CN111288437A - Multifunctional compact combustion device and combustion method for solid metal powder combustion - Google Patents
Multifunctional compact combustion device and combustion method for solid metal powder combustion Download PDFInfo
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- CN111288437A CN111288437A CN202010209968.0A CN202010209968A CN111288437A CN 111288437 A CN111288437 A CN 111288437A CN 202010209968 A CN202010209968 A CN 202010209968A CN 111288437 A CN111288437 A CN 111288437A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 181
- 239000000843 powder Substances 0.000 title claims abstract description 69
- 239000007787 solid Substances 0.000 title claims abstract description 55
- 239000002184 metal Substances 0.000 title claims abstract description 54
- 238000009841 combustion method Methods 0.000 title claims abstract description 8
- 238000011084 recovery Methods 0.000 claims abstract description 29
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 27
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003546 flue gas Substances 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 239000001257 hydrogen Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 32
- 230000001590 oxidative effect Effects 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000000112 cooling gas Substances 0.000 claims description 5
- 239000002918 waste heat Substances 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 claims description 3
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- 239000003292 glue Substances 0.000 claims 1
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/26—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/20—Non-catalytic reduction devices
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
The invention discloses a multifunctional compact combustion device and a combustion method for solid metal powder combustion, wherein the combustion device comprises a cylinder shell and a cyclone separator which are connected up and down, a combustion chamber, a burner nozzle and a premixing chamber are wrapped in the cylinder shell from top to bottom, and a powder conveying pipeline and the surface of an over-fire air chamber are arranged on the side of the cylinder shell; the combustion chamber is communicated with the premixing chamber up and down through a burner nozzle; tangential feed inlets are arranged on the periphery of the premixing chamber in a tangential circle; the upper surface of the burning head nozzle is provided with a hole, and the burning head nozzle is provided with an igniter; the combustion chamber is communicated with the cyclone separator through a combustion chamber outlet pipeline; the cyclone separator is communicated with the recovery flue; the metal oxide generated after the metal powder is combusted in the combustion device is separated by the cyclone separator and then enters the recovery device, the metal solid oxide in the recovery device is reduced into the metal powder by hydrogen in the reaction container for circular combustion, the water formed by the reaction is used for water cooling of the combustion device, the flue gas generated by the combustion device can be used for utilizing the residual heat of the flue gas, and the problems of slag bonding and dirt sticking of the metal oxide are solved.
Description
Technical Field
The invention relates to the fields of combustion, clean energy utilization and the like, in particular to a multifunctional compact combustion device and a combustion method for solid metal powder combustion.
Background
Energy is an indispensable thing of human society, and it can be used to produce and transport all raw materials and finished products, provide all services, and provide the basis for all economic activities and wealth creation. Currently, the global economy is driven by the international production, trade and consumption of fossil fuels because they are relatively inexpensive, readily available, energy intensive, and low cost.
However, the combustion of fossil hydrocarbon fuels can produce carbon dioxide emissions, resulting in climate change. Limiting the global warming caused by human activities to 2 ℃ requires limiting the consumption of fossil energy, which will also limit our future economic growth, while in order to slow down global climate change, we must achieve zero carbon emissions from energy and transportation systems and move to low carbon or zero carbon society. Low carbon society will need various clean energy solutions to replace the many roles fossil fuels currently play in the global economy.
The metal fuel is clean energy meeting the requirement, and the metal fuel is combusted to generate metal oxide which is usually solid under standard conditions and can be recycled. Meanwhile, the metal fuel can be reduced from the metal oxide product to be clean original fuel to be recycled. The metal fuel is easy to slag on the surface of the combustion device, so that the metal fuel is not popularized and used in a large area all the time.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a multifunctional compact combustion apparatus for solid metal powder combustion and a cyclic combustion method thereof, which can perform multi-stage cooling on the combustion apparatus and multi-stage recycling of solid metal oxides in flue gas, save energy, be clean and efficient, and reduce the problems of slag bonding and fouling of metal oxides to the maximum extent.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a multifunctional compact combustion device for solid metal powder combustion comprises a cylinder shell 3 and a cyclone separator 10 which are connected up and down, wherein a combustion chamber 1, a burner nozzle 12 and a premixing chamber 7 are wrapped in the cylinder shell 3 from top to bottom, and a powder conveying pipeline 2 and an over-fire air chamber surface 14 are arranged on the side; the combustion chamber 1 is communicated with the premixing chamber 7 up and down through a burner nozzle 12; tangential feed inlets are arranged on the periphery of the surface of the premixing chamber 7 in a tangential manner; the upper surface of the burning head nozzle 12 is provided with a hole, and the burning head nozzle 12 is provided with an igniter 5; the combustion chamber 1 is communicated with the cyclone separator 10 through a combustion chamber outlet pipeline 8; the cyclone separator 10 is communicated with a cyclone separator recovery flue 9;
the gas pressure-feeding solid metal powder tangentially enters the premixing chamber 7 through tangential feed inlets arranged at the periphery of the premixing chamber 7 in a tangential mode, and rotates, flows and rises in the premixing chamber 7 to be fully mixed; the direct current primary air-powder mixture is changed into rotational flow primary air-powder mixture, and the rotational flow primary air-powder mixture enters the combustion chamber 1 through the burner nozzle 12, so that smoke gas backflow is generated, and stable combustion is realized.
The lower part of the premixing chamber 7 is provided with a tangential air inlet to enhance gas-solid mixing and facilitate ignition; preventing the deposition of metal powder.
The surface of the combustion chamber 1 is provided with intensive tangential air inlets 4 for introducing oxidizing gas, a layer of stable adherent gas film is generated on the inner surface of the combustion chamber while combustion is enhanced, and the phenomenon that the temperature of the wall surface is higher than the melting point of metal oxide to cause slag bonding and dirt sticking is prevented.
The surface of the combustion chamber 1 is laid with the water-cooled wall 13, the water-cooled wall 13 and the tangential air inlet 4 on the surface of the combustor are arranged in a staggered mode, heat generated by combustion is preferentially utilized, and meanwhile, the wall surface temperature is prevented from being higher than the melting point of metal oxide, so that slag bonding and dirt sticking are avoided.
The burning nozzle 12 is ignited by an igniter 5 to prevent a cooling gas film attached to the wall in the combustion chamber from extinguishing the flame; after ignition, airflow in the combustion chamber rises in a rotating mode, a negative pressure backflow area is formed in the center, and the airflow is blown up after backflow, so that circular combustion is achieved, and complete combustion is guaranteed.
The external of the burning head nozzle 12 is provided with a flaring 6, the flaring 6 is provided with an air inlet to form air classification, which is beneficial to combustion, and the igniter 5 is arranged between the burning head nozzle 12 and the flaring 6.
The outlet pipelines 8 of the combustion chamber are connected with the cyclone separators 10 and are arranged at four corners of the combustion chamber 1, and the directions of adjacent outlet jet flows of the outlet pipelines 8 of the combustion chamber are mutually vertical, so that gas can enter the cyclone separators 10 in a rotating mode.
The outside of a cyclone recovery flue 9 communicated with the cyclone separator is connected with a U-shaped bend, the bottom of the U-shaped bend is communicated with a recovery device at the lower part of the cyclone separator 10 through a recovery pipeline 11, and metal oxides in the flue gas are recovered again.
The surface 14 of the over-fire air chamber is arranged on the periphery of the combustion chamber 1, and the surface 14 of the over-fire air chamber enables the air intake of the premixing chamber and the combustion chamber to be independently regulated and controlled according to requirements, so that graded air distribution is realized, and the combustion efficiency is ensured.
According to the circulating combustion method of the multifunctional compact combustion device for solid metal powder combustion, gas in the powder conveying pipeline 2 is used for conveying solid metal powder to a tangential feeding hole to tangentially enter the premixing chamber 7 for mixing, oxidizing gas in the premixing chamber 7 carries the solid metal powder to rotate and rise for mixing, the solid metal powder rises to a head combustion nozzle 12 in the middle of the premixing chamber 7 and the combustion chamber 1 for ignition, after ignition, flames in a negative pressure area formed in the center of the combustion chamber 1 are mainly distributed on two sides, and the flames are blown up for continuous circulating combustion after backflow when the flames reach the highest point; after the oxidizing gas enters the combustion chamber 1 from the tangential air inlet 4The inner surface of the combustion chamber 1 rotates and flows to form a layer of cooling air film which acts with the water-cooled wall 13 to reduce the temperature of the inner wall surface of the combustion chamber 1 and prevent slag bonding and dirt sticking; the flue gas after combustion carries solid metal oxide and tangentially rotates through outlet pipelines 8 of the combustion chamber at four corners of the combustion chamber 1 to enter a cyclone separator 10, the flue gas flows out of a recovery flue 9 at the upper part of the cyclone separator 10, and a small amount of solid metal oxide carried when flowing through a U-shaped bend enters a lower recovery device of the cyclone separator 10 through a recovery pipeline 11; the solid metal oxide is thrown to the wall surface of the cyclone separator 10 due to centrifugal action, loses tangential velocity and falls down into a recovery device; the metal solid oxide generated in the combustion device 21 is conveyed to the cyclone reactor 16 to react with the introduced reducing agent hydrogen to generate metal powder and water, and the solid metal oxide generated in the combustion device 21 has combustion waste heat to provide reaction heat for the reduction reaction in the cyclone reactor 16. The water generated in the cyclone reactor 16 is used for water cooling of the water cooling wall 13 in the combustion device 21, and the metal powder generated in the cyclone reactor 16 is transported to the powder silo 20 and the gas blown by the blower 19 enters the premixing chamber 7 through the powder conveying pipe 12 in the combustion device 21 to be combusted again. The combustion chamber 1 is used for micro-positive pressure combustion, a pressure detection system 15 is installed for monitoring pressure, and the air inlet pressure is ensured to be larger than the combustion expansion pressure in the combustion chamber 1; flue gas generated by the combustion device 21 is subjected to flue gas waste heat utilization through the heat exchanger 17; the generated water vapor can be used for doing work or directly used for industrial steam, heating, domestic water and power generation; no CO is generated in the process2And SOx harmful gas is generated, and zero emission is really realized.
The invention has the following advantages:
1) the invention realizes the cyclic combustion utilization of the solid metal powder fuel, and does not generate CO in the process2And toxic and harmful gases such as SOx, and the like, and is clean and environment-friendly.
2) The invention realizes the design of the solid metal powder combustion device, is convenient and efficient, and ensures the purity of the collected gas to the maximum extent through multi-stage dust removal.
3) The invention adopts a multi-stage cooling method, and the possibility of slagging contamination is reduced to the maximum extent.
Drawings
FIG. 1 is a schematic view of a multifunctional compact combustion apparatus for solid metal powder combustion.
In fig. 1: 1. a combustion chamber; 2. a powder conveying pipeline; 3. a barrel housing; 4. a tangential air inlet; 5. an igniter; 6. a burner nozzle; 7. a premixing chamber; 8. a combustion chamber outlet conduit; 9. a recovery pipeline; 10. a cyclone separator; 11. a recovery pipeline; 12. flaring; 13. a water cooled wall; 14. the surface of the over-fire air chamber.
FIG. 2 is a flow diagram of a cyclic combustion process.
In fig. 2: 15. a pressure detection system; 16. a cyclone reactor; 17. a heat exchanger; 18. a pump; 19. a fan; 20. a powder bin; 21. a combustion apparatus.
Detailed Description
The structure and operation of the present invention will be further described with reference to the accompanying drawings.
As shown in figure 1, the multifunctional compact combustion device for solid metal powder combustion comprises a cylinder shell 3 and a cyclone separator 10 which are connected up and down, wherein a combustion chamber 1, a burner nozzle 12 and a premixing chamber 7 are wrapped in the cylinder shell 3 from top to bottom, and a powder conveying pipeline 2 and an over-fire air chamber surface 14 are arranged on the side of the cylinder shell; the combustion chamber 1 is communicated with the premixing chamber 7 up and down through a burner nozzle 12; tangential feed inlets are arranged on the periphery of the surface of the premixing chamber 7 in a tangential manner; the upper surface of the burning head nozzle 12 is provided with a hole, and the burning head nozzle 12 is provided with an igniter 5; the combustion chamber 1 is communicated with the cyclone separator 10 through a combustion chamber outlet pipeline 8; the cyclone separator 10 is communicated with a cyclone separator recovery flue 9; the gas pressure-feeding solid metal powder tangentially enters the premixing chamber 7 through tangential feed inlets arranged at the periphery of the premixing chamber 7 in a tangential mode, and rotates, flows and rises in the premixing chamber 7 to be fully mixed; the direct current primary air-powder mixture is changed into rotational flow primary air-powder mixture, and the rotational flow primary air-powder mixture enters the combustion chamber 1 through the burner nozzle 12, so that smoke gas backflow is generated, and stable combustion is realized.
As the preferred embodiment of the invention, the lower part of the premixing chamber 7 is provided with a tangential air inlet to enhance the gas-solid mixing and facilitate ignition; preventing the deposition of metal powder.
As a preferred embodiment of the invention, the surface of the combustion chamber 1 is provided with dense tangential air inlets 4 for introducing oxidizing gas, so that a layer of stable adherent gas film is generated on the inner surface of the combustion chamber while combustion is enhanced, and the phenomenon that the temperature of the wall surface is higher than the melting point of metal oxide to cause slag bonding and dirt sticking is prevented.
As a preferred embodiment of the invention, the surface of the combustion chamber 1 is laid with the water-cooled wall 13, the water-cooled wall 13 and the tangential air inlet 4 on the surface of the combustor are arranged in a staggered manner, so that the heat generated by combustion is preferentially utilized, and meanwhile, the wall surface temperature is prevented from being higher than the melting point of the metal oxide, and slagging and fouling are prevented.
As a preferred embodiment of the invention, the burner nozzle 12 is ignited by the igniter 5, so that the cooling gas film attached to the inner wall of the combustion chamber is prevented from extinguishing the flame; after ignition, airflow in the combustion chamber rises in a rotating mode, a negative pressure backflow area is formed in the center, and the airflow is blown up after backflow, so that circular combustion is achieved, and complete combustion is guaranteed.
As a preferred embodiment of the invention, a flaring 6 is arranged outside the burner nozzle 12, an air inlet is arranged on the flaring 6 to form air classification and facilitate combustion, and the igniter 5 is arranged between the burner nozzle 12 and the flaring 6.
As a preferred embodiment of the invention, the combustion chamber outlet pipelines 8 are connected with the cyclone separators 10 and are arranged at four corners of the combustion chamber 1, and the directions of adjacent outlet jet flows of the combustion chamber outlet pipelines 8 are perpendicular to each other, so that the gas is enabled to rotate to enter the cyclone separators 10.
As a preferred embodiment of the invention, a U-shaped bend is connected to the outside of a cyclone recovery flue 9 communicated with the cyclone, the bottom of the U-shaped bend is communicated with a recovery device at the lower part of the cyclone 10 through a recovery pipeline 11, and metal oxides in flue gas are recovered again.
As a preferred embodiment of the invention, the surface (14) of the over-fire air chamber is arranged around the combustion chamber (1), and the surface (14) of the over-fire air chamber enables the air intake of the premixing chamber and the combustion chamber to be independently regulated and controlled according to requirements, thereby realizing graded air distribution and ensuring the combustion efficiency.
As shown in figure 1, the invention relates to a circulating combustion method of a multifunctional compact combustion device for solid metal powder combustion, gas in a powder conveying pipeline 2 is used for conveying solid metal powder to a tangential feed inlet to tangentially enter a premixing chamber 7 for mixing, oxidizing gas in the premixing chamber 7 carries the solid metal powder to rotate and rise for mixing, the solid metal powder rises to a burner nozzle 12 in the middle of the premixing chamber 7 and a combustion chamber 1 for ignition, after ignition, flames in a negative pressure zone formed in the center of the combustion chamber 1 are mainly distributed on two sides, and the flames are blown up for continuous circulating combustion after the flames reach the highest point. After the oxidizing gas enters the combustion chamber 1 from the tangential air inlet 4, the oxidizing gas rotates and flows on the inner surface of the combustion chamber 1 to form a layer of cooling gas film which acts with the water-cooled wall 13 to reduce the temperature of the inner wall surface of the combustion chamber 1 and prevent slag bonding and dirt sticking. The flue gas after burning carries solid metal oxide and tangentially rotates to enter a cyclone separator 10 through outlet pipelines 8 of the combustion chamber at four corners of the combustion chamber 1, the flue gas flows out of a recovery flue 9 at the upper part of the cyclone separator 10, and a small amount of solid metal oxide carried when flowing through a U-shaped bend enters a recovery device at the lower part of the cyclone separator 10 through a recovery pipeline 11. The solid metal oxides are thrown by centrifugal action against the walls of the cyclone 10 and fall downwardly into the recovery unit losing tangential velocity.
As shown in fig. 2, the metal solid oxide generated in the combustion device 21 is conveyed to the cyclone reactor 16 to react with the introduced reducing agent hydrogen to generate metal powder and water, and the solid metal oxide generated in the combustion device 21 carries residual heat of combustion to provide reaction heat for the reduction reaction in the cyclone reactor 16. The water generated in the cyclone reactor 16 is used for water cooling of the water cooling wall 13 in the combustion device 21, and the gas blown by the fan 19 in the metal powder generated in the reactor 16 is conveyed to the powder bin 20 and enters the premixing chamber 7 through the powder conveying pipe 12 in the combustion device 21 for combustion again. The combustion chamber 1 is used for micro-positive pressure combustion, a pressure detection system 15 is installed for monitoring pressure, and the air inlet pressure is ensured to be larger than the combustion expansion pressure in the combustion chamber 1; flue gas generated by the combustion device 21 is subjected to flue gas waste heat utilization through the heat exchanger 17; the generated water vapor can be used for doing work or directly used for industrial steam, heating, domestic water and power generation; no CO is generated in the process2SOx generation of harmful gasesAnd zero emission is really realized.
Claims (10)
1. A multi-functional compact burner for the combustion of solid metal powders, characterized in that: the cyclone separator comprises a cylinder shell (3) and a cyclone separator (10) which are connected up and down, wherein a combustion chamber (1), a burner nozzle (12) and a premixing chamber (7) are wrapped in the cylinder shell (3) from top to bottom, and a powder conveying pipeline (2) and the surface (14) of an over-fire air chamber are arranged on the side; the combustion chamber (1) is communicated with the premixing chamber (7) up and down through a burner nozzle (12); tangential feed inlets are arranged on the periphery of the premixing chamber (7) in a tangential circle; the upper surface of the burning head nozzle (12) is provided with a hole, and the burning head nozzle (12) is provided with an igniter (5); the combustion chamber (1) is communicated with the cyclone separator (10) through a combustion chamber outlet pipeline (8); the cyclone separator (10) is communicated with the recovery flue (9);
the gas pressure-feeding solid metal powder tangentially enters the premixing chamber (7) from tangential feed inlets which are arranged at the periphery of the premixing chamber (7) in a tangential mode, and rotates, flows and rises in the premixing chamber (7) to be fully mixed; the direct-current primary air-powder mixture is changed into rotational-flow primary air-powder mixture, and the rotational-flow primary air-powder mixture enters the combustion chamber (1) through the burner nozzle (12), so that smoke backflow is generated, and stable combustion is realized.
2. A multifunctional compact combustion device for solid metal powder combustion as claimed in claim 1, characterized in that: the lower part of the premixing chamber (7) is provided with a tangential air inlet to enhance gas-solid mixing and facilitate ignition; preventing the deposition of metal powder.
3. A multifunctional compact combustion device for solid metal powder combustion as claimed in claim 1, characterized in that: the combustion chamber (1) surface is equipped with intensive tangential air intake (4) and is used for letting in oxidizing gas, strengthens burning and simultaneously produces the stable adherence gas film of one deck at the combustion chamber inner surface, prevents that the wall temperature is higher than metal oxide melting point, causes the slagging scorification to glue dirty.
4. A multifunctional compact combustion device for solid metal powder combustion as claimed in claim 3, characterized in that: the surface of the combustion chamber (1) is laid with water-cooled walls (13), the water-cooled walls (13) and tangential air inlets (4) on the surface of the combustor are arranged in a staggered mode, heat generated by combustion is preferentially utilized, and meanwhile, the wall surface temperature is prevented from being higher than the melting point of metal oxides, so that slag bonding and dirt sticking are caused.
5. A multifunctional compact combustion device for solid metal powder combustion as claimed in claim 1, characterized in that: the burning head nozzle (12) is ignited by an igniter (5) to prevent a cooling gas film attached to the wall in the combustion chamber from extinguishing flame; after ignition, airflow in the combustion chamber rises in a rotating mode, a negative pressure backflow area is formed in the center, and the airflow is blown up after backflow, so that circular combustion is achieved, and complete combustion is guaranteed.
6. A multifunctional compact combustion device for solid metal powder combustion as claimed in claim 1, characterized in that: the external of the burning nozzle (12) is provided with a flaring (6), the flaring (6) is provided with an air inlet to form air classification, which is beneficial to combustion, and the igniter (5) is arranged between the burning nozzle (12) and the flaring (6).
7. A multifunctional compact combustion device for solid metal powder combustion as claimed in claim 1, characterized in that: the outlet pipelines (8) of the combustion chamber are connected with the cyclone separators (10) and are arranged at four corners of the combustion chamber (1), and the directions of adjacent outlet jet flows of the outlet pipelines (8) of the combustion chamber are perpendicular to each other, so that gas can enter the cyclone separators (10) in a rotating mode.
8. A multifunctional compact combustion device for solid metal powder combustion as claimed in claim 1, characterized in that: and a U-shaped bend is connected to the outside of a recovery flue (9) communicated with the cyclone separator, the bottom of the U-shaped bend is communicated with a recovery device at the lower part of the cyclone separator (10) through a recovery pipeline (11), and metal oxides in the flue gas are recovered again.
9. A multifunctional compact combustion device for solid metal powder combustion as claimed in claim 1, characterized in that: the surface (14) of the over-fire air chamber is arranged on the periphery of the combustion chamber (1), and the surface (14) of the over-fire air chamber enables the air intake of the premixing chamber and the combustion chamber to be independently regulated and controlled according to requirements, so that graded air distribution is realized, and the combustion efficiency is ensured.
10. The cyclic combustion method of the multifunctional compact combustion apparatus for solid metal powder combustion as set forth in any one of claims 1 to 9, wherein: gas in the powder conveying pipeline (2) is used for conveying solid metal powder to a tangential feeding hole and tangentially enters a premixing chamber (7) for mixing, oxidizing gas in the premixing chamber (7) carries the solid metal powder to rotate and rise for mixing, the solid metal powder rises to a burner nozzle (12) in the middle of the premixing chamber (7) and a combustion chamber (1) for ignition, flames in a negative pressure area formed in the center of the combustion chamber (1) after ignition are mainly distributed on two sides, and the flames are blown up for continuous circulating combustion after backflow when reaching the highest point; after the oxidizing gas enters the combustion chamber (1) from the tangential air inlet (4), the oxidizing gas rotates and flows on the inner surface of the combustion chamber (1) to form a layer of cooling gas film which acts with the water-cooled wall (13) to reduce the temperature of the inner wall surface of the combustion chamber (1) and prevent slag bonding and dirt sticking; the flue gas after combustion carries solid metal oxide and enters a cyclone separator (10) through a combustion chamber outlet pipeline (8) at four corners of a combustion chamber (1) in a tangential rotation mode, the flue gas flows out from a recovery flue (9) at the upper part of the cyclone separator (10), a small amount of solid metal oxide carried when flowing through a U-shaped bend enters a recovery device at the lower part of the cyclone separator (10) through a recovery pipeline (11), the solid metal oxide is thrown to the wall surface of the cyclone separator (10) due to centrifugal action and loses tangential velocity and falls downwards into the recovery device, the metal solid oxide generated in a combustion device (21) is conveyed to a cyclone reactor (16) to react with introduced reducing agent hydrogen to generate metal powder and water, the solid metal oxide generated by the combustion device (21) has combustion waste heat to provide reaction heat for reduction reaction in the cyclone reactor (16), and the water generated in the reactor (16) is used for water cooling a water cooling wall (13) in the combustion device (21) The metal powder generated in the cyclone reactor (16) is sent to a powder bin (20) under pressure, and the gas blown by a fan (19) enters the pre-powder conveying pipeline (2) in a combustion device (21)The mixing chamber (7) is combusted again; the combustion chamber (1) is used for micro-positive pressure combustion, and a pressure detection system (15) is arranged for monitoring pressure to ensure that the air inlet pressure is greater than the combustion expansion pressure in the combustion chamber (1); flue gas generated by the combustion device (21) is subjected to flue gas waste heat utilization through the heat exchanger (17); the generated water vapor is used for doing work or directly used for industrial steam, heating, domestic water and power generation; no CO is generated in the process2And SOx harmful gas is generated, and zero emission is really realized.
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| WO2023080789A1 (en) * | 2021-11-08 | 2023-05-11 | Renewable Iron Fuel Technology B.V. | Iron fuel combustion arrangement |
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