CN111676064A - Coal gasification burner and gasification furnace thereof - Google Patents
Coal gasification burner and gasification furnace thereof Download PDFInfo
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- CN111676064A CN111676064A CN202010493189.8A CN202010493189A CN111676064A CN 111676064 A CN111676064 A CN 111676064A CN 202010493189 A CN202010493189 A CN 202010493189A CN 111676064 A CN111676064 A CN 111676064A
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- 239000003245 coal Substances 0.000 title claims abstract description 158
- 238000002309 gasification Methods 0.000 title claims abstract description 67
- 239000002002 slurry Substances 0.000 claims abstract description 124
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 124
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 114
- 239000001301 oxygen Substances 0.000 claims abstract description 114
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 114
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 239000000498 cooling water Substances 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 16
- 230000002035 prolonged effect Effects 0.000 abstract description 11
- 238000000889 atomisation Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 238000010008 shearing Methods 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 77
- 230000000694 effects Effects 0.000 description 16
- 238000002156 mixing Methods 0.000 description 11
- 239000003250 coal slurry Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2200/00—Details of gasification apparatus
- C10J2200/15—Details of feeding means
- C10J2200/152—Nozzles or lances for introducing gas, liquids or suspensions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
Abstract
The invention discloses a coal gasification burner and a gasification furnace thereof, wherein the coal gasification burner comprises: the inner layer oxygen pipeline, the first pipeline, the second pipeline, the third pipeline and the cooling pipeline. The first pipeline is sleeved on the inner layer oxygen pipeline and forms an inner layer coal water slurry channel with the outer wall of the inner layer oxygen pipeline. The second pipeline is sleeved on the first pipeline and forms an outer-layer oxygen channel with the outer wall of the first pipeline. The third pipeline is sleeved on the second pipeline and forms an outer layer coal water slurry channel with the outer wall of the second pipeline. The cooling pipeline is arranged on the outer wall of the third pipeline. The outer layer of the coal water slurry maintains the shearing direction angle of the outer layer of the oxygen, and the atomization capability of the inner layer of the coal water slurry is enhanced. The cracking of the burner caused by a great deal of heat released by further burning of oxygen and reducing gas is avoided; the corrosion of the reducing gas to the end part of the burner is reduced, and the service life of the burner is prolonged. And a part of the coal water slurry is distributed into the outer layer coal water slurry channel, so that the flow velocity of the inner layer coal water slurry pipeline is reduced, and the abrasion of the coal water slurry to the inner layer coal water slurry channel is reduced.
Description
Technical Field
The invention relates to the technical field of coal chemical industry, in particular to a coal gasification burner and a gasification furnace thereof.
Background
At present, the coal gasification technology is one of the main approaches for cleaning and efficiently utilizing coal, and the coal water slurry gasification technology is widely popularized and applied due to the advantages of large unit volume treatment capacity, high carbon conversion rate, high gasification strength, energy conservation, environmental protection and the like. The core equipment of the coal water slurry gasification technology is a burner, the performance and the service life of the burner directly influence the effective proceeding of the normal reaction in the gasification furnace, the quality of the gasification process product and the long-period stable operation thereof. However, the existing coal gasification burner still has the problems of poor mixing effect of oxygen and coal water slurry, easy damage and the like, and the coal gasification efficiency is low.
Therefore, the existing coal gasification burner is to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a coal gasification burner and a gasification furnace thereof, by which not only the mixing effect of oxygen and coal water slurry can be improved, thereby improving the gasification efficiency of coal water slurry, but also the service life of the coal gasification burner can be prolonged, and the coal gasification cost can be reduced.
The technical solution of the present application was completed based on the following findings: the main reasons for the easy damage of the burner were found to be as follows: firstly, the hearth contains a large amount of CO and H2And when the combustible gas is at high temperature, the combustible gas and oxygen are further combusted, a high-temperature area is formed at the head of the burner, and the burner can crack and damage when working at high temperature for a long time. On the other hand, the reducing gases have certain corrosion effect on the burner, and the service life of the burner is seriously influenced. Moreover, the flow of the coal water slurry is about the same as that of the oxygen, and in order to ensure that the flow of the coal water slurry is the same as that of the oxygen, the cross sectional area of the coal water slurry can be increased or the flow rate of the coal water slurry can be increased; if the cross-sectional area of the coal water slurry is increased, the mixing effect of the coal water slurry and the oxygen is poor. If the flow rate of the coal water slurry is increased, the coal water slurryThe slurry contains coal particles with higher concentration, and the increase of the flow rate of the coal water slurry by 10 percent can cause the wear rate of the burner to increase by 20 percent, thereby causing the service life of the burner to be greatly reduced. The inventor of this application aims at solving the defect among the prior art through actively exploring to current coal gasification nozzle, obtains having the effectual and long service life's of compounding coal gasification nozzle.
To this end, in one aspect of the invention, a coal gasification burner is provided. According to an embodiment of the invention, the coal gasification burner comprises:
an inner oxygen conduit;
the first pipeline is sleeved on the inner layer oxygen pipeline and forms an inner layer coal water slurry channel with the outer wall of the inner layer oxygen pipeline;
the second pipeline is sleeved on the first pipeline and forms an outer-layer oxygen channel with the outer wall of the first pipeline;
the third pipeline is sleeved on the second pipeline and forms an outer layer coal water slurry channel with the outer wall of the second pipeline;
and the cooling pipeline is arranged on the outer wall of the third pipeline.
According to the coal gasification burner disclosed by the embodiment of the invention, the first pipeline, the second pipeline and the third pipeline are sequentially sleeved on the inner-layer oxygen pipeline, the coal water slurry is supplied into the inner-layer coal water slurry channel formed between the first pipeline and the inner-layer oxygen pipeline, the oxygen is supplied into the outer-layer oxygen channel formed between the second pipeline and the first pipeline, the oxygen is injected into the inner-layer oxygen pipeline at a high speed, so that the coal water slurry sprayed out from the inner-layer coal water slurry channel forms the coal water slurry film, the oxygen supplied through the outer-layer oxygen channel can tear and atomize the coal water slurry film, the oxygen and the coal water slurry are fully mixed, and the coal gasification efficiency is improved. Meanwhile, the coal water slurry is supplied through an outer layer coal water slurry channel formed between the third pipeline and the second pipeline, on one hand, the coal water slurry supplied in the outer layer coal water slurry channel can play a role in wrapping oxygen in an outer layer oxygen channel, so that the shearing direction angle of the outer layer oxygen is maintained, and further the atomization capability of the outer layer oxygen on the coal water slurry film is enhanced; on the other hand, by simultaneously arranging the inner layer coal water slurry channel and the outer layer coal water slurry channel, a part of coal water slurry can be distributed into the outer layer coal water slurry channel, and the flow velocity of the inner layer coal water slurry pipeline is reduced, so that the abrasion of the coal water slurry to the inner layer coal water slurry channel is reduced, and the mixing effect of oxygen and the coal water slurry is improved; on the other hand, the coal water slurry sprayed out of the outer layer coal water slurry channel is equivalent to that a layer of heat insulation protective layer is added on the outer side of oxygen sprayed out of the outer layer oxygen channel, so that the working temperature of the burner head is reduced, a large amount of reducing gas in a hearth is prevented from being in direct contact with the oxygen, the burner is prevented from cracking due to a large amount of heat released by further combustion of the oxygen and the reducing gas, the service life of the burner is prolonged, the contact of the reducing gas with the end part of the burner is reduced, the corrosion of the reducing gas to the end part of the burner is reduced, and; in addition, the cooling pipeline is arranged on the outer wall of the third pipeline to cool the third pipeline, so that the hot corrosion of the combustion flue gas in the hearth to the third pipeline can be obviously reduced, and the service life of the burner is prolonged. Therefore, the coal gasification burner can improve the mixing effect of oxygen and coal water slurry, thereby improving the gasification efficiency of the coal water slurry, prolonging the service life of the coal gasification burner and reducing the coal gasification cost.
In addition, according to the coal gasification burner of the above embodiment of the present invention, the coal gasification burner may further have the following additional technical features:
in some embodiments of the invention, the ratio of the cross-sectional area of the inner oxygen conduit to the cross-sectional area of the outer oxygen conduit ranges from 1:4 to 1: 2. This can reduce the loss of the inner oxygen duct.
In other embodiments, the ratio of the cross-sectional area of the inner coal-water slurry channel to the cross-sectional area of the outer coal-water slurry channel is in the range of 5:1 to 7: 1. Therefore, the loss of the inner layer coal water slurry channel can be reduced, and the mixing effect of the coal water slurry and the oxygen is improved.
In other embodiments, the ratio of the cross section of the inner oxygen pipeline, the cross section of the inner coal-water slurry channel, the cross section of the outer oxygen pipeline and the cross section area of the outer coal-water slurry channel is (6-9): 5-7): 18-24): 1. Therefore, the mixing effect of the coal water slurry and the oxygen is improved.
In some other embodiments, the cooling duct includes: the cooling device comprises a first sub-cooling pipeline and a second sub-cooling pipeline, wherein the downstream end part of the first sub-cooling pipeline is communicated with the second sub-cooling pipeline. Therefore, the service life of the burner can be prolonged.
In some other embodiments, the first sub-cooling pipe is sleeved on the third pipe and forms a first cooling water channel with an outer wall of the third pipe; the second sub-cooling pipeline is sleeved on the first sub-cooling pipeline and forms a second cooling water channel with the outer wall of the first sub-cooling pipeline. Therefore, the service life of the burner can be prolonged.
In some other embodiments, at least one of the end downstream of the inner oxygen conduit, the end downstream of the first conduit, the end downstream of the second conduit, and the end downstream of the third conduit is coated with a reduction-resistant coating. Therefore, the service life of the burner can be prolonged.
In other embodiments, the reduction-resistant coating comprises at least one of tungsten carbide and ceramic. Therefore, the service life of the burner can be prolonged.
In other embodiments, the reduction-resistant coating thickness is 3 to 5 millimeters. Therefore, the service life of the burner can be prolonged.
In yet another aspect of the present invention, a gasifier is provided. According to an embodiment of the invention, the gasification furnace is provided with the coal gasification burner provided by any one of the embodiments. This can improve the efficiency of coal gasification in the gasification furnace.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic longitudinal sectional view of a coal gasification burner according to an embodiment of the present invention;
FIG. 2 is a schematic longitudinal sectional view of a coal gasification burner according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In one aspect of the invention, a coal gasification burner is provided. According to an embodiment of the invention, referring to fig. 1, the coal gasification burner comprises an inner oxygen conduit 100, a first conduit 200, a second conduit 300, a third conduit 400 and a cooling conduit 500.
According to an embodiment of the present invention, the inner oxygen duct 100 is used for outputting inner oxygen, and referring to fig. 1, the inner oxygen duct 100 includes an inner oxygen duct straight section 11 and an inner oxygen duct necking section 12 connected in sequence, i.e., the necking section 12 is formed at the downstream end of the inner oxygen duct 100, thereby increasing the speed of oxygen ejected through the inner oxygen duct 100.
According to the embodiment of the present invention, the first pipeline 200 is sleeved on the inner layer oxygen pipeline 100 and forms an inner layer coal-water slurry channel 21 with the outer wall of the inner layer oxygen pipeline 100, the inner layer coal-water slurry channel 21 is used for outputting inner layer coal-water slurry, referring to fig. 1, the first pipeline 200 comprises a first pipeline straight-tube section 22 and a first pipeline necking section 23 which are sequentially connected, that is, a first pipeline necking section 23 is formed at the downstream end of the first pipeline 200, so as to increase the speed of spraying the inner layer coal-water slurry through the inner layer coal-water slurry channel 21. According to an embodiment of the present invention, referring to fig. 1, a premixing space 24 is formed between the downstream end of the inner oxygen conduit 100 and the downstream end of the first conduit 200, so as to facilitate the inner oxygen conduit 100 to jet oxygen at a high speed, so that the coal water slurry jetted from the inner coal water slurry channel 21 forms a coal water slurry film, and facilitate the outer oxygen jetted from the second conduit 300 to tear and atomize the coal water slurry film. Preferably, the premixing space 24 is formed between the first conduit neck section 23 and the inner oxygen passageway neck section 12. According to a particular embodiment of the invention, the volume ratio of the premixing space 24 to the first pipe neck section 23 is between 1:4 and 1: 2. The inventor finds that when the proportion is too small, the premixing space is too small to buffer the oxygen flowing through the necking; when the proportion is too large, the premixing space is too large, the premixing time of the oxygen and the coal water slurry is prolonged, and the flow resistance is increased.
According to the embodiment of the invention, the second pipeline 300 is sleeved on the first pipeline 200 and forms an outer layer oxygen channel 31 with the outer wall of the first pipeline 200, and the outer layer oxygen channel 31 is used for outputting outer layer oxygen, so that the coal water slurry film can be torn and atomized by the oxygen supplied through the outer layer oxygen channel, the oxygen and the coal water slurry can be fully mixed, and the coal gasification efficiency can be improved. Referring to fig. 1, the second pipeline 300 includes a second pipeline straight-tube section 32 and a second pipeline necking section 33 connected in sequence, that is, the second pipeline necking section 33 is formed at the downstream end of the second pipeline 300, so as to increase the spraying speed of the outer oxygen, increase the shearing speed of the outer oxygen to the inner coal water slurry film, and be more beneficial to scattering the inner coal water slurry film. According to one embodiment of the present invention, the ratio of the cross-sectional area of the inner oxygen conduit 100 to the cross-sectional area of the outer oxygen passageway 31 ranges from 1:4 to 1: 2; the inventor finds that the over-high ratio can cause the outer layer oxygen flow to be too small, so that the atomization power is reduced, and the atomization effect is poor; the ratio is too low, which causes the dilution effect of the inner oxygen to the coal water slurry to be insufficient, the atomization resistance of the coal water slurry is increased, and the atomization effect is not ideal.
According to the embodiment of the present invention, the third pipe 400 is sleeved on the second pipe 300 and forms an outer layer coal-water slurry channel 41 with the outer wall of the second pipe 300, and the outer layer coal-water slurry channel 41 is used for outputting outer layer coal-water slurry. Referring to fig. 1, the third pipe 400 includes a third pipe straight section 42 and a third pipe necking section 43 connected in sequence, that is, the third pipe necking section 43 is formed at the downstream end of the third pipe 400, so as to increase the outer layer coal-water slurry spraying speed. The inventor finds that by supplying the coal water slurry into the outer layer coal water slurry channel 41 formed between the third pipeline 400 and the second pipeline 300, on one hand, the coal water slurry supplied into the outer layer coal water slurry channel 41 can play a role of wrapping the oxygen in the outer layer oxygen channel 31, so that the shearing direction angle of the outer layer oxygen is maintained, and the atomization capability of the outer layer oxygen on the coal water slurry film is enhanced; on the other hand, by arranging the inner layer coal water slurry channel 21 and the outer layer coal water slurry channel 41 at the same time, a part of coal water slurry can be distributed into the outer layer coal water slurry channel 41, and the flow rate of the coal water slurry in the inner layer coal water slurry channel 21 is reduced, so that the abrasion of the coal water slurry to the inner layer coal water slurry channel 21 is reduced, and the mixing effect of oxygen and the coal water slurry is improved; on the other hand, the coal slurry of outer coal slurry passageway 41 spun has increased the thermal-insulated protective layer of one deck in the outer oxygen outside of outer oxygen passageway 31 spun, has avoided a large amount of reducing gas and oxygen direct contact in the furnace, avoids oxygen and reducing gas further to burn release a large amount of heat and causes the nozzle to split, improves nozzle life, has reduced the contact of reducing gas and nozzle tip simultaneously, has reduced the corruption of reducing gas to the nozzle tip, improves nozzle life. According to a specific embodiment of the invention, the ratio of the cross section of the coal-water slurry channel at the inner layer to the cross section area of the coal-water slurry channel at the outer layer is 5:1 to 7: 1. The inventors have found that. The small proportion can cause the flow of the coal water slurry on the outer layer to be too large, isolate external high-temperature smoke and oxygen on the inner layer, and is not beneficial to the combustion of the coal water slurry; too large a proportion can cause too small a flow of the outer layer of the coal water slurry, and the protection effect cannot be achieved.
Furthermore, the ratio of the cross section of the inner oxygen pipeline 100, the cross section of the inner coal water slurry channel 21, the cross section of the outer oxygen channel 31 and the cross section of the outer coal water slurry channel 41 is (6-9): 5-7): 18-24): 1. The inventor finds that in this proportion scope, the coal slurry nozzle can play the guard action to the nozzle through outer coal slurry under the prerequisite of guaranteeing high-efficient atomizing, and skew this scope can lead to nozzle atomization effect variation can the protecting effect not enough.
According to an embodiment of the present invention, a cooling duct 500 is provided at an outer wall of the third duct 400. For example, the cooling water pipe may be wound around an outer wall of the third pipe, so that cooling water is supplied through the cooling water pipe to cool the burner, thereby improving the service life of the burner. Preferably, referring to fig. 1, the cooling pipe 500 may be sleeved on the third pipe 400 and form a cooling water channel 51 with the outer wall of the third pipe 400, so as to increase the contact area of the cooling water with the outer wall of the third pipe 400 and improve the cooling efficiency of the burner.
Further, referring to fig. 2, the cooling pipe 500 includes a first sub-cooling pipe 52 and a second sub-cooling pipe 53, a downstream end of the first sub-cooling pipe 52 is communicated with the second sub-cooling pipe 53, the first sub-cooling pipe 52 is used for inputting cooling water, the cooling water exchanges heat with the third pipe 400 to increase the temperature, the second sub-cooling pipe 53 is used for outputting the cooling water after increasing the temperature, so as to form a circulation, and the first sub-cooling pipe 52 can continuously input cooling water to sufficiently cool the burner. Preferably, the first sub-cooling pipe 52 is sleeved on the third pipe 400 and forms a first cooling water channel 521 with the outer wall of the third pipe 400; the second sub-cooling pipe 53 is sleeved on the first sub-cooling pipe 52 and forms a second cooling water channel 531 with the outer wall of the first sub-cooling pipe 52, the first cooling water channel 521 is used for inputting cooling water, and the second cooling water channel 531 is used for outputting cooling water.
According to the coal gasification burner of the embodiment of the invention, the first pipeline, the second pipeline and the third pipeline are sequentially sleeved on the inner layer oxygen pipeline, the coal water slurry is supplied into the inner layer coal water slurry channel formed between the first pipeline and the inner layer oxygen pipeline, the oxygen is supplied into the outer layer oxygen channel formed between the second pipeline and the first pipeline, the oxygen is injected at high speed by the inner layer oxygen pipeline, so that the coal water slurry sprayed out from the inner layer coal water slurry channel forms the coal water slurry film, the oxygen supplied by the outer layer oxygen channel can tear and atomize the coal water slurry film, the full mixing of the oxygen and the coal water slurry is realized, the coal gasification efficiency is improved, meanwhile, the coal water slurry is supplied into the outer layer channel formed between the third pipeline and the second pipeline, on one hand, the oxygen supplied in the outer layer channel can play a role of wrapping the oxygen in the outer layer oxygen channel, the shearing direction angle of the outer layer oxygen is maintained, so that the atomization capability of the outer layer oxygen to the coal water slurry film is enhanced, on the other hand, by simultaneously arranging the inner layer coal water slurry channel and the outer layer coal water slurry channel, can distribute a part of coal water slurry into the outer layer coal water slurry channel, reduce the flow rate of the inner layer coal water slurry pipeline, thereby reducing the abrasion of the coal water slurry to the inner layer coal water slurry channel, simultaneously improving the mixing effect of the oxygen and the coal water slurry, on the other hand, the coal water slurry sprayed out of the outer layer coal water slurry channel is equivalent to that a layer of heat insulation protective layer is added outside the oxygen sprayed out of the outer layer oxygen channel, avoiding the direct contact of a large amount of reducing gas and the oxygen in the hearth, thereby reducing the working temperature of the head of the burner, simultaneously reducing the contact between the reducing gas and the end of the burner, reducing the corrosion of the reducing gas to the end of the burner and prolonging the service life of the burner; in addition, the cooling pipeline is arranged on the outer wall of the third pipeline to cool the third pipeline, so that the hot corrosion of the combustion flue gas in the hearth to the third pipeline can be obviously reduced, and the service life of the burner is prolonged. Therefore, the coal gasification burner can improve the mixing effect of oxygen and coal water slurry, thereby improving the gasification efficiency of the coal water slurry, prolonging the service life of the coal gasification burner and reducing the coal gasification cost.
In a second aspect of the present invention, a gasifier is presented. According to an embodiment of the invention, the gasification furnace is provided with the coal gasification burner provided by any one of the embodiments. This can improve the efficiency of coal gasification in the gasification furnace. It should be noted that the features and advantages described above for the coal gasification burner are also applicable to the gasifier and are not described herein again.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A coal gasification burner comprising:
an inner oxygen conduit;
the first pipeline is sleeved on the inner layer oxygen pipeline and forms an inner layer coal water slurry channel with the outer wall of the inner layer oxygen pipeline;
the second pipeline is sleeved on the first pipeline and forms an outer-layer oxygen channel with the outer wall of the first pipeline;
the third pipeline is sleeved on the second pipeline and forms an outer layer coal water slurry channel with the outer wall of the second pipeline;
and the cooling pipeline is arranged on the outer wall of the third pipeline.
2. The coal gasification burner of claim 1, wherein the ratio of the cross-sectional area of the inner oxygen conduit to the cross-sectional area of the outer oxygen channel ranges from 1:4 to 1: 2;
the ratio of the cross section of the inner layer coal-water slurry channel to the cross section of the outer layer coal-water slurry channel is 5:1 to 7: 1.
3. A coal gasification burner according to claim 1 or 2, wherein a premixing space is formed between the downstream end portion of the inner oxygen conduit and the downstream end portion of the first conduit.
4. The coal gasification burner nozzle according to claim 1 or 2, wherein the ratio of the cross section of the inner layer oxygen pipeline, the cross section of the inner layer coal water slurry channel, the cross section of the outer layer oxygen pipeline and the cross section area of the outer layer coal water slurry channel is (6-9): 5-7): 18-24): 1.
5. A coal gasification burner according to claim 1 or 2, wherein the cooling conduit comprises: the cooling device comprises a first sub-cooling pipeline and a second sub-cooling pipeline, wherein the downstream end part of the first sub-cooling pipeline is communicated with the second sub-cooling pipeline.
6. The coal gasification burner of claim 5, wherein the first sub-cooling pipe is sleeved on the third pipe and forms a first cooling water channel with the outer wall of the third pipe;
the second sub-cooling pipeline is sleeved on the first sub-cooling pipeline and forms a second cooling water channel with the outer wall of the first sub-cooling pipeline.
7. The coal gasification burner of claim 1 or 2, wherein at least one of the end downstream of the inner oxygen conduit, the end downstream of the first conduit, the end downstream of the second conduit, and the end downstream of the third conduit is coated with a reduction-resistant coating.
8. The coal gasification burner of claim 7, wherein the reduction-resistant coating comprises at least one of tungsten carbide and ceramic.
9. The coal gasification burner of claim 7, wherein the reduction-resistant coating thickness is 3-5 mm.
10. A gasification furnace characterized in that the gasification furnace is provided with the coal gasification burner according to any one of claims 1 to 9.
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