CN211290143U - Plasma coupling oxygen-enriched combustion ignition device - Google Patents
Plasma coupling oxygen-enriched combustion ignition device Download PDFInfo
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- CN211290143U CN211290143U CN201920942122.0U CN201920942122U CN211290143U CN 211290143 U CN211290143 U CN 211290143U CN 201920942122 U CN201920942122 U CN 201920942122U CN 211290143 U CN211290143 U CN 211290143U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a plasma coupling oxygen boosting burning ignition, including positive pole, negative pole, first coil, arc ignition device, oxygen-enriched gas room, the positive pole adjoins the setting with the negative pole, the surface cover of negative pole is equipped with the oxygen-enriched gas room, the cover of first coil part is established on the combustion-supporting gas room, state and be equipped with the oxygen-enriched gas import on the oxygen-enriched gas room in order to provide oxygen-enriched gas, spout in order to ignite after mixing with oxygen-enriched gas through the plasma that the arc ignition device produced. Plasma coupling oxygen boosting burning ignition device introduce the oxygen of high concentration through the oxygen-enriched gas import and make rich oxygen ion in the plasma to make coal fired boiler can burn under low buggy concentration and low air supply temperature, improved the burn-off rate and the flame temperature of buggy, have the advantage of high combustion temperature and high combustion efficiency.
Description
Technical Field
The utility model relates to an ignition equipment, in particular to plasma coupling oxygen boosting burning ignition.
Background
Plasma ignition is a novel boiler start-stop and stable combustion technology, can realize pulverized coal boiler oil-free ignition and low-load stable combustion, saves fuel resources, greatly saves operating cost, and has great economic benefit and social benefit. For the unit equipped with the electric dust collector, because the fuel oil is not used for ignition, the electric dust collector can be put into operation during ignition, and good environmental protection benefits are achieved.
The basic principle of the plasma ignition device is that the high-power electric arc directly ignites the coal powder. The power for the arc was supplied from a 200kW DC power supply cabinet, and the arc was generated between the cathode and the anode. The power of the device is continuously adjustable within 50-150 kW, and the central temperature can reach 6000 ℃. Feeding primary air powder into a plasma ignition device, separating the primary air powder into thick coal powder and making the thick coal powder enter an electric arc core, quickly igniting in about 1/10s, and stably burning; under the support of oxygen amount of enough secondary air, the light coal powder after concentration and dilution separation is subjected to relay combustion by means of the flame of the combusted coal powder, and the combustor sprays coal powder torches into the furnace. Under the condition of reasonable air-powder ratio, the temperature and pressure rising speed of the boiler can be well controlled, and other burners are put into the boiler when the temperature of a hearth reaches a certain temperature, so that the boiler is safely and reliably started. Meanwhile, under the condition of low load of the boiler, the boiler can be put into operation at any time, and a good combustion stabilizing effect is achieved.
However, since air having a certain temperature is required for ignition due to the necessity of combustion, a heating system such as a heater needs to be provided. Moreover, the coal powder burnout rate in the ignition stage is low, and the ignition duration of the plasma generator is relatively long. And plasma ignition relies on high-power electric arc to ignite the pulverized coal, the generation of the electric arc needs to consume a large amount of power, and if oxygen and other combustion-supporting gas can participate, the power consumption of the plasma ignition device of the pulverized coal boiler and the heating energy consumption of a heater can be greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses creatively provides and utilizes oxygen to be the medium, replaces the air among the original plasma ignition device, just so can realize the low temperature air supply ignition technology of the plasma ignition device of low power consumption under the oxygen boosting condition.
In order to solve the technical problem, the utility model discloses a plasma coupling oxygen boosting combustion ignition, including positive pole, negative pole, first coil, arc ignition device, oxygen-enriched gas room, the positive pole adjoins the setting with the negative pole, the surface cover of negative pole is equipped with the oxygen-enriched gas room, the cover of first coil part is established on the combustion-supporting gas room, it is equipped with the oxygen-enriched gas import in order to provide oxygen-enriched gas to state on the oxygen-enriched gas room, and the plasma that produces through the arc ignition device is blowout in order to ignite after mixing with oxygen-enriched gas.
Further, the oxygen content of the oxygen-enriched gas is 80-99.9%.
Still further, a special-shaped discharge cavity is arranged in the anode, and the inlet end of the discharge cavity is communicated with the oxygen-enriched gas chamber.
Furthermore, the discharge cavity is formed by sequentially connecting a first contraction part, a first outward expansion part, a second contraction part and a second outward expansion part, and the inlet end of the first contraction part is connected with the oxygen-enriched gas chamber.
Further, the device still includes the second coil, the periphery at second external expanding portion is established to the second coil cover.
Furthermore, the cathode is provided with a nozzle at one end near the anode, and the nozzle is connected with an arc ignition device to generate an electric arc.
Further, the anode or the cathode is cooled by introducing a circulating cooling medium.
Further, the cooling medium includes any one of cooling water and cooling air.
Furthermore, the cathode is provided with a cooling air inlet and a cooling air outlet which are respectively positioned at the side surface and the lower end part of the cathode; and the anode is provided with a cooling water inlet and a cooling water outlet which are respectively positioned at the upper side and the lower side of the anode.
Further, the oxygen-enriched gas chamber is also provided with a gas inlet, and the gas is any one of natural gas, methane, biomass gas, coal gas, hydrogen and ammonia gas.
The utility model has the advantages that:
(1) the utility model discloses an oxygen that oxygen-enriched gas import introduced high concentration makes rich oxygen ion in the plasma to make coal fired boiler can burn under low buggy concentration and low air supply temperature, improved the burn-off rate and the flame temperature of buggy.
(2) The utility model discloses combine plasma technique and oxygen boosting burning, can reach the advantage of oxygen boosting burning low nitrogen emission, high combustion temperature and high combustion efficiency on the plasma ignition advantage basis that economizes on fuel.
(3) The utility model discloses do not have the requirement to the overgrate air temperature, can reduce the air heater heating energy consumption, energy saving consumes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a plasma coupled oxygen-enriched combustion ignition device according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a plasma coupled oxycombustion ignition device according to embodiment 2;
FIG. 3 is a schematic view of the structure of the anode according to the present invention;
description of the reference numerals
The device comprises an anode-1, a cathode-2, a first coil-3, an arc ignition device-4, an oxygen-enriched gas inlet-5, a fuel gas inlet-6, a discharge cavity-7, a first contraction part-71, a first outward expansion part-72, a second contraction part-73, a second outward expansion part-74, an oxygen-enriched gas chamber-8, a plasma-9, an electric arc-10, a second coil-11, a cooling gas inlet-12, a cooling gas outlet-13, a cooling water inlet-14, a cooling water outlet-15 and a nozzle-16.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
As shown in figure 1, the plasma coupling oxygen-enriched combustion ignition device comprises an anode 1, a cathode 2, a first coil 3, an arc ignition device 4 and an oxygen-enriched gas chamber 8, wherein the anode 1 and the cathode 2 are both tubular and are adjacently arranged. Preferably, the anode 1 and the cathode 2 are coaxially arranged and do not move relatively during operation, and the positive electrode and the negative electrode of the direct current power supply are respectively connected with the anode 1 and the cathode 2. The outer surface of the cathode 2 is provided with the oxygen-enriched gas chamber 8, the first coil 3 is partially sleeved on the oxygen-enriched gas chamber 8, the generated electric arc 10 is pushed into the anode 1 by the force of a magnetic field, the oxygen-enriched gas chamber 8 is provided with an oxygen-enriched gas inlet 5 to provide oxygen-enriched gas, and the plasma 9 generated by the arc ignition device 4 is mixed with the oxygen-enriched gas and then sprayed out to ignite.
The oxygen-enriched gas can be prepared by adopting outsourcing oxygen or a self-arranged oxygen making device, and the oxygen making device is any one of a small pressure swing adsorption oxygen making device or a large-scale deep cooling air separation oxygen making device. As an example of the present invention, the oxygen content of the oxygen-enriched gas is 80% -99.9%. Preferably, the oxygen-enriched gas has an oxygen content of 94-99%.
The anode 1 is a hollow cylinder made of a metal material. Preferably, the anode 1 is made of a copper alloy. The anode 1 is internally provided with a special-shaped discharge cavity 7, and the inlet end of the discharge cavity 7 is communicated with the oxygen-enriched gas chamber 8. The discharge chamber 7 is shaped like a laval nozzle with a convergent-divergent structure followed by a convergent-divergent structure. As shown in fig. 3, the discharge chamber 7 is composed of a first constriction 71, a first outward-expanding portion 72, a second constriction 73, and a second outward-expanding portion 74, which are connected in sequence, and the inlet end of the first constriction 71 is connected to the outlet end of the oxygen-enriched gas chamber 8. The inner tube wall of the discharge cavity 7 is uneven, which is beneficial to ionizing the medium gas flowing through the discharge cavity 7, and the medium gas is ionized and then sprayed out to form plasma flame when flowing through the discharge cavity 7. As an example of the present invention, the anode 1 is further covered with a casing, and the front end of the casing is provided with an opening to fit the discharge chamber 7. Preferably, an anode sealing block is arranged between the outlet end of the discharge cavity 7 and the shell to prevent plasma flame from spraying into the gap of the shell.
As a preferred example of the present invention, the apparatus further includes a second coil 11, and the second coil 11 is sleeved on the periphery of the second expanding portion 74. The second coil 11, in the same principle as the first coil 3, pushes the formed plasma flame out of the discharge chamber 7 by the action of the magnetic field to form a strong flame.
The cathode 2 is provided with a nozzle 16, the nozzle 16 is connected with the arc striking device 4, when the arc striking device 4 sends out a high-frequency and high-voltage signal, an electric arc 10 is generated between the two electrodes, and the electric arc 10 ionizes air to form a plasma 9. Preferably, the arc striking device is a 4-position arc striking motor. The included angle between the axial direction of the nozzle 16 and the gas flow direction of the oxygen-enriched gas chamber 8 at one end of the nozzle 16 is alpha, the value range of the alpha angle is 20-50 degrees, and the alpha angle is set to ensure that the oxygen-enriched gas and the plasma 9 can be fully mixed after being sprayed, so that the formation and the amplification of the flame of the igniter are facilitated, and a better flame structure is obtained. The nozzles 16 are operated to generate high temperatures inside, and thus continuous cooling of the cathode 2 and the anode 1 by circulating cooling media is required. The cooling medium includes any one of cooling water and cooling air. As an example of the present invention, the cathode 2 is provided with a cooling air inlet 12 and a cooling air outlet 13, which are respectively located at the side surface and the lower end of the cathode 2, and cooling is performed by introducing cooling gas into the cathode 2; the anode 1 is provided with a cooling water inlet 14 and a cooling water outlet 15, and the cooling water outlet 15 and the cooling water inlet 14 are respectively positioned at the upper side and the lower side of the anode 1. As a further example of the present invention, the anode 1 and the cathode 2 may be cooled by the same cooling medium.
When the power station boiler is ignited by adopting the device, the oxygen-enriched gas inlet 5 is opened, the electric arc 10 is released through the nozzle 16, the generated electric arc 9 ionizes the air into the plasma 9, and the plasma 9 is mixed with the oxygen-enriched gas, accelerated to be sprayed out under the action of the second coil 11 and is in contact with the pulverized coal for ignition; due to the effect of oxygen enrichment, the ignition heat of the pulverized coal flow is greatly reduced, the combustion speed is accelerated, the combustion temperature is increased, and the pulverized coal flow can be ignited more than the common plasma ignition technology, so that the ignition energy required for igniting the pulverized coal flow is greatly reduced, and the inferior coal can be ignited under the condition of the same plasma ignition energy, so that the purpose of wider coal adaptability of the oxygen enrichment plasma ignition stable combustion technology is realized. If, in the case of coal which is more difficult to ignite, the other ignition processes are not changed, it is conceivable to compress the oxygen-enriched gas. The dissociation heat of oxygen is higher than that of air, the heat carrying performance is better, the heat release amount during particle compounding is larger, and a large amount of reaction heat is provided during oxygen-carbon reaction, so that the plasma ignition temperature with the same power is further increased, and the primary air pulverized coal flow which is rich in oxygen is easier to ignite.
Example 2
As shown in figure 2, the plasma coupling oxygen-enriched combustion ignition device comprises an anode 1, a cathode 2, a first coil 3, an arc ignition device 4 and an oxygen-enriched gas chamber 8, wherein the anode 1 and the cathode 2 are both tubular and are adjacently arranged. Preferably, the anode 1 and the cathode 2 are coaxially arranged and do not move relatively during operation, and the positive electrode and the negative electrode of the direct current power supply are respectively connected with the anode 1 and the cathode 2. The outer surface of the cathode 2 is provided with the oxygen-enriched gas chamber 8, the first coil 3 is partially sleeved on the oxygen-enriched gas chamber 8, the generated electric arc 10 is pushed into the anode 1 by the force of a magnetic field, the oxygen-enriched gas chamber 8 is provided with an oxygen-enriched gas inlet 5 and a fuel gas inlet 6 to respectively provide oxygen-enriched gas and fuel gas, and plasma 9 generated by the arc ignition device 4 is mixed with the oxygen-enriched gas and the fuel gas and then sprayed out to ignite.
The oxygen-enriched gas can be prepared by adopting outsourcing oxygen or a self-arranged oxygen making device, and the oxygen making device is any one of a small pressure swing adsorption oxygen making device or a large-scale deep cooling air separation oxygen making device. As an example of the present invention, the oxygen content of the oxygen-enriched gas is 80% -99.9%. Preferably, the oxygen-enriched gas has an oxygen content of 90-99.9%.
The fuel gas of the fuel gas inlet 6 comprises any one of fuel gas such as natural gas, methane, biomass gas, coal gas, hydrogen, ammonia and the like. Specifically, the fuel gas can be coal gas, biomass gas or garbage combustible gas prepared by pyrolysis of coal, biomass or garbage arranged in a natural gas pipeline or a thermal power plant, or ammonia gas prepared by electrolysis hydrogen production or synthesis with air-separated nitrogen in the thermal power plant, and by arranging the fuel gas inlet 6, the use amount of pulverized coal concentration or pulverized coal can be effectively reduced, the ignition is easier than pure pulverized coal plasma ignition, and the combustion-supporting effect of stable combustion of a boiler is better.
The anode 1 is a hollow cylinder made of a metal material. Preferably, the anode 1 is made of a copper alloy. The anode 1 is internally provided with a special-shaped discharge cavity 7, and the inlet end of the discharge cavity 7 is communicated with the oxygen-enriched gas chamber 8. The discharge chamber 7 is shaped like a laval nozzle with a convergent-divergent structure followed by a convergent-divergent structure. As shown in fig. 3, the discharge chamber 7 is composed of a first constriction 71, a first outward-expanding portion 72, a second constriction 73, and a second outward-expanding portion 74, which are connected in sequence, and the inlet end of the first constriction 71 is connected to the outlet end of the oxygen-enriched gas chamber 8. The inner tube wall of the discharge cavity 7 is uneven, which is beneficial to ionizing the medium gas flowing through the discharge cavity 7, and the medium gas is ionized and then sprayed out to form plasma flame when flowing through the discharge cavity 7. As an example of the present invention, the anode 1 is further covered with a casing, and the front end of the casing is provided with an opening to fit the discharge chamber 7. Preferably, an anode sealing block is arranged between the outlet end of the discharge cavity 7 and the shell to prevent plasma flame from spraying into the gap of the shell.
As a preferred example of the present invention, the apparatus further includes a second coil 11, and the second coil 11 is sleeved on the periphery of the second expanding portion 74. In principle with the first coil 3, the second coil 11 further pushes out the formed plasma flame from the discharge chamber 7 by the action of the magnetic field to form a powerful flame.
A nozzle 16 is arranged on the cathode 2, said nozzle 16 being connected to the arc ignition device 4 for generating the arc 10 to form the plasma 9. The included angle between the axial direction of the nozzle 16 and the airflow direction of the oxygen-enriched gas chamber 8 at one end of the nozzle 16 is alpha, the value range of the alpha angle is 30-45 degrees, and the alpha angle is set to ensure that the oxygen-enriched gas and the plasma 9 can be fully mixed after being sprayed, so that the formation and the amplification of the flame of the igniter are facilitated, and a better flame structure is obtained. The nozzles 16 are operated to generate high temperatures inside, and thus continuous cooling of the cathode 2 and the anode 1 by circulating cooling media is required. The cooling medium includes any one of cooling water and cooling air. As an example of the present invention, the cathode 2 is provided with a cooling air inlet 12 and a cooling air outlet 13, which are respectively located at the side surface and the lower end of the cathode 2, and cooling is performed by introducing cooling gas into the cathode 2; the anode 1 is provided with a cooling water inlet 14 and a cooling water outlet 15, and the cooling water outlet 15 and the cooling water inlet 14 are respectively positioned at the upper side and the lower side of the anode 1. As a further example of the present invention, the anode 1 and the cathode 2 may be cooled by the same cooling medium.
When the power station boiler is ignited by adopting the device, the oxygen-enriched gas inlet 5 and the fuel gas inlet 6 are opened, the electric arc 10 is released through the nozzle 16, the generated electric arc 9 ionizes air into plasma 9, and the plasma 9 is mixed with the oxygen-enriched gas and the fuel gas and then accelerated to be sprayed out under the action of the second coil 11 and is ignited by contacting with the pulverized coal; due to the effect of oxygen enrichment, the ignition heat of the pulverized coal flow is greatly reduced, the combustion speed is greatly accelerated, the combustion temperature is greatly improved, and meanwhile, the pulverized coal flow can be ignited more than the common plasma ignition technology after the fuel gas is mixed, so that the difficulty of igniting the pulverized coal flow is greatly reduced, and the purpose of wider coal type adaptability of the oxygen enrichment plasma ignition stable combustion technology is realized.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a plasma coupling oxygen boosting burning ignition, its characterized in that, includes positive pole (1), negative pole (2), first coil (3), arc ignition device (4), oxygen-enriched gas room (8), positive pole (1) all is the tubulose and adjoins the setting with negative pole (2), positive pole (1) is coaxial setting with negative pole (2), the surface cover of negative pole (2) is equipped with oxygen-enriched gas room (8), the cover of first coil (3) part is established on oxygen-enriched gas room (8), be equipped with oxygen-enriched gas import (5) on oxygen-enriched gas room (8) in order to provide oxygen-enriched gas, spout after mixing with oxygen-enriched gas through plasma (9) that arc ignition device (4) produced with the oxygen-enriched gas and in order to ignite.
2. The plasma-coupled oxycombustion ignition device of claim 1, wherein the oxygen-rich gas has an oxygen content of 80% to 99.9%.
3. A plasma coupled oxygen-enriched combustion ignition device according to claim 1, characterized in that a special-shaped discharge cavity (7) is arranged in the anode (1), and the inlet end of the discharge cavity (7) is communicated with the oxygen-enriched gas chamber (8).
4. A plasma coupled oxycombustion ignition device according to claim 3, characterized in that the discharge chamber (7) is formed by connecting a first constriction (71), a first flaring portion (72), a second constriction (73), a second flaring portion (74) in sequence, the inlet end of the first constriction (71) is connected to the oxygen-enriched gas chamber (8).
5. A plasma coupled oxycombustion ignition device according to claim 1, characterized in that the device further comprises a second coil (11), the second coil (11) is provided around the second flared portion (74).
6. A plasma-coupled oxycombustion ignition device according to claim 1, characterized in that the cathode (2) is provided with a nozzle (16) at an end near the anode (1), the nozzle (16) being connected to the arc ignition device (4) for generating the arc (10).
7. A plasma-coupled oxycombustion ignition device according to claim 1, characterized in that the anode (1) or the cathode (2) is cooled by passing a cooling medium.
8. A plasma coupled oxycombustion ignition device according to claim 7, wherein the cooling medium includes any one of cooling water or cooling air.
9. A plasma coupled oxygen-enriched combustion ignition device according to claim 7, characterized in that the cathode (2) is provided with a cooling air inlet (12) and a cooling air outlet (13) respectively located at the side surface and the lower end part of the cathode (2); the anode (1) is provided with a cooling water inlet (14) and a cooling water outlet (15), and the cooling water inlet (14) and the cooling water outlet (15) are respectively positioned at the upper side and the lower side of the anode (1).
10. The plasma coupling oxygen-enriched combustion ignition device according to claim 1, wherein a fuel gas inlet (6) is arranged on the oxygen-enriched gas chamber (8), and the fuel gas is any one of natural gas, methane, biomass gas, coal gas, hydrogen and ammonia.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920942122.0U CN211290143U (en) | 2019-06-21 | 2019-06-21 | Plasma coupling oxygen-enriched combustion ignition device |
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| CN201920942122.0U CN211290143U (en) | 2019-06-21 | 2019-06-21 | Plasma coupling oxygen-enriched combustion ignition device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115307141A (en) * | 2021-12-08 | 2022-11-08 | 苏州大学 | Method for prolonging length of hydrogen flame in combustor and hydrogen combustor device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115307141A (en) * | 2021-12-08 | 2022-11-08 | 苏州大学 | Method for prolonging length of hydrogen flame in combustor and hydrogen combustor device |
| CN115307141B (en) * | 2021-12-08 | 2024-04-19 | 苏州大学 | Method for prolonging hydrogen flame length in burner and hydrogen burner device |
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