54results about "Combustion using multiple fuels" patented technology

The present invention provides a fuel atomizing nozzle (1) for handling at least two fuels and an atomizing fluid, the fuel atomizing nozzle (1) comprising a solid body (10) having a mainly cylindrical shape around a longitudinal axis (X) defining a first end (11), a second end (12) and a contour surface (16) extending there between connecting the two ends (11, 12), wherein the first end (11) comprises at least one outlet (17), wherein the fuel atomizing nozzle (1) further comprises a fluid compartment (14) being arranged centrally around the longitudinal axis (X) in the solid body (10), at least a first and a second fuel compartment (15a, 15b) being arranged in a radial plane between the fluid compartment (14) and the contour surface (16), the fuel compartments (15a, 15b) having an annular shape, the at least first and second fuel compartments (15a, 15b) being connected to a pre-filling chamber (35) by at least a first and a second fuel channel (25a, 25b), respectively, at least one mixing chamber (40) being arranged between the fluid compartment (14) and the at least one outlet (17), and a fluid channel (24) connecting the at least one mixing chamber (40) and the fluid compartment (14), wherein the pre-filling chamber (35) has an annular shape, and the pre-filling chamber (35) is connected via a pre-filling channel (45) to the at least one mixing chamber (40).

To provide a control method and a control device for a boiler capable of suppressing an air amount of the entire boiler even when using fuel gas of which calorie variation is large and a theoretical air amount changes.SOLUTION: A control method is for a boiler that simultaneously burns a plurality of fuel gases with calories different from each other. The control method for the boiler includes a control step of controlling an air amount to be supplied to each of the fuel gases on the basis of a measurement value of an oxygen concentration in exhaust gas of the boiler and a set value of a predetermined target oxygen concentration. The control step includes a step of increasing the air amount to be supplied to the fuel gas with low calorie when the measurement value is below the set value and reducing the air amount to be supplied to the fuel gas with high calorie when the measurement value exceeds the set value.SELECTED DRAWING: Figure 2

OBJECT To provide a metal heating furnace that burns ammonia while decreasing nitrogen oxides efficiently and a method of burning ammonia in the metal heating furnace. MEANS OF REALIZING THE OBJECT A metal heating furnace 10 includes a burner nozzle 31, plural injection nozzles 41, 42, 43 for ammonia, and a controlling unit 100. The burner nozzle 31 is provided on a furnace wall 11 and emits flame F, which is used to burn ammonia. The injection nozzles 41, 42, 43 for ammonia are provided on a ceiling wall 13 at intervals in a direction in which the flame F extends, and are used to eject ammonia in a direction perpendicular to the flame F. The controlling unit 100 optimizes an amount of ammonia ejected from each of the injection nozzles 41, 42, 43 for ammonia.

To provide an operating method for a heating furnace and the heating furnace using ammonia that can suppress discharge of carbon dioxide as combustion fuel of the heating furnace and capable of reducing amounts of nitrogen oxide and unburned ammonia to be discharged to outside of the heating furnace.SOLUTION: This invention relates to an operating method for a heating furnace. The operating method for the heating furnace includes: a first burner heating step of performing burner heating by using first fuel gas containing ammonia and combustion air in which an air ratio to a theoretical air amount of the first fuel gas is 0.9-1.0; a second burner heating step of performing burner heating by using second fuel gas containing ammonia and combustion air in which an air ratio to a theoretical air amount of the second fuel gas is lower than that to the theoretical air amount of the first fuel gas; and an air injection step of injecting air to mixed exhaust gas of exhaust gas through the first burner heating and exhaust gas through the second burner heating.SELECTED DRAWING: Figure 3

The present invention relates to a method for thermally treating a mineral material in the cement, lime, residue and / or raw material industry for processing mineral raw materials, with ammonia being used as the main fuel, and the main fuel providing more than 50% of the thermal energy generated by combustion.

The fuel preheater 10 comprises a first mixer 1, which is provided in a fuel supply line L1 connected to a combustion unit 100 that burns fuel comprising ammonia, wherein the fuel supply line L1 supplies ammonia to the first mixer 1, the first mixer 1 being connected to an oxidizer supply line L2 which supplies an oxidizer, and mixing the ammonia flowing in the fuel supply line L1 with the oxidizer from the oxidizer supply line L2 to produce a mixed gas, and a reactor 2, which is provided downstream of the first mixer 1 in the fuel supply line L1, wherein the reactor 2 comprises a catalyst which promotes a reaction of the ammonia and which causes an exothermic reaction, wherein the catalyst causes the exothermic reaction with at least a portion of the ammonia in the mixed gas supplied by the first mixer 1, and the Mixed gas heated.

Processes for managing combustion of a fuel gas in the presence of an oxidant supplied to a combustion zone, where the fuel gas undergoes an event that includes a pressure decrease and / or an average molecular weight increase, and where the fuel gas is supplied to the combustion zone via a valve. The process can include (I) detecting the event. Upon detecting the event in step (I), the process can also include (II-a) controlling the fuel gas supplied to the combustion zone by limiting an output of the valve to no more than a predetermined threshold output to prevent excessive fuel gas flooding the combustion zone and / or (II-b) controlling the fuel gas supplied to the combustion zone by adjusting the valve to maintain a pressure of the fuel gas after the valve to no higher than a predetermined threshold pressure to prevent excessive fuel gas flooding the combustion zone.

The present invention provides a multi-fuel combustion fuel supply device equipped with a fuel supply system with a bypass fuel supply pipe, which is capable of easily adjusting the fuel flow rate while maintaining the calorific value ratio of each fuel at a set calorific value ratio for each fuel, and a fuel supply method for the multi-fuel combustion fuel supply device. [Solution] The multi-fuel fuel supply device (30) of the embodiment comprises: a hydrogen supply system (40) that supplies hydrogen gas to a combustion device (200), including a main fuel supply pipe (41) with a flow control valve (45) and a bypass fuel supply pipe (42) that has a flow control valve (46) and is connected to the main fuel supply pipe (41) bypassing the flow control valve (45); a city gas supply system (70) that supplies city gas to the combustion device (200), including a main fuel supply pipe (71) with a flow control valve (75) and a bypass fuel supply pipe (72) that has a flow control valve (76) and is connected to the main fuel supply pipe (71) bypassing the flow control valve (75); and a control device (90) for adjusting the flow rates of the hydrogen gas and the city gas.

The utility model discloses a compact biomass blending combustion system, and relates to the technical field of biomass blending combustion. Comprising a biomass discharging room, a discharging hopper, a bin bottom feeding machine, a large-dip-angle belt conveyor, a weighing belt conveyor, an electric three-way flow dividing device and a control system. The discharge hopper is arranged in the discharge room, and the bin bottom feeder is vertically connected to the lower portion of a discharge port of the discharge hopper; the feeding end of the large-dip-angle belt conveyor is connected with a discharging port of the bin bottom feeding machine, and the weighing belt conveyor is horizontally arranged. The electric three-way flow dividing device comprises a main channel and bypass channels, the inlet end of the main channel is connected with the discharging end of the weighing belt conveyor, and outlets of the two bypass channels extend to the positions above the two bearing faces of the fire coal AB belt conveyor respectively and are located on the downstream of a detection point of a weighing device of the fire coal AB belt conveyor. According to the utility model, the requirements of coal-electricity low-carbon transformation on biomass blending combustion capability, land occupation constraint, control precision, environmental protection property and the like are met.

The invention relates to particular burners, particularly to non-premixed or partially-premixed fuel burners with flexibility to oxygen enrich the burner. Accordingly, said burners may be used in applications that needs operation of a burner in both air-fuel, and / or oxy-fuel and / or air-oxy-fuel mode depending on furnace operation needs. The invention further relates to furnaces including the burners and methods of operating the burners.

The application provides a grain for end-face combustion of a solid-liquid fuel gas generator, which comprises a body; one end of the body is a conical surface structure, and a group of vanes for improving the combustion rate of the grain are arranged in the body; the body and the vanes are made of the same material; and the body is fully nested with combustion medium. The application has simple and reasonable structure, solves the problem that the burning surface shape is difficult to maintain during the end-face combustion of a paraffin-based grain, and meets the supply demand of large-flow rich fuel gas, and is suitable for promotion and application.

The application provides a dual-fuel high-temperature heat source, and belongs to the technical field of heat science. The outside is connected with a low-grade fuel channel and a boiler, and the outside is also connected with an air channel and the boiler through a heat source regenerator; the boiler is also connected with a gas channel and the outside through the heat source regenerator; the outside is also connected with a high-grade fuel channel and a second boiler, and the outside is also connected with an air channel and the second boiler through a second heat source regenerator; the second boiler is also connected with a gas channel and the outside through the second heat source regenerator; the outside is connected with a heated medium channel and the second boiler, and the second boiler is also connected with the outside through a heated medium channel, thereby forming the dual-fuel high-temperature heat source.

OBJECT To provide a metal heating furnace that burns ammonia while decreasing nitrogen oxides efficiently and a method of burning ammonia in the metal heating furnace. MEANS OF REALIZING THE OBJECT A metal heating furnace 10 includes a burner nozzle 31, plural injection nozzles 41, 42, 43 for ammonia, and a controlling unit 100. The burner nozzle 31 is provided on a furnace wall 11 and emits flame F, which is used to burn ammonia. The injection nozzles 41, 42, 43 for ammonia are provided on a ceiling wall 13 at intervals in a direction in which the flame F extends, and are used to eject ammonia in a direction perpendicular to the flame F. The controlling unit 100 optimizes an amount of ammonia ejected from each of the injection nozzles 41, 42, 43 for ammonia.

To suppress CO2 emission.SOLUTION: The steam supplying system 10 includes a hydrogen boiler 20, a first hydrogen supplying apparatus 31 for supplying a first hydrogen H1, a first pressure reduction valve 55 for adjusting a flow-rate F1 of the first hydrogen H1, a second hydrogen supplying apparatus 32 for supplying a second hydrogen H2, and a second pressure reduction valve 65 for adjusting a flow-rate F2 of the second hydrogen H2, wherein a CO2 emission factor C1 of the first hydrogen H1 is smaller than a emission factor of the second hydrogen. H2 CO2 C2, when the required amount Ft of the hydrogen H of the hydrogen boiler 20 is equal to or less than the maximum supply amount of the first hydrogen H1, the first decompression valve 55 adjusts the flow amount F1 of the first hydrogen H1 according to the required amount Ft. In addition, the second pressure reduction valve 65 adjusts the flow amount H2 of the second hydrogen F2 to 0, and when the required amount Ft exceeds the maximum supply amount, the first pressure reduction valve 55 adjusts the flow amount H1 of the first hydrogen F1 to the maximum supply amount, and the second pressure reduction valve 65 adjusts the flow amount H1 of the second hydrogen H2 according to the shortage of the first hydrogen F2 with respect to the required amount Ft.SELECTED DRAWING: Figure 1

The present invention relates to a combustion system using a carbon-free fuel such as hydrogen or ammonia, and more specifically, relates to an ammonia and hydrogen co-combustion system which improves the reactivity of ammonia and reduces nitrogen oxides in the exhaust gas after combustion.

To provide a burner capable of reducing a discharge amount of NOx.SOLUTION: The burner includes a main nozzle, a housing, and an auxiliary nozzle. The main nozzle includes a cylindrical body, a first air flow passage disposed in the cylindrical body so as to include an axis of the cylindrical body, a first fuel flow passage and a second fuel flow passage disposed so as to surround the first air flow passage, a baffle plate provided at a tip end portion of the first air flow passage, a first gas nozzle provided at a tip end portion of the first fuel flow passage, and a second gas nozzle provided at a tip end portion of the second fuel flow passage. The sub-nozzle includes an air port ring attached to an end portion of the housing and a flame stabilizing plate attached to an end portion of the cylindrical body. A space between the air port ring and the flame stabilizing plate communicates with a second air flow path formed between the cylindrical body and the housing, the baffle plate includes a first notch for injecting air from the first air flow path, and the flame stabilizing plate includes a second notch for injecting air from the second air flow path.SELECTED DRAWING: Figure 1

To provide a combustion device, an absorption water cooling / heating machine, and a combustion amount control method, which simultaneously supply fuel of different types to a burner and ensure proper combustion thereof.SOLUTION: A combustion device 70 comprises: a storage unit 63 that stores a first relationship defining a flow rate-related value of air A corresponding to a flow rate-related value of first fuel F1 supplied to a burner 71, and a similar second relationship pertaining to a second fuel F2; and a control unit 61 that controls an air flow rate adjustment mechanism 77 so as to supply, to the burner 71, a supply air flow rate obtained on the basis of a value obtained by summing the flow rate-related values of the air A obtained from the first relationship and the second relationship, respectively. An absorption water cooling / heating machine comprises: the combustion device 70; a regenerator including at least the burner 71 of the combustion device 70; a condenser; and an evaporator. The control unit 61 operates the combustion device 70 with a smaller combustion amount between a combustion amount in the burner 71 for bringing a temperature of a cooling target medium to a target temperature and an upper limit combustion amount for maintaining proper operation of the absorption water cooling / heating machine.SELECTED DRAWING: Figure 1

The invention relates to a method and an apparatus for heating a process fluid with a heater having a burner. The fuel is passed to the combustor and combusted to produce heat. A stream of inert gas is provided to the combustor upstream or downstream or both of the combustor. The flow of the inert gas stream is controlled based on the composition of the fuel, where more inert gas passes downstream of the combustor as the amount of hydrogen in the fuel increases.

A burner for burning a hydrogen-containing fuel is equipped with a burner unit which comprises a fuel feed and a feed for a primary oxidant (oxygen) and which is accommodated in a feed for a secondary oxidant (air). A swirl device whose relative position with respect to the burner unit can be altered is provided in the feed for the secondary oxidant. The relative position of the burner unit and the swirl device may be controlled according to a composition of the fuel, in particular according to the water content thereof and the ratio of primary and secondary oxidant. The burner allows flexible adaptation of the burning to fuels of different composition, even during ongoing operation.

To provide a burner capable of reducing a discharge amount of NOx.SOLUTION: A tubular body, a first fuel flow passage arranged to include an axis of the tubular body, a plurality of second fuel flow passages arranged side by side on a circumference around the axis, an air flow passage arranged to surround the first fuel flow passage, a first gas nozzle, a plurality of second gas nozzles, and a baffle plate, wherein the first gas nozzle includes a plurality of fuel injection holes for injecting fuel gas other than hydrogen gas from the first fuel flow passage, and each of the second gas nozzles includes a hydrogen injection hole for injecting hydrogen gas from each of the second fuel flow passages, the baffle plate includes a plurality of air ports for injecting air from the air flow path, the first gas nozzle and the second gas nozzles are provided so as to protrude from the baffle plate, the air ports are arranged on a circumference around an axis, and axes of the fuel injection holes are inclined so as to be separated from each other toward a tip of the first gas nozzle.SELECTED DRAWING: Figure 1

The present invention relates to particular burners, in particular non-premixed or partially premixed dual fuel burners with flexibility to change the heat input from two fuels. Thus, the combustor may be used in applications requiring the combustor to operate in both a single fuel mode and / or a dual fuel mode according to furnace operating requirements. The invention further relates to a furnace comprising said burner and a method of operating said burner.

To provide a gas mixing system which can properly maintain an air fuel ratio and a calorific value when carrying out multifuel combustion of a main fuel gas and an auxiliary fuel gas with a simple configuration using a control valve.SOLUTION: A gas mixing system 1 includes: a main fuel gas control valve 2; a combustion air control valve 3 which controls a flow rate of combustion air A to be supplied to a device 10 using fuel according to a flow rate controlled by the main fuel gas control valve 2; and an auxiliary fuel gas control valve 4 which controls a flow rate of auxiliary fuel gas F2 mixed in the main fuel gas F1. The gas mixing system 1 further includes: an upper side branch pipe 631 which is connected to an upstream side position of the main fuel gas control valve 2 in a main fuel pipe 61 from a downstream side position of the auxiliary fuel gas control valve 4; a downstream side branch pipe 632 which is connected to a downstream side position of the main fuel gas control valve 2 in the main fuel pipe 61 from the downstream side position of the auxiliary fuel gas control valve 4; and a proportional control valve 5 which controls a flow rate of the auxiliary fuel gas F2 flowing in the downstream side branch pipe 632.SELECTED DRAWING: Figure 1

The present invention relates to a burner capable of burning ammonia together with fuel and suppressing the generation of nitrogen oxides. The burner according to an embodiment may comprise: an ignition pipe accommodating an igniter; multiple ammonia nozzles circumferentially arranged to surround the ignition pipe and spray ammonia; air spray ports arranged to surround the ammonia nozzles and spray primary air; and multiple fuel channels arranged to surround the air spray ports and spray fuel, wherein each of the multiple ammonia nozzles is individually opened or closed so that ammonia is sprayed from the opened ammonia nozzle.

A method for combusting a mixed fuel according to one disclosure comprises: a fuel producing step for producing an ammonia-hydrogen mixed fuel in which an excess amount of hydrogen is mixed compared to ammonia on the basis of volume; and a combustion step for supplying the mixed fuel and oxygen to a combustion catalyst, in which an active material containing palladium is supported on a metal oxide support containing alumina, and combusting the mixed fuel.

To provide a power generation method and power generation equipment that leverage the technology developed in coal thermal power generation to reduce carbon dioxide emissions.SOLUTION: In a combustion chamber 21 of a power generation boiler 2, an inorganic solid fuel and a coal gasification gas as an assistive combustion gas are burnt.SELECTED DRAWING: Figure 3

The present invention relates in particular to a method for heating a steel semi-finished product (9) in a heating furnace (1), wherein the heating furnace comprises at least two consecutive heating sections (10, 20, 30, 40), and the method comprises supplying two respective fuel gas streams (F1, F2, F3, F4) having different Wobbe indices (Wob1, Wob2, Wob3, Wob4) to the two heating sections (10, 20, 30, 40).

To suppress defective fluidization due to agglomeration in a fluid medium forming a fluidized bed in a combustion furnace.SOLUTION: A combustion system using a combustion furnace in which a fluidized layer is formed by a fluidized medium and a fuel is combusted in the fluidized layer includes a fuel supply part for supplying a first fuel containing an alkali metal and a second fuel having a smaller content of the alkali metal than the first fuel to the combustion furnace, a sieve for separating the fluidized medium discharged from the combustion furnace into a fluidized medium having a predetermined particle size value or less and a lump having a particle size value exceeding the predetermined particle size value, a circulation line for returning the fluidized medium having the predetermined particle size value or less to the combustion furnace, a photographing part for photographing the lump and outputting image data of the lump, a determination part for determining a coagulation state of the lump indicated by the image data by using a result of machine learning, a combustion control part for controlling at least one of an amount of the first fuel, a fluidized medium newly supplied to the circulation line, and an amount of the fluidized medium discharged from the circulation line according to a result of the determination part.SELECTED DRAWING: Figure 1

OBJECT To provide an industrial furnace that burns ammonia efficiently while decreasing nitrogen oxides. MEANS OF REALIZING THE OBJECT An industrial furnace 1 burns ammonia using flame F, emitted by a burner 10. Ammonia is supplied to the burner 10 alongside of combustion air and fuel gas. Injection nozzles 21, 22, 23, 24 for ammonia each have a shape of a tube. The injection nozzles 21, 22, 23, 24 for ammonia are provided on a wall surface of a furnace body 2 and pierce the wall surface. The injection nozzles 21, 22, 23, 24 for ammonia each have a top end that protrudes toward the interior of the furnace body 2 from the wall surface. The injection nozzles 21, 22, 23, 24 for ammonia are used to inject ammonia exclusively. In addition, the injection nozzles 21, 22, 23, 24 for ammonia are entirely formed from a catalyst C that decomposes ammonia into hydrogen and nitrogen.