control system for detection of a fault condition warranting a shut down, purging of a lower autoignition temperature fuel via venting and use of a higher autoignition temperature fuel for purging to facilitate subsequent restarting of the turbine. Embodiments can be configured so an inert gas purge is not needed for venting and purging of the fuel delivery system.

An apparatus can be arranged and configured so that after a gas turbine is shut down due to a detected condition, a higher autoignition temperature fuel can be utilized to purge a fuel delivery system and facilitate a quicker restart of the turbine. Embodiments can utilize conduits, valves, and a control system for detection of a fault condition warranting a shut down, purging of a lower autoignition temperature fuel via venting and use of a higher autoignition temperature fuel for purging to facilitate subsequent restarting of the turbine. Embodiments can be configured so an inert gas purge is not needed for venting and purging of the fuel delivery system.

An aircraft gas turbine includes a combustor that combusts compressed air and at least one fuel flow from at least one fuel source to generate combustion gases. A fuel supply system is arranged to provide at least one of a first flow of fuel to the combustor via a first fuel supply line and a second flow of a heated fuel to the combustor via a second fuel supply line. A fuel heat exchanger is arranged within the fuel supply system to generate the heated fuel that is heated above an autoignition temperature of the fuel, and a heat source communicates with the fuel heat exchanger for generating the heated fuel.

Auto-igniting booster gas generant compositions according to various implementations include a primary fuel and at least two additives. The fuel may be a tetrazole or salt of tetrazole, such as 5-aminotetrazole, whereas the additives include boron carbide and molybdenum trioxide. The compositions may also include a secondary fuel, preferably potassium salt of 5-aminotetrazole. The auto-igniting booster gas generant compositions have an auto-ignition temperature of 200 degrees Celsius or less, self-igniting in the presence of an external heat source. The compositions may also include an oxidizer, such as potassium nitrate. Optionally, the auto-igniting booster gas generant compositions may include additional components, such as processing lubricants. For example, the compositions may include polyethylene to aid in processing and manufacturing.

The invention discloses a stable spontaneous combustion ignition pre-combustion chamber system, an internal combustion engine and an operation method.The stable spontaneous combustion ignition pre-combustion chamber system comprises a pre-combustion chamber body and an air valve assembly. Gas-state low-spontaneous-combustion-temperature fuel is introduced into a pre-combustion chamber in the high-pressure state of the pre-combustion chamber through reciprocating motion of a valve rod and a closed air valve; the pre-combustion chamber can be introduced near the compression top dead center of the internal combustion engine, gaseous low-spontaneous-ignition-temperature fuel can be introduced under the condition that the pressure of the pre-combustion chamber is high, spontaneous combustion is conducted to ignite the pre-combustion chamber, and the high-pressure injection requirement and the pre-combustion chamber coking problem are avoided. Fuel is introduced to generate spontaneous combustion and ignite mixed gas in the pre-combustion chamber, an ignition device does not need to be arranged in the pre-combustion chamber, in addition, through sequential opening and closing of the valve rod and the closed air valve, the fuel supply cavity can be communicated with the pre-combustion chamber without passing through the fuel temporary storage space, and then the fuel is prevented from directly entering the pre-combustion chamber through the fuel temporary storage space; and abnormal ignition of the pre-combustion chamber is avoided.

A lubricating oil composition configured for lubricating an internal combustion engine fueled with an alternative fuel having an auto-ignition temperature greater than about 700K. The lubricating oil composition includes at least a detergent system including at least one overbased metal-containing sulfonate detergent, optionally at least one neutral to low-based metal containing sulfonate detergent, and where the metal provided from the overbased sulfonate detergent is balanced relative to the total detergent metal and / or the composition total base number.

The present invention relates to a method for determining whether to use spontaneous combustion or artificial ignition in an oil reservoir, which comprises the following steps: step one, using an accelerating calorimeter to determine the spontaneous combustion temperature; step two, considering the oxidation time required to reach a certain spontaneous combustion temperature when heat loss is taken into account; step three, determining whether to use spontaneous combustion or artificial ignition; the spontaneous combustion temperature is determined by experiment, and the oxidation time required to reach the spontaneous combustion temperature is calculated in step two; if the decrease in oil production caused by the delay of combustion results in a decrease in income that is greater than the cost of artificial ignition, then artificial ignition is used, otherwise, spontaneous combustion is used. The present invention can design a more economically efficient oil production method, and if the oil reservoir can spontaneously combust, expensive artificial ignition equipment does not need to be invested.

A lubricating oil composition configured for lubricating an internal combustion engine fueled with an alternative fuel having an autoignition temperature above about 700K. The lubricating oil composition comprises at least a detergent system comprising at least one overbased metal sulfonate-containing detergent, at least one neutral to low-based metal sulfonate-containing detergent, and at least one overbased metal phenate-containing detergent, wherein the metals provided by the overbased sulfonate detergent are appropriately balanced relative to the total detergent metals and / or the total base number of the composition.

The invention discloses a testing device and method for measuring the flash-burning spontaneous combustion temperature of a material through a hot air furnace method, the testing device comprises a heating furnace system, an air supply system, a testing system and an intelligent control system, the heating furnace system is used for heating a sample and decomposing the sample to generate combustible gas; the air supply system is used for providing stable, clean and flow-controllable air flow for the heating furnace system; the test system is used for periodically generating a pilot ignition source at a furnace mouth and detecting whether combustion occurs or not; and the intelligent control system is integrated with a touch screen man-machine interaction interface and is used for controlling the operation, parameter setting and data acquisition and processing of the whole device. By adopting the results, the problems that a traditional simple device is low in temperature control precision, low in automation stability degree, large in manual operation error, low in safety, insufficient in standard adaptability, capable of meeting the requirements of transnational standard compatibility detection differentiation and the like, tedious in data recording and the like are solved. The detection device has the advantages that the size is small, the automation degree is high, the weight is light, the operation steps are simple and convenient, the operation of the microcomputer PC upper computer and the operation of the touch screen are controlled, and the like, and the detection device can be used for detecting the flash burning temperature (FIT, flash-ignition temperature) and the self-ignition temperature (SIT, self-ignition temperature) of the material in a laboratory or in a monitoring field. The method is high in safety, high in treatment speed, simple in process and suitable for large-scale industrial production.

An apparatus can be arranged and configured so that after a gas turbine is shut down due to a detected condition, a higher autoignition temperature fuel can be utilized to purge a fuel delivery system and facilitate a quicker restart of the turbine. Embodiments can utilize conduits, valves, and a control system for detection of a fault condition warranting a shut down, purging of a lower autoignition temperature fuel via venting and use of a higher autoignition temperature fuel for purging to facilitate subsequent restarting of the turbine. Embodiments can be configured so an inert gas purge is not needed for venting and purging of the fuel delivery system.

Disclosed in the present invention is a diffuse regenerative combustion industrial furnace, comprising a furnace chamber, an airflow reversing system and at least two regenerative boxes, wherein burners are mounted on the furnace chamber, at least two burners are provided, and within a period of time in a low-temperature stage, the at least two burners maintain continuous operation without interruption, the low-temperature stage referring to a period of time in which the temperature in the furnace chamber has not reached the auto-ignition temperature of fuel. Further provided in the present invention is a heating method for heating a material by using the diffuse regenerative combustion industrial furnace described above. The diffuse regenerative combustion industrial furnace of the present invention completely eliminates the risk of deflagration in a diffuse regenerative combustion system, resulting in significantly higher safety and significantly improved production efficiency, and successfully solving the problem in the prior art of low production rate.

A method of providing flameless combustion includes forming a pre-heated reactant stream in a primary reaction zone by reacting a first stream of fuel and a first stream of undiluted oxidant and maintaining a combustible air / fuel ratio within flammability limits of the fuel. Forming a combustion stream by reacting a first stream of diluted oxidant, a second stream of fuel, and the pre-heated reactant stream in at least one secondary reaction zone downstream of the primary reaction zone. The combustion stream is maintained at a bulk combustion temperature below an auto-ignition temperature of the combustion stream. A composition of the combustion stream and the bulk combustion temperature are adjusted to maintain combustion marginally above a lower ignition limit boundary of the combustion stream. Upon the composition and the bulk combustion temperature reaching pre-determined flameless combustion conditions, the bulk combustion temperature is increased above an auto-ignition temperature of the combustion stream.

A method of providing flameless combustion includes forming a pre-heated reactant stream in a primary reaction zone by reacting a first stream of fuel and a first stream of undiluted oxidant and maintaining a combustible air / fuel ratio within flammability limits of the fuel. Forming a combustion stream by reacting a first stream of diluted oxidant, a second stream of fuel, and the pre-heated reactant stream in at least one secondary reaction zone downstream of the primary reaction zone. The combustion stream is maintained at a bulk combustion temperature below an auto-ignition temperature of the combustion stream. A composition of the combustion stream and the bulk combustion temperature are adjusted to maintain combustion marginally above a lower ignition limit boundary of the combustion stream. Upon the composition and the bulk combustion temperature reaching pre-determined flameless combustion conditions, the bulk combustion temperature is increased above an auto-ignition temperature of the combustion stream.

To provide a gas detector capable of keeping the inside of a heating furnace in a high temperature state while suppressing unexpected combustion or explosion.SOLUTION: The gas detector 6 includes a gas concentration detector 14 for detecting the concentration of the fuel gas in the heating furnace 4, a temperature sensor 10 for detecting the temperature in the heating furnace 4, and a controller 24 for determining whether the temperature is lower than the self-combustion temperature of the fuel gas and causing the gas concentration detector 14 to detect the concentration of the fuel gas until the temperature reaches the self-combustion temperature of the fuel gas.SELECTED DRAWING: Figure 1

Various embodiments described herein are related to a flame mitigation device that can comprise a rigid body comprising a side wall having a first perforation of a first size and a second perforation of a second size. The rigid body can be hollow and the first size can be greater than the second size Also, the first perforation and the second perforation can provide fluid communication through the side wall. Moreover, the flame mitigation device is configured to absorb enough heat to drop a burning air / fuel mixture below its auto-ignition temperature at a flame speed between 4 and 6 meters per second.

A lubricating oil composition configured for lubricating an internal combustion engine fueled with an alternative fuel having an autoignition temperature above about 700K. The lubricating oil composition comprises at least a detergent system comprising at least one overbased metal sulfonate-containing detergent, optionally at least one neutral to low based metal sulfonate-containing detergent, and wherein the metals provided by the overbased sulfonate detergent are balanced relative to the total detergent metals and / or the total base number of the composition.

A method for heating a reactor using a multifunctional burner, the method comprising feeding a primary fuel through an annular passage, feeding oxygen through a central passage within the annular passage, and feeding an auxiliary fuel through a central lance within the central passage to produce a flame extending into a furnace having a temperature and pressure; wherein the flow rates of auxiliary fuel and oxygen are increased while maintaining the equivalence ratio below 1 to increase the temperature of the furnace; wherein after a furnace temperature exceeds an auto-ignition temperature of the main fuel, a flow rate of the main fuel is increased to increase the equivalence ratio to greater than 1.

In an example of the disclosure, a heat exchange and flame arrest device for use with a subject gas includes tubing arranged to traverse a core, with the tubing defining a cooling fluid pathway. The core includes a gas flow inlet, a set of cooling fins, and a gas flow outlet. The gas flow inlet, the set of cooling fins, and the gas flow outlet collectively form a gas flow pathway for a subject gas. Each cooling fin of the set is positioned to form a gap between that cooling fin and an adjacent cooling fin. The gas flow inlet is to receive the subject gas. The combination of the gap between each cooling fin of the set and the cooling capacity of the cooling fluid pathway is sufficient to, if the subject gas has ignited, lower temperature of the subject gas to below autoignition temperature.

The present invention discloses a rapid cold-start flameless combustion furnace and a control method, which relate to the technical field of combustion equipment. The rapid cold-start flameless combustion furnace includes a combustion furnace body and an inductive heating component. A combustion chamber is provided inside the combustion furnace body. The combustion chamber is provided with an air jet nozzle, a fuel nozzle and an exhaust gas outlet. The air jet nozzle and the fuel nozzle are oppositely distributed on opposite sides of the combustion chamber and are arranged in an opposite jet. The furnace wall of the combustion chamber is a metal component; the inductive heating component includes an inductive coil spirally wound around the outer periphery of the combustion furnace body, and the area surrounded by the inductive coil corresponds to the combustion chamber. The present invention heats the furnace wall of the combustion chamber, which is a metal component, through the inductive coil, so that the temperature inside the combustion chamber rises rapidly, and the temperature of the furnace wall of the combustion chamber is higher than the autoignition temperature of the fuel, thereby igniting the fuel and realizing the rapid cold start and stable combustion of the flameless combustion furnace.

The invention relates to the technical field of high-pressure piston compressor oil, and in particular to an environmentally friendly high-pressure piston compressor oil and a preparation method thereof. The compressor oil comprises, by weight, 45-65 parts of trimethylolpropane stearate, 30-45 parts of alkylnaphthalene base oil, 1.5-5 parts of antioxidant, 0.1-3 parts of antiwear agent, 0.02-0.1 parts of non-ferrous metal corrosion inhibitor, 1.0-2.0 parts of oil mist inhibitor, 0.01-0.03 parts of defoamer, and 0.01-0.02 parts of demulsifier. The weight ratio of the trimethylolpropane stearate to the alkylnaphthalene base oil is (1-2.5):1. The compressor oil has the characteristics of high flash point, high autoignition temperature, good detergency, high safety, strong lubrication ability, long oil change cycle, user-friendly and environmentally friendly, and can maintain excellent high temperature performance even under high pressure conditions.

The present disclosure provides for improving flame propagation in a combustor, particularly in a combustor for use in a power production system and method. At least one stream being passed into the combustor (e.g., a fuel, an oxidant, a diluent, a coolant, a working fluid, water, or steam) can be independently heated to a temperature that is about the autoignition temperature of the fuel or greater. Further, flame stabilization, including promoting ignition, can be improved as described herein through controlled addition of one or more NOx species into the combustor or combustion chamber.

The invention discloses a fuel cell system of a single-end supply combustor. The fuel cell system comprises a control module, a fuel cell, a first fuel supply device, an air preheater, a flame combustor and a catalytic combustor, the output end of the first fuel supplier is connected with the first input end of the flame burner, the output end of the fuel cell is connected with the second input end of the flame burner, the output end of the flame burner is connected with the input end of the catalytic burner, and the output end of the catalytic burner is connected with the first input end of the air preheater. The second input end of the air preheater is used for inputting air at the room temperature, and the control module is used for controlling the first fuel supplier to provide fuel for the flame burner when the temperature in the flame burner is larger than or equal to the tolerable temperature of the catalytic carrier and smaller than the spontaneous combustion temperature of the fuel, so that the fuel is conveyed to the catalytic burner through the flame burner, and the catalytic burner is used for supplying the fuel to the catalytic carrier. Therefore, the catalytic burner is started successfully, the system is quickly started again, and the downtime is shortened.

An aircraft gas turbine includes a combustor that combusts compressed air and at least one fuel flow from at least one fuel source to generate combustion gases. A fuel supply system is arranged to provide at least one of a first flow of fuel to the combustor via a first fuel supply line and a second flow of a heated fuel to the combustor via a second fuel supply line. A fuel heat exchanger is arranged within the fuel supply system to generate the heated fuel that is heated above an autoignition temperature of the fuel, and a heat source communicates with the fuel heat exchanger for generating the heated fuel.

A firefighter training apparatus is disclosed. The apparatus has an internal space, and the internal space has a ceiling, closed (enclosed) sides, a closed (enclosed) end, and an opening located generally opposite the closed end. The apparatus is operable for use in enabling one or more firefighters to practice and / or learn about confronting a fire (including in particular an indoor fire) with (or at least including) overhead flames. The apparatus also comprises one or more fuel inlets through which combustible fluid fuel can enter the internal space. At least one of the fuel inlets is located such that, when fuel flows to said at least one fuel inlet, fuel enters the internal space through said at least one fuel inlet at or near the closed end of the internal space near the ceiling. The apparatus also has a heat source, which is operable to elevate the ambient temperature, at least in the region of the internal space where fuel enters through the said at least one fuel inlet, to a temperature above the fuel's autoignition temperature, and the apparatus further includes means for enabling an operator to (at least) cause fuel to cease flowing to one or more or all of the fuel inlets.

To improve flame propagation in a combustor, particularly in a combustor for use in a power production system and method.SOLUTION: At least one stream being fed into the combustor (e.g., a fuel, an oxidant, a diluent, a coolant, a working fluid, water, or steam) may be independently heated to a temperature that is about the autoignition temperature of the fuel or higher. Further, flame stabilization, including promoting ignition, may be improved through controlled addition of one or more NOx species into the combustor or combustion chamber.SELECTED DRAWING: Figure 1

For example, an apparatus may be arranged and configured such that a higher auto-ignition temperature fuel may be utilized to purge a fuel delivery system after a gas turbine is shut down due to detected conditions and facilitate faster restart of the turbine. Embodiments may utilize conduits, valves, and control systems to detect fault conditions to ensure shutdown, purge lower auto-ignition temperature fuel through exhaust, and purge using higher auto-ignition temperature fuel to facilitate subsequent restart of the turbine. Embodiments may be configured such that no inert gas purge is required to exhaust and purge the fuel delivery system.

The invention discloses an ignition component, an ignition control method, a cleaning control method, an engine and a vehicle, the ignition component comprises a shell, the shell is provided with a pre-combustion chamber, the inner wall of the pre-combustion chamber is provided with a catalyst layer, and the catalyst layer is used for catalyzing combustion of fuel in the pre-combustion chamber; and the heating device is used for heating the fuel in the pre-combustion chamber. According to the ignition component, the fuel in the pre-combustion chamber is heated through the heating device, the catalyst layer is arranged on the inner wall of the pre-combustion chamber, and the catalyst layer catalyzes combustion of the fuel in the pre-combustion chamber, so that the fuel can be combusted when the heating device heats the fuel to 0.7-0.9 time of the spontaneous combustion temperature of the fuel, and the temperature needed for igniting the fuel is reduced through the catalyst layer; the flame propagation process is shortened, the combustion rate is increased, the jet intensity of airflow ejected from the pre-combustion chamber is enhanced, and the ignition effect of the ignition component is improved.

A lubricating oil composition configured for lubricating an internal combustion engine fueled with an alternative fuel having an auto-ignition temperature greater than about 700K. The lubricating oil composition includes at least a detergent system including at least one overbased metal-containing sulfonate detergent, at least one neutral to low-based metal containing sulfonate detergent, and at least one overbased metal-containing phenate detergent where the metal provided from the overbased sulfonate detergent is correctly balanced relative to the total detergent metal and / or the composition total base number.

A lubricating oil composition configured for lubricating an internal combustion engine fueled with an alternative fuel having an auto-ignition temperature greater than about 700K. The lubricating oil composition includes at least a detergent system including at least one overbased metal-containing sulfonate detergent, at least one neutral to low-based metal containing sulfonate detergent, and at least one overbased metal-containing phenate detergent where the metal provided from the overbased sulfonate detergent is correctly balanced relative to the total detergent metal and / or the composition total base number.