20 results about "Combustion front" patented technology

The application discloses an experimental device for studying gas generation and seepage of an in-situ combustion front of an oil reservoir, comprising a rotating assembly, a combustion assembly, an injection assembly, an observation assembly and a separation and detection assembly, wherein the combustion assembly is arranged on the rotating assembly, the injection assembly is communicated with the combustion assembly, the observation assembly is arranged on the combustion assembly to observe the generation and seepage of the gas of the in-situ combustion front of the oil reservoir, and the separation and detection assembly is connected with the combustion assembly to detect the generated hydrogen. Through the cooperation of the observation assembly and the combustion assembly, the gas seepage condition generated by the oxidative pyrolysis reaction in the combustion assembly can be directly observed by the experimental personnel in the experiment, and the experimental error is avoided, so that the actual engineering condition can be fitted.

The invention belongs to the technical field of combustors, and particularly relates to a front and back wall opposed firing coal-fired boiler system for mixed combustion of ammonia gas, a combustion area and a burnout area are sequentially arranged in a boiler from bottom to top, the combustion area comprises pulverized coal combustion areas and ammonia gas combustion areas which are alternately arranged, and the bottommost layer is the pulverized coal combustion area; the pulverized coal combustion area is a main combustion area, and pulverized coal combustors are arranged on the front wall and the rear wall of the boiler. The ammonia gas combustion area is a high-temperature micro-aerobic area, ammonia guns are arranged on the front wall and the rear wall of the boiler, and ammonia gas sprayed into the ammonia gas combustion area through the ammonia guns is cracked into nitrogen gas and hydrogen gas under the high-temperature anoxic condition; the burnout area is a reduction area, and burnout air nozzles are arranged on the front wall and the rear wall of the boiler. Compared with the prior art, the invention solves the problem of low ammonia blending combustion ratio in the prior art. According to the scheme, the front wall and the rear wall for mixed combustion of the ammonia gas are arranged oppositely, so that the combustion reaction is effectively promoted, NOx emission increase caused by ammonia-doped combustion of the pulverized coal is controlled, and large-proportion mixed combustion of the ammonia gas can be reliably realized.

The present invention discloses a polygeneration system utilizing LNG cold energy and an oxygen-enriched combustion power generation cycle. The Allam cycle power generation subsystem comprises a combustion chamber configured to perform oxygen-enriched combustion of vaporized LNG fuel and oxygen produced as a byproduct of the PEM water electrolysis hydrogen production subsystem. Supercritical CO2 gas (supercritical CO2) serves as the working fluid, driving a turbine to generate electricity. After generating work, the supercritical CO2 gas returns to the combustion front and participates in the cycle, where the combustion increment is captured. The PEM water electrolysis hydrogen production subsystem employs an electrolyzer that electrolyzes water to generate hydrogen and oxygen. The oxygen is supplied to the combustion chamber, and the hydrogen is supplied to the hydrogen liquefaction subsystem. The hydrogen liquefaction subsystem utilizes cold energy from the LNG vaporization process to liquefy hydrogen, which is then collected and stored. The ORC power generation subsystem utilizes the waste heat from the Allam cycle power generation subsystem as a high-temperature heat source and the cold energy from the LNG vaporization process as a low-temperature heat source, generating electricity via an organic Rankine cycle. This system achieves efficient and green cogeneration of at least electricity and liquid hydrogen.

The invention discloses a poly-generation system utilizing LNG (Liquefied Natural Gas) cold energy and oxygen-enriched combustion power generation circulation, which is characterized in that an Alam circulation power generation subsystem is characterized in that a combustion chamber is configured to perform oxygen-enriched combustion on gasified LNG fuel and oxygen by-produced by a PEM water electrolysis hydrogen production subsystem, supercritical # imgabs0 # is used as a working medium to drive a turbine to generate power, and the power returns to a combustion front end to participate in circulation after doing work; the combustion increment is captured; according to the PEM water electrolysis hydrogen production subsystem, water is electrolyzed through an electrolytic tank to generate hydrogen and oxygen, the oxygen is supplied to a combustion chamber, and the hydrogen is supplied to the hydrogen liquefaction subsystem; the hydrogen liquefaction subsystem is used for liquefying hydrogen by utilizing cold energy in the LNG gasification process and collecting and storing the liquefied hydrogen; according to the ORC power generation subsystem, combustion waste heat of the Allam cycle power generation subsystem is used as a high-temperature heat source, cold energy in the LNG gasification process is used as a low-temperature heat source, and power is generated through organic Rankine cycle. And efficient and green co-production of electric energy and liquid hydrogen is at least achieved.

The invention discloses a thickened oil development method for breaking through a fireflooding interlayer based on a combustion improver with stratum adsorbability. Selecting a heavy oil reservoir, identifying and confirming a low-permeability interlayer area, and delimiting a target injection area and an injection well group; injecting a combustion improver composition with stratum adsorbability into the interlayer area, and after adsorption is completed, implementing front air pre-injection to activate and catalyze the oxidation capacity of the combustion improver; an ignition agent is continuously injected through the gas injection well to initiate an in-situ combustion reaction; gas injection is maintained, parameters such as combustion temperature and product components are monitored, and stable propulsion of the combustion front edge is controlled. The combustion improver composition comprises an oxidant, a combustion improver, an inorganic catalyst, a catalyst with stratum adsorbability, an emulsifier / surfactant, a polymer adsorbent, a solvent and a pH regulator. The stratum adsorbability of the combustion improver is improved, the combustion improver is enriched at the adsorption site of the interlayer part, high-temperature and high-pressure reaction is generated after ignition, the interlayer structure is broken through, and heat channel breaking through and stable combustion wave propelling are achieved.

The invention relates to the technical field of oxygen-enriched combustion optimization, in particular to an energy-saving optimization control method based on sintering igniter oxygen-enriched combustion. According to the method, the distribution standard deviation of the charge level temperature is calculated based on the charge level temperature field image to represent the combustion uniformity, the temperature gradient is analyzed in the material flow direction to obtain the combustion front edge thickness, and real-time quantification of the combustion uniformity and the combustion front edge thickness in the sintering ignition process is achieved. Only when the distribution standard deviation and the combustion front edge thickness respectively fall into a reference distribution interval and a reference thickness interval determined based on historical data, oxygen flow adjustment is triggered, so that the oxygen-enriched mixing proportion can adapt to working condition fluctuation caused by changes of raw material components, machine speed and material layer thickness; and local under-burning or over-burning caused by insufficient or excessive oxygen enrichment is reduced.

This application discloses a heating furnace device for improving thermal efficiency, including a furnace body and a burner disposed within the furnace body. The burner adopts a staged combustion structure and includes a primary air channel for supplying primary air, wherein the primary air and fuel are mixed in the burner head for initial combustion; and a secondary air channel for supplying secondary air. This application effectively controls the air supply ratio at different stages by dividing the combustion process into multiple stages, avoiding excessively high initial temperatures, suppressing NOx formation, and promoting complete fuel combustion. The internal flue gas recirculation structure uses a flow guiding device to guide some of the high-temperature flue gas back to the combustion front end, which not only increases the temperature of the combustion initiation zone and enhances ignition and stability, but also suppresses further NOx formation by diluting the oxygen concentration. The cyclone separator and the nozzle with swirl vanes work together to improve the uniformity of fuel-air mixing and prevent local rich or lean combustion.

A low NOx combustion device for a belt roaster belongs to the field of combustion technology. The combustion device includes a heat recovery air main pipe, a belt roaster upper cover, a downcomer, a combustion chamber, a combustion pre-chamber and a burner; the downcomer is located on both sides of the lower part of the heat recovery air main pipe and is connected to the combustion chamber; the burner is installed on the side of the combustion pre-chamber. The combustion-supporting air passes through the burner and performs a rich-fuel reducing combustion in the combustion pre-chamber together with the fuel, thereby suppressing the formation of NOx during the combustion process; the fuel that is not completely burned in the combustion chamber and the primary air in the heat recovery air main pipe introduced through the downcomer are further burned in the combustion chamber and the belt roaster upper cover, thereby achieving the purpose of reducing the amount of NOx generated. The advantage is that the combustion-supporting air and the primary air are supplied in stages by setting the combustion pre-chamber, thereby reducing the amount of NOx generated, and the investment is low.

This invention belongs to the field of iron ore sintering technology and discloses a collaborative optimization system and method for iron ore sintering based on active intelligent control of combustion front morphology. The system includes a physical sintering unit, a multimodal sensing network, an intelligent decision-making and control platform, and a multi-field collaborative execution mechanism, forming a closed loop of "perception-decision-execution-learning". The method includes: synchronously collecting multidimensional data inside the sintering bed; updating the state and predicting the combustion front morphology and pollutant generation trend through a digital twin model of mechanism-data fusion; generating an optimal composite control instruction set by using a generative multi-objective optimization decision engine combined with process constraints; coordinating the execution of instructions by adjusting the two-dimensional gradient negative pressure field and the three-dimensional coordinate precise injection; and realizing model self-learning and continuous system optimization based on feedback data. This invention realizes real-time analysis, prediction, and active control of combustion front morphology, and can collaboratively optimize sinter quality, energy efficiency, and pollutant emission reduction.

The application discloses a kind of based on rich hydrogen gas injection's ultra-low carbon sintering method, this method is in the iron ore sintering process, the sintering material surface from ignition heat preservation end to sintering end range is divided into N injection regions, corresponding sintering material surface is injected according to injection concentration Dt=D max *│sint│Injection hydrogen-containing gas.The method periodically and regionally changes the injection concentration of rich hydrogen gas according to the change of sintering time, which can provide sufficient heat for the sintering material layer while facilitating the gradual movement of the gas combustion front to the lower material layer, achieving uniform sintering of the overall material into blocks, and can replace solid carbon-based fossil fuel sintering at a high proportion or even completely, efficiently reducing the emission of COx, SOx and NOx.

The invention relates to an optical fiber Raman scattering sensing system for coal underground gasification temperature distribution monitoring, and the system comprises a distributed optical fiber temperature sensing host which is used for transmitting a laser pulse, enabling the laser pulse to generate Raman scattering with optical cable molecules in the transmission process of a temperature sensing optical cable, generating a Raman scattering signal, calculating a light intensity ratio, and transmitting the light intensity ratio to the optical cable molecules; obtaining temperature distribution along an optical cable path; and the data processing module is used for performing spatial interpolation, time sequence analysis and temperature gradient calculation on the received temperature distribution data, identifying a high-temperature region and a temperature sudden change point, and judging a combustion front position and an expansion speed in real time in combination with a coal seam geologic model and a gasification propulsion direction. The sensor has the advantages of intrinsic safety, electromagnetic interference resistance, corrosion resistance, capability of realizing kilometer-level continuous distributed temperature measurement and the like, and is particularly suitable for complex and severe environments such as underground coal mines and the like. Raman scattering signals are sensitive to temperature but not sensitive to strain, so that the method is very suitable for temperature monitoring of underground coal seam combustion areas.

The application provides a method for determining liquid production decline time and combustion front position in a straight well plane fire flooding process. The method for determining liquid production decline time comprises: fitting a first model and a second model based on liquid production data of a target production well in the last M months and the last N months from the ignition time of a gas injection well, respectively, wherein y is cumulative liquid production, and x is cumulative liquid production time; determining the liquid production decline time of the target production well based on the difference between p m , p n and the shape of the second model. The method for determining the combustion front position comprises: fitting a third model based on cumulative liquid production data of the target production well from the ignition time of the gas injection well; determining the cumulative liquid production corresponding to the target cumulative liquid production time of the target production well by using the third model; determining the average propagation speed of the fire line in the direction from the gas injection well to the target production well within the target cumulative liquid production time; and determining the combustion front position of the fire line in the direction from the gas injection well to the target production well at the target cumulative liquid production time.

A burner element 5 for treating an effluent gas stream from a manufacturing process tool has a porous sleeve 6 at least partially defining a treatment chamber 7, and in use the porous sleeve allows a first gaseous composition G1 to pass through towards the treatment chamber. An array of inlets 9 are arranged about and embedded in the porous sleeve, and in use each inlet injects a second gaseous composition G2 towards the treatment chamber. The inlets can be connected to a manifold 11. Upon entering the treatment chamber the mixture of the first gaseous composition and the second gaseous composition is ignited and forms a combustion front 12 adjacent an internal surface 8 the porous sleeve. The combustion front may be within a compositional gradient between the first and second gaseous compositions at an equilibrium position where the shear mixing (i.e. fuel gas composition), burning velocity, and gas flow rate characteristics are balanced to support the combustion front. Accordingly, this may result in a stable high-temperature combustion front of peaks and troughs. The arrangement is used in an abatement apparatus for treating the effluent gas stream from, for example, a semiconductor or flat panel display manufacturing process tool.

The present invention provides a method and system for monitoring the fire drive combustion front in heavy oil reservoirs based on satellite remote sensing technology. The method comprises: determining the nighttime surface temperature data of a study area based on thermal infrared remote sensing images, and then determining the surface temperature gradient raster data of the study area; using the surface temperature gradient raster data to determine the planar distribution of the burned area, fire wall, coking zone, oil wall, and residual oil area, and thus determining the horizontal distribution data of the fire drive combustion front; determining the vertical depth of the burned area, fire wall, coking zone, oil wall, and residual oil area based on the surface temperature gradient raster data combined with observation well temperature curve data, and thus determining the vertical distribution data of the fire drive combustion front; performing reservoir temperature fitting interpolation based on the horizontal and vertical distribution data of the fire drive combustion front to obtain three-dimensional distribution data of the fire drive combustion front; and predicting the evolution process of the fire drive combustion front based on the horizontal, vertical, and three-dimensional distribution data of the fire drive combustion front at different times.

The invention discloses an iron ore ultralow-temperature sintering method by adding a prefabricated flux, which comprises the following steps: blending raw materials such as blended ore, the prefabricated flux, quicklime, biomass fuel, coke powder and return mine, and then carrying out the procedures of blending, granulating, igniting, sintering, cooling sintered ore, crushing, screening, detecting and the like to obtain a finished product sintered ore. According to the technology, the liquid phase forming temperature in the sintering process can be reduced, the liquid phase composition and generation capacity can be improved, meanwhile, mismatching of the heat transfer front edge speed and the combustion front edge speed is avoided, the problem that the sintering speed is greatly reduced due to increase of the liquid phase amount is effectively solved, and rapid forming of the low-melting-point liquid phase and complete replacement of biomass fuel are promoted. According to the method, the temperature limitation of the existing sintering technology is broken through, the defect of low replacement proportion of biomass fuel is overcome, and the carbon emission in the sintering process is remarkably reduced on the premise of ensuring that the quality index of the sintered mineral product is improved at the same time.

The invention discloses a flame three-dimensional combustion frontal surface reconstruction method based on a chromatographic technology and light field imaging, and belongs to the technical field of combustion detection. The problems that an existing flame frontal surface reconstruction method is complex in system, low in reconstruction precision and large in calculation amount are solved. According to the invention, light field imaging, ultraviolet high-sensitivity detection and an advanced calculation reconstruction algorithm are creatively fused, so that a major breakthrough of a traditional three-dimensional combustion reconstruction technology is realized. The method is mainly used for reconstructing the relative intensity distribution of the flame three-dimensional combustion frontal surface.

The invention belongs to the technical field of heavy oil development, and discloses a combustion front identification method based on multi-source data, a medium and equipment. The method comprises the following steps: collecting various data sources; performing data processing and screening feature data; based on a deep neural network technology, a one-dimensional combustion pipe prediction model, a resistivity sub-prediction model and a pH value regression sub-prediction model are respectively constructed, characteristic weighting is performed on combustion front edge prediction results of the sub-prediction models, and a combustion front edge position prediction model under multi-factor coupling is constructed. Training and optimizing the combustion front position prediction model; and the trained and optimized combustion front edge position prediction model is used for actual production, and the fireflooding combustion front edge position is predicted. According to the combustion front position prediction model, multi-source data information is comprehensively considered, real-time monitoring and accurate prediction of the combustion front position can be achieved, the fireflooding oil extraction efficiency is improved, the exploitation cost is reduced, and technical support is provided for oilfield exploitation.

The present application relates to the field of industrial furnace thermal regulation, and discloses a kind of manheim furnace combustion intensification process for reducing furnace temperature fluctuation, comprising: collecting real-time temperature of burner outlet flame root section and calculating the temperature time change rate, keeping the total flow of fuel and combustion air constant when the change rate exceeds the deviation threshold, reconstructing the momentum distribution ratio of airflow by adjusting the primary air speed and increasing the secondary air speed, using shear force to drive the interface of airflow to transition to parallel sliding state to form a aerodynamic force shield layer, and adjusting the negative pressure of the back of the furnace to assist the axial displacement of the combustion front, the present application reduces the transient thermal disturbance generated by reconstructing the heat release distribution of the combustion space during the adjustment process, solves the technical problem of local heat flux peak exceeding the conduction limit of the muffle furnace wall, suppresses the furnace temperature fluctuation and reduces the thermal stress damage of the furnace body, ensures the uniform heating of the muffle furnace, and improves the thermal robustness of the production process.

The invention relates to a system for delivering and mixing fuel in a combustion chamber of a gas turbine engine. An injection nozzle assembly for a combustion chamber comprises a minimum of three high-pressure injection nozzles with a continuous spray angle for injecting liquid fuel into a hot chamber via special ports, wherein the outside of an injection nozzle housing and of the hot chamber are blown with a cooling airflow. The mixing of fuel and air takes place only in the inner part of the hot chamber and the quality and intensity of the mixing process is regulated by air delivery ports in the front part of the hot chamber. Adjusting the total area of the ports in the front part of the hot chamber, the angle of inclination of the ports in relation to the axis of the spray angle of the injection nozzles, and the diameter of the ports makes it possible to increase the intensity with which the fuel is mixed with oxidizer, shift the combustion front along the axis of the hot chamber, and control the shape of the fuel combustion flame. The invention makes it possible to increase the lifespan of the fuel injection nozzles and to control the fuel combustion region inside the hot chamber.