CN114151804A - Tail gas treatment combustor of power generation system - Google Patents
Tail gas treatment combustor of power generation system Download PDFInfo
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- CN114151804A CN114151804A CN202010934409.6A CN202010934409A CN114151804A CN 114151804 A CN114151804 A CN 114151804A CN 202010934409 A CN202010934409 A CN 202010934409A CN 114151804 A CN114151804 A CN 114151804A
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- 238000010248 power generation Methods 0.000 title claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 121
- 238000002485 combustion reaction Methods 0.000 claims abstract description 67
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000001301 oxygen Substances 0.000 claims abstract description 39
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 39
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003546 flue gas Substances 0.000 claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000446 fuel Substances 0.000 claims abstract description 16
- 238000009826 distribution Methods 0.000 claims description 33
- 238000001816 cooling Methods 0.000 claims description 24
- 239000002737 fuel gas Substances 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 230000001154 acute effect Effects 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 229910001882 dioxygen Inorganic materials 0.000 abstract description 10
- 238000002156 mixing Methods 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 8
- 235000017491 Bambusa tulda Nutrition 0.000 description 8
- 241001330002 Bambuseae Species 0.000 description 8
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 8
- 239000011425 bamboo Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
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- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
-
- 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
- Y02E20/32—Direct CO2 mitigation
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Environmental & Geological Engineering (AREA)
Abstract
The invention discloses a tail gas treatment burner of a power generation system, which comprises a flame tube (100); an anode inlet pipe (200) as a heat exchanger extending into the flame tube (100); and the combustion assembly (300) comprises a combustion seat (301) positioned at the bottom of the cylinder cavity of the flame cylinder (100), and an oxygen inlet pipe (302) and an anode tail gas inlet pipe (303) which are connected with the combustion seat (301). The invention adopts an assembly form of a flame tube, an anode gas inlet pipe and a combustion assembly, wherein the oxygen gas inlet pipe is a combustion improver pure oxygen inlet pipeline, the anode tail gas inlet pipe is a fuel pipeline, and the pure oxygen is used for supporting combustion by swirl mixing combustion of a combustion seat, so that impurities are prevented from being introduced, and the enrichment of CO2 tail gas is promoted. The generated flue gas and the anode gas inlet pipe perform pure heat exchange type heat exchange, so that system pressure fluctuation is avoided, and the heat utilization rate is improved.
Description
Technical Field
The invention belongs to the field of tail gas treatment burners.
Background
For gas-fired power SOFC systems, unreacted combustible and contaminant gases, such as CH, are present in the anode tail gas4CO, etc. In the system circulation PID, under the running state, a tail gas combustor is adopted, the combustible gas in the tail gas is combusted by using excess air, the pollutant emission is ensured to reach the standard, and the main component after the tail gas is combusted is H2O and CO2. The heat generated by the combustor is used for heating cathode intake air (such as air) by utilizing a radiation heat exchanger, a plate heat exchanger and the like, or is provided for the reformer, and the waste heat is utilized to improve the thermal efficiency of the system.
However, the tail gas emission of the existing system contains a large amount of CO2Aggravate the atmospheric greenhouse effect, and adopt air as combustion improver, will introduce N2Impurities affecting CO2Enrichment efficiency, NO in tail gas treatmentxDischarge relativelyLarge, it may cause acid corrosion of the pipeline at the tail of the system, affecting the safety.
In addition, for a synthesis gas IGFC system, the heat value of the synthesis gas is low, the flow difference between a cathode and an anode is large, the effect of heating the cathode by waste heat is not obvious enough, and the flue gas is directly injected into the exhaust tail part of the cathode, so that the back pressure fluctuation of the system is easily caused.
Disclosure of Invention
In view of the above-mentioned drawbacks or disadvantages of the prior art, the present invention provides an exhaust gas treatment burner for a power generation system, which can implement CO2Enrichment and high heat utilization rate.
To achieve the above object, the present invention provides an exhaust gas treatment burner of a power generation system, the exhaust gas treatment burner comprising:
a flame tube; the anode air inlet pipe is used as a heat exchanger and extends into the flame tube; and
the combustion assembly comprises a combustion seat positioned at the bottom of the cylinder cavity of the flame tube, and an oxygen inlet pipe and an anode tail gas inlet pipe which are connected with the combustion seat.
In some embodiments, the oxygen intake conduit is connected to a pure oxygen supply conduit or an oxygen generator.
In some embodiments, the anode inlet pipe comprises:
the axial extension section extends downwards into the flame tube;
the axial extension section extends out of the flame tube upwards; and
and the snake-shaped coil pipe section is connected between the axial extending-in section and the axial extending-out section and is coiled along the peripheral surface in the cylinder cavity of the flame cylinder.
In some embodiments, the serpentine coil section has a serpentine circumferential surface that is radially spaced parallel to an inner wall surface of the liner.
In some embodiments, the serpentine coil section comprises:
a plurality of straight coil pipes extending in an axial direction and being spaced apart from each other in parallel in a circumferential direction; and
and the arc-shaped coil pipe is connected between the pipe ends of the adjacent straight pipe sections.
In some embodiments, the combustion assembly is configured such that combustion flue gases spiral within the barrel cavity of the flame tube.
In some embodiments, the combustion assembly comprises:
the oxygen air distribution plate is provided with a central mounting hole and a plurality of air distribution holes, and the plurality of air distribution holes are sequentially distributed at intervals along the circumferential direction and form a ring shape surrounding the central mounting hole;
the combustion seat is embedded in the central mounting hole and comprises a plurality of gas holes, and the plurality of gas holes are sequentially distributed at intervals along the circumferential direction to form a hole ring; and
the flame stabilizing expander is in a conical cylinder shape with an upward flaring and is arranged on the oxygen air distribution plate around the air distribution hole;
and the oxygen airflow passing through the air distribution holes and the fuel gas airflow passing through the fuel gas holes generate mixed combustion in the flame-stabilizing expander.
In some embodiments, the air distribution hole and the gas hole are swirl holes with hole axes inclined towards the same circumferential direction to form a same-direction swirl, and the hole axes of the swirl holes are inclined upwards and outwards towards the inner wall surface of the flame holder expander.
In some embodiments, the acute angle included angle between the hole axis of the air distribution hole and the horizontal plane is not equal to the acute angle included angle between the hole axis of the gas hole and the horizontal plane.
In some embodiments, a forced cooling shell is sleeved at the radial outer end of the flame tube, the forced cooling shell is used for cooling the wall of the flame tube, and an ignition hole extending out of the forced cooling shell is arranged at the radial outer end of the flame tube and close to the combustion seat.
In the tail gas treatment burner, a flame tube, an anode gas inlet pipe and a combustion assembly are assembled, the oxygen gas inlet pipe is a combustion improver pure oxygen inlet pipeline, the anode tail gas inlet pipe is a fuel pipeline, and the pure oxygen is used for combustion supporting through swirl mixed combustion of a combustion seat, so that impurities are prevented from being introduced, and CO is promoted2And (4) enriching. Pure heat exchange type exchange between generated flue gas and anode inlet pipeAnd the system pressure fluctuation is avoided, and the heat utilization rate is improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a perspective view of an exhaust treatment burner according to an embodiment of the present invention;
FIG. 2 is an exploded view of FIG. 1 showing an anode inlet tube and burner assembly, etc. within the liner;
FIG. 3 is a front view of FIG. 1;
FIG. 4 is an overall cross-sectional view of FIG. 3, showing the internal structure of the tail gas treatment burner;
FIGS. 5 and 6 are top views of the tail gas treatment burner of FIG. 3, respectively, with parts of the components omitted for clarity of illustration, with FIG. 5 particularly illustrating the liner and internal anode inlet tube, oxygen distribution plate, fuel swozzle, and flame holder expander, etc., and FIG. 6 further illustrating only the oxygen distribution plate, fuel swozzle, and flame holder expander;
FIG. 7 is a cross-sectional view taken along section A-A of FIG. 6;
FIG. 8 is a perspective view of the anode inlet manifold shown in FIG. 1 from a different perspective;
FIG. 9 is a perspective view of the fuel swozzle shown in FIG. 1 at a different perspective;
FIG. 10 is a perspective view of the gas port shown in FIG. 9 from a top view; and
fig. 11 is a schematic diagram of the operation of the tail gas treatment burner shown in fig. 1.
Description of reference numerals:
100 flame tube 200 anode inlet pipe
201 axial extension section 202 axial extension section
203S-shaped coil pipe section 2031 straight coil pipe
2032 arc coil 300 combustion assembly
301 burning seat 3011 oxygen air distribution plate
3012 flame-stabilizing spreader for fuel swirl nozzle 3013
302 oxygen inlet pipe 303 anode tail gas inlet pipe
1 air distribution hole and 2 gas holes
3 forced cooling of the ignition hole of the housing 4
A oxygen inlet and B anode tail gas inlet
C1 Cooling air Inlet C2 Cooling air Outlet
Hole axis of OO' gas hole
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention will be described in detail below with reference to exemplary embodiments and with reference to the accompanying drawings.
The present invention provides an exhaust gas treatment burner of a power generation system, referring to the embodiments of fig. 1 to 11, the exhaust gas treatment burner comprising:
an outer flame tube 100;
an anode inlet pipe 200 at the upper part of the inner cavity of the flame tube 100, referring to fig. 4 and 5, the anode inlet pipe 200 as a heat exchanger extends into the flame tube 100; and
the lower combustion assembly 300 comprises a combustion base 301 located at the bottom of the barrel cavity of the flame barrel 100, and an oxygen inlet pipe 302 and an anode tail gas inlet pipe 303 connected with the combustion base 301, see fig. 4 and 6.
The invention aims to provide a tail gas treatment combustor for anode tail gas of an SOFC (solid oxide fuel cell) system to solve the problem of CO (carbon monoxide) of the anode tail gas2Enrichment and the improvement of the heat utilization rate thereof. Due to the presence of unreacted combustible gases and contaminant gases, such as CH, in the anode tail gas in fuel gas power SOFC systems4CO, etc., the anode tail gas needs to be further treated by a tail gas treatment burner, and heat energy is released and CO is generated in the combustion process2The combustion products are equal, so the energy utilization problem and the tail gas emission reduction problem in the tail gas treatment process need to be fully considered, the heat energy utilization rate is improved, and CO is treated2The solidification and enrichment are carried out, and an environment-friendly production process with high utilization rate and low tail gas emission is formed as much as possible.
In this embodiment, a CO is provided for a power generation SOFC system2The structure design form of the trapped tail gas treatment burner. The oxygen inlet pipe 302 and the anode tail gas inlet pipe 303 at the lower part of the flame tube 100 are respectively a pure oxygen inlet pipeline and an anode tail gas inlet pipeline, and are combined with the combustion seat 201 at the bottom of the cavity of the flame tube 100 to form the combustion assembly 300, further, the anode inlet pipe 200 is used as a heat exchanger and extends into the combustion flue gas outlet of the flame tube 100 in a coil shape, but is not limited thereto, as shown in fig. 4 and 11.
As shown in the figure, pure oxygen of combustion-supporting gas enters the oxygen inlet pipe 302 along the oxygen inlet a, anode tail gas of fuel gas enters the anode tail gas inlet pipe 303 along the anode tail gas inlet B, fuel gas and combustion-supporting gas are mixed and combusted in a swirling manner at the combustion base 301, wherein the combustion-supporting gas is pure oxygen, and introduction of N is avoided2Equal impurities, CO for combustion flue gas2Trapping provides a prerequisite; further, the high-temperature flue gas generated by combustion rises to the upper part of the flame tube 100 in a swirling manner, the combustion flue gas is positioned in the flame tube 100, the anode inlet gas is positioned in the anode inlet pipe 200, and the anode inlet gas perform pure heat exchange type heat exchange instead of material exchange type heat exchange, so that no new gas component is introduced into the combustion flue gas, and CO in the combustion tail gas is ensured2Concentration of CO to further achieve combustion of the flue gas2Trapping provides advantageous conditions.
In this embodiment, the oxygen inlet pipe 302 is connected to a pure oxygen supply pipe or an oxygen generator. The pure oxygen gas supply pipe or the oxygen generator is used for providing or producing pure oxygen, the pure oxygen gas is introduced into the oxygen gas inlet pipe 302, the pure oxygen gas is used as a combustion improver, meanwhile, only oxygen is introduced into the tail gas treatment burner, the oxygen is used as one of essential elements of anode tail gas, the production concept that new impurities are not introduced in the industrial production process is highly matched, and it needs to be noted that the gas inlet end of the oxygen gas inlet pipe 302 is not limited to the pure oxygen gas supply pipe or the oxygen generator, and only the pure oxygen gas can be introduced into the oxygen gas inlet pipe 302.
Meanwhile, as shown in fig. 4 and 8, the anode intake pipe 200 includes: an axial insertion section 201 which extends downwards into the flame tube 100; an axial extension section 202 extending upwards out of the flame tube 100; and a serpentine coil section 203 connected between the axially extending section 201 and the axially extending section 202 and circumferentially coiled within the barrel cavity of the flame barrel 100. The anode intake pipe 200 is composed of three parts, wherein the axial stretches into the input that section 201 admits air for the anode, the axial stretches out the output that end 202 admits air for the anode, the anode admits air and flows in the same place in snakelike coil pipe section 203, make the anode admit air along flame tube 100 axial flow and be close to flame tube 100 section of thick bamboo wall global, realize that the mobile anode admits air and carry out simple heat exchange formula heat transfer with whirl dish liter burning gas, reduce the heat loss that the direct cooling of flue gas caused promptly, improve heat exchange efficiency, prevent the two material exchange again, avoid system's pressure fluctuation, meanwhile, snakelike coil pipe section 203 presses close to the flame tube section of thick bamboo wall, control flame tube section of thick bamboo wall temperature, and reduce the heat loss that directly leads to the fact to section of thick bamboo wall cooling, avoid high temperature flue gas directly to erode the section of thick bamboo wall simultaneously, protect the section of thick bamboo wall, improve the life of flame tube.
More specifically, as an example, the convoluted circumference of serpentine coil segment 203 is spaced radially parallel to the inner wall surface of liner 100, as shown in FIG. 5. The anode inlet air uniformly flows through the wall of the flame tube 100, and the temperature of the wall of the flame tube 100 is uniformly controlled. Wherein serpentine coil section 203 comprises: a plurality of straight coil pipes 2031 extending axially and spaced apart from and parallel to each other in the circumferential direction; and an arc-shaped coil 2032 connected between the ends of adjacent straight coils 2031, as shown in fig. 8. The straight coil 2031 ensures that the anode intake air flows along the axial direction of the liner 100, and the arc coil 2032 reduces the anode intake air flow resistance and the impact on the coil, so as to realize smooth flow of the anode intake air.
As shown in fig. 4, 6 and 7, the combustion assembly 300 is configured to make the combustion flue gas spirally rise in the cylindrical cavity of the flame tube 100, wherein the combustion flue gas spirally rises along the cylindrical cavity and is perpendicular to the flow direction of the anode inlet air in the anode inlet pipe 200, so as to ensure that the high-temperature flue gas vertically sweeps across the heat exchange surface by multiple rotational flows, and heat convection and radiant heat are fully utilized to heat the inner anode inlet air, thereby improving the thermal efficiency of the system.
The tail gas treatment burner of the existing power generation SOFC system mostly adopts air as a combustion improver, and combusts combustible gas in the anode tail gas by using excessive air to ensure CO and NOxThe exhaust gas reaches the standard, and the main component of the tail gas after combustion is H2O and CO2(ii) a Meanwhile, the heat generated by the combustor is mixed with the cathode outlet gas by utilizing equipment such as a radiation heat exchanger, a plate heat exchanger and the like, the cathode inlet gas is heated by the heat exchanger or is supplied to a reformer, and the waste heat is utilized, so that the heat efficiency of the system is improved.
Wherein, air is used as a tail gas combustion improver, and a large amount of N is introduced2Cause NOxPollutant discharge and air pollution simultaneously affect CO2The enrichment efficiency of (2) can even cause acid corrosion of the tail system, which affects the safety; meanwhile, for a synthesis gas IGFC system, the heat value of the synthesis gas is low, the difference between the cathode flow and the anode flow is large, the cathode flow is 10-15 times of the anode flow under typical working conditions, the effect of heating the cathode by waste heat is not obvious enough, and flue gas is directly injected into the exhaust tail of the cathode, so that the fluctuation of the back pressure of the system is easily caused.
Specifically, in the present embodiment, as shown in fig. 6 and 7, the combustion holder 301 includes: the oxygen air distribution plate 3011 is provided with a central mounting hole and a plurality of air distribution holes 1, and the plurality of air distribution holes 1 are sequentially arranged at intervals along the circumferential direction to form a ring shape surrounding the central mounting hole. Wherein the pure oxygen that oxygen intake pipe 302 lets in gets into in the flame tube 100 through a plurality of wind distribution holes 1, according to the operation requirement, when near the burning of equivalent weight, the pure oxygen airflow is less, guarantees the oxygen airflow velocity of flow through wind distribution hole 1 to this strengthens flame swirl strength, guarantees the mixing effect, and in addition, low temperature oxygen flows through and when cooling oxygen wind distribution plate 3011 and steady flame expander 3013, guarantees that the welding seam temperature is within the acceptable range. The fuel swirler 3012 located at the center of the bottom of the flame tube 100 is embedded in the central mounting hole and includes a plurality of gas holes 2, and the plurality of gas holes 2 are sequentially arranged at intervals along the circumferential direction to form a hole ring shape, as shown in fig. 7, 9 and 10. Wherein the top circular plane of the fuel swirler 3012 forms a blunt body structure and the inside is a conical surface structure, but not limited thereto, the gas hole 2 shown in fig. 7 at the section a-a is only a partial structure of the hole.
The fuel swirl nozzle 3012 and the anode tail gas inlet pipe 303 can be connected through threads on the inner side of the fuel swirl nozzle 3012, but not limited thereto, the anode tail gas inlet pipe 303 is introduced with the anode tail gas, and enters the flame tube 100 along the plurality of gas holes 2 to be mixed with the combustion improver pure oxygen; the flame stabilizing expander 3013 is in a conical cylinder shape with an upward flaring and is arranged on the oxygen air distribution plate 3011 around the air distribution hole 1; the flame stabilizing expander 3013 is concentric with the oxygen air distribution plate 3011 and the fuel swirl nozzle 3012, wherein, the oxygen air flow passing through the air distribution holes 1 and the gas air flow passing through the gas holes 2 generate mixed combustion in the flame stabilizing expander 3013, the mixed air flow collides with the inner wall surface of the flame stabilizing expander 3013 when flowing, because the flowing direction of the mixed air flow forms a certain angle with the vertical direction and the action of the nozzle bluff body structure, a low-pressure area is formed in the middle of the burner, the mixed air flow flows to the entrainment backflow direction, the fume entrainment backflow strength is enhanced, the stability and the mixing effect of the flame root are enhanced, the flame stabilizing and swirl mechanism adopted in the flame tube 100 improves the stability of the combustion of anode tail gas (low heat value and large moisture content) and controls the flame length.
As shown in fig. 7 and 10, the air distribution holes 1 and the gas holes 2 are swirl holes having hole axes inclined toward the same circumferential direction to form a swirl flow in the same direction, and the hole axes of the swirl holes extend obliquely upward and outward toward the inner wall surface of the flame holder 3013 as shown by the hole axes OO' of the gas holes 2 in fig. 7. The axes of the air distribution holes 1 and the gas holes 2 form a certain rotational flow angle with the horizontal plane, oxygen and gas rotate counterclockwise in the same direction, and furthermore, the acute angle included angle between the hole axis of the air distribution holes 1 and the horizontal plane is not equal to the acute angle included angle between the hole axis of the gas holes 2 and the horizontal plane. According to the rotational flow arrangement mode, anode tail gas and pure oxygen are converged in the flame stabilizing expander 3013, combustion airflow can be decomposed into two directions of flow, one is a backflow direction, namely, the airflow is reflected and reflows at the central position of a combustion area, the other is a rotational flow direction, the combustion airflow forms a strong, for example, anticlockwise rotational flow, the spiral lifting of the flue gas is perpendicular to the flow direction of inlet air of the anode, the high-temperature flue gas is enabled to vertically sweep across a heat exchange surface through multiple rotational flows, the inner anode inlet air is heated by fully utilizing heat convection and radiant heat, and the heat efficiency of the system is improved. Meanwhile, a low-pressure backflow area is formed in the center of the flame, high-temperature flue gas is sucked to the root of the flame in a winding mode, flue gas backflow is achieved, the mixing effect of fuel and oxygen is improved, the temperature of the root of the flame is improved, a strong flame stabilizing effect is formed, and stable combustion of anode tail gas with ultralow heat value is guaranteed.
As shown in fig. 2 and 4, the radial outer end of the flame tube 100 is sleeved with a forced cooling shell 3, the forced cooling shell 3 is used for cooling the wall of the flame tube 100, wherein cooling air enters the forced cooling shell 3 along a cooling air inlet C1 and is discharged along a cooling air outlet C2, the cooling air flows from bottom to top, the cooling effect is improved, the wall of the flame tube 100 is effectively protected, the service life is prolonged, the radial outer end of the flame tube 100 and the position close to the combustion base 301 are provided with an ignition hole 4 extending out of the forced cooling shell 3, and the ignition hole 4 is used for igniting and combusting fuel gas and combustion-supporting gas in the flame tube 100.
The system tail gas composition in the power generation SOFC system of the invention can change along with the output load, the fuel utilization rate and the fuel composition of the power generation module. Furthermore, aiming at the variable load characteristic of the output power of the system, CFD simulation calculation of the tail gas combustion process of the 10 kW-level and 5 kW-level systems is carried out.
In four specific examples shown in tables one to four below, the results of experiments conducted with syngas of different compositions as fuel gas introduced into power generation systems of different output loads are shown in the following tables, wherein the flow rate units are all SLPM. Gas cylinder gas mixing is used for simulating tail gas components, a water bath device is introduced after mixing, and the water content in the mixed gas is controlled through the water bath temperature, so that the tail gas simulation of different components is completed.
The results show that: the tail gas treatment combustor for the anode tail gas of the SOFC system provided by the invention can normally work under different output power load conditions, and the treated flue gas is dry-based CO2The concentration is higher than 95 percent, and the CO is obviously improved2And (4) enrichment rate.
In summary, in the tail gas treatment burner of the present invention, pure oxygen is used as the combustion improver and introduced into the oxygen inlet pipe 302, so as to avoid introducing N2Etc. and reduce NOxEmission of CO to achieve combustion of flue gases2The entrapment provides the prerequisite, and further, adopt the anode intake pipe 200, make the anode admit air flow along the flame tube 100 axial and be close to the flame tube 100 section of thick bamboo wall global, the protection section of thick bamboo wall promotes life, and the anode admit air carries out simple heat exchange formula heat transfer with burning tail gas, and the heat exchange of non-matter exchange formula avoids system's pressure fluctuation, effectively improves the heat utilization ratio, simultaneously, does not introduce new gas composition in the burning flue gas, guarantees to burn CO in the tail gas2Concentration of CO to further achieve combustion of the flue gas2Trapping provides a beneficial safeguard.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical spirit of the present 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 devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore 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; may be mechanically coupled, may be electrically coupled or may be in communication with each other; 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 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. An exhaust treatment burner for a power generation system, the exhaust treatment burner comprising:
a flame tube (100); an anode inlet pipe (200) as a heat exchanger extending into the flame tube (100); and
the combustion assembly (300) comprises a combustion seat (301) positioned at the bottom of the cylinder cavity of the flame cylinder (100), and an oxygen inlet pipe (302) and an anode tail gas inlet pipe (303) which are connected with the combustion seat (301).
2. The exhaust gas treatment burner according to claim 1, wherein the oxygen inlet pipe (200) is connected to a pure oxygen supply pipe or an oxygen generator.
3. The exhaust gas treatment burner according to claim 1, wherein the anode inlet pipe (200) comprises:
an axial insertion section (201) which extends downwards into the flame tube (100);
an axial extension section (202) extending upwards out of the flame tube (100); and
the snakelike coil pipe section (203) is connected between the axial extending section (201) and the axial extending section (202) and is coiled along the peripheral surface in the cylinder cavity of the flame cylinder (100).
4. The exhaust gas treatment burner of claim 3, wherein the serpentine coil section (203) has a circumferential periphery that is radially spaced parallel to an inner wall surface of the liner (100).
5. The exhaust gas treatment burner according to claim 3, wherein the serpentine coil section (203) comprises:
a plurality of straight coils (2031) extending axially and circumferentially spaced apart from and parallel to each other; and
and the arc-shaped coil pipes (2032) are connected between the pipe ends of the adjacent straight coil pipes (2031).
6. The exhaust gas treatment burner according to any one of claims 1 to 5, wherein the combustion assembly (300) is configured such that combustion flue gas spirally coils in a barrel cavity of the flame barrel (100).
7. The exhaust gas treatment burner according to claim 6, wherein the combustion seat (301) comprises:
the oxygen air distribution plate (3011) is provided with a central mounting hole and a plurality of air distribution holes (1), and the air distribution holes (1) are sequentially distributed at intervals along the circumferential direction to form a ring shape surrounding the central mounting hole;
the fuel swirl nozzle (3012) is embedded in the central mounting hole and comprises a plurality of fuel gas holes (2), and the plurality of fuel gas holes (2) are sequentially arranged in a hole ring shape at intervals along the circumferential direction; and
the flame stabilizing expander (3013) is in a conical cylinder shape with an upward flaring and is arranged on the oxygen air distribution plate (3011) around the air distribution hole (1);
and mixed combustion is generated in the flame-stabilizing expander (3013) by the oxygen airflow passing through the air distribution holes (1) and the fuel gas airflow passing through the fuel gas holes (2).
8. The tail gas treatment burner as claimed in claim 7, wherein the air distribution hole (1) and the gas hole (2) are swirl holes with hole axes inclined towards the same circumferential direction to form a same-direction swirl flow, and the hole axes of the swirl holes are inclined upwards and outwards towards the inner wall surface of the flame-stabilizing expander (3013).
9. The exhaust gas treatment burner according to claim 8, wherein the acute angle between the hole axis of the air distribution hole (1) and the horizontal plane is not equal to the acute angle between the hole axis of the gas hole (2) and the horizontal plane.
10. The tail gas treatment burner according to claim 1, wherein a forced cooling shell (3) is sleeved at a radial outer end of the flame tube (100), the forced cooling shell (3) is used for cooling the wall of the flame tube (100), and an ignition hole (4) extending out of the forced cooling shell (3) is arranged at the radial outer end of the flame tube (100) and close to the combustion seat (301).
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| CN114151804B (en) | 2023-12-01 |
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