14 results about "Back-fire" patented technology

To prevent back fire more reliably over a longer period of time.SOLUTION: A combustion device 1 comprises a combustion chamber 10 that combusts mixed gas 73 obtained by mixing air 71 and fuel 72, and a fuel nozzle 20 that forms a flow path for supplying the mixed gas 73 to the combustion chamber 10. The fuel nozzle 20 comprises a swirl blade 30 provided in the flow path. The swirler 30 has a first shape in the flow path at a first temperature, and at a second temperature higher than the first temperature, based on the principle of thermal expansion, forms a second shape in the flow path through which the mixed gas flows more easily than in the first shape.SELECTED DRAWING: Figure 2

The invention includes an air mover device used for fire mitigation and protection. The core component is an air mover unit whose discharge airstream can be positioned using air rudders and / or a directional control assembly to provide air flows in optimum directions and capacity to counter unwanted fire progression or to promote fires in cases of back-burns. Additional support components include a power supply, its fuel source, a speed control mechanism for the air mover, an air mover inlet protective screen, a sparger unit to impart suppressant or retardant into the airstream, balancing feet, a removable nozzle, and instrumentation and controls to ensure function and safety of equipment and personnel. This device can be on a static or mobile platform, towed or self-propelled and can be locally or remotely controlled.

The application discloses a kind of boiler water-cooled wall three-dimensional wall temperature coupling calculation methods, belong to boiler hydrodynamic calculation field, it is by constructing boiler and water-cooled wall model, carries out full furnace combustion numerical simulation and exports the heat flux density distribution of furnace water-cooled wall, convective heat transfer coefficient and working medium temperature;Again by for each calculation module design wall surface temperature distribution calculation method, can accurately calculate to obtain the water-cooled wall circumferential temperature field in calculation module, determine the water-cooled wall of calculation region and fire side temperature, back fire side temperature and pipe inner wall temperature, complete the calculation of water-cooled wall three-dimensional wall temperature.The boiler water-cooled wall three-dimensional wall temperature coupling calculation method in the application, its steps are simple, convenient to calculate, can accurately obtain the detailed distribution of water-cooled wall pipe wall temperature of boiler under different loads and water-cooled wall pipe circumferential temperature distribution, realize the accurate prediction of boiler heating surface wall temperature, provide basis for the optimization of heating surface, and provide guarantee for the safe operation of boiler.

The application discloses a kind of sealing high temperature sealing performance attenuation degree evaluation device and method, belong to composite material quality evaluation, high temperature sealing field, the device includes upper pressure head, lower fixture, force sensor, flame gun, baffle and thermocouple;The steps of the method include installing seal, using flame gun to make seal sample burn, establish the functional relationship between seal compression force and back fire side temperature, establish the correlation model between seal structure-compression force-high temperature sealing performance in the whole combustion process, to quantitatively evaluate the attenuation degree of sealing performance of seal.The application can more truly simulate the actual service condition of seal by in-situ experiment in actual high temperature, pressure head compression, pressure difference environment, accurately reflect the sealing performance attenuation condition of seal under high temperature condition, overcome the deficiency that actual service condition cannot be simulated in prior art.

A method (100) of control for preventing backfire of a fuel in internal combustion engines equipped with at least one injector per engine cylinder, the method comprising the following steps: - calculating the limits of a fuel injection as a function of the valve opening, limits within which backfire is prevented, - calculating the opening delay (OD) and the closing delay (CD) of an injector with respect to the electrical injection command signal, - correcting the electrical injection command signal in terms of advance and duration, - performing a redundant control of the end of injection in terms of electrical injection command signal.

The invention relates to the technical field of fire-fighting equipment, and provides a suspension type dry powder fire extinguishing device and a fire extinguishing method.The suspension type dry powder fire extinguishing device comprises a pressure-resistant container, an ignition mechanism, a first valve, a controller and a detector, and a containing cavity used for storing fire extinguishing dry powder is formed in the pressure-resistant container; a storage device for supplementing fire extinguishing dry powder is arranged on the pressure-resistant container; the plurality of ignition mechanisms are arranged at the top of the pressure-resistant container and are used for spraying the fire extinguishing dry powder in the accommodating cavity out of the pressure-resistant container after the ignition mechanisms are ignited; the first valve is arranged on the output pipe of the pressure container; the controller is electrically connected with the ignition mechanism and the first valve; the detector is used for feeding back fire extinguishing information to the controller and starting the ignition mechanism. The ignition mechanisms can be started at equal time intervals through the controller, and the effect of sequential ignition is achieved; or, the ignition mechanism can be started in order through continuous detection of the detector, so that continuous spraying of the fire extinguishing dry powder and high fire source restraining capacity are kept.

To provide an engine device that can predict abnormal combustion before occurrence thereof by grasping a combustion state of an engine, and a control method for the engine device.SOLUTION: An engine device 1 driven by gas fuel detects a combustion period in a combustion chamber 12a of an engine 2, estimates abnormal combustion that occurs in the combustion chamber 12a on the basis of a correlation between the combustion period and the abnormal combustion (backfire), and when estimating the abnormal combustion, determines a suppression method for suppressing the abnormal combustion. As the suppression method, the engine device 1 performs control for shortening the combustion period.SELECTED DRAWING: Figure 1

The invention discloses a device and method for evaluating the high-temperature sealing performance attenuation degree of a sealing element, and belongs to the field of composite material quality evaluation and high-temperature sealing. The device comprises an upper pressure head, a lower clamp, a force sensor, a flame gun, a baffle and a thermocouple; the method comprises the following steps: installing the sealing element, combusting a sealing element sample by using a flame gun, establishing a function relationship between the compression force of the sealing element and the temperature of the back fire side, and establishing a correlation model among the structure, the compression force and the high-temperature sealing performance of the sealing element in the whole combustion process, so as to quantitatively evaluate the attenuation degree of the sealing performance of the sealing element. According to the invention, the in-situ experiment is carried out under the actual high-temperature, pressure head compression and pressure difference environments, so that the actual service condition of the sealing element can be simulated more truly, the sealing performance attenuation condition of the sealing element under the high-temperature condition is accurately reflected, and the defect that the actual service condition cannot be simulated in the prior art is overcome.

The invention relates to the technical field of temperature measuring equipment, in particular to a monitoring device for a wall temperature measuring point of a fire-back surface of a water-cooled wall, which comprises a supporting sheet fixedly connected with a fire-back surface of a water-cooled wall tube, a blocking block fixedly penetrates through the supporting sheet, a temperature measuring element is fixedly arranged on the rear side wall of the supporting sheet, a shape memory alloy strip is fixedly arranged on the blocking block, and the shape memory alloy strip is fixedly connected with the water-cooled wall tube. A heat conduction copper sheet is fixedly arranged on the outer side wall of the shape memory alloy strip, and the shape memory alloy strip comprises a temperature transfer strip which fixedly penetrates through the plug block in the front-back direction, two forked strips which are integrally formed with the temperature transfer strip and extend towards the left side and the right side along the front side wall of the plug block respectively, and a special-shaped strip which deforms after being heated by steam and is attached to the inner wall of the water wall tube. The temperature of the heat conduction copper sheet is measured through the temperature measuring element, the fire facing surface temperature distribution of the water cooling wall tube can be indirectly calculated, and a basis is provided for boiler operation state evaluation; and when the shape memory alloy strip recovers the shape, the heat conduction copper sheet can be driven to recover and fit the inner wall of the water-cooled wall.

The invention provides an engine device and a control method thereof, which can grasp the combustion state of an engine and predict abnormal combustion before the abnormal combustion occurs. An engine device (1) driven by gaseous fuel detects a combustion period in a combustion chamber (12a) of an engine (2), estimates abnormal combustion occurring in the combustion chamber (12a) on the basis of the correlation between the combustion period and abnormal combustion (backfire), and determines a suppression method for suppressing abnormal combustion when the abnormal combustion is estimated. As a suppression method, the engine device (1) performs control for shortening the combustion period.

To enable back fire to be detected more appropriately in a combustion device.SOLUTION: A detection device 10 for detecting back fire in a combustion chamber 31 that combusts fuel supplied from a supply port, comprises: a conduit pipe 11 connected to the inside of the combustion chamber 31 via an opening part 111 provided in a side wall of the combustion chamber 31; a sensor unit 21 that measures a physical quantity inside the combustion chamber 31 via the conduit pipe 11; and a detection unit 22 that detects back fire in the combustion chamber 31 based on a measurement value of the physical quantity measured by the sensor unit 21. The conduit pipe 11 comprises an opening / closing unit 14 capable of opening and closing the internal space between the combustion chamber 31 and the sensor unit 21.SELECTED DRAWING: Figure 1

To provide an internal combustion engine capable of suppressing generation of back fire.SOLUTION: A first injection valve injects ammonia into an intake path. A second injection valve injects hydrogen into the intake path. A control device causes the first injection valve to inject the ammonia in a first injection period and the second injection valve to inject the hydrogen in a second injection period. At least a part of the second injection period overlaps with the first injection period. A second start time at which the second injection period begins is after the first start time at which the first injection period begins, and / or a second end time at which the second injection period ends is before the first end time at which the first injection period ends.SELECTED DRAWING: Figure 3

1. The name of the design product: the furnace mouth wind cover. 2. The use of the design product: installed on the furnace mouth of the boiler, used for conveying oxygen in the boiler and preventing back smoke and back fire. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

[Problem] To provide an engine system that efficiently discharges blow-by gas from a crank chamber with ease, and that is capable of providing a further backfire countermeasure. [Solution] An engine system in which blow-by gas with a specific gravity less than 1 with reference to air is generatable includes a cylinder block 5. The cylinder block 5 includes a cylinder 51 and a crank chamber 52 which are arranged in an up / down direction D2, the crank chamber 52 being positioned below the cylinder 51. An internal peripheral face 501 of the cylinder block 5 has a ventilation port 502 that connects to a ventilation passage 503 that connects an internal space Sp1 of the crank chamber 52 with an external space out of the cylinder block 5, and that is open. The ventilation port 502 is placed above a center C1 in the up / down direction D2 in the crank chamber 52.